A switching control circuit
By using a switching control circuit composed of P-channel MOSFETs and NPN transistors, the problems of high power consumption and low reliability caused by set-top box malfunctions in routers are solved, ensuring the normal operation of the controlled circuit when the main control circuit fails, thus improving the efficiency and lifespan of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN ZHAOCHI DIGITAL TECH CO LTD
- Filing Date
- 2025-05-12
- Publication Date
- 2026-06-23
AI Technical Summary
In traditional switching circuit design, the router module cannot work due to abnormalities in the set-top box circuit, resulting in high power consumption and low equipment reliability of the overall product.
The switching control circuit uses a P-channel MOSFET and an NPN transistor. A voltage divider circuit is used to provide a high level when the main control circuit fails to ensure the normal operation of the controlled circuit. A capacitor is used to extend the switching time and avoid large current.
This technology enables the controlled circuit to continue operating normally even when the main control circuit malfunctions, reducing power consumption and improving equipment efficiency and lifespan.
Smart Images
Figure CN224401512U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of control circuits, specifically a switch control circuit. Background Technology
[0002] With the development of technologies such as the Internet of Things and 5G, people's demand for networks is increasing day by day. Previously simple network devices such as optical modems, routers, and set-top boxes can no longer meet these needs. This has led to the emergence of more powerful converged gateways, such as converged gateways that combine set-top boxes and optical modems, or set-top boxes and routers. The emergence of converged gateways has greatly facilitated network needs.
[0003] With the emergence of converged gateways, a problem arises: how to connect the power supplies of the two modules? The traditional approach is to directly connect the power supplies of the two modules together, sharing a single power source. This simplifies PCB layout but has significant limitations, such as the router lacking a standby function, leading to excessive power consumption. A switch circuit was subsequently developed to control the two separate power supplies. This allows the set-top box circuit module to control the router circuit module's startup, greatly reducing power consumption. However, another problem arises: if the set-top box circuit malfunctions, the router circuit will also stop working. Utility Model Content
[0004] The purpose of this invention is to provide a switch control circuit that will not cause the controlled circuit module to work normally when the main control circuit module malfunctions.
[0005] In this embodiment of the invention, a novel switch control circuit is provided, comprising a switch control terminal, a voltage divider circuit formed by resistors R1 and R2 connected in series, a 12V DC power supply, a power output terminal, a P-channel field-effect transistor Q1, and an NPN transistor Q2. The gate of the field-effect transistor Q1 is connected to the collector of the transistor Q2 through a resistor R3. The source of the field-effect transistor Q1 is connected to the 12V DC power supply, and the drain of the field-effect transistor Q1 is connected to the power output terminal. Resistors R1 and R2 are connected in series between the 12V DC power supply and ground. The switch control terminal is connected to the connection point of resistors R1 and R2 and is connected to the base of the transistor Q2 through a resistor R4. The collector of the transistor Q2 is also connected to the 12V DC power supply through a resistor R5, and the emitter of the transistor Q2 is grounded.
[0006] In this embodiment of the invention, the novel switch control circuit further includes a capacitor C1 disposed between the DC power supply and ground.
[0007] In this embodiment of the invention, the novel switch control circuit further includes a capacitor C2 disposed between the gate and source of the MOSFET Q1.
[0008] In this embodiment of the invention, the novel switch control circuit further includes a capacitor C3 disposed between the gate and drain of the MOSFET Q1.
[0009] Compared with existing technologies, the novel switch control circuit of this invention connects the switch control terminal to the main control circuit and the power output terminal to the controlled circuit, thereby realizing the main control circuit's switch control over the controlled circuit. Utilizing the switching characteristics of two switching transistors, P-channel MOSFET Q1 and NPN transistor Q2, the power output terminal is turned off when the main control circuit module outputs a low level to the switch control terminal, and turned on when the switch control terminal outputs a high level, supplying power to the controlled circuit module. If the main control circuit module malfunctions and the switch control terminal has no output level, a high level provided by a voltage divider circuit replaces the high level output by the switch control terminal, turning on the power output terminal. This allows the main control circuit to control the power supply to the controlled circuit, and also ensures the controlled circuit continues to operate normally even when the main control circuit malfunctions, greatly improving the equipment's efficiency and lifespan. Attached Figure Description
[0010] Figure 1 This is a circuit diagram of a novel switch control circuit according to an embodiment of the present invention. Detailed Implementation
[0011] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0012] The implementation of this utility model will be described in detail below with reference to specific embodiments.
[0013] like Figure 1 As shown in the embodiment of this utility model, a novel switch control circuit is provided, which includes a switch control terminal PON_ENABLE, a voltage divider circuit formed by resistors R1 and R2 connected in series, a 12V DC power supply V0, a power output terminal VP, a P-channel field-effect transistor Q1, and an NPN transistor Q2. The gate of the field-effect transistor Q1 is connected to the collector of the transistor Q2 through a resistor R3, the source of the field-effect transistor Q1 is connected to the 12V DC power supply V0, and the drain of the field-effect transistor Q1 is connected to the power output terminal VP.
[0014] Resistors R1 and R2 are connected in series between the 12V DC power supply V0 and ground. The switch control terminal PON_ENABLE is connected to the connection point of resistors R1 and R2, and is also connected to the base of transistor Q2 through resistor R4. The collector of transistor Q2 is also connected to the 12V DC power supply V0 through resistor R5, and the emitter of transistor Q2 is grounded.
[0015] It should be noted that the switch control terminal PON_ENABLE is used to connect to the main control circuit module (e.g., the set-top box circuit), and the power output terminal VP is used to connect to the power supply of the controlled circuit module (e.g., the router), thereby enabling the connection of two different circuit modules and enabling one circuit module (set-top box circuit) to control the switch of the other circuit module (router).
[0016] Furthermore, in this embodiment of the present invention, the novel switch control circuit further includes a capacitor C1 disposed between the 12V DC power supply V0 and ground, for filtering out noise in the current output by the 12V DC power supply V0.
[0017] In this embodiment of the invention, the novel switching control circuit further includes a capacitor C2 disposed between the gate and source of the MOSFET Q1, and a capacitor C3 disposed between the gate and drain of the MOSFET Q1. The function of capacitors C2 and C3 is to extend the switching time of the MOSFET Q1 and avoid large currents.
[0018] The working principle of the novel switch control circuit of this utility model is as follows:
[0019] When the main control circuit module outputs a low level to the switch control terminal PON_ENABLE, the NPN transistor Q2 is turned off and the P-channel MOSFET Q1 is turned off, thereby turning off the power output terminal VP.
[0020] When the output level of the switch control terminal PON_ENABLE is high, the NPN transistor Q2 is turned on and the P-channel MOSFET Q1 is turned on, thereby turning on the power output terminal VP to supply power to the controlled circuit module.
[0021] When the main control circuit module malfunctions and causes the switch control terminal PON_ENABLE to have no output level, the high level provided by the voltage divider circuit replaces the high level output by the main control circuit module. The NPN transistor Q2 is turned on, and the P-channel MOSFET Q1 is turned on, thereby turning on the power output terminal VP and supplying power to the controlled circuit module.
[0022] In summary, the novel switch control circuit of this invention connects the switch control terminal to the main control circuit and the power output terminal to the controlled circuit, thereby enabling the main control circuit to control the switch of the controlled circuit. Utilizing the switching characteristics of the P-channel MOSFET Q1 and NPN transistor Q2, when the main control circuit module outputs a low level to the switch control terminal, the power output terminal is turned off; when the switch control terminal outputs a high level, the power output terminal is turned on, supplying power to the controlled circuit module. If the main control circuit module malfunctions, resulting in no output level at the switch control terminal, a high level provided by the voltage divider circuit replaces the high level output from the switch control terminal, turning on the power output terminal. This allows the main control circuit to control the power supply to the controlled circuit while ensuring the controlled circuit continues to operate normally even when the main control circuit malfunctions, significantly improving the equipment's efficiency and lifespan.
[0023] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A novel switch control circuit, characterized in that, The device includes a switch control terminal, a voltage divider circuit formed by resistors R1 and R2 connected in series, a 12V DC power supply, a power output terminal, a P-channel field-effect transistor Q1, and an NPN transistor Q2. The gate of the field-effect transistor Q1 is connected to the collector of the transistor Q2 through a resistor R3. The source of the field-effect transistor Q1 is connected to the 12V DC power supply, and the drain of the field-effect transistor Q1 is connected to the power output terminal. Resistors R1 and R2 are connected in series between the 12V DC power supply and ground. The switch control terminal is connected to the junction of resistors R1 and R2 and is also connected to the base of the transistor Q2 through a resistor R4. The collector of the transistor Q2 is also connected to the 12V DC power supply through a resistor R5. The emitter of the transistor Q2 is grounded.
2. The novel switch control circuit as described in claim 1, characterized in that, It also includes a capacitor C1 disposed between the DC power supply and ground.
3. The novel switch control circuit as described in claim 2, characterized in that, It also includes capacitor C2, which is located between the gate and source of the field-effect transistor Q1.
4. The novel switch control circuit as described in claim 1, characterized in that, It also includes capacitor C3, which is located between the gate and drain of the field-effect transistor Q1.