A kind of power supply circuits and light fixtureTechnical field
The present invention relates to power supply circuits field, relate in particular to a kind of power supply circuits and light fixture.
Background technology
At present, light fixture product majority employing lithium battery power supply, thereby majority now has corresponding supporting charger to this lithium cell charging, luminous to ensure that this light fixture continues.In the wild or under other conditions of supplying with without civil power, conventionally by hand generator to the power supply of this light fixture.But because manpower cannot shake generator uniformly, cause the spread of voltage of this generator output, easily burn charger and cannot be to this light fixture power supply.If lithium battery electric power deficiency, or generator output voltage shakiness, will cause light fixture to extinguish, give user's inconvenience, even jeopardize personal safety.
Summary of the invention
Technical problem to be solved by this invention is, a kind of power supply circuits and light fixture are provided, and described power supply circuits carry out safe power supply to the electric light in described light fixture.
Embodiments of the invention provide a kind of power supply circuits, for electric light is powered, described power supply circuits comprise the rectification filtering module of series connection successively, high voltage protective module and constant voltage module, described rectification filtering module connects extraneous alternating current generator, to receive extraneous alternating current, and described alternating current is converted to direct voltage, described high voltage protective module receives described direct voltage, and according to described direct voltage the state in conducting or cut-off, described constant voltage module receives described direct voltage through described high voltage protective module, and regulate described direct voltage to appropriate voltage value, thereby described electric light is carried out to protectiveness power supply.
Wherein, the first output head grounding of described rectification filtering module, the first end of described high voltage protective module is connected to the second output of described rectification filtering module, to receive described direct voltage, the second end of described high voltage protective module is connected to the first output of described rectification filtering module, the input of described constant voltage module is connected to the 3rd end of described high voltage protective module, to receive described direct voltage, the input of described constant voltage module is also connected to extraneous DC power supply terminal to start described constant voltage module, the output of described constant voltage module is connected to the first end of described electric light, the second end of described electric light is connected to the first output of described rectification filtering module, described constant voltage module is exported constant square wave voltage signal, so that described electric light is powered, in the time that described DC voltage value is greater than the first preset value, described high voltage protective module is by described constant voltage module short circuit, in the time that described DC voltage value is less than described the first preset value, the conducting of described high voltage protective module, described constant voltage module receives described direct voltage, and regulate described direct voltage to appropriate voltage value, and described electric light is powered.
Wherein, described high voltage protective module comprises switching tube and voltage-stabiliser tube, the control end of described switching tube is connected to the second output of described rectification filtering module and the positive pole of described voltage-stabiliser tube, the negative pole of described voltage-stabiliser tube is connected to the first output of described rectification filtering module, the first end of described switching tube is connected to the second output of described rectification filtering module, to receive described direct voltage, the second end of described switching tube is connected to the input of described constant voltage module, in the time that described DC voltage value is greater than described first preset value of described voltage-stabiliser tube, described switching tube cut-off, in the time that described DC voltage value is less than described first preset value of described voltage-stabiliser tube, described switching tube conducting, described voltage-stabiliser tube is equivalent to open circuit.
Wherein, described constant voltage module comprises single-chip microcomputer, inductance, the first diode, the second diode and the first electric capacity, the input of described single-chip microcomputer is connected to the second end and the described extraneous DC power supply terminal of described switching tube, it is unsettled that the output current of described single-chip microcomputer arranges end, the switch terminals of described single-chip microcomputer is connected to described extraneous DC power supply terminal, the output of described single-chip microcomputer is connected to the positive pole of described the first diode through described inductance, the negative pole of described the first diode is connected to the first end of described electric light, the positive pole of described the second diode is connected to the output of described single-chip microcomputer, the negative pole of described the second diode is connected to the negative pole of described voltage-stabiliser tube, the positive pole of described the first electric capacity is connected to the positive pole of described the first diode, the negative pole of described the first electric capacity is connected to the negative pole of described voltage-stabiliser tube, the feedback end of described single-chip microcomputer is connected to described extraneous DC power supply terminal, to make the constant described square wave voltage signal of described single-chip microcomputer output appropriate voltage value, in the time that described single-chip microcomputer output high level signal is powered to described electric light, described inductance and described the first electric capacity are in charged state, in the time of described single-chip microcomputer output low level signal, described inductance and described the first capacitor discharge, so that described electric light is continued to power supply, described the second diode, described inductance and described the first electric capacity form current circuit, the earth terminal ground connection of described single-chip microcomputer.
Wherein, described constant voltage module also comprises the first resistance, the second resistance, the 3rd resistance, the switch terminals of described single-chip microcomputer is connected to described extraneous DC power supply terminal with current limliting through described the first resistance, the first end of described the second resistance is connected to the negative pole of described the first diode, the second end of described the second resistance is connected in the negative pole of described the second diode through described the 3rd resistance, the second end of described the second resistance is also connected in described singlechip feedbsck end, in the time that the partial pressure value at described second resistance the second end place is greater than inside second preset value of described single-chip microcomputer, the described square wave voltage signal that described Single-chip Controlling output duty cycle reduces, when described in the partial pressure value at described second resistance the second end place is less than the inside of described single-chip microcomputer when the second preset value, the described square wave voltage signal that described Single-chip Controlling output duty cycle increases, to obtain the described direct voltage of appropriate voltage value, thereby to described electric light stable power-supplying.
Wherein, described constant voltage module also comprises the second electric capacity and the 3rd electric capacity, and described the second electric capacity is connected between described extraneous DC power supply terminal and the negative pole of described voltage-stabiliser tube, to cushion described direct voltage, described the 3rd Capacitance parallel connection is in the two ends of described the second resistance, with filtering.
Wherein, described constant voltage module also comprises the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance, the second end of described electric light is connected in the negative pole of described the second diode through described the 4th resistance, described the 5th resistance, the 6th resistance and the 7th resistance are all parallel to the two ends of described the 4th resistance, described the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance are all for improving the error precision of described single-chip microcomputer, increase the power of described single-chip microcomputer, the output current of described single-chip microcomputer arranges holds the input that is connected in described single-chip microcomputer through described the 8th resistance, described the 8th resistance is for current limliting.
Wherein, described extraneous alternating current generator is threephase alternator, described rectification filtering module comprises rectifier bridge and the 4th electric capacity, three inputs of described rectifier bridge are connected respectively three outputs of described threephase alternator, the first output head grounding of described rectifier bridge, the second output of described rectifier bridge is connected to the first end of described switching tube, and described the 4th electric capacity is connected between first and second output of described rectifier bridge.
Wherein, described switching tube is NPN triode, and control end, first end and second end of described switching tube corresponds to respectively base stage, collector electrode and the emitter of described NPN triode.
Separately, the embodiment of the present invention also provides a kind of light fixture, and described light fixture comprises above-mentioned power supply circuits and described electric light, and described power supply circuits are for powering to described electric light.
The power supply circuits and the light fixture that adopt the embodiment of the present invention to provide, reached without mains-supplied, in the hypodynamic situation of lithium battery, meets an urgent need to some electric equipment products, as the object of light fixture power supply.These power supply circuits, by the effect of high voltage protective module, have increased the practicality of this light fixture, thereby give this light fixture safe power supply.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the theory diagram of a kind of power supply circuits of providing of the embodiment of the present invention;
Fig. 2 is the module diagram of the power supply circuits based on shown in Fig. 1 that provide of the embodiment of the present invention;
Fig. 3 is the circuit diagram of the power supply circuits based on shown in Fig. 2 that provide of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Below with reference to accompanying drawing, embodiments of the invention are described.The embodiment of the present invention provides a kind of light fixture, and this light fixture comprises power supply circuits 100 and electric light 200, and described power supply circuits 100 are for powering to described electric light 200.Referring to Fig. 1, the theory diagram of a kind of power supply circuits 100 that provide for embodiment in the present invention.Described power supply circuits 100 comprise the rectification filtering module 10 of series connection successively, high voltage protective module 20 and constant voltage module 30, described rectification filtering module 10 connects extraneous alternating current generator, to receive extraneous alternating current, and described alternating current is converted to direct voltage, described high voltage protective module 20 receives described direct voltage, and according to described direct voltage the state in conducting or cut-off, described constant voltage module 30 receives described direct voltage through described high voltage protective module 20, and regulate described direct voltage to appropriate voltage value, thereby described electric light 200 is carried out to protectiveness power supply, and then reach by extraneous alternating current generator to the object of described electric light 200 safe power supplies.
