CN210579339U - Dimming circuit capable of simply setting initial current and adjusting initial current - Google Patents
Dimming circuit capable of simply setting initial current and adjusting initial current Download PDFInfo
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- CN210579339U CN210579339U CN201921582549.0U CN201921582549U CN210579339U CN 210579339 U CN210579339 U CN 210579339U CN 201921582549 U CN201921582549 U CN 201921582549U CN 210579339 U CN210579339 U CN 210579339U
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Abstract
The utility model discloses a can simply set for initial current and to initial current adjustable dimmer circuit, including resistance R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, electric capacity C1, C2, C3, diode D1, D2, D3, D4, D5, D6, D7, amplifier X1, X2, triode Q1, Q2, Q3, power supply V1, V2, triangular wave signal Tri, input signal X1-inn, voltage signal V0, Vi and Vi 2. Has the advantages that: the double-path operational amplifier is adopted, the initial current of the power supply is set through the adjustable resistor, the set current is adjusted through the external light adjusting signal, the initial current of the power supply can be set, the set current can be adjusted, the cost is low, the adjusting precision is high, and the adjustment is simple and convenient.
Description
Technical Field
The utility model relates to a LED power technical field particularly, relates to a can simply set for initial current and to initial current adjustable dimmer circuit.
Background
At present, when the conventional mode is adopted for dimming an LED power supply with constant-current output, if the initial current of the power supply needs to be set, and the current after setting needs to be dimmed, the dimming needs to be realized through an MCU. As shown in the figure6, the default maximum output of the power supply is ImaxThe MCU sets an initial output current I through softwareo' the MCU sets an initial output current I through softwareo’，Io’＝ImaxZ (Z is an initial value set by the MCU, the value range is 0-100%), an externally input dimming signal is processed through AD sampling, a linear adjustable PWM signal is output to realize initial current dimming, and current I after dimmingo＝Io' K (K is the PWM duty ratio output by the MCU, and the value range is 0% -100%), namely the final output current Io＝Imax*Z*K。
In the traditional method, an MCU is used for conversion, the MCU needs an AD conversion circuit and software design, and part of programs need to be changed when the initial current is set every time, so that the operation is time-consuming and the cost is high.
An effective solution to the problems in the related art has not been proposed yet.
SUMMERY OF THE UTILITY MODEL
To the problem among the correlation technique, the utility model provides a can simply set for initial current and to initial current adjustable dimmer circuit to overcome the above-mentioned technical problem that current correlation technique exists.
Therefore, the utility model discloses a specific technical scheme as follows:
a dimming circuit capable of simply setting initial current and adjusting the initial current comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, an adjustable resistor R13, an adjustable resistor R14, a capacitor C1, a capacitor C2, a capacitor C3, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, an amplifier X1, an amplifier X2, a triode Q1, a triode Q2, a triode Q3, a power supply V1, a power supply V2, a triangular wave signal Tri, an input signal X1-inn, a voltage signal V0, a voltage signal Vi and a voltage signal Vi 2;
the voltage signal V0 is sequentially connected to one end of the resistor R6 and the first end of the amplifier X2, the other end of the resistor R6 is sequentially connected to the second end of the amplifier X2, the collector of the transistor Q3, one end of the resistor R5, the anode of the diode D1, one end of the resistor R4, one end of the resistor R3, the anode of the power supply V1, one end of the resistor R2, the second end of the amplifier X1, one end of the resistor R1, the other end of the resistor R3, the cathode of the diode D6, and the cathode of the diode D3, and the cathode of the power supply V1 is grounded;
a third end of the amplifier X2 is sequentially connected to one end of the adjustable resistor R14, one end of the capacitor C2, a negative electrode of the power supply V2, one end of the adjustable resistor R13, one end of the resistor R10, a positive electrode of the diode D6, a third end of the amplifier X1, one end of the capacitor C3, and one end of the resistor R11, and is grounded, and a fourth end of the amplifier X2 is connected to the triangular wave signal Tri;
a fifth end of the amplifier X2 is sequentially connected to the voltage signal Vi2, one end of the resistor R9, and one end of the resistor R12, and the other end of the resistor R12 is connected to the other end of the adjustable resistor R14; the other end of the resistor R9 is sequentially connected with one end of the resistor R8 and the other end of the capacitor C2; the other end of the resistor R8 is sequentially connected with the voltage signal Vi, an emitter of the triode Q3 and the anode of the diode D7; the cathode of the diode D7 is sequentially connected with the anode of the power supply V2, the cathode of the diode D4 and the other end of the adjustable resistor R13; the anode of the diode D4 is sequentially connected with the base of the triode Q3, the collector of the triode Q2 and the anode of the diode D3; an emitter of the triode Q2 is connected with the other end of the resistor R5, and a base of the triode Q2 is sequentially connected with a cathode of the diode D2, a base of the triode Q1 and the other end of the resistor R10; the anode of the diode D2 is connected with the cathode of the diode D1; an emitter of the triode Q1 is connected with the other end of the resistor R4, and a collector of the triode Q1 is sequentially connected with an anode of the diode D5, the other end of the capacitor C3, the triangular wave signal Tri, the input signal X1-inn and a fourth end of the amplifier X1; a cathode of the diode D5 is sequentially connected to a first terminal of the amplifier X1, the other terminal of the resistor R2, one terminal of the capacitor C1, and one terminal of the resistor R7; the other end of the capacitor C1 is sequentially connected to the other end of the resistor R1, the fifth end of the amplifier X1, the other end of the resistor R11 and the other end of the resistor R7.
Further, the diode D6 is a voltage regulator diode, and the model of the diode D6 is BZX 79-10.
Further, the model of the amplifier X1 and the model of the amplifier X2 are both LM 293.
Further, the transistor Q1 and the transistor Q2 are both PNP transistors.
Further, the transistor Q3 is an NPN transistor.
The utility model has the advantages that: the utility model provides a can simply set for initial current and to initial current adjustable dimmer circuit, adopt double-circuit operational amplifier, set for the initial current of power through adjustable resistance, adjust luminance the setting through the current of outside light modulation signal to setting for, can realize that power initial current sets for and to the electric current after setting for adjustable, with low costs, adjust the precision height, adjust portably.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and 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 these drawings without creative efforts.
Fig. 1 is a schematic diagram of a dimming circuit capable of simply setting an initial current and adjusting the initial current according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating an operation of a dimming circuit capable of simply setting an initial current and adjusting the initial current according to an embodiment of the present invention;
fig. 3 is a simulated waveform diagram of a dimming circuit capable of simply setting an initial current and adjusting the initial current according to an embodiment of the present invention;
fig. 4 is a second simulated waveform diagram of a dimming circuit capable of simply setting an initial current and adjusting the initial current according to an embodiment of the present invention;
fig. 5 is a third simulated waveform diagram of a dimming circuit capable of simply setting an initial current and adjusting the initial current according to an embodiment of the present invention;
fig. 6 is a schematic diagram of dimming in the prior art.
Detailed Description
For further explanation of the embodiments, the drawings are provided as part of the disclosure and serve primarily to illustrate the embodiments and, together with the description, to explain the principles of operation of the embodiments, and to provide further explanation of the invention and advantages thereof, it will be understood by those skilled in the art that various other embodiments and advantages of the invention are possible, and that elements in the drawings are not to scale and that like reference numerals are generally used to designate like elements.
According to the utility model discloses an embodiment provides one kind and can simply set for initial current and to initial current adjustable dimmer circuit.
Referring now to the drawings and the detailed description, as shown in fig. 1-5, according to the present invention, a dimmer circuit capable of simply setting an initial current and adjusting the initial current includes a resistor R, an adjustable resistor R, a capacitor C, a diode D, an amplifier X, a triode Q, a power supply V, a triangular wave signal Tri, an input signal X-inn, a voltage signal V, a voltage signal Vi, and a voltage signal Vi;
the voltage signal V0 is sequentially connected to one end of the resistor R6 and the first end of the amplifier X2, the other end of the resistor R6 is sequentially connected to the second end of the amplifier X2, the collector of the transistor Q3, one end of the resistor R5, the anode of the diode D1, one end of the resistor R4, one end of the resistor R3, the anode of the power supply V1, one end of the resistor R2, the second end of the amplifier X1, one end of the resistor R1, the other end of the resistor R3, the cathode of the diode D6, and the cathode of the diode D3, and the cathode of the power supply V1 is grounded;
a third end of the amplifier X2 is sequentially connected to one end of the adjustable resistor R14, one end of the capacitor C2, a negative electrode of the power supply V2, one end of the adjustable resistor R13, one end of the resistor R10, a positive electrode of the diode D6, a third end of the amplifier X1, one end of the capacitor C3, and one end of the resistor R11, and is grounded, and a fourth end of the amplifier X2 is connected to the triangular wave signal Tri;
a fifth end of the amplifier X2 is sequentially connected to the voltage signal Vi2, one end of the resistor R9, and one end of the resistor R12, and the other end of the resistor R12 is connected to the other end of the adjustable resistor R14; the other end of the resistor R9 is sequentially connected with one end of the resistor R8 and the other end of the capacitor C2; the other end of the resistor R8 is sequentially connected with the voltage signal Vi, an emitter of the triode Q3 and the anode of the diode D7; the cathode of the diode D7 is sequentially connected with the anode of the power supply V2, the cathode of the diode D4 and the other end of the adjustable resistor R13; the anode of the diode D4 is sequentially connected with the base of the triode Q3, the collector of the triode Q2 and the anode of the diode D3; an emitter of the triode Q2 is connected with the other end of the resistor R5, and a base of the triode Q2 is sequentially connected with a cathode of the diode D2, a base of the triode Q1 and the other end of the resistor R10; the anode of the diode D2 is connected with the cathode of the diode D1; an emitter of the triode Q1 is connected with the other end of the resistor R4, and a collector of the triode Q1 is sequentially connected with an anode of the diode D5, the other end of the capacitor C3, the triangular wave signal Tri, the input signal X1-inn and a fourth end of the amplifier X1; a cathode of the diode D5 is sequentially connected to a first terminal of the amplifier X1, the other terminal of the resistor R2, one terminal of the capacitor C1, and one terminal of the resistor R7; the other end of the capacitor C1 is sequentially connected to the other end of the resistor R1, the fifth end of the amplifier X1, the other end of the resistor R11 and the other end of the resistor R7.
In one embodiment, for the diode D6 described above, the diode D6 is a zener diode, and the diode D6 is of the type BZX 79-10.
In one embodiment, for the amplifier X1 described above, the model of the amplifier X1 and the model of the amplifier X2 are both LM 293.
In one embodiment, the transistor Q1 and the transistor Q2 are PNP transistors for the transistor Q1.
In one embodiment, the transistor Q3 is an NPN transistor with respect to the transistor Q3 described above.
For the convenience of understanding the technical solution of the present invention, the following detailed description is made on the working principle or the operation mode of the present invention in the practical process.
In practical application, the utility model discloses a two-way operational amplifier and part peripheral circuit realize analog signal conversion PWM signal, power supply V1 is supply voltage, power supply V2 and resistance R13 are external input analog signal, amplifier X1 is as triangle wave generator, way amplifier X2 is as the comparator, compare and pull up resistance R6 output a fixed frequency's PWM signal through triangle wave signal Tri and voltage signal Vi 2:
1. the principle of triangular wave generation: the power supply V1 generates a constant charging current through the resistor R1 and the triode Q1, the diode D2 and the diode D3 to charge the capacitor C1, the voltage of the capacitor C1 rises continuously, when the voltage of the capacitor C1 is higher than that of the resistor R2, the amplifier X1 outputs a low level, the capacitor C1 discharges through the diode D1, a periodic triangular wave signal Tri is generated through continuous charging and discharging of the capacitor C1, and the charging time is determined by the charging current and the capacitance value of the capacitor C1. The simulation waveform is shown in FIG. 3:
2. when there is no externally input dimming signal: the voltage of the voltage signal Vi2 is regulated by a power supply V1 through a voltage regulator tube D6, and then is obtained by voltage division through a resistor R8, a resistor R9, a resistor R12 and an adjustable resistor R14, and then is compared with a triangular wave signal Tri (fig. 4), a PWM signal with a fixed frequency is obtained at an output Vo (fig. 5), the duty ratio of the PWM signal is determined by the amplitude of the voltage signal Vi2, namely, the adjustable resistor R14, and the PWM signal generated by adjusting the adjustable resistor R14 is temporarily represented by a, and the range can be from 0% to 100%.
