CN104901279A - Frequency conversion module protection circuit and protection method thereof - Google Patents
Frequency conversion module protection circuit and protection method thereof Download PDFInfo
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- CN104901279A CN104901279A CN201510095185.3A CN201510095185A CN104901279A CN 104901279 A CN104901279 A CN 104901279A CN 201510095185 A CN201510095185 A CN 201510095185A CN 104901279 A CN104901279 A CN 104901279A
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- frequency
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- variable module
- protective circuit
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Abstract
The invention discloses a frequency conversion module protection circuit, which is arranged between a single chip microcomputer control port and a frequency conversion module enabled port. The protection circuit comprises a DC-blocking AC-passing module and a reverse-phase module. In a normal working mode of the single chip microcomputer, the protection circuit converts pulse signals outputted by the control port of the single chip microcomputer to enabled signals and outputs the enabled signals to the frequency conversion module enabled port to trigger the frequency conversion module to work. In an abnormal working mode of the single chip microcomputer, the protection circuit converts fixed signals outputted by the control port of the single chip microcomputer to disabled signals and outputs the disabled signals to the enabled port of the frequency conversion module to stop the frequency conversion module from working.
Description
Technical field
The present invention relates to a kind of protective circuit, especially a kind of for frequency-variable module protective circuit and guard method thereof.
Background technology
Along with improving constantly of modern society's automaticity, variable frequency control have also been obtained application widely.Frequency-variable module protection conventional is at present that the enable port operated on frequency-variable module by scm software is protected; if during the faults such as scm software generation race flies, deadlock; enable port can not get timely operation and can damage at once, causes whole frequency converter failure.
Therefore be necessary that more easy, that reliability is higher and cost the is lower scheme of Application and Development solves above problem.
Summary of the invention
Present invention is disclosed a kind of frequency-variable module protective circuit; be arranged between Single-chip Controlling end and frequency-variable module enable port; described protective circuit comprises every straight-through friendship module and inversed module, and under single-chip microcomputer normal mode of operation, the pulse signal that Single-chip Controlling end exports is converted into enable signal and exports frequency-variable module enable port to trigger frequency-variable module work by protective circuit.Under single-chip microcomputer anomalous operating mode, the fixed signal that Single-chip Controlling end exports is converted into disable signal and exports frequency-variable module enable port to forbid frequency-variable module work by protective circuit.
Wherein, describedly charging circuit and discharge circuit is comprised every straight-through friendship module.
Wherein, described inversed module will every the signal negate process of straight-through friendship module output.
Meet in one embodiment of the invention, described enable port is that high level signal is effective.In this scheme, enable signal is high level signal, and disable signal is low level signal.
In another embodiment according to the invention, described enable port is that low level signal is effective.In this scheme, enable signal is low level signal, and disable signal is high level signal.
A kind of frequency-variable module guard method, its step is as follows: S1, and Single-chip Controlling end exports control signal, and when single-chip microcomputer is working properly, control signal is pulse signal, and during abnormal work, control signal is fixed signal; S2, protective circuit exports frequency-variable module enable port to by after control signal process, and pulse control signal is treated to enable signal, fixing control signal process disable signal; S3, frequency-variable module enable port receives the signal controlling frequency-variable module operating state that protective circuit exports, and enable signal triggers frequency-variable module work, and disable signal-inhibiting frequency-variable module works.
In the present invention, protective circuit only can add diode by resistance, constant volume and triode forms, and production cost is low.The present invention utilize electric capacity every straight-through friendship characteristic, when scm software cannot normally work, the enable port of frequency-variable module is prohibited thus can not damages frequency-variable module, and when scm software recovers, frequency-variable module normally works, and protective circuit reliability is high.The present invention all adopts SMD components, high speed placement system can be adopted to mount, take PCB space minimum in manufacture process, not by spatial limitation.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of frequency-variable module protective circuit according to the invention;
Fig. 2 is the circuit diagram of frequency-variable module protective circuit according to the invention;
Embodiment
Below in conjunction with accompanying drawing, specific embodiment of the invention scheme is described in detail.
Fig. 1 is the structured flowchart of frequency-variable module protective circuit according to the invention; this protective circuit 100 is arranged between single-chip microcomputer 200 and frequency-variable module 300; on single-chip microcomputer 200, control end 220 is for exporting control signal, and on frequency-variable module 300, come into operation as frequency-variable module after reception input signal in enable port 330.Protective circuit 100 comprises every straight-through friendship module 110 and inversed module 150; when single-chip microcomputer 200 normally works, the pulse signal that single-chip microcomputer 200 control end 220 exports is converted into enable signal and exports frequency-variable module 300 enable port 330 to and work to trigger frequency-variable module 300 by protective circuit 100.When single-chip microcomputer 200 abnormal work, the fixed signal that single-chip microcomputer 200 control end 220 exports is converted into disable signal and exports frequency-variable module 300 enable port 330 to forbid that frequency-variable module 300 works by protective circuit 100.
Fig. 2 is a specific embodiment of frequency-variable module protective circuit according to the invention, and the enable signal of enable port 330 is high level signal in this embodiment.As shown in Figure 2, the Enable Pin 330 of MCU to be Single-chip Controlling end 220, FAULT be frequency-variable module 300.When there being abnormal conditions to occur (as scm software deadlock etc.), MCU can only keep fixed level signal (high level or low level).When MCU exports as fixed level signal, protective circuit 100 exports as low level signal; During MCU output pulse signal, protective circuit 100 exports as high level signal.Enable port 330 due to frequency-variable module is that high level is effective, therefore effectively shields the abnormal impact on frequency-variable module 300 of single-chip microcomputer 200.
When single-chip microcomputer 200 normally works, control end 220 (MCU) output pulse signal.Comprise charging flow and discharge flow path every straight-through friendship module 110, when receiving high level pulse signal, high level to electric capacity C1, then completes charging flow through diode D1 to electric capacity C2 through resistance R1; When receiving low level pulse, electric capacity C2 completes discharge flow path by resistance R2 to triode Q1, and make triode Q1 conducting output low level, electric capacity C1 completes discharge flow path by diode D2 to resistance R1.So repeatedly work, because the discharge time arranging electric capacity C2 in this programme is greater than the charging interval, make triode Q1 be in conducting state always, maintain output low level.The low level signal exported every straight-through friendship module 110 changes into the enable port 330 (FAULT) on high level signal input frequency-variable module 300 after inversed module 150 processes, and enable port 330 (FAULT) is triggered thus frequency-variable module 300 is normally worked.
When single-chip microcomputer 200 operation irregularity; as software generation race fly, the fault such as deadlock; control end 220 (MCU) exports fixed level signal, high level or low level, because capacitance exists; in circuit, triode Q1 cannot conducting; Q2 normally in back-end circuit, output low level, enable port 330 (FAULT) is prohibited; frequency-variable module 300 does not work, thus protection frequency-variable module.
In another embodiment of the present invention, when the enable signal of enable port 330 is low level signal, only need adjust component parameter in protective circuit 100.When MCU exports as fixed level signal, protective circuit 100 exports as high level signal; During MCU output pulse signal, protective circuit 100 exports as low level signal.Because the enable port 330 of frequency-variable module is Low level effective, shield the abnormal impact on frequency-variable module 300 of single-chip microcomputer 200 equally.
Above-mentioned protective circuit, job step is as follows:
S1, Single-chip Controlling end exports control signal, and when single-chip microcomputer is working properly, control signal is pulse signal, and during abnormal work, control signal is fixed signal;
S2, protective circuit exports frequency-variable module enable port to by after control signal process, and pulse control signal is treated to enable signal, fixing control signal process disable signal;
S3, frequency-variable module enable port receives the signal controlling frequency-variable module operating state that protective circuit exports, and enable signal triggers frequency-variable module work, and disable signal-inhibiting frequency-variable module works.
The present invention is illustrated by above-described embodiment, but should be understood that, above-described embodiment just for the object of illustrating and illustrate, and is not intended to the present invention to be limited in described scope of embodiments.In addition one of ordinary skill in the art will appreciate that the present invention is not limited to above-described embodiment, more kinds of variants and modifications can also be made according to instruction of the present invention, within these variants and modifications all drop on the present invention's scope required for protection.Protection scope of the present invention defined by the appended claims and equivalent scope thereof.
Claims (9)
1. a frequency-variable module protective circuit; be arranged between Single-chip Controlling end and frequency-variable module enable port; it is characterized in that: described protective circuit comprises every straight-through friendship module and inversed module; under single-chip microcomputer normal mode of operation, the pulse signal that Single-chip Controlling end exports is converted into enable signal and exports frequency-variable module enable port to trigger frequency-variable module work by protective circuit, and under single-chip microcomputer anomalous operating mode, the fixed signal that Single-chip Controlling end exports is converted into disable signal and exports frequency-variable module enable port to forbid frequency-variable module work by protective circuit.
2. as described in claim 1 frequency-variable module protective circuit, is characterized in that: describedly comprise charging circuit and discharge circuit every straight-through friendship module.
3. the frequency-variable module protective circuit described in claim 1, is characterized in that: the signal negate process that described inversed module will export every straight-through friendship module.
4., as the frequency-variable module protective circuit as described in arbitrary in claim 1-3, it is characterized in that: described enable port is that high level signal is effective.
5. frequency-variable module protective circuit as described in claim 4, it is characterized in that: described enable signal is high level signal, disable signal is low level signal.
6. a frequency-variable module guard method, its step is as follows:
S1, Single-chip Controlling end exports control signal, and when single-chip microcomputer is working properly, control signal is pulse signal, and during abnormal work, control signal is fixed signal;
S2, protective circuit exports frequency-variable module enable port to by after control signal process, and pulse control signal is treated to enable signal, fixing control signal process disable signal;
S3, frequency-variable module enable port receives the signal controlling frequency-variable module operating state that protective circuit exports, and enable signal triggers frequency-variable module work, and disable signal-inhibiting frequency-variable module works.
7. frequency-variable module guard method as described in claim 6, is characterized in that: described protective circuit comprises every straight-through friendship module and inversed module.
8. as described in claim 7 frequency-variable module guard method, is characterized in that: describedly comprise charging circuit and discharge circuit every straight-through friendship module.
9. frequency-variable module guard method as described in claim 7, is characterized in that: the signal negate process that described inversed module will export every straight-through friendship module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510095185.3A CN104901279A (en) | 2015-03-03 | 2015-03-03 | Frequency conversion module protection circuit and protection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510095185.3A CN104901279A (en) | 2015-03-03 | 2015-03-03 | Frequency conversion module protection circuit and protection method thereof |
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| CN104901279A true CN104901279A (en) | 2015-09-09 |
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| CN201510095185.3A Pending CN104901279A (en) | 2015-03-03 | 2015-03-03 | Frequency conversion module protection circuit and protection method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1783697A (en) * | 2004-11-29 | 2006-06-07 | 海尔集团公司 | Inverse changing driving circuit for household electric appliance |
| CN101354268A (en) * | 2008-09-18 | 2009-01-28 | 浙江中控自动化仪表有限公司 | Intelligent transmitter and safety device based on monostable circuit |
| CN202034893U (en) * | 2011-03-01 | 2011-11-09 | 无锡艾柯威科技有限公司 | Pulse blocking drive circuit |
| CN202503432U (en) * | 2011-11-03 | 2012-10-24 | 武汉泰诚电气有限公司 | CPU crashing prevention control circuit of mining frequency converter |
| US20130231807A1 (en) * | 2011-09-14 | 2013-09-05 | Honda Motor Co., Ltd. | Electronic control device and vehicle control system |
| CN204761010U (en) * | 2015-03-03 | 2015-11-11 | 无锡艾柯威科技有限公司 | Frequency conversion module protection circuit |
-
2015
- 2015-03-03 CN CN201510095185.3A patent/CN104901279A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1783697A (en) * | 2004-11-29 | 2006-06-07 | 海尔集团公司 | Inverse changing driving circuit for household electric appliance |
| CN101354268A (en) * | 2008-09-18 | 2009-01-28 | 浙江中控自动化仪表有限公司 | Intelligent transmitter and safety device based on monostable circuit |
| CN202034893U (en) * | 2011-03-01 | 2011-11-09 | 无锡艾柯威科技有限公司 | Pulse blocking drive circuit |
| US20130231807A1 (en) * | 2011-09-14 | 2013-09-05 | Honda Motor Co., Ltd. | Electronic control device and vehicle control system |
| CN202503432U (en) * | 2011-11-03 | 2012-10-24 | 武汉泰诚电气有限公司 | CPU crashing prevention control circuit of mining frequency converter |
| CN204761010U (en) * | 2015-03-03 | 2015-11-11 | 无锡艾柯威科技有限公司 | Frequency conversion module protection circuit |
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Application publication date: 20150909 |