JPS5854754B2 - Chiyotupa type braking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chopper braking device that uses both regenerative braking and dynamic braking.

FIG. 1 shows the circuit of this type of chopper braking device.

In the figure, 1 is a pantograph as a current collector, 2 is a current breaker, 3 is a filter reactor for removing the pulsating flow of regenerative current, 4 is a diode for blocking backflow, 5 is an overhead contact line, and 6 is a pulsating current of regenerative current. 7 is the main smoothing reactor, 8 is the armature of the DC motor, 9 is its series field, 1
0 is a chopper, 11 is a dynamic braking resistor that short-circuits the main motor circuit, and 12 is a resistance switch that connects this resistor 11 in parallel to the main motor.

2 is a control circuit that controls the current interrupter 2 and switch 12 shown in FIG. 1, and 21 is the filter capacitor 6 shown in FIG.
22 is a reference voltage generator, 23 is a comparator that compares the detected value of the voltage detector 21 with the reference voltage of the generator 22, and 24 is a voltage detector that detects the terminal voltage of the switch 12.
The circuit closing controller 25 is a controller that opens and closes the circuit breaker 2 .

In such a configuration, when the chopper 10 performs regenerative braking operation while repeatedly turning on and off, when the load that was absorbing the regenerative current is removed, the regenerative current flows into the filter capacitor 6 and the filter capacitor 6 is Voltage increases.

In FIG. 2, when the voltage of the filter capacitor 6 increases and the output voltage of the voltage detector 21 rises to the reference voltage level of the reference voltage generator 22, an output is generated from the comparator 23, which closes the resistor switch 12. An output of is generated in the resistance switch controller 24, an output for opening the current interrupter 2 is generated in the current interrupter controller 25, and the resistor 11 is connected to the main motor circuit.

Therefore, if the value of the resistor 11 is appropriately selected, regenerative braking can be directly shifted to dynamic braking.

Next, when a regenerative load is connected to the overhead contact line 5 due to other vehicles driving in the opposite direction, the voltage of the filter capacitor 6 decreases.
When the output of the comparator 23 disappears, the current interrupter 2 is closed and the switch 12 is opened so that regenerative braking is resumed.

However, even if the switch 12 is opened, the dynamic braking current is blocked by the filter reactor 3, flows into the filter capacitor 6, its voltage rises, and the current breaks through the current interrupter 3 again.
to open.

While repeating such an operation several times until the current in the filter reactor 3 increases, the dynamic braking is gradually shifted to the regenerative braking.

When the flow interrupter 2 repeats closing and opening in this way, there are drawbacks such as increased mechanical wear and tear on the flow interrupter 2 and further deterioration of riding comfort.

The present invention provides a difference between the voltage level of the filter capacitor, which closes the resistance switch, and the voltage level, which opens the current breaker, to close and open the current breaker when transitioning from dynamic braking to regenerative braking. To provide a chopper-type braking device that eliminates repetitive operations, reduces mechanical wear and tear on flow breakers, and improves riding comfort.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 shows an embodiment of the control circuit for the chopper type braking device according to the present invention, in which 22-1 and 22-2 are reference voltage generators, 23-1 and 23-2 are comparators, and 26-1 and 22-2 are reference voltage generators, respectively. is memory.

Other symbols are the same as those in FIG. In such a configuration, when shifting to dynamic braking due to the removal of regenerative load, the output of the filter capacitor voltage detector 21 and the reference voltage generators 22-1 and 22-2 are connected as in the conventional case. and comparators 23-1 and 23-
As a result, an output for turning on the resistance switch 12 is generated in the resistance switch controller 24, an output for opening the current interrupter 2 is generated in the current interrupter controller 25, and a resistance is applied to the main electric circuit. device 11 is connected.

At this time, the output that opens the current circuit breaker 2 is stored in the memory 26, and the output voltage increases the output voltage of the reference voltage generator 22, increasing the voltage level when the current circuit breaker 2 opens.

This high voltage level is maintained even when the filter capacitor voltage decreases and there is a transition to regenerative braking due to the reappearance of the regenerative load.

When the regenerative load appears, the disconnector 2 is closed, and the switch 12
When the filter capacitor voltage is opened, the filter capacitor voltage rises to the voltage at which the switch 12 is closed again.

However, since the voltage level that produces the output that opens the current breaker 2 is set higher than the voltage level that produces the output that closes the switch 12, the current breaker 2 is not opened, and the switch 12 is closed and closed. Shift to regenerative braking while repeatedly releasing the brake.

Since this switch 12 is an electric control valve such as Cyrisk, it is possible to shift to regenerative braking without repeating closing and opening operations as in the conventional case.

FIG. 4 shows another embodiment of the control circuit for the braking device according to the present invention, and the difference from the embodiment shown in FIG.
The output from 3-2 that opens the current interrupter 2 is stored in the memory 26, and the output is applied to the reference voltage generator 22-1 to generate a reference voltage level that produces an output that closes the switch 12 for a certain period of time. This is because I decided to lower it.

As described above, according to the present invention, when transitioning from dynamic braking to regenerative braking, only the resistance switch is closed and opened, thereby eliminating the repeated closing and opening operations of the current interrupter. It can reduce mechanical wear and tear and improve riding comfort.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the main circuit of a chopper type braking device, Fig. 2 is a block diagram of a control circuit of a conventional chopper type braking device, and Fig. 3 is a block diagram of a control circuit of a conventional chopper type braking device.
4 and 4 respectively show a configuration diagram of an embodiment of a control circuit for a chopper type braking device according to the present invention. 2... Insulator, 6... Filter capacitor, 8... Armature, 10... Chopper, 11... Generating resistor, 12... Resistance switch, 21... Voltage detector, 22-1.
22-2...Reference voltage generator, 23-1, 23
-2... Comparator, 24... Switch controller, 25... Breaker controller, 26...
·memory.

Claims (1)

[Claims] 1. A main motor circuit including a motor and a chopper, a current breaker for separating the main motor circuit from the overhead contact line, a filter circuit connected in parallel with the main motor circuit, and a resistor for short-circuiting the main motor circuit. and a switch for connecting the resistor to the main motor circuit, a detection means for detecting a voltage of the filter circuit applied to the main motor circuit, and a power supply voltage detected by the detection means. control means for closing the switch when exceeds a first reference voltage; and control means for opening the current breaker when the power supply voltage detected by the detection means exceeds a second reference voltage. . A chopper type braking device comprising: means for making the second reference voltage higher than the first reference voltage for a certain period of time when the power supply voltage exceeds the second reference voltage.