US20040135561A1 - Energy storage circuitry system - Google Patents
Energy storage circuitry system Download PDFInfo
- Publication number
- US20040135561A1 US20040135561A1 US10/340,622 US34062203A US2004135561A1 US 20040135561 A1 US20040135561 A1 US 20040135561A1 US 34062203 A US34062203 A US 34062203A US 2004135561 A1 US2004135561 A1 US 2004135561A1
- Authority
- US
- United States
- Prior art keywords
- voltage
- energy storage
- storage element
- circuit
- energy
- 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.)
- Granted
Links
Images
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
- H02M1/36—Means for starting or stopping converters
-
- 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
Definitions
- the invention relates to an energy storage circuitry system and, more specifically to a circuitry system capable of accumulating electrical energy from a power source having insufficient power to meet the electrical power requirements of a load until sufficient power is stored to achieve a predetermined value for the load so as to reduce energy loss upon supply of power from a power supply system to the load.
- the invention permits the efficient use of relatively weak or intermittent power sources.
- an object of the invention is to provide an energy storage circuitry system capable of accumulating a small electric energy until sufficient energy has been stored to supply to the load efficiently.
- the energy loss of the power supply system to the load can be reduced.
- an energy storage circuitry system comprising an energy storage element for accumulating small amounts of electrical energy from the power supply system, a voltage boosting circuit for regulating a switching frequency of the storage element input based on a feedback voltage from the energy storage element to control input of energy to the energy storage element, a comparison circuit for comparing the voltage in the energy storage element with a reference voltage to detect if the voltage in the energy storage element has achieved a predetermined value sufficient to efficiently supply the load and generate a control signal upon detection that the predetermined value has been reached, and a charging circuit for supplying power to the load in response to the control signal when the voltage in the energy storage element is detected to achieve the predetermined value.
- the voltage boosting circuit regulates the switching frequency of the input from the power supply in a PFM (pulse frequency modulation) manner.
- the present invention can obtain the following effects:
- FIG. 1 is a block diagram showing a schematic structure of a energy storage circuitry system in accordance with the invention
- FIG. 2 is a schematic drawing showing a schematic structure of a voltage boosting circuit in accordance with the invention.
- FIGS. 3 ( a ) and 3 ( b ) are schematic drawing showing an equivalent circuit and waveform of the voltage booting circuit of FIG. 2;
- FIG. 4 is a schematic diagram showing a control circuit in accordance with the invention.
- FIG. 5 is a schematic diagram showing a schematic structure of a charging circuit in accordance with the invention.
- FIG. 1 is a block diagram of a schematic structure of an energy storage circuitry system in accordance with the invention.
- the energy storage system comprises a voltage boosting circuit 1 , a comparison circuit 2 , a charging circuit 3 , and an energy storage element 4 .
- the voltage boosting circuit 1 is used for regulating a switching frequency of an input voltage V in from a power supply system and for storing the input voltage in the energy storage element 4 .
- the energy storage element 4 is not restricted to the capacitor shown in the drawing and can be any energy storage element such as a battery or the like.
- the comparison circuit 2 is used for comparing the voltage in the energy storage element with a reference voltage and releasing the energy when a predetermined voltage is detected in the energy storage element 4 .
- the comparison circuit 2 may generate a control signal to control the energy release to the load. As soon as energy is released, the comparison circuit 2 will simultaneously return to a state for detecting the energy storage.
- the charging circuit 3 is used for supplying for the load in response to the control signal as soon as the voltage in the energy storage element 4 is detected to achieve the predetermined voltage value.
- FIG. 2 shows a schematically structural diagram of the voltage boosting circuit 1 in accordance with the invention
- FIGS. 3 ( a ) and 3 ( b ) shows an equivalent circuit and waveform for the voltage boosting circuit 1 of FIG. 2.
- U 1 shown in FIG. 2 is a PFM (pulse-frequency modulation) controlled IC for regulating and stabilizing voltage supplied to the storage element 4 .
