CN116017822A - Drive plate assembly suitable for track lamp - Google Patents

Abstract

The invention relates to the technical field of lighting lamp control, and provides a driving board assembly suitable for a track lamp, which comprises a rectification voltage-reducing circuit, a rectification power switch circuit, an infrared sensing device, an MCU control unit and a control switch circuit, wherein the input end of the rectification voltage-reducing circuit is used for being connected with mains supply, the input end of the rectification power switch circuit is electrically connected with the output end of the rectification voltage-reducing circuit so as to convert low-voltage alternating current output by the rectification voltage-reducing circuit into low-voltage direct current, and the output end of the rectification power switch circuit is electrically connected with the MCU control unit so as to supply power for the MCU control unit; the signal end of the MCU control unit is electrically connected with the infrared sensing device, and the MCU control unit is connected with the track lamp through the control switch circuit; the invention can automatically control the on or off of the track lamp according to the approach or the separation of the user from the illumination area, thereby effectively improving the experience of the user and avoiding forgetting to turn off the track lamp because the user does not need to manually control.

Description

Drive plate assembly suitable for track lamp

Technical Field

The invention relates to the technical field of lighting lamp control, in particular to a driving plate assembly suitable for a track lamp.

Background

The track lamp is generally applied to indoor bedrooms, living rooms, kitchens and the like of daily households, however, the existing track lamp is mainly manually controlled through a switch, for example, when a user enters a room, the user operates the switch mounted on a wall to turn on the track lamp, when the user leaves the room, the switch is operated again to turn off the track lamp, so that the manual control of the indoor track lamp is realized, but the switching mode of the track lamp requires manual operation of the user every time, particularly when the lamp is turned on or off at night, the user cannot easily check the indoor environment, so that the user experience is poor, and sometimes the condition that the user forgets to turn off the track lamp also occurs.

Disclosure of Invention

The invention solves the problem of how to automatically control the switch of the track lamp and improve the user experience.

In order to solve the problems, the invention provides a driving board assembly suitable for a track lamp, which comprises a rectification voltage-reducing circuit, a rectification power switch circuit, an infrared sensing device, an MCU control unit and a control switch circuit, wherein the input end of the rectification voltage-reducing circuit is used for being connected with mains supply, the input end of the rectification power switch circuit is electrically connected with the output end of the rectification voltage-reducing circuit so as to convert low-voltage alternating current output by the rectification voltage-reducing circuit into low-voltage direct current, and the output end of the rectification power switch circuit is electrically connected with the MCU control unit so as to supply power for the MCU control unit; the signal end of the MCU control unit is electrically connected with the infrared sensing device to acquire information of approaching or separating of people detected by the infrared sensing device, and the MCU control unit is connected with the track lamp through the control switch circuit to control the on-off of the control switch circuit to switch the track lamp.

Optionally, the control switch circuit includes a first switch tube and a protection capacitor, the control end of the MCU control unit is connected with the grid electrode of the first switch tube, the source electrode and the drain electrode of the first switch tube are respectively connected with one end of the rectifying power switch circuit and the track lamp, and the protection capacitor is connected in parallel with the source electrode and the drain electrode of the first switch tube.

Optionally, the control switch circuit further comprises a current limiting resistor circuit, and the current limiting resistor circuit is connected in series between the control end of the MCU control unit and the gate of the first switch tube.

Optionally, the rectifying power switch circuit includes a synchronous rectifier and a current limiting circuit, an output end of the synchronous rectifier is connected with an input end of the current limiting circuit, and an output end of the current limiting circuit is electrically connected with the MCU control unit and the track lamp respectively.

Optionally, the rectifying power switch circuit further includes a buck capacitor and a first current limiting resistor, where the buck capacitor and the first current limiting resistor are connected in series and in parallel to a power supply terminal of the synchronous rectifier.

Optionally, the rectifying and voltage reducing circuit includes a rectifying bridge, a step-down transformer, a starting circuit, a switching power supply chip and an input voltage detecting circuit, where an input end of the rectifying bridge is used to connect with a mains supply, the step-down transformer includes a first primary winding, a second primary winding and a secondary winding coupled with the first primary winding, an output end of the rectifying bridge is electrically connected with the first primary winding, the secondary winding is electrically connected with an output end of the rectifying power switching circuit, and an output end of the rectifying bridge is electrically connected with a power supply end of the switching power supply chip through the starting circuit; the input end and the output end of the input voltage detection circuit are respectively and electrically connected with the second primary winding and the acquisition end of the switching power supply chip, and the control end of the switching power supply chip is electrically connected with the first primary winding.

