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Resonant converter

A technology of resonant converters and transformers, which is applied in instruments, converting DC power input to DC power output, and adjusting electrical variables, etc. It can solve the problems of reducing the overall efficiency of the power supply and the inability of the converter to achieve the ideal working state of the reactive power of the resonant cavity. , to achieve the effect of improving work safety

Inactive Publication Date: 2017-05-10
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If you need to adjust the output voltage to meet different load requirements, you can only adjust the frequency or pulse width or amplitude modulation. After frequency modulation or pulse width modulation, the converter cannot reach the ideal working state where the reactive power of the resonant cavity tends to zero.
Amplitude modulation requires an additional level of amplitude modulation power supply, reducing the overall efficiency of the power supply

Method used

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Examples

Experimental program
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Embodiment 1

[0024] figure 2 A schematic structural diagram of a resonant converter provided in Embodiment 1 of the present invention, as shown in figure 2 As shown, the resonant converter includes: a rectification and filtering module 210 and an inverter control module 220, and also includes at least two inverter modules 230 and a transformer 240;

[0025] The transformer 240 includes at least two primary side windings and one secondary side winding, and the at least two primary side windings are respectively connected to the output ends of at least two inverter modules 230;

[0026] At least two inverter modules 230, the input ends of which are connected in parallel with a DC power supply, are used to invert the input DC power into a square wave AC power through the inverter bridge 231, and then output it through the resonant cavity 232;

[0027] The input terminal of the rectification and filtering module 210 is connected to the secondary winding of the transformer 240, and is used t...

Embodiment 2

[0032] On the basis of the above technical solution, optionally, at least two inverter modules 230 have the same specification.

[0033] Further, the inverter control module 220 is specifically configured to control the inverter bridges 231 in the at least two inverter modules 230 to output square-wave alternating current with equal frequency and duty cycle by outputting drive signals to at least two inverter modules 230 .

[0034] Further, the inverter control module 220 is specifically configured to control the frequency of the square-wave alternating current output by the inverter bridge 231 in the at least two inverter modules 230 to be the frequency of the resonant cavity 232 through the drive signals output to the at least two inverter modules 230. The resonant frequency of the square wave AC has a duty cycle of 50%.

[0035] Among them, when the frequency of the square wave alternating current is equal to the resonant frequency of the resonant cavity, on the one hand, ...

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PUM

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Abstract

An embodiment of the invention discloses a resonant converter. The resonant converter comprises a rectification filtering module and an inversion control module, and further comprises at least two inversion modules and a transformer, wherein the transformer comprises at least two primary side windings and a secondary side winding; the at least two primary side windings are connected with the output ends of the at least two inversion modules; the input ends of the at least two inversion modules are connected in parallel with a direct-current power supply and used for inverting an input direct current into a square wave alternating current through an inversion bridge and outputting the square wave alternating current through a resonant cavity; the input end of the rectification filtering module is connected with the secondary winding of the transformer and used for converting an alternating current output by the secondary winding of the transformer into a direct current and outputting the direct current to a load; and the inversion control module is connected with the at least two inversion modules and used for sending a driving signal to the at least two inversion modules and controlling the square wave alternating current generated by the inversion bridge. According to the technical scheme provided by the resonant converter, reactive power of the resonant cavity of the converter all tends to zero in a whole range, and system response is quick.

Description

technical field [0001] Embodiments of the present invention relate to power electronics technology, and in particular to a resonant converter. Background technique [0002] An LC resonant circuit is added to the traditional DC-DC and DC-AC switching converters to make the voltage across the switch tube and the current flowing through it periodically oscillate and change, providing zero-current and / or zero-voltage switching for the switch tube. Such a converter is called a resonant converter. [0003] Such as figure 1 As shown, a typical resonant converter structure in the prior art includes a rectification and filtering module 110 , an inverter module 120 , a transformer 130 and an inverter control module 140 . A typical structure of an inverter module may include an inverter bridge 121 and an LC resonant cavity 122 . The resonant converter is connected between an incoming DC source and a load. The inverter bridge 121 converts the input DC power into a square-wave AC vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/38
CPCH02M1/38H02M3/335H02M1/0058H02M1/0067Y02B70/10
Inventor 陈青昌吴景林
Owner SHANGHAI UNITED IMAGING HEALTHCARE