Motor controller sensor power supply output circuit

Abstract

The utility model provides a motor controller sensor power supply output circuit, comprising a voltage stabilizing circuit and a short circuit protection circuit, the voltage stabilizing circuit comprises an LDO device, a first resistor and a second resistor, the LDO device at least comprises an LDO input voltage pin, an LDO enabling pin, an LDO voltage feedback pin, an LDO grounding pin and an LDO output voltage pin, the voltage stabilizing circuit further comprises an input filter circuit and an output filter circuit, and the short circuit protection circuit comprises a PMOS tube, a triode and a sixth capacitor. According to the utility model, functions of short ground protection and short power supply protection are added in the motor controller sensor power supply output circuit, so that the circuit has more comprehensive protection functions.

Description

Technical Field

[0001] The utility model belongs to the field of electricity, in particular to an electronic circuit, in particular to a motor controller sensor power supply output circuit. Background Art

[0002] New energy vehicle systems are equipped with numerous sensors for collecting various electrical signals. The motor controller needs to provide working power for various sensors. The circuit protection function in the sensor power supply output circuit of the motor controller in the prior art is insufficient and cannot provide comprehensive protection for the circuit. Summary of the invention

[0003] The purpose of the utility model is to provide a motor controller sensor power supply output circuit, which is intended to solve the technical problem that the circuit protection function of the motor controller sensor power supply output circuit in the prior art is insufficient and cannot provide a comprehensive protection function for the circuit.

[0004] The utility model discloses a motor controller sensor power supply output circuit, comprising a voltage stabilizing circuit and a short-circuit protection circuit, wherein the voltage stabilizing circuit comprises an LDO device, a first resistor and a second resistor, wherein the LDO device comprises at least an LDO input voltage pin, an enable pin EN, a voltage feedback pin, a ground pin and an LDO output voltage pin, wherein the LDO input voltage pin and the enable pin EN are connected to a power input end, the LDO ground pin is grounded, one end of the first resistor and one end of the second resistor are both connected to the LDO voltage feedback pin, the other end of the first resistor is connected to the LDO output voltage pin, and the other end of the second resistor is grounded;

[0005] The short-circuit protection circuit includes a PMOS tube, a transistor and a sixth capacitor, one end of the sixth capacitor is connected to the LDO output voltage pin, the other end of the sixth capacitor is connected to the base of the transistor, the collector of the transistor is connected to the gate of the PMOS tube, the emitter of the transistor is connected to the source of the PMOS tube and the common end of the LDO output voltage pin, one end of a third resistor is connected to the base of the transistor, the other end of the third resistor is connected to the drain of the PMOS tube, one end of a fourth resistor is connected to the gate of the PMOS tube, the other end of the fourth resistor is grounded, one end of a tenth resistor is connected to the source of the PMOS tube, the other end of the tenth resistor is connected to the drain of the PMOS tube, the input end of a second diode is connected to the drain of the PMOS tube, the output end of the second diode is connected to the power supply output end, one end of a seventh capacitor is connected to the power supply output end, and the other end of the seventh capacitor is grounded.

[0006] Furthermore, the voltage stabilizing circuit also includes an input filtering circuit.

[0007] Furthermore, the input filter circuit includes a first capacitor and a second capacitor, one end of the first capacitor and the second capacitor are both connected to the power input terminal, and the other end is grounded.

[0008] Furthermore, the voltage stabilizing circuit also includes an output filtering circuit.

[0009] Furthermore, the output filter network includes a third capacitor, a fourth capacitor and a fifth capacitor, and one end of the third capacitor, the fourth capacitor and the fifth capacitor are all connected to the LDO output voltage pin, and the other end is grounded.

[0010] Furthermore, the voltage stabilizing circuit further includes a first diode, the input end of the first diode is connected to the LDO output voltage pin, and the output end of the first diode is connected to the power input end.

[0011] Compared with the prior art, the utility model has positive and obvious effects: the utility model adds short-to-ground protection and short-power protection functions to the power supply output circuit of the motor controller sensor, so that the circuit can have more comprehensive protection functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model discloses a circuit diagram of a power supply output circuit of a motor controller sensor. DETAILED DESCRIPTION

[0013] The following embodiments will further illustrate the present invention, but are not intended to limit the present invention.

[0014] like Figure 1As shown, this embodiment provides a motor controller sensor power supply output circuit, including a voltage stabilizing circuit 1 and a short-circuit protection circuit 2, the voltage stabilizing circuit 1 includes an LDO device U1, a first resistor R1 and a second resistor R2, the LDO device U1 includes at least an LDO input voltage pin IN, an LDO enable pin EN, an LDO voltage feedback pin FB, an LDO ground pin GND and an LDO output voltage pin OUT, the LDO input voltage pin IN and the LDO enable pin EN are connected to the power input terminal V24, the LDO ground pin GND is grounded, one end of the first resistor R1 and the second resistor R2 are both connected to the LDO voltage feedback pin FB, the other end of the first resistor R1 is connected to the LDO output voltage pin OUT, and the other end of the second resistor R2 is grounded;

[0015] The short-circuit protection circuit 2 includes a PMOS tube M1, a transistor Q1 and a sixth capacitor C6, one end of the sixth capacitor C6 is connected to the LDO output voltage pin OUT, the other end of the sixth capacitor C6 is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the gate of the PMOS tube M1, the emitter of the transistor Q1 is connected to the source of the PMOS tube M1 and the common end of the LDO output voltage pin OUT, one end of a third resistor R3 is connected to the base of the transistor Q1, and the other end of the third resistor R3 is connected to the PMOS tube M1. The drain of the PMOS tube M1 is connected to the drain of the PMOS tube M1, one end of a fourth resistor R4 is connected to the gate of the PMOS tube M1, the other end of the fourth resistor R4 is grounded, one end of a tenth resistor R10 is connected to the source of the PMOS tube M1, the other end of the tenth resistor R10 is connected to the drain of the PMOS tube M1, an input end of a second diode D2 is connected to the drain of the PMOS tube M1, the output end of the second diode D2 is connected to the power output end V12, one end of a seventh capacitor C7 is connected to the power output end V12, and the other end of the seventh capacitor C7 is grounded.

[0016] Furthermore, the voltage stabilizing circuit 1 also includes an input filter circuit.

[0017] Furthermore, the input filter circuit includes a first capacitor C1 and a second capacitor C2, one end of the first capacitor C1 and the second capacitor C2 are both connected to the power input terminal V24, and the other end is grounded.

[0018] Furthermore, the voltage stabilizing circuit 1 also includes an output filtering circuit.

[0019] Furthermore, the output filter network includes a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5, one end of the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 are connected to the LDO output voltage pin OUT, and the other end is grounded.

[0020] Furthermore, the voltage stabilizing circuit 1 further comprises a first diode D1 , wherein the input end of the first diode D1 is connected to the LDO output voltage pin OUT, and the output end of the first diode D1 is connected to the power input end V24 .

[0021] The working principle of this embodiment is as follows: a 24V voltage is input to the power input terminal V24, and voltage conversion is achieved through the voltage stabilizing circuit 1, the 24V input voltage is converted into a 12V output voltage, and the noise in the output voltage is removed through the input filter network and the output filter network. The first diode D1 is an LDO protection device to prevent the input voltage of the LDO device U1 from being much higher than the output voltage due to the output capacitance being greater than the input capacitance during power-off, thereby protecting the LDO device U1; under normal working conditions, the transistor Q1 is in a closed state, the gate of the PMOS tube M1 is pulled down to the ground by the fourth resistor R4 and thus turned on, and the power output terminal V12 outputs a 12V voltage. When the power output terminal V12 is abnormally short-circuited to the ground, the input terminal of the second diode D2 will also be pulled down to about 0.7V, and the emitter, base, resistor R3, and second diode D2 of the transistor Q1 are D2 and ground form a current loop, so that the transistor Q1 is turned on, and the gate of the PMOS tube M1 is connected to the LDO output voltage pin OUT through the transistor Q1, so that the PMOS tube M1 is turned off, so that the LDO output voltage pin OUT and the power output terminal V12 are disconnected, thereby protecting all front-end devices from being damaged. The function of the capacitor C6 is to provide a start-up hysteresis time for the transistor Q1 at the moment of power-on to prevent the transistor Q1 from being turned on by mistake at the moment of power-on, thereby causing abnormal power output. The function of the resistor R10 is to ensure that the BE terminal level of the transistor Q1 remains consistent after the short-circuit fault disappears, turn off the transistor Q1, and turn on the PMOS tube M1, thereby automatically restoring the power output; the second diode D2 can provide a unidirectional conduction channel for the power output to prevent the power output terminal from being shorted to a power supply higher than 12V and damaging the device.

[0022] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A motor controller sensor power supply output circuit, comprising a voltage stabilizing circuit and a short-circuit protection circuit, characterized in that: The voltage stabilizing circuit includes an LDO device, a first resistor and a second resistor, the LDO device includes at least an LDO input voltage pin, an enable pin EN, a voltage feedback pin, a ground pin and an LDO output voltage pin, the LDO input voltage pin and the enable pin EN are connected to a power input terminal, the LDO ground pin is grounded, one end of the first resistor and one end of the second resistor are both connected to the LDO voltage feedback pin, the other end of the first resistor is connected to the LDO output voltage pin, and the other end of the second resistor is grounded; The short-circuit protection circuit includes a PMOS tube, a transistor and a sixth capacitor, one end of the sixth capacitor is connected to the LDO output voltage pin, the other end of the sixth capacitor is connected to the base of the transistor, the collector of the transistor is connected to the gate of the PMOS tube, the emitter of the transistor is connected to the source of the PMOS tube and the common end of the LDO output voltage pin, one end of a third resistor is connected to the base of the transistor, the other end of the third resistor is connected to the drain of the PMOS tube, one end of a fourth resistor is connected to the gate of the PMOS tube, the other end of the fourth resistor is grounded, one end of a tenth resistor is connected to the source of the PMOS tube, the other end of the tenth resistor is connected to the drain of the PMOS tube, the input end of a second diode is connected to the drain of the PMOS tube, the output end of the second diode is connected to the power supply output end, one end of a seventh capacitor is connected to the power supply output end, and the other end of the seventh capacitor is grounded.

2. A motor controller sensor power supply output circuit as claimed in claim 1, characterized in that: The voltage stabilizing circuit also includes an input filtering circuit.

3. A motor controller sensor power supply output circuit as claimed in claim 2, characterized in that: The input filter circuit comprises a first capacitor and a second capacitor, one end of the first capacitor and the second capacitor are both connected to the power input terminal, and the other end is grounded.

4. A motor controller sensor power supply output circuit as claimed in claim 1, characterized in that: The voltage stabilizing circuit also includes an output filtering circuit.

5. A motor controller sensor power supply output circuit as claimed in claim 4, characterized in that: The output filter network includes a third capacitor, a fourth capacitor and a fifth capacitor. One end of the third capacitor, the fourth capacitor and the fifth capacitor are connected to the LDO output voltage pin, and the other end is grounded.

6. A motor controller sensor power supply output circuit as claimed in claim 1, characterized in that: The voltage stabilizing circuit also includes a first diode, the input end of the first diode is connected to the LDO output voltage pin, and the output end of the first diode is connected to the power input end.

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