External power supply feeder having 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 greatly 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] Based on an embodiment of the present invention, an external power supply with a load impedance matching detection function including a rectification module, a power factor correction module, an isolated power module, a voltage conversion module, a load impedance matching detection module, and a control module is provided. The rectification module is connected to an external power supply. The power factor correction module is connected to the rectification module. The isolated power module is connected to the rectification 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 generates a detection voltage by detecting the input terminal of the lighting device when the positive output terminal and the negative output terminal are connected to the lighting device. The control module has a first detection pin and a control pin. The control pin is connected to the isolated power 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 module via the control pin based on the detection voltage.

[0005] In one embodiment, when the detection voltage is within a preset voltage range, the control module generates a start signal to start the isolated power module, and when the detection voltage is not within the preset voltage range, the control module generates an off signal to turn off the isolated power module.

[0006] In one embodiment, after the isolated power module is started, 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 the negative output terminal, and the negative output terminal 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, when the detected current is not within the preset current range, the control module generates an off signal, turns off the isolated power supply module, and receives a 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 ground terminal. The load current detection module is connected to the ground 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 anode of the diode. The cathode 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 a power pin. The power pin is connected to the operating voltage supply terminal.

Advantages of the Invention

[0014] Based on the above, the external power supply with a load impedance matching detection function disclosed in the present invention can have one or more of the following advantages. (1) In one embodiment of the present invention, an external power supply is provided with a load impedance matching detection function including a rectification module, a power factor correction module, an isolated power module, a voltage conversion module, a load impedance matching detection module, and a control module. The rectification module is connected to an external power supply. The power factor correction module is connected to the rectification module. The isolated power module is connected to the rectification 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 generates a detection voltage by detecting the input terminal of the lighting device when the positive output terminal and the negative output terminal are connected to the lighting device. The control module has a first detection pin and a control pin. The control pin is connected to the isolated power 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 module via the control pin based on the detection voltage. When the detection voltage is within a preset voltage range, the control module generates a startup signal to start the isolated power module, and when the detection voltage is not within the preset voltage range, the control module generates an off signal to turn off the isolated power module. With the above load impedance matching detection mechanism, the external power supply can ensure the impedance matching between the lighting device and the external power supply, and both the external power supply and the lighting device can achieve high performance. (2) In one embodiment of the present invention, the load impedance matching detection module has a special circuit design. 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 can accurately generate the detection voltage, and the control module can determine whether the lighting device and the external power supply achieve impedance matching. Therefore, the external power supply can achieve high detection accuracy and meet the requirements 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, and the load current detection module is connected to the negative output terminal, and the negative output terminal is connected to the second detection pin. After the isolation power module is activated, the load current detection module detects the input terminal of the lighting device to generate a detection current, the second detection pin receives the detection current, and the control module controls the isolation 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 isolation power module and receives the detection voltage again through the first detection pin. As can be seen from the above, after the isolation power module is activated, the load current detection module can continuously detect the input current of the load, enabling the control module to determine whether the lighting device (load) is abnormal based on the input current, and executing the load impedance matching detection mechanism again when the lighting device is abnormal. The above-mentioned load current / load voltage detection switching and matching mechanism effectively guarantees that the operation processes of both the lighting device and the external power supply are normal, and can reduce the risk of electric shock to the user caused by an open circuit of the lighting device. Therefore, the safety of the external power supply can be effectively improved. (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 can achieve high efficiency. Therefore, the external power supply conforms to the future development trend, can further expand the application of the external power supply, make its use more flexible, and meet the requirements of environmental protection. (5) In one embodiment of the present invention, since the circuit design of the external power supply is simple, the desired effect can be obtained without significantly increasing the cost. Therefore, the external power supply achieves very high practicality and can meet different response requirements.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

[0016] In the following embodiments, the detailed features and advantages of the present invention will be described. The content is sufficient for those skilled in the art to understand the technical content of the present invention and to enable its implementation accordingly. Further, from the disclosure content, claims, and drawings of this specification, those skilled in the art can easily understand the objectives and advantages of the present invention.

[0017] Hereinafter, with reference to the related drawings, embodiments of an external power supply having a load impedance matching detection function of the present invention will be described. For easier understanding and easier illustration in the drawings, the dimensions and ratios of each member in the drawings may be exaggerated or reduced. In the following description and / or claims, when a member is described as being "connected" or "coupled" to another member, it may be directly connected or coupled to the other member, or an intermediate member may be present. When a member is described as being "directly connected" or "directly coupled" to another member, no intermediate member is present, and the same should be interpreted similarly for other terms used to describe the relationship between members or layers. For easier understanding, the same members in the following embodiments will be described with the same reference numerals.

[0018] FIG. 1 is a block diagram of the circuit configuration of an external power supply having a load impedance matching detection function according to an 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 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 rectifier module 12 is connected to the filter module 11. In one embodiment, the rectifier module 12 may be a full-wave rectifier. In another embodiment, the rectifier module 12 may be a half-wave rectifier or other similar components. Since the circuit structure of the rectifier 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 rectifier module 12. In one embodiment, the power factor correction module 13 may be an active power factor correction (PFC) circuit. In another embodiment, the power factor correction module 13 may be a passive PFC circuit, a dynamic PFC 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 supply module 14 is connected to the rectifier module 12 and the power factor correction module 13. The isolated power supply 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 supply 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 isolated power supply 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 execute a load impedance matching detection mechanism that can detect the input terminal of the lighting device and generate a detection voltage when the positive output terminal and the negative output terminal are connected to the lighting device. Then, the control module 18 controls the insulation 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 insulation power supply module 14, and when the detection voltage is not within the preset voltage range, the control module 18 generates an off signal to turn off the insulation power supply module 14. After the insulation power supply module 14 is started, the control module 18 stops receiving the detection voltage. Then, the load current detection module 17 detects the input terminal of the lighting device after the insulation power supply module 14 is started and generates a detection current. The control module 18 controls the insulation power supply module 14 according to the detection current. When the detection current is not within the preset current range, the control module 18 generates an off signal to turn off the insulation power supply module 14, starts receiving the detection voltage again, and restarts the aforementioned load impedance matching detection mechanism. At this time, the load impedance matching detection module 16 detects the input terminal of the lighting device 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 insulation 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 high-precision voltage detection circuit. In this way, the load impedance matching detection module 16 can accurately generate a detection voltage, and the control module 18 can determine whether the lighting device and the external power supply 1 achieve impedance matching.

[0027] With the above load impedance matching detection mechanism, the external power supply 1 can ensure the impedance matching between the lighting device and the external power supply 1, and achieve the high performance of both the external power supply 1 and the lighting device. The above load current / load voltage detection switching and integration mechanism can effectively ensure that the operation processes of both the lighting device and the external power supply 1 are normal, and can reduce the risk of electric shock to users caused by the open circuit of the lighting device. Therefore, the safety of the external power supply 1 can be effectively improved.

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

[0029] Note that since the manufacturer of the external power supply may be different from the manufacturer of the light-emitting diode lighting device, the external power supply may not be compatible with the light-emitting diode lighting device, and many problems may occur. In contrast, according to an embodiment of the present invention, the external power supply is provided with an external power supply having a load impedance matching detection function including a rectification module, a power factor correction module, an isolation power module, a voltage conversion module, a load impedance matching detection module, and a control module. The rectification module is connected to an external power supply. The power factor correction module is connected to the rectification module. The isolation power module is connected to the rectification 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 generates a detection voltage by detecting the input terminal of the lighting device when the positive output terminal and the negative output terminal are connected to the lighting device. The control module has a first detection pin and a control pin. The control pin is connected to the isolation power module. The first detection pin is connected to the load impedance matching detection module and receives the detection voltage. The control module controls the isolation power module via the control pin based on the detection voltage. The control module generates a start signal for starting the isolation power module when the detection voltage is within a preset voltage range, and generates an off signal for turning off the isolation power module when the detection voltage is not within the preset voltage range. With the above load impedance matching detection mechanism, the external power supply can ensure the impedance matching between the lighting device and the external power supply, and both the external power supply and the lighting device can achieve high performance.

[0030] Also, according to the embodiments of the present invention, the load impedance matching detection module has a special circuit design. 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 can accurately generate the detection voltage, and the control module can determine whether the lighting device and the external power supply achieve impedance matching. Therefore, the external power supply can achieve high detection accuracy and meet the requirements of actual applications.

[0031] Also, according to the embodiments 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 the negative output terminal, and the negative output terminal is connected to the second detection pin. After the isolation power module is activated, the load current detection module detects the input terminal of the lighting device to generate a detection current. The second detection pin receives the detection current, and the control module controls the isolation 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 isolation power module and receives the detection voltage again through the first detection pin. As can be seen from the above, after the isolation power module is activated, the load current detection module can continuously detect the input current of the load, enabling the control module to determine whether the lighting device (load) is abnormal based on the input current, and execute the load impedance matching detection mechanism again when the lighting device is abnormal. The above load current / load voltage detection switching and matching mechanism effectively guarantees that the operation processes of both the lighting device and the external power supply are normal, and can reduce the risk of electric shock to users caused by an open circuit of the lighting device. Therefore, the safety of the external power supply can be effectively improved.

[0032] Moreover, according to the embodiments of the present invention, the circuit design of the external power supply can also be applied to the light-emitting diode lighting device, and high efficiency can be achieved. Therefore, the external power supply conforms to the trend of future development, can further expand the application of the external power supply, make its use more flexible, and can meet the requirements of environmental protection.

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

[0034] FIG. 2 is a circuit diagram of an external power supply with a load impedance matching detection function according to an 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 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 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.

[0036] The rectification module 12 is connected to the filter module 11. The power factor correction module 13 is connected to the rectification module 12. The isolated power supply module 14 is connected to the rectification 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 supply pin Sp. The power supply 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 one 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 anode of the diode D1, and the cathode of the diode D1 is connected to the positive output terminal P+. The circuit configuration of the load impedance matching detection module 16 can be changed according to actual needs.

[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 according to actual needs.

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

[0040] Figure 3 is an explanatory diagram of the usage state of an external power supply equipped with a 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 can 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 the negative output terminal P- of the voltage conversion module 15 are connected to the positive electrode L+ and the negative electrode L- of the lighting device 2, the load impedance matching detection module 16 can execute a load impedance matching detection mechanism. Among them, the second resistor R2, the diode D1, the positive output terminal P+, the input resistor RD of the lighting device 2, and the negative output terminal P- form a voltage detection loop (indicated by the arrow AR in the figure) and generate 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 isolation power supply module 14 via the control pin Cp to start the isolation 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 isolation power supply module 14 via the control pin Cp to turn off the isolation power supply module 14.

[0042] After the isolation power module 14 is activated, the control module 18 stops receiving the detection voltage from the first detection pin Dp1. Next, after the isolation power module 14 is activated, the load current detection module 17 detects the input terminals of the lighting device 2 to generate a detection current, and the control module 18 receives the detection current via the second detection pin Dp2. The control module 18 controls the isolation power module 14 via the control pin Cp according to the detection current. The control module 18 controls the isolation 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 transmits the activation signal Cs1 to the isolation power module 14 to maintain the isolation power module 14 in the activated 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 isolation power module 14, starts receiving the detection voltage again, and restarts the aforementioned load impedance matching detection mechanism. At this time, the load impedance matching detection module 16 detects the input terminals of the lighting device 2 to generate a detection voltage, and the control module 18 determines whether the detection voltage is within the preset voltage range to start or stop the isolation power 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. After connecting the voltage conversion module 15 to the input terminals 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 the detection voltage, enabling the control module 18 to determine whether the lighting device and the external power supply achieve impedance matching.

[0044] With the above load impedance matching detection mechanism, the external power supply 1 can guarantee the impedance matching between the lighting device and the external power supply 1, and achieve the high performance of both the external power supply 1 and the lighting device. The above switching and integration mechanism for detecting load current / load voltage can effectively guarantee the normal operation process of the lighting device and the external power supply 1, and reduce the risk of electric shock to users caused by the open circuit of the lighting device. Therefore, the safety of the external power supply 1 can be effectively improved.

[0045] Of course, this embodiment is only used for illustrative explanation and does not limit the scope of the present invention. Equivalent modifications or changes made based on the external power supply with the load impedance matching detection function of this embodiment should still be included in the protection scope of the present invention.

[0046] In summary, according to the embodiments of the present invention, an external power supply is provided with a load impedance matching detection function including a rectification module, a power factor correction module, an isolated power module, a voltage conversion module, a load impedance matching detection module, and a control module. The rectification module is connected to an external power supply. The power factor correction module is connected to the rectification module. The isolated power module is connected to the rectification 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 generates a detection voltage by detecting the input terminal of the lighting device when the positive output terminal and the negative output terminal are connected to the lighting device. The control module has a first detection pin and a control pin. The control pin is connected to the isolated power 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 module via the control pin based on the detection voltage. When the detection voltage is within a preset voltage range, the control module generates a start signal to start the isolated power module, and when the detection voltage is not within the preset voltage range, the control module generates an off signal to turn off the isolated power module. With the above load impedance matching detection mechanism, the external power supply can ensure the impedance matching between the lighting device and the external power supply, and both the external power supply and the lighting device can achieve high performance.

[0047] Also, according to the embodiments of the present invention, the load impedance matching detection module has a special circuit design. After the voltage conversion module is connected 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 can accurately generate the detection voltage, and the control module can determine whether the lighting device and the external power supply achieve impedance matching. Therefore, the external power supply can achieve high detection accuracy and meet the requirements of actual applications.

