CN214154003U - Inverter protection circuit with short circuit between output and input - Google Patents
Inverter protection circuit with short circuit between output and input Download PDFInfo
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- CN214154003U CN214154003U CN202022477259.9U CN202022477259U CN214154003U CN 214154003 U CN214154003 U CN 214154003U CN 202022477259 U CN202022477259 U CN 202022477259U CN 214154003 U CN214154003 U CN 214154003U
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Abstract
The utility model relates to an output is to the dc-to-ac converter protection circuit of input short circuit relates to on-vehicle invertion power supply field, has solved among the prior art problem that on-vehicle power supply does not have protection circuit security difference. The technical characteristics of the three-phase current transformer are that the three-phase current transformer comprises capacitors C1-C4 and C300, a current transformer CT480, diodes D1-D5, two inductance coils, and resistors R1 and R2. The vehicle-mounted power supply has the beneficial effect of ensuring that the vehicle-mounted power supply has no potential safety hazard through the protection circuit.
Description
Technical Field
The utility model relates to a vehicle-mounted inverter power supply technical field, in particular to output is to dc-to-ac converter protection circuit of input short circuit.
Background
A vehicle-mounted inverter is an electronic device for converting 27V direct current into 220V/50Hz commercial power, and the power can reach 1000W. The power supply conversion device can be used for common electric appliances and is very convenient power supply conversion equipment for vehicles. The first type is rectification load, such as printer, mobile DVD, various chargers, video disc player, combined audio, game machine, digital camera, notebook computer, etc.; the second category is inductive load, fluorescent lamp, electric fan, etc.; and the third type is resistive load, such as electric heating cup, small electric heating appliance, etc. The vehicle-mounted inverter is directly connected with a cigarette lighter or a storage battery of an automobile, so that the vehicle-mounted inverter can be used by general electronic products, electrical appliances which can be used in families can be used on the automobile when people go out to work or travel, and great convenience is brought to the life of people, so that the vehicle-mounted inverter is popular and almost necessary for each automobile. As a power source of the vehicle-mounted electronic equipment, the vehicle-mounted inverter becomes an indispensable device for safe and reliable power supply of a vehicle-mounted system due to the advantages of strong adaptability, safety, reliability and the like. The safety and reliability of the vehicle-mounted power supply are almost the necessary requirements of all power supply equipment in specific application occasions of the vehicle-mounted power supply, particularly for the vehicle-mounted power supply, the safety is related to the personal safety and property rights of a vehicle owner, if the power supply has potential safety hazards, a protection circuit is not provided, a light person easily burns the power supply, and a fire disaster is caused if the power supply is heavy.
SUMMERY OF THE UTILITY MODEL
The utility model discloses solve the technical problem that the vehicle mounted power supply among the prior art does not have protection circuit security poor, provide an output to the dc-to-ac converter protection circuit of input short circuit.
In order to solve the technical problem, the technical scheme of the utility model is specifically as follows:
an inverter power protection circuit with short-circuited output to input, comprising: capacitors C1-C4 and C300, a current transformer CT480, diodes D1-D5, two inductance coils, and resistors R1 and R2;
one end of the capacitor C1 is connected with one end of the capacitors C3 and C4 and one end of the resistor R2 through an inductance coil,
one end of the capacitor C2 is connected to the other end of the capacitor C3 and the second port of the current transformer CT480 through another inductor, and the other ends of the capacitors C1 and C2 are connected to the case ground of the inverter.
The other end of the capacitor C4 is connected to the first port of the current transformer CT480,
the other end of the resistor R2 is respectively connected with a fourth port of the current transformer CT480, one end of a diode D1 and one end of a diode D2 through a diode D5;
a third port of the current transformer CT480 is connected to one end of a diode D3 and one end of a diode D4, respectively, and the other end of the diode D3 is connected to the other end of the diode D1, a resistor R1 and an MCU, respectively;
the other end of the diode D4 is connected to the other end of the diode D2, the other end of the resistor R1, and one end of the capacitor C300, respectively, and the other end of the capacitor C300 is connected to the inverter power supply case ground.
Further, the resistance of the capacitor R1 is 100 Ω, and the resistance of the resistor R2 is 10K Ω.
Further, the model of the diode D5 is M7.
Further, the model of the inductance coil is M600.
The utility model discloses following beneficial effect has:
the utility model discloses an output is to the invertion power supply protection circuit of input short circuit, current transformer CT480, diode D1 ~ D4, resistance R1 sample the L line current, follow the size that sampling singlechip interface judged the electric current through voltage, realize the overcurrent protection function. R2 and D5 are added on the basis of the overcurrent protection function, and when an output L line and an output N line are respectively short-circuited to an input anode and an ACCIN signal line, the inverter power supply does not have 220V output in short-circuit protection. After the short-circuit state is relieved, the inverter power supply needs to be powered off, the product is restarted to normally work, and the vehicle-mounted power supply is guaranteed to have no potential safety hazard through the protection circuit.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of an inverter protection circuit with short-circuited output to input according to 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 inverter power protection circuit with short-circuited output to input includes: capacitors C1-C4 and C300, a current transformer CT480, diodes D1-D5, two inductance coils, and resistors R1 and R2;
one end of the capacitor C1 is connected with one end of the capacitors C3 and C4 and one end of the resistor R2 through an inductance coil,
one end of the capacitor C2 is connected to the other end of the capacitor C3 and the second port of the current transformer CT480 through another inductor, and the other ends of the capacitors C1 and C2 are connected to the case ground of the inverter.
The other end of the capacitor C4 is connected to the first port of the current transformer CT480,
the other end of the resistor R2 is respectively connected with a fourth port of the current transformer CT480, one end of a diode D1 and one end of a diode D2 through a diode D5;
a third port of the current transformer CT480 is connected with one end of a diode D3 and one end of a diode D4, respectively, and the other end of the diode D3 is connected with the other end of the diode D1, a resistor R1 and an MCU, respectively;
the other end of the diode D4 is respectively connected with the other end of the diode D2, the other end of the resistor R1 and one end of the capacitor C300, and the other end of the capacitor C300 is connected with the inverter power supply shell ground;
the resistance of the capacitor R1 is 100 Ω, and the resistance of the resistor R2 is 10K Ω.
Diode D5 is model M7.
The model of the inductance coil is M600.
The working principle is as follows: the vehicle-mounted inverter power supply realizes the conversion from 27VDC to 220VAC, a low-voltage ground LGND of a printed board 27VDC is separated from a high-voltage ground HGND of the 220VAC, and after an L/N line output by the 220VAC is short-circuited with a 27VDC input end, the LGND is separated from the HGND to form a loop, so that the vehicle-mounted power supply has no short-circuit protection function. The safety of the design of the vehicle-mounted inverter power supply is influenced.
As shown in fig. 1, the current transformer CT480, the diodes D1-D4, and the resistor R1 sample the L-line current, and the magnitude of the current is determined by the voltage-following sampling single-chip interface, thereby realizing the overcurrent protection function. R2 and D5 are added on the basis of the overcurrent protection function, and when an output L line and an output N line are respectively short-circuited to an input anode and an ACCIN signal line, the inverter power supply does not have 220V output in short-circuit protection. After the short-circuit state is relieved, the inverter power supply needs to be powered off and the product is restarted to normally work.
The resistor R2 and the diode D5 are added on the basis of the original overcurrent protection circuit, so that the cost is not increased, and the safety requirement of a vehicle-mounted power supply can be met.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (4)
1. An inverter power protection circuit with short-circuited output to input, comprising:
capacitors C1-C4 and C300, a current transformer CT480, diodes D1-D5, two inductance coils, and resistors R1 and R2;
one end of the capacitor C1 is connected with one end of the capacitors C3 and C4 and one end of the resistor R2 through an inductance coil,
one end of the capacitor C2 is respectively connected with the other end of the capacitor C3 and a second port of the current transformer CT480 through another inductance coil, and the other ends of the capacitor C1 and the capacitor C2 are connected with the shell ground of the inverter power supply;
the other end of the capacitor C4 is connected to the first port of the current transformer CT480,
the other end of the resistor R2 is respectively connected with a fourth port of the current transformer CT480, one end of a diode D1 and one end of a diode D2 through a diode D5;
a third port of the current transformer CT480 is connected to one end of a diode D3 and one end of a diode D4, respectively, and the other end of the diode D3 is connected to the other end of the diode D1, a resistor R1 and an MCU, respectively;
the other end of the diode D4 is connected to the other end of the diode D2, the other end of the resistor R1, and one end of the capacitor C300, respectively, and the other end of the capacitor C300 is connected to the inverter power supply case ground.
2. The protection circuit for an inverter power supply with a short circuit between an output and an input of claim 1, wherein the resistance of the capacitor R1 is 100 Ω, and the resistance of the resistor R2 is 10K Ω.
3. The protection circuit for an inverter power supply with short circuit between output and input of claim 1, wherein the diode D5 has a model number M7.
4. The protection circuit for an inverter power supply with a short circuit between an output and an input of claim 1, wherein the type of the inductor is M600.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022477259.9U CN214154003U (en) | 2020-10-29 | 2020-10-29 | Inverter protection circuit with short circuit between output and input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022477259.9U CN214154003U (en) | 2020-10-29 | 2020-10-29 | Inverter protection circuit with short circuit between output and input |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214154003U true CN214154003U (en) | 2021-09-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022477259.9U Active CN214154003U (en) | 2020-10-29 | 2020-10-29 | Inverter protection circuit with short circuit between output and input |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214154003U (en) |
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2020
- 2020-10-29 CN CN202022477259.9U patent/CN214154003U/en active Active
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| TR01 | Transfer of patent right |
Effective date of registration: 20230801 Address after: No. 118-1 Dongfeng Street, High tech Industrial Development Zone, Changchun City, Jilin Province, 130000 Patentee after: Changchun Xinlian Technology Co.,Ltd. Address before: 130000 room 311, third floor, No. 118-1, Dongfeng Street, high tech Industrial Development Zone, Changchun City, Jilin Province Patentee before: Changchun Tongyuan Zhihe Technology Co.,Ltd. |