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Feedforward controlled envelope modulator and feedforward control circuit thereof,Power Converter and Driving Method Thereof,Switching power supply circuit

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3 results about "Switched current" patented technology

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Feedforward controlled envelope modulator and feedforward control circuit thereof

ActiveUS20110273235A1Stable output currentImprove efficiencyGain controlPower amplifiersSwitched currentAudio power amplifier

The present disclosure illustrates a feedforward controlled envelope modulator and a feedforward control circuit thereof. The feedforward controlled envelope modulator comprises a linear amplifier circuit, a switching amplifier, and a feedforward control circuit. The linear amplifier circuit amplifies an input voltage signal, so as to output an output voltage signal to a load node. The switching amplifier receives a comparison signal, and outputs a switching current to the load node according to the comparison signal. The feedforward control circuit comprises a duplicate linear amplifier circuit and a hysteresis comparator. The duplicate linear amplifier circuit amplifies the input voltage signal, so as to output a reference voltage signal, wherein an amplifying gain of the duplicate linear amplifier circuit is identical to an amplifying gain of the linear amplifier circuit. The hysteresis comparator compares the output voltage signal and the reference voltage signal, so as to output the comparison signal.

Feedforward controlled envelope modulator and feedforward control circuit thereof

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Owner:IND TECH RES INST

Power Converter and Driving Method Thereof

ActiveUS20090231894A1Ac-dc conversion without reversalConversion with intermediate conversion to dcSwitched currentControl signal

In a power converter, a primary coil receives an input voltage, and a switch includes a first electrode, a second electrode coupled to the primary coil, and a control electrode. An output unit includes a secondary coil, and outputs an output voltage. The primary coil and the secondary coil form a transformer, and the input voltage is converted to the output voltage by the transformer. A controller receives a sensing voltage corresponding to a switch current flowing between the first electrode and the second electrode of the switch, detects a valley point of a voltage between the first electrode and the second electrode of the switch based on the sensing voltage, and transmits a control signal to the control electrode of the switch in accordance with the valley point,

Owner:SEMICON COMPONENTS IND LLC

Switching power supply circuit

InactiveCN103299527ASuppress beepEfficient power electronics conversionApparatus with intermediate ac conversionElectricitySwitched current

A switching power supply circuit (101) is provided with a first rectifier circuit (102) for converting AC to DC; a switching operation unit (20); a switching transformer (103) having a primary winding to which a switched current is supplied and a secondary winding for inducing power in response to the current; a second rectifier circuit (30) for rectifying the power induced in the secondary winding; and a control circuit (40) for changing, in each mode, the ratio of current flowing through a photo coupler (107) to the output voltage from the second rectifier circuit (30) so as to suppress the noise from the switching transformer while in standby mode and in power-on mode.

Owner:PANASONIC CORP

3 results about "Switched current" patented technology

Feedforward controlled envelope modulator and feedforward control circuit thereof

Power Converter and Driving Method Thereof

Switching power supply circuit

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