CN202268733U - Novel capacitor step-down constant-current charging circuit - Google Patents
Novel capacitor step-down constant-current charging circuit Download PDFInfo
- Publication number
- CN202268733U CN202268733U CN2011204157511U CN201120415751U CN202268733U CN 202268733 U CN202268733 U CN 202268733U CN 2011204157511 U CN2011204157511 U CN 2011204157511U CN 201120415751 U CN201120415751 U CN 201120415751U CN 202268733 U CN202268733 U CN 202268733U
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- storage battery
- circuit
- voltage
- capacitor step
- constant current
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Abstract
The utility model relates to adopt a novel capacitor step-down constant-current charging circuit. The constant-current charging circuit comprises a leakage protector, a fuse protector, a selectable capacitor step-down circuit, a rectifier bridge, a detection and comparison circuit, a control circuit and a storage battery and is characterized in that after being subjected to capacitor step-down and rectification, the commercial power provides a constant charging current for the storage battery, a voltage detection and comparison control circuit selects the charging current of the storage battery and controls the turn-off of the charging of the storage battery through detecting and comparing the voltage of the storage battery. The constant-current charging circuit provided by the utility model has the advantages that a power supply circuit is simple and reliable, fewer devices are adopted, and the practical value is better.
Description
Technical field
The utility model relates to a kind of novel capacitor step-down constant current charge circuit, can guarantee that the storage battery after the charging has preferable performance, and improve useful life.
Background technology
The existing storage battery charging circuit has the Industrial Frequency Transformer of employing step-down rectifier mode, and the Switching Power Supply of employing and capacitance decompression constant current charge mode are also arranged.This dual mode volume is big, and the device that circuit adopts is many, and reliability is low.Existing battery charging circuit also has the capacitance decompression of employing constant current charge mode, fills the outage at once of full back at storage battery, does not carry out the floating charge process, influences the performance and the useful life of storage battery.
Summary of the invention
In view of above-mentioned technical deficiency, the purpose of the utility model provides a kind of novel capacitor step-down constant current charge circuit.Guarantee that the storage battery after the charging has electric property preferably, and improve the useful life of storage battery.
The utility model adopts following scheme to realize: the utility model relates to a kind of novel capacitor step-down constant current charge circuit, comprises earth leakage protective device, and fuse can be selected capacity voltage dropping circuit, and rectifier bridge detects comparison circuit, control circuit, storage battery.It is characterized in that: described earth leakage protective device is after wherein an inlet wire is connected with outside 220v power supply; Insert the selectivity capacity voltage dropping circuit through overcurrent fuse; One end of selectivity capacity voltage dropping circuit and another inlet wire of power supply are connected to the rectifier bridge input, and the output of rectifier bridge is connected with storage battery through the normally-closed contact of relay.Storage battery two ends and the testing circuit that is made up of resistance, battery tension improve standard+5v power supply after through 7805 voltage stabilizings.At+5v power output end and the bleeder circuit of three resistance series connection is arranged, it draws two end points corresponding storage battery corresponding voltage value respectively, two comparator U1A, and U1B constitutes the core of comparison circuit.The positive input of first comparator connects the test side of storage battery, and negative terminal connects+low pressure point of 5v power supply dividing potential drop end, and output is connected to the base stage of triode through a resistance, and the collector electrode of triode connects the positive pole that a relay coil inserts storage battery again.The positive input of second comparator connects the test side of storage battery; Negative terminal connects+high pressure spot of 5v power supply dividing potential drop end; Output is connected to the base stage of triode through a resistance, and the collector electrode of triode connects a relay coil and is connected in series the positive pole that inserts storage battery behind another relay normally open contact again.The utility model can charge a battery in constant current; Behind charge in batteries to a certain numerical value; Can let little electric capacity work make the little constant current charge of storage battery by the big electric capacity of excision, the diel self discharge loss of considering storage battery be 0.5 ~ 2%, and the selection Capacity Ratio of big electric capacity and little electric capacity is between 15 ~ 22.Under the situation of little electric capacity constant current charge, the terminal voltage of storage battery also rises to certain magnitude of voltage (like 120%Ue), the then actuating of relay, excision charge circuit.
The utility model power supply circuits are simple and reliable, and the device of employing is few, has good practical values.
Description of drawings
Fig. 1 is the utility model circuit theory sketch map.
Fig. 2 is the utility model circuit embodiments circuit diagram.
Embodiment
As shown in Figure 1, relate to employing with novel. a kind of novel capacitor step-down constant current charge circuit comprises earth leakage protective device; Fuse can be selected capacity voltage dropping circuit, rectifier bridge; Detect comparison circuit, control circuit, storage battery; It is characterized in that: civil power is through capacitance decompression, and for storage battery provides constant charging current, described voltage detecting comparison control circuit is selected the charging current of storage battery and the shutoff of control charge in batteries through the voltage that relatively detects storage battery after the rectification.
Fig. 2 is the specific embodiment circuit diagram, and wherein the output of storage battery is through resistance R 1, and R2 after the R3 dividing potential drop, is the positive input magnitude of voltage of comparator U1A and U1B in the conduct of sampled point A point.The sampled point A voltage of ordering is also as the input voltage of Voltage stabilizing module 7805 in addition, and the voltage of 7805 outputting standards+5v is through resistance R 4, R5, and after the R6 dividing potential drop, at sampled point B, C is as the negative input magnitude of voltage of comparator U1A and U1B.The B point is the high pressure sampled point just, and the C point is the low pressure sampled point just.A like this, the voltage that B, C are ordered is respectively:
When charge in batteries to a certain numerical value, should excise big electric capacity and let little electric capacity work make the little constant current charge of storage battery, the voltage that the voltage that sampling in this time A is ordered is ordered greater than low pressure sampled point C, the voltage of ordering less than high pressure sampled point B.Comparator U1A exports high level like this, the U1B output low level, and triode Q1 conducting, Q2 ends.Relay coil K1 gets electric, and the normally closed interlock of relay K 1 breaks off, and normally open contact is closed, and so big capacitor C 1 is just cut away, and little capacitor C 2 charges a battery with regard to the mode of devoting oneself to work with little constant current.
Under the situation of little electric capacity constant current charge; The terminal voltage of storage battery also rises to certain magnitude of voltage (like 120%Ue), the voltage that the voltage that this time sampling A is ordered is ordered greater than low pressure sampled point C, the voltage of ordering greater than high pressure sampled point B; Comparator U1A exports high level; U1B exports high level, triode Q1 conducting, Q2 conducting.This time, relay coil K1 got electricly, and the normally closed interlock of relay K 1 breaks off, and normally open contact is closed, and relay coil K2 gets electric, and normally closed interlock breaks off, and has so just cut away charge circuit.
When the voltage of storage battery dropped to certain value, the sampling A voltage of ordering was less than the voltage of ordering in low pressure sampled point C, the voltage of ordering less than high pressure sampled point B.This time comparator U1A output low level, the U1B output low level, triode Q1 ends, Q2 ends.Relay coil K1, K2 must not get electric, and normally closed interlock is all closed, and this time, the mode with big constant current began to charge a battery.
The diel self discharge loss of considering storage battery is 0.5 ~ 2%.The selection Capacity Ratio of big electric capacity and little electric capacity is between 15 ~ 22.If the capacity of storage battery is 100AH, then the charging current of constant current is 10A, then:
In like manner, the value of the value of little electric current and little electric capacity is:
The above is merely the preferred embodiment of the utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to the covering scope of the utility model.
Claims (4)
1. a novel capacitor step-down constant current charge circuit comprises earth leakage protective device, fuse; Can select capacity voltage dropping circuit, rectifier bridge detects comparison circuit; Control circuit, storage battery is characterized in that: civil power is through capacitance decompression; For storage battery provides constant charging current, described voltage detecting comparison control circuit is selected the charging current of storage battery and the shutoff of control charge in batteries through the voltage that relatively detects storage battery after the rectification.
2. a kind of novel capacitor step-down constant current charge circuit according to claim 1 is characterized in that being in parallel with little electric capacity after the selectivity capacity voltage dropping circuit is by big capacitances in series relay normally closed interlock.
3. a kind of novel capacitor step-down constant current charge circuit according to claim 1 is characterized in that civil power normally closed interlock through relay after capacitance decompression rectification output links to each other with storage battery.
4. a kind of novel capacitor step-down constant current charge circuit according to claim 1, the selection Capacity Ratio that it is characterized in that big electric capacity and little electric capacity is between 15 ~ 22.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204157511U CN202268733U (en) | 2011-10-27 | 2011-10-27 | Novel capacitor step-down constant-current charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204157511U CN202268733U (en) | 2011-10-27 | 2011-10-27 | Novel capacitor step-down constant-current charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202268733U true CN202268733U (en) | 2012-06-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204157511U Expired - Fee Related CN202268733U (en) | 2011-10-27 | 2011-10-27 | Novel capacitor step-down constant-current charging circuit |
Country Status (1)
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| CN (1) | CN202268733U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104184130A (en) * | 2013-05-27 | 2014-12-03 | 深圳市海洋王照明工程有限公司 | Battery short-circuit protection circuit |
-
2011
- 2011-10-27 CN CN2011204157511U patent/CN202268733U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104184130A (en) * | 2013-05-27 | 2014-12-03 | 深圳市海洋王照明工程有限公司 | Battery short-circuit protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20120606 Termination date: 20141027 |
|
| EXPY | Termination of patent right or utility model |