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Tri-level switch power amplifier

A switching power and amplifier technology, applied in the field of three-level switching power amplifier, can solve the problems of limited dynamic characteristics, large current ripple, low reliability, etc. Effect

Inactive Publication Date: 2006-07-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0002] The early voltage-current power amplifier was a linear power amplifier. Due to its large power loss and low efficiency, a two-level switching power amplifier was used later. However, the two-level power amplifier has the disadvantages of large current ripple and limited dynamic characteristics.
In recent years, scholars have proposed three-level modulation technology. Digital three-level switching power amplifiers mostly use DSP, CPLD or FPGA chips as the main control circuit, and some also add A / D modules, which are more expensive and require Considering the interference of digital and analog signals, the reliability is not high; the analog three-level switching power amplifier uses mature pulse width modulation technology, which has high reliability and low cost, and is suitable for industrial applications

Method used

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Embodiment Construction

[0022] Taking the unipolar power amplifier controlling the load current of two coils as an example, the principles of the bipolar power amplifier and the unipolar power amplifier are mostly the same, and the differences are explained separately.

[0023] The circuit principle of unipolar power amplifier is as follows: figure 1 as shown, figure 1 Chinese symbol names: Q1, Q3 are switching tubes, D2, D4 are power diodes. It mainly includes signal mixing processing circuit, pulse width modulation circuit, protection circuit, optocoupler isolation drive circuit and bridge circuit. Signal mixing processing circuit such as figure 2 As shown, since the PID signal needs to control the upper and lower differential coil loads with one degree of freedom respectively, one of the PID signals is passed through the operational amplifier U 1C reverse. -5V is the bias voltage required to provide quiescent current, the PID signal through the resistor R4, the resistor R 6 The -5V bias volt...

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Abstract

This invention relates to three-level switch power amplifier belonging to voltage to current switch power amplifier, which comprises Signal mixture process circuit, impulse modulation circuit, protective and light coupling drive circuit and the voltage signal drive bridge circuit to control the signal to get relative voltage signals to control the load current size. The double electrode power amplifier without bias current has wide application prospect.

Description

1. Technical field [0001] The three-level switching power amplifier of the invention belongs to the voltage-current type switching power amplifier. 2. Background technology [0002] The early voltage-current power amplifier was a linear power amplifier. Due to its large power loss and low efficiency, a two-level switching power amplifier was used later. However, the two-level power amplifier has the disadvantages of large current ripple and limited dynamic characteristics. . In recent years, scholars have proposed three-level modulation technology. Digital three-level switching power amplifiers mostly use DSP, CPLD or FPGA chips as the main control circuit, and some also add A / D modules, which are more expensive and require Considering the interference of digital and analog signals, the reliability is not high; the analog three-level switching power amplifier uses mature pulse width modulation technology, has high reliability and low cost, and is suitable for industrial app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/217
Inventor 徐龙祥王军
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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