Outdoor advertising machine power supply circuit

Abstract

The utility model discloses a power supply circuit of an outdoor advertising machine, which comprises a power supply circuit, and the power supply circuit comprises a transformer T and a rectifier bridge DB107. The input of the transformer T is connected with the commercial power, and the AC 220V voltage of the commercial power is transformed into the AC 12V voltage to be output; the input of the rectifier bridge DB107 is electrically connected with the output of the transformer T, and the rectifier bridge DB107 rectifies an AC12 voltage into a DC12 voltage; the voltage conversion circuit comprises an LM317 voltage stabilizer, an adjustable resistor RP1, a resistor R1, a capacitor C2 and a capacitor C3; a pin 1 of the LM317 voltage stabilizer is grounded through a variable resistor RP1, a pin 3 of the LM317 voltage stabilizer is electrically connected with an output end of a rectifier bridge DB107, and the pin 3 of the LM317 voltage stabilizer is also grounded through a capacitor C2; and one end of the resistor R1 is electrically connected with a pin 2 of the LM317 voltage stabilizer.

Description

Technical Field

[0001] This utility model relates to the field of outdoor advertising machine technology, and in particular to a power supply circuit for an outdoor advertising machine. Background Technology

[0002] Outdoor advertising displays are intelligent display devices designed specifically for outdoor environments and used for advertising. Currently, many outdoor advertising displays use DC 12V power adapters, which means they convert 220V alternating current (AC) to 12V direct current (DC) to power the device. However, the voltage can vary depending on the type of outdoor advertising display, thus requiring the design of a power supply circuit that can adjust the voltage.

[0003] Therefore, existing technologies have shortcomings and need to be improved. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a power supply circuit for an outdoor advertising machine, which adjusts the output voltage to achieve the desired power supply.

[0005] The technical solution of this utility model is as follows: A power supply circuit for an outdoor advertising machine, comprising:

[0006] The power supply circuit includes: a transformer T and a rectifier bridge DB107; the input of the transformer T is connected to the mains power and transforms the AC220V mains voltage into AC12V voltage for output; the input of the rectifier bridge DB107 is electrically connected to the output of the transformer T and rectifies the AC12V voltage into DC12V voltage.

[0007] A voltage conversion circuit includes an LM317 regulator, an adjustable resistor RP1, a resistor R1, a capacitor C2, and a capacitor C3. Pin 1 of the LM317 regulator is grounded via the variable resistor RP1, and pin 3 of the LM317 regulator is electrically connected to the output of a rectifier bridge DB107. Pin 3 of the LM317 regulator is also grounded via capacitor C2. One end of resistor R1 is electrically connected to pin 2 of the LM317 regulator, and the other end of resistor R1 is electrically connected to pin 1 of the LM317 regulator and one end of capacitor C3. The other end of capacitor C3 is grounded.

[0008] Pin 2 of the LM317 voltage regulator and the other end of capacitor C3 are also electrically connected to the power supply of the external outdoor advertising machine.

[0009] In the above technical solution, the voltage conversion circuit further includes a diode VD2, the anode of which is electrically connected to pin 3 of the LM317 voltage regulator, and the cathode of which is electrically connected to pin 2 of the LM317 voltage regulator.

[0010] In the above-mentioned technical solutions, the voltage conversion circuit also includes a diode VD1, the anode of which is electrically connected to pin 2 of the LM317 voltage regulator, and the cathode of which is electrically connected to pin 1 of the LM317 voltage regulator.

[0011] When applied to the above technical solutions, capacitor C2 is 0.33uF and capacitor C3 is 10uF.

[0012] In the above-mentioned technical solutions, the voltage conversion circuit also includes a capacitor C4, one end of which is electrically connected to pin 2 of the LM317 regulator, and the other end of which is grounded.

[0013] In all the above technical solutions, the capacitor C4 is 100uF.

[0014] When applied to the above technical solutions, the resistor R1 is 100Ω and the variable resistor RP1 is 5.1KΩ.

[0015] The beneficial effects of this utility model are as follows: This utility model transforms the AC220V power supply from the market into AC12V through transformer T1, and then rectifies the AC12V into DC12V through rectifier bridge DB107 to power the LM317 voltage regulator, thereby enabling the LM317 voltage regulator to work and output the regulated DC12V voltage to power the outdoor advertising machine.

[0016] When the power supply voltage of the outdoor advertising machine changes, the feedback voltage of the LM317 voltage regulator can be adjusted by the resistance value of the variable resistor RP1, thereby adjusting the output voltage of the LM317 voltage regulator. Attached Figure Description

[0017] Figure 1 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1 As shown: This embodiment provides a power supply circuit for an outdoor advertising machine, including:

[0020] The power supply circuit includes: a transformer T and a rectifier bridge DB107; the input of the transformer T is connected to the mains power and transforms the AC220V mains voltage into AC12V voltage for output; the input of the rectifier bridge DB107 is electrically connected to the output of the transformer T and rectifies the AC12V voltage into DC12V voltage.

[0021] A voltage conversion circuit includes an LM317 regulator, an adjustable resistor RP1, a resistor R1, a capacitor C2, and a capacitor C3. Pin 1 of the LM317 regulator is grounded via the variable resistor RP1, and pin 3 of the LM317 regulator is electrically connected to the output of a rectifier bridge DB107. Pin 3 of the LM317 regulator is also grounded via capacitor C2. One end of resistor R1 is electrically connected to pin 2 of the LM317 regulator, and the other end of resistor R1 is electrically connected to pin 1 of the LM317 regulator and one end of capacitor C3. The other end of capacitor C3 is grounded.

[0022] Pin 2 of the LM317 voltage regulator and the other end of capacitor C3 are also electrically connected to the power supply of the external outdoor advertising machine.

[0023] The transformer T1 transforms the AC220V market voltage into AC12V, and then the rectifier bridge DB107 rectifies the AC12V into DC12V to power the LM317 voltage regulator. This enables the LM317 voltage regulator to work and output the regulated DC12V voltage to power the outdoor advertising machine.

[0024] When the power supply voltage of the outdoor advertising machine changes, the feedback voltage of the LM317 voltage regulator can be adjusted by the resistance value of the variable resistor RP1, thereby adjusting the output voltage of the LM317 voltage regulator. Specifically, the adjustable voltage is from 1.25V to 37V.

[0025] In this embodiment, as Figure 1 As shown: The voltage conversion circuit also includes diode VD2, the anode of which is electrically connected to pin 3 of the LM317 regulator, and the cathode of which is electrically connected to pin 2 of the LM317 regulator;

[0026] The diode VD2 is used to prevent a short circuit at the input of the LM317 voltage regulator, thereby protecting the LM317 voltage regulator.

[0027] In this embodiment, as Figure 1 As shown: The voltage conversion circuit also includes a diode VD1, the anode of which is electrically connected to pin 2 of the LM317 regulator, and the cathode of which is electrically connected to pin 1 of the LM317 regulator;

[0028] Diode VD1 is used to prevent a short circuit at the output of the LM317 voltage regulator, thereby protecting the LM317 voltage regulator.

[0029] In this embodiment, as Figure 1As shown: capacitor C2 is 0.33uF, capacitor C3 is 10uF; the voltage conversion circuit also includes capacitor C4, one end of which is electrically connected to pin 2 of the LM317 regulator, and the other end of which is grounded; capacitor C4 is 100uF.

[0030] Among them, capacitor C2 is the filter capacitor at the input terminal of the LM317 voltage regulator, that is, it filters out the input terminal.

[0031] In this embodiment, as Figure 1 As shown: the resistor R1 is 100Ω, and the variable resistor RP1 is 5.1KΩ.

[0032] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A power supply circuit for an outdoor advertising machine, characterized in that, include: The power supply circuit includes: a transformer T and a rectifier bridge DB107; The input of the transformer T is connected to the mains power supply and transforms the AC220V mains voltage into AC12V voltage for output; the input of the rectifier bridge DB107 is electrically connected to the output of the transformer T and rectifies the AC12V voltage into DC12V voltage. A voltage conversion circuit includes an LM317 regulator, an adjustable resistor RP1, a resistor R1, a capacitor C2, and a capacitor C3. Pin 1 of the LM317 regulator is grounded via the variable resistor RP1, and pin 3 of the LM317 regulator is electrically connected to the output of a rectifier bridge DB107. Pin 3 of the LM317 regulator is also grounded via capacitor C2. One end of resistor R1 is electrically connected to pin 2 of the LM317 regulator, and the other end of resistor R1 is electrically connected to pin 1 of the LM317 regulator and one end of capacitor C3. The other end of capacitor C3 is grounded. Pin 2 of the LM317 voltage regulator and the other end of capacitor C3 are also electrically connected to the power supply of the external outdoor advertising machine.

2. The power supply circuit for an outdoor advertising machine according to claim 1, characterized in that: The voltage conversion circuit also includes a diode VD2, the anode of which is electrically connected to pin 3 of the LM317 regulator, and the cathode of which is electrically connected to pin 2 of the LM317 regulator.

3. The power supply circuit for an outdoor advertising machine according to claim 1, characterized in that: The voltage conversion circuit also includes a diode VD1, the anode of which is electrically connected to pin 2 of the LM317 regulator, and the cathode of which is electrically connected to pin 1 of the LM317 regulator.

4. The power supply circuit for an outdoor advertising machine according to claim 1, characterized in that: The capacitor C2 is 0.33uF and the capacitor C3 is 10uF.

5. The power supply circuit for an outdoor advertising machine according to claim 1, characterized in that: The voltage conversion circuit also includes capacitor C4, one end of which is electrically connected to pin 2 of the LM317 regulator, and the other end of which is grounded.

6. The power supply circuit for an outdoor advertising machine according to claim 5, characterized in that: The capacitor C4 is 100uF.

7. The power supply circuit for an outdoor advertising machine according to claim 1, characterized in that: The resistor R1 is 100Ω, and the variable resistor RP1 is 5.1KΩ.

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