Current sampling method of DC-DC conversion circuit, current-sharing control method and circuit

A conversion circuit and current sampling technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, electrical components, etc., can solve problems such as inability to achieve current sampling

Active Publication Date: 2017-11-21
深圳芯智汇科技有限公司
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  • Abstract
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Problems solved by technology

[0004] However, in the average current sharing method, the current is sample

Method used

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  • Current sampling method of DC-DC conversion circuit, current-sharing control method and circuit
  • Current sampling method of DC-DC conversion circuit, current-sharing control method and circuit
  • Current sampling method of DC-DC conversion circuit, current-sharing control method and circuit

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Embodiment Construction

[0042] Now in conjunction with the accompanying drawings, the preferred embodiments of the present invention will be described in detail.

[0043] Such as figure 1 Shown is a schematic diagram of an embodiment of a DC-DC conversion circuit, the DC-DC conversion circuit includes a first phase circuit, a second phase circuit, an output capacitor C out , load R Load And a current sharing control circuit of the DC-DC conversion circuit controlling the first phase circuit and the second phase circuit.

[0044] The first phase circuit includes a switch tube M1, a freewheel tube M2 and an inductor L1, and the second phase circuit includes a switch tube M3, a freewheel tube M4 and an inductor L2. The first phase circuit and the second phase circuit jointly supply the load R Load Provide current, wherein, when the switch tube M1 is turned on (the high level period of the PWM signal (PWM1_1 signal)) the current I flowing through the inductor L1 L1 , current I L1 part to the output ...

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Abstract

The invention discloses a Current sampling method of a DC-DC conversion circuit, a current-sharing control method and a circuit. The sampling method comprises the following step of triggering the sampling on the current at a set moment in a PWM signal period according to a PWM signal of a switch tube; the currentp0-sharing control circuit comprises a sampling circuit, a current difference generating circuit and a duty ratio regulating circuit; the current difference generating circuit is used for generating the current difference between the first phase current and the second phase current; and the duty ratio regulating circuit is used for regulating the duty ratio of a first phase PWM signal for controlling the first phase current or the second phase PWM signal for controlling the second phase current according to the current difference.

Description

technical field [0001] The invention relates to the field of DC-DC conversion circuits, in particular to a DC-DC conversion circuit current sampling and current equalization control method and circuit. Background technique [0002] With the increasingly powerful image processor performance of mobile devices and the increasingly complex functional modules of mobile devices, the demand for greater input current has been pushed up, coupled with the market demand for fast charging mobile power, this has jointly driven power management chips towards multi-phase Type and high current design direction. Therefore, how to design a high-performance and low-cost current-sharing control circuit for the multi-phase DC-DC converter chip is very critical. Common current sampling methods in the current-sharing control circuit include the average current method and the like. [0003] The average current sharing method is to detect the output current of each phase in the system, average the ...

Claims

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/1584H02M1/0009
Inventor 杨令王蒙
Owner 深圳芯智汇科技有限公司
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