Method for switching power inverter by PSM or PWM dual-module modulation

A power converter and modulation mode technology, which is applied in conversion devices and instruments for converting DC power input into DC power output and output power, etc., can solve the problems of not flexibly considering the change of switching point, unable to achieve the highest output efficiency, etc. Reduced switching times, reduced switching losses, and improved output efficiency

Inactive Publication Date: 2009-09-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, because the designed comparison threshold is fixed, these methods do not flexibly consider the change of the switching point with the input voltage, and usually cannot achieve the highest output efficiency in the entire range.

Method used

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  • Method for switching power inverter by PSM or PWM dual-module modulation
  • Method for switching power inverter by PSM or PWM dual-module modulation
  • Method for switching power inverter by PSM or PWM dual-module modulation

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Embodiment Construction

[0026] Such as figure 2 As shown, taking the Boost power converter as an example, the PSM / PWM dual-mode modulation switching method provided by the present invention is specifically described. figure 2 Middle: Vin is the input voltage, Vout is the output voltage, C is the capacitor, D is the diode, L is the energy storage inductor, R1 and R2 are the output voltage divider resistors, PowerMOS is the power MOS tube, PSM is the PSM modulation mode control circuit, PWM is the PWM modulation mode control circuit, Driver is the power MOS tube driver, ADC is the analog-to-digital converter, MUX2 is the two-to-one signal selector, LOAD is the load, CS is the load current sampling circuit, and DSP (CPU) is the digital signal processing device (microprocessor), I 2 C / SPI is a digital interface circuit.

[0027] In this example, firstly, the device parameters of the inductor L, capacitor C, power MOS transistor, and diode D of the power converter are sent offline to the DSP (or CPU)....

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Abstract

The invention provides a method for switching a power inverter by PSM or PWM dual-module modulation, belonging to the field of power and electron technology and relating to the technology for modulating a switch power tube used in a power converting circuit. By comparing the levels of the output efficacy eta [PSM] and the output efficacy eta [PWM] of the power inverter under the PSM or the PWM modulation mode, which are calculated on line by DSP (or CPU), modulation mode switching points of the power inverter under different loads are obtained: when the eta [PSM] is higher than or equal to the eta [PWM], the PSM modulation mode is used for driving a main power tube of the power inverter to work; when the eta [PSM] is lower than the eta [PWM], the PWM modulation mode is used for driving the main power tube of the power inverter to work; and when the result of comparison of the eta [PSM] with the eta [PWM] is changed, the modulation modes of the power inverter are switched between the PSM modulation mode and the PWM modulation mode; and therefore, the highest output efficacy in the range of entire journey load of the power inverter is realized, and the low power consumption running of the power inverter is ensured. The method is especially suitable for a power management chip of a portable product SoC.

Description

technical field [0001] A PSM or PWM dual-mode modulation switching method for a power converter belongs to the technical field of power electronics, and relates to a modulation technology applied to a switching power tube in a power conversion circuit. Background technique [0002] In power converters, pulse width modulation mode PWM (Pulse Width Modulation) and pulse frequency modulation mode PFM (Pulse Frequency Modulation) are often used. Due to the fact that under light load, the output efficiency of the converter using the PWM modulation mode may only be 50-70%. In recent years, a new modulation mode of the power conversion system-Pulse Skip Modulation mode (Pulse Skip Modulation) is more and more applied to In switching power supplies, especially in power integrated circuits with small and medium power. In view of the fact that PSM has higher output efficiency under light load, and PWM modulation mode still has advantages under medium and heavy loads, the dual-mode mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02M3/00
CPCY02B70/16Y02B70/10
Inventor 罗萍邓雯君李航标甄少伟
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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