CN213585128U - Overcurrent detection protection circuit - Google Patents
Overcurrent detection protection circuit Download PDFInfo
- Publication number
- CN213585128U CN213585128U CN202022475418.1U CN202022475418U CN213585128U CN 213585128 U CN213585128 U CN 213585128U CN 202022475418 U CN202022475418 U CN 202022475418U CN 213585128 U CN213585128 U CN 213585128U
- Authority
- CN
- China
- Prior art keywords
- resistor
- comparator
- diode
- protection circuit
- overcurrent detection
- 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
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses an overcurrent detection protection circuit, including three-terminal adjustable reference source V1, comparator U1, current transformer J1 and resistance R2, current transformer J1 gathers one end connecting resistance R2 and comparator U1's foot 6 behind the current signal, current transformer J1's other end connecting resistance R2 and ground, comparator U1's foot 7 connecting resistance R4 and diode D1's negative pole, diode D1's positive pole of diode D2 is connected to diode D1's positive pole, diode D2's negative pole connecting resistance R1, resistance R7 and comparator U1's foot 1. The utility model discloses overcurrent detection protection circuit adopts hall sensor to carry out current signal's collection to utilize voltage comparator to carry out current signal's comparative processing, reach signal detection's purpose, the signal that detects output can connect elements such as relay, electronic switch, alarm and carry out safety protection.
Description
Technical Field
The utility model relates to a detect technical field, specifically an overcurrent detection protection circuit.
Background
The overcurrent exceeds the current rating. Loop currents greater than the nominal current carrying capacity of the loop conductor are all over-currents. It includes overload and short circuit currents. The distinction is that the overcurrent before the loop insulation is damaged is called overload current; the overcurrent after insulation breakdown is called short-circuit current.
Short circuit can cause damage to electric equipment, and serious consequences such as electric shock accidents and fire disasters can be caused, so that detection and protection of overcurrent are particularly important.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an overcurrent detection protection circuit to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
an overcurrent detection protection circuit comprises a three-terminal adjustable reference source V1, a comparator U1, a current transformer J1 and a resistor R2, wherein one end of the current transformer J1 is connected with a resistor R2 and a pin 6 of a comparator U1 after current signals are collected, the other end of the current transformer J1 is connected with the other end of a resistor R2 and the ground, a pin 7 of the comparator U1 is connected with a resistor R4 and the cathode of a diode D1, the anode of the diode D1 is connected with the anode of a diode D1, the cathode of the diode D1 is connected with a resistor R1, a resistor R1 and a pin 1 of the comparator U1, the other end of the resistor R1 is connected with a resistor R1, one fixed end of a potentiometer RW1, the resistor R1 and the cathode of the three-terminal adjustable reference source V1, the control electrode of the three-terminal adjustable reference source V1 is connected with the terminal of the potentiometer RW1, the anode of the three-terminal adjustable reference source V1 is connected with the other end of the potentiometer V1 and the ground, and, the other end of the resistor R6 is connected to the other end of the voltmeter V and the ground, and the other end of the resistor R7 is connected to the output end OUT and the capacitor C1.
As a further technical solution of the present invention: and the output end OUT is connected with a relay, an electronic switch, an alarm or a controller.
As a further technical solution of the present invention: the model of the comparator U1 is LM 339.
As a further technical solution of the present invention: the model of the three-end adjustable reference source V1 is TL 431.
As a further technical solution of the present invention: the voltage detection terminal PA1 is connected with a voltmeter or a controller.
As a further technical solution of the present invention: the resistance values of the resistor R5 and the resistor R6 are the same.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses overcurrent detection protection circuit adopts hall sensor to carry out current signal's collection to utilize voltage comparator to carry out current signal's comparative processing, reach signal detection's purpose, the signal that detects output can connect elements such as relay, electronic switch, alarm and carry out safety protection.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, an overcurrent detection protection circuit includes a three-terminal adjustable reference source V1, a comparator U1, a current transformer J1 and a resistor R2, where after a current signal is collected by the current transformer J1, one terminal of the current transformer J1 is connected to a resistor R2 and a pin 6 of the comparator U1, the other terminal of the current transformer J1 is connected to the other terminal of the resistor R2 and ground, a pin 7 of the comparator U1 is connected to a resistor R4 and a cathode of a diode D1, an anode of the diode D1 is connected to an anode of a diode D1, a cathode of the diode D1 is connected to a resistor R1, a resistor R1 and a pin 1 of the comparator U1, the other terminal of the resistor R1 is connected to a fixed terminal of the potentiometer R1, a resistor R1 and a cathode of the adjustable reference source V1, a control electrode of the three-terminal adjustable reference source V1 is connected to a sliding terminal of the potentiometer RW1, an adjustable anode of the three-terminal source V1 is connected to the other terminal of the potentiometer R36, the other end of the resistor R6 is connected to the other end of the voltmeter V and the ground, and the other end of the resistor R7 is connected to the output end OUT and the capacitor C1.
After the resonant current sampled by the current transformer J1 is converted into voltage through the sampling resistor R2, the voltage is compared with the set safety current, when the voltage exceeds the limit, the output level of the comparator U1 changes, a high-level signal is output, and elements such as a relay, an electronic switch and an alarm connected to the output end OUT respond to perform safety protection.
In the figure, a three-terminal adjustable reference source TL431 is used for setting a protection voltage through a voltage stabilizing and adjusting device, and a voltmeter is connected after voltage division is carried out through R5 and R6 to be used as calibration of a reference voltage. On one hand, the system can know the current set value of the protection current in real time, on the other hand, the set value of the protection current is compared with the resonance current sampled by J1 in real time through U1, and the OUT voltage of the output end rises during overcurrent so as to trigger protection.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. An overcurrent detection protection circuit comprises a three-terminal adjustable reference source V1, a comparator U1, a current transformer J1 and a resistor R2, and is characterized in that one end of the current transformer J1 is connected with a resistor R2 and a pin 6 of a comparator U1 after current signals are collected, the other end of the current transformer J1 is connected with the other end of a resistor R2 and the ground, a pin 7 of the comparator U1 is connected with a resistor R4 and the cathode of a diode D1, the anode of a diode D1 is connected with the anode of a diode D1, the cathode of the diode D1 is connected with a resistor R1, a resistor R1 and a pin 1 of the comparator U1, the other end of the resistor R1 is connected with a resistor R1, one fixed end of a potentiometer RW1, a resistor R1 and the cathode of an adjustable reference source V1, the control electrode of the three-terminal adjustable reference source V1 is connected with the sliding end of the potentiometer RW1, the anode of the three-terminal adjustable reference source V1 is connected with the other end of the potentiometer R1 and the ground, and the resistor, the other end of the resistor R6 is connected to the other end of the voltmeter V and the ground, and the other end of the resistor R7 is connected to the output end OUT and the capacitor C1.
2. The overcurrent detection protection circuit as recited in claim 1, wherein the output OUT is connected to a relay, an electronic switch, an alarm or a controller.
3. The overcurrent detection protection circuit as claimed in claim 1, wherein the comparator U1 is of type LM 339.
4. The overcurrent detection protection circuit as recited in claim 1, wherein the three-terminal adjustable reference source V1 is model TL 431.
5. The over-current detection protection circuit as claimed in claim 4, wherein the resistances of the resistor R5 and the resistor R6 are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022475418.1U CN213585128U (en) | 2020-10-31 | 2020-10-31 | Overcurrent detection protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022475418.1U CN213585128U (en) | 2020-10-31 | 2020-10-31 | Overcurrent detection protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213585128U true CN213585128U (en) | 2021-06-29 |
Family
ID=76531596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022475418.1U Active CN213585128U (en) | 2020-10-31 | 2020-10-31 | Overcurrent detection protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213585128U (en) |
-
2020
- 2020-10-31 CN CN202022475418.1U patent/CN213585128U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104348141A (en) | Overcurrent and overvoltage protection circuit and method for electronic cigarette | |
| CN102709901A (en) | Overvoltage protection method and device of current transformer | |
| CN201345530Y (en) | Current foldback circuit | |
| CN213585128U (en) | Overcurrent detection protection circuit | |
| CN102290689B (en) | Earth leakage protection plug | |
| CN209016688U (en) | A kind of intelligence overcurrent protective device | |
| CN2453568Y (en) | Electric power supply plug for preventing it from being leakage, over-voltage, over-load, short circuit and lightninhg-stroke | |
| CN204886903U (en) | IGBT current foldback circuit | |
| CN204651904U (en) | The protective circuit of power supply unit | |
| CN202363890U (en) | Power protector for transmission line fault monitoring terminal | |
| CN111157797A (en) | Insulation detection circuit and energy storage charging equipment | |
| CN203278367U (en) | Large power battery charging device capable of preventing reverse battery | |
| CN215378425U (en) | Intelligent direct current power supply system | |
| CN216670238U (en) | Fill electric pile earth connection broken string detection device | |
| CN212258401U (en) | Overvoltage protection circuit for storage battery | |
| CN205123231U (en) | High -temperature early warning surge protector | |
| CN212031664U (en) | Over-current protection current and delay time detection device for lithium battery protection circuit board | |
| CN204030548U (en) | A kind of short-circuit protection circuit of frequency changer direct current bus | |
| CN113625100B (en) | Method for detecting voltage loss of user terminal | |
| CN203595772U (en) | Inverter short circuit overload detection circuit and vehicle inverter | |
| CN215813279U (en) | Ground fault detection circuit and power supply circuit | |
| CN205487997U (en) | Circuit breaker of maloperation after prevention short circuit | |
| CN209767142U (en) | Overvoltage protection device used in circuit | |
| CN109752583A (en) | A kind of isolated DC current detection circuit with prime protection | |
| CN220172838U (en) | Overcurrent protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |