41results about How to "With overcurrent protection" patented technology

The invention discloses a temperature sensor based on a magnetic tunnel junction component. The temperature sensor comprises a magnetic tunnel junction (MTJ) component, a p-channel metal oxide semiconductor (PMOS) component and an analog switch. A source of the PMOS component is connected with a power supply, and a drain of the PMOS component is connected with an input end of the MTJ component and is led out of a voltage output end; an output end of the MTJ component is grounded or connected with a circuit through the analog switch; and a drain of the PMOS component and a grid of the PMOS component are in short-circuit connection. The temperature sensor can also comprise an operational amplifier. A negative input end of the operational amplifier is connected with the voltage output end and a positive input end of the operational amplifier is connected to a reference voltage. The sensor can be compatible with a complementary metal oxide semiconductor (CMOS) technology and has the functions of temperature monitoring, overtemperature protection, overcurrent protection and the like.

The invention discloses an excitation type blue light LED lamp protection system. The excitation type blue light LED lamp protection system is characterized by being mainly composed of a gate drive circuit, a logical control circuit, a power amplifier P1, a power amplifier P2, a pulse comparator U1, a pulse comparator U2, a field-effect tube MOS1, a field-effect tube MOS2, a field-effect tube MOS3, a field-effect tube MOS4 and an oscillator, wherein the power amplifier P1 and the power amplifier P2 are connected with the logical control circuit, the pulse comparator U1 and the pulse comparator U2 are connected with the logical control circuit, gates of the field-effect tube MOS1, the field-effect tube MOS2, the field-effect tube MOS3 and the field-effect tube MOS4 are connected with the gate drive circuit, and the oscillator is connected between the negative pole input end of the pulse comparator U1 and the negative pole input end of the pulse comparator U2 in series. The excitation type blue light LED lamp protection system has the short circuit protection function, the overvoltage protection function and the open circuit protection function, and the power consumption of the excitation type blue light LED lamp protection system is quite low and is only one third of the power consumption of a traditional protection circuit. According to the excitation type blue light LED lamp protection system, as a switching current source is arranged, the electricity demand of a protection circuit can be guaranteed, external electromagnetic interference can be effectively avoided, and the control sensitivity and the control accuracy can be improved.

The invention discloses a temperature compensation type logic amplification power supply device. The temperature compensation type logic amplification power supply device is characterized in that the device is mainly composed of a direct-current power supply S, a control circuit connected with the direct-current power supply S, a temperature compensation circuit connected with the control circuit and a light dependent resistor CDS connected with the temperature compensation circuit; a light beam excitation type logic amplification circuit is connected between the direct-current power supply S and the light dependent resistor CDS in series. The device is simple in overall structure and very convenient to manufacture and use. Meanwhile, an output current value can be automatically adjusted according to the temperature change of external environment, signals amplified by a power amplification circuit cannot be attenuated greatly, and therefore the quality and performance of the amplified signals can be ensured, it is ensured that the performance of the amplified signals is more stable, radio-frequency interference of the circuits and the outside is effectively lowered, and it is ensured the performance is stable.

The invention discloses an emitter coupling type asymmetric bipolar logic amplifier power supply device which mainly comprises a direct-current power supply S, a diode D1 and an electronic switch K, wherein the P pole of the diode D1 is connected with the positive pole of the direct-current power supply S, the N pole of the diode D1 passes a load resistor and then forms a circuit with the negative pole of the direct-current power supply S, and the electronic switch K is connected with the diode D1 in parallel. The emitter coupling type asymmetric bipolar logic amplifier power supply device is characterized in that passive pi type filter circuits and emitter coupling type asymmetric circuits are connected between the N pole of the diode D1 and the negative pole of the direct-current power supply S in series, and the emitter coupling type asymmetric circuits are connected with the passive pi type filter circuits; meanwhile, beam stimulation type logic amplifier circuits are connected between the emitter coupling type asymmetric circuits and the direct-current power supply S in series. The multiple stages of filter circuits and the logic amplifier circuits are included so that multiple harmonics caused by load changes can be effectively removed, detection accuracy can be guaranteed, it can also be guaranteed that signals amplified through the device can not attenuate greatly, and the quality and the performance of the amplified signals can be guaranteed.