CN212588559U

CN212588559U - Double-end LED fluorescent tube of self-adaptation high low frequency

Info

Publication number: CN212588559U
Application number: CN202020982041.6U
Authority: CN
Inventors: 苏剑华
Original assignee: Lingguang Lighting Technology Shanghai Co ltd
Current assignee: Lingguang Lighting Technology Shanghai Co ltd
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2021-02-23
Anticipated expiration: 2030-06-02

Abstract

The utility model discloses a bi-polar LED fluorescent tube of self-adaptation high low frequency, including the light source board, the light source board outside is equipped with the lamp sleeve pipe, lamp sleeve pipe both ends are equipped with the lamp holder, are equipped with low frequency drive and high frequency drive in the lamp holder at lamp sleeve pipe both ends respectively, low frequency drive and high frequency drive link to each other through the input of temperature fuse with the lamp holder. Above-mentioned technical scheme is during operation under the high frequency commercial power, the original fluorescent lamp fluorescent tube of LED fluorescent tube direct replacement, need not to change fluorescent lamp lamps and lanterns inside, if mismatch with the high frequency electronic ballast in the fluorescent lamp lamps and lanterns, directly cut off original high frequency electronic ballast and insert the fluorescent tube both ends with the commercial power, can normally work and reduced the loss of electronic ballast itself, the LED fluorescent tube is under the frequency of difference, automatic selection circuit work operation, and easy operation has saved user's time and cost greatly.

Description

Double-end LED fluorescent tube of self-adaptation high low frequency

Technical Field

The utility model relates to a LED lighting technology field especially relates to a bi-polar LED fluorescent tube of self-adaptation high low frequency.

Background

Data shows that the fluorescent lamp is the most common lighting tool for offices and residences, and the traditional fluorescent lamp generally adopts a fluorescent lamp tube, and the fluorescent lamp tube is gradually replaced by the LED lamp tube along with the continuous maturity of the LED technology due to the advantages of energy conservation, environmental protection and the like of the LED. Because the existing fluorescent lamp is often provided with a ballast, the output current of the existing fluorescent lamp is alternating current, and the LED needs direct current driving, the existing lamp line needs to be modified, and replacement can be realized.

At present, two types of high-frequency replacement lamps and direct-incoming commercial lamp lamps exist in the market and respectively occupy certain market share, however, the problem is that the inventory is overstocked, a client needs a professional electrician to select installation, the time and the cost are wasted, and the risk of returning goods due to unmatched operation exists.

Chinese patent document CN106793265B discloses an "LED driving circuit and an LED lamp tube". The utility model provides an including PWM the control unit and the rectifying unit, filtering unit, first switch element, energy storage afterflow unit and the secondary filtering unit that connect gradually, PWM the control unit passes through the sampling unit and samples from the output, controls repeated disconnection of first switch element and switch-on, and when first switch element disconnection, energy storage afterflow unit discharges to the load, still includes detecting element and second switch element, second switch element connects first switch element and energy storage afterflow unit, alternating current power supply is connected to the detecting element input, and PWM the control unit and second switch element are connected to the output for detect input current's frequency, and output signal control first switch element and second switch element disconnection or switch-on. The technical scheme solves the problem that extra parts are needed for load reduction, and the product cost and the complexity are increased.

Disclosure of Invention

The utility model discloses mainly solve original LED fluorescent tube replacement fluorescent tube complex technical problem of operation, the utility model provides a bi-polar LED fluorescent tube of self-adaptation high low frequency, the during operation under high frequency commercial power, the original fluorescent tube of LED fluorescent tube direct replacement, need not to change fluorescent lamp lamps and lanterns inside, if mismatch with the interior high frequency electronic ballast of fluorescent lamp lamps and lanterns, directly cut off original high frequency electronic ballast and insert the fluorescent tube both ends with the commercial power, can normally work and reduced the loss of electronic ballast itself, the LED fluorescent tube is under the frequency of difference, the automatic selection circuit work operation, moreover, the steam generator is simple in operation, user's time and cost have been saved greatly.

The above technical problem of the present invention can be solved by the following technical solutions: the utility model discloses a light source board, the light source board outside is equipped with the lamp sleeve pipe, lamp sleeve pipe both ends are equipped with the lamp holder, are equipped with low frequency drive and high frequency drive in the lamp holder at lamp sleeve pipe both ends respectively, low frequency drive and high frequency drive link to each other through the input of temperature fuse with the lamp holder. Two sets of independent low-frequency drive and high-frequency drive which are respectively arranged in lamp caps at two ends automatically select the circuit to work and operate under the condition of judging different access frequencies, and the two sets of circuits completely and independently work, so that the lamp is safe and reliable. The temperature fuse is used for avoiding the damage of the lamp and the lamp tube caused by overhigh temperature and ensuring the normal work of the LED lamp.

Preferably, the low-frequency driving circuit comprises a rectifier bridge, one path of the direct-current positive output end of the rectifier bridge is sequentially connected with the voltage-dividing capacitor C, the internal resistance R and the direct-current negative electrode of the rectifier bridge, the other path of the direct-current positive output end of the rectifier bridge is connected with the logic detection judging switch, the logic detection judging switch is respectively connected with the voltage-dividing capacitor C, the internal resistance R and the positive input end of the constant-current circuit, the negative input end of the constant-current circuit is connected with the direct-current negative electrode of the rectifier bridge, and two ends of the constant-current positive output end and the constant-.

Preferably, the high-frequency driving circuit comprises a high-frequency rectifier bridge, the positive output end of the high-frequency rectifier bridge is connected with the LED load through a trigger IC, and the negative output end of the high-frequency rectifier bridge is connected with the LED load. The trigger IC is used for judging the commercial power frequency to determine whether the high-frequency driving circuit works or not.

Preferably, a reverse current prevention diode is arranged on a connecting circuit of the constant current positive output end of the constant current circuit and the LED load. An anti-reverse diode is connected in the load for preventing current reverse string, and the anti-reverse diode is matched with the trigger IC to separate high-frequency and low-frequency operation modes.

Preferably, one alternating current input end of the rectifier bridge is connected with the live wire L through a fuse, and the other alternating current input end of the rectifier bridge is connected with the zero line N. When the lamp tube is connected with low-frequency mains supply, the trigger IC in the high-frequency circuit is in an open circuit state and cannot work, and the low-frequency circuit works at the moment.

Preferably, the low-frequency drive and the high-frequency drive are connected in parallel, one end of the high-frequency rectifier bridge is connected with the live wire L through a current-limiting capacitor, and the other alternating current input end of the high-frequency rectifier bridge is connected with the zero line N. The high-low frequency circuit is two sets of circuits which independently run, and when the high-frequency electronic ballast works, the principle of short circuit priority is utilized. At the moment, the high-frequency circuit works firstly, when the high-frequency circuit works, the low-frequency circuit is short-circuited by the high-frequency circuit, the low-frequency circuit does not work, and therefore the low-frequency circuit does not participate in working but is safely protected when being connected with high-frequency mains supply.

Preferably, the constant current circuit comprises three modes of BUCK, BUCK-BOOST and BOOST. And the BUCK or BUCKBOOST or BOOST circuit of the constant current circuit is used for controlling the output voltage of the LED load.

Preferably, the lamp sleeve is a PC tube or a glass tube. The PC pipe or the glass pipe has good light transmittance, and meanwhile, compared with the glass pipe, the PC pipe has higher strength and is not easy to damage.

The utility model has the advantages that:

1. when the fluorescent lamp works under high-frequency commercial power, the product can directly replace the original fluorescent lamp tube without changing the interior of the fluorescent lamp.

2. If the product is not matched with the high-frequency electronic ballast in the fluorescent lamp, the original high-frequency electronic ballast is directly cut off and the commercial power is connected to the two ends of the lamp tube to realize normal work, so that the loss of the electronic ballast is reduced.

And 3, the LED lamp tube automatically selects the circuit to work and operate under different frequencies, so that the operation is simple, and the time and the cost of a user are greatly saved.

4. The low-frequency drive and the high-frequency drive work completely and independently, and are safe and reliable.

Drawings

Fig. 1 is a block diagram of a circuit principle connection structure of the present invention.

Fig. 2 is an exploded view of the present invention.

Fig. 3 is a schematic circuit diagram of the present invention.

In the figure, 1 lamp holder, 2 temperature fuses, 3 low-frequency driving, 3.1 rectifier bridge direct current positive pole, 3.2 logic detection judgment switch, 3.3 constant current circuit, 3.4 rectifier bridge direct current negative pole, 4 high-frequency driving, 4.1 high-frequency rectifier bridge positive pole, 4.2 trigger IC, 4.3LED load, 4.1 high-frequency rectifier bridge negative pole, 5 light source plates and 6 lamp sleeves.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.

Example (b): fig. 2 shows that the adaptive high-low frequency double-ended LED lamp tube of the present embodiment includes a lamp sleeve 6, where the lamp sleeve 6 is a PC tube or a glass tube. The PC pipe or the glass pipe has good light transmittance, and meanwhile, compared with the glass pipe, the PC pipe has higher strength and is not easy to damage. The lamp sleeve 6 is provided with lamp holders 1 at two ends, a light source plate 5 is arranged inside the lamp sleeve 6, and a low-frequency driver 3 and a high-frequency driver 4 are respectively arranged in the lamp holders 1 at two ends of the lamp sleeve 6. The low frequency drive 3 and the high frequency drive 4 are connected to the input of the lamp cap 1 via a thermal fuse 2. Two sets of independent low-frequency drive and high-frequency drive which are respectively arranged in lamp caps at two ends automatically select the circuit to work and operate under the condition of judging different access frequencies, and the two sets of circuits completely and independently work, so that the lamp is safe and reliable.

As shown in fig. 1, the circuit of the low frequency drive 3 includes a rectifier bridge, one ac input end of which is connected to the live line L through a fuse, and the other ac input end of which is connected to the neutral line N. One path of the output end of a direct current positive electrode 3.1 of the rectifier bridge is sequentially connected with a voltage-dividing capacitor C, an internal resistance R and a direct current negative electrode 3.4 of the rectifier bridge, the other path of the output end of the direct current positive electrode is connected with a logic detection judging switch 3.2, the logic detection judging switch 3.2 is respectively connected with the voltage-dividing capacitor C, the internal resistance R and the positive electrode input end of a constant current circuit 3.3, the negative electrode input end of the constant current circuit 3.3 is connected with the direct current negative electrode 3.4 of the rectifier bridge, and two ends of the constant current positive electrode output end and the constant current negative electrode output end of. And a reverse current prevention diode is arranged on a connecting circuit of the constant current positive output end of the constant current circuit 3.3 and the LED load 4.3, the reverse current prevention diode is connected into the load to prevent current from reversely stringing, and the reverse current prevention diode is matched with the trigger IC to separate high-frequency and low-frequency working modes. The constant current circuit 3.3 comprises three modes of BUCK, BUCK-BOOST and BOOST, and the BUCK or BUCKBOOST or BOOST circuit of the constant current circuit is used for controlling the output voltage of the LED load.

The low-frequency drive 3 is connected with the high-frequency drive 4 in parallel, the circuit of the high-frequency drive 4 comprises a high-frequency rectifier bridge, one end of the high-frequency rectifier bridge is connected with a live wire L through a current-limiting capacitor, and the other alternating current input end of the high-frequency rectifier bridge is connected with a zero line N. The positive output end 4.1 of the high-frequency rectifier bridge is connected with an LED load 4.3 through a trigger IC4.2, and the trigger IC is used for judging the commercial power frequency to determine whether a high-frequency driving circuit works or not. And the cathode output end 4.4 of the high-frequency rectifier bridge is connected with an LED load 4.3.

As shown in fig. 3, when the high-frequency driver 4 operates, the high-frequency rectifier bridge positive output terminal 4.1 on the light source board 5 passes through the trigger IC4.2, then passes through the diode Da1, the diode Db1 …, the diode Dan and the diode Dbn to form two parallel circuits, and then passes through the diode D3, then passes through the diode Dcn, the diode Den …, the diode Dc1, the diode De1 and the diode D6 to return to the high-frequency rectifier bridge negative output terminal 4.4, so as to form a module with two parallel circuits connected in series in sequence; when the low-frequency drive 3 works, a constant-current positive output end on the light source board 5 passes through a diode D1, then passes through diodes Da1 and Da2 … diode Dan, then passes through a diode D4, then passes through a diode D1, then passes through diodes Db1 and Db2 … diode Dbn, then passes through a diode D4, then passes through a diode D2, then passes through diodes Dc1 and Dc2 … diode Dcn, then passes through a diode D5, then passes through a diode D2, then passes through diodes De1 and De2 … diode Den, then passes through a diode D5, then passes through four series circuits, and finally, the four series circuits are connected in parallel to form a parallel circuit module. The diode can be replaced by other transistors such as a triode, a MOS tube and the like.

LED load voltage drop is high during high frequency work, LED load voltage is low during low frequency work, output voltage can be controlled through switching power supply BUCK or BUCKBOOST or BOOST circuit during low frequency work, namely LED load voltage drop, then utilize LED cluster parallel connection mode to solve load voltage drop, and cut in the load and prevent the transistor of electric current anti-cluster and trigger IC and separate high low frequency operating mode, LED lamp pearl is full series connection state during high frequency work, LED lamp pearl then connects in parallel half when low frequency work, the voltage drop is exactly half of series connection.

When the high-frequency electronic ballast works, the high-frequency circuit and the low-frequency circuit are two sets of circuits which independently run, and when the high-frequency electronic ballast works on the high-frequency electronic ballast, the principle of priority of short circuit is utilized. At the moment, the high-frequency circuit works firstly, when the high-frequency circuit works, the low-frequency circuit is short-circuited by the high-frequency circuit, the low-frequency circuit does not work, and therefore the low-frequency circuit does not participate in working but is safely protected when being connected with high-frequency mains supply. Since the low frequency circuit has a VCC circuit for each power supply BUCK or BUCK BOOST or IC in the BOOST circuit, which has a start-up procedure anyway, this circuit must be slower than the high frequency circuit. When the lamp tube is connected to the low-frequency commercial power, the trigger IC in the high-frequency circuit can be a diode, a triode, an MOS tube, a discharge tube, an IC and the like, and can not work when being in an open circuit state, and the low-frequency circuit works at the moment.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the terms driver, diode, rectifier bridge, constant current circuit, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The self-adaptive high-low-frequency double-end LED lamp tube is characterized by comprising a light source plate (5), a lamp sleeve (6) is arranged outside the light source plate (5), lamp caps (1) are arranged at two ends of the lamp sleeve (6), a low-frequency drive (3) and a high-frequency drive (4) are respectively arranged in the lamp caps (1) at two ends of the lamp sleeve (6), and the low-frequency drive (3) and the high-frequency drive (4) are connected with the input end of the lamp caps (1) through a temperature fuse (2).

2. The self-adaptive high-low frequency double-end LED lamp tube is characterized in that a circuit of the low-frequency driver (3) comprises a rectifier bridge, one path of an output end of a direct current positive electrode (3.1) of the rectifier bridge is sequentially connected with a voltage-dividing capacitor C, an internal resistance R and a direct current negative electrode (3.4) of the rectifier bridge, the other path of the output end of the direct current positive electrode of the rectifier bridge is connected with a logic detection judging switch (3.2), the logic detection judging switch (3.2) is respectively connected with the voltage-dividing capacitor C, the internal resistance R and a positive electrode input end of a constant current circuit (3.3), a negative electrode input end of the constant current circuit (3.3) is connected with the direct current negative electrode (3.4) of the rectifier bridge, and two ends of a constant current positive electrode output end and a constant current negative electrode output end of the constant current circuit (3.

3. A self-adaptive high-low frequency double-ended LED lamp tube according to claim 1, wherein the circuit of the high frequency driver (4) comprises a high frequency rectifier bridge, the positive output terminal (4.1) of the high frequency rectifier bridge is connected to the LED load (4.3) through a trigger IC (4.2), and the negative output terminal (4.4) of the high frequency rectifier bridge is connected to the LED load (4.3).

4. The adaptive high-low frequency double-ended LED lamp tube according to claim 2, wherein a reverse-current prevention diode is arranged on a connecting circuit of a constant current positive output end of the constant current circuit (3.3) and the LED load (4.3).

5. The adaptive high and low frequency double-ended LED lamp tube according to claim 2, wherein one AC input end of the rectifier bridge is connected to the live line L through a fuse, and the other AC input end of the rectifier bridge is connected to the neutral line N.

6. A self-adaptive high-low frequency double-ended LED lamp tube according to claim 3, characterized in that the low frequency driver (3) and the high frequency driver (4) are connected in parallel, one end of the high frequency rectifier bridge is connected with the live line L through a current-limiting capacitor, and the other AC input end of the high frequency rectifier bridge is connected with the neutral line N.

7. The adaptive high-low frequency double-ended LED lamp tube according to claim 2, wherein the constant current circuit comprises three modes, i.e. BUCK, BUCK-BOOST and BOOST.

8. An adaptive high and low frequency double ended LED lamp tube as claimed in claim 1, characterized in that said lamp sleeve (6) is a PC tube or a glass tube.