A dual-coil energy-saving control circuit

Abstract

This application relates to the technical field of relays or contactors, and particularly to a dual-coil energy-saving control circuit, which includes an input and protection module, a power supply module, a dual-coil control module, and a single-chip microcomputer drive control module. By adopting a modular design, the circuit structure is simple. In terms of function expansion, digital control of analog circuits is used, and new functions can be achieved only through software programming. The single-chip microcomputer control technology using digital methods is combined with two dual-coil structures (parallel and series). Through appropriate circuits and the internal software program algorithms of the single-chip microcomputer, real-time dynamic energy-saving control can be achieved for dual-coil structure relays or contactors under different power supply external characteristics. By separately designing two energy-saving circuits suitable for parallel dual-coil starting and series dual-coil holding, the flexibility of product design is improved, and the design difficulty and cost are greatly reduced.

Description

Technical Field

[0001] This application relates to the technical fields of relays and contactors, and particularly relates to a dual-coil energy-saving control circuit. Background Art

[0002] In a traditional dual-coil energy-saving control circuit, a certain logic timing circuit is mainly designed with analog and digital integrated circuits as the core. This circuit is the same as the delay control circuit in a hybrid delay relay or contactor. The main types of delay circuits are resistor-capacitor (RC) delay or IC integrated circuit delay. However, the production and debugging of the delay circuit are complex, the working timing is single, the functional state is simple, and the power control ability of the coil is weak. It has the following three disadvantages in practical applications:

[0003] 1. In terms of timing logic control, for RC delay or IC delay, at three extreme temperatures, their highest delay accuracies are ±10% and ±5% respectively, and the consistency is not high, so precise power control cannot be achieved.

[0004] 2. It can only achieve the switching between two working states to save energy. Under complex power supply external characteristics, the abilities of dynamic voltage monitoring, power monitoring, abnormal characteristic detection, and power adjustment are weak.

[0005] 3. The circuit design is complex, and the debugging process and the setting of working points are complicated. For different power consumption requirements or coil parameters, the circuit needs to be redesigned, built, and the working points need to be set and debugged again. Summary of the Invention

[0006] To solve one of the above technical problems, this application provides a dual-coil energy-saving control circuit, including an input and protection module: used for rectifying, filtering, and surge protection of the input power supply, and outputting a signal VCC; a power supply module: connected to the output end of the input and protection module, used for converting the signal VCC into a constant voltage power supply signal VDD; a dual-coil control module: used for controlling the startup and shutdown of two coils in a certain timing or electrical condition to achieve energy-saving control; a single-chip microcomputer drive control module: connected to the power supply module and the dual-coil control module, used for real-time monitoring of the signal VCC, and controlling the dual-coil control module in a certain timing to achieve energy-saving control.

[0007] Preferably, the input and protection module includes a power input terminal IN+, an output terminal VCC for outputting the signal VCC, a transient voltage suppression diode TVS, a full-bridge rectifier BD, beads L1 and L2, and a capacitor C1; one ends of the beads L1 and L2 are respectively connected to the power input terminal IN+ and ground, one ends of the transient voltage suppression diode TVS and the full-bridge rectifier BD are connected to the bead L1, and the other ends are connected to the bead L2. The output terminal of the full-bridge rectifier BD is connected to the signal VCC output terminal and the capacitor C1.

[0008] Preferably, the input and protection module further includes a voltage monitoring circuit, which is connected to the output terminal of the full-bridge rectifier BD and outputs an analog voltage signal T1.

[0009] Preferably, the power supply module includes a DC / DC converter and its configuration circuit. The input terminal of the DC / DC converter is connected to the signal VCC, and the constant voltage power supply signal VDD is output at its output terminal.

[0010] Preferably, the single-chip microcomputer drive control module includes a PIC single-chip microcomputer. An ADC conversion circuit is provided inside the PIC single-chip microcomputer. Port 1 of the PIC single-chip microcomputer is connected to the constant voltage power supply signal VDD; Port 2 of the PIC single-chip microcomputer is connected to the analog voltage signal T1, and digital voltage signals T2 and T3 are respectively output at ports 5 and 6 through the ADC conversion circuit.

[0011] Preferably, the parallel dual-coil start control module includes coils CC and HC, MOS transistors Q2 and Q3. One ends of the coils CC and HC are connected to the constant voltage power supply signal VDD; the other end of the coil CC is connected in series with the MOS transistor Q3, and the other end of the coil HC is connected in series with the MOS transistor Q2; the gate of the MOS transistor Q2 is connected to the digital voltage signal T2; the gate of the MOS transistor Q3 is connected to the digital voltage signal T3.

[0012] Preferably, the series dual-coil hold control module includes coils CC and HC, MOS transistors Q2 and Q3. The coil CC is connected to the signal VCC; the other end of the coil CC is connected in series with the coil HC and the MOS transistor Q2, and the MOS transistor Q3 is connected in parallel across both ends of the series circuit of the coil HC and the MOS transistor Q2; the gate of the MOS transistor Q2 is connected to the digital voltage signal T2; the gate of the MOS transistor Q3 is connected to the digital voltage signal T3.

[0013] Preferably, the dual-coil control module further includes a first discharge circuit connected in parallel with the coils CC and HC respectively.

[0014] Preferably, the first discharge circuit includes a zener diode and an antiparallel diode. One end of the zener diode is connected to one end of the coil CC or the coil HC, and the other end is connected to one end of the antiparallel diode; the other end of the antiparallel diode is connected to the other end of the coil CC or the coil HC.

[0015] Preferably, it further includes a second discharge circuit, and the second discharge circuit is connected in parallel with the series circuit composed of the coil CC and the coil HC; the second discharge circuit includes a zener diode and an antiparallel diode. One end of the zener diode is connected to the VCC, and the other end is connected to one end of the antiparallel diode; the other end of the antiparallel diode is connected to the drain of the MOS transistor Q2.

[0016] As can be seen from the above, the application of the present application can obtain the following beneficial effects: This circuit adopts a modular design, and the circuit structure is simple. In terms of function expansion, it uses digital control of analog circuits, and new functions can be realized only through software programming. It adopts the single-chip microcomputer control technology in digital mode. Through a suitable circuit and the internal software program algorithm of the single-chip microcomputer, the double-coil structure relay or contactor can achieve real-time dynamic energy-saving control under different power supply external characteristics. By separately designing two energy-saving circuits suitable for parallel double coils and series double coils, the design flexibility is improved, the coil energy-saving function under different coil connection methods is realized, the design difficulty and cost are reduced, and the technical effects achieved are:

[0017] 1. The design difficulty and cost are reduced, the delay accuracy is improved, and accurate energy-saving control is realized. The energy-saving double-coil control circuit inherits the characteristics of intelligence, high reliability, general circuit function, and strong expandability of the single-chip microcomputer control circuit.

[0018] 2. Under complex power supply external characteristics, it has the abilities of dynamic voltage and power monitoring, abnormal characteristic detection, and accurate power adjustment, and at the same time, it can achieve a highly reliable working ability under poor power supply external characteristics such as overvoltage and undervoltage.

[0019] 3. The design flexibility is improved, and it can be realized under different power consumption requirements or coil parameters without re-designing the circuit, debugging the circuit, and setting the working point. It uses digital control of analog circuits, and new functions can be realized only through software programming. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments of the present application or the prior art. Obviously, the drawings in the following description are only a part of the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 Schematic diagram of the parallel - type dual - coil starting energy - saving control circuit in Embodiment 1 of the present application;

[0022] Figure 2 Schematic diagram of the input and protection module of the parallel - type dual - coil starting energy - saving control circuit in Embodiment 1 of the present application;

[0023] Figure 3 Schematic diagram of the power module of the parallel - type dual - coil starting energy - saving control circuit in Embodiment 1 of the present application;

[0024] Figure 4 Schematic diagram of the single - chip microcomputer drive control module of the parallel - type dual - coil starting energy - saving control circuit in Embodiment 1 of the present application;

[0025] Figure 5 Schematic diagram of the dual - coil control module of the parallel - type dual - coil starting energy - saving control circuit in Embodiment 1 of the present application;

[0026] Figure 6 Schematic diagram of the series - type dual - coil holding energy - saving control circuit in Embodiment 2 of the present application;

[0027] Figure 7 Schematic diagram of the dual - coil control module of the series - type dual - coil holding energy - saving control circuit in Embodiment 2 of the present application.

[0028] Figure 8 Flowchart of the PIC single - chip microcomputer program in one of the embodiments of the present application. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0030] Embodiment 1

[0031] The traditional double - coil energy - saving control circuit mainly designs a definite logic timing circuit with analog and digital integrated circuits as the core. This circuit is the same as the delay control circuit in a hybrid delay relay or contactor. The main types of delay circuits are resistor - capacitor (RC) delay or IC integrated - circuit - type delay, which can achieve energy - saving for double - coils. However, the structure design of the delay circuit is difficult, the production and debugging are complex, the working timing is single, the functional state is simple, and the dynamic power control ability of the coil is weak. In the structure of traditional energy - saving (RC or IC delay - circuit method) relays or contactors, there is only a parallel - type double - coil structure and its control circuit, which limits the flexibility of structure design and circuit design during the design process and increases the design difficulty of the design structure.

[0032] To solve the above - mentioned technical problems, this embodiment provides a double - coil energy - saving control circuit. As Figure 1 shown, it includes an input and protection module 1, a power supply module 2, a single - chip microcomputer drive control module 3, and a double - coil control module 4. The input and protection module 1 is used to rectify, filter, and prevent surges for the externally input power supply. The externally input power supply, after being processed by the input and protection module 1, serves as a power - supply signal available for the power supply module 2, the single - chip microcomputer drive control module 3, and the double - coil control module 4. The power supply module 2 is connected to the output end of the input and protection module 1 and transforms the signal VCC into a constant - voltage power - supply signal VDD. The double - coil control module 4, the power supply module 2 is connected to the output end of the input and protection module 1, and is used to start the circuit and control the energy - saving of the circuit. The single - chip microcomputer drive control module 3 is connected to the power supply module 2 and the double - coil control module 4, and is used to monitor the signal VCC in real time and control the double - coil control module 4 to start energy - saving control. This energy - saving double - coil control circuit inherits the characteristics of the single - chip microcomputer control circuit, such as intelligence, high reliability, general - purpose circuit functions, and strong expandability.

[0033] Specifically, as Figure 2 shown, the input and protection module 1 includes a power - supply input terminal IN +, a transient - voltage suppressor diode TVS, a full - bridge rectifier BD, a magnetic bead, a capacitor C1, and a power - supply output terminal VCC for the output signal VCC. One end of the transient - voltage suppressor diode TVS and the full - bridge rectifier BD is connected to the power - supply input terminal IN + through a magnetic bead L1. The output end of the full - bridge rectifier BD is connected to the signal VCC output terminal and one end of the capacitor C1. The other end of the capacitor C1 is grounded. The other ends of the transient - voltage suppressor diode TVS and the full - bridge rectifier BD are grounded through a magnetic bead L2. This module realizes rectification, filtering, and surge - voltage prevention for the signal VCC through devices such as the transient - voltage suppressor diode TVS, the full - bridge rectifier BD, the magnetic bead, and the capacitor C1. At the same time, the input and protection module 1 also includes a voltage - monitoring circuit. The voltage - monitoring circuit is connected to the output end of the full - bridge rectifier BD, and the voltage - monitoring circuit outputs a real - time analog voltage signal T1 after voltage division through resistors R1 and R1.

