CN210155198U

CN210155198U - High-voltage acquisition circuit of vehicle controller

Info

Publication number: CN210155198U
Application number: CN201920815802.6U
Authority: CN
Inventors: 吴佳杰
Original assignee: Shandou New Energy Technology Shanghai Co Ltd
Current assignee: Shandou New Energy Technology Shanghai Co Ltd
Priority date: 2019-06-01
Filing date: 2019-06-01
Publication date: 2020-03-17
Anticipated expiration: 2029-06-01

Abstract

A high-voltage acquisition circuit of a vehicle controller belongs to the technical field of voltage signal acquisition and comprises a triangular wave generator, a high-voltage signal voltage division circuit, a comparison circuit, an isolation circuit and a capture circuit, wherein bus voltage and three phase line voltages are connected with the high-voltage signal voltage division circuit, the triangular wave generator and the high-voltage signal voltage division circuit are connected into the comparison circuit in parallel, and the comparison circuit, the isolation circuit and the capture circuit are sequentially connected in series. The utility model discloses in, simulate voltage signal with the high pressure side form through high pressure acquisition circuit and turn into the digital signal of low pressure side. The utility model discloses can realize the isolation of high-low pressure side signal, improve the interference killing feature to effectively reduce the controller cost.

Description

High-voltage acquisition circuit of vehicle controller

Technical Field

The utility model relates to a voltage signal gathers technical field's acquisition circuit, especially a can simulate voltage signal with high-pressure side form through high-pressure acquisition circuit and turn into the automobile-used controller high pressure acquisition circuit of the digital signal of low pressure side.

Background

In most high-voltage power supply controllers for new energy vehicles, the acquisition of high-voltage side voltage is involved, for example, in order to reduce system cost, some accessory motor controllers adopt a non-position control mode and need to acquire bus voltage and three-way phase voltage. In the conventional scheme, four high-voltage isolation operational amplifiers are needed to collect the bus voltage and three phase line voltages, so the cost is very high; the same is true for the conditions of bus voltage, multi-path IGBT temperature acquisition and the like in the main drive motor controller.

Disclosure of Invention

The utility model discloses to prior art's is not enough, provides an automobile-used controller high pressure acquisition circuit, through after with high-pressure signal partial pressure and triangle wave carry out the comparison and turn into digital signal to keep apart the chip through the digit of a slice multichannel and shift the high-pressure side signal to the low pressure side, finally acquire one through catching the circuit and have the duty cycle of corresponding relation with the high-pressure signal size, thereby obtain this high-pressure signal's magnitude of voltage.

The utility model discloses a realize through following technical scheme, the utility model discloses a triangular wave generator, high-voltage signal bleeder circuit, comparison circuit, buffer circuit and capture the circuit, busbar voltage and three routes phase line voltage are connected with high-voltage signal bleeder circuit, and triangular wave generator, high-voltage signal bleeder circuit parallel access comparison circuit, buffer circuit and capture the circuit and concatenate together in proper order.

Further, in the present invention, the triangular wave generator is composed of an operational amplifier U1, a resistor R1, R2, R3, R4, R5, R6, and a capacitor C1; the resistors R1 and R2 and the power supply VCC are used for generating bias voltage of triangular wave; the capacitor C1 and the resistors R3, R4, R5 and R6 are used for adjusting the frequency and the output amplitude of the triangular wave.

Furthermore, in the present invention, in the high voltage signal voltage divider circuit, the bus voltage and the three-phase line voltage pass through the voltage dividing resistors R7, R8, R9, R10, R11, R12, R13, and R14 to reduce the high voltage signal to the triangular wave amplitude range.

Further, in the present invention, the comparison circuit converts the analog signal into the PWM signal, and the different voltage values correspond to different duty ratios.

Compared with the prior art, the utility model discloses have following beneficial effect and do: the utility model discloses a high pressure acquisition circuit converts high-pressure side form analog voltage signal into the digital signal of low pressure side, can realize the isolation of high-low pressure side signal, improve the interference killing feature to effectively reduce the controller cost.

