Lighting device having multi-stage chip power feeding mechanism for improving driving efficiency

Abstract

To provide a lighting device having a multi-stage chip power feeding mechanism that improves driving efficiency.SOLUTION: A lighting device includes a light-emitting module, a rectifier module, a preliminary start-up module, a power factor correction module, a voltage conversion module, and an auxiliary power supply module. The rectifier module generates a rectified voltage. The preliminary start-up module receives the rectified voltage to enter a start-up state and converts the rectified voltage into a preliminary start-up voltage. The power factor correction module receives the preliminary start-up voltage to enter a start-up state and converts the rectified voltage into a correction voltage. The voltage conversion module includes a voltage extraction unit. The voltage conversion module converts the correction voltage into a driving voltage for driving the light-emitting module, and the voltage extraction unit converts the driving voltage into an output voltage according to a default conversion ratio. The auxiliary power supply module converts the output voltage into a working voltage and drives the power factor correction module. After the power factor correction module is driven by the working voltage, the preliminary start-up module enters a closed state.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a lighting device, and particularly to a lighting device having a multi-stage chip power supply mechanism for improving driving efficiency.

Background Art

[0002] With the continuous improvement of light-emitting diode lighting technology, the need for high-quality light-emitting diode drive power supplies is also increasing. By combining an active power factor correction (APFC) circuit and a buck converter, it is possible to prevent changes in the input voltage from affecting the light generated by the lighting device and effectively eliminate flicker. Therefore, the combination of an active power factor correction (APFC) circuit and a buck converter has been increasingly widely used. However, as the luminous efficiency of light-emitting diodes increases, the power of the drive power supply gradually decreases in order to ensure a stable light flux. However, with the decrease in the power of the drive power supply, the problem of power supply loss in the drive chip itself has also attracted attention.

[0003] When a conventional drive power supply is applied to a product with a wide input voltage range, the voltage difference for supplying power to the drive chip is large, resulting in large losses. Also, when the frequency changes, the voltage fluctuation for supplying power to the drive chip also becomes large, further increasing the losses. The above factors not only directly cause overheating of the drive chip but also affect its reliability.

[0004] Chinese Patent Application Publication No. 116685022 and Chinese Patent Application Publication No. 201328152 both disclose improved circuit structures, but still cannot effectively solve the problems of the prior art.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] An object of the present invention is to provide a lighting device having a multi-stage chip power supply mechanism for improving driving efficiency.

Means for Solving the Problems

[0007] The present invention provides a lighting device having a multi-stage chip power supply mechanism for improving driving efficiency, including a light emitting module, a rectifying module, a pre-starting module, a power factor correction module, a voltage conversion module, and an auxiliary power supply module. The rectifying module generates a rectified voltage. The pre-starting module receives the rectified voltage, enters the starting state, and converts the rectified voltage into a pre-starting voltage. The power factor correction module receives the pre-starting voltage, enters the starting state, and converts the rectified voltage into a corrected voltage. The voltage conversion module includes a voltage extraction unit. The voltage conversion module converts the corrected voltage into a driving voltage for driving the light emitting module, and the voltage extraction unit converts the driving voltage into an output voltage according to a default conversion ratio. The auxiliary power supply module converts the output voltage into an operating voltage and drives the power factor correction module. After the power factor correction module is driven by the operating voltage, the pre-starting module enters a closed state.

[0008] As an improvement of the present invention, the voltage extraction unit is a transformer.

[0009] As an improvement of the present invention, the preliminary startup module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch, and a first diode. One end of the first resistor is connected to a first node, and the other end of the first resistor is connected to one end of the second resistor. The other end of the second resistor is connected to the first end of the first switch and the negative electrode of the first diode. The positive electrode of the first diode is connected to a second node. One end of the third resistor is connected to the first node, and the other end of the third resistor is connected to one end of the fourth resistor. The other end of the fourth resistor is connected to the second terminal of the first switch, and the third terminal of the first switch is connected to a third node. The first node and the second node are respectively connected to two output terminals of the rectification module, and the third node is connected to the power supply pin of the power factor correction module.

[0010] As an improvement of the present invention, the second node is further connected to the ground.

[0011] As an improvement of the present invention, the auxiliary power supply module includes a second diode, a fifth resistor, and an operating voltage output terminal. The positive electrode of the second diode is connected to the voltage extraction unit, and the negative electrode of the second diode is connected to one end of the fifth resistor. The other end of the fifth resistor is connected to the operating voltage output, and the operating voltage output is connected to the third node.

[0012] As an improvement of the present invention, the lighting device further includes a filter module. The filter module is connected to the external power supply and the rectification module.

[0013] As an improvement of the present invention, the lighting device further includes an input module. The filter module is connected to the external power supply through the input module.

[0014] As an improvement of the present invention, the lighting unit further includes a protection module. The protection module is installed between the filter module and the input module.

[0015] As an improvement of the present invention, the power factor correction module is an active power factor correction circuit.

[0016] As an improvement of the present invention, the voltage conversion module is a buck converter, a boost converter, a boost / buck converter, a flyback converter or other similar components.

Advantages of the Invention

[0017] Based on the above, the lighting device having a multi-stage chip power supply mechanism for improving the driving efficiency according to the disclosure of the present invention can have one or more of the following advantages. (1) According to the disclosure of the present invention, the lighting device includes a light-emitting module, a rectification module, a pre-start module, a power factor correction module, a voltage conversion module and an auxiliary power supply module. The rectification module generates a rectified voltage. The pre-start module receives the rectified voltage and enters the start state, converting the rectified voltage into a pre-start voltage. The power factor correction module receives the pre-start voltage and enters the start state, converting the rectified voltage into a corrected voltage. The voltage conversion module includes a voltage extraction unit. The voltage conversion module converts the corrected voltage into a driving voltage for driving the light-emitting module, and the voltage extraction unit converts the driving voltage into an output voltage according to a default conversion ratio. The auxiliary power supply module converts the output voltage into an operating voltage and drives the power factor correction module. After the power factor correction module is driven by the operating voltage, the pre-start module enters the closed state. The above multi-stage chip power supply mechanism includes a pre-start mode and a normal power supply mode. In the pre-start mode, when the lighting device is connected to an external power supply, the power factor correction module can be started first, and the requirements for a wide voltage input can be satisfied. Therefore, the lighting device can better meet the actual application needs. (2) In one embodiment of the present invention, the lighting device has a special multi-stage chip power supply mechanism including a preliminary startup mode and a normal power supply mode. In the preliminary startup mode, the power factor correction module can be started first when the lighting device is connected to an external power supply. Since the operation mechanism of the normal power supply mode is independent of the input voltage, on the premise that the input voltage changes, the operating voltage of the control chip of the power factor correction circuit can be maintained constant to achieve low loss. Therefore, the loss of the lighting device does not increase due to the change of the input voltage, the driving efficiency of the lighting device can be greatly improved, and the performance and reliability of the lighting device can be effectively improved. (3) In one embodiment of the present invention, the lighting device has a special multi-stage chip power supply mechanism including a preliminary startup mode and a normal power supply mode. In the preliminary startup mode, the power factor correction module can be started first when the lighting device is connected to an external power supply. Since the operation mechanism of the normal power supply mode is independent of the change in the operating frequency, on the premise that the operating frequency changes, the operating voltage of the control chip of the power factor correction circuit can be maintained constant to achieve low loss, further improve the driving efficiency of the lighting device, and further improve the performance and reliability of the lighting device. (4) In one embodiment of the present invention, the normal power supply mode of the multi-stage chip power supply mechanism of the lighting device can stably drive the control chip of the power factor correction module and enable the control chip to sustain a stable operation. In this way, the operating temperature of the control chip can be significantly reduced, the energy consumption of the lighting device can be reduced, and the energy-saving requirements can be better met. Therefore, the lighting device can better conform to the trend of future development. (5) In one embodiment of the present invention, since the multi-stage chip power supply mechanism of the lighting device can be realized with a simple circuit, the desired effect can be obtained without significantly increasing the cost, and the practicality of the lighting device is improved. Therefore, the application of the lighting device can be further expanded to meet the requirements of different applications.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0019] In the following embodiments, the detailed features and advantages of the present invention are explained, and the content is sufficient for those skilled in the art to understand the technical content of the present invention and to enable its implementation accordingly, and by the disclosure content, claims and drawings of this specification, those skilled in the art can easily understand the purpose and advantages of the present invention.

[0020] Hereinafter, with reference to the related drawings, embodiments of a lighting device having a multi-stage chip power supply mechanism for improving the driving efficiency of the present invention will be described. However, for the sake of easy understanding and easy explanation in the drawings, the members in the drawings may be shown with exaggerated or reduced dimensions and ratios. In the following description and / or claims, when it is stated that a member "connects" or "couples" to another member, it may directly connect or couple to the said another member, and there may be an intervening member. When it is stated that a member "directly connects" or "directly couples" to another member, there is no intervening member, and the same should be interpreted for other terms for explaining the relationship between members or layers. For easy understanding, the same members in the following embodiments are denoted by the same reference numerals and described.

[0021] FIG. 1 is a block diagram of a circuit structure of a lighting device having a multi-stage chip power supply mechanism for improving the driving efficiency according to the first embodiment of the present invention. As shown in the figure, the lighting device 1 includes an input module 11, a filter module 12, a rectifier module 13, a power factor correction module 14, a voltage conversion module 15, a light emitting module 16, a pre-start module 17, an auxiliary power supply module 18, and an output module 19.

[0022] The input module 11 is connected to an external power supply (not shown). In one embodiment, the external power supply can be a main power supply. In another embodiment, the external power supply may be a generator or another power transmission network capable of supplying an AC input voltage.

[0023] The filter module 12 is connected to the input module 11. In one embodiment, the filter module 12 may be an electromagnetic interference filter circuit. The circuit structure of the filter module 12 should be well known to those skilled in the art and can be changed according to actual needs, so it will not be described in detail here.

[0024] The rectifier module 13 is connected to the filter module 12. In one embodiment, the rectifier module 13 can include a full-wave rectifier. In another embodiment, the rectifier module 13 may include a half-wave rectifier.

[0025] The power factor correction module 14 is connected to the rectifier module 13. In one embodiment, the power factor correction module 14 may be an active (Active PFC) power factor correction voltage (boost circuit). In another embodiment, the power factor correction module 14 may be a passive power factor correction (Passive PFC) circuit, a dynamic power factor correction (Dynamic PFC) circuit or other similar components. Since the circuit structure of the power factor correction module 14 should be well known to those skilled in the art, it will not be described in detail here.

[0026] The voltage conversion module 15 is connected to the power factor correction module 14 and includes a voltage extraction unit 151. In one embodiment, the voltage conversion module 15 may be a buck converter. In another embodiment, the voltage conversion module 15 may be a boost converter, a buck-boost converter, a flyback converter, or other similar components. In one embodiment, the voltage extraction unit 151 is a transformer. In another embodiment, the voltage extraction unit 151 may be other components having similar functions.

[0027] The output module 19 is connected to the voltage conversion module 15, and the light emitting module 16 is connected to the output module 19. In one embodiment, the light emitting module 16 can include one or more light emitting diodes (LEDs). In another embodiment, the light emitting module 16 may be a light emitting diode array or other similar components.

[0028] The pre-start module 17 is connected to the rectification module 13 and the power factor correction module 14.

[0029] The auxiliary power supply module 18 is connected to the power factor correction module 14 and the voltage conversion module 15.

[0030] The input module 11 receives an input voltage from an external power supply. The filter module 12 receives the input voltage, filters the input voltage, and generates a filtered voltage. The rectification module 13 receives the filtered voltage, rectifies the filtered voltage, and generates a rectified voltage.

[0031] Then, the pre-start module 17 can first execute the pre-start mode, receive the rectified voltage, and enter the startup state. Next, the pre-start module 17 converts the rectified voltage into a pre-start voltage to drive the power factor correction module 14 and cause the power factor correction module 14 to enter the startup state.

[0032] Next, after the power factor correction module 14 enters the startup state, the power factor correction module 14 can receive the rectified voltage and convert the rectified voltage into a corrected voltage. Next, the voltage conversion module 15 receives the corrected voltage and converts it into a driving voltage for driving the light emitting module 16 via the output module 19.

[0033] Finally, the voltage extraction unit 151 of the voltage conversion module 15 converts the driving voltage into an output voltage according to the default conversion ratio, and the auxiliary power supply module 18 can execute the normal power supply mode and convert the output voltage into an operating voltage to drive the power factor correction module 14 with the operating voltage. After the power factor correction module 14 is driven by the operating voltage, the pre-startup module 17 enters the closed state.

[0034] The above multi-stage chip power supply mechanism includes a pre-startup mode and a normal power supply mode. In the pre-startup mode, when the lighting device 1 is connected to an external power supply, the power factor correction module 14 can be started first. Then, the auxiliary power supply module 18 can execute the normal power supply mode to drive the power factor correction module 14.

[0035] The above multi-stage chip power supply mechanism meets the requirements of wide voltage input and can meet the requirements of actual applications. Also, the loss of the lighting device 1 does not increase due to changes in the input voltage or operating frequency, significantly improving the driving efficiency of the lighting device 1 and effectively improving the performance and reliability of the lighting device 1.

[0036] Of course, this embodiment is only used for illustrative purposes and does not limit the scope of the present invention. Equivalent modifications or changes made based on the lighting device having the multi-stage chip power supply mechanism for improving the driving efficiency of this embodiment should still be included in the protection scope of the present invention.

[0037] FIG. 2 is a circuit diagram of an illumination device having a multi-stage chip power supply mechanism for improving the driving efficiency according to the first embodiment of the present invention. As shown in the figure, the illumination device 1 includes an input module 11, a filter module 12, a rectifier module 13, a power factor correction module 14, a voltage conversion module 15, a light emitting module 16, a pre-start module 17, an auxiliary power supply module 18, and an output module 19.

[0038] The input module 11 is connected to an external power supply (not shown) and includes a live input terminal Lt and a neutral input terminal Nt.

[0039] The filter module 12 is connected to the input module 11. The filter module 12 includes a first inductor L1, a first capacitor C1, and a sixth resistor R6.

[0040] The rectifier module 13 is connected to the filter module 12. The rectifier module 13 may include a rectifier BD and a second capacitor C2.

[0041] The power factor correction module 14 is connected to the rectifier module 13. The power factor correction module 14 may be an active power factor correction voltage. The power factor correction module 14 includes a control chip U1, a second inductor L2, a third diode D3, a fourth diode D4, a seventh resistor R7, a first current limiting resistor RS1, a second switch Q2, a first electrolytic capacitor EC1, and a third capacitor C2. The control chip U1 has a power supply pin Pn1 and a control pin Pn2.

[0042] The voltage conversion module 15 is connected to the power factor correction module 14. The voltage conversion module 15 includes a fifth diode D5, a third switch Q3, a second current limiting resistor RS2, a second electrolytic capacitor EC2, and a voltage extraction unit 151. The voltage extraction unit 151 may include a transformer Tm.

[0043] The output module 19 is connected to the voltage conversion module 15, and the light emitting module 16 is connected to the output module 19. The output module 19 includes a positive output terminal LED+ and a negative output terminal LED-. The light emitting module 16 may include a plurality of light emitting diodes LD.

[0044] The pre-start module 17 is connected to the rectification module 13 and the power factor correction module 14. The pre-start module 17 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first switch Q1, and a first diode D1. In this embodiment, the first switch Q1 is a bipolar junction transistor (BJT). In another embodiment, the first switch Q1 may be a metal oxide semiconductor field effect transistor (MOSFET). In this embodiment, the first diode D1 may be a Zener diode. In another embodiment, the first diode D1 may be a general diode. One end of the first resistor R1 is connected to the first node N1, and the other end of the first resistor R1 is connected to one end of the second resistor R2. The other end of the second resistor R2 is connected to the first terminal (base) of the first switch Q1 and the cathode of the first diode D1, and the anode of the first diode D1 is connected to the second node N2. One end of the third resistor R3 is connected to the first node N1, and the other end of the third resistor R3 is connected to one end of the fourth resistor R4. The other end of the fourth resistor R4 is connected to the second terminal (collector) of the first switch Q1, and the third terminal (emitter) of the first switch Q1 is connected to the third node N3. The first node N1 and the second node N2 are respectively connected to two output terminals of the rectification module 13. The second node N2 is further connected to the ground GND. The third node N3 is connected to the power supply pin Pn1 of the power factor correction module 14.

[0045] The auxiliary power supply module 18 is connected to the power factor correction module 14 and the voltage conversion module 15. The auxiliary power supply module 18 includes a second diode D2, a fifth resistor R5, and an operating voltage output terminal Pt. The anode of the second diode D2 is connected to the voltage extraction unit 151, and the cathode of the second diode D2 is connected to one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected to the operating voltage output terminal Pt, and the operating voltage output terminal Pt is connected to the third node N3.

[0046] The input module 11 receives an input voltage from an external power supply. The filter module 12 receives the input voltage, filters the input voltage, and generates a filtered voltage. The rectification module 13 receives the filtered voltage, rectifies the filtered voltage, and generates a rectified voltage. After that, the pre-start module 17 can first execute the pre-start mode and receive the rectified voltage. Next, the rectified voltage forms a path among the first resistor R1, the second resistor R2, and the first diode D1. Since the base current required for the first switch Q1 (transistor) to turn on is very small, the resistance values of its current limiting resistors (the first resistor R1 and the second resistor R2) can be very high (greater than 2 MΩ), so the loss can be effectively reduced. After the first diode D1 turns on, the current passes through the third resistor R3, the fourth resistor R4, and the first switch Q1, and then passes through the collector and emitter of the first switch Q1 to supply power to the control chip U1, causing the control chip U1 to enter the startup state. The resistance values of the third resistor R3 and the fourth resistor R4 can be appropriately adjusted according to the specifications of the control chip U1, enabling the control chip U1 to be started even at low voltages and meeting the requirements of wide voltage input.

[0047] Next, after the control chip U1 enters the startup state, the power factor correction module 14 can receive the rectified voltage and convert the rectified voltage into a corrected voltage. After that, the voltage conversion module 15 receives the corrected voltage and converts it into a driving voltage for driving the light emitting module 16 via the output module 19.

[0048] Finally, after the lighting device 1 enters the normal operating state, the current passes through the positive output terminal LED+ and the negative output terminal LED-, then through the transformer Tm, and then through the third switch Q3. When the third switch Q3 enters the closed state, the current passes through the fifth diode D5 to form a freewheel loop. At this time, the voltage of the primary winding of the transformer Tm is consistent with the load voltage of the light-emitting module 16. Therefore, the default conversion ratio of the transformer can be set so that the voltage of the secondary winding of the transformer Tm is greater than the minimum value of the normal operating voltage of the control chip U1, and the stable voltage value of the first diode D1 can be set lower than the minimum value of the normal operating voltage of the control chip U1. In this way, the voltage of the secondary winding of the transformer Tm continues to convert the drive voltage into the output voltage. The auxiliary power supply module 18 can execute the normal power supply mode to convert the output voltage into the operating voltage, and output the operating voltage through the operating voltage output terminal Pt to drive the control chip U1. Since the voltage of the primary winding of the transformer Tm is consistent with the load voltage of the light-emitting module 16, the voltage of the secondary winding of the transformer Tm is also a constant value and will not change due to changes in the input voltage or the operating frequency. After the power factor correction module 14 is driven by the operating voltage, the base voltage of the first switch Q1 becomes lower than the operating voltage output from the operating voltage output terminal Pt. Therefore, the first switch Q1 enters the closed state, disconnects the connection between the third resistor R3 and the fourth resistor R4 and the power supply pin Pn1, and terminates the pre-start mode.

[0049] From the above, it can be seen that the lighting device 1 has a special multi-stage chip power supply mechanism including a pre-start mode and a normal power supply mode. In the pre-start mode, when the lighting device 1 is connected to an external power supply, the power factor correction module 14 can be started first. Since the operating mechanism of the normal power supply mode is independent of the input voltage, the operating voltage of the control chip U1 of the power factor correction module 14 can be maintained constant on the premise that the input voltage changes, and low loss can be achieved. Therefore, the loss of the lighting device 1 will not increase due to changes in the input voltage, the drive efficiency of the lighting device 1 can be greatly improved, and the performance and reliability of the lighting device 1 can be effectively improved.

[0050] In addition, the lighting device 1 has a special multi-stage chip power supply mechanism including a pre-start mode and a normal power supply mode. In the pre-start mode, when the lighting device 1 is connected to an external power source, the power factor correction module 14 can be started first. Since the operation mechanism of the normal power supply mode is independent of the change in the operating frequency, on the premise that the operating frequency changes, the operating voltage of the control chip U1 of the power factor correction module 14 can be maintained constant to achieve low loss, further improving the driving efficiency of the lighting device 1 and further improving the performance and reliability of the lighting device 1.

[0051] Moreover, the normal power supply mode of the multi-stage chip power supply mechanism of the lighting device 1 can stably drive the control chip U1 of the power factor correction module 1 and enable the control chip U1 to maintain a stable operation. In this way, the operating temperature of the control chip U1 can be significantly reduced, the energy consumption of the lighting device 1 can be reduced, and the requirement of further energy conservation can be satisfied. Therefore, the lighting device 1 can better conform to the future development trend.

[0052] Of course, this embodiment is only used for illustrative explanation and does not limit the scope of the present invention. Equivalent modifications or changes made based on the lighting device having a multi-stage chip power supply mechanism for improving the driving efficiency of this embodiment should still be included in the protection scope of the present invention.

[0053] In addition, when the conventional driving power supply is applied to a product with a wide input voltage range, the voltage difference for supplying power to the driving chip is large, so the loss also increases. Further, when the frequency changes, the fluctuation of the voltage for supplying power to the driving chip also increases, and the loss further increases. The above factors not only directly cause overheating of the driving chip, but also affect its reliability. In contrast, according to the first embodiment of the present invention, the lighting device includes a light-emitting module, a rectifying module, a pre-starting module, a power factor correction module, a voltage conversion module, and an auxiliary power supply module. The rectifying module generates a rectified voltage. The pre-starting module receives the rectified voltage, enters the starting state, and converts the rectified voltage into a pre-starting voltage. The power factor correction module receives the pre-starting voltage, enters the starting state, and converts the rectified voltage into a corrected voltage. The voltage conversion module includes a voltage extraction unit. The voltage conversion module converts the corrected voltage into a driving voltage for driving the light-emitting module, and the voltage extraction unit converts the driving voltage into an output voltage according to the default conversion ratio. The auxiliary power supply module converts the output voltage into an operating voltage and drives the power factor correction module. After the power factor correction module is driven by the operating voltage, the pre-starting module enters the closed state. The above multi-stage chip power supply mechanism includes a pre-starting mode and a normal power supply mode. In the pre-starting mode, when the lighting device is connected to an external power supply, the power factor correction module can be started first, and the requirement of wide voltage input can be satisfied. Therefore, the lighting device can better meet the actual application needs.

[0054] Also, according to the first embodiment of the present invention, the lighting device has a special multi-stage chip power supply mechanism including a pre-starting mode and a normal power supply mode. In the pre-starting mode, when the lighting device is connected to an external power supply, the power factor correction module can be started first. Since the operation mechanism of the normal power supply mode is independent of the input voltage, on the premise that the input voltage changes, the operating voltage of the control chip of the power factor correction circuit can be maintained constant, and low loss can be achieved. Therefore, the loss of the lighting device does not increase due to the change of the input voltage, the driving efficiency of the lighting device can be greatly improved, and the performance and reliability of the lighting device can be effectively improved.

[0055] Also, according to the first embodiment of the present invention, the lighting device has a special multi-stage chip power supply mechanism including a pre-start mode and a normal power supply mode. In the pre-start mode, the power factor correction module can be started first when the lighting device is connected to an external power supply. Since the operation mechanism of the normal power supply mode is independent of the change in the operating frequency, on the premise that the operating frequency changes, the operating voltage of the control chip of the power factor correction circuit is maintained constant to achieve low loss, further improve the driving efficiency of the lighting device, and further improve the performance and reliability of the lighting device.

[0056] Also, according to the first embodiment of the present invention, the normal power supply mode of the multi-stage chip power supply mechanism of the lighting device can stably drive the control chip of the power factor correction module and enable the control chip to maintain a stable operation. In this way, the operating temperature of the control chip can be significantly reduced, the energy consumption of the lighting device can be reduced, and the energy-saving requirements can be better met. Therefore, the lighting device can better conform to the trend of future development.

[0057] Furthermore, according to the first embodiment of the present invention, since the multi-stage chip power supply mechanism of the lighting device can be realized by a simple circuit, the desired effect can be obtained without significantly increasing the cost, improving the practicality of the lighting device. Therefore, the application of the lighting device can be further expanded to meet the requirements of different applications. From the above, it can be seen that the lighting device having the multi-stage chip power supply mechanism for improving the driving efficiency based on the embodiment of the present invention can indeed achieve excellent technical effects.

[0058] FIG. 3 is a circuit diagram of a lighting device having a multi-stage chip power supply mechanism for improving the driving efficiency according to the second embodiment of the present invention. As shown in the figure, the lighting device 1 includes an input module 11, a filter module 12, a rectification module 13, a power factor correction module 14, a voltage conversion module 15, a light-emitting module 16, a pre-start module 17, an auxiliary power supply module 18, and an output module 19.

[0059] The input module 11 is connected to an external power supply (not shown) and includes a live input terminal Lt and a neutral input terminal Nt.

[0060] The filter module 12 is connected to the input module 11. The filter module 12 includes a first inductor L1, a first capacitor C1, and a sixth resistor R6.

[0061] The rectifier module 13 is connected to the filter module 12. The rectifier module 13 may include a rectifier BD and a second capacitor C2.

[0062] The power factor correction module 14 is connected to the rectifier module 13. The power factor correction module 14 may be an active power factor correction voltage. The power factor correction module 14 includes a control chip U1, a second inductor L2, a third diode D3, a fourth diode D4, a seventh resistor R7, a first current limiting resistor RS1, a second switch Q2, a first electrolytic capacitor EC1, and a third capacitor C2. The control chip U1 has a power supply pin Pn1 and a control pin Pn2.

[0063] The voltage conversion module 15 is connected to the power factor correction module 14. The voltage conversion module 15 includes a fifth diode D5, a third switch Q3, a second current limiting resistor RS2, a second electrolytic capacitor EC2, and a voltage extraction unit 151. The voltage extraction unit 151 may include a transformer Tm.

[0064] The output module 19 is connected to the voltage conversion module 15, and the light emitting module 16 is connected to the output module 19. The output module 19 includes a positive output terminal LED+ and a negative output terminal LED-. The light emitting module 16 may include a plurality of light emitting diodes LD.

[0065] The preliminary startup module 17 is connected to the rectification module 13 and the power factor correction module 14. The preliminary startup module 17 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first switch Q1, and a first diode D1. In this embodiment, the first switch Q1 is a bipolar junction transistor (BJT). In another embodiment, the first switch Q1 may be a metal-oxide-semiconductor field-effect transistor (MOSFET). In this embodiment, the first diode D1 may be a Zener diode. In another embodiment, the first diode D1 may be a general diode. One end of the first resistor R1 is connected to the first node N1, and the other end of the first resistor R1 is connected to one end of the second resistor R2. The other end of the second resistor R2 is connected to the first terminal (base) of the first switch Q1 and the negative electrode of the first diode D1, and the positive electrode of the first diode D1 is connected to the second node N2. One end of the third resistor R3 is connected to the first node N1, and the other end of the third resistor R3 is connected to one end of the fourth resistor R4. The other end of the fourth resistor R4 is connected to the second terminal (collector) of the first switch Q1, and the third terminal (emitter) of the first switch Q1 is connected to the third node N3. The first node N1 and the second node N2 are respectively connected to two output terminals of the rectification module 13. The second node N2 is further connected to the ground GND. The third node N3 is connected to the power supply pin Pn1 of the power factor correction module 14.

