Driving device of exhaust fan on direct-current brushless gas water heater

Abstract

The utility model relates to the technical field of direct-current brushless tools, in particular to a driving device of an exhaust fan on a direct-current brushless gas water heater. The device comprises a power supply module, a switch module and a control module. The power supply module is connected with external electric energy and converts the voltage of the external electric energy into a power supply VCC. The switch module comprises three controllable switches, and the three controllable switches are located between the power supply VCC and a power supply port U1, a power supply port V1 and a power supply port W1 of an exhaust fan on the direct-current brushless gas water heater in a one-to-one correspondence mode. The control module is adaptively connected with the power supply VCC and the switch module, the power supply VCC provides driving electric energy for the control module, and the control module receives the PWM signal and controls the three controllable switches to be switched on or switched off according to the PWM signal, so that an exhaust fan on the direct-current brushless gas water heater is controlled to operate. The device is low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of DC brushless tools, specifically to a driving device for an exhaust fan on a DC brushless gas water heater. Background Art

[0002] At present, most exhaust fans on the market use brushed motors. Due to the characteristics of brushed motors themselves, there are problems with service life limitations. To extend the service life, the improvement scheme proposed by the prior art is to use a brushless motor with a Hall sensor to replace the brushed motor as the motor of the exhaust fan on the gas water heater. However, the price of a brushless motor with a Hall sensor is expensive, resulting in a relatively high cost for the entire scheme. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a driving device for an exhaust fan on a DC brushless gas water heater, and the cost of using this device is relatively low.

[0004] To solve the above problems, the following technical solutions are provided:

[0005] The driving device for an exhaust fan on a DC brushless gas water heater of the utility model is characterized by including:

[0006] A power supply module, used to connect with external electric energy and convert the voltage of the external electric energy into power supply VCC.

[0007] A switch module, containing three controllable switches, and the three controllable switches are located in a one-to-one correspondence between the power supply VCC and the power supply ports U1, V1, and W1 of the exhaust fan on the DC brushless gas water heater.

[0008] A control module, adaptively connected to the power supply VCC and the switch module. The power supply VCC provides driving electric energy for the control module. The control module receives a PWM signal and controls the three controllable switches to conduct or disconnect according to the PWM signal, thereby controlling the operation of the exhaust fan on the DC brushless gas water heater.

[0009] Wherein, the power supply module contains a positive electrode interface and a negative electrode interface. One end of the positive electrode interface is connected to the positive electrode of the external power supply, and the other end of the positive electrode interface forms the power supply VCC. One end of the negative electrode interface is connected to the negative electrode of the external power supply, and a capacitor C1 is connected in series between the other end of the negative electrode interface and the power supply VCC. A capacitor C2 and a diode D1 are connected in parallel at both ends of the capacitor C1.

[0010] The PWM signal is connected to the negative electrode of the diode D2, and the positive electrode of the diode D2 is adaptively connected to the PWM interface of the control module.

[0011] The PWM interface of the control module is respectively connected to one end of resistor R4 and one end of capacitor C4. The other end of resistor R4 is connected to the pull-up power supply VDD5, and the other end of capacitor C4 is grounded.

[0012] The three controllable switches are respectively MOS transistor Q1, MOS transistor Q2 and MOS transistor Q3 of model WSP6067. The 3 pins of MOS transistor Q1, MOS transistor Q2 and MOS transistor Q3 are all connected to the power supply VCC. The 4 pin of MOS transistor Q1 is connected to one end of resistor R1, and the other end of resistor R1 is adaptively connected to the control module for receiving the upper bridge control signal H_PU. The 2 pin of MOS transistor Q1 is connected to one end of resistor R2, and the other end of resistor R2 is adaptively connected to the control module for receiving the lower bridge control signal L_NU. The 5, 6, 7 and 8 pins of MOS transistor Q1 are all connected to the power supply port U1. The 4 pin of MOS transistor Q2 is connected to one end of resistor R5, and the other end of resistor R5 is adaptively connected to the control module for receiving the upper bridge control signal H_PV. The 2 pin of MOS transistor Q2 is connected to one end of resistor R7, and the other end of resistor R7 is adaptively connected to the control module for receiving the lower bridge control signal L_NV. The 5, 6, 7 and 8 pins of MOS transistor Q2 are all connected to the power supply port V1. The 4 pin of MOS transistor Q3 is connected to one end of resistor R8, and the other end of resistor R8 is adaptively connected to the control module for receiving the upper bridge control signal H_PW. The 2 pin of MOS transistor Q3 is connected to one end of resistor R9, and the other end of resistor R9 is adaptively connected to the control module for receiving the lower bridge control signal L_NW. The 5, 6, 7 and 8 pins of MOS transistor Q3 are all connected to the power supply port W1.

[0013] The 1 pins of MOS transistor Q1, MOS transistor Q2 and MOS transistor Q3 are respectively connected to one end of resistor RS1, one end of resistor RS2, one end of resistor R6 and one end of capacitor C3. The other ends of resistor RS1, resistor RS2 and capacitor C3 are grounded. The other end of resistor R6 is connected to the non-inverting input terminal of operational amplifier AMP0. The inverting input terminal of operational amplifier AMP0 is connected to one end of resistor R3, and the other end of resistor R3 is grounded. The output terminal of operational amplifier AMP0 is adaptively connected to the control module for sending the sampling signal AMP0O to the control module.

[0014] The power supply port U1 is connected to one end of the resistor R10. The other end of the resistor R10 is respectively connected to one end of the resistor R13, one end of the capacitor C13, and the control module. The power supply port U1 inputs the signal EMFU to the control module through the resistor R10. The other ends of the resistor R13 and the capacitor C8 are grounded. The power supply port V1 is connected to one end of the resistor R11. The other end of the resistor R11 is respectively connected to one end of the resistor R14, one end of the capacitor C9, and the control module. The power supply port V1 inputs the signal EMFV to the control module through the resistor R11. The other ends of the resistor R14 and the capacitor C9 are grounded. The power supply port W1 is connected to one end of the resistor R12. The other end of the resistor R12 is respectively connected to one end of the resistor R15, one end of the capacitor C10, and the control module. The power supply port W1 inputs the signal EMFW to the control module through the resistor R12. The other ends of the resistor R15 and the capacitor C10 are grounded.

[0015] Adopting the above solution has the following advantages:

[0016] Since the control module of the driving device of the exhaust fan on the DC brushless gas water heater of the present utility model controls the conduction or disconnection of the three controllable switches according to the PWM signal, the operation of the exhaust fan on the DC brushless gas water heater is realized. There is no need to use a Hall sensor with sense, thus greatly reducing the cost of the entire device. Moreover, there is no need to use a brushed motor, and the service life is relatively long. Brief Description of the Drawings

[0017] Figure 1 It is the circuit topology diagram of the driving device of the exhaust fan on the DC brushless gas water heater of the present utility model;

[0018] Figure 2 It is the circuit schematic diagram of the switch module in the driving device of the exhaust fan on the DC brushless gas water heater of the present utility model;

[0019] Figure 3 It is the circuit schematic diagram of the power supply module in the driving device of the exhaust fan on the DC brushless gas water heater of the present utility model;

[0020] Figure 4 It is the circuit schematic diagram of the current sampling module in the driving device of the exhaust fan on the DC brushless gas water heater of the present utility model;

[0021] Figure 5 It is the circuit schematic diagram of the forward and reverse wind collection circuit in the driving device of the exhaust fan on the DC brushless gas water heater of the present utility model;

[0022] Figure 6 It is the circuit schematic diagram of the control module in the driving device of the exhaust fan on the DC brushless gas water heater of the present utility model. Detailed Description of the Invention

[0023] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0024] As Figure 1 shown, the driving device of the upper exhaust fan of the DC brushless gas water heater of the present utility model includes a power supply module 1, a switch module 3, and a control module 2. The power supply module 1 is connected to external electric energy and converts the voltage of the external electric energy into the power supply VCC. The switch module 3 contains three controllable switches, and the three controllable switches are correspondingly located between the power supply VCC and the power supply ports U1, V1, and W1 of the upper exhaust fan 4 of the DC brushless gas water heater. The control module 2 is adaptively connected to the power supply VCC and the switch module. The power supply VCC provides driving electric energy for the control module 2. The control module 2 receives the PWM signal and controls the three controllable switches to conduct or disconnect according to the PWM signal, thereby controlling the operation of the upper exhaust fan 4 of the DC brushless gas water heater.

[0025] As Figure 6 shown, the control module uses a single-chip microcomputer U2 of model FU6832. As Figure 6 shown, the single-chip microcomputer U2 contains a peripheral circuit for driving its operation. The peripheral circuit belongs to the prior art and will not be described in detail here.

