CN105354168B - Realize the computer circuits structure that solar cell for supplying power automatically switches - Google Patents
Realize the computer circuits structure that solar cell for supplying power automatically switches Download PDFInfo
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- CN105354168B CN105354168B CN201410419868.5A CN201410419868A CN105354168B CN 105354168 B CN105354168 B CN 105354168B CN 201410419868 A CN201410419868 A CN 201410419868A CN 105354168 B CN105354168 B CN 105354168B
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Abstract
The present invention relates to a kind of computer circuits structures realized solar cell for supplying power and automatically switched, and including voltage comparator, the first input end of the voltage comparator is connected with the solar cell of calculator, and the second input terminal is connected with the dry cell of calculator；Power switch, the comparison result to be exported according to voltage comparator select to be powered for calculator by solar cell or dry cell；Voltage-stablizer, the voltage device are connected between the power input of the load of the power supply output end and calculator of power switch.Using the computer circuits structure of this kind of structure realized solar cell for supplying power and automatically switched, using voltage comparator, power switch and voltage-stablizer, these three function modules are combined, can play voltage when being inputted to dual power supply compare, voltage source selection and voltage stabilizing function, a metastable operating voltage can be provided by voltage-stablizer to circuit, it can preferably ensure that circuit stability works, there is wider application range.
Description
Technical field
The present invention relates to power supply technique fields more particularly to solar energy to switch for electrical domain, in particular to one kind with battery
Realize the computer circuits structure that solar cell for supplying power automatically switches.
Background technology
In the computer circuits of the prior art, Double-battery powered is carried out using solar powered or battery, is to need to lead to
The external diode of oversampling circuit carries out judging selection.It is such the disadvantage is that, need periphery connect diode carry out battery selection, outside
Contour road is more complex, and when final assembly can increase labor hour cost and component expense.
By in the prior art for the specific peripheral applications line map of certain computer circuits CS6027B products of volume production into
Row background technology introduction, as shown in Fig. 1~2：
Overstriking frame portion is divided into this product double cell (1.5V dry cells and solar cell SB) application circuit figure in Fig. 1,
This product VSB pins and VOP pin inner portions line assumption diagrams are as shown in Figure 3.
In Fig. 3~4, VSB is the sun input pin of chip, and VOP is solar energy option pin, and VGG draws for power input
Foot.R1 resistance and this 3 diodes of D2, D3, D4 are chip internal circuits, carry out pressure limiting to the voltage of solar energy input, generally
Solar energy input voltage can be limited within 1.8V voltages.D0 and D1 is circuit peripheral germanium tube diode, for being isolated
1.5V dry cells and SB batteries (solar cell), prevent the generation of mutual charging phenomenon.
It is designed using Double-battery powered in former calculator, needs 3 pins (VSB, VOP, VGG) and peripheral 2 germanium tubes
(D0 and D1).
In above-mentioned design, when VOP voltages are higher than dry cell voltage, the conducting of D1 germanium tubes, D0 germanium tubes cut-off, using solar energy
Battery powers to circuit；When VOP voltages are less than dry cell voltage, the conducting of D0 germanium tubes, D1 germanium tubes cut-off, using dry cell to electricity
Road powers.
The shortcomings that prior art：
(1) prior art periphery circuit needs at least two germanium diode to carry out between battery powered selection and battery
Isolation for selecting the 2 of solar cell for supplying power or dry cell power supply germanium tubes to be integrated in chip interior, will allow circuit can be with
It is automatic to carry out solar cell for supplying power switching.The manufacturing process of germanium tube and the manufacturing process of CMOS are different, if will be
Realize low unlatching diode in CMOS technology, complex process and difficulty is big.
(2) when final assembly, when peripheral germanium diode needs Welder, the obtained circuit voltage of original application can be with
Supply voltage and change, and germanium diode have certain droop loss.
Invention content
The purpose of the present invention is overcoming the above-mentioned prior art, simplified object-line can be realized by providing one kind
Road, when saving germanium diode and its Welder, power supply circuit construction is stable, prevents solar cell charge when not loading tired
The case where accumulating effect and generating voltage virtual height, the meter realized solar cell for supplying power and automatically switched with broader applications range
Calculate device circuit structure.
To achieve the goals above, the computer circuits structure tool realized solar cell for supplying power and automatically switched of the invention
There is following composition：
The computer circuits structure that the realization solar cell for supplying power automatically switches, is mainly characterized by, the circuit
Structure includes：
Voltage comparator, the first input end of the voltage comparator are connected with the solar cell of the calculator,
Second input terminal of the voltage comparator is connected with the dry cell of the calculator；
Power switch, to be selected by the solar cell according to the comparison result of the voltage comparator output
Or the dry cell is that the calculator is powered.
Voltage-stablizer, the voltage-stablizer are connected to the load of the power supply output end and the calculator of the power switch
Between power input.
Preferably, there is the power switch bias voltage output, the bias voltage of the power switch to export
End is connected with the bias voltage input of the voltage comparator.
More preferably, the power switch includes：
Switch control element, to according to the comparison result of the voltage comparator selection output dry cell
The voltage of voltage or the solar cell to the calculator power input；
Self-start circuit, the input terminal of the self-start circuit are connected with the output end of the switch control element；
Biasing circuit, it is described to generate two-way bias voltage under the startup voltage of the self-start circuit generation
Biasing circuit output the first via bias voltage input voltage comparator bias voltage input, the biasing of the second tunnel
The bias voltage input of the load of calculator described in control source.
Further, the switch control element includes：
First PMOS tube, the grid of first PMOS tube are connected with the output end of the voltage comparator, this first
The drain electrode of PMOS tube is connected with the dry cell, and the source electrode of first PMOS tube is defeated with the self-start circuit respectively
Enter end with the input terminal of the phase inverter to be connected；
Phase inverter, the output end of the phase inverter are connected with the first power input of the load of the calculator；
Second PMOS tube, the grid that the output end of the voltage comparator passes through the phase inverter and second PMOS tube
Pole is connected, and the drain electrode of second PMOS tube is electric with the second of the load of the solar cell and the calculator respectively
Source input terminal is connected, the source electrode of second PMOS tube respectively with the input terminal of the self-start circuit and the phase inverter
Input terminal be connected.
Still further, the switch control element further includes the first parasitic diode and the second parasitic diode, institute
The first parasitic diode stated is connected between the drain electrode and substrate of first PMOS tube, second parasitic diode
It is connected between the drain electrode and substrate of second PMOS tube.
The computer circuits structure realized solar cell for supplying power and automatically switched in the invention is used, have has as follows
Beneficial effect：
(1) it eliminates periphery 2 and is used as the germanium tube that voltage source judges selection, save peripheral component, save two pole of germanium
Pipe and its when Welder；
(2) simplify periphery circuit, the wiring of peripheral pcb board can be simplified, reduce peripheral component welding sequence, improve at
Product production efficiency；
(3) using voltage comparator, power switch and voltage-stablizer, these three function modules are combined, Ke Yiqi
To (solar energy or battery powered) when being inputted to dual power supply voltage compare, voltage source selection and voltage stabilizing function, pass through voltage stabilizing
Device can provide a metastable operating voltage to circuit, can preferably ensure that circuit stability works, have more extensively
Application range.
Description of the drawings
Fig. 1 is the overall structure diagram of calculator in the prior art.
Fig. 2 is the overall structure block diagram of calculator in the prior art.
Fig. 3 is the structural schematic diagram of the power switching part of calculator in the prior art.
Fig. 4 is that the power switching part of calculator is schemed with the supply line that periphery circuit figure collectively forms in the prior art.
Fig. 5 is the structural schematic diagram of the computer circuits structure for realizing solar cell for supplying power automatic switchover of the present invention.
Fig. 6 is the overall structure diagram of the calculator of the present invention.
Fig. 7 is the overall structure block diagram of the calculator of the present invention.
Fig. 8 is the internal circuit configuration schematic diagram of the power switch of the present invention.
