Push rod driving circuit and three-proofing closing mechanism thereof

Abstract

The utility model provides a push rod driving circuit and a three-proofing closing mechanism thereof, and the circuit comprises an upper bridge arm driving module which comprises a first MOS tube and a second MOS tube; the lower bridge arm driving module comprises a third triode and a fourth triode; wherein the first MOS tube and the third triode as well as the second MOS tube and the fourth triode are respectively connected in series between a driving power supply and a GND (Ground); one end of the push rod is connected to an intermediate node between the first MOS tube and the third triode, and the other end of the push rod is connected to an intermediate node between the second MOS tube and the fourth triode; and the expansion and contraction of the push rod are controlled by controlling the conduction of MOS (Metal Oxide Semiconductor) tubes in the upper bridge arm driving module and the lower bridge arm driving module. Stretching and retracting of the push rod are controlled by controlling conduction of the MOS tubes of the upper bridge arm and the lower bridge arm, control signals are simple, and when errors occur, short circuit of a circuit cannot be caused, and devices cannot be damaged; and meanwhile, the driving circuit has the advantages of short response time, long service life, good electromagnetic compatibility and wide driving voltage range.

Description

TECHNICAL FIELD

[0001] The utility model relates to three prevent closing mechanism technical field, concretely relates to a push rod drive circuit and three prevent closing mechanism thereof. BACKGROUND

[0002] Three prevent closing mechanism is widely used in military field, especially in tank and other armored vehicles, and belongs to indispensable part.

[0003] At present, the push rod drive circuit of three prevent closing mechanism is mainly divided into the drive circuit based on relay and the drive circuit based on H bridge.

[0004] The drive circuit based on relay has the following shortcomings:

[0005] 1. Slow response time;

[0006] 2. Limited life: long time use, the contact may appear the phenomenon of deformation, oxidation, can increase contact resistance, and then may appear the phenomenon of poor contact and lead to unable to control push rod extension and retraction;

[0007] 3. Electromagnetic interference: the electromagnetic interference produced in the process of attracting and releasing of relay is big;

[0008] 4. Large volume.

[0009] The drive circuit based on H bridge has the following shortcomings:

[0010] 1. Complex circuit and high cost;

[0011] 2. Control signal error is easy to lead to upper and lower MOS tube short circuit;

[0012] 3. Small drive voltage adaptation range.

[0013] It is important to study a push rod drive circuit with fast response time, long life, good electromagnetic compatibility and wide drive voltage range. INVENTION CONTENTS

[0014] The first aspect of the utility model, in order to solve the above technical problem, provides a push rod drive circuit, applied to three prevent closing mechanism, including:

[0015] The upper bridge arm drive module includes a first MOS tube and a second MOS tube;

[0016] The lower bridge arm drive module includes a third triode and a fourth triode; Wherein the first MOS tube and the third triode, the second MOS tube and the fourth triode are respectively connected in series between drive power supply and GND;

[0017] A push rod, one end of which is connected to the midpoint between the first MOSFET and the third transistor, and the other end of which is connected to the midpoint between the second MOSFET and the fourth transistor; the extension and retraction of the push rod is controlled by controlling the conduction of the MOSFETs in the upper bridge arm drive module and the lower bridge arm drive module.

[0018] Furthermore, it also includes an RC spike pulse absorption module, which comprises a first diode, a second diode, a third diode, a fourth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, and an eighteenth resistor, wherein:

[0019] The cathode of the first diode is connected in series with the fifteenth resistor and the first capacitor, and then connected in parallel with the first MOS transistor.

[0020] The cathode of the second diode is connected in series with the sixteenth resistor and the second capacitor, and then connected in parallel with the second MOS transistor.

[0021] The cathode of the third diode is connected in series with the seventeenth resistor and the third capacitor, and then connected in parallel with the fifth MOS transistor.

[0022] The cathode of the fourth diode is connected in series with the eighteenth resistor and the fourth capacitor, and then connected in parallel to the sixth MOS transistor.

[0023] Furthermore, it also includes a topology circuit, through which the control signal controls the on / off state of the corresponding MOS transistor.

[0024] Furthermore, the first control signal port controls the on / off state of the fifth MOS transistor through the topology circuit composed of the third transistor, wherein:

[0025] The collector of the third transistor is connected to the gate of the fifth MOS transistor, and is connected to the power supply in series with a third resistor.

[0026] The base of the third transistor is connected in series with a seventh resistor and then connected to the first control signal port.

[0027] The emitter of the third transistor is connected to GND.

[0028] Furthermore, the second control signal port controls the on / off state of the sixth MOS transistor through the topology circuit composed of the fourth transistor, wherein:

[0029] The collector of the fourth transistor is connected to the gate of the sixth MOS transistor, and is connected to the power supply in series with a fourth resistor.

[0030] The base of the fourth transistor is connected in series with an eighth resistor and then connected to the second control signal port.

[0031] The emitter of the fourth transistor is connected to GND.

[0032] Furthermore, the first control signal port controls the on / off state of the first MOS transistor through the topology circuit composed of the eighth transistor, wherein:

[0033] The collector of the eighth transistor is connected in series with the fifth resistor and then connected to the gate of the first MOS transistor. The fifth resistor is connected in series with the first resistor and then connected to the driving power supply.

[0034] The base of the eighth transistor is connected in series with the eleventh resistor and then connected to the first control signal port.

[0035] The emitter of the eighth transistor is connected to GND.

[0036] Furthermore, the second control signal port controls the on / off state of the second MOS transistor through the topology circuit composed of the seventh transistor, wherein:

[0037] The collector of the seventh transistor is connected in series with the sixth resistor and then connected to the gate of the second MOS transistor. The sixth resistor and the second resistor are connected in series to the driving power supply.

[0038] The base of the seventh transistor is connected in series with the twelfth resistor and then connected to the second control signal port;

[0039] The emitter of the seventh transistor is connected to GND.

[0040] Furthermore, the circuit also includes a pull-down resistor module, which comprises a thirteenth resistor, a fourteenth resistor, a nineteenth resistor, and a twentieth resistor, wherein:

[0041] One end of the thirteenth resistor is connected to the base of the seventh transistor, and the other end is connected to GND;

[0042] One end of the fourteenth resistor is connected to the base of the eighth transistor, and the other end is connected to GND;

[0043] One end of the nineteenth resistor is connected to the base of the third transistor, and the other end is connected to GND;

[0044] One end of the twentieth resistor is connected to the base of the fourth transistor, and the other end is connected to GND.

[0045] Furthermore, both the first and second MOSFETs are P-type MOSFETs; and both the third and fourth transistors are N-type transistors.

[0046] A second aspect of this utility model provides a three-proof closing mechanism, including the aforementioned push rod drive circuit.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] This invention controls the extension and retraction of the push rod by controlling the conduction of the MOS transistors of the upper and lower bridge arms. Its control signal is simple and will not cause short circuits and damage to the device when errors occur. It also has the advantages of fast response time, long life, good electromagnetic compatibility and wide driving voltage range (DC12V~DC33V). Attached Figure Description

[0049] Figure 1 This is a circuit schematic diagram disclosed in an embodiment of the present utility model. Detailed Implementation

[0050] To make the technical solutions and effects of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0051] This utility model aims to provide a push rod drive circuit for use in a three-proof closing mechanism, which achieves the effect of simple control signal and prevents short circuit and damage to components when errors occur. At the same time, it has a wide driving voltage range, simple circuit and low cost.

[0052] Please see Figure 1 The circuit mainly includes an upper bridge arm drive module, a lower bridge arm drive module, and a push rod. The upper bridge arm drive module includes a first MOSFET Q1 and a second MOSFET Q2; the lower bridge arm drive module includes a third transistor Q3 and a fourth transistor Q4. One end of the push rod is connected to the midpoint between the first MOSFET Q1 and the third transistor Q3, and the other end is connected to the midpoint between the second MOSFET Q2 and the fourth transistor Q4. The first MOSFET Q1 and the third transistor Q3, and the second MOSFET Q2 and the fourth transistor Q4 are connected in series between the drive power supply and GND, respectively. The extension and retraction of the push rod are controlled by controlling the conduction of the MOSFETs in the upper and lower bridge arm drive modules.

[0053] The circuit also includes an RC spike pulse absorption module, a topology circuit, and a pull-down resistor module.

[0054] First, the RC spike pulse absorption module in this embodiment will be explained in detail.

[0055] The RC spike pulse absorption module includes a first diode V1, a second diode V2, a third diode V3, a fourth diode V4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, and an eighteenth resistor R18; wherein:

[0056] The cathode of the first diode V1 is connected in series with the fifteenth resistor R15 and the first capacitor C1, and then connected in parallel to the first MOSFET Q1.

[0057] The cathode of the second diode V2 is connected in series with the sixteenth resistor R16 and the second capacitor C2, and then connected in parallel to the second MOSFET Q2.

[0058] The cathode of the third diode V3 is connected in series with the seventeenth resistor R17 and the third capacitor C3, and then connected in parallel to the fifth MOSFET Q5.

[0059] The cathode of the fourth diode V4 is connected in series with the eighteenth resistor R18 and the fourth capacitor C4, and then connected in parallel to the sixth MOSFET Q6.

[0060] The RC spike pulse absorption module is used to absorb the spike pulses generated by the MOSFET during rapid switching, thereby improving the electromagnetic compatibility of the circuit.

[0061] Next, the main description of the topology circuit in this embodiment will be given.

[0062] The first control signal port Ctrl_1_A1 controls the switching on and off of the fifth MOSFET Q5 through the topology circuit composed of the third transistor Q3, wherein:

[0063] The collector of the third transistor Q3 is connected to the gate of the fifth MOSFET Q5, and is connected to the power supply in series with the third resistor R3.

[0064] The base of the third transistor Q3 is connected in series with the seventh resistor R7 and then connected to the first control signal port Ctrl_1_A1.

[0065] The emitter of the third transistor Q3 is connected to GND.

[0066] The second control signal port Ctrl_1_B1 controls the on / off state of the sixth MOSFET Q6 through the topology circuit composed of the fourth transistor Q4, wherein:

[0067] The collector of the fourth transistor Q4 is connected to the gate of the sixth MOSFET Q6, and is connected to the power supply in series with the fourth resistor R4.

[0068] The base of the fourth transistor Q4 is connected in series with the eighth resistor R8 and then connected to the second control signal port Ctrl_1_B1.

[0069] The emitter of the fourth transistor Q4 is connected to GND.

[0070] The first control signal port Ctrl_1_A1 controls the on / off state of the first MOSFET Q1 through a topology circuit composed of the eighth transistor Q8, wherein:

[0071] The collector of the eighth transistor Q8 is connected in series with the fifth resistor R5 and then connected to the gate of the first MOSFET Q1. The fifth resistor R5 and the first resistor R1 are connected in series to the drive power supply.

[0072] The base of the eighth transistor Q8 is connected in series with the eleventh resistor R11 and then connected to the first control signal port Ctrl_1_A1.

[0073] The emitter of transistor Q8 is connected to GND.

[0074] The second control signal port Ctrl_1_B1 controls the on / off state of the second MOSFET through a topology circuit composed of the seventh transistor Q7, wherein:

[0075] The collector of the seventh transistor Q7 is connected in series with the sixth resistor R6 and then connected to the gate of the second MOSFET Q2. The sixth resistor R6 and the second resistor R2 are connected in series to the drive power supply.

[0076] The base of the seventh transistor Q7 is connected in series with the twelfth resistor R12 and then connected to the second control signal port Ctrl_1_B1.

[0077] The emitter of transistor Q7 is connected to GND.

[0078] The control signal controls the on / off state of the corresponding MOSFET through the topology circuit.

[0079] The voltage divider circuit, consisting of the first resistor R1 connected in series with the fifth resistor R5 and the second resistor R2 connected in series with the sixth resistor R6, increases the voltage range of the drive power supply, enabling it to drive various push rods and improving circuit adaptability.

[0080] Next, the pull-down resistor module in this embodiment will be described in detail.

[0081] The pull-down resistor module includes the thirteenth resistor R13, the fourteenth resistor R14, the nineteenth resistor R19, and the twentieth resistor R20, wherein:

[0082] The thirteenth resistor R13 is connected at one end to the base of the seventh transistor Q7 and at the other end to GND.

[0083] The fourteenth resistor R14 is connected at one end to the base of the eighth transistor Q8 and at the other end to GND.

[0084] The nineteenth resistor R19 is connected at one end to the base of the third transistor Q3 and at the other end to GND.

[0085] The twentieth resistor R20 is connected at one end to the base of the fourth transistor Q4 and at the other end to GND.

[0086] Pull-down resistor modules ensure that transistors are in a stable initial state, preventing them from malfunctioning due to interference signals and improving the electromagnetic compatibility of the circuit. At the same time, pull-down resistor modules enable transistors to quickly switch from the on state to the off state, accelerating the circuit's response speed.

[0087] In this embodiment, both the first MOS transistor Q1 and the second MOS transistor Q2 are P-type MOS transistors.

[0088] Both the third transistor Q3 and the fourth transistor Q4 are N-type transistors, eliminating the need for a bootstrap circuit and simplifying the MOSFET drive circuit.

[0089] The circuit principle of this embodiment is as follows:

[0090] When the first control signal port Ctrl_1_A1 is high and the second control signal port Ctrl_1_B1 is low, the first MOSFET Q1 and the sixth MOSFET Q6 are turned on, the second MOSFET Q2 and the fifth MOSFET Q5 are turned off, and the push rod extends.

[0091] When the first control signal port Ctrl_1_A1 is low and the second control signal port Ctrl_1_B1 is high, the first MOSFET Q1 and the sixth MOSFET Q6 are turned off, the second MOSFET Q2 and the fifth MOSFET Q5 are turned on, and the push rod is shortened.

[0092] When the control signal is abnormal:

[0093] When the first control signal port Ctrl_1_A1 and the second control signal port Ctrl_1_B1 are both high, the first MOSFET Q1 and the second MOSFET Q2 are turned on, and the fifth MOSFET Q5 and the sixth MOSFET Q6 are turned off. The push rod does not move, and the circuit will not experience a short circuit.

[0094] When the first control signal port Ctrl_1_A1 and the second control signal port Ctrl_1_B1 are both low, the first MOSFET Q1 and the second MOSFET Q2 are turned off, and the fifth MOSFET Q5 and the sixth MOSFET Q6 are turned on. The push rod does not move, and the circuit will not experience a short circuit.

[0095] This utility model also protects a three-proof closing mechanism, which includes the aforementioned push rod drive circuit. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A push rod drive circuit, applied to a three-proof closing mechanism, characterized in that, include: The upper bridge arm drive module includes a first MOSFET and a second MOSFET; The lower bridge arm drive module includes a third transistor and a fourth transistor; wherein the first MOSFET and the third transistor, and the second MOSFET and the fourth transistor are respectively connected in series between the drive power supply and GND; A push rod, one end of which is connected to the midpoint between the first MOSFET and the third transistor, and the other end of which is connected to the midpoint between the second MOSFET and the fourth transistor; the extension and retraction of the push rod is controlled by controlling the conduction of the MOSFETs in the upper bridge arm drive module and the lower bridge arm drive module.

2. The push rod driving circuit according to claim 1, characterized in that, It also includes an RC spike pulse absorption module, which comprises a first diode, a second diode, a third diode, a fourth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, and an eighteenth resistor, wherein: The cathode of the first diode is connected in series with the fifteenth resistor and the first capacitor, and then connected in parallel with the first MOS transistor. The cathode of the second diode is connected in series with the sixteenth resistor and the second capacitor, and then connected in parallel with the second MOS transistor. The cathode of the third diode is connected in series with the seventeenth resistor and the third capacitor, and then connected in parallel with the fifth MOS transistor. The cathode of the fourth diode is connected in series with the eighteenth resistor and the fourth capacitor, and then connected in parallel to the sixth MOS transistor.

3. The push rod driving circuit according to claim 2, characterized in that, It also includes a topology circuit, through which the control signal controls the on / off state of the corresponding MOS transistor.

4. The push rod driving circuit according to claim 3, characterized in that, The first control signal port controls the on / off state of the fifth MOS transistor through the topology circuit composed of the third transistor, wherein: The collector of the third transistor is connected to the gate of the fifth MOS transistor, and is connected to the power supply in series with a third resistor. The base of the third transistor is connected in series with a seventh resistor and then connected to the first control signal port. The emitter of the third transistor is connected to GND.

5. The push rod driving circuit according to claim 4, characterized in that, The second control signal port controls the on / off state of the sixth MOS transistor through the topology circuit composed of the fourth transistor, wherein: The collector of the fourth transistor is connected to the gate of the sixth MOS transistor, and is connected to the power supply in series with a fourth resistor. The base of the fourth transistor is connected in series with an eighth resistor and then connected to the second control signal port. The emitter of the fourth transistor is connected to GND.

6. The push rod driving circuit according to claim 5, characterized in that, The first control signal port controls the on / off state of the first MOS transistor through the topology circuit composed of the eighth transistor, wherein: The collector of the eighth transistor is connected in series with the fifth resistor and then connected to the gate of the first MOS transistor. The fifth resistor is connected in series with the first resistor and then connected to the driving power supply. The base of the eighth transistor is connected in series with the eleventh resistor and then connected to the first control signal port. The emitter of the eighth transistor is connected to GND.

7. The push rod driving circuit according to claim 6, characterized in that, The second control signal port controls the on / off state of the second MOS transistor through the topology circuit composed of the seventh transistor, wherein: The collector of the seventh transistor is connected in series with the sixth resistor and then connected to the gate of the second MOS transistor. The sixth resistor and the second resistor are connected in series to the driving power supply. The base of the seventh transistor is connected in series with the twelfth resistor and then connected to the second control signal port; The emitter of the seventh transistor is connected to GND.

8. The push rod driving circuit according to claim 7, characterized in that, The circuit also includes a pull-down resistor module, which comprises a thirteenth resistor, a fourteenth resistor, a nineteenth resistor, and a twentieth resistor, wherein: One end of the thirteenth resistor is connected to the base of the seventh transistor, and the other end is connected to GND; One end of the fourteenth resistor is connected to the base of the eighth transistor, and the other end is connected to GND; One end of the nineteenth resistor is connected to the base of the third transistor, and the other end is connected to GND; One end of the twentieth resistor is connected to the base of the fourth transistor, and the other end is connected to GND.

9. The push rod driving circuit according to claim 1, characterized in that, The first MOSFET and the second MOSFET are both P-type MOSFETs; the third MOSFET and the fourth MOSFET are both N-type MOSFETs.

10. A three-proof closing mechanism, characterized in that, Includes the push rod drive circuit as described in any one of claims 1-9.

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