CN214960196U

CN214960196U - LED control circuit

Info

Publication number: CN214960196U
Application number: CN202120544702.1U
Authority: CN
Inventors: 黄森锋; 吴声勇; 黄恩民; 黄伟明; 陈浩峻; 吴治萱
Original assignee: Zhuhai Real Design Electronic Technology Co ltd
Current assignee: Zhuhai Real Design Electronic Technology Co ltd
Priority date: 2021-03-16
Filing date: 2021-03-16
Publication date: 2021-11-30
Anticipated expiration: 2031-03-16

Abstract

The utility model discloses a LED control circuit, including LED unit, partial pressure switch unit, button module and rectification filter module. The first end of the voltage division unit is connected with the output end of the LED unit, and the voltage division end of the voltage division unit is grounded; the first end of the voltage division switch unit is connected with the second end of the voltage division unit; the output end of the key module is connected with the second end of the voltage division switch unit; and the power supply end of the rectification filtering module is respectively connected with the input end of the LED unit and the power supply end of the key module. The utility model discloses a LED control circuit realizes the switching of two kinds of luminance to the LED unit through button module, partial pressure switch unit and partial pressure unit, can reduce the occupation to IO port resource to reduce the cost.

Description

LED control circuit

Technical Field

The utility model relates to a LED control technology field, in particular to LED control circuit.

Background

The LED lamp has lower energy consumption, generally has a low working voltage of 2V to 4V, has better safety, and is generally used as an indicator lamp. The LED lamp has various colors or various brightnesses according to the voltage. At present, the voltage is usually changed by outputting PWM through a singlechip, so that the brightness of an LED lamp is changed. However, when the LED lamp is only required to switch between two brightness levels, the way of changing the brightness of the LED lamp through PWM is complicated, and occupies more I/O port resources, which is costly.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a LED control circuit can reduce the occupation to the IO port, reduce cost.

According to the utility model discloses LED control circuit, include: an LED unit; the first end of the voltage division unit is connected with the output end of the LED unit, and the voltage division end of the voltage division unit is grounded; the first end of the voltage division switch unit is connected with the second end of the voltage division unit; the output end of the key module is connected with the second end of the voltage division switch unit; and the power supply end of the rectification filtering module is respectively connected with the input end of the LED unit and the power supply end of the key module.

According to the utility model discloses LED control circuit has following beneficial effect at least: the rectification filter module is used for outputting stable low-voltage direct current, namely the rectification filter module is used for serving as a low-voltage direct current power supply so as to prevent surge voltage from damaging components in the circuit, and therefore the circuit is more durable, replacement frequency of the components is reduced, and cost is reduced. Under the power supply of the rectification filter module, the key module controls the on-off of the voltage division switch unit, so that the voltage division unit realizes different voltage division effects, the current flowing through the LED unit is changed, the purpose of switching the luminous brightness of the LED unit is realized, the switching of the luminous brightness of the LED unit through PWM control by the controller is avoided, I/O port resources are avoided being occupied, or the LED control circuit is enabled not to adopt the controller, and the purpose of reducing cost is realized.

According to the utility model discloses a some embodiments, the partial pressure unit includes first partial pressure resistance and second partial pressure resistance, the first end of first partial pressure resistance with the first end of second partial pressure resistance respectively with the output of LED unit is connected, the second end ground connection of first partial pressure resistance, the second end of second partial pressure resistance with the first end of partial pressure switch unit is connected to in order to adjust the electric current of flowing through the LED unit, thereby realize the switching of the luminous luminance of LED unit.

According to some embodiments of the present invention, the resistance of the first divider resistor is greater than the resistance of the second divider resistor, so that the switching of the luminance of the light emitting unit is more obvious.

According to the utility model discloses a some embodiments, the button module includes touch button and touch control unit, the touch button with touch control unit's input is connected, touch control unit's output with the second end of partial pressure switch unit is connected, touch control unit's power end with the supply end of rectification filtering module is connected to the size of the electric current of LED unit of flowing through is controlled to the break-make through control partial pressure switch unit.

According to some embodiments of the utility model, the button module still includes first filtering unit, second filtering unit, current-limiting unit and protection unit, first filtering unit with touch control unit's input is connected, the first end of current-limiting unit with touch control unit's output is connected, the second filtering unit with current-limiting unit's first end or current-limiting unit's second end is connected, the protection unit with touch control unit's power end is connected to be favorable to the protection touch control unit to in the LED control circuit inserts the control circuit who has the controller, make the button module can give controller input information, and make the LED unit act as the pilot lamp better.

According to the utility model discloses a some embodiments, the button module includes current-limiting resistor and switch, current-limiting resistor's first end with rectifier and filter module's feed end is connected, current-limiting resistor's second end connect respectively in the first end of switch with the second end of bleeder switch unit, the second end ground connection of switch to the size of the electric current of LED unit of flowing through is controlled through the break-make of control bleeder switch unit, and button module circuit structure is simpler, is favorable to reduce cost.

According to the utility model discloses a some embodiments, rectification filter module includes alternating current input interface, rectifier cell, filter capacitor and piezo-resistor, alternating current input interface's first end connect respectively in rectifier cell's first input end with piezo-resistor's first end, alternating current input interface's second end connect respectively in rectifier cell's second input end with piezo-resistor's second end, rectifier cell's first output connect respectively in filter capacitor's first end the input of LED unit with the power end of key module, rectifier cell's second output with filter capacitor's second end ground connection to components and parts in the protection circuit, and for LED unit and key module power supply.

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 partial circuit diagram of an LED control circuit according to an embodiment of the present invention;

fig. 2 is a circuit diagram of a key module of an LED control circuit according to an embodiment of the present invention;

fig. 3 is a circuit diagram of a key module of an LED control circuit according to some embodiments of the present invention.

The reference numbers are as follows:

the LED touch screen comprises an LED unit 100, a voltage division unit 200, a first voltage division resistor 210, a second voltage division resistor 220, a key module 400, a touch key 410, a touch control unit 420, a first filtering unit 430, a second filtering unit 440, a current limiting unit 450, a protection unit 460, a current limiting resistor 470, a switch 480, a rectifying and filtering module 500, an alternating current input interface 510 and a filtering capacitor 520.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and 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 present number, and the terms greater than, less than, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are 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.

Referring to fig. 1 and 2, an LED control circuit includes an LED unit 100, a voltage division unit 200, a voltage division switch unit 300, a key module 400, and a rectification filter module 500. The first end of the voltage dividing unit 200 is connected with the output end of the LED unit 100, and the voltage dividing end of the voltage dividing unit 200 is grounded; a first terminal of the voltage dividing switch unit 300 is connected to a second terminal of the voltage dividing unit 200; the output end of the key module 400 is connected with the second end of the voltage dividing switch unit 300; the power supply terminals of the rectifying and filtering module 500 are respectively connected to the input terminal of the LED unit 100 and the power supply terminal of the key module 400.

Wherein, the rectifier filter module 500 is used for exporting stable low voltage direct current, and rectifier filter module 500 is used for acting as low voltage direct current power supply promptly to prevent surge voltage and destroy the components and parts in the circuit, thereby make the durability of circuit better, reduce the change frequency of components and parts, with reduce cost. Under the power supply of the rectification filter module 500, the key module 400 controls the on-off of the voltage division switch unit 300, so that the voltage division unit 200 realizes different voltage division effects, further the current flowing through the LED unit 100 is changed, the purpose of switching the brightness of the LED unit 100 is realized, further the switching of the brightness of the LED unit 100 through PWM control by the controller is avoided, the occupation of I/O port resources is avoided, or the LED control circuit does not need to adopt a controller, and the purpose of reducing the cost is realized. That is, when a circuit having a controller is provided, the LED control circuit is applied to switch the light emitting brightness of the LED unit 100, so that the LED unit 100 serves as an indicator and provides an optical feedback signal, the LED control circuit does not need to occupy the I/O port resource of the controller, thereby achieving the purpose of reducing the cost.

The voltage dividing switch unit 300 may adopt a switching tube such as a diode or a triode, and in this embodiment, a diode is adopted. The circuit with the switching function is realized through the diode, the structure of the circuit is simpler, and the cost is reduced.

Referring to fig. 1, the voltage dividing unit 200 includes a first voltage dividing resistor 210 and a second voltage dividing resistor 220, a first terminal of the first voltage dividing resistor 210 and a first terminal of the second voltage dividing resistor 220 are respectively connected to the output terminals of the LED unit 100, a second terminal of the first voltage dividing resistor 210 is grounded, and a second terminal of the second voltage dividing resistor 220 is connected to a first terminal of the voltage dividing switch unit 300.

The key module 400 controls the on/off of the voltage dividing switch unit 300, so that the voltage dividing unit 200 realizes different voltage dividing effects, the magnitude of the current flowing through the LED unit 100 is changed, and the switching between the low and high brightness of the LED unit 100 is realized. When the resistance of the first voltage-dividing resistor 210 is greater than the resistance of the second voltage-dividing resistor 220, the switching of the light-emitting brightness of the LED unit 100 can be more obvious, so as to distinguish the change of the light-emitting brightness. For example, the first divider resistor 210 has a resistance of 100 kilo-ohms, and the second divider resistor 220 has a resistance of 4.7 kilo-ohms; alternatively, the first voltage dividing resistor 210 has a resistance of 200 k Ω, and the second voltage dividing resistor 220 has a resistance of 5 k Ω.

When the voltage dividing switch unit 300 is turned off, the second voltage dividing resistor 220 does not participate in voltage division, only the first voltage dividing resistor 210 divides the voltage, and under the condition that the resistance value of the first voltage dividing resistor 210 is large, the current flowing through the LED unit 100 is small, so that the light emitting brightness of the LED unit 100 is low; when the voltage dividing switch unit 300 is turned on, the second voltage dividing resistor 220 participates in voltage division, and since the second voltage dividing resistor 220 is equivalently connected in parallel to the first voltage dividing resistor 210, the resistance value of the resistor group formed by the first voltage dividing resistor 210 and the second voltage dividing resistor 220 is smaller than that of the first voltage dividing resistor 210, so that the current flowing through the LED unit 100 is increased, and the light emitting brightness of the LED unit is higher.

In addition, the first terminal of the first voltage-dividing resistor 210 and the first terminal of the second voltage-dividing resistor 220 are commonly used as the first terminal of the voltage-dividing unit 200, the second terminal of the first voltage-dividing resistor 210 is used as the voltage-dividing terminal of the voltage-dividing unit 200, and the second terminal of the second voltage-dividing resistor 220 is used as the second terminal of the voltage-dividing unit 200.

In fig. 1, the LED1, the LED2, the LED3, the LED4, and the LED5 are the LED unit 100, the resistor R51, the resistor R52, the resistor R53, the resistor R54, and the resistor R55 are the first voltage-dividing resistors 210, the diode D2, the diode D3, the diode D4, the diode D5, and the diode D6 are the voltage-dividing switch unit 300, and the resistor R56, the resistor R57, the resistor R58, the resistor R59, and the resistor R60 are the second voltage-dividing resistors 220. Taking the light emitting branch composed of the LED1, the resistor R51, the resistor R56, and the diode D2 as an example, if the level state of the cathode of the diode D2 is set to high level by the key module 400, the current flowing through the LED1 is small, and the current hardly flows to the resistor R56, but flows to the ground terminal through the resistor R51, so that the brightness of the LED1 is low; the key module 400 sets the level state of the anode of the diode D2 to be low level, and the resistor R56 is equivalent to be connected in parallel to the resistor R51, so that in the light emitting branch, the impedance is reduced, the current flowing through the LED1 is increased, and the brightness of the LED1 is high.

Referring to fig. 1, the rectifying and filtering module 500 includes an ac input interface 510, a rectifying unit (not shown), a filtering capacitor 520 and a voltage dependent resistor (not shown), wherein a first end of the ac input interface 510 is connected to a first input end of the rectifying unit and a first end of the voltage dependent resistor, a second end of the ac input interface 510 is connected to a second input end of the rectifying unit and a second end of the voltage dependent resistor, a first output end of the rectifying unit is connected to a first end of the filtering capacitor 520, an input end of the LED unit 100 and a power end of the key module 400, and a second output end of the rectifying unit and a second end of the filtering capacitor 520 are grounded.

The rectifying unit is configured to rectify ac power input through the ac power input interface 510 into dc power. When a surge voltage appears, the piezoresistor can protect components in the circuit, such as the rectifying unit, the filter capacitor 520, the LED unit 100 and the like, for example, when the voltage rises abnormally, the piezoresistor can be fused, so that the rectifying unit is prevented from being burnt by the excessive voltage. The filter capacitor 520 includes a capacitor C2 and a capacitor C3, and is configured to filter noise interference in the direct current output by the rectifier unit, so that the rectifier filter module 500 outputs a stable low-voltage direct current to the LED unit 100 and the key module 400, and the key module 400 can switch two luminances of the LED unit 100 without a controller sending a PWM wave through an I/O port to control the switching of the luminance of the LED unit 100, thereby reducing the occupation of the I/O port resources by the LED unit 100, and reducing the cost.

In addition, the first output terminal of the rectifying unit serves as a power supply terminal of the rectifying and filtering module 500.

Referring to fig. 2, the key module 400 includes a touch key 410 and a touch control unit 420, the touch key 410 is connected to an input terminal of the touch control unit 420, an output terminal of the touch control unit 420 is connected to a second terminal of the voltage division switching unit 300, and a power supply terminal of the touch control unit 420 is connected to a power supply terminal of the rectification filter module 500. The touch key 410 is used for inputting a signal to the touch control unit 420, so that the touch control unit 420 controls the on/off of the voltage division switch unit 300 to switch the brightness of the LED unit 100, and therefore a single chip microcomputer is not needed to control the switching of the brightness of the LED unit 100 through PWM, and the purpose of reducing occupation of I/O port resources is achieved.

For example, in fig. 2, T1, T2, T3, T4, and T5 indicate the touch keys 410, that is, the number of the touch keys 410 is 5, the output terminal of the touch control unit 420 includes a key1 pin, a key2 pin, a key3 pin, a key4 pin, and a key5 pin, that is, the output terminal of the touch control unit 420 includes 5 output pins; referring to fig. 1 and 2, when T1 is touched, the level state of the key1 pin is changed from high level to low level, so that the diode D2 is turned on, the current flowing through the LED1 becomes large, and the brightness of the LED1 is switched from low to high.

Referring to fig. 2, the key module 400 further includes a first filtering unit 430, a second filtering unit 440, a current limiting unit 450, and a protection unit 460, wherein the first filtering unit 430 is connected to an input terminal of the touch control unit 420, a first end of the current limiting unit 450 is connected to an output terminal of the touch control unit 420, the second filtering unit 440 is connected to a first end of the current limiting unit 450 or a second end of the current limiting unit 450, and the protection unit 460 is connected to a power terminal of the touch control unit 420.

The touch button 410 may generate noise when turned on, and the noise may affect the normal operation of the touch control unit 420, and the first filtering unit 430 is used to reduce the noise. According to actual requirements, the key module 400 may be connected to a controller such as a single chip, that is, the output end of the touch control unit 420 is connected to the input end of the controller, and the LED unit 100 may be used to prompt that a key is pressed or triggered. Moreover, the output end of the touch control unit 420 is connected with the input end of the controller, which is equivalent to changing the input circuit and the light-emitting brightness switching circuit of the controller into the LED control circuit, and the input circuit and the light-emitting brightness switching circuit respectively occupy two groups of I/O ports, however, after the LED control circuit is used to replace the input circuit and the light-emitting brightness switching circuit, only one group of I/O ports is occupied, and the use of I/O port resources is reduced.

Based on this, a current limiting unit 450 and a second filtering unit 440 are provided, the current limiting unit 450 is used for limiting the magnitude of the output current of the touch control unit 420, and the second filtering unit 440 is used for reducing noise in the output current of the touch control unit 420 and avoiding abnormal operation of the controller caused by the noise or large current. The protection unit 460 is used to prevent the touch control unit 420 from being damaged due to excessive voltage variation. For example, when the voltage input by the power terminal of the touch control unit 420 varies too much, the transient suppression diode and the capacitor in the protection unit 460 may release the energy in the voltage, so that the voltage input by the power terminal of the touch control unit 420 is kept in a stable range, which is beneficial to the normal operation of the touch control unit 420.

In fig. 2, the first filter unit 430 includes a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, and a capacitor C14, so as to filter noise generated from each touch key 410. The second filtering unit 440 includes a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C18, and a capacitor C19, so as to filter noise output from 5 output pins among the output terminals of the touch control unit 420. The current limiting unit 450 includes a resistor R10, a resistor R11, a resistor R12, a resistor R13, and a resistor R14, and is configured to limit the current output from 5 output pins of the output terminal of the touch control unit 420. The protection unit 460 includes a transient suppression diode and a capacitor C20, a first terminal of the transient suppression diode and a first terminal of the capacitor C20 are respectively connected to the power source terminals of the touch control unit 420, and a second terminal of the transient suppression diode and a second terminal of the capacitor C20 are both grounded for protecting the touch control unit 420.

Referring to fig. 3, in other embodiments of the present invention, the key module 400 includes a current limiting resistor 470 and a switch 480, a first end of the current limiting resistor 470 is connected to a power supply terminal of the rectifying and filtering module 500, a second end of the current limiting resistor 470 is connected to a first end of the switch 480 and a second end of the voltage dividing switch unit 300, and a second end of the switch 480 is grounded. Since the first end of the current-limiting resistor 470 is connected to the power supply end of the rectifying and filtering module 500, that is, the first end of the current-limiting resistor 470 is connected to the power supply end, when the switch 480 is turned off, the level state of the second end of the current-limiting resistor 470 is a high level, so that the voltage-dividing switch unit 300 is turned off, and the current in the LED unit 100 flows into the ground end through the first voltage-dividing resistor 210 and does not flow through the second voltage-dividing resistor 220, that is, the switch 480 is turned off, so that the luminance of the LED unit 100 is low; when the switch 480 is closed, the level state of the second end of the current-limiting resistor 470 is a low level, so that the voltage-dividing switch unit 300 is turned on, and the current in the LED unit 100 flows to the first voltage-dividing resistor 210 and the second voltage-dividing resistor 220, respectively, but under the action of the second voltage-dividing resistor, the resistance value of the resistor group formed by the first voltage-dividing resistor 210 and the second voltage-dividing resistor 220 is smaller than that of the first voltage-dividing resistor 210, so that the divided voltage of the voltage-dividing unit 200 is reduced, and thus the current flowing through the LED unit 100 is increased, and the light-emitting luminance of the LED unit 100 is further improved, that is, the switch 480 is closed, so that the light-emitting luminance of the LED unit 100 is higher.

In addition, the key module 400 has fewer components, so that the LED unit 100 does not need to occupy I/O port resources of a single chip, and the luminance of the LED unit 100 can be switched between low and high, thereby reducing the cost. In this embodiment, referring to fig. 1 and 3, 5 light emitting branches are provided in the LED unit 100, then the key module 400 is provided with 5

switches

480 and 5 current limiting resistors 470, where the 5 switches 480 are SW1, SW2, SW3, SW4 and SW5, and the 5 current limiting resistors 470 are resistors R20, R21, R22, R23 and R24, respectively, for controlling the switching of the light emitting brightness of each light emitting branch, that is, the number of the switches 480 and the number of the current limiting resistors 470 of the key module 400 can be adjusted according to the number of the light emitting branches.

The switch 480 may be a dial switch, a push button, or the like.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. An LED control circuit, comprising:

an LED unit;

the first end of the voltage division unit is connected with the output end of the LED unit, and the voltage division end of the voltage division unit is grounded;

the first end of the voltage division switch unit is connected with the second end of the voltage division unit;

the output end of the key module is connected with the second end of the voltage division switch unit;

and the power supply end of the rectification filtering module is respectively connected with the input end of the LED unit and the power supply end of the key module.

2. The LED control circuit of claim 1, wherein the voltage dividing unit comprises a first voltage dividing resistor and a second voltage dividing resistor, a first terminal of the first voltage dividing resistor and a first terminal of the second voltage dividing resistor are respectively connected to the output terminals of the LED unit, a second terminal of the first voltage dividing resistor is connected to ground, and a second terminal of the second voltage dividing resistor is connected to the first terminal of the voltage dividing switch unit.

3. The LED control circuit of claim 2, wherein the first voltage divider resistor has a resistance value greater than a resistance value of the second voltage divider resistor.

4. The LED control circuit according to claim 1, wherein the key module comprises a touch key and a touch control unit, the touch key is connected to an input end of the touch control unit, an output end of the touch control unit is connected to the second end of the voltage dividing switch unit, and a power supply end of the touch control unit is connected to a power supply end of the rectifying and filtering module.

5. The LED control circuit of claim 4, wherein the key module further comprises a first filtering unit, a second filtering unit, a current limiting unit and a protection unit, the first filtering unit is connected to an input terminal of the touch control unit, a first end of the current limiting unit is connected to an output terminal of the touch control unit, the second filtering unit is connected to a first end of the current limiting unit or a second end of the current limiting unit, and the protection unit is connected to a power supply terminal of the touch control unit.

6. The LED control circuit of claim 1, wherein the key module comprises a current-limiting resistor and a switch, a first end of the current-limiting resistor is connected to the power supply end of the rectifying and filtering module, a second end of the current-limiting resistor is connected to the first end of the switch and the second end of the voltage-dividing switch unit, and the second end of the switch is grounded.

7. The LED control circuit according to any one of claims 1 to 6, wherein the rectifying and filtering module comprises an AC input interface, a rectifying unit, a filtering capacitor and a voltage dependent resistor, a first end of the AC input interface is connected to a first input end of the rectifying unit and a first end of the voltage dependent resistor respectively, a second end of the AC input interface is connected to a second input end of the rectifying unit and a second end of the voltage dependent resistor respectively, a first output end of the rectifying unit is connected to a first end of the filtering capacitor, an input end of the LED unit and a power supply end of the key module respectively, and a second output end of the rectifying unit and a second end of the filtering capacitor are grounded.