45results about How to "Avoid circuit damage" patented technology

Provided is a flexible printed circuit board (FPCB) including a circuit connector connected to a circuit board connector of a printed circuit board (PCB) for electronic equipment. A first compression unit and a second compression unit are included in the circuit connector, and a folding unit is provided at an interface between the first compression unit and the second compression unit such that the folding unit, instead of a plating interface of the first compression unit and the second compression unit, is folded by a force generated when the circuit connector is connected to the circuit board connector.

Provided is a high-reliability level shift circuit not prone to faulty operation due to noise. A level shift circuit 1 is provided with: first and second current control elements 12a and 12b into control terminals of which a reverse-phase input signal and an in-phase input signal are input, respectively; first and second load circuits 13a and 13b which are connected at one end to a high-side power source terminal Vb and at the other end to each of first terminals of the first and second current control elements 12a and 12b; a comparator 14 in which a pair of differential input terminals Np and Nn are connected separately to each of the first terminals of the first and second current control elements 12a and 12b; a current generating circuit 3 in which first and second current output terminals Na and Nb are connected to second terminals of the first and second current control elements 12a and 12b, and which separately generates a current which flows through the respective first and second current control elements 12a and 12b; and voltage suppressing circuits 15a and 15b which are connected separately or commonly to the first and second current output terminals Na and Nb, respectively, and suppress voltage from rising in the first and second current output terminals Na and Nb, respectively.

An electric motor control unit mounted in an automotive vehicle having a motor that is variable in its rotational speed. A temperature sensing element is arranged to contact a busbar so that relays permit switching operation in response to detection of abnormal heat generation. This controls an electrical power supply to the motor to decrease the rotational speed of the motor without complete stopping of the motor. The rotational speed of the motor returns to a normal speed from the decreased speed by switching operation of the relays with diminishing of the abnormal heat generation.

The present invention relates to an anisotropic conductive adhesive comprising an anisotropic conductive adhesive combined with a crystalline polymer to realize anisotropic conductivity and PTC (Positive Temperature Coefficient) characteristics at the same time. The anisotropic conductive adhesive having PTC characteristics according to the present invention comprises an insulating adhesive component and a plurality of conductive particles dispersed in adhesive component, in which the insulating adhesive component comprises a crystalline polymer. Since the anisotropic conductive adhesive according to the present invention includes a crystalline polymer, when temperature rises and the volume expands, electrical resistance is rapidly increased, whereby current flow is intercepted resulting in blocking current, providing PTC characteristics acting as a switch. Thus, it shows circuit protection function as well. Accordingly, it is possible to intercept a circuit upon occurrence of excess current without using a separate element for circuit protection such as PTC thermistor.

The present disclosure relates generally to a switch driving circuit and power factor correction circuit having the same, and more particularly, to a technology to provide a negative offset using Zener diodes to prevent malfunctions in driving a switch. The switch driving circuit to operate a switch implemented with a Field Effect Transistor (FET) includes a first Zener diode connected to a control input end of the switch; a capacitor connected in parallel with the first Zener diode; and second and third Zener diodes for providing a negative offset to fix a voltage applied between the gate and source of the switch to a negative value.

A communication circuit is realized which uses three wires, including a power supply, to provide an erroneous-connection protection, a long wiring, and a high-rate transmission. In a communication system using, as a shared wire, one of two AC power supply wires, a first constant current source is series connected, in a master station, with a master station transmission photo-coupler, a reception photo-coupler and a constant voltage diode in the named order from the positive side of the power supply to the negative side thereof serving as a reference, and a communication path, which extends from a node located between the transmission and reception photo-couplers, is wired through a relay to slave stations. In each of the slave stations, a circuit, in which a second constant current source and a slave station reception photo-coupler are series connected with a reference wire, is parallel connected, via a relay, with a photo-coupler so disposed as to short-circuit an output of the relay to the reference wire. The relay is controllably turned on when it is determined that a potential difference between the communication path and the reference wire becomes below a predetermined value.

The present disclosure relates generally to a switch driving circuit and power factor correction circuit having the same, and more particularly, to a technology to provide a negative offset using Zener diodes to prevent malfunctions in driving a switch. The switch driving circuit to operate a switch implemented with a Field Effect Transistor (FET) includes a first Zener diode connected to a control input end of the switch; a capacitor connected in parallel with the first Zener diode; and second and third Zener diodes for providing a negative offset to fix a voltage applied between the gate and source of the switch to a negative value.

The invention belongs to the technical field of automobiles, and provides a vehicle and an on-board monitoring device thereof and a vehicle signal detection circuit. The vehicle signal detection circuit comprises: a detection signal input module, a signal pre-processing module, a reference voltage generation module, a voltage comparison module and a main control Module. The signal pre-processing module performs surge protection processing and voltage conversion processing on the received detection signal, and outputs stable to be compared voltage to the voltage comparison module, thereby effectively preventing circuit damage caused by surge, and using the voltage comparison module to compare the voltage to be compared with the reference voltage. The voltage is compared to produce a comparison result, and the wide voltage input and comparison of the multi-path signal is realized. The main control module collects the comparison result, and analyzes the state of the vehicle according to the comparison result, and adjusts the reference voltage according to needs to satisfy voltage comparison requirements of various vehicles, thus effectively solving the problem of complicated circuit and high cost existing in the existing vehicle signal detection circuit.

The invention provides a magnetic head capable of positively preventing electrostatic breakdown of an MR magnetic head device, and a method of manufacturing the magnetic head. A circuit board comprises at least a pair of leads for constructing a circuit, lands connected respectively to the leads, and solder bumps formed respectively on the lands. The solder bumps are arranged in an adjacent relationship and, when the solder bumps are crushed, peripheral portions of the solder bumps are pressed or spread so as to overlap with each other. The magnetic head includes the circuit board.

Techniques are disclosed relating to rapidly downshifting the output frequency of an oscillator. In some embodiments, the oscillator is configured to operate in a closed-loop mode in which negative feedback is used to maintain a particular output frequency (e.g., in a phase-locked loop (PLL)). In some embodiments, the negative feedback loop is configured to maintain the output of the oscillator at a particular frequency based on a reference clock signal and the output of the oscillator. The nature of a negative feedback loop may render rapid frequency changes difficult, e.g., because of corrections by the loop. Therefore, in some embodiments, the loop is configured to switch to an open-loop mode in which a control input to the oscillator is fixed. In some embodiments, the loop switches to open-loop mode in response to a trigger signal and control circuitry forces the oscillator to a new target frequency.

A substrate cleaning method is capable of preventing a liquid stream on a substrate from being cut and circuit patterns thereon from being damaged. The substrate cleaning method includes a liquid film forming process that forms a liquid film on an entire substrate surface by supplying a cleaning liquid L from a central portion of the substrate W toward a peripheral portion thereof while rotating the substrate; a drying region forming process that discharges a gas G on the substrate surface and removes the cleaning liquid on the substrate surface; and a residual liquid removing process that removes the cleaning liquid remaining between the circuit patterns by discharging a gas G while moving in a diametrical direction of the substrate.

A solid-state magnet control includes a housing and magnet control circuitry mounted within the housing. The magnet control circuitry includes an insulated gate bipolar transistor (IGBT) bridge configuration and DUMP circuitry. The DUMP circuitry inhibits circuit damage to the magnet control circuitry and other components contained within the magnet control caused by overvoltage and / or voltage transients. The magnet control circuitry controls current passing through the magnet. The IGBT bridge configuration includes a LIFT HIGH IGBT, a LIFT LOW IGBT, a CLEAN HIGH IGBT, and a CLEAN LOW IGBT, as well as a capacitor bank. The DUMP circuitry includes a DUMP HIGH IGBT, a discharge diode, and a discharge resistor. The magnet control is configured to provide power loss ride through, ground fault detection, and discharge voltage control, and can accept increased voltage supply to reduce charge-up time of the magnet, and existing operator control inputs through a relay interface.

A lithium battery charging management system disclosed by the present invention comprises a power supply circuit, a switch circuit, a data acquisition circuit, a control circuit and a lithium battery,wherein the power supply circuit is connected with the control circuit, the control circuit is connected with the switch circuit, the switch circuit is connected with the lithium battery, and the control circuit and the lithium battery are connected to the data acquisition circuit. The power circuit is connected with a switch chip of the switch circuit, the switch chip comprises a first field effect transistor and a first triode, the fast recovery diode and the inductor belong to the switch circuit, a collector of the first triode is connected to the fast recovery diode, the fast recovery diode is connected with the inductor, and the inductor is connected to the lithium battery. The data acquisition circuit comprises a current feedback circuit and an over-current protection circuit, the current feedback circuit comprises a second triode, and the over-current protection circuit comprises a diode group composed of a plurality of diodes connected in parallel. The invention further provides a lithium battery charging management method, so that the circuit power consumption is effectively prevented from being too high, the problem of circuit damage caused by heating is avoided, and theworking reliability is improved.

A rotary connector apparatus includes: a ring-shaped fixed member; a ring-shaped rotating member rotatably fitted to the fixed member; a flexible flat cable housed in a housing space formed by the fixed member and the rotating member, the flexible flat cable having a plurality of wires, one end of the flexible flat cable being fixed to the fixed member and another end thereof being fixed to the rotating member, wherein a first connector housing attached to the fixed member accommodates a plurality of electrically conductive paths that respectively connect a plurality of first terminals to the plurality of wires at said one end of the flexible flat cable, and at least one of the plurality of electrically conductive paths is configured to removably receive a protection device so as to protect the path from overcurrent.

Grounding clips for electrical components are disclosed to eliminate or significantly reduce ESD and EMI. A grounding clip includes a first leg oppositely disposed with respect to a second leg and connected to the second leg by a third leg, mounting tabs for connecting the first and second legs to a PCB, a resilient upper flange formed in the third leg and angled with respect to the third leg inwardly toward the first mounting tab and the second mounting tab (e.g., for compression fit with respect to an SFP mounting cage), resilient flanges formed in the first and second legs and angled to extend inwardly toward one another. A hook member extends outwardly from an edge of the first leg to form an electromagnetic gasket with respect to a front panel and grounding clip.

The invention is suitable for the technical field of wireless charging, and provides a wireless charging system startup control method and device and a wireless charging system. The method comprises the following steps: obtaining output end voltage of a buck module in a receiving end; judging whether the output end voltage is greater than a preset threshold; when it is judged that the output end voltage is larger than a preset threshold value, controlling the buck module to discharge the voltage of the output end until the voltage of the output end is not larger than the preset threshold value; when it is judged that the output end voltage is not larger than the preset threshold value, judging whether the buck module breaks down or not; if so, controlling the buck module to be closed and restarted, and re-obtaining the voltage of the output end of the buck module in the receiving end again after a preset time until it is judged that the voltage of the output end is not larger than thepreset threshold value and the buck module does not break down; and if not, controlling the buck module to work normally. The problem that the system power density and efficiency are reduced due to the fact that a discharging circuit is adopted for preventing energy of an output capacitor of a receiving end from flowing backwards is solved.

The invention discloses an anti-interference treadmill control circuit having compensation and automatic protection functions. The anti-interference treadmill control circuit is characterized by comprising an AC filtering circuit, a first rectification filtering circuit, a second rectification filtering circuit, a voltage reduction circuit, a controller circuit, a PWM control circuit and a speed measurement circuit, wherein the AC filtering circuit is connected with the commercial power and is then connected with the first rectification filtering circuit and the second rectification filtering circuit after eliminating interference signals of the commercial power, the commercial power supplies power for the PWM control circuit after passing through the first rectification filtering circuit, the PWM control circuit is connected with a motor and the speed measurement circuit and is then connected with an MCU, the first rectification filtering circuit is connected with the voltage reduction circuit and is then connected with the controller circuit and the MCU through the voltage reduction circuit, and the controller circuit is connected with the MCU. The anti-interference treadmill control circuit is advantaged in that the circuit is simplified, and safety of products is further improved.

A video doorbell system coupled with a ringtone generating unit is applied by a power supply adjusting method and includes a video generating module and a mode switching controller. The video generating module includes a power storing component. The mode switching controller can be switched into a first mode or a second mode in a remote controlling manner. While the mode switching controller is switched into the first mode, the ringtone generating unit is bypassed and an external power source is connected to the video generating module, so as to charge the power storing component by the external power source. While the mode switching controller is switched into the second mode, the video generating module is bypassed and the external power source is connected to the ringtone generating unit, and the video generating module can execute image capturing function via the power storing component.

The invention belongs to the technical field of lighting device or its system functional characteristics or parts thereof, and particularly discloses a special-shaped display screen and backlight plate thereof. The special-shaped display screen and backlight plate thereof comprises a frame, wherein the frame is provided with a reflector, a light guide plate, a lower diffuser, a lower prism, an upper prism, an upper diffuser and a liquid crystal panel are arranged from bottom to top. A protective glass is fixedly arranged on the upper end surface of the frame, a gap is reserved between the protective glass and the liquid crystal panel, a light emitting diode is arranged between the light guide plate and the frame, a heat absorption pipe is arranged in the frame, a heat dissipation pipe is arranged on the outer wall of the frame, a first liquid inlet pipe and a first liquid outlet pipe are arranged between the heat dissipation pipe and the heat absorption pipe, a heat supply pipe is arranged in the frame, a second liquid inlet pipe is arranged between the heat supply pipe and the heat dissipation pipe, a second liquid outlet pipe is arranged between the heat supply pipe and the heatabsorption pipe, a liquid medium is filled in the heat radiation pipe, the heat absorption pipe and the heat supply pipe, and a driving mechanism is arranged in the heat dissipation pipe. The purposeof the special-shaped display screen and backlight plate thereof is to solve the problem that water mist can hardly be removed due to the small gap after the water vapor enters the gap between the protective glass and the liquid crystal panel.

Techniques are disclosed relating to rapidly downshifting the output frequency of an oscillator. In some embodiments, the oscillator is configured to operate in a closed-loop mode in which negative feedback is used to maintain a particular output frequency (e.g., in a phase-locked loop (PLL)). In some embodiments, the negative feedback loop is configured to maintain the output of the oscillator at a particular frequency based on a reference clock signal and the output of the oscillator. The nature of a negative feedback loop may render rapid frequency changes difficult, e.g., because of corrections by the loop. Therefore, in some embodiments, the loop is configured to switch to an open-loop mode in which a control input to the oscillator is fixed. In some embodiments, the loop switches to open-loop mode in response to a trigger signal and control circuitry forces the oscillator to a new target frequency.

The invention discloses an electronic component control board punching device. The electronic component control board punching device comprises a base, a drilling machine and an air cylinder. A support plate is mounted on the upper portion of the base. A workbench is mounted on the upper portion of the support plate. The air cylinder is mounted on the upper portion of the part, on the inner side of the support plate, of the base. The output end of the air cylinder is provided with a control console. The upper portion of the workbench is provided with a pillar. The top of the pillar is providedwith a top plate. The bottom of the top plate is provided with a second sliding rail. The bottom of the second sliding rail is provided with a mounting plate. The bottom of the mounting plate is provided with a first sliding rail. A side plate is mounted on one side of the mounting plate. A motor is mounted on the inner side of the side plate. A screw is mounted on the output end of the motor. Byarranging a first magnet, a second magnet, the air cylinder, the control console, the first sliding rail, the motor, an electric push rod, the drilling machine and a controller structure, the problems that a pressing mechanism is not perfect, and the drilling operation precision is low are solved.

An electrostatic discharge protection device including the following components is provided. A first PNP BJT includes a P-type region, first and second N-type well regions, first P-type, first N-type, and second P-type doped regions, and an N-type region. An NPN BJT includes first P-type and third N-type well regions, a second N-type doped region, a third P-type doped region, and a third N-type doped region. A second PNP BJT includes the first P-type and third N-type well regions, the third P-type doped region, the third N-type doped region, and a fourth P-type doped region. The second P-type doped region, the first N-type doped region, the third N-type doped region, and the fourth P-type doped region are coupled to a high voltage side terminal. The first P-type doped region, the second N-type doped region, and the third P-type doped region are coupled to a low voltage side terminal.

The invention relates to the technical field of electrical elements, and discloses an axial array type rectifier bridge stack; the axial array type rectifier bridge stack comprises a lower mounting shell, wherein an upper mounting shell is clamped on the top of the lower mounting shell; the top of the upper mounting shell is movably sleeved with four symmetric screws, and the bottoms of the screwsare in threaded connection with the top of the lower mounting shell; and a first frame, a second frame, a third frame and a fourth frame are clamped on the top of the lower mounting shell. Accordingto the axial array type rectifier bridge stack, by virtue of matching of the first frame and the second frame, and matching of the third frame and the fourth frame, the first frame and the third frameare connected with the second frame and the fourth frame respectively, and a first chip, a second chip, a third chip and a fourth chip are consistent in polarity arrangement, so that when a first jumper wire is connected with the first chip, the polarity of the first chip cannot be considered, so that the phenomenon of circuit damage is prevented.

Light condensing lens, module, and photoelectric transducing apparatus are disclosed. The lens has a light receiving surface, a bottom surface, and two side surfaces. The side surfaces are obliquely connected with the light receiving surface and the bottom surface. By designing the radian of the light receiving surface, the light streams can be condensed to a predetermined region no matter where the light source is. Additionally, an auxiliary light module is provided for reflecting the light streams to the predetermined region, in order to increase the photoelectric transducing efficiency.

The present application relates to a polarizing plate and a liquid crystal display comprising same, the polarizing plate comprising: a base film; an adhesive layer provided on one side of the base film; a photocurable resin layer provided on one side of the adhesive layer; and a protective film provided on one side of the photocurable resin layer, wherein the photocurable resin layer comprises: a cured resin having a polyfunctional acrylate-based monomer, and an acrylic elastic polymer or an acrylate-based oligomer having an elongation of 5-200%; a photopolymerization initiator; and an antistatic agent, and the protective film is provided with an antistatic surface on one side thereof, which is opposite to the other side facing the photocurable resin layer.