External power supply with load impedance matching detection function

Abstract

To provide an external power supply feeder having a load impedance matching detection function.SOLUTION: An external power supply feeder comprises a rectifier module, a power factor correction module, an insulation power supply module, a voltage conversion module, a load impedance matching detection module, and a control module. The rectifier module is connected to an external power supply; the power factor correction module is connected to the rectifier module; the insulation power supply module is connected to the rectifier module and the power factor correction module; and the voltage conversion module is connected to the power factor correction module to comprise positive and negative electrodes. The load impedance matching detection module connected to a positive electrode output terminal generates a detection voltage by detecting an input terminal of an illumination device, when a positive electrode output terminal and a negative electrode output terminal are connected to the illumination device. The control module comprises a first detection pin for receiving the detection voltage, and a control pin connected to the insulation power supply module. The control module controls the insulation power supply module with the control pin, based on the detection voltage.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an external power supply designed for a power supply, particularly for a lighting device, and having a load impedance matching detection function.

Background Art

[0002] With the progress of technology, the performance of light-emitting diode lighting devices has also been significantly improved. Light-emitting diode lighting devices have many advantages such as energy saving, high efficiency, and long life. Most light-emitting diode lighting devices use an external power supply. However, since the manufacturer of the external power supply may be different from the manufacturer of the light-emitting diode lighting device, there is a possibility that the external power supply does not match the light-emitting diode lighting device, and many problems may occur. For example, the power of the external power supply may not match the light-emitting diode lighting fixture. For example, the light-emitting diode lighting fixture may cause overheating or insufficient brightness. Therefore, how to ensure the compatibility between the external power supply and the light-emitting diode lighting device has become an urgent issue.

Summary of the Invention

Problems to be Solved by the Invention

[0003] An object of the present invention is to provide an external power supply having a load impedance matching detection function.

Means for Solving the Problems

[0004] An external power supply with a load impedance matching detection function is provided based on one embodiment of the present invention, including a rectifier module, a power factor correction module, an isolated power supply module, a voltage conversion module, a load impedance matching detection module, and a control module. The rectifier module is connected to an external power supply. The power factor correction module is connected to the rectifier module. The isolated power supply module is connected to the rectifier module and the power factor correction module. The voltage conversion module is connected to the power factor correction module and has a positive output terminal and a negative output terminal. The load impedance matching detection module is connected to the positive output terminal and detects the input terminal of a lighting device and generates a detection voltage when the positive output terminal and the negative output terminal are connected to a lighting device. The control module has a first detection pin and a control pin. The control pin is connected to the isolated power supply module. The first detection pin is connected to the load impedance matching detection module and receives the detection voltage. The control module controls the isolated power supply module via the control pin based on the detection voltage.

[0005] In one embodiment, the control module generates a start signal to start the isolated power supply module when the detected voltage is within the preset voltage range, and generates an off signal to turn off the isolated power supply module when the detected voltage is outside the preset voltage range.

[0006] In one embodiment, after the isolated power supply module is started up, the control module stops receiving the detection voltage from the first detection pin.

[0007] In one embodiment, the external power supply further includes a load current detection module. The control module further has a second detection pin. The load current detection module is connected to a negative output terminal, which is connected to the second detection pin. The load current detection module detects the input terminal of the lighting device after the isolated power module is started and generates a detection current. The second detection pin is used to receive the detection current, and the control module is used to control the isolated power module via the control pin based on the detection current.

[0008] In one embodiment, the control module generates an off signal when the detected current is not within a preset current range, turns off the isolated power supply module, and receives the detected voltage via the first detection pin.

[0009] In one embodiment, the load current detection module includes a first resistor.

[0010] In one embodiment, the isolated power supply module has a grounding terminal. The load current detection module is connected to the grounding terminal.

[0011] In one embodiment, the load impedance matching detection module includes a second resistor, a diode, and a voltage detection point. The isolated power supply module has an operating voltage supply terminal. One end of the second resistor is connected to the operating voltage supply terminal, and the other end of the second resistor is connected to the voltage detection point. The voltage detection point is connected to the first detection pin and the positive terminal of the diode. The negative terminal of the diode is connected to the positive output terminal.

[0012] In one embodiment, after the positive output terminal and the negative output terminal are connected to the lighting device, the second resistor, the diode, the positive output terminal, the input resistor of the lighting device, and the negative output terminal form a voltage detection loop.

[0013] In one embodiment, the control module further has power supply pins. The power supply pins are connected to the operating voltage supply terminals. [Effects of the Invention]

[0014] Based on the above, the external power supply equipped with a load impedance matching detection function disclosed in the present invention may have one or more of the following advantages. (1) In one embodiment of the present invention, an external power supply is provided that includes a load impedance matching detection function, comprising a rectifier module, a power factor correction module, an isolated power supply module, a voltage conversion module, a load impedance matching detection module, and a control module. The rectifier module is connected to an external power supply. The power factor correction module is connected to the rectifier module. The isolated power supply module is connected to the rectifier module and the power factor correction module. The voltage conversion module is connected to the power factor correction module and has a positive output terminal and a negative output terminal. The load impedance matching detection module is connected to the positive output terminal and detects the input terminal of a lighting device and generates a detection voltage when the positive output terminal and the negative output terminal are connected to a lighting device. The control module has a first detection pin and a control pin. The control pin is connected to the isolated power supply module. The first detection pin is connected to the load impedance matching detection module and receives the detection voltage. The control module controls the isolated power supply module via the control pin based on the detection voltage. The control module generates a start signal to activate the isolated power supply module when the detected voltage is within the preset voltage range, and generates an off signal to turn off the isolated power supply module when the detected voltage is outside the preset voltage range. The load impedance matching detection mechanism described above ensures impedance matching between the external power supply and the lighting device, enabling both the external power supply and the lighting device to achieve high performance. (2) In one embodiment of the present invention, the load impedance matching detection module has a special circuit design, and after connecting the voltage conversion module to the input terminal of the lighting device, the load impedance matching detection module of the external power supply and the input resistance of the lighting device automatically form a high-precision voltage detection loop. In this way, the load impedance matching detection module accurately generates a detection voltage and can tell the control module whether the lighting device and the external power supply have achieved impedance matching. Thus, the external power supply can achieve high detection accuracy and meet the needs of actual applications. (3) In one embodiment of the present invention, the external power supply further includes a load current detection module. The control module has a second detection pin, the load current detection module is connected to a negative output terminal, and the negative output terminal is connected to the second detection pin. After the isolated power module is started up, the load current detection module detects the input terminal of the lighting device and generates a detection current, the second detection pin receives the detection current, and the control module controls the isolated power module via the control pin according to the detection current. When the detection current is not within the preset current range, the control module generates an off signal to turn off the isolated power module and receives the detection voltage again via the first detection pin. As can be seen from the above, after the isolated power module is started up, the load current detection module can continue to detect the input current of the load, allowing the control module to determine whether the lighting device (load) is abnormal based on the input current, and to re-execute the load impedance matching detection mechanism in the event of an abnormality in the lighting device. The aforementioned load current / load voltage detection switching matching mechanism effectively ensures that both the lighting device and the external power supply operate normally, reducing the risk of electric shock to the user due to an open circuit in the lighting device. Therefore, it effectively improves the safety of the external power supply. (4) In one embodiment of the present invention, the circuit design of the external power supply can also be applied to light-emitting diode lighting devices, and high efficiency can be achieved. Thus, the external power supply can adapt to future development trends, further broaden the applications of the external power supply, make its use more flexible, and meet environmental protection requirements. (5) In one embodiment of the present invention, the circuit design of the external power supply is simple, so the desired effect can be obtained without significantly increasing the cost. Therefore, the external power supply can achieve very high practicality and meet the requirements of different responses. [Brief explanation of the drawing]

