Electrostatic discharges and transient signals monitoring system and method

• US 6,762,607 B2
• Filed: 05/12/2003
• Issued: 07/13/2004
• Est. Priority Date: 04/19/1999
• Status: Expired due to Term

• Current Assignee: Desco Industries Incorporated
• Original Assignee: Credence Technologies, Inc. (3M Company)
• Inventors: Kraz, Vladimir
• Primary Examiner(s): Zarneke, David A.
• Assistant Examiner(s): Nguyen, Trung Q.
• Application Number:
  US10/437,108
• Publication Number:
  US 20030201778A1
• Time in Patent Office: 428 Days
• Field of Search: 324/771, 324/419, 324/415, 324/168, 324/134
• US Class Current: 324/458
• CPC Class Codes: G01R 29/12 Measuring electrostatic fields or voltage-potential
• CPC Class Codes: G01R 31/1272 of cable, line or wire insulation, e.g. using partial discharge measurements locating faults in cables G01R31/083

Abstract

An ESD and transient signal monitoring system and method are provided wherein an ESD monitoring device may be used to continuously monitor ESD events and generate an indicating of the magnitude of the ESD events. A method for protecting an electronic device from ESD events is also described.

Claims

1. A power supply isolation apparatus, comprising:

first switching means that connect a first storage means to the output of a power source;

second switching means that connects said first storage means to a second storage means, the second storage means being connected to the electric load; and

a controller for controlling the first and second switching means where both the switching means connect the first storage means alternatively to either said power source or to said second storage means in a non-overlapping manner so that said first storage means charge from said power supply and discharge into said second storage means in a manner where said second storage means and said electric load are never directly connected to said power supply and no interference signal is passed from said power supply.

2. A power supply isolation apparatus, comprising:

a first switching means that connect a first storage means alternatively to either a power supply or to an electric load; and

a second switching means that alternatively connect a second storage means to either said power supply or to said electric load where said first switching means and said second switching means operate in a non-overlapping manner when one storage means is connected to said power supply for charging and another previously charged storage means provides power to said electrical load so that said electric load is never directly connected to said power supply and no interference signal is passed from said power supply.

3. The apparatus of claim 2 further comprising a third storage means connected in parallel to said electric load to sustain its voltage during switching transitions and to reduce transient signals generated by said switching transitions.

4. The device of claim 2 further comprising a voltage monitor connected across said electrical load with its output connected to a control circuit, the first output of said controlled means is controlling operation of said first switching means and the second output of said control means is controlling operation of said second switching means where said voltage monitor provides control signal to said control means when the voltage across said electric load drops to preset level and said control circuit in response initiates switching cycle and connects storage means that were providing voltage to said electric load to said power supply for charge and other previously charged storage means to said electric load for providing power.