TWI393482B - Led control device - Google Patents

Description

LED control unit

The present invention relates to an LED control device, and more particularly to an LED control device capable of controlling an LED blinking manner according to user preferences.

In recent years, LED light strings have been widely used in lighting, kanban and the like. In order to make the lighting and kanban attract people's attention, the light string has a colorful and colorful lighting effect, the flashing frequency of the LED string changes, and the brightness and darkness changes must meet the actual needs.

At present, many LED devices with simple design have a certain flickering mode. However, the flicker variation mode of such LED control devices is too monotonous to achieve the desired effect of the user. Although some LED control devices have achieved the above effects, they are usually obtained at the cost of designing large and complex circuits and using more chips, and even need to write a more complicated control program, which will inevitably result in resources. Waste, increase production costs.

In addition, current LED control devices cannot change the way their flicker changes according to the user's personal preferences. Although some LED control devices can modify the flashing mode of the LED light by modifying the control program in the memory of the LED device, this modification is not completed by everyone, especially for non-professional ordinary users. And the use of memory by such LED control devices also causes an increase in cost.

Based on the above problems, it is necessary to invent an LED control device that is simple in circuit, does not require a memory, and can freely change the LED blinking mode according to user preferences.

In view of the above, an object of the present invention is to provide an LED control device capable of controlling the blinking manner of an LED according to user preferences.

The LED control device comprises: a power plug, at least one LED socket and an LED unit connected to the LED socket; the power plug is used for connecting a power source to obtain electric energy required by the LED control device. The LED socket has a recess therein. The LED control device further includes an LED control unit, the LED control unit is disposed in the recess of the LED socket and controls the LED unit; the control unit further includes: a control circuit, an input end and a At the output end, the control circuit is connected to the LED socket via the input end and the output end, and controls a change in the flicker frequency of the LED unit, and the brightness changes.

With the LED control device of the present invention, the user can change the blinking manner of the LED unit by simply placing the LED control unit into a different LED socket recess.

1 is a block diagram of an LED control device of the present invention. The LED control device includes a power plug 1, an LED socket 2, an LED unit 3, and at least one control unit 4. The number of LEDs of the LED unit 3 is the same as the number of sockets of the LED socket 2, and is electrically connected, respectively. The LED socket 2 is electrically connected to the power plug 1 for obtaining the amount of power required to illuminate the LED of the LED unit 3. The control unit 4 is placed in a socket of the LED socket 2 and connected in parallel with one of the LEDs of the LED unit 3 in the socket to control one of the LED units 3 The blinking frequency and brightness of LEDs vary. Wherein, when the socket in which the control unit 4 is placed is not connected to an LED, the control unit 4 is connected in series with all LEDs of the LED unit 3, and the control unit 4 controls all LEDs of the LED unit 3 The flicker frequency and brightness change.

2 is a schematic structural view of an LED control device of the present invention. As shown in the figure, in the present embodiment, the LED sockets 2 are exemplified by J1, J2, J3, J4, ... Jn, and the LED sockets 2 are connected by a power supply line 5 therebetween. Accordingly, the LED unit 3 is exemplified by a plurality of LEDs: D1, D2, D3, D4, ... Dn. The LEDs D1, D2, D3, D4, ... Dn are respectively inserted into the sockets J1, J2, J3, J4, ..., Jn, and are electrically connected to the power plug 1 through the power cord 5. The control unit 4 is placed in the LED socket 2 and electrically connected to the LED socket 2 for controlling the blinking frequency and brightness change of at least one LED of the LED unit 3. For example, when the control unit 4 and the LED are simultaneously placed in the socket J1, the control unit 4 is connected in parallel with the LED on the socket J1 and controls the blinking frequency and brightness change of the LED, without affecting the LED socket. The working state of the LEDs on the other sockets of the second; wherein, when the LEDs on the LED socket J1 are taken out, the control unit 4 is connected in series with the LEDs on all the sockets other than the socket J1, and controls the plurality of LEDs The frequency of flicker and the change in brightness. The control principle of placing the control unit 4 into the other sockets of the LED socket 2 is the same as that of the socket J1.

3 is an exploded view of an LED socket of the LED control device of the present invention. 4 is a diagram showing a connection position relationship between the control unit 4 of the LED control device of the present invention and an LED socket 2 and an LED of the LED unit 3. The LED plug The seat 2 includes a positive electrode 21, a negative electrode 22, metal domes 23 and 24, a recess 25, a housing 26 and a base 27. The positive electrodes 21 are electrically connected to the power line 5 and the metal dome 23, respectively, and the negative electrodes 22 are electrically connected to the power line 5 and the metal dome 24, respectively. The positive electrode 21, the negative electrode 22, and the metal domes 23, 24 are located in the housing 26 of the LED socket 2. The recess 25 is located in the base 27 for insertion into a control unit 4. When the housing 26 is engaged with the base 27, the control unit 4 can be electrically connected to the metal domes 23, 24. As shown in FIG. 4, the LED unit 3 is exemplified as an LED, and includes a positive electrode 31 and a negative electrode 32 respectively connected to the positive electrode 21 and the negative electrode 22 of the LED socket 2 for obtaining the required illumination for the LED. Electricity. The control unit 4 includes a control circuit 40, an input terminal 41 and an output terminal 42. When the control unit 4 is placed in the recess 25 of the LED socket 2 and the housing 26 is engaged with the base 27, the input end 41 and the output end 42 of the control unit 4 pass through the metal. The elastic pieces 23 and 24 are respectively connected to the positive electrode 21 and the negative electrode 22 of the LED socket. The control unit 4 is configured to control a change in the flicker frequency and a change in brightness of the LED.

Fig. 5 is a circuit diagram of a first embodiment of the LED control device of the present invention, the control unit 4 for controlling a plurality of LEDs. As shown in the figure, in the present embodiment, the LED unit 3 exemplifies a total of 16 LEDs, which are sequentially connected in series and connected to the power plug 1. Since the input end 41 and the output end 42 of the control circuit 40 are respectively connected to the metal domes 23 and 24 of the LED socket 2, the metal domes 23 and 24 are respectively connected to the positive electrode 21 and the negative electrode 22 of the LED socket 2. And the LED is not inserted in the socket, because The control unit 4 is connected in series with the 16 LEDs. When the power plug 1 is connected to a power source, the control unit 4 controls the flicker frequency change and the brightness change of the 16 LEDs.

The control circuit 40 includes an oscillating circuit 43 for generating a square wave signal, an RC charging and discharging circuit 44 for generating a triangular wave signal, and a field effect transistor Q1 for periodically conducting according to the control of the triangular wave signal. And the cutoff, thereby controlling the lighting state of the 16 LEDs. The oscillating circuit 43 includes a diode D1, a first resistor R1, a second resistor R2, a second capacitor C01, and a reverse gate U1. The reverse gate U1 includes a power terminal Vcc, a power source Vss, an input terminal and an output terminal. The diode D1, the second resistor R2 and the second capacitor C01 are connected in series to the input end 41 and the output end 42 of the control unit 4. The power terminal Vcc of the reverse gate U1 is connected between the second resistor R2 and the second capacitor C01 to obtain an operating voltage of the reverse gate U1. The power supply terminal Vss of the reverse gate U1 is connected to the output terminal 42 of the control unit 4. The output of the reverse gate U1 is connected to the input end of the RC charging and discharging circuit 44, and is fed back to the input terminal via the first resistor R1. The oscillating circuit 43 further includes a first capacitor C1. The first capacitor C1 is electrically connected between the input end of the reverse gate U1 and the output end 42 of the control unit 4. In different embodiments, the first capacitor C1 is a variable capacitor, and the capacitance of the variable capacitor C1 can be adjusted by an adjustment knob (not shown) exposed to the housing 26 to change the The capacitance value of the input terminal of U1 is reversed, so that the oscillation circuit 43 outputs a square wave signal of different frequency values. The first resistor R1 can also be a variable resistor, and can also pass through an adjustment knob exposed to the housing 26 (Fig. Not shown) to adjust the resistance of the variable resistor R1, the oscillation circuit 43 can also be made to output square wave signals of different frequency values. The RC charge and discharge circuit 44 includes resistors R3, R4 and a capacitor C0. The resistors R3, R4 are connected in series between the output terminal of the reverse gate U1 and the gate of the field effect transistor Q1, one end of the capacitor C0 is connected between the resistors R3, R4, and the other end is connected to the control The output 42 of the unit. The drain and the source of the FET Q1 are respectively connected between the input terminal and the output terminal of the control unit 4.

Fig. 6 is a control timing chart of the LED control device shown in Fig. 5. When the control unit 4 is placed in the recess 25 of the LED 2 socket, the control circuit 40 is connected in series with the 16 LEDs via the input 41 and the output 42 of the control unit 4. The power supply terminal Vcc of the reverse gate U1 obtains an operating voltage between the second resistor R2 and the second capacitor C01 for triggering the oscillation circuit 43 to oscillate and generate a square wave signal S1. The square wave signal S1 is converted into a triangular wave signal S2 via the RC charge and discharge circuit 43 and input to the gate of the field effect transistor Q1. The FET Q1 has a cutoff voltage V _G and a saturation voltage V _max . When the level of the triangular wave S2 is greater than the cutoff voltage V _{G of} the FET Q1, that is, the voltage of the gate When the peak voltage value of the triangular wave S1 of the cutoff voltage V _G and the saturation voltage V _max is changed, the field effect transistor Q1 is turned on; when the level value of the triangular wave S2 is smaller than the cutoff voltage V _{G of} the field effect transistor Q1 The field effect transistor Q1 is turned off. As shown in FIG. 5, since the FET Q1 and the 16 LEDs are connected in series to the power plug 1, when the FET Q1 is turned on, the 16 LEDs are lit; the FET When Q1 is turned off, the 16 LEDs are extinguished.

When the gate voltage of the field effect transistor Q1 is lower than the cutoff voltage V _G of the field effect transistor Q1, the field effect transistor Q1 is turned off, and the 16 LEDs are extinguished. When the gate voltage of the field effect transistor Q1 changes from the off voltage V _G to the saturation voltage V _max , the current flowing from the field effect transistor Q1 to the source becomes larger, and the brightness of the 16 LEDs gradually becomes brighter. . When the gate voltage of the field effect transistor Q1 changes from the saturation voltage V _max to the cutoff voltage V _G , the current flowing from the field effect transistor Q1 to the source becomes smaller, and the brightness of the 16 LEDs gradually changes. dark. The FET Q1 is periodically turned on and off according to the control of the triangular wave signal, so the 16 LEDs periodically flash, the flicker frequency changes with the frequency of the triangular wave, and the brightness of the 16 LEDs changes simultaneously. .

Fig. 7 is a circuit diagram of a second embodiment of the LED control device of the present invention. In contrast to the first embodiment, the control unit 4 controls one of the 16 LEDs. As shown in FIG. 7, in the present embodiment, the control circuit 40 of the control unit 4 is connected in parallel between the positive electrode and the negative electrode of the LED D7 via the input terminal 41 and the output terminal 42. When the power plug 1 is connected to a power source, the oscillation circuit 43 of the control circuit 40 generates a square wave signal S1, which is processed by the RC charge and discharge circuit 44 to generate a triangular wave signal S2, and is input to the field effect transistor Q1. A gate for controlling conduction and deactivation of the field effect transistor Q1. The control unit 4 controls the change of the flicker frequency of the LED D7 and the change of its brightness according to the on and off of the FET Q1.

Please refer to FIG. 8. FIG. 8 is a control timing diagram of the control unit 4 controlling a single LED in the embodiment shown in FIG. As shown in the figure, the oscillation circuit of the control circuit 40 generates a square wave signal S1, and outputs a triangular wave signal S2 via the RC charge and discharge circuit 44. When the level value of the triangular wave signal S2 is smaller than the cutoff voltage V _G of the FET Q1, the FET Q1 is not turned on, and the single LED D7 is in a lighting state, and the brightness of the LED D7 is not A change has occurred. When the level value of the triangular wave S2 is equal to or larger than the cutoff voltage V _G of the field effect transistor Q1, the field effect transistor Q1 is turned on. When the gate voltage of the field effect transistor Q1 rises from the off voltage V _G to the saturation voltage V _max , the current flowing to the source via the drain of the field effect transistor Q1 gradually becomes larger, and then flows through the LED. The current of D7 gradually becomes smaller, and the brightness of the LED D7 gradually becomes darker. When the level value of the triangular wave is equal to or greater than the saturation voltage value V _max of the gate of the FET Q1, the voltage across the LED D7 is the drain and source ends of the FET Q1. The voltage, which is lower than the operating voltage of the LED D7, causes the LED D7 to be extinguished. When the gate voltage of the field effect transistor Q1 drops from the saturation voltage V _max to the cutoff voltage V _G , the current flowing to the source via the drain of the field effect transistor Q1 gradually becomes smaller, and then flows through the LED. The current of D7 gradually becomes larger, the LED D7 lights up, and the brightness gradually becomes bright. In the present embodiment, since the voltage change between the input terminal 41 and the output terminal 42 of the control unit 4 has a negligible influence on the voltage across the other LEDs of the LED unit 3, the control unit 4 only controls the parallel connection thereto. The flashing frequency of LED D7 changes, and the brightness changes. Similarly, when the control circuit 40 of the control unit 4 is connected in parallel with other LEDs, the control of the operating state of the LED can be realized.

Therefore, the user can place the control unit in a different LED socket, from The LED flashing mode is controlled according to personal preference.

1‧‧‧Power plug

2‧‧‧LED socket

3‧‧‧LED unit

4‧‧‧Control unit

5‧‧‧Power cord

21‧‧‧ positive

22‧‧‧negative

23,24‧‧‧Metal shrapnel

25‧‧‧ Groove

26‧‧‧Shell

27‧‧‧Base

31‧‧‧ positive

32‧‧‧negative

40‧‧‧Control circuit

41‧‧‧ input

42‧‧‧ Output

43‧‧‧Oscillation circuit

44‧‧‧RC charging and discharging circuit

Q1‧‧‧ FET

D1‧‧‧ diode

R1‧‧‧first resistance

R2‧‧‧second resistance

C1‧‧‧first capacitor

C01‧‧‧second capacitor

U1‧‧‧ reverse gate

R3, R4‧‧‧ resistance

C0‧‧‧ capacitor

D0~D15‧‧‧LED

1 is a block diagram of an LED control device of the present invention.

2 is a schematic structural view of an LED control device of the present invention.

3 is an exploded view of an LED socket of the LED control device of the present invention.

4 is a diagram showing the connection relationship between the control unit of the LED control device of the present invention and the LED socket and the LED.

5 is a circuit diagram of a first embodiment of an LED control device according to the present invention, the LED control device controls a plurality of LEDs; and FIG. 6 is a control timing diagram of the LED control device shown in FIG. 5.

7 is a circuit diagram of a second embodiment of an LED control device according to the present invention, wherein the LED control device controls any of the LEDs; and FIG. 8 is a control timing diagram of the LED control device shown in FIG. 7 for controlling any of the LEDs.

1‧‧‧Power plug

2‧‧‧LED socket

3‧‧‧LED unit

4‧‧‧Control unit

Claims (8)

An LED control device comprising: a power plug, at least one LED socket, an LED unit comprising a plurality of LEDs, wherein the LED socket has a recess therein, and the LED control device further comprises at least one LED control unit The LED control unit is placed in a recess of the LED socket and controls the LED unit; the control unit further includes: a control circuit, an input end and an output end, the control circuit via the input The end and the output end are connected to the LED socket to control the operation of the LED unit, wherein when an LED of the LED unit is electrically connected to the LED socket, the control circuit is connected in parallel with the LED to control the LED The blinking frequency and the brightness change, when the LED socket is not electrically connected to one LED of the LED unit, the control circuit is connected in series with the plurality of LEDs of the LED unit to control the flicker frequency and brightness of the plurality of LEDs Variety. The LED control device of claim 1, wherein the LED socket comprises two metal domes, a positive pole and a negative pole, and when the control unit is placed in the recess of the LED socket, The positive and negative electrodes of the LED socket are electrically connected to the input end and the output end via the metal dome, respectively. The LED control device of claim 1, wherein the control circuit comprises an oscillating circuit, an RC charging and discharging circuit, and a field effect transistor, wherein the oscillating circuit outputs a square wave signal, and the RC is charged and discharged. The circuit converts the square wave signal into a triangular wave signal, and controls conduction and deactivation of the FET according to the triangular wave signal. The LED control device of claim 3, wherein a drain of the FET is electrically connected to the input terminal, and a source is electrically connected to the output The gate is electrically connected to the output of the RC charging and discharging circuit. The LED control device of claim 3, wherein the oscillating circuit comprises a diode, a first resistor, a second resistor, a first capacitor, a second capacitor, and a reverse gate. The reverse gate includes a power terminal, a power ground, an input terminal and an output terminal; the diode, the second resistor and the second capacitor are connected in series to the input end and the output end of the control unit, a power supply end of the reverse gate is connected between the second resistor and the second capacitor, a power ground end of the reverse gate is connected to an output end of the control unit, and an output end of the reverse gate is connected to the An input end of the RC charging and discharging circuit is fed back to the input end of the reverse gate via the first resistor. The LED control device of claim 5, wherein the first resistor is a variable resistor. The LED control device of claim 5, wherein the first capacitor is a variable capacitor. The LED control device of claim 2, wherein the control circuit is electrically connected to the positive and negative terminals of the LED socket via the input terminal and the output terminal, respectively.