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A Direct Current (DC) power supply is a power supply circuit that converts Alternating Current (AC) or DC input power to DC power.
A DC power supply with AC input is sometimes called an AC-DC converter or AC adapter, while a DC power supply with DC input is called a DC-DC converter.
When it is called a DC power supply, it often refers to a programmable DC regulated power supply with AC input and variable output.

There are two types of DC-regulated power supplies: series type and switching type.

In this section, the circuit of a series method DC regulated power supply is shown.
A three-terminal regulator is used to keep the voltage constant, but the excess voltage must be discarded as heat, and cooling by a heat sink is required.

DC power supplies

Matsusada Precision manufactures and sells high precision and high performance DC power supplies from low voltage to high voltage.

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R3K-36 series

R3K-36 series

voltage range
8 to 36 V
current
1 to 3 A
power
24 to 36 W
World's smallest Programmable DC Power Supply

Quiet operation with Fan-less PSU

R4K-36 series

R4K-36 series

voltage range
2 to 40 V
current
0.1 to 4 A
power
0.2 to 36 W
Palm size DC Power Supply

Excellent quietness with natural air-cooling system

R4K-80 series

R4K-80 series

voltage range
16 to 320 V
current
0.5 to 10 A
power
80 W
Ultra slim, 4-digit, DC Power Supply

Various lineups for output current control at 0.1 mA increment

RK-80 series

RK-80 series

voltage range
16 to 320 V
current
0.5 to 10 A
power
80 W
Ultra Slim, 3-digit DC Power Supply

Excellent quietness with natural air-cooling system

R4GT series

R4GT series

voltage range
6 to 36 V
current
0.01 to 0.3 A
power
0.1 to 7.2 W
Ultra High Resolution Linear DC Power Supply

Pulse/Ramp various function, Ultra low noise

Discontinued

R4GE/R3GE series

R4GE/R3GE series

voltage
6 to 650V
current
0.1 to 10A
power
12 to 180W
Low Noise Linear DC Power Supply

Resolution of 1 mV and 0.1 mA

R4G/R4GN series

R4G/R4GN series

voltage range
6 to 650 V
current
0.1 to 10 A
power
12 to 180 W
Compact and High resolution
Linear DC power supply

High resolution and Ultra low noise, Digital interface

TB series

TB series

voltage range
35 to 1000 V
current
1 to 108 A
power
360W, 720W, 1080W
Wide range programmable
DC power supply

"Turbo function" installed, Compact, Suppressing voltage/current overshoot

RK series

RK series

voltage range
6 to 800 V
current
0.6 to 180 A
power
385 to 1200 W
Versatile benchtop
DC power supply

Available for 400 W output while being small size of only 2.8-inch in the width.

RKT series

RKT series

voltage range
80 to 650 V
current
8 to 100 A
power
1.6 kW
Programmable DC power supplies

Variable range output, "Turbo function" installed.

PVCE series

PVCE series

voltage range
6 to 650 V
current
1.2 to 600 A
power
0.75 to 15 kW
CVCC Programmable DC Power Supply

Ideal for research and development with low noise switching method.

PRKT series

PRKT series

voltage range
80 to 900 V
current
16.7 to 170 A
power
5 kW
Wide Range DC Power Supply

High Power Density and Maximum Output 5kW in 1U Size

REK/REKJ series

REK/REKJ series

voltage range
6 to 1500 V
current
1 to 1200 A
power
0.77 to 15 kW
Versatile, High-performance
DC power supply

Compact and High power, PFC circuit and universal input, Various operations is available

PRT series

PRT series

voltage range
80 to 1500 V
current
33 to 510 A
power
5 to 15 kW
High Power Wide Range DC Power Supply

Achieve a wide range of output, Variable internal resistance function

RE series

RE series

voltage range
10 to 650 V
current
1.2 to 1200 A
power
0.75 to 15 kW
147 models, programmable DC Power Supply

Low noise, High power, compact and high efficiency

REH series

REH series

voltage range
0.75 to 1.2 kV
current
1.1 to 20 A
power
1.1 to 15 kW
Max 1.2 kV high voltage and high power
DC Power Supply

Safety design, Outstanding small size in its class of 1kV/15kW

REKM series

REKM series

voltage range
10 to 650 V
current
46 to 6000 A
power
24 to 120 kW
High Power DC Power Supply

Space-saving 19-inch rack with 19.3 inch width

REM series

REM series

voltage range
10 to 1000 V
current
30 to 6000 A
power
20 to 120 kW
High Power DC Power Supply

High power up to 120 kW in a single rack, Slim with 19.3-inch width

PRTM series

PRTM series

voltage range
80 to 1500 V
current
60 to 4080 A
power
30 to 120 kW
High Power DC Power Supply

Slim and space-saving in 19-inch wide rack

VDD series

VDD series

voltage range
6 to 650 V
current
1.5 to 600 A
power
0.8 to 5 kW
Compact/High power DC-DC converter

High power and variable output, Low profile and lightweight design, Low noise