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Control Circuit for Interleaved Parallel Switching Power Supply

A technology of switching power supply and control circuit, which is applied in the direction of conversion equipment without intermediate conversion to AC, and can solve the problem that it is difficult to achieve interleaved parallel connection of two voltage adjustment circuits

Active Publication Date: 2016-05-25
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 invention provides a control circuit 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

Method used

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  • Control Circuit for Interleaved Parallel Switching Power Supply
  • Control Circuit for Interleaved Parallel Switching Power Supply
  • Control Circuit for Interleaved Parallel Switching Power Supply

Examples

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Embodiment 1

[0087] like 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 In the above, the two voltage adjustment circuits are both buck circuits (step-down circuits). It is conceivable that the two voltage adjustment circuits can also be both boost circuits (boosting circuits) or buck-boost circuits (boosting circuits). Voltage circuit) 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 to 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 te...

Embodiment 2

[0148] 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.

[0149] like Image 6 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,

[0150] 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 input...

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Abstract

The invention provides a control circuit for an interleaved parallel switched-mode power supply. The switched-mode power supply comprises two voltage adjusting circuits which are interleaved and parallel, the input end of the interleaved parallel switched-mode power supply is connected with an input power supply, the voltage adjusting circuit is used for raising or lowering the voltage of the input power supply, and outputting direct current power supply voltage with higher quality by virtue of the output end of the interleaved parallel switched-mode power supply, and the control circuit comprises a feedback compensation signal generation circuit, a first switch control circuit, a second switch control circuit and a snatchy mode compensation circuit. The control circuit for the interleaved parallel switched-mode power supply, provided by the invention, can be used for forcedly modulating the phase difference of main switching tubes in the two voltage adjusting circuits to be 180 DEG, and solving the problem of difficulty in interleaved and parallel connection of the two voltage adjusting circuits when a constant on-time control method is applied to the interleaved parallel switched-mode power supply.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to a control circuit for interleaved parallel switching power supplies. 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] like 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 the second voltage adjustm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/10
Inventor 蔡勇斌
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD