CN215222542U - Low-cost dimming circuit - Google Patents
Low-cost dimming circuit Download PDFInfo
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- CN215222542U CN215222542U CN202120408804.0U CN202120408804U CN215222542U CN 215222542 U CN215222542 U CN 215222542U CN 202120408804 U CN202120408804 U CN 202120408804U CN 215222542 U CN215222542 U CN 215222542U
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Abstract
The utility model discloses a low-cost dimming circuit, which comprises a first light source module, a second light source module, a switch module and a power supply module; the first light source module and the second light source module are light sources with different color temperatures, and the breakover voltage of the first light source module is greater than the breakover voltage of the second light source module; the second light source module is connected with the switch module in series and then connected with the first light source module in parallel, and two ends of the first light source module are respectively electrically connected with the power supply module. Adopt the utility model discloses, can adjust the colour temperature of light source, have simple structure, the strong and low-cost advantage of security.
Description
Technical Field
The utility model relates to a field of adjusting luminance especially relates to a low-cost dimmer circuit.
Background
There are several common methods of color temperature drive: the method comprises the following steps of 1, performing 2 groups of driving, respectively driving a light source 1 and a light source 2, wherein the light source 1 and the light source 2 have different color temperatures, and adjusting the current of the 2 groups of light sources to change the color temperature; the method 2, making a constant voltage drive, making a constant current module by using a low voltage linear IC or a transistor, and adjusting the color temperature by switching on a light source 1 and a light source 2 controlled by a switching tube; the method 3, making a constant voltage and constant current drive, and controlling the conduction of the light source 1 and the light source 2 controlled by the switching tube to adjust the color temperature by utilizing the constant current function of the drive; and 4, performing a group of constant current driving, and adjusting the color temperature by adjusting the conduction ratio of the light source 1 and the light source 2 by using a group of complementary MOS switches, wherein a similar chip has the BP5926 of a crystal abundance source.
However, the method 1 has high cost and large volume and is gradually eliminated at present; the method 2 is more common in the low-power RGB control, the low-voltage linear IC is not low in price, the heating loss is large, the precision of a constant current circuit manufactured by a transistor is low, and the current is greatly influenced by the temperature; the method 3 is the mainstream at present, but the constant voltage and constant current IC is higher in price, more complex in circuit and higher in design requirement on driving; method 4 is a new method recently appeared, but requires a better overvoltage protection circuit for constant current driving, otherwise, a built-in MOS is very easy to break down, and the chip is not cheap.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a low-cost dimmer circuit is provided, can adjust the colour temperature of light source, has simple structure, security strong and low-cost advantage.
In order to solve the above technical problem, the present invention provides a low-cost light modulation circuit, which includes a first light source module, a second light source module, a switch module and a power supply module; the first light source module and the second light source module are light sources with different color temperatures, and the breakover voltage of the first light source module is greater than the breakover voltage of the second light source module; the second light source module is connected with the switch module in series and then connected with the first light source module in parallel, and two ends of the first light source module are respectively electrically connected with the power supply module.
Preferably, the low-cost dimming circuit further comprises an MCU module, the switch module and the power supply module are electrically connected to the MCU module, and the MCU module is used to control the switch of the switch module.
Preferably, the switch module comprises a first switch submodule and a second switch submodule; the MCU module is electrically connected with the first switch submodule and used for controlling the on-off of the first switch submodule, and the first switch submodule is electrically connected with the second switch submodule and used for controlling the on-off of the second switch submodule.
Preferably, the first switch submodule includes a first resistor, a second resistor and a triode; the base electrode of the triode is electrically connected with the MCU module through the first resistor; the emitter of the triode is grounded; and the collector of the triode is electrically connected with the second switch submodule through the second resistor.
Preferably, the second switch submodule comprises a diode, a third resistor and a MOS transistor; the grid electrode of the MOS tube is electrically connected with the collector electrode of the triode through the second resistor; the source electrode of the MOS tube is electrically connected with the power supply module, the source electrode and the drain electrode of the MOS tube are electrically connected through the third resistor, and the diode is connected with the third resistor in parallel; and the drain electrode of the MOS tube is electrically connected with the second light source module.
Preferably, the power supply module comprises a constant current driving power supply submodule and an MCU power supply submodule; the output end of the constant current driving power supply submodule is electrically connected with two ends of the first light source module; the MCU power supply sub-module is used for supplying power to the MCU module, and the MCU module is electrically connected with the constant current driving power supply sub-module and is used for controlling the output current of the constant current driving power supply sub-module.
Preferably, the first light source module and the second light source module are both composed of at least one LED, and the number of LEDs of the first light source module and the second light source module is equal.
Preferably, the first light source module includes a first LED branch and a second LED branch, the first LED branch and the second LED branch are connected in parallel, the first LED branch and the second LED branch each include N LEDs connected in series in sequence, where N is a positive integer.
Preferably, the second light source module includes a third LED branch, a fourth LED branch and a fifth LED branch, the third LED branch, the fourth LED branch and the fifth LED branch are connected in parallel, the third LED branch, the fourth LED branch and the fifth LED branch include M LEDs sequentially connected in series, where M is 2N/3, and M is a positive integer.
Preferably, the low-cost dimming circuit further comprises an isolation module, the MCU module is connected to the switch module through the isolation module, and the isolation module is an optocoupler.
Implement the utility model has the advantages that:
the utility model comprises a first light source module, a second light source module, a switch module and a power supply module; the first light source module and the second light source module are light sources with different color temperatures, and the breakover voltage of the first light source module is greater than the breakover voltage of the second light source module; the second light source module is connected with the switch module in series and then connected with the first light source module in parallel, and two ends of the first light source module are respectively electrically connected with the power supply module. By adopting the utility model, the color temperature of the light source can be adjusted, the switch module has the advantages of simple structure, strong safety and low cost, when the switch module is turned off, the current passes through the first light source module, when the switch module is turned on, the current passes through the second light source module because the on-state voltage of the second light source module is lower; due to the bypass of the first light source module, the switch module can select a switch tube with lower withstand voltage, has lower on-resistance, smaller device volume and lower material cost, and does not have the breakdown risk.
Drawings
Fig. 1 is a schematic block diagram of a first embodiment of a low-cost dimming circuit provided by the present invention;
fig. 2 is a schematic block diagram of a second embodiment of a low-cost dimming circuit provided by the present invention;
fig. 3 is a schematic diagram of a switch module circuit of the low-cost light modulation circuit provided by the present invention;
fig. 4 is a schematic block diagram of the first light source module and the second light source module of the low-cost light modulation circuit provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings. Only this statement, the utility model discloses the upper and lower, left and right, preceding, back, inside and outside etc. position words that appear or will appear in the text only use the utility model discloses an attached drawing is the benchmark, and it is not right the utility model discloses a concrete restriction.
As shown in fig. 1, the present invention provides a low-cost light modulation circuit, which includes a first light source module 1, a second light source module 2, a switch module 3 and a power supply module 4; the first light source module 1 and the second light source module 2 are light sources with different color temperatures, and the breakover voltage of the first light source module 1 is greater than the breakover voltage of the second light source module 2; the second light source module 2 is connected in series with the switch module 3 and then connected in parallel with the first light source module 1, and two ends of the first light source module 1 are electrically connected with the power supply module 4 respectively.
The utility model discloses, can adjust the colour temperature of light source, have simple structure, the security is strong and low-cost advantage, when switch module 3 cuts off, the electric current passes through from first light source module 1, when switch module 3 switches on, because the turn-on voltage of second light source module 2 is lower, the electric current passes through from second light source module 2; due to the bypass of the first light source module 1, the switch module 3 can select a switch tube with lower withstand voltage, has lower on-resistance, smaller device volume and lower material cost, and does not have the breakdown risk.
As shown in fig. 2, preferably, the low-cost dimming circuit further includes an MCU module 5, the switch module 3 and the power supply module 4 are both electrically connected to the MCU module 5, and the MCU module 5 is configured to control the switch of the switch module 3. It should be noted that the MCU module 5 may adopt a single chip microcomputer. The singlechip integrates various components such as an arithmetic unit, a controller, a memory, an input/output device and the like, and realizes various functions such as signal processing, data storage and the like. For example, an arithmetic unit includes a large number of comparison circuits, and can perform logical operation processing on a received signal instruction. Preferably, the single chip microcomputer can adopt models including but not limited to AT78C 51.
Specifically, the MCU module 5 controls the on/off of the switching module by sending a PWM pulse control signal.
As shown in fig. 3, further, the switch module includes a first switch submodule and a second switch submodule; the MCU module is electrically connected with the first switch submodule and used for controlling the on-off of the first switch submodule, and the first switch submodule is electrically connected with the second switch submodule and used for controlling the on-off of the second switch submodule.
Preferably, the first switch submodule includes a first resistor R4, a second resistor R3, and a transistor Q2; the base electrode of the triode is electrically connected with the MCU module (PWM2) through the first resistor; the emitter of the triode is grounded; and the collector of the triode is electrically connected with the second switch submodule through the second resistor.
Preferably, the second switching submodule includes a diode D1, a third resistor R1, and a MOS transistor Q1; the grid electrode of the MOS tube is electrically connected with the collector electrode of the triode through the second resistor; the source electrode of the MOS tube is electrically connected with the power supply module (VIN), the source electrode and the drain electrode of the MOS tube are electrically connected through the third resistor, and the diode is connected with the third resistor in parallel; and the drain electrode of the MOS tube is electrically connected with the second light source module (through a pin 3).
Further, the power supply module 4 includes a constant current driving power supply sub-module 401 and an MCU power supply sub-module 402; the output end of the constant current driving power supply submodule 401 is electrically connected with two ends of the first light source module 1; the MCU power supply module 402 is configured to supply power to the MCU module 5, and the MCU module 5 is electrically connected to the constant current driving power supply module 401 and configured to control the output current of the constant current driving power supply module 401.
It should be noted that the MCU power supply sub-module 402 is composed of a voltage conversion chip and peripheral circuits thereof, and the current output by the constant current driving power supply sub-module 401 is controlled by the MCU module 5.
As shown in fig. 4, preferably, the first light source module 1 and the second light source module 2 are each composed of at least one LED, and the number of LEDs of the first light source module 1 and the second light source module 2 is equal. The utility model discloses a realize the effect of adjusting luminance than ideal, the quantity of first light source module 1 and second light source module 2's LED equals.
Further, the first light source module 1 includes a first LED branch 101 and a second LED branch 102, the first LED branch 101 and the second LED branch 102 are connected in parallel, the first LED branch 101 and the second LED branch 102 both include N LEDs sequentially connected in series, where N is a positive integer. Preferably, the second light source module 2 includes a third LED branch 201, a fourth LED branch 202, and a fifth LED branch 203, the third LED branch 201, the fourth LED branch 202, and the fifth LED branch 203 are connected in parallel, and the third LED branch 201, the fourth LED branch 202, and the fifth LED branch 203 each include M LEDs connected in series in sequence, where M is 2N/3, and M is a positive integer.
It should be noted that, in order to avoid the light flux of the second light source module 2 being lower than that of the first light source module 1, the present invention uses a circuit design, in which the first light source module 1 adopts a 2-to-30-string design, and the second light source module 2 adopts a 3-to-20-string design, so as to obtain the voltage of the first light source module 1 being 30U and the voltage of the second light source module 2 being 20U, where U is the voltage of each LED, but is not limited thereto; meanwhile, the utility model discloses a MCU module 5 adjusts constant current drive power supply submodule 401 output current size, promptly: when the switch module 3 is turned on, the second light source module 2 works, and the magnitude of the output current of the constant current driving power supply sub-module 401 is I, so that the power of the second light source module during working is 20 UI; when the switch module 3 is turned off, the first light source module 1 works, and the magnitude of the output current of the constant current driving power supply sub-module 401 is 2I/3, so that the power of the second light source module in working is 20 UI; therefore, the output power of the light source is consistent at any time, and an ideal dimming effect is achieved.
