CN201688212U - LED lamp with anode and cathode reversely connected in parallel and then connected in series - Google Patents

Abstract

An LED lamp with reverse positive and negative poles connected in parallel and then in series refers to an LED lamp suitable for lighting. A circuit board is provided in the LED lamp, and one or more LED light-emitting units with reverse positive and negative poles connected in parallel are provided on the circuit board, and a plurality of LED light-emitting units are connected in series to form an LED light strip. After one or more LED light-emitting units in the LED light strip are connected to a current-limiting resistor, one or more LED light strips are connected to a filter capacitor and a rectifier with reverse positive and negative poles connected in parallel. Since the lamp has a simple structure and does not use electrolytic capacitors and active components, the failure rate is much lower than that of LED lamps using traditional switch-type drive circuits, achieving the advantages of high brightness, low operating current, simple structure, low cost, high circuit reliability and good overall efficiency.

Description

An LED lamp with positive and negative poles reversed in parallel and then connected in series

technical field

The utility model belongs to an LED lamp, in particular to an LED lamp in which positive and negative poles are reversely connected in parallel and then connected in series.

Background technique

Lamps made of LEDs have the advantages of low power consumption, low heat generation, and long service life, and have been widely used in various fields. Because the drive circuit of the traditional LED tube or light bulb uses electrolytic capacitors and active components, although the efficiency and output current are stable, the life of the existing LED drive circuit is far less than that of the LED lamp. Often the LED lamp has not been damaged, and the drive circuit has Die early. In order to prolong the life of the LED lamp, the life of the driving circuit needs to be strengthened.

Technical solutions

The purpose of the present utility model is to provide a lamp tube or a light bulb with a service life equivalent to that of an LED in view of the above-mentioned existing problems. In order to achieve the above object, the utility model is realized by the following technical solutions:

An LED lamp with positive and negative poles connected in parallel and connected in series, mainly composed of diodes, non-polar capacitors, resistors, one or several LED light-emitting units with positive and negative poles connected in parallel and reversed, and multiple LED light-emitting units in series composed of LED strips. Its structure is: on the circuit board, one or several LED light-emitting units connected in parallel by positive and negative poles are arranged, and a plurality of LED light-emitting units are connected in series to form an LED light bar, and one or several LED light-emitting units in the LED light bar After the light-emitting unit is connected with a current-limiting resistor, connect one or several LED strips to the power supply; the LED light-emitting unit uses two LEDs connected in parallel and reversed, which can offset the surge at the moment of startup and the moment of shutdown. Reverse the voltage to prevent the LED chip from being broken down and achieve the purpose of lighting.

There are two driving methods: 1. When the frequency of the input power is less than 60Hz, two diodes connected in parallel with positive and negative poles and a non-polar capacitor form a double half-wave rectification module, and the input terminal of the double half-wave rectification module is directly connected to the mains Connect, the output terminal is connected in series with the current limiting resistor and then connected to the above light bar. 2. When the frequency of the input power is greater than 50Hz, the input terminal of the power supply is directly connected to the mains, and after being connected in series with the current limiting resistor, it is then connected to the above light bar.

The beneficial effects of the utility model are: the structure of the utility model is simplified, no electrolytic capacitors and active components are used, so the failure rate is far lower than that of the LED lamp using the traditional switch drive circuit, high brightness, small working current, simple structure, It has the advantages of low cost, high circuit reliability and good overall benefit.

Description of drawings

Fig. 1 is the circuit diagram of embodiment one of the utility model;

Fig. 2 is the schematic diagram of embodiment one of the utility model;

Fig. 3 is the circuit diagram of embodiment two of the utility model;

Fig. 4 is a schematic diagram of Embodiment 2 of the present utility model.

Detailed ways

The utility model will be further described below in conjunction with accompanying drawing:

If the frequency of the input power is less than 60Hz (please refer to Figure 1), the structure is composed of diodes D1, D2, non-polar capacitor C1, current limiting resistor Ra, and one or several LED light-emitting units with positive and negative parallel connections and reverse connections (such as : the connection combination of LED1a and LED2a); a plurality of LED light-emitting units in series are composed of LED light bars, such as: a light-emitting unit composed of LEDw-2 and LEDw-1 and a light-emitting unit composed of LEDw and LEDw+1 LED w strings connected in series; LED y strings composed of LEDy-2 and LEDy-1 light-emitting units and LEDy and LEDy+1 light-emitting units connected in series; LEDz-2 and LEDz-1 The light-emitting unit composed of LEDz and LEDz+1 is connected in series to form an LED z string. The specific method is: a double half-wave rectification module formed by two diodes D1 and D2 connected in parallel and reversed with positive and negative poles and a non-polar capacitor C1, and one or several LED light-emitting units with parallel and reversed positive and negative poles (such as: The connection combination of LED1a and LED2a); the LED light bar composed of multiple LED light-emitting units in series, such as: the light-emitting unit composed of LEDw-2 and LEDw-1 is connected in series with the light-emitting unit composed of LEDw and LEDw+1 The LED w string composed together; the LED y string composed of the light-emitting unit composed of LEDy-2 and LEDy-1 and the light-emitting unit composed of LEDy and LEDy+1 connected in series; the LED y string composed of LEDz-2 and LEDz-1 The light-emitting unit and the light-emitting unit composed of LEDz and LEDz+1 are connected in series to form an LED z string. After connecting the LED strips to the current limiting resistors (such as: Ra, Rb, Rx), then connect one or several LED strips to the filter capacitor C1 and the double half-wave rectifier. Among them, the LED light-emitting unit adopts two LED positive and negative poles connected in parallel and reversed (such as: the connection combination of LED1a and LED2a), which can offset each other's surge at the moment of power-on and reverse voltage at the moment of power-off, and can prevent the LED chip from being broken down. And to achieve the purpose of lighting.

Its working principle is as follows (Please refer to Figure 2): After the power is turned on, the positive half cycle of the AC current charges the capacitor C1 through the diode D1, and then discharges the odd-numbered forward LEDs. At this time, all the odd-numbered forward LEDs will be lit. Bright. Then the negative half cycle of the alternating current charges the capacitor C1 through the diode D2, and then discharges the even-numbered reverse LEDs, and at this time all the even-numbered reverse LEDs will be lit. Due to the discharge cycle of the capacitor C1 and the persistence of vision, the eyes cannot see this alternating process.

If the frequency of the input power is greater than 50Hz (please refer to Figure 3), the structure is to connect the positive and negative poles of two LEDs in reverse parallel to form a light-emitting unit (such as: the connection combination of LED1a and LED2a), and multiple LED light-emitting units are connected in series Form LED light bar (for example: LED w string composed of LEDw-2 and LEDw-1 and LEDw and LEDw+1 connected in series; LEDy-2 and LEDy-1 composed of light-emitting The LED y string composed of the unit and the light-emitting unit composed of LEDy and LEDy+1 connected in series; the LED composed of the light-emitting unit composed of LEDz-2 and LEDz-1 connected in series with the light-emitting unit composed of LEDz and LEDz+1 z string), one or several LED light strips are connected to current limiting resistors (such as: Ra, Rb, Rx), and then one or several LED light strips are connected to the power supply.

Its working principle is as follows (Please refer to Figure 4): After the power is turned on, the positive half cycle of the AC passes through the odd-numbered forward LEDs (such as: LED1a), and all the odd-numbered forward LEDs will be lit at this time. Then the negative half cycle of the alternating current passes through the even-numbered reverse LEDs (such as: LED2a), and at this time the even-numbered reverse LEDs will all be lit. Due to the persistence of vision, the eyes cannot see this alternating process.

Since the structure of this creation is simplified and does not use electrolytic capacitors and active components, the failure rate is much lower than that of traditional switching drive circuits. Moreover, because no resistance-capacitance step-down circuit is used, after actual measurement: the power supply power compensation factor PF value can reach more than 0.9, so the utility model has high brightness, small working current, simplified structure, low cost, high circuit reliability and overall benefits Good and other advantages.

The framework of this creation can increase or decrease the number of LED strings or columns depending on the requirements of lighting brightness and the status of power supply voltage. The above examples are for further describing the principles of the utility model, and changes based on the same principles described in the utility model all fall within the scope of the claims.

Claims (4)

1. A kind of LED lamp that the positive and negative poles are reversely connected in parallel and then connected in series, including diodes, capacitors and resistors, characterized in that one or several LED light emitting units connected in parallel by positive and negative poles are arranged on the circuit board, Multiple LED light-emitting units are connected in series to form an LED light bar. After one or several LED light-emitting units in the LED light bar are connected to a current limiting resistor, one or several LED light bars are connected to the power supply. 2. An LED lamp with positive and negative polarities reversed in parallel and then connected in series according to claim 1, characterized in that two half-wave rectification modules are composed of two diodes connected in parallel with positive and negative polarities reversed and a non-polar capacitor . 3. The LED lamp with positive and negative polarities reversed in parallel and then connected in series according to claim 1, characterized in that: the input end of the double half-wave rectification module is directly connected to the mains, and the output end is connected in series with the current limiting resistor. Then connect with the LED light bar. 4. An LED lamp with positive and negative polarities reversed in parallel and then connected in series according to claim 1, characterized in that: the input terminal can be directly connected to the mains, and the mains is connected in series with the current limiting resistor, and then connected to the The LED strips are connected.

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