8 results about "TRIAC" patented technology

This invention provides a triac-controlled LED driver control circuit, relating to the field of circuit technology. The circuit includes a circuit board with a microcontroller mounted on its top surface. One end of the microcontroller is electrically connected to a resistor dimmer via a power line, another end is electrically connected to a rectifier via a power line, and yet another end is electrically connected to an optocoupler via a power line. Several sets of resistive elements are arranged on the surface of the circuit board. In use, this invention enables dimming via three input signals: triac dimming, 0 / 1~10V dimming, and resistor dimmer dimming. These three dimming input signal voltage changes are converted into an output PWM signal pulse width by the microcontroller to control the turn-on time of the low-voltage MOS transistor Q3. The dimming process does not affect the normal operation of the driver power supply system, thus avoiding issues with flickering and dimming depth.

AED patient protection circuitry is improved by using triode for alternating current (TRIACs), which are significantly smaller and cheaper than relays. The TRIACs are positioned between a defibrillation waveform generator and the pads through which defibrillation waveforms are delivered to the patient and alternate under the control of a processing element such as a microcontroller between a conductive state in which they allow the defibrillation waveforms to reach the patient through the pads and an isolated state in which they prevent the defibrillation waveforms from reaching the patient through the pads. A voltage monitor interfaced to the microcontroller can monitor current leakage from the TRIACs or other portions of the defibrillator, thus detecting degradation of patient protection circuitry and further increasing defibrillator safety and reliability.

This invention belongs to, but is not limited to, the field of thyristor technology, and discloses a mesa thyristor structure for improving IGT consistency. It includes a glass tank terminal, a cathode, and a gate, with no adjacent gate region. The glass tank terminal ensures high voltage for the device. The cathode is the current outflow terminal. The gate receives a trigger current, which flows from the gate to the cathode region, controlling the thyristor's conduction. This invention reduces the distance between the cathode region and the glass tank to zero, eliminating the boron-expanded region, which no longer affects IGT parameters, resulting in minimal IGT differences between the wafer edge and central regions. During mesa etching, the width of the glass tank does not affect IGT parameters, making the requirements for mesa etching less stringent and suitable for mass production.

The present application belongs to the technical field of power electronics. Disclosed are a TRIAC overvoltage protection circuit and a solid-state circuit breaker. The overvoltage protection circuit comprises a TRIAC, a drive circuit of the TRIAC, and a piezoresistor, wherein the drive circuit comprises a drive resistor and a drive capacitor, the drive resistor and the drive capacitor are connected in series, one end of the drive capacitor is connected to a gate electrode of the TRIAC, another end of the drive resistor is connected to the piezoresistor, and another end of the piezoresistor is connected to a first power end of the TRIAC. The present solution can achieve low costs and a small volume of a solid-state circuit breaker, and can reduce the difference between a clamping voltage and a bus voltage.

The present application discloses a control board (1) suitable for use in at least one range hood and providing both a user command receiving function and a power control function in an integrated manner, the control board (1) comprising at least one integrated circuit (2); at least one switch mode power source (3) located in the integrated circuit (2) for converting alternating current to direct current; at least one command receiving element (5) located in the integrated circuit (2) for receiving at least one user command; and at least one triac (4) in the integrated circuit (2) that performs a switching function for controlling the operation of at least one element of the range hood in accordance with a user command received by the command receiving element (5).

The utility model relates to the technical field of dimming and color temperature switching, in particular to an IC chip compatible with silicon controlled dimming and color temperature switching and a multi-color-temperature switching circuit. A timer module, a first analog-to-digital conversion module, a second analog-to-digital conversion module, a third analog-to-digital conversion module, a fourth analog-to-digital conversion module, a processing module, a reference generation module, a current setting pin, a first color temperature state setting pin, a second color temperature state setting pin and a third color temperature state setting pin are arranged. The power failure detection pin, the first LED current output pin, the second LED current output pin, the electrolytic capacitor cathode pin and the electrolytic capacitor charging and discharging pin cooperate with each other to realize the dimming and multi-color-temperature switching functions.

A power control device includes a heater, a zero-cross detecting unit, a triac, a supplying unit, and a controlling unit. The supplying unit discharges an electric charge when a control signal is outputted in a half-wave of each of a first polarity and a second polarity and charges the electric charge when the control signal is not outputted in the half-wave of the first polarity. The controlling unit outputs: in a first half-wave, a first control signal on the basis of the zero-cross point and a second control signal in a first phase different in timing from the first control signal, and in a second half-wave, a third control signal on the basis of the zero-cross point and a fourth control signal in a second phase different in timing from the second control signal. The first phase and the second phase are different from each other.

The invention provides a low-PF silicon controlled rectifier dimming circuit and a lighting circuit, AC power supply voltage obtains power supply voltage through a silicon controlled rectifier dimmer and a rectification circuit to supply power to an LED, the low-PF silicon controlled rectifier dimming circuit comprises a diode and an input capacitor, the positive electrode of the diode receives bus voltage, the negative electrode of the diode is connected with the positive electrode of the LED, and the negative electrode of the diode is connected with the input capacitor. A first end of the input capacitor is connected with a common connection end of the diode and the LED, a second end of the input capacitor is grounded, and the input capacitor provides power supply voltage for the LED; a load switch connected in series with the LED; the self-adaptive adjusting circuit is used for acquiring a first voltage representing the voltage of a connection node of the load switch and the LED and generating an adjusting voltage according to the first voltage, and the adjusting voltage is used for controlling the on-off state of the load switch so as to control the current of the LED. According to the invention, the problem that the LED current is unstable when the conduction angle is small and the input capacitor is under-voltage is solved.