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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 power supply with AC input and variable output.

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

In this section, the circuit of a series method 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
Palmtop-sized 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 models 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
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 the small size of only 2.8-inch in 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
1.2 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 are available
PRT series

PRT series

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

Achieve a autoranging 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