Switching power supply circuit, secondary side control circuit and method for switching power supply circuit
A switching power supply circuit, control circuit technology, applied in control/regulation systems, high-efficiency power electronic conversion, electrical components, etc., can solve problems such as limited battery capacity
Active Publication Date: 2021-07-06
ZHEJIANG UNIV
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- Description
- Claims
- Application Information
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Problems solved by technology
However, limited by the size of the electronic device itself, the battery capacity is limited, and the corresponding fast charging technology has emerged as the times require, and realizes fast charging of the battery to compensate for the inconvenience of insufficient battery capacity.
Fast charging technology requires a higher power adapter power supply. How to enable the adapter power supply to output greater power in the same volume, that is, higher power density, has become a major challenge at present.
Method used
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[0028] 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.
[0029] 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 application discloses a switching power supply circuit, a secondary side control circuit and a method for the switching power supply circuit. The switching power supply circuit includes: a primary side power switch, a secondary side switching circuit and a secondary side control circuit, wherein the secondary side control circuit controls the secondary side switching circuit: after the primary side power switch is disconnected, freewheeling is performed; After the flow ends, the primary side power switch is turned on again for a period of time before being turned on in the next switching cycle. The switching power supply circuit of the present invention conducts the secondary side switch circuit twice in one switching cycle, so that before the primary side power switch is turned on, its body diode is turned on, realizing the zero voltage (ZVS) of the primary side power switch open, reducing losses.
Description
technical field [0001] The present invention relates to an electronic circuit, more specifically, the present invention relates to a switching power supply circuit, a secondary side control circuit for the switching power supply circuit and a method thereof. Background technique [0002] With the rapid development of information technology, various electronic devices are increasingly used, such as mobile phones and portable computers. These devices can be powered by an external adapter power supply (or charger). The adapter power supply is usually an AC-to-DC conversion, that is, the mains power of the grid, such as domestic 50Hz / 220V AC power, is converted into a low-voltage DC power (such as 5V DC output), and electrical isolation is achieved. A typical circuit topology of this circuit is a flyback converter. In order to maintain the stability of the output voltage, the traditional adapter power supply needs to sample and feedback the output voltage on the output side. ...
Claims
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IPC IPC(8): H02M3/335H02M1/08
CPCH02M3/33576H02M1/083H02M1/0038H02M1/0009H02M1/0058Y02B70/10H02M3/33523H02M3/33592
Inventor 张军明张桢
Owner ZHEJIANG UNIV