Low-cost LED display switching system

Abstract

The utility model, which relates to the LED field, discloses a low-cost LED display switching system comprising a switch control module used for controlling whether to output a pulse signal to a signal adjusting module through a single button; the signal adjusting module is used for enabling the activated output pin to jump to the next bit after receiving a pulse signal, and enabling the activated output pin to output a voltage signal to the signal clamping module; the beneficial effects of the utility model are that the control is convenient, and three kinds of information of output voltage, current and power required by most power supplies in display can be displayed and switched through a unique button in a polling mode; the adaptability is high, and the system can be easily matched with any power supply needing to display the three kinds of information under the condition of extremely small change; the cost is low, the performance is reliable, and any code writing is not needed; due to expandability, nine kinds of content display can be switched at most through reasonable expansion.

Description

Technical Field

[0001] The utility model relates to the field of LEDs, in particular to a low-cost LED display switching system. Background Art

[0002] Most display solutions used in industrial products on the market are LCD-based. A few display solutions that use LED units also involve the use of MCU controllers and professional LED driver chips to control the display content. This results in high costs for LED display solutions and requires improvement. Utility Model Content

[0003] The purpose of the present invention is to provide a low-cost LED display switching system to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A low-cost LED display switching system, comprising:

[0006] The switch control module is used to control whether to output the pulse signal to the signal adjustment module through a single button;

[0007] The signal adjustment module is used to, after receiving a pulse signal, cause the activated output pin to jump to the next bit, and the activated output pin outputs a voltage signal to the signal clamping module;

[0008] The signal clamping module is composed of multiple signal clamping units connected in parallel. Each signal clamping unit corresponds to an output pin of the signal adjustment module. The signal clamping unit receives a voltage signal and outputs a fixed voltage to the display driver module. Different signal clamping units output different fixed voltages.

[0009] Display driver module, used to drive the LED digital tube to display specific values ​​based on the received fixed voltage signal;

[0010] The switch control module is connected to the signal adjustment module, the signal adjustment module is connected to the signal clamping module, and the signal clamping module is connected to the display driving module.

[0011] As a further solution of the present invention: the switch control module includes a switch SW1, one end of the switch SW1 is connected to a 15V voltage via a resistor, and the other end of the switch SW1 is connected to a signal adjustment module via a resistor.

[0012] As a further solution of the present invention: the signal adjustment module includes a chip U3, the model of chip U3 is CD4017, pin 14 of chip U3 is connected to the switch control module, pin 15 of chip U13 is connected to an output port of chip U13 through a resistor, and the remaining output ports of chip U13 are respectively connected to corresponding signal clamping units.

[0013] As a further solution of the present invention: the signal clamping unit includes a NOT gate U1D and an amplifier U2A, the input end of the NOT gate U1D is connected to the signal adjustment module, the output end of the NOT gate U1D is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to one end of the resistor R2 and the inverting end of the amplifier U2A, the non-inverting end of the amplifier U2A is connected to the fixed voltage U_AD, the output end of the amplifier U2A is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is connected to the other end of the resistor R2 and the display driving module.

[0014] As a further solution of the present invention: the display driver module includes a chip U4, the model of the chip U4 is ICL7107, the pin 31 of the chip U4 is connected to one end of the resistor R9 and one end of the resistor R11, the other end of the resistor R11 is grounded, and the other end of the resistor R9 is connected to the signal clamping unit.

[0015] Compared with the prior art, the present invention has the following beneficial effects: the present invention is easy to control, and the three types of information required to be displayed on the display of most power supplies, namely output voltage, current, and power, can be switched in a polling manner through a single button (switch SW1); the present invention is highly adaptable, and with minimal modification, the system can be easily combined with any power supply that requires the above three types of information to be displayed; the present invention is low-cost and reliable, and the system consists of an ICL7107 (LED driver), a CD4017 (tens counter), a CD40106 (not gate), and a general-purpose operational amplifier, with low cost and reliable performance, and does not require any code writing; the present invention is expandable, and with reasonable expansion, up to nine types of content can be switched for display. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the circuit diagram of a low-cost LED display switching system. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] See also Figure 1 , a low-cost LED display switching system, comprising:

[0019] The switch control module is used to control whether to output the pulse signal to the signal adjustment module through a single button;

[0020] The signal adjustment module is used to, after receiving a pulse signal, cause the activated output pin to jump to the next bit, and the activated output pin outputs a voltage signal to the signal clamping module;

[0021] The signal clamping module is composed of multiple signal clamping units connected in parallel. Each signal clamping unit corresponds to an output pin of the signal adjustment module. The signal clamping unit receives a voltage signal and outputs a fixed voltage to the display driver module. Different signal clamping units output different fixed voltages.

[0022] Display driver module, used to drive the LED digital tube to display specific values ​​based on the received fixed voltage signal;

[0023] The switch control module is connected to the signal adjustment module, the signal adjustment module is connected to the signal clamping module, and the signal clamping module is connected to the display driving module.

[0024] In this example: See Figure 1 The switch control module includes a switch SW1, one end of the switch SW1 is connected to a 15V voltage through a resistor, and the other end of the switch SW1 is connected to a signal adjustment module through a resistor.

[0025] The switch SW1 is a push-button switch that pops up when pressed. Each time it is pressed, a high-level pulse signal is output to the signal adjustment module.

[0026] In this example: See Figure 1 The signal adjustment module includes a chip U3, the model of the chip U3 is CD4017, the pin 14 of the chip U3 is connected to the switch control module, the pin 15 of the chip U13 is connected to an output port of the chip U13 through a resistor, and the remaining output ports of the chip U13 are respectively connected to the corresponding signal clamping units.

[0027] CD4017 is a decade counter / pulse distributor with ten output ports, namely pins 1, 2, 3, 4, 5, 6, 7, 9, 10, and 11. The number of signal clamp units is selected according to actual needs, for example Figure 1 In the example, the number of signal clamping units is 3. Since an output port is required to feed back to pin 15 of chip U13, a maximum of 9 signal clamping units can be set.

[0028] According to the CD4017 application manual, whenever pin 14 receives a pulse signal, the active output pin will jump to the next digit. For example, if pin 3 is currently active and receives a pulse signal, pin 2 will become active. When pin 4 is active and receives another pulse signal, pin 7 will become active and output a high level to pin 15. When pin 15 receives a high level, it will return to the lowest digit and start counting again, restarting at pin 3.

[0029] In this example: See Figure 1 The signal clamping unit includes a NOT gate U1D and an amplifier U2A. The input end of the NOT gate U1D is connected to the signal adjustment module, the output end of the NOT gate U1D is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to one end of the resistor R2 and the inverting end of the amplifier U2A, the non-inverting end of the amplifier U2A is connected to the fixed voltage U_AD, the output end of the amplifier U2A is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is connected to the other end of the resistor R2 and the display driving module.

[0030] Figure 1 Three signal clamping units are provided. Using these three signal clamping units as an example, the output of the CD4017 is connected via a NOT gate to the input signal and an op amp, forming a follower circuit to form the output signal selector. For example, when pin 3 of chip U3 is activated and pins 2 and 4 are both low, the output voltage of inverter U1D is low, while the outputs of inverters U1E and U1F are high. This causes the inverting terminal of the corresponding amplifier U2A to be grounded (configured as a follower output). The high-level input at the inverting terminal and the reverse-blocking diodes at the output terminals of inverters U2B and U2C render the op amps inactive (skipped). The outputs of the three signal clamping units are always clamped by the U_AD signal.

[0031] Likewise, depending on whether the switch SW1 is pressed to output a pulse signal, the output terminals of the three signal clamping units are clamped by the J_AD or P_AD signal.

[0032] In this example: See Figure 1 The display driver module includes a chip U4, the model of the chip U4 is ICL7107, the pin 31 of the chip U4 is connected to one end of the resistor R9 and one end of the resistor R11, the other end of the resistor R11 is grounded, and the other end of the resistor R9 is connected to the signal clamping unit.

[0033] ICL7107 is a high-performance, low-power 3.5-bit dual-integral A / D converter chip that can directly drive LED digital tubes.

[0034] The fixed voltage signals U_AD, J_AD, and P_AD are of different sizes, and the voltages fed back to the chip U4 through the resistors R9 and R11 are of different sizes. The chip U4 drives the LED digital tube to display different specific values. Therefore, the LED display is switched by pressing the switch SW1 each time.

[0035] The working principle of the utility model is as follows: the switch control module is used to control whether to output a pulse signal to the signal adjustment module through a single button; the signal adjustment module is used to, after receiving a pulse signal, the activated output pin will jump to the next bit, and the activated output pin outputs a voltage signal to the signal clamping module; the signal clamping module is composed of multiple signal clamping units in parallel, and each signal clamping unit corresponds to the output pin of the signal adjustment module one by one; the signal clamping unit is used to receive the voltage signal and output a fixed voltage to the display driving module; different signal clamping units output different fixed voltages; the display driving module is used to drive the LED digital tube to display a specific value based on the received fixed voltage signal.

[0036] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive.

[0037] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A low-cost LED display switching system, characterized in that: This low-cost LED display switching system includes: The switch control module is used to control whether to output the pulse signal to the signal adjustment module through a single button; The signal adjustment module is used to, after receiving a pulse signal, cause the activated output pin to jump to the next bit, and the activated output pin outputs a voltage signal to the signal clamping module; The signal clamping module is composed of multiple signal clamping units connected in parallel. Each signal clamping unit corresponds to an output pin of the signal adjustment module. The signal clamping unit receives a voltage signal and outputs a fixed voltage to the display driver module. Different signal clamping units output different fixed voltages. Display driver module, used to drive the LED digital tube to display specific values ​​based on the received fixed voltage signal; The switch control module is connected to the signal adjustment module, the signal adjustment module is connected to the signal clamping module, and the signal clamping module is connected to the display driving module.

2. The low-cost LED display switching system according to claim 1, characterized in that: The switch control module includes a switch SW1 , one end of the switch SW1 is connected to a 15V voltage via a resistor, and the other end of the switch SW1 is connected to a signal adjustment module via a resistor.

3. The low-cost LED display switching system according to claim 1, characterized in that: The signal adjustment module includes chip U3, the model of chip U3 is CD4017, pin 14 of chip U3 is connected to the switch control module, pin 15 of chip U13 is connected to an output port of chip U13 through a resistor, and the remaining output ports of chip U13 are respectively connected to corresponding signal clamping units.

4. The low-cost LED display switching system according to claim 3, characterized in that: The signal clamping unit includes a NOT gate U1D and an amplifier U2A. The input end of the NOT gate U1D is connected to the signal adjustment module, the output end of the NOT gate U1D is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to one end of the resistor R2 and the inverting end of the amplifier U2A, the non-inverting end of the amplifier U2A is connected to the fixed voltage U_AD, the output end of the amplifier U2A is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is connected to the other end of the resistor R2 and the display driving module.

5. The low-cost LED display switching system according to claim 1, characterized in that: The display driver module includes a chip U4. The model of the chip U4 is ICL7107. Pin 31 of the chip U4 is connected to one end of the resistor R9 and one end of the resistor R11. The other end of the resistor R11 is grounded. The other end of the resistor R9 is connected to the signal clamping unit.

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