CN222016818U - LED lamp compatible power supply - Google Patents

Abstract

The utility model provides a compatible power supply of an LED lamp tube, which comprises the following components: the compatible power supply further comprises a lamp tube output terminal used for being connected with the input end of the driving circuit of the LED lamp tube; the compatible power supply further includes: the electronic ballast comprises an electronic ballast power control circuit, a PWM power supply constant current circuit, a leakage current prevention circuit and a first rectifying circuit. Due to the adoption of the technical scheme, the fluorescent lamp bracket can be used for a novel ballastless bracket without dismantling the original traditional fluorescent lamp bracket, is convenient for users to use, and is energy-saving and environment-friendly.

Description

LED lamp tube compatible power supply

Technical Field

The utility model relates to the field of LED lamp tubes, in particular to a compatible power supply for an LED lamp tube.

Background

With the development and popularization of the LED lighting technology, LEDs have advantages of high luminous efficiency, long service life, high quality and light efficiency, and various LED lighting products such as LED fluorescent lamps, LED bulb lamps, LED panel lamps, and LED down lamps have appeared in recent years. The LED energy-saving lamp product has a very broad market prospect due to the increasing importance of energy-saving and environment-friendly LED products in various countries in the world.

The electronic ballast driven LED lighting is being discussed, for example, patent utility model 201220182562.9 discloses an electronic ballast driven LED conversion module. The module utilizes the electric energy obtained after the high-frequency high-voltage power supply output by the electronic ballast is directly subjected to current-limiting, rectifying, filtering and voltage stabilization to drive the LED. Because the single-ended input AC power supply cannot be compatible, the safe leakage current requirement cannot be met in the installation and use process, the current limiting and triode voltage stabilizing modes are utilized, and the output power and the energy saving effect are required to be improved.

The early fluorescent tube is provided with a coil ballast and a neon bulb starter, and the coil ballast generates pulse high voltage by utilizing the electrifying and heating on-off process of the neon bulb starter, so that the fluorescent tube is lightened. Due to high power consumption and advances in electronics, coil ballasts have been gradually replaced by electronic ballasts. Conventional fluorescent tubes have been installed for use in many households and are equipped with a fixed bracket having a coil ballast or an electronic ballast. At present, because the output of the electronic ballast is in modes of high frequency, high voltage, constant current or constant power and the like, the common LED fluorescent lamp driving power supply cannot adapt to the output characteristics of the electronic ballast, the electronic ballast must be dismantled from the original fluorescent lamp fixing bracket, the electronic ballast is converted to pass through AC (alternating current) and then the electronic ballast can be used, and the converted fluorescent lamp bracket cannot directly use the common fluorescent lamp. Meanwhile, some users are refitted with the LED fluorescent lamp with single-end or double-end power input, so that great trouble is brought to the installation of common users, and the common users cannot install the common users by themselves.

Disclosure of utility model

The utility model provides a compatible power supply for an LED lamp tube, which aims to solve at least one technical problem.

In order to solve the above problems, as one aspect of the present utility model, there is provided an LED lamp compatible power supply, comprising: the compatible power supply further comprises a lamp tube output terminal used for being connected with the input end of the driving circuit of the LED lamp tube;

The compatible power supply further includes: the electronic ballast comprises an electronic ballast power control circuit, a PWM power supply constant current circuit, a leakage current prevention circuit and a first rectifying circuit;

the first input terminal and the second input terminal are both connected with the input end of the electronic ballast power control circuit, and the output end of the electronic ballast power control circuit is electrically connected with the control end of the leakage current prevention circuit;

the third input terminal and the fourth input terminal are connected with the lamp tube output terminal through the PWM power supply constant current circuit;

The leakage current prevention circuit includes a first circuit for communicating the first input terminal with a second input terminal and a second circuit for connecting with the lamp output terminal through the first rectifying circuit.

Preferably, the electronic ballast power control circuit comprises: the first input terminal and the second input terminal are connected with the input end of the rectifying element, the output end of the rectifying element is electrically connected with the control end of the leakage current prevention circuit.

Preferably, the first circuit comprises a first relay, the second circuit comprises a second relay, and the output end of the rectifying element is connected with the control ends of the first relay and the second relay respectively.

Preferably, the voltage stabilizing circuit includes: the voltage stabilizing tube and the complementary bias resistor are arranged in parallel and are internally provided with transistors.

Preferably, the first input terminal is connected to an input of the electronic ballast power control circuit through a first transformer.

Preferably, the first transformer is a non-isolated transformer.

Preferably, the inductance of the non-isolated transformer is 100-300uH.

Preferably, the PWM power supply constant current circuit comprises an LED constant current chip and a stroboscopic removing chip, and the third input terminal and the fourth input terminal are sequentially connected with the lamp tube output terminal through the LED constant current chip and the stroboscopic removing chip.

Preferably, the third input terminal and the fourth input terminal are connected with the LED constant current chip through a rectifier bridge.

Due to the adoption of the technical scheme, the fluorescent lamp bracket can be used for a novel ballastless bracket without dismantling the original traditional fluorescent lamp bracket, is convenient for users to use, and is energy-saving and environment-friendly.

Drawings

FIG. 1 schematically illustrates a schematic circuit diagram associated with a leakage current prevention circuit;

fig. 2 schematically shows a schematic circuit diagram of a PWM power supply related to a constant current circuit;

fig. 3 schematically shows a circuit schematic of an electronic ballast power control circuit.

Detailed Description

The following describes embodiments of the utility model in detail, but the utility model may be practiced in a variety of different ways, as defined and covered by the claims.

As one aspect of the present utility model, there is provided a LED lamp tube compatible power supply, in particular, a novel LED fluorescent lamp tube power supply compatible with 90% electronic ballast and ac power supply, comprising: the compatible power supply further comprises a lamp tube output terminal LED+/LED < - > which is used for being connected with the input end of the driving circuit of the LED lamp tube;

The compatible power supply further includes: the electronic ballast comprises an electronic ballast power control circuit, a PWM power supply constant current circuit, a leakage current prevention circuit and a first rectifying circuit; the electronic ballast power control circuit and the like belong to the prior art, for example, reference is made to 201821545716.X, and no further description is given here.

The first input terminal P1 and the second input terminal P2 are both connected with the input end of the electronic ballast power control circuit, and the output end of the electronic ballast power control circuit is electrically connected with the control end of the leakage current prevention circuit;

The third input terminal P3 and the fourth input terminal P4 are connected with the lamp tube output terminal LED + \LED-through the PWM power supply constant current circuit;

the leakage current prevention circuit comprises a first circuit for enabling the first input terminal P1 to be communicated with the second input terminal P2 and a second circuit for being connected with the lamp tube output terminal LED++ LED-through the first rectifying circuit.

Preferably, the electronic ballast power control circuit comprises: the rectifying device comprises a rectifying element U4 and a voltage stabilizing circuit connected with the output end of the rectifying element U4, wherein the first input terminal P1 and the second input terminal P2 are both connected with the input end of the rectifying element U4, and the output end of the rectifying element U4 is electrically connected with the control end of the leakage current preventing circuit. For example, U4 may employ BAV756DW or the like.

Preferably, the first circuit includes a first relay RL2, the second circuit includes a second relay RL1, and the output end of the rectifying element U4 is connected to the control ends of the first relay RL2 and the second relay RL1, respectively. The leakage prevention is mainly completed by the first relay RL2, and the relay and the Y1 type safety capacitor (CY 1) are utilized for isolating electricity, so that the safety regulation authentication requirement is met.

Preferably, the voltage stabilizing circuit includes: the voltage stabilizing tube D12 and the complementary bias resistor built-in transistor U3 are arranged in parallel. For example, U3 may employ UMD3N or the like. The starting stage is to provide a control signal with higher voltage for the control end of the leakage current prevention circuit under the action of the voltage stabilizing tube D12; the complementary bias resistor built-in transistor U3 is then used to provide a lower voltage control signal to the control terminal of the leakage current prevention circuit. Therefore, after the relay is attracted, a lower control signal can be adopted to maintain the relay in an attracted state, so that heating and power are reduced.

Preferably, the first input terminal P1 is connected to an input of the electronic ballast power control circuit via a first transformer T2. Preferably, the first transformer T2 is a non-isolated transformer. Preferably, the inductance of the non-isolated transformer is 100-300uH, and the non-isolated transformer within the parameter range is adopted, so that the non-isolated transformer can be suitable for most LED brackets or lamp holders on the market, and the LED lamp tube adopting the utility model can be normally used on most LED brackets or lamp holders.

Preferably, the PWM power supply constant current circuit comprises an LED constant current chip U1 and a stroboscopic removing chip U2, and the third input terminal P3 and the fourth input terminal P4 are connected with the lamp tube output terminal LED + \LED-sequentially through the LED constant current chip U1 and the stroboscopic removing chip U2. The LED constant current chip U1 can adopt Jie Huate to produce JW1969, adopts BUCK architecture principle, and is an efficient energy-saving lamplight constant current chip; the stroboscopic removing chip U2 can adopt SY5862, and peripheral devices C12, D2, C4, D3 and C5 form a high-efficiency lamplight stroboscopic-free stable and reliable circuit.

The LED constant current chip U1, the stroboscopic removing chip U2, the complementary bias resistor built-in transistor U3 and the rectifying element U4 all have over-temperature protection function control, the temperature exceeds 150 ℃, the power supply stops working or is in a hiccup mode working, and when the temperature is reduced, the normal working mode is automatically restored

Preferably, the third input terminal P3 and the fourth input terminal P4 are connected to the LED constant current chip U1 through a rectifier bridge BD 1.

The utility model is used as a compatible electronic ballast LED fluorescent lamp power supply meeting the safety certification requirement, and is arranged in an LED lamp tube, wherein F1 and F3 are safety fuses for preventing the input current from being overlarge. The working principle and process of the present utility model will be described in detail with reference to the schematic circuit diagrams shown in fig. 1 to 3.

The input terminals include two AC power input terminals (a third input terminal P3 (input terminal L), a fourth input terminal P4 (input terminal N)), and two electronic ballast input terminals (a first input terminal P1, a second input terminal P2). The input ends of the two AC power supplies and the input end of the electronic ballast are respectively connected to 4 pins at two ends of the LED fluorescent tube, and the output ends of the two AC power supplies and the input ends of the electronic ballast are connected to a driving lamp panel of the LED fluorescent tube.

When the lamp of the present utility model is mounted to a rack for AC only AC power, the lamp is single ended L, N. When the lamp tube is used as a substitute for a traditional fluorescent lamp and is installed on a traditional fluorescent lamp bracket, the contacts on the bracket are respectively connected into L, N, P four wires (P1 and P2). L and N are connected on the input side of the bridge rectifier circuit (BD 1), L and N are connected with the shunt resistor VR1 (7D 511), and the first input terminal P1 and the second input terminal P2 are connected with the electronic ballast power control circuit.

The lightning-protection surge high-voltage circuit is composed of F1, VR2 and F1 insurance resistors, VR1 and VR2 are piezoresistor components conforming to a voltage safety rule, and the input end attenuates a part of surge high voltage through the insurance resistors and then fully absorbs the surge high voltage through piezoresistors placed in front of and behind a bridge pile BD 1.

CX1, CX2, C1, L2, L4, R20, R22, C6 and C2/C8 in the circuit form an EMC countermeasure circuit, CX2 and C1, L2, L4, R20 and R22 are filter circuits at the scale, and the filter circuits mainly aim at meeting the conduction interference countermeasure device, and C6 and C2/C8 are high-frequency noise leakage devices and mainly meet the radiation interference countermeasure device.

The electronic ballast power control circuit is matched with T2 power (non-isolated), most of electronic ballast outputs from a bracket are high-frequency alternating-frequency signals, the electronic ballast outputs are provided with capacitors in series, T2 is added, T2 has inductance L characteristics, LC series oscillation can be realized with the electronic ballast, the working state of the electronic ballast is maintained, and the electronic ballast is matched with different electronic ballasts through actual measurement, and the parameters are 100-300uH. U3, U4 and peripheral circuits form a control assembly. When the utility model is powered and used by the electronic ballast in the external bracket, the function of RL1 can better simulate the traditional fluorescent lamp and realize compatibility with more electronic ballasts.

Therefore, when the contacts of the bracket provide AC power supply or electronic ballast power supply for the lamp tube, the lamp tube adopting the utility model can be used, thereby achieving the aim of compatibility.

When the AC power supply is carried out by the bracket, LN is used as the power supply access of the lamp tube, the LN is changed into direct-current high-voltage power after being rectified by BD1, and then U1, U2 and surrounding elements form a buck type constant current circuit to drive the LED to emit light and illuminate; when the utility model is powered by an electronic ballast or an inductive ballast on a bracket, U3 and U4 are judged by accessed ballast signals, RLVCC relays are generated to supply power, the two relays RL2 and RL1 are in a working state, an AC device is cut off, T2 ballasts constant power or constant current, the driven ballast enters a stable output working state, after the driven ballast is converted into an electronic ballast working mode, a D4/D8, D5/D9, D6/D10 and D7/D11 rectifier bridge component rectifies the output of the ballast, and the LED of a lamp tube is lightened to replace the original fluorescent lamp tube, thereby realizing illumination.

When AC power is supplied, an AC power supply L directly reaches the L input end of the LED compatible power supply through the inductive ballast; the AC power supply N is connected with an F3 fuse of the compatible power supply through P1, then is connected to a P2 end through an internal transformer, and the P2 end is short-circuited with the fuse through a starter and then reaches an N input interface to provide AC power for the compatible power supply. The power supply directly reaches the bridge rectifier diode to rectify into direct current, and the direct current is filtered by the capacitors CX2 and C1. CX2 and C1 are enabled to obtain a stable direct current power supply, and then U1 and U2 are used for constant current and strobe-free driving power supply for LEDs.

When the electronic ballast is powered, the electronic ballast outputs filament voltage and high-frequency high-voltage signals to L and N and P1 and P2 respectively, when the LED compatible power supply is connected to T2 and internal U3 and U4 through the input ends of L and N and P1 and P2, the integrated circuit can send out relay action voltage after recognizing that the signals of the electronic ballast are completely connected to the input ends of the LED compatible power supply, the double relays RL1 and RL2 are simultaneously attracted, normal working current of the electronic ballast can be coupled through electronic elements such as T2, the double relays and a power fuse, and finally reaches the bridge rectifier assembly D4/D8, D5/D9, D6/D10 and D7/D11 circuits, and the electronic ballast is powered to the LEDs after being filtered.

When AC alternating current is connected to an input end L and an input end N of an LED fluorescent lamp power supply compatible with the electronic ballast, the bridge rectifier circuit directly rectifies the AC alternating current into a direct current power supply, CX2 and C1 capacitors are used for filtering, so that the CX2 and C1 capacitors obtain a stable direct current power supply, and then the power supply conversion circuit supplies power to the LEDs for use.

The relays RL1 and RL2 are used for conducting double-end leakage current isolation of the LED compatible power supply, when the L and the N of the LED compatible power supply are connected with AC alternating current, and the P1 and the P2 are not provided with signals of an electronic ballast, U3 and U4 can not output relay actuation voltage, the relays can not actuate, and the P1 and the P2 are completely isolated from the L and the N.

Due to the adoption of the technical scheme, the utility model can be used for a novel ballastless bracket (namely, the state of being powered by AC) without dismantling the original traditional fluorescent lamp bracket (namely, the state of being powered by the electronic ballast), is convenient for users to use, and is energy-saving and environment-friendly.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (9)

1. An LED tube compatible power supply, comprising: the LED lamp comprises a first input terminal (P1), a second input terminal (P2), a third input terminal (P3) and a fourth input terminal (P4), and the compatible power supply further comprises a lamp tube output terminal used for being connected with the input end of a driving circuit of the LED lamp tube;

The compatible power supply further includes: the electronic ballast comprises an electronic ballast power control circuit, a PWM power supply constant current circuit, a leakage current prevention circuit and a first rectifying circuit;

The first input terminal (P1) and the second input terminal (P2) are both connected with the input end of the electronic ballast power control circuit, and the output end of the electronic ballast power control circuit is electrically connected with the control end of the leakage current prevention circuit;

The third input terminal (P3) and the fourth input terminal (P4) are connected with the lamp tube output terminal through the PWM power supply constant current circuit;

The leakage current prevention circuit comprises a first circuit for communicating the first input terminal (P1) with a second input terminal (P2) and a second circuit for connecting with the lamp output terminal through the first rectifying circuit.

2. The LED tube compatible power supply of claim 1, wherein the electronic ballast power control circuit comprises: the anti-leakage current circuit comprises a rectifying element (U4) and a voltage stabilizing circuit connected with the output end of the rectifying element (U4), wherein a first input terminal (P1) and a second input terminal (P2) are both connected with the input end of the rectifying element (U4), and the output end of the rectifying element (U4) is electrically connected with the control end of the anti-leakage current circuit.

3. The LED tube compatible power supply according to claim 2, wherein the first circuit comprises a first relay (RL 2), the second circuit comprises a second relay (RL 1), and the output end of the rectifying element (U4) is connected to the control ends of the first relay (RL 2) and the second relay (RL 1), respectively.

4. The LED tube compatible power supply of claim 2, wherein the voltage regulator circuit comprises: a voltage stabilizing tube (D12) and a complementary bias resistor built-in transistor (U3) which are arranged in parallel.

5. The LED tube compatible power supply of claim 1, wherein said first input terminal (P1) is connected to an input of said electronic ballast power control circuit through a first transformer (T2).

6. The LED tube compatible power supply of claim 5, wherein said first transformer (T2) is a non-isolated transformer.

7. The LED tube compatible power supply of claim 6, wherein the non-isolated transformer has an inductance of 100-300uH.

8. The LED lamp tube compatible power supply according to claim 1, wherein the PWM power supply constant current circuit comprises an LED constant current chip (U1) and a stroboscopic removing chip (U2), and the third input terminal (P3) and the fourth input terminal (P4) are sequentially connected with the lamp tube output terminal through the LED constant current chip (U1) and the stroboscopic removing chip (U2).

9. The LED tube compatible power supply according to claim 8, wherein the third input terminal (P3) and the fourth input terminal (P4) are connected to the LED constant current chip (U1) through a rectifier bridge (BD 1).