[0026] As Figure 3 shown, the power supply module contains a positive electrode interface and a negative electrode interface. One end of the positive electrode interface is connected to the positive electrode of the external power supply, and the other end of the positive electrode interface forms the power supply VCC. One end of the negative electrode interface is connected to the negative electrode of the external power supply, and a capacitor C1 is connected in series between the other end of the negative electrode interface and the power supply VCC. A capacitor C2 and a diode D1 are connected in parallel at both ends of the capacitor C1. In this embodiment, for the convenience of connecting to the external power supply, the positive electrode interface and the negative electrode interface are respectively inserted into the 1st pin and the 2nd pin of the connector P1.

[0027] As Figure 3 and Figure 6 shown, the PWM signal is connected to the negative electrode of the diode D2, and the positive electrode of the diode D2 is connected to the PWM interface of the control module, that is, the 24th pin. In this embodiment, the PWM interface of the control module is respectively connected to one end of a resistor R4 and one end of a capacitor C4. The other end of the resistor R4 is connected to the pull-up power supply VDD5, and the other end of the capacitor C4 is grounded. In this embodiment, for inputting the PWM signal, the negative electrode of the diode D2 is connected to the 3rd pin of the connector P1.

[0028] In this embodiment, one pin of P1 is the positive power supply terminal, the second pin of P1 is the negative power supply terminal, and the third pin of P1 is the rotational speed control input port. C1 and C2 are electrolytic capacitors for bus filtering, connected in parallel with one end connected to the positive electrode and the other end connected to the negative electrode. D1 is a clamping diode for the bus power supply, used to protect the circuit, with one end connected to the positive electrode and the other end connected to the negative electrode. D2 is a switching diode, used for unidirectional conduction in a circuit with a relatively high signal frequency, with one end connected to the third pin of P1 and the other end connected to the 24th pin of the single-chip microcomputer. R4 is a pull-up resistor, with one end connected to the 24th pin of the single-chip microcomputer and the other end connected to VDD5. C4 is a signal glitch filtering capacitor, with one end connected to the 24th pin of the single-chip microcomputer and the other end connected to GND.

[0029] As Figure 2 and Figure 6 shown, the three controllable switches are MOS transistors Q1, Q2, and Q3 of model WSP6067 respectively. The 3rd pins of MOS transistors Q1, Q2, and Q3 are all connected to the power supply VCC. The 4th pin of MOS transistor Q1 is connected to one end of resistor R1, and the other end of resistor R1 is connected to the 2nd pin of the control module, for receiving the upper-bridge control signal H_PU. The 2nd pin of MOS transistor Q1 is connected to one end of resistor R2, and the other end of resistor R2 is connected to the 5th pin of the control module, for receiving the lower-bridge control signal L_NU. The 5th, 6th, 7th, and 8th pins of MOS transistor Q1 are all connected to the power supply port U1. The 4th pin of MOS transistor Q2 is connected to one end of resistor R5, and the other end of resistor R5 is connected to the 3rd pin of the control module, for receiving the upper-bridge control signal H_PV. The 2nd pin of MOS transistor Q2 is connected to one end of resistor R7, and the other end of resistor R7 is connected to the 6th pin of the control module, for receiving the lower-bridge control signal L_NV. The 5th, 6th, 7th, and 8th pins of MOS transistor Q2 are all connected to the power supply port V1. The 4th pin of MOS transistor Q3 is connected to one end of resistor R8, and the other end of resistor R8 is connected to the 4th pin of the control module, for receiving the upper-bridge control signal H_PW. The 2nd pin of MOS transistor Q3 is connected to one end of resistor R9, and the other end of resistor R9 is connected to the 6th pin of the control module, for receiving the lower-bridge control signal L_NW. The 5th, 6th, 7th, and 8th pins of MOS transistor Q3 are all connected to the power supply port W1.

[0030] In this embodiment, Q1, Q2, and Q3 are the MOSs of the three phases (UVW) of the motor. The pin 3 of Q1, Q2, and Q3 is connected to the positive terminal of the power supply. The pins 5, 6, 7, and 8 of Q1, Q2, and Q3 are connected to the three phases of the motor. R1 and R2 are the gate resistors of the upper and lower bridges of phase U, one end is connected to the pins 2 and 5 of the single-chip microcomputer, and the other end is connected to the pins 4 and 2 of Q1; R5 and R7 are the gate resistors of the upper and lower bridges of phase V, one end is connected to the pins 3 and 6 of the single-chip microcomputer, and the other end is connected to the pins 4 and 2 of Q2; R8 and R9 are the gate resistors of the upper and lower bridges of phase W, one end is connected to the pins 4 and 7 of the single-chip microcomputer, and the other end is connected to the pins 4 and 2 of Q3; the single-chip microcomputer drives the six-way output through R1, R2, R5, R7, R8, and R9 to control the on and off of the upper and lower bridges of the three phases, thereby controlling the operation of the motor.

