CN114204653A - Zero-power-consumption linear charging circuit - Google Patents
Zero-power-consumption linear charging circuit Download PDFInfo
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- CN114204653A CN114204653A CN202210149289.8A CN202210149289A CN114204653A CN 114204653 A CN114204653 A CN 114204653A CN 202210149289 A CN202210149289 A CN 202210149289A CN 114204653 A CN114204653 A CN 114204653A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
Abstract
The invention discloses a zero-power-consumption linear charging circuit, which relates to the technical field of battery charging circuits and comprises a voltage detection analog circuit, a bias current generation circuit, a level transfer circuit, an internal power supply selection circuit and a linear charging module.
Description
Technical Field
The invention relates to the field of battery charging circuits, in particular to a zero-power-consumption linear charging circuit.
Background
At present, along with the quick rise of intelligence wearing, when requiring that the charging adapter does not exist, linear charging circuit's stand-by power consumption is lower and lower. In order to reduce standby power consumption when the charging adapter is not present, it is a common practice for the linear charging circuit to detect whether the charging adapter is present. And when detecting that the adapter does not exist, disabling most of the power consumption modules and entering a low power consumption mode.
Fig. 1 is a structural diagram of a conventional low power consumption linear charging circuit, which includes: the charging adapter detection module, the voltage reference and the linear charging module are used for detecting whether the adapter is inserted or not at any moment when the charging adapter does not exist so as to exit from the low power consumption mode. This requires that the voltage reference module and the charging adapter detection module operate all the time, and both of these two modules need to consume a certain current, resulting in a large standby power consumption.
Disclosure of Invention
Therefore, in order to solve the above technical problem, it is necessary to provide a zero-power linear charging circuit to solve the problem that when a charging adapter is not present, it is necessary to detect whether the adapter is inserted at any time, which results in a large standby power consumption of the charging circuit.
In view of the above, a zero power linear charging circuit includes:
the device comprises a voltage detection analog circuit, a bias current generation circuit, a level transfer circuit, an internal power supply selection circuit and a linear charging module;
the input end of the voltage detection analog circuit is used for inputting the output voltage of the adapter, and the output end of the voltage detection analog circuit is connected with the input end of the level shift circuit and used for outputting a voltage detection signal to the level shift circuit; the output end of the level transfer circuit is connected with the input end of the linear charging module, and the level transfer circuit is used for carrying out level transfer on the voltage detection signal and generating an enabling control signal so as to control the on and off of the linear charging module;
the input end of the bias current generating circuit is used for inputting the output voltage of the adapter, the output end of the bias current generating circuit is connected with the input end of the internal power supply selection circuit, and the bias current generating circuit is used for providing bias current for the internal power supply selection circuit according to the output voltage of the adapter; the input end of the internal power supply selection circuit is further connected with the output end of the voltage detection analog circuit and the output end of the level transfer circuit, the output end of the internal power supply selection circuit is connected with the power supply end of the level transfer circuit and the power supply end of the linear charging module, and the internal power supply selection circuit is used for switching the power supply voltage of the level transfer circuit and the linear charging module from the output voltage of the adapter to the battery voltage when the voltage detection signal and the enabling control signal are both low level.
The scheme has the following beneficial effects:
the zero-power-consumption linear charging circuit comprises a voltage detection analog circuit, a bias current generation circuit, a level transfer circuit, an internal power supply selection circuit and a linear charging module, wherein the voltage detection analog circuit is used for detecting whether an adapter is inserted, when the adapter is not inserted, the voltage detection analog circuit, the level transfer circuit and the bias current generation circuit do not consume power, the internal power supply selection circuit consumes less battery electric energy, and compared with a scheme of detecting whether the adapter is inserted in real time by adopting a chip, the scheme does not need to detect whether the adapter is inserted at any moment, and the overall power consumption is lower. The invention solves the problem that the standby power consumption of the charging circuit is larger due to the fact that whether the charging adapter is inserted or not needs to be detected at any time when the charging adapter does not exist.
Optionally, the voltage detection analog circuit includes: the anode of the first switch tube is used for inputting the output voltage of the adapter, the cathode of the first switch tube is connected with the anode of the second switch tube and outputs a voltage detection signal, and the control ends of the first switch tube and the second switch tube are grounded.
Optionally, the level shift circuit includes: the power supply comprises a resistor, a third switching tube and a first phase inverter, wherein one end of the resistor is connected with the output end of the internal power supply selection circuit, the other end of the resistor is respectively connected with the anode of the third switching tube and the input end of the first phase inverter, a voltage detection signal is input into the control end of the third switching tube, the cathode of the third switching tube is grounded, and the output end of the first phase inverter is an enabling control signal.
Optionally, the internal power selection circuit includes a voltage comparison circuit, the voltage comparison circuit includes a first branch circuit, a second branch circuit and a third branch circuit, an input end of the first branch circuit is used for inputting a battery voltage, a control end of the first branch circuit is used for inputting a voltage detection signal, an output end of the first branch circuit is connected to a control end of the second branch circuit, an input end of the second branch circuit is used for inputting an output voltage of the adapter, an output end of the second branch circuit is connected to an output end of the third branch circuit, an input end of the third branch circuit is used for inputting an enable control signal, and an output end of the third branch circuit is used for outputting the comparison signal.
Optionally, the first branch circuit includes: the positive pole of the fourth switch tube is used for inputting battery voltage, the negative pole of the fourth switch tube is connected with the positive pole of the fifth switch tube, the negative pole of the fifth switch tube is connected with the input end of the first current source, the control end of the fifth switch tube is used for inputting a voltage detection signal, and the output end of the first current source is grounded.
Optionally, the second branch circuit includes: the anode of the sixth switching tube is used for inputting the output voltage of the adapter, the cathode of the sixth switching tube is connected with the input end of the second current source, the control end of the sixth switching tube is connected with the output end of the first branch circuit, and the output end of the second current source is grounded.
Optionally, the third branch circuit includes: the input end of the second phase inverter inputs an enabling control signal, the output end of the second phase inverter is connected with the control end of the seventh switching tube, the anode of the seventh switching tube is connected with the output end of the second branch circuit, and the cathode of the seventh switching tube is grounded.
Optionally, the internal power selection circuit further includes a power selection circuit, the power selection circuit includes a third phase inverter, a fourth phase inverter, an eighth switching tube and a ninth switching tube, an input end of the third phase inverter is connected to an output end of the second branch circuit, an output end of the third inverter is connected to an input end of the fourth phase inverter and a control end of the eighth switching tube, an output end of the fourth phase inverter is connected to a control end of the ninth switching tube, an anode of the eighth switching tube is used for inputting the output voltage of the adapter, an anode of the ninth switching tube is used for inputting the battery voltage, and a cathode of the eighth switching tube is connected to a cathode of the ninth switching tube and is used for outputting the internal selection voltage.
Optionally, the bias current generating circuit includes a tenth switching tube and an eleventh switching tube, an anode of the tenth switching tube is used for inputting the adapter output voltage, and a cathode of the tenth switching tube is connected to an anode of the eleventh switching tube, and is used for outputting a bias voltage signal to control on and off of the first current source or the second current source.
Optionally, the second current source includes a twelfth switching tube, an anode of the twelfth switching tube is connected to a cathode of the sixth switching tube, and a cathode of the twelfth switching tube is grounded.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a block diagram of a low-consumption charging circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of a zero power consumption linear charging circuit provided in an embodiment of the present invention;
FIG. 3 is a circuit diagram of a voltage detection analog circuit and a level shifter circuit provided in an embodiment of the present invention;
FIG. 4 is a circuit diagram of an internal power selection circuit provided in an embodiment of the present invention;
FIG. 5 is a circuit diagram of a bias current generating circuit according to an embodiment of the present invention;
FIG. 6 is a circuit diagram of a current source circuit according to an embodiment of the present invention;
the symbols are as follows:
1. a voltage detection analog circuit; 2. a level shift circuit; 3. a linear charging module; 4. a bias current generating circuit; 5. an internal power supply selection circuit; 51. a voltage comparison circuit; 52. a power supply selection circuit; 511. a first branch circuit; 512. a second branch circuit; 513. a third branch circuit; VIN, output voltage of the adapter; VBAT, battery voltage; VDD, internal select voltage; PM1, a first switch tube; DN1 and a second switch tube; NM1, a third switch tube; PM2 and a fourth switching tube; NM2, fifth switch tube; PM3, sixth switching tube; NM3, seventh switch tube; PM4, eighth switching tube; PM5, ninth switch tube; m1, a tenth switch tube; m2 and an eleventh switch tube; m3 and a twelfth switch tube; INV1, a first inverter; INV2, a second inverter; INV3, a third inverter; INV4, a fourth inverter; vin _ rem, voltage detection signal; en _ chg, enable control signal; IN _ BAT, compare signal; vbath, a first control signal; vinh, a second control signal; vref, bias voltage signal; r1, resistance; i1, a first current source; i2, a second current source; GND and ground.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention.
In one embodiment, there is provided a zero power linear charging circuit structure as shown in fig. 2, the zero power linear charging circuit comprising: the device comprises a voltage detection analog circuit 1, a bias current generation circuit 4, a level shift circuit 2, an internal power supply selection circuit 5 and a linear charging module 3.
The input end of the voltage detection analog circuit 1 is used for inputting the output voltage VIN of the adapter, and the output end of the voltage detection analog circuit 1 is connected with the input end of the level shift circuit 2 and is used for outputting a voltage detection signal VIN _ rem to the level shift circuit 2; the output end of the level shift circuit 2 is connected to the input end of the linear charging module 3, and the level shift circuit 2 is configured to perform level shift on the voltage detection signal vin _ rem, and generate an enable control signal en _ chg to control on and off of the linear charging module 3.
The input end of the bias current generating circuit 4 is used for inputting the output voltage VIN of the adapter, the output end of the bias current generating circuit 4 is connected with the input end of the internal power selection circuit 5, and the bias current generating circuit 4 is used for providing bias current for the internal power selection circuit 5 according to the output voltage VIN of the adapter; the input end of the internal power source selection circuit 5 is further connected to the output end of the voltage detection analog circuit 1 and the output end of the level shift circuit 2, and the output end of the internal power source selection circuit 5 is connected to the power supply end of the level shift circuit 2 and the power supply end of the linear charging module 3, and is configured to switch the power supply voltages of the level shift circuit 2 and the linear charging module 3 from the output voltage VIN of the adapter to the battery voltage VBAT when receiving the voltage detection signal VIN _ rem and the enable control signal en _ chg which are both at a low level.
The specific working process is as follows:
when the output voltage VIN of the adapter is smaller than the second set value V2, it is determined that the adapter is not present, the voltage detection signal VIN _ rem output by the voltage detection analog circuit 1 is at a low level, and the power consumption of the voltage detection analog circuit 1 is 0, and preferably, the first set value V1 is smaller than the second set value V2, so as to ensure that the bias current required by the voltage detection analog circuit 1 is present when the voltage detection analog circuit 1 is enabled.
The voltage detection signal VIN _ rem is input to the internal power selection circuit 5, and when the voltage detection signal VIN _ rem received by the internal power selection circuit 5 is a low level signal, it is recognized that the output voltage VIN of the adapter does not exist, the internal selection voltage VDD is switched to the battery voltage VBAT, and the voltage detection analog circuit 1 pulls down only a current of nA (nano ampere) level from the adapter output voltage VIN. If the adapter is indeed removed, the overall circuit power consumption is 0.
If the voltage detection signal VIN _ rem received by the internal power selection circuit 5 is a high level signal, it is recognized that the output voltage VIN of the adapter exists, the internal power selection circuit 5 compares the output voltage VIN of the adapter with the battery voltage VBAT, according to the comparison result, the internal selection voltage VDD is switched to a high level in the output voltage VIN of the adapter and the battery voltage VBAT, and the internal power selection circuit 5 outputs the internal selection voltage VDD to supply power to the level shift circuit 2 and the linear charging module 3.
The voltage detection signal VIN _ rem is also input to the level shift circuit 2, and the level shift circuit 2 shifts the high level of the voltage detection signal VIN _ rem, so as to shift the voltage domain of the output voltage VIN of the adapter to the voltage domain of the internal selection voltage VDD. When the adapter is removed, that is, when the voltage detection signal vin _ rem is at a low level, the power consumption of the level shift circuit 2 is 0, the enable control signal en _ chg output by the level shift circuit 2 is also at a low level, and when the enable control signal en _ chg is at a low level, the linear charging module 3 is disabled, so that the power consumption of the linear charging module 3 is 0.
When the output voltage VIN of the adapter is greater than the second set value V2, it is recognized that the output voltage VIN of the adapter is present, that is, the adapter is present, and the voltage detection signal VIN _ rem output by the voltage detection analog circuit 1 is a high level signal. The voltage detection signal VIN _ rem passes through the level shift circuit 2, the output voltage VIN of the adapter is converted into the internal selection voltage VDD, and the level shift circuit 2 outputs an enable control signal en _ chg at a high level, so that the linear charging module 3 is enabled to charge the battery.
As shown in fig. 3, the voltage detection analog circuit 1 and the level shift circuit 2 according to an embodiment of the present invention are a circuit diagram, where the voltage detection analog circuit 1 includes a first switch tube PM1 and a second switch tube DN1, the first switch tube PM1 is an enhancement PMOS tube, the second switch tube DN1 is a depletion NMOS tube, the third switch tube NM1 is a depletion NMOS tube, the first switch tube PM1 and the second switch tube DN1 form the voltage detection analog circuit 1, a source of the first switch tube PM1 is connected to an output voltage VIN of an adapter output voltage adapter, a drain of the first switch tube PM1 is connected to a drain of the second switch tube DN1 and outputs a voltage detection signal VIN _ rem, a gate of the first switch tube PM1 is grounded, and a source and a gate of the second switch tube DN1 are commonly grounded.
The level shift circuit 2 includes a resistor R1, a third switch NM1 and a first inverter INV1, the third switch NM1 is an enhancement NMOS transistor, one end of the resistor R1 is connected to the internal selection voltage VDD, the other end is connected to the input end of the first inverter INV1 and the drain of the third switch NM1, the gate of the third switch NM1 is connected to the voltage detection signal vin _ rem, the voltage detection signal vin _ rem controls the on and off of the third switch NM1, the output end of the first inverter INV1 is the enable control signal en _ chg, and the source of the third switch NM1 is grounded.
The voltage detection analog circuit 1 and the level shift circuit 2 specifically work according to the following principles:
when the output voltage VIN of the adapter is smaller than the threshold voltage of the first switching tube PM1, the first switching tube PM1 is turned off, the power consumption of the voltage detection analog circuit 1 is 0, and the voltage detection signal VIN _ rem is at a low level.
When the voltage detection signal vin _ rem is at a low level, the third switching tube NM1 is turned off, the input of the first inverter INV1 is the internal selection voltage VDD, and the output en _ chg is at a low level. The level shifter circuit 2 consumes 0.
When the output voltage VIN of the adapter is greater than the threshold voltage of the first switch tube PM1, the first switch tube PM1 is turned on, the voltage detection analog circuit 1 consumes current, the voltage detection signal VIN _ rem is at a high level, that is, the output voltage VIN of the adapter, and at this time, the adapter is considered to exist.
Further, by adjusting the size of the second switching tube DN1, the current consumed by the voltage detection analog circuit 1 when the adapter is present can be adjusted.
When the voltage detection signal VIN _ rem is at a high level, the third switching tube NM1 is turned on, the input of the first inverter INV1 is at a low level, the enable control signal en _ chg is at a high level, that is, the internal selection voltage VDD and the high level enable control signal en _ chg enable the linear charging module 3, and the battery voltage VBAT is charged from the output voltage VIN of the adapter.
Further, by adjusting the size of the resistor R1, the current consumed by the level shift circuit 2 can be adjusted.
As shown in fig. 4, the internal power selection circuit 5 according to an embodiment of the present invention includes a voltage comparison circuit 51 and a power selection circuit 52, the voltage comparison circuit includes a first branch circuit 511, a second branch circuit 512 and a third branch circuit 513, an input end of the first branch circuit 511 is used for inputting a battery voltage VBAT, a control end of the first branch circuit 511 is used for inputting a voltage detection signal VIN _ rem, an output end of the first branch circuit 511 is connected to a control end of the second branch circuit 512, an input end of the second branch circuit 512 is used for inputting an output voltage VIN of the adapter, an output end of the second branch circuit 512 is connected to an output end of the third branch circuit 513, an input end of the third branch circuit 513 is used for inputting an enable control signal en _ chg, an output terminal of the third branch circuit 513 is configured to output the comparison signal IN _ BAT.
The first branch circuit 511 includes a fourth switching tube PM2, a fifth switching tube NM2 and a first current source I1, the fourth switching tube PM2 is an enhancement PMOS tube, the fifth switching tube NM2 is an NMOS tube, the source of the fourth switching tube PM2 is connected to the battery voltage VBAT, the drain of the fourth switching tube PM2 is connected to the drain of the fifth switching tube NM2, the source of the fifth switching tube NM2 is connected to the input of the first current source I1, the output of the first current source I1 is grounded, the gate of the fifth switching tube NM2 is connected to the voltage detection signal vin _ rem, and the voltage detection signal vin _ rem is used to control the on and off of the fifth switching tube NM2, so as to control the on and off of the first branch circuit 511.
The second branch circuit 512 includes a sixth switching tube PM3 and a second current source I2, a source of the sixth switching tube PM3 is connected to the output voltage VIN of the adaptor, a drain of the sixth switching tube PM3 is connected to the input terminal of the second current source I2, and an output terminal of the second current source I2 is grounded.
The third branch circuit 513 includes a second inverter INV2 and a seventh switch NM3, the seventh switch NM3 is an NMOS transistor, the enable control signal en _ chg is input to an input end of the second inverter INV2, an output end of the second inverter INV2 is connected to a gate of the seventh switch NM3, a drain of the seventh switch NM3 is connected to a drain of the sixth switch PM3 and is used as the comparison signal IN _ BAT of the voltage comparison circuit 51, and a source of the seventh switch NM3 is grounded.
The power selection circuit 52 includes a third inverter INV3, a fourth inverter INV4, an eighth switch PM4 and a ninth switch PM5, the eighth switch PM4 and the ninth switch PM5 are PMOS transistors, an input terminal of the third inverter INV3 is used for inputting a comparison signal IN _ BAT, an output terminal of the third inverter INV3 is respectively connected to an input terminal of the fourth inverter INV4 and a gate of the eighth switch PM4, an output terminal of the fourth inverter INV4 is connected to a gate of the ninth switch PM5, a source of the eighth switch PM4 is connected to the output voltage VIN of the adaptor, a source of the ninth switch PM5 is connected to the battery voltage VBAT, and a drain of the eighth switch PM4 is connected to a drain of the ninth switch PM5 and outputs an internal selection voltage VDD.
The working principle of the internal power supply selection circuit 5 is as follows: when the voltage detection signal vin _ rem and the enable control signal en _ chg are both at a high level, the voltage comparison circuit 51 normally operates, and when the voltage detection signal vin _ rem and the enable control signal en _ chg are both at a low level, the voltage comparison circuit 51 cannot normally operate, and the comparison signal IN _ BAT output by the voltage comparison circuit 51 is at a low level.
The voltage detection signal vin _ rem and the enable control signal en _ chg always remain in phase, except that the high levels thereof are in different voltage domains. The high level of the voltage detection signal VIN _ rem is the output voltage VIN voltage domain of the adapter, and the high level of the enable control signal en _ chg is the internal selection voltage VDD voltage domain.
When both the voltage detection signal vin _ rem and the enable control signal en _ chg are at a high level, the voltage comparison circuit 51 operates normally. The specific working process is as follows:
when the output voltage VIN of the adapter is greater than the battery voltage VBAT, the gate-source voltage of the sixth switching tube PM3 is greater than the gate-source voltage of the fourth switching tube PM 2. The sixth switching tube PM3 is in a saturation region, and the current flowing through the sixth switching tube PM3 is equal to the first current source I1, and the second current source I2 is equal to the first current source I1, so the current flowing through the sixth switching tube PM3 is equal to the second current source I2.
Since the gate-source voltage of the sixth switching tube PM3 is greater than the gate-source voltage of the fourth switching tube PM2, the current flowing through the sixth switching tube PM3 is greater than the current flowing through the fourth switching tube PM2, that is, the current value flowing through the sixth switching tube PM3 is greater than the current value of the second current source I2, and therefore, the comparison signal IN _ BAT output by the comparison circuit 51 is at a high level.
When the output voltage VIN of the adaptor is less than the battery voltage VBAT, the gate-source voltage of the sixth switching tube PM3 is less than the gate-source voltage of the fourth switching tube PM2, so that the current flowing through the sixth switching tube PM3 is less than the current flowing through the fourth switching tube PM2, that is, the current value flowing through the sixth switching tube PM3 is less than the current value of the second current source I2, and therefore, the comparison signal IN _ BAT output by the comparison circuit 51 is at a low level. When the comparison signal IN _ BAT is at a high level, the first control signal vbath is at a low level, the eighth switch tube PM4 is turned on, the ninth switch tube PM5 is turned off, and the internal selection voltage VDD is equal to the output voltage VIN of the adapter. When the comparison signal IN _ BAT of the voltage comparison circuit 51 is at a low level, the second control signal vinh is at a low level, the ninth switching tube PM5 is turned on, the eighth switching tube PM4 is turned off, and the internal selection voltage VDD is equal to the battery voltage VBAT.
As shown in fig. 5, the circuit diagram of the bias current generating circuit 4 according to an embodiment of the present invention is provided, where the bias current generating circuit 4 includes a tenth switching tube M1 and an eleventh switching tube M2, the tenth switching tube M1 is a depletion-mode MOS transistor, the eleventh switching tube M2 is an enhancement-mode MOS transistor, a drain of the tenth switching tube M1 is used to input the output voltage VIN of the adaptor, a source of the tenth switching tube M1 is connected to a drain of the eleventh switching tube M2 and outputs a bias voltage signal vref, and a source of the eleventh switching tube M2 is grounded. The bias current generating circuit 4 draws current from the output voltage VIN of the adapter, and when the output voltage VIN of the adapter is smaller than a set value, the current of the bias current generating circuit is 0.
As shown in fig. 6, a current source circuit diagram according to an embodiment of the present invention is provided, in which a first current source I1 and a second current source I2 have the same circuit structure, and here, the first current source I1 is taken as an example to explain, the first current source I1 circuit includes a twelfth switching tube M3, the twelfth switching tube M3 is an enhancement MOS tube, a drain of the twelfth switching tube M3 is connected to a source of a fifth switching tube NM2, a gate of the twelfth switching tube M3 is connected to a bias voltage vref, a source of the twelfth switching tube M3 is grounded, the bias voltage vref controls on and off of the twelfth switching tube M3, and when a current exists in the eleventh switching tube M2, a current also exists in the twelfth switching tube M3.
In summary, when the adapter is not plugged in, the power consumption of the voltage detection analog circuit 1, the level shift circuit 2 and the bias current generation circuit 4 is 0, and the internal power selection circuit 5 consumes less battery power, so that the problem that when the charging adapter is not plugged in, whether the adapter is plugged in at any time is required to be detected, and the standby power consumption of the charging circuit is large is solved.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A zero-power linear charging circuit, comprising:
the device comprises a voltage detection analog circuit, a bias current generation circuit, a level transfer circuit, an internal power supply selection circuit and a linear charging module;
the input end of the voltage detection analog circuit is used for inputting the output voltage of the adapter, and the output end of the voltage detection analog circuit is connected with the input end of the level shift circuit and used for outputting a voltage detection signal to the level shift circuit; the output end of the level transfer circuit is connected with the input end of the linear charging module, and the level transfer circuit is used for carrying out level transfer on the voltage detection signal and generating an enabling control signal so as to control the on and off of the linear charging module;
the input end of the bias current generating circuit is used for inputting the output voltage of the adapter, the output end of the bias current generating circuit is connected with the input end of the internal power supply selection circuit, and the bias current generating circuit is used for providing bias current for the internal power supply selection circuit according to the output voltage of the adapter; the input end of the internal power supply selection circuit is further connected with the output end of the voltage detection analog circuit and the output end of the level transfer circuit, the output end of the internal power supply selection circuit is connected with the power supply end of the level transfer circuit and the power supply end of the linear charging module, and the internal power supply selection circuit is used for switching the power supply voltage of the level transfer circuit and the linear charging module from the output voltage of the adapter to the battery voltage when the voltage detection signal and the enabling control signal are both low level.
2. The zero-power linear charging circuit of claim 1, wherein the voltage detection analog circuit comprises: the anode of the first switch tube is used for inputting the output voltage of the adapter, the cathode of the first switch tube is connected with the anode of the second switch tube and outputs a voltage detection signal, and the control ends of the first switch tube and the second switch tube are grounded.
3. The zero-power linear charging circuit of claim 1, wherein the level shifter circuit comprises: the power supply comprises a resistor, a third switching tube and a first phase inverter, wherein one end of the resistor is connected with the output end of the internal power supply selection circuit, the other end of the resistor is respectively connected with the anode of the third switching tube and the input end of the first phase inverter, a voltage detection signal is input into the control end of the third switching tube, the cathode of the third switching tube is grounded, and the output end of the first phase inverter is an enabling control signal.
4. The zero-power-consumption linear charging circuit according to claim 1, wherein the internal power selection circuit comprises a voltage comparison circuit, the voltage comparison circuit comprises a first branch circuit, a second branch circuit and a third branch circuit, an input terminal of the first branch circuit is used for inputting a battery voltage, a control terminal of the first branch circuit is used for inputting a voltage detection signal, an output terminal of the first branch circuit is connected to a control terminal of the second branch circuit, an input terminal of the second branch circuit is used for inputting the output voltage of the adapter, an output terminal of the second branch circuit is connected to an output terminal of the third branch circuit, an input terminal of the third branch circuit is used for inputting an enable control signal, and an output terminal of the third branch circuit is used for outputting a comparison signal.
5. The zero-power linear charging circuit according to claim 4, wherein the first branch circuit comprises: the positive pole of the fourth switch tube is used for inputting battery voltage, the negative pole of the fourth switch tube is connected with the positive pole of the fifth switch tube, the negative pole of the fifth switch tube is connected with the input end of the first current source, the control end of the fifth switch tube is used for inputting a voltage detection signal, and the output end of the first current source is grounded.
6. The zero-power linear charging circuit according to claim 4, wherein the second branch circuit comprises: the anode of the sixth switching tube is used for inputting the output voltage of the adapter, the cathode of the sixth switching tube is connected with the input end of the second current source, the control end of the sixth switching tube is connected with the output end of the first branch circuit, and the output end of the second current source is grounded.
7. The zero-power linear charging circuit according to claim 4, wherein the third branch circuit comprises: the input end of the second phase inverter inputs an enabling control signal, the output end of the second phase inverter is connected with the control end of the seventh switching tube, the anode of the seventh switching tube is connected with the output end of the second branch circuit, and the cathode of the seventh switching tube is grounded.
8. The zero-power-consumption linear charging circuit according to claim 4, wherein the internal power selection circuit further comprises a power selection circuit, the power selection circuit comprises a third inverter, a fourth inverter, an eighth switching tube and a ninth switching tube, an input terminal of the third inverter is connected to an output terminal of the second branch circuit, an output terminal of the third inverter is connected to an input terminal of the fourth inverter and a control terminal of the eighth switching tube, respectively, an output terminal of the fourth inverter is connected to a control terminal of the ninth switching tube, an anode of the eighth switching tube is used for inputting the output voltage of the adaptor, an anode of the ninth switching tube is used for inputting the battery voltage, and a cathode of the eighth switching tube is connected to a cathode of the ninth switching tube and is used for outputting the internal selection voltage.
9. The zero-power-consumption linear charging circuit according to claim 5 or 6, wherein the bias current generating circuit includes a tenth switching tube and an eleventh switching tube, an anode of the tenth switching tube is used for inputting the adapter output voltage, and a cathode of the tenth switching tube is connected to an anode of the eleventh switching tube for outputting a bias voltage signal to control on and off of the first current source or the second current source.
10. The zero-power-consumption linear charging circuit according to claim 6, wherein the second current source comprises a twelfth switching tube, an anode of the twelfth switching tube is connected to a cathode of the sixth switching tube, and a cathode of the twelfth switching tube is grounded.
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| CN114204653B (en) | 2022-07-19 |
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Address after: Building 3A28, Smart Home Phase II, No. 76 Baohe Avenue, Baolong Community, Baolong Street, Longgang District, Shenzhen City, Guangdong Province, 518000 Patentee after: Shenzhen Chuangxin Microelectronics Co.,Ltd. Address before: 518116 Room 401, block a, Longgang smart home, 76 Baohe Avenue, Baolong community, Baolong street, Longgang District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN CHUANGXINWEI MICROELECTRONICS Co.,Ltd. |
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