Abstract: A boost power conversion circuit includes an inductor, a first switch module, a second switch module, a first unilateral conduction component, a second unilateral conduction component, a flying capacitor, an upper bus capacitor, a lower bus capacitor, and a third unilateral conduction component. The power supply, the inductor, the first switch module, and the second switch module are connected in series to form a loop. The first unilateral conduction component, the second unilateral conduction component, the upper bus capacitor and the lower bus capacitor are connected in series. The flying capacitor is electrically connected between a reverse cut-off end of the first unilateral conduction component and a forward conduction end of the second unilateral conduction component. The third unilateral conduction component is configured to clamp a voltage stress of the second switch module to a lower-bus voltage.

Abstract: A surge protection circuit protection circuit includes a first series-connected line formed by at least two TVSs connected in series. One end of the line is connected to a positive terminal, and another is connected to a negative terminal. A second series-connected line is formed by at least one TSS. One end is connected between the at least two TVSs in the first series-connected line, and another end is grounded. The first line is connected in parallel to a protected circuit. When a differential-mode surge voltage appears at the ends of the first line, a voltage of a backend connection circuit is clamped to a first value. When a common-mode surge voltage appears at the two ends of the first line to the ground end, respectively, voltages to ground of the positive terminal and the negative terminal are reduced to a second value.

Abstract: Methods, apparatus, systems and articles of manufacture are disclosed to reduce switching losses occurring in power converters. An example a converter including an input voltage node and an output voltage node, a controller coupled to the converter, and a compensation network coupled to the converter and to the controller, the compensation network adapted to conduct a current to the converter in response monitoring a first voltage at the input voltage node being a threshold difference than a second voltage at the output voltage node.

Abstract: The invention relates to an inverter having an intermediate circuit capacitor, the connections of which are connected to supply lines for current supply and to a switching device which includes a plurality of half-bridges, wherein the intermediate circuit capacitor has a prespecified intermediate circuit capacitance, the magnitude of which is such that a ripple voltage which is formed in the supply lines by switching processes in the switching device is reduced to a prespecified maximum ripple voltage under prespecified operating conditions. For the purpose of reducing differential-mode interference, the invention proposes that a plurality of intermediate circuit capacitors which are connected in parallel are provided, wherein a sum of the capacitances of the plurality of intermediate circuit capacitors corresponds to the intermediate circuit capacitance.

Abstract: An electrical power supply system for a programmable logic controller, including: a first electrical power supply module configured to operate in a master mode to deliver at least one electrical supply voltage to the programmable logic controller; a second electrical power supply module configured to operate in a slave mode to deliver the electrical supply voltage to the programmable logic controller in event of failure of the first electrical power supply module; a control module configured to temporarily control switching of the first electrical power supply module to the slave mode and switching of the second electrical power supply module to the master mode; and a test module configured to test the second electrical power supply module when the second electrical power supply module is switched to the master mode.

Abstract: In an example, a system comprises a boost power factor correction (PFC) converter including a thermistor, an inductor, and a transistor coupled to a common node. The system also comprises a PFC controller coupled to the common node. The PFC controller includes a comparator coupled to a threshold voltage source and to a non-control terminal of the transistor; a first flip-flop coupled to the comparator and to a control terminal of the transistor; a zero current detector coupled to the inductor; a timer coupled to the comparator and to the zero current detector; a second flip-flop coupled to the timer and to the control terminal of the transistor; an AND gate coupled to the first and second flip-flops; a third flip-flop coupled to the second flip-flop and to the control terminal of the transistor; and a fourth flip-flop coupled to the AND gate and to the control terminal of the transistor.

Abstract: There is provided a configuration of a switching control circuit for use with a switching power supply which generates an output voltage from an input voltage, the switching control circuit having an intermittent operation mode where an operation period in which a switching element of the switching power supply is switched and a pause period in which the switching element is not switched are repeated. The switching control circuit includes a prohibition part configured to prohibit starting a next operation period until a predetermined period of time elapses from a time that a current operation period starts, in the intermittent operation mode.

Abstract: A transport and storage container of plastic for a filling material, having an inner container of polyethylene which is produced in the blow-molding method and which has a single-layer wall structure. The inner container is accommodated by an outer container, which is open at the top and which contains at least one layer of electrically conductive plastic. The outer lateral surface of the inner container is wrapped with an electrically dissipative flexible material, wherein at least one electrically conductive tab covers at least part of the top side of the inner container.

Abstract: A boost DC-DC switching converter architecture is provided, with a spread spectrum technique working in pulse skip mode, and a fixed frequency clock reference, comprising a high side switch and a low side switch, controlled by a voltage or current mode control loop operating in a Pulse Width Modulation (PWM) mode, and having a pulse skip mode. The switching converter comprises an inductor, connected between an input voltage terminal and the high side switch, and also connected to the low-side switch, and a random delay generator, where the random delay generator randomly varies a time for entering, or exiting, or both entering and exiting pulse skip mode, and varies a time where the high side switch is turned off in pulse skip mode.

Abstract: The invention proposes a high-voltage direct current cut-off device, comprising: in series, a cut-off device and a current limiter; an accumulation line in parallel with the current limiter, an oscillating circuit, in parallel with the cut-off apparatus, comprising an oscillation control switch and having an inductance wherein the accumulation line includes at least two accumulation capacitors, and in that the oscillation line extends from a branch connection point of the accumulation line situated between the two accumulation capacitors, determining a secondary segment of the accumulation line connected to the main conduction line between the current limiter and the main cut-off apparatus so as to form part of the oscillating circuit.

Abstract: A control method, which is applied to a conversion circuit including at least one bridge arm and an inductor, the bridge arm including an upper semiconductor switch and a lower semiconductor switch connected in series, and one end of the inductor being connected to a midpoint of the bridge arm, includes: detecting a direction of current of the inductor when a scram event occurs in the conversion circuit; turning on the upper semiconductor switch and turning off the lower semiconductor switch when the direction of current of the inductor is a first direction, wherein the first direction is the direction when the current flows from one end of the inductor to the midpoint of the bridge arm; and turning off the upper semiconductor switch and turning on the lower semiconductor switch when the direction of current of the inductor is a second direction.

Abstract: A power converter includes a multiple-winding transformer. The multiple-winding transformer provides an electromagnetic link between an input side and an output side of the power converter. An inductor is arranged on at least one of the input side and the output side of the power converter in parallel with the multiple-winding transformer. At least one first capacitor is arranged on the input side of the power converter in parallel with the multiple-winding transformer and the inductor. At least one second capacitor is arranged on the output side of the power converter in parallel with the multiple-winding transformer. The inductor, the at least one first capacitor, and the at least one second capacitor define a parallel resonance tank. A first plurality of switching devices is arranged on the input side. A second plurality of switching devices is arranged on the output side.

Abstract: A fast response amplifier circuit includes a pre-stage circuit and an output stage circuit. The pre-stage circuit generates a control signal according to a difference between a first input signal and a second input signal. The output stage circuit generates an output signal at an output node according to the control signal. The output stage circuit includes: a power transistor controlled by a driving signal to generate the output signal; a voltage positioning transistor operates according to the output signal to steer a first portion and a second portion of a bias current; an overshoot detecting circuit detecting an overshoot of the output signal to generate an overshoot indicating signal; and a first overshoot suppressor which generates a first overshoot suppressing signal according to the overshoot indicating signal to adjust a conduction resistance of the power transistor to suppress an overshoot of the output signal.

Abstract: A first circuit generates and outputs a transmission signal to a first end and a second end of a first coil in response to variation in logical value of an input first signal. A detection circuit detects a voltage signal generated at each of a first end and a second end and outputs a second signal which reflects the first signal based on a result of detection. A control circuit controls a voltage to be applied across opposing ends of each of a first diode and a second diode of a first rectifier circuit and a voltage to be applied to opposing ends of each of a third diode and a fourth diode of a second rectifier circuit.

Abstract: To provide a power supply circuit for fiber laser oscillator use capable of reducing the size of a fiber laser oscillator. A power supply circuit for fiber laser oscillator use comprises: a rectifier circuit unit capable of receiving input of a voltage having a particular value; and a power supply unit to which the rectifier circuit unit is connected. The rectifier circuit unit is one rectifier circuit unit selectable from multiple rectifier circuit units capable of receiving inputs of voltages having different values. Each of the rectifier circuit units includes a power factor correction circuit for adjusting a power factor at 1.

Abstract: A power supply apparatus and a control method thereof are provided. Power conversion is performed according to a switching signal group to provide an output voltage and an output current. An error value between the output voltage and a reference voltage is multiplied by a proportional parameter to obtain a proportional result. The error value is multiplied by an integration parameter to obtain a first calculation value which is then accumulated over time to obtain an integration result. When a slope of the output current is greater than a reference slope and a slope of the output voltage is negative, the slope of the output voltage is multiplied by a differential parameter to obtain a second calculation value which is then added to the integration result over time. A duty cycle of the switching signal group is adjusted according to the sum of the proportional result and the integration result.

Abstract: A current differential protection method for a self-adaptive half-wavelength line based on a time-difference method. Since an electrical distance of half-wavelength power transmission is long, after a fault occurs, there is an obvious time difference between the actuation times for protecting starting elements at two sides of a line. According to the principles of wave propagation, the position of a fault point can be determined by means of a difference between the actuation times for protecting the starting elements at the two sides of the line. By means of taking the fault point as a differential point, a current value at the differential point can be obtained according to a long line equation by means of the voltage and current at protection-mounted positions at the two sides of the line, and a differential current is then calculated.

Abstract: The invention is related to a method of initiating a regenerative converter (1) and corresponding converter (1) including a line bridge (2) and a machine bridge (3), which are interconnected via a DC intermediate circuit (8A, 8B). The method comprises charging, through the line bridge (2) and while the machine bridge (3) remains inactive, the DC intermediate circuit (8A, 8B) to a target voltage (14) higher than peak value of the mains voltage (13).

Abstract: A switching power supply device includes a switching transistor, a sense resistor, a transformer, an optocoupler, and a current limiting feedback circuit. The switching transistor is controlled to be turned on and turned off. The sense resistor is configured to generate a sense voltage when the switching transistor is turned-on. The transformer includes a primary winding to which an input voltage is applied when the switching transistor is turned-on, a secondary winding is configured to supply an output voltage to a load, and an auxiliary winding that is configured to detect the output voltage. The optocoupler is configured to generate first and second optocoupler currents corresponding to the output voltage. The current limiting feedback circuit is configured to generate first, second, and third feedback currents using a voltage of the auxiliary winding, the first, second, and third feedback currents being in inverse proportion to the output voltage.

Abstract: A COT control circuit used for realizing current sharing in multi-phase DC-DC converter. The multi-phase DC-DC converter has N switching circuits, N controllers, and a trimming current generator receiving N switching voltage signals of the N switching circuits to generate N trimming current signals. The N trimming current signals are respectively sent to the N controllers to regulate on time of at least one controllable switch of each of the N switching circuits so as to finally realize current sharing in the multi-phase circuits.