Control method and circuit of double-module modulation and mode smooth conversion switching power supply

A control method and mode technology, which is applied in the direction of electrical program control, electrical variable adjustment, control/regulation system, etc., can solve the problem that the dynamic response is not as fast as pulse width modulation, etc., achieve good dynamic response characteristics, improve efficiency, and reduce switching The effect of loss

Inactive Publication Date: 2010-03-10
徐嘉萍
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  • Abstract
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  • Application Information

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Problems solved by technology

However, under high current, its dynamic resp

Method used

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  • Control method and circuit of double-module modulation and mode smooth conversion switching power supply
  • Control method and circuit of double-module modulation and mode smooth conversion switching power supply
  • Control method and circuit of double-module modulation and mode smooth conversion switching power supply

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Embodiment Construction

[0026] The system control circuit involved in the present invention includes such as figure 1 The basic module shown in 128 includes a pulse width modulation circuit 115, a pulse frequency modulation circuit 114, an overcurrent protection module 113, other protection circuits 112, a gate logic signal control unit 109, a reference voltage 117, a soft start circuit 116, and a working Mode selection circuit 118 , multiplexer 111 and AND gate 110 .

[0027] figure 1 108 is the gate drive circuit of the power switching tube, and 120 is the input power supply V of the switching power supply. IN , 119 is the input filter capacitor C IN . 107 represents current detection, and its specific implementation method may vary according to the integration of power devices.

[0028] figure 1 The power circuit of the medium switching power supply is a DC / DC step-down circuit (Buck) for synchronous rectification, including two power switch tubes 105 and 106, an output filter inductor 101, a...

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Abstract

The invention relates to a control scheme of double-module operation of a direct current switching power supply, which is used for direct current voltage stabilization and improves the efficiency whenthe power supply is in underloading. Under heavier load, a system adopts a pulse width modulation (PWM) mode. When in underloading, the system automatically enters a pulse frequency modulation (PFM)mode, and outputs stable direct current voltage according to detected current and load voltage by corresponding logic. Under the PFM mode, equivalent switching frequency of the power supply is loweredfollowing the reduction of the load, and the switching loss is reduced, thereby improving the efficiency when in underloading. When the load is jumped, the system automatically performs the smooth transition between the PFM mode and the PWM mode and ensures the rapid dynamic response of the output voltage. Under the PWM mode, the system integrates feedforward control of the input voltage and increases the capacity of resisting the jump of the input voltage by the load voltage. The invention is suitable to power supply control of a portable media player, an intelligent mobile phone, a load point power supply and the like.

Description

technical field [0001] The invention relates to a DC switching power supply management system which adopts dual modes of pulse width modulation (Pulse Width Modulation: PWM) and pulse frequency modulation (Pulse Frequency Modulation: PFM) to operate in a mixed manner and can smoothly switch between the modes. It is suitable for the DC switching power supply solution where the power semiconductor switching device and the control circuit are separated, and the power supply solution where the power semiconductor switching device and the control circuit are integrated on a single chip. The invention is widely used in the fields of portable multimedia players, smart phones, point-of-load power supplies and the like. Background technique [0002] On portable devices such as smartphones, a linear low-dropout (LDO) regulator is traditionally used to convert the battery voltage to a set voltage value and transfer energy to the load. However, in recent years, due to the widespread us...

Claims

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Application Information

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IPC IPC(8): G05B19/04H02M1/08H02M3/00H03K7/08H03K7/06
Inventor 郭文南
Owner 徐嘉萍
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