Double-isolation control circuit of direct-current electromagnetic pump of fuel oil heater

Abstract

The utility model discloses a double-isolation control circuit of a direct-current electromagnetic pump of a fuel oil warmer, and belongs to the technical field of electromagnetic pump control. Comprising a pulse signal control sub-circuit, the input end of the pulse control sub-circuit is simultaneously connected with a connector and the negative electrode of a diode D7, the positive electrode of the diode D7 is simultaneously connected with the connector and the input end of a direct-current signal control unit, and the direct-current signal control unit comprises a first direct-current signal control sub-circuit and a second direct-current signal control sub-circuit. The output end of the pulse control sub-circuit is connected with the input end of the single-chip microcomputer, the output end of the first direct-current signal control sub-circuit is connected with the input end of the single-chip microcomputer, the output end of the second direct-current signal control sub-circuit is connected with the input end of the single-chip microcomputer, and the output end of the single-chip microcomputer is connected with the input end of the direct-current electromagnetic pump. Under the cooperation of the pulse control sub-circuit, the first direct current signal control sub-circuit and the second direct current signal control sub-circuit, turn-off of the electromagnetic pump is effectively controlled.

Description

Technical Field

[0001] The utility model belongs to the technical field of electromagnetic pump control, and in particular relates to a double isolation control circuit of a DC electromagnetic pump of a fuel heater. Background Art

[0002] Oil heaters are mainly used to generate heat by using oil as fuel and are used for keeping warm. They are light, flexible, small in size, light in weight, powerful, easy to operate, safe and reliable, and use less electricity and oil.

[0003] In the prior art, fuel is supplied to fuel heaters through electromagnetic pumps. However, if the isolation control circuit used in the existing electromagnetic pump control circuit fails, the electromagnetic pump will not work properly and may even leak, causing pollution to the surrounding environment and posing a safety hazard. Utility Model Content

[0004] The purpose of the utility model is to provide a dual isolation control circuit for a DC electromagnetic pump of a fuel heater, which solves the above-mentioned problems existing in the prior art.

[0005] Technical solution: A dual isolation control circuit for a DC electromagnetic pump of a fuel heater, including a pulse signal control subcircuit, the input end of the pulse control subcircuit is simultaneously connected to a connector and the cathode of a diode D7, the anode of the diode D7 is simultaneously connected to a connector and the input end of a DC signal control unit, the DC signal control unit includes a first DC signal control subcircuit and a second DC control subcircuit, the first DC signal control subcircuit and the second DC control subcircuit are connected in parallel to the anode of the diode D7, the output end of the pulse control subcircuit is connected to the input end of a single-chip microcomputer, the output end of the first DC signal control subcircuit is connected to the input end of the single-chip microcomputer, the output end of the second DC signal control subcircuit is connected to the input end of the single-chip microcomputer, and the output end of the single-chip microcomputer is connected to the input end of the DC electromagnetic pump.

[0006] Preferably, the pulse signal control subcircuit includes a resistor R54, a resistor R73, a resistor R20, a resistor R48, a resistor R74, a resistor R25, a diode D12, a transistor QN4 and a field effect transistor Q3, one end of the resistor R54 is connected to the input end of the single chip microcomputer, the other end of the resistor R54 is connected to one end of the resistor R73, the other end of the resistor R73 is simultaneously connected to the cathode of the diode D12, one end of the resistor R20 and the gate of the transistor QN4, the anode of the diode D12 is connected to the gate of the transistor QN4, and the cathode of the diode D12 is connected to the gate of the transistor QN4. The transistor QN4 is connected to the resistor R20 and grounded, the emitter of the transistor QN4 is connected to the resistor R20 and grounded, the collector of the transistor QN4 is connected to one end of the resistor R48, the other end of the resistor R48 is connected to one end of the resistor R74, the other end of the resistor R74 is simultaneously connected to one end of the resistor R25 and the gate of the field effect transistor Q3, the other end of the resistor R25 is simultaneously connected to the source of the field effect transistor Q3 and the input end of the single chip computer, and the drain of the field effect transistor Q3 is connected to the cathode of the diode D7 and the connector.

[0007] Preferably, the transistor QN4 is a MMBT5551 transistor, and the field effect transistor Q3 is a NCE55P15K field effect transistor.

[0008] Preferably, the first DC signal control subcircuit includes a resistor R55, a resistor R19, a resistor R21, a resistor R47, a resistor R23, a resistor R75, a resistor R49, a resistor R41, a transistor QN3, a transistor QP1 and a field effect transistor Q5, one end of the resistor R55 is connected to the input end of the single chip microcomputer, the other end of the resistor R55 is simultaneously connected to one end of the resistor R19 and the gate of the transistor QN3, the other end of the resistor R19 is connected to the emitter of the transistor QN3 and grounded, the collector of the transistor QN3 is simultaneously connected to one end of the resistor R21 and one end of the resistor R47, the resistor R21 The other end of the resistor R47 is connected to the emitter of the transistor QP1, the other end of the resistor R47 is connected to the gate of the transistor QP1, the collector of the transistor QP1 is connected to one end of the resistor R23, one end of the resistor R75 is connected to the other end of the resistor R23, the other end of the resistor R75 is connected to one end of the resistor R49 and the gate of the field effect transistor Q5, one end of the resistor R41 is connected to the other end of the resistor R49 and to ground, the other end of the resistor R41 is connected to the source of the field effect transistor Q5 and the input end of the second DC signal control sub-circuit, and the drain of the field effect transistor Q5 is connected to the anode of the diode D7 and the connector.

[0009] Preferably, the transistor QN3 is a MMBT5551 transistor, the transistor QP1 is a MMBT5401 transistor, and the field effect transistor Q5 is a NCE6020AK field effect transistor.

[0010] Preferably, the second DC signal control subcircuit includes a resistor R22, a resistor R38, a resistor R24, a resistor R76, a resistor R50, a transistor QN7 and a field-effect transistor Q6, one end of the resistor R22 is connected to an external power supply, the other end of the resistor R22 is simultaneously connected to one end of the resistor R38 and the gate of the transistor QN7, the other end of the resistor R38 is connected to the input end of the single-chip microcomputer, the emitter of the transistor QN7 is grounded, the drain of the transistor QN7 is simultaneously connected to one end of the resistor R24 ​​and one end of the resistor R76, the other end of the resistor R24 ​​is connected to the input end of the single-chip microcomputer, the other end of the resistor R76 is simultaneously connected to one end of the resistor R50 and the gate of the field-effect transistor Q6, the other end of the resistor R50 is connected to the source of the field-effect transistor Q6 and to ground, and the drain of the field-effect transistor Q6 is connected to the output end of the first DC signal control subcircuit.

[0011] Preferably, the transistor QN7 is a MMBT5551 transistor, and the field effect transistor Q6 is a NCE6020AK field effect transistor.

[0012] Beneficial effects: The utility model relates to a dual isolation control circuit for a DC electromagnetic pump of a fuel heater. The pulse control subcircuit is connected to the first DC signal control subcircuit and the second DC signal control subcircuit through a diode D7. The diode D7 is used to suppress the reverse pulse generated by the electromagnetic pump. With the cooperation of the pulse control subcircuit, the first DC signal control subcircuit and the second DC signal control subcircuit, when any subcircuit fails, the other two subcircuits cooperate to effectively control the shutdown of the electromagnetic pump, thereby effectively controlling the danger generated by the electromagnetic pump in the event of failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the control circuit diagram of the utility model. DETAILED DESCRIPTION

[0014] like Figure 1As shown, the utility model provides a technical solution: a dual isolation control circuit of a DC electromagnetic pump for a fuel heater, comprising a pulse signal control subcircuit, wherein the input end of the pulse control subcircuit is simultaneously connected to a connector and the cathode of a diode D7, and the anode of the diode D7 is simultaneously connected to a connector and the input end of a DC signal control unit, and the DC signal control unit comprises a first DC signal control subcircuit and a second DC control subcircuit, wherein the first DC signal control subcircuit and the second DC control subcircuit are connected in parallel to the anode of the diode D7, and the output end of the pulse control subcircuit is connected to the input end of a single-chip microcomputer, and the first DC signal control subcircuit is connected to the anode of the diode D7. The output end of the circuit is connected to the input end of the single-chip microcomputer, the output end of the second DC signal control sub-circuit is connected to the input end of the single-chip microcomputer, the output end of the single-chip microcomputer is connected to the input end of the DC electromagnetic pump, the pulse control sub-circuit is connected to the first DC signal control sub-circuit and the second DC signal control sub-circuit via a diode D7, and the diode D7 is used to suppress the reverse pulse generated by the electromagnetic pump. With the cooperation of the pulse control sub-circuit, the first DC signal control sub-circuit and the second DC signal control sub-circuit, when any one of the sub-circuits fails, the other two sub-circuits cooperate to effectively control the shutdown of the electromagnetic pump, thereby effectively controlling the danger generated by the electromagnetic pump in the event of failure.

[0015] In a further embodiment, the pulse signal control subcircuit includes a resistor R54, a resistor R73, a resistor R20, a resistor R48, a resistor R74, a resistor R25, a diode D12, a transistor QN4 and a field effect transistor Q3, wherein the transistor QN4 adopts a transistor of the MMBT5551 model, and the field effect transistor Q3 adopts a field effect transistor of the NCE55P15K model. One end of the resistor R54 is connected to the input end of the single-chip microcomputer, and the other end of the resistor R54 is connected to one end of the resistor R73. The other end of the resistor R73 is simultaneously connected to the negative electrode of the diode D12, the resistor One end of R20 is connected to the gate of the transistor QN4, the positive electrode of the diode D12 is connected to the resistor R20 and is grounded, the emitter of the transistor QN4 is connected to the resistor R20 and is grounded, the collector of the transistor QN4 is connected to one end of the resistor R48, the other end of the resistor R48 is connected to one end of the resistor R74, the other end of the resistor R74 is simultaneously connected to one end of the resistor R25 and the gate of the field effect transistor Q3, the other end of the resistor R25 is simultaneously connected to the source of the field effect transistor Q3 and the input end of the microcontroller, and the drain of the field effect transistor Q3 is connected to the cathode of the diode D7 and the connector.

[0016] In a further embodiment, the first DC signal control subcircuit includes a resistor R55, a resistor R19, a resistor R21, a resistor R47, a resistor R23, a resistor R75, a resistor R49, a resistor R41, a transistor QN3, a transistor QP1 and a field effect transistor Q5, wherein the transistor QN3 is a transistor of the MMBT5551 model, the transistor QP1 is a transistor of the MMBT5401 model, and the field effect transistor Q5 is a field effect transistor of the NCE6020AK model. One end of the resistor R55 is connected to the input end of the single-chip microcomputer, and the other end of the resistor R55 is connected to one end of the resistor R19 and the gate of the transistor QN3 at the same time. The other end of the resistor R19 is connected to the emitter of the transistor QN3 and is grounded. The collector of the transistor QN3 is connected to one end of the resistor R21 and one end of the resistor R47. The other end of the resistor R21 is connected to the emitter of the transistor QP1. The other end of the resistor R47 is connected to the gate of the transistor QP1. The collector of the transistor QP1 is connected to one end of the resistor R23. One end of the resistor R75 is connected to the other end of the resistor R23. The other end of the resistor R75 is connected to one end of the resistor R49 and the gate of the field-effect transistor Q5. One end of the resistor R41 is connected to the other end of the resistor R49 and to ground. The other end of the resistor R41 is connected to the source of the field-effect transistor Q5 and the input end of the second DC signal control sub-circuit. The drain of the field-effect transistor Q5 is connected to the anode of the diode D7 and the connector.

[0017] In a further embodiment, the second DC signal control subcircuit includes a resistor R22, a resistor R38, a resistor R24, a resistor R76, a resistor R50, a transistor QN7 and a field effect transistor Q6, wherein the transistor QN7 is a MMBT5551 transistor, and the field effect transistor Q6 is a NCE6020AK field effect transistor. One end of the resistor R22 is connected to an external power supply, and the other end of the resistor R22 is connected to one end of the resistor R38 and the gate of the transistor QN7. The other end of R38 is connected to the input end of the single-chip microcomputer, the emitter of the transistor QN7 is grounded, the drain of the transistor QN7 is connected to one end of the resistor R24 ​​and one end of the resistor R76, the other end of the resistor R24 ​​is connected to the input end of the single-chip microcomputer, the other end of the resistor R76 is connected to one end of the resistor R50 and the gate of the field-effect transistor Q6, the other end of the resistor R50 is connected to the source of the field-effect transistor Q6 and is grounded, and the drain of the field-effect transistor Q6 is connected to the output end of the first DC signal control sub-circuit.

[0018] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the scope of protection of the present invention.

Claims

1. A double isolation control circuit for a DC electromagnetic pump of a fuel heater, characterized in that: It includes a pulse signal control subcircuit, the input end of the pulse control subcircuit is simultaneously connected to the connector and the cathode of the diode D7, the anode of the diode D7 is simultaneously connected to the connector and the input end of the DC signal control unit, the DC signal control unit includes a first DC signal control subcircuit and a second DC control subcircuit, the first DC signal control subcircuit and the second DC control subcircuit are connected in parallel to the anode of the diode D7, the output end of the pulse control subcircuit is connected to the input end of the single-chip microcomputer, the output end of the first DC signal control subcircuit is connected to the input end of the single-chip microcomputer, the output end of the second DC signal control subcircuit is connected to the input end of the single-chip microcomputer, and the output end of the single-chip microcomputer is connected to the input end of the DC electromagnetic pump.

2. The double isolation control circuit of a DC electromagnetic pump for a fuel heater according to claim 1, characterized in that: The pulse signal control subcircuit includes a resistor R54, a resistor R73, a resistor R20, a resistor R48, a resistor R74, a resistor R25, a diode D12, a transistor QN4 and a field effect transistor Q3. One end of the resistor R54 is connected to the input end of the single chip microcomputer, the other end of the resistor R54 is connected to one end of the resistor R73, the other end of the resistor R73 is simultaneously connected to the cathode of the diode D12, one end of the resistor R20 and the gate of the transistor QN4, the anode of the diode D12 is connected to the input end of the single chip microcomputer, and the other end of the resistor R54 is connected to one end of the resistor R73. The other end of the resistor R73 is simultaneously connected to the cathode of the diode D12, one end of the resistor R20 and the gate of the transistor QN4. The anode of the diode D12 is connected to the input end of the single chip microcomputer. The transistor QN4 is connected to the resistor R20 and grounded, the emitter of the transistor QN4 is connected to the resistor R20 and grounded, the collector of the transistor QN4 is connected to one end of the resistor R48, the other end of the resistor R48 is connected to one end of the resistor R74, the other end of the resistor R74 is simultaneously connected to one end of the resistor R25 and the gate of the field effect transistor Q3, the other end of the resistor R25 is simultaneously connected to the source of the field effect transistor Q3 and the input end of the single chip microcomputer, and the drain of the field effect transistor Q3 is connected to the cathode of the diode D7 and the connector.

3. The double isolation control circuit of a DC electromagnetic pump for a fuel heater according to claim 2, characterized in that: The transistor QN4 is a MMBT5551 transistor, and the field effect transistor Q3 is a NCE55P15K field effect transistor.

4. The double isolation control circuit of a DC electromagnetic pump for a fuel heater according to claim 1, characterized in that: The first DC signal control subcircuit includes a resistor R55, a resistor R19, a resistor R21, a resistor R47, a resistor R23, a resistor R75, a resistor R49, a resistor R41, a transistor QN3, a transistor QP1 and a field effect transistor Q5. One end of the resistor R55 is connected to the input end of the single-chip microcomputer, and the other end of the resistor R55 is connected to one end of the resistor R19 and the gate of the transistor QN3. The other end of the resistor R19 is connected to the emitter of the transistor QN3 and grounded. The collector of the transistor QN3 is connected to one end of the resistor R21 and one end of the resistor R47. The other end of the resistor R21 is connected to the emitter of the transistor QN3 and grounded. One end of the resistor R47 is connected to the emitter of the transistor QP1, the other end of the resistor R47 is connected to the gate of the transistor QP1, the collector of the transistor QP1 is connected to one end of the resistor R23, one end of the resistor R75 is connected to the other end of the resistor R23, the other end of the resistor R75 is connected to one end of the resistor R49 and the gate of the field-effect transistor Q5, one end of the resistor R41 is connected to the other end of the resistor R49 and to ground, the other end of the resistor R41 is connected to the source of the field-effect transistor Q5 and the input end of the second DC signal control sub-circuit, and the drain of the field-effect transistor Q5 is connected to the anode of the diode D7 and the connector.

5. The double isolation control circuit of a DC electromagnetic pump for a fuel heater according to claim 4, characterized in that: The transistor QN3 is a MMBT5551 transistor, the transistor QP1 is a MMBT5401 transistor, and the field effect transistor Q5 is a NCE6020AK field effect transistor.

6. The double isolation control circuit of a DC electromagnetic pump for a fuel heater according to claim 1, characterized in that: The second DC signal control subcircuit includes a resistor R22, a resistor R38, a resistor R24, a resistor R76, a resistor R50, a transistor QN7, and a field-effect transistor Q6. One end of the resistor R22 is connected to an external power supply, the other end of the resistor R22 is connected to one end of the resistor R38 and the gate of the transistor QN7, the other end of the resistor R38 is connected to the input end of the single-chip microcomputer, the emitter of the transistor QN7 is grounded, the drain of the transistor QN7 is connected to one end of the resistor R24 ​​and one end of the resistor R76, the other end of the resistor R24 ​​is connected to the input end of the single-chip microcomputer, the other end of the resistor R76 is connected to one end of the resistor R50 and the gate of the field-effect transistor Q6, the other end of the resistor R50 is connected to the source of the field-effect transistor Q6 and to ground, and the drain of the field-effect transistor Q6 is connected to the output end of the first DC signal control subcircuit.

7. The double isolation control circuit of a DC electromagnetic pump for a fuel heater according to claim 6, characterized in that: The transistor QN7 is a MMBT5551 transistor, and the field effect transistor Q6 is a NCE6020AK field effect transistor.

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