Abstract: 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.

Abstract: 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.

Abstract: The amplifier comprises instantaneously interruptible power source (I2PS) for producing a precise AC output voltage. A continuous mode I2PS can be built using only 7 power components, including two inductors and an output capacitor. The I2PS can instantaneously interrupt the correction and become idle. The inductors each attain a corrective current and provide a return voltage. Two switches are separately coupled in series with the inductors for selectively applying the respective corrective currents between the power supply and the output capacitor. Two diodes limit the return voltages. A converter converts the supply voltage or an internal voltage into an internal supply current. A fine amplifier can employ two low power transistors to rapidly deliver a fine current to the output capacitor. This dramatically reduces output noise and improves accuracy. The converter and the fine amplifier can be combined or used separately. The I2PS having unity gain is most accurate and requires a simple preamplifier.

Abstract: The amplifier comprises instantaneously interruptible power source (I2PS) for producing a precise AC output voltage. A continuous mode I2PS can be built using only 7 power components, including two inductors and an output capacitor. The I2PS can instantaneously interrupt the correction and become idle. The inductors each attain a corrective current and provide a return voltage. Two switches are separately coupled in series with the inductors for selectively applying the respective corrective currents between the power supply and the output capacitor. Two diodes limit the return voltages. A converter converts the supply voltage or an internal voltage into an internal supply current. A fine amplifier can employ two low power transistors to rapidly deliver a fine current to the output capacitor. This dramatically reduces output noise and improves accuracy. The converter and the fine amplifier can be combined or used separately. The I2PS having unity gain is most accurate and requires a simple preamplifier.

Abstract: This instantaneously interruptible power source (I2PS) produces a precise AC output voltage. The I2PS can be built using only 7 power components, including an output capacitor. Moreover, currents applied thereto are unidirectional and independently developed. In the conventional switching power amplifier or uninterruptible power source, an output inductor continuously delivers a current to an output capacitor. A precise correction is simply impossible since, at the end of every switching cycle, the correction is either insufficient or continues while no longer required. This includes even most sophisticated class-D amplifiers. By contrast, the I2PS can instantaneously interrupt the correction and become idle. Without transformation, the output voltage can exceed supply voltages. An inductive block comprises at least one inductor and/or transformer for providing a return voltage. A switch or switches selectively apply a DC supply voltage or voltages to the inductive block.

Abstract: The switching power supplies convert AC or DC input voltage into a DC output voltage. Conventional topologies are implemented, wherein power factor correction and/or square-wave switching at resonant transition is accomplished. In a front-end, rectified line voltage is applied to an inductor that attains line current. A diode limits voltage at a front-end output to a holdup voltage stored in a capacitor. A switch selectively applies the holdup voltage to the front-end output. In a DC/DC power supply, a switch selectively applies the input voltage to an inductor that attains a current. A transformer provides primary and secondary voltages in response to the current. A voltage across the inductor is limited to the primary voltage that is stored in a capacitor. The secondary voltage is rectified and applied to another capacitor that provides the DC output voltage. No output inductor is required. Furthermore, a forward power supply employs a single output diode.

Abstract: Switching power amplifier and uninterruptible power system each can be built using only 6 power components, including battery and output capacitor. Moreover, line isolation is accomplished. An inductive block includes an inductor and/or a transformer, and provides a return voltage. A first switch selectively applies at least one supply voltage to the inductive block. A first rectifier limits the return voltage, e.g. to the battery voltage. Another capacitor stores a DC voltage and the series-coupled output capacitor provides the output voltage. A sum of the capacitor voltages is positive even at negative peak of the output voltage. A second switch and a second rectifier apply the sum to the inductive block. The output voltage and a current charging the battery can be pure sinusoidal.

Abstract: An uninterruptible power supply (UPS) comprises a low voltage converter (02); a coupled inductor (60) comprising a first inductor (63) coupled to the battery, a second inductor (61) coupled to a first output terminal of a rectifier, and a third inductor (62) coupled to a second output terminal of the rectifier; a snubber circuit; and a high voltage inverter (01).

Abstract: Low noise DC/DC switching power supply employs a transformer, a main switch and an auxiliary switch. The auxiliary switch merely reflects the switching of the main switch and has lower voltage ratings. A maximum noise suppression is accomplished when both switches have the same current ratings. The power supply takes advantage of some resonant properties but operates in forward and/or flyback square wave modes. When the main switch is turned off, a leakage energy stored in the transformer is delivered to a capacitor. Subsequently, both switches are turned on, wherein the capacitor voltage is applied across the primary winding of the transformer. When the capacitor voltage is reduced to a desired value, the auxiliary switch turns off, wherein the primary voltage is reduced to the input voltage. The difference between both primary voltages is thus regulated. The EMI/RFI performance of the power supply is dramatically improved. A discontinuous mode allows uninterrupted input current at any time.

Abstract: An uninterruptible power supply (UPS) includes a transformer, a low voltage converter (02), a rectifier, and a high voltage inverter (01). The low voltage converter comprises a battery, a first switching device (Q3), a second switching device (Q4), and first drive circuits (41, 42). The high voltage inverter (01) includes first and second load terminals adapted to be coupled across a load in an emergency situation; an output capacitor (C); a third switching device (Q1) and a fourth switching device (Q2), and second drive circuitry (43, 44) for driving the third and fourth switching devices from conducting to non-conducting states and vice versa so as to produce a quasi-sinusoidal output voltage waveform across the load terminals.

Abstract: This push-pull switching power supply outperforms its counterparts. Each switch has twice the voltage ratings. However, only two main switches have current ratings as all four switches of the full-bridge power supply. That is only one half the current ratings of both switches of the half-bridge power supply. The input voltage is applied to a center tap of transformer's primary winding. The main switches are coupled thereacross for alternately applying the primary current to ground. Two diodes apply the leakage current of the transformer to a single capacitor. One or two auxiliary switches apply the primary current to the capacitor, whereby the leakage energy stored therein is immediately returned to the transformer. The auxiliary switches operate only a mere fraction of the time and thus their peak rather than continuous current ratings matter. The efficiency is significantly increased as a passive snubber network is eliminated and a reverse energy flow is prevented.

Abstract: The switching power supply attains sinusoidal input current even at a low level of the input voltage. In one embodiment, a node voltage appears between the input terminal and node. A grounded capacitor stores an intermediate voltage. A grounded inductor attains a current. One diode applies the current to the capacitor. Another diode applies the current to the node. A switch selectively applies the intermediate voltage to the node. A boost type converter converts the node voltage into the output voltage. Another switch can be coupled in series with the input terminal to prevent the inrush current.

Abstract: The switching power supply attains sinusoidal input current even at a low level of the input voltage. One capacitor is grounded and stores an intermediate voltage. One switch selectively applies the intermediate voltage to a node. A grounded diode is coupled to the node. An inductor is coupled to the node for attaining a current. Another switch selectively applies the current to the input terminal. A rectifier applies the current to the output terminal. Another capacitor is coupled between the output terminal and the one capacitor for storing and providing the output voltage.

Abstract: The logic ensures a smallest achievable propagation delay, lowest achievable supply voltage and low power consumption. Silicon or GaAs can be used. The gain of each gate is preferably low. A local supply voltage E depends on temperature and is provided for each gate or plurality of gates fabricated on a single chip. The main supply voltage V-, whose variations are insignificant, may be as small as -1 V or -0.5 V if bipolar transistors or FETs are used respectively. An inverter may comprise merely one transistor with the source coupled to E. A or a second transistor is coupled between the drain of the first transistor and ground. A binary input voltage is applied to the gate of the first transistor. A binary output voltage appears at the drain and is independent of temperature. An n-input NOR gate is established simply by adding n-1 transistors in parallel with the first transistor.

Abstract: The switching power supply has high output power, high efficiency and fixed or variable output voltage. The input voltage may be AC or DC. Preferably, the input current is sinusoidal. Reduced peak currents of switches result in best possible line and component utilizations at any time.In one embodiment, a first converter has an output for converting DC input voltage into a base voltage. A first capacitor is coupled between the DC input voltage and first converter output for storing the base voltage. A second converter is coupled to the first converter output for determining the output voltage. A second capacitor filters the output voltage. Both converters are referenced to ground. A diode applies the DC input voltage to the output.