Isolated voltage converting circuit and control method thereof
A technology of voltage conversion circuit and control method, which is applied to output power conversion devices, electrical components, conversion equipment with intermediate conversion to AC, etc., and can solve control signal errors, isolated voltage conversion circuits not working normally, secondary side The control chip cannot work normally and other problems to achieve the effect of ensuring stability
Active Publication Date: 2012-09-05
CHENGDU MONOLITHIC POWER SYST
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Problems solved by technology
In these cases, the secondary side control chip will not work properly due to insufficient power supply
Therefore, the control signal generated by the secondary side control chip may be wrong, which will cause the isolated voltage conversion circuit to work abnormally.
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[0020] 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.
[0021] 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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The invention discloses an isolated voltage converting circuit and a control method thereof. The isolated voltage converting circuit comprises a transformer, a primary power switch, a secondary power switch, a primary controller, a secondary controller and a coupling device, wherein the transformer comprises a primary winding, a secondary winding and a third winding; the primary winding is coupled with the primary power switch; the secondary winding is coupled with the secondary power switch; the coupling device is provided with an input side and an output side, the input side is coupled with the primary controller, and the output side generates a frequency control signal; the primary controller provides a gate pole signal to control the on-off of the primary power switch; and the primary controller comprises a peak value comparator, a logic circuit, a starting control circuit, a load detection circuit and a selector.
Description
technical field [0001] The present invention relates to electronic circuits, and more particularly, the present invention relates to an isolated voltage conversion circuit and a control method thereof. Background technique [0002] Some isolated voltage conversion circuits use a combination of a primary side control chip and a secondary side control chip to control the operation of the isolated voltage conversion circuit. In this type of isolated voltage conversion circuit, the coupling device couples the control signal generated by the secondary-side control chip to the primary-side control chip, so as to control the operation of the isolated voltage converter together with the control signal generated by the primary-side control chip. The secondary side control chip is usually powered by the output voltage of the isolated voltage conversion circuit. [0003] When the isolated voltage conversion circuit starts up, the output voltage has not yet established, and in the even...
Claims
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IPC IPC(8): H02M3/28
CPCH02M3/33523H02M1/36
Inventor 王斯然张军明任远程
Owner CHENGDU MONOLITHIC POWER SYST