Electronic water pump controller circuit

Abstract

The utility model discloses an electronic water pump controller circuit which comprises a B + end and a B-end which are used for supplying power, and two phase driving circuits which are alternately conducted to control rotation of a water pump rotor and a phase commutation circuit which controls the phase driving circuits are connected between the B + end and the B-end. The two phase driving circuits respectively comprise an MOS (Metal Oxide Semiconductor) tube Q3 and an MOS tube Q4; the grid electrode of the MOS transistor Q3 is respectively connected with a resistor R10 and a Zener diode ZD3 and is grounded, the drain electrode of the MOS transistor Q3 is connected with a second stator coil, the other end of the second stator coil is connected to a B + end, all components are adopted, the structure is simple, and the total cost is low. The voltage-withstanding performance is high, the performance is reliable, and the anti-reverse-connection function and the overvoltage protection function are achieved. Only a B + end terminal and a B-end terminal are arranged, other special signal input is not needed, and work can be carried out only by switching on a power supply. The system universality is high, the scheme is suitable for a 12V storage battery system and a 24V storage battery system, and the application vehicle types are wider.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic water pumps, in particular to an electronic water pump controller circuit. Background Art

[0002] The water pump is an important component of the automobile engine cooling system. Its main function is to drive the coolant circulation, absorb the excess heat of the engine and transfer it to the outside air through the heat dissipation device to prevent the engine temperature from being too high.

[0003] The electronic water pump is driven by directly supplying electricity to the electronic water pump, and the energy consumption is relatively low. With the development of technology and the high demand for fuel efficiency, the application of electronic water pumps is increasing. Currently, hybrid and new energy engines on the market are beginning to use electronic water pumps.

[0004] Problems with existing electronic water pumps:

[0005] 1. Existing electronic water pump controllers usually use chips (single-chip microcomputers or dedicated chips) as the main controller. Various protection functions are realized by single-chip microcomputers and matched with peripheral circuits. The overall price is relatively expensive.

[0006] 2. Most existing electronic water pump controllers have PWM input terminals, which require the vehicle ECU to provide a specific signal to input the PWM terminal of the water pump controller to control the speed of the water pump.

[0007] 3. The system is not adaptable. The corresponding components of the 12V system and the 24V system are different, and the microcontroller program also needs to be redesigned.

[0008] To this end, an electronic water pump controller circuit is proposed. Summary of the invention

[0009] The purpose of the utility model is to provide an electronic water pump controller circuit to solve the problems raised in the above background technology.

[0010] To achieve the above object, the utility model provides the following technical solutions: an electronic water pump controller circuit, comprising a B+ terminal and a B- terminal for power supply, wherein two phase drive circuits for alternately conducting and controlling the rotation of the water pump rotor and a phase switching circuit for controlling the phase drive circuit are connected between the B+ terminal and the B- terminal;

[0011] The two phase driving circuits respectively include a MOS transistor Q3 and a MOS transistor Q4;

[0012] The gate of the MOS tube Q3 is respectively connected to a resistor R10 and a Zener diode ZD3 and both are grounded, the drain of the MOS tube Q3 is connected to a second stator coil, the other end of the second stator coil is connected to the B+ terminal, the source of the MOS tube Q3 is grounded, and a resistor R5 is connected between the gate and the drain of the MOS tube Q3;

[0013] The gate of the MOS transistor Q4 is respectively connected to a resistor R11 and a Zener diode ZD2 and grounded, the drain of the MOS transistor Q4 is connected to a first stator coil, the other end of the first stator coil is connected to the B+ terminal, the source of the MOS transistor Q4 is grounded, and a resistor R4 is connected between the gate and drain of the MOS transistor Q3;

[0014] The commutation circuit includes a Hall element H1;

[0015] The V+ end of the Hall element H1 is connected to a resistor R6, the Out end of the Hall element H1 is connected to resistors R7, R12, R15 and R17, the resistor R7 is connected to the B+ end, the resistors R15 and R17 are grounded, the other end of the resistor R12 is connected to the base of the transistor T2, the collector of the transistor T2 is connected to resistors R9, R16 and R18, the resistor R9 ... The base of the transistor T3 is connected between the resistor R16 and the resistor R18, the emitter of the transistor T3 is grounded, the collector of the transistor T3 is connected to the B+ terminal through the resistor R4 and the first stator coil, the base of the transistor T4 is connected between the resistor R15 and the resistor R17, the capacitor C1 and the resistor R2 are connected between the collector of the transistor T4 and the first stator coil, and the capacitor C2 and the resistor R1 are connected between the collector of the transistor T3 and the second stator coil.

