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Resonant converter

A technology of resonant converters and resonant capacitors, applied in instruments, converting DC power input to DC power output, adjusting electrical variables, etc., can solve problems such as affecting circuit stability, non-destructive testing, sampling current switching noise interference, etc. The effect of improving dynamic performance, increasing bandwidth, and increasing efficiency

Inactive Publication Date: 2017-05-31
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 2) Although the L-C filter circuit of the power supply is a second-order circuit, after adding the current inner loop control, only when the error voltage changes, the inductor current will change
[0013] At present, the asymmetric half-bridge topology generally uses its voltage control mode, and there are few studies on its current sampling.
However, the voltage regulation rate, load regulation rate, and transient response of the voltage control mode are not as good as those of the peak current control mode, and it cannot realize cycle-by-cycle overcurrent detection, which is limited in applications.
[0014] There are two forms of current sampling for general peak current control, one is to sample the current of the primary power stage through a current transformer; the other is to use a resistance sampling circuit. These two peak current sampling methods are applied to asymmetric The circuit of the half-bridge topology is shown in Figure 3. From the theoretical analysis, it is known that the loss of these two sampling methods is very large, and they are not non-destructive testing. In addition, the waveform of the sampling current will be greatly disturbed by switching noise in high-power applications. , which seriously affects the stability of the circuit

Method used

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Examples

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no. 1 example

[0035] Figure 4Shown is the circuit schematic diagram of the switching power supply circuit of the first embodiment of the present invention, a resonant converter including a rectification filter circuit 101, an asymmetrical half-bridge flyback topology circuit 102, a current sampling circuit 103 and a peak current control system In the circuit 104, the rectification and filtering circuit 101 includes a rectification bridge D3 and a first capacitor C1, where C1 is an input filter capacitor. The asymmetrical half-bridge flyback topology circuit 102 includes a first switch tube S1, a second switch tube S2, a resonant capacitor Cr, a first transformer T1, a second diode D2, and an output filter capacitor Co. The current sampling circuit 103 includes a first The resistor Rs, the second capacitor C2, the first diode D1, and the peak current control system circuit include dead time adjustment and peak current control.

[0036] The rectifier bridge D3 in the rectifier filter circui...

no. 1 example

[0037] The working principle of the switching power supply circuit of the first embodiment of the present invention:

[0038] Only using words to describe the principle will make it difficult for those skilled in the art to understand, so please allow the use of schematic diagrams to illustrate the working principle of the present invention in conjunction with the signal flow commonly used in electronic engineering.

[0039] The rectifier bridge D3 in the rectification filter circuit 101 rectifies the alternating current into pulsating direct current, converts the pulsating direct current into direct current through the input filter capacitor, and outputs it to the asymmetrical half-bridge flyback topology circuit 102; the current sampling circuit 103 passes the current of the resonant capacitor Cr shunt, and then convert the current signal into a voltage signal through the first resistor Rs, and the first diode D1 filters out the sampled negative current signal; the peak curre...

no. 2 example

[0049] Figure 7 It is the schematic circuit diagram of the second embodiment of the present invention. The difference from the first embodiment is that the connection of the diode D1 is different. The anode of the first diode D1 is connected to the series node of the first resistor Rs and the second capacitor C2. The first The cathode of the diode D1 outputs a current sampling signal to the peak current control system circuit.

[0050] The connection relationship of other components is the same as that of the first embodiment, and the circuit principle is also the same, which will not be repeated here.

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Abstract

The invention provides a resonant converter. By virtue of the resonant converter, some problems existing in the prior art can be solved; an asymmetrical half-bridge flyback topology and other resonant topologies can realize a peak value current control mode without being limited by power level; and improvement of voltage adjustment rate, load adjustment rate, dynamic response and other performance can be realized. Compared with the prior art, the resonant converter can achieve the beneficial effects as follows: the peak value current control mode can be realized on the asymmetrical half-bridge flyback topology and similar topologies; low-loss peak current sampling is realized and power supply efficiency is improved; leading edge blanking is not required, noise interference can be eliminated, and real-time property of a control strategy can be improved; and by adoption of the peak value current control mode, bandwidth can be improved, and dynamic performance can be enhanced.

Description

technical field [0001] The invention relates to a resonant converter. Background technique [0002] Engineers who are familiar with switching power supplies know that PWM switching regulated power supplies are a closed-loop control system. Use this difference to adjust the conduction pulse width of the main circuit power switching device, thereby changing the average value of the output voltage, so that the output voltage of the switching power supply remains stable. At present, the widely used control method in switching power supply is to sample the output voltage or current (the current flowing through the power switching device or output inductor), which forms two types of control methods: voltage control mode and current control mode. [0003] The peak current control strategy and the voltage control strategy are the mainstream PWM power supply control strategies. What is the fundamental difference between the two? The voltage type PWM means that the controller adjust...

Claims

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Application Information

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IPC IPC(8): H02M3/338H02M1/32H02M1/44
CPCH02M1/32H02M1/44H02M3/3381H02M3/3385H02M1/325Y02B70/10Y02P80/10
Inventor 郭启利刘湘王志燊
Owner MORNSUN GUANGZHOU SCI & TECH
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