7240results about "Electronic switching" patented technology

The invention relates to a simple and reliable touch control switch. The simple and reliable touch control switch consists of a 12-V direct-current power supply, a one-way silicon controlled rectifier 1 (SCR1) trigger circuit, a one-way silicon controlled rectifier 2 (SCR2) trigger circuit, a relay control circuit and a load RL circuit. A conventional mechanical self-locking rocker switch or a toggle switch has the defects that actions are mechanical, operating actions are different because of persons, a contact is easy to jitter, a contact is easy to ablate, abrade and the like. The touch control switch is realized by only using a small number of common components and two touch metal pieces, namely an on-load circuit is switched on by touching a touch electrode once, and an off-load circuit is switched off by touching the touch electrode once. The overall touch control switch is made of discrete components, and strong electricity can be effectively isolated from weak electricity through a relay, so that the power supply of a load can use alternating current and also can use direct current. Therefore, the touch control switch has a certain function in the field of household appliances, industrial automation, and optical, mechanical and electrical integration.

A method may include receiving an input signal, generating a baseline signal based on the input signal, generating a corrected input signal by subtracting the baseline signal from the input signal, determining a threshold level change of the input signal when the corrected input signal exceeds a level change threshold, and responsive to the threshold level change, updating the baseline signal to the level change threshold.

A system and method are used to maintain a variance in feedback factors of an amplifier between the first and second phases either below a threshold value or within a specified range. The system includes the amplifier and first through third capacitances. The amplifier is coupled between an input node and an output node that operates during first and second phases of operation. The first capacitance is coupled across the amplifier and between the input node and the output node during the first and second phases of operation. The second capacitance is coupled to the input node during the first phase of operation. The third capacitance is coupled to one of the input and output nodes during one or both of the first and second phases of operation.

A heterojunction device having at least three terminals, the at least three terminals comprising a high voltage terminal, a low voltage terminal and a control terminal. The heterojunction device further comprises at least one main power heterojunction transistor, an auxiliary gate circuit comprising at least one first low-voltage heterojunction transistor, a pull-down circuit comprising a capacitor and a charging path for the capacitor. The heterojunction device further comprises at least one monolithically integrated component, wherein the capacitor is configured to provide an internal rail voltage for the at least one monolithically integrated component.

The disclosure relates to an electronic circuit to verify the integrity of a switch. The circuit comprises a voltage comparator and decoupling switch. The decoupling switch configured receive the driving signal having a first logic value to enable the monitoring of the comparison voltage and is configured to receive the monitoring enable signal having a first logic value to command the opening of the decoupling switch. The electronic circuit is configured to generate the output monitoring signal having a first logic value in an event that the switch is an open circuit and having a second logic value in an event that the switch is a short circuit.

The embodiment of the invention discloses a bidirectional switching device. The bidirectional switching device comprises a control node, a first load node, a second load node, a main substrate, a main transistor and a substrate potential modulation circuit, the main transistor is a bidirectional conduction transistor and comprises a first gate terminal, a first main electrode terminal, a second main electrode terminal and a first main substrate terminal, the first gate terminal is connected to the control node, and the second gate terminal is connected to the second load node. The first main electrode terminal is connected to a first load node, the second main electrode terminal is connected to a second load node, and the first main substrate terminal is connected to the main substrate. The substrate potential modulation circuit adjusts the substrate potential of the bidirectional switching device to be always basically consistent with the lower voltage in the voltages at the first main electrode terminal and the second main electrode terminal according to the signals in the first main electrode terminal and the second main electrode terminal. Therefore, the potential floating of the main substrate can be effectively inhibited, and the stability and the performance consistency of the device are improved.

A method of driving a transistor between switching states includes controlling a transition of a gate voltage at a gate terminal of a transistor during each of a plurality of turn-off switching events to turn off the transistor, wherein the transistor is configured to be turned off according to a desaturation time during each of the plurality of turn-off switching events; measuring a transistor parameter indicative of a voltage slew rate of the transistor for a first turn-off switching event during which the transistor is transitioned from an on state to an off state; and regulating a duration of the desaturation time for a next turn-off switching event based on the measured transistor parameter.

A device for implementing a non-reciprocal bandpass filter is provided. The device includes a plurality of capacitively-coupled shunt resonators. Each capacitively-coupled shunt resonators includes a plurality of superconducting quantum interference devices (SQUIDs) connected to each other, a flux line inductively coupled to the plurality of SQUIDs, and a capacitor connected in parallel to the plurality of SQUIDs.

This invention provides a driving device and its control method. The driving device is used to drive a power switch. The driving device includes a power supply, a first bridge arm coupled to the power supply, a second bridge arm coupled in parallel to the first bridge arm, and a resonant inductor. The first bridge arm includes a first switch and a second switch connected to a first midpoint. The second bridge arm includes a first semiconductor device and a second semiconductor device connected to a second midpoint. The resonant inductor is coupled between the first midpoint and the second midpoint. The control method includes: turning on the first switch for a first time period to charge the gate of the power switch; and, in response to the current of the resonant inductor dropping to a first threshold, turning on the first switch again for a second time period to make the potential of the first midpoint equal to the potential of the second midpoint. Compared with conventional technical solutions, this invention can effectively reduce driving losses and suppress oscillations.

The invention belongs to the technical field of vehicle-mounted power supplies, and particularly relates to a driving circuit of a safety switch of a low-voltage battery, a low-voltage battery power supply system and a vehicle power system, and the driving circuit comprises a driving module, a reference end of which is used for being connected with a source electrode of the safety switch and is grounded; one end of the driving resistor is connected with the output end of the driving module, and the other end is connected with the grid of the safety switch; one end of the limiting capacitor is connected with the other end of the driving resistor, and the other end of the limiting capacitor is connected with the drain electrode of the safety switch or grounded; wherein the capacitance value of the limiting capacitor at least exceeds the capacitance value of a parasitic Miller capacitor of the safety switch with the preset first multiplying power, so that the grid current of the safety switch is limited, and the Miller plateau area of the safety switch is prolonged. The Miller platform area of the safety switch is prolonged, so that the drain current iD of the safety switch can charge the inner side capacitor in an approximate constant current mode, triggering of a reverse over-current fault is prevented, and charging of the inner side capacitor cannot be interrupted.

The invention relates to a self-adaptive IGBT turn-off peak suppression circuit, a control method, equipment and a medium, an absorption circuit is connected between a collector and an emitter of each IGBT, each absorption circuit is composed of a plurality of absorption sub-modules and a plurality of relays, all the absorption sub-modules are connected in parallel between the collector and the emitter of the corresponding IGBT, and the relays are connected in parallel between the absorption sub-modules and the relays. A relay is added between nodes where every two absorption sub-modules are connected with the collector electrode of the IGBT; the voltage sampling module and the current sampling module are respectively used for collecting voltage and current of the IGBT; the comparison module is used for comparing the voltage output by the voltage sampling module with a set voltage threshold value, calculating power and comparing the power with a set power threshold value; and the control module receives a comparison result of the comparison module and outputs a control signal according to the result to control the on and off of each relay. According to the invention, the absorption circuit is adaptively adjusted according to different powers or bus voltages, so that accurate protection of the IGBT is realized.

A semiconductor switch comprising a first main terminal, a second main terminal, and a control terminal, the semiconductor switch further comprising: a III-nitride high-electron-mobility transistor (HEMT), the III-nitride HEMT comprising a first source terminal, a first drain terminal, and a first gate terminal; a first interface circuit operatively connected to the control terminal and to the first gate terminal; and a short-circuit detection circuit operatively connected to the first drain terminal and the first source terminal, the short-circuit detection circuit being configured to: sense a short-circuit across the first drain terminal and the first source terminal; and transmit a short-circuit detection signal to the first interface circuit, the first interface circuit being configured, upon receipt of the short-circuit detection signal, to cause the III-nitride HEMT to turn off, and / or to cause a voltage across the first gate terminal to be reduced.

The application provides a synergic dynamic lighting method and its adjustable light direct current incandescent lamp, relates to the field of vision and lighting, and aims to ensure that light is uniform and dynamic in the field of vision; the color temperature is strictly imitated candlelight; the core is direct current adjustable light incandescent lamp technology; and the light in the field of vision is mostly non-uniform and static in the present night desktop lighting, and the light quality is never as good as direct current incandescent lamp; this easily leads to eye accommodation laxity and induces axial myopia; the application mainly comprises two direct current incandescent lamp platforms, one of which illuminates a book, and the other of which illuminates a white wall in front of the eyes; the light intensity of each is adjustable to ensure the uniformity of light in the field of vision, so that the fovea and peripheral rod cells of the retina are stimulated at the same time; the two lamps can also realize the synchronous adjustment of illumination according to the program, thereby guiding the dynamic focusing of the eyes and realizing dynamic lighting; the dynamic also reflects the low color temperature mammal lighting imitating candlelight according to the biological clock and the anti-alzheimer's lighting with 40Hz deep frequency flash.

The invention relates to power semiconductor device on-line monitoring and power electronic system control, in particular to a SiC MOSFET conduction current extraction circuit and method, high-frequency oscillation interference is effectively suppressed through a second-order passive RC filter circuit, a measurement error less than or equal to 1.5% is realized within a current range of 50A-300A in combination with an accurate mathematical model established by a depth symbol optimization algorithm, and the measurement accuracy is improved. The requirement of the intelligent gate driver on high-precision current feedback is met, and the measurement precision is remarkably improved; the pulse width direct analysis technology is adopted, a traditional active integrator and a digital decoding link are omitted, the system response delay is smaller than or equal to 500 ns, microsecond-level over-current protection can be supported, the response speed and the real-time performance are optimized, and the system safety in a high-frequency application scene is remarkably improved.

Systems and devices for a USB power adapter to provide power to meet requirements of a user device and identify the power adapter to the user device when connected are described. The systems include a USB adapter having a power, ground, and first and second signal connectors. The first and second signal connectors are connected to an integrated circuit of the USB adapter including a transistor. The first and second signal connectors are also connected to a diode arranged in parallel with the transistor.

A switching circuit includes a power switch, a first driver configured to drive the power switch based on a first input signal, a delay circuit configured to output a delayed input signal, and a second driver configured to drive the power switch based on the delayed input signal. The first driver has a first driving strength and is configured to drive the power switch in a first stage of operation. The delayed input signal is delayed by a delay value relative to a second input signal. The second driver has a second driving strength higher than the first driving strength and is configured to drive the power switch in a second stage of operation, which is subsequent to the first stage of operation.

The utility model discloses an anti-tamper detection circuit and communication equipment, the communication equipment comprises a power supply module, a processing module and an anti-tamper detection module, the anti-tamper detection module comprises an anti-tamper detection circuit, and the anti-tamper detection circuit comprises an anti-tamper switch, a first switch and a signal trigger module; the processing module is connected with the power supply module, the anti-disassembly detection module is connected with the power supply module and the processing module, and the anti-disassembly detection module is configured to send a power supply signal and a disassembly signal when detecting that the communication equipment is disassembled; wherein the power supply module is configured to power on the processing module in response to a power supply signal and control the processing module to start; and after being started, the processing module responds to the disassembly signal and destroys data stored in the communication equipment. Through the mode, the communication equipment can be automatically powered on and started up when illegal disassembly is detected in the shutdown state, self-destruction is immediately realized, a large amount of encrypted data is deleted, and the safety of the communication equipment is improved.

An output node of a high-side driver circuit 220 is connected to a gate of a high-side transistor MH. The high-side driver circuit 220 is operable in a first mode in which the high-side driver circuit 220 outputs a drive current IHG_ON of a first current amount in a first period after a high-side control signal HGCTL transitioned from off-level to on-level, and outputs, in a second period following the first period, a drive current of a second current amount less than the first current amount.

The invention belongs to the field of power device driving, particularly relates to the technical field of crosstalk suppression, and more particularly relates to a crosstalk suppression driving circuit. Through cooperative work of the driving module, the detection module, the buffering module and the clamping module, crosstalk is effectively suppressed while the switching speed is ensured. The driving module ensures normal switching action of the power device; the detection module converts the drain voltage change rate into a detection signal in real time, and recognizes the crosstalk risk in advance; the buffer module suppresses forward crosstalk by absorbing grid forward voltage spikes; the clamping module immediately conducts a low-impedance path from the grid electrode to the negative power supply when the detection signal exceeds a threshold value, and negative crosstalk is quickly eliminated. According to the design, the suppression circuit is only activated when the voltage change rate exceeds the standard, switching delay caused by a traditional fixed buffer circuit is avoided, accurate and rapid crosstalk suppression can be achieved, and finally the suppression effect and the system reliability are remarkably improved while the high-speed switching performance is maintained.

The present disclosure discloses an electrical discharge circuit. A voltage-dividing circuit performs voltage division on a voltage input terminal. A detection circuit generates a boosted detection signal. A first inverter is coupled to a first voltage feeding terminal and a second inverter input terminal. A second inverter is coupled to a first inverter output terminal and a ground terminal. A capacitor circuit of a RC circuit is coupled to the first voltage feeding terminal through a resistor to be charged to provide electric charges to the inverter input terminals. A first switch circuit is coupled to one of the inverter input terminals and the ground terminal. The boosted detection signal turns on and off the first and the second switch circuits respectively when an ESD input occurs such that a first and a second discharge transistors controlled by the inverter output terminals turn on to discharge the voltage input terminal.

The invention discloses a GaN HEMT discrete multi-stage active gate driver and a driving method, and relates to the technical field of gate drivers, and the driver comprises a PWM generation module which outputs a PWM high-frequency signal; the driving signal generation module is used for generating a driving signal through a logic gate combination PWM signal and adjusting a driving stage; the gate driving module comprises two independent dual-channel gate drivers, each driver is provided with two independent driving units, each driving unit comprises a driving stage, and the driving stages are controlled through driving signals to enable the GaN HEMT to have discrete gate resistance values; and the device service life condition prediction module is used for optimizing an active grid driving strategy by collecting dynamic electrical parameters and thermodynamic parameters of the device in real time. According to the invention, switching oscillation and voltage and current overshoot generated by the GaN HEMT at an ultrahigh switching speed are effectively suppressed, real-time service life prediction and active protection of the GaN HEMT are realized, and the system reliability is improved.

The invention relates to the technical field of interface circuits, in particular to a multi-mode switching detection circuit for a Type-C interface, which is used for realizing peripheral type identification and automatic switching between a USB host mode and a DP input mode on a single Type-C interface. The circuit comprises an interface detection unit connected with a Type-C female seat interface, a voltage comparison unit, a main control processor chip, a mode discrimination unit and a control output unit. The voltage comparison unit carries out resistance voltage division and threshold comparison on CC pin voltage, two levels are formed at a detection node and sent to the main control processor chip, and USB equipment and DP source equipment are distinguished by the mode judgment unit. The control output unit controls the USB host power supply control circuit and the DP input chip power supply circuit, establishes a USB data channel in a USB host mode, and establishes a DP-to-video channel in a DP input mode. The circuit realizes rapid peripheral identification and mode automatic switching based on hardware, and is simple in structure, low in cost, high in response speed and high in system stability.

The invention discloses a dual-optical-path keyboard with a silica gel elastic piece capable of shielding light. The dual-optical-path keyboard comprises the silica gel elastic piece and an FPC, and a plurality of chips are arranged on the FPC. And the chip is one of a full color control chip, a full load color control chip, a confluence color control chip, a load color control chip and a fantasy color control chip. The light-sensitive element is located under the silica gel elastic piece, the silica gel elastic piece is made of a light-transmitting color material and a light-shading color material, the GRB in the chip is an emission light source, one path of the GRB directly provides illumination for a key cap character, the other path of the GRB directly penetrates through the silica gel elastic piece to provide the emission light source for the light-sensitive element under the silica gel elastic piece, and one light source has two purposes. The invention provides the optical switch keyboard with serial-parallel hot standby, the communication circuit is simple, the reliability is high, a single single-sided FPC (Flexible Printed Circuit) can realize full-key no-impact and GRB indication, a keyboard MCU (Microprogrammed Control Unit) can communicate with the keyboard through a maximum 5PIN electrical network, and the optical switch keyboard can be widely applied to notebook computer production.

The invention discloses a selector unit for dynamic switching of a standard unit, a ring oscillator and a test structure. Wherein the selector unit is connected in parallel with standard units with different threshold voltages, driving capabilities and logic functions, and is matched with the first switch control circuit, so that flexible switching of the differentiated standard units is realized, and the static architecture limitation of a traditional test circuit is broken through; according to the ring oscillator, a selector unit is embedded into a closed oscillation loop of a standard unit chain, a time sequence path of multiple unit combinations is formed through dynamic configuration, and the delay superposition effect between mixing units in an actual circuit is effectively simulated; the test structure is based on the configurable characteristic of the ring oscillator, combines a pin sharing mechanism of the first control signal multiplexing module, realizes parallel test of multiple unit combinations in a single chip, and eliminates multi-chip separate test requirements, so that a high-efficiency and high-coverage standard unit delay detection system is realized under the constraint of hardware resources, and the test efficiency is improved. And a verification basis is provided for deviation analysis of the process simulation model.

An integrated circuit is provided for driving the gate of a GaN power switch transistor in a switching power converter. During a first portion of an on-time period for the GaN power switch transistor, the integrated circuit charges the gate through a relatively high pull-up resistance. During a second portion of the on-time period, the integrated circuit charges the gate through a relatively low pull-up resistance. During a first portion of an off-time period for the GaN power switch transistor, the integrated circuit discharges the gate through a relatively low pull-down resistance and then discharges the gate through a relatively high pull-down resistance in response a voltage of the gate falling below a threshold voltage.

A method of generating a coupling gate between qubits and a superconducting integrated circuit providing a pulse source are discussed. The method includes energizing a power line connected to a pulse source, applying a signal to a control line in communication with a coupler, the coupler in communication between the two qubits, and applying a second signal to a control line in communication with a resonator. The method further includes inducing a tone on a transmission line that selectively communicates with the resonator to bias the resonator, the resonator coupling a signal to the pulse source in combination with the power line, and applying a third signal to a pulse source control line in communication with the pulse source, the pulse source applying a pulse to the coupler in response to the third signal to couple the two qubits for a duration of the coupling gate.

The invention discloses a touch detection device for a household appliance, and the device comprises a piezoelectric induction sensor which is disposed at the inner side of a door of the household appliance, and is used for detecting a knocking event exerted on the outer side of the door; the control circuit board is installed on the inner side of the door and is separated from the piezoelectric induction sensor, the control circuit board communicates with the piezoelectric induction sensor, and the control circuit board comprises a signal conditioning circuit used for processing a detection signal output by the piezoelectric induction sensor; and the controller is suitable for judging whether the knocking event is a correct human finger knocking event or not according to the processed detection signal. The piezoelectric induction sensor and the control circuit board are separately mounted on the inner side of the door of the household appliance, so that the space in the household appliance is saved, and the mounting convenience and flexibility of the touch detection device are greatly improved.

The invention discloses a digital quantity output control circuit and method integrating overcurrent instantaneous protection and delay recovery functions. The circuit is mainly composed of a sampling module, a delay module, a voltage following module, an alarm module, an optical coupler isolation module and a typical digital output switch control module. When an over-current phenomenon is detected, the protection circuit can respond quickly, the circuit is cut off immediately to realize protection, and an alarm signal is output synchronously. Thereafter, the protection state will last for a preset delay time. During the period, the processor can monitor an alarm signal and output a circuit turn-off control signal according to the alarm signal. And after the delay time ends, the protection delay circuit automatically recovers to an initial state, and at the moment, the processor takes over signal output control according to the control logic. According to the invention, over-current instantaneous protection and delay recovery functions of the digital output circuit and smooth switching controlled by the processor are successfully realized, and safety risks caused by over-current faults are effectively avoided.

The invention relates to a passive wireless temperature sensor circuit, which comprises a transceiving antenna, an RF-DC rectifier circuit, a temperature sensing circuit and a backscatter circuit, the RF-DC rectifier circuit receives external radio frequency energy based on the transmit-receive antenna and then outputs direct current for power supply. The temperature sensing circuit comprises a complementary absolute temperature voltage generator and a ring oscillator; the complementary absolute temperature voltage generator comprises an MOS tube and generates CTAT voltage based on temperature characteristics of the MOS tube. The ring oscillator converts the CTAT voltage into an oscillation frequency signal of the ring oscillator and then outputs a square wave frequency signal with a negative temperature coefficient; the backscattering circuit backscatters the square wave frequency signal through the transceiving antenna; the CTAT key generation circuit built by the MOS tube generates CTAT voltage, a temperature frequency conversion chain is built through the CTAT voltage and the ring oscillator, temperature information is converted into frequency information of the oscillator, the power consumption of the temperature sensing circuit can be effectively reduced, and meanwhile the voltage coefficient of the CTAT voltage is increased by combining the temperature characteristic of the MOS tube.