Abstract: A gaming system and an operation method of a gaming server thereof are provided. The gaming system includes multiple player devices and the gaming server. The gaming server establishes a network connection with the player devices. In response to one of the player devices initiating a game, the gaming server sends a game notification to the player devices according to a player list. The gaming server determines a common throughput between the player devices based on a response of each of the player devices to the game notification.

Abstract: The present invention relates a low power control device using a sleep timer, and more particularly, to a low power control device using a controllable sleep timer which disables each component of a circuit while discharging an output voltage Vo using a control signal of a sleep timer in which a width of an OFF signal is larger than a width of an ON signal in a light load state and sequentially enables each component of the circuit while charging the output voltage in a predetermined order to minimize power consumption according to a loading level of a load.

Abstract: An electronic device includes a circuit board that manages supply of electricity to the electronic device. The circuit board includes an integrated circuit and an external capacitor coupled to a supply terminal of the circuit board. During a startup operation of the integrated circuit, the integrated circuit supplies a first charging current to charge the capacitor to a supply voltage value. The circuit board includes a boost circuit that receives a portion of the first charging current and outputs a second charging current that augments charging of the capacitor. The second charging current is an amplification of the first charging current. The integrated circuit enables operation of the electronic device after the capacitor is charged to the supply voltage value.

Abstract: A method for controlling an electronic switching unit for supplying electric power to an inductive power load, includes the following steps: activating an initial filter capacitor by connecting it between the electric power supply of the electronic unit and ground, and deactivating the other capacitors of the bank of filter capacitors; measuring the current flowing through this initial filter capacitor; if this current is above a predetermined nominal current threshold, activating an additional filter capacitor by connecting it between the electric power supply of the electronic unit and ground, in parallel with the initial filter capacitor.

Abstract: A control device for a vehicle includes a semiconductor switch, and opens and closes a connection between a capacitor connected to one end of the semiconductor switch and an on-board battery connected to another end of the semiconductor switch by turning ON/OFF the semiconductor switch. The control device includes: a wiring for applying a drive voltage for turning ON the semiconductor switch; a drive switch for short-circuiting the wiring to turn OFF the semiconductor switch; a Zener diode having an anode connected to the one end of the switching circuit, and a cathode connected to the wiring; a voltage detection unit detects a voltage at the one end of the switching circuit; and a control unit that controls the drive switch from OFF to ON, and determines whether or not the semiconductor switch is defective by comparing the voltage detected by the voltage detection unit with a threshold value.

Abstract: A UHV-LV interface circuit that is capable of the following, among other things: 1) starting up a primary controller of a power converter circuit with a precisely controlled startup charging profile; 2) performing pulse-based line-voltage sensing with reduced power and improved sensing accuracy; and 3) discharging a capacitor, e.g., class-X2 capacitor, with a stable supply voltage for the controller. The UHV-LV interface circuit can use a single UHV device, such as a single depletion-mode transistor, e.g., field-effect transistor (FET).

Abstract: A flyback power converter circuit includes a transformer, a blocking switch, a primary side switch, a primary side controller circuit and a secondary side controller circuit. The transformer is coupled between an input voltage and an internal output voltage in an isolated manner. The blocking switch controls the electric connection between the internal output voltage and an external output voltage. In a standby mode, the internal output voltage is regulated to a standby voltage, and the blocking switch is controlled to be OFF; in an operation mode, the internal output voltage is regulated to an operating voltage, and the blocking switch is controlled to be ON, such that the external output voltage has the operating voltage. The standby voltage is smaller than the operating voltage, so that the power consumption of the flyback power converter circuit is reduced in the standby mode.

Abstract: A power supply circuit is configured to supply power to a load based on power generated by a power generation element. The power supply circuit includes an input capacitor configured to store the power generated by the power generation element, a voltage conversion circuit including an enable terminal and being configured to output, to the load, an output voltage obtained by converting an input voltage between both ends of the input capacitor, and a starter circuit configured to apply a voltage to the enable terminal of the voltage conversion circuit. The starter circuit is configured to start up the voltage conversion circuit by applying an enable voltage to the enable terminal of the voltage conversion circuit. The voltage conversion circuit is configured to output the output voltage in an operating state after starting up when the input voltage is equal to or higher than a first threshold.

Abstract: Aspects of hybrid-current-mode switching-cycle control are described. In one embodiment, a peak current mode is selected to control a switching power cell. The switching power cell is in an arm of a phase leg of a modular multilevel converter. The phase leg includes an upper arm and a lower arm, and the switching power cell includes a capacitor and at least one switch. At least one switch control signal switches the switching power cell according to a peak current mode based on at least one arm current boundary crossing identified for the arm.

Abstract: Provided is a semiconductor device that has a configuration provided with: a driving unit for driving an upper switching element and a lower switching element according to a control signal for controlling the driving of the upper switching element and the lower switching element, which are connected in series to constitute a bridge circuit; an insulating unit having an insulating transformer; and a package for sealing at least a part of the insulating unit and the driving unit. The insulating unit transmits a signal corresponding to the control signal to the driving unit side while insulating the signal.

Abstract: A voltage mode controller applied to short-circuited protection of a power converter includes gate control signal generation circuit and control circuit. The control circuit generates control signal to make the gate control signal generation circuit generate predetermined signal to power switch of the primary side of the power converter before the power converter starts up and when supply voltage is greater than first reference voltage, enables short-circuited protection after predetermined enabling period of the predetermined signal if detection voltage is less than second reference voltage during the predetermined enabling period. The short-circuited protection makes the power converter not start up, and after the power converter starts up, the short-circuited protection is enabled to turn off the power converter if the detection voltage is less than the second reference voltage for de-bounce time and compensation voltage is greater than third reference voltage.

Abstract: An AC capacitor is coupled to a totem-pole type PFC circuit. In response to detection of a power input disconnection, the PFC circuit is controlled to discharge the AC capacitor. The PFC circuit includes a resistor and a first MOSFET and a second MOSFET coupled in series between DC output nodes with a common node coupled to the AC capacitor. When the disconnection event is detected, one of the first and second MOSFETs is turned on to discharge the AC capacitor with a current flowing through the resistor and the turned on MOSFET. Furthermore, a thyristor may be simultaneously turned on, with the discharge current flowing through a series coupling of the MOSFET, resistor and thyristor. Disconnection is detected by detecting a zero-crossing failure of an AC power input voltage or lack of input voltage decrease or input current increase in response to MOSFET turn on for a DC input.

Abstract: The radiated noise of a semiconductor device is conveniently evaluated, and the radiated noise of an apparatus equipped with the semiconductor device is estimated. An evaluation method including: making a semiconductor device that is connected parallel to a load by a load cable, perform a switching operation; measuring common-mode current flowing through the load cable during the switching operation; and outputting an evaluation benchmark for radiated noise based on the common-mode current, and an evaluation apparatus are provided.

Abstract: This disclosure describes techniques for controlling switching regulator switching operations. The techniques include selecting a given one of a plurality of clock signals based on a control signal. The techniques further include generating, by the switching regulator, an output voltage from an input voltage by controlling one or more switches according to a switching frequency that corresponds to the selected given one of the plurality of clock signals. The techniques further include varying the switching frequency of the switching regulator by changing a value of the control signal, used to select the given one of the plurality of clock signals, according to a given one of a plurality of refresh rate control signals that corresponds to the selected given one of the plurality of clock signals having respective values that correspond to respective ones of the plurality of refresh rate control signals.

