Two way DC converter controlled by one-end voltage stable, one-end current stable phase shift plus PWM and its control method

A bidirectional DC conversion and current-stabilizing technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, conversion equipment with intermediate conversion to AC, etc. It can solve the bidirectional free flow control of energy. A simple and reliable control strategy, reducing transformer utilization, narrowing the ZVS range, etc., to achieve excellent steady-state and dynamic characteristics, reduce circulating current losses, and improve efficiency.
CN1901345AInactive Publication Date: 2007-01-24NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Publication Date
2007-01-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

This invention relates to a 2-way DC convertor by phase shift of voltage regulation at one end and current stabilizing at the other plus PWM control and a control method, in which the 2-way DC converter includes a primary circuit, a switch control and a close-ring control, the primary circuit is composed of inductor L1, a switch tube S1 and serial branch 1, inductor L2, switch tube S2 and serial branch2, two auxiliary switch tubes Sa1 and Sa2, a clamp capacitor Cc and a composite branch 3, switch tubes S3 and S4 and serial branch 4, bleeder capacitor Ca and Cb, a serial branch 5 and an isolation transformer, the switch control circuit is composed of a phase shift control chip, a monostable trigger8 and a PWM control chip 9, the close ring control part is made up of a phase shift angle close ring control loop and a duty ratio close ring control loop, characterizing that: 1, suppressing the voltage peak of the tube, 2, reducing the circumfluence loss of the converter to guarantee the soft switch in the total load sphere, 3, the uncoupling control of the phase shift angle and the duty ratio realizes 2-way free flow of energies.
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Description

1. Technical field

[0001] The one-end voltage-stabilizing and one-end steady-flow type phase-shift plus PWM control bidirectional DC converter and its control method of the present invention belong to a bidirectional DC-DC converter and a control method for bidirectional free flow of energy. 2. Technical background

[0002] In a typical uninterruptible power supply system, a battery is used as an energy storage element. When the external power supply is normal, the battery is charged by the external power supply. Once the external power supply is abnormal, the battery provides electric energy. In the aircraft high-voltage DC power supply system, when the main power supply (270VDC) is normal, the main power supply charges the battery (28V) through the bidirectional DC-DC converter, and supplies power to the 28V important load. The DC converter supplies the 270V critical load. In the above-mentioned application occasions, high-low voltage conversion is involved, and electrica...

Claims

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