CN105407586A - A kind of LED lamp - Google Patents

Abstract

An LED lamp includes at least one set of LED lamp modules, a current detection module, and a control module. Each of the at least one set of LED lamp modules includes a resistor and at least one LED lamp connected in series with the resistor. The current detection module is used to detect the current of the resistors in a group of LED lamp modules electrically connected with the current detection module. The control module is used to keep the current value of the resistor detected by the current detection module unchanged. Since the size of the resistor remains unchanged, the voltage applied to both ends of a group of LED lamp modules also remains unchanged, and each group of LED lamp modules is set in parallel, so that the voltage loaded on each group of LED lamp modules The voltage across the module also remains unchanged. Therefore, in the LED lamp, the current detection module and the control module are only provided in one group of LED lamp modules, and the current detection module and the control module may not be provided in the remaining LED lamp modules, thereby achieving the purpose of reducing costs .

Description

A kind of LED lamp

technical field

The invention relates to lighting system equipment, in particular to an LED lamp.

Background technique

In general daily life, various lighting devices can be seen everywhere, for example, fluorescent lamps, street lamps, table lamps, art lamps and the like. Among the above-mentioned lighting devices, traditionally most of them use tungsten filament bulbs as light sources. In recent years, light-emitting diodes (LEDs) have been used as a source of light due to advances in technology. What's more, in addition to lighting equipment, for general traffic signs, billboards, car lights, etc., light-emitting diodes are also used as light-emitting light sources instead. As mentioned above, the advantage of using light-emitting diodes as a light source is that it saves power and has higher brightness, so it has gradually become popular in use.

With the popularization of LED lamps, LED lamps are used in more and more occasions, such as shopping malls, hotels, and homes. Especially in shopping malls and hotels, since most of the lighting occasions are strip-shaped, a large number of strip-shaped lamps are required. For the convenience of installation, most of these strip-shaped lamps are interconnected, that is, they are formed by plugging and interconnecting multiple lamp groups. Although there are many constant-voltage lamps in the existing resistor-series diode scheme, the general efficiency is very low. At the same time, compared with the luminaire using the DC/DC converter solution, the luminaire using the DC/DC converter will have a 20% increase in efficiency. However, in general strip lamps using DC/DC converters, lamps of various lengths and specifications will have a DC/DC converter. However, the price of the DC/DC converter is relatively expensive, so the lamps with this interconnection method will have a relatively high cost.

Contents of the invention

In view of this, it is necessary to provide an LED lamp capable of reducing the cost of interconnected lamps, so as to overcome the above disadvantages.

An LED lamp includes at least one set of LED lamp modules connected in parallel with each other, a current detection module electrically connected to one of the at least one set of LED lamp modules, and a current detection module electrically connected to the current detection module. Connected control modules. Each of the at least one set of LED lamp modules includes a resistor and at least one LED lamp connected in series with the resistor. The current detection module is used to detect the current of the resistors in a group of LED lamp modules electrically connected to the current detection module. The control module is used to keep the current value of the resistor detected by the current detection module unchanged.

Compared with the prior art, since the current detection module detects the current value of a resistor of the group of LED lamp modules, the control module keeps the current value flowing through the resistor constant according to the magnitude of the current value. Since the size of the resistor remains constant, the total resistance value remains unchanged when the number of LED lamps in a group of LED lamp modules remains unchanged, so that the voltage applied to both ends of a group of LED lamp modules and each group of LED lighting modules is set in parallel, so that the voltage loaded on both ends of each group of LED lighting modules also remains unchanged. Therefore, in the LED lamp, the current detection module and the control module are only provided in one group of LED lamp modules, and the current detection module and the control module may not be provided in the remaining LED lamp modules, thereby achieving the purpose of reducing costs .

Description of drawings

Embodiments of the present invention are described below in conjunction with the accompanying drawings, wherein.

Fig. 1 is a schematic circuit diagram of an LED lamp provided by the present invention.

FIG. 2 is a circuit diagram of the LED lamp in FIG. 1 .

detailed description

Specific embodiments of the present invention will be described in further detail below based on the accompanying drawings. It should be understood that the specific embodiments described here are only examples, and are not intended to limit the protection scope of the present invention.

Please refer to FIG. 1 and FIG. 2 , which are schematic circuit diagrams of an LED lamp 100 according to an embodiment of the present invention. The LED lamp 100 includes at least one set of LED lamp modules 10 connected in parallel with each other, a current detection module 11 electrically connected to one of the at least one set of LED lamp modules 10, and a current detection module 11 connected to the The current detection module 11 is electrically connected to the control module 12 . Of course, it is conceivable that the LED lamp 100 also includes a power supply for providing power thereto, and the switches, plugs, sockets and the like are well known to those skilled in the art.

The LED lamp module 10 includes at least one group. In this embodiment, the LED lamp 100 includes multiple groups of LED lamp modules 10 . Each group of LED lamp modules 10 has the same structure, composition, and connection method, that is, they all include a resistor 101 and at least one LED lamp 102 connected in series with the resistor 101 . Only in each group of LED lamp modules 10 , the parameters of the resistor 101 and the LED lamp 102 can be the same or not. In this embodiment, in order to obtain the same brightness of the multiple groups of LED lamp modules 10, the resistance values of the resistors 101 are equal, and each LED lamp 102 in the multiple groups of LED lamp modules has the same Pressure drop gear. Here we need to further explain the voltage drop gear of the LED lamp. Due to the precision of the production process of LED lights, the parameters of each LED light will be slightly different, even if it is a product produced by the same production line, so that when the current flowing through the LED lights is equal, the load on each LED light The voltage across the LED lights will be different. Therefore, LED lamps with the same voltage range are called LED lamps with the same voltage drop range, such as LED lamps with a 2.6V-2.7V range. As shown in FIG. 2 , each LED lamp 102 is replaced by a diode. It is conceivable that each group or several groups of LED lamp modules 10 can become an independent lamp, and these independent lamps can be interconnected by plugging. In this embodiment, each independent lamp includes two sets of LED lamp modules 10 .

The current detection module 11 and the control module 12 are implemented by a DC/DC converter. The current detection module 11 is used to detect the current of the resistor 101 in a group of LED lamp modules 10 electrically connected with the current detection module 11 . The control module 12 is used to keep the current value flowing through the detected resistor of the current detection module 11 unchanged. The above functions and purposes are all accomplished by the DC/DC converter. The DC/DC converter is a well-known component described by those skilled in the art, and its structure and working principle will not be described in detail here. As we all know, a DC/DC converter includes multiple pins, such as IN pins, RS pins, and SW pins. The IN pin and the RS pin are respectively electrically connected to two ends of a resistor 101 in a group of LED lamp modules 10 electrically connected to the current detection module 11 to detect the current value flowing through the resistor 101 . The function of the control module 12 is to keep the detected current value of the resistor 101 unchanged. Specifically, in this embodiment, the control module 12 includes a MOS transistor (not shown) disposed inside the DC/DC converter. It is a technology well known to those skilled in the art that the DC/DC converter has a MOS transistor. The control module 12, that is, the DC/DC converter, adjusts the MOS transistor according to the current value of the resistor 101 in a group of LED lamp modules 10 electrically connected to the current detection module 11 detected by the current detection module 11. The switching frequency is such that the current flowing through the resistor 101 remains constant.

The LED lamp 100 further includes a diode D0 electrically connected between the IN pin and the SW pin of the DC/DC converter. The anode of the diode D0 is electrically connected to the SW pin of the DC/DC converter, and the cathode is electrically connected to the IN pin. The function of the diode is to discharge the following inductance L when the above-mentioned MOS tube is turned off, so that the diode, the inductance L, and the LED lamp module 10 form a loop, so that the inductance L is the The above-mentioned LED lamp module 10 provides power.

The LED lamp 100 also includes an inductor L electrically connected between the negative electrode of the LED lamp module 10 and the SW pin of the DC/DC converter. The function of the inductor L is that when the above-mentioned MOS tube is turned on, the power supply, the DC/DC converter, and the LED lighting module 10 form a loop, and the LED lighting module 10 starts to work and emit light, and at the same time, the inductor L Start charging. When the MOS tube is turned off, as mentioned above, the inductor L discharges to provide power for the LED lamp module 10 .

Compared with the prior art, since the current detection module 11 detects the current value of a resistor 101 of the group of LED lamp modules 10, and the control module 12 keeps the current flowing through the resistor 101 according to the magnitude of the current value The value size does not change. That is, in this embodiment, the IN pin and the RS pin of the DC/DC converter detect the current value on the resistor 101, and the DC/DC converter adjusts the switching frequency of the internal MOS tube according to the current value to make the current value The size remains the same. Since the size of the resistor 101 remains constant, the total resistance value does not change when the number of LED lamps 102 in a group of LED lamp modules 10 does not change, so that the load on a group of LED lamp modules 10 The voltage at both ends of each group of LED lamp modules 10 is also set in parallel, so that the voltage applied at both ends of each group of LED lamp modules 10 is also unchanged. Therefore, in the LED lamp 100 , only the current detection module 11 and the control module 12 , that is, the DC/DC converter, the diode D0 and the inductor L are provided in one group of LED lamp modules 10 . However, the DC/DC converter, the diode D0 and the inductor L may not be provided in the remaining LED lamp modules 10 , so as to reduce the cost. In addition, if the resistance value of the resistor 101 of each group of LED lamps and the voltage drop range of each LED lamp 102 are the same, the brightness of the multiple groups of LED lamp modules 10 will be consistent.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (8)

1. An LED lamp, characterized in that: the LED lamp comprises at least one set of LED lamp modules connected in parallel with each other, and a current detection device electrically connected to one of the at least one set of LED lamp modules module, and a control module electrically connected to the current detection module, each of the at least one set of LED lamp modules includes a resistor and at least one LED lamp connected in series with the resistor, and the current detection module It is used to detect the current of the resistors in a group of LED lamp modules electrically connected with the current detection module, and the control module is used to keep the current value of the resistors detected by the current detection module unchanged. 2. The LED lamp according to claim 1, wherein the current detection module and the control module are implemented by a DC/DC converter. 3. The LED lamp according to claim 2, wherein the DC/DC converter includes an IN pin and an RS pin, and the IN pin and the RS pin are respectively electrically connected to the current detection module The resistors in a group of LED lighting modules are electrically connected to detect the current value of the resistors. 4. The LED lamp according to claim 3, wherein the DC/DC converter includes a SW pin, and the LED lamp further includes a diode electrically connected between the IN pin and the SW pin . 5. The LED lamp according to claim 4, wherein the anode of the diode is electrically connected to the SW pin of the DC/DC converter, and the negative pole is electrically connected to the IN pin. 6. The LED lamp according to claim 4, wherein the LED lamp further comprises an inductor, and the inductor is electrically connected between the negative electrode of the LED lamp module and the SW pin. 7. The LED lamp according to claim 2, wherein the control module includes a MOS tube disposed inside the DC/DC converter, and the control module The current detection module is electrically connected to the current value of the resistors in a group of LED lamp modules to adjust the switching frequency of the MOS tube so that the current flowing through the resistors remains constant. 8. The LED lamp according to claim 1, wherein the LED lamp comprises multiple groups of LED lamp modules, the resistance values of the resistors in the multiple groups of LED lamp modules are equal, and the multiple groups of LED lamp modules Each LED lamp in the group has the same voltage drop level.