[0031] As Figure 4 and Figure 6 shown, the pin 1 of MOS transistor Q1, MOS transistor Q2, and MOS transistor Q3 are respectively connected to one end of resistor RS1, one end of resistor RS2, one end of resistor R6, and one end of capacitor C3. The other ends of resistor RS1, resistor RS2, and capacitor C3 are grounded. The other end of resistor R6 is connected to the non-inverting input terminal of operational amplifier AMP0. The inverting input terminal of operational amplifier AMP0 is connected to one end of resistor R3, and the other end of resistor R3 is grounded. The output terminal of operational amplifier AMP0 is adaptively connected to the control module for sending a sampling signal AMP0O to the control module. Resistor RS1, resistor RS2, and the operational amplifier constitute a current sampling module.

[0032] In this embodiment, RS1 and RS2 are sampling current resistors. The parallel connection of RS1 and RS2 can reduce the power consumption of a single sampling resistor and the temperature rise of the sampling resistor. One end is connected to the pin 1 of Q1, Q2, and Q3, and the other end is grounded. R3 and R6 are current-limiting resistors. One end is respectively connected to both ends of RS1 and RS2, and the other end is connected to the pins 19 and 20 of the built-in operational amplifier of the single-chip microcomputer. C3 is a filtering capacitor, which can effectively filter out the spike voltage. One end is connected to R3, and the other end is connected to R6. The pin 18 of the single-chip microcomputer is the operational amplifier output port, and the magnitude of the current can be output in the form of an analog voltage.

[0033] As Figure 5 and Figure 6As shown, the power supply port U1 is connected to one end of the resistor R10. The other end of the resistor R10 is respectively connected to one end of the resistor R13, one end of the capacitor C13, and the control module. The power supply port U1 inputs the signal EMFU to the control module through the resistor R10, and the other ends of the resistor R13 and the capacitor C8 are grounded. The power supply port V1 is connected to one end of the resistor R11. The other end of the resistor R11 is respectively connected to one end of the resistor R14, one end of the capacitor C9, and the control module. The power supply port V1 inputs the signal EMFV to the control module through the resistor R11, and the other ends of the resistor R14 and the capacitor C9 are grounded. The power supply port W1 is connected to one end of the resistor R12. The other end of the resistor R12 is respectively connected to one end of the resistor R15, one end of the capacitor C10, and the control module. The power supply port W1 inputs the signal EMFW to the control module through the resistor R12, and the other ends of the resistor R15 and the capacitor C10 are grounded.

[0034] In this embodiment, R10 and R13, R11 and R14, R12 and R15 form a voltage dividing circuit. One ends of R10, R11, and R12 are respectively connected to the motor U, V, and W, and the other ends are respectively connected to the 14th, 15th, and 16th pins of the single-chip microcomputer. One ends of R13, R14, and R15 are respectively connected to the 14th, 15th, and 16th pins of the single-chip microcomputer, and the other ends are connected to GND to form voltage division. The capacitors C8, C9, and C10 are respectively the filter capacitors for U, V, and W.

Claims

1. A driving device for an exhaust fan on a DC brushless gas water heater, characterized in that, Including: A power supply module, which is used to connect with external electric energy and convert the voltage of the external electric energy into power supply VCC; A switch module, which contains three controllable switches. The three controllable switches are located in a one-to-one correspondence between the power supply VCC and the power supply ports U1, V1, and W1 of the exhaust fan of the DC brushless gas water heater; A control module, which is adaptively connected to the power supply VCC and the switch module. The power supply VCC provides driving electric energy for the control module. The control module receives the PWM signal and controls the three controllable switches to conduct or disconnect according to the PWM signal, so as to control the operation of the exhaust fan of the DC brushless gas water heater.

2. The driving device of the upper extraction fan of the DC brushless gas water heater according to claim 1, characterized in that, The power supply module contains a positive electrode interface and a negative electrode interface. One end of the positive electrode interface is connected to the positive electrode of the external power supply, and the other end of the positive electrode interface forms the power supply VCC; One end of the negative electrode interface is connected to the negative electrode of the external power supply, and a capacitor C1 is connected in series between the other end of the negative electrode interface and the power supply VCC. A capacitor C2 and a diode D1 are connected in parallel at both ends of the capacitor C1.

3. The driving device of the upper exhaust fan of the DC brushless gas water heater according to claim 1, characterized in that, The PWM signal is connected to the negative electrode of the diode D2, and the positive electrode of the diode D2 is adaptively connected to the PWM interface of the control module.

4. The driving device of the upper extraction fan of the DC brushless gas water heater according to claim 3, characterized in that, The PWM interface of the control module is respectively connected to one end of a resistor R4 and one end of a capacitor C4. The other end of the resistor R4 is connected to the pull-up power supply VDD5, and the other end of the capacitor C4 is grounded.

5. The drive device of the upper exhaust fan of the DC brushless gas water heater according to claim 1, characterized in that, The three controllable switches are respectively MOS transistors Q1, Q2, and Q3 of model WSP6067. The 3 pins of the MOS transistors Q1, Q2, and Q3 are all connected to the power supply VCC; The 4th pin of the MOS transistor Q1 is connected to one end of a resistor R1, and the other end of the resistor R1 is adaptively connected to the control module for receiving the upper bridge control signal H_PU. The 2nd pin of the MOS transistor Q1 is connected to one end of a resistor R2, and the other end of the resistor R2 is adaptively connected to the control module for receiving the lower bridge control signal L_NU. The 5th, 6th, 7th, and 8th pins of the MOS transistor Q1 are all connected to the power supply port U1; The 4th pin of the MOS transistor Q2 is connected to one end of a resistor R5, and the other end of the resistor R5 is adaptively connected to the control module for receiving the upper bridge control signal H_PV. The 2nd pin of the MOS transistor Q2 is connected to one end of a resistor R7, and the other end of the resistor R7 is adaptively connected to the control module for receiving the lower bridge control signal L_NV. The 5th, 6th, 7th, and 8th pins of the MOS transistor Q2 are all connected to the power supply port V1; The 4th pin of the MOS transistor Q3 is connected to one end of a resistor R8, and the other end of the resistor R8 is adaptively connected to the control module for receiving the upper bridge control signal H_PW. The 2nd pin of the MOS transistor Q3 is connected to one end of a resistor R9, and the other end of the resistor R9 is adaptively connected to the control module for receiving the lower bridge control signal L_NW. The 5th, 6th, 7th, and 8th pins of the MOS transistor Q3 are all connected to the power supply port W1.

6. The driving device of the upper extractor fan of the DC brushless gas water heater according to claim 5, characterized in that, The 1 pins of the MOS transistor Q1, MOS transistor Q2, and MOS transistor Q3 are respectively connected to one end of the resistor RS1, one end of the resistor RS2, one end of the resistor R6, and one end of the capacitor C3. The other ends of the resistor RS1, resistor RS2, and capacitor C3 are grounded; the other end of the resistor R6 is connected to the non-inverting input terminal of the operational amplifier AMP0. The inverting input terminal of the operational amplifier AMP0 is connected to one end of the resistor R3, and the other end of the resistor R3 is grounded; the output terminal of the operational amplifier AMP0 is adaptively connected to the control module for sending a sampling signal AMP0O to the control module.

7. The driving device of the upper extractor fan of the DC brushless gas water heater according to claim 1, characterized in that, The power supply port U1 is connected to one end of the resistor R10. The other end of the resistor R10 is respectively connected to one end of the resistor R13, one end of the capacitor C13, and the control module. The power supply port U1 inputs a signal EMFU to the control module through the resistor R10. The other ends of the resistor R13 and capacitor C8 are grounded; the power supply port V1 is connected to one end of the resistor R11. The other end of the resistor R11 is respectively connected to one end of the resistor R14, one end of the capacitor C9, and the control module. The power supply port V1 inputs a signal EMFV to the control module through the resistor R11. The other ends of the resistor R14 and capacitor C9 are grounded; the power supply port W1 is connected to one end of the resistor R12. The other end of the resistor R12 is respectively connected to one end of the resistor R15, one end of the capacitor C10, and the control module. The power supply port W1 inputs a signal EMFW to the control module through the resistor R12. The other ends of the resistor R15 and capacitor C10 are grounded.

Images