CN108235526B - Control circuit - Google Patents
Control circuit Download PDFInfo
- Publication number
- CN108235526B CN108235526B CN201810286347.5A CN201810286347A CN108235526B CN 108235526 B CN108235526 B CN 108235526B CN 201810286347 A CN201810286347 A CN 201810286347A CN 108235526 B CN108235526 B CN 108235526B
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- China
- Prior art keywords
- unit
- control unit
- power supply
- output
- dimming
- Prior art date
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- 238000002955 isolation Methods 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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]
-
- 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
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The embodiment of the invention discloses a control circuit which comprises a dimming control unit, a current loop control unit, an auxiliary power supply unit, an output unit, an isolation unit and a switch unit. The auxiliary power supply unit is connected with the current loop control unit, and the current loop control unit is connected with the output unit; the isolation unit is respectively connected with the dimming control unit and the current loop control unit, and the switch unit is respectively connected with the dimming control unit and the auxiliary power supply unit. By arranging the isolation unit and the switch unit in the control circuit, the dimming control unit and the output unit can be electrically isolated, and the operation safety of a user is greatly ensured. When the output signal of the dimming control unit is overlarge, the switch unit cuts off the power supply of the auxiliary power supply unit to the current loop control unit, so that the output unit also stops working, and the power consumption of the output unit is greatly reduced.
Description
Technical Field
The invention relates to the technical field of LED driving power supplies, in particular to a control circuit.
Background
The LED driving power source is a power converter that converts a power supply into a specific voltage and current to drive the LEDs to emit light.
In LED driving power applications, the output is usually not isolated from the dimming circuit, and the output is connected to the dimming terminal only by discrete components, which cannot achieve a real safety effect.
When the output voltage is high, if a certain element between the dimming end and the output end is damaged, the output high-voltage is highly likely to flow to the dimming end. The dimming port is a place where people often have a chance to touch, and when the output high-voltage jumps to the dimming end, if people touch the dimming end, the people may possibly hurt the human body.
Disclosure of Invention
The embodiment of the invention provides a control circuit which is used for improving the safety of an LED driving power supply.
The invention provides a control circuit which comprises a dimming control unit, a current loop control unit, an auxiliary power supply unit and an output unit, wherein the dimming control unit is connected with the current loop control unit; the auxiliary power supply unit is connected with the current loop control unit, and the current loop control unit is connected with the output unit; the control circuit further includes:
the isolation unit is respectively connected with the dimming control unit and the current loop control unit, and is used for electrically isolating the dimming control unit from the current loop control unit and outputting a dimming signal output by the dimming control unit to the current loop control unit; and
and the switch unit is respectively connected with the dimming control unit and the auxiliary power supply unit, and is used for electrically isolating the dimming control unit from the auxiliary power supply unit and cutting off the power supply of the auxiliary power supply unit to the current loop control unit when the current value of the output signal of the dimming control unit is larger than a preset current threshold value.
The isolation unit comprises a first photoelectric coupler and an inverse amplifier, wherein the input end of the first photoelectric coupler is connected with the dimming control unit, the output end of the first photoelectric coupler is connected with the input end of the inverse amplifier, and the output end of the inverse amplifier is connected with the current loop control unit.
The further technical scheme is that a first current limiting resistor is arranged between the isolation unit and the dimming control unit.
The switching unit comprises a second photoelectric coupler and a switching tube, wherein the input end of the second photoelectric coupler is connected with the input end of the switching tube, the output end of the second photoelectric coupler is connected with the power supply end of the auxiliary power supply unit, the control end of the switching tube is connected with the dimming control unit, the input end of the switching tube is connected with a voltage source, and the output end of the switching tube is grounded.
The further technical scheme is that the switching unit further comprises a diode, the positive electrode of the diode is connected with the dimming control unit, and the negative electrode of the diode is connected with the control end of the switching tube.
The further technical scheme is that the switch unit further comprises a voltage dividing resistor, one end of the voltage dividing resistor is connected with the cathode of the diode, and the other end of the voltage dividing resistor is grounded.