[0066] The auxiliary power supply module 18 is connected to the power factor correction module 14 and the voltage conversion module 15. The auxiliary power supply module 18 includes a second diode D2, a fifth resistor R5, and an operating voltage output terminal Pt. The positive electrode of the second diode D2 is connected to the voltage extraction unit 151, and the negative electrode of the second diode D2 is connected to one end of the fifth resistor R5. The other end of the fifth resistor R5 is connected to the operating voltage output terminal Pt, and the operating voltage output terminal Pt is connected to the third node N3.

[0067] Since the above-mentioned members are the same as those in the foregoing embodiment, detailed description thereof is omitted herein. Different from the foregoing embodiment, the lighting device 1 of this embodiment further includes a protection module 10. The protection module 10 is installed between the filter module 12 and the input module 11. In this embodiment, the protection module 10 includes a fuse Fs. In another embodiment, the protection module 10 may be other circuits with overcurrent protection functions. With the above circuit design, the safety of the lighting device 1 is further improved, and the lighting device 1 can better meet the requirements of actual applications.

[0068] Of course, this embodiment is only used for illustrative explanation and does not limit the scope of the present invention. Equivalent modifications or changes made based on the lighting device having a multi-stage chip power supply mechanism for improving the driving efficiency of this embodiment should still be included in the protection scope of the present invention.

[0069] In summary, according to the first embodiment of the present invention, the lighting device includes a light-emitting module, a rectification module, a pre-start module, a power factor correction module, a voltage conversion module, and an auxiliary power supply module. The rectification module generates a rectified voltage. The pre-start module receives the rectified voltage, enters the start state, and converts the rectified voltage into a pre-start voltage. The power factor correction module receives the pre-start voltage, enters the start state, and converts the rectified voltage into a corrected voltage. The voltage conversion module includes a voltage extraction unit. The voltage conversion module converts the corrected voltage into a driving voltage for driving the light-emitting module, and the voltage extraction unit converts the driving voltage into an output voltage according to a default conversion ratio. The auxiliary power supply module converts the output voltage into an operating voltage and drives the power factor correction module. After the power factor correction module is driven by the operating voltage, the pre-start module enters a closed state. The above-mentioned multi-stage chip power supply mechanism includes a pre-start mode and a normal power supply mode. In the pre-start mode, when the lighting device is connected to an external power source, the power factor correction module can be started first, and the requirements for wide voltage input can be met. Therefore, the lighting device can better meet the requirements of actual applications.

[0070] Moreover, according to the first embodiment of the present invention, the lighting device has a special multi-stage chip power supply mechanism including a pre-start mode and a normal power supply mode. In the pre-start mode, the power factor correction module can be started first when the lighting device is connected to an external power supply. Since the operation mechanism of the normal power supply mode is independent of the input voltage, the operating voltage of the control chip of the power factor correction circuit can be maintained constant on the premise that the input voltage changes, and low loss can be achieved. Therefore, the loss of the lighting device does not increase due to the change of the input voltage, the driving efficiency of the lighting device can be greatly improved, and the performance and reliability of the lighting device can be effectively improved.

[0071] Moreover, according to the first embodiment of the present invention, the lighting device has a special multi-stage chip power supply mechanism including a pre-start mode and a normal power supply mode. In the pre-start mode, the power factor correction module can be started first when the lighting device is connected to an external power supply. Since the operation mechanism of the normal power supply mode is independent of the change in the operating frequency, on the premise that the operating frequency changes, the operating voltage of the control chip of the power factor correction circuit can be maintained constant, low loss can be achieved, the driving efficiency of the lighting device can be further improved, and the performance and reliability of the lighting device can be further improved.

[0072] Moreover, according to the first embodiment of the present invention, the normal power supply mode of the multi-stage chip power supply mechanism of the lighting device can stably drive the control chip of the power factor correction module and enable the control chip to sustain a stable operation. In this way, the operating temperature of the control chip can be greatly reduced, the energy consumption of the lighting device can be reduced, and the energy-saving requirements can be better met. Therefore, the lighting device can better conform to the future development trend.

[0073] Furthermore, according to the first embodiment of the present invention, since the multi-stage chip power supply mechanism of the lighting device can be realized with a simple circuit, the desired effect can be obtained without significantly increasing the cost, improving the practicality of the lighting device. Therefore, the application of the lighting device can be further expanded to meet the requirements of different applications. From the above, it can be seen that the lighting device having a multi-stage chip power supply mechanism for improving the driving efficiency based on the embodiment of the present invention can surely achieve excellent technical effects.

[0074] Although the above embodiments are described in this specification, it should be noted that they do not limit the scope of the claims of the present invention. Therefore, any changes and modifications to the embodiments described in this specification based on the innovative concept of the present invention, or the substitution of equivalent structures or equivalent processes made using the content of the specification and drawings of the present invention, and the direct or indirect application of the above technical solutions to other related technical fields are all included in the scope of the claims of the present invention.

Description of Reference Numerals

[0075] 1 Lighting device 11 Input module 12 Filter module 13 Rectifier module 14 Power factor correction module 15 Voltage conversion module 151 Voltage extraction unit 16 Light emitting module 17 Pre-start module 18 Auxiliary power supply module 19 Output module U1 Control chip L1 First inductor L2 Second inductor C1 First capacitor C2 Second capacitor C3 Third capacitor EC1 First electrolytic capacitor EC2 Second electrolytic capacitor R1 First resistor R2 Second resistor R3 Third Resistance R4 Fourth Resistance R5 Fifth Resistance R6 Sixth Resistance R7 Seventh Resistance RS1 First Current Limiting Resistance RS2 Second Current Limiting Resistance D1 First Diode D2 Second Diode D3 Third Diode D4 Fourth Diode D5 Fifth Diode LD Light Emitting Diode BD Rectifier Tm Transformer Fs Fuse Lt Live Input Terminal Q1 First Switch Q2 Second Switch Q3 Third Switch Nt Neutral Input Terminal LED+ Positive Output Terminal LED- Negative Output Terminal Pn1 Power Supply Pin Pn2 Control Pin Pt Operating Voltage Output Terminal N1 First Node N2 Second Node N3 Third Node GND Ground

Claims

1. A light emitting module; a rectification module for generating a rectified voltage; a pre-start module that receives the rectified voltage, enters a start-up state, and converts the rectified voltage into a pre-start-up voltage; a power factor correction module that receives the pre-start voltage, enters a start-up state, and converts the rectified voltage into a correction voltage; A voltage extraction unit converts the correction voltage into a driving voltage for driving the light emitting module, the voltage extraction unit being a voltage conversion module that converts the driving voltage into an output voltage according to a default conversion ratio; an auxiliary power module that converts the output voltage into an operating voltage for driving the power factor correction module; Equipped with A lighting device having a multi-stage chip power supply mechanism for improving driving efficiency, characterized in that after the power factor correction module is driven by the operating voltage, the pre-startup module enters a closed state.

2. The lighting device having a multi-stage chip power supply mechanism for improving driving efficiency according to claim 1 , wherein the voltage extraction unit is a transformer.

3. 2. The lighting device having a multi-stage chip power supply mechanism for improving driving efficiency according to claim 1, wherein the preliminary startup module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch, and a first diode, one end of the first resistor is connected to a first node, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to a negative electrode of the first switch and the first diode, the positive electrode of the first diode is connected to a second node, one end of the third resistor is connected to the first node, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to a second terminal of the first switch, and a third terminal of the first switch is connected to a third node, the first node and the second node are respectively connected to two output terminals of the rectifier module, and the third node is connected to a power supply pin of the power factor correction module.

4. 4. The lighting device having a multi-stage chip power supply mechanism for improving driving efficiency according to claim 3, wherein the second node is further connected to a ground.

5. 4. The lighting device having a multi-stage chip power supply mechanism for improving driving efficiency according to claim 3, wherein the auxiliary power supply module includes a second diode, a fifth resistor, and an operating voltage output terminal, the positive electrode of the second diode is connected to the voltage extraction unit, the negative electrode of the second diode is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the operating voltage output terminal, and the operating voltage output terminal is connected to the third node connection.

6. The lighting device having a multi-stage chip power supply mechanism for improving driving efficiency according to claim 1 , further comprising a filter module connected to an external power source and the rectifier module.

7. 2. The lighting device having a multi-stage chip power supply mechanism for improving driving efficiency according to claim 1, further comprising an input module, wherein the filter module is connected to an external power source via the input module.

8. The lighting device having a multi-stage chip power supply mechanism for improving driving efficiency according to claim 7 , further comprising a protection module disposed between the filter module and the input module.

9. The lighting device having a multi-stage chip power supply mechanism for improving driving efficiency according to claim 1 , wherein the power factor correction module is an active power factor correction circuit.

10. 2. The lighting device having a multi-stage chip power supply mechanism for improving driving efficiency according to claim 1, wherein the voltage conversion module is a step-down converter, a step-up converter, a step-up / step-down converter or a flyback converter.

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