CN206461343U - Power protecting circuit - Google Patents
Power protecting circuit Download PDFInfo
- Publication number
- CN206461343U CN206461343U CN201720053584.8U CN201720053584U CN206461343U CN 206461343 U CN206461343 U CN 206461343U CN 201720053584 U CN201720053584 U CN 201720053584U CN 206461343 U CN206461343 U CN 206461343U
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- circuit
- coupled
- reference voltage
- comparison
- resistance
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Abstract
The utility model discloses a kind of power protecting circuit, the first protection circuit including being coupled to power supply, it is coupled to the rectification circuit of the first protection circuit, it is coupled to the overvoltage crowbar of rectification circuit, overvoltage crowbar includes the reference voltage generating circuit for being coupled to rectification circuit, it is coupled to the bleeder circuit of rectification circuit, it is coupled to the comparison circuit of reference voltage generating circuit and bleeder circuit, be coupled to comparison circuit and output control signal with control transformer work on-off circuit, overvoltage crowbar is provided with power protecting circuit, by the sampled signal for gathering input power, contrasted with reference voltage, when sampled signal is more than reference voltage, on-off circuit controls transformer to be stopped, so as to reach the purpose of protection transformer, and reference voltage is equally provided by input power；Warning circuit can send alarm to play the purpose of prompting while staff's wrong plug power supply.
Description
Technical field
The utility model is related to power protection field, more specifically, it relates to a kind of power protecting circuit.
Background technology
With expanding economy, increasing high buildings and large mansions are rised sheer from level ground, this just unavoidable installation in high buildings and large mansions
Elevator.Wherein, many electronic equipments are provided with elevator, it is necessary to use different power supplys, such as elevator starts and needs to use 380V
Voltage, and the supply voltage of liquid crystal display, intercom in elevator etc. need to pass through after civil power transformation and obtain.To sum up, it is electric
Multiple voltage is provided with ladder, once but workman's wrong plug power supply when elevator is installed, such as will only need to access civil power
Device has been accessed in 380V voltage, i.e., insert the device of low-voltage on high voltage, and the transformer that can be damaged in power supply is led
Send a telegraph source unavailable.
Utility model content
In view of the deficienciess of the prior art, the purpose of this utility model is to provide a kind of power protecting circuit, in work
During people's wrong plug supply voltage, the transformer in power supply can be protected.
To achieve the above object, the utility model provides following technical scheme：
A kind of power protecting circuit, including it is coupled to being protected for suppressing start surge and anti-lightning strike first for power supply
Circuit, be coupled to first protection circuit output end rectification circuit, be coupled to the rectification circuit be used for control become
The overvoltage crowbar of depressor work, wherein, the overvoltage crowbar includes：Reference voltage generating circuit, is coupled to described
The output end of rectification circuit, for generating stable reference voltage；Bleeder circuit, is coupled to the output end of the rectification circuit,
For generating the sampled signal compared with the reference voltage；Comparison circuit, is coupled to the reference voltage generating circuit and institute
Bleeder circuit is stated to receive the reference voltage and the sampled signal, for comparing the reference voltage and the sampled signal
Size, export a comparison signal；On-off circuit, is coupled to the output end of the comparison circuit to receive the comparison signal,
And output control signal is to control the transformer to work.
By using above-mentioned technical proposal, when the circuit is accessed on power supply, the protection of the first protection circuit is first passed through,
It can prevent start surge and thunderbolt from causing the influence to circuit below；Direct current is being obtained by the rectified action of rectification circuit,
Stable reference voltage is exported after DC supply input reference voltage generating circuit processing, meanwhile, DC supply input partial pressure electricity
Sampled signal, sampled signal and supply voltage positive correlation are exported after the processing of road, comparison circuit receives reference voltage and sampled signal
After be compared, and by comparative result to be exported in the form of comparison signal into on-off circuit, electricity is then controlled by on-off circuit
Whether depressor works.
Further, when the reference voltage is less than the sampled signal, the institute of the comparison circuit output end output
Comparison signal is stated to control the on-off circuit to stop transformer work.
Further, the reference voltage generating circuit includes：
Filtering unit, is coupled to the rectification circuit, is filtered for the electric current to input；
Stabipack, is coupled to the filtering unit, for generating stable reference voltage.
By using above-mentioned technical proposal, after the direct current after the rectifier circuit rectifies after filtering filter action of component
More stablize, then a stable reference voltage is obtained by the pressure stabilization function of stabipack.
Further, the stabipack includes voltage-regulator diode D3.
By using above-mentioned technical proposal, voltage-regulator diode D3 can be stable on the voltage of its setting by reference voltage.
Further, the bleeder circuit includes the resistance R2 and resistance R3 of series connection, wherein, resistance R2 other end coupling
In the output end of the rectification circuit, the resistance R3 other end is grounded, and the tie point of the resistance R2 and resistance R3 are coupled to institute
State comparison circuit and export the sampled signal.
By using above-mentioned technical proposal, acted on by the partial pressure of bleeder circuit, obtain sampled signal, when staff will
When in circuit access High Voltage Power Supply power supply, the sampled signal of acquisition is higher than reference voltage；When staff connects the circuit
When in power supply as defined in entering, the sampled signal of acquisition is less than reference voltage.
Further, the comparison circuit includes operational amplifier, and the in-phase input end of the operational amplifier is coupled to
The tie point of the resistance R2 and resistance R3 are to receive the sampled signal, and inverting input is coupled to the defeated of the stabipack
Go out end to receive the reference voltage, output end exports the comparison signal.
By using above-mentioned technical proposal, when sampled signal is more than reference voltage, the output end output of operational amplifier
The comparison signal of high level；Conversely, the output end of operational amplifier exports low level comparison signal.
Further, the on-off circuit includes switch element, the Yi Jishou for being coupled to the operational amplifier output terminal
Control the executive component for being used to control transformer to work in the switch element.
By using above-mentioned technical proposal, the control to transformer is directly completed by switch element and executive component, made
The mode that must be controlled is more simple, easily implements, and easily repair and maintenance.
Further, the switch element uses triode or IGCT or optocoupler.
By using above-mentioned technical proposal, triode or IGCT or optocoupler are relatively conventional element, and circuit knot
Structure is simple, easily implements, with low cost, is easy to the maintenance in later stage.
Further, the executive component includes bidirectional triode thyristor, and the control pole of the bidirectional triode thyristor is coupled to described
Switch element, two master control poles are connected to transformer and ground.
By using above-mentioned technical proposal, when the control pole of bidirectional triode thyristor receives low level signal, bidirectional triode thyristor
Cut-off, so that short-circuit between transformer and ground, whole circuit does not become loop, so as to reach the work of protection transformer
With.
Further, the power protecting circuit also includes the warning circuit for being used to remind staff's wrong plug power supply, institute
Warning circuit is stated to be coupled to the output end of the comparison circuit and controlled by the comparison signal.
By using above-mentioned technical proposal, the setting of warning circuit can remind them in staff's wrong plug power supply,
To adjust power supply in time.
Compared with prior art, the utility model has the advantages that：Overvoltage crowbar is provided with power protecting circuit, is led to
The sampled signal of collection input power is crossed, is contrasted with reference voltage, when sampled signal is more than reference voltage, on-off circuit
Transformer is controlled to be stopped, so that the purpose of protection transformer is reached, and reference voltage is equally provided by input power；Report
Alert circuit can send alarm to play the purpose of prompting while staff's wrong plug power supply.
Brief description of the drawings
Fig. 1 is system block diagram of the present utility model；
Fig. 2 is the circuit theory diagrams of embodiment one；
Fig. 3 is the circuit theory diagrams of embodiment two.
Reference：1st, the first protection circuit；2nd, rectification circuit；3rd, overvoltage crowbar；31st, reference voltage generation electricity
Road；32nd, bleeder circuit；33rd, comparison circuit；34th, on-off circuit；341st, switch element；342nd, executive component；4th, transformer；5、
Warning circuit.
Embodiment
With reference to the accompanying drawings and examples, the utility model is described in detail.
Embodiment one
A kind of power protecting circuit, reference picture 1, including be coupled to power supply be used for suppress start surge and anti-lightning strike
First protection circuit 1, the rectification circuit 2 for being coupled to the output end of the first protection circuit 1, be coupled to rectification circuit 2 be used for control
The overvoltage crowbar 3 that transformer 4 works, when the circuit is connected in the power supply higher than setting voltage by staff,
Switch overvoltage crowbar 3 makes transformer 4 be stopped, and reaches the effect of protection transformer 4.Wherein, overvoltage crowbar 3 is wrapped
Include and be coupled to being used to generate the reference voltage generating circuit 31 of stable reference voltage, being coupled to rectification for the output end of rectification circuit 2
The output end of circuit 2 be used for generate compared with reference voltage sampled signal bleeder circuit 32, be coupled to reference voltage generate
Circuit 31 and bleeder circuit 32 are used for benchmark voltage and sampled signal size simultaneously with receive reference voltage and sampled signal
Export the comparison circuit 33 of a comparison signal and be coupled to the output end of comparison circuit 33 to receive comparison signal and output control
Signal is to control the on-off circuit 34 that transformer 4 works, and when reference voltage is less than sampled signal, the output end of comparison circuit 33 is defeated
The comparison signal controlling switch circuit 34 gone out is worked with stopping transformer 4.
Reference picture 2, the first protection circuit 1 includes fuse F1, piezo-resistance RU and the thermistor NTC being sequentially connected in series,
And the fuse F1 other end is coupled to the live wire of power supply, the thermistor NTC other end is coupled to the zero of power supply
Line.Wherein, thermistor NTC can effectively suppress start when surge current, and complete suppress surge current effect with
Afterwards, due to the continuous action by its electric current, thermistor NTC resistance value would fall to very small degree, what it was consumed
Power be can be ignored, and normal operating current will not be impacted；And height is presented in piezo-resistance RU under normal circumstances
Resistance state, when meeting with thunderbolt, short-circuit condition is presented after exceeding threshold value in piezo-resistance RU, then short between live wire and zero line
Road, then burns up above fuse F1, to play a part of protection circuit below, to prevent high pressure from making circuit on fire.
Rectification circuit 2 is coupled to piezo-resistance RU two ends, including be connected with fuse F1 and piezo-resistance RU tie points
Diode D1, the negative electrode that electric capacity C2, anode are coupled to the electric capacity C2 other ends are coupled to two poles of the electric capacity C2 other ends
Pipe D2 and positive pole are coupled to diode D1 negative electrodes and negative pole is coupled to the electrochemical capacitor C3 of diode D2 anodes, supply current
Become direct current electricity output after rectification circuit 2.
Filtering unit in reference voltage generating circuit 31 receives above-mentioned direct current and considered except interference signal, then by voltage stabilizing
Stable reference voltage is generated after component.Wherein, filtering unit includes resistance R1, the positive pole coupling for being coupled to electrochemical capacitor C3 positive poles
Be connected to the electrochemical capacitor C4 of the resistance R1 other ends, electrochemical capacitor C4 negative pole is coupled to zero line, direct current pass through by resistance R1 and
More pure direct current is obtained after the RC filter circuits that electrochemical capacitor C4 is constituted, the direct current after voltage-regulator diode D3 by obtaining
Stable reference voltage.
Bleeder circuit 32 includes the resistance R2 and resistance R3 of series connection, wherein, the resistance R2 other end is coupled to electrochemical capacitor
C3 positive pole, the resistance R3 other end is coupled to the tie point output sampled signal of zero line, resistance R2 and resistance R3.Comparison circuit
33 include operational amplifier, and the in-phase input end of operational amplifier is coupled to resistance R2 and resistance R3 tie point to receive sampling
Signal, inverting input is coupled to voltage-regulator diode D3 to receive reference voltage, output end output comparison signal.Work as sampled signal
During more than reference voltage, the output end of operational amplifier exports the comparison signal of high level.In the present embodiment, operational amplifier is adopted
Use LM358.
On-off circuit 34 includes being coupled to the switch element 341 of operational amplifier output terminal and is controlled by switch element
341 executive component 342 for being used to control transformer 4 to work.In the present embodiment, switch element 341 uses NPN triode, holds
Units 342 use bidirectional triode thyristor, and the base stage of NPN triode is coupled to the output end of operational amplifier to connect by resistance R6
Comparison signal is received, emitter stage is coupled to zero line, and colelctor electrode is coupled to the control pole of bidirectional triode thyristor, two masters of bidirectional triode thyristor
Control pole is connected to transformer 4 and zero line.When comparison signal is high level, NPN triode conducting, the control of bidirectional triode thyristor
The extremely direct connecting to neutral line of system, causes bidirectional triode thyristor to end, transformer 4 is stopped.In another embodiment, switch element
341 use IGCT, and the control pole of IGCT is coupled to the output end of operational amplifier, and negative electrode and anode are respectively coupled to two-way
The control pole and zero line of controllable silicon.In another embodiment, switch element 341 uses optocoupler.
The operation principle of the present embodiment：
When during the circuit to be accessed to staff the power supply for exceeding setting voltage, after the first protection circuit 1
Rectification circuit 2 is passed through again and carries out rectification acquisition direct current, and the direct current is obtained after RC filter circuits and voltage-regulator diode D3
Stable reference voltage, the reference voltage will not be widely varied with the change of supply voltage；Meanwhile, after over commutation
Direct current be passed through in bleeder circuit 32, by resistance R2 and resistance R3 partial pressure effect obtain sampled signal, the sampled signal
It is proportionate with supply voltage, the in-phase input end and anti-phase input of sampled signal and reference voltage difference input operational amplifier
End, after being handled through operational amplifier, export high level comparison signal, now, NPN triode conducting so that cause it is two-way can
Silicon cut-off is controlled so that transformer 4 does not work, so as to reach the purpose of protection transformer 4；Meanwhile, when supply voltage recovers to set
When determining voltage, the circuit can normally be worked again.
