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an auxiliary power supply

An auxiliary power supply and potential technology, which is used in electrical components, output power conversion devices, and AC power input to DC power output. The effect of system cost

Active Publication Date: 2021-04-20
爱士惟科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the auxiliary power supply of the photovoltaic inverter usually takes power from the entire BUS, which requires a high withstand voltage level of the power tube of the auxiliary power supply, resulting in higher costs
And for other power supply devices with high input voltage, there are similar problems

Method used

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0033] The existing photovoltaic inverter auxiliary power supply has the following defects: (1) The photovoltaic inverter auxiliary power supply is usually powered from the full BUS, which requires a high withstand voltage level of the auxiliary power supply power tube, resulting in high cost. (2) The photovoltaic inverter with BUS midpoint has the problem of unbalanced positive and negative half BUS voltages, which will lead to poor reliability of power devices and BUS capacitors and increase output current harmonics in severe cases.

[0034] In order to improve the deficienc...

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Abstract

The invention discloses an auxiliary power supply, comprising: a DC bus bar containing a potential midpoint, a flyback circuit and two diodes, and the flyback circuit includes two single-tube flyback circuits; wherein: the input voltage of one single-tube flyback circuit The input voltage of the other single-tube flyback circuit is the negative half BUS; the cathode of each diode is connected to the input terminal of a single-tube flyback circuit, and the anode of one diode is connected to the positive pole of the DC bus, and the other The anode of the diode is connected to the midpoint of the potential of the DC bus; the two diodes are turned on according to the voltage difference between the positive half BUS and the negative half BUS, and when one of the diodes is turned on, a single transistor connected to the turned-on diode The excitation circuit works and outputs the power supply voltage. The auxiliary power supply disclosed by the invention can reduce the requirement for the withstand voltage level of the power tube of the auxiliary power supply, thereby reducing the system cost.

Description

technical field [0001] The invention relates to the field of energy, in particular to an auxiliary power supply. Background technique [0002] The open circuit voltage of solar cell modules is generally as high as 1000V or even 1500V, that is to say, the maximum voltage of the busbar (BUS) of the photovoltaic inverter is as high as 1000V or even 1500V. At present, the auxiliary power supply of the photovoltaic inverter usually takes power from the entire BUS, which requires a high withstand voltage level of the power tube of the auxiliary power supply, resulting in higher costs. And for other power supply devices with high input voltage, similar problems exist. Contents of the invention [0003] In order to solve the above-mentioned technical problems, the present invention provides an auxiliary power supply, which can reduce the requirements for the withstand voltage level of the power tube of the auxiliary power supply, thereby reducing the system cost. [0004] In ord...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M1/44
CPCH02M1/44H02M7/53871
Inventor 廖细文
Owner 爱士惟科技股份有限公司
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