What are the common types of DC power supplies?

Power supply type: 1. Controlled rectification type, the output voltage is adjusted by changing the conduction time of the thyristor; 2. Chopping type, the input is a non-maintaining stable DC working voltage, and the output voltage is adjusted by changing the on-off of the switching circuit The ratio is to obtain one-way pulsating DC; 3. Inverter type, the unsteady DC working voltage is converted into high-frequency alternating current by the inverter, and then sampled through transformation, rectification, filtering, etc., and controlled by DC output voltage feedback; 4. Linear DC maintains a stable power supply, which is characterized by high stability, easy multi-channel output, and sustainable adjustment; 5. Switching DC regulated power supply; 6. Combined adjustable regulated power supply.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

DC power supply is a device that maintains a stable voltage and current in the circuit.

The DC power supply has two electrodes, positive and negative. The potential of the positive electrode is high and the potential of the negative electrode is low. When the two electrodes are connected to the circuit, a constant potential difference can be maintained between the two ends of the circuit, thereby externally A current flows from the positive pole to the negative pole in the circuit. A DC power supply is an energy conversion device that converts other forms of energy into electrical energy to supply circuits to maintain a steady flow of current.

Common DC power supply types

1. Controlled rectification type:

The output voltage is determined by changing the conduction of the thyristor. It will be adjusted through time.

2. Chopping type:

The input is a non-stable DC working voltage. By changing the on-off ratio of the switching circuit, one-way pulsating DC is obtained, and then filtered to obtain a stable DC working voltage. Voltage.

3. Frequency converter type:

The unsteady DC working voltage is converted into high-frequency alternating current by the inverter, and then sampled through transformation, rectification, filtering, etc., and fed back by the DC output voltage Control to achieve the purpose of maintaining stable DC operating voltage output.

4. Linear DC maintains stable power supply:

A major feature of power devices is that the adjustable tubes of the power devices work online and maintain stable output by adjusting the voltage drop between tubes. Due to the large static loss of the regulating tube, a large radiator needs to be installed for heat dissipation. And because the transformer runs at power frequency (50Hz), it weighs a lot.

This power supply has the characteristics of high stability, small ripple, high reliability, easy multi-channel output, and sustainable adjustment. The disadvantages are that they are large, heavy, and inefficient.

5. Switching DC regulated power supply:

Different from linear regulated power supply, a regulated power supply is a switching DC regulated power supply. Its circuit type mainly includes single-ended reverse Excitation, single-ended forward, half-bridge, push-pull and full-bridge. The key difference from linear power supply is that its transformer does not operate at the power frequency, but between tens of kilohertz and several megahertz.

The basic function tube does not operate in the saturation and cut-off areas, that is, in the switching state, so it is called a switching power supply. This power supply is small in size, relatively light in weight, and remains stable and reliable. The disadvantage is that the ripple is large (generally ≤1%VO), and a good 12mV (P-P) (P-P) is better than a linear power supply. Its power ranges from a few watts to several kilowatts. The selling price is 30,000-100,000 per watt.

6. Combined adjustable regulated power supply:

A high-precision DC voltage regulator with adjustable basic functions, continuously adjustable working voltage and current, and fully automatic conversion of voltage and current stability. , starting from 0 volts, the output voltage can be selected arbitrarily within the rated range, the protection point flow is limited, and the output power is continuously adjustable within the rated range. The operating voltage, current output and settings can be displayed on the LCD screen.

Different from ordinary power supplies on the market, the front stage of this power supply is a switching power supply, and a linear power supply is formed behind it. If the switching power supply and the linear power supply are put together and compared, the power supply has the characteristics of high precision, small ripples, good stability, high efficiency, no high-frequency radiation interference, and wide application range.

In this way, the shortcomings between the power supply and the switching power supply, which we all know are low in efficiency, easy to generate high heat, and large power supply ripple, are eliminated. This is also officially linear. One of the advantages of combining power supply and switching power supply.

Not only that, it also adopts microcomputer control, and can be connected to the computer to set the required working voltage and current value arbitrarily. Compared with the commonly used relay voltage-regulating transformer voltage-regulated DC power supply currently on the market, it has the advantages of high precision, small fluctuations, and stability.

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