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  • When there is a positive voltage bias outside, the mutual suppression and elimination of the external electric field and the self built electric field make the diffusion current of the carrier increase and cause a positive current. In the electronic circuit, if the positive terminal of the diode is connected to the high potential terminal and the negative terminal to the low potential terminal, the diode will turn on. This connection is called forward bias.
    2020-04-01
  • As shown in the figure, it is a unidirectional thyristor dimming lamp circuit suitable for lamp table. 220V AC is converted into 100Hz pulsating DC through vd1-vd4 bridge rectification, and then added to the anode and cathode of the thyristor VT through bulb E. At the same time, in each half cycle of the power supply, the capacitor C is charged through RP and R1. When the charging voltage at both ends of C reaches the conversion voltage (about 26-40v) of the bidirectional trigger diode VDH, the VDH is turned on, and the C discharges to R2. At both ends of R2, a sharp pulse is formed and added to the gate of VT, so that VT is turned on and E is turned on. When VT is turned on, the voltage drop between positive and negative electrodes is about 1V. When the alternating current is over zero, VT
    2020-03-30
  • ESD protection of portable equipment is very important, and TVS diode is a very effective protection device, which has its unique advantages compared with other devices. However, devices should be selected according to different protection objects in application, because different ports may be subject to different electrostatic shocks, and different devices require different degrees of protection. Attention should be paid to the corresponding parameter identification and different design of each manufacturer, and reasonable PCB layout should be carried out at the same time. This paper introduces how to use TVS diode in ESD protection of portable equipment.
    2020-03-24
  • When the applied voltage increases to more than the insulation strength of the gas, the gap between the two poles will be penetrated by the discharge shock, and the original insulation state will be transformed into the conductive state. After the conduction, the voltage between the two poles of the discharge tube will be maintained at the residual voltage level determined by the discharge arc.
    2020-03-23
  • According to foreign media reports, venture capital firms in recent weeks has been in the forefront of moral criticism. Kleiner Perkins Caufield & Byers, the company won the Ellen Pao sex discrimination case in, but the testimony in the trial is made of a woman is not particularly popular with top vc impression. Also often exist in the society women entrepreneurial success must sell hue malicious remarks
    2015-05-23