CN104617940A - ISP interface circuit and air-conditioner - Google Patents
ISP interface circuit and air-conditioner Download PDFInfo
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- CN104617940A CN104617940A CN201510009552.3A CN201510009552A CN104617940A CN 104617940 A CN104617940 A CN 104617940A CN 201510009552 A CN201510009552 A CN 201510009552A CN 104617940 A CN104617940 A CN 104617940A
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- optical coupler
- isp
- interface circuit
- control chip
- circuit
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Abstract
The invention provides an ISP interface circuit and an air-conditioner. The ISP interface circuit comprises an ISP connector and a control chip, and also comprises an isolating circuit connected with the ISP connector and a signal restoring circuit connected with the output end of the isolating circuit; the output end of the signal restoring circuit is connected with the control chip. According to the ISP interface circuit and the air-conditioner, the isolating circuit is capable of isolating the DC signal of large voltage when a power wire is connected wrong, and therefore, the control chip can be protected against burnout; the signal restoring circuit is arranged at the rear end of the isolating circuit to ensure that ISP signals can be input into the control chip.
Description
Technical field
The present invention relates to field of air conditioning, in particular to a kind of ISP interface circuit and air conditioner.
Background technology
In prior art, the protection of the ISP interface of display is mainly divided into two large classes, wherein a kind of is the security protection of ISP software view, another is the electrostatic defending of interface circuit, above-mentioned two kinds of protection methods all do not consider the situation that power line misplug enters, when power line misconnection, be easy to directly cause control chip to burn out.
Summary of the invention
The present invention aims to provide one and can prevent power line misconnection from causing control chip to burn out ISP interface circuit and air conditioner.
The invention provides a kind of ISP interface circuit, comprise ISP connector and control chip, ISP interface circuit also comprises the buffer circuit be connected with ISP connector and the signal recovery circuitry be connected with the output of buffer circuit, and the output of signal recovery circuitry is connected with control chip.
Further, buffer circuit comprises optical coupler, and the input of optical coupler is connected with ISP connector, the output of optical coupler and signal recovery circuitry.
Further, optical coupler is the grounded emitter of triode output type optical coupler, optical coupler, and the collector electrode of optical coupler is connected with DC power supply by pull-up resistor; The input of signal recovery circuitry is connected on the collector electrode of optical coupler.
Further, signal recovery circuitry comprises inverter, and the input of inverter is connected with the collector electrode of optical coupler, and the output of inverter is connected with control chip.
Further, inverter is not gate.
Further, optical coupler is triode output type optical coupler, and the collector electrode of optical coupler is connected with DC power supply, and the emitter of optical coupler is connected with control chip; Signal recovery circuitry comprises the resistance be connected with the emitter of optical coupler.
Present invention also offers a kind of air conditioner, comprise aforesaid ISP interface circuit.
According to ISP interface circuit of the present invention and air conditioner, by arranging buffer circuit, when power line misconnection, the direct current signal of large voltage can be isolated by buffer circuit, thus prevent control chip from burning out, at the rear end signalization restore circuit of buffer circuit, ensure ISP signal to input to control chip.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the circuit theory schematic diagram of the first embodiment according to ISP interface circuit of the present invention;
Fig. 2 is the circuit theory schematic diagram of the second embodiment according to ISP interface circuit of the present invention;
Embodiment
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
As shown in Figure 1, according to ISP interface circuit of the present invention, comprise ISP connector and control chip, ISP interface circuit also comprises the buffer circuit be connected with ISP connector and the signal recovery circuitry be connected with the output of buffer circuit, and the output of signal recovery circuitry is connected with control chip.The present invention is by arranging buffer circuit, and when power line misconnection, the direct current signal of large voltage can be isolated by buffer circuit, thus prevents control chip from burning out, and at the rear end signalization restore circuit of buffer circuit, ensures ISP signal to input to control chip.
Particularly, buffer circuit comprises optical coupler, and the input of optical coupler is connected with ISP connector, the output of optical coupler and signal recovery circuitry.Employing optical coupler is isolated, and has and controls simply, the advantage that isolation effect is good.
More specifically, shown in composition graphs 1, optical coupler is the grounded emitter of triode output type optical coupler, optical coupler, and the collector electrode of optical coupler is connected with DC power supply by pull-up resistor; The input of signal recovery circuitry is connected on the collector electrode of optical coupler, thus makes the input signal of ISP connector control the output of optical coupler as control signal.Particularly, when ISP connector high input voltage, optical coupler conducting, output LOW voltage; On the contrary, when ISP connector input low-voltage, optical coupler ends, output HIGH voltage.Namely the output of optical coupler is contrary with the input of ISP connector, normal ISP signal is inputted in order to make control chip, need to revert to the output signal of optical coupler to input consistent with ISP connector, therefore inverter is accessed in signal recovery circuitry, the input of inverter is connected with the collector electrode of optical coupler, the output of inverter is connected with control chip, thus ensures ISP signal to input to control chip.Usually, inverter adopts not gate.
Particularly, composition graphs 1 illustrates the operation principle of the first embodiment of the present invention.In a first embodiment, front end adopts optical coupler quarantine measures, the design that rear end adopts not circuit anti-phase.For optical coupler, when misconnection enters power supply, utilize optical coupler to be isolated by the direct current signal of large voltage, what optocoupler exported to rear end is low level.When inputting normal ISP signal, optical coupler is by input signal logical inversion.For rear end not gate negative circuit, the signal inversion for input is CMOS or TTL logic level, in conjunction with the parameter of device, the level signal inputing to control chip can be allowed to avoid overvoltage to burn out control chip.When input power, through back-end processing, control chip obtains being CMOS or TTL high level; When inputting ISP signal, through front and back end twice oppositely, input to the signal logic of control chip and consistent before input, protection circuit effectively can be avoided to disturb the logical signal normally inputted, thus realize ISP interface protection function.Namely in a first embodiment, signal has to pass through certain protection and filters measure process and just can be input to control chip after entering ISP connector, and when input power, can automatism isolation step-down; When ISP connector inputs normal ISP signal, protection circuit can keep ISP signal to input to control chip.
Shown in composition graphs 2, in the second embodiment of the present invention, the emitter of optical coupler also can be made to export, even if the collector electrode of optical coupler is connected with DC power supply, the emitter of optical coupler is connected with control chip; Signal recovery circuitry comprises the resistance be connected with the emitter of optical coupler, thus make the output of optical coupler consistent with input, namely when optical coupler conducting, optical coupler exports the high voltage for resistance R2 two ends in Fig. 2, when optical coupler ends, the output of optical coupler is earthed voltage.Adopt the scheme of the second embodiment, can realize when input power equally, can automatism isolation step-down; When ISP connector inputs normal ISP signal, protection circuit can keep ISP signal to input to control chip.
Present invention also offers a kind of air conditioner, comprise aforesaid ISP interface circuit, thus power line misconnection can be prevented, cause control chip to burn out.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
According to ISP interface circuit of the present invention and air conditioner, according to ISP interface circuit of the present invention and air conditioner, by arranging buffer circuit, when power line misconnection, the direct current signal of large voltage can be isolated by buffer circuit, thus prevent control chip from burning out, at the rear end signalization restore circuit of buffer circuit, ensure ISP signal to input to control chip.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. an ISP interface circuit, comprise ISP connector and control chip, it is characterized in that, described ISP interface circuit also comprises the buffer circuit be connected with described ISP connector and the signal recovery circuitry be connected with the output of described buffer circuit, and the output of described signal recovery circuitry is connected with described control chip.
2. ISP interface circuit according to claim 1, is characterized in that,
Described buffer circuit comprises optical coupler, and the input of described optical coupler is connected with described ISP connector, the output of described optical coupler and described signal recovery circuitry.
3. ISP interface circuit according to claim 2, is characterized in that,
Described optical coupler is the grounded emitter of triode output type optical coupler, described optical coupler, and the collector electrode of described optical coupler is connected with DC power supply by pull-up resistor;
The input of described signal recovery circuitry is connected on the collector electrode of described optical coupler.
4. ISP interface circuit according to claim 3, is characterized in that,
Described signal recovery circuitry comprises inverter, and the input of described inverter is connected with the collector electrode of described optical coupler, and the output of described inverter is connected with described control chip.
5. ISP interface circuit according to claim 4, is characterized in that,
Described inverter is not gate.
6. ISP interface circuit according to claim 2, is characterized in that,
Described optical coupler is triode output type optical coupler, and the collector electrode of described optical coupler is connected with DC power supply, and the emitter of described optical coupler is connected with described control chip;
Described signal recovery circuitry comprises the resistance be connected with the emitter of described optical coupler.
7. an air conditioner, comprises ISP interface circuit, it is characterized in that, the ISP interface circuit of described ISP interface circuit according to any one of claim 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510009552.3A CN104617940A (en) | 2015-01-08 | 2015-01-08 | ISP interface circuit and air-conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510009552.3A CN104617940A (en) | 2015-01-08 | 2015-01-08 | ISP interface circuit and air-conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104617940A true CN104617940A (en) | 2015-05-13 |
Family
ID=53152256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510009552.3A Pending CN104617940A (en) | 2015-01-08 | 2015-01-08 | ISP interface circuit and air-conditioner |
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| Country | Link |
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| CN (1) | CN104617940A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101477613A (en) * | 2008-11-29 | 2009-07-08 | 中国北车集团大连机车研究所有限公司 | Main electricity generator simulator for inner combustion locomotive |
| CN101554672A (en) * | 2009-05-21 | 2009-10-14 | 山东大学 | Detection and control system for container corrugated plate welding track based on laser ranging |
| CN102294996A (en) * | 2011-06-08 | 2011-12-28 | 唐应时 | Electromechanical ACBS (Anti-lock Central Braking System) automobile retarder control device and control method thereof |
| CN202794961U (en) * | 2012-07-19 | 2013-03-13 | 浙江中自机电控制技术有限公司 | Electronic let-off and take-up control module |
| CN103023011A (en) * | 2013-01-10 | 2013-04-03 | 山东润峰电子科技有限公司 | Full-automatic quick reverse-connection protective charger |
-
2015
- 2015-01-08 CN CN201510009552.3A patent/CN104617940A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101477613A (en) * | 2008-11-29 | 2009-07-08 | 中国北车集团大连机车研究所有限公司 | Main electricity generator simulator for inner combustion locomotive |
| CN101554672A (en) * | 2009-05-21 | 2009-10-14 | 山东大学 | Detection and control system for container corrugated plate welding track based on laser ranging |
| CN102294996A (en) * | 2011-06-08 | 2011-12-28 | 唐应时 | Electromechanical ACBS (Anti-lock Central Braking System) automobile retarder control device and control method thereof |
| CN202794961U (en) * | 2012-07-19 | 2013-03-13 | 浙江中自机电控制技术有限公司 | Electronic let-off and take-up control module |
| CN103023011A (en) * | 2013-01-10 | 2013-04-03 | 山东润峰电子科技有限公司 | Full-automatic quick reverse-connection protective charger |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150513 |
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| RJ01 | Rejection of invention patent application after publication |