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Digital soft switching modulator

A soft switching and modulator technology, applied in the field of digital soft switching modulators, can solve the problems that LLC resonant converters cannot be widely used, and the duty ratio can adjust the voltage, etc., and achieve the effect of simple circuit, easy implementation, and wide application fields

Pending Publication Date: 2022-07-12
徐志红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the defects of the prior art, the object of the present invention is to provide a digital soft-switching modulator, which aims to solve the problem that the existing LLC resonant converter cannot adjust the voltage by changing the duty cycle and needs power factor when the frequency is fixed. The use of the rectifier PFC together leads to the problem that the LLC resonant converter cannot be widely used

Method used

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  • Digital soft switching modulator
  • Digital soft switching modulator
  • Digital soft switching modulator

Examples

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Embodiment

[0040] like figure 1 As shown, an embodiment of the present invention provides a digital soft-switching modulator, including: an A / D converter, a logic converter, a soft switch, and a D / A converter;

[0041] A / D converter is used to digitize the analog feedback voltage;

[0042] More specifically, as figure 2 As shown, the A / D converter is a comparator U1, the analog feedback voltage FB is input to the non-inverting input terminal, the reference voltage VREF is input to the inverting input terminal, and the output is the comparison output signal VO1; the comparator U1 is a one-bit A / D converter, its working waveform is as Image 6 VREF, FB and VO1 shown; wherein, the reference voltage VREF is compared with the analog feedback voltage FB, and the output comparison output signal VO1 controls the stop and operation of the soft switch drive; more specifically, when the reference voltage VREF is a stable voltage When the analog feedback signal FB is greater than the reference vo...

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Abstract

The invention provides a digital soft switching modulator, which belongs to the field of digital control, resonant soft switching power supply and pulse density modulation, and comprises an A / D (analog / digital) converter, a logic converter, a soft switch and a D / A (digital / analog) converter. The A / D converter is used for comparing the analog feedback voltage with the reference voltage and outputting a comparison output signal; the logic converter receives the comparison output signal, and when the comparison output signal is at a low level, the output of the driving signals G1 and G2 is controlled by combining a pair of complementary excitation square wave signals and a direct current square wave signal; the soft switch is used for driving the MOS tube by adopting a driving signal and outputting an alternating-current square-wave pulse; the D / A converter obtains an analog output voltage through the pulsating direct-current square wave rectified by the LC low-pass filter; and after the analog output voltage is divided, analog feedback voltage is output through optical coupler isolation. The digital soft switching modulator provided by the invention has the advantages of simple circuit, high conversion efficiency and wide application.

Description

technical field [0001] The invention belongs to the fields of digital control, resonant soft-switching power supply and pulse density modulation, and more particularly, relates to a digital soft-switching modulator. Background technique [0002] With the gradual realization of the goals of carbon peaking and carbon neutrality, scientific and technological innovation must be taken as the forerunner, and the high-efficiency conversion of power electronics and reliable electronic control technology are urgently required. [0003] The existing digital switching power supply uses square wave duty cycle PWM modulation, which requires digital processing technology chip DSP and program code to control, and the entire control process is relatively complicated; and the PWM wave control power device processed by the existing numerical control technology is hard switching, Efficiency cannot be improved. [0004] The existing soft switching technology originally proposed a 100% duty cyc...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M1/14H02M1/32
CPCH02M7/219H02M1/14H02M1/32Y02B70/10
Inventor 徐志红
Owner 徐志红