CN112996188A - Power supply device and control method thereof - Google Patents
Power supply device and control method thereof Download PDFInfo
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- CN112996188A CN112996188A CN202110192499.0A CN202110192499A CN112996188A CN 112996188 A CN112996188 A CN 112996188A CN 202110192499 A CN202110192499 A CN 202110192499A CN 112996188 A CN112996188 A CN 112996188A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004804 winding Methods 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 238000005070 sampling Methods 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000010354 integration Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
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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
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a power supply device and a control method thereof. According to the power supply device and the control method thereof, when the PWM controller controls the load end to be disconnected, the current error amplifier keeps the current error level output at the moment before the disconnection, so that the driving voltage of the load end keeps unchanged. Because the driving voltage of the load end and the voltage of the two ends of the control end come from two closely coupled secondary windings of the same transformer, when the driving voltage of the load end is unchanged, the voltage of the two ends of the control end is also kept unchanged. The embodiment of the invention can ensure that the load end works in a constant current when the load end is conducted, and can also ensure that the voltage at two ends of the control end keeps unchanged and is always stable without disturbance before and after the load end is disconnected.
Description
Technical Field
The invention belongs to the technical field of power supplies, and particularly relates to a power supply device and a control method thereof.
Background
The LED power supply device provided in the prior art generally employs an inverter to simultaneously supply power to an LED load terminal and a control terminal. Since the LEDs are controlled using PWM techniques, they are always switched back and forth between on and off states. In order to enable the LED to work normally and keep the real-time voltage of the control terminal stable, two converters are usually used to supply power to the LED load terminal and the control terminal, respectively, that is, one converter supplies power to the LED load terminal and the other converter supplies power to the control terminal. However, the use of two inverters to supply power to the LED load terminal and the control terminal, respectively, makes the cost of the power supply apparatus high.
Disclosure of Invention
It is an object of the present invention to provide a power supply apparatus and a control method thereof that can solve or at least partially solve the above technical problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, a power supply apparatus is provided, which includes a converter, a transformer, a first rectifying device, a second rectifying device, a PWM controller, a current error amplifier, a voltage converting circuit, a proportional sampling circuit, a voltage error amplifier, and a control driver;
the transformer is connected with a primary winding of the transformer, the transformer is respectively connected with the first rectifying device and the second rectifying device through two secondary windings, the first rectifying device is used for supplying power to a load end, and the second rectifying device is used for supplying power to a control end;
the proportional sampling circuit is used for sampling the voltage of the load end and outputting a first voltage to the voltage error amplifier according to the proportion;
the current error amplifier is used for sampling the current of the load end and outputting a current error level to the voltage conversion circuit according to the comparison between the current and the reference current;
the voltage conversion circuit is used for correcting the reference voltage according to the current error level and outputting a second voltage to the voltage error amplifier as a new reference voltage;
the voltage error amplifier is used for outputting a voltage error level according to comparison and integration of the first voltage and the second voltage;
the control driver is used for driving the converter to work according to the voltage error level, and the current of the load end is made constant by adjusting the voltage of the load end;
the PWM controller is used for controlling the on-off of the load end;
when the PWM controller controls the load end to be disconnected, the current error amplifier keeps the current error level unchanged at the moment before the disconnection, so that the second voltage and the voltage of the load end are kept unchanged.
Optionally, the current error amplifier is connected to the voltage conversion circuit through the follower.
Optionally, the follower is an operational amplifier.
Optionally, the current error amplifier includes a transconductance operational amplifier, a first switch, and an integrating circuit, where the transconductance operational amplifier is configured to output the current error level, the first switch and the integrating circuit are configured to maintain the current error level, the first switch is connected between the transconductance operational amplifier and the integrating circuit, and a PWM signal sent by the PWM controller simultaneously controls on and off of the load terminal and the first switch.
Optionally, the voltage error amplifier comprises a voltage loop proportional integral regulating circuit.
Optionally, the load end is an LED load.
In a second aspect, there is provided a control method of the power supply apparatus described above, including:
when the PWM controller controls the load end to be conducted, the current error amplifier samples the current of the load end, compares the current with the reference current, outputs a current error level, controls the voltage conversion circuit through the current error level, and controls the voltage of the load end through the voltage error amplifier and the control driver, so that the current of the load end is constant;
when the PWM controller controls the load end to be disconnected, the current error amplifier keeps the current error level unchanged at the moment before the load end is disconnected, the voltage conversion circuit is controlled through the current error level, and then the voltage of the load end is controlled through the voltage error amplifier and the control driver, so that the second voltage and the voltage of the load end are kept unchanged.
Optionally, the current error amplifier includes a transconductance operational amplifier, a first switch and an integrating circuit, the transconductance operational amplifier is configured to output the current error level, the first switch and the integrating circuit are configured to keep the current error level unchanged, and the first switch is connected between the transconductance operational amplifier and the integrating circuit;
the control method further comprises the following steps:
and the PWM signal sent by the PWM controller simultaneously controls the on-off of the load end and the first switch.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
according to the power supply device and the control method thereof provided by the embodiment of the invention, when the PWM controller controls the load end to be disconnected, the current error amplifier keeps the current error level output at the moment before the disconnection, so that the driving voltage of the load end keeps unchanged. Because the driving voltage of the load end and the voltage of the two ends of the control end come from two closely coupled secondary windings of the same transformer, when the driving voltage of the load end is unchanged, the voltage of the two ends of the control end is also kept unchanged. Therefore, the embodiment of the invention only needs one converter, has lower cost, can ensure that the load end works in a constant current when the load end is conducted, and can ensure that the voltage at two ends of the control end keeps unchanged before and after the load end is disconnected, is always stable and does not generate disturbance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope covered by the contents disclosed in the present invention.
Fig. 1 to 3 are structural diagrams of a power supply device according to an embodiment of the present invention.
Illustration of the drawings:
11. a converter; 12. a transformer; 13. an LED rectifying device; 14. controlling the rectifying device; 15. a PWM controller; 16. a load end; 17. a control end; 18. a current error amplifier; 19. a proportional sampling circuit; 20. a voltage conversion circuit; 21. a voltage error amplifier; 22. controlling the driver; 23. a follower.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 3, the present embodiment provides a power supply device, which can drive a load terminal 16 and output a stable voltage to a control terminal 17 at the same time, and only needs one converter 11, so that the cost is lower.
Specifically, the power supply device includes a converter 11, a transformer 12, a first rectifying device, a second rectifying device, a PWM controller 15, a current error amplifier 18, a voltage conversion circuit 20, a proportional sampling circuit 19, a voltage error amplifier 21, and a control driver 22.
In this embodiment, the first rectifying device is an LED rectifying device 13, which can supply power to an LED load terminal 16. The second rectifying means is a control rectifying means 14 which can supply power to the control terminal 17.
To build up the circuit as in fig. 1 to 3, the transformer 12 is provided with a primary winding and two secondary windings. The output end of the converter 11 is connected with a primary winding, and the LED rectifying device 13 and the control rectifying device 14 are respectively connected with a secondary winding.
The PWM controller 15 can send out a PWM signal for controlling the on/off of the LED load terminal 16, so as to implement the dimming function of the LED.
In this embodiment, the proportional sampling circuit 19 may sample the voltage of the load terminal 16 and output the first voltage to the voltage error amplifier 21 according to the proportion. Alternatively, the ratio may be a fixed value or a variable value. In this embodiment, the ratio is a fixed value.
The current error amplifier 18 may sample the current at the load terminal 16 and output a current error level to the voltage translation circuit 20 based on a comparison of the current with the reference current Iset. It will be appreciated that for a particular load terminal 16, there should be a known reference current Iset.
The voltage conversion circuit 20 corrects the reference voltage Vref according to the current error level, and outputs the second voltage to the voltage error amplifier 21 as a new reference voltage. It will be appreciated that for a particular power supply arrangement, there should be a known reference voltage Vref.
The voltage error amplifier 21 is configured to output a voltage error level based on a comparison and integration of the first voltage and the second voltage. Therefore, in the present embodiment, the second voltage can be regarded as the set voltage Vset of the voltage error amplifier 21. By sampling the current error level to control the voltage conversion circuit 20, the set voltage value of the voltage error amplifier 21 is changed.
Finally, the control driver 22 drives the converter 11 to operate according to the voltage error level, and the current of the load terminal 16 can be made constant by adjusting the voltage of the load terminal 16. It should be noted that how to drive the converter 11 to operate according to the voltage error level after obtaining the voltage error level so as to make the current at the load terminal 16 constant can be solved by the prior art, and the specific operation principle of the control driver 22 is not described in this embodiment.
The key of the power supply apparatus provided in this embodiment is that when the PWM controller 15 controls the load terminal 16 to turn off, the current error amplifier 18 keeps the current error level at the time before turning off, so that the second voltage and the voltage at the load terminal 16 are kept unchanged.
Since the driving voltage of the load terminal 16 and the voltage across the control terminal 17 are from two closely coupled secondary windings of the same transformer 12, the voltage across the control terminal 17 will remain unchanged when the driving voltage of the load terminal 16 is unchanged. Therefore, the present embodiment can ensure that the load terminal 16 operates at a constant current when the load terminal 16 is turned on, and can ensure that the voltage across the control terminal 17 remains unchanged before and after the load terminal 16 is turned off, and is always stable without disturbance.
As an alternative to this embodiment, the power supply device further comprises a follower 23 for impedance matching between the current error amplifier 18 and the voltage conversion circuit 20. The current error amplifier 18 is connected to the voltage conversion circuit 20 via a follower 23.
As an alternative to this embodiment, the follower 23 is an operational amplifier a2, as shown in fig. 3.
As shown in fig. 3, as an alternative implementation manner of this embodiment, the current error amplifier 18 includes a transconductance operational amplifier a1, a first switch S2, and an integrating circuit composed of a resistor R1 and a capacitor C1, the transconductance operational amplifier a1 is used to output a current error level, the first switch S2 and the integrating circuit are used to maintain the current error level, the first switch S2 is connected between the transconductance operational amplifier a1 and the integrating circuit, and a PWM signal sent by the PWM controller 15 controls on and off of the load terminal 16 and the first switch S2 at the same time.
As an alternative implementation of this embodiment, the voltage error amplifier 21 includes a voltage loop proportional integral regulating circuit a 3.
As an alternative to this embodiment, the load terminal 16 is an LED load.
In another embodiment of the present application, a control method is also provided, which can be used for controlling the power supply device.
The control method comprises the following steps:
when the PWM controller 15 controls the load terminal 16 to be turned on, the current error amplifier 18 samples the current of the load terminal 16, compares the current with the reference current Iset, and outputs a current error level, controls the voltage conversion circuit 20 through the current error level, and further controls the voltage of the load terminal 16 through the voltage error amplifier 21 and the control driver 22, so that the current of the load terminal 16 is constant;
when the PWM controller 15 controls the load terminal 16 to be turned off, the current error amplifier 18 keeps the current error level unchanged at the moment before the turn-off, the voltage conversion circuit 20 is controlled by the current error level, and the voltage of the load terminal 16 is further controlled by the voltage error amplifier 21 and the control driver 22, so that the second voltage and the voltage of the load terminal 16 are kept unchanged.
Further, the control method further comprises:
the PWM signal from the PWM controller 15 controls the on/off of the load terminal 16 and the first switch S2 at the same time.
In summary, the above-mentioned embodiments provide a power supply device and a control method thereof, when the PWM controller 15 controls the load terminal 16 to be turned off, the current error amplifier 18 keeps the current error level output at the moment before the turn-off, so that the driving voltage of the load terminal 16 keeps constant. Since the driving voltage of the load terminal 16 and the voltage across the control terminal 17 are from two closely coupled secondary windings of the same transformer 12, the voltage across the control terminal 17 will remain unchanged when the driving voltage of the load terminal 16 is unchanged. The embodiment only needs one converter, has lower cost, can ensure that the load end 16 works in a constant current when the load end 16 is conducted, and can ensure that the voltage at two ends of the control end 17 keeps unchanged before and after the load end 16 is disconnected, is always stable and does not generate disturbance.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A power supply device is characterized by comprising a converter, a transformer, a first rectifying device, a second rectifying device, a PWM controller, a current error amplifier, a voltage conversion circuit, a proportional sampling circuit, a voltage error amplifier and a control driver;
the transformer is connected with a primary winding of the transformer, the transformer is respectively connected with the first rectifying device and the second rectifying device through two secondary windings, the first rectifying device is used for supplying power to a load end, and the second rectifying device is used for supplying power to a control end;
the proportional sampling circuit is used for sampling the voltage of the load end and outputting a first voltage to the voltage error amplifier according to the proportion;
the current error amplifier is used for sampling the current of the load end and outputting a current error level to the voltage conversion circuit according to the comparison between the current and the reference current;
the voltage conversion circuit is used for correcting the reference voltage according to the current error level and outputting a second voltage to the voltage error amplifier as a new reference voltage;
the voltage error amplifier is used for outputting a voltage error level according to comparison and integration of the first voltage and the second voltage;
the control driver is used for driving the converter to work according to the voltage error level, and the current of the load end is made constant by adjusting the voltage of the load end;
the PWM controller is used for controlling the on-off of the load end;
when the PWM controller controls the load end to be disconnected, the current error amplifier keeps the current error level unchanged at the moment before the disconnection, so that the second voltage and the voltage of the load end are kept unchanged.
2. The power supply device according to claim 1, further comprising a follower, wherein the current error amplifier is connected to the voltage conversion circuit through the follower.
3. The power supply device according to claim 2, wherein the follower is an operational amplifier.
4. The power supply device according to claim 1, wherein the current error amplifier includes a transconductance operational amplifier, a first switch and an integrating circuit, the transconductance operational amplifier is configured to output the current error level, the first switch and the integrating circuit are configured to maintain the current error level, the first switch is connected between the transconductance operational amplifier and the integrating circuit, and a PWM signal generated by the PWM controller simultaneously controls on/off of the load terminal and the first switch.
5. The power supply device of claim 1, wherein the voltage error amplifier comprises a voltage loop proportional integral regulating circuit.
6. The power supply device according to any one of claims 1 to 5, wherein the load terminal is an LED load.
7. A control method of a power supply device according to any one of claims 1 to 6, characterized by comprising:
when the PWM controller controls the load end to be conducted, the current error amplifier samples the current of the load end, compares the current with the reference current, outputs a current error level, controls the voltage conversion circuit through the current error level, and controls the voltage of the load end through the voltage error amplifier and the control driver, so that the current of the load end is constant;
when the PWM controller controls the load end to be disconnected, the current error amplifier keeps the current error level unchanged at the moment before the load end is disconnected, the voltage conversion circuit is controlled through the current error level, and then the voltage of the load end is controlled through the voltage error amplifier and the control driver, so that the second voltage and the voltage of the load end are kept unchanged.
8. The control method according to claim 7, wherein the current error amplifier comprises a transconductance operational amplifier, a first switch and an integrating circuit, the transconductance operational amplifier is used for outputting the current error level, the first switch and the integrating circuit are used for keeping the current error level unchanged, and the first switch is connected between the transconductance operational amplifier and the integrating circuit;
the control method further comprises the following steps:
and the PWM signal sent by the PWM controller simultaneously controls the on-off of the load end and the first switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110192499.0A CN112996188A (en) | 2021-02-20 | 2021-02-20 | Power supply device and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110192499.0A CN112996188A (en) | 2021-02-20 | 2021-02-20 | Power supply device and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN112996188A true CN112996188A (en) | 2021-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110192499.0A Pending CN112996188A (en) | 2021-02-20 | 2021-02-20 | Power supply device and control method thereof |
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| CN (1) | CN112996188A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6822426B1 (en) * | 2003-06-06 | 2004-11-23 | The Boeing Company | Regulator with feedback voltage and current signal summing into controller |
| US20060232226A1 (en) * | 2005-04-19 | 2006-10-19 | Raytheon Company | Method and control circuitry for providing average current mode control in a power converter and an active power filter |
| CN101771344A (en) * | 2008-08-22 | 2010-07-07 | 技领半导体(上海)有限公司 | Average current mode controlled converter having a buck mode, a boost mode, and a partial four-switch mode |
| CN202721617U (en) * | 2012-08-01 | 2013-02-06 | 深圳市和浦泰能源科技有限公司 | Communication power supply |
| CN108633139A (en) * | 2018-05-16 | 2018-10-09 | 东莞市紫能电子科技有限公司 | A kind of supply unit and its control method for stablizing output with two-way |
-
2021
- 2021-02-20 CN CN202110192499.0A patent/CN112996188A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6822426B1 (en) * | 2003-06-06 | 2004-11-23 | The Boeing Company | Regulator with feedback voltage and current signal summing into controller |
| US20060232226A1 (en) * | 2005-04-19 | 2006-10-19 | Raytheon Company | Method and control circuitry for providing average current mode control in a power converter and an active power filter |
| CN101771344A (en) * | 2008-08-22 | 2010-07-07 | 技领半导体(上海)有限公司 | Average current mode controlled converter having a buck mode, a boost mode, and a partial four-switch mode |
| CN202721617U (en) * | 2012-08-01 | 2013-02-06 | 深圳市和浦泰能源科技有限公司 | Communication power supply |
| CN108633139A (en) * | 2018-05-16 | 2018-10-09 | 东莞市紫能电子科技有限公司 | A kind of supply unit and its control method for stablizing output with two-way |
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Effective date of registration: 20210922 Address after: 518000 406, building 1, COFCO Yunjing Plaza, heshuikou community, Matian street, Guangming District, Shenzhen, Guangdong Applicant after: Shenzhen dongzhun Electronic Technology Co.,Ltd. Address before: 523430 Fushan shajingkeng Industrial Zone, Liaobu Town, Dongguan City, Guangdong Province Applicant before: DONGGUAN DONGZHUN ELECTRONIC TECHNOLOGY Co.,Ltd. |
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Application publication date: 20210618 |