MH/T 9009-2017Airborne power supply system for portable electronic device (English PDF)

5.1 General requirements

5.1.1 Environmental requirements

5.1.1.1 Working temperature

5.1.1.2 Working height

CU and PCM should be installed in the pressurized area. Carry out the working height test in accordance with 6.3.2, the maximum cabin height in normal operation should not be lower than 4 600 m (15 000 ft) MSL.

5.1.1.3 Temperature changes

Perform temperature change test in accordance with 6.3.3.After the test, CU and PCM should work normally.

5.1.1.4 Damp heat

Carry out damp heat test in accordance with 6.3.4.After the test, CU and PCM should work normally.

5.1.2 Insulation characteristics

5.1.2.1 Insulation resistance

Conduct insulation resistance test according to 6.4.1.The insulation resistance of CU and PCM should not be less than 1 Mohm.

Carry out the insulation resistance test according to 6.4.1, the insulation resistance of OU should not be less than 5 Mohm, and the insulation resistance between AC and DC in OU should not be small at 5 Mohm.

5.1.2.2 Insulation strength

Conduct the insulation strength test in accordance with 6.4.2.CU, PCM and OU shall not show arc or insulation breakdown.

5.1.3 Mechanical strength

5.1.3.1 Job shock

Carry out the working impact test in accordance with 6.5.1.After the test, CU and PCM should work normally.

5.1.3.2 Crash safety

Carry out crash safety test in accordance with 6.5.2.After the test, the shells of CU and PCM are allowed to bend and deform, and the installation connectors should not be damaged.

And the equipment should be able to work normally.

5.1.3.3 Vibration

Carry out vibration test according to 6.5.3, CU and PCM should be able to work normally.

5.1.4 Electromagnetic compatibility

5.1.4.1 Magnetic influence

For the CU and PCM pre-installed in the cockpit, when the deviation of the magnetic compass is equal to 1°, the distance between the CU or PCM and the magnetic compass should not be large at 0.3 m.

For the CU and PCM pre-installed in the passenger cabin, when the deviation of the magnetic compass is equal to 1°, the distance between the CU or PCM and the magnetic compass should be 1 m~3 m Within range.

5.1.4.2 Voltage spike

Carry out voltage spike test according to 6.6.2, CU and PCM should work normally.

5.1.4.3 Audio conduction sensitivity

Carry out audio frequency conduction sensitivity test according to 6.6.3, CU and PCM should be able to work normally.

5.1.4.4 Induction signal sensitivity

Carry out the induction signal sensitivity test according to 6.6.4, CU and PCM should be able to work normally.

5.1.4.5 RF sensitivity (radiation and conduction)

Carry out the radio frequency susceptibility (radiation and conduction) test according to 6.6.5, and the CU and PCM should work normally.

5.1.4.6 Radio frequency energy emission (radiation and conduction)

Carry out radio frequency energy emission (radiation and conduction) test according to 6.6.6, CU and PCM should be able to work normally.

5.1.4.7 Electrostatic discharge

Perform the electrostatic discharge test in accordance with 6.6.7, and the performance of CU and PCM should not cause permanent degradation.

5.1.5 Power input

According to 6.7.1, carry out the influence test of the power supply characteristics on the equipment, and the CU and PCM should be able to work normally.

According to 6.7.2, carry out the test of the influence of the equipment on the power supply. The CU and PCM shall comply with the provisions of 16.7 of RTCA DO-160G.

5.1.6 Software

Program writing and testing should comply with RTCA DO-178B regulations, and be able to achieve on-wing software upgrades.

5.1.7 Self-check function

CU and PCM should have power-on self-check and online cycle fault monitoring functions.

5.1.8 Protection function

5.1.8.1 Overload protection

All output channels of CU and PCM shall have separate overload protection functions. CU and PCM AC output current is greater than 150% of the rated current value when, the output power should be cut off.

5.1.8.2 Short circuit protection

All output channels of CU and PCM shall have separate short-circuit protection functions. CU and PCM AC output current is greater than.200% of the rated current value when it is time, the output power should be cut off by the hard protection device.

