94results about How to "Prevent external electromagnetic interference" patented technology

The invention discloses an in-phase alternating-current signal amplifying type gate drive system based on a logic protection emitter-coupled type. The in-phase alternating-current signal amplifying type gate drive system is mainly composed of a drive chip M, a self-locking optical excitation circuit, a drive circuit connected with the drive chip M and an in-phase alternating-current signal amplifying circuit arranged between the drive chip M and the self-locking optical excitation circuit. The in-phase alternating-current signal amplifying type gate drive system is characterized in that a logic protection emitter-coupled circuit is further connected between the output end of a NOR gate IC2 and the negative electrode output end of a NOR gate IC3 in series. According to the in-phase alternating-current signal amplifying type gate drive system, the relevant function of the drive chip M can be automatically excited according to external illumination condition, an extra starting device is not needed, and therefore the in-phase alternating-current signal amplifying type gate drive system is quite low in power consumption.

The invention discloses a novel gate drive system for blue LED lamps. The novel gate drive system mainly comprises a transformer T, a driver chip M, a switching current source, a diode D1, a capacitor C3, a resistor R7 and a transistor Q4, wherein the switching current source is serially connected between a VCC pin and an INP pin of the driver chip M, the diode D1 is serially connected between the VCC pin and a BOOST pin of the driver chip M, the capacitor C3 is serially connected between the BOOST pin and a TG pin of the driver chip M, the resistor R7 is serially connected between the TG pin and a TS pin of the driver chip M, a base electrode of the transistor Q4 is connected with the TG pin of the driver chip M, a collecting electrode of the transistor Q4 is grounded after passing by a capacitor C4 and a capacitor C5 sequentially, and an emitting electrode of the transistor Q4 is grounded. The novel gate drive system for the blue LED lamps has the functions of short-circuit protection, overvoltage protection and open-circuit protection and is low in power consumption, and starting time of the novel gate drive system is one fourth of that of a traditional gate drive circuit.

The invention discloses an LED lamp protection system based on a logic protection emitter-coupled amplifying circuit, mainly composed of a transformer T, a driving chip M, a switching current source connected in series between a VCC pin and an INP pin of the driving chip M, a capacitor C3 connected in series between a BOOST pin and a TG pin of the driving chip M, a resistor R7 connected in series between the TG pin and a TS pin of the driving chip M, and a transistor Q4 of which the base is connected with the TG pin of the driving chip M, the collector is grounded sequentially through a capacitor C4 and a capacitor C5, and the emitter is grounded. The LED lamp protection system is characterized in that a logic protection emitter-coupled amplifying circuit is connected in series between the VCC pin and the BOOST pin of the driving chip M. The LED lamp protection system of the invention not only has the functions of short-circuit protection, over-voltage protection and open-circuit protection, but also has very low power consumption. Moreover, the starting time is only 1 / 4 of that of a traditional gate driving circuit.

The invention discloses a double-power amplification type drain electrode driving system for an LED lamp with blue rays. The system mainly consists of a partial pressure switch circuit, a control switch circuit connected with the output end of the partial pressure switch circuit, a nonlinear trigger circuit arranged at the output end of the control switch circuit, and a power amplifying circuit arranged at the output end of the nonlinear trigger circuit. The system is characterized in that a light beam excitation type logic amplifying circuit and a logic protection emitter coupling type amplifying circuit are also connected between the partial pressure switch circuit and the power amplifying circuit in series. According to the system, the nonlinear trigger circuit, the power amplifying circuit and the light beam excitation type logic amplifying circuit are combined for use creatively, so that the nonlinear characteristic of the nonlinear trigger circuit can be ensured, the safe and reliable trigger voltage can also be supplied to the power amplifying circuit, the interference of electromagnetic pulses can be obviously reduced, and the stable performance of the power amplifying circuit can be ensured.

The invention discloses an in-phase alternating current signal amplification type optical excitation grid drive circuit mainly composed of a drive chip M, a self-locking optical excitation circuit and a drive circuit, and the drive circuit is connected with the drive chip M. The in-phase alternating current signal amplification type optical excitation grid drive circuit is characterized in that an in-phase alternating current signal amplification circuit is connected between the drive chip M and the self-locking optical excitation circuit in series; the in-phase alternating current signal amplification circuit is composed of a power amplifier P, a resistor R4, a resistor R5 and the like, one end of the resistor R4 is connected with a VCC pin of the drive chip M, the other end of the resistor R4 is connected with the positive electrode input end of the power amplifier P, one end of the resistor R5 is connected with the negative electrode input end of the power amplifier P, and the other end of the resistor R5 is connected with the self-locking optical excitation circuit. The related functions of the drive chip M are automatically excited according to external light conditions, additional starting devices do not need to be added, and therefore the power consumption of the drive circuit is reduced.

An optical image anti-shake device with a yoke is provided. The optical image anti-shake device includes: a casing having a first aperture; a fixing portion having a bottom plate, the bottom plate having a second aperture corresponding in position to the first aperture; and an active portion enclosed by the casing and resiliently clamped between the casing and the bottom plate by the fixing portion, the active portion including: a correcting module for correcting, with a magnetic force, a blur of images caused by a shake of the optical image anti-shake device; a frame having a receiving space; a lens holder disposed in the receiving space of the frame; a lens unit corresponding in position to the first aperture and the second aperture, the lens unit being carried by the lens holder and having an image-capturing optical axis; and a yoke fixed to the frame.

The invention discloses a mixed type grid driving system which is mainly composed of a driving chip M, a driving circuit, a same-phase alternating current signal amplifying circuit, a self-locking light exciting circuit, a bootstrapping circuit and a power driving amplifying circuit, wherein the driving circuit is connected with the driving chip M, the same-phase alternating current signal amplifying circuit is connected with the driving chip M, the self-locking light exciting circuit is connected with the same-phase alternating current signal amplifying circuit, the bootstrapping circuit is connected with the self-locking light exciting circuit, and the power driving amplifying circuit is arranged between the self-locking light exciting circuit and the driving chip M. The mixed type grid driving system is characterized in that the mixed type grid driving system is further provided with a light beam exciting logic amplifying circuit and a logic protective emitter-coupled type amplifying circuit, wherein the light beam exciting logic amplifying circuit is connected with the bootstrapping circuit, the self-locking light exciting circuit and the power driving amplifying circuit respectively, and the logic protective emitter-coupled type amplifying circuit is connected between the power driving amplifying circuit and the driving chip M in series. The related functions of the driving chip M are excited automatically by the mixed type grid driving system according to external lighting conditions, a starter does not need to be arranged additionally, and therefore power consumption is extremely low. Meanwhile, the starting time of the mixed type grid driving system is only one fourth of that of a traditional grid driving circuit, and the stating time of the mixed type grid driving system is extremely short.