JP5980082B2 - External condition input circuit - Google Patents

Description

  The present invention relates to an external condition input circuit used for displaying, for example, a trip operation of a circuit breaker of a distribution board in a substation of a train feeder on a monitor of a central control unit of a train operation command station. A logic integrated circuit having a second drive voltage different from the first drive voltage, which is used in a high voltage application digital signal input device to which a voltage is applied, takes in an operation signal of the first drive voltage such as display or failure The present invention relates to an external condition input circuit that outputs an operation signal information digital signal to a digital information signal processing circuit.

  A conventional external condition input circuit in a conventional digital signal input device, for example, receives an operation signal information signal obtained by stepping down an external operation signal (circuit open / close by a relay contact) using a relay, a voltage dividing resistor circuit or a Zener diode. The operation signal information signal is converted into an operation signal information digital signal that can be used in a digital information signal processing circuit such as a logic integrated circuit such as TTL or CMOS via a photocoupler. (See Patent Document 1)

JP 2002-185296 A (FIGS. 1 to 5 and explanation thereof)

In the conventional external condition input circuit, the external condition input signal is temporarily received by a relay because of the difference between the drive voltage of the external condition input signal and the drive voltage of the digital information signal processing circuit such as a logic integrated circuit such as TTL or CMOS. It was necessary to convert the voltage to be applied to the information signal processing circuit. It was necessary to equip the relay used for this voltage conversion with another power source with a driving voltage DC24V different from the power source with driving voltages DC48V to DC110V of the external condition input signal.
Including the power supply used for applying the drive voltage DC5V of the logic integrated circuit such as TTL, CMOS, etc., it is necessary to prepare three types of power supplies, and the apparatus configuration is complicated.

  In addition, as shown in FIG. 1 of Patent Document 1, when the external condition input circuit is equipped with a relay, a mechanical movable part is provided in the circuit, and the probability of failure is high.

In a conventional external condition input circuit, as shown in FIG. 3 of Patent Document 1, a voltage dividing resistor is used to drive the drive voltage of an external condition input signal to a digital information signal processing circuit such as a logic integrated circuit such as TTL or CMOS. In a circuit for converting to a drive voltage, the voltage difference is converted into heat by a voltage dividing resistor and consumed, so that power is wasted.
Further, by converting the voltage difference into heat with a voltage dividing resistor and consuming it, a mechanism for radiating the generated heat is required, and the device configuration is complicated.

  In the conventional external condition input circuit, as shown in FIGS. 2 and 5 of Patent Document 1, the drive voltage of the external condition input signal is converted into the drive voltage of a logic integrated circuit such as TTL or CMOS using a Zener diode. In the circuit, a Zener diode becomes a noise source, which is one of the factors that induce malfunction of logic integrated circuits such as TTL and CMOS.

  The present invention has been made to solve the above-described problems, and an object thereof is to obtain a highly reliable external condition input circuit having a simple configuration, low power consumption, and few failures and malfunctions. Is.

An external condition input circuit according to the present invention is an external condition input circuit that takes in an operation signal of a first drive voltage and outputs an operation signal information digital signal of a second drive voltage different from the first drive voltage. A transformerless circuit that receives the operation signal of the first drive voltage, converts it to the second drive voltage different from the first drive voltage, and outputs the operation signal information digital signal of the second drive voltage. A third drive configured by a semiconductor voltage converter , wherein the transformerless semiconductor voltage converter is a semiconductor DC / DC converter, and has an output voltage different from the first and second drive voltages of the semiconductor DC / DC converter; The voltage causes the light emitting diode of the photocoupler to emit light, and the light receiving element of the photocoupler is turned on by the light emission of the light emitting diode, whereby the operation signal information And it outputs the digital signal.

The present invention is an external condition input circuit that takes in an operation signal of a first drive voltage and outputs an operation signal information digital signal of a second drive voltage different from the first drive voltage. A transformer-less semiconductor voltage converter that receives an operation signal of a drive voltage, converts it to the second drive voltage different from the first drive voltage, and outputs an operation signal information digital signal of the second drive voltage. The transformerless semiconductor voltage converter is a semiconductor DC / DC converter, and a third drive voltage that is an output voltage different from the first and second drive voltages of the semiconductor DC / DC converter is a photocoupler. the light emitting diodes emit light, by the light receiving element of the photocoupler is turned on by light emission of the light emitting diode, and outputs the operation signal information digital signal In, configuration is less reliable simple and power consumption is insignificant yet failure or malfunction, there is an effect that can be the first of different voltages to obtain an external condition input circuit of the third driving voltage.

It is a connection diagram which shows the example of the external condition input circuit of Embodiment 1 of this invention, and the example of its peripheral system. It is a connection diagram which shows the example of the preferable trans | transformerless semiconductor voltage converter in FIG. It is a connection diagram which shows the example of the semiconductor voltage converter considered in the process leading to this invention. It is an external appearance perspective view of the external condition input circuit built in the outer casing, (a) is a conventional external appearance perspective view, (b) is an external perspective view of the external condition input circuit according to the first embodiment. .

Embodiment 1 FIG.
A first embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows an example in which an external condition input circuit is applied when a trip operation of a circuit breaker SSCB of a distribution board SSC in a substation TSS of a train feeder is displayed on a monitor MTR of a central controller CCA of a train operation command station TDC. This is an example of an external condition input circuit used for a high voltage application digital signal input device to which a high voltage exceeding, for example, DC48V to DC100V is applied.
In FIG. 1, when a contact 2 connected to a DC power source 1 (DC 48V to DC 110V) serving as a first drive voltage is closed, a semiconductor DC / DC converter (hereinafter referred to as “semiconductor DC”) that is a DC / DC semiconductor voltage converter. The semiconductor DC / DC converter 5 is charged via the input terminals 3 and 4 of 5).
In the first embodiment, the contact 2 is an auxiliary contact (a contact) of the circuit breaker SSCB, and shows a case where the circuit breaker SSCB is closed when a trip operation occurs due to some abnormal state.

The semiconductor D / D converter 5 charged by closing the contact 2 outputs an operation signal of DC24V, which is a third drive voltage lower than the first drive voltage (DC48V to DC110V) of the DC power supply 1, from the output unit. To do.
The output voltage (third drive voltage) DC24V of the semiconductor D / D converter 5 causes the light emitting diode 10a of the photocoupler 10 to emit light via the backflow prevention diode 6 and the current limiting resistor 7, and light emission of the light emitting diode 10a. As a result, the light receiving element 10b of the photocoupler 10 is turned on, so that the signal reading unit 11 of the digital information signal processing circuit DIO such as a logic integrated circuit has a signal of DC5V (that is, an operation signal information digital signal) as the second drive voltage. Is output.

The resistor 8 and the diode 9 are provided as elements for suppressing chattering.
The application / non-application of the first drive voltage from the DC power source 1 by the opening / closing of the contact 2 between the input terminals 3 and 4 of the semiconductor DC / DC converter 5 becomes an external condition input signal. The contact 2 is opened and closed by the operation / non-operation of an upstream operation circuit (for example,...).

Next, the operation will be described.
In FIG. 1, it is assumed that the contact 2 is open and no power is supplied from the DC power supply 1 to the semiconductor DC / DC converter 5. (State shown)
In this case, no voltage is applied from the insulated DC 24V output of the semiconductor DC / DC converter 5 to the backflow prevention diode 6, the current limiting resistor 7, and the photocoupler 10. Therefore, the light emitting diode 10a does not emit light, and the light receiving element 10b becomes non-conductive. No signal (that is, operation signal information digital signal) is output to the signal reading unit 11 of the digital information signal processing circuit DIO such as an integrated circuit.

  When the contact 2 is closed by, for example, the trip operation of the circuit breaker SSCB, the power of the first drive voltage (DC48V to DC110V) is supplied from the DC power supply 1 to the semiconductor DC / DC converter 5, and the semiconductor DC / DC converter 5 A voltage of 24V DC (third drive voltage) is applied to the backflow prevention diode 6, the current limiting resistor 7, and the photocoupler 10 from the isolated DC 24V output, and the light emitting diode 10a emits light, whereby the light receiving element 10b becomes conductive, and the signal reading unit 11, a signal (that is, an operation signal information digital signal) is output.

  When a signal (that is, an operation signal information digital signal) is output to the signal reading unit 11, the digital information signal processing circuit DIO such as a logic integrated circuit, for example, information on which circuit breaker SSCB of which substation has tripped. A signal is transmitted to the central control unit CCA of the train operation command station TDC, and the central control unit CCA displays on the monitor MTR which breaker SSCB of which substation has tripped. The digital information signal processing circuit DIO feeds back an information signal indicating whether the circuit breaker SSCB has tripped to the control circuit of the switchboard SSC of its corresponding substation TSS. For example, the control circuit of the switchboard SSC itself is fed back. Based on the received information signal, the alarm lamp for displaying the trip operation of its own circuit breaker SSCB is turned on.

Next, an example of a preferable semiconductor D / D converter (semiconductor voltage converter) 5 will be described with reference to FIG.
In FIG. 2, a semiconductor D / D converter 5 is a transformerless semiconductor voltage conversion device including a semiconductor switching element (chopper) Q such as a transistor, a smoothing capacitor C, a reactor (choke coil) L, and a freewheel diode D. is there.

The operation of the transformerless semiconductor voltage converter 5 of FIG. 2 will be described below.
When DC 48V to 110V is applied between the input 3 and the input 4 due to the closing operation of the contact 2, when the switching element (chopper) Q is in a conductive state (element is ON), a current is supplied to the reactor (choke coil) L. While flowing, energy is stored in the reactor (choke coil) L, and a voltage is applied to the output terminal of the insulated DC 24V. In addition, when the switching element (chopper) Q is in an insulated state (element is OFF), the reactor (choke coil) L generates an electromotive force in an attempt to maintain a current, and a voltage is applied to the insulated DC24V output terminal through the freewheel diode D. The
When the switching element (chopper) Q is switched between the conduction state (switching element Q is ON) and the insulation state (switching element Q is OFF) alternately, and current is intermittently applied to the reactor (choke coil) L , A reactor (choke coil) L, a smoothing capacitor C, and a transient phenomenon caused by a resistance component existing in the circuit occurs, and the DC 48V to 110V applied between the input 3 and the input 4 is stepped down to obtain the desired insulated DC 24V output. It is done. At this time, a ripple voltage is generated at the output terminal of the insulated DC 24V due to intermittent current application or transient phenomenon. In order to reduce this ripple, the smoothing capacitor C suppresses the ripple voltage.

  As described above, the example of the first embodiment is a conventional case of “a relay contact, a resistor, a diode, a Zener diode, and a photocoupler connected to a DC power source, and an external condition input terminal, an external condition output terminal, The function of stepping down the voltage applied by the transformerless semiconductor DC / DC converter (transformerless semiconductor voltage converter) 5 rather than the external condition input circuit for stepping down the applied voltage by the voltage dividing resistor, Zener diode, etc. External condition input circuit.

  Although it is functionally possible to use a semiconductor voltage conversion device having a transformer TR as shown in FIG. 3 as the semiconductor voltage conversion device 5, the semiconductor voltage conversion device having the transformer TR is generally large. When installing in a confined place such as inside a switchboard, the occupied area becomes large, which is not preferable, and the transformer itself generates heat, so it is necessary to avoid the vicinity of the control circuit section in the switchboard, and the installation place It has been found in the process of reaching the present invention that problems such as the above-mentioned restrictions occur.

FIG. 4 is an external perspective view of an external condition input circuit built in the outer casing 5C, and FIG. 4A is a conventional “connected to a DC power source, consisting of a relay contact, a resistor, a diode, a Zener diode, and a photocoupler. FIG. 2 is an external view of an “external condition input circuit that steps down an applied voltage by a voltage dividing resistor between an external condition input terminal and an external condition output terminal”, and (b) is a transformerless semiconductor according to the first embodiment. It is an external view of the external condition input circuit using a voltage converter.
As can be seen by comparing (a) and (b) of FIG. 4, the external condition input circuit (b) of the first embodiment is half the size of the conventional external condition input circuit (a). In particular, it has been found that the lateral width W is almost ½ of that of the conventional external condition input circuit (a), and that there is almost no heat dissipation from the outer casing 5C.

  Note that the present invention can also be applied to the case where the first drive voltage of DC48V to DC110V in FIG. 1 is alternating current. In this case, the semiconductor DC / DC converter 5 includes a semiconductor AC / DC converter that is an AC / DC semiconductor voltage converter. do it.

  Although FIG. 1 illustrates the case where the first drive voltage DC48V to DC110V is stepped down to the first drive voltage DC5V, for example, the processing result of a digital information signal processing circuit (not shown) such as a logic integrated circuit is shown upstream. When applied to the external condition input circuit of the operation circuit reflected in the operation circuit (not shown), the semiconductor DC / DC converter 5 boosts the output signal so that the drive voltage of the output signal is higher than the drive voltage of the input signal. The semiconductor DC / DC converter 5 to be used may be used.

  In the present invention, the embodiments can be modified as appropriate within the scope of the invention.

1 DC power supply (DC48V ~ DC110V), 2 contacts, 3 terminals,
4 terminals, 5 semiconductor DC / DC converter (semiconductor voltage converter),
5C outer casing, 6 backflow prevention diode, 7 current limiting resistor,
8 Chattering suppression resistor, 9 Chattering suppression diode,
10 photocoupler, 10a light emitting element, 10b light receiving element,
11 Signal reading unit, CCA central control unit, MTR monitor,
SSC switchboard, SSCB circuit breaker, TDC train operation command center,
TSS Electric substation for trains.

Claims (2)

An external condition input circuit that takes in an operation signal of a first drive voltage and outputs an operation signal information digital signal of a second drive voltage different from the first drive voltage;
Transformerless semiconductor voltage that receives the operation signal of the first drive voltage, converts the second drive voltage to be different from the first drive voltage, and outputs the operation signal information digital signal of the second drive voltage Consisting of a conversion device ,
The transformerless semiconductor voltage converter is a semiconductor DC / DC converter, and a third drive voltage that is an output voltage different from the first and second drive voltages of the semiconductor DC / DC converter is a light emitting diode of a photocoupler. And an external condition input circuit for outputting the operation signal information digital signal when the light receiving element of the photocoupler is turned on by light emission of the light emitting diode . 2. The external condition input circuit according to claim 1, wherein each of the first to third drive voltages is a DC voltage .

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