Principle of the hottest household AC voltage regu

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Principle of household AC voltage regulator how to change 120vled AC drive to 220V use

household AC voltage regulator

the function of household AC voltage regulator is to stabilize the power supply voltage required by large fluctuations and unsuitable electrical equipment within its set value range, so that various circuits or electrical equipment can work normally under the rated working voltage. Series AC automatic voltage regulator is composed of contact autotransformer, servo motor, automatic control circuit, etc. when the electric voltage is unstable or the load changes, the automatic sampling voltage regulator control circuit sends a signal to drive the car, so that the polyamide market materials can not only provide comfort, but also heat up the servo motor again, adjust the position of the carbon brush of the autotransformer, so that the output voltage of the voltage regulator can be adjusted to the rated value and reach a stable state. This series of voltage regulators has the advantages of many varieties, complete specifications and beautiful appearance. The voltage regulator has the characteristics of undistorted waveform, high efficiency, reliable performance and long-term operation. The voltage regulator is equipped with short time delay, overvoltage and other protection functions. According to the needs of users, long time delay and undervoltage protection functions can be added. This voltage regulator can be widely used in any electric field when the testing machine has a short circuit. It is an ideal stabilized voltage power supply (voltage regulator) to ensure the normal operation of your electrical equipment

120vled drive is changed to 220V use method

1. LED is a low-voltage DC product, and the mains power is AC 220V, so its work requires LED drive power. LED driving power supply is a power converter that converts the power supply into specific voltage and current to drive led to emit light. Generally, the input of LED driving power supply includes high-voltage power frequency AC (i.e. mains power), low-voltage DC, high-voltage DC, low-voltage high-frequency AC (such as the output of electronic transformer), etc

2. LED driving principle:

the relationship between forward voltage drop (VF) and forward current (if). When the forward voltage exceeds a certain threshold (about 2V), that is, the so-called on voltage, it can be approximately considered that if is proportional to VF. At present, the maximum if of ultra bright LED can reach 1a, while the VF is usually 2 ~ 4V

since the light characteristics of LED are usually described as a function of current rather than voltage, the brightness can be better controlled by using constant current source. In addition, the change range of the forward voltage drop of LED is relatively large (up to 1V at most). A small change in VF will cause a large if change, which will cause a large change in brightness. Therefore, the constant voltage source can not ensure the uniformity of LED brightness, and affect the reliability, life and light decay of LED. Therefore, ultra bright LEDs are usually driven by constant current to obtain the test results of elongation, elongation, stress, strain and other test data sources

note: the temperature of LED is inversely proportional to the luminous flux (V). The luminous flux at 85 ℃ is half that at 25 ℃, while the output at 40 ℃ is 1.8 times that at 25 ℃. The change of temperature also has a certain impact on the wavelength of LED. Therefore, good heat dissipation is the guarantee of constant brightness of LED

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