CN111463750A - Water pump motor detection circuitry that leaks - Google Patents
Water pump motor detection circuitry that leaks Download PDFInfo
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- CN111463750A CN111463750A CN201910952948.XA CN201910952948A CN111463750A CN 111463750 A CN111463750 A CN 111463750A CN 201910952948 A CN201910952948 A CN 201910952948A CN 111463750 A CN111463750 A CN 111463750A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal fluid pressure, liquid level or liquid displacement, e.g. Buchholz relays
- H02H5/083—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal fluid pressure, liquid level or liquid displacement, e.g. Buchholz relays responsive to the entry or leakage of a liquid into an electrical appliance
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/06—Arrangements for supplying operative power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
- H02H7/0844—Fail safe control, e.g. by comparing control signal and controlled current, isolating motor on commutation error
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Abstract
The invention discloses a water pump motor water leakage detection circuit which comprises a rectification module, a first filtering module, an inversion module, an MCU (microprogrammed control unit) control module, a sensor detection module and an auxiliary power supply module which are connected with each other; the sensor control module receives the output of the rectifying module and provides power for the sensor detection module and the auxiliary power supply module; the sensor detection module is used for detecting the humidity inside the motor and sending a detection result to the sensor control module and the MCU control module, the MCU control module controls the starting or the turning-off of the inversion module according to the detection result, and the sensor control module controls whether to provide power for the MCU control module through the auxiliary power supply module or not according to the detection result, so that the sensor control module can turn off the MCU control module after the MCU control module turns off the main circuit. The invention can detect whether the motor leaks water in real time, and can delay power off after detecting the water leakage, thereby realizing the protection of the MCU control module and the motor.
Description
Technical Field
The invention relates to the technical field of frequency converters, in particular to a water pump motor water leakage detection circuit.
Background
At present, most of seals of a water pump are mechanical seals or O-shaped seals, a water pump motor usually works in an environment with high temperature and humidity, water leakage of the motor can occur along with aging of a sealing ring, and the motor can be burnt down in severe cases.
For the problems, in the prior art, a method mainly based on manual regular inspection is mostly adopted to determine whether the motor has a risk of water leakage, for example, whether a sealing layer of the water sealing pump motor is intact or insulation resistance of the motor is detected, and the detection method is labor-consuming, and power is needed to be cut off in terminal production during maintenance, so that normal production is affected by frequent maintenance. In the prior art, a method of directly adding a fuse at an input end is adopted, when the supply current is too large due to water leakage, a circuit is directly disconnected, and the instant disconnection mode of the protection mode easily damages a control chip (MCU control module) of a control circuit and influences the service life of a motor controller.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a water pump motor water leakage detection circuit which can detect whether a motor leaks water or not in real time, and can delay power off after water leakage is detected, so that the MCU control module and the motor are protected.
The invention adopts the following technical scheme:
a water pump motor water leakage detection circuit comprises a rectification module, a first filtering module, an inversion module, an MCU control module, a sensor detection module and an auxiliary power supply module;
the input end of the first filtering module is connected with the output end of the rectifying module, the input end of the inverting module is connected with the output end of the first filtering module, and the MCU control module controls the inverting module through PWM;
the sensor control module is respectively connected with the rectification module, the sensor detection module and the auxiliary power supply module, receives the output of the rectification module and provides power for the sensor detection module and the auxiliary power supply module;
the sensor detection module is used for detecting the humidity inside the motor and sending a detection result to the sensor control module and the MCU control module, the MCU control module controls the inversion module to be started or shut down according to the detection result, and the sensor control module controls whether to provide power for the MCU control module through the auxiliary power supply module according to the detection result, so that the sensor control module can shut down the MCU control module after the MCU control module shuts down a main circuit. (ii) a
Preferably, the sensor control module comprises a dual contact relay; the output of the rectification module is connected to the input of the auxiliary power supply module through two contacts of the double-contact relay; and the control end of the double-contact relay is connected with the sensor detection module to receive the detection result.
Preferably, the sensor control module comprises a voltage stabilizing unit; the voltage stabilizing unit is arranged between two wires at the output end of the rectifying module; the voltage stabilization unit includes a first voltage stabilization diode.
Preferably, the sensor detection module detects the humidity inside the motor through a humidity sensitive resistor, and the humidity sensitive resistor is installed at the joint inside the sealing layer of the motor.
Preferably, the sensor detection module further comprises an ADC chip, an operational amplifier and three resistors; the humidity sensitive resistor and the three resistors form a bridge circuit; two opposite joints of the bridge circuit are connected with the power supply output of the sensor control module, and the other two opposite joints of the bridge circuit are connected with two input ends of the operational amplifier; and the output end of the operational amplifier is connected with the ADC chip.
Preferably, the auxiliary power supply module comprises a direct current chopping unit, an MOS switch tube, a flyback transformer and an MOS switch voltage stabilizer; the input end of the direct current chopping unit is connected with an output power supply of the sensor control module; the first output end of the direct current chopping unit is connected with the source electrode of the MOS switching tube; the second output end of the direct current chopping unit is connected with one end of the primary side of the flyback transformer; the drain electrode of the MOS switching tube is connected with the other end of the primary side; the grid electrode of the MOS switching tube is connected with the driving end of the MOS switching voltage stabilizer; the power supply input end of the MOS switching regulator is connected with one end of the secondary side of the flyback transformer; and the secondary side of the flyback transformer is connected with the power input end of the MCU control module.
Preferably, a second diode and a third voltage stabilizing diode which are connected in series are further arranged between the second output end of the direct current chopping unit and one end of the primary side of the flyback transformer; and the anode of the second diode is connected with the anode of the third voltage stabilizing diode.
Preferably, a backflow prevention unit is further disposed between the power input end of the MOS switching regulator and the secondary side of the flyback transformer to prevent current backflow of the source.
Preferably, a second filtering module is further disposed between the first output end of the dc chopper unit and the source of the MOS switch tube.
Preferably, the MCU control module comprises an MCU unit and a PWM controller which are connected; the MCU is respectively connected with the auxiliary power supply module and the sensor detection module; the PWM controller is connected with the inversion module and sends or stops sending PWM control signals to the inversion module to control the inversion module to be started or shut down.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention relates to a water leakage detection circuit of a water pump motor, which is provided with a sensor detection module, a sensor control module and an auxiliary power supply module; the humidity inside the motor is detected in real time through the sensor detection module, the detection result is sent to the sensor control module and the MCU control module, the MCU control module controls the working state of the inverter module according to the detection result, and the sensor control module controls whether the auxiliary power supply module provides power for the MCU control module according to the detection result, so that the sensor control module can turn off the MCU control module after the MCU control module turns off the main circuit. The method specifically comprises the following steps: when the sensor detection module detects that water does not leak, the auxiliary power supply module supplies power to the MCU control module, the MCU control module controls the inversion module to start, when water leakage is detected, the MCU control module controls the inversion module to turn off, and the auxiliary power supply module can be powered off in a delayed mode so as to ensure that the MCU control module is powered off after the inversion module is turned off; therefore, the problems of damage to internal components of the inverter module (main circuit) and process locking of the MCU control module caused by sudden power failure are solved, and the MCU control module and the motor are protected;
(2) the sensor detection module comprises a humidity sensitive resistor arranged at the joint inside the sealing layer of the motor, and the humidity inside the motor is detected through the humidity sensitive resistor, so that the detection accuracy is ensured;
(3) the invention adopts the sensor detection module to detect water leakage, and can effectively reduce the manual maintenance cost of the motor.
The above description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the description of the technical means more comprehensible.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a block diagram of a water leakage detection circuit of a water pump motor according to the present invention;
FIG. 2 is a circuit diagram of a sensor control module of the present invention;
FIG. 3 is a circuit diagram of a sensor detection module of the present invention;
FIG. 4 is a circuit diagram of an auxiliary power module according to the present invention;
FIG. 5 is a circuit diagram of the MCU control module of the present invention;
fig. 6 is a circuit diagram of the main circuit (rectifying module, first filtering module, inverting module) of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the water pump motor water leakage detection circuit of the present invention includes a rectification module 101, a first filtering module 102, an inversion module 103, an MCU control module 104, a sensor control module 105, a sensor detection module 106, and an auxiliary power supply module 107.
Specifically, an input end of the first filtering module 102 is connected to an output end of the rectifying module 101, an input end of the inverting module 103 is connected to an output end of the first filtering module 102, and the MCU control module 104 controls the inverting module 103 through PWM;
the sensor control module 105 is connected to the rectifying module 101, the sensor detection module 106 and the auxiliary power supply module 107, receives the output of the rectifying module 101, and provides power to the sensor detection module 106 and the auxiliary power supply module 107;
the sensor detection module 106 is configured to detect humidity inside the motor, and send a detection result to the sensor control module 105 and the MCU control module 104, where the sensor control module 105 controls a working state of the auxiliary power supply module 107 according to the detection result; the MCU control module 104 controls the inversion module 103 to be started or shut down according to the detection result, and the sensor control module 105 controls whether to provide power for the MCU control module 104 according to the detection result;
and the power supply is provided for the MCU control module 104 through the auxiliary power module 107.
The sensor control module is used for switching off the MCU control module after the MCU control module switches off the main circuit, so that the problems of damage to internal components of the inverter module (main circuit) and process locking of the MCU control module caused by sudden power failure can be solved, and the MCU control module and a motor are protected.
Referring to FIG. 2, the sensor control module 105 includes a dual contact relay K1; the output terminals (16, 17) of the rectifier module 101 are connected to the input terminals (14, 15) of the auxiliary power supply module 107 via the two contacts of the double-contact relay; the control terminal (20) of the dual-contact relay K1 is connected to the sensor detection module 106 to receive the detection result.
Further, the sensor control module 105 further includes a voltage stabilization unit; the voltage stabilizing unit is arranged between two conducting wires at output ends (16, 17) of the rectifying module 101, so as to clamp the output of the rectifying module 101 (for example, to 12V) and then output the output to the sensor detecting module 106 through output ends (18, 19). In this embodiment, the voltage stabilization unit includes a first voltage stabilization diode D1.
Referring to fig. 3, the sensor detecting module 106 detects the humidity inside the motor M through a humidity sensitive resistor Se installed at a junction inside a sealing layer of the motor M.
The sensor detection module 106 further includes an ADC chip U2, an operational amplifier U1, and three resistors (R1, R2, and R3); the humidity sensitive resistor Se and the three resistors form a bridge circuit; two opposite joints of the bridge circuit are connected with the power supply output of the sensor control module 105, specifically, a connecting point of the resistor R1 and the humidity sensitive resistor Se is connected with the output end 18; the junction of resistors R2 and R3 is connected to output 19.
The other two opposite joints of the bridge circuit are connected with two input ends of the operational amplifier U1, specifically, the connection point of the resistor R1 and the resistor R2 is connected with the positive input end of the operational amplifier U1 through the adjustable resistor RV and the resistor R5; the junction of the humidity sensitive resistor Se and the resistor R3 is connected with the negative input end of the operational amplifier U2 through a resistor R4.
The output end of the operational amplifier is connected with the ADC chip to output the detection result to the ADC chip U2. The ADC chip U2 sends a detection result to the sensor control module 105 through an output end (20), and the sensor control module 105 controls whether a double-contact relay K1 of the auxiliary power supply module 107 is closed or not according to the detection result. The ADC chip U2 sends the detection result to the MCU control module 104 through the output terminals (10, 11), and the MCU control module 104 controls the inverter module 103 to be turned on or off according to the detection result.
The ADC chip U2 is powered through the outputs (18, 19) of the sensor control module 105.
Referring to fig. 4, the auxiliary power module 107 includes a dc chopper unit (including diodes D5, D6, D7, and D8), a MOS switch Q1, a flyback transformer T, and a MOS switch regulator L M3478, an input end of the dc chopper unit is connected to output power terminals (14, 15) of the sensor control module 105, a first output end of the dc chopper unit is connected to a source S of the MOS switch Q1, a second output end of the dc chopper unit is connected to one end of a primary side of the flyback transformer T, a drain D of the MOS switch Q1 is connected to the other end of the primary side, a gate G of the MOS switch is connected to a driving end of the MOS switch regulator L M3478, a power input end of the MOS switch regulator L M3478 is connected to one end (12) of a secondary side of the flyback transformer, and a secondary side of the transformer T is connected to power input ends (12, 13) of the MCU control module 104.
Specifically, a second diode D2 and a third voltage stabilizing diode D3 which are connected in series are further arranged between the second output end of the direct current chopping unit and the primary end of the flyback transformer T to serve as a protection circuit, so that the MOS switch tube is prevented from being burnt out due to reverse connection of the input ends (14 and 15); the anode of the second diode D2 is connected to the anode of the third zener diode D3.
Specifically, the anti-backflow unit comprises a fourth diode D4, and of course, the anti-backflow unit may further comprise a switch tube or a relay as long as the anti-backflow current can be achieved, and the embodiment of the invention is not particularly limited.
And a second filtering module consisting of inductance capacitors (L1 and C2) is also arranged between the first output end of the direct current chopping unit and the source electrode S of the MOS switching tube Q1.
Referring to fig. 5, the MCU control module 104 includes an MCU unit 1041 and a PWM controller 1042 connected together; the MCU 1041 is respectively connected with the output ends (12, 13) of the auxiliary power supply module 107 and the output ends (10, 11) of the sensor detection module 106; the PWM controller 1042 is connected to the inverter module 103, and sends or stops sending a PWM control signal to the inverter module 103 through an output terminal (7, 8, 9) to control the inverter module 103 to start or stop. In this embodiment, the MCU unit 1041 includes an MCS912 chip; the PWM controller 1042 includes a UCC28950 chip.
Referring to fig. 6, the rectification module 101, the first filtering module 102 and the inversion module 103 form a main circuit of the invention to realize the function of a frequency converter, and specifically, the rectification module 101 includes six diodes (D9-D14), the first filtering module 102 includes resistance capacitors (L3, C4, C5), the inversion module 103 includes six MOS transistors (Q2-Q7), the input end of the rectification module 101 is connected with external three-phase power ports (1, 2, 3), and the output ends (4, 5, 6) of the inversion module 103 are connected with a motor M to provide a frequency-modulated power supply to the motor M.
Specifically, the water pump motor water leakage detection circuit disclosed by the invention has the following working principle:
s101, at the starting stage of electrification, on one hand, the MCU control module 104 is not electrified, the inverter module 103 does not receive the PWM control signal sent by the MCU control module 104, and a corresponding MOS (metal oxide semiconductor) tube is not conducted and is in a closed state, so that a main circuit is not started; on the other hand, the sensor control module 105 directly obtains power from the rectifying module 101 and supplies power to the sensor detection module 106, the sensor detection module 106 detects the humidity inside the motor and sends a humidity detection result (such as a current signal) to the sensor control module 105, and the sensor control module 105 controls the working state of the auxiliary power supply module 107 according to the humidity detection result; if the detection result is normal, turning to S102; otherwise, executing power-off;
s102, the sensor control module 105 sends an auxiliary power working signal to control the auxiliary power module 107 to be powered on, the auxiliary power module 107 supplies power to the MCU control module 104, the MCU control module 104 receives a humidity detection signal sent by the sensor detection module 106, if the humidity detection signal is normal, the MCU control module 104 controls the PWM controller 1042 to send a PWM control signal to the inverter module 103, so that the main circuit is started, the motor is started, and S103 is turned on; otherwise, the MCU control module 104 controls not to send a PWM control signal to the inverter module 103, the main circuit is not started, and the sensor control module 105 receives the humidity detection result and sends an auxiliary power module 107 shutdown signal to control the auxiliary power module 107 to power off;
s103, in the working process of the motor, the MCU control module 104 continuously collects humidity detection signals sent by the sensor detection module 106, and if abnormal detection is detected, the MCU control module 104 stops sending PWM control signals to the inversion module 103 to turn off a main circuit; meanwhile, the sensor control module 105 sends a relay delay turn-off signal to the auxiliary power module 107 according to the received humidity detection result, so that the auxiliary power module 107 is powered off after the MCU control module 104 turns off the main circuit.
Further, the MCU control module 104 may also start an alarm after receiving the humidity detection abnormal signal. Specifically, the alarm can be started through the electric connection alarm, the alarm signal can be sent to a control center or a mobile phone of a maintenance person through the wireless communication module, the water leakage condition of the motor can be known in time, corresponding measures are taken, and the motor is protected.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (10)
1. A water pump motor water leakage detection circuit is characterized by comprising a rectification module, a first filtering module, an inversion module, an MCU control module, a sensor detection module and an auxiliary power supply module;
the input end of the first filtering module is connected with the output end of the rectifying module, the input end of the inverting module is connected with the output end of the first filtering module, and the MCU control module controls the inverting module through PWM;
the sensor control module is respectively connected with the rectification module, the sensor detection module and the auxiliary power supply module, receives the output of the rectification module and provides power for the sensor detection module and the auxiliary power supply module;
the sensor detection module is used for detecting the humidity inside the motor and sending a detection result to the sensor control module and the MCU control module, the MCU control module controls the inversion module to be started or shut down according to the detection result, and the sensor control module controls whether to provide power for the MCU control module through the auxiliary power supply module according to the detection result, so that the sensor control module can shut down the MCU control module after the MCU control module shuts down a main circuit.
2. The water pump motor leakage detection circuit of claim 1, wherein the sensor control module comprises a dual-contact relay; the output of the rectification module is connected to the input of the auxiliary power supply module through two contacts of the double-contact relay; and the control end of the double-contact relay is connected with the sensor detection module to receive the detection result.
3. The water pump motor water leakage detection circuit according to claim 1, wherein the sensor control module includes a voltage regulator unit; the voltage stabilizing unit is arranged between two wires at the output end of the rectifying module; the voltage stabilization unit includes a first voltage stabilization diode.
4. The water pump motor water leakage detection circuit according to claim 1, wherein the sensor detection module detects humidity inside the motor through a humidity sensitive resistor, and the humidity sensitive resistor is installed at a joint inside a sealing layer of the motor.
5. The water pump motor water leakage detection circuit according to claim 4, wherein the sensor detection module further comprises an ADC chip, an operational amplifier and three resistors; the humidity sensitive resistor and the three resistors form a bridge circuit; two opposite joints of the bridge circuit are connected with the power supply output of the sensor control module, and the other two opposite joints of the bridge circuit are connected with two input ends of the operational amplifier; and the output end of the operational amplifier is connected with the ADC chip.
6. The water pump motor water leakage detection circuit according to claim 1, wherein the auxiliary power supply module comprises a direct current chopper unit, an MOS switching tube, a flyback transformer and an MOS switching regulator; the input end of the direct current chopping unit is connected with an output power supply of the sensor control module; the first output end of the direct current chopping unit is connected with the source electrode of the MOS switching tube; the second output end of the direct current chopping unit is connected with one end of the primary side of the flyback transformer; the drain electrode of the MOS switching tube is connected with the other end of the primary side; the grid electrode of the MOS switching tube is connected with the driving end of the MOS switching voltage stabilizer; the power supply input end of the MOS switching regulator is connected with one end of the secondary side of the flyback transformer; and the secondary side of the flyback transformer is connected with the power input end of the MCU control module.
7. The water pump motor water leakage detection circuit according to claim 6, wherein a second diode and a third voltage regulator diode connected in series are further arranged between the second output end of the direct current chopper unit and the primary side end of the flyback transformer; and the anode of the second diode is connected with the anode of the third voltage stabilizing diode.
8. The water pump motor water leakage detection circuit of claim 6, wherein a back-flow prevention unit is further disposed between the power input terminal of the MOS switching regulator and the secondary side of the flyback transformer to prevent current backflow of the source.
9. The water pump motor water leakage detection circuit according to claim 6, wherein a second filtering module is further arranged between the first output end of the direct current chopper unit and the source electrode of the MOS switching tube.
10. The water pump motor water leakage detection circuit according to claim 1, wherein the MCU control module comprises an MCU unit and a PWM controller connected to each other; the MCU is respectively connected with the auxiliary power supply module and the sensor detection module; the PWM controller is connected with the inversion module and sends or stops sending PWM control signals to the inversion module to control the inversion module to be started or shut down.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910952948.XA CN111463750A (en) | 2019-10-09 | 2019-10-09 | Water pump motor detection circuitry that leaks |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910952948.XA CN111463750A (en) | 2019-10-09 | 2019-10-09 | Water pump motor detection circuitry that leaks |
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| CN111463750A true CN111463750A (en) | 2020-07-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112600487A (en) * | 2020-12-07 | 2021-04-02 | 中国科学院长春光学精密机械与物理研究所 | Motor runaway protection system and method |
| CN114609947A (en) * | 2022-03-17 | 2022-06-10 | 佛山市美的清湖净水设备有限公司 | Water leakage protection control system and water purifying device |
-
2019
- 2019-10-09 CN CN201910952948.XA patent/CN111463750A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112600487A (en) * | 2020-12-07 | 2021-04-02 | 中国科学院长春光学精密机械与物理研究所 | Motor runaway protection system and method |
| CN112600487B (en) * | 2020-12-07 | 2022-11-11 | 中国科学院长春光学精密机械与物理研究所 | Motor runaway protection system and method |
| CN114609947A (en) * | 2022-03-17 | 2022-06-10 | 佛山市美的清湖净水设备有限公司 | Water leakage protection control system and water purifying device |
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