Universal power simulator

• US 6,304,839 B1
• Filed: 10/14/1998
• Issued: 10/16/2001
• Est. Priority Date: 10/14/1998
• Status: Expired due to Fees

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Ho, Alpha Ngai Chung, Chan, Whyemun
• Primary Examiner(s): Teska, Kevin J.
• Assistant Examiner(s): PHAN, THAI Q
• Application Number:
  US09/172,968
• Time in Patent Office: 1,098 Days
• Field of Search: 703/18, 703/20, 703/21, 703/28, 714/39, 714/40, 714/43, 714/44
• US Class Current: 703/18
• CPC Class Codes: G01R 31/31721 Power aspects, e.g. power supplies for test circuits, power saving during test for scan test G01R31/318575
• CPC Class Codes: G06F 11/24 Marginal checking or other specified testing methods not covered by G06F11/26, e.g. race tests

Abstract

A test system for functionally testing disk drives over a wide range of power conditions. The system simulates the power conditions using a computer controlled system architecture featuring several major components. The first of these components is a computer enhanced with features allowing the computer to communicate with disk drives having either IDE or Small Computer System Interface (SCSI) formats. The computer communicates with a second component termed the programmable power supply (PPS) and a third component having simulation circuitry termed universal power simulator, or UPS. The computer uses a combination of hardware and software to create simulated power conditions which are used to test the disk drives for correct operation and to glean out defective drives. The UPS is responsive to control signals from the host computer and the PPS and sends simulated power signals to the disk drives under test. The UPS includes a variety of subunits in the form of switching circuitry which are responsive to specific power testing conditions to evaluate disk drive performance. Examples of such subunits are a relay decoding and controlling subunit, a power switching subunit, an interface switching subunit, a power ramp subunit, and a spike generating subunit. The test system provides an efficient, compact, programmable, and interactive method of testing disk drives for resilience to anomalous power conditions.

Claims

1. A method for testing computer disk drives for power supply related failures, said method comprising the steps of:

(a) providing a test system, said test system comprising;

a host computer means for controlling said testing system and for recording resulting test data, said host computer means having an arbitrary waveform generation card, an analog to digital convertor card, and a general purpose interface bus;

a programmable power supply means for supplying power supply voltages to said test system; and

a universal power simulator means for simulating anomalous power conditions to said computer disk drive unit,

wherein, said universal power simulator means comprises a relay decoding/controlling circuitry, a power switching circuitry, power ramping circuitry, voltage spike generating circuitry and disk drive computer interface adaptor circuitry;

(b) providing a disk drive unit for testing; and

(c) simulating anomalous power conditions comprising a power-on test sequence, a hot plugging condition, a power ramp condition, and a voltage spike condition, said simulating comprising manipulation of said universal power simulator means;

(d) recording performance results.

2. A method for testing computer disk drives as described in claim 1, wherein:

said step (c) comprises the step of simulating a power ramp condition generated in response to a command from said arbitrary waveform generation card for generating a test waveform having a predetermined linear risetime and amplitude.

3. A method for testing computer disk drives as described in claim 1, wherein:

said step (c) comprising the step of simulating a voltage spike generated in response to a software command for generating a voltage spike having a predetermined voltage amplitude, and energy.