CN101521396A - Microcontrol integrated circuit of charger and power supply circuit using same - Google Patents
Microcontrol integrated circuit of charger and power supply circuit using same Download PDFInfo
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- CN101521396A CN101521396A CN200810082820A CN200810082820A CN101521396A CN 101521396 A CN101521396 A CN 101521396A CN 200810082820 A CN200810082820 A CN 200810082820A CN 200810082820 A CN200810082820 A CN 200810082820A CN 101521396 A CN101521396 A CN 101521396A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to a microcontrol integrated circuit of a charger and a power supply circuit using same. The integrated circuit comprises an analog-to-digital converter, a microprocessor, a comparator and a pulse generator. The analog-to-digital converter is used for receiving a feedback voltage of a power converter and converting the feedback voltage into feedback data; the microprocessor is used for outputting an impulse width adjusting signal according to the feedback data; the comparator is used for receiving a reference voltage and the feedback voltage so as to enable a control signal when the feedback voltage is reach or larger than the reference voltage; and the pulse generator is used for adjusting the impulse width according to the impulse width adjusting signal so as to stop outputting the impulse when the control signal is enabled.
Description
Technical field
The invention relates to the technology that a kind of power electronics is relevant, and particularly relevant for a kind of charging micro-control integrated circuit of built-in protective circuit and the power supply unit that uses this integrated circuit.
Background technology
In recent years, because the progress of science and technology, power supply circuit begins to be applied in widely on the various power supply equipment.Also because the popularizing of running gear, various battery, for example nickel-cadmium cell, lead-acid battery, Ni-MH battery and lithium battery also are developed thereupon.Many manufacturers also utilize power supply circuit to develop many charge prepds.
Different batteries has different charge characteristics, and for example nickel-cadmium cell can bear and overcharge, and Ni-MH battery and lithium battery can't bear and overcharge.Especially lithium battery if overcharge or short circuit, can cause battery temperature to raise, and destroy battery structure, may make battery explosion at last.Therefore, charge prepd need design and prevent the overvoltage charging.Therefore, charge prepd usually needs to use charging micro-control integrated circuit.
Fig. 1 is the circuit diagram of known applications in the power supply circuit of battery charge.Please refer to Fig. 1, this power supply circuit comprises power supply changeover device 11, power control circuit 12, four switch SW 1～SW4, four battery insertion groove SL1～SL4 and four testing circuit DT1～DT4, wherein, power control circuit 12 comprises microprocessor 121 and pulse generator 122.Because being inserted in the battery variety of battery insertion groove SL1～SL4 may be different, required charging strategy also can be different, for example nickel-cadmium cell can bear the charging of high voltage, but Ni-MH battery and lithium battery just can't bear the charging above its rated voltage, therefore need four testing circuit DT1～DT4 to detect the kind of battery respectively, and repay and give microprocessor 121.
In addition, may be different owing to be inserted in the number of batteries of battery insertion groove SL1～SL4, therefore need four testing circuit DT1～DT4 and 4 switches.When supposing that slot SL1 and SL4 plug battery, testing circuit DT1 and DT4 just can detect slot SL1 and SL4 and plug battery, and enable signal DS1 and DS4, make microprocessor 121 learn that slot SL1 and SL4 plug battery.Microprocessor 121 is according to the signal DS1 and the DS4 that receive, and control switch SW2 and SW3 short circuit make the circuit turn-on between slot SL1 and the SL4.
Owing to be applied to the power supply circuit of battery charge, must control the size of its voltage exported and electric current comparatively accurately, therefore need to use the control that microprocessor 121 is done pulsewidth.Yet, the reaction time of microprocessor is slow compared to the reaction time of analog circuit, when the voltage of power supply changeover device 11 output when too high or its electric current of exporting rises suddenly suddenly, microprocessor 121 will have little time reaction and give pulse generator 122, so that therefore circuit may burn.What is more, may cause battery explosion, breaking out of fire.
Summary of the invention
In view of this, purpose of the present invention just provides a kind of charging micro-control integrated circuit, and the rechargeable battery that charges in order to avoid burns.
