CN108156681B - Electromagnetic coil driving circuit - Google Patents

Electromagnetic coil driving circuit Download PDF

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Publication number
CN108156681B
CN108156681B CN201711383498.4A CN201711383498A CN108156681B CN 108156681 B CN108156681 B CN 108156681B CN 201711383498 A CN201711383498 A CN 201711383498A CN 108156681 B CN108156681 B CN 108156681B
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circuit
capacitor
resistor
diode
voltage
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CN108156681A (en
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张学功
洪小清
颜善茂
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Xiamen Z&h Electronic Technology Co ltd
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Xiamen Z&h Electronic Technology Co ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202—Switches
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses an electromagnetic coil driving circuit which comprises an EMI filter circuit, a bridge rectifier circuit, a DC/DC voltage reduction circuit, a detection circuit, a control module and a switch circuit, wherein the bridge rectifier circuit is connected with the EMI filter circuit; the EMI filter circuit filters the voltage input into the electromagnetic coil driving circuit; the bridge rectifier circuit rectifies the voltage filtered by the EMI filter circuit; the DC/DC voltage reduction circuit reduces the voltage rectified by the bridge rectifier circuit; the detection circuit detects the voltage rectified by the bridge rectifier circuit and outputs the voltage to the control module; the control module controls whether to output a PWM signal to a control end of the switching circuit according to the voltage rectified by the bridge rectifying circuit; the switching circuit modulates the voltage which is reduced by the DC/DC voltage reducing circuit according to the PWM signal so as to output a rectangular wave voltage signal to the electromagnetic coil. The invention has better EMI performance and can ensure the stable operation of the electromagnetic coil.

Description

Electromagnetic coil driving circuit
Technical Field
The invention relates to the technical field of circuits, in particular to an electromagnetic coil driving circuit.
Background
In the prior art, the electromagnetic valve or the relay is operated by externally applying voltage, the operating mode is that voltage is applied to two ends of an electromagnetic coil of the electromagnetic valve or the relay to generate magnetic force to control the movement of the electromagnetic valve, the operating voltage of the electromagnetic coil needs to be controlled at a certain level, if the operating voltage value of the electromagnetic coil is higher, more heat is easily generated, the operating environment temperature of the electromagnetic valve or the relay is increased, the stability and the service life of the electromagnetic valve and surrounding parts of the electromagnetic valve are further influenced, and therefore, people adopt various methods to reduce the operating current of the electromagnetic valve, and further reduce the heat generated during the operation of the electromagnetic valve.
In the prior art, an MOS tube module is arranged between a power supply and an electromagnetic coil, a control module detects the output voltage of the power supply through a detection circuit to control the duty ratio of PWM signals input to the MOS tube module, and when the output voltage of the power supply is higher, the duty ratio of the PWM signals output by the control module is smaller, so that the working current of the electromagnetic coil is reduced, the power consumption of the electromagnetic coil is reduced, and the heating of the electromagnetic coil is avoided; the control mode can enable the suction capacity of the electromagnetic coil to change along with the change of the output voltage of the power supply, so that the work stability of the electromagnetic coil is poor, and the circuit of the control mode does not filter the power supply, so that the conduction radiation of the electromagnetic coil is large, and the national standard is difficult to reach.
Disclosure of Invention
The invention aims to provide a driving circuit for driving an electromagnetic coil, which is used for overcoming the defects of the prior electromagnetic coil, has good EMI performance and can ensure that the electromagnetic coil works stably.
In order to achieve the above object, the solution of the present invention is:
an electromagnetic coil driving circuit comprises an EMI filter circuit, a bridge rectifier circuit, a DC/DC voltage reduction circuit, a detection circuit, a control module and a switch circuit; wherein the EMI filter circuit is used for filtering the voltage input into the electromagnetic coil driving circuit; the bridge rectifier circuit is connected with the output end of the EMI filter circuit and used for rectifying the voltage filtered by the EMI filter circuit; the DC/DC voltage reduction circuit is connected with the output end of the bridge rectifier circuit and is used for reducing the voltage rectified by the bridge rectifier circuit; the detection circuit is connected with the output end of the bridge rectifier circuit and is used for detecting the voltage rectified by the bridge rectifier circuit; the control module is respectively connected with the output end of the detection circuit and the control end of the switching circuit and is used for controlling whether to output a PWM signal with fixed frequency to the control end of the switching circuit according to the voltage rectified by the bridge rectifier circuit; the switching circuit is connected with the output end of the DC/DC voltage reduction circuit and used for modulating the voltage reduced by the DC/DC voltage reduction circuit according to the PWM signal of the control module so as to output a rectangular wave voltage signal to the electromagnetic coil.
The electromagnetic coil driving circuit further comprises an LDO voltage stabilizing circuit, wherein the input end of the LDO voltage stabilizing circuit is connected with the output end of the DC/DC voltage reducing circuit, and the output end of the LDO voltage stabilizing circuit is connected with the power end of the control module.
The EMI filter circuit comprises an inductor L1, a capacitor C1 and a capacitor C2; one end of the inductor L1 is a first input end of the EMI filter circuit, the other end of the inductor L1 is a first output end of the EMI filter circuit, one end of the capacitor C1 is connected with the first input end of the EMI filter circuit, the other end of the capacitor C1 is a second input end of the EMI filter circuit, one end of the capacitor C2 is connected with the first output end of the EMI filter circuit, the other end of the capacitor C1 is a second output end of the EMI filter circuit, and the other end of the capacitor C1 is connected with the other end of the capacitor C1.
The bridge rectifier circuit comprises a diode D1, a diode D2, a diode D3 and a diode D4, wherein the anode of the diode D1 and the cathode of the diode D2 are connected with the first output end of the EMI filter circuit, the cathode of the diode D1 is the output end of the bridge rectifier circuit, the cathode of the diode D1 is connected with the cathode of the diode D4, and the anode of the diode D2 is connected with the anode of the diode D3 and grounded; the cathode of the diode D3 and the anode of the diode D4 are connected to the second output terminal of the EMI filter circuit.
The DC/DC voltage reduction circuit comprises a DC/DC voltage reduction chip U1, a resistor R2, a resistor R3, a resistor R4, a capacitor C3A, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, an inductor L2 and a diode D5; one end of the capacitor C3, one end of the capacitor C3A and the VIN pin of the DC/DC buck chip U1 are connected with the output end of the bridge rectifier circuit; the EN pin of the DC/DC buck chip U1 is suspended, the FREQ pin of the DC/DC buck chip U1 is connected with one end of a resistor R1, the BST pin of the DC/DC buck chip U1 is connected with one end of a capacitor C5, the SW pin of the DC/DC buck chip U1 is connected with the other end of the capacitor C5, the negative electrode of a diode D5 and one end of an inductor L2, and the FB pin of the DC/DC buck chip U1 is connected with one end of a resistor R4 and one end of a resistor R3; the COMP pin of the DC/DC voltage reduction chip U1 is connected with one end of a capacitor C4, the other end of the capacitor C4 is connected with one end of a resistor R2, the other end of an inductor L2 and the other end of the resistor R4 are connected with one end of a capacitor C6, and the other end of the inductor L2 is an output end for DC/DC voltage reduction; the GND pin of the DC/DC buck chip U1, the other end of the capacitor C3A, the other end of the resistor R1, the other end of the resistor R2, the other end of the resistor R3, the other end of the capacitor C6 and the anode of the diode D5 are grounded.
The DC/DC voltage reduction circuit further comprises a resistor R12, a capacitor C41 and a capacitor C7, wherein one end of the resistor R12 is connected with the cathode of the diode D5, the other end of the resistor R12 is connected with one end of the capacitor C41, and the other end of the capacitor C41 is grounded; one end of the capacitor C7 is connected with the COMP pin of the DC/DC buck chip U1, and the other end of the capacitor C7 is grounded.
The detection circuit comprises a resistor R5, a resistor R6 and a capacitor C10; one end of the resistor R5 is connected with the output end of the bridge rectifier circuit, and the other end of the resistor R5 is connected with one end of the capacitor C10 and one end of the resistor R6; the other end of the capacitor C10 is grounded with the other end of the resistor R6, and the other end of the resistor R5 is used as the output end of the detection circuit.
The output end of the detection circuit is connected with the control module through a resistor R7.
The switching circuit comprises an NMOS tube Q1, an NMOS tube Q2, a diode D6, a diode D7, a resistor R8, a resistor R9 and a capacitor C12; the positive electrode of the diode D6 is connected with the negative electrode of the diode D7 and the output end of the DC/DC voltage reduction circuit, the positive electrode of the diode D6 is a first output end of the switch circuit, the negative electrode of the diode D6 is connected with one end of a resistor R8, and the other end of the resistor R8 is connected with one end of a resistor R9, one end of a capacitor C12 and the grid electrode of an NMOS tube Q1; the other end of the resistor R9 is connected with the anode of the diode D7, the other end of the capacitor C12, the source electrode of the NMOS tube Q1 and the drain electrode of the NMOS tube Q2, and the drain electrode of the NMOS tube Q1 is the second output end of the switching circuit; the grid of the NMOS tube Q2 is connected with the control module, the grid of the NMOS tube Q2 is the control end of the switch circuit, and the source electrode of the NMOS tube Q2 is grounded.
The switching circuit further comprises a zener diode ZD1, the cathode of the zener diode ZD1 is connected with the grid electrode of the NMOS tube Q1, and the anode of the zener diode ZD1 is connected with the source electrode of the NMOS tube Q1.
The grid electrode of the NMOS tube Q2 is connected with the control module through a voltage dividing circuit; the voltage dividing circuit comprises a resistor R10 and a resistor R11, one end of the resistor R10 is connected with the control module, the other end of the resistor R10 is connected with one end of the resistor R11 and the grid electrode of the NMOS tube Q2, and the other end of the resistor R11 is grounded.
The output end of the DC/DC voltage reduction circuit is connected with the positive electrode of the diode D6 through the diode D8, the positive electrode of the diode D8 is connected with the output end of the DC/DC voltage reduction circuit, and the negative electrode of the diode D8 is connected with the positive electrode of the diode D6.
After the scheme is adopted, the invention has the following advantages:
1. the bridge rectifier circuit is arranged, so that the invention can adopt alternating current power supply and direct current power supply, and has good applicability;
2. the EMI filter circuit is arranged, so that the EMI performance of the invention is good;
3. the invention controls the control module to output PWM signal with fixed frequency to the control end of the switch circuit by detecting the voltage value rectified by the bridge rectifying circuit through the detecting circuit, so that the control module can not output PWM signal to the switch circuit when the voltage input to the invention is too high or too low, and the switch circuit stops working, thereby having overvoltage protection function and undervoltage protection function;
4. the invention reduces the voltage rectified by the bridge rectifier circuit through the DC/DC voltage reduction circuit, the control module outputs a PWM signal with fixed frequency to the switch circuit, and the switch circuit modulates the voltage reduced by the DC/DC voltage reduction circuit according to the PWM signal of the control module to output a rectangular wave voltage signal to the electromagnetic coil, so that the amplitude and the duty ratio of the rectangular wave voltage signal are kept stable, the suction capacity of the electromagnetic coil is stable, and the work of the electromagnetic coil is stable.
Drawings
FIG. 1 is a schematic block diagram of the present invention
Fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
In order to further explain the technical scheme of the invention, the invention is explained in detail by specific examples.
As shown in fig. 1 and 2, an electromagnetic coil driving circuit of the present invention includes an EMI filter circuit, a bridge rectifier circuit, a DC/DC step-down circuit, a detection circuit, a control module, and a switching circuit.
The EMI filter circuit is configured to filter the voltage input to the electromagnetic coil driving circuit, as shown in fig. 2. Specifically, the EMI filter circuit has two input ends and two output ends, and the EMI filter circuit includes an inductor L1, a capacitor C1 and a capacitor C2; one end of the inductor L1 is a first input end of the EMI filter circuit, and the other end of the inductor L1 is a first output end of the EMI filter circuit; one end of the capacitor C1 is connected with the first input end of the EMI filter circuit, the other end of the capacitor C1 is the second input end of the EMI filter circuit, one end of the capacitor C2 is connected with the first output end of the EMI filter circuit, the other end of the capacitor C1 is the second output end of the EMI filter circuit, and the other end of the capacitor C1 is connected with the other end of the capacitor C1.
The bridge rectifier circuit is connected with the output end of the EMI filter circuit and used for rectifying the voltage filtered by the EMI filter circuit. Specifically, the bridge rectifier circuit includes a diode D1, a diode D2, a diode D3, and a diode D4, where an anode of the diode D1 and a cathode of the diode D2 are connected to the first output end of the EMI filter circuit, a cathode of the diode D1 is an output end of the bridge rectifier circuit, a cathode of the diode D1 is connected to a cathode of the diode D4, and an anode of the diode D2 is connected to an anode of the diode D3 and grounded; the cathode of the diode D3 and the anode of the diode D4 are connected with the second output end of the EMI filter circuit; the bridge rectifier circuit is not limited to include diode D1, diode D2, diode D3, and diode D4, and may be an integrated rectifier bridge stack.
