Circuit for solving impulse current of switching device

Abstract

The utility model discloses a circuit for solving the impulse current of a switching device, which belongs to the technical field of avoiding the impulse current of the switching device, and comprises a rectifying circuit, the rectifying circuit comprises a bridge rectifier DB1, a pin 1 of the bridge rectifier DB1 is connected with one end of a fuse F1, the other end of the fuse F1 is connected with a live wire L, a pin 3 of the bridge rectifier DB1 is connected with a null line N, and the null line N is connected with the other end of the fuse F1. The second pin of the bridge rectifier DB1 is connected with a first booster circuit, the first booster circuit comprises a chip U1, the fifth pin of the chip U1 is connected with the positive electrode end of a diode ZD4, the negative electrode end of the diode ZD4 is connected with an electrolytic capacitor CE1 and a step-down circuit, and the negative electrode end of the electrolytic capacitor CE1 is connected with the fourth pin of the bridge rectifier DB1. According to the utility model, the negative electrode end of the electrolytic capacitor CE1 in the first booster circuit is connected with the pin 4 of the bridge rectifier DB1 and is not directly connected with the control circuit, so that the control circuit can be prevented from being damaged by impact current generated at the moment of power-on.

Description

Technical Field

[0001] The utility model belongs to the technical field of switching device impact current, and in particular relates to a circuit for solving the impact current of switching devices. Background Art

[0002] As competition in electronic products becomes increasingly fierce, in order to ensure the safety and stability of products during use, many manufacturers use various circuit solutions to solve the impact current in the driving power supply of various electronic products to ensure that the product will not fail due to the impact current during use.

[0003] However, most of the existing circuit solutions for solving the impact current have complex circuit structure and inconvenient layout, resulting in high circuit design cost. Therefore, there is an urgent need for a circuit to solve the impact current of switching devices, which has the characteristics of simple circuit structure, convenient layout, no impact on the original circuit and low circuit cost. Utility Model Content

[0004] In order to solve the problems raised in the above background technology, the utility model provides a circuit for solving the impact current of switch devices, which has the characteristics of simple circuit structure, convenient layout, no influence on the original circuit and low circuit cost.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a circuit for solving the impact current of switching devices, including a rectifier circuit, the input end of the rectifier circuit is connected to the mains, the output end of the rectifier circuit is connected to the first boost circuit, the first boost circuit is respectively connected to the first light source LED1 and the buck circuit, the first light source LED1 and the buck circuit are respectively connected to the control circuit, wherein the rectifier circuit includes a rectifier bridge stack DB1, pin 1 of the rectifier bridge stack DB1 is connected to one end of the fuse F1, the other end of the fuse F1 is connected to the live wire L, pin 3 of the rectifier bridge stack DB1 is connected to the neutral wire N, pin 2 of the rectifier bridge stack DB1 is connected to the first boost circuit, the first boost circuit includes a chip U1, pin 5 of the chip U1 is connected to the positive terminal of the diode ZD4, the negative terminal of the diode ZD4 is respectively connected to the electrolytic capacitor CE1 and the buck circuit, and the negative terminal of the electrolytic capacitor CE1 is connected to the 4th pin of the rectifier bridge stack DB1.

[0006] In order to meet the power supply demand of the first light source LED1 and reduce costs, further, pin 6 of chip U1 is respectively connected to one end of inductor T3-T4, diode D1, diode D2 and resistor R3, the other end of inductor T3-T4 is respectively connected to diode D5 and pin 2 of rectifier bridge stack DB1, the other end of resistor R3 is connected to one end of capacitor C1, capacitor C1, diode D1, diode D2 and the other end of diode D5 are respectively connected to the negative terminal of diode ZD4, pin 3 of chip U1 is respectively connected to one end of resistor RS1, resistor RS2 and capacitor C3, pin 2 of chip U1 is respectively connected to one end of resistor R5, resistor R6 and the negative terminal of diode ZD2, the other end of resistor R6 is connected to one end of resistor R7, the other end of resistor R7 is connected to the negative terminal of diode ZD4, resistor RS1, resistor RS2, capacitor C3, the other end of resistor R5 and the positive terminal of diode ZD2 are respectively connected to pin 4 of rectifier bridge stack DB1.

[0007] Furthermore, the first light source LED1 is connected in parallel to ends of the resistor R7 and the resistor R5.

[0008] In order to power the control circuit, further, the step-down circuit includes a chip U4, wherein pin 4 of the chip U4 is respectively connected to the negative terminal of the diode D7 and one end of the capacitor C5, the positive terminal of the diode D7 is respectively connected to one end of the resistor VR2 and the first boost circuit, pin 5 of the chip U4 is connected to one end of the resistor R14, pin 3 of the chip U4 is connected to the negative terminal of the diode D88, the positive terminal of the diode D88 is connected to the control circuit, pins 1 and 2 of the chip U4 are respectively connected to the other end of the resistor R14, the negative terminal of the diode D9 and one end of the inductor T5, the other end of the inductor T5 is respectively connected to the positive terminal of the diode D88 and one end of the capacitor CE3, the resistor VR2, the capacitor C5, the other end of the capacitor CE3 and the positive terminal of the diode D9 are respectively connected to pin 4 of the rectifier bridge stack DB1, the capacitor C6 is connected in parallel to pins 1 and 3 of the chip U4, and the resistor R13 is connected in parallel to the positive terminal of the diode D88 and the negative terminal of the capacitor CE3.

[0009] In order to control the light source, further, the control circuit includes an operational amplifier U3, wherein pin 1 of the operational amplifier U3 is respectively connected to one end of the resistor R19, the capacitor C8, the resistor R17 and the resistor R18, the other end of the resistor R18 is connected to the step-down circuit, pin 3 of the operational amplifier U3 is respectively connected to one end of the capacitor C7, the resistor R16 and the collector of the phototransistor Q3, the emitter of the phototransistor Q3 is connected to one end of the resistor R23, pin 4 of the operational amplifier U3 is respectively connected to the other end of the resistor R19 and the resistor R12, one end of the capacitor C10, pin 5 of the operational amplifier U3 is respectively connected to one end of the capacitor C9 and the capacitor C11, the other end of the resistor R16 is connected to the collector of the phototransistor Q3, the emitter of the phototransistor Q3 is connected to one end of the resistor R23, pin 4 of the operational amplifier U3 is respectively connected to the other end of the resistor R19 and the resistor R12, one end of the capacitor C10, pin 5 of the operational amplifier U3 is connected to one end of the capacitor C9 and the capacitor C11, the other end of the resistor R16 is connected to the collector of the phototransistor Q3, the emitter of the phototransistor Q3 is connected to one end of the resistor R2 ... One end is respectively connected to the other end of the resistor R18 and one end of the resistor R22, the other end of the resistor R22 is respectively connected to the collector of the MOS tube Q1, the capacitor C13 and one end of the resistor R15, the other end of the resistor R15 is connected to the base of the MOS tube Q2, the capacitor C12 is connected in parallel between the emitter and the collector of the MOS tube Q2, the collector of the MOS tube Q2 is also connected to the negative end of the first light source LED1, and the emitters of the MOS tubes Q1 and Q2, the capacitor C13, the capacitor C10, the capacitor C7, the resistor R23, the capacitor C8 and the other ends of the resistor R17 are respectively connected to the 4 pins of the rectifier bridge stack DB1.

[0010] In order to filter out the clutter, a filter circuit is further included. The filter circuit includes a capacitor CB1. The capacitor CB1 is connected in parallel between the 2nd and 4th pins of the rectifier bridge DB1.

[0011] In order to achieve the surge protection function, it further includes a fuse resistor RF1 and a fuse resistor RF2 connected in parallel, a fuse resistor RF3 and a fuse resistor RF4 connected in parallel, and a resistor VR1, wherein the fuse resistor RF1 and the fuse resistor RF2 connected in parallel are connected in series to pin 1 of the rectifier bridge stack DB1, the fuse resistor RF3 and the fuse resistor RF4 connected in parallel are connected to pin 3 of the rectifier bridge stack DB1, and the resistor VR1 is connected in parallel between the live wire L and the neutral wire N.

[0012] In order to meet the demand of a light source with a rated power of 100W, it further includes a second boost circuit and a second light source. The structure of the second boost circuit is the same as that of the first boost circuit. The second boost circuit is connected to the rectifier circuit and the second light source, and the second light source is connected to the control circuit.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The negative terminal of the electrolytic capacitor CE1 in the first boost circuit of the utility model is connected to the 4th pin of the rectifier bridge DB1, and is not directly connected to the control circuit, so as to avoid the impact current generated at the moment of power-on from damaging the control circuit;

[0015] 2. The utility model uses the first boost circuit to increase the voltage to more than 400 volts to supply power to the first light source LED1, thereby meeting the power supply demand of the first light source LED1 and reducing costs;

[0016] 3. The utility model also includes a filter circuit, which includes a capacitor CB1. The capacitor CB1 is connected in parallel between pins 2 and 4 of the rectifier bridge DB1, and the clutter is filtered out by the capacitor CB1;

[0017] 4. The utility model also includes a fuse resistor RF1 and a fuse resistor RF2 connected in parallel, a fuse resistor RF3 and a fuse resistor RF4 connected in parallel, and a resistor VR1, wherein the fuse resistor RF1 and the fuse resistor RF2 connected in parallel are connected in series to pin 1 of the rectifier bridge DB1, the fuse resistor RF3 and the fuse resistor RF4 connected in parallel are connected to pin 3 of the rectifier bridge DB1, and the resistor VR1 is connected in parallel between the live wire L and the neutral wire N to achieve a surge protection function;

[0018] 5. For a light source with a rated power of 100W, the utility model further includes a second boost circuit and a second light source. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a circuit connection block diagram of the utility model;

[0021] Figure 2 The circuit diagram of the rectifier circuit of the utility model;

[0022] Figure 3 The circuit diagram of the filter circuit of the utility model;

[0023] Figure 4 It is a circuit diagram of the first boost circuit of the utility model;

[0024] Figure 5 The circuit diagram of the step-down circuit of the utility model;

[0025] Figure 6 It is a circuit diagram of the control circuit of the utility model;

[0026] In the figure: 1. Rectification circuit; 2. Filter circuit; 3. First boost circuit; 4. First light source; 5. Control circuit; 6. Buck circuit. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Example 1

[0029] See also Figure 1-6 The utility model provides the following technical solutions: a circuit for solving the impact current of a switching device, comprising a rectifier circuit 1, wherein the input end of the rectifier circuit 1 is connected to the mains, the output end of the rectifier circuit 1 is connected to the first boost circuit 3, the first boost circuit 3 is respectively connected to the first light source LED1 and the buck circuit 6, the first light source LED1 and the buck circuit 6 are respectively connected to the control circuit 5, wherein the rectifier circuit 1 comprises a rectifier bridge DB1, pin 1 of the rectifier bridge DB1 is connected to one end of the fuse F1, the other end of the fuse F1 is connected to the live wire L, pin 3 of the rectifier bridge DB1 is connected to the neutral wire N, pin 2 of the rectifier bridge DB1 is connected to the first boost circuit 3, the first boost circuit 3 comprises a chip U1, the model of the chip U1 is jw19659, pin 5 of the chip U1 is connected to the positive terminal of the diode ZD4, the negative terminal of the diode ZD4 is respectively connected to the electrolytic capacitor CE1 and the buck circuit 6, and the negative terminal of the electrolytic capacitor CE1 is connected to pin 4 of the rectifier bridge DB1.

[0030] By adopting the above technical solution, the negative terminal of the electrolytic capacitor CE1 in the first boost circuit 3 of the utility model is connected to the 4th pin of the rectifier bridge DB1, and is not directly connected to the control circuit, thereby avoiding the impact current generated at the moment of power-on to damage the control circuit.

[0031] Specifically, pin 6 of chip U1 is respectively connected to one end of inductor T3-T4, diode D1, diode D2 and resistor R3, the other end of inductor T3-T4 is respectively connected to diode D5 and pin 2 of rectifier bridge stack DB1, the other end of resistor R3 is connected to one end of capacitor C1, capacitor C1, diode D1, diode D2 and the other end of diode D5 are respectively connected to the negative terminal of diode ZD4, pin 3 of chip U1 is respectively connected to one end of resistor RS1, resistor RS2 and capacitor C3, pin 2 of chip U1 is respectively connected to one end of resistor R5, resistor R6 and the negative terminal of diode ZD2, the other end of resistor R6 is connected to one end of resistor R7, the other end of resistor R7 is connected to the negative terminal of diode ZD4, resistor RS1, resistor RS2, capacitor C3, the other end of resistor R5 and the positive terminal of diode ZD2 are respectively connected to pin 4 of rectifier bridge stack DB1.

