Battery reverse connection prevention circuit for audio equipment and electronic equipment
By using a battery reverse connection protection circuit composed of MOSFETs in audio equipment, the problem of reverse connection between the battery and charger is solved, achieving safe operation and low loss, and improving battery life.
Patent Information
- Application Number
- CN202422291195.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-09-19
AI Technical Summary
Traditional technologies are ineffective in preventing reverse connection of batteries and chargers with positive and negative terminals, resulting in significant energy loss, shortened battery life, and the risk of reverse soldering during welding.
The battery reverse connection protection circuit, which uses MOSFETs, detects whether the battery and charger are connected in reverse to prevent reverse connection, and the power loss generated by the MOSFETs is minimal.
It ensures safe operation of the battery and charger, reduces power loss, increases battery life, and avoids reverse soldering during welding.
Smart Images
Figure CN223625593U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery charging and discharging technology, and in particular to a battery reverse connection protection circuit and electronic device for audio equipment. Background Technology
[0002] Batteries are increasingly used in various fields and devices. Traditional technology mainly prevents reverse connection of batteries through their structure, such as using the positive terminal to be raised and the negative terminal to be flat. However, this solution is not suitable for batteries with both positive and negative terminals being flat.
[0003] Therefore, the purpose of this utility model is to provide a new technical solution to solve the existing technical defects. Utility Model Content
[0004] Based on this, the present invention provides a battery reverse connection protection circuit and electronic device for audio equipment, which can prevent the battery from being installed in reverse.
[0005] In a first aspect, this utility model provides a reverse connection protection circuit for a battery in an audio device, comprising: a first P-channel MOSFET, the drain of the first P-channel MOSFET being connected to the positive terminal of the battery mounting point, the drain of the first P-channel MOSFET being connected to the gate of a first N-channel MOSFET via a first resistor, the source of the first P-channel MOSFET being connected to a power supply input terminal, the power supply input terminal being used to connect to an electrical device to provide power to the electrical device, the gate and source of the first P-channel MOSFET being connected via a second resistor, the gate of the first P-channel MOSFET being connected to the drain of the first N-channel MOSFET, the source of the first N-channel MOSFET being grounded, and the gate of the first N-channel MOSFET being connected to the negative terminal of the battery mounting point via a third resistor.
[0006] Secondly, this utility model embodiment provides a reverse connection protection circuit for a battery in an audio device, comprising: a second P-channel MOSFET, the drain of the second P-channel MOSFET being connected to the anode of a diode via a fourth resistor, the cathode of the diode being connected to the gate of a second N-channel MOSFET, the drain of the second P-channel MOSFET being connected to a charging input terminal, the charging input terminal being used to connect to a charger to obtain electrical energy from the charger, the source of the second N-channel MOSFET being grounded, the drain of the second N-channel MOSFET being connected to the gate of the second P-channel MOSFET, the drain of the second N-channel MOSFET being connected to the source of the second P-channel MOSFET via a fifth resistor, the source of the second P-channel MOSFET being connected to a battery mounting terminal, the battery mounting terminal being grounded via a capacitor.
[0007] Thirdly, this utility model embodiment provides a battery reverse connection protection circuit for audio equipment, which is connected in series in the main power supply circuit. The battery reverse connection protection circuit for audio equipment includes: a battery reverse connection protection module and a charger reverse connection protection module.
[0008] The battery reverse connection protection module includes: a first P-channel MOSFET, the drain of which is connected to the positive terminal of the battery mounting point, the drain of which is also connected to the gate of a first N-channel MOSFET via a first resistor, the source of which is connected to a power supply input terminal, the power supply input terminal being used to connect to an electrical device to provide power to the device, the gate and source of which are also connected via a second resistor, the gate of which is also connected to the drain of the first N-channel MOSFET, the source of which is grounded, and the gate of which is also connected to the negative terminal of the battery mounting point via a third resistor.
[0009] The charger reverse connection protection module includes: the drain of a second P-channel MOSFET is connected to the anode of a diode via a fourth resistor; the cathode of the diode is connected to the gate of a second N-channel MOSFET; the drain of the second P-channel MOSFET is also connected to a charging input terminal, which is used to connect to a charger to obtain power from the charger; the source of the second N-channel MOSFET is grounded; the drain of the second N-channel MOSFET is connected to the gate of the second P-channel MOSFET; the drain of the second N-channel MOSFET is also connected to the source of the second P-channel MOSFET via a fifth resistor; the source of the second P-channel MOSFET is also connected to a battery mounting terminal, which is grounded via a capacitor.
[0010] Fourthly, the present invention provides an electronic device, including the battery reverse connection protection circuit for audio devices provided in the first aspect of the present invention, or the battery reverse connection protection circuit for audio devices provided in the second aspect of the present invention, or the battery reverse connection protection circuit for audio devices provided in the third aspect of the present invention.
[0011] This utility model embodiment can detect whether the battery and / or charger are connected in reverse through a simple circuit, and can also avoid the problem of the circuit or battery being burned due to reverse soldering when the operator solders the circuit, thereby ensuring the safe operation of the battery and the electrical device. In addition, the above-mentioned reverse connection protection circuit for audio equipment uses a MOSFET. When the circuit is turned on, the internal resistance of the MOSFET is extremely low, and the power loss generated on the MOSFET is minimal, thereby reducing the power loss of the circuit and improving the battery life. Attached Figure Description
[0012] Figure 1 A schematic diagram of a battery reverse connection protection circuit for audio equipment provided in this embodiment of the present invention;
[0013] Figure 2 Another schematic diagram of a reverse connection protection circuit for a battery in an audio device provided by an embodiment of this utility model;
[0014] Figure 3 A schematic diagram of the structure of an electronic device provided in an embodiment of this utility model. Detailed Implementation
[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not the entire structure.
[0016] Traditional reverse connection protection for batteries primarily relies on the battery's structure, such as the raised positive terminal and flat negative terminal, for foolproof protection (also known as reverse connection / reverse installation protection). However, this structure is unsuitable for batteries with flat positive and negative terminals. Alternatively, in some cases, the forward conduction and reverse cutoff characteristics of diodes are utilized, with the diode connected in series in the circuit to achieve reverse connection protection. However, diodes have a voltage drop of approximately 0.5V, resulting in a voltage loss of about 0.5V for the entire circuit. For a circuit powered by a single alkaline battery, this equates to a 30% loss of charge, and for a circuit powered by two alkaline batteries, it's equivalent to a 15% loss, significantly reducing battery life. Therefore, the technical solution provided by this invention aims to solve the technical problems existing in traditional technologies.
[0017] like Figure 1As shown, the reverse connection protection circuit for audio equipment provided in this embodiment of the present invention includes a first P-channel MOSFET Q1, a first N-channel MOSFET Q2, a first resistor R1, a second resistor R2, and a third resistor R3. The drain of the first P-channel MOSFET Q1 is connected to the positive terminal B+ of the battery mounting point. The drain of the first P-channel MOSFET Q1 is also connected to the gate of the first N-channel MOSFET Q2 through the first resistor R1. The source of the first P-channel MOSFET Q1 is connected to the power supply input terminal VC1, which is used to connect to an electrical device to provide power to the device through the battery. The gate and source of the first P-channel MOSFET Q1 are also connected through the second resistor R2. The gate of the first P-channel MOSFET Q1 is also connected to the drain of the first N-channel MOSFET Q2. The source of the first N-channel MOSFET Q2 is grounded. The gate of the first N-channel MOSFET Q2 is also connected to the negative terminal B- of the battery mounting point through the third resistor R3.
[0018] Specifically, the positive terminal B+ and the negative terminal B- of the battery mounting point are connected to the two electrodes of the battery, respectively. The power input terminal VC1 is connected to the main power supply circuit to provide power to the device. When the battery is connected in the correct orientation, that is, when the positive terminal of the battery is connected to the positive terminal B+ of the battery mounting point and the negative terminal of the battery is connected to the negative terminal B- of the battery mounting point, the battery provides a positive voltage to the positive terminal B+ of the battery mounting point. In this way, the positive terminal B+ of the battery mounting point provides a high level to the gate of the first N-channel MOSFET Q2 through the first resistor R1, so that the first N-channel MOSFET Q2 is turned on. The turning on of the first N-channel MOSFET Q2 pulls down the gate level of the first P-channel MOSFET Q1, thereby turning on the first P-channel MOSFET Q1. The turning on of the first P-channel MOSFET Q1 allows the battery to provide power to the device through the first P-channel MOSFET Q1.
[0019] When the battery is reverse-connected, i.e., the negative terminal of the battery is connected to the positive terminal B+ of the battery mounting point, and the positive terminal of the battery is connected to the negative terminal B- of the battery mounting point, the voltage at the positive terminal B+ of the battery mounting point is negative. In this way, the positive terminal B+ of the battery mounting point provides a low level to the gate of the first N-channel MOSFET Q2 through the first resistor R1, causing the first N-channel MOSFET Q2 to be turned off. The turn-off of the first N-channel MOSFET Q2 prevents the gate voltage of the first P-channel MOSFET Q1 from being pulled low, thereby causing the first P-channel MOSFET Q1 to be turned off. The turn-off of the first P-channel MOSFET Q1 prevents the battery from providing power to the electrical device through the first P-channel MOSFET Q1.
[0020] This achieves the function of preventing reverse battery installation, ensuring the safe operation of the battery and electrical devices (such as audio equipment); furthermore, the reverse connection protection circuit for audio equipment uses a MOSFET, which has extremely low internal resistance when the circuit is turned on, resulting in minimal power loss on the MOSFET, thereby reducing circuit power consumption and improving battery life.
[0021] In one embodiment, a reverse connection protection circuit for a battery in an audio device is also provided, such as... Figure 2 As shown, the reverse connection protection circuit for the battery in the audio device includes: a second P-channel MOSFET Q3, the drain of the second P-channel MOSFET Q3 is connected to the positive terminal of diode D1 through a fourth resistor R4, the negative terminal of diode D1 is connected to the gate of the second N-channel MOSFET Q4, the drain of the second P-channel MOSFET Q3 is also connected to the charging input terminal VCHARG, which is used to connect a charger to obtain power from the charger and charge the battery, the source of the second N-channel MOSFET Q4 is grounded, the drain of the second N-channel MOSFET Q4 is connected to the gate of the second P-channel MOSFET Q3, the drain of the second N-channel MOSFET Q4 is also connected to the source of the second P-channel MOSFET Q3 through a fifth resistor R5, the source of the second P-channel MOSFET Q3 is also connected to the battery mounting terminal VC2, and the battery mounting terminal VC2 is grounded through capacitor C1.
[0022] Specifically, the charging input terminal VCHARG is connected to the output terminal of the charger. When the charger is connected in the positive direction, the voltage provided by the charger to the charging input terminal VCHARG is positive. The charging input terminal VCHARG provides a high level to the gate of the second N-channel MOSFET Q4 through the fourth resistor R4 and diode D1, turning on the second N-channel MOSFET Q4. The turning on of the second N-channel MOSFET Q4 will pull down the gate level of the second P-channel MOSFET Q3, thereby turning on the second P-channel MOSFET Q3, and thus allowing the charger to charge the battery through the second P-channel MOSFET Q3.
[0023] When the charger is reverse-connected, the voltage supplied to the charging input terminal VCHARG by the charger is negative. The charging input terminal VCHARG cannot provide a high level to the gate of the second N-channel MOSFET Q4 through R4 and D1, causing the second N-channel MOSFET Q4 to be cut off. The cutoff of the second N-channel MOSFET Q4 will prevent the gate level of the second P-channel MOSFET Q3 from being pulled low, thus causing the second P-channel MOSFET Q3 to be cut off. The reverse voltage loop is cut off, which in turn prevents the charger from charging the battery through the second P-channel MOSFET Q3.
[0024] This achieves the function of preventing the charger from being installed backwards, and also avoids the problem of the operator burning out the circuit or battery due to reverse soldering, ensuring the safe operation of the circuit or battery. In addition, the reverse connection protection circuit uses a MOSFET. When the circuit is turned on, the internal resistance of the MOSFET is extremely low, and the power loss generated on the MOSFET is minimal, thereby reducing the power loss of the circuit and improving the battery life.
[0025] In one embodiment, a reverse connection protection circuit for a battery in an audio device is also provided. This reverse connection protection circuit is connected in series in the main power supply circuit. The reverse connection protection circuit may include a battery reverse connection protection module and a charger reverse connection protection module. In this embodiment, the charger reverse connection protection module (e.g., Figure 2 One end of the battery is connected to the charger, and the other end is connected to the battery; the reverse connection protection module in this embodiment (such as...) Figure 1 One end of the device is connected to the battery, and the other end is connected to the main power supply circuit of the electrical device.
[0026] In this embodiment, see Figure 1 The aforementioned battery reverse connection protection module may include a first P-channel MOSFET Q1, a first N-channel MOSFET Q2, a first resistor R1, a second resistor R2, and a third resistor R3. The drain of the first P-channel MOSFET Q1 is connected to the positive terminal B+ of the battery mounting point. The drain of the first P-channel MOSFET Q1 is also connected to the gate of the first N-channel MOSFET Q2 through the first resistor R1. The source of the first P-channel MOSFET Q1 is connected to the power supply input terminal VC1, which is used to connect to an electrical device to provide power to the device through the battery. The gate and source of the first P-channel MOSFET Q1 are also connected through the second resistor R2. The gate of the first P-channel MOSFET Q1 is also connected to the drain of the first N-channel MOSFET Q2. The source of the first N-channel MOSFET Q2 is grounded. The gate of the first N-channel MOSFET Q2 is also connected to the negative terminal B- of the battery mounting point through the third resistor R3.
[0027] See Figure 2The aforementioned reverse connection protection module for the charger may include a second P-channel MOSFET Q3. The drain of the second P-channel MOSFET Q3 is connected to the positive terminal of diode D1 through a fourth resistor R4. The negative terminal of diode D1 is connected to the gate of the second N-channel MOSFET Q4. The drain of the second P-channel MOSFET Q3 is also connected to the charging input terminal VCHARG, which is used to connect to the charger to obtain power from the charger and charge the battery. The source of the second N-channel MOSFET Q4 is grounded. The drain of the second N-channel MOSFET Q4 is connected to the gate of the second P-channel MOSFET Q3. The drain of the second N-channel MOSFET Q4 is also connected to the source of the second P-channel MOSFET Q3 through a fifth resistor R5. The source of the second P-channel MOSFET Q3 is also connected to the battery mounting terminal VC2, which is grounded through capacitor C1.
[0028] It should be noted that the specific working principle of the battery reverse connection protection module and the charger reverse connection protection module in this embodiment can be referred to the description in the previous embodiment, and will not be repeated here.
[0029] In this way, by connecting the battery reverse connection protection module and the charger reverse connection protection module in series in the main power supply circuit, not only is it possible to prevent the battery from being installed in reverse, but it is also possible to prevent the charger from being connected in reverse. It can also avoid the problem of the operator burning out the circuit or battery due to reverse soldering when soldering the circuit, thereby ensuring the safe operation of the battery and the electrical device. Furthermore, the battery reverse connection protection module and the charger reverse connection protection module both use MOSFETs. When the circuit is turned on, the internal resistance of the MOSFET is extremely low, and the power loss generated on the MOSFET is minimal, thereby reducing the power loss of the circuit and improving the battery life.
[0030] In one embodiment, an electronic device (such as an audio device) is also provided, such as Figure 3 As shown, the electronic device may include the reverse connection protection circuit 10 for audio devices described in any of the above embodiments.
[0031] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0032] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A reverse connection protection circuit for batteries in audio equipment, characterized in that, include: The first P-channel MOSFET has its drain connected to the positive terminal of the battery mounting point. The drain of the first P-channel MOSFET is also connected to the gate of a first N-channel MOSFET via a first resistor. The source of the first P-channel MOSFET is connected to a power input terminal, which is used to connect to an electrical device to provide power to the device. The gate and source of the first P-channel MOSFET are also connected via a second resistor. The gate of the first P-channel MOSFET is also connected to the drain of the first N-channel MOSFET. The source of the first N-channel MOSFET is grounded. The gate of the first N-channel MOSFET is also connected to the negative terminal of the battery mounting point via a third resistor.
2. A reverse connection protection circuit for batteries in audio equipment, characterized in that, include: The second P-channel MOSFET has its drain connected to the anode of a diode via a fourth resistor. The cathode of the diode is connected to the gate of the second N-channel MOSFET. The drain of the second P-channel MOSFET is also connected to a charging input terminal, which is used to connect to a charger to obtain power from the charger. The source of the second N-channel MOSFET is grounded, and its drain is connected to the gate of the second P-channel MOSFET. The drain of the second N-channel MOSFET is also connected to the source of the second P-channel MOSFET via a fifth resistor. The source of the second P-channel MOSFET is also connected to a battery mounting terminal, which is grounded via a capacitor.
3. A reverse connection protection circuit for batteries in audio equipment, characterized in that, Connected in series in the main power supply circuit, the battery reverse connection protection circuit for audio equipment includes: a battery reverse connection protection module and a charger reverse connection protection module; The battery reverse connection protection module includes: a first P-channel MOSFET, the drain of which is connected to the positive terminal of the battery mounting point, the drain of which is also connected to the gate of a first N-channel MOSFET via a first resistor, the source of which is connected to a power supply input terminal, the power supply input terminal being used to connect to an electrical device to provide power to the device, the gate and source of which are also connected via a second resistor, the gate of which is also connected to the drain of the first N-channel MOSFET, the source of which is grounded, and the gate of which is also connected to the negative terminal of the battery mounting point via a third resistor. The charger reverse connection protection module includes: the drain of a second P-channel MOSFET is connected to the anode of a diode via a fourth resistor; the cathode of the diode is connected to the gate of a second N-channel MOSFET; the drain of the second P-channel MOSFET is also connected to a charging input terminal, which is used to connect to a charger to obtain power from the charger; the source of the second N-channel MOSFET is grounded; the drain of the second N-channel MOSFET is connected to the gate of the second P-channel MOSFET; the drain of the second N-channel MOSFET is also connected to the source of the second P-channel MOSFET via a fifth resistor; the source of the second P-channel MOSFET is also connected to a battery mounting terminal, which is grounded via a capacitor.
4. An electronic device, characterized in that, Includes a battery reverse connection protection circuit for audio devices as described in any one of claims 1-3.