CN108990221B - LED dimming circuit, device and electronic equipment - Google Patents
LED dimming circuit, device and electronic equipment Download PDFInfo
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- CN108990221B CN108990221B CN201811092032.3A CN201811092032A CN108990221B CN 108990221 B CN108990221 B CN 108990221B CN 201811092032 A CN201811092032 A CN 201811092032A CN 108990221 B CN108990221 B CN 108990221B
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- 238000002955 isolation Methods 0.000 claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims abstract description 18
- 230000000087 stabilizing effect Effects 0.000 claims description 29
- 239000003990 capacitor Substances 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 18
- 238000011084 recovery Methods 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000006641 stabilisation Effects 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]
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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]
- H05B45/10—Controlling the intensity of the light
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Abstract
The invention discloses an LED dimming circuit, a device and electronic equipment, wherein the LED dimming circuit comprises a signal input circuit, a signal configuration circuit, an isolation circuit, a voltage setting circuit and a power setting circuit; the first end of the signal input circuit is used for being connected with a signal end and used for ensuring that an input dimming signal is a safety signal; the first end of the signal configuration circuit is connected with the second end of the signal input circuit and is used for adjusting the voltage amplitude of the dimming signal; the first end of the isolation circuit is connected with the second end of the signal configuration circuit and is used for converting the electric signal of the adjusted dimming signal into an optical signal and then into a voltage signal; the first end of the voltage setting circuit is connected with the second end of the isolation circuit and is used for adjusting the input of the power setting circuit; the power setting circuit is connected with the second end of the isolation circuit and is used for adjusting the output voltage and the setting of the output power.
Description
Technical Field
The present invention relates to the field of LED dimming technologies, and in particular, to an LED dimming circuit, an LED dimming device, and an electronic device.
Background
As LED dimming technology is becoming mature, LED fixtures are becoming popular with a wide range of users. In the prior art, although the driving power supply can realize the traditional silicon controlled rectifier dimming and 0-10v dimming interfaces; but this power driver chip needs to support both thyristor dimming and PWM or I2C interfaces, which presents a significant challenge for the IC vendor.
Disclosure of Invention
The invention mainly aims to provide an LED dimming circuit, an LED dimming device and electronic equipment, and aims to improve LED dimming compatibility.
In order to achieve the above object, the present invention provides an LED dimming circuit, which includes a signal input circuit, a signal configuration circuit, an isolation circuit, a voltage setting circuit, and a power setting circuit;
the first end of the signal input circuit is used for being connected with a signal end and used for ensuring that an input dimming signal is a safety signal; the first end of the signal configuration circuit is connected with the second end of the signal input circuit and is used for adjusting the voltage amplitude of the dimming signal; the first end of the isolation circuit is connected with the second end of the signal configuration circuit and is used for converting the electric signal of the adjusted dimming signal into an optical signal and then into a voltage signal, and the voltage signal are respectively used as control input signals of the voltage setting circuit and the power setting circuit; the first end of the voltage setting circuit is connected with the second end of the isolation circuit and is used for adjusting the input of the power setting circuit; the power setting circuit is connected with the second end of the isolation circuit and is used for adjusting the output voltage and the setting of the output power.
Preferably, the isolation circuit includes a current-guiding diode and an optocoupler, a first pin of the optocoupler is connected with the second end of the signal configuration circuit, a second pin of the optocoupler is grounded, and a third pin of the optocoupler is connected with a cathode of the current-guiding diode.
Preferably, the voltage setting circuit includes a first current limiting resistor, a first voltage stabilizing tube, a second voltage stabilizing tube and a load resistor, wherein a first end of the first current limiting resistor is connected with an IC power supply end, a second end of the first current limiting resistor is connected with an anode of the current guiding diode and a cathode of the first voltage stabilizing tube respectively, a first end of the load resistor is connected with a fourth pin of the optical coupler, and an anode of the first voltage stabilizing tube is connected with a second end of the load resistor and a cathode of the second voltage stabilizing tube respectively.
Preferably, the power setting circuit comprises a voltage setting sub-circuit and a power setting sub-circuit, wherein a first end of the voltage setting sub-circuit is connected with a second end of the first current limiting resistor, and a second end of the voltage setting sub-circuit is connected with a third pin of the optocoupler; the first ends of the power setting sub-circuits are respectively connected with the first ends of the load resistors and are used for adjusting the input of the power setting sub-circuits through the voltage setting circuit.
Preferably, the power setting sub-circuit includes a power adjusting resistor and a power adjusting MOS tube, a first end of the power adjusting resistor is connected to the IC power adjusting end, a second end of the power adjusting resistor is connected to a drain electrode of the power adjusting MOS tube, a source electrode of the power adjusting MOS tube is grounded, and a gate electrode of the power adjusting MOS tube is connected to the first end of the load resistor.
Preferably, the voltage setting sub-circuit includes an output voltage adjusting resistor, a voltage adjusting MOS tube, an upper bias resistor, a lower bias resistor, a detection triode and a second current limiting resistor, wherein a first end of the output voltage adjusting resistor is connected with an output voltage adjusting end of the IC FB, a second end of the output voltage adjusting resistor is connected with a drain electrode of the voltage adjusting MOS tube, a source electrode of the voltage adjusting MOS tube is grounded, a grid electrode of the voltage adjusting MOS tube is respectively connected with the second end of the upper bias resistor and the first end of the lower bias resistor, a second end of the lower bias resistor is grounded, a first end of the upper bias resistor is connected with a collector electrode of the detection triode, a base electrode of the detection triode is connected with a first end of the second current limiting resistor, an emitter electrode of the detection triode is connected with a second end of the first current limiting resistor, and a second end of the second current limiting resistor is connected with a third pin of the optocoupler.
Preferably, the signal configuration circuit includes a first filter capacitor, a second filter capacitor, a third current-limiting resistor, a fourth current-limiting resistor, a fifth current-limiting resistor, a third voltage-stabilizing tube and a fourth voltage-stabilizing tube, wherein a first end of the third current-limiting resistor is respectively connected with a first pin of the optical coupler and a first end of the first filter capacitor, a second end of the first filter capacitor is grounded, a second end of the third current-limiting resistor is respectively connected with a second end of the fifth current-limiting resistor and a cathode of the fourth voltage-stabilizing tube, a first end of the fifth current-limiting resistor is connected with a positive end of a power supply, a first end of the fourth current-limiting resistor is connected with an anode of the fourth voltage-stabilizing tube, a cathode of the third voltage-stabilizing tube and a first end of the second filter capacitor, an anode of the third voltage-stabilizing tube is grounded, and a second end of the second filter capacitor is grounded.
Preferably, the signal input circuit comprises a self-recovery fuse and a high-voltage bleeder tube, wherein a first end of the self-recovery fuse is connected with the signal end, a second end of the self-recovery fuse is connected with the first end of the high-voltage bleeder tube, and a second end of the high-voltage bleeder tube is used for being connected with a signal ground.
In order to achieve the above object, the present invention further provides an LED dimming device, which includes the LED dimming circuit described above.
In order to achieve the above purpose, the invention also provides an electronic device, which comprises the LED dimming device.
According to the technical scheme, the dimming signal is input from the signal input circuit, the input signal is ensured to be a safe signal, the amplitude of the signal is rearranged through the signal configuration circuit, the electric signal is converted into the optical signal through the isolation circuit and then is converted into the voltage signal, the voltage signal is respectively used as the control input signals of the voltage setting circuit and the power setting circuit, the voltage setting circuit is used for adjusting the input of the power setting circuit, and the setting of the output voltage and the output power is adjusted through the power setting circuit, so that the compatibility of the dimming circuit is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a functional block diagram of an embodiment of an LED dimming circuit according to the present invention;
fig. 2 is a schematic circuit diagram of an LED dimming circuit according to another embodiment of the present invention.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described 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 noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides an LED dimming circuit.
