CN211429572U - Dimming depth control circuit for boosting constant-current dimming circuit - Google Patents
Dimming depth control circuit for boosting constant-current dimming circuit Download PDFInfo
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- CN211429572U CN211429572U CN201921761746.9U CN201921761746U CN211429572U CN 211429572 U CN211429572 U CN 211429572U CN 201921761746 U CN201921761746 U CN 201921761746U CN 211429572 U CN211429572 U CN 211429572U
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Abstract
The utility model provides a dimming depth control circuit for a boosting constant current dimming circuit, which comprises a constant voltage source circuit, an LDO conversion circuit, an LED constant current driving circuit, a Bluetooth module and an uncontrollable circuit for preventing Bluetooth driving, wherein the constant voltage source circuit is connected with the LDO conversion circuit and the LED constant current driving circuit, and the LDO conversion circuit is connected with the Bluetooth module and a power input end of the uncontrollable circuit for preventing Bluetooth driving; the PWM signal output end of the Bluetooth module is connected with the PWM signal input end of the uncontrollable circuit for preventing the Bluetooth from driving, and the Bluetooth module is connected with the PWM enabling signal input end of the LED constant current driving circuit. The utility model discloses when using bluetooth module output PWM signal drive adjustment constant current IC current output to reach minimum 5%, through using another way PWM enable signal to control constant current IC's enable pin, make constant current IC be in continuous opening and closed condition, 5% constant current output current opens the shutoff along with PWM enable signal constantly to realize that output current value reaches 0.5% from minimum 5%, make the degree of depth of adjusting luminance reach 0.5%.
Description
Technical Field
The utility model relates to a constant current dimming circuit technical field, concretely relates to a degree of depth control circuit that adjusts luminance for constant current dimming circuit steps up.
Background
The LED light source is very flexible in application and can be made into light, thin, short and small products in various forms of points, lines and surfaces; the LED is very convenient to control, and the light can be adjusted at will only by adjusting the current; the combination of different light colors is varied, and a time sequence control circuit is utilized to achieve a colorful dynamic change effect. LEDs have been widely used in a variety of lighting applications, such as battery powered flashlights, miniature voice operated lights, security lights, outdoor road and indoor stair lights, and building and signage continuous lights.
The common LED constant-current dimming circuit realizes dimming by adjusting the output current Iout, and the ratio of the minimum current value Iout-min to the maximum current value Iout-max which can be adjusted is the dimming depth.
The current regulating method of the existing constant current dimming circuit is to control the voltage V of the current sampling pin FB by using a module (Bluetooth, WiFi, zigbee, etc.) to output a PWM signalfbAnd the FB sampling voltage and the FB reference voltage V of the constant current chip are compared0Compared with the prior art, the dimming depth of the PWM dimming control mode can only reach about 5 percent.
SUMMERY OF THE UTILITY MODEL
The utility model discloses not enough to above-mentioned prior art and provide a degree of depth control circuit that adjusts luminance for stepping up constant current dimming circuit, solved and made the LED adjust luminance the degree of depth and reach 0.5% technical problem.
The utility model discloses a solve the technical scheme that above-mentioned problem adopted and do:
the utility model provides a dimming depth control circuit for boost constant current dimming circuit, including constant voltage source circuit, LDO converting circuit, LED constant current drive circuit, bluetooth module, prevent the uncontrollable circuit of bluetooth drive, the constant voltage output of constant voltage source circuit connects first constant voltage input VIN1 of LDO converting circuit and the second constant voltage input VIN2 of LED constant current drive circuit, the conversion voltage output 3.3V of LDO converting circuit connects the first power input VCC of bluetooth module and prevents the second power input of the uncontrollable circuit of bluetooth drive;
a PWM signal output end PWM1 of the Bluetooth module is connected with a PWM signal input end of the Bluetooth drive prevention uncontrollable circuit, and an FB dimming control output end of the Bluetooth drive prevention uncontrollable circuit is connected with an FB dimming control input end of the LED constant current drive circuit; and a PWM (pulse-width modulation) enabling signal output end EN-W1 of the Bluetooth module is connected with a PWM enabling signal input end of the LED constant current driving circuit, and a constant current output end of the LED constant current driving circuit is connected with an LED lamp load.
Furthermore, the constant voltage source circuit comprises an LC filter circuit, the LC filter circuit is provided with a first inductor, a second inductor, a first capacitor and a second capacitor, two ends of the first capacitor are respectively connected with front ends of the first inductor and the second inductor, and two ends of the second capacitor are respectively connected with rear ends of the first inductor and the second inductor.
Furthermore, the LDO conversion circuit is provided with a voltage stabilization chip, an input end of the voltage stabilization chip is the first constant voltage input end VIN1, an output end of the voltage stabilization chip is the conversion voltage output end 3.3V, and an input end and an output end of the voltage stabilization chip are respectively connected with the third capacitor and the fourth capacitor.
Furthermore, the LED constant current driving circuit is provided with an LED boosting driving chip, a power supply input pin of the LED boosting driving chip is connected with the second constant voltage input end VIN2, a PWM enabling signal input pin of the LED boosting driving chip is connected with the PWM enabling signal output end EN-W1, and an FB dimming control input pin of the LED boosting driving chip is connected with an FB dimming control output end for preventing the Bluetooth from driving the uncontrollable circuit.
Further, bluetooth module is equipped with the bluetooth module, and the bluetooth module is equipped with first power input VCC, PWM signal output part PWM1 and PWM enable signal output part EN-W1.
Furthermore, the circuit for preventing the Bluetooth from driving the uncontrollable circuit is provided with a triode, an emitting electrode of the triode is grounded, a base electrode of the triode is connected with the PWM signal input end, a collector electrode of the triode is connected with the second power supply input end, and the collector electrode of the triode is also connected with an FB dimming control input end of the LED constant current driving circuit after passing through the RC filter circuit.
The beneficial effects of the utility model reside in that: the utility model provides a degree of depth control circuit that adjusts luminance for constant current dimming circuit steps up is using bluetooth module output PWM signal drive adjustment constant current IC current output to reach when 5% minimum, control constant current IC's enable pin through using another way PWM enable signal, make constant current IC be in continuous opening and closed state, 5% constant current output current is along with PWM enable signal opens the shutoff constantly, thereby realize that output current value reaches 0.5% from 5% minimum, make the degree of depth of adjusting luminance reach 0.5%.
Drawings
Fig. 1 is a schematic structural diagram of a dimming depth control circuit for a boost constant current dimming circuit according to the present invention; fig. 2 is a circuit diagram of the constant voltage power supply circuit of the present invention;
FIG. 3 is a circuit diagram of the LDO switching circuit of the present invention;
fig. 4 is a circuit diagram of the LED constant current driving circuit of the present invention;
fig. 5 is a circuit diagram of the bluetooth module of the present invention;
fig. 6 is a circuit diagram of the uncontrollable circuit for preventing bluetooth driving in the present invention;
fig. 7 is a schematic circuit diagram of the circuits of fig. 2, 4 and 6.
Detailed Description
The following embodiments of the present invention are specifically explained with reference to the accompanying drawings, which are used for reference and illustration only and do not limit the scope of the present invention.
As shown in FIGS. 1-7, the utility model provides a dimming depth control circuit for boost constant current dimming circuit, including constant voltage source circuit, LDO converting circuit, LED constant current driving circuit, bluetooth module, prevent the uncontrollable circuit of bluetooth drive, the constant voltage output of constant voltage source circuit connects first constant voltage input VIN [1] of LDO converting circuit and second constant voltage input VIN [2] of LED constant current driving circuit, the converted voltage output of LDO converting circuit +3.3V [1,2] connects the first power input VCC of bluetooth module and prevents the second power input of the uncontrollable circuit of bluetooth drive; the PWM signal output end PWM1[1] of the Bluetooth module is connected with the PWM signal input end of the Bluetooth drive prevention uncontrollable circuit, and the FB dimming control output end of the Bluetooth drive prevention uncontrollable circuit is connected with the FB dimming control input end of the LED constant current drive circuit; the PWM enable signal output end EN-W1 of the Bluetooth module is connected with the PWM enable signal input end of the LED constant current drive circuit, and the constant current output end of the LED constant current drive circuit is connected with the LED lamp load.
In this embodiment, as shown in fig. 2, the constant voltage power supply circuit includes an LC filter circuit, the LC filter circuit is provided with a first inductor L1, a second inductor L2, a first capacitor C3, and a second capacitor C4, two ends of the first capacitor C3 are respectively connected to front ends of the first inductor L1 and the second inductor L2, and two ends of the second capacitor C4 are respectively connected to rear ends of the first inductor L1 and the second inductor L2.
IN this embodiment, as shown IN fig. 3, the LDO conversion circuit is provided with a voltage regulation chip U4, an input terminal IN of the voltage regulation chip U4 is the first constant voltage input terminal VIN1, an output terminal OUT of the voltage regulation chip U4 is the converted voltage output terminal +3.3V [1,2], and the input terminal IN and the output terminal OUT of the voltage regulation chip are respectively connected to the third capacitor C33 and the fourth capacitor C34.
IN this embodiment, as shown IN fig. 4, the LED constant current driving circuit is provided with an LED boost driving chip U1, a power input pin IN 7 of the LED boost driving chip U1 is connected to the second constant voltage input terminal VIN [2], a PWM enable signal input pin PWM 9 of the LED boost driving chip U1 is connected to the PWM enable signal output terminal EN-W [1], and an FB dimming control input pin FB of the LED boost driving chip U1 is connected to an FB dimming control output terminal FB-CO for preventing the bluetooth from driving the uncontrollable circuit.
In this embodiment, as shown in fig. 5, the bluetooth module is provided with a bluetooth module U3, and the bluetooth module U3 is provided with a first power input terminal VCC, a PWM signal output terminal PWM [1] and a PWM enable signal output terminal EN-W [1 ].
In this embodiment, the bluetooth module is characterized in that: PWM1, PWM2 controls the constant current output percentage of the constant current IC; the EN-C, EN-W, the EN-PWM signal, is used to control the on and off of the constant current IC.
In this embodiment, as shown in fig. 6, the circuit for preventing the uncontrollable bluetooth driving is provided with a transistor Q2, an emitter E of a transistor Q2 is grounded, a base B of a transistor Q2 is connected to the PWM signal input terminal PWM1[1], a collector C of a transistor Q2 is connected to the second power input terminal +3.3V [1,2], and a collector of a transistor Q2 is further connected to an FB dimming control input terminal FB-CI of the LED constant current driving circuit through an RC filter circuit.
In this embodiment, the characteristics of preventing the bluetooth from driving the uncontrollable circuit and the PWM control signal are: when the Bluetooth module is powered on, the constant current output of the constant current module is turned off by a circuit of 3.3V, and the constant current is output only after the Bluetooth module outputs a PWM signal to be turned on.
The utility model discloses a working process does: as shown in fig. 2, an adapter of the constant voltage source circuit outputs 12VDC to supply power to the LDO conversion circuit and the LED boosting constant current driving circuit, and a constant current output terminal of the LED boosting constant current driving circuit is connected to an LED lamp of a load 21V; LDO converting circuit provides 3.3V voltage and supplies power for the bluetooth module, also gives 3.3V voltage power supply simultaneously and prevents the uncontrollable circuit of bluetooth module drive, dies output current lock when the bluetooth does not start, drives the back when bluetooth module is complete, sends an EN PWM signal and starts constant current drive circuit IC to the PWM signal drive that the cooperation bluetooth module output adjusts IC constant current value, realizes adjusting luminance.
In the above embodiment, after the maximum output current Iout-max is set by the current sampling resistors R1 and R10, the boost constant-current dimming circuit adjusts the output current by adjusting the ratio of the voltage Vfb of the FB pin of the constant-current IC (obtained by dividing the PWM effective voltage by R9, R18, and 1R 9) and the reference voltage V0 built in the FB pin of the constant-current IC by the PWM signal.
The output current Iout is Iou _ max (Vfb/V0)%, and a constant current of several percent is controlled by the PWM signal. Since V0 is small, Vfb accuracy is determined by voltage dividing resistance, PWM is at least 1%, and output current is generally only 5% for current stabilization.
The utility model provides a degree of depth control circuit that adjusts luminance for constant current dimming circuit steps up through two signal control constant current IC: one path of PWM regulates the constant current value of the constant current IC, and the other path of EN-PWM signal switches the constant current IC. After the output current is regulated to the minimum by PWM, the constant current IC is switched on and off by EN-PWM, and the output current is further reduced. Therefore, the circuit adds another path of EN-PWM to control the start and the close of the constant current IC, thus after the output current is regulated to be minimum by using PWM, the EN-PWM controls the switch of the IC to further regulate the output current to be smaller to realize the output current: iout — Iout _ max (Vfb/v0) EN — PWM%. This also reduces the output current from 5% to 0.5%. Therefore, the dimming depth of the boost constant-current circuit reaches 0.5% or even lower.
That is to say, in the dimming process, when the current output of the constant current IC is adjusted to be 5% at the lowest by using the bluetooth module to output the PWM signal, the EN pin of the constant current IC is controlled by using the other EN-PWM, so that the constant current IC is in a continuous on and off state, 5% of the constant current output current is continuously turned on and off along with the EN-PWM, and thus the output current Iout is equivalent to EN-PWM%. the Iout-min, thereby realizing that the output current value reaches 0.5% from 5% at the lowest and the dimming depth reaches 0.5%.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (6)
1. The utility model provides a degree of depth control circuit that adjusts luminance for stepping up constant current dimming circuit which characterized in that: the constant voltage output end of the constant voltage source circuit is connected with a first constant voltage input end of the LDO conversion circuit and a second constant voltage input end of the LED constant current driving circuit, and the conversion voltage output end of the LDO conversion circuit is connected with a first power input end of the Bluetooth module and a second power input end of the Bluetooth drive prevention uncontrollable circuit; the PWM signal output end of the Bluetooth module is connected with the PWM signal input end of the Bluetooth drive prevention uncontrollable circuit, and the FB dimming control output end of the Bluetooth drive prevention uncontrollable circuit is connected with the FB dimming control input end of the LED constant current drive circuit; the PWM enabling signal output end of the Bluetooth module is connected with the PWM enabling signal input end of the LED constant current driving circuit, and the constant current output end of the LED constant current driving circuit is connected with an LED lamp load.
2. The dimming depth control circuit for a boost constant current dimming circuit according to claim 1, wherein: the constant voltage source circuit comprises an LC filter circuit, the LC filter circuit is provided with a first inductor, a second inductor, a first capacitor and a second capacitor, the two ends of the first capacitor are respectively connected with the front ends of the first inductor and the second inductor, and the two ends of the second capacitor are respectively connected with the rear ends of the first inductor and the second inductor.
3. The dimming depth control circuit for a boost constant current dimming circuit according to claim 1, wherein: the LDO conversion circuit is provided with a voltage stabilization chip, the input end of the voltage stabilization chip is the first constant voltage input end, the output end of the voltage stabilization chip is the conversion voltage output end, and the input end and the output end of the voltage stabilization chip are respectively connected with a third capacitor and a fourth capacitor.
4. The dimming depth control circuit for a boost constant current dimming circuit according to claim 1, wherein: the LED constant current driving circuit is provided with an LED boosting driving chip, a power supply input pin of the LED boosting driving chip is connected with the second constant voltage input end, a PWM enabling signal input pin of the LED boosting driving chip is connected with the PWM enabling signal output end, and an FB dimming control input pin of the LED boosting driving chip is connected with an FB dimming control output end for preventing the Bluetooth driving uncontrollable circuit.
5. The dimming depth control circuit for a boost constant current dimming circuit according to claim 1, wherein: the Bluetooth module is provided with a Bluetooth module, and the Bluetooth module is provided with a first power input end, a PWM signal output end and a PWM enabling signal output end.
6. The dimming depth control circuit for a boost constant current dimming circuit according to claim 1, wherein: the circuit for preventing the Bluetooth from driving the uncontrollable circuit is provided with a triode, an emitting electrode of the triode is grounded, a base electrode of the triode is connected with the PWM signal input end, a collector electrode of the triode is connected with the second power input end, and the collector electrode of the triode is also connected with an FB dimming control input end of the LED constant current driving circuit after passing through an RC filter circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921761746.9U CN211429572U (en) | 2019-10-21 | 2019-10-21 | Dimming depth control circuit for boosting constant-current dimming circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921761746.9U CN211429572U (en) | 2019-10-21 | 2019-10-21 | Dimming depth control circuit for boosting constant-current dimming circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112601325A (en) * | 2020-12-31 | 2021-04-02 | 珠海雷特科技股份有限公司 | Intelligent lamp and driving power supply thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112601325A (en) * | 2020-12-31 | 2021-04-02 | 珠海雷特科技股份有限公司 | Intelligent lamp and driving power supply thereof |
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