Focus on solving DC power solutions

one. Withstand voltage

(HI.POT, ELECTRIC STRENGTH, DIELECTRIC VOLTAGE WITHSTAND) KV

1.1 Definition: Between the designated terminals, such as: I/P-O/P, I/P-FG, O/P-FG, the effective value of AC resistance, the leakage current is generally tolerable 10 mA, and the time is 1 minute.

1.2 Test conditions: Ta: 25 degrees Celsius; RH: indoor humidity.

1.3 Test circuit:

1.4 Description:

1.4.1 The withstand voltage test is mainly to prevent electrical damage. The high voltage connected through the input will affect the safety of users.

1.4.2 During the test, the voltage must be increased from 0V and adjusted to the highest point within 1 minute.

1.4.2 When discharging, you must pay attention to the Timer setting of the tester, and adjust the voltage back to 0V before OFF.

1.4.3 During the safety certification test, the transformer needs to be tested separately, indoor, the temperature is 25 degrees Celsius, RH: 95 degrees Celsius, 48HR, and the transformer primary/secondary and primary/CORE are tested afterwards.

1.4.5 The test time of the production line is 1 second.

two. Ripple noise (ripple noise voltage)

(Ripple & Noise)%, mv

2.1 Definition:

The maximum value (P-P) or effective value of the AC voltage component superimposed on the DC output voltage.

2.2 Test conditions:

I/P: Nominal

O/P: Full Load

Ta: 25℃

2.3 Test circuit:

2.4 Test waveform:

2.5 Description:

2.5.1 The GND wire of the oscilloscope should be as short as possible, and the test wire should be far away from the PUS.

2.5.2 Use 1:1 Probe.

2.5.3 The BW of the Scope is generally set at 20MHz, but for the current network product testing ripple noise, it is best to set the BW to the maximum.

2.5.4 The environment between Noise and the instrument used is very different, so the test must indicate the test location.

2.5.5 Test the ripple noise so that it does not exceed the original specification value +1% Vo.

three. Leakage current (leakage current)

（Leakage Current）mA

3.1 Definition:

Enter the current flowing between a casing (when the casing must be grounded).

3.2 Test conditions:

I/P: Vin max.×1.06(TUV)/60Hz

Vin max.(UL1012)/60Hz

O/P: No Load/Full Load

Ta: 25 ℃

3.3 Test circuit:

3.4 Description:

3.4.1 Both L and N need to be tested.

3.4.2 UL1012 R value is 1K5.

TUV R value is 2K/0.15uF.

3.4.3 Leakage current specification TUV: 3.5mA, UL1012: 5mA.

Four. Temperature test

(Temperature Test)

4.1 Definition:

Temperature test means that the temperature of the parts or case of the PSU should not exceed its material specifications under normal operation.

Grid or specification fixed value.

4.2 Test conditions:

I/P: Nominal

O/P: Full Load

Ta: 25℃

4.3 Test method:

4.3.1 Fix the Thermo Coupler (TYPE K) firmly on the object to be measured

(Quick-drying, Tape or welding method).

4.3.2 The Thermo Coupler was twisted three times at the end and then welded into a ball for testing.

4.3.3 We generally use a point thermometer to measure.

4.4 Test parts:

Heat source and parts susceptible to heat source

For example: input terminal, Fuse, input capacitor, input inductance, filter capacitor, bridge adjustment, thermal

sensitive, surge absorber, output capacitor, output capacitor, output inductance, transformer, iron core,

P.C.B....... under winding, heat sink, high-power semiconductor, Case, heat source parts.

4.5 Part temperature limit:

4.5.1 If there are marked temperatures on the parts, the marked temperature shall be used as the reference.

4.5.2 For other parts that are not marked with temperature, the temperature shall not exceed the temperature resistance of P.C.B.

4.5.3 Inductance shows individual application for safety regulations, the temperature rise limit is 65℃Max (UL1012), 75℃

Max(TUV).

five. Input voltage regulation rate

(Line Regulation),%

5.1 Definition:

The rate of change of the output voltage when the input voltage changes within the rated range.

Vmax-Vnor

Line Regulation(+)=------------------

Vnor

Vnor-Vmin

Line Regulation(-)=------------------

Vnor

Vmax-Vmin

Line Regulation=----------------

Vnor

Vnor: The input voltage is the normal value, and the output is the output voltage at full load.

Vmax: The highest output voltage when the input voltage changes.

Vmin: The lowest output voltage when the input voltage changes.

5.2 Test conditions:

I/P: Min./Nominal/Max

O/P:Full Load

Ta:25℃

5.3 Test circuit:

5.4 Description:

Line Regulation can also directly Vmax-Vnor and Vmin-Vnor ± maximum

The value of 　　 is expressed in mV, and is expressed in conjunction with Tolerance%.

six. Load regulation rate

(Load Regulation)%

5.1 Definition:

The rate of change of the output voltage when the output current changes within the rated range (static).

|Vminl-Vcent|

Line Regulation(+)=------------------×100%

Vcent

|Vcent-VfL|

Line Regulation(-)=------------------×100%

Vcent

|VminL-VfL|

Line Regulation(%)=----------------×100%

Vcent

VmilL: Output voltage at minimum load

VfL: Output voltage at full load

Vcent: Output voltage at half load

6.2 Test conditions:

I/P: Nominal

O/P:Min./Half/Full Load

Ta:25℃

6.3 Test circuit:

6.4 Load Regulation can also directly Vmin.L-Vcent and Vcent-Vmax. ±max

The value of 　　 is expressed in mV, and is expressed in conjunction with Tolerance%.