Cascaded operation power semiconductor device voltage balancing device and method thereof
A power semiconductor and voltage equalization technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problems that threaten the safe operation of series devices, cannot guarantee the stable response of the control loop, and multiple oscillations
Active Publication Date: 2020-08-11
ZHEJIANG UNIV
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Problems solved by technology
However, the current technology cannot guarantee the fast and stable response of the entire control loop. Unbalanced voltage over-adjustment and multiple oscillations may occur during the voltage equalization adjustment process, which threatens the safe operation of series devices and is limited in practical applications.
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[0034] In order to describe the present invention in more detail, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0035] Such as figure 1 As shown, the present invention provides a cascaded operation power semiconductor device voltage equalization device, which includes: N cascade operation power semiconductor devices, N turn-off voltage sampling units, voltage equalization calculation units, and N switching signal phases Compensation unit, N is a positive integer greater than or equal to 2. The power semiconductor device in the present invention may be an insulated gate bipolar transistor (IGBT) or a metal-oxide semiconductor field effect transistor (SiC MOSFET).
[0036] The specific functions of each unit are as follows:
[0037] The N turn-off voltage sampling units are connected to the N power semiconductor devices in one-to-one correspondence, and each turn-off voltage sa...
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The invention discloses a cascaded operation power semiconductor device voltage balancing device and method and belongs to the technical field of power electronic conversion. The power semiconductor switch comprises N cascaded power semiconductor devices, N turn-off voltage sampling units, a voltage equalization calculation unit and N switching signal phase compensation units and is suitable for voltage equalization under cascaded operation of the power semiconductor devices, and expanding a working voltage of the power semiconductor switch. The power semiconductor switch is advantaged in thatswitching signal compensation phases are generated by detecting a voltage at two ends of the cascade devices and added to driving signals, and voltage distribution of the cascade device is actively adjusted. The invention provides a switching signal phase difference generation method and a corresponding support parameter test method, which are used for ensuring stable and high-speed operation ofa control loop.
Description
Technical field [0001] The invention belongs to the technical field of power electronics, and specifically relates to a power semiconductor device cascaded operating voltage equalization device and a method thereof. Background technique [0002] As the power capacity of power electronic converters increases, voltage increases are an inevitable trend. However, the single tube capacity and voltage level of the existing power semiconductor devices cannot meet the equipment requirements. In order to make up for the insufficient voltage resistance of power semiconductor devices, cascaded operation of power semiconductor devices is the most direct solution, which plays a role in voltage expansion. The advantages of cascaded operation of low-voltage power semiconductor devices include low switching loss and low cost. Realizing the cascaded operation of low-voltage power semiconductor devices is of great significance for improving the performance of power electronic devices. [0003] Th...
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IPC IPC(8): H02M1/08H02M1/32H02M1/34
CPCH02M1/08H02M1/32H02M1/34H02M1/007
Inventor 李武华李成敏王宇翔罗皓泽杨贺雅李楚杉何湘宁
Owner ZHEJIANG UNIV