Battery manager with charging and discharging protection function for electric vehicle

Abstract

A battery manager with a charge and discharge protection function for an electric vehicle is characterized in that a battery discharge circuit is shunted to form a first discharge branch and a second discharge branch, the first discharge branch is mainly provided with a large-current controller, and the second discharge branch is provided with a small-current converter, an instrument, an alarm and the like. The voltages of the two branches are accurately detected, and the quantity of electric charges consumed by discharging can be accurately obtained through integral conversion; through accurate detection of the voltage on the battery charging circuit, the charge quantity received by battery charging can be accurately obtained through integral conversion; the accuracy of the endurance mileage of the electric vehicle can be ensured by accurately calculating the charge quantity of charging and discharging, and the error of the charge quantity of the lead-acid battery with the two-way shunting function can be controlled between 5% and 10% according to actual measurement.

Description

Technical Field

[0001] The invention relates to a battery manager for electric vehicles with charge and discharge protection functions. Background Art

[0002] At present, the batteries used in electric two-wheeled vehicles are mostly lead-acid batteries, which have inaccurate power calculations. Usually, the battery power is reflected only by collecting the battery voltage. In addition, during the charging and discharging process, when the current is abnormal, such as an internal circuit short circuit, it may cause corresponding safety accidents. Battery management involves the safety of the entire vehicle, and existing battery managers basically do not have charging and discharging protection functions. Summary of the Invention

[0003] In order to solve the above-mentioned problems, the present invention provides a battery manager for electric vehicles with charge and discharge protection functions.

[0004] To achieve the above objectives, the present invention provides a battery manager for electric vehicles with charge and discharge protection functions, comprising: A step-down circuit having a VDD input terminal electrically connected to a battery and a 5V output terminal for powering the MCU processor, operational amplifier U2, and operational amplifier U5 after voltage reduction; the MCU processor is capable of receiving at least signal inputs IO-2, IO-4, and IO-6 and executing signal outputs KZ-OUT and KZ-IN; a battery discharge circuit, wherein the battery discharge circuit forms a first discharge branch and a second discharge branch after current is split, and the operating current value of the first discharge branch is larger than that of the second discharge branch; a first voltage acquisition unit and a second voltage acquisition unit, wherein the first voltage acquisition unit is provided on the first discharge branch and transmits the collected voltage to the operational amplifier U2, and the operational amplifier U2 performs a signal output I0-1 according to the voltage of the first voltage acquisition unit; the second voltage acquisition unit is provided on the second discharge branch and transmits the collected voltage to the operational amplifier U2, and the operational amplifier U2 performs a signal output I0-5 according to the voltage of the second voltage acquisition unit; A battery charging circuit and a third voltage acquisition unit, wherein the third voltage acquisition unit is provided on the battery charging circuit and transmits the acquired voltage to the operational amplifier U5, and the operational amplifier U5 performs a signal output I0-3 according to the voltage of the third voltage acquisition unit; a discharge signal conversion unit and a discharge protection unit, wherein the discharge signal conversion unit is used to receive the signal output I0-1 and the signal output I0-5 and execute the signal output IOUT; the discharge protection unit is provided on the battery discharge circuit, and receives the signal output IOUT and the signal output KZ-OUT in real time. The discharge protection unit implements loop conduction control of the battery discharge circuit through MOSFETs Q2 and Q3; a charging protection unit, the charging protection unit being arranged on the battery charging circuit, receiving the signal output I0-3 and the signal output KZ-IN in real time, and implementing loop conduction control of the battery charging circuit through the MOSFET Q9; A power-on detection circuit and a voltage proportional adjustment circuit, wherein the power-on detection circuit establishes a power-on detection electrical connection with the MCU processor through the signal output V, and the voltage proportional adjustment circuit converts the signal output I0-1, the signal output I0-3, and the signal output I0-5 into the signal input IO-2, the signal input IO-4, and the signal input IO-6 in sequence, thereby establishing an electrical connection with the MCU processor.

[0005] Furthermore, it also includes an anti-reverse connection circuit arranged on the battery charging circuit, and the anti-reverse connection circuit is provided with a MOS tube Q8, a resistor R35, a resistor R40, and a voltage regulator diode ZD6. The positive electrode E5+1 and the negative electrode E5-1 of the anti-reverse connection circuit are used to form an electrical connection with the charging input device.

