CN116111698A - Equipment to be charged and wireless charging system - Google Patents

Abstract

The application discloses wait battery charging outfit and wireless charging system, wireless charging system include wireless charging device and wait battery charging outfit, wait battery charging outfit to include wireless receiving coil, receiving circuit, adjusting circuit, control circuit and battery package. The wireless receiving coil receives electromagnetic signals in a wireless mode, and the receiving circuit converts the electromagnetic signals to obtain first voltage and first current. The regulating circuit regulates the first voltage to output a second voltage, regulates the first current to output a stepwise increasing second current for a second period of time, and outputs a constant second current after the second period of time. By adopting the scheme, the purpose of wireless charging of high-voltage electronic equipment by adopting a short-distance wireless charging technology is fulfilled. In addition, during the rising period of the first voltage obtained by converting the electromagnetic signal by the equipment to be charged, the equipment to be charged is charged with constant current in stages, so that the purpose of charging the equipment to be charged during the rising period of the voltage is achieved, and meanwhile, the charging speed is improved.

Description

Equipment to be charged and wireless charging system

Technical Field

The application relates to the technical field of wireless charging, in particular to equipment to be charged and a wireless charging system.

Background

At present, the charging modes mainly comprise a wired charging mode and a wireless charging mode. When adopting wireless charging mode, need not to connect power and wait to charge equipment through the charging cable, wait to charge the interface that is used for connecting the charging cable on the equipment and can get rid of for it is more convenient to charge.

The charging equipment is provided with a wireless transmitting coil, and the equipment to be charged is provided with a wireless receiving coil. In the charging process, the wireless transmitting coil is aligned with the wireless receiving coil, and the charging equipment generates electromagnetic signals and transmits the electromagnetic signals through the wireless transmitting coil. The wireless receiving coil of the equipment to be charged converts the received electromagnetic signal into current, and the current is subjected to voltage stabilization and other treatments to charge the equipment to be charged.

The wireless charging mode is suitable for electronic equipment with low charging voltage, and cannot charge the electronic equipment with high charging voltage.

Disclosure of Invention

The application provides a wait charging equipment and wireless charging system, wait that charging equipment carries out the rising period of the first voltage that the conversion obtained to electromagnetic signal, through stepwise adjustment first electric current in order to obtain invariable constant current of stage and wait to charge equipment constant current charging, and then realize waiting that charging equipment charges during the voltage rising purpose, improve the charge rate simultaneously.

In a first aspect, an embodiment of the present application provides a device to be charged, including: wireless receiving coil, receiving circuit, regulating circuit, control circuit and battery package that connect gradually, wherein:

the wireless receiving coil is used for receiving electromagnetic signals;

the receiving circuit is used for converting the electromagnetic signal to output a first voltage and a first current, the first voltage is smaller than a constant voltage in a first time period from the start of charging, and the first voltage is equal to the constant voltage after the first time period;

the regulating circuit is used for regulating the first voltage to output a second voltage, regulating the first current to output a step-type increased second current in a second time period and outputting a constant current after the second time period;

and the control circuit is used for carrying out constant current charging on the battery pack according to the second current which is changed stepwise within a second time period from the start of charging, and carrying out constant current charging on the battery pack according to the constant current after the second time period.

In a second aspect, embodiments of the present application provide a wireless charging system, including a wireless charging device and a device to be charged as described above in the first aspect or various possible implementations of the first aspect. Wherein the wireless charging device comprises;

the conversion circuit is used for converting the alternating current to obtain direct current;

the transmitting circuit is used for generating electromagnetic signals according to the direct current output by the converting circuit;

and the wireless transmitting coil is used for transmitting the electromagnetic signal so as to charge the equipment to be charged.

The embodiment of the application provides wait battery charging outfit and wireless charging system, wireless charging system include wireless charging device and wait battery charging outfit, wait battery charging outfit including wireless receiving coil, receiving circuit, adjusting circuit, control circuit and the battery package that connect gradually. The wireless receiving coil receives electromagnetic signals in a wireless mode, the receiving circuit converts the electromagnetic signals to obtain first voltage and first current, and the first voltage can reach stable constant voltage only after a rising stage of a first duration. The regulating circuit regulates the first voltage to output a second voltage, regulates the first current to output a stepwise increasing second current for a second period of time, and outputs a constant second current after the second period of time. And the control circuit performs constant current charging on the battery pack according to the second current which is changed stepwise within a second time period from the start of the work of the receiving circuit, and performs constant current charging on the battery pack by using the constant current, namely the constant second current after the second time period. By adopting the scheme, the regulating circuit of the equipment to be charged can carry out step-up or step-down regulation on the first voltage output by the receiving circuit so as to fulfill the aim of carrying out wireless charging on the high-voltage electronic equipment by adopting a short-distance wireless charging technology. In addition, during the rising period of the first voltage obtained by converting the electromagnetic signal by the equipment to be charged, the first current is regulated stepwise to obtain constant current which is constant in stages, the equipment to be charged is subjected to constant current charging, the purpose of charging the equipment to be charged during the rising period of the voltage is achieved, and meanwhile, the charging speed is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic architecture diagram of a wireless charging system according to an embodiment of the present application;

fig. 2 is another schematic structural diagram of a wireless charging system according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a second current regulation process provided by an embodiment of the present application;

FIG. 4 is a functional block diagram of a wireless charging system provided by an embodiment of the present application;

fig. 5A is a schematic front view of a wireless charging system according to an embodiment of the present application;

FIG. 5B is a side view of FIG. 5A;

FIG. 6 is a flowchart of the wireless charging system according to an embodiment of the present application when applied to a vacuum cleaner;

fig. 7 is a flowchart of a wireless charging system according to an embodiment of the present application when the wireless charging system is applied to a robot.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

In recent years, wireless power transmission technology (Wireless Power Transmission, WPT) has been rapidly developed, particularly wireless power transmission technology of a magnetic coupling system. Wireless charging technology is essentially an application of wireless power transfer technology. Wireless charging is a life style related technology, like bluetooth and Wi-Fi, which radically changes the life style of humans and provides a new level of secure mobility convenience.

Wireless power transmission modes of the wireless charging technology include electromagnetic induction type (magnetic coupling mode), electromagnetic resonance type, and electromagnetic radiation type. Wherein, electromagnetic induction type wireless charging carries out electric energy transmission through coil coupling. Specifically, a wireless transmitting coil is arranged on the wireless charging device, and a wireless receiving coil is arranged on the equipment to be charged. The wireless charging device generates an electromagnetic signal. The device to be charged receives electromagnetic signals through the wireless receiving coil, converts the electromagnetic signals into currents, and charges a battery pack of the device to be charged after the currents are processed through circuits such as rectification and voltage stabilization.

Through adopting wireless charging technique, the interface that is used for connecting the charging cable that waits to charge to set up on the equipment can get rid of. Moreover, the wireless charging device and the equipment to be charged are not required to be connected through a connecting cable in the charging process, so that the charging is more convenient.

From the perspective of the distance between the wireless receiving coil and the wireless transmitting coil, the wireless charging technology may be classified into a short-range wireless charging technology, which is also called a short-range wireless charging technology, and a long-range wireless charging technology, which is also called a long-range wireless charging technology, and the like. Among them, the short-range wireless charging technology has been successfully applied to low-voltage portable electronic devices. Low voltage electronics include, but are not limited to, cell phones, toothbrushes, cardiac pacemakers, and the like. The long-distance wireless charging technology is mainly applied to electric automobiles and the like.

In the short-distance wireless charging technology, a wireless receiving coil converts electromagnetic signals, so that output voltage and output current are obtained. The output voltage is typically a constant voltage, such as 5 volts (V), 12V, 20V, etc., and is typically relatively small, often less than or equal to 20V.

A battery pack is mounted on a low voltage electronic device, and the battery pack includes at most 4 lithium cells connected in series, for example, the lithium cells are cylindrical. The charging voltage required for the battery pack of low voltage electronic devices often does not exceed 20V. Moreover, the lithium battery core has the characteristic of constant current charging. Therefore, constant current charging must be ensured when charging the battery pack.

Obviously, the conventional short-range magnetic coupling mode, i.e. the short-range wireless charging technology, is limited to wireless charging of low-voltage portable electronic devices.