Abstract: A communication apparatus operates with a supply voltage of a power and transmits a sensor value with a digital communication method using consecutive frames. In the communication apparatus, a data source unit is configured to generate a frame using a data of a sensor value processed by a signal processing unit. A switching unit is configured to perform a signal switching to permit a transmission circuit to perform a re-transmission of re-transmitting a signal including the sensor value stored in a memory in response to a restoration of the power after an instantaneous power interruption. A frame monitoring unit is configured to monitor a status of a frame transmission and determine a frame at the occurrence of the instantaneous power interruption. The sensor value to be re-transmitted is determined based on information of the frame determined by the frame monitoring unit at the occurrence of the instantaneous power interruption.

Abstract: A power supply device is provided with a diode rectifier circuit having an input connected to an AC power source, the output of the diode rectifier circuit producing a rectified voltage; a capacitor connected to the diode rectifier to be charged by the rectified voltage; and a controller configured to receive as input a detection signal representing a charging current flowing into the capacitor, the controller being further configured to calculate a voltage frequency, a cycle, or a power voltage phase of the AC power on the basis of the detection signal. At least one of the following is used to detect the charging current flowing into the capacitor and produce the detection signal: a photocoupler; an amplifier circuit including a shunt resistor and an operational amplifier; and a current transformer.

Abstract: A wireless power reception apparatus including a bridgeless rectifier in a wireless power transfer (WPT) system for an electric vehicle (EV) may include: a bridgeless rectifier configured to rectify power transferred from a reception coil and to supply a direct current to a battery mounted in the EV; and a controller configured to control operation of the bridgeless rectifier. The bridgeless rectifier may include at least one switch and at least one diode connected to the at least one switch.

Abstract: An AC/DC converter is operative to receive, via AC input terminals, an AC input signal and to transform the AC input signal into a DC output signal. The AC/DC converter comprises a first DC discharge circuit coupled to AC input terminals. The controller comprises a second DC discharge circuit having a controllable switching element for switching the second DC discharge circuit on and off. The second DC discharge circuit is operative to receive a DC discharge current from the first DC discharge circuit; logic associated with the AC/DC converter repeatedly: receives a DC sense signal from the second DC discharge circuit and determines, based on the value of the DC sense signal within a predetermined measurement time period, loss of the AC input signal. In response to determining loss of the AC input signal, the logic controls activation of the second DC discharge circuit depending on the DC sense signal.

Abstract: A controller for a system includes a first control section and a second control section. The system includes an electrical actuator, a switch switching the electrical actuator between a power supply state and a power cutoff state, and a drive section driving the switch. The drive section outputs, to the switch, a drive signal to drive the switch based on a command signal for switching of the switch. The first control section determines a switch state based on the command signal, and the second control section determines a switch state based on the drive signal. At least one of the first control section and the second control section determines the electrical actuator to be in the power supply state on the condition that the first control section determines the switch to be in the power supply state, and the second control section also determines the switch to be in the power supply state.

Abstract: A control circuit having power limit for controlling an AC-DC voltage converter. The control circuit includes a first sensing circuit having an auxiliary winding used to sense a voltage on an inductive element of the converter to generate a first sensing signal, a second sensing circuit used to sense the current flowing through the inductive element to provide a second sensing signal, and a power limit circuit. The power limit circuit generates a power indication signal indicative of the input power of the converter based on the first sensing signal and the second sensing signal. When the power indication signal is larger than a power threshold, a controllable switch of the converter is turned off.

Abstract: A system includes a first transistor having a first control input and first and second current terminals. The first current terminal couples to an input voltage node. A second transistor has a second control input and third and fourth current terminals. The third current terminal couples to the second current terminal at a first node. The fourth current terminal couples to an output voltage node. A drive circuit is configured to charge a capacitor maintain the first transistor in an off state responsive to a negative voltage on the input voltage node, and, responsive to a negative voltage on the input voltage node, to cause the charge from the capacitor to be used to turn off the first transistor. The system provides a voltage to a load coupled to the output voltage node.

Abstract: In a converter system having an AC/DC converter, and a method for operating a converter system, in which the terminal of the AC/DC converter on the direct-voltage side feeds a series circuit, which has a braking resistor and a controllable switch, the terminal of a DC/AC converter, on the direct-voltage side being connected in parallel to the series circuit. The output signal of a voltage-acquisition device is supplied to an evaluation unit, which generates a control signal for the controllable switch. The evaluation unit includes a device for determining the electric power supplied to the braking resistor. The output signal of the device is supplied to a controller, and the controller controls its set value toward the output signal of the device.

Abstract: A power transfer device includes a first power supply node, a second power supply node, and an oscillator circuit configured to convert an input DC signal across the first power supply node and the second power supply node into an AC signal on a differential pair of nodes comprising a first node and a second node in response to a control signal. The oscillator circuit includes a regulated power supply node and an active shunt regulator circuit configured to clamp a peak voltage level across the regulated power supply node and the second power supply node to a clamped voltage level. The clamped voltage level is linearly related to a first voltage level on the first power supply node.

Abstract: The invention relates to a DC voltage network having a plurality of sections (1) which can be connected together and separated from one another individually or in groups via a respective switch element (5). A pre-charging circuit (10) has diode groups (11), a switch device (12), an energy transmission path (13), and a controller (14). Each of the sections (1) of the DC voltage network is coupled to the energy transmission path (13) via at least one respective diode group of the diode groups (11). The energy transmission path (13) is consistently the same for the diode groups (11). The controller (14) transmits a control signal (S) to the switch device (12) in order to pre-charge sections (1), and the switch device (12) thereby switches the energy transmission path (13) for all of the sections (1) coupled to the energy transmission path (13) so as to be conductive.

Abstract: An exemplary embodiment of the disclosure provides a reference voltage generation circuit which includes a unit switch circuit and a voltage output circuit. The unit switch circuit is configured to receive a control voltage and generate a plurality of base voltages on a detection point inside the reference voltage generation circuit. The voltage output circuit is coupled to the unit switch circuit and is configured to modify a reference voltage for generating a specific voltage according to the base voltages. Therefore, an influence on the reference voltage due to process variation can be reduced.

Abstract: A reference signal generator includes a voltage reference, an amplifier coupled to the voltage reference, and a precharge circuit coupled to the amplifier. The voltage reference is configured to generate a constant voltage. The amplifier is configured to receive the constant voltage from the voltage reference and generate a regulating primary output signal and a non-regulating secondary output signal. The precharge circuit is configured to charge a noise reduction capacitor with the non-regulating secondary output signal.

Abstract: The present disclosure relates to a head-wearable hearing device comprising a multiple-output switched capacitor DC-DC converter. Said multiple-output switched capacitor DC-DC converter comprises a switch matrix comprising a plurality of individually controllable semiconductor switches and a plurality of flying capacitors connected between respective sets of circuit nodes of the switch matrix. A controller is connected to respective control terminals of the plurality of individually controllable semiconductor switches of the switch matrix to configure first and second converter sections to form first and second converter topologies, respectively.

Abstract: A method and apparatus for start-up of a voltage source converter (VSC) which is connected to an energized DC link (DC+, DC?). The VSC is connected to a first AC network via a first transformer and an AC isolation switch, the AC isolation switch being coupled between the first transformer and the AC network. The method involves using an auxiliary AC power supply to generate an AC supply to energize the first transformer with the AC isolation switch open. The VSC is then started, with a VSC controller using the AC supply generated by the auxiliary AC power supply as a reference for controlling the VSC. The auxiliary AC power supply may also be used to supply power to at least one VSC load, such as the controller and/or an auxiliary load such as a cooling system. Once the VSC is started the isolation switch 204 can be closed.

Abstract: A power conversion method comprising: charging a plurality of energy storage devices of a power converter from an input power source; and sequentially coupling and decoupling energy storage devices of the plurality of energy storage devices to an output. Charging the plurality of energy storage devices comprises maintaining at least two of the plurality of energy storage devices at substantially different potentials.

Abstract: A method for controlling operations of a memory device, the memory device and the controller thereof, and the associated electronic device are provided. The method can comprise: before a voltage-drop event regarding a driving voltage occurs, mapping a rising reference voltage and a falling reference voltage to a first reference voltage and a second reference voltage, respectively; when the voltage-drop event occurs, pausing at least one access operations to a non-volatile (NV) memory, and mapping the rising reference voltage and the falling reference voltage to another first reference voltage and another second reference voltage, respectively; and when the voltage-drop event ends, mapping the rising reference voltage and the falling reference voltage to the first reference voltage and the second reference voltage, respectively.

Abstract: A control circuit for a programmable power supply is provided. It comprises a reference generation circuit generating a voltage-reference signal and a current-reference signal for regulating an output voltage and an output current of the power supply. A feedback circuit detects the output voltage and the output current for generating a feedback signal in accordance with the voltage-reference signal and the current-reference signal. A switching controller generates a switching signal coupled to switch a transformer for generating the output voltage and the output current in accordance with the feedback signal. A micro-controller controls the reference generation circuit. The micro-controller, the reference generation circuit, and the feedback circuit are equipped in the secondary side of the transformer. The switching controller is equipped in the primary side of the transformer. The control circuit can achieve good performance for the programmable power supply.

Abstract: The present invention provides an apparatus for managing power within a voltage regulating circuit of a battery-powered hearing aid device includes an input terminal of a voltage regulator that receives an input voltage supplied by a battery. An output terminal of the voltage regulator provides an output voltage to a hearing aid terminal that is electrically connected to one or more electrical components of the hearing aid device. A sensing terminal of the voltage regulator senses an electrical connection between the charging device is and charging contacts of the voltage regulating circuit. The voltage regulator is configured to reduce a magnitude of the input voltage when the magnitude of the input voltage exceeds an input voltage threshold to generate the output voltage having a magnitude that is less than a maximum output voltage.

Abstract: An electronic system includes two power supplies to supply an operating voltage to a switching power converter. The first power supply, referred to as a start-up power supply, includes a first source follower transistor to conduct a start-up current for a controller and supply an operating voltage for the controller. The controller controls operation of the switching power converter. A second power supply, referred to as an auxiliary power supply, includes a second source follower transistor to conduct a steady-state operational current for the controller and supply an operating voltage for the controller. In at least one embodiment, once the second power supply begins supplying the operating voltage to the controller, the start-up power supply automatically ceases supplying the start-up current to the controller.

Abstract: An integrated circuit used for a switching converter has a power supply circuit for providing a power supply voltage, and a control circuit. The switching converter has a switching circuit converting a DC input voltage into an output signal. The power supply circuit has a protection circuit, an UVLO unit and a current source coupled to a power supply capacitor. The protection circuit detects whether the DC input voltage is at a brown-in state. The UVLO unit generates a lock out signal by comparing the power supply voltage with a upper threshold voltage and a lower threshold voltage. The lower threshold voltage is selectively limited to one of a first value or a second value based on the detection. The second value is less than the first value. The current source provides the power supply voltage under the control of the lock out signal.

Abstract: A reference signal generator includes a voltage reference, an amplifier coupled to the voltage reference, and a precharge circuit coupled to the amplifier. The voltage reference is configured to generate a constant voltage. The amplifier is configured to receive the constant voltage from the voltage reference and generate a regulating primary output signal and a non-regulating secondary output signal. The precharge circuit is configured to charge a noise reduction capacitor with the non-regulating secondary output signal.

Abstract: A method for testing an electric system and an electric system comprising a first inverter (10) and one or more second inverters (11, 12, 1N), and control means (40) configured to start the first inverter (10), provide and sustain with the first inverter (10) an AC voltage of a predetermined magnitude and a predetermined frequency at an AC output of the first inverter, start at least one second inverter (11, 12, 1N), and supply with the first inverter (10) reactive power to the started at least one second inverter (11, 12, 1N).

Abstract: Ideal switch bridgeless PFC topologies are presented with the purpose of increasing the efficiency in power factor correction circuits and inverter applications. The topology also leverages the new GaN switches that are available. This patent offers also a very good solution for the Zero crossing distortion problem improving greatly the THD both in power factor correction and inverter applications.

Abstract: Generally speaking, a timing circuit helps determine diode conduction time of an LLC converter. In some examples, the circuit includes an LLC converter having a secondary side and a timing circuit, the timing circuit coupled to the LLC converter on the secondary side. The timing circuit includes a first branch, second branch, gate, and microprocessor. The gate is configured to receive an output of the first branch's comparator and a blanking signal from the second branch. The microprocessor is configured to receive, from the gate, a signal and determine, based at least in part on the signal, a diode conduction time for the LLC converter.

Abstract: A controller for a switching power converter is provided with a single detection pin through which the controller monitors whether the switching power converter is connected to an AC mains. Should a voltage for the detection pin indicate that the switching power converter is disconnected from the AC mains, the controller asserts the detection pin voltage to trigger a bleeder circuit to discharge an X class capacitor.

Abstract: The present technology relates to a control apparatus, a control method, a cable, an electronic apparatus, and a communication apparatus that are capable of increasing the variation of a connection mode of an electronic apparatus to which a predetermined cable such as a USB cable can be connected. An electronic apparatus receiving a baseband signal of a baseband to start initialization processing for causing the electronic apparatus to be in a state of being capable of establishing connection or to turn on or off a power source based on detection results of power of a modulation signal obtained by frequency-converting the baseband signal into a signal of a predetermined frequency band higher than the baseband is controlled. The present technology can be applied to a cable connected to an electronic apparatus to which a cable capable of supplying a power source by bus power such as a USB cable.

Abstract: In an embodiment, a power-supply controller includes a control circuit, a drive circuit, and a signal-drop-reducing circuit. The control circuit is configured to generate a drive signal having a duty cycle, and the drive circuit is configured to cause a phase circuit of a power supply to generate, in response to the drive signal, an output signal having a magnitude. And the signal-drop-reducing circuit is configured to disable the driver circuit in response to the duty cycle corresponding to a signal magnitude that is lower than the magnitude of the output signal. For example, where a power supply has a non-zero residual output signal (e.g., output voltage) on its output node after the power supply is deactivated, such a power-supply controller can reduce or eliminate a drop in the residual output signal caused by, or that would be caused by, a restarting of the power supply.

Abstract: A soft start amplifier provides a soft-start function that controls a battery charging current in a feedback loop charging circuit by selecting the lowest voltage between a soft start voltage and an error derived control voltage. The lowest voltage is used as a control signal for controlling the battery charging current in the feedback loop charging circuit. The error voltage is a difference between a voltage proportional to the charging current and a voltage proportional to the target charging current while the soft start voltage is a voltage configured to ramp up with time. Using the lower voltage of the error voltage and the soft start voltage reduces the inrush current that may occur when the error derived control voltage spikes to the supply voltage in an attempt to correct the initial difference between the target charging current and a measured charging current.

Abstract: Device and method for energy harvesting using a self-oscillating power-on reset start-up circuit. The device for energy harvesting comprises a start-up circuit for generating self-oscillation and initial boosting of an input voltage from an energy source during a start-up phase; a main boost circuit for boosting the input voltage during a steady state phase; a clock generator circuit for generating clock signals which control voltage boosting of the main boost circuit during the steady state phase; and a switching circuit coupled to the start-up circuit, the main boost circuit and the clock generator circuit for switching powering of the clock generator circuit between the start-up circuit and the main boost circuit such that the clock generator circuit is powered by only one of the start-up circuit and the main boost circuit at any point in time.

Abstract: An electronic system and method include a controller to actively control power transfer from a primary winding of a switching power converter to an auxiliary-winding of an auxiliary power supply. The switching power converter is controlled and configured such that during transfer of power to the auxiliary-winding, the switching power converter does not transfer charge to one or more secondary-windings of the switching power converter. Thus, the switching power converter isolates one or more secondary transformer winding currents from an auxiliary-winding current. By isolating the charge delivered to the one or more secondary-windings from charge delivered to the auxiliary-winding, the controller can accurately determine an amount of charge delivered to the secondary-windings and, thus, to a load.

Abstract: One example includes a power supply system. The system includes a power stage comprising at least one power switch that is periodically activated during an on-time of a duty-cycle based on a switching signal to generate an output voltage at an output. The system also includes a switching controller configured to generate the switching signal based on an amplitude of a capacitor voltage at a control node associated with a capacitor that defines the on-time of the duty-cycle as a function of the capacitor being periodically charged. The switching controller includes a pre-bias stage configured to apply a pre-bias charge to the capacitor via an offset voltage prior to a start of the on-time to pre-charge parasitic capacitance associated with the power supply system prior to the start of the on-time.

Abstract: A control circuit for a step-up converter includes a soft start module configured to control states of N transistor pairs of the step-up converter, where N is an integer greater than two. A driver module is in communication with the soft start module and configured to generate a first signal when N transistor pairs of the step-up converter are ready to switch. A first charging circuit is configured to charge (N-1) capacitors of the step-up converter to an input voltage of the step-up converter in response to the first signal and to generate a second signal when charging is complete. A second charging circuit is configured to sequentially charge the (N-1) capacitors of the step-up converter to (N-1) predetermined voltage values in response to the first signal and the second signal and before operation of the step-up converter begins.

Abstract: A pre-charging circuit of inverter is disclosed, the pre-charging circuit of inverter including a relay arranged between an output node of the rectifier and an input node of the DC-link capacitor, and a pre-charging resistor arranged between an output node of the rectifier and an input node of the inverter unit, whereby a degree of freedom for PCB design can be obtained.

Abstract: An integrated circuit (IC) for controlling the discharge of a capacitor coupled across first and second input terminals of a power converter circuit, wherein the first and second terminals for receiving an ac line voltage. The IC includes a switching element coupled across the first and second input terminals and a detector circuit. The detector circuit including first and second comparators that produce first and second output signals responsive to a zero-crossing event of the ac line voltage. The first and second output signals being used to generate a reset signal coupled to a timer circuit responsive to the zero-crossing event. When the reset signal is not received within a delay time period, the timer circuit outputs a discharge signal that turns the switching element on, thereby discharging the capacitor.

Abstract: The present disclosure provides a method for controlling soft start of a switching rectifier, which comprises: acquiring an external environmental parameter of the switching rectifier and a power supply characteristic parameter of an object to be powered, establishing a voltage start strategy and/or a current start strategy for the switching rectifier according to the external environmental parameter and the power supply characteristic parameter, and controlling a voltage and/or a current of the switching rectifier to start to a full-load voltage and/or a full-load current according to the voltage start strategy and/or the current start strategy. The present disclosure further provides a device for controlling soft start of a switching rectifier. The technical scheme of the present disclosure is able to provide a suitable voltage and/or current start approach for a switching rectifier according to power supply requirements of an object to be powered and operating environment of the switching rectifier.

Abstract: Disclosed is a short-circuit protection circuit for a voltage sampling resistor of a primary side converter, comprising a high voltage power transistor, a high voltage starting resistor, a first voltage dividing resistor of a port VDD, a second voltage dividing resistor of the port VDD, an NMOS transistor, a diode, a first comparator, a second comparator, a third comparator, a time delay circuit, a filter, a first logic circuit, a second logic circuit, a current supply, a first AND gate and a first inverter. The chip of the present disclosure is capable of correctly and effectively detecting whether the sampling resistor is shorted or not before the chip works normally, thereby avoiding the risk of damaging the chip by large current from the voltage feedback port FB due to turn-on of the switching transistor when the upper voltage sampling resistor is shorted, and greatly reducing the input power.