Damping circuit for power-off self-resetting electric end door

Abstract

The utility model discloses a damping circuit for a power-off self-resetting electric end door, which comprises a power supply unit, a motor driving unit, a damping unit and a motor, and is characterized in that the power supply unit is used for converting external input voltage into working voltage of the motor driving unit, the damping unit and a driving motor; the motor driving unit applies pulse voltage to the motor, drives the motor to rotate and drives the train end door to move; the damping unit is used for controlling the rotating speed of the motor. The utility model has the advantages of strong anti-interference capability, good stability, high reliability, strong durability, wide application environment and the like, and has a good market prospect.

Description

Technical Field

[0001] The utility model relates to a damping circuit for a power-off self-resetting electric end door. Background Art

[0002] In recent years, with the rapid advancement of science and technology, automation technology has been widely applied in various fields. Urban rail transit has kept pace with the times, continuously innovating track manufacturing technology, resulting in the emergence of a new generation of intelligent intercity EMUs. These new generation intelligent intercity EMUs are composed of multiple carriages, each with external doors at the junction. These doors not only serve to divert traffic and isolate noise from other carriages, but also quickly close in the event of a fire or other dangerous situation, preventing the spread of fire and protecting passengers and drivers. The train's external doors must not only open and close normally when powered on, but also quickly and automatically close when the door control device loses power in the event of a fire. This closing motion must occur at a low speed, ensuring that the external doors fully close to prevent the spread of fire, while also preventing passengers from being squeezed during closing and remaining easily openable. Currently, existing door control devices on the market do not meet these requirements for electric external doors in terms of motor control. Therefore, a damping circuit for self-resetting electric external doors in the event of a power failure is needed. Summary of the Invention

[0003] The utility model aims to solve the problems existing in the prior art and provides a damping circuit for a power-off self-resetting electric end door.

[0004] The technical solutions adopted in this utility model are:

[0005] A damping circuit for a power-off self-resetting electric end door comprises a power supply unit, a motor drive unit, a damping unit and a motor. The power supply unit is used to convert an external input voltage into an operating voltage for the motor drive unit, the damping unit and the drive motor; the motor drive unit applies a pulse voltage to the motor to drive the motor to rotate and drive the train end door to move; the damping unit is used to control the speed of the motor.

[0006] Furthermore, the damping unit includes a relay, the two ends of the coil of the relay are connected to 24V+ and GND respectively, and the common end and the normally closed contact of the relay are connected to any two phases of the three phases of the motor MA, MB, and MC.

[0007] Furthermore, the relay adopts a single-pole double-throw power relay with an operating voltage of 24V.

[0008] Furthermore, a resistor R276 is connected in series at the common terminal of the relay.

[0009] The utility model has the following beneficial effects:

[0010] The utility model has the advantages of strong anti-interference ability, good stability, high reliability, strong durability, wide application environment, etc., and has good market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a principle block diagram of the utility model.

[0012] Figure 2 This is part of the door control device motor control circuit.

[0013] Figure 3 For the power supply unit circuit. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] like Figures 1 to 3 The utility model discloses a damping circuit for electric end doors that resets automatically when power is cut off, comprising a power supply unit, a motor drive unit, a damping unit and a motor. The power supply unit converts the external input voltage into the operating voltage of the motor drive unit, the damping unit and other units of the door control device. The motor drive unit applies a pulse voltage to the motor by receiving the control instruction of the control processing unit, drives the motor to rotate and thus drives the end door of the train to move. The motor drive unit mainly realizes the opening and closing of the end door by adjusting the speed and direction of the motor. The speed of the motor is determined by the number of pulses received by the motor drive unit. The more pulses per unit time, the faster the speed; the commutation rotation of the motor is caused by the motor drive unit changing the order of applying pulses to the winding phases of the motor, thereby changing the direction of the motor.

[0016] The damping unit controls the motor speed. When the door control system loses power, the electric end door automatically resets and closes. The damping unit controls the motor speed, keeping it rotating at a low speed, allowing the electric end door to close slowly. When the door control system is powered on and operating normally, the motor speed is controlled by the motor drive unit, and the damping unit is inactive, having no effect on the motor.

[0017] During use, the door control device controls the brushless DC motor via a belt drive, thereby driving the door. This, in conjunction with the mechanical door closer installed on the mechanism, enables the exterior door to open, close, hold, and automatically close upon power failure. The door control device is not protected by this patent, and therefore, the door control device (i.e., the motion actuator) is not described in detail.

[0018] The circuit diagram of the door control device motor control circuit is as follows Figure 2As shown, the main components are the motor drive unit and the damping unit. The damping unit primarily includes 24V+, GND, RLY1, MC, MA, and R276. The 24V voltage serves as both the coil operating voltage and the motor operating voltage, ensuring a quick response from the motor damping unit after a power outage. The relay coil is connected to 24V+ and GND, respectively. The relay's normally closed contact is connected to the motor's MC phase, and the relay's common terminal is connected to the motor's MA phase via a series resistor R276. (The relay's common terminal and normally closed contact can be connected to any two phases of the motor.) When the door control device is connected to power, the power supply unit converts the input voltage into 24V and directly powers the relay coil. When the relay coil is energized, the relay's normally closed contact releases, disconnecting the motor's MA and MC phases from their short-circuited state. The door control device then sends a pulse signal to the motor drive unit, driving the motor to rotate normally.

[0019] When the door control device loses power, the 24V voltage on the relay coil disappears, closing the normally closed contacts of the relay and short-circuiting the motor phases MA and MC. At this point, when the door is open, the door closer pulls the door to automatically close. During this closing process, the door should accelerate. However, the movement of the door drives the motor through the belt. This motor's rotation acts as a generator, generating voltage across the motor's three-phase terminals. Since the relay short-circuits phases MA and MC, forward conduction occurs. The induced voltage generated by the motor is dissipated by the relay's series resistor R276, creating a damping effect on the motor. This damping effect slows the door's acceleration. Because the door closer's pulling force on the door gradually decreases, the motor's damping effect causes the door to slow down and buffer its movement, eventually closing slowly. The damping effect of the motor depends on the resistance of resistor R276. A larger value results in less damping, while a smaller value results in greater damping.

[0020] The above-mentioned motor damping process belongs to the energy consumption braking method of the motor, but compared with the traditional energy consumption braking, the motor damping circuit structure invented by the utility model is simple, the price of electrical components is relatively low, and it has extremely strong stability and durability. The simple circuit structure and electrical components can greatly reduce production costs and have extremely high cost-effectiveness advantages.

[0021] Using 24V+ voltage instead of 24V_P voltage to power the relay coil allows the relay's normally closed contacts to open first when the door control device is powered on, and to close first when the door control device is powered off. Although a switching transistor can be used to control the relay on and off, using direct power supply control offers faster response than using a switching transistor, and its simple structure ensures circuit reliability.

[0022] In actual applications, relay RLY1 is specifically model JZC-32F / 024-ZS3(555), which has a strong current switching capability, with both actuation and release times within 10ms, demonstrating a fast response. Resistor R276 is a 2.7Ω cement resistor with high power, capable of carrying high currents and protecting the damping circuit from burnout.

[0023] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention.

Claims

1. A damping circuit for a power-off self-reset electric end door, characterized in that: It includes a power supply unit, a motor drive unit, a damping unit and a motor. The power supply unit is used to convert the external input voltage into the working voltage of the motor drive unit, the damping unit and the drive motor; the motor drive unit applies a pulse voltage to the motor to drive the motor to rotate and drive the train end door to move; the damping unit is used to control the speed of the motor.

2. The damping circuit for a power-off self-reset electric end door according to claim 1, characterized in that: The damping unit includes a relay, the two ends of the coil of the relay are connected to 24V+ and GND respectively, and the common end and the normally closed contact of the relay are connected to any two phases of the three phases MA, MB and MC of the motor.

3. The damping circuit for a power-off self-resetting electric end door according to claim 2, characterized in that: The relay is a single-pole double-throw power relay with an operating voltage of 24V.

4. The damping circuit for a power-off self-resetting electric end door according to claim 3, characterized in that: Connect resistor R276 in series at the common terminal of the relay.

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