CN104502845A - Over-current protection type electric quantity detection circuit - Google Patents
Over-current protection type electric quantity detection circuit Download PDFInfo
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- CN104502845A CN104502845A CN201410661350.2A CN201410661350A CN104502845A CN 104502845 A CN104502845 A CN 104502845A CN 201410661350 A CN201410661350 A CN 201410661350A CN 104502845 A CN104502845 A CN 104502845A
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Abstract
The invention discloses an over-current protection type electric quantity detection circuit. The over-current protection type electric quantity detection circuit comprises a socket, a comparator A2, a comparator A1, a comparator A, a diode D1, a light emitting diode D3, a fuse B, a single-pole double-throw switch S, resistors R2 and R3, a capacitor C2 and a charging capacitor C3, wherein the socket, the diode D1, the resistor R2, an a end of the single-pole double-throw switch S, a b end of the single-pole double-throw switch S, a resistor R1, the resistor R3 and the light emitting diode D3 are sequentially connected, the light emitting diode D3 is in grounding connection, two ends of the resistor R2 are respectively connected with a non-inverted input end and an inverted input end of the comparator A2, an output end of the comparator A2 is connected with the a end of the single-pole double-throw switch S, the socket is further connected with the resistor R1, the resistor R1 is further connected with a non-inverted input end of the comparator A1, an inverted input end of the comparator A1 is connected with a cathode of the diode D1, and an output end of the comparator A1 outputs signals. According to the over-current protection type electric quantity detection circuit, a special-purpose over-current protection structure is provided, the structure requires no frequent replacement, reduces cost and protects electric elements in the circuit to be in good state.
Description
Technical field
The present invention relates to testing circuit field, be specifically related to overcurrent protective electric quantity detecting circuit.
Background technology
Current cyberage, with the quickening pace of modern life, so the rhythm of our carry-on electric equipment also needs us to grasp at any time, use portable type electronic product, wish the remaining electricity can knowing battery at any time, the working time that can continue, and regulate related application accordingly, this will be a thing very easily undoubtedly.Battery electric quantity detection technique is of common occurrence in notebook computer, and most notebook computer has the option of power management, provides different power mode and battery alarm function.But in the portable product market of miniaturization more, this technology is but also rare.Nowadays need long-term replacing to increase cost for detecting the overcurrent protection structure arranged in the device of electricity, or lack overcurrent protection structure, easily burn out the electric elements in circuit.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, overcurrent protective electric quantity detecting circuit is provided, special overcurrent protection structure is set, and this structure is without the need to frequent replacing, reduces costs, and electric elements intact in protection circuit.
For solving above-mentioned technical matters, the present invention is by the following technical solutions: overcurrent protective electric quantity detecting circuit, comprise socket, comparer A2, comparer A1, comparer A, diode D1, light emitting diode D3, fuse B, single-pole double-throw switch (SPDT) S, resistance R2, resistance R3, electric capacity C2 and charging capacitor C3, described socket, diode D1, resistance R2, the a end of single-pole double-throw switch (SPDT) S, the b end of single-pole double-throw switch (SPDT) S, resistance R1, resistance R3 is connected successively with light emitting diode D3, light emitting diode D3 ground connection wherein, input end in the same way and the reverse input end of comparer A2 is connected respectively at resistance R2 two ends, the output terminal of comparer A2 connects a end of single-pole double-throw switch (SPDT) S, described socket is contact resistance R1 also, and resistance R1 also connects the input end in the same way of comparer A1, and the reverse input end of comparer A1 connects the negative pole of diode D1, the output terminal output signal of comparer A1, described resistance R1 and the common port of diode D1 are also connected the reverse input end of comparer A and the c end of single-pole double-throw switch (SPDT) S successively, the common port that described resistance R3 and the b of single-pole double-throw switch (SPDT) S hold also is connected drop-down electric capacity C2 and drop-down charging capacitor C3, the input end grounding in the same way of described comparer A, the output terminal of comparer A is held with the c of single-pole double-throw switch (SPDT) S and is connected.
After socket inserting power supply circuit energising, the voltage in the same way between input end and reverse input end of comparer A1 reduce on the occasion of, export high level at the output terminal of comparer A1.Simultaneously due to socket inserting power supply, the a end of diode D1, resistance R2, single-pole double-throw switch (SPDT) and b end, the loop that resistance R3 and light emitting diode D3 connects to form successively is connected, and diode D3 is luminous, now drop-down charging capacitor C3 two ends charging, electric capacity C2 is then for the unwanted ripple of filtering.After charging capacitor C3 charging complete, charging capacitor C3 then can discharge, the pressure drop at diode D1 two ends is disappeared, thus make the output terminal of comparer A1 be low level, the a end of single-pole double-throw switch (SPDT) S and c termination are led to, load R3 and light emitting diode D3 powers by charging capacitor C3, the a end of single-pole double-throw switch (SPDT) is connected with c end simultaneously, comparer A and power supply are connected, the input terminal voltage in the same way of comparer A1 is raised, the reverse input end voltage of comparer A1 reduces, thus make the output terminal of comparer A1 become high level again, the a end of single-pole double-throw switch (SPDT) and b termination are led to, the like circulate.When input voltage is excessive, fuse B also can disconnecting circuit, avoids light emitting diode below to damage.The power of power supply electricity can be detected by the bright-dark degree observing light emitting diode D3 luminescence, detect quick and convenient.
Input end in the same way and the reverse input end of comparer A2 is connected respectively at the two ends of resistance R2, the output terminal of comparer A2 also connects a end of single-pole double-throw switch (SPDT) S simultaneously, when the electric current flowing through resistance R2 two ends is excessive, the pressure drop at resistance R2 two ends is larger, the output terminal of comparer A2 exports high level, the a end of single-pole double-throw switch (SPDT) is separated with b end and a of single-pole double-throw switch (SPDT) end is also separated with c end, loop disconnects, and avoids excessive electric current to burn out electronic component light emitting diode in circuit and charging capacitor C3.And this structure is without the need to frequent replacing, can Reusability, reduce costs, and electric elements intact in protection circuit.
The input end in the same way of described comparer A2 is connected with the negative pole of diode D1, and the reverse input end of comparer A2 is held with a of single-pole double-throw switch (SPDT) S and is connected.With diode D1 with the use of, realize better metering function.
The a end of described single-pole double-throw switch (SPDT) S is also connected drop-down voltage stabilizing diode D2 with the common port of fuse B, the forward end ground connection of diode D2.Make circuit supply voltage more stable.
Described socket also connects drop-down electric capacity C1.For filtering out interference wave, avoid interference the impact of ripple on circuit.
The forward power end link of described comparer A also connects drop-down electric capacity C4.For the undesired signal of filtering near single-pole double-throw switch (SPDT).
Compared with prior art, the invention has the beneficial effects as follows:
1, special overcurrent protection part is set in the circuit, when the electric current flowing through resistance R2 two ends is excessive, then comparer A2 makes single-pole double-throw switch (SPDT) disconnect, thus reaches the effect of light emitting diode and charging voltage in protection circuit, avoids being burnt out by excessive electric current; And this structure is without the need to frequent replacing, can Reusability, reduce costs, and electric elements intact in protection circuit.
2, a end of single-pole double-throw switch (SPDT) S is also connected drop-down voltage stabilizing diode D2 with the common port of fuse B, the forward end ground connection of diode D2, makes circuit supply voltage more stable.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further elaborated, and embodiments of the invention are not limited thereto.
Embodiment 1:
As shown in Figure 1, the present invention includes socket, comparer A2, comparer A1, comparer A, diode D1, light emitting diode D3, fuse B, single-pole double-throw switch (SPDT) S, resistance R2, resistance R3 is 4.7 kilo-ohms, electric capacity C2 is 0.1 microfarad and charging capacitor C3 is 220 microfarad/16 volt, described socket, diode D1, resistance R2, the a end of single-pole double-throw switch (SPDT) S, the b end of single-pole double-throw switch (SPDT) S, resistance R1, resistance R3 is connected successively with light emitting diode D3, light emitting diode D3 ground connection wherein, input end in the same way and the reverse input end of comparer A2 is connected respectively at resistance R2 two ends, the output terminal of comparer A2 connects a end of single-pole double-throw switch (SPDT) S, described socket is contact resistance R1 also, and resistance R1 also connects the input end in the same way of comparer A1, and the reverse input end of comparer A1 connects the negative pole of diode D1, the output terminal output signal of comparer A1, described resistance R1 and the common port of diode D1 are also connected the reverse input end of comparer A and the c end of single-pole double-throw switch (SPDT) S successively, the common port that described resistance R3 and the b of single-pole double-throw switch (SPDT) S hold also is connected drop-down electric capacity C2 and drop-down charging capacitor C3, the input end grounding in the same way of described comparer A, the output terminal of comparer A is held with the c of single-pole double-throw switch (SPDT) S and is connected.Wherein comparer model is MC74VHC1GT125DT, and the size of drop-down electric capacity C2 is 0.1 microfarad.
