JPS5899030A - Controller - Google Patents

Abstract

PURPOSE:To prevent the generation of mechanical sound, by providing two isolating transformers, connecting an AC power supply to the primary winding of one transformer of them, providing a turn-on and-off controlling element at the secondary winding and providing a signal detecting circuit at the secondary winding of the other transformer. CONSTITUTION:An AC power supply 6 is connected to the primary winding of an insulation transformer 7 and the secondary winding is connected to the primary winding of an insulation transformer 9 via a control element 8. The turning-on/off of the element 8 is controlled by a control circuit 10. The secondary winding of the transformer 9 is connected to a circuit 12 to be controlled by a signal detecting circuit 11. The circuit 10 turns on and off the element, the turning-on/off is detected at the circuit 11 and the circuit 12 can be controlled. Thus, the circuit to be controlled can be controlled in insulated state, and since no mechanical switch such as a relay is employed, the generation of mechanical sound can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to provide a control device that can control a controlled circuit that requires insulation without using a mechanical switch such as a relay.

Figure 1 shows a conventional control device, in which a DC power supply 1
is connected to the coil of the relay 4 via the control element 2, and the output of the control circuit 3 controls the on/off of the control element 2, thereby controlling the on/off of the contacts of the relay 4. Since this device uses a relay 4, it has the disadvantage of producing mechanical noise.

Therefore, the present invention aims to provide a device that does not generate mechanical noise, and embodiments of the present invention will be described below with reference to the drawings.

The primary winding of a transformer 7 whose primary winding and secondary winding are insulated is connected to an AC power supply 6. The secondary winding of the transformer 7 is connected via the control element 8 to the primary winding of a transformer 90 in which the primary winding and the secondary winding are insulated.

On/off of the control element 8 is controlled by a control circuit 1o. The secondary winding of the transformer 9 is connected to a controlled circuit 12 via a signal detection circuit 11 .

With this configuration, when the control circuit 10 turns the control element 8 on and off, the signal detection circuit 11 detects the on/off state, and the controlled circuit 12 can be controlled. In this case, since two transformers are used, control can be performed in an insulated state.

As described above, according to the present invention, the controlled circuit can be controlled in an insulated state, and since no mechanical switch such as a relay is used, no mechanical noise is generated.

[Brief explanation of drawings]

Figure 1 is a block diagram of a conventional control device;
The figure is a block diagram of a control device in an embodiment of the present invention. 6... AC power supply, 7,9... Transformer,
8...Control element, 1o...Control circuit,
11... Signal detection circuit, 12... Controlled circuit. Name of agent: Patent attorney Toshio Nakao and one other person
Figure 1 Figure 2

Claims (1)

[Claims] Two transformers are provided in which the primary winding and the secondary winding are insulated, and the primary winding of one transformer is connected to an AC power source, and the secondary winding of the same transformer is connected to the other through a control element. A control device comprising a control circuit connected to a primary winding of a transformer to control on/off of the antibacterial element, and a controlled circuit connected to the secondary winding of the other transformer via a signal detection circuit.