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Method and system for controlling output of power bridge precisely

A precise control, power bridge technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as low precision, and achieve the effects of high precision, wide application range and good scalability

Active Publication Date: 2017-11-10
CHENGDU YICHONG WIRELESS POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Existing schemes use high-frequency counting to control the phase difference of the PWM pair. A high main frequency is required to produce the required phase accuracy, or a low main frequency can only produce low precision.

Method used

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  • Method and system for controlling output of power bridge precisely
  • Method and system for controlling output of power bridge precisely
  • Method and system for controlling output of power bridge precisely

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Embodiment Construction

[0020] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0021] Any feature disclosed in this specification, unless specifically stated, can be replaced by other alternative features that are equivalent or have similar purposes. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0022] In this embodiment, the first ramp voltage RAMP1 and the second ramp voltage RAMP2 are used.

[0023] Using a digital-to-analog converter (DAC) with a first reference voltage terminal and a second reference voltage terminal, a first reference voltage V1 and a second reference voltage V2 are generated, wherein the first reference voltage V1 and the second reference voltage V2 have a voltage difference ΔV .

[0024] Comparing the first reference voltage V1 and the second reference voltage V2 wi...

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PUM

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Abstract

The invention, which relates to the technical field of a power bridge, discloses a method and system for controlling the output of a power bridge precisely. The method comprises: a first reference voltage and a second reference voltage are generated by using a digital analogue converter; the first reference voltage and the second reference voltage are compared with a ramp voltage to obtain a first pulse width modulation (PWM) and a second PWM, wherein a phase difference exists between the first PWM and the second PWM; and the first PWM and the second PWM are applied to two ends of a load by a driver to control the output of a power bridge. According to the method disclosed by the invention, a PWM pair with a small phase difference is generated, no high main frequency is needed, the precision of the generated phase difference is high; and the extendibility is high. With the PWM pair with the small phase difference, the output of the power bridge can be controlled precisely. In addition, the invention also discloses a system for controlling the output of a power bridge precisely.

Description

technical field [0001] The invention relates to the technical field of power bridges, in particular to a method and system for precisely controlling the output of a power bridge. Background technique [0002] The PWM (pulse width modulation) waveform can drive the power bridge with an external drive circuit, but to accurately control the power of the full-power bridge (or half-power bridge), there must be two PWMs (PWM pairs) with relatively small phase differences. [0003] Existing schemes use high-frequency counting to control the phase difference of the PWM pair. A high main frequency is required to produce the required phase accuracy, or a low main frequency can only produce low precision. Such as figure 1 As shown, MCLK represents the main frequency that produces a phase difference. To make PWM_A and PWM_B produce a phase difference ΔT of 0.42°, the main frequency f MCLK is the reference frequency f REF 360 / 0.42=857 times of . if required f REF =200kHz, f MCLK =2...

Claims

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Application Information

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IPC IPC(8): H02M1/00
CPCH02M1/00H02M1/0012H02M1/0025
Inventor 戴义红
Owner CHENGDU YICHONG WIRELESS POWER TECH CO LTD