EP0257810A2
Expired / Lapsed
EP
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DC to DC converter
Assignee: Plessey Overseas Ltd
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Filing: 1987-07-28
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Granted: —
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Expires: 2007-07-28
Abstract
Abstract A DC to DC converter of the switched capacitor kind is described in which controlled solid state switches are used to effect the switching and to limit the current passed to the capacitors in dependence upon that required to match a load.
Inventors
- 👤 Simon Atkinson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 18:15
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/06; H02M3/07; H02M1/00; H02M1/0045
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
93 words
A DC to DC converter comprising at least one input charge storage device, an output charge storage device, timing means for repetitively initiating a charge input cycle and a voltage conversion cycle, means for connecting the input charge storage device or devices with a source during a charge input cycle and for connecting the charge input device or devices in series with a source and the output charge storage device during a voltage conversion cycle, and means responsive to the voltage appearing on the output charge storage device for controlling the connecting means.
Claim 2
Dependent Claim
93 words
A DC to DC converter comprising at least one input charge storage device, an output charge storage device, timing means for repetitively initiating a charge input cycle and a voltage conversion cycle, means for connecting the input charge storage device or devices with a source during a charge input cycle and for connecting the charge input device or devices in series with a source and the output charge storage device during a voltage conversion cycle, and means responsive to the voltage appearing on the output charge storage device for controlling the connecting means.
Claim 3
Dependent Claim
50 words
A converter as claimed in claim 1 wherein the connecting means comprises first bipolar means for connecting the input charge storage device or devices with a source during a charge input cycle and for isolating the input charge storage device or devices from the source during a voltage conversion cycle.
Claim 4
Dependent Claim
55 words
A converter as claimed in claim 1 or 2 wherein the connecting means includes second bipolar means for connecting the input charge storage device or devices in series with a source and with the output charge storage device during a voltage conversion cycle and for isolating the output charge storage device during a charging cycle.
Claim 5
Dependent Claim
66 words
A converter as claimed in claim 2 or claims 2 and 3 wherein the first bipolar means comprises a first transistor switch between the or each of the input charge storage devices and a source, and a second transistor switch between the or each input charge storage device and ground so as to isolate the or each input charge storage device when the switches are open.
Claim 6
Dependent Claim
45 words
A converter as claimed in claim 3 or claim 3 and 4 wherein the second bipolar means comprises transistor switches for connecting the output charge storage device in series with the or each input charge storage device and a source during a voltage conversion cycle.
Claim 7
Dependent Claim
37 words
A converter as claimed in claim 4 and 5 wherein the transistor switches are controlled by the voltage responsive means, when closed, to pass a current in dependence upon the voltage of the output charge storage device.
Claim 8
Dependent Claim
22 words
A converter as claimed in claim 6 wherein the transistor switches have matched characteristics so as to pass identical currents when closed.
Claim 9
Dependent Claim
25 words
A converter as claimed in claim 4, 5, 6 or 7 wherein each transistor switch comprises a PNP and an NPN transistor in darlington configuration.
Claim 10
Dependent Claim
57 words
A converter as claimed in any preceding claim wherein the voltage responsive means comprises a comparator, a first input to the comparator being related to the voltage on the output charge storage device and a second input to the comparator being a reference voltage, a difference signal being output by the comparator to control the connecting means.
Claim 11
Dependent Claim
24 words
A DC to DC converter substantially as hereinbefore described with reference to Figure 4 or Figure 7, and Figure 6 of the accompanying drawings.
Claim 12
Dependent Claim
24 words
A DC to DC converter substantially as hereinbefore described with reference to Figure 4 or Figure 7, and Figure 6 of the accompanying drawings.
References Cited (Backward Citations)
No citation records indexed.
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