CN217428401U - Adjustable light linear circuit capable of adjusting constant output current - Google Patents
Adjustable light linear circuit capable of adjusting constant output current Download PDFInfo
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- CN217428401U CN217428401U CN202220663179.9U CN202220663179U CN217428401U CN 217428401 U CN217428401 U CN 217428401U CN 202220663179 U CN202220663179 U CN 202220663179U CN 217428401 U CN217428401 U CN 217428401U
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Abstract
The utility model discloses a light-adjustable linear circuit capable of adjusting the constant output current, which is provided with an output end, a negative electrode and a control end, when the control end of the light-adjustable linear circuit is connected with different electric signals, the output end of the adjustable light linear circuit outputs constant current with corresponding magnitude, the adjustable light linear circuit comprises a linear constant current unit and n current expansion units, n is an integer larger than or equal to 1, an adjusting resistor is arranged between the adjusting end of the linear constant current unit and the negative electrode of the linear constant current unit, the control end of the linear constant current unit is the control end of the adjustable light linear circuit, the output ends of the n current expansion units are connected with the output end of the linear constant current unit, the connecting end of the n current expansion units is the output end of the adjustable light linear circuit, the negative electrodes of the n current expansion units are connected with the negative electrode of the linear constant current unit, the connecting end of the n current expansion units is the negative electrode of the adjustable light linear circuit, and the control ends of the n current expansion units are connected with the adjusting end of the linear constant current unit; the method has the advantages of large maximum output current, low cost and high market competitiveness.
Description
Technical Field
The utility model relates to a linear circuit can adjust luminance especially relates to a linear circuit can adjust luminance of adjustable invariable output current size.
Background
As shown in fig. 1, a conventional linear constant current LED lamp circuit generally includes a full bridge rectifier circuit having a first voltage input terminal, a second voltage input terminal, a positive output terminal and a negative output terminal, an LED light emitting circuit having a positive electrode and a negative electrode, the adjustable light linear circuit is a linear constant current circuit which adopts a PWM signal or an analog voltage signal to adjust the output current, the adjustable light linear circuit is provided with an output end, a cathode and a control end, when the control end of the adjustable light linear circuit is connected with different electric signals, the output end of the LED light-emitting circuit outputs constant current with corresponding magnitude, the anode of the LED light-emitting circuit is connected with the positive output end of the full-bridge rectification circuit, the anode of the LED light-emitting circuit is connected with the output end of the dimmable linear circuit, and the cathode of the dimmable linear circuit is connected with the negative output end of the full-bridge rectification circuit.
When the first voltage input end and the second voltage input end of the full-bridge rectification circuit are connected with commercial power alternating-current voltage, direct-current voltage is output between the positive output end and the negative output end of the full-bridge rectification circuit, the control end of the dimmable linear circuit is connected with different electric signals, the output end of the dimmable linear circuit outputs constant current with corresponding size, the LED light-emitting circuit is driven to emit light, the larger the current output by the output end of the dimmable linear circuit is, the larger the light-emitting intensity of the LED light-emitting circuit is, the smaller the current output by the output end of the dimmable linear circuit is, and the smaller the light-emitting intensity of the LED light-emitting circuit is.
The adjustable light linear circuit comprises at least one linear constant current circuit unit (linear constant current unit for short) capable of adjusting the output current and a corresponding number of adjusting resistors, as shown in fig. 2, each linear constant current unit is provided with an output end, an adjusting end, a control end and a negative electrode, an adjusting resistor is arranged between the adjusting end and the negative electrode, and the maximum output current of the output end of the linear constant current unit can be set by changing the resistance value of the adjusting resistor. When the control end of the linear constant current unit is connected with different electric signals, the control end outputs and outputs currents with corresponding sizes, and meanwhile, direct-current voltages with corresponding sizes are arranged between the adjusting end and the negative electrode of the linear constant current unit. The larger the current output by the output end of the linear constant current unit is, the larger the direct current voltage between the regulating end and the negative electrode is, and the smaller the current output by the output end of the linear constant current unit is, the smaller the direct current voltage between the regulating end and the negative electrode is.
When one linear constant current unit can meet the output current requirement of the dimmable linear circuit, the dimmable linear circuit comprises a linear constant current unit and a regulating resistor, the output end of the linear constant current unit is the output end of the dimmable linear circuit, the control end of the linear constant current unit is the control end of the dimmable linear circuit, and the cathode of the linear constant current unit is the cathode of the dimmable linear circuit. The maximum output current of the adjustable light linear circuit is the maximum current which can be output by one linear constant current unit. In this case, the linear constant current unit has a low cost, and the dimmable linear circuit has a low cost, but the maximum output current is also low.
When one linear constant current unit cannot meet the output current requirement of the dimmable linear circuit, the dimmable linear circuit comprises k linear constant current units and k adjusting resistors, wherein k is an integer greater than or equal to 2, the output ends of the k linear constant current units are connected together, the connecting end of the k linear constant current units is the output end of the dimmable linear circuit, the k adjustable resistors and the k linear constant current units are connected according to the method that one adjustable resistor is connected between the control end and the negative electrode of one linear constant current unit, the negative electrodes of the k linear constant current units are connected together, and the connecting end of the k linear constant current units is the negative electrode of the dimmable linear circuit. The maximum output current of the adjustable light linear circuit is the sum of the maximum currents output by the k linear constant current units. In this case, since the linear constant current unit has a high cost, the maximum output current of the dimming linear circuit can be increased, but the cost is high, and the market competitiveness is reduced.
Disclosure of Invention
The utility model aims to solve the technical problem that a maximum output current is great is provided, and the cost is also lower, has the adjustable light linear circuit of the adjustable invariable output current size of higher market competition.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: a kind of adjustable light linear circuit which can adjust the constant output current, it has output end, negative pole and control end, when the control end of the adjustable light linear circuit is connected with different electric signals, the output end outputs the corresponding constant current, the adjustable light linear circuit includes a linear constant current unit and an adjusting resistor, the linear constant current unit has output end, control end, adjusting end and negative pole, one end of the adjusting resistor is connected with the adjusting end of the linear constant current unit, the other end of the adjusting resistor is connected with the negative pole of the linear constant current unit, the maximum output current of the output end of the linear constant current unit can be set by changing the resistance of the adjusting resistor, when the control end of the linear constant current unit is connected with different electric signals, the output end outputs the corresponding current, meanwhile, a direct current voltage with a corresponding magnitude is arranged between the adjusting end and the negative electrode, the larger the current output by the output end of the linear constant current unit is, the larger the direct current voltage between the adjusting end and the negative electrode is, the smaller the current output by the output end of the linear constant current unit is, the smaller the direct current voltage between the adjusting end and the negative electrode is, the dimmable linear circuit further comprises n current expansion units, n is an integer greater than or equal to 1, each current expansion unit is respectively provided with a control end, a negative electrode and an output end, the magnitude of the current output by the output end of the current expansion unit corresponds to the magnitude of the direct current voltage connected to the control end of the current expansion unit, the control end of the linear constant current unit is the control end of the dimmable linear circuit, the output ends of the n current expansion units are connected with the output end of the linear constant current unit, and the connecting end of the current expansion units is the output end of the dimmable linear circuit, the negative electrodes of the n current expansion units are connected with the negative electrode of the linear constant current unit, the connecting end of the n current expansion units is the negative electrode of the adjustable light linear circuit, and the control ends of the n current expansion units are connected with the adjusting end of the linear constant current unit.
Each of the current spreading units comprises a first integrated circuit, a first resistor and a first diode, the first integrated circuit is a general linear constant current integrated circuit, the first integrated circuit is provided with a REXT pin, an OUT pin and a GND pin, the first diode is a rectifier diode, the OUT pin of the first integrated circuit is the output end of the current expansion unit, the GND pin of the first integrated circuit is the control end of the current expansion unit, the REXT pin of the first integrated circuit is connected with the anode of the first diode, the cathode of the first diode is connected with one end of the first resistor, the other end of the first resistor is the cathode of the current expansion unit, the internal reference voltage of the REXT pin of the first integrated circuit is less than the turn-on voltage of the first diode. The current expansion unit is designed by adopting a conventional device, and has a simple structure and lower cost.
The linear constant current unit is also provided with a positive electrode, the linear constant current unit is connected with the required working voltage through the positive electrode, the dimmable linear circuit correspondingly has a positive electrode, the positive electrode of the linear constant current unit is the positive electrode of the dimmable linear circuit, the positive electrode of the dimmable linear circuit is connected with the positive output end of the full-bridge rectification circuit in actual use, the linear constant current unit comprises a second integrated circuit and a second resistor, the second integrated circuit is provided with a VIN pin, a DIM pin, an OUT pin, a GND pin and a REXT pin, when the VIN pin of the second integrated circuit is connected with the PWM signal, the OUT pin outputs constant current with corresponding magnitude, the DIM pin of the second integrated circuit is the control end of the linear constant current unit, and the OUT pin of the second integrated circuit is the output end of the linear constant current unit, the REXT pin of the second integrated circuit is a regulating end of the linear constant current unit, the GND pin of the second integrated circuit is a cathode of the linear constant current unit, the REXT pin of the second integrated circuit is connected with one end of the regulating resistor, the other end of the regulating resistor is connected with the cathode of the linear constant current unit, the Vin pin of the second integrated circuit is connected with one end of the second resistor, and the other end of the second resistor is an anode of the linear constant current unit. The linear constant current unit is simple in structure, low in cost and easy to expand.
Compared with the prior art, the utility model has the advantages that by arranging n current expansion units, wherein n is an integer more than or equal to 1, each current expansion unit is respectively provided with a control end, a negative electrode and an output end, the current output by the output end corresponds to the direct current voltage connected to the control end, the control end of the linear constant current unit is the control end of the adjustable light linear circuit, the output ends of the n current expansion units are connected with the output end of the linear constant current unit, the connecting end of the n current expansion units is the output end of the adjustable light linear circuit, the negative electrodes of the n current expansion units are connected with the negative electrode of the linear constant current unit, the connecting end of the n current expansion units is the negative electrode of the adjustable light linear circuit, the control ends of the n current expansion units are connected with the adjusting end of the linear constant current unit, when the control end of the adjustable light linear circuit is connected with an electric signal, the output of linear constant current unit corresponds the electric current of size, the production corresponds the direct current voltage of size between the regulation end of linear constant current unit and the negative pole simultaneously, n individual current extension unit is under this direct current voltage control, at the electric current of respective output correspondence size, the total current size of the output of the linear circuit of can adjusting luminance is the sum of the electric current of the output of linear constant current unit and the electric current of the output of n individual current extension unit, the maximum output current of the linear circuit of can adjusting luminance is greater than the electric current of linear constant current unit output, therefore the utility model discloses a linear circuit of can adjusting luminance need not increase the quantity of linear constant current unit, can have great maximum output current, and the cost is also lower, has higher market competition.
Drawings
Fig. 1 is a schematic structural diagram of a conventional linear constant current LED lamp circuit;
fig. 2 is a diagram of a connection structure of a linear constant current unit and a regulating resistor of a conventional dimmable linear circuit;
fig. 3 is a schematic structural diagram of the adjustable light linear circuit of the present invention capable of adjusting the magnitude of the constant output current;
fig. 4 is a circuit diagram of the adjustable light linear circuit with a current expanding unit according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Example (b): as shown in FIG. 3, a dimmable linear circuit capable of adjusting the magnitude of a constant output current, which has an output terminal, a negative terminal and a control terminal, wherein when the control terminal of the dimmable linear circuit is connected to different electrical signals, the output terminal outputs a constant current of a corresponding magnitude, the dimmable linear circuit includes a linear constant current unit and an adjusting resistor RJ, the linear constant current unit has an output terminal, a control terminal, an adjusting terminal and a negative terminal, one terminal of the adjusting resistor RJ is connected to the adjusting terminal of the linear constant current unit, the other terminal of the adjusting resistor RJ is connected to the negative terminal of the linear constant current unit, the maximum output current of the output terminal of the linear constant current unit can be set by changing the magnitude of the resistance of the adjusting resistor RJ, when the control terminal of the linear constant current unit is connected to different electrical signals, the output terminal outputs a current of a corresponding magnitude, and a DC voltage of a corresponding magnitude is provided between the adjusting terminal and the negative terminal, the larger the current output by the output end of the linear constant current unit is, the larger the direct current voltage between the regulating end and the negative electrode is, the smaller the current output by the output end of the linear constant current unit is, and the smaller the direct current voltage between the regulating end and the negative electrode is, the adjustable light linear circuit further comprises n current expansion units M1-Mn, wherein n is an integer greater than or equal to 1, each current expansion unit is respectively provided with a control end, a negative electrode and an output end, the magnitude of the current output by the output end of the current expansion unit corresponds to the magnitude of the direct current voltage connected to the control end of the current expansion unit, the control end of the linear constant current unit is the control end of the adjustable light linear circuit, the output ends of the n current expansion units M1-Mn are connected with the output end of the linear constant current unit, the connecting ends of the n current expansion units M1-Mn are connected with the negative electrode of the linear constant current unit, and the connecting ends of the adjustable light linear circuit are the negative electrodes of the adjustable light linear circuit, the control ends of the n current expansion units M1-Mn are connected with the regulating end of the linear constant current unit.
As shown in fig. 4, each current spreading unit includes a first integrated circuit U1, a first resistor R1, and a first diode D1, the first integrated circuit U1 is a general-purpose linear constant current integrated circuit, and has a reference model SM2082K, the first integrated circuit U1 has a REXT pin, an OUT pin, and a GND pin, the first diode D1 is a rectifier diode, the OUT pin of the first integrated circuit U1 is an output terminal of the current spreading unit, the GND pin of the first integrated circuit U1 is a control terminal of the current spreading unit, the REXT pin of the first integrated circuit U1 is connected to an anode of the first diode D1, a cathode of the first diode D1 is connected to one end of the first resistor R1, another end of the first resistor R1 is a cathode of the current spreading unit, and an internal reference voltage of the REXT pin of the first integrated circuit U1 is smaller than an on voltage of the first diode D1. As shown in fig. 4, the linear constant current unit further has an anode, the linear constant current unit is connected to the required operating voltage through the anode, so the dimmable linear circuit correspondingly has an anode, the anode of the linear constant current unit is the anode of the dimmable linear circuit, the anode of the dimmable linear circuit is connected to the positive output terminal of the full-bridge rectifier circuit in actual use, the linear constant current unit includes a second integrated circuit U2 and a second resistor R2, the reference model of the second integrated circuit U2 is SM2611, the second integrated circuit U2 has a VIN pin, a DIM pin, an OUT pin, a GND pin and a REXT pin, when the VIN pin of the second integrated circuit U2 is connected to the PWM signal, the OUT pin outputs a constant current of a corresponding magnitude, the DIM pin of the second integrated circuit U2 is the control terminal of the linear constant current unit, the OUT pin of the second integrated circuit U2 is the output terminal of the linear constant current unit, the REXT pin of the second integrated circuit is the regulation terminal of the constant current unit, the GND pin of the second integrated circuit U2 is the cathode of the linear constant current unit, the REXT pin of the second integrated circuit U2 is connected with one end of the adjusting resistor RJ, the other end of the adjusting resistor RJ is connected with the cathode of the linear constant current unit, the Vin pin of the second integrated circuit U2 is connected with one end of the second resistor R2, and the other end of the second resistor R2 is the anode of the linear constant current unit.
Claims (3)
1. A linear circuit of adjustable light of the magnitude of the constant output current, have output terminal, negative pole and control end, when the control end of the linear circuit of adjustable light inserts different electric signals, its output terminal outputs the constant current of the corresponding magnitude, the linear circuit of adjustable light includes a linear constant current unit and a regulating resistor, the said linear constant current unit has output terminal, control end, regulating end and negative pole, one end of the said regulating resistor connects with regulating end of the said linear constant current unit, another end of the said regulating resistor connects with negative pole of the said linear constant current unit, can set up the maximum output current of the output terminal of the said linear constant current unit through changing the magnitude of resistance of the said regulating resistor, when the control end of the said linear constant current unit inserts different electric signals, its output terminal outputs the current of the corresponding magnitude, the linear constant current unit is characterized by also comprising n current expansion units, wherein n is an integer greater than or equal to 1, each current expansion unit is respectively provided with a control end, a negative electrode and an output end, the magnitude of the current output by the output end of the current expansion unit corresponds to the magnitude of the direct current voltage connected to the control end of the current expansion unit, the control end of the linear constant current unit is the control end of the dimmable linear circuit, the output ends of the n current expansion units are connected with the output ends of the linear constant current unit, and the connecting end of the n current expansion units is the output end of the dimmable linear circuit, the negative electrodes of the n current expansion units are connected with the negative electrode of the linear constant current unit, the connecting end of the n current expansion units is the negative electrode of the adjustable light linear circuit, and the control ends of the n current expansion units are connected with the adjusting end of the linear constant current unit.
2. The adjustable optical linear circuit of claim 1, wherein each of the current spreading units comprises a first integrated circuit, a first resistor and a first diode, the first integrated circuit is a general linear constant current integrated circuit, the first integrated circuit has a REXT pin, an OUT pin and a GND pin, the first diode is a rectifier diode, the OUT pin of the first integrated circuit is an output terminal of the current spreading unit, the GND pin of the first integrated circuit is a control terminal of the current spreading unit, the REXT pin of the first integrated circuit is connected to a positive electrode of the first diode, a negative electrode of the first diode is connected to one end of the first resistor, and the other end of the first resistor is a negative electrode of the current spreading unit, the internal reference voltage of the REXT pin of the first integrated circuit is less than the turn-on voltage of the first diode.
3. The adjustable light linear circuit of claim 1 or 2, wherein the linear constant current unit further has a positive electrode, the linear constant current unit is connected to a required working voltage through the positive electrode, correspondingly, the adjustable light linear circuit further has a positive electrode, the positive electrode of the linear constant current unit is the positive electrode of the adjustable light linear circuit, the positive electrode of the adjustable light linear circuit is connected to a positive output terminal of a full bridge rectification circuit in actual use, the linear constant current unit includes a second integrated circuit and a second resistor, the second integrated circuit has a VIN pin, a DIM pin, an OUT pin, a GND pin and a REXT pin, when the VIN pin of the second integrated circuit is connected to a PWM signal, the OUT pin outputs a constant current with a corresponding magnitude, the DIM pin of the second integrated circuit is a control terminal of the linear constant current unit, the OUT pin of the second integrated circuit is the output end of the linear constant current unit, the REXT pin of the second integrated circuit is the regulating end of the linear constant current unit, the GND pin of the second integrated circuit is the cathode of the linear constant current unit, the REXT pin of the second integrated circuit is connected with one end of the regulating resistor, the other end of the regulating resistor is connected with the cathode of the linear constant current unit, the Vin pin of the second integrated circuit is connected with one end of the second resistor, and the other end of the second resistor is the anode of the linear constant current unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220663179.9U CN217428401U (en) | 2022-03-24 | 2022-03-24 | Adjustable light linear circuit capable of adjusting constant output current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220663179.9U CN217428401U (en) | 2022-03-24 | 2022-03-24 | Adjustable light linear circuit capable of adjusting constant output current |
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|---|---|
| CN217428401U true CN217428401U (en) | 2022-09-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220663179.9U Active CN217428401U (en) | 2022-03-24 | 2022-03-24 | Adjustable light linear circuit capable of adjusting constant output current |
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| CN (1) | CN217428401U (en) |
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- 2022-03-24 CN CN202220663179.9U patent/CN217428401U/en active Active
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