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Digital peak current control device

A peak current control, digital-to-analog conversion circuit technology, applied in the output power conversion device, electrical components and other directions, can solve the problems of difficult to achieve digital power supply, high current sampling requirements, difficult to achieve, etc., to achieve flexible implementation methods, Low cost and high reliability

Active Publication Date: 2017-09-29
东莞市英豪智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the peak current control technology has extremely high requirements on current sampling, so this technology is widely used in analog power supplies, but it is difficult to make achievements in digital power supplies. Even if an expensive high-speed processor is used, it is difficult to achieve the same speed as analog equivalent effect

Method used

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Examples

Experimental program
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Embodiment 1

[0031] Such as figure 1 As shown, the digital peak current control device of this embodiment can be applied to switching power supplies with only one switching tube, such as buck converters, boost converters, single-ended forward converters, and single-ended flyback converters. Embodiments are applicable in discontinuous mode. It includes a sampling circuit, a given circuit, a single-chip microcomputer, a digital-to-analog conversion circuit (D / A), a rectification circuit and a peak current control circuit. The peak current control circuit includes a first comparator, a first latch and a first AND gate. The single-chip microcomputer has a first output terminal for outputting a first PWM signal (PWM1) and a second output terminal for outputting a second PWM signal (PWM2). Wherein, the pulse width of the first PWM signal is greater than the pulse width of the second PWM signal, that is, the first PWM signal defines the maximum width of the pulse.

[0032] The sampling circuit...

Embodiment 2

[0040] Such as figure 2 As shown, the difference between this embodiment and Embodiment 1 is that the peak current control circuit further includes a first waveform conversion circuit and a first adder for converting a rectangular wave into a triangular wave. Specifically, the output terminal of the rectification circuit is connected to the non-inverting input terminal of the first comparator through the first adder, and the output terminal of the first waveform conversion circuit is also connected to the first comparator through the first adder. The non-inverting input terminal of the single-chip microcomputer is also connected with the input terminal of the first waveform conversion circuit.

[0041] This embodiment is also applicable to a switching power supply with only one switching tube, such as a buck converter, a boost converter, a single-ended forward converter, and a single-ended flyback converter, but this embodiment is applicable to a continuous mode.

[0042] When...

Embodiment 3

[0044] Such as image 3 As shown, the difference between the present embodiment and the second embodiment is that an adder, a comparator, a latch and a waveform conversion circuit are added. Therefore, this embodiment is suitable for switching power supplies with two switching tubes, such as half-bridge converters and push-pull converters.

[0045] Specifically, the peak current control circuit further includes a second adder, a second latch, a second comparator, a second AND gate, and a second waveform conversion circuit for converting a rectangular wave into a triangular wave. The single-chip microcomputer also has a third output terminal for outputting a third PWM signal (PWM3) and a fourth output terminal for outputting a fourth PWM signal (PWM4). The output end of the rectification circuit is connected to the non-inverting input end of the second comparator through the second adder, and the output end of the second waveform conversion circuit is also connected to the non...

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Abstract

A digitalized peak current control device comprises a sampling circuit, a given circuit, a single chip microcontroller, a digital-analog converting circuit, a rectifying circuit, and a peak current control circuit; the peak current control circuit comprises a first comparator, a first latch, and a first AND gate; the single chip microcontroller comprises a first output end for outputting a first PWM signal and a second output end for outputting a second PWM signal; the single chip microcontroller is used for figuring out a digital signal based on an output voltage and an output current collected by the sampling circuit, and a reference signal output by the given circuit; the digital-analog converting circuit is used for converting the digital signal into an analog signal and outputting the analog signal to the first comparator; the rectifying circuit is used for rectifying an input current collected by the sampling circuit, and outputting the rectified input current to the first comparator via the output end of the rectifying circuit; a level signal output from the output end of the first AND gate is used for controlling the on and off states of a switch tube of a switching power supply. The digitalized peak current control device has the advantages of low cost, high reliability, and the like.

Description

technical field [0001] The invention relates to a digital peak current control device applied to a switching power supply. Background technique [0002] In the voltage-type control technology, in order to solve the magnetic bias problem of the transformer, an effective solution is the DC blocking capacitor technology. Although the DC-blocking capacitor technology can solve the magnetic bias problem of the transformer, the capacitor used here has high operating frequency and large current, and there are reliability problems. The peak current control technology controls the current flowing in the positive and negative directions of the transformer to ensure that the peak values ​​are equal, that is, to ensure the magnetic balance in the two directions, and to solve the problem of the magnetic bias of the transformer from the source. The peak current control technology improves the reliability of the system while reducing the cost. Therefore, peak current technology has been ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/088
CPCH02M1/08
Inventor 郭智峰
Owner 东莞市英豪智能科技有限公司
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