CN214850970U - Auxiliary power supply circuit of automobile motor controller - Google Patents

Abstract

The utility model relates to an automobile motor controller's auxiliary power supply circuit. The utility model discloses a T type hinders and holds network and power chip. The method comprises the steps that a T-shaped resistance-capacitance network is connected in series between enabling pins of a start-stop signal input power supply chip and consists of two resistors and a capacitor, wherein the two resistors are connected in series, a start-stop signal is introduced into one end of the resistor connected in series, and the other end of the resistor connected in series is connected with the enabling pins of the power supply chip; one end of the capacitor is connected between the resistors connected in series, and the other end of the capacitor is grounded. The utility model discloses do not need the host computer to provide complicated control circuit and awakening circuit, only utilize original opening to stop control signal and can realize, do not change original system control mode, strong adaptability.

Description

Auxiliary power supply circuit of automobile motor controller

Technical Field

The utility model belongs to the technical field of the electron, a car machine controller's auxiliary power supply circuit is related to.

Background

At present, automobiles are electrified and electrically driven in a stepping way, more and more electric parts are appeared in an automobile system, wherein the proportion of motor parts is high, standby power consumption of an auxiliary power supply of a controller of the parts can also exist even if the motors stop working, and the whole automobile system has very strict requirements on the standby power consumption of automobile electronic parts along with the increasing number of the automobile electronic parts, so that the standby power consumption of the automobile electronic parts is reduced, and the automobile system has important significance for preventing the automobile storage battery from being fed due to electric leakage of the automobile electronic parts during the long-time halt of an automobile engine.

The circuit topology of the automobile motor controller is shown in fig. 1, the power supply of the automobile motor controller can be divided into a main power supply and an auxiliary power supply, the direct-current main power supply is mainly used for supplying power to a motor driving main loop, the auxiliary power supply is mainly used for supplying power to modules such as a microprocessor, a communication chip and a driving chip, when the automobile motor controller stops working, the main power supply does not consume power, and at the moment, the power consumption of the controller is mainly generated by the auxiliary power supply. Meanwhile, the main power supply, the auxiliary power supply and the controller start-stop control signals of the automobile motor controller have strict time sequence requirements, and the physical damage of controller hardware can be caused by improper power-on time sequence.

The method for realizing low power consumption of the conventional automobile electronic system comprises the following steps:

1) the whole automobile controller switches on and off the whole power supply of the automobile electronic controller through the relay, but for high-power automobile electronic components, the high-current relay is high in use cost and short in service life, and the failure rate can be increased.

2) The method has the advantages that the auxiliary power supply of the automobile electronic component controller is independently supplied with power, the on and off of the power supply of the auxiliary power supply are controlled through the relay, the relay is required to be used, the on and off of the relay needs to be matched with strict power-on sequence control, the system cost is increased, the implementation method is complex, and the reliability is low.

3) The low power consumption is realized by adopting a special power management chip (PMIC), the power management chip has extremely low standby power consumption, the awakening of the standby state is generally realized by a CAN, a LIN or a special awakening circuit, the cost is higher, the size of the controller CAN be increased, and the integrated installation of the controller is not facilitated.

Disclosure of Invention

The utility model discloses to prior art's not enough, provide an automobile motor controller's auxiliary power supply circuit.

The utility model provides a technical scheme that technical problem took does:

the method comprises the steps that a T-shaped resistance-capacitance network is connected in series between enabling pins of a start-stop signal input power supply chip and consists of two resistors and a capacitor, wherein the two resistors are connected in series, a start-stop signal is introduced into one end of the resistor connected in series, and the other end of the resistor connected in series is connected with the enabling pins of the power supply chip; one end of the capacitor is connected between the resistors connected in series, and the other end of the capacitor is grounded.

The utility model has the advantages that:

1) the utility model discloses do not need the host computer to provide complicated control circuit and awakening circuit, only utilize original opening to stop control signal and can realize, do not change original system control mode, strong adaptability.

2) The implementation method is simple and reliable, and the auxiliary power supply is turned off simultaneously when the controller is in a shutdown state, so that the low standby power consumption of the controller is realized.

3) The problem that an inverter circuit is not reliably turned off due to hard turn-off of a power supply is solved by a designed T-shaped resistance-capacitance network.

Drawings

FIG. 1 is a circuit topology of an automotive motor controller as a graph;

fig. 2 is a schematic circuit diagram according to an embodiment of the present invention.

Detailed Description

The invention realizes a low-power consumption auxiliary power supply circuit of an automobile motor controller, and the schematic diagram is shown in figure 2:

the design concept of the utility model is as follows: whether the auxiliary power supply control chip works or not is controlled by a start-stop control signal of a motor controller, namely when the start-stop signal is effective, the auxiliary power supply chip enables to work and provides power supply for the MCU main control module; when the start-stop signal is invalid, the auxiliary power supply chip stops working, the power supply of the MCU master control module is cut off, and the whole controller is in a low standby power consumption state. The start-stop signal for controlling the auxiliary power supply to work can support logic level, analog voltage and the like, and can avoid using a complex special wake-up circuit for wake-up.

According to the technical concept, the present embodiment adopts two resistors R1, R2 and a capacitor C2 to form a T-type resistor-capacitor network, and performs delay enable control on an enable pin of the power conversion chip, where the resistors R1 and R2 are connected in series, one end of the resistor is connected to a start signal, the other end of the resistor is connected to the enable pin of the power chip IC1, and meanwhile, one end of the capacitor C2 is connected between the resistors R1 and R2, and the other end of the capacitor is grounded, so as to achieve the purpose of delay, an output portion of the power chip IC1 belongs to the prior art, and is not described herein again.

The specific working principle of this embodiment is as follows:

a) when a starting signal is enabled, the capacitor C1 is charged through the resistor R1, the capacitor R1 enables an enabling pin of the power chip IC1 through the resistor R2, when the voltage is higher than the enabling threshold voltage of the power chip IC1, the power supply works, the MCU master control module obtains power supply, the MCU chip is electrified and initialized, a starting and stopping signal is received, and the motor enters a to-be-started working state.

b) When the start signal is off, the motor enters a rest state where it is maintained at the start voltage due to the capacitor C1 being charged. After the starting signal is turned off, the capacitor C1 discharges through the resistor R1 and the resistor R2, and the discharge completion time can be adjusted by adjusting the values of the resistor R1, the resistor R2 and the capacitor C1. After the starting control signal is turned off, the auxiliary power supply can work for a period of time in a delayed mode according to the discharge time of the T-shaped resistance-capacitance network, and then the auxiliary power supply is turned off, and the MCU can achieve reliable turn-off of the motor inverter circuit in the time delay device.

Claims (1)

1. The utility model provides an automobile motor controller's auxiliary power supply circuit, includes T type resistance-capacitance network and power chip, its characterized in that:

the method comprises the steps that a T-shaped resistance-capacitance network is connected in series between enabling pins of a start-stop signal input power supply chip and consists of two resistors and a capacitor, wherein the two resistors are connected in series, a start-stop signal is introduced into one end of the resistor connected in series, and the other end of the resistor connected in series is connected with the enabling pins of the power supply chip; one end of the capacitor is connected between the resistors connected in series, and the other end of the capacitor is grounded.

Images