Soft start circuit, switching power supply circuit, switching power supply equipment and electronic equipment
A technology of switching power supply circuit and soft start circuit, which is applied in the direction of electrical components, adjusting electric variables, instruments, etc., and can solve problems such as excessive voltage rise, excessive voltage rise, and large primary and secondary side stress of the circuit system.
Active Publication Date: 2022-01-11
SHENZHEN ICM MICROELECTRONICS CO LTD
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Problems solved by technology
Of course, this part of the difference may be relatively large depending on the layout and layout of the layout, which leads to the circuit performance of the soft-start circuit design, which has a serious dependence on the layout design. Due to the influence of the layout design capacitance, it will make V soft voltage rises too fast, which causes V cs The voltage rises too fast, which brings greater primary and secondary side stress to the circuit system
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[0024] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0025] Such as figure 1 As shown, the embodiment of the present application provides a soft start circuit 105, the soft start circuit 105 is used in a switching power supply circuit, the switching power supply circuit includes a transformer 102, a comparator 104 and a driving power stage circuit 103, the comparator 104 ( Such as the output end of SSCMP comparator) is connected with the input end of drive power stage circuit 103, the first input end (-end) of comparator 104 is connected with the output end (V of drive power stage circuit 103 cs voltage) connected. In an e...
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The invention relates to a switching power supply technology, and provides a soft start circuit, a switching power supply circuit, switching power supply equipment and electronic equipment. The primary and secondary side pressure of a system is reduced, and the soft start circuit part comprises a narrow pulse width clock module, a first power switch tube, a first current source, a first capacitor unit and a second capacitor unit. The control end of the first power switch tube is connected to the output end of the narrow pulse width clock module, the first end of the first power switch tube is connected to one end of the first capacitor unit and used for being connected to the second input end of the comparator, and the other end of the first capacitor unit is connected to the ground end. The second end of the first power switch tube is connected to one end of the first current source and one end of the second capacitor unit, the other end of the first current source is used for being connected to a power supply end, and the other end of the second capacitor unit is connected to the ground end.
Description
technical field [0001] The present application relates to the technical field of switching power supplies, and in particular to a soft start circuit, a switching power supply circuit, switching power supply equipment and electronic equipment. Background technique [0002] If the power adapter does not control the feedback voltage (CS voltage) at the output terminal during the system startup process, the system will try to work with the maximum peak current due to the effect of the loop, which will bring greater stress on the primary and secondary sides. To solve this problem, a soft-start circuit is required. [0003] Such as figure 1 , the schematic diagram of a power adapter with a soft-start circuit, including an AC rectifier 101, a transformer 102, a drive power stage circuit 103, a soft-start comparator SS_CMP104 and a soft-start circuit 105. In the soft start phase, when the rising edge of LPCLK arrives, the power stage circuit 103 is driven to turn on the power swit...
Claims
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IPC IPC(8): H02M1/36H02M3/335H02M1/088
CPCH02M1/36H02M3/33569H02M1/088Y02B70/10
Inventor 郭帅王蒙白青刚杨小华侯永军
Owner SHENZHEN ICM MICROELECTRONICS CO LTD