5.1.8.3 Overheating protection

When the temperature in the CU and PCM shell is greater than 85 °C, the output power should be cut off, and the CU and PCM should not be damaged. CU and PCM should adopt However, the cooling method dissipates heat.

5.1.8.4 Leakage protection

All output channels of CU and PCM should have separate leakage protection devices to monitor the leakage current between CU and PCM output power and ground in real time.

When the leakage current at the output of the CU is greater than the leakage protection current value set by the equipment, the leakage protection device should cut off the output power within 30 ms.

And the CU should not be damaged.

When the leakage current of the PCM output terminal is greater than 6 mA, the leakage protection device should cut off the output power within 20 ms, and the PCM should not be damaged.

5.1.9 Flame retardancy

When the PCM indicator cable protective wire net and the OU shell material burn vertically, after removing the fire source, they should self-extinguish within 15 s, and the burnt length should be not more than 203 mm (8 inch), the time for the burning drip to continue to flame after falling should not be more than 5 s.

When the PCM indicator cable and OU cable burn at 60°, after removing the fire source, they should self-extinguish within 30 s, and the burnt length should not be greater than 76 mm (3 inch), the time for the burning drip to continue to flame after falling should not exceed 3 s.

5.1.10 Reliability

According to GJB/Z 299C calculation, the mean time between failures of CU and PCM should not be less than 20 000 h.

5.2 CU technical requirements

5.2.1 Main on/off function

The CU shall have the function of manually turning on/off the output of all channels remotely.

5.2.2 Single channel on/off function

Each AC channel of CU shall have the function of independently turning on/off the channel output.

5.2.3 Shutdown interface

The CU shall have a logic interface that can be set to automatically reset the shutdown type and lock the shutdown type. Loss of pressure in the cabin, lowering of flaps and slats or other when it is necessary to disconnect the onboard power supply system of the PED, the CU should shut down all channel outputs.

5.2.4 Power Management

The CU shall have the function of cyclically detecting the output power of each channel. Under the following conditions, the CU shall send the corresponding working mode signal to the PCM.

--When the CU output power is less than the CU single channel limit power, the CU sends the "output available" work mode signal to the PCM;

--When the CU output power is greater than the CU single channel limit power, the CU sends the "output limit" work mode signal to the PCM;

--When the cabin is depressurized, flaps and slats are lowered, or other airborne power supply systems that need to disconnect the PED, the CU sends "output disable" to the PCM Working mode signal.

Note. CU single channel limited power refers to the rated power of CU single channel minus 150 VA.

5.2.5 Indication function

The CU should be equipped with indicator lights of specific colors or flashing at a certain frequency to achieve the following indicating functions.

--Indication of input power status;

--Each channel output power status indication. including "output normal" and "no output" status;

--Indication of self-check status. including "pass" and "fault" status;

--Each channel leakage protection status indication.

5.2.6 Communication function

The CU should have the function of communicating with the aircraft entertainment system.

5.3 PCM technical requirements

5.3.1 Power factor

PCM should have power factor correction function. When the input is rated voltage and output rated power, the input power factor should not be less than 0.968.

5.3.2 Efficiency

The PCM efficiency should not be less than 90%.

5.3.3 Output power limit

During normal operation, PCM should have the following output power limiting functions.

--Limit the total output power (including AC and DC) not to exceed 250 VA;

- When the output power is greater than 250 VA due to new equipment, restrict the use of new equipment;

--When the output power is greater than 250 VA due to the power change of the equipment in use, limit the use of the maximum power equipment;

--Limit the single-channel AC output power not to be greater than 150 VA, and automatically shut off the output when it exceeds 150 VA;

--Limit the single-channel DC output current to be no more than 2.2 A. When it exceeds 2.2 A, the output is automatically shut off.

When higher output power is required, the relevant airworthiness regulations should be met.

5.3.4 AC steady-state output characteristics

PCM should have the following AC steady-state output characteristics.

--The output voltage is 110 V±11 V or 220 V±22 V;

--The frequency is 60 Hz±3 Hz or 50 Hz±3 Hz.

5.3.5 Overvoltage protection

All AC output channels of PCM shall have separate overvoltage protection functions.

