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A three-level boost circuit and its control method

A technology of boost circuit and control method, applied in the direction of control/regulation system, electrical components, regulating electrical variables, etc., can solve the problems of voltage stress rise of switching tube or diode, diode breakdown, breakdown, etc., to ensure the working voltage Stress, the effect of avoiding breakdown

Active Publication Date: 2022-03-18
SHENZHEN KSTAR NEW ENERGY CO LTD
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  • Description
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AI Technical Summary

Problems solved by technology

[0002] In the three-level booster circuit of the prior art, when the output side of the booster circuit with multiple flying capacitors is connected in parallel to the same DC bus, after other channels have been powered on and the DC bus voltage has been established, if a certain A flying capacitor boost circuit has not been powered on, and the voltage on the flying capacitor and the input voltage are both zero. At this time, the bus voltage will all be added to the diode of this circuit, which may cause its diode to be broken down.
In addition, in the string photovoltaic inverter, the flying capacitor boost circuit will be connected to the first-stage grid-connected inverter circuit, and the bus voltage will rise rapidly when the power grid is high. The capacitor voltage is charged up, which may cause the voltage stress on the switch tube or diode to rise, causing its breakdown

Method used

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  • A three-level boost circuit and its control method
  • A three-level boost circuit and its control method
  • A three-level boost circuit and its control method

Examples

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Embodiment Construction

[0021] The preferred embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Flying over the capacitor C f The boost power conversion circuit 2 fly across the capacitor C in normal operation f The voltage should be the bus voltage V o Half of half, when switching tube s 1 When opening, switch tube s 2 Voltage stress is V cf When switching the tube S 2 When opening, switch tube s 1 The voltage stress is V o -V cf Therefore, the voltage stress of the switch tube is about half of the bus voltage, and the switching device with lower voltage stress; in order to avoid switching tube s 1 Or diode D 4 Voltage stress V o -V cf Up to rise, this example optimizes the design and optimization control of the three level boost circuit.

[0023] Such as figure 1 As shown, this example provides a three-level boost circuit, including: input capacitor C. in , Bypass branch 1, boost power conversion circuit 2, flying cross c...

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Abstract

The present invention provides a three-level boost circuit and its control method. The three-level boost circuit includes: an input capacitor, a bypass branch, a boost power conversion circuit, a flying capacitor, and a buck with a fixed ratio circuit and a DC bus capacitor, the input capacitor is respectively connected to the flying capacitor through the bypass branch and the boost power conversion circuit, and the fixed ratio capacitor is connected between the flying capacitor and the DC bus capacitor The step-down circuit further enables the voltage on the flying capacitor to follow the change of the bus voltage, and when the voltage value of the flying capacitor is less than the first threshold, the step-down circuit with fixed ratio is turned on to work. The invention solves the problem that the DC bus has power but the flying capacitor has no power or the voltage is too low, thereby ensuring the working voltage stress of the switch tube and the diode to avoid being broken down.

Description

Technical field [0001] The present invention relates to a boost circuit, and more particularly to a three-level boost circuit, and involves a control method of the three level boost circuit. Background technique [0002] In the prior art three-level boosting circuit, when there is a multi-channel flying over the capacitor boost circuit output side, when the other road has been powered, the DC bus voltage is established, while All the way flying across the capacitor boost circuit is still not powered up, the voltage and input voltage on the flying acceleration are zero, at which time the bus voltage will be added to the diode of the road, which may cause its diode to be broken. In addition, in the set-based photovoltaic inverter, the flying-crossing capacitor boost circuit will be connected to the first-stage grid-connected circuit, and the bus voltage will rise quickly when the power grid is pending, and if it is not possible to fly in time The capacitor voltage charges, which ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07H02M3/335H02M1/32
CPCH02M3/07H02M3/33576H02M1/32
Inventor 施科研邹莘剑杜成瑞刘程宇
Owner SHENZHEN KSTAR NEW ENERGY CO LTD
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