CN103151824A - Lithium battery charging control circuit - Google Patents
Lithium battery charging control circuit Download PDFInfo
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- CN103151824A CN103151824A CN2013101082409A CN201310108240A CN103151824A CN 103151824 A CN103151824 A CN 103151824A CN 2013101082409 A CN2013101082409 A CN 2013101082409A CN 201310108240 A CN201310108240 A CN 201310108240A CN 103151824 A CN103151824 A CN 103151824A
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Abstract
The invention provides a lithium battery charging control circuit, and particularly relates to the lithium battery charging control circuit. The lithium battery charging control circuit aims at solving the problems that in the charging process of a lithium battery, the service life of the lithium battery is influenced due to the overcharging, or even the danger can be caused. A signal processing circuit receives voltage signals and end voltage signals in the lithium battery to output first voltage signals, a triangular wave generating circuit generates triangular waves at a certain frequency, a PWM (pulse width modulation) circuit has reference voltage signals, the first voltage signals and the reference voltage signals are compared to generate second voltage signals, the second voltage signals and the triangular waves generated by the triangular wave generating circuit are compared to generate PWM signals, and a driving circuit amplifies the PWM signals of the PWM circuit, and generates first switch signals and second switch signals. The lithium battery charging control circuit has the advantages that the charging control circuit is simple and reliable, and a lithium battery pack can be enabled not to be overcharged, so the service life of the battery pack is ensured. The lithium battery charging control circuit is applicable to the field of control.
Description
Technical field
The present invention relates to a kind of charging control circuit, be specifically related to the lithium cell charging control circuit.
Background technology
Lithium battery is high due to energy density, serviceability temperature wide ranges, self-discharge rate are low, memory-less effect, discharge and recharge the characteristics such as the life-span is long and pollution-free, becomes space of new generation accumulation power supply, and lithium battery more and more is applied in the space aircraft.But the charging control technology of lithium battery is different from other energy-storage batteries, in use, architectural characteristic according to the active material of lithium battery, definitely can not overcharge, otherwise the structure of positive electrode can be subsided when voltage surpasses certain value, even produce danger the useful life that affects battery.
Summary of the invention
The present invention even produces dangerous problem the useful life that affects lithium battery because overcharging, thereby has proposed the lithium cell charging control circuit in order to solve lithium battery in charging process.
The lithium cell charging control circuit comprises that lithium battery, current sampling circuit, signal processing circuit, source of stable pressure, drive circuit, pulse-width modulation circuit, triangular signal produce circuit and switching tube circuit,
Signal processing circuit gathers the terminal voltage signal of lithium battery;
Current sampling circuit be used for to gather the charging current signal of the charge circuit of lithium battery, and this charging current signal is converted into voltage signal is sent to signal processing circuit,
Described source of stable pressure is sent to signal processing circuit, drive circuit and switching tube circuit simultaneously with voltage regulation signal,
Signal processing circuit compares terminal voltage signal, voltage signal and the voltage regulation signal of the lithium battery that receives, and get maximum signal as the first voltage signal, and will be sent to pulse-width modulation circuit after this first voltage signal,
Triangular signal produce circuit for generation of and send triangular signal to pulse-width modulation circuit,
The reference voltage signal of the first voltage signal that pulse-width modulation circuit will receive and this pulse-width modulation circuit inside relatively produces the second voltage signal, and this second voltage signal and triangular signal are relatively produced pwm signal, and this pwm signal is sent to drive circuit
This drive circuit obtains charging control signal according to pwm signal, and this charging control signal is sent to the switching tube circuit,
The switching tube circuit charges to lithium battery under the control of control signal.
Compared with prior art, the present invention has the following advantages:
1, due to the terminal voltage signal that the present invention is based on lithium battery, charging voltage signal and voltage regulation signal and export the first voltage signal, and by pulse-width modulation circuit based on this first voltage signal and reference voltage signal and produce the second voltage signal, the triangular signal that second voltage signal and triangular signal produce the circuit generation relatively produces pwm signal, drive circuit amplifies this pwm signal and obtains charging control signal, charging control signal is used for controlling the charging of lithium battery, second voltage signal and the first voltage signal are the reverse linear relation, when the first voltage signal during greater than reference voltage signal, reference voltage signal deducts the first voltage signal and equals the second voltage signal, if the first voltage signal is output as 0 than reference voltage signal is high, second voltage signal and triangular signal are relatively, produce pulsewidth, the second voltage signal is lower than triangular signal, what export is high, otherwise be low.output is exactly a square wave, during the square wave low level, the switching tube conducting begins charging, during high level, switching tube turn-offs), charging control circuit stops charging, at the first voltage signal during less than reference voltage signal, second voltage signal output low level, charging control circuit is to lithium cell charging, so, in the charging beginning, mode by constant current is to lithium cell charging, when the terminal voltage of lithium battery reaches the magnitude of voltage of setting, mode by constant voltage is to lithium cell charging, charging current is greater than setting electric current, the terminal voltage of lithium battery is during greater than setting voltage, charging control circuit all can disconnect, reach the purpose of constant-current constant-voltage charging, make lithium battery can not affect because of overcharging useful life.
2, because described signal processing circuit comprises source of stable pressure voltage treatment circuit, when source of stable pressure power is very abundant, described lithium cell charging control circuit can be to lithium cell charging, and when source of stable pressure power is not too abundant, can control described pulse-width modulation circuit output pwm signal according to the situation of source of stable pressure power, when source of stable pressure voltage can satisfy charging requirement, charging control circuit was to lithium cell charging; When can not satisfy charging during needs, charging control circuit is to lithium cell charging, and then the protection source of stable pressure reaches the purpose of source of stable pressure voltage follow.When source of stable pressure was the satellite bus, New-type charge control circuit of the present invention had bus and follows function.
Description of drawings
Fig. 1 is the circuit theory diagrams of described lithium cell charging control circuit of the present invention;
Fig. 2 is the circuit theory diagrams of the described signal processing circuit 3 of embodiment four;
Fig. 3 is a kind of particular circuit configurations signal of signal processing circuit 3 inside in Fig. 2;
5 one kinds of particular circuit configurations schematic diagrames of the described drive circuit of Fig. 4 embodiment five;
6 one kinds of particular circuit configurations schematic diagrames of the described pulse-width modulation circuit of Fig. 5 embodiment seven.
Embodiment
Embodiment one, illustrate present embodiment in conjunction with Fig. 1, the described lithium cell charging control circuit of present embodiment comprises that lithium battery 1, current sampling circuit 2, signal processing circuit 3, source of stable pressure 4, drive circuit 5, pulse-width modulation circuit 6, triangular signal produce circuit 7 and switching tube circuit 8
Described source of stable pressure 4 is sent to signal processing circuit 3, drive circuit 5 and switching tube circuit 8 simultaneously with voltage regulation signal,
Triangular signal produce circuit 7 for generation of and send triangular signal to pulse-width modulation circuit 6,
The reference voltage signal of the first voltage signal that pulse-width modulation circuit 6 will receive and this pulse-width modulation circuit 6 inside relatively produces the second voltage signal, and this second voltage signal and triangular signal are relatively produced pwm signal, and this pwm signal is sent to drive circuit 5
This drive circuit 5 obtains charging control signal according to pwm signal, and this charging control signal is sent to switching tube circuit 8,
Switching tube circuit 8 charges to lithium battery 1 under the control of control signal.
The difference of embodiment two, present embodiment and the described lithium cell charging control circuit of embodiment one is, the method that the reference voltage signal of the first voltage signal that pulse-width modulation circuit 6 will receive and this pulse-width modulation circuit 6 inside relatively produces the second voltage signal is:
Described second voltage signal and the first voltage signal are the reverse linear relation,
During greater than reference voltage signal, the second voltage signal is that reference voltage signal deducts the first voltage signal when the first voltage signal,
During less than or equal to reference voltage signal, the second voltage signal is 0V when the first voltage signal.
The difference of embodiment three, present embodiment and the described lithium cell charging control circuit of embodiment one is, the method that second voltage signal and triangular signal relatively produce pwm signal is:
Lower than triangular signal, produce the high level of pwm signal when the second voltage signal;
During greater than or equal to triangular signal, produce the low level of pwm signal when the second voltage signal.
Described output pwm signal is a square wave, and during the square wave low level, the switching tube conducting begins charging, and during high level, switching tube turn-offs.
Embodiment four, referring to Fig. 2, present embodiment is described.The difference of present embodiment and the described lithium cell charging control circuit of embodiment one is, signal processing circuit 3 comprises source of stable pressure voltage treatment circuit 3-1, lithium battery voltage treatment circuit 3-2 and sampled voltage treatment circuit 3-3,
The voltage regulation signal output of source of stable pressure 4 is connected with the voltage regulation signal input of source of stable pressure voltage treatment circuit 3-1;
The terminal voltage of lithium battery 1 is connected with the voltage signal input of lithium battery voltage treatment circuit 3-2;
The voltage signal output end of current sampling circuit 2 is connected with the voltage signal input of sampled voltage treatment circuit 3-3,
The voltage signal output end that the terminal voltage signal output of the lithium battery 1 of the voltage regulation signal output of source of stable pressure voltage treatment circuit 3-1 output, lithium battery voltage treatment circuit 3-2 output is connected with sampled voltage treatment circuit 3-3 all is connected with the voltage signal input of pulse-width modulation circuit 6.
In conjunction with shown in Figure 3, described lithium battery voltage treatment circuit 3-2 comprises the second differential amplifier circuit 3-2-1 and the second diode DC101-1 in the present embodiment.Similar with described monomer voltage treatment circuit 3-1, described the second differential amplifier circuit 3-2-1 comprises the second homophase bleeder circuit, the second anti-phase bleeder circuit of the second operational amplifier UC1-1A, ground connection and is connected in the inverting input of the second operational amplifier UC1-1A and the second resistance R C108-1 between output.The inverting input of this second operational amplifier UC1-1A connects the negative pole of lithium battery 1 by be made of the second anti-phase bleeder circuit resistance R C106-1, in-phase input end connects the positive pole of lithium battery 1 by be made of the second homophase bleeder circuit resistance R C107-1, resistance R C105-1, resistance R C101-1.the positive pole of described the second diode DC101-1 connects the output of the second operational amplifier UC1-1A, the negative pole of described the second diode DC101-1 connects described pulse-width modulation circuit 6, concrete, in the present embodiment, described lithium battery voltage treatment circuit 3-2 also comprises the voltage follower with operational amplifier UC1-1B, the input of described voltage follower connects the output of the second operational amplifier UC1-1A of described the second differential amplifier circuit 3-2-1 by resistance R C110-1, the positive pole of described the second diode DC101-1 is connected in the output of described voltage follower, negative pole connects described pulse-width modulation circuit 6.The temperature that can avoid the second differential amplifier circuit 3-2-1 to occur in the terminal voltage process of amplifying lithium battery 1 that arranges of described voltage follower is floated problem.the terminal voltage of the second described lithium battery 1 of differential amplifier circuit 3-2-1 differential amplification of described lithium battery voltage treatment circuit 3-2 and produce second and amplify voltage, for the ease of narration, the voltage that the second differential amplifier circuit 3-2-1 is transferred to the positive pole of the second diode DC101-1 through described voltage follower also replaces with this second amplification voltage, when second amplifies voltage greater than the threshold voltage of the second diode DC101-1, this second diode DC101-1 conducting, and then, the terminal voltage of described lithium battery transfers to described pulse-width modulation circuit 6 after by differential amplification, when this second when amplifying voltage less than the threshold voltage of the second diode DC101-1, described diode cut-off, the terminal voltage of described lithium battery 1 can not be transferred to described pulse-width modulation circuit 6 after differential amplification.
In conjunction with shown in Figure 3, described sampled voltage treatment circuit 3-3 comprises the 3rd differential amplifier circuit 3-3-1 and the 3rd diode DC501-1, and described the 3rd differential amplifier circuit 3-3-1 comprises the 3rd homophase bleeder circuit, the 3rd anti-phase bleeder circuit of the 3rd operational amplifier UC4-1A, ground connection and is connected in the inverting input of described the 3rd operational amplifier UC4-1A and the 3rd resistance R C507-1 of output.The negative pole of the 3rd operational amplifier UC4-1A connects the negative pole of described current sampling circuit 2 by the 3rd anti-phase bleeder circuit that is made of resistance R C505-1, in-phase input end connects the positive pole of current sampling circuit 2 by be made of the 3rd homophase bleeder circuit with resistance R C501-1 resistance R C506-1, resistance R C504-1.the positive pole of described the 3rd diode DC501-1 connects the output of the 3rd operational amplifier UC4-1A, the negative pole of described the 3rd diode DC501-1 connects described pulse-width modulation circuit 6, concrete, this sampled voltage treatment circuit 3-3 also comprises the voltage follower with operational amplifier UC4-1B, this voltage follower prevents that the temperature that the 3rd differential amplifier circuit 3-3-1 occurs from floating problem in amplifying the charging current process of charge circuit, in such cases, the negative pole of described the 3rd diode DC501-1 connects pulse-width modulation circuit 6, the anodal output that connects the operational amplifier UC4-1B of voltage follower, the in-phase input end of operational amplifier UC4-1B connects the 3rd operational amplifier UC4-1A by resistance R C508-1.in the present invention, the charging current of current sampling circuit 2 sampling circuits and obtain sampled voltage, this sampled voltage of the differential amplification of described the 3rd differential amplifier circuit 3-3-1 and produce the 3rd and amplify voltage, similar with aforementioned monomer voltage treatment circuit 3-1 and lithium battery voltage treatment circuit 3-2, the voltage of the 3rd diode DC501-1 positive pole is amplified the voltage replacement with the 3rd, so, when the 3rd amplifies voltage greater than the threshold voltage of the 3rd diode DC501-1, the 3rd diode DC501-1 conducting, the 3rd difference of amplifying voltage and threshold voltage is transferred to pulse-width modulation circuit 6, when the 3rd amplifies voltage less than the threshold voltage of described the 3rd diode DC501-1, the 3rd diode DC501-1 cut-off, sampled voltage can not be transferred to pulse-width modulation circuit 6.
As shown in Figure 3, this source of stable pressure voltage treatment circuit 3-1 comprises the 4th differential amplifier circuit 3-1-1 and the 4th diode DC301-1, and described the 4th differential amplifier circuit 3-1-1 comprises the 4th homophase bleeder circuit, the 4th anti-phase bleeder circuit of four-operational amplifier UC2-1A, ground connection and is connected in the inverting input of this four-operational amplifier UC2-1A and the 4th resistance R C309-1 between output.The normal phase input end of this operational amplifier UC2-1A is connected with power supply by the 4th homophase bleeder circuit that is made of with resistance R C305-1 resistance R C308-1, resistance R C306-1 at least, in the present embodiment, be connected with+12V power supply, inverting input connects the positive pole (also being referred to as the source of stable pressure positive pole) of described source of stable pressure 4 by the 4th anti-phase bleeder circuit that is made of with resistance R C301-1 resistance R C307-1.The positive pole of described the 4th diode DC301-1 connects the output of described four-operational amplifier UC2-1A, negative pole is connected with described pulse-width modulation circuit 6, concrete, this source of stable pressure voltage treatment circuit 3-1 also comprises voltage follower and filter circuit, this voltage follower comprises operational amplifier UC2-B, is used for preventing that the 4th differential amplifier circuit 3-1-1 from floating problem in the temperature that amplification source of stable pressure voltage course occurs.The negative pole of described the 4th diode DC301-1 connects pulse-width modulation circuit 6, and the output of anodal concatenation operation amplifier UC2-1B, the in-phase input end of operational amplifier UC2-1B connect the output of four-operational amplifier UC2-1A by resistance R C311-1.Filter circuit comprises filter circuit and the capacitor C C302-1 that resistance R C302-1, resistance R C303-1, resistance R C304-1 and capacitor C C303-1 consist of.
Embodiment five, referring to Fig. 4, present embodiment is described.The difference of present embodiment and the described lithium cell charging control circuit of embodiment one is, drive circuit 5 comprises resistance R 18, resistance R 19, resistance R 20, resistance R 21, NPN transistor Q2, PNP transistor Q3 and the first voltage-stabiliser tube D5,
One end of described resistance R 18 is connected with the end that source of stable pressure 4 voltage regulation signal outputs are connected with resistance R simultaneously,
The other end of resistance R 18 simultaneously with the base stage of the base stage of NPN transistor Q2, PNP transistor Q3 be connected the negative electrode of voltage-stabiliser tube D5 and be connected,
The anode of the first voltage-stabiliser tube D5 is connected with the pwm signal output of pulse-width modulation circuit 6,
The other end of resistance R 19 is connected with the collector electrode of NPN transistor Q2,
The emitter of NPN transistor Q2 is connected with the end that the emitter of PNP transistor Q3 is connected with resistance R simultaneously,
The other end of resistance R 21 is connected with the control signal input of switching tube circuit 8,
The collector electrode of PNP transistor Q3 is connected with an end of resistance R 20,
The other end ground connection of resistance R 20.
As shown in Figure 4, described drive circuit 5 amplifies the pwm signal that pulse-width modulation circuit 6 produces, obtain charging control signal, drive circuit 5 comprises the push-pull circuit that NPN transistor Q2 and PNP transistor Q3 consist of, concrete, the base stage of described NPN transistor Q2 and PNP transistor Q3 all is connected in the output of described pulse-width modulation circuit 6, and is concrete, all is connected in pulse-width modulation circuit 6 outputs by diode D5.
The difference of embodiment six, present embodiment and the described lithium cell charging control circuit of embodiment one is, described current sampling circuit 2 is the Hall current sampler.
Embodiment seven, referring to Fig. 5, present embodiment is described.the difference of present embodiment and the described lithium cell charging control circuit of embodiment one is, described pulse-width modulation circuit 6 adopts 7J193 comparator chip to realize, concrete structure comprises resistance R C201-1, resistance R C202-1, resistance R C203-1, resistance R C204-1, resistance R C205-1, resistance R C206-1, resistance R C207-1, resistance R C208-1, capacitor C C201-1, capacitor C C202-1, capacitor C C203-1, the second voltage-stabiliser tube DC201-1, the 5th operational amplifier UC5-1A and comparator UC6-1A
The end of resistance R C201-1 is connected with the 12V power supply with the end of resistance R C204-1 simultaneously,
The other end of resistance R C201-1 simultaneously with the end of resistance R C202-1 be connected the negative electrode of voltage-stabiliser tube DC201-1 and be connected,
The plus earth of the second voltage-stabiliser tube DC201-1,
The other end of resistance R C202-1 is connected with the normal phase input end of the 5th operational amplifier UC5-1A,
The minus earth of the two-phase power supply of the 5th operational amplifier UC5-1A,
The two-phase power supply of the 5th operational amplifier UC5-1A anodal is connected the positive pole of two-phase power supply with the end of the end of the other end of resistance R C204-1, capacitor C C202-1, resistance R C208-1 simultaneously and is connected with comparator UC6-1A,
The negative-phase input of the 5th operational amplifier UC5-1A simultaneously and the end of capacitor C C203-1 be connected an end with resistance R C205-1 and be connected,
The other end of capacitor C C203-1 is connected with the first voltage signal output end of signal processing circuit 3,
The other end of resistance R C205-1 is connected with the end of capacitor C C201-1,
The other end of capacitor C C201-1 simultaneously and the output of the 5th operational amplifier UC5-1A be connected an end with resistance R C206-1 and be connected,
The other end of resistance R C206-1 is connected with the negative-phase input of comparator UC6-1A,
The normal phase input end of comparator UC6-1A is connected with the end of resistance R C207-1,
The other end of resistance R C207-1 is connected with the triangular signal output that triangular signal produces circuit 7,
The minus earth of the two-phase power supply of comparator UC6-1A,
The output of comparator UC6-1A is connected with the pwm signal input that the other end of resistance R C208-1 is connected with drive circuit simultaneously.
Present embodiment uses 7J193 comparator chip to realize the pulse-width modulation circuit all functions, thereby charging control circuit is simple, reliable.
As shown in Figure 5, described 7J193 comparator chip adopts comparator UC6-1A concrete, the 5th operational amplifier UC5-1A inverting input connects the output of described signal processing circuit 3, comparator UC6-1A in-phase input end connects the output that described triangular signal produces circuit 7, in the present embodiment, the 5th operational amplifier UC5-1A inverting input is connected output and is connected with source of stable pressure voltage treatment circuit 3-1 with lithium battery voltage treatment circuit 3-2, sampled voltage treatment circuit 3-3.This pulse-width modulation circuit 6 has reference voltage signal, relatively produce the second voltage signal based on described the first voltage signal and reference voltage signal, the second voltage signal is connected with comparator UC6-1A inverting input, second voltage signal and triangular signal produce relatively output pwm signal of triangular signal that circuit 7 produces, and the maximum in described second voltage signal and lithium battery voltage, sampled voltage and high monomer voltage is linear.in the present embodiment, described the first voltage signal be described first amplify voltage and the first diode threshold voltage poor, second amplify voltage and the difference and the 3rd of the second diode threshold voltage and amplify the maximum in the difference of voltage and the 3rd diode threshold voltage, namely this linear relationship refers to the poor of the first amplification voltage, the second amplification voltage or the 3rd amplification voltage and respective diode threshold voltage, in the situation that possess source of stable pressure voltage treatment circuit 3-1, the first voltage signal is also linear with source of stable pressure voltage, that described the first voltage signal is the poor of described the first amplification voltage and the first diode threshold voltage, second amplifies the poor of voltage and the second diode threshold voltage, the maximum in the difference of the threshold voltage of the difference of the 3rd amplification voltage and the 3rd diode threshold voltage and the 4th amplification voltage and the 4th diode, namely this linear relationship refers to that first amplifies voltage, second amplifies voltage, the 3rd amplifies voltage or the 4th amplifies the poor of voltage and respective diode threshold voltage.
To shown in Figure 5, in inventive embodiment, described source of stable pressure can the satellite bus as Fig. 1, take source of stable pressure be the satellite bus as example, illustrate that the course of work of lithium cell charging control circuit of the present invention is as follows:
1, when bus power is abundant, this is abundant refers to that the power of bus can not only satisfy the need for electricity of other equipment of internal system (other equipment of satellite), can also satisfy the demand of lithium battery 1 charging fully.
in such cases, the voltage of the inverting input of described four-operational amplifier U2C-1A is greater than the voltage of in-phase input end, four-operational amplifier U2C-1A output low level, and then, described the 4th diode DC301-1 cut-off, so, this source of stable pressure voltage treatment circuit 3-1 does not work, and in such cases, the second diode DC101-1 conducting, the output voltage of lithium battery voltage treatment circuit 3-2 is transferred to described pulse-width modulation circuit 6, described pulse-width modulation circuit 6 is output voltage signal and the reference voltage signal of this lithium battery voltage treatment circuit 3-2 relatively, and in the charging starting stage, the output voltage of lithium battery voltage treatment circuit is less than reference voltage signal, so, pulse-width modulation circuit 6 is output as low level, thereby, the beginning charging process.
After charging process began, described current detection circuit 1 detected the charging current in whole loop and charging current is converted into sampled voltage, described the 3rd this sampled voltage of differential amplifier circuit 3-3-1 differential amplification.by the first differential amplifier circuit 3-1-1 is set, the differential mode voltage gain of the second differential amplifier circuit 3-2-1 and the 3rd differential amplifier circuit 3-3-1, can be so that along with the carrying out of charging process, the output voltage of described sampled voltage treatment circuit 3-3 is larger than the output voltage of lithium battery voltage treatment circuit 3-2, like this, the output voltage of described sampled voltage treatment circuit 3-3 is the first voltage signal, described pulse-width modulation circuit 6 relatively produces the second voltage signal with output voltage and the reference voltage signal of sample-based voltage treatment circuit, second voltage signal and triangular signal relatively produce pwm signal, at the output voltage of sampled voltage treatment circuit 3-3 during lower than described reference voltage signal, second voltage signal output LOW voltage, relatively produce the low level of pwm signal with triangular signal, the output voltage of sampled voltage treatment circuit is during higher than described reference voltage signal, second voltage signal output HIGH voltage, and triangular signal relatively produces the high level of pwm signal.This pwm signal is transferred to drive circuit 5, at the positive half period of pwm signal, and the NPN transistor Q21 conducting of described drive circuit 5, PNP transistor Q3 cut-off; At the negative half-cycle of pwm signal, the PNP transistor Q2 conducting of described drive circuit 5, NPN transistor Q3 cut-off, thereby, pwm signal is amplified.In the present embodiment, described charging control signal stops charging when being high level signal, begins charging when charging control signal is low level signal.So, as long as sample rate current is less than setting electric current, namely the output voltage of sampled voltage treatment circuit 3-3 does not surpass reference voltage signal, just can be by source of stable pressure 4 to lithium battery 1 charging, and sample rate current can not charge to lithium battery 1 greater than setting electric current, and, sample rate current equals the low duration of pwm signal less than the time of setting electric current, also equal the time of charging control circuit charging; Sample rate current equals the duration of pwm signal high level greater than the time of setting electric current, also equal the time that charging control circuit stops charging, thereby, reach the purpose of constant current charge.
The triangular signal of the output voltage of lithium battery voltage treatment circuit 3-2 and pulse-width modulation circuit 6 relatively in the process of constant current charge, and make pulse-width modulation circuit 6 output pwm signals, this pwm signal makes charging control circuit charge or stops charging, and then the constant current charge process continues.This process continues to the terminal voltage of lithium battery 1 greater than the terminal voltage of the lithium battery 1 of setting always
Reach the terminal voltage of lithium battery 1 of setting in the charging voltage of lithium battery 1 after, lithium cell charging control circuit of the present invention enters the constant voltage charge pattern, and is specific as follows:
under the constant voltage charge pattern, lithium battery voltage treatment circuit 3-2 and triangular signal relatively produce pwm signal, after drive circuit 5 amplifies this pwm signal, charging control circuit begins charging when the low level of pwm signal, end when high level, that is to say, as long as lithium battery occurring forces down in the situation of the lithium battery voltage of setting, low level will appear in described pwm signal, thereby, charging control circuit begins charging, certainly, in this process, lithium battery is forced down in the time of the terminal voltage of the lithium battery 1 of setting shorter, so, charging interval is also shorter, and then, charging current in such cases will reduce gradually, being generally index law reduces.In the stable situation of the terminal voltage of lithium battery, described pulse-width modulation circuit 6 outputs are always high level, thereby the charging current of whole charge circuit is 0, and charging process finishes.
2, when the power of source of stable pressure is not abundant, this is not abundant refers to that the power of stabilized voltage power supply can satisfy the need for electricity of other equipment of internal system (other equipment of satellite), but can not satisfy the demand of lithium battery 1 charging fully.
in such cases, the positive pole that connects source of stable pressure due to the inverting input of the four-operational amplifier UC2-1A of the 4th differential amplifier circuit 3-1-1 of source of stable pressure voltage treatment circuit 3-1, the voltage of four-operational amplifier UC2-1A inverting input is less than the voltage of in-phase input end, so, four-operational amplifier UC2-1A is output as high level, this high level makes the 4th diode DC301-1 conducting, thereby, source of stable pressure voltage treatment circuit 3-1 can output voltage, the output voltage of described source of stable pressure voltage treatment circuit 3-1 is than the output voltage of battery cell voltage treatment circuit 3-1, the output voltage of the terminal voltage treatment circuit 3-2 of lithium battery 1 is all large, in such cases, described the first voltage signal is the output voltage of source of stable pressure voltage treatment circuit 3-1, so, pulse width modulation circuit 3 relatively output voltage and the triangular signal of this source of stable pressure voltage treatment circuit 3-1 relatively produces pwm signal, this pwm signal makes charging control circuit begin charging or stops charging, how to charge and to stop charging as previously mentioned, do not repeat them here.
And when the voltage of source of stable pressure 4 is very low, the output voltage of described source of stable pressure voltage treatment circuit 3-1 can become large, in such cases, the output voltage of source of stable pressure voltage treatment circuit 3-1 is greater than the reference voltage signal of pulse-width modulation circuit 6, described pulse-width modulation circuit 6 output high level signals, thereby, stop lithium battery 1 charging.
can find out from said process, when the power of source of stable pressure 4 can charge, described charging control circuit can charge to lithium battery 1 because of arranging of source of stable pressure voltage treatment circuit 3-1, when the underpower of source of stable pressure 4, described charging control circuit does not charge to lithium battery 1 because of the setting of source of stable pressure voltage treatment circuit 3-1, like this, in the under powered situation of source of stable pressure 4, protected source of stable pressure 4, and has the function of source of stable pressure voltage follow, when this source of stable pressure is the satellite bus, charging control circuit of the present invention has bus and follows function, can protect bus, do not affect the work of satellite under the prerequisite of guaranteeing to charge.
In sum, be only preferred embodiment of the present invention, when can not limit scope of the invention process with this, therefore the displacement of the change of numerical value or equivalent elements such as, or change and modify according to the equalization that the present patent application the scope of the claims is done, all should still belong to the category that patent of the present invention contains.
Claims (7)
1. lithium cell charging control circuit, it is characterized in that: it comprises that lithium battery (1), current sampling circuit (2), signal processing circuit (3), source of stable pressure (4), drive circuit (5), pulse-width modulation circuit (6), triangular signal produce circuit (7) and switching tube circuit (8)
Signal processing circuit (3) gathers the terminal voltage signal of lithium battery (1);
Current sampling circuit (2) be used for to gather the charging current signal of the charge circuit of lithium battery (1), and this charging current signal is converted into voltage signal is sent to signal processing circuit (3),
Described source of stable pressure (4) is sent to signal processing circuit (3), drive circuit (5) and switching tube circuit (8) simultaneously with voltage regulation signal,
Signal processing circuit (3) compares terminal voltage signal, voltage signal and the voltage regulation signal of the lithium battery (1) that receives, and get maximum signal as the first voltage signal, and will be sent to pulse-width modulation circuit (6) after this first voltage signal,
Triangular signal produce circuit (7) for generation of and send triangular signal to pulse-width modulation circuit (6),
The inner reference voltage signal of the first voltage signal that pulse-width modulation circuit (6) will receive and this pulse-width modulation circuit (6) relatively produces the second voltage signal, and this second voltage signal and triangular signal are relatively produced pwm signal, and this pwm signal is sent to drive circuit (5)
This drive circuit (5) obtains charging control signal according to pwm signal, and this charging control signal is sent to switching tube circuit (8),
Switching tube circuit (8) charges to lithium battery (1) under the control of control signal.
2. lithium cell charging control circuit according to claim 1 is characterized in that: the method that the inner reference voltage signal of the first voltage signal that pulse-width modulation circuit (6) will receive and this pulse-width modulation circuit (6) relatively produces the second voltage signal is:
Described second voltage signal and the first voltage signal are the reverse linear relation,
During greater than reference voltage signal, the second voltage signal is that reference voltage signal deducts the first voltage signal when the first voltage signal,
During less than or equal to reference voltage signal, the second voltage signal is output as 0V when the first voltage signal.
3. lithium cell charging control circuit according to claim 1, it is characterized in that: the method that second voltage signal and triangular signal relatively produce pwm signal is:
Lower than triangular signal, produce the high level of pwm signal when the second voltage signal;
During greater than or equal to triangular signal, produce the low level of pwm signal when the second voltage signal.
4. lithium cell charging control circuit according to claim 1, it is characterized in that: described signal processing circuit (3) comprises source of stable pressure voltage treatment circuit (3-1), lithium battery voltage treatment circuit (3-2) and sampled voltage treatment circuit (3-3),
The voltage regulation signal output of source of stable pressure (4) is connected with the voltage regulation signal input of source of stable pressure voltage treatment circuit (3-1);
The terminal voltage of lithium battery (1) is connected with the voltage signal input of lithium battery voltage treatment circuit (3-2);
The voltage signal output end of current sampling circuit (2) is connected with the voltage signal input of sampled voltage treatment circuit (3-3),
The terminal voltage signal output of the lithium battery (1) of the voltage regulation signal output of source of stable pressure voltage treatment circuit (3-1) output, lithium battery voltage treatment circuit (3-2) output is connected 3-3 with the sampled voltage treatment circuit) voltage signal output end of output all is connected with the voltage signal input of pulse-width modulation circuit (6).
5. lithium cell charging control circuit according to claim 1, it is characterized in that: drive circuit (5) comprises resistance R 18, resistance R 19, resistance R 20, resistance R 21, NPN transistor (Q2), PNP transistor (Q3) and the first voltage-stabiliser tube (D5),
One end of described resistance R 18 is connected with the end that source of stable pressure (4) voltage regulation signal output is connected with resistance R simultaneously,
The other end of resistance R 18 simultaneously with the base stage of the base stage of NPN transistor (Q2), PNP transistor (Q3) be connected the negative electrode of voltage-stabiliser tube (D5) and be connected,
The anode of the first voltage-stabiliser tube (D5) is connected with the pwm signal output of pulse-width modulation circuit (6),
The other end of resistance R 19 is connected with the collector electrode of NPN transistor (Q2),
The emitter of NPN transistor (Q2) is connected with the end that the emitter of PNP transistor (Q3) is connected with resistance R simultaneously,
The other end of resistance R 21 is connected with the control signal input of switching tube circuit (8),
The collector electrode of PNP transistor (Q3) is connected with an end of resistance R 20,
The other end ground connection of resistance R 20.
6. lithium cell charging control circuit according to claim 1, it is characterized in that: described current sampling circuit (2) is the Hall current sampler.
7. lithium cell charging control circuit according to claim 1, it is characterized in that: described pulse-width modulation circuit (6) adopts 7J193 comparator chip to realize, concrete structure comprises resistance R C201-1, resistance R C202-1, resistance R C203-1, resistance R C204-1, resistance R C205-1, resistance R C206-1, resistance R C207-1, resistance R C208-1, capacitor C C201-1, capacitor C C202-1, capacitor C C203-1, the second voltage-stabiliser tube (DC201-1), the 5th operational amplifier (UC5-1A) and comparator (UC6-1A)
The end of resistance R C201-1 is connected with the 12V power supply with the end of resistance R C204-1 simultaneously,
The other end of resistance R C201-1 simultaneously with the end of resistance R C202-1 be connected the negative electrode of voltage-stabiliser tube (DC201-1) and be connected,
The plus earth of the second voltage-stabiliser tube (DC201-1),
The other end of resistance R C202-1 is connected with the normal phase input end of the 5th operational amplifier (UC5-1A),
The minus earth of the two-phase power supply of the 5th operational amplifier (UC5-1A),
The anodal of the two-phase power supply of the 5th operational amplifier (UC5-1A) is connected UC6-1A with the end of the end of the other end of resistance R C204-1, capacitor C C202-1, resistance R C208-1 simultaneously with comparator) the positive pole of two-phase power supply be connected,
The negative-phase input of the 5th operational amplifier (UC5-1A) simultaneously and the end of capacitor C C203-1 be connected an end with resistance R C205-1 and be connected,
The other end of capacitor C C203-1 is connected with the first voltage signal output end of signal processing circuit (3),
The other end of resistance R C205-1 is connected with the end of capacitor C C201-1,
The other end of capacitor C C201-1 simultaneously and the output of the 5th operational amplifier (UC5-1A) be connected an end with resistance R C206-1 and be connected,
The other end of resistance R C206-1 is connected with the negative-phase input of comparator (UC6-1A),
The normal phase input end of comparator (UC6-1A) is connected with the end of resistance R C207-1,
The other end of resistance R C207-1 is connected with the triangular signal output that triangular signal produces circuit (7),
The minus earth of the two-phase power supply of comparator (UC6-1A),
The output of comparator (UC6-1A) is connected 5 with the other end of resistance R C208-1 with drive circuit simultaneously) the pwm signal input be connected.
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| CN201310108240.9A CN103151824B (en) | 2013-03-29 | 2013-03-29 | Lithium cell charging control circuit |
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| CN106655436A (en) * | 2016-12-21 | 2017-05-10 | 苏州格远电气有限公司 | Charging apparatus and charging control method for backup power supply of wind power variable pitch system |
| CN111781506A (en) * | 2020-05-26 | 2020-10-16 | 上海空间电源研究所 | High-precision adjustable lithium battery cell voltage control circuit |
| CN117858305A (en) * | 2023-04-23 | 2024-04-09 | 宁波提视医疗科技有限公司 | Fusion nature collection training appearance circuit |
| CN118337192A (en) * | 2024-06-17 | 2024-07-12 | 欣捷安汽车电子有限公司 | Control circuit, method, equipment and medium based on pulse width modulation signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103457320A (en) * | 2013-08-22 | 2013-12-18 | 电子科技大学 | Lithium ion battery switch charging circuit |
| CN103457320B (en) * | 2013-08-22 | 2015-05-27 | 电子科技大学 | Lithium ion battery switch charging circuit |
| CN106655436A (en) * | 2016-12-21 | 2017-05-10 | 苏州格远电气有限公司 | Charging apparatus and charging control method for backup power supply of wind power variable pitch system |
| CN111781506A (en) * | 2020-05-26 | 2020-10-16 | 上海空间电源研究所 | High-precision adjustable lithium battery cell voltage control circuit |
| CN111781506B (en) * | 2020-05-26 | 2023-02-03 | 上海空间电源研究所 | High-precision adjustable lithium battery cell voltage control circuit |
| CN117858305A (en) * | 2023-04-23 | 2024-04-09 | 宁波提视医疗科技有限公司 | Fusion nature collection training appearance circuit |
| CN118337192A (en) * | 2024-06-17 | 2024-07-12 | 欣捷安汽车电子有限公司 | Control circuit, method, equipment and medium based on pulse width modulation signal |
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