Concrete, referring to Fig. 2, be the module diagram of the power supply circuits based on shown in Fig. 1 that provide of the embodiment of the present invention.The first output head grounding of described rectification filtering module 10, the first end of described high voltage protective module 20 is connected to the second output of described rectification filtering module 10, to receive described direct voltage, the second end of described high voltage protective module 20 is connected to the first output of described rectification filtering module 10, the input of described constant voltage module 30 is connected to the 3rd end of described high voltage protective module 20, to receive described direct voltage, the input of described constant voltage module 30 is also connected to extraneous DC power supply terminal VD to start described constant voltage module 30, the output of described constant voltage module 30 is connected to the first end of described electric light 200, the second end of described electric light 200 is connected to the first output of described rectification filtering module 10, described constant voltage module 30 is exported constant square wave voltage signal, so that described electric light 200 is powered.In the time that described DC voltage value is greater than the first preset value; described high voltage protective module 20 is by described constant voltage module 30 short circuits; in the time that described DC voltage value is less than described the first preset value; described high voltage protective module 20 conductings; described constant voltage module 30 receives described direct voltage; and regulate described direct voltage to appropriate voltage value, and described electric light 200 is powered.
Referring to Fig. 3, the circuit diagram of the power supply circuits based on shown in Fig. 2 100 that provide for the embodiment of the present invention, does further complete and limit with power supply circuits 100 module diagrams to shown in Fig. 2.Described high voltage protective module 20 comprises switching tube Q1 and voltage-stabiliser tube ZD, the control end of described switching tube Q1 is connected to the second output of described rectification filtering module 10 and the positive pole of described voltage-stabiliser tube ZD, the negative pole of described voltage-stabiliser tube ZD is connected to the first output of described rectification filtering module 10, the first end of described switching tube Q1 is connected to the second output of described rectification filtering module 10, to receive described direct voltage, the second end of described switching tube Q1 is connected to the input of described constant voltage module 30, in the time that described DC voltage value is greater than described the first preset value of described voltage-stabiliser tube ZD, described switching tube Q1 cut-off, in the time that described DC voltage value is less than described the first preset value of described voltage-stabiliser tube ZD, described switching tube Q1 conducting, what described voltage-stabiliser tube ZD was equivalent to opens circuit.In present embodiment, the voltage stabilizing value of described voltage-stabiliser tube ZD is 15V, and described the first preset value is 15V.Described switching tube Q1 is NPN triode, control end, first end and the second end of described switching tube Q1 corresponds to respectively base stage, collector electrode and the emitter of described NPN triode, between the base stage of described NPN triode and collector electrode, be connected the 9th resistance R 9, with current limliting.In other embodiments, the voltage stabilizing value of described voltage-stabiliser tube ZD can be selected to determine according to the specific works voltage of described power supply circuits 100.Described switching tube Q1 can be other PNP triodes or other field effect transistor.
Described constant voltage module 30 comprises single-chip microcomputer U1, inductance L 1, the first diode D1, the second diode D2 and the first capacitor C 1, the input VCC of described single-chip microcomputer U1 is connected to the second end and the described extraneous DC power supply terminal VD of described switching tube Q1, it is unsettled that the output current of described single-chip microcomputer U1 arranges end OCSET, the switch terminals EN of described single-chip microcomputer U1 is connected to described extraneous DC power supply terminal VD, two output OUT of described single-chip microcomputer U1 connect, and be connected to the positive pole of described the first diode D1 through described inductance L 1, the negative pole of described the first diode D1 is connected to the first end of described electric light 200, the positive pole of described the second diode D2 is connected to the output of described single-chip microcomputer U1, the negative pole of described the second diode D2 is connected to the negative pole of described voltage-stabiliser tube ZD, the positive pole of described the first capacitor C 1 is connected to the positive pole of described the first diode D1, the negative pole of described the first capacitor C 1 is connected to the negative pole of described voltage-stabiliser tube ZD, the feedback end FB of described single-chip microcomputer U1 is connected to described extraneous DC power supply terminal VD, to make the constant described square wave voltage signal of described single-chip microcomputer U1 output appropriate voltage value, now these power supply circuits 100 are without feedback.In the time that described single-chip microcomputer U1 output high level signal is powered to described electric light 200, described inductance L 1 and described the first capacitor C 1 are in charged state, in the time of described single-chip microcomputer U1 output low level signal, described inductance L 1 and described the first capacitor C 1 are discharged, so that described electric light 200 is continued to power supply.Described the second diode D2, described inductance L 1 and described the first capacitor C 1 form current circuit, thereby protect described inductance L 1 and the first capacitor C 1.Two earth terminal VSS of described single-chip microcomputer U1 connect and ground connection.In present embodiment, the model of described single-chip microcomputer U1 is AP1538.In other embodiments, the model type of other suitable single-chip microcomputer U1 can be selected as required, output square wave voltage signal can be reached.
