CN215187496U

CN215187496U - High-integration LED bulb lamp driving circuit

Info

Publication number: CN215187496U
Application number: CN202120746648.9U
Authority: CN
Inventors: 卓楚光
Original assignee: Guangdong Dp Co ltd
Current assignee: Guangdong Dp Co ltd
Priority date: 2021-04-13
Filing date: 2021-04-13
Publication date: 2021-12-14
Anticipated expiration: 2031-04-13

Abstract

The utility model provides a high integrated LED ball bubble lamp drive circuit, including input circuit, LED drive circuit, illumination output circuit, LED drive circuit includes power switch chip U1, input circuit's positive input end is connected with power switch chip U1's power supply pin HV and illumination output circuit's positive output, power switch chip U1's current detection pin CS connects sampling resistance RS 2's first end, sampling resistance RS 2's second end and power switch chip U1's chip ground pin GND connect the positive input end of input circuit after connecing altogether, power switch chip U1's power tube drain electrode input pin DRAI N passes through energy storage inductance L1 and connects illumination output circuit's negative output end, sampling resistance RS 2's second end ground connection. The novel LED driving circuit does not need a VDD capacitor design in the whole driving circuit, achieves stable power constant current output, and does not need an independent power supply to drive an LED; meanwhile, the bulb lamp is not required to be additionally connected with components such as a diode, the design concept of the volume of the bulb lamp is met, the lamp body is more convenient to assemble and design, and the cost is lower.

Description

High-integration LED bulb lamp driving circuit

Technical Field

The utility model relates to a LED drive circuit technical field especially relates to a high integrated LED ball bubble lamp drive circuit.

Background

The existing LED driving circuit is complex in structure, elements such as inductors are large in size, difficult to concentrate in a circuit board in an outer cover of the existing LED lamp, not beneficial to production and processing, and meanwhile, difficult in heat dissipation and short in service life of the LED lamp, for example, in a patent authorized by the publication No. CN207589244U, a transformer is needed, the production cost is high, and the structure is complex.

SUMMERY OF THE UTILITY MODEL

The LED bulb lamp drive circuit at least solves the problem of a high-integration LED bulb lamp drive circuit in the prior art.

The utility model provides a high integrated LED ball bubble lamp drive circuit, LED drive circuit includes power switch chip U1, input circuit's positive input end is connected with power switch chip U1's power supply pin HVDD and illumination output circuit's positive output, sampling resistance RS 2's first end is connected to power switch chip U1's current detection pin CS, sampling resistance RS 2's second end and power switch chip U1's chip ground pin GND connect the negative input end and the ground connection of back connection input circuit altogether, power switch chip U1's power tube DRAIN electrode input pin DRAIN passes through energy storage inductance L1 and connects illumination output circuit's negative output end.

In some embodiments, the lighting output circuit includes 1 or more light emitting diodes connected in series in sequence, an anode of the light emitting diode is connected to the positive input terminal of the input circuit, a cathode of the light emitting diode is connected to the first terminal of the energy storage inductor L1, and the second terminal of the energy storage inductor L1 is connected to the power tube DRAIN input pin DRAIN of the power switch chip U1.

In some embodiments, the input circuit includes a rectifier bridge and a filter circuit, wherein,

the first input end of the rectifier bridge is connected with the input end of the alternating current live wire, the second input end of the rectifier bridge is connected with the input end of the alternating current zero line, and the positive output end of the rectifier bridge is used as the positive output end of the input circuit;

the filter circuit adopts a filter capacitor CE1, a first end of a filter capacitor CE1 is connected to the positive output end of the rectifier bridge, and a second end of a filter capacitor CE1 is connected to a second end of the sampling resistor RS 2.

In some embodiments, the lighting output circuit further includes a capacitor C1, a first terminal of the capacitor C1 is connected to a first terminal of the energy storage inductor L1, and a second terminal of the capacitor C1 is connected to an anode of the light emitting diode.

In some embodiments, the lighting output circuit further comprises a resistor R1 connected in parallel to the first and second terminals of the capacitor C1.

In some embodiments, both the filter capacitor CE1 and the capacitor C1 are electrolytic capacitors.

Compared with the prior art, the beneficial effects of the utility model are that: the model KP1750 of the chip is adopted, the chip integrates 500VMOSFET, and integrates 600V ultrafast recovery diode to integrate a high-voltage self-powered circuit, so that the design of a VDD capacitor is not needed in the whole driving circuit, the stable power constant current output can be achieved, and an independent power supply is not needed to drive the LED to work; meanwhile, the bulb lamp is not required to be additionally connected with components such as a diode, the design concept of the volume of the bulb lamp is met, the lamp body is simpler and more convenient to assemble and design, the cost is lower, and the production efficiency is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a circuit diagram of a highly integrated LED bulb driving circuit according to an embodiment of the present invention;

fig. 2 is a circuit structure diagram of a highly integrated LED bulb driving circuit according to an embodiment of the present invention;

fig. 3 is an internal structural diagram of a power switch chip U1 according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 is a high integrated LED bulb lamp drive circuit that an embodiment provided, including input circuit 1, LED drive circuit 2, illumination output circuit 3, LED drive circuit 2 includes power switch chip U1, the positive input end of input circuit is connected with power switch chip U1's power supply pin HV and illumination output circuit's positive output end, power switch chip U1's current detection pin CS connects sampling resistance RS 2's first end, the negative input end and the ground connection of connecting input circuit after sampling resistance RS 2's second end and power switch chip U1's chip ground pin GND meets altogether, power switch chip U1's power tube DRAIN electrode input pin DRAIN passes through energy storage inductance L1 and connects illumination output circuit's negative output end, sampling resistance RS 2's second end ground connection. Therefore, the output current can be controlled by adjusting the sampling resistor RS2, and the working frequency can be changed by adjusting the size of the energy storage inductor L1.

In this embodiment, as shown in fig. 2, the power switch chip U1 has model number KP1750, SOP-4, and includes a chip ground pin GND, a power supply pin HVDD, a power tube DRAIN input pin DRAIN, and a current detection pin CS, the chip integrates a high voltage 500VMOSFET, and the integrated 600V ultrafast recovery diode integrates a high voltage self-powered circuit, so that the whole driving circuit does not need VDD capacitor design, can achieve + 5% constant current precision, and works in a quasi-resonant mode at high efficiency. In the structure of the LED bulb lamp, the volume of the bulb lamp is small, the number of peripheral components is large, the structure is complex, and particularly for the bulb lamp with the small volume, the production cost is high, so that the design and production cost of a system are simplified.

Meanwhile, the chip integrates a high-precision inductive current sampling technology, can obtain high-precision constant current output, has excellent performance of output line voltage and load regulation, and integrates a complete protection function to ensure safe and reliable operation of a system, a VDD undervoltage protection function (UVLO), a cycle-by-cycle current limit (OCP), an over-temperature protection (OTP), an LED short-circuit protection and the like.

Further, the lighting output circuit comprises 1 or more light emitting diodes connected in series in sequence, the anode of each light emitting diode is connected with the positive input end of the input circuit, the cathode of each light emitting diode is connected with the first end of the energy storage inductor L1, and the second end of the energy storage inductor L1 is connected with the DRAIN input pin DRAIN of the power tube of the power switch chip U1.

The lighting output circuit further comprises a capacitor C1, a first end of the capacitor C1 is connected with a first end of the energy storage inductor L1, and a second end of the capacitor C1 is connected with an anode of the light emitting diode. Therefore, the voltage reduction function can be achieved, and the current impact caused by voltage sudden change can be prevented.

The lighting output circuit further includes a resistor R1 connected in parallel to the first and second terminals of the capacitor C1. Therefore, the overvoltage operation is prevented, and the damage of the lamp caused by overlarge current is avoided.

As shown in fig. 1, in this embodiment, 6 light emitting diodes D1, D2, D3, D4, D5, and D6 are connected in series once to form a working light string, an anode of the light emitting diode D1 is connected to the second end of the energy storage inductor L1, and a cathode of the light emitting diode is connected to the first end of the energy storage inductor L1.

