CN215734930U - Switching dimming LED drive circuit and LED lamp - Google Patents
Switching dimming LED drive circuit and LED lamp Download PDFInfo
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- CN215734930U CN215734930U CN202121215513.6U CN202121215513U CN215734930U CN 215734930 U CN215734930 U CN 215734930U CN 202121215513 U CN202121215513 U CN 202121215513U CN 215734930 U CN215734930 U CN 215734930U
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Abstract
The utility model relates to the technical field of data processing, in particular to a switching dimming LED driving circuit and an LED lamp. The switching dimming LED driving circuit comprises at least one group of first lamp strings, at least one group of second lamp strings, a first switch, a second switch, a driving module and a switch switching module; and powering on the switch switching module to keep the first switch and/or the second switch on, so that the conducting state of the first load circuit and the conducting state of the second load circuit are cyclically changed according to the power-on times of the switch switching module. This switch LED drive circuit of adjusting luminance can realize adjusting the luminous position of LED lamps and lanterns through the mode that the switch was gone up the electricity, when setting up different colour temperatures or colour lamp cluster, can adjust colour temperature or colour, and circuit structure and operation process are simple, and the practicality is strong to adopt high integration driver chip, save power frequency transformer, further simplify circuit structure, it is with low costs.
Description
Technical Field
The utility model relates to the technical field of illumination, in particular to a switching dimming LED driving circuit and an LED lamp.
Background
In the field of LED lighting, dimming and color temperature adjustment have been the focus of attention. So-called dimming, i.e. adjusting the brightness of a light source; the term "color temperature" is generally used to refer to the adjustment of the color of a light source, and refers to the temperature of a black body at which the color of light emitted from the light source coincides with the hue of light emitted from the black body at a certain temperature. The difference between the color temperature and the brightness is often different, for example, under the irradiation of a high color temperature light source, the brightness is not high, so that people have a cool and shady atmosphere; under the irradiation of a low color temperature light source, the brightness is too high, and a stuffy feeling is brought to people. Therefore, the brightness and the color temperature of the light source are accurately adjusted, and the market competitiveness of the LED illumination product is favorably improved.
The prior art is to the solution in LED lamps and lanterns accent light mixing colour temperature field: two paths of independent PWM signals are generated, wherein one path of PWM signal controls one path of LED lamp string, the other path of PWM signal controls one path of LED lamp string, an embedded intelligent module is arranged in a driving circuit, and the control is carried out through intelligent software. The scheme can realize the function of color temperature adjustment, but an embedded intelligent module is required to be arranged, so that the structure of a driving circuit and the adjustment logic are complex, and the production cost is high.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a switching dimming LED driving circuit and an LED lamp, so as to solve one or more technical problems in the prior art, and to provide at least one of the advantages of the switching dimming LED driving circuit and the LED lamp.
In order to achieve the above object, the present invention provides the following technical solutions.
In a first aspect, a switching dimming LED driving circuit is provided, which includes at least one group of first light strings, at least one group of second light strings, a first switch, a second switch, a driving module, and a switch switching module;
the driving module is provided with a first driving end and a second driving end, and the switch switching module is provided with a first adjusting end and a second adjusting end;
the first driving end, the first lamp string, the first switch and the second driving end are connected in series to form a first load circuit, and the trigger end of the first switch is connected with the first adjusting end;
the first driving end, the second light string, the second switch and the second driving end are connected in series to form a second load circuit, and the trigger end of the second switch is connected with the second adjusting end;
and powering on the switch switching module to keep the first switch and/or the second switch on, so that the conducting state of the first load circuit and the conducting state of the second load circuit are cyclically changed according to the power-on times of the switch switching module.
Further, the driving module comprises a driving chip, and the driving chip is a JWB1992M constant current type chip.
Furthermore, the driving module further comprises an input filtering unit, an output filtering unit and an energy storage unit, the input filtering unit is connected with the power taking end of the driving chip, the output filtering unit is respectively connected with the first driving end and the second driving end, and the energy storage unit is arranged in the first load circuit and the second load circuit.
Further, the driving module further comprises a current detection unit;
one end of the current detection unit is connected with the first load circuit and the second load circuit respectively, and one end of the current detection unit is connected with the current detection end of the driving chip.
Further, the switch switching module comprises a switch switching chip, an input rectifying unit, a pull-up resistor, a pull-down resistor and a coupling capacitor;
the input end of the input rectifying unit is connected with the voltage input end of the driving module, the output end of the input rectifying unit is connected with one end of the pull-up resistor, the other end of the pull-up resistor is connected with the power supply voltage end of the switch switching chip, one end of the pull-down resistor is connected with the power supply voltage end of the switch switching chip, the other end of the pull-down resistor is grounded, one end of the coupling capacitor is connected with the working voltage end of the switch switching chip, and the other end of the coupling capacitor is grounded.
Further, the switch switching module further comprises a first bias current unit;
one end of the first bias current unit is connected with the trigger end of the first switch and the trigger end of the second switch respectively, the other end of the first bias current unit is connected with the first driving end, and bias current is provided for the trigger end of the first switch and the trigger end of the second switch through the first driving end.
Further, the switching dimming LED driving circuit further comprises a third switch and a fourth switch, and the switch switching module further comprises a second bias current unit;
one end of the third switch is connected with the trigger end of the first switch, the other end of the third switch is grounded, and the trigger end of the third switch is connected with the first adjusting end;
one end of the fourth switch is connected with the trigger end of the second switch, the other end of the fourth switch is grounded, and the trigger end of the fourth switch is connected with the second adjusting end;
one end of the second bias current unit is respectively connected with the trigger end of the third switch and the trigger end of the fourth switch, the other end of the second bias current unit is connected with the first driving end, and bias current is provided for the trigger end of the third switch and the trigger end of the fourth switch through the first driving end.
Further, the first switch and the second switch are transistor transistors;
the emitter of the first switch is connected with the first lamp string, the collector of the first switch is connected with the second driving end, and the base of the first switch is connected with the first adjusting end;
the emitting electrode of the second switch is connected with the second lamp string, the collector electrode of the second switch is connected with the second driving end, and the base electrode of the second switch is connected with the second adjusting end.
Further, the first switch and the second switch are field effect transistors;
the drain electrode of the first switch is connected with the first lamp string, the source electrode of the first switch is connected with the second driving end, and the grid electrode of the first switch is connected with the first adjusting end;
the drain electrode of the second switch is connected with the second lamp string, the source electrode of the second switch is connected with the second driving end, and the grid electrode of the second switch is connected with the second adjusting end.
In a second aspect, an LED lamp is provided, which includes the switching dimming LED driving circuit of the first aspect.
The utility model has the beneficial effects that: the LED lamp has the advantages that the switch switching module is arranged, the light emitting position of the LED lamp can be adjusted through the power-on mode of the switch, the color temperature or the color can be adjusted when different color temperatures or color lamp strings are arranged, the circuit structure and the operation process are simple, the practicability is high, the power frequency transformer is omitted by adopting the high-integration driving chip, the circuit structure is further simplified, and the cost is low.
Drawings
Fig. 1 is a circuit schematic diagram of a switching dimming LED driving circuit according to a first embodiment.
Fig. 2 is a circuit schematic of a switching dimming LED driving circuit according to a second embodiment.
Fig. 3 is a circuit schematic diagram of a switching dimming LED driving circuit according to a third embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the present invention will be further described with reference to the embodiments and the accompanying drawings.
According to a first aspect of the present invention, a switching dimming LED driving circuit is provided. Fig. 1 is a circuit schematic diagram of a switching dimming LED driving circuit according to a first embodiment.
Referring to fig. 1, the switching dimming LED driving circuit includes a first light string 100, a second light string 200, a first switch Q1, a second switch Q2, a driving module 300, and a switch switching module 400.
It should be noted that the number of the first light strings 100 and the number of the second light strings 200 may be one or more groups, and when the number is multiple groups, the first light strings 100 are connected in parallel with each other, and the second light strings 200 are connected in parallel with each other, in this embodiment, the number of the first light strings 100 and the number of the second light strings 200 are both one group.
The connection relation of each component of the switching dimming LED driving circuit is as follows:
the driving module 300 has a first driving end T1 and a second driving end T2, and the switch switching module 400 has a first adjusting end P1 and a second adjusting end P2;
the first driving end T1, the first lamp string 100, the first switch Q1 and the second driving end T1 are connected in series to form a first load circuit, and the trigger end of the first switch Q1 is connected with the first adjusting end P1;
the first driving terminal T1, the second string light 200, the second switch Q2 and the second driving terminal T2 are connected in series to form a second load circuit, and the trigger terminal of the second switch Q2 is connected to the second regulation terminal P2.
The switching principle of the switching dimming LED driving circuit provided by the utility model is as follows: the switch switching module 400 is powered on to keep the first switch Q1 and/or the second switch Q2 conductive, such that the conductive state of the first load circuit and the conductive state of the second load circuit are cyclically changed according to the number of times the switch switching module 400 is powered on.
Illustratively, the switch switching module 400 may be a three-stage switching regulation, and the switch switching sequence may be the following process during a cyclic switching cycle:
the switch switching module 400 is powered on for the first time, and outputs a regulation signal through the first regulation terminal P1, wherein the regulation signal acts on the trigger terminal of the first switch Q1 and keeps the first switch Q1 conductive. At this time, the first string of lights 100 is turned on to emit light due to the on state of the first switch Q1, and the second string of lights 200 is turned off due to the off state of the second switch Q2.
The switch switching module 400 is powered up for the second time, and outputs the regulation signal through the second regulation terminal P2, and the regulation signal acts on the trigger terminal of the second switch Q2 and keeps the second switch Q2 turned on. At this time, the second string of lights 200 is turned on to emit light due to the on state of the second switch Q2, and the first switch Q1 is in the off state, so that the first string of lights 100 does not emit light.
The switch switching module 400 is powered up for the third time, and outputs the adjusting signal through the first adjusting terminal P1 and the second adjusting terminal P2, which respectively act on the trigger terminal of the first switch Q1 and the trigger terminal of the second switch Q2, so that the first switch Q1 and the second switch Q2 are kept on. At this time, since the first switch Q1 and the second switch Q2 are both turned on, the first string of lights 100 and the first string of lights 100 are both turned on to emit light.
Similarly, the switch switching module 400 may also be a two-stage switching regulator, and in the cyclic switching period, the switching sequence may be as follows:
the switch switching module 400 is powered on for the first time, and outputs a regulation signal through the first regulation terminal P1, wherein the regulation signal acts on the trigger terminal of the first switch Q1 and keeps the first switch Q1 conductive. At this time, the first string of lights 100 is turned on to emit light due to the on state of the first switch Q1, and the second string of lights 200 is turned off due to the off state of the second switch Q2.
The switch switching module 400 is powered up for the second time, and outputs the regulation signal through the second regulation terminal P2, and the regulation signal acts on the trigger terminal of the second switch Q2 and keeps the second switch Q2 turned on. At this time, the second string of lights 200 is turned on to emit light due to the on state of the second switch Q2, and the first switch Q1 is in the off state, so that the first string of lights 100 does not emit light.
The difference between the first light string 100 and the second light string 200 may be color temperature, color, brightness, or installation position, and the switching process may be used to switch color temperature, color, brightness, or light-emitting position, and the operation is simple and flexible.
The driving module 300 of this embodiment includes a driving chip U1, an input filtering unit 301, an output filtering unit 302, and an energy storage unit 303; the driving chip U1 is a JWB1992M constant current chip, the input filter unit 301 is connected to the power-taking end of the driving chip U1, the output filter unit 302 is connected to the first driving end T1 and the second driving end T2, and the energy storage unit 303 is disposed in the first load circuit and the second load circuit.
In this embodiment, the input filter unit 301 is composed of a first capacitor C1, a first resistor R1, and a first inductor L1, and the input end of the input filter unit 301 is further provided with a first input node L, a second input node N, a power-on switch SW1, and a fuse FR 1.
Specifically, one end of the power-on switch SW1 is connected to the first input node L, the other end of the power-on switch SW1 is connected to one power-taking end ACIN1 of the driving chip U1 through the fuse FR1, one end of the first inductor L1 is connected to the second input node N, the other end of the first inductor L1 is connected to the other power-taking end ACIN2 of the driving chip U1, the first capacitor C1 is connected in parallel between the first input node L and the second input node N, and the first resistor R1 is connected in parallel between two ends of the first inductor L1. The first input node L is connected with a live wire, the second input node N is connected with a zero wire, the first capacitor C1 is used for inhibiting differential mode interference on the first input node L and the second input node N, and the first inductor L1 is used for inhibiting differential mode interference on the second input node N.
In the present embodiment, the output filter unit 302 includes a first electrolytic capacitor CE1, a second electrolytic capacitor CE2, and a fourth resistor R4.
Specifically, the anode of the first electrolytic capacitor CE1 is connected to the first driving terminal T1, the cathode of the first electrolytic capacitor CE1 is grounded, the anode of the second electrolytic capacitor CE2 is connected to the first driving terminal T1, the cathode of the second electrolytic capacitor CE2 is connected to the second driving terminal T2 through the second inductor L2, and the fourth resistor R4 is connected in parallel to the second electrolytic capacitor CE 2. The first electrolytic capacitor CE1, the second electrolytic capacitor CE2 and the second inductor L2 are respectively used for filtering out interference signals on the driving end, and the fourth resistor R4 is used for releasing the electric quantity of the second electrolytic capacitor CE 2.
In the present embodiment, the energy storage unit 303 includes a second inductor L2.
Specifically, the first switch Q1 is connected to the cathode of the first string of lights 100, the second switch Q2 is connected to the cathode of the second string of lights 200, one end of the second inductor L2 is connected to the first switch Q1 and the second switch Q2, and the other end of the second inductor L2 is connected to the second driving terminal T2.
The driving module 300 of this embodiment further includes a current detecting unit 304, configured to collect currents of the first load circuit and the second load circuit; one end of the current detection unit 304 is connected to the first load circuit and the second load circuit, respectively, and one end of the detection unit is connected to the current detection end of the driving chip.
In the present embodiment, the current detection unit 304 includes a third capacitor C3 and a detection resistor RS 1.
Specifically, one end of the third capacitor C3 is connected to the first load circuit and the second load circuit, respectively, and the other end of the third capacitor C3 is connected to the current detection end of the driver chip U1 through the detection resistor RS 1.
The switch switching module 400 of this embodiment includes a switch switching chip U2, an input rectifying unit 401, a pull-up resistor R2, a pull-down resistor R3, and a coupling capacitor C2; the switching chip U2 is a core flying ice S4223 switching chip, the input end of the input rectifying unit 401 is connected with the voltage input end of the driving module, the output end of the input rectifying unit 401 is connected with one end of a pull-up resistor R2, the other end of the pull-up resistor R2 is connected with the power supply voltage end of the switching chip U2, one end of a pull-down resistor R3 is connected with the power supply voltage end of the switching chip U2, the other end of the pull-down resistor R3 is grounded, one end of a coupling capacitor C2 is connected with the working voltage end of the switching chip U2, and the other end of the coupling capacitor C2 is grounded.
In the present embodiment, the input rectification unit 401 includes a first diode D1 and a second diode D2.
Specifically, an anode of the first diode D1 and an anode of the second diode D2 are connected to the voltage input terminal of the driving module 300, respectively, and a cathode of the first diode D1 and a cathode of the second diode D2 are connected to the pull-up resistor R2, respectively.
The switch switching module 400 of the present embodiment further includes a first bias current unit 402; one end of the first bias current unit 402 is connected to the trigger terminal of the first switch Q1 and the trigger terminal of the second switch Q2, respectively, and the other end of the first bias current unit 402 is connected to the first driving terminal T1, so that the bias current is provided to the trigger terminal of the first switch Q1 and the trigger terminal of the second switch Q2 through the first driving terminal T1.
In the present embodiment, the first bias current unit 402 includes a fifth resistor R5 and a sixth resistor R6.
Specifically, one end of the fifth resistor R5 is connected to the trigger end of the first switch Q1, one end of the sixth resistor R6 is connected to the trigger end of the second switch Q2, the other ends of the fifth resistor R5 and the sixth resistor R6 are respectively connected to the first driving end T1, and the bias current is provided to the trigger end of the first switch Q1 and the trigger end of the second switch Q2 through the first driving end T1, so that the driving capability of the switch switching chip U2 is improved.
In the present embodiment, the first switch Q1 and the second switch Q2 are transistors, and their bases are trigger terminals.
The emitter of the first switch Q1 is connected with the first lamp string 100, the collector of the first switch Q1 is connected with the second driving end T2, and the base of the first switch Q1 is connected with the first adjusting end P1; the emitter of the second switch Q2 is connected to the second string of lights 200, the collector of the second switch Q2 is connected to the second driving terminal T2, and the base of the second switch Q2 is connected to the second adjusting terminal P2.
Fig. 2 is a circuit schematic of a switching dimming LED driving circuit according to a second embodiment.
Referring to fig. 2, in the embodiment of fig. 1, the first switch Q1 and the second switch Q2 are fets whose gates are trigger terminals.
The drain of the first switch Q1 is connected to the first string of lights 100, the source of the first switch Q1 is connected to the second driving terminal T2, and the gate of the first switch Q1 is connected to the first adjusting terminal P1; the drain of the second switch Q2 is connected to the second string of lights 200, the source of the second switch Q2 is connected to the second driving terminal T2, and the gate of the second switch Q2 is connected to the second adjusting terminal P2.
Fig. 3 is a circuit schematic diagram of a switching dimming LED driving circuit according to a third embodiment.
Referring to fig. 3, based on the above description, the switching dimming LED driving circuit of the present embodiment further includes a third switch Q3 and a fourth switch Q4, and the switch switching module 400 further includes a second bias current unit 403; one end of a third switch Q3 is connected with the trigger end of the first switch Q1, the other end of the third switch Q3 is grounded, the trigger end of the third switch Q3 is connected with the first adjusting end P1, one end of a fourth switch Q4 is connected with the trigger end of the second switch Q2, the other end of the fourth switch Q4 is grounded, and the trigger end of the fourth switch Q4 is connected with the second adjusting end P2; one end of the second bias current unit 403 is connected to the trigger terminal of the third switch Q3 and the trigger terminal of the fourth switch Q4, respectively, and the other end of the second bias current unit 403 is connected to the first driving terminal T1, so that the bias current is supplied to the trigger terminal of the third switch Q3 and the trigger terminal of the fourth switch Q4 through the first driving terminal T1.
The principle of the switch switching module 400 controlling the on/off of the first switch Q1 through the third switch Q3 is as follows: specifically, when the first adjustment terminal P1 of the switch switching module 400 keeps outputting at a low level, the third switch Q3 is turned off, the first switch Q1 is turned on by the first bias current unit 402 to turn on the first load circuit, and when the first adjustment terminal P1 of the switch switching module 400 keeps outputting at a high level, the third switch Q3 is turned on to turn on the trigger terminal of the first switch Q1 at a low level, and the first switch Q1 is turned off to turn on the first load circuit.
In the present embodiment, the second bias current unit 403 includes a seventh resistor R7 and an eighth resistor R8.
Specifically, one end of the seventh resistor R7 is connected to the trigger terminal of the third switch Q3, one end of the eighth resistor R8 is connected to the trigger terminal of the fourth switch Q4, the other ends of the seventh resistor R7 and the eighth resistor R8 are respectively connected to the first driving terminal T1, and the bias current is provided to the trigger terminal of the third switch Q3 and the trigger terminal of the fourth switch Q4 through the first driving terminal T1.
Similarly, the switch switching module 400 can also control the on/off of the second switch Q2 through the fourth switch Q4 based on the above principle.
According to a second aspect of the present invention, an LED lamp is provided, where the LED lamp includes the above switching dimming LED driving circuit, and the specific structure of the switching dimming LED driving circuit refers to the above embodiments.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A switching dimming LED driving circuit comprises at least one group of first light strings and at least one group of second light strings, and is characterized by further comprising a first switch, a second switch, a driving module and a switch switching module;
the driving module is provided with a first driving end and a second driving end, and the switch switching module is provided with a first adjusting end and a second adjusting end;
the first driving end, the first lamp string, the first switch and the second driving end are connected in series to form a first load circuit, and the trigger end of the first switch is connected with the first adjusting end;
the first driving end, the second light string, the second switch and the second driving end are connected in series to form a second load circuit, and the trigger end of the second switch is connected with the second adjusting end;
the switch switching module is powered on, so that the first switch and/or the second switch are kept on, and the conducting state of the first load circuit and the conducting state of the second load circuit are cyclically changed according to the power-on times of the switch switching module.
2. The switching dimming LED driving circuit of claim 1, wherein the driving module comprises a driving chip, and the driving chip is JWB1992M constant current type chip.
3. The switching dimming LED driving circuit according to claim 2, wherein the driving module further comprises an input filtering unit, an output filtering unit, and an energy storage unit, the input filtering unit is connected to the power-taking end of the driving chip, the output filtering unit is connected to the first driving end and the second driving end, respectively, and the energy storage unit is disposed in the first load circuit and the second load circuit.
4. The switched dimming LED driver circuit of claim 3, wherein the driver module further comprises a current detection unit;
one end of the current detection unit is connected with the first load circuit and the second load circuit respectively, and one end of the current detection unit is connected with the current detection end of the driving chip.
5. The switching dimming LED driving circuit of claim 1, wherein the switching module comprises a switching chip, an input rectifying unit, a pull-up resistor, a pull-down resistor, and a coupling capacitor;
the input end of the input rectifying unit is connected with the voltage input end of the driving module, the output end of the input rectifying unit is connected with one end of a pull-up resistor, the other end of the pull-up resistor is connected with the power supply voltage end of the switch switching chip, one end of a pull-down resistor is connected with the power supply voltage end of the switch switching chip, the other end of the pull-down resistor is grounded, one end of the coupling capacitor is connected with the working voltage end of the switch switching chip, and the other end of the coupling capacitor is grounded.
6. The switched dimming LED drive circuit of claim 5, wherein the switching module further comprises a first bias current unit;
one end of the first bias current unit is connected with the trigger end of the first switch and the trigger end of the second switch respectively, the other end of the first bias current unit is connected with the first driving end, and bias current is provided for the trigger end of the first switch and the trigger end of the second switch through the first driving end.
7. The switched dimming LED driver circuit of claim 5, further comprising a third switch and a fourth switch, the switch switching module further comprising a second bias current unit;
one end of the third switch is connected with the trigger end of the first switch, the other end of the third switch is grounded, and the trigger end of the third switch is connected with the first adjusting end;
one end of the fourth switch is connected with the trigger end of the second switch, the other end of the fourth switch is grounded, and the trigger end of the fourth switch is connected with the second adjusting end;
one end of the second bias current unit is connected with the trigger end of the third switch and the trigger end of the fourth switch respectively, the other end of the second bias current unit is connected with the first driving end, and bias current is provided for the trigger end of the third switch and the trigger end of the fourth switch through the first driving end.
8. The switched dimming LED driver circuit of any of claims 1-7, wherein the first and second switches are transistors;
an emitting electrode of the first switch is connected with the first lamp string, a collector electrode of the first switch is connected with the second driving end, and a base electrode of the first switch is connected with the first adjusting end;
the emitting electrode of the second switch is connected with the second lamp string, the collector electrode of the second switch is connected with the second driving end, and the base electrode of the second switch is connected with the second adjusting end.
9. The switched dimming LED driver circuit of any of claims 1-7, wherein the first and second switches are field effect transistors;
the drain electrode of the first switch is connected with the first lamp string, the source electrode of the first switch is connected with the second driving end, and the grid electrode of the first switch is connected with the first adjusting end;
the drain electrode of the second switch is connected with the second lamp string, the source electrode of the second switch is connected with the second driving end, and the grid electrode of the second switch is connected with the second adjusting end.
10. An LED lamp comprising the switching dimming LED driving circuit according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121215513.6U CN215734930U (en) | 2021-06-01 | 2021-06-01 | Switching dimming LED drive circuit and LED lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121215513.6U CN215734930U (en) | 2021-06-01 | 2021-06-01 | Switching dimming LED drive circuit and LED lamp |
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| CN215734930U true CN215734930U (en) | 2022-02-01 |
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