CN103715748A - Lithium battery charging circuit - Google Patents

Lithium battery charging circuit Download PDF

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Publication number
CN103715748A
CN103715748A CN201210375343.7A CN201210375343A CN103715748A CN 103715748 A CN103715748 A CN 103715748A CN 201210375343 A CN201210375343 A CN 201210375343A CN 103715748 A CN103715748 A CN 103715748A
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module
output
charge control
input
lithium battery
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CN103715748B (en
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周明杰
任义
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Abstract

A lithium battery charging circuit comprises a power supply module, a charging control module, a power transformation module, a rectifier and filter module, a feedback module, a current detection module and a sampling comparison module. When the output voltage, sampled by the lithium battery charging circuit, of a second secondary module is higher than the rated value or the output voltage of the power supply module increases, the sampling comparison module controls the current of the input end of the charging control module to decrease and the charging control module controls the output voltage of the power transformation module to decrease. When the current of the input end of the charging control module is higher than the rated value, the current of the output end of the sampling comparison module decreases, the sampling comparison module controls the charging control module to be switched off, the power transformation module does not output voltage, and the lithium battery charging circuit stops charging a lithium battery. Therefore, the lithium battery charging circuit can protect a lithium battery in over-current, overload, open-circuit and short-circuit situations so as to prevent a circuit from malfunctioning to cause damage to the lithium battery and prolong the service life of the lithium battery.

Description

Lithium battery charging circuit
Technical field
The present invention relates to charging circuit, particularly relate to the lithium battery charging circuit of a kind of overcurrent, overload, open circuit and short-circuit protection.
Background technology
Portable set has penetrated into the various aspects of routine work life, mobile phone, panel computer, digital camera, various portable equipments etc. at present.And these portable sets generally adopt environmental protection, high power capacity, small size, memory-less effect, the life-span is long, high temperature performance is good lithium battery power supply.Because most of lithium battery charger is cheap because of it, circuit design is relatively simple, thereby occurs when abnormal, can causing damage to the lithium battery charging at circuit.Therefore, not only optimum charging effect cannot be reached, but also the useful life of lithium battery can be shortened.
Summary of the invention
Based on this, provide a kind of lithium battery charging circuit that circuit abnormality is protected.
A lithium battery charging circuit, comprises power module, charge control module, power transformation module, rectification filtering module and feedback module, also comprises current detection module and sampling comparison module;
Described power module is used for exporting DC power supply to described charge control module, described power transformation module, described feedback module, described current detection module and the power supply of described sampling comparison module;
Described charge control module comprises control end, output and input; Described power transformation module comprises first input end, the second input, the first secondary module and second subprime module, and described the first secondary module comprises the first output and the second output, and described second subprime module comprises the first output and the second output; Described feedback module comprises input and output; Described current detection module comprises input and output; Described sampling comparison module comprises sampling end, control end, output and ground;
The output of described power module is connected with the first input end of described power transformation module, the control end of described charge control module is connected with the common port of the first input end of described power transformation module with the output of described power module, the input of described charging control end module is connected with the second input of described power transformation module, and the output of described charge control module is connected with the control end of described sampling comparison module;
Described rectification filtering module comprises the first rectification filtering module and the second rectification filtering module; After described the first secondary module is connected with described the first rectification filtering module for giving described lithium cell charging;
Described the second rectification filtering module comprises first input end, the second input and earth terminal, the first input end of described the second rectification module is connected with the first output of described second subprime module, the second input of described the second rectification filtering module is connected with the second output of described second subprime module, and the sampling end of described sampling comparison module is connected with the common port of the second output of described second subprime module and the second input of described the second rectification filtering module; The earth terminal ground connection of described the second rectification filtering module;
The input of described feedback module is connected with the common port of the first input end of described the second rectification filtering module with the first output of described second subprime module, the output of described feedback module is connected with the output of described sampling comparison module, and the output of described sampling comparison module is connected with the common port of the output of described feedback module and the control end of described charge control module;
The input of described current detection module is connected with the common port of the control end of described sampling comparison module with the output of described charge control module, the output head grounding of described current detection module;
Described feedback module, for the output voltage of described second subprime module is fed back to described charge control module, makes described charge control module be operated in higher-order of oscillation state;
Described sampling comparison module is at the output voltage that samples second subprime module during higher than rated value, the input electric current that described sampling comparison module is controlled described charge control module reduces, and described charge control module controls the first secondary module of described power transformation module and the output voltage of second subprime module is reduced to below rated value;
The input electric current of described charge control module is during higher than rated value, the electric current that described current detection module is controlled described sampling comparison module output reduces, and then the control end electric current of described charge control module reduces, described charge control module disconnects, and described lithium battery charging circuit stops described lithium cell charging.
