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Shenzhen-Branch tell you switch power test methods

Issuing time:2015-07-16
SHENZHEN Branch Power Technology Co., Ltd.-Shenzhen-Branch tell you switch power test methods

One. Withstand voltage

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

 1.1 Definitions: at designated terminals, for example: between I / PO / P, I / P-FG, O / P-FG, can withstand rms ac, the leakage current is generally permissible 10 mA, 1 minute.

 1.2 Test conditions: Ta: 25 ° C; RH: indoor humidity.

 1.3 Test circuit:

 1.4 Description:

 1.4.1 Pressure test is mainly to prevent electrical damage, via the input string into the high pressure, the impact of user safety.

 1.4.2 The test voltage must be raised by the beginning 0V, and raised to the highest point within one minute.

 The tester must pay attention to the Timer setting 1.4.2 discharge voltage repatriated before OFF 0V.

 1.4.3 safety certification test, transformer plus an additional measure, the indoor temperature of 25 degrees Celsius, RH: 95 degrees Celsius, 48HR, beginning after the test transformer / secondary and primary / CORE.

 1.4.5 production line testing time is 1 second.

 II. Ripple noise (ripple noise voltage)

 (Ripple & Noise)%, mv

 2.1 Definitions:

 Overlaps on the DC output voltage of the AC voltage component maximum (PP) or RMS.

 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 oscilloscope's GND lines as short as possible, get away from the test line PUS.

 2.5.2 1: Probe 1's.

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

 2.5.4 Noise and instrumentation, environment very different, so the test must show that the test sites.

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

 Three. Leakage current (leakage current)

 (Leakage Current) mA

 3.1 Definitions:

 Current input between the circulation of a housing (housing must be grounded when).

 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 L, N need to be measured.

 3.4.2UL1012 R value of 1K5.

 TUV R value 2K / 0.15uF.

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

 IV. Temperature Test

 (Temperature Test)

 4.1 Definitions:

 PSU temperature test refers to the normal working under its parts or materials shall not exceed the Case temperature regulation

 Grid or specification value.

 4.2 Test conditions:

 I / P: Nominal

 O / P: Full Load

 Ta: 25 ℃

 4.3 Test method:

 4.3.1 Thermo Coupler (TYPE K) firmly fixed to the measurement of the object

 (Quick-drying, Tape or welding).

 4.3.2 Thermo Coupler to three times after the end of the twisted welded into a ball test.

 4.3.3 We generally use point temperature meter.

 4.4 Test Parts:

 Susceptible to heat and heat affect some

 For example: an input terminal, Fuse, input capacitance, inductance input filter capacitor, the whole bridge, hot

 Min, surge absorber, the output capacitor, the output capacitor, the output inductors, transformers, core,

 Winding, PCB heat sink, power semiconductor, Case, heat parts under .......

 4.5 parts Temperature limits:

 There are marked temperature 4.5.1 parts to indicate the temperature of the reference.

 4.5.2 Other temperature of the parts are not marked, the temperature does not exceed the PCB temperature.

 4.5.3 inductance safety of individual applications are displayed, the temperature rise limit 65 ℃ Max (UL1012), 75 ℃

 Max (TUV).

 Fives. Line Regulation

 (Line Regulation),%

 5.1 Definitions:

 When the input voltage changes within the rated range, the output voltage change rate.

 Vmax-Vnor

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

 Vnor

 Vnor-Vmin

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

 Vnor

 Vmax-Vmin

 Line Regulation = ----------------

 Vnor

 Vnor: input voltage is normal, the output of the output voltage at full load.

 Vmax: maximum output voltage when the input voltage changes.

 Vmin: minimum 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 or directly Vmax-Vnor and Vmin-Vnor of ± Maximum

 Value expressed in mV, together with Tolerance% representation.

 VI. Load Regulation

 (Load Regulation)%

 5.1 Definitions:

 Output current change (static) within the nominal range, the output voltage change rate.

 | Vminl-Vcent |

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

 Vcent

 | Vcent-VfL |

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

 Vcent

 | VminL-VfL |

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

 Vcent

 VmilL: minimum load when the output voltage

 VfL: the output voltage at full load

 Vcent: half load when the output voltage

 6.2 Test conditions:

 I / P: Nominal

 O / P: Min / Half / Full Load.

 Ta: 25 ℃

 6.3 Test circuit:

 6.4Load Regulation or directly Vmin.L-Vcent and Vcent-Vmax. The maximum ±

 Value expressed in mV, together with Tolerance% representation.


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