The further technical scheme is that the switch unit further comprises a filter capacitor, one end of the filter capacitor is connected with the cathode of the diode, and the other end of the filter capacitor is grounded.
The further technical scheme is that the switch tube is a MOS tube or a triode.
The further technical scheme is that the input end of the switching tube is connected with the voltage source through a pull-up resistor.
The further technical scheme is that a second current limiting resistor is arranged between the switch unit and the dimming control unit.
By applying the technical scheme of the invention, the isolation unit and the switch unit are arranged in the control circuit, the isolation unit is respectively connected with the dimming control unit and the current loop control unit, and the switch unit is respectively connected with the dimming control unit and the auxiliary power supply unit. The dimming control unit and the output unit can be electrically isolated through the isolation unit and the switch unit, so that the operation safety of a user is greatly ensured. When the output signal of the dimming control unit is overlarge, the switch unit cuts off the power supply of the auxiliary power supply unit to the current loop control unit, so that the output unit also stops working, and the power consumption of the output unit is greatly reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of a control circuit according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a control circuit according to an embodiment of the present invention.
Reference numerals
10. A dimming control unit; 20. an isolation unit; 30. a switching unit; 40. a current loop control unit; 50. an auxiliary power supply unit; 60. and an output unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, in which like reference numerals represent like components. It will be apparent that the embodiments described below are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the embodiments of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments of the invention. As used in the specification of the embodiments of the invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Referring to fig. 1, a schematic block diagram of a control circuit according to an embodiment of the present invention is provided, where the control circuit is applied to an LED driving power supply. As shown, the control circuit includes a dimming control unit 10, a current loop control unit 40, an auxiliary power supply unit 50, an output unit 60, an isolation unit 20, and a switching unit 30. The main components are described as follows:
the dimming control unit 10 is a dimming operation part for a user to operate the dimming control unit 10, the dimming control unit 10 correspondingly generates an output signal and sends the output signal to the current loop control unit 40, and the current loop control unit 40 correspondingly regulates and controls the output of the output unit 60 according to the output signal of the dimming control unit 10. The auxiliary power supply unit 50 is connected to the current steering unit 40, and the auxiliary power supply unit 50 supplies power to the current steering unit 40. The current steering unit 40 is connected to the output unit 60, and the output of the output unit 60 is controlled by the current steering unit 40.
In the embodiment of the present invention, the control circuit further includes an isolation unit 20, and the isolation unit 20 is connected to the dimming control unit 10 and the current loop control unit 40 respectively. On the one hand, the isolation unit 20 is used for electrically isolating the dimming control unit 10 from the current loop control unit 40, so that the high voltage at the output end cannot flow to the dimming control unit 10, and the operation safety of the user is greatly ensured. On the other hand, the isolation unit 20 is further configured to output the dimming signal output by the dimming control unit 10 to the current loop control unit 40, so as to ensure that the dimming control unit 10 accurately regulates and controls the current loop control unit 40.
In the embodiment of the present invention, the control circuit further includes a switch unit 30, and the switch unit 30 is connected to the dimming control unit 10 and the auxiliary power supply unit 50 respectively. On the one hand, the switching unit 30 is used for electrically isolating the dimming control unit 10 from the auxiliary power supply unit 50, so that the high voltage at the output end cannot flow to the dimming control unit 10, and the operation safety of the user is greatly ensured. On the other hand, the auxiliary power supply unit 50 cuts off the power supply to the current steering unit 40 when the current value of the output signal of the dimming control unit 10 is greater than the preset current threshold. When the output signal of the dimming control unit 10 is large, the current at the output end is correspondingly large, and the energy consumption of the output end is high, in this case, the switch unit 30 cuts off the power supply of the auxiliary power supply unit 50 to the current loop control unit 40, so that the current loop control unit 40 stops working, and the output unit 60 also stops working, and the power consumption of the output unit 60 is greatly reduced.
