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Feedback signal oblique wave compensation circuit based on digital current type PWM

A slope wave compensation and feedback signal technology, applied in electrical components, output power conversion devices, pulse duration/width modulation, etc., can solve problems such as open-loop instability and system oscillation

Inactive Publication Date: 2017-12-08
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a stable and reliable positive slope compensation superposition signal by designing a dedicated slope compensation circuit to solve the problem of open-loop instability when the duty cycle is greater than 50% in the peak current PWM control method And the system shock problem

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  • Feedback signal oblique wave compensation circuit based on digital current type PWM
  • Feedback signal oblique wave compensation circuit based on digital current type PWM
  • Feedback signal oblique wave compensation circuit based on digital current type PWM

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Embodiment Construction

[0009] The specific implementation of this circuit is as follows:

[0010] This circuit solves the problem of system oscillation when the duty cycle is greater than 50% in the digital peak current type PWM control method by generating and superimposing a ramp compensation signal. The signal waveform of the feedback current is superimposed on the compensation signal of the positive slope consistent with its cycle and duty cycle produced by this circuit, which can gradually reduce the oscillation caused by the disturbance signal, and finally the system becomes stable.

[0011] Reference figure 1 As shown, in actual work, the PWM control chip output PWM signal is applied to the main circuit and the ramp compensation circuit respectively. In the figure, area 1 is the ramp compensation circuit (that is, the key circuit of the present invention), and area 2 is the schematic diagram of the main circuit under the digital peak current type PWM control method. The PWM control chip mainly pr...

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Abstract

A feedback signal oblique wave compensation circuit based on a digital current type PWM can provide a stable and reliable oblique wave compensation superposed signal. An oblique wave can be acquired through that a chip generates an output control signals having consistent period and duty ratio with a main control signal of a peak value type PWM. System oscillation when the duty ratio is greater than 50% and an open loop is not stable in a peak value current type PWM control method can be eliminated by superposing the oblique wave signal onto a primary side feedback signal. According to the invention, the oblique wave signal can be loaded to the primary side feedback signal completely and the period and the duty ratio of the primary side feedback signal can be followed completely, so that consistence is kept.

Description

Technical field [0001] The invention belongs to a power supply device that can be applied to digital welding, and relates to applications of power electronic devices, switching power supplies and welding power supplies. Background technique [0002] The dynamic response of the welding power supply refers to the process of the power system output from the initial state to the stable state when the load is transient. The dynamic response of the power supply reflects the power supply's ability to respond to sudden changes in the load, which is to evaluate the power loop One of the most important means of stability. With the vigorous development of digital welding power supply, the control method of switching power supply has also been widely used in digital inverter welding machines. The corresponding switching power supply control methods include pulse frequency modulation (PFM), pulse width modulation (PWM) and hybrid debugging. Among them, the PWM debugging method has the charac...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K7/08H02M1/08
CPCH02M1/08H03K7/08
Inventor 黄鹏飞代宏博张华栋胡伊通刘飞卢振洋
Owner BEIJING UNIV OF TECH