2results about How to "With hysteresis" patented technology

The utility model provides a high-voltage direct-current power supply protection circuit, which is characterized in that a first main circuit is arranged between a power supply input end and a power supply output end, a second main circuit is arranged between the power supply output end and a grounding end, and a first branch circuit and a second branch circuit are arranged between the first main circuit and the second main circuit; the non-inverting input end of the comparator U2A and the inverting input end of the comparator U2B are simultaneously connected with the reference voltage source U1 and the first main circuit, the inverting input end of the comparator U2A is connected with the first branch circuit, the non-inverting input end of the comparator U2B is connected with the second branch circuit, and the output end of the comparator U2A and the output end of the comparator U2B are simultaneously connected with the third branch circuit; the drain electrode and the source electrode of the NMOS tube Q3 are connected with the second branch, and the grid electrode of the NMOS tube Q3 is connected with the third branch; the grid electrode of the NMOS tube Q4 is connected with the third branch, and the drain electrode of the NMOS tube Q4 is connected with the grid electrode of the PMOS tube Q2. The circuit is suitable for overvoltage and undervoltage protection of a high-voltage direct-current power supply, the circuit has a hysteresis characteristic, and repeated switching of the power supply caused by action of the protection circuit is avoided.

This application provides a current-type Hall effect sensor circuit, belonging to the technical field of Hall effect sensor circuits. Addressing the problem of poor output signal stability in Hall effect sensor circuits, this application provides a current-type Hall effect sensor circuit, including: an operational amplifier, a voltage divider unit, a feedback unit, a first RC low-pass filter unit, and a second RC low-pass filter unit; the first RC low-pass filter unit is connected between the non-inverting input terminal of the operational amplifier and an external driving module, which outputs a Hall signal during driving; a voltage divider unit is connected between the inverting input terminal of the operational amplifier and the power supply voltage terminal, and a feedback unit is connected between the output terminal of the operational amplifier and its inverting input terminal, forming a feedback loop, with the power supply voltage terminal providing the power supply voltage signal; the second RC low-pass filter unit is connected between the output terminal of the operational amplifier and an external processing module. This application has strong adaptability and high output signal stability.