CN203574624U - Switch control circuit - Google Patents
Switch control circuit Download PDFInfo
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- CN203574624U CN203574624U CN201320617330.6U CN201320617330U CN203574624U CN 203574624 U CN203574624 U CN 203574624U CN 201320617330 U CN201320617330 U CN 201320617330U CN 203574624 U CN203574624 U CN 203574624U
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- Prior art keywords
- isolating switch
- control
- circuit
- triode
- switch circuit
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- 238000011068 load Methods 0.000 claims abstract description 74
- 230000000875 corresponding Effects 0.000 claims abstract description 25
- 239000004065 semiconductor Substances 0.000 claims description 31
- 229910004682 ON-OFF Inorganic materials 0.000 claims description 29
- 239000003990 capacitor Substances 0.000 claims description 10
- 230000003287 optical Effects 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 1
Abstract
The embodiment of the utility model discloses a switch control circuit. The switch control circuit comprises a control module, at least one load input terminal INPUT, at least one isolating switch circuit respectively corresponding to each load input terminal INPUT, an operating voltage input terminal VIN and a load output terminal OUTPUT; each isolating switch circuit comprises an optical MOS switch and a triode; the control module is used for sending a control level for each isolating switch circuit; and the operating voltage input terminal VIN is used for providing operating voltage for the control module and the isolating switch circuits. Current though a light emitting diode in each optical MOS switch can be increased, transmission power of loads can be increased, and thermal loss can be reduced; and circuit switching between the at least one load input terminal INPUT with identical voltage parallel flow input or different voltage input and the load output terminal OUTPUT can be achieved, rear-end equipment corresponding to the loads can be protected, and large-scale control integration and modularization can also be achieved.
Description
Technical field
The utility model relates to circuit control field, relates in particular to a kind of ON-OFF control circuit.
Background technology
Existing ON-OFF control circuit is usually used in analogue signal circuit, this ON-OFF control circuit can comprise at least one load input terminal, the light MOS control switch corresponding with each load input terminal, with non-door controller corresponding to each load input terminal, input control end and the load output corresponding with each non-door controller, this ON-OFF control circuit is by input control end input control signal, controls corresponding load input terminal to whether conducting of the circuit between load output.The operating current of non-door controller is lower, and the electric current that the light-emitting diode in light MOS control switch flows through is affected, and causes the unlatching of the metal-oxide-semiconductor in light MOS control switch to be restricted; In addition, the inside of non-door controller has electric current to pass through, and causes the thermal losses of non-door controller itself larger; And the control circuit power of input control end is restricted in prior art, be unfavorable for concentrating modularity control.
Utility model content
The utility model embodiment provides a kind of ON-OFF control circuit, can increase the electric current in the light-emitting diode in light MOS switch, increases the through-put power of load, reduces thermal losses; Realize the identical voltage of input and flow or at least one load input terminal INPUT of inputting different voltages switches to the circuit between load output OUTPUT, rear end equipment corresponding to protection load, and realize large-scale control integration, modularization.
The utility model embodiment provides a kind of ON-OFF control circuit, comprises control module, at least one load input terminal INPUT, at least one isolating switch circuit, operating voltage input VIN and the load output OUTPUT corresponding with each load input terminal INPUT respectively;
Described isolating switch circuit comprises light MOS switch and triode, described smooth MOS switch comprises light-emitting diode and metal-oxide-semiconductor, the positive pole of described light-emitting diode is connected with operating voltage input VIN, the negative pole of described light-emitting diode is connected with the emitter of described triode, the drain electrode of described metal-oxide-semiconductor connects with corresponding load input terminal INPUT, the source electrode of described metal-oxide-semiconductor is connected with load output OUTPUT, the base stage of described triode is connected with described control module, and the collector electrode of described triode is connected with ground;
Described control module is for sending control level to each isolating switch circuit;
Described operating voltage input VIN, for providing operating voltage to described control module and described isolating switch circuit.
Implement the utility model embodiment, by select triode in isolating switch circuit, can increase the electric current in the light-emitting diode in light MOS switch, increase the through-put power of load, reduce thermal losses.The utility model comprises at least one load input terminal INPUT and at least one isolating switch circuit corresponding with each load input terminal INPUT respectively; realize the identical voltage of input and flow or at least one load input terminal INPUT of inputting different voltages switches to the circuit between load output OUTPUT; rear end equipment corresponding to protection load, and realize large-scale control integration, modularization.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic diagram of a kind of ON-OFF control circuit of providing of the utility model embodiment;
Fig. 2 is the schematic diagram of a kind of ON-OFF control circuit of providing of another embodiment of the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is a part of embodiment of the present utility model, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model provides a kind of ON-OFF control circuit, can increase the electric current in the light-emitting diode in light MOS switch, increases the through-put power of load, reduces thermal losses; Realize the identical voltage of input and flow or at least one load input terminal INPUT of inputting different voltages switches to the circuit between load output OUTPUT, rear end equipment corresponding to protection load, and realize large-scale control integration, modularization.Below be elaborated respectively.
Please refer to Fig. 1, is the schematic diagram of a kind of ON-OFF control circuit of providing of the utility model embodiment, and described circuit comprises control module, load input terminal INPUT, isolating switch circuit, operating voltage input VIN and load output OUTPUT;
Described isolating switch circuit comprises light MOS switch U1 and triode Q1, described smooth MOS switch comprises light-emitting diode and metal-oxide-semiconductor, the positive pole of described light-emitting diode is connected with operating voltage input VIN, the negative pole of described light-emitting diode is connected with the emitter of triode Q1, the drain electrode of described metal-oxide-semiconductor is connected with load input terminal INPUT, the source electrode of described metal-oxide-semiconductor is connected with load output OUTPUT, the base stage of described triode Q1 is connected with described control module, and the collector electrode of described triode Q1 is connected with ground;
Described control module is for sending control level to each isolating switch circuit;
Described operating voltage input VIN, for providing operating voltage to described control module and described isolating switch circuit.
Metal-oxide-semiconductor in described smooth MOS switch can be N-channel MOS pipe, and the triode Q1 in described isolating switch circuit can be positive-negative-positive triode.
Wherein, control module can comprise single-chip microcomputer, and described single-chip microcomputer can comprise at least one control port, operating voltage input port and grounding ports;
Described control port connects with the base stage of triode Q1 in described corresponding isolating switch circuit, for the isolating switch circuit to described correspondence, transmits control signal, and controls whether conducting of triode Q1 in the isolating switch circuit of described correspondence;
Described operating voltage input port is connected with operating voltage input VIN.
Single-chip microcomputer is when receiving logical signal, and to the instruction of control port transmitted signal, control port receives after signal instruction, to isolating switch circuit, sends control level, controls the whether conducting of isolating switch circuit.
Wherein, in isolating switch circuit, select triode Q1, described triode Q1 has the effect of switch, can increase the electric current in the light-emitting diode in light MOS switch, make the metal-oxide-semiconductor in light MOS switch can obtain better driving force, increase the through-put power of load, reduce thermal losses, improved the reliability of the triode Q1 in isolating switch circuit.
Further, logical signal can comprise that load control to switch requirement, also can comprise overvoltage, under-voltage, overcurrent, overheated, fault or the signal that detects protection such as emergent, and this single-chip microcomputer can be chip IC 1.
Further preferred, on the basis of above-described embodiment, referring to Fig. 1, above-mentioned isolating switch circuit can also comprise reverse cut-off rectifier diode D1, the positive pole of described reverse cut-off rectifier diode D1 is connected with described load input terminal INPUT, and the negative pole of described reverse cut-off rectifier diode D1 is connected with the drain electrode of metal-oxide-semiconductor in described smooth MOS switch U1.For preventing that control module is because of receiving signal misoperation; cause the input device of load input terminal INPUT to be punctured by the anti-electric current of filling with by anti-input device of filling with voltage breakdown or load input terminal INPUT; the input device of load input terminal INPUT is burnt; between the drain electrode of the metal-oxide-semiconductor of the light MOS switch U1 in load input terminal INPUT and isolating switch circuit, increase an oppositely cut-off rectifier diode D1, the input device of protection load input terminal INPUT.
Further preferred, on the basis of above-described embodiment, referring to Fig. 1, above-mentioned ON-OFF control circuit can also comprise filter capacitor C1, and one end of described filter capacitor C1 is connected with load output OUTPUT, and the other end of described filter capacitor C1 is connected with ground.The electric current of load output OUTPUT output is not very stable, by increasing a filter capacitor C1, can carry out filtering to the electric current of load output OUTPUT output, so that the efficient level and smooth output of direct current.
Wherein, the collector electrode of triode Q1 is connected to control signal ground PGND, and the grounding ports in described single-chip microcomputer is connected to control signal ground PGND, and the other end of described filter capacitor C1 is connected to through-put power ground AGND.Control signal ground PGND in described ON-OFF control circuit and through-put power ground AGND can separate, control signal ground PGND separately and the light MOS switch in through-put power ground AGND and isolating switch circuit form the electric isolation of a complete control signal and through-put power, reduce EMC(Electro Magnetic Compatibility, Electro Magnetic Compatibility) disturb and the ground interference of making an uproar, at high frequency, low frequency or can better be applied in current control circuit greatly.
Further preferred, on the basis of above-described embodiment, referring to Fig. 1, above-mentioned isolating switch circuit can also comprise current-limiting resistance, one end of described current-limiting resistance is connected with the emitter of triode in described isolating switch circuit, and the other end of described current-limiting resistance is connected with the negative pole of light-emitting diode in described smooth MOS switch.Triode in assurance isolating switch circuit and the electric current of the light-emitting diode in light MOS switch, in restriction, avoid triode and light MOS switch in isolating switch circuit to damage because electric current is excessive.
Further preferred, on the basis of above-described embodiment, referring to Fig. 1, above-mentioned isolating switch circuit can also comprise driving resistance, one end of described driving resistance connects with the corresponding control port in described single-chip microcomputer, and the other end of described driving resistance is connected with the base stage of triode in described isolating switch circuit.Drive resistance when control module is exported control level, to the base stage of the triode in isolating switch circuit, to provide driving voltage.
Below in conjunction with Fig. 1, the operation principle of a kind of ON-OFF control circuit that specific descriptions the utility model provides.
When the circuit turn-on requiring between load input terminal INPUT and load output OUTPUT, single-chip microcomputer sends signal instruction to control port, control port receives after signal instruction, to isolating switch circuit output low level signal, triode conducting in isolating switch circuit, light-emitting diode in light MOS switch has electric current to pass through, and makes the metal-oxide-semiconductor conducting in light MOS switch, causes the circuit turn-on between load input terminal INPUT and load output OUTPUT.
For example, when requiring circuit between load input terminal INPUT and load output OUTPUT to close, single-chip microcomputer sends signal instruction to control port, control port receives after signal instruction, to isolating switch circuit output high level signal, the triode cut-off in isolating switch circuit, the light-emitting diode in light MOS switch does not have electric current to pass through, metal-oxide-semiconductor cut-off in light MOS switch, causes the circuit between load input terminal INPUT and load output OUTPUT to be closed.
In the ON-OFF control circuit shown in Fig. 1, this ON-OFF control circuit can be for expanding multidimensional control circuit, both can realize the switching of the different multichannel loading of input voltage, also can realize the parallel connection of the multichannel loading of identical input voltage, and can realize the High-current output of load, realize large-scale control integration, modularization.
Please refer to Fig. 2, be the schematic diagram of the ON-OFF control circuit in the another kind of embodiment of the utility model, the ON-OFF control circuit in described utility model embodiment comprises control module, 4 load input terminals, 4 isolating switch circuit, operating voltage input VIN and the load output OUTPUT corresponding with each load input terminal.
Wherein, U1, U2, U3 and U4 are light MOS control switchs; D1, D2, D3 and D4 oppositely end rectifier diode; C1 is output filter capacitor; R1, R2, R3 and R4 are current-limiting resistances; R5, R6, R7 and R8 drive resistance; Q1, Q2, Q3 and Q4 are positive-negative-positive triodes; IC1 is the single-chip microcomputer of logic control; INPUT1, INPUT2, INPUT3 and INPUT4 are load input terminals; OUTPUT is load output; VIN provides operating voltage for light MOS switch and single-chip microcomputer IC1.
The operating voltage input port of IC1 is connected with VIN.
In the isolating switch circuit corresponding with load input terminal INPUT1, one end of R5 is connected with the control port P1 of IC1, the other end of R5 is connected with the base stage of Q1, the emitter of Q1 is connected with one end of R1, the collector electrode of Q1 is connected with control signal ground PGND, the other end of R1 is connected with the negative pole of light-emitting diode in U1, the positive pole of the light-emitting diode in U1 is connected with VIN, the drain electrode of the metal-oxide-semiconductor in U1 is connected with the negative pole of D1, the positive pole of D1 is connected with INPUT1, and the source electrode of the metal-oxide-semiconductor in U1 is connected with OUTPUT.
In the isolating switch circuit corresponding with load input terminal INPUT2, one end of R6 is connected with the control port P2 of IC1, the other end of R6 is connected with the base stage of Q2, the emitter of Q2 is connected with one end of R2, the collector electrode of Q2 is connected with control signal ground PGND, the other end of R2 is connected with the negative pole of light-emitting diode in U2, the positive pole of the light-emitting diode in U2 is connected with VIN, the drain electrode of the metal-oxide-semiconductor in U2 is connected with the negative pole of D2, the positive pole of D2 is connected with INPUT2, and the source electrode of the metal-oxide-semiconductor in U2 is connected with OUTPUT.
