How can a power supply output voltage be changed?
The power supply output voltage can be changed by either changing the scaling factor of the feedback voltage, injecting a trimming signal into the feedback node, or changing the reference voltage.
What does trimming a power supply mean?
Trimming the output voltage of a power supply simply means adjusting the voltage by a small amount. By convention, the term trimming is used for applications where the power supply has a specified nominal output voltage and the user is able to change the output voltage by about ten percent or less.
How does a voltage source with a high output impedance work?
A voltage source with a high output impedance can be constructed by the user placing a high impedance resistor network between the output voltage of the power supply and ground. A node of this external resistor network is then connected to the internal feedback node pin and thus injects the proper current to trim the power supply output voltage.
How do you trim the output voltage of a power supply?
The most common methods of trimming the output voltage of power supplies are to inject a current (a voltage source with a high output impedance) into the feedback node or to change the value of an impedance element in the feedback network. The following are methods to implement output voltage trimming in power supplies.
How does a power supply 'pot' work?
The 'pot' is made available to the user to trim the power supply output voltage. The power supply design team provides a pin connected to an internal signal conditioning circuit which drives the internal feedback node.
What are the different types of power supplies?
Some power supplies are available with the output voltage specified as a range rather than a nominal value and the output voltage can be adjustable over a ratio as great as 1:100. These types of supplies are often labeled as variable, adjustable, or laboratory power supplies.
Changing the Output Voltage of a Cheap Power
Changing the Output Voltage of a Cheap Power Supply: This instructable show how to change parts inside a small power supply to chnage the output voltage to suite your needs.
Why does my voltage from the DC supply box
Your power supply has settable current limit. It is set to some value and your load tries to draw more, so the current limit is reached and the supply adjusts the output voltage down in order to keep the current at the set limit.
Trimming the Output Voltage of a Power Supply | Bel
The power supply output voltage can be changed by either changing the scaling factor of the feedback voltage, injecting a trimming signal into the feedback node, or changing the reference voltage.
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Changing the Output Voltage of a Cheap Power Supply
Changing the Output Voltage of a Cheap Power Supply: This instructable show how to change parts inside a small power supply to chnage the output voltage to suite your needs.
Why does my voltage from the DC supply box change on its own?
Your power supply has settable current limit. It is set to some value and your load tries to draw more, so the current limit is reached and the supply adjusts the output voltage
Trimming the Output Voltage of a Power Supply | Bel
The power supply output voltage can be changed by either changing the scaling factor of the feedback voltage, injecting a trimming signal into the feedback node, or changing
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Learn how high and low voltage scenarios impact industries like renewable energy, construction, and emergency services, with practical solutions and real-world case studies to ensure system
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Changing the Output Voltage of a Cheap Power Supply: This instructable show how to change parts inside a small power supply to chnage the output voltage to suite your needs.
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