Good day,I would like to make a linear battery charger which is 24V-36V according to the following schematic diagram.:thanks:
In this circuit,
Q1 & Q2 make up a power Darlington using the venerable 2N3055 power transistor. The base of the Darlington is controlled by Q4, the voltage regulator transistor—it compares the feedback voltage coming from the voltage scaling pot with the 6.2V zener reference connected in the emitter circuit. C3 is a compensation capacitor that slows down the regulator in order to prevent potential oscillation.
Instead of using a pull-up resistor to turn the Darlington on, Q3 is configured as a 1mA current source. Working into a current source, Q4 dissipates less power, increases maximum voltage applied to the Darlington and increases voltage regulator gain. High voltage (80V) transistors are required for this application and the MPSA06 is suggested.
The MPSA06 datasheet
R5 and Q5 make up the current regulator. When the voltage across R5 exceeds about 0.65V, Q5 turns on and shunts base drive from the power Darlington thus causing the output voltage to be reduced. My battery charger circuit ran at 1.1A.
There are two modes of operation—voltage regulation or current regulation—the current regulator (when in operation) takes precedence over the voltage regulator.
Before I make it,I would like to ask some questions:
1. The transformer is used to wear how ampere? if I can use a 3A or 5A transformer with a secondary volt 12V, 15V, 18V, 25V, and 32V?
2. whether I can use the transformer CT 25V or 32V to 39VDC voltage gain? if it could please be given a picture?
3. In the series there is no LED lights that can indicate that charging has been filled?
Thank you for your time and chances.
Greetings
In this circuit,
Q1 & Q2 make up a power Darlington using the venerable 2N3055 power transistor. The base of the Darlington is controlled by Q4, the voltage regulator transistor—it compares the feedback voltage coming from the voltage scaling pot with the 6.2V zener reference connected in the emitter circuit. C3 is a compensation capacitor that slows down the regulator in order to prevent potential oscillation.
Instead of using a pull-up resistor to turn the Darlington on, Q3 is configured as a 1mA current source. Working into a current source, Q4 dissipates less power, increases maximum voltage applied to the Darlington and increases voltage regulator gain. High voltage (80V) transistors are required for this application and the MPSA06 is suggested.
The MPSA06 datasheet
R5 and Q5 make up the current regulator. When the voltage across R5 exceeds about 0.65V, Q5 turns on and shunts base drive from the power Darlington thus causing the output voltage to be reduced. My battery charger circuit ran at 1.1A.
There are two modes of operation—voltage regulation or current regulation—the current regulator (when in operation) takes precedence over the voltage regulator.
Before I make it,I would like to ask some questions:
1. The transformer is used to wear how ampere? if I can use a 3A or 5A transformer with a secondary volt 12V, 15V, 18V, 25V, and 32V?
2. whether I can use the transformer CT 25V or 32V to 39VDC voltage gain? if it could please be given a picture?
3. In the series there is no LED lights that can indicate that charging has been filled?
Thank you for your time and chances.
Greetings
A Linear Battery Charger
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