Described constant voltage module 30 also comprises the first resistance R 1, the second resistance R 2, the three resistance R 3, and the switch terminals EN of described single-chip microcomputer U1 is connected to described extraneous DC power supply terminal VD with current limliting through described the first resistance R 1, and described the first resistance R 1 is for current limliting.The first end of described the second resistance R 2 is connected to the negative pole of described the first diode D1, the second end of described the second resistance R 2 is connected in the negative pole of described the second diode D2 through described the 3rd resistance R 3, the second end of described the second resistance R 2 is also connected in the feedback end FB of described single-chip microcomputer U1, so that a point feedback end FB who is pressed on described single-chip microcomputer U1 to be provided.In the time that the partial pressure value at described the second resistance R 2 second end places is greater than inside the second preset value of described single-chip microcomputer U1, described single-chip microcomputer U1 controls the described square wave voltage signal that output duty cycle reduces, when described in the partial pressure value at described the second resistance R 2 second end places is less than the inside of described single-chip microcomputer U1 when the second preset value, described single-chip microcomputer U1 controls the described square wave voltage signal that output duty cycle increases, to obtain the described direct voltage of appropriate voltage value, thereby to described electric light 200 stable power-supplyings.
Described constant voltage module 30 also comprises the second capacitor C 2 and the 3rd capacitor C 3; described the second capacitor C 2 is connected between described extraneous DC power supply terminal VD and the negative pole of described voltage-stabiliser tube ZD; to cushion described direct voltage; avoid described direct voltage to be directly inputted to described single-chip microcomputer U1 upper, thereby protect described single-chip microcomputer U1.Described the 3rd capacitor C 3 is parallel to the two ends of described the second resistance R 2, with filtering.
Described constant voltage module 30 also comprises the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and the 8th resistance R 8, the second end of described electric light 200 is connected in the negative pole of described the second diode D2 through described the 4th resistance R 4, described the 5th resistance R 5, the 6th resistance R 6 and the 7th resistance R 7 are all parallel to the two ends of described the 4th resistance R 4, described the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6 and the 7th resistance R 7, all for improving the error precision of described single-chip microcomputer U1, increase the power of described single-chip microcomputer U1.The output current of described single-chip microcomputer U1 arranges the input VCC that holds OCSET to be connected in described single-chip microcomputer U1 through described the 8th resistance R 8, and described the 8th resistance R 8 is for current limliting.In other embodiments, can, according to the needs of described single-chip microcomputer U1, select whether need to arrange described the 5th resistance R 5, the six resistance R 6 and the 7th resistance R 7, or more other resistance are set.
Described extraneous alternating current generator is threephase alternator, described rectification filtering module 10 comprises rectifier bridge D3 and the 4th capacitor C 4, three input a of described rectifier bridge D3, b and c are connected respectively three outputs of described threephase alternator, the first output head grounding of described rectifier bridge D3, the second output of described rectifier bridge D3 is connected to the first end of described switching tube Q1, and described the 4th capacitor C 4 is connected between first and second output of described rectifier bridge D3.In present embodiment, described extraneous alternating current generator is hand-operated three-phase generator, to reach the object that also can power to described electric light 200 without civil power alternating current in the wild.
In embodiment of the present invention, the alternating voltage that described hand-operated three-phase generator is exported is 5～10V, reaches as high as 22V.This alternating voltage is through the rectifying and wave-filtering processing of described rectifier bridge D1 and described the 4th capacitor C 4; export described direct voltage; the switching tube Q1 of described direct voltage in described high voltage protective module 20 and the protective effect processing of voltage-stabiliser tube ZD; be input to described constant voltage module 30; process and obtain 3.7V left and right through described constant voltage module 30; electric current is the described direct voltage of 750mA, thereby described electric light 200 is protected to power supply.In order to make described electric light 200 Chang Liang, described power supply circuits 100 also comprise battery, and the positive pole of described battery is connected to the first end of described electric light 200, and the negative pole of described battery is connected to the second end of described electric light 200.Described battery is 3.2V lithium battery.
The power supply circuits 100 and the light fixture that adopt the embodiment of the present invention to provide, reached without commercial power charged, in the hypodynamic situation of lithium battery, meets an urgent need to some electric equipment products, as the object of light fixture power supply.These power supply circuits 100, by the effect of high voltage protective module 20, have increased the practicality of this light fixture, thereby give this light fixture safe charging.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The amendment done within any spirit at above-mentioned execution mode and principle, be equal to and replace and improvement etc., within all should being included in the protection range of this technical scheme.