After socket inserting power supply circuit energising, the voltage in the same way between input end and reverse input end of comparer A1 reduce on the occasion of, export high level at the output terminal of comparer A1.Simultaneously due to socket inserting power supply, the a end of diode D1, resistance R2, single-pole double-throw switch (SPDT) and b end, the loop that resistance R3 and light emitting diode D3 connects to form successively is connected, and diode D3 is luminous, now drop-down charging capacitor C3 two ends charging, electric capacity C2 is then for the unwanted ripple of filtering.After charging capacitor C3 charging complete, charging capacitor C3 then can discharge, the pressure drop at diode D1 two ends is disappeared, thus make the output terminal of comparer A1 be low level, the a end of single-pole double-throw switch (SPDT) S and c termination are led to, load R3 and light emitting diode D3 powers by charging capacitor C3, the a end of single-pole double-throw switch (SPDT) is connected with c end simultaneously, comparer A and power supply are connected, the input terminal voltage in the same way of comparer A1 is raised, the reverse input end voltage of comparer A1 reduces, thus make the output terminal of comparer A1 become high level again, the a end of single-pole double-throw switch (SPDT) and b termination are led to, the like circulate.When input voltage is excessive, fuse B also can disconnecting circuit, avoids light emitting diode below to damage.The power of power supply electricity can be detected by the bright-dark degree observing light emitting diode D3 luminescence, detect quick and convenient.
Input end in the same way and the reverse input end of comparer A2 is connected respectively at the two ends of resistance R2, the output terminal of comparer A2 also connects a end of single-pole double-throw switch (SPDT) S simultaneously, when the electric current flowing through resistance R2 two ends is excessive, the pressure drop at resistance R2 two ends is larger, the output terminal of comparer A2 exports high level, the a end of single-pole double-throw switch (SPDT) is separated with b end and a of single-pole double-throw switch (SPDT) end is also separated with c end, loop disconnects, and avoids excessive electric current to burn out electronic component light emitting diode in circuit and charging capacitor C3.And this structure is without the need to frequent replacing, can Reusability, reduce costs, and electric elements intact in protection circuit.
Embodiment 2:
The present embodiment is preferably as follows on the basis of embodiment 1: the input end in the same way of described comparer A2 is connected with the negative pole of diode D1, and the reverse input end of comparer A2 is held with a of single-pole double-throw switch (SPDT) S and is connected.With diode D1 with the use of, realize better metering function.
The a end of described single-pole double-throw switch (SPDT) S is also connected drop-down voltage stabilizing diode D2 with the common port of fuse B, the forward end ground connection of diode D2.Make circuit supply voltage more stable.
Described socket also connects drop-down electric capacity C1, size is 0.1 microfarad.For filtering out interference wave, avoid interference the impact of ripple on circuit.
The forward power end link of described comparer A also connects drop-down electric capacity C4.
Just this invention can be realized as mentioned above.
Claims (5)
1. overcurrent protective electric quantity detecting circuit, it is characterized in that: comprise socket, comparer A2, comparer A1, comparer A, diode D1, light emitting diode D3, fuse B, single-pole double-throw switch (SPDT) S, resistance R2, resistance R3, electric capacity C2 and charging capacitor C3, described socket, diode D1, resistance R2, the a end of single-pole double-throw switch (SPDT) S, the b end of single-pole double-throw switch (SPDT) S, resistance R3 is connected successively with light emitting diode D3, light emitting diode D3 ground connection wherein, input end in the same way and the reverse input end of comparer A2 is connected respectively at resistance R2 two ends, the output terminal of comparer A2 connects a end of single-pole double-throw switch (SPDT) S, described socket is contact resistance R1 also, and resistance R1 also connects the input end in the same way of comparer A1, and the reverse input end of comparer A1 connects the negative pole of diode D1, the output terminal output signal of comparer A1, described resistance R1 and the common port of diode D1 are also connected the reverse input end of comparer A and the c end of single-pole double-throw switch (SPDT) S successively, the common port that described resistance R3 and the b of single-pole double-throw switch (SPDT) S hold also is connected drop-down electric capacity C2 and drop-down charging capacitor C3, the input end grounding in the same way of described comparer A, the output terminal of comparer A is held with the c of single-pole double-throw switch (SPDT) S and is connected.
2. overcurrent protective electric quantity detecting circuit according to claim 1, is characterized in that: the input end in the same way of described comparer A2 is connected with the negative pole of diode D1, and the reverse input end of comparer A2 is held with a of single-pole double-throw switch (SPDT) S and is connected.
3. overcurrent protective electric quantity detecting circuit according to claim 1, is characterized in that: a end of described single-pole double-throw switch (SPDT) S is also connected drop-down voltage stabilizing diode D2 with the common port of fuse B, the forward end ground connection of diode D2.
4. overcurrent protective electric quantity detecting circuit according to claim 1, is characterized in that: described socket also connects drop-down electric capacity C1.
5. overcurrent protective electric quantity detecting circuit according to claim 1, is characterized in that: the forward power end link of described comparer A also connects drop-down electric capacity C4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410661350.2A CN104502845A (en) | 2014-11-19 | 2014-11-19 | Over-current protection type electric quantity detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410661350.2A CN104502845A (en) | 2014-11-19 | 2014-11-19 | Over-current protection type electric quantity detection circuit |
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| Publication Number | Publication Date |
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| CN104502845A true CN104502845A (en) | 2015-04-08 |
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| CN201410661350.2A Pending CN104502845A (en) | 2014-11-19 | 2014-11-19 | Over-current protection type electric quantity detection circuit |
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Citations (6)
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|---|---|---|---|---|
| US20090230972A1 (en) * | 2008-03-12 | 2009-09-17 | O2Micro, Inc. | Capacity detector for detecting capacity of an energy storage unit |
| CN101567475A (en) * | 2008-04-22 | 2009-10-28 | 天津泛海科技有限公司 | Lithium battery/battery pack measuring and protecting method based on current subsection detecting technique |
| CN203387214U (en) * | 2013-06-17 | 2014-01-08 | 安科智慧城市技术（中国）有限公司 | Automobile emergency starting power supply and automobile power supply device |
| CN103760491A (en) * | 2014-01-06 | 2014-04-30 | 华南理工大学 | Electric quantity monitoring method and device for digital storage battery |
| CN103872736A (en) * | 2014-03-24 | 2014-06-18 | 华南师范大学 | Protected charging circuit capable of displaying electric quantity |
| CN204256043U (en) * | 2014-11-19 | 2015-04-08 | 成都嵌智捷科技有限公司 | There is the electric quantity detecting circuit of overcurrent protection |
-
2014
- 2014-11-19 CN CN201410661350.2A patent/CN104502845A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090230972A1 (en) * | 2008-03-12 | 2009-09-17 | O2Micro, Inc. | Capacity detector for detecting capacity of an energy storage unit |
| CN101567475A (en) * | 2008-04-22 | 2009-10-28 | 天津泛海科技有限公司 | Lithium battery/battery pack measuring and protecting method based on current subsection detecting technique |
| CN203387214U (en) * | 2013-06-17 | 2014-01-08 | 安科智慧城市技术（中国）有限公司 | Automobile emergency starting power supply and automobile power supply device |
| CN103760491A (en) * | 2014-01-06 | 2014-04-30 | 华南理工大学 | Electric quantity monitoring method and device for digital storage battery |
| CN103872736A (en) * | 2014-03-24 | 2014-06-18 | 华南师范大学 | Protected charging circuit capable of displaying electric quantity |
| CN204256043U (en) * | 2014-11-19 | 2015-04-08 | 成都嵌智捷科技有限公司 | There is the electric quantity detecting circuit of overcurrent protection |
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Application publication date: 20150408 |
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