CN210599360U - Electromagnetic pump control system - Google Patents
Electromagnetic pump control system Download PDFInfo
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- CN210599360U CN210599360U CN201920885390.3U CN201920885390U CN210599360U CN 210599360 U CN210599360 U CN 210599360U CN 201920885390 U CN201920885390 U CN 201920885390U CN 210599360 U CN210599360 U CN 210599360U
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Abstract
The utility model relates to an electromagnetic pump control system, including zero cross detection circuit, controlling means and output control circuit, controlling means respectively with zero cross detection circuit with the output control circuit electricity is connected, zero cross detection circuit includes the isolator, the input and the alternating current power supply electricity of isolator are connected, the output of isolator with the controlling means electricity is connected, the isolator is used for keeping apart interference signal, output control circuit is connected with the electromagnetic pump electricity. The utility model discloses an adopt the interference signal among the isolator isolation environment among the zero passage detection circuit, can improve the precision of the zero passage signal who gathers, reduce noise signal to improve whole control system's stability and control accuracy.
Description
Technical Field
The utility model relates to an electromagnetic pump control field especially relates to an electromagnetic pump control system.
Background
The electromagnetic pump is a device which utilizes an electromagnetic push rod to drive a diaphragm to reciprocate in a chamber to cause the change of pressure in the chamber, further causes the opening and closing of a liquid suction valve and a liquid discharge valve, and realizes the suction and discharge of liquid. The miniature electromagnetic pump is a plunger pump driven by an electromagnet, has the characteristics of small volume, compact structure, high output pressure, strong sealing property and the like, and is widely applied to small household electrical appliances such as a garment steamer and the like due to the excellent characteristics of the miniature electromagnetic pump. In an existing electromagnetic pump control system, a zero-crossing signal in an alternating current signal is obtained by connecting a divider resistor in series at an output end of an alternating current power supply, and an electromagnetic pump is controlled to work according to the zero-crossing signal. However, when the zero-crossing signal is obtained in the above manner, the zero-crossing signal is easily interfered by high-frequency signals in the environment, for example, the interference of a power grid spike pulse, which results in the reduction of the stability and the control accuracy of the whole control system.
SUMMERY OF THE UTILITY MODEL
To the not enough of above-mentioned prior art, the utility model provides an electromagnetic pump control system.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
the utility model provides an electromagnetic pump control system, a serial communication port, including zero cross detection circuit, controlling means and output control circuit, controlling means respectively with zero cross detection circuit with the output control circuit electricity is connected, zero cross detection circuit includes the isolator, the input and the alternating current power supply electricity of isolator are connected, the output of isolator with the controlling means electricity is connected, the isolator is used for keeping apart interference signal, output control circuit is connected with the electromagnetic pump electricity.
The utility model discloses an electromagnetic pump control system's beneficial effect is: the zero-crossing detection circuit detects a zero-crossing signal in an alternating current signal output by the alternating current power supply and transmits the zero-crossing signal to the control device, the control device outputs a trigger signal to the output control circuit after receiving the zero-crossing signal, and the output control circuit controls the electromagnetic pump to be switched on or switched off. The utility model discloses an adopted the isolator among the zero cross detection circuit, the isolator is arranged in the interference signal who keeps apart the environment, can improve the zero cross signal's of gathering precision, reduces noise signal to improve whole control system's stability and control accuracy.
On the basis of the technical scheme, the utility model discloses can also do as follows the improvement:
further, the isolator includes first opto-coupler, first opto-coupler is transistor output type opto-coupler, including the first opto-coupler diode of input side and the first transistor of output side, zero passage detection circuitry still includes rectifier diode, current-limiting resistor, fuse and pull-down resistance, rectifier diode's positive pole is connected with alternating current power supply's zero line electricity, rectifier diode's negative pole passes through current-limiting resistor with the positive pole electricity of first opto-coupler diode is connected, the negative pole warp of first opto-coupler diode the fuse is connected with alternating current power supply's live wire electricity, the collecting electrode and the direct current power supply electricity of first transistor are connected, the projecting pole of first transistor respectively with controlling means with the one end electricity of pull-down resistance is connected, the other end ground connection of pull-down resistance.
The beneficial effects of the further scheme are as follows: because the rectifier diode has the unidirectional conduction characteristic, the first optical coupler is conducted when the commercial power is in a negative half-wave state, and is cut off when the commercial power is in a positive half-wave state. Two pins of the output side of the first optical coupler are respectively connected with the control device and the direct-current power supply, and when the transistor in the first optical coupler is switched on, the first optical coupler outputs a high level. When the transistor in the first optical coupler is cut off, the first optical coupler outputs low level, and the control device outputs trigger pulse when catching the pulse falling edge output by the first optical coupler. The zero-crossing detection circuit adopts the first optocoupler to isolate high-frequency interference, so that the stability and the control precision of the control system can be improved.
Further, output control circuit is including keeping apart drive circuit and protection circuit, protection circuit includes freewheel diode and RC spike absorption circuit, freewheel diode's negative pole is connected with alternating current power supply's live wire electricity, freewheel diode's positive pole passes through keep apart drive circuit with the controlling means electricity is connected, freewheel diode's positive pole still passes through RC spike absorption circuit is connected with alternating current power supply's zero line electricity, RC spike absorption circuit includes first electric capacity and the first resistance of establishing ties, freewheel diode's positive pole still is connected with electromagnetic pump's negative pole electricity, freewheel diode's negative pole and electromagnetic pump's anodal electricity are connected.
The beneficial effects of the further scheme are as follows: the spike pulse absorption circuit can enhance the anti-interference performance of the circuit. The follow current diodes are connected to two ends of the electromagnetic pump and used for providing a follow current loop when the unidirectional silicon controlled rectifier or the optical coupling silicon controlled rectifier is turned off, and the impact of the inductive load of the electromagnetic pump on the circuit is reduced.
Further, the isolation driving circuit includes a first isolation driving circuit.
The first isolation driving circuit comprises a second optical coupler, a first pull-up resistor and a second resistor, wherein the second optical coupler is a one-way silicon controlled rectifier output type optical coupler and comprises a second optical coupler diode at the input side and an optical coupler silicon controlled rectifier at the output side, the anode of the second optical coupler diode is connected to a direct current power supply through the first pull-up resistor, the cathode of the second optical coupler diode is electrically connected with the control device, the anode of the optical coupler silicon controlled rectifier is electrically connected with the cathode of the electromagnetic pump, the cathode of the optical coupler silicon controlled rectifier is electrically connected with the zero line of the alternating current power supply, and the control electrode of the optical coupler silicon controlled rectifier is connected to the zero line of the alternating current power supply through the second resistor.
The beneficial effects of the further scheme are as follows: the second resistor is connected with a zero line and used for setting the conduction angle of the optocoupler silicon controlled rectifier to be 0 degree. The pulse signal that controlling means sent triggers the opto-coupler silicon controlled rectifier of second opto-coupler output side and switches on, and the opto-coupler silicon controlled rectifier is one-way silicon controlled rectifier, because one-way conductivity of one-way silicon controlled rectifier, and first isolation drive circuit only switches on at the positive half-wave of interchange, drives the work of electromagnetic pump.
Further, the isolation driving circuit includes a second isolation driving circuit.
The second isolation driving circuit comprises a third optocoupler, a second pull-up resistor, a third resistor, a fourth resistor and a unidirectional silicon controlled rectifier, wherein the third optical coupler is a transistor output type optical coupler and comprises a third optical coupler diode at the input side and a second transistor at the output side, the anode of the third optical coupling diode is connected to a direct current power supply through the second pull-up resistor, the cathode of the third optical coupling diode is electrically connected with the control device, the anode of the second transistor is electrically connected with a direct current power supply, the third resistor and the fourth resistor are sequentially connected in series between the cathode of the second transistor and the ground, the control electrode of the unidirectional silicon controlled rectifier is connected between the third resistor and the fourth resistor, the cathode of the unidirectional silicon controlled rectifier is electrically connected with the zero line of the alternating current power supply, and the anode of the unidirectional silicon controlled rectifier is electrically connected with the cathode of the electromagnetic pump.
The beneficial effects of the further scheme are as follows: the output control circuit utilizes the isolation characteristic of the optocoupler device, effectively prevents the problem of false triggering when the pin of the control device directly controls the unidirectional silicon controlled rectifier or the optocoupler silicon controlled rectifier, and can also isolate the interference of the on-off moment of the electromagnetic pump and the alternating-current half-wave asymmetric power supply mode on the control system, thereby increasing the stability of the system.
The zero-crossing detection circuit, the control device and the isolation driving circuit are all arranged on the substrate.
The beneficial effects of the further scheme are as follows: the zero-cross detection circuit, the control device and the isolation driving circuit are arranged on the substrate, so that the size of a control system can be reduced, and the wires are convenient to arrange.
The LED driving circuit further comprises a power supply circuit for supplying power, wherein the power supply circuit comprises a fifth resistor, a sixth resistor, a second capacitor, a third capacitor, a polar capacitor, a first diode, a second diode, a voltage stabilizing diode and a light emitting diode.
The fifth resistor is connected with the second capacitor in parallel, one end of the second capacitor is electrically connected with a live wire of an alternating current power supply, and is electrically connected with the zero line of an alternating current power supply through the third capacitor, the other end of the second capacitor is respectively and electrically connected with the anode of the first diode and the cathode of the second diode, the anode of the second diode is electrically connected with a zero line of an alternating current power supply, the cathode of the first diode is electrically connected with the cathode of the voltage stabilizing diode, the anode of the voltage stabilizing diode is electrically connected with a zero line of an alternating current power supply, the anode of the polar capacitor is electrically connected with the cathode of the voltage stabilizing diode and used as the direct current power supply, the cathode of the polar capacitor is grounded, and the anode of the polar capacitor is also electrically connected with the anode of the light-emitting diode, and the cathode of the light-emitting diode is electrically connected with the control device through a sixth resistor.
The beneficial effects of the further scheme are as follows: the alternating current signal output by the alternating current power supply is converted into the direct current signal through the power circuit, and the cost can be reduced without additionally arranging a direct current power supply so as to be applied to small household appliances.
Drawings
Fig. 1 is a schematic structural diagram of an electromagnetic pump control system according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an electromagnetic pump control system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a first isolated driving circuit of an electromagnetic pump control system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a second isolation driving circuit of an electromagnetic pump control system according to an embodiment of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the circuit comprises a control module, 10, a control device, 20, an output control circuit, 30, a zero-crossing detection circuit, 40, a power supply circuit, 201, an isolation driving circuit, 202 and a protection circuit.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides an electromagnetic pump control system, including controlling means 10, output control circuit 20 and zero cross detection circuit 30, controlling means 10 respectively with zero cross detection circuit 30 with output control circuit 20 electricity is connected, zero cross detection circuit 30 includes the isolator, the input and the alternating current power supply electricity of isolator are connected, the output of isolator with controlling means 10 electricity is connected, the isolator is used for keeping apart interference signal, output control circuit 20 is connected with the electromagnetic pump electricity.
In this embodiment, the zero-cross detection circuit 30 detects a zero-cross signal in an ac signal output by the ac power supply, and transmits the zero-cross signal to the control device 10, the control device 10 outputs a trigger signal to the output control circuit 20 after receiving the zero-cross signal, and the output control circuit 20 controls the electromagnetic pump to be turned on or off. The utility model discloses an adopted the isolator among the electromagnetic pump zero passage detection circuit, the isolator is arranged in the interference signal who keeps apart the environment, can improve the precision of the zero passage signal who gathers, reduces noise signal to improve whole control system's stability and control accuracy.
Specifically, the control device 10 may employ a single chip microcomputer or a monostable trigger or a counter, for example, an MCS51 series single chip microcomputer, the monostable trigger has only one steady state and one transient steady state, and the monostable trigger can be turned from the steady state to the transient steady state under the action of the zero-crossing signal, that is, after receiving the zero-crossing signal, the monostable trigger outputs a trigger signal. The counter counts the number of pulses in a digital circuit, can also be used for frequency division, timing, generation of beat pulses, pulse sequences and the like, and consists of a basic counting unit and a plurality of control gates, wherein the counting unit consists of a series of various triggers with information storage functions, and can count zero-crossing signals and output pulse signals. The alternating current power supply is used for supplying power for the whole control circuit and the electromagnetic pump, commercial power can be used as the alternating current power supply, the alternating current power supply which is correspondingly output can be selected according to the actual input of the electromagnetic pump, and the output voltage can be 220V or 380V and the like.
The dc power supply is used for supplying power to components such as the control device 10, for example, outputting 5V dc operating voltage to the control device 10, so as to ensure the normal operation of the control device 10.
It should be noted that the present invention relates only to the improvement of the circuit structure, and does not relate to the improvement of the method itself, wherein the prior art is the output of the trigger signal after the control device receives the zero-crossing signal.
Preferably, the isolator includes a first optical coupler, i.e. U1, the first optical coupler U1 is a transistor output type optical coupler, and includes a first optical coupler diode on the input side and a first transistor on the output side, the zero-crossing detection circuit 30 further includes a rectifier diode, in fig. 2, D1, a current-limiting resistor, i.e., R1, a fuse, i.e., F1, and a pull-down resistor, i.e., R2, a rectifier diode D1 is connected in series with the current-limiting resistor R1, an anode of the rectifier diode D1 is electrically connected to a neutral line N of the utility power, a cathode of the rectifier diode D1 is electrically connected to an anode of the first optocoupler diode through the current-limiting resistor R1, a cathode of the first optocoupler diode is electrically connected to a live line L of the utility power through the fuse F1, a collector of the first transistor is electrically connected to a VCC dc power supply, an emitter of the first transistor is electrically connected to an IO2 pin of the control device 10 and one end of the pull-down resistor R2, and the other.
Specifically, a commercial power zero line N is connected to an anode of a light coupling diode in the first optical coupler U1 through a rectifier diode D1 and a current-limiting resistor R1, a cathode of the light coupling diode is connected to a commercial power live line L through a fuse F1, and the rectifier diode D1 has a unidirectional conduction characteristic, so that the first optical coupler U1 is conducted during a negative half-wave and is cut off during a positive half-wave of the commercial power. Two pins of the output side of the first optical coupler U1 are respectively connected with an IO2 pin and a VCC power supply, and meanwhile, the IO2 pin is also grounded through a pull-down resistor R5. When the transistor in the first optocoupler U1 is turned on, the IO2 pin of the control device 10 gets a high level. When the transistor in the first optocoupler U1 is turned off, the IO2 pin gets low level, and the control device 10 outputs a trigger pulse when capturing a pulse falling edge. The zero-crossing detection circuit 30 adopts the first optocoupler U1 to isolate high-frequency interference, so that the stability and the control precision of the control system can be improved.
When the current limiting resistor R1 is selected, the resistance value of the current limiting resistor R1 can be properly increased, the current can be reduced, the power consumption of the current limiting resistor R1 can be reduced, and the service life of components in a control system can be prolonged.
Preferably, the output control circuit 20 includes an isolation driving circuit 201 and a protection circuit 202, the protection circuit 202 includes a freewheeling diode, D2 in fig. 2, and an RC spike absorption circuit, a cathode of the freewheeling diode D2 is electrically connected to a live line L of the commercial power, an anode of the freewheeling diode D2 is electrically connected to the control device 10 through the isolation driving circuit 201, an anode of the freewheeling diode D2 is also electrically connected to a neutral line N of the commercial power through the RC spike absorption circuit, the RC spike absorption circuit includes a first capacitor, C1, and a first resistor, R3, which are connected in series, an anode of the freewheeling diode D2 is also electrically connected to a cathode P-of the electromagnetic pump, and a cathode of the freewheeling diode D2 is electrically connected to an anode P + of the electromagnetic pump.
Particularly, the C1 and the R3 are connected in series to form a spike pulse absorption circuit, so that the anti-interference performance of the circuit can be enhanced. D2 is a freewheeling diode, connects at electromagnetic pump interface P + and P-both ends, is used for providing the freewheel return circuit when unidirectional silicon controlled rectifier or opto-coupler silicon controlled rectifier turn-off, reduces the impact of the inductive load of electromagnetic pump to the circuit.
Preferably, the isolation driving circuit 201 includes a first isolation driving circuit.
The first isolation driving circuit comprises a second optical coupler, namely U2 in the figure 3, a second optical coupler U2 is a unidirectional silicon controlled rectifier output optical coupler, the unidirectional silicon controlled rectifier output optical coupler comprises an optical coupling diode on the optical coupling input side and an optical coupling silicon controlled rectifier on the optical coupling output side, a second resistor, namely R4, and a first pull-up resistor, namely R5, the anode of the second optical coupling diode is connected to a VCC direct current power supply through a first pull-up resistor R5, the cathode of the second optical coupling diode is electrically connected with an IO2 pin of the control device 10, the anode of the optical coupling silicon controlled rectifier in the second optical coupling U2 is electrically connected with the cathode P-of an electromagnetic pump, the cathode of the optical coupling silicon controlled rectifier of the second optical coupling U2 is electrically connected with a zero line N of a mains supply, and the control electrode of the optical coupling silicon controlled rectifier of the second optical coupling U2 is connected to a zero line of the.
Specifically, a second resistor R4 is connected to the neutral line N for setting the optocoupler silicon controlled rectifier conduction angle to 0 °. The I/O port of the control device 10 is connected to the input end of the second optical coupler U2 after being pulled up, the wide pulse signal sent by the control device 10 triggers the optical coupler silicon controlled rectifier on the output side of the second optical coupler U2 to be conducted, the optical coupler silicon controlled rectifier is a one-way silicon controlled rectifier, and due to the one-way conduction of the one-way silicon controlled rectifier, the first isolation driving circuit 201 is only conducted on the positive half-wave of alternating current to drive the electromagnetic pump to work.
Preferably, the isolation driving circuit 201 includes a second isolation driving circuit.
The second isolation driving circuit comprises a third optical coupler, namely U3 in figure 4, the third optical coupler U3 is a transistor output type optical coupler, the transistor output type optical coupler comprises a third optical coupler diode on the input side of the optical coupler and a second transistor on the output side of the optical coupler, and further comprises a second pull-up resistor, namely R8, a third resistor, namely R9, a fourth resistor, namely R10, and a unidirectional silicon controlled rectifier D8, the anode of the third optical coupler diode is connected to a VCC direct current power supply through a second pull-up resistor R8, the cathode of the third optical coupler diode is electrically connected with an IO3 pin of the control device 10, the collector of the second transistor is electrically connected with a VCC power supply, a third resistor R9 and a fourth resistor R10 are sequentially connected in series between the emitter of the second transistor and the ground, the control electrode of the unidirectional silicon controlled rectifier D8 is connected between the third resistor R9 and the fourth resistor R10, the cathode of the unidirectional silicon controlled rectifier D8 is electrically connected with a zero line N of a, the anode of the one-way thyristor D8 is electrically connected with the cathode P-of the electromagnetic pump.
Specifically, an I/O port of the control device 10 is connected to an input end of a third optocoupler U3 after being pulled up, an anode of an optocoupler diode at an input side of the third optocoupler U3 is connected to a VCC power supply through a pull-up resistor R8, and a cathode of the optocoupler diode is connected to an IO3 pin. The anode of a second transistor at the output side of the third optocoupler U3 is connected with a VCC direct current power supply through a pull-up resistor R8, and the cathode of the second transistor is grounded through two voltage division resistors R9 and R10. The unidirectional silicon controlled rectifier D8 is connected with the electromagnetic pump in series to play the roles of rectifying and controlling the on-off of the electromagnetic pump. The control electrode of the one-way thyristor D8 is connected between the two voltage dividing resistors R9 and R10, so as to obtain a trigger signal which is output by the control device 10 and controls the on/off of the one-way thyristor D8. When the control device 10 sends a trigger pulse, the optocoupler transistor of the third optocoupler U3 is switched on, the one-way thyristor D8 is switched on after a period of time, and the electromagnetic pump obtains a positive half-wave driving signal. The cathode of the one-way thyristor D8 is connected with a commercial power zero line N, the anode is connected with an electromagnetic pump P-interface, the electromagnetic pump P + interface is connected with a commercial power live line L through a protection circuit, and the loop is an electromagnetic pump driving loop.
In the preferred embodiment, the output control circuit 20 utilizes the isolation characteristic of the optocoupler device, so as to effectively prevent the problem of false triggering when the pin of the control device 10 directly controls the unidirectional silicon controlled rectifier or the optocoupler silicon controlled rectifier, and meanwhile, the interference of the on-off time of the electromagnetic pump and the alternating-current half-wave asymmetric power supply mode on the control system can be isolated, so that the stability of the system is improved.
Preferably, the zero-crossing detection circuit 30, the control device 10 and the isolation driving circuit 201 are all arranged on a substrate, and all circuits on the substrate are packaged into a thick film circuit.
Specifically, each part in the control system can be processed in a modular form, the zero-cross detection circuit 30, the control device 10 and the drive isolation control circuit are combined into the control module 1 and integrated on a substrate, the substrate can be a glass substrate, a ceramic substrate and the like, and the circuit on the control module 1 is packaged into a thick film circuit, wherein the thick film circuit is an integrated circuit formed by manufacturing a passive network on the same substrate by adopting an array film process (screen printing, sintering, electroplating and the like) and assembling discrete semiconductor devices, single-chip integrated circuits or micro elements. Meanwhile, other circuits are integrated on the bottom plate, and the control module 1 is connected with the bottom plate to form a control system.
In the preferred embodiment, the circuit in the control module 1 is packaged into a thick film circuit, so that the circuit can be waterproof and dustproof, and the service life of the circuit can be prolonged.
Preferably, a power supply circuit 40 for supplying power is further included, the power supply circuit 40 includes a fifth resistor, i.e., R6 in fig. 2, a sixth resistor, i.e., R7, a second capacitor, i.e., C3, a third capacitor, i.e., C5, a polar capacitor, i.e., C4, a first diode, i.e., D3, a second diode, i.e., D4, a zener diode, i.e., D5, and a light emitting diode, i.e., D6.
A fifth resistor R6 is connected in parallel with a second capacitor C3, one end of the second capacitor C3 is electrically connected with a live wire L of the commercial power and is also electrically connected with a zero line N of the commercial power through a third capacitor C5, the other end of the second capacitor C3 is respectively electrically connected with the anode of a first diode D3 and the cathode of a second diode D4, the anode of the second diode D4 is electrically connected with the commercial power zero line N, the cathode of the first diode D3 is electrically connected with the cathode of a voltage stabilizing diode D5, the anode of the voltage stabilizing diode D5 is electrically connected with the commercial power zero line N, the anode of a polar capacitor C4 is electrically connected with the cathode of the voltage stabilizing diode D5 and is used as the DC power supply, namely, the VCC power supply, the negative electrode of the polar capacitor C4 is grounded and electrically connected to the positive electrode of the zener diode D5, the positive electrode of the polar capacitor C4 is also electrically connected to the positive electrode of the light emitting diode D6, and the negative electrode of the light emitting diode D6 is electrically connected to the IO1 pin of the control device 10 through the sixth resistor R7.
Specifically, a voltage reduction circuit formed by connecting a fifth resistor R6 and a second capacitor C3 in parallel is used for obtaining electricity from the mains supply AC220V, and then the electricity is rectified and filtered by a first diode D3 and a polar capacitor C4, and then a VCC direct current power supply required by a control system is obtained by a voltage stabilizing diode D5. The second diode D4 is a freewheeling diode for forming a circuit with the first diode D3 and the zener diode D5 to discharge the excess current of the constant current source VCC power supply when the load fluctuates. However, if the current is too large and exceeds the maximum stable current of the zener diode D5, the zener diode D5 may be permanently damaged, and the power circuit may malfunction, so that the following constant current compensation circuit is designed in this application to reduce the impact of the load fluctuation on the VCC dc power supply, wherein the output terminal of the power circuit 40, i.e., the VCC power supply in the figure, is connected to the IO1 pin of the control device 10 through the light emitting diode D6 and the resistor R7 to form the constant current compensation circuit. The on-off state of the constant current compensation circuit is controlled by the control device 10, so that the on-off state of the constant current compensation circuit is complementary with the working state of an optical coupler diode at the input side of a second optical coupler U2 or a third optical coupler U3 in the output control circuit 20. And the current when the compensation circuit is conducted is adjusted by using the sixth resistor R7, so that the current is consistent with the input current when the optocoupler diode at the input side of the second optocoupler U2 or the third optocoupler U3 is conducted, and the influence of load fluctuation on the VCC power supply is weakened as much as possible.
In the description of the present invention, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (7)
1. The electromagnetic pump control system is characterized by comprising a zero-crossing detection circuit, a control device and an output control circuit, wherein the control device is respectively and electrically connected with the zero-crossing detection circuit and the output control circuit, the zero-crossing detection circuit comprises an isolator, the input end of the isolator is electrically connected with an alternating current power supply, the output end of the isolator is electrically connected with the control device, the isolator is used for isolating interference signals, and the output control circuit is electrically connected with an electromagnetic pump.
2. The electromagnetic pump control system of claim 1, wherein the isolator includes a first optocoupler, the first optical coupler is a transistor output type optical coupler and comprises a first optical coupler diode at the input side and a first transistor at the output side, the zero-crossing detection circuit also comprises a rectifier diode, a current-limiting resistor, a fuse and a pull-down resistor, the anode of the rectifier diode is electrically connected with a zero line of an alternating current power supply, the cathode of the rectifier diode is electrically connected with the anode of the first optocoupler diode through the current-limiting resistor, the negative electrode of the first optocoupler diode is electrically connected with a live wire of an alternating current power supply through the fuse, the collector electrode of the first transistor is electrically connected with a direct current power supply, and the emitter of the first transistor is electrically connected with the control device and one end of the pull-down resistor respectively, and the other end of the pull-down resistor is grounded.
3. The electromagnetic pump control system according to claim 1, wherein the output control circuit comprises an isolation drive circuit and a protection circuit, the protection circuit comprises a freewheeling diode and an RC spike absorption circuit, a cathode of the freewheeling diode is electrically connected with a live wire of an alternating current power supply, an anode of the freewheeling diode is electrically connected with the control device through the isolation drive circuit, an anode of the freewheeling diode is electrically connected with a zero wire of the alternating current power supply through the RC spike absorption circuit, the RC spike absorption circuit comprises a first capacitor and a first resistor connected in series, an anode of the freewheeling diode is electrically connected with a cathode of the electromagnetic pump, and a cathode of the freewheeling diode is electrically connected with an anode of the electromagnetic pump.
4. The electromagnetic pump control system of claim 3, wherein the isolated drive circuit comprises a first isolated drive circuit;
the first isolation driving circuit comprises a second optical coupler, a first pull-up resistor and a second resistor, wherein the second optical coupler is a one-way silicon controlled rectifier output type optical coupler and comprises a second optical coupler diode at the input side and an optical coupler silicon controlled rectifier at the output side, the anode of the second optical coupler diode is connected to a direct current power supply through the first pull-up resistor, the cathode of the second optical coupler diode is electrically connected with the control device, the anode of the optical coupler silicon controlled rectifier is electrically connected with the cathode of the electromagnetic pump, the cathode of the optical coupler silicon controlled rectifier is electrically connected with the zero line of the alternating current power supply, and the control electrode of the optical coupler silicon controlled rectifier is connected to the zero line of the alternating current power supply through the second resistor.
5. The electromagnetic pump control system of claim 3, wherein the isolated drive circuit comprises a second isolated drive circuit;
the second isolation driving circuit comprises a third optocoupler, a second pull-up resistor, a third resistor, a fourth resistor and a unidirectional silicon controlled rectifier, wherein the third optical coupler is a transistor output type optical coupler and comprises a third optical coupler diode at the input side and a second transistor at the output side, the anode of the third optical coupling diode is connected to a direct current power supply through the second pull-up resistor, the cathode of the third optical coupling diode is electrically connected with the control device, the anode of the second transistor is electrically connected with a direct current power supply, the third resistor and the fourth resistor are sequentially connected in series between the cathode of the second transistor and the ground, the control electrode of the unidirectional silicon controlled rectifier is connected between the third resistor and the fourth resistor, the cathode of the unidirectional silicon controlled rectifier is electrically connected with the zero line of the alternating current power supply, and the anode of the unidirectional silicon controlled rectifier is electrically connected with the cathode of the electromagnetic pump.
6. The electromagnetic pump control system according to any of claims 3 to 5, further comprising a substrate, the zero-crossing detection circuit, the control device and the isolated drive circuit all being disposed on the substrate.
7. An electromagnetic pump control system according to any one of claims 1 to 5, further comprising a power supply circuit for supplying power, the power supply circuit comprising a fifth resistor, a sixth resistor, a second capacitor, a third capacitor, a polarity capacitor, a first diode, a second diode, a zener diode and a light emitting diode;
the fifth resistor is connected with the second capacitor in parallel, one end of the second capacitor is electrically connected with a live wire of an alternating current power supply, and is electrically connected with the zero line of an alternating current power supply through the third capacitor, the other end of the second capacitor is respectively and electrically connected with the anode of the first diode and the cathode of the second diode, the anode of the second diode is electrically connected with a zero line of an alternating current power supply, the cathode of the first diode is electrically connected with the cathode of the voltage stabilizing diode, the anode of the voltage stabilizing diode is electrically connected with a zero line of an alternating current power supply, the anode of the polar capacitor is electrically connected with the cathode of the voltage stabilizing diode and used as a direct current power supply, the cathode of the polar capacitor is grounded, and the anode of the polar capacitor is also electrically connected with the anode of the light-emitting diode, and the cathode of the light-emitting diode is electrically connected with the control device through a sixth resistor.
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| CN201920885390.3U CN210599360U (en) | 2019-06-12 | 2019-06-12 | Electromagnetic pump control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114509669A (en) * | 2022-04-18 | 2022-05-17 | 华邦创科(惠州市)智能科技有限公司 | IGBT switch damage detection device and detection method of single-phase intelligent power utilization protector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114509669A (en) * | 2022-04-18 | 2022-05-17 | 华邦创科(惠州市)智能科技有限公司 | IGBT switch damage detection device and detection method of single-phase intelligent power utilization protector |
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