Control unit for triggering a personal protection arrangement

• US 8,659,269 B2
• Filed: 10/07/2005
• Issued: 02/25/2014
• Est. Priority Date: 12/15/2004
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Schumacher, Hartmut
• Primary Examiner(s): Tso, Edward
• Assistant Examiner(s): PIGGUSH, AARON C
• Application Number:
  US11/793,194
• Publication Number:
  US 20090096429A1
• Time in Patent Office: 3,063 Days
• Field of Search: 320/134, 320/163, 320/104
• US Class Current: 320/163
• CPC Class Codes: B60R 21/017 including arrangements for providing electric power to safety arrangements or their actuating means, e.g. to pyrotechnic fuses or electro-mechanic valves

Abstract

A control unit for triggering the personal protection arrangement, including a first semiconductor module that is configured to make available various supply voltages and to charge an energy reserve, and including at least one second semiconductor module that is likewise configured to charge the energy reserve, the first and the second semiconductor module each having a semiconductor support.

Claims

1. A control unit for triggering a personal protection arrangement, comprising:

a first semiconductor module that is configured to generate supply voltages and charge an energy reserve from an external voltage source; and

at least one second semiconductor module having an internal resistance coupled in parallel to an internal resistance of the first semiconductor module, the at least one second semiconductor module configured to charge the energy reserve from the external voltage source;

wherein the first semiconductor module and the at least one second semiconductor module each include a heat dissipating medium, wherein the control unit triggers the personal protection arrangement.

2. The control unit of claim 1, wherein the first semiconductor module and the at least one second semiconductor module are configured to charge the energy reserve to a voltage level of a vehicle battery.

3. The control unit of claim 1, wherein the first semiconductor module includes a voltage down-converter to supply a first supply voltage to at least one first sensor coupled to the control unit, and wherein the at least one second semiconductor module derives the first supply voltage from a voltage level of a vehicle battery and supplies the derived first supply voltage to at least one second sensor coupled to the control unit.

4. The control unit of claim 1, wherein the at least one second semiconductor module includes a circuit for detecting a failure of a vehicle battery.

5. The control unit of claim 4, wherein, the first semiconductor module is coupled to the at least one second semiconductor module to interrupt charging and instead supply a sensor with a first supply voltage responsive to the detected failure of the vehicle battery.

6. The control unit of claim 5, wherein the first semiconductor module is configured to charge the energy reserve to a superelevated voltage, and, responsive to the detected failure of the vehicle battery, the first semiconductor module prevents a voltage up-converter from generating the superelevated voltage.

7. The control unit of claim 1, wherein the first semiconductor module and the at least one second semiconductor module each include a respective circuit for linking sensors, controlling switches, controlling firing circuits, and communicating with data lines.

8. The control unit of claim 1, wherein the heat dissipating medium of the first semiconductor module dissipates a maximum heat load on the first semiconductor module.

9. The control unit of claim 1, wherein the heat dissipating medium is a silicon substrate.

10. The control unit of claim 1, wherein the first semiconductor module and the at least one second semiconductor module are configured to charge the energy reserve to a voltage level of a vehicle battery, wherein the first semiconductor module includes a voltage down-converter to supply a first supply voltage to at least one first sensor coupled to the control unit, and wherein the at least one second semiconductor module derives the first supply voltage from the voltage level of the vehicle battery and supplies the derived first supply voltage to at least one second sensor coupled to the control unit.

11. The control unit of claim 10, wherein the first semiconductor module and the at least one second semiconductor module each include a respective circuit for linking sensors, controlling switches, controlling firing circuits, and communicating with data lines, and wherein the heat dissipating medium of the first semiconductor module dissipates a maximum heat load on the first semiconductor module, and wherein the heat dissipating medium is a silicon substrate.

12. The control unit of claim 1, wherein the at least one second semiconductor module includes a circuit for detecting a failure of a vehicle battery, wherein the first semiconductor module is coupled to the at least one second semiconductor module to interrupt charging and instead supply a sensor with a first supply voltage responsive to the detected failure of the vehicle battery, wherein the first semiconductor module is configured to charge the energy reserve to a superelevated voltage, and, responsive to the detected failure of the vehicle battery, the first semiconductor module prevents a voltage up-converter from generating the superelevated voltage, and wherein the heat dissipating medium is a silicon substrate.

13. The control unit of claim 12, wherein the first semiconductor module and the at least one second semiconductor module each include a respective circuit for linking sensors, controlling switches, controlling firing circuits, and communicating with data lines, and wherein the heat dissipating medium of the first semiconductor module dissipates a maximum heat load on the first semiconductor module.

14. The control unit of claim 1, wherein the personal protection arrangement is an airbag.

15. A control unit for triggering a personal protection arrangement, comprising:

a first semiconductor module that is configured to generate supply voltages and charge an energy reserve from an external voltage source through a charging circuit of the first semiconductor module; and

at least one second semiconductor module having an internal resistance of a saturated transistor in a charging circuit of the second semiconductor module coupled in parallel to an internal resistance of a corresponding saturated transistor in the charging circuit of the first semiconductor module, the charging circuit of the second semiconductor module configured to also charge the energy reserve and each of the semiconductor modules configured to generate distinct supply voltages from the external voltage source;

wherein the first semiconductor module and the at least one second semiconductor module each include a heat dissipating medium.

16. The control unit of claim 15, wherein the second semiconductor module includes an interface to provide power to an external sensor directly from the external voltage source when a voltage of the external voltage source exceeds a threshold and otherwise provide power to the external sensor from the first semiconductor module.

17. The control unit of claim 15, wherein responsive to the external voltage source exceeding a threshold while the energy reserve is not precharged, the charging circuits in the first and the second semiconductor modules are coupled to the external voltage source to charge the energy reserve in parallel while external sensors connected to the first and the second semiconductor modules are unpowered, wherein responsive to the external voltage source exceeding the threshold while the energy reserve is precharged, the charging circuits in the first and the second semiconductor modules are coupled to the external sensors, each of the charging circuits powering at least one of the external sensors, and wherein responsive to the external voltage source not exceeding the threshold, the charging circuits in the first and the second semiconductor modules are inhibited and the first semiconductor module exclusively powers each of the external sensors.

18. The control unit of claim 15, wherein the first semiconductor module and the at least one second semiconductor module are configured to charge the energy reserve to a voltage level of a vehicle battery, wherein the first semiconductor module includes a voltage down-converter to supply a first supply voltage to at least one first sensor coupled to the control unit, and wherein the at least one second semiconductor module derives the first supply voltage from the voltage level of the vehicle battery and supplies the derived first supply voltage to at least one second sensor coupled to the control unit.

19. The control unit of claim 15, wherein the at least one second semiconductor module includes a circuit for detecting a failure of a vehicle battery, wherein the first semiconductor module is coupled to the at least one second semiconductor module to interrupt charging and instead supply a sensor with a first supply voltage responsive to the detected failure of the vehicle battery, wherein the first semiconductor module is configured to charge the energy reserve to a superelevated voltage, and, responsive to the detected failure of the vehicle battery, the first semiconductor module prevents a voltage up-converter from generating the superelevated voltage, and wherein the heat dissipating medium is a silicon substrate.

20. The control unit of claim 15, wherein the personal protection arrangement is an airbag.