GB2310570A - Subscriber unit with power supply operable in linear and switched modes; portable radio data packet modem - Google Patents
Subscriber unit with power supply operable in linear and switched modes; portable radio data packet modem Download PDFInfo
- Publication number
- GB2310570A GB2310570A GB9603606A GB9603606A GB2310570A GB 2310570 A GB2310570 A GB 2310570A GB 9603606 A GB9603606 A GB 9603606A GB 9603606 A GB9603606 A GB 9603606A GB 2310570 A GB2310570 A GB 2310570A
- Authority
- GB
- United Kingdom
- Prior art keywords
- power supply
- linear
- subscriber unit
- operational
- supply circuit
- 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.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/563—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices including two stages of regulation at least one of which is output level responsive, e.g. coarse and fine regulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1607—Supply circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Devices For Supply Of Signal Current (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
A subscriber unit, particularly a portable radio data packet modem, has a power supply 11 which operates in a low current linear mode when the unit is receiving, and in a high current switched mode when the unit is transmitting. The power supply thus facilitates both high efficiency transmitter operation with enhanced battery life, and low EMI receiver operation. The supply 11 may be switched between modes by a control 15 in response to a Tx/Rx changeover signal on a line 23, or in response to the increased power required for transmission as sensed by a current sensor 17 or by a power supply temperature sensor 16. The power supply 11 may have separate linear and switched mode sections 13, 14, or a common unit may be operated in either mode according to whether a linear bias or a high frequency bias is applied to a switching transistor (33, Fig.2) in the supply.
Description
SUBSCRIBER UNIT AND METHOD FOR SWITCHING
BETWEEN POWER SUPPLY OPERATIONAL MODES
Field of the Invention
This invention relates to the power supply of subscriber units. The invention is applicable to, but not limited to, a method for switching between operational modes of such a power supply.
Background of the Invention
Subscriber units have at least two operational modes for transmitting and receiving communication signals. The transmitter mode of operation has typically a high current requirement and is relatively insensitive to electromagnetic interference (EMI). The receiver mode of operation has typically a low current requirement and is generally highly sensitive to EMI. Hence, there is a design trade-off when selecting or designing a suitable power supply for a subscriber unit to provide a balance between the transmitter and receiver requirements. Typically, a linear power supply having a low EMI is used.
A disadvantage associated with using a linear power supply is low efficiency resulting in excessive heating of the subscriber unit. The
subscriber unit therefore requires large heat-sinks and causes a problem when implementing linear power supplies in subscriber units having
small dimensions.
Alternatively a switching power supply may be used. A
disadvantage associated with using a switching power supply is the
inherent high EMI effects due to, amongst other factors, the switching
transients of the power supply which decreases the sensitivity of the
subscriber unit when operating in a receiver mode
This invention seeks to provide a power supply arrangement, and
method of operation, to mitigate such problems of subsciber unit power
supplies.
Summarv of the Invention
In a first aspect of the present invention, a method of switching between operational modes of a power supply of a subscriber unit is provided. The method includes the steps of operating the subscriber unit in a receive mode of operation using a linear power supply, switching from the linear power supply to a switched power supply on changing an operational mode of the subscriber unit and operating the subscriber unit in a transmit mode using the switched power supply.
Preferably, the method further includes the steps of monitoring a current level of the power supply and switching to a linear power supply operational mode when the current level decreases below a threshold level when the subscriber unit operates in a receive mode. Subsequently, to switch the power supply to a switched operational mode when the current level increases above the threshold level for transmitter operations.
In a preferred embodiment of the present invention, the power supply is a switched power supply having a bias input. The switched power supply operates in a linear mode of operation when a linear bias is applied to the switched power supply. Preferably, the threshold level includes, for example, an operating temperature of the power supply.
In this manner, a single power supply is used to facilitate both high efficiency transmitter operations and low EMI receiver operations.
In a second aspect of the present invention, a subscriber unit is provided having a power supply circuit including a switching element for switching between at least one of a first low-current linear operational mode and a second high-current non-linear operational mode of the power supply circuit. A linear regulator is provided, operably coupled to the switching element, for operating the power supply circuit in the first lowcurrent linear operational mode and a switched regulator is provided, operably coupled to the switching element, for operating the power supply circuit in the second high-current non-linear operational mode.
In a preferred embodiment of the present invention, the power supply circuit further includes a filter element, operably coupled to the switching element, and at least one sensor element operably coupled to decision element for monitoring operational information of the power supply circuit. Preferably, the at least one sensor element is at least one of the following: a current sense element, a bias voltage sense element and a temperature sense element. The power supply circuit also includes a control element, operably coupled to the switching element, for setting the operational mode of the power supply circuit to at least the first or second operational mode dependent upon the operational information.
In this manner, the first low-current linear operational mode of the power supply circuit is used for receiver operations of the subscriber unit and the second high-current non-linear operational mode of the power supply circuit is used for transmitter operations of the subscriber unit.
In a preferred embodiment of the second aspect of the present invention, the subscriber unit further includes a bias input for controlling an operational mode of the power supply circuit, wherein the power supply circuit operates in a linear mode when a linear bias is applied to the power supply circuit and operates in a non-linear mode when the linear bias is removed.
Advantageously, the efficiency of the power supply of the subscriber unit increases without degradation in the subscriber unit receiver sensitivity. In addition, the battery life of the subscriber unit increases and the temperature of the subscriber unit is controlled, thereby preventing any overheating of the subscriber unit.
A preferred embodiment of the invention will now be described, by way of example only, with reference to the drawings.
Bnef Descrintion of the Drawmgs FIG. 1 is a block diagram of a subscriber unit having a dual operational mode power supply according to a preferred embodiment of the invention.
FIG. 2 is a block diagram of a switched-mode power supply having a bias input for switching the operational mode of the subscriber unit between linear and switched mode operations according to a preferred embodiment of the invention.
FIG. 3 is a flow chart showing a method for switching between operational modes of a power supply according to a preferred embodiment of the invention.
Detailed DescriDtion of the Drawing Referring first to FIG. 1, a block diagram of a subscriber unit with a dual operational mode power supply, according to a preferred embodiment of the invention, is shown. The subscriber unit includes a power source and a power supply circuit operably coupled to the power source. The power supply circuit has a switching element for receiving power from the power source and for switching the power between at least a low-current linear operational mode and a high-current non-linear operational mode of the power supply circuit. The power supply circuit also includes a control element, operably coupled to the switching element, for providing a control signal to the switching element to control an operational mode of the power supply circuit according to operational characteristics of the power supply circuit. Preferably, the power supply circuit includes at least one sensor element, operably coupled to the control element, for monitoring at least one operational characteristic of the power supply circuit and for transmitting the at least one operational characteristic to the control element. The sensor element may be a current sense element, a bias voltage sense element and/or a temperature sense element.
A power source 10 is operably coupled to a power supply circuit 11 that includes a switching element 12, a linear power supply 13, a switched power supply 14, a control unit 15, a current sensor 17, a bias voltage sense element 25 and a temperature sensor 16. The subscriber unit 26 includes a transceiver module 18 having a receiver unit 20, a transmitter unit 21, a transmit I receive (TxIRx) switch 22, an output 24 and a Tx/Rx control line 23 input.
