A MOS tube and relay switching circuit
By designing a MOS tube and relay switching circuit, using the combined automatic switching function of MOS and relay, the problems of insufficient stability at high current and high cost and large size of the dual relay scheme in the prior art are solved, and high power and stable large current output are achieved.
Patent Information
- Application Number
- CN202421417846.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-20
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-20
AI Technical Summary
The existing MOS tube charging and discharging schemes are insufficient in stability when the current exceeds 200A, and the overcurrent protection cutoff is likely to cause the MOS tube to break down; while the dual relay power circuit scheme is costly and large in size.
A MOS tube and relay switching circuit is designed, and the automatic switching between MOS and relays is achieved by combining the front-end analog acquisition unit, MCU control unit, shunt acquisition unit, relay, battery pack, MOS tube Q1, MOS tube Q2, fuse F1 and resistor R1 to ensure the stability of the circuit and high power output.
Under 140V, a high current output of more than 200A is achieved, and the stability of the power circuit is ensured, the risk of MOS tube breakdown is reduced, and the high cost and large volume problems of the dual relay solution are avoided.
Smart Images
Figure CN222721166U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of charging, in particular to a MOS tube and a relay switching circuit. Background Art
[0002] Generally, charging and discharging is only done through MOS or only through relays, or dual relays are used to switch charging and discharging. The power circuit of the current MOS tube charging and discharging solution is not stable enough when the current exceeds 200A, and the overcurrent protection is cut off, which can easily cause the MOS tube to break down. The dual relay power circuit solution is costly and large in size. Utility Model Content
[0003] In order to make up for the deficiencies of the prior art, the embodiments of the present application solve the problems in the prior art by providing a MOS tube and a relay switching circuit.
[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:
[0005] A MOS tube and relay switching circuit comprises a front-end analog acquisition unit, an MCU control unit, a shunt acquisition unit, a relay, a battery pack, a MOS tube Q1, a MOS tube Q2, a fuse F1 and a resistor R1. The battery pack is composed of a plurality of batteries connected in series, the positive electrode of each battery is connected to the front-end analog acquisition unit, the positive electrode B+ of the battery pack is connected to the fuse F1 and the front-end analog acquisition unit, the other end of the fuse F1 is connected to the drain of the MOS tube Q1 and the port RL+ of the relay, the source of the MOS tube Q1 is connected to the source of the MOS tube Q2, the gate of the MOS tube Q1 of the front-end analog acquisition unit, the gate of the MOS tube Q2, the MCU control unit and the shunt acquisition unit, the negative electrode B- of the battery pack is connected to the shunt acquisition unit, the MCU control unit is connected to the port CO+ of the relay, the drain of the MOS tube Q2 is connected to the resistor R1, and the other end of the resistor R1 is connected to the port RL- of the relay.
[0006] As a further technical solution of the utility model: the port CO- of the relay is grounded.
[0007] As a further technical solution of the utility model: the MOS tube Q1 is a P-MOS tube.
[0008] As a further technical solution of the utility model: the MOS tube Q2 is a P-MOS tube.
[0009] As a further technical solution of the present utility model: the MCU control unit is a single chip microcomputer.
[0010] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
[0011] Under the condition of 140V, the MOS and the relay are used in combination, firstly, a large current of more than 200A can be realized and the stability of the power circuit is guaranteed, and secondly, the MOS can automatically switch the relay. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a circuit diagram of the utility model. DETAILED DESCRIPTION
[0013] The technical solutions in the embodiments of the utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0014] Reference Figure 1 A MOS tube and relay switching circuit includes a front-end analog acquisition unit, an MCU control unit, a shunt acquisition unit, a relay, a battery pack, a MOS tube Q1, a MOS tube Q2, a fuse F1 and a resistor R1. The battery pack is composed of a plurality of batteries connected in series, the positive electrode of each battery is connected to the front-end analog acquisition unit, the positive electrode B+ of the battery pack is connected to the fuse F1 and the front-end analog acquisition unit, the other end of the fuse F1 is connected to the drain of the MOS tube Q1 and the port RL+ of the relay, the source of the MOS tube Q1 is connected to the source of the MOS tube Q2, the gate of the MOS tube Q1 of the front-end analog acquisition unit, the gate of the MOS tube Q2, the MCU control unit and the shunt acquisition unit, the negative electrode B- of the battery pack is connected to the shunt acquisition unit, the MCU control unit is connected to the port CO+ of the relay, the drain of the MOS tube Q2 is connected to the resistor R1, and the other end of the resistor R1 is connected to the port RL- of the relay.
[0015] The terminal CO- of the relay is grounded. The MOS tube Q1 is a P-MOS tube. The MOS tube Q2 is a P-MOS tube. The MCU control unit is a single chip microcomputer.
[0016] Here’s how it works:
[0017] The continuous current is within 140V and above 200A. The main part is a set of charging and discharging MOS and a relay. Under normal circumstances, the MOS circuit and the relay circuit are open. Due to the current limiting resistor R1, the resistance value difference between the two circuits, the large current flows through the relay, and the MOS basically does not flow current; when the voltage is under, when the charger is connected, the MOS circuit will be opened to detect the voltage of the charging and discharging port, and the relay will be opened if it is normal.
[0018] In this solution, under 140V conditions, MOS and relays are used in combination. First, it can achieve a large current of more than 200A and ensure the stability of the power circuit. Second, it can realize automatic switching of MOS relays.
[0019] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.
[0020] In addition, it should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment have also been appropriately combined to form other implementation modes that are easy for those skilled in the art to understand.
Claims
1. A MOS tube and relay switching circuit, comprising a front-end analog acquisition unit, an MCU control unit, a shunt acquisition unit, a relay, a battery pack, a MOS tube Q1, a MOS tube Q2, a fuse F1 and a resistor R1, characterized in that: The battery pack is composed of a plurality of batteries connected in series, the positive electrode of each battery is connected to the front-end analog acquisition unit, the positive electrode B+ of the battery pack is connected to the fuse F1 and the front-end analog acquisition unit, the other end of the fuse F1 is connected to the drain of the MOS tube Q1 and the port RL+ of the relay, the source of the MOS tube Q1 is connected to the source of the MOS tube Q2, the gate of the front-end analog acquisition unit MOS tube Q1, the gate of the MOS tube Q2, the MCU control unit and the shunt acquisition unit, the negative electrode B- of the battery pack is connected to the shunt acquisition unit, the MCU control unit is connected to the port CO+ of the relay, the drain of the MOS tube Q2 is connected to the resistor R1, and the other end of the resistor R1 is connected to the port RL- of the relay.
2. A MOS tube and relay switching circuit according to claim 1, characterized in that: Terminal CO- of the relay is grounded.
3. A MOS tube and relay switching circuit according to claim 1, characterized in that: The MOS tube Q1 is a P-MOS tube.
4. A MOS tube and relay switching circuit according to claim 1, characterized in that: The MOS tube Q2 is a P-MOS tube.
5. A MOS tube and relay switching circuit according to claim 1, characterized in that: The MCU control unit is a single chip microcomputer.