GB2192102A - Battery protection and charging unit - Google Patents
Battery protection and charging unit Download PDFInfo
- Publication number
- GB2192102A GB2192102A GB08615800A GB8615800A GB2192102A GB 2192102 A GB2192102 A GB 2192102A GB 08615800 A GB08615800 A GB 08615800A GB 8615800 A GB8615800 A GB 8615800A GB 2192102 A GB2192102 A GB 2192102A
- Authority
- GB
- United Kingdom
- Prior art keywords
- battery
- protection unit
- battery protection
- housing
- load
- 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- Withdrawn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
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00308—Overvoltage protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
- H02J7/0049—Detection of fully charged condition
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A rechargeable battery power pack comprises a discharge protection circuit 17 wherein when the battery voltage falls below a first predetermined level, a Zener diode ZO2 and a transistor TR1 cause conduction whereby a transistor TR2 turns on to energise a warning light LED3 and a relay coil L1 causing a load 18 to be disconnected from the battery 14 and a warning buzzer 24 to be activated. A battery charging circuit 15, 16 charges the battery from a mains supply 10 via a thyristor SCR1. When the battery voltage rises to a second predetermined level, a thyristor SRC2 turns on to energise a lamp LED2 and prevent triggering of the charging thyristor SCR1. The battery 14, charging circuit 15, 16 and protection circuit 17 are contained in a housing (30), (Fig. 3), which has a reversible plug 31 which in one position opens a switch SW1 between the battery and charging circuit, and in a second position closes the switch SW1 and exposes plug pins 34 for connection to the mains supply 10. <IMAGE>
Description
SPECIFICATION
Battery Protection Unit
The present invention relates to a battery protection unit and particuiarly but not exclusively to a battery protection unit for use in portable electrical apparatus, such as, interalia, toys and audio and video equipment.
Some rechargeable batteries possess the drawback that if they are allowed to discharge excessively before being recharged their capacity to hold charge deteriorates. This applies, for example, to maintenance free sealed lead-acid batteries which are becoming more commonly employed in toys and other portable electrical apparatus because they are comparatively inexpensive and have a high capacity.
The present invention seeks to provide a battery protection unit which mitigates the aforesaid drawback.
According to the present invention there is provided a battery protection unit for a rechargeable battery, said battery having terminals for connection to a load, wherein said protection unit comprises first sensing means for sensing the output terminal voltage of a said battery, and first disconnecting means for electrically disconnecting said battery from said load in response to the sensed voltage falling below a first predetermined value.
Preferably, the battery protection unit includes warning means for alerting the battery user that the battery terminal output voltage has fallen below said first predetermined value.
Preferably, the unit includes means for charging the battery from an a.c. mains supply.
Advantageously, the unit further includes second disconnecting means for electrically disconnecting the battery terminals from the charging means in response to the sensed voltage exceeding a second predetermined value.
Preferably the unit incorporates a battery, preferably of the sealed lead-acid type.
Preferably the unit is contained in a single housing to which a power plug for connection to a mains power supply is releasably attached. The housing together with the plug attached thereto is preferably of cuboidal shape, and is preferably made of electrically insulating material and of sealed construction.
The invention will be further described by way of example, with reference to the accompanying drawings, in which:
Figure lisa schematic block diagram of one embodiment of the battery protection unit according to the present invention;
Figure 2 is a circuit diagram of the unit shown in
Figure 1; and
Figure 3 is a perspective view of the housing of the unit shown in Figure 1.
Referring to Figure 1 of the drawings, the battery protection unit shown therein comprises a power plug 10 for connection to a mains power supply, a transformer 11, a primary winding 12 of which is connected to the power plug 10, for stepping down the mains supply voltage to a lower voltage suitable for charging, a re-chargeable battery 14, a charging circuit 15, which includes the transformer and which is connected to the battery 14, a charging protection circuit 16, a load 18 connected to output terminals of the power pack and a discharge protection circuit 17 connected between battery 14 and the output terminals. A warning device, e.g. a buzzer 24 is provided to alert a user when circuit 17 operates.
Referring to Figure 2, which shows the circuit in more detail, power plug 10 is connected to primary winding 12 of step-down transformer 11 and its secondary winding 13 is connected to a.c. input terminals 20 of a rectifier bridge 19.
Charging circuit 15 comprises the rectifier bridge 19, a light emitting diode LED1, resistors R1 and R2, a diode D1 and a silicon controlled rectifier SCR1.
The cathode 22 of the rectifier bridge 19 is connected to a reference point or earth 26.
The light emitting diode LED1 is connected in series with the resistor R1 across cathode 22 and anode 21 of the rectifier bridge 19. The anode of the silicon controlled rectifier SCR1 is connected to its gate terminal via resistor R2 and a diode D1 connected in series. The cathode of the silicon controlled rectifier SCR1 is connected to the positive terminal of battery 14 via a switch SWl,and the negative terminal of the battery 14 is connected to earth.
When the power plug 10 is connected to a mains power supply, the a.c. voltage produced in the secondary winding 13 of the transformer 11 is rectified by rectifier bridge 19 to produce a pulsating d.c. voltage which is applied across the light emitting diode LED1 to provide a visual indication that charging is taking place.
During the charging operation, switch SW1 should be closed in order to connect the positive terminal of the battery 14 to the cathode of silicon controlled rectifier SCR1. Switch SW1 is operated in connection with the operation of the plug 10, and will be described hereinafter.
During the charging operation, the peak value of the pulsating d.c. voltage is higher than the d.c.
terminal voltage of battery 14, and diode D7 is forwardly biased during each pulsating cycle of the charging voltage.
Therefore silicon controlled rectifier SCR1 is turned on during each said cycle by gate triggering, and the battery 14 is charged. At the end of each charging cycle, the silicon controlled rectifier SCR1 is reversely biased and turned off, and the battery 14 is effectively disconnected from the charging circuit 15.
The charging protection circuit 16 comprises a light emitting diode LED2, a silicon controlled rectifier SCR2, resistors R3 and R4, zener diode ZD1 and variable potential divider VR1.
The junction A between resistor R2 and the diode D1 is connected to earth 26 via the light emitting diode LED2 and the silicon controlled rectifier SCR2 connected in series, the cathode of the diode LED2 being connected to the anode of silicon controlled rectifier SCR2. The gate terminal of the silicon controlled rectifier SCR2 is connected to earth 26 via a resistor R4, and is directly connected to the anode of the zener diode ZD1. The cathode of the zener diode ZD1 is connected to the movable contact 31 of the potential dividerVR1, which is connected in series with a resistor R3, between the cathode of silicon controlled rectifierSCR1 and earth 26.
Potential dividerVR1 together with resistor R3 act as a voltage sensor for sensing the terminal voltage of battery 14. It provides a potential difference across the movable contact 31 and earth 26 in direct proportion to the battery terminal voltage. During the course of charging, the battery terminal voltage increases and approaches its nominal value at which the battery 14 is fully charged. At this instant the potential difference across the movable contact 31 and earth 26 will be just adequate to exceed the operating voltage of the zener diode ZD1, and the zener diode ZDl conducts. The variable potential divider VR1 is provided to give a potential difference across its movable contact 31 and earth 26 which corresponds to the nominal operating voltage of battery 14.When zener diode ZD1 conducts the gate terminal of the silicon controlled rectifier SCR2 receives a current pulse and rectifier SCR2 is thereby turned on by gate triggering. At this instant junction A is caused to be substantially at earth potential by means of conduction of light emitting diode LED2 and silicon controlled rectifier SCR2.
As described above, during the charging operation silicon controlled rectifier SCR1 is turned on and off alternately depending on the difference in magnitude between the pulsating d.c. charging voltage and the battery terminal voltage. Now under the condition of zero potential at junction A, silicon controlled rectifier SCR1 cannot be turned on again when the pulsating d.c. charging voltage next exceeds the battery terminal voltage because diode D1 can no longer be forwardly biased to provide a triggering pulse to the gate terminal.
At the end of the charging operation, light emitting diode LED2 conducts as aforementioned and thereby gives a visual indication thereof.
Resistor R4 is used to provide a path to divert any unpredictable breakdown surge current from the gate terminal of the silicon controlled rectifier SCR2 to protect the rectifier SCR2 from damage.
The discharge protection circuit 17 comprises relay 23, diode D2, transistors TR1 and TR2, zener diode ZD2, light emitting diode LED3, resistors R5,
R6 and R7, and buzzer 24. Switch SW2 is a manually operated master switch connected between the positive terminal of the battery 14 and the discharging protection circuit 17 at a junction B, as shown. Itis used to disconnect the battery 14 from circuit 17 to avoid power consumption when the power pack is not in use.
Load 18 is connected across junction B and earth 26 via a pair of N.C. (normally-closed) contacts 27 and 28 of relay 23. The pole contact 28 of relay 23 is connected to junction B. A buzzer 24 is connected across the N.O. (normally-open) contact 29 of relay 23 and earth 26.
The base of transistor TR1 is connector to point B via resistor R5 and zener diode ZD2 connected in series, the cathode of zener diode ZD2 being connected to junction B. The emitter of transistor
TR1 is connected to earth 26, and its collector is connected to junction B and the base of transistor
TR2 via resistors R6 and R7 respectively.
The emitteroftransistorTR2 is connected to earth 26, and its collector is connected to junction B via light emitting diode LED3 and the operating coil L7 of relay 23 connected in series, the cathode of light emitting diode LED3 being connected to the collector of transistor TR2. A diode D2 is connected in parallel with the coil L1 with its anode connected to junction B.
When the master switch SW2 is closed, the load 18 is connected across the battery 14 and supplied with power therefrom.
In operation with the battery 14 fully charged, the battery terminal voltage at the early stage of discharge should remain substantially constant, this voltage being such that the zener diode ZD2 conducts. The base-emitter junction of transistor
TR1 is thus forwardly biased, and transistor TR1 is turned on bringing its collector terminal to substantially earth potential. This also brings the base of transistor TR2 to substantially earth potential. Consequently transistor TR2 is off and no current flows through the operating coil L1 of the relay 23.
Eventuaily, the battery terminal voltage begins to drop, and when it drops to a predetermined level zener diode ZD2 ceases to conduct. Transistor TR1 is turned off as its base-emitter junction is no longer forwardly biased. This brings the collector terminal of transistor TR1 up to the battery terminal voltage.
Hence the base-emitter junction oftransistorTR2 is forwardly biased, and transistors TR2 is turned on.
Now current starts to flow through the operating coil L1 of relay 23 and the light emitting diode LED3 conducts to provide a visual indication of excessive battery discharge. The operating coil L1 is preferably highly inductive so that the relay operating current can only buiid up gradually. After a certain interval of time has elapsed, the relay operating current reaches a level at which the relay 23 operates to close contacts 28 and 29. The buzzer 24 is therefore energised to provide an audio warning signal to alert a user that the battery 14 should be recharged. At the same instant, the pair of relay contacts 27 and 28 are opened and the load 18 is disconnected from the battery 14to prevent excessive discharge of the battery.
Diode D2 is used to eliminate any back emf induced across the relay coil terminals during switching. This will avoid contact bouncing and ensure a well defined relay switching operation.
Referring now to Figure 3, the power pack as shown comprises a housing 30 having a lid 32 sealed thereto and a removable plug 31. The plug 31 has two plug terminals 34 and two through sockets 37, connected electrically to the two terminals 34, respectively. The housing 30 has a plug receiving recess 33, two terminals 36 connected to the primary winding 12 of the transformer 11 (see
Figures 1 and 2) and apertures 35 for receiving the two plug terminals 34, respectively. Switch SW1 (referred to above) is in the form of a microswitch and is mounted in the housing 30 adjacent to one of the apertures 35.
During normal operation of the power pack the plug 31 is mounted in the recess 33 with the plug terminals 34 extending through apertures 35 and terminals 36 housed in the sockets 37. One of the terminals 34 contacts the operating member of switch SW1 to hold the latter open.
When it is necessary to recharge the power pack the plug 31 is inverted so that the plug terminals 34 can be connected to a mains supply, the terminals 34 being connected to the transformer via sockets 37 and terminals 36. In this position the operating member of the switch SW1 is released and switch
SW1 closes automatically.
The plug 31 is shaped to correspond to the shape of the recess 33 so that the housing 30 and plug 31 together have a cuboidal shape with for example dimensions of approximately 17 cms x 4 cms x 6 cms.
Output terminals 39 of the power pack are mounted on the housing lid 32 for connection to the load 18, and three apertures 40 are provided for the three light emitting diodes LED1, LED2 and LED3, and one aperture 41 is provided for the master switch SW2.
The housing 30 will contain the charging circuit 15, including transformer 11, the battery 14, the charging protection circuit 16 and discharge protection circuit 17.
The above embodiment is given by way of example only and many modifications could be made without departing from the scope of the invention. For example, there may be more than one battery. The term battery as used herein also includes a single cell.
Claims (15)
1.A A battery protection unit for a rechargeable battery, said battery having terminals for connection to a load, wherein said protection unit comprises first sensing means for sensing the output terminal voltage of a said battery, and first disconnecting means for electrically disconnecting said battery from said load in response to the sensed voltage falling below a first predetermined value.
2. A battery protection unit as claimed in claim 1, further comprising a charging circuit including a transformer and rectifier means for charging the battery from an a.c. mains supply.
3. A battery protection unit as claimed in claim 2, further including second sensing means and second disconnecting means for electrically disconnecting the battery terminals from the charging circuit in response to the second sensing means sensing that the voltage exceeds a second predetermined value.
4. A battery protection unit as claimed in claims 1, 2 or 3, including warning means for alerting the battery user that the battery terminal output voltage has fallen below said first predetermined value.
5. A battery protection unit as claimed in any one of claims 1 to 4, further comprising a said battery.
6. A battery protection unit as claimed in claim 5, wherein the battery is a sealed lead-acid battery.
7. A battery protection unit as claimed in claim 5 or 6, wherein said unit comprises a pair of load output terminals for electrical connection to a said load, said battery terminals being electrically connected to said load output terminals, and said first disconnection means electrically disconnecting a said battery terminal from the respective load output terminal.
8. A battery protection unit as claimed in claim 5,6 or 7, wherein the unit is contained in a single housing.
9. A battery protection unit as claimed in claim 8, wherein the housing is made of electrically insulating material and is of sealed construction.
10. A battery protection unit as claimed in claim 8 or claim 9, wherein a power plug for connection to an a.c. mains power supply is releasably attached to the housing.
11. A battery protection unit as claimed in claim
10, wherein the housing together with the plug, when the latter is attached to the housing, is of cuboidal shape.
12. A battery protection unit as claimed in claim
11, wherein the dimensions of the housing are substantially 17 cms x 4 cms x 6 cms.
13. A battery protection unit as claimed in any one of claims 5 to 12, further comprising a manually operable switch for electrically disconnecting the
battery from the load.
14. A battery protection unit as claimed in claim
13, wherein the manually operable switch also
electrically disconnects the battery from the first disconnecting means and the said first sensing
means.
15. A battery protection unit substantially as
hereinbefore described with reference to the
accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08615800A GB2192102A (en) | 1986-06-27 | 1986-06-27 | Battery protection and charging unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08615800A GB2192102A (en) | 1986-06-27 | 1986-06-27 | Battery protection and charging unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8615800D0 GB8615800D0 (en) | 1986-08-06 |
| GB2192102A true GB2192102A (en) | 1987-12-31 |
Family
ID=10600235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08615800A Withdrawn GB2192102A (en) | 1986-06-27 | 1986-06-27 | Battery protection and charging unit |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2192102A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989011748A1 (en) * | 1988-05-20 | 1989-11-30 | Matson Automotive Industries Pty. Ltd. | Voltage controlling and indicating device |
| WO1991006130A1 (en) * | 1989-10-11 | 1991-05-02 | Alan Roy Cooke | Portable power supplies |
| EP0433605A2 (en) * | 1989-11-20 | 1991-06-26 | Hagenuk Gmbh | Power supply, especially for telecommunication systems |
| GB2245781A (en) * | 1990-06-29 | 1992-01-08 | Wu Ko Lee | A device for controlling charging of a battery and displaying charge level |
| GB2246252A (en) * | 1990-06-13 | 1992-01-22 | Allan George Pocock | Rechargeable battery management modules |
| EP0585021A2 (en) * | 1992-08-18 | 1994-03-02 | Black & Decker Inc. | Improvements in battery operated electric machines |
| WO1999056374A1 (en) * | 1998-04-15 | 1999-11-04 | Tyco Electronics Corporation | Protection systems for rechargeable elements |
| US6331763B1 (en) | 1998-04-15 | 2001-12-18 | Tyco Electronics Corporation | Devices and methods for protection of rechargeable elements |
| EP1411614A1 (en) * | 2002-10-17 | 2004-04-21 | C.E.I.N. s.r.l. | Miniature LED lamp with rechargeable cell |
| GB2470968A (en) * | 2009-06-09 | 2010-12-15 | Kerio Technologies Inc | Power supply protective terminal |
| US8729851B2 (en) | 2007-01-12 | 2014-05-20 | Koehler-Bright Star, Inc. | Battery pack for miner's cap lamp with charging and discharging control module |
| CN110165723A (en) * | 2018-06-25 | 2019-08-23 | 北京机电工程研究所 | Power supply for dummy round |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1098477A (en) * | 1965-06-15 | 1968-01-10 | Electroloid Ltd | Voltage indicating devices |
| GB1148931A (en) * | 1966-01-14 | 1969-04-16 | Eaton Yale & Towne | Battery discharge indicating system for use in an industrial truck |
| GB1186500A (en) * | 1968-03-07 | 1970-04-02 | Kiepe Bahn Electrik G M B H | Improvements in Electrical Circuits |
| US3648145A (en) * | 1970-05-08 | 1972-03-07 | Singer Co | Undervoltage protection device |
| US3708738A (en) * | 1970-12-22 | 1973-01-02 | Frezzolini Electronics Inc | Battery charging and discharging apparatus |
| US4150302A (en) * | 1977-04-25 | 1979-04-17 | Roche Thomas F | Emergency light battery charger circuit |
| GB2008871A (en) * | 1977-11-21 | 1979-06-06 | Esb Int Corp | Auxiliary lighting systems associated with an alarm system |
| GB2047594A (en) * | 1979-03-26 | 1980-12-03 | Pace Inc | A portable electronics repair system |
| GB2142487A (en) * | 1982-11-27 | 1985-01-16 | Lin Min Shin | Protective circuit system for emergency light |
| US4595872A (en) * | 1983-09-28 | 1986-06-17 | Ball Newton E | Computer-attached uninterruptable DC power supply |
-
1986
- 1986-06-27 GB GB08615800A patent/GB2192102A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1098477A (en) * | 1965-06-15 | 1968-01-10 | Electroloid Ltd | Voltage indicating devices |
| GB1148931A (en) * | 1966-01-14 | 1969-04-16 | Eaton Yale & Towne | Battery discharge indicating system for use in an industrial truck |
| GB1186500A (en) * | 1968-03-07 | 1970-04-02 | Kiepe Bahn Electrik G M B H | Improvements in Electrical Circuits |
| US3648145A (en) * | 1970-05-08 | 1972-03-07 | Singer Co | Undervoltage protection device |
| US3708738A (en) * | 1970-12-22 | 1973-01-02 | Frezzolini Electronics Inc | Battery charging and discharging apparatus |
| US4150302A (en) * | 1977-04-25 | 1979-04-17 | Roche Thomas F | Emergency light battery charger circuit |
| GB2008871A (en) * | 1977-11-21 | 1979-06-06 | Esb Int Corp | Auxiliary lighting systems associated with an alarm system |
| GB2047594A (en) * | 1979-03-26 | 1980-12-03 | Pace Inc | A portable electronics repair system |
| GB2142487A (en) * | 1982-11-27 | 1985-01-16 | Lin Min Shin | Protective circuit system for emergency light |
| US4595872A (en) * | 1983-09-28 | 1986-06-17 | Ball Newton E | Computer-attached uninterruptable DC power supply |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989011748A1 (en) * | 1988-05-20 | 1989-11-30 | Matson Automotive Industries Pty. Ltd. | Voltage controlling and indicating device |
| US5343135A (en) * | 1988-05-20 | 1994-08-30 | Matson Automotive Industries Pty Ltd | Voltage limiting and indicating device |
| GB2253513A (en) * | 1989-10-11 | 1992-09-09 | Alan Roy Cooke | Portable power supplies |
| WO1991006130A1 (en) * | 1989-10-11 | 1991-05-02 | Alan Roy Cooke | Portable power supplies |
| GB2253513B (en) * | 1989-10-11 | 1994-06-22 | Alan Roy Cooke | Portable power supplies |
| EP0433605A2 (en) * | 1989-11-20 | 1991-06-26 | Hagenuk Gmbh | Power supply, especially for telecommunication systems |
| EP0433605A3 (en) * | 1989-11-20 | 1992-11-04 | Hagenuk Gmbh | Power supply, especially for telecommunication systems |
| GB2246252A (en) * | 1990-06-13 | 1992-01-22 | Allan George Pocock | Rechargeable battery management modules |
| GB2246252B (en) * | 1990-06-13 | 1994-09-21 | Allan George Pocock | Rechargeable battery management modules |
| GB2245781A (en) * | 1990-06-29 | 1992-01-08 | Wu Ko Lee | A device for controlling charging of a battery and displaying charge level |
| EP0585021A2 (en) * | 1992-08-18 | 1994-03-02 | Black & Decker Inc. | Improvements in battery operated electric machines |
| EP0585021A3 (en) * | 1992-08-18 | 1994-05-18 | Black & Decker Inc. | Improvements in battery operated electric machines |
| US5490370A (en) * | 1992-08-18 | 1996-02-13 | Black & Decker Inc. | Battery operated electric machines |
| WO1999056374A1 (en) * | 1998-04-15 | 1999-11-04 | Tyco Electronics Corporation | Protection systems for rechargeable elements |
| US6331763B1 (en) | 1998-04-15 | 2001-12-18 | Tyco Electronics Corporation | Devices and methods for protection of rechargeable elements |
| US6914416B2 (en) | 1998-04-15 | 2005-07-05 | Tyco Electronics Corporation | Electrical device including a voltage regulator mounted on a variable resistor |
| EP1411614A1 (en) * | 2002-10-17 | 2004-04-21 | C.E.I.N. s.r.l. | Miniature LED lamp with rechargeable cell |
| US8729851B2 (en) | 2007-01-12 | 2014-05-20 | Koehler-Bright Star, Inc. | Battery pack for miner's cap lamp with charging and discharging control module |
| US8922159B2 (en) | 2007-01-12 | 2014-12-30 | Koehler-Bright Star, Inc. | Battery pack for powering miner's cap lamp |
| US9362762B2 (en) | 2007-01-12 | 2016-06-07 | Koehler-Bright Star LLC | Battery pack and cap lamp system |
| GB2470968A (en) * | 2009-06-09 | 2010-12-15 | Kerio Technologies Inc | Power supply protective terminal |
| CN110165723A (en) * | 2018-06-25 | 2019-08-23 | 北京机电工程研究所 | Power supply for dummy round |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8615800D0 (en) | 1986-08-06 |
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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) |