CN213662013U

CN213662013U - Tristate LED lamp control circuit

Info

Publication number: CN213662013U
Application number: CN202022720725.1U
Authority: CN
Inventors: 张继涛; 张艺凡; 王利; 刘胜泉
Original assignee: Zhongshan Polytechnic
Current assignee: Zhongshan Polytechnic
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-07-09
Anticipated expiration: 2030-11-20

Abstract

The utility model discloses a tristate LED lamp accuse circuit, include: the device comprises a main control module, a PWM (pulse width modulation) module and an isolation module, wherein the main control module comprises a first output end and a second output end which can output high and low levels; the PWM modulation module comprises a first input end and a second input end; the first output end is connected with the first input end through the isolation module, and the second output end is connected with the second input end through the isolation module; the first output end and the second output end can output a plurality of groups of control signals in a combined mode, the control signals can be accurately input into the PWM modulation module through the isolation module, the PWM modulation module modulates corresponding various PWM driving signals according to the plurality of groups of control signals to drive the light source, and therefore the illumination state of the light source is not interfered by other signals.

Description

Tristate LED lamp control circuit

Technical Field

The utility model relates to the field of lighting technology, especially a tristate LED lamp accuse circuit.

Background

The tri-state of the tri-state LED lamp refers to three states of off, low bright and high bright, and is generally used for lighting of urban roads, and the tri-state LED lamp is in an off state in the daytime; in the evening, when the ambient light intensity is lower than the threshold value of the on-light intensity, the tri-state LED lamp is turned on and simultaneously runs at low power to illuminate at low brightness; when a person moves in the detection range, the tri-state LED lamp illuminates at high brightness, and when the person leaves the detection range or is still, the tri-state LED lamp illuminates at low brightness after delaying for a period of time, so that illumination on demand is realized, intelligent energy conservation is realized, and the steps are repeated in such a way until the tri-state LED lamp is turned off in the day; the tristate LED lamp control circuit is easy to be interfered by other signals to enable the high brightness state and the low brightness state of the LED lamp to be irregularly switched, and in order to solve the problem, the existing tristate LED lamp control circuit is provided with an isolating circuit between a PWM circuit and an LED power circuit to resist interference, but the anti-interference capability is not strong, when the input end of the PWM circuit is interfered, the generated PWM signal is inaccurate, the high brightness state and the low brightness state of the LED lamp can be irregularly switched, and illumination is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide a tristate LED lamp control circuit that the interference killing feature is strong.

According to the utility model discloses a tristate LED lamp accuse circuit, include: the device comprises a main control module, a PWM (pulse width modulation) module and an isolation module, wherein the main control module comprises a first output end and a second output end which can output high and low levels; the PWM modulation module comprises a first input end and a second input end; the first output end is connected with the first input end through the isolation module, and the second output end is connected with the second input end through the isolation module; the PWM modulation module can modulate and form various PWM driving signals according to the signals acquired by the first input end and the second input end.

According to the utility model discloses tristate LED lamp accuse circuit has following beneficial effect at least: the isolation module can isolate other interference signals, the first output end and the second output end can output a plurality of groups of control signals in a combined mode, the control signals can be accurately input into the PWM modulation module through the isolation module, the PWM modulation module modulates corresponding various PWM driving signals according to the plurality of groups of control signals to drive the light source, and the illumination state of the light source is not interfered by other signals.

According to some embodiments of the present invention, the isolation module comprises a first isolation circuit and a second isolation circuit, an input end of the first isolation circuit is electrically connected to the first output end, and an output end of the first isolation circuit is electrically connected to the first input end, so that a signal of the first output end is accurately input to the first input module through the first isolation circuit; the input end of the second isolation circuit is electrically connected with the second output end, the output end of the second isolation circuit is electrically connected with the second input end, so that signals of the second output end are accurately input to the second input end through the second isolation circuit, and the circuit is simple in structure and convenient to realize.

According to some embodiments of the present invention, the first isolation circuit includes a first optical coupler, a resistor R6 and a resistor R7, the first optical coupler includes a first light emitter and a first light receiver, one end of the resistor R6 and one end of the resistor R7 are respectively electrically connected to the first output terminal, the other end of the resistor R6 is electrically connected to the input terminal of the first light emitter, the other end of the resistor R7 and the output terminal of the first light emitter are respectively grounded, the output terminal of the first light receiver is electrically connected to the first input terminal, and the input terminal of the first light receiver is connected to an external power supply; the first optical coupler has good isolation effect on input and output electric signals, so that the transmission of the electric signals between the first output end and the first input end has unidirectionality, and the optical fiber coupler has good electric insulation and anti-interference functions, is simple in circuit structure and is convenient to realize.

According to some embodiments of the present invention, the second isolation circuit includes a second optical coupler, a resistor R8 and a resistor R9, the second optical coupler includes a second light emitter and a second light receiver, one end of the resistor R8 and one end of the resistor R9 are respectively electrically connected to the second output terminal, the other end of the resistor R8 is electrically connected to the input terminal of the second light emitter, the other end of the resistor R9 and the output terminal of the second light emitter are respectively grounded, the output terminal of the second light receiver is electrically connected to the second input terminal, and the input terminal of the second light receiver is connected to an external power supply; the second optical coupler has good isolation effect on input and output electric signals, so that the transmission of the electric signals between the second output end and the second input end has unidirectionality, and the optical fiber coupler has good electric insulation and anti-interference functions, is simple in circuit structure and is convenient to realize.

According to the utility model discloses a some embodiments still include voltage stabilizing module, voltage stabilizing module's input is connected with the external power supply electricity, voltage stabilizing module's output respectively with PWM modulation module with keep apart the module electricity and connect, guarantee the stable transmission of signal.

According to some embodiments of the present invention, the apparatus further comprises an online programming module, the online programming module comprises a clock interface and a data interface, the PWM modulation module comprises a PWM chip, the first input terminal and the second input terminal are located on the PWM chip, the PWM chip is provided with a clock terminal and a programmable terminal, the clock interface is electrically connected to the clock terminal, and the data interface is electrically connected to the programmable terminal; the PWM chip can be burned through the clock interface and the data interface, so that the PWM modulation module modulates other PWM signals to adjust the brightness or color temperature of the LED lamp, and the LED lamp is simple in structure and convenient to operate.

According to the utility model discloses a some embodiments, the PWM modulation module includes the signal unit of pulling up, the one end of signal unit of pulling up is connected with the PWM chip electricity, the other end and the external power source electricity of signal unit of pulling up are connected, and the pin of avoiding the PWM chip is unsettled, and the reinforcing interference killing feature ensures that the working property of PWM modulation module is stable.

According to some embodiments of the present invention, the signal pull-up unit includes a resistor R1 and a resistor R2, one end of the resistor R1 is electrically connected to the clock terminal, one end of the resistor R2 is electrically connected to the programmable terminal, and the other end of the resistor R1 and the other end of the resistor R2 are electrically connected to an external power source, respectively; the resistor R1 and the resistor R2 are pull-up resistors, so that the clock end and the programmable end are kept at high level when no signal is input, the anti-interference capability is enhanced, the working performance of the PWM modulation module is stable, the circuit structure is simple, and the realization is convenient.

According to the utility model discloses a some embodiments, PWM modulation module includes signal drop-down unit, signal drop-down unit's one end respectively with first input with the second input electricity is connected, signal drop-down unit's other end ground connection, when starting, ensures first input and second input ground connection, makes PWM modulation module reset, the signal zero clearing.

According to some embodiments of the utility model, the signal drop unit includes resistance R4 and resistance R5, resistance R4 one end with first input electricity is connected, resistance R5 one end with the second input is connected, and resistance R4's the other end and resistance R5's the other end ground connection respectively, and resistance R4 and resistance R5 are drop resistance, and during the start-up, ensure first input and second input ground connection, make PWM modulation module reset, the signal zero clearing, circuit structure is simple, the realization of being convenient for.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a block diagram of a tri-state LED lamp control circuit according to an embodiment of the present invention;

fig. 2 is a circuit diagram of a tri-state LED lamp control circuit according to an embodiment of the present invention.

Reference numerals:

main control module 100, PWM modulation module 200, isolation module 300, first

Isolation circuit 310, second isolation circuit 320, voltage regulation module 400, online programming

And (5) a module 500.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If any description to first, second and third is only for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

As shown in fig. 1 to fig. 2, the tri-state LED lamp control circuit according to the embodiment of the present invention includes a main control module 100, a PWM modulation module 200 and an isolation module 300, wherein the main control module 100 includes a first output end and a second output end capable of outputting high and low levels, as shown in fig. 2, the main control module 100 is a chip U1, the LDRV end of the chip U1 is the first output end, and the MDRV end of the chip U1 is the second output end; the PWM modulation module 200 includes a first input terminal and a second input terminal, as shown in fig. 2, the PWM modulation module 200 includes a PWM chip U2, the RA4 terminal of the PWM chip U2 is the first input terminal, and the RA5 terminal of the PWM chip U2 is the second input terminal; the first output end is connected with the first input end through the isolation module 300, and the second output end is connected with the second input end through the isolation module 300; the PWM modulation module 200 is capable of forming a plurality of PWM driving signals according to the modulation of the signals obtained from the first input terminal and the second input terminal. The first output end and the second output end can be combined to output a plurality of groups of control signals, the control signals can be accurately input into the PWM modulation module 200 through the isolation module 300, and the PWM modulation module modulates a plurality of corresponding PWM driving signals according to the plurality of groups of control signals to drive the light source; for example, when the first output terminal is at a high level and the second output terminal is at a low level, the PWM modulation module 200 modulates a first PWM signal for driving the light source to operate at a low brightness; when the first output end is at a low level and the second output end is at a high level, the PWM modulation module 200 modulates a second PWM signal for driving the light source to operate in a high brightness mode; when the first output end is at a low level and the second output end is at a low level, the PWM modulation module 200 modulates a third PWM signal for turning off the light source; therefore, the low-brightness, high-brightness and off states of the light source are regularly switched without being interfered by other signals.

In some embodiments, the isolation module 300 includes a first isolation circuit 310 and a second isolation circuit 320, an input terminal of the first isolation circuit 310 is electrically connected to a first output terminal, and an output terminal of the first isolation circuit 310 is electrically connected to the first input terminal, so that a signal at the first output terminal is accurately input to the first input module through the first isolation circuit 310; the input end of the second isolation circuit 320 is electrically connected to the second output end, and the output end of the second isolation circuit 320 is electrically connected to the second input end, so that the signal of the second output end is accurately input to the second input end through the second isolation circuit 320.

In some embodiments, the first isolation circuit 310 includes a first optical coupler U3, a resistor R6, and a resistor R7, the first optical coupler U3 includes a first light emitter and a first light receiver, one end of the resistor R6 and one end of the resistor R7 are respectively electrically connected to a first output terminal, the other end of the resistor R6 is electrically connected to an input terminal of the first light emitter, the other end of the resistor R7 and an output terminal of the first light emitter are respectively grounded, an output terminal of the first light receiver is electrically connected to the first input terminal, and an input terminal of the first light receiver is connected to an external power supply; first optical coupler U3 has good isolation to the input, output signal of telecommunication, makes the transmission of signal of telecommunication have the unidirectionality between first output and the first input, has good electrical insulation and anti-interference function, and circuit structure is simple, is convenient for realize.

In some embodiments, the second isolation circuit 320 includes a second optical coupler U4, a resistor R8, and a resistor R9, the second optical coupler U4 includes a second light emitter and a second light receiver, one end of the resistor R8 and one end of the resistor R9 are respectively electrically connected to the second output terminal, the other end of the resistor R8 is electrically connected to the input terminal of the second light emitter, the other end of the resistor R9 and the output terminal of the second light emitter are respectively grounded, the output terminal of the second light receiver is electrically connected to the second input terminal, and the input terminal of the second light receiver is connected to an external power supply; the second optical coupler U4 has good isolation effect on input and output electric signals, so that the transmission of the electric signals between the second output end and the second input end has unidirectionality, and the circuit has good electric insulation and anti-interference functions, is simple in structure and is convenient to realize.

In some embodiments, the PWM driving circuit further includes a voltage stabilizing module 400, an input end of the voltage stabilizing module 400 is electrically connected to an external power supply, an output end of the voltage stabilizing module 400 is electrically connected to a voltage end of the PWM modulation module 200 and a voltage end of the isolation module, as shown in fig. 2, the voltage stabilizing module 400 includes a voltage regulator Vr, a Vin end of the voltage regulator Vr is electrically connected to a 12V voltage end of the chip U1, a Vout end of the voltage regulator Vr is electrically connected to a VCC end of the PWM chip U2, a VCC end of the first optical coupler U3 and a VCC end of the second optical coupler U4, so as to ensure stable transmission of signals.

In some embodiments, the online programming module 500 is further included, as shown in fig. 2, the online programming module 500 is a chip U5, the chip U5 includes a clock interface PGC, a data interface PCD and a reset interface MCLR, the PWM modulation module 200 includes a PWM chip U2 and a resistor R3, the PWM chip may employ a single chip microcomputer of model 12F1822, the PWM chip U2 includes a clock terminal RA0, a programmable terminal RA1 and a reset terminal RA3, one end of the resistor R3 is electrically connected to the reset terminal RA3, the other end of the resistor R3 is electrically connected to a Vout terminal of the voltage regulator Vr to form a pull-up resistor to keep the reset terminal RA3 at a high level, the clock interface PGC is electrically connected to the clock terminal RA0, the data interface PCD is electrically connected to the programmable terminal RA1, the reset interface MCLR is electrically connected to the reset terminal RA3 to enable the PWM chip U2 to be reset, the PWM chip U2 may be programmed through the clock interface and the data interface and enable the PWM modulation module 200 to modulate, the LED lamp is used for adjusting the brightness or color temperature of the LED lamp, and is simple in structure and convenient to operate.

In some embodiments, the PWM modulation module 200 includes a signal pull-up unit, one end of the signal pull-up unit is electrically connected to the clock terminal and the programmable terminal, respectively, and the other end of the signal pull-up unit is electrically connected to the external power supply, so as to enhance the anti-interference capability and ensure the stable working performance of the PWM modulation module.

In some embodiments, the signal pull-up unit includes a resistor R1 and a resistor R2, one end of the resistor R1 is electrically connected to the clock terminal RA0, one end of the resistor R2 is electrically connected to the programmable terminal RA1, the other end of the resistor R1 and the other end of the resistor R2 are electrically connected to the Vout terminal of the external power supply or the voltage regulator Vr, respectively, the resistor R1 and the resistor R2 are pull-up resistors, and when no signal is input, the third input terminal RA0 and the fourth input terminal RA1 are kept at high level, so that the anti-interference capability is enhanced, the stable operation performance of the PWM modulation module 200 is ensured, and the circuit structure is simple and convenient to implement.

In some embodiments, the PWM modulation module 200 includes a signal pull-down unit, one end of the signal pull-down unit is electrically connected to the first input terminal and the second input terminal, respectively, and the other end of the signal pull-down unit is grounded, so that the first input terminal and the second input terminal are grounded when the computer is turned on, the PWM modulation module is reset, and the signal is cleared.

In some embodiments, the signal pull-down unit includes a resistor R4 and a resistor R5, one end of the resistor R4 is electrically connected to the first input terminal RA4, one end of the resistor R5 is electrically connected to the second input terminal RA5, the other end of the resistor R4 and the other end of the resistor R5 are respectively grounded, the resistor R4 and the resistor R5 are pull-down resistors, and when the power-on device is turned on, the first input terminal and the second input terminal are grounded, so that the PWM chip 200 is reset, the signal is cleared, and the circuit structure is simple and convenient to implement.

Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims

1. A tristate LED lamp control circuit, comprising:

the main control module (100) comprises a first output end and a second output end which can output high and low levels;

a PWM modulation module (200) comprising a first input and a second input;

an isolation module (300), the first output being connected to the first input via the isolation module (300), the second output being connected to the second input via the isolation module (300); the PWM modulation module (200) can modulate and form a plurality of PWM driving signals according to the signals obtained by the first input end and the second input end.

2. The tri-state LED lamp control circuit of claim 1, wherein: the isolation module comprises a first isolation circuit (310) and a second isolation circuit (320), wherein an input end of the first isolation circuit (310) is electrically connected with the first output end, and an output end of the first isolation circuit (310) is electrically connected with the first input end; the input end of the second isolation circuit (320) is electrically connected with the second output end, and the output end of the second isolation circuit (320) is electrically connected with the second input end.

3. The tri-state LED lamp control circuit of claim 2, wherein: first isolation circuit (310) includes first opto-coupler, resistance R6 and resistance R7, first opto-coupler includes first illuminator and first photic ware, resistance R6's one end and resistance R7's one end respectively with first output electricity is connected, resistance R6's the other end with the input electricity of first illuminator is connected, resistance R7's the other end with the output of first illuminator is ground connection respectively, the output of first photic ware with first input electricity is connected, the input of first photic ware is connected with external power source.

4. The tri-state LED lamp control circuit of claim 2, wherein: the second isolation circuit (320) comprises a second optical coupler, a resistor R8 and a resistor R9, the second optical coupler comprises a second light emitter and a second light receiver, one end of the resistor R8 and one end of the resistor R9 are respectively connected with the second output end electrically, the other end of the resistor R8 is electrically connected with the input end of the second light emitter, the other end of the resistor R9 is grounded with the output end of the second light emitter respectively, the output end of the second light receiver is electrically connected with the second input end, and the input end of the second light receiver is connected with an external power supply.

5. The tri-state LED lamp control circuit of claim 1, wherein: the PWM power supply further comprises a voltage stabilizing module (400), wherein the input end of the voltage stabilizing module (400) is electrically connected with an external power supply, and the output end of the voltage stabilizing module (400) is electrically connected with the PWM modulation module (200) and the isolation module (300) respectively.

6. The tri-state LED lamp control circuit of claim 1, wherein: still include online programming module (500), online programming module (500) includes clock interface and data interface, PWM modulation module (200) includes the PWM chip, first input with the second input is located on the PWM chip, be equipped with clock end and programmable end on the PWM chip, the clock interface with clock end electric connection, the data interface with programmable end electric connection.

7. The tri-state LED lamp control circuit of claim 6, wherein: the PWM modulation module (200) comprises a signal pull-up unit, one end of the signal pull-up unit is electrically connected with the PWM chip, and the other end of the signal pull-up unit is electrically connected with an external power supply.

8. The tri-state LED lamp control circuit of claim 7, wherein: the signal pull-up unit comprises a resistor R1 and a resistor R2, one end of the resistor R1 is electrically connected with the clock end, one end of the resistor R2 is electrically connected with the programmable end, and the other end of the resistor R1 and the other end of the resistor R2 are respectively electrically connected with an external power supply.

9. The tri-state LED lamp control circuit of claim 1, wherein: the PWM modulation module (200) comprises a signal pull-down unit, one end of the signal pull-down unit is electrically connected with the first input end and the second input end respectively, and the other end of the signal pull-down unit is grounded.

10. The tri-state LED lamp control circuit of claim 9, wherein: the signal pull-down unit comprises a resistor R4 and a resistor R5, one end of the resistor R4 is electrically connected with the first input end, one end of the resistor R5 is electrically connected with the second input end, and the other end of the resistor R4 and the other end of the resistor R5 are respectively grounded.