Isolated switch converter, control circuit and control method thereof
A technology of switching converters and control circuits, applied in control/regulation systems, emergency protection circuit devices, DC power input conversion to DC power output, etc., can solve problems such as overvoltage damage and false triggering of overvoltage protection, and achieve improved reliability effect
Active Publication Date: 2019-03-08
西安矽力杰半导体技术有限公司
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Problems solved by technology
However, if the overvoltage protection threshold is set low, it may cause false triggering of the overvoltage protection when the voltage demand of the load device is high.
When the overvoltage protection threshold is set higher, the overvoltage protection can only be triggered when the output voltage increases to a large level, and there may be a risk of overvoltage damage when the voltage demand of the load device is low
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[0050] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.
[0051] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
[0052] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another eleme...
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The invention discloses an isolated switch converter, a control circuit and a control method thereof. The current peak value of a power level primary side of the isolated switch converter is maintained to be smaller than a current threshold value when an output voltage set signal changes, and when the current peak value of the power level primary side is detected to reach an overvoltage protectionthreshold value, matched with the output voltage set signal, set in the current threshold value period in response to an output voltage feedback signal exceeding the overvoltage protection thresholdvalue to start overvoltage protection, so that the overvoltage protection threshold value changes self-adaptively along with output voltage, overvoltage protection is not carried out when the voltageset signal changes, and overvoltage protection is started when a secondary side controller breaks down, so that the reliability of the isolated switch converter is improved.
Description
technical field [0001] The present invention relates to the technical field of power electronics, and more specifically, to an isolated switching converter, a control circuit and a control method thereof. Background technique [0002] Isolated switching converters are widely used in various off-line power supply systems. Isolated switching converters usually include primary side circuits and secondary side circuits. By controlling the on-off of the power switch in the primary side circuit, the secondary The side circuit outputs a constant voltage or a constant current. [0003] In order to prevent the circuit from being damaged by the overvoltage of the output voltage, it is necessary to activate the overvoltage protection when the overvoltage occurs. In the prior art, an isolated switching converter usually sets a fixed overvoltage protection threshold to enable the overvoltage protection when the output voltage is greater than the overvoltage protection threshold. Howeve...
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IPC IPC(8): H02M3/335
CPCH02M3/33523G05F1/46H02M1/32H02M1/0025H02M3/33507H02M3/33592H02H7/1213G05F1/571H02H3/20
Inventor 杨笑宇白永江黄秋凯
Owner 西安矽力杰半导体技术有限公司