Wake-up circuit on vehicle-mounted motor controller

Abstract

A wake-up circuit on a vehicle-mounted motor controller comprises a triode, a first resistor and a first capacitor, the first resistor and the first capacitor are sequentially connected between a wake-up signal input end of the controller and a base electrode of the triode in series, a second resistor is connected between a collector electrode of the triode and a wake-up signal end of a single chip microcomputer, and the first resistor and the second capacitor are connected in series. The emitter of the triode is grounded, a third resistor is connected between the base of the triode and the grounding end, a third capacitor is connected between the wake-up signal end of the single-chip microcomputer and the grounding end, and a fourth resistor is connected between the wake-up signal input end of the controller and the detection signal end of the single-chip microcomputer. A fifth resistor is connected between the detection signal end and the grounding end of the single-chip microcomputer, and a second capacitor is connected between the detection signal end and the grounding end of the single-chip microcomputer. According to the utility model, the independent wake-up circuit on the vehicle-mounted motor controller is established, the applicability is strong, and the cost is low.

Description

Technical Field

[0001] The utility model relates to the field of electricity, in particular to an electronic circuit, in particular to a wake-up circuit on a vehicle-mounted motor controller. Background Art

[0002] In order to meet the power consumption requirements of the whole vehicle under static conditions, the motor controllers on new energy vehicles must have a low-power sleep mode. The wake-up sleep function of the motor controller on the vehicle in the existing technology traditionally requires the use of an integrated power chip with a wake-up function, which is relatively costly and has strong limitations in use. Summary of the invention

[0003] The utility model aims to provide a wake-up circuit on a vehicle motor controller, which is intended to solve the technical problems of high cost and strong limitations of the wake-up integrated circuit in the vehicle motor controller in the prior art.

[0004] The utility model discloses a wake-up circuit on a vehicle motor controller, comprising a transistor, a first resistor and a first capacitor, and is characterized in that: the first resistor and the first capacitor are sequentially connected in series between a controller wake-up signal input terminal and a base of the transistor, a second resistor is connected between the collector of the transistor and a single-chip wake-up signal terminal, the emitter of the transistor is grounded, a third resistor is connected between the base of the transistor and the ground terminal, a third capacitor is connected between the single-chip wake-up signal terminal and the ground terminal, a fourth resistor is connected between the controller wake-up signal input terminal and a single-chip detection signal terminal, a fifth resistor is connected between the single-chip detection signal terminal and the ground terminal, and a second capacitor is connected between the single-chip detection signal terminal and the ground terminal.

[0005] The controller's normal power signal terminal is selected through a sixth resistor. When the controller needs to have a sleep wake-up function, the sixth resistor is not connected. When the controller does not need to have a sleep wake-up function, the sixth resistor is short-circuited between the controller's normal power signal terminal and the controller wake-up signal input terminal.

[0006] Compared with the prior art, the utility model has positive and obvious effects: the utility model builds an independent wake-up circuit on a vehicle-mounted motor controller, which has strong applicability and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 The utility model discloses a circuit diagram of a wake-up circuit on a vehicle-mounted motor controller. DETAILED DESCRIPTION

[0008] The following embodiments will further illustrate the present invention, but are not intended to limit the present invention.

[0009] like Figure 1 As shown, this embodiment provides a wake-up circuit on a vehicle motor controller, including a transistor Q1, a first resistor R114 and a first capacitor C135, characterized in that: the first resistor R114 and the first capacitor C135 are sequentially connected in series between the controller wake-up signal input terminal KL15 and the base of the transistor Q1, a second resistor R116 is connected between the collector of the transistor Q1 and the single-chip wake-up signal terminal XRSTN, the emitter of the transistor Q1 is grounded, a third resistor R115 is connected between the base of the transistor Q1 and the ground terminal, a third capacitor C139 is connected between the single-chip wake-up signal terminal XRSTN and the ground terminal, and a fourth resistor R116 is connected between the base of the transistor Q1 and the ground terminal. Resistor R9 is connected between the controller wake-up signal input terminal KL15 and the single-chip computer detection signal terminal K15-DET, a fifth resistor R112 is connected between the single-chip computer detection signal terminal K15-DET and the ground terminal, a second capacitor C133 is connected between the single-chip computer detection signal terminal K15-DET and the ground terminal, and the controller normal power signal terminal UB_IN is selected through a sixth resistor R113. When the controller needs to have a sleep wake-up function, the sixth resistor R113 is selected not to be connected. When the controller does not need to have a sleep wake-up function, the sixth resistor R113 is selected to be short-circuited between the controller normal power signal terminal UB_IN and the controller wake-up signal input terminal KL15.

[0010] The working principle of this embodiment is as follows: the controller's normal power signal terminal UB_IN is selected through the sixth resistor R113. When the controller needs to have a sleep wake-up function, the sixth resistor R113 is not connected. When the controller wake-up signal input terminal KL15 is at a low level, the single-chip computer detection signal terminal K15-DET is collected through the resistor-capacitor network composed of the fourth resistor R9, the fifth resistor R112 and the second capacitor C133 to obtain a low level. The single-chip computer enters the sleep mode to reduce the power consumption of the entire system. The resistor-capacitor network mainly plays a voltage dividing role, so that the single-chip computer is within the normal working voltage range, and the signal is low-pass filtered to prevent false triggering. The selection of the resistor and capacitor is determined according to the system operating voltage and the single-chip computer operating voltage; when the controller wake-up signal input terminal KL15 is at a high level, the single-chip computer detection signal terminal K15- DET collects a high level through the RC network composed of the fourth resistor R9, the first resistor R112 and the second capacitor C133. In addition, the first capacitor C135 is charged through the first resistor R114, the first capacitor C135 and the third resistor R115. Since the voltages on both sides of the capacitor cannot change suddenly, the base of the transistor Q1 instantly reaches a high level, and the microcontroller wake-up signal terminal XRSTN is pulled to a low level through the second resistor R116. The second resistor R116 also plays a role in current limiting, ensuring that the current passing through the CE terminal of the transistor is within the range allowed by the device. After the microcontroller wake-up signal terminal XRSTN receives a low-level pulse, the microcontroller is awakened. As the first capacitor C135 is continuously charged, the base voltage of the transistor Q1 will continue to decrease until it is lower than the limit of the transistor Q1 conduction. At this time, the transistor Q1 CE is disconnected, the microcontroller wake-up signal terminal XRSTN is restored to a high level, and the microcontroller enters the working mode;

[0011] When the controller does not need to have the sleep wake-up function, the sixth resistor R113 is short-circuited between the controller normal power signal terminal UB_IN and the controller wake-up signal input terminal KL15.

[0012] 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 wake-up circuit on a vehicle motor controller, comprising a transistor, a first resistor and a first capacitor, characterized in that: The first resistor and the first capacitor are connected in series between the controller wake-up signal input terminal and the base of the transistor in sequence, a second resistor is connected between the collector of the transistor and the microcontroller wake-up signal terminal, the emitter of the transistor is grounded, a third resistor is connected between the base of the transistor and the ground terminal, a third capacitor is connected between the microcontroller wake-up signal terminal and the ground terminal, a fourth resistor is connected between the controller wake-up signal input terminal and the microcontroller detection signal terminal, a fifth resistor is connected between the microcontroller detection signal terminal and the ground terminal, and a second capacitor is connected between the microcontroller detection signal terminal and the ground terminal.

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