Model and parameters of rectifier diodes

Rectifier diodes are semiconductor devices composed of PN structures. PN junction is a structure composed of P-type semiconductor and N-type semiconductor materials, where P-type semiconductor is positively charged and N-type semiconductor is negatively charged. This article will provide a detailed introduction to the models and parameters of rectifier diodes.

1、 Rectifier diode model

The model of the rectifier diode is generally specific to the manufacturer, and different models can be selected according to different business needs. The following are several common rectifier diode models:

1. 1N4001~1N4007: A universal rectifier diode suitable for low-voltage and low-frequency applications.

2. 1N5400~1N5408: High voltage rectifier diode suitable for high-voltage and high-frequency applications.

3. FR107: This is a fast recovery rectifier diode suitable for high-frequency applications.

4. UF4007: Ultra fast recovery rectifier diode suitable for high-frequency applications.

Rectification of diode parameter values

The parameter values of rectifier diodes include large reverse voltage, large forward current, forward voltage drop, etc. These parameters determine the performance and application range of rectifier diodes.

1. High reverse voltage (VRRM): This is the main reverse voltage that the rectifier diode can withstand, and exceeding this voltage can cause the diode to penetrate and damage.

2. High forward current (IF): This is the main positive current that the rectifier diode can withstand, and exceeding this current can cause the diode to overheat and damage.

3. Forward voltage drop (VF): This is the voltage drop when the rectifier diode is turned on, also known as positive voltage drop. The lower the positive voltage drop, the better the on-off ability of the rectifier diode.

4. Reverse Leakage Current (IR): This is the leakage current of the rectifier diode under reverse voltage, which is generally small but can increase at high temperatures.

5. Reverse recovery time (trr): This is the time required for the rectifier diode to boot from reverse to forward, also known as reverse recovery time. The less the reverse recovery time, the better the reverse characteristics of the rectifier diode.

3、 How to Select Rectifier Diodes

When selecting rectifier diodes, appropriate models and parameters must be determined based on actual business needs. The opinions on selecting rectifier diodes are as follows:

1. Determine the larger reverse voltage: Based on the working voltage of the power supply, select a rectifier diode that can withstand the corresponding voltage.

2. Determine the larger positive current: Based on the load current of the power supply, select a rectifier diode that can withstand the corresponding current.

3. Consider reverse leakage current: If the circuit needs to operate for a long time at high temperatures, a rectifier diode with a smaller reverse leakage current should be selected.

4. Consider reverse recovery time: If the circuit must operate at high frequencies, a rectifier diode with a short reverse recovery time should be selected.

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