Fig. 9 is the internal circuit configuration schematic diagram of the switch control element of the power switch of the present invention.
Specific implementation mode
In order to more clearly describe the technology contents of the present invention, carried out with reference to specific embodiment further
Description.
The present invention is by voltage comparator common in CMOS technology, LDO (voltage-stablizer), POWERSWITCH (power switch)
Etc. function modules combine, realize solar cell or dry cell power supply automatic switching function.
It is illustrated in figure 5 the structure diagram that the present invention automatically switches for realizing solar cell for supplying power.Principle：
CMP (comparator) is compared VBAT (battery) voltages and VSB (solar energy) voltage, thus judges solar energy
Which is high for battery and dry cell voltage；Such as judge that solar cell is higher than dry cell, then CMP exports a switch-over control signal
SEL_VSB gives POWERSWITCH units.
After POWERSWITCH (power switch) unit receives effective SEL_VSB signals, solar cell will be used to make
For the supply input of circuit.
After the output of POWERSWITCH is using LDO (voltage-stablizer) unit voltage stabilizing, vdd voltage is generated；VDD pins periphery
Shunt capacitance is connect, is powered to circuit.
Periphery circuit figure after applying the present invention is as shown in figs. 6-7.
If above-mentioned CS6027B computer circuits are using the present invention, the application drawing of substantial periphery power supply power supply part is revised as
As shown in Figure 5.
In above-mentioned line map, bold box is double cell (solar cell and dry cell) application circuit after applying the present invention
Figure.For compared with the existing technology, periphery circuit structure is simplified, eliminates 2 for judging and being isolated double cell voltage
Germanium diode a, it is only necessary to shunt capacitance.
The present invention has following two technological difficulties：
1, when circuit initial power-on, how POWERSWITCH generates VDDSW voltages supply comparator.I.e. circuit will consider
These three situations：(1) while there are solar cell for supplying power and the second battery powered；(2) there was only solar cell for supplying power；(3) only
There is the second battery powered.
If 2, solar cell does not load, solar voltage might have virtual height phenomenon by cumulative effect, even if
In the case of dark, it is also possible to be higher than the second cell voltage.If POWERSWITCH is switched to solar cell at this time
Power supply, solar cell have load suddenly, if voltage declines quickly, when being less than the second cell voltage, are exported by comparator
Control, POWERSWITCH can be switched to the second battery powered again.During this is toggled, VDDSW may result in
Spread of voltage and make circuit job insecurity.
POWERSWITCH power switches 1 in Fig. 5, the CMP_RESULT exported according to CMP voltage comparators 2 is as a result, right
The solar array voltage VSB of input and the second cell voltage VBAT carry out input selection control, generate VDDSW voltages and BIAS
Voltage.Wherein it is steady to be used as POWERSWITCH power switches 1 according to the present invention, CMP voltage comparators 2, LDO for VDDSW voltages
The working power of depressor 3, and BIAS (biasing) voltage be CMP voltage comparators 2 work when bias voltage.VDDSW voltages pass through
After crossing the adjustment of 3 voltage of LDO voltage stabilizer, the operating voltage VDD of computer circuits is generated.
As shown in Fig. 8~9, parasitism two of the drain region to substrate of PMOS device in CMOS technology is cleverly utilized in the present invention
Pole pipe and PMOS device do not have transmission high level the characteristic that threshold value is lost, such good to build switch control element
Place has 2：(1) when circuit initial power-on, even if CMP does not generate correct comparison signal, two pole of parasitism of PMOS tube is utilized
Pipe, VDDSW can also obtain a startup voltage；Using this startup voltage, POWERSWITCH modules generate CMP comparator works
The bias voltage BIAS of work；(2) after having startup voltage and bias voltage, CMP is compared VBAT voltages and VSB voltages,
Correct comparison signal is obtained, the PMOS tube controlled in switching circuit chooses that high voltage.Since PMOS tube is for transmission
High level does not have threshold value loss, and it is ceiling voltage (such as VBAT to eventually pass through the VDDSW generated after POWERSWITCH modules select>
VSB is then VBAT voltages；Such as VBAT<VSB is then VSB voltages).
