Talking about the Selection and Use Conditions of Zener Diode
The Zener diode is a special diode that operates in a reverse breakdown state, making the voltage across the tube essentially constant. When selecting a Zener diode, it should be considered according to the specific electronic circuit. In a simple parallel regulated power supply, the output voltage is the stable voltage of the Zener diode. The regulated power supply of the transistor radio can be selected with a 2CW54 type voltage regulator tube, and its stable voltage can reach 6.5V.
The voltage regulation value of the voltage regulator tube is highly discrete. Even if the same model product of the same manufacturer has a stable voltage value, it should be paid attention to when selecting. The voltage regulation value should be tested before selecting the circuit with higher requirements.
When using the Zener diode, it should be noted that the reverse current of the diode cannot be increased indefinitely, otherwise it will cause overheating damage to the diode. Therefore, the Zener diode generally requires a series current limiting resistor in the circuit. When selecting the Zener tube, if a tube with a large voltage regulation value is needed, there is no maintenance site. Several tubes with low voltage regulation value can be used in series; when a tube with a low voltage regulation value is needed, it can not be bought. Replace the Zener with a normal silicon diode forward conduction. For example, two 2CZ82A silicon diodes are connected in series and can be used as a 1.4V voltage regulator tube; however, the voltage regulator tubes are generally not used in parallel.
At present, the domestic voltage regulator tube has three electrodes, such as a 2DW7 type voltage regulator tube. The Zener diode encapsulates the two Zener diodes symmetrically with each other, so that the temperature coefficients of the two Zener tubes cancel each other out, which improves the stability of the tube. The three-electrode Zener is shaped like a crystal transistor and should be distinguished when it is selected.
In the voltage regulator circuit of the recorder and color TV, the 1N4370 and 1N746-1N986 series Zener diodes can be selected. For example, the 1N966 tube (2CW8) has a stable voltage of 16V, a dynamic resistance of 17Ω, and a voltage temperature coefficient of 0.09. The 1N975 type (2CW71) has a stable voltage of 39V, a dynamic resistance of 80Ω, and a reverse test current of 3.0mA. The current is 5μA and the power consumption is 500mw.
Silicon regulator diodes, such as the 2CW100-2CW121 series regulators, can be used in the voltage regulator circuits of electrical equipment and other radio electronics.
There are two conditions for a Zener diode to operate:
1. The voltage applied to the Zener diode in reverse is greater than the voltage regulator of the Zener diode.
2. The current through the Zener diode must reach its working condition (that is, the reverse current should be large enough, usually at least a few mA).
You follow the circuit I said, assuming a 6.2V regulator,
Positive power supply (9V) - resistance (R) - steady voltage of the voltage regulator - positive pole of the voltage regulator - negative pole of the power supply.
This resistor is calculated according to the parameters of the Zener diode. Assume that the current is 5 mA when the voltage is regulated.
Then the size of the resistor = (9-6.2) / 5mA = 1.4K or so, you can use a 1K resistor. Then you use a multimeter to measure the voltage between the negative pole of the Zener tube and the ground, basically around 6.2V, that is, the voltage is regulated.
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型号- 1SMB5919B,1SMB5929B,1SMB5939B,1SMB5927B,1SMB5949B,1SMB5937B,1SMB5925B,1SMB5947B,1SMB5935B,1SMB5923B,1SMB5945B,1SMB5933B,1SMB5955B,1SMB5943B,1SMB5931B,1SMB5953B,1SMB5941B,1SMB5951B,1SMB5920B,1SMB5922B,1SMB5914B,1SMB5916B,1SMB5918B,1SMB5928B,1SMB5938B,1SMB5926B,1SMB5948B,1SMB5936B,1SMB5924B,1SMB5946B,1SMB5956B,1SMB5934B,1SMB5944B,1SMB5932B,1SMB5954B,1SMB5942B,1SMB5930B,1SMB5952B,1SMB5940B,1SMB5950B,1SMB5921B,1SMB5913B,1SMB5915B,1SMB5917B
1N5333~1N5388 DO-15 ZENER DIODES ZENER VOLTAGE RANGE: 3.3--- 200V PEAK PULSE POWER: 5000mW
型号- 1N5360,1N5362,1N5361,1N5364,1N5363,1N5366,1N5365,1N5368,1N5367,1N5369,1N5371,1N5370,1N5373,1N5372,1N5375,1N5374,1N5333,1N5377,1N5376,1N5335,1N5379,1N5334,1N5378,1N5337,1N5336,1N5339,1N5338,1N5333B SERIES,1N5333B,1N5380,1N5382,1N5381,1N5340,1N5384,1N5383,1N5342,1N5386,1N5341,1N5385,1N5388,1N5344,1N5343,1N5387,1N5346,1N5345,1N5348,1N5347,1N5349,1N5351,1N5350,1N5353,1N5352,1N5355,1N5354,1N5357,1N5356,1N5359,1N5358
HZ2XX SERIES ZENER DIODE
型号- HZ4C1,HZ22-3,HZ3A1,HZ4C2,HZ3A2,HZ4C3,HZ3A3,HZ7A1,HZ7A2,HZ7A3,HZ22-1,HZ22-2,HZ4B2,HZ15-1,HZ4B3,HZ15-2,HZ15-3,HZ2XX,HZ3C1,HZ2A1,HZ3C2,HZ2A2,HZ3C3,HZ2A3,HZ7C1,HZ27-1,HZ6A1,HZ7C2,HZ27-2,HZ6A2,HZ7C3,HZ27-3,HZ6A3,HZ431,HZ11C1,HZ11C2,HZ11C3,HZ3B1,HZ3B2,HZ3B3,HZ16-1,HZ7B1,HZ16-2,HZ7B2,HZ16-3,HZ7B3,HZ11B1,HZ11B2,HZ11B3,HZ2C1,HZ2C2,HZ2C3,HZ24-1,HZ24-2,HZ6C1,HZ24-3,HZ6C2,HZ5A2,HZ6C3,HZ5A3,HZ9A1,HZ9A2,HZ9A3,HZ20-1,HZ20-2,HZ20-3,HZ12C1,HZ11A1,HZ12C2,HZ11A2,HZ12C3,HZ11A3,HZ2B1,HZ2B2,HZ2B3,HZ6B1,HZ6B2,HZ6B3,HZ2XX SERIES,HZ12B1,HZ12B2,HZ12B3,HZ5C1,HZ4A1,HZ5C2,HZ4A2,HZ5C3,HZ4A3,HZ9C1,HZ9C2,HZ9C3,HZ12A1,HZ12A2,HZ12A3,HZ5B1,HZ5B2,HZ5B3,HZ18-1,HZ9B1,HZ18-2,HZ9B2,HZ18-3,HZ9B3
浅谈稳压二极管的选用和使用条件
稳压二极管是工作在反向击穿状态下的，使管子两端电压基本不变的一种特殊二极管。选用稳压管时，要根据具体电子电路来考虑，简单的并联稳压电源，输出电压就是稳压管的稳定电压。晶体管收音机的稳压电源可选用2CW54型的稳压管，其稳定电压达6.5V即可。
Silicon Rectifier Diode Characteristics and Working Principle
Rectifier diodes are mainly used for various low-frequency half-wave rectifier circuits. If full-wave rectification is required, they must be used as rectifier bridges. This article mainly introduces the characteristics and working principle of silicon rectifier diodes.The rectifying diode uses the unidirectional conductive characteristic of the PN junction to convert the alternating current into pulsed direct current. Rectifier diodes have large leakage currents, and most are diode-packaged diodes.
ZMM5221~ZMM5263 LL34 SURFACE MOUNT ZENER DIODES ZENER VOLTAGE RANGE: 2.4---56V PEAK PULSE POWER: 500mV
型号- ZMM5260B,ZMM5250B,ZMM5228B,ZMM5226B,ZMM5248B,ZMM5238B,ZMM5224B,ZMM5246B,ZMM5236B,ZMM5258B,ZMM5222B,ZMM5244B,ZMM5234B,ZMM5256B,ZMM5242B,ZMM5232B,ZMM5254B,ZMM5240B,ZMM5262B,ZMM5230B,ZMM5252B,ZMM5261B,ZMM5239B,ZMM5229B,ZMM5237B,ZMM5259B,ZMM5227B,ZMM5249B,ZMM5235B,ZMM5257B,ZMM5225B,ZMM5247B,ZMM5233B,ZMM5255B,ZMM5223B,ZMM5245B,ZMM5231B,ZMM5253B,ZMM5221,ZMM5221B,ZMM5243B,ZMM5251B,ZMM5263,ZMM5241B,ZMM5263B
ZMM55C2V0~ZMM55C39V LL34 SURFACE MOUNT ZENER DIODES ZENER VOLTAGE RANGE: 2.0---39V PEAK PULSE POWER: 500mW
型号- ZMM55C3V0,ZMM55C2V2,ZMM55C18,ZMM55C2V4,ZMM55C3V3,ZMM55C5V1,ZMM55C2V0,ZMM55C4V7,ZMM55C5V6,ZMM55C3V9,ZMM55C7V5,ZMM55C6V8,ZMM55C4V3,ZMM55C6V2,ZMM55C2V7,ZMM55C3V6,ZMM55C8V2,ZMM55C9V1,ZMM55C30,ZMM55C12,ZMM55C13,ZMM55C10,ZMM55C11,ZMM55C33,ZMM55C16,ZMM55C39,ZMM55C14,ZMM55C36,ZMM55C15,ZMM55C39V,ZMM55C20,ZMM55C24,ZMM55C22,ZMM55C27
Schottky Diode Action
Due to schottky dioderobust structure, fast response and low clutter, Schottky diodes are widely used in high frequency circuits. In recent years, it has also been used in low-voltage, high-current power circuits and AC-DC converter systems.
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