Control circuit of isolated power supply, isolated power supply and control method thereof
A control circuit and isolation technology, applied in electrical components, output power conversion devices, DC power input conversion to DC power output, etc., can solve the problems of loss feedback adjustment accuracy, transient response ability or efficiency, etc., to eliminate Possibility of punch-through, effect of preventing punch-through
Active Publication Date: 2021-07-23
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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[0007] In order to solve the problem in the prior art that when the main switch tube and the synchronous rectifier tube are in common, the feedback adjustment accuracy, transient response capability or efficiency will be lost, the present invention proposes a control circuit for an isolated power supply, an isolated power supply and its control method
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[0063] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.
[0064] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...
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A control circuit is used for controlling the isolated power supply and comprises a secondary side control signal generator and a primary side control signal generator. The secondary side control signal generator generates a secondary side switch tube control signal including information of the turn-off moment of the secondary side synchronous rectifier tube, and the turn-off moment is used as a second turn-on moment. And the primary side control signal generator obtains the turn-on moment of the primary side main switch tube as the first turn-on moment based on the feedback signal. And the primary side turn-on signal generator further determines the turn-on moment of the primary side switching tube based on the later moment of the second turn-on moment and the first turn-on moment so as to generate the primary side switching tube control signal. The control circuit can effectively prevent the punch-through of the primary side switching tube and the secondary side switching tube, and does not cause excessive influence on the precision of feedback regulation.
Description
technical field [0001] The invention relates to an electronic circuit, in particular to a control circuit of an isolated power supply, an isolated power supply and a control method thereof. Background technique [0002] Under the background of the increasing importance of environmental protection and energy saving, the requirements for power supply efficiency are getting higher and higher. As for switching power supplies, it is an effective way to improve efficiency by using synchronous rectification switching tubes to replace traditional freewheeling diodes. When the power supply is in the inductor current continuous mode (CCM), in the process of controlling the synchronous rectifier, if the synchronous rectifier switch and the main switch are turned on at the same time, it may cause a serious risk of explosion due to commonality, so it is necessary to Special attention is paid to the control circuit design process. For non-isolated switching power supplies, the control o...
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IPC IPC(8): H02M1/38H02M5/293H02M7/217
CPCH02M1/38H02M5/293H02M7/217H02M3/33507H02M3/33592H02M1/348H02M1/0048
Inventor 郭艳梅朱臻陈一辉李岳辉郜小茹缪海峰杨瀚飞
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD