Resonant converter and control circuit and control method thereof
A technology for resonant converters and control circuits, applied in transformer/inductor cores, transformer/inductor coils/windings/connections, control/regulation systems, etc., can solve problems such as load current uncertainty and audio noise
Active Publication Date: 2020-02-04
CHENGDU MONOLITHIC POWER SYST
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[0003] However, in the existing technology, when judging whether to enter the intermittent mode based on the feedback signal Vfb representing the output voltage, the corresponding load current when entering the intermittent mode is usually uncertain due to changes in circuit parameters, and this uncertainty will further bring Audio noise and other issues
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[0018] 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.
[0019] 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 a resonant converter and a control circuit and a control method thereof. The resonant converter comprises a switching circuit and a resonant circuit, wherein the switching circuit is provided with an upper side switching tube coupled between an input voltage and a switching node and a lower side switching tube coupled between the switching node and a reference ground; the resonant circuit is provided with a resonant capacitor and a resonant inductor which are coupled to the switching node; the control circuit comprises a calculation module, a comparison module and a switch control module; the calculation module is used for obtaining an output current calculation value according to a voltage and a correction signal at two ends of the resonant capacitor at the turn-off moment of the upper side switching tube, wherein the correction signal is in direct proportion to a switching frequency; the comparison module is used for comparing the output current calculation value with an intermittent mode threshold value and generating an intermittent mode control signal according to a comparison result; and the switch control module is used for switching the resonant converter to work in an intermittent mode or a normal mode according to the intermittent mode control signal.
Description
technical field [0001] The present invention relates to electronic circuits, and in particular, to a resonant converter and its control circuit and control method. Background technique [0002] In a resonant converter, a switching circuit converts a DC voltage into a square wave voltage and supplies it to a resonant circuit. When the resonant converter is working under light load, in order to improve the efficiency and reduce the switching loss, it is necessary to change the working mode of the resonant converter, for example, to control the resonant converter to work in the burst (Burst) mode, that is, to control the switching circuit to be switched off within a certain period of time. Driven by a high-frequency pulse signal, it remains off in another adjacent period of time, and the two states cycle alternately. Therefore, the equivalent switching frequency is reduced and the light load efficiency is improved. [0003] However, in the existing technology, when judging wh...
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IPC IPC(8): H02M3/335H01F27/24H01F27/28
CPCH02M3/33523H01F27/24H01F27/28H02M3/01H02M3/33571Y02B70/10H02M1/0035H02M1/0025H02M1/44H02M1/08H02M1/0048
Inventor 金亦青王斯然林翰涛
Owner CHENGDU MONOLITHIC POWER SYST