Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless explicitly specified 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; can be mechanically or electrically connected; 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.
Referring to fig. 1, the present embodiment provides a relay efficiency compensation circuit 100, which includes an MPU main control circuit 110, an efficiency compensation circuit 120, a relay driving circuit 130, a temperature sampling feedback circuit 140, a voltage and current sampling analysis circuit 150, and a zero-crossing sampling circuit 160.
The MPU main control circuit 110 is connected to the relay driving circuit 130, the temperature sampling feedback circuit 140, the voltage and current sampling analysis circuit 150, and the zero-crossing sampling circuit 160, and the efficiency compensation circuit 120 is connected to the MPU main control circuit 110 through the relay driving circuit 130.
The zero-crossing sampling circuit 160 is used for realizing zero-crossing instant switching of current and voltage, detecting the contact switching-on and switching-off working condition of the relay through voltage and current zero-crossing detection control, detecting the contact switching-on and switching-off speed, the opening distance, the contact stroke and the contact wear state, detecting the current, the voltage and the temperature among protection contacts, ensuring that the current is bypassed in a zero-crossing area by the silicon controlled rectifier when the contacts are switched on, the silicon controlled rectifier is only conducted at the moment of switching-on and switching-off of the circuit, the contacts are responsible for keeping normal conduction of the circuit after being put into operation, the silicon controlled rectifier immediately exits operation at the moment, accurate zero-crossing instant switching is realized, the loss of not only electric energy is minimum, and the performance of the relay is the most stable and reliable.
Alternatively, referring to FIG. 2, the MPU master control circuit 110 may be a microcontroller of model LPC 1768.
Optionally, referring to fig. 3, the relay driving circuit 130 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first triode Q1, a second triode Q2, and a first diode D1, where the first resistor R1 is connected to one end of the second resistor R2 by a power supply, the other end of the first resistor R1 is connected to an emitter of the first triode Q1, the other end of the second resistor R2 is connected to a base of the first triode Q1, one end of the third resistor R3 is connected to the MPU master control circuit, the other end is connected to a base of the first triode Q1, the fourth resistor R4 is connected between a collector of the first triode Q1 and a base of the second triode Q2, the fifth resistor R5 is connected between the base of the second triode Q2 and the emitter of the second triode Q1, and the forward conducting end of the first diode D1 is connected to a collector of the second triode Q2.
The resistance of the first resistor R1 may be 220 ohms, the resistance of the second resistor R2 may be 10K ohms, the resistance of the third resistor R3 may be 4.7K ohms, the resistance of the fourth resistor R4 may be 5.1K ohms, the resistance of the fifth resistor R5 may be 4.7K ohms, the type of the first transistor Q1 may be SS8550, and the type of the second transistor Q2 may be 5551.
Optionally, referring to fig. 4, the efficiency compensation circuit 120 includes a relay, a sixth resistor R6, a sliding rheostat R7, and a second capacitor C2, where one end of the sixth resistor R6 is connected to the voltage-current sampling analysis circuit, the other end is connected to the relay, one end of the second capacitor is connected between the sixth resistor R6 and the relay, the other end is connected to one end of the sliding rheostat R7, and the other end of the sliding rheostat R7 is connected to the relay.
The resistance of the sixth resistor R6 may be 1K ohms, the capacitance of the second capacitor C2 may be 0.1uF, and the resistance of the sliding resistor R7 may be 20K ohms.
Optionally, referring to fig. 5, the temperature sampling feedback circuit 140 includes a first amplifier U1, a zener diode Z1, and a first capacitor C1, where an output end of the first amplifier U1 is connected to the MPU main control circuit, an input end of the first amplifier U1 is connected to an output end of the first amplifier U1, another input end of the first amplifier U1 is connected to the relay, and the zener diode Z1 and the first capacitor C1 are respectively connected to another input end of the first amplifier U1.
The signal of the first amplifier may be LM258, the signal of the zener diode Z1 may be SS16, and the capacitance value of the first capacitor C1 may be 0.1uF.
Optionally, referring to fig. 6, the voltage-current sampling analysis circuit 150 includes: a temperature sensor, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a third capacitor C3, a first Schottky diode Q3, a second Schottky diode Q4 and an electric energy analyzer; the electric energy analyzer is connected with the MPU main control circuit, and is also connected with one end of a sixth resistor R6, a ninth resistor R9 and an eighth resistor R8 respectively, the other end of the eighth resistor R8 is also connected with one output end of the sensor, the other end of the ninth resistor R9 is respectively connected with a third capacitor C3 and a tenth resistor R10, one ends of a first Schottky diode Q3 and a second Schottky diode Q4 are respectively connected with the other end of the tenth resistor R10, the other ends of the first Schottky diode Q3 and the second Schottky diode Q4 are respectively connected with the third capacitor, and the second Schottky diode Q4 is also connected with the other output end of the sensor.
The resistance of the eighth resistor R8 may be 390 ohms, the resistance of the ninth resistor R9 may be 510 ohms, the resistance of the tenth resistor R10 may be 270 ohms, the capacitance of the third capacitor C3 may be 0.1uF, and the types of the first schottky diode Q3 and the second schottky diode Q4 may be BAT54SLT1.
Optionally, referring to fig. 7, the zero-cross sampling circuit 160 includes a fourth capacitor C4, a second diode D2, a second amplifier U2, an eleventh resistor R11, a twelfth resistor R12, a photocoupler, a thirteenth resistor R13, and a bridge; the output end of the second amplifier U2 is connected with the MPU main control circuit, the fourth capacitor C4 and the second diode D2 are connected in parallel and then connected in series between one input end and the output end of the second amplifier U2, the twelfth resistor R12 and the eleventh resistor R11 are connected between one input end of the second amplifier U2 and the photoelectric coupler, the thirteenth resistor R13 is connected between the photoelectric coupler and the bridge, and the bridge is also used for connecting loads.
The capacitance value of the fourth capacitor C4 may be 0.1uF, the model of the second diode D2 may be IN4148, the resistance value of the eleventh resistor R11 may be 10K ohms, the resistance value of the twelfth resistor R12 may be 390 ohms, the model of the photocoupler may be HCP2630, and the resistance value of the thirteenth resistor R13 may be 390 ohms.
Alternatively, the second amplifier U2 may have a model LM258.
Optionally, referring to fig. 8, an embodiment of the present invention further provides a relay efficiency compensation system 200, which includes the relay efficiency compensation circuit 100 according to any one of the first embodiment and a load 210, where the load is connected to the zero-crossing sampling circuit 100, for example, connected to a bridge of the zero-crossing sampling circuit.
The load is a non-resistive load. For example, a computer lamp, an LED lamp, a motor, etc. can be used.
In summary, the relay efficiency compensation circuit and the relay efficiency system provided by the embodiments of the present invention include: the system comprises an MPU main control circuit, an efficiency compensation circuit, a relay driving circuit, a temperature sampling feedback circuit, a voltage and current sampling analysis circuit and a zero-crossing sampling circuit; the MPU main control circuit is respectively connected with the relay driving circuit, the temperature sampling feedback circuit, the voltage and current sampling analysis circuit and the zero-crossing sampling circuit, and the efficiency compensation circuit is connected with the MPU main control circuit through the relay driving circuit; the zero-crossing sampling circuit is used for realizing instantaneous switching of current and voltage, detecting the contact switching-on and switching-off working condition of the relay through voltage and current zero-crossing detection control, detecting the contact switching-on and switching-off speed, the opening distance, the contact stroke and the contact wear state, detecting the current, the voltage and the temperature between protection contacts, ensuring that the current is bypassed in a zero-crossing area by the silicon controlled rectifier when the contacts are switched on and off, ensuring that the silicon controlled rectifier is only switched on at the moment of switching-on and off of the circuit, keeping the normal conduction of the circuit after the contacts are charged, immediately exiting the operation of the silicon controlled rectifier at the moment, accurately switching zero-crossing, having the least non-single electric energy loss, and the relay has the most stable and reliable performance.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.