JPH025619Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Technical field of invention] This invention relates to a control circuit for equipment that controls the operation of various equipment such as air conditioners. [Technical background of the invention and its problems] Conventionally, there is a control circuit for an air conditioner as shown in FIG. In FIG. 1, 1 is a power plug, and a power circuit 2 is connected to this plug 1. This power supply circuit 2 is composed of a transformer 3 and a constant voltage rectifier circuit 4, and supplies a DC voltage for operation to a main control circuit 5, a relay contact circuit 6, and a controlled control block 7. Main control circuit 5 above
The main unit is a microcomputer, and controls the relay contact circuit 6 according to a preset program, thereby controlling the controlled block 7. One end of an operating switch 9 in the operating section 8 is connected to the positive output line _lP of the power supply circuit 2, and the other end of the operating switch 9 is connected to the main control circuit 5. Note that the negative output line _lo of the power supply circuit 2 is grounded. That is, when the plug 1 is connected to a power outlet (not shown), a DC voltage for operation is supplied from the power supply circuit 2 to the main control circuit 5, the relay contact circuit 6, and the control target block 7. In this state, the operation section 8
When the operation switch 9 is turned on, the voltage obtained at the other end of the operation switch 9 is supplied as an operation command signal to the main control circuit 5, and operation is started. On the other hand, when the operation switch 9 of the operation section 8 is turned off, the other end of the operation switch 9 becomes zero potential, which is supplied as a stop command signal to the main control circuit 5, and the operation is stopped. By the way, in such an air conditioner, if the operation switch 9 is repeatedly turned on and off in a short period of time, that is, if it is started and stopped repeatedly in a short period of time, it is said that the operating equipment such as the compressor will break down. There is a risk. Furthermore, when a plurality of air conditioners as described above are used to air condition a plurality of rooms, it would be convenient if operation and stop control of each air conditioner could be performed centrally at one location. Therefore, it is conceivable to extend the operating switches provided in each air conditioner and provide them all in one place. However, since the operation switch is provided in a low voltage circuit that is symmetrical to electronic circuits such as the main control circuit 5,
It was difficult to extend the operating switch due to low signal levels and noise. [Purpose of the invention] This invention was made in view of the above circumstances, and its purpose is to improve the safety of equipment, enable stable and reliable operation, and also to improve the safety of equipment when multiple equipment is used. In the case of a machine, the objective is to provide a highly practical control circuit for equipment that can perform centralized control or independent control as required. [Summary of the invention] This invention is a device that is equipped with a power supply circuit that is connected to a power source and a main control circuit that performs various operation controls using the output of this power supply circuit as an operating voltage. At the same time, a delay circuit for delaying the rise of the input voltage is connected to the output end of the power supply circuit, and a changeover switch is provided to select one of the output of the operation switch and the output of the delay circuit and supply it to the main control circuit. , the output of the operation switch and the output of the delay circuit are respectively used as operation/stop command signals. [Embodiment of the invention] An embodiment of the invention will be described below with reference to the drawings. In this case, the same parts as in FIG. 1 are given the same reference numerals, and detailed explanation thereof will be omitted. As shown in FIG. 2, devices such as air conditioners A and B are connected to the plug 1, respectively. In air conditioners A and B, the output line of power supply circuit 2
One end of the operation switch 9 in the operation section 8 is connected to l _P , and the other end of this operation switch 9 is connected to the main control circuit 5 via between the fixed contact 10b and the movable contact 10c of the changeover switch 10. . Further, the input terminal of a delay circuit 20 is connected to the positive output line _lP of the power supply circuit 2, and the output terminal of the delay circuit 20 is connected to the fixed contact 10a of the changeover switch 10 and the movable contact 1.
It is connected to the control circuit 5 via the terminal 0c. The delay circuit 20 consists of a NAND circuit 21, inverter circuits 22, 23, capacitors 24, 25, and resistors 26, 27.
The rise of the input voltage is delayed for a certain period of time based on a time constant determined by Here, the operation of the delay circuit 20 will be explained. Now, when the plug 1 is connected to a power outlet, a constant DC voltage is generated in the power supply circuit 2.
At this time, as shown in FIG. 3, as the output voltage of the power supply circuit 2 rises, the voltage at point b also rises, and the voltage at point b exceeds the threshold level after ₁ hour t, and at t ₂ After a period of time, the voltage at point b gradually decreases below the threshold level and stabilizes at a constant level. In this case, by setting the signal below the threshold level as a logic "0" signal and the signal above the threshold level as a logic "1" signal, the following truth values can be obtained at points a, b, c, d, and e. The table holds true.

[Effect of idea]

As mentioned above, this invention improves the safety of the equipment and enables stable and reliable operation, and when there are multiple equipment, it is possible to centrally control them or to control them individually as necessary. Therefore, it is possible to provide a control circuit for a highly practical device that can be used in various applications.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an example of a conventional control circuit.
Figure 2 is a configuration diagram showing an embodiment of this invention;
4 and 4 are diagrams for explaining the operation of the delay circuit in the same embodiment. 2... Power supply circuit, 5... Main control circuit, 8... Operating unit, 9... Operation switch, 10... Changeover switch, 20... Delay circuit, A, B... Air conditioner (equipment).

Claims (1)

[Scope of utility model registration request] In a device equipped with a power supply circuit connected to a power supply and a main control circuit that performs various operation controls using the output of this power supply circuit as an operating voltage, an operation switch connected to an output end of the power supply circuit and an operation switch of the power supply circuit A delay circuit connected to the output terminal and delaying the rise of the output of the power supply circuit, and a changeover switch that selects one of the output of the delay circuit and the output of the operation switch and supplies it to the control section. A control circuit for a device, characterized in that the output of the delay circuit and the output of the operation switch are respectively used as operation/stop command signals.