CN107787092B - Constant voltage dimming four-in-one circuit and method thereof - Google Patents
Constant voltage dimming four-in-one circuit and method thereof Download PDFInfo
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- CN107787092B CN107787092B CN201711178202.5A CN201711178202A CN107787092B CN 107787092 B CN107787092 B CN 107787092B CN 201711178202 A CN201711178202 A CN 201711178202A CN 107787092 B CN107787092 B CN 107787092B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims abstract description 24
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 16
- 239000010703 silicon Substances 0.000 claims abstract description 16
- 230000007423 decrease Effects 0.000 claims description 15
- 238000004804 winding Methods 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides a constant voltage dimming four-in-one circuit, which comprises an AC input power supply circuit; a capacitor C1 connected to the AC input power circuit; resistors R1, R2, R3 and R4 connected to the capacitor C1; a pulse width modulation circuit U1 connected to the capacitor C1; and the silicon controlled rectifier dimming circuit is connected with the pulse width modulation circuit U1. The scheme uses the simplest mode to uniformly convert four dimming modes into pwm dimming, and solves the problem of the traditional method of controlling dimming by adopting a CPU.
Description
Technical Field
The invention relates to the field of circuits, in particular to a constant voltage dimming four-in-one circuit.
Background
The conventional constant voltage dimming circuit generally generates a sawtooth wave Vc with a 1000Hz amplitude of about 9.5V from U4A, U B and U3, and detects the conduction angle of the input voltage from R1, R2, R3, R4, and C2. When the dimming is not performed, the potential of Va is about 10.5V when the dimming is performed from U2 to the secondary side, the potential of Ub point is about 10V, at the moment, vb is larger than Vc, U4C outputs high level, Q1 is completely conducted, and the power supply works in a mode that the duty ratio is 100%. However, the conventional constant voltage dimming circuit can be modulated only in one mode, is generally controlled by a CPU, and is simpler and has fewer functions.
Disclosure of Invention
Based on this, it is necessary to provide a constant voltage dimming four-in-one circuit.
A constant voltage dimming four-in-one circuit, the four-in-one circuit comprising:
an AC input power circuit;
a capacitor C1 connected to the AC input power circuit;
Resistors R1, R2, R3 and R4 connected to the capacitor C1;
a pulse width modulation circuit U1 connected to the capacitor C1;
and the silicon controlled rectifier dimming circuit is connected with the pulse width modulation circuit U1.
In one embodiment, the four-in-one circuit further comprises:
and the linear dimmer is connected with the silicon controlled rectifier dimming circuit and is used for linearly dimming the circuit.
In one embodiment, the four-in-one circuit further comprises:
and the winding T1 is connected with the linear dimmer and is used for carrying out impedance coupling on the linear dimmer.
In one embodiment, the four-in-one circuit further comprises:
And the first differential amplifier is connected with the winding T1 and is used for amplifying the dimming signal for the first time.
In one embodiment, the four-in-one circuit further comprises:
And the second differential amplifier is connected with the first differential amplifier and is used for amplifying the dimming signal for the second time.
In one embodiment, the four-in-one circuit further comprises:
and the triode Q1 is connected between the winding T1 and the first differential amplifier.
In one embodiment, the second differential amplifier is a differential common mode amplifier.
A method for implementing a constant voltage dimming four-in-one circuit, the method further comprising:
Providing an AC input power circuit;
Controlling the AC input power supply circuit to be connected with a capacitor C1;
Controlling the capacitor C1 to be connected with the resistors R1, R2, R3 and R4;
the capacitor C1 is controlled to be connected to the pulse width modulation circuit U1;
And the silicon controlled rectifier dimming circuit is used for controlling the connection of the pulse width modulation circuit U1.
In one embodiment, the method further comprises:
And a linear dimmer is provided, and is connected with the silicon controlled rectifier dimming circuit and used for linearly dimming the circuit.
In one embodiment, the method further comprises:
a winding T1 is provided in connection with the linear dimmer for impedance coupling the linear dimmer.
The beneficial effects are that:
The invention provides a constant voltage dimming four-in-one circuit, which comprises an AC input power supply circuit; a capacitor C1 connected to the AC input power circuit; resistors R1, R2, R3 and R4 connected to the capacitor C1; a pulse width modulation circuit U1 connected to the capacitor C1; and the silicon controlled rectifier dimming circuit is connected with the pulse width modulation circuit U1. The scheme uses the simplest mode to uniformly convert four dimming modes into pwm dimming, and solves the problem of the traditional method of controlling dimming by adopting a CPU.
Drawings
Fig. 1 is a schematic circuit diagram of a constant voltage dimming four-in-one circuit.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a constant voltage dimming four-in-one circuit includes:
an AC input power circuit;
a capacitor C1 connected to the AC input power circuit;
Resistors R1, R2, R3 and R4 connected to the capacitor C1;
a pulse width modulation circuit U1 connected to the capacitor C1;
and the silicon controlled rectifier dimming circuit is connected with the pulse width modulation circuit U1.
In one embodiment, the four-in-one circuit further comprises:
and the linear dimmer is connected with the silicon controlled rectifier dimming circuit and is used for linearly dimming the circuit.
In one embodiment, the four-in-one circuit further comprises:
and the winding T1 is connected with the linear dimmer and is used for carrying out impedance coupling on the linear dimmer.
In one embodiment, the four-in-one circuit further comprises:
And the first differential amplifier is connected with the winding T1 and is used for amplifying the dimming signal for the first time.
In one embodiment, the four-in-one circuit further comprises:
And the second differential amplifier is connected with the first differential amplifier and is used for amplifying the dimming signal for the second time.
In one embodiment, the four-in-one circuit further comprises:
and the triode Q1 is connected between the winding T1 and the first differential amplifier.
In one embodiment, the second differential amplifier is a differential common mode amplifier.
It should be noted that, in this scheme, a sawtooth wave Vc with a 1000Hz amplitude of about 9.5V is mainly generated by U4A, U B and U3, and the conduction angles of the input voltages are detected by R1, R2, R3, R4, and C2. When the dimming is not performed, the potential of Va is about 10.5V when the dimming is performed from U2 to the secondary side, the potential of Ub point is about 10V, at the moment, vb is larger than Vc, U4C outputs high level, Q1 is completely conducted, and the power supply works in a mode that the duty ratio is 100%.
In one embodiment, when the thyristor is dimmed, the potential at Va decreases as the conduction angle decreases. As shown in the following figure, the duty cycle of Vd decreases with decreasing conduction angle, i.e., the duty cycle of Q1 conduction decreases and the output duty cycle decreases.
When the thyristor is not connected with the DIM and the DIM-is connected with the 0-10V dimmer, the potential of Vb is vb= Udim +0.5V. As Udim decreases, the output duty cycle decreases.
When the silicon controlled rectifier is not connected with the dimming, the DIM+ and the DIM are connected with PWM signals with the amplitude of 10V, the potential of Vb is a pulse signal of PWM, the potential of Vd is a PWM signal, and the output is the duty ratio of PWM.
When the thyristor is not connected, the dim+ and DIM-line dimmer, the potential of Vb decreases and the duty cycle of the output decreases as the resistance of the linear dimmer decreases.
To sum up: the scheme uses the simplest mode to uniformly convert four dimming modes into pwm dimming. The traditional method for controlling dimming by adopting the CPU is solved.
The invention provides a constant voltage dimming four-in-one circuit, which comprises an AC input power supply circuit; a capacitor C1 connected to the AC input power circuit; resistors R1, R2, R3 and R4 connected to the capacitor C1; a pulse width modulation circuit U1 connected to the capacitor C1; and the silicon controlled rectifier dimming circuit is connected with the pulse width modulation circuit U1. The scheme uses the simplest mode to uniformly convert four dimming modes into pwm dimming, and solves the problem of the traditional method of controlling dimming by adopting a CPU.
A method for implementing a constant voltage dimming four-in-one circuit, the method further comprising:
Providing an AC input power circuit;
Controlling the AC input power supply circuit to be connected with a capacitor C1;
Controlling the capacitor C1 to be connected with the resistors R1, R2, R3 and R4;
the capacitor C1 is controlled to be connected to the pulse width modulation circuit U1;
And the silicon controlled rectifier dimming circuit is used for controlling the connection of the pulse width modulation circuit U1.
In one embodiment, the method further comprises:
And a linear dimmer is provided, and is connected with the silicon controlled rectifier dimming circuit and used for linearly dimming the circuit.
In one embodiment, the method further comprises:
a winding T1 is provided in connection with the linear dimmer for impedance coupling the linear dimmer.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (1)
1. The implementation method of the constant voltage dimming four-in-one circuit is characterized by comprising the following steps of:
Providing an AC input power circuit;
Controlling the AC input power supply circuit to be connected with a capacitor C1;
Controlling the capacitor C1 to be connected with the resistors R1, R2, R3 and R4;
the capacitor C1 is controlled to be connected to the pulse width modulation circuit U1;
A silicon controlled rectifier dimming circuit connected with the pulse width modulation circuit U1 is controlled;
providing a linear dimmer connected with the silicon controlled rectifier dimming circuit and used for linearly dimming the circuit;
providing a winding T1 connected with the linear dimmer and used for carrying out impedance coupling on the linear dimmer;
the first differential amplifier is connected with the winding T1 and is used for amplifying the dimming signal for the first time;
The second differential amplifier is connected with the first differential amplifier and is used for amplifying the dimming signal for the second time;
A triode Q1, wherein the triode Q1 is connected between the winding T1 and the first differential amplifier;
the second differential amplifier is a differential common mode amplifier;
when the silicon controlled rectifier is not connected with the light modulator, the DIM+ and the DIM-are connected with the light modulator with 0-10V, the potential of Vb is vb= Udim +0.5V; as Udim decreases, the output duty cycle decreases;
When the silicon controlled rectifier is not connected with the dimming, the DIM+ and the DIM are connected with PWM signals with the amplitude of 10V, the potential of Vb is a pulse signal of PWM, the potential of Vd is a PWM signal, and the output is the duty ratio of PWM;
when the thyristor is not connected, the dim+ and DIM-line dimmer, the potential of Vb decreases and the duty cycle of the output decreases as the resistance of the linear dimmer decreases.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711178202.5A CN107787092B (en) | 2017-11-23 | 2017-11-23 | Constant voltage dimming four-in-one circuit and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711178202.5A CN107787092B (en) | 2017-11-23 | 2017-11-23 | Constant voltage dimming four-in-one circuit and method thereof |
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| Publication Number | Publication Date |
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| CN107787092A CN107787092A (en) | 2018-03-09 |
| CN107787092B true CN107787092B (en) | 2024-05-07 |
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| CN108419338B (en) * | 2018-04-25 | 2024-02-13 | 深圳民爆光电股份有限公司 | Four-in-one LED constant current dimming driving circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951708A (en) * | 2009-07-10 | 2011-01-19 | 深圳比亚迪微电子有限公司 | Light modulating control circuit, chip and method |
| CN103648219A (en) * | 2013-12-19 | 2014-03-19 | 上海莱托思电子科技有限公司 | Light-emitting diode (LED) switch constant-current driving circuit |
| CN207783202U (en) * | 2017-11-23 | 2018-08-28 | 广东新昇电业科技股份有限公司 | A kind of constant pressure light modulation quadruple circuit |
-
2017
- 2017-11-23 CN CN201711178202.5A patent/CN107787092B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951708A (en) * | 2009-07-10 | 2011-01-19 | 深圳比亚迪微电子有限公司 | Light modulating control circuit, chip and method |
| CN103648219A (en) * | 2013-12-19 | 2014-03-19 | 上海莱托思电子科技有限公司 | Light-emitting diode (LED) switch constant-current driving circuit |
| CN207783202U (en) * | 2017-11-23 | 2018-08-28 | 广东新昇电业科技股份有限公司 | A kind of constant pressure light modulation quadruple circuit |
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| CN107787092A (en) | 2018-03-09 |
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