Method for switching power inverter by PSM or PWM dual-module modulation
A technology of power converter and modulation mode, which is applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc. It can solve the problems of not flexibly considering the change of the switching point and the inability to achieve the highest output efficiency, etc., to achieve Effect of reducing switching loss and improving output power efficiency
Inactive Publication Date: 2011-07-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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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.
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[0027] In this example, the inductance L, capacitance C, power MOS tube, and diode D of the power converter are first sent to DSP (or CPU).The converter is then detected in the input voltage VIN and load current IO (load current IO is detected by the load current sampling circuit CS).The input voltage VIN and the load current IO transform into a digital signal through the modulus converter ADC, and then via i through i 2 The C / SPI interface is transmitted to DSP (or CPU), and DSP (or CPU) is based on the input voltage VIN and load current IO. The power of the PWM and PSM modulation mode is used as the following formula (1), (2) online calculation.The output effect of the converter, and then the η PSM Harmonious PWM The two output effects are compared, 功 PSM ≥η PWM , Output logic control signal "0", η PSM PWM , Output logic control signal "1", the output result of the DSP (or CPU) passed I 2The C / SPI interface is passed back to the control circuit of the power converter. When the t...
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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] The PSM or PWM dual -dimensional modulation switching method of the power converter belongs to the field of power electronic technology, involving the modulation technology of switching power tube applications in the power transformation circuit. Background technique [0002] In the power converter, the pulse width modulation mode PWM (Pulse Width Modulation) and the pulse frequency modulation PFM (Pulse Frequency Modulation).In the switching power supply, especially the power integration circuit of small and medium power.In view of the high output effect of PSM under light load, the PWM modulation mode still has advantages in the middle and heavy loads, so the dual -mode modulation mode of PSM or PWM is gradually popular.There is no recognized optimal switching method in PSM or PWM dual -dual -modular modular power integration circuits.The usual switching method is to compare the feedback voltage or load current with the set threshold through the internal ...
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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