LED driving circuit and LED driving power supply based on radio frequency anti-counterfeiting

Abstract

The utility model provides an LED driving circuit and an LED driving power supply based on radio frequency anti-counterfeiting. The LED driving circuit based on radio frequency anti-counterfeiting comprises a rectifying circuit, a radio frequency sampling circuit and a voltage transformation driving circuit, the radio frequency sampling circuit comprises a driving sampler, a radio frequency module, a first resistor, a first capacitor and a second capacitor; the voltage transformation driving circuit comprises a transformer and a driving output diode. After the radio frequency module is removed, the current feedback end of the driving sampler interrupts current sampling of the primary side of the transformer, so that the current change condition of the primary side of the transformer cannot be determined, signals of the zero current detection input end of the driving sampler are interrupted, and signals of the drain electrode output end of the driving sampler are also interrupted synchronously. Therefore, when the radio frequency module is removed, the transformer stops working, the supply of the driving voltage to the LED load is interrupted, the condition that the LED driving voltage continues to be output when the radio frequency module is removed is effectively avoided, and the anti-channel conflict grade is effectively improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of LED power supplies, and particularly to an LED driving circuit and an LED driving power supply based on radio frequency anti-counterfeiting. Background Art

[0002] Currently, with the development of the LED lighting industry, the competition between brand light source devices and circulating light source devices is becoming increasingly fierce, and phenomena such as counterfeit and shoddy products and cross-region sales have disrupted the market. In order to improve the anti-counterfeiting level, radio frequency identification technology is usually adopted. In the existing radio frequency identification technology, an RFID chip is implanted into the LED power supply, and key information such as production time, production serial number, and shipping area is written into the RFID chip. During market inspection, a dedicated reading and writing device is used to read the relevant information, so as to identify whether it is a genuine product and whether there is cross-region sales.

[0003] However, the traditional RFID chip traceability module and the LED driving module are independently arranged. After the RFID chip traceability module is removed, the LED power supply can still continue to work and output, resulting in the inability to identify the key information of the LED power supply, and further increasing the risk of cross-region sales of the LED power supply. Utility Model Content

[0004] An object of the present disclosure is to overcome the deficiencies in the prior art and provide an LED driving circuit and an LED driving power supply based on radio frequency anti-counterfeiting that can effectively improve the anti-cross-region sales level.

[0005] The object of the present disclosure is achieved by the following technical solutions:

[0006] An LED driving circuit based on radio frequency anti-counterfeiting, comprising: a rectifying circuit, a radio frequency sampling circuit, and a voltage transformation driving circuit; the input end of the rectifying circuit is used to connect to the mains power; the radio frequency sampling circuit includes a driving sampler, a radio frequency module, a first resistor, a first capacitor, and a second capacitor, a first end of the first resistor is connected to an output end of the rectifying circuit, a second end of the first resistor is grounded through the first capacitor, and the second end of the first resistor is further connected to a power supply end of the driving sampler; a current feedback end of the driving sampler is grounded through the radio frequency module, and a drain output end of the driving sampler is grounded through the second capacitor; the voltage transformation driving circuit includes a transformer and a driving output diode, a non - same - name end of a primary side of the transformer is connected to the output end of the rectifying circuit, a same - name end of the primary side of the transformer is connected to the drain output end of the driving sampler, a same - name end of a first secondary side of the transformer is connected to a positive electrode of the driving output diode, a negative electrode of the driving output diode is used to output an LED driving voltage, and a non - same - name end of the first secondary side of the transformer is connected to signal ground; a same - name end of a second secondary side of the transformer is connected to a zero - current detection input end of the driving sampler, and a non - same - name end of the second secondary side of the transformer is grounded.

[0007] In one embodiment, the radio frequency sampling circuit further includes a feedback sampling resistor, a current feedback end of the driving sampler is connected to a first end of the feedback sampling resistor, and a second end of the feedback sampling resistor is connected to a power supply end of the radio frequency module.

[0008] In one embodiment, the number of the feedback sampling resistors is two, and the two feedback sampling resistors are connected in parallel with each other.

[0009] In one embodiment, the radio frequency module includes a radio frequency anti - counterfeiting chip and a radio frequency antenna, a positive power supply of the radio frequency anti - counterfeiting chip is connected to a first end of the feedback sampling resistor, a negative power supply of the radio frequency anti - counterfeiting chip is grounded, and a reading and sensing end of the radio frequency anti - counterfeiting chip is connected to the radio frequency antenna.

[0010] In one embodiment, the feedback sampling resistor is an adjustable resistor.

[0011] In one embodiment, the radio frequency sampling circuit further includes a second resistor and a third resistor, a first end of the second resistor is connected to a same - name end of a second secondary side of the transformer, a second end of the second resistor is connected to a zero - current detection input end of the driving sampler, and the second end of the second resistor is further grounded through the third resistor.

[0012] In one embodiment, the RF sampling circuit further includes a power supply diode, the first end of the second resistor is connected to the anode of the power supply diode, and the cathode of the power supply diode is connected to the first end of the first resistor.

[0013] In one of the embodiments, the RF sampling circuit further includes a fourth resistor, and the output end of the rectifier circuit is connected to the cathode of the power supply diode through the fourth resistor.

[0014] In one embodiment, the first capacitor is an electrolytic capacitor.

[0015] An LED driving power supply comprises the LED driving circuit based on radio frequency anti-counterfeiting described in any one of the above embodiments.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] When the RF module is removed, the current feedback end of the driver sampler interrupts the current sampling on the primary side of the transformer, making it impossible to determine the current change on the primary side of the transformer, resulting in the interruption of the signal at the zero current detection input end of the driver sampler, which in turn causes the synchronous interruption of the drain output end signal of the driver sampler, and then causes the transformer to stop working, interrupting the provision of driving voltage to the LED load, effectively avoiding the situation where the LED driving voltage continues to be output when the RF module is removed, and effectively improving the anti-channelling level. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A circuit diagram of an LED driving circuit based on radio frequency anti-counterfeiting in one embodiment;

[0020] Figure 2 for Figure 1 Circuit diagram of the RF sampling circuit in the LED driving circuit based on RF anti-counterfeiting. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this disclosure pertains. The terms used herein in the description of this disclosure are for the purpose of describing specific implementations only and are not intended to limit this disclosure. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0024] This disclosure relates to an LED driving circuit based on radio frequency anti-counterfeiting. In one embodiment, the LED driving circuit based on radio frequency anti-counterfeiting includes a rectifying circuit, a radio frequency sampling circuit, and a voltage transformation driving circuit; the input end of the rectifying circuit is used to be connected to the mains; the radio frequency sampling circuit includes a driving sampler, a radio frequency module, a first resistor, a first capacitor, and a second capacitor. The first end of the first resistor is connected to the output end of the rectifying circuit, the second end of the first resistor is grounded through the first capacitor, and the second end of the first resistor is also connected to the power supply end of the driving sampler; the current feedback end of the driving sampler is grounded through the radio frequency module, and the drain output end of the driving sampler is grounded through the second capacitor; the voltage transformation driving circuit includes a transformer and a driving output diode. The non - same - name terminal of the primary side of the transformer is connected to the output end of the rectifying circuit, the same - name terminal of the primary side of the transformer is connected to the drain output end of the driving sampler, the same - name terminal of the first secondary side of the transformer is connected to the positive electrode of the driving output diode, the negative electrode of the driving output diode is used to output the LED driving voltage, and the non - same - name terminal of the first secondary side of the transformer is connected to the signal ground; the same - name terminal of the second secondary side of the transformer is connected to the zero - current detection input end of the driving sampler, and the non - same - name terminal of the second secondary side of the transformer is grounded. When the radio frequency module is removed, the current feedback end of the driving sampler interrupts the current sampling of the primary side of the transformer, making it impossible to determine the change situation of the current on the primary side of the transformer, resulting in the interruption of the signal at the zero - current detection input end of the driving sampler, thereby causing the signal at the drain output end of the driving sampler to be interrupted synchronously, and further causing the transformer to stop working and interrupt the supply of the driving voltage to the LED load, effectively avoiding the situation of continuously outputting the LED driving voltage when the radio frequency module is removed and effectively improving the anti - diversion level.

[0025] Please refer toFigure 1 , which is a schematic structural diagram of an LED driving circuit based on radio frequency anti-counterfeiting according to an embodiment of the present disclosure.

[0026] The LED driving circuit 10 based on radio frequency anti-counterfeiting according to an embodiment includes a rectifying circuit 100, a radio frequency sampling circuit 200, and a voltage transformation driving circuit 300. The input end of the rectifying circuit 100 is used to be connected to the commercial power. Please refer to Figure 2 , the radio frequency sampling circuit 200 includes a driving sampler U1, a radio frequency module 210, a first resistor R6, a first capacitor C4, and a second capacitor C3. The first end of the first resistor R6 is connected to the output end of the rectifying circuit 100, the second end of the first resistor R6 is grounded through the first capacitor C4, and the second end of the first resistor R6 is also connected to the power supply end of the driving sampler U1. The current feedback end of the driving sampler U1 is grounded through the radio frequency module 210, and the drain output end of the driving sampler U1 is grounded through the second capacitor C3. The voltage transformation driving circuit 300 includes a transformer T1 and a driving output diode D3. The non-homonymous end of the primary side of the transformer T1 is connected to the output end of the rectifying circuit 100, the homonymous end of the primary side T1A of the transformer T1 is connected to the drain output end of the driving sampler U1, the homonymous end of the first secondary side of the transformer T1 is connected to the positive electrode of the driving output diode D3, the negative electrode of the driving output diode D3 is used to output the LED driving voltage, and the non-homonymous end of the first secondary side of the transformer T1 is connected to the signal ground. The homonymous end of the second secondary side T1B of the transformer T1 is connected to the zero current detection input end of the driving sampler U1, and the non-homonymous end of the second secondary side of the transformer T1 is grounded.

[0027] In this embodiment, when the radio frequency module 210 is removed, the current feedback end of the driving sampler U1 interrupts the current sampling of the primary side of the transformer T1, making it impossible to determine the change of the current on the primary side of the transformer T1, resulting in the interruption of the signal at the zero current detection input end of the driving sampler U1, thereby causing the signal at the drain output end of the driving sampler U1 to be interrupted synchronously, and further causing the transformer T1 to stop working and interrupt the supply of the LED driving voltage, effectively avoiding the situation of continuously outputting the LED driving voltage when the radio frequency module 210 is removed, and effectively improving the anti-channel-hopping level.

[0028] In one of the embodiments, please refer to Figure 2, the RF sampling circuit 200 further includes a feedback sampling resistor Rs1. The current feedback terminal of the driving sampler U1 is connected to the first end of the feedback sampling resistor Rs1, and the second end of the feedback sampling resistor Rs1 is connected to the power supply terminal of the RF module 210. In this embodiment, the two ends of the feedback sampling resistor Rs1 are respectively connected to the current feedback terminal of the driving sampler U1 and the power supply terminal of the RF module 210. Specifically, the feedback sampling resistor Rs1 is connected in series between the current feedback terminal of the driving sampler U1 and the power supply terminal of the RF module 210. The voltage at the current feedback terminal of the driving sampler U1 is loaded onto the power supply terminal of the RF module 210 through the feedback sampling resistor Rs1, and when sampling the current condition of the primary side of the transformer T1, it also supplies power to the RF module 210.

[0029] In another embodiment, the number of the feedback sampling resistors Rs1 is two, and the two feedback sampling resistors Rs1 are connected in parallel with each other to limit the current flowing into the power supply terminal of the RF module 210.

[0030] Further, the RF module 210 includes an RF anti-counterfeiting chip U3 and an RF antenna LF1. The positive power supply terminal of the RF anti-counterfeiting chip U3 is connected to the first end of the feedback sampling resistor Rs1, the negative power supply terminal of the RF anti-counterfeiting chip U3 is grounded, and the read sensing terminal of the RF anti-counterfeiting chip U3 is connected to the RF antenna LF1. In this embodiment, the RF anti-counterfeiting chip U3 is used to store key information of the LED power supply, such as key information like production time, production serial number, shipping area, etc. The RF anti-counterfeiting chip U3 and the feedback sampling resistor Rs1 are connected in series at the current feedback terminal of the driving sampler U1. The normal operation of the RF anti-counterfeiting chip U3 is controlled by the voltage at the current feedback terminal of the driving sampler U1. After the RF anti-counterfeiting chip U3 is removed, the current feedback terminal of the driving sampler U1 is left floating, causing the driving sampler U1 to stop working, thereby causing the transformer T1 to stop working. Among them, the RF antenna LF1 is used to sense the card reader to facilitate reading the key information in the RF anti-counterfeiting chip U3.

[0031] In another embodiment, the feedback sampling resistor Rs1 is a variable resistor. By adjusting the resistance value of the feedback sampling resistor Rs1, it is convenient to be applicable to RF chips with different supply voltages.

[0032] In one of the embodiments, please refer to Figure 2The RF sampling circuit 200 further includes a second resistor R7 and a third resistor R8. The first end of the second resistor R7 is connected to the same-name end of the second secondary side of the transformer T1. The second end of the second resistor R7 is connected to the zero-current detection input end of the driving sampler U1. The second end of the second resistor R7 is also grounded through the third resistor R8. In this embodiment, the second resistor R7 and the third resistor R8 are connected in series and then connected in parallel to the second secondary side of the transformer T1. Specifically, the second resistor R7 and the third resistor R8 form a voltage-dividing circuit for zero-current detection. The voltage on the zero-current detection input end of the driving sampler U1 is the voltage divided by the third resistor R8. The output LED driving voltage of the transformer T1 is determined proportionally according to the voltage-dividing conditions of the second resistor R7 and the third resistor R8.

[0033] Furthermore, the RF sampling circuit 200 further includes a power supply diode D2. The first end of the second resistor R7 is connected to the positive electrode of the power supply diode D2. The negative electrode of the power supply diode D2 is connected to the first end of the first resistor R6. In this embodiment, the power supply diode D2 serves as a current output charging tube for the second secondary side of the transformer T1. The same-name end of the second secondary side of the transformer T1 is connected to the first end of the first resistor R6 through the power supply diode D2 to provide power compensation for the power supply end of the driving sampler U1, so that the driving sampler U1 operates stably.

[0034] In another embodiment, the RF sampling circuit 200 further includes a fourth resistor R4. The output end of the rectification circuit 100 is connected to the negative electrode of the power supply diode D2 through the fourth resistor R4. In this embodiment, the fourth resistor R4 and the first resistor R6 form a charging voltage-dividing circuit. The resistance ratio of the fourth resistor R4 to the first resistor R6 corresponds to the power supply voltage ratio of the driving sampler U1. By adjusting the resistance ratio of the fourth resistor R4 to the first resistor R6, it is convenient to adjust the voltage of the power supply end of the driving sampler U1.

[0035] In another embodiment, the first capacitor C4 is an electrolytic capacitor, that is, the first capacitor C4 is a capacitor with a large capacitance value. When the second secondary side of the transformer T1 provides voltage compensation for the driving sampler U1, the first capacitor C4 provides a relatively high pull-up voltage for the driving sampler U1 to ensure the stability of the power supply voltage of the driving sampler U1.

[0036] In one of the embodiments, the present disclosure also relates to an LED driving power supply, including the LED driving circuit based on radio frequency anti-counterfeiting described in any of the above embodiments. In this embodiment, the LED driving circuit based on radio frequency anti-counterfeiting includes a rectifier circuit, a radio frequency sampling circuit and a transformer driving circuit; the input end of the rectifier circuit is used to connect to the mains; the radio frequency sampling circuit includes a driving sampler, a radio frequency module, a first resistor, a first capacitor and a second capacitor, the first end of the first resistor is connected to the output end of the rectifier circuit, the second end of the first resistor is grounded through the first capacitor, and the second end of the first resistor is also connected to the power supply end of the driving sampler; the current feedback end of the driving sampler is grounded through the radio frequency module, and the drain output end of the driving sampler is connected through The second capacitor is grounded; the transformer drive circuit includes a transformer and a drive output diode, the primary side opposite-name terminal of the transformer is connected to the output end of the rectifier circuit, the primary side same-name terminal of the transformer is connected to the drain output end of the drive sampler, the first secondary side same-name terminal of the transformer is connected to the positive electrode of the drive output diode, the negative electrode of the drive output diode is used to output the LED drive voltage, and the first secondary side opposite-name terminal of the transformer is connected to the signal ground; the second secondary side same-name terminal of the transformer is connected to the zero current detection input end of the drive sampler, and the second secondary side opposite-name terminal of the transformer is grounded. When the RF module is removed, the current feedback end of the drive sampler interrupts the current sampling of the primary side of the transformer, making it impossible to determine the current change of the primary side of the transformer, resulting in the interruption of the signal of the zero current detection input end of the drive sampler, thereby causing the signal of the drain output end of the drive sampler to be interrupted synchronously, and then causing the transformer to stop working, interrupting the supply of drive voltage to the LED load, effectively avoiding the situation of continuing to output the LED drive voltage when the RF module is removed, and effectively improving the anti-channeling level.

[0037] The above-described embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present disclosure. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the attached claims.

Claims

1. An LED driving circuit based on radio frequency anti-counterfeiting, characterized in that, Comprising: A rectifying circuit, the input end of which is used to connect to the mains power supply; A radio frequency sampling circuit, which includes a driving sampler, a radio frequency module, a first resistor, a first capacitor, and a second capacitor. The first end of the first resistor is connected to the output end of the rectifying circuit. The second end of the first resistor is grounded through the first capacitor, and the second end of the first resistor is also connected to the power supply end of the driving sampler. The current feedback end of the driving sampler is grounded through the radio frequency module, and the drain output end of the driving sampler is grounded through the second capacitor; A voltage transformation driving circuit, which includes a transformer and a driving output diode. The non - same - name terminal of the primary side of the transformer is connected to the output end of the rectifying circuit, and the same - name terminal of the primary side of the transformer is connected to the drain output end of the driving sampler. The same - name terminal of the first secondary side of the transformer is connected to the positive electrode of the driving output diode, and the negative electrode of the driving output diode is used to output the LED driving voltage. The non - same - name terminal of the first secondary side of the transformer is connected to the signal ground. The same - name terminal of the second secondary side of the transformer is connected to the zero - current detection input end of the driving sampler, and the non - same - name terminal of the second secondary side of the transformer is grounded.

2. The LED driving circuit based on radio frequency anti-counterfeiting according to claim 1, wherein The radio frequency sampling circuit further includes a feedback sampling resistor. The current feedback end of the driving sampler is connected to the first end of the feedback sampling resistor, and the second end of the feedback sampling resistor is connected to the power supply end of the radio frequency module.

3. The LED driving circuit based on radio frequency anti-counterfeiting according to claim 2, characterized in that, The number of the feedback sampling resistors is two, and the two feedback sampling resistors are connected in parallel with each other.

4. The LED driving circuit based on radio frequency anti-counterfeiting according to claim 2, wherein, The radio frequency module includes a radio frequency anti - counterfeiting chip and a radio frequency antenna. The positive power supply terminal of the radio frequency anti - counterfeiting chip is connected to the first end of the feedback sampling resistor, the negative power supply terminal of the radio frequency anti - counterfeiting chip is grounded, and the reading and sensing end of the radio frequency anti - counterfeiting chip is connected to the radio frequency antenna.

5. The LED driving circuit based on radio frequency anti-counterfeiting according to claim 2, wherein The feedback sampling resistor is an adjustable resistor.

6. The LED driving circuit based on radio frequency anti-counterfeiting according to claim 1, characterized in that The radio frequency sampling circuit further includes a second resistor and a third resistor. The first end of the second resistor is connected to the same - name terminal of the second secondary side of the transformer, the second end of the second resistor is connected to the zero - current detection input end of the driving sampler, and the second end of the second resistor is also grounded through the third resistor.

7. The LED driving circuit based on radio frequency anti-counterfeiting according to claim 6, wherein The radio frequency sampling circuit further includes a power supply diode. The first end of the second resistor is connected to the positive electrode of the power supply diode, and the negative electrode of the power supply diode is connected to the first end of the first resistor.

8. The LED driving circuit based on radio frequency anti-counterfeiting according to claim 7, wherein The radio frequency sampling circuit further includes a fourth resistor. The output end of the rectifying circuit is connected to the negative electrode of the power supply diode through the fourth resistor.

9. The LED driving circuit based on radio frequency anti-counterfeiting according to claim 1, characterized in that, The first capacitor is an electrolytic capacitor.

10. An LED driving power supply, characterized in that, Including the LED driving circuit based on radio frequency anti - counterfeiting according to any one of claims 1 to 9.

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