CN210224951U - Circuit capable of limiting current to increase rapidly - Google Patents
Circuit capable of limiting current to increase rapidly Download PDFInfo
- Publication number
- CN210224951U CN210224951U CN201921255922.1U CN201921255922U CN210224951U CN 210224951 U CN210224951 U CN 210224951U CN 201921255922 U CN201921255922 U CN 201921255922U CN 210224951 U CN210224951 U CN 210224951U
- Authority
- CN
- China
- Prior art keywords
- switch
- circuit
- resistor
- diode
- power supply
- 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
Abstract
The utility model discloses a circuit capable of limiting the rapid increase of current, which comprises an LD circuit formed by connecting an inductor L and a diode D in parallel, wherein the input end of the LD circuit is connected with a power VCC of positive current input, and the power VCC is connected with the negative pole of the diode D; diode D's negative pole termination switch circuit's input, switch circuit's output termination power supply negative pole end or earthing terminal, the utility model discloses utilize the LD circuit to play the effect of limiting current sudden change, make the product reduce and create the time and carry out protection control and improve electromagnetic interference's effect for control unit to the requirement of switch semiconductor part.
Description
Technical Field
The utility model belongs to the technical field of the circuit composition and specifically relates to a circuit that can the limiting current increase rapidly is related to.
Background
When the load works normally, the current can quickly reach the negative side or the ground side of the power supply from the positive side of the power supply through the switch circuit, and the abnormal increase of the current can cause the load damage or the semiconductor parts burn due to the sudden change of the current in the process; when the load is abnormal, for example, when the load is short-circuited, the current in the circuit suddenly changes, and at the moment, the requirement of the product on the switching semiconductor part is high, and the actual product cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an it is not enough to overcome above-mentioned condition, aims at providing the technical scheme that can solve above-mentioned problem.
A circuit capable of limiting current to increase rapidly comprises an LD circuit formed by connecting an inductor L and a diode D in parallel, wherein the input end of the LD circuit is connected with a power supply VCC with positive current input, and the power supply VCC is connected with the negative electrode of the diode D; the negative electrode of the diode D is connected with the input end of the switching circuit, and the output end of the switching circuit is connected with the negative electrode end or the grounding end of the power supply;
the switching circuit is composed of a single switching circuit or a multi-switching circuit.
As a further aspect of the present invention: the single switch circuit is composed of a single switch K and a resistor R, the switch K and the resistor R are in a series connection structure, and the negative pole end of the diode D is connected with the switch K; the resistor R is connected with the negative electrode end of the power supply or the grounding end.
As a further aspect of the present invention: the multi-switch circuit is composed of a switch K1, a switch K11, a switch K2, a switch K22, a switch K3, a switch K33 …, a switch Kn, a switch Knn, a resistor R1, a resistor R2, a resistor R3 … and a resistor Rn, wherein the switch K1, the switch K11 and the resistor R1 are sequentially connected in series; the switch K2, the switch K22 and the resistor R2 are sequentially connected in series; the switch K3, the switch K33 and the resistor R3 are sequentially connected in series; the switch Kn, the switch Knn and the resistor Rn are sequentially connected in series; the switch K1, the switch K2, the switch K3 … and the switch Kn are connected in parallel and are connected with the negative electrode end of the diode D; the resistor R1, the resistor R2, the resistor R3 … and the resistor Rn are all connected with the negative electrode end of the power supply or the ground end.
As a further aspect of the present invention: and a load RL is connected between the power supply VCC and the LD circuit in series or a load M is connected in the multi-switch circuit in parallel.
The utility model has the advantages that: the utility model discloses utilize the LD circuit to play the effect of limiting current sudden change, make the product reduce the requirement of switch semiconductor part and create the effect that the time carries out protection control and improvement electromagnetic interference for control unit.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a first schematic structural diagram of the present invention.
Fig. 2 is a schematic structural 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. 1-2, in an embodiment of the present invention, a circuit capable of limiting a current to increase rapidly includes an LD circuit formed by connecting an inductor L and a diode D in parallel, an input terminal of the LD circuit is connected to a power VCC for inputting a positive current, wherein the power VCC is connected to a negative electrode of the diode D; the negative electrode of the diode D is connected with the input end of the switching circuit, and the output end of the switching circuit is connected with the negative electrode end or the grounding end of the power supply;
the switch circuit is composed of a single switch circuit or a plurality of switch circuits;
the single switch circuit is composed of a single switch K and a resistor R, the switch K and the resistor R are in a series connection structure, and the negative pole end of the diode D is connected with the switch K; the resistor R is connected with the negative electrode end or the grounding end of the power supply;
the multi-switch circuit is composed of a switch K1, a switch K11, a switch K2, a switch K22, a switch K3, a switch K33 …, a switch Kn, a switch Knn, a resistor R1, a resistor R2, a resistor R3 … and a resistor Rn, wherein the switch K1, the switch K11 and the resistor R1 are sequentially connected in series; the switch K2, the switch K22 and the resistor R2 are sequentially connected in series; the switch K3, the switch K33 and the resistor R3 are sequentially connected in series; the switch Kn, the switch Knn and the resistor Rn are sequentially connected in series; the switch K1, the switch K2, the switch K3 … and the switch Kn are connected in parallel and are connected with the negative electrode end of the diode D; the resistor R1, the resistor R2, the resistor R3 … and the resistor Rn are all connected with the negative electrode end of the power supply or the ground end.
And a load RL is connected between the power supply VCC and the LD circuit in series or a load M is connected in the multi-switch circuit in parallel.
The utility model discloses a theory of operation is: when the load works normally, when the switch circuit is switched on, the current of the LD circuit can quickly reach the negative side or the ground side of the power supply through the inductor L and the switch circuit, and the current can be gradually increased because the sudden change of the current can be limited by the action of the inductor L; when the switching circuit is turned off, the inductor L can generate back electromotive force to be released back to the positive power supply through the diode D, also because the inductor L limits the sudden change of current. When the load is abnormal, such as short circuit, due to the existence of the LD circuit, when the switch circuit is switched on, the voltage between the resistor R and the switch K can be gradually increased, whether the voltage between the resistor R and the switch K is abnormal or not is detected by the control component in the rising time, the control can be carried out in the rising time, the LD circuit plays a role in limiting current mutation, the requirement of a product on a switch semiconductor part is reduced, and the time is created to carry out protection control on the control component and improve the electromagnetic interference.
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.
Claims (4)
1. A circuit capable of limiting current to increase rapidly is characterized by comprising an LD circuit formed by connecting an inductor L and a diode D in parallel, wherein the input end of the LD circuit is connected with a power supply VCC with positive current input, and the power supply VCC is connected with the negative electrode of the diode D; the negative electrode of the diode D is connected with the input end of the switching circuit, and the output end of the switching circuit is connected with the negative electrode end or the grounding end of the power supply;
the switching circuit is composed of a single switching circuit or a multi-switching circuit.
2. The circuit capable of limiting the rapid increase of current according to claim 1, wherein the single switch circuit comprises a single switch K and a resistor R, the switch K and the resistor R are connected in series, and the negative terminal of the diode D is connected to the switch K; the resistor R is connected with the negative electrode end of the power supply or the grounding end.
3. The circuit capable of limiting the rapid increase of current according to claim 1, wherein the multi-switch circuit is composed of a switch K1, a switch K11, a switch K2, a switch K22, a switch K3, a switch K33 …, a switch Kn, a switch Knn, a resistor R1, a resistor R2, a resistor R3 … and a resistor Rn, wherein the switch K1, the switch K11 and the resistor R1 are connected in series in sequence; the switch K2, the switch K22 and the resistor R2 are sequentially connected in series; the switch K3, the switch K33 and the resistor R3 are sequentially connected in series; the switch Kn, the switch Knn and the resistor Rn are sequentially connected in series; the switch K1, the switch K2, the switch K3 … and the switch Kn are connected in parallel and are connected with the negative electrode end of the diode D; the resistor R1, the resistor R2, the resistor R3 … and the resistor Rn are all connected with the negative electrode end of the power supply or the ground end.
4. The circuit of claim 1, wherein a load RL is connected in series between the power source VCC and the LD circuit or a load M is connected in parallel in the multi-switch circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921255922.1U CN210224951U (en) | 2019-08-05 | 2019-08-05 | Circuit capable of limiting current to increase rapidly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921255922.1U CN210224951U (en) | 2019-08-05 | 2019-08-05 | Circuit capable of limiting current to increase rapidly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210224951U true CN210224951U (en) | 2020-03-31 |
Family
ID=69919235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921255922.1U Active CN210224951U (en) | 2019-08-05 | 2019-08-05 | Circuit capable of limiting current to increase rapidly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210224951U (en) |
-
2019
- 2019-08-05 CN CN201921255922.1U patent/CN210224951U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102842886A (en) | Overvoltage protection circuit | |
| CN203553913U (en) | Main controller overvoltage protection circuit and large-screen splicing system | |
| CN210224951U (en) | Circuit capable of limiting current to increase rapidly | |
| CN204967263U (en) | Buffer circuit and dual power supply system | |
| CN201860094U (en) | Short circuit protection circuit for switch power | |
| CN204103881U (en) | A kind of circuit realizing mains switch based on matrix press-key | |
| CN217469748U (en) | Driving circuit capable of changing output power supply polarity | |
| CN201039316Y (en) | A reset circuit and TV set with above reset circuit | |
| CN212462761U (en) | Dual short-circuit protection circuit | |
| CN102013664B (en) | Protection device for transformer | |
| CN201877776U (en) | Overflow overload short-circuit protection circuit | |
| CN205016987U (en) | BMS activates circuit | |
| CN212304746U (en) | Reverse connection prevention protection circuit | |
| CN205141990U (en) | Soft start power controller | |
| CN105305397A (en) | Overvoltage protection circuit and electronic equipment | |
| CN204068673U (en) | A kind of high reliability middle low power drive unit | |
| CN206498183U (en) | A kind of over-and under-voltage protection circuit | |
| CN202797863U (en) | Time sequence protection circuit of electronic product | |
| CN201007991Y (en) | Short circuit, overload safeguard for transistor output | |
| CN205595781U (en) | Arc control device | |
| CN206250742U (en) | A kind of output short circuit protection circuit | |
| CN204557118U (en) | A kind of air conditioner and Intelligent Power Module power-on protective circuit thereof | |
| CN214100844U (en) | Direct current load short circuit protection circuit | |
| CN111865274B8 (en) | Comparator circuit | |
| CN204928112U (en) | Direct current surge suppression circuit and DC power supply power supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |