Method and device for detecting switch state of bypass relay in step-up chopper circuit

A technology of step-up chopping and switch state, applied in the field of power electronics, can solve problems such as increased inductor current and damage to power devices, and achieve the effect of reducing the probability of being damaged

Active Publication Date: 2018-08-03
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If the boost chopper circuit starts to work, but the bypass relay is still closed, it will cause the inductor current to increase rapidly, causing damage to the power device

Method used

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  • Method and device for detecting switch state of bypass relay in step-up chopper circuit
  • Method and device for detecting switch state of bypass relay in step-up chopper circuit
  • Method and device for detecting switch state of bypass relay in step-up chopper circuit

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Embodiment Construction

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0043] The invention discloses a switch state detection method of a bypass relay in a step-up chopper circuit. Based on the method, the switch state of the bypass relay can be accurately detected, thereby reducing the probability of damage to power devices in the step-up chopper circuit.

[0044] see figure 2 , figure 2 It is a flow chart of a method for detecting the switch state of a bypass relay in a step-up chopper circuit disclosed by the present inven...

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PUM

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Abstract

The invention discloses a switch state detection method of a bypass relay in a step-up chopper circuit, comprising: sending a disconnection command to the bypass relay, the disconnection command being used to control the bypass relay to perform a disconnection operation; The power tube in the circuit sends a PWM signal and detects the voltage value of the bus in the step-up chopper circuit. The PWM signal can ensure that the current flowing through the power tube is in a safe range; determine the voltage rise of the bus, if the voltage rise reaches the first If a threshold is reached, it is determined that the bypass relay is in an open state, and if the voltage rise value does not reach the first threshold, it is determined that the bypass relay is in a closed state. The switch state detection method disclosed by the invention can accurately determine the switch state of the bypass relay, thereby reducing the probability of damage to power devices in the step-up chopper circuit. The invention also discloses a switch state detection device of the bypass relay in the step-up chopper circuit.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a method and a device for detecting a switch state of a bypass relay in a step-up chopper circuit. Background technique [0002] Boost chopper circuit (boost circuit) is a relatively common DC boost circuit. [0003] In order to reduce the forward channel impedance of the boost chopper circuit and improve the conversion efficiency of the boost chopper circuit, a bypass relay is often set in the boost chopper circuit. When the input voltage is low, the boost chopper circuit work, the control bypass relay is disconnected, when the input voltage is high, the step-up chopper circuit does not need to work, and the control bypass relay is closed. figure 1 shows a boost chopper circuit with a bypass relay including input capacitor C PV , Bus capacitance C bus , a power tube S, an inductor L, a diode D and a bypass relay KM1, wherein the bypass relay KM1 is conne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327
Inventor 张凤岗袁利华苏振东张志飞
Owner SUNGROW POWER SUPPLY CO LTD
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