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DC Power Supplies
8 Series · 163 Models
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DC Power Supplies Overview
Switching DC power supplies convert AC mains into regulated DC output using high-frequency conversion for high efficiency and compact size. QDTB supplies range from 25 W to tens of kilowatts with fixed or adjustable output (5 V/12 V/24 V/48 V and custom levels). Series include compact switching units, large adjustable models, and LDP/LDY/LDK heavy-industrial types, serving industrial automation, LED lighting, telecom, security systems, electronics, and laboratories.
Available Series
Small-Switching Series
Compact switching mode DC power supplies for low-power industrial applications, featuring high efficiency and reliable performance in a small form factor.
Large-Adjustable Series
High-capacity adjustable DC power supplies for industrial processes requiring variable voltage and current output, including electroplating and electrolysis applications.
LDP Series
The LDP series low voltage DC power supplies are designed for applications requiring stable low voltage DC output with high current capability.
LDY Series
The LDY series precision DC power supplies provide highly stable and precise DC output for laboratory and industrial measurement applications.
LDK Series
The LDK series industrial DC power supplies are ruggedized power sources for harsh industrial environments, providing reliable DC power for control systems and actuators.
GZDW DC Power Systems Series
The GZDW series microcomputer-controlled DC power systems provide the dedicated operating power supply (110V or 220V DC) required by switchgear, protection relays, and control equipment in substations and switching stations. Rated battery capacity 10–200 Ah with high-frequency switching charger modules in N+1 redundant configuration, automatic battery management, and microprocessor-based monitoring of busbar voltage, insulation, and charge/discharge state.
Integrated Distributed Power Supplies Series
Integrated distributed DC power supplies embed the DC operating supply (battery, charger and distribution) directly at each bay or switchgear panel, avoiding a central battery room. Rated 110/220V DC for substations and distribution automation, with battery backup integrated into each cabinet.
Telecom Rectifier Systems Series
Telecom rectifier systems convert AC mains to -48V DC for telecom and data communication equipment, with battery backup and N+1 rectifier redundancy. Rated 48V DC up to 1000A, with hot-swappable rectifier modules, battery management and remote monitoring for base stations and exchanges.
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Application Scenarios
Electroplating
High-current, low-voltage DC for electroplating and anodising lines.
Industrial Automation
Stable 24V DC for PLC, sensors, and control networks.
LED Lighting
Constant-voltage drivers for LED strips, signs and industrial lighting.
Telecommunications
Reliable DC for telecom, networking and transmission equipment.
Security Systems
Power for CCTV, access control and alarm systems.
Laboratory & R&D
Adjustable, regulated DC for experiments and product development.
Technical Advantages
High-Frequency Switching
Compact, efficient design with high power density.
Adjustable Output
Fixed or adjustable voltage and current to suit the application.
Wide Power Range
From 25W small units to tens of kilowatts for heavy industry.
Comprehensive Protection
Overload, over-voltage, short-circuit and thermal protection.
FAQ - DC Power Supplies
What is the difference between a switching and a linear power supply?
Should I choose fixed or adjustable output?
Can power supplies be connected in parallel?
What capacity and voltage range is available for DC Power Supplies?
What is the minimum order quantity (MOQ) for DC Power Supplies?
What is the delivery time for DC Power Supplies?
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Switching vs Linear vs SCR Power Supply: How to Choose
| Switching (SMPS) | Linear | SCR / Thyristor | |
|---|---|---|---|
| Efficiency | Highest, because the switching stage wastes little | Low, with the difference dissipated as heat | Good at high current, lower at light load |
| Size & weight | Compact and light for the same output | Bulky, dominated by the mains transformer | Large, with a big transformer and heat sink |
| Ripple & noise | Low ripple, with switching noise to filter | Lowest ripple and noise of the three | Higher ripple, often acceptable for plating |
| Regulation speed | Fast response to load steps | Fast, but limited by the pass device | Slower, because the thyristor fires per half cycle |
| Output range | Wide, from a few watts to tens of kilowatts | Suited to low and moderate power | Built for high current at low voltage |
| Heat | Low dissipation, so a small enclosure works | High dissipation, so the room must be cooled | Moderate, with water cooling on large units |
| Typical application | Automation, LED, telecom and security systems | Laboratory and low-noise instrumentation | Electroplating, anodising and electrolysis |
Where QDTB® DC Power Supplies Are Specified
Switching supplies are specified wherever a panel or a machine needs a regulated DC rail: industrial automation, LED lighting drivers, telecom and security systems, and laboratory benches where the output has to be set and held. The compact size is what lets the supply sit inside the same enclosure as the equipment it feeds.
Electroplating and anodising lines take the SCR and thyristor types, because the process needs high current at low voltage and the ripple requirement is set by the coating quality rather than by electronics. Those units are sized on the bath current and the duty cycle, not on a generic wattage.
Adjustable models serve development and testing, where the same bench has to produce different voltages for different builds. Current-sharing models are paralleled where the total load exceeds a single unit, which keeps the spare-part list short.
The range covers 25 W to tens of kilowatts with fixed or adjustable outputs at the common automation voltages. Units are built to GB/T 17478 and IEC 61204, with the enclosure and cooling agreed against the ambient of the panel they go into.
Frequently Asked Questions
What is the difference between a switching and a linear power supply?
Switching supplies are smaller, lighter and more efficient. Linear supplies have lower noise but are bulkier and less efficient.
Should I choose fixed or adjustable output?
Fixed for a known voltage (e.g. 24V automation). Adjustable for testing, development or applications needing flexibility.
Can power supplies be connected in parallel?
Yes, models with current-sharing support parallel operation to increase total power.
What capacity and voltage range is available for DC Power Supplies?
QDTB® supplies DC Power Supplies from 25 to 100,000 W.
What is the minimum order quantity (MOQ) for DC Power Supplies?
One unit for standard products. Custom-designed equipment is quoted on specifications — send your parameters or drawings and our sales team will confirm the MOQ for your configuration.
What is the delivery time for DC Power Supplies?
Standard units are delivered in 30-45 days. Custom or large-capacity units follow a project-specific schedule confirmed at quotation. Rush orders can be accommodated for urgent projects.