0-30V 0-5A Adjustable Power Supply Constant Voltage And Current Board Diy Kits
Adjustable power supply motherboard DIY kit for accessories with spare transformers in hand
The old power supply can be modified to use its chassis, transformers, meters and other accessories
Linear adjustable design idea, imperfect output protection circuit, only for amateur study
An English circuit schematic diagram and bill of materials are included with the package
Great for personal DIY
The old power supply can be modified to use its chassis, transformers, meters and other accessories
Linear adjustable design idea, imperfect output protection circuit, only for amateur study
An English circuit schematic diagram and bill of materials are included with the package
Great for personal DIY
Product information:
1. Please install 1A fuse for AC 220V incoming line
1. Please install 1A fuse for AC 220V incoming line
2. Please also weld carefully, the polarity of components must not be reversed, especially for large electrolysis!
For the first time, try to stay away from the motherboard as far as possible! Prevent the electric cannon incident caused by various welding errors! ! !
The voltage and current potentiometers must be welded and contacted firmly! ! !
If the potentiometer is disconnected during use, there will be 30V voltage and 5A current output! ! !
The circuit component parameters are designed for 30V5A, please do not change the output voltage and current arbitrarily! ! !
For the first time, try to stay away from the motherboard as far as possible! Prevent the electric cannon incident caused by various welding errors! ! !
The voltage and current potentiometers must be welded and contacted firmly! ! !
If the potentiometer is disconnected during use, there will be 30V voltage and 5A current output! ! !
The circuit component parameters are designed for 30V5A, please do not change the output voltage and current arbitrarily! ! !
3. The kit does not include the following:
(1) 150W-180W transformer (current 5A)
Can be customized to specify the required 3 voltage output values 15V 23V 31V ( 5A)
Add a double 12V to double 15V current 1A winding on a transformer,
The most suitable one is to disassemble the machine with a broken power supply.
Or dual 12V to dual 15V with a current of 5A for the disassembly of the power amplifier. Add a 15W small transformer.
(2) Voltage and current meter head
(3) 2 heat sinks for TIP3055,
(4) 12V0.2A cooling fan
(5) Chassis and red and black binding posts
(1) 150W-180W transformer (current 5A)
Can be customized to specify the required 3 voltage output values 15V 23V 31V ( 5A)
Add a double 12V to double 15V current 1A winding on a transformer,
The most suitable one is to disassemble the machine with a broken power supply.
Or dual 12V to dual 15V with a current of 5A for the disassembly of the power amplifier. Add a 15W small transformer.
(2) Voltage and current meter head
(3) 2 heat sinks for TIP3055,
(4) 12V0.2A cooling fan
(5) Chassis and red and black binding posts
Simple circuit description:
L1 is the auxiliary control power supply. It uses a center-tapped dual 12V to dual 15 voltage and current 1A transformers. The L1 winding is preferably wound on a transformer with the main power supply. The transformer at hand does not have such a winding, and a small independent transformer can also be used, but it needs to be controlled by the same switch as the L2 main transformer. L2 is the main voltage output, which requires more power. If 150W--180W outputs 30V, the suitable tap voltage is 0V-15V-23V-31V. The current is 5A (note that the voltage after rectification should be within 50V! The best is within 40V) The main voltage transformer can also choose a 150W commonly used center tap. Double 13V, double 14, double 15, the current is 5A. The 3 wires of such a 5A double output are connected to the first 3 wiring sockets in turn, and the fourth wiring socket is empty. At this time, the relay RL2 is not installed, and the normally closed 2 pins of RL2 are also short-circuited. The auxiliary control supporting electrolysis uses 25V2200*2 or 3300*2, the 7.5K in the main voltage bleeder resistance circuit diagram is replaced by 2K 3W*2, and the main voltage filtering uses 50V2200UF*3 (the total capacity should not be greater than 6600uF) to adjust the voltage and current of the two external The potentiometer can be replaced by a stable and reliable multi-turn adjustable!