The DC/DC voltage reducing circuit is connected with the output end of the bridge rectifying circuit and used for reducing the voltage rectified by the bridge rectifying circuit. Specifically, the DC/DC voltage reducing circuit includes a DC/DC voltage reducing chip U1, a resistor R2, a resistor R3, a resistor R4, a capacitor C3A, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, an inductor L2, and a diode D5; the type of the DC/DC buck chip U1 can be MP4560DN, MP4559DN or MP4558DN. One end of the capacitor C3, one end of the capacitor C3A and the VIN pin of the DC/DC buck chip U1 are connected with the output end of the bridge rectifier circuit; the EN pin of the DC/DC buck chip U1 is suspended, the FREQ pin of the DC/DC buck chip U1 is connected with one end of a resistor R1, the BST pin of the DC/DC buck chip U1 is connected with one end of a capacitor C5, the SW pin of the DC/DC buck chip U1 is connected with the other end of the capacitor C5, the negative electrode of a diode D5 and one end of an inductor L2, and the FB pin of the DC/DC buck chip U1 is connected with one end of a resistor R4 and one end of a resistor R3; the COMP pin of the DC/DC voltage reduction chip U1 is connected with one end of a capacitor C4, the other end of the capacitor C4 is connected with one end of a resistor R2, the other end of an inductor L2 and the other end of the resistor R4 are connected with one end of a capacitor C6, and the other end of the inductor L2 is an output end for DC/DC voltage reduction; the GND pin of the DC/DC buck chip U1, the other end of the capacitor C3A, the other end of the resistor R1, the other end of the resistor R2, the other end of the resistor R3, the other end of the capacitor C6 and the anode of the diode D5 are grounded. Further, the DC/DC step-down circuit further includes a resistor R12 and a capacitor C41, one end of the resistor R12 is connected to the cathode of the diode D5, the other end of the resistor R12 is connected to one end of the capacitor C41, the other end of the capacitor C41 is grounded, the diode D5 can be protected by the resistor R12 and the capacitor C41, and the diode D5 is prevented from being damaged due to overvoltage. The DC/DC voltage reduction circuit also comprises a capacitor C7, one end of the capacitor C7 is connected with the COMP pin of the DC/DC voltage reduction chip U1, and the other end of the capacitor C7 is grounded.
The detection circuit is connected with the output end of the bridge rectifier circuit and is used for detecting the voltage rectified by the bridge rectifier circuit. Specifically, the detection circuit includes a resistor R5, a resistor R6, and a capacitor C10; one end of the resistor R5 is connected with the output end of the bridge rectifier circuit, the other end of the resistor R5 is connected with one end of the capacitor C10, and one end of the resistor R6 is connected; the other end of the capacitor C10 is grounded with the other end of the resistor R6, and the other end of the resistor R5 is used as the output end of the detection circuit.
The control module is respectively connected with the output end of the detection circuit and the control end of the switching circuit and is used for controlling whether to output a PWM signal with fixed frequency to the control end of the switching circuit according to the voltage rectified by the bridge rectifier circuit; the control module can be a singlechip with an ADC (analog to digital converter) built-in, such as PIC12F1501-E, PIC12F683-E. A resistor R7 can be connected in series between the output end of the detection circuit and the control module, and current is limited through the resistor R7 to protect the control module.
The switching circuit is connected with the output end of the DC/DC voltage reduction circuit and used for modulating the voltage reduced by the DC/DC voltage reduction circuit according to the PWM signal of the control module so as to output a rectangular wave voltage signal. Specifically, the switching circuit includes an NMOS transistor Q1, an NMOS transistor Q2, a diode D6, a diode D7, a resistor R8, a resistor R9, and a capacitor C12; the positive electrode of the diode D6 is connected with the negative electrode of the diode D7 and the output end of the DC/DC voltage reduction circuit, the positive electrode of the diode D6 is a first output end of the switch circuit, the negative electrode of the diode D6 is connected with one end of a resistor R8, and the other end of the resistor R8 is connected with one end of a resistor R9, one end of a capacitor C12 and the grid electrode of an NMOS tube Q1; the other end of the resistor R9 is connected with the anode of the diode D7, the other end of the capacitor C12, the source electrode of the NMOS tube Q1 and the drain electrode of the NMOS tube Q2, and the drain electrode of the NMOS tube Q1 is the second output end of the switching circuit; the grid of the NMOS tube Q2 is connected with the control module, the grid of the NMOS tube Q2 is the control end of the switch circuit, and the source electrode of the NMOS tube Q2 is grounded. The grid electrode of the NMOS tube Q2 can be connected with the control module through a voltage dividing circuit so as to protect the NMOS tube Q2; the voltage dividing circuit comprises a resistor R10 and a resistor R11, one end of the resistor R10 is connected with the control module, the other end of the resistor R10 is connected with the resistor R11 and the grid electrode of the NMOS tube Q2, and the other end of the resistor R11 is grounded. The output end of the DC/DC voltage reduction circuit can be connected with the positive electrode of the diode D6 through the diode D8, the positive electrode of the diode D8 is connected with the output end of the DC/DC voltage reduction circuit, the negative electrode of the diode D8 is connected with the positive electrode of the diode D6, and the influence on the normal operation of the DC/DC voltage reduction circuit during the on-off of a follow-up electromagnetic coil can be avoided through the diode D8. Further, the switching circuit may further include a zener diode ZD1, where a cathode of the zener diode ZD1 is connected to a gate of the NMOS transistor Q1, an anode of the zener diode ZD1 is connected to a source of the NMOS transistor Q1, and a gate voltage of the NMOS transistor Q1 may be controlled through the zener diode ZD1, so as to protect the NMOS transistor Q1.
Further, the electromagnetic coil driving circuit further comprises an LDO voltage stabilizing circuit, the control module can be powered through the LDO voltage stabilizing circuit, the input end of the LDO voltage stabilizing circuit is connected with the output end of the DC/DC voltage reducing circuit, and the output end of the LDO voltage stabilizing circuit is connected with the power end of the control module; specifically, the LDO voltage stabilizing circuit comprises an LDO voltage stabilizing chip U2 and a capacitor C9, an IN pin of the LDO voltage stabilizing chip U2 is connected with an output end of the DC/DC voltage reducing circuit, an OUT pin of the LDO voltage stabilizing chip U2 is connected with a power end of the control module and one end of the capacitor C9, a GND pin of the voltage stabilizing chip U2 and the other end of the capacitor C9 are grounded, and the LDO voltage stabilizing chip U2 can be NCV51460-D or ZMR33Q.
When the electromagnetic coil driving circuit is implemented, the output voltage of the power supply is input into the electromagnetic coil driving circuit, filtered by the EMI filter circuit and the bridge rectifier circuit, rectified and then input into the DC/DC voltage reduction circuit, the control module detects the voltage rectified by the bridge rectifier circuit through the detection circuit, and if the rectified voltage is between the highest preset value and the lowest preset value, the control module outputs a PWM signal with fixed frequency to enable the switching circuit to start working, and at the moment, the voltage reduced by the DC/DC voltage reduction circuit is modulated by the switching circuit and then output a rectangular wave voltage signal to the electromagnetic coil; if the rectified voltage exceeds the highest preset value or is lower than the lowest preset value, the control module does not output PWM signals, the switching circuit does not work, and the whole circuit does not output.
After the scheme is adopted, the invention has the following advantages:
1. the bridge rectifier circuit is arranged, so that the invention can adopt alternating current power supply and direct current power supply, and has good applicability;
2. the EMI filter circuit is arranged, so that the EMI performance of the invention is good;
3. the invention controls the control module to output PWM signal with fixed frequency to the control end of the switch circuit by detecting the voltage value rectified by the bridge rectifying circuit through the detecting circuit, so that the control module can not output PWM signal to the switch circuit when the voltage input to the invention is too high or too low, and the switch circuit stops working, thereby having overvoltage protection function and undervoltage protection function;
4. the invention reduces the voltage rectified by the bridge rectifier circuit through the DC/DC voltage reduction circuit, the control module outputs a PWM signal with fixed frequency to the switch circuit, and the switch circuit modulates the voltage reduced by the DC/DC voltage reduction circuit according to the PWM signal of the control module to output a rectangular wave voltage signal to the electromagnetic coil, so that the amplitude and the duty ratio of the rectangular wave voltage signal are kept stable, the suction capacity of the electromagnetic coil is stable, and the work of the electromagnetic coil is stable.
