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1. WO2021059194 - ULTRA LOW NOISE FLOATED HIGH VOLTAGE SUPPLY FOR MASS SPECTROMETER ION DETECTOR

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[ EN ]

What is claimed is:

1. A high-voltage power supply system for use in a mass spectrometer, comprising:

a ground-referenced power supply having a first transformer comprising a primary winding and a secondary winding, said primary winding being electrically coupled to a first source of AC power,

a floated bias voltage power supply having a second transformer comprising a primary winding and a secondary winding, said primary winding of said second transformer being electrically coupled to a second source of AC power,

wherein a return electrical path of said floated bias voltage power supply is electrically coupled to said ground-referenced power supply so as to bias an output voltage of said ground-referenced power supply,

a floating shield disposed around said floated bias voltage power supply, and

at least one resistive element disposed in said return electrical path of said floated bias voltage power supply to reduce noise coupled from said floated bias voltage power supply to said ground-referenced power supply.

2. The high-voltage power supply system of claim 1, wherein said floating shield provides a low AC impedance path from said return electrical path of said floated bias voltage power supply to the ground.

3. The high-voltage power supply system of claim 2, wherein said at least one resistive element is coupled in series with a capacitance associated with said floating shield so as to enhance impedance of said return electrical path.

4. The high-voltage power supply system of claim 3, wherein said at least one resistive element has a resistance in a range of about 10 kQ to about 1 MW.

5. The high-voltage power supply system of claim 4, wherein said at least one resistive element has a resistance in a range of about 100 kQ to about 1 MW.

6. The high-voltage power supply system of claim 3, wherein said capacitance associated with said floating shield is in a range of about 6 pF to about 100 nF.

7. The high-voltage power supply system of claim 6, wherein said capacitance associated with said floating shield is in a range of about 100 pF to about 50 nF.

8. The high-voltage power supply system of claim 1, further comprising a Faraday shield disposed in said second transformer so as to reduce parasitic coupling between the secondary winding and the primary winding of said second transformer.

9. The high-voltage power supply system of claim 8, wherein said Faraday shield reduces said coupling by at least about 2 pF.

10. The high-voltage power supply system of claim 8, wherein said Faraday shield reduces said coupling by a factor in a range of about 2 to about 100.

11. The high-voltage power supply system of claim 1, wherein said return electrical path is capacitively coupled to the ground via at least one capacitor.

12. The high-voltage power supply system of claim 1, wherein said ground-referenced power supply provides an output voltage in a range of about 0 to about 20 kV.

13. The high-voltage power supply system of claim 10, wherein said floated bias voltage power supply provides a bias voltage in a range of about 0 to about 10 kV.

14. The high-voltage power supply system of claim 1, wherein said floated bias voltage power supply is coupled to an ion detector of said mass spectrometer to apply a bias voltage thereto.

15. A mass spectrometer, comprising:

a mass analyzer,

an ion detector disposed downstream of said mass analyzer, and

a high-voltage power supply system configured to apply a high voltage to said ion detector, wherein said high-voltage power supply system comprises:

a ground-referenced power supply having a first transformer comprising a primary winding and a secondary winding, said primary winding being electrically coupled to a first source of AC power,

a floated bias voltage power supply having a second transformer comprising a primary winding and a secondary winding, said primary winding of said second transformer being electrically coupled to a second source of AC power,

wherein a return electrical path of said floated bias voltage power supply is electrically coupled to said ground-referenced power supply so as to bias an output voltage of said ground-referenced power supply,

a floating shield disposed around said floating bias power supply, and

at least one resistive element disposed in said return electrical path of said floated bias voltage power supply to reduce noise coupled from said floated bias voltage power supply to said ground-referenced power supply.

16. The mass spectrometer of claim 15, wherein said floating shield provides a low AC impedance path from said return electrical path of said floated bias voltage power supply to the ground.

17. The mass spectrometer of claim 15, wherein said at least one resistive element is coupled in series with a capacitance associated with said floating shield so as to enhance impedance of said return electrical path.

18. The mass spectrometer of claim 17, wherein said at least one resistive element has a resistance in a range of about 10 kQ to about 1 MW.

19. The mass spectrometer of claim 18, wherein said capacitance associated with said floating shield is in a range of about 6 pF to about 100 nF.

20. The mass spectrometer of claim 15, wherein said return electrical path is capacitively coupled to the ground via at least one capacitor.