Yiguang Technology

Shenzhen Yiguang Technology Co., Ltd. is certified as a qualified factory by TUV SUD Product Service GmbH Germany.

Factory Inspection Report based on CIG 023:2014

YG, Co. is a LED driver manufacturer identified by PSE

YG, Co. is a LED driver manufacturer identified by CQC, ID: V012330

While selecting LED driver, sometimes may find that LED driver constant current output less than specified value and then gradually reach it after LED lamps emit heat. The reason is the number of LED lamp in series is lager than specified value. Each LED lamp forward Vf typical value is usually 3.2V while working, and 3.6V when in low temperature. Hence customer should use 3.6V if LED lamps work in Low temperature area.

Monopole PFC LED driver may strikes sparks at poor connection, this leads to high frequencey power onoff status and damages LED driver finally.

Common damage type:

1.blowout

2.rectifier bridge short circuit owing to high frequencey power onoff heating

3.MOSFET overheating owing to high frequencey power onoff This kind of products is unsuited working in high frequencey power onoff status, therefore input AC wire should be well connected to ensure LED driver working in right status.

Power factor PF is highly related to actual power, usually ,it is index of rated input power and should not drift from rated power obviously. Power factor PF concerns not only input power but also input voltage.

Follwing relationship is always established:

1.The lower the input voltage, the higher the PF value, vice versa.

2.The smaller the input power, the lower the PF value, vice versa.

3.Power factor is high when ohmic load and low when LED lamp load. Generally, it’s recommended to use 80% above actual power of selected LED driver, PF value can meet Energy Star standard.

It is usually happened that result unstable when LED driver is tested with electronic load. Using appropriate electronic load and adjusting it at suitable operation mode are both important.

To monopole PFC LED driver, as LED driver output ripple is greater than standard AC/DC, it is DC+AC ripple output type, therefore common electronic load will detect the result as AC type incorrectly.

The working status of electronic load should be set in CR mode, not CC or CV mode, this is determined by LED driver feature.

For LED driver is constant current, using CC mode will result in conflict between Led driver constant current and load constant current, this cause LED driver working instability and test failure.

It is suggested to use CR mode of CHROMA 8000 system, also either resistance load or LED lamp can be used in test.