CN213693214U - Electronic wallet power supply circuit and electronic wallet - Google Patents
Electronic wallet power supply circuit and electronic wallet Download PDFInfo
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- CN213693214U CN213693214U CN202021953057.0U CN202021953057U CN213693214U CN 213693214 U CN213693214 U CN 213693214U CN 202021953057 U CN202021953057 U CN 202021953057U CN 213693214 U CN213693214 U CN 213693214U
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Abstract
The utility model provides an electronic wallet supply circuit and electronic wallet, wherein, electronic wallet supply circuit includes the NFC antenna, a battery, switch circuit and power conversion circuit, when the NFC field intensity is more weak and leads to the voltage of power conversion circuit output to be less than battery voltage, switch circuit switches on, the battery supplies power alone, when having solved the NFC field intensity and having weakened, the NFC antenna power supply is not enough, lead to the unable normal problem of working of electronic wallet, and simultaneously, when the NFC field intensity is stronger and the voltage of power conversion circuit output is greater than battery voltage, switch circuit turns off, supply power alone by NFC antenna and power conversion circuit, practice thrift the battery power, reduce the energy consumption.
Description
Technical Field
The utility model belongs to the technical field of electronic wallet, especially, relate to an electronic wallet supply circuit and electronic wallet.
Background
The electric energy is obtained through the NFC antenna in the existing NFC electronic wallet, and when the NFC field intensity is weakened, the NFC antenna is insufficient in power supply, so that the electronic wallet cannot work normally.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an electronic wallet supply circuit aims at solving when the NFC field intensity weakens, and the NFC antenna power supply is not enough, leads to the unable problem of normally working of electronic wallet.
A first aspect of an embodiment of the present invention provides an electronic wallet power supply circuit, which includes an NFC antenna, a battery, a switch circuit, and a power conversion circuit;
the power supply input end of the switch circuit is connected with the power supply end of the battery, the power supply input end of the power supply conversion circuit is connected with the NFC antenna, the power supply output end of the switch circuit and the power supply output end of the power supply conversion circuit are connected together to form the power supply output end of the electronic wallet power supply circuit, and the control end of the power supply conversion circuit is connected with the controlled end of the switch circuit;
the power conversion circuit is used for:
receiving an alternating current power supply output by the NFC antenna and converting the alternating current power supply to output a first direct current power supply;
when the voltage of the first direct current power supply is greater than the voltage output by the battery, the switch circuit is controlled to be turned off, and the first direct current power supply is output to the power supply output end of the electronic wallet power supply circuit;
and when the voltage of the first direct current power supply is smaller than the voltage output by the battery, the switch circuit is controlled to be switched on, and the first direct current power supply is cut off to be output to the power supply output end of the electronic wallet power supply circuit.
In one embodiment, the switching circuit includes a first resistor, a second resistor, a first switching unit, a second switching unit, and a third switching unit;
the power input end of the first switch unit is connected with the power end of the battery, the power end of the battery is also connected with the controlled end of the first switch unit through a first resistor, the controlled end of the first switch unit is also connected with the power input end of the second switch unit, the power output end of the first switching unit is connected with the power input end of the third switching unit, the power supply output end of the second switch unit is grounded, the ground end is also connected with the controlled end of the second switch unit through a second resistor, the controlled end of the second switch unit is also connected with the first control end of the power conversion circuit, the second control end of the power conversion circuit is connected with the controlled end of the third switch unit, and the power output end of the power conversion circuit and the power output end of the third switch unit are connected together to form the power output end of the electronic wallet power supply circuit;
the first switching unit disconnects the power supply terminal of the battery from the power supply input terminal of the third switching unit when the controlled terminal thereof receives a high level, and connects the power supply terminal of the battery to the power supply input terminal of the third switching unit when the controlled terminal thereof receives a low level;
the second switch unit connects the ground terminal and the controlled terminal of the first switch unit when the controlled terminal receives a high level, and disconnects the ground terminal and the controlled terminal of the first switch unit when the controlled terminal receives a low level;
the power conversion circuit is used for:
after receiving the alternating current power supply output by the NFC antenna and converting the alternating current power supply to output a first direct current power supply, outputting a high level to the controlled end of the second switch unit and outputting the voltage of the first direct current power supply to the controlled end of the third switch unit;
the third switching unit is turned on when the voltage of the first dc power supply is less than the voltage output from the battery, and is turned off when the voltage of the first dc power supply is greater than the voltage output from the battery.
In one embodiment, the electronic wallet power supply circuit further comprises a switch circuit and a key circuit;
the power input end of the switching circuit, the power output end of the switching circuit and the power output end of the power conversion circuit are interconnected, the power output end of the switching circuit is the power output end of the power supply circuit of the electronic wallet, and the controlled end of the switching circuit is connected with the signal end of the key circuit;
the key circuit is used for outputting a startup and shutdown signal to the startup and shutdown circuit according to the triggering operation of a user;
and the switching circuit is used for switching on or switching off according to the switching signal.
In one embodiment, the power conversion circuit comprises a rectifying circuit and an LDO voltage stabilizing circuit;
the power input end of the rectifying circuit is connected with the NFC antenna, the power output end of the rectifying circuit is connected with the power input end of the LDO voltage stabilizing circuit, the power output end of the LDO voltage stabilizing circuit is connected with the power input end of the switching circuit, and the signal end of the LDO voltage stabilizing circuit is connected with the controlled end of the switching circuit;
the rectification circuit is used for rectifying and converting the alternating current power supply output by the NFC antenna and outputting a first direct current voltage to the LDO voltage stabilizing circuit;
the LDO voltage stabilizing circuit is used for:
converting the first direct current voltage to a second direct current voltage;
when the second direct current voltage is larger than the voltage of the battery, controlling the switch circuit to be switched off, and outputting the second direct current voltage to the switch circuit;
and when the second direct current voltage is smaller than the voltage of the battery, controlling the switch circuit to be switched on, and switching off to output the second direct current voltage to the switch circuit.
In one embodiment, the switching circuit is a triode.
In one embodiment, the rectifier circuit comprises a rectifier bridge and a zener diode connected in anti-parallel at the output of the rectifier bridge.
In one embodiment, the electronic wallet power supply circuit further comprises a charging circuit, a power input end of the charging circuit is used for receiving an external power supply, and a power output end of the charging circuit is connected with a power end of the battery;
the charging circuit is used for converting the external power supply into a second direct current power supply so as to charge the battery.
In one embodiment, the electronic wallet power supply circuit further comprises a discharge control circuit, wherein the discharge control circuit is respectively connected with a power supply end of the battery and a controlled end of the switch circuit;
the discharging control circuit is used for detecting the terminal voltage of the battery and controlling the switch circuit to be switched off when the terminal voltage of the battery is smaller than a preset voltage.
In one embodiment, the electronic wallet circuitry further comprises an indicator light;
the discharge control circuit is also used for controlling the indicator lamp to be lightened when the terminal voltage of the battery is smaller than a preset voltage.
A second aspect of embodiments of the present invention provides an electronic wallet comprising an electronic wallet power supply circuit as described above.
The embodiment of the utility model provides a NFC antenna, a battery, switch circuit and power conversion circuit group electronic wallet supply circuit, when the NFC field intensity is more weak and leads to the voltage of power conversion circuit output to be less than battery voltage, switch circuit switches on, the battery supplies power alone, when having solved the NFC field intensity and having weakened, the NFC antenna power supply is not enough, lead to the unable problem of normal work of electronic wallet, and simultaneously, when the NFC field intensity is stronger and the voltage of power conversion circuit output is greater than battery voltage, switch circuit turns off, by NFC antenna and power conversion circuit power supply, practice thrift the battery power, reduce the energy consumption, NFC antenna and battery switch power supply, thereby guarantee electronic wallet reliable work.
Drawings
Fig. 1 is a schematic view of a first structure of a power supply circuit for an electronic wallet according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a second structure of a power supply circuit for an electronic wallet according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a third structure of a power supply circuit for an electronic wallet according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a fourth structure of a power supply circuit for an electronic wallet according to an embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of the power conversion circuit of FIG. 1;
fig. 6 is a schematic diagram of a fifth structure of a power supply circuit for an electronic wallet according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a sixth structure of a power supply circuit for an electronic wallet according to an embodiment of the present invention.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
A first aspect of embodiments of the present invention provides an electronic wallet power supply circuit 100.
As shown in fig. 1, fig. 1 is a first schematic structural diagram of an electronic wallet power supply circuit 100 according to an embodiment of the present invention, in this embodiment, the electronic wallet power supply circuit 100 includes an NFC antenna 10, a battery 20, a switch circuit 30, and a power conversion circuit 40;
the power input end of the switch circuit 30 is connected with the power end of the battery 20, the power input end of the power conversion circuit 40 is connected with the NFC antenna 10, the power output end of the switch circuit 30 and the power output end of the power conversion circuit 40 are connected together to form the power output end of the electronic wallet power supply circuit 100, and the control end of the power conversion circuit 40 is connected with the controlled end of the switch circuit 30;
a power conversion circuit to:
receiving an alternating current power supply output by the NFC antenna 10 and converting the alternating current power supply to output a first direct current power supply;
when the voltage of the first direct current power supply is greater than the voltage output by the battery 20, the switch circuit 30 is controlled to be turned off, and the first direct current power supply is output to the power supply output end of the electronic wallet power supply circuit 100;
when the voltage of the first dc power is lower than the voltage output from the battery 20, the switch circuit 30 is controlled to be turned on, and the first dc power is turned off to be output to the power output terminal of the electronic wallet power supply circuit 100.
In this embodiment, the NFC antenna 10 interacts with the card reading terminal through near field communication and obtains an ac power from the card reading terminal, the power conversion circuit 40 correspondingly operates according to the field intensity between the NFC antenna 10 and the card reading terminal and converts the received ac power into a first dc power, when the field intensity of the NFC antenna 10 is large and the power provided by the NFC antenna 10 is sufficient to ensure that each module operates, and the voltage of the first dc power output by the power conversion circuit 40 is greater than the voltage output by the battery 20, in order to save the electric quantity of the battery 20, the power conversion circuit 40 controls the switch circuit 30 to be turned off, so as to cut off the output of the battery 20, and the power conversion circuit 40 converts the first dc power output by the power conversion circuit to a rear-stage load or a rear-stage conversion circuit, so that the rear-stage load or the rear-stage conversion circuit obtains a power.
When the field intensity of the NFC antenna 10 is weak and the voltage of the first dc power output by the power conversion circuit 40 is smaller than the voltage output by the battery 20, in order to ensure stable operation of each module, the power conversion circuit 40 stops outputting, controls the switching circuit 30 to be turned on, and provides a working power supply for each module by the battery 20 to ensure stable operation of output power and each module.
The power conversion circuit 40 may be a rectifying and voltage-reducing circuit, and the specific structure is not limited.
The switch circuit 30 may be a controlled switch circuit, such as a transistor, a relay, etc., and may be set according to the structure of the power conversion circuit 40 and the power supply requirement.
In one embodiment, the switching circuit 30 is a transistor, a collector of the transistor is connected to the battery 20, an emitter of the transistor is connected to the power supply output terminal VOUT, a controlled terminal of the transistor is connected to the signal terminal of the power conversion circuit 40, and the transistor is turned on or off according to a level signal received by the controlled terminal, so as to supply or stop power to the battery 20.
The embodiment of the utility model provides a NFC antenna 10, battery 20, switch circuit 30 and 40 electronic wallet power supply circuit 100 of group of power conversion circuit, when the weaker voltage that leads to power conversion circuit 40 output of NFC field intensity is less than battery 20 voltage, switch circuit 30 switches on, battery 20 supplies power alone, when having solved the NFC field intensity and weakening, NFC antenna 10 supplies power inadequately, lead to the unable normal problem of working of electronic wallet, and simultaneously, when the stronger and voltage of power conversion circuit 40 output of NFC field intensity is greater than battery 20 voltage, switch circuit 30 switches off, supply power by NFC antenna 10 and power conversion circuit 40, practice thrift battery 20 electric quantity, reduce battery 20 energy consumption, NFC antenna 10 and battery 20 switch the power supply, thereby guarantee the reliable work of electronic wallet.
As shown in fig. 2, in one embodiment, the switching circuit 30 includes a first resistor 31, a second resistor 32, a first switching unit 33, a second switching unit 34, and a third switching unit 35;
the power input end of the first switch unit 33 is connected with the power end of the battery 20, the power end of the battery 20 is further connected with the controlled end of the first switch unit 33 through the first resistor 31, the controlled end of the first switch unit 33 is further connected with the power input end of the second switch unit 34, the power output end of the first switch unit 33 is connected with the power input end of the third switch unit 35, the power output end of the second switch unit 34 is connected with the ground GND which is further connected with the controlled end of the second switch unit 34 through the second resistor 32, the controlled end of the second switch unit 34 is further connected with the first control end of the power conversion circuit 40, the second control end of the power conversion circuit 40 is connected with the controlled end of the third switch unit 35, and the power output end of the power conversion circuit 40 and the power output end of the third switch unit 35 are connected together to form the power output end of the electronic wallet power supply circuit 100;
the first switching unit 33 disconnects the power supply terminal of the battery 20 from the power supply input terminal of the third switching unit 35 when the controlled terminal thereof receives a high level, and connects the power supply terminal of the battery 20 to the power supply input terminal of the third switching unit 35 when the controlled terminal thereof receives a low level;
the second switching unit 34 connects the ground terminal GND and the controlled terminal of the first switching unit 33 when the controlled terminal thereof receives a high level, and disconnects the ground terminal GND and the controlled terminal of the first switching unit 33 when the controlled terminal thereof receives a low level;
a power conversion circuit 40 for:
after receiving the ac power output by the NFC antenna 10 and converting the ac power to output a first dc power, output a high level to the controlled terminal of the second switching unit 34 and output a voltage of the first dc power to the controlled terminal of the third switching unit 35;
the third switching unit 35 is turned on when the voltage of the first dc power supply is less than the voltage output from the battery 20, and the third switching unit 35 is turned off when the voltage of the first dc power supply is greater than the voltage output from the battery 20.
In this embodiment, the power conversion circuit 40 controls the second switch unit 34 and the third switch unit 35 to be turned on and off simultaneously, outputs a high level to the second switch unit 34 when outputting the first dc power and outputs a voltage of the first dc power to a controlled terminal of the third switch unit 35, at this time, the second switch unit 34 is turned on, at the same time, the first switch unit 33 is turned on, an input terminal of the third switch unit 35 is communicated with the battery 20, the third switch unit 35 is turned on or off according to the voltage of the input terminal and the controlled terminal, when the voltage of the first dc power is greater than the voltage of the battery 20, that is, the voltage of the input terminal of the third switch unit 35 is less than the voltage of the controlled terminal, the third switch unit 35 is turned off, the power conversion circuit 40 outputs the dc power and provides the power, when the voltage of the first dc power is less than the voltage of the battery 20, that is, when the voltage of the input terminal, the third switching unit 35 is automatically turned on, and the battery 20 outputs the dc power and supplies the power, thereby implementing automatic switching of power supply.
The first switch unit 33, the second switch unit 34, and the third switch unit 35 may correspondingly select corresponding switch transistors or switch elements according to the conduction requirement, in one embodiment, the first switch unit 33 is a PMOS transistor, the second switch unit 34 is an NMOS transistor, and the third switch unit 35 is an NPN transistor.
As shown in fig. 3, in one embodiment, the electronic wallet power supply circuit 100 further includes a switch circuit 50 and a key circuit 60;
the power input end of the switching circuit 50, the power output end of the switching circuit 30 and the power output end of the power conversion circuit 40 are interconnected, the power output end of the switching circuit 50 is the power output end of the electronic wallet power supply circuit 100, and the controlled end of the switching circuit 50 is connected with the signal end of the key circuit 60;
the key circuit 60 is used for outputting a power-on/off signal to the power-on/off circuit 50 according to the triggering operation of a user;
and the switching circuit 50 is used for switching on or off according to the switching signal.
In this embodiment, the key circuit 60 is used as an electronic wallet switch, and may be a touch key circuit 60 or a mechanical key circuit 60, and performs on-off control on the power-on/off circuit 50, thereby implementing power-on or power-off operation of the electronic wallet.
The switching circuit 50 may employ a switching component having a controlled function, such as a transistor, a MOS transistor, or the like.
As shown in FIG. 4, in one embodiment, the power conversion circuit 40 includes a rectifying circuit 41 and an LDO regulation circuit 42;
the power input end of the rectifying circuit 41 is connected with the NFC antenna 10, the power output end of the rectifying circuit 41 is connected with the power input end of the LDO voltage stabilizing circuit 42, the power output end of the LDO voltage stabilizing circuit 42 is connected with the power input end of the switching circuit 50, and the signal end of the LDO voltage stabilizing circuit 42 is connected with the controlled end of the switching circuit 30;
the rectifying circuit 41 is configured to perform rectification conversion on an ac power supply output by the NFC antenna 10 and output a first dc voltage to the LDO voltage stabilizing circuit 42;
the LDO voltage regulator circuit 42 is configured to:
converting the first direct current voltage into a second direct current voltage;
when the second dc voltage is greater than the voltage of the battery 20, the switching circuit 30 is controlled to turn off, and the second dc voltage is output to the switching circuit 50;
when the second dc voltage is lower than the voltage of the battery 20, the switching circuit 30 is controlled to be turned on, and the second dc voltage is turned off to be output to the switching circuit 50.
In this embodiment, the rectifying circuit 41 is used for rectification and conversion, the LDO voltage stabilizing circuit 42 is used for further stabilizing the voltage and outputting a second dc voltage, meanwhile, the LDO voltage stabilizing circuit 42 controls the switching circuit 30 to turn on or turn off according to the magnitude of the output dc voltage, and controls the switching circuit 30 to turn off when the second dc voltage is greater than the voltage of the battery 20, the LDO voltage stabilizing circuit 42 provides a power supply for the back-end load or the back-end conversion circuit to reduce the power loss of the battery 20, and controls the switching circuit 30 to turn on when the second dc voltage is less than the voltage of the battery 20, so that the battery 20 outputs the dc power, and provides the power supply for the back-end load or the back-end conversion circuit.
The rectifying circuit 41 may be a full-bridge rectifying circuit 41 or a half-bridge rectifying circuit 41, as shown in fig. 5, in one embodiment, the rectifying circuit 41 includes a rectifying bridge and a zener diode D5, the zener diode D5 is connected in reverse parallel to the output end of the rectifying bridge, the rectifying bridge is used for ac-dc conversion, and the zener diode D5 is used for voltage stabilization.
As shown in fig. 6, in order to improve the endurance of the battery 20, in one embodiment, the electronic wallet power supply circuit 100 further includes a charging circuit 70, a power input terminal of the charging circuit 70 is used for receiving an external power source, and a power output terminal of the charging circuit 70 is connected to a power terminal of the battery 20;
the charging circuit 70 is configured to convert an external power source into a second dc power source to charge the battery 20, the charging circuit 70 may receive the external power source through a charging interface or a power line, perform power conversion to output a dc power source matched with the charging parameter of the battery 20, and further charge the battery 20, the charging circuit 70 may employ a rectification step-down circuit or a voltage stabilizing circuit, and the setting is specifically performed according to the type and size of the received external power source and the charging parameter of the battery 20, which is not limited herein.
As shown in fig. 7, in order to avoid the damage of the battery 20 caused by the over-discharge of the battery 20 and the reduction of the service life, in one embodiment, the electronic wallet power supply circuit 100 further includes a discharge control circuit 80, and the discharge control circuit 80 is respectively connected to the power terminal of the battery 20 and the controlled terminal of the switch circuit 30;
and a discharge control circuit 80 for detecting a terminal voltage of the battery 20, and controlling the switching circuit 30 to turn off when the terminal voltage of the battery 20 is less than a preset voltage.
In this embodiment, when the voltage of the first dc power output by the power conversion circuit 40 is less than the voltage of the battery 20, the switch circuit 30 is turned on, the battery 20 and the power conversion circuit 40 jointly provide power for the subsequent load or the subsequent conversion circuit, as the discharge of the battery 20 proceeds, the electric quantity of the battery 20 decreases, the terminal voltage of the battery 20 decreases, and when the terminal voltage of the battery 20 decreases to a discharge critical value, i.e., a preset voltage, the discharge control circuit 80 outputs a switch signal to force the switch circuit 30 to turn off, thereby preventing the battery 20 from over-discharging and prolonging the service life of the battery 20.
The discharge control circuit 80 may use a comparator, a controller, and other elements to monitor the terminal voltage of the battery 20 and control the switching of the switching circuit 30, and the specific structure is set according to the requirement, and is not limited specifically here.
Meanwhile, in order to prompt the user that the battery capacity is too low for charging in time, in one embodiment, the electronic wallet circuit further includes an indicator lamp 90, and the discharge control circuit 80 is further configured to control the indicator lamp 90 to be turned on when the terminal voltage of the battery 20 is smaller than a preset voltage, so as to inform the user of the discharge state of the battery 20.
The utility model discloses still provide an electronic wallet, this electronic wallet includes electronic wallet supply circuit 100, this electronic wallet supply circuit 100's concrete structure refers to above-mentioned embodiment, because this electronic wallet has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is not repeated here one by one.
In this embodiment, electronic wallet supply circuit 100 realizes the power supply of double-circuit adaptation, and when the NFC field intensity was less than, battery 20 assisted power supply, when having solved the NFC field intensity and weakening, NFC antenna 10 power supply was not enough, leads to the unable problem of normally working of electronic wallet, simultaneously, when the NFC field intensity was stronger, by NFC antenna 10 and power conversion circuit 40 power supply alone, practices thrift battery 20 electric quantity, reduces the battery 20 energy consumption.
The above-mentioned embodiments are only used for illustrating the technical solution 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 should be understood by those skilled 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 power supply circuit for an electronic wallet is characterized by comprising an NFC antenna, a battery, a switching circuit and a power conversion circuit;
the power supply input end of the switch circuit is connected with the power supply end of the battery, the power supply input end of the power supply conversion circuit is connected with the NFC antenna, the power supply output end of the switch circuit and the power supply output end of the power supply conversion circuit are connected together to form the power supply output end of the electronic wallet power supply circuit, and the control end of the power supply conversion circuit is connected with the controlled end of the switch circuit;
the power conversion circuit is used for:
receiving an alternating current power supply output by the NFC antenna and converting the alternating current power supply to output a first direct current power supply;
when the voltage of the first direct current power supply is greater than the voltage output by the battery, the switch circuit is controlled to be turned off, and the first direct current power supply is output to the power supply output end of the electronic wallet power supply circuit;
and when the voltage of the first direct current power supply is smaller than the voltage output by the battery, the switch circuit is controlled to be switched on, and the first direct current power supply is cut off to be output to the power supply output end of the electronic wallet power supply circuit.
2. The electronic wallet power supply circuit of claim 1, wherein the switch circuit comprises a first resistor, a second resistor, a first switch unit, a second switch unit, and a third switch unit;
the power input end of the first switch unit is connected with the power end of the battery, the power end of the battery is also connected with the controlled end of the first switch unit through a first resistor, the controlled end of the first switch unit is also connected with the power input end of the second switch unit, the power output end of the first switching unit is connected with the power input end of the third switching unit, the power supply output end of the second switch unit is grounded, the ground end is also connected with the controlled end of the second switch unit through a second resistor, the controlled end of the second switch unit is also connected with the first control end of the power conversion circuit, the second control end of the power conversion circuit is connected with the controlled end of the third switch unit, and the power output end of the power conversion circuit and the power output end of the third switch unit are connected together to form the power output end of the electronic wallet power supply circuit;
the first switching unit disconnects the power supply terminal of the battery from the power supply input terminal of the third switching unit when the controlled terminal thereof receives a high level, and connects the power supply terminal of the battery to the power supply input terminal of the third switching unit when the controlled terminal thereof receives a low level;
the second switch unit connects the ground terminal and the controlled terminal of the first switch unit when the controlled terminal receives a high level, and disconnects the ground terminal and the controlled terminal of the first switch unit when the controlled terminal receives a low level;
the power conversion circuit is used for:
after receiving the alternating current power supply output by the NFC antenna and converting the alternating current power supply to output a first direct current power supply, outputting a high level to the controlled end of the second switch unit and outputting the voltage of the first direct current power supply to the controlled end of the third switch unit;
the third switching unit is turned on when the voltage of the first dc power supply is less than the voltage output from the battery, and is turned off when the voltage of the first dc power supply is greater than the voltage output from the battery.
3. The electronic wallet power supply circuit of claim 1, further comprising a switch circuit and a key circuit;
the power input end of the switching circuit, the power output end of the switching circuit and the power output end of the power conversion circuit are interconnected, the power output end of the switching circuit is the power output end of the power supply circuit of the electronic wallet, and the controlled end of the switching circuit is connected with the signal end of the key circuit;
the key circuit is used for outputting a startup and shutdown signal to the startup and shutdown circuit according to the triggering operation of a user;
and the switching circuit is used for switching on or switching off according to the switching signal.
4. The electronic wallet power supply circuit of claim 3, wherein the power conversion circuit comprises a rectifier circuit and an LDO voltage regulator circuit;
the power input end of the rectifying circuit is connected with the NFC antenna, the power output end of the rectifying circuit is connected with the power input end of the LDO voltage stabilizing circuit, the power output end of the LDO voltage stabilizing circuit is connected with the power input end of the switching circuit, and the signal end of the LDO voltage stabilizing circuit is connected with the controlled end of the switching circuit;
the rectification circuit is used for rectifying and converting the alternating current power supply output by the NFC antenna and outputting a first direct current voltage to the LDO voltage stabilizing circuit;
the LDO voltage stabilizing circuit is used for:
converting the first direct current voltage to a second direct current voltage;
when the second direct current voltage is larger than the voltage of the battery, controlling the switch circuit to be switched off, and outputting the second direct current voltage to the switch circuit;
and when the second direct current voltage is smaller than the voltage of the battery, controlling the switch circuit to be switched on, and switching off to output the second direct current voltage to the switch circuit.
5. The electronic wallet power supply circuit of claim 4, wherein the switching circuit is a triode.
6. The power supply circuit for electronic purse according to claim 4, characterized in that said rectifying circuit comprises a rectifying bridge and a voltage stabilizing diode, said voltage stabilizing diode is connected in reverse parallel at the output of said rectifying bridge.
7. The power supply circuit for electronic purses according to any one of claims 1 to 6, further comprising a charging circuit, wherein a power input end of the charging circuit is used for receiving an external power supply, and a power output end of the charging circuit is connected with a power supply end of the battery;
the charging circuit is used for converting the external power supply into a second direct current power supply so as to charge the battery.
8. The wallet power supply circuit of claim 7, further comprising a discharge control circuit connected to a power terminal of the battery and a controlled terminal of the switch circuit, respectively;
the discharging control circuit is used for detecting the terminal voltage of the battery and controlling the switch circuit to be switched off when the terminal voltage of the battery is smaller than a preset voltage.
9. The electronic wallet power supply circuit of claim 8, further comprising an indicator light;
the discharge control circuit is also used for controlling the indicator lamp to be lightened when the terminal voltage of the battery is smaller than a preset voltage.
10. An electronic wallet comprising the electronic wallet power supply circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021953057.0U CN213693214U (en) | 2020-09-08 | 2020-09-08 | Electronic wallet power supply circuit and electronic wallet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021953057.0U CN213693214U (en) | 2020-09-08 | 2020-09-08 | Electronic wallet power supply circuit and electronic wallet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213693214U true CN213693214U (en) | 2021-07-13 |
Family
ID=76746573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021953057.0U Active CN213693214U (en) | 2020-09-08 | 2020-09-08 | Electronic wallet power supply circuit and electronic wallet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213693214U (en) |
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2020
- 2020-09-08 CN CN202021953057.0U patent/CN213693214U/en active Active
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