Monocell positive and negative connection working circuit based on MOS (Metal Oxide Semiconductor) tube and electric appliance

Abstract

The utility model discloses a single battery positive and negative connection working circuit based on MOS transistors. The single battery positive and negative connection working circuit comprises a first MOS transistor Q1, a second MOS transistor Q2, a first resistor R1, a second resistor R2, a first diode D1, a second diode D2, a battery V1 and a load RL. The battery can provide correct voltage for the polarity load all the time regardless of the mounting directions of the positive and negative electrodes of the battery, thereby avoiding the damage of a circuit or the polarity load caused by reverse mounting of the battery due to misoperation.

Description

Technical Field

[0001] The utility model relates to the field of safe use of batteries, and particularly relates to a single-battery forward and reverse connection working circuit based on MOS transistors. Background Technique

[0002] Generally in the field of electronic applications, due to some unstable factors in a single battery and the usage process, it is necessary to design some circuits to protect the internal circuit and prevent damage to the internal circuit caused by forward and reverse connection. Content of the Utility Model

[0003] The purpose of the utility model is to provide a single-battery forward and reverse connection working circuit based on MOS transistors to avoid circuit damage caused by battery reverse connection.

[0004] To solve the above technical problems, the utility model provides a technical solution: a single-battery forward and reverse connection working circuit based on MOS transistors, including a first MOS transistor Q1, a second MOS transistor Q2, a first resistor R1, a second resistor R2, a first diode D1, a second diode D2, a battery V1, and a load RL;

[0005] The battery V1 has an A2 terminal and a B2 terminal; the load RL has a P2 terminal and an N2 terminal, and the P2 terminal and the N2 terminal are respectively used to connect to a high level and a low level;

[0006] The drain of the first MOS transistor Q1 is connected to the A2 terminal of the battery V1, the source of the first MOS transistor Q1 is connected to the N2 terminal of the load RL, and the gate of the first MOS transistor Q1 is connected to the B2 terminal of the battery V1 through the first resistor R1;

[0007] The drain of the second MOS transistor Q2 is connected to the B2 terminal of the battery V1, the source of the second MOS transistor Q2 is connected to the N2 terminal of the load RL, and the gate of the second MOS transistor Q2 is connected to the A2 terminal of the battery V1 through the second resistor R2;

[0008] The positive electrode of the first diode D1 is connected to the B2 terminal of the battery V1, and the negative electrode of the first diode D1 is connected to the P2 terminal of the load RL;

[0009] The positive electrode of the second diode D2 is connected to the A2 terminal of the battery V1, and the negative electrode of the second diode D2 is connected to the P2 terminal of the load RL.

[0010] According to the above scheme, both the first diode D1 and the second diode D2 are switching diodes, and the model numbers are both 1N4148.

[0011] According to the above scheme, both the first MOS transistor Q1 and the second MOS transistor Q2 are NMOS transistors, and the model numbers are both 2N6659.

[0012] According to the above scheme, the resistance values of the first resistor R1 and the second resistor R2 are both 1 kΩ.

[0013] According to the above scheme, the model of the battery V1 is 18650.

[0014] The present utility model further provides an electrical appliance, which is provided with the MOS tube-based single-battery forward and reverse connection working circuit described above.

[0015] According to the above scheme, the first diode D1 and the second diode D2 are both switching diodes, and their models are both 1N4148.

[0016] According to the above scheme, the first MOS tube Q1 and the second MOS tube Q2 are both NMOS tubes, and their models are both 2N6659.

[0017] According to the above scheme, the resistance values of the first resistor R1 and the second resistor R2 are both 1 kΩ.

[0018] According to the above scheme, the model of the battery V1 is 18650.