In Fig. 8, power switching module includes the switch control element of PMOS tube 4, PMOS tube 5, the composition of INV phase inverters 6, with
And self-start circuit 7, biasing circuit 8 and equivalent load 9.
Due to the diode of one forward conduction of drain terminal and substrate parasitics of PMOS tube, in circuit start, switch control
Components Department processed point is equivalent to circuit structure shown in Fig. 9.
Diode 10 and the diode 11 respectively parasitic diode of PMOS tube 4, PMOS tube 5 in Fig. 9.There are this 2
Parasitic diode, no matter the value of CMP_RESULT and CMP_RESULT_N at this time, VBAT and VSB are forward conduction to VDDSW
, but VBAT and VSB can pass through this 2 parasitic diode isolation again each other.As long as VBAT has electricity or VSB to have electricity,
VDDSW can obtain startup voltage.
Self-start circuit generates a Start-Up signal after VDDSW obtains startup voltage, starts biasing circuit and generates
2 groups of bias voltages, one of bias voltage BIAS are supplied to CMP voltage comparators 2, another bias voltage CMP_TO_
LOAD is supplied to equivalent load 9.
CMP voltage comparators 2 are obtained from VDDSW starts voltage and after biasing circuit obtains BIAS voltages, to input
VBAT voltages and VSB voltages be compared, generate a CMP_RESULT signal give POWERSWITCH power switches 1,
Wherein 1 conducting in PMOS tube 4 or PMOS tube 5 this 2 switch elements in POWERSWITCH power switches 1,
That battery that POWERSWITCH power switches 1 select VBAT, VSB voltage high is powered to VDDSW.
In example of the present invention, when VBAT voltages are higher than VSB voltages, the CMP_RESULT=of the output of CMP voltage comparators 2
0, control PMOS tube 4 is connected, and VBAT is used as VDDSW power supplys.When VBAT voltages are less than VSB voltages, CMP voltage comparators 2 are defeated
The CMP_RESULT=1 gone out, inversion signal CMP_RESULT_N=0, control PMOS tube 5 are connected, and VSB is used as VDDSW power supplys.
In example of the present invention, when VBAT is used as VDDSW power supplys, CMP_RESULT_N=1 opens equivalent load work, makes
VSB has equivalent current consumption, be unlikely to by solar cell the charge accumulation effects when not loading and generate voltage virtual height
The case where.When VSB voltages are higher than VBAT voltages, CMP_RESULT_N=0 forbids equivalent load to work.
The computer circuits structure realized solar cell for supplying power and automatically switched in the invention is used, have has as follows
Beneficial effect：
(1) it eliminates periphery 2 and is used as the germanium tube that voltage source judges selection, save peripheral component, save two pole of germanium
Pipe and its when Welder；
(2) simplify periphery circuit, the wiring of peripheral pcb board can be simplified, reduce peripheral component welding sequence, improve at
Product production efficiency；
(3) using voltage comparator, power switch and voltage-stablizer, these three function modules are combined, Ke Yiqi
To (solar energy or battery powered) when being inputted to dual power supply voltage compare, voltage source selection and voltage stabilizing function, pass through voltage stabilizing
Device can provide a metastable operating voltage to circuit, can preferably ensure that circuit stability works, have more extensively
Application range.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that can still make
Various modifications and alterations are without departing from the spirit and scope of the invention.Therefore, the description and the appended drawings should be considered as illustrative
And not restrictive.
Claims (4)
1. a kind of computer circuits structure realized solar cell for supplying power and automatically switched, which is characterized in that the circuit knot
Structure includes：
Voltage comparator, the first input end of the voltage comparator are connected with the solar cell of the calculator, the electricity
Second input terminal of pressure comparator is connected with the dry cell of the calculator；
Power switch, to be selected by the solar cell or institute according to the comparison result of the voltage comparator output
The dry cell stated is that the calculator is powered；
Voltage-stablizer, the voltage-stablizer are connected to the power supply of the load of the power supply output end and the calculator of the power switch
Between input terminal；
The power switch includes switch control element and self-start circuit, which includes：
The grid of first PMOS tube, first PMOS tube is connected with the output end of the voltage comparator, and described first
The drain electrode of PMOS tube is connected with the dry cell, the source electrode of first PMOS tube respectively with the self-start circuit
Input terminal is connected with the input terminal of phase inverter；
The phase inverter, the output end of the phase inverter are connected with the first power input of the load of the calculator
It connects；
Second PMOS tube, the grid that the output end of the voltage comparator passes through the phase inverter and second PMOS tube
It is connected, the drain electrode of second PMOS tube is electric with the second of the load of the solar cell and the calculator respectively
Source input terminal is connected, the source electrode of second PMOS tube respectively with the input terminal of the self-start circuit and the reverse phase
The input terminal of device is connected.
2. the computer circuits structure according to claim 1 realized solar cell for supplying power and automatically switched, feature exist
In the power switch has bias voltage output, the bias voltage output of the power switch and the electricity
The bias voltage input of pressure comparator is connected.
3. the computer circuits structure according to claim 2 realized solar cell for supplying power and automatically switched, feature exist
In the power switch further includes biasing circuit, to generate two under the startup voltage of the self-start circuit generation
The bias voltage of road bias voltage, the first via bias voltage input voltage comparator of biasing circuit output is defeated
Enter end, the bias voltage input of the load of the second road bias voltage input calculator.
4. the computer circuits structure according to claim 1 realized solar cell for supplying power and automatically switched, feature exist
In the switch control element further includes the first parasitic diode and the second parasitic diode, the described first parasitic two poles
Pipe is connected between the drain electrode and substrate of first PMOS tube, and second parasitic diode is connected to described second
Between the drain electrode and substrate of PMOS tube.
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| CN201410419868.5A CN105354168B (en) | 2014-08-22 | 2014-08-22 | Realize the computer circuits structure that solar cell for supplying power automatically switches |
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| CN201410419868.5A CN105354168B (en) | 2014-08-22 | 2014-08-22 | Realize the computer circuits structure that solar cell for supplying power automatically switches |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105975429A (en) * | 2016-05-18 | 2016-09-28 | 哈尔滨理工大学 | Portable multifunctional calculator |
| CN117220399B (en) * | 2023-09-13 | 2024-03-12 | 北京昆仑海岸科技股份有限公司 | Lithium battery, solar power supply conversion circuit and conversion control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033565A (en) * | 2009-09-24 | 2011-04-27 | 上海华虹Nec电子有限公司 | Voltage reference circuit |
| CN102591391A (en) * | 2011-01-10 | 2012-07-18 | 英飞凌科技股份有限公司 | Voltage regulator |
| CN202363968U (en) * | 2011-12-14 | 2012-08-01 | 陕西千山航空电子有限责任公司 | Dual-power input selection and power reverse connection prevention circuit |
| CN103944255A (en) * | 2014-04-29 | 2014-07-23 | 北京凯华网联新能源技术有限公司 | Auxiliary power supply device used for new energy mobile base station and power supply method of auxiliary power supply device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101260307B1 (en) * | 2006-09-04 | 2013-05-03 | 삼성전자주식회사 | Power supply apparatus |
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2014
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033565A (en) * | 2009-09-24 | 2011-04-27 | 上海华虹Nec电子有限公司 | Voltage reference circuit |
| CN102591391A (en) * | 2011-01-10 | 2012-07-18 | 英飞凌科技股份有限公司 | Voltage regulator |
| CN202363968U (en) * | 2011-12-14 | 2012-08-01 | 陕西千山航空电子有限责任公司 | Dual-power input selection and power reverse connection prevention circuit |
| CN103944255A (en) * | 2014-04-29 | 2014-07-23 | 北京凯华网联新能源技术有限公司 | Auxiliary power supply device used for new energy mobile base station and power supply method of auxiliary power supply device |
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