Circuit design of 3W low cost and high efficiency constant voltage / constant current charger

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

Heng Jiaxing AO3401

Summary:

The LinkSwitch-LP flyback power supply converts AC input voltages from 90 VAC to 265 VAC into a single isolated DC output voltage. The power supply output is 2V, 1.5A (3W) and has constant voltage/constant current (CV/CC) characteristics. Typical applications include those that use a single rechargeable battery for an electric hair clipper and a repairer.

design feature

• High efficiency (>60% under full load)
• Low cost, low component count, compact and lightweight, alternative to linear power supply design
• No optocoupler required
• No constant current detection resistor required
• Extremely energy efficient
• Meets CEC/Energy Star 2008 requirements for working mode efficiency (requires 59%, up to 64%)
• Low input power at no load (less than 300mW at 230 VAC AC input, 500mW required)
• Excellent constant voltage/constant current characteristics at different temperatures
• Compliant with CISPR-22/EN55022 B conducted EMI limit, margin exceeds 8dBμV

Circuit diagram of 2V, 1.5A constant voltage constant current charger

See the uploading documentation for details (click to download)