[0019] The beneficial effect of the present utility model is that by setting the first MOS tube Q1 and the second MOS tube Q2, when the polarities of the A2 end and the B2 end of the battery V1 change, the on-off states of the first MOS tube Q1 and the second MOS tube Q2 change accordingly. Furthermore, no matter whether the A2 end of the battery V1 is positive or negative, the P2 end of the load RL is always at a high level and the N2 end is always at a low level. This circuit plays a protective role for the polarized loads inside the electrical appliance. Description of the Drawings

[0020] Figure 1 It is the circuit schematic diagram of the MOS tube-based single-battery forward and reverse connection working circuit according to an embodiment of the present utility model. Detailed Embodiments

[0021] To make the purposes, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the embodiments of the present disclosure. Apparently, the described embodiments are some but not all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0022] See Figure 1 , this embodiment discloses a circuit of a MOS tube-based single-battery forward and reverse connection working circuit, including a first MOS tube Q1, a second MOS tube Q2, a first resistor R1, a second resistor R2, a first diode D1, a second diode D2, a battery V1, and a load RL;

[0023] The battery V1 has terminals A2 and B2; the load RL has terminals P2 and N2, and the P2 and N2 terminals are respectively used to connect to a high level and a low level;

[0024] The drain of the first MOS transistor Q1 is connected to the A2 terminal of the battery V1, the source of the first MOS transistor Q1 is connected to the N2 terminal of the load RL, and the gate of the first MOS transistor Q1 is connected to the B2 terminal of the battery V1 through the first resistor R1;

[0025] The drain of the second MOS transistor Q2 is connected to the B2 terminal of the battery V1, the source of the second MOS transistor Q2 is connected to the N2 terminal of the load RL, and the gate of the second MOS transistor Q2 is connected to the A2 terminal of the battery V1 through the second resistor R2;

[0026] The anode of the first diode D1 is connected to the B2 terminal of the battery V1, and the cathode of the first diode D1 is connected to the P2 terminal of the load RL;

[0027] The anode of the second diode D2 is connected to the A2 terminal of the battery V1, and the cathode of the second diode D2 is connected to the P2 terminal of the load RL.

[0028] Further, both the first diode D1 and the second diode D2 are switching diodes, and the model numbers are both 1N4148, which are used to protect the battery V1 when the battery V1 is reversely connected.

[0029] Further, both the first MOS transistor Q1 and the second MOS transistor Q2 are NMOS transistors, and the model numbers are both 2N6659, which realize the conduction and cut-off of the circuit when the battery V1 is connected forward and reversely.

[0030] Further, the resistance values of both the first resistor R1 and the second resistor R2 are 1 kΩ, which are used to limit the current when the first MOS transistor Q1 and the second MOS transistor Q2 are turned on.

[0031] Further, the model number of the battery V1 is 18650.

[0032] The present utility model further provides an electrical appliance, which is provided with the MOS transistor-based single-battery forward and reverse connection working circuit described above.

[0033] Further, both the first diode D1 and the second diode D2 are switching diodes, and the model numbers are both 1N4148.

[0034] Further, both the first MOS transistor Q1 and the second MOS transistor Q2 are NMOS transistors, and the model numbers are both 2N6659.

[0035] Further, the resistance values of both the first resistor R1 and the second resistor R2 are 1 kΩ.

[0036] Further, the model number of the battery V1 is 18650.

[0037] In the forward and reverse connection working circuit of a single cell of this MOS transistor, when the A2 terminal of the battery V1 is the positive electrode and the B2 terminal is the negative electrode. The Vgs of the first MOS transistor Q1 is a negative voltage, resulting in the first MOS transistor Q1, which is an NMOS transistor, being in the off state; the Vgs of the second MOS transistor Q2, which is an NMOS transistor, is a positive voltage, meeting the on-voltage requirement, so the second MOS transistor Q2 is in the on state; the current flows out from the A2 terminal of the battery V1, passes through the node P1, flows through the second diode D2. The positive electrode of the second diode D2 is at a high voltage and conducts forward; the current flows to the load, and after passing through the load, it flows back to the negative electrode B2 of the battery V1 through the source and drain of the second MOS transistor Q2 to complete the current loop; at this time, the diode D1 is in the reverse voltage cut-off state, preventing the current from flowing directly back to the battery negative electrode, playing a role in protecting the battery.

[0038] When the A2 terminal of the battery V1 is the negative electrode and the B2 terminal is the positive electrode, the Vgs voltage of the first MOS transistor Q1 is a positive voltage and is greater than the turn-on voltage, resulting in the first MOS transistor Q1, which is an NMOS transistor, being turned on; the Vgs voltage of the second MOS transistor Q2 is a negative voltage, resulting in the second MOS transistor Q2, which is an NMOS transistor, being in the off state; the current flows out from the B2 terminal of the battery, flows through the first diode D1. The positive electrode of the first diode D1 is at a high voltage and conducts forward; the current flows to the load RL, and after passing through the load RL, it flows back to the negative electrode A2 terminal of the battery V1 through the source and drain of the first MOS transistor Q1 to complete the loop; at this time, the diode D2 is in the reverse voltage cut-off state, preventing the current from flowing directly back to the negative electrode of the battery V1, playing a role in protecting the battery.

[0039] Regardless of whether the A2 terminal of the battery V1 is the positive electrode or the negative electrode, it always makes the P2 terminal of the load RL at a high level and the N2 terminal at a low level, playing a role in protecting the load with polarity inside.

[0040] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are similarly included in the patent protection scope of the present invention.

Claims

1. A single-cell forward and reverse connection working circuit based on MOS transistors, characterized in that, It includes a first MOS transistor Q1, a second MOS transistor Q2, a first resistor R1, a second resistor R2, a first diode D1, a second diode D2, a battery V1, and a load RL; The battery V1 has terminals A2 and B2; the load RL has terminals P2 and N2, and the P2 terminal and the N2 terminal are respectively used to connect to a high level and a low level; The drain of the first MOS transistor Q1 is connected to the A2 terminal of the battery V1, the source of the first MOS transistor Q1 is connected to the N2 terminal of the load RL, and the gate of the first MOS transistor Q1 is connected to the B2 terminal of the battery V1 through the first resistor R1; The drain of the second MOS transistor Q2 is connected to the B2 terminal of the battery V1, the source of the second MOS transistor Q2 is connected to the N2 terminal of the load RL, and the gate of the second MOS transistor Q2 is connected to the A2 terminal of the battery V1 through the second resistor R2; The anode of the first diode D1 is connected to the B2 terminal of the battery V1, and the cathode of the first diode D1 is connected to the P2 terminal of the load RL; The anode of the second diode D2 is connected to the A2 terminal of the battery V1, and the cathode of the second diode D2 is connected to the P2 terminal of the load RL.

2. The single-cell forward and reverse connection working circuit based on MOS transistors according to claim 1, characterized in that Both the first diode D1 and the second diode D2 are switching diodes, and their models are both 1N4148.

3. The single-cell forward and reverse connection working circuit based on MOS transistors according to claim 1, characterized in that, Both the first MOS transistor Q1 and the second MOS transistor Q2 are NMOS transistors, and their models are both 2N6659.

4. The single-cell forward and reverse connection working circuit based on MOS transistors according to claim 1, characterized in that The resistance values of both the first resistor R1 and the second resistor R2 are 1 kΩ.

5. The single-cell forward and reverse connection working circuit based on MOS transistors according to claim 1, wherein The model of the battery V1 is 18650.

6. An electrical appliance, characterized in that, There is provided a MOS transistor-based single-battery forward and reverse connection working circuit according to any one of claims 1-4.

7. The electrical appliance according to claim 6, characterized in that, Both the first diode D1 and the second diode D2 are switching diodes, and their models are both 1N4148.

8. The electrical appliance according to claim 6, characterized in that, Both the first MOS transistor Q1 and the second MOS transistor Q2 are NMOS transistors, and their models are both 2N6659.

9. The electrical appliance according to claim 6, characterized in that, The resistance values of both the first resistor R1 and the second resistor R2 are 1 kΩ.

10. The electrical appliance according to claim 6, characterized in that, The model of the battery V1 is 18650.

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