Mains-based switching power amplifier circuit
A power amplifier circuit and switch technology, which is applied in the field of power amplifiers, can solve the problems of bulky transformers and many turns of transformer coils, and achieve the effect of reducing complexity and high efficiency
Active Publication Date: 2016-03-16
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology
[0005] It can be seen from the above that since the transformer directly steps down the mains power to the low voltage required by the switching power amplifier circuit, and the frequency of the mains power is usually 50HZ or 60HZ, working at such a low frequency results in a large number of coil turns in the transformer. Makes the transformer relatively bulky, therefore, it is necessary to improve the existing switching power amplifier circuit
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[0040] The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.
[0041] see Figure 2 to Figure 4 . It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the present invention. Limiting conditions, so there is no technical substantive meaning, any modification of structure, change of proportional relationship or adjustment of size, without affecting the effect and purpose of the present invention, should still fall within the scope of the present invention. The disclosed technical content must be within the scope covered. At the sa...
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The invention provides a switching power amplifier circuit based on commercial power. The switching power amplifier circuit at least comprises a rectification circuit rectifying the commercial power to direct current, a common mode level providing circuit used for providing a required common mode level based on the direct current, a PWM (pulse-width modulation) waveform generation circuit used for providing a forward pulse-width signal and a reverse pulse-width signal which are corresponding mutually based on the direct current and the common mode level, a switching signal generation circuit used for generating two switching signals based on the common mode level, the forward pulse-width signal and the reverse pulse-width signal, and two voltage transformation circuits provided with controlled switches respectively, wherein each controlled switch of each voltage transformation circuit is connected into one switching signal; and the controlled switches provide electric energy in corresponding directions to a load based on the respective switching signals and the direct current to drive the load. The circuit integrates voltage transformation and switching power amplifiers, and is very simple in system structure; and with the adoption of the switching power amplifier circuit, the efficiency is high.
Description
technical field [0001] The invention relates to the field of power amplifiers, in particular to a switching power amplifier circuit based on commercial power. Background technique [0002] A switching power amplifier is a high-efficiency power amplifier, and under ideal conditions, it can achieve 100% efficiency. In such a power amplifier, the magnitude of the drive voltage is strong enough (overdrive) that the output transistor is equivalent to a controlled switch that rapidly transitions between fully on (transistor operating in the linear region) and fully off (transistor operating in the cutoff region) Switching, because the current waveform flowing through the ideal switch and the voltage waveform on the switch do not overlap, the ideal switch does not consume power consumption, and all the DC power consumption provided by the power supply is converted into output power, thereby achieving 100% efficiency. However, due to factors such as power consumption in the state t...
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IPC IPC(8): H02M5/458
Inventor 金荣陈后鹏许伟义王倩宋志棠
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI