Anti-reverse-connection and anti-backflow circuit applied to oil mass actuator
By designing a combination of low-voltage drop MOS tube and voltage stabilization tube in the oil volume actuator circuit, combining anti-backflow and reverse connection circuits, the problems of high voltage drop, large power consumption and ground potential rise in the prior art are solved, and a circuit design with low power consumption, high stability and multiple protection is realized.
Patent Information
- Application Number
- CN202510154046.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-12
- Publication Date
- 2025-05-09
AI Technical Summary
The existing oil volume actuator anti-reverse connection and anti-return circuits have problems such as high voltage drop, large power consumption, unsuitable for large current applications, non-reusable fuses and negative NMOS-induced ground potential rise.
An anti-reverse circuit including MOS tube Q1, a first voltage regulator tube Z1, a second resistor R2 and a second capacitor C2, and an anti-return circuit of the second voltage regulator tube Z2 and a transistor Q2 are designed. These components form a low voltage drop path to realize multiple protection measures.
This circuit effectively reduces the energy consumption of the system, ensures stability under high current applications, prevents damage to the circuit and equipment by reverse connection, backflow and surge. It is suitable for high-current load applications such as oil volume actuators.
Smart Images
Figure CN119965812A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of electronic information technology, and in particular to an anti-reverse connection and anti-backflow circuit applied to an oil quantity actuator. Background Art
[0002] The existing oil level actuator anti-reverse connection and anti-backflow circuits mainly include the following forms: diode anti-reverse connection circuit, fuse protection circuit, negative pole NMOS anti-reverse connection circuit, etc.
[0003] Although the diode reverse connection protection circuit has a low cost, it has a large voltage drop and high power consumption, and is only suitable for small current load applications, not for high current application scenarios; Although the fuse protection circuit has a low cost and no on-state voltage drop, it is easy to damage the power supply and cannot be reused once damaged; The working principle of the negative NMOS anti-reverse connection circuit is similar to that of the PMOS. Both control the current direction through the conduction characteristics of the MOSFET. However, when the NMOS tube is turned on, it may cause the potential of the circuit grounding point to rise, thereby affecting the grounding effect of the entire system. Summary of the invention
[0004] To this end, the present invention provides an anti-reverse connection and anti-backflow circuit applied to an oil level actuator, which has a small conduction voltage drop, low system power consumption, and can effectively prevent backflow and reverse connection, and is suitable for large current load applications such as oil level actuators.
[0005] In order to solve the above technical problems, the present invention provides an anti-reverse connection and anti-backflow circuit applied to an oil level actuator, comprising: An anti-reverse connection circuit, the anti-reverse connection circuit comprising a first resistor R1, a first capacitor C1, a MOS tube Q1, a first voltage regulator tube Z1, a second resistor R2, and a second capacitor C2; The drain of the MOS tube Q1 is connected to the input power supply VIN, one end of each of the first resistor R1 and the first capacitor C1 is connected to the drain of the MOS tube Q1, the positive electrode of the first voltage regulator tube Z1 is connected to the gate of the MOS tube Q1, the negative electrode of the first voltage regulator tube Z1 is connected to the source of the MOS tube Q1, and the source of the MOS tube Q1 is the output end VOUT; The gate of the MOS transistor Q1 is connected to one end of the second resistor R2 and one end of the second capacitor C2 respectively, and the other end of the second resistor R2 and the second capacitor C2 is connected to the ground GND respectively.
[0006] In one embodiment of the present invention, a backflow prevention circuit is also included, and the backflow prevention circuit includes a second voltage regulator tube Z2 and a transistor Q2; Among them, the emitter of the transistor Q2 is connected to the output end VOUT, the base of the transistor Q2 is connected to the other end of the first resistor R1 and the first capacitor C1 respectively, the collector of the transistor Q2 is connected to the negative electrode of the second voltage regulator Z2, and the positive electrode of the second voltage regulator Z2 is connected to the ground end GND.
[0007] In an embodiment of the present invention, an output filter circuit is further included. The output filter circuit includes a third capacitor C3. Two ends of the third capacitor C3 are respectively connected to the output terminal VOUT and the ground terminal GND.
[0008] In one implementation of the present invention, the third capacitor C3 is a ceramic capacitor.
[0009] In one embodiment of the present invention, the MOS transistor Q1 is a PMOS.
[0010] The above technical solution of the present invention has the following advantages compared with the prior art: The anti-reverse connection and anti-backflow circuit applied to the oil level actuator described in the present invention effectively overcomes the shortcomings of the prior art such as the high voltage drop of the diode, the non-reusable fuse, and the ground potential rise caused by the negative electrode NMOS. A low voltage drop path is formed by the MOS tube Q1 and the first voltage regulator tube Z1, which effectively reduces the energy consumption of the system; the low voltage drop ensures the stability under high current application and meets the needs of high-power loads such as the oil level actuator; under the protection of multiple protection measures such as anti-reverse connection, anti-backflow and surge clamping, the safety of the circuit and equipment can be ensured even under abnormal working conditions; when the load causes a surge due to poor contact, etc., the current backflow can be effectively prevented.
[0011] This circuit uses MOS tube Q1 and the first voltage regulator Z1. After the PMOS body diode is turned on at the beginning of power-on, the first voltage regulator Z1 is used to generate a stable voltage difference Vz between the gate and source of the MOS tube Q1, so that the gate-source bias of Q1 reaches -Vz. When -Vz is lower than the threshold voltage Vgth of the PMOS, Q1 quickly enters the full-on state to form a low on-resistance path. The energy loss during current conduction is extremely small, thereby achieving low-power operation of the entire system. The low on-resistance allows the circuit to maintain stable operation under high current conditions, and will not cause additional power consumption and heat accumulation due to excessive voltage drop. It is used in application scenarios with high current loads such as oil level actuators.
[0012] This circuit uses an anti-reverse connection circuit. In the case of reverse connection, since an effective gate-source voltage cannot be formed, the MOS tube Q1 remains in a closed state, thereby preventing the current from forming a loop and avoiding device damage caused by reverse connection.
[0013] When the output terminal VOUT of this circuit causes a sudden voltage change due to poor contact or other abnormal conditions, the transistor Q2 in the anti-backflow circuit will enter the amplification state. At the same time, combined with the voltage clamping action of the second voltage regulator Z2, the abnormal voltage can be quickly suppressed within a safe range, effectively preventing the surge current from impacting the subsequent circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.
[0015] Figure 1 The invention is a structural diagram of a reverse connection and backflow prevention circuit applied to an oil quantity actuator. DETAILED DESCRIPTION
[0016] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.
[0017] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation of the present invention.
[0018] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0019] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.
[0020] Reference Figure 1 As shown, the present invention is a circuit for preventing reverse connection and backflow applied to an oil level actuator. The oil level actuator is used as a high current load, and its power supply end is connected to the circuit. It includes: An anti-reverse connection circuit, the anti-reverse connection circuit comprising a first resistor R1, a first capacitor C1, a MOS tube Q1, a first voltage regulator tube Z1, a second resistor R2, and a second capacitor C2; The drain of the MOS tube Q1 is connected to the input power supply VIN, one end of each of the first resistor R1 and the first capacitor C1 is connected to the drain of the MOS tube Q1, the positive electrode of the first voltage regulator tube Z1 is connected to the gate of the MOS tube Q1, the negative electrode of the first voltage regulator tube Z1 is connected to the source of the MOS tube Q1, and the source of the MOS tube Q1 is the output end VOUT; The gate of the MOS transistor Q1 is connected to one end of the second resistor R2 and one end of the second capacitor C2 respectively, and the other end of the second resistor R2 and the second capacitor C2 is connected to the ground GND respectively.
[0021] Specifically, it also includes an anti-backflow circuit, which includes a second voltage regulator tube Z2 and a triode Q2; Among them, the emitter of the transistor Q2 is connected to the output end VOUT, the base of the transistor Q2 is connected to the other end of the first resistor R1 and the first capacitor C1 respectively, the collector of the transistor Q2 is connected to the negative electrode of the second voltage regulator Z2, and the positive electrode of the second voltage regulator Z2 is connected to the ground end GND.
[0022] Specifically, an output filter circuit is also included. The output filter circuit includes a third capacitor C3. Two ends of the third capacitor C3 are respectively connected to the output terminal VOUT and the ground terminal GND.
[0023] Specifically, the third capacitor C3 is a ceramic capacitor, which can effectively suppress noise and voltage fluctuations and improve the overall anti-interference performance of the system.
[0024] Specifically, the MOS tube Q1 is a PMOS.
[0025] The oil level actuator hardware anti-reverse connection and anti-backflow principle is as follows: Conductivity principle: When the power source VIN is powered on, the body diode of the MOS tube Q1 is turned on first. Due to the voltage-stabilizing characteristics of the first voltage-stabilizing tube Z1, a voltage difference Vz is formed at both ends of the MOS tube Q1. Then, the tube voltage drop of the GS of the MOS tube Q1 is -Vz<the threshold voltage Vgth of Q1, and the MOS tube Q1 is turned on normally. Anti-reverse principle: When the power supply VIN and the ground terminal GND are reversely connected, the Vgs voltage cannot be established, so no current loop can be formed after the reverse connection, so the circuit will not be damaged when reversed; Surge protection principle: In practical applications, poor contact or other factors may cause a sudden change in the output voltage VOUT, which is called surge. When the output voltage VOUT suddenly changes due to abnormal conditions, transistor Q2 is in an amplified state, effectively suppressing the change of the output VOUT and clamping the surge.
[0026] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.
Claims
1. A reverse connection and backflow prevention circuit for an oil level actuator, characterized in that: include: An anti-reverse connection circuit, the anti-reverse connection circuit comprising a first resistor R1, a first capacitor C1, a MOS tube Q1, a first voltage regulator tube Z1, a second resistor R2, and a second capacitor C2; The drain of the MOS tube Q1 is connected to the input power supply VIN, one end of each of the first resistor R1 and the first capacitor C1 is connected to the drain of the MOS tube Q1, the positive electrode of the first voltage regulator tube Z1 is connected to the gate of the MOS tube Q1, the negative electrode of the first voltage regulator tube Z1 is connected to the source of the MOS tube Q1, and the source of the MOS tube Q1 is the output end VOUT; The gate of the MOS transistor Q1 is connected to one end of the second resistor R2 and one end of the second capacitor C2 respectively, and the other end of the second resistor R2 and the second capacitor C2 is connected to the ground GND respectively.
2. According to claim 1, the anti-reverse connection and anti-backflow circuit applied to the oil level actuator is characterized in that: It also includes a backflow prevention circuit, which includes a second voltage regulator tube Z2 and a transistor Q2; Among them, the emitter of the transistor Q2 is connected to the output end VOUT, the base of the transistor Q2 is connected to the other end of the first resistor R1 and the first capacitor C1 respectively, the collector of the transistor Q2 is connected to the negative electrode of the second voltage regulator Z2, and the positive electrode of the second voltage regulator Z2 is connected to the ground end GND.
3. According to claim 1, the anti-reverse connection and anti-backflow circuit applied to the oil level actuator is characterized in that: The device further comprises an output filter circuit, wherein the output filter circuit comprises a third capacitor C3, and two ends of the third capacitor C3 are respectively connected to the output terminal VOUT and the ground terminal GND.
4. The anti-reverse connection and anti-backflow circuit for oil level actuator according to claim 3 is characterized in that: The third capacitor C3 is a ceramic capacitor.
5. The anti-reverse connection and anti-backflow circuit for oil level actuator according to claim 1, characterized in that: The MOS tube Q1 is a PMOS.