In operation, the power source 10 provides power to the power supply circuit 11. The power supply circuit 11 has two modes of operation, a linear mode of operation and a switched mode of operation. The switching element 12 is operably coupled to the linear power supply 13 for providing a low-current linear operational mode and coupled to the switched power supply 14 for providing a high-current non-linear operational mode of the power supply circuit 11. The low-current linear operational mode of the power supply circuit 11 is used for receiver purposes with the power supply circuit 11 being operably coupled to the receiver unit 20. The high-current non-linear operational mode of the power supply circuit 11 is used for transmitter purposes with the power supply circuit 11 being operably coupled to the receiver unit 20. The control unit 15 controls the operation of the switching element 12 according to information obtained from at least one sensor element, e.g. temperature sensor 16 for measuring the operating temperature of the power supply circuit 11, a current sensor 17 for measuring the current of the power supply 11 and/or bias voltage sense element 25 for sensing the bias voltage of the Tx/Rx control line 23. The
Tx/Rx control line 23 is operably coupled to the Tx/Rs switch 22 and to the control unit 15 via the bias voltage sense element 25. A bias voltage is applied to the Tx/Rx control line 23 and sensed by the bias voltage sense element 25 which transmits a control signal to the control unit 15 to control the operation of the power supply circuit 11 accordingly. The Ts control line 23 also controls the operational mode of the subscriber unit, via the
Tx/Rx switch 22 to operate the subscriber unit 26 in either a transmit or receive operational mode. When the subscriber unit 26 is in receive mode, the receiver unit 20 of the transceiver module 18 is connected to the output 24, the power supply circuit 11 is in linear mode of operation using the linear power supply 13.
Preferably, when say, the current level decreases below a particular threshold level, the control unit 15 switches the power supply circuit 11 to a linear power supply operational mode. When the current level increases above the particular threshold level the control unit 15 switches the power supply circuit 11 to a switched power supply operational mode. A current level above the threshold level indicates a transmit mode of operation of the transceiver module 18 and a current level below the threshold level indicates a receive mode of operation. Alternatively, the control unit 15 switches between the operational modes of the power supply circuit 11 when the temperature of the power supply circuit 11 or bias voltage of Tx/Rs control line 23 crosses a particular temperature or bias level threshold. The linear power supply is operably coupled to the switching element for operating the power supply circuit in a low-current linear operational mode and the switched power supply is operably coupled to the switching element for operating the power supply circuit in a high-current non-linear operational mode. Preferably, the linear power supply is a linear regulator and the switched power supply is a switched regulator.
In the preferred embodiment of the invention, the subscriber unit 26 is a modem for transmission and reception of over-the-air data packets.
Referring now to FIG. 2, a block diagram of a switched-mode power supply of a subscriber unit is provided as an alternative to the dual power supply approach of FIG. 1, where the switched-mode power supply includes a bias control line for switching the operational mode of the subscriber unit between linear and switched mode operations according to a preferred embodiment of the invention. The subscriber unit includes a power source and a power supply circuit operably coupled to the power source. The power supply circuit has a switching element for receiving power from the power source and for switching the power between at least a low-current linear operational mode and a high-current non-linear operational mode of the power supply circuit. The power supply circuit also includes a control element, operably coupled to the switching element, for providing a control signal to the switching element to control an operational mode of the power supply circuit according to operational characteristics of the power supply circuit. Preferably, the control signal is a bias voltage signal input to the switching element from the control element to operate the power supply circuit in a low-current linear operational mode when a linear bias is applied to the switching element and to operate the power supply in a high-current non-linear operational mode when the linear bias is removed. The low-current linear operational mode of the power supply circuit is used for receiver operations of the subscriber unit and the high-current non-linear operational mode of the power supply circuit is used for transmitter operations of the subscriber unit. Preferably, the power supply circuit includes at least one sensor element, operably coupled to the control element, for monitoring at least one operational characteristic of the power supply circuit and for transmitting the at least one operational characteristic to the control element. The sensor element may be a current sense element, a bias voltage sense element and/or a temperature sense element. The subscriber unit includes a switched mode power supply circuit having a filter element operably coupled to an output of the switching element for rectifying and filtering power signals output from the switching element.
A power source 30 is operably coupled to a switched power supply circuit 31 having, a voltage rectifier 32, a switching element 33, a filter element 34, a control element 35. The control element 35 receives signals from a bias input 36 via a bias voltage sense element 44 and/or at least one sensor element, e.g. current sensor 42, temperature sensor 40, for controlling the operational mode of the switched power supply circuit 31 according to the monitored operational characteristics. The at least one sensor elements monitor operational characteristics of the switched power supply circuit 31.
