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US 7,009,162 B2Granted
Photomultiplier power supply with primary and secondary transformer windings
AssigneeBaker Hughes Incorporated
InventorsJoseph C. Koudelka, Carlos E. Haramboure
Life of this patent
Estimating the term…
Abstract
A method and apparatus for providing a photomultiplier power supply having a transformer with multiple secondary windings forming cells that can provide voltage ratios to a photomultiplier element in which the ratios can be adjusted by the method of connection to the cell, by the number of turns in the transformer, or by a combination of both.
Claims16
A photomultiplier power supply comprising:
- (a) a primary transformer winding for receiving an input voltage;
- (b) a plurality of power supply cells, wherein each cell comprises:
- (c) a secondary winding coupled to the primary transformer winding;
- (d) a first diode having a cathode connected to a high side of the secondary winding;
- (e) a second diode having an anode connected to the high side of the secondary winding;
- (f) a center tap connected to a low side of the secondary winding;
- (g) a first capacitor having a first side connected to the center tap and a second side connected to an anode of the first diode;
- (h) a second capacitor having a first side connected to the center tap and a second side connected to a cathode of the second diode;
- (i) a positive terminal of a given cell connected to a negative terminal of a following cell;
- (j) a negative terminal of a first cell connected to a photo cathode, a first center tap connected to a first dynode, and a second dynode connected to a positive terminal of the first cell;
- and
- (k) a connection pattern of connections (d) through (j) repeated until a positive terminal for a last cell is connected to a resistor connected in series with an anode terminal wherein any unused terminal in a last cell is left unconnected.
9 more elements
A method for providing a photomultiplier power supply comprising:
- (a) coupling a primary transformer winding for receiving an input voltage to a secondary winding comprising a plurality of power supply cells;
- (b) connecting a first diode having a cathode to a high side of the secondary winding;
- (c) connecting a second diode having an anode connected to the high side of the secondary winding;
- (d) connecting a center tap to a low side of the secondary winding;
- (e) connecting a first capacitor having a first side connected to the center tap and a second side connected to an anode of the first diode;
- (f) connecting a first side of a second capacitor to the center tap and connecting a second side of the second capacitor to a cathode of the second diode;
- (g) connecting a positive terminal of a given cell to a negative terminal of a following cell;
- (h) connecting a negative terminal of a first cell to a photo cathode, connecting a first center tap to a first dynode, and connecting a second dynode to a positive terminal of the first cell;
- and repeating (b) through (g) until a positive terminal for a last cell is connected to a resistor connected in series with an anode terminal;
- and
- leaving unconnected any unused terminal in a last cell.
8 more elements
A system for providing power to a photomultiplier for measuring at least one of counts and pulse heights using a down hole tool having a photomultiplier tube and photomultiplier power supply comprising:
- (b) a down hole tool for traversing a well bore formed in the earth, the tool further comprising;
- (c) a photomultiplier tube;
- (d) a photomultiplier power supply comprising a primary transformer winding for receiving an input voltage;
- (e) a plurality of power supply cells, wherein each cell comprises:
- (f) a secondary winding coupled to the primary winding;
- (g) a first diode having a cathode connected to a high side of the secondary winding;
- (h) a second diode having an anode connected to the high side of the secondary winding;
- (i) a center tap connected to a low side of the secondary winding;
- (j) a first capacitor having a first side connected to the center tap and a second side connected to the anode of the first diode;
- (k) a second capacitor having a first side connected to the center tap and a second side connected to a cathode of the second diode;
- (l) a positive terminal of a given cell connected to a negative terminal of a following cell;
- (m) a negative terminal of a first cell connected to a photo cathode, a first center tap connected to a first dynode, and a second dynode connected to a positive terminal of a first cell;
- and
- (n) series repeated until a resistor connected in series with an anode terminal is reached wherein any unused terminal in a last cell is left unconnected.
11 more elements
A method for providing power to a photomultiplier in a down hole tool having a photomultiplier tube and photomultiplier power supply comprising:
- (a) traversing a well bore formed in the earth, with a down hole tool, the tool further comprising a photomultiplier tube;
- (b) providing power to the photomultiplier further comprising,
- (c) coupling a primary transformer winding for receiving an input voltage to a secondary winding comprising a plurality of power supply cells;
- (d) connecting a first diode having a cathode to a high side of the secondary winding;
- (e) connecting a second diode having an anode to the high side of the secondary winding;
- (f) connecting a center tap connected to a low side of the secondary winding;
- (g) connecting a first capacitor having a first side connected to the center tap and a second side connected to an anode of the first diode;
- (h) connecting a first side of a second capacitor to the center tap and connecting a second side of the second capacitor to a cathode of the second diode;
- connecting a positive terminal of a given cell to a negative terminal of a following cell;
- (i) connecting a negative terminal of a first cell to a photo cathode, connecting a first center tap to a first dynode, and connecting a second dynode to a positive terminal of the first cell;
- and
- (j) repeating a connection series until a resistor connected in series with an anode terminal is reached;
- and
- (k) leaving unconnected any unused terminal in a last cell.
11 more elements
Dependencies are inferred from the claim text.