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Charging circuit for improving reliability and charging control method thereof, and photovoltaic air conditioning device

A charging circuit and charging resistor technology, which is applied to battery circuit devices, circuit devices, collectors, etc., can solve problems such as low reliability and charging circuit dependence, and achieve the effect of improving reliability and withstand voltage value

Pending Publication Date: 2019-11-01
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a charging circuit, a control method, and a photovoltaic air-conditioning device for improving reliability, so as to solve the problem in the prior art that the charging circuit relies on IGBT modules and has low reliability

Method used

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  • Charging circuit for improving reliability and charging control method thereof, and photovoltaic air conditioning device
  • Charging circuit for improving reliability and charging control method thereof, and photovoltaic air conditioning device
  • Charging circuit for improving reliability and charging control method thereof, and photovoltaic air conditioning device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] figure 1 It is a structural diagram of a charging circuit according to an embodiment of the present invention, such as figure 1 As shown, the charging circuit includes:

[0044] A plurality of switches 1, connected to the AC filter board 5, are used to control the conduction or cut-off of the charging circuit;

[0045] A plurality of charging resistors 2 are connected in series with the plurality of switches 1 in one-to-one correspondence to form a plurality of charging branches, and the plurality of charging branches are connected in parallel between the AC filter board 5 and the rectifier module for limiting the magnitude of the current in the charging circuit;

[0046] Specifically, firstly, the plurality of charging resistors 2 and the plurality of switches 1 are connected in series in one-to-one correspondence, and each set of series-connected charging resistors 2 and switches 1 is a charging path, and then the plurality of charging branches Connected in paralle...

Embodiment 2

[0071] This embodiment provides a photovoltaic air conditioner, including the charging circuit of the above embodiment, by directly connecting the charging circuit to the two ends of the DC bus to charge the DC bus capacitor in the photovoltaic air conditioner, so as to improve the reliability of the photovoltaic air conditioner during the charging process. sex.

Embodiment 3

[0073] image 3 It is a flowchart of a charging control method according to an embodiment of the present invention, such as image 3 As shown, the method includes:

[0074] S101, detecting the voltage value at both ends of the DC bus capacitor;

[0075] In this embodiment, the voltage value at both ends of the DC bus capacitor can be detected by connecting a voltage detection device in parallel at both ends of the DC bus, and the detection device can be a voltmeter, or other devices capable of obtaining the voltage at both ends of the DC bus capacitor , the present invention is not specifically limited.

[0076] S102. If the voltage across the DC bus capacitor is lower than a first threshold, start a charging mode of the charging circuit.

[0077] By setting the first threshold, charging can be performed in time when the voltage across the DC bus capacitor is too low, and the charging mode can be automatically turned on.

[0078] In specific implementation, the charging mo...

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PUM

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Abstract

The invention discloses a charging circuit for improving reliability and a charging control method thereof, and a photovoltaic air conditioning device. The charging circuit comprises: a plurality of switches connected to an AC filter board and used for controlling conduction or cut-off of the charging circuit; and a plurality of charging resistors being in one-to-one correspondence connection withthe plurality of switches in series to form a plurality of charging branches which are connected in parallel between the AC filter board and a rectifier module to limit the current in the charging circuit; and the rectifier module connected between a DC bus and the charging resistors to limit the current direction of the charging circuit. According to the invention, the charging circuit is directly connected to the both ends of the DC bus, and the reliability can be improved without depending on the IGBT module.

Description

technical field [0001] The invention relates to the technical field of energy storage devices, in particular to a charging circuit for improving reliability, a control method, and photovoltaic air-conditioning equipment. Background technique [0002] The solution adopted for the charging circuit of the existing photovoltaic air conditioner is: a normally closed relay is connected in series with the charging resistor, and the charging circuit is connected across the two ends of the main circuit charging relay. After the unit is powered on, the charging circuit charges the DC bus through the anti-parallel diode inside the IGBT module. After the charging is completed and the detection system has no faults, the main circuit relay is closed, and the charging relay is disconnected. The charging process is completed. However, the charging process in this scheme The circuit depends on the IGBT module. Once the diode inside the module IGBT module is short-circuited, it will affect th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/02H02J7/00
Inventor 刘帅蒋世用文武刘克勤王京
Owner GREE ELECTRIC APPLIANCES INC