Patent RU-2700273-C2 (RU)
Title: Power control device
Inventor: SMIRNOV ALEKSEJ VLADIMIROVICH
IPC: H02H3/20
Filed: 2018-02-19
Granted: 2019-09-16
Abstract: FIELD: electrical engineering. 
     SUBSTANCE: invention relates to electrical engineering, in particular, can be used for power control in electric appliances. Device for controlling power comprises a protection circuit, which includes a stabilitron, a first resistor and a thyristor, a control circuit including an analogue-to-digital converter (ADC), a first control relay, a load, one terminal of which is connected to one of the thyristor outputs, additionally a controlled power supply is introduced, alarm unit, the protection circuit includes a diode bridge and a fuse, the first output of which is connected to the first terminal of the second contact group of the first relay, the second output of which is connected to the positive terminal of the controlled supply source, and the second output of the fuse is connected to the first output of the diode bridge, the second output of which is connected to the negative terminal of the regulated power supply, the third positive polarity and fourth negative polarity outputs of diode bridge are connected through parallel connected first resistor and stabilotron to thyristor control input, which anode is connected to the first lead of the diode bridge and the first terminal of the load, the cathode - to the negative terminal of the regulated power supply and the second output of the diode bridge. Additionally, there is a second resistor, the first lead of which is connected to the second output of the load and the negative terminal of the measuring input of the analogue-to-digital converter, the positive terminal of which is connected to the second output of the second resistor and a thyristor cathode, the control circuit further includes a button, an unregulated power supply, a power supply unit, a second relay, a third and a fourth resistor, a third, fourth relay, the first winding outputs of which are connected to the digital outputs of the ADC through the third and fourth resistor, respectively, the second outputs being connected to positive output of power supply unit, first leads of contact groups of the third and fourth relays are connected to the first output of the second relay winding, to the positive terminal of the alarm unit, the second outputs are connected to the positive output of the power supply unit, the negative output of which is connected to the second outputs of windings of the first, second, relay, negative ADC power supply terminals, signalling unit and uncontrolled power supply, positive terminal of which is connected to ADC supply positive terminal, to input of power supply unit, with the first terminal of the button and with the first terminal of the first contact group of the first relay, the second output of which is connected to the first terminal of the contact group of the second relay, and the second terminal of this contact group is connected to the second terminal of the button and the first output of the winding of the first relay. 
     EFFECT: achieved technical result is providing protection, limiting value of supply voltage load, disconnection of supply in case of short circuit or break in load circuit, equipment of signalling device. 
     1 cl, 1 dwg