CN213072439U - Power wrong wiring protection circuit - Google Patents
Power wrong wiring protection circuit Download PDFInfo
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- CN213072439U CN213072439U CN202022032372.6U CN202022032372U CN213072439U CN 213072439 U CN213072439 U CN 213072439U CN 202022032372 U CN202022032372 U CN 202022032372U CN 213072439 U CN213072439 U CN 213072439U
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Abstract
The embodiment of the utility model discloses power wrong wiring protection circuit, include: the power supply connecting circuit is used for connecting an external power supply and comprises an anode connecting end, a cathode connecting end, a thermistor and a bidirectional transient diode; the first bidirectional transient diode is connected with the anode connecting end and the cathode connecting end and is used for clamping; the thermistor is connected between the anode connecting end and the bidirectional transient diode in series; a DC circuit connection end; and the first filter circuit is arranged between the power supply connecting circuit and the direct current circuit connecting end. The utility model discloses can play the guard action when exchanging 220V's high pressure and inserting the power supply circuit of line loss module, the line loss module can resume normal work after waiting the high-pressure alternating current signal that the mistake was inserted removes.
Description
Technical Field
The embodiment of the utility model provides a circuit field, concretely relates to power wrong wiring protection circuit.
Background
The line loss module is a key component in distribution network automation core equipment (FTU and DTU), bears the electric energy metering task of relevant lines, and has the following functions:
measuring three-phase voltage, three-phase current, total active power, total reactive power, active and reactive power of each phase, system frequency and the like; four-quadrant electric energy metering;
the electric quantity freezing function comprises timing freezing, instantaneous freezing, daily freezing, integral freezing and examination daily freezing;
the RTC with the temperature compensation is arranged in the RTC, and the daily timing accuracy is better than 0.5 s/day in the full-temperature working range;
the method supports a DL/T634.5101-2002 communication protocol, and supports the functions of balanced and unbalanced mode switching, power resolution adjustment (the decimal number can be set), total calling power, burst uploading of freezing quantity, telemetering change uploading, telemetry deflection (TCOS) uploading and the like.
The line loss module is supplied with power by adopting wide voltage, supports DC18-56V self-adaptation, and the system can maintain basic functions of measurement, metering and the like for more than 5s after power failure, thereby avoiding the influence of power supply flash on the sampling work continuity of the module. Because the line loss module is installed in FTU or DTU equipment, the structural design is very compact, all power supplies, communication and voltage and current sampling input signals are realized by adopting standard connectors with 5.08 intervals, if the training of a wiring operator is not in place during wiring, the situation that the high-voltage sampling signals are connected into a power supply circuit easily occurs, the highest high-voltage sampling signals are alternating current 220V, once a wrong line is connected, the power supply circuit of the line loss module is burnt, the permanent damage of the equipment is caused, the currently common solution is to strengthen the training of field operators, the ratio of the wrong line is reduced as much as possible, but the situation of the wrong line cannot be completely avoided.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a power wrong wiring protection circuit for solve current line loss module and connect the easy burning that the wrong line leads to supply circuit, cause the problem of the permanent damage of equipment.
In order to achieve the above object, the embodiment of the present invention mainly provides the following technical solutions:
the embodiment of the utility model provides a power wrong wiring protection circuit, include: the power supply connecting circuit is used for connecting an external power supply and comprises an anode connecting end, a cathode connecting end, a thermistor and a first bidirectional transient diode; the first bidirectional transient diode is connected with the anode connecting end and the cathode connecting end and is used for clamping; the thermistor is connected between the positive electrode connecting end and the first bidirectional transient diode in series; a DC circuit connection end; and the first filter circuit is arranged between the power supply connecting circuit and the direct current circuit connecting end.
According to an embodiment of the present invention, the first filter circuit includes a diode, a first resistor, an inductor, and a first capacitor; the anode of the diode is connected with the anode connecting end through the thermistor, and the cathode of the diode is connected with the direct current circuit connecting end through the first resistor; one end of the first capacitor is connected with a node between the first resistor and the direct current circuit connecting end, and the other end of the first capacitor is connected with the negative electrode connecting end; the inductor is connected in parallel with the first resistor.
According to the utility model discloses an embodiment still includes: a second bi-directional transient diode for clamping the DC circuit connection terminal.
According to the utility model discloses an embodiment still includes: and a second capacitor connected between the positive terminal of the connection terminal to the DC circuit and a ground terminal.
According to one embodiment of the present invention, the thermistor is model MZ11-08A100-200 RM.
According to an embodiment of the present invention, the first bi-directional transient diode is of type P6KE75 CA.
According to an embodiment of the invention, the clamping voltage of the second bi-directional transient diode is 70V.
According to an embodiment of the invention, the capacitance of the second capacitor is 0.1 uF.
The embodiment of the utility model provides a technical scheme has following advantage at least:
the embodiment of the utility model provides a power wrong wiring protection circuit can avoid the damage of equipment when the low pressure direct current power supply line of line loss module is inserted to high-pressure commercial power, and the wrong wiring resumes normal back equipment and can resume normal work.
Drawings
Fig. 1 is a circuit diagram of a power miswiring protection circuit according to an embodiment of the present invention.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, interfaces, techniques, etc. in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., directly or indirectly through intervening media. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The utility model provides a discovery after the people carries out a large amount of creative work to the maximum voltage of normal supply voltage scope of loss module and voltage sampling input line number: the normal power supply voltage range required by the standard of the line loss module is DC18-56V, the highest voltage of the voltage sampling input line number is AC220V, and the designed working voltage range of the working power supply of the line loss module is 16V-75V.
Based on the above knowledge, the present invention has been proposed.
Fig. 1 is a circuit diagram of a power miswiring protection circuit according to an embodiment of the present invention. As shown in fig. 1, the utility model discloses power wrong wiring protection circuit of embodiment includes: the power supply connecting circuit, the direct current circuit connecting end and the first filter circuit are used for filtering high-frequency interference on a line.
The power supply connection circuit comprises an anode connection end V +, a cathode connection end V-, a thermistor RT1 and a first bidirectional transient diode VD 1.
When the power supply input is normally connected, the input voltage range between the V + and the negative connection end V-is 18-72V.
The first bidirectional transient diode VD1 is connected with the positive electrode connecting end V + and the negative electrode connecting end V-for clamping. In one embodiment of the present invention, the first bi-directional transient diode has a model number P6KE75CA, a peak bleed power of 600W; the clamping voltage is 71.30V-78.80V, and the average clamping voltage of 103V at the maximum peak current is 75V; maximum peak current 5.9A, operating and storage temperature range: -55-150 ℃.
The thermistor RT1 is connected in series between the positive connection terminal and the first bi-directional transient diode. In an embodiment of the present invention, the thermistor has a model MZ11-08a100-200RM, a resistance value of 10-20 Ω at normal temperature, no operating current of 100MA, maximum withstand voltage of 400V, and normal operating temperature: -25-80 ℃.
When the power supply is input into a normal wiring, the range of input voltage is 18-72V, in the normal working range of the power supply, the power consumption current of a rear-stage power supply is within 50MA, the current is lower than the action current of a thermistor RT1, the resistance value of the thermistor is 10-20 ohm, the power supply works normally, when the wiring is wrong, the input voltage can reach AC220V at most, because the rear end of the thermistor is connected with the negative electrode of the power supply in parallel with a TVS tube VD1, the clamping voltage of the VD1 is 75V, the input voltage is added to two ends of the TVS tube after passing through the thermistor, the TVS tube is conducted instantly, the voltage of the two ends is clamped at about 75, at the moment, the current flowing through the thermistor RT1 and the TVS tube is (220-75) V/10 ohm-3.5A (the current is lower than the maximum current allowed by the TVS tube), because the current is far higher than the non-action current of the thermistor, the thermistor 1 self-rises 3-4 orders of resistance value in a, the whole loop enters an open circuit state, the voltage of 220V is basically and completely applied to two ends of the thermistor, the thermistor cannot be damaged due to the fact that the voltage withstanding value of the thermistor is higher than 400V, the highest input voltage of a rear-stage circuit is about 75V due to the clamping effect of the TVS before the loop is cut off by the thermistor, the rear-stage circuit is well protected, and the circuit cannot be damaged even if the 220V high voltage is continuously applied to the circuit for a long time; when the wrong external connection is corrected, the current of the thermistor is reduced, the temperature is recovered to be normal, the resistance value is recovered to be the original state, and the circuit is recovered to work normally.
The most critical devices of the protection circuit are a PTC thermistor and a high-power TVS tube, index parameter matching between the PTC thermistor and the TVS tube is very critical, the protection circuit not only can play a role in protecting the circuit, but also can not be damaged under the working condition of continuous high voltage.
In an embodiment of the present invention, the first filter circuit includes a diode D, a first resistor R1, an inductor L1, and a first capacitor C1.
The anode of the diode D is connected with the anode connecting end V + through a thermistor RT1, and the cathode of the diode D is connected with the direct-current circuit connecting end VSR through a first resistor R1. The diode D is used to achieve unidirectional conduction.
One end of the first capacitor C1 is connected to a node between the first resistor R1 and the dc circuit connection terminal VSR, and the other end of the first capacitor C1 is connected to the negative connection terminal V-. The inductor is connected in parallel with the first resistor.
In an embodiment of the present invention, the source miswiring protection circuit further includes: and the second bidirectional transient diode VD2 is used for clamping the connection end of the direct current circuit, and the second bidirectional transient diode VD2 is a bidirectional TVS tube with the clamping voltage of 70V and is used for clamping the short-time surge voltage.
In an embodiment of the present invention, the power miswiring protection circuit further includes: and a second capacitor C2 connected between the positive electrode of the connection end of the direct current circuit and the ground end, wherein the capacitance of the second capacitor is 0.1 uF.
In addition, other configurations and functions of the power miswiring protection circuit according to the embodiment of the present invention are known to those skilled in the art, and are not described in detail for reducing redundancy.
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above-mentioned only are embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.
Claims (8)
1. A power miswiring protection circuit, comprising:
the power supply connecting circuit is used for connecting an external power supply and comprises an anode connecting end, a cathode connecting end, a thermistor and a first bidirectional transient diode; the first bidirectional transient diode is connected with the anode connecting end and the cathode connecting end and is used for clamping; the thermistor is connected between the positive electrode connecting end and the first bidirectional transient diode in series;
a DC circuit connection end;
and the first filter circuit is arranged between the power supply connecting circuit and the direct current circuit connecting end.
2. The power miswiring protection circuit of claim 1, wherein the first filter circuit comprises a diode, a first resistor, an inductor, and a first capacitor;
the anode of the diode is connected with the anode connecting end through the thermistor, and the cathode of the diode is connected with the direct current circuit connecting end through the first resistor;
one end of the first capacitor is connected with a node between the first resistor and the direct current circuit connecting end, and the other end of the first capacitor is connected with the negative electrode connecting end;
the inductor is connected in parallel with the first resistor.
3. The power miswire protection circuit of claim 1, further comprising:
a second bi-directional transient diode for clamping the DC circuit connection terminal.
4. The power miswire protection circuit of claim 1, further comprising:
and a second capacitor connected between the positive terminal of the connection terminal to the DC circuit and a ground terminal.
5. The circuit of claim 1, wherein the thermistor is of the type MZ11-08a100-200 RM.
6. The miswire protection circuit of claim 1, wherein the first bi-directional transient diode is of type P6KE75 CA.
7. The miswire power supply protection circuit of claim 3, wherein the clamping voltage of the second bi-directional transient diode is 70V.
8. The power miswiring protection circuit of claim 4, wherein the second capacitor has a capacitance of 0.1 uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022032372.6U CN213072439U (en) | 2020-09-16 | 2020-09-16 | Power wrong wiring protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022032372.6U CN213072439U (en) | 2020-09-16 | 2020-09-16 | Power wrong wiring protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN213072439U true CN213072439U (en) | 2021-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022032372.6U Active CN213072439U (en) | 2020-09-16 | 2020-09-16 | Power wrong wiring protection circuit |
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| CN (1) | CN213072439U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112134452A (en) * | 2020-09-16 | 2020-12-25 | 北京五力泰科技有限公司 | Power wrong wiring protection circuit |
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2020
- 2020-09-16 CN CN202022032372.6U patent/CN213072439U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112134452A (en) * | 2020-09-16 | 2020-12-25 | 北京五力泰科技有限公司 | Power wrong wiring protection circuit |
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