Three-level power amplifier and hysteresis control method
A power amplifier, three-level technology, applied in power amplifiers, improving amplifiers to improve efficiency, etc., can solve the problems of inability to meet fast response requirements, complex control methods, slow response speed, etc., achieve simple and reliable control loops, and improve the overall performance. Efficient and responsive effects
Active Publication Date: 2018-03-13
安络杰医疗器械上海有限公司
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Problems solved by technology
However, the existing three-level power amplifier has a slow response speed and cannot meet the fast response requirements. At the same time, its control method is complicated and the efficiency is low.
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[0034] The present invention is described in further detail below in conjunction with accompanying drawing and concrete implementation example: this implementation example is carried out under the premise of technical solution of the present invention, has provided embodiment and operation process, but protection scope of the present invention is not limited to following Example.
[0035] Working principle: When the current given signal is greater than the current feedback signal, the switch tube Q1 is always on, and when the current feedback signal is greater than the current given signal, Q1 is turned off; when the current given signal plus the hysteresis signal is greater than the current feedback signal Q2 is always on when the current feedback signal is greater than the current given signal plus the hysteresis signal, Q2 is off. When both Q1 and Q2 are turned on, the current of the inductance coil rises. When both Q1 and Q2 are turned off, the current of the inductance co...
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The invention relates to a three-level power amplifier and a hysteresis loop control method, comprising a hysteresis loop comparison control circuit, a bridge circuit, and a drive circuit arranged between the hysteresis loop comparison control circuit and the bridge circuit, consisting of an operational amplifier and a comparator The hysteresis control circuit detects the load current through the current transformer to obtain the voltage value ui; the voltage follower detects the current given signal and outputs u1, and compares the voltage value ui with the voltage follower output u1 through the comparator COMP1 to obtain the field effect transistor Q1 Drive signal; the operational amplifiers OP2 and OP3 realize the proportional output u2 of the current given signal, and the voltage value ui is compared with u2 through the comparator COMP2 to obtain the drive signal of the field effect transistor Q2; the output of the comparator COMP1 and COMP2 is amplified by the drive circuit to generate a field effect Tubes Q1 and Q2 drive control signals, and by controlling Q1 and Q2 to be turned on and off, hysteresis control of the power amplifier is realized, which has the characteristics of simple and efficient, fast response, high efficiency, and low EMI interference.
Description
technical field [0001] The present invention relates to a three-level power amplifier and a control method, in particular to a three-level power amplifier capable of improving response time and response speed, and a three-level power amplifier capable of being simple and efficient, reducing loss and improving overall circuit efficiency, and hysteresis control method. Background technique [0002] With the development of power electronic devices and control technology, the use of modern power electronic technology to achieve power amplification is currently the most commonly used method. As a key component commonly used in various power supplies and instruments, it is usually required to have a fast dynamic response speed and a small The volume requires higher energy efficiency, and at the same time, the EMI interference should be small to prevent interference to surrounding products. Hysteresis control is by comparison tracking control, as a nonlinear bang-bang control meth...
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IPC IPC(8): H03F1/02H03F3/20
Inventor 何晓峰祁泽旺王晓玲
Owner 安络杰医疗器械上海有限公司