[0006] Furthermore, the battery manager is also provided with a thermistor RX1 for temperature monitoring. The thermistor RX1 forms a series circuit via a series resistor RY1, and the series circuit establishes an electrical connection with the MCU processor via a signal output TX1.

[0007] Furthermore, the buck circuit includes a buck chip U1 and capacitors C3, C4, C5, C6, C7, a diode D1, an inductor L1, resistors RL1, RL2, and RL3 electrically connected to the buck chip U1.

[0008] Furthermore, the first voltage acquisition unit includes electrically connected resistors RS1, RS2, RS3, R2, R6, R8, R10 and capacitor C1; the second voltage acquisition unit includes electrically connected resistors RS4, RS5, RS6, R3, R4, R7, R11 and capacitor C2; the third voltage acquisition unit includes electrically connected resistors RS7, RS8, RS9, R42, R43, R44, R45 and capacitor C10.

[0009] Furthermore, the discharge signal conversion unit is powered by the 5V output end of the step-down circuit, and the discharge signal conversion unit also includes an electrically connected photoelectric coupler U4, a resistor R19, a resistor R21, a resistor R22, a resistor R23, a voltage regulator ZD3, and a transistor Q4.

[0010] Furthermore, the discharge protection unit also includes a transistor Q1, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R20, a voltage regulator ZD1, a voltage regulator ZD2, a capacitor C8, and a capacitor C9 that are electrically connected.

[0011] Furthermore, the charging protection unit also includes electrically connected transistors Q5, Q6, Q7, resistors R24, R25, R26, R27, R28, R34, a Zener diode ZD4, and a Zener diode ZD5.

[0012] Furthermore, the power-on detection circuit includes a resistor R29 and a resistor R36 connected in series. When the ignition switch is locked, the MCU processor receives the signal output V of the power-on detection circuit and executes the signal output KZ-OUT and the signal output KZ-IN.

[0013] Furthermore, the voltage proportional adjustment circuit has three paths, including a first path in which a resistor R30 and a resistor R37 are connected in series to convert the signal output I0-1 into the signal input IO-2, a second path in which a resistor R31 and a resistor R38 are connected in series to convert the signal output I0-3 into the signal input IO-4, and a third path in which a resistor R32 and a resistor R39 are connected in series to convert the signal output I0-5 into the signal input IO-6.

[0014] The beneficial effects of the present invention compared to the prior art are: 1. After the battery discharge circuit is shunted, a first discharge branch and a second discharge branch are formed. The first discharge branch is mainly equipped with a large current controller, and the second discharge branch is equipped with a small current converter, instrument, alarm, etc. The voltages on the two branches are accurately detected, and the amount of charge consumed by discharge can be accurately obtained through integral conversion; by accurately detecting the voltage on the battery charging circuit, the amount of charge received by the battery can be accurately obtained through integral conversion; by accurately calculating the amount of charge during charging and discharging, the accuracy of the electric vehicle's cruising range can be ensured. According to actual measurements, the lead-acid battery with dual-path shunt function can control the error of the charge amount to be between 5% and 10%.

[0015] 2. Both the charging and discharging processes have overcurrent protection functions, and the overcurrent protection points set on the first discharge branch and the second discharge branch are different. Compared with the single discharge circuit, which cannot determine the overcurrent status of the secondary circuit (small current), its protection is stronger and the protection range is wider. It has anti-reverse polarity function during charging; 3. It has power-on detection function, multi-point temperature monitoring function, and self-detection function of MOS tube Q2 and MOS tube Q3. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a connection diagram of the step-down circuit involved; Figure 2 The following is a connection diagram of the MCU processor involved; Figure 3 A schematic diagram showing the connection of the first voltage acquisition unit on the first discharge branch and a schematic diagram showing the connection of the discharge protection unit on the battery discharge circuit are shown; Figure 4 shows a schematic diagram of the connection of the second voltage acquisition unit on the second discharge branch; Figure 5 FIG. 1 is a connection diagram of the operational amplifier U2 involved; Figure 6 is a connection diagram of the discharge signal conversion unit involved; Figure 7 A schematic diagram showing the connection of the third voltage acquisition unit to the battery charging circuit is shown, as well as a schematic diagram showing the connection of the anti-reverse connection circuit and a schematic diagram showing the connection of the charging protection unit to the battery charging circuit; Figure 8 FIG. 1 is a connection diagram of the operational amplifier U5 involved; Figure 9 is a schematic diagram of the power-on detection circuit involved; Figure 10 is a schematic diagram of the voltage proportional regulation circuit involved; Figure 11FIG. 4 is a connection diagram between the thermistor RX1 and the MCU processor. ... DETAILED DESCRIPTION

[0017] like Figure 1 As shown, an embodiment of the present invention provides a battery manager for electric vehicles with charge and discharge protection functions, including a step-down circuit having a VDD input terminal electrically connected to the battery and a 5V output terminal for powering the MCU processor, operational amplifier U2, and operational amplifier U5 after voltage reduction; the step-down circuit includes a step-down chip U1 and capacitors C3, C4, C5, C6, and C7, a diode D1, an inductor L1, and resistors RL1, RL2, and RL3 electrically connected to the step-down chip U1.

[0018] like Figure 2 As shown, the MCU processor can receive signal input IO-2, signal input IO-4, signal input IO-6 and execute signal output KZ-OUT, signal output KZ-IN.

[0019] After shunting, the battery discharge circuit forms a first discharge branch and a second discharge branch. The operating current value of the first discharge branch is larger than that of the second discharge branch. The first discharge branch is mainly equipped with a large current controller, and the second discharge branch is equipped with a small current converter, instrument, alarm, etc.

[0020] like Figure 3 、 Figure 5 As shown, the first voltage acquisition unit is arranged on the first discharge branch and transmits the collected voltage to the operational amplifier U2. The operational amplifier U2 performs a signal output I0-1 according to the voltage of the first voltage acquisition unit. The first voltage acquisition unit includes an electrically connected resistor RS1, a resistor RS2, a resistor RS3, a resistor R2, a resistor R6, a resistor R8, a resistor R10 and a capacitor C1.

[0021] like Figure 4 、 Figure 5 As shown, the second voltage acquisition unit is arranged on the second discharge branch and transmits the collected voltage to the operational amplifier U2. The operational amplifier U2 performs signal output I0-5 according to the voltage of the second voltage acquisition unit; the second voltage acquisition unit includes electrically connected resistors RS4, RS5, RS6, R3, R4, R7, R11 and capacitor C2.

[0022] like Figure 7 、 Figure 8As shown, the third voltage acquisition unit is provided on the battery charging circuit and transmits the collected voltage to the operational amplifier U5. The operational amplifier U5 performs a signal output I0-3 according to the voltage of the third voltage acquisition unit. The third voltage acquisition unit includes electrically connected resistors RS7, RS8, RS9, R42, R43, R44, R45, and capacitor C10.

[0023] like Figure 6 As shown, the discharge signal conversion unit is used to receive the signal output I0-1 and the signal output I0-5 and execute the signal output IOUT through the action of the photoelectric coupler U4; the discharge signal conversion unit is powered by the 5V output end of the step-down circuit, and the discharge signal conversion unit also includes an electrically connected resistor R19, a resistor R21, a resistor R22, a resistor R23, a voltage regulator diode ZD3, and a transistor Q4.

[0024] like Figure 3 As shown, the discharge protection unit is provided in the battery discharge circuit. The discharge protection unit receives the signal output IOUT and the signal output KZ-OUT in real time. The discharge protection unit implements loop conduction control of the battery discharge circuit through the transistor Q1, the MOSFET Q2, and the MOSFET Q3. The discharge protection unit also includes electrically connected resistors R13, R14, R15, R16, R17, R18, R20, the Zener diode ZD1, the Zener diode ZD2, the capacitor C8, and the capacitor C9.

[0025] like Figure 7 As shown, the charging protection unit is arranged on the battery charging circuit. The charging protection unit receives the signal output I0-3 and the signal output KZ-IN in real time. The charging protection unit realizes the loop conduction control of the battery charging circuit through transistors Q5, Q6, Q7 and MOSFET Q9. The charging protection unit also includes electrically connected resistors R24, R25, R26, R27, R28, R34, Zener diode ZD4 and ZD5.

[0026] like Figure 9 As shown, the power-on detection circuit establishes a power-on detection electrical connection with the MCU processor through the signal output V. The power-on detection circuit includes a resistor R29 and a resistor R36 connected in series. When the ignition switch is locked, the MCU processor receives the signal output V of the power-on detection circuit and executes the signal output KZ-OUT and the signal output KZ-IN.

[0027] like Figure 10As shown, the voltage proportional regulation circuit converts the signal output I0-1, signal output I0-3, and signal output I0-5 into signal input IO-2, signal input IO-4, and signal input IO-6 in sequence, thereby establishing an electrical connection with the MCU processor; the voltage proportional regulation circuit has three paths, and the voltage proportional regulation circuit includes a first path composed of a resistor R30 and a resistor R37 connected in series to convert the signal output I0-1 into the signal input IO-2, a second path composed of a resistor R31 and a resistor R38 connected in series to convert the signal output I0-3 into the signal input IO-4, and a third path composed of a resistor R32 and a resistor R39 connected in series to convert the signal output I0-5 into the signal input IO-6.

[0028] like Figure 7 As shown, the battery manager also includes an anti-reverse polarity circuit provided on the battery charging circuit. The anti-reverse polarity circuit is provided with a MOSFET Q8, a resistor R35, a resistor R40, and a Zener diode ZD6. The positive electrode E5+1 and the negative electrode E5-1 of the anti-reverse polarity circuit are used to form an electrical connection with the charging input device.

[0029] like Figure 11 As shown, the battery manager is also provided with a thermistor RX1 for temperature monitoring. The thermistor RX1 forms a series circuit via a series resistor RY1. The series circuit establishes an electrical connection with the MCU processor via a signal output TX1.

[0030] After the battery discharge circuit is shunted, a first discharge branch and a second discharge branch are formed. A large current controller is mainly set on the first discharge branch, and a small current converter, meter, alarm, etc. are set on the second discharge branch. The voltages on the two branches are accurately detected, and the amount of charge consumed by discharge can be accurately obtained through integral conversion; by accurately detecting the voltage on the battery charging circuit, the amount of charge received by the battery charging can be accurately obtained through integral conversion; by accurately calculating the amount of charge charged and discharged, the accuracy of the electric vehicle's cruising range can be ensured. According to actual measurements, the lead-acid battery with a dual-path shunt function can control the error of the charge amount to be between 5% and 10%; the charging and discharging processes have overcurrent protection functions, and the charging has an anti-reverse connection function; it has a power-on detection function, a multi-point temperature monitoring function, and a self-detection function of the MOS tube Q2 and the MOS tube Q3.

[0031] In order to facilitate understanding of the present invention, the following description will be given in conjunction with the accompanying drawings when it is used in practice. Overcurrent protection function during the discharge process: During normal discharge, the signal output KZ-OUT of the MCU processor is at a low level, the transistor Q1 is turned on, and the MOSFET Q2 and MOSFET Q3 are driven to turn on, thereby turning on the loop of the battery discharge circuit; if the voltage of the first voltage acquisition unit is amplified by the operational amplifier U2 and executes the signal output I0-1, or the voltage of the second voltage acquisition unit is amplified by the operational amplifier U2 and executes the signal output I0-5, regardless of whether an overcurrent occurs on the first discharge branch or the second discharge branch, the discharge signal conversion unit receives the signal output I0-1 and the signal output I0-5 and executes the signal output IOUT through the action of the photoelectric coupler U4. The signal output IOUT is at a high level, thereby turning off the transistor Q1, and further turning off the MOSFET Q2 and MOSFET Q3, thereby realizing the overcurrent protection function of the discharge process. This process has the characteristics of rapid response.

[0032] Overcurrent protection function during the charging process: When charging normally, the signal output KZ-IN of the MCU processor is high, the base of the transistor Q7 is high, the transistor Q7 is turned on, the gate of the MOSFET Q9 is low, and the MOSFET Q9 is in the on state. At this time, the signal output I0-3 is less than the limiting voltage of the Zener diode ZD4, the transistor Q5 is in the cut-off state (not conducting), and the transistor Q6 is also in the cut-off state (not conducting); when a short circuit occurs in the charging circuit, the signal output I0-3 will be greater than the limiting voltage of the Zener diode ZD4, the transistor Q5 will turn into the on state, the transistor Q6 will also turn into the on state, the base of the transistor Q7 will become low, the transistor Q7 will no longer be turned on, the gate of the MOSFET Q9 will become high, and the MOSFET Q9 will be turned off, realizing the overcurrent protection function of the charging process. This process has the characteristics of rapid response.

[0033] Charging anti-reverse connection function: When connected in the forward direction, the gate of the MOSFET Q8 is at a high level, at which time the MOSFET Q8 is turned on and charging can be achieved normally; when connected in the reverse direction, the gate of the MOSFET Q8 is at a low level, at which time the MOSFET Q8 cuts off the battery charging circuit and charging cannot be achieved.

[0034] Ignition short-circuit protection function: During ignition, if the current of the second discharge branch is greater than 2A and lasts for more than 0.5S, or the current of the battery discharge circuit is greater than 5A, the circuit output of the battery discharge circuit will be automatically cut off.

[0035] Self-detection function of MOSFET Q2 and MOSFET Q3: When the ignition switch lock signal is detected, the MCU processor performs a high-low level switch on the signal output KZ-OUT according to the built-in program. At the same time, the MCU processor determines whether the signal input IO-4 and the signal input IO-6 have changed. If the signal input IO-4 and the signal input IO-6 have changed, it means that the functions of MOSFET Q2 and MOSFET Q3 are normal. Otherwise, it means that the functions of MOSFET Q2 and MOSFET Q3 are abnormal and the power supply cannot be effectively cut off, and maintenance is required.

[0036] In addition, the MCU processor can control the level of the signal output KZ-OUT and the signal output KZ-IN according to the built-in program to realize the cut-off control of the battery discharge circuit and the battery charging circuit. The control method realized by the built-in program is not as responsive as the direct control method through hardware, but it can be used in combination with other electronic components such as the thermistor RX1 involved in this case. In addition, Figure 11 RX2 and RX3 in the figure also represent thermistors. When the temperature at the temperature monitoring position is abnormal, the MCU processor can control the cutting off of the charge and discharge circuits.

[0037] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A battery manager for electric vehicles with charge and discharge protection functions, characterized by: include A step-down circuit, the step-down circuit having a VDD input terminal electrically connected to a battery and a 5V output terminal for supplying power to an MCU processor, an operational amplifier (U2), and an operational amplifier (U5) after voltage reduction; the MCU processor is capable of at least receiving a signal input (IO-2), a signal input (IO-4), and a signal input (IO-6) and executing a signal output (KZ-OUT) and a signal output (KZ-IN); a battery discharge circuit, wherein the battery discharge circuit forms a first discharge branch and a second discharge branch after current is split, and the operating current value of the first discharge branch is larger than that of the second discharge branch; a first voltage acquisition unit and a second voltage acquisition unit, wherein the first voltage acquisition unit is arranged on the first discharge branch and transmits the collected voltage to the operational amplifier (U2), and the operational amplifier (U2) performs a signal output (I0-1) according to the voltage of the first voltage acquisition unit; the second voltage acquisition unit is arranged on the second discharge branch and transmits the collected voltage to the operational amplifier (U2), and the operational amplifier (U2) performs a signal output (I0-5) according to the voltage of the second voltage acquisition unit; A battery charging circuit and a third voltage acquisition unit, wherein the third voltage acquisition unit is provided on the battery charging circuit and transmits the acquired voltage to the operational amplifier (U5), and the operational amplifier (U5) performs signal output (I0-3) according to the voltage of the third voltage acquisition unit; a discharge signal conversion unit and a discharge protection unit, wherein the discharge signal conversion unit is used to receive the signal output (I0-1) and the signal output (I0-5) and execute a signal output (IOUT); the discharge protection unit is arranged on the battery discharge circuit, and receives the signal output (IOUT) and the signal output (KZ-OUT) in real time. The discharge protection unit realizes loop conduction control of the battery discharge circuit through a MOSFET (Q2) and a MOSFET (Q3); a charging protection unit, the charging protection unit being arranged on the battery charging circuit, the charging protection unit receiving the signal output (I0-3) and the signal output (KZ-IN) in real time, and implementing loop conduction control of the battery charging circuit through a MOSFET (Q9); A power-on detection circuit and a voltage proportional adjustment circuit, wherein the power-on detection circuit establishes a power-on detection electrical connection with the MCU processor via a signal output (V); the voltage proportional adjustment circuit converts the signal output (I0-1), the signal output (I0-3), and the signal output (I0-5) into the signal input (IO-2), the signal input (IO-4), and the signal input (IO-6) in sequence, thereby establishing an electrical connection with the MCU processor.

2. The battery manager for electric vehicles with charge and discharge protection functions according to claim 1, characterized in that: The invention also includes an anti-reverse connection circuit arranged on the battery charging circuit, wherein the anti-reverse connection circuit is provided with a MOS tube (Q8), a resistor (R35), a resistor (R40), and a voltage-stabilizing diode (ZD6), and the positive electrode (E5+1) and the negative electrode (E5-1) of the anti-reverse connection circuit are used to form an electrical connection with a charging input device.

3. The battery manager for electric vehicles with charge and discharge protection functions according to claim 1, characterized in that: The battery manager is also provided with a thermistor (RX1) for temperature monitoring. The thermistor (RX1) forms a series circuit via a series resistor (RY1). The series circuit establishes an electrical connection with the MCU processor via a signal output (TX1).

4. The battery manager for electric vehicles with charge and discharge protection functions according to claim 1, characterized in that: The step-down circuit comprises a step-down chip (U1) and a capacitor (C3), a capacitor (C4), a capacitor (C5), a capacitor (C6), a capacitor (C7), a diode (D1), an inductor (L1), a resistor (RL1), a resistor (RL2), and a resistor (RL3) electrically connected to the step-down chip (U1).

5. The battery manager for electric vehicles with charge and discharge protection functions according to claim 1, characterized in that: The first voltage acquisition unit includes an electrically connected resistor (RS1), a resistor (RS2), a resistor (RS3), a resistor (R2), a resistor (R6), a resistor (R8), a resistor (R10) and a capacitor (C1); the second voltage acquisition unit includes an electrically connected resistor (RS4), a resistor (RS5), a resistor (RS6), a resistor (R3), a resistor (R4), a resistor (R7), a resistor (R11) and a capacitor (C2); the third voltage acquisition unit includes an electrically connected resistor (RS7), a resistor (RS8), a resistor (RS9), a resistor (R42), a resistor (R43), a resistor (R44), a resistor (R45) and a capacitor (C10).

6. The battery manager for electric vehicles with charge and discharge protection functions according to claim 5, characterized in that: The discharge signal conversion unit is powered by the 5V output end of the step-down circuit, and further comprises an electrically connected photoelectric coupler (U4), a resistor (R19), a resistor (R21), a resistor (R22), a resistor (R23), a voltage regulator (ZD3), and a transistor (Q4).

7. The battery manager for electric vehicles with charge and discharge protection functions according to claim 6, characterized in that: The discharge protection unit further includes an electrically connected transistor (Q1), a resistor (R13), a resistor (R14), a resistor (R15), a resistor (R16), a resistor (R17), a resistor (R18), a resistor (R20), a voltage regulator (ZD1), a voltage regulator (ZD2), a capacitor (C8), and a capacitor (C9).

8. The battery manager for electric vehicles with charge and discharge protection functions according to claim 7, characterized in that: The charging protection unit further includes an electrically connected transistor (Q5), a transistor (Q6), a transistor (Q7), a resistor (R24), a resistor (R25), a resistor (R26), a resistor (R27), a resistor (R28), a resistor (R34), a voltage regulator (ZD4), and a voltage regulator (ZD5).

9. The battery manager for electric vehicles with charge and discharge protection functions according to claim 8, characterized in that: The power-on detection circuit includes a resistor (R29) and a resistor (R36) connected in series. When the ignition switch is locked, the MCU processor receives the signal output (V) of the power-on detection circuit and executes the signal output (KZ-OUT) and the signal output (KZ-IN).

10. The battery manager for electric vehicles with charge and discharge protection functions according to claim 9, characterized in that: The voltage proportional regulation circuit has three paths, including a first path in which a resistor (R30) and a resistor (R37) are connected in series to convert a signal output (I0-1) into a signal input (IO-2), a second path in which a resistor (R31) and a resistor (R38) are connected in series to convert a signal output (I0-3) into a signal input (IO-4), and a third path in which a resistor (R32) and a resistor (R39) are connected in series to convert a signal output (I0-5) into a signal input (IO-6).

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