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Control circuit and control method for staggered parallel type switching power supply

A technology of switching power supply and control circuit, which is applied in the direction of control/regulation system, electrical components, and adjustment of electric variables, etc., and can solve the problems that it is difficult to achieve interleaved parallel connection of two voltage adjustment circuits

Active Publication Date: 2014-01-01
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a control circuit and control method for an interleaved parallel switching power supply to solve the problem that it is difficult to achieve interleaved parallel connection between two voltage adjustment circuits when the constant on-time control method is applied to the interleaved parallel switching power supply The problem

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  • Control circuit and control method for staggered parallel type switching power supply
  • Control circuit and control method for staggered parallel type switching power supply
  • Control circuit and control method for staggered parallel type switching power supply

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Embodiment 1

[0079] Such as figure 2 As shown, the embodiment of the present invention provides a control circuit for an interleaved parallel switching power supply. The interleaved parallel switching power supply includes a first voltage adjustment circuit and a second voltage adjustment circuit that are interleaved in parallel. In this embodiment Among them, the two voltage adjustment circuits are both buck circuits. It is conceivable that the two voltage adjustment circuits can also be boost circuits (boost circuits) or flyback circuits (flyback circuits) and other topological circuits. , which do not affect the control scheme of the control circuit, the input terminal of the interleaved parallel switching power supply is connected with the input power supply v i , the voltage regulation circuit is used to increase or decrease the input power supply v i voltage, and output a DC power supply voltage with higher quality through the output terminal of the interleaved parallel switching p...

Embodiment 2

[0121] Compared with the control circuit for the interleaved parallel switching power supply in the first embodiment of the present invention, the difference lies in that the composition of the second switch control circuit is different, and other circuit structures are the same as those in the first embodiment, here I won't go into details.

[0122] Such as image 3 As shown, in the control circuit for the interleaved parallel switching power supply provided by the embodiment of the present invention, the second switch control circuit includes a second comparator A2, a phase difference judgment circuit 4031, a charge and discharge signal generation circuit 4032, a first A current signal generating circuit, a second shutdown signal generating circuit and a second RS flip-flop RS2,

[0123] The inverting input terminal of the second comparator A2 receives the voltage signal V representing the inductor current in the second voltage adjustment circuit iL2 , the non-inverting in...

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Abstract

The invention provides a control circuit and control method for a staggered parallel type switching power supply. The switching power supply comprises two voltage adjustment circuits which are in staggered parallel connection, the input end of the staggered parallel type switching power supply is connected with an input power supply, and the voltage adjustment circuits are used for increasing or reducing the voltages of the input power supply and for outputting direct-current supply voltages with higher quality through the output end of the staggered parallel type switching power supply. The control circuit comprises a feedback compensation signal producing circuit, a first switching control circuit and a second switching control circuit. According to the control circuit and control method for the staggered parallel type switching power supply, the phase difference of main switching tubes of the two voltage adjustment circuits is forcibly modulated to be 180 degrees, and the problem that staggered parallel connection between the two voltage adjustment circuits can not be achieved easily when a constant breakover time control mode is applied to the staggered parallel type switching power supply is solved.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to a control circuit and a control method for an interleaved parallel switching power supply. Background technique [0002] In a switching power supply, in order to reduce the burden on power devices, increase the power density of the power supply, reduce the output voltage ripple, and make the output voltage of the switching power supply have higher quality, the main circuit is often connected in an interleaved and parallel manner. [0003] Such as figure 1 As shown, taking the main circuit as an example of two buck circuits (step-down circuits) in interleaved parallel connection, the conventional interleaved parallel switching power supply includes the first voltage adjustment circuit, the second voltage adjustment circuit and the output capacitor C o , the first voltage adjustment circuit includes a first main switch Q1, a first inductor L1 and a first freewheeling diode D11, and t...

Claims

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Application Information

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IPC IPC(8): H02M3/155
CPCH02M3/1584H02M1/0009H02M3/1586H02M3/158
Inventor 余峰赵晨
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD