CN215420856U - LED driving device and lighting system - Google Patents

LED driving device and lighting system Download PDF

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Publication number
CN215420856U
CN215420856U CN202121131232.2U CN202121131232U CN215420856U CN 215420856 U CN215420856 U CN 215420856U CN 202121131232 U CN202121131232 U CN 202121131232U CN 215420856 U CN215420856 U CN 215420856U
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led
circuit
module
current
constant current
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冯润渊
全新
黄丕渠
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SHENZHEN JINGDAO ELECTRONICS CO Ltd
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SHENZHEN JINGDAO ELECTRONICS CO Ltd
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Abstract

The present application relates to an LED driving device and an illumination system, wherein, an LED driving device includes: the input end of the rectifying module is used for connecting an alternating current power supply, and the positive electrode output end of the rectifying module is used for connecting the positive electrode of the LED; the energy storage module is used for connecting the cathode of the LED; the IC control module comprises a sampling element and an LED constant current driving chip; the LED constant-current driving chip comprises a follow current circuit, a constant-current control circuit and a switch circuit, wherein the output end of the follow current circuit is used for being connected with the anode of the LED, and the input end of the follow current circuit is respectively connected with the energy storage module and the first end of the switch circuit; the control end of the switch circuit is connected with the constant current control circuit, and the second end of the switch circuit is connected with the first end of the sampling element; the first end of the sampling element is also connected with the constant current control circuit, and the second end of the sampling element is connected with the negative electrode output end of the rectification module. According to the LED constant current driving circuit, the LED constant current driving is realized, meanwhile, the peripheral circuit is simplified, and further the device cost can be reduced.

Description

LED driving device and lighting system
Technical Field
The application relates to the technical field of LED driving, in particular to an LED driving device and an illumination system.
Background
Currently, LEDs (Light-Emitting diodes) are widely used in various places as illumination Light sources. With the continuous development and improvement of electronic circuits and LED devices, the application market demands that the price of the lighting system should be reduced. However, the inventor researches and finds that the conventional lighting system has the problem of high cost because the cost is difficult to further compress when the constant current driving is realized.
SUMMERY OF THE UTILITY MODEL
Based on this, it is necessary to provide an LED driving device and an illumination system that can reduce cost and volume.
An LED driving apparatus, the apparatus comprising:
the input end of the rectifying module is used for connecting an alternating current power supply, and the positive electrode output end of the rectifying module is used for connecting the positive electrode of the LED;
the energy storage module is used for connecting the cathode of the LED;
the IC control module comprises a sampling element and an LED constant current driving chip; the LED constant-current driving chip comprises a follow current circuit, a constant-current control circuit and a switch circuit, wherein the output end of the follow current circuit is used for being connected with the anode of the LED, and the input end of the follow current circuit is respectively connected with the energy storage module and the first end of the switch circuit; the control end of the switch circuit is connected with the constant current control circuit, and the second end of the switch circuit is connected with the first end of the sampling element; the first end of the sampling element is also connected with the constant current control circuit, and the second end of the sampling element is connected with the negative electrode output end of the rectification module.
In one embodiment, the constant current driving circuit includes a current detection unit, a PFC unit, a current control unit, and a switch driving unit;
the power detection unit is respectively connected with the first end of the sampling element, the PFC unit and the current control unit, the current control unit is connected with the PFC unit, the PFC unit is connected with the switch driving unit, and the switch driving unit is connected with the control end of the switch circuit.
In one embodiment, the LED constant current driving chip further comprises an overvoltage protection circuit and a latch restart circuit; the overvoltage protection circuit is respectively connected with the negative electrode output end and the locking restarting circuit, and the locking restarting circuit is also connected with the switch driving unit.
In one embodiment, the LED driving apparatus further includes an OVP resistor; the OVP resistor is connected between the overvoltage protection circuit and the negative output end.
In one embodiment, the LED driving apparatus further includes an output filtering module; one end of the output filtering module is connected with the anode output end, and the other end of the output filtering module is connected with the energy storage module.