[0034] Further, in order to convert the signal VCC into a constant voltage power supply signal VDD, as Figure 3 shown, the power supply module 2 includes a DC / DC converter. The input end of the DC / DC converter is connected to the power supply output end VCC. The signal VCC output by the input and protection module 1 is used as the input of the DC / DC converter. Through the DC / DC converter with a wide voltage range and its external configuration circuit, the DC signal VCC with different voltage values is converted into a constant voltage power supply signal VDD, and then the constant voltage power supply signal VDD is used as the working power supply of the single-chip microcomputer drive control module 3.

[0035] As Figure 4 shown, the single-chip microcomputer drive control module 3 includes a PIC single-chip microcomputer. An ADC conversion circuit is provided inside the PIC single-chip microcomputer. The port 1 of the PIC single-chip microcomputer is connected to the constant voltage power supply signal VDD; the port 2 of the PIC single-chip microcomputer is connected to the analog voltage signal T1, and digital voltage signals T2 and T3 are respectively output at ports 5 and 6 through the ADC conversion circuit. The PIC single-chip microcomputer monitors the power supply voltage in real time. Through its internal high-precision ADC port, the analog voltage signal T1 is converted into a digital signal. This digital signal is processed by the program algorithm inside the single-chip microcomputer and the control signals T2 and T3 are output in real time. It is connected to the dual-coil control module 4 through ports 5 and 6 to achieve the energy-saving control of the dual-coil control module 4. It should be noted that the digital identifiers such as port 2, port 5, and port 6 of the single-chip microcomputer in this embodiment are only for convenient reading and are not the single-chip microcomputer ports that must use this fixed digital identifier; in practical applications, the single-chip microcomputer ports with any digital identifier, as long as they have functions such as completing ADC conversion or outputting corresponding voltage signals, can be freely selected and used in applications to achieve functions such as ADC conversion or outputting voltage signals in this circuit application.

[0036] In order to implement a dual-coil parallel energy-saving circuit, as Figure 5 shown, the dual-coil control module 4 includes a coil CC, a coil HC, an MOS transistor Q2, and an MOS transistor Q3. One end of the coil CC and the coil HC is connected to the signal VCC; the other end of the coil CC is connected to the drain of the MOS transistor Q3, and the other end of the coil HC is connected in series with the drain of the MOS transistor Q2. The gate of the MOS transistor Q2 is connected to the digital voltage drive signal T2, and the gate of the MOS transistor Q3 is connected to the digital voltage signal T3. The sources of the MOS transistor Q2 and the MOS transistor Q3 are grounded. Among them, the on and off of the two MOS transistors respectively control the power-on or power-off of the coil CC and the coil HC. Since the two coils are conducted in parallel and work simultaneously at the startup stage, for this reason, this circuit is called a dual-coil parallel energy-saving circuit.

[0037] Specifically, in the double-coil parallel energy-saving circuit, the startup phase is as follows: The gates of MOS transistor Q2 and MOS transistor Q3 simultaneously receive high-level drive signals T2 and T3. MOS transistor Q2 and MOS transistor Q3 conduct simultaneously, forming a double-coil energized startup. When switching from the startup phase to the holding phase, when the microcontroller drive control module 3 outputs the turn-off voltage signal (low level) T3 of MOS transistor Q3 at port 5, MOS transistor Q3 turns off, the coil CC turns off, and only the coil HC is in the working state, forming a single-coil hold. At this time, the relay or contactor enters the holding phase, and the relay or contactor is in an energy-saving state.

[0038] Specifically, the constant voltage power supply signal VDD provided by the power supply module 2 serves as the power supply signal for the microcontroller drive control module 3, providing a stable voltage for the reliable operation of the microcontroller. After the PIC microcontroller works, its internal software program controls its ports 2, 5, and 6 in real time. As input or output ports, their main functions are to monitor the power supply voltage and output control voltage signals:

[0039] Port 2 of the PIC microcontroller is configured as an input port by software, and ports 5 and 6 are configured as output ports by software. Port 2 uses its internal ADC conversion circuit to convert the analog power supply voltage signal T1 output from the input and protection module 1 into a digital signal in real time. After performing certain algorithm processing on this digital signal, digital voltage signals T2 and T3 are output in a certain timing logic and are output to the gates of MOS transistor Q2 and MOS transistor Q3 in the double-coil control module 4 through ports 5 and 6, realizing the control of the conduction and turn-off of the circuits where the startup moving coil CC and the holding coil HC are located, and realizing the energy-saving control of the energy-saving circuit. Among them, in the microcontroller drive control module 3, current-limiting circuits are respectively set between ports 5, 6 and the gates of MOS transistor Q2 and MOS transistor Q3. The current-limiting circuits are respectively R3 and R4 connected between port 6 and the gate of MOS transistor Q2, and R5 and R6 connected between port 5 and the gate of MOS transistor Q3. The current-limiting circuits play the role of current-limiting and discharging, making the MOS transistor gate current small, and at the same time minimizing the influence of the parasitic capacitance between the gate and drain of the MOS transistor on the turn-off time of the relay or contactor.

[0040] To achieve the ability to suppress the reverse voltage generated by the coil, the dual-coil control module 4 further includes a first discharge circuit 41 connected in parallel with the coil CC and the coil HC respectively. The first discharge circuit 41 includes a zener diode D1 and an antiparallel diode D2 connected in parallel with the coil CC, and a zener diode D3 and an antiparallel diode D4 connected in parallel with the coil HC. One end of the zener diode D1 is connected to one end of the coil CC, and the other end is connected to one end of the antiparallel diode D2. The other end of the antiparallel diode D2 is connected to the other end of the coil CC. One end of the zener diode D3 is connected to one end of the coil HC, and the other end is connected to one end of the antiparallel diode D4. The other end of the antiparallel diode D4 is connected to the other end of the coil HC. The coil is an inductive load, and the extremely high reverse voltage during power-off can seriously damage the external control circuit. Through the discharge circuit, the reverse voltage of the dual-coil is reduced to minimize the interference to the external control circuit and achieve rapid turn-off, reducing the contact arcing situation and greatly extending the service life of the relay or contactor.

[0041] In the PIC microcontroller control program, the software program flow inside the PIC microcontroller is divided into 4 stages: A startup stage, B hold stage, C turn-off stage, and D abnormal stage. As Figure 8 shown, in the A startup stage, the power supply voltage is detected and it is judged whether it is greater than the startup voltage. If it is not greater than the startup voltage, continuous real-time detection is continued. If it is greater than the startup voltage, it is further judged whether it is greater than the maximum operating voltage. If it is greater than the maximum operating voltage, all drive signals are turned off. If it is not greater than the maximum operating voltage, the startup coil delay time is calculated, and then the drive signal is output to energize the coil to realize the startup of the relay or contactor. When the delay ends, it enters the B hold stage. In the B hold stage, by outputting the hold drive signal, the startup coil is turned off and the hold coil works. During the entire hold stage, the voltage is continuously detected to judge whether the power supply voltage is lower than the turn-off voltage. If it is lower than the turn-off voltage, all drive signals are turned off, and this is the C turn-off stage at this time. If it is not lower than the turn-off voltage, it enters the D abnormal stage. In the D abnormal stage, it is judged whether the voltage is greater than the maximum operating voltage. If it is greater than the maximum operating voltage, all drive signals are turned off. If it is not greater than the maximum operating voltage, it is judged whether it is lower than the safety voltage. If it is not lower than the safety voltage, the hold drive signal is continuously output. If it is lower than the safety voltage, it returns to the A startup stage to judge whether it is greater than the maximum operating voltage. Under complex power supply external characteristics, it has strong dynamic voltage monitoring, abnormal characteristic detection, and power adjustment capabilities, and at the same time realizes highly reliable working capabilities under adverse power supply external characteristics such as overvoltage and undervoltage.

[0042] Embodiment 2

[0043] This embodiment provides an energy-saving control circuit with a series-connected dual-coil hold, as Figure 6As shown, it also includes an input and protection module 1, a power supply module 2, a single-chip microcomputer drive control module 3, and a dual-coil control module 4. The dual-coil control module 4 also includes a coil CC, a coil HC, a MOS transistor Q2, and a MOS transistor Q3.

[0044] Different from Embodiment 1, as Figure 7 shown, one end of the coil CC is connected to the signal VCC, and the other end of the coil CC is connected to the series circuit of the coil HC and the MOS transistor Q2. The MOS transistor Q3 is connected in parallel across the series circuit of the coil HC and the MOS transistor Q2. The gate of the MOS transistor Q2 is connected to the digital voltage signal T2, and the gate of the MOS transistor Q3 is connected to the digital voltage signal T3. The sources of the MOS transistor Q2 and the MOS transistor Q3 are grounded.

[0045] In the series dual-coil energy-saving circuit, during the startup phase, the gates of the MOS transistor Q2 and the MOS transistor Q3 simultaneously receive the driving voltage signals of high level T3 and T2, and the two MOS transistors are turned on simultaneously. Since the MOS transistor Q3 is turned on, the series circuit of the HC coil and the MOS transistor Q2 is in an approximate short-circuit state, and the relay or contactor forms a single-coil startup. When switching from the startup phase to the holding phase, when the port 5 of the single-chip microcomputer drive control module 3 outputs the turn-off voltage signal (low level) T3 of the MOS transistor Q3, the MOS transistor Q3 is turned off, forming a series circuit of the coil CC, the HC coil, and the MOS transistor Q2. The coil CC and the coil HC work simultaneously, forming a dual-coil holding in a series structure. At this time, the relay or contactor enters the energy-saving holding state.

[0046] Among them, the series dual-coil energy-saving circuit also includes a second discharge circuit 42. The second discharge circuit 42 is connected in parallel with the series-connected coil CC and coil HC. The second discharge circuit includes a zener diode D5 and an anti-parallel diode D6. One end of the zener diode D5 is connected to the coil CC, and the other end is connected to one end of the anti-parallel diode D6. The other end of the anti-parallel diode D6 is connected to the coil HC, which can further realize the function of suppressing the turn-off reverse voltage, reduce the contact arcing situation, reduce the number of contact bounce times, and extend the service life of the relay or contactor.

[0047] To sum up, this circuit adopts a modular design, and the circuit structure is simple. In terms of function expansion, it uses a digital method to control the analog circuit, and new functions can be realized only through software programming. It is realized by using the digital single-chip microcomputer control technology with two dual-coil structures (parallel and series). Through a suitable circuit and the internal software program algorithm of the single-chip microcomputer, the dual-coil structure relay or contactor can achieve real-time dynamic energy-saving control under different power supply external characteristics. By separately designing two energy-saving circuits suitable for the parallel dual-coil and the series dual-coil, the design flexibility is improved, the energy-saving function under different coil structures is realized, the design difficulty and cost are reduced, and the technical effects achieved are:

[0048] 1. It reduces the design difficulty and cost, and can ensure the delay accuracy. The energy-saving dual-coil control circuit inherits the intelligent features, general circuit functions, and strong expandability of the single-chip microcomputer control circuit.

[0049] 2. Under complex power supply external characteristics, it has strong capabilities in dynamic voltage and power monitoring, abnormal characteristic detection, and power adjustment. At the same time, it can achieve highly reliable operation under adverse power supply external characteristics such as overvoltage and undervoltage.

[0050] 3. It improves the design flexibility. When there are different power consumption requirements, coil parameters, or volume limitations, there is no need to redesign the circuit. The debugging of circuit building and working point setting is simple. By using digital control of analog circuits, new functions can be achieved only through software programming.

[0051] The above-described embodiments do not constitute a limitation on the protection scope of the technical solution. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the above embodiments shall be included in the protection scope of the technical solution.

Claims

1. A double-coil energy-saving control circuit, characterized in that: It includes an input and protection module, which is used to rectify, filter and protect against surge for the input power supply and output the signal VCC; Power supply module: connected to the output end of the input and protection module, used to convert the signal VCC into a constant voltage power supply signal VDD; Dual-coil control module: used to control the startup and shutdown of the dual coils according to a certain timing or electrical conditions to achieve energy-saving control; Single-chip microcomputer drive control module: connected to the power supply module and the dual-coil control module, used to monitor the signal VCC in real time and control the dual-coil control module to turn on and off energy saving; The input and protection module includes a power input terminal IN+, a transient voltage suppression diode TVS, a full-bridge rectifier BD, a magnetic bead L1, a magnetic bead L2 and a capacitor C1, as well as a power output terminal VCC for outputting the signal VCC; One end of the magnetic bead L1 and the magnetic bead L2 are respectively connected to the power input terminal IN+ and the ground, one end of the transient voltage suppression diode TVS and the full-bridge rectifier BD is connected to the magnetic bead L1, and the other end is connected to the magnetic bead L2, and the output end of the full-bridge rectifier BD is connected to the power output terminal VCC and the capacitor C1; The input and protection module includes a voltage monitoring circuit, and the voltage monitoring circuit is connected to the output end of the full-bridge rectifier BD and outputs a real-time analog voltage signal T1; The power supply module includes a DC / DC converter; The input end of the DC / DC converter is connected to the power output terminal VCC and outputs the constant voltage power supply signal VDD at its output end; The single-chip microcomputer drive control module includes a PIC single-chip microcomputer, an ADC conversion circuit is arranged inside the PIC single-chip microcomputer, and the port 1 of the PIC single-chip microcomputer is connected to the constant voltage power supply signal VDD; The port 2 of the PIC single-chip microcomputer is connected to the analog voltage signal T1, and digital voltage signals T2 and T3 are respectively output at port 5 and port 6 through the ADC conversion circuit; The dual-coil control module includes a coil CC, a coil HC, a MOS transistor Q2 and a MOS transistor Q3, and one end of the coil CC and the coil HC is connected to the power output terminal VCC; The other end of the coil CC is connected in series with the drain of the MOS transistor Q3, and the other end of the coil HC is connected in series with the drain of the MOS transistor Q2; The gate of the MOS transistor Q2 is connected to the digital voltage signal T2; The gate of the MOS transistor Q3 is connected to the digital voltage signal T3, and the source of the MOS transistor Q2 and the source of the MOS transistor Q3 are both grounded; Current-limiting circuits are respectively arranged between port 5 and the gate of the MOS transistor Q3 and between port 6 and the gate of the MOS transistor Q2; The dual-coil control module also includes a first discharge circuit connected in parallel with the coil CC and the coil HC; The first discharge circuit includes a zener diode and an antiparallel diode, one end of the zener diode is connected to one end of the coil CC or the coil HC, and the other end is connected to one end of the antiparallel diode; The other end of the antiparallel diode is connected to the other end of the coil CC or the coil HC.

2. The double-coil energy-saving control circuit according to claim 1, characterized in that: It further includes a second discharging circuit, and the second discharging circuit is connected in parallel with the circuit formed by the series connection of the coil CC and the coil HC; the second discharging circuit includes a zener diode D5 and an anti-parallel diode D6, one end of the zener diode D5 is connected to the power supply output terminal VCC, and the other end is connected to one end of the anti-parallel diode D6; the other end of the anti-parallel diode D6 is connected to the drain of the MOS transistor Q2.

Images