How to Reference current?

Overvoltage protection circuit used in power factor corrector and power factor corrector,LDO circuit,C/V integrated capacitive humidity sensor interface circuit,Method and system for open loop compensation of delay variations in a delay line

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4 results about "Reference current" patented technology

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A reference current is just a stable source of current that does not fluctuate over temperature, supply voltages or loads. This "reference" is known to be at a specific value and very stable. This way it can be used to compare other currents to (as a reference).

Overvoltage protection circuit used in power factor corrector and power factor corrector

InactiveCN101557162AImprove transient responseEffective protectionEfficient power electronics conversionEmergency protective circuit arrangementsOvervoltageReference current

The invention provides an overvoltage protection circuit used in a power factor corrector and the power factor corrector, wherein the overvoltage protection circuit comprises a current-voltage switching circuit, a reference current-reference voltage switching circuit, a static overvoltage comparing circuit, a dynamic overvoltage comparing circuit and an overvoltage synthesizing circuit; the current-voltage switching circuit is used for switching a current signal output by an error computing amplifier to a first voltage signal and outputting the first voltage signal to the static overvoltage comparing circuit and the dynamic overvoltage comparing circuit; the reference current-reference voltage switching circuit is used for switching the reference current signal of a current source to a second voltage signal and outputting the second voltage signal to the dynamic overvoltage comparing circuit; the static overvoltage comparing circuit is used for comparing the voltage value of the first voltage signal with the voltage value of the reference voltage of the static overvoltage comparing circuit and outputting a static overvoltage signal; the dynamic overvoltage comparing circuit is used for comparing the voltage value of the first voltage signal and the voltage value of the second voltage signal and outputting a dynamic overvoltage signal; the overvoltage synthesizing circuit is used for synthesizing the static overvoltage signal and the dynamic overvoltage signal, controlling the shut-off of a power element and realizing quick shut-off of the power element.

Owner:XIAN MINZHAN COMM TECH CO LTD

LDO circuit

InactiveCN108021169AReduce power consumptionSmall fluctuationElectric variable regulationReference currentHemt circuits

The invention provides an LDO circuit. The LDO circuit comprises a reference source, a differential amplifier and an LDO output stage. The reference source provides one reference voltage and one reference current bias voltage; a first input end of the differential amplifier is connected to the reference voltage output by the reference source, a second input end of the differential amplifier is connected to the output voltage of the LDO, and the output end of the differential amplifier is connected to a grid of a power output tube of the LDO. The differential amplifier and the LDO output stageform a closed loop to make the output voltage stabilized at the reference voltage. The LDO output stage comprises a tail current source NM6 which can reduce fluctuation of the output voltage. The LDOcircuit is simple in structure, has low technological requirements and reduces the complexity of chip design.

Owner:SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI

C/V integrated capacitive humidity sensor interface circuit

InactiveCN107525828AHigh sensitivityFast dynamic responseMaterial capacitanceCapacitanceReference current

A C/V integrated capacitive humidity sensor interface circuit is suitable for the field of Internet of Things. Humidity sensor interface circuit is composed of folded cascode operational amplifier, reference current source, bias circuit and compensation circuit. The first stage adopts a folded cascode structure, which provides higher gain; the second stage adopts a common source structure, which provides a higher output swing. The bias circuit adopts a self-starting bootstrap reference current source, thereby reducing the influence of the power supply voltage on the charging and discharging of the capacitor. The circuit has high sensitivity, fast dynamic response, good stability, simple structure, easy digitization, and good anti-interference and reliability.

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Owner:李征

Method and system for open loop compensation of delay variations in a delay line

InactiveUS20110204958A1Low powerPulse automatic controlElectronic switchingReference currentEngineering

The present invention provides a method and system for open loop compensation of delay variations in a delay line. The method includes sensing the Process, Voltage, Temperature (PVT) variations in the delay line using a sensing circuit. A first and second sensitive current are generated based on the PVT variations. The first and second sensitive currents are mirrored currents from the sensing circuit. Then, a first compensation current is generated based on the first sensitive current and a first summing current. The first summing current is a reference current independent of the PVT variations. Further, the first compensation current is mirrored as a second summing current and a second compensation current is generated from the second sensitive current and the second summing current. The second compensation current compensates the delay variations and has a sensitivity based on the sensitivities of the first and second sensitive currents.