# US 4,398,120 A · Direct current supply particularly for cathode ray tube

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- Number: US 4,398,120 A
- Document ID: US4398120A
- Status: Granted
- Kind: A
- Application number: 06/252,808
- Filed: 1981-04-10
- Granted: 1983-08-09
- Earliest claimed: 1980-04-14
- Assignees: Thomson-CSF
- Inventors: Jean Pierre Guillon
- Web page: https://patentgrep.com/patent/US4398120A

## CPC

- H02M 3/28: using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H05G 1/02: Constructional details
- H05G 1/32: Supply voltage of the X-ray apparatus or tube
- 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)
- H05G: X-RAY TECHNIQUE (investigating or analysing materials by the use of X-rays G01N23/00; apparatus for X-ray photography G03B42/02; X-ray tubes H01J35/00; TV systems having X-ray input H04N5/321)

## Abstract

A direct current supply, making it possible to produce a number of separate regulated voltages from a single regulated supply, constituted by a voltage multiplier with cascade-connected doubler stages. One of the doubler stages, preferably the first, supplies by the connection point of its two rectifiers at least one circuit for generating a complementary d.c. voltage. This generator circuit comprises a variable capacitor connected downstream to two oppositely connected diodes and connected to earth or to a fixed d.c. potential, one directly and the other across a resistor and a capacitor connected in parallel.

## Claims

### Claim 1

A direct current supply of the voltage multiplier type comprising:
a plurality 2 n of capacitors and a plurality 2 n of rectifiers for supplying n cascade-connected voltage doubler stages and a first d.c. voltage whose value is substantially equal to 2 n times the peak value of an a.c. voltage applied to the input;
means for the regulation and control of the first voltage produced between the output terminal of the final stage and a terminal connected to the reference potential; and
at least one generator circuit for generating a second stabilized d.c. voltage formed from a first capacitor connected by a first end to the connecting point of the two rectifiers of a doubler stage and by its second end respectively to the input of a first rectifier and to the output of a second rectifier, said first capacitor being formed by an adjustable capacitor for varying the current provided from said connection point and therefore said second voltage, said first and second rectifiers being connected by their other end to the reference potential, said connection being in the case of one of them across a resistor connected in parallel with a second capacitor, the second voltage being taken at the terminals of the second capacitor.

### Claim 2 (depends on 1)

A d.c. supply according to claim 1, further including at least one said generator circuit provided with complementary means for producing a fixed d.c. voltage which is added to the voltage at the terminals of said second capacitor to increase said second stabilized output d.c. voltage.

### Claim 3 (depends on 2)

A d.c. supply according to claim 2, wherein said complementary means comprises a divider bridge with resistors connected between the output terminal of the doubler stage supplying the first capacitor and the reference potential, the bridge comprising at least two resistive components, whereof one is interposed on the connection from the rectifiers to the reference potential and comprises in parallel a third capacitor.

### Claim 4 (depends on 3)

A d.c. supply according to claim 3, wherein the voltage multiplier circuit supplies a very high regulated voltage and comprises at least two generator circuits, one of which being equipped with said complementary means to produce at least two regulated d.c. voltages, respectively a low voltage and a high voltage.

### Claim 5 (depends on 3)

A d.c. supply according to claim 3, wherein the said generator circuits and the voltage multiplier supply a cathode ray tube with at least one complementary d.c. voltage and a very high voltage respectively.

### Claim 6 (depends on 1, 3, 5)

A d.c. supply according to anyone of claims 1, 3, 5 wherein the first capacitor is connected by its first end to the connection point of the two rectifiers of the first voltage doubler stage.