Skip to main content

Diode recovery time


Understanding the parameters of "diode recovery time" .For prospective technicians are still learning and inexperienced, they generally recognize only two kinds of parameters of a diode, namely:

  • The maximum working voltage (bias voltage when he gets back - or when not deliver - or when "off")
  • The maximum operating current (when he gets a forward bias voltage of - or as leads - or when "on")
Understanding the parameters of "diode recovery time"
Fast Recovery diodes
A similar experience we had some twenty years ago when a new SMPS first introduced on the television. When there is a diode voltage B + is broken. And then we replace the diode from the outside (our point of diode being sold in stores, rather than the official service) diode turns hot and soon broken. We think that the replacement diode voltage or current is less bulky. Then after replacement with a larger, but the result remains the same damage. Finally we order the diode with the same part number, and when the part arrived and was installed wrong results immediately.

Then why the diode is purchased in the market is hot and faulty? Actually there are many other parameters that have a diode. One more thing to be understood by a technician is called a "diode recovery time".
Common diode rectifier is used for the power supply circuits of 50Hz, when he gets forward biased diode voltage will deliver ("on"). Then, if the bias voltage is turned upside down then the diode does not turn into leads ("off"). If the diode is then mounted on a high-frequency ac voltage. So when given the diode forward bias voltage will deliver ("on") as usual. But when the bias voltage is turned upside down, apparently indirect diode can turn into "off" quickly. 

There is a delay of a minute to "off" so that when the bias voltage is turned "off" there is still a bit of reverse leakage current. If the frequency of the ac leakage current was further compounded the greater the return. Reverse leakage current is what causes the diode to be hot.
Diode recovery time is a parameter of a diode which shows the "time" needed for the change of position "on" to "off" position. The smaller the value the better the recovery time is used at high frequencies.


Based on the parameters of the diode recovery time, then this type of diode is classified into:
  • Diode general, for the rectifier AC voltage
  • Fast Recovery Diode, used in the circuit and the flyback SMPS with a frequency of approximately 35 Khz
  • Super Fast recovery diode, used in SMPS circuits with a frequency of about 70 to 80 Khz.
  • Tips to find the diode equation.
  • If we can not get the diode with the same part number, then we will usually replace it with another part number. We will replace the diode with the diode used in the same location. For example, diode B +-A model of the television is broken, then we will replace the B + diode that is used by television B or C.



Labels:

Comments

Post a Comment

Popular posts from this blog

OP AMP INTEGRATOR CALCULATOR

Enter the Input Voltage,Vin: Volts Enter the Frequency, f: Hertz Enter the Input Resistance, Rin: Ohms Enter the Value of Capacitor, C: Farads Output Voltage, Vout: Volts OP AMP based Integrator Tutorial and Design
Post a Comment
Read more

Using the TLP250 Isolated MOSFET Driver Explanation and Example Circuits

I’ve already shown how to drive an N-channel MOSFET (or even an IGBT) in both high-side and low-side configurations in a multitude of ways. I’ve also explained the principles of driving the MOSFETs in these configurations. The dedicated drivers I’ve shown so far are the TC427 and IR2110. Some people have requested me to write up on MOSFET drive using the very popular TLP250. And I’ll explain that here. The TLP250, like any driver, has an input stage, an output stage and a power supply connection. What’s special about the TLP250 is that the TLP250 is an optically isolated driver, meaning that the input and output are “optically isolated”. The isolation is optical – the input stage is an LED and the receiving output stage is light sensitive (think “photodetector”). Before delving any further, let’s look at the pin configuration and the truth table. Fig. 1 - TLP250 Pin Configuration Fig. 2 - TLP250 Truth Table Fig. 1 clearly shows the input LED side and the receiving photodetector as well...
Post a Comment
Read more

Block diagram of AM transmitter and receiver with explanation

Block diagram of AM transmitter and receiver with explanation AM Transmitter : Transmitters that transmit AM signals are known as AM transmitters. These transmitters are used in medium wave (MW) and short wave (SW) frequency bands for AM broadcast. The MW band has frequencies between 550 KHz and 1650 KHz, and the SW band has frequencies ranging from 3 MHz to 30 MHz. The two types of AM transmitters that are used based on their transmitting powers are: ·          High Level ·          Low Level High level transmitters use high level modulation, and low level transmitters use low level modulation. The choice between the two modulation schemes depends on the transmitting power of the AM transmitter. In broadcast transmitters, where the transmitting power may be of the order of kilowatts, high level modulation is employed. In low power transmitters, where only a few watts of transmitting power are required , low...
Post a Comment
Read more