CN203617692U - Protective system against output short circuit of inverter - Google Patents
Protective system against output short circuit of inverter Download PDFInfo
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- CN203617692U CN203617692U CN201320787126.9U CN201320787126U CN203617692U CN 203617692 U CN203617692 U CN 203617692U CN 201320787126 U CN201320787126 U CN 201320787126U CN 203617692 U CN203617692 U CN 203617692U
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- 230000001681 protective effect Effects 0.000 title abstract 4
- 239000003990 capacitor Substances 0.000 claims abstract description 30
- 238000010438 heat treatment Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model provides a protective system against output short circuit of an inverter. The protective system comprises a trigger pulse circuit composed of a chip U3, a capacitor C7, a capacitor C13, a resistor R5 and a triode Q1, a double voltage comparator integrated circuit LM393 and an H-bridge drive circuit composed of chips U4 and U5, wherein one end of the capacitor C7 and one end of the capacitor C13 are respectively electrically connected with a pin 5 and a pin 6 of the chip U3, and the other end of the capacitor C7 and the other end of the capacitor C13 are grounded; and the base electrode of the triode Q1 is connected with a pin 7 of the double voltage comparator integrated circuit LM393, and the collector electrode of the triode Q1 is electrically connected with a pin 2 of the chip U3. The protective system against output short circuit of the inverter limits the output power of a machine to achieve constant power, thereby protecting the machine to the largest extent.
Description
Technical field
The utility model relates to Circuits System field, refers to especially a kind of inverter output short circuit protection system.
Background technology
Inverter is that direct current energy (battery, accumulator jar) is transformed into alternating current (being generally 220V, 50Hz sine wave), and it is made up of inverter bridge, control logic and filter circuit.In inverter, current output 220V short circuit technology H bridge metal-oxide-semiconductor loss ratio is larger, generates heat larger, if long-time short circuit meeting causes metal-oxide-semiconductor punch through damage, thereby causes the consequence of machine breakdown.
Utility model content
The deficiency existing for prior art, the purpose of this utility model is to provide a kind of and prevents the damage of electronic devices and components with emergency protection short circuit current, and heating is few, the inverter output short circuit protection system that coefficient of safety is high.
The technical solution of the utility model is achieved in that a kind of inverter output short circuit protection system, and it comprises trigger impulse circuit, two voltage comparator integrated circuit LM393 and the chip U4 of chip U3, capacitor C 7, capacitor C 13, resistance R 5 and triode Q1 composition and the H bridge drive circuit of U5 composition; Described capacitor C 7, capacitor C 13 one end are electrically connected with pin 5 and the pin 6 of chip U3 respectively, its other end ground connection; The base stage of described triode Q1 is connected with the pin 7 of two voltage comparator integrated circuit LM393, and the pin 2 of its collector electrode and chip U3 is electrically connected.
Further, described couple of voltage comparator integrated circuit LM393 comprises operational amplifier U2B and operational amplifier U2A.
Further, a kind of inverter output short circuit protection system also comprises resistance R 3, resistance R 4, resistance R 28, resistance R 6, resistance R 7 forms reference voltage; Described resistance R 3, resistance R 4, resistance R 28 is in parallel and connect with R6 and R7; Described resistance R 8 and resistance R 9 are connected and are in parallel with the pin 7 of operational amplifier U2B and the pin 1 of operational amplifier U2A.
Further, a kind of inverter output short circuit protection system also comprises capacitor C 3 and capacitor C 4; Described filter capacitor C3 is electrically connected on the pin 7 of operational amplifier U2B; Described filter capacitor C4 is electrically connected on the pin 1 of operational amplifier U2A.
Further, pin 4 ground connection of described operational amplifier U2A.
A kind of inverter output short circuit protection system of the present utility model, can emergency protection short circuit current, prevents the damage of electronic devices and components, and heating is few, and coefficient of safety is high.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the electrical block diagram of a kind of inverter output short circuit protection of the utility model system;
Fig. 2 is the electrical block diagram of a kind of inverter output short circuit protection of the utility model system.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
As depicted in figs. 1 and 2: a kind of inverter output short circuit protection system, it comprises trigger impulse circuit, two voltage comparator integrated circuit LM393 and the chip U4 of chip U3, capacitor C 7, capacitor C 13, resistance R 5 and triode Q1 composition and the H bridge drive circuit of U5 composition; Described capacitor C 7, capacitor C 13 one end are electrically connected with pin 5 and the pin 6 of chip U3 respectively, its other end ground connection; The base stage of described triode Q1 is connected with the pin 7 of two voltage comparator integrated circuit LM393, and the pin 2 of its collector electrode and chip U3 is electrically connected; Described chip U3 is NE555 chip, once its function is to enter protection, NE555 chip sends interim pulse and tests short-circuit conditions.
Above-mentioned a kind of inverter output short circuit protection system, described couple of voltage comparator integrated circuit LM393 comprise operational amplifier U2B and operational amplifier U2A.
Above-mentioned a kind of inverter output short circuit protection system, a kind of inverter output short circuit protection system also comprise resistance R 3, resistance R 4, resistance R 28, resistance R 6, and resistance R 7 forms reference voltage; Described resistance R 3, resistance R 4, resistance R 28 is in parallel and connect with R6 and R7; Described resistance R 8 and resistance R 9 are connected and are in parallel with the pin 7 of operational amplifier U2B and the pin 1 of operational amplifier U2A.
Above-mentioned a kind of inverter output short circuit protection system, a kind of inverter output short circuit protection system also comprise capacitor C 3 and capacitor C 4; Described filter capacitor C3 is electrically connected on the pin 7 of operational amplifier U2B; Described filter capacitor C4 is electrically connected on the pin 1 of operational amplifier U2A.
Above-mentioned a kind of inverter output short circuit protection system, pin 4 ground connection of described operational amplifier U2A.
The in the situation that of output 220V short circuit, sample rate current, a pin output high level of two voltage comparator integrated circuit LM393, close chip U4, the pin 7 of two voltage comparator integrated circuit LM393 is exported a high level and is opened triode Q1, flip chip U3, and chip U3 forms an interim pulse, remove to close chip U5, periodically detect.The H bridge drive circuit of chip U4 and U5 composition makes metal-oxide-semiconductor loss little like that, can not generate heat, and short circuit for a long time, estimates that short circuit several years can.
A kind of inverter output short circuit protection system of the present utility model, can emergency protection short circuit current, prevents the damage of electronic devices and components, and heating is few, and coefficient of safety is high.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (5)
1. an inverter output short circuit protection system, is characterized in that: it comprises trigger impulse circuit, two voltage comparator integrated circuit LM393 and the chip U4 of chip U3, capacitor C 7, capacitor C 13, resistance R 5 and triode Q1 composition and the H bridge drive circuit of U5 composition; Described capacitor C 7, capacitor C 13 one end are electrically connected with pin 5 and the pin 6 of chip U3 respectively, its other end ground connection; The base stage of described triode Q1 is connected with the pin 7 of two voltage comparator integrated circuit LM393, and the pin 2 of its collector electrode and chip U3 is electrically connected.
2. a kind of inverter output short circuit protection system according to claim 1, is characterized in that: described couple of voltage comparator integrated circuit LM393 comprises operational amplifier U2B and operational amplifier U2A.
3. a kind of inverter output short circuit protection system according to claim 2, is characterized in that: a kind of inverter output short circuit protection system also comprises resistance R 3, resistance R 4, resistance R 28, resistance R 6, and resistance R 7 forms reference voltage; Described resistance R 3, resistance R 4, resistance R 28 is in parallel and connect with R6 and R7; Described resistance R 8 and resistance R 9 are connected and are in parallel with the pin 7 of operational amplifier U2B and the pin 1 of operational amplifier U2A.
4. a kind of inverter output short circuit protection system according to claim 2, is characterized in that: a kind of inverter output short circuit protection system also comprises capacitor C 3 and capacitor C 4; Described filter capacitor C3 is electrically connected on the pin 7 of operational amplifier U2B; Described filter capacitor C4 is electrically connected on the pin 1 of operational amplifier U2A.
5. a kind of inverter output short circuit protection system according to claim 3, is characterized in that: pin 4 ground connection of described operational amplifier U2A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320787126.9U CN203617692U (en) | 2013-12-03 | 2013-12-03 | Protective system against output short circuit of inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320787126.9U CN203617692U (en) | 2013-12-03 | 2013-12-03 | Protective system against output short circuit of inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203617692U true CN203617692U (en) | 2014-05-28 |
Family
ID=50770315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320787126.9U Expired - Lifetime CN203617692U (en) | 2013-12-03 | 2013-12-03 | Protective system against output short circuit of inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203617692U (en) |
-
2013
- 2013-12-03 CN CN201320787126.9U patent/CN203617692U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140528 |