CN216391478U - Linear driving circuit and lighting device - Google Patents
Linear driving circuit and lighting device Download PDFInfo
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- CN216391478U CN216391478U CN202122747125.9U CN202122747125U CN216391478U CN 216391478 U CN216391478 U CN 216391478U CN 202122747125 U CN202122747125 U CN 202122747125U CN 216391478 U CN216391478 U CN 216391478U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The application discloses linear drive circuit and lighting device, this linear drive circuit includes: soft start sets up module and constant current drive module, wherein: the first input end of the soft start setting module is electrically connected with a constant voltage power supply, and the current output by the first output end of the soft start setting module is gradually reduced from a first current value to a second current value within a period of time after power-on; the second input end of the constant current driving module is electrically connected with the first output end, the second output end of the constant current driving module is electrically connected with a light source load to be driven, and the driving current output by the second output end is in negative correlation with the input current of the second input end.
Description
Technical Field
The application relates to the technical field of lighting, in particular to a linear driving circuit and a lighting device.
Background
Since the linear constant current driving has the advantages of simple control, convenient production and the like, the linear constant current driving is widely applied to the field of Light-Emitting Diode (LED) illumination constant current driving.
In the related art, when the linear constant current control circuit obtains a proper working voltage, the current in the power on-off module in the control circuit rises sharply, enters a saturation state and reaches a preset maximum value, and the working current of the LED lamp set is also quickly established to the maximum value, so that the LED lamp set is turned on. In addition, in some two-stage driving circuits, when the linear constant current driving is used as a functional circuit for the subsequent-stage constant current regulation, if the time of the linear constant current driving is earlier than the start of the previous-stage circuit, the phenomenon of LED jitter may occur in the power-on process due to the difference of the start timing. Therefore, the linear constant current driving has the problem that the working current of the LED is established too fast in the power-on process.
SUMMERY OF THE UTILITY MODEL
The application discloses a linear driving circuit and a lighting device, and solves the problem that the LED working current is established too fast in the power-on process in linear constant current driving.
In order to solve the above problems, the following technical solutions are adopted in the present application:
in a first aspect, an embodiment of the present application discloses a linear driving circuit, including: soft start sets up module and constant current drive module, wherein: the first input end of the soft start setting module is electrically connected with a constant voltage power supply, and the current output by the first output end of the soft start setting module is gradually reduced from a first current value to a second current value within a period of time after power-on; the second input end of the constant current driving module is electrically connected with the first output end, the second output end of the constant current driving module is electrically connected with a light source load to be driven, and the driving current output by the second output end is in negative correlation with the input current of the second input end.
In a second aspect, an embodiment of the present application discloses a lighting device, including the linear driving circuit and the light source load described in the first aspect, where a second output terminal of a constant current driving module of the linear driving circuit is electrically connected to the light source load.
The technical scheme adopted by the application can achieve the following beneficial effects:
the embodiment of the application provides a linear driving circuit, including soft start setting module and constant current drive module, through setting up in a period after the power-on, the electric current that the first output of soft start setting module exported diminishes until becoming the second current value by first current value gradually, the second input with the soft start setting module of constant current drive module is connected with the first output electricity of soft start setting module, the second output and the light source load electricity that treats the drive of constant current drive module are connected, the drive current of second output is the negative correlation with the input current of second input, thereby the problem that the operating current of the light source load that treats the drive established the speed excessively has been solved.
Drawings
Fig. 1 is a schematic structural diagram of a linear driving circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another linear driving circuit disclosed in the embodiment of the present application;
fig. 3 is a schematic diagram of output currents of the second output terminal of the constant current driving module at time 0-t of the power-on process disclosed in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present disclosure.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In the specification and claims, "and/or" indicates at least one of electrically connected objects, and a character "/" generally indicates that the preceding and following related objects are in an "or" relationship.
Fig. 1 is a schematic structural diagram of a linear driving circuit disclosed in an embodiment of the present application.
As shown in fig. 1, the linear driving circuit disclosed in the present application includes: soft start setting module 110 and constant current drive module 120, wherein: the first input end of the soft start setting module 110 is electrically connected with the constant voltage power supply, and in a period of time after power-on, the current output by the first output end of the soft start setting module 110 gradually decreases from a first current value to a second current value; the second input end of the constant current driving module 120 is electrically connected to the first output end, the second output end of the constant current driving module 120 is electrically connected to the light source load 130 to be driven, and the driving current output by the second output end is in negative correlation with the input current of the second input end.
Specifically, at the moment of power-on, the current output by the first output terminal of the soft start setting module 110 is quickly established to the maximum value, i.e., the first current value. Since the second input terminal of the constant current driving module 120 is electrically connected to the first output terminal of the soft start setting module 110, and the driving current output by the second output terminal is in negative correlation with the current input by the second input terminal, at the moment of power-on, the driving current output by the second output terminal is the minimum value under the condition that the current output by the first output terminal of the soft start setting module 110 is quickly established to the maximum value. In a period of time after power-on, the current output by the first output terminal of the soft start setting module 110 gradually decreases from the first current value to the second current value, and the driving current output by the second output terminal gradually increases from the minimum value. Since the second output terminal of the constant current driving module 120 is electrically connected to the light source load 130 to be driven, the problem of too fast establishment of the working current of the light source load 130 to be driven does not exist.
The embodiment of the application provides a linear driving circuit, including soft start setting module 110 and constant current drive module 120, through setting up in a period of time after the power-on, the electric current that the first output of soft start setting module 110 exported is reduced gradually until becoming the second current value by first current value, the second input of constant current drive module 120 is connected with the first output electricity of soft start setting module 110, the second output of constant current drive module 120 is connected with the light source load 130 electricity of treating the drive, the drive current of second output is the negative correlation with the input current of second input, thereby the problem that the operating current of light source load 130 of treating the drive has set up the too fast has been solved.
In an alternative, the soft start setting module 110 may include: a first soft start setting submodule and a second soft start setting submodule, wherein: the input end of the first soft start setting submodule is electrically connected with a constant voltage power supply, the output end of the first soft start setting submodule is electrically connected with the second soft start setting submodule, and the voltage output by the output end of the first soft start setting submodule is gradually increased from a first voltage value to a second voltage value within a period of time after the power-on; the input end of the second soft start setting sub-module is electrically connected with the output end of the first soft start setting sub-module, the output end of the second soft start setting sub-module is electrically connected with the second input end, and the current output by the output end of the second soft start setting sub-module is in negative correlation with the voltage input by the input end of the second soft start setting sub-module.
Specifically, the output end of the first soft start sub-module is electrically connected with the input end of the second soft start sub-module, and in a period of time after power-on, the voltage output by the output end of the first soft start sub-module gradually increases from the first voltage value to the second voltage value, that is, in a period of time after power-on, the voltage input by the input end of the second soft start setting sub-module gradually increases from the first voltage value to the second voltage value. Because the output end of the second soft start setting sub-module is electrically connected to the second input end of the constant current driving module 120, and the current output by the output end of the second soft start setting sub-module is negatively correlated to the voltage input by the input end of the second soft start setting sub-module, at the moment of power-on, under the condition that the voltage input by the input end of the second soft start setting sub-module is the first voltage value, the current output by the output end of the second soft start setting sub-module is quickly established to the maximum value (i.e., the first current value mentioned above), and after a period of power-on, under the condition that the voltage input by the input end of the second soft start setting sub-module is increased to the second voltage value, the current output by the output end of the second soft start setting sub-module gradually decreases to the second current value.
In the present application, the first voltage value may be 0, and the second current value may be 0.
In a further technical solution, as shown in fig. 2, the first soft-start setting sub-module may include a first resistor R1, a first capacitor C1, a first on-off module, and a second resistor R2, wherein: one end of a first resistor R1 is electrically connected with a constant voltage power supply, the other end of the first resistor R1 is electrically connected with one end of a first capacitor C1, the other end of the first capacitor C1 is electrically connected with a common reference end, the first end of a first on-off module is electrically connected with the common reference end, the control end of the first on-off module is electrically connected with the first end of the first on-off module, the second end of the first on-off module is electrically connected with one end of a second resistor R2, and the other end of the second resistor R2 is electrically connected with the electrical connection point of a first resistor R1 and a first capacitor C1; under the condition that the input voltage of the control end of the first on-off module is greater than a first threshold value, the first end and the second end of the first on-off module are electrically connected and conducted; the input terminal of the second soft-start setting submodule is electrically connected to the electrical connection point of the first resistor R1 and the first capacitor C1.
In this embodiment, the first switching module may be an N-channel fet, the control terminal of the first switching module is a gate of the fet, the first terminal of the first switching module is a source of the fet, the second terminal of the first switching module is a drain of the fet, that is, the source of the fet M1 is electrically connected to the common reference terminal, the gate of the fet M1 is electrically connected to the source of the fet M1, and the drain of the fet M1 is electrically connected to one end of the second resistor R2.
At the moment of power-on, since the voltage across the first capacitor C1 cannot change abruptly, the voltage across the first capacitor C1 is slowly built up from 0 at this moment.
In an alternative, as shown in fig. 2, the second soft-start setting sub-module may include a third resistor R3, a second switching module, a first operational amplifier INV2, and a current mirror, wherein: one end of a third resistor R3 is electrically connected with the output end of the first soft start setting submodule, and the other end of the third resistor R3 is electrically connected with the first end of the second switching-off module; the control end of the second on-off module is electrically connected with the output end of the first operational amplifier INV2, and the second end of the second on-off module is electrically connected with the current mirror; the positive input end of the first operational amplifier is electrically connected with the first reference voltage end, and the negative input end of the first operational amplifier INV2 is electrically connected with the other end of the third resistor R3; the current mirror is electrically connected between the second on-off module and the constant current driving module 120; and under the condition that the input voltage of the control end of the second on-off module is greater than the first threshold value, the first end and the second end of the second on-off module are electrically connected and conducted.
In this embodiment, the second switching module may be an N-channel fet, the control terminal of the second switching module is a gate of the fet, the first terminal of the second switching module is a source of the fet, the second terminal of the second switching module is a drain of the fet, that is, the gate of the fet M3 is electrically connected to the output terminal of the first operational amplifier INV2, the source of the fet M3 is electrically connected to the other terminal of the third resistor R3, and the drain of the fet M3 is electrically connected to the current mirror.
In the embodiment of the present application, the second voltage value may be equal to a voltage value output by the first reference voltage terminal. I.e. the second voltage value is equal to Vref2。
In particular, it can be based on the formula
The output current of the current mirror (i.e., the first output terminal of the soft-start setting module 110) is determined, wherein IA1 is the output current of the current mirror, Vref2The voltage value output by the first reference voltage terminal, VT, R3, and K1 are the voltage values output by the output terminal of the first soft-start setting submodule, the resistance value of the third resistor, and the current ratio of the current mirror.
Within the time of 0-t in the power-on process, the voltage output by the first soft start setting sub-module is gradually increased from the first voltage value to the front of the second voltage value, namely the voltage output by the first soft start setting sub-module is greater than or equal to 0 and smaller than Vref2When the fet M3 is turned on, the current mirror outputs a current IA 1. When the power-on process reaches t moment, the voltage output by the first soft start setting submodule is equal to Vref2In the case of (1), the fet M3 is turned off, and the current mirror output current IA1 is reduced to 0.
In this embodiment, as shown in fig. 2, the constant current driving module 120 may include a second operational amplifier INV1, a fourth resistor Rext, a fifth resistor R4, and a third switching module, where: a negative input end of the second operational amplifier INV1 is electrically connected to the first output end, a positive input end of the second operational amplifier INV1 is electrically connected to the second reference voltage end, and an output end of the second operational amplifier INV1 is electrically connected to the control end of the third on-off module; a first end of the third on-off module is electrically connected with one end of the fourth resistor Rext, and a second end of the third on-off module is electrically connected with the light source load 130; the other end of the fourth resistor Rext is electrically connected with a common reference end; one end of the fifth resistor R4 is electrically connected with the negative input end of the second operational amplifier INV1, and the other end of the fifth resistor R4 is electrically connected with the first end of the third on-off module and the electrical connection point of the fourth resistor Rext; and under the condition that the input voltage of the control end of the third on-off module is greater than the first threshold value, the first end and the second end of the third on-off module are electrically connected and conducted.
In this embodiment of the application, the third switching module may be a field effect transistor, and specifically may be an N-channel field effect transistor, a first end of the third switching module is a source electrode of the field effect transistor, a second end of the third switching module is a drain electrode of the field effect transistor, and a control end of the third switching module is a gate electrode of the field effect transistor. That is, the gate of the fet M5 is electrically connected to the output terminal of the second operational amplifier INV1, the source of the fet M5 is electrically connected to one end of the fourth resistor Rext, and the drain of the fet M5 is electrically connected to the light source load 130.
In particular, it can be based on the formula
Determining an output current of a second output terminal of the constant current driving module 120, wherein IoutIs the output current, V, of the second output terminal of the constant current driving module 120ref1The reference voltage is the voltage value outputted from the second reference voltage terminal, IA1 is the input current of the second input terminal of the constant current driving module 120, R4 is the resistance value of the fifth resistor, and Rext is the resistance value of the fourth resistor.
In the constant current driving module 120, the second reference voltage V input from the positive input terminal of the second operational amplifier is set during the time from 0 to t of the power-on processref1The input current IA1 at the second input terminal of the constant current driving module 120 has the following relationship: vref1 is not more than IA 1R 4. At the power-on moment, the output end of the second operational amplifier INV1 outputs a low level, the field effect transistor M5 is turned off, and the output current I of the second output end of the constant current driving module 120 is outputout0, at which time the linear drive is in a delayed on state. At time 0-t of the power-on process, the input current IA1 at the second input terminal of the constant current driving module 120 gradually decreases to 0, and the output current I at the second output terminal of the constant current driving module 120 gradually decreases to 0outThe output current of the second output terminal of the constant current driving module 120 is gradually increased from 0 to t in the power-on process, and the magnitude of the output current is as shown in fig. 3.
In addition, can be based on the formula
And determining the power-on starting time of the soft start setting module 110, wherein t is the power-on starting time of the soft start setting module 110, C is the capacitance of the first capacitor, VT is the voltage value output by the output end of the first soft start setting submodule, Vin is the voltage value of the constant voltage power supply, and R1 is the resistance value of the first resistor.
That is, the adjustment of the power-on start time t of the soft-start setting module 110 can be achieved by changing the capacitance C of the first capacitor and/or the resistance value of the first resistor R1. Moreover, the larger the value of the capacitance C of the first capacitor is, the longer the power-on start time of the soft start setting module 110 is, and the softer the visual effect of the light source load 130 in the power-on process is.
In the embodiment of the present application, in order to improve the integration level, the soft-start setting module 110 and the constant current driving module 120 may be provided in an integrated circuit.
The present application discloses a lighting device, which includes the above-mentioned linear driving circuit and a light source load 130, wherein the second output terminal of the constant current driving module 120 of the linear driving circuit is electrically connected with the light source load 130.
Specifically, the Light source load 130 may be a Light-Emitting Diode (LED) lamp set.
In the embodiments of the present application, the difference between the embodiments is described in detail, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in view of brevity of the text.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A linear drive circuit, comprising: soft start sets up module and constant current drive module, wherein:
the first input end of the soft start setting module is electrically connected with a constant voltage power supply, and the current output by the first output end of the soft start setting module is gradually reduced from a first current value to a second current value within a period of time after power-on;
the second input end of the constant current driving module is electrically connected with the first output end, the second output end of the constant current driving module is electrically connected with a light source load to be driven, and the driving current output by the second output end is in negative correlation with the input current of the second input end.
2. The linear drive circuit of claim 1, wherein the soft start setting module comprises: a first soft start setting submodule and a second soft start setting submodule, wherein:
the input end of the first soft start setting submodule is electrically connected with the constant voltage power supply, the output end of the first soft start setting submodule is electrically connected with the second soft start setting submodule, and the voltage output by the output end of the first soft start setting submodule is gradually increased from a first voltage value to a second voltage value within a period of time after the power-on;
the input end of the second soft start setting sub-module is electrically connected with the output end of the first soft start setting sub-module, the output end of the second soft start setting sub-module is electrically connected with the second input end, and the current output by the output end of the second soft start setting sub-module is in negative correlation with the voltage input by the input end of the second soft start setting sub-module.
3. The linear drive circuit of claim 2, wherein the first soft start setting submodule comprises a first resistor, a first capacitor, a first switching module, and a second resistor, wherein:
one end of the first resistor is electrically connected with the constant voltage power supply, the other end of the first resistor is electrically connected with one end of the first capacitor, the other end of the first capacitor is electrically connected with a public reference end, the first end of the first on-off module is electrically connected with the public reference end, the control end of the first on-off module is electrically connected with the first end of the first on-off module, the second end of the first on-off module is electrically connected with one end of the second resistor, and the other end of the second resistor is electrically connected with the electrical connection point of the first resistor and the first capacitor;
under the condition that the input voltage of the control end of the first on-off module is greater than a first threshold value, the first end and the second end of the first on-off module are electrically connected and conducted;
and the input end of the second soft start setting submodule is electrically connected with the electric connection point of the first resistor and the first capacitor.
4. The linear drive circuit of claim 2, wherein the second soft-start setting submodule comprises a third resistor, a second switching module, a first operational amplifier, and a current mirror, wherein:
one end of the third resistor is electrically connected with the output end of the first soft start setting submodule, and the other end of the third resistor is electrically connected with the first end of the second switching-off module;
the control end of the second on-off module is electrically connected with the output end of the first operational amplifier, and the second end of the second on-off module is electrically connected with the current mirror;
the positive input end of the first operational amplifier is electrically connected with a first reference voltage end, and the negative input end of the first operational amplifier is electrically connected with the other end of the third resistor;
the current mirror is electrically connected between the second on-off module and the constant current driving module;
and under the condition that the input voltage of the control end of the second on-off module is greater than a first threshold value, the first end and the second end of the second on-off module are electrically connected and conducted.
5. The linear driving circuit according to claim 4, wherein the second voltage value is equal to a voltage value output from the first reference voltage terminal.
6. The linear driving circuit according to claim 1, wherein the constant current driving module comprises a second operational amplifier, a fourth resistor, a fifth resistor, and a third switching module, wherein:
the negative input end of the second operational amplifier is electrically connected with the first output end, the positive input end of the second operational amplifier is electrically connected with a second reference voltage end, and the output end of the second operational amplifier is electrically connected with the control end of the third on-off module;
a first end of the third on-off module is electrically connected with one end of the fourth resistor, and a second end of the third on-off module is electrically connected with the light source load;
the other end of the fourth resistor is electrically connected with a common reference end;
one end of the fifth resistor is electrically connected with the negative input end of the second operational amplifier, and the other end of the fifth resistor is electrically connected with the first end of the third on-off module and the electric connection point of the fourth resistor;
and under the condition that the input voltage of the control end of the third on-off module is greater than a first threshold value, the first end and the second end of the third on-off module are electrically connected and conducted.
7. The linear driving circuit according to claim 6, wherein the third on-off module is a field effect transistor, a first end of the third on-off module is a source electrode of the field effect transistor, a second end of the third on-off module is a drain electrode of the field effect transistor, and a control end of the third on-off module is a gate electrode of the field effect transistor.
8. The linear driving circuit according to claim 1, wherein the soft start setting module and the constant current driving module are provided in an integrated circuit.
9. A lighting device, comprising the linear driving circuit according to any one of claims 1 to 8 and a light source load, wherein the second output terminal of the constant current driving module of the linear driving circuit is electrically connected to the light source load.
10. A lighting device as recited in claim 9, wherein said light source load is a group of light emitting diode lights.
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| CN202122747125.9U CN216391478U (en) | 2021-11-10 | 2021-11-10 | Linear driving circuit and lighting device |
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| CN202122747125.9U CN216391478U (en) | 2021-11-10 | 2021-11-10 | Linear driving circuit and lighting device |
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