CN213990137U - AC/DC current-limiting electronic switch - Google Patents
AC/DC current-limiting electronic switch Download PDFInfo
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- CN213990137U CN213990137U CN202023042827.9U CN202023042827U CN213990137U CN 213990137 U CN213990137 U CN 213990137U CN 202023042827 U CN202023042827 U CN 202023042827U CN 213990137 U CN213990137 U CN 213990137U
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Abstract
The utility model relates to an electronic switch, in particular to an AC/DC current-limiting electronic switch; the current limiting control circuit is connected with the control ends of the first MOS main power circuit and the second MOS main power circuit through the MOS drive circuit, when the main power circuit is over-current, the current limiting control circuit acts, and the MOS tube drive voltage is controlled to further adjust the conduction resistance of the MOS tube to limit the current; the utility model is a current-limiting electronic switch, which is not only suitable for DC equipment, but also suitable for AC equipment, the current-limiting real-time performance is good, and the safety and reliability of the equipment are improved; furthermore, the utility model discloses simple reliable, low cost has good application prospect.
Description
Technical Field
The utility model relates to an electronic switch especially relates to an alternating current-direct current-limiting electronic switch.
Background
The electronic switch is an operation unit for realizing circuit on-off by utilizing an electronic circuit and a power electronic device, the traditional electronic switch only plays a role of switching, and has no limit effect on peak current or high-amplitude current at the moment of starting electronic equipment and overload and short-circuit current in the working process, which can influence the stable operation of the electronic equipment and even cause equipment damage, so the electronic switch capable of inhibiting starting impact current appears, but only plays a role at the moment of starting, is only suitable for direct-current equipment, and needs to be improved aiming at the defects.
Disclosure of Invention
In order to solve the problem, the utility model provides an alternating current-direct current-limiting electronic switch.
The technical scheme of the invention is as follows:
the utility model provides an alternating current-direct current-limiting electronic switch, includes first MOS main power circuit, current sampling circuit, second MOS main power circuit, current-limiting control circuit and MOS drive circuit, first MOS main power circuit passes through current sampling circuit and is connected with second MOS main power circuit, current sampling circuit output links to each other with the current-limiting control circuit input, current-limiting control circuit output links to each other with MOS drive circuit input, MOS drive circuit output links to each other with first MOS main power circuit and second MOS main power circuit's control end.
Further, the first MOS main power circuit includes a transistor Q1, a diode D1, and a resistor R1, one end of the resistor R1 is connected to the base of the transistor Q1, the other end of the resistor R1 is connected to the anode of the diode D1 and the source of the transistor Q1 in parallel and then connected to the current sampling circuit 2, and the cathode of the diode D1 is connected to the drain of the transistor Q1 in parallel and then connected to the port N1.
Further, the current sampling circuit comprises a resistor R3, wherein one end of the resistor R3 is connected with the first MOS main power circuit, and the other end of the resistor R3 is connected with the second MOS main power circuit.
Further, the second MOS main power circuit includes a transistor Q2, a diode D2, and a resistor R2, one end of the resistor R2 is connected to the base of the transistor Q2, the other end of the resistor R2 is connected to the anode of the diode D2 and the source of the transistor Q2 in parallel and then connected to the current sampling circuit 2, and the cathode of the diode D2 is connected to the drain of the transistor Q2 in parallel and then connected to the port N3.
Further, the current-limiting control circuit includes an operational amplifier U1, an operational amplifier U2, an operational amplifier U3, an operational amplifier U4, a diode D4, a resistor R4 and a resistor R4, one end of the resistor R4 is connected in parallel with one end of the resistor R4 and then connected to a current sampling circuit, the other end of the resistor R4 is connected in parallel with one end of the resistor R4 and then connected to an inverting input terminal of the operational amplifier U4, the other end of the resistor R4 is connected in parallel with an anode of the diode D4 and then connected to an output terminal of the operational amplifier U4, one end of the resistor R4 is connected to a control ground, the other end of the resistor R4 is connected to a non-inverting input terminal of the operational amplifier U4, one end of the resistor R4 is connected to a GND terminal of the operational amplifier 4 and then connected to an inverting input terminal of the operational amplifier 4, the other end of the resistor R9 is connected in parallel with the anode of the diode D4 and then connected to the output end of the operational amplifier U2, one end of the resistor R8 is connected to the current sampling circuit, the other end of the resistor R8 is connected to the non-inverting input end of the operational amplifier U2, the cathode of the diode D3 is connected in parallel with the cathode of the diode D4 and then connected to one end of the resistor R10, the other end of the resistor R10 is connected to the non-inverting input end of the operational amplifier U3, the inverting input end of the operational amplifier U3 is connected to the output end of the operational amplifier U3 and then connected to one end of the resistor R13, the other end of the resistor R13 is connected in parallel with one end of the resistor R14 and then connected to the inverting input end of the operational amplifier U4, the other end of the resistor R14 is connected to one end of the resistor R15 and then connected to the output end of the operational amplifier U4, and the other end of the resistor R15 is connected to the input end of the MOS drive circuit, one end of the resistor R11 is connected with a control power supply +15V, the other end of the resistor R12 is connected with the non-inverting input end of the operational amplifier after being connected in parallel, and the other end of the resistor R12 is connected with a control ground GND 2.
Further, the MOS drive circuit comprises a transistor Q3 and a transistor Q4, a collector of the transistor Q3 is connected with a +15V power supply, a base of the transistor Q4 is connected with the current-limiting control circuit after being connected in parallel, an emitter of the transistor Q4 is connected with control ends of the first MOS main power circuit and the second MOS main power circuit after being connected in parallel, and a collector of the transistor Q4 is connected with a control ground GND 2.
Further, the transistor Q1 is an N-channel enhancement mode field effect transistor.
Further, the transistor Q2 is an N-channel enhancement mode field effect transistor.
Further, the transistor Q3 is an NPN bipolar transistor.
Further, the transistor Q4 is a PNP bipolar transistor.
The utility model has the advantages that: the utility model relates to an alternating current-direct current-limiting electronic switch both is applicable to DC equipment and is applicable to AC equipment again to both can restrict and start pulse surge current in the twinkling of an eye and can restrict the short-circuit current in the working process.
Drawings
Fig. 1 is a schematic diagram of a square frame structure of the present invention;
fig. 2 is a schematic diagram of the circuit principle of the present invention.
Detailed Description
The invention will be further explained with reference to the following drawings and specific embodiments:
referring to fig. 1 and 2, an alternating current-direct current limiting electronic switch comprises a first MOS main power circuit 1, a current sampling circuit 2, a second MOS main power circuit 3, a current limiting control circuit 4 and an MOS drive circuit 5, wherein the first MOS main power circuit 1 is connected with the second MOS main power circuit 3 through the current sampling circuit 2, the output of the current sampling circuit 2 is connected with the input of the current limiting control circuit 4, the output of the current limiting control circuit 4 is connected with the input of the MOS drive circuit 5, and the output of the MOS drive circuit 5 is connected with the control ends of the first MOS main power circuit 1 and the second MOS main power circuit 3.
As a preferred embodiment of the present invention, the first MOS main power circuit 1 includes a transistor Q1, a diode D1, and a resistor R1, one end of the resistor R1 is connected to the base of the transistor Q1, the other end of the resistor R1 is connected to the current sampling circuit 2 after being connected in parallel to the anode of the diode D1 and the source of the transistor Q1, and the cathode of the diode D1 is connected to the port N1 after being connected in parallel to the drain of the transistor Q1.
The current sampling circuit 2 comprises a resistor R3, one end of the resistor R3 is connected with the first MOS main power circuit 1, and the other end is connected with the second MOS main power circuit 3.
The second MOS main power circuit 3 comprises a transistor Q2, a diode D2 and a resistor R2, one end of the resistor R2 is connected with the base of the transistor Q2, the other end of the resistor R2 is connected with the anode of the diode D2 and the source of the transistor Q2 in parallel and then connected with the current sampling circuit 2, and the cathode of the diode D2 is connected with the drain of the transistor Q2 in parallel and then connected with a port N3.
The current-limiting control circuit 4 comprises an operational amplifier U1, an operational amplifier U2, an operational amplifier U3, an operational amplifier U4, a diode D4, a resistor R4 and a resistor R4, wherein one end of the resistor R4 is connected in parallel with one end of the resistor R4 and then connected to the current sampling circuit 2, the other end of the resistor R4 is connected in parallel with one end of the resistor R4 and then connected to an inverting input end of the operational amplifier U4, the other end of the resistor R4 is connected in parallel with an anode of the diode D4 and then connected to an output end of the operational amplifier U4, one end of the resistor R4 is connected to a control ground 4 and the inverting input end of the operational amplifier U4, the other end of the resistor R9 is connected in parallel with the anode of the diode D4 and then connected with the output end of the operational amplifier U2, one end of the resistor R8 is connected with the current sampling circuit 2, the other end of the resistor R8 is connected with the non-inverting input end of the operational amplifier U2, the cathode of the diode D3 is connected in parallel with the cathode of the diode D4 and then connected with one end of the resistor R10, the other end of the resistor R10 is connected with the non-inverting input end of the operational amplifier U3, the inverting input end of the operational amplifier U3 is connected with the output end of the operational amplifier U3 and then connected with one end of the resistor R13, the other end of the resistor R13 is connected in parallel with one end of the resistor R14 and then connected with the inverting input end of the operational amplifier U4, the other end of the resistor R14 is connected in parallel with one end of the resistor R15 and then connected with the output end of the operational amplifier U4, the other end of the resistor R15 is connected with the input end of the MOS drive circuit 5, one end of the resistor R11 is connected with +15V of a control power supply, the other end of the resistor R11 is connected with the non-inverting input end of the operational amplifier after being connected with one end of the resistor R12 in parallel, and the other end of the resistor R12 is connected with a control ground GND 2.
The MOS drive circuit 5 comprises a transistor Q3 and a transistor Q4, the collector of the transistor Q3 is connected with a +15V power supply, the base of the transistor Q4 is connected with the current-limiting control circuit 4 after being connected in parallel, the emitter of the transistor Q4 is connected with the control ends of the first MOS main power circuit 1 and the second MOS main power circuit 3 after being connected in parallel, and the collector of the transistor Q4 is connected with a control ground GND 2.
As shown in fig. 1 and 2, the present invention is composed of parts, and the specific working principle is as follows: when current flows from the port N1 to the port N3, the gate-source voltages of the transistor Q1 and the transistor Q2 are set to the maximum value, the transistor Q1 and the transistor Q2 are turned on, and current flows through the channels thereof. When overcurrent occurs, the current flowing through the transistor Q1 and the transistor Q2 is increased, the current flowing through the current sampling resistor R3 is increased, the acquired voltage value is increased, the gate-source voltage of the driving transistor Q1 and the gate-source voltage of the driving transistor Q2 are pulled down rapidly through negative feedback and a proportional regulator, the equivalent on-resistance is increased, and the current limiting effect is achieved. The current limiting principle is the same as when current flows from port N3 to port N1.
In addition, the transistor Q1 is an N-channel enhancement mode field effect transistor, the transistor Q2 is an N-channel enhancement mode field effect transistor, the transistor Q3 is an NPN bipolar transistor, and the transistor Q4 is a PNP bipolar transistor.
While the preferred embodiments of the present invention have been described in detail, it will be understood that the invention may be embodied in other forms than those specifically described and that various changes in form and details may be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides an alternating current-direct current-limiting electronic switch, its characterized in that includes first MOS main power circuit (1), current sampling circuit (2), second MOS main power circuit (3), current-limiting control circuit (4) and MOS drive circuit (5), first MOS main power circuit (1) is connected with second MOS main power circuit (3) through current sampling circuit (2), current sampling circuit (2) output links to each other with current-limiting control circuit (4) input, current-limiting control circuit (4) output links to each other with MOS drive circuit (5) input, MOS drive circuit (5) output links to each other with the control end of first MOS main power circuit (1) and second MOS main power circuit (3).
2. The ac-dc current-limiting electronic switch according to claim 1, wherein: the first MOS main power circuit (1) comprises a transistor Q1, a diode D1 and a resistor R1, one end of the resistor R1 is connected with the base electrode of the transistor Q1, the other end of the resistor R1 is connected with the anode of the diode D1 and the source of the transistor Q1 in parallel and then connected with the current sampling circuit (2), and the cathode of the diode D1 is connected with the drain of the transistor Q1 in parallel and then connected with a port N1.
3. The ac-dc current-limiting electronic switch according to claim 1, wherein: the current sampling circuit (2) comprises a resistor R3, one end of the resistor R3 is connected with the first MOS main power circuit (1), and the other end of the resistor R3 is connected with the second MOS main power circuit (3).
4. The ac-dc current-limiting electronic switch according to claim 1, wherein: the second MOS main power circuit (3) comprises a transistor Q2, a diode D2 and a resistor R2, one end of the resistor R2 is connected with the base electrode of the transistor Q2, the other end of the resistor R2 is connected with the anode of the diode D2 and the source of the transistor Q2 in parallel and then connected with the current sampling circuit (2), and the cathode of the diode D2 is connected with the drain of the transistor Q2 in parallel and then connected with a port N3.
5. The ac-dc current-limiting electronic switch according to claim 1, wherein: the current-limiting control circuit (4) comprises an operational amplifier U1, an operational amplifier U2, an operational amplifier U3, an operational amplifier U4, a diode D4, a resistor R4 and a resistor R4, wherein one end of the resistor R4 is connected with one end of the resistor R4 in parallel and then connected with a current sampling circuit (2), the other end of the resistor R4 is connected with one end of the resistor R4 in parallel and then connected with an inverting input end of the operational amplifier U4, the other end of the resistor R4 is connected with an anode of the diode D4 in parallel and then connected with an output end of the operational amplifier U4, one end of the resistor R4 is connected with a control ground 4, the other end of the resistor R4 is connected with a non-inverting input end of the operational amplifier U4, and the other end of the resistor R4 is connected with an inverting input end of the operational amplifier U4 in parallel and GND, the other end of the resistor R9 is connected in parallel with the anode of the diode D4 and then connected with the output end of the operational amplifier U2, one end of the resistor R8 is connected with a current sampling circuit (2), the other end of the resistor R8 is connected with the non-inverting input end of the operational amplifier U2, the cathode of the diode D3 is connected in parallel with the cathode of the diode D4 and then connected with one end of the resistor R10, the other end of the resistor R10 is connected with the non-inverting input end of the operational amplifier U3, the inverting input end of the operational amplifier U3 is connected with the output end of the operational amplifier U3 and then connected with one end of the resistor R13, the other end of the resistor R13 is connected in parallel with one end of the resistor R14 and then connected with the inverting input end of the operational amplifier U4, the other end of the resistor R14 is connected in parallel with one end of the resistor R15 and then connected with the output end of the operational amplifier U4, the other end of the resistor R15 is connected with the input end of the MOS drive circuit (5), one end of the resistor R11 is connected with +15V of a control power supply, the other end of the resistor R12 is connected with the non-inverting input end of the operational amplifier after being connected in parallel, and the other end of the resistor R12 is connected with a control ground GND 2.
6. The ac-dc current-limiting electronic switch according to claim 1, wherein: the MOS drive circuit (5) comprises a transistor Q3 and a transistor Q4, the collector of the transistor Q3 is connected with a +15V power supply, the base of the transistor Q4 is connected with the current-limiting control circuit (4) after being connected in parallel, the emitter of the transistor Q4 is connected with the control ends of the first MOS main power circuit (1) and the second MOS main power circuit (3) after being connected in parallel, and the collector of the transistor Q4 is connected with a control ground GND 2.
7. The ac-dc current-limiting electronic switch according to claim 2, wherein: the transistor Q1 is an N-channel enhancement mode field effect transistor.
8. The ac-dc current-limiting electronic switch according to claim 4, wherein: the transistor Q2 is an N-channel enhancement mode field effect transistor.
9. The ac-dc current-limiting electronic switch according to claim 6, wherein: the transistor Q3 is an NPN bipolar transistor.
10. The ac-dc current-limiting electronic switch according to claim 6, wherein: the transistor Q4 is a PNP bipolar transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023042827.9U CN213990137U (en) | 2020-12-16 | 2020-12-16 | AC/DC current-limiting electronic switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023042827.9U CN213990137U (en) | 2020-12-16 | 2020-12-16 | AC/DC current-limiting electronic switch |
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| Publication Number | Publication Date |
|---|---|
| CN213990137U true CN213990137U (en) | 2021-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023042827.9U Active CN213990137U (en) | 2020-12-16 | 2020-12-16 | AC/DC current-limiting electronic switch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114625044A (en) * | 2022-03-08 | 2022-06-14 | 南京航空航天大学 | Variable voltage drive control circuit for adjusting parallel current sharing of power tubes |
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2020
- 2020-12-16 CN CN202023042827.9U patent/CN213990137U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114625044A (en) * | 2022-03-08 | 2022-06-14 | 南京航空航天大学 | Variable voltage drive control circuit for adjusting parallel current sharing of power tubes |
| CN114625044B (en) * | 2022-03-08 | 2023-12-01 | 南京航空航天大学 | Voltage-variable drive control circuit for adjusting parallel current sharing of power tubes |
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