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A kind of igbt drive and wave-by-wave current limiting circuit control method

A wave-by-wave current limiting and circuit control technology, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as main power tube damage and switching device damage, and achieve the effect of improving system stability

Active Publication Date: 2022-07-15
商宇(深圳)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The switching device of the inverter is easily damaged by the impact of instantaneous high current, so a protection circuit is needed to protect the switching device of the inverter
[0003] The above existing technical solutions have the following defects: the inverter on the UPS power supply has multiple IGBT transistors. causing damage

Method used

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  • A kind of igbt drive and wave-by-wave current limiting circuit control method
  • A kind of igbt drive and wave-by-wave current limiting circuit control method
  • A kind of igbt drive and wave-by-wave current limiting circuit control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Embodiment 1: An IGBT driving and wave-by-wave current limiting circuit control method, such as figure 1 and figure 2 shown, the specific steps are as follows:

[0056] S1. Connect the current transformer to the IGBT transistor, the current transformer detects the current value of the transformer when the IGBT transistor is turned on, and transmits the collected current value to the wave-by-wave current limiting circuit.

[0057] S2, combined image 3 , the wave-by-wave current limiting circuit will amplify the current value obtained by the amplifying circuit to a small amplitude ratio and then output it. The wave-by-wave current-limiting circuit rectifies the current value with a small amplitude ratio and rectifies it through a diode half-bridge to form a steamed bun wave. The wave-by-wave current limiting circuit inputs the steamed bread wave into the comparison circuit. When the peak value of the steamed bread wave exceeds the reference voltage of the inverse input...

Embodiment 2

[0062] Embodiment 2, an IGBT driving and wave-by-wave current limiting circuit control method, the difference between this embodiment and Embodiment 1 is that it further includes the following steps:

[0063] S6. The memory of the microprocessor receives the steamed bread wave generated by the wave-by-wave current limiting circuit in real time, and the memory stores the peak value of the steamed bread wave.

[0064] S7 , the microprocessor regularly calls the peak value of the steamed bun wave stored by the microprocessor, and the microprocessor selects the peak value of the steamed bun wave as the y-axis and the time as the x-axis to create a waveform diagram. The microprocessor sends the waveform back to the memory for storage, and at the same time deletes the peak value of the steamed bread wave stored in the memory corresponding to the waveform.

[0065] S8. After the microprocessor receives the self-checking instruction, it calls the waveform diagram stored in the memory,...

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Abstract

The invention discloses an IGBT driving and wave-by-wave current limiting circuit control method, which belongs to the field of UPS power supply with inductive load and rectification load. The collected current value is transmitted to the wave-by-wave current-limiting circuit; S2, the wave-by-wave current-limiting circuit compares the collected current value with the set current-limiting threshold, and when the current value exceeds the set current-limiting threshold, the wave-by-wave current limiting The circuit enables and generates the wave-by-wave current limit enable signal; S3, the wave-by-wave current limit enable signal is transmitted to the microprocessor through the level conversion circuit, and the microprocessor turns off the IGBT transistor; S4, the current of the transformer drops, the current value Below the set current limiting threshold, the IGBT transistor is turned on again; S5, repeating steps S2 to S4, until the current value of the transformer is lower than the set current limiting threshold when the IGBT transistor is turned on, the present invention has the ability to accurately limit each The effect of current peaks beyond the limits of the main power tube.

Description

technical field [0001] The invention relates to the technical field of UPS power supply with inductive load and rectification load, in particular to an IGBT driving and wave-by-wave current limiting circuit control method. Background technique [0002] At present, the UPS power supply is a system equipment that connects the battery (mostly lead-acid maintenance-free battery) with the host, and converts the DC power into the mains through the host inverter and other module circuits. The inverter is a device that converts DC power (battery, storage battery) into AC power (usually 220V, 50Hz sine wave). The switching devices of the inverter are easily damaged by the instantaneous high current impact, so a protection circuit is required to protect the switching devices of the inverter. [0003] The above-mentioned prior art solutions have the following defects: the inverter on the UPS power supply has a plurality of IGBT transistors, and when the current passed by the IGBT tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/122
CPCH02H7/122H02H7/1227
Inventor 赖吉民李毅黄新发
Owner 商宇(深圳)科技有限公司
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