CN208257378U - A kind of multiple-channel output low voltage difference overcurrent protector - Google Patents
A kind of multiple-channel output low voltage difference overcurrent protector Download PDFInfo
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- CN208257378U CN208257378U CN201820264898.7U CN201820264898U CN208257378U CN 208257378 U CN208257378 U CN 208257378U CN 201820264898 U CN201820264898 U CN 201820264898U CN 208257378 U CN208257378 U CN 208257378U
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Abstract
The utility model relates to a kind of multiple-channel output low voltage difference overcurrent protectors, including input interface, accessory power supply, failure reset and upper telegraph circuit, failure to report the partial circuits such as interface, differential current sampling circuit, electronic switch, error amplifier, pressure difference comparator, output interface.The utility model is using P-channel power MOS pipe as electronic switch；Constant current when error amplification control power MOS pipe opens degree: greater than rated current benchmark is carried out to error amplifier is sent together after Small Current Signal amplification with current reference using difference amplifier using after the small signal of low voltage difference current divider sample rate current, is less than completely open-minded when rated current benchmark；Power MOS pipe pressure difference is carried out using pressure difference comparator and voltage reference is compared and determines whether failure.
Description
Technical field
The utility model belongs to overcurrent protective device, and in particular to a kind of multiple-channel output low voltage difference overcurrent protector.
Background technique
The existing multiple-channel output protection scheme of input all the way is that public input all the way is followed by multichannel fuse realization multichannel guarantor
Protective function.As shown in Figure 1, the disadvantage is that: the blown fuse time is long, blowout current is big, poor with variation of ambient temperature striking point
It is different big, a certain to pass by stream or short circuit may cause other roads without output (if this road output-current rating is larger close to specified input
Electric current, at this time short circuit then will lead to other roads also without output).
Utility model content
It independently exports to solve the problems, such as to input multichannel all the way and is independent of each other, it is defeated that the utility model provides a kind of multichannel
Low voltage difference overcurrent protector solves the above problems out.
The technical scheme adopted by the utility model to solve the technical problem is as follows: a kind of multiple-channel output low voltage difference overcurrent protection
Device, including input interface, failure reset and upper telegraph circuit, with failure reset and the failure of circuit connection is reported to report interface, simultaneously
The multichannel low voltage difference overcurrent protection module of connection and for in each road low voltage difference overcurrent protection module each section circuit power supply
Accessory power supply, every road low voltage difference overcurrent protection module includes differential current sampling circuit, electronic switch, error amplifier, pressure
Poor comparator and output interface, the positive of the input interface are equipped with sampling resistor, institute between the anode of the output interface
State sampling resistor both ends and differential current sampling circuit current input terminal connect, the differential current sampling circuit it is defeated
Outlet is connect with the negative input end of the error amplifier, and the positive input terminal of the error amplifier is connected to the letter of current reference
Number, the output end of the error amplifier is connected with the input terminal of electronic switch.
The electronic switch is power MOS pipe, and the differential current sampling circuit obtains amplified current sample
What signal gave that error amplifier and current reference carry out error amplification control power MOS pipe opens degree, the electric current base
Standard includes output-current rating benchmark and short circuit current benchmark.It is then complete when current sampling signal is less than output-current rating benchmark
Standard-sized sheet leads to power MOS pipe, and then passing through when current sampling signal is greater than output-current rating benchmark reduces the open-minded of power MOS pipe
Degree reaches realization constant current output.
The low voltage difference overcurrent protection module further includes having pressure difference comparator, is parallel with electricity on the power MOS pipe
Resistance and zener diode, the pressure difference comparator are sampled by the resistance and zener diode being connected in parallel on power MOS pipe
The pressure drop of power MOS pipe and voltage reference are compared control power MOS pipe switch.The pressure drop of power MOS pipe is more than or equal to electricity
Pressure benchmark then determines that failover output-current rating benchmark protects power MOS pipe for short circuit current benchmark in time while sending out event
Hinder signal, the pressure drop of power MOS pipe is less than voltage reference and then maintains output-current rating benchmark constant current state.
The failure reset circuit includes that can generate the timer that the period is the extremely narrow pulse of 10 seconds pulsewidths to be used to mention
Each road error amplifier current benchmark switching circuit is supplied, to restore fully loaded output and capacitive load after the output debugging of each road
Offer condition is provided.
The high-frequency ceramic capacitor and low frequency alminium electrolytic condenser for reducing output noise are equipped at the output interface.
The accessory power supply is miniature small-power DC-DC isolated power supply module.
A kind of the advantages of multiple-channel output low voltage difference overcurrent protector of the utility model, is:
(1) (when 12V/10A, pressure difference is less than 1%) for ultra low differential pressure between input and output；
(2) each road output is not interfere with each other independently of each other, and arbitrarily passing by load or short circuit does not influence the output of other roads；
(3) each road over-current protection point can be respectively set, and adaptability is wider；
(4) highly reliable, low drifting, high-precision；
(5) there is overload protection function, there is short-circuit protection function, there is failure to remove auto restore facility；
(6) loaded self-adaptive, can connect resistive, capacitive and inductive load, and adaptability is wider；
(7) failure can report interface to report by failure.
Detailed description of the invention
Utility model will be further described in detail below with reference to the attached drawings and specific embodiments.
Fig. 1 is existing multiple-channel output protection scheme block diagram,
Fig. 2 is the entire block diagram of the utility model,
Fig. 3 is the principles of the present invention block diagram,
Fig. 4 is the principles of the present invention circuit diagram,
Fig. 5 be 10 in Fig. 4 at low voltage difference overcurrent protection module I partial enlarged view,
Fig. 6 is the failure reset of the utility model and upper telegraph circuit and failure report the circuit enlarged drawing of interface.
Note: 1, input interface, 2, accessory power supply, 3, failure reset and upper telegraph circuit, 4, failure report interface, 5, differential electrical
Flow sample circuit, 6, electronic switch, 7, error amplifier, 8, pressure difference comparator, 9, output interface, 10, low voltage difference overcurrent protection
Module I, 11, low voltage difference overcurrent protection module N, R38, resistance, Q7, P-channel metal-oxide-semiconductor, D7, zener diode.
Specific embodiment
The utility model is described in further detail presently in connection with attached drawing.These attached drawings are simplified schematic diagram,
Only illustrate the basic structure of the utility model in a schematic way, therefore it only shows composition related with the utility model.
As shown in figures 2-6, a kind of multiple-channel output low voltage difference overcurrent protector of the utility model, including input interface 1, failure
It resets and upper telegraph circuit 3, failure reports interface 4, multichannel low voltage difference overcurrent protection module in parallel and for being each road low pressure
The accessory power supply 2 of each section circuit power supply in poor overcurrent protection module.
Input interface 1: from public direct-current power supply to this protective device because longer input line can introduce some interference, therefore
It is equipped with high-frequency ceramic capacitor and the filtering of low frequency alminium electrolytic condenser at input interface 1 to filter out such interference, reduces input noise.
Accessory power supply 2: each road protection circuit power supply is given using miniature small-power DC-DC isolated power supply module.Its advantage is that
Input power range ultra-wide (input range for reaching 4:1), output voltage stabilization, input and output voltage are completely isolated.This protection
Device, to each road protection circuit power supply, has been saved cost and has been constantly shrinking only with one group of accessory power supply.
Failure reset and upper telegraph circuit 3: failure reset circuit is about that 10 seconds pulsewidths are extremely narrow using the timer generation period
Pulse is supplied to each road error amplifier current benchmark switching circuit, for restore after the output debugging of each road fully loaded output and
Capacitive load exports offer condition.As long as telegraph circuit summarizes the i.e. any event all the way of each road fault-signal using "or" logic in failure
Barrier is immediately passed to failure and reports interface 4.
Failure reports interface 4: failure report interface 4 to summarize using isolation optocoupler transmitting after fault-signal, when failure produces
Raw failure high level signal lights isolation optocoupler internal primary light emitting diode, and secondary phototriode receives failure light letter
External fault Acquisition Circuit is given in output after number, because isolation optocoupler has the compatible all kinds of fault collection electricity of isolation, the characteristic to suspend
Road.
Differential current sampling circuit 5: in order to reduce the pressure drop loss of current foldback circuit and reduce temperature change to protection
The influence of circuit, it is only ± 50ppm/ DEG C of 5 milliohm ultra low temperature coefficients that differential current sampling circuit 5, which uses temperature-coefficient of electrical resistance,
Manganin current divider is sampled after 50 millivolts of small-signals when exporting electric current 10A after 20 times of difference amplifier amplifications
Give error amplifying circuit.When exporting electric current 10A, current divider pressure drop is only 50 millivolts！Power consumption is only 0.5W！
Electronic switch 6: this protective device uses P-channel power MOS pipe as electronic switch 6, its advantage is that conducting resistance
It is small；Power capacity is big；Control simply can multi-way shared accessory power supply.The maximum continuous electricity of the power MOS pipe that this protective device uses
Flow ID=120A, conducting resistance RDS(on)=3.5m Ω, maximum power PD=136W.The electronic switch pressure drop when exporting electric current 10A
Only 35 millivolts！Power consumption is only 0.35W！
Error amplifier 7: our department's parallel circuit is containing current reference circuit and the pi regulator being made of integrated transporting discharging, and amplifier is just
Input termination current reference, negative input terminate amplified current sampling signal, current sampling signal and current reference signal ratio
Degree is opened compared with power MOS pipe is controlled after amplification, makes constant output current.When current sampling signal is less than current reference, accidentally
Poor amplifier 7 is only used as comparator, and control power MOS pipe is completely open-minded.Work as load down, current sampling signal is greater than electricity
Error amplifier acts to form negative-feedback when flowing benchmark, and reduction power MOS pipe, which opens degree, makes constant output current, at this time electric current
Sampled signal follow current benchmark.There are two this circuital current benchmark: one is output-current rating benchmark, the other is short-circuit
Current reference.Rated current benchmark is set as 1V in the design, and it is 25mV that short circuit current, which is set as 0.25A i.e. short circuit current benchmark,.
Pressure difference comparator 8: pass through the resistance R38 and zener diode D6 sampled power metal-oxide-semiconductor being connected in parallel on power MOS pipe
On voltage drop.The effect of zener diode D6 is that limitation pressure difference samples maximum value protection operational amplifier circuit when a short circuit occurs.It adopts
It is sent after sample to pressure difference signal to the follower being made of amplifier, follower output is sent to pressure difference comparator 8.The effect of follower is
It realizes impedance matching, cuts off the association between pressure difference comparison circuit and Ge Lu output.Pressure difference signal and pressure difference benchmark are compared,
When power MOS pipe pressure drop is greater than the set value, pressure difference comparison circuit is determined as failure, switching rated current benchmark to short circuit current
Benchmark, the movement reduction power MOS pipe of error amplifier 7 are opened degree pressure drop and are further increased, form positive feedback and rapidly enter event
Hinder protected mode.Fault-signal is transmitted to failure reset and upper telegraph circuit 3 simultaneously.
Output interface 9: being equipped with high-frequency ceramic capacitor at output interface 9 and low frequency alminium electrolytic condenser filters, and reduces output and makes an uproar
Sound.
Every road low voltage difference overcurrent protection module includes differential current sampling circuit 5, electronic switch 6, error amplifier 7, pressure
The partial circuits such as poor comparator 8, output interface 9.Every road low voltage difference overcurrent protection module principle is identical, with wherein low voltage difference all the way
For overcurrent protection module I, such as Fig. 5, including output interface 9, it is connected on the anode of the anode and output interface 9 of input interface 1
Between sampling resistor RS1, differential current sampling circuit 5, error amplifier 7, pressure difference comparator 8 and electronic switch 6, electronic cutting
Closing 7 is P-channel metal-oxide-semiconductor Q7, and the source electrode of P-channel metal-oxide-semiconductor Q7 is connected with the anode of input interface 1, and sampling resistor RS1 is located at P ditch
Between the source electrode of road metal-oxide-semiconductor and the anode of input interface 1, the drain electrode of P-channel metal-oxide-semiconductor Q7 is connected with the anode of output interface 9,
The both ends of sampling resistor RS1 are connect with the input terminal of differential current sampling circuit 5, and current sampling signal is put by difference amplifier
It being exported by current divider to the negative input end of error amplifier after big, the positive input of error amplifier terminates current reference signal,
The output end of error amplifier is connected with P-channel metal-oxide-semiconductor grid, and current sampling signal and current reference signal are controlled after comparing amplification
P-channel metal-oxide-semiconductor Q7's processed opens degree, makes constant output current.Resistance R38 by being connected in parallel on P-channel metal-oxide-semiconductor Q7 at this time
With the voltage drop of zener diode D6 sampling P-channel metal-oxide-semiconductor, send after sampling pressure difference signal to the follower being made of amplifier,
Follower output is sent to pressure difference comparator 8, and pressure difference comparator 8 carries out pressure difference and controls P-channel metal-oxide-semiconductor Q7's compared with reference voltage
Switch.At 11 in another way low voltage difference overcurrent protection module N such as Fig. 4, the same Fig. 5 of principle is not being repeated herein.
Prototype technique index:
Input voltage range: DC12V ± 25%
Output current scope: 1~10A；
Load regulation :≤1%；
Temperature drift: ± 50ppm/ DEG C；
Operating ambient temperature: -40 DEG C~+55 DEG C；
Storage condition temperature: -50 DEG C~+70 DEG C；
Failure reports: optocoupler secondary triode (optocoupler is connected when failure).
It should be appreciated that specific embodiment described above is only used for explaining the utility model, it is not used to limit this reality
With novel.By the utility model the obvious changes or variations extended out of spirit still in the utility model protection
Among range.
Claims (6)
1. a kind of multiple-channel output low voltage difference overcurrent protector, including input interface, failure reset and upper telegraph circuit and failure reset
And the failure of circuit connection is reported to report interface, multichannel low voltage difference overcurrent protection module in parallel and for being each road low voltage difference
The accessory power supply of each section circuit power supply in overcurrent protection module, it is characterised in that: every road low voltage difference overcurrent protection module packet
Include differential current sampling circuit, electronic switch, error amplifier and output interface, anode and the output of the input interface
Sampling resistor is equipped between the anode of interface, the both ends of the sampling resistor and the current input terminal of differential current sampling circuit connect
It connects, the output end of the differential current sampling circuit is connect with the negative input end of the error amplifier, the error amplification
The positive input terminal of device is connected to the signal of current reference, and the output end of the error amplifier is connected with the input terminal of electronic switch.
2. a kind of multiple-channel output low voltage difference overcurrent protector as described in claim 1, it is characterised in that: the electronic switch
For power MOS pipe, the differential current sampling circuit obtains amplified current sampling signal and gives error amplifier and electricity
Stream benchmark progress error amplification control power MOS pipe opens degree, and the current reference includes output-current rating benchmark
With short circuit current benchmark.
3. a kind of multiple-channel output low voltage difference overcurrent protector as claimed in claim 2, it is characterised in that: the low voltage difference mistake
Flowing protective module further includes having pressure difference comparator, and resistance and zener diode, the pressure are parallel on the power MOS pipe
Poor comparator samples pressure drop and the voltage base of power MOS pipe by the resistance and zener diode that are connected in parallel on power MOS pipe
Standard is compared the switch of control power MOS pipe.
4. a kind of multiple-channel output low voltage difference overcurrent protector as described in claim 1, it is characterised in that: the failure reset
Circuit includes that can generate the timer that the period is the extremely narrow pulse of 10 seconds pulsewidths to be used to be supplied to each road error amplifier current
Benchmark switching circuit provides condition for the fully loaded output of recovery after the output debugging of each road and capacitive load output.
5. a kind of multiple-channel output low voltage difference overcurrent protector as described in claim 1, it is characterised in that: the output interface
The high-frequency ceramic capacitor and low frequency alminium electrolytic condenser that place is equipped with for reducing output noise.
6. a kind of multiple-channel output low voltage difference overcurrent protector as described in claim 1, it is characterised in that: the accessory power supply
For miniature small-power DC-DC isolated power supply module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820264898.7U CN208257378U (en) | 2018-02-23 | 2018-02-23 | A kind of multiple-channel output low voltage difference overcurrent protector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820264898.7U CN208257378U (en) | 2018-02-23 | 2018-02-23 | A kind of multiple-channel output low voltage difference overcurrent protector |
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| CN208257378U true CN208257378U (en) | 2018-12-18 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108376967A (en) * | 2018-02-23 | 2018-08-07 | 扬州海通电子科技有限公司 | A kind of multiple-channel output low voltage difference overcurrent protector |
| CN110932392A (en) * | 2019-11-13 | 2020-03-27 | 贵州天义电器有限责任公司 | Intelligent control system and control method for contactor |
| CN112114209A (en) * | 2020-07-23 | 2020-12-22 | 国网浙江省电力有限公司台州供电公司 | Wiring expansion device and method of relay protection testing instrument |
-
2018
- 2018-02-23 CN CN201820264898.7U patent/CN208257378U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108376967A (en) * | 2018-02-23 | 2018-08-07 | 扬州海通电子科技有限公司 | A kind of multiple-channel output low voltage difference overcurrent protector |
| CN110932392A (en) * | 2019-11-13 | 2020-03-27 | 贵州天义电器有限责任公司 | Intelligent control system and control method for contactor |
| CN110932392B (en) * | 2019-11-13 | 2023-06-16 | 贵州天义电器有限责任公司 | Intelligent control system and control method for contactor |
| CN112114209A (en) * | 2020-07-23 | 2020-12-22 | 国网浙江省电力有限公司台州供电公司 | Wiring expansion device and method of relay protection testing instrument |
| CN112114209B (en) * | 2020-07-23 | 2023-12-05 | 国网浙江省电力有限公司台州供电公司 | Wiring expansion device and method of relay protection test instrument |
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