--PCM (the rated output voltage is 110 V/60 Hz) when the output voltage is greater than 121 V, the output power will be cut off within 1 s;

--PCM (the rated output voltage is 220 V/50 Hz) When the output voltage is greater than 242 V, the output power will be cut off within 1 s.

5.3.6 Undervoltage protection

All AC output channels of PCM shall have separate undervoltage protection functions.

--PCM (rated output voltage is 110 V/60 Hz) when the output voltage is less than 99 V, cut off the output power within 1 s;

--PCM (rated output voltage is 220 V/50 Hz) When the output voltage is less than 198 V, the output power will be cut off within 1 s.

5.3.7 Over-frequency protection

All AC output channels of PCM shall have separate over-frequency protection functions.

--PCM (rated output frequency is 60 Hz) when the output frequency is greater than 66 Hz, cut off the output power;

--PCM (rated output frequency is 50 Hz) When the output frequency is greater than 55 Hz, cut off the output power.

5.3.8 Under-frequency protection

All AC output channels of PCM shall have separate under-frequency protection functions.

--PCM (rated output frequency is 60 Hz) when the output frequency is less than 54 Hz, cut off the output power;

--PCM (rated output frequency is 50 Hz) When the output frequency is less than 45 Hz, cut off the output power.

5.3.9 AC output voltage waveform

The PCM AC output voltage waveform should be a sine wave. Under the condition of rated resistance load, the total harmonic distortion (THD) should be no more than 3% or distortion the coefficient of variation should not be greater than 0.04.

5.3.10 DC steady-state output characteristics

PCM should have the following DC steady-state output characteristics.

--The output voltage is 5 V±0.25 V;

--The ripple voltage is not more than.200 mV.

5.3.11 Load Balancing

The electrical connection in Figure 1 should be used between PCMs to ensure three-phase load balance. Carry out load balancing test according to 6.11.12, CU will it is intended that the output current difference between the two phases should not be greater than 0.2 A.

Figure 1 PCM electrical load balancing connection

5.3.12 Working Mode

After the PCM receives the three power management signals sent by the CU in 5.2.4, it should be in the following operating modes.

--"Output available" working mode. the output power of all AC output channels and DC output channels should meet the requirements of 5.3.3;

--"Output limit" working mode. maintain the output power of the current AC output channel and DC output channel, and limit the use of new equipment;

--"Output disabled" working mode. All AC output channels and DC output channels have no output.

5.3.13 Indication function

The PCM shall have the function of indicating the usage status to facilitate the observation of the unit. The green indicator light should be used to display the following working status of the PCM.

--No display. PCM is off or PCM is on and OU is not connected to PED device;

--Continuous light. PCM is turned on, and the PED device connected to OU is in working state;

--Using appropriate methods to display PCM power-on self-check and fault status.

5.4 OU technical requirements

5.4.1 General requirements

The rating of the OU AC output socket, grounding measures, aging resistance, protection and moisture resistance provided by the shell, breaking capacity, normal operation, the force, mechanical strength, heat resistance, creepage distance and electrical clearance required to pull out the plug, as well as the abnormal heat resistance of the insulating material, Flame resistance and tracking resistance should meet the requirements of GB 2099.1-2008.

The technical requirements of the OU DC output USB socket shall comply with the regulations of YD/T 1591.

5.4.2 Structure

OU includes AC output socket and DC output USB socket.

The configuration of the AC output socket should match the standard plug type in Figure 2.

5.4.3 Indication function

OU should be equipped with status indicator lights. When the indicator light is on, it is available, and when the indicator light is off, it is in a no-power state.

5.4.4 Protection against electric shock

The OU shall have protection against electric shock and shall comply with the provisions of Chapter 10 of GB 2099.1-2008.

The OU should have the following functions.

--When the two pins of the PED AC plug are balanced into the OU at the same time, the OU sends a signal to the PCM, and the PCM can output power;

--When a single pin of the PED AC plug is inserted into the OU, the PCM will not output power.

5.4.5 AC and DC isolation

Effective isolation should be set between the AC output and DC output of OU, between the center point of the three jacks of the AC interface and the center point of the USB interface the isolation distance should not be less than 30.0 mm. Insulating partitions should be installed inside the OU to isolate AC and DC.

