A flicker detection circuit, PCB board and driving power supply
By designing a flicker detection circuit, abnormal problems can be detected and the lights can be turned off in time, thus solving the problem of light flickering caused by the driver power supply, reducing the workload and cost of manual inspection, and expanding the applicable range of the lights.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- KEGU INTELLIGENT TECHNOLOGY CO LTD
- Filing Date
- 2023-06-12
- Publication Date
- 2026-07-07
AI Technical Summary
Existing driver power supplies may cause lamps to flicker when the lamp beads are open-circuited or malfunctioning, resulting in a large workload and high cost for manual inspection.
A flicker detection circuit was designed, including an input processing unit, an output unit, a main control unit, a power supply unit, and a flicker detection unit. The flicker detection unit detects abnormal problems and feeds them back to the main control unit, which then stops outputting voltage to turn off the lamp, thus achieving immediate shutdown.
It enables the timely shutdown of lights that are about to flicker, reducing the workload and cost of manual inspections and expanding the applicability of the lights.
Smart Images
Figure CN116847512B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of power supply technology, and in particular to a flicker detection circuit, a PCB board, and a driving power supply. Background Technology
[0002] If the output LED beads are open-circuited or have other abnormal problems during operation, the existing driver power supply may cause the lamps connected to the driver power supply to flicker. For some application scenarios where flickering is not allowed, additional personnel need to be assigned to conduct regular inspections to turn off the lamps that may flicker in time, so as to avoid negative environmental impacts caused by flickering. Manual inspection is labor-intensive and costly.
[0003] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention
[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a flicker detection circuit that can detect flicker and promptly shut off lamps that are about to flicker.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A flicker detection circuit includes an input processing unit, an output unit, a main control unit, a power supply unit, and a flicker detection unit. The input terminal of the input processing unit is connected to an external power supply. The output terminal of the input processing unit is connected to the input terminal of the output unit, the power supply terminal of the main control unit, and the input terminal of the power supply unit. The output terminal of the power supply unit is connected to the power supply terminal of the flicker detection unit. The input terminal of the flicker detection unit is connected to the output unit. The output terminal of the flicker detection unit is connected to the detection terminal of the main control unit. The output terminal of the main control unit is connected to the input processing unit.
[0007] The flicker detection circuit also includes a power factor correction unit, which is electrically connected to the input processing unit and the main control unit.
[0008] In the flicker detection circuit, the power factor correction unit includes a second control chip U2, a fourth resistor R4, a fifth resistor R5, and a second capacitor C2. Pins 5 to 8 and pin 1 of the second control chip U2 are connected to the input processing unit. Pin 3 of the second control chip U2 is connected to the power supply terminal of the main control unit and one end of the second capacitor C2. Pin 4 of the second control chip U2 is connected to one end of the fourth resistor R4 and one end of the fifth resistor R5. The other ends of the fourth resistor R4, the fifth resistor R5, the second capacitor C2, and pin 2 of the second control chip U2 are grounded.
[0009] In the flicker detection circuit, the input processing unit includes a first connector CN1, a first filter section, a rectifier section, a second filter section, and the primary winding of a first transformer T1. The first connector CN1 is used to connect to an external power supply. The first connector CN1 is also connected to the input terminal of the first filter section. The output terminal of the first filter section is connected to the input terminal of the rectifier section. The output terminal of the rectifier section is connected to the input terminal of the second filter section. The output terminal of the second filter section is connected to the primary winding of the first transformer T1. The primary winding of the first transformer T1 is also inductively connected to the input terminal of the output unit, the power supply terminal of the main control unit, and the input terminal of the power supply unit.
[0010] In the flicker detection circuit, the output unit includes the primary winding of the first transformer T1, the third filter section, and the second connector CN2. The primary winding of the first transformer T1 is inducedly connected to the output terminal of the input processing unit. The primary winding of the first transformer T1 is also connected to the input terminal of the third filter section. The output terminal of the third filter section is connected to pin 1 and pin 2 of the second connector CN2. Pin 2 of the second connector CN2 is also connected to the input terminal of the flicker detection unit.
[0011] In the aforementioned flicker detection circuit, the flicker detection unit includes a 30th resistor R30, a 39th resistor R39, a 41st resistor R41, an 8th diode D8, the transmitter of an optocoupler U3, a 5th control chip U5, and a signal amplifier U7. One end of the 30th resistor R30 is connected to the output of the 3rd filter section, and the other end of the 30th resistor R30 is connected to one end of the 41st resistor R41 and pin 2 of the 2nd connector CN2. The other end of the 41st resistor R41 is connected to pin 1 of the signal amplifier U7. Pin 4 of the signal amplifier U7 is connected to pin 4 of the 5th control chip U5, and pin 5 of the 5th control chip U5 is connected to the negative terminal of the 8th diode D8. One end of the 30th resistor R30 is connected to the output of the power supply unit, and the other end of the 30th resistor R30 is connected to the transmitter of the optocoupler U3 via the positive terminal of the 8th diode D8.
[0012] In the flicker detection circuit, the power supply unit includes four control chips U4 and the second winding of the first transformer T1. The second winding of the first transformer T1 is induced to the output terminal of the input processing unit. Pin 5 of the second winding of the first transformer T1 is connected to pin 1 of the fourth control chip U4. Pin 3 of the fourth control chip U4 is connected to one end of the thirtieth resistor R30, pin 1 of the fifth control chip U5, and pin 5 of the signal amplifier U7, respectively. Pin 6 of the second winding of the first transformer T1 and pin 2 of the fourth control chip U4 are grounded.
[0013] In the flicker detection circuit, the main control unit includes a first control chip U1, an auxiliary winding of a first transformer T1, a receiving end of an optocoupler U3, a thyristor U6, a tenth resistor R10, and a second transistor Q2. The auxiliary winding of the first transformer T1 is inducedly connected to the input processing unit. Pin 7 of the auxiliary winding of the first transformer T1 is connected to pin 3 of the first control chip U3, pin T2 of the thyristor U6, and the receiving end of the optocoupler U3, respectively. The receiving end of the optocoupler U3 is inducedly connected to the transmitting end of the optocoupler U3. The optocoupler U3 is also connected to pin G of the thyristor U6. Pin T1 of the thyristor U6 is connected to one end of the tenth resistor R10 and the base of the second transistor Q2, respectively. The collector of the second transistor Q2 is connected to pin 2 of the first control chip U1. The other end of the tenth resistor R10 and the emitter of the second transistor Q2 are grounded.
[0014] The present invention also provides a PCB board having the flicker detection circuit described above printed on it.
[0015] The present invention also provides a driving power supply, including a housing, wherein the PCB board as described above is disposed inside the housing.
[0016] Beneficial effects:
[0017] This invention provides a flicker detection circuit, including a flicker detection unit. When the flicker detection unit detects an output abnormality, such as an output abnormality caused by an open circuit in the LED, the flicker detection unit feeds back the abnormal signal to the main control unit. The main control unit then stops outputting, meaning the flicker detection circuit stops outputting voltage, causing the lamp connected to the driving power supply to stop working. This achieves timely shutdown of lamps that are about to flicker, making the lamps suitable for applications where flickering is not allowed, thus improving the applicability of the lamps. Attached Figure Description
[0018] Figure 1 A circuit block diagram of the flicker detection circuit provided by the present invention;
[0019] Figure 2 A circuit diagram of the flicker detection circuit provided by the present invention;
[0020] Figure 3 The circuit structure diagram of the flicker detection unit, output unit and main control unit provided by the present invention.
[0021] Explanation of key component symbols: 1-Input processing unit, 2-Output unit, 3-Main control unit, 4-Power supply unit, 5-Flicker detection unit, 6-Power factor correction unit. Detailed Implementation
[0022] This invention provides a flicker detection circuit, a PCB board, and a driving power supply. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.