Optionally, the rectifying and voltage-reducing circuit further comprises an absorption circuit, and the absorption circuit is electrically connected with the output end of the rectifying bridge and the first primary winding respectively.

Optionally, the rectifying and voltage-reducing circuit further includes a rectifying diode and a second current-limiting resistor, an output end of the second primary winding is connected with an anode of the rectifying diode, and a cathode of the rectifying diode is electrically connected with a power end of the switching power supply chip through the second current-limiting resistor.

Optionally, the rectifying and voltage-reducing circuit further comprises a filtering voltage-stabilizing circuit, and the second current-limiting resistor is electrically connected with a power end of the switching power supply chip through the filtering voltage-stabilizing circuit.

Optionally, the rectifying and voltage-reducing circuit further comprises an RC filter circuit, and the output end of the rectifying bridge is electrically connected with the first primary winding through the RC filter circuit and the absorption circuit.

Compared with the prior art, the input end of the rectification step-down circuit is used for being connected with the mains supply, and the input end of the rectification power switch circuit is electrically connected with the output end of the rectification step-down circuit, so that the rectification step-down circuit converts alternating voltage of the mains supply into low-voltage alternating current, and the rectification power switch circuit converts the low-voltage alternating current output by the rectification step-down circuit into low-voltage direct current and provides a direct-current working power supply for the MCU control unit; the infrared sensing device is arranged at an indoor track lamp of a user, for example, a lighting area, after the user enters the lighting area, the infrared sensing device transmits detected information of person approaching to the MCU control unit, the MCU control unit drives the control switch circuit to be conducted so that the track lamp can work electrically to start lighting operation, after the user leaves the lighting area, the infrared sensing device adheres to the information of person far away and transmits the information to the MCU control unit, the MCU control unit drives the control switch circuit to be turned off so as to turn off the track lamp, in other words, the rail lamp can be automatically controlled to be turned on or turned off according to the fact that the user approaches to or leaves the lighting area, and the user experience is effectively improved.

Drawings

FIG. 1 is a schematic block diagram of a drive plate assembly in an embodiment of the invention;

FIG. 2 is a schematic diagram of a driving plate assembly according to an embodiment of the present invention;

FIG. 3 is a second schematic diagram of a driving plate assembly according to an embodiment of the present invention.

Reference numerals illustrate:

1-an infrared sensing device; 2-rectifying and voltage-reducing circuit; 21-a rectifier bridge; 22-step-down transformers; 23-starting a circuit; 24-an input voltage detection circuit; 25-an absorption circuit; 26-a filtering voltage stabilizing circuit; a 27-RC filter circuit; 3-rectifying a power switching circuit; 31-synchronous rectifiers; 32-a current limiting circuit; 4-MCU control unit; 5-controlling a switching circuit; 51-a current limiting resistor circuit; 6-track lamp.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein.

In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the description of the present specification, the descriptions of the terms "embodiment," "one embodiment," and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or embodiment is included in at least one embodiment or illustrated embodiment of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same examples or implementations. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or implementations.

In order to solve the above technical problems, as shown in fig. 1, an embodiment of the present invention provides a driving board assembly suitable for a track lamp, which includes a rectifying and voltage-reducingcircuit 2, a rectifying andpower switch circuit 3, aninfrared sensing device 1, anMCU control unit 4 and acontrol switch circuit 5, wherein an input end of the rectifying and voltage-reducingcircuit 2 is used for connecting with a mains supply, an input end of the rectifying andpower switch circuit 3 is electrically connected with an output end of the rectifying and voltage-reducingcircuit 2 so as to convert low-voltage ac outputted by the rectifying and voltage-reducingcircuit 2 into low-voltage dc, and an output end of the rectifying andpower switch circuit 3 is electrically connected with theMCU control unit 4 so as to supply power to theMCU control unit 4; the signal end of theMCU control unit 4 is electrically connected with theinfrared sensing device 1 to acquire information of approaching or separating of people detected by theinfrared sensing device 1, and theMCU control unit 4 is connected with thetrack lamp 6 belt through thecontrol switch circuit 5 to control the on-off of thetrack lamp 6 belt.

