CN105375541A - Switching type charging circuit - Google Patents
Switching type charging circuit Download PDFInfo
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- CN105375541A CN105375541A CN201410432012.1A CN201410432012A CN105375541A CN 105375541 A CN105375541 A CN 105375541A CN 201410432012 A CN201410432012 A CN 201410432012A CN 105375541 A CN105375541 A CN 105375541A
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- Prior art keywords
- power management
- management chip
- charging
- voltage
- output
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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
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a switching type charging circuit, which comprises a power management chip, a processor and a feedback circuit. The power management chip is used for charging a battery at different power output quantities. The processor is used for outputting a control signal so as to control the operation of the power management chip and provides a preset current value and a preset voltage value. The feedback circuit receives the preset current value and the preset voltage value to conduct the voltage comparison and the current comparison, and then supplies a feedback signal to the power management chip according to the comparison result so as to adjust the power output quantity of the power management chip. When the charging current of the battery is larger than the preset current value or the charging voltage of the battery is larger than the preset voltage value, the power output quantity is reduced. When the charging current of the battery is smaller than the preset current value or the charging voltage of the battery is smaller than the preset voltage value, the power output quantity is increased. According to the invention, through additionally arranging the power management chip, the charging circuit is controlled. Therefore, the charging efficiency is effectively improved, and the unnecessary power loss is reduced.
Description
Technical field
The present invention relates to charging circuit, particularly relate to the switch type charging circuit that a kind of power supply chip controls.
Background technology
In the system platform of portions of electronics product, the general framework of linear charging block that adopts is as charging circuit.Under normal conditions, the charge efficiency of linear charging block is not high, and in charging process, input voltage and cell voltage have a voltage difference changed, this voltage difference mainly drops on the electronic device between input to battery, cause unnecessary energy loss, when particularly charging current is larger, this energy loss can be larger.
Summary of the invention
In view of this, the switch type charging circuit that a kind of power supply chip controls need be provided, to improve the framework of linear charging block, thus improve charge efficiency and reduce unnecessary energy loss.
A kind of switch type charging circuit that embodiment of the present invention provides comprises power management chip, processor, feedback circuit.Wherein, power management chip is used for charging to battery with different horsepower outputs; Whether processor works for exporting control signal to control power management chip and provides pre-set current value and preset voltage value; Feedback circuit is connected between power management chip, processor and battery, current ratio is carried out comparatively and voltage compare provide according to comparative result and feed back signal to power management chip with the pre-set current value of receiving processor and preset voltage value, thus the horsepower output of adjustment power management chip; When power management chip charging voltage that is larger than pre-set current value in the charging current of battery or battery is larger than preset voltage value reduce horsepower output, charging current than pre-set current value little or charging voltage is less than preset voltage value time increase horsepower output.
Preferably, switch type charging circuit also comprises a switching circuit, and switching circuit is electrically connected between power management chip and processor to control the work of power management chip.
Preferably, switching circuit comprises switch element, switch element comprises the first conduction terminal, the second conduction terminal and controlled end, first conduction terminal is electrically connected the Enable Pin of power management chip, second conduction terminal ground connection, whether controlled end is electrically connected process device and works to control power management chip with the control signal of receiving processor.
Preferably, switch element is field effect transistor, and the drain electrode of field effect transistor, source electrode and grid are respectively as the first conduction terminal, the second conduction terminal and controlled end.
Preferably, switching circuit also comprises the first resistance, and the first resistance is electrically connected between the first conduction terminal and the input of power management chip.
Preferably, feedback circuit comprises blender, the first error amplifier, the second error amplifier, the 3rd error amplifier, the first digital to analog converter and the second digital to analog converter.The two ends that the first input end of the first error amplifier and the second input are connected to sample resistance are with the charging current of battery and export amplified current; The input of the first digital to analog converter is electrically connected process device with the pre-set current value of receiving processor and is converted to required current reference value; The first input end of the second error amplifier is electrically connected the output of the first error amplifier, second input is electrically connected the output of the first digital to analog converter, and the second error amplifier is used for amplified current and current reference value to compare and output current comparative result; The input of the second digital to analog converter is electrically connected process device, and the preset voltage value for being sent by processor is converted to required voltage reference value; The first input end of the 3rd error amplifier is electrically connected the input of battery to obtain the charging voltage of battery, second input is electrically connected the output of the second digital to analog converter, and the first error amplifier is used for charging voltage and voltage reference value to compare and output voltage comparative result; The input of blender is connected to the output of the second error amplifier and the output of the 3rd error amplifier, the output of blender is electrically connected the feedback end of power management chip, and blender is used for processing electric current comparative result and voltage compare result and feeding back to power management chip.
Preferably, feedback circuit also comprises feedback resistance, and the first end of feedback resistance is connected with the output of blender, and the second end of feedback resistance connects the feedback end of power management chip.
Preferably, feedback circuit also comprises the second resistance, the 3rd resistance and electric capacity, and electric capacity is connected with the second resistor coupled in parallel with after the 3rd resistant series, and then connects feedback resistance second end to adjust the voltage of feedback resistance.
Preferably; switch type charging circuit also comprises the first field effect transistor; first conduction terminal of the first field effect transistor is electrically connected power management chip output; second conduction terminal of the first field effect transistor connects the input of battery; the controlled end connection handling device of the first field effect transistor, the first field effect transistor is for adjusting charging current to protect battery.
Preferably, the first field effect transistor is high-power field effect pipe, and the drain electrode of high-power field effect pipe, source electrode and grid are respectively as the first conduction terminal of the first field effect transistor, the second conduction terminal and controlled end.
Above-mentioned switch type charging circuit controls charging circuit by setting up power supply chip, thus effectively improves charge efficiency and reduce unnecessary energy loss.
Accompanying drawing explanation
Fig. 1 is the schematic diagram in switch type charging circuit one execution mode of the present invention.
Main element symbol description
Power management chip 100
Processor 200
Switching circuit 300
Feedback circuit 400
Battery 500
Input IN
Output OUT
Enable Pin EN
Feedback end FB
First field effect transistor M1
Switch element M2
First resistance R1
Second resistance R2
3rd resistance R3
Sample resistance Rs
Feedback resistance Rf
Electric capacity C1
Blender U1
First error amplifier U2
Second error amplifier U3
3rd error amplifier U4
First digital to analog converter DAC1
Second digital to analog converter DAC2
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
Fig. 1 is the module diagram of an embodiment of the present invention switch type charging circuit.In the present embodiment, switch type charging circuit is used for charging to battery, and it comprises power management chip 100, processor 200, switching circuit 300, feedback circuit 400 and battery 500.Wherein, power management chip 100 charges to battery 500 with the electric energy exporting different capacity for carrying out power management according to external feedback information, processor 200 is for exporting control command to control power management chip 100, the input IN of power management chip 100 and processor 200 are all electrically connected external charging power supply to receive power supply signal, switching circuit 300 is electrically connected between the Enable Pin EN of power management chip 100 and processor 200 with the control signal of receiving processor 200, and then control power management chip 100, feedback circuit 400 is connected to power management chip 100, power management chip 100 is fed back signal to obtain the corresponding signal of telecommunication and to provide between processor 200 and battery 500, thus regulate the power stage of power management chip output OUT.In the present embodiment, when Enable Pin EN receives low level signal, power management chip 100 stops exporting electric energy; When Enable Pin EN receives high level signal, power management chip 100 continues to export electric energy.
In addition; first conduction terminal of the first field effect transistor M1 connects the output OUT of power management chip 100 via sample resistance Rs and inductance L 1; second conduction terminal connects the input of battery 500; controlled end connection handling device 200; inductance L 1 is for energy storage; in charging process, the adjustment signal of the first field effect transistor M1 receiving processor 200 adjusts the charging current of battery to protect battery 500 in good time.In the present embodiment, the first field effect transistor M1 is high-power field effect pipe, and the drain electrode of high-power field effect pipe, source electrode and grid are respectively as first conduction terminal of the first field effect transistor M1, the second conduction terminal and controlled end.
Switching circuit 300 comprises the first resistance R1 and switch element M2 further, switch element M2 comprises the first conduction terminal, the second conduction terminal and controlled end, wherein first conduction terminal of switch element M2 is electrically connected the Enable Pin EN of power management chip 100 and is electrically connected external charging power supply via the first resistance R1, the second conduction terminal ground connection of switch element M2, the controlled end of switch element M2 is electrically connected process device 200 with reception control signal and controls power management chip 100.In the present embodiment, switch element M2 is a field effect transistor, and its first conduction terminal, the second conduction terminal and controlled end correspond respectively to the drain electrode of field effect transistor, source electrode and grid.When charging abnormal, processor 200 exports high level to switch element M2, then switch element M2 conducting, thus make the Enable Pin EN of power management chip 100 receive low level signal, power management chip 100 stops exporting electric energy to stop the charging to battery 500.In other embodiments, other controlled switchs or triode composition switching circuit 300 can also be used.
Feedback circuit 400 comprises blender U1, the first error amplifier U2, the second error amplifier U3, the 3rd error amplifier U4, the first digital to analog converter DAC1, the second digital to analog converter DAC2, electric capacity C1, the second resistance R2, the 3rd resistance R3 and feedback resistance Rf further.
Wherein, first input end and second input of the first error amplifier U2 are connected the two ends of sample resistance Rs respectively to obtain the charging current of battery and to export amplified current, the output of the first error amplifier U2 is electrically connected the first input end of the second error amplifier U3, the pre-set current value that the input connection handling device 200 of the first digital to analog converter DAC1 sends with receiving processor 200.Second input of the second error amplifier U3 is electrically connected the output of the first digital to analog converter DAC1, and the output of the second error amplifier U3 connects an input of blender U1.At this, first digital to analog converter DAC1 is used for the current reference value be converted to by the pre-set current value that processor 200 sends needed for the second error amplifier U3, the pre-set current value that processor 200 sends can set according to the actual requirements, wherein pre-set current value and current reference value positive correlation, the second error amplifier U3 be used for amplified current and current reference value to compare also output current comparative result to blender U1.
The output of blender U1 is connected with the first end of feedback resistance Rf, and blender U1 connects the signal feedback end FB of power management chip 100 with output feedback signal via second end of feedback resistance Rf.Be connected in parallel with the second resistance R2 after electric capacity C1 in feedback circuit 400 connects with the 3rd resistance R3, and then second end of connection feedback resistance Rf is to adjust the voltage of feedback resistance Rf.Blender U1 be used for electric current comparative result and voltage compare result carry out process and output feedback signal to the feedback end FB of power management chip 100.
When feedback circuit carry out current ratio comparatively time, if the charging current of battery is larger than pre-set current value, the feedback signal that power management chip receives is just large, and power management chip will reduce horsepower output; If the charging current of battery is less than pre-set current value, the feedback signal that power management chip receives is just little, and power management chip will increase horsepower output.
Specifically, the first error amplifier U2 obtains the charging current of battery from sample resistance Rs two ends and exports amplified current to the second error amplifier U3, wherein, and the amplified current positive correlation of the electric current in circuit and output.Electric current after amplification compares and output current comparative result with current reference value by the second error amplifier U3.When the charging current of battery is larger than current reference value, the electric current comparative result that second error amplifier U3 exports is larger positive voltage value, the value that blender U1 exports also is larger positive voltage value, the signal feedback end FB of power management chip 100 receives the magnitude of voltage be elevated, thus reduce the horsepower output of its output OUT, at this, signal feedback end FB receives larger magnitude of voltage, and the horsepower output of output OUT is less; When the charging current of battery is less than pre-set current value, the electric current comparative result that second error amplifier U3 exports is less negative value, the value that blender U1 exports also is less negative value, the signal feedback end FB of power management chip 100 receives by the magnitude of voltage dragged down, thus increase the horsepower output of output OUT, at this, signal feedback end FB receives less magnitude of voltage, and the horsepower output of its output OUT is larger.In the present embodiment, charging current and the pre-set current value difference of battery are larger, then the value of the electric current comparative result exported is larger, and finally this current ratio is also larger to the value of the signal feedback end FB of power management chip 100 compared with result feedback.
The first input end of the 3rd error amplifier U4 connects the charging voltage of the input acquisition battery of battery 500, second input of the 3rd error amplifier U4 is electrically connected the output of the second digital to analog converter DAC2, and the output of the 3rd error amplifier U4 is electrically connected another input of blender U1.The input of the second digital to analog converter DAC2 is electrically connected the preset voltage value processing device 200 and send with receiving processor 200, at this, second digital to analog converter DAC2 is used for the voltage reference value be converted to by the preset voltage value that processor 200 sends needed for the 3rd error amplifier U4, the preset voltage value that processor 200 sends can set according to the actual requirements, wherein preset voltage value and voltage reference value positive correlation.In the present embodiment, the 3rd error amplifier U4 is used for cell voltage and voltage reference value to compare and output voltage comparative result.
When feedback circuit carries out voltage compare, if the charging voltage of battery is larger than preset voltage value, the feedback signal that power management chip receives is just large, and power management chip will reduce horsepower output; If the charging voltage of battery is less than preset voltage value, the feedback signal that power management chip receives is just little, and power management chip will increase horsepower output.
Specifically, the 3rd error amplifier U4 obtains the cell voltage of battery 500 from charging circuit, and is compared with preset voltage value by the cell voltage of acquisition.When cell voltage is larger than preset voltage value, the voltage compare result that 3rd error amplifier U4 exports is positive voltage value, the value that blender U1 exports also is positive voltage value, the signal feedback end FB of power management chip 100 receives the magnitude of voltage be elevated, thus reduces the horsepower output of output OUT; When voltage ratio preset voltage value hour, the voltage compare result that 3rd error amplifier U4 exports is negative value, the value that blender U1 exports also is negative value, and the signal feedback end FB of power management chip 100 receives by the magnitude of voltage dragged down, thus increases the horsepower output of output OUT.In the present embodiment, the size of cell voltage and the difference in size of predeterminated voltage larger, then the value of the voltage compare result exported is larger, and this voltage compare result feedback is also larger to the value of the signal feedback end FB of power management chip 100.
In the present embodiment, the signal feedback end FB of power management chip 100 can according to the output of the size adjustment output OUT of feedback signal.
Above-mentioned switch type charging circuit by improveing the framework of linear charging block, thus improves charge efficiency and reduces unnecessary energy loss.
Claims (10)
1. a switch type charging circuit, for charging to battery, is characterized in that, comprising:
Power management chip, for charging to described battery with different horsepower outputs;
Whether processor, work for exporting control signal to control described power management chip and provide pre-set current value and preset voltage value; And
Feedback circuit, be connected between described power management chip, described processor and described battery, current ratio is carried out respectively with the charging current of described battery and charging voltage comparatively and voltage compare to receive the described pre-set current value of described processor and described preset voltage value, and provide feed back signal to described power management chip according to comparative result, thus regulate the horsepower output of described power management chip;
Wherein, described power management chip charging voltage that is larger than described pre-set current value in the charging current of described battery or described battery reduces described horsepower output time larger than described preset voltage value, increases described horsepower output when described charging current is less than described pre-set current value or described charging voltage is less than described preset voltage value.
2. switch type charging circuit as claimed in claim 1, it is characterized in that, described switch type charging circuit also comprises switching circuit, and described switching circuit is electrically connected between described power management chip and described processor to control the work of described power management chip.
3. switch type charging circuit as claimed in claim 2, it is characterized in that, described switching circuit comprises switch element, first conduction terminal of described switch element is electrically connected the Enable Pin of described power management chip, second conduction terminal ground connection of described switch element, whether the controlled end of described switch element is electrically connected described processor and works to control power management chip with the control signal receiving described processor.
4. switch type charging circuit as claimed in claim 3, it is characterized in that, described switch element is a field effect transistor, and the drain electrode of described field effect transistor, source electrode and grid are respectively as described first conduction terminal of described switch element, described second conduction terminal and described controlled end.
5. switch type charging circuit as claimed in claim 3, it is characterized in that, described switching circuit also comprises the first resistance, and described first resistance is electrically connected between described first conduction terminal and the input of described power management chip.
6. switch type charging circuit as claimed in claim 1, it is characterized in that, described feedback circuit comprises:
First error amplifier, first input end and the second input are connected to the two ends of sample resistance to obtain described charging current and to export amplified current;
First digital to analog converter, input is electrically connected described processor to receive described pre-set current value, and described pre-set current value is converted to current reference value;
Second error amplifier, first input end is electrically connected the output of described first error amplifier, second input is electrically connected the output of described first digital to analog converter, and described second error amplifier is used for described amplified current and described current reference value to compare and output current comparative result;
Second digital to analog converter, input is electrically connected described processor to receive described preset voltage value, and described preset voltage value is converted to voltage reference value;
3rd error amplifier, first input end is electrically connected the input of described battery to obtain described charging voltage, second input is electrically connected the output of described second digital to analog converter, and described first error amplifier is used for described charging voltage and described voltage reference value to compare and output voltage comparative result; And
Blender, the input of described blender is connected to the output of described second error amplifier and the output of described 3rd error amplifier to receive described electric current comparative result and described voltage compare result, the output of described blender is electrically connected the feedback end of described power management chip, and described blender is for exporting described feedback signal to described power management chip.
7. switch type charging circuit as claimed in claim 6, it is characterized in that, described feedback circuit also comprises feedback resistance, and the first end of described feedback resistance is connected with the output of described blender, and the second end of described feedback resistance connects the feedback end of described power management chip.
8. switch type charging circuit as claimed in claim 7, it is characterized in that, described feedback circuit also comprises the second resistance, the 3rd resistance and electric capacity, described electric capacity is connected with described second resistor coupled in parallel with after described 3rd resistant series, and then connects described feedback resistance second end to adjust the voltage of described feedback resistance.
9. switch type charging circuit as claimed in claim 1; it is characterized in that; described switch type charging circuit also comprises the first field effect transistor; first conduction terminal of described first field effect transistor is electrically connected described power management chip output; second conduction terminal of described first field effect transistor connects the input of described battery; the controlled end of described first field effect transistor connects described processor, and described first field effect transistor is for adjusting described charging current to protect described battery.
10. switch type charging circuit as claimed in claim 9, it is characterized in that, described first field effect transistor is high-power field effect pipe, and the drain electrode of described high-power field effect pipe, source electrode and grid are respectively as described first conduction terminal of described first field effect transistor, described second conduction terminal and described controlled end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410432012.1A CN105375541A (en) | 2014-08-28 | 2014-08-28 | Switching type charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410432012.1A CN105375541A (en) | 2014-08-28 | 2014-08-28 | Switching type charging circuit |
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| Publication Number | Publication Date |
|---|---|
| CN105375541A true CN105375541A (en) | 2016-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410432012.1A Pending CN105375541A (en) | 2014-08-28 | 2014-08-28 | Switching type charging circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN105375541A (en) |
Cited By (3)
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| CN107919688A (en) * | 2016-10-09 | 2018-04-17 | 苏州宝时得电动工具有限公司 | Charger and charging system |
| CN112994167A (en) * | 2021-03-19 | 2021-06-18 | 维沃移动通信有限公司 | Charging device, electronic apparatus, charging control method, and charging control device |
| CN113541246A (en) * | 2021-06-30 | 2021-10-22 | 苏州瀚川智能科技股份有限公司 | High-precision formation power supply circuit |
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Effective date of registration: 20180226 Address after: 201613 Shanghai city south of Songjiang Export Processing Zone Road No. 1925 Applicant after: Ambit Microsystems (Shanghai) Co., Ltd. Address before: 201613 Shanghai City, Songjiang District Songjiang Export Processing Zone South Road No. 1925 Applicant before: Ambit Microsystems (Shanghai) Co., Ltd. Applicant before: Hon Hai Precision Industry Co., Ltd. |
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