Multipath output switch power supply and inverter

A switching power supply, multi-output technology, which is applied in the direction of adjusting electrical variables, output power conversion devices, converting DC power input to DC power output, etc. To avoid poor cross-adjustment rate

Inactive Publication Date: 2016-09-28
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

However, due to the existence of factors such as transformer T1 leakage inductance, leakage inductance coil resistance and diode voltage drop in the multi-output switching power supply, the auxiliary output voltage V out2 It will become very large with the increase of the duty ratio of the main switching tube on the primary side of the transformer T1 (this phenomenon is usually called the poor cross-regulation rate of the multi-output switching power supply). If the auxiliary output load F2 is switched at this time, It will inevitably cause the voltage across the auxiliary output load F2 to be too high and be damaged

Method used

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  • Multipath output switch power supply and inverter

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Embodiment Construction

[0018] 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.

[0019] see figure 1 , The embodiment of the present invention discloses a multi-output switching power supply to overcome the problem of overvoltage damage to the auxiliary output load caused by the difference in cross regulation of the multi-output switching power supply. Compared with the multi-output switching power supply disclosed in the prior art, the multi-output switching power supply disclosed in the embodiment of the present invention has the followi...

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Abstract

The invention discloses a multipath output switch power supply and an inverter. An auxiliary voltage output terminal of the multipath output switch power supply is connected to a protection circuit in series; the protection circuit comprises a switch device and a resistor; the switch device and the resistor are connected in series; and the multipath output switch power supply also comprises a control circuit which is used for controlling the switch device to switch off before an auxiliary output load of the multipath switch power supply accesses the circuit. The multipath output switch power supply and the inverter overcome the problem of overvoltage damage of the auxiliary output load which is brought by a poor cross regulation rate of the multipath output switch power supply.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more specifically, to a multi-output switching power supply and an inverter. Background technique [0002] The output voltage of the multi-output switching power supply is determined by the main output voltage V out1 and auxiliary output voltage V out2 composition. Multi-output switching power supply is generally only for the main output voltage V out1 Closed-loop voltage regulation is adopted, and its overall structure is as follows figure 1 shown. [0003] When the main output load F1 increases, the main switching tube control circuit in the main output loop maintains the main output voltage V by increasing the duty cycle of the main switching tube on the primary side of the transformer T1 out1 unchanged to avoid the main output voltage V out1 With the increase of the main output load F1, it drops below the minimum operating voltage of the main output load F1. However, due ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33523H02M3/33561H02M1/0012H02M1/009
Inventor 邢军徐清清张涛耿后来黄志锋肖靖
Owner SUNGROW POWER SUPPLY CO LTD
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