A dynamic fast response circuit and method for switching power supply
A fast-response, switching power supply technology, applied in the direction of high-efficiency power electronic conversion, electrical components, and adjustment of electrical variables, can solve problems such as invisible green down-frequency working mode, poor dynamic response, and slew rate limitation of compensator compensation capacitors.
Active Publication Date: 2017-02-15
MORNSUN GUANGZHOU SCI & TECH
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Problems solved by technology
As we all know, to make the loop of the switching power supply stable and effectively suppress the switching noise, the closed-loop bandwidth of the control loop should be less than one-tenth of the switching frequency, so the light-load down-frequency control mode further limits the bandwidth of the control loop , making the dynamic response worse than that of the unreduced frequency
Although the light-load green down-frequency working mode is widely used in ACDC control chips, it is because of the poor dynamic response that the green down-frequency working mode is hardly seen in the controller of the DCDC electrical isolation converter.
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[0019] In the following detailed description, some exemplary embodiments of the present invention are only described for better understanding of the content of the present invention. As those skilled in the art would realize, the embodiments described herein may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are illustrative rather than restrictive.
[0020] see figure 2 , a dynamic fast response circuit for a switching power supply provided by the present invention, which has the functions of fast response to drop and fast response to overshoot, so it includes two-way detection and corresponding response module circuits. The first drop fast response circuit includes: a level shift module 11, a voltage sampling module 12, a comparison latch module 13, a control pulse generator 14, a drop fast response module 15, and the input port and control of the level shift module 1...
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A dynamic quick response method of a switching power supply. The method comprises the following steps: a drop quick response step, i.e., when it is detected that the voltage at an FB end suddenly increases rapidly, sending a drop dynamic response signal, rapidly providing current to the FB end, and stopping providing the current to the FB end after the voltage at the FB end rises to a first preset value; an overshoot quick response step, i.e., when it is detected that the voltage at the FB end suddenly decreases rapidly, sending an overshoot dynamic response signal, rapidly extracting the current at the FB end, and stopping extracting the current at the FB end after the voltage at the FB end drops to a second preset value; and a steady state judgment step, i.e., judging whether a voltage loop of the switching power supply enters a steady state, if the voltage loop enters the steady state, allowing the output of the drop dynamic response signal or the overshoot dynamic response signal, and if the voltage loop does not enter the steady state, not allowing the output of the drop dynamic response signal or the overshoot dynamic response signal. The method can increase the dynamic response speed of the switching power supply.
Description
technical field [0001] The invention relates to a controller for a switching power supply with secondary side feedback, in particular to the dynamic response of the output voltage of the switching power supply. Background technique [0002] With the continuous development of switching power supply technology, switching power supply has become the main power supply for electrical appliances, and transformers are used to achieve electrical isolation to improve safety. figure 1 It is a flyback switching power supply commonly used for secondary side feedback control. Resistors R1 and R2 are output voltage sampling resistors. Their divided voltage is used as the input signal of TL431. The signal is amplified by the transconductance amplifier composed of TL431 and optocoupler and then transmitted to The FB input terminal of the controller (the FB input terminal of the controller is also called the voltage feedback input terminal of the controller, hereinafter collectively referred...
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IPC IPC(8): H02M3/335
CPCH02M3/335Y02B70/10
Inventor 唐盛斌
Owner MORNSUN GUANGZHOU SCI & TECH