Primary side control circuit of switching power supply and switching power supply
A primary-side control circuit and switching power supply technology, which is applied in control/regulation systems, electrical components, and regulation of electrical variables, etc., can solve problems such as large VDS stress of secondary MOSFETs, and achieve the effects of reducing VDS stress and increasing decay time
Active Publication Date: 2022-02-22
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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A primary side control circuit of a switching power supply and a switching power supply, when the internal voltage is connected to the soft start control circuit, the internal voltage is converted into an analog control signal; the internal voltage is the sampling voltage or soft start of the auxiliary winding detection voltage of the switching power supply voltage; the internal clock whose output frequency of the oscillator has a linear relationship with the analog control signal; the PWM control circuit outputs the PWM control signal according to the primary current sampling signal and the internal clock; the drive circuit amplifies the PWM control signal to output the conversion control signal; when the output When the DC power is small (when the switching power supply is started), the frequency of the switching control signal is reduced, and the decay time of the secondary current increases. When the next PWM cycle arrives, the secondary current decays to zero, which avoids the switching power supply working in CCM mode and reduces the The VDS stress of the secondary side field effect transistor.
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