阅读说明：本技术 多通道电压隔离分压器 (Multi-channel voltage isolation voltage divider ) 是由 谢振华 黄惠根 何普全 孙海旺 马蕾 于 2021-07-10 设计创作，主要内容包括：本发明涉及一种多通道电压隔离分压器,包括不止一个的电压隔离分压器单元,电压隔离分压器单元包括不止一个的电压霍尔传感器,不止一个的电压霍尔传感器级联,输入端电压经电阻串分压后接入首端电压霍尔传感器的一次侧输入端,末端电压霍尔传感器的测量端连接至后端的数据采集系统。通过在大电压级别的试验电压和小电压级别的数据采集系统的中间设置不止一个的电压霍尔传感器,由于电压霍尔传感器的隔离性能好,测量精度高,成本相对较低。(The invention relates to a multi-channel voltage isolation voltage divider, which comprises more than one voltage isolation voltage divider unit, wherein the voltage isolation voltage divider unit comprises more than one voltage Hall sensor, the more than one voltage Hall sensors are cascaded, the voltage of an input end is connected to the primary side input end of a head-end voltage Hall sensor after being divided by a resistor string, and the measuring end of a tail-end voltage Hall sensor is connected to a data acquisition system at the rear end. More than one voltage Hall sensor is arranged between the test voltage with large voltage level and the data acquisition system with small voltage level, and the voltage Hall sensors have good isolation performance, high measurement precision and relatively low cost.)

1. A multi-channel voltage isolating divider, comprising: the voltage isolation voltage divider unit comprises more than one voltage Hall sensor, the more than one voltage Hall sensor are cascaded, the voltage of an input end is divided by a resistor string and then is connected to the primary side input end of the head end voltage Hall sensor, and the measuring end of the tail end voltage Hall sensor is connected to a data acquisition system at the rear end.

2. The multi-channel voltage isolating divider of claim 1, wherein: the voltage isolation voltage divider unit comprises a first voltage Hall sensor and a second voltage Hall sensor, wherein the voltage of an input end is divided by a resistor string and then is connected to the input end at the primary side of the first voltage Hall sensor, a current signal output by the measuring end of the first voltage Hall sensor is converted into a voltage signal and then is connected to the input end at the primary side of the second voltage Hall sensor, and a current signal output by the measuring end of the second voltage Hall sensor is converted into an adjustable measuring voltage.

3. The multi-channel voltage isolating divider according to claim 1 or 2, characterized in that: the more than one voltage Hall sensors are separately powered by independent isolation transformers.

4. The multi-channel voltage isolating divider of claim 3, wherein: the first voltage Hall sensor and the second voltage Hall sensor are arranged on the circuit board, and the circuit board is hollow at the position between the primary and the secondary of the first voltage Hall sensor and the position between the primary and the secondary of the second voltage Hall sensor.

Technical Field

The invention relates to a multi-channel voltage isolation voltage divider.

Background

In the type test of a low-voltage electrical appliance, a plurality of projects need to acquire voltage and current waveforms in real time, such as a short-circuit performance test, an electrical service life test and the like, in the test projects, the voltage of an acquisition port of a data acquisition system is generally a small voltage signal, and the test voltage is generally between 1500V and 110V, so that the test voltage cannot be directly connected to the data acquisition system and needs to be processed in an intermediate link. One method in the prior art is to use a resistor to divide voltage and then connect a test voltage, which is very economical and practical, but because a physical isolation structure is not arranged between the test voltage and a data acquisition system, the transient overvoltage after the low-voltage electrical appliance is turned off is very high during a short-circuit test, and an acquisition port of the data acquisition system is easily burnt out; the other method is to encapsulate the special device into a voltage acquisition module, convert the analog signal into an optical fiber signal, and then restore the optical fiber signal into an analog signal at the inlet end of the data acquisition system and send the analog signal into the data acquisition system.

Disclosure of Invention

In view of the above, the present invention provides a multi-channel voltage isolation voltage divider with safety test, high accuracy and relatively low cost.

In order to achieve the above object, the present invention adopts such a multi-channel voltage isolation voltage divider, which comprises more than one voltage isolation voltage divider unit, wherein the voltage isolation voltage divider unit comprises more than one voltage hall sensor, the more than one voltage hall sensors are cascaded, the voltage at the input end is divided by a resistor string and then is connected to the primary side input end of the first-end voltage hall sensor, and the measuring end of the tail-end voltage hall sensor is connected to the data acquisition system at the rear end. Compared with the prior art, the invention has the beneficial technical effects that: more than one voltage Hall sensor is arranged between the test voltage with large voltage level and the data acquisition system with small voltage level, and the voltage Hall sensors have good isolation performance, high measurement precision and relatively low cost.

Particularly, the voltage isolation voltage divider unit comprises a first voltage hall sensor and a second voltage hall sensor, wherein the voltage of the input end is divided by a resistor string and then is connected to the primary side input end of the first voltage hall sensor, a current signal output by the measuring end of the first voltage hall sensor is converted into a voltage signal and then is connected to the primary side input end of the second voltage hall sensor, and a current signal output by the measuring end of the second voltage hall sensor is converted into an adjustable measuring voltage. Through the arrangement of the structure, the two stages of voltage Hall sensors are cascaded, and each stage of Hall sensor can bear certain withstand voltage, so that the impact withstand voltage of the whole system is higher.

In particular, the more than one voltage hall sensors are separately powered by separate isolation transformers. Through the arrangement of the structure, the power supply of each stage of voltage Hall sensor is independent, and the electrical isolation performance between adjacent stages is guaranteed.

Particularly, the first voltage Hall sensor and the second voltage Hall sensor are arranged on a circuit board, and the circuit board is positioned between the primary level and the secondary level of the first voltage Hall sensor and is hollowed out at the position between the primary level and the secondary level of the second voltage Hall sensor. Through the arrangement of the structure, the primary and the secondary of the voltage Hall sensor are hollowed out, and the sufficient safety distance between the primary and the secondary is ensured.

Drawings

FIG. 1 is a circuit diagram of a voltage isolation divider cell in a multi-channel voltage isolation divider of the present invention.

Detailed Description

As shown in fig. 1, a multi-channel voltage isolation voltage divider includes more than one voltage isolation voltage divider unit, where the voltage isolation voltage divider unit includes more than one voltage hall sensor, the more than one voltage hall sensors are cascaded, the voltage at the input end is divided by a resistor string and then is connected to the primary side input end of the first-end voltage hall sensor, and the measurement end of the tail-end voltage hall sensor is connected to the data acquisition system at the rear end.

The voltage isolation voltage divider unit comprises a first voltage Hall sensor and a U1 second voltage Hall sensor U2, voltages J1 and J2 at input ends are divided by resistor strings and then are connected to primary side input ends U1-1 and U1-2 of the first voltage Hall sensor U1, a current signal output by a measuring end U1-5 of the first voltage Hall sensor U1 is converted into a voltage signal and then is connected to primary side input ends U2-1 and U2-2 of the second voltage Hall sensor U2, and a current signal output by a measuring end U2-5 of the second voltage Hall sensor U2 is converted into an adjustable measuring voltage AI 0.

In the above, the voltage hall sensor adopts the model LV25P, the voltage dividing resistor string adopts the high-precision non-inductive resistor with the precision of one thousandth, the inductance between the resistor strings can be reduced, and the overall precision of the voltage isolating voltage divider unit can reach the metering requirement of 0.2 level. In addition, each stage of Hall sensor can bear the withstand voltage of 3.5KV/1min, and the impact withstand voltage of the whole system can reach 15 KV.

The first voltage hall sensor U1 and the second voltage hall sensor U2 are separately powered with separate isolation transformers. The power supply of the first voltage Hall sensor U1 is DC +15V1 and DC-15V1, and the power supply of the second voltage Hall sensor U2 is DC +15V2 and DC-15V 2.

The first voltage Hall sensor U1 and the second voltage Hall sensor U2 are arranged on a circuit board, and the position between the primary and the secondary of the first voltage Hall sensor U1 and the position between the primary and the secondary of the second voltage Hall sensor U2 on the circuit board are hollowed out.