- IC U 1 employs a voltage controlled oscillation (VCO) circuit to drive an N-channel MOSFET to compare the voltage in the energy storage element with an internal reference voltage for regulating the switching frequency of the MOSFET. This causes the MOSFET to output frequency modulation pulses to stabilize the output voltage.
- VCO voltage controlled oscillation
- the N-channel MOSFET can be driven by a small voltage and current and may achieve a higher efficiency in the switching circuit for boosting voltage to obtain a stable output voltage.
- the PFM When power is supplied, the PFM generates an oscillating frequency at SW as follows: when the MOSFET turns on, the input current I in energizes an inductor L (L 1 in FIG. 2) and stores the energy in the inductor L. When the MOSFET turns off. The energy in the inductor L will release and generate current I d to accompany a discharge current of a capacitor (C 2 in FIG. 2) to charge the energy storage element 4 for providing to a load.
- the switching frequency is a key factor for determining the output voltage. Therefore, when the input V in is connected to the power supply system, if the supplied voltage is higher that the predetermined voltage for U 1 , the internal feedback circuit will compare the voltage of the energy element 4 with the predetermined voltage.
- the comparator U 2 A in FIG. 4
- the switching frequency will be the highest oscillating frequency.
- FIG. 4 shows a schematic structural diagram for the control circuit 2 in accordance with the invention.
- the control circuit 2 mainly detects whether the stored energy can be released to supply the load, and builds up a voltage of the stored energy on a resistor R 1 and a diode D 9 to provide a stable voltage source.
- the resistors R 2 , R 3 , R 4 divide the input into two different reference voltages, which are respectively supplied to the negative input terminals of comparators U 2 A and U 2 B.
- the resistors R 13 , R 14 also provide a predetermined voltage value.
- Diodes D 3 , D 7 form an OR gate and diodes D 5 , D 6 form an AND gate.
- the function of the AND gate is to judge if the stored voltage in the energy storage is higher than the two reference voltages.
- the AND gate turns MOSFET Q 2 on.
- the gate turns Q 1 on such that the output of U 3 C is changed to a low voltage because the collector and emitter of Q 1 are grounded. At this time, MOSFET Q 2 turns off to stop charging the rechargeable product.
- FIG. 5 shows a schematic structural diagram of the charging circuit 3 in accordance with the invention.
- the operation of the charging circuit 3 is generally the same as that of the voltage boosting circuit 1 . That is to say, the charging circuit 3 acts as a further voltage boosting converter which utilizes IC U 3 D to form an oscillator to cause MOSFET Q 3 to turn on through the amplification of the transistor Q 4 .
- MOSFET Q 3 turns on, current flows through the inductor L 2 to ground and the inductor L 2 can store the energy.
- MOSFET Q 3 turns off, the inductor L 2 releases the energy through diode D 10 to charge the output capacitor C 4 for the load.
- Diode D 10 supplies a feedback signal to the input of IC U 3 D through resistor R 24 to control the stabilization of the output voltage.
- the circuit of the invention may be applied to a generator system that generates energy in response to intermittent vibrations or motion, providing a stable output no matter how irregular the vibrations or motion that causes generating of power.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
- 1. Field of the Invention
- The invention relates to an energy storage circuitry system and, more specifically to a circuitry system capable of accumulating electrical energy from a power source having insufficient power to meet the electrical power requirements of a load until sufficient power is stored to achieve a predetermined value for the load so as to reduce energy loss upon supply of power from a power supply system to the load. The invention permits the efficient use of relatively weak or intermittent power sources.
- 2. Related Technology of the Invention
- Generally, when a power supply system generates electrical energy to supply to the load, the generated power is required to achieve a predetermined value. However, when the power generated by the power supply system does not achieve the predetermined value, then much of the generated electrical energy is wasted because the generated electrical energy cannot effectively supply the load.
- Therefore, it is necessary to develop a circuitry system capable of allowing the small electrical energy that is generated by the power supply system and does not achieve a predetermined value, to be accumulated for release to the load upon the achievement of the predetermined value.
- With a view to the above problem, an object of the invention is to provide an energy storage circuitry system capable of accumulating a small electric energy until sufficient energy has been stored to supply to the load efficiently. Thus, the energy loss of the power supply system to the load can be reduced.
