CN113541332A - Low-voltage auxiliary starting circuit for low-inductance wireless charging system and working method - Google Patents
Low-voltage auxiliary starting circuit for low-inductance wireless charging system and working method Download PDFInfo
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- CN113541332A CN113541332A CN202110824190.9A CN202110824190A CN113541332A CN 113541332 A CN113541332 A CN 113541332A CN 202110824190 A CN202110824190 A CN 202110824190A CN 113541332 A CN113541332 A CN 113541332A
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- 238000001514 detection method Methods 0.000 claims description 14
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000011017 operating method Methods 0.000 claims 2
- 230000001276 controlling effect Effects 0.000 description 9
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
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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 low-voltage auxiliary starting circuit and method for a low-inductance wireless charging system and the wireless charging system, wherein the low-voltage auxiliary 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 low-voltage auxiliary starting circuit comprises an auxiliary starting switching tube Q5 and a low-voltage starting signal generating circuit; the source electrode of the auxiliary starting switch tube Q5 is grounded, the drain electrode is connected to the rectifier SR, and the grid electrode is connected with the low-voltage starting signal generating circuit; the low-voltage starting signal generating circuit is used for controlling the auxiliary starting switch tube Q5 to be conducted to the ground. The invention can normally start the MCU at the receiving end of the wireless charging system under the condition of low voltage.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a low-voltage auxiliary starting circuit for a low-inductance wireless charging system, a working method 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 invention aims to provide a low-voltage auxiliary starting circuit for a low-inductance wireless charging system, a working method and the wireless charging system, so as to solve the technical problems.
The invention provides a low-voltage auxiliary 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 low-voltage auxiliary starting circuit comprises an auxiliary starting switching tube Q5 and a low-voltage starting signal generating circuit; the source electrode of the auxiliary starting switch tube Q5 is grounded, the drain electrode is connected to the rectifier SR, and the grid electrode is connected with the low-voltage starting signal generating circuit; the low-voltage starting signal generating circuit is used for controlling the auxiliary starting switch tube Q5 to be conducted to the ground.
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 Q1 and the drain of the rectifier Q2 and a connection point ac2 between the source of the rectifier Q3 and the drain of the rectifier Q4.
In one embodiment, the low-voltage auxiliary starting circuit for the low inductance wireless charging system is characterized in that the drain of the auxiliary starting switching tube Q5 is connected to the connection point ac 1.
In one embodiment, the drain of the auxiliary start switch Q5 is connected to the connection point ac 2.
Furthermore, the low-voltage starting signal generating circuit comprises a voltage-multiplying logic control module and a chip starting voltage detection module;
the input end of the voltage-doubling logic control module is connected with a voltage input end Vrect, and the output end of the voltage-doubling logic control module is connected with the grid electrode of an auxiliary starting switch tube Q5;
the input end of the chip starting voltage detection module is connected with a voltage input end Vrect, and the output end of the chip starting voltage detection module is connected with an MCU of a wireless charging system receiving end.
The working method of the low-voltage auxiliary starting circuit for the low-inductance wireless charging system comprises the following steps: the auxiliary starting switch tube Q5 is controlled to be conducted to the ground by adopting a low-voltage starting signal generating circuit, so that the rectifier SR is controlled to work in a voltage-multiplying mode, the voltage of the voltage input end Vrect is increased, and sufficient voltage is provided for the normal work of the MCU at the receiving end of the wireless charging system.
Further, the working method of the low-pressure auxiliary starting comprises the following steps:
step S1, the voltage doubling logic control module judges that the voltage of the current voltage input end Vrect reaches 1.4V, when Vrect is more than or equal to 1.4V, the voltage doubling logic control module generates a voltage doubling control signal en _ boost _ mode, outputs the voltage doubling control signal en _ boost _ mode to the grid of the auxiliary starting switch tube Q5, and enables the auxiliary starting switch tube Q5 to be conducted to the ground, thereby controlling the rectifier SR to work in a voltage doubling mode, and enabling the voltage of the voltage input end Vrect to be increased;
step S2, the chip start voltage detection module determines whether the voltage of Vrect at the current voltage input terminal reaches 2.7V, and when Vrect is greater than or equal to 2.7V, the chip start voltage detection module outputs a start signal MCU _ enable to the MCU at the receiving terminal of the wireless charging system, so that the MCU at the receiving terminal of the wireless charging system operates normally.
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 low-voltage auxiliary starting circuit for the low-inductance wireless charging system; the low-voltage auxiliary 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:
the low-voltage auxiliary starting circuit can turn on the auxiliary starting switching tube Q5 to enter a voltage doubling mode under the condition that a receiving end of a wireless charging system is at a low voltage (Vrect is 1.4V), and the voltage of the voltage input end Vrect is raised through the voltage doubling mode, so that an MCU (microprogrammed control Unit) at the receiving end of the wireless charging system works normally, and the starting of the low-inductance wireless charging system is further completed. Compared with the conventional method that the MCU of the receiving end of the wireless charging system can work when the voltage of the voltage input end Vrect slowly meets the requirement condition (Vrect is 2.7V), the method has more advantages in low-voltage starting application, and can realize the starting of the low-inductance wireless charging system.
