CN207705772U - A kind of earth leakage protective device - Google Patents
A kind of earth leakage protective device Download PDFInfo
- Publication number
- CN207705772U CN207705772U CN201820129262.1U CN201820129262U CN207705772U CN 207705772 U CN207705772 U CN 207705772U CN 201820129262 U CN201820129262 U CN 201820129262U CN 207705772 U CN207705772 U CN 207705772U
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- circuit
- protective device
- earth leakage
- leakage protective
- zener diode
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Abstract
The utility model is related to electric control technical field, more particularly to a kind of earth leakage protective device, including the rectification circuit, sensor circuit, detection circuit, amplifying circuit and the control circuit that are linked in sequence；It is in series with Voltage stabilizing module and current limliting module respectively between the sensor circuit and the detection circuit.The present apparatus is not only simple in structure, at low cost, and good working effect, can be effectively protected the security of the lives and property of people.
Description
Technical field
The utility model is related to electric control technical field more particularly to a kind of earth leakage protective devices.
Background technology
In circuit, there can be the situation that can't pass when doing surge experiment, if in actual use, when having in circuit
Peak voltage and peak current generate, it will so that the electronic component in circuit is punctured or is burnt, to make entire earth leakage protective
Circuit malfunction endangers the statement property safety of people.Therefore, it is badly in need of a kind of effective solution method.
Utility model content
The purpose of the utility model is to overcome above-mentioned problem of the prior art, provide a kind of earth leakage protective device, lead to
Cross and be in series with Voltage stabilizing module and current limliting module between sensor circuit and detection circuit, come reach to voltage carry out voltage stabilizing clamper and
Current limliting is carried out to electric current, to protect the component of subsequent detection circuit not destroyed, it is ensured that normal operation circuit protects people's
The security of the lives and property.
Above-mentioned purpose is to be achieved through the following technical solutions：
A kind of earth leakage protective device, including be linked in sequence rectification circuit, sensor circuit, detection circuit, amplifying circuit and
Control circuit；It is in series with Voltage stabilizing module and current limliting module respectively between the sensor circuit and the detection circuit.
Further, the Voltage stabilizing module includes the first zener diode D1 and the second zener diode being serially connected
D2。
Further, first zener diode and second zener diode are BZG05C3V3, specified voltage stabilizing value
For 3.3V.
Further, the current limliting module includes the current-limiting resistance R52 being serially connected and fusing resistor R53.
Further, the resistance value of the current-limiting resistance R52 is 39R, and the resistance value of the fusing resistor R53 is 0R.
Further, the control circuit includes reverse-blocking tetrode thyristor P1, is used for the energization or disconnection of circuit.
Advantageous effect
The utility model between sensor circuit and detection circuit by being in series with Voltage stabilizing module and current limliting module, to reach
Voltage stabilizing clamper is carried out to voltage and current limliting is carried out to electric current, to protect the component in subsequent detection circuit not destroyed, really
Protect normal operation circuit.The present apparatus is not only simple in structure, at low cost, and good working effect, can be effectively protected the life of people
Property safety.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of earth leakage protective device described in the utility model；
Fig. 2 is a kind of circuit diagram of earth leakage protective device described in the utility model.
Specific implementation mode
The utility model is described in further detail with reference to figure and embodiment.
As shown in Figure 1, a kind of earth leakage protective device, including be linked in sequence rectification circuit, sensor circuit, detection circuit,
Amplifying circuit and control circuit；It is in series with Voltage stabilizing module and current limliting mould respectively between the sensor circuit and the detection circuit
Block.The rectification circuit is connect with external power source circuit, for by the AC rectification inputted in power circuit at direct current；Institute
It is transformer induced circuit to state sensor circuit, and secondary current is induced when there is electric leakage behavior generation；The detection circuit is responsible for
The electric leakage signal detected is transmitted to amplifying circuit by processing；The amplifying circuit, the electric leakage signal for will detect
It is amplified and is filtered；The control circuit includes reverse-blocking tetrode thyristor P1, is powered or disconnects by controlling reverse-blocking tetrode thyristor P1,
To realize the energization or power-off of circuit.
Specifically, as shown in Fig. 2, the Voltage stabilizing module includes one group of first zener diode D1 and second being serially connected
Zener diode D2；First zener diode and second zener diode are BZG05C3V3, and specified voltage stabilizing value is
3.3V.When high current occurs in mutual inductor secondary winding, first zener diode and second zener diode are in
Critical breakdown conditions, according to the principle of zener diode, although electric current changes in very large range at this time, diode both ends
Voltage can stablize near breakdown voltage, i.e. the specified voltage stabilizing value 3.3V of this zener diode（In this leakage protection circuit really
Constant voltage is 3.3V）.
The current limliting module includes one group of current-limiting resistance R52 being serially connected and fusing resistor R53.The current-limiting resistance
The resistance value of R52 is 39R, and the resistance value of the fusing resistor R53 is 0R.Specifically, the current-limiting resistance R52 and the fusing resistor
R53 series connection is circuit burnout component after high current inflow in order to prevent, and wherein current-limiting resistance R52's act as, in determination
Voltage conditions under（Determine that voltage is 3.3V in this leakage protection circuit）, make the current limit of circuit in preset range etc,
To protect circuit；Fusing resistor R53's act as, in first zener diode, second zener diode and institute
When stating current-limiting resistance R52 shielding failures, by the fusing of itself, makes to be formed between the sensor circuit and the detection circuit and open
Road, to achieve the purpose that protect component in circuit not destroyed.
The preferable specific implementation mode of the above, only the utility model, but the scope of protection of the utility model is not
Be confined to this, any people for being familiar with the technology is in the technical scope disclosed by the utility model, it is contemplated that variation or replace
It changes all to cover and be within the protection scope of the utility model.Therefore, the scope of protection of the utility model should be protected with claim
Subject to the range of shield.
Claims (6)
1. a kind of earth leakage protective device, which is characterized in that including be linked in sequence rectification circuit, sensor circuit, detection circuit, put
Big circuit and control circuit；It is in series with Voltage stabilizing module and current limliting mould respectively between the sensor circuit and the detection circuit
Block.
2. a kind of earth leakage protective device according to claim 1, which is characterized in that the Voltage stabilizing module includes being serially connected
The first zener diode（D1）With the second zener diode（D2）.
3. a kind of earth leakage protective device according to claim 2, which is characterized in that first zener diode and described
Second zener diode is BZG05C3V3, and specified voltage stabilizing value is 3.3V.
4. a kind of earth leakage protective device according to claim 1, which is characterized in that the current limliting module includes being serially connected
Current-limiting resistance（R52）And fusing resistor（R53）.
5. a kind of earth leakage protective device according to claim 4, which is characterized in that the current-limiting resistance（R52）Resistance value
For 39R, the fusing resistor（R53）Resistance value be 0R.
6. a kind of earth leakage protective device according to claim 1, which is characterized in that the control circuit includes silicon-controlled opens
It closes（P1）, it is used for the energization or disconnection of circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820129262.1U CN207705772U (en) | 2018-01-25 | 2018-01-25 | A kind of earth leakage protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820129262.1U CN207705772U (en) | 2018-01-25 | 2018-01-25 | A kind of earth leakage protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207705772U true CN207705772U (en) | 2018-08-07 |
Family
ID=63034348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820129262.1U Active CN207705772U (en) | 2018-01-25 | 2018-01-25 | A kind of earth leakage protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207705772U (en) |
-
2018
- 2018-01-25 CN CN201820129262.1U patent/CN207705772U/en active Active
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| GR01 | Patent grant |