- For achieving the above object, according to one aspect of the invention, an energy storage circuitry system is provided, comprising an energy storage element for accumulating small amounts of electrical energy from the power supply system, a voltage boosting circuit for regulating a switching frequency of the storage element input based on a feedback voltage from the energy storage element to control input of energy to the energy storage element, a comparison circuit for comparing the voltage in the energy storage element with a reference voltage to detect if the voltage in the energy storage element has achieved a predetermined value sufficient to efficiently supply the load and generate a control signal upon detection that the predetermined value has been reached, and a charging circuit for supplying power to the load in response to the control signal when the voltage in the energy storage element is detected to achieve the predetermined value.
- Further, according to a preferred embodiment, the voltage boosting circuit regulates the switching frequency of the input from the power supply in a PFM (pulse frequency modulation) manner.
- Thus, the present invention can obtain the following effects:
- 1. accumulating a small amount of electrical energy until a predetermined value to meet the requirement of a load is achieved; and
- 2. reducing the energy loss of the power supply system.
- FIG. 1 is a block diagram showing a schematic structure of a energy storage circuitry system in accordance with the invention;
- FIG. 2 is a schematic drawing showing a schematic structure of a voltage boosting circuit in accordance with the invention;
- FIGS.3(a) and 3(b) are schematic drawing showing an equivalent circuit and waveform of the voltage booting circuit of FIG. 2;
- FIG. 4 is a schematic diagram showing a control circuit in accordance with the invention; and
- FIG. 5 is a schematic diagram showing a schematic structure of a charging circuit in accordance with the invention.
- FIG. 1 is a block diagram of a schematic structure of an energy storage circuitry system in accordance with the invention. The energy storage system comprises a
voltage boosting circuit 1, acomparison circuit 2, acharging circuit 3, and anenergy storage element 4. Thevoltage boosting circuit 1 is used for regulating a switching frequency of an input voltage Vin from a power supply system and for storing the input voltage in theenergy storage element 4. It will be appreciated that theenergy storage element 4 is not restricted to the capacitor shown in the drawing and can be any energy storage element such as a battery or the like. Thecomparison circuit 2 is used for comparing the voltage in the energy storage element with a reference voltage and releasing the energy when a predetermined voltage is detected in theenergy storage element 4. When the voltage achieves the predetermined voltage, thecomparison circuit 2 may generate a control signal to control the energy release to the load. As soon as energy is released, thecomparison circuit 2 will simultaneously return to a state for detecting the energy storage. Thecharging circuit 3 is used for supplying for the load in response to the control signal as soon as the voltage in theenergy storage element 4 is detected to achieve the predetermined voltage value. - FIG. 2 shows a schematically structural diagram of the
voltage boosting circuit 1 in accordance with the invention, and FIGS. 3(a) and 3(b) shows an equivalent circuit and waveform for thevoltage boosting circuit 1 of FIG. 2. - U1 shown in FIG. 2 is a PFM (pulse-frequency modulation) controlled IC for regulating and stabilizing voltage supplied to the
storage element 4. As shown in FIG. 3(a) IC U1 employs a voltage controlled oscillation (VCO) circuit to drive an N-channel MOSFET to compare the voltage in the energy storage element with an internal reference voltage for regulating the switching frequency of the MOSFET. This causes the MOSFET to output frequency modulation pulses to stabilize the output voltage. The N-channel MOSFET can be driven by a small voltage and current and may achieve a higher efficiency in the switching circuit for boosting voltage to obtain a stable output voltage. When power is supplied, the PFM generates an oscillating frequency at SW as follows: when the MOSFET turns on, the input current Iin energizes an inductor L (L1 in FIG. 2) and stores the energy in the inductor L. When the MOSFET turns off. The energy in the inductor L will release and generate current Id to accompany a discharge current of a capacitor (C2 in FIG. 2) to charge theenergy storage element 4 for providing to a load. Thus, the switching frequency is a key factor for determining the output voltage. Therefore, when the input Vin is connected to the power supply system, if the supplied voltage is higher that the predetermined voltage for U1, the internal feedback circuit will compare the voltage of theenergy element 4 with the predetermined voltage. If the voltage of theenergy storage element 4 is lower than the preset reference voltage, this indicates that the output voltage of the energy storage element has not achieved a predetermined voltage. Based on the switching frequency, the comparator (U2A in FIG. 4) will generate a control signal which controls whether to raise the voltage in the energy storage element. Due to the lower internal resistance, when thecircuit 1 is used to charge theenergy storage element 4, the switching frequency will be the highest oscillating frequency. - FIG. 4 shows a schematic structural diagram for the
control circuit 2 in accordance with the invention. Thecontrol circuit 2 mainly detects whether the stored energy can be released to supply the load, and builds up a voltage of the stored energy on a resistor R1 and a diode D9 to provide a stable voltage source. The resistors R2, R3, R4 divide the input into two different reference voltages, which are respectively supplied to the negative input terminals of comparators U2A and U2B. The resistors R13, R14 also provide a predetermined voltage value. Diodes D3, D7 form an OR gate and diodes D5, D6 form an AND gate. The function of the AND gate is to judge if the stored voltage in the energy storage is higher than the two reference voltages. When the stored voltage is higher than H-Vref, the AND gate turns MOSFET Q2 on. When the outputs of U2A, U2B are lower than H-Vref, the gate turns Q1 on such that the output of U3C is changed to a low voltage because the collector and emitter of Q1 are grounded. At this time, MOSFET Q2 turns off to stop charging the rechargeable product. - FIG. 5 shows a schematic structural diagram of the
charging circuit 3 in accordance with the invention. The operation of thecharging circuit 3 is generally the same as that of thevoltage boosting circuit 1. That is to say, thecharging circuit 3 acts as a further voltage boosting converter which utilizes IC U3D to form an oscillator to cause MOSFET Q3 to turn on through the amplification of the transistor Q4. When MOSFET Q3 turns on, current flows through the inductor L2 to ground and the inductor L2 can store the energy. When MOSFET Q3 turns off, the inductor L2 releases the energy through diode D10 to charge the output capacitor C4 for the load. Diode D10 supplies a feedback signal to the input of IC U3D through resistor R24 to control the stabilization of the output voltage. - Summing up the foregoing, the invention can effectively realize the following targets:
- 1. increasing the present energy storage efficiency.
- 2. decreasing the circuit size of the energy storage circuit.
- By way of example, the circuit of the invention may be applied to a generator system that generates energy in response to intermittent vibrations or motion, providing a stable output no matter how irregular the vibrations or motion that causes generating of power.
- Having described a preferred exemplary example of the invention, however, it will be appreciated that the example is not intended to be the limit of the invention. It is noted that modifications and variations can be made by persons skilled in the art in light of the above teachings. It is therefore to be understood that various changes, equivalences and modifications may be made in the particular example of the invention without departing from the scope and spirit of the invention as outlined by the appended claims.
-
-
-
-
Claims (3)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW092100563A TWI268035B (en) | 2003-01-10 | 2003-01-10 | Energy storage circuitry system |
US10/340,622 US6765375B1 (en) | 2003-01-10 | 2003-01-13 | Energy storage circuitry system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW092100563A TWI268035B (en) | 2003-01-10 | 2003-01-10 | Energy storage circuitry system |
US10/340,622 US6765375B1 (en) | 2003-01-10 | 2003-01-13 | Energy storage circuitry system |
Publications (2)
Publication Number | Publication Date |
---|---|
US20040135561A1 true US20040135561A1 (en) | 2004-07-15 |
US6765375B1 US6765375B1 (en) | 2004-07-20 |
Family
ID=50856523
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/340,622 Expired - Fee Related US6765375B1 (en) | 2003-01-10 | 2003-01-13 | Energy storage circuitry system |
Country Status (2)
Country | Link |
---|---|
US (1) | US6765375B1 (en) |
TW (1) | TWI268035B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108112149A (en) * | 2017-12-26 | 2018-06-01 | 生迪智慧科技有限公司 | Power supply control apparatus and lamps and lanterns |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7180277B2 (en) * | 2004-04-09 | 2007-02-20 | Maxwell Technologies, Inc. | Capacitor start-up apparatus and method with fail safe short circuit protection |
JP4363457B2 (en) * | 2007-05-01 | 2009-11-11 | ヤマハ株式会社 | Power control device, speaker device, and power control method |
US9543834B2 (en) * | 2013-04-26 | 2017-01-10 | Fujitsu Ten Limited | Switching regulator, electronic device, and electronic circuit |
Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US568044A (en) * | 1896-09-22 | Brake- beam | ||
US4614899A (en) * | 1983-07-08 | 1986-09-30 | Data Ray Corporation | Voltage regulator for pulsed voltage power supplies |
US4614889A (en) * | 1984-04-18 | 1986-09-30 | Mitsubishi Denki Kabushiki Kaisha | Charging dynamoelectric machine having reduced noise output |
US5422562A (en) * | 1994-01-19 | 1995-06-06 | Unitrode Corporation | Switching regulator with improved Dynamic response |
US5568044A (en) * | 1994-09-27 | 1996-10-22 | Micrel, Inc. | Voltage regulator that operates in either PWM or PFM mode |
US5831394A (en) * | 1995-12-21 | 1998-11-03 | Patent-Treuhand-Gesellschaft Fur Elektrische Gluehlampen Mbh | Circuit arrangement for the production of voltage pulse sequences, in particular for the operation of dielectrically impeded discharges |
US5889392A (en) * | 1997-03-06 | 1999-03-30 | Maxim Integrated Products, Inc. | Switch-mode regulators and methods providing transient response speed-up |
US6011382A (en) * | 1998-10-01 | 2000-01-04 | Toko, Inc. | Circuit and method for directly regulating the output voltage of an electroluminescent lamp driver |
US6172494B1 (en) * | 1999-02-23 | 2001-01-09 | U.S. Philips Corporation | Circuit arrangement for delivering a supply current |
US6323600B1 (en) * | 1997-07-22 | 2001-11-27 | Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh | Process for generating voltage pulse sequences and circuit assembly therefor |
US6348779B1 (en) * | 1999-08-03 | 2002-02-19 | U.S. Philips Corporation | DC/DC up/down converter |
US6437545B2 (en) * | 2000-07-06 | 2002-08-20 | Koninklijke Philips Electronics N.V. | DC/DC converter including control means for controlling multiple outputs using separate switching cycles for each output |
US6456051B2 (en) * | 2000-02-15 | 2002-09-24 | Stmicroelectronics Limited | Voltage converter |
US6566844B1 (en) * | 1999-10-06 | 2003-05-20 | Battery Performance Technologies, Inc. | Method and apparatus for extending the functionality of a battery |
US6590370B1 (en) * | 2002-10-01 | 2003-07-08 | Mti Microfuel Cells Inc. | Switching DC-DC power converter and battery charger for use with direct oxidation fuel cell power source |
-
2003
- 2003-01-10 TW TW092100563A patent/TWI268035B/en not_active IP Right Cessation
- 2003-01-13 US US10/340,622 patent/US6765375B1/en not_active Expired - Fee Related
Patent Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US568044A (en) * | 1896-09-22 | Brake- beam | ||
US4614899A (en) * | 1983-07-08 | 1986-09-30 | Data Ray Corporation | Voltage regulator for pulsed voltage power supplies |
US4614889A (en) * | 1984-04-18 | 1986-09-30 | Mitsubishi Denki Kabushiki Kaisha | Charging dynamoelectric machine having reduced noise output |
US5422562A (en) * | 1994-01-19 | 1995-06-06 | Unitrode Corporation | Switching regulator with improved Dynamic response |
US5568044A (en) * | 1994-09-27 | 1996-10-22 | Micrel, Inc. | Voltage regulator that operates in either PWM or PFM mode |
US5831394A (en) * | 1995-12-21 | 1998-11-03 | Patent-Treuhand-Gesellschaft Fur Elektrische Gluehlampen Mbh | Circuit arrangement for the production of voltage pulse sequences, in particular for the operation of dielectrically impeded discharges |
US5889392A (en) * | 1997-03-06 | 1999-03-30 | Maxim Integrated Products, Inc. | Switch-mode regulators and methods providing transient response speed-up |
US6323600B1 (en) * | 1997-07-22 | 2001-11-27 | Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh | Process for generating voltage pulse sequences and circuit assembly therefor |
US6011382A (en) * | 1998-10-01 | 2000-01-04 | Toko, Inc. | Circuit and method for directly regulating the output voltage of an electroluminescent lamp driver |
US6172494B1 (en) * | 1999-02-23 | 2001-01-09 | U.S. Philips Corporation | Circuit arrangement for delivering a supply current |
US6348779B1 (en) * | 1999-08-03 | 2002-02-19 | U.S. Philips Corporation | DC/DC up/down converter |
US6566844B1 (en) * | 1999-10-06 | 2003-05-20 | Battery Performance Technologies, Inc. | Method and apparatus for extending the functionality of a battery |
US6456051B2 (en) * | 2000-02-15 | 2002-09-24 | Stmicroelectronics Limited | Voltage converter |
US6437545B2 (en) * | 2000-07-06 | 2002-08-20 | Koninklijke Philips Electronics N.V. | DC/DC converter including control means for controlling multiple outputs using separate switching cycles for each output |
US6590370B1 (en) * | 2002-10-01 | 2003-07-08 | Mti Microfuel Cells Inc. | Switching DC-DC power converter and battery charger for use with direct oxidation fuel cell power source |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108112149A (en) * | 2017-12-26 | 2018-06-01 | 生迪智慧科技有限公司 | Power supply control apparatus and lamps and lanterns |
Also Published As
Publication number | Publication date |
---|---|
US6765375B1 (en) | 2004-07-20 |
TWI268035B (en) | 2006-12-01 |
TW200412703A (en) | 2004-07-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6850047B2 (en) | Switching regulator and power supply using the same | |
US6480401B2 (en) | Method and apparatus for reducing standby power in power supplies | |
US8067896B2 (en) | Digitally controlled current regulator for high power solid state lighting | |
US7279869B2 (en) | PFM control circuit for DC regulator | |
US7863833B2 (en) | DC/DC converter control circuit, and power supply apparatus, light emitting apparatus and electronic device using the same | |
US8456103B2 (en) | Current regulator apparatus and methods | |
US7129679B2 (en) | Power supply circuit having soft start | |
US7579784B2 (en) | Switching power supply and its control circuit, and electronic apparatus employing such switching power supply | |
US6226190B1 (en) | Off-line converter with digital control | |
US6798177B1 (en) | Boost-buck cascade converter for pulsating loads | |
US7471071B2 (en) | Extending the voltage operating range of boost regulators | |
US20090027928A1 (en) | Step up converter with overcurrent protection | |
US20040245951A1 (en) | Motor driving apparatus | |
US9590503B2 (en) | Switching converter and associated discharge method | |
TWI608505B (en) | Apparatus, method and circuit of ultra-capacitor based energy storage for appliances | |
US6577110B2 (en) | DC-to-DC converter with constant ripple current regulation for continuous and discontinuous conduction mode operation | |
US20100270950A1 (en) | Dc/dc converter | |
JP2007059635A (en) | Light emitting diode driving device and semiconductor device for driving light emitting diode | |
US6765375B1 (en) | Energy storage circuitry system | |
US6876153B2 (en) | Switching regulator circuit and vehicular lamp | |
US6909618B2 (en) | Switching power supply | |
US20020008498A1 (en) | Charge circuit | |
JPWO2002099947A1 (en) | Power supply device and power supply method for power supply device | |
US7116160B2 (en) | Booster | |
US8680776B1 (en) | Lighting device including a fast start circuit for regulating power supply to a PFC controller |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SUNYEN CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TU, YU-TA;YEH, SHOW-JONG;REEL/FRAME:013661/0903 Effective date: 20030109 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
REMI | Maintenance fee reminder mailed | ||
FPAY | Fee payment |
Year of fee payment: 8 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20160720 |