4results about How to "Achieve shutdown" patented technology

This invention discloses an infrared receiver, comprising a photodiode chip, a transistor chip, a resistor, a chip carrier, and a package. The photodiode chip, transistor chip, and resistor are fixed on the top of the chip carrier, and the package surrounds the top of the chip carrier. The bottom of the chip carrier extends out of the package and is provided with a control pin, a collector pin, and an emitter pin. The photodiode chip and the transistor chip are electrically connected. The resistor is connected across the two electrodes of the photodiode chip, and the transistor chip is electrically connected to the control pin, the collector pin, and the emitter pin, respectively. This infrared receiver retains the characteristics of photodiodes, such as a large detection angle, fast response speed, and low temperature drift, while also enabling signal amplification, facilitating control, having short interconnections between components, strong anti-interference capability, and a high signal-to-noise ratio.

The application discloses a low dropout linear regulator circuit which is mutually started with a bandgap reference circuit, and comprises a pre-starting circuit, an operational amplifier, a first NMOS transistor, and a bandgap reference circuit; the same-phase input end of the operational amplifier is connected with the output end of the pre-starting circuit; the gate of the first NMOS transistor is connected with the output end of the operational amplifier, and the source thereof is communicated with the input end of the bandgap reference circuit, so that an initial output voltage is generated to pre-start the bandgap reference circuit; the output end of the bandgap reference circuit is communicated with the pre-starting circuit, and after pre-starting, the LDO circuit is restarted to obtain a final output voltage, and the mutual starting of the LDO circuit and the bandgap reference circuit is realized. The application solves the problems that the traditional LDO circuit cannot provide stable bias current by itself, and the load capacity and transient response performance of the traditional bandgap reference type LDO circuit are poor, adopts a special mutual starting mechanism, simplifies the pre-starting and shutdown mechanism, improves the load capacity and transient response performance of the LDO circuit, guarantees the stable output voltage, and ensures the normal work of other modules of the system.

The application provides a CLLC resonant converter soft-start device and method, which comprises a primary side and a secondary side coupled through a transformer, the primary side comprises a first H-bridge; the secondary side comprises a second H-bridge, the opposite switch tubes S1 and S4, S3 and S2 on the first H-bridge are pulsed with the same pulse respectively, and the upper and lower switch tubes on the same bridge arm are alternately conducted; the second H-bridge is uncontrolled rectification, and no driving signal is applied on the corresponding switch tube; the duty cycles of the pulse signal and the complementary pulse signal on the first H-bridge are asymmetrically changed; the pulse signal is the pulse through the switch tube S1 and the switch tube S4; the second pulse is the pulse through the switch tube S3 and the switch tube S2; the current overcurrent during starting is inhibited, the purpose of smoothly establishing the output voltage is achieved, the ZVS opening characteristic is achieved, and the ZCS closing of half of the diodes on the rectification side is always ensured, and the high-frequency oscillation of the resonant current caused by the participation of the parasitic capacitor in the resonance can be avoided.

The utility model provides a novel switch control circuit, it includes switch control end, voltage division circuit formed by resistance R1, R2 series connection, 12V direct current power supply, power output end, P channel field effect tube Q1 and NPN type triode Q2, the grid of field effect tube Q1 is connected with the collector of triode Q2 through resistance R3, the source of field effect tube Q1 is connected with 12V direct current power supply, the drain of field effect tube Q1 is connected with power output end, resistance R1, R2 are connected between 12V direct current power supply and ground in proper order, switch control end is connected with the connecting point of resistance R1, R2, and is connected with the base of triode Q2 through resistance R4, the collector of triode Q2 is still connected with 12V direct current power supply through resistance R5, the emitter of triode Q2 is grounded. The novel switch control circuit of the utility model can connect two different circuit modules directly.