Switching Power Supplies: High Efficiency, Compact Sizes
Switching or switched-mode power supplies (SMPS) offer advantages of better efficiency in smaller form factors compared to their linear counterparts. For these features, they are preferred in consumer electronics, telecom, industrial equipment and high-power applications.
With miniaturization still a trend, manufacturers are working on raising the performance levels of products further while continuing to shrink their sizes. In China, some suppliers have achieved 0.3W maximum no-load power consumption and exceeded 87 percent efficiency, meeting the standards of EU CoC V5 and US DoE VI/CEC VI.
Typical switching power supplies from Chinese companies are isolated and nonisolated types in wall-mount and desktop designs. These have 100 to 240VAC, 50/60Hz input, 3.8 to 48VDC output voltage and over 80 percent efficiency, with an operating temperature of 0 to 40 C. There are water-resistant versions having an up to IP55 rating.
These SMPS have built-in safety features against overload, -current, -temperature conditions and short circuits. They use MOSFETs and ICs sourced usually from STMicroelectronics, Onsemi, TI, NXP, Linear and Toshiba. Other manufacturers turn to homegrown providers such as HiSilicon, ZTE Microelectronics, Spreadtrum and the Tsinghua Unigroup. The rest of the components used are domestically made EMI filters, transformers and other passive components, PCBs and shells.
Most China-made SMPS comply with industry standards such as UL, CE, CCC, CB, FCC, IEC and RoHS.
SMPS, 12VDC, 10A or 24VDC, 5A output
Company: Shenzhen Kezhen Electronic Co. Ltd
Shenzhen Kezhen’s switching power supply, the DZ130ADL3603500, has 100 to 240VAC input voltage and 12VDC, 10A or 24VDC, 5A output. Its output power is 130W and the no-load power consumption is
MOQ: 500 units
Lead time: 25 days
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SMPS, ≥82 percent full-load efficiency
Company: Shenzhen Kezhen Electronic Co. Ltd
The EM1090XY-VVPP-1 switching power supply from Shenzhen Kezhen has 100 to 240VAC, 50/60Hz, maximum 3.15A input, 12 to 24VDC, 0 to 7.5A rated output, and 0.7W standby power at 240VAC. At full load, its efficiency is ≥82 percent. This unit, with 0 to 40 C operating temperature, has overcurrent and short-circuit protection. It conforms to UL, CE, CB, FCC and IEC standards.
MOQ: 500 units
Lead time: 25 days
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IP20-rated SMPS
Company: Shenzhen Leadpower Technology Co. Ltd
Shenzhen Leadpower’s B1E1S-H400-V012-G switching power supply has 176 to 264VAC input voltage, 12VDC and ≤±1 percent output voltage and tolerance, 33A rated output current, 400W maximum output power and ≤150mVp-p output ripple and noise. This CE-approved unit has an operating temperature of -30 to 70 C and is IP20-rated.
MOQ: Negotiable
Lead time: 7 days
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SMPS with 87 percent efficiency
Company: Shenzhen Leadpower Technology Co. Ltd
The B6E1T-H300-N switching power supply from Shenzhen Leadpower has an input voltage of 176 to 264VAC, output voltage of 5VDC, rated output current of 60A, maximum output power of 264W, efficiency of 87 percent and operating temperature of -30 to 70 C.
MOQ: Negotiable
Lead time: 7 days
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SMPS for IT equipment
Company: Shenzhen Topow Electronics Co. Ltd
From Shenzhen Topow, the TPT100S05A2-1 switching power supply for IT equipment has 90 to 264VAC, 47 to 63Hz input, 5V, 20A, 100W output, >85 percent efficiency and -10 to 40 C operating temperature. It has overcurrent and short-circuit protection.
MOQ: Negotiable
Lead time: 15 days
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SMPS for A/V equipment
Company: Shenzhen Topow Electronics Co. Ltd
For A/V equipment, Shenzhen Topow’s switching power supply, the POW3050A, has 90 to 264VAC, 47 to 63Hz input, 19V, 3.3A, 60W output, 85 percent efficiency and -5 to 40 C operating temperature. Its safety features cover overpower, -current, -voltage and short-circuit conditions.
MOQ: Negotiable
Lead time: 15 days
