CN105354168A - Calculator circuit structure for realizing solar cell power supply automatic switching - Google Patents
Calculator circuit structure for realizing solar cell power supply automatic switching Download PDFInfo
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- CN105354168A CN105354168A CN201410419868.5A CN201410419868A CN105354168A CN 105354168 A CN105354168 A CN 105354168A CN 201410419868 A CN201410419868 A CN 201410419868A CN 105354168 A CN105354168 A CN 105354168A
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Abstract
The invention relates to a calculator circuit structure for realizing solar cell power supply automatic switching. The calculator circuit structure comprises: a voltage comparator, wherein a first input end of the voltage comparator is connected with a solar cell of a calculator, and a second input end is connected with a dry cell of the calculator; a power switch, used for selecting the solar cell or the dry cell to supply power to the calculator according to a comparison result output by the voltage comparator; and a voltage stabilizer, connected between the power supply output end of the power switch and the power input end of a load of the calculator. With the adoption of the calculator circuit structure for realizing solar cell power supply automatic switching, three functional modules of the voltage comparator, the power switch and the voltage stabilizer are combined together, so that the functions of voltage comparison, voltage source selection and voltage stabilization during dual-power input can be achieved; and a relatively stable working voltage can be provided for a circuit through the voltage stabilizer, so that the circuit can be better ensured to work stably. Therefore, the calculator circuit structure has a wider application range.
Description
Technical field
The present invention relates to power supply technique field, particularly relate to sun power and battery and switch for electrical domain, specifically refer to a kind of computer circuits structure realizing solar cell for supplying power and automatically switch.
Background technology
In the computer circuits of prior art, adopt solar powered or battery to carry out Double-battery powered, need to carry out judgement by the external diode of circuit and select.Such shortcoming is, need periphery to connect diode and carry out battery selection, periphery circuit is more complicated, can increase labor hour cost and components and parts expense during final assembly.
For in prior art the concrete peripheral applications wiring diagram of certain computer circuits CS6027B product of volume production carry out background technology introduction, as shown in Fig. 1 ~ 2:
In Fig. 1, overstriking frame part is this product double cell (1.5V dry cell and solar cell SB) application circuit figure, and this product VSB pin and VOP pin inner portions line assumption diagram are as shown in Figure 3.
In Fig. 3 ~ 4, VSB is the sun input pin of chip, and VOP is sun power option pin, and VGG is power input pin.R1 resistance and these 3 diodes of D2, D3, D4 are chip internal circuits, carry out pressure limiting, generally sun power input voltage can be limited within 1.8V voltage the voltage of sun power input.D0 and D1 is circuit peripheral germanium tube diode, for isolating 1.5V dry cell and SB battery (solar cell), prevents the generation of mutual charging phenomenon.
Adopt Double-battery powered to design in former counter, need 3 pins (VSB, VOP, VGG) and peripheral 2 germanium tubes (D0 and D1).
In above-mentioned design, when VOP voltage is higher than dry cell voltage, the conducting of D1 germanium tube, D0 germanium tube ends, and adopts solar cell to power to circuit; When VOP voltage is lower than dry cell voltage, the conducting of D0 germanium tube, D1 germanium tube ends, and adopts dry cell to power to circuit.
The shortcoming of prior art:
(1) prior art periphery circuit needs at least 2 germanium diodes carry out the isolation between powered battery selection and battery, selecting solar cell for supplying power by being used for or 2 germanium tubes of dry cell power supply are integrated in chip internal, allowing circuit automatically can carry out solar cell for supplying power switching.The manufacturing process of germanium tube and the manufacturing process of CMOS are different, if low unlatching diode will be realized in CMOS technology, and complex process and difficulty is large.
(2), during final assembly, when peripheral germanium diode needs Welder, the circuit voltage that former application obtains can change along with supply voltage, and germanium diode has certain droop loss.
Summary of the invention
The object of the invention is the shortcoming overcoming above-mentioned prior art, provide and a kind ofly can realize simplifying periphery circuit, when saving germanium diode and Welder thereof, power supply circuit construction stablizes, prevent solar cell when there is no load charge accumulation effects and produce voltage virtual height situation, there is broader applications scope realize the computer circuits structure that solar cell for supplying power automatically switches.
To achieve these goals, the computer circuits structure realizing solar cell for supplying power automatic switchover of the present invention has following formation:
This realizes the computer circuits structure that solar cell for supplying power automatically switches, and its principal feature is, described circuit structure comprises:
Voltage comparator, the first input end of this voltage comparator is connected with the solar cell of described counter, and the second input end of this voltage comparator is connected with the dry cell of described counter;
Power switch, the comparative result in order to export according to described voltage comparator is selected by described solar cell or described dry cell to be that described counter is powered.
Voltage stabilizer, this voltage stabilizer is connected between the power input of the power supply output terminal of described power switch and the load of described counter.
Preferably, described power switch has bias voltage output, and the bias voltage output of described power switch is connected with the bias voltage input of described voltage comparator.
More preferably, described power switch comprises:
Switch control element, in order to the voltage of dry cell described in selecting according to the comparative result of described voltage comparator to export or the voltage of described solar cell to the power input of described counter;
Self-start circuit, the input end of this self-start circuit is connected with the output terminal of described switch control element;
Biasing circuit, two-way bias voltage is generated in order under the trigger voltage that generates at described self-start circuit, the bias voltage input of the voltage comparator described in the input of first via bias voltage that described biasing circuit exports, the bias voltage input of the load of the counter described in the second road bias voltage input.
Further, described switch control element comprises:
First PMOS, the grid of this first PMOS is connected with the output terminal of described voltage comparator, the drain electrode of this first PMOS is connected with described dry cell, and the source electrode of this first PMOS is connected with the input end of described phase inverter with the input end of described self-start circuit respectively;
Phase inverter, the output terminal of this phase inverter is connected with the first power input of the load of described counter;
Second PMOS, the output terminal of described voltage comparator is connected by the grid of described phase inverter with this second PMOS, the drain electrode of this second PMOS is connected with the second source input end of the load of described counter with described solar cell respectively, and the source electrode of this second PMOS is connected with the input end of described phase inverter with the input end of described self-start circuit respectively.
Again further, described switch control element also comprises the first parasitic diode and the second parasitic diode, between the drain electrode that the first described parasitic diode is connected to the first described PMOS and substrate, between the drain electrode that the second described parasitic diode is connected to the second described PMOS and substrate.
Have employed the computer circuits structure realizing solar cell for supplying power automatic switchover in this invention, there is following beneficial effect:
(1) eliminate peripheral 2 germanium tubes being used as voltage source and judging to select, save peripheral component, when saving germanium diode and Welder thereof;
(2) simplify periphery circuit, the wiring of peripheral pcb board can be simplified, reduce peripheral component welding sequence, improve finished product production efficiency;
(3) these three functional modules of voltage comparator, power switch and voltage stabilizer are utilized to combine, the voltage compare of (sun power or powered battery) when dual power supply is inputted can be played, voltage source is selected and voltage stabilizing function, a metastable operating voltage can be provided to circuit by voltage stabilizer, can better ensure circuit stability work, there is range of application widely.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of counter in prior art.
Fig. 2 is the one-piece construction block diagram of counter in prior art.
Fig. 3 is the structural representation of the power switching part of counter in prior art.
Fig. 4 is that the supply line that the power switching part of counter in prior art and periphery circuit figure are formed jointly schemes.
Fig. 5 is the structural representation realizing the computer circuits structure that solar cell for supplying power automatically switches of the present invention.
Fig. 6 is the one-piece construction schematic diagram of counter of the present invention.
Fig. 7 is the one-piece construction block diagram of counter of the present invention.
Fig. 8 is the internal circuit configuration schematic diagram of power switch of the present invention.
Fig. 9 is the internal circuit configuration schematic diagram of the switch control element of power switch of the present invention.
Embodiment
In order to more clearly describe technology contents of the present invention, conduct further description below in conjunction with specific embodiment.
The functional modules such as voltage comparator common in CMOS technology, LDO (voltage stabilizer), POWERSWITCH (power switch) are combined by the present invention, realize solar cell or dry cell power supply automatic switching function.
Be illustrated in figure 5 the structured flowchart that the present invention is automatically switched for realizing solar cell for supplying power.Principle:
CMP (comparer) compares VBAT (battery) voltage and VSB (sun power) voltage, judges solar cell and which height of dry cell voltage thus; As judged, solar cell is higher than dry cell, then CMP exports a switch-over control signal SEL_VSB to POWERSWITCH unit.
After POWERSWITCH (power switch) unit receives effective SEL_VSB signal, the power supply adopting solar cell as circuit is inputted.
The output of POWERSWITCH, again after the voltage stabilizing of LDO (voltage stabilizer) unit, produces vdd voltage; VDD pin periphery connects shunt capacitance, powers to circuit.
Adopt the periphery circuit figure after the present invention as shown in figs. 6-7.
As above-mentioned CS6027B computer circuits adopts the present invention, the application drawing of substantial periphery Power supply part is revised as shown in Figure 5.
In above-mentioned wiring diagram, bold box is double cell (solar cell and dry cell) the application circuit figure after adopting the present invention.Relative to prior art, simplify periphery circuit structure, eliminate 2 for judging and isolate the germanium diode of double cell voltage, only need a shunt capacitance.
The present invention has following two technological difficulties:
1, when circuit initially powers on, how POWERSWITCH produces VDDSW voltage supply comparer.Namely circuit will consider this three kinds of situations: (1) has solar cell for supplying power and the second powered battery simultaneously; (2) solar cell for supplying power is only had; (3) the second powered battery is only had.
If 2 solar cells do not have load, solar voltage may have virtual height phenomenon, even if when dark, also likely higher than the second cell voltage by cumulative effect.If now POWERSWITCH switches to solar cell for supplying power, solar cell has had suddenly load, if voltage drop is very fast, during lower than the second cell voltage, by the control that comparer exports, POWERSWITCH can switch to the second powered battery again.In this back and forth handoff procedure, VDDSW spread of voltage may be caused and make circuit working unstable.
POWERSWITCH power switch 1 in Fig. 5, according to the CMP_RESULT result that CMP voltage comparator 2 exports, carries out input selection control to the solar array voltage VSB inputted and the second cell voltage VBAT, produces VDDSW voltage and BIAS voltage.Wherein VDDSW voltage is used as the working power of POWERSWITCH power switch 1 involved in the present invention, CMP voltage comparator 2, LDO voltage stabilizer 3, and the bias voltage of BIAS (being biased) voltage when to be CMP voltage comparator 2 work.VDDSW voltage, after LDO voltage stabilizer 3 Voltage Cortrol, produces the operating voltage VDD of computer circuits.
As shown in Fig. 8 ~ 9, the present invention make use of the parasitic diode of drain region to substrate of PMOS device in CMOS technology cleverly, and the characteristic that PMOS device does not have threshold value to lose for transmission high level, build switch control element, such benefit has 2: when (1) circuit initially powers on, CMP is even without producing correct comparison signal, and utilize the parasitic diode of PMOS, VDDSW also can obtain a trigger voltage; Utilize this trigger voltage, POWERSWITCH module produces the bias voltage BIAS of CMP comparer work; (2) after having had trigger voltage and bias voltage, CMP compares VBAT voltage and VSB voltage, obtains correct comparison signal, and the PMOS in gauge tap circuit chooses that high voltage.Because PMOS does not have threshold value to lose for transmission high level, the VDDSW produced after eventually passing through POWERSWITCH model choice is ceiling voltage (as VBAT>VSB, is then VBAT voltage; As VBAT<VSB, be then VSB voltage).
In Fig. 8, power switching module comprises the switch control element of PMOS 4, PMOS 5, INV phase inverter 6 formation, and self-start circuit 7, biasing circuit 8 and equivalent load 9.
Due to the drain terminal of PMOS and the diode of a substrate parasitics forward conduction, when circuit start, its switch control element part is equivalent to the circuit structure shown in Fig. 9.
Diode 10 in Fig. 9 and diode 11 are respectively the diode of PMOS 4, PMOS 5 parasitism.No matter now had this 2 parasitic diodes, value of CMP_RESULT and CMP_RESULT_N, VBAT and VSB is forward conduction to VDDSW, but VBAT and VSB each other again can by these 2 parasitic diode isolation.As long as VBAT has electricity or VSB to have electricity, VDDSW can obtain trigger voltage.
After self-start circuit obtains trigger voltage from VDDSW, produce a Start-Up signal, start biasing circuit and produce 2 groups of bias voltages, one of them bias voltage BIAS is supplied to CMP voltage comparator 2, and another one bias voltage CMP_TO_LOAD is supplied to equivalent load 9.
CMP voltage comparator 2 obtains trigger voltage and after obtaining BIAS voltage from biasing circuit from VDDSW, the VBAT voltage inputted and VSB voltage are compared, produce a CMP_RESULT signal and give POWERSWITCH power switch 1, wherein 1 conducting in PMOS 4 in POWERSWITCH power switch 1 or these 2 on-off elements of PMOS 5, that battery that POWERSWITCH power switch 1 selects VBAT, VSB voltage high is powered to VDDSW.
In example of the present invention, when VBAT voltage is higher than VSB voltage, the CMP_RESULT=0 that CMP voltage comparator 2 exports, control PMOS 4 conducting, VBAT is used as VDDSW power supply.When VBAT voltage is lower than VSB voltage, the CMP_RESULT=1 that CMP voltage comparator 2 exports, its inversion signal CMP_RESULT_N=0, control PMOS 5 conducting, and VSB is used as VDDSW power supply.
In example of the present invention, when VBAT is used as VDDSW power supply, CMP_RESULT_N=1 opens equivalent load work, makes VSB have equivalent current consumption, is unlikely to by solar cell charge accumulation effects and produce the situation of voltage virtual height when not having load.When VSB voltage is higher than VBAT voltage, CMP_RESULT_N=0 forbids equivalent load work.
Have employed the computer circuits structure realizing solar cell for supplying power automatic switchover in this invention, there is following beneficial effect:
(1) eliminate peripheral 2 germanium tubes being used as voltage source and judging to select, save peripheral component, when saving germanium diode and Welder thereof;
(2) simplify periphery circuit, the wiring of peripheral pcb board can be simplified, reduce peripheral component welding sequence, improve finished product production efficiency;
(3) these three functional modules of voltage comparator, power switch and voltage stabilizer are utilized to combine, the voltage compare of (sun power or powered battery) when dual power supply is inputted can be played, voltage source is selected and voltage stabilizing function, a metastable operating voltage can be provided to circuit by voltage stabilizer, can better ensure circuit stability work, there is range of application widely.
In this description, the present invention is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, instructions and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (5)
1. realize the computer circuits structure that solar cell for supplying power automatically switches, it is characterized in that, described circuit structure comprises:
Voltage comparator, the first input end of this voltage comparator is connected with the solar cell of described counter, and the second input end of this voltage comparator is connected with the dry cell of described counter;
Power switch, the comparative result in order to export according to described voltage comparator is selected by described solar cell or described dry cell to be that described counter is powered.
Voltage stabilizer, this voltage stabilizer is connected between the power input of the power supply output terminal of described power switch and the load of described counter.
2. the computer circuits structure realizing solar cell for supplying power and automatically switch according to claim 1, it is characterized in that, described power switch has bias voltage output, and the bias voltage output of described power switch is connected with the bias voltage input of described voltage comparator.
3. the computer circuits structure realizing solar cell for supplying power and automatically switch according to claim 2, it is characterized in that, described power switch comprises:
Switch control element, in order to the voltage of dry cell described in selecting according to the comparative result of described voltage comparator to export or the voltage of described solar cell to the power input of described counter;
Self-start circuit, the input end of this self-start circuit is connected with the output terminal of described switch control element;
Biasing circuit, two-way bias voltage is generated in order under the trigger voltage that generates at described self-start circuit, the bias voltage input of the voltage comparator described in the input of first via bias voltage that described biasing circuit exports, the bias voltage input of the load of the counter described in the second road bias voltage input.
4. the computer circuits structure realizing solar cell for supplying power and automatically switch according to claim 3, it is characterized in that, described switch control element comprises:
First PMOS, the grid of this first PMOS is connected with the output terminal of described voltage comparator, the drain electrode of this first PMOS is connected with described dry cell, and the source electrode of this first PMOS is connected with the input end of described phase inverter with the input end of described self-start circuit respectively;
Phase inverter, the output terminal of this phase inverter is connected with the first power input of the load of described counter;
Second PMOS, the output terminal of described voltage comparator is connected by the grid of described phase inverter with this second PMOS, the drain electrode of this second PMOS is connected with the second source input end of the load of described counter with described solar cell respectively, and the source electrode of this second PMOS is connected with the input end of described phase inverter with the input end of described self-start circuit respectively.
5. the computer circuits structure realizing solar cell for supplying power and automatically switch according to claim 4, it is characterized in that, described switch control element also comprises the first parasitic diode and the second parasitic diode, between the drain electrode that the first described parasitic diode is connected to the first described PMOS and substrate, between the drain electrode that the second described parasitic diode is connected to the second described PMOS and substrate.
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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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| CN105975429A (en) * | 2016-05-18 | 2016-09-28 | 哈尔滨理工大学 | Portable multifunctional calculator |
| CN117220399A (en) * | 2023-09-13 | 2023-12-12 | 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 |
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| CN117220399A (en) * | 2023-09-13 | 2023-12-12 | 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 |
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