US20050040793A1 - Capacitance charge device with adjustable clamping voltage - Google Patents
Capacitance charge device with adjustable clamping voltage Download PDFInfo
- Publication number
- US20050040793A1 US20050040793A1 US10/644,837 US64483703A US2005040793A1 US 20050040793 A1 US20050040793 A1 US 20050040793A1 US 64483703 A US64483703 A US 64483703A US 2005040793 A1 US2005040793 A1 US 2005040793A1
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- capacitance
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- clamping
- power supply
- battery
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- 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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
Definitions
- the invention relates to a capacitance charge device that is applied to a power system of a portable electronic product and, more particularly, to a capacitance charge device with adjustable clamping voltage capable of clamping the battery voltage so that the voltage will not have a tremendous drop instantaneously when the battery is charging the high-farad capacitance.
- a battery 10 As shown in FIG. 1 , will be connected in series to a high-capacity capacitance 12 in a power system to prolong a battery's lifespan.
- the capacity of the capacitance 12 often lies between 1 and 10 farad.
- the battery 10 When the capacity of the capacitance 12 is at zero, the battery 10 will rapidly charge the high-farad capacitance 12 instantaneously and therefore cause the voltage of battery 10 to drop in large amount. In turn, the dropping of the voltage will affect not only the lifespan of the battery, but also the normal running of the system, and if the system is down, the electronic product will fail to function normally.
- a conventional solution is to add in a current limiting resistor connected in series between the battery 10 and the capacitance 12 in order that the resistor 14 can refrain the battery 10 from rapid discharging and thus improve the problem of the battery's tremendous voltage drop. Nevertheless, the lifespan of the battery 10 will still be affected by the natural consumption of the resistor 14 .
- the invention provides a capacitance charge device with adjustable clamping voltage to solve the above-mentioned problems.
- the main and first object of the invention is to provide a capacitance charge device with adjustable clamping voltage capable of clamping the battery voltage so that the battery voltage will not have a tremendous drop instantaneously when the battery is charging the high-farad capacitance so as to prevent the system from being down as well as to ensure the normal functioning of the electronic product.
- the second object of the invention is to provide a capacitance charge device that its clamping voltage is adjustable according to the variations in product design.
- the third object of the invention is to provide a capacitance charge device with adjustable clamping voltage capable of prolonging the lifespan of a battery.
- the fourth object of the invention is to provide a capacitance charge device with adjustable clamping voltage suitable for any kind of battery designed for charging the high-farad capacitance.
- a capacitance charge device with adjustable clamping voltage includes a high-farad capacitance; a power supply device for charging the high-farad capacitance; a switch device connected between the power supply device and the high-farad capacitance in order that through the on/off operations of the switch, the on/off conductions between the power supply device and the high-farad capacitance can be controlled; and a clamping circuit provided between the switch device and the high-farad capacitance and also connected to the output terminal of the power supply device; besides, the clamping circuit has a clamping voltage, which can be compared with the actual voltage so as to control the on/off operations of the switch device and in turn control the on/off conductions between the power supply device and the capacitance.
- FIG. 1 is a schematic diagram showing circuit design of a conventional capacitance charge device.
- FIG. 2 is a schematic diagram showing another circuit design of a conventional capacitance charge device.
- FIG. 3 is a schematic diagram showing circuit design of the capacitance charge device of the invention.
- FIG. 4 and FIG. 5 are schematic diagrams showing two different embodiments of application circuit designs of the capacitance charge device of the invention.
- the invention utilizes a Zener Diode that its voltage is able to keep a constant value in spite of sharp current change when the Zener Diode is encountering a breakdown during a reverse bias operation.
- a clamping circuit is formed in accordance with other components such as resistors and transistors so as to achieve an effect of clamping the battery voltage. Therefore, the voltage can avoid from dropping too drastically and therefore resulting in system down. Hence, the electronic product can be ensured to function normally.
- FIG. 3 is a schematic diagram showing circuit design of the capacitance charge device of the invention.
- the capacitance charge device of the invention firstly includes a high-farad capacitance 20 , whose capacity usually lies between 1 and 10 farad, and a power supply device that is usually a battery 22 connected to the capacitance 20 for charging the high-farad capacitance 20 .
- a switch device 24 is connected between the battery 22 and the capacitance 20 , and through on/off operations of the switch, the on/off conductions between the battery 22 and the capacitance 20 can be controlled.
- a clamping circuit 26 is connected between the switch device 24 and the capacitance 20 , and the clamping circuit 26 is also connected to the output terminal of the battery 22 .
- the clamping circuit 26 has a clamping voltage, which is also referred as a reference voltage and can be compared with the actual voltage so as to control the on/off operations of the switch device 24 for facilitating the control of on/off conductions between the battery 22 and the capacitance 20 .
- the clamping voltage is adjustable according to the variations in product design, and usually it has at least 1.8 volts.
- the switch device 24 controlled by the clamping circuit 26 When the actual voltage is higher than the clamping voltage, the switch device 24 controlled by the clamping circuit 26 will be opened, allowing the battery 22 and the capacitance 20 to be conductive for a charge from the battery 22 to the capacitance 20 . Conversely, when the actual voltage is lower than the clamping voltage, the switch device 24 controlled by the clamping circuit 26 will be closed for turning off the conduction between the battery 22 and the capacitance 20 .
- the switch device 24 in this embodiment is a transistor
- the clamping circuit 26 is composed of a Zener Diode Z 1 , a transistor Q 1 , and resistors R 1 , R 2 , and R 3 .
- the battery 22 When the capacity of the capacitance 20 is at zero, the battery 22 will charge the capacitance 20 ; consequently, the voltage of the battery 22 will go down.
- the clamping circuit 26 will maintain the control of the switch device 24 to be open, allowing conduction between the battery 22 and the capacitance 20 for a charging operation.
- the Zener Diode On the contrary, if the actual voltage is lower than the clamping voltage, the Zener Diode will become conductive due to breakdown, allowing the switch device 24 to be closed and conduction between the battery 22 and the capacitance 20 to be turned off. Therefore, the electric potential of the battery 22 will no longer go down.
- the switch device 24 will then be opened again, allowing the battery 22 and the capacitance 20 to be conductive for charging operation between the two.
- the clamping circuit 26 will constrain the electric potential of the battery 22 in the clamping voltage and thus the confined voltage will not have a tremendous drop instantaneously.
- the dropping of the electric potential of the battery 22 will not be effective enough to shutdown the system. Therefore, the electronic product can be assured to function normally and the lifespan of the battery 22 can be prolonged as well.
- FIG. 5 is another embodiment showing another application circuit design of the invention.
- the switch device 24 is a comparator, and a transistor Q 2 functioning as a switch is connected between the output terminal of the comparator and the capacitance 20 .
- the clamping circuit 26 is composed of a Zener Diode Z 2 and resistors R 4 , R 5 , and R 6 .
- the principle and method of the clamping operation between the clamping circuit 26 and the battery 22 are the same as those of described in the FIG. 4 , they will not be reiterated here.
- the capacitance charge device with adjustable clamping voltage provided by the invention can be applied to the power system of a portable electronic product, such as a digital camera, mobile phone, notebook computer, or personal digital assistance.
- the invention utilizes a clamping circuit whose main component is Zener Diode for charging a high-farad capacitance.
- the battery voltage will not have a tremendous drop instantaneously when the battery is charging the high-farad capacitance. Therefore, the invention can achieve clamping the battery voltage so as to prevent the system from being down instantaneously as well as to ensure normal functioning of the electronic product. Meanwhile, the lifespan of the battery can be prolonged as well.
- the clamping voltage is adjustable according to various designs of electronic products. Therefore, the capacitance charge device provided by the invention has the advantage of being suitable for any kind of battery designed for charging the high-farad capacitance.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
- 1. Field of the Invention
- The invention relates to a capacitance charge device that is applied to a power system of a portable electronic product and, more particularly, to a capacitance charge device with adjustable clamping voltage capable of clamping the battery voltage so that the voltage will not have a tremendous drop instantaneously when the battery is charging the high-farad capacitance.
- 2. Description of the Related Art
- With development of the information industry, many portable electronic products, such as a mobile phone, notebook computer, personal digital assistance (PDA), and digital camera, have been applied in daily life for different purposes such as video/audio multimedia communications and information network transmissions.
- On the other hand, low working voltage has been a developing trend pursued by electronic products. Usually, a
battery 10, as shown inFIG. 1 , will be connected in series to a high-capacity capacitance 12 in a power system to prolong a battery's lifespan. The capacity of thecapacitance 12 often lies between 1 and 10 farad. When the capacity of thecapacitance 12 is at zero, thebattery 10 will rapidly charge the high-farad capacitance 12 instantaneously and therefore cause the voltage ofbattery 10 to drop in large amount. In turn, the dropping of the voltage will affect not only the lifespan of the battery, but also the normal running of the system, and if the system is down, the electronic product will fail to function normally. - To cope with the problem, as shown in
FIG. 2 , a conventional solution is to add in a current limiting resistor connected in series between thebattery 10 and thecapacitance 12 in order that theresistor 14 can refrain thebattery 10 from rapid discharging and thus improve the problem of the battery's tremendous voltage drop. Nevertheless, the lifespan of thebattery 10 will still be affected by the natural consumption of theresistor 14. - Therefore, the invention provides a capacitance charge device with adjustable clamping voltage to solve the above-mentioned problems.
- The main and first object of the invention is to provide a capacitance charge device with adjustable clamping voltage capable of clamping the battery voltage so that the battery voltage will not have a tremendous drop instantaneously when the battery is charging the high-farad capacitance so as to prevent the system from being down as well as to ensure the normal functioning of the electronic product.
- The second object of the invention is to provide a capacitance charge device that its clamping voltage is adjustable according to the variations in product design.
- The third object of the invention is to provide a capacitance charge device with adjustable clamping voltage capable of prolonging the lifespan of a battery.
- The fourth object of the invention is to provide a capacitance charge device with adjustable clamping voltage suitable for any kind of battery designed for charging the high-farad capacitance.
- According to the invention, a capacitance charge device with adjustable clamping voltage includes a high-farad capacitance; a power supply device for charging the high-farad capacitance; a switch device connected between the power supply device and the high-farad capacitance in order that through the on/off operations of the switch, the on/off conductions between the power supply device and the high-farad capacitance can be controlled; and a clamping circuit provided between the switch device and the high-farad capacitance and also connected to the output terminal of the power supply device; besides, the clamping circuit has a clamping voltage, which can be compared with the actual voltage so as to control the on/off operations of the switch device and in turn control the on/off conductions between the power supply device and the capacitance.
- The objects and technical contents of the invention will be better understood through the description of the following embodiments with reference to the drawings.
-
FIG. 1 is a schematic diagram showing circuit design of a conventional capacitance charge device. -
FIG. 2 is a schematic diagram showing another circuit design of a conventional capacitance charge device. -
FIG. 3 is a schematic diagram showing circuit design of the capacitance charge device of the invention. -
FIG. 4 andFIG. 5 are schematic diagrams showing two different embodiments of application circuit designs of the capacitance charge device of the invention. - The invention utilizes a Zener Diode that its voltage is able to keep a constant value in spite of sharp current change when the Zener Diode is encountering a breakdown during a reverse bias operation. Next, a clamping circuit is formed in accordance with other components such as resistors and transistors so as to achieve an effect of clamping the battery voltage. Therefore, the voltage can avoid from dropping too drastically and therefore resulting in system down. Hence, the electronic product can be ensured to function normally.
-
FIG. 3 is a schematic diagram showing circuit design of the capacitance charge device of the invention. As shown inFIG. 3 , the capacitance charge device of the invention firstly includes a high-farad capacitance 20, whose capacity usually lies between 1 and 10 farad, and a power supply device that is usually abattery 22 connected to thecapacitance 20 for charging the high-farad capacitance 20. Secondly, aswitch device 24 is connected between thebattery 22 and thecapacitance 20, and through on/off operations of the switch, the on/off conductions between thebattery 22 and thecapacitance 20 can be controlled. Thirdly, aclamping circuit 26 is connected between theswitch device 24 and thecapacitance 20, and theclamping circuit 26 is also connected to the output terminal of thebattery 22. Besides, theclamping circuit 26 has a clamping voltage, which is also referred as a reference voltage and can be compared with the actual voltage so as to control the on/off operations of theswitch device 24 for facilitating the control of on/off conductions between thebattery 22 and thecapacitance 20. In addition, the clamping voltage is adjustable according to the variations in product design, and usually it has at least 1.8 volts. When the actual voltage is higher than the clamping voltage, theswitch device 24 controlled by theclamping circuit 26 will be opened, allowing thebattery 22 and thecapacitance 20 to be conductive for a charge from thebattery 22 to thecapacitance 20. Conversely, when the actual voltage is lower than the clamping voltage, theswitch device 24 controlled by theclamping circuit 26 will be closed for turning off the conduction between thebattery 22 and thecapacitance 20. - To illustrate the relation between the
clamping circuit 26 and thebattery 22, two embodiments are shown inFIG. 4 andFIG. 5 for illustrating two different application circuit designs of the invention as well as for the function of theclamping circuit 26. First, as shown inFIG. 4 , theswitch device 24 in this embodiment is a transistor, and theclamping circuit 26 is composed of a Zener Diode Z1, a transistor Q1, and resistors R1, R2, and R3. - When the capacity of the
capacitance 20 is at zero, thebattery 22 will charge thecapacitance 20; consequently, the voltage of thebattery 22 will go down. During the initial charging process, the actual voltage will be higher than the clamping voltage provided by theclamping circuit 26 since thebattery 22 is still at its beginning stage of discharge. Therefore, theclamping circuit 26 will maintain the control of theswitch device 24 to be open, allowing conduction between thebattery 22 and thecapacitance 20 for a charging operation. On the contrary, if the actual voltage is lower than the clamping voltage, the Zener Diode will become conductive due to breakdown, allowing theswitch device 24 to be closed and conduction between thebattery 22 and thecapacitance 20 to be turned off. Therefore, the electric potential of thebattery 22 will no longer go down. Afterwards, when the actual voltage is running up again until it is higher than the clamping voltage, theswitch device 24 will then be opened again, allowing thebattery 22 and thecapacitance 20 to be conductive for charging operation between the two. As a result, through the aforementioned clamping operation, theclamping circuit 26 will constrain the electric potential of thebattery 22 in the clamping voltage and thus the confined voltage will not have a tremendous drop instantaneously. In turn, the dropping of the electric potential of thebattery 22 will not be effective enough to shutdown the system. Therefore, the electronic product can be assured to function normally and the lifespan of thebattery 22 can be prolonged as well. - Furthermore,
FIG. 5 is another embodiment showing another application circuit design of the invention. In this embodiment, theswitch device 24 is a comparator, and a transistor Q2 functioning as a switch is connected between the output terminal of the comparator and thecapacitance 20. Besides, theclamping circuit 26 is composed of a Zener Diode Z2 and resistors R4, R5, and R6. As for the clamping operation, since the principle and method of the clamping operation between theclamping circuit 26 and thebattery 22 are the same as those of described in theFIG. 4 , they will not be reiterated here. - Thus, the capacitance charge device with adjustable clamping voltage provided by the invention can be applied to the power system of a portable electronic product, such as a digital camera, mobile phone, notebook computer, or personal digital assistance.
- In conclusion, the invention utilizes a clamping circuit whose main component is Zener Diode for charging a high-farad capacitance. During the charging process, the battery voltage will not have a tremendous drop instantaneously when the battery is charging the high-farad capacitance. Therefore, the invention can achieve clamping the battery voltage so as to prevent the system from being down instantaneously as well as to ensure normal functioning of the electronic product. Meanwhile, the lifespan of the battery can be prolonged as well. Moreover, the clamping voltage is adjustable according to various designs of electronic products. Therefore, the capacitance charge device provided by the invention has the advantage of being suitable for any kind of battery designed for charging the high-farad capacitance.
- The description above intends to explain the features of this invention by an implementation example. The purpose is to let persons skilled in the art can understand the contents of this invention and implement by it. However, this does not mean to limit the claims of this invention. Therefore, all equivalent substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims.
Claims (9)
Priority Applications (1)
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US10/644,837 US6853166B1 (en) | 2003-08-21 | 2003-08-21 | Capacitance charge device with adjustable clamping voltage |
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US10/644,837 US6853166B1 (en) | 2003-08-21 | 2003-08-21 | Capacitance charge device with adjustable clamping voltage |
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US6853166B1 US6853166B1 (en) | 2005-02-08 |
US20050040793A1 true US20050040793A1 (en) | 2005-02-24 |
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US10/644,837 Expired - Lifetime US6853166B1 (en) | 2003-08-21 | 2003-08-21 | Capacitance charge device with adjustable clamping voltage |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101807812A (en) * | 2010-04-23 | 2010-08-18 | 张伟 | Buffer-type charging system and method for metering charge capacity thereof |
CN102163855A (en) * | 2010-02-23 | 2011-08-24 | 马克西姆综合产品公司 | Novel circuit topology for regulating power from low capacity battery cells |
US20160064957A1 (en) * | 2014-08-29 | 2016-03-03 | Fairchild Semiconductor Corporation | Optimized charging apparatus and methods |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5412557A (en) * | 1992-10-14 | 1995-05-02 | Electronic Power Conditioning, Inc. | Unipolar series resonant converter |
US5852558A (en) * | 1997-06-20 | 1998-12-22 | Wisconsin Alumni Research Foundation | Method and apparatus for reducing common mode voltage in multi-phase power converters |
-
2003
- 2003-08-21 US US10/644,837 patent/US6853166B1/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5412557A (en) * | 1992-10-14 | 1995-05-02 | Electronic Power Conditioning, Inc. | Unipolar series resonant converter |
US5852558A (en) * | 1997-06-20 | 1998-12-22 | Wisconsin Alumni Research Foundation | Method and apparatus for reducing common mode voltage in multi-phase power converters |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102163855A (en) * | 2010-02-23 | 2011-08-24 | 马克西姆综合产品公司 | Novel circuit topology for regulating power from low capacity battery cells |
US20110204855A1 (en) * | 2010-02-23 | 2011-08-25 | Maxim Integrated Products, Inc. | Circuit topology for regulating power from low capacity battery cells |
US9054549B2 (en) * | 2010-02-23 | 2015-06-09 | Maxim Integrated Products, Inc. | Circuit topology for regulating power from low capacity battery cells |
CN101807812A (en) * | 2010-04-23 | 2010-08-18 | 张伟 | Buffer-type charging system and method for metering charge capacity thereof |
US20160064957A1 (en) * | 2014-08-29 | 2016-03-03 | Fairchild Semiconductor Corporation | Optimized charging apparatus and methods |
US10090695B2 (en) * | 2014-08-29 | 2018-10-02 | Fairchild Semiconductor Corporation | Optimized current pulse charging apparatus and method employing increasing clamp reference voltages and decreasing current pulses |
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US6853166B1 (en) | 2005-02-08 |
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