CN204423222U - A kind of D.C. regulated power supply current foldback circuit - Google Patents
A kind of D.C. regulated power supply current foldback circuit Download PDFInfo
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- CN204423222U CN204423222U CN201520126103.2U CN201520126103U CN204423222U CN 204423222 U CN204423222 U CN 204423222U CN 201520126103 U CN201520126103 U CN 201520126103U CN 204423222 U CN204423222 U CN 204423222U
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Abstract
The utility model discloses a kind of D.C. regulated power supply current foldback circuit, comprising the relay protection circuit with two input ends and four output terminals and being connected on D.C. regulated power supply is current sampling circuit in the current supply circuit of load supplying, described current sampling circuit is connected with over-current detection circuit, the output terminal of described over-current detection circuit connects with relay protection circuit input end, another input end of described relay protection circuit connects with the link of the output terminal of current sampling circuit and the input end of over-current detection circuit, first output terminal of described relay protection circuit is connected to load, second output terminal is unsettled, 3rd output terminal is unsettled, 4th output terminal is connected with sound light alarming circuit, the utility model is novel in design, structure is simple, there is real-time detection line current data and under overcurrent condition the function of sound and light alarm, protection direct supply is not damaged, the equipment simultaneously yet worked in protection circuit is not damaged, practical.
Description
Technical field
The utility model belongs to electronic circuit technology field, is specifically related to a kind of D.C. regulated power supply current foldback circuit.
Background technology
Society electronic equipment brings great convenience to the life of people, and any electronic equipment or load all could normally must work whether great or small under the support of power circuit.D.C. regulated power supply is applied comparatively extensive in scientific research, experimental teaching and daily life, when the factors such as environment temperature, load or input voltage change, the output voltage electric current of D.C. regulated power supply is all likely made to change, in daily use, due to some artificial origins or power supply self reason, power supply exports and there will be out-of-control phenomenon, and load reduces suddenly to cause D.C. regulated power supply output current to increase; Under abnormal state appears in power supply, export, direct supply can not only be protected not to be damaged if can cut off it timely and effectively, the equipment simultaneously yet worked in protection circuit is not damaged, reduces unnecessary economic loss.D.C. regulated power supply current foldback circuit many employings current transformer acquisition circuit current data conventional at present, by the data of singlechip microcontroller process collection conditioning, cost is high, programme loaded down with trivial details, regulate during current threshold and need rerun routine, control method is complicated, unnecessary trouble is brought to user, therefore, nowadays a kind of structure is lacked simple, cost is low, be convenient to install and lay easy to operate D.C. regulated power supply current foldback circuit, by sampling resistor acquisition circuit electric current, variable resistor is used to regulate current threshold size, the real-time switching circuit of dpdt relay, protection D.C. regulated power supply and load are not damaged, remind user to investigate fault in time by sound light alarming circuit simultaneously, solve existing current foldback circuit complicated operation, cost is high, the problem such as to programme loaded down with trivial details.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned deficiency of the prior art; a kind of D.C. regulated power supply current foldback circuit is provided; it is rationally novel in design; structure is simple, and action is fast, there is real-time detection line current data and under overcurrent condition the function of sound and light alarm; protection direct supply is not damaged; the equipment simultaneously yet worked in protection circuit is not damaged, practical, is convenient to promote the use of.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of D.C. regulated power supply current foldback circuit, it is characterized in that: comprising the relay protection circuit with two input ends and four output terminals and being connected on D.C. regulated power supply is current sampling circuit in the current supply circuit of load supplying, described current sampling circuit is connected with over-current detection circuit, the output terminal of described over-current detection circuit connects with relay protection circuit input end, another input end of described relay protection circuit connects with the link of the output terminal of current sampling circuit and the input end of over-current detection circuit, first output terminal of described relay protection circuit is connected to load, second output terminal of relay protection circuit is unsettled, 3rd output terminal of relay protection circuit is unsettled, 4th output terminal of relay protection circuit is connected with sound light alarming circuit,
Described current sampling circuit is resistance R0, described over-current detection circuit is by resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, variable resistor Rf, diode D1, diode D2, diode D3, polar capacitor C1 and operational amplifier LM258 forms, one end of described resistance R0 and the positive pole of D.C. regulated power supply+all connect with the in-phase input end of operational amplifier LM258, the other end of described resistance R0 is connected with the inverting input of operational amplifier LM258 by resistance R1, one end of described resistance R2, the anode of diode D1 and the negative electrode of diode D2 connect with the inverting input of operational amplifier LM258, the other end of described resistance R2, the negative electrode of diode D1 and the anode of diode D2 connect with the in-phase input end of operational amplifier LM258, the output terminal of described operational amplifier LM258 divides two-way, variable resistor Rf of leading up to connects with the inverting input of operational amplifier LM258, separately lead up to series connection resistance R3 and diode D3 connect with one end of resistance R5, the resistance R4 be connected in parallel and one end of polar capacitor C1 connect with the link of resistance R3 and diode D3, the resistance R4 be connected in parallel and the other end of polar capacitor C1 connect with the in-phase input end of operational amplifier LM258, the in-phase input end ground connection of described operational amplifier LM258, 8th pin of operational amplifier LM258 connects with+15V power output end, 4th pin of operational amplifier LM258 connects with-15V power output end.
Above-mentioned a kind of D.C. regulated power supply current foldback circuit, it is characterized in that: described relay protection circuit is by dpdt relay KA, sustained diode 4, reset key S1, resistance R6 and triode Q1 forms, described dpdt relay KA comprises a coil, two intermediate contacts, two normally closed contacts and two normally opened contacts, an intermediate contact 1 of dpdt relay KA is an input end of relay protection circuit and connects with the link of resistance R0 and resistance R1, a normally closed contact 2 of described dpdt relay KA is the first output terminal of relay protection circuit and connects with load one end, a normally opened contact 3 of described dpdt relay KA is the second output terminal of relay protection circuit, another intermediate contact 4 of described dpdt relay KA connects with one end of resistance R6, the other end of resistance R6 is another input end of relay protection circuit and connects with the link of the base stage of triode Q1 and the other end of resistance R5, the two ends of the coil of described dpdt relay KA connect with the collector of 12V power output end and triode Q1 respectively, the grounded emitter of triode Q1, described sustained diode 4 is connected in reverse parallel between the two ends of the coil of dpdt relay KA, one end of described reset key S1 connects with another normally opened contact 6 of dpdt relay KA, the other end of reset key S1 is the 4th output terminal of relay protection circuit and connects with 12V power output end, another normally closed contact 5 of described dpdt relay KA is the 3rd output terminal of relay protection circuit.
Above-mentioned a kind of D.C. regulated power supply current foldback circuit, is characterized in that: described sound light alarming circuit is made up of hummer LS1, light emitting diode DS1, resistance R7 and resistance R8; The anode of described hummer LS1 positive pole+and light emitting diode DS1 all connects with 12V power output end, hummer LS1 negative pole-connected with the collector of triode Q1 by resistance R7, the negative electrode of light emitting diode DS1 is connected with the collector of triode Q1 by resistance R8.
The utility model compared with prior art has the following advantages:
1, the utility model is by arranging the real-time switching circuit of relay protection circuit, dpdt relay is adopted to connect current supply circuit and sound light alarming circuit, when current supply circuit current data remains in setting threshold range, there is not over-current phenomenon avoidance, dpdt relay is communicated with load, D.C. regulated power supply provides stabilized power source for load, when power supply output is out of control or load reduces suddenly to cause D.C. regulated power supply output current to increase, when exceeding the current threshold of setting, load supplying is cut off in dpdt relay tripping operation, be communicated with sound light alarming circuit, user is reminded to investigate fault in time, circuit is simple, be swift in response.
2, the utility model by D.C. regulated power supply be load supplying loop in current sampling circuit is set, the loop current data of over-current detection circuit to current sampling circuit collection are set simultaneously and carry out signal amplification ratio comparatively, signal amplification factor is changed by regulating variable resistor resistance, when the current data gathered remains in setting threshold range, over-current detection circuit output low level, relay protection circuit is failure to actuate; When gather current data exceed setting threshold value time, over-current detection circuit export high level, drive triode ON, sound light alarming circuit work is ordered about in relay protection circuit action, protection D.C. regulated power supply and load not damaged, practical.
