High-voltage alternating-current chopping sampling circuit, regulation and control method and device

Abstract

The invention discloses a high-voltage alternating-current chopping sampling circuit, a regulation and control method and a device. The circuit comprises an input filtering module, a current-limiting switching module, a pulse width modulation module and a low-pass filtering module, the input filtering module is used for rectifying and filtering input voltage; the current-limiting switching module is used for switching and matching different input voltages and carrying out current-limiting processing on the filtering voltage output by the input filtering module; the pulse width modulation module is used for carrying out reverse-phase shaping processing on the current-limiting voltage output by the current-limiting switching module; and the low-pass filtering module is used for performing low-pass filtering processing on the in-phase voltage output by the pulse width modulation module. Different working voltages are switched and adjusted through the current-limiting switching circuit so as to adapt to different loads, different load types are adjusted through the pulse width modulation circuit, and under the condition that the circuit is simplified, the regulation and control difficulty is reduced, and the stability and the anti-interference capability of the output voltage are improved.

Description

technical field [0001] The invention relates to the technical field of sampling circuits, in particular to a high-voltage AC chopper sampling circuit, a control method and a device. Background technique [0002] With the development of electronic technology, more and more different electronic devices and electronic products are released on the market for public use. One of the common electronic devices is LED lights. Due to the tightness and shock resistance of LED lights, and the ability to directly emit red, yellow, blue, green, blue, orange, purple, and white lights, LED lights have become commonly used light-emitting devices. [0003] In order to meet the user's lighting needs, it needs to be dimmed before use. At present, the commonly used dimming device is a thyristor controller, through which the voltage of the integrated circuit of the LED lamp is adjusted, and then the conduction angle of the AC output voltage is changed, and the average voltage effective value of ...

AI Technical Summary

Problems solved by technology

[0004] However, the currently commonly used thyristor controllers have the following technical problems: First, the voltage modulated by the thyristor controller is only suitable for purely resistive loads and loads whose operating voltage matches the mains, and it is difficult to adapt to capacitive loads, inductive loads or For low-voltage loads, if a capacitive, emotional or low-voltage adjustment circuit is added to the output of the thyristor controller, because the electrical signal is subjected to multiple processing, once the circuit is disturbed, the output voltage is likely to change, reducing the voltage. Stability increases the difficulty of regulation, and increasing the configuration circuit will increase the difficulty and cost of the integrated circuit.

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