JP2010147008A - Load control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load control device which reduces a heating value during energization to a load to allow miniaturization and increased capacity, and does not need limitation of a moment of the load such as a fluorescent lamp or an incandescent lamp. <P>SOLUTION: As a switch element 11a for a primary switch portion 11, a main switch element is used which is connected serially to a commercial power supply 2 and the load 3, has each of gates G1 and G2 where a control voltage is applied to each of connecting points D1 and D2, and has a horizontal dual-gate transistor structure including one voltage resistance portion. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a two-wire load control device connected in series between a load such as an AC power source and a lighting device.

  Conventionally, load control devices for lighting devices using contactless switching elements such as triacs and thyristors have been put into practical use. These load control devices generally have a two-wire connection from the viewpoint of reduced wiring, and are connected in series between an AC power source and a load. Thus, in a load control device connected in series between an AC power supply and a load, how to secure its own circuit power supply becomes a problem.

  A load control device 50 of the first conventional example shown in FIG. 21 is connected in series between the AC power supply 2 and the load 3, and includes a main switching unit 51, a rectifying unit 52, a control unit 53, and a control unit 53. A first power supply unit 54 for supplying stable power, a second power supply unit 55 for supplying power to the first power supply unit 54 when power to the load 3 is stopped, and power supply to the load 3 are performed. The third power source unit 56 supplies power to the first power source unit 54 when it is connected, and an auxiliary opening / closing unit 57 that energizes a minute current in the load current. The main switch element 51a of the main opening / closing part 51 is configured by a triac.

  In the off state of the load control device 50 in which no power is supplied to the load 3, the voltage applied from the AC power supply 2 to the load control device 50 is supplied to the second power supply unit 55 via the rectification unit 52. The second power supply unit 55 is a constant voltage circuit composed of a resistor and a Zener diode. The current flowing through the load 3 at this time is a minute current that does not cause the load 3 to malfunction, the current consumption of the control unit 53 is small, and the impedance of the second power supply unit 55 is set to be kept high.

  On the other hand, in the ON state of the load control device 50 in which power is supplied to the load 3, the third power supply unit 56 is turned on by the control signal from the control unit 53, and the impedance of the load control device 50 is lowered to reduce the load 3 As the amount of current flowing through the first power supply section 56 increases, the current flowing through the third power supply section 56 also flows through the first power supply section 54 and starts charging the buffer capacitor 54a. When the charging voltage of the buffer capacitor 54a becomes higher than a predetermined threshold value, the Zener diode 56a constituting the third power supply unit 56 breaks down and current starts to flow, current flows into the gate of the auxiliary switching unit 57, and the auxiliary switching unit 57 conducts (closed state). As a result, the current flowing from the rectifying unit 52 to the third power source unit 56 is commutated to the auxiliary switching unit 57 and further flows into the gate of the main switching element 51a of the main switching unit 51, and the main switching unit 51 becomes conductive (closed). Status). Therefore, almost all the electric power is supplied to the load 61. Once the main opening / closing part 51 becomes conductive (closed state), the current continues to flow. However, when the alternating current reaches the zero cross point, the main switch element 51a self-extinguishes and the main opening / closing part 51 is non-conductive (open state). )become. When the main opening / closing part 51 becomes non-conductive (open state), a current flows again from the rectifying part 52 through the third power supply part 56 to the first power supply part 54, and the operation for securing the self-circuit power supply of the load control device 50 is performed. . In other words, the self-circuit power supply securing of the load control device 50, the conduction of the auxiliary opening / closing part 57, and the conduction operation of the main opening / closing part 51 are repeated every half cycle of the alternating current.

  A load control device 60 of the second conventional example shown in FIG. 22 is connected in series between the AC power source 2 and the load 3, and includes a main opening / closing unit 61, a rectifying unit 62, a control unit 63, and a control unit 63. The first power supply unit 64 for supplying stable power, the second power supply unit 65 for supplying power to the first power supply unit 64 when the power to the load 3 is stopped, and the power supply to the load 3 are performed. The third power source unit 66 supplies power to the first power source unit 64 when the power source is disconnected, and the zero cross detection unit 67 detects the zero cross point of the load current. A MOSFET is used as the main switch element 61a of the main opening / closing unit 61, and an incandescent lamp is used as a control target load.

  When power is supplied to the load 3, the main switch element 61a of the main switching unit 61 is turned on only for a period according to the dimming level input from the outside, but at the timing when the zero cross detection unit 67 detects the zero cross point of the voltage. The switch element 61a is turned on (closed state), and the main switch element 61a is turned off (opened state) after the above period has elapsed. While the main opening / closing part 61 is non-conductive (open state), the self-circuit power supply of the load control device 60 is ensured as in the first conventional example. When the main opening / closing part 61 is made non-conductive (open state), the zero cross detection part 67 detects the zero cross point again, and the operation of making the main switch element 61a conductive (closed state) is performed every half cycle of AC. repeat.

  When the main switch element of the main switching unit 51 is a triac or thyristor as in the load control device 50 of the first conventional example, in order to reduce noise generated when power is supplied to the load 3, and power to the load 3 In order to prevent malfunction caused by noise propagated from the power supply 2 when the supply is stopped, it is necessary to provide a filter. However, the size of the coil 58 constituting the filter and the heat generated by the coil become a problem, and the load control device is small. Is difficult.

  In order to reduce noise caused by the load control device without using a filter, for example, in the load control device described in Patent Document 1 (third conventional example), in addition to the main switch element of the main switching unit, the main switch element A second switch unit having a higher on-resistance than the (first switch unit) is provided, and the first switch unit is turned on after the second switch unit is turned on. However, in the third conventional example, the number of switch elements increases, the circuit configuration becomes complicated, and the control of switch-on timing becomes complicated.

  In recent years, electric fluorescent lamps have been widely used due to demands for energy saving. However, when the main switch element 61a of the main switching unit 61 is a transistor as in the load control device 60 of the first conventional example, the load is an incandescent lamp. Such a load current and load voltage are limited to loads having the same phase (power factor 1). Therefore, there is a demand for a two-wire load control device that does not select the type of load to be connected, such as a fluorescent lamp or an incandescent lamp.

Further, a triac or a transistor used as a main switching element of the main opening / closing part is made of Si, and is generally a vertical type in which current flows in the vertical direction of the element. In the case of a triac, since a PN junction exists in the energization path, a loss is generated because the barrier is overcome. Further, in the case of a transistor, a loss occurs during energization because it is necessary to connect the two elements in opposite directions and the resistance of the low carrier concentration layer serving as the withstand voltage maintaining layer is high. Due to these losses, the main switch element itself generates a large amount of heat and requires a large heat sink, which hinders an increase in capacity and size of the load control device. In general, such a load control device is used by being housed in a metal box or the like provided on a wall surface. However, since there is a limit to downsizing of a conventional load control device, it is currently generally used. Depending on the size of the box used, the load control device cannot be used in combination with other sensors or switches. Therefore, further reduction in size of the load control device is required in order to allow the load control device and other sensors, switches, and the like to be provided in a box having a general size.
JP 2006-92859 A

  The present invention has been made to solve the above-described problems of the prior art, and can reduce the amount of heat generated when the load is energized to reduce the size and increase the capacity. Further, the present invention can provide a fluorescent lamp and an incandescent lamp. An object of the present invention is to provide a load control device that does not require a load power factor limitation.

  In order to achieve the above object, the invention of claim 1 is a two-wire load control device connected in series between an AC power source and a load, which is connected in series to the commercial power source and the load, and is connected to each other. A main switch element having a horizontal dual gate transistor structure having a gate to which a control voltage is applied to each point and one withstand voltage portion, and controlling the supply of power to a load An auxiliary switching element having a switching element and a thyristor-type auxiliary switching element, and controlling the supply of power to a load when the main switching part is non-conductive; and the main switching part and the auxiliary switching part A control unit that controls opening and closing; a first power supply unit that is supplied with power from both ends of the main switching unit via a rectifying unit and supplies a stable voltage to the control unit; and a rectifying unit that is connected to both ends of the main switching unit. Power to the load and When the supply is stopped, the second power supply unit that supplies power to the first power supply unit, the drive circuit that drives the main opening / closing unit, and the main opening / closing unit or the auxiliary opening / closing unit are closed. A third power source that supplies power to the first power source when power is supplied to the load; and a voltage detector that detects a voltage input to the third power source. When the control unit detects that the voltage input to the third power supply unit has reached a predetermined threshold value while supplying power to the load, the control unit sets the main opening / closing unit to a first predetermined level. The auxiliary opening / closing part is turned on for a second predetermined time when the main opening / closing part is non-conducting.

  According to a second aspect of the present invention, there is provided the load control device according to the first aspect, wherein two sets of the drive circuits are provided corresponding to the dual gates of the main switch elements, and the diodes are connected to the first power supply unit, One end connected to each power line, the other end connected to the capacitor, and a drive switch connected between the connection point of the diode and the capacitor and each gate terminal of the main switch element of the main switching unit It is comprised by an element, A drive electric power is supplied to the said main opening / closing part by making the said drive switch element conductive by the signal from the said control part.

  According to a third aspect of the present invention, in the load control device according to the second aspect, the drive switch element in the drive circuit includes a light emitting unit that outputs light according to a drive signal from the control unit, and a light output from the light emitting unit. Is a light-insulating semiconductor switch element configured to receive light and conduct, and when the light-receiving part conducts, the driving power is supplied to the main switching part using the power of the first power supply. It is characterized by.

  According to a fourth aspect of the present invention, in the load control device according to the third aspect, the light emitting sections of the two optically insulated semiconductor switch elements in the drive circuit are connected in series.

  According to a fifth aspect of the present invention, in the load control device according to any one of the second to fourth aspects, the drive circuit is a connection point where the gate electrode of the main switch element and the drive switch element are connected. And a capacitor connected between the gate electrode and a power line serving as a reference of the gate electrode.

  A sixth aspect of the present invention is the load control device according to any one of the first to fifth aspects, wherein the AC line of the rectifying unit is connected between the negative output point and the point where the AC line of the rectifying unit is connected. And the synchronous switch element is closed in synchronization with the operation of closing the main opening / closing section.

  A seventh aspect of the present invention is the load control device according to any one of the first to sixth aspects, wherein the third power supply unit detects a voltage input to the third power supply unit. And outputting a pulse signal for causing the main opening / closing part to conduct for a first predetermined time when the voltage detection part detects that the voltage input to the third power supply part has reached a predetermined threshold value. An open / close unit drive signal output unit, a voltage zero cross detection unit that detects a zero cross of the voltage input to the third power supply unit, and another pulse for a third predetermined time when the voltage zero cross detection unit detects a voltage zero cross A driving permission signal output unit that outputs a signal, and the control unit drives the driving signal so that the main opening / closing unit is closed only during a period in which both the main opening / closing unit driving signal and the driving permission signal are generated. Output And features.

  The invention according to claim 8 is the load control device according to claim 6, wherein the drive switch element has a thyristor or triac structure, and the drive switch element is a power supply unit of any one of the load control devices. It is driven by an isolated signal.

  According to a ninth aspect of the present invention, in the load control device according to any one of the first to eighth aspects, the control unit is operated by a remote control signal.

  A tenth aspect of the present invention is the load control device according to the ninth aspect, further comprising a fourth power source connected to the first power source and rectifying the remote control signal, wherein the remote control signal is transmitted. The power of the remote control signal is supplied to the first power supply unit via the fourth power supply unit to start the control unit, and the control unit is included in the remote control signal. When the address is recognized, the third power supply unit is operated to drive the main opening / closing unit to supply power to the load.

  According to the first aspect of the present invention, the structure of the main switch element of the main opening / closing part of the two-wire load control device is a dual semiconductor chip having an efficient semiconductor chip configuration for low loss (low resistance) in AC control. Due to the gate transistor structure, the load control device can be reduced in size and capacity.

  According to the second aspect of the present invention, the simple power source based on the potential of the power line can be configured with small and inexpensive components. Furthermore, since the power for driving the main switch element can be sent with high efficiency without changing the power, it becomes possible to easily drive the main switch element having a dual gate transistor configuration.

  According to the invention of claim 3, the timing for driving the main opening / closing part can be transmitted by the optically isolated semiconductor switching element, and the main switching element having the dual gate transistor configuration can be easily driven. It becomes possible.

  According to the invention of claim 4, since the current consumption in the light emitting part of the drive switch element in the drive circuit can be halved, the power that must be secured when supplying power to the load can be reduced and stable. Operation can be realized.

  According to the fifth aspect of the present invention, noise generated by the operation of the main opening / closing section can be kept low, and a noise filter can be eliminated, so that it is inexpensive and small, and maintains a high impedance when the load control device is off. Is possible.

  According to the invention of claim 6, when driving the main opening / closing part, even if the main switch element of the main opening / closing part is an element that needs to pass current to the gate part, power is stably supplied to the gate part. can do. Therefore, it is possible to realize a small-sized and high-capacity two-wire load control device equipped with a low-loss dual gate switch element.

  According to the seventh aspect, even when the load capacity to be connected is small and it takes time to charge the capacitor inside the load control device, the operation of charging once in a half cycle can be stably realized.

  According to the eighth aspect of the invention, it is possible to suppress the power for driving the drive switch element for sending the drive power to the gate part of the main switch element of the main opening / closing part.

  According to the ninth aspect of the present invention, a plurality of non-residential load control devices can be remotely controlled.

  According to the tenth aspect of the present invention, even when the two-wire load control device is in an off state, the current flowing through the load can be completely cut off, so that the malfunction of the load due to the standby current is eliminated and the load control device can be connected. The range of the load is expanded and the second power supply unit is not necessary.

(Basic configuration of the present invention)
First, the main switch element used in the load control device according to the present invention described below will be described. This main switch element is different from the above-described conventional example in that it is a main switch element having a horizontal dual gate transistor structure having one withstand voltage portion. FIG. 1 (a) shows a circuit diagram of a main switch element having a horizontal dual gate transistor structure with one withstand voltage portion, and FIG. 1 (b) shows two reference examples as in the second conventional example. The circuit diagram at the time of reversely connecting a MOSFET type transistor element is shown. FIG. 2 shows a vertical cross-sectional configuration of a main switch element having a horizontal dual gate transistor structure.

  In the conventional configuration shown in FIG. 1B, the source electrodes S of the two transistor elements are connected to each other and grounded (lowest potential portion), and the withstand voltage is between the source electrode S and the gate electrodes G1 and G2. Is required, and a withstand voltage is required between the gate electrodes G1 and G2 and the drain electrodes D1 and D2, so two withstand voltage portions (for example, a withstand voltage distance are opened) are required. Since the two transistor elements operate with a gate signal based on the source electrode, they can be driven by inputting the same drive signal to the gate electrodes G1 and G2 of each transistor element. On the other hand, as shown in FIG. 2, the main switch element having a horizontal dual-gate transistor structure is a structure that realizes a bidirectional element with a small loss, with only one part maintaining the withstand voltage. On the other hand, the element having this configuration needs to be controlled with reference to the voltages of the drain electrodes D1 and D2, and it is necessary to input different drive signals to the two gate electrodes G1 and G2, respectively. Call).

  FIG. 3 is a circuit diagram showing a basic configuration of the load control device 1 according to the present invention, and FIG. 4 is a time chart showing signal waveforms in each part of the load control device 1. Here, the specific configuration of the drive circuit 10 is not shown, and the specific configuration of the drive circuit 10 will be described in the following embodiment.

  A load control apparatus 1 according to the first embodiment shown in FIG. 1 is connected in series between an AC power supply 2 and a load 3, and has a main opening / closing section 11 that controls supply of power to the load 3, and a main opening / closing section. Drive circuit 10 for driving 11, rectifier 12, controller 13 for controlling the entire load controller 1, first power supply 14 for supplying stable power to controller 13, and load 3 A second power supply unit 15 that supplies power to the first power supply unit 14 when the power is stopped, and a third power supply unit that supplies power to the first power supply unit 14 when power is supplied to the load 3 16 and an auxiliary opening / closing portion 17 that energizes a minute current in the load current. The third power supply unit 16 is further provided with a voltage detection unit 18 that detects a voltage input to the third power supply unit. The main opening / closing part 11 has a main switch element (abbreviated in the drawing) 11a having the horizontal dual gate transistor structure, and the auxiliary opening / closing part 17 has an auxiliary switch element having a thyristor structure.

  Even in the off state of the load control device 1 in which power supply to the load 3 is not performed, since a current flows from the power source 2 to the second power source unit 15 via the rectifying unit 12, a minute current also flows to the load 3. However, the current is kept low enough not to cause the load 3 to malfunction, and the impedance of the second power supply unit 15 is maintained at a high value.

  When power is supplied to the load 3, the impedance of the third power supply unit 16 is lowered, a current is supplied to the circuit side inside the load control device 1, and the buffer capacitor 25 of the first power supply unit 14 is charged. As described above, the third power supply unit 16 is provided with the voltage detection unit (charge monitoring unit) 18 and detects the voltage input to the third power supply unit 16. When the voltage detection unit 18 detects that the voltage input to the third power supply unit 16 has reached a predetermined threshold value, the voltage detection unit 18 outputs a predetermined detection signal. When the control unit 13 receives the detection signal from the voltage detection unit 18, the control unit 13 conducts the main opening / closing unit 11 with respect to the drive circuit 10 so that the main opening / closing unit 11 is conducted (closed) for a first predetermined time. The first pulse signal (main opening / closing part drive signal) is output. In FIG. 3, a first pulse output unit (mainly configured by hardware using a dedicated IC or the like so as to directly output the first pulse signal according to the detection signal from the voltage detection unit 18. A configuration example in which an opening / closing unit drive signal output unit) 19 is provided as a part of the control unit 13 is shown. Alternatively, the configuration is not limited to the illustrated configuration, and the output from the voltage detection unit 18 may be input to the main control unit 20 configured by a CPU or the like, and the first pulse signal may be output by software. Good. The first predetermined time for conducting the main opening / closing part 11 is preferably set to a time slightly shorter than a half cycle of the commercial frequency power supply.

  Next, when the main opening / closing part 11 starts an operation of becoming non-conductive (open state) after the first predetermined time has elapsed, the control unit 13 opens the auxiliary opening / closing part 17 for the second predetermined time (for example, several hundred μm). For 2 seconds). In this operation, when the main switching unit 11 becomes non-conductive and the load current starts to flow into the auxiliary switching unit 17, the flow continues to flow into the auxiliary switching unit 17 until the load current becomes zero. In FIG. 3, after detecting that the main opening / closing part 11 has become non-conductive (open state), the second pulse for the second predetermined time is applied to the auxiliary opening / closing part 17 for the second predetermined time. The example which provided the 2nd pulse output part 21 which outputs a signal (auxiliary opening-and-closing part drive signal) as a part of control part 13 is shown. Alternatively, the second pulse signal may be output by software, or a similar operation may be realized by a delay circuit using a diode or a capacitor.

  Referring to FIG. 2, these operations reduce the energization current after supplying power from the main switching unit 11 to the load 3 for most of the half cycle of the commercial power supply after the buffer capacitor 25 is fully charged. After that, power is supplied from the auxiliary opening / closing unit 17 to the load 3. Since the auxiliary opening / closing section 17 includes the auxiliary switch element 17a having a thyristor structure, the auxiliary opening / closing section 17 becomes non-conductive (open state) when the current value becomes zero (zero cross point). When the auxiliary opening / closing part 17 becomes non-conductive (open state), the current again flows into the third power supply part 16, and thus the above operation is repeated every half cycle of the commercial power supply. Since these operations are performed with respect to the load current, the load 3 is not limited to one with a power factor of 1, even if the main switching unit 11 is composed of a main switch element 11a having a transistor structure. A two-wire load control device suitable for any lamp can be realized. Further, since the main opening / closing part 11 is constituted by the main switch element 11a having a horizontal dual gate transistor structure, the number of places where the withstand voltage of the transistor element is required is limited to one, and the main switch element when the load is energized By reducing the amount of heat generated by itself, the load control device can be simultaneously reduced in size and increased in capacity.

  Further, FIG. 3 shows an example in which a current detection unit 22 for detecting a current flowing through the auxiliary opening / closing unit 17 is provided. This is because the auxiliary opening / closing unit is connected when a frequency shift or an overload is connected. By performing the operation of switching the load current path from 17 to the main switching unit 11 again, the auxiliary switching unit 17 is protected from destruction. Therefore, the current detection unit 22 is not necessarily required, and may be provided as necessary.

(First embodiment)
Next, the load control apparatus 1A according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a circuit diagram of the load control device 1A according to the first embodiment, and FIG. 6 is an enlarged view of the drive circuit 10 in FIG.

  The first embodiment embodies the drive circuit 10 in the load control apparatus 1, and as shown in FIGS. 5 and 6, the drive circuit 10 for driving the main opening / closing unit 11 is composed of a main switch element. Two pairs corresponding to the dual gate of 11a are provided, diodes 101a and 101b connected to the first power supply unit 14 of the load control device 1A, one end connected to each power line, and the other end of the diodes 101a and 101b. Capacitors 102a and 102b connected to each other, and drive switch elements 103a and 103b connected between the connection points of the diodes 101a and 101b and the capacitors 102a and 102b and the gate terminals of the main switch element 11a of the main switching unit 11. It is configured. The drive switch elements 103a and 103b are turned on / off by a signal from the control unit 13. Further, the drive switch elements 103a and 103b are configured such that the switch unit and the operation unit are insulated. The configuration of the drive switch elements 103a and 103b is not particularly limited, and various types can be used as described below.

  According to this configuration, the first power supply unit 14 of the load control device 1A is connected to the other end of the capacitors 102a and 102b, one end of which is connected to the power line, via the diodes 101a and 101b. A simple power source as a reference is constituted by the capacitors 102a and 102b. Charging of the capacitors 102a and 102b is performed by connecting the current flowing from the high power supply voltage side of the power line to the low voltage power line via the internal power supply of the load control device 1A to the low voltage side. This is done by charging a capacitor. At that time, since the capacitor connected to the higher voltage side is not charged, the capacitor is repeatedly charged every cycle of the power supply frequency. The capacitor on the opposite side is charged at a timing opposite to that described above in relation to the potential of the power line.

  When the main switch element 11a having a horizontal dual gate transistor structure is turned on from off, a voltage is applied to the gate of the main switch element 11a with reference to a point where a power line is connected (see FIG. 1B). There is a need. Here, when the drive switch element 103a or 103b connected to the gate electrode of the main switch element 11a of the main switching unit 11 is turned on by a signal from the control unit 13, a power line is connected to each gate terminal of the main switch element 11a. Since the charged voltage is applied to the reference capacitor, the main switch element 11a becomes conductive (closed). Once the main switch element 11a becomes conductive, the voltage across the terminals of the main switch element 11a becomes very small, so that it is applied from the power supply of the load control device 1 via the diodes 101a and 101b and the drive switch elements 103a and 103b. It is possible to maintain continuity at a voltage of

  In this embodiment, since the drive circuit 10 is configured to be non-insulated from the first power supply unit 14, it is possible to supply drive power with high efficiency. Since the capacitors 102a and 102b only need to temporarily determine the potential of the gate electrode when the main switch element 11a is turned on from off, the shape and capacity of the capacitors 102a and 102b may be small. In FIG. 5, power is supplied from the output of the first power supply unit 14 to the drive circuit 10. However, power may be supplied from a relatively stable power supply unit such as an input of the first power supply unit 14.

  7 and 8 show specific configuration examples of the drive circuit 10, and optically-insulating semiconductor switch elements such as photocouplers and photorelays are used as the drive switch elements 103a and 103b. When a drive signal from the control unit 13 is input, an optical signal is output from the light emitting unit of the optically insulated semiconductor switch element. When the optical signal is incident on the light receiving unit, the light receiving unit conducts, and from the first power supply unit 14 Current (drive signal) flows. Since the light emitting unit and the light receiving unit are electrically insulated, no drive signal is input to the gate electrode of the main switch element 11a unless light is output from the light emitting unit. Therefore, based on the drive signal from the control unit 13, the drive switch elements 103a and 103b connected to the gate electrode of the main switch element 11a can be easily turned on and off while maintaining insulation.

  9 and 10 show a modification of the drive circuit 10 shown in FIGS. In this modification, the light emitting portions of the drive switch elements 103a and 103b using optically insulated semiconductor switch elements such as photocouplers and photorelays are connected in series. Thereby, the value of the current flowing through the drive circuit 10 can be reduced to about ½, and the power consumption in the drive circuit 10 can be reduced.

  11 and 12 show another modification of the drive circuit 10 shown in FIGS. In this modification, the light emitting parts of the drive switch elements 103a and 103b using optically insulated semiconductor switch elements such as photocouplers and photorelays are connected in series, and the gate electrode of the main switch element 11a of the main switching part 11 Capacitors 104a and 104b are connected between a connection point to which the drive switch elements 103a and 103b are connected and a power line serving as a reference for the gate electrode. The capacitors 104a and 104b may be added to the configuration example of the drive circuit 10 shown in FIGS.

  As shown in this modification, by adding the capacitors 104a and 104b, when the drive switch elements 103a and 103b are turned on / off, the capacitors 104a and 104b apply to the gate electrode of the main switch element 11a. A sudden change in voltage can be mitigated, and the main switch element 11a can be prevented from turning on and off rapidly. As a result, noise generated when the main switch element 11a of the main opening / closing part 11 is turned on / off can be reduced, so that the noise filter can be reduced or omitted. That is, as compared with the configuration of the conventional example shown in FIG. 21 or FIG. 22, a coil or a capacitor that functions as a noise filter can be omitted.

  Regarding the coil constituting the noise filter, as the rated current of the load control device increases, this coil also increases in size. Therefore, if the coil can be omitted, the load control device can be reduced in size. In addition, regarding the capacitor constituting the noise filter, there are few restrictions on the size of the load control device compared to the coil, but the presence of this capacitor reduces the impedance of the load control device when the load control device is off. This is not preferable as an off state of the load control device. Also, even when the load control device is off, an alternating current flows through the capacitor, which may cause the load to malfunction. Therefore, if the capacitor for the noise filter can be omitted from the load control device, it is a preferable form for the two-wire load control device.

(Second Embodiment)
Next, a load control device 1B according to a second embodiment of the present invention will be described with reference to FIG. In the load control device 1A according to the first embodiment, when a drive signal is applied to the main switch element 11a of the main switching unit 11, the circuit configuration is such that no current flows through the diode of the rectifier unit 12, and thus the main switch element 11a. It is only possible to use a voltage type whose gate part (gate terminal) does not require a current value above a certain level. In the second embodiment, even when the main switch element 11a of the main opening / closing part 11 is a current-type main switch element that requires a certain current value or more, it can be driven stably.

  As shown in FIG. 13, in the load control device 1B according to the second embodiment, the synchronous switch elements 120a and 120b are connected between the AC line of the rectifying unit 12 and the negative side output of the rectifying unit serving as a circuit reference, In synchronization with the operation of closing the main opening / closing section 11, the operation of turning on the synchronous switch elements 120a and 120b is performed. When the synchronous switch elements 120a and 120b are closed in synchronization with the operation of closing the main opening / closing part 11, the first power supply part 14 in the load control device 1B is connected to the gate part of the main switching element 11a of the main opening / closing part 11. A path for passing current is formed. Therefore, even if the gate part of the main switch element 11a is a dual gate element that requires current, it can be driven stably. Other configurations and basic operations are the same as in the case of the first embodiment, and the configuration of the drive circuit 10 is not particularly limited, and the basic configuration and each modification of the first embodiment can be applied. .

(Third embodiment)
Next, a load control device 1 </ b> C according to a third embodiment of the present invention will be described with reference to FIGS. 14 and 15. FIG. 14 is a circuit diagram showing a basic configuration of a load control device 1C according to the third embodiment, and FIG. 15 is a time chart showing signal waveforms in each part of the load control device 1C. The load control device 1C according to the third embodiment has a voltage zero cross detection unit (provided in the third power supply unit 16 functioning in a state of supplying power to the load) in the basic configuration of the load control device 1 shown in FIG. And a third pulse output unit 24. The specific configuration of the drive circuit 10 may be any of those exemplified in the first embodiment and the second embodiment.

  When the voltage zero cross detector 23 detects the voltage zero cross, the third pulse output unit 24 outputs the third pulse signal (drive permission indication signal) for a third predetermined time. As shown in FIG. 15, the third predetermined time of the third pulse corresponds to a time slightly shorter than a half cycle of the power supply cycle. The drive signal is closed so that the gate electrode of the main switch element 11a of the main switching unit 11 is closed only during a period in which both the first pulse (main switching unit drive signal) and the third pulse (drive permission signal) are generated. Is entered.

  In the two-wire load control device, when the connected load is small, the time required for charging the capacitor 25 becomes long. In this case, in the operation shown in FIG. 4, when the main opening / closing part 11 is driven based on the completion of charging, the drive signal of the main opening / closing part 11 may be applied until a time exceeding the current zero cross point. In this state, when the main opening / closing part 11 is opened and the auxiliary opening / closing part 17 is closed, the load current, which is the main current, is energized in the auxiliary opening / closing part 17 and is charged once every half cycle of the commercial power source. The stable operation to perform is lost.

  However, as in the third embodiment, the voltage zero cross and the charge completion signal are combined, and the main switching unit can be controlled not to be driven over a half cycle of the commercial power supply based on the voltage zero cross signal. Regardless of the capacity of the load connected to 1C, the operation of securing the power supply can be stably realized once every half cycle of the commercial power supply.

(Fourth embodiment)
Next, a load control device 1D according to a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 16 is a circuit diagram showing a configuration of a load control device 1D according to the fourth embodiment, FIG. 17 is an enlarged view of the drive circuit 10 in FIG. 16, and FIG. 18 is a diagram of each part of the load control device 1D. It is a time chart which shows a signal waveform.

  In the load control device 1D according to the fourth embodiment, the drive circuit 10 of the main switching unit 11 includes high-breakdown-voltage diodes 101a and 101b connected to the first power supply unit 14 of the load control device 1D, and one end of each power line. Capacitor 102a, 102b with the other end connected to diode 101a, 101b, between the connection point of diode 101a, 101b and capacitor 102a, 102b, and each gate terminal of main switch element 11a of main switching unit 11 And self-extinguishing type drive switch elements 105a and 105b such as a photothyristor or a phototriac.

  When charging completion is detected by the voltage detection unit 18 provided in the third power supply unit 16, the operation moves to the operation of closing the main opening / closing unit 11. At that time, a signal is inputted to make the drive switch elements 105a and 105b connected to the gate electrode of the main switch element 11a of the main opening / closing part 11 conductive. These drive switch elements 105a and 105b have a thyristor or triac structure. Therefore, the drive switch elements 105a and 105b need only be driven by the trigger signal. Therefore, the drive power of the drive switch elements 105a and 105b can be made smaller than those of the above embodiments. Further, in order to make the drive switch elements 105a and 105b non-conductive, it is only necessary to open the synchronous switch elements 120a and 120b provided in the rectifying unit 12, and the drive power for opening and closing the main switching unit 11 is reduced. It becomes possible. For a two-wire load control device, how to enable load control while ensuring a stable power supply is an important issue, so that the drive power of the load control device is small for stable operation of the load. desirable.

(Fifth embodiment)
Next, a load control device 1D according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 19 is a circuit diagram showing a configuration of a load control device 1E according to the fifth embodiment. As the basic configuration of the load control device 1E, any of the configurations of the above-described embodiments and modifications thereof can be adopted.

  The load control device 1E according to the fifth embodiment is used to control a plurality of lighting fixtures in a non-residential such as an office building or a commercial facility, for example, and is, for example, a control panel installed at a location away from the lighting device. A plurality of such devices are arranged. And it receives the remote control signal 27 from the operation switch (not shown) etc. which were installed in the place away from the control panel, and is comprised so that the on / off of the load control apparatus 1E may be controlled. Therefore, an operation switch is connected to the main control unit 20 via wiring, and when the main control unit 20 recognizes its own address superimposed on the remote control signal 27, a control signal is sent from the main control unit 20. Is output.

  FIG. 20 shows a configuration of a modification of the load control device 1E according to the fifth embodiment. In this modified example, a fourth power supply unit 26 configured by a rectifier circuit is further connected to the main control unit 20, and the main control unit 20 (or control unit 13) is rectified by rectifying the electric power obtained from the remote control signal 27. The power is secured. As described above, in the two-wire load control device, even when the load control device is turned off, the second power supply unit 15 is provided to secure the power supply of the main control unit 20, so that a weak current is always applied to the load 3. Is flowing. However, as in this modification, by securing a separate power source for the main control unit 20, the second power source unit 15 becomes unnecessary, so that when the load control device 1E is in an off state, a current is supplied to the load 3. It does not flow at all, and the deterioration and malfunction of the load 3 can be prevented.

(A) is a circuit diagram of the main switch element of the horizontal type dual gate transistor structure which has one withstand voltage part, (b) is a circuit diagram at the time of connecting two MOSFET type transistor elements reversely as a reference example. The longitudinal cross-sectional view of the main switch element of a horizontal type dual gate transistor structure. The circuit diagram which shows the basic composition of the load control apparatus which concerns on this invention. The time chart which shows the signal waveform in each part of a load control apparatus. 1 is a circuit diagram of a load control device according to a first embodiment of the present invention. FIG. 6 is an enlarged view of the drive circuit in FIG. 5. FIG. 3 is a circuit diagram illustrating a specific configuration example of a drive circuit of the load control device according to the first embodiment. The enlarged view of the drive circuit in FIG. The circuit diagram which shows the modification of the drive circuit of the load control apparatus which concerns on 1st Embodiment. FIG. 10 is an enlarged view of the drive circuit in FIG. 9. The circuit diagram which shows the other modification of the drive circuit of the load control apparatus which concerns on 1st Embodiment. FIG. 12 is an enlarged view of the drive circuit in FIG. 11. The circuit diagram of the load control apparatus which concerns on 2nd Embodiment of this invention. The circuit diagram of the load control apparatus which concerns on 3rd Embodiment of this invention. The time chart which shows the signal waveform in each part of the load control apparatus in 3rd Embodiment. The circuit diagram which shows the structure of the load control apparatus which concerns on 4th Embodiment of this invention. FIG. 17 is an enlarged view of the drive circuit in FIG. 16. The time chart which shows the signal waveform in each part of the load control apparatus in 4th Embodiment. The circuit diagram of the load control apparatus which concerns on 5th Embodiment of this invention. The circuit diagram which shows the modification of the load control apparatus which concerns on 5th Embodiment. The circuit diagram which shows the structure of the load control apparatus which concerns on a 1st prior art example. The circuit diagram which shows the structure of the load control apparatus which concerns on a 2nd prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A-1E: Load control apparatus 2: Power supply 3: Load 10: Drive circuit 11: Main switching part 11a: Main switch element 12: Rectification part 13: Control part 14: 1st power supply part 15: 2nd power supply part 16 : Third power supply unit 17: auxiliary switching unit 18: voltage detection unit 19: first pulse output unit (main switching unit drive signal output unit)
20: Main control unit 21: Second pulse output unit 22: Current detection unit 23: Zero-cross detection unit 24: Third pulse output unit (drive permission signal output unit)
25: Buffer capacitor 26: Fourth power supply unit 27: Remote control signal 101a, 101b: Diode 102a, 102b: Capacitor 103a, 103b: Drive switch element 104a, 104b: Capacitor 105a, 105b: Drive switch element 120a, 120b: Synchronous switch element

Claims (10)

A two-wire load control device connected in series between an AC power source and a load,
It has a main switch element with a horizontal dual gate transistor structure that is connected in series to a commercial power supply and a load, has one gate to which a control voltage is applied to each connection point, and one withstand voltage portion. And a main switching unit that controls the supply of power to the load;
Having an auxiliary switch element of a thyristor structure, and when the main switching unit is non-conductive, an auxiliary switching unit that controls supply of power to a load;
A control unit that controls opening and closing of the main opening and closing unit and the auxiliary opening and closing unit;
A first power supply unit that is supplied with power from both ends of the main switching unit via a rectifying unit and supplies a stable voltage to the control unit;
A second power supply unit that supplies power to the first power supply unit when power is supplied from both ends of the main opening / closing unit via the rectification unit and power supply to the load is stopped;
A drive circuit for driving the main opening and closing unit;
A third power supply for supplying power to the first power supply when the main switch or the auxiliary switch is in a closed state and supplying power to a load;
A voltage detection unit for detecting a voltage input to the third power supply unit;
When the voltage detection unit detects that the voltage input to the third power supply unit has reached a predetermined threshold while supplying power to the load, the control unit opens the main switching unit. A load control device characterized in that the auxiliary opening / closing part is turned on for a second predetermined time while the main opening / closing part is non-conducting while conducting for a predetermined time.   Two sets of the drive circuits are provided corresponding to the dual gates of the main switch elements, respectively, a diode connected to the first power supply unit, one end connected to each power line, and the other end connected to the capacitor And a drive switch element connected between a connection point of the diode and the capacitor and each gate terminal of the main switch element of the main switching unit, and the drive switch element is made conductive by a signal from the control unit The load control device according to claim 1, wherein driving power is supplied to the main opening and closing unit. The drive switch element in the drive circuit is an optically isolated semiconductor switch element configured by a light emitting unit that outputs light according to a drive signal from the control unit and a light receiving unit that receives and conducts light output from the light emitting unit. Yes,
3. The load control device according to claim 2, wherein when the light receiving unit is turned on, driving power is supplied to the main opening / closing unit using power of the first power source.   4. The load control device according to claim 3, wherein the light emitting portions of the two optically insulated semiconductor switch elements in the drive circuit are connected in series.   The drive circuit further includes a capacitor connected between a connection point where the gate electrode of the main switch element and the drive switch element are connected, and a power line serving as a reference of the gate electrode. The load control device according to any one of claims 2 to 4.   The synchronous switch element is connected between the point where the AC line of the rectifying unit is connected and the negative output point thereof, and the synchronous switch element is synchronized with the operation of closing the main opening / closing unit. The load control device according to any one of claims 1 to 5, wherein a closing operation is performed. The third power supply unit
A voltage detection unit for detecting a voltage input to the third power supply unit;
A main switching unit that outputs a pulse signal for conducting the main switching unit for a first predetermined time when the voltage detection unit detects that the voltage input to the third power supply unit has reached a predetermined threshold. A drive signal output unit;
A voltage zero-cross detector that detects a zero-cross of a voltage input to the third power source;
A drive permission signal output unit that outputs another pulse signal for a third predetermined time when the voltage zero cross detection unit detects a voltage zero cross;
The said control part outputs a drive signal so that the said main opening / closing part may be closed only during the period when both the said main opening / closing part drive signal and the said drive permission signal are emitted. Item 7. The load control device according to any one of Items 6.   The drive switch element has a thyristor or triac structure, and the drive switch element is driven by a signal insulated from any power supply unit of the load control device. Load control device.   The load control device according to claim 1, wherein the control unit is operated by a remote control signal. A fourth power source connected to the first power source and rectifying the remote control signal;
When the remote control signal has been transmitted, the power of the remote control signal is supplied to the first power supply unit via the fourth power supply unit, the control unit is activated, and the control unit 10. The apparatus according to claim 9, wherein when the self address included in the remote control signal is recognized, the third power supply unit is operated to drive the main opening / closing unit to supply power to the load. The load control device described.

Images