Preferably, the low-cost dimming circuit further comprises an isolation module, the MCU module is connected to the switch module through the isolation module, and the isolation module is an optocoupler.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (10)
1. A low-cost dimming circuit is characterized by comprising a first light source module, a second light source module, a switch module and a power supply module;
the first light source module and the second light source module are light sources with different color temperatures, and the breakover voltage of the first light source module is greater than the breakover voltage of the second light source module;
the second light source module is connected with the switch module in series and then connected with the first light source module in parallel, and two ends of the first light source module are respectively electrically connected with the power supply module.
2. The low-cost dimming circuit according to claim 1, further comprising an MCU module, wherein the switching module and the power supply module are electrically connected to the MCU module, and the MCU module is configured to control the switching of the switching module.
3. The low-cost dimming circuit of claim 2, wherein the switching module comprises a first switching submodule and a second switching submodule;
the MCU module is electrically connected with the first switch submodule and is used for controlling the on-off of the first switch submodule,
the first switch submodule is electrically connected with the second switch submodule and is used for controlling the on-off of the second switch submodule.
4. The low-cost dimming circuit of claim 3, wherein the first switching submodule comprises a first resistor, a second resistor, and a triode;
the base electrode of the triode is electrically connected with the MCU module through the first resistor;
the emitting electrode of the triode is grounded;
and the collector of the triode is electrically connected with the second switch submodule through the second resistor.
5. The low-cost dimming circuit according to claim 4, wherein the second switching submodule comprises a diode, a third resistor and a MOS transistor;
the grid electrode of the MOS tube is electrically connected with the collector electrode of the triode through the second resistor;
the source electrode of the MOS tube is electrically connected with the power supply module, the source electrode and the drain electrode of the MOS tube are electrically connected through the third resistor, and the diode is connected with the third resistor in parallel;
and the drain electrode of the MOS tube is electrically connected with the second light source module.
6. The low-cost dimming circuit according to claim 2, wherein the power supply module comprises a constant current driving power supply sub-module and an MCU power supply sub-module;
the output end of the constant current driving power supply submodule is electrically connected with two ends of the first light source module;
the MCU power supply module is used for supplying power to the MCU module,
the MCU module is electrically connected with the constant current driving power supply submodule and is used for controlling the output current of the constant current driving power supply submodule.
7. The low-cost dimming circuit according to claim 1, wherein the first light source module and the second light source module are each composed of at least one LED, and the number of LEDs of the first light source module and the second light source module is equal.
8. The low-cost dimming circuit according to claim 7, wherein the first light source module comprises a first LED branch and a second LED branch, the first LED branch and the second LED branch are connected in parallel, and each of the first LED branch and the second LED branch comprises N LEDs connected in series, wherein N is a positive integer.
9. The low-cost dimming circuit according to claim 8, wherein the second light source module comprises a third LED branch, a fourth LED branch and a fifth LED branch, the third LED branch, the fourth LED branch and the fifth LED branch are connected in parallel with each other, and the third LED branch, the fourth LED branch and the fifth LED branch each comprise M LEDs connected in series in sequence, where M is 2N/3, and M is a positive integer.
10. The low-cost dimming circuit according to claim 2, further comprising an isolation module, wherein the MCU module is connected to the switch module through the isolation module, and the isolation module is an optocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120408804.0U CN215222542U (en) | 2021-02-24 | 2021-02-24 | Low-cost dimming circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120408804.0U CN215222542U (en) | 2021-02-24 | 2021-02-24 | Low-cost dimming circuit |
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| Publication Number | Publication Date |
|---|---|
| CN215222542U true CN215222542U (en) | 2021-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120408804.0U Active CN215222542U (en) | 2021-02-24 | 2021-02-24 | Low-cost dimming circuit |
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|---|---|
| CN (1) | CN215222542U (en) |
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2021
- 2021-02-24 CN CN202120408804.0U patent/CN215222542U/en active Active
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Denomination of utility model: A low-cost dimming circuit Effective date of registration: 20231122 Granted publication date: 20211217 Pledgee: Guangdong Nanhai Rural Commercial Bank branch branch of Limited by Share Ltd. Pledgor: FOSHAN EVERCORE OPTOELECTRONIC TECHNOLOGY CO.,LTD. Registration number: Y2023980066635 |