Multi-Phase Switching Mode Power Supply with Adaptive Synchronous Drivers

a technology of synchronous drivers and power supplies, applied in the direction of electric variable regulation, process and machine control, instruments, etc., can solve the problems of discontinuous high-side switch current, reduce the efficiency of multi-phase power converters, and add complexity to converters, so as to achieve the effect of minimizing noise rippl

Active Publication Date: 2021-04-29
WAVIOUS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach enhances efficiency by minimizing power consumption and reducing component complexity, maintaining stability and efficiency without modifying basic PWM mechanisms, while reducing energy waste and noise susceptibility.

Problems solved by technology

A significant drawback of this approach is that the sensing resistors waste the output energy and thereby reduce the efficiency of the multi-phase power converter.
But, a drawback of this approach is that the high-side of the switches change state at a relatively high rate (e.g., greater than 250 KHz) and, as a result, the high-side switch current is discontinuous.
Not only does this add complexity to the converter, but there is also a time delay in regulating the output current that diminishes the stability of the converter.
A drawback of this approach is that the current sense signal has relatively small amplitude that is close to the noise floor and therefore highly susceptible to distortion due to high frequency noise.
While the high frequency noise can be removed using low pass filters, it substantially increases the component count and complexity of the power converter to include separate low pass filters for each of the channels.
When the current being pulled by the load becomes small, the current waveform can dip below zero, which means that current is being sent to ground from the energy stored in the load capacitance and this becomes wasted power.

Method used

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  • Multi-Phase Switching Mode Power Supply with Adaptive Synchronous Drivers
  • Multi-Phase Switching Mode Power Supply with Adaptive Synchronous Drivers
  • Multi-Phase Switching Mode Power Supply with Adaptive Synchronous Drivers

Examples

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Embodiment Construction

[0033]FIG. 2 is a schematic block diagram of a multi-phase switching mode power supply (SMPS) with adaptive synchronous drivers. The multi-phase SMPS 200 comprises a pulse width modulator (PWM) 202 having a feedback input on line 204 to accept a load voltage and an output on lines 206-1 through 206-n to supply n periodic interleaved modulation pulses having a pulse width responsive to the load voltage. n is a positive integer greater than 1. The SMPS 200 comprises n synchronous drivers 208-1 through 208-n. Drivers 208-1 through 208-n have respective inputs on lines 206-1 through 206-n to accept corresponding modulation pulses. Drivers 208-1 through 208-n have respective outputs on lines 210-1 through 210-n to supply driver pulses having a duty cycle responsive to the modulation pulses, The drivers 208-1 through 208-n have respective inputs on lines 212-1 through 212-n to accept a driver gating signals capable of enabling and disabling the drivers.

[0034]SMPS 200 further comprises n c...

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Abstract

A multi-phase switching mode power supply (SMPS) with adaptive synchronous drivers is provided. A pulse width modulator creates n periodic interleaved modulation pulses having a pulse width responsive to a load voltage. Modulation pulses are converted into selectively enabled driver pulses having a duty cycle responsive to the modulation pulse. The polarity of the voltage is detected at a completion of each driver pulse duty cycle. A comparator signal is supplied in response to comparing detected voltages to a reference voltage, and in turn, driver gating signals are supplied to selectively enable driver pulses in response to analyzing comparator signals. The comparator signals are summed and integrated. Driver pulses are enabled or disabled in response to the integrated sum. Energy is stored from each driver pulse into a corresponding inductor, and supplied as current to a load, creating the load voltage.

Description

BACKGROUND OF THE INVENTION1. Field of the Invention[0001]This invention generally relates to power supplies and, more particularly, to a multi-phase switched mode power supply capable of disabling driver phases when they are not required to supply a load voltage.2. Description of the Related Art[0002]As noted in US 2003 / 0214274, invented by Patrice Lethellier, published Nov. 20, 2003, switched mode DC-to-DC power converters are commonly used in the electronics industry to convert an available direct current (DC) level voltage to another DC level voltage. A switched mode converter provides a regulated DC output voltage to a load by selectively storing energy in an output inductor coupled to the load by switching the flow of current into the output inductor. A synchronous buck converter is a particular type of switched mode converter that uses power switches, typically MOSFET transistors, to control the flow of current in the output inductor. A high-side of the switch selectively cou...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): H02M3/158H02M3/335H02M1/08
CPCH02M3/158H02M2003/1586H02M1/08H02M3/33592H02M1/088H02M3/1584H02M3/1588H02M3/1586Y02B70/10
InventorARCUDIA, KENNETH
OwnerWAVIOUS LLC