[0015] [Figure 1] This is a block diagram of the circuit configuration of an external power supply with a load impedance matching detection function according to one embodiment of the present invention. [Figure 2] This is a circuit diagram of an external power supply with a load impedance matching detection function according to another embodiment of the present invention. [Figure 3] This is an explanatory diagram illustrating the usage state of an external power supply equipped with a load impedance matching detection function according to another embodiment of the present invention. [Modes for carrying out the invention]

[0016] The following embodiments describe the detailed features and advantages of the present invention, which are sufficient to enable those skilled in the art to understand and implement the technical aspects of the invention, and which, through the disclosures, claims, and drawings herein, will be readily understood by those skilled in the art.

[0017] The following describes embodiments of the external power supply with load impedance matching detection function of the present invention, with reference to the relevant drawings. For clarity and ease of illustration, the dimensions and proportions of the components in the drawings may be exaggerated or reduced. In the following description and / or claims, when a component is described as “connected” or “coupled” to another component, it may be a direct connection or coupling to that other component, or there may be an intermediary component. When a component is described as “directly connected” or “directly coupled” to another component, there is no intermediary component, and other terms used to describe relationships between components or layers should be interpreted similarly. For ease of understanding, the same components in the following embodiments are denoted by the same reference numerals.

[0018] Figure 1 is a block diagram of the circuit configuration of an external power supply with load impedance matching detection function according to one embodiment of the present invention. As shown in the figure, the external power supply 1 includes a filter module 11, a rectifier module 12, a power factor correction module 13, an isolated power supply module 14, a voltage conversion module 15, a load impedance matching detection module 16, a load current detection module 17, and a control module 18.

[0019] The filter module 11 is connected to an external power supply PS. In one embodiment, the external power supply PS may be a commercial power supply. In another embodiment, the external power supply PS may be a generator or other conventional AC power supply. In one embodiment, the filter module 11 may include a filter, an electromagnetic interference (EMI) circuit, or other necessary components. Since the circuit configuration of the filter module 11 is well known to those skilled in the art, it will not be described in detail here.

[0020] The rectification module 12 is connected to the filter module 11. In one embodiment, the rectification module 12 may be a full-wave rectifier. In another embodiment, the rectification module 12 may be a half-wave rectifier or other similar components. Since the circuit structure of the rectification module 12 is well known to those skilled in the art, it will not be described in detail here.

[0021] The power factor correction module 13 is connected to the rectification module 12. In one embodiment, the power factor correction module 13 may be an active (Active PFC) power factor correction circuit. In another embodiment, the power factor correction module 13 may be a passive (Passive PFC) power factor correction circuit, a dynamic (Dynamic PFC) power factor correction circuit, or other similar components. Since the circuit structure of the power factor correction module 13 is well known to those skilled in the art, it will not be described in detail here.

[0022] The isolated power module 14 is connected to the rectification module 12 and the power factor correction module 13. The isolated power module 14 may be various conventional isolated power supplies including a transformer and / or other necessary circuit components. Since the circuit structure of the isolated power module 14 is well known to those skilled in the art, it will not be described in detail here.

[0023] The voltage conversion module 15 is connected to the power factor correction module 13 and has a positive output terminal and a negative output terminal. The voltage conversion module 15 may be a DC / DC converter. 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. Since the circuit configuration of the voltage conversion module 15 is well known to those skilled in the art, it will not be described in detail here.

[0024] The load impedance matching detection module 16 and the load current detection module 17 are connected to the voltage conversion module 15. The control module 18 is connected to the insulation power module 14, the voltage conversion module 15, the load impedance matching detection module 16 and the load current detection module 17. In one embodiment, the control module 18 may be a microcontroller (MCU). In another embodiment, the control module 18 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other similar components.

[0025] The load impedance matching detection module 16 is connected to the positive output terminal of the voltage conversion module 15. The load impedance matching detection module 16 can perform a load impedance matching detection mechanism that can detect the input terminal of the lighting device and generate a detection voltage when the positive and negative output terminals are connected to the lighting device. Subsequently, the control module 18 controls the isolated power supply module 14 according to the detection voltage. When the detection voltage is within the preset voltage range, the control module 18 generates a start signal to start the isolated power supply module 14, and when the detection voltage is outside the preset voltage range, it generates an off signal to turn off the isolated power supply module 14. After the isolated power supply module 14 has started up, the control module 18 stops receiving the detection voltage. Subsequently, the load current detection module 17 detects the input terminal of the lighting device and generates a detection current after the isolated power supply module 14 has started up. The control module 18 controls the isolated power supply module 14 according to the detection current. When the detected current is not within the preset current range, the control module 18 generates an off signal, turns off the isolated power supply module 14, and restarts the load impedance matching detection mechanism by beginning to receive the detected voltage again. At this time, the load impedance matching detection module 16 detects the input terminals of the lighting device and generates a detected voltage, and the control module 18 determines whether the detected voltage is within the preset voltage range and starts or stops the isolated power supply module 14.

[0026] The load impedance matching detection module 16 has a special circuit design. After connecting the voltage conversion module 15 to the input terminal of the lighting device, the load impedance matching detection module 16 of the external power supply 1 and the input resistance of the lighting device automatically form a highly accurate voltage detection circuit. In this way, the load impedance matching detection module 16 can accurately generate the detection voltage, and the control module 18 can determine whether impedance matching has been achieved between the lighting device and the external power supply 1.

[0027] The load impedance matching detection mechanism described above ensures impedance matching between the lighting device and the external power supply unit 1, thereby achieving high performance for both the external power supply unit 1 and the lighting device. The aforementioned integrated switching mechanism for load current / load voltage detection effectively ensures that both the lighting device and the external power supply unit 1 operate normally, reducing the risk of electric shock to the user due to an open circuit in the lighting device. Therefore, the safety of the external power supply unit 1 can be effectively improved.

[0028] Naturally, this embodiment is for illustrative purposes only and does not limit the scope of the present invention, and any equivalent modifications or changes made based on the external power supply with load impedance matching detection function of this embodiment should still be within the scope of protection of the present invention.

[0029] Furthermore, since the manufacturer of the external power supply may differ from the manufacturer of the light-emitting diode (LED) lighting device, there is a possibility that the external power supply may not be compatible with the LED lighting device, potentially leading to many problems. In response to this, according to an embodiment of the present invention, an external power supply is provided that includes a load impedance matching detection function, comprising a rectifier module, a power factor correction module, an isolated power supply module, a voltage conversion module, a load impedance matching detection module, and a control module. The rectifier module is connected to an external power supply. The power factor correction module is connected to the rectifier module. The isolated power supply module is connected to the rectifier module and the power factor correction module. The voltage conversion module is connected to the power factor correction module and has a positive output terminal and a negative output terminal. The load impedance matching detection module is connected to the positive output terminal and, when the positive output terminal and the negative output terminal are connected to the lighting device, detects the input terminal of the lighting device and generates a detection voltage. The control module has a first detection pin and a control pin. The control pin is connected to the isolated power supply module. The first detection pin is connected to the load impedance matching detection module and receives the detection voltage. The control module controls the isolated power supply module via control pins based on the detected voltage. When the detected voltage is within the preset voltage range, the control module generates a start signal to activate the isolated power supply module, and when the detected voltage is outside the preset voltage range, it generates an off signal to turn off the isolated power supply module. The load impedance matching detection mechanism described above ensures impedance matching between the lighting device and the external power supply, enabling both the external power supply and the lighting device to achieve high performance.

[0030] Furthermore, according to embodiments of the present invention, the load impedance matching detection module has a special circuit design, and after connecting the voltage conversion module to the input terminal of the lighting device, the load impedance matching detection module of the external power supply and the input resistance of the lighting device automatically form a high-precision voltage detection loop. In this way, the load impedance matching detection module accurately generates a detection voltage, and the control module can determine whether the lighting device and the external power supply have achieved impedance matching. Therefore, the external power supply can achieve high detection accuracy and meet the needs of actual applications.

[0031] Furthermore, according to an embodiment of the present invention, the external power supply further includes a load current detection module. The control module has a second detection pin, the load current detection module is connected to a negative output terminal, and the negative output terminal is connected to the second detection pin. After the isolated power module is started up, the load current detection module detects the input terminal of the lighting device and generates a detection current, the second detection pin receives the detection current, and the control module controls the isolated power module via the control pin according to the detection current. When the detection current is not within the preset current range, the control module generates an off signal to turn off the isolated power module and receives the detection voltage again via the first detection pin. As can be seen from the above, after the isolated power module is started up, the load current detection module can continue to detect the input current of the load, allowing the control module to determine whether the lighting device (load) is abnormal based on the input current, and the load impedance matching detection mechanism is executed again when the lighting device is abnormal. The aforementioned load current / load voltage detection switching matching mechanism effectively ensures that both the lighting device and the external power supply operate normally, reducing the risk of electric shock to the user due to an open circuit in the lighting device. Therefore, it effectively improves the safety of the external power supply.

[0032] Furthermore, according to embodiments of the present invention, the circuit design of the external power supply can also be applied to light-emitting diode lighting devices, achieving high efficiency. Therefore, the external power supply can adapt to future development trends, further expand its applications, make its use more flexible, and meet environmental protection requirements.

[0033] Furthermore, according to the embodiments of the present invention, the circuit design of the external power supply is simple, so the desired effect can be obtained without significantly increasing the cost. Therefore, the external power supply can achieve very high practicality and meet the requirements of different responses. From the above, it can be seen that the external power supply equipped with a load impedance matching detection function according to the embodiments of the present invention can certainly achieve excellent technical results.

[0034] Figure 2 is a circuit diagram of an external power supply with load impedance matching detection function according to one embodiment of the present invention. As shown in the figure, the external power supply 1 includes a filter module 11, a rectifier module 12, a power factor correction module 13, an isolated power supply module 14, a voltage conversion module 15, a load impedance matching detection module 16, a load current detection module 17, and a control module 18.

[0035] The filter module 11 is connected to an external power supply PS. In one embodiment, the external power supply PS may be a commercial power supply. In another embodiment, the external power supply PS may be a generator or another conventional AC power supply. In one embodiment, the filter module 11 may include a filter, an electromagnetic interference (EMI) circuit, or other necessary components. The circuit configuration of the filter module 11 is well known to those skilled in the art and will not be described in detail here.

[0036] The rectifier module 12 is connected to the filter module 11. The power factor correction module 13 is connected to the rectifier module 12. The isolated power supply module 14 is connected to the rectifier module 12 and the power factor correction module 13. The isolated power supply module 14 has an operating voltage supply terminal Vcc and a ground terminal GND. The voltage conversion module 15 is connected to the power factor correction module 13 and has a positive output terminal P+ and a negative output terminal P-. The control module 18 is connected to the isolated power supply module 14, the voltage conversion module 15, the load impedance matching detection module 16 and the load current detection module 17. The control module 18 has a first detection pin Dp1, a second detection pin Dp2, a control pin Cp and a power pin Sp. The power pin Sp is connected to the operating voltage supply terminal Vcc, and the control pin Cp is connected to the isolated power supply module 14.

