CN-122026772-A - Push rod limiting circuit, push rod limiting method, push rod device and aerostat

CN122026772ACN 122026772 ACN122026772 ACN 122026772ACN-122026772-A

Abstract

The application discloses a push rod limiting circuit, a push rod limiting method, a push rod device and an aerostat, which relate to the technical field of push rod limiting, wherein a first solid-state relay and a second solid-state relay of a solid-state relay control module are respectively provided with a control end and a controlled passage, a first limit switch of a limit switch module is connected in series in a loop of a rectifying power supply module and the control end of the first solid-state relay, a second limit switch is connected in series in a loop of the rectifying power supply module and the control end of the second solid-state relay, a PWM driving module is used for receiving PWM power supply and selectively supplying power to a push rod motor through the controlled passages of the first solid-state relay and the second solid-state relay so as to control forward and reverse rotation and speed regulation of the push rod motor, the push rod limiting circuit is used for combining PWM speed regulation through non-contact switching of the solid-state relay, the power supply of the motor is simultaneously avoided in a limit position, contact oxidation and electromagnetic interference, and long service life and high reliability limit under a severe high-altitude environment are realized.

Inventors

ZHAO HENGHUI
TANG GANG
LI XIN

Assignees

河南中原空天创新科技有限公司

Dates

Publication Date: 20260512
Application Date: 20251204

Claims (10)

1. A push rod limit circuit, comprising: The rectification power supply module is used for receiving an input power supply, rectifying and stabilizing the voltage and outputting stable direct-current working voltage; The solid-state relay control module is connected with the rectification power supply module and comprises a first solid-state relay and a second solid-state relay, the first solid-state relay and the second solid-state relay are respectively provided with a control end and a controlled passage, the control ends are powered by the rectification power supply module, and the on-off of the control ends are used for controlling the on-off of the controlled passages; The limit switch module is connected with the rectification power supply module and the solid-state relay control module and comprises a first limit switch and a second limit switch, the first limit switch is connected in series in a loop of the rectification power supply module and a control end of the first solid-state relay, and the second limit switch is connected in series in a loop of the rectification power supply module and a control end of the second solid-state relay; The PWM driving module is connected with the PWM power supply driver, the push rod motor and the solid state relay control module, and is used for receiving PWM power supply and selectively supplying power to the push rod motor through controlled paths of the first solid state relay and the second solid state relay so as to control forward and reverse rotation and speed regulation of the push rod motor; when the push rod moves to trigger the first limit switch or the second limit switch to be disconnected, the control end of the corresponding solid state relay is powered off, and the controlled passage of the corresponding solid state relay is switched off, so that a power supply loop of the push rod motor is cut off to realize limit.
2. The push rod limiting circuit of claim 1, wherein the rectified power module comprises: The input end of the rectifier bridge is connected with the input power supply; the cathode of the voltage-stabilizing diode is connected with the positive output end of the rectifier bridge, and the anode of the voltage-stabilizing diode is connected with the negative output end of the rectifier bridge; And the first end of the first filter capacitor is connected with the positive output end of the rectifier bridge, and the second end of the first filter capacitor is connected with the negative output end of the rectifier bridge.
3. The push rod limiting circuit of claim 2, wherein the rectified power module further comprises: The second filter capacitor is arranged in parallel with the first filter capacitor; and the anode of the power supply indicating unit is connected with the positive output end of the rectifier bridge, and the cathode of the power supply indicating unit is connected with the negative output end of the rectifier bridge.
4. The push rod limiting circuit of claim 1, wherein the first solid state relay and the second solid state relay are optocoupler isolated MOSFET solid state relays, the control terminals of which are light emitting diodes, and the controlled paths of which are MOSFET switches.
5. The push rod limiting circuit of claim 1, wherein the first limit switch and the second limit switch in the limit switch module are both normally closed mechanical micro-switches.
6. The push rod limiting circuit of claim 5, wherein the limit switch module further comprises: The first current limiting resistor is connected in series between the rectifying power supply module and the first limit switch; the second current limiting resistor is connected in series between the rectifying power supply module and the second limit switch.
7. The push rod limiting circuit of claim 1, wherein the PWM drive module comprises: The anode of the first follow current diode is connected with the first input end of the push rod motor, and the cathode of the first follow current diode is connected with the high potential end of the controlled path of the first solid state relay; And the anode of the second follow current diode is connected with the second input end of the push rod motor, and the cathode of the second follow current diode is connected with the high potential end of the controlled path of the second solid state relay.
8. A push rod limiting method, characterized in that it is implemented based on the push rod limiting circuit according to any one of claims 1 to 7, comprising: converting an input power supply into a stable direct-current working voltage through the rectifying power supply module; when the push rod does not reach the limit position, the limit switch module maintains the conduction of the corresponding solid state relay control end in the solid state relay control module; receiving PWM power supply through the PWM driving module, and driving the push rod motor to move through a controlled passage of the solid state relay which is conducted; When the push rod moves to the limit position, the corresponding limit switch is triggered to be disconnected, the power supply of the control end of the corresponding solid state relay is cut off, the controlled passage of the corresponding solid state relay is turned off, and the push rod motor is stopped.
9. A push rod device, which comprises a push rod, characterized by comprising the following steps: The push rod mechanism is provided with a push rod motor and a push rod driven by the push rod motor; a push rod limit circuit according to any one of claims 1 to 8; The PWM driving module is connected with the push rod motor, and the first limit switch and the second limit switch are respectively arranged at the extending limit position and the retracting limit position of the push rod mechanism and used for generating limit signals when the push rod is triggered.
10. An aerostat comprising a push rod device according to claim 9.

Description

Push rod limiting circuit, push rod limiting method, push rod device and aerostat Technical Field The application relates to the technical field of push rod limiting, in particular to a push rod limiting circuit, a push rod limiting method, a push rod device and an aerostat. Background The push rod mechanism is widely applied to occasions needing linear expansion such as aerostat control surfaces, landing gears, cabin doors and the like, and the limit position protection of the push rod mechanism depends on a limit switch circuit. The traditional scheme comprises three forms of mechanical contact direct control, relay isolation driving and Hall sensorless, and motor outage is realized through impact disconnection, relay contact switching or magnetic field induction respectively, so that the requirements of stopping and reversing are met. Under the working conditions of high-altitude low-temperature, low-pressure and strong electromagnetic aerostat, mechanical contacts are easy to adhere and wear, a relay is not resistant to PWM speed regulation and contact oxidation acceleration, and a Hall element is limited and misaligned due to temperature drift and electromagnetic interference, so that single reliable limiting requirements of long service life, high precision and PWM compatibility cannot be met at the same time. Disclosure of Invention The application aims to provide a push rod limiting circuit, which combines the contactless switching of a solid-state relay with PWM speed regulation, instantly cuts off the power supply of a motor at a limiting position, simultaneously avoids mechanical abrasion, contact oxidation and electromagnetic interference, and realizes long service life and high-reliability limiting in a high-altitude severe environment. Another object of the present application is to provide a push rod limiting method, a push rod device and an aerostat. In order to achieve the above object, the present application provides a push rod limiting circuit, comprising: The rectification power supply module is used for receiving an input power supply, rectifying and stabilizing the voltage and outputting stable direct-current working voltage; The solid-state relay control module is connected with the rectification power supply module and comprises a first solid-state relay and a second solid-state relay, the first solid-state relay and the second solid-state relay are respectively provided with a control end and a controlled passage, the control ends are powered by the rectification power supply module, and the on-off of the control ends are used for controlling the on-off of the controlled passages; The limit switch module is connected with the rectification power supply module and the solid-state relay control module and comprises a first limit switch and a second limit switch, the first limit switch is connected in series in a loop of the rectification power supply module and a control end of the first solid-state relay, and the second limit switch is connected in series in a loop of the rectification power supply module and a control end of the second solid-state relay; The PWM driving module is connected with the PWM power supply driver, the push rod motor and the solid state relay control module, and is used for receiving PWM power supply and selectively supplying power to the push rod motor through controlled paths of the first solid state relay and the second solid state relay so as to control forward and reverse rotation and speed regulation of the push rod motor; when the push rod moves to trigger the first limit switch or the second limit switch to be disconnected, the control end of the corresponding solid state relay is powered off, and the controlled passage of the corresponding solid state relay is switched off, so that a power supply loop of the push rod motor is cut off to realize limit. In some embodiments, the rectified power module includes: The input end of the rectifier bridge is connected with the input power supply; the cathode of the voltage-stabilizing diode is connected with the positive output end of the rectifier bridge, and the anode of the voltage-stabilizing diode is connected with the negative output end of the rectifier bridge; And the first end of the first filter capacitor is connected with the positive output end of the rectifier bridge, and the second end of the first filter capacitor is connected with the negative output end of the rectifier bridge. In some embodiments, the rectified power module further comprises: The second filter capacitor is arranged in parallel with the first filter capacitor; and the anode of the power supply indicating unit is connected with the positive output end of the rectifier bridge, and the cathode of the power supply indicating unit is connected with the negative output end of the rectifier bridge. In some embodiments, the first solid state relay and the second solid state relay are optocoupler isolation type MOSFET solid state rel