3. When R14 is a fixed resistance:
1) when the external input signal is the adjustable resistor R13, the power supply V1 generates a constant current source through the diode D2, the diode D3, the triode Q2 and the resistor R10, and a current I is set through adjusting the resistance value of the resistor R101，I1A voltage VR13 is generated through a resistor R13, and after a voltage VR13 clamps a voltage signal Vi through a diode D7, the voltage VR is divided by a resistor R8, a resistor R9, a resistor R12 and a resistor R14 to obtain Vi 2;
2) when the external input signal is a power supply V2, the power supply V2 clamps a voltage signal Vi through a diode D7, and then the voltage signal Vi2 is obtained by voltage division through a resistor R8, a resistor R9, a resistor R12 and a resistor R14;
3) when the external input signal is a PWM signal, the voltage signal Vi becomes a PWM signal with the duty ratio consistent with that of the input PWM signal through clamping of a diode D7, and the voltage signal Vi2 is obtained after filtering by a resistor R8 and a capacitor C2 and voltage division by a resistor R9, a resistor R12 and a resistor R14; the voltage signal Vi2 is compared with the triangular wave Tri, and the voltage signal Vo at the output terminal obtains a PWM waveform with a fixed frequency, and the duty ratio of the PWM signal is determined by the amplitude of the voltage signal Vi2, i.e., by the external input signal. The PWM signal generated by the external input signal, denoted once by B, may range from 0% -100%.
4. Assuming initial output current of power supply ImaxShowing that the adjustable resistance R14 is adjustedAnd different output currents can be adjusted by adjusting input signals (voltage signal amplitude, resistance value and PWM signal duty ratio), and the adjusting mode is as follows:
1) when the dimming signal is not externally connected and the adjustable resistor R14 is adjusted, the output current Io of the power supply1＝ImaxA (A takes a value of 0-100%);
2) the external dimming signal is connected, and when the resistance value of R14 is not changed, the output current Io of the power supply2＝ImaxB (B takes a value of 0-100%);
3) when the external signal and the resistance value of the resistor R14 are changed together, the output current Io of the power supply is ImaxA B (A, B value range 0% -100%).
To sum up, with the help of the above technical scheme of the utility model, the utility model provides a can simply set for initial current and to initial current adjustable dimmer circuit, adopt double-circuit operational amplifier, set for the initial current of power through adjustable resistance, adjust luminance the setting through the current of outside light modulation signal to setting for, can realize that power initial current sets for and to the electric current after setting for adjustable, with low costs, adjust the precision height, adjust portably.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A dimming circuit capable of simply setting and adjusting initial current is characterized by comprising a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, an adjustable resistor R13, an adjustable resistor R14, a capacitor C1, a capacitor C2, a capacitor C3, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, an amplifier X1, an amplifier X2, a triode Q1, a triode Q2, a triode Q3, a power supply V1, a power supply V2, a triangular wave signal Tri, an input signal X1-inn, a voltage signal V1, a voltage signal Vi and a voltage signal Vi;
the voltage signal V0 is sequentially connected to one end of the resistor R6 and the first end of the amplifier X2, the other end of the resistor R6 is sequentially connected to the second end of the amplifier X2, the collector of the transistor Q3, one end of the resistor R5, the anode of the diode D1, one end of the resistor R4, one end of the resistor R3, the anode of the power supply V1, one end of the resistor R2, the second end of the amplifier X1, one end of the resistor R1, the other end of the resistor R3, the cathode of the diode D6, and the cathode of the diode D3, and the cathode of the power supply V1 is grounded;
a third end of the amplifier X2 is sequentially connected to one end of the adjustable resistor R14, one end of the capacitor C2, a negative electrode of the power supply V2, one end of the adjustable resistor R13, one end of the resistor R10, a positive electrode of the diode D6, a third end of the amplifier X1, one end of the capacitor C3, and one end of the resistor R11, and is grounded, and a fourth end of the amplifier X2 is connected to the triangular wave signal Tri;
a fifth end of the amplifier X2 is sequentially connected to the voltage signal Vi2, one end of the resistor R9, and one end of the resistor R12, and the other end of the resistor R12 is connected to the other end of the adjustable resistor R14; the other end of the resistor R9 is sequentially connected with one end of the resistor R8 and the other end of the capacitor C2; the other end of the resistor R8 is sequentially connected with the voltage signal Vi, an emitter of the triode Q3 and the anode of the diode D7; the cathode of the diode D7 is sequentially connected with the anode of the power supply V2, the cathode of the diode D4 and the other end of the adjustable resistor R13; the anode of the diode D4 is sequentially connected with the base of the triode Q3, the collector of the triode Q2 and the anode of the diode D3; an emitter of the triode Q2 is connected with the other end of the resistor R5, and a base of the triode Q2 is sequentially connected with a cathode of the diode D2, a base of the triode Q1 and the other end of the resistor R10; the anode of the diode D2 is connected with the cathode of the diode D1; an emitter of the triode Q1 is connected with the other end of the resistor R4, and a collector of the triode Q1 is sequentially connected with an anode of the diode D5, the other end of the capacitor C3, the triangular wave signal Tri, the input signal X1-inn and a fourth end of the amplifier X1; a cathode of the diode D5 is sequentially connected to a first terminal of the amplifier X1, the other terminal of the resistor R2, one terminal of the capacitor C1, and one terminal of the resistor R7; the other end of the capacitor C1 is sequentially connected to the other end of the resistor R1, the fifth end of the amplifier X1, the other end of the resistor R11 and the other end of the resistor R7.
2. A dimmer circuit capable of setting initial current simply and adjusting initial current according to claim 1, wherein said diode D6 is a zener diode, and said diode D6 is model number BZX 79-10.
3. A dimmer circuit capable of setting and adjusting an initial current according to claim 1, wherein the type of the amplifier X1 and the type of the amplifier X2 are both LM 293.
4. The dimming circuit of claim 1, wherein the transistor Q1 and the transistor Q2 are PNP transistors.
5. A dimmer circuit for setting an initial current and adjusting the initial current according to claim 1, wherein the transistor Q3 is an NPN transistor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921582549.0U CN210579339U (en) | 2019-09-20 | 2019-09-20 | Dimming circuit capable of simply setting initial current and adjusting initial current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921582549.0U CN210579339U (en) | 2019-09-20 | 2019-09-20 | Dimming circuit capable of simply setting initial current and adjusting initial current |
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| CN210579339U true CN210579339U (en) | 2020-05-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110536515A (en) * | 2019-09-20 | 2019-12-03 | 深圳瓦特智汇科技有限公司 | One kind can simply set initial current and to the adjustable light adjusting circuit of initial current |
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2019
- 2019-09-20 CN CN201921582549.0U patent/CN210579339U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110536515A (en) * | 2019-09-20 | 2019-12-03 | 深圳瓦特智汇科技有限公司 | One kind can simply set initial current and to the adjustable light adjusting circuit of initial current |
| CN110536515B (en) * | 2019-09-20 | 2024-05-17 | 深圳瓦特智汇科技有限公司 | Dimming circuit capable of simply setting initial current and adjusting initial current |
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Effective date of registration: 20220418 Address after: 528400 floors 3 and 4, building 2, No. 2, Baocheng Road, Xiaolan Town, Zhongshan City, Guangdong Province Patentee after: Watt Zhihui (Guangdong) Electronics Co.,Ltd. Address before: 518000 208 xihongyuan industrial building, building B1, Buxin Er village, Buxin community 74, Xin'an street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: Shenzhen watt Zhihui Technology Co.,Ltd. |
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