Lighting device with transient current suppression function

Abstract

The application discloses a lighting device with transient current suppression function, which comprises a rectifier circuit, a first filter capacitor, a resistance component, a transient current suppression circuit and a voltage division circuit. Two ends of the first filter capacitor are connected with a first node and a second node respectively. The first node is connected with a first output end of the rectifier circuit, and the second node is connected with a grounding point. Two ends of the resistance component are connected with the second node and a third node respectively, and the third node is connected with a second output end of the rectifier circuit. The transient current suppression circuit comprises a switch and a first adjusting capacitor. A first end, a second end and a third end of the switch are connected with a fourth node, the second node and the third node respectively. Two ends of the first adjusting capacitor are connected with the second node and the third node respectively. Two ends of the voltage division circuit are connected with the first node and the fourth node respectively.

Description

Technical Field

[0001] This invention relates to a lighting device, and more particularly to a lighting device with transient current suppression function. Background Technology

[0002] Many factories require a large number of high-power lighting fixtures (such as tri-proof lights, panel lights, and industrial lamps). To reduce wiring complexity and the number of control switches, circuit breakers and serial circuits consisting of multiple lighting fixtures are needed. However, because circuit breakers generate high transient currents when turned on, the number of lighting fixtures in the serial circuit needs to be reduced, preventing the circuit breaker from achieving its maximum efficiency. For example, if a circuit breaker (such as C16) can accommodate 16 lighting fixtures, the transient current in the serial circuit of 16 lighting fixtures is too high (the circuit breaker trips when the current exceeds its rated current), so the circuit breaker can only accommodate 10 lighting fixtures.

[0003] Both Chinese patent publications CN110798937A and CN114980415A disclose technical content regarding the suppression of transient currents, but they still cannot effectively solve the problems of the prior art. Summary of the Invention

[0004] An embodiment of the present invention provides a lighting device with transient current suppression function, comprising a rectifier circuit, a first filter capacitor, a resistor assembly, 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 resistor assembly is connected to the second node, and the other end of the resistor assembly is connected to a third node. The third node is connected to the second output terminal of the rectifier circuit. The transient current suppression circuit includes a switch and a first regulating capacitor. The first end of the switch is connected to a fourth node, the second end of the switch is connected to the second node, and the third end of the switch is connected to the third node. One end of the first regulating capacitor is connected to the second node, and the other end of the voltage divider circuit is connected to the first node.

[0005] In one embodiment of the present invention, the capacitance value of the first regulating capacitor is related to the turn-on delay time of the switch.

[0006] In one embodiment of the present invention, the switch enters the on state the instant the rectifier circuit is connected to the external power supply to suppress transient current, and returns to the off state after the transient current is suppressed.

[0007] In one embodiment of the 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.

[0008] In one embodiment of the present invention, the lighting device further includes an auxiliary resistor, one end of which is connected to the second node via the auxiliary resistor.

[0009] 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 then connected to the second resistor group.

[0010] In one embodiment of the invention, the voltage divider circuit further includes a second regulating capacitor and a fifth resistor. The second regulating capacitor is connected in parallel with the second resistor group. The other end of the first resistor group is connected to the fourth node through the fifth resistor.

[0011] In one embodiment of the present invention, the capacitance value of the second regulating capacitor is related to the turn-on delay time of the switch.

[0012] In one embodiment of the present invention, the switch is a metal-oxide-semiconductor field-effect transistor or a triode.

[0013] In one embodiment of the present invention, the resistive component is a thermistor (such as a negative temperature coefficient thermistor), a cement resistor, a carbon film resistor, or other similar components.

[0014] As described above, the lighting device with transient current suppression function according to embodiments of the present invention may have one or more of the following advantages:

[0015] (1) The lighting device includes a rectifier circuit, a first filter capacitor, a resistor assembly, a transient current suppression circuit, and a voltage divider circuit. The rectifier circuit is connected to the live wire output terminal and the neutral wire output terminal of the air switch. One end of the first filter capacitor is connected to the first node, and the other end of the first filter capacitor is connected to the second node. The first node is connected to the first output terminal of the rectifier circuit, and the second node is connected to the ground point. One end of the resistor assembly is connected to the second node, and the other end of the resistor assembly is connected to the third node. The third node is connected to the second output terminal of the rectifier circuit. The transient current suppression circuit includes a switch and a first regulating capacitor. The first end of the switch is connected to the fourth node, the second end of the switch is connected to the second node, and the third end of the switch is connected to the third node. One end of the first regulating capacitor is connected to the second node, and the other end of the first regulating 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 aforementioned transient current suppression circuit can momentarily keep the switch off when the lighting device is connected to an external power source (when the circuit breaker is on), allowing the resistor component to limit the current supplied to other circuit components of the lighting device. In this way, the transient current suppression circuit effectively achieves its function of suppressing transient current. Then, once the transient current is effectively suppressed, the transient current suppression circuit can control the switch to return to the on state, causing the resistor component to enter a short-circuit state, so that the current supplied to other circuit components of the lighting device is not limited by the resistor component. Therefore, the transient current of the lighting device can be effectively reduced, allowing the circuit breaker to be connected in series with more lighting devices. Thus, the circuit breaker can achieve maximum efficiency.

[0016] (2) The voltage divider circuit of the lighting device also includes a second regulating capacitor. The capacitance values ​​of the first and second regulating capacitors are related to the on-time delay of the switch. Therefore, the voltage divider circuit of the lighting device also has an auxiliary circuit that can assist in the transient current suppression function. Thus, the on-time delay of the switch can be appropriately changed by adjusting the capacitance values ​​of the first and second regulating capacitors to more effectively provide transient current suppression. Therefore, the circuit of the lighting device can achieve higher stability.

[0017] (3) The lighting device also includes an auxiliary resistor, one end of which is connected to the second node. This auxiliary resistor effectively reduces the impact of ambient temperature on the resistor assembly, making its resistance value less susceptible to changes due to environmental factors. The circuit design further enhances transient current suppression. Therefore, the lighting device is more flexible in its use and better meets the needs of practical applications.

[0018] (4) The lighting device can provide effective transient current suppression and achieve higher stability, enabling it to be used in various locations such as factories, mines, and shopping malls. Therefore, the lighting device can be used more widely and can meet the needs of different applications.

[0019] (5) The circuit design of the lighting device is simple, so the desired effect can be achieved without significantly increasing the cost. Therefore, the overall cost of the lighting device can be reduced, making the lighting device more practical. Attached Figure Description

[0020] Figure 1 This is a block diagram of the circuit structure of a lighting device with transient current suppression function according to the first embodiment of the present invention;

[0021] Figure 2 This is a circuit diagram of a lighting device with transient current suppression function according to the first embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the lighting device with transient current suppression function according to the first embodiment of the present invention in use.

[0023] Figure 4 This is a circuit diagram of a lighting device with transient current suppression function according to a second embodiment of the present invention;

[0024] Figure 5 This is a circuit diagram of a lighting device with transient current suppression function according to a third embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1-Lighting device; 11-Rectifier circuit; 12-Transient current suppression circuit; 13-Voltage divider circuit; 14-Voltage conversion circuit; 15-Light source; CX1-First filter capacitor; CX2-Second filter capacitor; Rn-Resistor assembly; LT-Live wire terminal of rectifier circuit; NT-Neutral wire terminal of rectifier circuit; T1-First output terminal of rectifier circuit (bridge rectifier); T2-Second output terminal of rectifier circuit (bridge rectifier); I1, I2-Input terminals of bridge rectifier; N1-First node; N2-Second node Node; N3 - Third node; N4 - Fourth node; Fs - Fuse; Lf - Common mode inductor; Br - Bridge rectifier; Zd - Zener diode; Sw - Switch; C1 - First regulating capacitor; C2 - Second regulating capacitor; R1 - First resistor; R2 - Second resistor; R3 - Third resistor; R4 - Fourth resistor; R5 - Fifth resistor; Rs - Auxiliary resistor; GND - Grounding point; AS - Air switch; L - Live wire terminal of air switch; N - Neutral wire terminal of air switch; G - Grounding terminal of air switch.

[0027] The following detailed description of the features and advantages of the present invention is sufficient to enable anyone skilled in the art to understand the technical content of the present invention and implement it accordingly. Based on the content disclosed in this specification, the claims and drawings, anyone skilled in the art can easily understand the purpose and advantages of this creation. Detailed Implementation

[0028] The following description, with reference to the accompanying drawings, illustrates embodiments of a lighting device with transient current suppression functionality according to the present invention. For clarity and ease of illustration, the dimensions and proportions of the components in the drawings may be exaggerated or reduced. In the following description and / or claims, when a component is referred to as "connected" or "coupled" to another component, it may be directly connected or coupled to that other component, or an intervening component may be present; while when a component is referred to as "directly connected" or "directly coupled" to another component, no intervening component is present. Other terms used to describe the relationship between components or layers should be interpreted in the same manner. For ease of understanding, the same components in the following embodiments are indicated by the same symbols.

[0029] Please see Figure 1 This is a block diagram of the circuit structure of a lighting device with transient current suppression function according to the first embodiment of the present invention. The lighting device 1 includes a rectifier circuit 11, a first filter capacitor CX1, a resistor assembly Rn, a transient current suppression circuit 12, a voltage divider circuit 13, a voltage conversion circuit 14, and a light source 15.

[0030] The rectifier circuit 11 has a live wire terminal LT and a neutral wire terminal NT, which can be connected to an external power source (such as mains power or other AC power) through an air switch. The first output terminal T1 of the rectifier circuit 11 is connected to the first node N1, and the second output terminal T2 of the rectifier circuit 11 is connected to the third node N3.

[0031] One end of the first filter capacitor CX1 is connected to the first node N1, and the other end of the first filter capacitor CX1 is connected to the second node N2. The second node N2 is connected to the ground point GND.

[0032] One end of the resistor component Rn is connected to the second node N2, and the other end of the resistor component Rn is connected to the third node N3. In this embodiment, the resistor component Rn is a thermistor (such as a negative temperature coefficient thermistor). In another embodiment, the resistor component Rn may also be a cement resistor, a carbon film resistor, or other existing resistors.

[0033] The first terminal of the transient current suppression circuit 12 is connected to the third node N3, the second terminal of the transient current suppression circuit 12 is connected to the second node N2, and the third terminal of the transient current suppression circuit 12 is connected to the fourth node N4.

[0034] One end of the voltage divider circuit 13 is connected to the first node N1, while the other end of the voltage divider circuit 13 is connected to the fourth node N4.

[0035] One end of the voltage conversion circuit 14 is connected to the first node N1, and the other end of the voltage conversion circuit 14 is connected to the fourth node N4. In this embodiment, the voltage conversion circuit 14 can be a DC / DC converter, such as a boost converter, a buck converter, or a boost / buck converter.

[0036] The light source 15 is connected to the voltage conversion circuit 14. In this embodiment, the light source 15 can be a light-emitting diode, a light-emitting diode array, or other similar components. In another embodiment, the light source 15 can also be a fluorescent lamp, a light bulb, or other similar components. With the above circuit structure, an external power supply can drive the light source 15.

[0037] Of course, this embodiment is only for illustrative purposes and is not intended to limit the scope of the invention. Equivalent modifications or alterations made to the lighting device 1 with transient current suppression function according to this embodiment should still be included within the patent scope of the invention.

[0038] Please see Figure 2 This is a circuit diagram of a lighting device with transient current suppression function according to the first embodiment of the present invention, and please also refer to... Figure 1 .like Figure 1 As shown, the lighting device 1 includes a rectifier circuit 11, a first filter capacitor CX1, a resistor assembly Rn, a transient current suppression circuit 12, a voltage divider circuit 13, a voltage conversion circuit 14, and a light source 15. Figure 2 The circuit structure of the rectifier circuit 11, transient current suppression circuit 12 and voltage divider circuit 13 of the lighting device 1 is illustrated by example, but the circuit structure of the rectifier circuit 11, transient current suppression circuit 12 and voltage divider circuit 13 can be changed according to actual needs. Figure 2 The connection relationships of the rectifier circuit 11, the first filter capacitor CX1, the resistor assembly Rn, the transient current suppression circuit 12, and the voltage divider circuit 13 are illustrated with examples. Figure 2 As shown, the rectifier circuit 11 has a live wire terminal LT and a neutral wire 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 wire terminal LT through the fuse Fs, while the other input terminal of the common-mode inductor Lf is connected to the neutral wire terminal NT. The two output terminals of the common-mode inductor Lf are respectively connected to the two ends of the second filter capacitor CX2, and the two ends of the second filter capacitor CX2 are respectively connected to the two input terminals I1 and I2 of the bridge rectifier Br. The common-mode inductor Lf provides isolation to prevent the second filter capacitor CX2 from being charged when the lighting device 1 is connected to an external power supply (when the circuit breaker is on), which would cause the circuit breaker to trip (the circuit breaker trips when the current exceeds the rated current of the circuit breaker).

[0039] One end of the first filter capacitor CX1 is connected to the first node N1, and the other end of the first filter capacitor CX1 is connected to the second node N2. The first node N1 is connected to the first output terminal T1 of the rectifier circuit 11 (bridge rectifier Br), and the second node N2 is connected to the ground point GND.

[0040] One end of resistor Rn is connected to the second node N2, and the other end of resistor Rn is connected to the third node N3. The third node N3 is connected to the second output terminal T2 of rectifier circuit 11 (bridge rectifier Br).

[0041] The transient current suppression circuit 12 includes a switch Sw, a first regulating capacitor C1, and a Zener diode Zd. The first terminal (gate) of the switch Sw is connected to the fourth node N4, the second terminal (source) of the switch Sw is connected to the second node N2, and the third terminal (drain) of the switch Sw is connected to the third node N3. One end of the first regulating capacitor C1 is connected to the second node N2, and the other end of the first regulating capacitor C1 is connected to the third node N3. In this embodiment, the switch Sw is a MOSFET. In another embodiment, the switch Sw may be a BJT or other similar component. 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 be used to regulate the voltage applied to the first terminal (gate) of the switch Sw to prevent the voltage from becoming too high.

[0042] The voltage divider circuit 13 includes a first resistor group, a second resistor group, a second regulating capacitor C2, and a fifth resistor R5, and can be used to generate a voltage 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 vary 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 vary 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 through the fifth resistor R5 and connected to the second resistor group. The second regulating capacitor C2 is connected in parallel with the second resistor group (the fourth resistor R4).

[0043] When the lighting device 1 (rectifier circuit 11) is connected to an external power source (air switch is on), the switch Sw remains in the off state at the instant. At this time, current flows through the resistor component Rn, enabling it to limit the current supplied to other circuit components of the lighting device 1. Then, after the conduction delay time has elapsed, the transient current has been effectively suppressed. At this time, the switch Sw is turned on, causing the resistor component Rn to enter a short-circuit state, so that the current supplied to other circuit components of the lighting device 1 is not limited by the resistor component Rn. When the lighting device 1 is connected to an external power source (air switch is on), the first regulating capacitor C1 and the second regulating capacitor C2 are charged, allowing them to subsequently provide voltage to the switch Sw, thus turning on the switch Sw.

[0044] The capacitance values ​​of the first regulating capacitor C1 and the second regulating capacitor C2 are related to the turn-on delay time of the switch Sw. The capacitance value of the first regulating capacitor C1 is directly proportional to the turn-on delay time of the switch Sw, and the capacitance value of the second regulating capacitor C2 is also directly proportional to the turn-on delay time of the switch Sw. The first regulating capacitor C1 is located in the transient current suppression circuit 12, while the second regulating capacitor C2 is located in the voltage divider circuit 13. This circuit design allows for greater flexibility in the lighting device 1's circuit design, better meeting the needs of different applications. Therefore, the turn-on delay time of the switch Sw can be appropriately changed by adjusting the capacitance values ​​of the first regulating capacitor C1 and the second regulating capacitor C2, thereby more effectively providing transient current suppression. For example, the turn-on delay time of the switch Sw can be adjusted to approximately 10ms-100ms (the turn-on delay time of the switch Sw can be adjusted according to actual needs); the turn-on of the switch Sw needs to avoid the time point when the first filter capacitor CX1 generates transient current during charging. In addition, the resistance value of the fifth resistor R5 is also related to the conduction delay time of the switch Sw. The conduction delay time of the switch Sw can be changed by adjusting the resistance value of the fifth resistor R5.

[0045] The aforementioned transient current suppression circuit 12 and its operating mechanism can effectively provide transient current suppression. Therefore, the transient current of the lighting device 1 can be effectively reduced, allowing the circuit breaker to be connected in series with more lighting devices 1. Thus, the circuit breaker can achieve maximum efficiency.

[0046] Furthermore, as mentioned above, the voltage divider circuit 13 also includes a second regulating capacitor C1. The capacitance values ​​of the first regulating capacitor C1 and the second regulating capacitor C2 are related to the on-time delay of the switch. Therefore, the voltage divider circuit 12 of the lighting device 1 also has an auxiliary circuit that assists in the transient current suppression function. Thus, the on-time delay of the switch Sw can be appropriately changed by adjusting the capacitance values ​​of the first regulating capacitor C1 and the second regulating capacitor C2, thereby providing a more effective transient current suppression function. Therefore, the circuit of the lighting device 1 can achieve higher stability.

[0047] Of course, this embodiment is only for illustrative purposes and is not intended to limit the scope of the invention. Equivalent modifications or alterations made to the lighting device 1 with transient current suppression function according to this embodiment should still be included within the patent scope of the invention.

[0048] Please see Figure 3 This is a schematic diagram illustrating the usage state of a lighting device with transient current suppression function according to the first embodiment of the present invention. As shown, multiple lighting devices 1 can be connected in series and connected to an air switch AS (L represents the live wire terminal of the air switch AS; N represents the neutral wire terminal of the air switch AS; G represents the ground terminal of the air switch AS, which is connected to an external power supply). The circuit design of this embodiment can effectively reduce the transient current of each lighting device 1, allowing the air switch AS to be connected in series with more lighting devices 1. Therefore, the air switch AS can achieve maximum efficiency.

[0049] Of course, this embodiment is only for illustrative purposes and is not intended to limit the scope of the invention. Equivalent modifications or alterations made to the lighting device 1 with transient current suppression function according to this embodiment should still be included within the patent scope of the invention.

[0050] Please see Figure 4 This is a circuit diagram of a lighting device with transient current suppression function according to the second embodiment of the present invention, and please also refer to... Figure 1 .like Figure 1 As shown, the lighting device 1 includes a rectifier circuit 11, a first filter capacitor CX1, a resistor assembly Rn, a transient current suppression circuit 12, a voltage divider circuit 13, a voltage conversion circuit 14, and a light source 15. Figure 4 The circuit structure of the rectifier circuit 11, transient current suppression circuit 12 and voltage divider circuit 13 of the lighting device 1 is illustrated by example, but the circuit structure of the rectifier circuit 11, transient current suppression circuit 12 and voltage divider circuit 13 can be changed according to actual needs. Figure 4 The connection relationships of the rectifier circuit 11, the first filter capacitor CX1, the resistor assembly Rn, the transient current suppression circuit 12, and the voltage divider circuit 13 are illustrated with examples.

[0051] The components described above are similar to those in the previous embodiments, and therefore will not be repeated here. Unlike the previous embodiments, the lighting device 1 in this embodiment further includes an auxiliary resistor Rs. One end of the resistor component Rn is connected to the second node N2 via the auxiliary resistor Rs, while the other end of the resistor component Rn is connected to the third node N3.

[0052] As described above, the lighting device 1 also includes an auxiliary resistor Rs, with one end of the resistor component Rn connected to the second node N2 via the auxiliary resistor Rs. The auxiliary resistor Rs effectively reduces the influence of ambient temperature on the resistor component Rn, making its resistance value less susceptible to changes due to environmental factors. This circuit design further enhances the transient current suppression function. Therefore, the lighting device 1 is more flexible in its use and better meets the needs of practical applications.

[0053] Similarly, the transient current suppression circuit 12 and its operating mechanism described above can effectively provide transient current suppression. Therefore, the transient current of the lighting device 1 can be effectively reduced, allowing the circuit breaker to be connected in series with more lighting devices 1. Thus, the circuit breaker can achieve maximum efficiency.

[0054] Of course, this embodiment is only for illustrative purposes and is not intended to limit the scope of the invention. Equivalent modifications or alterations made to the lighting device 1 with transient current suppression function according to this embodiment should still be included within the patent scope of the invention.

[0055] It is worth mentioning that, because the transient current of existing lighting devices cannot be effectively reduced, the air switch cannot achieve its maximum efficiency. Conversely, according to the first and second embodiments of the present invention, the lighting device includes a rectifier circuit, a first filter capacitor, a resistor assembly, a transient current suppression circuit, and a voltage divider circuit. The rectifier circuit is connected to the live wire output terminal and the neutral wire 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 the first output terminal of the rectifier circuit, and the second node is connected to a ground point. One end of the resistor assembly is connected to the second node, and the other end of the resistor assembly is connected to a third node. The third node is connected to the second output terminal of the rectifier circuit. The transient current suppression circuit includes a switch and a first regulating capacitor. The first end of the switch is connected to a fourth node, the second end of the switch is connected to the second node, and the third end of the switch is connected to the third node. One end of the first regulating capacitor is connected to the second node, and the other end of the first regulating 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 aforementioned transient current suppression circuit can momentarily keep the switch off when the lighting device is connected to an external power source (when the circuit breaker is on), allowing the resistor component to limit the current supplied to other circuit components of the lighting device. In this way, the transient current suppression circuit effectively achieves its function of suppressing transient current. Then, once the transient current is effectively suppressed, the transient current suppression circuit can control the switch to return to the on state, causing the resistor component to enter a short-circuit state, so that the current supplied to other circuit components of the lighting device is not limited by the resistor component. Therefore, the transient current of the lighting device can be effectively reduced, allowing the circuit breaker to be connected in series with more lighting devices. Thus, the circuit breaker can achieve maximum efficiency.

[0056] Furthermore, according to the first and second embodiments of the present invention, the voltage divider circuit of the lighting device further includes a second regulating capacitor, the capacitance values ​​of which 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 in transient current suppression. Thus, the on-delay time of the switch can be appropriately changed by adjusting the capacitance values ​​of the first and second regulating capacitors, thereby providing transient current suppression more effectively. Therefore, the circuit of the lighting device can achieve higher stability.

[0057] Furthermore, according to the first and second embodiments of the present invention, the lighting device further includes an auxiliary resistor, one end of which is connected to the second node. This auxiliary resistor effectively reduces the influence of ambient temperature on the resistor component, making its resistance value less susceptible to changes due to environmental factors. The circuit design further enhances transient current suppression. Therefore, the lighting device is more flexible in its use and better meets the needs of practical applications.

[0058] Furthermore, according to the first and second embodiments of the present invention, the lighting device can provide effective transient current suppression and achieve higher stability, enabling it to be applied in various locations such as factories, mines, and retail stores. Therefore, the lighting device has a wider range of applications and can meet the needs of different applications.

[0059] Furthermore, according to the first and second embodiments of the present invention, the circuit design of the lighting device is simple, thus achieving the desired effect without significantly increasing costs. Therefore, the overall cost of the lighting device can be reduced, enabling it to achieve greater practicality. As can be seen from the above, the lighting device with transient current suppression function according to the embodiments of the present invention can indeed achieve excellent technical results.

[0060] Please see Figure 5 This is a circuit diagram of a lighting device with transient current suppression function according to the second embodiment of the present invention, and please also refer to... Figure 1 .like Figure 1 As shown, the lighting device 1 includes a rectifier circuit 11, a first filter capacitor CX1, a resistor assembly Rn, a transient current suppression circuit 12, a voltage divider circuit 13, a voltage conversion circuit 14, and a light source 15. Figure 5 The circuit structure of the rectifier circuit 11, transient current suppression circuit 12 and voltage divider circuit 13 of the lighting device 1 is illustrated by example, but the circuit structure of the rectifier circuit 11, transient current suppression circuit 12 and voltage divider circuit 13 can be changed according to actual needs. Figure 5 The connection relationships of the rectifier circuit 11, the first filter capacitor CX1, the resistor assembly Rn, the transient current suppression circuit 12, and the voltage divider circuit 13 are illustrated with examples.

[0061] The components described above are similar to those in the previous embodiments, and therefore will not be repeated here. Unlike the previous embodiments, 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. Additionally, the resistor component Rn is positioned between the other input terminal of the common-mode inductor Lf and the neutral terminal NT. This circuit design achieves the same effects as the first and second embodiments.

[0062] Of course, this embodiment is only for illustrative purposes and is not intended to limit the scope of the invention. Equivalent modifications or alterations made to the lighting device 1 with transient current suppression function according to this embodiment should still be included within the patent scope of the invention.

[0063] In summary, according to the first, second, and third embodiments of the present invention, the lighting device includes a rectifier circuit, a first filter capacitor, a resistor assembly, a transient current suppression circuit, and a voltage divider circuit. The rectifier circuit is connected to the live wire output terminal and the neutral wire 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 the first output terminal of the rectifier circuit, and the second node is connected to a ground point. One end of the resistor assembly is connected to the second node, and the other end of the resistor assembly is connected to a third node. The third node is connected to the second output terminal of the rectifier circuit. The transient current suppression circuit includes a switch and a first regulating capacitor. The first end of the switch is connected to a fourth node, the second end of the switch is connected to the second node, and the third end of the switch is connected to the third node. One end of the first regulating capacitor is connected to the second node, and the other end of the first regulating 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 aforementioned transient current suppression circuit can momentarily keep the switch off when the lighting device is connected to an external power source (when the circuit breaker is on), allowing the resistor component to limit the current supplied to other circuit components of the lighting device. In this way, the transient current suppression circuit effectively achieves its function of suppressing transient current. Then, once the transient current is effectively suppressed, the transient current suppression circuit can control the switch to return to the on state, causing the resistor component to enter a short-circuit state, so that the current supplied to other circuit components of the lighting device is not limited by the resistor component. Therefore, the transient current of the lighting device can be effectively reduced, allowing the circuit breaker to be connected in series with more lighting devices. Thus, the circuit breaker can achieve maximum efficiency.

[0064] Furthermore, according to the first, second, and third embodiments of the present invention, the voltage divider circuit of the lighting device further includes a second regulating capacitor, the capacitance values ​​of which 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 in transient current suppression. Thus, the on-delay time of the switch can be appropriately changed by adjusting the capacitance values ​​of the first and second regulating capacitors, thereby providing transient current suppression more effectively. Therefore, the circuit of the lighting device can achieve higher stability.

[0065] Furthermore, according to the first, second, and third embodiments of the present invention, the lighting device further includes an auxiliary resistor, one end of which is connected to the second node. This auxiliary resistor effectively reduces the influence of ambient temperature on the resistor component, making its resistance value less susceptible to changes due to environmental factors. The circuit design further enhances transient current suppression. Therefore, the lighting device is more flexible in its use and better meets the needs of practical applications.

[0066] Furthermore, according to the first, second, and third embodiments of the present invention, the lighting device can provide effective transient current suppression and achieve higher stability, enabling it to be applied in various locations such as factories, mines, and retail stores. Therefore, the lighting device has a wider range of applications and can meet the needs of different applications.

[0067] Furthermore, according to the first, second, and third embodiments of the present invention, the circuit design of the lighting device is simple, thus achieving the desired effect without significantly increasing costs. Therefore, the overall cost of the lighting device can be reduced, enabling it to achieve greater practicality.

[0068] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection for this invention. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of this invention, or equivalent structural or procedural transformations made using the description and drawings of this invention, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of protection of this invention.

Claims

1. A lighting device with transient current suppression function, characterized in that, include: Rectifier circuit; A first filter capacitor, one end of which is connected to a first node, the first node being connected to the first output terminal of the rectifier circuit, and the other end of which is connected to a second node, the second node being connected to a ground point; A resistor assembly, one end of which is connected to the second node, and the other end of which is connected to a third node, the third node being connected to the second output terminal of the rectifier circuit; A transient current suppression circuit includes a switch and a first regulating capacitor. The first end of the switch is connected to a fourth node, the second end of the switch is connected to a second node, the third end of the switch is connected to a third node, one end of the first regulating capacitor is connected to the second node, and the other end of the first regulating capacitor is connected to the third node. as well as A voltage divider circuit is provided, wherein 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 voltage divider circuit includes a first resistor group, a second resistor group, a second regulating capacitor, and a fifth resistor. One end of the first resistor group is connected to the first node, and the other end of the first resistor group is connected to the fourth node and connected to the second resistor group. The second regulating capacitor is connected in parallel with the second resistor group, and the other end of the first resistor group is connected to the fourth node through the fifth resistor.

2. The lighting device with transient current suppression function as described in claim 1, characterized in that, The capacitance value of the first regulating capacitor is related to the conduction delay time of the switch.

3. The lighting device with transient current suppression function as described in claim 1, characterized in that, The switch enters the on state the instant the rectifier circuit is connected to the external power supply to suppress transient current, and returns to the off state after the transient current is suppressed.

4. The lighting device with transient current suppression function as described in claim 1, characterized in that, The transient current suppression circuit also includes a Zener diode, one end of which is connected to the second node and the other end of which is connected to the fourth node.

5. The lighting device with transient current suppression function as described in claim 1, characterized in that, It also includes an auxiliary resistor, one end of which is connected to the second node.

6. The lighting device with transient current suppression function as described in claim 1, characterized in that, The capacitance value of the second regulating capacitor is related to the conduction delay time of the switch.

7. The lighting device with transient current suppression function as described in claim 1, characterized in that, The switch is a metal-oxide-semiconductor field-effect transistor or a triode.

8. The lighting device with transient current suppression function as described in claim 1, characterized in that, The resistor assembly is a thermistor, a cement resistor, or a carbon film resistor.

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