46 results about "Turn on time" patented technology

The invention discloses a control circuit, a converter and a system, and relates to the field of integrated circuits, and the control circuit comprises a logic control module, a timing module and a timing expansion module. Outputting a first signal to an upper field-effect tube of the buck converter, wherein the first signal is used for starting the upper field-effect tube; the timing module is connected with the logic control module; the timing expansion module comprises a first switch, a second switch, a first current source, a first capacitor and a first comparator, one end of the first current source is connected with the first switch, the other end of the first current source is connected with the second switch, the positive input end of the first comparator and the first capacitor, and the output end of the first comparator is connected with the logic control module. And by arranging the timing expansion module, the starting time of the upper field effect transistor is prolonged, the load response speed is further improved, and the stability of the equipment is improved.

The invention discloses a PWM signal generation method, module and related device, and the method comprises the steps: sampling a comparison signal based on a sampling period, judging the size relation between the actual current and instruction current of a motor based on the comparison signal, selecting an upper switch tube of a driver or a lower switch tube of the driver based on a judgment result, and generating a PWM signal according to the upper switch tube or the lower switch tube. And judging whether the turn-on time of the selected switch tube reaches the minimum turn-on time, if so, generating an upper tube control signal and / or a lower tube control signal based on the judgment result, and if not, re-sampling the comparison signal based on the sampling period. According to the PWM signal generation method and module and the related device, only the actual current needs to be compared with the instruction current, and the analog circuit calibration difficulty is smaller. In addition, judgment on the turn-on time and the dead time of the switching tube is introduced, and the use safety of a switching device can be considered.

The invention provides a driving circuit with constant power tube turn-on and turn-off time, which belongs to the technical field of electronic device driving, and comprises a main path resistor link, the input end of the main path resistor link is connected with an inversion signal of a control signal, and the output end of the main path resistor link is connected with a grid electrode of a power tube; and the feedback loop is used for selecting one of the control signal and the power supply signal to be output as a gating signal under the action of the selection control signal, and controllably connecting the power supply signal to a voltage dividing node of the main path resistor link under the action of the gating signal. The beneficial effects of the invention are that through the arrangement of the feedback loop, the self-adaptive control of the opening or closing speed of the power tube can be realized, and the purpose of constant opening time of the power tube under different PVT conditions is achieved.

This application relates to a negative voltage control circuit, method, memory, and electronic device, belonging to the field of electronic circuits. The negative voltage control circuit includes: a voltage detection module and a control module; the voltage detection module is connected to the data line of the memory cell and is used to detect the voltage of the data line; the control module is connected to the voltage detection module and a negative voltage generating circuit, and the control module is used to control the negative voltage generating circuit to turn on when the voltage of the data line is lower than a preset voltage, so that the negative voltage generating circuit pulls down the voltage of the data line to a negative voltage, wherein the preset voltage is the voltage at which the memory cell can write data 0. This negative voltage control circuit can effectively detect the optimal turn-on time of the negative voltage generating circuit, effectively improving the write operation yield of the memory cell. Furthermore, the circuit structure is simple, the area is small, and costs are effectively saved.

The invention relates to the technical field of capacitor switching, and discloses a capacitor switching system and method, and the system comprises a main controller and a plurality of capacitor switching switches. The main controller is used for determining the expected turn-on time of each capacitor fling-cut switch at the current mains supply zero point time, sending a turn-on instruction to each capacitor fling-cut switch based on the expected turn-on time, and obtaining the actual turn-on time of the capacitor fling-cut switches; and the main controller is also used for determining the starting time error of the current capacitor fling-cut switch, determining the expected starting time of the capacitor fling-cut switch at the next mains supply zero point time according to the starting time error, and sending a starting instruction to the capacitor fling-cut switch based on the expected starting time at the next mains supply zero point time. According to the invention, the current expected starting time of the capacitor fling-cut switch can be calibrated, so that the capacitor can be accurately input at the voltage zero crossing point, and it is ensured that the capacitor fling-cut switch can still control the inrush current peak value within a relatively low range under the ten thousand secondary switching working condition.

A power controller and a control method for a power converter with soft turn-on and soft turn-off. The power converter includes an inductor element and a power switch for controlling an inductor current flowing through the inductor element. The power controller includes a voltage mode controller and a current mode controller. The voltage mode controller controls an on-time of the power switch based on a feedback signal and a sawtooth signal. The feedback signal is generated based on an output voltage of the power converter. The current mode controller controls the on-time based on a current limit signal and a current sense signal to limit the current sense signal. The current sense signal represents the inductor current. The current mode controller includes a limit signal generator for providing the current limit signal based on the feedback signal and a triangular wave signal and determining a soft turn-on time and a soft turn-off time. The limit signal generator increases the current limit signal over time during the soft turn-on time and decreases the current limit signal over time during the soft turn-off time.

This application belongs to the technical field of airborne transient electromagnetic detection, and specifically relates to a method and system for temperature control of an unmanned aerial vehicle battery for airborne transient electromagnetic. It includes: obtaining the turn-off time signal of the transmission current of the transmission system to synchronize the synchronous acquisition time signal of the receiving system, and obtaining the turn-on time signal of the transmission current of the transmission system; calculating the first time period between the turn-on time signal and the synchronous acquisition time signal; within the first time period, using a low-frequency alternating current signal as the driving signal of the heating circuit; in the second time period exceeding the first time period, using a high-frequency alternating current signal as the driving signal of the heating circuit. By means of staging and frequency division, the magnetic field introduced by temperature control is distinguished from the working frequency band of the airborne transient electromagnetic detection task, reducing the interference to the target signal.

The invention relates to a synchronous rectification turn-off control method and device adaptive to minimum turn-on time. The method comprises the following steps: detecting a voltage signal between a drain electrode and a source electrode of a synchronous rectification MOS (Metal Oxide Semiconductor) tube in a conducting state of the synchronous rectification MOS tube in a power supply circuit; when the voltage is greater than the set voltage threshold value, opening an adaptive filtering time window; the length Tf of the adaptive filtering time window is equal to mi < n > (Tf, max, max (Tf, min, alpha * D / fsw)); from the starting time of the adaptive filtering time window, monitoring whether the duration of the voltage signal greater than the set voltage threshold reaches the minimum duration threshold; generating a first effective turn-off signal when the duration reaches a minimum duration threshold; when timing reaches Tf from the starting time of the adaptive filtering time window, generating a second effective turn-off signal; and a turn-off driving control signal is generated according to the first effective turn-off signal and the second effective turn-off signal, and the synchronous rectification MOS tube is controlled to be turned off. According to the scheme, the stable work of the synchronous rectification MOS tube under various frequency conditions is ensured, and the operation reliability of the system is improved.

The invention discloses an LED display driving method and device, a chip, electronic equipment and a storage medium, and the method comprises the steps: receiving display data of a display frame, and obtaining a gray value according to the display data, wherein the total display time of one display frame comprises shadow elimination time, display time and pre-opening time; judging the gray value and a first threshold value; if the gray value is larger than or equal to the first threshold value, a highlight function is started, and the highlight function is to set at least part of pre-starting time in the display frame as display time. According to the LED display driving method and device, the chip, the electronic equipment and the storage medium, when it is judged that the gray value of the display data belongs to the high gray value, at least part of the pre-opening time is set as the display time, and therefore the brightness efficiency is improved.

An example includes: switching on and off a coil current at switch-on times and switch-off times specified by means of a clock signal; generating a PWM signal with a duty cycle representative of the inductance of the measuring coil with rising and falling PWM signal edges, triggered at the same time as the switching on or switching off of the coil current and triggered as soon as a value of the coil current reaches a specified trigger threshold, or both of which are triggered as soon as a value of the coil current reaches a specified trigger threshold; evaluating the PWM signal to determine the duty cycle and the inductance; detecting a steady-state maximum value of the coil current after switching on and before subsequently switching off the coil current; and specifying the trigger threshold depending on the detected steady-state maximum value of the coil current.

Various methods and circuital arrangements for reducing a turn ON time of a cascode amplifier are presented. According to one aspect, a configurable switching arrangement coupled to a cascode transistor of the amplifier shorts a gate of the cascode transistor to a reference ground during an inactive mode of operation of the amplifier. During an active mode of operation of the amplifier, the configurable switching arrangement couples a gate capacitor to the gate of the cascode transistor that is pre-charged to a voltage that is higher than a gate biasing voltage to the cascode transistor, which ensures that cascode transistor turns ON much quicker than the traditional method of grounding the cap, hence provide a final current flow through the cascode amplifier in a shorter time by not limiting the turn ON time of the input transistor. The gate biasing voltage is coupled to the gate capacitor via a resistor. A relationship between the pre-charged voltage, and minimum saturation voltages and threshold voltages of the transistors of the cascode amplifier is also provided.

The invention provides a constant starting time generation circuit which comprises a first RS trigger I1, a comparison signal control circuit, a first comparison signal generation circuit, a second comparison signal generation circuit, a reset signal control circuit, a test auxiliary circuit and a selector I2, and the second end of the test auxiliary circuit is connected to the setting end of the first RS trigger I1 through the selector I2. An output signal of the first RS trigger I1 is calibrated through the test auxiliary circuit and the reset signal control circuit; an output signal of a previous-stage circuit is connected to the setting end of the first RS trigger I1 through the selector I2, and the input delay of the reset end of the first RS trigger I1 is eliminated through dynamic adjustment of the reset signal control circuit. According to the invention, the foreground calibration mode is utilized to calibrate the resistance and capacitance errors, and the output delay of the comparator is dynamically adjusted and calibrated after entering the normal working mode, so that the accurate control of the constant starting time is realized, and the working frequency of the switching power supply is accurately controlled.

In a method for modifying a control deviation (RA) within the framework of a fixed-value control system of a controlled system (4) with integrating system behavior, a resting module (10) receives the vector control deviation (RA) as an input vector (EV) of input signals (E1-3) and maps this to an output vector (AV) of output signals (A1-3), wherein the resting module (10) is switchable as a system state (26) between a passive (PZ) and active state (AZ) and, in the passive state (PZ), outputs a zero signal as the output signal (A1-3) if the input signal (E1-3) lies within an assigned corridor (K1-3), and otherwise outputs the input signal (E1-3), and switches to the active state (AZ) if an input signal (E1-3) lies continuously within the corridor (K1-3) for a turn-on time (Tein), and the resting module (10) in the active state (AZ) from the input signal (E1-3) generates a test signal (P1-3) and outputs all output signals (A1-3) as zero signals,and switches to passive state (PZ) when a test signal (P1-3) continuously leaves its corridor (K1-3) for longer than a switch-off time (Taus). A rest module (10) with a computing unit (16) for executing the procedure contains an input (12) for the input vector (EV) and an output (14) for the output vector (AV). A control loop (2) with the controller (8) and a comparator (6) for outputting the control deviation (RA) contains the idle module (10) between comparator (6) and controller (8) and receives the control deviation (RA) from the comparator (6) and the controller (8) receives the output vector (AV) as modified control deviation (RM).

A display panel (100), a driving method, and a display device. The display panel (100) comprises a plurality of sub-pixels (1), wherein each sub-pixel (1) receives a first light-emission control signal (EM, EM1, EM2, PAM_EM, PAM_EM1, PAM_EM2). The display panel (100) at least comprises a first time (a1) and a second time (a2), the first time (a1) being different from the second time (a2), wherein the first time (a1) and the second time (a2) are respectively light-emission durations of different sub-pixels (1); or the first time (a1) and the second time (a2) are respectively turn-on moments of first light-emission control signals (EM, EM1, EM2, PAM_EM, PAM_EM1, PAM_EM2) for different sub-pixels (1); or the first time (a1) and the second time (a2) are respectively light-emission durations of the same sub-pixel (1) in different states; or the first time (a1) and the second time (a2) are respectively turn-on moments of a first light-emission control signal (EM, EM1, EM2, PAM_EM, PAM_EM1, PAM_EM2) for the same sub-pixel (1) in different states. The display panel (100), the driving method, and the display device improve the display uniformity.

This invention relates to the field of semiconductor and semiconductor manufacturing technology, specifically to a HEMT device for suppressing current collapse and its manufacturing method. The device includes a substrate with a nucleation layer, a buffer layer, a channel layer, and a barrier layer. The barrier layer has a source, a gate, and a drain. A P-GaN layer is disposed between the gate and the barrier layer. A storage layer is disposed between the source and the barrier layer. Passivation layers are disposed between the source and the gate, and between the gate and the drain. This invention discloses a HEMT device for suppressing current collapse. Through the storage layer configuration, when the device is off, the net negative charge in the pGaN charge storage layer below the source effectively accelerates the depletion of the 2DEG, reducing the turn-off time and lowering the device turn-off loss. When the device is on, the net negative charge in the storage layer decreases, which helps the 2DEG recover, reducing the turn-on time and lowering the turn-on loss.

The application discloses a kind of ray device working condition monitoring method, comprising: detecting the environmental radiation dose rate of ray device workplace;Detect the working current and / or working voltage of ray device;Detect the start time and stop time of the working current, and / or the start time and stop time of working voltage;Detect the state signal of shielding door opening and closing;Detect the opening time when the shielding door opens and the closing time when it closes;According to the environmental radiation dose rate, working current and the start time and stop time of the working current, and / or working voltage and the start time and stop time of the working voltage, shielding door opening and closing state signal, shielding door opening time when it opens and closing time when it closes, it is judged whether the working condition of the ray device is abnormal, and alarm when abnormal.The application also discloses a kind of ray device working condition monitoring system.The application can be used to monitor the working condition of ray device, and safety is good.

Embodiments of the present application provide a display panel and a driving method thereof, and a display device, and relate to the technical field of display, and are used for improving display uniformity of the display panel. The display panel comprises a plurality of sub-pixels; the sub-pixels receive a first light-emitting control signal; the display panel comprises at least a first time and a second time, and the first time is different from the second time; wherein, the first time and the second time are respectively light-emitting times of different sub-pixels; or, the first time and the second time are respectively turn-on times of the first light-emitting control signal of different sub-pixels; or, the first time and the second time are respectively light-emitting times of a same sub-pixel in different states; or, the first time and the second time are respectively turn-on times of the first light-emitting control signal of a same sub-pixel in different states.

The application is a digital-analog mixed synchronous rectification control method suitable for LLC resonant circuit. Firstly, the rising edge of the gate voltage of the main switch tube of the LLC main topology is detected in the state detection module. When the rising edge comes, the state of the counter in the state detection module is changed, so that the voltage sampling circuit detects the voltage across the synchronous rectification tube in the N main switch tube periods, N is 3 to 30, and the voltage after the integral operation processing of the output analog circuit is output. The voltage comparison module reads the output of the voltage sampling circuit and compares it with the initial value to adjust the duty cycle of the synchronous rectification tube in the next period. Finally, the adaptive synchronous rectification tube turn-off module turns off the rectification tube (SR2), and the turn-on time of the rectification tube is synchronized with the main switch tube (Q1) of the switching power supply. The technical problems of high component cost and low reliability existing in the existing LLC adaptive synchronous rectification scheme are solved.

A converter (1) for operating an LED load is provided. The converter (1) comprises an actively switched power factor correction, PFC, circuitry (104-112), having a control circuitry (2-4) for controlling a switch (105) of the PFC circuitry (104-112). The control circuitry (2-4) is configured to control a switch-on timing of the switch (105) such that an output voltage (113, Vbus) of the PFC circuitry (104-112) is feedback-controlled in accordance with a nominal value (201). In a discontinuous conduction mode, DCM, the control circuitry (2-4) is configured to control an actual value (204, Toff_act) of the switch-on timing of the switch (105) in one or more switching cycles to be a time of a valley of a voltage across the switch (105) succeeding a nominal value (302, Toff_nom) of the switch-on timing of a control algorithm implemented by the control circuitry (2-4). The control circuitry (2-4) is further configured to control the actual value (204, Toff_act) of the switch-on timing of the switch (105) in one or more subsequent switching cycles being subsequent to the one or more switching cycles to be a time of a valley of the voltage across the switch (105) preceding the nominal value (302, Toff_nom) of the switch-on timing. This reconciles valley switching and avoidance of visible light flicker.

A display device includes a display panel including a plurality of blocks, a data driver which provides data voltages to the display panel, and a controller which controls the data driver according to a temperature profile, stores a turn-off temperature profile of the display device, estimates a turn-on temperature profile at a turn-on time of the display device based on the turn-off temperature profile, a temperature change rate after a turn-off of the display device, and an elapsed time from a turn-off time of the display device to the turn-on time, and calculates the temperature profile based on the turn-on temperature profile and a temperature increase profile after a turn-on of the display device.

Arrangement for load- or cost-optimized release of an electrical load, comprising (a) a signal transmitter module with (a1) an interface for receiving a time series of an external control variable from the group: energy price, cost index, CO2 intensity, grid frequency deviation or power forecast, (a2) a memory for buffering the time series, (a3) ​​a processing unit that determines a continuous load release index from the time series, and (a4) an output stage that provides the load release index as an analog output signal that can be detected by a PLC analog input; and (b) a PLC with analog input that scales the analog output signal and, by means of a PLC program with hysteresis, minimum on time and minimum off time as well as time windows / calendar, generates a switching variable for controlling an actuator; wherein, in the event of invalidity of the analog output signal, a failsafe reaction defined in the PLC is triggered.

The invention relates to a device (1) with a control unit (2) and several separate subunits (3, 3', 3"). The subunits (3, 3', 3") require a switch-on time to transition from a switched-off state to a normal operating state. Upon receiving a switch-off command, a control unit (2) switches off those subunits (3, 3', 3") whose switch-on times are less than a maximum switch-on time value associated with a stability mode.

The present invention proposes a constant on-time generation circuit, comprising a first RS flip-flop I1, a comparison signal control circuit, a first comparison signal generation circuit, a second comparison signal generation circuit, a reset signal control circuit, a test auxiliary circuit, and a selector I2. The second end of the test auxiliary circuit is connected to the set end of the first RS flip-flop I1 via the selector I2, and the output signal of the first RS flip-flop I1 is calibrated via the test auxiliary circuit and the reset signal control circuit. The output signal of the previous-stage circuit is connected to the set end of the first RS flip-flop I1 via the selector I2, and the input delay of the reset end of the first RS flip-flop I1 is eliminated by dynamic adjustment of the reset signal control circuit. The present invention first calibrates resistance and capacitance errors using a foreground calibration mode, and then, after entering a normal operating mode, dynamically adjusts the output delay of the calibration comparator to achieve accurate control of the constant on-time, thereby accurately controlling the operating frequency of the switching power supply.

Method for controlling a lighting system, wherein the method comprises Retrieving, by a processor (120) and from a memory (134) of a lighting module (130), device information indicating properties of the lighting module (130), wherein the device information comprises (i) a plurality of parameters of a lighting element of the lighting module (130) and (ii) a maximum constant for the lighting element, wherein the maximum constant indicates a relationship between at least two parameters of the lighting element; Received from a user a desired parameter value for one of the parameters from the multitude of parameters; Determine, by the processor (120), a test constant from the desired parameter value; Determine, using the processor (120) and from the test constant and the maximum constant, that the desired parameter value is an acceptable parameter value; and Control of a power source by the processor (120) to provide electrical current to the lighting module (130) according to the desired parameter value; where the maximum constant also indicates a radiation risk group classification.

Circuit diagram, including: a memory field or array (104, 400) comprising a plurality of memory cells; a path (414, 417) configured to supply a voltage for biasing one memory cell (MC) of the plurality of memory cells, wherein the path comprises: a variable resistance circuit (416) configured to: before switching on the memory cell (MC), an associated resistor is set to a high resistance level; and in response to an end time of an initial power-on period, to adjust the associated resistance from a high resistance level to a low resistance level, wherein the initial power-on period extends from a power-on time (t2) to the end time (t3) which precedes a read result acquisition event of the read operation.

Various methods and circuital arrangements for reducing a turn ON time of a cascode amplifier are presented. According to one aspect, a configurable switching arrangement coupled to a cascode transistor of the amplifier shorts a gate of the cascode transistor to a reference ground during an inactive mode of operation of the amplifier. During an active mode of operation of the amplifier, the configurable switching arrangement couples a gate capacitor to the gate of the cascode transistor that is pre-charged to a voltage that is higher than a gate biasing voltage to the cascode transistor, which ensures that cascode transistor turns ON much quicker than the traditional method of grounding the cap, hence provide a final current flow through the cascode amplifier in a shorter time by not limiting the turn ON time of the input transistor. The gate biasing voltage is coupled to the gate capacitor via a resistor. A relationship between the pre-charged voltage, and minimum saturation voltages and threshold voltages of the transistors of the cascode amplifier is also provided.

This invention discloses a PWM signal generation method, module, and related apparatus. The PWM signal generation method includes: sampling a comparison signal based on a sampling period; determining the magnitude relationship between the actual current and the commanded current of the motor based on the comparison signal; selecting either the upper or lower switching transistor of the driver based on the determination result; determining whether the current on-time of the selected switching transistor has reached the minimum on-time; if so, generating an upper transistor control signal and / or a lower transistor control signal based on the determination result; otherwise, re-sampling the comparison signal based on the sampling period. According to the PWM signal generation method, module, and related apparatus of this invention, only the actual current and the commanded current need to be compared, making analog circuit calibration easier. Furthermore, the determination of the switching transistor's on-time and dead time is introduced, which can ensure the safety of the switching devices.

A user equipment (UE) 500, comprises: a transceiver 520; a memory 530; and a processor 510 communicatively coupled to the transceiver and the memory, where the processor is configured to: operate in a discontinuous reception mode including time interleaved ON times of the discontinuous reception mode and OFF times of the discontinuous reception mode; and determine whether to measure a portion of a positioning signal based on timing of the portion of the positioning signal relative to at least one of a first one of the ON times of the discontinuous reception mode or a first one of the OFF times of the discontinuous reception mode

The embodiment of the invention provides a synchronous rectification controller and a related control method, which are used for controlling a synchronous rectification switch. The synchronous rectification switch is provided with a control end and a detection end. The synchronous rectification controller comprises a starting time recorder and a differential driver. The turn-on time recorder is used for recording the previous turn-on time of the synchronous rectification switch according to a detection signal on the detection end and determining a first regulation and control time period and a second regulation and control time period. The first regulation and control period occurs before the second regulation and control period. According to the detection signal, the differential driver drives the control end to regulate the detection signal at a first target voltage and a second target voltage respectively in the first regulation time period and the second regulation time period. The first target voltage is different from the second target voltage.