Improved LED module circuit capable of avoiding capacitor damage

Abstract

The utility model relates to the technical field of LED module circuits, in particular to an improved LED module circuit capable of avoiding capacitor damage, which comprises a DC power supply module, a rectifier module and a lighting module. According to the utility model, the rectification loop rectifies the direct current output by the DC power supply module and supplies power to the controllable circuit and the lighting LED, the lighting and brightness of the lighting LED are controlled by adjusting the controllable circuit, and the capacitor in the rectification loop is kept stable through the single-connection loop connected with the DC power supply module, so that the damage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of LED module circuits, in particular to an improved LED module circuit for avoiding capacitor damage. Background Art

[0002] LED modules are mainly used to display the night effects of advertising fonts and logos. With text or logos as the medium, they are installed on the top or wall of the building, and are equipped with LED lighting application control systems to perform dynamic video control of the text or logos. In some places with a strong entertainment atmosphere, LED light source modules have become one of the most important choices for companies to display their self-image.

[0003] For example, CN110418458A involves an improved LED driving circuit and circuit board, including a switch module, a resonant circuit, several groups of voltage conversion modules, and a dimming controller; the switch module is used to provide the rectified mains voltage to the input side of the resonant circuit through the action of the switch module; the resonant circuit is connected in series with several groups of voltage conversion modules; the output end of each group of voltage conversion modules is connected to a group of LED strings connected in series; the dimming controller is connected to each group of voltage conversion modules respectively to adjust the brightness of the LED string by adjusting the voltage. The driving circuit drives multiple groups of LED strings connected in series by connecting multiple groups of transformers in series through a group of switch modules through a resonant circuit. The third winding connected to each transformer through the dimming controller has group and individual dimming functions, which simplifies the architecture of the driving circuit, greatly reduces the cost, and improves the conversion efficiency of the overall circuit. Since the DC power supply always has voltage fluctuations, a rectifier circuit is generally set for the normal operation of the LED module. However, when the voltage fluctuation output by the DC power supply is too large, it will cause damage to the capacitor in the rectifier circuit, causing the rectifier circuit to malfunction.

[0004] In order to ensure that the capacitor will not be damaged when the output voltage of the DC power supply fluctuates too much, an improved LED module circuit that avoids capacitor damage is proposed. Utility Model Content

[0005] The purpose of the present invention is to provide an improved LED module circuit that avoids capacitor damage, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides an improved LED module circuit for avoiding capacitor damage, comprising a DC power supply module, a rectifier module and a lighting module, wherein the rectifier module comprises a rectifier circuit and a single-connection circuit, the lighting module comprises a controllable circuit and a lighting LED, the DC power supply circuit is connected to the rectifier circuit and the single-connection circuit, the rectifier circuit is connected to the single-connection circuit and the controllable circuit, and the controllable circuit is connected to the lighting LED;

[0007] The DC power supply module supplies power to the controllable circuit and the lighting LED through the rectifier circuit, and adjusts the lighting LED through the controllable circuit, wherein the capacitor in the rectifier circuit is connected to the DC power supply module through the single-connection circuit to avoid damage.

[0008] As a further improvement of the present technical solution, the DC power supply module is a linear regulated power supply.

[0009] As a further improvement of the technical solution, the rectifier circuit includes transistors Q1 and Q2, wherein;

[0010] The base of the transistor Q1 is connected to the resistor R2 and connected to the emitter of the transistor Q2, the collector of the transistor Q1 is connected to the resistor R1 and connected to the base of the transistor Q2, the emitter of the transistor Q1 is connected to the other end of the resistor R2, the capacitor C1 and grounded, and the capacitor C1 is connected to the other end of the resistor R1 and connected to DC12V.

[0011] As a further improvement of the technical solution, the single-connection loop includes a first connection loop and a second connection loop, the capacitor C1 is connected to the DC power supply module through the first connection loop, and the capacitor C1 is grounded through the second connection loop.

[0012] As a further improvement of the technical solution, the lighting LED includes a light emitting diode LED, the controllable circuit includes a MOS tube Q3,

[0013] The G terminal of the MOS tube Q3 is connected to the capacitor C11 and connected to the key switches K1 and K2, the capacitor C11 is grounded, the key switch K1 is connected to the resistor R11, the key switch K2 is connected to the resistor R12, and the resistor R12 is grounded;

[0014] The S terminal of the MOS tube Q3 is grounded, the D terminal of the MOS tube Q3 is connected to the light emitting diode LED, the light emitting diode LED is connected to the resistor R13, the resistor R13 is connected to the other end of the resistor R11 and connected to the Vo terminal.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] In the improved LED module circuit for avoiding capacitor damage, the direct current output by the DC power module is rectified by the rectifier circuit to supply power to the controllable circuit and the lighting LED, and the lighting and brightness of the lighting LED are controlled by adjusting the controllable circuit. The capacitor in the rectifier circuit is kept stable through a single-connection circuit connected to the DC power module, thereby avoiding damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 For the existing circuit principle frame Figure 1 ;

[0018] Figure 2 For the existing circuit principle frame Figure 2 ;

[0019] Figure 3 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 4 This is a circuit diagram of a rectifier circuit of the utility model;

[0021] Figure 5 This is a controllable circuit diagram of the utility model. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-Figure 2 As shown, the LED module is an independently working unit. For the convenience of use, it is cascaded with wires. The actual circuit between the modules is in parallel, and the power supply extends backward through the main line. However, the connected DC power supply cannot be stable at all times in actual situations. There may be other factors that cause the voltage to be too high, or there may be AC ​​current flowing in. If the stable DC voltage cannot be guaranteed, it is very likely to cause high power and damage to the module. In severe cases, it may cause fire. Therefore, in actual production, putting a capacitor in the module can greatly reduce the probability of module damage caused by unstable power supply.

[0024] However, in actual production use, a problem was found:

[0025] If the voltage value of the DC power supply is too large, or the product is immersed in water and short-circuited, or the capacitor is hit during injection molding, resulting in excessive current, and the capacitor is the most easily burned out of all components. If the PCB is made of FR-4 material, it is more likely to catch fire, and there is a relatively high safety risk.

[0026] The existing solution is to not only connect a capacitor between the power supply VCC and GND terminals, but also add a resistor to prevent excessive current and thus prevent the capacitor from burning out. However, this conventional solution has the following disadvantages:

[0027] 1. Increase resistance and drive circuit component cost;

[0028] 2. Increase the module circuit board area, increase the circuit board cost, make the appearance size larger, and also affect the appearance and its application.

[0029] Therefore, please refer to Figure 3-Figure 5 As shown, this embodiment provides an improved LED module circuit for avoiding capacitor damage, including a DC power module, a rectifier module and a lighting module, the rectifier module includes a rectifier circuit and a single-connection circuit, the lighting module includes a controllable circuit and a lighting LED, the DC power circuit is connected to the rectifier circuit and the single-connection circuit, the rectifier circuit is connected to the single-connection circuit and the controllable circuit, and the controllable circuit is connected to the lighting LED;

[0030] The DC power supply module supplies power to the controllable circuit and the lighting LED through a rectifier circuit, and adjusts the lighting LED through the controllable circuit, wherein the capacitor in the rectifier circuit is connected to the DC power supply module through a single-connection circuit to avoid damage.

[0031] Principle: The rectifier circuit rectifies the DC power output by the DC power module to power the controllable circuit and the lighting LED, and controls the lighting and brightness of the lighting LED by adjusting the controllable circuit. The capacitor in the rectifier circuit is kept stable through a single-circuit connection with the DC power module to avoid damage.

[0032] The DC power supply module is a linear regulated power supply. The circuit structure of the linear regulated power supply is simple, with fewer electronic components, which is conducive to reducing costs, and the output ripple of the linear regulated power supply is small.

[0033] The rectifier circuit includes transistors Q1 and Q2, where;

[0034] The base of transistor Q1 is connected to resistor R2 and connected to the emitter of transistor Q2, the collector of transistor Q1 is connected to resistor R1 and connected to the base of transistor Q2, the emitter of transistor Q1 is connected to the other end of resistor R2, capacitor C1 and grounded, and capacitor C1 is connected to the other end of resistor R1 and connected to DC12V.

[0035] In the rectifier circuit, capacitor C1 has a good filtering effect. When the voltage output by the DC power module changes, due to the charging effect of capacitor C1, the voltage at both ends will not change suddenly, thus ensuring the stability of the power supply.

[0036] The single-connection loop includes a first connection loop and a second connection loop. The capacitor C1 is connected to the DC power module through the first connection loop, and the capacitor C1 is grounded through the second connection loop. When designing the PCB circuit, a narrow line is specially drawn to directly connect the capacitor C1 to the VCC end and the GND end. This line does not contact the large-area copper plating of the VCC end and the GND end. It can be regarded as a thin and long line that is separated from the copper plating of the VCC end and the GND end to connect to the capacitor. The width is determined by specific conditions. Generally, it is the minimum line width required for the circuit operation. If there are other requirements, they can be adjusted according to the comparison of the copper foil line (width) overload capacity and the current situation. By connecting the capacitor C1 to the DC power module and grounding it, the damage of the capacitor C1 due to overload can be avoided.

[0037] The lighting LED includes a light emitting diode LED, and the controllable circuit includes a MOS tube Q3.

[0038] The G terminal of the MOS tube Q3 is connected to the capacitor C11 and connected to the key switches K1 and K2, the capacitor C11 is grounded, the key switch K1 is connected to the resistor R11, the key switch K2 is connected to the resistor R12, and the resistor R12 is grounded;

[0039] The S terminal of the MOS tube Q3 is grounded, the D terminal of the MOS tube Q3 is connected to the light emitting diode LED, the light emitting diode LED is connected to the resistor R13, the resistor R13 is connected to the other end of the resistor R11 and connected to the Vo terminal.

[0040] When the key switch K1 is pressed, the Vo terminal charges the capacitor C11 through the resistor R11, the gate voltage of the MOS tube Q3 gradually increases, and the current flowing through the MOS tube increases accordingly, so that the light-emitting diode LED is lit and the brightness gradually increases. Correspondingly, when the key switch K2 is pressed, the capacitor C11 discharges through the resistor R12, so that the gate voltage of the MOS tube Q3 gradually decreases, and the current flowing through the MOS tube Q3 decreases, and the brightness of the light-emitting diode LED decreases until it goes out. By changing the time of pressing the key switches K1 and K2, the brightness of the light-emitting diode LED can be controlled.

[0041] The improved LED module circuit of the present embodiment avoids capacitor damage. When in use, the direct current output by the DC power module is rectified by the rectifier circuit to supply power to the controllable circuit and the lighting LED. By adjusting the controllable circuit, the lighting LED can be turned on and off by pressing the key switches K1 and K2. By changing the time of pressing the key switches K1 and K2, the brightness of the light-emitting diode LED can be controlled. The capacitor in the rectifier circuit is kept stable by a single-connection circuit connected to the DC power module, thereby avoiding damage.

[0042] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. An improved LED module circuit for preventing capacitor damage, characterized in that: It comprises a DC power supply module, a rectifier module and a lighting module, wherein the rectifier module comprises a rectifier circuit and a single-connection circuit, the lighting module comprises a controllable circuit and a lighting LED, the DC power supply circuit is connected to the rectifier circuit and the single-connection circuit, the rectifier circuit is connected to the single-connection circuit and the controllable circuit, and the controllable circuit is connected to the lighting LED; The DC power supply module supplies power to the controllable circuit and the lighting LED through the rectifier circuit, and adjusts the lighting LED through the controllable circuit, wherein the capacitor in the rectifier circuit is connected to the DC power supply module through the single-connection circuit to avoid damage.

2. The improved LED module circuit for avoiding capacitor damage according to claim 1, characterized in that: The DC power supply module is a linear voltage-regulated power supply.

3. The improved LED module circuit for avoiding capacitor damage according to claim 1, characterized in that: The rectifier circuit includes transistors Q1 and Q2, wherein; The base of the transistor Q1 is connected to the resistor R2 and connected to the emitter of the transistor Q2, the collector of the transistor Q1 is connected to the resistor R1 and connected to the base of the transistor Q2, the emitter of the transistor Q1 is connected to the other end of the resistor R2, the capacitor C1 and grounded, and the capacitor C1 is connected to the other end of the resistor R1 and connected to DC12V.

4. The improved LED module circuit for avoiding capacitor damage according to claim 3, characterized in that: The single connection loop includes a first connection loop and a second connection loop. The capacitor C1 is connected to the DC power supply module through the first connection loop, and the capacitor C1 is grounded through the second connection loop.

5. The improved LED module circuit for avoiding capacitor damage according to claim 3, characterized in that: The lighting LED includes a light emitting diode LED, and the controllable circuit includes a MOS tube Q3. The G terminal of the MOS tube Q3 is connected to the capacitor C11 and connected to the key switches K1 and K2, the capacitor C11 is grounded, the key switch K1 is connected to the resistor R11, the key switch K2 is connected to the resistor R12, and the resistor R12 is grounded; The S terminal of the MOS tube Q3 is grounded, the D terminal of the MOS tube Q3 is connected to the light emitting diode LED, the light emitting diode LED is connected to the resistor R13, the resistor R13 is connected to the other end of the resistor R11 and connected to the Vo terminal.

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