JPS6036963Y2 - High-speed shield disconnection automatic reset device for AC electric vehicles - Google Patents

Description

[Detailed description of the invention] The present invention relates to an automatic reset device for a high-speed breaker in a control device for an AC electric vehicle, particularly in a control device that uses three-phase AC as a power source and drives a DC motor using a thyristor Leonard device. It is.

High-speed circuit breakers for vehicles (hereinafter referred to as HB) close the contacts using pneumatic force, hold them using electromagnetic force, and when a large current flows through the tripping coil, the holding magnetic flux is reduced and the spring force causes a strong tripping operation. A structure that allows this to occur is generally used.

The operation of closing the contact point with pneumatic force and holding it with electromagnetic force is called a reset. Conventionally, automatic reset devices for HB automatically reset the contact once when the control device's control power is established when the vehicle leaves the garage. There are known circuits that do just that.

Figure 1 is a circuit diagram of a conventional automatic reset device. When the control power supply E is pressurized with the previous air pressure established and the air pressure switch contact 1 closed, the timer circuit 2 is activated. HB via the b contact 5 of the auxiliary relay.
The return wire F is energized through the coil 7 of the closing solenoid valve, and the coil 7 of the solenoid valve is energized, so air enters the air cylinder of HB and the old contact is closed and closed.

Although not shown, an electromagnetic coil that provides a holding magnetic flux is energized as the air cylinder operates, and even if the air pressure in the air cylinder disappears, a holding magnetic flux is generated that overcomes the spring force of the new moon and holds the contact, and the electromagnetic coil The current is self-maintained.

On the other hand, since the timer circuit 2 outputs an output after a predetermined period of time has elapsed, the auxiliary relay coil 3 is energized and the auxiliary relay B
The self-holding circuit opens the contact 5, demagnetizes the coil 7 of the closing solenoid valve, removes the air pressure of the air cylinder for closing the contact, and energizes the coil 3 of the auxiliary relay via the a contact 4 of the auxiliary relay. Form.

The automatic reset operation is thus completed, but once the auxiliary relay's self-holding circuit is formed, it continues to hold it until the control power is turned off, so the HB is automatically reset only once when the control power is turned on. That will happen.

This type of device was designed to omit the HB reset operation that was conventionally performed by the driver when the vehicle leaves the garage, and is completely useless in the event that the HB trips while driving. In this case, the driver can reset the HB at his discretion by operating a manual switch (not shown) and sending a reset signal to the solenoid valve coil 7 via the backflow prevention diode 6. Ta.

However, unmanned operation is a prerequisite for new transportation system vehicles that have been developed in recent years and are being put into practical use. In some cases, in addition to failure of the control device, the old device may trip due to an overhead line voltage outage or disconnection of the current collector, and in order to be unmanned, it is necessary to automate the reset operation at this time.

The present invention has been made in accordance with such requirements, and one embodiment will be explained below with reference to the drawings.

FIG. 2 is a circuit diagram showing the configuration of the HB automatic reset device according to the present invention. HB13 incorporates the conventional automatic reset device shown in FIG. 1 as is, and the same reference numerals as in FIG. Indicates parts that have the same function.

The part surrounded by the dashed line in the figure is the old automatic reset device 16 according to the present invention, which includes the first and second AND circuits 9 and 11, the memory device 10, and the timer circuit 12.
It is composed of.

While the main controller 15 outputs the brake command signal A and the vehicle is decelerating, the HB 13 trips and a signal B indicating that the HB is tripped is output, and furthermore, due to a power outage or a current collector. When the device 8 that detects a drop in overhead wire voltage due to wire separation etc. outputs a detection output signal G,
That is, when the first AND circuit 9 receives these three signals A, B, and G at the same time, the first AND circuit 9 outputs an output, and the memory device 10 is set.

The output of the memory device 10 is a signal having the property of an HB reset request and is connected to the second AND circuit 11, and when the vehicle decelerates sufficiently, the stop detection device 14 that detects the stopped state of the vehicle outputs a stop detection signal C. Therefore, the second AND circuit 11
When the conditions are met, the HB reset signal is generated as an output.

This reset signal is transmitted to the timer circuit 12 and the HB 13 to perform a reset operation, and after a certain period of time has elapsed, the memory device 10 is reset by the output of the timer circuit 12.

When the memory device 10 is reset, the second AND circuit 1
Since the condition 1 no longer holds true, the reset signal for the HB 13 disappears and remains in that state until the next condition for the first AND circuit 9 is met.

It is well known that when the external power supply of the thyristor Leonard device during inversion disappears, a so-called commutation failure phenomenon occurs and a short circuit is formed on the DC side, tripping the HB inserted in the DC circuit.

Since this is considered to be a normal operation and not a failure of the control device, there is no problem even if the old trip under such circumstances is immediately reset.

The high-speed breaker automatic reset device for an AC electric vehicle according to the present invention accurately grasps the above-mentioned situation using the first AND circuit 9, and automatically resets the circuit breaker after the vehicle has stopped. This device is extremely effective as a device for resetting the HB of an unmanned vehicle because it does not require any operation by the driver, and the signal equipment and other components that make up the device can be easily configured using only on-vehicle devices.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional automatic reset device, and FIG. 2 is a circuit diagram showing the configuration of a high-speed breaker automatic reset device according to the present invention. 1...Contact point of air pressure switch, 2.12...
...Timer circuit, 3...Auxiliary relay coil, 4...Auxiliary relay a contact, 5...
B contact of auxiliary relay, 6... Backflow prevention diode, 7... Coil of solenoid valve, Death... Device for detecting drop in overhead line voltage, 9... ...First AND circuit, 10...Memory device, 11...
...Second AND circuit, 13...Vehicle high-speed breaker, 14...Stop detection device, 15...
...Main controller, 16...Automatic reset device.

Claims (1)

[Scope of utility model registration request] In AC electric cars, the vehicle is driven by a DC motor combined with a thyristor Leonard device whose power source is three-phase alternating current supplied from the overhead wire, and the braking force of the vehicle is obtained using the inverse conversion of the thyristor Leonard device. A first AND circuit that receives the detection signal of the device that detects the voltage drop, the control command signal, and the signal indicating that the high-speed breaker is tripped; and the output of the AND circuit. A memory device that is reset after a certain period of time has passed after the reset signal of the high-speed breaker which is the output of this device is set, and the output signal of the memory device and the vehicle speed are stopped to indicate that the vehicle speed has decreased sufficiently. A high-speed breaker for an AC electric vehicle, comprising a second AND circuit that receives two detection signals as input, and an output of the second AND circuit is used as a reset signal for the high-speed breaker. Automatic reset device.