The input circuit comprises a rectifier bridge and a filter circuit, wherein a first input end of the rectifier bridge DB1 is connected with an alternating current live wire input end, a second input end of the rectifier bridge is connected with an alternating current zero line input end, and a positive output end of the rectifier bridge is used as a positive output end of the input circuit; the filter circuit adopts a filter capacitor CE1, a first end of a filter capacitor CE1 is connected to the positive output end of the rectifier bridge, and a second end of a filter capacitor CE1 is connected to a second end of the sampling resistor RS 2. In this embodiment, the rectifier bridge is used to rectify the input commercial power into a stable dc signal, so the input end of the rectifier circuit is connected to the commercial power, and the commercial power is 220V ac power. The pulse direct current output from the rectifying circuit is filtered by the filter capacitor C1, so that the alternating current component in the direct current output from the positive output end of the rectifying circuit is output from the ground end through the filter capacitor C1. The adjustable voltage of the driving circuit is vac180-260V/50 HZ.

Further, the rectifier bridge DB1 adopts a chip model of ABS 210.

Further, the filter capacitor CE1 and the capacitor C1 are electrolytic capacitors.

The utility model discloses the theory of operation of circuit as follows:

after a system is powered on, high-voltage pulse direct current rectified by a rectification circuit is filtered by a capacitor CE1, and then is filtered by an inductor L1 and a capacitor C1 to obtain a voltage, the voltage is supplied to a pin HV of a chip U1 and is used for supplying power to an internal power supply of the chip, when the voltage reaches a voltage value required by the operation of a driving chip U1, the driving circuit starts to operate, and the driving chip U1 enables the circuit power supply current to be stabilized at a current value set by a resistor RS2 at a pin CS. And the CS end of the chip is connected to the input end of the internal peak current comparator, and is compared with the internal threshold voltage, and when the CS voltage reaches the internal detection threshold, the power tube is turned off.

Therefore, when the power tube is turned on, an oscillating voltage is output to drive the drain input pin DRIAN of the internal MOSFET, so that the rectified high voltage passes through the anode of the light emitting diode and then reaches the cathode of the light emitting diode, the current flowing through the energy storage inductor L1 rises from zero, when the power tube is turned off, the current flowing through the energy storage inductor L1 falls from the peak value, and when the inductor current falls to zero, the chip internal logic turns on the power tube again.

In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A highly integrated LED bulb lamp driving circuit is characterized by comprising an input circuit, an LED driving circuit and an illumination output circuit, wherein,

the LED driving circuit comprises a power switch chip U1, a positive input end of the input circuit is connected with a power supply pin HVDD of the power switch chip U1 and a positive output end of the illumination output circuit, a current detection pin CS of the power switch chip U1 is connected with a first end of a sampling resistor RS2, a second end of the sampling resistor RS2 is connected with a chip ground pin GND of a power switch chip U1 in a common connection mode and then connected with a negative input end of the input circuit and grounded, and a DRAIN input pin DRAIN of a power tube of the power switch chip U1 is connected with a negative output end of the illumination output circuit through an energy storage inductor L1.

2. The high-integration LED bulb lamp driving circuit according to claim 1, wherein the lighting output circuit comprises one or more LEDs connected in series in sequence, anodes of the LEDs are connected with a positive input end of the input circuit, cathodes of the LEDs are connected with a first end of an energy storage inductor L1, and a second end of the energy storage inductor L1 is connected with a DRAIN input pin DRAIN of a power tube of the power switch chip U1.

3. The high-integration LED bulb lamp driving circuit according to claim 2, wherein the input circuit comprises a rectifier bridge and a filter circuit, wherein,

a first input end of the rectifier bridge is connected with an input end of a live wire L, a second input end of the rectifier bridge is connected with an input end of a zero line N, and a positive output end of the rectifier bridge is used as a positive output end of the input circuit; the negative output end of the rectifier bridge is grounded as the negative output end of the input circuit;

the filter circuit adopts a filter capacitor CE1, a first end of the filter capacitor CE1 is connected to the positive output end of the rectifier bridge, and a second end of the filter capacitor CE1 is connected to a second end of the sampling resistor RS 2.

4. The high-integration LED bulb lamp driving circuit according to claim 3, wherein the lighting output circuit further comprises a capacitor C1, a first terminal of the capacitor C1 is connected to a first terminal of the energy storage inductor L1, and a second terminal of the capacitor C1 is connected to an anode of the light emitting diode.

5. The high-integration LED bulb lamp driving circuit according to claim 4, wherein the lighting output circuit further comprises a resistor R1 connected in parallel to a first terminal and a second terminal of the capacitor C1.

6. The high-integration LED bulb lamp driving circuit according to claim 4, wherein the filtering capacitor CE1 and the capacitor C1 are both electrolytic capacitors.