CN113541331A - Self-adaptive low-voltage starting circuit and method for low-inductance wireless charging system - Google Patents
Self-adaptive low-voltage starting circuit and method for low-inductance wireless charging system Download PDFInfo
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- CN113541331A CN113541331A CN202110823734.XA CN202110823734A CN113541331A CN 113541331 A CN113541331 A CN 113541331A CN 202110823734 A CN202110823734 A CN 202110823734A CN 113541331 A CN113541331 A CN 113541331A
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- 230000003044 adaptive effect Effects 0.000 claims description 18
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- 230000008569 process Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The invention provides a self-adaptive low-voltage starting circuit and a method for a low-inductance wireless charging system and the wireless charging system, wherein the self-adaptive low-voltage starting circuit is used for controlling a rectifier SR to work in a voltage doubling mode when a receiving end of the wireless charging system is in a low-voltage condition; the self-adaptive low-voltage starting circuit comprises a logic control switch tube Q5 and a logic control switch tube Q6; the drain electrode of the logic control switch tube Q5 is connected with the rectifier SR through the source electrode and the drain electrode of the logic control switch tube Q6; the source electrode of the logic control switch tube Q5 is grounded, and the drain electrode of the logic control switch tube Q5 and the source electrode of the logic control switch tube Q6 are both connected with the voltage input end Vrect; the grid electrode of the logic control switch tube Q5 and the grid electrode of the logic control switch tube Q6 are both connected with a register reg _ boost _ sel; the register reg _ boost _ sel outputs a high level or a low level with a software configuration. The invention can be started at 1.4V, and can solve the problem that a receiving end chip can not work normally under the condition of low voltage.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a self-adaptive low-voltage starting circuit and method for a low-inductance wireless charging system and the wireless charging system.
Background
Along with the continuous promotion of wireless charging power, charging current continues to increase, but the increase of electric current leads to the loss multiplication of coil, thereby the promotion of wireless charging power has been restricted, the loss of coil is strongly correlated with the impedance of coil, consequently can reduce the loss through the mode that reduces coil impedance, and the loss of coil is again proportional with the inductance, consequently the impedance of coil can be reduced through the mode that reduces coil inductance, thereby promote the current capacity, raise the power, but the reduction of coil inductance, can lead to the voltage of coupling to diminish, lead to charging the degree of freedom to diminish, when the coupling is relatively poor, can't satisfy the voltage that the chip normally started.
Disclosure of Invention
The present invention provides a self-adaptive low-voltage start circuit and method for a low-inductance wireless charging system, and a wireless charging system, so as to solve the above technical problems.
The invention provides a self-adaptive low-voltage starting circuit for a low-inductance wireless charging system, which is used for controlling a rectifier SR to work in a voltage doubling mode when a receiving end of the wireless charging system is in a low-voltage condition;
the self-adaptive low-voltage starting circuit comprises a logic control switch tube Q5 and a logic control switch tube Q6; the drain electrode of the logic control switch tube Q5 is connected with the rectifier SR through the source electrode and the drain electrode of the logic control switch tube Q6; the source electrode of the logic control switch tube Q5 is grounded, and the drain electrode of the logic control switch tube Q5 and the source electrode of the logic control switch tube Q6 are both connected with the voltage input end Vrect; the grid electrode of the logic control switch tube Q5 and the grid electrode of the logic control switch tube Q6 are both connected with a register reg _ boost _ sel; the register reg _ boost _ sel outputs a high level or a low level with a software configuration.
Further, the rectifier SR comprises a rectifier Q1, a rectifier Q2, a rectifier Q3, a rectifier Q4, a capacitor C and an inductor L; the drain of the rectifying tube Q1 and the drain of the rectifying tube Q3 are connected with the voltage input end Vrect; the source electrode of the rectifier tube Q1 is grounded through the drain electrode and the source electrode of the rectifier tube Q2 in sequence; the source electrode of the rectifier tube Q3 is grounded through the drain electrode and the source electrode of the rectifier tube Q4 in sequence; a capacitor C and an inductor L are connected in series between a connection point ac1 between the source of the rectifier tube Q1 and the drain of the rectifier tube Q2 and a connection point ac2 between the source of the rectifier tube Q3 and the drain of the rectifier tube Q4; the drain of the logic control switch Q5 is connected to the gate of the rectifier Q4 of the rectifier SR via the source and drain of the logic control switch Q6.
