CN100449906C - Circuit arrangement capable of distinguishing polarity automatically and converting - Google Patents
Circuit arrangement capable of distinguishing polarity automatically and converting Download PDFInfo
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- CN100449906C CN100449906C CNB200410036939XA CN200410036939A CN100449906C CN 100449906 C CN100449906 C CN 100449906C CN B200410036939X A CNB200410036939X A CN B200410036939XA CN 200410036939 A CN200410036939 A CN 200410036939A CN 100449906 C CN100449906 C CN 100449906C
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Abstract
The present invention provides a circuit device which can automatically identify and convert polarities, and comprises a first identification testing circuit, a second identification testing circuit, a first changeover circuit, a second changeover circuit and a conversion activating circuit, wherein the input end of the circuit device is connected with a battery with high electric energy, and the output end of the circuit device is provided with two connection points connected to the positive pole and the negative pole of a battery with low electric energy. In a first connection state, the circuit device can switch on the first identification testing circuit and the first changeover circuit through automatic identification so that current is transferred to the battery with low electric energy from the battery with high electric energy; on the contrary, in a second connection state, the circuit device can switch on the second identification testing circuit and the second changeover circuit through automatic identification so that the current is transferred to the battery with low electric energy from the battery with high electric energy. Thus, the two connection points of the output end can be freely connected in parallel to the positive pole and the negative pole of the battery with low electric energy so as to achieve the effect of replenishing electric energy.
Description
Technical field
The present invention relates to a kind of circuit arrangement that can differentiate polarity and conversion automatically.Relate in particular to a kind of this circuit arrangement when being connected to a low electric energy storage battery, its inner circuit can be differentiated polarity and conversion circuit device automatically.
Background technology
Along with industrial technology develops rapidly, related stimulating economic growth and social prosperity, people's gained generally improves, consumption level also with raising, especially eating clothing lives the various lives of row and must consume especially so obvious improvement arranged, aspect just, the domestic automobile popularity rate has reached the situation of an average family one car at present, relative, therefore the market of automobile Related product promptly more enlarge, various product is constantly weeded out the old and bring forth the new, no matter be the variation on structural improvement or the external form, all makes the consumer more benefited; But under development in science and technology situation at a tremendous pace,, still have the space that to bring into play, thus, have only and constantly research and develop and improve, just the unlikely follower who becomes tomorrow though most product has been reached the ripe stage all.
In aforementioned automobile product, storage battery is for producing the indispensable product of power, and general automobile storage battery is difficult to start under the light current situation, can be connected to storage battery or other supply unit of other vehicle this moment by two rescue line parallels, and one connect and the storage battery electric weight can be full of or arrive the electric weight that can start at least by this; Yet, being connected in parallel that prior art is used exists many defectives, wherein, this storage battery must be considered the correctness of polarity when being connected in parallel, if be in comparatively pitch-dark dim place, or, the positive-negative polarity wrong is often arranged and produce spark, and the possibility of therefore blasting to the more inexplicit user of polarity discriminating, it is for real can not be ignored of psychological pressure that the user is produced when operating, and the utmost point has necessity of improvement.
And shown in annex one, structural improvement patent case for No. 521922 automobile storage battery emergency start device of TW Announcement Number, whether it mainly detects the polarity of the automobile storage battery of establishing that connects by a positive voltage testing circuit 55 and negative voltage detection circuit 56 correct, if detecting then can constitute a power circuit for positive voltage; If detecting then drives a buzzer B and moves with display abnormality for negative voltage.Though this prior art provides the whether differentiation of rescue line wrong with structure, however still must be more again and connect once, and also can cause user's nervous psychology during buzzer B caution, thus the structure of the prior art also non-be good.
And shown in annex two, be the US patent No. the 6th, 130, No. 519 patent cases, it has an automatic reverse of polarity switch 50, and this automatic reverse of polarity switch 50 is made up of coil set 51 and one switch set 53, wherein, the set 51 of this coil is by switch set 53 control starts, the contact terminal that floats on the three sections coils 60,62,64 by coil set 51, and utilize that spring supports, magnetic force repulsion phase is inhaled principle and reach the effect of the automatic reverse of polarity.The structure of the prior art is very easily because of elastic fatigue or because of the remanent magnetism relation causes the imbalance in magnetic field, thereby the generation misoperation, even may therefore cause the damage of storage battery, treats improved design so the structure of the prior art also is a utmost point.
In view of this, the inventor invents out a kind of circuit arrangement that can differentiate polarity and conversion automatically at the fault of construction of prior art invention, and it can overcome the shortcoming that above-mentioned prior art produces.
Summary of the invention
The technical problem that the present invention can differentiate the circuit arrangement desire solution of polarity and conversion automatically is, when two storage batterys connect by the rescue line parallel, if being arranged, the polarity wrong causes situation of short circuit, then the spark that storage battery produced not only produces psychological pressure to the operator, the possibility that more has so blast, for the motorist who is ignorant of how operating, necessity of improvement exploitation is arranged.
For reaching above-mentioned purpose, the invention provides a kind of circuit arrangement that can differentiate polarity and conversion automatically, the technical characterictic of this device is as follows:
A kind of circuit arrangement that can differentiate polarity and conversion automatically, this circuit arrangement is connected between a high potential device and the electronegative potential device, it is characterized in that: this circuit arrangement comprises the first identification testing circuit, the second identification testing circuit, first change-over circuit, second change-over circuit, first relay, second relay, reset switch and incoming junction (S), (T), output connection (U), (V), this incoming junction (S) is connected with this high potential device is anodal, this incoming junction (T) is connected this output connection (U) with this high potential device negative pole, (V) be connected with the positive pole or the negative pole of this electronegative potential device;
In mode of operation (), when the positive pole of electronegative potential device connects output connection (U), negative pole connection output connection (V), this circuit arrangement is selected the first identification testing circuit and the first change-over circuit conducting and orders about first relay suction magnetic conductance to lead to, and makes electric current be sent to the electronegative potential device by the high potential device;
Wherein, the described first identification testing circuit comprises optical coupling controller (IC1), resistance (R1) and diode (D1), and the positive pole of this diode (D1) is connected with electronegative potential device positive pole, output connection (U);
Described first change-over circuit comprises transistor (Q1), and resistance (R2), this first change-over circuit are connected with this first identification testing circuit, this first relay, this reset switch respectively, constitute a charge circuit;
In mode of operation (two), when the negative pole of electronegative potential device connects output connection (U), anodal connection output connection (V), this circuit arrangement is selected the second identification testing circuit and the second change-over circuit conducting and orders about second relay suction magnetic conductance to lead to, and makes electric current be sent to the electronegative potential device by the high potential device;
Wherein, the described second identification testing circuit comprises optical coupling controller (IC2), resistance (R3) and diode (D2), and the negative pole of this diode (D2) is connected with the negative pole of electronegative potential device, output connection (U);
Described second change-over circuit comprises transistor (Q2), and resistance (R4), this second change-over circuit are connected with this second identification testing circuit, this second relay, this reset switch respectively, constitute a charge circuit.
Other purpose of the present invention, advantage and novel characteristics will be more obvious from the following detailed description and related drawings.
Description of drawings
Fig. 1: be circuit block diagram of the present invention;
Fig. 2: be circuit diagram of the present invention;
Fig. 3: be the mode of operation () of Fig. 2;
Fig. 4: be mode of operation of the present invention (two);
Fig. 5: be first preferred embodiment of the present invention;
Fig. 6: be second preferred embodiment of the present invention;
Fig. 7: be the 3rd preferred embodiment of the present invention;
Annex one: be No. 521922 patent case of TW Announcement Number;
Annex two: be the 6th, 130, No. 519 patents of US patent.
Symbol description among the figure:
10 first identification testing circuits, 20 second identification testing circuits
30 first change-over circuits, 40 second change-over circuits
50 conversion start-up circuits, 60 high electric energy storage batterys
70 low electric energy storage battery 80 light fixtures
90 box bodys, 91 power lines
92 power lines, 93 chargers
94 DC power supply
IC1 optical coupling controller IC 2 optical coupling controllers
D1 diode D2 diode
R1 resistance R 2 resistance
R3 resistance R 4 resistance
Q1 transistor Q2 transistor
The Relay1 first relay R elay2 second relay
The L1a1 first contact-making switch L1a2 second contact-making switch
The L2a1 first contact-making switch L2a2 second contact-making switch
S tie point T tie point
U tie point V tie point
The SW reset switch
Embodiment
See also Fig. 1 to Fig. 7, person shown in the figure only for the usefulness of explanation, is not subjected to the restriction of this kind structure in patent application.
Please consult shown in Figure 1 earlier, the present invention can differentiate polarity automatically, and also the circuit arrangement 1 of conversion can be with the electric weight in the high potential device (being a high electric energy storage battery 60 in this preferred embodiment) of input, via the first identification testing circuit 10, the second identification testing circuit 20, first change-over circuit 30, second change-over circuit 40, and conversion the interconnecting of start-up circuit 50, and can be sent to the electronegative potential device (be low electric energy storage battery 70) of output in this preferred embodiments, and therefore finish the action of electric energy supplement.
See also shown in Figure 2ly, be detailed circuit diagram of the present invention, wherein:
This first identification testing circuit 10 has an optical coupling controller IC 1 (IC:IntegratedCircuit integrated circuit), a diode D1 and a resistance R 1, " C " end of this optical coupling controller IC 1 first side is connected to tie point S, and conversion start-up circuit 50, should then be connected to first change-over circuit 30 by " E " end." in+ " of this optical coupling controller IC 1 second side end is connected in series with resistance R 1 and diode D1, and this diode D1 in addition end be connected to tie point U, " in-" end then is connected to the tie point V and second identification circuit 20.
The second identification testing circuit 20 has an optical coupling controller IC 2, a diode D2, a resistance R 3, and " C " end of these optical coupling controller IC 2 first sides is connected to tie point S, and conversion start-up circuit 50, should then be connected to second change-over circuit 40 by " E " end." in-" of these optical coupling controller IC 2 second sides end is connected in series with resistance R 3 and diode D2, and this diode D2 in addition end be connected to tie point U, " in+ " end then is connected to the tie point V and first identification circuit 10.
First change-over circuit 30 has a transistor Q1 and a resistance R 2, this resistance R 2 is connected between first identification circuit 10 and the transistor Q1 base stage, the collector electrode of this transistor Q1 is connected in conversion start-up circuit 50 in addition, in particular, the collector electrode of this transistor Q1 is connected in coil second end of this first relay, coil first end of first relay is connected with the incoming junction S of high potential, the emitter of this transistor Q1 then is connected to a reset switch SW and second change-over circuit 40, and this reset switch SW is connected to tie point T and conversion start-up circuit 50 again.
Second change-over circuit 40 has a transistor Q2 and a resistance R 4, this resistance R 4 is connected between second identification circuit 20 and the transistor Q2 base stage, the collector electrode of this transistor Q2 is connected in conversion start-up circuit 50 in addition, in particular, the collector electrode of this transistor Q2 is connected in coil second end of this second relay, coil first end of second relay is connected with the incoming junction S of high potential, and the emitter of this transistor Q2 then is connected to a reset switch SW and first change-over circuit 30.
This conversion start-up circuit 50 has the first relay R elay1 and the second relay R elay2.Wherein two ends of this first relay R elay1 first contact-making switch L1a1 are connected to tie point U and tie point S respectively, and two ends of the second contact-making switch L1a2 then are connected to tie point V and tie point T respectively.Two ends of the second relay R elay2, the first contact-making switch L2a1 are connected to tie point U and tie point T respectively, and two ends of the second contact-making switch L2a2 then are connected to tie point V and tie point S respectively.
One light fixture, 80, one ends are connected in tie point U, and end is connected in tie point V in addition.
See also shown in Figure 3, be mode of operation of the present invention (one), wherein, this tie point S and tie point T just are being connected to a high electric energy storage battery 60 respectively, negative two ends, and tie point U is connected to a end of low electric energy storage battery 70, tie point V is connected to the b end of low electric energy storage battery 70, if this a end is positive electrode, the b end is negative electrode, then this moment, electric current was by a end flow through diode D1 and resistance R 1 and the optical coupling controller IC 1 that arrives, and " in+ " end and " in-" that order about optical coupling controller IC 1 hold conducting and constitute a loop, " C " end and the conducting simultaneously of " E " end at this moment, and make high electric energy storage battery 60 positive poles, optical coupling controller IC 1, resistance R 2, transistor Q1 and reset switch SW form a loop, so, but this transistor Q1 collector electrode and emitter conducting, and therefore make first relay R elay1 energising lead to magnetic, the first contact-making switch L1a1 and the second contact-making switch L1a2 closure, the positive pole of then high electric energy storage battery 60 links to each other with low electric energy storage battery 70a end (positive pole) via the closure of the first contact-making switch L1a1, negative pole then links to each other with low electric energy storage battery 70b end (negative pole) because of the closure of the second contact-making switch L1a2, thereby form high electric energy storage battery 60 and low electric energy storage battery 70 state in parallel, and the therefore light fixture 80 of conducting parallel connection, to reach the effect of caution.
See also shown in Figure 4, be mode of operation of the present invention (two), wherein, this tie point S and tie point T just are being connected to a high electric energy storage battery 60 respectively, negative two ends, and tie point U is connected to a end of low electric energy storage battery 70, tie point V is connected to the b end of low electric energy storage battery 70, if this b end is positive electrode, the a end is negative electrode, then this moment, electric current was held the optical coupling controller IC 2 of flowing through by b, diode D2 and resistance R 3 and constitute a loop, " C " end and the conducting simultaneously of " E " end at this moment, and make high electric energy storage battery 60 positive poles, optical coupling controller IC 2, resistance R 4, transistor Q2 and reset switch SW form a loop, so, but this transistor Q2 collector electrode and emitter conducting, and therefore make second relay R elay2 energising lead to magnetic, the first contact-making switch L2a1 and the second contact-making switch L2a2 closure, the positive pole of then high electric energy storage battery 60 links to each other with low electric energy storage battery 70b end (positive pole) via the closure of the second contact-making switch L2a2, negative pole then links to each other with low electric energy storage battery 70a end (negative pole) because of the closure of the first contact-making switch L2a1, thereby form high electric energy storage battery 60 and low electric energy storage battery 70 state in parallel, and the therefore light fixture 80 of conducting parallel connection, to reach the effect of caution.
See also shown in Figure 5, be first preferred embodiment of the present invention, wherein, this circuit arrangement 1 that can differentiate polarity and conversion automatically can be arranged in the box body 90, and be parallel with a high electric energy storage battery 60, this box body 90 is provided with two power lines 91,92 by the positive and negative end extension of high electric energy storage battery 60, and this two power line 91,92 is connected to a low electric energy storage battery 70, and because of can differentiating the setting of circuit arrangement 1 of polarity and conversion automatically, the user can not need consider polarity problems and arbitrarily and connect.
See also shown in Figure 6ly, be second preferred embodiment of the present invention, wherein, this high electric energy storage battery 60 is replaceable to be that a charger 93 (for example DC generator) is implemented.
See also shown in Figure 7ly, be the 3rd preferred embodiment of the present invention, wherein, this high electric energy storage battery 60 is replaceable to be that a direct current power supply 94 (for example power supply unit) is implemented.
Can summarize the present invention with regard to the above and have following advantage:
1. the present invention " can differentiate the circuit arrangement of polarity and conversion " automatically, wherein, when this circuit arrangement is connected to a low electric energy storage battery, the circuit of this circuit arrangement inside can be differentiated polarity automatically and change, and by this, the present invention is unlikely the generation spark when the electric energy storage battery is hanged down in connection, fail safe greatly promotes, only pipe is used in the place of light deficiency, or is operated by the user who does not understand polarity, all can arbitrarily and connect and reaches electric energy supplement effect person.
2. the present invention " can differentiate the circuit arrangement of polarity and conversion " automatically, wherein, the present invention only uses two relays, two optical coupling controllers, two transistors, two diodes and four resistance to form, those assemblies all have the cheap advantage of simple structure, so not only can make cost of manufacture reduce to minimum and meet economic principle, and the assembly use is less also can to increase stability, and does not have the situation of misoperation.
3. the present invention " can differentiate the circuit arrangement of polarity and conversion " automatically, wherein, the assembly of this circuit arrangement is selected for use all can be in the state operation down of low-voltage (2.0V) low current (0.02A), so the present invention does not need to connect a force switch to force operation in addition, has the wider advantage of the stable operation and the scope of application all the better.
4. the present invention " can differentiate the circuit arrangement of polarity and conversion " automatically, and wherein, this circuit arrangement is parallel with a light fixture in addition, and the characteristics that this light fixture just moves when having circuit turn-on can be a design easily in order to indicate present mode of operation in fact.
The present invention is described by the drawings in detail of most preferred embodiment.Ripely can derive many variations and needn't deviate from category of the present invention from most preferred embodiment in these those skilled in the art.Therefore, the unlikely restriction of most preferred embodiment category of the present invention.Category of the present invention is defined in claim.
Claims (4)
1. can differentiate the also circuit arrangement of conversion of polarity automatically for one kind, this circuit arrangement is connected between a high potential device and the electronegative potential device, it is characterized in that: this circuit arrangement comprises the first identification testing circuit, the second identification testing circuit, first change-over circuit, second change-over circuit, first relay, second relay, reset switch and first incoming junction (S), second incoming junction (T), first output connection (U), second output connection (V), this first incoming junction (S) is connected with this high potential device is anodal, and this second incoming junction (T) is connected with this high potential device negative pole; This circuit arrangement comprises two kinds of modes of operation:
In first kind of mode of operation, when the positive pole of electronegative potential device connect first output connection (U), when negative pole connects second output connection (V), this circuit arrangement is selected the first identification testing circuit and the first change-over circuit conducting and orders about first relay suction magnetic conductance to lead to, and makes electric current be sent to the electronegative potential device by the high potential device;
Wherein, the described first identification testing circuit comprises the first optical coupling controller (IC1), first resistance (R1) and first diode (D1), and the anode of this first diode (D1) is connected with electronegative potential device positive pole, first output connection (U);
Wherein, the first optical coupling controller (IC1) of the described first identification testing circuit has four outside links separately with the second optical coupling controller (IC2) of the second identification testing circuit, the first outside link (C) of the first optical coupling controller (IC1) is connected to first incoming junction (S) of high potential device, the second outside link (E) of the first optical coupling controller (IC1) then is connected to second resistance (R2) of first change-over circuit, the 3rd outside link (in+) of the first optical coupling controller (IC1) connects the negative electrode of first diode (D1) by first resistance (R1), this first optical coupling controller (IC1) all round portion's link (in-) then be connected with the 3rd outside link (in+) and second output connection (V) of the second optical coupling controller (IC2);
Described first change-over circuit comprises the first transistor (Q1), second resistance (R2), this first change-over circuit respectively with this first identification testing circuit, this first relay, this reset switch connects, constitute a charge circuit, wherein, the base stage of the first transistor of described first change-over circuit (Q1) is connected in the second outside link (E) of the first optical coupling controller (IC1) by second resistance (R2), the collector electrode of this first transistor (Q1) is connected in coil second end of this first relay, and the emitter of the first transistor of this first change-over circuit (Q1) then is connected with the emitter of the transistor seconds (Q2) of this second change-over circuit;
Described first relay has first contact-making switch (L1a1) and second contact-making switch (L1a2), these first contact-making switch (L1a1), two ends are connected with first incoming junction (S) and first output connection (U) respectively, second contact-making switch (L1a2), two ends then are connected with second incoming junction (T) and second output connection (V) respectively, coil first end of first relay is connected with first incoming junction (S) of high potential, when this first relay suction magnetic conductance is logical, make first contact-making switch (L1a1) and second contact-making switch (L1a2) conducting respectively of first relay, thereby constitute the loop;
In second kind of mode of operation, when the negative pole of electronegative potential device connects first output connection (U), anodal connection second output connection (V), this circuit arrangement is selected the second identification testing circuit and the second change-over circuit conducting and orders about second relay suction magnetic conductance to lead to, and makes electric current be sent to the electronegative potential device by the high potential device;
Wherein, the described second identification testing circuit comprises the second optical coupling controller (IC2), the 3rd resistance (R3) and second diode (D2), and the negative pole of this second diode (D2) is connected with the negative pole of electronegative potential device, first output connection (U);
Wherein, the second optical coupling controller (IC2) of the described second identification testing circuit has four outside links, the first outside link (C) of the second optical coupling controller (IC2) is connected to first incoming junction (S) of high potential device, the second outside link (E) of the second optical coupling controller (IC2) then is connected to the 4th resistance (R4) of second change-over circuit, the second optical coupling controller (IC2) all round portion's link (in-) connect the anode of second diode (D2) by the 3rd resistance (R3), the 3rd outside link (in+) of this second optical coupling controller (IC2) and the first optical coupling controller (IC1) the portion's link (in-) and second output connection (V) are connected all round;
Described second change-over circuit comprises transistor seconds (Q2), and the 4th resistance (R4), this second change-over circuit are connected with this second identification testing circuit, this second relay, this reset switch respectively, constitute a charge circuit;
The base stage of the transistor seconds of described second change-over circuit (Q2) is connected in the second outside link (E) of the second optical coupling controller (IC2) by the 4th resistance (R4), the collector electrode of this transistor seconds (Q2) is connected in coil second end of this second relay, and the emitter of the transistor seconds of this second change-over circuit (Q2) then is connected with the emitter of the first transistor (Q1) of this first change-over circuit;
Described second relay has first contact-making switch (L2a1) and second contact-making switch (L2a2), these first contact-making switch (L2a1), two ends are connected with second incoming junction (T) and first output connection (U) respectively, second contact-making switch (L2a2), two ends then are connected with first incoming junction (S) and second output connection (V) respectively, coil first end of second relay is connected with first incoming junction (S) of high potential, when this second relay suction magnetic conductance is logical, make first contact-making switch (L2a1) and second contact-making switch (L2a2) conducting respectively of second relay, thereby constitute the loop;
Wherein, an end of described reset switch (SW) is connected in the emitter of the first transistor (Q1) and transistor seconds (Q2); The other end of described reset switch (SW) then is connected with the negative pole of high potential device.
2. the circuit arrangement that can differentiate polarity and conversion automatically as claimed in claim 1, wherein, an alarming device in parallel between first output connection (U) of this electronegative potential device, second output connection (V).
3. the circuit arrangement that can differentiate polarity and conversion automatically as claimed in claim 1, wherein, this high potential device is a high electric energy storage battery.
4. the circuit arrangement that can differentiate polarity and conversion automatically as claimed in claim 1, wherein, this high potential device is a charger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410036939XA CN100449906C (en) | 2004-04-21 | 2004-04-21 | Circuit arrangement capable of distinguishing polarity automatically and converting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410036939XA CN100449906C (en) | 2004-04-21 | 2004-04-21 | Circuit arrangement capable of distinguishing polarity automatically and converting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1691457A CN1691457A (en) | 2005-11-02 |
| CN100449906C true CN100449906C (en) | 2009-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410036939XA Expired - Fee Related CN100449906C (en) | 2004-04-21 | 2004-04-21 | Circuit arrangement capable of distinguishing polarity automatically and converting |
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| Country | Link |
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| CN (1) | CN100449906C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522909B (en) * | 2011-12-02 | 2014-06-25 | 青海骄阳新能源有限公司 | Non-polar inverter |
| CN105024410A (en) * | 2014-04-16 | 2015-11-04 | 低碳动能开发股份有限公司 | Rescue protection device of cell starting |
| CN114335766B (en) * | 2022-01-04 | 2023-11-14 | 星恒电源股份有限公司 | Low-power consumption battery protection and activation circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5371455A (en) * | 1993-10-08 | 1994-12-06 | Champion Freeze Drying Co., Ltd. | Control circuit for safe charging a rechargeable battery |
| US6262492B1 (en) * | 1999-04-09 | 2001-07-17 | Dhc Specialty Corp. | Car battery jumper cable |
| CN2574274Y (en) * | 2002-08-22 | 2003-09-17 | 刘宪章 | Automatic testing and power polarity switching power connecting conductor device |
-
2004
- 2004-04-21 CN CNB200410036939XA patent/CN100449906C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5371455A (en) * | 1993-10-08 | 1994-12-06 | Champion Freeze Drying Co., Ltd. | Control circuit for safe charging a rechargeable battery |
| US6262492B1 (en) * | 1999-04-09 | 2001-07-17 | Dhc Specialty Corp. | Car battery jumper cable |
| CN2574274Y (en) * | 2002-08-22 | 2003-09-17 | 刘宪章 | Automatic testing and power polarity switching power connecting conductor device |
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|---|---|
| CN1691457A (en) | 2005-11-02 |
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Granted publication date: 20090107 Termination date: 20160421 |