CN202333732U - Switching value output protection circuit - Google Patents
Switching value output protection circuit Download PDFInfo
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- CN202333732U CN202333732U CN 201120392216 CN201120392216U CN202333732U CN 202333732 U CN202333732 U CN 202333732U CN 201120392216 CN201120392216 CN 201120392216 CN 201120392216 U CN201120392216 U CN 201120392216U CN 202333732 U CN202333732 U CN 202333732U
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Abstract
The utility model discloses a switching value output protection circuit which comprises a programmable logic circuit, a latch circuit, a comparison circuit, a diode and a power driving circuit, wherein the latch circuit comprises a first resistor, a second resistor and a latch; the comparison circuit comprises a comparator, a reference voltage source, a third resistor and a fourth resistor; the power driving circuit comprises a triode, a user load and a fifth resistor; and the programmable logic circuit is a central processor, a complex programmable logic device or a field programmable gate array. The switching value output protection circuit has rapid response speed, and high flexibility and accuracy, and can operate normally through eliminating the faults of the switching value output circuit, any device is not required to be replaced, and maintaining is not required.
Description
Technical field
The utility model relates to a kind of circuit, and more particularly, the utility model relates to a kind of switching value output protection circuit.
Background technology
Widely used in the market electric controller does not generally have the switching value output protection circuit; Break down at user load electrical equipment, during the human operational error, cause very easily that the switching value output circuit damages, subscriber equipment damages and operating personnel's personal safety accident.The minority electric control system is used from recovering the insurance device, still adopts principle of expanding with heat and contracting with cold from recovering the insurance device more, and being quick on the draw property is relatively poor; Moment appears in fault; The switching value output circuit damages, does not break off yet and recover the insurance device certainly, does not have protective effect.Simultaneously, the switching value output circuit causes and changes components and parts, keeps in repair inconvenient in case damage needs to remove electric control system to analyze, to search failure cause.
Summary of the invention
The technical problem that the utility model will solve provides a kind of switching value output protection circuit, and not only reaction speed is fast for it, and can operate as normal after getting rid of switching value output circuit fault, need not change any components and parts, need not safeguard.
The technical scheme of the utility model is following:
A kind of switching value output protection circuit; Comprise PLD; Latch cicuit, comparison circuit, diode and power driving circuit; Latch cicuit comprises first resistance, second resistance and latch, and comparison circuit comprises comparator, reference voltage source, the 3rd resistance and the 4th resistance, and power driving circuit comprises triode, user load and the 5th resistance.First output pin of PLD links to each other with an end of first resistance, and second output pin of PLD links to each other with the input end of clock of latch, and the 3rd output pin of PLD links to each other with the clear terminal of latch; The input pin of PLD links to each other with the output of comparator, and the other end of first resistance links to each other with the data input pin of latch, and an end of second resistance links to each other with the data output end of latch; The other end links to each other with the base stage of triode; The 3rd resistance becomes the series connection potential-divider network with the 4th resistor group, an end of series connection potential-divider network links to each other other end ground connection with the in-phase input end of comparator; Series connection dividing point M links to each other with the negative electrode of diode; The positive pole of reference voltage source links to each other with the inverting input of comparator, and minus earth, the emitter of triode link to each other with the anode of diode and an end of the 5th resistance respectively; The other end ground connection of the 5th resistance, the collector electrode of triode links to each other with user load.
PLD is central processing unit, CPLD or field programmable gate array.
The beneficial effect of the utility model is: this switching value output protection circuit reaction speed is fast, and sensitivity, accuracy are high, and getting rid of switching value output circuit fault can operate as normal, need not change any device, need not safeguard.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is done further detailed explanation:
Fig. 1 is the circuit theory diagrams of the utility model.
Embodiment
As shown in Figure 1, the switching value output protection circuit of the utility model comprises: PLD 1, latch cicuit 2, comparison circuit 3, diode circuit 4 and power driving circuit 5.
Diode circuit 4 comprises switching diode D1.
The first output pin Outpin1 of PLD 1 links to each other with an end of first resistance R 1; The second output pin OutPin2 of PLD 1 links to each other with the input end of clock CLK of latch IC1; The 3rd output pin OutPin3 of PLD 1 links to each other with the clear terminal CLR of latch IC1, and the input pin Inpin of PLD 1 links to each other with the output comp1 of comparator IC2.
The other end of first resistance R 1 links to each other with the data input pin D of latch IC1, and an end of second resistance R 2 links to each other with the data output end Q of latch IC1, and the other end links to each other with the base stage of triode V1.
The 3rd resistance R 3 is formed the potential-divider network of connecting with the 4th resistance R 4, and an end of series connection potential-divider network links to each other with the in-phase input end comp3 of comparator IC2, other end ground connection, and series connection dividing point M links to each other with the negative electrode of switching diode D1.
The positive pole of reference voltage source Vref links to each other minus earth with the inverting input comp2 of comparator IC2.
The emitter of triode V1 links to each other with the anode of switching diode D1 and an end of the 5th resistance R 5 respectively, the other end ground connection of the 5th resistance R 5, and the collector electrode of triode V1 links to each other with user load RL.
In this execution mode, PLD 1 is central processing unit, CPLD or field programmable gate array.
The operation principle of the utility model is following:
Obtain the current signal of user load RL in triode V1 and the 5th resistance R 5 junctions; The 5th resistance R 5 converts current signal into voltage signal Shortsam; Voltage signal Shortsam is input to the in-phase input end comp3 of comparator IC2 through diode D1, the 3rd resistance R 3; Comparator IC2 compares the voltage signal at normal phase input end comp3 place and the voltage swing of the reference voltage source Vref of inverting input comp2 place; The input Inpin of comparative result Shorttest input PLD 1, this moment, whether PLD 1 can in proper working order according to the value judges load RL of comparative result ShortTest.
Particularly; When from the current value of user load RL≤100mA; Voltage signal Shortsam≤1.5V; Be input to the voltage signal≤0.8V behind the in-phase input end comp3 of comparator IC2 through switching diode D1, the 3rd resistance R 3, the magnitude of voltage ≈ 1.3V of reference voltage source Vref, comparator IC2 output comparative result voltage signal Shorttest=0V; PLD 1 judges load RL is in normal operating conditions, and the switching value output state signal of the collector electrode of triode V1 is determined by user application.
When user load RL short circuit, rise immediately from the voltage signal Shortsam of the 5th resistance R 5, the emitter voltage Ve of triode V1 rises; The base stage of triode V1 and the junction voltage Vbe＜0V between the emitter, this moment triode V1 base current Ib=0, triode V1 is operated in cut-off state; Simultaneously, because Shortsam rises the voltage of the voltage signal at normal phase input end comp3 place＞reference voltage source Vref immediately; Make that comparative result Shorttest is a high level; This moment, PLD 1 judges load RL was in abnormal working position, and the output Outpin3 output low level signal Outen of PLD 1 is to the clear terminal CLR of latch IC1, made the data output end Q output low level signal of latch IC1; The base current Ib=0 of triode V1; This has guaranteed that further triode V1 is operated in cut-off state, and the collector electrode output current Ic=0 of triode V1, triode V1 collector electrode power consumption Pc=0.At this moment, the current circuit of user load RL breaks off, thereby protection switch amount output circuit, especially subscriber equipment are not damaged.
Claims (2)
1. switching value output protection circuit; Comprise PLD, latch cicuit, comparison circuit, diode and power driving circuit; Said latch cicuit comprises first resistance, second resistance and latch; Said comparison circuit comprises comparator, reference voltage source, the 3rd resistance and the 4th resistance, and said power driving circuit comprises triode, user load and the 5th resistance, it is characterized in that:
First output pin of said PLD links to each other with an end of said first resistance;
Second output pin of said PLD links to each other with the input end of clock of said latch;
The 3rd output pin of said PLD links to each other with the clear terminal of said latch;
The input pin of said PLD links to each other with the output of said comparator,
The other end of said first resistance links to each other with the data input pin of said latch;
One end of said second resistance links to each other with the data output end of said latch, and the other end links to each other with the base stage of said triode;
Said the 3rd resistance becomes the series connection potential-divider network with said the 4th resistor group, an end of said series connection potential-divider network links to each other with the in-phase input end of said comparator, other end ground connection, and series connection dividing point M links to each other with the negative electrode of said diode;
The positive pole of said reference voltage source links to each other minus earth with the inverting input of said comparator;
The emitter of said triode links to each other with the anode of said diode and an end of said the 5th resistance respectively;
The other end ground connection of said the 5th resistance;
The collector electrode of said triode links to each other with said user load.
2. switching value output protection circuit according to claim 1 is characterized in that: said PLD is central processing unit, CPLD or field programmable gate array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120392216 CN202333732U (en) | 2011-10-14 | 2011-10-14 | Switching value output protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120392216 CN202333732U (en) | 2011-10-14 | 2011-10-14 | Switching value output protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202333732U true CN202333732U (en) | 2012-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120392216 Expired - Lifetime CN202333732U (en) | 2011-10-14 | 2011-10-14 | Switching value output protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202333732U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983720A (en) * | 2012-11-30 | 2013-03-20 | 西安智海电力科技有限公司 | Safe output-current-limiting automatic polarity identification directional power switching circuit |
-
2011
- 2011-10-14 CN CN 201120392216 patent/CN202333732U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983720A (en) * | 2012-11-30 | 2013-03-20 | 西安智海电力科技有限公司 | Safe output-current-limiting automatic polarity identification directional power switching circuit |
| CN102983720B (en) * | 2012-11-30 | 2015-01-21 | 西安智海电力科技有限公司 | Safe output-current-limiting automatic polarity identification directional power switching circuit |
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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 |
Granted publication date: 20120711 |
|
| CX01 | Expiry of patent term |