JP7135440B2 - terminal and lighting control system - Google Patents

Description

The present invention relates to terminals and lighting control systems.

Patent Literature 1 discloses a power supply system provided with a DC power supply unit that outputs DC power and a load such as a lighting fixture driven by the DC power. A secondary battery is provided in the DC power supply unit in preparation for a period in which power is not supplied from the AC power supply.

JP 2009-159692 A

In Patent Document 1, switching between an AC current source and a DC AC source is performed. At this time, when the DC current source is switched to the AC current source, the magnitude of the load connected to the AC current source changes. This can lead to instability in the output current or voltage of the alternating current source.

SUMMARY OF THE INVENTION An object of the present invention is to provide a terminal device and a lighting control system that can operate stably.

A terminal device according to a first disclosure includes a microcomputer that operates in response to a transmission signal from the outside, a power supply circuit that switches a power supply source to the microcomputer between the transmission signal and an external power supply, and the transmission a fluctuation suppression circuit for suppressing voltage overshoot or undershoot in a power supply path to the microcomputer by a signal when the power supply source is switched , wherein the fluctuation suppression circuit is supplied with the external power supply. Then, a load is added to the power feed path .
A terminal device according to a second disclosure includes a microcomputer that operates in response to a transmission signal from the outside, a power supply circuit that switches a power supply source to the microcomputer between the transmission signal and an external power supply, and the transmission a fluctuation suppression circuit for suppressing voltage overshoot or undershoot in a power supply path to the microcomputer by a signal when the power supply source is switched, wherein the fluctuation suppression circuit is supplied with the external power supply. The variation suppression circuit is connected between a damping resistor having one end connected to the power supply path, the other end of the damping resistor and a grounding terminal, and is turned on when the external power is supplied. and a switching element.

A lighting control system according to a third disclosure includes a lighting controller that transmits a transmission signal and a terminal device, the terminal device comprising a microcomputer that operates according to the transmission signal, and power supply to the microcomputer. A power supply circuit for switching a power supply source between the transmission signal and an external power supply, and suppressing voltage overshoot or undershoot in a power supply path to the microcomputer by the transmission signal when the power supply source is switched. a variation suppression circuit, the variation suppression circuit adding a load to the power supply path when the external power supply is supplied .

A terminal device and a lighting control system according to the present invention include a variation suppression circuit that suppresses voltage overshoot or undershoot when a power supply source is switched. Therefore, stable operation becomes possible.

1 is a block configuration diagram of a lighting control system according to Embodiment 1; FIG. 2 is a circuit diagram of a first portion of the terminal device according to Embodiment 1; FIG. 4 is a circuit diagram of a second portion of the terminal device according to Embodiment 1; FIG. 1 is a diagram illustrating a configuration of a lighting control system according to Embodiment 1; FIG.

A terminal device and a lighting control system according to an embodiment of the present invention will be described with reference to the drawings. The same reference numerals are given to the same or corresponding components, and repetition of description may be omitted.

Embodiment 1.
FIG. 1 is a circuit block diagram of a lighting control system 80 according to Embodiment 1. As shown in FIG. A lighting control system 80 includes a management device 81 , a lighting controller 82 that is a control device, a plurality of relay terminals 83 , and a plurality of relays 84 . The management device 81 is composed of, for example, a microcomputer or the like, and performs state monitoring and setting of the lighting control system 80 as a whole.

The lighting controller 82 communicates with a relay terminal device 83 , a wall switch (not shown), various sensors, and the like via the communication line 8 . Transmission signals emitted and received by the lighting controller 82 include address data and control data.

The management device 81 and the lighting controller 82 are connected by a LAN (Local Area Network) 7, which is a wired or wireless communication network. Four relay terminals 83 are connected in parallel to the lighting controller 82 via the communication line 8 . Various sensors such as an illuminance sensor and a motion sensor and an operation panel such as a wall switch are connected to the communication line 8 . Four relays 84 are connected to each relay terminal device 83 via control signal lines 9 .

A relay terminal device 83 and four relays 84 constitute a terminal device 100 . The terminal device 100 is a control system terminal device, and is also called a terminal device with a built-in relay. In this embodiment, four terminals 100 are connected to the lighting controller 82 . The number of terminals 100 provided in the lighting control system 80 may be one or more. Moreover, the relay 84 connected with the relay terminal device 83 should just be one or more.

Each relay terminal device 83 is assigned and set with a unique address. The relay terminal device 83 is identified by the set address. The relay terminal device 83 has a receiving section 831 that receives a transmission signal transmitted by the lighting controller 82 via the communication line 8 . The relay terminal device 83 also has a comparison unit 832 that compares the address data of the transmission signal with the unique address set in the relay terminal device 83 . When the comparison unit 832 determines that the address data of the transmission signal matches the unique address set in the relay terminal device 83, the relay terminal device 83 sends a control signal to the relay 84 to execute the control data of the transmission signal. to send.

Each relay 84 is connected to a load such as a lighting fixture (not shown). The relay 84 receives a signal from the relay terminal device 83 and interrupts power supplied to the load connected to the relay 84 based on the control data.

FIG. 2 is a circuit diagram of the first portion of terminal device 100 according to the first embodiment. FIG. 3 is a circuit diagram of the second portion of terminal device 100 according to the first embodiment. A first portion of the terminal 100 shown in FIG. 2 and a second portion of the terminal 100 shown in FIG.

The terminal device 100 includes a communication interface section 10 , a receiving circuit 20 , a transmitting circuit 30 , a fluctuation suppressing circuit 40 , a power supply circuit 50 , a control power generating circuit 60 and a microcomputer 90 . The communication interface section 10 communicates with a lighting controller 82 of a higher order. The receiving circuit 20 receives transmission signals via the communication interface section 10 . The transmission circuit 30 transmits transmission signals via the communication interface section 10 . The power supply circuit 50 generates control power from a transmission signal received via the communication interface section 10 .

The fluctuation suppression circuit 40 is provided between the communication interface section 10 and the power supply circuit 50 . The fluctuation suppression circuit 40 is also called a voltage amplitude absorption circuit. The microcomputer 90 receives control signals from the receiving circuit 20 and transmits control signals to the transmitting circuit. The control power generation circuit 60 is supplied with the power from the power supply circuit 50 or the DC power 70-1 converted from the external power supply 70, which is an AC power supply, and generates power to be supplied to the microcomputer 90. FIG.

The communication interface section 10 has a line filter 11 , a diode bridge 12 and a Zener diode 13 . The line filter 11 suppresses noise from the outside. The diode bridge 12 converts the transmission signal transmitted through the communication line 8 into a signal that matches the reference potential of the circuit of the terminal device 100 . That is, the diode bridge 12 converts the polarity of the transmission signal to match the reference potential of the circuit of the terminal device 100 . Zener diode 13 protects the circuitry of terminal 100 when overvoltage is applied through communication line 8 .

The receiving circuit 20 amplifies the transmission signal received by the communication interface section 10 and transmits it to the microcomputer 90 . An output terminal of the receiving circuit 20 is connected to a signal input terminal 92 of the microcomputer 90 .

The transmission circuit 30 amplifies the signal output by the microcomputer 90 and transmits it to the lighting controller 82 via the communication interface section 10 . An input terminal of the transmission circuit 30 is connected to a signal output terminal 91 of the microcomputer 90 .

The microcomputer 90 is also called a microcomputer. The microcomputer 90 operates according to transmission signals from the outside received via the communication interface section 10 . The microcomputer 90 controls each circuit section based on the transmission signal. The microcomputer 90 transmits signals to upper or lower control equipment. For example, the microcomputer 90 transmits its own setting information via the communication interface section 10 to the lighting controller 82 connected at a higher level.

In addition, the microcomputer 90 controls the lighting state of, for example, lighting fixtures connected in the lower order according to the transmission signal. Also, the microcomputer 90 may control, for example, the relay 84 according to the transmission signal. By opening and closing the relay 84, the microcomputer 90 changes the state of connection between the load and an external load power source 70a, which will be described later. The microcomputer 90 has the functions of the receiving section 831 and the comparing section 832 shown in FIG.

The power supply circuit 50 controls the microcomputer 90 or the like from the transmission signal received via the communication interface unit 10 when the DC power 70-1 converted from the external power supply 70 is not supplied to the control power supply generation circuit 60. Generates power to operate the circuitry. The power supply circuit 50 has a power generation control section 51 and a power generation section 52 . The power generation section 52 generates a predetermined voltage based on the transmission signal from the communication interface section 10 . The predetermined voltage is 24V, for example.

The power generation control unit 51 detects whether or not the external power supply 70 is supplied, stops the power generation unit 52 when the external power supply 70 is supplied, and operates the power generation unit 52 when the external power supply 70 is not supplied. Let

The power generation unit 52 has a P-type MOS-FET (Metal-Oxide-Semiconductor Field-Effect Transistor) 52a. The power generation control unit 51 has two N-type MOS-FETs 51a and 51b. A gate terminal of the MOS-FET 51a is supplied with DC power 70-1 converted from an external power supply 70. FIG. When the DC power 70-1 converted from the external power supply 70 is supplied to the gate terminal of the MOS-FET 51a, the MOS-FET 51a is turned on. The MOS-FET 51b is turned off when the MOS-FET 51a is turned on. At this time, the MOS-FET 51b lowers the gate voltage of the MOS-FET 52a. Therefore, the MOS-FET 52a is turned off, and the power generator 52 does not operate. That is, the power supply circuit 50 cuts off the power supply path 78 to the microcomputer 90 by the transmission signal when the external power supply 70 is supplied.

Conversely, when the DC power 70-1 converted from the external power supply 70 is not supplied to the gate terminal of the MOS-FET 51a, the MOS-FET 52a is turned on and the power generator 52 operates. In other words, the power supply circuit 50 conducts the power supply path 78 to the microcomputer 90 by the transmission signal when the external power supply 70 is not supplied.

Thus, the power supply circuit 50 switches the power supply source to the microcomputer 90 between the transmission signal and the external power supply 70 .

The control power generation circuit 60 is a so-called DC-DC converter. In a state where the power supply circuit 50 cuts off the power supply path 78 , the DC power 70 - 1 converted from the external power supply 70 is supplied to the control power supply generation circuit 60 . The control power generation circuit 60 generates power to be supplied to the microcomputer 90 from this DC power. The power supplied to the microcomputer 90 is, for example, 5V. The output voltage of the control power generation circuit 60 is input to the power terminal of the microcomputer 90 .

In a state where the power supply circuit 50 conducts the power supply path 78 , power from the transmission signal converted by the power supply circuit 50 is supplied to the control power generation circuit 60 . The control power generation circuit 60 generates power to be supplied to the microcomputer 90 from this power.

The fluctuation suppression circuit 40 is provided between the transmission signal input terminal 73 and the power supply circuit 50 in the power supply path 78 . The fluctuation suppressing circuit 40 includes a damping resistor 41 having one end connected to the power supply path 78, and a switching element 42 connected between the other end of the damping resistor 41 and a ground terminal. The damping resistor 41 is also called a bleeder resistor. The switching element 42 is, for example, a MOS-FET.

DC power converted from an external power supply 70 is supplied to the gate terminal of the switching element 42 . The switching element 42 is turned on when the external power supply 70 is supplied. As a result, the damping resistor 41 and the ground terminal are connected. That is, the fluctuation suppression circuit 40 operates when the external power supply 70 is supplied. The switching element 42 is a variation suppression circuit control unit that operates the variation suppression circuit 40 when the external power supply 70 is supplied and stops the variation suppression circuit 40 when the external power supply 70 is not supplied.

FIG. 4 is a diagram illustrating the configuration of the lighting control system 80 according to Embodiment 1. As shown in FIG. The external load power supply 70a is a power supply supplied to the lighting fixture 86 which is a load. In response to a control signal from microcomputer 90, relay 84 changes the connection state between lighting fixture 86 and external load power supply 70a. Thereby, the microcomputer 90 controls the lighting state of the lighting device 86 .

The output voltage of the external power supply 70 is converted by the AC/DC circuit 65 into a DC voltage of 14V. 4 corresponds to the communication interface unit 10, the receiving circuit 20, the transmitting circuit 30, and the variation suppressing circuit 40. The communication power supply circuit shown in FIG.

Next, the operation of the lighting control system 80 of this embodiment will be described. When the external power supply 70 is not supplied to the terminal device 100 , the power supply circuit 50 generates DC power from the transmission signal input to the communication interface section 10 . At this time, since the external power supply 70 is not supplied, the fluctuation suppressing circuit 40 is in an off state.

When an external power supply is supplied to the terminal device 100 , DC power 70 - 1 based on the external power supply 70 is supplied to the control power generation circuit 60 . At the same time, the fluctuation suppression circuit 40 is turned on in accordance with the supply of the external power supply 70, and the power supply circuit 50 is switched to the external power supply 70 side.

Consider a comparative example without the variation suppression circuit 40 . When the power supply circuit 50 suddenly switches to the external power supply 70 side, the inductance or the like provided in the power supply path 78 tries to continue to flow current from the host device to the power supply circuit 50 via the communication interface section 10 . Therefore, the voltage of the power supply path 78 has an amplitude due to the influence of the inductance component of the line filter 11 and the like. The amplitude of the voltage on feed path 78 is also called overshoot or undershoot.

Here, the power feed path 78 is provided with a transmission signal reception circuit 20 and a transmission signal transmission circuit 30 . At this time, if the voltage amplitude is large, there is a possibility that the receiving circuit 20 and the transmitting circuit 30 cannot perform normal transmission and reception. Furthermore, the receiving circuit 20 and the transmitting circuit 30 may malfunction.

However, in the present embodiment, the variation suppression circuit 40 is provided in the power feed path 78 . When the power supply circuit 50 is suddenly switched to the external power supply 70 side due to the operation of the fluctuation suppression circuit 40 , the current flowing from the host device through the communication interface unit 10 flows to the fluctuation suppression circuit 40 . Therefore, overshoot or undershoot of the voltage of power supply path 78 can be suppressed. That is, in the comparative example without the fluctuation suppression circuit 40, the load on the power supply path 78 is lightened by switching the power supply circuit 50 to the external power supply 70 side. In the present embodiment, the fluctuation suppressing circuit 40 bears the lightened load. Therefore, the voltage amplitude can be suppressed.

Thus, the fluctuation suppression circuit 40 suppresses overshoot or undershoot of the voltage of the power supply path 78 by bearing the load when the power supply source to the microcomputer 90 is switched. Thereby, stable communication can be performed in the transmission circuit 30 and the reception circuit 20 . Therefore, the terminal device 100 and the lighting control system 80 can operate stably.

Further, if the fluctuation suppression circuit 40 is operated while the power supply circuit 50 is switched to the external power supply 70 side, an apparent load is generated on the power supply path 78 . At this time, a larger current flows from the external device to the communication interface section 10 than in the case where the fluctuation suppression circuit 40 is not provided. By increasing the current flowing through the communication interface unit 10, the influence of external noise superimposed on the communication line 8 can be relatively suppressed. Further, the reference potential of the communication interface section 10 can be stabilized by increasing the current flowing through the communication interface section 10 .

Further, in the present embodiment, the variation suppression circuit 40 does not operate when the external power supply 70 is not supplied. As a result, the power consumption of the variation suppression circuit 40 can be suppressed. As a modification of the present embodiment, the variation suppression circuit 40 may operate when the external power supply 70 is not supplied. By always operating the fluctuation suppressing circuit 40, the switching element 42 becomes unnecessary, and the configuration of the terminal device 100 can be simplified.

In this embodiment, the power supply circuit 50 switches the power supply source to the microcomputer 90 between the transmission signal and the external power supply 70 according to the supply state of the external power supply 70 . Not limited to this, the power supply circuit 50 may switch the power supply source to the microcomputer 90 according to the voltage of the communication line 8 or the voltage of the power supply path 78 or the like.

Further, in the present embodiment, the fluctuation suppression circuit 40 operates at the same time that the power supply circuit 50 switches the power supply source to the microcomputer 90 . Alternatively, the power supply circuit 50 may switch the power supply source for the microcomputer 90 to the external power supply 70 after the fluctuation suppression circuit 40 operates. As a result, the voltage amplitude can be reliably suppressed.

Note that the technical features described in the present embodiment may be used in combination as appropriate.

7 LAN, 8 communication line, 9 control signal line, 10 communication interface unit, 11 line filter, 12 diode bridge, 13 Zener diode, 20 receiving circuit, 30 transmitting circuit, 40 fluctuation suppression circuit, 41 damping resistor, 42 switching element, 50 power supply circuit, 51 power supply generation control unit, 51a, 51b, 52a MOS-FET, 52 power supply generation unit, 60 control power supply generation circuit, 65 AC/DC circuit, 70 external power supply, 70a external load power supply, 70-1 DC power , 73 input terminal, 78 power feeding path, 80 lighting control system, 81 management device, 82 lighting controller, 83 relay terminal device, 831 receiving unit, 832 comparing unit, 84 relay, 86 lighting fixture, 90 microcomputer, 91 signal output terminal , 92 signal input terminal, 100 terminal device

Claims (7)

a microcomputer that operates according to a transmission signal from the outside;
a power supply circuit that switches a power supply source to the microcomputer between the transmission signal and an external power supply;
a variation suppression circuit that suppresses voltage overshoot or undershoot in the power supply path to the microcomputer by the transmission signal when the power supply source is switched;
with
The terminal device , wherein the variation suppression circuit adds a load to the power supply path when the external power supply is supplied . 2. The terminal device according to claim 1, wherein the power supply circuit cuts off the power supply path when the external power supply is supplied. 3. The terminal device according to claim 1, wherein said fluctuation suppressing circuit operates when said external power supply is supplied. a microcomputer that operates according to a transmission signal from the outside;
a power supply circuit that switches a power supply source to the microcomputer between the transmission signal and an external power supply;
a variation suppression circuit that suppresses voltage overshoot or undershoot in the power supply path to the microcomputer by the transmission signal when the power supply source is switched;
with
The fluctuation suppression circuit operates when the external power supply is supplied,
The fluctuation suppression circuit is
a damping resistor having one end connected to the power feed path;
a switching element connected between the other end of the damping resistor and a grounding terminal and turned on when the external power supply is supplied;
A terminal device comprising: 5. The terminal device according to any one of claims 1 to 4, wherein the variation suppressing circuit is provided between the input terminal of the transmission signal and the power supply circuit in the power supply path. . 6. The terminal device according to any one of claims 1 to 5, wherein a receiving circuit or a transmitting circuit for said transmission signal is provided in said feeding path. a lighting controller that transmits a transmission signal;
a terminal;
with
The terminal device
a microcomputer operating according to the transmission signal;
a power supply circuit that switches a power supply source to the microcomputer between the transmission signal and an external power supply;
a variation suppression circuit that suppresses voltage overshoot or undershoot in the power supply path to the microcomputer by the transmission signal when the power supply source is switched;
with
The lighting control system , wherein the fluctuation suppression circuit adds a load to the power supply path when the external power supply is supplied .

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