Referring to fig. 1 and 2, in an embodiment of the present invention, the LED dimming circuit includes a signal input circuit 110, a signal configuration circuit 120, an isolation circuit 130, a voltage setting circuit 140, and a power setting circuit 150; the first end of the signal input circuit 110 is used for connecting a signal end and ensuring that an input dimming signal is a safety signal; the first end of the signal configuration circuit 120 is connected to the second end of the signal input circuit 110, and is used for adjusting the voltage amplitude of the dimming signal; the first end of the isolation circuit 130 is connected to the second end of the signal configuration circuit 120, and is configured to convert the electrical signal of the adjusted dimming signal into an optical signal, and then into a voltage signal, which is used as the control input signals of the voltage setting circuit 140 and the power setting circuit 150, respectively; a first terminal of the voltage setting circuit 140 is connected to a second terminal of the isolation circuit 130, for adjusting an input of the power setting circuit 150; the power setting circuit 150 is connected to the second terminal of the isolation circuit 130, and is used for adjusting the output voltage and the setting of the output power.
The invention inputs the dimming signal from the signal input circuit 110 to ensure that the input signal is a safe signal, then the amplitude of the signal is rearranged by the signal configuration circuit 120, the electric signal is converted into an optical signal by the isolation circuit 130, then the optical signal is converted into a voltage signal, the voltage signal is respectively used as control input signals of the voltage setting circuit 140 and the power setting circuit 150, the voltage setting circuit 140 is used for adjusting the input of the power setting circuit 150, and the power setting circuit 150 is used for adjusting the setting of the output voltage and the output power, thereby improving the compatibility of the dimming circuit.
Specifically, the isolation circuit 130 includes a current-guiding diode D1 and an optocoupler U1, a first pin of the optocoupler U1 is connected to the second end of the signal configuration circuit 120, a second pin of the optocoupler U1 is grounded, and a third pin of the optocoupler U1 is connected to the cathode of the current-guiding diode D1. The isolation circuit 130 converts the electrical signal into an optical signal and then into a voltage signal, so as to avoid the situation that the power supply cannot be shared due to too great power supply level difference on both sides of the circuit. The purpose of the steering diode D1 is to bias the optocoupler U1 with a regulated voltage of the voltage setting circuit 140 (specifically, the cathode of the first regulator tube D11 described below). The increased arrangement of optocoupler U1 further improves the versatility of the circuit, so that the voltage of the whole circuit remains consistent, and the circuit internal parameters are not greatly reduced under the condition of changing.
Further, the voltage setting circuit 140 includes a first current limiting resistor R11, a first voltage stabilizing tube D11, a second voltage stabilizing tube D12, and a load resistor R16, where a first end of the first current limiting resistor R11 is connected to the IC power supply end, a second end of the first current limiting resistor R11 is connected to an anode of the current guiding diode D1 and a cathode of the first voltage stabilizing tube D11, a first end of the load resistor R16 is connected to a fourth pin of the optocoupler U1, and an anode of the first voltage stabilizing tube D11 is connected to a second end of the load resistor R16 and a cathode of the second voltage stabilizing tube D12, so that an output current of the fourth pin of the optocoupler U1 is converted to a voltage on the load resistor R16. The first current-limiting resistor R11, the first voltage stabilizing tube D11 and the second voltage stabilizing tube D12 form a voltage stabilizing circuit, and a reference voltage is provided on the cathode of the second voltage stabilizing tube D12. The first voltage stabilizing tube D11 and the second voltage stabilizing tube D12 are connected in series, so that the power consumption of the IC sampling current can be reduced, and the compatibility of the circuit is further improved.
Specifically, the power setting circuit 150 includes a voltage setting sub-circuit 151 and a power setting sub-circuit 152, a first end of the voltage setting sub-circuit 151 is connected to a second end of the first current limiting resistor R11, and a second end of the voltage setting sub-circuit 151 is connected to a third pin of the optocoupler U1; the first terminals of the power setting sub-circuits 152 are respectively connected to the first terminals of the load resistors R16, and are used for adjusting the input of the power setting sub-circuits 152 through the voltage setting circuit 140.
Specifically, the power setting sub-circuit 152 includes a power adjusting resistor R17 and a power adjusting MOS tube U3, a first end of the power adjusting resistor R17 is connected to the IC power adjusting end, a second end of the power adjusting resistor R17 is connected to a drain electrode of the power adjusting MOS tube U3, a source electrode of the power adjusting MOS tube U3 is grounded, and a gate electrode of the power adjusting MOS tube U3 is connected to the first end of the load resistor R16. The first current-limiting resistor R11, the first voltage-stabilizing tube D11 and the second voltage-stabilizing tube D12 form a voltage-stabilizing circuit, and a reference voltage is provided on the cathode of the second voltage-stabilizing tube D12, and is the starting point voltage value of the linear adjusting section of the power adjusting MOS tube U3. The output current of the fourth pin of the optocoupler U1 is converted into voltage on the load resistor R16, and then the voltage is provided for the power adjustment MOS tube U3.
Specifically, the voltage setting subcircuit 151 includes an output voltage adjusting resistor R18, a voltage adjusting MOS U2, an upper bias resistor R19, a lower bias resistor R20, a detection triode Q1 and a second current limiting resistor R12, wherein a first end of the output voltage adjusting resistor R18 is connected to an output voltage adjusting end of the IC FB, a second end of the output voltage adjusting resistor R18 is connected to a drain of the voltage adjusting MOS U2, a source electrode of the voltage adjusting MOS U2 is grounded, a gate electrode of the voltage adjusting MOS U2 is respectively connected to a second end of the upper bias resistor R19 and a first end of the lower bias resistor R20, a second end of the lower bias resistor R20 is grounded, a first end of the upper bias resistor R19 is connected to a collector electrode of the detection triode Q1, a base electrode of the detection triode Q1 is connected to a first end of the second current limiting resistor R12, an emitter of the detection triode Q1 is connected to a second end of the first current limiting resistor R11, and a second end of the second current limiting resistor R12 is connected to a third pin of the optical coupler U1. The detection circuit formed by the second current limiting resistor R12 and the detection triode Q1 detects whether the input amplitude of the dimming signal reaches a set value, when the input signal amplitude is in a normal range, the detection triode Q1 outputs a high level, and when the input dimming signal amplitude is lower than the set value, the detection triode Q1 does not output. The upper bias resistor R19 and the lower bias resistor R20 provide bias voltages for the voltage adjustment MOS tube U2. The output voltage adjusting resistor R18 is a load of the voltage adjusting MOS transistor U2. When the detection triode Q1 outputs a high level, the voltage adjustment MOS tube U2 is conducted to work, and the output voltage adjustment resistor R18 is connected to the ground. The output voltage regulating terminal pin of the IC FB is integrated with the output voltage regulating resistor R18, so that the output voltage value of the classical power supply is increased to the normal output voltage. And when the detection triode Q1 does not output, the classical power supply output is lower than the load working voltage. The load is not operating.
Specifically, the signal configuration circuit 120 includes a first filter capacitor C1, a second filter capacitor C2, a third current-limiting resistor R13, a fourth current-limiting resistor R14, a fifth current-limiting resistor R15, a third voltage-stabilizing tube D13, and a fourth voltage-stabilizing tube D14, where a first end of the third current-limiting resistor R13 is connected to a first pin of the optical coupler U1 and a first end of the first filter capacitor C1, a second end of the first filter capacitor C1 is grounded, a second end of the third current-limiting resistor R13 is connected to a second end of the fifth current-limiting resistor R15 and a cathode of the fourth voltage-stabilizing tube D14, a first end of the fifth current-limiting resistor R15 is connected to a positive end of the power supply, a first end of the fourth current-limiting resistor R14 is connected to an anode of the fourth voltage-stabilizing tube D14, a cathode of the third voltage-stabilizing tube D13 and a first end of the second filter capacitor C2 are connected to a second end of the third voltage-stabilizing tube D13, and a second end of the second filter capacitor C2 is grounded. The fourth current limiting resistor R14 and the third voltage stabilizing tube D13 form a reference voltage setting circuit 140 of signal ground, and by using the reference circuit, the dimming voltage of the dimming signal can be enabled to start working at any voltage value of 0-10V, and the circuit is not required to have trigger voltage limitation (trigger voltage is less than 0.2V and more than 1V) like the dimming power supply in the market, so that the compatibility of the circuit is further improved. The reference voltage setting value is conducted to the first end of the third current limiting resistor R13 through the fourth voltage stabilizing tube D14, wherein the fourth voltage stabilizing tube D14 and the signal input circuit 110 can also play a role in voltage stabilization when combined together. In this embodiment, the resistance setting factor of the third current limiting resistor R13 is generally the amplitude of the dimming signal divided by the driving current (optocoupler control current) of the optocoupler U1, and the optocoupler control current is controlled by the linear operating voltage of the MOS transistors (the voltage adjusting MOS transistor U2 and the power adjusting MOS transistor U3). And when no control signal is formed or the fifth current limiting resistor R15 and the fourth voltage stabilizing tube D14 are not connected, the power supply outputs the maximum power circuit. And when the circuit is not accessed, normal operation of other dimming or non-dimming circuits is not blocked, and compatibility is improved. Meanwhile, the fourth voltage stabilizing tube D14 also plays a signal voltage limiting function, and when the voltage of different dimmers exceeds a set value, the highest input voltage is stabilized.
Specifically, the signal input circuit 110 includes a self-recovery fuse RT1 and a high-voltage bleeder tube D2, a first end of the self-recovery fuse RT1 is connected to a signal end, a second end of the self-recovery fuse RT1 is connected to a first end of the high-voltage bleeder tube D2, and a second end of the high-voltage bleeder tube D2 is connected to a signal ground. Specifically, a first end of the high-voltage discharging tube D2 is connected to the cathode of the fourth voltage stabilizing tube D14, and a second end of the high-voltage discharging tube D2 is connected to the anode of the fourth voltage stabilizing tube D14. The positive end of the power supply and the auxiliary ground end of the transformer form an independent power supply which is safely isolated from other circuit units. The dimming signal reaches the two ends of the high-voltage discharge tube D2 and the fourth voltage stabilizing tube D14 through the self-recovery fuse RT1, the self-recovery fuse RT1 and the high-voltage discharge tube D2 form a signal misconnection protection circuit, if the signal wire is connected to 220V mains supply or reversely, the high-voltage discharge tube D2 is conducted, and when the current exceeds the working current of the self-recovery fuse RT1, the self-recovery fuse RT1 is disconnected for protection so as to ensure that the input signal is a safety signal; when the circuit returns to normal, the RT1 self-recovery fuse RT1 automatically returns to normal.
The invention also provides an LED dimming device, which comprises the LED dimming circuit, and the specific structure of the LED dimming circuit refers to the embodiment, and because the LED dimming device adopts all the technical schemes of all the embodiments, the LED dimming device at least has all the beneficial effects brought by the technical schemes of the embodiments, and the detailed description is omitted.
The invention also provides an electronic device, which comprises the LED dimming device, and the specific structure of the LED dimming device refers to the embodiment, and because the electronic device adopts all the technical schemes of all the embodiments, the electronic device at least has all the beneficial effects brought by the technical schemes of the embodiments, and the detailed description is omitted.
The electronic device may be a household appliance, such as an LED lamp or the like.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (5)
1. An LED dimming circuit is characterized by comprising a signal input circuit, a signal configuration circuit, an isolation circuit, a voltage setting circuit and a power setting circuit;
the first end of the signal input circuit is used for being connected with a signal end and used for ensuring that an input dimming signal is a safety signal; the first end of the signal configuration circuit is connected with the second end of the signal input circuit and is used for adjusting the voltage amplitude of the dimming signal; the first end of the isolation circuit is connected with the second end of the signal configuration circuit and is used for converting the electric signal of the adjusted dimming signal into an optical signal and then into a voltage signal, and the voltage signal are respectively used as control input signals of the voltage setting circuit and the power setting circuit; the first end of the voltage setting circuit is connected with the second end of the isolation circuit and is used for adjusting the input of the power setting circuit; the power setting circuit is connected with the second end of the isolation circuit and is used for adjusting the output voltage and the setting of the output power;
the isolation circuit comprises a flow guide diode and an optical coupler, wherein a first pin of the optical coupler is connected with a second end of the signal configuration circuit, a second pin of the optical coupler is grounded, and a third pin of the optical coupler is connected with a cathode of the flow guide diode;
the voltage setting circuit comprises a first current limiting resistor, a first voltage stabilizing tube, a second voltage stabilizing tube and a load resistor, wherein a first end of the first current limiting resistor is used for being connected with an IC power supply end, a second end of the first current limiting resistor is respectively connected with an anode of the flow guiding diode and a cathode of the first voltage stabilizing tube, a first end of the load resistor is connected with a fourth pin of the optical coupler, and an anode of the first voltage stabilizing tube is respectively connected with a second end of the load resistor and a cathode of the second voltage stabilizing tube;
the power setting circuit comprises a voltage setting sub-circuit and a power setting sub-circuit, wherein a first end of the voltage setting sub-circuit is connected with a second end of the first current limiting resistor, and a second end of the voltage setting sub-circuit is connected with a third pin of the optocoupler; the first end of the power setting sub-circuit is respectively connected with the first end of the load resistor and is used for adjusting the input of the power setting sub-circuit through the voltage setting circuit;
the signal configuration circuit comprises a first filter capacitor, a second filter capacitor, a third current-limiting resistor, a fourth current-limiting resistor, a fifth current-limiting resistor, a third voltage-stabilizing tube and a fourth voltage-stabilizing tube, wherein the first end of the third current-limiting resistor is respectively connected with a first pin of the optical coupler and the first end of the first filter capacitor, the second end of the first filter capacitor is grounded, the second end of the third current-limiting resistor is respectively connected with the second end of the fifth current-limiting resistor and the cathode of the fourth voltage-stabilizing tube, the first end of the fifth current-limiting resistor is connected with the positive end of a power supply, the first end of the fourth current-limiting resistor is connected with the positive end of the power supply, the second end of the fourth current-limiting resistor is respectively connected with the anode of the fourth voltage-stabilizing tube, the cathode of the third voltage-stabilizing tube and the first end of the second filter capacitor, the anode of the third voltage-stabilizing tube is grounded, and the second end of the second filter capacitor is grounded;
the signal input circuit comprises a self-recovery fuse and a high-voltage discharge tube, wherein the first end of the self-recovery fuse is connected with the signal end, the second end of the self-recovery fuse is connected with the first end of the high-voltage discharge tube, and the second end of the high-voltage discharge tube is used for being connected with signal ground.
2. The LED dimmer circuit of claim 1, wherein the power setting subcircuit comprises a power adjustment resistor and a power adjustment MOS transistor, wherein a first end of the power adjustment resistor is configured to be connected to the IC power adjustment end, a second end of the power adjustment resistor is configured to be connected to a drain of the power adjustment MOS transistor, a source of the power adjustment MOS transistor is connected to ground, and a gate of the power adjustment MOS transistor is configured to be connected to the first end of the load resistor.
3. The LED dimming circuit of claim 1, wherein the voltage setting subcircuit comprises an output voltage adjusting resistor, a voltage adjusting MOS tube, an upper bias resistor, a lower bias resistor, a detection triode and a second current limiting resistor, wherein a first end of the output voltage adjusting resistor is connected with an IC FB output voltage adjusting end, a second end of the output voltage adjusting resistor is connected with a drain electrode of the voltage adjusting MOS tube, a source electrode of the voltage adjusting MOS tube is grounded, a grid electrode of the voltage adjusting MOS tube is respectively connected with a second end of the upper bias resistor and a first end of the lower bias resistor, a second end of the lower bias resistor is grounded, a first end of the upper bias resistor is connected with a collector electrode of the detection triode, a base electrode of the detection triode is connected with a first end of the second current limiting resistor, an emitter electrode of the detection triode is connected with a second end of the first current limiting resistor, and a second end of the second current limiting resistor is connected with a third pin of the optocoupler.
4. An LED dimming device, characterized in that the LED dimming device comprises an LED dimming circuit according to any one of claims 1 to 3.
5. An electronic device comprising the LED dimming device of claim 4.
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| CN201811092032.3A CN108990221B (en) | 2018-09-19 | 2018-09-19 | LED dimming circuit, device and electronic equipment |
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| CN201811092032.3A CN108990221B (en) | 2018-09-19 | 2018-09-19 | LED dimming circuit, device and electronic equipment |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101754526A (en) * | 2009-12-17 | 2010-06-23 | 浙江大学 | Digital dimming device and digital dimming method |
| CN201805579U (en) * | 2010-02-11 | 2011-04-20 | 英飞特电子（杭州）有限公司 | Dimming control circuit suitable for leading edge dimmer and/or trailing edge dimmer of LED |
| US7952297B2 (en) * | 2007-07-27 | 2011-05-31 | Rohm Co., Ltd. | Driving device for providing light dimming control of light-emitting element |
| CN106231737A (en) * | 2016-09-12 | 2016-12-14 | 惠州Tcl照明电器有限公司 | PWM isolation light adjusting circuit and LED dimming drive power |
| CN106793293A (en) * | 2016-12-22 | 2017-05-31 | 惠州Tcl照明电器有限公司 | Light modulating device and LED dimming drive powers |
| CN209375971U (en) * | 2018-09-19 | 2019-09-10 | 深圳益明光电技术有限公司 | LED light adjusting circuit, device and electronic equipment |
-
2018
- 2018-09-19 CN CN201811092032.3A patent/CN108990221B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7952297B2 (en) * | 2007-07-27 | 2011-05-31 | Rohm Co., Ltd. | Driving device for providing light dimming control of light-emitting element |
| CN101754526A (en) * | 2009-12-17 | 2010-06-23 | 浙江大学 | Digital dimming device and digital dimming method |
| CN201805579U (en) * | 2010-02-11 | 2011-04-20 | 英飞特电子（杭州）有限公司 | Dimming control circuit suitable for leading edge dimmer and/or trailing edge dimmer of LED |
| CN106231737A (en) * | 2016-09-12 | 2016-12-14 | 惠州Tcl照明电器有限公司 | PWM isolation light adjusting circuit and LED dimming drive power |
| CN106793293A (en) * | 2016-12-22 | 2017-05-31 | 惠州Tcl照明电器有限公司 | Light modulating device and LED dimming drive powers |
| CN209375971U (en) * | 2018-09-19 | 2019-09-10 | 深圳益明光电技术有限公司 | LED light adjusting circuit, device and electronic equipment |
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|---|---|
| CN108990221A (en) | 2018-12-11 |
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