Embodiment two
A kind of power protecting circuit, reference picture 3, the difference with embodiment one is that the power protecting circuit also includes using
In the warning circuit 5 for reminding staff's wrong plug power supply, the warning circuit 5 includes the light emitting diode D4 for being parallel to resistance R6,
Wherein, light emitting diode D4 positive pole is coupled to the output end of operational amplifier, when comparison signal is high level, light-emitting diodes
Pipe D4 lights to remind staff.Another embodiment of warning circuit 5 can be buzzer, and work is reminded in a voice form
Personnel；Or combined with light emitting diode.
Described above is only preferred embodiment of the present utility model, and protection domain of the present utility model is not limited merely to
Above-described embodiment, all technical schemes belonged under the utility model thinking belong to protection domain of the present utility model.It should refer to
Go out, for those skilled in the art, some improvement under the premise of the utility model principle is not departed from and
Retouching, these improvements and modifications also should be regarded as protection domain of the present utility model.
Claims (10)
1. a kind of power protecting circuit, it is characterised in that including be coupled to power supply be used for suppress start surge and lightning protection
Hit the first protection circuit (1), be coupled to first protection circuit (1) output end rectification circuit (2), be coupled to it is described whole
The overvoltage crowbar (3) for being used to control transformer (4) to work of current circuit (2), wherein, overvoltage crowbar (3) bag
Include：
Reference voltage generating circuit (31), is coupled to the output end of the rectification circuit (2), the benchmark electricity stable for generating
Pressure；
Bleeder circuit (32), is coupled to the output end of the rectification circuit (2), for generating and adopting that the reference voltage is compared
Sample signal；
Comparison circuit (33), is coupled to the reference voltage generating circuit (31) and the bleeder circuit (32) to receive the base
Quasi- voltage and the sampled signal, the size for comparing the reference voltage and the sampled signal export a comparison signal；
On-off circuit (34), is coupled to the output end of the comparison circuit (33) to receive the comparison signal, and output control
Signal with control the transformer (4) work.
2. power protecting circuit according to claim 1, it is characterised in that when the reference voltage is less than the sampling letter
Number when, the comparison signal of comparison circuit (33) output end output controls the on-off circuit (34) to stop transformer
(4) work.
3. power protecting circuit according to claim 2, it is characterised in that reference voltage generating circuit (31) bag
Include：
Filtering unit, is coupled to the rectification circuit (2), is filtered for the electric current to input；
Stabipack, is coupled to the filtering unit, for generating stable reference voltage.
4. power protecting circuit according to claim 3, it is characterised in that the stabipack includes voltage-regulator diode
D3。
5. power protecting circuit according to claim 4, it is characterised in that the bleeder circuit (32) includes the electricity of series connection
R2 and resistance R3 is hindered, wherein, the resistance R2 other end is coupled to the output end of the rectification circuit (2), the resistance R3 other end
Ground connection, the tie point of the resistance R2 and resistance R3 is coupled to the comparison circuit (33) and exports the sampled signal.
6. power protecting circuit according to claim 5, it is characterised in that the comparison circuit (33) includes operation amplifier
Device, the in-phase input end of the operational amplifier is coupled to the resistance R2 and resistance R3 tie point to be believed with receiving the sampling
Number, inverting input is coupled to the output end of the stabipack to receive the reference voltage, and output end exports the comparison
Signal.
7. power protecting circuit according to claim 6, it is characterised in that the on-off circuit (34) includes being coupled to institute
State the switch element (341) of operational amplifier output terminal and be controlled by the switch element (341) be used for control transformer
(4) executive component (342) of work.
8. power protecting circuit according to claim 7, it is characterised in that the switch element (341) uses triode
Or IGCT or optocoupler.
9. power protecting circuit according to claim 8, it is characterised in that the executive component (342) include it is two-way can
Silicon is controlled, the control pole of the bidirectional triode thyristor is coupled to the switch element (341), and two master control poles are connected to transformer
And ground (4).
10. power protecting circuit according to claim 1, it is characterised in that the power protecting circuit also includes being used for
The warning circuit (5) of staff's wrong plug power supply is reminded, the warning circuit (5) is coupled to the output of the comparison circuit (33)
Hold and controlled by the comparison signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720053584.8U CN206461343U (en) | 2017-01-18 | 2017-01-18 | Power protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720053584.8U CN206461343U (en) | 2017-01-18 | 2017-01-18 | Power protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206461343U true CN206461343U (en) | 2017-09-01 |
Family
ID=59699343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720053584.8U Expired - Fee Related CN206461343U (en) | 2017-01-18 | 2017-01-18 | Power protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206461343U (en) |
-
2017
- 2017-01-18 CN CN201720053584.8U patent/CN206461343U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170901 Termination date: 20200118 |