CN207977724U - A kind of fire-fighting two lines bus short-circuit protection circuit of hand-held encoder - Google Patents
A kind of fire-fighting two lines bus short-circuit protection circuit of hand-held encoder Download PDFInfo
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- CN207977724U CN207977724U CN201820339617.XU CN201820339617U CN207977724U CN 207977724 U CN207977724 U CN 207977724U CN 201820339617 U CN201820339617 U CN 201820339617U CN 207977724 U CN207977724 U CN 207977724U
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- lines bus
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Abstract
The utility model is related to a kind of fire-fighting two lines bus short-circuit protection circuits of hand-held encoder, including：Signal acquisition circuit of the fire-fighting two lines bus host circuit for acquiring and handling fire-fighting two lines bus short-circuit signal can be connected；Reference voltage circuit for providing reference voltage；It is connect respectively with the output end of the output end of signal acquisition circuit, reference voltage circuit, for compare that treated fire-fighting two lines bus short-circuit signal and reference voltage, and exports the voltage comparator circuit of corresponding control signal；It is connect respectively with the output end of voltage comparator circuit, the power supply of hand-held encoder and fire-fighting two lines bus host circuit, for receiving control signal to be connected to or disconnect the power switch circuit of the power supply and fire-fighting two lines bus host circuit of hand-held encoder.Implementing the utility model can be reduced because fire-fighting two lines bus short circuit causes hand-held encoder power consumption fast, or even burns；Mitigate battery because the power consumption that fire-fighting two lines bus short circuit band comes, improves the service life of battery, improve the efficiency of construction.
Description
Technical field
The utility model is related to the electrical fire monitoring fields of low-voltage power supply system, hand-held more specifically to one kind
The fire-fighting two lines bus short-circuit protection circuit of encoder.
Background technology
It often to modify, generally use traditional to the address parameter of electrical fire-detector at the construction field (site) at present
Hand-held encoder is modified, and due to construction site environment complexity, often will appear fire-fighting two lines bus short circuit so that battery is very
It is depleted soon, or even burns hand-held encoder, influence construction speed.
Utility model content
The technical problem to be solved by the present invention is to for the drawbacks described above of the prior art, provide a kind of hand-held volume
The fire-fighting two lines bus short-circuit protection circuit of code device.
Technical solution adopted by the utility model to solve its technical problems is：Construct a kind of fire-fighting two of hand-held encoder
Bus short circuit protects circuit, including：Fire-fighting two lines bus host circuit can be connected for acquiring and handling fire-fighting two lines bus short circuit letter
Number signal acquisition circuit；
Reference voltage circuit for providing reference voltage；
It is connect respectively with the output end of the output end of the signal acquisition circuit, the reference voltage circuit, for comparing
Treated the fire-fighting two lines bus short-circuit signal and the reference voltage, and the voltage for exporting corresponding control signal is more electric
Road；
Respectively with the output end of the voltage comparator circuit, the power supply of the hand-held encoder and the fire-fighting two lines bus master
Electromechanical road connection, it is total with the power supply and the fire-fighting two that are connected to or disconnect the hand-held encoder for receiving the control signal
The power switch circuit of line host circuit.
Preferably, the signal acquisition circuit includes disappearing described in one end connection of resistance R7 and capacitance C1, the resistance R7
The other end of the short-circuit detecting point of anti-two lines bus host circuit, the resistance R7 is grounded by the capacitance C1.
Preferably, the voltage comparator circuit includes：Voltage comparator U1, resistance R5, capacitance C3, capacitance C2, wherein
The inverting input of the voltage comparator U1 connects the output end of the voltage reference circuit, and the voltage compares
The in-phase input end of device U1 connects the output end of the signal acquisition circuit；One end of the resistance R5 connects the voltage and compares
The other end of the output end of device U1, the resistance R5 is grounded by the capacitance C3；One end of the capacitance C2 and the voltage
The feeder ear of comparator U1 connects, the other end ground connection of the capacitance C2.
Preferably, the voltage comparator U1 is the voltage comparator of high input voltage.
Preferably, the reference voltage circuit includes：One end of resistance R4 and resistance R6, the resistance R4 connection first is straight
The other end in galvanic electricity source, the resistance R4 is grounded by the resistance R6, the connecting node and institute of the resistance R4 and resistance R6
State the input terminal connection of voltage comparator circuit.
Preferably, first DC power supply is 3.3V DC power supplies.
Preferably, the power switch circuit includes：Resistance R1, triode Q3, resistance R3, triode Q2, resistance R2, field
Effect pipe Q1, wherein
The collector of the triode Q3 is connect by the resistance R1 with the second DC power supply, the base of the triode Q3
Pole connects the output end of the voltage comparator circuit, and the collector of the triode Q3 passes through the resistance R3 and the triode
The base stage of Q2 is connected；The collector of the triode Q2 connects the grid of the field-effect tube Q1, the collection of the triode Q2
Electrode is connect by the resistance R2 with the power supply of the hand-held encoder；The source electrode connection of the field-effect tube Q1 is described hand-held
The drain electrode of the power supply of encoder, the field-effect tube Q1 connects the fire-fighting two lines bus host circuit, the triode Q3 and three
The emitter of pole pipe Q2 is grounded respectively.
Preferably, the field-effect tube Q1 is enhanced P-channel field-effect transistor (PEFT) pipe.
Preferably, the triode Q2 and triode Q3 manages for NPN.
Preferably, second DC power supply is 3.3V DC power supplies.
Implement a kind of fire-fighting two lines bus short-circuit protection circuit of hand-held encoder of the utility model, has below beneficial to effect
Fruit：It reduces because fire-fighting two lines bus short circuit causes hand-held encoder power consumption fast, or even burns；Mitigate battery because of fire-fighting two lines bus
The power consumption that short circuit band comes, improves the service life of battery, improves the efficiency of construction.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is a kind of structure of an embodiment of the fire-fighting two lines bus short-circuit protection circuit of hand-held encoder of the utility model
Schematic diagram；
Fig. 2 is a kind of circuit of an embodiment of the fire-fighting two lines bus short-circuit protection circuit of hand-held encoder of the utility model
Schematic diagram.
Specific implementation mode
For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing is detailed
Illustrate specific embodiment of the present utility model.
As shown in Figure 1, one in a kind of fire-fighting two lines bus short-circuit protection circuit of hand-held encoder of the utility model is real
It applies in example, a kind of fire-fighting two lines bus short-circuit protection circuit of hand-held encoder of the utility model includes：It is total that fire-fighting two can be connected
Line host circuit is used to acquire and handle the signal acquisition circuit 100 of fire-fighting two lines bus short-circuit signal；For providing reference voltage
Reference voltage circuit 300；It is connect respectively with the output end of the output end of signal acquisition circuit 100, reference voltage circuit 300,
For compare that treated fire-fighting two lines bus short-circuit signal and reference voltage, and the voltage for exporting corresponding control signal is more electric
Road 200；It is connect respectively with the output end of voltage comparator circuit 200, the power supply of hand-held encoder and fire-fighting two lines bus host circuit,
For receiving control signal to be connected to or disconnect the power supply of hand-held encoder and the power switch electricity of fire-fighting two lines bus host circuit
Road 400.
Specifically, signal acquisition circuit 100 connects the short-circuit detecting of the fire-fighting two lines bus in fire-fighting two lines bus host circuit
Point acquires the short-circuit signal of fire-fighting two lines bus, it is to be understood that short-circuit detection signal, that is, fire-fighting two of short-circuit detecting point output
The short-circuit signal of bus, and the short-circuit signal is handled, treated, and short-circuit signal is provided with reference voltage circuit 300
Reference voltage is admitted to the input terminal of voltage comparator circuit 200 together, and voltage comparator circuit 200 inputs above-mentioned two-way and carries out
Compare, being turned on or off for control signal control power supply switching circuit 400 is exported according to comparison result, to control hand-held encoder
Fire-fighting two lines bus host circuit and hand-held encoder power supply (here it can be appreciated that battery of hand-held encoder) it
Between be turned on or off.It after finding short circuit, is shut off and powers to fire-fighting two lines bus host circuit, realize short-circuit protection.It is extensive
It powers again to fire-fighting two lines bus host circuit after multiple, the final protection for realizing the fire-fighting two lines bus to holding encoder.Such as it examines
When measuring the short-circuit signal judgement fire-fighting two lines bus short circuit of fire-fighting two lines bus, then the control of power switch circuit 400 holds encoder
Power supply and fire-fighting two lines bus host circuit disconnection, to avoid short circuit high current accelerate hold encoder power supply, that is, battery
Consumption also can avoid high current and enter fire-fighting two lines bus host circuit to damage fire-fighting two lines bus.
Further, in embodiment as shown in Figure 2, signal acquisition circuit 100 includes resistance R7 and capacitance C1, resistance R7
One end connection fire-fighting two lines bus host circuit short-circuit detecting point, the other end of resistance R7 is grounded by capacitance C1.
Specifically, the voltage value at the both ends capacitance C1 is fixed value under normal circumstances, and when short circuit occurs for fire-fighting two lines bus, electricity
Holding the voltage at the both ends C1 can convert, and after changed control source to 200 input terminal of voltage comparator circuit, voltage compares
Circuit 200 compares the voltage and reference voltage of variation, and short circuit occurs for judgement fire-fighting two lines bus, exports corresponding control signal to electricity
Source switching circuit 400 controls the disconnection of power supply and fire-fighting two lines bus host circuit.
Further, voltage comparator circuit 200 includes：Voltage comparator U1, resistance R5, capacitance C3, capacitance C2, wherein
The output end of the inverting input connection voltage reference circuit of voltage comparator U1, voltage comparator U1's is same mutually defeated
Enter to hold the output end of connection signal Acquisition Circuit 100；The output end of one end connection voltage comparator U1 of resistance R5, resistance R5's
The other end is grounded by capacitance C3；One end of capacitance C2 is connect with the feeder ear of voltage comparator U1, another termination of capacitance C2
Ground.
Specifically, the output end of voltage comparator U1 anti-phase inputs termination reference voltage circuit 300, voltage comparator U2's
Homophase input terminates the output end of signal acquisition circuit 100, and voltage comparator circuit 200 is to reference voltage signal and signal acquisition electricity
The signal on road 100 is compared, and the output end of voltage comparator U1 exports corresponding low and high level signal.Such as when voltage compares
The homophase input terminal voltage (i.e. the output voltage of signal acquisition circuit 100) of device U1 is more than the inverting input of voltage comparator U1
When (output voltage of reference voltage circuit 300), voltage comparator U1 output ends export high level, on the contrary then export low level.
When voltage comparator U1 output high level can be arranged, short circuit occurs for judgement fire-fighting two lines bus.
Further, voltage comparator U1 is the voltage comparator of high input voltage.Specifically, common voltage comparator
Typically 5-15V, when using the voltage comparator of high input voltage, maximum operating voltage 3.3-36V thus can be with
Voltage comparator U1 power supplies directly or after simple process are given simultaneously using the 34V supply voltages of fire-fighting two lines bus host circuit,
So that the structure of voltage comparator circuit 200 is more succinct.
Further, reference voltage circuit 300 includes：One end of resistance R4 and resistance R6, resistance R4 connect the first direct current
The other end of power supply, resistance R4 is grounded by resistance R6, connecting node and the voltage comparator circuit 200 of resistance R4 and resistance R6
Input terminal connects.First DC power supply is 3.3V DC power supplies.
Specifically, one end of resistance R4 connects 3.3V power supplys, the other end connection resistance R6 and voltage of resistance R4 compare
The reverse input end of device, the other end ground connection of resistance R6.
Further, power switch circuit 400 includes：Resistance R1, triode Q3, resistance R3, triode Q2, resistance R2,
Field-effect tube Q1, wherein
The collector of triode Q3 is connect by resistance R1 with the second DC power supply, and the base stage of triode Q3 connects voltage ratio
Compared with the output end of circuit 200, the collector of triode Q3 is connected by resistance R3 with the base stage of triode Q2；Triode Q2's
Collector connects the grid of field-effect tube Q1；Power supply, that is, Fig. 2 that the collector of triode Q2 passes through resistance R2 and hand-held encoder
In power vd D connections, field-effect tube Q1 source electrode connection hold encoder power supply, that is, Fig. 2 in power vd D, field-effect tube
The emitter of the drain electrode connection fire-fighting two lines bus host circuit of Q1, triode Q3 and triode Q2 are grounded respectively.Second direct current
Source is 3.3V DC power supplies.
Specifically, the output end of voltage comparator circuit 200 is connect with the base stage of triode Q3, the emitter of triode Q3 connects
Ground, the collector of triode Q3 connect the one end for connecting resistance R3 simultaneously, another termination of resistance R1 with one end of resistance R1
The other end of 3.3V power supplys, resistance R3 is connect with the base stage of triode Q2, and the emitter ground connection of triode Q2 constitutes two-stage amplification
The collector of circuit, triode Q2 is connect with one end of the grid of field-effect tube Q1 and resistance R2, the other end of resistance R2 and field
The source electrode of effect pipe Q1 is connected with the power vd D in power supply, that is, Fig. 2 of hand-held encoder, drain electrode and the fire-fighting two of field-effect tube Q1
Bus host circuit connects, and entire circuit control holds the connection or disconnected of the power supply and fire-fighting two lines bus host circuit of encoder
It opens.It is appreciated that 3.3V DC power supplies can be to share power supply with 3.3V DC power supplies above here, can also be respectively set.
Further, field-effect tube Q1 is enhanced P-channel field-effect transistor (PEFT) pipe.It is appreciated that can select other suitable here
Transistor.
Further, triode Q2 and triode Q3 manages for NPN.It is appreciated that the crystalline substance that other can be selected applicable here
Body pipe.
It should be understood that above example only expresses preferred embodiments of the present invention, description is more specific
With it is detailed, but it should not be understood as limiting the scope of the patent of the utility model；It should be pointed out that for this field
Those of ordinary skill for, without departing from the concept of the premise utility, can to above-mentioned technical characterstic carry out freely
Combination, various modifications and improvements can be made, these belong to the scope of protection of the utility model；Therefore, all with this practicality
The equivalents and modification that novel right is done, should all belong to the covering scope of the utility model claims.
Claims (10)
1. a kind of fire-fighting two lines bus short-circuit protection circuit of hand-held encoder, which is characterized in that including：Fire-fighting two lines bus can be connected
Host circuit is used to acquire and handle the signal acquisition circuit (100) of fire-fighting two lines bus short-circuit signal；
Reference voltage circuit (300) for providing reference voltage；
It connect, uses with the output end of the output end of the signal acquisition circuit (100), the reference voltage circuit (300) respectively
In compare that treated the fire-fighting two lines bus short-circuit signal and the reference voltage, and export the voltage of corresponding control signal
Comparison circuit (200)；
Respectively with the output end of the voltage comparator circuit (200), the power supply of the hand-held encoder and the fire-fighting two lines bus
Host circuit connects, for receiving the control signal to be connected to or disconnect power supply and the fire-fighting two of the hand-held encoder
The power switch circuit (400) of bus host circuit.
2. the fire-fighting two lines bus short-circuit protection circuit of hand-held encoder according to claim 1, which is characterized in that the letter
Number Acquisition Circuit (100) includes that one end of resistance R7 and capacitance C1, the resistance R7 connect the fire-fighting two lines bus host circuit
Short-circuit detecting point, the other end of the resistance R7 is grounded by the capacitance C1.
3. the fire-fighting two lines bus short-circuit protection circuit of hand-held encoder according to claim 1, which is characterized in that the electricity
Pressure comparison circuit (200) include：Voltage comparator U1, resistance R5, capacitance C3, capacitance C2, wherein
The inverting input of the voltage comparator U1 connects the output end of the voltage reference circuit (300), the voltage ratio
In-phase input end compared with device U1 connects the output end of the signal acquisition circuit (100)；Described in one end connection of the resistance R5
The other end of the output end of voltage comparator U1, the resistance R5 is grounded by the capacitance C3；One end of the capacitance C2 with
The feeder ear of the voltage comparator U1 connects, the other end ground connection of the capacitance C2.
4. the fire-fighting two lines bus short-circuit protection circuit of hand-held encoder according to claim 3, which is characterized in that the electricity
It is the voltage comparator of high input voltage to press comparator U1.
5. the fire-fighting two lines bus short-circuit protection circuit of hand-held encoder according to claim 1, which is characterized in that the base
Quasi- potential circuit (300) includes：One end of resistance R4 and resistance R6, the resistance R4 connect the first DC power supply, the resistance
The other end of R4 is grounded by the resistance R6, connecting node and the voltage comparator circuit of the resistance R4 and resistance R6
(200) input terminal connection.
6. the fire-fighting two lines bus short-circuit protection circuit of hand-held encoder according to claim 5, first DC power supply
For 3.3V DC power supplies.
7. the fire-fighting two lines bus short-circuit protection circuit of hand-held encoder according to claim 1, which is characterized in that the electricity
Source switching circuit (400) includes：Resistance R1, triode Q3, resistance R3, triode Q2, resistance R2, field-effect tube Q1, wherein
The collector of the triode Q3 is connect by the resistance R1 with the second DC power supply, and the base stage of the triode Q3 connects
The output end of the voltage comparator circuit (200) is connect, the collector of the triode Q3 passes through the resistance R3 and three pole
The base stage of pipe Q2 is connected；The collector of the triode Q2 connects the grid of the field-effect tube Q1, the triode Q2's
Collector is connect by the resistance R2 with the power supply of the hand-held encoder；The source electrode of the field-effect tube Q1 connects the hand
Hold the power supply of encoder, the drain electrode of the field-effect tube Q1 connects the fire-fighting two lines bus host circuit, the triode Q3 and
The emitter of triode Q2 is grounded respectively.
8. the fire-fighting two lines bus short-circuit protection circuit of hand-held encoder according to claim 7, which is characterized in that the field
Effect pipe Q1 is enhanced P-channel field-effect transistor (PEFT) pipe.
9. the fire-fighting two lines bus short-circuit protection circuit of hand-held encoder according to claim 7, the triode Q2 and three
Pole pipe Q3 manages for NPN.
10. the fire-fighting two lines bus short-circuit protection circuit of hand-held encoder according to claim 7, second DC power supply
For 3.3V DC power supplies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820339617.XU CN207977724U (en) | 2018-03-12 | 2018-03-12 | A kind of fire-fighting two lines bus short-circuit protection circuit of hand-held encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820339617.XU CN207977724U (en) | 2018-03-12 | 2018-03-12 | A kind of fire-fighting two lines bus short-circuit protection circuit of hand-held encoder |
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| Publication Number | Publication Date |
|---|---|
| CN207977724U true CN207977724U (en) | 2018-10-16 |
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ID=63765530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820339617.XU Active CN207977724U (en) | 2018-03-12 | 2018-03-12 | A kind of fire-fighting two lines bus short-circuit protection circuit of hand-held encoder |
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| Country | Link |
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| CN (1) | CN207977724U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115454192A (en) * | 2022-10-10 | 2022-12-09 | 盈帜科技（常州）有限公司 | Two-bus circuit |
| CN115954836A (en) * | 2023-03-13 | 2023-04-11 | 电信科学技术第五研究所有限公司 | Power hot plug protection circuit of board card equipment based on current transformer |
-
2018
- 2018-03-12 CN CN201820339617.XU patent/CN207977724U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115454192A (en) * | 2022-10-10 | 2022-12-09 | 盈帜科技（常州）有限公司 | Two-bus circuit |
| CN115954836A (en) * | 2023-03-13 | 2023-04-11 | 电信科学技术第五研究所有限公司 | Power hot plug protection circuit of board card equipment based on current transformer |
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