In the isolating switch circuit corresponding with load input terminal INPUT3, one end of R7 is connected with the control port P3 of IC1, the other end of R7 is connected with the base stage of Q3, the emitter of Q3 is connected with one end of R3, the collector electrode of Q3 is connected with control signal ground PGND, the other end of R3 is connected with the negative pole of light-emitting diode in U3, the positive pole of the light-emitting diode in U3 is connected with VIN, the drain electrode of the metal-oxide-semiconductor in U3 is connected with the negative pole of D3, the positive pole of D3 is connected with INPUT3, and the source electrode of the metal-oxide-semiconductor in U3 is connected with OUTPUT.
In the isolating switch circuit corresponding with load input terminal INPUT4, one end of R8 is connected with the control port P4 of IC1, the other end of R8 is connected with the base stage of Q4, the emitter of Q4 is connected with one end of R4, the collector electrode of Q4 is connected with control signal ground PGND, the other end of R4 is connected with the negative pole of light-emitting diode in U4, the positive pole of the light-emitting diode in U4 is connected with VIN, the drain electrode of the metal-oxide-semiconductor in U4 is connected with the negative pole of D4, the positive pole of D4 is connected with INPUT4, and the source electrode of the metal-oxide-semiconductor in U4 is connected with OUTPUT.
Control module is when receiving the signal of overvoltage, under-voltage, overcurrent, overheated, fault or the detections protection such as emergent or control module and receiving load and control switching and require; to the instruction of control port transmitted signal; control port receives after signal instruction; to isolating switch circuit, send control level, control the whether conducting of isolating switch circuit.
Q1, Q2, Q3 and Q4 are positive-negative-positive triodes, there is the effect of switch, can increase the electric current in the light-emitting diode in light MOS switch, make the metal-oxide-semiconductor in light MOS switch can obtain better driving force, increase the through-put power of load, reduce thermal losses, improved the reliability of Q1, Q2, Q3 and Q4.
D1, D2, D3 and D4 are for preventing that control module is because of receiving signal misoperation; the input device that causes corresponding INPUT1, INPUT2, INPUT3 and INPUT4 is filled with voltage breakdown or described input device is punctured by the anti-electric current of filling with by counter; described input device is burnt, play the effect of the described input device of protection.
Described ON-OFF control circuit comprises control signal ground PGND and through-put power ground AGND, light MOS switch in control signal ground PGND, through-put power ground AGND and isolating switch circuit forms a complete electric isolation, reduce EMC(Electro Magnetic Compatibility, Electro Magnetic Compatibility) disturb and ground interferences of making an uproar, high frequency, frequency or can better be applied in current control circuit greatly.
Below in conjunction with Fig. 2, the operation principle of a kind of ON-OFF control circuit that specific descriptions the utility model provides.
For example, require INPUT1 to the circuit between OUTPUT and INPUT3 to the circuit turn-on between OUTPUT, turn-off INPUT2 to the circuit between OUTPUT and INPUT4 to the circuit between OUTPUT simultaneously.
Single-chip microcomputer can synchronously be exported respectively a low level signal at control port P1 and control port P3, and low level signal flows through respectively R5 and R7, makes Q1 and Q3 conducting; The circuit turn-on that the circuit turn-on that VIN, U1, R1 and Q1 form and VIN, U3, R3 and Q3 form; Light-emitting diode in U1 and the light-emitting diode in U3 have respectively electric current to pass through, and make metal-oxide-semiconductor in U1 and the metal-oxide-semiconductor conducting in U3, cause INPUT1 to the circuit between OUTPUT and INPUT3 to the circuit turn-on between OUTPUT.
Single-chip microcomputer can synchronously be exported respectively a high level signal at control port P2 and control port P4, Q2 and Q4 cut-off, light-emitting diode in U2 and the light-emitting diode no current in U4 pass through, make metal-oxide-semiconductor and the cut-off of the metal-oxide-semiconductor in U4 in U2, cause INPUT2 to turn-off to the circuit between OUTPUT to the circuit between OUTPUT and INPUT4.
Above disclosed is only the utility model preferred embodiment, certainly can not limit with this interest field of the utility model, and the equivalent variations of therefore doing according to the utility model claim, still belongs to the scope that the utility model is contained.
Claims (8)
1. an ON-OFF control circuit, it is characterized in that, described circuit comprises control module, at least one load input terminal INPUT, at least one isolating switch circuit, operating voltage input VIN and the load output OUTPUT corresponding with each load input terminal INPUT respectively;
Described isolating switch circuit comprises light MOS switch and triode, described smooth MOS switch comprises light-emitting diode and metal-oxide-semiconductor, the positive pole of described light-emitting diode is connected with operating voltage input VIN, the negative pole of described light-emitting diode is connected with the emitter of described triode, the drain electrode of described metal-oxide-semiconductor connects with corresponding load input terminal INPUT, the source electrode of described metal-oxide-semiconductor is connected with load output OUTPUT, the base stage of described triode is connected with described control module, and the collector electrode of described triode is connected with ground;
Described control module is for sending control level to each isolating switch circuit;
Described operating voltage input VIN, for providing operating voltage to described control module and described isolating switch circuit.
2. ON-OFF control circuit as claimed in claim 1, it is characterized in that, described isolating switch circuit also comprises reverse cut-off rectifier diode, the positive pole of the described reverse cut-off rectifier diode load input terminal INPUT corresponding with described reverse cut-off rectifier diode connects, and the negative pole of described reverse cut-off rectifier diode is connected with the drain electrode of metal-oxide-semiconductor in described smooth MOS switch.
3. ON-OFF control circuit as claimed in claim 1, is characterized in that, described control module comprises single-chip microcomputer, and described single-chip microcomputer comprises at least one control port, operating voltage input port and grounding ports;
Described control port connects with the base stage of triode in described corresponding isolating switch circuit, for the isolating switch circuit to described correspondence, transmits control signal, and controls the whether conducting of triode in the isolating switch circuit of described correspondence;
Described operating voltage input port is connected with operating voltage input VIN.
4. ON-OFF control circuit as claimed in claim 3, is characterized in that, described ON-OFF control circuit also comprises filter capacitor, and one end of described filter capacitor is connected with load output OUTPUT, and the other end of described filter capacitor is connected with ground.
5. ON-OFF control circuit as claimed in claim 4, is characterized in that, the collector electrode of described triode is connected to control signal ground PGND;
Grounding ports in described single-chip microcomputer is connected to control signal ground PGND;
The other end of described filter capacitor is connected to through-put power ground AGND.
6. ON-OFF control circuit as claimed in claim 1, it is characterized in that, described isolating switch circuit also comprises current-limiting resistance, one end of described current-limiting resistance is connected with the emitter of triode in described isolating switch circuit, and the other end of described current-limiting resistance is connected with the negative pole of light-emitting diode in described smooth MOS switch.
7. ON-OFF control circuit as claimed in claim 3, it is characterized in that, described isolating switch circuit also comprises driving resistance, one end of described driving resistance connects with the corresponding control port in described single-chip microcomputer, and the other end of described driving resistance is connected with the base stage of triode in described isolating switch circuit.
8. ON-OFF control circuit as claimed in claim 1, is characterized in that, the triode in described isolating switch circuit is positive-negative-positive triode, and the metal-oxide-semiconductor in described smooth MOS switch is N-channel MOS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320617330.6U CN203574624U (en) | 2013-09-30 | 2013-09-30 | Switch control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320617330.6U CN203574624U (en) | 2013-09-30 | 2013-09-30 | Switch control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203574624U true CN203574624U (en) | 2014-04-30 |
Family
ID=50542332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320617330.6U Expired - Fee Related CN203574624U (en) | 2013-09-30 | 2013-09-30 | Switch control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203574624U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684817A (en) * | 2016-12-29 | 2017-05-17 | 青岛海尔科技有限公司 | Protection circuit, load driving circuit and electrical appliance |
| CN110691018A (en) * | 2018-07-06 | 2020-01-14 | 法雷奥汽车空调湖北有限公司 | Automotive electronics and vehicle |
-
2013
- 2013-09-30 CN CN201320617330.6U patent/CN203574624U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684817A (en) * | 2016-12-29 | 2017-05-17 | 青岛海尔科技有限公司 | Protection circuit, load driving circuit and electrical appliance |
| CN106684817B (en) * | 2016-12-29 | 2019-04-19 | 青岛海尔科技有限公司 | A kind of protection circuit, load driving circuits and electric appliance |
| CN110691018A (en) * | 2018-07-06 | 2020-01-14 | 法雷奥汽车空调湖北有限公司 | Automotive electronics and vehicle |
| CN110691018B (en) * | 2018-07-06 | 2022-02-18 | 法雷奥汽车空调湖北有限公司 | Automotive electronics and vehicle |
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