Therein in an embodiment, described power module comprises electromagnetic interference module, filtration module, the rectification module of series connection successively, the output of power module described in the output termination of described rectification module, the direct voltage of described power module for exporting.
Therein in an embodiment, described charge control module comprises triode Q1, the base stage of described triode Q1 is the control end of described charge control module, the input of the very described charge control module of the current collection of described triode Q1, the emitter of described triode Q1 connects the output of described charge control module.
Therein in an embodiment, described current detection module comprises current sense resistor R3, the input that one end that described current sense resistor R3 is connected with the output of described charge control module is described current detection module, the output of current detection module described in another termination.
In an embodiment, described feedback module comprises resistance R 6 and capacitor C 4 therein, and described resistance R 6 and capacitor C 4 are series between first output and the control end of described charge control module of described second subprime module.
Therein in an embodiment, described sampling comparison module comprises voltage stabilizing didoe ZD1 and triode Q2, the positive pole of described voltage stabilizing didoe ZD1 is connected with the base stage of described triode Q2, the negative pole of described voltage stabilizing didoe ZD1 is the sampling end of described sampling comparison module, the earth terminal of the very described sampling comparison module of the transmitting of described triode Q2, the output of the very described sampling comparison module of the current collection of described triode Q2, the common port of described voltage stabilizing didoe ZD1 and triode Q2 is the control end of described sampling comparison module.
Therein in an embodiment, described the first rectification filtering module comprises electrochemical capacitor C5 and diode D3, described electrochemical capacitor C5 and diode D3 series connection, the positive pole of described electrochemical capacitor C5 is connected with the first output of described the first secondary module, and the negative pole of described diode D3 is connected with the second output of described the first secondary module;
Described the second rectification filtering module comprises electrochemical capacitor C3 and diode D4, described electrochemical capacitor C3 and diode D4 series connection, the positive pole of described electrochemical capacitor C3 is connected with the second output of described second subprime module, the negative pole of described diode D4 is connected with the first output of described second subprime module, the common end grounding of described electrochemical capacitor C3 and diode D4.
Therein in an embodiment; also comprise high voltage protective module; described high voltage protective module comprises capacitor C 2, resistance R 2 and diode D1; after described resistance R 2 and diode D1 series connection, be parallel between the first input end and the second input of described power transformation module, described capacitor C 2 is in parallel with described resistance R 2.
In an embodiment, also comprise that charging indicating module comprises resistance R 5 and light-emitting diode D2 therein, after described resistance R 5 and light-emitting diode D2 series connection, be parallel between the output of described the first rectification filtering module.
In an embodiment, also comprise divider resistance R1 and divider resistance R4 therein, between described divider resistance R1 series connection and the output of described power module and the control end of described charge control module;
Described divider resistance R4 is series between the input of described current detection module and the control end of described sampling comparison module.
The sampling comparison module for the second subprime module output voltage of sampling in above-mentioned lithium battery charging circuit, collecting second subprime module output voltage, higher than rated value, be that lithium battery charging circuit is during in open-circuit condition, or the output voltage of power module is when uprise, the input electric current that the comparison module of now sampling is controlled charge control module reduces, and then the output voltage of charge control module control power transformation module reduces.At the input electric current of charge control module during higher than rated value, be that lithium battery charging circuit is when overcurrent, overload and short-circuit condition, the output end current of sampling comparison module reduces, and then control charge control module disconnects, thereby be subject to not output voltage of power transformation module that charge control module controls, lithium battery charging circuit stops described lithium cell charging.Therefore, above-mentioned lithium battery charging circuit can be protected lithium battery when the abnormal conditions such as overcurrent, overload, open circuit and short circuit, thereby avoids circuit to occur extremely lithium battery being caused damage, so can improve the useful life of lithium battery.
