Control system of phase shift voltage regulation circuit and control method thereof
A voltage regulation circuit and control method technology, applied in electrical components, output power conversion devices, AC power input conversion into DC power output and other directions, can solve problems such as failure to ensure stable output voltage recovery, load overvoltage damage, etc. The effect of ensuring no risk of overvoltage shock and reducing economic losses
Pending Publication Date: 2022-04-22
天津美炫电气自动化科技有限公司
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Problems solved by technology
[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a control system and control method for a phase-shift voltage regulation circuit. This invention can effectively solve the problem of the phase-shift voltage regulation circuit The technical problem that the output voltage cannot be guaranteed to recover smoothly, and the load is easily damaged by overvoltage
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[0057] Such as Figure 4 As shown, the control system of the phase-shift voltage regulation circuit includes: power frequency power input, thyristor rectifier circuit, output filter circuit, thyristor trigger circuit, zero-crossing detection circuit, voltage feedback circuit, digital PID adjustment circuit.
[0058] The industrial frequency power supply input module is connected with the industrial frequency power supply to input the industrial frequency power supply; the thyristor trigger circuit is connected with the thyristor rectifier circuit, and sends a trigger signal to the thyristor element to realize DC voltage output; the output filter circuit is used to filter the output Voltage harmonics to improve the quality of the output voltage; the zero-crossing detection circuit is used to calculate the upper and lower limits of the effective zero-crossing signal period, judge whether the zero-crossing detection signal is an effective zero-crossing detection, and transmit the ...
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The invention belongs to the technical field of voltage regulation automatic control, and relates to a control system and a control method of a phase shift voltage regulation circuit, the system comprises a power frequency power supply input module, a silicon controlled rectifier circuit, an output filter circuit, a silicon controlled rectifier trigger circuit, a zero cross detection circuit, a voltage feedback circuit and a digital PID regulation circuit; according to the control system and the control method, when the power frequency voltage is instantaneously abnormal, the correctness of a zero-crossing signal is detected and judged, and zero crossing is ensured to be synchronous with an actual power frequency voltage zero-crossing point; and according to the feedback real-time voltage, the phase shift adjustment value output by the PID is re-corrected, so that the output voltage is stably recovered from the current feedback value to the set value. Compared with the prior art, it is ensured that no overvoltage impact risk exists on the load, and economic losses are reduced.
Description
technical field [0001] The invention belongs to the technical field of voltage regulation automatic control, and in particular relates to a control system and a control method of a phase-shift voltage regulation circuit. Background technique [0002] The existing control method of the phase-shifting voltage regulating circuit cannot ensure the stable recovery of the output voltage when the power frequency input voltage is abnormal instantaneously, and it is very easy to cause the load to be damaged by overvoltage. [0003] Such as figure 1 As shown, when the zero-crossing detection is synchronized with the zero-crossing point of the power frequency voltage, the phase-shift trigger is normal and the output voltage is stable; [0004] When the input power connection is poor or the power supply is unstable, transient voltage abnormalities will occur, such as figure 2 Middle T 1 to T 2 At this time, the zero-crossing detection and the actual power frequency voltage zero-cro...
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IPC IPC(8): H02M7/155H02M1/32H02M1/06
CPCH02M7/1557H02M1/32H02M1/06
Inventor 张志中
Owner 天津美炫电气自动化科技有限公司