Soft Switching Power Amplifier
A technology of power amplifier and soft switch, which is applied in the direction of output power conversion device, instrument, DC power input conversion to DC power output, etc., which can solve the problem of inability to ensure the operation of the circuit resonance mode and the voltage stress of anti-parallel diodes Large, unable to meet the application requirements and other problems, to achieve the effects of reducing ripple and voltage stress, fast dynamic response, and high current control accuracy
Active Publication Date: 2019-12-31
HARBIN INST OF TECH
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Problems solved by technology
[0004] Due to the use of passive soft switching, its disadvantages are mainly that the ZCS (Zero Current Switch) / ZVS (Zero Voltage Switch) conditions are related to changes in switching frequency and load. When the switching frequency ( When factors such as load) change, the operation of the resonant mode of the circuit cannot be well guaranteed; the voltage stress of the anti-parallel diode in the main circuit is large, and the two low-frequency tubes are still in the state of hard switching
Especially when the circuit is applied to precise motion control, switching between the two low-frequency tubes when the output current crosses zero will result in distortion of the output current zero crossing, so the output current ripple after increasing the switching frequency is still very large, which cannot meet the requirements. application requirements
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[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0023] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.
[0025] A soft-switching power amplifier, comprising: a DC power supply unit, an inverter circuit, a resonant net...
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The invention discloses a soft switch power amplifier, which belongs to the field of motor drive control. The soft-switching power amplifier includes: a DC power supply unit, an inverter circuit, a resonance network and a filter network; the resonance network is connected between the power supply end of the DC power supply unit and the output end of the inverter circuit; the inverter circuit is used to The direct current output by the direct current power supply unit is converted into alternating current and delivered to the load through the filtering network. Because the semiconductor switching device of the power amplifier works in the soft switching state, the invention has the characteristics of high current control precision, fast dynamic response, high efficiency, low noise and the like.
Description
technical field [0001] The invention belongs to the field of motor drive control, in particular to a soft-switching power amplifier. Background technique [0002] PWM (Pulse Width Modulation, pulse width modulation) hard-switching power amplifier is widely used in servo drive systems because of its low cost and simple control. With the increase of the power level of the driver, its hard switching characteristics lead to large switching loss of the power amplifier and severe heat generation, which reduces the reliability and life of the system, especially in some high-precision occasions, increasing the switching frequency to speed up the response speed of the system And increasing the current control accuracy is very necessary. Due to the limitation of switching loss, hard switching is difficult to achieve high frequency of the driver. Therefore, in order to improve system efficiency and switching frequency, soft switching power amplifiers have appeared. [0003] Existing ...
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IPC IPC(8): H02M7/537H02M1/12H02M3/158
CPCH02M1/126H02M3/1584H02M7/537H02M7/4818Y02B70/10
Inventor 寇宝泉韦坚张海林
Owner HARBIN INST OF TECH