[0037] The load impedance matching detection module 16 is connected to the positive output terminal P+. The load impedance matching detection module 16 includes a second resistor R2, a diode D1, and a voltage detection point VP. One end of the second resistor R2 is connected to the operating voltage supply terminal Vcc, and the other end of the second resistor R2 is connected to the voltage detection point Vp. The voltage detection point Vp is connected to the first detection pin Dp1 and the positive terminal of diode D1, and the negative terminal of diode D1 is connected to the positive output terminal P+. The circuit configuration of the load impedance matching detection module 16 can be modified as needed.

[0038] The load current detection module 17 is connected to the negative output terminal P- and the ground terminal GND, and the negative output terminal P- is connected to the second detection pin Dp2. The load current detection module 17 includes a first resistor R1. The circuit configuration of the load current detection module 17 can be changed as needed.

[0039] Naturally, this embodiment is for illustrative purposes only and does not limit the scope of the present invention, and any equivalent modifications or changes made based on the external power supply with load impedance matching detection function of this embodiment should still be within the scope of protection of the present invention.

[0040] Figure 3 is an explanatory diagram illustrating the usage of an external power supply with load impedance matching detection function according to another embodiment of the present invention. As shown in the figure, the lighting device 2 includes a positive electrode L+, a negative electrode L-, an input resistor RD, and a light source LD (the light source LD may be one or more light-emitting diodes). These light-emitting diodes can be connected in series or in parallel with each other. The light source LD may include a hybrid circuit of a series circuit and a parallel circuit.

[0041] When the positive output terminal P+ and negative output terminal P- of the voltage conversion module 15 are connected to the positive terminal L+ and negative terminal L- of the lighting device 2, the load impedance matching detection module 16 can perform the load impedance matching detection mechanism. Of these, the second resistor R2, diode D1, positive output terminal P+, input resistor RD of the lighting device 2, and negative output terminal P- form a voltage detection loop (indicated by arrow AR in the figure), generating a detection voltage at the voltage detection point Vp. The control module 18 can receive the detection voltage via the first detection pin Dp1. When the detection voltage is within the preset voltage range, the control module 18 generates a start signal Cs1 and transmits it to the isolated power supply module 14 via the control pin Cp to start the isolated power supply module 14. Conversely, when the detection voltage is not within the preset voltage range, the control module 18 generates an off signal Cs2 and transmits it to the isolated power supply module 14 via the control pin Cp to turn off the isolated power supply module 14.

[0042] After the isolated power module 14 is started, the control module 18 stops receiving the detection voltage from the first detection pin Dp1. Next, after the isolated power module 14 is started, the load current detection module 17 detects the input terminal of the lighting device 2 and generates a detection current, which the control module 18 receives via the second detection pin Dp2. The control module 18 controls the isolated power module 14 via the control pin Cp according to the detection current. The control module 18 controls the isolated power module 14 according to the detection current. When the detection current is within the preset voltage range, both the external power supply 1 and the lighting device 2 operate normally. Therefore, the control module 18 still sends a start signal Cs1 to the isolated power module 14 to maintain the isolated power module 14 in the started state. When the lighting device is open-circuited or other abnormal conditions occur, the control module 18 can detect that the detection current is not within the preset voltage range. At this time, the control module 18 generates an off signal Cs2 to turn off the isolated power supply module 14, and restarts the load impedance matching detection mechanism by beginning to receive the detection voltage again. At this time, the load impedance matching detection module 16 detects the input terminal of the lighting device 2 and generates a detection voltage, and the control module 18 determines whether the detection voltage is within the preset voltage range and starts or stops the isolated power supply module 14. The above-mentioned preset voltage range and preset current range can be adjusted according to actual needs, enabling the external power supply 1 to achieve high performance.

[0043] As can be seen from the above, the load impedance matching detection module 16 has a special circuit design, and after connecting the voltage conversion module 15 to the input terminal of the lighting device, the load impedance matching detection module 16 of the external power supply 1 and the input resistance of the lighting device automatically form a high-precision voltage detection loop. In this way, the load impedance matching detection module 16 accurately generates a detection voltage, and the control module 18 can determine whether the lighting device and the external power supply have achieved impedance matching.

