CN207650383U - A kind of transformer disconnection detection circuit of breaker - Google Patents
A kind of transformer disconnection detection circuit of breaker Download PDFInfo
- Publication number
- CN207650383U CN207650383U CN201721779408.9U CN201721779408U CN207650383U CN 207650383 U CN207650383 U CN 207650383U CN 201721779408 U CN201721779408 U CN 201721779408U CN 207650383 U CN207650383 U CN 207650383U
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- sub
- resistor
- detection circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Breakers (AREA)
Abstract
The utility model is related to a kind of transformer disconnection detection circuits of breaker, to detect transformer secondary output line terminal with the presence or absence of broken string, the detection circuit includes sequentially connected conducting sub-circuit, partial pressure sub-circuit and amplification detection sub-circuit, conducting sub-circuit and amplification detection sub-circuit are connect with the I/O port pin of MCU respectively, and the partial pressure sub-circuit is connect with transformer secondary output line terminal.Compared with prior art, the utility model have many advantages, such as quick and precisely, highly effective and safe.
Description
Technical field
The utility model is related to breaker, mutual inductor sample technical fields, more particularly, to a kind of mutual inductor of breaker
Break detection circuit.
Background technology
The sample mode of breaker at present, it is common that loop current mutual inductance is gone out by voltage signal by mutual inductor, by secondary
Grade output interface is connected with low pressure controller.Amplifying circuit is put by controller integrating circuit and operation again to send signal to MCU
Sampling module obtains loop current value eventually by conversion.
Transformer disconnection detection circuit is the auxiliary detection function of breaker sampling, is mainly detected on breaker busbar mutually
Inside sensor and secondary output line is either with or without in the presence of broken string.Mutual inductor is once break, and just inspection does not measure low pressure controller completely
Electric current on circuit, if user repairs and replace not in time breaker, there will be the serious risks of switch demolition.
Utility model content
The purpose of this utility model is exactly to provide a kind of breaker to overcome the problems of the above-mentioned prior art
Transformer disconnection detection circuit.
The purpose of this utility model can be achieved through the following technical solutions：
A kind of transformer disconnection detection circuit of breaker, to detect transformer secondary output line terminal with the presence or absence of disconnected
Line, the detection circuit include sequentially connected conducting sub-circuit, partial pressure sub-circuit and amplification detection sub-circuit, conducting sub-circuit and
Amplification detection sub-circuit is connect with the I/O port pin of MCU respectively, and the partial pressure sub-circuit connects with transformer secondary output line terminal
It connects.
The conducting sub-circuit includes triode, and the collector including triode is connect with power supply, emitter
It is connect with partial pressure sub-circuit, base stage is connected by the I/O port pin of the first current-limiting resistance and MCU.
The base stage of the triode is also grounded by filter capacitor.
The partial pressure sub-circuit includes first resistor, second resistance and 3rd resistor, the emitter of the triode,
It is sequentially connected to first resistor, second resistance and 3rd resistor and system power supply, internal resistance one end of the mutual inductor is connected to
Between first resistor, second resistance, the other end is connected between 3rd resistor and system power supply ground, amplification detection son electricity
Road is connected to by the second current-limiting resistance between second resistance and 3rd resistor.
The amplification detection sub-circuit includes operational amplifier, the forward end of the operational amplifier and the second current limliting
Resistance connects, and negative end is connect with output end, and output end is connected by the I/O port pin of output resistance and MCU.
The resistance value of the first resistor is the Europe 1.4K, and the resistance value of second resistance is the Europe 3K, and the resistance value of 3rd resistor is 3K
Europe, power supply 5V.
Compared with prior art, the utility model has the following advantages：
The utility model can fast and accurately detect whether mutual inductor breaks, when breaker shows that electric current is 0A, if
When circuit is implicitly present in electric current, caused by can quickly positioning transformer disconnection or since rear class operational amplification circuit loses
It caused by effect is possible, can notify, to user, user to be allowed to replace breaker in time by way of alarm in first time, reduce
Breaker may due to broken string cause loop circuit actually excessive and not detected cause switch demolish the case where.
Description of the drawings
Fig. 1 is the circuit diagram of the utility model.
Specific implementation mode
The utility model is described in detail in the following with reference to the drawings and specific embodiments.
Embodiment
As shown in Figure 1, the utility model provides a kind of transformer disconnection detection circuit of breaker, in figure, Q1 is three poles
Pipe, R1 and R5 are current-limiting resistance, R6 is output resistance, R2, R3, R4 divider resistance, and CT1 is transformer secondary leading-out terminal, and IC1 is
Operational amplifier, VCC are system power supply power supply, GND for system power supply, P40 and the I/O port pin that AD1 is MCU.
The operation principle of the utility model is as follows：
When carrying out burn out detection, the I/O port pin P40 of MCU exports high level, the Q1 conductings of driving triode, and VCC passes through
First resistor R2 is acted on after triode Q1 conductings, wherein C1 is filter capacitor, to improve anti-interference.
The internal resistance of divider resistance R2, R3, R4 and CT1 mutual inductor constitutes bleeder circuit, according to the broken string of mutual inductor and constantly
Line both of these case exports two kinds of voltage values：
The first situation is when transformer disconnection, and electric resistance partial pressure approximation regards the partial pressure of R2, R3 and R4 as, and R4 divides at this time
Voltage be fixed value 2V；
The second situation is when mutual inductor does not break, since the internal resistance of mutual inductor is much smaller than the concatenated electricity of R3 and R4
Resistance, thus the voltage at the both ends R3 and R4 is approximately equal to mutual inductor internal resistance and R2 and connects the voltage value got, about 400mV, in turn
The both end voltage of R4 is about 200mV, voltage when much smaller than broken string.
By the both end voltage of R4 by in-phase proportion operational amplification circuit (voltage follower), reduce output impedance, increases
The voltage of the I/O port pin AD1 of MCU.Wherein R5 is current-limiting resistance, output resistance R6 to improve the output resistance of amplifier because
The characteristics of voltage follower is input impedance height, and output impedance is very small, and generally only tens Europe, R6 generally choose hundreds of Europe
Hereinafter, cannot be excessive.C2 is the interference resistance for improving amplifier chip.
MCU judged according to the voltage value of sampling out, once detect be 2V voltage, with regard to output alarm signal,
User's mutual inductor is reminded to be in broken string state, user needs on-call maintenance or replaces breaker, reduces failure.
The above is only a kind of embodiment of the utility model, is not made in any form to the utility model
Limitation, it is made by the above technical examples according to the technical essence of the present invention it is any it is simple modification, equivalent variations with
Modification, is still within the scope of the technical solutions of the present invention.
Claims (6)
1. a kind of transformer disconnection detection circuit of breaker whether there is to detect transformer secondary output line terminal (CT1)
Broken string, which is characterized in that the detection circuit includes sequentially connected conducting sub-circuit, partial pressure sub-circuit and amplification detection son electricity
Road, is connected sub-circuit and amplification detection sub-circuit is connect with the I/O port pin of MCU respectively, the partial pressure sub-circuit and mutual inductor
Secondary output line terminal (CT1) connection.
2. a kind of transformer disconnection detection circuit of breaker according to claim 1, which is characterized in that the conducting
Sub-circuit includes triode (Q1), and the collector including triode (Q1) is connect with power supply (VCC), emitter and partial pressure
Sub-circuit connects, and base stage is connect by the first current-limiting resistance (R1) with the I/O port pin (P40) of MCU.
3. a kind of transformer disconnection detection circuit of breaker according to claim 2, which is characterized in that three poles
The base stage for managing (Q1) is also grounded by filter capacitor (C1).
4. a kind of transformer disconnection detection circuit of breaker according to claim 2, which is characterized in that the partial pressure
Sub-circuit includes first resistor (R2), second resistance (R3) and 3rd resistor (R4), the emitter of the triode (Q1),
It is sequentially connected to one resistance (R2), second resistance (R3) and 3rd resistor (R4) and system power supply, the internal resistance of the mutual inductor
One end is connected between first resistor (R2), second resistance (R3), and the other end is with being connected to 3rd resistor (R4) and system power supply
Between, the amplification detection sub-circuit is connected to second resistance (R3) and 3rd resistor (R4) by the second current-limiting resistance (R5)
Between.
5. a kind of transformer disconnection detection circuit of breaker according to claim 4, which is characterized in that the amplification
It includes operational amplifier (IC1), the forward end and the second current-limiting resistance (R5) of the operational amplifier (IC1) to detect sub-circuit
Connection, negative end are connect with output end, and output end is connect by output resistance (R6) with the I/O port pin (AD1) of MCU.
6. a kind of transformer disconnection detection circuit of breaker according to claim 4, which is characterized in that described first
The resistance value of resistance (R2) is the Europe 1.4K, and the resistance value of second resistance (R3) is the Europe 3K, and the resistance value of 3rd resistor (R4) is the Europe 3K, power supply
(VCC) it is 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721779408.9U CN207650383U (en) | 2017-12-19 | 2017-12-19 | A kind of transformer disconnection detection circuit of breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721779408.9U CN207650383U (en) | 2017-12-19 | 2017-12-19 | A kind of transformer disconnection detection circuit of breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207650383U true CN207650383U (en) | 2018-07-24 |
Family
ID=62877803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721779408.9U Active CN207650383U (en) | 2017-12-19 | 2017-12-19 | A kind of transformer disconnection detection circuit of breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207650383U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932673A (en) * | 2017-12-19 | 2019-06-25 | 上海亿盟电气自动化技术有限公司 | A kind of transformer disconnection detection circuit of breaker |
| CN111486003A (en) * | 2019-12-27 | 2020-08-04 | 江苏恩达通用设备有限公司 | Rotational speed signal acquisition circuit with broken string detects function |
-
2017
- 2017-12-19 CN CN201721779408.9U patent/CN207650383U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932673A (en) * | 2017-12-19 | 2019-06-25 | 上海亿盟电气自动化技术有限公司 | A kind of transformer disconnection detection circuit of breaker |
| CN111486003A (en) * | 2019-12-27 | 2020-08-04 | 江苏恩达通用设备有限公司 | Rotational speed signal acquisition circuit with broken string detects function |
| CN111486003B (en) * | 2019-12-27 | 2022-04-05 | 江苏恩达通用设备有限公司 | Rotational speed signal acquisition circuit with broken string detects function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201349121Y (en) | Direct current input overvoltage and under-voltage protection circuit | |
| CN204188702U (en) | A kind of current detection circuit | |
| CN109932673A (en) | A kind of transformer disconnection detection circuit of breaker | |
| CN207650383U (en) | A kind of transformer disconnection detection circuit of breaker | |
| CN103852674A (en) | Residual current transformer secondary coil disconnection detection circuit | |
| CN203720278U (en) | Vehicle microphone status detecting circuit | |
| CN103336165A (en) | Detection circuit for overcurrent of alternating current and direct current | |
| CN205792219U (en) | A kind of dummy load circuit of power circuit | |
| CN107271763B (en) | Current sampling circuit, electronic trip unit, breaker | |
| CN204928079U (en) | Current foldback circuit , power factor correction circuit and transducer air conditioning | |
| CN201903573U (en) | Current detection and amplification circuit used for two-wire manufactured instrument | |
| CN209014646U (en) | The current detection circuit and electric machine controller of direct measuring type Hall sensor | |
| CN208092205U (en) | A kind of closed-loop detection circuit for detecting relay output state | |
| CN103236679A (en) | Electronic type backup protection device for AC (alternating current) circuit breaker | |
| CN104577961B (en) | Over-pressed power-off protecting circuit | |
| CN201479113U (en) | Trigger interface circuit irrespective of polarity | |
| CN202421457U (en) | Motor over-current detection circuit | |
| CN204719122U (en) | A kind of voltage detecting warning circuit | |
| CN203324355U (en) | Microwave-system diverse self-checking circuit | |
| CN105116200B (en) | A kind of detection circuit of compatible switch amount and level amount | |
| CN112485494A (en) | Current detection circuit based on triode | |
| CN209881652U (en) | Digital input EMC circuit applied to crane control system | |
| CN209513895U (en) | A kind of current sampling circuit for motor control | |
| CN202840472U (en) | Electric leakage protection device | |
| CN206353703U (en) | Battery lamp load short-circuit protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |