Battery tester with load temperature detection

• US 5,700,089 A
• Filed: 05/08/1996
• Issued: 12/23/1997
• Est. Priority Date: 05/08/1996
• Status: Expired due to Fees

• Current Assignee: Ferret Instruments Incorporated
• Original Assignee: Ferret Instruments Incorporated
• Inventors: McKinnon, Donald C.
• Primary Examiner(s): BENNETT, GEORGE B
• Application Number:
  US08/646,943
• Time in Patent Office: 594 Days
• Field of Search: 374/45, 374/120, 374/121, 374/141, 374/142, 320/35, 324/431, 340/584
• US Class Current: 374/142
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC

Abstract

In an electrical resistive-load battery testing system, apparatus and methods disclosed for independently monitoring and reacting to both the temperature of the load and the power actually consumed by the load. The signals derived by the temperature and power monitoring aspects of the invention may be used for any useful purpose including visual and/or audible indicators to alert an operator that the system has exceeded predetermined operating levels. The load may be of a carbon-pile construction, though other loading arrangements are possible. The load-temperature monitoring aspect to the invention includes an optical sensor supported to receive thermal radiation from the load, and output an electrical signal representative of the level of radiation emitted by the load. Means connected to receive the electrical signal from the optical sensor are further provided to perform an operational function if the level of radiation emitted by the load exceeds a predetermined value. According to the direct load-power monitoring aspect of the invention, means are provided for sensing both the voltage applied across the load during the test and the current through the load during the test. Electrical circuity is then used to generate a signal representative of the power consumed by the load as a function of the voltage applied across the load and the current through by the load during the test, and a function such as an operator alert is performed in response to the power consumed by the load.

Claims

1. A battery load temperature monitoring system, comprising:

a resistive load;

means for coupling a battery to the load to perform a test on the battery;

an optical sensor supported to receive thermal radiation from the resistive load and output an electrical signal representative of the level of radiation emitted by the load; and

means connected to receive the electrical signal from the optical sensor and perform an operational function if the level of radiation emitted by the load exceeds a predetermined value.

2. The battery analysis system of claim 1 wherein the resistive load is a carbon-pile load.

3. The battery analysis system of claim 1 wherein the function performed is to alert a user.

4. A battery testing system with an over-temperature indicator, comprising:

a carbon-pile load;

a pair of battery cables connected to electrically opposing sides of the load, each cable having a free end adapted for attachment to the terminals of a battery to place it across the load to perform a test;

an infrared sensor mounted proximate to the carbon-pile load and positioned to receive energy radiated by the load as the test is performed, the sensor outputting an electrical signal representative of the radiation received; and

indicator means responsive to the electrical signal output by the infrared sensor.

5. The battery testing system of claim 4, wherein the indicator means generates a visual indication.

6. The battery testing system of claim 4, wherein the indicator means generates an audible indication.

7. In a battery testing system of the type wherein the battery is placed across a resistive load to perform a test on the battery, the improvement comprising:

sensing means configured to receive thermal radiation emitted by the load during the test performed on tile battery and output an electrical signal representative of load temperature; and

circuitry connected to receive the electrical signal and provide an indication associated with load temperature.