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Three-phase LLC resonant converter with ultra-wide voltage regulation range

A technology of resonant converter and voltage regulation range, which is applied in the direction of adjusting electrical variable, output power conversion device, converting DC power input to DC power output, etc., can solve the problem that single-phase LLC resonant converter is difficult to meet high power index output Ripple index, power density index, it is difficult to meet the output voltage range index, standby power loss and high efficiency index, etc., to achieve the effect of ultra-wide input voltage and output voltage adjustment range, low loss and high efficiency

Pending Publication Date: 2022-07-26
杨玉岗
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Because the LLC resonant converter has soft switching characteristics to achieve high efficiency, the main circuit topology of the current charging module usually adopts the LLC resonant converter technology, but it is difficult to meet the high power index, ultra-small The output ripple index and super large power density index, but relying on the traditional three-phase LLC resonant converter, it is difficult to meet the ultra-wide output voltage range index, ultra-small standby power loss and high efficiency index in the full load range

Method used

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  • Three-phase LLC resonant converter with ultra-wide voltage regulation range
  • Three-phase LLC resonant converter with ultra-wide voltage regulation range
  • Three-phase LLC resonant converter with ultra-wide voltage regulation range

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Effect test

Embodiment 1

[0034] Refer to the attached figure 1 , a three-phase LLC resonant converter with an ultra-wide voltage regulation range, characterized in that it includes a DC input power supply V in , seven power switch tubes Q 1 ~Q 7 and its body diode D 1 ~D 7 and parasitic capacitance C 1 ~C 7 , the three resonant inductors L r1 , L r2 , L r3 , the three resonant capacitors C r1 , C r2 , C r3 , three resonant transformers T with a turns ratio of n 1 , T 2 , T 3 , and respectively in parallel with the resonant transformer T 1 , T 2 , T 3 The equivalent magnetizing inductance L at both ends of the primary winding m1 , L m2 , L m3 , twelve rectifier diodes D 8 ~D 19 and the output filter capacitor C o ; The seven power switch tubes Q 1 ~Q 7 The three-phase fully-controlled bridge inverter circuit constituting the three-phase LLC resonant converter is taken as an example that the power switch tubes are all power MOSFETs, and the power switch tubes Q 1 The source and ...

Embodiment 2

[0036] Refer to the attached figure 2 , 3 , 4, 14, a three-phase LLC resonant converter with an ultra-wide voltage regulation range, characterized in that: keeping the switching tube Q 6 Continuous conduction, switch Q 1 , Q 3 , Q 4 , Q 7 Continuously off, the switch Q 2 and Q 5 Complementary conduction and work in the FM state, the switch Q 2 , Q 5There is a dead time for the driving signal of the transformer, which not only prevents the shoot-through phenomenon, but also realizes soft switching; the transformer T 1 and T 3 does not work, transformer T 2 work, the other end C of its primary winding is directly connected to the power supply V in The negative pole of the three-phase resonant tank, only the second-phase resonant tank works, and the input voltage at both ends B and C of the second-phase resonant tank is 0~V in The square wave constitutes a single-phase half-bridge LLC resonant converter topology 1, and the voltage gain of the LLC resonant converter t...

Embodiment 3

[0038] Refer to the attached Figure 5 , 6 , 7, 14, a three-phase LLC resonant converter with an ultra-wide voltage regulation range, characterized in that: keeping the switching tube Q 1 , Q 6 Continuous conduction, switch Q 3 , Q 4 , Q 7 Continuously disconnected, the switch tube Q 2 , Q 5 Complementary conduction and work in the frequency modulation state, the switch Q 2 , Q 5 There is a dead time for the driving signal of the first phase, which not only prevents the shoot-through phenomenon, but also realizes soft switching; the A terminal of the first phase resonance tank is directly connected to the power supply V in The positive pole of the third phase resonant tank is directly connected to the power supply V in The negative pole of the first-phase resonant tank and the second-phase resonant tank work, and the third-phase resonant tank does not work, forming a half-bridge LLC resonant converter topology 2 with two-phase input terminals in parallel and output te...

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Abstract

The invention provides a three-phase LLC resonant converter with an ultra-wide voltage regulation range. The three-phase LLC resonant converter comprises a direct-current input power supply, seven power switch tubes, three resonant inductors, three resonant capacitors, three transformers, three equivalent excitation inductors of the transformers, twelve rectifier diodes and an output filter capacitor. The seven power switch tubes form a three-phase bridge inverter circuit; the three resonant inductors, the resonant capacitor and the excitation inductor form a three-phase resonant tank which are in triangular connection; and three secondary windings of the three transformers are respectively connected with three H-bridge rectifiers which are connected in series and are formed by twelve diodes, and then are connected with an output filter capacitor and a load in parallel. The three-phase LLC resonant converter has the beneficial effects that the three-phase LLC resonant converter has the advantages of high power, high efficiency, narrow working frequency range, ultra-wide output voltage range, ultra-small output current ripple, ultra-small standby loss power and the like, and is widely applied to electric vehicle charging piles and other charging power supplies needing high power and ultra-wide output voltage range.

Description

technical field [0001] The patent relates to a three-phase LLC resonant converter with an ultra-wide voltage regulation range, belonging to the technical field of power electronics. Background technique [0002] The rapid development of the automobile industry has exacerbated the energy crisis and environmental pollution. The emergence of electric vehicles in recent years has alleviated this situation. Among them, high-power fast charging systems have become an important research direction for the electric vehicle industry. However, since the charging requirements of various electric vehicle manufacturers are not uniform, a large number of charging equipment entering the grid will also bring new impacts to the power grid. Therefore, the charging equipment for electric vehicles has high power, wide range, high efficiency and high power factor. This is also one of the bottlenecks for the large-scale popularization of electric vehicles. The research on electric vehicle charging...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M7/5387H02M1/14
CPCH02M3/33569H02M7/53875H02M1/14
Inventor 杨玉岗孙晓钰
Owner 杨玉岗
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