CN201846067U - Circuit for real time monitoring and carefully protecting power supply - Google Patents
Circuit for real time monitoring and carefully protecting power supply Download PDFInfo
- Publication number
- CN201846067U CN201846067U CN2010205953190U CN201020595319U CN201846067U CN 201846067 U CN201846067 U CN 201846067U CN 2010205953190 U CN2010205953190 U CN 2010205953190U CN 201020595319 U CN201020595319 U CN 201020595319U CN 201846067 U CN201846067 U CN 201846067U
- Authority
- CN
- China
- Prior art keywords
- resistance
- voltage source
- circuit
- output
- negative pole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses a circuit for real time monitoring and carefully protecting a power supply, relates to a power supply protecting circuit, and aims at providing a circuit capable of real time monitoring and carefully protecting a voltage source under the unattended condition. The circuit comprises a voltage source input protection circuit, a voltage source output protection circuit, an overheat protection circuit and a singlechip control circuit, wherein the output ends of the voltage source input protection circuit, the voltage source output protection circuit and the overheat protection circuit are respectively connected with a singlechip. When the phenomena of overvoltage, undervoltage, overcurrent and overheat occur, the singlechip outputs control signals for switching off the voltage source. The circuit can set various work and protection states of the power supply by software according to system requirements, and can be applied to power protection for systems such as communication systems, program control systems, radar systems and the like.
Description
Technical field
The utility model relates to a kind of circuit, relates in particular to a kind of power protecting circuit.
Background technology
The development of modern electronic technology has proposed more and more higher requirement to the function of power protection of equipment.Such as fields such as communication, program control, radar systems, the defencive function of power-supply system is required higher, especially to unattended electronic equipment, more require power-supply system to realize that intelligent monitoring and protection move normally to guarantee system safety.The protection of power supply mainly divides input and output overvoltage protection, output under-voltage protection, output overcurrent protection, overtemperature protection etc.Traditional analog circuit implementation is as follows:
1. output over-voltage protection circuit
The generation of various overpressure situation can cause that checkout equipment lost efficacy and the control IC damage.When overvoltage condition occurring, at first to protect load, in case when overvoltage takes place, start overvoltage crowbar immediately, stop the vibration of power supply.Traditional analog circuit often adopts voltage stabilizing didoe to detect voltage output end, and when output overvoltage, voltage stabilizing didoe punctures the generation leakage current, again this current signal is fed back to elementary control chip by the light lotus root, realizes the protection to late-class circuit and load.
2. output under-voltage protecting circuit
When the circuit that keeps reference voltage breaks down, take load current when excessive, usually cause output voltage to reduce unusually, the safety for the protection load device should be equipped with under-voltage protecting circuit.The protected mode of conventional power source is generally by electric resistance partial pressure and turn-off control chip and realize defencive function.
3. output overcurrent protective circuit
When lead-out terminal operating mistake or load device damage, over-current phenomenon avoidance will often take place.For protection power supply module safety, current foldback circuit need be set.Traditional components and parts of doing overcurrent protection have circuit breaker, fuse, resettable fuse etc.
4. overheating protection circuit
When the unusual situation about raising of the inner occurrence temperature of power supply,, prevent that fire from taking place, and need be provided with overheating protection circuit in order to protect the power supply intraware.Detector unit commonly used has temperature switch, semistor and fuse and molten cable, generally is mounted on the main circuit, and when it moves, can the deenergization power supply.
Real-time observation circuit of power supply and protective circuit adopt analog circuit to design, possess the characteristics such as timely that respond, but its limitation is also bigger, at first because the precision of components and parts such as voltage stabilizing didoe influences, its protection point amplitude is bigger, can not accomplish meticulous protection, and in case design is definite, voltage, electric current, the isoparametric protection range of ambient temperature are all immutable, and is therefore relatively poor to the adaptive capacity of different environments for use, limited its scope of application; Simultaneously, because it can not realize the intelligent monitoring of power supply and report, can not satisfy user demand to the electronic equipment that much has higher requirements.
Summary of the invention
When self-protection when needs satisfy under the accurate limited field of above-mentioned needs, intelligent monitoring, the unattended operation situation power supply unusual fluctuation, power supply self-recovery, data such as report at condition; the defencive function of power supply is used traditional analog circuit implementation and can not be met the demands; need more perfect, more intelligentized solution, to improve the adaptive capacity of power-supply system.The utility model has overcome above-mentioned deficiency; a kind of voltage, electric current, temperature data gathered in real time accurately is provided, flowed to the single-chip microcomputer analysis and focus on, and shown fault type; send fault-signal to system, in time control the power supply of switching-on and switching-off state and implement monitoring and protective circuit.
The utility model adopts following scheme: the utility model comprises overvoltage crowbar, under-voltage protecting circuit, current foldback circuit, overheating protection circuit, it is characterized in that this circuit also comprises voltage source input protection circuit, voltage source output protection circuit, overheating protection circuit, single chip machine controlling circuit; Described overheating protection circuit comprises the temperature sampling chip, and temperature sampling chip temperature signal output part is connected with the single-chip microcomputer input pin; Described voltage source input protection circuit comprises overvoltage crowbar one, under-voltage protecting circuit one; Described voltage source output protection circuit comprises overvoltage crowbar two, under-voltage protecting circuit two, current foldback circuit;
The input of described overvoltage crowbar one, under-voltage protecting circuit one links to each other with the input of monitored voltage source; The input of described overvoltage crowbar two, under-voltage protecting circuit two links to each other with the output of monitored voltage source, and the input of described current foldback circuit links to each other with the output of monitored voltage source by current sampling resistor; The output of described overvoltage crowbar one, under-voltage protecting circuit one, overvoltage crowbar two, under-voltage protecting circuit two, current foldback circuit connects with the different input pins of single-chip microcomputer respectively; An output pin of described single-chip microcomputer is connected with monitored voltage source switch signal input part.
The utlity model has following advantage:
A. owing to adopted high-precision divider resistance, current sampling resistor and temperature sampling resistance that voltage signal, current signal and temperature are sampled, with the single-chip microcomputer analysis with focus on fault message, the utility model possesses precise monitoring voltage failure situation;
B. single-chip microcomputer is when receiving fault-signal, show malfunction, its output control signal is turn-offed monitored voltage source simultaneously, stops it and powers to load circuit, realized under unattended situation, effectively protecting monitored power supply and follow-up load circuit, guaranteed the safe operation of whole system;
C. the utility model can adopt different monitoring and protected mode to voltage source input, output end voltage according to various work and the guard mode of system requirements by the software setting power supply, has realized the meticulous defencive function of voltage source.
Description of drawings
Fig. 1 is the utility model system block diagram.
Fig. 2 is the utility model voltage source input protection circuit schematic diagram.
Fig. 3 is the utility model voltage source output overvoltage, under-voltage, current foldback circuit schematic diagram.
Fig. 4 is the utility model single chip machine controlling circuit schematic diagram.
Fig. 5 is the utility model single chip machine controlling circuit workflow diagram.
Embodiment
Be described further of the present utility model below in conjunction with accompanying drawing.
Monitored voltage source is accepted the High AC voltage signal from the ac high-voltage voltage source, and with its rectification, step-down be+/-three road d. c. voltage signals of 12V, 3.3V, 5V power for follow-up load circuit.In order to protect monitored voltage source and follow-up load circuit, need monitor the input voltage signal of monitored voltage source, the voltage signal of output, the current signal of exporting to follow-up load circuit and circuit ambient temperature.
Fig. 1 is the utility model system block diagram.The utility model comprises voltage source input protection circuit, voltage source output protection circuit, overheating protection circuit, single chip machine controlling circuit; Described voltage source input protection circuit comprises overvoltage crowbar one, under-voltage protecting circuit one; Described voltage source output protection circuit comprises 12V direct voltage output over-voltage protection circuit; 12V direct voltage output under-voltage protecting circuit;-12V direct voltage output over-voltage protection circuit;-12V direct voltage output under-voltage protecting circuit; 5V direct voltage output over under-voltage protection circuit; 3.3V direct voltage output over under-voltage protection circuit; +/-12V DC-voltage supply loop current foldback circuit; 5V DC-voltage supply loop current foldback circuit; 3.3V DC-voltage supply loop current foldback circuit.
Foregoing circuit adopts the temperature sampling chip that the circuit ambient temperature is sampled; the signal encoding of output representation temperature is to the single-chip processor i/o mouth; by single-chip microcomputer signal encoding is translated into temperature data; when exceeding overtemperature protection point, temperature closes monitored voltage source; this moment, single-chip microcomputer quit work, and restarted monitored voltage source after staff's maintenance finishes.
Above-mentioned each over under-voltage protection circuit all adopts the high accuracy voltage grading resistor that output voltage is sampled, send into comparator and reference voltage compares, form a voltage window, when the input and output voltage signal of monitored voltage source is within the overvoltage/undervoltage limit range, over under-voltage protection circuit output high level; When overvoltage or under-voltage phenomenon appear in the input of monitored voltage source, overvoltage crowbar one or under-voltage protecting circuit one output low level are delivered to the single-chip processor i/o mouth, single-chip microcomputer output fault-signal is powered-down simultaneously, this moment, single-chip microcomputer quit work, and restarted monitored voltage source after staff's maintenance finishes; When overvoltage or under-voltage phenomenon appearred in the output of monitored voltage source, the overvoltage of monitored voltage output terminal or under-voltage protecting circuit output low level were to the single-chip processor i/o mouth, and single-chip microcomputer output fault-signal is closed monitored voltage source simultaneously.After this, single-chip microcomputer carries out periodic scan to the voltage signal of monitored voltage output terminal, when the overvoltage of monitored voltage output terminal and under-voltage phenomenon are all eliminated, and single-chip microcomputer output starting-up signal, monitored voltage source is resumed work.
Above-mentioned current foldback circuit employing resistance is little, the high-precision current sampling resistor is sampled to the electric current of monitored voltage output terminal; obtain one with the linear magnitude of voltage (being generally tens millivolts) of size of current; utilize amplifier that this voltage is amplified, send into comparator again and reference voltage compares.When output current during less than over-current protection point, current foldback circuit output high level is to the single-chip processor i/o mouth.When output current during greater than over-current protection point, then output low level is to the single-chip processor i/o mouth for current foldback circuit, and single-chip microcomputer output this moment fault-signal is powered-down simultaneously.After this, single-chip microcomputer carries out periodic scan to the current signal of monitored voltage output terminal, when over-current phenomenon avoidance is eliminated, and single-chip microcomputer output starting-up signal, monitored voltage source is resumed work.
Fig. 2 is monitored voltage source input protection circuit schematic diagram.The voltage source input protection circuit comprises reference voltage generating circuit one, overvoltage sample circuit one, under-voltage sample circuit one, overvoltage crowbar one, under-voltage protecting circuit one.
Described reference voltage generating circuit one comprises resistance R 01, resistance R 02, and described resistance R 01 is connected with resistance R 02, and described resistance R 01 other end is connected with the anodal VA+ of reference voltage source, and described resistance R 02 other end is connected with reference voltage source negative pole VA-.
Described overvoltage sample circuit one comprises resistance R 03, resistance R 04, described resistance R 03 is connected with resistance R 04, described resistance R 03 other end is connected with monitored voltage source input anode Vin+, and described resistance R 04 other end is connected with monitored voltage source input cathode Vin-.
Described under-voltage sample circuit one comprises resistance R 05, resistance R 06, described resistance R 05 is connected with resistance R 06, described resistance R 05 other end is connected with monitored voltage source input anode Vin+, and described resistance R 06 other end is connected with monitored voltage source input cathode Vin-.
Described overvoltage crowbar one comprises comparator U11A, diode D01, field effect transistor Q01, photoelectrical coupler U01, resistance R 09, resistance R 11, resistance R 12; Described comparator U11A normal phase input end is connected with resistance R 04 public connecting end with resistance R 03, comparator U11A inverting input is connected with resistance R 02 public connecting end with resistance R 01, comparator U11A output is connected with diode D01 is anodal, and diode D01 negative pole is connected with field effect transistor Q01 grid by resistance R 09; Described field effect transistor Q01 drain electrode is connected by the anodal VA+ of resistance R 11 and reference voltage source, and its source electrode is connected with reference voltage source negative pole VA-; Light-emitting diode is anodal among the described photoelectrical coupler U01 is connected with field effect transistor Q01 drain electrode, the light-emitting diode negative pole is connected with reference voltage source negative pole VA-by resistance R 12 among the photoelectrical coupler U01, transistor collector is connected with voltage source two anodal VB+ in the photoelectrical coupler, transistor emitter connects voltage source two negative pole VB-in the photoelectrical coupler, simultaneously, transistor emitter is connected with single-chip microcomputer as overvoltage signal output part one in the photoelectrical coupler.
Described under-voltage protecting circuit one comprises comparator U12A, diode D02, field effect transistor Q01, photoelectrical coupler U01, resistance R 09, resistance R 11, resistance R 12; Described comparator U12A normal phase input end is connected with resistance R 02 public connecting end with resistance R 01, comparator U12A inverting input is connected with resistance R 06 public connecting end with resistance R 05, comparator U12A output is connected with diode D02 is anodal, and diode D02 negative pole is connected with field effect transistor Q01 grid by resistance R 09; Described field effect transistor Q01 drain electrode is connected by the anodal VA+ of resistance R 11 and reference voltage source, and its source electrode is connected with reference voltage source negative pole VA-; Light-emitting diode is anodal among the described photoelectrical coupler U01 is connected with field effect transistor Q01 drain electrode, the light-emitting diode negative pole is connected with reference voltage source negative pole VA-by resistance R 12 among the photoelectrical coupler U01, transistor collector is connected with voltage source two anodal VB+ among the photoelectrical coupler U01, transistor emitter connects voltage source two negative pole VB-among the photoelectrical coupler U01, simultaneously, transistor emitter is connected with single-chip microcomputer as under-voltage signal output part one among the photoelectrical coupler U01.
Wherein, resistance R 01, resistance R 03, resistance R 05 are variable resistor; Comparator U11A output is connected with the anodal VA+ of reference voltage source by pull-up resistor R07; Described comparator U12A output is connected with the anodal VA+ of reference voltage source by pull-up resistor R08; Described field effect transistor Q01 is the N channel-type; Described voltage source two and monitored voltage source, the equal electrical isolation of reference voltage source.
Described voltage source output protection circuit comprises 12V direct voltage output over-voltage protection circuit; 12V direct voltage output under-voltage protecting circuit;-12V direct voltage output over-voltage protection circuit;-12V direct voltage output under-voltage protecting circuit; 5V direct voltage output over under-voltage protection circuit; 3.3V direct voltage output over under-voltage protection circuit; +/-12V DC-voltage supply loop current foldback circuit; 5V DC-voltage supply loop current foldback circuit; 3.3V DC-voltage supply loop current foldback circuit.
Because 12V ,-12V, 5V, the overvoltage crowbar of 3.3V direct voltage source, under-voltage protecting circuit, current foldback circuit have identical circuit structure, therefore do not describe the structure of above-mentioned each overvoltage, under-voltage, current foldback circuit respectively,
And with 12V ,-overvoltage crowbar of 12V, 5V, 3.3V direct voltage source is referred to as overvoltage crowbar two; with 12V ,-under-voltage protecting circuit of 12V, 5V, 3.3V direct voltage source is referred to as under-voltage protecting circuit two, with 12V ,-current protecting circuit of 12V, 5V, 3.3V direct voltage source is referred to as current protecting circuit.
Fig. 3 is monitored voltage source output overvoltage, under-voltage, current foldback circuit schematic diagram.The voltage source output protection circuit comprises reference voltage generating circuit two, overvoltage sample circuit two, under-voltage sample circuit two, overvoltage crowbar two, under-voltage protecting circuit two, current sampling resistor, current foldback circuit.
Described reference voltage generating circuit two comprises three terminal regulator U21, resistance R 26, resistance R 27; Described three terminal regulator U21 input is connected with the anodal Vout+ of monitored voltage output terminal, and three terminal regulator U21 ground end is connected with monitored voltage output terminal negative pole Vout-; Resistance R 26 is connected with resistance R 27, and resistance R 26 other ends are connected with three-terminal voltage-stabilizing pipe U21 output, and resistance R 27 other ends are connected with three terminal regulator U21 ground end.
Described overvoltage sample circuit two comprises resistance R 24, resistance R 25, and resistance R 24 is connected with resistance R 25, and resistance R 24 other ends are connected with the anodal Vout+ of monitored voltage output terminal, and resistance R 25 other ends are connected with monitored voltage output terminal negative pole Vout-.
Described under-voltage sample circuit two comprises resistance R 22, resistance R 23, and resistance R 22 is connected with resistance R 23, and resistance R 22 other ends are connected with the anodal Vout+ of monitored voltage output terminal, and resistance R 23 other ends are connected with monitored voltage output terminal negative pole Vout-.
Described overvoltage protection resistance two comprises comparator U13, photoisolator U02, resistance R 34, resistance R 51; Described comparator U13 normal phase input end is connected with resistance R 24, resistance R 25 public connecting ends, and its inverting input is connected with the public connecting end of resistance R 26, resistance R 27, and its output is connected with the light-emitting diode among the photoelectrical coupler U02 is anodal; Light-emitting diode negative pole among the described photoelectrical coupler U02 is connected with monitored voltage source negative pole Vout-by resistance R 34; Transistor collector among the photoelectrical coupler U02 is connected with voltage source two anodal VB+, and emitter is connected with voltage source two negative pole VB-by resistance R 51, and simultaneously, emitter also is connected with single-chip microcomputer as overvoltage signal output part two.
Described under-voltage protection resistance two comprises comparator U14, photoisolator U03, resistance R 35, resistance R 52; Described comparator U14 inverting input is connected with resistance R 22, resistance R 23 public connecting ends, and its normal phase input end is connected with the public connecting end of resistance R 26, resistance R 27, and its output is connected with the light-emitting diode among the photoelectrical coupler U03 is anodal; Light-emitting diode negative pole among the described photoelectrical coupler U03 is connected with monitored voltage source negative pole Vout-by resistance R 35; Transistor collector among the photoelectrical coupler U03 is connected with voltage source two anodal VB+, and emitter is connected with voltage source two negative pole VB-by resistance R 52, and simultaneously, emitter also is connected with single-chip microcomputer as under-voltage signal output part two.
Described current sampling resistor R21 is connected between monitored voltage output terminal negative pole Vout-and the load circuit negative pole Vout-a, be that current sampling resistor R21 one end is connected with monitored voltage output terminal negative pole Vout-, the other end is connected with load circuit negative pole Vout-a.
Described current foldback circuit comprises operational amplifier U15, comparator U16, photoelectrical coupler U04, resistance R 42, resistance R 43, resistance R 41, resistance R 37, resistance R 53; Described operational amplifier U15 inverting input is connected with monitored voltage source negative pole by resistance R 42, the end that resistance R 42 is connected with monitored voltage source negative pole should connect an end of monitored voltage output terminal negative pole near resistance R 21, could guarantee that like this sampled voltage is the voltage on the R42.Operational amplifier U15 normal phase input end is connected with the end that current sampling resistor R21 is connected to load circuit negative pole Vout-a by resistance R 43, operational amplifier U15 output is connected with its inverting input by resistance R 41, and the output of operational amplifier U15 also is connected with the normal phase input end of comparator U16; Described comparator U16 inverting input links to each other with the public connecting end of resistance R 26, resistance R 27, and its output is connected with the light-emitting diode among the photoelectrical coupler U04 is anodal; Light-emitting diode negative pole among the described photoelectrical coupler U04 is connected with monitored voltage output terminal negative pole Vout-by resistance R 37; Transistor collector among the photoelectrical coupler U04 is connected with voltage source two anodal VB+, and emitter is connected with voltage source two negative pole VB-by resistance R 53, and simultaneously, its emitter also is connected with single-chip microcomputer as the over-current signal output.
Wherein, resistance R 22, resistance R 24, resistance R 26 are variable resistor; Three terminal regulator U21 is the three terminal regulator of fixing output 5V; Comparator U13 output is connected with the output of three terminal regulator U21 by pull-up resistor R31; Described comparator U14 output is connected with the output of three terminal regulator U21 by pull-up resistor R32; Comparator U16 output is connected with the output of three terminal regulator U21 by pull-up resistor R36; Described operational amplifier U15 output is connected with the output of three terminal regulator U21 by pull-up resistor R33; Described voltage source two and monitored voltage source, the equal electrical isolation of reference voltage source.
Wherein, the anodal Vout+ of the monitored voltage output terminal in 12V direct voltage overvoltage crowbar, under-voltage protecting circuit is 12V, monitored voltage output terminal negative pole Vout-ground connection; The anodal Vout+ of monitored voltage output terminal in-12V direct voltage overvoltage crowbar, the under-voltage protecting circuit is 5V, and monitored voltage output terminal negative pole Vout-is-12V.+/-12V DC-voltage supply loop current current foldback circuit in, current sampling resistor one end is connected with load circuit negative pole Vout-a, the monitored voltage output terminal of another termination-12V output.
The anodal Vout+ of monitored voltage output terminal in 5V direct voltage overvoltage crowbar, under-voltage protecting circuit is 5V, monitored voltage output terminal negative pole Vout-ground connection.In 5V DC-voltage supply loop current current foldback circuit, current sampling resistor one end is connected with load circuit negative pole Vout-a, the monitored voltage output terminal negative pole of another termination Vout-.
The anodal Vout+ of monitored voltage output terminal in 3.3V direct voltage overvoltage crowbar, under-voltage protecting circuit is 3.3V, monitored voltage output terminal negative pole Vout-ground connection.In 3.3V DC-voltage supply loop current current foldback circuit, current sampling resistor one end is connected with load circuit negative pole Vout-a, the monitored voltage output terminal negative pole of another termination Vout-.
Fig. 4 is the utility model single chip machine controlling circuit schematic diagram.Single-chip microcomputer U22 pin P1.0 is connected with transistor emitter among the photoelectrical coupler U01, pin P1.2 links to each other with-12V direct voltage under-voltage protecting circuit output, pin P1.3 links to each other with 12V direct voltage under-voltage protecting circuit output, pin P1.4 links to each other with-12V direct voltage overvoltage crowbar output, pin P1.5 links to each other with 12V direct voltage overvoltage crowbar output, pin P1.6 links to each other with 5V direct voltage overvoltage crowbar output, pin P1.6 also links to each other with 5V direct voltage under-voltage protecting circuit output, pin P1.7 links to each other with 3.3V direct voltage overvoltage crowbar output, and pin P1.7 also links to each other with 3.3V direct voltage under-voltage protecting circuit output; Pin P2.1 is connected with the output of temperature sampling chip; Pin P2.2 with+/-12V direct voltage output overcurrent protective circuit output is connected; Pin P2.3 is connected with 5V direct voltage output overcurrent protective circuit output; Pin P2.4 is connected with 3.3V direct voltage output overcurrent protective circuit output; Pin pin P1.1 inserts remote signal, and is effectively low; Pin P2.0 is connected with forcing starting-up signal, and is effectively high.When above-mentioned over under-voltage protection circuit detects monitored voltage source and overvoltage, under-voltage, overcurrent or superheating phenomenon occur and take place; overvoltage, under-voltage, overcurrent or superheating phenomenon have taken place in pin P1.2 ~ P1.7, P2.1, P2.2, P2.3, the corresponding low level that is output as of P2.4, notice single-chip microcomputer U22 monitoring voltage source.
Output signal A represents holding state among Fig. 4, and is effectively high; Output signal B represents operating state, and is effectively high; Output signal C represents fault, and is effectively low.Output signal B is connected with the switch controlling signal input of the monitored voltage source of control, when output signal B when low, monitored voltage source shutoff; B puts height when output signal, monitored voltage source start.
When opening electricity, the auxiliary power circuit and the single chip circuit of circuit enter operating state, this moment, main circuit was not worked, power supply enters self check, whether the inspection input voltage is in the normal range (NR), whether output has short circuit phenomenon, whether the power module temperature is too high, whether the accessory power supply part exists fault, all are normal as self check, signal A provides high level, the corresponding standby yellow indicator lamp of panel is bright, as abnormal conditions appears, and signal C is a low level, the red caution of panel indicator light is bright, A, B are low level, the System Reports fault; After holding state is correct, with main circuit input control line ground connection, make main circuit start working (main circuit be low level control), self check this moment partly begin to check input, output voltage whether in normal range (NR), whether abnormal heating, output current in normal range (NR) for power supply, normal as all, signal B is a high level, the corresponding work of panel green indicating lamp is bright, the System Reports operate as normal, signal A is a low level, standby indicating lamp is gone out; As abnormal conditions appears, and signal C is a low level, and the red caution of panel indicator light is bright, and A, B are low level, the System Reports fault.
Further specify the utility model workflow in conjunction with Fig. 5 more below.At first monitoring forces whether starting-up signal P2.0 is high, if P2.0 is high, then output signal A is low, and B, C are high, monitored voltage source start, if P2.0 is low, then scan P1.0, P2.1, P1.1, if P1.0, P2.1 arbitrary be low level, no matter P1.1 is a height is low, then exporting A is that low level, B are that low level, C are low level, and this moment, monitored voltage source turn-offed, EP (end of program); If P1.0, P2.1, P1.1 are high level, then exporting A is that high level, B are that low level, C are high level, monitored voltage source is that holding state still keeps turn-offing, after this, cycle detection P1.0, P2.1, P1.1, up to P1.0, P2.1 is that high level, P1.1 are low level, and then exporting A is that low level, B are that high level, C are high level, monitored voltage source start.It is some to delay time, scan P1.2 ~ P1.7, P2.2 ~ P2.4 successively, if low level appears in wherein arbitrary pin, then exporting A is that low level, B are that low level, C are low level, monitored voltage source turn-offs, if P1.2 ~ P1.7, P2.2 ~ P2.4 are high, output A is that low level, B are that high level, C are high level, monitored voltage source operate as normal.Fig. 5 is the utility model single chip machine controlling circuit workflow diagram.
Claims (5)
1. power supply monitoring and meticulous protective circuit in real time, comprise overvoltage crowbar, under-voltage protecting circuit, current foldback circuit, overheating protection circuit, it is characterized in that this circuit also comprises voltage source input protection circuit, voltage source output protection circuit, single chip machine controlling circuit; Described overheating protection circuit comprises the temperature sampling chip, and temperature sampling chip temperature signal output part is connected with the single-chip microcomputer input pin; Described voltage source input protection circuit comprises overvoltage crowbar one, under-voltage protecting circuit one; Described voltage source output protection circuit comprises overvoltage crowbar two, under-voltage protecting circuit two, current sampling resistor, current foldback circuit;
The input of described overvoltage crowbar one, under-voltage protecting circuit one links to each other with the input of monitored voltage source; The input of described overvoltage crowbar two, under-voltage protecting circuit two links to each other with the output of monitored voltage source, described current sampling resistor is series between the negative pole of output end and load circuit negative pole of monitored voltage source, and the input of described current foldback circuit links to each other with the end that current sampling resistor is connected to the load circuit negative pole; The output of described overvoltage crowbar one, under-voltage protecting circuit one, overvoltage crowbar two, under-voltage protecting circuit two, current foldback circuit connects with the different input pins of single-chip microcomputer respectively; An output pin of described single-chip microcomputer is connected with monitored voltage source switch signal input part.
2. power supply according to claim 1 is monitoring and meticulous protective circuit in real time, it is characterized in that described voltage source input protection circuit also comprises reference voltage generating circuit one, overvoltage sample circuit one, under-voltage sample circuit one;
Described reference voltage generating circuit one comprises resistance R 01, resistance R 02, and described resistance R 01 is connected with resistance R 02, and described resistance R 01 other end is connected with the anodal VA+ of reference voltage source, and described resistance R 02 other end is connected with reference voltage source negative pole VA-;
Described overvoltage sample circuit one comprises resistance R 03, resistance R 04, described resistance R 03 is connected with resistance R 04, described resistance R 03 other end is connected with monitored voltage source input anode Vin+, and described resistance R 04 other end is connected with monitored voltage source input cathode Vin-;
Described under-voltage sample circuit one comprises resistance R 05, resistance R 06, described resistance R 05 is connected with resistance R 06, described resistance R 05 other end is connected with monitored voltage source input anode Vin+, and described resistance R 06 other end is connected with monitored voltage source input cathode Vin-;
Described overvoltage crowbar one comprises comparator U11A, diode D01, field effect transistor Q01, photoelectrical coupler U01, resistance R 09, resistance R 11, resistance R 12; Described comparator U11A normal phase input end is connected with resistance R 04 public connecting end with resistance R 03, comparator U11A inverting input is connected with resistance R 02 public connecting end with resistance R 01, comparator U11A output is connected with diode D01 is anodal, and diode D01 negative pole is connected with field effect transistor Q01 grid by resistance R 09; Described field effect transistor Q01 drain electrode is connected by the anodal VA+ of resistance R 11 and reference voltage source, and its source electrode is connected with reference voltage source negative pole VA-; Light-emitting diode is anodal among the described photoelectrical coupler U01 is connected with field effect transistor Q01 drain electrode, the light-emitting diode negative pole is connected with reference voltage source negative pole VA-by resistance R 12 among the photoelectrical coupler U01, transistor collector is connected with voltage source two anodal VB+ in the photoelectrical coupler, transistor emitter connects voltage source two negative pole VB-in the photoelectrical coupler, simultaneously, transistor emitter is connected with single-chip microcomputer as overvoltage signal output part one in the photoelectrical coupler;
Described under-voltage protecting circuit one comprises comparator U12A, diode D02, field effect transistor Q01, photoelectrical coupler U01, resistance R 09, resistance R 11, resistance R 12; Described comparator U12A normal phase input end is connected with resistance R 02 public connecting end with resistance R 01, comparator U12A inverting input is connected with resistance R 06 public connecting end with resistance R 05, comparator U12A output is connected with diode D02 is anodal, and diode D02 negative pole is connected with field effect transistor Q01 grid by resistance R 09; Described field effect transistor Q01 drain electrode is connected by the anodal VA+ of resistance R 11 and reference voltage source, and its source electrode is connected with reference voltage source negative pole VA-; Light-emitting diode is anodal among the described photoelectrical coupler U01 is connected with field effect transistor Q01 drain electrode, the light-emitting diode negative pole is connected with reference voltage source negative pole VA-by resistance R 12 among the photoelectrical coupler U01, transistor collector is connected with voltage source two anodal VB+ among the photoelectrical coupler U01, transistor emitter connects voltage source two negative pole VB-among the photoelectrical coupler U01, simultaneously, transistor emitter is connected with single-chip microcomputer as under-voltage signal output part one among the photoelectrical coupler U01.
3. power supply according to claim 2 is monitoring and meticulous protective circuit in real time, it is characterized in that resistance R 01, resistance R 03, resistance R 05 are variable resistor; Comparator U11A output is connected with the anodal VA+ of reference voltage source by pull-up resistor R07; Described comparator U12A output is connected with the anodal VA+ of reference voltage source by pull-up resistor R08; Described field effect transistor Q01 is the N channel-type; Described voltage source two and monitored voltage source, the equal electrical isolation of reference voltage source.
4. power supply according to claim 1 is monitoring and meticulous protective circuit in real time, it is characterized in that described voltage source output protection circuit also comprises reference voltage generating circuit two, overvoltage sample circuit two, under-voltage sample circuit two, current sampling resistor;
Described reference voltage generating circuit two comprises three terminal regulator U21, resistance R 26, resistance R 27; Described three terminal regulator U21 input is connected with the anodal Vout+ of monitored voltage output terminal, and three terminal regulator U21 ground end is connected with monitored voltage output terminal negative pole Vout-; Resistance R 26 is connected with resistance R 27, and resistance R 26 other ends are connected with three-terminal voltage-stabilizing pipe U21 output, and resistance R 27 other ends are connected with three terminal regulator U21 ground end;
Described overvoltage sample circuit two comprises resistance R 24, resistance R 25, and resistance R 24 is connected with resistance R 25, and resistance R 24 other ends are connected with the anodal Vout+ of monitored voltage output terminal, and resistance R 25 other ends are connected with monitored voltage output terminal negative pole Vout-;
Described under-voltage sample circuit two comprises resistance R 22, resistance R 23, and resistance R 22 is connected with resistance R 23, and resistance R 22 other ends are connected with the anodal Vout+ of monitored voltage output terminal, and resistance R 23 other ends are connected with monitored voltage output terminal negative pole Vout-;
Described overvoltage protection resistance two comprises comparator U13, photoisolator U02, resistance R 34, resistance R 51; Described comparator U13 normal phase input end is connected with resistance R 24, resistance R 25 public connecting ends, and its inverting input is connected with the public connecting end of resistance R 26, resistance R 27, and its output is connected with the light-emitting diode among the photoelectrical coupler U02 is anodal; Light-emitting diode negative pole among the described photoelectrical coupler U02 is connected with monitored voltage source negative pole Vout-by resistance R 34; Transistor collector among the photoelectrical coupler U02 is connected with voltage source two anodal VB+, and emitter is connected with voltage source two negative pole VB-by resistance R 51, and simultaneously, emitter also is connected with single-chip microcomputer as overvoltage signal output part two;
Described under-voltage protection resistance two comprises comparator U14, photoisolator U03, resistance R 35, resistance R 52; Described comparator U14 inverting input is connected with resistance R 22, resistance R 23 public connecting ends, and its normal phase input end is connected with the public connecting end of resistance R 26, resistance R 27, and its output is connected with the light-emitting diode among the photoelectrical coupler U03 is anodal; Light-emitting diode negative pole among the described photoelectrical coupler U03 is connected with monitored voltage source negative pole Vout-by resistance R 35; Transistor collector among the photoelectrical coupler U03 is connected with voltage source two anodal VB+, and emitter is connected with voltage source two negative pole VB-by resistance R 52, and simultaneously, emitter also is connected with single-chip microcomputer as under-voltage signal output part two;
Described current sampling resistor R21 is connected between monitored voltage output terminal negative pole Vout-and the load circuit negative pole Vout-a;
Described current foldback circuit comprises operational amplifier U15, comparator U16, photoelectrical coupler U04, resistance R 42, resistance R 43, resistance R 41, resistance R 37, resistance R 53; Described operational amplifier U15 inverting input is connected with monitored voltage source negative pole by resistance R 42, and the end that resistance R 42 is connected with monitored voltage source negative pole should connect an end of monitored voltage output terminal negative pole near resistance R 21; Normal phase input end is connected with the end that current sampling resistor R21 is connected to load circuit negative pole Vout-a by resistance R 43, operational amplifier U15 output is connected with its inverting input by resistance R 41, and the output of operational amplifier U15 also is connected with the normal phase input end of comparator U16; Described comparator U16 inverting input links to each other with the public connecting end of resistance R 26, resistance R 27, and its output is connected with the light-emitting diode among the photoelectrical coupler U04 is anodal; Light-emitting diode negative pole among the described photoelectrical coupler U04 is connected with monitored voltage output terminal negative pole Vout-by resistance R 37; Transistor collector among the photoelectrical coupler U04 is connected with voltage source two anodal VB+, and emitter is connected with voltage source two negative pole VB-by resistance R 53, and simultaneously, its emitter also is connected with single-chip microcomputer as the over-current signal output.
5. power supply according to claim 4 is monitoring and meticulous protective circuit in real time, it is characterized in that resistance R 22, resistance R 24, resistance R 26 are variable resistor; Three terminal regulator U21 is the three terminal regulator of fixing output 5V; Comparator U13 output is connected with the output of three terminal regulator U21 by pull-up resistor R31; Described comparator U14 output is connected with the output of three terminal regulator U21 by pull-up resistor R32; Comparator U16 output is connected with the output of three terminal regulator U21 by pull-up resistor R36; Described operational amplifier U15 output is connected with the output of three terminal regulator U21 by pull-up resistor R33; Described voltage source two and monitored voltage source, the equal electrical isolation of reference voltage source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205953190U CN201846067U (en) | 2010-11-08 | 2010-11-08 | Circuit for real time monitoring and carefully protecting power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205953190U CN201846067U (en) | 2010-11-08 | 2010-11-08 | Circuit for real time monitoring and carefully protecting power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201846067U true CN201846067U (en) | 2011-05-25 |
Family
ID=44040943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205953190U Expired - Fee Related CN201846067U (en) | 2010-11-08 | 2010-11-08 | Circuit for real time monitoring and carefully protecting power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201846067U (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103019145A (en) * | 2012-12-20 | 2013-04-03 | 四川九洲电器集团有限责任公司 | System capable of monitoring and protecting power supply |
| CN103796402A (en) * | 2013-11-07 | 2014-05-14 | 福建睿能科技股份有限公司 | Over-voltage and under-voltage protection circuit, electronic ballast and over-voltage and under-voltage detection method thereof |
| CN103872653A (en) * | 2014-03-25 | 2014-06-18 | 成都国科海博信息技术股份有限公司 | Protective circuit for switching power supply |
| CN104753032A (en) * | 2013-12-26 | 2015-07-01 | 北京谊安医疗系统股份有限公司 | Anesthesia machine and brushless direct current motor protective device applied thereto |
| CN105098719A (en) * | 2014-05-07 | 2015-11-25 | 神讯电脑(昆山)有限公司 | Error detecting apparatus and method with multiple protections |
| CN105449641A (en) * | 2015-12-04 | 2016-03-30 | 中国船舶重工集团公司第七0九研究所 | Direct current power supply with multi-path fault cut-off type protection function |
| CN105983178A (en) * | 2015-02-02 | 2016-10-05 | 深圳市科曼医疗设备有限公司 | Pace-making generation device |
| CN106443502A (en) * | 2016-12-06 | 2017-02-22 | 江苏理工学院 | High-precision power supply ground floating port current detection and protection circuit |
| CN106451343A (en) * | 2016-08-23 | 2017-02-22 | 成都沃尔法特科技有限公司 | Intelligent protection circuit |
| CN107528295A (en) * | 2017-09-29 | 2017-12-29 | 中国西电电气股份有限公司 | A kind of three-phase protective circuit and method for VSC |
| CN108896931A (en) * | 2018-05-22 | 2018-11-27 | 绵阳市维博电子有限责任公司 | A kind of self-diagnosis system for track signal monitoring probe power working condition |
| CN108988298A (en) * | 2018-08-29 | 2018-12-11 | 广州金升阳科技有限公司 | A kind of overtemperature and overcurrent protection circuit and the Switching Power Supply comprising the circuit |
| CN110554341A (en) * | 2018-05-31 | 2019-12-10 | 广东电网有限责任公司 | ultrahigh frequency partial discharge signal simulation device with overvoltage measurement function |
| CN110554344A (en) * | 2018-05-31 | 2019-12-10 | 广东电网有限责任公司 | ultrahigh frequency partial discharge signal simulation device with overvoltage diagnosis function |
| CN110635457A (en) * | 2019-11-12 | 2019-12-31 | 苏州工业园区天和仪器有限公司 | Novel alternating voltage detection protection circuit and method |
| CN112271695A (en) * | 2020-12-14 | 2021-01-26 | 国网辽宁省电力有限公司盘锦供电公司 | Intelligent safety protection power supply device |
| CN114089226A (en) * | 2022-01-18 | 2022-02-25 | 成都市安比科技有限公司 | Active load detection circuit with anti-static damage and controllable overcurrent protection functions |
| CN115808640A (en) * | 2023-02-09 | 2023-03-17 | 苏州浪潮智能科技有限公司 | Power failure detection circuit, method, system, electronic device, and storage medium |
-
2010
- 2010-11-08 CN CN2010205953190U patent/CN201846067U/en not_active Expired - Fee Related
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103019145A (en) * | 2012-12-20 | 2013-04-03 | 四川九洲电器集团有限责任公司 | System capable of monitoring and protecting power supply |
| CN103796402A (en) * | 2013-11-07 | 2014-05-14 | 福建睿能科技股份有限公司 | Over-voltage and under-voltage protection circuit, electronic ballast and over-voltage and under-voltage detection method thereof |
| CN103796402B (en) * | 2013-11-07 | 2016-02-03 | 福建睿能科技股份有限公司 | Over-and under-voltage protective circuit, electric ballast and over-and under-voltage detection method thereof |
| CN104753032A (en) * | 2013-12-26 | 2015-07-01 | 北京谊安医疗系统股份有限公司 | Anesthesia machine and brushless direct current motor protective device applied thereto |
| CN103872653A (en) * | 2014-03-25 | 2014-06-18 | 成都国科海博信息技术股份有限公司 | Protective circuit for switching power supply |
| CN105098719A (en) * | 2014-05-07 | 2015-11-25 | 神讯电脑(昆山)有限公司 | Error detecting apparatus and method with multiple protections |
| CN105983178A (en) * | 2015-02-02 | 2016-10-05 | 深圳市科曼医疗设备有限公司 | Pace-making generation device |
| CN105449641A (en) * | 2015-12-04 | 2016-03-30 | 中国船舶重工集团公司第七0九研究所 | Direct current power supply with multi-path fault cut-off type protection function |
| CN106451343A (en) * | 2016-08-23 | 2017-02-22 | 成都沃尔法特科技有限公司 | Intelligent protection circuit |
| CN106443502B (en) * | 2016-12-06 | 2019-02-15 | 江苏理工学院 | The current detecting and protection circuit of a kind of high-precision power floating ground port |
| CN106443502A (en) * | 2016-12-06 | 2017-02-22 | 江苏理工学院 | High-precision power supply ground floating port current detection and protection circuit |
| CN107528295A (en) * | 2017-09-29 | 2017-12-29 | 中国西电电气股份有限公司 | A kind of three-phase protective circuit and method for VSC |
| CN108896931A (en) * | 2018-05-22 | 2018-11-27 | 绵阳市维博电子有限责任公司 | A kind of self-diagnosis system for track signal monitoring probe power working condition |
| CN110554341A (en) * | 2018-05-31 | 2019-12-10 | 广东电网有限责任公司 | ultrahigh frequency partial discharge signal simulation device with overvoltage measurement function |
| CN110554344A (en) * | 2018-05-31 | 2019-12-10 | 广东电网有限责任公司 | ultrahigh frequency partial discharge signal simulation device with overvoltage diagnosis function |
| CN108988298A (en) * | 2018-08-29 | 2018-12-11 | 广州金升阳科技有限公司 | A kind of overtemperature and overcurrent protection circuit and the Switching Power Supply comprising the circuit |
| CN110635457A (en) * | 2019-11-12 | 2019-12-31 | 苏州工业园区天和仪器有限公司 | Novel alternating voltage detection protection circuit and method |
| CN110635457B (en) * | 2019-11-12 | 2022-03-29 | 苏州工业园区天和仪器有限公司 | Novel alternating voltage detection protection circuit and method |
| CN112271695A (en) * | 2020-12-14 | 2021-01-26 | 国网辽宁省电力有限公司盘锦供电公司 | Intelligent safety protection power supply device |
| CN114089226A (en) * | 2022-01-18 | 2022-02-25 | 成都市安比科技有限公司 | Active load detection circuit with anti-static damage and controllable overcurrent protection functions |
| CN115808640A (en) * | 2023-02-09 | 2023-03-17 | 苏州浪潮智能科技有限公司 | Power failure detection circuit, method, system, electronic device, and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201846067U (en) | Circuit for real time monitoring and carefully protecting power supply | |
| CN107345979B (en) | Insulator leakage current on-line monitoring system | |
| CN209516652U (en) | The multi-series lithium battery management system for having multifunction protection and accurate electric quantity metering | |
| CN211554195U (en) | Arc light detection device | |
| CN104218532A (en) | Voltage protection circuit for frequency converter direct current (DC) bus | |
| CN112600307A (en) | Power transmission line multi-energy complementary power supply system and power supply method thereof | |
| CN205176222U (en) | On --spot detection device of flexible direct current transmission change of current valve submodule piece | |
| CN110112703A (en) | Protect circuit | |
| US20230378908A1 (en) | Impedance detection method and photovoltaic system | |
| CN111030234B (en) | Novel hardware battery redundancy protection device and working method thereof | |
| CN102005912A (en) | Double overcurrent protection circuit of sine wave inverter | |
| CN107069649A (en) | A kind of electrical load safety operation control system | |
| CN208046212U (en) | A kind of mining high current intrinsic safety electric source | |
| CN103378581A (en) | AFCI comprehensive protecting device | |
| CN108777909A (en) | A kind of automatic safety device for detecting X-ray tube current | |
| CN109449880A (en) | A kind of high-power aerospace modular power source input undervoltage protection circuit | |
| CN110994726B (en) | High-voltage isolation hardware protection circuit for preventing capacitor from being overcharged | |
| CN114285371A (en) | High-reliability intelligent monitoring communication combiner box and method for photovoltaic power generation system | |
| CN207801568U (en) | Power-supply system with warm connection function | |
| CN208607301U (en) | Nuclear power station distribution board detection circuit and nuclear power station distribution board detection system | |
| CN106374573A (en) | Overvoltage protection circuit and power supply circuit | |
| CN201556925U (en) | Intelligent photovoltaic lightningproof header box | |
| CN214255706U (en) | Multi-group control circuit with overvoltage, undervoltage and overcurrent protection functions | |
| CN218958526U (en) | Multifunctional automatic reclosing device | |
| CN209088530U (en) | A kind of power supply refrigeration switch dual-protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110525 Termination date: 20181108 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |