Showing posts with label power supply schematic. Show all posts
Showing posts with label power supply schematic. Show all posts

1.2 volts power supply

This switch mode power supply circuit require an input voltage range , between 4.5V to 16V,and will provide a very stable output voltage of 1.2 volt . The LTM4627 supports an output voltage range of 0.6V to 5V, set by a single external resistor , so you can modify the output voltage .


High switching frequency and a current mode architecture enable a very fast transient response to line and load changes without sacrificing stability.
 

1.2 volts power supply READ MORE...

1.2 volts power supply

This switch mode power supply circuit require an input voltage range , between 4.5V to 16V,and will provide a very stable output voltage of 1.2 volt . The LTM4627 supports an output voltage range of 0.6V to 5V, set by a single external resistor , so you can modify the output voltage .


High switching frequency and a current mode architecture enable a very fast transient response to line and load changes without sacrificing stability.
 

1.2 volts power supply READ MORE...

6V to 12V Converter Circuit with BD679 - BC547

6V to 12V Converter Circuit with BD679- BC547

This is a design circuit for converter circuit. This circuit is based on transistor as controller the circuit. There are two types of transistor that is BC547 and BD679. This circuit is a simple design of converter or inverter. This is the figure of the circuit.

This inverter circuit can to 800mA of 12V power supply with a 6V. For example could you 12V Car Accessories (UK turning into a 6V?) Car. The circuit is simple, more than 75% efficiency and very helpful. By changing a few components you, you also change for different voltages.

Electronic Part List

R1, R4 2 .2 K 1/4W Resistor

R2, R3 47K 1/4W Resistor

R5 1K 1/4W Resistor

R6 15K 1/4W Resistor

R7 33K 1/4W Resistor

R8 10K 1/4W Resistor

C1, C2 0.1uF Ceramic Disc Capacitor

C3 470uF 25V electrolytic capacitor

1N914 diode D1

D2 Diode 1N4004

D3 12V 400mW Zener Diode

Q1, Q2, Q4 BC547 NPN transistor

BD679 NPN transistor Q3

L1 See Notes

Notes

1. L1 is a custom inductor wound with about 80 turns 0.5 mm magnet wire a ring around the core with an outer diameter of 40 mm.



2. Different values of D3 can be used to obtain different output voltages from 0.6V to 30V is about. Note that at higher voltages, the circuit could perform just as well and can not produce much electricity. You may need to use a larger C3 for higher voltages and / or higher currents.



3. You can use a larger value for C3, in order to achieve a better filtering.



4. The circuit requires about 2A from the 6V supply to provide the full 800mA at 12V. READ MORE...

6V to 12V Converter Circuit with BD679 - BC547

6V to 12V Converter Circuit with BD679- BC547

This is a design circuit for converter circuit. This circuit is based on transistor as controller the circuit. There are two types of transistor that is BC547 and BD679. This circuit is a simple design of converter or inverter. This is the figure of the circuit.

This inverter circuit can to 800mA of 12V power supply with a 6V. For example could you 12V Car Accessories (UK turning into a 6V?) Car. The circuit is simple, more than 75% efficiency and very helpful. By changing a few components you, you also change for different voltages.

Electronic Part List

R1, R4 2 .2 K 1/4W Resistor

R2, R3 47K 1/4W Resistor

R5 1K 1/4W Resistor

R6 15K 1/4W Resistor

R7 33K 1/4W Resistor

R8 10K 1/4W Resistor

C1, C2 0.1uF Ceramic Disc Capacitor

C3 470uF 25V electrolytic capacitor

1N914 diode D1

D2 Diode 1N4004

D3 12V 400mW Zener Diode

Q1, Q2, Q4 BC547 NPN transistor

BD679 NPN transistor Q3

L1 See Notes

Notes

1. L1 is a custom inductor wound with about 80 turns 0.5 mm magnet wire a ring around the core with an outer diameter of 40 mm.



2. Different values of D3 can be used to obtain different output voltages from 0.6V to 30V is about. Note that at higher voltages, the circuit could perform just as well and can not produce much electricity. You may need to use a larger C3 for higher voltages and / or higher currents.



3. You can use a larger value for C3, in order to achieve a better filtering.



4. The circuit requires about 2A from the 6V supply to provide the full 800mA at 12V. READ MORE...

18v power supply USING LM350T

18v power supply USING LM350T

This is a classic linear power supply which produces a regulated 18v, rated at about 1 amp.

POWERSUPPLY



18V / 1 AMP POWER SUPPLY

READ MORE...

18v power supply USING LM350T

18v power supply USING LM350T

This is a classic linear power supply which produces a regulated 18v, rated at about 1 amp.

POWERSUPPLY



18V / 1 AMP POWER SUPPLY

READ MORE...

7805 power supply

5V power supply using 7805

7805 is a 5V fixed three terminal positive voltage regulator IC .The IC has features such as safe operating area protection,thermal shut down, internal current limiting which makes the IC very rugged.Out out currents up to 1A can be drawn from the IC provided that there is a proper heat sink.A 9V transformer steps down the main voltage , 1A bridge rectifies it and capacitor C1 filters it and 7805 regulates it to produce a steady 5V DC .

Circuit diagram with Parts list.

powersupply

Notes.


The bridge D1 can be also made by yourself by using four 1N 4007 diodes.

If more than 400mA current is supposed to be taken from the circuit , fit a heat sink with to the 7805 IC. READ MORE...

7805 power supply

5V power supply using 7805

7805 is a 5V fixed three terminal positive voltage regulator IC .The IC has features such as safe operating area protection,thermal shut down, internal current limiting which makes the IC very rugged.Out out currents up to 1A can be drawn from the IC provided that there is a proper heat sink.A 9V transformer steps down the main voltage , 1A bridge rectifies it and capacitor C1 filters it and 7805 regulates it to produce a steady 5V DC .

Circuit diagram with Parts list.

powersupply

Notes.


The bridge D1 can be also made by yourself by using four 1N 4007 diodes.

If more than 400mA current is supposed to be taken from the circuit , fit a heat sink with to the 7805 IC. READ MORE...

12vdc power supply

12vdc power supply

12Volt DC Power Supply
D1 = BRDIGE
C1 = 2000UF / 25V
R1 = 200 R
D2 = IN759
R2 = 10K
Q1 =2N3053


READ MORE...

12vdc power supply

12vdc power supply

12Volt DC Power Supply
D1 = BRDIGE
C1 = 2000UF / 25V
R1 = 200 R
D2 = IN759
R2 = 10K
Q1 =2N3053


READ MORE...

switchmode power supply

switchmode power supply

A Switchedmode power supply (also Switchingmode power supply, SMPS, or simply Switcher) is an electronic Power Supply Unit (PSU) that incorporates a switching regulator in order to provide the required output voltage. An SMPS is actually a power converter that transmits power from a source (e.g., a battery or the electrical power grid) to a load ( a personal computer) with ideally no losses. The function of the converter is to provide a reliable output voltage often at a different level than the input voltage.


When mechanical shafts are rotating, a simple gear train can deliver power to a shaft at one speed from a shaft at a different speed. However, fluid power can be converted from a source with one pressure–flow ratio to another pressure–flow level without rotation by using the switching action of a hydraulic ram. Similarly, when AC power is being delivered from an AC source, a simple transformer can be used to convert power at one voltage level to power at another voltage level with low losses. Likewise, the switched action of an SMPS can convert DC power with low losses.
 
Switching-Mode Power Supply Design
This site is dedicated to switching-mode power supply circuit designers. Here you will find solutions to the most difficult problems facing you as a power supply designer, a tutorial that places power supply design problems in context, and resources that aid in your power supply design tasks. If you are a first-time visitor you will want to read this page as an orientation. If you have been here before (thank you for coming back), use the menu on the right to find the power supply design information you need.
 
Power Supplies Reference Manual and Design Guide
in the SWITCHMODE Power Supplies Reference Manual and Design Guide should ...... SWITCHMODE power supplies. The ICs for Switching Power Supplies figure
 
 
Switch Mode Power Supplies
SwitchMode Power Supplies: From Circuit Theory to the Workbench. Michael Tse ... To show how a switchmode power supply can be ..
 
 
Efficient Switchmode Power Supply Start-Up Circuit
Introduction


The purpose of this application note is to demonstrate the many advantages of using the Supertex LND150N3 in the

start-up circuit for switchmode power supplies.

Commonly used low voltage bipolar, CMOS and BiCMOS switchmode power supply PWM ICs usually operate from

supply voltages of up to 18V. When the input power for the switchmode converter is available at voltages higher than

the maximum voltage rating of the IC, the voltage has to be reduced with a start-up circuit. A frequent requirement is

for operation directly from a rectified 120V or 240V AC line without the use of tap changing switches for the selection of different voltages.
 
 
 
  READ MORE...

switchmode power supply

switchmode power supply

A Switchedmode power supply (also Switchingmode power supply, SMPS, or simply Switcher) is an electronic Power Supply Unit (PSU) that incorporates a switching regulator in order to provide the required output voltage. An SMPS is actually a power converter that transmits power from a source (e.g., a battery or the electrical power grid) to a load ( a personal computer) with ideally no losses. The function of the converter is to provide a reliable output voltage often at a different level than the input voltage.


When mechanical shafts are rotating, a simple gear train can deliver power to a shaft at one speed from a shaft at a different speed. However, fluid power can be converted from a source with one pressure–flow ratio to another pressure–flow level without rotation by using the switching action of a hydraulic ram. Similarly, when AC power is being delivered from an AC source, a simple transformer can be used to convert power at one voltage level to power at another voltage level with low losses. Likewise, the switched action of an SMPS can convert DC power with low losses.
 
Switching-Mode Power Supply Design
This site is dedicated to switching-mode power supply circuit designers. Here you will find solutions to the most difficult problems facing you as a power supply designer, a tutorial that places power supply design problems in context, and resources that aid in your power supply design tasks. If you are a first-time visitor you will want to read this page as an orientation. If you have been here before (thank you for coming back), use the menu on the right to find the power supply design information you need.
 
Power Supplies Reference Manual and Design Guide
in the SWITCHMODE Power Supplies Reference Manual and Design Guide should ...... SWITCHMODE power supplies. The ICs for Switching Power Supplies figure
 
 
Switch Mode Power Supplies
SwitchMode Power Supplies: From Circuit Theory to the Workbench. Michael Tse ... To show how a switchmode power supply can be ..
 
 
Efficient Switchmode Power Supply Start-Up Circuit
Introduction


The purpose of this application note is to demonstrate the many advantages of using the Supertex LND150N3 in the

start-up circuit for switchmode power supplies.

Commonly used low voltage bipolar, CMOS and BiCMOS switchmode power supply PWM ICs usually operate from

supply voltages of up to 18V. When the input power for the switchmode converter is available at voltages higher than

the maximum voltage rating of the IC, the voltage has to be reduced with a start-up circuit. A frequent requirement is

for operation directly from a rectified 120V or 240V AC line without the use of tap changing switches for the selection of different voltages.
 
 
 
  READ MORE...

0 - 300V Adjustable Power Supply

0 - 300V Adjustable Power Supply



Introduction


To prevent my high voltage experiments to go up in smoke completely, I designed
a simple circuit which can provide an adjustable voltage source of 0 to 330 Volt..
The supply is short-ciruit proof: the current is limited to about 100mA.

Circuit description

TR1 is a 1:1 mains transformer; it is included for safety.

The mains voltage from TR1 is rectified with bridge D1 (1Amp / 500V) and large elcap C1.

T1 is switched as a source follower: the source of T1 will follow the voltage of the
wiper of R3. D2 is included to protect the gate of T1; although in theory not necessary
I strongly recommend to include it!

T2 and shunt resistor R2 build the current limiter. When the output current becomes too high, T2 will discharge
the gate of T1. This will prevent the current to become too high.
The value of R3 has been determined experimentally; it depends also on the Hfe of T2 so you may need to tune the value of R2.

Note that T1 needs a large heatsink: in worst case T1 will dissipate 330V x 100mA = 33Watt!
Instead of a BUZ 326 (400V/10.5Amp) you can also use an IRF740 (400V/10Amp).
The output impedance of the power supply is determined by the beta of T1, so the larger the MOSFET
the lower the output impedance!


READ MORE...

0 - 300V Adjustable Power Supply

0 - 300V Adjustable Power Supply



Introduction


To prevent my high voltage experiments to go up in smoke completely, I designed
a simple circuit which can provide an adjustable voltage source of 0 to 330 Volt..
The supply is short-ciruit proof: the current is limited to about 100mA.

Circuit description

TR1 is a 1:1 mains transformer; it is included for safety.

The mains voltage from TR1 is rectified with bridge D1 (1Amp / 500V) and large elcap C1.

T1 is switched as a source follower: the source of T1 will follow the voltage of the
wiper of R3. D2 is included to protect the gate of T1; although in theory not necessary
I strongly recommend to include it!

T2 and shunt resistor R2 build the current limiter. When the output current becomes too high, T2 will discharge
the gate of T1. This will prevent the current to become too high.
The value of R3 has been determined experimentally; it depends also on the Hfe of T2 so you may need to tune the value of R2.

Note that T1 needs a large heatsink: in worst case T1 will dissipate 330V x 100mA = 33Watt!
Instead of a BUZ 326 (400V/10.5Amp) you can also use an IRF740 (400V/10Amp).
The output impedance of the power supply is determined by the beta of T1, so the larger the MOSFET
the lower the output impedance!


READ MORE...

power supply schematic - Gyrator Circuit

power supply schematic - Gyrator Circuit


Description
An electronic recitification circuit. The use of large, heavy and expensive electrolytic capacitors is avoided, being replaced by an active transistor in this gyrator circuit.




Circuit Notes
To avoid excess ripple output on a power supply feeding a heavy load, usually a large value capacitor is chosen following the rectifier. In this circuit, C1's value is only a 470uF. The gyrator circuit works on the principle that the value of input capacitance at the base-emitter terminals of a transitor is effectively multiplied by the static forward current gain, HFE of the transistor. In this circuit C2, a 100uF capacitor is effectively magnified at the ouput ( Vreg ).

If you assume a dc current gain, HFE of 50 for the 2N3055 power transistor, then the effective value of the smoothing capacitor would be 50x this value; or be the same as using a 5000uF capacitor without the power transistor. The graph below shows the output voltage and current through the load :-



The load draws nearly 400mA. With the output directly from the rectifier there is about 5v pk-pk ripple in the output. Using the output at the emitter of the transistor things are much better. The circuit will take a few hundred milliseconds for the output voltage to stabilize and reach maximum value. The advantages are that a smaller, less costly reservoir capacitor can be used with this circuit to give a high quality READ MORE...

power supply schematic - Gyrator Circuit

power supply schematic - Gyrator Circuit


Description
An electronic recitification circuit. The use of large, heavy and expensive electrolytic capacitors is avoided, being replaced by an active transistor in this gyrator circuit.




Circuit Notes
To avoid excess ripple output on a power supply feeding a heavy load, usually a large value capacitor is chosen following the rectifier. In this circuit, C1's value is only a 470uF. The gyrator circuit works on the principle that the value of input capacitance at the base-emitter terminals of a transitor is effectively multiplied by the static forward current gain, HFE of the transistor. In this circuit C2, a 100uF capacitor is effectively magnified at the ouput ( Vreg ).

If you assume a dc current gain, HFE of 50 for the 2N3055 power transistor, then the effective value of the smoothing capacitor would be 50x this value; or be the same as using a 5000uF capacitor without the power transistor. The graph below shows the output voltage and current through the load :-



The load draws nearly 400mA. With the output directly from the rectifier there is about 5v pk-pk ripple in the output. Using the output at the emitter of the transistor things are much better. The circuit will take a few hundred milliseconds for the output voltage to stabilize and reach maximum value. The advantages are that a smaller, less costly reservoir capacitor can be used with this circuit to give a high quality READ MORE...