GB2349283A - Isolated power supply for a peripheral device coupled to a computer - Google Patents
Isolated power supply for a peripheral device coupled to a computer Download PDFInfo
- Publication number
- GB2349283A GB2349283A GB9908749A GB9908749A GB2349283A GB 2349283 A GB2349283 A GB 2349283A GB 9908749 A GB9908749 A GB 9908749A GB 9908749 A GB9908749 A GB 9908749A GB 2349283 A GB2349283 A GB 2349283A
- Authority
- GB
- United Kingdom
- Prior art keywords
- port
- power source
- computer
- power
- peripheral device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000002093 peripheral effect Effects 0.000 title claims abstract description 40
- 238000002955 isolation Methods 0.000 claims abstract description 24
- 230000004888 barrier function Effects 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 abstract description 8
- 238000012546 transfer Methods 0.000 abstract description 3
- 238000012806 monitoring device Methods 0.000 abstract description 2
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000036772 blood pressure Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/266—Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/30—Input circuits therefor
- A61B5/301—Input circuits therefor providing electrical separation, e.g. by using isolating transformers or optocouplers
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Pathology (AREA)
- Medical Informatics (AREA)
- Power Engineering (AREA)
- Veterinary Medicine (AREA)
- General Engineering & Computer Science (AREA)
- Biophysics (AREA)
- Public Health (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Theoretical Computer Science (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Power Sources (AREA)
Abstract
A power supply coupled between a data port of a computer and a peripheral device 1 converts data signals received from the computer into an electrical power signal and transfers power from the power signal to the peripheral device across an electrical isolation barrier T1. The peripheral device may be a physiological monitoring device (eg. for EEG or ECG signals) and the data port may be an RS-232 port which does not have dedicated power supply lines. Diodes D1, D2, D3 and capacitors C1, C2 are connected to the DTR, RTS and TXD lines of the port to derive positive and negative supply voltages for a switch mode converter 14 which powers the peripheral device via an isolating transformer T1. The switch mode converter may have a soft start feature (Fig. 3). Data and control signals are exchanged between the port and the peripheral device via opto-isolators. A USB or IEEE 1394 port may be utilised (Fig.4) instead of an RS-232 port.
Description
ISOLATED POWER SOURCES
The present invention relates to isolated power sources and more particularly, though not necessarily, to isolated power sources for supplying power to physiological measurement devices and instruments.
A large and varied range of medical recording equipment is available to medical practitioners to assist in the monitoring, diagnosis, and treatment of patients. For example, equipment is available for recording heart rate, electrocardiograms (ECGs), electroencephalograms (EEGs), and blood pressure. As such equipment is extremely specialised, and the demand is small relative to the demand for consumer products, the equipment tends to be expensive. Indeed, high cost tends to be a feature common to much medical equipment including that used for diagnosis and treatment.
The high cost of medical equipment is often due at least in part to the need to electrically isolate instruments intended to be placed into contact with parts of the human body both to protect patients from dangerous power spikes and surges and to protect the instruments themselves from potential sources of interference.
It is an object of the present invention to provide an isolated power source for powering peripheral devices and which is relatively low in cost. It is a further object of the present invention to provide an isolated power source which facilitates the connection of peripheral devices to computers or other standard electronic equipment to exchange digital data therewith and to provide power for the peripheral devices.
These and other objects are achieved at least in part by providing an isolated power source arranged to be coupled to the serial port of a computer or computer device, and which can convert digital data signals received from the computer or computer device into power for supplying to a peripheral device across an isolation barrier.
According to a first aspect of the present invention there is provided a power source for coupling between an input/output data port of a computer and a peripheral device, the power source comprising :
a data port arranged in use to be connected to said computer port to receive digital data signals therefrom;
output means for coupling to said peripheral device to provide electrical power to the peripheral device;
conversion means for converting at least a part of the data signals received from the computer port at said power source data port into an electrical power signal; and
isolation means including an isolation barrier, coupled between said conversion means and said output means for transferring power from said power signal from the conversion means to the output means across the isolation barrier.
The power source according to the present invention enables specialised peripheral devices to be coupled to standard input/output data ports of computers. As a result, the need for additional specialised interface and/or control and recording apparatus is obviated or eliminated. Moreover, the provision of power and the transfer and processing of digital data may be handled by a single standard computer.
It will be appreciated that the term"computer"as used here refers to personal computers and workstations as well as to other electronic equipment utilising computer processors.
Preferably, the conversion means of the power source comprises an inverter. More preferably, the inverter is a switched mode power supply.
Preferably, the isolation barrier of the isolation means is a transformer. Alternatively, the isolation barrier may comprise a capacitor.
Preferably, said data port of the power source is a serial port and is arranged to be coupled to a serial port of a computer. More preferably, these serial ports are RS-232 ports. Alternatively however, the data port of the power source is a USB port arranged to be coupled to a corresponding USB port of a computer.
According to a second aspect of the present invention there is provided an interface unit comprising a power source according to the above first aspect of the invention, the unit comprising means for transferring digital data signals received from the computer at said data port to the peripheral device. Data signals may be transferred across said isolation barrier or via a second output means of the interface unit.
Preferably, the interface unit comprises means for receiving data signals from a peripheral device. These signals may be analogue or digital. More preferably the unit comprises means for coupling the received data signals to the said data port of the power source for transmission to the computer data port (after analogue to digital conversion if necessary).
In certain embodiments of the present invention, the interface unit comprises active and/or passive electrical circuits for processing digital data received from the computer or the peripheral device. For example, the unit may comprise an amplifier for amplifying signals received from a peripheral device and/or an analogue to digital converter for converting analogue signals received from a peripheral device into digital signals for transmission to a computer. The interface unit may also comprise for example filters and microprocessors.
According to a third aspect of the present invention there is provided apparatus for monitoring physiological parameters from a patient, the apparatus comprising:
monitoring means for attachment to a patient and arranged in use to generate electrical signals corresponding to monitored physiological parameters;
a power source having a data port arranged in use to be connected to a data port of a computer to receive digital data signals therefrom, output means coupled to said monitoring means to provide electrical power to the monitoring means, conversion means for converting at least a part of the digital data signals received from the computer port at the power source data port into an electrical power signal, and isolation means including an isolation barrier, coupled between said conversion means and said output means for transferring power from said power signal, from the conversion means to the output means across the isolation barrier.
According to a fourth aspect of the present invention there is provided a method of coupling power and digital data signals between a peripheral device and a computer having an input/output data port, the method comprising the steps of : receiving digital data signals from the computer data port;
converting said received digital data signals into a power signal;
transferring power from said power signal across an isolation boundary; and
providing said transferred power to a peripheral device.
For a better understanding of the present invention and in order to show how the same may be carried into effect reference will now be made, by way of example, to the accompanying drawings, in which:
Figure I illustrates in block diagram form an isolated low power source coupled between a personal computer and a peripheral monitoring device;
Figure 2 illustrates the isolated low power source of the arrangement of Figure 1 ;
Figure 3 illustrates a modification to the isolated low power source of Figure 2; and
Figure 4 illustrates an alternative isolated low power source utilising a USB port of a computer.
With reference to the block diagram of Figure 1, there is illustrated a peripheral device 1 which requires a DC power voltage 2 for its operation. When powered, the peripheral device I generates digital signals 3 depending upon its purpose. The peripheral device I may be an instrument arranged to detect some physiological parameter from a monitored patient. More particularly, such physiological data may be an EEG or an ECG signal. Where the peripheral device 1 is designed to monitor physiological data, the device I will typically comprise some appropriate sensor means such as one or more electrodes.
In order to protect the peripheral device 1, or a patient or instrument connected to the device, the device 1 is isolated from the power supply from which the DC power 2 is derived. In Figure 1, the peripheral device 1 is shown connected to a low power isolated source 4 which is in turn coupled to a personal computer 5. Digital data signals 6 are coupled between the power source 4 and the computer 5 via an RS-232 connection comprising RS-232 ports 7,8 provided at the personal computer 5 and at the power source 4, and an RS-232 connecting cable (not shown). Digital data 6 transferred via the RS-232 connection may include measurement signals 9 being transferred from the peripheral device 1 to the computer 5, and control data 10 being transferred from the computer 5 to the peripheral device 1.
The skilled person will appreciate that serial ports such as RS-232 ports are not normally intended to facilitate the transfer of power signals. More particularly, the
RS-232 standard does not allocate pins or lines for the provision of a DC power signal. Under normal circumstances therefore, the power signal required by the peripheral device 1 would be provided via a separate power source connected for example to mains power or to a battery. However, as is illustrated in detail in Figure 2, the low power source 1 proposed here derives a DC power supply signal from the digital data signals 6 sent from the computer 5 over the RS232 connection.
Figure 2 illustrates in more detail the power source 4 of Figure 1. The power source 4 has a switched mode power supply 11 having inputs V+ and V-coupled to certain pins of the RS-232 port 6 of the isolated power source 4. More particularly, RS-232 pins DTR and RTS are coupled to the input V+ via respective diodes D I and D2, whilst RS-232 pin TXD is coupled to the input V-via diode D3. The V+ input of the switched mode power supply is coupled to ground pin SGND via capacitor Cl whilst the V-input is coupled to pin SGND via a capacitor C2. The output of the switched mode power supply is coupled to the input winding 12 of an isolation transformer TI, whilst output winding 13 of the transformer Tl is coupled to DC power supply output pins +ve and-ve of the power source via a rectifying diode D4. A smoothing capacitor C4 is connected across the DC outputs-ve and-ve.
The DC outputs +ve and-ve of the transformer Tl are coupled to the power inputs of the peripheral device 1. Actual data signals 3 are coupled to and from the peripheral device 1 via a pair of optical isolators 16, which ensures isolation of the data signals.
The operation of the isolated power source of Figure 2 will be readily apparent to the skilled person. More particularly, it will be appreciated that the power source 4 is able to convert digital signals provided at the RS-232 port 6 of the source 4 into a DC supply at the DC output pins +ve and-ve. The isolated nature of the source will also be apparent to the skilled person.
Figure 3 illustrates a modification to the isolated power source of Figure I and which is designed to provide a"soft start"mode. In this example, the switched mode power supply 14 is provided by a Maxim Max 634TM integrated circuit. The output voltage of the switched mode power supply 14 is rectified by a diode D5 and smoothed by a smoothing capacitor C5 to provide a DC voltage which is fed back for comparison with a reference voltage in order to regulate the output of the supply 14. If the voltage across the capacitor Cl is less than the voltage drop across a zener diode D6 (as occurs for example during the power-up period), then a diode D7 is forward biased by a pull-down resistor R1, resulting in the switched mode power supply 14 reducing its load current on the capacitor Cl, thus providing a low current soft start.
Figure 4 illustrates an alternative embodiment of the present invention which is similar in principle to that of Figure 2, but in which the isolated power source 4 comprises a USB or an IEEE 1394 interface port 15 for coupling to a USB or
IEEE1394 interface port of a personal computer. There is a trend in the computer industry to provide in particular USB ports as standard on computers and computer devices and the embodiment of Figure 4 aims to provide compatibility for future computers.
It will be appreciated by the person of skill in the art that various modifications may be made to the above described embodiments without departing from the scope of the present invention.
Claims (10)
- Claims 1. A power source for coupling between an input/output data port of a computer and a peripheral device, the power source comprising: a data port arranged in use to be connected to said computer port to receive digital data signals therefrom; output means for coupling to said peripheral device to provide electrical power to the peripheral device; conversion means for converting at least a part of the data signals received from the computer port at said power source data port into an electrical power signal; and isolation means including an isolation barrier, coupled between said conversion means and said output means for transferring power from said power signal from the conversion means to the output means across the isolation barrier.
- 2. A power source according to claim 1, wherein the conversion means of the power source comprises a switched mode power supply.
- 3. A power source according to claim 1 or 2, wherein the isolation barrier of the isolation means is a transformer.
- 4. A power source according to any one of the preceding claims, wherein said data port of the power source is a serial port and is arranged to be coupled to a serial port of a computer.
- 5. A power source according to claim 4, wherein the serial port of the power source is an RS-232 port.
- 6. A power source according to any one of claims I to 3, wherein the data port of the power source is a USB or IEEE 1394 port.
- 7. An interface unit comprising a power source according to any one of the preceding claims, the unit comprising means for transferring digital data signals received from the computer at said data port to the peripheral device.
- 8. An interface device comprising a power source according to any one according to any one of the preceding claims, or according to claim 7, and comprising means for receiving data signals from a peripheral device and for coupling the received data signals to said data port of the power source for transmission to the computer data port.
- 9. Apparatus for monitoring physiological parameters from a patient, the apparatus comprising : monitoring means for attachment to a patient and arranged in use to generate electrical signals corresponding to monitored physiological parameters; and a power source having a data port arranged in use to be connected to a data port of a computer to receive digital data signals therefrom, output means coupled to said monitoring means to provide electrical power to the monitoring means, conversion means for converting at least a part of the digital data signals received from the computer port at the power source data port into an electrical power signal, and isolation means including an isolation barrier, coupled between said conversion means and said output means for transferring power from said power signal, from the conversion means to the output means across the isolation barrier.
- 10. A method of coupling power and digital data signals between a peripheral device and a computer having an input/output data port, the method comprising the steps of : receiving digital data signals from the computer data port ; converting said received digital data signals into a power signal; transferring power from said power signal across an isolation boundary; and providing said transferred power to a peripheral device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9908749A GB2349283A (en) | 1999-04-17 | 1999-04-17 | Isolated power supply for a peripheral device coupled to a computer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9908749A GB2349283A (en) | 1999-04-17 | 1999-04-17 | Isolated power supply for a peripheral device coupled to a computer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9908749D0 GB9908749D0 (en) | 1999-06-09 |
| GB2349283A true GB2349283A (en) | 2000-10-25 |
Family
ID=10851683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9908749A Withdrawn GB2349283A (en) | 1999-04-17 | 1999-04-17 | Isolated power supply for a peripheral device coupled to a computer |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2349283A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2373649A (en) * | 2001-03-19 | 2002-09-25 | Comm Res Lab | Battery power supply with electrically isolated control circuit |
| EP1494124A2 (en) * | 2003-06-30 | 2005-01-05 | Becton Dickinson and Company | Self powered serial-to-serial or USB-to-serial cable with loopback and isolation |
| WO2008104307A1 (en) * | 2007-02-27 | 2008-09-04 | Iprm Intellectual Property Rights Management Ag | Disposable sensor device and monitoring system |
| WO2009012145A1 (en) * | 2007-07-13 | 2009-01-22 | Cleveland Medical Devices Inc. | Method and system for acquiring biosignals in the presence of hf interference |
| CN103349549A (en) * | 2013-07-23 | 2013-10-16 | 上海海神医疗电子仪器有限公司 | Threefold isolation anti-jamming circuit used for electromyogram evoked potential equipment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107273330B (en) * | 2017-08-18 | 2023-05-09 | 安图实验仪器(郑州)有限公司 | Three-wire system serial communication interface isolation circuit module |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2119206A (en) * | 1982-02-26 | 1983-11-09 | Develcon Electronics Ltd | Dataset apparatus |
| US4884287A (en) * | 1988-04-01 | 1989-11-28 | Ncr Corporation | Converter device for interconnecting systems having different communication standards |
| US5267150A (en) * | 1991-08-07 | 1993-11-30 | Medtronic, Inc. | Input isolation circuit for computer-controlled medical device |
| US5381804A (en) * | 1992-10-15 | 1995-01-17 | Aspect Medical Systems, Inc. | Monitor and method for acquiring and processing electrical signals relating to bodily functions |
| EP0710465A1 (en) * | 1994-10-20 | 1996-05-08 | Hewlett-Packard Company | Dynamic control of a patient monitoring system |
| US5519634A (en) * | 1994-06-10 | 1996-05-21 | Melco Inc. | Data transfer unit and method of power supply to the data transfer unit |
| US5581369A (en) * | 1992-09-25 | 1996-12-03 | Ralin, Inc. | Apparatus and method for communicating electrocardiographic data to a facsimile machine |
| US5664204A (en) * | 1993-03-22 | 1997-09-02 | Lichen Wang | Apparatus and method for supplying power and wake-up signal using host port's signal lines of opposite polarities |
| US5848376A (en) * | 1995-08-30 | 1998-12-08 | Trimble Navigation Limited | GPS receiver powered by interface signals |
-
1999
- 1999-04-17 GB GB9908749A patent/GB2349283A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2119206A (en) * | 1982-02-26 | 1983-11-09 | Develcon Electronics Ltd | Dataset apparatus |
| US4884287A (en) * | 1988-04-01 | 1989-11-28 | Ncr Corporation | Converter device for interconnecting systems having different communication standards |
| US5267150A (en) * | 1991-08-07 | 1993-11-30 | Medtronic, Inc. | Input isolation circuit for computer-controlled medical device |
| US5581369A (en) * | 1992-09-25 | 1996-12-03 | Ralin, Inc. | Apparatus and method for communicating electrocardiographic data to a facsimile machine |
| US5381804A (en) * | 1992-10-15 | 1995-01-17 | Aspect Medical Systems, Inc. | Monitor and method for acquiring and processing electrical signals relating to bodily functions |
| US5664204A (en) * | 1993-03-22 | 1997-09-02 | Lichen Wang | Apparatus and method for supplying power and wake-up signal using host port's signal lines of opposite polarities |
| US5519634A (en) * | 1994-06-10 | 1996-05-21 | Melco Inc. | Data transfer unit and method of power supply to the data transfer unit |
| EP0710465A1 (en) * | 1994-10-20 | 1996-05-08 | Hewlett-Packard Company | Dynamic control of a patient monitoring system |
| US5848376A (en) * | 1995-08-30 | 1998-12-08 | Trimble Navigation Limited | GPS receiver powered by interface signals |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2373649A (en) * | 2001-03-19 | 2002-09-25 | Comm Res Lab | Battery power supply with electrically isolated control circuit |
| GB2373649B (en) * | 2001-03-19 | 2005-04-06 | Comm Res Lab | This invention relates to a low-noise battery power supply apparatus |
| EP1494124A2 (en) * | 2003-06-30 | 2005-01-05 | Becton Dickinson and Company | Self powered serial-to-serial or USB-to-serial cable with loopback and isolation |
| JP2005038417A (en) * | 2003-06-30 | 2005-02-10 | Becton Dickinson & Co | Serial-to-serial or usb-to-serial cable with built-in power source having loopback and insulation |
| EP1494124A3 (en) * | 2003-06-30 | 2006-09-06 | Becton Dickinson and Company | Self powered serial-to-serial or USB-to-serial cable with loopback and isolation |
| JP4686141B2 (en) * | 2003-06-30 | 2011-05-18 | ベクトン・ディキンソン・アンド・カンパニー | Built-in serial-serial or USB-serial cable with loopback and insulation |
| US9529762B2 (en) | 2003-06-30 | 2016-12-27 | Becton, Dickinson And Company | Self powered serial-to-serial or USB-to-serial cable with loopback and isolation |
| WO2008104307A1 (en) * | 2007-02-27 | 2008-09-04 | Iprm Intellectual Property Rights Management Ag | Disposable sensor device and monitoring system |
| US8920329B2 (en) | 2007-02-27 | 2014-12-30 | Edwards Lifesciences Iprm Ag | Disposable sensor device and monitoring system with trimming element |
| WO2009012145A1 (en) * | 2007-07-13 | 2009-01-22 | Cleveland Medical Devices Inc. | Method and system for acquiring biosignals in the presence of hf interference |
| US8108039B2 (en) * | 2007-07-13 | 2012-01-31 | Neuro Wave Systems Inc. | Method and system for acquiring biosignals in the presence of HF interference |
| CN103349549A (en) * | 2013-07-23 | 2013-10-16 | 上海海神医疗电子仪器有限公司 | Threefold isolation anti-jamming circuit used for electromyogram evoked potential equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9908749D0 (en) | 1999-06-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |