Control circuit of vacuum pump

Abstract

The control circuit comprises a control chip U1, a 5V power supply chip U3, a pressure sensor U4, a programming port SL, a 12V power supply positive electrode input end VCC12V and a grounding end GND, the input end of the 5V power supply chip U3 is connected with the 12V power supply positive electrode input end VCC12V, and the 5V output end of the 5V power supply chip U3 is connected with a VDD pin of the control chip U1, a fourth pin of the programming port SL and a VDD pin of the pressure sensor U4; and an OUT pin of the pressure sensor U4 is connected with a pin 16 of an IO input port of the control chip U1. The vacuum pump control circuit can effectively solve the problems that when the positive electrode and the negative electrode of the power supply are reversely connected, the control circuit is easy to burn out and the service life is influenced because the reverse connection protection is not arranged in the conventional vacuum pump control circuit.

Description

TECHNICAL FIELD

[0001] The utility model relates to a vacuum pump field especially relates to a control circuit of vacuum pump. BACKGROUND

[0002] The control circuit of vacuum pump, when the misoperation such as power reverse connection, will appear the problem of burning control circuit, influence the service life of vacuum pump. SUMMARY

[0003] The utility model discloses a control circuit of vacuum pump, solve the control circuit of vacuum pump currently, when the positive and negative pole of power reverse connection, because do not set up reverse connection protection, and easy to appear the problem of burning control circuit, influence service life.

[0004] The utility model discloses a control circuit of vacuum pump, including control chip U1, 5V power supply chip U3, pressure sensor U4, burning mouth SL, 12V power supply positive input VCC12V, ground terminal GND, the input of 5V power supply chip U3 and 12V power supply positive input VCC12V are connected, and the 5V output of 5V power supply chip U3 and the VDD foot of control chip U1, the 4 foot of burning mouth SL, the VDD foot of pressure sensor U4 are connected, the OUT foot of pressure sensor U4 and the IO input 16 foot of control chip U1, the 2 foot of burning mouth SL is connected with the data input 19 foot of control chip U1, and the 3 foot is connected with the clock input 18 foot of control chip U1, and the 4 foot is connected with ground terminal GND, still including the third diode D3, the anode of third diode D3 and 12V power supply positive input VCC12V are connected, and the input of 5V power supply chip U3 is connected with the cathode.

[0005] Further, still including alarm signal output OUT2, first triode Q1, fourteenth resistance R14, eighth resistance R8, the base of first triode Q1 and control chip U1's 17 foot are connected, the emitter and ground terminal GND are connected, the collector is connected with 12V power supply positive input VCC12V through fourteenth resistance R14, and alarm signal output OUT2 is connected with the collector of first triode Q1 through eighth resistance R8.

[0006] Further, still including signal output OUT1, second triode Q2, third triode Q3, fourth MOS tube Q4, fifth MOS tube Q5,

[0007] The base of second triode Q2 and control chip U1's 15 foot are connected, the emitter and ground terminal GND are connected, and the collector and 12V power supply positive input VCC12V are connected;

[0008] The base of the third triode Q3 is connected with the collector of the second triode Q2, the emitter is connected with the positive input terminal VCC12V of the 12V power supply, and the collector is connected with the gate of the fourth MOS tube Q4; the source of the fourth MOS tube Q4 is connected with the signal output terminal OUT1, the signal output terminal OUT1 is used for being connected with the negative electrode of the vacuum pump; the drain of the fourth MOS tube Q4 is connected with the drain of the fifth MOS tube Q5;

[0009] The gate of the fifth MOS tube Q5 is connected with the positive input terminal VCC12V of the 12V power supply, and the source is connected with the ground terminal GND;

[0010] The first diode D1 is further included, the positive electrode of the first diode D1 is connected with the signal output terminal OUT1

[0011] The negative electrode is connected with the positive input terminal VCC12V of the 12V power supply.

[0012] The utility model discloses the beneficial effects of realizing the reverse connection protection of 5V power supply chip U3 circuit part through the third diode D3.

[0013] Through the mutual cooperation of the second diode Q2, the third diode Q3, the fourth MOS tube Q4 and the fifth MOS tube Q5, the circuit protection of the output signal part circuit when the positive and negative of VCC12V are reversely connected is realized.

[0014] The utility model discloses the vacuum pump control circuit of solving prior art, when the positive and negative of power supply are reversely connected, because not setting reverse connection protection, and easily appearing burnt control circuit, the problem of influencing service life.

[0015] The utility model will be more detailed through embodiment. DRAWINGS

[0016] Fig. 1 It is the circuit diagram of the V power supply chip part of the utility model.

[0017] Fig. 2 It is the partial circuit diagram of control chip U1.

[0018] Fig. 3 It is the circuit diagram of control signal output part. CONCRETE IMPLEMENTING METHOD

[0019] Embodiment, such as Figs. 1 to 3The control circuit of the vacuum pump shown includes a control chip U1, a 5V power supply chip U3, a pressure sensor U4, a burning port SL, a 12V power supply positive input terminal VCC12V, a ground terminal GND, the input terminal of the 5V power supply chip U3 is connected with the 12V power supply positive input terminal VCC12V, the 5V output terminal of the 5V power supply chip U3 is connected with the VDD pin of the control chip U1, the 4 pin of the burning port SL, and the VDD pin of the pressure sensor U4; the OUT pin of the pressure sensor U4 is connected with the IO input port 16 pin of the control chip U1, the 2 pin of the burning port SL is connected with the data input port 19 pin of the control chip U1, the 3 pin is connected with the clock input port 18 pin of the control chip U1, and the 4 pin is connected with the ground terminal GND; further including a third diode D3, the positive terminal of the third diode D3 is connected with the 12V power supply positive input terminal VCC12V, and the negative terminal is connected with the input terminal of the 5V power supply chip U3.

[0020] Further including an alarm signal output terminal OUT2, a first triode Q1, a fourteenth resistor R14, and an eighth resistor R8, the base of the first triode Q1 is connected with the 17 pin of the control chip U1, the emitter is connected with the ground terminal GND, the collector is connected with the 12V power supply positive input terminal VCC12V through the fourteenth resistor R14, and the alarm signal output terminal OUT2 is connected with the collector of the first triode Q1 through the eighth resistor R8.

[0021] Further including a signal output terminal OUT1, a second triode Q2, a third triode Q3, a fourth MOS tube Q4, and a fifth MOS tube Q5,

[0022] The base of the second triode Q2 is connected with the 15 pin of the control chip U1, the emitter is connected with the ground terminal GND, and the collector is connected with the 12V power supply positive input terminal VCC12V;

[0023] The base of the third triode Q3 is connected with the collector of the second triode Q2, the emitter is connected with the 12V power supply positive input terminal VCC12V, and the collector is connected with the gate of the fourth MOS tube Q4; the source of the fourth MOS tube Q4 is connected with the signal output terminal OUT1, the signal output terminal OUT1 is used to be connected with the negative electrode of the vacuum pump; the drain of the fourth MOS tube Q4 is connected with the drain of the fifth MOS tube Q5;

[0024] The gate of the fifth MOS tube Q5 is connected with the 12V power supply positive input terminal VCC12V, and the source is connected with the ground terminal GND;

[0025] Further including a first diode D1, the positive terminal of the first diode D1 is connected with the signal output terminal OUT1, and the negative terminal is connected with the 12V power supply positive input terminal VCC12V.

[0026] The above is only an exemplary description of the present application. Obviously, the present application is not limited to the above-mentioned manner. As long as various non-essential improvements are made using the method concept and technical solution of the present application, or the above-mentioned concept and technical solution of the present application is directly applied to other occasions without improvement, it is within the protection scope of the present application.

Claims

1. A control circuit of a vacuum pump, comprising a control chip (U1), a 5V power supply chip (U3), a pressure sensor (U4), a burning writing port (SL), a 12V power supply positive input end (VCC12V), a ground end GND, an input end of the 5V power supply chip (U3) connected with the 12V power supply positive input end (VCC12V), a 5V output end of the 5V power supply chip (U3) connected with a VDD pin of the control chip (U1), a 4 pin of the burning writing port (SL), and a VDD pin of the pressure sensor (U4); an OUT pin of the pressure sensor (U4) connected with an IO input port 16 pin of the control chip (U1), a 2 pin of the burning writing port (SL) connected with a data input port 19 pin of the control chip (U1), a 3 pin connected with a clock input port 18 pin of the control chip (U1), and a 4 pin connected with the ground end GND; characterized in that: The third diode (D3) is further included, the positive pole of the third diode (D3) is connected with the 12V power supply positive pole input end (VCC12V), and the negative pole is connected with the input end of the 5V power supply chip (U3).

2. The control circuit of a vacuum pump according to claim 1, characterized in that: The alarm signal output end (OUT2), the first triode (Q1), the fourteenth resistance (R14) and the eighth resistance (R8) are further included, the base of the first triode (Q1) is connected with the 17th pin of the control chip (U1), the emitter is connected with the ground terminal GND, the collector is connected with the 12V power supply positive pole input end (VCC12V) through the fourteenth resistance (R14), the alarm signal output end (OUT2) is connected with the collector of the first triode (Q1) through the eighth resistance (R8).

3. Control circuit of a vacuum pump according to claim 1 or 2, characterized in that: The signal output end (OUT1), the second triode (Q2), the third triode (Q3), the fourth MOS tube (Q4) and the fifth MOS tube (Q5) are further included, The base of the second triode (Q2) is connected with the 15th pin of the control chip (U1), the emitter is connected with the ground terminal GND, and the collector is connected with the 12V power supply positive pole input end (VCC12V); The base of the third triode (Q3) is connected with the collector of the second triode (Q2), the emitter is connected with the 12V power supply positive pole input end (VCC12V), and the collector is connected with the gate of the fourth MOS tube (Q4); the source of the fourth MOS tube (Q4) is connected with the signal output end (OUT1), and the signal output end (OUT1) is used to be connected with the negative pole of the vacuum pump; the drain of the fourth MOS tube (Q4) is connected with the drain of the fifth MOS tube (Q5); The gate of the fifth MOS tube (Q5) is connected with the 12V power supply positive pole input end (VCC12V), and the source is connected with the ground terminal GND; The first diode (D1) is further included, the positive pole of the first diode (D1) is connected with the signal output end (OUT1) The negative pole is connected with the 12V power supply positive pole input end (VCC12V).

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