CN209104794U - Resonance eliminates secondary circuit protective device - Google Patents
Resonance eliminates secondary circuit protective device Download PDFInfo
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- CN209104794U CN209104794U CN201822207968.8U CN201822207968U CN209104794U CN 209104794 U CN209104794 U CN 209104794U CN 201822207968 U CN201822207968 U CN 201822207968U CN 209104794 U CN209104794 U CN 209104794U
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Abstract
The utility model discloses a kind of resonance to eliminate secondary circuit protective device, including the current acquisition module for acquiring electric current when 3U0 voltage circuit open delta is shorted, for current signal to be converted to the rectification module of d. c. voltage signal, for analog voltage signal to be converted to the signal conditioning module and CPU of digital signal, the current acquisition module is connected with the rectification module input terminal, the rectification module output end is connected with the input terminal of the signal conditioning module, the output end of the signal conditioning module is connected with the CPU input terminal, the CPU output end is connected with the relay for being series at the 3U0 voltage circuit.The resonance of the utility model using the above structure eliminates secondary circuit protective device; electric current when being shorted by acquisition 3U0 voltage circuit open delta; and CPU will be transmitted to after this current signal rectification conditioning; and then 3U0 voltage circuit is disconnected through CPU control relay, open delta caused by can preventing because of silicon-controlled damage is shorted for a long time.
Description
Technical field
The utility model relates to a kind of circuit protection technologies more particularly to a kind of resonance to eliminate secondary circuit protective device.
Background technique
Secondary circuit definition: measurement circuit, relay protection circuit, switch control and signal circuit, operational power source circuit, after
The whole low tension loop such as electric blocking circuit of electric appliance and disconnecting switch.It is interconnected, is constituted to primary equipment by secondary device
The electric loop for being monitored, control, adjusting and protecting is known as secondary circuit.Be in electrical system by mutual inductor it is secondary around
The circuit that group, measurement monitoring apparatus, relay, automatic device etc. are unified by controlling cable.To control, protect, adjust, survey
The working condition of each parameter and each element in amount and monitoring primary circuit.When the silicon-controlled damage short circuit of the open delta of secondary circuit
When, it is short-circuit for a long time to will lead to open delta, may result in voltage transformer if having the generation of ground connection event at this time and burns.
Utility model content
The purpose of the utility model is to provide a kind of resonance to eliminate secondary circuit protective device, is returned by acquisition 3U0 voltage
Electric current when road open delta is shorted, and it will be transmitted to CPU after this current signal rectification conditioning, and then control relay through CPU
3U0 voltage circuit is disconnected, open delta caused by can preventing because of silicon-controlled damage is shorted for a long time.
To achieve the above object, the utility model provides a kind of resonance elimination secondary circuit protective device, including is used for
Acquire the current acquisition module of electric current when 3U0 voltage circuit open delta is shorted, for current signal to be converted to DC voltage
The rectification module of signal, signal conditioning module and CPU for analog voltage signal to be converted to digital signal, the electric current are adopted
Collection module is connected with the rectification module input terminal, the input terminal phase of the rectification module output end and the signal conditioning module
Even, the output end of the signal conditioning module is connected with the CPU input terminal, the CPU output end with to be series at the 3U0 electric
The relay for pushing back road is connected.
Preferably, the current acquisition module is current transformer.
Preferably, the rectification module is the rectification circuit being made of current-to-voltage convertor and diode.
Preferably, the signal conditioning module is the signal being made of sequentially connected operational amplification circuit and comparison circuit
Conditioning circuit.
Preferably, the utility model further includes the temperature-sensitive protective resistance being series on the 3U0 voltage circuit.
Therefore, the resonance using the above structure of the utility model eliminates secondary circuit protective device, passes through acquisition 3U0 electricity
Push back electric current when road open delta is shorted, and CPU will be transmitted to after this current signal rectification conditioning, so through CPU control after
Electric appliance disconnects 3U0 voltage circuit, and open delta caused by can preventing because of silicon-controlled damage is shorted for a long time.
Below by drawings and examples, the technical solution of the utility model is described in further detail.
Detailed description of the invention
Fig. 1 is the functional block diagram that a kind of resonance of the embodiments of the present invention eliminates secondary circuit protective device；
Fig. 2 is the circuit diagram that a kind of resonance of the embodiments of the present invention eliminates secondary circuit protective device.
Wherein: 1, current acquisition module；2, rectification module；3, signal conditioning module；4,CPU.
Specific embodiment
Below with reference to attached drawing, the utility model will be further described, it should be noted that the present embodiment is with this skill
Premised on art scheme, the detailed implementation method and specific operation process are given, but the protection scope of the utility model is not
It is limited to the present embodiment.
Fig. 1 is the functional block diagram that a kind of resonance of the embodiments of the present invention eliminates secondary circuit protective device, and Fig. 2 is this
A kind of resonance of the embodiment of utility model eliminates the circuit diagram of secondary circuit protective device, as depicted in figs. 1 and 2, this reality
With novel structure, including for acquiring the current acquisition module 1 of electric current when 3U0 voltage circuit open delta is shorted, for will
Current signal is converted to the rectification module 2 of d. c. voltage signal, the signal for analog voltage signal to be converted to digital signal
Conditioning module 3 and CPU4 (central processing unit), current acquisition module 1 are connected with 2 input terminal of rectification module, rectification module output
End is connected with the input terminal of signal conditioning module 3, and the output end of signal conditioning module 3 is connected with CPU4 input terminal, CPU4 output
It holds and is connected with the relay K1 for being series at 3U0 voltage circuit.Specifically, current acquisition module 1 is current transformer.Rectify mould
Block 2 is the rectification circuit being made of current-to-voltage convertor and diode.Signal conditioning module 3 is to be put by sequentially connected operation
The signal conditioning circuit of big circuit and comparison circuit composition.The utility model further includes the temperature-sensitive being series on 3U0 voltage circuit
Protective resistance, when the silicon-controlled short circuit of open delta, current transformer acquires ac current signal, through current-to-voltage convertor
Ac current signal is converted into ac voltage signal, then ac voltage signal is converted into d. c. voltage signal through diode,
It is converted in digital quantity signal input CPU4 after and through signal conditioning circuit, when the signal acquisition value of input CPU4 is greater than the set value
When, CPU4 controls relay K1 and disconnects 3U0 voltage circuit, protects open delta, prevents open delta caused by silicon-controlled damage
It is shorted for a long time, and structure is simple, it is at low cost.
Therefore, the resonance using the above structure of the utility model eliminates secondary circuit protective device, passes through acquisition 3U0 electricity
Push back electric current when road open delta is shorted, and CPU will be transmitted to after this current signal rectification conditioning, so through CPU control after
Electric appliance disconnects 3U0 voltage circuit, and open delta caused by can preventing because of silicon-controlled damage is shorted for a long time.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model rather than limit it
System, although the utility model has been described in detail with reference to the preferred embodiment, those skilled in the art should manage
Solution: it still can be with the technical solution of the present invention is modified or equivalently replaced, and these are modified or equally replace
Changing also cannot make modified technical solution be detached from the spirit and scope of the technical scheme of the present invention.
Claims (5)
1. a kind of resonance eliminates secondary circuit protective device, it is characterised in that: including for acquiring 3U0 voltage circuit open delta
The current acquisition module of electric current when short circuit, is used for mould the rectification module for current signal to be converted to d. c. voltage signal
Quasi- voltage signal is converted to the signal conditioning module and CPU of digital signal, and the current acquisition module and the rectification module are defeated
Enter end to be connected, the rectification module output end is connected with the input terminal of the signal conditioning module, the signal conditioning module
Output end is connected with the CPU input terminal, and the CPU output end is connected with the relay for being series at the 3U0 voltage circuit.
2. a kind of resonance according to claim 1 eliminates secondary circuit protective device, it is characterised in that: the current acquisition
Module is current transformer.
3. a kind of resonance according to claim 1 eliminates secondary circuit protective device, it is characterised in that: the rectification module
For the rectification circuit being made of current-to-voltage convertor and diode.
4. a kind of resonance according to claim 1 eliminates secondary circuit protective device, it is characterised in that: the signal condition
Module is the signal conditioning circuit being made of sequentially connected operational amplification circuit and comparison circuit.
5. a kind of resonance according to claim 1 eliminates secondary circuit protective device, it is characterised in that: further include being series at
Temperature-sensitive protective resistance on the 3U0 voltage circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822207968.8U CN209104794U (en) | 2018-12-26 | 2018-12-26 | Resonance eliminates secondary circuit protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822207968.8U CN209104794U (en) | 2018-12-26 | 2018-12-26 | Resonance eliminates secondary circuit protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209104794U true CN209104794U (en) | 2019-07-12 |
Family
ID=67163436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822207968.8U Active CN209104794U (en) | 2018-12-26 | 2018-12-26 | Resonance eliminates secondary circuit protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209104794U (en) |
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2018
- 2018-12-26 CN CN201822207968.8U patent/CN209104794U/en active Active
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