JPS6343212U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention, FIG. 2 is a circuit diagram showing details of the control section 2 in FIG. 1, and FIG. 3 is a detected pressure and output voltage of the pressure detection means 21. FIG. 4 is a diagram showing the operation of each part in the control circuit 22 and the switch circuit 23, and FIG. 4a is a graph showing the relationship between pressure detection circuit I.
Figure b shows the change in the output voltage of operational amplifier OP ₁ (solid line) and input voltage of operational amplifier OP ₁ (dotted line); Figure c shows the change in the output of operational amplifier OP ₁ ; Figure c shows the change in the output voltage of operational amplifier OP ₁ ;
Figure d is a diagram showing changes in the output of Tr ₁ , Figure e is a diagram showing changes in the output of Tr ₁ , Figure f is a diagram showing changes in the output of Tr 2, Figure g is a diagram showing changes in the output of Tr ₂ .
_Figure h is a diagram showing the output change of Tr ₄ , and Figure i is a diagram showing the operating state of the motor 13. 1... Compressor section, 2... Pressure control section, 11
... pressurized air storage tank, 12 ... pump, 13 ... motor, 14 ... power supply, 15 ... switch, 21 ... pressure detection means, 22 ... control circuit, 23 ... switch circuit, 24 ... electromagnetic drive source, 25 ... power supply.

Claims (1)

[Claims for Utility Model Registration] (1) Detecting the tank pressure of a compressor that has a pump, a motor that drives the pump, and a tank that accommodates pressurized air discharged from the pump, and responding to the detected pressure. a pressure detecting means for sending out an output of the pressure detecting means; and a pressure detecting means for inputting the output of the pressure detecting means and sending out a first output signal when the output value of the pressure detecting means is smaller than a first value; a control circuit that sends out a second output signal when the output value is larger than a second value; and a compressor that receives the output of the control circuit and sends out the first output signal when the control circuit is sending out the first output signal. a switch circuit that turns on an electromagnetic drive source that drives a power switch of the motor and turns off the electromagnetic drive source when the control circuit is sending out a second output signal; One end of the drive source is connected to the negative side of a power source that drives the electromagnetic drive source, and the other end of this electromagnetic drive source is connected to an NPN
A compressor connected to an emitter of a transistor, further having a collector of the NPN transistor connected to the positive side of the power supply, and a pre-stage circuit for driving the NPN transistor being a grounded emitter circuit of the PNP transistor. pressure control device. (2) A delay circuit that delays the output signal of the first stage circuit and sends it to the first stage circuit is provided between the first stage circuit that drives the NPN transistor and the first stage circuit that drives the first stage circuit. A pressure control device for a compressor according to claim 1, which is a utility model. (3) The control circuit includes a first operational amplifier that sends out a high output when the output of the pressure detection circuit is below a certain value, and sends out a low output when the output exceeds the certain value; a second operational amplifier that receives the output of the operational amplifier, sends out a low output when the output of the first operational amplifier is high, and sends out a high output when the output of the first operational amplifier is low; and,
first and second diodes whose positive terminals are respectively connected to the output terminal of the second operational amplifier, and between the negative terminal of the first diode and the input terminal of the first operational amplifier; and a resistor whose one end is connected to the connection midpoint of the first and second diodes and whose other end is connected to the power supply, and the negative terminal of the second diode is connected to a constant voltage. connected to a voltage power source, the resistor is connected to the first
The pressure control device for a compressor according to claim 1 or 2, wherein the negative side voltage of the diode has a value equal to the voltage of the constant voltage power supply. .