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- Voltage-regulator_tube abstract "A voltage-regulator tube (VR tube) is an electronic component used as a shunt regulator to hold a voltage constant at a pre-determined level.Physically, these devices resemble vacuum tubes, but there are two main differences: Their glass envelopes are filled with a gas mixture, and They have a cold cathode; the cathode is not heated with a filament to emit electrons.Electrically, these devices resemble Zener diodes, with the following major differences: They rely on gas ionization, rather than Zener breakdown The unregulated supply voltage must be 15–20% above the nominal output voltage to ensure that the discharge starts The output can be higher than nominal if the current through the tube is too low.When sufficient voltage is applied across the electrodes, the gas ionizes, forming a glow discharge around the cathode electrode. The VR tube then acts as a negative resistance device; as the current through the device increases, the amount of ionization also increases, reducing the resistance of the device to further current flow. In this way, the device conducts sufficient current to hold the voltage across its terminals to the desired value.Because the device would conduct a nearly unlimited amount of current, there must be some external means of limiting the current. Usually, this is provided by an external resistor upstream from the VR tube. The VR tube then conducts any portion of the current that does not flow into the downstream load, maintaining an approximately constant voltage across the VR tube's electrodes. The VR tube's regulation voltage was only guaranteed when conducting an amount of current within the allowable range. In particular, if the current through the tube is too low to maintain ionization, the output voltage can rise above the nominal output—as far as the input supply voltage. If the current through the tube is too high, it can enter an arc discharge mode where the voltage will be significantly lower than nominal and the tube may be damaged.Some voltage-regulator tubes contained small amounts of radionuclides to produce a more reliable ionization.The Corona VR tube is a high-voltage version that's hydrogen-filled at close to atmospheric pressure, for voltages ranging from 400 V to 30 kV at tens of microamperes. It has a coaxial form; the outer cylindrical electrode is the cathode and the inner one is the anode. The voltage stability depends on the gas pressure.".
- Voltage-regulator_tube thumbnail Ccvrt.svg?width=300.
- Voltage-regulator_tube wikiPageID "1537097".
- Voltage-regulator_tube wikiPageRevisionID "588255436".
- Voltage-regulator_tube hasPhotoCollection Voltage-regulator_tube.
- Voltage-regulator_tube subject Category:Electrical_breakdown.
- Voltage-regulator_tube subject Category:Vacuum_tubes.
- Voltage-regulator_tube type Artifact100021939.
- Voltage-regulator_tube type Device103183080.
- Voltage-regulator_tube type ElectronicDevice103277771.
- Voltage-regulator_tube type Instrumentality103575240.
- Voltage-regulator_tube type Object100002684.
- Voltage-regulator_tube type PhysicalEntity100001930.
- Voltage-regulator_tube type Tube104494204.
- Voltage-regulator_tube type VacuumTubes.
- Voltage-regulator_tube type Whole100003553.
- Voltage-regulator_tube comment "A voltage-regulator tube (VR tube) is an electronic component used as a shunt regulator to hold a voltage constant at a pre-determined level.Physically, these devices resemble vacuum tubes, but there are two main differences: Their glass envelopes are filled with a gas mixture, and They have a cold cathode; the cathode is not heated with a filament to emit electrons.Electrically, these devices resemble Zener diodes, with the following major differences: They rely on gas ionization, rather than Zener breakdown The unregulated supply voltage must be 15–20% above the nominal output voltage to ensure that the discharge starts The output can be higher than nominal if the current through the tube is too low.When sufficient voltage is applied across the electrodes, the gas ionizes, forming a glow discharge around the cathode electrode. ".
- Voltage-regulator_tube label "Glimmstabilisator".
- Voltage-regulator_tube label "Jarzeniówka stabilizacyjna".
- Voltage-regulator_tube label "Voltage-regulator tube".
- Voltage-regulator_tube label "Стабилитрон тлеющего разряда".
- Voltage-regulator_tube sameAs Glimmstabilisator.
- Voltage-regulator_tube sameAs Jarzeniówka_stabilizacyjna.
- Voltage-regulator_tube sameAs m.058vc7.
- Voltage-regulator_tube sameAs Q1318793.
- Voltage-regulator_tube sameAs Q1318793.
- Voltage-regulator_tube sameAs Voltage-regulator_tube.
- Voltage-regulator_tube wasDerivedFrom Voltage-regulator_tube?oldid=588255436.
- Voltage-regulator_tube depiction Ccvrt.svg.
- Voltage-regulator_tube isPrimaryTopicOf Voltage-regulator_tube.