CN214479597U - Starting current limiting circuit applicable to wide temperature range - Google Patents
Starting current limiting circuit applicable to wide temperature range Download PDFInfo
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- CN214479597U CN214479597U CN202120734755.XU CN202120734755U CN214479597U CN 214479597 U CN214479597 U CN 214479597U CN 202120734755 U CN202120734755 U CN 202120734755U CN 214479597 U CN214479597 U CN 214479597U
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Abstract
The utility model provides a starting current limiting circuit suitable for wide temperature range, this starting current limiting circuit adopts power resistor R1 to replace thermistor to go up the electric current limiting to adopt relay K1 bypass power resistor R1, adopt and connect by resistance R2, electric capacity C1, NPN switch triode Q1 and constitute delay switch circuit, be applicable to the great occasion of temperature variation scope, the defect problem of thermistor starting current limiting circuit unable normal use in the great occasion of temperature variation scope has been solved, it is obvious that the resistance reduces the current restriction when ambient temperature is high, can guarantee the normal start-up speed of equipment when ambient temperature is low.
Description
Technical Field
The utility model belongs to the technical field of electronic circuit, concretely relates to applicable starting current limiting circuit in wide temperature range.
Background
The input end of the power circuit of the aviation product is designed with a holding capacitor to ensure the characteristic requirement of the power supply, but at the moment of power-on, the charging current of the capacitor is greatly limited.
The traditional starting current limiting circuit is used for limiting the power-on current in a mode that a thermistor with a negative temperature coefficient is connected in series in a power supply loop, when equipment is powered on, the thermistor is at room temperature, the resistance value is large, the current is restrained from passing through, the current flows through the thermistor, the resistor heats, the temperature rises, the resistance value is rapidly reduced to a small value due to the temperature rise, and the normal work of a product is guaranteed. The existing circuit has the defect of incapability of being normally used in occasions with large temperature change ranges, the limitation of reducing the current by the resistance value is not obvious when the ambient temperature is high, and the starting speed of equipment with overlarge resistance value is low when the ambient temperature is low. There is therefore a need for improvements.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem: the utility model provides an applicable starting current limiting circuit in wide temperature range, the utility model is suitable for a temperature variation range's great occasion has solved thermistor starting current limiting circuit in the unable normal use's of the great occasion of temperature variation range defect problem, and the resistance reduces the current restriction when ambient temperature is high obviously, keeps stopping and guaranteeing equipment normal start-up speed when ambient temperature is low.
The utility model adopts the technical proposal that: the starting current limiting circuit applicable to a wide temperature range comprises a power resistor R1, a resistor R2, a capacitor C1, an NPN switching triode Q1 and a relay K1;
the input end of the power resistor R1 is connected with a power supply, the output end of the power resistor R1 is connected with a power circuit of an aviation product, and the power resistor R1 is used for electrifying and limiting current;
the relay K1 contact is connected with the power resistor R1 in parallel, and the relay K1 contact is used for bypassing the power resistor R1;
the resistor R2, the capacitor C1 and the NPN switching triode Q1 are connected to form a delay switch circuit, and the delay switch circuit is connected with a coil of the relay K1 in parallel.
In order to further limit the above technical solution, the specific circuit connections of the resistor R2, the capacitor C1 and the NPN switching transistor Q1 in the delay switch circuit are as follows: one end of the resistor R2 is connected with a power supply and one end of a coil of a relay K1, the other end of the resistor R2 is connected with one end of a capacitor C1, and the other end of the capacitor C1 is grounded; the base electrode of the NPN switching triode Q1 is connected with the connecting end of the resistor R2 and the capacitor C1, the collector electrode of the NPN switching triode Q1 is connected with the output end of the power resistor R1 and the other end of the coil of the relay K1, and the emitter electrode of the NPN switching triode Q1 is connected with the grounding end of the capacitor C1 and is grounded together.
The technical scheme is further limited, the device further comprises a diode D1, the diode D1 is connected with a coil of a relay K1 in parallel, the negative electrode of the diode D1 is connected with the input end of a power resistor R1, one end of the relay K1 and one end of a resistor R2, and the positive electrode of the diode D1 is connected with the output end of the power resistor R1, the other end of the relay K1 and the collector of an NPN switching triode Q1.
The utility model has the advantages compared with the prior art:
this scheme adopts power resistor R1 to replace thermistor to go up the electric current-limiting, and adopt relay K1 bypass power resistor R1, adopt and connect by resistance R2, electric capacity C1, NPN switch triode Q1 and form delay switch circuit, this starting current limiting circuit is applicable to the great occasion of temperature variation range, the defect problem that thermistor starting current limiting circuit can't normally be used in the great occasion of temperature variation range has been solved, the resistance reduces the current restriction obvious when ambient temperature is high, can guarantee the normal start-up speed of equipment when ambient temperature is low.
Drawings
Fig. 1 is a schematic 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.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements" does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.
Please refer to fig. 1, which illustrates an embodiment of the present invention.
The starting current limiting circuit applicable to a wide temperature range is shown in fig. 1 and comprises a power resistor R1, a resistor R2, a capacitor C1, an NPN switching triode Q1 and a relay K1;
the input end of the power resistor R1 is connected with a power supply, the output end of the power resistor R1 is connected with a power circuit of an aviation product, and the power resistor R1 is used for replacing a thermistor to carry out power-on current limiting;
the relay K1 contact is connected with the power resistor R1 in parallel, and the relay K1 contact is used for bypassing the power resistor R1;
the resistor R2, the capacitor C1 and the NPN switching triode Q1 are connected to form a delay switch circuit, and the delay switch circuit is connected with the power resistor R1 in parallel. Specifically, the specific circuit connections of the resistor R2, the capacitor C1 and the NPN switching transistor Q1 in the delay switch circuit are as follows: one end of the resistor R2 is connected with a power supply and one end of a coil of a relay K1, the other end of the resistor R2 is connected with one end of a capacitor C1, and the other end of the capacitor C1 is grounded; the base electrode of the NPN switching triode Q1 is connected with the connecting end of the resistor R2 and the capacitor C1, the collector electrode of the NPN switching triode Q1 is connected with the output end of the power resistor R1 and the other end of the coil of the relay K1, and the emitter electrode of the NPN switching triode Q1 is connected with the grounding end of the capacitor C1 and is grounded together.
In a further illustration, the circuit further comprises a diode D1, and the diode D1 is connected in parallel with the coil of the relay K1 and is used for restraining a spike voltage circuit. Specifically, the cathode of the diode D1 is connected to one end of the relay K1 and one end of the resistor R2, and the anode of the diode D1 is connected to the other end of the relay K1 and the collector of the NPN switching transistor Q1.
The utility model discloses an application principle:
after the equipment is powered on, an NPN switching triode Q1 is in a forbidden state, a relay K1 is not attracted, the equipment supplies power through a power resistor R1, and the power resistor R1 plays a role in limiting current;
the power supply charges a capacitor C1 through a resistor R2, when the voltage of the capacitor C1 exceeds the conducting voltage of an NPN switching triode Q1, the NPN switching triode Q1 is conducted, a relay K1 is attracted, a power resistor R1 is bypassed, and the equipment starting current limiting is completed.
The utility model discloses a power resistor R1 replaces thermistor to go up the electric current-limiting, and adopt relay K1 bypass power resistor R1, the adoption is by resistance R2, electric capacity C1, NPN switch triode Q1 connects and constitutes delay switch circuit, be applicable to the great occasion of temperature variation scope, the defect problem of the unable normal use of thermistor starting current limiting circuit in the great occasion of temperature variation scope has been solved, the resistance reduces the electric current restriction when ambient temperature is high obviously, can guarantee the normal start-up speed of equipment when ambient temperature is low.
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 (3)
1. Applicable starting current limiting circuit in wide temperature range, its characterized in that: the power supply comprises a power resistor R1, a resistor R2, a capacitor C1, an NPN switching triode Q1 and a relay K1;
the input end of the power resistor R1 is connected with a power supply, the output end of the power resistor R1 is connected with a power circuit of an aviation product, and the power resistor R1 is used for electrifying and limiting current;
the relay K1 contact is connected with the power resistor R1 in parallel, and the relay K1 contact is used for bypassing the power resistor R1;
the resistor R2, the capacitor C1 and the NPN switching triode Q1 are connected to form a delay switch circuit, and the delay switch circuit is connected with a relay K1 wire package.
2. The startup current limiting circuit applicable to a wide temperature range according to claim 1, wherein: the specific circuit connection of the resistor R2, the capacitor C1 and the NPN switching triode Q1 in the time delay switch circuit is as follows: one end of the resistor R2 is connected with a power supply and one end of a coil of a relay K1, the other end of the resistor R2 is connected with one end of a capacitor C1, and the other end of the capacitor C1 is grounded; the base electrode of the NPN switching triode Q1 is connected with the connecting end of the resistor R2 and the capacitor C1, the collector electrode of the NPN switching triode Q1 is connected with the output end of the power resistor R1 and the other end of the coil of the relay K1, and the emitter electrode of the NPN switching triode Q1 is connected with the grounding end of the capacitor C1 and is grounded together.
3. The startup current limiting circuit applicable to a wide temperature range according to claim 2, wherein: still include a diode D1, diode D1 and relay K1 solenoid parallel connection, diode D1's negative pole and power resistor R1's input, relay K1 solenoid one end and resistance R2 one end are connected, diode D1's positive pole and power resistor R1's output, relay K1 solenoid other end and NPN switch triode Q1's collecting electrode are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120734755.XU CN214479597U (en) | 2021-04-11 | 2021-04-11 | Starting current limiting circuit applicable to wide temperature range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120734755.XU CN214479597U (en) | 2021-04-11 | 2021-04-11 | Starting current limiting circuit applicable to wide temperature range |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214479597U true CN214479597U (en) | 2021-10-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120734755.XU Expired - Fee Related CN214479597U (en) | 2021-04-11 | 2021-04-11 | Starting current limiting circuit applicable to wide temperature range |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214479597U (en) |
-
2021
- 2021-04-11 CN CN202120734755.XU patent/CN214479597U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211022 |