Drive circuit

Abstract

This invention provides a drive circuit that reduces wiring time by configuring power lines and communication lines in the same circuit. [Solution] To achieve the above objective, a drive circuit according to one embodiment of the present invention comprises a power supply, a first circuit, and a second circuit. The power supply has a first polarity and a second polarity opposite to the first polarity. The first circuit is driven by a current of the first polarity. The second circuit is driven by a current of the second polarity. This makes it possible to reduce wiring man-hours by enabling the simultaneous use of power and communication with a single power supply wiring due to the property of AC power supply polarity changing.

Description

Technical Field

[0001] The present invention relates to a drive circuit applicable to power line communication and the like.

Background Art

[0002] Conventionally, in a device having two or more functions within one device, power lines and communication lines for each function are required, resulting in an increase in wiring work.

[0003] For example, Patent Document 1 discloses a push-button type notification device installed in a tunnel for communicating disasters and the like to the outside. Such a push-button type notification device includes an indicator light that is constantly lit and a switch (push button) for notifying the outside. In this case, the wiring for the indicator light and the wiring for the switch are provided individually.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Since such push-button type notification devices are installed in a tunnel at intervals of 50 m or the like, the on-site wiring is complicated, and when updating the wiring, it is necessary to implement traffic regulations on the road, resulting in additional costs in addition to the wiring work.

[0006] In view of the above circumstances, an object of the present invention is to provide a drive circuit capable of reducing wiring work by configuring a power supply line and a communication line with the same circuit.

Means for Solving the Problems

[0007] To achieve the above objective, a drive circuit according to one embodiment of the present invention comprises a power supply, a first circuit, and a second circuit. The above power supply has a first polarity and a second polarity opposite to the first polarity. The first circuit described above is driven by a current of the first polarity described above. The second circuit described above is driven by the current of the second polarity described above.

[0008] The above-described drive circuit comprises a power supply, a first circuit, and a second circuit, wherein the power supply has a first polarity and a second polarity opposite to the first polarity. The first circuit is driven by a current of the first polarity. The second circuit is driven by a current of the second polarity. This reduces wiring man-hours by enabling the simultaneous use of power and communication with a single power supply wiring due to the property of AC power supply polarity changing.

[0009] The first circuit described above may include a first diode that allows only current of the first polarity to pass through, and a load circuit connected in series with the first diode. In this case, the load circuit may include an indicator light.

[0010] The second circuit described above may include a switch for conducting or interrupting current of the second polarity, and a second diode that allows only current of the second polarity to pass through. In this case, the drive circuit may further include a detection unit that detects when current has been conducted by the switch by detecting current of the second polarity.

[0011] The above-described drive circuit may further include a DC power supply connected in series with the above-described power supply.

[0012] The first circuit described above may include a first diode that allows only current of the first polarity to pass through, and a DC power supply connected in series with the first diode.

[0013] The second circuit may include a second diode that allows only the current of the second polarity to pass therethrough, and a DC power supply connected in series to the second diode.

[0014] The voltage output from the power supply may include a sine wave or a rectangular wave.

[0015] The drive circuit may further include a first DC power supply arranged in series with the power supply. In this case, the first circuit may include a first diode that allows only the current of the first polarity to pass therethrough, and a second DC power supply connected in series to the first diode. The second circuit may include a second diode that allows only the current of the second polarity to pass therethrough, and a third DC power supply connected in series to the second diode. The voltage of the third DC power supply may be less than or equal to the voltage of the second DC power supply.

[0016] The voltage of the second DC power supply may be less than or equal to the sum of the voltage of the power supply and the voltage of the first DC power supply. In this case, the voltage of the third DC power supply may be greater than or equal to the difference between the voltage of the power supply and the voltage of the first DC power supply.

Advantages of the Invention

[0017] As described above, according to the present invention, due to the property that the polarity of the AC power supply changes, it is possible to reduce the wiring work by enabling the combined use of the power supply and communication with a single power supply wiring.

Brief Description of the Drawings

[0018] [Figure 1] It is a diagram showing a drive circuit according to the present invention. [Figure 2] It is a diagram showing a voltage waveform. [Figure 3] It is a diagram showing another example of a voltage waveform. [Figure 4] It is a diagram showing an example of controlling the conduction time of the first circuit. [Figure 5] It is a diagram showing a drive circuit in a DC power supply according to another embodiment. [Figure 6] It is a diagram showing a drive circuit according to another embodiment.

Embodiments for Carrying Out the Invention

[0019] Hereinafter, embodiments according to the present invention will be described while referring to the drawings.

[0020] FIG. 1 is a diagram showing a drive circuit 100 according to the present invention.

[0021] In FIG. 1, the drive circuit 100 includes a control device 10 and a plurality of push-button type notification devices 20 (in FIG. 1, a push-button type notification device 20A and a push-button type notification device 20B).

[0022] As shown in FIG. 1, the control device 10 includes a power source 1 and a detection unit 2. In this embodiment, the power source 1 has a first polarity and a second polarity opposite to the first polarity. For example, the power source 1 uses a commercial power source (100V) or the like, and alternately outputs a current of the first polarity or a current of the second polarity at predetermined intervals.

[0023] For example, the first polarity is a positive polarity, and the second polarity is a negative polarity. In this embodiment, the current of the first polarity is output in the forward direction (the direction of arrow 3 in FIG. 1), and the current of the second polarity is output in the reverse direction (the direction of arrow 4 in FIG. 1).

[0024] The detection unit 2 detects a current. In this embodiment, the detection unit 2 detects the current of the second polarity output from the power source 1. For example, a photocoupler is used for the detection unit 2. As shown in FIG. 1, when a current of the second polarity flows, the photocoupler outputs light by the light-emitting diode 5. The output light is output as a signal (in this embodiment, a push-button signal) to the outside by the light-receiving device 6.

[0025] Also in this embodiment, a diode 7 for outputting a current of the first polarity to the first circuit 21 is arranged in parallel with the detection unit 2 in the control device 10.

[0026] The push-button type notification device 20 has a first circuit 21 to which a current of the first polarity is supplied, and a second circuit 24 to which a current of the second polarity is supplied.

[0027] In this embodiment, the first circuit 21 includes a first diode 22 and an indicator light 23. As shown in Figure 1, the first diode 22 allows only current of the first polarity to pass through, supplying current to the indicator light 23. That is, the indicator light 23 lights up at predetermined intervals when current of the first polarity flows.

[0028] In this embodiment, the second circuit 24 includes a second diode 25 and a switch 26. As shown in Figure 1, the second diode 25 allows only current of the second polarity to pass through when the switch 26 is ON. For example, in the push-button type notification device 20, the switch 26 is turned ON when the user presses a button to notify the outside that an accident has occurred in the tunnel. As a result, current of the second polarity flows to the detection unit 2, and the state in which the switch 26 is ON is transmitted to the outside.

[0029] The number of push-button notification devices 20 is not limited, and many more push-button notification devices 20 may be provided in addition to push-button notification devices 20A and 20B. Furthermore, the configuration of each push-button notification device 20 may be the same or different.

[0030] The configuration of the control device 10 is not limited; for example, an ammeter or the like may be used as the detection unit 2 in addition to a photocoupler. Similarly, the configuration of the push-button type notification device 20 is not limited; any configuration is acceptable as long as it consists of a first circuit 21 driven by a current of a first polarity and a second circuit 24 driven by a current of a second polarity. For example, a buzzer or the like may be provided as a load circuit instead of the indicator light 23. Also, for example, a touch sensor or a heat sensor may be provided instead of the switch 26 in the second circuit 24. Furthermore, for example, load circuits or switches may be provided in both the first circuit 21 and the second circuit 24.

[0031] Here, using Figure 2, we will explain the current of the first polarity and the current of the second polarity output from the power supply, as well as the current waveforms in each block.

[0032] Figure 2 shows voltage waveforms. Figure 2A shows the voltage waveform output from the power supply. Figure 2B shows the waveform of the first polarity current when it passes through the first diode 22. Figure 2C shows the waveform of the second polarity current when it passes through the second diode 25.

[0033] As shown in Figure 2A, when power supply 1 is a commercial power supply (e.g., 100V), a sine wave is output. In this case, the current of the first polarity becomes a positive polarity pulsating current due to diode 7 and the first diode 22, as shown in Figure 2B.

[0034] The positive polarity pulsating current is supplied to the first circuit 21, causing the indicator light 23 to illuminate. Also, the forward current of the first polarity is blocked by the second diode 25, so the second circuit 24 is not driven even if the switch 26 is turned on.

[0035] As shown in Figure 2C, the current of the second polarity becomes a negative pulsating current through the second diode 25 when the switch 26 of the second circuit 24 is turned on. This negative pulsating current is then output to the outside as a push-button signal through the photocoupler. However, since the negative pulsating current is blocked by the first diode 22, the indicator light 23 does not light up.

[0036] In other words, the first circuit 21 is driven every positive half-cycle, and the second circuit 24 is driven every negative half-cycle.

[0037] Furthermore, the power supply circuit is not limited to a sine wave (commercial power supply); a square wave is also acceptable.

[0038] Figure 3 shows another example of a voltage waveform. Figure 3A shows the voltage waveform output from power supply 1. Figure 3B shows the waveform of the first polarity current when it passes through the first diode 22. Figure 3C shows the waveform of the second polarity current when it passes through the second diode 25.

[0039] For example, if the voltage waveform output from power supply 1 is a square wave as shown in Figure 3A, when it is supplied to the indicator light 23 of the first circuit 21, the first diode 22 will cause it to become the waveform shown in Figure 3B. When it passes through the second circuit 24 and is output to the detection unit 2, it will become the waveform shown in Figure 3C.

[0040] Furthermore, in this embodiment, the current of the first polarity and the current of the second polarity are output alternately every half cycle, so the time ratio is 1:1. However, the time ratio is not limited to 1:1, and the time ratio between the current of the first polarity and the current of the second polarity may be set arbitrarily. This will be explained in detail with reference to Figure 4.

[0041] Figure 4 shows an example of controlling the conduction time of the first circuit 21. Figure 4A shows an example of controlling the conduction time of the first circuit 21. Figures 4B and 4C show current waveforms.

[0042] As shown in Figure 4A, the first circuit 21 includes the first diode 22 and the indicator light 23, as well as a DC power supply 31 (voltage E a The following are arranged in series. In Figure 4A, the DC power supply 31 is connected in the opposite direction to the direction of the current of the first polarity (forward direction), so the voltage flowing through the first circuit 21 is E a It decreases by minutes. If E a When = 0, the current waveform is as shown in Figure 4B, and the time ratio of positive to negative (sections 32 and 33) is 1:1. Also, the voltage of the DC power supply 31 is E a When = a, the current waveform becomes as shown in Figure 4B, and the time ratio of positive to negative (sections 34 and 35) is no longer 1:1. Voltage E of DC power supply 31 a The same applies when it is negative.

[0043] In other words, by inserting the DC power supply 31 only into the first circuit 21, which is the load circuit, a voltage is applied, making it possible to control the phase of the conduction waveform. This allows the conduction angle to be arbitrarily controlled based on the magnitude of the voltage of the inserted DC power supply 31.

[0044] Furthermore, the method for controlling the time ratio of polarity is not limited, and any method may be used.

[0045] As described above, the property of AC power supply to change polarity allows for the simultaneous use of power and communication through a single power supply wire, thereby reducing wiring man-hours. In this embodiment, the first circuit 21, which is the indicator light circuit, and the second circuit 24, which is the switch circuit, utilize separate positive and negative polarities of AC power supply (sine wave) in half-wave mode, thereby enabling the consolidation of power lines and communication lines. In other words, since power lines and communication lines can be configured in the same circuit, wiring man-hours can be halved.

[0046] <Other Embodiments> This technology is not limited to the embodiments described above, and various other embodiments can be realized. In the following description, parts that are similar to the configuration and operation of the drive circuit described in the above embodiments will be omitted or simplified.

[0047] Figure 5 shows a drive circuit 200 in a DC power supply according to another embodiment. Note that in Figure 5, only one push-button type notification device 20 is shown for simplification.

[0048] As shown in Figure 5, the control device 10 includes a power supply 1, a detection unit 2, and a diode 7, in addition to a DC power supply 201 (voltage E0) connected in series with the power supply 1. The DC power supply 201 applies a voltage in the same direction as the direction of the current of the first polarity (forward direction). That is, by applying voltage E0 to the sine wave output from the power supply 1, the polarity of the power supply line, which only carries voltage, can be made unipolar (DC).

[0049] Also, in FIG. 5, in addition to the first diode 22 and the indicator lamp 23, a DC power supply 202 (voltage E1) is arranged in series in the first circuit 21. Since the DC power supply 202 is connected in the opposite direction to the direction of the current of the first polarity, the voltage flowing through the first circuit drops by E1.

[0050] Also, in the second circuit 24, in addition to the second diode 25 and the switch 26, a DC power supply 203 (voltage E2) is arranged in series. Since the DC power supply 203 is connected in the same direction as the direction of the current of the second polarity, the voltage flowing through the second circuit rises by E2.

[0051] In this embodiment, in order not to cause a circulating current in the first circuit 21 and the second circuit 24, the magnitude relationship between the voltage E1 of the DC power supply 202 and the voltage E2 of the DC power supply 203 is E2 ≦ E1.

[0052] Also, depending on the magnitude relationship between the voltage E1 and the voltage E2, the driving time of the first circuit 21 may be 50% or more, and the driving time of the second circuit 24 may be 50% or more. That is, since there may be a timing when both circuits start simultaneously, in order to avoid the total value of the start-up time of the first circuit 21 and the start-up time of the second circuit 24 exceeding 100%, the magnitude relationship between the voltage E1 of the DC power supply 202 and the voltage E2 of the DC power supply 203 needs to be E2 ≦ E1.

[0053] Also, there may be a case where the total of the driving time of the first circuit 21 and the driving time of the second circuit 24 does not reach 100%. In this case, the first circuit 21 or the second circuit 24 can be started for the necessary time, and an energy-saving effect (energy saving) becomes possible. Also, dimming of the indicator lamp 21 etc. becomes possible.

[0054] Also, when the peak value of the voltage of the power supply 1 is E, if the condition E0 + E < E1 is satisfied, the first circuit 21 stops operating. Similarly, if the condition E0 - E > E2 is satisfied, the second circuit 24 stops operating. Therefore, it is necessary not to satisfy either of the above two conditions. That is, it is necessary to satisfy E1 ≦ E0 + E and E2 ≧ E0 - E.

[0055] In this embodiment, voltages E0 and E1 may be the same value (E0-E1=0), or voltages E0 and E2 may be the same value (E0-E2=0). This is effective when the power supply voltage is DC. For example, in the case of AC, it is very complicated to prepare a voltage other than the commercial power supply (AC100V), so it is practical to use a DC power supply when you want to operate at a low voltage (e.g., 42V). Therefore, by superimposing a square wave of several volts using pulse waves, it is possible to practically lower the operating voltage of the circuit.

[0056] In this way, by applying a DC bias to the first diode 22 and the second diode 25, the threshold voltage is raised from 0V, making it possible to switch the circuit even with DC.

[0057] In addition to the above, a capacitor may be added in series with the first diode 22 and the second diode 25 to cut the DC component, thereby enabling operation in both DC and AC modes.

[0058] In the above embodiment, positive and negative polarity pulsating currents of a sinusoidal wave were output to the first circuit 21 and the second circuit 24. However, because the half-waves supplied to the first circuit 21 and the second circuit 24 are fast, flicker may occur. Therefore, smoothing may be performed by inserting a capacitor or the like into the drive circuit.

[0059] Figure 6 shows a drive circuit 300 according to another embodiment. Note that in Figure 6, only one push-button type notification device 20 is shown for simplification.

[0060] As shown in Figure 6, the control device 10 includes a power supply 1, a detection unit 2, and a diode 7, as well as a capacitor 301 connected in parallel to the detection unit 2. A diode 302 is connected in series with the capacitor 301 to prevent the passage of current of the first polarity.

[0061] The capacitor 301 smooths the waveform of the negative polarity pulsating current supplied to the detection unit 2. For example, the capacitor 301 charges when the negative polarity voltage is high and discharges when the voltage is low, thereby making the voltage difference closer to flat. In particular, in this embodiment, it is preferable that the capacitance is large enough so that the detection unit 2 does not feel like it is flickering and does not affect the operating voltage.

[0062] In the push-button type notification device 20, in addition to the first diode 22 and indicator light 23 in the first circuit 21, a capacitor 303 is connected in parallel to the indicator light 23.

[0063] Capacitor 303 smooths the waveform of the positive pulsating current supplied to the indicator light 23. For example, capacitor 303 charges when the positive voltage is high and discharges when the voltage is low, thereby making the voltage difference closer to flat. The capacitance of capacitor 303 is not particularly limited, as long as the indicator light 23 appears to be constantly lit in the tunnel.

[0064] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications can be made. Furthermore, the configurations of each embodiment and its modified form may be combined. [Explanation of Symbols]

[0065] 1…Power supply 2...Detection unit 10...Control device 20… Push-button type alarm device 21... First circuit 22...First diode 23…Indicator light 24...Second circuit 25...Second diode 26…Switch 100, 200, 300... drive circuits

Claims

1. A power supply having a first polarity and a second polarity opposite to the first polarity, A first circuit driven by the first polarity current, The second circuit is driven by the current of the second polarity and A drive circuit equipped with the following.

2. The drive circuit according to claim 1, The first circuit includes a first diode that allows only current of the first polarity to pass through, and a load circuit connected in series with the first diode. The load circuit includes an indicator light. Drive circuit.

3. The drive circuit according to claim 1, The second circuit includes a switch for energizing or interrupting the current of the second polarity, and a second diode that allows only the current of the second polarity to pass through. The drive circuit further includes a detection unit that detects when power is supplied by the switch by detecting a current of the second polarity. Drive circuit.

4. The drive circuit according to claim 1, further, Includes a DC power supply connected in series with the aforementioned power supply. Drive circuit.

5. The drive circuit according to claim 1, The first circuit includes a first diode that allows only current of the first polarity to pass through, and a DC power supply connected in series with the first diode. Drive circuit.

6. The drive circuit according to claim 1, The second circuit includes a second diode that allows only current of the second polarity to pass through, and a DC power supply connected in series with the second diode. Drive circuit.

7. The drive circuit according to claim 1, The voltage output from the aforementioned power supply includes a sine wave or a square wave. Drive circuit.

8. The drive circuit according to claim 1, further, The power supply has a first DC power supply connected in series with the aforementioned power supply, The first circuit includes a first diode that allows only current of the first polarity to pass through, and a second DC power supply connected in series with the first diode. The second circuit includes a second diode that allows only current of the second polarity to pass through, and a third DC power supply connected in series with the second diode. The voltage of the third DC power supply is less than or equal to the voltage of the second DC power supply. Drive circuit.

9. The drive circuit according to claim 8, The voltage of the second DC power supply is less than or equal to the sum of the voltage of the first DC power supply and the voltage of the power supply. The voltage of the third DC power supply is greater than or equal to the difference between the voltage of the first DC power supply and the voltage of the power supply. Drive circuit.

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