Primary side control circuit of switching power supply and switching power supply
A technology of primary side control circuit and switching power supply, applied in control/regulation systems, electrical components, regulating electrical variables, etc., can solve the problems of large VDS stress of secondary side MOSFET, and achieve the effect of reducing VDS stress and increasing decay time
Active Publication Date: 2021-04-23
茂睿芯(深圳)科技有限公司
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Problems solved by technology
[0006] The purpose of this application is to provide a primary side control circuit of a switching power supply and a switching power supply, aiming at solving the problem that the primary side of the traditional switching power supply control circuit is applied to the switching power supply due to the existence of the primary and secondary side through currents, which causes the secondary side MOSFET The problem of generating large VDS stresses on
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[0065] In order to make the technical problems, technical solutions and beneficial effects to be solved by 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.
[0066] It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0067] It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and oth...
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The invention relates to a primary side control circuit of a switching power supply and a switching power supply, when an internal voltage is accessed through a soft start control circuit, the internal voltage is converted into an analog control signal, wherein the internal voltage is a sampling voltage or a soft start voltage of an auxiliary winding detection voltage of the switching power supply; an oscillator outputs an internal clock of which the frequency is in linear relation with the analog control signal; a PWM control circuit outputs a PWM control signal according to the primary side current sampling signal and the internal clock; a driving circuit amplifies the PWM control signal to output a conversion control signal; when the output direct current is small (when the switching power supply is started), the frequency of the conversion control signal is reduced, the attenuation time of the secondary side current is prolonged, the secondary side current is attenuated to zero when the next PWM period arrives, the switching power supply is prevented from working in a CCM mode, and the VDS stress of the secondary side field effect transistor is reduced.
Description
technical field [0001] The application belongs to the field of power supply technology, and in particular relates to a primary side control circuit of a switching power supply and a switching power supply. Background technique [0002] Such as figure 1 As shown, the primary side control circuit of the traditional switching power supply includes an oscillator, a pulse width modulation (Pulse WidthModulation, PWM) control circuit and a drive circuit, the oscillator outputs an internal clock with a preset frequency; the PWM control circuit samples the signal according to the primary side current and the internal clock output PWM control signal; the driving circuit amplifies the PWM control signal to output the conversion control signal. [0003] When the traditional control circuit of the primary side of the switching power supply is applied to the switching power supply, when the switching power supply is started, the output direct current VOUT is slowly established through t...
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IPC IPC(8): H02M1/08H02M3/335
CPCH02M1/08H02M3/33576
Inventor 胡志成高克宁东伟韩周
Owner 茂睿芯(深圳)科技有限公司