[0048] Also, 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, and the load current detection module is connected to the negative output terminal, and the negative output terminal is connected to the second detection pin. After the isolated power module is activated, the load current detection module detects the input terminal of the lighting device to generate 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 through the first detection pin. As can be seen from the above, after the isolated power module is activated, the load current detection module can continuously detect the input current of the load, enabling the control module to determine whether the lighting device (load) is abnormal based on the input current, and executing the load impedance matching detection mechanism again when the lighting device is abnormal. The above-mentioned load current / load voltage detection switching and matching mechanism effectively guarantees that the operation processes of both the lighting device and the external power supply are normal, and can reduce the risk of electric shock to the user caused by an open circuit of the lighting device. Therefore, the safety of the external power supply can be effectively improved.

[0049] Also, according to an embodiment of the present invention, the circuit design of the external power supply can also be applied to the light-emitting diode lighting device, achieving high efficiency. Therefore, the external power supply conforms to the future development trend, can further expand the application of the external power supply, make its use more flexible, and meet the requirements of environmental protection.

[0050] Furthermore, according to an embodiment of the present invention, since the circuit design of the external power supply is simple, the desired effect can be obtained without significantly increasing the cost. Therefore, the external power supply achieves very high practicality and can meet different response requirements.

[0051] Although the above-described embodiments are explained in this specification, it should be noted that they do not limit the scope of the claims of the present invention. Therefore, changes and modifications to the embodiments described in this specification based on the innovative concept of the present invention, or substitutions of equivalent structures or equivalent processes performed using the content of the specification and drawings of the present invention, and direct or indirect application of the above technical solutions to other related technical fields are all included in the scope of the claims of the present invention.

Description of Reference Numerals

[0052] 1 External power supply 11 Filter module 12 Rectifier module 13 Power factor correction module 14 Isolated power 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- Negative electrode of lighting device LD Light source RD Input resistance PS External power supply P+ Positive electrode output terminal P- Negative electrode output terminal Vcc Operating voltage supply terminal GND Ground terminal Dp1 First detection pin Dp2 Second detection pin Cp Control pin Sp Power pin R1 First resistor R2 Second resistor D1 Diode Vp Voltage detection point Cs1 Start signal Cs2 Off signal AR Arrow

Claims

1. A rectification module connected to an external power supply, A power factor correction module connected to the rectification module, An isolation power supply module connected to the rectification module and the power factor correction module, A voltage conversion module connected to the power factor correction module and having a positive output terminal and a negative output terminal, A load impedance matching detection module connected to the positive output terminal and detecting an input terminal of the lighting device to generate a detection voltage when the positive output terminal and the negative output terminal are connected to the lighting device, A control module having a first detection pin and a control pin, the control pin being connected to the isolation power supply module, the first detection pin being connected to the load impedance matching detection module, and receiving the detection voltage, comprising, The control module controls the isolation power supply module via the control pin based on the detection voltage, and an external power supply having a load impedance matching detection function.

2. When the detection voltage is within a preset voltage range, the control module generates a start signal to start the isolation power supply module, and when the detection voltage is not within the preset voltage range, the control module generates an off signal to turn off the isolation power supply module. The external power supply with a load impedance matching detection function according to claim 1.

3. After the isolation power supply module is started, the control module stops receiving the detection voltage from the first detection pin. The external power supply with a load impedance matching detection function according to claim 2.

4. Further comprising a load current detection module, the control module further having a second detection pin, the load current detection module being connected to the negative output terminal, the negative output terminal being connected to the second detection pin, the load current detection module detecting an input terminal of the lighting device after the isolation power supply module is started and generating a detection current, the second detection pin being used to receive the detection current, and the control module being used to control the isolation power supply module via the control pin based on the detection current. The external power supply with a load impedance matching detection function according to claim 2.

5. The control module generates the 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. The external power supply with a load impedance matching detection function according to claim 4, characterized in that.

6. The load current detection module includes a first resistor. The external power supply with a load impedance matching detection function according to claim 4, characterized in that.

7. The isolated power supply module has a ground terminal, and the load current detection module is connected to the ground terminal. The external power supply with a load impedance matching detection function according to claim 4, characterized in that.

8. 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, 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 electrode of the diode, and the negative electrode of the diode is connected to the positive output terminal. The external power supply with a load impedance matching detection function according to claim 1, characterized in that.

9. 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 resistance of the lighting device, and the negative output terminal form a voltage detection loop. The external power supply with a load impedance matching detection function according to claim 8, characterized in that.

10. The control module further has a power pin, and the power pin is connected to the operating voltage supply terminal. The external power supply with a load impedance matching detection function according to claim 9, characterized in that.

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