CN217985464U

CN217985464U - LED control circuit with leakage-proof safety function and continuous dimming function

Info

Publication number: CN217985464U
Application number: CN202222091637.9U
Authority: CN
Inventors: 梁智锋
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-08-09
Filing date: 2022-08-09
Publication date: 2022-12-06
Anticipated expiration: 2032-08-09

Abstract

The utility model relates to a LED control circuit with anti-leakage safety function and continuous dimming function, which comprises an AC power end and an electronic ballast end; and one input terminal of the AC power supply terminal is shared with an input terminal of the electronic ballast terminal; the bridge rectifier module, the PWM power supply constant current module and the leakage-proof module; the PWM power supply constant current module outputs constant current to be supplied to the LED light-emitting module for use; the drain electrode of the first MOS tube is coupled to a connection point of the LED light-emitting module and the PWM power supply constant current module, and the source electrode of the first MOS tube is coupled to the second input end of the bridge rectifier module; the electronic ballast identification module is provided, one end of the electronic ballast identification module is coupled with the grid electrode of the first MOS tube, and the other end of the electronic ballast identification module is coupled with the electronic ballast end; the defect that the conventional compatible power supply cannot accord with the leakage current certification is overcome. The defect that the conventional compatible power supply of the LED fluorescent lamp cannot continuously adjust the light is overcome. When an electronic ballast input is detected, the drive power supply automatically switches to the electronic ballast function and automatically adapts to the electronic ballast including non-dimming or continuous dimming.

Description

LED control circuit with leakage-proof safety function and continuous dimming function

Technical Field

The utility model relates to a LED power control technical field especially relates to have concurrently and prevent leaking the LED control circuit of safety function and continuous dimming function.

Background

With the development and popularization of LED lighting technology, various LED lighting products are continuously appearing on the market. Due to the continuous updating and use requirements of LED products of various countries in the world, the LED energy-saving lamp is continuously improved to meet the use requirements of various occasions.

LED lamp tubes compatible with electronic ballasts have begun to be widely used, and therefore their safety performance needs to be further improved in design and improvement; meanwhile, besides normal and conventional use functions, a dimming function needs to be added in the market to achieve the effect of safety and energy conservation. Therefore, there is a need for an LED control circuit that has both a leakage-proof safety function and a continuous dimming function.

SUMMERY OF THE UTILITY MODEL

Aiming at the problem that the LED lamp tube which can be compatible with the electronic ballast does not have the anti-leakage safety function and the continuous dimming function in the prior art; provides a technical scheme for solving the problem.

In order to achieve the above object, the utility model provides a have concurrently and prevent LED control circuit of leakage safety function and continuous dimming function, include:

an AC power supply terminal and an electronic ballast terminal; and one of the input terminals of the AC power supply terminal is shared with the input terminal of the electronic ballast terminal;

a bridge rectifier module, a first input terminal of the bridge rectifier module being coupled to the AC power input terminal and the electronic ballast input terminal, and a first output terminal of the bridge rectifier module being coupled to the LED lighting module;

one end of the PWM power supply constant current module is coupled with the LED light-emitting module, the other end of the PWM power supply constant current module is coupled with the leakage-proof module, and the leakage-proof module is coupled with the second input end of the bridge rectifier module; the anti-leakage module is configured to be switched on when an alternating current signal of the AC power supply end is in a threshold range and switched off when the alternating current signal of the AC power supply end is not in the threshold range; the PWM power supply constant current module is used for outputting constant current to be supplied to the LED light-emitting module for use;

the drain electrode of the first MOS tube is coupled to a connection point of the LED light-emitting module and the PWM power supply constant current module, and the source electrode of the first MOS tube is coupled to the second input end of the bridge rectifier module;

one end of the electronic ballast identification module is coupled with the grid electrode of the first MOS tube, and the other end of the electronic ballast identification module is coupled with the electronic ballast end; the electronic ballast identification module is configured to turn on the first MOS tube when acquiring an electronic ballast input signal.

Preferably, a filtering module is further connected in series between the bridge rectifier module and the LED light emitting module.

Preferably, the PWM power constant current module includes a power management chip and a transformer; the transformer is connected between the LED light-emitting module and the power management chip in series, and the drain electrode of the first MOS tube is coupled to a connection point of the transformer and the power management chip.

Preferably, the first MOS transistor is further connected in parallel with the AC power identification module, one end of the AC power identification module is coupled to a connection point of the transformer and a drain of the first MOS transistor, and the other end of the AC power identification module is coupled to a gate of the first MOS transistor; the AC power source identification module is configured to disconnect the first MOS transistor only when an alternating current signal exists.

Preferably, the AC power source identification module includes a first capacitor, a first diode, and a second diode; the first diode and the second diode are connected in parallel and are arranged in opposite polarity, one end of the first capacitor is coupled with the connection point of the transformer and the drain electrode of the first MOS tube, the other end of the first capacitor is hooked with the connection point of the first diode and the second diode, and the connection point of the other ends of the first diode and the second diode is coupled with the grid electrode of the first MOS tube; the first capacitor is used for coupling a PWM control signal to the first diode and the second diode so as to form a negative potential at the grid electrode of the first MOS tube.

Preferably, the model of the power management chip is BP2362.

Preferably, the leakage prevention module includes a second capacitor, a first resistor, and a fast rectifier, the second capacitor is coupled to the electronic ballast, the other end of the second capacitor is coupled to the first resistor, the other end of the first resistor is coupled to the source of the first MOS transistor, one end of the fast rectifier is coupled between the second capacitor and the first resistor, and the other end of the fast rectifier is coupled to the gate of the first MOS transistor.

Preferably, the leakage prevention module comprises a DL002 chip.

The beneficial effects of the utility model are that: the utility model discloses a have concurrently and prevent leaking safety function and continuous dimming function's LED control circuit, include: an AC power supply terminal and an electronic ballast terminal; and one of the input terminals of the AC power source terminal is shared with the input terminal of the electronic ballast terminal; the bridge rectifier module, the PWM power supply constant current module and the leakage-proof module; the PWM power supply constant current module is used for outputting constant current to be supplied to the LED light-emitting module for use; the drain electrode of the first MOS tube is coupled to a connection point of the LED light-emitting module and the PWM power supply constant current module, and the source electrode of the first MOS tube is coupled to the second input end of the bridge rectifier module; the electronic ballast identification module is provided, one end of the electronic ballast identification module is coupled with the grid electrode of the first MOS tube, and the other end of the electronic ballast identification module is coupled with the electronic ballast end; the electronic ballast identification module is configured to turn on the first MOS tube when acquiring an electronic ballast input signal; the defect that the conventional compatible power supply cannot accord with the leakage current certification is overcome. The defect that the conventional compatible power supply of the LED fluorescent lamp cannot continuously adjust the light is overcome. The device can also be compatible with an inductive ballast and a direct-connection AC power supply; application scenarios are diversified.

Drawings

FIG. 1 is a system architecture diagram of the present invention;

fig. 2 is an input schematic diagram of the compatible electronic ballast of the present invention;

fig. 3 is a schematic diagram of the single-ended input of the direct AC current compatible with the electronic ballast according to the present invention;

fig. 4 is a schematic circuit diagram of the present invention.

The main element symbols are as follows:

1. an AC power supply terminal;

2. an electronic ballast end;

3. a bridge rectifier module;

4. a PWM power supply constant current module;

5. a leak-proof module;

6. an electronic ballast identification module;

7. an AC power source identification module;

8. an LED light emitting module;

c7, a first capacitor; d6, a first diode; d7, a second diode; q1, a first MOS tube;

c1, a second capacitor; r10 and a first resistor; u3, a fast rectifier tube; t1, a transformer; u1, DL002; u2 and a power management chip.

Detailed Description

In order to make the present invention clearer, the present invention will be further described with reference to the accompanying drawings.

In the following description, general example details are given to provide a more thorough understanding of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.

The utility model provides a LED control circuit with anti-leakage safety function and continuous dimming function, please refer to FIGS. 1-4; the method comprises the following steps:

an AC power supply terminal 1 and an electronic ballast terminal 2; and one of the input terminals of the AC power source terminal is shared with the input terminal of the electronic ballast terminal; the AC input end specifically comprises an input end L, an input end N and an input end P1, the electronic ballast end comprises an input end P1 and an input end P2, wherein the input end L, the input end N and the input end P1 are common input ends of the AC and the electronic ballast; the 4 input ends are respectively connected to 4 pins at two ends of the LED fluorescent lamp tube; the ends P1 and P2 are connected with PTC which is used for the filament of the analog traditional fluorescent lamp to be identified by the electronic ballast;

the first input end of the bridge rectifier module is coupled with the input end of the AC power supply and the input end of the electronic ballast, and the first output end of the bridge rectifier module is coupled with the LED light-emitting module; the bridge rectifier module is already well applied in the prior art, an input end L and an input end N are connected to the bridge rectifier circuit, a P1 is connected to the other bridge rectifier circuit, and anodes after two bridge rectifiers are connected together to supply power to the PWM constant current module;

one end of the PWM power supply constant current module 4 is coupled with the LED light-emitting module 8, the other end of the PWM power supply constant current module is coupled with the leakage-proof module, and the leakage-proof module 5 is coupled with the second input end of the bridge rectifier module; the leakage prevention module is configured to be turned on when an alternating current signal of the AC power supply terminal is in a threshold range and turned off when the alternating current signal is not in the threshold range; the PWM power supply constant current module is used for outputting constant current to be supplied to the LED light-emitting module for use; when the AC is connected, the CS pin of the chip in the anti-leakage module outputs a very short-time connection signal, and then the peripheral circuits (R2 and R3) judge the voltage drop, the voltage drop is enough, which proves that the AC is completely connected, and the CS pin can be connected for a long time. If the voltage drop is insufficient and other electric conductors (such as human or animal) pass, the CS pin cannot be conducted, so that the human body is prevented from electric shock;

the drain electrode of the first MOS tube Q1 is coupled to a connection point of the LED light-emitting module and the PWM power supply constant current module, and the source electrode of the first MOS tube Q1 is coupled to the second input end of the bridge rectifier module;

an electronic ballast identification module 6, one end of which is coupled with the grid of the first MOS tube, and the other end of which is coupled with the electronic ballast end; the electronic ballast identification module is configured to turn on the first MOS transistor when acquiring the electronic ballast input signal. After the electronic ballast identification module collects the high-frequency signal of the electronic ballast, the first MOS tube is conducted, so that the LED light-emitting module is lightened, and the first MOS tube and the fast rectifying tube can adapt to the high-frequency signal sent by various electronic ballasts including the dimmable electronic ballast, so that the continuous dimming effect is achieved.

In this embodiment, a filtering module is further connected in series between the bridge rectifier module and the LED light emitting module. Particularly, the diode D1 and the capacitor C5 are filtered by the capacitor C5 to obtain a stable direct current power supply.

In this embodiment, the PWM power constant current module includes a power management chip U2 and a transformer T1; the transformer is connected between the LED light-emitting module and the power management chip in series, and the drain electrode of the first MOS tube is coupled to a connection point of the transformer and the power management chip. The model of the power management chip U2 is BP2362; the constant current output can be controlled by PWM to drive the LED light-emitting module.

In this embodiment, the first MOS transistor is further connected in parallel with an AC power identification module 7, one end of the AC power identification module is coupled to a connection point between the transformer and the drain of the first MOS transistor, and the other end of the AC power identification module is coupled to the gate of the first MOS transistor; the AC power source identification module is configured to disconnect the first MOS transistor only when the AC power source identification module has the AC signal.

In this embodiment, the AC power source identification module includes a first capacitor C7, a first diode D6, and a second diode D7; the first diode and the second diode are connected in parallel and are arranged in opposite polarity, one end of the first capacitor is coupled with the connection point of the transformer and the drain electrode of the first MOS transistor, the other end of the first capacitor is hooked with the connection point of the first diode and the second diode, and the connection point of the other ends of the first diode and the second diode is coupled with the grid electrode of the first MOS transistor; the first capacitor is used for coupling the PWM control signal to the first diode and the second diode so as to form a negative potential at the grid electrode of the first MOS transistor Q1. And the Q1 MOS tube is forcibly closed, so that the AC current abnormity caused by the conduction of the MOS tube is prevented.

In this embodiment, the electronic ballast identification module 6 includes a second capacitor C1, a first resistor R10 and a fast rectifier U3, the second capacitor is coupled to the electronic ballast, the other end is coupled to the first resistor, the other end of the first resistor is coupled to the source of the first MOS transistor, one end of the fast rectifier is coupled between the second capacitor and the first resistor, and the other end is coupled to the gate of the first MOS transistor. U3 is a high frequency signal rectification chip, and when ballast signal input, high frequency signal can be through C1 coupling, then comes out through U3 high frequency rectification, just can work when using electronic ballast to have the high frequency signal. When AC alternating current is used, the R10 coil can short-circuit an alternating low-frequency signal to the ground, and U3 can not output an electric signal to drive Q1.

In the present embodiment, the leakage prevention module includes a DL002 chip. The leakage-proof circuit composed of the U1 and the peripheral circuit identifies AC power supply, when the L and N or P1 of the LED compatible power supply are connected with AC alternating current, the MOS tube in the U1 is conducted, and the LED compatible power supply outputs normally. When the L and the N or the P1 of the LED compatible power supply are not directly connected to the AC, the U1 chip can detect the impedance abnormality of the input end, the leakage phenomenon is judged, and the internal MOS tube is closed.

When only AC alternating current is input, safety judgment is firstly carried out through the LED lamp, the peripheral circuits of the U2 and the U2, the U1 and the peripheral circuits thereof, so that the leakage-proof function is achieved, an alternating current signal can be sampled at the AC power supply identification module, the Q1 is ensured to be in a closed state, and the whole loop is ensured to be stable and safe; when the electronic ballast is connected, a special high-frequency signal of the electronic ballast is firstly identified and judged by the U3, so that the Q1 is conducted, and then after rectification, the special high-frequency signal sequentially passes through the D1, the LED lamp, the T1 transformer, the D4 and the Q1 to reach the second end (cathode) of the bridge rectifier module; and completing the circuit of the LED lamp.

The utility model has the advantages that:

the defect that the conventional compatible power supply cannot accord with the leakage current certification is overcome. The defect that the conventional compatible power supply of the LED fluorescent lamp cannot continuously adjust the light is overcome; when an electronic ballast input is detected, the drive power supply automatically switches to the electronic ballast function and automatically adapts to the electronic ballast including non-dimming or continuous dimming.

The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be considered by those skilled in the art shall fall within the protection scope of the present invention.

Claims

1. The utility model provides a have concurrently and prevent LED control circuit of leakage safety function and continuous dimming function which characterized in that includes:

an AC power supply terminal and an electronic ballast terminal; and one of the input terminals of the AC power source terminal is common to the input terminal of the electronic ballast terminal;

a bridge rectifier module, a first input end of the bridge rectifier module being coupled to the AC power supply terminal and the electronic ballast input terminal, and a first output end of the bridge rectifier module being coupled to the LED lighting module;

one end of the PWM power supply constant current module is coupled with the LED light-emitting module, the other end of the PWM power supply constant current module is coupled with the leakage-proof module, and the leakage-proof module is coupled with the second input end of the bridge rectifier module; the leakage prevention module is configured to be turned on when an alternating current signal of the AC power supply terminal is in a threshold range and turned off when the alternating current signal is not in the threshold range; the PWM power supply constant current module is used for outputting constant current to be supplied to the LED light-emitting module for use;

2. The LED control circuit with both leakage-prevention safety function and continuous dimming function as claimed in claim 1, wherein a filtering module is further connected in series between the bridge rectifier module and the LED light emitting module.

3. The LED control circuit with both leakage prevention safety function and continuous dimming function according to claim 1, wherein the PWM power supply constant current module comprises a power management chip and a transformer; the transformer is connected between the LED light-emitting module and the power management chip in series, and the drain electrode of the first MOS tube is coupled to a connection point of the transformer and the power management chip.

4. The LED control circuit with both leakage prevention and continuous dimming functions as claimed in claim 3, wherein the first MOS transistor is further connected in parallel with an AC power identification module, one end of the AC power identification module is coupled to a connection point of the transformer and a drain electrode of the first MOS transistor, and the other end of the AC power identification module is coupled to a gate electrode of the first MOS transistor; the AC power source identification module is configured to disconnect the first MOS transistor only when an alternating current signal exists.

5. The LED control circuit with both leakage prevention safety function and continuous dimming function according to claim 4, wherein the AC power source identification module comprises a first capacitor, a first diode and a second diode; the first diode and the second diode are connected in parallel and are arranged in opposite polarity, one end of the first capacitor is coupled with a connection point of the transformer and the drain electrode of the first MOS tube, the other end of the first capacitor is hooked with a connection point of the first diode and the second diode, and the connection point of the other ends of the first diode and the second diode is coupled with the grid electrode of the first MOS tube; the first capacitor is used for coupling a PWM control signal to the first diode and the second diode so as to form a negative potential at the grid electrode of the first MOS tube.

6. The LED control circuit with both leakage-proof safety function and continuous dimming function as claimed in claim 3, wherein the model of the power management chip is BP2362.

7. The LED control circuit with both leakage-prevention safety function and continuous dimming function as claimed in claim 1, wherein the electronic ballast identification module comprises a second capacitor, a first resistor and a fast rectifier, the second capacitor is coupled to the electronic ballast, the other end of the second capacitor is coupled to the first resistor, the other end of the first resistor is coupled to the source of the first MOS transistor, one end of the fast rectifier is coupled between the second capacitor and the first resistor, and the other end of the fast rectifier is coupled to the gate of the first MOS transistor.

8. The LED control circuit with both leakage prevention safety and continuous dimming functions as claimed in claim 1, wherein the leakage prevention module comprises a DL002 chip.