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Anti-reverse-connection protection circuit and method for improving safety and direct-current power grid system

A protection circuit and anti-reverse connection technology, which is applied in the field of electronic power, can solve problems such as burnout of converter components, and achieve the effect of improving safety

Active Publication Date: 2019-11-08
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides an anti-reverse connection protection circuit, method and DC power grid system to improve safety, so as to solve the problem that the internal components of the converter will burn out after the DC bus is reversed in the prior art

Method used

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  • Anti-reverse-connection protection circuit and method for improving safety and direct-current power grid system
  • Anti-reverse-connection protection circuit and method for improving safety and direct-current power grid system

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Experimental program
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Embodiment 1

[0052] This embodiment provides an anti-reverse connection protection circuit that improves safety.

[0053] figure 1 It is a structural diagram of an anti-reverse connection protection circuit according to an embodiment of the present invention, such as figure 1 As shown, the circuit includes:

[0054] 1. Connect the DC bus capacitor C1 and the DC bus output side respectively to detect the voltage value of the DC bus capacitor C1 and the voltage value of the DC bus output side;

[0055] A control unit 2, the input terminal is connected to the sampling unit 1, and the output terminal is connected to a switching device, for controlling the switching device to be turned on or off according to the voltage value of the DC bus capacitor C1 and the voltage value of the DC bus output side;

[0056] The switching device 3 is arranged between the converter 4 and the positive pole of the output side of the DC bus, and is used to control the circuit between the converter 4 and the output...

Embodiment 2

[0075] This embodiment provides a DC power grid system, including the above-mentioned anti-reverse connection protection circuit, which is used to control the circuit on the output side of the DC bus to disconnect in time when the DC bus is reversed, so as to improve the overall safety of the system.

Embodiment 3

[0077] This embodiment provides an anti-reverse connection protection method that improves safety.

[0078] Figure 5 It is a flowchart of an anti-reverse connection protection method according to an embodiment of the present invention, such as figure 1 As shown, the method includes:

[0079] S101, detecting the voltage value of the DC bus capacitor and the voltage value of the output side of the DC bus;

[0080] In this embodiment, specific implementation methods for detecting the voltage value of the DC bus capacitor and the voltage value at the output side of the DC bus include:

[0081] The DC bus capacitor voltage value and the DC bus output side voltage value are respectively detected through the sampling unit;

[0082] Wherein, the sampling unit is respectively connected to the DC bus capacitor and the output side of the DC bus.

[0083] Specifically, the sampling unit includes a first subunit connected in parallel to both ends of the DC bus capacitor and a second s...

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Abstract

The invention discloses an anti-reverse-connection protection circuit and method for improving safety and a direct-current power grid system. The circuit comprises: a sampling unit which is respectively connected with a DC bus capacitor and a DC bus output side and used for detecting a DC bus capacitor voltage value and a DC bus output side voltage value; a control unit with an input end connectedwith the sampling unit and an output end connected with a switching device, and the control unit is used for controlling the switching device to be switched on or off according to the DC bus capacitor voltage value and the DC bus output side voltage value; and the switching device arranged between a converter and the positive electrode of the DC-bus output side and used for controlling a circuitbetween the converter and the DC-bus output side to be connected or disconnected. According to the method and structure, when the DC-bus is reversely connected, the circuit at the DC-bus output side can be controlled to be disconnected in time, the reverse current is prevented from flowing back to the DC-DC converter to damage internal elements, and the overall safety of the system is improved.

Description

technical field [0001] The invention relates to the technical field of electronic power, in particular, to an anti-reverse connection protection circuit, method and DC power grid system for improving safety. Background technique [0002] As the blood of the world economy, energy is an important foundation for economic development and social progress. As an energy conversion device, the DC-DC converter plays an important role in DC conversion. DC-DC converters are widely used in the field of DC micro-grid. They can be used as photovoltaic DC for MPPT optimization; they can be used as energy storage DC for battery charging and discharging; they can be used as step-down DC for high-voltage DC bus step-down. It is a low-voltage DC bus. [0003] For the DC-DC converter connected to the DC bus, if the DC bus is powered and reversed, the components inside the DC-DC converter will be turned on, and the bus will be short-circuited, which will cause the components to burn out and af...

Claims

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Application Information

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IPC IPC(8): H02J1/10
CPCH02J1/108
Inventor 蒋世用张祥文武刘克勤陈宁宁
Owner GREE ELECTRIC APPLIANCES INC
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