Control circuit, control method and harmonic converter

A control circuit and control method technology, applied in the direction of regulating electrical variables, control/regulating systems, high-efficiency power electronic conversion, etc., can solve the problems of asymmetric resonant current waveform, failure to start normally, over-current in the resonant cavity, etc., to simplify the design. effect of the process

Active Publication Date: 2019-07-09
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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Problems solved by technology

[0004] However, by controlling the voltage of the resonant capacitor to prevent overcurrent, it is necessary to adjust the fluctuation of the voltage of the resonant capacitor according to the specific application example. If the increase rate is too large, it will cause overcurrent in the resonant cavity; if the increase rate is too slow, the system startup time will be too long , affecting power performance
At the same time, since the transmiss

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  • Control circuit, control method and harmonic converter
  • Control circuit, control method and harmonic converter
  • Control circuit, control method and harmonic converter

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Embodiment Construction

[0049] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0050] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0051] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another eleme...

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Abstract

A control circuit, a control method and a harmonic converter are disclosed. A start control signal correspondingly changing with the duration of the soft start process is generated as a loop variable,the loop variable shows different change trends when the resonant current intensity is in different intervals, and thus, a resonant circuit can be started by controlling the converter. The change speed of the soft start loop variable is dynamically adjusted according to the actual current of the resonant circuit, so that the resonant circuit can be started quickly without causing over-current. Atthe same time, there is no need to make corresponding adjustment according to the application example, and the design process of the resonant circuit is simplified.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a control circuit, a control method and a resonant converter. Background technique [0002] Currently, the LLC (resonant circuit) topology is a relatively common circuit used in switching power supplies. When the LLC topology is started, since the initial voltage on the resonant capacitor is zero, a large instantaneous inrush current will be formed, which will easily cause the resonant circuit to over-current. [0003] One solution in the prior art is to use the resonant capacitor voltage as a control variable during the soft start process to control the resonant capacitor voltage fluctuation of the resonant circuit to gradually increase from low to high to prevent overcurrent. At the same time, a resonant current detection circuit and a protection circuit are configured. Once the resonant current of the resonant circuit is detected to be overcurrent, the corresponding...

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Application Information

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IPC IPC(8): H02M3/335H02M7/48H02M1/36
CPCH02M1/36H02M3/33569H02M7/48H02M7/4815Y02B70/10
Inventor 韩云龙
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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