Purpose of the present invention just provides a kind of power supply unit, in order to simplify production procedure and to reduce the element cost.
For reaching above-mentioned or other purposes, the present invention proposes a kind of power supply unit.This power supply unit comprises power supply changeover device and charging micro-control integrated circuit of the present invention.Power supply changeover device is in order to be supplied to the output voltage and the output current of battery with decision according to pulse.Charging micro-control integrated circuit of the present invention comprises first analog-digital converter, microprocessor first comparator and pulse generator.First analog-digital converter receives first feedback voltage of power supply changeover device, is converted to the first back coupling data.Microprocessor couples first analog-digital converter, and according to the first back coupling data, output pulse width is adjusted signal.The first input end of first comparator receives first reference voltage, its second input receives first feedback voltage, and its output couples pulse generator, and exports first control signal, when first feedback voltage reaches or during greater than first reference voltage, enables first control signal.Pulse generator couples the microprocessor and first comparator, adjusts signal according to pulsewidth, adjusts the pulse duration of pulse.When first control signal enabled, pulse generator stopped to export pulse.
According to described power supply unit of preferred embodiment of the present invention and charging micro-control integrated circuit, above-mentioned feedback voltage and output voltage are proportional, and charging micro-control integrated circuit also comprises second comparator, its first input end receives second reference voltage, its second input receives second feedback voltage, its output couples pulse generator, and exports second control signal.When second feedback voltage reaches or during greater than second reference voltage, second comparator enables second control signal, wherein, second feedback voltage and output current are proportional, and pulse generator receives second control signal.When second control signal enabled, pulse generator stopped to export described pulse.
According to described power supply unit of preferred embodiment of the present invention and charging micro-control integrated circuit, above-mentioned charging micro-control integrated circuit also comprises two generating circuit from reference voltage, one is coupled between the microprocessor and first comparator, and another is coupled between the microprocessor and second comparator.It is the voltage control signal in order to export according to microprocessor respectively, determines the size of first reference voltage and second reference voltage.
According to described power supply unit of preferred embodiment of the present invention and charging micro-control integrated circuit, above-mentioned charging micro-control integrated circuit also comprises second analog-digital converter.Second analog-digital converter receives second feedback voltage of power supply changeover device, be converted to the second back coupling data, wherein, second feedback voltage and output current are proportional, and microprocessor couples second analog-digital converter, according to the first back coupling data and the second back coupling data, output pulse width is adjusted signal.In an embodiment, charging micro-control integrated circuit also comprises amplifier, couples second analog-digital converter, in order to amplify second feedback voltage.
Spirit of the present invention is to be to integrate comparator and pulse generator in single-chip, control the slow excessively situation of pulse-width modulation (PWM) reaction speed except that solving existing software and the microprocessor of utilizing, also but simplified system design and production procedure improve advantages such as the rate that manufactures a finished product.With existing technology, still there is not the special-purpose single-chip of so integrating that is applied to charger.
Description of drawings
Fig. 1 is the circuit diagram of known applications in the power supply circuit of battery charge.
Fig. 2 is the circuit diagram of the power supply circuit that is used for charging system that illustrates according to the embodiment of the invention.
Fig. 3 is the power supply circuit that illustrates according to the embodiment of the invention and the circuit diagram of charging micro-control integrated circuit 21.
Fig. 4 is the power supply circuit that illustrates according to the embodiment of the invention and the circuit diagram of charging micro-control integrated circuit 21.
Drawing reference numeral:
11,20: power supply changeover device
12: power control circuit
SW1～SW4: switch
SL1～SL4: battery insertion groove
DT1～DT4: testing circuit
121,211: microprocessor
122,213: pulse generator
21: charging micro-control integrated circuit
210,301: analog-digital converter
212,302: comparator
B: battery
R1, R2, R3: resistance
VG1, VG2: reference voltage generator
303,401: amplifier
Embodiment
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly is described in detail below.
Fig. 2 is the circuit diagram of the power supply circuit that is used for charging system that illustrates according to the embodiment of the invention.Please refer to Fig. 2, this power supply circuit comprises power supply changeover device 20, charging micro-control integrated circuit 21 and battery detection circuit 22, and wherein this charging micro-control integrated circuit 21 comprises analog-digital converter 210, microprocessor 211, comparator 212 and pulse generator 213.In addition, in this circuit, illustrate the load of rechargeable battery B as this power supply unit, divider resistance R1 and R2 are to provide charging micro-control integrated circuit 21 feedback voltage Vfb, so that the explanation present embodiment.The relation of coupling as the figure of this power supply circuit illustrate.
When general operation, battery detection circuit 22 can transmit the state of rechargeable battery B and give microprocessor 211; Microprocessor 211 is according to the state of the rechargeable battery B that is returned and the responsibility cycle of feedbacking the data Dfb decision pulse P that pulse generator 213 is exported; 20 sizes of power supply changeover device according to this pulse P decision output voltage V out; The dividing potential drop that output voltage V out sees through resistance R 1 and R2 produces feedback voltage Vfb; Analog-digital converter 210 is converted to back coupling data Dfb with feedback voltage Vfb as analog digital.So according to above-mentioned closed-loop path ongoing operation.
Yet when suddenly rising of output voltage V out, feedback voltage Vfb can reach or greater than built-in reference voltage Vref, made the control signal Cs1 of comparator 212 outputs be in logic high voltage this moment.When pulse generator 213 when control signal Cs1 is in logic high voltage, just can stop to export pulse PWM immediately, the output voltage that power supply changeover device 20 is exported also can in time descend, and avoids rechargeable battery B to produce blast.
What deserves to be mentioned is, though in the foregoing description charging micro-control integrated circuit 21 and the power supply circuit to the embodiment of the invention depicted a possible kenel, but this area related personnel should know, the design of charging micro-control integrated circuit 21 and coupling mode are all different, and therefore application of the present invention is when being not restricted to the possible kenel of this kind.In other words, so long as, determine whether stopping to export pulse PWM, be to have met spiritual place of the present invention just in order to compare this reference voltage Vref and feedback voltage Vfb at charging micro-control integrated circuit 21 inner built-in at least one comparator 212.
Next just again for several embodiment so that this area related personnel can utilize spirit of the present invention to implement the present invention.
Fig. 3 is the power supply circuit that illustrates according to the embodiment of the invention and the circuit diagram of charging micro-control integrated circuit 21.In this circuit diagram, more than the charging micro-control integrated circuit 21 analog-digital converter 301, comparator 302, amplifier 303 and two reference voltage generator VG1 and VG2.In addition, feedback, between battery and ground connection, also coupled a resistance R 3 in order to make electric current.The relation that couples of this circuit as shown in the figure.
This embodiment detects the resistance R 3 of load current and plug-in amplifier 303, in order to make electric current back coupling Ifb.Because lithium battery may be too fast because of chemical reaction if accept the charging of too big electric current, produces gas, and then influence its battery capacity and life-span, therefore need electric current back coupling Ifb to judge whether the load current that flows through is excessive, with the responsibility cycle of control impuls PWM, and then the control load electric current.For the efficient of charger, resistance R 3 can be used less resistance usually, and relative, the voltage drop Vr3 that it produced is less, and the therefore extra amplifier 303 that increases can amplify this voltage Vr3 makes analog-digital converter 301 normal operations.
When operating at ordinary times, microprocessor can be feedback data Dfb1 and feedback data Dfb2 according to the electric current that output current produced and come control impuls generator 213 according to the voltage that is produced according to output voltage V out that analog- digital converter 210 and 301 is transmitted.When output current becomes big suddenly, can become big at the voltage drop Vr3 of resistance R 3.When this voltage Vr3 arrives or greater than the reference voltage Vref 2 that VG2 produced, comparator 302 can make control signal Cs2 enable, and pulse generator 213 just can stop to export pulse PWM.
Fig. 4 is the power supply circuit that illustrates according to the embodiment of the invention and the circuit diagram of charging micro-control integrated circuit 21.Please refer to Fig. 4, this circuit is compared to Fig. 3, and charging micro-control integrated circuit 21 has additionally been integrated amplifier 401, with amplified current feedback voltage Ifb.Because this charging micro-control integrated circuit 21 has been integrated amplifier 401, therefore, the number that can save plug-in part that the power supply circuit of this embodiment is relative, and the complexity of attenuating printed circuit board layout.
