CN101882867B - Anti-strong interference switch control signal generating circuit of system power supply - Google Patents
Anti-strong interference switch control signal generating circuit of system power supply Download PDFInfo
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- CN101882867B CN101882867B CN 201010210025 CN201010210025A CN101882867B CN 101882867 B CN101882867 B CN 101882867B CN 201010210025 CN201010210025 CN 201010210025 CN 201010210025 A CN201010210025 A CN 201010210025A CN 101882867 B CN101882867 B CN 101882867B
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Abstract
The invention discloses an anti-strong interference switch control signal generating circuit of a system power supply, which comprises a switch signal self-locking module, a switch signal isolation module, an opening and closing state switching module and a soft-off interface module, wherein the switch signal isolation module, the opening and closing state switching module and the soft-off interface module are respectively connected with the switch signal self-locking module. The circuit can stably output the switch state of the power supply in an environment with strong interference, ensure the normal power supply and the normal closing of the system power supply and be applied in the harsh environment. In addition, the power supply switch control signal generating circuit is mainly constituted by an integrated circuit of a resistor-capacitor device and a hex inverter, and the cost is very low.
Description
Technical field
The present invention relates to a kind of electronic equipment, especially design each class of electronic devices, the especially anti-strongly disturbing switch control signal generating circuit of system power supply in having the electronic equipment of strong interference environment such as a kind of instrument and meter that can be applicable to have the power supply touch-switch and information equipment.
Background technology
At present, in the electronic equipment with power supply touch-switch that uses, the switch generation circuit that its control power supply is opened and closed all adopts single-chip microcomputer or other microcontroller to realize basically, it gathers the state of power supply touch-switch on the electronic equipment by software mode, and according to the length of button time with shortly judge whether start or shutdown, thereby export corresponding signal and give system power supply (as the ATX power supply), realize the Kai Heguan of device power supply (DPS).But this microcontroller with software is interfered easily or crashing or misoperation appears in the defective of software own, thus cause electronic equipment open by mistake shutdown or can not switching on and shutting down.Though most of this equipment have been done jamproof measure at software, substantially all be the anti-shake processing of handling switch, program fleet deadlock problem is appearred in slight control itself still can't solve owing to being interfered.
Summary of the invention
For the shortcoming that the mains switch control signal generation circuit that overcomes existing microcontroller pattern is interfered easily, the invention provides a kind of anti-strongly disturbing switch control signal generating circuit of system power supply.
The technical solution adopted for the present invention to solve the technical problems is: a kind of anti-strongly disturbing switch control signal generating circuit of system power supply, it comprises: switching signal self-locking module, switching signal isolation module, open and closed handover module and soft-off interface module.Wherein, described switching signal isolation module, open and closed handover module and soft-off interface module link to each other with switching signal self-locking module respectively.
Further, described switching signal self-locking module mainly is made up of reverser U1A, U1C and resistance R 6.The input connecting resistance R6 of reverser U1A, the input of the output termination reverser U1C of reverser U1A, the other end of the output connecting resistance R6 of reverser U1C.
Further, described switching signal isolation module mainly is made up of diode D2, resistance R 4 and R7, capacitor C 1 and triode Q2.The negative pole connecting resistance R4 of diode D2, the other end of resistance R 4 divide 3 tunnel, one tunnel base stage that meets triode Q2, lead up to capacitor C 1 ground connection, lead up to resistance R 7 ground connection, the grounded emitter of triode Q2.
Further, described soft-off interface module is mainly by resistance R 5, R8 and R9, capacitor C 2, electrochemical capacitor C3, and diode D3, triode Q3 forms.Resistance R 9 connects the positive pole of diode D3, the negative pole of diode D3 divides 3 the tunnel, one the tunnel through capacitor C 2 ground connection, one the tunnel through resistance R 8 ground connection, one the tunnel connects the base stage of triode Q3, the emitter connecting resistance R5 of triode Q3, the grounded collector of triode Q3, the minus earth of electrochemical capacitor C3, the other end of the positive pole of electrochemical capacitor C3 and resistance R 5 insert the positive pole of the reverser U1A of switching signal self-locking module.
Further, described open and closed handover module is mainly by P metal-oxide-semiconductor Q1, diode D1, and reverser U1B, U1D, U1E, resistance R 1, R2, R3, R10, electrochemical capacitor C4 forms.The grid of P metal-oxide-semiconductor Q1 connects positive pole and the resistance R 1 of diode D1 respectively, the other end of the source electrode connecting resistance R1 of P metal-oxide-semiconductor Q1, the drain electrode of P metal-oxide-semiconductor Q1 inserts the positive pole of reverser U1E successively by resistance R 10 and R2, the negative pole of diode D1 connects the negative pole of reverser U1E, the positive pole of reverser U1E connects the negative pole of reverser U1D, the positive pole of reverser U1D divides two-way, one the tunnel connects the positive pole of electrochemical capacitor C4, another road connects the negative pole of reverser U1B by resistance R 3, the positive pole of reverser U1B inserts the negative pole of reverser U1A in the switching signal self-locking module, the minus earth of electrochemical capacitor C4.
The invention has the beneficial effects as follows that circuit of the present invention on off state of out-put supply stably in strongly disturbing environment guarantees the system power supply normal power supply and normally closes, and can be applied in the rugged environment.In addition, this mains switch control signal generation circuit mainly is made of the integrated circuit of capacitance resistance ware and 6 inverters, and cost is also very low.
Description of drawings
Fig. 1 is the circuit diagram of the embodiment of the invention.
Embodiment
The present invention adopts the pure hardware circuit structure, evades the software deadlock problem of using microcontroller to cause, and it mainly is made of 4 modules: switching signal self-locking module, switching signal isolation module, open and closed handover module and soft-off interface module.When the power supply touch-switch is pressed, the open and closed handover module is exported wherein a kind of state according to current state, the switching signal isolation module is caught and outputed to this state by switching signal self-locking module, arrives the input interface of system power supply at last, thereby realize the Kai Heguan of system power supply.The soft-off interface module is mainly used in receiving the soft-off signal from system, and is connected with switching signal self-locking module, thereby reaches the soft-off function.Switching signal self-locking module is mainly used in locking state and the out-put supply switch controlling signal that need switch when the power supply touch-switch is pressed, constituted by 2 inverters, 1 electrochemical capacitor and 1 resistance, constitute capacitance voltage moment when discharging and recharging according to electrochemical capacitor and resistance and can not the saltus step principle suppress strong jamming positive negative pulse stuffing from external environment condition.The switching signal isolation module is mainly used in the switch control input interface of isolating switch signal circuit and system power supply, prevent the fault that both cause because of different voltages, it is made of 1 diode, 1 PNP triode and part resistance capacitance, wherein diode is used for lift level increase noise margin, thereby filtering is partly disturbed, and the charge and discharge device of capacitance resistance ware formation can absorb the interference spike in addition.The open and closed handover module realizes identifying current system power supply state on the one hand, is on the other hand when the power supply touch-switch is pressed, and according to current state this push button signalling is switched to start or off signal.This module is mainly by 3 inverters, 1 diode, 1 N-channel MOS pipe, and 1 electrochemical capacitor and 4 resistance constitute.The soft-off interface module mainly provides the interface of software shutdown to system, thereby can realize software even remote power-off, and it is made up of 1 diode, 1 PNP triode and part resistance capacitance.
Further specify the present invention below in conjunction with drawings and Examples, it is more obvious that purpose of the present invention and effect will become.
As shown in Figure 1, the anti-strongly disturbing switch control signal generating circuit of system power supply of the present invention comprises: switching signal self-locking module, switching signal isolation module, open and closed handover module and soft-off interface module.Wherein, switching signal isolation module, open and closed handover module and soft-off interface module link to each other with switching signal self-locking module respectively.
Specific as follows:
Switching signal self-locking module: mainly formed the input connecting resistance R6 of reverser U1A, the input of the output termination reverser U1C of reverser U1A, the other end of the output connecting resistance R6 of reverser U1C by reverser U1A, U1C and resistance R 6; Switching signal self-locking module is used for the on off state of locking input, U1A, U1C and R6 constitute regenerative circuit, when the signal from touch-switch when being high, be input to U1A, U1C output this moment also be high, and by R6 high level is fed back to the input of U1A, even touch-switch unclamps at this moment, U1A also keeps the state of original input, thereby the formation self-locking is equally when being input to U1A when being low level, the U1C output low level.R6 and C3 constitute charging device, determine the touch-switch button by how long reaching start, and the size that can regulate R8 resistance realizes, R8=15K in the diagram, and its button time is about 1 second.Can eliminate key jitter causes misoperation to this charging device on the one hand; On the other hand can not the saltus step principle according to the voltage on the electric capacity, can suppress the strong jamming positive negative pulse stuffing that the outside causes.
Switching signal isolation module: mainly formed by diode D2, resistance R 4 and R7, capacitor C 1 and triode Q2, the negative pole connecting resistance R4 of diode D2, the other end of resistance R 4 divides 3 the tunnel, one the tunnel connects the base stage of triode Q2, lead up to capacitor C 1 ground connection, lead up to resistance R 7 ground connection, the grounded emitter of triode Q2.The switching signal isolation module work is opened the output of triode Q2 collector electrode on off state, directly links to each other with the input interface of system power supply; This opener electrode way of output can make two different modules different powering modes of use and not influence each other.Q2 improves by the high level that series connection makes behind the D2 Q2 begin conducting, promotes from 0.7V and gets 1.4V, triggers thresholding thereby improve.R4, R7 and C4 constitute resistance-capacitance network, and an effect is exactly when the U1C output low level, because D2 has blocked low level input, this moment, the ground connection by R7 made the Q2 on-line operation in high-impedance state.Another effect is exactly to form RC network, has the effect of filtering spike, reaches jamproof effect.
Soft-off interface module: mainly by resistance R 5, R8 and R9, capacitor C 2, electrochemical capacitor C3, diode D3, triode Q3 forms, resistance R 9 connects the positive pole of diode D3, the negative pole of diode D3 divides 3 the tunnel, one the tunnel through capacitor C 2 ground connection, one the tunnel through resistance R 8 ground connection, one the tunnel connects the base stage of triode Q3, the emitter connecting resistance R5 of triode Q3, the grounded collector of triode Q3, the minus earth of electrochemical capacitor C3, the other end of the positive pole of electrochemical capacitor C3 and resistance R 5 insert the positive pole of the reverser U1A of switching signal self-locking module.Resistance R 5 provides interface for system by the software shutdown.Low level of output arrives this module when system, and D3 isolates not conducting, and Q3 by the discharge of R5 resistance, makes that U1C is low level with regard to conducting like this, and the Q2 current collection is high resistant very, thereby concerns power supply.If system's output is a high level or high resistant, just not conducting of Q3 is that switching signal generation circuit is kept original state.
Open and closed handover module: mainly by P metal-oxide-semiconductor Q1, diode D1, reverser U1B, U1D, U1E, resistance R 1, R2, R3, R10, electrochemical capacitor C4 forms, the grid of P metal-oxide-semiconductor Q1 connects positive pole and the resistance R 1 of diode D1 respectively, the other end of the source electrode connecting resistance R1 of P metal-oxide-semiconductor Q1, the drain electrode of P metal-oxide-semiconductor Q1 inserts the positive pole of reverser U1E successively by resistance R 10 and R2, the negative pole of diode D1 connects the negative pole of reverser U1E, the positive pole of reverser U1E connects the negative pole of reverser U1D, the positive pole of reverser U1D divides two-way, and one the tunnel connects the positive pole of electrochemical capacitor C4, and another road connects the negative pole of reverser U1B by resistance R 3, the positive pole of reverser U1B inserts the negative pole of reverser U1A in the switching signal self-locking module, the minus earth of electrochemical capacitor C4.The open and closed handover module is mainly used in switching from closing to the state of opening from reaching the pass.If system is in power down state, the U1A input is low level, the U1E output low level, and 1 pin of Q1 is 0.7V～1.2V, thereby makes the Q1 conducting.This moment is when pressing if any the power supply touch-switch, network KEY1 and KEY2 connect, power supply charges to C3 by R8 resistance, R2 resistance also charges to C3 in addition, but because R8 is more much smaller than R2, thus the time of main charging have R8 to decide, when charging voltage reaches high level, latching circuit just locks high level, thereby reaches power-on.If system is in power opening state, the U1A input is high level, and U1E exports high level, and Q1 is in closed condition; The U1D output low level, this moment, network KEY1 and KEY2 connected when pressing if any the power supply touch-switch, and C3 discharges by R2, and when C3 voltage was put low level thresholding to U1A, latching circuit just locked low level, thereby reaches powered-down.The power supply touch-switch is pressed the required time when shutting down by regulating of adjusting R2 resistance, and the reference value time is about 6 seconds among the figure.U1B in addition, R3 and C4 constitute a kind of button buffer circuit, provide time enough for button discharges, just press as button, when the output on off state of U1C changed, the state of U1C and U1E can not prevent the switching that open and closed are not stopped effectively at once along with change.Reverser all can adopt the product of TIX to realize.
Claims (1)
1. an anti-strongly disturbing switch control signal generating circuit of system power supply is characterized in that it comprises: switching signal self-locking module, switching signal isolation module, open and closed handover module and soft-off interface module; Wherein, described switching signal isolation module, open and closed handover module and soft-off interface module link to each other with switching signal self-locking module respectively; Described switching signal self-locking module mainly is made up of reverser U1A, U1C and resistance R 6; The input connecting resistance R6 of reverser U1A, the input of the output termination reverser U1C of reverser U1A, the other end of the output connecting resistance R6 of reverser U1C; Described switching signal isolation module mainly is made up of diode D2, resistance R 4 and R7, capacitor C 1 and triode Q2; The negative pole connecting resistance R4 of diode D2, the other end of resistance R 4 divide 3 tunnel, one tunnel base stage that meets triode Q2, lead up to capacitor C 1 ground connection, lead up to resistance R 7 ground connection, the grounded emitter of triode Q2; Described soft-off interface module is mainly by resistance R 5, R8 and R9, capacitor C 2, electrochemical capacitor C3, and diode D3, triode Q3 forms, and the anode of diode D2 is connected with the output of reverser U1C; Resistance R 9 connects the positive pole of diode D3, the negative pole of diode D3 divides 3 the tunnel, one the tunnel through capacitor C 2 ground connection, one the tunnel through resistance R 8 ground connection, one the tunnel connects the base stage of triode Q3, the emitter connecting resistance R5 of triode Q3, the grounded collector of triode Q3, the minus earth of electrochemical capacitor C3, the other end of the positive pole of electrochemical capacitor C3 and resistance R 5 insert the input of the reverser U1A of switching signal self-locking module; Described open and closed handover module is mainly by P metal-oxide-semiconductor Q1, diode D1, and reverser U1B, U1D, U1E, resistance R 1, R2, R3, R10, electrochemical capacitor C4 forms; The grid of P metal-oxide-semiconductor Q1 connects positive pole and the resistance R 1 of diode D1 respectively, the other end of the source electrode connecting resistance R1 of P metal-oxide-semiconductor Q1, the drain electrode of P metal-oxide-semiconductor Q1 inserts the input of reverser U1E successively by resistance R 10 and R2, the negative pole of diode D1 connects the output of reverser U1E, the output of the input termination reverser U1D of reverser U1E, the input of reverser U1D divides two-way, one the tunnel connects the positive pole of electrochemical capacitor C4, another road connects the output of reverser U1B by resistance R 3, the input of reverser U1B inserts the output of reverser U1A in the switching signal self-locking module, the minus earth of electrochemical capacitor C4.
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| CN 201010210025 CN101882867B (en) | 2010-06-28 | 2010-06-28 | Anti-strong interference switch control signal generating circuit of system power supply |
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| CN 201010210025 CN101882867B (en) | 2010-06-28 | 2010-06-28 | Anti-strong interference switch control signal generating circuit of system power supply |
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| CN102291558B (en) * | 2011-08-24 | 2013-05-08 | 深圳创维－Rgb电子有限公司 | Television and resetting system thereof |
| CN102290977B (en) * | 2011-08-30 | 2013-07-31 | 北京机械设备研究所 | Flow equalization control circuit of switching power supply maximum value with offset direct current |
| CN106199477B (en) | 2016-07-01 | 2019-06-18 | 西安华为技术有限公司 | Circuit, self-checking circuit, AFCI and photovoltaic generating system occur for noise |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201210722Y (en) * | 2008-02-29 | 2009-03-18 | 四川长虹电器股份有限公司 | System auxiliary reset circuit |
| CN201717782U (en) * | 2010-06-28 | 2011-01-19 | 浙江大华技术股份有限公司 | Power supply switch control signal generating circuit of strong jamming prevention system |
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| US20060038449A1 (en) * | 2004-08-19 | 2006-02-23 | Formenti Jose A V | Apparatus and method for selectively coupling a system with a first power supply or a second power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201210722Y (en) * | 2008-02-29 | 2009-03-18 | 四川长虹电器股份有限公司 | System auxiliary reset circuit |
| CN201717782U (en) * | 2010-06-28 | 2011-01-19 | 浙江大华技术股份有限公司 | Power supply switch control signal generating circuit of strong jamming prevention system |
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