A switching power supply adaptive spread spectrum circuit and its adaptive spread spectrum method
A switching power supply, self-adaptive technology, applied in the direction of electrical components, regulating electrical variables, output power conversion devices, etc., can solve problems such as inability to work and large output fluctuations
Active Publication Date: 2020-09-08
CRM ICBG (WUXI) CO LTD
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Problems solved by technology
[0016] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a switching power supply adaptive spread spectrum circuit and its adaptive spread spectrum method, which is used to solve the problem that the DC switching power supply converter in the prior art cannot work at 100 In the % duty cycle working mode, the output fluctuation becomes larger, etc.
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[0077] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.
[0078] see Figure 3 ~ Figure 4 . It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbi...
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The invention provides a switching power supply adaptive frequency spreading circuit and an adaptive spreading method thereof, comprising: an oscillator module for generating an oscillating signal, turning on a power switch tube at the rising edge of the oscillating signal; a slope compensation module for generating a slope compensation signal, When working in a low duty cycle state, perform slope compensation on the rising edge of the oscillating signal, and turn off the slope compensation when the power switch is turned off; when working in a high duty cycle state, perform slope compensation on the rising edge of the oscillating signal Slope compensation, turn off the slope compensation when the power switch tube is turned on for more than the set time; when the sum of the inductance sampling signal and the slope compensation signal is greater than the set value, the pulse width modulation module turns off the power switch tube. The present invention has the function of providing the oscillating frequency signal itself, and also realizes the automatic control of the superposition of the slope compensation current when the duty cycle is high up to 100% through the newly added internal feedback signals, and at the same time, the frequency adaptively widens Function.
Description
technical field [0001] The invention relates to the field of electronic circuits, in particular to a switching power supply adaptive spread spectrum circuit and an adaptive spread spectrum method thereof. Background technique [0002] The step-down DC converter (Buck) using the peak current control mode is currently the most widely used step-down topology control mode, which is used to convert a high DC voltage into a stable lower DC voltage. The circuit adopts The fixed clock is turned on and the peak current is turned off. That is, every time the rising edge of the oscillator comes, the switch tube is turned on, and the inductor current starts to rise. When the inductor current rises to the design value, the relevant comparator is triggered, the switch tube is turned off, the freewheeling tube is turned on, and the inductor current starts to drop; When the next rising edge of the oscillator comes, the switch tube is turned on again, and the above process is repeated. When...
Claims
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IPC IPC(8): H02M3/158H03K7/08
CPCH02M3/158H03K7/08H02M1/0003
Inventor 贾晓鹏尤勇
Owner CRM ICBG (WUXI) CO LTD