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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 affecting system efficiency and large static loss, and achieve the effect of reducing system efficiency, reducing static power loss and improving conversion efficiency

Inactive Publication Date: 2012-12-12
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 alternative 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 the sampling voltage Vsense image 3 It can be seen from the state transition diagram of the finite state machine that when A1A0=00, the state will move to a lower state by one bit, and the state output code B2B1B0 at this time will also be changed accordingly, so as to select the switching frequency and 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 is gradually reduced, the selected clock frequency is also gradually reduced.

[0015] When the sampling voltage Vsense>Vthp, the comparator output code A1A0=11. When the rising edge of the switching clock triggers the finite state machine, the slave i...

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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 Patents(China)
IPC IPC(8): H02M3/07
Inventor 王科军李文宏宫艳
Owner FUDAN UNIV
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