APPARATUS FOR PROVIDING POWER TO A MULTIPOLE IN A MASS SPECTROMETER

• US 20110278946A1
• Filed: 11/15/2010
• Published: 11/17/2011
• Est. Priority Date: 11/16/2009
• Status: Active Grant

• Current Assignee: DH Technologies Development Pte. Ltd. (Danaher Corporation)
• Original Assignee: DH Technologies Development Pte. Ltd. (Danaher Corporation)
• Inventors: Vandermey, John
• Granted Patent: US 8,847,433 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01F 19/04 Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range resonant circuits H03H
• CPC Class Codes: H01J 49/022 Circuit arrangements, e.g. for generating deviation currents or voltages regulating electric or magnetic variables in general, e.g. current, magnetic field G05F; Components associated with high voltage supply high voltage supply per se H02M
• CPC Class Codes: H01J 49/422 Two-dimensional RF ion traps ion guides without mass selection H01J49/062
• CPC Class Codes: H02M 7/48 using discharge tubes with control electrode or semiconductor devices with control electrode
• CPC Class Codes: H02M 7/4815 Resonant converters H02M7/4811 and H02M7/4826 take precedence
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

An apparatus for providing power to a multipole in a mass spectrometer is provided. The apparatus comprises a first resonant LC circuit; at least one inductor for forming a second resonant LC circuit with the multipole, the second resonant LC circuit connected in cascade with the first resonant LC circuit, when the at least one inductor is connected to the multipole; an RF power source for providing an RF signal; and a step-up transformer connected in parallel to the RF power source on a primary side and the first resonant LC circuit on a secondary side, the step-up transformer providing voltage gain for the RF signal thereby reducing the loaded Q of the resonant LC circuits.

Claims

1. An apparatus for providing power to a multipole in a mass spectrometer, the apparatus comprising:

a first resonant LC circuit;

at least one inductor for forming a second resonant LC circuit with said multipole, said second resonant LC circuit connected in cascade with said first resonant LC circuit, when said at least one inductor is connected to said multipole;

an RF power source for providing an RF signal; and

a step-up transformer connected in parallel to said RF power source on a primary side and said first resonant LC circuit on a secondary side, said step-up transformer providing voltage gain for said RF signal thereby reducing the loaded Q of said resonant LC circuits.

2. The apparatus of claim 1, further comprising at least one further resonant LC circuit between said first resonant LC circuit and said second resonant LC circuit, said first resonant LC circuit, said at least one further resonant LC circuit, and said second resonant LC circuit connected in cascade, when said at least one inductor is connected to said multipole.

3. The apparatus of claim 1, wherein a capacitor in said second resonant LC circuit comprises said multipole, when said at least one inductor is connected to said multipole.

4. The apparatus of claim 1, wherein said RF power source comprises an integrated apparatus (IC) power source.

5. The apparatus of claim 1, wherein said RF power source is operable in a range of substantially 500 kHz to 5 MHz.

6. The apparatus of claim 1, wherein said voltage gain is substantially between 50 and 500.

7. The apparatus of claim 1, wherein said loaded Q=((Vg^1/n)−

1)^1/2 and Vg is the voltage gain for said apparatus.

8. The apparatus of claim 1, wherein said multipole comprises at least one of a quadrupole, hexapole and an octopole.

9. A method for providing power to a multipole in a mass spectrometer, the method comprising:

controlling a circuit to produce an RF signal, said circuit comprising;

a first resonant LC circuit;

at least one inductor for forming a second resonant LC circuit with said multipole, said second resonant LC circuit connected in cascade with said first resonant LC circuit, when said at least one inductor is connected to said multipole;

an RF power source for providing an RF signal; and

a step-up transformer connected in parallel to said RF power source on a primary side and said first resonant LC circuit on a secondary side, said step-up transformer providing voltage gain for said RF signal thereby reducing the loaded Q of said resonant LC circuits.

10. The method of claim 9, wherein said circuit further comprises at least one further resonant LC circuit between said first resonant LC circuit and said second resonant LC circuit, said first resonant LC circuit, said at least one further resonant LC circuit, and said second resonant LC circuit connected in cascade, when said at least one inductor is connected to said multipole.

11. The method of claim 9, wherein a capacitor in said second resonant LC circuit comprises said multipole, when said at least one inductor is connected to said multipole.

12. The method of claim 9, wherein said RF power source comprises an integrated apparatus (IC) power source.

13. The method of claim 9, further comprising operating said RF power source in a range of substantially 500 kHz to 5 MHz.

14. The method of claim 9, wherein said voltage gain is substantially between 50 and 500.

15. The method of claim 9, wherein said loaded Q=((Vg^1/n)−

1)^1/2 and Vg is the voltage gain for said apparatus.

16. The method of claim 9, wherein said multipole comprises at least one of a quadrupole, hexapole and an octopole.