The above examples and drawings are not intended to limit the form or form of the present invention, and any suitable variations or modifications thereof by those skilled in the art should be construed as not departing from the scope of the present invention.

Claims (11)

1. An electromagnetic coil drive circuit, characterized in that: the device comprises an EMI filter circuit, a bridge rectifier circuit, a DC/DC voltage reduction circuit, a detection circuit, a control module and a switch circuit; wherein the method comprises the steps of
The EMI filter circuit is used for filtering the voltage input into the electromagnetic coil driving circuit;
the bridge rectifier circuit is connected with the output end of the EMI filter circuit and used for rectifying the voltage filtered by the EMI filter circuit;
the DC/DC voltage reduction circuit is connected with the output end of the bridge rectifier circuit and is used for reducing the voltage rectified by the bridge rectifier circuit;
the detection circuit is connected with the output end of the bridge rectifier circuit and is used for detecting the voltage rectified by the bridge rectifier circuit;
the control module is respectively connected with the output end of the detection circuit and the control end of the switching circuit and is used for controlling whether to output a PWM signal with fixed frequency to the control end of the switching circuit according to the voltage rectified by the bridge rectifier circuit;
the switching circuit is connected with the output end of the DC/DC voltage reduction circuit and is used for modulating the voltage reduced by the DC/DC voltage reduction circuit according to the PWM signal of the control module so as to output a rectangular wave voltage signal to the electromagnetic coil; the switching circuit comprises an NMOS tube Q1, an NMOS tube Q2, a diode D6, a diode D7, a resistor R8, a resistor R9 and a capacitor C12; the positive electrode of the diode D6 is connected with the negative electrode of the diode D7 and the output end of the DC/DC voltage reduction circuit, the positive electrode of the diode D6 is a first output end of the switch circuit, the negative electrode of the diode D6 is connected with one end of a resistor R8, and the other end of the resistor R8 is connected with one end of a resistor R9, one end of a capacitor C12 and the grid electrode of an NMOS tube Q1; the other end of the resistor R9 is connected with the anode of the diode D7, the other end of the capacitor C12, the source electrode of the NMOS tube Q1 and the drain electrode of the NMOS tube Q2, and the drain electrode of the NMOS tube Q1 is the second output end of the switching circuit; the grid of the NMOS tube Q2 is connected with the control module, the grid of the NMOS tube Q2 is the control end of the switch circuit, and the source electrode of the NMOS tube Q2 is grounded.
2. The solenoid driver circuit of claim 1, wherein: the LDO voltage stabilizing circuit is characterized by further comprising an LDO voltage stabilizing circuit, wherein the input end of the LDO voltage stabilizing circuit is connected with the output end of the DC/DC voltage reducing circuit, and the output end of the LDO voltage stabilizing circuit is connected with the power end of the control module.
3. The solenoid driver circuit of claim 1, wherein: the EMI filter circuit comprises an inductor L1, a capacitor C1 and a capacitor C2; one end of the inductor L1 is a first input end of the EMI filter circuit, the other end of the inductor L1 is a first output end of the EMI filter circuit, one end of the capacitor C1 is connected with the first input end of the EMI filter circuit, the other end of the capacitor C1 is a second input end of the EMI filter circuit, one end of the capacitor C2 is connected with the first output end of the EMI filter circuit, the other end of the capacitor C1 is a second output end of the EMI filter circuit, and the other end of the capacitor C1 is connected with the other end of the capacitor C1.
4. The solenoid driver circuit of claim 1, wherein: the bridge rectifier circuit comprises a diode D1, a diode D2, a diode D3 and a diode D4, wherein the anode of the diode D1 and the cathode of the diode D2 are connected with the first output end of the EMI filter circuit, the cathode of the diode D1 is the output end of the bridge rectifier circuit, the cathode of the diode D1 is connected with the cathode of the diode D4, and the anode of the diode D2 is connected with the anode of the diode D3 and grounded; the cathode of the diode D3 and the anode of the diode D4 are connected to the second output terminal of the EMI filter circuit.