L1 is the auxiliary control power supply. It uses a center-tapped dual 12V to dual 15 voltage and current 1A transformers. The L1 winding is preferably wound on a transformer with the main power supply. The transformer at hand does not have such a winding, and a small independent transformer can also be used, but it needs to be controlled by the same switch as the L2 main transformer. L2 is the main voltage output, which requires more power. If 150W--180W outputs 30V, the suitable tap voltage is 0V-15V-23V-31V. The current is 5A (note that the voltage after rectification should be within 50V! The best is within 40V) The main voltage transformer can also choose a 150W commonly used center tap. Double 13V, double 14, double 15, the current is 5A. The 3 wires of such a 5A double output are connected to the first 3 wiring sockets in turn, and the fourth wiring socket is empty. At this time, the relay RL2 is not installed, and the normally closed 2 pins of RL2 are also short-circuited. The auxiliary control supporting electrolysis uses 25V2200*2 or 3300*2, the 7.5K in the main voltage bleeder resistance circuit diagram is replaced by 2K 3W*2, and the main voltage filtering uses 50V2200UF*3 (the total capacity should not be greater than 6600uF) to adjust the voltage and current of the two external The potentiometer can be replaced by a stable and reliable multi-turn adjustable!
Change explanation: When the load is open circuit or light load, the voltage will have a relatively large overshoot when the original circuit is shut down.
1. To reduce the bleeder resistance of the main filter capacitor, 7.5K is reduced to 2K.
2. The purpose of increasing c1 and c2 to 2200uf or 3300uf is to control the power retention time of the circuit capacitor to be longer than the power retention time of the main filter capacitor, so as to prevent the control circuit (auxiliary circuit) from losing power and causing the output voltage of the main circuit to run out of control)
Responsibility statement:
Since this product is provided in a kit, the kit needs to be assembled by yourself, including electronic component soldering, circuit debugging, etc., which are complex actions that require experience.
This kit provides all components and circuit schematic diagrams, but users need to prepare transformers, casings, and voltage and ammeters by themselves! The user must understand that there may be failures due to unsuccessful assembly due to various unexpected reasons, and the user will be responsible for the losses.
Electronic products are closely related to electricity, please confirm whether to purchase or not according to your own electronic production capabilities.
This kit does not provide any technical support. Before purchasing, please refer to the schematic diagram of the kit and related debugging instructions carefully to confirm that you can complete the independent debugging before purchasing. Thank you for your cooperation!
Since this product is provided in a kit, the kit needs to be assembled by yourself, including electronic component soldering, circuit debugging, etc., which are complex actions that require experience.
This kit provides all components and circuit schematic diagrams, but users need to prepare transformers, casings, and voltage and ammeters by themselves! The user must understand that there may be failures due to unsuccessful assembly due to various unexpected reasons, and the user will be responsible for the losses.
Electronic products are closely related to electricity, please confirm whether to purchase or not according to your own electronic production capabilities.
This kit does not provide any technical support. Before purchasing, please refer to the schematic diagram of the kit and related debugging instructions carefully to confirm that you can complete the independent debugging before purchasing. Thank you for your cooperation!
About the principle, characteristics and use of adjustable constant voltage and constant current power
supply:
The principle of constant voltage and constant current:
According to U=IR, R=U/I:
If R>(U/I), the power supply works normally.
If R<(U/I), I is constant, the power supply constant current is partially protected, and the output voltage drops until the condition R=(U/I) is satisfied.
The principle of constant voltage and constant current:
According to U=IR, R=U/I:
If R>(U/I), the power supply works normally.
If R<(U/I), I is constant, the power supply constant current is partially protected, and the output voltage drops until the condition R=(U/I) is satisfied.
characteristic:
The so-called constant voltage, that is, the voltage can be constant to a value, and the adjustable constant voltage, that is, the constant voltage value is adjustable.
The so-called constant current, that is, the current can be constant to a value, and the adjustable constant current, that is, the constant current value is adjustable.
The so-called constant voltage, that is, the voltage can be constant to a value, and the adjustable constant voltage, that is, the constant voltage value is adjustable.
The so-called constant current, that is, the current can be constant to a value, and the adjustable constant current, that is, the constant current value is adjustable.
use:
Before using the adjustable constant voltage and constant current power supply, you need to set the constant current protection value, and then set the output voltage, and then start to work.
First, adjust the output voltage of the power supply to about 5V, short-circuit output, adjust the current output knob to set the protection current to the value you need, cancel the short-circuit, adjust the voltage to the required value, and connect the experimental equipment to start working.
Before using the adjustable constant voltage and constant current power supply, you need to set the constant current protection value, and then set the output voltage, and then start to work.
First, adjust the output voltage of the power supply to about 5V, short-circuit output, adjust the current output knob to set the protection current to the value you need, cancel the short-circuit, adjust the voltage to the required value, and connect the experimental equipment to start working.
For example: the working voltage of a circuit is 12V and the required current is about 0.3A, the operation is as follows.
Adjust the output voltage of the power supply to about 5V, short-circuit output, adjust the current output knob to set the protection current to 0.5A (slightly larger than the working current), cancel the short-circuit, adjust the voltage to 12V, and connect the circuit to start the experiment.
If the circuit board is placed on the metal part of the circuit during the test, the circuit is short-circuited, causing the current to increase sharply. When the current rises to 0.5A, the constant current protection part of the power supply works immediately and the output voltage drops to protect the test equipment.
Adjust the output voltage of the power supply to about 5V, short-circuit output, adjust the current output knob to set the protection current to 0.5A (slightly larger than the working current), cancel the short-circuit, adjust the voltage to 12V, and connect the circuit to start the experiment.
If the circuit board is placed on the metal part of the circuit during the test, the circuit is short-circuited, causing the current to increase sharply. When the current rises to 0.5A, the constant current protection part of the power supply works immediately and the output voltage drops to protect the test equipment.
Common sense to understand:
After the AC voltage is filtered by the full-wave rectifier capacitor, the DC voltage is about 1.414 times that of the AC voltage.
For example, after the AC voltage of 10V is filtered by the full-wave rectifier capacitor, the DC voltage is approximately equal to 14V. Selection of relay switching point:
The AC input voltage minus 5V equals the switching voltage.
For example transformer tap 0-15V-25V-35
Then the switching voltage of the first stage is 15V-5V=10V, that is, it switches to the 25V tap at 10V.
The switching voltage of the second stage is 25V-5V=20V, that is, it switches to the 35V tap at 20V.
Whether the relay is switched or not can be judged by measuring the voltage across R17. The R17 voltage (DC) divided by 1.414 is approximately equal to the current tap voltage (AC).
After the AC voltage is filtered by the full-wave rectifier capacitor, the DC voltage is about 1.414 times that of the AC voltage.
For example, after the AC voltage of 10V is filtered by the full-wave rectifier capacitor, the DC voltage is approximately equal to 14V. Selection of relay switching point:
The AC input voltage minus 5V equals the switching voltage.
For example transformer tap 0-15V-25V-35
Then the switching voltage of the first stage is 15V-5V=10V, that is, it switches to the 25V tap at 10V.
The switching voltage of the second stage is 25V-5V=20V, that is, it switches to the 35V tap at 20V.
Whether the relay is switched or not can be judged by measuring the voltage across R17. The R17 voltage (DC) divided by 1.414 is approximately equal to the current tap voltage (AC).
Preparation before debugging:
After the installation is checked and correct (the capacitor and diode at the output end must be installed; the TIP3055 should be installed on a large radiator), if you do not have an ammeter connected, please short-circuit the ammeter contact "A", and then turn on the power.
Please refer to the schematic diagram:
Measure the voltage of C1 and C2, it should be normal at 12-25V.
Measure the voltage of C11, it is normal if it is less than 30V.
Measure C15 voltage, 12V is normal.
If the above voltage is abnormal, please check whether the transformer is powered, whether the tap is connected incorrectly, and whether the components are installed incorrectly. Repeat the above steps until the voltage is normal.
After the installation is checked and correct (the capacitor and diode at the output end must be installed; the TIP3055 should be installed on a large radiator), if you do not have an ammeter connected, please short-circuit the ammeter contact "A", and then turn on the power.
Please refer to the schematic diagram:
Measure the voltage of C1 and C2, it should be normal at 12-25V.
Measure the voltage of C11, it is normal if it is less than 30V.
Measure C15 voltage, 12V is normal.
If the above voltage is abnormal, please check whether the transformer is powered, whether the tap is connected incorrectly, and whether the components are installed incorrectly. Repeat the above steps until the voltage is normal.
Debugging process:
Adjust VR3 and VR4 so that the voltage of pins 2 and 6 of U2 chip is above 10V
Adjust VR3 and VR4 so that the voltage of pins 2 and 6 of U2 chip is above 10V
(Take pin 4 of U2 as the reference point).
The voltage across R17 should be the voltage after rectification and filtering by the first-stage tap of the transformer.
The A-RP current knob is adjusted to the middle, and the constant current indicator LED1 should not be on at this time.
Adjust V-RP, the voltage can be adjusted around 0-18V (R17 voltage), it is normal.
The output voltage is adjusted to the switching point voltage of the first-level relay
The voltage across R17 should be the voltage after rectification and filtering by the first-stage tap of the transformer.
The A-RP current knob is adjusted to the middle, and the constant current indicator LED1 should not be on at this time.
Adjust V-RP, the voltage can be adjusted around 0-18V (R17 voltage), it is normal.
The output voltage is adjusted to the switching point voltage of the first-level relay
(If you don't understand, go to the "Relay Switching Point Selection" above), adjust VR3 to make RL1 pull in, RL2 should not pull in at this time, and the voltage of R17 should be the voltage after rectification by the second-stage tap.
Adjust the output voltage to the switching point voltage of the second-level relay (if you don't understand, go to the "Relay Switching Point Selection"), adjust VR4 to make RL2 pull in, at this time, the voltage of R17 should be the voltage after the third-level tap rectification.
Adjust the output voltage and see if the 2 relays will pick up near the switching point. Repeat the above steps if it cannot be pulled in, and continue to be able to pull in.
Adjust V-RP to see the voltage output range, adjust V-RP to make the output voltage maximum, if the maximum voltage is not 30V, adjust VR2 to make the maximum voltage 30V.
Adjust V-RP to see the voltage output range, adjust V-RP to make the output voltage maximum, if the maximum voltage is not 30V, adjust VR2 to make the maximum voltage 30V.
Adjust constant current:
First, make sure that the adjustment tube has a large enough radiator and good heat dissipation.
Adjust the voltage to 5V, use the ammeter to tentatively short-circuit the output, and see if the constant current indicator LED1 is on?
If it does not light, there is a problem with the constant current circuit, check whether the components are installed incorrectly, and see if the LED1 is installed.
If it is on, it is short-circuited, adjust A-RP to the maximum short-circuit current, if the maximum current is not 5A, adjust VR1 to make the current to 5A.
First, make sure that the adjustment tube has a large enough radiator and good heat dissipation.
Adjust the voltage to 5V, use the ammeter to tentatively short-circuit the output, and see if the constant current indicator LED1 is on?
If it does not light, there is a problem with the constant current circuit, check whether the components are installed incorrectly, and see if the LED1 is installed.
If it is on, it is short-circuited, adjust A-RP to the maximum short-circuit current, if the maximum current is not 5A, adjust VR1 to make the current to 5A.
Regarding the VR5 of the temperature-controlled fan, when the radiator is hot to a certain extent, you think the cooling fan needs to work, and you can adjust the VR5 to make the fan work.
At this point, your power supply is ready to go.
Shipping list:
Adjustable voltage stabilized constant current power supply board parts X1
Adjustable voltage stabilized constant current power supply board parts X1
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