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Bus voltage sampling apparatus

A sampling device, bus voltage technology, applied in the direction of conversion equipment without intermediate conversion to AC, etc., can solve the problems of long low voltage time, long charge and discharge time, short discharge time, etc.

Inactive Publication Date: 2014-09-10
LS INDAL SYST WUXI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

in such as Figure 5A As shown, when the capacity of capacitor C is small, although the charging time is short, the discharging time is also very short, and the low voltage time between pulses (between one pulse and the next pulse) is long, which causes the control unit to misjudge the undervoltage
On the other hand, if Figure 5B As shown, when the capacity of the capacitor C is large, the charging and discharging time is long, which cannot meet the requirements of fast response.

Method used

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Embodiment Construction

[0018] Below, refer to Figure 1~3 The bus voltage sampling device of the present invention will be described.

[0019] refer to figure 1 , The bus voltage sampling device of the present invention is mainly composed of first to seventh resistors (voltage dividing resistors and bias resistors) R1 to R7, two transistors and a follower. The voltage input at the input terminal DC_T is a DC pulse voltage that is scaled down and isolated from the DC bus voltages DCP and DCN through the transformer T, wherein the output terminal DC0 of the bus voltage sampling device can be output from the final output terminal DC through the follower F. In addition, the voltage input at the input terminal DC_T is not limited to the DC bus voltage DCP, DCN through the transformer T scaled down the isolated output DC pulse voltage, you can also use other isolation measurement methods such as optocoupler to measure the DC bus voltage DCP, DCN The output DC pulse voltage is used as the voltage input ...

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Abstract

The invention provides a bus voltage sampling apparatus capable of controlling charge and discharge time to realize rapid charge and slow discharge so as to realize rapid response. The apparatus is mainly composed of resistors (voltage dividing resistors and bias resistors) from a first resistor to a seventh resistor, two triodes and followers. Voltages input at an input end are pulse voltages transformed through a transformer T from DC bus voltages. The voltages at the output end of the bus voltage sampling apparatus can be finally output by an output end via a follower F.

Description

technical field [0001] A bus voltage sampling device is provided. Background technique [0002] In order to protect the frequency converter connected to the power grid, the bus voltage of the power grid should be sampled, and the frequency converter should be controlled according to the sampling result. When the grid input voltage fluctuates or the motor braking time is set too short, the DC bus voltage input to the inverter will generate voltage spikes or undervoltage, which will damage the components of the inverter and affect the reliability of the inverter. Therefore, we need to detect the DC bus voltage to control the switch of the inverter. For frequency converters, overvoltage is more harmful than bus undervoltage. Therefore, when an overvoltage occurs, the response time must be fast, and the operation of the inverter is stopped by inputting the output voltage (sampling voltage) of the sampling device to the control device (such as CPU). [0003] At present, there ...

Claims

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Application Information

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IPC IPC(8): H02M3/07
Inventor 成爱军
Owner LS INDAL SYST WUXI
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