1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2007 SAE International All rights reserved. No part of this publication m
3、ay be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA)
4、 Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org AS4805 AEROSPACE STANDARD Issued 2007-07 Solid State Power Controller, General Standard For RATIONALE This document was created to fill the need for a solid state power controller (SSPC) standard in the aerospace ind
5、ustry. SSPC use has become common practice within the industry. Presently there are no known guiding documents addressing these requirements. The document will define the minimum electrical, environmental, and reliability requirements for these devices in aerospace applications. 1. SCOPE 1.1 Scope T
6、his SAE Aerospace Standard (AS) covers the general requirements for the design, manufacture, and test of Solid State Power Controllers (SSPCs) of both dc and ac ratings for use in electrical power systems. SSPCs conforming to this standard are intended for use in controlling the making and breaking
7、of power circuits for electrically operated equipment and devices, and for providing overload and short-circuit protection. 1.2 Field of Application The principal areas of application of SSPCs are in electrical power distribution systems of aircraft, missiles, ground vehicles, spacecraft, and ground
8、 support equipment. This does not preclude the use of SSPCs in other applications. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable isue of other publication
9、s shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exempt
10、ion has been obtained. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AS1212 Electric Power, Aircraft, Characteristics and Utilization of AS1831 Electric
11、al Power, 270 V DC, Aircraft, Characteristics and Utilization of AS9000 Aerospace Basic Quality System Standard AMS 2422 Plating, Gold SAE AS4805 - 2 - 2.1.2 ANSI Publications Available from American National Standards Institute, 25 West 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.a
12、nsi.org. ANSI Z540-1 General Requirements for Calibration Laboratories and Measuring and Test Equipment 2.1.3 ASME Publications Available from American Society of Mechanical Engineers, 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900, Tel: 973-882-1170, www.asme.org. ASME B1.13M-2001 Metric Scr
13、ew Threads - M Profile 2.1.4 ISO Publications Available from American National Standards Institute, 25 West 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org. ISO-9000 Quality Management Systems - Fundamentals and Vocabulary ISO-10012-1 Quality Assurance Requirements for Measurin
14、g Equipment; Part 1: Meteorological Confirmation System for Measuring Equipment ISO-68-1:1998 ISO General Purpose Screw Threads - Basic Profile - Part 1: Metric Screw Threads 2.1.5 RTCA Publications Available from Radio Technical Commission for Aeronautics Inc., 1828 L Street, NW, Suite 805, Washing
15、ton, DC 20036, Tel: 202-833-9339, www.rtca.org. RTCA/DO-160 Environmental Conditions and Test Procedures for Airborne Equipment 2.1.6 U.S. Government Publications Available from the Document Automation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel:
16、 215-697-6257, http:/assist.daps.dla.mil/quicksearch/. MIL-STD-129 Standard Practice for Military Marking MIL-STD-130 Identification Marking of U.S. Military Property MIL-STD-202 Test Method Standard for Electronic and Electrical Component Parts MIL-HDBK-217 Reliability Prediction of Electronic Equi
17、pment MIL-HDBK-454 General Guidelines for Electronic Equipment MIL-STD-461 Requirements for Control of Electromagnetic Interference Characteristics of Subsystems and Equipment MIL-STD-704 Aircraft Electric Power Characteristics MIL-STD-810 Environmental Engineering Considerations and Laboratory Test
18、s SAE AS4805 - 3 - MIL-STD-883 Test Method Standard Microcircuits MIL-HDBK-965 Acquisition Practices for Parts Management MIL-STD-1686 Electrostatic Discharge Control Program for Protection of Electrical and Electronic Parts, Assemblies and Equipment (Excluding Electrically Initiated Explosive Devic
19、es) (Metric) MIL-STD-1916 DoD Preferred Methods for Acceptance of Product MIL-PRF-19500 Semiconductor Devices, General Specification for MIL-PRF-38534 Hybrid Microcircuits, General Specification for MIL-T-81714 Terminal Junction System (TJS), Environment Resistant, General Specification For FED-STD-
20、H28 Screw Thread Standards for Federal Services 2.2 Definitions and Terminology The definitions listed below are not a complete glossary of SSPC terminology, but rather are intended as definitions of the technical terms as applied within this document. APPLICATION TIME TO RESET: The time interval th
21、e reset signal must be applied to cause reset. COORDINATION: Refers to the instance where a given overload must trip the lowest rated SSPC in a cascaded system to prevent turn off of other loads that are not involved or affected by the fault. CURRENT LIMITING: A protective characteristic of an SSPC
22、which limits the output current to a specified value. This limit thus defines the maximum value of overload current prior to tripping. FAIL SAFE (DUAL SAFETY): A second element used to interrupt an overload current in the event of a failure in the SSPCs primary switch. FALL TIME: See Figure 3(A). LO
23、AD VOLTAGE: The voltage between the power output terminal of the SSPC and the power ground. INSTANTANEOUS TRIP: An immediate trip function that protects the solid state switch from turning on into a short circuit (1000% rated load). NON-REPETITIVE RESET: The minimum specified time interval between t
24、ripout and reset for which the trip characteristics are valid. OFF STATE: That condition under which the device prevents power from being passed to the load. ON STATE: That condition under which, with the turn-on signal applied, the device allows power to be passed to the load. PEAK LET THROUGH CURR
25、ENT: The maximum value of current available to the load through the device during the first 100 microseconds after application of the overload or fault condition (see Figure 4). POWER CONTROLLER: A switching and protection device providing an output power switch which presents a low impedance betwee
26、n its supply and load terminals when in the ON state and a high impedance in the OFF state. The state of the power switch normally conforms to that represented by a signal externally applied to the controller. The state of the power switch is represented by an indication signal. The controller trips
27、 to isolate the load circuit from the supply on detection of an electrical overload or momentarily limits the current to a specified value. SAE AS4805 - 4 - POWER DISSIPATION: All power dissipated in the power switching circuit and power losses due to internal leakage currents, power supplies, contr
28、ol input, status, and reset signals. RATED CURRENT: The intended maximum current an SSPC is capable of carrying for an indefinite amount of time without tripping. REPETITIVE RESET: The time period after a trip condition and subsequent overload in which the SSPC reduces the trip time relationship bas
29、ed on thermal memory. RESET: The restoration of the tripped SSPC to a state from which it can be turned ON. RISE TIME: See Figure 3(A). SHORT CIRCUIT: A short circuit is defined as an impedance of less than 1 m applied between the output terminal and ground. SUPPLY VOLTAGE: The voltage applied betwe
30、en the power input terminal of the SSPC and the power ground. THERMAL MEMORY: The ability of an SSPC to take into account the thermal energy retained in a wire or device. TRIP: The automatic interruption of current that results from electrical overloads. TRIP CURVE CHARACTERISTICS: The trip curve se
31、ts the minimum and maximum trip points of the SSPC and is plotted as current verses time, typically an inverse I2t relationship. TRIP FREE: A characteristic which will not allow a device to be maintained ON with a continued application of an input signal when carrying an overload current that would
32、normally cause the device to trip. TRIP TIME: The time lapse between the application of an overload or fault and the 10% value of rated output current. TURN-OFF SIGNAL: The control signal level at which the SSPC is turned OFF. TURN-OFF TIME: See Figure 3. TURN-ON SIGNAL: The control signal level at
33、which the SSPC is turned ON. TURN-ON TIME: See Figure 3. ZERO VOLTAGE TURN-ON (ZVTO) AND ZERO CURRENT TURN-OFF (ZCTO): A characteristic that requires the SSPC to turn ON and turn OFF only at the half-cycle crossing point when connected to a resistive load, regardless of when the control signal is ap
34、plied or removed (ac SSPCs only). SAE AS4805 - 5 - 2.3 SSPC Interface List and Definitions The following provides a listing, along with definitions, of the primary and secondary interfaces for the device. The primary interfaces are the minimum required for all devices procured under this specificati
35、on. The secondary interfaces are the optional inputs and outputs available to the user. The secondary interfaces required must be specified in the detail specification sheets. The associated interface definitions are provided to minimize any misunderstanding that might occur between the user and sup
36、plier as to the function of the interface specified. a. PRIMARY INPUTS: The primary inputs are the minimum required for device procurement under this specification. 1. ON/OFF CONTROL: A discrete two-level signal that commands the device output ON or OFF. Application of the ON command will cause the
37、device output to close, allowing power to flow from the source to the load. Application of the OFF command will cause the device output to open removing power from the load. 2. POWER INPUT: The power received from the source, to be controlled by the device for connection to the utilization equipment
38、. b. SECONDARY INPUTS: The secondary inputs are additional capabilities available to the user, the characteristics of which must be defined in the detail specification sheet. 1. ADDRESS: A digital signal that provides a logical or physical address to the device for incorporation in the device memory
39、. 2. BIT INITIATE: A signal which commands a self test of the device as defined in the detail specification sheet. This test must not affect the device output switch condition. 3. CONFIGURABILITY: The ability to physically set the device characteristics by use of an external resistor, jumper leads,
40、or other external fixed connections. 4. CONFIGURATION DATA: An analog or digital signal requesting a reading of device parameters such as rating, part number, modification status, address/installation position, trip level/time setting, and limit level/time as defined in the detail specification shee
41、t. For devices with programmable characteristics. 5. ENABLE BIAS: A discrete two-level voltage signal that when true, allows the device to change state based on the ON/OFF control signal. 6. PROGRAMMABLE CHARACTERISTICS: Inputs that allow changes in the devices default settings, as defined in the de
42、tail specification sheet. These inputs can revise the devices operating characteristics such as the time-current trip relationship and steady-state current rating. 7. RESET: An edge sensitive signal that, when applied, closes the device output reconnecting power to the load and restoring the device
43、to its original, no-fault condition. (The ON/OFF control signal can also be used for reset purposes in conjunction with or in lieu of the RESET signal.) 8. SERIAL ENABLE: A signal that enables serial output information, as defined in the detail specification sheet, to be sent. 9. TRIP INHIBIT: A dis
44、crete two-level signal that inhibits the normal device trip characteristics. When applied in a true (high) state, it overrides some or all of the devices internal preprogrammed trip characteristics as defined in the detail specification sheet. SAE AS4805 - 6 - c. PRIMARY OUTPUTS: The primary outputs
45、 are the minimum required for device procurement under this specification. 1. POWER OUTPUT: The power received from the source and provided by the device to the utilization equipment when all specified control and protection parameters have been satisfied. 2. STATUS OUTPUT: A discrete signal that pr
46、ovides state indication (on/off) of the output power switch of the device. d. SECONDARY OUTPUTS: The secondary outputs are additional capabilities available to the user, the characteristics of which must be defined in the detail specification sheet. 1. BUILT-IN TEST (BIT): An analog or digital signa
47、l that indicates an internal device fault has occurred. This signal should be provided either in response to a BIT initiate request or upon a known failure occurrence during normal operation without benefit of a BIT initiate request as defined in the detail specification sheet. 2. CONFIGURATION DATA
48、: A digital signal in response to a configuration data request that provides a reading of device parameters such as rating, part number, modification status, address/installation position, trip level/time setting, and limit level/time as defined in the detail specification sheet. (For devices with p
49、rogrammable characteristics.) 3. CURRENT LEVEL: An analog or digital signal indicating either that the current has exceeded a predefined level or a discrete range of current levels as defined in the detail specification sheet. 4. INTEND TO TRIP: An analog or digital signal indicating either that the device intends to trip allowing the system or user to take corrective action prior to power being disconnected from the load or that the
