JPS60128803A - Controller for electric railcar - Google Patents

Abstract

PURPOSE:To prevent a brake series resistor from overheating or burning out by forcibly opening a main circuit when the fact that a malfunction occurs in the output of the final stage of a frequency divider is detected. CONSTITUTION:A frequency signal 16 outputted from a frequency divider 15 is used to decide the widths of the ON and OFF pulses of a chopper 12. A frequency signal 17 corresponds to a repetition control frequency for the chopper 12, and a frequency signal 18 is used to control a shortcircuit switch 11 of a brake series resistor 10. If the oscillation of the divider 15 is stopped, the oscillation of the signal 18 of the output from the final stage is stopped. Accordingly, a coil of a control relay 28 is demagnetized. Thus, a solenoid valve 30 is demagnetized to turn the corresponding switch 3 OFF, and a main circuit of a chopper controller is opened.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an electric vehicle control device, and in particular, it divides a reference frequency signal generated from an oscillation circuit using a crystal oscillator or the like into multiple channels. The present invention relates to an electric vehicle control device that generates frequency signals of 1 and uses these frequency signals as reference signals for controlling the gate pulse width of a thyristor and controlling the time of a time limit circuit.

[Prior art]

FIG. 1 shows a chopper control device as a typical conventional example of this type of control device. In FIG. 1, 1 is an overhead contact line, C is a panda graph, and 3 is a switch for connecting and disconnecting the chopper main circuit, which will be described later, to the electric train i1m/. Hiro is a filter reactor! is a filter capacitor, and these two constitute an LC type filter circuit, which is connected between the switch 3 and the ground. 6 is a blocking diode,
is the main smoothing reactor. A is a series-wound field winding, and D is an armature, and these two constitute a DC series-wound motor M. 10 is a brake series resistor, and l/ is a switch for short-circuiting this. And 1.2 is a chopper, and the kneading is the main smoothing reactor torque, the direct winding field winding #! t and armature t are connected in parallel to a series circuit consisting of a DC series-wound motor M and a brake series resistor /θ. The filter reactor or the means of the chopper 12 constitute the main circuit of the chopper control device. Further, /3 is an oscillation circuit using a crystal oscillator, and the output of this is a reference frequency signal /da, which is applied to the frequency dividing circuit /3 and subjected to a predetermined frequency dividing operation.
A frequency signal /6, a first frequency signal /7, and a third frequency signal /& are generated. Note that this third frequency signal 7g is the final stage output of the frequency divider circuit /j. 1st
The frequency signal /6 is applied to an electric current which determines the width of the on- and off-pulses of the chopper 7.2. The first frequency signal /7 corresponds to the repetition control frequency for the chopper [,2. The third frequency signal /& is a short circuit switch / for the brake series resistor 10.
This is to create the time limit necessary to control /. First frequency signal/6 and first frequency signal/
is applied to the gate pulse generation circuit/9, and based on the conduction rate output of the current control system (not shown in the figure),
On-pulse 2 and off-pulse are created by the - number of frequency signals. These on-pulses and off-pulses 7t are applied to the chopper/-1 via the amplifier 2O. 2/ is a chopper frequency abnormality detection circuit, and this circuit smoothes the first frequency signal corresponding to the repetition control frequency for chopper/2 to DC, and detects when the value is less than half of the normal value. If the first frequency signal is equal to or more than 1, the first frequency signal is determined to be abnormal, and the main circuit of the chopper control device is opened to prevent abnormal operation from occurring.

Further, 22 is a circuit for forcibly turning on the brake series resistor/θ short-circuit switch//, and this circuit is configured to issue a brake command based on the third frequency signal/. The output is output after a predetermined period of time has elapsed. In addition, 23.

is a detector for detecting the voltage, current value, etc. of the motor under predetermined conditions.

In such a conventional chopper control device, assuming that the regenerative braking is currently in progress, the brake series resistor /θ is connected in series with the electric motor M to expand the regenerative range at high speeds, Full regenerative braking is applied. When the speed of the electric vehicle decreases due to brake control, the detector 23 detects that the relationship between the voltage and current of the electric motor M in the main circuit and the voltage of the filter capacitor S has reached a predetermined set value. This brake series resistor 10 is short-circuited by the short-circuit switch /'/. By the way, this brake series resistor lθ is necessary only in the high-speed range where regenerative braking is applied, so if detector 3 fails or there is a mistake in the set value, the short-circuit switch // is not operated, and the brake series resistor IO is no longer short-circuited, overheating or burning out,
This can lead to a very dangerous situation. For this purpose, a circuit 22 is provided to forcibly turn on the short-circuit switch //.
When a predetermined time has elapsed after the brake command is issued, the short circuit switch // is forcibly operated to prevent overheating and burnout of the brake series resistor /l. By the way, in this type of conventional chopper control device, the repetitive control frequency itself for the chopper, that is, the first frequency signal, is monitored by the chopper frequency abnormality detection circuit (da)1/, and the control frequency itself for the chopper is monitored by the chopper frequency abnormality detection circuit (da)1/, and the repeat control frequency for the chopper is monitored by the chopper frequency abnormality detection circuit (da)1/. When an abnormal situation occurs, a protective operation is performed to detect this and turn off the main circuit of the chopper control device. Therefore, if an abnormal situation such as stopping oscillation occurs in the frequency divider circuit /S at the stage before the output stage of the second frequency signal /7, the chop (frequency abnormality detection circuit 2/ Although it is possible to detect this and perform a predetermined protective operation, it is possible to detect this when an abnormal situation occurs in the frequency dividing circuit at a stage subsequent to the output stage of the first frequency signal /7. This may make it impossible to forcibly turn on the short-circuit switch for the brake series resistor/θ, and the two circuits that forcibly turn on the short-circuit switch for the brake series resistor/θ may not operate normally. The drawback is that overheating or burnout cannot be prevented.

[Summary of the invention]

This invention was invented in order to eliminate the drawbacks of the conventional device as described above, and its purpose is to
In an electric vehicle control device that divides a reference frequency to create a plurality of frequency signals and controls a main circuit of a chopper control device based on these frequency signals, the final stage output of the frequency dividing circuit It is an object of the present invention to provide a device that is provided with means for forcibly opening the main circuit when an abnormality is detected in the main circuit.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described with reference to FIG.

In FIG. 2, the components given the same symbols as those in FIG. 1 perform the same functions, so their explanations will be omitted. The third frequency signal from the frequency dividing circuit 15 is branched and applied to the drive circuit 2 of the transistor 2S.

The seventh side of the transformer λ6 enters the collector side of the transistor 2S, and the secondary side thereof is connected to the coil of the control relay 211 via the rectifier circuit λ. The bump is a control relay, a 2ff a contact, which is connected in series with the solenoid valve coil 3θ of the switch 3.

-M to the above-mentioned circuit device portion added by this invention.
Now, assuming that (7) third frequency signal /g from the final stage of frequency divider circuit /S is normally output, control relay 2g is constantly excited based on this third frequency signal. will be done. Now, assuming that the oscillation of the frequency divider circuit/S has stopped, no matter which stage this occurs, the oscillation of the third frequency signal, which is the output from the final stage, will also have stopped. , the coil of control relay 2g is demagnetized, its a contact knob is turned off, and solenoid valve 3
o is demagnetized and the corresponding switch 3 is turned off, thus
The main circuit of the chopper control device tends to open.

In this way, overheating and burnout of the brake series resistor 10 are reliably prevented, and since the control relay 2g is always excited by the third frequency signal /g, for example, the excitation power supply Control relay 2g is set to turn off if it goes down or if there is a disconnection at any point.
It also has a so-called fail-safe function.

〔Effect of the invention〕

As explained above in detail, according to the present invention, (1) by adding a simple circuit device to the final stage of the frequency dividing circuit that forms a part of this type of conventional electric vehicle control device, (g) This has the effect of reliably preventing overheating and burnout of the brake series resistor.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating a conventional device, and FIG. 2 is a diagram illustrating an embodiment of the present invention. l...tram line, co...pantograph, 3...switch,
10... Brake series resistor, //... Short circuit switch, /, 2... Chopper, /3... Branch circuit 1.2 Hiro...
Drive circuit for transistor 25, coro transformer, 2g
...Control relay, Cob...Control relay 2g a contact, 3
θ...Switch 3 solenoid valve coil. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In the electric vehicle control device, the frequency of a predetermined reference frequency signal is divided by a frequency dividing circuit to create a plurality of frequency signals, and the main circuit of the chopper control device is controlled based on these frequency signals. An electric vehicle control device comprising means for forcibly opening the main circuit when detecting an abnormality in the final stage output of the frequency dividing circuit.