By applying the technical solution of the present embodiment, the isolation unit 20 and the switch unit 30 are disposed in the control circuit, the isolation unit 20 is connected with the dimming control unit 10 and the current loop control unit 40, and the switch unit 30 is connected with the dimming control unit 10 and the auxiliary power supply unit 50. The isolation unit 20 and the switching unit 30 can electrically isolate the dimming control unit 10 from the output unit 60, and thus greatly secure the operation safety of the user. When the output signal of the dimming control unit 10 is too large, the switch unit 30 cuts off the power supply of the auxiliary power supply unit 50 to the current loop control unit 40, and the output unit 60 stops working, so that the power consumption of the output unit 60 is greatly reduced.
Referring to fig. 2, which is a circuit diagram of a control circuit according to an embodiment of the present invention, it can be seen that the isolation unit 20 includes a first photo-coupler U303 and an inverting amplifier IC202, an input end of the first photo-coupler U303 is connected to the dimming control unit 10, an output end of the first photo-coupler U303 is connected to an input end of the inverting amplifier IC202, and an output end of the inverting amplifier IC202 is connected to the current loop control unit 40. The first photocoupler U303 may electrically isolate the dimming control unit 10 from the current steering unit 40, and simultaneously output the output signal of the dimming control unit 10 to the current steering unit 40 by the inverting amplifier IC 202.
Further, the switching unit 30 includes a second photo coupler U301 and a switching tube Q301. The input end of the second photo coupler U301 is connected to the input end of the switching tube Q301, and the output end of the second photo coupler U301 is connected to the power supply end of the auxiliary power supply unit 50. The control end of the switching tube Q301 is connected with the dimming control unit 10, the input end of the switching tube Q301 is connected with a voltage source, and the output end of the switching tube Q301 is grounded. Specifically, the input terminal of the switching tube Q301 is connected to a voltage source through a pull-up resistor R301. In this embodiment, the switching transistor Q301 is a MOS transistor, or in other embodiments, the switching transistor Q301 may be a triode.
It should be noted that, the input end of the triode is its collector, the output end of the triode is its emitter, and the control end of the triode is its base.
The input end of the MOS tube is a drain electrode, the output end of the MOS tube is a source electrode, and the control end of the MOS tube is a grid electrode.
When the current value of the output signal of the dimming control unit 10 is lower than a preset current threshold value, the switching tube Q301 is in a conducting state, the voltage of the voltage source is pulled down, the second photoelectric coupler U301 is in a disconnecting state at the moment, and the auxiliary power supply unit 50 normally supplies power to the current loop control unit 40; when the current value of the output signal of the dimming control unit 10 is greater than the preset current threshold, the switching tube Q301 is in an off state, at this time, the second photo coupler U301 is in an on state, and the second photo coupler U301 pulls down the voltage of the power supply end of the auxiliary power supply unit 50, so as to cut off the power supply of the auxiliary power supply unit 50 to the current loop control unit 40.
Further, the switching unit 30 further includes a diode D305, a voltage dividing resistor R302, and a filter capacitor C301. The positive electrode of the diode D305 is connected to the dimming control unit 10, and the negative electrode of the diode D305 is connected to the control terminal of the switching transistor Q301. The diode D305 can realize unidirectional flow of current between the dimming control unit 10 and the auxiliary power unit 50.
One end of the voltage dividing resistor R302 is connected with the cathode of the diode D305, the other end of the voltage dividing resistor R302 is grounded, and the voltage dividing resistor R302 can reduce the voltage of the control end of the switching tube Q301.
One end of the filter capacitor C301 is connected with the cathode of the diode D305, the other end of the filter capacitor C301 is grounded, and the filter capacitor C301 can absorb high-frequency clutter in the circuit and improve the stability of the circuit.
Meanwhile, a first current limiting resistor R304 is arranged between the isolation unit 20 and the dimming control unit 10, a second current limiting resistor R307 is arranged between the switch unit 30 and the dimming control unit 10, and the first current limiting resistor R304 and the second current limiting resistor R307 can reduce current fluctuation and improve circuit stability.
