Overvoltage protection circuit
By designing overvoltage protection circuits of resistors, NPN transistors and N-MOS tubes, the equipment damage caused by the use of mismatched power adapters is solved, and equipment safety is improved and electronic waste is reduced.
Patent Information
- Application Number
- CN202421865951.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-08-05
AI Technical Summary
The use of mismatched power adapters in the prior art can cause damage to the equipment, increase environmental electronic waste, and may even cause fires.
Design an overvoltage protection circuit including resistors, NPN transistors, voltage-regulating diodes and N-MOS tubes to achieve voltage matching through logic control to avoid equipment damage.
It realizes low-cost overvoltage protection, improves equipment safety, reduces electronic waste, and avoids equipment damage and fire risks.
Smart Images
Figure CN223168031U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power supplies, and particularly relates to an overvoltage protection circuit. Background Art
[0002] With the development of electronic technology and the improvement of people's living standards, the requirements for the use safety of electronic products are getting higher and higher. Many power adapters on the market have the same output voltage interface, but different output voltages. If a power supply with a higher output voltage is connected to a device with a lower voltage, it will cause damage to the product and make it unusable, increasing electronic waste in the environment. In severe cases, it will burn out and cause a fire. Content of the Utility Model
[0003] The embodiments of the present application are to make up for the deficiencies of the prior art and solve the problem that using a mismatched power adapter will not cause damage to the device, thus increasing the safety of the device.
[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:
[0005] An overvoltage protection circuit includes a resistor R1, a resistor R2, a resistor R3, a triode Q1, a diode D1, a diode D2, and an MOS transistor Q2. One end of the resistor R1 is connected to the resistor R2, the input voltage, and the output voltage. The other end of the resistor R1 is connected to the cathode of the diode D1. The anode of the diode D1 is connected to the base of the triode Q1 and the resistor R3. The other end of the resistor R3 is connected to the resistor R4, the anode of the diode D2, the emitter of the triode Q1, the other end of the input voltage, and the source of the MOS transistor Q2. The other end of the resistor R2 is connected to the collector of the triode Q1, the cathode of the diode D2, the other end of the resistor R4, and the gate of the MOS transistor Q2. The drain of the MOS transistor Q2 is connected to the other end of the output voltage.
[0006] As a further technical solution of the utility model: The triode Q1 is an NPN triode.
[0007] As a further technical solution of the utility model: The MOS transistor Q2 is an N-MOS transistor.
[0008] As a further technical solution of the utility model: The diode D1 is a zener diode.
[0009] As a further technical solution of the utility model: The diode D2 is a zener diode.
[0010] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
[0011] 1. Design a low-cost overvoltage protection circuit using a small number of basic components.
[0012] 2. Improve the safety of product use and reduce electronic waste in the environment. Description of the Drawings
[0013] Figure 1 FIG. is a schematic diagram of an overvoltage protection circuit provided by an embodiment of the present invention;
[0014] Figure 2 FIG. is a schematic diagram of the flow of an overvoltage protection circuit provided by an embodiment of the present invention. Detailed Embodiments
[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0016] Refer to Figure 1 , an overvoltage protection circuit includes a resistor R1, a resistor R2, a resistor R3, a triode Q1, a diode D1, a diode D2, and a MOS transistor Q2. One end of the resistor R1 is connected to the resistor R2, the input voltage, and the output voltage. The other end of the resistor R1 is connected to the cathode of the diode D1. The anode of the diode D1 is connected to the base of the triode Q1 and the resistor R3. The other end of the resistor R3 is connected to the resistor R4, the anode of the diode D2, the emitter of the triode Q1, the other end of the input voltage, and the source of the MOS transistor Q2. The other end of the resistor R2 is connected to the collector of the triode Q1, the cathode of the diode D2, the other end of the resistor R4, and the gate of the MOS transistor Q2. The drain of the MOS transistor Q2 is connected to the other end of the output voltage.
[0017] The triode Q1 is an NPN triode. The MOS transistor Q2 is an N-MOS transistor. The diode D1 is a zener diode. The diode D2 is a zener diode.
[0018] The working principle is as follows:
[0019] See Figure 2 FIG. is a schematic diagram of the flow of a novel overvoltage protection circuit provided by an embodiment of the present invention, realizing the logic:
[0020] Step 1: Insert the voltage of the power adapter;
[0021] Step 2: If the input voltage > the regulated voltage value of the zener diode D1, jump to Step 3; otherwise, jump to Step 4;
[0022] Step 3: The zener diode D1 conducts, Q1 follows and conducts, causing Q2 to cut off, no voltage output, jump to Step 5;
[0023] Step 4: The voltage stabilizing diode D1 is cut off, and Q1 is cut off accordingly, resulting in the conduction of Q2 and voltage output. Then jump to Step 5;
[0024] Step 5: End.
[0025] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model.
[0026] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment have been appropriately combined to form other embodiments that are easily understood by those skilled in the art.
Claims
1. An overvoltage protection circuit, comprising a resistor R1, a resistor R2, a resistor R3, a triode Q1, a diode D1, a diode D2 and a MOS transistor Q2, characterized in that: One end of the resistor R1 is connected to the resistor R2, the input voltage, and the output voltage. The other end of the resistor R1 is connected to the cathode of the diode D1. The anode of the diode D1 is connected to the base of the triode Q1 and the resistor R3. The other end of the resistor R3 is connected to the resistor R4, the anode of the diode D2, the emitter of the triode Q1, the other end of the input voltage, and the source of the MOS transistor Q2. The other end of the resistor R2 is connected to the collector of the triode Q1, the cathode of the diode D2, the other end of the resistor R4, and the gate of the MOS transistor Q2. The drain of the MOS transistor Q2 is connected to the other end of the output voltage.
2. An overvoltage protection circuit according to claim 1, characterized in that, The triode Q1 is an NPN triode.
3. An overvoltage protection circuit according to claim 1, characterized in that, The MOS transistor Q2 is an N-MOS transistor.
4. An overvoltage protection circuit according to claim 1, wherein, The diode D1 is a zener diode.
5. An overvoltage protection circuit according to any one of claims 1-4, characterized in that, The diode D2 is a zener diode.