Signal lamp

Abstract

The utility model relates to the technical field of LED lamps, solves the problem of unbalanced brightness output of a signal lamp in the prior art, and discloses a signal lamp, which comprises a first circuit board and LED lamp beads welded on the first circuit board, and further comprises a second circuit board, an LED driving control circuit is arranged on the second circuit board, and the LED driving control circuit is connected with the first circuit board. The LED drive control circuit comprises a rectifier bridge, a voltage detection circuit, a voltage-stabilized power supply circuit, a single chip microcomputer U3, a signal drive circuit and a constant current power supply circuit, output drive signals are adjusted by detecting input voltage changes in real time so that the brightness of the signal lamp can be output in a balanced mode, and a simple installation mode of a second circuit board with the LED drive control circuit is designed. The function of the signal lamp is optimized, the production cost is prevented from being sharply increased, and the problems of customer demand improvement and product cost limitation are effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of LED lamps, and in particular to a signal lamp. Background Art

[0002] At present, traffic lights used in urban roads generally use LEDs as light sources. Most of them use dozens to hundreds of small LEDs arranged in a signal pattern array and driven by a dedicated signal light power supply. The pre-set driving voltage and current can make the signal light output a constant brightness and can effectively protect the LED from voltage fluctuations.

[0003] Although the LED driver power supply in the prior art is designed to ensure constant voltage and current output, the drastic changes in the external input voltage cannot be completely eliminated, and the characteristics of each LED lamp bead are not completely consistent, resulting in inconsistency in the actual current and voltage flowing through the LED. Although this inconsistency will not cause premature damage to the LED, it will cause an imbalance in the overall brightness of the signal light. Usually a slight imbalance is acceptable, but in some special applications, a serious imbalance will cause adverse effects, resulting in a large number of user complaints and high soothing costs. Utility Model Content

[0004] The purpose of the present application is to overcome the problem of unbalanced brightness output of signal lights in the prior art and to provide a signal light.

[0005] Specifically, the signal lamp comprises a first circuit board and an LED lamp bead welded on the first circuit board, and further comprises: a second circuit board, on which an LED driving control circuit is arranged;

[0006] Among them, the LED drive control circuit includes a rectifier bridge, the input end of the rectifier bridge is used to connect to alternating current, the output end of the rectifier bridge is connected to a voltage-stabilized power supply circuit and a constant current power supply circuit, the output end of the voltage-stabilized power supply circuit is connected to the power supply end of the single-chip microcomputer U3, the output end of the single-chip microcomputer U3 is electrically connected to a signal drive circuit, the output end of the signal drive circuit is electrically connected to the constant current power supply circuit, the single-chip microcomputer U3 is also electrically connected to a voltage detection circuit for detecting the input voltage of the rectifier bridge, and the LED lamp beads are all electrically connected to the output end of the constant current power supply circuit.

[0007] Furthermore, the second circuit board is welded to the back side of the first circuit board, and the second circuit board is preset with a plurality of welding holes, and the welding holes are used to weld the second circuit board to the first circuit board and realize the electrical connection between the first circuit board and the second circuit board.

[0008] Furthermore, the two input ends of the rectifier bridge are respectively connected to the neutral line and the live line of the alternating current, one of the output ends of the rectifier bridge is grounded, and the other output end of the rectifier bridge is connected to the voltage-stabilized power supply circuit and the constant current power supply circuit.

[0009] Furthermore, the voltage-stabilizing power supply circuit includes a voltage-stabilizing chip U5, the input end of the voltage-stabilizing chip U5 is connected to the positive electrode of the first capacitor C1 and the output end of the rectifier bridge, the output end of the voltage-stabilizing chip U5 is connected to the positive electrode of the second capacitor C2 and the power supply end of the single-chip computer U3, and the negative electrode of the first capacitor C1, the negative electrode of the second capacitor C2 and the ground pin of the voltage-stabilizing chip U5 are all grounded.

[0010] Furthermore, the signal driving circuit includes an N-channel MOSFET transistor Q1, a gate of the N-channel MOSFET transistor Q1 is electrically connected to the single-chip computer U3, a source of the N-channel MOSFET transistor Q1 is grounded, a drain of the N-channel MOSFET transistor Q1 is connected to a fifth resistor R5, and the other end of the fifth resistor R5 is connected to a voltage source.

[0011] Furthermore, the voltage-stabilized power supply circuit includes a power supply chip U1, the LX pin of the power supply chip U1 is electrically connected to an inductor L and a voltage-stabilizing diode D, the other end of the inductor L is connected to the negative electrode of the LED lamp bead, the other end of the voltage-stabilizing diode D is connected to the output end of the rectifier bridge and the VIN pin of the power supply chip U1, a sixth resistor R6 is connected between the VIN pin and the Isense pin of the power supply chip U1, the Isense pin of the power supply chip U1 is connected to the positive electrode of the LED lamp bead, the ADJ pin of the power supply chip U1 is electrically connected to the drain of the N-channel MOSFET transistor Q1, and the ground pin of the power supply chip U1 is grounded.

[0012] Furthermore, the voltage detection circuit includes an operational amplifier U2, a power supply end of the operational amplifier U2 is connected to a voltage source, a ground pin of the operational amplifier U2 is grounded, a positive input end of the operational amplifier U2 is connected to a first resistor R1 and a second resistor R2, the other end of the first resistor R1 is connected to the live wire of the alternating current, the other end of the second resistor R2 is grounded, a negative input end of the operational amplifier U2 is connected to a third resistor R3 and a fourth resistor R4, the other end of the third resistor R3 is connected to the neutral wire of the alternating current, the other end of the fourth resistor R4 is grounded, and the output end of the operational amplifier U2 is connected to the single-chip computer U3.

[0013] Furthermore, the alternating current is provided by a transformer, an input end of the transformer is connected to an alternating current power source, and two input ends of the rectifier bridge are respectively connected to two output ends of the transformer.

[0014] The present application has the following beneficial effects: the traffic light of the present application has an LED drive control circuit controlled by a single-chip computer U3, which adjusts the output drive signal by real-time detection of input voltage changes so that the brightness of the traffic light reaches a relatively balanced output. At the same time, it also has relatively friendly processing and assembly characteristics, so that the overall cost of the traffic light can be provided with a small amplitude to achieve a relatively balanced output of the brightness of the traffic light, and can withstand a certain range of voltage fluctuations, thereby avoiding customer complaints caused by unbalanced brightness of the traffic light and reducing customer care costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a schematic diagram of the structure of the front side of a signal light according to an embodiment of the present application;

[0018] Figure 2 This is a schematic structural diagram of the back side of a signal light according to an embodiment of the present application;

[0019] Figure 3 is a circuit block diagram of an LED drive control circuit in a signal lamp according to an embodiment of the present application;

[0020] Figure 4 is a circuit diagram of a rectifier bridge in a signal lamp according to an embodiment of the present application;

[0021] Figure 5 is a circuit diagram of a voltage-stabilized power supply circuit in a signal lamp according to an embodiment of the present application;

[0022] Figure 6 is a circuit diagram of a signal driving circuit and a constant current power supply circuit in a signal lamp according to an embodiment of the present application;

[0023] Figure 7 is a schematic diagram of a single chip microcomputer in a signal light according to an embodiment of the present application;

[0024] Figure 8 It is a schematic diagram of a lead-out terminal J6 of a single-chip microcomputer in a signal light in an embodiment of the present application;

[0025] Fig. 9 This is a circuit diagram of a single voltage detection circuit in a signal lamp according to an embodiment of the present application.

[0026] Reference numerals:

[0027] 1. First circuit board; 2. LED lamp beads; 3. Second circuit board; 4. LED drive control circuit; 401. Rectifier bridge; 402. Voltage-stabilized power supply circuit; 403. Constant current power supply circuit; 404. Signal drive circuit; 405. Voltage detection circuit; 5. Soldering hole; 6. Transformer. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0029] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] See also Figure 1-Figure 2, a preferred embodiment of the present application, a signal lamp, comprising a first circuit board 1 and an LED lamp bead 2 welded on the first circuit board 1, and further comprising: a second circuit board 3, on which an LED driving control circuit 4 is arranged, wherein the second circuit board 3 is welded to the back of the first circuit board 1, and the second circuit board 3 is preset with a plurality of welding holes 5, and generally, the number of welding holes 5 is at least six, which are welded to the back of the first circuit board 1 with solder, and the LED lamp bead 2 is welded on the front of the first circuit board 1 to establish an electrical connection between the control circuit and the LED lamp board, and the welding holes 5 are used to weld the second circuit board 3 to the first circuit board 1 and realize the electrical connection between the first circuit board 1 and the second circuit board 3;

[0032] like Figure 3 As shown, the LED drive control circuit 4 includes a rectifier bridge 401, the input end of the rectifier bridge 401 is used to connect to alternating current, the output end of the rectifier bridge 401 is connected to a voltage-stabilized power supply circuit 402 and a constant current power supply circuit 403, the output end of the voltage-stabilized power supply circuit 402 is connected to the power supply end of the single-chip microcomputer U3, the output end of the single-chip microcomputer U3 is electrically connected to a signal drive circuit 404, the output end of the signal drive circuit 404 is electrically connected to the constant current power supply circuit 403, the single-chip microcomputer U3 is also electrically connected to a voltage detection circuit 405 for detecting the input voltage of the rectifier bridge 401, and the LED lamp beads 2 are all electrically connected to the output end of the constant current power supply circuit 403.

[0033] like Figure 4 As shown, the model of the rectifier bridge 401 is ABS210, and the AC power is provided by the transformer 6. The input end of the transformer 6 is connected to the AC power supply. The two input ends of the rectifier bridge 401 are respectively connected to the two output ends of the transformer 6. J1 is the 24V AC power input by the transformer 6, marked with VI+ and VI- to connect the AC input end of the rectifier bridge 401. The rectified output signal is marked as +24V and GND, which is used as the signal light power supply. Capacitor smoothing will be used in the next level of power supply.

[0034] like Figure 5 As shown, the voltage stabilizing power supply circuit 402 includes a voltage stabilizing chip U5, the input end of the voltage stabilizing chip U5 is connected to the positive electrode of the first capacitor C1 and the output end of the rectifier bridge 401, the output end of the voltage stabilizing chip U5 is connected to the positive electrode of the second capacitor C2 and the power supply end of the single-chip microcomputer U3, the negative electrode of the first capacitor C1, the negative electrode of the second capacitor C2 and the ground pin of the voltage stabilizing chip U5 are all grounded, wherein the voltage stabilizing chip U5 model is CJ7805, the power output by the transformer 6 is smoothed by a capacitor before being input into the circuit of the voltage stabilizing chip U5, and 5V DC is output through the voltage stabilizing chip U5 to supply the subsequent single-chip microcomputer U3 and the operational amplifier U2.

[0035] like Fig. 9As shown, the voltage detection circuit 405 includes an operational amplifier U2, the power supply end of the operational amplifier U2 is connected to a voltage source, the ground pin of the operational amplifier U2 is grounded, the positive input end of the operational amplifier U2 is connected to a first resistor R1 and a second resistor R2, the other end of the first resistor R1 is connected to the live wire of the alternating current, the other end of the second resistor R2 is grounded, the negative input end of the operational amplifier U2 is connected to a third resistor R3 and a fourth resistor R4, the other end of the third resistor R3 is connected to the neutral wire of the alternating current, the other end of the fourth resistor R4 is grounded, and the output end of the operational amplifier U2 is connected to the single-chip computer U3, wherein the model of the operational amplifier U2 is LM2904, and the input stage has two groups of voltage transformers, which respectively sample and detect the two signal lines output by the transformer 6, and the signal output by the operational amplifier U2 is marked as DTV and transmitted to the input IO pin of the single-chip computer U3.

[0036] like Figure 7 and Figure 8 As shown, the model of the single-chip microcomputer U3 is STC8G1K08A, capacitors C5 and C6 are used for power decoupling of the single-chip microcomputer U3, and J6 is a lead terminal for easy program burning and debugging. In this embodiment, the single-chip microcomputer U3 mainly uses the IO pin to realize DTV input detection to determine the change of the input voltage signal, enables or changes the CTL power control signal output according to the input change, and realizes the balanced control of the brightness output of the LED lamp bead 2. The reserved DTV2 detection pin and CTL2 control pin are used for customized detection of other possible input signals or control.

[0037] like Figure 6 As shown, the signal driving circuit 404 includes an N-channel MOSFET transistor Q1, the gate of which is electrically connected to the single-chip computer U3, the source of which is grounded, the drain of which is connected to a fifth resistor R5, the other end of which is connected to a voltage source, wherein the model of the N-channel MOSFET transistor Q1 is 2N7002, and the signal driving circuit 404 composed of the N-channel MOSFET transistor Q1 and the resistor R5 inverts the CTL signal and drives it to output to the subsequent power supply control input terminal.

[0038] like Figure 6As shown, the voltage-stabilized power supply circuit 402 includes a power chip U1, the LX pin of the power chip U1 is electrically connected to an inductor L and a voltage-stabilizing diode D, the other end of the inductor L is connected to the negative electrode of the LED lamp bead 2, the other end of the voltage-stabilizing diode D is connected to the output end of the rectifier bridge 401 and the VIN pin of the power chip U1, a sixth resistor R6 is connected between the VIN pin and the Isense pin of the power chip U1, the Isense pin of the power chip U1 is connected to the positive electrode of the LED lamp bead 2, the ADJ pin of the power chip U1 is electrically connected to the drain of the N-channel MOSFET transistor Q1, and the ground pin of the power chip U1 is grounded, wherein the power supply The model of chip U1 is MT7201C+. The +24V power supply has been smoothed in the aforementioned circuit and transmitted to pin 5 of the power chip U1. Pin 5 of the power chip U1 is connected to the voltage regulator diode D for output freewheeling. The sixth resistor R6 is a sampling resistor connecting pin 5 and pin 4 to control the output current to the VO+ pin of the output terminal J3; the inductor L is connected to pin 1 of the power chip U1 and the VO- pin of the output terminal J3; the VO+ and VO- outputted by the output terminal J3 are the voltage and current outputs supplied to the LED lamp bead 2; pin 2 of the power chip U1 is connected to the negative power supply GND; pin 3 of the power chip U1 is the input control signal, which is connected to the previous CTL signal after inverting drive.

[0039] In this embodiment, the signal light includes a first circuit board 1, LED lamp beads 2, a second circuit board 3, an LED drive control circuit 4 and a transformer 6, wherein the first circuit board 1 is the light source of the signal light and is installed with a signal indication pattern formed by the LED lamp beads 2. An installation slot is reserved on the first circuit board 1 for installing the second circuit board 3. The two can be directly welded without the need for additional connectors, and the installation is convenient and firm. Among them, there are several welding holes 5 on the second circuit board 3, at least 6 holes are required, which can be soldered to the back of the first circuit board 1 with solder to establish an electrical connection between the LED drive control circuit 4 and the first circuit board 1. The LED drive control circuit 4 includes a rectifier bridge 401, a voltage detection circuit 405, a voltage-stabilized power supply circuit 402, a single-chip microcomputer U3, a signal drive circuit 404, and a constant current power supply circuit 403. Among them, the rectifier bridge 401 receives the 24VAC input power of the transformer 6, and one output is used as a power supply to the voltage-stabilized power supply circuit 402 and the constant current power supply circuit 403, and the other output is sent to the voltage detection circuit 405 to detect the input voltage signal; the voltage detection circuit 405 uses an operational amplifier to amplify the input signal and then transmits it to the single-chip microcomputer U3 to detect IO, and the single-chip microcomputer U3 determines the change of the input voltage; the single-chip microcomputer U3 adjusts the power control signal according to the input voltage change detected by IO, and controls the output current of the constant current power supply circuit 403 through the signal drive circuit 404.

[0040] This embodiment uses the single-chip computer U3 to monitor the input signal voltage change in real time to control the constant current output to achieve the brightness balance of the signal light, and designs a simple installation method for the second circuit board 3 with the LED drive control circuit 4, so as to optimize the function of the signal light while avoiding the soaring production cost; compared with the original product, the newly designed signal light can avoid the brightness imbalance caused by voltage change conditions, and effectively solve the problem of increasing customer demand and product cost limitation.

[0041] The above are only preferred specific implementations of the present application; however, the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved ideas of the present application within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A signal lamp, comprising a first circuit board and an LED lamp bead welded on the first circuit board, characterized in that: Also includes: A second circuit board, on which an LED drive control circuit is disposed; Among them, the LED drive control circuit includes a rectifier bridge, the input end of the rectifier bridge is used to connect to alternating current, the output end of the rectifier bridge is connected to a voltage-stabilized power supply circuit and a constant current power supply circuit, the output end of the voltage-stabilized power supply circuit is connected to the power supply end of the single-chip microcomputer U3, the output end of the single-chip microcomputer U3 is electrically connected to a signal drive circuit, the output end of the signal drive circuit is electrically connected to the constant current power supply circuit, the single-chip microcomputer U3 is also electrically connected to a voltage detection circuit for detecting the input voltage of the rectifier bridge, and the LED lamp beads are all electrically connected to the output end of the constant current power supply circuit.

2. A signal light according to claim 1, characterized in that: The second circuit board is welded to the back side of the first circuit board. The second circuit board is preset with a plurality of welding holes, and the welding holes are used to weld the second circuit board to the first circuit board and realize the electrical connection between the first circuit board and the second circuit board.

3. A signal light according to claim 1, characterized in that: The two input ends of the rectifier bridge are respectively connected to the neutral line and the live line of the alternating current, one of the output ends of the rectifier bridge is grounded, and the other output end of the rectifier bridge is connected to a voltage-stabilized power supply circuit and a constant current power supply circuit.

4. A signal light according to claim 1, characterized in that: The voltage-stabilizing power supply circuit includes a voltage-stabilizing chip U5, the input end of the voltage-stabilizing chip U5 is connected to the positive electrode of the first capacitor C1 and the output end of the rectifier bridge, the output end of the voltage-stabilizing chip U5 is connected to the positive electrode of the second capacitor C2 and the power supply end of the single-chip computer U3, and the negative electrode of the first capacitor C1, the negative electrode of the second capacitor C2 and the ground pin of the voltage-stabilizing chip U5 are all grounded.

5. A signal light according to claim 1, characterized in that: The signal driving circuit includes an N-channel MOSFET transistor Q1, a gate of the N-channel MOSFET transistor Q1 is electrically connected to the single-chip computer U3, a source of the N-channel MOSFET transistor Q1 is grounded, a drain of the N-channel MOSFET transistor Q1 is connected to a fifth resistor R5, and the other end of the fifth resistor R5 is connected to a voltage source.

6. A signal light according to claim 5, characterized in that: The voltage-stabilized power supply circuit includes a power chip U1, an LX pin of the power chip U1 is electrically connected to an inductor L and a voltage-stabilizing diode D, the other end of the inductor L is connected to the negative electrode of the LED lamp bead, the other end of the voltage-stabilizing diode D is connected to the output end of the rectifier bridge and the VIN pin of the power chip U1, a sixth resistor R6 is connected between the VIN pin and the Isense pin of the power chip U1, the Isense pin of the power chip U1 is connected to the positive electrode of the LED lamp bead, the ADJ pin of the power chip U1 is electrically connected to the drain of the N-channel MOSFET transistor Q1, and the ground pin of the power chip U1 is grounded.

7. A signal light according to claim 1, characterized in that: The voltage detection circuit includes an operational amplifier U2, a power supply end of the operational amplifier U2 is connected to a voltage source, a ground pin of the operational amplifier U2 is grounded, a positive input end of the operational amplifier U2 is connected to a first resistor R1 and a second resistor R2, the other end of the first resistor R1 is connected to the live wire of the alternating current, the other end of the second resistor R2 is grounded, a negative input end of the operational amplifier U2 is connected to a third resistor R3 and a fourth resistor R4, the other end of the third resistor R3 is connected to the neutral wire of the alternating current, the other end of the fourth resistor R4 is grounded, and the output end of the operational amplifier U2 is connected to the single-chip computer U3.

8. A signal light according to claim 1, characterized in that: The alternating current is provided by a transformer, an input end of the transformer is connected to an alternating current power source, and two input ends of the rectifier bridge are respectively connected to two output ends of the transformer.

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