CN203933592U - A kind of photoelectricity Isolation input Acquisition Circuit of low-power consumption - Google Patents
A kind of photoelectricity Isolation input Acquisition Circuit of low-power consumption Download PDFInfo
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- CN203933592U CN203933592U CN201420379622.5U CN201420379622U CN203933592U CN 203933592 U CN203933592 U CN 203933592U CN 201420379622 U CN201420379622 U CN 201420379622U CN 203933592 U CN203933592 U CN 203933592U
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- 238000002955 isolation Methods 0.000 title claims abstract description 49
- 230000005622 photoelectricity Effects 0.000 title claims abstract description 48
- 230000000087 stabilizing effect Effects 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 101100112673 Rattus norvegicus Ccnd2 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of photoelectricity Isolation input Acquisition Circuit of low-power consumption, the current-limiting control circuit that comprises the input that is serially connected in photoelectricity Isolation input Acquisition Circuit, the cut-off current value of current-limiting control circuit equals the starting current of photoelectricity Isolation input Acquisition Circuit, and the input current that current-limiting control circuit limits photoelectricity Isolation input Acquisition Circuit is not more than starting current.The utility model can effectively reduce photoelectricity Isolation input collection power consumption and reach 35% to 70%, and design cost is also lower, has a good application prospect.
Description
Technical field
The utility model relates to a kind of photoelectricity Isolation input Acquisition Circuit, especially a kind of photoelectricity Isolation input Acquisition Circuit with low power capabilities.
Background technology
Secondary equipment in power system need to gather the state of the power switchgear in primary equipment, and the method for collection adopts photoelectricity Isolation input circuit that switching value is converted into the digital signal that secondary device can be identified through electrical isolation conventionally.For high reliability (especially high voltage protective equipment); the common DC power supply with this equipment is as the input power (power supply of China's secondary equipment in power system is mostly 220V direct current) of switching value; the quantity gathering for some secondary device can reach 100-200 point; suppose that every road rated current is 2mA; power consumption reaches 44-88W, and this is totally unfavorable for leaning on the equipment of natural heat dissipation (requirement of electric power system).
The requirement gathering according to electric power system switch amount, starting resistor is less than 70% rated voltage, and return voltage is greater than 55% rated voltage, therefore the rated voltage of the general employing 62.5% of producer is as the zero boundary point that starts and return.In order to guarantee the reliable conducting of the upper optocoupler of Ling circle point, must in acquisition circuit, maintain certain electric current, be starting current, and electric current at least can reach the starting current of 1.6 times when reaching rated voltage, electric current has increased at least 60%, be that power consumption has also just increased at least 60%, this heat radiation to equipment is disadvantageous.
Summary of the invention
The technical problems to be solved in the utility model is existing photoelectricity Isolation input Acquisition Circuit when input voltage surpasses starting resistor and continues to increase, and input current also increases thereupon, thereby causes the power consumption of photoelectricity Isolation input Acquisition Circuit also to increase thereupon.
In order to solve the problems of the technologies described above, the utility model provides a kind of photoelectricity Isolation input Acquisition Circuit of low-power consumption, the current-limiting control circuit that comprises the input that is serially connected in photoelectricity Isolation input Acquisition Circuit, the cut-off current value of current-limiting control circuit equals the starting current of photoelectricity Isolation input Acquisition Circuit, and the input current that current-limiting control circuit limits photoelectricity Isolation input Acquisition Circuit is not more than starting current.
Adopt current-limiting control circuit to detect in real time the input current of photoelectricity Isolation input Acquisition Circuit, if input current reaches starting current, the input current of current-limiting control circuit restriction photoelectricity Isolation input Acquisition Circuit is starting current size, thereby effectively prevent that input current from increasing along with the increase of input voltage, realize the object that reduces photoelectricity Isolation input Acquisition Circuit power consumption.
As further restriction scheme of the present utility model, current-limiting control circuit comprises three end adjustable constant-flow element and regulating resistances, the input of three end adjustable constant-flow elements and output are serially connected in the input of photoelectricity Isolation input Acquisition Circuit by electric current positive direction, the two ends of regulating resistance are connected with output with the adjustable side of three end adjustable constant-flow elements respectively, and the resistance of regulating resistance is corresponding with the cut-off current value of three end adjustable constant-flow elements.Can set the resistance of regulating resistance, thereby meet the starting current requirement of different photoelectricity Isolation input Acquisition Circuit.
As further improvement of the utility model scheme, the input of current-limiting control circuit has also been connected in series one or more same current-limiting control circuits.Adopt two or more identical current-limiting control circuits to be serially connected in the input of photoelectricity Isolation input Acquisition Circuit, can effectively strengthen the rated voltage of input current limitation effect when larger, improve forward direction resistance to pressure.
As further improvement of the utility model scheme, current-limiting control circuit also comprises a voltage stabilizing didoe, and the positive pole of voltage stabilizing didoe is connected with the output of three end adjustable constant-flow elements, and the negative pole of voltage stabilizing didoe is connected with the input of three end adjustable constant-flow elements.Adopt voltage stabilizing didoe to carry out overvoltage protection to three end adjustable constant-flow elements.
The beneficial effects of the utility model are: adopt current-limiting control circuit to detect in real time the input current of photoelectricity Isolation input Acquisition Circuit, if input voltage is more than or equal to starting resistor, the input current of current-limiting control circuit restriction photoelectricity Isolation input Acquisition Circuit is starting current size, thereby effectively prevent that input current from increasing along with the increase of input voltage, realize the object that reduces photoelectricity Isolation input Acquisition Circuit power consumption.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model;
Fig. 2 is of the present utility model pair of current-limiting circuit structural representation;
Fig. 3 is that a kind of front end input gathers structural representation;
Fig. 4 is that another kind of front end input gathers structural representation.
Embodiment
As shown in Figure 1, the photoelectricity Isolation input Acquisition Circuit of low-power consumption of the present utility model comprises the current-limiting control circuit of the input that is serially connected in photoelectricity Isolation input Acquisition Circuit, the cut-off current value I of current-limiting control circuit
sETequal the starting current of photoelectricity Isolation input Acquisition Circuit, the input current that current-limiting control circuit limits photoelectricity Isolation input Acquisition Circuit is not more than starting current.
Adopt current-limiting control circuit to detect in real time the input current of photoelectricity Isolation input Acquisition Circuit, if input current is more than or equal to starting current, the input current of current-limiting control circuit restriction photoelectricity Isolation input Acquisition Circuit is starting current size, thereby effectively prevent that input current from increasing along with the increase of input voltage, realize the object that reduces photoelectricity Isolation input Acquisition Circuit power consumption.
As illustrated in fig. 1 and 2, current-limiting control circuit comprises three end adjustable constant-flow elements and regulating resistance R
sET, the input of three end adjustable constant-flow elements and output are serially connected in the input of photoelectricity Isolation input Acquisition Circuit by electric current positive direction, can adopt LM134 as three end adjustable constant-flow elements, regulating resistance R
sETtwo ends be connected with output with the adjustable side of three end adjustable constant-flow elements respectively, regulating resistance R
sETresistance and the cut-off current value I of three end adjustable constant-flow elements
sETcorresponding, if using LM134 as three end adjustable constant-flow element, R
sET=67.7/I
sET(R
sETunit is K Ω, I
sETunit is mA).Can be to regulating resistance R
sETresistance set, thereby meet the starting current requirement of different photoelectricity Isolation input Acquisition Circuit.
In order further to improve the forward direction resistance to pressure of circuit, the input of current-limiting control circuit has also been connected in series a same current-limiting control circuit.Adopt two identical current-limiting control circuits to be serially connected in the input of photoelectricity Isolation input Acquisition Circuit, can effectively strengthen the rated voltage of input current limitation effect when larger, the forward direction resistance to pressure of improved+Vin to Vin1.
In order to realize, three end adjustable constant-flow elements are carried out to overvoltage protection; current-limiting control circuit also comprises a voltage stabilizing didoe D1; the positive pole of voltage stabilizing didoe D1 is connected with the output of three end adjustable constant-flow elements, and the negative pole of voltage stabilizing didoe D1 is connected with the input of three end adjustable constant-flow elements.For LM134 (forward direction is withstand voltage for 40V), as for the circuit of three end adjustable constant-flow elements, the voltage stabilizing value of voltage stabilizing didoe D1 is chosen as 36V.Adopt voltage stabilizing didoe D1 to carry out overvoltage protection to three end adjustable constant-flow elements.
As Figure 1-4, existing photoelectricity Isolation input Acquisition Circuit is generally comprised of front end input acquisition circuit and photoisolator.Wherein, front end input acquisition circuit generally has two kinds of typical circuits, as shown in Figure 3, a kind of front end input acquisition circuit is in series by resistance R 1 and voltage stabilizing didoe D2, this circuit structure is comparatively simple, but power dissipation ratio is larger, after the input serial connection current-limiting control circuit of this circuit, can make power consumption reduce at least 70% when rated voltage is inputted; As shown in Figure 4, another kind of, front end input acquisition circuit is comprised of resistance R 1, resistance R 2 and voltage stabilizing didoe D2, one end connection+Vin of resistance R 1, the other end is connected with one end of resistance R 2 and the negative pole of voltage stabilizing didoe D2 respectively, the other end of resistance R 2 is connected with-Vin again, after the input serial connection current-limiting control circuit of this circuit, can make power-dissipation-reduced at least 35%.
The circuit of reduction photoelectricity Isolation input Acquisition Circuit power consumption of the present utility model is when work, and setting current-limiting control circuit comprises usings LM134 as three end adjustable constant-flow elements with R
sETas regulating resistance, when this current-limiting control circuit is concatenated into the input of photoelectricity Isolation input Acquisition Circuit, its input current is still controlled by outside input voltage.When outside input voltage improves, input current also improves accordingly, once reach the I that current-limiting control circuit is set
sETtime, i.e. the starting current of photoelectricity Isolation input Acquisition Circuit, electric current improves the raising no longer continuing with external input voltage, plays the effect of current limliting; When outside input voltage meets or exceeds starting resistor, (actual starting resistor is than the slightly high about 1V of the starting resistor of primary circuit, for high starting resistor (>48V)) use for, this variable effect to starting resistor is less, can ignore) time, current-limiting control circuit will play a role, Limited Current, on starting current, and maintains starting state until outside input voltage while reducing to lower than starting resistor.
More than show and described basic principle of the present utility model, principal character and advantage.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (4)
1. the photoelectricity Isolation input Acquisition Circuit of a low-power consumption, it is characterized in that, the current-limiting control circuit that comprises photoelectricity Isolation input Acquisition Circuit and be serially connected in the input of photoelectricity Isolation input Acquisition Circuit, the cut-off current value of described current-limiting control circuit equals the starting current of photoelectricity Isolation input Acquisition Circuit, and the input current that described current-limiting control circuit limits photoelectricity Isolation input Acquisition Circuit is not more than starting current.
2. the photoelectricity Isolation input Acquisition Circuit of low-power consumption according to claim 1, it is characterized in that, described current-limiting control circuit comprises three end adjustable constant-flow element and regulating resistances, the input of described three end adjustable constant-flow elements and output are serially connected in the input of photoelectricity Isolation input Acquisition Circuit by electric current positive direction, the two ends of described regulating resistance are connected with output with the adjustable side of three end adjustable constant-flow elements respectively, and the resistance of described regulating resistance is corresponding with the cut-off current value of three end adjustable constant-flow elements.
3. the photoelectricity Isolation input Acquisition Circuit of low-power consumption according to claim 1, is characterized in that, the input of described current-limiting control circuit has also been connected in series one or more same current-limiting control circuits.
4. the photoelectricity Isolation input Acquisition Circuit of low-power consumption according to claim 2, it is characterized in that, described current-limiting control circuit also comprises a voltage stabilizing didoe, the positive pole of described voltage stabilizing didoe is connected with the output of three end adjustable constant-flow elements, and the negative pole of described voltage stabilizing didoe is connected with the input of three end adjustable constant-flow elements.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420379622.5U CN203933592U (en) | 2014-07-09 | 2014-07-09 | A kind of photoelectricity Isolation input Acquisition Circuit of low-power consumption |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420379622.5U CN203933592U (en) | 2014-07-09 | 2014-07-09 | A kind of photoelectricity Isolation input Acquisition Circuit of low-power consumption |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065369A (en) * | 2014-07-09 | 2014-09-24 | 南京工业大学 | Method and circuit for reducing power consumption of photoelectric isolating input collecting circuit |
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2014
- 2014-07-09 CN CN201420379622.5U patent/CN203933592U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065369A (en) * | 2014-07-09 | 2014-09-24 | 南京工业大学 | Method and circuit for reducing power consumption of photoelectric isolating input collecting circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20150709 |
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| EXPY | Termination of patent right or utility model |