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Power supply control method for constant current constant power control

A power controller, voltage control technology, applied in output power conversion devices, DC power input to DC power output, control/regulation systems, etc., can solve voltage spikes or overshoots, damage downstream equipment, power shutdown, etc. question

Active Publication Date: 2017-09-12
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Switching control back to the voltage loop can result in pulse width modulation based on a larger duty cycle than is required to achieve the desired voltage, resulting in voltage spikes or overshoot conditions that can damage downstream equipment and / or shut down the power supply

Method used

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  • Power supply control method for constant current constant power control
  • Power supply control method for constant current constant power control
  • Power supply control method for constant current constant power control

Examples

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Embodiment Construction

[0011] The present invention provides apparatus and techniques for pulse width modulating a switching power supply in which the transition from current loop operation to voltage loop operation is modified to selectively preset the output duty cycle of the voltage control loop and / or to An increase in the value of the integrator of the voltage loop compensator circuit during current control loop operation is suppressed in order to mitigate or avoid undesired output voltage spikes. The inventive concept is particularly applicable to digital power controller integrated circuits, but analog and / or combined digital / analog controller embodiments are also possible. Additionally, the power supply controller of the present invention may be used to facilitate pulse width modulated operation of any form of switching power supply, including but not limited to AC / DC converters, DC / DC converters, DC / AC converters, or inverters etc., which have one or more switching devices operating accordi...

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PUM

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Abstract

A digital power supply controller (2) is provided, which includes a voltage control loop (10) and a current control loop (20) and has a controller (30), the controller is used to output (18) or The current control loop duty cycle output (28) pulse width modulates the switching power supply (4), where the controller selectively switches the voltage control loop duty cycle output (18) before switching from current loop control to voltage loop control Preset to a predetermined value (92), and / or during current loop control, the controller suppresses an increase in the voltage loop integrator value (66a) to mitigate voltage overshoot.

Description

technical field [0001] The present invention relates to power conversion circuits, and more particularly to selective pulse width modulation (PWM) control of switching power supplies using a duty cycle from a voltage control loop or a current control loop. Background technique [0002] Switching power supplies or switching power converters are used in a variety of applications to convert power from an input source to drive a load. Control of the conversion is provided by pulse width modulation of the power switches, for example by varying the on-time or duty cycle, where the converter operates at a given switching frequency. Switching power supplies can be operated using constant current (CC) control techniques for improved reliability, allowing the power supply to continuously deliver output current above nominal and use constant voltage (CV) operation at lower power levels, Some of these power supplies operate with constant power (CP). Constant voltage operation is somet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/565G05F1/10
CPCH02M3/156H02M1/08H02M3/157
Inventor X·善光Z·叶
Owner TEXAS INSTR INC