Control circuit, power supply device and electronic equipment
A technology for controlling circuit and voltage, applied in the field of control, can solve problems such as the increase of switching tube current, burning chips, crossover, etc., and achieve the effect of preventing false conduction
Pending Publication Date: 2022-04-15
CHENGDU LIPPXIN MICROELECTRONIC CO LTD
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Problems solved by technology
[0002] In the synchronous rectification chip, ringing will occur on both sides after the secondary switching tube is turned off. The magnitude of the voltage ringing is related to the inductance, parasitic inductance and capacitance, output voltage and load size. When the ringing touches the switching tube opening threshold, it will cause synchronization. The rectifier switch tube is mistakenly turned on, resulting in a crossover phenomenon (the primary side and the secondary side switch tube are turned on at the same time, causing the current of the switch tube to increase rapidly), the light one will cause additional chip loss, and the severe one will burn the chip
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[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.
[0038] It should be noted that like numerals and let...
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The embodiment of the invention provides a control circuit, a power supply device and electronic equipment, and the control circuit comprises a detection module which is used for detecting the relation between the voltage ringing area of a target switching element and a threshold value, and outputting an enable signal; and the logic module responds to the enable signal and controls the target switching element to switch the working state. Through cooperative work of the detection module and the logic module, it can be ensured that the secondary side of the transformer is conducted only when the primary side of the transformer is conducted; by detecting the relation between the voltage ringing area of the target switch element and the threshold value, the target switch element is controlled to switch the working state, and the target switch element can be prevented from being mistakenly conducted due to the ringing phenomenon.
Description
technical field [0001] The invention relates to the technical field of control, in particular to a control circuit, a power supply device and electronic equipment. Background technique [0002] In the synchronous rectification chip, ringing will occur on both sides after the secondary switching tube is turned off. The magnitude of the voltage ringing is related to the inductance, parasitic inductance and capacitance, output voltage and load size. When the ringing touches the switching tube opening threshold, it will cause synchronization. The rectifier switch tube is mistakenly turned on, resulting in a crossover phenomenon (the primary side and the secondary side switch tube are turned on at the same time, causing the current of the switch tube to increase rapidly). Contents of the invention [0003] An object of the present invention is to provide a control circuit, a power supply device, and an electronic device capable of preventing a target switching element from turn...
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IPC IPC(8): H02M1/38H02M1/08H02M1/088H02M1/32
CPCH02M1/38H02M1/08H02M1/088H02M1/32Y02B70/10
Inventor 王梁沈飏
Owner CHENGDU LIPPXIN MICROELECTRONIC CO LTD