[0044] The load impedance matching detection mechanism described above ensures impedance matching between the lighting device and the external power supply unit 1, thereby achieving high performance for both the external power supply unit 1 and the lighting device. The aforementioned integrated switching mechanism for load current / load voltage detection effectively ensures the normal operation of both the lighting device and the external power supply unit 1, reducing the risk of electric shock to the user due to an open circuit in the lighting device. Therefore, the safety of the external power supply unit 1 can be effectively improved.

[0045] Naturally, this embodiment is for illustrative purposes only and does not limit the scope of the present invention, and any equivalent modifications or changes made based on the external power supply with load impedance matching detection function of this embodiment should still be within the scope of protection of the present invention.

[0046] In summary, according to embodiments of the present invention, an external power supply is provided that includes a load impedance matching detection function, comprising a rectifier module, a power factor correction module, an isolated power supply module, a voltage conversion module, a load impedance matching detection module, and a control module. The rectifier module is connected to an external power supply. The power factor correction module is connected to the rectifier module. The isolated power supply module is connected to the rectifier module and the power factor correction module. The voltage conversion module is connected to the power factor correction module and has a positive output terminal and a negative output terminal. The load impedance matching detection module is connected to the positive output terminal and detects the input terminal of a lighting device and generates a detection voltage when the positive output terminal and the negative output terminal are connected to a lighting device. The control module has a first detection pin and a control pin. The control pin is connected to the isolated power supply module. The first detection pin is connected to the load impedance matching detection module and receives the detection voltage. The control module controls the isolated power supply module via the control pin based on the detection voltage. The control module generates a start signal to activate the isolated power supply module when the detected voltage is within the preset voltage range, and generates an off signal to turn off the isolated power supply module when the detected voltage is outside the preset voltage range. The load impedance matching detection mechanism described above ensures impedance matching between the external power supply and the lighting device, enabling both the external power supply and the lighting device to achieve high performance.

[0047] Furthermore, according to embodiments of the present invention, the load impedance matching detection module has a special circuit design, and after connecting the voltage conversion module to the input terminal of the lighting device, the load impedance matching detection module of the external power supply and the input resistance of the lighting device automatically form a high-precision voltage detection loop. In this way, the load impedance matching detection module accurately generates a detection voltage, and the control module can determine whether the lighting device and the external power supply have achieved impedance matching. Therefore, the external power supply can achieve high detection accuracy and meet the needs of actual applications.

[0048] Furthermore, according to an embodiment of the present invention, the external power supply further includes a load current detection module. The control module has a second detection pin, the load current detection module is connected to a negative output terminal, and the negative output terminal is connected to the second detection pin. After the isolated power module is started up, the load current detection module detects the input terminal of the lighting device and generates a detection current, the second detection pin receives the detection current, and the control module controls the isolated power module via the control pin according to the detection current. When the detection current is not within the preset current range, the control module generates an off signal to turn off the isolated power module and receives the detection voltage again via the first detection pin. As can be seen from the above, after the isolated power module is started up, the load current detection module can continue to detect the input current of the load, allowing the control module to determine whether the lighting device (load) is abnormal based on the input current, and the load impedance matching detection mechanism is executed again when the lighting device is abnormal. The aforementioned load current / load voltage detection switching matching mechanism effectively ensures that both the lighting device and the external power supply operate normally, reducing the risk of electric shock to the user due to an open circuit in the lighting device. Therefore, it effectively improves the safety of the external power supply.

[0049] Furthermore, according to embodiments of the present invention, the circuit design of the external power supply can also be applied to light-emitting diode lighting devices, achieving high efficiency. Therefore, the external power supply can adapt to future development trends, further expand its applications, make its use more flexible, and meet environmental protection requirements.

[0050] Furthermore, according to embodiments of the present invention, the circuit design of the external power supply is simple, so the desired effect can be obtained without significantly increasing costs. Therefore, the external power supply can achieve very high practicality and meet the demands of different responses.

[0051] While the embodiments described herein are explained, it should be noted that this does not limit the scope of the claims of the present invention. Therefore, any changes and modifications to the embodiments described herein, or substitution of equivalent structures or processes using the contents of the specification and drawings of the present invention, or direct or indirect application of the above-described technology to other related technical fields, based on the innovative concept of the present invention, are all included within the scope of the claims of the present invention. [Explanation of Symbols]

[0052] 1. External power supply 11 Filter Modules 12 Rectifier Modules 13 Power Factor Correction Module 14. Isolated power supply module 15 Voltage conversion module 16. Load Impedance Matching Detection Module 17. Load current detection module 18 Control Module 2. Lighting device L+ Positive electrode of lighting device L- Lighting device negative electrode LD light source RD Input Resistance PS external power supply P+ Positive Output Terminal P- Negative output terminal Vcc operating voltage supply terminal GND Grounding terminal Dp1 First detection pin Dp2 Second detection pin Cp control pin SP Power Pin R1 is the first resistor. R2 2nd resistor D1 diode Vp voltage detection point Cs1 activation signal Cs2 Off Signal AR arrow

Claims

1. A rectifier module connected to an external power supply, A power factor correction module connected to the rectifier module, An isolated power supply module connected to the rectifier module and the power factor correction module, having an operating voltage supply terminal, A voltage conversion module connected to the power factor correction module, having a positive output terminal and a negative output terminal, A load impedance matching detection module is connected to the positive output terminal and includes a second resistor, a diode, and a voltage detection point. A control module having a first detection pin, a control pin and a power supply pin, Includes, One end of the second resistor is connected to the operating voltage supply terminal, and the other end of the second resistor is connected to the voltage detection point. The voltage detection point is connected to the first detection pin and the positive terminal of the diode, and the negative terminal of the diode is connected to the positive terminal output terminal. The power supply pin is connected to the operating voltage supply terminal, After the positive output terminal and the negative output terminal are connected to the lighting device, the second resistor, the diode, the positive output terminal, the input resistor of the lighting device, and the negative output terminal form a voltage detection loop. The load impedance matching detection module detects the voltage at the input terminal of the lighting device and generates a detection voltage, and the first detection pin receives the detection voltage. The control pin is connected to the isolated power supply module. The control module is an external power supply equipped with a load impedance matching detection function, characterized in that when the detected voltage is within a preset voltage range, it generates a start signal to start the isolated power supply module via the control pin, and when the detected voltage is outside the preset voltage range, it generates an off signal to turn off the isolated power supply module via the control pin.

2. An external power supply with a load impedance matching detection function according to claim 1, characterized in that, after the isolated power supply module is started up, the control module stops receiving the detection voltage from the first detection pin.

3. The control module further includes a load current detection module, the control module further has a second detection pin, the load current detection module is connected to the negative output terminal, the negative output terminal is connected to the second detection pin, the load current detection module detects the current flowing to the input terminal of the lighting device after the isolation power module is started and generates a detection current, the second detection pin receives the detection current, The external power supply with load impedance matching detection function according to claim 2, characterized in that the control module controls the isolated power supply module via the control pins based on the detected current.

4. The control module generates the off signal when the detected current is not within the preset current range, turns off the isolated power supply module, and receives the detected voltage again via the first detection pin, thus providing an external power supply with a load impedance matching detection function as described in claim 3.

5. The load current detection module is characterized by including a first resistor, making it an external power supply with a load impedance matching detection function according to claim 3.

6. The external power supply with load impedance matching detection function according to claim 3, characterized in that the isolated power supply module has a grounding terminal, and the load current detection module is connected to the grounding terminal.

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