Power supply with multi-function protection circuit

Abstract

We provide a power supply equipped with a multi-function protection circuit. [Solution] The drive power supply equipped with a multi-function protection circuit includes a rectifier module, a conversion module, and an output filter module. The rectifier module is connected to an external power supply. The conversion module is connected to the rectifier module. The output filter module is connected to the load and includes a filter unit and a protection unit. The filter unit is connected to the conversion module. The protection unit is connected to the filter unit and the conversion module. The protection unit includes current limiting members and switching members connected in parallel to each other.

Description

Technical Field

[0001] The present invention relates to a driving power supply, and particularly to a driving power supply equipped with a multifunctional protection circuit.

Background Art

[0002] With the improvement of environmental protection awareness, more energy-saving light-emitting diode (LED) lighting devices have become the mainstream, and significant improvements have been continuously made. In this process, the improvement of the driving power supply of LED lighting devices has also become the current development trend. Among them, how to ensure the quality of the driving power supply and reduce the impact of the input inrush current on the driving power supply has become an important issue.

[0003] Currently, many driving power supplies of light-emitting diodes do not fully consider the control of inrush current during design. Excessively high inrush current is likely to cause an overload situation, significantly increasing the possibility of fire.

[0004] Furthermore, the circuit design of most driving power supplies of light-emitting diodes usually includes an open-circuit protection mechanism. The open-circuit protection voltage is usually 30% higher than the normal operating voltage, which poses a higher withstand voltage requirement for the selection of filter capacitors. Electrolytic capacitors with a higher withstand voltage increase the cost, and these electrolytic capacitors are disadvantageous for circuit design due to their large size.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The objective of the present invention is to provide a driving power supply equipped with a multifunctional protection circuit.

Means for Solving the Problems

[0006] A drive power supply equipped with a multi-function protection circuit according to one embodiment of the present invention includes a rectifier module, a conversion module, and an output filter module. The rectifier module is connected to an external power supply. The conversion module is connected to the rectifier module. The output filter module is connected to the load and includes a filter unit and a protection unit. The filter unit is connected to the conversion module. The protection unit is connected to the filter unit and the conversion module. The protection unit includes current limiting members and switching members connected in parallel to each other.

[0007] In one embodiment, the load includes a plurality of light sources connected in series with each other. A switching member is connected to a power supply node, which is installed between the plurality of light sources.

[0008] In one embodiment, one end of the current limiting member and the first end of the switching member are connected to a first node, the other end of the current limiting member and the second end of the switching member are connected to a second node, and the third end of the switching member is connected to a third node. The first node is connected to a filter unit, the second node is connected to a conversion module, and the third node is connected to a power supply node.

[0009] In one embodiment, the protection unit further includes a control resistor. The third node is connected to the power supply node via the control resistor.

[0010] In one embodiment, the protective unit further includes a discharge resistor. One end of the discharge resistor is connected to a third node, and the other end of the discharge resistor is connected to a second node.

[0011] In one embodiment, the rectifier module receives the input voltage of an external power supply and generates a rectified voltage, and the conversion module converts the rectified voltage to generate a drive voltage, thereby charging the filter unit. The switching member is off when the filter unit is being charged.

[0012] In one embodiment, the switching member turns on when the load enters an operating state, causing the current limiting member to enter a short-circuit state.

[0013] In one embodiment, the switching member turns off when the load enters an open circuit state.

[0014] In one embodiment, the current limiting member is a thermistor.

[0015] In one embodiment, the filter unit is an electrolytic capacitor. [Effects of the Invention]

[0016] As described above, the drive power supply equipped with the multi-functional protection circuit of the embodiment of the present invention may have one or more of the following advantages. (1) In one embodiment of the present invention, the drive power supply includes a rectifier module, a conversion module, and an output filter module. The rectifier module is connected to an external power supply. The conversion module is connected to the rectifier module. The output filter module is connected to the load and includes a filter unit and a protection unit. The filter unit is connected to the conversion module. The protection unit is connected to the filter unit and the conversion module. The protection unit includes a current limiting member and a switching member connected in parallel to each other. The rectifier module receives the input voltage of the external power supply and generates a rectified voltage, and the conversion module converts the rectified voltage to generate a drive voltage, thereby charging the filter unit. The switching member is off when the filter unit is being charged. The protection unit, as one effective protection circuit, can provide a current limiting effect by connecting the current limiting member in series with the filter unit when the filter unit is being charged, thereby effectively reducing inrush current and preventing the occurrence of overload conditions. Therefore, the safety of the drive power supply can be greatly improved. (2) In one embodiment of the present invention, the output filter module of the drive power supply includes a protection unit, the protection unit includes a current limiting member and a switching member connected in parallel to each other. The switching member turns on when the load enters an operating state and causes the current limiting member to enter a short-circuit state. With the above mechanism, the protection unit can prevent energy loss by having the switching member temporarily short-circuit the current limiting member when the load enters an operating state. Therefore, the operating efficiency of the drive power supply can be greatly improved without affecting its safety. (3) In one embodiment of the present invention, the output filter module of the drive power supply includes a protection unit, the protection unit includes a current limiting member and a switching member connected in parallel with each other. The switching member turns off when the load enters an open circuit state, and simultaneously applies the open circuit voltage to the filter unit and the current limiting member. At this time, the current limiting member provides a voltage division effect, which can reduce the voltage received by the filter unit. The above mechanism can effectively prevent the filter unit from being damaged by high voltage, and can improve the reliability and service life of the drive power supply. In addition, the filter unit does not need to use high-voltage capacitors, which further reduces the cost of the drive power supply. (4) In one embodiment of the present invention, the output filter module of the drive power supply includes a protection unit, the protection unit includes a current limiting member and a switching member connected in parallel with each other. The current limiting member may be a thermistor. Therefore, when the temperature rises, the resistance value of the current limiting member also rises accordingly, improving the voltage division effect of the current limiting member and further reducing the voltage received by the filter unit. Therefore, the reliability and service life of the drive power supply can be further improved, and the cost of the drive power supply can be further reduced. (5) In one embodiment of the present invention, the output filter module of the drive power supply includes a protection unit, the protection unit includes a current limiting member and a switching member connected in parallel with each other. One end of the current limiting member and the first end of the switching member are connected to a first node, the other end of the current limiting member and the second end of the switching member are connected to a second node, the third end of the switching member is connected to a third node. The first node is connected to the filter unit, the second node is connected to the conversion module, and the third node is connected to the power supply node. The protection unit may further include a control resistor. The third node is connected to the power supply node via the control resistor. The circuit design can reduce the effect of the switching member on the brightness of the load. Thus, the load can still achieve high efficiency and meet the requirements of practical applications. (6) In one embodiment of the present invention, the protection unit of the output filter module of the drive power supply may further include a discharge resistor. One end of the discharge resistor is connected to a third node, and the other end of the discharge resistor is connected to a second node. The discharge resistor discharges when the load enters an open circuit state to turn off the switching member, and ensures that the switching member is turned off in a timely manner when the load enters an open circuit state. Thus, the discharge resistor ensures that the current limiting member provides a voltage division effect, reduces the voltage received by the filter unit, and effectively prevents the filter unit from being damaged by high voltage. [Brief explanation of the drawing]

[0017] [Figure 1] This is a block diagram of the circuit structure of a drive power supply equipped with a multi-functional protection circuit according to the first embodiment of the present invention. [Figure 2] This is a circuit diagram of a drive power supply equipped with a multi-functional protection circuit according to a second embodiment of the present invention. [Figure 3] This is a circuit diagram of a drive power supply equipped with a multi-functional protection circuit according to a third embodiment of the present invention. [Modes for carrying out the invention]

[0018] 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 enable its implementation accordingly. Moreover, based on the disclosure content, claims, and drawings in this specification, those skilled in the art can easily understand the objectives and advantages of the present invention.

[0019] Hereinafter, referring to the related drawings, embodiments of a drive power supply with a multifunctional protection circuit of the present invention will be described. For the sake of easy understanding and easy illustration in the drawings, the components in the drawings may be shown with exaggerated or reduced dimensions and ratios. In the following description and / or claims, when a member is described as "connected" or "coupled" to another member, it may be directly connected or coupled to the other member, or there may be an intervening member. When a member is described as "directly connected" or "directly coupled" to another member, there is no intervening member, and the same interpretation should apply to other terms used to explain the relationship between members or layers. For ease of understanding, the same members in the following embodiments will be described with the same reference numerals.

[0020] FIG. 1 is a block diagram of the circuit structure of a drive power supply with a multifunctional protection circuit according to the first embodiment of the present invention. As shown in the figure, the drive power supply 1 includes an input module 10, a rectification module 11, a conversion module 12, and an output filter module 13.

[0021] The rectification module 11 is connected to an external power supply PS through the input module 10. In one embodiment, the external power supply PS may be a commercial power supply, a generator, or other similar power sources. In one embodiment, the rectification module 11 includes one or more of a rectifier and a filter circuit.

[0022] The conversion module 12 is connected to the rectification module 11. In one embodiment, the conversion module 12 may be a DC / DC converter, for example, a boost converter, a buck converter, a buck-boost converter, or other similar components.

[0023] The output filter module 13 is connected to the load LD and includes a filter unit 131 and a protection unit 132. The filter unit 131 is connected to the conversion module 12. The protection unit 132 is connected to the filter unit 131 and the conversion module 12. The protection unit 132 includes a current limiting member 1321 and a switching member 1322 connected in parallel with each other. In one embodiment, the load LD includes a plurality of light sources connected to each other. The above-mentioned light sources may be connected in series or in parallel. In another embodiment, some of the light sources are connected in series and some of the other light sources are connected in parallel. In one embodiment, the above-mentioned plurality of light sources may be light emitting diodes Ls. The switching member 1322 is connected to the power supply node Np, and the power supply node Np is installed between the above-mentioned plurality of light sources. In one embodiment, the current limiting member 1321 is a resistor, a thermistor Rt or other similar members. In one embodiment, the switching member 1322 is a metal oxide semiconductor field effect transistor (MOSFET), a bipolar transistor (BJT) or other similar members. In one embodiment, the filter unit 131 is an electrolytic capacitor EC1 or other members having an energy storage function.

[0024] The rectification module 11 receives the input voltage of the external power supply PS through the input module 10 and generates a rectified voltage. The conversion module 12 converts the rectified voltage to generate a driving voltage and charges the filter unit 131. When the filter unit 131 is charged, the switching member 1322 is off. At this time, the protection unit 132 can operate as an effective protection circuit, and connect the current limiting member 1321 in series with the filter unit 131 when the filter unit 131 is charged to provide a current limiting effect. Therefore, the protection unit 132 can effectively reduce the inrush current.

[0025] When the load LD enters the operating state, the switching member 1322 turns on and puts the current limiting member 1321 into a short-circuit state. At this time, the protection unit 132 can temporarily short-circuit the current limiting member 1321 when the switching member 1322 enters the operating state of the load LD, preventing energy loss.

[0026] When the load LD enters an open-circuit state, the switching member 1322 turns off again. At this time, the open-circuit voltage is simultaneously applied to the filter unit 131 and the current limiting member 1321. At this time, the current limiting member 1321 can provide a voltage division effect, reducing the voltage received by the filter unit 131.

[0027] As described above, the protection unit 132 can operate as a single effective protection circuit, and by connecting the current limiting member 1321 in series with the filter unit 131 when the filter unit 131 is charging, it provides a current limiting effect, effectively reducing the inrush current and preventing the occurrence of overload conditions. Therefore, the safety of the drive power supply 1 can be greatly improved.

[0028] Furthermore, in this embodiment, the protection unit 132 can temporarily short-circuit the current limiting member 1321 when the switching member 1322 enters the operating state of the load LD, thereby preventing energy loss. Therefore, the operating efficiency of the drive power supply 1 can be significantly improved without affecting its safety.

[0029] Furthermore, in this embodiment, the switching member 1322 turns off when the load LD enters an open-circuit state, simultaneously applying the open-circuit voltage to the filter unit 131 and the current limiting member 1321. At this time, the current limiting member 1321 can provide a voltage division effect, reducing the voltage received by the filter unit 131. The above mechanism effectively prevents the filter unit 131 from being damaged by high voltage, improving the reliability and service life of the drive power supply 1. In addition, the filter unit 131 does not require the use of high-voltage capacitors, further reducing the cost of the drive power supply 1.

[0030] As can be seen from the above, the protection unit 132 is indeed a multi-functional protection circuit with a multi-functional protection mechanism.

[0031] Naturally, this embodiment is for illustrative purposes only and does not limit the scope of the present invention, and equivalent modifications or changes made based on the drive power supply with the multi-function protection circuit of this embodiment should still be included within the scope of protection of the present invention.

[0032] Figure 2 is a circuit diagram of a drive power supply equipped with a multi-function protection circuit according to a second embodiment of the present invention. As shown in the figure, the drive power supply 1 includes an input module 10, a rectifier module 11, a conversion module 12, and an output filter module 13.

[0033] The rectifier module 11 is connected to an external power supply PS by an input module 10. In this embodiment, the input module 10 includes a live line input terminal Lt and a neutral line input terminal Nt. A fuse (not shown) may be further provided between the rectifier module 11 and the input module 10. In this embodiment, the external power supply PS is a commercial power supply. In this embodiment, the rectifier module 11 includes a rectifier bridge BD1 and a filter circuit including a first capacitor C1, a first resistor R1, a first inductor L1, and a second capacitor C2. The circuit structure and operating mechanism of the rectifier module 11 described above are well known to the art and will not be described in detail here.

[0034] The conversion module 12 is connected to the rectifier module 11. In this embodiment, the conversion module 12 is a DC / DC converter including a second resistor R2, a third resistor R3, a third capacitor C3, a controller U1, a fourth resistor R4, a fifth resistor R5, a second inductor L2, a first diode D1, a second diode D2, and a first switch Q1 (metal oxide semiconductor field-effect transistor) (GND represents ground). In one embodiment, the controller U1 may be a microcontroller (MCU), a central processing unit (CPU), an application-specific integrated circuit chip (ASIC), a field-programmable gate array (FPGA), or other similar component. The circuit structure and operating mechanism of the above-described conversion module 12 are well known to the art and will not be described in detail here.

[0035] The output filter module 13 is connected to the positive terminal V+ and negative terminal V- of the load LD and includes a filter unit 131 and a protection unit 132. The filter unit 131 is connected to the conversion module 12. The protection unit 132 is connected to both the filter unit 131 and the conversion module 12. The protection unit 132 includes a current limiting member 1321 and a switching member 1322 connected in parallel with each other. In this embodiment, the load LD includes a plurality of light-emitting diodes LS connected in series with each other.

[0036] One end of the current limiting member 1321 and the first end of the switching member 1322 are connected to the first node N1, the other end of the current limiting member 1321 and the second end of the switching member 1322 are connected to the second node N2, and the third end of the switching member 1322 is connected to the third node N3. The first node N1 is connected to the filter unit 131, the second node N2 is connected to the conversion module 12, and the third node N3 is connected to the power supply node Np.

[0037] Similarly, the rectifier module 11 receives the input voltage of the external power supply PS via the input module 10 and generates a rectified voltage. The conversion module 12 converts the rectified voltage to generate a drive voltage and charges the filter unit 131. When the filter unit 131 is charging, the switching member 1322 is off. At this time, the protection unit 132 can operate as an effective protection circuit, and the current limiting member 1321 is connected in series with the filter unit 131 when it is charging to provide a current limiting effect. Therefore, the protection unit 132 can effectively reduce the inrush current.

[0038] When the load LD enters an operating state, the switching member 1322 turns on, causing the current limiting member 1321 to enter a short-circuit state. At this time, the protection unit 132 can temporarily short-circuit the current limiting member 1321 when the switching member 1322 enters an operating state, thereby preventing energy loss.

[0039] When the load LD enters an open-circuit state, the switching member 1322 turns off again. At this time, the open-circuit voltage is applied simultaneously to the filter unit 131 and the current limiting member 1321. At this time, the current limiting member 1321 can provide a voltage division effect, reducing the voltage received by the filter unit 131.

[0040] Naturally, this embodiment is for illustrative purposes only and does not limit the scope of the present invention, and equivalent modifications or changes made based on the drive power supply with the multi-function protection circuit of this embodiment should still be included within the scope of protection of the present invention.

[0041] Figure 3 is a circuit diagram of a drive power supply equipped with a multi-function protection circuit according to a third embodiment of the present invention. As shown in the figure, the drive power supply 1 includes an input module 10, a rectifier module 11, a conversion module 12, and an output filter module 13.

[0042] The rectifier module 11 is connected to an external power supply PS via an input module 10. In this embodiment, the input module 10 includes a live line input terminal Lt and a neutral line input terminal Nt. A fuse (not shown) may be further provided between the rectifier module 11 and the input module 10. In this embodiment, the external power supply PS is a commercial power supply. In this embodiment, the rectifier module 11 includes a rectifier bridge BD1 and a filter circuit including a first capacitor C1, a first resistor R1, a first inductor L1, and a second capacitor C2. The circuit structure and operating mechanism of the rectifier module 11 described above are well known to the art and are therefore omitted in detail here.

[0043] The conversion module 12 is connected to the rectifier module 11. In this embodiment, the conversion module 12 may be a DC / DC converter including a second resistor R2, a third resistor R3, a third capacitor C3, a controller U1, a fourth resistor R4, a fifth resistor R5, a second inductor L2, a first diode D1, a second diode D2, and a first switch Q1 (GND represents ground). In one embodiment, the controller U1 may be a microcontroller (MCU), a central processing unit (CPU), an application-specific integrated circuit chip (ASIC), a field-programmable gate array (FPGA), or other similar component. The circuit structure and operating mechanism of the conversion module 12 described above are well known to the art, and therefore a detailed explanation is omitted here.

[0044] The output filter module 13 is connected to the positive terminal V+ and negative terminal V- of the load LD and includes a filter unit 131 and a protection unit 132. The filter unit 131 is connected to the conversion module 12. In this embodiment, the filter unit 131 is an electrolytic capacitor EC1. The protection unit 132 is connected to the filter unit 131 and the conversion module 12. The protection unit 132 includes a current limiting member 1321 and a switching member 1322 connected in parallel with each other. The protection unit 132 also includes a control resistor Rc and a discharge resistor Rf. In this embodiment, the current limiting member 1321 is a thermistor Rt, and the switching member 1322 is a transistor Qs (metal oxide semiconductor field-effect transistor). In this embodiment, the load LD includes a plurality of light-emitting diodes LS connected in series with each other.

[0045] One end of the current limiting member 1321 and the drain (first end) of the switching member 1322 are connected to the first node N1, and the other end of the current limiting member 1321 and the source (second end) of the switching member 1322 are connected to the second node N2. The gate (third end) of the switching member 1322 is connected to the third node N3. The first node N1 is connected to the filter unit 131. The second node N2 is connected to the conversion module 12. The third node N3 is connected to the power supply node Np via a control resistor Rc. One end of the discharge resistor Rf is connected to the third node N3, and the other end of the discharge resistor Rf is connected to the second node N2. In this embodiment, the voltage at the power supply node Np is equal to the terminal voltage of the two light-emitting diodes LS (the position of the power supply node Np can be adjusted as needed), and this voltage must be sufficient to drive the switching member 1322.

[0046] Similarly, the rectifier module 11 receives the input voltage of the external power supply PS via the input module 10 and generates a rectified voltage. The conversion module 12 converts the rectified voltage to generate a drive voltage and charges the filter unit 131. When the filter unit 131 is charging, the switching member 1322 is off. At this time, the protection unit 132 functions as an effective protection circuit, and the current limiting member 1321 is connected in series with the filter unit 131 when it is charging to provide a current limiting effect. Therefore, the protection unit 132 can effectively reduce the inrush current.

[0047] When the load LD enters the operating state, the switching member 1322 turns on, causing the current limiting member 1321 to short-circuit. At this time, the protection unit 132 can temporarily short-circuit the current limiting member 1321 when the switching member 1322 transitions to the operating state of the load LD, thereby preventing energy loss. Since the control resistor Rc is installed between the third node N3 and the power supply node Np, the drive current that turns on the switching member 1322 can be suppressed, thus avoiding affecting the brightness of the load LD.

[0048] When the load LD enters an open-circuit state, the discharge resistor Rf discharges to turn off the switching member 1322, ensuring that the switching member 1322 turns off in a timely manner when the load LD transitions to an open-circuit state. At this time, the open-circuit voltage is simultaneously applied to the filter unit 131 and the current limiting member 1321. At this time, the current limiting member 1321 can provide a voltage division effect, reducing the voltage received by the filter unit 131.

[0049] As described above, the protection unit 132 functions as an effective protection circuit, and the current limiting member 1321 can provide a current limiting effect by connecting in series with the filter unit 131 when the filter unit 131 is charging, thereby effectively reducing inrush current and preventing the occurrence of overload conditions. Therefore, the safety of the drive power supply 1 can be greatly improved.

[0050] In this embodiment, the protection unit 132 can temporarily short-circuit the current limiting member 1321 when the switching member 1322 transitions the load LD to an operating state, thereby preventing energy loss. Therefore, the operating efficiency of the drive power supply 1 can be significantly improved without affecting its safety.

[0051] Furthermore, in this embodiment, the switching member 1322 turns off when the load LD enters an open-circuit state, simultaneously applying the open-circuit voltage to the filter unit 131 and the current limiting member 1321. At this time, the current limiting member 1321 can provide a voltage division effect, reducing the voltage received by the filter unit 131. The above mechanism effectively prevents the filter unit 131 from being damaged by high voltage, improving the reliability and service life of the drive power supply 1. In addition, the filter unit 131 does not require the use of high-voltage capacitors, further reducing the cost of the drive power supply 1.

[0052] Furthermore, in this embodiment, the circuit design described above can reduce the influence on the brightness of the load LD when the switching member 1322 is ON. Therefore, the load LD can still achieve high efficiency and meet the requirements of actual applications.

[0053] Furthermore, in this embodiment, the discharge resistor Rf ensures that the current limiting member 1321 provides a voltage divider effect, reducing the voltage received by the filter unit 131 and effectively preventing the filter unit 131 from being damaged by high voltage.

[0054] As described above, the protection unit 132 is indeed a multi-functional protection circuit having a multi-functional protection mechanism.

[0055] Naturally, this embodiment is for illustrative purposes only and does not limit the scope of the present invention, and equivalent modifications or changes made based on the drive power supply with the multi-function protection circuit of this embodiment should still be included within the scope of protection of the present invention.

[0056] In summary, according to an embodiment of the present invention, the drive power supply 1 includes a rectifier module 11, a conversion module 12, and an output filter module 13. The rectifier module 11 is connected to an external power supply PS. The conversion module 12 is connected to the rectifier module 11. The output filter module 13 is connected to a load LD and includes a filter unit 131 and a protection unit 132. The filter unit 131 is connected to the conversion module 12. The protection unit 132 is connected to both the filter unit 131 and the conversion module 12. The protection unit 132 includes a current limiting member 1321 and a switching member 1322 connected in parallel to each other. The rectifier module 11 receives the input voltage of the external power supply PS and generates a rectified voltage, and the conversion module 12 converts the rectified voltage to generate a drive voltage and charges the filter unit 131. The switching member 1322 is off when the filter unit 131 is being charged. The aforementioned protection unit 132 can function as an effective protection circuit, and by connecting the current limiting member 1321 in series with the filter unit 131 when the filter unit 131 is charging, it provides a current limiting effect, effectively reducing inrush current and preventing the occurrence of overload conditions. Therefore, the safety of the drive power supply 1 can be greatly improved.

[0057] According to an embodiment of the present invention, the output filter module 13 of the drive power supply 1 includes a protection unit 132, which includes a current limiting member 1321 and a switching member 1322 connected in parallel to each other. The switching member 1322 turns on when the load LD enters an operating state, causing the current limiting member 1321 to enter a short-circuit state. Through the above mechanism, the protection unit 132 can temporarily short-circuit the current limiting member 1321 when the switching member 1322 transitions to an operating state of the load LD, thereby preventing energy loss. Therefore, the operating efficiency of the drive power supply 1 can be significantly improved without affecting its safety.

[0058] Furthermore, according to an embodiment of the present invention, the output filter module 13 of the drive power supply 1 includes a protection unit 132, which includes a current limiting member 1321 and a switching member 1322 connected in parallel to each other. The switching member 1322 turns off when the load LD enters an open circuit state, causing the open circuit voltage to be simultaneously applied to the filter unit 131 and the current limiting member 1321. At this time, the current limiting member 1321 can provide a voltage division effect, reducing the voltage received by the filter unit 131. The above mechanism can effectively prevent the filter unit 131 from being damaged by high voltage, improving the reliability and service life of the drive power supply 1. In addition, the filter unit 131 does not require the use of high-voltage capacitors, further reducing the cost of the drive power supply 1.

[0059] Furthermore, according to an embodiment of the present invention, the output filter module 13 of the drive power supply 1 includes a protection unit 132, and the protection unit 132 includes a current limiting member 1321 and a switching member 1322 connected in parallel to each other. The current limiting member 1321 may be a thermistor Rt. Therefore, when the temperature rises, the resistance value of the current limiting member 1321 also rises accordingly, improving the voltage division effect of the current limiting member 1321 and further reducing the voltage received by the filter unit 131. Thus, the reliability and service life of the drive power supply 1 can be further improved, and the cost of the drive power supply 1 can also be further reduced.

[0060] Furthermore, according to an embodiment of the present invention, the output filter module 13 of the drive power supply 1 includes a protection unit 132, which includes a current limiting member 1321 and a switching member 1322 connected in parallel with each other. One end of the current limiting member 1321 and the first end of the switching member 1322 are connected to a first node N1, and the other end of the current limiting member 1321 and the second end of the switching member 1322 are connected to a second node N2. The third end of the switching member 1322 is connected to a third node N3. The first node N1 is connected to the filter unit 131. The second node N2 is connected to the conversion module 12, and the third node N3 is connected to the power supply node Np. The protection unit 132 may further include a control resistor Rc. The third node N3 is connected to the power supply node Np via the control resistor Rc. The above circuit design can reduce the impact on the brightness of the load LD when the switching member 1322 is turned on. Therefore, the load LD can still achieve high efficiency and meet the requirements of practical applications.

[0061] Furthermore, according to embodiments of the present invention, the protection unit 132 of the output filter module 13 of the drive power supply 1 may further include a discharge resistor Rf. One end of the discharge resistor Rf is connected to a third node N3, and the other end of the discharge resistor Rf is connected to a second node N2. The discharge resistor can discharge when the load LD enters an open circuit state to turn off the switching member 1322, ensuring that the switching member 1322 turns off in a timely manner when the load LD enters an open circuit state. Thus, the discharge resistor Rf ensures that the current limiting member 1321 can provide a voltage division effect, reducing the voltage received by the filter unit 131 and effectively preventing the filter unit 131 from being damaged by high voltage.

[0062] 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]

[0063] 1 Power supply 10 Input Modules 11 Rectifier Module 12 Conversion Modules 13 Output Filter Module 131 Filter Unit 132 protective units 1321 Current limiting member 1322 Opening / closing member Lt Live Line Input Terminal Nt Neutral wire input terminal BD1 Rectifier Bridge C1 First capacitor C2 Second capacitor C3 Third capacitor EC1 electrolytic capacitor R1 is the first resistor. R2 2nd resistor R3 3rd resistor R4 4th resistor R5 5th resistor Rc control resistor Rf discharge resistance Rt thermistor L1 First Inductor L2 Second Inductor U1 Controller D1 First Diode D2 Second Bypass Q1 First opening / closing Qs transistor GND (Ground) LD load V+ positive terminal of the load V - Negative load LS Light-Emitting Diode PS external power supply N1 First Node N2 Second Node N3 3rd Node Np Power Supply Node

Claims

1. A rectifier module connected to an external power supply, A conversion module connected to the rectifier module, A drive power supply connected to a load, comprising a filter unit and a protection unit, wherein the filter unit is connected to the conversion module, the protection unit is connected to the filter unit and the conversion module, and the protection unit comprises a multi-function protection circuit including current limiting members and switching members connected in parallel to each other.

2. The drive power supply equipped with a multi-functional protection circuit according to claim 1, characterized in that the load includes a plurality of light sources connected in series with each other, the switching member is connected to a power supply node, and the power supply node is installed between the plurality of light sources.

3. A drive power supply equipped with a multi-function protection circuit according to claim 2, characterized in that one end of the current limiting member and the first end of the switching member are connected to a first node, the other end of the current limiting member and the second end of the switching member are connected to a second node, the third end of the switching member is connected to a third node, the first node is connected to the filter unit, the second node is connected to the conversion module, and the third node is connected to the power supply node.

4. A drive power supply equipped with a multi-functional protection circuit according to claim 3, characterized in that the protection unit further includes a control resistor, and the third node is connected to the power supply node via the control resistor.

5. The drive power supply equipped with a multi-functional protection circuit according to claim 3, wherein the protection unit further includes a discharge resistor, one end of the discharge resistor is connected to the third node, and the other end of the discharge resistor is connected to the second node.

6. A drive power supply equipped with a multi-function protection circuit according to claim 1, characterized in that the rectifier module receives the input voltage of the external power supply and generates a rectified voltage, the conversion module converts the rectified voltage to generate a drive voltage and charges the filter unit, and the switching member is off when the filter unit is being charged.

7. The drive power supply equipped with a multi-functional protection circuit according to claim 6, characterized in that the switching member turns on when the load enters an operating state and causes the current limiting member to enter a short-circuit state.

8. The drive power supply equipped with the multi-functional protection circuit according to claim 7, characterized in that the switching member turns off when the load enters an open circuit state.

9. The drive power supply equipped with the multi-functional protection circuit according to claim 1, characterized in that the current limiting member is a thermistor.

10. The drive power supply equipped with a multi-functional protection circuit according to claim 1, characterized in that the filter unit is an electrolytic capacitor.

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