US20180367041A1 - Dual-Capacitors-Based AC Line Frequency Low Voltage DC Power Supply Circuit - Google Patents
Dual-Capacitors-Based AC Line Frequency Low Voltage DC Power Supply Circuit Download PDFInfo
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- US20180367041A1 US20180367041A1 US15/622,470 US201715622470A US2018367041A1 US 20180367041 A1 US20180367041 A1 US 20180367041A1 US 201715622470 A US201715622470 A US 201715622470A US 2018367041 A1 US2018367041 A1 US 2018367041A1
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- voltage
- power supply
- supply circuit
- low voltage
- capacitors
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- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
-
- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/285—Single converters with a plurality of output stages connected in parallel
-
- 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
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
Definitions
- the present invention relates to low voltage DC power supply circuits.
- the invention more particularly, although not exclusively, relates to dual-capacitor-based AC line frequency supply circuits for low voltage DC power.
- FIG. 1 shows a low voltage DC that is obtained by a resistor and voltage clamping device.
- a circuit using a typical implementation of a linear regulator, such as this method, is simple in design and low cost. However, the circuit suffers from a number of drawbacks. There is a large power loss in the resistor R 1 .
- the resistor and voltage clamping device also exhibit low efficiency, poor thermal performance regarding power loss handling, and poor line and load regulation.
- FIG. 2 shows a high voltage (“HV”) input linear regulator.
- the HV input linear regulator circuit gives a better voltage regulation at V out .
- the HV circuit suffers from similar disadvantages to the resistor and voltage clamping device depicted in FIG. 1 .
- the HV input linear regulator circuit suffers from high power loss in the series pass transistor, poor thermal performance, and needs a high voltage device as the series pass transistor.
- FIG. 3 shows a current source tied from a high-voltage rectified DC (V rect ).
- V rect high-voltage rectified DC
- FIG. 4 shows a HV current source that supplies the start-up current with an auxiliary coil that supplies the operating current.
- the depicted controller has a built-in oscillator to drive the inductor to provide the appropriate DC voltage through the auxiliary coil. This circuit is undesirable because the current source must be operating at high voltage and the circuit itself is more complex. The transformer required to attain the appropriate DC voltage is expensive and there is poor EMI performance.
- FIG. 5 shows a low-power switching mode power supply (“SMPS”).
- SMPS low-power switching mode power supply
- a low-power SMPS may be used to supply the DC output voltage to the load.
- the power loss overhead for the SMPS is very high if it is supposed to deliver only 10 mA 5 V to the load. This results in a low efficiency circuit with poor EMI performance and there is audio noise as well.
- FIG. 6A shows a one-sided AC charge pump circuit connected to either LIVE or NEUTRAL lines. It is comprised of C 3 , C 4 , D 5 , D 6 and a voltage clamping device.
- V(neutral) is going up, C 4 is charged and pumped to C 3 via D 5 as VC voltage which is clamped by the voltage clamping device.
- V(neutral) is going down, C 4 is discharged to the load through the discharging path.
- a flatter voltage can be obtained at VC by smoothing VD with C 3 and D 5 .
- V rect will be built up to a peak of 600 V+ (or the peak-to-peak AC voltage at maximum). It may cause breakdown to the device attached to Vrect line (e.g. HV capacitor, MOS switching device, etc.). As there is only a small ripple on V(neutral) relative to GND, it is not sufficient to pump up the voltage at VC. Hence, the circuit cannot operate properly under the light load condition. This is mainly caused by the imbalance condition of the main rectifying bridge on the LIVE or NEUTRAL lines.
- FIG. 7A shows a one-sided AC charge pump on a V rect line with extra resistance for standby power.
- the one-sided AC charge pump input may be connected directly to the V rect line that will have sufficient ripple to charge C 4 and pump C 3 to the desirable voltage at VC (see waveforms depicted in FIG. 7B ).
- the ripple may not be high enough for the AC charge-pump action. So the V rect line requires loading by R 1 to dissipate the minimum power so as to maintain the minimum ripple in order to ensure the charge-pump action. Otherwise, VC will not reach the desirable voltage level. As a result, some minimum power is dissipated in R 1 , so it will reduce the overall efficiency.
- a dual-capacitor based AC line-frequency supply circuit is provided.
- the supply circuit includes a rectifying bridge arranged in series between two high voltage capacitors.
- An AC line charges the intermediate (low-voltage) capacitor through the two high voltage capacitors and the rectifying bridge.
- a voltage clamping device limits the intermediate voltage at the low voltage capacitor and a regulator provides an output voltage.
- the two high voltage capacitors ensure a balanced load on the AC line during successive AC voltage cycles.
- the optional plurality of resistors limit the inrush current supplied to the high voltage capacitors under the condition of AC voltage surge and spike.
- the output voltage provided by the supply circuit is DC.
- the AC line voltage can charge the intermediate low-voltage capacitor via two high-voltage capacitors through the rectifying bridge. Compared to the one-sided AC charge pump method described above, this dual-capacitor based method ensures a balanced load on the AC line at each AC voltage cycle.
- FIG. 1 shows a typical prior art low voltage DC circuit obtained by a resistor and voltage clamping device
- FIG. 2 shows a typical prior art high voltage input linear regulator circuit
- FIG. 3 shows a typical prior art current source tied from a high voltage rectified DC circuit
- FIG. 4 shows a typical prior art high voltage current source supplying the start-up current and auxiliary coil supplying the operating current circuit
- FIG. 5 shows a typical prior art low power SMPS circuit
- FIG. 6A shows a typical prior art one-sided AC charge pump circuit connected to LIVE or NEUTRAL
- FIG. 6B shows the waveforms of the circuit of FIG. 6 during normal operation when C 4 is fully discharged
- FIG. 6C shows the waveforms of the circuit of FIG. 6 if the voltage of C 4 is not fully discharged
- FIG. 7A shows a typical prior art one-sided AC charge pump on a V rect line with an extra resistor for standby power
- FIG. 7B shows the waveforms of the voltage at the VC of the circuit of FIG. 7A ;
- FIG. 8 is a schematic circuit diagram for one embodiment of the disclosed low voltage DC power supply using dual capacitors operating at AC line frequency;
- FIG. 9A shows the waveforms of the current of the high-voltage capacitors of the circuit of FIG. 8 (normal load);
- FIG. 9B shows the waveforms of the V rect of the circuit of FIG. 8 (light load).
- FIG. 10 is a schematic circuit diagram of another embodiment of the disclosed low voltage DC power supply using dual capacitors operating at AC line frequency;
- FIG. 11A is a schematic circuit diagram of a rectifier for the circuit of FIG. 10 ;
- FIG. 11B is a schematic circuit diagram of an alternative rectifier for the circuit of FIG. 10 ;
- FIG. 12A is a schematic circuit diagram of a voltage clamping device for the circuit of FIG. 10 ;
- FIG. 12B is a schematic circuit diagram of an alternative voltage clamping device for the circuit of FIG. 10 ;
- FIG. 13 is a schematic circuit diagram of a V out regulator for the circuit of FIG. 10 .
- FIG. 8 is a schematic circuit diagram for an embodiment of the disclosed dual-capacitor based AC line frequency low voltage DC power supply circuit is designated by the numeral 100 in FIG. 8 .
- the AC line voltage charges the intermediate low-voltage capacitor 102 via two high-voltage capacitors 104 , 106 .
- the two high-voltage capacitors 104 , 106 are charged through the full wave rectifying bridge 110 .
- the inrush current is limited by two resistors 120 , 122 , each mounted in series with a high-voltage capacitor 104 , 106 .
- the charging and discharging of current of the high-voltage capacitors 104 , 106 is shown in FIG. 9A .
- the voltage clamping device 130 limits the intermediate voltage VC at the low-voltage capacitor 102 .
- the intermediate voltage VC is typically between 4 V and 40 V.
- the regulator 132 gives a DC output voltage at V out .
- the DC output voltage is typically 3 V to 5 V for a 10 mA load. As there is no switching element, the regulator 132 has good line harmonic current response and EMI performance.
- V rect peak voltage will still be kept within normal rating (i.e. peak AC voltage) as shown in the wave form of FIG. 9B .
- the dual-capacitor based AC line frequency low voltage DC power supply circuit 100 exhibits relatively low power loss which leads to good thermal response.
- the simple circuit design also provides good line harmonic current and the inductorless design significantly lowers the cost. There is no switching noise which improves the EMI performance, and the circuit allows a balanced load on the LIVE and NEUTRAL lines compared to one-sided AC charge pump schematics.
- the major part of the circuit is designed in the form of integrated circuit 140 .
- the integrated circuit 140 comprises a rectifier bridge 110 , voltage clamping device 130 , and regulator 132 . This allows the second rectifier bridge 110 to be implemented as synchronous rectifiers. This further reduces the forward voltage drop loss and further improves the power efficiency.
- the rectifier bridge 110 can be four diodes (as depicted in FIG. 11A ), four synchronous rectifying devices implemented by MOSFET (as depicted in FIG. 11B ), or a combination of both four diodes and MOSFET.
- the voltage clamping device 130 can be either a Zener diode (as depicted in FIG. 12A ) or an error amplifier and MOSFET (as depicted in FIG. 12B ).
- the V out regulator 130 can be a linear regulator or an LDO regulator.
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Abstract
Description
- The present invention relates to low voltage DC power supply circuits. The invention more particularly, although not exclusively, relates to dual-capacitor-based AC line frequency supply circuits for low voltage DC power.
- Prior art low power off-line AC-DC power supplies are shown in
FIGS. 1-7 .FIG. 1 shows a low voltage DC that is obtained by a resistor and voltage clamping device. A circuit using a typical implementation of a linear regulator, such as this method, is simple in design and low cost. However, the circuit suffers from a number of drawbacks. There is a large power loss in the resistor R1. A typical loss is 220V×15 mA=3.3 W; (where Iout=10 mA and IZener diode=5 mA). The resistor and voltage clamping device also exhibit low efficiency, poor thermal performance regarding power loss handling, and poor line and load regulation. -
FIG. 2 shows a high voltage (“HV”) input linear regulator. - Compared to the circuit of
FIG. 1 , the HV input linear regulator circuit gives a better voltage regulation at Vout. However, the HV circuit suffers from similar disadvantages to the resistor and voltage clamping device depicted inFIG. 1 . Specifically, the HV input linear regulator circuit suffers from high power loss in the series pass transistor, poor thermal performance, and needs a high voltage device as the series pass transistor. -
FIG. 3 shows a current source tied from a high-voltage rectified DC (Vrect). The circuit for this method may reduce the power loss compared to the circuit inFIG. 1 , but the current source must be a high-voltage device. This increases the cost of implementation. The inherent V-I loss on the current source itself is also still significant. -
FIG. 4 shows a HV current source that supplies the start-up current with an auxiliary coil that supplies the operating current. The depicted controller has a built-in oscillator to drive the inductor to provide the appropriate DC voltage through the auxiliary coil. This circuit is undesirable because the current source must be operating at high voltage and the circuit itself is more complex. The transformer required to attain the appropriate DC voltage is expensive and there is poor EMI performance. -
FIG. 5 shows a low-power switching mode power supply (“SMPS”). A low-power SMPS may be used to supply the DC output voltage to the load. However, the power loss overhead for the SMPS is very high if it is supposed to deliver only 10 mA 5 V to the load. This results in a low efficiency circuit with poor EMI performance and there is audio noise as well. -
FIG. 6A shows a one-sided AC charge pump circuit connected to either LIVE or NEUTRAL lines. It is comprised of C3, C4, D5, D6 and a voltage clamping device. When V(neutral) is going up, C4 is charged and pumped to C3 via D5 as VC voltage which is clamped by the voltage clamping device. When V(neutral) is going down, C4 is discharged to the load through the discharging path. At the same time, a flatter voltage can be obtained at VC by smoothing VD with C3 and D5. By connecting VC to a regulator, we may easily get a DC output at Vout to drive a controller circuit. - Referring to
FIG. 6B , under the case of normal load R1 on the Vrect line, C4 is fully discharged, and V(neutral) will reach 0 V during the AC cycle. In such case, Vrect will look like a rectified AC voltage which peak is about 220 V*1.414=310 V. - The advantages of this circuit are that it is a simple design that is low in cost. There are no inductors and there is a good line harmonic current. The circuit also results in relatively low power loss.
- However, if there is only light load R1 on the Vrect line, the voltage of C4 will not be fully discharged to 0 V during the AC cycle as shown in
FIG. 6C , and it will store the peak AC voltage (about 300 V) in C4. On top of this, Vrect will be built up to a peak of 600 V+ (or the peak-to-peak AC voltage at maximum). It may cause breakdown to the device attached to Vrect line (e.g. HV capacitor, MOS switching device, etc.). As there is only a small ripple on V(neutral) relative to GND, it is not sufficient to pump up the voltage at VC. Hence, the circuit cannot operate properly under the light load condition. This is mainly caused by the imbalance condition of the main rectifying bridge on the LIVE or NEUTRAL lines. -
FIG. 7A shows a one-sided AC charge pump on a Vrect line with extra resistance for standby power. To cater to the imbalance issue, the one-sided AC charge pump input may be connected directly to the Vrect line that will have sufficient ripple to charge C4 and pump C3 to the desirable voltage at VC (see waveforms depicted inFIG. 7B ). As it is in balanced condition, the Vrect peak will only be the peak of the AC voltage (e.g. 220 V×1.414=310 V at maximum) - However, at light load condition, the ripple may not be high enough for the AC charge-pump action. So the Vrect line requires loading by R1 to dissipate the minimum power so as to maintain the minimum ripple in order to ensure the charge-pump action. Otherwise, VC will not reach the desirable voltage level. As a result, some minimum power is dissipated in R1, so it will reduce the overall efficiency.
- Briefly stated, a dual-capacitor based AC line-frequency supply circuit is provided.
- The supply circuit includes a rectifying bridge arranged in series between two high voltage capacitors. An AC line charges the intermediate (low-voltage) capacitor through the two high voltage capacitors and the rectifying bridge. A voltage clamping device limits the intermediate voltage at the low voltage capacitor and a regulator provides an output voltage.
- The two high voltage capacitors ensure a balanced load on the AC line during successive AC voltage cycles. The optional plurality of resistors limit the inrush current supplied to the high voltage capacitors under the condition of AC voltage surge and spike. The output voltage provided by the supply circuit is DC.
- The AC line voltage can charge the intermediate low-voltage capacitor via two high-voltage capacitors through the rectifying bridge. Compared to the one-sided AC charge pump method described above, this dual-capacitor based method ensures a balanced load on the AC line at each AC voltage cycle.
- Preferred forms of the present invention will now be described by way of example with reference to the accompanying drawings, wherein:
-
FIG. 1 shows a typical prior art low voltage DC circuit obtained by a resistor and voltage clamping device; -
FIG. 2 shows a typical prior art high voltage input linear regulator circuit; -
FIG. 3 shows a typical prior art current source tied from a high voltage rectified DC circuit; -
FIG. 4 shows a typical prior art high voltage current source supplying the start-up current and auxiliary coil supplying the operating current circuit; -
FIG. 5 shows a typical prior art low power SMPS circuit; -
FIG. 6A shows a typical prior art one-sided AC charge pump circuit connected to LIVE or NEUTRAL; -
FIG. 6B shows the waveforms of the circuit ofFIG. 6 during normal operation when C4 is fully discharged; -
FIG. 6C shows the waveforms of the circuit ofFIG. 6 if the voltage of C4 is not fully discharged; -
FIG. 7A shows a typical prior art one-sided AC charge pump on a Vrect line with an extra resistor for standby power; -
FIG. 7B shows the waveforms of the voltage at the VC of the circuit ofFIG. 7A ; -
FIG. 8 is a schematic circuit diagram for one embodiment of the disclosed low voltage DC power supply using dual capacitors operating at AC line frequency; -
FIG. 9A shows the waveforms of the current of the high-voltage capacitors of the circuit ofFIG. 8 (normal load); -
FIG. 9B shows the waveforms of the Vrect of the circuit ofFIG. 8 (light load); -
FIG. 10 is a schematic circuit diagram of another embodiment of the disclosed low voltage DC power supply using dual capacitors operating at AC line frequency; -
FIG. 11A is a schematic circuit diagram of a rectifier for the circuit ofFIG. 10 ; -
FIG. 11B is a schematic circuit diagram of an alternative rectifier for the circuit ofFIG. 10 ; -
FIG. 12A is a schematic circuit diagram of a voltage clamping device for the circuit ofFIG. 10 ; -
FIG. 12B is a schematic circuit diagram of an alternative voltage clamping device for the circuit ofFIG. 10 ; and -
FIG. 13 is a schematic circuit diagram of a Vout regulator for the circuit ofFIG. 10 . - With reference to the drawings wherein like numerals represent like parts throughout the figures, is a schematic circuit diagram for an embodiment of the disclosed dual-capacitor based AC line frequency low voltage DC power supply circuit is designated by the numeral 100 in
FIG. 8 . - The AC line voltage charges the intermediate low-
voltage capacitor 102 via two high-voltage capacitors voltage capacitors wave rectifying bridge 110. The inrush current is limited by tworesistors voltage capacitor voltage capacitors FIG. 9A . - The dual high-
voltage capacitors voltage capacitors - The
voltage clamping device 130 limits the intermediate voltage VC at the low-voltage capacitor 102. In the depicted embodiment, the intermediate voltage VC is typically between 4 V and 40 V. Theregulator 132 gives a DC output voltage at Vout. The DC output voltage is typically 3 V to 5 V for a 10 mA load. As there is no switching element, theregulator 132 has good line harmonic current response and EMI performance. - When there is only light load, it can still be maintained in a balanced condition. The two high-
voltage capacitors FIG. 9B . - The dual-capacitor based AC line frequency low voltage DC
power supply circuit 100 exhibits relatively low power loss which leads to good thermal response. The simple circuit design also provides good line harmonic current and the inductorless design significantly lowers the cost. There is no switching noise which improves the EMI performance, and the circuit allows a balanced load on the LIVE and NEUTRAL lines compared to one-sided AC charge pump schematics. - In the embodiment depicted in
FIG. 10 , the major part of the circuit is designed in the form ofintegrated circuit 140. Theintegrated circuit 140 comprises arectifier bridge 110,voltage clamping device 130, andregulator 132. This allows thesecond rectifier bridge 110 to be implemented as synchronous rectifiers. This further reduces the forward voltage drop loss and further improves the power efficiency. - The
rectifier bridge 110 can be four diodes (as depicted inFIG. 11A ), four synchronous rectifying devices implemented by MOSFET (as depicted inFIG. 11B ), or a combination of both four diodes and MOSFET. Thevoltage clamping device 130 can be either a Zener diode (as depicted inFIG. 12A ) or an error amplifier and MOSFET (as depicted inFIG. 12B ). Referring toFIG. 13 , the Vout regulator 130 can be a linear regulator or an LDO regulator. - Although a dual-capacitor based AC line frequency low voltage DC
power supply circuit 100 is described, other embodiments are envisaged to be within the scope of this specification. Therefore, while there has been described in the foregoing description preferred embodiments of the present invention, it will be understood by those skilled in the technology concerned that many variations or modifications in details of design, construction or operation may be made without departing from the scope of the present invention as claimed.
Claims (12)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US15/622,470 US10164538B1 (en) | 2017-06-14 | 2017-06-14 | Dual-capacitors-based AC line frequency low voltage DC power supply circuit |
CN201810609270.0A CN109088552A (en) | 2017-06-14 | 2018-06-13 | AC line frequency low voltage DC power supply circuit based on dual-capacitor |
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US15/622,470 US10164538B1 (en) | 2017-06-14 | 2017-06-14 | Dual-capacitors-based AC line frequency low voltage DC power supply circuit |
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US20180367041A1 true US20180367041A1 (en) | 2018-12-20 |
US10164538B1 US10164538B1 (en) | 2018-12-25 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111813169A (en) * | 2019-04-08 | 2020-10-23 | 德克萨斯仪器股份有限公司 | Power supply voltage clamp for improving power supply rejection ratio |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3908159A (en) * | 1974-06-03 | 1975-09-23 | Quasar Electronics Corp | Regulated power supply with start-up and protective circuits |
US5481449A (en) * | 1994-03-21 | 1996-01-02 | General Electric Company | Efficient, high power density, high power factor converter for very low dc voltage applications |
JPH11296235A (en) * | 1998-04-09 | 1999-10-29 | Yamaha Corp | Power supply circuit and electric apparatus using the same |
DE10118285A1 (en) * | 2001-04-12 | 2002-11-07 | Philips Corp Intellectual Pty | Circuit for converting AC voltage to DC voltage |
CN1302596C (en) * | 2002-07-26 | 2007-02-28 | 联想(北京)有限公司 | Burst load power source supply method |
US20060232244A1 (en) * | 2005-04-18 | 2006-10-19 | Texas Instruments Incorporated | Systems for charging a battery in a closed loop configuration |
CN201163832Y (en) * | 2008-01-16 | 2008-12-10 | 赵正松 | LED lamp suitable for high tension illumination |
CN201248014Y (en) * | 2008-07-09 | 2009-05-27 | 王聪 | Voltage reverting circuit |
US9099879B2 (en) * | 2009-03-13 | 2015-08-04 | Koninklijke Philips N.V. | Supply circuit for supplying power to a switch circuit |
JP2010287340A (en) * | 2009-06-09 | 2010-12-24 | Nitta Ind Corp | Led lighting device |
RU2556700C2 (en) * | 2010-02-18 | 2015-07-20 | Конинклейке Филипс Электроникс Н.В. | Power supply system with reduced power losses, electronic device and controller |
ITRE20120021A1 (en) * | 2012-04-02 | 2013-10-03 | Igor Spinella | METHOD AND APPARATUS FOR ELECTRIC POWER TRANSFER |
AU2014206162B2 (en) * | 2014-07-24 | 2019-03-14 | Siemens Aktiengesellschaft | Electrical power conversion system |
CN204191009U (en) * | 2014-11-26 | 2015-03-04 | 无锡硅动力微电子股份有限公司 | LED color-temperature regulating chip and application circuit thereof |
CN104682763B (en) * | 2015-03-10 | 2018-05-22 | 中国科学院电子学研究所 | Energy regenerative constant pressure clamper high speed turn-off method and apparatus |
-
2017
- 2017-06-14 US US15/622,470 patent/US10164538B1/en not_active Expired - Fee Related
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111813169A (en) * | 2019-04-08 | 2020-10-23 | 德克萨斯仪器股份有限公司 | Power supply voltage clamp for improving power supply rejection ratio |
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CN109088552A (en) | 2018-12-25 |
US10164538B1 (en) | 2018-12-25 |
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