41results about How to "Reduce overshoot voltage" patented technology

A switching regulator converts an input voltage to a predetermined voltage and outputs the predetermined voltage to a load through an output terminal. The switching regulator includes a first switching element, a second switching element, a control switching circuit part, and a smoothing circuit. When a first operating mode in which a PFM control is performed and a voltage from the output terminal becomes a first voltage is shifted to a second operating mode in which a PWM control is performed and the voltage from the output terminal becomes a second voltage larger than the first voltage, the control switching circuit part increases the voltage from the output terminal stepwise progressively from the first voltage to the second voltage while performing the PWM control.

The invention relates to a groove-type anode fast recovery diode with bipolar Schottky control and a manufacturing method thereof. The diode includes a cathode metal, Above the cathode metal there isan N-type intrinsic region, Above the N-type intrinsic region there is an anode metal, the cathode metal is provided with a lightly doped N-type region and a heavily doped N-type region spaced apart from each other, the bottom of the lightly doped N-type region is in Schottky contact with the cathode metal, A heavily doped P-type region and a lightly doped P-type region are arranged between the N-type intrinsic region and the anode metal, and the upper surface of the heavily doped P-type region is lower than the upper surface of the lightly doped P-type region, so that a groove-type anode region is formed, and the lightly doped P-type region is in Schottky contact with the anode metal. The manufacturing method of the groove-type anode fast recovery diode with bipolar Schottky control is characterized in that Schottky contacts of an anode surface and a sidewall can be simultaneously formed by one-step etching.

The invention discloses a display device, a source electrode drive circuit, and a control circuit for the source electrode drive circuit. The source electrode drive circuit comprises a digital-analog conversion module which is used for converting a digital signal into an analog voltage; an amplification module which is used for amplifying the analog voltage under the control of a switching signal; and an output module which is connected between the amplification module and an output end, and is used for providing a source electrode drive signal for a pixel unit. The output module comprises a plurality of parallel control units, and the control units are sequentially connected according to a sequence from the big conduction resistance to the small conduction resistance. Compared with the prior art, the source electrode drive circuit can effectively reduce the overshoot effect of the circuit, and reduce the noise of the circuit.

A method pixel driving method of an organic light emitting diode (OLED) display and an apparatus thereof are provided. The method comprises the following steps. First, a pixel unit is reset to a predetermined voltage in a reset time period. After that, a frame period is divided into two driving time periods so that the pixel unit is finally charged to a pixel voltage. The charging process of the pixel unit is that the pixel unit is charged to a ground level in a first driving time period, and then the pixel unit is charged to the pixel voltage in a second driving time period.

The invention discloses a soft starting circuit applied in a buck type direct current (DC)-DC switch power supply. The soft starting circuit mainly resolves the problem that overshoot voltage and surge current exist in the existing starting circuit, and static power consumption is too large. The starting circuit comprises a frequency converter circuit, a control circuit and a current-voltage conversion circuit. The first output end of the frequency converter circuit is connected with the control circuit to output a soft starting ending signal OVER, and the second output end of the frequency converter circuit si connected with a current-voltage conversion circuit to output digital signals F1-F7. The first output end of the control circuit is connected with the frequency converter circuit to output a clearing signal clr, the second output end and the third output end of the control circuit are connected with the current-voltage conversion circuit to respectively output a digital signal F8 and a digital signal XF8, and the current-voltage conversion circuit outputs voltage signals VSS. The soft starting circuit adopts the current-voltage conversion circuit, improves output voltage stability, reduces static power consumption, shortens domain area, reduces cost and can be used for simulating an integrated circuit.

The invention discloses a power semiconductor module packaging structure, which is characterized by comprising a substrate, a shell, a power semiconductor module subunit and an auxiliary terminal, wherein the shell is connected with the substrate in a fastened mode; the power semiconductor module subunit is arranged in accommodating space formed by the shell and the substrate and is used for forming a topology control circuit structure, the power semiconductor module subunit comprises a plurality of lining plates arranged on the substrate at intervals, the two oppositely arranged lining platesare connected through a main power terminal and a module-level bonding wire, and the top of the main power terminal extends out of the top of the shell; and the auxiliary terminal is used for introducing a driving signal into the power semiconductor module subunit, a bottom pin of the auxiliary terminal is connected with the lining plate, and the top of the auxiliary terminal extends out of the top of the shell. Thus, the heat dissipation efficiency of the power semiconductor module can be improved, parasitic inductance or resistance parameters are balanced, the process consistency is improved, the loss is low, and the reliability is good.

The invention provides an efficient field effect tube driving circuit which is used for driving a switch power field effect tube. The field effect tube driving circuit comprises a work power supply, a driving signal generating circuit, a delay driving circuit and a delay circuit, wherein the driving signal generating circuit, the delay driving circuit and the delay circuit are connected with one another in sequence and further connected to the switch power field effect tube; the driving circuit comprises a slow disconnecting circuit and a rapid disconnecting circuit; the delay driving circuit comprises a first phase inverter, a second phase inverter and a voltage comparator; the first phase inverter provides driving signals to the slow disconnecting circuit, and the second phase inverter provides driving circuit signals to the rapid disconnecting circuit; the voltage comparator is positioned in front of the second phase inverter, and when driving signals of the inverted input end of the voltage comparator rises to be higher than one reference voltage, the rapid disconnecting switch is disconnected, and only is the slow disconnecting circuit connected; and until the first phase inverter and the second phase inverter are connected, the slow disconnecting circuit is disconnected.

The invention discloses an asymmetric voltage stabilizing circuit used for NAND FLASH. The asymmetric voltage stabilizing circuit comprises a bias module, an error magnification module and an output module. An output end of the bias module is connected with an input end of the error magnification module such that external input voltage is converted into first bias voltage, second bias voltage, third bias voltage and fourth bias voltage and inputting the above into the error magnification module. An output end of the error magnification module is connected with an input end of the output module, which is used for amplifying differential signals based on the first bias voltage, the second bias voltage, the third bias voltage and the fourth bias voltage. A folding-type amplifier structure is adopted by the error magnification module, a differential output stage of which adopts an asymmetric structure. The times of differential output is at least two. The output module is used for receiving differential amplification signals inputted by the error amplification module and outputting the differential amplification. The asymmetric voltage stabilizing circuit used for NAND FLASH has following beneficial effects: an asymmetric folding-type cascade structure is adopted by the error magnification module such that less overshoot voltage is generated on the same power consumption.

The invention discloses a linear voltage regulator circuit without overshoot voltage at the output end. The positive input end of an operational amplifier OP3 is connected with a reference voltage VREF1, and the output end of the operational amplifier OP3 is connected with the G end of a transistor PMOS5; the S end of the transistor PMOS5 is connected with a power supply voltage VDD; the D end of the transistor PMOS5 is connected with a resistor R6; after the resistor R6 is connected with a resistor R7, the R7 is grounded; the negative input end of the operational amplifier OP3 is connected to a connecting line of the resistor R6 and the resistor R7; the D end of the transistor PMOS5 is connected with the positive input end of a comparator OP4; a reference voltage VREF2 is input into the negative input end of the comparator OP4, and the output end of the comparator OP4 is connected with the G end of a transistor NSMOS8; the D end of the transistor NSMOS8 and the D end of the transistor PMOS5 are connected to an output voltage Vout; and the S end of the transistor NMOS 8 is grounded. According to the invention, the comparator OP4 and a discharge MOS tube NMOS 8 are added on the basis of a typical linear voltage regulator, so that the overshoot voltage of the output end of the circuit of the linear voltage regulator can be effectively reduced on the premise of not changing the transient characteristics of the linear voltage regulator.

The invention relates to a device and a method for processing peak voltage of a winch frequency conversion speed adjusting device. The device comprises diodes D1-D12, resistive elements R1-R13, capacitors C1-C2 and voltage-stabilizer tubes Z1-Z10. By reducing a change rate dv/dt of output voltage of a frequency converter, overshoot voltage at a motor end caused by an overlong driving cable is reduced, insulation of a motor is protected, bearing current is reduced, service life of the cable and the motor is prolonged, temperature of the motor is reduced, noise of the motor is reduced, electromagnetic interference is reduced, and system reliability is improved.

The invention discloses a method for reducing overshooting voltage in an active filter, which is characterized in that a horn mouth charging mode is used in the secondary charging process of a storage capacitor in an active filter from the operating voltage (540v) of the active filter to 800v, wherein the horn mouth charging mode comprises the following steps: after receiving a starting signal, a DSP (digital signal processor) implements a 20s soft-startup horn mouth strategy on the sent command current, i.e. after the actual command current is calculated, the current is multiplied by a coefficient which is more than zero and less than 1 and is then sent to a current tracking control circuit, wherein the coefficient gradually increases from zero to one within 20 seconds, so that the command current is also gradually increased. By using the horn mouth charging mode, the method disclosed in the invention greatly reduces the overshooting voltage in the active filter, thereby ensuring the normal operation of the active filter.

The invention provides an input voltage feedforward apparatus and method. The method includes steps: detecting a voltage value of an inductor in a first-stage transformation topology in a secondary control two-stage transformation topology; determining an input voltage value of a secondary control two-stage transformation topology power supply according to the voltage value of the inductor; and performing input voltage feedforward according to the input voltage value of the power supply. According to the apparatus and method, the problem of difficult realization of input voltage feedforward for the two-stage transformation topology is solved, and the effect of substantially reducing an over-charging voltage during rapid change of the input voltage of the switch power supply with the two-stage transformation topology is achieved.

The invention discloses a bidirectional thyristor and an electronic product. The bidirectional thyristor comprises a substrate; a first trap and a second trap which are formed on the substrate, wherein the first trap and/or the second trap are/is provided with a trigger area/a trigger area used for carrier emission. The electronic product comprises the bidirectional thyristor. The technical schemedisclosed by the invention can realize that overshoot voltage is formed as low as possible before the bidirectional thyristor is started.