Further, the self-adaptive low-voltage starting circuit also comprises a voltage stabilizing diode Zener; the drain of the logic control switch tube Q5 and the source of the logic control switch tube Q6 are both grounded through a Zener diode Zener.
Further, the adaptive low-voltage starting circuit further comprises a resistor R; the drain of the logic control switch transistor Q5 and the source of the logic control switch transistor Q6 are further connected to a voltage input terminal Vrect through a resistor R.
In some embodiments, the breakdown voltage of Zener diode Zener is 5.6V.
The invention also provides a self-adaptive low-voltage starting method for the low-inductance wireless charging system, which is realized by adopting the self-adaptive low-voltage starting circuit and comprises the following steps:
(1) in the starting process of the wireless charging system, the voltage of the voltage input end Vrect slowly rises; the register reg _ boost _ sel is configured through software to keep low level before the receiving end MCU works, at the moment, the logic control switch tube Q5 is closed, and the logic control switch tube Q6 is conducted, so that the grid voltage gate of the rectifier tube Q4 is equal to the voltage of the voltage input end Vrect; when the voltage of the voltage input end Vrect reaches 1.4V or more, the rectifier Q4 is conducted, and the rectifier SR works in a voltage doubling mode, so that the voltage of the voltage input end Vrect is increased, and a sufficiently high voltage is provided for the normal work of the receiving end MCU;
(2) when the receiving end MCU normally operates and then communicates with the transmitting end, the transmitting end transmits more energy to the receiving end, so that the voltage of the voltage input end Vrect increases, and at this time, the rectifier SR does not need to operate in a voltage doubling mode, and the register reg _ boost _ sel is configured by software to output a high level, so that the logic control switch Q5 is turned on, and the logic control switch Q6 is turned off, so that the operating state of the rectifier Q4 is no longer controlled by the voltage of the voltage input end Vrect.
Wherein, a Zener diode Zener is adopted at the drain of the logic control switch tube Q6, so that the drain voltage of the logic control switch tube Q6 does not exceed the breakdown voltage of the Zener diode Zener.
The drain of the logic control switch tube Q6 is current-limited by a resistor R.
The invention also provides a wireless charging system, which comprises a transmitting end and a receiving end, wherein the receiving end is provided with the self-adaptive low-voltage starting circuit for the low-inductance wireless charging system; the self-adaptive low-voltage starting circuit is used for controlling the rectifier SR to work in a voltage doubling mode when the receiving end of the wireless charging system is in a low-voltage condition.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, low-voltage starting is realized by directly utilizing the voltage of the voltage input end vrect, and the voltage of the voltage input end vrect can be controlled to enter a voltage doubling mode by opening the rectifier tube Q4 under the condition of lower voltage (1.4V), so that the voltage of the voltage input end vrect is raised, a receiving end MCU works, and further the starting of the low-inductance wireless charging system is completed.
2. The low-voltage starting control circuit is simple and easy, no peripheral device is additionally arranged, the impedance of the coil is reduced, and self-adaptive low-voltage starting is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a wireless charging system.
Fig. 2 is a schematic structural diagram of an adaptive low-voltage start circuit for a low-inductance wireless charging system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
As shown in fig. 1, it can be seen that energy of a transmitting end and a receiving end is transmitted by coils, the two coils (two coils are respectively connected in series with a blocking capacitor C1 and a blocking capacitor C3) are approximately loosely coupled transformers, voltage of the receiving end depends on voltage of the transmitting end, a coupling coefficient and inductance of the coils of the transmitting end and the receiving end, an MCU is integrated in a chip of the receiving end, working voltage needs to reach 2.7V, and if inductance of the coil of the receiving end is reduced, the coupled voltage is also reduced, even the chip cannot work normally. Therefore, the invention provides a self-adaptive low-voltage starting circuit for a low-inductance wireless charging system, which can be started at 1.4V and is used for controlling a rectifier SR to work in a voltage doubling mode when a receiving end of the wireless charging system is in a low-voltage condition so as to provide enough voltage for a receiving end MCU (microprogrammed control unit), thereby solving the problem that a receiving end chip can not work normally.
As shown in fig. 2, the rectifier SR includes a rectifier Q1, a rectifier Q2, a rectifier Q3, a rectifier Q4, a capacitor C, and an inductor L; the drain of the rectifying tube Q1 and the drain of the rectifying tube Q3 are connected with the voltage input end Vrect; the source electrode of the rectifier tube Q1 is grounded through the drain electrode and the source electrode of the rectifier tube Q2 in sequence; the source electrode of the rectifier tube Q3 is grounded through the drain electrode and the source electrode of the rectifier tube Q4 in sequence; a capacitor C and an inductor L are connected in series between a connection point ac1 between the source of the rectifier tube Q1 and the drain of the rectifier tube Q2 and a connection point ac2 between the source of the rectifier tube Q3 and the drain of the rectifier tube Q4; in some embodiments, a diode is connected between the drain and source of each of the rectifier Q1, the rectifier Q2, the rectifier Q3, and the rectifier Q4.
The self-adaptive low-voltage starting circuit comprises a logic control switch tube Q5 and a logic control switch tube Q6; the drain electrode of the logic control switch tube Q5 is connected with the grid electrode of the rectifier tube Q4 through the source electrode and the drain electrode of the logic control switch tube Q6; the source electrode of the logic control switch tube Q5 is grounded, and the drain electrode of the logic control switch tube Q5 and the source electrode of the logic control switch tube Q6 are both connected with the voltage input end Vrect; the grid electrode of the logic control switch tube Q5 and the grid electrode of the logic control switch tube Q6 are both connected with a register reg _ boost _ sel; the register reg _ boost _ sel outputs a high level or a low level with a software configuration.
The adaptive low-voltage starting method for the low-inductance wireless charging system is implemented by using the adaptive low-voltage starting circuit for the low-inductance wireless charging system, and the working principle of the adaptive low-voltage starting circuit is described in detail below. The self-adaptive low-pressure starting method comprises the following steps:
(1) in the starting process of the wireless charging system, the voltage of the voltage input end Vrect slowly rises; the register reg _ boost _ sel is configured through software to keep a low level (0V) before the receiving end MCU works, at the moment, the logic control switch tube Q5 is closed, and the logic control switch tube Q6 is conducted, so that the gate voltage gate of the rectifier tube Q4 is equal to the voltage of the voltage input end Vrect; when the voltage of the voltage input end Vrect reaches 1.4V or more, the rectifier Q4 is conducted, and the rectifier SR works in a voltage doubling mode, so that the voltage of the voltage input end Vrect is increased, and a sufficiently high voltage is provided for the normal work of the receiving end MCU;
(2) when the receiving end MCU normally operates and then communicates with the transmitting end, the transmitting end transmits more energy to the receiving end, so that the voltage of the voltage input end Vrect increases, and at this time, the rectifier SR does not need to operate in a voltage doubling mode, and the register reg _ boost _ sel is configured by software to output a high level, so that the logic control switch Q5 is turned on, and the logic control switch Q6 is turned off, so that the operating state of the rectifier Q4 is no longer controlled by the voltage of the voltage input end Vrect.
According to the invention, the voltage of the voltage input end vrect is directly utilized for low-voltage starting, and the voltage input end vrect can control the rectifier SR to enter a voltage doubling mode by opening the rectifier Q4 under the condition of lower voltage (1.4V), so that the voltage of the voltage input end vrect is raised, the receiving end MCU works, and the starting of the low-inductance wireless charging system is further completed. The low-voltage starting control is simple and easy, no peripheral device is additionally arranged, the impedance of the coil is reduced, and self-adaptive low-voltage starting is realized.
As further shown in fig. 2, the adaptive low-voltage start-up circuit of the present invention further includes a Zener diode Zener; the drain of the logic control switch tube Q5 and the source of the logic control switch tube Q6 are both grounded through a Zener diode Zener. This embodiment sets the breakdown voltage of the Zener diode Zener to 5.6V. Therefore, the adoption of the Zener diode Zener in the drain of the logic control switch tube Q6 can be realized, so that the drain voltage of the logic control switch tube Q6 does not exceed the breakdown voltage of the Zener diode Zener, i.e., 5.6V.
As further shown in fig. 2, the adaptive low-voltage start-up circuit of the present invention further includes a resistor R; the drain of the logic control switch transistor Q5 and the source of the logic control switch transistor Q6 are further connected to a voltage input terminal Vrect through a resistor R. Therefore, the current can be limited by the resistor R at the drain of the logic control switch tube Q6. The Zener diode Zener and the resistor R can both protect the adaptive low-voltage start-up circuit of the present invention.
Based on the self-adaptive low-voltage starting circuit for the low-inductance wireless charging system, the invention also realizes a wireless charging system, wherein the wireless charging system comprises a transmitting end and a receiving end, and the receiving end is provided with the self-adaptive low-voltage starting circuit for the low-inductance wireless charging system; the self-adaptive low-voltage starting circuit is used for controlling the rectifier SR to work in a voltage doubling mode when the receiving end of the wireless charging system is in a low-voltage condition.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The self-adaptive low-voltage starting circuit is used for controlling a rectifier SR to work in a voltage doubling mode when a receiving end of the wireless charging system is in a low-voltage condition;
the self-adaptive low-voltage starting circuit comprises a logic control switch tube Q5 and a logic control switch tube Q6; the drain electrode of the logic control switch tube Q5 is connected with the rectifier SR through the source electrode and the drain electrode of the logic control switch tube Q6; the source electrode of the logic control switch tube Q5 is grounded, and the drain electrode of the logic control switch tube Q5 and the source electrode of the logic control switch tube Q6 are both connected with the voltage input end Vrect; the grid electrode of the logic control switch tube Q5 and the grid electrode of the logic control switch tube Q6 are both connected with a register reg _ boost _ sel; the register reg _ boost _ sel outputs a high level or a low level with a software configuration.
2. The adaptive low-voltage starting circuit for the low inductance wireless charging system according to claim 1, wherein the rectifier SR comprises a rectifier Q1, a rectifier Q2, a rectifier Q3, a rectifier Q4, a capacitor C and an inductor L; the drain of the rectifying tube Q1 and the drain of the rectifying tube Q3 are connected with the voltage input end Vrect; the source electrode of the rectifier tube Q1 is grounded through the drain electrode and the source electrode of the rectifier tube Q2 in sequence; the source electrode of the rectifier tube Q3 is grounded through the drain electrode and the source electrode of the rectifier tube Q4 in sequence; a capacitor C and an inductor L are connected in series between a connection point ac1 between the source of the rectifier tube Q1 and the drain of the rectifier tube Q2 and a connection point ac2 between the source of the rectifier tube Q3 and the drain of the rectifier tube Q4; the drain of the logic control switch Q5 is connected to the gate of the rectifier Q4 of the rectifier SR via the source and drain of the logic control switch Q6.
3. The adaptive low-voltage start-up circuit for a low inductance wireless charging system according to claim 1, further comprising a Zener diode Zener; the drain of the logic control switch tube Q5 and the source of the logic control switch tube Q6 are both grounded through a Zener diode Zener.
4. The adaptive low-voltage starting circuit for the low inductance wireless charging system according to claim 3, wherein the adaptive low-voltage starting circuit further comprises a resistor R; the drain of the logic control switch transistor Q5 and the source of the logic control switch transistor Q6 are further connected to a voltage input terminal Vrect through a resistor R.
5. The adaptive low-voltage starting circuit for the low-inductance wireless charging system according to claim 1, wherein the breakdown voltage of the Zener diode Zener is 5.6V.
6. An adaptive low-voltage starting method for a low-inductance wireless charging system, wherein the adaptive low-voltage starting method is implemented by using the adaptive low-voltage starting circuit of any one of claims 1 to 5, and comprises the following steps:
(1) in the starting process of the wireless charging system, the voltage of the voltage input end Vrect slowly rises; the register reg _ boost _ sel is configured through software to keep low level before the receiving end MCU works, at the moment, the logic control switch tube Q5 is closed, and the logic control switch tube Q6 is conducted, so that the grid voltage gate of the rectifier tube Q4 is equal to the voltage of the voltage input end Vrect; when the voltage of the voltage input end Vrect reaches 1.4V or more, the rectifier Q4 is conducted, and the rectifier SR works in a voltage doubling mode, so that the voltage of the voltage input end Vrect is increased, and a sufficiently high voltage is provided for the normal work of the receiving end MCU;
(2) when the receiving end MCU normally operates and then communicates with the transmitting end, the transmitting end transmits more energy to the receiving end, so that the voltage of the voltage input end Vrect increases, and at this time, the rectifier SR does not need to operate in a voltage doubling mode, and the register reg _ boost _ sel is configured by software to output a high level, so that the logic control switch Q5 is turned on, and the logic control switch Q6 is turned off, so that the operating state of the rectifier Q4 is no longer controlled by the voltage of the voltage input end Vrect.
7. The adaptive low-voltage starting method for the low inductance wireless charging system according to claim 6, wherein a Zener diode Zener is adopted at the drain of the logic control switch tube Q6, so that the drain voltage of the logic control switch tube Q6 does not exceed the breakdown voltage of the Zener diode Zener.
8. The adaptive low-voltage starting method for the low-inductance wireless charging system according to claim 7, wherein a resistor R is used for limiting the current at the drain of the logic control switch tube Q6.
9. A wireless charging system, characterized in that the wireless charging system comprises a transmitting terminal and a receiving terminal, wherein the receiving terminal is provided with the self-adaptive low-voltage starting circuit for the low-inductance wireless charging system according to any one of claims 1-4; the self-adaptive low-voltage starting circuit is used for controlling the rectifier SR to work in a voltage doubling mode when the receiving end of the wireless charging system is in a low-voltage condition.
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| CN114301148A (en) * | 2022-01-04 | 2022-04-08 | 上海南芯半导体科技股份有限公司 | Low-gain starting circuit for wireless charging system |
| CN114421579A (en) * | 2022-03-29 | 2022-04-29 | 成都市易冲半导体有限公司 | Wireless charging system control circuit and method for controlling rectifier mode through hard wire |
| CN114447899A (en) * | 2021-12-22 | 2022-05-06 | 成都市易冲半导体有限公司 | Voltage-multiplying starting self-adaptive protection circuit and method for wireless charging system |
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| CN114447899A (en) * | 2021-12-22 | 2022-05-06 | 成都市易冲半导体有限公司 | Voltage-multiplying starting self-adaptive protection circuit and method for wireless charging system |
| CN114447899B (en) * | 2021-12-22 | 2023-09-26 | 成都市易冲半导体有限公司 | Voltage doubling starting self-adaptive protection circuit and method for wireless charging system |
| CN114301148A (en) * | 2022-01-04 | 2022-04-08 | 上海南芯半导体科技股份有限公司 | Low-gain starting circuit for wireless charging system |
| CN114421579A (en) * | 2022-03-29 | 2022-04-29 | 成都市易冲半导体有限公司 | Wireless charging system control circuit and method for controlling rectifier mode through hard wire |
| WO2023184659A1 (en) * | 2022-03-29 | 2023-10-05 | 成都市易冲半导体有限公司 | Wireless charging system control circuit and method for controlling rectifier mode via hard wire |
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