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Power supply unit and its n-wire missing protection circuit

A technology for protecting circuits and power supply devices, which is applied in the direction of emergency protection circuit devices, output power conversion devices, electrical components, etc., and can solve problems such as single-phase sub-modules not working normally, blowing up, etc., to achieve protection and avoid commutation The effect produced

Active Publication Date: 2017-08-25
XJ ELECTRIC +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the three-phase parallel structure, three-phase four-wire input is required. If there is a lack of N wire (neutral wire disconnection and other faults), the parallel modules in the machine will form a circulation between each other, causing the single-phase sub-modules to fail to work normally. If the protection is not timely, there may even be bad situations such as bombing

Method used

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  • Power supply unit and its n-wire missing protection circuit
  • Power supply unit and its n-wire missing protection circuit
  • Power supply unit and its n-wire missing protection circuit

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] Example of a power supply unit

[0027] Such as image 3 The circuit schematic diagram of the whole power supply device is shown. The power supply device has three-phase four-wire input and is composed of three sub-modules (CONVERTER1, CONVERTER2, CONVERTER3) respectively connected to the three phases of A, B and C. The three sub-modules The output terminals of the DC bus are connected in parallel (V+, V-). The power supply device also includes an MCU main control unit and related peripheral circuits.

[0028] The sub-module is a switching power supply module. In this embodiment, the sub-module is composed of a PFC part and an LLC part, but it is not limited to this structure, and other structural forms can also be used. Since the structure of the switching power supply belongs to the prior art , which will not be introduced too much in this applica...

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PUM

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Abstract

The invention relates to a power supply device and an N-line-lacking protection circuit. The N-line-lacking protection circuit is based on a direct-current bus voltage detection circuit, when it is detected that a direct-current bus voltage rises and exceeds a certain limiting value, a signal is sent out to three sub-modules simultaneously, the three sub-modules are shut off, and accordingly commutation caused by N-line-lacking faults is avoided. For the whole power supply device, each sub-module is provided with an N-line-lacking protection circuit, when the N-line-lacking faults occur, the protection circuit of each sub-module can transmit the signal to the corresponding sub-module and other sub-modules, and accordingly the whole power supply device is protected.

Description

technical field [0001] The invention relates to a three-phase four-wire input power supply device composed of parallel single-phase input power supply modules and a neutral wire-missing protection circuit thereof. Background technique [0002] Parallel machine refers to: single-phase input power modules are connected in parallel inside the whole machine to form three-phase input power modules, and autonomous power distribution is performed. The N line refers to the neutral line. [0003] For parallel expansion in high-power machines, attention must be paid to the three-phase power balance problem, so generally single-phase modules are connected in parallel to form three-phase modules for operation. [0004] Such as figure 1 As shown, the three power supply sub-modules are connected in parallel on the same phase. When the input power is relatively large, the input current is relatively large, which causes the three-phase imbalance of the power grid and increases the cost of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/02H02H7/125H02M1/32
Inventor 陈志雄丁振伟王瑞冬魏众
Owner XJ ELECTRIC
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