[0032] By adopting the above technical solution, the voltage is increased to more than 400 volts through the first boost circuit to power the first light source LED1, thereby meeting the power supply demand of the first light source LED1 and reducing costs.

[0033] Specifically, the first light source LED1 is connected in parallel to the ends of the resistor R7 and the resistor R5.

[0034] Specifically, the step-down circuit 6 includes a chip U4, which is a BP2525AHL type. Pin 4 of the chip U4 is respectively connected to the negative terminal of the diode D7 and one end of the capacitor C5, the positive terminal of the diode D7 is respectively connected to one end of the resistor VR2 and the first boost circuit 3, the pin 5 of the chip U4 is connected to one end of the resistor R14, the pin 3 of the chip U4 is connected to the negative terminal of the diode D88, the positive terminal of the diode D88 is connected to the control circuit 5, the pins 1 and 2 of the chip U4 are respectively connected to the other end of the resistor R14, the negative terminal of the diode D9 and one end of the inductor T5, the other end of the inductor T5 is respectively connected to the positive terminal of the diode D88 and one end of the capacitor CE3, the resistor VR2, the capacitor C5, the other end of the capacitor CE3 and the positive terminal of the diode D9 are respectively connected to the pin 4 of the rectifier bridge stack DB1, the capacitor C6 is connected in parallel to the pins 1 and 3 of the chip U4, and the resistor R13 is connected in parallel to the positive terminal of the diode D88 and the negative terminal of the capacitor CE3.

[0035] By adopting the above technical solution, the voltage is reduced to about ten volts to power the control circuit.

[0036] Specifically, the control circuit 5 includes an operational amplifier U3, which is a LM321A-5PIN type. Pin 1 of the operational amplifier U3 is respectively connected to the resistor R19, the capacitor C8, the resistor R17 and one end of the resistor R18, the other end of the resistor R18 is connected to the step-down circuit 6, the pin 3 of the operational amplifier U3 is respectively connected to the capacitor C7, one end of the resistor R16 and the collector of the phototransistor Q3, the emitter of the phototransistor Q3 is connected to one end of the resistor R23, the pin 4 of the operational amplifier U3 is respectively connected to the other end of the resistor R19 and one end of the resistor R12 and the capacitor C10, the pin 5 of the operational amplifier U3 is connected to the capacitor C9 and one end of the capacitor C11, the resistor The other end of R16 is respectively connected to the other end of resistor R18 and one end of resistor R22, the other end of resistor R22 is respectively connected to the collector of MOS tube Q1, capacitor C13 and one end of resistor R15, the other end of resistor R15 is connected to the base of MOS tube Q2, capacitor C12 is connected in parallel between the emitter and collector of MOS tube Q2, the collector of MOS tube Q2 is also connected to the negative terminal of the first light source LED1, the emitters of MOS tube Q1 and MOS tube Q2, capacitor C13, capacitor C10, capacitor C7, resistor R23, capacitor C8 and the other end of resistor R17 are respectively connected to pin 4 of rectifier bridge stack DB1.

[0037] By adopting the above technical solution, the light source is controlled.

[0038] Example 2

[0039] The present embodiment is different from the embodiment 1 in that: specifically, it further includes a filter circuit 2, the filter circuit 2 includes a capacitor CB1, and the capacitor CB1 is connected in parallel between the 2nd and 4th pins of the rectifier bridge DB1.

[0040] By adopting the above technical solution, the clutter is filtered out through the capacitor CB1.

[0041] Example 3

[0042] This embodiment is different from Embodiment 1 in that: specifically, it also includes a fuse resistor RF1 and a fuse resistor RF2 connected in parallel, a fuse resistor RF3 and a fuse resistor RF4 connected in parallel, and a resistor VR1, wherein the fuse resistor RF1 and the fuse resistor RF2 connected in parallel are connected in series to pin 1 of the rectifier bridge stack DB1, the fuse resistor RF3 and the fuse resistor RF4 connected in parallel are connected to pin 3 of the rectifier bridge stack DB1, and the resistor VR1 is connected in parallel between the live wire L and the neutral wire N.

[0043] By adopting the above technical solution, the surge protection function is achieved.

[0044] Example 4

[0045] This embodiment is different from Embodiment 1 in that: specifically, it further includes a second boost circuit and a second light source, the structure of the second boost circuit is the same as that of the first boost circuit 3, the second boost circuit is respectively connected to the rectifier circuit 1 and the second light source, and the second light source is connected to the control circuit 5.

[0046] By adopting the above technical solution, since the single-channel first boost circuit can only supply a light source with a rated power of 50W, a light source with a rated power of 100W needs to be used in conjunction with a second boost circuit, and so on. For light sources with higher rated powers, it is necessary to continue to add boost circuits.

[0047] In summary, the negative terminal of the electrolytic capacitor CE1 in the first boost circuit 3 of the utility model is connected to the 4th pin of the rectifier bridge DB1, and is not directly connected to the control circuit, so as to avoid the impact current generated at the moment of power-on from damaging the control circuit; the utility model uses the first boost circuit to increase the voltage to more than 400 volts to power the first light source LED1, thereby meeting the power supply demand of the first light source LED1 and reducing costs; the utility model also includes a filter circuit 2, and the filter circuit 2 includes a capacitor CB1, which is connected in parallel between the 2nd and 4th pins of the rectifier bridge DB1, and the clutter is filtered out by the capacitor CB1. Filtering; The utility model also includes a fuse resistor RF1 and a fuse resistor RF2 connected in parallel, a fuse resistor RF3 and a fuse resistor RF4 connected in parallel, and a resistor VR1, wherein the fuse resistor RF1 and the fuse resistor RF2 connected in parallel are connected in series to pin 1 of the rectifier bridge stack DB1, the fuse resistor RF3 and the fuse resistor RF4 connected in parallel are connected to pin 3 of the rectifier bridge stack DB1, and the resistor VR1 is connected in parallel between the live wire L and the neutral wire N to achieve a surge protection function; for a light source with a rated power of 100W, the utility model also includes a second boost circuit and a second light source.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A circuit for solving the impact current of a switching device, comprising a rectifier circuit, characterized in that: The input end of the rectifier circuit is connected to the mains, the output end of the rectifier circuit is connected to the first boost circuit, the first boost circuit is respectively connected to the first light source LED1 and the buck circuit, the first light source LED1 and the buck circuit are respectively connected to the control circuit, wherein the rectifier circuit includes a rectifier bridge stack DB1, pin 1 of the rectifier bridge stack DB1 is connected to one end of the fuse F1, the other end of the fuse F1 is connected to the live wire L, pin 3 of the rectifier bridge stack DB1 is connected to the neutral wire N, pin 2 of the rectifier bridge stack DB1 is connected to the first boost circuit, the first boost circuit includes a chip U1, pin 5 of the chip U1 is connected to the positive terminal of the diode ZD4, the negative terminal of the diode ZD4 is respectively connected to the electrolytic capacitor CE1 and the buck circuit, and the negative terminal of the electrolytic capacitor CE1 is connected to pin 4 of the rectifier bridge stack DB1.

2. A circuit for solving the inrush current of a switching device according to claim 1, characterized in that: The first light source LED1 is connected in parallel to ends of the resistor R7 and the resistor R5.

3. A circuit for solving the inrush current of a switching device according to claim 1, characterized in that: Pin 6 of the chip U1 is respectively connected to one end of the inductor T3-T4, the diode D1, the diode D2 and the resistor R3, the other end of the inductor T3-T4 is respectively connected to the diode D5 and the pin 2 of the rectifier bridge stack DB1, the other end of the resistor R3 is connected to one end of the capacitor C1, the other end of the capacitor C1, the diode D1, the diode D2 and the diode D5 are respectively connected to the negative terminal of the diode ZD4, the pin 3 of the chip U1 is respectively connected to one end of the resistor RS1, the resistor RS2 and the capacitor C3, the pin 2 of the chip U1 is respectively connected to one end of the resistor R5, the resistor R6 and the negative terminal of the diode ZD2, the other end of the resistor R6 is connected to one end of the resistor R7, the other end of the resistor R7 is connected to the negative terminal of the diode ZD4, the resistor RS1, the resistor RS2, the capacitor C3, the other end of the resistor R5 and the positive terminal of the diode ZD2 are respectively connected to pin 4 of the rectifier bridge stack DB1.

