Last updated on July 22nd, 2019
Let’s discuss our DC coupling definition as well as a few examples of DC coupling in practical use.
What is DC Coupling?
Direct Current (DC) coupling which is also called conductive coupling is the process of transferring electrical energy through physical contact means using a conductive medium. It is a means of connecting two circuits whereby, apart from moving the AC signal, the initial stage provides DC bias to the second stage.
It, therefore, means that there is no need for a DC blocking capacitor which is required to filter the signal. It involves linking two circuits to pass the full frequencies spectrum including the direct current. DC coupling or conductive coupling is done by a wire, a resistor or using a common terminal, for example, a metallic bonding and a binding post.
DC Coupling Definition and Examples
In DC coupling nothing is filtered and it allows both AC and DC signals to pass through any connection. DC coupling is the opposite of AC coupling in which the circuit is usually designed to filter out low frequencies.
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Benefits of DC Coupling
Here are the various benefits of DC coupling as part of our DC coupling definition.
- One advantage of direct coupling is that it has a perfect low-frequency response, often from DC and also from the highest operating frequency that the system can permit. All applications such as those from thermistors, thermocouples, and strain gages among others need monitoring of slowly fluctuating signals and must have perfect DC amplification that has minimum offset errors. Therefore they must always use direct-coupled systems and have offset correction incorporated.
- The low initial investment cost of DC-coupled systems makes them more preferable to new installations since solar and batteries use a similar inverter.
- Unlike the AC coupled system, DC coupling performs with higher battery charging efficiencies and has better control coordination.
- DC Coupling benefits or drawback depending on the application of direct coupling is that any DC at the input appears to be a valid signal to the system, and therefore it is moved from the input to the output.
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