[0023] In the description of this invention, it should be understood that the terms "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0024] Please see Figures 1 to 3This invention provides a flicker detection circuit, including an input processing unit 1, an output unit 2, a main control unit 3, a power supply unit 4, and a flicker detection unit 5. The input terminal of the input processing unit 1 is used to connect to an external power supply, and the output terminal of the input processing unit 1 is connected to the input terminal of the output unit 2, the power supply terminal of the main control unit 3, and the input terminal of the power supply unit 4, respectively. The output terminal of the power supply unit 4 is connected to the power supply terminal of the flicker detection unit 5, the input terminal of the flicker detection unit 5 is connected to the output unit 2, the output terminal of the flicker detection unit 5 is connected to the detection terminal of the main control unit 3, and the output terminal of the main control unit 3 is connected to the input processing unit 1.
[0025] This application discloses a flicker detection circuit, including a flicker detection unit 5. When the flicker detection unit 5 detects an output abnormality, such as an output abnormality caused by an open circuit in the LED, the flicker detection unit 5 feeds back the abnormal signal to the main control unit 3. The main control unit 3 stops outputting, that is, the flicker detection circuit stops outputting voltage, causing the lamp connected to the driving power supply to stop working. This realizes the timely shutdown of the lamp that is about to flicker, making the lamp suitable for applications where flickering is not allowed, and improving the applicability of the lamp.
[0026] Further, please refer to Figure 1 and Figure 2 The flicker detection circuit further includes a power factor correction unit 6, which is electrically connected to the input processing unit 1 and the main control unit 3.
[0027] Further, please refer to Figure 2 The power factor correction unit 6 includes a second control chip U2, a fourth resistor R4, a fifth resistor R5, and a second capacitor C2. Pins 5 to 8 and pin 1 of the second control chip U2 are connected to the input processing unit 1. Pin 3 of the second control chip U2 is connected to the power supply terminal of the main control unit 3 and one end of the second capacitor C2. Pin 4 of the second control chip U2 is connected to one end of the fourth resistor R4 and one end of the fifth resistor R5. The other ends of the fourth resistor R4, the fifth resistor R5, the second capacitor C2, and pin 2 of the second control chip U2 are grounded. In this embodiment, the model of the second control chip U2 is SD7523S.
[0028] Further, please refer to Figure 2The input processing unit 1 includes a first connector CN1, a first filter section, a rectifier section, a second filter section, and the primary winding of a first transformer T1. The first connector CN1 is used to connect to an external power supply. The first connector CN1 is also connected to the input terminal of the first filter section. The output terminal of the first filter section is connected to the input terminal of the rectifier section. The output terminal of the rectifier section is connected to the input terminal of the second filter section. The output terminal of the second filter section is connected to the primary winding of the first transformer T1. The primary winding of the first transformer T1 is also inductively connected to the input terminal of the output unit 2, the power supply terminal of the main control unit 3, and the input terminal of the power supply unit 4.
[0029] In one embodiment, see Figure 2 The first filtering section includes a first filter LF1 and a second filter LF2. The rectifier section includes a rectifier bridge BD1. The second filtering section includes a first diode D1, a second diode D2, and a first filter capacitor CE1. The input terminal of the first filter LF1 is connected to pins 1 and 2 of the first connector CN1. The output terminal of the first filter LF1 is connected to the input terminal of the second filter LF2. The output terminal of the second filter LF2 is connected to pins 2 and 4 of the rectifier bridge BD1. Pin 1 of the rectifier bridge BD1 is grounded. Pin 3 of the rectifier bridge BD1 is connected to the anode of the first diode D1 and the anode of the second diode D2. The cathodes of the first diode D1 and the second diode D2 are connected to pin 1 of the primary winding of the first transformer T1 and pin 5 of the first control chip U1, respectively. The cathode of the second diode D2 is also connected to one end of the first filter capacitor CE1, and the anode of the second diode D2 is also connected to pins 5 to 8 of the second control chip U2. The other end of the first filter capacitor CE1 is grounded.
[0030] Further, please refer to Figure 2 and Figure 3 The output unit 2 includes a primary winding of a first transformer T1, a third filter section, and a second connector CN2. The primary winding of the first transformer T1 is inductively connected to the output terminal of the input processing unit 1. The primary winding of the first transformer T1 is also connected to the input terminal of the third filter section. The output terminal of the third filter section is connected to pin 1 and pin 2 of the second connector CN2. Pin 2 of the second connector CN2 is also connected to the input terminal of the flicker detection unit 5.
[0031] In one embodiment, the third filtering section includes a third filter LF3, the input terminal of which is connected to pins 3 and 4 of the primary winding of the first transformer T1, and the output terminal of which is connected to pins 1 and 2 of the second connector CN2.
[0032] Further, please refer to Figure 2 and Figure 3 The flicker detection unit 5 includes a thirtieth resistor R30, a thirty-ninth resistor R39, a forty-first resistor R41, an eighth diode D8, the transmitter of an optocoupler U3, a fifth control chip U5, and a signal amplifier U7. One end of the thirtieth resistor R30 is connected to the output of the third filter section, and the other end of the thirtieth resistor R30 is connected to one end of the forty-first resistor R41 and pin 2 of the second connector CN2. The other end of the forty-first resistor R41 is connected to pin 1 of the signal amplifier U7. Pin 4 is connected to pin 4 of the fifth control chip U5, and pin 5 of the fifth control chip U5 is connected to the negative terminal of the eighth diode D8; one end of the thirtieth resistor R30 is connected to the output terminal of the power supply unit 4, and the other end of the thirtieth resistor R30 is connected to the emitter terminal of the optocoupler U3 via the positive terminal of the eighth diode D8; in one embodiment, the optocoupler U3 is a PC817, the fifth control chip U5 is a TR151, and the signal amplifier U7 is an LM321M5X / TR.
[0033] Further, please refer to Figure 2 and Figure 3 The power supply unit 4 includes four control chips U4 and the second winding of the first transformer T1. The second winding of the first transformer T1 is inducedly connected to the output terminal of the input processing unit 1. The pin 5 of the second winding of the first transformer T1 is connected to the pin 1 of the fourth control chip U4. The pin 3 of the fourth control chip U4 is connected to one end of the thirtieth resistor R30, the pin 1 of the fifth control chip U5, and the pin 5 of the signal amplifier U7, respectively. The pin 6 of the second winding of the first transformer T1 and the pin 2 of the fourth control chip U4 are grounded. In one embodiment, the fourth control chip U4 is model CE6275A.
[0034] Further, please refer to Figure 2 and Figure 3The main control unit 3 includes a first control chip U1, an auxiliary winding of a first transformer T1, a receiving end of an optocoupler U3, a thyristor U6, a tenth resistor R10, and a second transistor Q2. The auxiliary winding of the first transformer T1 is inducedly connected to the input processing unit 1. Pin 7 of the auxiliary winding of the first transformer T1 is connected to pin 3 of the first control chip U3, pin T2 of the thyristor U6, and the receiving end of the optocoupler U3, respectively. The receiving end of the optocoupler U3 is inducedly connected to the transmitting end of the optocoupler U3. The optocoupler U3 is also connected to pin G of the thyristor U6. Pin T1 of the thyristor U6 is connected to one end of the tenth resistor R10 and the base of the second transistor Q2, respectively. The collector of the second transistor Q2 is connected to pin 2 of the first control chip U1. The other end of the tenth resistor R10 and the emitter of the second transistor Q2 are grounded. In one embodiment, the first control chip U1 is model U-BP3187E.
[0035] The flicker detection circuit disclosed in this application, in actual operation, when the lamp connected to the driving power supply is working normally, that is, when the flicker detection circuit is in normal output state, the 39th resistor R39 flows with normal current, which is transmitted to the input terminal of the signal amplifier U7 through the 41st resistor R41. The current is amplified proportionally to pin 3 of the signal amplifier U7 for output. Pin 4 of the signal amplifier U7 outputs a high potential to the fifth control chip U5. When the fifth control chip U5 receives the high potential, it does not need to perform any action output after internal comparison. At this time, pin 5 of the fifth control chip U5 is still at a low potential, the eighth diode D8 is turned on, pulling down the voltage from the 30th resistor R30. The optocoupler U3 is not turned on, the flicker detection unit 5 does not feed back a signal to the main control unit 3, the main control unit 3 works normally, and the flicker detection circuit outputs a normal voltage signal to the lamp connected to the driving power supply.
[0036] Conversely, when a lamp connected to the driver power supply malfunctions, i.e., when it flashes abnormally, the thirty-ninth resistor R39 will generate intermittent current. This current signal is then fed back to the input of signal amplifier U7 via the forty-first resistor R41, i.e., to pin 1 of signal amplifier U7. This current is amplified proportionally to pin 3 of signal amplifier U7 for output. Pin 4 of signal amplifier U7 outputs a pulse signal, which is then sent to the fifth control chip U5. When the fifth control chip U5 receives the pulse signal, it compares internally and outputs a high potential. At this time, the eighth diode D8 is not conducting. Therefore, the thirty-ninth resistor... The voltage output from resistor R30 can cause optocoupler U3 to conduct, thereby triggering the thyristor U6 to conduct. When thyristor U6 conducts, the voltage on the tenth resistor R10 rises to 0.6V. At this time, the second transistor Q2 conducts, pulling the ROVP pin (pin 2) of the first control chip U1 low to ground. The first control chip U1 will then shut down its output to turn off the lamp connected to the drive power supply. This achieves timely shutdown of the flickering lamp, thus avoiding lamp flickering and making the lamp suitable for applications where lamp flickering is not allowed. This improves the flexibility of use and expands the scope of application.
[0037] The present invention also provides a PCB board having the flicker detection circuit described above printed on it.
[0038] The present invention also provides a driving power supply, including a housing, wherein the PCB board as described above is disposed inside the housing.
[0039] It is understood that those skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.
Claims
1. A flicker detection circuit, characterized in that, It includes an input processing unit, an output unit, a main control unit, a power supply unit, and a flicker detection unit; the input terminal of the input processing unit is used to connect to an external power supply, and the output terminal of the input processing unit is connected to the input terminal of the output unit, the power supply terminal of the main control unit, and the input terminal of the power supply unit; the output terminal of the power supply unit is connected to the power supply terminal of the flicker detection unit, the input terminal of the flicker detection unit is connected to the output unit, the output terminal of the flicker detection unit is connected to the detection terminal of the main control unit, and the output terminal of the main control unit is connected to the input processing unit; The output unit includes a primary winding of a first transformer T1, a third filter section, and a second connector CN2. The primary winding of the first transformer T1 is inductively connected to the output terminal of the input processing unit. The primary winding of the first transformer T1 is also connected to the input terminal of the third filter section. The output terminal of the third filter section is connected to pin 1 and pin 2 of the second connector CN2. Pin 2 of the second connector CN2 is also connected to the input terminal of the flicker detection unit. The flicker detection unit includes a 30th resistor R30, a 39th resistor R39, a 41st resistor R41, an 8th diode D8, the transmitter of an optocoupler U3, a 5th control chip U5, and a signal amplifier U7. One end of the 30th resistor R30 is connected to the output of the 3rd filter section, and the other end of the 30th resistor R30 is connected to one end of the 41st resistor R41 and pin 2 of the 2nd connector CN2. The other end of the 41st resistor R41 is connected to pin 1 of the signal amplifier U7. Pin 4 of the signal amplifier U7 is connected to pin 4 of the 5th control chip U5, and pin 5 of the 5th control chip U5 is connected to the negative terminal of the 8th diode D8. One end of the 30th resistor R30 is connected to the output of the power supply unit, and the other end of the 30th resistor R30 is connected to the transmitter of the optocoupler U3 via the positive terminal of the 8th diode D8. When the flicker detection unit detects an output abnormality, it sends an abnormal signal to the main control unit, which then stops outputting, thus enabling the timely shutdown of lights that are about to flicker.
2. The flicker detection circuit according to claim 1, characterized in that, It also includes a power factor correction unit, which is electrically connected to the input processing unit and the main control unit, respectively.
3. The flicker detection circuit according to claim 2, characterized in that, The power factor correction unit includes a second control chip U2, a fourth resistor R4, a fifth resistor R5, and a second capacitor C2. Pins 5 to 8 and pin 1 of the second control chip U2 are connected to the input processing unit. Pin 3 of the second control chip U2 is connected to the power supply terminal of the main control unit and one end of the second capacitor C2. Pin 4 of the second control chip U2 is connected to one end of the fourth resistor R4 and one end of the fifth resistor R5. The other ends of the fourth resistor R4, the fifth resistor R5, the second capacitor C2, and pin 2 of the second control chip U2 are grounded.
4. The flicker detection circuit according to claim 1, characterized in that, The input processing unit includes a first connector CN1, a first filter section, a rectifier section, a second filter section, and the primary winding of a first transformer T1. The first connector CN1 is used to connect to an external power supply. The first connector CN1 is also connected to the input terminal of the first filter section. The output terminal of the first filter section is connected to the input terminal of the rectifier section. The output terminal of the rectifier section is connected to the input terminal of the second filter section. The output terminal of the second filter section is connected to the primary winding of the first transformer T1. The primary winding of the first transformer T1 is also inductively connected to the input terminal of the output unit, the power supply terminal of the main control unit, and the input terminal of the power supply unit.
5. A flicker detection circuit according to claim 1, characterized in that, The power supply unit includes a fourth control chip U4 and the second winding of a first transformer T1. The second winding of the first transformer T1 is induced to be connected to the output terminal of the input processing unit. Pin 5 of the second winding of the first transformer T1 is connected to pin 1 of the fourth control chip U4. Pin 3 of the fourth control chip U4 is connected to one end of the thirtieth resistor R30, pin 1 of the fifth control chip U5, and pin 5 of the signal amplifier U7, respectively. Pin 6 of the second winding of the first transformer T1 and pin 2 of the fourth control chip U4 are grounded.
6. A flicker detection circuit according to claim 1, characterized in that, The main control unit includes a first control chip U1, an auxiliary winding of a first transformer T1, a receiving end of an optocoupler U3, a thyristor U6, a tenth resistor R10, and a second transistor Q2. The auxiliary winding of the first transformer T1 is inducedly connected to the input processing unit. Pin 7 of the auxiliary winding of the first transformer T1 is connected to pin 3 of the first control chip U3, pin T2 of the thyristor U6, and the receiving end of the optocoupler U3, respectively. The receiving end of the optocoupler U3 is inducedly connected to the transmitting end of the optocoupler U3. The optocoupler U3 is also connected to pin G of the thyristor U6. Pin T1 of the thyristor U6 is connected to one end of the tenth resistor R10 and the base of the second transistor Q2, and the collector of the second transistor Q2 is connected to pin 2 of the first control chip U1. The other end of the tenth resistor R10 and the emitter of the second transistor Q2 are grounded.
7. A PCB board, characterized in that, The PCB board is printed with a flicker detection circuit as described in any one of claims 1-6.
8. A driving power supply, comprising a housing, characterized in that, The housing contains the PCB board as described in claim 7.