What Is a Regulated Power Supply?

A stabilized voltage supply is an electronic device that provides stable AC or DC power to a load. It includes two types of AC stabilized power and DC stabilized power.

In 1955, American scientist GH Royer first developed a transistor-DC converter that used the saturation of a magnetic core to perform self-excited oscillation. Since then, various forms of continuous improvement have been emerging using this technology to improve the DC converter, which has replaced the rotating and mechanical transducers with short life, poor reliability, and low conversion efficiency. Because the power transistor in the transistor DC converter works in the switching state, the resulting stabilized power supply has a large number of groups, variable polarity, high efficiency, small size and light weight, so it was widely used at the time. Aerospace and military electronics. Since then

The power frequency AC power supply becomes a stable DC power after the transformer is stepped down, rectified and filtered. The rest of the figure is from voltage regulation to achieve regulated operation.

Component selection

R8 and R9 use lW metal film resistors, and the remaining resistors use 1 / 4W or l / 2W metal film resistors.

Commonly used regulated power supplies are:

Troubleshooting of stabilized power supply during use:

(1) Bursting of varistor

The varistor is bad;

The corresponding photocoupler is damaged;

The corresponding thyristor module is damaged;

The corresponding phase transformer is damaged.

(2) The fuse body is blown out, causing a failure sound and light alarm

The fuse is broken;

The corresponding photocoupler is damaged;

The corresponding thyristor module is damaged;

The phase-to-phase transformer is damaged.

(3) Acousto-optic alarm with phase failure

The phase of its input power is missing;

Phase loss transmission of machine line switch;

The sampling transformer is damaged;

The piezoelectric regulator is damaged.

(4) A certain voltage strobe indicator flashes

Its corresponding input voltage exceeds the regulation range;

Whether the corresponding cable plug can be tightened tightly;

The wire ends of the terminal blocks of the module board may be broken. ^[1]

The stabilized voltage power supply should be used in a ventilated and dry place indoor. Its use conditions are strict. The installation site should be free of gases, steam, chemical deposits, dust, greasy dirt and other explosive and corrosive media that seriously affect the insulation performance of the regulator. There should be no severe vibration bumps.

When the stabilized voltage power supply reaches the installation site, it should be installed lightly, and the voltage regulator should always be in a vertical upward state, and must not withstand wind, snow, ice, and hail.

Before commissioning and installing the stabilized voltage power supply, you must first check that all parts of the equipment are intact, and the fixing parts should be firm and reliable. Reconfirm whether the voltage of the occasion of use matches the voltage of the regulator. This equipment is a three-phase four-wire system with phase-phase adjustment. Method, the reliability of the neutral (zero) connection of the system is relatively high, and the contact resistance of the neutral (zero) connection should be reduced as much as possible. This equipment must be well connected to the ground. The ground wire cannot be used together with the repeated ground wire of the power system (the neutral wire and the side opposite the ground wire) to ensure safety and improve anti-interference performance. ^[1]

1. In order to prevent magnetic leakage interference, the distance between the regulator and the equipment used should not be less than 2 meters. Various magnetic records, discs, cards, etc. should be kept 2 meters away from the machine to prevent accidental magnetization.

2. The voltage stabilizer generally includes input terminals (A, B, C), output terminals (a, b, c, n), shields, and iron core shell ground terminals. These terminals have been correctly connected in the voltage stabilization system.

3. If the load imbalance exceeds 20%, a resistive load is connected in parallel at one phase of the light load to balance it. Similarly, if the imbalance of the line voltage at the input is greater than 10%, the voltage regulation performance of the machine will also be affected. At this time, a single-phase voltage regulator should also be set from the input terminal to make the line voltage at the input terminal basically balanced. The balance between the input voltage and load does not exceed the above range, and the output line voltage unbalance is 5%.

4. When there is a short circuit in the load equipment, the user should shut down and check, and then turn on the machine after eliminating the short circuit fault.

5. When the continuous working time is long, the machine has a certain temperature rise, and its indicated value will drop slightly, which is slightly lower than the actual voltage value.

6. It should be placed in a place with good ventilation. If the ventilation is poor, please install a ventilator in the room. ^[1]