Hybrid power relay using communications link

• US 8,422,178 B2
• Filed: 05/02/2011
• Issued: 04/16/2013
• Est. Priority Date: 04/06/2007
• Status: Active Grant

• Current Assignee: Watlow Electric Manufacturing Company
• Original Assignee: Watlow Electric Manufacturing Company
• Inventors: Pfingsten, Thomas Robert, Breitlow, Stanton Hopkins, Lemke, John Frederic, Ness, Keith Douglas
• Primary Examiner(s): PATEL, DHARTI HARIDAS
• Application Number:
  US13/098,836
• Publication Number:
  US 20110205682A1
• Time in Patent Office: 715 Days
• Field of Search: 361/2, 361/3, 361/7
• US Class Current: 361/2
• CPC Class Codes: H01H 2009/545 comprising a parallel semiconductor switch being fired optically, e.g. using a photocoupler,
• CPC Class Codes: H01H 47/007 with galvanic isolation between controlling and controlled circuit, e.g. transformer relay
• CPC Class Codes: H01H 47/32 Energising current supplied by semiconductor device
• CPC Class Codes: H01H 50/021 structurally combining a relay and an electronic component, e.g. varistor, RC circuit auxiliary switch inserting resistor during closure H01H50/543
• CPC Class Codes: H01H 9/542 Contacts shunted by static switch means

Abstract

A control circuit for controlling an arc suppression circuit includes a serial communication link communicating a serial signal therethrough. The control circuit includes a microprocessor having a serial input communicating with the serial communication link. The microprocessor generates a control output signal in response to the serial signal. The control circuit further includes the arc suppression circuit having an electrical contact and operating in response to the control output signal to reduce an arc at the electrical contact.

Claims

1. A control circuit comprising:

a serial communication link communicating a serial signal therethrough;

a microprocessor having a serial input communicating with the serial communication link and generating a control output signal in response to the serial signal; and

an arc suppression circuit having an electrical contact and operating in response to the control output signal to reduce an arc at the electrical contact, the microprocessor receiving arc suppression circuit parameters through the serial communication link including at least one of a duty cycle parameter, a pulse width parameter or a conduction time parameter.

3. A control circuit as recited in claim 1 wherein the serial communication link is coupled to an interface, the interface is disposed within the microprocessor.

4. A control circuit as recited in claim 1 wherein the serial signal comprises a serial digital information signal, the serial digital information signal comprising a state signal corresponding to a desired state of the arc suppression circuit.

5. A control circuit as recited in claim 1 wherein the serial signal comprises a serial digital information signal, the serial digital information signal comprises an algorithm selecting signal.

6. A control circuit as recited in claim 1 wherein the control output signal comprises a first output signal and a second output signal.

7. A control circuit as recited in claim 6 wherein the first output signal controls a mechanical relay control portion of the arc suppression circuit statement and the second output signal controls a solid state control portion of the arc suppression circuit.

8. A control circuit as recited in claim 7 wherein the first output signal and the second output signal provide coordinated operation of the arc suppression circuit to reduce the arc at the electrical contact.

9. A control circuit as recited in claim 8 wherein the first output signal and the second output signal control a timing of the solid state control portion to be conducting when the electrical contact of the mechanical relay portion is opened or closed.

10. A control circuit as recited in claim 7 wherein the first output signal is electrically isolated from a mechanical relay within the mechanical relay portion.

11. A control circuit as recited in claim 7 wherein the first output signal is electrically isolated from a mechanical relay within the mechanical relay portion with a light emitting diode and a phototransistor.

12. A control circuit as recited in claim 7 wherein the second output signal is electrically isolated from a solid state device within the solid state control portion.

13. A control circuit as recited in claim 7 wherein the second output signal is electrically isolated from a solid state device within the solid state control portion with a photo-triac.

14. A control circuit as recited in claim 1 further comprising an isolation circuit disposed within the serial communication link.

15. A control circuit as recited in claim 1 wherein the microprocessor generates a serial output signal through the serial communication link, the serial output signal comprises a status signal corresponding to the status of the arc suppression circuit.

16. A control circuit as recited in claim 1 wherein the arc suppression circuit parameters include a voltage parameter.

17. A control circuit as recited in claim 1 wherein the arc suppression circuit parameters include a duty cycle parameter.

18. A control circuit as recited in claim 1 wherein the arc suppression circuit parameters include a pulse width parameter.

19. A control circuit as recited in claim 1 wherein the arc suppression circuit parameters include a conduction time parameter.

2. A control circuit comprising:

a serial communication link communicating a serial signal therethrough;

a microprocessor having a serial input communicating with the serial communication link and generating a control output signal in response to the serial signal; and

an arc suppression circuit having an electrical contact and operating in response to the control output signal to reduce an arc at the electrical contact, the microprocessor receiving arc suppression circuit parameters through the serial communication link, wherein the serial communication link comprises a two way serial communication link, the microprocessor communicating a status signal through the two way serial communication link.

20. A method of operating an arc suppression circuit comprising:

receiving a serial signal through a serial communication link, the serial signals including arc suppression circuit parameters having at least one of a duty cycle parameter, a pulse width parameter or a conduction time parameter;

generating a control output signal in response to the serial signal; and

controlling the arc suppression circuit having an electrical contact with the control output to reduce an arc at the electrical contact.