CN204118703U - A kind of protective circuit of power electronic equipment power model - Google Patents
A kind of protective circuit of power electronic equipment power model Download PDFInfo
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- CN204118703U CN204118703U CN201420508775.5U CN201420508775U CN204118703U CN 204118703 U CN204118703 U CN 204118703U CN 201420508775 U CN201420508775 U CN 201420508775U CN 204118703 U CN204118703 U CN 204118703U
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Abstract
A kind of protective circuit of power electronic equipment power model, comprise the fault-signal collector unit, fault-signal Logical processing unit and the drive singal output unit that are sequentially connected in series, the input of described fault-signal collector unit is the input of whole protective circuit, and the output of described drive singal output unit is the output of whole protective circuit; The utility model can various faults protection simultaneously in realizing circuit, and corresponding speed is fast, and ensure that device is not damaged when circuit breaks down, have structure simple, logic is controlled, and cost is low, the advantage that stability is higher.
Description
Technical field
The utility model relates to the safe operation technical field of power electronic equipment, is specifically related to a kind of protective circuit of power electronic equipment power model.
Background technology
In order to ensure the safe operation of power electronic equipment, overcurrent in circuit, overvoltage/undervoltage, the measure of overheat protector is absolutely necessary, current most of protective circuit all adopts analog circuit to carry out overvoltage or overcurrent protection, or the mode adopting transducer to combine with control unit is protected, but these safeguard measures are just carried out independent circuit design for a certain item overvoltage or overcurrent or take safeguard measure, be difficult to a lot of failure problems to focus in a kind of protective circuit carry out centralized control, so existing protective circuit is in order to protect various failure condition, need according to a lot of circuit of various accident design or take much different schemes to reach comprehensive protection, circuit in such circuit will be very complicated, stability and the reliability of relative whole system are poor.
Summary of the invention
In order to solve above-mentioned prior art Problems existing; the utility model provides a kind of protective circuit of power electronic equipment power model; can various faults protection simultaneously in realizing circuit; corresponding speed is fast; ensure that device is not damaged when circuit breaks down, have structure simple, logic is controlled; cost is low, the advantage that stability is higher.
For reaching above object, the utility model adopts following technical scheme:
A kind of protective circuit of power electronic equipment power model, comprise the fault-signal collector unit, fault-signal Logical processing unit and the drive singal output unit that are sequentially connected in series, the input of described fault-signal collector unit is the input of whole protective circuit, and the output of described drive singal output unit is the output of whole protective circuit;
Described fault-signal collector unit forms with door by three, wherein first is connected with two inputs of door with the 3rd with the output of door with second respectively with door, wherein first input various fault message with door and second respectively with the input of door, the 3rd and the output of door be the output of fault information collection unit;
Described fault-signal Logical processing unit is made up of two NAND gate, wherein an input of the first NAND gate fixes the fault recovery signal of input system, another one input is connected with the output of the second NAND gate, an input of described second NAND gate is connected with the output of described fault-signal collector unit, another one input is connected with the output of the first NAND gate, and the output of described first NAND gate is that the output of fault-signal Logical processing unit is connected with the input of drive singal output unit;
Described drive singal output unit comprises the NAND gate be sequentially connected in series, a triode and a level translator, the output of described NAND gate is connected with the grid of triode, the collector electrode of described triode is held with the OE of level translator and is connected, wherein the OE end of level translator is the Enable Pin of level translator, the level of this terminal is effective, namely when OE end is for low level, the normal output drive signal of level translator, when OE end is for high level, level translator does not work, and output is low level.
Compared to the prior art comparatively, the utility model tool has the following advantages:
1) this protective circuit is by the logic control of digital circuit, can various faults protection simultaneously in realizing circuit.
2) this protective circuit adopts digital circuit, and corresponding speed is fast, ensures that device is not damaged when circuit breaks down.
3) this protective circuit structure is simple, and logic is controlled, and cost is low, and stability is higher.
Accompanying drawing explanation
Fig. 1 is the protective circuit figure of the utility model power electronic equipment power model.
Fig. 2 is the utility model fault-signal collector unit circuit diagram.
Fig. 3 is the utility model fault-signal Logical processing unit circuit diagram.
Fig. 4 is the utility model drive singal output unit circuit diagram.
Embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
As shown in Figure 1, the protective circuit of a kind of power electronic equipment power model of the utility model, comprise the fault-signal collector unit be sequentially connected in series, fault-signal Logical processing unit and drive singal output unit, namely the output of described signal collection unit is connected with the input of fault-signal Logical processing unit, the output of described fault-signal Logical processing unit is connected with the input of drive singal output unit, the input of described fault-signal collector unit is the input of whole protective circuit, the output of described drive singal output unit is the output of whole protective circuit.
Described fault-signal Logical processing unit mainly carries out logical process to the fault-signal of input; The control information of fault-signal Logical processing unit mainly exports by described drive singal output unit, final control drive singal output is enable or forbids, even if drive singal output unit sends drive singal under normal circumstances at circuit, system is normally run; Under circuit breaks down situation, forbid that drive singal exports, make system out of service, thus reach the effect of protective circuit.
As shown in Figure 2, described fault-signal collector unit forms with door by three, wherein first with door 1 output terminals A
1with second with the output terminals A of door 2
2be connected with two inputs of door 3 with the 3rd respectively, wherein first input various fault message with door 1 and second respectively with the input of door 2, the 3rd and the output terminals A of door 3
3for the output of fault information collection unit.
Its circuit working principle: when the input signal of fault-signal collector unit normally works, each input signal is high level, then three are respectively A with the output of door
1=1, A
2=1, A
3=1, in the fault-signal of input during any road signal fault, namely have low level in input signal, then the 3rd is low level, i.e. A with the output signal of door
3=0.
As shown in Figure 3, described fault-signal Logical processing unit is made up of two NAND gate, wherein an input B of the first NAND gate 4
1the fault recovery signal of fixing input system, another one input is connected with the output of the second NAND gate 5, an input of described second NAND gate 5 is connected with the output of described fault-signal collector unit, the output B of another one input and the first NAND gate 4
1be connected, the output of described first NAND gate 4 is that the output of fault-signal Logical processing unit is connected with the input of drive singal output unit.
The circuit working logic (this logic is order actuating logic) of fault-signal Logical processing unit, as shown in table 1:
Table 1
Circuit carrying out practically logical order:
When system electrification works, 2. 1. actuating logic arrive;
Logic is maintained 2. during system worked well;
During system jam, actuating logic 3.;
When System recover is normal, 5. 4. actuating logic arrive.
As shown in Figure 4, described drive singal output unit comprises the NAND gate be sequentially connected in series, a triode and a level translator, the output of described NAND gate is connected with the grid of triode, the collector electrode of described triode is held with the OE of level translator and is connected, wherein the OE end of level translator is the Enable Pin of level translator, the level of this terminal is effective, namely when OE end is for low level, the normal output drive signal of level translator, when OE end is for high level, level translator does not work, and output is low level.
The circuit working principle of described drive singal output unit:
When drive singal output unit input signal is all high level, i.e. C
1=1, C
2when=1, C
3=0.Now C
4=0, level translator OE signal is enable, and chip normally works, and PWM exports.
When input signal wherein has a road for being low level, i.e. C
1=0, C
2=1 or C
1=1, C
2=0 or C
1=0, C
2when=0, C
3=1.Now C
4=1, level translator OE signal-inhibiting, chip forbids work, blocks PWM output signal.
The operation principle of the utility model protective circuit is: this circuit is as a kind of protective circuit of the many-sided fault of power electronic equipment; by the collection to various faults signal; judge working state of system, reach the control to power model drive singal, thus reach the protection to power model.
When the systems are operating normally, fault-free signal inputs, A in fault-signal collector unit
3=1, i.e. B
2=1, now according to the logical order B of fault-signal Logical processing unit
1=1, can B be made
3=1, i.e. C
1=1, PWM enable signal C in system
2be now high level, can C be made
3=0, then triode ON C
4=0, i.e. level translator Enable Pin OE=0, level translator normally works, and exports PWM drive singal.
When the normal exception of system, fault-signal inputs, A in fault-signal collector unit
3=0, i.e. B
2=0, now B
1with B
2effect makes B
3=0, i.e. C
1=0, then no matter C
2that which kind of state all makes C
3=1, then triode is forbidden, C
4=1, i.e. the Enable Pin OE=1 of level translator, level translator is prohibited, and the drive singal output of level translator is blocked.
In sum, when system is normal, the control of PWM output can be carried out by system itself; When system exception, forbid that drive singal exports by protective circuit itself, respond fault-signal fast and effectively.
Claims (1)
1. the protective circuit of a power electronic equipment power model, it is characterized in that: comprise the fault-signal collector unit, fault-signal Logical processing unit and the drive singal output unit that are sequentially connected in series, the input of described fault-signal collector unit is the input of whole protective circuit, and the output of described drive singal output unit is the output of whole protective circuit;
Described fault-signal collector unit forms with door by three, wherein first is connected with two inputs of door with the 3rd with the output of door with second respectively with door, wherein first input various fault message with door and second respectively with the input of door, the 3rd and the output of door be the output of fault information collection unit;
Described fault-signal Logical processing unit is made up of two NAND gate, wherein an input of the first NAND gate fixes the fault recovery signal of input system, another one input is connected with the output of the second NAND gate, an input of described second NAND gate is connected with the output of described fault-signal collector unit, another one input is connected with the output of the first NAND gate, and the output of described first NAND gate is that the output of fault-signal Logical processing unit is connected with the input of drive singal output unit;
Described drive singal output unit comprises the NAND gate be sequentially connected in series, a triode and a level translator, the output of described NAND gate is connected with the grid of triode, the collector electrode of described triode is held with the OE of level translator and is connected, wherein the OE end of level translator is the Enable Pin of level translator, the level of this terminal is effective, namely when OE end is for low level, the normal output drive signal of level translator, when OE end is for high level, level translator does not work, and output is low level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420508775.5U CN204118703U (en) | 2014-09-04 | 2014-09-04 | A kind of protective circuit of power electronic equipment power model |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420508775.5U CN204118703U (en) | 2014-09-04 | 2014-09-04 | A kind of protective circuit of power electronic equipment power model |
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| Publication Number | Publication Date |
|---|---|
| CN204118703U true CN204118703U (en) | 2015-01-21 |
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ID=52335983
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|---|---|---|---|
| CN201420508775.5U Active CN204118703U (en) | 2014-09-04 | 2014-09-04 | A kind of protective circuit of power electronic equipment power model |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786394A (en) * | 2016-11-28 | 2017-05-31 | 珠海恒途电子有限公司 | Interlock protection circuit |
| CN107395190A (en) * | 2017-07-24 | 2017-11-24 | 安徽力高新能源技术有限公司 | A kind of circuit and drive system of fast reaction fault-signal |
| CN108429537A (en) * | 2018-04-04 | 2018-08-21 | 北京动力源科技股份有限公司 | A kind of photovoltaic DC-to-AC converter fault logic circuits and electronic equipment |
| CN109167596A (en) * | 2018-10-16 | 2019-01-08 | 陕西航空电气有限责任公司 | A kind of aviation DC generator control device fault-signal latch cicuit |
-
2014
- 2014-09-04 CN CN201420508775.5U patent/CN204118703U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786394A (en) * | 2016-11-28 | 2017-05-31 | 珠海恒途电子有限公司 | Interlock protection circuit |
| CN107395190A (en) * | 2017-07-24 | 2017-11-24 | 安徽力高新能源技术有限公司 | A kind of circuit and drive system of fast reaction fault-signal |
| CN107395190B (en) * | 2017-07-24 | 2024-03-22 | 力高(山东)新能源技术股份有限公司 | Circuit and driving system for rapidly responding to fault signals |
| CN108429537A (en) * | 2018-04-04 | 2018-08-21 | 北京动力源科技股份有限公司 | A kind of photovoltaic DC-to-AC converter fault logic circuits and electronic equipment |
| CN108429537B (en) * | 2018-04-04 | 2024-01-12 | 北京动力源科技股份有限公司 | Photovoltaic inverter fault processing circuit and electronic equipment |
| CN109167596A (en) * | 2018-10-16 | 2019-01-08 | 陕西航空电气有限责任公司 | A kind of aviation DC generator control device fault-signal latch cicuit |
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| GR01 | Patent grant |