3, the utility model is rationally novel in design, and structure is simple, and cost is low, and volume is little, easy to operate, practical, is convenient to promote the use of.
In sum, the utility model is novel in design rationally, there is real-time detection line current data and under overcurrent condition the function of sound and light alarm; protection direct supply is not damaged; the equipment simultaneously yet worked in protection circuit is not damaged, practical, is convenient to promote the use of.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Description of reference numerals:
1-current sampling circuit; 2-over-current detection circuit; 3-relay protection circuit;
4-sound light alarming circuit.
Embodiment
As shown in Figure 1, the utility model comprises the relay protection circuit 3 with two input ends and four output terminals and is connected on D.C. regulated power supply is current sampling circuit 1 in the current supply circuit of load supplying, described current sampling circuit 1 is connected with over-current detection circuit 2, the output terminal of described over-current detection circuit 2 connects with an input end of relay protection circuit 3, the link of the input end of another input end of described relay protection circuit 3 and the output terminal of current sampling circuit 1 and over-current detection circuit 2 connects, first output terminal of described relay protection circuit 3 is connected to load, second output terminal of relay protection circuit 3 is unsettled, 3rd output terminal of relay protection circuit 3 is unsettled, 4th output terminal of relay protection circuit 3 is connected with sound light alarming circuit 4,
Described current sampling circuit 1 is resistance R0, described over-current detection circuit 2 is by resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, variable resistor Rf, diode D1, diode D2, diode D3, polar capacitor C1 and operational amplifier LM258 forms, one end of described resistance R0 and the positive pole of D.C. regulated power supply+all connect with the in-phase input end of operational amplifier LM258, the other end of described resistance R0 is connected with the inverting input of operational amplifier LM258 by resistance R1, one end of described resistance R2, the anode of diode D1 and the negative electrode of diode D2 connect with the inverting input of operational amplifier LM258, the other end of described resistance R2, the negative electrode of diode D1 and the anode of diode D2 connect with the in-phase input end of operational amplifier LM258, the output terminal of described operational amplifier LM258 divides two-way, variable resistor Rf of leading up to connects with the inverting input of operational amplifier LM258, separately lead up to series connection resistance R3 and diode D3 connect with one end of resistance R5, the resistance R4 be connected in parallel and one end of polar capacitor C1 connect with the link of resistance R3 and diode D3, the resistance R4 be connected in parallel and the other end of polar capacitor C1 connect with the in-phase input end of operational amplifier LM258, the in-phase input end ground connection of described operational amplifier LM258, 8th pin of operational amplifier LM258 connects with+15V power output end, 4th pin of operational amplifier LM258 connects with-15V power output end.
In the present embodiment, described relay protection circuit 3 is by dpdt relay KA, sustained diode 4, reset key S1, resistance R6 and triode Q1 forms, described dpdt relay KA comprises a coil, two intermediate contacts, two normally closed contacts and two normally opened contacts, an intermediate contact 1 of dpdt relay KA is an input end of relay protection circuit 3 and connects with the link of resistance R0 and resistance R1, a normally closed contact 2 of described dpdt relay KA is the first output terminal of relay protection circuit 3 and connects with load one end, a normally opened contact 3 of described dpdt relay KA is the second output terminal of relay protection circuit 3, another intermediate contact 4 of described dpdt relay KA connects with one end of resistance R6, the other end of resistance R6 is another input end of relay protection circuit 3 and connects with the link of the base stage of triode Q1 and the other end of resistance R5, the two ends of the coil of described dpdt relay KA connect with the collector of 12V power output end and triode Q1 respectively, the grounded emitter of triode Q1, described sustained diode 4 is connected in reverse parallel between the two ends of the coil of dpdt relay KA, one end of described reset key S1 connects with another normally opened contact 6 of dpdt relay KA, the other end of reset key S1 is the 4th output terminal of relay protection circuit 3 and connects with 12V power output end, another normally closed contact 5 of described dpdt relay KA is the 3rd output terminal of relay protection circuit 3.
In the present embodiment, described sound light alarming circuit 4 is made up of hummer LS1, light emitting diode DS1, resistance R7 and resistance R8; The anode of described hummer LS1 positive pole+and light emitting diode DS1 all connects with 12V power output end, hummer LS1 negative pole-connected with the collector of triode Q1 by resistance R7, the negative electrode of light emitting diode DS1 is connected with the collector of triode Q1 by resistance R8.
When the utility model uses, the current data of D.C. regulated power supply powering load is gathered by current sampling circuit 1, relay protection circuit 3 adopts dpdt relay to connect current supply circuit and sound light alarming circuit 4, utilize the current data of over-current detection circuit 2 examine and debug current sampling circuit 1 collection in real time simultaneously, when the current data gathered remains within the scope of setting current threshold, the comparatively rear output low level of over-current detection circuit 2 signal amplification ratio, triode Q1 is in cut-off state, relay protection circuit 3 is failure to actuate, an intermediate contact 1 of dpdt relay connects a normally closed contact 2, a normally opened contact 3 is unsettled, D.C. regulated power supply provides stabilized power source to load, another intermediate contact 4 of dpdt relay connects another normally closed contact 5, another normally closed contact 5 is unsettled, another normally opened contact 6 connects sound light alarming circuit 4 by reset key S1, when the current data gathered is greater than setting current threshold, high level is exported after over-current detection circuit 2 signal amplification ratio, triode Q1 conducting, dpdt relay adhesive, an intermediate contact 1 of dpdt relay connects a unsettled normally opened contact 3, cut off D.C. regulated power supply to the power supply of load, protection D.C. regulated power supply and load are not damaged, another intermediate contact 4 of dpdt relay connects another normally opened contact 6, sound light alarming circuit 4 conducting forms protection self-locking circuit, 12V power supply provides power supply for hummer and light emitting diode, sound and light alarm reminds user to investigate fault, work as failture evacuation, press reset key S1 circuit reset, result of use is good.
The above; it is only preferred embodiment of the present utility model; not the utility model is imposed any restrictions; every above embodiment is done according to the utility model technical spirit any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solutions of the utility model.
Claims (3)
1. a D.C. regulated power supply current foldback circuit, it is characterized in that: comprising the relay protection circuit (3) with two input ends and four output terminals and being connected on D.C. regulated power supply is current sampling circuit (1) in the current supply circuit of load supplying, described current sampling circuit (1) is gone up and is connected with over-current detection circuit (2), the output terminal of described over-current detection circuit (2) connects with an input end of relay protection circuit (3), the link of the input end of another input end of described relay protection circuit (3) and the output terminal of current sampling circuit (1) and over-current detection circuit (2) connects, first output terminal of described relay protection circuit (3) is connected to load, second output terminal of relay protection circuit (3) is unsettled, 3rd output terminal of relay protection circuit (3) is unsettled, 4th output terminal of relay protection circuit (3) is connected with sound light alarming circuit (4),
Described current sampling circuit (1) is resistance R0, described over-current detection circuit (2) is by resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, variable resistor Rf, diode D1, diode D2, diode D3, polar capacitor C1 and operational amplifier LM258 forms, one end of described resistance R0 and the positive pole of D.C. regulated power supply+all connect with the in-phase input end of operational amplifier LM258, the other end of described resistance R0 is connected with the inverting input of operational amplifier LM258 by resistance R1, one end of described resistance R2, the anode of diode D1 and the negative electrode of diode D2 connect with the inverting input of operational amplifier LM258, the other end of described resistance R2, the negative electrode of diode D1 and the anode of diode D2 connect with the in-phase input end of operational amplifier LM258, the output terminal of described operational amplifier LM258 divides two-way, variable resistor Rf of leading up to connects with the inverting input of operational amplifier LM258, separately lead up to series connection resistance R3 and diode D3 connect with one end of resistance R5, the resistance R4 be connected in parallel and one end of polar capacitor C1 connect with the link of resistance R3 and diode D3, the resistance R4 be connected in parallel and the other end of polar capacitor C1 connect with the in-phase input end of operational amplifier LM258, the in-phase input end ground connection of described operational amplifier LM258, 8th pin of operational amplifier LM258 connects with+15V power output end, 4th pin of operational amplifier LM258 connects with-15V power output end.
2. according to a kind of D.C. regulated power supply current foldback circuit according to claim 1, it is characterized in that: described relay protection circuit (3) is by dpdt relay KA, sustained diode 4, reset key S1, resistance R6 and triode Q1 forms, described dpdt relay KA comprises a coil, two intermediate contacts, two normally closed contacts and two normally opened contacts, an intermediate contact 1 of dpdt relay KA is an input end of relay protection circuit (3) and connects with the link of resistance R0 and resistance R1, a normally closed contact 2 of described dpdt relay KA is the first output terminal of relay protection circuit (3) and connects with load one end, a normally opened contact 3 of described dpdt relay KA is the second output terminal of relay protection circuit (3), another intermediate contact 4 of described dpdt relay KA connects with one end of resistance R6, the other end of resistance R6 is another input end of relay protection circuit (3) and connects with the link of the base stage of triode Q1 and the other end of resistance R5, the two ends of the coil of described dpdt relay KA connect with the collector of 12V power output end and triode Q1 respectively, the grounded emitter of triode Q1, described sustained diode 4 is connected in reverse parallel between the two ends of the coil of dpdt relay KA, one end of described reset key S1 connects with another normally opened contact 6 of dpdt relay KA, the other end of reset key S1 is the 4th output terminal of relay protection circuit (3) and connects with 12V power output end, another normally closed contact 5 of described dpdt relay KA is the 3rd output terminal of relay protection circuit (3).
3. according to a kind of D.C. regulated power supply current foldback circuit according to claim 2, it is characterized in that: described sound light alarming circuit (4) is made up of hummer LS1, light emitting diode DS1, resistance R7 and resistance R8; The anode of described hummer LS1 positive pole+and light emitting diode DS1 all connects with 12V power output end, hummer LS1 negative pole-connected with the collector of triode Q1 by resistance R7, the negative electrode of light emitting diode DS1 is connected with the collector of triode Q1 by resistance R8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520126103.2U CN204423222U (en) | 2015-03-04 | 2015-03-04 | A kind of D.C. regulated power supply current foldback circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520126103.2U CN204423222U (en) | 2015-03-04 | 2015-03-04 | A kind of D.C. regulated power supply current foldback circuit |
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| CN204423222U true CN204423222U (en) | 2015-06-24 |
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| CN201520126103.2U Expired - Fee Related CN204423222U (en) | 2015-03-04 | 2015-03-04 | A kind of D.C. regulated power supply current foldback circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443502A (en) * | 2016-12-06 | 2017-02-22 | 江苏理工学院 | High-precision power supply ground floating port current detection and protection circuit |
| WO2019085256A1 (en) * | 2017-11-01 | 2019-05-09 | 深圳光峰科技股份有限公司 | Power amplification circuit, power amplifier, and laser television |
| CN109950881A (en) * | 2019-03-29 | 2019-06-28 | 成都信息工程大学 | A kind of embeddable type equipment preliminary examination protection circuit |
| CN113093045A (en) * | 2021-04-06 | 2021-07-09 | 广东电网有限责任公司 | Power quality monitoring device, system and method for alternating current-direct current conversion power supply |
-
2015
- 2015-03-04 CN CN201520126103.2U patent/CN204423222U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443502A (en) * | 2016-12-06 | 2017-02-22 | 江苏理工学院 | High-precision power supply ground floating port current detection and protection circuit |
| CN106443502B (en) * | 2016-12-06 | 2019-02-15 | 江苏理工学院 | The current detecting and protection circuit of a kind of high-precision power floating ground port |
| WO2019085256A1 (en) * | 2017-11-01 | 2019-05-09 | 深圳光峰科技股份有限公司 | Power amplification circuit, power amplifier, and laser television |
| CN109950881A (en) * | 2019-03-29 | 2019-06-28 | 成都信息工程大学 | A kind of embeddable type equipment preliminary examination protection circuit |
| CN109950881B (en) * | 2019-03-29 | 2024-04-09 | 成都信息工程大学 | Embedded equipment pre-detection protection circuit |
| CN113093045A (en) * | 2021-04-06 | 2021-07-09 | 广东电网有限责任公司 | Power quality monitoring device, system and method for alternating current-direct current conversion power supply |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150624 Termination date: 20160304 |
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| CF01 | Termination of patent right due to non-payment of annual fee |