In one embodiment, the output filtering module comprises a first capacitor and a load resistor; one end of the first capacitor is connected with the positive electrode output end and one end of the load resistor respectively, and the other end of the first capacitor is connected with the energy storage module and the other end of the load resistor respectively.
In one embodiment, the LED driving apparatus further includes an input filtering module; one end of the input filtering module is connected with the anode output end, and the other end of the input filtering module is connected with the cathode output end.
In one embodiment, the LED constant current driving chip is a JD9592 model chip;
in one embodiment, the collation module is a bridge rectifier stack; and/or the energy storage module is an inductor.
In one embodiment, there is provided a lighting system comprising an LED and the LED driving apparatus of any of the above embodiments.
The LED driving device and the lighting system comprise a rectifying module, an energy storage module and an IC control module, wherein the input end of the rectifying module is used for being connected with an alternating current power supply, the positive output end of the rectifying module is used for being connected with the positive pole of an LED, and the energy storage module is used for being connected with the negative pole of the LED. The IC control module comprises a sampling element and an LED constant current driving chip, and a constant current control circuit, a switching circuit and a follow current circuit are arranged in the LED constant current driving chip. The constant-current control circuit is respectively connected with the first end of the sampling element and the control end of the switch circuit, the first end of the switch circuit is respectively connected with the input ends of the energy storage module and the follow current circuit, the input end of the follow current circuit is further connected with the energy storage module, and the output end of the follow current circuit is used for being connected with the anode of the LED. The second end of the switch circuit is connected with the first end of the sampling element, and the second end of the sampling element is connected with the negative electrode output end of the rectifying module. Therefore, the constant current control circuit can determine the current flowing through the LED according to the voltage of the acquisition element, and adjust the charging and discharging state of the energy storage module by controlling the on-off of the switch circuit so as to realize the constant current drive of the LED. Meanwhile, the follow current circuit is arranged in the LED constant current driving chip and is correspondingly connected with the energy storage module and the anode of the LED, so that the LED constant current driving chip can be more integrated, a follow current loop can be formed through the LED and the LED constant current driving chip, and a follow current element is not required to be arranged in a peripheral circuit. When the LED constant current driving is realized, the number of components of the peripheral circuit of the LED constant current driving chip is reduced, the peripheral circuit is simplified, the device cost can be reduced, and the design difficulty of the device volume for reducing the shell structure of the lighting system is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic block diagram of an LED driving apparatus according to an embodiment;
FIG. 2 is a schematic block diagram of an LED constant current driving chip in one embodiment;
FIG. 3 is a pin bitmap of an LED constant current driver chip in one embodiment;
fig. 4 is a circuit diagram of an LED driving apparatus according to an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
As described in the background art, the prior art has a problem of high cost when implementing constant current driving. The inventor researches and discovers that the problem is caused because the price of various components (such as a resistor, a capacitor, a diode, an inductor and the like) is difficult to further reduce, so that the cost of the lighting system is difficult to reduce under the condition that the number of the components of a peripheral circuit of the LED constant current driving chip is not changed.
In order to solve the problem, the market requirement is met by seeking a circuit structure with fewer components, specifically, the LED constant-current driving chip with a specific structure is adopted, LED constant-current driving is achieved, meanwhile, a freewheeling diode in a peripheral circuit of the LED constant-current driving chip can be omitted, the peripheral circuit is simplified, and the effect of reducing cost is achieved. Meanwhile, the size of the LED driving device can be reduced by reducing the number of components in the peripheral circuit, and the design difficulty of the shell structure of the lighting system is convenient to reduce.
In one embodiment, referring to fig. 1, fig. 1 provides an LED driving apparatus. The LED driving apparatus includes a rectifying module 100, an energy storage module 200, and an IC (Integrated Circuit Chip) control module. The rectifier module 100 includes an input end, an anode output end and a cathode output end, the input end of the rectifier module 100 is used for connecting an ac power supply, for example, the input end can be connected to a mains supply, the anode output end is used for connecting an anode of an LED, and the cathode output end is used for connecting the IC control module 300. The rectifying module 100 is configured to rectify an ac power and output a dc power signal from an anode output terminal and a cathode output terminal, so as to provide a working power to the LED and drive the LED to emit light. It is understood that the rectifier module 100 can be implemented by any type of circuit structure, and the present application is not limited thereto. In one embodiment, the rectifier module 100 may be a bridge rectifier stack, and in one example, the outside of the rectifier module 100 may be a full wave bridge rectifier stack of type MB 6F. Similarly, the energy storage module 200 may be implemented by any type of energy storage element or circuit structure, which is not limited in this application. In one example, the energy storage module 200 may be an inductor.
The IC control module 300 includes a sampling element 320 and an LED constant current driving chip 310, wherein the sampling element 320 may be implemented by using any circuit structure whose equivalent circuit is a resistor, and may be, for example, one or more resistors. The LED constant current driving chip 310 includes a freewheeling circuit 312, a constant current control circuit 314, and a switching circuit 316, wherein an output terminal of the freewheeling circuit 312 is used to connect to an anode of the LED, and an input terminal of the freewheeling circuit 312 is connected to the energy storage module 200 and a first terminal of the switching circuit 316, respectively. The control end of the switch circuit 316 is connected to the constant current control circuit 314, the second end of the switch circuit 316 is connected to the first end of the sampling element 320, the first end of the sampling element 320 is further connected to the constant current control circuit 314, and the second end of the sampling element 320 is connected to the negative output end of the rectifier module 100.
The freewheel circuit 312 may be a unidirectional circuit, in which the current flowing through the freewheel circuit 312 flows from the input terminal of the freewheel circuit 312 to the output terminal of the freewheel circuit 312. The constant current control circuit 314 is a circuit for controlling the on/off state of the switch circuit 316. The switch circuit 316 is a circuit having a switching function, and the switch circuit 316 can control the on/off state between the first terminal and the second terminal according to the input voltage (or the input current) of the control terminal, for example, when the voltage of the control terminal is a conducting voltage, the first terminal and the second terminal of the switch circuit 316 are in a conducting state, and at this time, the first terminal of the switch circuit 316 is connected to the second terminal of the switch circuit 316; conversely, when the voltage of the control terminal is the off-voltage, the first terminal and the second terminal of the switch circuit 316 are in the off-state, and at this time, the first terminal of the switch circuit 316 and the second terminal of the switch circuit 316 are in the off-state. It is understood that the switching circuit 316 may be implemented using any type of device or circuit configuration and is not limited in this application. In one example, the switch circuit 316 is a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) Transistor.
Specifically, referring to fig. 1, when the switch circuit 316 is in a conducting state, the rectifying module 100, the LED, the energy storage module 200, the LED constant current driving chip 310 and the sampling element 320 form a main loop, and the rectifying module 100 can charge the energy storage module 200. At this time, the LED load current is mainly determined by the resistance value of the sampling element 320, and since the sampling element 320 is connected in series in the main loop, once the resistance value of the sampling element 320 is determined, the voltage drop across the sampling element 320 is higher and higher as the current of the main loop is continuously increased. The constant current control circuit 314 collects the voltage at the first end of the sampling element 320, and accordingly determines the LED load current and controls the on/off state of the switch circuit 316. When the voltage at the first end of the sampling element 320 is higher than the voltage threshold, the constant current control circuit 314 may switch the on-off state of the switch circuit 316 to an off state, at this time, the LED, the energy storage module 200 and the freewheeling circuit 312 inside the LED constant current driving chip 310 form a freewheeling circuit, and the energy stored in the energy storage module 200 completes energy release through the freewheeling circuit 312 and the load LED. Therefore, constant current can be provided for the LED, and the effect of constant current driving is achieved.
In the above LED driving apparatus, the constant current control circuit 314 may determine the current flowing through the LED according to the voltage of the collecting element, and adjust the charge-discharge state of the energy storage module 200 by controlling the on-off of the switch circuit 316, so as to implement the constant current driving of the LED. Meanwhile, the follow current circuit 312 is arranged in the LED constant current driving chip 310, and the follow current circuit 312 is correspondingly connected to the anodes of the energy storage module 200 and the LED, so that the LED constant current driving chip 310 can be more integrated, a follow current loop can be formed through the LED and the LED constant current driving chip 310, and no follow current element is required to be arranged in a peripheral circuit. When the LED constant current driving is realized, the number of components of the peripheral circuit of the LED constant current driving chip 310 is reduced, the peripheral circuit is simplified, the device cost can be reduced, and the design difficulty of the shell structure of the lighting system is reduced by reducing the device size.
In one embodiment, referring to fig. 2, the constant current driving circuit includes a current detection unit 332, a PFC (Power Factor Correction) unit 334, a current control unit 336, and a switch driving unit 338. The current detection unit 332 is respectively connected to the first end of the sampling element 320, the PFC unit 334 and the current control unit 336, the current control unit 336 is connected to the PFC unit 334, the PFC unit 334 is connected to the switch driving unit 338, and the switch driving unit 338 is connected to the control end of the switch circuit 316.
Specifically, the current detection unit 332 collects the voltage of the first terminal of the sampling element 320, compares the collected voltage with a reference voltage, and transmits the comparison result to the PFC unit 334 and the current control unit 336. That is, the current detection unit 332 may send the compared signal to the PFC unit 334 and the current control unit 336 for processing, and the PFC unit 334 transmits the processed signal to the switch driving unit 338, so that the switch driving unit 338 controls the on-off state of the switch circuit 316. Meanwhile, the PFC unit 334 may implement a high power factor function to provide a stable current to the LED lamp.
In this embodiment, the LED constant current driving chip 310 completes constant current control through the current detection unit 332, the PFC unit 334, the current control unit 336 and the switch driving unit 338 therein, and can realize the function of high power factor.
In one embodiment, referring to fig. 2, the LED constant current driving chip 310 further includes an overvoltage protection circuit 350 and a latch-up restart circuit 360. The overvoltage protection circuit 350 is respectively connected to the negative output terminal of the rectifier module 100 and the lockout restart circuit 360, and the lockout restart circuit 360 is connected to the switch driving unit 338.
Specifically, the overvoltage protection circuit 350 is configured to collect the dc power signal output by the rectifying module 100 to determine whether the dc power signal output by the rectifying module 100 is overvoltage. When the rectifier module 100 outputs an overvoltage power signal, the overvoltage protection circuit 350 may adjust the on-off state of the switch circuit 316 through the latching restart circuit 360 and the switch driving unit 338, so as to prevent the overvoltage power signal from damaging the LED, and improve the safety and reliability of the system.
In one embodiment, the LED driving apparatus further includes an OVP (Overvoltage Protection) resistor R2, the OVP resistor R2 is connected between the Overvoltage Protection circuit 350 and the negative output terminal of the rectifier module 100, and is used for adjusting the Overvoltage Protection voltage, i.e., the specific voltage value of the Overvoltage Protection voltage may be determined according to the OVP resistor R2. Thus, the applicability of the LED driving device can be improved.
In one embodiment, the LED constant current driver chip 310 is a JD9592 type chip, the JD9592 type chip is a non-isolated buck constant current driver chip with a source PFC function, and the package form is SOP-7. The JD9592 chip has the following advantages: (1) the method comprises the following steps of (1) wide power supply working, (2) good constant current characteristic, (3) direct power supply of bus voltage, (4) built-in power high-voltage MOSFET, (5) critical continuous conduction working mode, high efficiency, (6) built-in short circuit protection, overvoltage protection and overvoltage protection, and (7) low output current ripple and high power factor.
An internal structure block diagram of a JD9592 type chip may be shown in fig. 2, and the chip includes a first MOS transistor MOS1, a second MOS transistor MOS2, a freewheeling diode D1, a power supply circuit 370, a UVLO (Under Voltage Lock Out) circuit 380, an overvoltage protection circuit 350, a latch restart circuit 360, a current control unit 336, a PFC unit 334, a switch driving unit 338, a current detection unit 332, and a timer 340. The bitmap of the IC pins of the JD9592 model chip may specifically include a VIN pin, an OVP pin, a DRAIN pin, a CS pin, a GND pin, and an NC pin, as shown in fig. 3. The drain of the first MOS transistor MOS1 is connected to the VIN pin, the gate of the first MOS transistor MOS1 is connected to the source of the first MOS transistor MOS1, the power supply circuit 370 and the UVLO circuit 380, the UVLO circuit 380 is connected to the latch restart circuit 360, the latch restart circuit 360 is connected to the overvoltage protection circuit 350 and the switch driving unit 338, the switch driving unit 338 is connected to the gate of the second MOS transistor MOS2, the drain of the second MOS transistor MOS2 is connected to the drain pin and the anode of the freewheeling diode D1, and the cathode of the freewheeling diode D1 is connected to the VIN pin. The source of the second MOS transistor MOS2 is connected to the CS pin and the current detection unit 332, the current detection unit 332 is connected to the PFC unit 334 and the current control unit 336, the current control unit 336 is connected to the PFC unit 334, and the PFC unit 334 is connected to the timer 340 and the switch driving unit 338. The over-voltage protection circuit 350 is connected to the OVP pin.
Specifically, the bus voltage current enters the first MOS transistor MOS1 through the VIN pin, the first MOS transistor MOS1 is in a conducting state, and the current enters the power supply circuit 370 and the UVLO circuit 380, so that the power supply function of the chip is turned on to provide energy for the entire chip. The latch restart circuit 360 serves as a gate level of chip control, and performs processing and judgment according to signals of an OVP pin acquired by the OVP circuit to transmit energy to the switch driving unit 338 as energy for driving the second MOS transistor MOS 2. Therefore, multiple protection functions are integrated in the LED constant current driving chip 310, and the safety and reliability of the LED driving device and the lighting system can be further improved.
In one embodiment, the LED driving apparatus may further include an output filtering module, where the output filtering module is configured to filter the dc power signal output to the LED and provide the filtered dc power signal for the LED. Specifically, the output filter module is connected in parallel with the LED, that is, one end of the output filter module is connected to the positive output end of the rectifier module 100 and the positive electrode of the LED, and the other end of the output filter module is connected to the negative electrodes of the energy storage module 200 and the LED. Thus, the output filtering module can filter the dc power signals output by the rectifying module 100 and the energy storage module 200 to reduce the interference of the harmonic to the LED driving.
It is understood that the output filter module can be implemented by any type of circuit structure, and the present application is not limited thereto. In an embodiment, referring to fig. 4, the output filter module includes a first capacitor C1 and a load resistor R1, further, the first capacitor C1 may be an electrolytic capacitor, and the resistance of the load resistor R1 may be much larger than that of the LED.
The first capacitor C1 is connected in parallel with the load resistor R1, and the parallel circuit is connected in parallel with the LED. That is, one end of the first capacitor C1 is connected to the positive output terminal of the rectifying module 100, one end of the load resistor R1, and the positive electrode of the LED, and the other end of the first capacitor C1 is connected to the energy storage module 200, the other end of the load resistor R1, and the negative electrode of the LED. When powered on, the first capacitor C1 may filter a dc power signal output by the energy storage module 200 or the rectification module 100 and output the filtered power signal to the LED. Because the resistance of the load resistor R1 is much larger than that of the LED, when the LED is normally switched on, power almost flows to the LED, and the current flowing through the load resistor R1 is very small, so that the load current of the LED is not influenced. When the power is off, the first capacitor C1 and the load resistor R1 form a bleeding loop, so that the first capacitor C1 can bleed electric energy through the load resistor R1, thereby preventing the electric energy in the first capacitor C1 from damaging the LEDs, and improving the safety and reliability of the lighting system.
In an embodiment, referring to fig. 4, the LED driving apparatus further includes an input filtering module, where the input filtering module is configured to filter a dc power signal output by the rectifying module 100 to the LED constant current driving chip 310, and provide the filtered power signal for the LED constant current driving chip 310. Specifically, one end of the input filter module is connected to the positive output end of the rectifier module 100, and the other end is connected to the negative output end of the rectifier module 100. In one example, one end of the input filtering module may be further connected to a VIN pin of the LED constant current driving chip 310, and the other end of the input filtering module may be further connected to a GND pin of the LED constant current driving chip 310. Therefore, the normal work of the LED constant current driving chip 310 can be ensured, the power signal is prevented from damaging the LED constant current driving chip, and the safety of the LED driving device and the lighting system is further improved
It is to be understood that the input filter circuit may be implemented using any type of circuit structure, and the present application is not limited thereto. In one embodiment, the input filtering module may include a second capacitor C2, one end of the second capacitor C2 is connected to the positive output terminal of the rectifying module 100 and the VIN pin of the LED constant current driving chip 310, and the other end of the second capacitor C2 is connected to the negative output terminal of the rectifying module 100 and the GND pin of the LED constant current driving chip 310. In one example, the second capacitance C2 may be a CBB capacitance.
To facilitate understanding of the aspects of the present application, a specific example will be described below. The circuit structure of the LED driving apparatus may be as shown in fig. 4, and includes a first capacitor C1, a second capacitor C2, a load resistor R1, an OVP resistor R2, a current-limiting resistor R3 (i.e., the above-mentioned sampling element), a safety resistor, a rectifier bridge stack, an inductor (which may be implemented using a transformer), and an LED constant current driving chip 310. The rectifier bridge stack is a full-wave rectifier bridge stack, the LED constant current driving chip 310 is a JD9592 chip, an internal structure block diagram of the chip is shown in fig. 2, and a pin bitmap thereof is shown in fig. 3.
One end of the safety resistor is used for connecting a live wire, and the other end of the safety resistor is connected with a first input end of the rectifier bridge stack. The second input end of the rectifier bridge stack is connected with a zero line, the positive output end of the rectifier bridge stack is respectively connected with one end of a first capacitor C1, one end of a second capacitor C2, one end of a load resistor R1, a VIN pin of the LED constant-current driving chip 310 and the positive electrode of the LED, and the negative output end of the rectifier bridge stack is respectively connected with the other end of the second capacitor C2, one end of an OVP resistor R2, a GND pin of the LED constant-current driving chip 310, one end of a current-limiting resistor R3 and the ground. The other end of the OVP resistor R2 is connected to the OVP pin of the LED constant current driving chip 310. The CS pin of the LED constant current driving chip 310 is connected with the other end of the current limiting resistor R3, the DRAIN pin is connected with one end of the transformer, and the other end of the transformer is respectively connected with the other end of the first capacitor C1, the other end of the load resistor R1 and the cathode of the LED.
Specifically, the bridge rectifier rectifies the ac power signal output from the ac power source, and the second capacitor C2 filters the dc power signal output from the bridge rectifier and outputs a filtered power signal. The filtering power supply signal is directly supplied with power through the VIN pin of the LED constant current driving chip 310, and when the voltage applied to the VIN pin reaches the start voltage (VIN _ ST) inside the chip, the LED constant current driving chip 310 is driven and controlled to start working, and the switch of the second MOS transistor MOS2 performs a switching operation.
When the second MOS transistor MOS2 is turned on, the input current passes through the LED, the inductor, the second MOS transistor MOS2 inside the LED constant current driving chip 310, and the current limiting resistor R3, and is input to the negative electrode of the rectifier bridge stack. The current in the inductor also slowly rises while the LED is emitting light, and the inductor completes energy storage when the current of the inductor reaches a peak value.
When the second MOS transistor MOS2 is turned off, the current flowing through the inductor forms a freewheeling circuit with the LED through the freewheeling circuit 312 (i.e., the freewheeling diode D1) inside the LED constant current driving chip 310 due to the principle that the voltage across the capacitor cannot change abruptly and the current flowing through the inductor cannot change abruptly. The current in the inductor drops to zero from the peak value, the inductor finishes energy release, and then the second MOS transistor MOS2 is conducted again and starts the next cycle. Constant current driving of the LED is realized through continuous repeated switching work.
The current flowing through the LED is mainly determined by the resistance of the current limiting resistor R3, and since the current limiting resistor R3 is connected in series in the main loop, once the resistance of the current limiting resistor R3 is determined, the voltage drop generated across the current limiting resistor R3 increases with the increase of the inductor current. The voltage drop of the current-limiting resistor R3 is fed back to the CS pin of the LED constant current driving chip 310, and compared with the reference voltage inside the LED constant current driving chip 310. When the voltage drop of the current-limiting resistor R3 is greater than or equal to the reference voltage, the chip turns off the second MOS tube MOS2, so that the purpose of constant current can be achieved, and constant current is provided for the LED.
The LED driving apparatus shown in fig. 4 is applied to LED lamps with different powers to obtain the test results shown in table 1.
Table 17-12 WLED lamp experiment test results
The LED driving device reduces the number of components of a peripheral circuit of an LED constant current driving chip while realizing LED constant current driving, simplifies the peripheral circuit, further reduces the device cost, and reduces the design difficulty of the device volume to reduce the shell structure of a lighting system.
In one embodiment, there is provided a lighting system comprising an LED and the LED driving apparatus of any of the above embodiments. In one embodiment, the LED may be a bulb.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. An LED driving apparatus, comprising:
the input end of the rectification module is used for connecting an alternating current power supply, and the positive electrode output end of the rectification module is used for connecting the positive electrode of the LED;
the energy storage module is used for connecting the cathode of the LED;
the IC control module comprises a sampling element and an LED constant current driving chip; the LED constant-current driving chip comprises a follow current circuit, a constant-current control circuit and a switch circuit, wherein the output end of the follow current circuit is used for being connected with the anode of the LED, and the input end of the follow current circuit is respectively connected with the energy storage module and the first end of the switch circuit; the control end of the switch circuit is connected with the constant current control circuit, and the second end of the switch circuit is connected with the first end of the sampling element; the first end of the sampling element is also connected with the constant current control circuit, and the second end of the sampling element is connected with the negative electrode output end of the rectifying module.
2. The LED driving device according to claim 1, wherein the constant current driving circuit includes a current detection unit, a PFC unit, a current control unit, and a switch driving unit;
the current detection unit is respectively connected with the first end of the sampling element, the PFC unit and the current control unit, the current control unit is connected with the PFC unit, the PFC unit is connected with the switch driving unit, and the switch driving unit is connected with the control end of the switch circuit.
3. The LED driving device according to claim 2, wherein the LED constant current driving chip further comprises an overvoltage protection circuit and a latch-up restart circuit;
the overvoltage protection circuit is respectively connected with the cathode output end and the lockout restart circuit; the locking restart circuit is connected with the switch driving unit.
4. The LED driving apparatus according to claim 3, further comprising an OVP resistor;
the OVP resistor is connected between the overvoltage protection circuit and the negative electrode output end.
5. The LED driving apparatus according to claim 1, further comprising an output filtering module;
one end of the output filtering module is connected with the positive electrode output end, and the other end of the output filtering module is connected with the energy storage module.
6. The LED driving apparatus according to claim 5, wherein the output filtering module comprises a first capacitor and a load resistor;
one end of the first capacitor is connected with the anode output end and one end of the load resistor respectively, and the other end of the first capacitor is connected with the energy storage module and the other end of the load resistor respectively.
7. The LED driving apparatus according to claim 1, further comprising an input filtering module;
one end of the input filtering module is connected with the positive electrode output end, and the other end of the input filtering module is connected with the negative electrode output end.
8. The LED driving device according to any one of claims 1 to 7, wherein the LED constant current driving chip is a JD9592 chip.
9. The LED driving device according to any one of claims 1 to 7, wherein the rectifying module is a bridge rectifier; and/or the energy storage module is an inductor.
10. An illumination system comprising an LED and the LED driving apparatus according to any one of claims 1 to 9.
CN202121131232.2U 2021-05-25 2021-05-25 LED driving device and lighting system Active CN215420856U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121131232.2U CN215420856U (en) 2021-05-25 2021-05-25 LED driving device and lighting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121131232.2U CN215420856U (en) 2021-05-25 2021-05-25 LED driving device and lighting system

Publications (1)

Publication Number Publication Date
CN215420856U true CN215420856U (en) 2022-01-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
CN (1) CN215420856U (en)

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