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A method and system for pfm-pwm hybrid control cllc resonant converter

A PFM-PWM, resonant converter technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve serious commutation losses, wide switching frequency range, and narrow zero-voltage switching of switching tubes and other issues, to achieve the effect of easy design and high work efficiency

Active Publication Date: 2022-06-17
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention proposes a method and system for PFM-PWM hybrid control of CLLC resonant converters, which solves the problems of wide pulse frequency modulation (PFM) switching frequency range, large circulating current power under light load, and difficult design of magnetic components.
At the same time, this method also effectively solves the problems of narrow zero-voltage switch (ZVS) of the switching tube in Pulse Width Modulation (PWM), large resonance current peak value under heavy load, and serious commutation loss.

Method used

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  • A method and system for pfm-pwm hybrid control cllc resonant converter

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Embodiment 1

[0029] The topology of bidirectional on-board chargers for electric vehicles is dominated by isolated bidirectional DC-DC converters. Among them, CLLC resonant converters are widely used in bidirectional electric vehicle chargers due to their high efficiency, simple control, and low secondary side output EMI. superior. figure 1 A block diagram showing the topology of the CLLC resonant converter used in the bidirectional on-board charger. The CLLC resonant converter topology can realize bidirectional operation, can realize soft switching in a higher switching frequency range, and improve system efficiency. Generally, pulse frequency modulation (PFM) is used in CLLC, figure 2 A block diagram of the structure of a conventional PFM-controlled CLLC resonant converter is shown. This method has simple control, high light-load efficiency, and can realize ZVS in a wide frequency range, but there are problems such as difficulty in transformer design and high light-load commutation po...

Embodiment 2

[0051] Figure 5 It is a structural block diagram of the system of the PFM-PWM hybrid control CLLC resonant converter proposed in this embodiment.

[0052] Please see attached Figure 5 , the PFM-PWM hybrid control CLLC resonant converter system includes:

[0053] PFM modulation module for collecting the output voltage V of the CLLC resonant converter o and output current I o , the output voltage V o and output current I o They are compared with the reference values ​​respectively, and then adjusted by their respective PI compensators and controlled by the constant current / constant voltage (CC / CV) charging circuit to obtain the PFM switching frequency control signal v f .

[0054] The PWM modulation module is used to convert the PFM switch control signal v f The PWM control signal v is obtained by a linear function calculation a .

[0055] Triangle carrier module for converting the PFM switching frequency control signal v f After the triangular wave carrier circuit, ...

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Abstract

The invention discloses a method and system for PFM-PWM hybrid control of a CLLC resonant converter. The method comprises: collecting the output voltage and output current of the CLLC resonant converter, comparing the output voltage and the output current with reference values ​​respectively, and then respectively After the respective PI compensator adjustment and constant current / constant voltage control circuit, the PFM switching frequency control signal is obtained; the PFM switching frequency control signal is calculated by a linear function to obtain the PWM control signal; the PFM switching frequency control signal is obtained after the triangular wave carrier circuit The triangular carrier signal of the set frequency; compare the PWM control signal with the triangular carrier signal to obtain the control signal, and then generate the driving signal of the CLLC resonant converter after passing through the driving circuit. The method can realize the zero-voltage turn-on of the switch tube in a wide input voltage and a wide load range, and has the characteristics of easy design of magnetic elements, high working efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of power electronic control, in particular to a method and a system for a PFM-PWM hybrid control CLLC resonant converter. Background technique [0002] The topology of bidirectional on-board chargers for electric vehicles is dominated by isolated bidirectional DC-DC converters. Among them, CLLC resonant converters are widely used in bidirectional on-board charging of electric vehicles due to their advantages of high efficiency, simple control, and low output EMI on the secondary side. on the device. [0003] Generally, a Pulse Frequency Modulation (PFM) method is used for control in a CLLC resonant converter. This method is simple to control, has high light-load efficiency, and can realize ZVS and other characteristics in a wide frequency range. However, the pulse frequency modulation (PFM) method has problems such as difficulty in transformer design and large commutation power at light load. SUMMARY OF T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02J7/00
CPCH02M3/33584H02J7/0068H02J2207/20Y02B70/10
Inventor 胡斯登朱浩旗陈朝锋
Owner ZHEJIANG UNIV