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Bus voltage sampling device

A sampling device, bus voltage technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problems of long charging and discharging time, unable to meet fast response, long low voltage time, etc.

Inactive Publication Date: 2016-09-14
LS INDAL SYST WUXI
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  • Abstract
  • Description
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AI Technical Summary

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 To illustrate the bus voltage sampling device of the present invention.

[0019] Reference figure 1 , The bus voltage sampling device of the present invention is mainly composed of the first to seventh resistors (voltage dividing resistors and bias resistors) R1 to R7, two transistors and a follower. The input voltage of the input terminal DC_T is the DC pulse voltage outputted from the DC bus voltages DCP and DCN through the transformer T through the proportional reduction and isolation. 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 input voltage of the input terminal DC_T is not limited to the DC bus voltage DCP, DCN through the transformer T to scale down the isolated DC pulse voltage, and other isolation measurement methods such as optocouplers can also be used to measure the DC bus voltage DCP, DCN. The output DC pulse voltage is used as t...

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Abstract

A bus voltage sampling device is provided, which can control the charging and discharging time to realize fast charging and slow discharging, thereby realizing fast response. The device is mainly composed of the first to seventh resistors (divider resistor and bias resistor), two triodes and a follower. The voltage input at the input terminal is a pulse voltage transformed from the DC bus voltage through the transformer T. The voltage at the output terminal of the bus voltage sampling device can be output from the final output terminal via the follower F.

Description

Technical field [0001] A bus voltage sampling device is provided. Background technique [0002] In order to protect the inverter connected to the power grid, it is necessary to sample the bus voltage of the power grid and control the inverter according to the sampling results. When the input voltage of the power grid fluctuates or the braking time of the motor is too short, the DC bus voltage input to the inverter will produce voltage spikes or undervoltages. These conditions 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 the inverter, compared with the bus undervoltage, the overvoltage is more harmful. Therefore, when an overvoltage occurs, the response time must be rapid, and the operation of the inverter can be stopped by inputting the output voltage (sampling voltage) of the sampling device to the control device (such as CPU). [0003] At present...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07
Inventor 成爱军
Owner LS INDAL SYST WUXI
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