A pwm modulation method for h-bridge inverter power supply to eliminate odd switching harmonics
A technology of inverter power supply and modulation method, which is applied to electrical components, output power conversion devices, and AC power input into DC power output, etc. Small computing performance requirements, reduced capacity and volume, and the effect of reducing high-frequency electromagnetic vibration and noise
Active Publication Date: 2022-04-12
NO 719 RES INST CHINA SHIPBUILDING IND
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the problems of H-bridge type inverter power supply digital sampling unipolar frequency multiplication modulation performance weakening, digital controller processing capability limitation, etc.
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[0028] The present invention will be further described below with reference to the accompanying drawings and specific examples.
[0029] Such as figure 1 As shown, the PWM modulation method of the elimination odd-numbered switching frequency harmonic is applied to the three-phase combined H bridge type inverter power supply, and the main circuit includes: 1, three separate A (BC) phase H bridged Inverter circuit; 2, three-phase AC filter circuit; 3, three-phase voltage and current sensor group for measuring each phase inductor current I L And capacitor voltage u C 4, three-phase independent PWM drive signals.
[0030] Each phase H bridge inverter circuit includes: first switching tube S 1 , Second switch tube S 2 Third switching tube s 3 , Fourth switch tube S 4 The first switching tube S 1 , Second switch tube S 2 After connecting each other, form a superior bridge arm, the third switch tube S 3 And the fourth switch tube S 4 The complementary bridge arm is formed in series with ...
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The invention discloses a PWM modulation method for an H-bridge inverter power supply for eliminating odd-numbered switching frequency harmonics. The H-bridge inverter power supply includes a three-phase combined H-bridge inverter circuit, and each phase of the H-bridge inverter Transformation circuit includes: first switch tube S 1 , the second switch tube S 2 , the third switch tube S 3 , the fourth switch tube S 4 , the first switching tube S 1 , the second switch tube S 2 After being connected in series with each other to form a leading bridge arm, the third switching tube S 3 and the fourth switching tube S 4 Connected in series with each other to form complementary bridge arms. The invention can realize the suppression of odd-number switching frequency harmonics caused by digital symmetrical regular sampling. The PWM modulation method proposed by the present invention can achieve the purpose of updating the duty cycle signal twice in a single carrier period without increasing the control frequency of the controller to perform multiple sampling, and reduces the requirement for real-time calculation of the control system. Under the same control frequency, the high-frequency electromagnetic vibration and noise of the equipment can be reduced, and the volume and capacity of the output filter can be reduced.
Description
Technical field [0001] The present invention relates to the field of power electron converter control, and more particularly to a H-bridge type DC-AC inverter power supply PWM pulse width modulation method. Background technique [0002] Inverter power supply as a DC-AC power conversion device, is a key interface for connecting DC power supplies and public AC grids or loads. With the increase of energy demand and the development of power technology, high-power, high-performance inverter power supply is widely used in various power systems. Due to the limit of high-power switching devices, the switching frequency is limited, and its control performance will also be greatly restricted. Advanced pulse width modulation modulation such as carrier phase movement, single polarity frequency, can improve the equivalent switching frequency of the power electron converter, and improve the quality of the output electrical energy. [0003] For the H-bridge type inverter power supply, the natur...
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IPC IPC(8): H02M7/5395H02M1/12H02M7/5387H02M1/44
CPCH02M7/5395H02M1/12H02M7/53871H02M1/44
Inventor 吴钫魏华郑中祥李保群吴大立姜波陈涛罗伟耿攀蔡凯李锐吴浩伟孔祥伟李小谦李可维李鹏蔡久青汪文涛邓磊金翔张鹏程张炜龙张正卿
Owner NO 719 RES INST CHINA SHIPBUILDING IND