Though the foregoing description all uses a battery to come for example as load, this area related personnel should be known in that spirit of the present invention can be applied in the charging of a plurality of batteries equally.This area the related personnel should also be appreciated that, above-mentioned comparator 212 and 302 positive-negative input end can also change its polarity according to the selection of design.In addition, the amplifier 401 of Fig. 4 can also be coupled between resistance R 3 and the comparator 302.Therefore the foregoing description does not limit spirit of the present invention.
In sum, spirit of the present invention is to be to integrate comparator and pulse generator in single-chip, control the slow excessively situation of pulse-width modulation (PWM) reaction speed except that solving existing software and the microprocessor of utilizing, but also simplified system design and production procedure improves advantages such as the rate that manufactures a finished product.With existing technology, still there is not the special-purpose single-chip of so integrating that is applied to charger.
In addition, in an embodiment of the present invention, wafer indoor design reference voltage generator, and cooperate two groups of voltage comparators can be closed pulse signal PWM when detecting voltage or electric current and reach specification, to reach the purpose of voltage stabilizing or current stabilization.At ordinary times inside can via microprocessor with and software see through analog-digital converter voluntarily and detect voltage and feedback and the electric current feedback signal, operating frequency and the responsibility cycle of decision PWM, so integrated circuit can reach the effect of high degree of integration.
The specific embodiment that is proposed in the detailed description of preferred embodiment is only in order to convenient explanation technology contents of the present invention, but not with narrow sense of the present invention be limited to the foregoing description, in the scope that does not exceed spirit of the present invention and claims, the many variations of being done is implemented, and all belongs to scope of the present invention.
Claims (12)
1. charging micro-control integrated circuit is supplied to the output voltage and the output current of battery in order to the output pulse with the control power supply changeover device, it is characterized in that described charging micro-control integrated circuit comprises:
First analog-digital converter receives first feedback voltage of described power supply changeover device, is converted to first and feedbacks data;
Microprocessor couples described first analog-digital converter, and according to the described first back coupling data, output pulse width is adjusted signal;
First comparator, its first input end receives first reference voltage, its second input receives described first feedback voltage, its output couples described pulse generator, and export first control signal, when described first feedback voltage reaches or during greater than described first reference voltage, enables described first control signal; And
Pulse generator couples described microprocessor and described first comparator, adjusts signal according to described pulsewidth, adjusts the pulse duration of described pulse, when described first control signal enables, stops to export described pulse.
2. charging micro-control integrated circuit as claimed in claim 1 is characterized in that, described feedback voltage and described output voltage are proportional, and described charging micro-control integrated circuit also comprises:
Second comparator, its first input end receives second reference voltage, its second input receives second feedback voltage, its output couples described pulse generator, and export second control signal, when described second feedback voltage reaches or during greater than described second reference voltage, enables described second control signal
Wherein, described second feedback voltage and described output current are proportional, and described pulse generator receives described second control signal, and when described second control signal enabled, described pulse generator stopped to export described pulse.
3. charging micro-control integrated circuit as claimed in claim 2 is characterized in that, described charging micro-control integrated circuit also comprises:
Generating circuit from reference voltage is coupled between described microprocessor and described second comparator, according to the voltage control signal that described microprocessor is exported, determines the size of described second reference voltage.
4. charging micro-control integrated circuit as claimed in claim 1 is characterized in that, described charging micro-control integrated circuit also comprises:
Second analog-digital converter receives second feedback voltage of described power supply changeover device, and be converted to second and feedback data,
Wherein, described second feedback voltage and described output current are proportional, and described microprocessor couples described second analog-digital converter, feedback data and described second according to described first and feedback data, and output pulse width is adjusted signal.
5. charging micro-control integrated circuit as claimed in claim 4 is characterized in that, described charging micro-control integrated circuit also comprises:
Amplifier couples described second analog-digital converter, in order to amplify described second feedback voltage.
6. the described charging micro-control integrated circuit of claim 1 is characterized in that, described charging micro-control integrated circuit also comprises:
Generating circuit from reference voltage is coupled between described microprocessor and described first comparator, according to the voltage control signal that described microprocessor is exported, determines the size of described first reference voltage.
7. a power supply unit is characterized in that, described power supply unit comprises:
Power supply changeover device is in order to be supplied to the output voltage and the output current of battery with decision according to pulse; And
Charging micro-control integrated circuit comprises:
First analog-digital converter receives first feedback voltage of described power supply changeover device, is converted to first and feedbacks data;
Microprocessor couples described first analog-digital converter, and according to the described first back coupling data, output pulse width is adjusted signal;
First comparator, its first input end receives first reference voltage, its second input receives described first feedback voltage, its output couples described pulse generator, and export first control signal, when described first feedback voltage reaches or during greater than described first reference voltage, enables described first control signal; And
Pulse generator couples described microprocessor and described first comparator, adjusts signal according to described pulsewidth, adjusts the pulse duration of described pulse, when described first control signal enables, stops to export described pulse.
8. power supply unit as claimed in claim 7 is characterized in that, described feedback voltage and described output voltage are proportional, and described charging micro-control integrated circuit also comprises:
Second comparator, its first input end receives second reference voltage, its second input receives second feedback voltage, its output couples described pulse generator, and export second control signal, when described second feedback voltage reaches or during greater than described second reference voltage, enables described second control signal
Wherein, described second feedback voltage and described output current are proportional, and described pulse generator receives described second control signal, and when described second control signal enabled, described pulse generator stopped to export described pulse.
9. power supply unit as claimed in claim 8 is characterized in that, described power supply unit also comprises:
Generating circuit from reference voltage is coupled between described microprocessor and described second comparator, according to the voltage control signal that described microprocessor is exported, determines the size of described second reference voltage.
10. power supply unit as claimed in claim 7 is characterized in that, described power supply unit also comprises:
Second analog-digital converter receives second feedback voltage of described power supply changeover device, and be converted to second and feedback data,
Wherein, described second feedback voltage and described output current are proportional, and described microprocessor couples described second analog-digital converter, and according to described first back coupling data and the described second back coupling data, output pulse width is adjusted signal.
11. power supply unit as claimed in claim 10 is characterized in that, described power supply unit also comprises:
Amplifier couples described second analog-digital converter, in order to amplify described second feedback voltage.
12. power supply unit as claimed in claim 7 is characterized in that, described power supply unit also comprises:
Generating circuit from reference voltage is coupled between described microprocessor and described first comparator, according to the voltage control signal that described microprocessor is exported, determines the size of described first reference voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810082820A CN101521396A (en) | 2008-02-28 | 2008-02-28 | Microcontrol integrated circuit of charger and power supply circuit using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810082820A CN101521396A (en) | 2008-02-28 | 2008-02-28 | Microcontrol integrated circuit of charger and power supply circuit using same |
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| Publication Number | Publication Date |
|---|---|
| CN101521396A true CN101521396A (en) | 2009-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810082820A Pending CN101521396A (en) | 2008-02-28 | 2008-02-28 | Microcontrol integrated circuit of charger and power supply circuit using same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107562A (en) * | 2011-11-09 | 2013-05-15 | 珠海全志科技股份有限公司 | Switch charging circuit and power management system |
| CN106842046A (en) * | 2017-01-21 | 2017-06-13 | 深圳市沃特玛电池有限公司 | battery capacity detection circuit |
-
2008
- 2008-02-28 CN CN200810082820A patent/CN101521396A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107562A (en) * | 2011-11-09 | 2013-05-15 | 珠海全志科技股份有限公司 | Switch charging circuit and power management system |
| CN103107562B (en) * | 2011-11-09 | 2014-12-31 | 珠海全志科技股份有限公司 | Switch charging circuit and power management system |
| CN106842046A (en) * | 2017-01-21 | 2017-06-13 | 深圳市沃特玛电池有限公司 | battery capacity detection circuit |
| CN106842046B (en) * | 2017-01-21 | 2022-01-07 | 深圳安鼎新能源技术开发有限公司 | Battery capacity detection circuit |
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Application publication date: 20090902 |