CN201213222Y - Rear stage working circuit protecting device for dual path electric power supplying system - Google Patents
Rear stage working circuit protecting device for dual path electric power supplying system Download PDFInfo
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- CN201213222Y CN201213222Y CNU2008201180783U CN200820118078U CN201213222Y CN 201213222 Y CN201213222 Y CN 201213222Y CN U2008201180783 U CNU2008201180783 U CN U2008201180783U CN 200820118078 U CN200820118078 U CN 200820118078U CN 201213222 Y CN201213222 Y CN 201213222Y
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Abstract
The utility model discloses a post operating circuit protective device of a two-path power supply system, comprising an on-off control circuit and a testing circuit, wherein the on-off control circuit is arranged between a power supply source and a power switching circuit; the testing circuit is connected to the output end of the power switching circuit to respectively test the working state of two-path power supply and output a state control signal after comparing with a test result; the output end of the testing circuit is connected with the on-off control circuit and the testing circuit; and when any path of the two-path power switching circuit has fault, the state control signal sent from the output end of the testing circuit controls the on-off control circuit to shut off a working power supply, thereby a post operating circuit is protected. The post operating circuit protective device can test whether two-path output voltage exists and test the great reduction of the voltage, and has a simple and reliable circuit.
Description
Technical field
The utility model relates to the power protection of medical electronics product, relates in particular to a kind of back level work circuit protection device of double loop power supply electric power system.
Background technology
At present, for the very high medical electronics product of reliability requirement, as X-ray machine etc., in most of the cases, because the supply power mode of the each several part operating circuit of medical electronics product has nothing in common with each other, if wherein the power supply of key component short circuit or damage occur hindering for some reason and the no-output or the supply power voltage that cause decline to a great extent, all may cause the damage of back level work circuit or the misoperation of system.When therefore power failure occurring, need to detect immediately the action work of going forward side by side, promptly close down the working power of whole system or subsystem, thereby late-class circuit is protected for key component.
Existing power protecting circuit only carries out the circuit protection of single channel working power usually; promptly between every road power-switching circuit and back level work circuit, a protective circuit is set all; as shown in Figure 1, the circuit for the different electrical power power pack that has being associated property in the system then can't detect and protect simultaneously.On the other hand; existing power protecting circuit; when back level work circuit is protected; part power protecting circuit is not preserved the function of malfunction; the vibration repeatedly that occurs easily re-powering immediately again after whole system is cut off the power supply and cause; so not only do not play the effect of protection back level work circuit, and cause the damage of back level work circuit probably.Another part power protecting circuit adopts disposable electronic component, such as fuse and so on, can directly cut off the operating voltage of late-class circuit after the fusing, though this has preserved malfunction, needs the frequent fuse of changing, and has increased maintenance cost.
The utility model content
The purpose of this utility model is to provide a kind of back level work circuit protection device of double loop power supply electric power system; when power failure appears in arbitrary road in the output of power supply two-way; back level work circuit is carried out power-off protection, and the level work circuit damages or can't operate as normal thereby avoid afterwards.
The technical solution adopted in the utility model is; the back level work circuit protection device of described double loop power supply electric power system comprises on-off control circuit and testing circuit; described on-off control circuit is between power supply and power-switching circuit; described testing circuit is connected the output of power-switching circuit; two-way power-switching circuit operating state is detected respectively; and testing result compared judge back output state control signal; the output of described testing circuit links to each other with described on-off control circuit; when in the two-way power-switching circuit break down in arbitrary road; the state control signal that the output of described testing circuit is sent is controlled the shutoff that described on-off control circuit carries out power supply, thereby realizes the protection to back level work circuit.
Adopt under the galvanic situation at power supply, described testing circuit and described on-off control circuit are directly powered by power supply; Adopt at power supply under the situation of alternating current; the back level work circuit protection device of described double loop power supply electric power system also comprises the startup power supply; this startup power supply is connected across on the power supply, and converting alternating voltage to the low-voltage direct working power is testing circuit and on-off control circuit power supply.
Adopt technique scheme, the utility model has following advantage at least:
The back level work circuit protection device of the utility model double loop power supply electric power system adopts the detection means of optocoupler as the output of every road power-switching circuit; because optocoupler has buffer action; can be simultaneously for two-way altogether or not altogether the circuit on ground detect; can detect having or not of two output voltage; again because the introducing of reference voltage module; make testing circuit can detect significantly falling of voltage; protect according to the control signal of testing result output and to back level work circuit; circuit is simple and reliable; because adopted the output of optocoupler, can detect the voltage range broad as circuit.
Back of the present invention level work circuit protection device has the function that keeps malfunction, has avoided re-powering immediately again after the whole system outage and the vibration repeatedly that causes, makes not being damaged of back level work circuit.In addition, the interference signals such as burr in the control signal are not produced response, the stability of enhanced system.
Description of drawings
Fig. 1 is existing protective circuit schematic diagram;
Fig. 2 is the back level work circuit protection device first embodiment block diagram of the utility model double loop power supply electric power system;
Fig. 3 is the back level work circuit protection device first embodiment circuit theory diagrams of the utility model double loop power supply electric power system;
Fig. 4 is an on-off control circuit schematic diagram among the utility model first embodiment;
Fig. 5 is the back level work circuit protection device second embodiment block diagram of the utility model double loop power supply electric power system;
Fig. 6 is the back level work circuit protection device second embodiment circuit theory diagrams of the utility model double loop power supply electric power system;
Fig. 7 is an on-off control circuit schematic diagram among the utility model second embodiment;
Fig. 8 is reference voltage module circuit theory diagrams among the utility model second embodiment;
Fig. 9 is an on-off control circuit schematic diagram among the utility model the 3rd embodiment.
Embodiment
For further setting forth the utility model is to reach technological means and the effect that predetermined purpose is taked; below in conjunction with accompanying drawing and preferred embodiment; to the back level work circuit protection device of a kind of double loop power supply electric power system that the utility model proposes, describe in detail as after.
The back level work circuit protection device first embodiment block diagram of the utility model double loop power supply electric power system is divided into following components as shown in Figure 2:
Start power circuit, mainly, alternating voltage is converted to direct voltage offers testing circuit and on-off control circuit for the double loop power supply electric power system that adopts Alternating Current Power Supply.For the double loop power supply electric power system that adopts dc power supply, testing circuit and on-off control circuit can directly use power supply voltage.
Testing circuit, whether have fault produce, and the output state control signal if being used for detecting two-way power supply output, initially powering on and can export the control signal of normal condition during operate as normal simultaneously.This partial circuit can detect two-way and reach not the two-way on ground output altogether altogether, also can detect in the same way or reverse two-way voltage signal, and all have the detection range of broad for two-way voltage.
On-off control circuit; be mainly used in the break-make control of double loop power supply electric power system operating voltage; after sending control signal, testing circuit can automatically shut down power supply; described on-off control circuit has the function that malfunction keeps, and the whole system that causes in order to protect back level work circuit to take to re-power immediately after the outage measure when preventing to break down is vibrated repeatedly.
The utility model first embodiment circuit theory as shown in Figure 3, starting power supply Vs is connected across on the power supply Vi, testing circuit is made up of two-way power output circuit and a comparison circuit, first power output circuit comprises the first optocoupler U1, first resistance R 1, second resistance R 2 and first reference voltage module, the second source output circuit comprises the second optocoupler U2, the 3rd resistance R 3, the 4th resistance R 4 and second reference voltage module, described comparison circuit comprise the 3rd optocoupler U3, the 4th optocoupler U4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and light-emitting diode D1.
The output plus terminal V1+ of first power-switching circuit is connected to the anode of the first optocoupler U1 input side by first resistance R 1, the negative terminal of the first optocoupler U1 input side is connected to the anode of first reference voltage module, the negative terminal of first reference voltage module connects the output negative terminal V1-of first power-switching circuit, the output plus terminal V2+ of second source change-over circuit is connected to the anode of the second optocoupler U2 input side by the 3rd resistance R 3, the negative terminal of the second optocoupler U2 input side is connected to the anode of second reference voltage module, and the negative terminal of second reference voltage module connects the output negative terminal V2-of second source change-over circuit.
The anode of the first optocoupler U1 and the second optocoupler U2 outlet side is connected to by first resistance R 1, the 4th resistance R 4 respectively and starts power supply Vs, and the negative terminal of the outlet side of the first optocoupler U1 and the second optocoupler U2 is connected to the GND end that starts power supply Vs.Connect the anode of the 3rd optocoupler U3 input side and the negative terminal of the 4th optocoupler U4 input side simultaneously from the anode of the first optocoupler U1 outlet side, the anode of the second optocoupler U2 outlet side connects the negative terminal of the 3rd optocoupler U3 input side and the anode of the 4th optocoupler U4 input side simultaneously.The anode of the 3rd optocoupler U3 and the 4th optocoupler U4 outlet side is connected to by the 5th resistance R 5, the 6th resistance R 6 respectively and starts power supply Vs, the anode of the 3rd optocoupler U3 outlet side and the anode of the 4th optocoupler U4 outlet side are connected simultaneously, testing circuit outputs to the on-off control circuit signal input part with control signal CTR, and the negative terminal of the 3rd optocoupler U3 and the 4th optocoupler U4 outlet side then is connected to the GND end that starts power supply Vs simultaneously.The anode of light-emitting diode D1 is connected to by the 7th resistance R 7 and starts power supply Vs, and the negative terminal of light-emitting diode D1 is connected to the anode of the 4th optocoupler U4 outlet side, also links to each other with the on-off control circuit signal input part simultaneously.Starting power supply Vs is the on-off control circuit power supply.
Among the utility model first embodiment the on-off control circuit principle as shown in Figure 4, on-off control circuit adopts the triode mode, described on-off control circuit comprises that switch module and malfunction keep module.Described switch module adopts break-make control triode VD3, and described malfunction keeps module to comprise the first triode VD1, the second triode VD2, the first current-limiting resistance r1, the second current-limiting resistance r2, the 3rd current-limiting resistance r3 and capacitor C.
Control signal CTR is input to the collector electrode of the first triode VD1, the base stage of the second triode VD2 and the base stage of break-make control triode VD3 by the first current-limiting resistance r1, the base stage of the first triode VD1 links to each other with the collector electrode of the second triode VD2 by the second current-limiting resistance r2, the series arm ground connection that the collector electrode of the second triode VD2 is formed by the 3rd current-limiting resistance r3 and capacitor C, the emitter of the first triode VD1 is ground connection also.The collector electrode of break-make control triode VD3 connects supply power voltage Vi, and the emitter of break-make control triode VD3 is connected to the input Vout of power-switching circuit.Draw voltage vcc to provide on the second triode VD2 by starting power supply Vs.
Among the utility model first embodiment in the reference voltage module, first reference voltage module and second reference voltage module all adopt voltage-stabiliser tube that reference voltage is provided, the negative pole of voltage-stabiliser tube connects the input side negative terminal of the first optocoupler U1, and the positive pole of voltage-stabiliser tube is connected in the output negative terminal of power-switching circuit.
When initially powering on, the first optocoupler U1, the second optocoupler U2, the 3rd optocoupler U3, the 4th optocoupler U4 ends, the control signal CTR that testing circuit is sent is a high level, the base stage of the second triode VD2 is a high level, the second triode VD2 is in by state, can not charge this moment to capacitor C, the base stage of the first triode VD1 is a low level, the first triode VD1 is in cut-off state, and the base voltage of break-make control triode VD3 is always high level, so break-make control triode VD3 conducting, promptly on-off control circuit is in conducting state, and the power supply in the double loop power supply electric power system provides operating voltage for back level work circuit.
When first power-switching circuit and second source change-over circuit are all working properly, the first optocoupler U1, the second optocoupler U2 conducting, the 3rd optocoupler U3, the 4th optocoupler U4 end, the control signal CTR that testing circuit is sent is always high level, on-off control circuit is in conducting state, and the power supply in the double loop power supply electric power system provides operating voltage for back level work circuit.
When fault takes place, when the first power-switching circuit no-output or voltage decline to a great extent, the first optocoupler U1, the 4th optocoupler U4 ends, the second optocoupler U2, the 3rd optocoupler U3 conducting, the control signal CTR that testing circuit is sent is a low level, light-emitting diode D1 lights, break-make control triode VD3 ends, be that on-off control circuit is in off-state, power supply in the double loop power supply electric power system stops to be back level work circuit supply, second triode VD2 conducting this moment, this moment the second triode VD2 on draw voltage to pass through the 3rd current-limiting resistance r3 to charge to capacitor C, when the voltage on the capacitor C arrives certain numerical value, the first triode VD1 conducting, control triode VD3 base voltage with break-make and clamp down on all the time in low level this moment, and malfunction is locked.Even this moment, control signal CTR was changed to high level suddenly because system re-powers immediately, on-off control circuit can not conducting, so can not cause damage to back level work circuit.
In addition, because the existence of capacitor charging time can not produce response to the interference signals such as burr among the control signal CTR, the stability of enhanced system.When system's operate as normal; control signal CTR is always high level; if the interference signal on space or the circuit enters system at this moment; because the general energy of interference signal is less; disturb the time ratio that produces shorter; so in circuit control signal CTR, may include the negative pulse interference signal; cause in the control signal CTR short time falling and be low level from high level; but revert to high level soon again; this moment is because the existence of capacitor charging time; when control signal CTR becomes low level; the second triode VD2 begins conducting and charges to capacitor C; but also be not charged to when enough making the first triode VD1 conducting at capacitance voltage; control signal CTR transfers high level to by low level, the second triode VD2 by, this moment, the action of on-off control circuit unprotect produced; can ignore for this interference signal, thereby strengthen the stability and the reliability of system.
In like manner, when second source change-over circuit no-output or voltage decline to a great extent, the second optocoupler U2, the 3rd optocoupler U3 end, the first optocoupler U1, the 4th optocoupler U4 conducting, the control signal CTR that testing circuit is sent is a low level, on-off control circuit is in off-state, and keeps malfunction, and light-emitting diode D1 lights.
The back level work circuit protection device second embodiment block diagram of the utility model double loop power supply electric power system is divided into following components as shown in Figure 5:
Testing circuit, whether have fault produce, and the output state control signal if being used for detecting two-way power supply output, initially powering on and can export the control signal of normal condition during operate as normal simultaneously.This partial circuit can detect two-way and reach not the two-way on ground output altogether altogether, also can detect in the same way or reverse two-way voltage signal, and all have the detection range of broad for two-way voltage.
On-off control circuit; be mainly used in the break-make control of double loop power supply electric power system operating voltage; after sending control signal, testing circuit can automatically shut down power supply; described on-off control circuit has the function that malfunction keeps, and the whole system that causes in order to protect back level work circuit to take to re-power immediately after the outage measure when preventing to break down is vibrated repeatedly.
For the double loop power supply electric power system that adopts dc power supply, testing circuit and on-off control circuit can directly use power supply voltage.
The utility model second embodiment circuit theory as shown in Figure 6, testing circuit goes out circuit by the two-way power supply and a comparison circuit is formed, first power output circuit comprises the first optocoupler U1, first resistance R 1, second resistance R 2 and first reference voltage module, the second source output circuit comprises the second optocoupler U2, the 3rd resistance R 3, the 4th resistance R 4 and second reference voltage module, and described comparison circuit comprises the 3rd optocoupler U3, the 4th optocoupler U4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and light-emitting diode D1.
The output plus terminal V1+ of first power-switching circuit is connected to the anode of the first optocoupler U1 input side by first resistance R 1, the negative terminal of the first optocoupler U1 input side is connected to the anode of first reference voltage module, the negative terminal of first reference voltage module connects the output negative terminal V1-of first power-switching circuit, the output plus terminal V2+ of second source change-over circuit is connected to the anode of the second optocoupler U2 input side by the 3rd resistance R 3, the negative terminal of the second optocoupler U2 input side is connected to the anode of second reference voltage module, and the negative terminal of second reference voltage module connects the output negative terminal V2-of second source change-over circuit.
The anode of the first optocoupler U1 and the second optocoupler U2 outlet side is connected to power supply Vi by first resistance R 1, the 4th resistance R 4 respectively, and the negative terminal of the outlet side of the first optocoupler U1 and the second optocoupler U2 is connected to the GND end of power supply Vi.Connect the anode of the 3rd optocoupler U3 input side and the negative terminal of the 4th optocoupler U4 input side simultaneously from the anode of the first optocoupler U1 outlet side, the anode of the second optocoupler U2 outlet side connects the negative terminal of the 3rd optocoupler U3 input side and the anode of the 4th optocoupler U4 input side simultaneously.The anode of the 3rd optocoupler U3 and the 4th optocoupler U4 outlet side is connected to power supply Vi by the 5th resistance R 5, the 6th resistance R 6 respectively, the anode of the 3rd optocoupler U3 outlet side and the anode of the 4th optocoupler U4 outlet side are connected simultaneously, testing circuit outputs to the on-off control circuit signal input part with control signal CTR, and the negative terminal of the 3rd optocoupler U3 and the 4th optocoupler U4 outlet side then is connected to the GND end of power supply Vi simultaneously.The anode of light-emitting diode D1 is connected to power supply Vi by the 7th resistance R 7, and the negative terminal of light-emitting diode D1 is connected to the signal input part of on-off control circuit, links to each other with the anode of the 4th optocoupler U4 outlet side simultaneously.Power supply Vi is the on-off control circuit power supply.
Among the utility model second embodiment the on-off control circuit principle as shown in Figure 7, on-off control circuit adopts the relay mode, the relay mode can be applicable to the direct current input or exchanges the operating voltage of input.Described on-off control circuit comprises that switch module and malfunction keep module.Described switch module adopts the closed type electromagnetic relay, and described malfunction keeps module to comprise the first triode VD1, the second triode VD2, the first current-limiting resistance r1, the second current-limiting resistance r2, the 3rd current-limiting resistance r3 and capacitor C.
Control signal CTR is input to the collector electrode of the first triode VD1, base stage and the relay of the second triode VD2 by the first current-limiting resistance r1.The other end of relay is connected to and draws voltage vcc, and the contact connects the input Vout of supply power voltage Vi and power-switching circuit in the relay.The base stage of the first triode VD1 links to each other with the collector electrode of the second triode VD2 by the second current-limiting resistance r2, the series arm ground connection that the collector electrode of the second triode VD2 is formed by the 3rd current-limiting resistance r3 and capacitor C, and the emitter of the first triode VD1 is ground connection also.Draw voltage vcc to provide on the second triode VD2 by starting power supply Vs.
The reference voltage module circuit theory as shown in Figure 8 among the utility model second embodiment, first reference voltage module and second reference voltage module all adopt TL431 chip module that stable reference voltage is provided, the first divider resistance Z1 and second divider resistance Z2 series connection back are in parallel with the TL431 chip, and the reference edge of TL431 chip is connected between the first divider resistance Z1 and the second divider resistance Z2.Reference voltage module adopts voltage-stabiliser tube to realize separately among first embodiment, it is fixed value that voltage-stabiliser tube can only make burning voltage, be subjected to certain limitation in the use, and the reference voltage circuit that adopts TL431 chip module to constitute among second embodiment can carry out the adjustment of voltage stabilizing value by the first divider resistance Z1, the second divider resistance Z2.The maximum voltage stabilizing value of TL431 chip is 36V, for the more high-tension situation of needs, can adopt the mode of reference voltage module cascade.
When initially powering on, the first optocoupler U1, the second optocoupler U2, the 3rd optocoupler U3, the 4th optocoupler U4 ends, the control signal CTR that testing circuit is sent is a high level, the base stage of the second triode VD2 is a high level, the second triode VD2 is in by state, can not charge this moment to capacitor C, the base stage of the first triode VD1 is a low level, the first triode VD1 is in cut-off state, there is not electric current to flow through in the coil of relay at this moment, contact in the relay is in normally off always so, and promptly on-off control circuit is in conducting state, and the power supply in the double loop power supply electric power system provides operating voltage for back level work circuit.
When first power-switching circuit and second source change-over circuit are all working properly, the first optocoupler U1, the second optocoupler U2 conducting, the 3rd optocoupler U3, the 4th optocoupler U4 end, the control signal CTR that testing circuit is sent is always high level, there is not electric current to flow through in the coil of relay at this moment, contact in the relay is in normally off always so, and on-off control circuit is in conducting state, and the power supply in the double loop power supply electric power system provides operating voltage for back level work circuit.
When fault takes place, when the first power-switching circuit no-output or voltage decline to a great extent, the first optocoupler U1, the 4th optocoupler U4 ends, the second optocoupler U2, the 3rd optocoupler U3 conducting, the control signal CTR that testing circuit is sent is a low level, light-emitting diode D1 lights, there is electric current to flow through in the coil in the relay, contact in the relay is cut off, be that on-off control circuit is in off-state, power supply in the double loop power supply electric power system stops to be back level work circuit supply, second triode VD2 conducting this moment, this moment the second triode VD2 on draw voltage to pass through the 3rd current-limiting resistance R3 to charge to capacitor C, when the voltage on the capacitor C arrives certain numerical value, the first triode VD1 conducting, clamp down on the relay input terminal voltage in low level this moment all the time, and malfunction is locked.Even this moment, control signal CTR was changed to high level suddenly because system re-powers immediately, on-off control circuit can not conducting, so can not cause damage to back level work circuit.In addition, because the existence of capacitor charging time can be ignored the interference signals such as burr among the control signal CTR, the stability of enhanced system and reliability.
In like manner, when second source change-over circuit no-output or voltage decline to a great extent, the second optocoupler U2, the 3rd optocoupler U3 end, the first optocoupler U1, the 4th optocoupler U4 conducting, the control signal CTR that testing circuit is sent is a low level, on-off control circuit is in off-state, and keeps malfunction, and light-emitting diode D1 lights.
The utility model the 3rd embodiment circuit theory and second embodiment are roughly the same, and just the on-off control circuit among the 3rd embodiment has been selected the MOSFET mode for use, and as shown in Figure 9, described on-off control circuit comprises that switch module and malfunction keep module.Described switch module adopts N slot field-effect transistor n-MOS, and described malfunction keeps module to comprise the first triode VD1, the second triode VD2, the first current-limiting resistance r1, the second current-limiting resistance r2, the 3rd current-limiting resistance r3 and capacitor C.
Control signal CTR is input to the collector electrode of the first triode VD1, the base stage of the second triode VD2 and the grid of field-effect transistor n-MOS by the first current-limiting resistance r1, the base stage of the first triode VD1 links to each other with the collector electrode of the second triode VD2 by the second current-limiting resistance r2, the series arm ground connection that the collector electrode of the second triode VD2 is formed by the 3rd current-limiting resistance r3 and capacitor C, the emitter of the first triode VD1 is ground connection also.The drain electrode of described field-effect transistor n-MOS connects supply power voltage Vi, and the source electrode of field-effect transistor n-MOS is connected to the input Vout of power-switching circuit.Draw voltage vcc to provide on the second triode VD2 by starting power supply Vs.
When initially powering on, the first optocoupler U1, the second optocoupler U2, the 3rd optocoupler U3, the 4th optocoupler U4 ends, the control signal CTR that testing circuit is sent is a high level, the base stage of the second triode VD2 is a high level, the second triode VD2 is in by state, can not charge this moment to capacitor C, the base stage of the first triode VD1 is a low level, the first triode VD1 is in cut-off state, and the grid voltage of field-effect transistor n-MOS is always high level, there is cut-in voltage between the grid of field-effect transistor n-MOS and the drain electrode, so drain electrode and the source electrode conducting of field-effect transistor n-MOS, be that on-off control circuit is in conducting state, the power supply in the double loop power supply electric power system provides operating voltage for back level work circuit.
When first power-switching circuit and second source change-over circuit are all working properly, the first optocoupler U1, the second optocoupler U2 conducting, the 3rd optocoupler U3, the 4th optocoupler U4 end, the control signal CTR that testing circuit is sent is always high level, on-off control circuit is in conducting state, and the power supply in the double loop power supply electric power system provides operating voltage for back level work circuit.
When fault takes place, when the first power-switching circuit no-output or voltage decline to a great extent, the first optocoupler U1, the 4th optocoupler U4 ends, the second optocoupler U2, the 3rd optocoupler U3 conducting, the control signal CTR that testing circuit is sent is a low level, light-emitting diode D1 lights, there is not cut-in voltage between the grid of field-effect transistor n-MOS and the drain electrode, so drain electrode and the source electrode of field-effect transistor n-MOS end, be that on-off control circuit is in off-state, power supply in the double loop power supply electric power system stops to be back level work circuit supply, second triode VD2 conducting this moment, this moment the second triode VD2 on draw voltage vcc to pass through the 3rd current-limiting resistance r3 to charge to capacitor C, when the voltage on the capacitor C arrives certain numerical value, the first triode VD1 conducting, clamp down on the grid voltage of field-effect transistor n-MOS in low level this moment all the time, and malfunction is locked.Even this moment, control signal CTR was changed to high level suddenly because system re-powers immediately, on-off control circuit can not conducting, so can not cause damage to back level work circuit.
In addition, because the existence of capacitor charging time can not produce response to the interference signals such as burr among the control signal CTR, the stability of enhanced system.When system's operate as normal; control signal CTR is always high level; if the interference signal on space or the circuit enters system at this moment; because the general energy of interference signal is less; disturb the time ratio that produces shorter; so in circuit control signal CTR, may include the negative pulse interference signal; cause in the control signal CTR short time falling and be low level from high level; but revert to high level soon again; this moment is because the existence of capacitor charging time; when control signal CTR becomes low level; the second triode VD2 begins conducting and charges to capacitor C; but also be not charged to when enough making the first triode VD1 conducting at capacitance voltage; control signal CTR transfers high level to by low level, the second triode VD2 by, this moment, the action of on-off control circuit unprotect produced; can ignore for this interference signal, thereby strengthen the stability and the reliability of system.
In like manner, when second source change-over circuit no-output or voltage decline to a great extent, the second optocoupler U2, the 3rd optocoupler U3 end, the first optocoupler U1, the 4th optocoupler U4 conducting, the control signal CTR that testing circuit is sent is a low level, on-off control circuit is in off-state, and keeps malfunction, and light-emitting diode D1 lights.
Explanation by embodiment, when can being to reach technological means and the effect that predetermined purpose takes to be able to more deeply and concrete understanding to the utility model, yet appended diagram only provide with reference to the usefulness of explanation, be not to be used for the utility model is limited.
Claims (10)
1, a kind of back level work circuit protection device of double loop power supply electric power system is characterized in that comprising on-off control circuit and testing circuit;
Described testing circuit is connected the output of two-way power-switching circuit, the operating state of two-way power-switching circuit is detected respectively, and according to testing result output control signal corresponding to described on-off control circuit;
Described on-off control circuit is connected between power supply and the two-way power-switching circuit, according to the control signal control power supply of described testing circuit output and the break-make relation between the two-way power-switching circuit;
Initially powering on and during operate as normal, the control signal of described testing circuit output normal condition, described on-off control circuit is communicated with power supply and two-way power-switching circuit; When in the two-way power-switching circuit break down in arbitrary road, the control signal of described testing circuit output malfunction, described on-off control circuit shutoff power supply is connected with the two-way power-switching circuit.
2, the back level work circuit protection device of double loop power supply electric power system according to claim 1 is characterized in that, described power supply adopts direct current, and described testing circuit and described on-off control circuit are directly powered by power supply;
Described testing circuit comprises first power output circuit, second source output circuit and a comparison circuit, described first power output circuit comprises first resistance (R1), second resistance (R2), first optocoupler (U1) and first reference voltage module, described second source output circuit comprises the 3rd resistance (R3), the 4th resistance (R4), second optocoupler (U2) and second reference voltage module, and described comparison circuit comprises the 3rd optocoupler (U3), the 4th optocoupler (U4), the 5th resistance (R5), the 6th resistance (R6), the 7th resistance (R7) and light-emitting diode (D1);
The output plus terminal of first power-switching circuit (V1+) is connected to the anode of first optocoupler (U1) input side by first resistance (R1), the negative terminal of first optocoupler (U1) input side is connected to the anode of first reference voltage module, the negative terminal of first reference voltage module connects the output negative terminal (V1-) of first power-switching circuit, the output plus terminal of second source change-over circuit (V2+) is connected to the anode of second optocoupler (U2) input side by the 3rd resistance (R3), the negative terminal of second optocoupler (U2) input side is connected to the anode of second reference voltage module, and the negative terminal of second reference voltage module connects the output negative terminal (V2-) of second source change-over circuit;
The anode of first optocoupler (U1) and second optocoupler (U2) outlet side is connected to power supply (Vi) by first resistance (R2), the 4th resistance (R4) respectively, and the negative terminal of the outlet side of first optocoupler (U1) and second optocoupler (U2) is connected to the GND end of power supply (Vi); Connect the anode of the 3rd optocoupler (U3) input side and the negative terminal of the 4th optocoupler (U4) input side simultaneously from the anode of first optocoupler (U1) outlet side, the anode of second optocoupler (U2) outlet side connects the negative terminal of the 3rd optocoupler (U3) input side and the anode of the 4th optocoupler (U4) input side simultaneously; The anode of the 3rd optocoupler (U3) and the 4th optocoupler (U4) outlet side is connected to power supply (Vi) by the 5th resistance (R5), the 6th resistance (R6) respectively, the anode of the 3rd optocoupler (U3) outlet side and the anode of the 4th optocoupler (U4) outlet side are connected simultaneously, and the negative terminal of the 3rd optocoupler (U3) and the 4th optocoupler (U4) outlet side then is connected to the GND end of power supply (Vi) simultaneously; The anode of light-emitting diode (D1) is connected to power supply (Vi) by the 7th resistance (R7), and the negative terminal of light-emitting diode (D1) is connected to described on-off control circuit signal input part.
3, the back level work circuit protection device of double loop power supply electric power system according to claim 1; it is characterized in that; described power supply adopts alternating current; the power supply of described testing circuit and described on-off control circuit provides after power supply (Vs) converts alternating voltage to low-voltage dc power supply by starting, and described startup power supply (Vs) is connected across on the power supply.
4, the back level work circuit protection device of double loop power supply electric power system according to claim 3, it is characterized in that, described testing circuit comprises first power output circuit, second source output circuit and a comparison circuit, described first power output circuit comprises first resistance (R1), second resistance (R2), first optocoupler (U1) and first reference voltage module, described second source output circuit comprises the 3rd resistance (R3), the 4th resistance (R4), second optocoupler (U2) and second reference voltage module, described comparison circuit comprise the 3rd optocoupler (U3), the 4th optocoupler (U4), the 5th resistance (R5), the 6th resistance (R6), the 7th resistance (R7) and light-emitting diode (D1);
The output plus terminal of first power-switching circuit (V1+) is connected to the anode of first optocoupler (U1) input side by first resistance (R1), the negative terminal of first optocoupler (U1) input side is connected to the anode of first reference voltage module, the negative terminal of first reference voltage module connects the output negative terminal (V1-) of first power-switching circuit, the output plus terminal of second source change-over circuit (V2+) is connected to the anode of second optocoupler (U2) input side by the 3rd resistance (R3), the negative terminal of second optocoupler (U2) input side is connected to the anode of second reference voltage module, and the negative terminal of second reference voltage module connects the output negative terminal (V2-) of second source change-over circuit;
The anode of first optocoupler (U1) and second optocoupler (U2) outlet side is connected to by first resistance (R2), the 4th resistance (R4) respectively and starts power supply (Vs), and the negative terminal of the outlet side of first optocoupler (U1) and second optocoupler (U2) is connected to the GND end that starts power supply (Vs); Connect the anode of the 3rd optocoupler (U3) input side and the negative terminal of the 4th optocoupler (U4) input side simultaneously from the anode of first optocoupler (U1) outlet side, the anode of second optocoupler (U2) outlet side connects the negative terminal of the 3rd optocoupler (U3) input side and the anode of the 4th optocoupler (U4) input side simultaneously; The anode of the 3rd optocoupler (U3) and the 4th optocoupler (U4) outlet side is connected to by the 5th resistance (R5), the 6th resistance (R6) respectively and starts power supply (Vs), the anode of the 3rd optocoupler (U3) outlet side and the anode of the 4th optocoupler (U4) outlet side are connected simultaneously, and the negative terminal of the 3rd optocoupler (U3) and the 4th optocoupler (U4) outlet side then is connected to the GND end that starts power supply (Vs) simultaneously; The anode of light-emitting diode (D1) is connected to by the 7th resistance (R7) and starts power supply (Vs), and the negative terminal of light-emitting diode (D1) is connected to described on-off control circuit signal input part.
5, the back level work circuit protection device of double loop power supply electric power system according to claim 2 is characterized in that, described reference voltage module adopts voltage-stabiliser tube or TL431 chip module that reference voltage is provided.
6, the back level work circuit protection device of double loop power supply electric power system according to claim 4 is characterized in that, described reference voltage module adopts voltage-stabiliser tube or TL431 chip module that reference voltage is provided.
According to the back level work circuit protection device of any described double loop power supply electric power system in the claim 1 to 6, it is characterized in that 7, described on-off control circuit comprises that switch module and malfunction keep module;
Described malfunction keeps module to comprise first triode (VD1), second triode (VD2), first current-limiting resistance (r1), second current-limiting resistance (r2), the 3rd current-limiting resistance (r3) and electric capacity (C), the collector electrode of described first current-limiting resistance (r1) and described first triode (VD1), the base stage of described second triode (VD2) links to each other with the base stage of described break-make control triode (VD3), the base stage of described first triode (VD1) links to each other with the collector electrode of described second triode (VD2) by described second current-limiting resistance (r2), the series arm ground connection that the collector electrode of described second triode (VD2) is formed by described the 3rd current-limiting resistance (r3) and described electric capacity (C), the emitter of described first triode (VD1) is ground connection also, the collector electrode of described break-make control triode (VD3) connects supply power voltage (Vi), and the emitter of break-make control triode (VD3) is connected to the input (Vout) of power-switching circuit.
8, the back level work circuit protection device of double loop power supply electric power system according to claim 7 is characterized in that, described switch module adopts break-make triode (VD3).
9, the back level work circuit protection device of double loop power supply electric power system according to claim 7 is characterized in that, described switch module adopts the closed type electromagnetic relay.
10, the back level work circuit protection device of double loop power supply electric power system according to claim 7 is characterized in that, described switch module adopts field effect transistor M OSFET.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201180783U CN201213222Y (en) | 2008-06-10 | 2008-06-10 | Rear stage working circuit protecting device for dual path electric power supplying system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201180783U CN201213222Y (en) | 2008-06-10 | 2008-06-10 | Rear stage working circuit protecting device for dual path electric power supplying system |
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| CN201213222Y true CN201213222Y (en) | 2009-03-25 |
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| CNU2008201180783U Expired - Fee Related CN201213222Y (en) | 2008-06-10 | 2008-06-10 | Rear stage working circuit protecting device for dual path electric power supplying system |
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| CN112578834A (en) * | 2019-09-29 | 2021-03-30 | 东莞东骅电子科技有限公司 | Output voltage stabilizing circuit |
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| CN111668810B (en) * | 2020-05-08 | 2023-08-04 | 深圳市优必选科技股份有限公司 | Power supply control circuit and robot |
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