SU897188A1 - Device for emergency testing of heating circuits of incubator - Google Patents

Description

one

The invention relates to agriculture, in particular, to devices for controlling the heating circuits of incubators.

A device is known for controlling the failure of circuits of heating incubators, which contains heating circuits connected to a current source and a measuring current transducer connected in parallel to the heating circuits 1.

A disadvantage of the known device is low control accuracy. The closest in technical essence to the proposed invention is a device containing sensors for the presence of current in the heating circuits, the first terminals of which are interconnected and connected to the first terminal of the current source 2.

The disadvantage of this device is the low accuracy of control of a separate kg1 of each circuit.

The purpose of the invention. Improving the accuracy of control separately for each circuit.

This goal is achieved by the fact that it is equipped with a heating control unit, a switching node, heating circuit accumulators at two inputs, and a logic unit having a combinational node and a combiner at two inputs.

the output of the heating control unit is connected to the input of the switching unit and the first inputs of the combinational node, the summers of the heating circuits and the adder of the logic unit, the second input of which is connected to the output of the combinational node, the second inputs of the combinational node and the adders of the heating circuits are connected to the outputs

10 current presence sensors and the second terminals of the heating circuits are connected to the second terminal of the current source via the current presence sensors and the switching node. The drawing shows the block diagram of the device for controlling the failure of the heating circuits of the incubator.

The device contains heating circuits 1, switching node 2, heating control unit 3. ,. sensors 4 availability

20 current, totalizer 5 heating circuits, logic unit 6, having combinational node 7, and adder 8 logic unit 6, in which the first terminals of heating circuits 1 are interconnected and connected to the first terminal of the current source, the output of the heating control unit 3 is connected with the input of the switching unit 2 and the spurious inputs of the combinational node 7, the adders 8 of the logic unit 6 and the adders 5 of the heating circuits, the second input of the adder 8 is connected to the output of the combinational node 7, the second inputs of the combinational node 7 and the adders 5 of the heating circuits 1 are connected to the outputs of the sensors 4, the presence of current, and second terminals of the heating circuits 1 through 4, the presence of current sensors and the switching unit 2 is connected to the second terminal of the current source.

The device works as follows.

When you turn on the device, the command unit 3 issues a command signal to the switching node 2. The signal has two logical values. - to turn on heating circuit 1 and logical O - to turn off heating circuit 1. At the same time, the command signal arrives at the combinational node 7, where it participates in the formation of the response signal, as well as at the first input of the adder 8 of the logic unit 6 The logical signals, i.e. a current flows through this heating circuit and a logical O current is absent.

Combination node 7 generates a response signal by the heating circuit 1, which takes a logical value, if at least through one heating circuit 1, if there is a command

.ABOUT

current flows, or esignal

whether through all circuits 1 heating current at the command signal.

If the command signal i and all heating circuits 1 do not simultaneously flow, or if the command signal O and all heating circuits 1 are de-energized, the combinational node 7 generates a response signal having a logical value of O. The adder 8 analyzes the response signal received from the combinational node 7 and a command signal, if there are no logical i or O at both inputs at the same time, then circuit 1 is faulty and adder 8 generates an output signal (alarm signal of heating circuit 1), otherwise circuit 1 is healthy.

For automatic detection of the heating circuits released from the heating circuit 1, there are su; .mators 5, the total number of which is equal to the number of heating circuits 1.

If a current flows through this heating circuit 1 (logical) and

ABOUT

at command signal

or.

through the heating circuit 1 does not flow (logical O), then this adder 8 for this heating circuit 1

gives a logical signal

on

activation of the signal that this heating circuit 1 is faulty.

Thus, the device increases the accuracy of control separately for each heating circuit.

Claims (2)

1. Handbook of electrical appliances. Ed. K.K. Iluenergy 1977, Nina. Leningrad, p. 675. 2. USSR author's certificate number 583400, cl. GOl R 31/02, 1977 (prototype).