It should be noted that the dimming control unit 10, the current loop control unit 40, the auxiliary power supply unit 50, and the output unit 60 are well known to those skilled in the art, and will not be described in detail.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. A control circuit comprises a dimming control unit, a current loop control unit, an auxiliary power supply unit and an output unit; the auxiliary power supply unit is connected with the current loop control unit, and the current loop control unit is connected with the output unit; characterized in that the control circuit further comprises:
the isolation unit is respectively connected with the dimming control unit and the current loop control unit, and is used for electrically isolating the dimming control unit from the current loop control unit and outputting a dimming signal output by the dimming control unit to the current loop control unit; and
and the switch unit is respectively connected with the dimming control unit and the auxiliary power supply unit, and is used for electrically isolating the dimming control unit from the auxiliary power supply unit and cutting off the power supply of the auxiliary power supply unit to the current loop control unit when the current value of the output signal of the dimming control unit is larger than a preset current threshold value.
2. The control circuit of claim 1, wherein the isolation unit comprises a first optocoupler and an inverting amplifier, an input of the first optocoupler is connected to the dimming control unit, an output of the first optocoupler is connected to an input of the inverting amplifier, and an output of the inverting amplifier is connected to the current-steering unit.
3. A control circuit according to claim 1 or 2, wherein a first current limiting resistor is provided between the isolation unit and the dimming control unit.
4. The control circuit according to claim 1, wherein the switching unit includes a second photo coupler and a switching tube, an input end of the second photo coupler is connected to an input end of the switching tube, an output end of the second photo coupler is connected to a power supply end of the auxiliary power supply unit, a control end of the switching tube is connected to the dimming control unit, an input end of the switching tube is connected to a voltage source, and an output end of the switching tube is grounded.
5. The control circuit of claim 4, wherein the switching unit further comprises a diode, an anode of the diode is connected to the dimming control unit, and a cathode of the diode is connected to a control terminal of the switching tube.
6. The control circuit according to claim 5, wherein the switching unit further comprises a voltage dividing resistor, one end of the voltage dividing resistor is connected to the cathode of the diode, and the other end of the voltage dividing resistor is grounded.
7. The control circuit of claim 5, wherein the switching unit further comprises a filter capacitor, one end of the filter capacitor is connected to the cathode of the diode, and the other end of the filter capacitor is grounded.
8. The control circuit of claim 4, wherein the switching tube is a MOS tube or a triode.
9. The control circuit of claim 4, wherein the input of the switching tube is connected to the voltage source through a pull-up resistor.
10. A control circuit according to any one of claims 4-9, characterized in that a second current limiting resistor is arranged between the switching unit and the dimming control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810286347.5A CN108235526B (en) | 2018-04-03 | 2018-04-03 | Control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810286347.5A CN108235526B (en) | 2018-04-03 | 2018-04-03 | Control circuit |
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| Publication Number | Publication Date |
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| CN108235526A CN108235526A (en) | 2018-06-29 |
| CN108235526B true CN108235526B (en) | 2024-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810286347.5A Active CN108235526B (en) | 2018-04-03 | 2018-04-03 | Control circuit |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109041353B (en) * | 2018-09-13 | 2023-09-19 | 深圳茂硕电子科技有限公司 | Variable-gain current loop feedback compensation control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957163A (en) * | 2011-08-23 | 2013-03-06 | 台达电子企业管理（上海）有限公司 | Direct-current chopper and direct-current chopping method for doubly-fed induction generator system |
| TWI532409B (en) * | 2013-05-03 | 2016-05-01 | 隆達電子股份有限公司 | Illumination device and the led dimming circuit thereof |
| US10820389B2 (en) * | 2014-11-11 | 2020-10-27 | Signify Holding B.V. | Driving a lighting element |
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| US6437521B1 (en) * | 1998-06-11 | 2002-08-20 | Innoware Oy | Electronic control circuit |
| KR20120114421A (en) * | 2011-03-16 | 2012-10-17 | (주)프라우텍 | Dimming control led lamp device and method thereof |
| JP2012244779A (en) * | 2011-05-19 | 2012-12-10 | Canon Inc | Power supply and image formation device |
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| Publication number | Publication date |
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| CN108235526A (en) | 2018-06-29 |
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