# US 10,872,753 B2 ยท Precision high voltage power supply utilizing feedback through return side output > Agents: this data is available as JSON from the patentgrep API and MCP server โ€” see https://patentgrep.com/llms.txt - Number: US 10,872,753 B2 - Document ID: US10872753B2 - Status: Granted - Kind: B2 - Application number: 16/432,474 - Filed: 2019-06-05 - Published: 2020-01-30 - Granted: 2020-12-22 - Earliest claimed: 2018-07-25 - Assignees: Agilent Technologies, Inc. - Applicants: Agilent Technologies, Inc. - Inventors: David Deford - Web page: https://patentgrep.com/patent/US10872753B2 ## CPC - 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)} - H01J 49/025: {Detectors specially adapted to particle spectrometers (data acquisition H01J49/0036; detectors per se G01T, e.g. G01T1/28, G01T1/29)} - H01J 49/40: Time-of-flight spectrometers (H01J49/36 takes precedence) - H02M 1/0003: {Details of control, feedback or regulation circuits} - H02M 1/143: {using compensating arrangements (for reducing noise from the supply in transmission systems H04B15/005)} - H02M 1/15: using active elements - H02M 3/33507: {with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence)} - H02M 1/0045: {Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode} - H02M 1/0077: {Plural converter units whose outputs are connected in series} - H02M 1/0093: {wherein the output is created by adding a regulated voltage to or subtracting it from an unregulated input} - H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H) - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) ## Abstract In one embodiment, a high voltage power supply includes a DC voltage input, a converter for converting a DC voltage at the DC voltage input to an AC voltage, a booster for boosting the AC voltage to a boosted AC voltage, a rectifier in DC isolation from the DC voltage input, the rectifier operable to convert the boosted AC voltage to a high DC voltage at an isolated rectifier output, a high voltage DC output for outputting the high DC voltage, a voltage control input, and an error circuit coupled to the voltage control input and operable to reduce variation in the high DC voltage by driving a return side of the isolated rectifier output in response to feedback based on the high DC voltage. ## Claims ### Claim 1 A high voltage power supply comprising: a DC voltage input; a converter for converting a DC voltage at the DC voltage input to an AC voltage; a booster for boosting the AC voltage to a boosted AC voltage; a rectifier in DC isolation from the DC voltage input, the rectifier operable to convert the boosted AC voltage to a high DC voltage at an isolated rectifier output; a high voltage DC output for outputting the high DC voltage; a voltage control input; and an error circuit coupled to the voltage control input and operable to reduce variation in the high DC voltage by driving a return side of the isolated rectifier output in response to feedback based on the high DC voltage. ### Claim 2 (depends on 1) The high voltage power supply of claim 1, wherein the error circuit is operable to reduce the variation in the high DC voltage to less than about 10 ppm. ### Claim 3 (depends on 1) The high voltage power supply of claim 1, further comprising: a coarse voltage input, wherein the converter converts the DC voltage at the DC voltage input to an AC voltage based on a signal at the coarse voltage input. ### Claim 4 (depends on 3) The high voltage power supply of claim 3, further including an integrator coupled to an output of the error circuit and to the coarse voltage input for maintaining an output of the error circuit within a prescribed range of a desired setting. ### Claim 5 (depends on 4) The high voltage power supply of claim 4, wherein the prescribed range is about +/โˆ’10V. ### Claim 6 (depends on 1) The high voltage power supply of claim 1, further comprising: a voltage divider for providing a portion of the high DC voltage as input to the error circuit, the voltage divider having a first resistor connected to the high voltage DC output and a second resistor connected in series with the first resistor; and a first capacitor connected in parallel with the first resistor and a second capacitor connected in parallel with the second resistor, wherein the capacitance ratio of the second capacitor to the first capacitor is substantially equal to the resistance ratio of the first resistor to the second resistor. ### Claim 7 (depends on 1) The high voltage power supply of claim 1, further comprising: a voltage divider for providing a portion of the high DC voltage as input to the error circuit, the voltage divider having a first resistor connected to the high voltage DC output and a second resistor connected in series with the first resistor; and a first capacitor connected in parallel with the first resistor and a second capacitor connected in parallel with the second resistor, wherein a time constant of the first resistor with the first capacitor is greater than a time constant of the second resistor with the second capacitor. ### Claim 8 (depends on 1) The high voltage power supply of claim 1, further comprising a filter for filtering the isolated rectifier output voltage. ### Claim 9 (depends on 1) The high voltage power supply of claim 1, further including a polarity circuit for changing the output high voltage polarity between positive and negative. ### Claim 10 (depends on 1) An instrument including the high voltage power supply of claim 1, the instrument further comprising: a source; a chamber; and a detector, wherein the high voltage power supply is operable to induce motion of charged particles emitted from the source in the chamber, and wherein the detector is operable to sense an outcome due to the motion of the particles. ### Claim 11 (depends on 10) The instrument of claim 10, wherein said instrument is a time-of-flight (TOF) mass spectrometer (MS). ### Claim 12 A method comprising: converting a DC voltage at a DC voltage input to an AC voltage; boosting the AC voltage to a boosted AC voltage; using a rectifier to convert the boosted AC voltage to a high DC voltage for output at an isolated rectifier output; receiving a voltage control input; reducing variation in the high DC voltage by driving a return side of the isolated rectifier output in response to feedback based on the high DC voltage. ### Claim 13 (depends on 12) The method of claim 12, wherein the variation reduction is to less than about 10 ppm. ### Claim 14 (depends on 12) The method of claim 12, further comprising: receiving a coarse voltage input, wherein said converting comprises converting the DC voltage at the DC voltage input to an AC voltage based on a signal at the coarse voltage input. ### Claim 15 (depends on 14) The method of claim 14, wherein said driving is performed by an error circuit coupled to the isolated rectifier output, said method further comprising: maintaining an output of the converter within a prescribed range of a desired setting by integrating an output of the error circuit. ### Claim 16 (depends on 15) The method of claim 15, wherein the prescribed range is about +/โˆ’10V. ### Claim 17 (depends on 12) The method of claim 12, wherein said driving is performed by an error circuit coupled to the isolated rectifier output, said method further comprising: using a a voltage divider to provide a portion of the high DC voltage as input to the error circuit, the voltage divider having a first resistor connected to the high voltage DC output and a second resistor connected in series with the first resistor; and providing a first capacitor connected in parallel with the first resistor and a second capacitor connected in parallel with the second resistor, wherein the capacitance ratio of the second capacitor to the first capacitor is substantially equal to the resistance ratio of the first resistor to the second resistor. ### Claim 18 (depends on 12) The method of claim 12, wherein said driving is performed by an error circuit coupled to the isolated rectifier output, said method further comprising: using a a voltage divider to provide a portion of the high DC voltage as input to the error circuit, the voltage divider having a first resistor connected to the high voltage DC output and a second resistor connected in series with the first resistor; and providing a first capacitor connected in parallel with the first resistor and a second capacitor connected in parallel with the second resistor, wherein a time constant of the first resistor with the first capacitor is greater than a time constant of the second resistor with the second capacitor. ### Claim 19 (depends on 12) The method of claim 12, further comprising; filtering the isolated rectifier output voltage. ### Claim 20 (depends on 12) The method of claim 12, further including providing a polarity circuit for changing the output high voltage polarity between positive and negative.