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 structural diagram of a low-voltage auxiliary starting circuit for a low-inductance wireless charging system according to embodiment 1 of the present invention.
Fig. 3 is a circuit diagram of the auxiliary starting switch Q5 connected to the rectifier SR according to embodiment 2 of the present invention.
Fig. 4 is a circuit diagram of the auxiliary starting switch Q5 connected to the rectifier SR according to embodiment 3 of the present invention.
Fig. 5 is a structural diagram of a low-voltage enable signal generation circuit according to embodiment 5 of 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.
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 low-voltage auxiliary 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.
Example 1
As shown in fig. 2, the low-voltage auxiliary start circuit of the present invention includes an auxiliary start switch Q5 and a low-voltage start signal generating circuit; the source electrode of the auxiliary starting switch tube Q5 is grounded, the drain electrode is connected to the connection point rectifier SR, and the grid electrode is connected with the low-voltage starting signal generating circuit; the low-voltage starting signal generating circuit is used for controlling the auxiliary starting switch tube Q5 to be conducted to the ground, so that the rectifier SR is controlled to work in a voltage doubling mode, the voltage of the voltage input end Vrect is increased, and sufficient voltage is provided for normal work of the MCU at the receiving end of the wireless charging system.
The working method of the low-voltage auxiliary starting circuit for the low-inductance wireless charging system comprises the following steps: the auxiliary starting switch tube Q5 is controlled to be conducted to the ground by adopting a low-voltage starting signal generating circuit, so that the rectifier SR is controlled to work in a voltage-multiplying mode, the voltage of the voltage input end Vrect is increased, and sufficient voltage is provided for the normal work of the MCU at the receiving end of the wireless charging system.
According to the invention, the low-voltage auxiliary starting circuit can turn on the auxiliary starting switch tube Q5 to enter the voltage doubling mode under the condition that the receiving end of the wireless charging system is at a low voltage, and the voltage of the voltage input end Vrect is raised through the voltage doubling mode, so that the MCU at the receiving end of the wireless charging system works normally, and the starting of the low-inductance wireless charging system is further completed. Compared with the conventional method that the MCU of the receiving end of the wireless charging system can work when the voltage of the voltage input end Vrect slowly meets the requirement, the method has more advantages in low-voltage starting application, and can realize the starting of the low-inductance wireless charging system.
Example 2
Further explained on the basis of embodiment 1, as shown in fig. 3, 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 Q1 and the drain of the rectifier Q2 and a connection point ac2 between the source of the rectifier Q3 and the drain of the rectifier Q4. The drain of the auxiliary starting switch tube Q5 is connected to the connection point ac 1.
Example 3
Further explained on the basis of embodiment 1, as shown in fig. 4, 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 Q1 and the drain of the rectifier Q2 and a connection point ac2 between the source of the rectifier Q3 and the drain of the rectifier Q4. The drain of the auxiliary starting switch tube Q5 is connected to the connection point ac 2.
As can be seen from the embodiments 2 and 3, the connection position of the auxiliary starting switch Q5 on the rectifier SR is not limited, and only needs to satisfy the requirement of controlling the rectifier SR to operate in the voltage doubling mode by conducting to ground.
In the case of the example 4, the following examples are given,
further, on the basis of embodiments 2 and 3, a parasitic diode is present between the drain and the source of each of the rectifier Q1, the rectifier Q2, the rectifier Q3, the rectifier Q4, and the auxiliary start switch Q5.
Example 5
Further explained on the basis of embodiments 1 to 4, as shown in fig. 5, the low-voltage start signal generating circuit includes a voltage-doubling logic control module and a chip start voltage detecting module;
the input end of the voltage-doubling logic control module is connected with a voltage input end Vrect, and the output end of the voltage-doubling logic control module is connected with the grid electrode of an auxiliary starting switch tube Q5;
the input end of the chip starting voltage detection module is connected with a voltage input end Vrect, and the output end of the chip starting voltage detection module is connected with an MCU of a wireless charging system receiving end.
Therefore, the working method of the low-voltage auxiliary starting circuit for the low-inductance wireless charging system specifically comprises the following steps:
step S1, the voltage doubling logic control module judges that the voltage of the current voltage input end Vrect reaches 1.4V, when Vrect is more than or equal to 1.4V, the voltage doubling logic control module generates a voltage doubling control signal en _ boost _ mode, outputs the voltage doubling control signal en _ boost _ mode to the grid of the auxiliary starting switch tube Q5, and enables the auxiliary starting switch tube Q5 to be conducted to the ground, thereby controlling the rectifier SR to work in a voltage doubling mode, and enabling the voltage of the voltage input end Vrect to be increased;
step S2, the chip start voltage detection module determines whether the voltage of Vrect at the current voltage input terminal reaches 2.7V, and when Vrect is greater than or equal to 2.7V, the chip start voltage detection module outputs a start signal MCU _ enable to the MCU at the receiving terminal of the wireless charging system, so that the MCU at the receiving terminal of the wireless charging system operates normally.
Therefore, the low-voltage auxiliary starting circuit can turn on the auxiliary starting switching tube Q5 to enter a voltage doubling mode when the receiving end of the wireless charging system is in a low-voltage condition (Vrect is 1.4V), and the voltage of the voltage input end Vrect is raised through the voltage doubling mode, so that the MCU of the receiving end of the wireless charging system works normally, and the low-inductance wireless charging system is started. Compared with the conventional method that the MCU of the receiving end of the wireless charging system can work when the voltage of the voltage input end Vrect slowly meets the requirement condition (Vrect is 2.7V), the method has more advantages in low-voltage starting application, and can realize the starting of the low-inductance wireless charging system.
Example 6
Based on the low-voltage auxiliary starting circuit for the low-inductance wireless charging system realized in the embodiments 1 to 5, the embodiment also realizes a wireless charging system; the wireless charging system comprises a transmitting end and a receiving end, wherein the receiving end is provided with a low-voltage auxiliary starting circuit for the low-inductance wireless charging system in any one of embodiments 1-5; the low-voltage auxiliary starting circuit is used for controlling the rectifier SR to work in a voltage doubling mode under the condition that the coupling voltage at the receiving end of the wireless charging system is lower than the coupling voltage.
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 (8)
1. A low-voltage auxiliary starting circuit for a low-inductance wireless charging system is characterized in that the low-voltage auxiliary 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 low-voltage auxiliary starting circuit comprises an auxiliary starting switching tube Q5 and a low-voltage starting signal generating circuit; the source electrode of the auxiliary starting switch tube Q5 is grounded, the drain electrode is connected to the rectifier SR, and the grid electrode is connected with the low-voltage starting signal generating circuit; the low-voltage starting signal generating circuit is used for controlling the auxiliary starting switch tube Q5 to be conducted to the ground.
2. The low-voltage auxiliary 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 Q1 and the drain of the rectifier Q2 and a connection point ac2 between the source of the rectifier Q3 and the drain of the rectifier Q4.
3. The low-voltage auxiliary starting circuit for the low inductance wireless charging system according to claim 2, wherein a drain of the auxiliary starting switch tube Q5 is connected to a connection point ac 1.
4. The low-voltage auxiliary starting circuit for the low inductance wireless charging system according to claim 2, wherein a drain of the auxiliary starting switch tube Q5 is connected to a connection point ac 2.
5. The low-voltage auxiliary starting circuit for the low-inductance wireless charging system according to claim 1, wherein the low-voltage starting signal generating circuit comprises a voltage-multiplying logic control module and a chip starting voltage detection module;
the input end of the voltage-doubling logic control module is connected with a voltage input end Vrect, and the output end of the voltage-doubling logic control module is connected with the grid electrode of an auxiliary starting switch tube Q5;
the input end of the chip starting voltage detection module is connected with a voltage input end Vrect, and the output end of the chip starting voltage detection module is connected with an MCU of a wireless charging system receiving end.
6. An operating method of a low-voltage auxiliary starting circuit for a low inductance wireless charging system according to any one of claims 1 to 5, wherein the operating method of the low-voltage auxiliary starting circuit comprises: the auxiliary starting switch tube Q5 is controlled to be conducted to the ground by adopting a low-voltage starting signal generating circuit, so that the rectifier SR is controlled to work in a voltage-multiplying mode, the voltage of the voltage input end Vrect is increased, and sufficient voltage is provided for the normal work of the MCU at the receiving end of the wireless charging system.
7. The low-voltage auxiliary starting method for the low-inductance wireless charging system according to claim 6, wherein the low-voltage auxiliary starting method comprises the following steps:
step S1, the voltage doubling logic control module judges that the voltage of the current voltage input end Vrect reaches 1.4V, when Vrect is more than or equal to 1.4V, the voltage doubling logic control module generates a voltage doubling control signal en _ boost _ mode, outputs the voltage doubling control signal en _ boost _ mode to the grid of the auxiliary starting switch tube Q5, and enables the auxiliary starting switch tube Q5 to be conducted to the ground, thereby controlling the rectifier SR to work in a voltage doubling mode, and enabling the voltage of the voltage input end Vrect to be increased;
step S2, the chip start voltage detection module determines whether the voltage of Vrect at the current voltage input terminal reaches 2.7V, and when Vrect is greater than or equal to 2.7V, the chip start voltage detection module outputs a start signal MCU _ enable to the MCU at the receiving terminal of the wireless charging system, so that the MCU at the receiving terminal of the wireless charging system operates normally.
8. 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 a low-voltage auxiliary starting circuit for the low-inductance wireless charging system according to any one of claims 1-5; the low-voltage auxiliary 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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| CN202110824190.9A CN113541332A (en) | 2021-07-21 | 2021-07-21 | Low-voltage auxiliary starting circuit for low-inductance wireless charging system and working method |
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| CN202110824190.9A CN113541332A (en) | 2021-07-21 | 2021-07-21 | Low-voltage auxiliary starting circuit for low-inductance wireless charging system and working method |
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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 |
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Application publication date: 20211022 |
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| RJ01 | Rejection of invention patent application after publication |