摘要:
A first capacitor is provided between a first power supply line and a second power supply line. A charge/discharge circuit includes a second capacitor provided between the first power supply line and the second power supply line and a first switch connected in series to the second capacitor on the side of the first power supply line. A booster circuit boosts the rectified voltage from a diode rectifier to charge the second capacitor. A current blocking part is provided on the first power supply line or the second power supply line between the first capacitor and the second capacitor and blocks flowing of the current from the second capacitor to the first capacitor.
摘要:
A drive circuit is provided for reducing conducted electromagnetic interference provided by a power line to a motor controller. The drive circuit includes an EMI filter having first and second EMI filter input terminals, and first and second EMI filter output terminals. The first input terminal is configured to be coupled to a first AC line output and the second input terminal is configured to be coupled to a second AC line output. The drive circuit includes a rectifier portion having first and rectifier input terminals coupled to the first and second EMI output terminals, respectively. The drive circuit includes at least two series-coupled filter capacitors after the rectifier portion and a PFC choke coupled at a first end to one of the EMI filter output terminals and to one of the first and second rectifier input terminals, and at a second end between the series-coupled filter capacitors.
摘要:
A circuit arrangement, in particular a circuit arrangement of an electric vehicle for inductive power transfer to the vehicle includes a pick-up arrangement and at least one variable compensating arrangement. The variable compensating arrangement includes a capacitive element, a first switching element and a second switching element. The first switching element and the second switching element are connected in series, and the series connection of the first and the second switching element is connected in parallel to the capacitive element of the variable compensating arrangement. Also disclosed is a method of operating the circuit arrangement and a method of manufacturing the circuit arrangement of the electric vehicle and the electric vehicle.
摘要:
An inverting apparatus and a control method thereof are provided. The inverting apparatus includes an inverting circuit, a capacitor, and a control circuit. The inverting circuit receives a DC input power and is configured to convert the DC input power into an AC output power, wherein an AC output current of the AC output power is preset to a preset output current. The capacitor is connected to an output terminal of the inverting circuit. The control circuit is coupled to the inverting circuit and is configured to control a power conversion of the inverting circuit, wherein the control circuit superimposes a preset capacitor compensation current of which the phase leads to the preset output current on the preset output current, so as to control the inverting circuit to adjust the AC output current and provide the adjusted AC output current to a power grid.
摘要:
In one embodiment, a controlling circuit configured for an AC/DC converter that receives an AC voltage supply, can include: (i) a compensation signal generator configured to generate a compensation signal that follows an error between an output signal from the AC/DC converter and an expected converter output signal during a first time interval of a half period of the AC voltage supply, the compensation signal being substantially constant during a remaining time interval of the half period; and (ii) a controlling signal generator configured to generate a controlling signal based on the compensation signal to maintain the output signal as substantially consistent with the expected converter output signal.
摘要:
A passive power factor correction (PFC) circuit is disclosed. It converts an AC input voltage into at least one DC output voltage. A diode bridge and a diode pair rectify the AC input voltage and provide first and second rectified voltages, respectively. A resistor applies the second rectified voltage to a first capacitor that stores the first voltage. A diode applies the first voltage to an inductor. The inductor applies the first rectified voltage to an output capacitor that stores the DC output voltage. The passive PFC circuit is intended to expand commonly used full-wave bridge rectifier and following storage capacitor. It can replace an input circuit, including low pass filter, in many applications even if improved power factor is not required. The passive PFC specifically targets size of the inductor while avoiding any switching, and maintaining power factor that challenges active PFC circuits. Early prototypes reached power factor of 0.99 while driving a 100 W load.
摘要:
A three-phase reactor power saving device, comprising: a first capacitor set, connected electrically to a three-phase AC power supply, to store electric energy; a reactor set, connected electrically to said first capacitor set, to convert said electric energy into AC self-induced energy; a three-phase transformer, connected electrically to said reactor set, to boost said AC self-induced energy into boosted AC self-induced energy; a second capacitor set, connected electrically to said three-phase transformer, to store said boosted AC self-induced energy; a rectifier circuit, connected electrically to said three-phase transformer, to rectify current of said boosted AC self-induced energy into a DC current; a power regulating capacitor, connected electrically to said rectifier circuit; and a first DC reactor and a second DC reactor, connected electrically to said rectifier circuit, to output first DC self-induced energy and second DC self-induced energy to said load, to raise power saving efficiency.
摘要:
A Light Emitting Diode (LED) lighting circuit has a passive valley-fill type power factor correction (PFC) circuit. A boost converter stage is coupled to the PFC circuit.
摘要:
A harmonic input current reduction and power factor correction circuit for three phase, power supplies. The circuit includes passive elements including a series inductance and capacitor connected between each AC line of a three phase voltage source, and each input phase of the uncorrected power supply. The inductance and capacitor are designed and chosen to meet linearity and volt ampere requirements to achieve total harmonic current levels of less than 10%, and power factors greater than 0.98. This is achieved with less than 1% loss in line operating input voltage range and overall efficiency of greater than 99.5%. Further, the dynamic response of a circuit to power supply load transient demands is limited in voltage overshoot or undershoot effects.
摘要:
A power source system including power-factor modifying circuits to modify a power factor of supplied electric power, a time difference circuit to output start signals for instructing the power-factor modifying circuits to start an operation to the power-factor modifying circuits at specified time intervals, and a control circuit to supply the electric power to the power-factor modifying circuit to start the power-factor modifying circuit when the power-factor modifying circuit acquires the start signal output from the time difference circuit.