Switching circuit

Abstract

The utility model discloses a switching circuit, and relates to the technical field of circuits. According to the main technical scheme, the circuit comprises a first filtering module, a control module and a second filtering module, wherein the input end of the first filtering module is used for being connected with an input power supply; the control module comprises an MOS tube Q1, and a first pin of the MOS tube Q1, a second pin of the MOS tube Q1, a third pin of the MOS tube Q1 and a fourth pin of the MOS tube Q1 are all connected with the output end of the first filtering module. The input end of the second filtering module is connected with the fifth pin of the MOS tube Q1, the sixth pin of the MOS tube Q1, the seventh pin of the MOS tube Q1 and the eighth pin of the MOS tube Q1. The purpose of controlling a large-current circuit by using the switching circuit which only passes through relatively small current is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a switch circuit. Background Art

[0002] In modern industrial production, many devices have rated operating currents of hundreds or even thousands of amperes. Allowing such high currents to flow directly through switches would inevitably impose stringent performance requirements on the switch's components, significantly increasing the switch's manufacturing cost. Furthermore, high currents flowing directly through switch circuits increase line losses, resulting in significant energy waste over time. Therefore, how to control high-current circuits using switches that only carry relatively low currents has become a pressing issue. Utility Model Content

[0003] The purpose of the utility model is to provide a switch circuit, which can achieve the purpose of controlling a large current circuit by using a switch circuit that only passes a relatively small current.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A switching circuit includes a first filter module, a control module, and a second filter module. The input end of the first filter module is used to connect to an input power supply. The control module includes a MOS transistor Q1. Pins 1, 2, 3, and 4 of the MOS transistor Q1 are all connected to the output end of the first filter module. The input end of the second filter module is connected to pins 5, 6, 7, and 8 of the MOS transistor Q1.

[0006] A further solution is: the first filtering module includes a capacitor C1 and an electrolytic capacitor C3; one end of the capacitor C1 and the positive electrode of the electrolytic capacitor C3 are used to connect to the input power supply; the other end of the capacitor C1 and the negative electrode of the electrolytic capacitor C3 are grounded; the positive electrode of the electrolytic capacitor C3 is connected to pin 1 of the MOS tube Q1, pin 2 of the MOS tube Q1, pin 3 of the MOS tube Q1, and pin 4 of the MOS tube Q1.

[0007] A further solution is: the control module further includes a switch SW1, a resistor R5 and a Zener diode ZD1; pin 2 of the switch SW1 and the cathode of the Zener diode ZD1 are both connected to the positive electrode of the electrolytic capacitor C3; pin 4 of the switch SW1 is connected to one end of the resistor R5; the other end of the resistor R5 is grounded; pin 5 of the switch SW1 is connected to the positive electrode of the Zener diode ZD1 and pin 4 of the MOS tube Q1.

[0008] A further solution is: the control module further includes a light-emitting diode D1 and a resistor R1; the positive electrode of the light-emitting diode D1 is connected to pin 3 of the switch SW1; the negative electrode of the light-emitting diode D1 is connected to one end of the resistor R1; and the other end of the resistor R1 is grounded.

[0009] A further solution is: the control module further includes a resistor R4; pin 4 of the MOS tube Q1 is connected to one end of the resistor R4; and the other end of the resistor R4 is connected to the positive electrode of the electrolytic capacitor C3.

[0010] A further solution is: the control module further includes a light-emitting diode D2 and a resistor R2; one end of the resistor R2 is connected to pin 5, pin 6, pin 7, and pin 8 of the MOS transistor Q1; the other end of the resistor R2 is connected to the positive electrode of the light-emitting diode D2; and the negative electrode of the light-emitting diode D3 is grounded.

[0011] A further solution is: the control module further includes a light-emitting diode D3 and a resistor R3; one end of the resistor R3 is connected to pin 5, pin 6, pin 7, and pin 8 of the MOS transistor Q1; the other end of the resistor R3 is connected to the positive electrode of the light-emitting diode D3; and the negative electrode of the light-emitting diode D3 is grounded.

[0012] A further solution is: the second filtering module includes a capacitor C2 and an electrolytic capacitor C4; one end of the capacitor C2, pin 5 of the MOS tube Q1, pin 6 of the MOS tube Q1, pin 7 of the MOS tube Q1, and pin 8 of the MOS tube Q1 are all connected to the positive electrode of the electrolytic capacitor C4; the other end of the capacitor C2 and the negative electrode of the electrolytic capacitor C4 are both grounded.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] When the power is on, power is connected through pins 1 (S), 2 (S), and 3 (S) of the high-current MOS transistor Q1, and then through pin 4 (G) of the MOS transistor Q1, forming a low-current path. This low-current path turns on the high-current MOS transistor Q1, directly connecting pins 1 (S), 2 (S), and 3 (S) of the MOS transistor Q1, as well as pins 5 (D), 6 (D), 7 (D), and 8 (D) of the MOS transistor Q1, thereby providing high-current output power. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is an electrical block diagram of a switching circuit in this embodiment;

[0016] Figure 2 FIG. 4 is a topological diagram of a switching circuit in this embodiment.

[0017] Markings and corresponding parts names in the accompanying drawings:

[0018] 100 - first filtering module; 200 - control module; 300 - second filtering module. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Example

[0021] This embodiment provides a switching circuit, such as Figure 1 As shown, it includes a first filter module 100, a control module 200, and a second filter module 300. The input end of the first filter module 100 is used to connect to the input power supply; the control module 200 includes a MOS transistor Q1, and the pins 1, 2, 3, and 4 of the MOS transistor Q1 are all connected to the output end of the first filter module 100; the input end of the second filter module 300 is connected to the pins 5, 6, 7, and 8 of the MOS transistor Q1. When in use, the power supply is connected through the pins 1 (S pole) of the high-current MOS transistor Q1, the pins 2 (S pole) of the MOS transistor Q1, and the pins 3 (S pole) of the MOS transistor Q1, and forms a low-current path through the pin 4 (G pole) of the MOS transistor Q1. The high-current MOS tube Q1 is turned on by utilizing the small current path. Pin 1 (S pole) of the MOS tube Q1, pin 2 (S pole) of the MOS tube Q1, pin 3 (S pole) of the MOS tube Q1, pin 5 (D pole) of the MOS tube Q1, pin 6 (D pole) of the MOS tube Q1, pin 7 (D pole) of the MOS tube Q1, and pin 8 (D pole) of the MOS tube Q1 are directly turned on to provide a high-current output power supply.

[0022] In this embodiment, if Figure 2 As shown, the first filtering module 100 includes a capacitor C1 and an electrolytic capacitor C3; one end of the capacitor C1 and the positive electrode of the electrolytic capacitor C3 are used to connect to the input power supply; the other end of the capacitor C1 and the negative electrode of the electrolytic capacitor C3 are grounded; the positive electrode of the electrolytic capacitor C3 is connected to pin 1 of the MOS tube Q1, pin 2 of the MOS tube Q1, pin 3 of the MOS tube Q1, and pin 4 of the MOS tube Q1.

[0023] In this embodiment, if Figure 2 As shown, the control module 200 further includes a switch SW1, a resistor R5, and a Zener diode ZD1; pin 2 of the switch SW1 and the cathode of the Zener diode ZD1 are both connected to the anode of the electrolytic capacitor C3; pin 4 of the switch SW1 is connected to one end of the resistor R5; the other end of the resistor R5 is grounded; pin 5 of the switch SW1 is connected to the anode of the Zener diode ZD1 and pin 4 of the MOS transistor Q1.

[0024] In this embodiment, if Figure 2 As shown, the control module 200 further includes a light-emitting diode D1 and a resistor R1; the positive electrode of the light-emitting diode D1 is connected to pin 3 of the switch SW1; the negative electrode of the light-emitting diode D1 is connected to one end of the resistor R1; and the other end of the resistor R1 is grounded.

[0025] In this embodiment, if Figure 2 As shown, the control module 200 further includes a resistor R4; pin 4 of the MOS tube Q1 is connected to one end of the resistor R4; and the other end of the resistor R4 is connected to the positive electrode of the electrolytic capacitor C3.

[0026] In this embodiment, if Figure 2 As shown, the control module 200 further includes a light-emitting diode D2 and a resistor R2; one end of the resistor R2 is connected to pin 5, pin 6, pin 7, and pin 8 of the MOS transistor Q1; the other end of the resistor R2 is connected to the positive electrode of the light-emitting diode D2; and the negative electrode of the light-emitting diode D3 is grounded.

[0027] In this embodiment, if Figure 2 As shown, the control module 200 further includes a light-emitting diode D3 and a resistor R3; one end of the resistor R3 is connected to pin 5, pin 6, pin 7, and pin 8 of the MOS transistor Q1; the other end of the resistor R3 is connected to the positive electrode of the light-emitting diode D3; and the negative electrode of the light-emitting diode D3 is grounded.

[0028] In this embodiment, if Figure 2 As shown, the second filtering module 300 includes a capacitor C2 and an electrolytic capacitor C4; one end of the capacitor C2, pin 5 of the MOS transistor Q1, pin 6 of the MOS transistor Q1, pin 7 of the MOS transistor Q1, and pin 8 of the MOS transistor Q1 are all connected to the positive electrode of the electrolytic capacitor C4; the other end of the capacitor C2 and the negative electrode of the electrolytic capacitor C4 are both grounded.

[0029] The working principle of the switching circuit in this embodiment is as follows:

[0030] Capacitor C1 and electrolytic capacitor C3 form a first filter module 100. The input of this first filter module 100 is connected to the input power supply 12V+. Capacitor C1 filters out high-frequency interference from the input power supply, and electrolytic capacitor C3 filters out low-frequency interference from the input power supply. Capacitor C2 and electrolytic capacitor C4 form a second filter module 300. The input of second filter module 300 is connected to the output of control module 200. Capacitor C2 filters out high-frequency interference from the output power supply, and electrolytic capacitor C4 filters out low-frequency interference from the output power supply.

[0031] Switch SW1 is a self-locking pushbutton switch. When it flips upward, the device is in the off state. In this state, the voltage supplied by electrolytic capacitor C3 flows through pins 2 and 3 of switch SW1 to power LED D1. LED D1 is a red LED mounted next to switch SW1. The power flowing through LED D1 is limited by resistor R1, causing LED D1 to illuminate red. This red light is then projected onto the top plastic keycap. A red light on the keycap indicates the device is not powered on.

[0032] Pressing switch SW1 turns the device on. In this state, power is supplied through pins 1 (S), 2 (S), and 3 (S) of the high-current MOSFET Q1, then through pin 4 (G) of the MOSFET Q1, then through pins 5 and 6 of switches SW1, before finally connecting to ground through resistor R5, forming a low-current path. This low-current path turns on the high-current MOSFET Q1, directly connecting pins 1 (S), 2 (S), and 3 (S) of the MOSFET Q1, as well as pins 5 (D), 6 (D), 7 (D), and 8 (D) of the MOSFET Q1, providing high-current output power.

[0033] The voltage regulator ZD1 is used for clamping, which effectively reduces the risk of excessive power input voltage damaging the MOS tube Q1.

[0034] Resistor R4 is a discharge resistor used to release the internal charge of MOS tube Q1 when the power is turned off, effectively reducing the risk of damage to MOS tube Q1.

[0035] The MOS tube Q1 is a switch tube, which is used for opening and closing. After the MOS tube Q1 is turned on, the internal resistance of the MOS tube Q1 is small, the heat is small, and it can withstand a large current.

[0036] When MOS transistor Q1 turns on, it supplies power to green LEDs D2 and D3 through resistors R2 and R3, respectively. LED D2 is mounted above switch SW1, while LED D3 is mounted below it. When LEDs D2 and D3 illuminate green, their projection is projected onto the plastic light-guiding keycap. A green light on the keycap indicates the device is powered on. To ensure uniform green illumination when the device is powered on, LEDs D2 and D3 are mounted above and below switch SW1, respectively, ensuring that the green light is evenly distributed across the keycap.

[0037] Although the present invention has been described herein with reference to a number of illustrative embodiments thereof, it will be understood that numerous other modifications and implementations may be devised by those skilled in the art that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, the drawings, and the claims, numerous variations and modifications may be made to the components and / or arrangement of the subject combination arrangement. In addition to variations and modifications to the components and / or arrangement, other uses will also be apparent to those skilled in the art.

Claims

1. A switching circuit, characterized in that: include: A first filtering module (100), wherein an input end of the first filtering module (100) is used to connect to an input power supply; A control module (200), the control module (200) comprising a MOS transistor Q1, wherein pin 1 of the MOS transistor Q1, pin 2 of the MOS transistor Q1, pin 3 of the MOS transistor Q1, and pin 4 of the MOS transistor Q1 are all connected to the output end of the first filter module (100); A second filter module (300), wherein the input end of the second filter module (300) is connected to pin 5 of the MOS tube Q1, pin 6 of the MOS tube Q1, pin 7 of the MOS tube Q1, and pin 8 of the MOS tube Q1.

2. The switching circuit according to claim 1, wherein: The first filtering module (100) comprises a capacitor C1 and an electrolytic capacitor C3; One end of the capacitor C1 and the positive electrode of the electrolytic capacitor C3 are both used to connect to the input power supply; The other end of the capacitor C1 and the negative electrode of the electrolytic capacitor C3 are both grounded; The positive electrode of the electrolytic capacitor C3 is connected to pin 1 of the MOS transistor Q1 , pin 2 of the MOS transistor Q1 , pin 3 of the MOS transistor Q1 , and pin 4 of the MOS transistor Q1 .

3. The switching circuit according to claim 2, wherein: The control module (200) further includes a switch SW1, a resistor R5 and a voltage stabilizing diode ZD1; Pin 2 of the switch SW1 and the cathode of the voltage stabilizing diode ZD1 are connected to the anode of the electrolytic capacitor C3; Pin 4 of the switch SW1 is connected to one end of the resistor R5; The other end of the resistor R5 is grounded; Pin 5 of the switch SW1 is connected to the anode of the voltage stabilizing diode ZD1 and pin 4 of the MOS transistor Q1 .

4. The switching circuit according to claim 3, wherein: The control module (200) further includes a light emitting diode D1 and a resistor R1; The anode of the light emitting diode D1 is connected to pin 3 of the switch SW1; The cathode of the light emitting diode D1 is connected to one end of the resistor R1; The other end of the resistor R1 is grounded.

5. The switching circuit according to claim 3, wherein: The control module (200) further includes a resistor R4; Pin 4 of the MOS tube Q1 is connected to one end of the resistor R4; The other end of the resistor R4 is connected to the positive electrode of the electrolytic capacitor C3.

6. The switching circuit according to claim 5, wherein: The control module (200) further includes a light emitting diode D2 and a resistor R2; One end of the resistor R2 is connected to pin 5 of the MOS tube Q1, pin 6 of the MOS tube Q1, pin 7 of the MOS tube Q1, and pin 8 of the MOS tube Q1; The other end of the resistor R2 is connected to the positive electrode of the light emitting diode D2; The cathode of the light emitting diode D3 is grounded.

7. The switching circuit according to claim 5, wherein: The control module (200) further includes a light emitting diode D3 and a resistor R3; One end of the resistor R3 is connected to pin 5, pin 6, pin 7, and pin 8 of the MOS tube Q1; The other end of the resistor R3 is connected to the positive electrode of the light emitting diode D3; The cathode of the light emitting diode D3 is grounded.

8. The switching circuit according to claim 5, wherein: The second filtering module (300) includes a capacitor C2 and an electrolytic capacitor C4; One end of the capacitor C2, pin 5 of the MOS tube Q1, pin 6 of the MOS tube Q1, pin 7 of the MOS tube Q1, and pin 8 of the MOS tube Q1 are all connected to the positive electrode of the electrolytic capacitor C4; The other end of the capacitor C2 and the negative electrode of the electrolytic capacitor C4 are both grounded.

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