Accompanying drawing explanation
Fig. 1 is the module map of lithium battery charging circuit;
Fig. 2 is the schematic diagram of lithium battery charging circuit.
Embodiment
As shown in Figure 1, be the module map of lithium battery charging circuit.
A lithium battery charging circuit, comprises power module 101, charge control module 103, power transformation module 105, rectification filtering module 107 and feedback module 109, also comprises current detection module 111 and sampling comparison module 113.
Power module 101 is for exporting DC power supply to charge control module 103, power transformation module 105, rectification filtering module 107, feedback module 109, current detection module 111 and 113 power supplies of sampling comparison module.
Charge control module 103 comprises control end, output and input; Power transformation module 105 comprises first input end, the second input, the first secondary module and second subprime module, and the first secondary module comprises the first output and the second output, and second subprime module comprises the first output and the second output; Feedback module 109 comprises input and output; Current detection module 113 comprises input and output; Sampling comparison module 111 comprises sampling end, control end, output and ground.
The output of power module 101 is connected with the first input end of power transformation module 105, the control end of charge control module 103 is connected with the common port of the first input end of power transformation module 105 with the output of power module 101, the input of charging control end module 103 is connected with the second input of power transformation module 105, and the output of charge control module 103 is connected with the control end of sampling comparison module 111.
Rectification filtering module 107 comprises the first rectification filtering module 1071 and the second rectification filtering module 1072; After the first secondary module is connected with the first rectification filtering module 1071 for giving lithium cell charging.
The second rectification filtering module 1072 comprises first input end, the second input and earth terminal, the first input end of the second rectification module 1072 is connected with the first output of second subprime module, the second input of the second rectification filtering module 1072 is connected with the second output of second subprime module, and the sampling sampling end of comparison module 111 and the second output of second subprime module are connected with the common port of the second input of the second rectification filtering module 1072; The earth terminal ground connection of the second rectification filtering module 1072.
The input of feedback module 109 is connected with the common port of the first input end of the second rectification filtering module 1072 with the first output of second subprime module, the output of feedback module 109 is connected with the output of sampling comparison module 111, and the sampling output of comparison module 111 and the common port of the output of feedback module 109 are connected with the control end of charge control module 103.
The input of current detection module 113 is connected with the common port of the control end of sampling comparison module 111 with the output of charge control module 103, the output head grounding of current detection module 113.
Feedback module 109, for the output voltage of second subprime module is fed back to charge control module 103, makes charge control module 103 be operated in higher-order of oscillation state.
Sampling comparison module 111 is at the output voltage that samples second subprime module during higher than rated value, the input electric current that sampling comparison module 111 is controlled charge control module 103 reduces, and charge control module 103 controls the first secondary module of power transformation module 105 and the output voltage of second subprime module is reduced to below rated value.
The input electric current of charge control module 103 is during higher than rated value, the electric current that current detection module 113 is controlled sampling comparison module 111 outputs reduces, and then the control end electric current of charge control module 103 reduces, charge control module 103 disconnects, and lithium battery charging circuit stops lithium cell charging.
Charge control module 103 is for controlling the output voltage of power transformation module 105.When lithium battery charging circuit is normally worked, charge control module 103 is controlled the pressure drop of power transformation module 105 stable outputs, makes the charging voltage of charger constant.At lithium battery charging circuit during in overcurrent, overload or short circuit, charge control module 103 is controlled self according to the output current of sampling comparison module 111 and is disconnected, thereby make power transformation module 105 open circuits, lithium battery charging circuit is not exported charging voltage, stops lithium cell charging.
Power transformation module 105 is for converting high tension voltage to two equal-sized voltages, respectively as charging voltage and the feedback voltage of lithium battery.
Rectification filtering module 107 is for carrying out rectification and filtering to the output voltage of power transformation module 105.
Feedback module 109 is for feeding back to charge control module 103 by the output voltage of second subprime module, preferably, the output voltage of second subprime module equates with the output voltage of the first secondary module, therefore, feedback module 109 feeds back to charge control module 103 by the output voltage of second subprime module.Charge control module 103, according to the output voltage of the voltage control power transformation module 105 of feedback, makes the output voltage of voltage changing module 105 near rated value.
Sampling comparison module 111 is for the output voltage of the second subprime module of sampling, at the output voltage of sampling during higher than rated voltage, sampling comparison module 111 is changed by the voltage of sampling and the output that is connected by the control end with charge control module 103 is exported to charge control module 103, the electric current of charge control module 103 control ends reduces, therefore, the input electric current of charge control module 103 reduces, the load capacity that is charge control module 103 diminishes, the output voltage of correspondingly, power transformation module 105 reduces.Thereby reach by sampling comparison module 111 sampling and outputting voltages, feed back to charge control module 103, the output voltage of controlling power transformation module 105 by charge control module 103 reduces.
When accordingly, the output voltage of sampling comparison module 111 samplings is lower than rated voltage.111 cut-offs of sampling comparison module, sampling comparison module 111 is not to charge control module 103 effects, and therefore, the load capacity of charge control module 103 strengthens, and output voltage can raise again.Therefore, sampling comparison module 111 can make lithium battery charging circuit in voltage stabilizing state.
Current detection module 113 produces higher pressure drop for the output in charge control module 103.When overcurrent, overload or short circuit appear in lithium battery charging circuit, at the higher electric current of input generation of charge control module 103, and therefore the current detection module 113 being connected with the output of charge control module 103 can produce higher pressure drop.The higher pressure drop that current detection module 113 produces makes to sample comparison module 111 in saturation conduction state, therefore, the control end of charge control module 103 can end while receiving the signal of sampling comparison module 111 in state, thereby lithium battery charging circuit stops charging.
Incorporated by reference to Fig. 2.
Power module 101 comprises electromagnetic interference module, filtration module, the rectification module of series connection successively, the output of the output termination power module 101 of rectification module, and power module 101 is for exporting the direct voltage of 300V.Particularly, electromagnetic interference module comprises fuse FUSE1, electrochemical capacitor CX1 and isolating transformer, and filtration module comprises electrochemical capacitor CX2, capacitor C 1, capacitor C Y1 and capacitor C Y2, and rectification module is rectifier bridge BD1.Power module 101 is for being converted to 300V at direct voltage by the 220V civil power of three-phase.
Charge control module 103 comprises triode Q1, and the base stage of triode Q1 is the control end of charge control module 103, and the current collection of triode Q1 is the input of charge control module 103 very, and the emitter of triode Q1 connects the output of charge control module 103.
Power transformation module 105 is power transformation device T1, two inputs of the primary coil of power transformation device T1 are respectively first input end and second input of power transformation module 105, power transformation device T1 comprises two secondary coils, is respectively the first secondary module and the second subprime module of power transformation module 105.Secondary coil comprises two outputs.
The first rectification filtering module 1071 comprises electrochemical capacitor C5 and diode D3, electrochemical capacitor C5 and diode D3 series connection, the positive pole of electrochemical capacitor C5 is connected with the first output of the first secondary module, and the negative pole of diode D3 is connected with the second output of the first secondary module;
The second rectification filtering module 1072 comprises electrochemical capacitor C3 and diode D4, electrochemical capacitor C3 and diode D4 series connection, the positive pole of electrochemical capacitor C3 is connected with the second output of second subprime module, the negative pole of diode D4 is connected with the first output of second subprime module, the common end grounding of electrochemical capacitor C3 and diode D4.
Feedback module 109 comprises resistance R 6 and capacitor C 4, and resistance R 6 and capacitor C 4 are series between the first output of second subprime module and the control end of charge control module 103.
Sampling comparison module 111 comprises voltage stabilizing didoe ZD1 and triode Q2, the positive pole of voltage stabilizing didoe ZD1 is connected with the base stage of triode Q2, the negative pole of voltage stabilizing didoe ZD1 is the sampling end of sampling comparison module 111, very the sample earth terminal of comparison module 11 of the transmitting of triode Q2, very the sample output of comparison module 111 of the current collection of triode Q2, the common port of voltage stabilizing didoe ZD1 and triode Q2 is the control end of sampling comparison module 111.
Current detection module 113 comprises current sense resistor R3, and one end that current sense resistor R3 is connected with the output of charge control module 103 is the input of current detection module 113, the output of another termination current detection module 113.
Lithium battery charging circuit also comprises high voltage protective module 115; high voltage protective module 115 comprises capacitor C 2, resistance R 2 and diode D1; after resistance R 2 and diode D1 series connection, be parallel between the first input end and the second input of power transformation module 105, capacitor C 2 is in parallel with resistance R 2.
When triode Q1 ends, the collector electrode of triode Q1 can produce very high induced voltage, and particularly, induced voltage can be up to more than 1000V, and such induction high pressure can make triode Q1 punch through damage.Therefore; between the collector electrode of triode and the output of power module 101, connect after high voltage protective module 115; induction high pressure charges to capacitor C 2 by diode D1; and can by resistance R 2, discharge immediately after capacitor C 2 chargings; thereby absorb induction high pressure, reach the object of protection triode Q1.
Lithium battery charging circuit also comprises charging indicating module 117, and charging indication 117 comprises resistance R 5 and light-emitting diode D2, after resistance R 5 and light-emitting diode D2 series connection, is parallel between the output of the first rectification filtering module 1071.When lithium battery charging circuit is normally worked, light-emitting diode D1 lights.
Lithium battery charging circuit also comprises divider resistance R1 and divider resistance R4, between divider resistance R1 series connection and the output of power module 101 and the control end of charge control module 103.
Divider resistance R4 is series between the input of current detection module 113 and the control end of sampling comparison module 111.
Based on above-mentioned all embodiment, the operation principle of lithium battery charging circuit is as follows: after the conversion of the civil power of 220V via power module 101, by the direct voltage of power module 101 output 300V.Be the direct voltage of the elementary input 300V of power transformation module 105, and by exporting to lithium battery after the first primary module output, the first rectification filtering module rectifying and wave-filtering.By the second primary module output, feedback module 109, feed back to charge control module 103, charge control module 103 is controlled the output voltage size of power transformation module 105 according to feedback voltage.
The output voltage that sampling comparison module 111 samples the second output module is during higher than rated voltage, and the charging voltage of lithium battery is higher than normal charging voltage.Voltage stabilizing didoe ZD1 reverse-conducting in sampling comparison module 111, for triode Q2 provides enough saturation conduction voltage, triode Q2 saturation conduction, the collector electrode output current of triode Q2 reduces, thereby the base current of triode Q1 also reduces, and the collector current of corresponding triode Q1 reduces, the load capacity of triode Q1 reduces, the elementary input voltage of power transformation module 105 reduces, therefore, and corresponding the reducing of output voltage of the first secondary module and second subprime module.
The output voltage that samples the second output when sampling comparison module 111 is during lower than rated voltage, and the charging voltage of lithium battery is less than normal charging voltage.The voltage stabilizing didoe ZD1 of sampling in comparison module 111 cannot conducting, therefore, triode Q2 cut-off, the base voltage of triode Q1 is inputted by power module 101, thereby the collector current of triode Q1 increases, the load capacity of triode Q1 strengthens, the elementary input voltage of power transformation module 105 increases, and the output voltage of the first secondary module and second subprime module increases.
At lithium battery charging circuit during in overcurrent, overload or short circuit, the collector current of triode Q1 sharply increases, therefore, the emitter output current of triode Q1 increases, two ends at current sense resistor R3 produce higher pressure drop, make triode Q2 saturation conduction, thereby the base current of triode Q1 reduces.Because the voltage at current sense resistor R3 two ends is constant at this moment, so triode Q2 continues in saturation conduction state, the base current of triode Q1 can be reduced to and can directly ignore, and triode Q1 can think cut-off.Lithium battery charging circuit disconnects, no longer to lithium cell charging.
The sampling comparison module 111 for the second subprime module output voltage of sampling in above-mentioned lithium battery charging circuit, collecting second subprime module output voltage, higher than rated value, be that lithium battery charging circuit is in open-circuit condition, or the output voltage of power module uprises, the input electric current that the comparison module 111 of now sampling is controlled charge control module 103 reduces, and then the output voltage that charge control module 103 is controlled power transformation module 105 reduces.At the input electric current of charge control module 103 during higher than rated value, be that lithium battery charging circuit is in overcurrent, overload and short-circuit condition, the output end current of sampling comparison module 111 reduces, and then control charge control module 103 disconnects, thereby be subject to not output voltage of power transformation module 105 that charge control module 103 controls, lithium battery charging circuit stops lithium cell charging.Therefore, above-mentioned lithium battery charging circuit can be protected lithium battery when overcurrent, overload, open circuit and short circuit, thereby avoids circuit to occur extremely lithium battery being caused damage, so can improve the useful life of lithium battery.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.

Claims (10)

1. a lithium battery charging circuit, comprises power module, charge control module, power transformation module, rectification filtering module and feedback module, it is characterized in that, also comprises current detection module and sampling comparison module;
Described power module is used for exporting DC power supply to described charge control module, described power transformation module, described feedback module, described current detection module and the power supply of described sampling comparison module;
Described charge control module comprises control end, output and input; Described power transformation module comprises first input end, the second input, the first secondary module and second subprime module, and described the first secondary module comprises the first output and the second output, and described second subprime module comprises the first output and the second output; Described feedback module comprises input and output; Described current detection module comprises input and output; Described sampling comparison module comprises sampling end, control end, output and ground;
The output of described power module is connected with the first input end of described power transformation module, the control end of described charge control module is connected with the common port of the first input end of described power transformation module with the output of described power module, the input of described charging control end module is connected with the second input of described power transformation module, and the output of described charge control module is connected with the control end of described sampling comparison module;
Described rectification filtering module comprises the first rectification filtering module and the second rectification filtering module; After described the first secondary module is connected with described the first rectification filtering module for giving described lithium cell charging;
Described the second rectification filtering module comprises first input end, the second input and earth terminal, the first input end of described the second rectification module is connected with the first output of described second subprime module, the second input of described the second rectification filtering module is connected with the second output of described second subprime module, and the sampling end of described sampling comparison module is connected with the common port of the second output of described second subprime module and the second input of described the second rectification filtering module; The earth terminal ground connection of described the second rectification filtering module;
The input of described feedback module is connected with the common port of the first input end of described the second rectification filtering module with the first output of described second subprime module, the output of described feedback module is connected with the output of described sampling comparison module, and the output of described sampling comparison module is connected with the common port of the output of described feedback module and the control end of described charge control module;
The input of described current detection module is connected with the common port of the control end of described sampling comparison module with the output of described charge control module, the output head grounding of described current detection module;
Described feedback module, for the output voltage of described second subprime module is fed back to described charge control module, makes described charge control module be operated in higher-order of oscillation state;
Described sampling comparison module is at the output voltage that samples second subprime module during higher than rated value, the input electric current that described sampling comparison module is controlled described charge control module reduces, and described charge control module controls the first secondary module of described power transformation module and the output voltage of second subprime module is reduced to below rated value;
The input electric current of described charge control module is during higher than rated value, the electric current that described current detection module is controlled described sampling comparison module output reduces, and then the control end electric current of described charge control module reduces, described charge control module disconnects, and described lithium battery charging circuit stops described lithium cell charging.
2. lithium battery charging circuit according to claim 1, it is characterized in that, described power module comprises successively electromagnetic interference module, filtration module, the rectification module of series connection, the output of power module described in the output termination of described rectification module, and described power module is for output dc voltage.
3. lithium battery charging circuit according to claim 1, it is characterized in that, described charge control module comprises triode Q1, the base stage of described triode Q1 is the control end of described charge control module, the input of the very described charge control module of the current collection of described triode Q1, the emitter of described triode Q1 connects the output of described charge control module.
4. lithium battery charging circuit according to claim 1, it is characterized in that, described current detection module comprises current sense resistor R3, the input that one end that described current sense resistor R3 is connected with the output of described charge control module is described current detection module, the output of current detection module described in another termination.
5. lithium battery charging circuit according to claim 1, it is characterized in that, described feedback module comprises resistance R 6 and capacitor C 4, and described resistance R 6 and capacitor C 4 are series between first output and the control end of described charge control module of described second subprime module.
6. lithium battery charging circuit according to claim 1, it is characterized in that, described sampling comparison module comprises voltage stabilizing didoe ZD1 and triode Q2, the positive pole of described voltage stabilizing didoe ZD1 is connected with the base stage of described triode Q2, the negative pole of described voltage stabilizing didoe ZD1 is the sampling end of described sampling comparison module, the earth terminal of the very described sampling comparison module of the transmitting of described triode Q2, the output of the very described sampling comparison module of the current collection of described triode Q2, the common port of described voltage stabilizing didoe ZD1 and triode Q2 is the control end of described sampling comparison module.
7. lithium battery charging circuit according to claim 1, it is characterized in that, described the first rectification filtering module comprises electrochemical capacitor C5 and diode D3, described electrochemical capacitor C5 and diode D3 series connection, the positive pole of described electrochemical capacitor C5 is connected with the first output of described the first secondary module, and the negative pole of described diode D3 is connected with the second output of described the first secondary module;
Described the second rectification filtering module comprises electrochemical capacitor C3 and diode D4, described electrochemical capacitor C3 and diode D4 series connection, the positive pole of described electrochemical capacitor C3 is connected with the second output of described second subprime module, the negative pole of described diode D4 is connected with the first output of described second subprime module, the common end grounding of described electrochemical capacitor C3 and diode D4.
8. lithium battery charging circuit according to claim 1; it is characterized in that; also comprise high voltage protective module; described high voltage protective module comprises capacitor C 2, resistance R 2 and diode D1; after described resistance R 2 and diode D1 series connection, be parallel between the first input end and the second input of described power transformation module, described capacitor C 2 is in parallel with described resistance R 2.
9. lithium battery charging circuit according to claim 1, it is characterized in that, also comprise that charging indicating module comprises resistance R 5 and light-emitting diode D2, after described resistance R 5 and light-emitting diode D2 series connection, be parallel between the output of described the first rectification filtering module.
10. lithium battery charging circuit according to claim 1, is characterized in that, also comprises divider resistance R1 and divider resistance R4, between described divider resistance R1 series connection and the output of described power module and the control end of described charge control module;
Described divider resistance R4 is series between the input of described current detection module and the control end of described sampling comparison module.
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CN106162483A (en) * 2015-03-12 2016-11-23 中国人民解放军装甲兵工程学院 A kind of tank radio set audio accessory detection device
CN111193310A (en) * 2018-10-26 2020-05-22 李尔公司 Series DC/DC converter for vehicle battery charger
CN113890161A (en) * 2021-09-29 2022-01-04 深圳市明鑫电源技术有限公司 Charging circuit and charger

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CN106162483A (en) * 2015-03-12 2016-11-23 中国人民解放军装甲兵工程学院 A kind of tank radio set audio accessory detection device
CN105846490A (en) * 2016-03-20 2016-08-10 来安县新元机电设备设计有限公司 Mobile terminal charging protection circuit and mobile terminal
CN111193310A (en) * 2018-10-26 2020-05-22 李尔公司 Series DC/DC converter for vehicle battery charger
CN111193310B (en) * 2018-10-26 2023-08-11 李尔公司 Series DC/DC converter for vehicle battery charger
CN113890161A (en) * 2021-09-29 2022-01-04 深圳市明鑫电源技术有限公司 Charging circuit and charger

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