In operation, a power source 30 is operably coupled to a switched power supply circuit 31 and provides an alternating current (AC) to the voltage rectifier 32. The voltage rectifier 32 is optional and is only required when the power source 30 is an AC power source, in order to convert the
AC power to a direct current (DC) input to the switching element 33. When a linear bias is applied to the bias input 36, the control element 35 applies a linear bias to the switching element 33. The switching element 33 outputs a DC voltage to the filter element 34 to operate the switched power supply circuit 31 in a linear mode of operation. This mode would be used in receiver operations of the subscriber unit. When a non-linear bias or a zero bias is applied to the switched power supply circuit 31, the control element 35 applies a high frequency bias voltage, e.g. from 40 KHz to 1 MHz, to the switching element 33. The switching element 33 inputs an high frequency voltage to the filter element 34. The filter element 34 rectifies and filters the high frequency voltage and outputs a DC voltage from the switched power supply output. This mode would be used by the subscriber unit for transmitter operations.
Alternatively to, or in addition to, the bias voltage input, the sensor elements, e.g. current sensor 42 and/or temperature sensor 40, transmit power supply operational characteristics to the control element 35 which are used to control the operational mode of the switched power supply circuit 31 via the switching element 33.
Referring now to FIG. 3, a flow chart describing a method for switching between operational modes of a power supply is shown in accordance with a preferred embodiment of the invention. The method of switching between operational modes of a power supply of a subscriber unit includes operating the subscriber unit in a receive mode of operation using a linear power supply and switching between a linear operational mode and a switched operational mode of the power supply when there is a change of operational mode of the subscriber unit. The subscriber unit subsequently operates in a transmit mode using a switched power supply.
Preferably, the subscriber unit monitors operational characteristics of the power supply and switches to a linear operational mode of the power supply when the operational characteristic decreases below a threshold level and switches to a switched power supply operational mode when the operational characteristic increases above the threshold level. In the preferred embodiment of the invention, a monitored operational characteristic above the threshold level indicates a transmit mode of operation of the subscriber unit and a monitored operational characteristic below the threshold level indicates a receive mode of operation. In addition, in the preferred embodiment of the invention the power supply is a switched power supply having a bias input and to operate the switched power supply in a linear mode of operation, a linear bias is applied to the switched power supply. Operational characteristics used to determine the mode of operation of the power supply include the operating temperature of the power supply, the operating current of the subscriber unit or the power supply and the bias voltage applied to the power supply.
The method of switching between operational modes of a power supply of a communications unit described includes any of the following steps to trigger the switching operation. The method of switching between operational modes of a power supply circuit 11, of a subscriber unit 26, includes setting the subscriber unit 26 to a particular operational mode, as in step 100. At least one of the following sensing elements is used in the control of the operational mode of the subscriber unit.
A current sensor 17 monitors the current consumption of the power supply circuit 11, as shown in step 102. If the current level is monitored such that it passes through a particular current threshold level, as in step 112, the operational mode of the power supply will be changed, as shown in step 114. If the current level is monitored such that it does not pass through the particular current threshold level the operational mode does not change. Typically, a current level above the particular threshold level indicates a transmit mode of operation of the subscriber unit 26 and a current level below the particular threshold level indicates a receive mode of operation.
A temperature sensor 16 monitors the temperature of the power supply circuit 11, as shown in step 104. If the temperature level is monitored such that it passes through a particular temperature threshold level, as in step 110, the operational mode of the power supply will be changed, as shown in step 114. If the temperature level is monitored such that it does not pass through the particular temperature threshold level the operational mode does not change. Typically, a temperature level above the particular threshold level indicates a transmit mode of operation of the subscriber unit 26 and a temperature level below the particular threshold level indicates a receive mode of operation.
A bias voltage sense element 25 monitors the bias voltage supplied to the control unit 15 of the power supply circuit 11, as shown in step 106. If the bias voltage level is monitored such that it passes through a particular bias voltage threshold level, as in step 108, the operational mode of the power supply will be changed, as shown in step 114. If the bias voltage level is monitored such that it does not pass through the particular bias voltage threshold level the operational mode does not change. Typically, a bias voltage level above the particular threshold level or a non-linear bias voltage indicates a transmit mode of operation of the subscriber unit 26 and a bias voltage level below the particular threshold level or a linear bias voltage indicates a receive mode of operation.
The subscriber unit in the preferred embodiment of the invention is a portable radio packet modem (RPM).
Advantageously, the efficiency of the power supply increases without degradation in the RPM receiver sensitivity, the battery life cycle is increases and the temperature of the RPM stays below threshold, prevent overheating of the RPM.
It is within contemplation of the invention that the power source can be an alternating or direct current source, internal or external to the subscriber unit and the linear and switching power supplies may be linear and switching regulators.
Thus a power supply arrangement and method of operation is provided that mitigate the linearity versus efficiency trade-off problems associated with transmitter/ receiver operational modes of a subscriber unit's power supply.
Claims (14)
1. A method of switching between operational modes of a power supply of a subscriber unit, the method comprising the steps of:
operating the subscriber unit in a receive mode of operation using a linear power supply;
switching between a linear operational mode and a switched operational mode of the power supply when there is a change of operational mode of the subscriber unit; and
operating the subscriber unit in a transmit mode using a switched power supply.
2. The method of switching between operational modes of a power supply of a subscriber unit according to claim 1, the method further comprising the steps of:
monitoring an operational characteristic of the power supply;
switching to a linear operational mode of the power supply when the operational characteristic decreases below a threshold level; and
switching to a switched power supply operational mode when the operational characteristic increases above the threshold level.
3. The method of switching between operational modes of a power supply according to claim 2, wherein a monitored operational characteristic above the threshold level indicates a transmit mode of operation of the subscriber unit and a monitored operational characteristic below the threshold level indicates a receive mode of operation.
4. The method of switching between operational modes of a power supply according to any of the preceding claims, wherein
the power supply is a switched power supply having a bias input and
the switched power supply operates in a linear mode of operation when a linear bias is applied to the switched power supply.
5. The method of switching between operational modes of a power supply according to any of claims 2 to 4, wherein the operational characteristic includes at least one of the following:
an operating temperature of the power supply;
an operating current of the subscriber unit or the power supply; and
a bias voltage applied to the power supply.
6. A subscriber unit comprising:
a power source;
a power supply circuit operably coupled to the power source, the power supply circuit having:
a switching element for receiving power from the power source and for switching the power between at least a low-current linear operational mode and a high-current non-linear operational mode of the power supply circuit; and
a control element operably coupled to the switching element for providing a control signal to the switching element to control an operational mode of the power supply circuit according to operational characteristics of the power supply circuit.
7. The subscriber unit of claim 6, wherein the power supply circuit further comprises:
at least one sensor element operably coupled to the control element for monitoring at least one operational characteristic of the power supply circuit and for transmitting the at least one operational characteristic to the control element.
8. The subscriber unit of claims 6 or 7, wherein the at least one sensor element is at least one of the following:
a current sense element;
a bias voltage sense element; and
a temperature sense element.
9. The subscriber unit of any of claims 6 to 8, wherein the power supply circuit further comprises:
a linear power supply operably coupled to the switching element for operating the power supply circuit in the low-current linear operational mode; and
a switched power supply operably coupled to the switching element for operating the power supply circuit in the high-current non-linear operational mode.
10. The subscriber unit of claim 9 wherein the linear power supply is a linear regulator and the switched power supply is a switched regulator.
11. The subscriber unit of claims 6 to 8, wherein the power supply circuit is a switched mode power supply circuit, the power supply circuit further comprising:
a filter element operably coupled to an output of the switching element for rectifying and filtering power signals output from the switching element; and
where the control signal is a bias voltage signal input to the switching element from the control element to operate the power supply circuit in a low-current linear operational mode when a linear bias is applied to the switching element and to operate the power supply in a highcurrent non-linear operational mode when the linear bias is removed.
12. The subscriber unit of claims 9 to 11, wherein the low-current linear operational mode of the power supply circuit is used for receiver operations of the subscriber unit and the high-current non-linear operational mode of the power supply circuit is used for transmitter operations of the subscriber unit.
13. The subscriber unit of any of claims 6 to 12, wherein the subscriber unit is a modem for transmission and reception of over-the-air data packets.
14. A power supply of a subscriber unit substantially as described herein with respect to FIG. 2 of the drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9603606A GB2310570A (en) | 1996-02-21 | 1996-02-21 | Subscriber unit with power supply operable in linear and switched modes; portable radio data packet modem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9603606A GB2310570A (en) | 1996-02-21 | 1996-02-21 | Subscriber unit with power supply operable in linear and switched modes; portable radio data packet modem |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9603606D0 GB9603606D0 (en) | 1996-04-17 |
| GB2310570A true GB2310570A (en) | 1997-08-27 |
Family
ID=10789113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9603606A Withdrawn GB2310570A (en) | 1996-02-21 | 1996-02-21 | Subscriber unit with power supply operable in linear and switched modes; portable radio data packet modem |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2310570A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2328844A (en) * | 1997-09-02 | 1999-03-03 | Nec Technologies | Portable appliance power supply |
| FR2768527A1 (en) * | 1997-09-18 | 1999-03-19 | Sgs Thomson Microelectronics | VOLTAGE REGULATOR |
| EP0949739A2 (en) * | 1998-04-10 | 1999-10-13 | Matsushita Electric Industrial Co., Ltd. | Power supply apparatus |
| WO2000057567A1 (en) * | 1999-03-23 | 2000-09-28 | Siemens Aktiengesellschaft | Synchronous load doubler-charge pump with an integrated in-phase regulator |
| WO2002027905A1 (en) * | 2000-09-28 | 2002-04-04 | Citizen Watch Co., Ltd. | Power supply |
| EP1199789A1 (en) * | 2000-10-19 | 2002-04-24 | Semiconductor Components Industries, LLC | Circuit and method of operating a low-noise, on-demand regulator in switched or linear mode |
| US6441591B2 (en) | 2000-03-17 | 2002-08-27 | Nokia Mobile Phones Ltd. | Linear regulator with conditional switched mode preregulation |
| EP1239574A2 (en) * | 2001-03-07 | 2002-09-11 | Fujitsu Limited | DC-DC converter, power supply circuit, and method for controlling the same |
| WO2004049145A1 (en) * | 2002-11-27 | 2004-06-10 | Sierra Wireless, Inc. | Adaptive current limiter for wireless modem |
| DE102006045902A1 (en) * | 2006-09-28 | 2008-04-03 | Infineon Technologies Ag | Integrated semiconductor component has function block, and power control unit which produce supply voltage from input voltage, and frequency spectrum is adjusted in dependence of actual operating condition |
| EP1681760A3 (en) * | 2005-01-18 | 2008-04-23 | Micrel, Inc. | Dual mode buck regulator with improved transition between LDO and PWM operation |
| WO2009058138A1 (en) * | 2007-10-31 | 2009-05-07 | Agere Systems Inc. | Temperature-based switched-mode power supply |
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| US5502369A (en) * | 1991-10-01 | 1996-03-26 | Mitsubishi Denki Kabushiki Kaisha | Stabilized direct current power supply |
| US5406150A (en) * | 1992-08-24 | 1995-04-11 | Silicon Systems Inc | Control system for motors and inductive loads |
| US5414341A (en) * | 1993-12-07 | 1995-05-09 | Benchmarq Microelectronics, Inc. | DC-DC converter operable in an asyncronous or syncronous or linear mode |
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|---|---|---|---|---|
| GB2328844A (en) * | 1997-09-02 | 1999-03-03 | Nec Technologies | Portable appliance power supply |
| GB2328844B (en) * | 1997-09-02 | 2002-03-27 | Nec Technologies | Power supply for use in a portable appliance |
| US6150798A (en) * | 1997-09-18 | 2000-11-21 | Stmicroelectronics S.A. | Voltage regulator |
| FR2768527A1 (en) * | 1997-09-18 | 1999-03-19 | Sgs Thomson Microelectronics | VOLTAGE REGULATOR |
| EP0903839A1 (en) * | 1997-09-18 | 1999-03-24 | STMicroelectronics SA | Voltage regulator |
| EP0949739A2 (en) * | 1998-04-10 | 1999-10-13 | Matsushita Electric Industrial Co., Ltd. | Power supply apparatus |
| WO2000057567A1 (en) * | 1999-03-23 | 2000-09-28 | Siemens Aktiengesellschaft | Synchronous load doubler-charge pump with an integrated in-phase regulator |
| US6462523B1 (en) | 1999-03-23 | 2002-10-08 | Siemens Aktiengesellschaft | Load-synchronous doppler charge pump with an integrated series-path regulator |
| US6441591B2 (en) | 2000-03-17 | 2002-08-27 | Nokia Mobile Phones Ltd. | Linear regulator with conditional switched mode preregulation |
| WO2002027905A1 (en) * | 2000-09-28 | 2002-04-04 | Citizen Watch Co., Ltd. | Power supply |
| US6815935B2 (en) | 2000-09-28 | 2004-11-09 | Citizen Watch Co., Ltd. | Power supply |
| EP1199789A1 (en) * | 2000-10-19 | 2002-04-24 | Semiconductor Components Industries, LLC | Circuit and method of operating a low-noise, on-demand regulator in switched or linear mode |
| US6452368B1 (en) | 2000-10-19 | 2002-09-17 | Semiconductor Components Industries Llc | Circuit and method of operating a low-noise, on-demand regulator in switched or linear mode |
| EP1239574A2 (en) * | 2001-03-07 | 2002-09-11 | Fujitsu Limited | DC-DC converter, power supply circuit, and method for controlling the same |
| EP1239574A3 (en) * | 2001-03-07 | 2005-06-22 | Fujitsu Limited | DC-DC converter, power supply circuit, and method for controlling the same |
| WO2004049145A1 (en) * | 2002-11-27 | 2004-06-10 | Sierra Wireless, Inc. | Adaptive current limiter for wireless modem |
| US7106569B2 (en) | 2002-11-27 | 2006-09-12 | Sierra Wireless, Inc. | Adaptive current limiter for wireless modem |
| CN100388160C (en) * | 2002-11-27 | 2008-05-14 | 施克莱无线公司 | Adaptive current limiter for wireless modem |
| US7586724B2 (en) | 2002-11-27 | 2009-09-08 | Sierra Wireless, Inc. | Adaptive current limiter for wireless modem |
| EP1681760A3 (en) * | 2005-01-18 | 2008-04-23 | Micrel, Inc. | Dual mode buck regulator with improved transition between LDO and PWM operation |
| DE102006045902A1 (en) * | 2006-09-28 | 2008-04-03 | Infineon Technologies Ag | Integrated semiconductor component has function block, and power control unit which produce supply voltage from input voltage, and frequency spectrum is adjusted in dependence of actual operating condition |
| US7755336B2 (en) | 2006-09-28 | 2010-07-13 | Infineon Technologies Ag | Integrated semiconductor component and method for controlling a supply voltage of a functional circuit in an integrated semiconductor component |
| WO2009058138A1 (en) * | 2007-10-31 | 2009-05-07 | Agere Systems Inc. | Temperature-based switched-mode power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9603606D0 (en) | 1996-04-17 |
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| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |