Driving circuit of LED lamp

Abstract

The utility model discloses a drive circuit of an LED lamp, which comprises a voltage input unit, a rectifier bridge module, a constant current control module, a transformer unit, a power supply unit, a grounding end and a signal control module, the voltage input unit is used for receiving external alternating current, the rectifier bridge module is used for converting the alternating current received by the voltage input unit into direct current, and the constant current control module is used for outputting the direct current. The transformer unit is used for transforming the direct current converted by the rectifier bridge module and then transmitting the direct current to the power supply unit and the signal control module, the constant current control module is used for enabling the current of the direct current transmitted to the transformer unit by the rectifier bridge module to be constant, and the power supply unit is used for supplying power to an external LED lamp. And the signal control module is used for sending a control signal to an external LED lamp. According to the driving circuit of the LED lamp, the power supply driving circuit and the control circuit of the LED lamp are combined together, and the structure of the driving circuit of the LED lamp is simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to LED technical field especially relates to a drive circuit of LED lamp. BACKGROUND

[0002] LED is regarded as the lighting source of 21st century because of the advantages of environmental protection, energy saving, long life, etc., and has begun to replace traditional light source and is applied in various lighting lamps in large quantities. However, because the characteristics of LED itself determine that its driving power supply cannot use the same power supply as ordinary incandescent lamp, so as to avoid that voltage fluctuation leads to current increase and thus damages LED, so a new power supply must be designed to fully meet the driving requirements required by LED work, so as to maximize the performance of LED and reduce the failure rate. The existing LED needs power supply driving circuit to supply power for LED when working, and if LED has other working modes, control circuit is also needed, which leads to that LED lamp needs more circuits to work, the production cost is higher, and the size of the controller is also relatively large. UTILITARIAN CONTENT

[0003] In order to solve the problem of complex structure of the driving circuit of the existing LED lamp, the utility model provides a kind of drive circuit of LED lamp.The specific technical scheme of the utility model is as follows:

[0004] A kind of drive circuit of LED lamp, including: voltage input unit, rectifier bridge module, constant current control module, transformer unit, power supply unit, ground terminal and signal control module, the voltage input unit is connected with constant current control module and transformer unit respectively by rectifier bridge module, transformer unit is connected with power supply unit and information control module respectively;The voltage input unit is used to receive external alternating current, the rectifier bridge module is used to convert the alternating current received by voltage input unit into direct current, the transformer unit is used to deliver the direct current converted by rectifier bridge module to power supply unit and signal control module after voltage transformation, the constant current control module is used to make the current of direct current delivered by rectifier bridge module to transformer unit constant, the power supply unit is used to supply power for external LED lamp, and the signal control module is used to send control signal to external LED lamp.

[0005] Further, the constant current control module comprises an LED constant current drive chip IC1, a resistor R1, a resistor R2, resistors RS1 and RS2, a capacitor C2 and a diode D7, a pin 1 of the LED constant current drive chip IC1 is connected with a ground end through the resistor R1, a pin 2 is connected with the ground end, a pin 4 is connected with an output end of the rectifier bridge module, a pin 5 is connected with an input end of the diode D7 and an input end of the transformer unit T1 respectively, a pin 6 is connected with the pin 5, a pin 8 is connected with the ground end through the resistor RS1 and the resistor RS2 respectively, the resistor R2 is connected with the capacitor C2 in parallel, one end is connected with an output end of the diode D7, and the other end is connected with the transformer unit T1 and the pin 4 of the LED constant current drive chip IC1 respectively.

[0006] Further, the model of the LED constant current drive chip U1 is BP2851.

[0007] Further, the rectifier bridge module comprises a rectifier bridge DB1 and a polarity capacitor C1, an input end of the rectifier bridge DB1 is connected with a voltage input unit, output ends are connected with the polarity capacitor C1, the pin 4 of the LED constant current drive chip IC1 and an input end of the transformer unit T1 respectively, a positive pole of the polarity capacitor C1 is connected with the output end of the rectifier bridge DB1, and a negative pole is connected with a ground end.

[0008] Further, the model of the rectifier bridge DB1 is MB10f.

[0009] Further, the power supply unit comprises a positive output end vout+, a negative output end vout-, a diode D1, a resistor R5 and a polarity capacitor C8, an input end of the diode D1 is connected with a first output end of the transformer unit T1, an output end of the diode D1 is connected with the positive output end vout+, the negative output end vout- is connected with a second output end of the transformer unit T1, the resistor R5 and the polarity capacitor C8 are connected in parallel and then connected in series between the positive output end vout+ and the negative output end vout-, and the positive output end vout+ and the negative output end vout- are used for being connected with a positive pole and a negative pole of an external LED lamp respectively.

[0010] Further, the signal control module comprises an LED signal control chip IC2, resistors R3 and R4 and a switch unit, a pin 1 of the LED signal control chip IC2 is connected with the output end of the diode D1 and the positive output end vout+ through the resistor R3 respectively, a pin 2 is connected with the first output end of the transformer unit T1 through the resistor R4, a pin 4 is connected with the negative output end vout-, a pin 5 and a pin 6 are connected with the switch unit together, and a pin 7 and a pin 8 are connected with the switch unit together.

[0011] Further, the switch unit comprises a switch 1, a switch 2, a first output port Y- and a second output port W-, one end of the switch 1 is connected with the pin 5 and the pin 6 of the LED signal control chip IC2, the other end is connected with the first output port Y-, one end of the switch 2 is connected with the pin 7 and the pin 8 of the LED signal control chip IC2, the other end is connected with the second output port W-, and the first output port Y- and the second output port W- are used for being connected with external LED lamps.

[0012] Compared with the prior art, the LED lamp driving circuit has at least the following beneficial effects: the power driving circuit and the control circuit of the LED lamp are combined together, the structure of the LED lamp driving circuit is simplified, the production cost of the LED lamp is reduced, and the volume of the controller of the LED lamp is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a circuit schematic diagram of the embodiment;

[0014] Figure 2 is a circuit diagram of the embodiment. DETAILED DESCRIPTION

[0015] The following embodiments are used to illustrate the present application, but the present application is not limited by these embodiments. The specific embodiments of the present application are modified or some technical features are replaced equivalently without departing from the spirit of the present application, and all should be covered in the technical scheme range of the present application.

[0016] As Figure 1 and Figure 2As shown, a driving circuit for an LED lamp includes: a voltage input unit, a rectifier bridge module, a constant current control module, a transformer unit, a power supply unit, a ground terminal, and a signal control module. The voltage input unit is connected to the constant current control module and the transformer unit via the rectifier bridge module, and the transformer unit is connected to the power supply unit and the information control module. The voltage input unit is configured to receive external alternating current (AC). The rectifier bridge module is configured to convert the AC power received by the voltage input unit into DC power. The transformer unit is configured to transform the DC power converted by the rectifier bridge module and transmit it to the power supply unit and the signal control module. The constant current control module is configured to maintain a constant current of the DC power transmitted by the rectifier bridge module to the transformer unit. The power supply unit is configured to power an external LED lamp. The signal control module is configured to send a control signal to the external LED lamp, thereby controlling the external LED lamp to change its operating mode. The LED lamp can change its operating mode by switching between a steady-on mode and a flashing mode, or by switching between different colors. This simplifies the driving circuit of the LED lamp and ensures that the LED lamp receives a stable operating current, allowing the LED lamp to display different operating modes according to actual needs.

[0017] As one embodiment, the constant current control module includes an LED constant current driver chip IC1, a resistor R1, a resistor R2, a resistor RS1, a resistor RS2, a capacitor C2, and a diode D7. Pin 1 of the LED constant current driver chip IC1 is connected to the ground terminal through the resistor R1, pin 2 is connected to the ground terminal, pin 4 is connected to the output terminal of the rectifier bridge module, pin 5 is respectively connected to the input terminal of the diode D7 and the input terminal of the transformer unit T1, pin 6 is connected to pin 5, and pin 8 is respectively connected to the ground terminal through the resistor RS1 and the resistor RS2. After the resistor R2 is connected in parallel with the capacitor C2, one end is connected to the output terminal of the diode D7, and the other end is respectively connected to the transformer unit T1 and pin 4 of the LED constant current driver chip IC1. The LED driver circuit adjusts the operating current of the LED through the LED constant current driver chip so that the LED lamp can obtain a stable current and prevent current fluctuations from damaging the LED lamp.

[0018] As one of the embodiments, the LED constant current drive chip U1 is BP2851. BP2851 is a high-precision step-down LED constant current drive chip. The chip works in inductive current critical continuous mode, and is suitable for non-isolated step-down LED constant current power supply with full range input voltage of 85Vac-265Vac. BP2851 chip integrates 500V power switch inside, adopts patented floating ground drive framework and current detection method, and the working current of the chip is extremely low. It does not need auxiliary winding detection and power supply, and only needs a few peripheral elements to achieve excellent constant current characteristics, greatly saving system cost and volume. The driving circuit of the LED lamp uses BP2851 chip to step down the working voltage of the LED lamp, simplifying the driving circuit of the LED lamp.

[0019] As one of the embodiments, the rectifier bridge module includes a rectifier bridge stack DB1 and a polarity capacitor C1. The input end of the rectifier bridge stack DB1 is connected with the voltage input unit, and the output end is connected with the polarity capacitor C1, the pin 4 of the LED constant current drive chip IC1 and the input end of the transformer unit T1 respectively. The positive electrode of the polarity capacitor C1 is connected with the output end of the rectifier bridge stack DB1, and the negative electrode is connected with the ground end.

[0020] As one of the embodiments, the rectifier bridge stack DB1 is MB10F. MB10F is an ultra-thin patch rectifier bridge stack, which is used to convert alternating current into direct current by using the single-phase conductivity of diode.

[0021] As one of the embodiments, the power supply unit includes a positive output end vout+, a negative output end vout-, a diode D1, a resistor R5 and a polarity capacitor C8. The input end of the diode D1 is connected with the first output end of the transformer unit T1. The output end of the diode D1 is connected with the positive output end vout+. The negative output end vout- is connected with the second output end of the transformer unit T1. The resistor R5 and the polarity capacitor C8 are connected in parallel and then connected in series between the positive output end vout+ and the negative output end vout-. The positive output end vout+ and the negative output end vout- are used to be connected with the positive electrode and the negative electrode of the external LED lamp respectively.

[0022] As one of the embodiments, the signal control module comprises an LED signal control chip IC2, a resistor R3, a resistor R4 and a switch unit, a pin 1 of the LED signal control chip IC2 is connected with an output end of a diode D1 and a positive output end vout+ through the resistor R3, a pin 2 is connected with a first output end of a transformer unit T1 through the resistor R4, a pin 4 is connected with a negative output end vout-, a pin 5 and a pin 6 are connected with the switch unit, a pin 7 and a pin 8 are connected with the switch unit. The model of the LED signal control chip IC2 can be the same as the model of the LED constant current driving chip U1, or can be TM1620, SM16704PB / PK, YX861A, FP7127 or SM2188EH and the like.

[0023] As one of the embodiments, the switch unit comprises a switch 1, a switch 2, a first output port Y- and a second output port W-, one end of the switch 1 is connected with the pin 5 and the pin 6 of the LED signal control chip IC2, and the other end is connected with the first output port Y-, one end of the switch 2 is connected with the pin 7 and the pin 8 of the LED signal control chip IC2, and the other end is connected with the second output port W-, and the first output port Y- and the second output port W- are used for being connected with external LED lamps. The first output port Y- and the second output port W- can play the role of on-off switches, and are respectively used for turning on LED lamps of different colors to realize the working mode change of the LED lamps. Or a level signal is sent to control the on-off of the LED lamps to realize the effects of flickering, constant lighting or full-off and the like.

[0024] The driving circuit of the LED lamp described in the application combines the power driving circuit and the control circuit of the LED lamp together, simplifies the structure of the driving circuit of the LED lamp, reduces the production cost of the LED lamp, and reduces the volume of the controller of the LED lamp.

[0025] The above only describes some embodiments of the application. For those skilled in the art, without departing from the creative concept of the application, a number of modifications and improvements can be made, which all belong to the protection scope of the application.

Claims

1. A driving circuit for an LED lamp, characterized in that: include: A voltage input unit, a rectifier bridge module, a constant current control module, a transformer unit, a power supply unit, a ground terminal, and a signal control module. The voltage input unit is connected to the constant current control module and the transformer unit through the rectifier bridge module, and the transformer unit is connected to the power supply unit and the information control module. The voltage input unit is used to receive external alternating current (AC); the rectifier bridge module is used to convert the AC received by the voltage input unit into DC; the transformer unit is used to transform the DC converted by the rectifier bridge module and transmit it to the power supply unit and the signal control module; the constant current control module is used to make the current of the DC power transmitted by the rectifier bridge module to the transformer unit constant; the power supply unit is used to power an external LED lamp; and the signal control module is used to send a control signal to the external LED lamp.

2. The driving circuit of the LED lamp according to claim 1, characterized in that: The constant current control module includes an LED constant current driver chip IC1, a resistor R1, a resistor R2, a resistor RS1, a resistor RS2, a capacitor C2 and a diode D7. Pin 1 of the LED constant current driver chip IC1 is connected to the ground terminal through the resistor R1, pin 2 is connected to the ground terminal, pin 4 is connected to the output terminal of the rectifier bridge module, pin 5 is respectively connected to the input terminal of the diode D7 and the input terminal of the transformer unit T1, pin 6 is connected to pin 5, and pin 8 is respectively connected to the ground terminal through the resistor RS1 and the resistor RS2. After the resistor R2 is connected in parallel with the capacitor C2, one end is connected to the output terminal of the diode D7, and the other end is respectively connected to the transformer unit T1 and pin 4 of the LED constant current driver chip IC1.

3. The driving circuit of the LED lamp according to claim 2, characterized in that: The model of the LED constant current driver chip U1 is BP2851.

4. The driving circuit of the LED lamp according to claim 2, characterized in that: The rectifier bridge module includes a rectifier bridge stack DB1 and a polarity capacitor C1. The input end of the rectifier bridge stack DB1 is connected to the voltage input unit, and the output end is respectively connected to the polarity capacitor C1, pin 4 of the LED constant current driver chip IC1 and the input end of the transformer unit T1. The positive pole of the polarity capacitor C1 is connected to the output end of the rectifier bridge stack DB1, and the negative pole is connected to the ground end.

5. The driving circuit of the LED lamp according to claim 4, characterized in that: The model of the rectifier bridge DB1 is MB10f.

6. The driving circuit of the LED lamp according to claim 2, characterized in that: The power supply unit includes a positive output terminal vout+, a negative output terminal vout-, a diode D1, a resistor R5 and a polarity capacitor C8. The input end of the diode D1 is connected to the first output end of the transformer unit T1, the output end of the diode D1 is connected to the positive output terminal vout+, and the negative output terminal vout- is connected to the second output end of the transformer unit T1. The resistor R5 and the polarity capacitor C8 are connected in parallel and then in series between the positive output terminal vout+ and the negative output terminal vout-. The positive output terminal vout+ and the negative output terminal vout- are used to be connected to the positive and negative poles of the external LED lamp respectively.

7. The driving circuit of the LED lamp according to claim 6, characterized in that: The signal control module includes an LED signal control chip IC2, a resistor R3, a resistor R4 and a switch unit. Pin 1 of the LED signal control chip IC2 is respectively connected to the output end and the positive output end vout+ of the diode D1 through the resistor R3, pin 2 is connected to the first output end of the transformer unit T1 through the resistor R4, pin 4 is connected to the negative output end vout-, pin 5 and pin 6 are commonly connected to the switch unit, and pin 7 and pin 8 are commonly connected to the switch unit.

8. The driving circuit of the LED lamp according to claim 7, characterized in that: The switch unit includes switch 1, switch 2, a first output port Y- and a second output port W-. One end of the switch 1 is connected to pins 5 and 6 of the LED signal control chip IC2, and the other end is connected to the first output port Y-. One end of the switch 2 is connected to pins 7 and 8 of the LED signal control chip IC2, and the other end is connected to the second output port W-. The first output port Y- and the second output port W- are used to connect to an external LED lamp.

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