Drawings

FIG. 1 is a schematic diagram of the present invention;

FIG. 2 is a schematic diagram of a circuit connection according to an embodiment of the present invention;

wherein: 1. the device comprises a triangular wave generator, 2 a high-voltage signal voltage division circuit, 3 a comparison circuit, 4 an isolation circuit, 5 a capture circuit.

Detailed Description

The embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the embodiments of the present invention are based on the technical solution of the present invention and provide detailed embodiments and specific operation processes, but the scope of the present invention is not limited to the following embodiments.

Examples

Specific embodiment picture 1 and figure 2 show, the utility model discloses a triangular wave generator 1, high-voltage signal bleeder circuit 2, comparison circuit 3, isolating circuit 4 and catching circuit 5, bus voltage and three routes phase line voltage are connected with high-voltage signal bleeder circuit, and triangular wave generator, high-voltage signal bleeder circuit parallel access comparison circuit, isolating circuit and catching circuit concatenate together in proper order.

The triangular wave generator 1 consists of an operational amplifier U1, resistors R1, R2, R3, R4, R5, R6 and a capacitor C1; the resistors R1 and R2 and the power supply VCC are used for generating bias voltage of triangular wave; the capacitor C1 and the resistors R3, R4, R5 and R6 are used for adjusting the frequency and the output amplitude of the triangular wave.

In the high-voltage signal voltage-dividing circuit 2, the bus voltage and the three-phase line voltage pass through voltage-dividing resistors R7, R8, R9, R10, R11, R12, R13, and R14 to reduce the high-voltage signal to the triangular wave amplitude range, and the correspondence relationship is as follows:

V_min＜＜V_in＜＜V_max

vin is a high-voltage division value, and Vmin and Vmax are respectively a minimum value and a maximum value of a triangular wave.

The comparison circuit 3 converts the analog signal into a PWM signal, different voltage values correspond to different duty ratios, the correspondence is shown in the following formula, and the duty ratio increases with the increase of the input voltage:

where Duty is the PWM Duty cycle.

In this embodiment, a four-channel digital isolation chip transfers a high-voltage side PWM signal to a low-voltage side and transmits the high-voltage side PWM signal to a capture circuit, and obtains a duty ratio of the PWM signal by capturing a rising edge and a falling edge of the PWM signal, thereby obtaining voltage values of a bus and a phase line through reverse calculation.

The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention.

Claims

1. A high-voltage acquisition circuit of a vehicle controller is characterized by comprising a triangular wave generator, a high-voltage signal voltage division circuit, a comparison circuit, an isolation circuit and a capture circuit, wherein bus voltage and three phase line voltages are connected with the high-voltage signal voltage division circuit, the triangular wave generator and the high-voltage signal voltage division circuit are connected into the comparison circuit in parallel, and the comparison circuit, the isolation circuit and the capture circuit are sequentially connected in series.

2. The vehicle controller high voltage acquisition circuit according to claim 1, wherein the triangular wave generator is composed of an operational amplifier U1, resistors R1, R2, R3, R4, R5, R6 and a capacitor C1; the resistors R1 and R2 and the power supply VCC are used for generating bias voltage of triangular wave; the capacitor C1 and the resistors R3, R4, R5 and R6 are used for adjusting the frequency and the output amplitude of the triangular wave.

3. The vehicle controller high voltage acquisition circuit according to claim 1, wherein in the high voltage signal voltage division circuit, the bus voltage and the three phase line voltages pass through voltage division resistors R7, R8, R9, R10, R11, R12, R13 and R14 to reduce the high voltage signal to be within the triangular wave amplitude range.

4. The vehicle controller high voltage acquisition circuit according to claim 1, wherein the comparison circuit converts an analog signal into a PWM signal, and different voltage values correspond to different duty ratios.