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Reverse Recovery Charge Formula

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Reverse Recovery Charge is the charge required to get anode current zero or, recovering its ability to block negative voltage from developing a current in BJT. Check FAQs

Q RR = 0.5 \cdot I RR \cdot t rr

Q_RR - Reverse Recovery Charge?I_RR - Reverse Recovery Current?t_rr - Reverse Recovery Time?

Reverse Recovery Charge Example

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With units

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Here is how the Reverse Recovery Charge equation looks like with Values.

Here is how the Reverse Recovery Charge equation looks like with Units.

Here is how the Reverse Recovery Charge equation looks like.

0.0401 = 0.5 \cdot 35 \cdot 2.29

0.0401C = 0.5 \cdot 35mA \cdot 2.29s

0.0401 = 0.5 \cdot 35 \cdot 2.29

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Reverse Recovery Charge Solution

Follow our step by step solution on how to calculate Reverse Recovery Charge?

FIRST Step Consider the formula

Q RR = 0.5 \cdot I RR \cdot t rr

Next Step Substitute values of Variables

∴

Q RR = 0.5 \cdot 35mA \cdot 2.29s

Next Step Convert Units

∴

Q RR = 0.5 \cdot 0.035A \cdot 2.29s

Next Step Prepare to Evaluate

∴

Q RR = 0.5 \cdot 0.035 \cdot 2.29

Next Step Evaluate

∴

Q RR = 0.040075C

LAST Step Rounding Answer

∴

Q RR = 0.0401C

Reverse Recovery Charge Formula Elements

Variables

Reverse Recovery Charge

Reverse Recovery Charge is the charge required to get anode current zero or, recovering its ability to block negative voltage from developing a current in BJT.

Symbol: Q_RR

Measurement: Electric ChargeUnit: C

Note: Value should be greater than 0.

Formulas to find Reverse Recovery Charge

Reverse Recovery Current

Reverse Recovery Current is required by a power diode when it is quickly reverse biased and this current is required to clear it of charge carriers so that it can block the reverse voltage in BJT.

Symbol: I_RR

Measurement: Electric CurrentUnit: mA

Note: Value can be positive or negative.

Formulas to find Reverse Recovery Current

Reverse Recovery Time

Reverse Recovery Time is the amount of time the current flows in the reverse direction when the forward current simultaneously switches directions due to residual stored charge in BJT.

Symbol: t_rr

Measurement: TimeUnit: s

Note: Value should be greater than 0.

Formulas to find Reverse Recovery Time

Other formulas in BJT category

Go Reverse Recovery Time

t rr = \sqrt{2 \cdot \frac{Q RR}{ΔI}}

Go Reverse Recovery Current

I RR = \sqrt{2 \cdot Q RR \cdot ΔI}

Go Softness Factor

s = \frac{t b}{t a}

Go BJT Turn ON Time

T on = T r + T d

How to Evaluate Reverse Recovery Charge?

Reverse Recovery Charge evaluator uses Reverse Recovery Charge = 0.5*Reverse Recovery Current*Reverse Recovery Time to evaluate the Reverse Recovery Charge, The Reverse Recovery Charge is the charge required to remove the excess carriers from the drift region to increase the width of the depletion junction. Reverse Recovery Charge is denoted by Q_RR symbol.

How to evaluate Reverse Recovery Charge using this online evaluator? To use this online evaluator for Reverse Recovery Charge, enter Reverse Recovery Current (I_RR) & Reverse Recovery Time (t_rr) and hit the calculate button.

FAQs on Reverse Recovery Charge

What is the formula to find Reverse Recovery Charge?

The formula of Reverse Recovery Charge is expressed as Reverse Recovery Charge = 0.5*Reverse Recovery Current*Reverse Recovery Time. Here is an example- 0.040075 = 0.5*0.035*2.29.

How to calculate Reverse Recovery Charge?

With Reverse Recovery Current (I_RR) & Reverse Recovery Time (t_rr) we can find Reverse Recovery Charge using the formula - Reverse Recovery Charge = 0.5*Reverse Recovery Current*Reverse Recovery Time.

Can the Reverse Recovery Charge be negative?

No, the Reverse Recovery Charge, measured in Electric Charge cannot be negative.

Which unit is used to measure Reverse Recovery Charge?

Reverse Recovery Charge is usually measured using the Coulomb[C] for Electric Charge. Kilocoulomb[C], Millicoulomb[C], Picocoulomb[C] are the few other units in which Reverse Recovery Charge can be measured.

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