Method and apparatus for adjusting current amongst phases of a multi-phase converter
A converter, current technology, applied in the direction of conversion equipment without intermediate conversion to AC, conversion equipment with reversible, adjustment of electrical variables, etc.
Inactive Publication Date: 2007-09-19
INTERNATIONAL RECTIFIER COEP
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Problems solved by technology
However, for two-phase or three-phase converters, the use of integrated circuits creates more complexity than necessary and requires the use of multiple chips
Method used
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[0017]Referring to Figure 1, a block diagram of a two-phase buck converter is shown. A control chip 10, the block diagram of which is shown in more detail in FIG. 2, receives a plurality of digital inputs VID0-VID5, indicated as 12 in FIG. The VID input is accepted from the powered microprocessor and is a digital bit that sets the voltage output of the converter under different conditions. For example, for an Intel VR10 chip, the output voltage varies between 0.8375V and 1.6000V depending on the setting of the digital bits on VID0 to VID5, which is determined by the chip manufacturer. The pin VIN_SEL is used to indicate which processor chip is being powered so that the control chip 10 can interpret the VID code. For example, if the VID SEL is grounded, the processor chip is an INTEL VR10, and the VID code will be interpreted to provide the proper voltage to such a chip. If VID_SEL is VCC, the processor is AMD ATHLON. If VID_SEL is left open, the processor is AMD HAMMER. Fo...
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A multiple-phase DC-DC converter has a first series circuit comprising first and second output transistors coupled across an input voltage, a first phase voltage being provided at a first common connection between the first and second transistors, at least one second series circuit comprising third and fourth output transistors coupled in series across the input voltage, a second phase voltage being provided at a second common connection between the third and fourth transistors, a first output inductor for the first phase, at least one second output inductor for the at least one second phase, an output capacitor, a first pulse width modulator circuit comprising a first pulse width modulator comparator and a first fixed slope ramp generator, the first fixed slope ramp generator supplying a fixed slope ramp signal to one input of the first comparator, at least one second pulse width modulator circuit comprising a second pulse width modulator comparator and a variable slope ramp generator, the variable slope ramp generator supplying a variable slope ramp signal to one input of the second comparator, an error amplifier for comparing the output voltage of the converter to a reference voltage and providing an error amplifier output voltage to respective second terminals of each of the first and at least one second pulse width modulator comparators, a first current sense amplifier for determining the phase current in a first phase of the converter provided by the first series circuit.
Description
Background technique [0001] This invention relates to power supplies, and more particularly to multiphase converter power supplies, and more particularly to multiphase buck converter power supplies for providing low voltage, high current power to portable computing devices such as notebook and laptop computers. [0002] Multiphase buck converter switching power supplies are currently used to provide low-voltage, high-current, high-efficiency power for portable computing devices such as laptops and notebooks. [0003] The present invention relates to a multiphase converter power supply in which the current between two or more phases is automatically adjusted so that the phases automatically adjust the distribution when providing power to a load. Accordingly, the present invention provides a method and apparatus to allow multiple phases of a multiphase buck converter power supply to be equally distributed in providing power to a load. Thus, according to the invention, if a high...
Claims
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IPC IPC(8): H02M3/24H02M5/42H02M7/44H02M7/68H02M3/158
CPCH02M3/1584H02M3/04H02M3/24
Inventor D·克拉韦特
Owner INTERNATIONAL RECTIFIER COEP