Automatic current equalizing method and device of vibrostand power amplifier

An automatic and powerful technology, applied in the direction of measuring device, vibration test, machine/structural component test, etc., can solve the problems of increasing the construction amount of commissioning personnel and failing to achieve the effect of current equalization, so as to reduce the difficulty of construction and achieve stable, accurate and uniform flow effect

CN101750199AActive Publication Date: 2010-06-23SUZHOU DONGLING VIBRATION TEST INSTR
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2010-06-23

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Abstract

The invention relates to an automatic current equalizing method and device of vibrostand power amplifier. The technical scheme of the invention includes the steps: a digital modulating module and a power amplifying unit are arranged in a control instrument unit; a plurality of current sampling circuits are arranged in the power amplifying unit which are respectively used for detecting the branch circuits outputted by each power amplifying module in the power amplifying unit, and feeding the signals of the branch circuits back to the corresponding power amplifying modules; the power amplifyingunit feeds back a general current signal back to the digital modulating module which works out an average current signal according to the general current signal, and simultaneously receives and implements PWM digital modulation on the output signal of the control instrument unit, and then sends the signal and average current signal after PWM digital modulation to each power amplifying module; each power amplifying module compares the average current signal and the branch current signals, and adjusts the PWM waveform output of each power amplifying module. The invention has simple method and easy device, can greatly reduce the difficulty of debugging construction, as well as stably and precisely realizes the current equalizing of each power amplifying module in the power amplifying unit.
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Description

technical field

[0001] The invention specifically relates to an automatic current sharing method and device for a vibrating table power amplifier in the technical field of vibration testing. Background technique

[0002] In the field of vibration test technology, due to the need for high-power loads, the requirements for the output current of the power amplifier of the shaking table are also increasing. However, due to the influence of the semiconductor power devices and magnetic materials that constitute the power amplifier module of the shaking table The output parameters of the module (such as voltage, current, power) often cannot meet the requirements. In this case, multiple power amplifier modules are generally used in parallel to supply power, which can not only provide the required current, but also form an N+m redundant structure, which improves the stability of the system, which can be said to kill two birds with one stone. However, when the power amplifier modules...

Examples

Embodiment Construction

[0024] Such as figure 1 As shown, the automatic current sharing device for the power amplifier of the vibrating table includes a digital modulation module 1, the input end of the digital modulation module 1 is connected to a controller unit 9, and its output end is connected to the input end of a power amplifier unit through a communication bus 3. The power amplifier unit includes a plurality of power amplifier modules 4 arranged in parallel and a plurality of current sampling circuits 5 respectively correspondingly connected to each power amplifier module 4, and a branch current feedback loop 6 is also set between each current sampling circuit and the corresponding power amplifier modules, The output end of the power amplifier unit is connected to a vibrating table body, and the vibrating table body 8 is connected to the digital modulation module 1 through a total current feedback loop 2 .

[0025] The working process of the automatic current sharing device for the power ampl...