It should be noted that, since the working power source required by theMCU control unit 4 is low-voltage direct current, and the lighting circuit in the user's room is usually AC220V, the AC220V needs to be rectified and then reduced by the rectifying and reducingcircuit 2 to output low-voltage alternating current, and then the low-voltage alternating current is converted into low-voltage direct current by the rectifyingpower switch circuit 3, the low-voltage direct current can bedirect current 5V, at this time, the output end of the rectifyingpower switch circuit 3 is divided into two paths, one path provides theMCU control unit 4 with direct current working power, and the other path is connected with thetrack lamp 6 by thecontrol switch circuit 5, at this time, the low-voltage direct current not only can provide theMCU control unit 4 with direct current working power, but also can effectively control the automatic switch of thetrack lamp 6 by driving and controlling the on/off of theswitch circuit 5. The area where thetrack lamp 6 is installed may be defined as an illumination area, and theinfrared sensing device 1 may be an infrared sensor, so long as theinfrared sensing device 1 capable of detecting the approach or the separation of the user from the information is suitable for the present technical solution, and is not specifically limited herein. Thecontrol switch circuit 5 is an electrical switch that can be turned on or off by theMCU control unit 4, and is not particularly limited herein.

Theinfrared sensing device 1 can detect that a user approaches, enters or leaves an illumination area, and transmits a person approach or leave message to theMCU control unit 4, after the user enters the illumination area, theMCU control unit 4 outputs a PWM signal with a certain duty ratio according to the person approach message so as to drive thecontrol switch circuit 5 to be conducted and closed, so that a loop between the rectificationpower switch circuit 3 and thetrack lamp 6 is conducted, and thetrack lamp 6 is automatically opened; after the user leaves the illumination area, theMCU control unit 4 does not output PWM signals according to personnel distance information, so that the drivecontrol switch circuit 5 is turned off, and a loop between the rectificationpower switch circuit 3 and thetrack lamp 6 is turned off, so that thetrack lamp 6 is automatically turned off.

In this embodiment, the input end of the rectification step-downcircuit 2 is used for connecting with the mains supply, and the input end of the rectificationpower switch circuit 3 is electrically connected with the output end of the rectification step-downcircuit 2, so that the rectification step-downcircuit 2 converts the ac voltage of the mains supply into low-voltage ac, and the rectificationpower switch circuit 3 converts the low-voltage ac output by the rectification step-downcircuit 2 into low-voltage dc and provides theMCU control unit 4 with a dc working power supply; theinfrared sensing device 1 is installed at a place where atrack lamp 6 in a user room is provided with a lighting area, for example, when a user enters the lighting area, theinfrared sensing device 1 transmits detected information of approaching a person to theMCU control unit 4, theMCU control unit 4 drives thecontrol switch circuit 5 to be conducted so that thetrack lamp 6 is electrified to start lighting operation, when the user leaves the lighting area, theinfrared sensing device 1 transmits information of keeping away from the person to theMCU control unit 4, theMCU control unit 4 drives thecontrol switch circuit 5 to be turned off so as to turn off thetrack lamp 6, in other words, the opening or the closing of thetrack lamp 6 can be automatically controlled according to the mutual coordination of theinfrared sensing device 1, theMCU control unit 4 and thecontrol switch circuit 5, so that the user experience is effectively improved, and the user is not required to forget to turn off thetrack lamp 6 because manual control is not needed.

In one embodiment of the present invention, as shown in fig. 3, thecontrol switch circuit 5 includes a first switch tube and a protection capacitor, the control end of theMCU control unit 4 is connected to the gate of the first switch tube, the source and the drain of the first switch tube are respectively connected to one end of the rectifyingpower switch circuit 3 and thetrack lamp 6, and the protection capacitor is connected in parallel to the source and the drain of the first switch tube.

It should be noted that the specific circuit configuration of the entire driving board assembly is too large, so that it is exploded into fig. 2 and 3. In fig. 3, theMCU control unit 4 is represented by IC3, the first switching tube is represented by Q3, the first switching tube may be a MOS tube switch, and the protection capacitor C10 is represented; the output end of the rectificationpower switch circuit 3 outputs direct current ofdirect current 5V, so the direct current is electrically connected with thepin 1 of theMCU control unit 4, thereby realizing the supply of direct current working power supply to theMCU control unit 4; the control end of theMCU control unit 4, for example, thepin 4, can output a PWM signal to control the on-off of the first switching tube, and when the first switching tube is turned on, as shown in fig. 3, the circuit between the rectifyingpower switching circuit 3 and thetrack lamp 6 is all turned on, so that thetrack lamp 6 is electrically operated, and thetrack lamp 6 is automatically turned on; when the first switching tube is turned off, all loops between the rectifyingpower switching circuit 3 and thetrack lamp 6 are disconnected, so that thetrack lamp 6 is powered off and stopped, and thetrack lamp 6 is automatically turned off.

In general, if the number of loads such as thetrack lamps 6 is large or the power is large, if the switch for controlling the load such as the first switching tube is turned on or off too fast, an arc may occur at the first switching tube, thereby affecting the safety quality of the first switching tube; therefore, when the first switching tube is turned on or turned off, the protection capacitor can slow down the state change of the source electrode and the drain electrode of the first switching tube, which is equivalent to slow loading or load shedding, so that the safety quality of the first switching tube is effectively protected, the normal starting or turning off of thetrack lamp 6 can be prevented from being influenced too fast by the state change of the first switching tube, and thetrack lamp 6 can be effectively protected, so that the safety switching of thetrack lamp 6 is realized.

In one embodiment of the present invention, as shown in connection with fig. 3, thecontrol switch circuit 5 further includes a current limitingresistor circuit 51, and the current limitingresistor circuit 51 is connected in series between the control end of theMCU control unit 4 and the gate of the first switch tube.

It should be noted that, under normal conditions, when theMCU control unit 4 controls the MOS transistor to be electrified, the on-off frequency of the MOS transistor is very high, at this time, the current control capability of theMCU control unit 4 may be reduced, and the MOS transistor may be out of control; therefore, the current limitingresistor circuit 51 is connected between the control end of theMCU control unit 4 and the grid electrode of the first switching tube in series, when theMCU control unit 4 is used for controlling the first switching tube to be conducted, the current control capability of theMCU control unit 4 is effectively improved by the current limitingresistor circuit 51, the raised voltage is pulled down, the first switching tube adopting the MOS tube is prevented from being out of control, and when the MOS tube is powered off, the residual electricity in a later-stage circuit of the control end of theMCU control unit 4 can be discharged by the current limitingresistor circuit 51, so that the first switching tube is accurately controlled, and further the safer automatic control of the switching of thetrack lamp 6 is realized.

The current limitingresistor circuit 51 includes a current limiting resistor R21 and a current limiting resistor R20, where one end of the current limiting resistor R21 and one end of the current limiting resistor R20 are connected with theMCU control unit 4 and the ground respectively, and the other end of the current limiting resistor R21 and the other end of the current limiting resistor R20 are connected with the gate of the first switching tube after being shorted.

In one embodiment of the present invention, as shown in connection with fig. 3, the rectifyingpower switch circuit 3 includes asynchronous rectifier 31 and a currentlimiting circuit 32, wherein an output terminal of thesynchronous rectifier 31 is connected to an input terminal of the current limitingcircuit 32, and an output terminal of the current limitingcircuit 32 is electrically connected to theMCU control unit 4 and thetrack lamp 6, respectively.

It should be noted that, thesynchronous rectifier 31 may be represented by IC2, and the current limitingcircuit 32 includes a plurality of capacitors and resistors connected in parallel, so that the low-voltage dc output from the output end of thesynchronous rectifier 31 may be effectively limited; the input end of thesynchronous rectifier 31 is electrically connected with the secondary winding, and the output end of thesynchronous rectifier 31 is electrically connected with the input end of the current limitingcircuit 32, so that the low-voltage alternating current output by the secondary winding can be converted into low-voltage direct current through thesynchronous rectifier 31 and transmitted to the current limitingcircuit 32, and the current limitingcircuit 32 can effectively limit the low-voltage direct current output by thesynchronous rectifier 31 so as to stabilize the low-voltage direct current output by the output end of thesynchronous rectifier 31 and prevent the fluctuation from being too large to influence the normal operation of thetrack lamp 6.

In one embodiment of the present invention, as shown in connection with fig. 3, the rectifyingpower switch circuit 3 further includes a buck capacitor and a first current limiting resistor, which are connected in series and in parallel to the power supply terminal of thesynchronous rectifier 31.

It should be noted that, since the input end of thesynchronous rectifier 31 is connected to the secondary winding, when the voltage at the input end of the step-downtransformer 22 increases due to the voltage increase after the power grid or the load is cut off, the voltage output by the secondary winding also increases, so that the insulation and overvoltage of thesynchronous rectifier 31 are directly affected, and the normal operation of thesynchronous rectifier 31 is further affected; the step-down capacitor is represented by C4, and the first current limiting resistor is represented by R14; therefore, the step-down capacitor is connected in series with the first current-limiting resistor and then connected in parallel to the power supply end of thesynchronous rectifier 31, so that when the alternating voltage output by the secondary winding of the step-down transformer 22 passes through the step-down capacitor C4, a capacitive reactance is generated, and a current limiting effect is achieved; the first current limiting resistor R14 can release the residual charges on the buck capacitor C4, and acts as a leakage preventing resistor.

In one embodiment of the present invention, as shown in fig. 2, the rectifying andvoltage reducing circuit 2 includes a rectifyingbridge 21, a step-down transformer 22, a start-up circuit 23, a switching power supply chip, and an inputvoltage detecting circuit 24, where an input terminal of the rectifyingbridge 21 is used to connect to a mains supply, the step-downtransformer 22 includes a first primary winding, a second primary winding, and a secondary winding coupled to the first primary winding, an output terminal of the rectifyingbridge 21 is electrically connected to the first primary winding, the secondary winding is electrically connected to an output terminal of the rectifyingpower switching circuit 3, and an output terminal of the rectifyingbridge 21 is electrically connected to a power supply terminal of the switching power supply chip via the start-up circuit 23; the input end and the output end of the inputvoltage detection circuit 24 are respectively electrically connected with the second primary winding and the acquisition end of the switching power supply chip, and the control end of the switching power supply chip is electrically connected with the first primary winding.

Therectifier bridge 21 is represented by BD1, the step-downtransformer 22 is represented by T1, the first primary winding is represented by N1, the second primary winding is represented by N2, the secondary winding is represented by N3, the start-up circuit 23 includes two resistors connected in series, namely, a resistor R7 and a resistor R8, respectively, and the switching power supply chip is represented byIC 1; the inputvoltage detection circuit 24 includes a sampling resistor R12, a sampling resistor R13, and a capacitor C2, where an input end of the inputvoltage detection circuit 24 is electrically connected to the second primary winding, so that an operating current on the second primary winding can be detected in real time by using the inputvoltage detection circuit 24 as an input current, and then the input current sequentially passes through the sampling resistor R12 and the sampling resistor R13, so as to become an input voltage, so that an acquisition end of the switching power supply chip can acquire the input voltage of the step-downtransformer 22.

Because the output end of therectifier bridge 21 is electrically connected with the power end of the switch power supply chip through thestarting circuit 23, in other words, the input end and the output end of thestarting circuit 23 are respectively electrically connected with the output end of therectifier bridge 21 and the power end of the switch power supply chip, thestarting circuit 23 transmits the direct current output by therectifier bridge 21 to the switch power supply chip, and the direct current is not only used for starting the switch power supply chip, but also can enable the switch power supply chip to output driving pulse so as to control the output voltage and the output current of the step-down transformer 22; the direct current output by therectifier bridge 21 is respectively applied to thepin 1 of the switching power supply chip after passing through the resistor R7 and the resistor R8, so that the switching power supply chip starts to start working, and the switching power supply chip outputs a driving pulse from thepin 5 or thepin 6 of the switching power supply chip according to the input voltage detected by the inputvoltage detecting circuit 24, and the driving pulse is transmitted to the first primary winding, so that the output voltage and the output current of the step-downtransformer 22 can be flexibly controlled according to the input voltage of the step-downtransformer 22, and further the working voltage and the brightness of thetrack lamp 6 board can be effectively controlled.

In one embodiment of the present invention, as shown in connection with fig. 2, the rectifying andvoltage reducing circuit 2 further includes asnubber circuit 25, and thesnubber circuit 25 is electrically connected to the output terminal of the rectifyingbridge 21 and the first primary winding, respectively.

It should be noted that, in a normal case, when the switching power supply chip outputs the driving pulse to control the input voltage of the first primary winding in the step-downtransformer 22, an instantaneous peak-back voltage superposition is generated at the lower end of the first primary winding, so that insulation of the first primary winding is reduced and the step-downtransformer 22 operates normally, so that theabsorption circuit 25 is electrically connected with the output end of therectifier bridge 21 and the first primary winding respectively, and thus, theabsorption circuit 25 is utilized to effectively prevent the direct current voltage output by the output end of therectifier bridge 21 from directly entering the first primary winding, so as to prevent the instantaneous peak-back voltage superposition at the lower end of the first primary winding, thereby realizing protection of the step-downtransformer 22. Thesnubber circuit 25 includes a resistor R4 and a filter capacitor C1 connected in parallel, one end of the resistor R4 and one end of the filter capacitor C1 are electrically connected to the output end of therectifier bridge 21 and one end of the first primary winding, and the other end of the resistor R4 and the filter capacitor C1 are electrically connected to the first primary winding.

In one embodiment of the present invention, as shown in fig. 2, the rectifying and voltage-reducingcircuit 2 further includes a rectifying diode and a second current-limiting resistor, where an output end of the second primary winding is connected to an anode of the rectifying diode, and a cathode of the rectifying diode is electrically connected to a power supply end of the switching power supply chip through the second current-limiting resistor.

It should be noted that, the rectifying diode is denoted by D2, the second current limiting resistor is denoted by R9, and the output end of the second primary winding is connected with the anode of the rectifying diode, so that the alternating current output by the second primary winding is rectified by the rectifying diode D2 to output direct current, and then the direct current is limited by the second current limiting resistor, so as to provide stable direct current for the switching power supply chip, so as to ensure that the switching power supply chip can continuously and stably work.

In one embodiment of the present invention, as shown in fig. 2, the rectifying and voltage-reducingcircuit 2 further includes a filtering voltage-stabilizingcircuit 26, and the second current-limiting resistor is electrically connected to the power supply terminal of the switching power supply chip through the filtering voltage-stabilizingcircuit 26.

It should be noted that, the filteringvoltage stabilizing circuit 26 includes a capacitor C3 and a capacitor EC3 connected in parallel, the alternating current output by the second primary winding is rectified by a rectifying diode, then is limited by a second current limiting resistor, and finally the filteringvoltage stabilizing circuit 26 filters the direct current, so as to improve the voltage quality of the low-voltage direct current, and then the filtered direct current is transmitted to the switching power supply chip, so that the harmonic wave generated by the second primary winding is effectively prevented from affecting the power quality of the switching power supply chip, and the high-quality power supply operation of the switching power supply chip is realized.

In one embodiment of the present invention, as shown in fig. 2, the rectifying andvoltage reducing circuit 2 further includes anRC filter circuit 27, and the output terminal of the rectifyingbridge 21 is electrically connected to the first primary winding through theabsorption circuit 25 by theRC filter circuit 27.

It should be noted that, in general, the main function of therectifier bridge 21 is to convert the ac power of the mains supply into dc power, but the dc power is mixed with ac power of a certain component, so as to affect the quality of power supply to the dc load, such as theMCU control unit 4 and the switching power supply chip; therefore, the output end of therectifier bridge 21 is electrically connected with the first primary winding through theRC filter circuit 27 via theabsorption circuit 25, so that the AC in the DC output by therectifier bridge 21 can be filtered through theRC filter circuit 27, so that the AC component in the DC can be greatly reduced, and then the DC after the AC is filtered again via theabsorption circuit 25, so that the quality of the DC can be effectively improved, the waveform of the DC is smoother, the impact on electrical components in the rear-stage circuit is reduced, and the electrical components of the rear-stage circuit such as theMCU control unit 4 and the switching power supply chip are effectively protected.

Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the invention.

