CN206114814U - Short -circuit fault detection circuitry of low internal resistance load - Google Patents
Short -circuit fault detection circuitry of low internal resistance load Download PDFInfo
- Publication number
- CN206114814U CN206114814U CN201620980782.4U CN201620980782U CN206114814U CN 206114814 U CN206114814 U CN 206114814U CN 201620980782 U CN201620980782 U CN 201620980782U CN 206114814 U CN206114814 U CN 206114814U
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- circuit
- comparator
- internal resistance
- low internal
- external
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Abstract
The utility model relates to a failure detector circuit field specifically is a short -circuit fault detection circuitry of low internal resistance load, and its volume that can effectively reduce the circuit is with low costs, mistake start -up etc. Phenomenon can not appear, and it includes external circuit, external power source, other end connection reduction voltage circuit are connected to external circuit one end, external circuit includes outer load and contact switch, first input of step -down circuit connection unsteady comparison basis circuit, switch circuit and comparator, comparison basis circuit connection floats a second input of comparator, switch circuit passes through sampling circuit and connects a third input of comparator, switch circuit still connects and keeps apart the pulse trigger circuit, the output of comparator passes through fault -signal output circuit and connects outer main circuit.
Description
Technical field
This utility model is related to failure detector circuit field, specially a kind of short trouble detection electricity of low internal resistance load
Road.
Background technology
Fire protection alarm system is that, at present in the facility that the place such as building, public place is indispensable, it can detect that fire is sent out
Give birth to and implement to report to the police, the personal safety as well as the property safety of people is effectively ensured, general fire protection alarm system can monitor external loading, work as outside
The circuit of load is short-circuited or needs to send fault-signal during disconnection fault, and existing circuit cannot well realize low internal resistance
The short trouble warning function of load, if line short just occurs without phenomenons such as startups, and typically requires to increase circuit work(
Rate, the volume of device is larger, high cost.It is difficult to realize.
The content of the invention
In order to solve the above problems, this utility model provides a kind of short trouble detection circuit of low internal resistance load, its
The volume of circuit can be effectively reduced, low cost is not in the phenomenons such as error starting.
Its technical scheme is such：A kind of short trouble detection circuit of low internal resistance load, it includes external circuit, institute
External circuit one end connection external power source, other end connection reduction voltage circuit are stated, the external circuit includes that outer load and contact are opened
Close, first input of the reduction voltage circuit connection floating benchmark circuit, on-off circuit and comparator, the floating ratio
Compared with second input that reference circuit connects the comparator, the on-off circuit connects the comparator by sample circuit
The 3rd input, the on-off circuit is also connected with isolating pulsed triggering circuit, and the outfan of the comparator passes through failure
Signal output apparatus connect outer main circuit.
It is further characterized by, and the reduction voltage circuit includes rectifier bridge D3, diode D1 and diode D2；
The on-off circuit includes audion T1；
The isolation pulsed triggering circuit includes photo-coupler U3 and resistance R7；
The fault-signal output circuit includes photo-coupler U1.
After using structure of the present utility model, using pulse-triggered detection mode, the moment overload capacity of device is make use of
Extremely strong the characteristics of, the power of sample circuit is greatly reduced, reduce circuit volume and reduce cost, and take outer load just
Often the half of running voltage is used as detection voltage, using pulse detection mode, it is to avoid misoperation；Employ photo-coupler
Afterwards, anti-interference is substantially increased.
Description of the drawings
Fig. 1 is this utility model theory diagram；
Fig. 2 is this utility model circuit theory diagrams.
Specific embodiment
As shown in Figure 1, a kind of short trouble detection circuit of low internal resistance load, it includes external circuit, the external electrical
Road one end connection external power source, other end connection reduction voltage circuit, the external circuit includes outer load and contact switch, the drop
First input of volt circuit connection floating benchmark circuit, on-off circuit and comparator, the floating benchmark electricity
Road connects second input of the comparator, and the on-off circuit connects the 3rd of the comparator by sample circuit
Input, the on-off circuit is also connected with isolating pulsed triggering circuit, and the outfan of the comparator is exported by fault-signal
Circuit connects outer main circuit.
Specific circuit diagram as shown in Figure 2, wherein, reduction voltage circuit includes rectifier bridge D3, diode D1 and diode D2；Open
Powered-down road includes audion T1；Isolation pulsed triggering circuit includes photo-coupler U3 and resistance R7；Fault-signal output circuit bag
Include photo-coupler U1.
Operation principle is as described below：On-off circuit is by the trigger pulse letter for isolating the timing detection that pulsed triggering circuit is provided
Number control, the electric current Jing reduction voltage circuits of external power source flow into sample circuit and reach outer load during opening, and on sampling resistor R4
Produce voltage, Jing comparator U2 and intrinsic standoff ratio of the floating benchmark circuit on resistance R2 relatively after output signals to main circuit,
The electric current increase when negative outer load short circuit, the voltage on resistance R4 is increased above and compares threshold reference voltage, comparator U2 output electricity
It is flat to export fault-signal.
This utility model also has the characteristics that：
1. Width funtion work, be can in the range of certain voltage normal work, the comparator in circuit employed with outside
The a reference source of voltage floating rather than the voltage regulation way traditionally applied.Reference voltage also can be reduced when so external electrical is forced down,
Then uprise when high, without affecting to detect the error of failure with the change of external voltage due to sampled voltage.
2. power supply is supplied：Working power is provided by blood pressure lowering after external power all wave rectification, i.e., directly using the outer load of series connection
Outer power supply source supply, without the need for independent current source.With outside nonpolarity linkage function, facilitate engineering construction.
Claims (5)
1. a kind of short trouble of low internal resistance load detects circuit, it is characterised in that it includes external circuit, the external circuit
One end connection external power source, other end connection reduction voltage circuit, the external circuit includes outer load and contact switch, the blood pressure lowering
First input of circuit connection floating benchmark circuit, on-off circuit and comparator, the floating benchmark circuit
Connect second input of the comparator, the on-off circuit is defeated by sample circuit connect the comparator the 3rd
Enter end, the on-off circuit is also connected with isolating pulsed triggering circuit, and the outfan of the comparator is by fault-signal output electricity
Road connects outer main circuit.
2. a kind of short trouble of low internal resistance load according to claim 1 detects circuit, it is characterised in that the blood pressure lowering
Circuit includes rectifier bridge D3, diode D1 and diode D2.
3. a kind of short trouble of low internal resistance load according to claim 1 detects circuit, it is characterised in that the switch
Circuit includes audion T1.
4. a kind of short trouble of low internal resistance load according to claim 1 detects circuit, it is characterised in that the isolation
Pulsed triggering circuit includes photo-coupler U3 and resistance R7.
5. a kind of short trouble of low internal resistance load according to claim 1 detects circuit, it is characterised in that the failure
Signal output apparatus include photo-coupler U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620980782.4U CN206114814U (en) | 2016-08-30 | 2016-08-30 | Short -circuit fault detection circuitry of low internal resistance load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620980782.4U CN206114814U (en) | 2016-08-30 | 2016-08-30 | Short -circuit fault detection circuitry of low internal resistance load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206114814U true CN206114814U (en) | 2017-04-19 |
Family
ID=58514537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620980782.4U Active CN206114814U (en) | 2016-08-30 | 2016-08-30 | Short -circuit fault detection circuitry of low internal resistance load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206114814U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353632A (en) * | 2016-08-30 | 2017-01-25 | 无锡蓝天电子股份有限公司 | Short circuit fault detection circuit of low-internal-resistance load |
-
2016
- 2016-08-30 CN CN201620980782.4U patent/CN206114814U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353632A (en) * | 2016-08-30 | 2017-01-25 | 无锡蓝天电子股份有限公司 | Short circuit fault detection circuit of low-internal-resistance load |
| CN106353632B (en) * | 2016-08-30 | 2023-08-18 | 无锡蓝天电子股份有限公司 | Short-circuit fault detection circuit with low internal resistance load |
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