PWM control method, control circuit and inverter of five-level inverter circuit
A technology of inverter circuit and control method, which is applied in the direction of logic circuit with logic function, electrical components, output power conversion device, etc., and can solve problems such as short circuit of DC capacitor
Active Publication Date: 2019-08-13
SUNGROW POWER SUPPLY CO LTD
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[0005] The present invention provides a PWM control method, a control circuit and an inverter of a five-level inverter circuit, so as to solve the problem that the DC capacitor is short-circuited in the five-level inverter circuit in the prior art
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[0070] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0071] The invention provides a PWM control method of a five-level inverter circuit to solve the problem that the DC capacitor is short-circuited in the five-level inverter circuit in the prior art.
[0072] Specifically, the PWM control method is applied to a five-level inverter circuit, such as figure 2 As shown, the five-level inverter circuit includes: a first capacitor C1, a second capacitor C2, a third capacitor C3 and eight switch branches (10-80).
[0073] Specifically, the series branch of the first capacitor C1 and the second capacitor C2 is connected in parallel between the output positive terminal PV+ and the output negative terminal PV- of the DC power supply.
[0074] The first switching branch 10 is connected in series...
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The PWM control method of the five-level inverter circuit provided by the present invention is applied to the five-level inverter circuit, and the five-level inverter circuit includes a first capacitor, a second capacitor, a third capacitor and eight switch branches, In the control method, the control logic is set so that the first switch branch and the fourth switch branch are complementary to conduction, the second switch branch and the fifth switch branch are complementary to conduction, and the third switch branch and the sixth switch branch Complementary conduction, the seventh switch branch and the eighth switch branch are complementary conduction, and the first switch branch and the second switch branch are interlocked, and the sixth switch branch and the fifth switch branch are interlocked. The interlocking makes the five-level inverter circuit work in a steady state. At this time, the first capacitor, the second capacitor and the third capacitor will not have the problem of capacitor short circuit due to simultaneous conduction of some switch branches.
Description
technical field [0001] The invention relates to the technical field of new photovoltaic energy sources, in particular to a PWM control method for a five-level inverter circuit, a control circuit and an inverter. Background technique [0002] In recent years, multi-level output has become a common technology in the field of medium-high voltage and high-power frequency conversion. Among them, the active neutral point clamping multi-level circuit is a commonly used multi-level inverter circuit, which sets at least one floating capacitor at a certain position of the circuit, so that its level is clamped to form different level output . [0003] Commonly used five-level inverter circuits such as figure 1 As shown, it includes a plurality of switching tubes and freewheeling diodes, wherein the multiple switching tubes are turned on and off according to a preset logic, thereby realizing the inverter function. However, since the five-level inverter circuit includes three DC capac...
Claims
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IPC IPC(8): H02M7/483H02M1/38
CPCH02M1/38H02M7/483H02M1/08H02M7/487H02M7/5395H03K7/08H03K19/20H02M1/0095H02M7/4837
Inventor 陈鹏曹金虎耿后来文鹏
Owner SUNGROW POWER SUPPLY CO LTD