5. The solenoid driver circuit of claim 1, wherein: the DC/DC voltage reduction circuit comprises a DC/DC voltage reduction chip U1, a resistor R2, a resistor R3, a resistor R4, a capacitor C3A, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, an inductor L2 and a diode D5; one end of the capacitor C3, one end of the capacitor C3A and the VIN pin of the DC/DC buck chip U1 are connected with the output end of the bridge rectifier circuit; the EN pin of the DC/DC buck chip U1 is suspended, the FREQ pin of the DC/DC buck chip U1 is connected with one end of a resistor R1, the BST pin of the DC/DC buck chip U1 is connected with one end of a capacitor C5, the SW pin of the DC/DC buck chip U1 is connected with the other end of the capacitor C5, the negative electrode of a diode D5 and one end of an inductor L2, and the FB pin of the DC/DC buck chip U1 is connected with one end of a resistor R4 and one end of a resistor R3; the COMP pin of the DC/DC voltage reduction chip U1 is connected with one end of a capacitor C4, the other end of the capacitor C4 is connected with one end of a resistor R2, the other end of an inductor L2 and the other end of the resistor R4 are connected with one end of a capacitor C6, and the other end of the inductor L2 is an output end for DC/DC voltage reduction; the GND pin of the DC/DC buck chip U1, the other end of the capacitor C3A, the other end of the resistor R1, the other end of the resistor R2, the other end of the resistor R3, the other end of the capacitor C6 and the anode of the diode D5 are grounded.
6. The solenoid driver circuit of claim 5, wherein: the DC/DC voltage reduction circuit further comprises a resistor R12, a capacitor C41 and a capacitor C7, wherein one end of the resistor R12 is connected with the cathode of the diode D5, the other end of the resistor R12 is connected with one end of the capacitor C41, and the other end of the capacitor C41 is grounded; one end of the capacitor C7 is connected with the COMP pin of the DC/DC buck chip U1, and the other end of the capacitor C7 is grounded.
7. The solenoid driver circuit of claim 1, wherein: the detection circuit comprises a resistor R5, a resistor R6 and a capacitor C10; one end of the resistor R5 is connected with the output end of the bridge rectifier circuit, and the other end of the resistor R5 is connected with one end of the capacitor C10 and one end of the resistor R6; the other end of the capacitor C10 is grounded with the other end of the resistor R6, and the other end of the resistor R5 is used as the output end of the detection circuit.
8. The solenoid driver circuit of claim 7, wherein: the output end of the detection circuit is connected with the control module through a resistor R7.
9. The solenoid driver circuit of claim 1, wherein: the switching circuit further comprises a zener diode ZD1, the cathode of the zener diode ZD1 is connected with the grid electrode of the NMOS tube Q1, and the anode of the zener diode ZD1 is connected with the source electrode of the NMOS tube Q1.
10. The solenoid driver circuit of claim 1, wherein: the grid electrode of the NMOS tube Q2 is connected with the control module through a voltage dividing circuit; the voltage dividing circuit comprises a resistor R10 and a resistor R11, one end of the resistor R10 is connected with the control module, the other end of the resistor R10 is connected with one end of the resistor R11 and the grid electrode of the NMOS tube Q2, and the other end of the resistor R11 is grounded.
11. The solenoid driver circuit of claim 9, wherein: the output end of the DC/DC voltage reduction circuit is connected with the positive electrode of the diode D6 through the diode D8, the positive electrode of the diode D8 is connected with the output end of the DC/DC voltage reduction circuit, and the negative electrode of the diode D8 is connected with the positive electrode of the diode D6.
CN201711383498.4A 2017-12-20 2017-12-20 Electromagnetic coil driving circuit Active CN108156681B (en)

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CN111442130B (en) * 2020-05-07 2022-03-11 浙江桃园智能科技有限公司 Electromagnetic valve driving circuit
CN111769751A (en) * 2020-05-15 2020-10-13 海信（山东）空调有限公司 Direct current power supply circuit and air conditioner

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104143915A (en) * 2014-07-22 2014-11-12 南京国臣信息自动化技术有限公司 Coil-type load voltage sag protection device
CN205781229U (en) * 2016-04-27 2016-12-07 济南市大秦机电设备有限公司 Electromagnetic valve coil power conditioning circuitry
CN207652717U (en) * 2017-12-20 2018-07-24 厦门著赫电子科技有限公司 A kind of electromagnetic coil driving circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104143915A (en) * 2014-07-22 2014-11-12 南京国臣信息自动化技术有限公司 Coil-type load voltage sag protection device
CN205781229U (en) * 2016-04-27 2016-12-07 济南市大秦机电设备有限公司 Electromagnetic valve coil power conditioning circuitry
CN207652717U (en) * 2017-12-20 2018-07-24 厦门著赫电子科技有限公司 A kind of electromagnetic coil driving circuit

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