6.1 Test environment

Except for the tests carried out in accordance with the cited national standards and RTCA DO-160G, other tests should be carried out in the following environment.

--Temperature. 15 °C~35 °C;

--Relative humidity. 0%~85%;

--Air pressure. 84 kPa~107 kPa.

6.2 Test equipment

The instruments and meters used in the test should be within the verification (or calibration) cycle, and their accuracy should meet the following requirements.

--Voltage measuring equipment should not be lower than class 0.5;

--The current measuring equipment should not be lower than class 0.5;

--The frequency measurement equipment should not be lower than 0.5 level;

--The power factor and power measuring equipment should not be lower than level 1;

--The power quality analysis equipment should be no less than 0.5 grade;

--The temperature measuring equipment should not be lower than ±1 °C;

--Except for special instructions, other measurement equipment not mentioned should be at least not lower than 1.5.

6.3 Environmental test

6.3.1 Working temperature test

Perform operating temperature tests on CU and PCM according to the A1 equipment test requirements specified in Chapter 4 of RTCA DO-160G.

6.3.2 Working height test

The working height test of CU and PCM is carried out according to the test requirements of A1 equipment specified in Chapter 4 of RTCA DO-160G.

6.3.3 Temperature change test

Perform temperature change tests on CU and PCM respectively in accordance with the requirements of Type B temperature change rate specified in Chapter 5 of RTCA DO-160G.

6.3.4 Damp heat test

According to the test requirements of Class A equipment specified in Chapter 6 of RTCA DO-160G, CU and PCM are respectively subjected to damp heat test.

6.4 Insulation characteristic test

6.4.1 Insulation resistance test

Conduct insulation resistance tests on CU and PCM respectively in accordance with the provisions of Chapter 18 of GB 5226.1-2008.

Conduct insulation resistance test on OU in accordance with the provisions of Chapter 17 of GB 2099.1-2008.

Short-circuit the OU AC interface power cord and short-circuit the DC interface power cord, and measure the insulation resistance between the two using insulation resistance testing equipment.

6.4.2 Dielectric strength test

In accordance with the provisions of Chapter 18 of GB 5226.1-2008, conduct insulation strength tests on CU and PCM respectively.

Conduct insulation strength test on OU in accordance with the provisions of Chapter 17 of GB 2099.1-2008.

Note. The test frequency of CU input, CU output and PCM input is 360 Hz~800 Hz, and the test frequency of PCM output is 50 Hz or 60 Hz.

6.5 Mechanical strength test

6.5.1 Working shock test

Perform operating shock tests on CU and PCM according to the test requirements for Class B equipment specified in Chapter 7 of RTCA DO-160G.

6.5.2 Crash safety test

Perform crash safety tests on CU and PCM according to the test requirements for Class B equipment specified in Chapter 7 of RTCA DO-160G.

6.5.3 Vibration test

Perform vibration tests on the CU and PCM installed in area 1 according to the R test procedures specified in Chapter 8 of RTCA DO-160G.

6.6 Electromagnetic compatibility test

6.6.1 Magnetic influence test

The CU and PCM pre-installed in the cockpit of the aircraft are respectively magnetically magnetized in accordance with the test requirements of category Z equipment specified in RTCA DO-160G Chapter 15 Impact test.

Perform magnetic imaging of the CU and PCM pre-installed in the aircraft cabin in accordance with the test requirements of category B equipment specified in RTCA DO-160G Chapter 15 Ring test.

6.6.2 Voltage spike test

Perform voltage spike tests on CU and PCM respectively according to the test requirements for Class B equipment specified in Chapter 17 of RTCA DO-160G.

6.6.3 Audio frequency conduction sensitivity test

According to the R(CF), R(NF) and R(WF) equipment test requirements specified in Chapter 18 of RTCA DO-160G, conduct audio conduction sensitivity on CU and PCM respectively.

Perceptual test.

6.6.4 Induction signal sensitivity test

According to the AC, AN and AW equipment test requirements specified in Chapter 19 of RTCA DO-160G, the CU and PCM are respectively subjected to induction signal sensitivity test.

6.6.5 Radio frequency susceptibility (radiation and conduction) test

Perform radio frequency suscep...