What does an isolated power supply do? In some cases, isolation refers to the electrical isolation between input and output, input and ground, and output and output. The function of isolation is to protect the safety of the system. When there is interference or pulse at one end, it will not affect the other due to mutual isolation. part.

In laboratories or high-demand occasions, for the safety of the experimenters, the input power supply of the experiment is generally isolated from the mains by a 1:1 power frequency transformer. In this way, no matter which line of the line the laboratory experimenter encounters There is no risk of electric shock because the isolated power supply is not connected to the ground.

In industrial control equipment, it is sometimes required to isolate the power supply ground wire between the two systems, such as isolating ground wire noise, isolating high common-mode voltage, etc., using a DC converter with a transformer to separate the two power supplies so that the They are independent of each other to achieve the above purpose!

Each module is powered independently to prevent one module from being damaged due to high voltage discharge or other reasons and affecting other modules. The purpose of this is to ensure that each module works independently without interference.

Isolation refers to the isolation of the input end and the output end with an isolation transformer, which may be power frequency or high frequency. But it can isolate the input and output. The risk of electric shock can be avoided.

Isolation is divided into several categories:

Isolation at both ends: the input and output are isolated from each other

Three-terminal isolation: input, output, power

Four-terminal isolation: signal input, signal output, power input, isolated power output

The main functions of the isolated power module:

1. Safety isolation: strong and weak current isolation IGBT isolation drive surge isolation protection lightning isolation protection (such as isolation protection of medical electronic equipment in contact with human body);

2. Noise isolation: (isolation of analog circuits and digital circuits, isolation of strong and weak signals);

3. Ground loop elimination: Distributed power supply system for remote signal transmission.

4. Voltage conversion

Boost conversion Buck conversion AC/DC conversion (AC/DC, DC/AC) Polarity conversion (positive and negative polarity conversion, single power supply and positive and negative power conversion, single power supply and multi power supply conversion).

Regulated AC mains power supply Remote DC power supply Distributed power supply system battery power supply.

When should isolated power supplies be used? details as following:  

1. Purify the power supply.

In the original power distribution system, there are some loads such as mechanical equipment, high-frequency equipment, spark machines, etc. These loads often modulate and interfere with the power supply, such as the inrush current generated by the start and stop of heavy-load equipment on the line. , some of the second harmonics generated by the equipment itself are in turn carried on the power supply, etc. Some equipments (such as precision instruments, etc.) that require relatively high power quality require the use of isolated power supplies.

2. Safe power supply.

The neutral point of the three-phase power supply sent by the power plant is connected to the earth, and the neutral line of the low-voltage side is actually grounded. In this way, if the human body touches the live line and the ground, it is equivalent to a loop with the power distribution system. Dangerous, isolated power supply is used in some specific occasions for safety. It is isolated from the original power distribution system. Not co-located with the original system.

In some laboratories or high-demand occasions, for the safety of the experimenters, the input power supply of the experiment is generally isolated from the mains by a 1:1 power frequency transformer. There is no risk of electric shock at all, because the isolated power supply is not connected to the ground.

In industrial control equipment, it is sometimes required to isolate the power supply ground wire between the two systems, such as isolating ground wire noise, isolating high common-mode voltage, etc., using a DC converter with a transformer to separate the two power supplies so that the They are independent of each other, so as to achieve the above purpose, each module is powered independently, preventing one module from being damaged by high voltage discharge or other reasons and causing other modules to suffer. The purpose of this is to ensure that each module works independently without interference.