CN207010210U - A kind of fault detect and power protecting circuit - Google Patents
A kind of fault detect and power protecting circuit Download PDFInfo
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- CN207010210U CN207010210U CN201720324116.XU CN201720324116U CN207010210U CN 207010210 U CN207010210 U CN 207010210U CN 201720324116 U CN201720324116 U CN 201720324116U CN 207010210 U CN207010210 U CN 207010210U
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Abstract
The utility model discloses a kind of fault detect and power protecting circuit, including to main control chip provide voltage-stabilized power supply power supply mu balanced circuit, connection power mu balanced circuit fault-signal latch cicuit and output voltage detecting circuit, output current detection circuit and power device temperature sensing circuit；Output voltage detecting circuit, output current detection circuit and power device temperature sensing circuit are used to detect failure and to fault-signal latch cicuit transmission failure signal；Fault-signal latch cicuit is used to control the power supply output of cut-off power supply mu balanced circuit and locked malfunction according to fault-signal.The overheating fault of output voltage, output current and related power device can accurately be judged, fault-signal is latched simultaneously, after failure artificially thoroughly excludes and re-power and can just restart, avoid self- recoverage output to power supply in itself or electrical equipment may caused by secondary injury.
Description
Technical field
Application of electronic technology field is the utility model is related to, more particularly to overvoltage, overcurrent and power component
The detection of the failure of overheat and the circuit of protection power source.
Background technology
Power supply unit of the power supply as all electronic products, except basic electric property will meet the requirement of electrical equipment
Outside, the error protection measure of its own is also extremely important, such as overvoltage, excessively stream, overtemperature protection.Temperature is that influence power-supply device can
By the most important factor of property；In order to avoid power device overheat causes to damage, need to set overheating protection circuit, limit in the supply
Make the highest environment temperature or device body temperature of its work.In general, power supply output over-voltage, overcurrent and member
The too high failure of device temperature, belongs to the hard failure of power source internal, i.e., it is bad performance occur for electronic component, is irreversible
's；So power supply must take safeguard measure, shut-off output, the state of affairs of otherwise leaving further deteriorate, are next certain in time
Appearance is smoldered or the situation of naked light.And output voltage is too high or electric current is excessive, also further electrical equipment can be caused to hinder
Harmful, for example overtension can puncture electronic component, and electric current, which crosses conference, to be made electronic component heating excessive and damage.In addition when electricity
When sub- product breaks down, as when electronic product input side is short-circuit or outlet side is opened a way, power supply also must shut off output, Cai Nengbao
Shield power device and output side apparatus etc. are not burned out, and otherwise may also cause the more serious damage of electronic product, or even cause
The accident such as the electric shock of operating personnel and fire.
The error protections such as conventional arrangement of overvoltage, excessively stream, overheat, all it is automatic recovery type；I.e. after power-off exports,
As energy storage device electric discharge and power device temporarily cease work, voltage reduces, electric current reduces or temperature reduces, Jiu Huichong
It is new to recover output；But as described above, this several failure is all irreversible, so recovery output in itself or can be used power supply again
Electric equipment causes secondary injury.To avoid such case from occurring, it is necessary to a kind of detectable overvoltage, overcurrent and power member device
The failures such as part overheat and the protection circuit for the type protection that is improved to be automatically locked by automatic recovery type protection.
Utility model content
The purpose of this utility model is the above-mentioned deficiency for overcoming prior art, there is provided a kind of fault detect and power supply are protected
Protection circuit, the circuit can accurately detect and judge the overheating fault of output voltage, output current and related power device, together
When fault-signal is latched, re-power and can just restart after failure artificially thoroughly excludes；Improve self-recovery protection electricity
The defects of road, avoid self- recoverage output to power supply in itself or electrical equipment may caused by secondary injury.
To realize object above, the utility model provides following technical scheme：
A kind of fault detect and power protecting circuit, including the power supply mu balanced circuit to main control chip offer voltage-stabilized power supply,
Also include the fault-signal latch cicuit and output voltage detecting circuit, output current detection circuit of connection power supply mu balanced circuit
With power device temperature sensing circuit；The output voltage detecting circuit, output current detection circuit and the inspection of power device temperature
The output end of slowdown monitoring circuit connects the input of the fault-signal latch cicuit；
The output voltage detecting circuit be used to detecting output voltage values more than after preset value to fault-signal latch cicuit
Transmission failure signal；
The output current detection circuit be used to detecting output current value more than after preset value to fault-signal latch cicuit
Transmission failure signal；
The temperature value that the power device temperature sensing circuit is used to detect power device is believed more than after preset value to failure
Number latch cicuit transmission failure signal；
The fault-signal latch cicuit is used to control the power supply output of cut-off power supply mu balanced circuit simultaneously according to fault-signal
Locked malfunction.
Preferably, the filtering netwok of connecting fault signal latch circuit is included, the filtering netwok includes
The output end of output fault-signal, the first input end for connecting output voltage detecting circuit, connect output current detection circuit
The earth terminal of second input, the 3rd input for connecting power device temperature sensing circuit and ground connection.
Preferably, mu balanced circuit of powering includes the input of connection accessory power supply, connects the output end of main control chip and connect
The earth terminal on ground；
The fault-signal latch cicuit include receive fault-signal input, connect accessory power supply input and
The earth terminal of ground connection；
The output voltage detecting circuit includes the sampled voltage input being connected with output voltage and output fault-signal
Output end；
Sample rate current input that the output current detection circuit includes be connected with output current, export fault-signal
The earth terminal of output end, the calibration terminal of input reference voltage and ground connection；
The power device temperature sensing circuit includes temperature sensor, the output end for exporting fault-signal, input reference
The calibration terminal of voltage and the earth terminal of ground connection.
Preferably, output voltage detecting circuit includes voltage-stabiliser tube ZD2, and voltage-regulator diode ZD2 negative pole is defeated for sampled voltage
Enter end, the first input end of voltage-regulator diode ZD2 positive pole connection filtering netwok.
Preferably, power device temperature sensing circuit includes positive feedback operational amplifier U1B, temperature sensor NTC1, electricity
Hinder R6, resistance R10, resistance R11, resistance R12 and electric capacity C7；The temperature sensor NTC1 is used for the temperature for detecting power device
Numerical value；
Positive feedback operational amplifier U1B normal phase input end passes through resistance R10 connection reference voltages, positive feedback operation amplifier
It is grounded after device U1B normal phase input end connection resistance R11, positive feedback operational amplifier U1B inverting input passes through resistance R12
Reference voltage is connected, is grounded after positive feedback operational amplifier U1B inverting input connection temperature sensor NTC1, positive feedback fortune
It is grounded after calculating amplifier U1B inverting input connection electric capacity C7, positive feedback operational amplifier U1B normal phase input end passes through electricity
Hinder R6 connection positive feedback operational amplifiers U1B output end, positive feedback operational amplifier U1B output end connection filter network electricity
Second input on road.
Preferably, output current detection circuit include negative feedback operational amplifier U1A, resistance R7, resistance R8, resistance R9,
Electric capacity C5 and electric capacity C6；
Output current is defeated by the positive that negative feedback operational amplifier U1A is connected after sample rate current output end connection resistance R7
Enter end, negative feedback operational amplifier U1A normal phase input end connects reference voltage, electric capacity after being sequentially connected electric capacity C6 and resistance R9
It is grounded after node connection resistance R8 between C6 and resistance R9, the node connection between electric capacity C6, resistance R9 and resistance R8 is negative anti-
Operational amplifier U1A inverting input is presented, negative feedback operational amplifier U1A inverting input is negative anti-by electric capacity C5 connections
Present operational amplifier U1A output end, negative feedback operational amplifier U1A the first power pins, negative feedback operational amplifier U1A
Output end connection filtering netwok the 3rd input.
Preferably, filtering netwok includes diode D1, diode D2, diode D3, resistance R13 and electric capacity C4；
Electric capacity C4 one end is grounded, and diode D1 negative poles, diode D2 negative poles are connected after electric capacity C4 other end series resistances R13
And diode D3 negative poles, first input end of the diode D1 positive terminals as filtering netwok, diode D2 positive terminal conducts
Second input of filtering netwok, threeth inputs of the diode D3 as filtering netwok, resistance R5 and electric capacity C4
Between node as filtering netwok output end export fault-signal.
Preferably, fault-signal latch cicuit includes photoelectrical coupler OT1, NPN triode Q2, PNP triode Q3, resistance
R1, resistance R2, resistance R3, resistance R4, resistance R5, electric capacity C1 and electric capacity C3；
To receive the input of fault-signal, resistance R5 other ends connection photoelectrical coupler OT1's is luminous for resistance R5 one end
Diode cathode, photoelectrical coupler OT1 light emitting diode negative pole ground connection, the current collection of photoelectrical coupler OT1 phototriode
Pole is by resistance R4 connection accessory power supplys, and the emitter stage of photoelectrical coupler OT1 phototriode after electric capacity C3 by being grounded, light
The emitter stage of electric coupler OT1 phototriode after resistance R3 by being grounded；NPN triode Q2 collector series resistance R1
With connect accessory power supply after electric capacity C1, NPN triode Q2 grounded emitter, NPN triode Q2 base stage connects photosensitive three pole
The emitter stage of pipe and PNP triode Q3 colelctor electrode；PNP triode Q3 emitter stages pass through resistance R2 connection accessory power supplys, PNP tri-
Pole pipe Q3 base stage connection NPN triode Q2 colelctor electrode.
Preferably, power supply mu balanced circuit includes NPN triode Q1, voltage-regulator diode ZD1, electric capacity C2 and storage capacitor CE1；
The colelctor electrode connection accessory power supply of NPN triode Q1, the base series electric capacity C2 of NPN triode Q1 and the pole of voltage stabilizing two
It is grounded after pipe ZD1, the base stage connection NPN triode Q2 colelctor electrode and PNP triode Q3 base stage of NPN triode Q1, NPN tri-
Pole pipe Q1 emitter stage connection storage capacitor CE1 positive pole, storage capacitor CE1 negative pole ground connection, the emitter stage of NPN triode Q1
Output end as connection main control chip.
Compared with prior art, a kind of fault detect provided by the utility model and power protecting circuit, have with following
Beneficial effect：
Fault detect provided by the utility model and power protecting circuit can be such that power supply enters when irreversible failure occurs
Row self-locking, power supply output is closed, solve the problems, such as power supply output hiccup or voluntarily recover output；Avoid simultaneously to power supply in itself
Or electrical equipment causes secondary injury；The occurrence of preventing aircraft bombing, fundamentally improve the safety in utilization of power supply；
Have that cost is low, scheme simple possible simultaneously, cost is cheap, is adapted to used on power-supply device the advantages that, have higher business
Industry is worth.
Brief description of the drawings
It is of the present utility model by reading the detailed description made to non-limiting example made with reference to the following drawings
Other features, objects and advantages will become more apparent upon：
Fig. 1 is the module diagram of the utility model embodiment fault detect and power protecting circuit；
Fig. 2 is the circuit theory schematic diagram of the utility model embodiment fault detect and power protecting circuit.
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the embodiment of the utility model is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model part of the embodiment, rather than whole embodiments.Generally here described in accompanying drawing and
The component of the utility model embodiment shown can be configured to arrange and design with a variety of.Therefore, below to attached
The detailed description of the embodiment of the present utility model provided in figure is not intended to limit claimed the scope of the utility model,
But it is merely representative of selected embodiment of the present utility model.Based on the embodiment in the utility model, ordinary skill people
The every other embodiment that member is obtained under the premise of creative work is not made, belong to the model of the utility model protection
Enclose.
In description of the present utility model, it is also necessary to which explanation, unless otherwise clearly defined and limited, term " are set
Put ", " installation ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected,
Or it is integrally connected；Can be mechanical connection or electrical connection；Can be joined directly together, intermediary can also be passed through
It is indirectly connected, can is the connection of two element internals.For the ordinary skill in the art, can be according to specific feelings
Condition understands concrete meaning of the above-mentioned term in the utility model.In addition, term " first ", " second ", " the 3rd " are only used for retouching
Purpose is stated, and it is not intended that instruction or hint relative importance.
In addition, the technical scheme between each embodiment of the utility model can be combined with each other, but must be with ability
Domain those of ordinary skill can be implemented as basis, will be understood that when the combination appearance of technical scheme is conflicting or can not realize
The combination of this technical scheme is not present, also not within the protection domain of the requires of the utility model.
The utility model is further described with exemplary embodiment below in conjunction with the accompanying drawings, wherein if it is known that technology
Detailed description for showing that feature of the present utility model is unnecessary, then omitted.
Fig. 1 is the module diagram of the utility model embodiment fault detect and power protecting circuit；Including to master control core
Piece provides the power supply mu balanced circuit 10 of voltage-stabilized power supply, the fault-signal latch cicuit 20 of connection power supply mu balanced circuit 10 and output
Voltage detecting circuit 30, output current detection circuit 40 and power device temperature sensing circuit 50；Output voltage detecting circuit 30,
The output end connecting fault signal latch circuit 20 of output current detection circuit 40 and power device temperature sensing circuit 50 it is defeated
Enter end.
Mu balanced circuit of powering includes the ground connection of the input of connection accessory power supply, the output end for connecting main control chip and ground connection
End.
Output voltage detecting circuit 30 be used to detecting output voltage values more than after preset value to fault-signal latch cicuit 20
Transmission failure signal；Output voltage detecting circuit includes the sampled voltage input being connected with output voltage and output fault-signal
Output end.
Output current detection circuit 40 be used to detecting output current value more than after preset value to fault-signal latch cicuit 20
Transmission failure signal；Output current detection circuit includes sample rate current input, the output fault-signal being connected with output current
Output end, the calibration terminal of input reference voltage and the earth terminal of ground connection.
The temperature value that power device temperature sensing circuit 50 is used to detect power device is more than after preset value to fault-signal
The transmission failure signal of latch cicuit 20；Power device temperature sensing circuit includes temperature sensor, exports the output of fault-signal
The earth terminal at end, the calibration terminal of input reference voltage and ground connection.
Fault-signal latch cicuit 20 is used to control the power supply output of cut-off power supply mu balanced circuit 10 simultaneously according to fault-signal
Locked malfunction；Fault-signal latch cicuit include receive fault-signal input, connect accessory power supply input with
And the earth terminal of ground connection.
Referring to Fig. 2, the filter network electricity of fault detect and power protecting circuit also including connecting fault signal latch circuit
Road 60, filtering netwok 60 are used to be filtered the fault-signal of input.Filtering netwok 60 includes output failure letter
Number output end, connect output voltage detecting circuit first input end, connect output current detection circuit the second input,
Connect the 3rd input of power device temperature sensing circuit and the earth terminal of ground connection.
Fig. 2 is the circuit theory schematic diagram of the utility model embodiment fault detect and power protecting circuit.
Output voltage detecting circuit 30 includes voltage-stabiliser tube ZD2, and voltage-regulator diode ZD2 negative pole is sampled voltage input,
The first input end of voltage-regulator diode ZD2 positive pole connection filtering netwok 60, diode D1 positive terminals are filter network electricity
The first input end on road 60.
Voltage-stabiliser tube ZD2 voltage stabilizing value is rated output voltage+10%, when actual output voltage ＞ rated output voltages+
10%, then voltage-stabiliser tube ZD2 breakdown conducting, the pulse voltage (actual output voltage-Vzd2) of remainder is by diode D1, resistance
R13 and electric capacity C4 are filtered into DC voltage.
Referring to Fig. 2, power device temperature sensing circuit 50 include positive feedback operational amplifier U1B, temperature sensor NTC1,
Resistance R6, resistance R10, resistance R11, resistance R12 and electric capacity C7；Temperature sensor NTC1 is used for the temperature number for detecting power device
Value.
Specifically, positive feedback operational amplifier U1B normal phase input end passes through resistance R10 connection reference voltages, positive feedback
It is grounded after operational amplifier U1B normal phase input end connection resistance R11, positive feedback operational amplifier U1B inverting input leads to
Resistance R12 connection reference voltages are crossed, positive feedback operational amplifier U1B inverting input connection temperature sensor NTC1 is followed by
Ground, it is grounded after positive feedback operational amplifier U1B inverting input connection electric capacity C7, positive feedback operational amplifier U1B positive
Input passes through resistance R6 connection positive feedback operational amplifiers U1B output end, positive feedback operational amplifier U1B output end company
The second input of filtering netwok 60 is connect, diode D2 positive terminals are the second input of filtering netwok 60.
Power device temperature sensing circuit 50 uses temperature sensor NTC1 in higher sensitivity by related power device
Temperature data is changed into voltage data.By after resistance R12, electric capacity C7 and temperature sensor NTC1 potential-divider network, obtaining
Voltage is Vref*NTC1/ (NTC1+R12), and accesses operational amplifier U1B inverting input；Temperature sensor NTC1 is negative
PTC device, as temperature raises its resistance decrease, its partial pressure reduces, if Vref*NTC1/ (NTC1+R12) ＜ Vref*
During R11/ (R10+R11), now there is overheating fault in related power device, and U1B- ＜ U1B+, then operational amplifier U1B outputs are high
Level；Otherwise if temperature is normal, Vref*NTC1/ (NTC1+R12) ＞ Vref*R11/ (R10+R11), U1B- ＞ U1B+, then transports
Calculate amplifier U1B output low levels.
Output current detection circuit 40 includes negative feedback operational amplifier U1A, resistance R7, resistance R8, resistance R9, electric capacity C5
And electric capacity C6.
Specifically, output current connects negative feedback operational amplifier U1A after connecting resistance R7 by sample rate current output end
Normal phase input end, negative feedback operational amplifier U1A normal phase input end connects benchmark after being sequentially connected electric capacity C6 and resistance R9
Voltage, the node between electric capacity C6 and resistance R9 are grounded after connecting resistance R8, the node between electric capacity C6, resistance R9 and resistance R8
Negative feedback operational amplifier U1A inverting input is connected, negative feedback operational amplifier U1A inverting input passes through electric capacity C5
Connect negative feedback operational amplifier U1A output end, negative feedback operational amplifier U1A the first power pins, negative-feedback computing
3rd input of amplifier U1A output end connection filtering netwok 60, diode D3 is the of filtering netwok 60
Three inputs.
The voltage signal that sign output current size is seized when output current detection circuit is more than Vref*R8/ (R8+R9)
When, now there is output overcurrent failure, U1A+ ＞ U1A-, then operational amplifier U1A export high level；Conversely, when the electricity seized
Pressure signal is less than Vref*R8/ (R8+R9), i.e. U1A+ ＜ U1A-, then transports operational amplifier U1A output low levels.
Referring to Fig. 2, filtering netwok 60 includes diode D1, diode D2, diode D3, resistance R13 and electric capacity C4.
Specifically, electric capacity C4 one end is grounded, diode D1 negative poles, two poles are connected after electric capacity C4 other end series resistances R13
Pipe D2 negative poles and diode D3 negative poles, first input end of the diode D1 positive terminals as filtering netwok 60, diode D2
Second input of the positive terminal as filtering netwok 60, threeth inputs of the diode D3 as filtering netwok 60,
Node between resistance R5 and electric capacity C4 exports fault-signal as the output end of filtering netwok 60.
Referring to Fig. 2, fault-signal latch cicuit 20 include photoelectrical coupler OT1, NPN triode Q2, PNP triode Q3,
Resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electric capacity C1 and electric capacity C3.
Specifically, resistance R5 one end connects the node between resistance R5 and electric capacity C4 for the input of reception fault-signal,
Resistance R5 other ends connection photoelectrical coupler OT1 light emitting diode positive pole, photoelectrical coupler OT1 light emitting diode negative pole connect
Ground, the colelctor electrode of photoelectrical coupler OT1 phototriode pass through resistance R4 connection accessory power supplys, photoelectrical coupler OT1 light
For the emitter stage of quick triode by being grounded after electric capacity C3, the emitter stage of photoelectrical coupler OT1 phototriode passes through resistance R3
After be grounded；
Accessory power supply, NPN triode Q2 transmitting are connected after NPN triode Q2 collector series resistance R1 and electric capacity C1
Pole is grounded, NPN triode the Q2 emitter stage of base stage connection phototriode and PNP triode Q3 colelctor electrode；PNP triode
Q3 emitter stages pass through resistance R2 connection accessory power supplys, PNP triode Q3 base stage connection NPN triode Q2 colelctor electrode.
NPN triode Q2 and PNP triode Q3 composition analog thyristor circuits.It is described include overvoltage, overcurrent and
Three kinds of malfunctions of the overheat of power device are effective with the voltage high level on electric capacity C4, and three kinds of malfunctions be or
Relation, as long as a certain failure occur, will trigger protection circuit operation.
Power supply mu balanced circuit 10 includes NPN triode Q1, voltage-regulator diode ZD1, electric capacity C2 and storage capacitor CE1.
Specifically, NPN triode Q1 colelctor electrode connection accessory power supply, the base series electric capacity C2 of NPN triode Q1 and
It is grounded after voltage-regulator diode ZD1, the base stage connection NPN triode Q2 colelctor electrode and PNP triode Q3 base of NPN triode Q1
Pole, the emitter stage connection storage capacitor CE1 of NPN triode Q1 positive pole, storage capacitor CE1 negative pole ground connection, NPN triode Q1
Emitter stage as connection main control chip output end.The output voltage of power supply mu balanced circuit 10 is Vzd1 (Q1)-Vbe (Q1),
It is turned on and off by the control of fault-signal latch cicuit 20.
When a certain or various faults occur, i.e. output voltage detecting circuit, output current detection circuit and power
When having one or more output high level in device temperature detection circuit, electric capacity C4 is charged by resistance R5, photoelectric coupling
The voltage of device OT1 light emitting diode turns on after reaching 1.1V, is also switched on after its phototriode light；
Further, accessory power supply VDD makes NPN triode Q2 base-emitter positively biaseds by resistance R4, and NPN triode Q2 is turned on,
The base potential of NPN triode Q1 in mu balanced circuit 10 of powering is grounded, then NPN triode Q1 is ended, accessory power supply VDD
Stop powering to main control chip IC, main control chip IC will be stopped, and so as to close output, realize defencive function.
After NPN triode Q2 conductings, cause that PNP triode Q3 base-emitter is reverse-biased, and then PNP triode Q3 is led
Logical, now NPN triode Q2 base current can be provided by PNP triode Q3 completely；Even if photoelectrical coupler OT1 ends,
I.e. above-mentioned failure occurred has excluded, and the fault-signal latch cicuit 20 is still locked by malfunction, only first disconnects
AC power makes accessory power supply VDD stop input power, and after artificially above-mentioned failure is excluded completely, then incoming transport power supply,
Power supply can just release error protection, recover output again.
The utility model preferred embodiment is these are only, is not used to limit to the utility model, it is all of the present utility model
Modifications, equivalent substitutions and improvements for being done etc. within spirit and principle, be required to be included in the scope of protection of the utility model it
It is interior.
Claims (8)
1. a kind of fault detect and power protecting circuit, including the power supply mu balanced circuit to main control chip offer voltage-stabilized power supply, its
It is characterised by, in addition to the fault-signal latch cicuit of connection power supply mu balanced circuit and output voltage detecting circuit, output electricity
Current detection circuit and power device temperature sensing circuit；The output voltage detecting circuit, output current detection circuit and power
The output end of device temperature detection circuit connects the input of the fault-signal latch cicuit；
The output voltage detecting circuit is used to detect after output voltage values are more than preset value to be transmitted to fault-signal latch cicuit
Fault-signal；
The output current detection circuit is used to detect after output current value is more than preset value to be transmitted to fault-signal latch cicuit
Fault-signal；
The temperature value that the power device temperature sensing circuit is used to detect power device is locked more than after preset value to fault-signal
Deposit circuit transmission fault-signal；
The fault-signal latch cicuit be used for according to fault-signal control cut-off power supply mu balanced circuit power supply output and it is locked
Malfunction；
The fault-signal latch cicuit includes photoelectrical coupler OT1, NPN triode Q2, PNP triode Q3, resistance R1, resistance
R2, resistance R3, resistance R4, resistance R5, electric capacity C1 and electric capacity C3；
To receive the input of fault-signal, the resistance R5 other ends connect photoelectrical coupler OT1 light-emitting diodes for resistance R5 one end
Pipe positive pole, photoelectrical coupler OT1 light emitting diode negative pole ground connection, the colelctor electrode of photoelectrical coupler OT1 phototriode lead to
Resistance R4 connection accessory power supplys are crossed, the emitter stage of photoelectrical coupler OT1 phototriode after electric capacity C3 by being grounded, photoelectricity coupling
The emitter stage of clutch OT1 phototriode after resistance R3 by being grounded；NPN triode Q2 collector series resistance R1 and electricity
Accessory power supply, NPN triode Q2 grounded emitter are connected after holding C1, NPN triode Q2 base stage connects phototriode
The colelctor electrode of emitter stage and PNP triode Q3；PNP triode Q3 emitter stages pass through resistance R2 connection accessory power supplys, PNP triode
Q3 base stage connection NPN triode Q2 colelctor electrode.
2. fault detect according to claim 1 and power protecting circuit, it is characterised in that also including connecting fault signal
The filtering netwok of latch cicuit, the filtering netwok include the output end of output fault-signal, connection output voltage
The first input end for detecting circuit, the second input, the connection power device temperature detection electricity that connect output current detection circuit
3rd input on road and the earth terminal of ground connection.
3. fault detect according to claim 1 or 2 and power protecting circuit, it is characterised in that the power supply voltage stabilizing electricity
Road includes the input of connection accessory power supply, connects the output end of main control chip and the earth terminal of ground connection；
The fault-signal latch cicuit includes receiving the input of fault-signal, the input of connection accessory power supply and ground connection
Earth terminal；
The output voltage detecting circuit includes the sampled voltage input being connected with output voltage and exports the defeated of fault-signal
Go out end；
The output current detection circuit includes the output for the sample rate current input, output fault-signal being connected with output current
The earth terminal at end, the calibration terminal of input reference voltage and ground connection；
The power device temperature sensing circuit includes temperature sensor, the output end for exporting fault-signal, input reference voltage
Calibration terminal and ground connection earth terminal.
4. fault detect according to claim 2 and power protecting circuit, it is characterised in that the output voltage detection electricity
Road includes voltage-stabiliser tube ZD2, and voltage-regulator diode ZD2 negative pole is sampled voltage input, and voltage-regulator diode ZD2 positive pole connection is filtered
The first input end of wave network circuit.
5. fault detect according to claim 2 and power protecting circuit, it is characterised in that the power device temperature inspection
Slowdown monitoring circuit include positive feedback operational amplifier U1B, temperature sensor NTC1, resistance R6, resistance R10, resistance R11, resistance R12 and
Electric capacity C7；The temperature sensor NTC1 is used for the Temperature numerical for detecting power device；
Positive feedback operational amplifier U1B normal phase input end passes through resistance R10 connection reference voltages, positive feedback operational amplifier
It is grounded after U1B normal phase input end connection resistance R11, positive feedback operational amplifier U1B inverting input is connected by resistance R12
Reference voltage is connect, is grounded after positive feedback operational amplifier U1B inverting input connection temperature sensor NTC1, positive feedback computing
It is grounded after amplifier U1B inverting input connection electric capacity C7, positive feedback operational amplifier U1B normal phase input end passes through resistance
R6 connection positive feedback operational amplifiers U1B output end, positive feedback operational amplifier U1B output end connection filtering netwok
The second input.
6. fault detect according to claim 2 and power protecting circuit, it is characterised in that the output electric current measure electricity
Road includes negative feedback operational amplifier U1A, resistance R7, resistance R8, resistance R9, electric capacity C5 and electric capacity C6；
Output current connects the positive input of connection negative feedback operational amplifier U1A after resistance R7 by sample rate current output end
End, negative feedback operational amplifier U1A normal phase input end connect reference voltage, electric capacity C6 after being sequentially connected electric capacity C6 and resistance R9
Node between resistance R9 is grounded after being connected resistance R8, the node connection negative-feedback between electric capacity C6, resistance R9 and resistance R8
Operational amplifier U1A inverting input, negative feedback operational amplifier U1A inverting input pass through electric capacity C5 connection negative-feedbacks
Operational amplifier U1A output end, negative feedback operational amplifier U1A the first power pins, negative feedback operational amplifier U1A's
Output end connects the 3rd input of filtering netwok.
7. fault detect according to claim 2 and power protecting circuit, it is characterised in that the filtering netwok bag
Include diode D1, diode D2, diode D3, resistance R13 and electric capacity C4；
Electric capacity C4 one end is grounded, and diode D1 negative poles, diode D2 negative poles and two are connected after electric capacity C4 other end series resistances R13
Pole pipe D3 negative poles, first input end of the diode D1 positive terminals as filtering netwok, diode D2 positive terminals are as filtering
Second input of lattice network, threeth inputs of the diode D3 as filtering netwok, between resistance R5 and electric capacity C4
Node as filtering netwok output end export fault-signal.
8. fault detect according to claim 1 and power protecting circuit, it is characterised in that the power supply mu balanced circuit bag
Include NPN triode Q1, voltage-regulator diode ZD1, electric capacity C2 and storage capacitor CE1；
The colelctor electrode connection accessory power supply of NPN triode Q1, the base series electric capacity C2 and voltage-regulator diode of NPN triode Q1
It is grounded after ZD1, the base stage connection NPN triode Q2 colelctor electrode and PNP triode Q3 base stage of NPN triode Q1, the poles of NPN tri-
Pipe Q1 emitter stage connection storage capacitor CE1 positive pole, storage capacitor CE1 negative pole ground connection, the emitter stage of NPN triode Q1 are made
To connect the output end of main control chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720324116.XU CN207010210U (en) | 2017-03-30 | 2017-03-30 | A kind of fault detect and power protecting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720324116.XU CN207010210U (en) | 2017-03-30 | 2017-03-30 | A kind of fault detect and power protecting circuit |
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| CN207010210U true CN207010210U (en) | 2018-02-13 |
Family
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| CN201720324116.XU Expired - Fee Related CN207010210U (en) | 2017-03-30 | 2017-03-30 | A kind of fault detect and power protecting circuit |
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| CN (1) | CN207010210U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108357453A (en) * | 2018-03-05 | 2018-08-03 | 浙江吉利汽车研究院有限公司 | A kind of collision detection circuit and system |
| CN108494418A (en) * | 2018-03-09 | 2018-09-04 | 敖日其楞 | A kind of big data signal calibration circuit |
| CN109525206A (en) * | 2018-12-28 | 2019-03-26 | 深圳中创艾宝技术有限公司 | A kind of radio-frequency power amplifier real-time monitoring protection circuit |
| CN112737297A (en) * | 2020-12-15 | 2021-04-30 | 广东新昇电业科技股份有限公司 | Driving power supply and method for improving reliability of driving power supply in abnormal environment |
| CN115356652A (en) * | 2022-08-16 | 2022-11-18 | 西安军陶科技有限公司 | Power failure detection and output control system |
-
2017
- 2017-03-30 CN CN201720324116.XU patent/CN207010210U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108357453A (en) * | 2018-03-05 | 2018-08-03 | 浙江吉利汽车研究院有限公司 | A kind of collision detection circuit and system |
| CN108357453B (en) * | 2018-03-05 | 2020-07-07 | 浙江吉利汽车研究院有限公司 | Collision detection circuit and system |
| CN108494418A (en) * | 2018-03-09 | 2018-09-04 | 敖日其楞 | A kind of big data signal calibration circuit |
| CN108494418B (en) * | 2018-03-09 | 2020-08-28 | 瑞安市虹宇科技有限公司 | Big data signal calibration circuit |
| CN109525206A (en) * | 2018-12-28 | 2019-03-26 | 深圳中创艾宝技术有限公司 | A kind of radio-frequency power amplifier real-time monitoring protection circuit |
| CN109525206B (en) * | 2018-12-28 | 2021-12-28 | 中科特思信息技术(深圳)有限公司 | Real-time monitoring protection circuit of radio frequency power amplifier |
| CN112737297A (en) * | 2020-12-15 | 2021-04-30 | 广东新昇电业科技股份有限公司 | Driving power supply and method for improving reliability of driving power supply in abnormal environment |
| CN115356652A (en) * | 2022-08-16 | 2022-11-18 | 西安军陶科技有限公司 | Power failure detection and output control system |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20180213 Termination date: 20190330 |