[0016] Preferably: a power supply reverse connection protection circuit and an overvoltage protection circuit are also connected between the B+ terminal and the B- terminal.

[0017] Preferably: the power supply reverse connection protection circuit comprises a MOS tube Q1;

[0018] The drain of the MOS transistor Q1 is connected to the B+ terminal, the gate of the MOS transistor Q1 is connected to a resistor R13 and grounded, and a Zener diode ZD1 is connected between the source and the gate of the MOS transistor Q1.

[0019] Preferably: the overvoltage protection circuit comprises a transistor T1;

[0020] A MOS transistor Q2 is connected between the emitter and collector of the transistor T1, a resistor R8, a resistor R3 and a Zener diode ZD4 are connected to the base of the transistor T1, the resistor R3 is connected to the B+ terminal, a resistor R14 is connected to the gate of the MOS transistor Q2 and is grounded, and a drain of the MOS transistor Q2 is connected to the V+ terminal of the Hall element H1 through a resistor R6.

[0021] Preferably, capacitor C3 and capacitor C4 are connected between the B+ terminal and the B- terminal.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] 1. All discrete components are used, with simple structure and low total cost. High voltage resistance, reliable performance, anti-reverse connection function and overvoltage protection function.

[0024] 2. There are only two terminals, B+ and B-. No other special signal input is required. It can work just by turning on the power.

[0025] 3. The system has strong versatility. This solution is applicable to both 12V battery systems and 24V battery systems, and can be used in a wider range of vehicle models. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0028] Example

[0029] See also Figure 1 , the utility model provides a technical solution:

[0030] The system B+ and B- terminals are connected between the positive and negative electrodes of the battery to supply power to the system control circuit.

[0031] Capacitors C3 and C4 are used to filter the B+ input.

[0032] Resistor R13, Zener diode ZD1, and MOS tube Q1 form a power reverse connection protection circuit. When the system is connected normally, PMOS tube Q1 is normally turned on, and the B+ terminal and B- circuit loop are connected. When the positive and negative poles of the system power supply are reversed, the gate of PMOS tube Q1 is high level, Vgs>0, PMOS tube Q1 is cut off, and the power supply and the subsequent load cannot form a loop, which can protect the circuit safety.

[0033] Preferably, a PMOS tube Q1 is used as a conducting tube. The voltage drop of the PMOS tube after conduction is much smaller than the voltage drop of the diode, and the voltage on the load is close to the power supply. The Zener diode is used to limit the Vsg voltage within a safe range.

[0034] Resistors R3, R8, R14, transistor T1, MOS tube Q2, and Zener diode ZD4 form an overvoltage protection circuit. When the system power supply voltage is within the normal operating range, Zener diode ZD4 is in a non-conducting state, transistor T1 is in a cut-off state, MOS tube Q2 is normally turned on, and the current at the B+ terminal can supply power to the subsequent circuit through MOS tube Q2. When the voltage at the B+ terminal exceeds the set value (which can be adjusted by the voltage regulation value of the selected Zener diode ZD4), Zener diode ZD4 is turned on. Transistor T1 is then turned on, and its saturation voltage drop Vec value is very low (<0.3V), and the Vsg of MOS tube Q2 is clamped within the Vce voltage value, causing MOS tube Q2 to be cut off. The voltage at the B+ terminal cannot continue to be transmitted to the subsequent circuit, thus playing the role of overvoltage protection. Resistors R3 and R8 are used to provide current limiting protection for Zener diode ZD4.

[0035] The first stator coil 1, resistors R4, R11, Zener diode ZD2, and MOS tube Q4 form a phase drive circuit. The phase current path is B+ terminal → first stator coil 1 → MOS tube Q4 → GND (B- terminal). Zener diode ZD2 is used to protect MOS tube Q4. The second stator coil 2, resistors R5, R10, Zener diode ZD3, and MOS tube Q3 form another phase drive circuit. The phase current path is B+ terminal → second stator coil 2 → MOS tube Q3 → GND (B- terminal). Zener diode ZD3 is used to protect MOS tube Q4. The two phase drive circuits are controlled by the alternating switching of transistors T3 and T4. At the same time, only one phase drive circuit is in working state, and the other is in off state. The two stator phase currents are alternately turned on to control the rotation of the rotor of the water pump.

[0036] Resistors R1, R2, R6, R7, R9, R15, R16, R17, R18, capacitors C1, C2, transistors T2, T3, T4 and Hall element H1 form a commutation circuit. The series combination of capacitors C1 and R2 and the series combination of capacitors C2 and resistor R1 are used to absorb the pulse caused by the switching of the MOS tube. The Hall element H1 is used to sense the rotor magnetic pole signal of the water pump. When the Hall element H1 does not sense the magnetic signal, the OUT end of H1 outputs a high-level signal, the transistor T2 is saturated and turned on, and the transistor T3 is turned off because the base voltage is pulled down by T2. The MOS tube Q4 is in the on state, and the first stator coil 1 is in the on state. The high-level signal at the OUT end of the Hall element H1 is divided by resistors R15 and R17 to turn on the transistor T4, the gate voltage of the MOS tube Q3 is pulled down by T4, Q3 is turned off, and the second stator coil 2 is in the off state.

[0037] When the Hall element H1 senses a magnetic signal, the OUT terminal of H1 outputs a low-level signal, the transistor T2 is turned off, the voltage at the B+ terminal turns on the transistor T3, and the MOS tube Q4 is turned off because the gate voltage is pulled down by the transistor T3, and the first stator coil 1 is in the off state. At the same time, due to the low-level signal at the OUT terminal of the Hall element H1, the transistor T4 is turned off, the MOS tube Q3 is turned on, and the second stator coil 2 is in the on state.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electronic water pump controller circuit, comprising a B+ terminal and a B- terminal for power supply, characterized in that: Two phase drive circuits for alternately conducting and controlling the rotation of the water pump rotor and a phase switching circuit for controlling the phase drive circuit are connected between the B+ terminal and the B- terminal; The two phase driving circuits respectively include a MOS transistor Q3 and a MOS transistor Q4; The gate of the MOS tube Q3 is respectively connected to a resistor R10 and a Zener diode ZD3 and both are grounded; the drain of the MOS tube Q3 is connected to a second stator coil (2); the other end of the second stator coil (2) is connected to the B+ terminal; the source of the MOS tube Q3 is grounded; and a resistor R5 is connected between the gate and drain of the MOS tube Q3; The gate of the MOS tube Q4 is respectively connected to a resistor R11 and a Zener diode ZD2 and both are grounded; the drain of the MOS tube Q4 is connected to a first stator coil (1); the other end of the first stator coil (1) is connected to the B+ terminal; the source of the MOS tube Q4 is grounded; and a resistor R4 is connected between the gate and drain of the MOS tube Q3; The commutation circuit includes a Hall element H1; The V+ end of the Hall element H1 is connected to a resistor R6, the Out end of the Hall element H1 is connected to resistors R7, R12, R15 and R17, the resistor R7 is connected to the B+ end, the resistors R15 and R17 are grounded, the other end of the resistor R12 is connected to the base of the transistor T2, the collector of the transistor T2 is connected to resistors R9, R16 and R18, the resistor R9 is connected to the B+ end, the resistors R16 and R18 are grounded, the resistor R7 is connected to the B+ end, the resistors R15 and R17 are grounded, the other end of the resistor R12 is connected to the base of the transistor T2, the collector of the transistor T2 is connected to resistors R9, R16 and R18, the resistor R9 is connected to the B+ end, the resistors R16 and The base of the transistor T3 is connected between the resistor R18, the emitter of the transistor T3 is grounded, the collector of the transistor T3 is connected to the B+ terminal through the resistor R4 and the first stator coil (1), the base of the transistor T4 is connected between the resistor R15 and the resistor R17, the capacitor C1 and the resistor R2 are connected between the collector of the transistor T4 and the first stator coil (1), and the capacitor C2 and the resistor R1 are connected between the collector of the transistor T3 and the second stator coil (2).

2. An electronic water pump controller circuit according to claim 1, characterized in that: A power supply reverse connection protection circuit and an overvoltage protection circuit are also connected between the B+ terminal and the B- terminal.

3. An electronic water pump controller circuit according to claim 2, characterized in that: The power supply reverse connection protection circuit includes a MOS tube Q1; The drain of the MOS transistor Q1 is connected to the B+ terminal, the gate of the MOS transistor Q1 is connected to a resistor R13 and grounded, and a Zener diode ZD1 is connected between the source and the gate of the MOS transistor Q1.

4. An electronic water pump controller circuit according to claim 3, characterized in that: The overvoltage protection circuit includes a transistor T1; A MOS transistor Q2 is connected between the emitter and collector of the transistor T1, a resistor R8, a resistor R3 and a Zener diode ZD4 are connected to the base of the transistor T1, the resistor R3 is connected to the B+ terminal, a resistor R14 is connected to the gate of the MOS transistor Q2 and is grounded, and a drain of the MOS transistor Q2 is connected to the V+ terminal of the Hall element H1 through a resistor R6.

5. The electronic water pump controller circuit according to claim 1, characterized in that: Capacitor C3 and capacitor C4 are connected between the B+ terminal and the B- terminal.

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