Claims (10)

1. The driving board assembly suitable for the track lamp is characterized by comprising a rectification voltage-reducing circuit (2), a rectification power switch circuit (3), an infrared sensing device (1), an MCU control unit (4) and a control switch circuit (5), wherein the input end of the rectification voltage-reducing circuit (2) is used for being connected with mains supply, the input end of the rectification power switch circuit (3) is electrically connected with the output end of the rectification voltage-reducing circuit (2) so as to convert low-voltage alternating current output by the rectification voltage-reducing circuit (2) into low-voltage direct current, and the output end of the rectification power switch circuit (3) is electrically connected with the MCU control unit (4) so as to supply power for the MCU control unit (4); the signal end of the MCU control unit (4) is electrically connected with the infrared sensing device (1) so as to acquire information that a person detected by the infrared sensing device (1) approaches or gets away from the information, and the MCU control unit (4) is connected with the track lamp (6) belt through the control switch circuit (5) so as to control the on-off of the control switch circuit (5) to switch the track lamp (6) belt.

2. The drive board assembly suitable for the track lamp according to claim 1, wherein the control switch circuit (5) comprises a first switch tube and a protection capacitor, a control end of the MCU control unit (4) is connected with a grid electrode of the first switch tube, a source electrode and a drain electrode of the first switch tube are respectively connected with one end of the rectifying power switch circuit (3) and the track lamp (6) in a belt mode, and the protection capacitor is connected in parallel with the source electrode and the drain electrode of the first switch tube.

3. The drive plate assembly for a track light according to claim 2, wherein the control switch circuit (5) further comprises a current limiting resistor circuit (51), the current limiting resistor circuit (51) being connected in series between the control end of the MCU control unit (4) and the gate of the first switching tube.

4. The drive board assembly for a track light according to claim 1, wherein the rectifying power switch circuit (3) comprises a synchronous rectifier (31) and a current limiting circuit (32), an output end of the synchronous rectifier (31) is connected with an input end of the current limiting circuit (32), and an output end of the current limiting circuit (32) is electrically connected with the MCU control unit (4) and the track light (6), respectively.

5. The drive board assembly for a track light according to claim 4, wherein the rectifying power switching circuit (3) further comprises a buck capacitor and a first current limiting resistor, the buck capacitor and the first current limiting resistor being connected in series and in parallel to a power supply terminal of the synchronous rectifier (31).

6. The drive board assembly for a track light according to claim 1, wherein the rectifying and step-down circuit (2) comprises a rectifying bridge (21), a step-down transformer (22), a starting circuit (23), a switching power supply chip and an input voltage detection circuit (24), wherein an input end of the rectifying bridge (21) is used for being connected with a mains supply, the step-down transformer (22) comprises a first primary winding, a second primary winding and a secondary winding coupled with the first primary winding, an output end of the rectifying bridge (21) is electrically connected with the first primary winding, the secondary winding is electrically connected with an output end of the rectifying power switching circuit (3), and an output end of the rectifying bridge (21) is electrically connected with a power supply end of the switching power supply chip through the starting circuit (23); the input end and the output end of the input voltage detection circuit (24) are respectively and electrically connected with the second primary winding and the acquisition end of the switching power supply chip, and the control end of the switching power supply chip is electrically connected with the first primary winding.

7. The drive board assembly for a track light according to claim 6, wherein the rectifying and voltage reducing circuit (2) further comprises an absorption circuit (25), the absorption circuit (25) being electrically connected to the output of the rectifying bridge (21) and the first primary winding, respectively.

8. The drive board assembly for a track lamp according to claim 6, wherein the rectifying and voltage reducing circuit (2) further comprises a rectifying diode and a second current limiting resistor, an output end of the second primary winding is connected with an anode of the rectifying diode, and a cathode of the rectifying diode is electrically connected with a power end of the switching power supply chip through the second current limiting resistor.

9. The drive board assembly for a track lamp according to claim 8, wherein the rectifying and voltage reducing circuit (2) further comprises a filtering voltage stabilizing circuit (26), and the second current limiting resistor is electrically connected with a power supply end of the switching power supply chip through the filtering voltage stabilizing circuit (26).

10. The drive board assembly for a track light according to claim 7, wherein the rectifying and voltage reducing circuit (2) further comprises an RC filter circuit (27), and the output of the rectifying bridge (21) is electrically connected to the first primary winding through the RC filter circuit (27) via the absorption circuit (25).

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