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DC bus short-circuit detection method and device and detection circuit

A DC bus, short-circuit detection technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve problems such as destroying circuit components, and achieve the effect of improving circuit safety and reducing design margins

Active Publication Date: 2018-05-08
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a DC bus short circuit detection method, device and detection circuit to at least solve the problem in the prior art that circuit components may be damaged if there is a short circuit when the power circuit is powered on with strong power

Method used

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  • DC bus short-circuit detection method and device and detection circuit

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Embodiment 1

[0023] In the current power circuit, the bus bar is often short-circuited due to damage to power devices or foreign matter entering. At this time, it is generally judged whether there is a short circuit by collecting the current bus voltage value. When the power is turned on for the first time with a strong current, or when the power is turned on again, the bus bar is zero at this time, and it can only be judged whether the back end is short-circuited at this time through the strong current pre-charging circuit. However, there is a disadvantage in this design. When the strong voltage is in a wide range, various restrictions will be imposed on the pre-charging circuit due to short-circuit reasons, which will reduce the performance of the circuit; If the surge current at the end is too large, it will cause secondary damage to the back-end circuit or even cause a fire. At the same time, it will also make the pre-charging circuit seriously heated and reduce its service life.

[00...

Embodiment 2

[0033] Based on the DC bus short-circuit detection circuit provided in the above-mentioned embodiment 1, an optional embodiment 2 of the present invention also provides a DC bus short-circuit detection method, figure 2 An alternative flowchart showing the method, such as image 3 As shown, the method may include the following steps S302-S304:

[0034] S302, before the strong current pre-charging circuit is started, the bus voltage value is detected by the strong current voltage detection circuit;

[0035] S304, judging whether to start the strong current pre-charging circuit normally according to the detected bus voltage value, so as to detect and judge whether the bus is short-circuited.

[0036] In the above embodiment, when detecting whether the bus bar of the power circuit is short-circuited, the voltage value of the bus bar is detected before the start-up of the high-current pre-charging circuit, and it is judged according to the detected bus-bar voltage value whether t...

Embodiment 3

[0041] Based on the DC bus short-circuit detection method provided in the above-mentioned embodiment 2, an optional embodiment 3 of the present invention also provides a DC bus short-circuit detection device, specifically, Figure 4 shows an optional structural block diagram of the device, such as Figure 4 As shown, the device includes: a detection unit 42, which is used to detect the bus voltage value through the strong current voltage detection circuit before the strong current pre-charging circuit is started; a judgment unit 44, which is connected to the detection unit 42, is used to value to judge whether to start the strong current pre-charging circuit normally, so as to detect and judge whether the bus is short-circuited or not.

[0042] In one embodiment, the judging unit includes: a comparison module, configured to compare the detected bus voltage value with a first preset threshold; a first judging module, configured to detect when the bus voltage value is greater th...

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Abstract

The invention discloses a DC bus short-circuit detection method and device and a detection circuit. The method comprises the steps of detecting a bus voltage value through a strong-current voltage detection circuit before a strong-current pre-charge circuit is started; and judging, according to the detected bus voltage value, whether the strong-current pre-charge circuit is normally started, so asto detect and judge whether the bus is short-circuited. According to the invention, the problem that in the prior art, if a short-circuit condition occurs during power-up of the strong-current circuit, circuit components may be destroyed is solved, and the circuit safety is improved.

Description

technical field [0001] The invention relates to the technical field of circuit detection, in particular to a DC bus short circuit detection method, device and detection circuit. Background technique [0002] In the current power circuit, the bus bar is often short-circuited due to damage to power devices or foreign matter entering. At this time, it is generally judged whether there is a short circuit by collecting the current bus voltage value. When the power is turned on for the first time with a strong current, or when the power is turned on again, the bus bar is zero at this time, and it can only be judged whether the back end is short-circuited at this time through the strong current pre-charging circuit. However, there is a disadvantage in this design. When the strong voltage is in a wide range, various restrictions will be imposed on the pre-charging circuit due to short-circuit reasons, which will reduce the performance of the circuit; If the surge current at the end...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 杨坚戴彪宋爱程海松朱晓蒙
Owner GREE ELECTRIC APPLIANCES INC
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