CN-121689990-B - Submersible pump variable frequency driving circuit, driving method and submersible pump system

CN121689990BCN 121689990 BCN121689990 BCN 121689990BCN-121689990-B

Abstract

The application relates to the technical field of submersible pumps, and provides a submersible pump variable-frequency driving circuit, a driving method and a submersible pump system, wherein the submersible pump driving method comprises the steps of responding to a first current event and a second current event of a power loop of a motor driving circuit, and acquiring a first trigger time and a second trigger time through a sampling circuit; the method comprises the steps of determining a submersible pump driving mode based on a first trigger time and a second trigger time, wherein the first current event is that current reaches a preset first threshold value, the second current event is that current reaches a preset second threshold value, the first trigger time is that the first current event is that the second current event is that the first current event is that the second current event is, and the second trigger time is that the second current event is that the first current event is that the current reaches a preset second threshold value. The driving method of the oil-submerged pump can solve the problem that the scene suitability is insufficient possibly caused by driving the oil-submerged pump by adopting a single fixed operation mode in the related technology.

Inventors

HAO XINGLIANG
GUO JUNJIE
YU WENRU
LI QILI
NIE DONG
DU YANPING
ZHU JIANGUANG
Feng Qianfeng
LIU LIANGYONG
JIANG HAO

Assignees

浙江嘉松科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260205

Claims (9)

1. The submersible pump driving method is characterized by being applied to a submersible pump variable frequency driving circuit, wherein the submersible pump variable frequency driving circuit is applied to a submersible pump system and comprises a motor driving circuit and a control circuit, the motor driving circuit is connected with the control circuit, and the submersible pump variable frequency driving circuit further comprises: The isolation operational amplifier module U1; the sampling circuit is respectively connected with the power loop of the motor driving circuit and the input end of the isolation operational amplifier module U1, and is used for collecting the current of the power loop of the motor driving circuit, converting the current of the power loop into a differential voltage signal in direct proportion to the current and then outputting the differential voltage signal to the input end of the isolation operational amplifier module U1; The power supply filter circuit is respectively connected with the isolation operational amplifier module U1 and the 5V power supply and used for absorbing the static pulse on the power side power line and stabilizing the power side power voltage, and the other power supply filter circuit is respectively connected with the isolation operational amplifier module U1 and the 3V3 power supply and used for absorbing the static pulse on the control side power line and stabilizing the control side power voltage; a differential to single-ended circuit connected with the output end of the isolation operational amplifier module U1 for converting the differential signal output by the isolation operational amplifier module U1 into a single-ended signal, and The filter protection circuit is respectively connected with the input ends of the differential-to-single-ended circuit and the control circuit, and is used for receiving the single-ended signal output by the differential-to-single-ended circuit, filtering high-frequency noise of the single-ended signal, absorbing electrostatic pulses and outputting the high-frequency noise to an ADC interface of the control circuit; the method comprises the following steps: The method comprises the steps of responding to a first current event and a second current event of a power loop of a motor driving circuit, and acquiring a first trigger time and a second trigger time through a sampling circuit, wherein the first current event is that current reaches a preset first threshold value, the second current event is that current reaches a preset second threshold value, the first trigger time is the trigger time of the first current event, and the second trigger time is the trigger time of the second current event; And determining a submersible pump driving mode based on the first trigger time and the second trigger time, wherein the submersible pump driving mode is used for controlling the submersible pump.
2. The method of driving an oil-submerged pump of claim 1, wherein the 4-pin of the isolation op-amp module U1 is grounded, the 5-pin of the isolation op-amp module U1 is grounded, the sampling circuit comprises a resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2 and a capacitor C3, wherein: The resistor R1 is connected in series in a power loop of the motor driving circuit, one end of the resistor R1 is connected with the power loop of the motor driving circuit, the other end of the resistor R1 is connected with power ground, and the resistor R1 is used for generating a voltage difference proportional to current when the current flows; One end of the resistor R2 is connected with a common node of the resistor R1 and a power loop of the motor driving circuit, and the other end of the resistor R2 is connected with a pin 2 of the isolation operational amplifier module U1; one end of the resistor R3 is connected with a common node of the resistor R1 and power ground, and the other end of the resistor R3 is connected with the 3 pin of the isolation operational amplifier module U1; One end of the capacitor C1 is connected with a common node of the resistor R2 and the isolation operational amplifier module U1, and the other end of the capacitor C is connected with a common node of the resistor R3 and the isolation operational amplifier module U1; One end of the capacitor C2 is connected with a common node of the resistor R3 and the isolation operational amplifier module U1, and the other end of the capacitor C is connected with a common node of the isolation operational amplifier module U1 and power ground; one end of the capacitor C3 is connected with a common node of the resistor R2 and the isolation operational amplifier module U1, and the other end of the capacitor C is connected with a common node of the isolation operational amplifier module U1 and power ground; The two ends of the capacitor C1 are respectively connected with the 2 pins and the 3 pins of the isolation operational amplifier module U1, the capacitor C2 and the capacitor C3 are connected with power ground, and the resistor R1, the resistor R2, the resistor R3, the capacitor C1, the capacitor C2 and the capacitor C3 form a differential filter network for filtering high-frequency noise in a sampling signal and simultaneously matching the input impedance of the isolation operational amplifier module U1 so as to avoid signal reflection.
3. The method of driving a submersible pump according to claim 1, wherein the 1 pin of the isolation operational amplifier module U1 is connected with a 5V power supply, the 8 pin of the isolation operational amplifier module U1 is connected with a 3V3 power supply, and the power supply filter circuit comprises a power supply decoupling capacitor and an ESD protection diode, wherein: One end of the ESD protection diode is connected with a 5V power supply or a 3V3 power supply, and the other end of the ESD protection diode is connected with power ground or control ground and is used for absorbing electrostatic pulses on a power line of a power side or a control side so as to prevent static electricity from damaging a circuit of the power side or the control side; one end of the power decoupling capacitor is connected with a 5V power supply or a 3V3 power supply, and the other end of the power decoupling capacitor is connected with power ground or control ground and is used for filtering high-frequency noise of the 5V power supply or the 3V3 power supply, stabilizing power-side or control-side power supply voltage and guaranteeing purity of an isolated operational amplifier input power supply.
4. The method of driving a submersible pump according to claim 1, wherein the differential-to-single-ended circuit comprises a resistor R4, a resistor R5, a resistor R6, a resistor R7 and an operational amplifier module U2, wherein: The 3 pins of the operational amplifier module U2 are connected with the 7 pins of the isolation operational amplifier module U1, the resistor R6 is connected in series between the 3 pins of the operational amplifier module U2 and the 7 pins of the isolation operational amplifier module U1, the 2 pins of the operational amplifier module U2 are connected with the 6 pins of the isolation operational amplifier module U1, the resistor R4 is connected in series between the 2 pins of the operational amplifier module U2 and the 6 pins of the isolation operational amplifier module U1, and the resistor R4 and the resistor R6 are used for providing symmetrical input impedance to ensure balanced transmission of differential signals; One end of the resistor R5 is connected with the 1 pin of the operational amplifier module U2, the other end of the resistor R5 is connected with the 2 pin of the operational amplifier module U2, and the resistor R5 is used for being matched with the resistor R4 and the resistor R6 so as to set the gain of the operational amplifier module U2; one end of the resistor R7 is connected with the 3 pin of the operational amplifier module U2, the other end of the resistor R7 is connected with 1V24 reference voltage, and the resistor R7 is used for providing common mode voltage reference for the operation of the operational amplifier module U2, so that the operational amplifier module U2 is ensured to operate in a proper linear range; the 1 foot of the operational amplifier module U2 is connected with the filtering protection circuit, the 8 foot of the operational amplifier module U2 is connected with a 3V3 power supply, the 4 foot of the operational amplifier module U2 is connected with the control ground, and the operational amplifier module U2 is used for converting the differential signal output by the isolation operational amplifier module U1 into a single-ended signal and outputting the single-ended signal to the filtering protection circuit through the 1 foot.
5. The method for driving a submersible pump according to claim 1, wherein the filter protection circuit comprises a resistor R8, a capacitor C5, a capacitor C6 and a diode D3, wherein: One end of the resistor R8 is connected with the output end of the differential-to-single-ended circuit, the other end of the resistor R8 is connected with the ADC input end of the control circuit, and the resistor R8 is used for limiting the input current of an ADC interface of the control circuit; one end of the capacitor C5 is connected with a 3V3 power supply, the other end of the capacitor C5 is connected with the control ground, and the capacitor C5 is used for filtering high-frequency noise of the 3V3 power supply and stabilizing the power supply voltage at the control side; One end of the capacitor C6 is connected with a common node of the resistor R8 and the ADC interface of the control circuit, the other end of the capacitor C6 is connected with control ground, and the capacitor C6 is used for filtering high-frequency noise in a single-ended signal output by the differential-to-single-ended circuit; One end of the diode D3 is connected with the ADC input end of the control circuit, the other end of the diode D3 is connected with the control ground, and the diode D3 is used for absorbing electrostatic pulses of the ADC input end of the control circuit.
6. The submersible pump driving method according to claim 1, wherein the acquiring, by the sampling circuit, the first trigger time and the second trigger time in response to the first current event and the second current event of the power circuit of the motor driving circuit, includes: responding to the current of a power loop of a motor driving circuit to rise to the preset first threshold value from being lower than the preset first threshold value, and acquiring the moment as the first trigger time through a sampling circuit; and responding to the current of the power loop of the motor driving circuit rising from being lower than the preset second threshold value to the preset second threshold value, and acquiring the moment as the second trigger time through the sampling circuit.
7. The submersible pump driving method according to claim 6, wherein the determining a submersible pump driving mode based on the first trigger time and the second trigger time includes: if the time interval between the first triggering time and the second triggering time is smaller than a preset time interval, the driving mode of the oil-submerged pump is confirmed to be a first driving mode, wherein the first driving mode is a rapid oil pumping mode and is suitable for rapid transfer of a large-volume oil tank; if the time interval between the first trigger time and the second trigger time is larger than the preset time interval and the first trigger time is earlier than the second trigger time, confirming the driving mode of the oil-submerged pump as a second driving mode, wherein the second driving mode is an accurate control mode and is suitable for quantitatively transferring the small-volume oil tank; if the time interval between the first trigger time and the second trigger time is larger than the preset time interval and the first trigger time is later than the second trigger time, the driving mode of the oil-submerged pump is confirmed to be a third driving mode, wherein the third driving mode is a low-power consumption protection mode and is suitable for energy-saving operation when the battery power is insufficient.
8. The submersible pump driving method according to claim 1, wherein the acquiring, by the sampling circuit, the first trigger time and the second trigger time in response to the first current event and the second current event of the power circuit of the motor driving circuit, includes: Responding to the fact that the current of a power loop of a motor driving circuit is reduced to the preset first threshold value from the value higher than the preset first threshold value, and acquiring the moment as the first trigger time through a sampling circuit; and responding to the fact that the current of the power loop of the motor driving circuit is reduced to the preset second threshold value from the value higher than the preset second threshold value, and acquiring the moment as the second trigger time through the sampling circuit.
9. A submersible pump system, the submersible pump system comprising: submersible pump, and Variable frequency drive circuit for a submersible pump for implementing the submersible pump driving method according to any one of claims 1 to 8.

Description

Submersible pump variable frequency driving circuit, driving method and submersible pump system Technical Field The application relates to the technical field of oil submerged pumps, in particular to a frequency conversion driving circuit and a driving method of an oil submerged pump and an oil submerged pump system. Background The oil-submerged pump is a portable power equipment specially used for pumping and conveying oil liquid, and is characterized by that it utilizes built-in electric drive (usually adopts D.C. motor) to drive impeller to make it rotate, and can produce negative pressure at the inlet of pump cavity, and can suck the oil liquid, and can discharge the oil liquid through output hose after the oil liquid is pressurized. The oil-submerged pump is widely applied to the scenes such as the fuel oil transfer between outdoor oil tanks, the self-oiling of vehicles, the emergency oil pumping, the management of small oil reservoirs, the oil supply of mechanical equipment and the like, is especially suitable for the mobile working condition of the power supply of a vehicle-mounted battery, and is a key tool in the field of modern miniaturized and portable oil treatment. However, the traditional oil-submerged pump driving method mostly adopts a single fixed operation mode, cannot be dynamically adjusted according to working conditions, and even if a part of equipment is provided with a basic current protection function, the simple overcurrent shutdown operation can be realized only, and the time characteristic of current change is not fully utilized for intelligent regulation and control, so that the problem of insufficient scene suitability is caused. Disclosure of Invention The embodiment of the application provides a variable frequency driving circuit and a driving method of an oil-submerged pump and an oil-submerged pump system, which can solve the technical problem that the driving of the oil-submerged pump by adopting a single fixed operation mode may cause insufficient scene suitability in the related technology. In a first aspect, an embodiment of the present application provides a submersible pump variable frequency driving circuit, which is applied to a submersible pump system, where the submersible pump variable frequency driving circuit includes a motor driving circuit and a control circuit, the motor driving circuit is connected with the control circuit, and the submersible pump variable frequency driving circuit further includes: The isolation operational amplifier module U1; the sampling circuit is respectively connected with the power loop of the motor driving circuit and the input end of the isolation operational amplifier module U1, and is used for collecting the current of the power loop of the motor driving circuit, converting the current of the power loop into a differential voltage signal in direct proportion to the current and then outputting the differential voltage signal to the input end of the isolation operational amplifier module U1; The power supply filter circuit is respectively connected with the isolation operational amplifier module U1 and the 5V power supply and used for absorbing the static pulse on the power side power line and stabilizing the power side power voltage, and the other power supply filter circuit is respectively connected with the isolation operational amplifier module U1 and the 3V3 power supply and used for absorbing the static pulse on the control side power line and stabilizing the control side power voltage; a differential to single-ended circuit connected with the output end of the isolation operational amplifier module U1 for converting the differential signal output by the isolation operational amplifier module U1 into a single-ended signal, and The filtering protection circuit is respectively connected with the input ends of the differential-to-single-ended circuit and the control circuit, and is used for receiving the single-ended signal output by the differential-to-single-ended circuit, filtering high-frequency noise of the single-ended signal, absorbing electrostatic pulse and outputting the high-frequency noise to an ADC interface of the control circuit. The technical scheme provided by the embodiment of the application at least has the following technical effects: The variable-frequency driving circuit of the submersible pump provided by the embodiment of the application collects working current of a power loop of a motor driving circuit through a sampling circuit and converts the working current into differential voltage signals in direct proportion to the current, the differential voltage signals are output to an input end of an isolation operational amplifier module U1, the isolation operational amplifier module U1 bears an electric isolation function of a power side and a control side and stably transmits the input differential voltage signals to an output end, two power supply filter circuits are respectively used for supplying po