Clock frequency selection circuit suitable for switching power converter

A technology of clock frequency and switching power supply, which is applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problems of large static loss and affecting system efficiency, and achieve the effect of reducing static power loss, reducing system efficiency and improving conversion efficiency

Inactive Publication Date: 2011-06-01
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is simple and easy to implement, but the biggest disadvantage is that it requires several comparators to implement. If you want to select N frequencies, you need at least N comparators. We know that the comparators have a certain static power consumption. If the alternative frequency More, then there will be a relatively large static loss, which will greatly affect the efficiency of the system at light load

Method used

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  • Clock frequency selection circuit suitable for switching power converter
  • Clock frequency selection circuit suitable for switching power converter
  • Clock frequency selection circuit suitable for switching power converter

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the 6 candidate frequencies in the state comparison table. Here select V1=62.5mV, V2=125mV, V3=250mV, V4=250mV, V5=500mV, V6=1V, V7=5V(VDD).

[0014] When sampling voltage Vsense When image 3 It can be seen from the state transition diagram of the finite state machine that when A1A0=00, the state will move one bit to a lower state. At this time, the state output code B2B1B0 is also changed accordingly to select the switching frequency and the switching frequency in the new state. Threshold voltage. When the sampling voltage Vsense jumps from 1.2V to 50mV, check the selection of the clock frequency. From Figure 4 It can be clearly seen that when the sampling voltage gradually decreases, the selected clock frequency also gradually decreases.

[0015] When the sampling voltage Vsense> At Vthp, the output code of the comparator is A1A0=11. When the rising edge of the switching clock triggers the finit...

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Abstract

The invention belongs to the technical field of integrated circuits, in particular relates to a clock frequency selection circuit suitable for a switching power converter. The clock frequency selection circuit comprises two comparators, a finite state machine (FSM) and two multiplexers. The clock frequency selection circuit is applied to a switching power direct-current (DC)/DC converter, and hasthe advantages that the comparators are not required to increase and the encoding of the FSM is modified only so that multiple alternative frequencies can be selected freely, thus reducing the statical power consumption of a system and improving the system efficiency of the switching power converter.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and specifically relates to a clock frequency selection circuit, which is mainly used in switching power supply DC / DC converters. Background technique [0002] Switching power supply DC / DC converter is a kind of circuit that uses inductance or capacitance as the energy transmission medium, and realizes level conversion through periodic clock pulse control. It is widely used in various consumer products. Compared with the switchless linear rectifier LDO, its biggest advantage is high efficiency. Therefore, the improvement of efficiency is also the most concerned issue in the research and development of switching power converters. [0003] Usually, what determines the length of standby time of various consumer electronic products is often the power conversion efficiency during standby. For the efficiency at light load, one solution is to select an appropriate switching frequency acco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07
Inventor 王科军李文宏宫艳
Owner FUDAN UNIV
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