4. A circuit for solving the inrush current of a switching device according to claim 1, characterized in that: The step-down circuit includes a chip U4, wherein pin 4 of the chip U4 is respectively connected to the negative terminal of the diode D7 and one end of the capacitor C5, the positive terminal of the diode D7 is respectively connected to one end of the resistor VR2 and the first boost circuit, pin 5 of the chip U4 is connected to one end of the resistor R14, pin 3 of the chip U4 is connected to the negative terminal of the diode D88, the positive terminal of the diode D88 is connected to the control circuit, pins 1 and 2 of the chip U4 are respectively connected to the other end of the resistor R14, the negative terminal of the diode D9 and one end of the inductor T5, the other end of the inductor T5 is respectively connected to the positive terminal of the diode D88 and one end of the capacitor CE3, the resistor VR2, the capacitor C5, the other end of the capacitor CE3 and the positive terminal of the diode D9 are respectively connected to pin 4 of the rectifier bridge DB1, the capacitor C6 is connected in parallel to the pins 1 and 3 of the chip U4, and the resistor R13 is connected in parallel to the positive terminal of the diode D88 and the negative terminal of the capacitor CE3.

5. The circuit for solving the inrush current of a switching device according to claim 1, characterized in that: The control circuit includes an operational amplifier U3, wherein pin 1 of the operational amplifier U3 is respectively connected to one end of a resistor R19, a capacitor C8, a resistor R17 and a resistor R18, the other end of the resistor R18 is connected to the step-down circuit, pin 3 of the operational amplifier U3 is respectively connected to one end of a capacitor C7, a resistor R16 and a collector of a phototransistor Q3, the emitter of the phototransistor Q3 is connected to one end of a resistor R23, pin 4 of the operational amplifier U3 is respectively connected to the other end of the resistor R19 and one end of a resistor R12 and a capacitor C10, pin 5 of the operational amplifier U3 is respectively connected to one end of a capacitor C9 and a capacitor C11, the other end of the resistor R16 is respectively connected to the collector of the phototransistor Q3, the emitter of the phototransistor Q3 is connected to one end of a resistor R23, The other end of the resistor R18 is connected to one end of the resistor R22, the other end of the resistor R22 is respectively connected to the collector of the MOS tube Q1, the capacitor C13 and one end of the resistor R15, the other end of the resistor R15 is connected to the base of the MOS tube Q2, the capacitor C12 is connected in parallel between the emitter and the collector of the MOS tube Q2, the collector of the MOS tube Q2 is also connected to the negative end of the first light source LED1, the emitters of the MOS tubes Q1 and Q2, the capacitor C13, the capacitor C10, the capacitor C7, the resistor R23, the capacitor C8 and the other ends of the resistor R17 are respectively connected to the 4 pins of the rectifier bridge stack DB1.

6. A circuit for solving the inrush current of a switching device according to claim 1, characterized in that: The device also includes a filter circuit, which includes a capacitor CB1. The capacitor CB1 is connected in parallel between the 2nd and 4th pins of the rectifier bridge stack DB1.

7. A circuit for solving the inrush current of a switching device according to claim 1, characterized in that: It also includes fuse resistors RF1 and RF2 connected in parallel, fuse resistors RF3 and RF4 connected in parallel, and resistor VR1, wherein the fuse resistors RF1 and RF2 connected in parallel are connected in series to pin 1 of the rectifier bridge stack DB1, the fuse resistors RF3 and RF4 connected in parallel are connected to pin 3 of the rectifier bridge stack DB1, and the resistor VR1 is connected in parallel between the live wire L and the neutral wire N.

8. The circuit for solving the inrush current of a switching device according to claim 1, characterized in that: It also includes a second boost circuit and a second light source. The structure of the second boost circuit is the same as that of the first boost circuit. The second boost circuit is connected to the rectifier circuit and the second light source, and the second light source is connected to the control circuit.

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