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Externally synchronizing multiphase pulse width modulation signals

A technology of external synchronization and pulse width modulation, applied in pulse duration/width modulation, output power conversion devices, electrical components, etc., can solve problems such as loss of synchronization period information, corruption of multi-phase PWM waveforms, etc.

Active Publication Date: 2010-11-03
MICROCHIP TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of multi-phase PWM generation, the loss of synchronous cycle information results in corrupted multi-phase PWM waveforms

Method used

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  • Externally synchronizing multiphase pulse width modulation signals
  • Externally synchronizing multiphase pulse width modulation signals
  • Externally synchronizing multiphase pulse width modulation signals

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Embodiment Construction

[0028] Reference is now made to the drawings, which schematically illustrate details of example embodiments. Like elements in the drawings will be represented by the same numbers, and like elements will be represented by the same numbers with different lowercase letter suffixes.

[0029] refer to figure 1 , which depicts a schematic block diagram of a pulse width modulation (PWM) power controller 102 and a schematic connection diagram of the power driver circuit 106 . The PWM power controller 102 may include a digital device 104 having multiple PWM signal generation capabilities and a power driver circuit 106 for driving a load (eg, a motor, induction heater, etc.). Power driver circuit 106 may include power driver transistors 110 and 112 for alternately connecting the load (not shown) to +V (transistor 110 on) or -V (transistor 112 on). Both transistors 110 and 112 cannot be turned on at the same time, otherwise a current shoot-through can occur, which can be very destruct...

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Abstract

Waveform errors between multiphase PWM signals caused by external synchronization signals is solved by providing a capture register in a master time base circuit. The capture register is triggered by the external sync signal so as to 'capture' the value of the master time base counter at the occurrence of the rising edge of the external sync signal. This captured counter value is then provided to the local time bases of each of the phase PMW signal generators as the effective PWM period instead of locally stored PWM period values of each PWM signal generator. The captured time base value provided to the individual PWM generator time bases insures that the individual PWM generators remain properly synchronized to the master time base throughout the PWM cycles of all of the phases.

Description

[0001] Related patent applications [0002] This application asserts commonly owned sequence titled "Externally Synchronizing Multi-Phase Pulse WidthModulation Signals" filed January 23, 2008 by Bryan Kris Priority to U.S. Provisional Patent Application No. 61 / 022,980, which is hereby incorporated by reference for all purposes. technical field [0003] The present invention relates to the use of pulse width modulation, and more particularly to externally synchronized multiphase pulse width modulated signals. Background technique [0004] A pulse width modulation (PWM) controller is effective for controlling the voltage level in the power supply and for controlling the speed and direction of rotation of the motor. For motor control, direct current (DC) power is turned on and off at various rates to generate an alternating current (AC) waveform that is used to control the speed and direction of rotation of the motor. Electric motors and some power loads require multi-phase ...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H03K7/08
CPCH03K7/08
Inventor 布赖恩·克里斯
Owner MICROCHIP TECH INC
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