2 results about "Precision rectifier" patented technology

This utility model discloses a voltage detection device for power transmission and transformation equipment, including a voltage detector. The voltage detector includes a voltage detection circuit and an alarm circuit. The voltage detection circuit includes a voltage divider and limiter circuit, a voltage follower circuit, a second-order low-pass filter circuit, a dual-power precision rectifier circuit, a microcontroller, and an alarm circuit. The voltage divider and limiter circuit is used to induce voltage. The voltage follower circuit utilizes the characteristics of high input impedance and low output impedance for impedance matching. The second-order low-pass filter circuit filters out high-frequency noise signals. The induced voltage from the dual-power precision rectifier circuit is transmitted to the microcontroller. When the induced voltage exceeds a set value, the microcontroller sends a signal to the alarm circuit. This voltage detection device for power transmission and transformation equipment can sensitively react to weak induced voltage inputs and issue warning signals, which can prevent electric shock accidents during high-voltage maintenance. It is also easy to install on grounding rods and grounding wires, and can also be connected to an extension pole for independent voltage detection.

The invention discloses a knocking sensor circuit and a household appliance. The knocking sensor circuit comprises a vibration mechanism, a precision rectification circuit and a controller. The vibration mechanism is used for outputting an AC voltage signal after receiving mechanical vibration. The precise rectification circuit is connected with the vibration mechanism and is used for converting the alternating-current voltage signal into a direct-current voltage signal; and the controller is connected with the precise rectifying circuit and is used for generating a pulse waveform signal based on the direct-current voltage signal and judging whether effective knocking occurs or not based on the pulse waveform signal. Through the above mode, the knocking sensor circuit rectifies an original AC voltage signal into a DC voltage signal suitable for being processed by a controller through additionally arranging the precision rectification circuit, thereby reducing the cost of the controller, and reducing the software development difficulty.