Is it possible for power supplies with different voltages to be co located?

Power supplies with different voltages can be co-grounded, but grounding needs to consider distribution parameters, especially at high power and high frequencies.

You can refer to "Single-point Grounding Technology" and "Multi-point Grounding Technology".

1) Digital circuits.

Separate from analog circuits There are both high-speed logic circuits and linear circuits on the circuit board, so they should be separated as much as possible, and the ground wires of the two should not be mixed, and they should be connected to the ground wires of the power supply side. In addition, it is necessary to maximize the ground area of the linear circuit.

2) Bold grounding wire.

If the grounding wire is very thin, the grounding potential will change with the change of current, resulting in the unstable timing signal level of the electronic equipment and the deterioration of noise immunity. Therefore, the ground wire should be thickened as much as possible so that it can pass through three times as much as the printed circuit board.

of allowable currents. If possible, the width of the ground wire should be greater than 3 mm

3) The grounding wire forms a closed-loop circuit When designing a flooring system of printed circuit board composed only of digital circuits, making the grounding wire into a closed-loop circuit can significantly improve the anti-noise ability. The reason for this is that there are many integrated circuits on printed circuit boards.

Components, especially those that consume a lot of power, will have a large potential difference in the ground junction due to the limitation of the thickness of the ground wire.

If the grounding structure is looped, the potential difference will be narrowed and the noise immunity of electronic equipment will be improved.

4) When the multi-layer circuit board design is adopted, one of the layers can be used as the "full ground plane", which can reduce the grounding impedance and play a shielding role at the same time. We're often on printed boards.

A wide ground line around the perimeter also serves the same purpose.

Yes, but if it is direct current, because the voltage of the two wires is different for different cycles.

Different voltage sources can be co-ground if they are suspended to ground at both ends. Otherwise, it won't work.

For DC voltages, of course, it can be co-grounded.

1. The power supply is different.

The two voltages of the power module are not in common with each other, and the two power supplies are isolated from each other, and can be independently powered for the equipment that needs to be isolated from each other. Whereas co-ground output cannot.

2. Use differently.

The power supply of the power module with two output voltages of different voltages has the flexibility of one answer, for example, it can be applied in series to obtain a higher working power supply voltage; It can form a positive and negative weight power supply; It is also possible to form two power sources that are co-located. Whereas co-ground output cannot.

In addition, the isolation module has a transformer to achieve isolation, while the non-isolated one can be separated as long as there is an inductance and capacitor, and a transformer is not necessarily needed.

The isolation module must have a transformer, otherwise it is impossible to achieve isolation, and the non-isolated one can be as long as there is inductance and capacitance, and the transformer is not necessarily needed.

As far as the power supply itself goes, it doesn't make much difference.

From the perspective of use, these two power supplies are isolated from each other without common ground output, and can be independently powered for devices that need to be electrically isolated from each other. Whereas co-ground output cannot.

The power supply with non-common ground output has a certain flexibility in use, for example, it can be applied in series to obtain a higher working power supply voltage; It can form a positive and negative power supply; It is also possible to form two power sources that are co-located.

To be in common is to share a common land.

Because when a group of electronic instruments is working at the same time, even if they use the same power supply, due to the different circuit designs of the electronic instruments (even if they are the same two instruments, due to the difference in the quality of the components), there will be a small potential difference between the electronic instruments.

or discrete capacitance, which can interfere with the measured readings of the target being measured. As today's electronics become more sophisticated, even the slightest interference can seriously affect the accuracy of the measurement results.

especially high-frequency electronics). Therefore, when a group of electronic instruments work together at the same time, it must be co-located in order to minimize interference. In some projects, this is not enough, and some also use high-precision power supplies to power electronic instruments.

Just as the altitude reference point is sea level, or the local ground, you can determine the altitude of different positions, and a circuit system must also have a zero potential point, that is, a grounding point, sometimes not necessarily to the ground, but only to the negative pole of the positive power supply, or to the chassis.

The input signal and the output signal share a common grounding point.