Illumination device equipped with transient current suppression function

Abstract

To provide an illumination device equipped with a transient current suppression function.SOLUTION: An illumination device equipped with a transient current suppression function includes a rectifier circuit, a first filter capacitor, a resistance member, a transient current suppression circuit and a voltage-dividing circuit. Both ends of the first filter capacitor are severally connected to a first node and a second node. The first node is connected to a first output terminal of the rectifier circuit, and the second node is connected to a ground point. Both ends of the resistance member are severally connected to the second node and a third node, and the third node is connected to a second output terminal of the rectifier circuit. The transient current suppression circuit includes a switch and a first adjusting capacitor. A first terminal, a second terminal and a third terminal of the switch are connected to a fourth node, the second node and the third node respectively. Both ends of the first adjusting capacitor are connected to the second node and the third node. Both ends of the voltage-dividing circuit are severally connected to the first node and the fourth node.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a lighting device, and more particularly to a lighting device having a transient current suppression function. [Background technology]

[0002] Many factories require a large number of high-power lighting devices (triple-proof lights, panel lights, high bay lights, etc.). This is because it is necessary to use a series circuit consisting of an air switch and multiple lighting devices to reduce the complexity of wiring and the number of control switches. However, since a large transient current occurs when the air switch is turned on, it is necessary to reduce the number of lighting devices in the series circuit, and the air switch cannot achieve its maximum effect. For example, although 16 lighting devices can be installed on an air switch (such as C16), if the transient current of the series circuit of 16 lighting devices is too large (if the current exceeds the rated current of the air switch), the air switch will trip, so only 10 lighting devices can be installed on the air switch.

[0003] Although China Patent Application Publication No. 110798937 and China Patent Application Publication No. 114980415 both disclose technical content related to transient current suppression, they still fail to effectively solve the problems of the prior art. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] China Patent Publication No. 110798937 [Patent Document 2] China Patent Application Publication No. 114980415 Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a lighting device with a transient current suppression function. [Means for solving the problem]

[0006] One embodiment of the present invention provides a lighting device with a transient current suppression function, which includes a rectifier circuit, a first filter capacitor, a resistive member, a transient current suppression circuit, and a voltage divider circuit. One end of the first filter capacitor is connected to a first node, and the other end of the first filter capacitor is connected to a second node. The first node is connected to a first output terminal of the rectifier circuit, and the second node is connected to a ground point. One end of the resistive member is connected to the second node, and the other end of the resistive member is connected to a third node. The third node is connected to a second output terminal of the rectifier circuit. The transient current suppression circuit includes a switch and a first adjustment capacitor. A first terminal of the switch is connected to a fourth node, a second terminal of the switch is connected to the second node, and a third terminal of the switch is connected to the third node. One end of the first adjustment capacitor is connected to the second node, and the other end of the first adjustment capacitor is connected to the third node. One end of the voltage divider circuit is connected to the first node, and the other end of the voltage divider circuit is connected to the fourth node.

[0007] In one embodiment of the present invention, the capacitance value of the first tuning capacitor is related to the on-delay time of the switch.

[0008] In one embodiment of the present invention, the switch is turned on the moment the rectifier circuit is connected to an external power source and returns to an off state after the transient current has been suppressed.

[0009] In one embodiment of the present invention, the transient current suppression circuit further includes a Zener diode, one end of the Zener diode is connected to the second node and the other end of the Zener diode is connected to the fourth node.

[0010] In one embodiment of the present invention, the lighting device further includes an auxiliary resistor, and one end of the resistive member is connected to the second node via the auxiliary resistor.

[0011] In one embodiment of the present invention, the voltage divider circuit includes a first resistor group and a second resistor group, one end of the first resistor group is connected to a first node, and the other end of the first resistor group is connected to a fourth node and to the second resistor group.

[0012] In one embodiment of the present invention, the voltage divider circuit further includes a second adjustment capacitor and a fifth resistor, the second adjustment capacitor is connected in parallel with the second resistor group, and the other end of the first resistor group is connected to a fourth node via the fifth resistor.

[0013] In one embodiment of the present invention, the capacitance value of the second tuning capacitor is related to the on-delay time of the switch.

[0014] In one embodiment of the present invention, the switch is a metal oxide semiconductor field effect transistor or a triode.

[0015] In one embodiment of the invention, the resistive element is a thermistor (such as a negative temperature coefficient thermistor), a cement resistor or a carbon film resistor or other similar element. Effect of the Invention

[0016] Based on the above, a lighting device with transient current suppression functionality according to embodiments of the present invention may have one or more of the following advantages. (1) The lighting device includes a rectifier circuit, a first filter capacitor, a resistive element, a transient current suppression circuit, and a voltage divider circuit. The rectifier circuit is connected to a live line output terminal and a neutral line output terminal of an air switch. One end of the first filter capacitor is connected to a first node, and the other end of the first filter capacitor is connected to a second node. The first node is connected to a first output terminal of the rectifier circuit, and the second node is connected to a ground point. One end of the resistive element is connected to the second node, and the other end of the resistive element is connected to a third node. The third node is connected to a second output terminal of the rectifier circuit. The transient current suppression circuit includes a switch and a first adjustment capacitor. A first terminal of the switch is connected to a fourth node, a second terminal of the switch is connected to the second node, and a third terminal of the switch is connected to the third node. One end of the first adjustment capacitor is connected to the second node, and the other end of the first adjustment capacitor is connected to the third node. One end of the voltage divider circuit is connected to the first node, and the other end of the voltage divider circuit is connected to the fourth node. The above-mentioned transient current suppression circuit can keep the switch in the off state at the moment when the lighting device is connected to an external power source (the moment when the air switch is turned on), and can cause the resistance member to provide a current limiting function for the current supplied to other circuit members of the lighting device. In this way, the transient current suppression circuit can effectively realize the transient current suppression function. Then, when the transient current is effectively suppressed, the transient current suppression circuit controls the switch to return to the on state, causing the resistance member to be in a short-circuit state, so that the current supplied to other circuit members of the lighting device is not limited by the resistance member. Therefore, the transient current of the lighting device can be effectively reduced, and the air switch can be connected in series with more lighting devices. Therefore, the air switch can exert its maximum effect. (2) The voltage divider circuit of the lighting device further includes a second adjustment capacitor, and the capacitance values ​​of the first adjustment capacitor and the second adjustment capacitor are related to the on-delay time of the switch. Therefore, the voltage divider circuit of the lighting device also has an auxiliary circuit that assists the transient current suppression function. Therefore, by adjusting the capacitance value of the first adjustment capacitor and the capacitance value of the second adjustment capacitor, the on-delay time of the switch can be appropriately changed, and a more effective transient current suppression function can be obtained. Therefore, the circuit of the lighting device can achieve higher stability. (3) The lighting device further includes an auxiliary resistor, and one end of the resistive element is connected to the second node through the auxiliary resistor. The above-mentioned auxiliary resistor can effectively reduce the influence of the environmental temperature on the resistive element, and can prevent the resistance value of the resistive element from being easily changed by environmental factors. Through the above-mentioned circuit design, the transient current suppression function can be further improved. Therefore, the lighting device can be used more flexibly and can better meet the needs of practical applications. (4) The lighting device provides effective transient current suppression function and can achieve higher stability, making the lighting device applicable to various different places such as factories, mines, stores, etc. Therefore, the application of the lighting device can be broadened and the requirements of different applications can be met. (5) The circuit design of the lighting device is simple, so that the desired effect can be obtained without significantly increasing the cost, thereby reducing the overall cost of the lighting device and making the lighting device more practical. [Brief description of the drawings]

[0017] [Figure 1] 1 is a block diagram of a circuit configuration of a lighting device having a transient current suppression function according to a first embodiment of the present invention. [Diagram 2] 1 is a circuit diagram of a lighting device having a transient current suppression function according to a first embodiment of the present invention. [Diagram 3] FIG. 2 is an explanatory diagram of a usage state of the lighting device having a transient current suppression function according to the first embodiment of the present invention. [Figure 4]FIG. 11 is a circuit diagram of a lighting device having a transient current suppression function according to a second embodiment of the present invention. [Diagram 5] FIG. 11 is a circuit diagram of a lighting device having a transient current suppression function according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] In the following embodiments, detailed features and advantages of the present invention are described, the contents of which are sufficient to enable those skilled in the art to understand the technical contents of the present invention and implement them accordingly, and the disclosure contents, claims and drawings in this specification enable those skilled in the art to easily understand the objectives and advantages of the present invention.

[0019] Hereinafter, an embodiment of a lighting device with a transient current suppression function of the present invention will be described with reference to the related drawings. For ease of understanding and ease of description 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, there is no intermediate member, and other terms for describing the relationship between members or layers should be interpreted in the same manner. For ease of understanding, the same members in the following embodiments will be denoted and described with the same reference numerals.

[0020] 1 is a block diagram of a circuit configuration of a lighting device having a transient current suppression function according to a first embodiment of the present invention. The lighting device 1 includes a rectifier circuit 11, a first filter capacitor CX1, a resistive element Rn, a transient current suppression circuit 12, a voltage divider circuit 13, a voltage conversion circuit 14, and a light source 15.

[0021] The rectifier circuit 11 has a live line terminal LT and a neutral line terminal NT, and can be connected to an external power source (such as a commercial power source or other AC power source) via an air switch. A first output terminal T1 of the rectifier circuit 11 is connected to a first node N1, and a second output terminal T2 of the rectifier circuit 11 is connected to a third node N3.

[0022] One end of the first filter capacitor CX1 is connected to a first node N1, and the other end of the first filter capacitor CX1 is connected to a second node N2. The second node N2 is connected to the ground point GND.

[0023] One end of the resistive element Rn is connected to the second node N2, and the other end of the resistive element Rn is connected to the third node N3. In this embodiment, the resistive element Rn is a thermistor (such as a negative temperature coefficient thermistor). In another embodiment, the resistive element Rn may be a cement resistor, a carbon film resistor, or other conventional resistor.

[0024] A first terminal of the transient current suppression circuit 12 is connected to a third node N3, a second terminal of the transient current suppression circuit 12 is connected to a second node N2, and a third terminal of the transient current suppression circuit 12 is connected to a node N4.

[0025] One end of the voltage dividing circuit 13 is connected to a first node N1, and the other end of the voltage dividing circuit 13 is connected to a fourth node N4.

[0026] One end of the voltage conversion circuit 14 is connected to a first node N1, and the other end of the voltage conversion circuit 14 is connected to a fourth node N4. In this embodiment, the voltage conversion circuit 14 may be a DC / DC converter such as a step-up converter, a step-down converter, or a step-up / step-down converter.

[0027] The light source 15 is connected to the voltage conversion circuit 14. In this embodiment, the light source 15 may be a light emitting diode, a light emitting diode array, or other similar components. In another embodiment, the light source 15 may be a fluorescent lamp, a light bulb, or other similar components. With the above circuit configuration, an external power source can drive the light source 15.

[0028] Of course, this embodiment is only used for illustrative purposes and does not limit the scope of the present invention, and any equivalent modifications or changes made based on the lighting device 1 with the transient current suppression function of the embodiment should still fall within the protection scope of the present invention.

[0029] FIG. 2 is a circuit diagram of a lighting device having a transient current suppression function according to the first embodiment of the present invention, and FIG. 1 is referred to together with FIG. 2. As shown in FIG. 1, the lighting device 1 includes a rectifier circuit 11, a first filter capacitor CX1, a resistive member Rn, a transient current suppression circuit 12, a voltage dividing circuit 13, a voltage conversion circuit 14, and a light source 15. FIG. 2 illustrates the circuit configurations of the rectifier circuit 11, the transient current suppression circuit 12, and the voltage dividing circuit 13 of the lighting device 1, but the circuit configurations of the rectifier circuit 11, the transient current suppression circuit 12, and the voltage dividing circuit 13 can be changed as necessary. As shown in FIG. 2, the rectifier circuit 11 has a live line terminal LT and a neutral line terminal NT, and includes a fuse Fs, a common-mode inductor Lf, a second filter capacitor CX2, and a bridge rectifier Br. One input terminal of the common-mode inductor Lf is connected to the live line terminal LT via the fuse Fs, and the other input terminal of the common-mode inductor Lf is connected to the neutral line terminal NT. The two output terminals of the in-phase inductor Lf are respectively connected to the two terminals of the second filter capacitor CX2, and the two terminals of the second filter capacitor CX2 are respectively connected to the two input terminals I1, I2 of the bridge rectifier Br. The in-phase inductor Lf provides an isolation function, and when the lighting device 1 is connected to an external power supply (when the air switch is on), it can prevent the second filter capacitor CX2 from being charged, which would cause the air switch to trip (when the current exceeds the rated current of the air switch, the air switch will trip).

[0030] One end of the first filter capacitor CX1 is connected to a first node N1, and the other end of the first filter capacitor CX1 is connected to a second node N2. The first node N1 is connected to a first output terminal T1 of the rectifier circuit 11 (bridge rectifier Br), and the second node N2 is connected to ground GND.

[0031] One end of the resistive element Rn is connected to a second node N2, and the other end of the resistive element Rn is connected to a third node N3. The third node N3 is connected to a second output terminal T2 of the rectifier circuit 11 (bridge rectifier Br).

[0032] The transient current suppression circuit 12 includes a switch Sw, a first adjustment capacitor C1, and a Zener diode Zd. A first terminal (gate) of the switch Sw is connected to a fourth node N4, a second terminal (source) of the switch Sw is connected to a second node N2, and a third terminal (drain) of the switch Sw is connected to a third node N3. One end of the first adjustment capacitor C1 is connected to the second node N2, and the other end of the first adjustment capacitor C1 is connected to the third node N3. In this embodiment, the switch Sw is a metal oxide semiconductor field effect transistor (MOSFET). In another embodiment, the switch Sw may be a biased junction transistor (BJT) or other similar member. One end of the Zener diode Zd is connected to the second node N2, and the other end of the Zener diode Zd is connected to the fourth node N4. The Zener diode Zd can adjust the voltage applied to the first terminal (gate) of the switch Sw and prevent the above voltage from becoming too high.

[0033] The voltage divider circuit 13 includes a first resistor group, a second resistor group, a second adjustment capacitor C2, and a fifth resistor R5, and can generate a voltage to be applied to the first terminal (gate) of the switch Sw. The first resistor group may include one or more resistors. In this embodiment, the first resistor group includes a first resistor R1, a second resistor R2, and a third resistor R3 connected in series (the number of resistors in the first resistor group can be changed according to actual needs). The second resistor group may include one or more resistors. In this embodiment, the second resistor group includes a fourth resistor R4 (the number of resistors in the second resistor group can be changed according to actual needs). One end of the first resistor group is connected to the first node N1, and the other end of the first resistor group is connected to the fourth node N4 and the second resistor group via the fifth resistor R5. The second adjustment capacitor C2 is connected in parallel with the second resistor group (the fourth resistor R4).

[0034] At the moment when the lighting device 1 (rectifier circuit 11) is connected to the external power source (the air switch is turned on), the switch Sw maintains the off state. At this time, a current flows through the resistance element Rn, causing the resistance element Rn to provide a current limiting function for the current supplied to other circuit elements of the lighting device 1. After that, when the on-delay time has elapsed, the transient current is effectively suppressed. At this time, the switch Sw is turned on, the resistance element Rn is short-circuited, and the current supplied to other circuit elements of the lighting device 1 is no longer limited by the resistance element Rn. When the lighting device 1 is connected to the external power source (the air switch is turned on), the first adjustment capacitor C1 and the second adjustment capacitor C2 are charged, and the first adjustment capacitor C1 and the second adjustment capacitor C2 later supply a voltage to the switch Sw so that the switch Sw can be turned on.

[0035] The capacitance value of the first adjustment capacitor C1 and the capacitance value of the second adjustment capacitor C2 are related to the on-delay time of the switch Sw. The capacitance value of the first adjustment capacitor C1 is proportional to the on-delay time of the switch Sw, and the capacitance value of the second adjustment capacitor C2 is also proportional to the on-delay time of the switch Sw. The first adjustment capacitor C1 is installed in the transient current suppression circuit 12, and the second adjustment capacitor C2 is installed in the voltage dividing circuit 13, and the above circuits make the circuit design of the lighting device 1 more flexible and can better meet the requirements of different applications. Therefore, by adjusting the capacitance value of the first adjustment capacitor C1 and the capacitance value of the second adjustment capacitor C2, the on-delay time of the switch Sw can be appropriately changed, and the transient current suppression function can be more effectively provided. For example, by adjusting the capacitance value of the first adjustment capacitor C1 and the capacitance value of the second adjustment capacitor C2, the on-delay time of the switch Sw can be about 10ms to 100ms (the on-delay time of the switch Sw can be adjusted according to actual needs). The switch Sw needs to be turned on at a time that avoids the generation of a transient current when the first filter capacitor CX1 is charged. In addition, the resistance value of the fifth resistor R5 is related to the on-delay time of the switch Sw, and the on-delay time of the switch Sw can be changed by adjusting the resistance value of the fifth resistor R5.

[0036] The above-mentioned transient current suppression circuit 12 and its operation mechanism can effectively provide a transient current suppression function. Therefore, the transient current of the lighting device 1 can be effectively reduced, and the air switch can be connected in series with more lighting devices 1. Therefore, the air switch can exert its maximum effect.

[0037] As described above, the voltage divider circuit 13 further includes the second adjustment capacitor C1, and the capacitance value of the first adjustment capacitor C1 and the capacitance value of the second adjustment capacitor C2 relate to the on-delay time of the switch. Therefore, the voltage divider circuit 12 of the lighting device 1 also has an auxiliary circuit that assists the transient current suppression function. Therefore, by adjusting the capacitance value of the first adjustment capacitor C1 and the capacitance value of the second adjustment capacitor C2, the on-delay time of the switch Sw can be appropriately changed, and the transient current suppression function can be more effectively provided. Therefore, the circuit of the lighting device 1 can achieve higher stability.

[0038] Of course, this embodiment is only used for illustrative purposes and does not limit the scope of the present invention, and any equivalent modifications or changes made based on the lighting device 1 with the transient current suppression function of the embodiment should still fall within the protection scope of the present invention.

[0039] 3 is an explanatory diagram of a usage state of a lighting device 1 with a transient current suppression function according to the first embodiment of the present invention. As shown in the figure, multiple lighting devices 1 can be connected in series to an air switch AS (L represents the live line terminal of the air switch AS, N represents the neutral line terminal of the air switch AS, and G is the ground terminal of the air switch AS, which is connected to an external power source). The circuit design of this embodiment can effectively reduce the transient current of each lighting device 1, and the air switch AS can be connected in series with more lighting devices 1. Therefore, the air switch AS can exert its maximum effect.

[0040] Of course, this embodiment is only used for illustrative purposes and does not limit the scope of the present invention, and any equivalent modifications or changes made based on the lighting device 1 with the transient current suppression function of the embodiment should still fall within the protection scope of the present invention.

[0041] FIG. 4 is a circuit diagram of a lighting device having a transient current suppression function according to a second embodiment of the present invention, and FIG. 1 is referred to at the same time as FIG. 4. As shown in FIG. 1, the lighting device 1 includes a rectifier circuit 11, a first filter capacitor CX1, a resistive element Rn, a transient current suppression circuit 12, a voltage dividing circuit 13, a voltage conversion circuit 14, and a light source 15. FIG. 4 illustrates the circuit configurations of the rectifier circuit 11, the transient current suppression circuit 12, and the voltage dividing circuit 13 of the lighting device 1, but the circuit configurations of the rectifier circuit 11, the transient current suppression circuit 12, and the voltage can be changed according to actual needs. FIG. 4 also illustrates the connection relationship of the rectifier circuit 11, the first filter capacitor CX1, the resistive element Rn, the transient current suppression circuit 12, and the voltage dividing circuit 13.

[0042] The above members are the same as those in the previous embodiment, and therefore will not be described in detail here. The difference from the previous embodiment is that the lighting device 1 of this embodiment further includes an auxiliary resistor Rs. One end of the resistor Rn is connected to the second node N2 via the auxiliary resistor Rs, and the other end of the resistor Rn is connected to the third node N3.

[0043] From the above, it can be seen that the lighting device 1 further includes an auxiliary resistor Rs, and one end of the resistive element Rn is connected to the second node N2 through the auxiliary resistor Rs. The above-mentioned auxiliary resistor Rs can effectively reduce the influence of the environmental temperature on the resistive element Rn, so that the resistance value of the resistive element Rn is not easily changed by environmental factors. The above circuit design can further improve the transient current suppression function. Therefore, the use of the lighting device 1 can be made more flexible and can better meet the needs of practical applications.

[0044] Similarly, the above-mentioned transient current suppression circuit 12 and its operation mechanism can effectively provide a transient current suppression function. Therefore, the transient current of the lighting device 1 can be effectively reduced, and the air switch can be connected in series with more lighting devices 1. Therefore, the air switch can exert its maximum effect.

[0045] Of course, this embodiment is only used for illustrative purposes and does not limit the scope of the present invention, and any equivalent modifications or changes made based on the lighting device 1 with the transient current suppression function of the embodiment should still fall within the protection scope of the present invention.

[0046] In addition, the transient current of the conventional lighting device cannot be effectively reduced, so that the air switch cannot exert the maximum effect. In contrast, according to the first and second embodiments of the present invention, the lighting device includes a rectifier circuit, a first filter capacitor, a resistive member, a transient current suppression circuit, and a voltage dividing circuit. The rectifier circuit is connected to the live line output terminal and the neutral line output terminal of the air switch. One end of the first filter capacitor is connected to a first node, and the other end of the first filter capacitor is connected to a second node. The first node is connected to a first output terminal of the rectifier circuit, and the second node is connected to a ground point. One end of the resistive member is connected to the second node, and the other end of the resistive member is connected to a third node. The third node is connected to a second output terminal of the rectifier circuit. The transient current suppression circuit includes a switch and a first adjustment capacitor. The first terminal of the switch is connected to a fourth node, the second terminal of the switch is connected to the second node, and the third terminal of the switch is connected to the third node. One end of the first adjustment capacitor is connected to the second node, and the other end of the first adjustment capacitor is connected to the third node. One end of the voltage divider circuit is connected to the first node, and the other end of the voltage divider circuit is connected to the fourth node. The above-mentioned transient current suppression circuit can keep the switch in the off state at the moment when the lighting device is connected to the external power source (the moment when the air switch is turned on), and can cause the resistance member to provide a current limiting function for the current supplied to other circuit members of the lighting device. In this way, the transient current suppression circuit can effectively realize the transient current suppression function. Then, when the transient current is effectively suppressed, the transient current suppression circuit controls the switch to return to the on state, causing the resistance member to be in a short-circuit state, so that the current supplied to other circuit members of the lighting device is not limited by the resistance member. Therefore, the transient current of the lighting device can be effectively reduced, and the air switch can be connected in series with more lighting devices. Therefore, the air switch can exert its maximum effect.

[0047] Also, according to the first and second embodiments of the present invention, the voltage divider circuit of the lighting device further includes a second adjustment capacitor, and the capacitance values ​​of the first adjustment capacitor and the second adjustment capacitor are related to the on-delay time of the switch. Therefore, the voltage divider circuit of the lighting device also has an auxiliary circuit that assists the transient current suppression function. Therefore, by adjusting the capacitance value of the first adjustment capacitor and the capacitance value of the second adjustment capacitor, the on-delay time of the switch can be appropriately changed, and a more effective transient current suppression function can be obtained. Therefore, the circuit of the lighting device can achieve higher stability.

[0048] In addition, according to the first and second embodiments of the present invention, the lighting device further includes an auxiliary resistor, and one end of the resistive member is connected to the second node through the auxiliary resistor. The above-mentioned auxiliary resistor can effectively reduce the influence of the environmental temperature on the resistive member, and can prevent the resistance value of the resistive member from being easily changed by environmental factors. The above-mentioned circuit design can further improve the transient current suppression function. Therefore, the lighting device can be used more flexibly and can better meet the needs of practical applications.

[0049] Furthermore, according to the first and second embodiments of the present invention, the lighting device provides an effective transient current suppression function and can achieve higher stability, making the lighting device applicable to various different locations such as factories, mines, stores, etc. Therefore, the application of the lighting device can be broadened and the requirements of different applications can be met.

[0050] Furthermore, according to the first and second embodiments of the present invention, the circuit design of the lighting device is simple, so that the desired effect can be obtained without a significant increase in cost. Therefore, the overall cost of the lighting device can be reduced, and the lighting device can be made more practical. From the above, it can be seen that the lighting device with the transient current suppression function according to the embodiments of the present invention can indeed achieve excellent technical effects.

[0051] FIG. 5 is a circuit diagram of a lighting device having a transient current suppression function according to a second embodiment of the present invention, and FIG. 1 is referred to at the same time as FIG. 5. As shown in FIG. 1, the lighting device 1 includes a rectifier circuit 11, a first filter capacitor CX1, a resistive element Rn, a transient current suppression circuit 12, a voltage dividing circuit 13, a voltage conversion circuit 14, and a light source 15. FIG. 5 illustrates the circuit configurations of the rectifier circuit 11, the transient current suppression circuit 12, and the voltage dividing circuit 13 of the lighting device 1, but the circuit configurations of the rectifier circuit 11, the transient current suppression circuit 12, and the voltage can be changed according to actual needs. FIG. 5 also illustrates the connection relationship of the rectifier circuit 11, the first filter capacitor CX1, the resistive element Rn, the transient current suppression circuit 12, and the voltage dividing circuit 13.

[0052] The above members are the same as those in the previous embodiment, and will not be described in detail here. The difference from the previous embodiment is that in this embodiment, one end of the auxiliary resistor Rs is connected to the second node N2, and the other end of the auxiliary resistor Rs is connected to the third node N3. In addition, the resistive member Rn is installed between the other input terminal of the common-phase inductor Lf and the neutral line terminal NT. This circuit design can achieve the effects of the first and second embodiments in the same way.

[0053] Of course, this embodiment is only used for illustrative purposes and does not limit the scope of the present invention, and any equivalent modifications or changes made based on the lighting device 1 with the transient current suppression function of the embodiment should still fall within the protection scope of the present invention.

[0054] In summary, according to the first and second embodiments of the present invention, the lighting device includes a rectifier circuit, a first filter capacitor, a resistive member, a transient current suppression circuit, and a voltage divider circuit. The rectifier circuit is connected to the live line output terminal and the neutral line output terminal of the air switch. One end of the first filter capacitor is connected to a first node, and the other end of the first filter capacitor is connected to a second node. The first node is connected to a first output terminal of the rectifier circuit, and the second node is connected to a ground point. One end of the resistive member is connected to the second node, and the other end of the resistive member is connected to a third node. The third node is connected to a second output terminal of the rectifier circuit. The transient current suppression circuit includes a switch and a first adjustment capacitor. A first terminal of the switch is connected to a fourth node, a second terminal of the switch is connected to the second node, and a third terminal of the switch is connected to the third node. One end of the first adjustment capacitor is connected to the second node, and the other end of the first adjustment capacitor is connected to the third node. One end of the voltage divider circuit is connected to the first node, and the other end of the voltage divider circuit is connected to the fourth node. The above-mentioned transient current suppression circuit can keep the switch in the off state at the moment when the lighting device is connected to an external power source (the moment when the air switch is turned on), and can cause the resistance member to provide a current limiting function for the current supplied to other circuit members of the lighting device. In this way, the transient current suppression circuit can effectively realize the transient current suppression function. Then, when the transient current is effectively suppressed, the transient current suppression circuit controls the switch to return to the on state, causing the resistance member to be in a short-circuit state, so that the current supplied to other circuit members of the lighting device is not limited by the resistance member. Therefore, the transient current of the lighting device can be effectively reduced, and the air switch can be connected in series with more lighting devices. Therefore, the air switch can exert its maximum effect.

[0055] Also, according to the first and second embodiments of the present invention, the voltage divider circuit of the lighting device further includes a second adjustment capacitor, and the capacitance values ​​of the first adjustment capacitor and the second adjustment capacitor are related to the on-delay time of the switch. Therefore, the voltage divider circuit of the lighting device also has an auxiliary circuit that assists the transient current suppression function. Therefore, by adjusting the capacitance value of the first adjustment capacitor and the capacitance value of the second adjustment capacitor, the on-delay time of the switch can be appropriately changed, and a more effective transient current suppression function can be obtained. Therefore, the circuit of the lighting device can achieve higher stability.

[0056] In addition, according to the first and second embodiments of the present invention, the lighting device further includes an auxiliary resistor, and one end of the resistive member is connected to the second node through the auxiliary resistor. The above-mentioned auxiliary resistor can effectively reduce the influence of the environmental temperature on the resistive member, and can prevent the resistance value of the resistive member from being easily changed by environmental factors. The above-mentioned circuit design can further improve the transient current suppression function. Therefore, the lighting device can be used more flexibly and can better meet the needs of practical applications.

[0057] Furthermore, according to the first and second embodiments of the present invention, the lighting device provides an effective transient current suppression function and can achieve higher stability, making the lighting device applicable to various different locations such as factories, mines, stores, etc. Therefore, the application of the lighting device can be broadened and the requirements of different applications can be met.

[0058] Furthermore, according to the first and second embodiments of the present invention, the circuit design of the lighting device is simple, so that the desired effect can be obtained without a significant increase in cost. Therefore, the cost of the entire lighting device can be reduced, and the lighting device can be made more practical.

[0059] Although the above embodiments are described in this specification, it should be noted that they do not limit the scope of the claims of the present invention. Therefore, the changes and modifications to the embodiments described in this specification based on the innovative concept of the present invention, or the replacement of equivalent structures or equivalent processes made using the contents of the specification and drawings of the present invention, and the 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. [Explanation of symbols]

[0060] 1 Lighting equipment 11 Rectifier circuit 12 Transient current suppression circuit 13 Voltage divider circuit 14 Voltage conversion circuit 15 light source CX1 1st filter capacitor CX2 Second filter capacitor Rn Resistance material LT Rectifier circuit live line terminal NT Neutral terminal of rectifier circuit T1 First output terminal of the rectifier circuit (bridge rectifier) T2 Second output terminal of the rectifier circuit (bridge rectifier) I1 Bridge rectifier input terminal I2 Bridge rectifier input terminal N1 First node N2 Second node N3 Third node N4 Fourth Node Fs Fuse Lf Common mode inductor Br Bridge rectifier Zd Zener diode SW Switch C1 First adjustment capacitor C2 Second adjustment capacitor R1 First resistor R2 2nd resistor R3 3rd resistor R4 4th resistor R5 5th resistor Rs Auxiliary resistance GND Ground AS Air Switch L Air switch live wire terminal N Air switch neutral wire terminal G Air switch ground terminal

Claims

1. A lighting device equipped with a transient current suppression function, A rectifier circuit; a first filter capacitor having one end connected to a first node, the first node being connected to a first output terminal of the rectifier circuit, and the other end connected to a second node, the second node being connected to a second node; a resistor member having one end connected to a second node and the other end connected to a third node, the third node being connected to a second output terminal of the rectifier circuit; a transient current suppression circuit including a switch and a first adjustment capacitor, a first terminal of the switch being connected to a fourth node, a second terminal of the switch being connected to the second node, a third terminal of the switch being connected to the third node, one end of the first adjustment capacitor being connected to the second node, and the other end of the first adjustment capacitor being connected to the third node; a voltage divider circuit having one end connected to the first node and the other end connected to the fourth node; A lighting device with a transient current suppression function, comprising:

2. 2. The lighting device with a transient current suppression function according to claim 1, wherein a capacitance value of the first adjustment capacitor is related to an on-delay time of the switch.

3. 2. The lighting device with a transient current suppression function according to claim 1, wherein the switch becomes conductive the moment the rectifier circuit is connected to an external power source, and returns to an off state after the transient current is suppressed.

4. 2. The lighting device with a transient current suppression function according to claim 1, wherein the transient current suppression circuit further includes a Zener diode, one end of the Zener diode being connected to the second node and the other end of the Zener diode being connected to the fourth node.

5. The lighting device with a transient current suppression function according to claim 1 , further comprising an auxiliary resistor, one end of the resistive member being connected to the second node via the auxiliary resistor.

6. The lighting device with transient current suppression function described in claim 1, characterized in that the voltage divider circuit includes a first group of resistors and a second group of resistors, one end of the first group of resistors is connected to the first node, and the other end of the first group of resistors is connected to the fourth node and to the second group of resistors.

7. The lighting device with transient current suppression function described in claim 6, characterized in that the voltage divider circuit further includes a second adjustment capacitor and a fifth resistor, the second adjustment capacitor being connected in parallel with the second resistor group, and the other end of the first resistor group being connected to the fourth node via the fifth resistor.

8. 8. The lighting device with a transient current suppression function according to claim 7, wherein a capacitance value of the second adjustment capacitor is related to an on-delay time of the switch.

9. 2. The lighting device with transient current suppression function according to claim 1, wherein the switch is a metal oxide semiconductor field effect transistor or a triode.

10. 2. The lighting device with a transient current suppression function according to claim 1, wherein the resistive member is a thermistor, a cement resistor or a carbon film resistor.

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