However, some high voltage electronic devices also have a need to employ short range wireless charging technology. The high voltage electronic device means: the battery pack of the electronic device contains at least 5 lithium cells connected in series. Assuming that a battery pack of an electronic device to be charged contains 5 lithium cells, the voltage of each lithium cell after full charge is 4.2V, and if not full charge, the voltage is less than 4.2V. When the voltage of the lithium battery core is larger than 4V, the charging voltage of the battery pack is larger than 20V, and the maximum value of the obtained output voltage is 20V after the electromagnetic signal is converted by the existing short-distance wireless charging technology. Therefore, the existing short-range wireless charging technology cannot charge the electronic device.

In addition, as described above, in the conventional short-range wireless charging technology, the output voltage obtained by converting the electromagnetic signal is a constant voltage, such as 5V, 12V, 20V, or the like. However, when the electromagnetic signal is initially converted, the output voltage does not immediately reach a constant voltage. Taking the constant voltage of 20V as an example, after the wireless receiving coil receives the electromagnetic signal, the output voltage rises from 0V to 20V, and the rising process is about 4 seconds. After 4 seconds, the output voltage was a constant 20V voltage. Wherein the rising time length is related to parameters of a wireless receiving coil of the device to be charged and the like.

It was found by verification that: in the rising process, the output voltage does not reach the constant voltage, so that the output power for converting the electromagnetic signal is smaller than the maximum power. For example, the maximum power is 40W when the constant voltage is 20V and the maximum current is 2A. The power of the battery pack is related to the electric quantity, and in the voltage rising process, the power of the battery pack is more than the output power for converting the electromagnetic signal, so that the battery pack cannot be loaded, i.e. cannot be charged. The battery pack can be charged only after the output voltage is a constant voltage of 20V. When the output voltage rises from 0V to a stable constant voltage for too long, wireless charging efficiency is seriously affected.

Based on this, the embodiment of the application provides a to-be-charged device and a wireless charging system, in the rising period of a first voltage obtained by converting an electromagnetic signal by the to-be-charged device, the second current is adjusted stepwise to obtain a constant current which is constant in stages and to-be-charged device is subjected to constant current charging, and therefore the purpose of charging the to-be-charged device in the voltage rising period is achieved, and meanwhile, the charging speed is improved.

Fig. 1 is a schematic architecture diagram of a wireless charging system according to an embodiment of the present application. Referring to fig. 1, a wireless charging system provided in an embodiment of the present application includes a wireless charging device 100 and a device to be charged 200.

The wireless charging device 100 includes: a conversion circuit 11, a transmitting circuit 12 and a wireless transmitting coil 13. The conversion circuit 11 is also called an ac/dc (ACDC) conversion module, etc., and is used for converting ac to obtain dc. For example, the conversion circuit 11 can convert 220V alternating current into 20V, 2.5A direct current, and supply the direct current to the transmission circuit 12.

The transmitting circuit 12 is also called a wireless charging Transmitter (TX) board for generating an electromagnetic signal from the direct current supplied from the converting circuit 11.

A wireless transmitting coil 13 for transmitting an electromagnetic signal so as to wirelessly charge the device to be charged 200.

The conversion circuit 11, the transmitting circuit 12, and the wireless transmitting coil 13 described above are all provided inside the wireless charging device 100. The wireless charging device 100 has an interface into which a power cord is inserted. After the power line is plugged into the interface, 220V mains is supplied to the conversion circuit 11 of the wireless charging device 100.

The device to be charged 200 includes a wireless receiving coil 21, a receiving circuit 22, a regulating circuit 23, a control circuit 24, and a battery pack 25, which are connected in this order.

A wireless receiving coil 21 for receiving the electromagnetic signal emitted from the wireless emitting coil 13 at a short distance.

The receiving circuit 22 is also called a wireless charging receiving (receiving) board for converting the electromagnetic signal to output a first voltage and a first current. The first voltage is stabilized and then a constant voltage. However, a certain period of time is required from the start of charging, that is, from the start of operation of the receiving circuit 22 to the first voltage stabilization, which is called a first period of time, for example, 4 seconds, 6 seconds, 8 seconds, or the like. The embodiments of the present application are not limited. And within a first time period, the first voltage is smaller than the constant voltage, and after the first time period, the first voltage is equal to the constant voltage. The first voltage is stepped or gradually increased to a constant voltage for a first period of time. For example, the first duration is 4 seconds, and the first voltage is 5V when the receiving circuit 22 starts operating from the 0 th second. After 2 seconds, the first voltage is 15V. From the 4 th second, the first voltage increases to 20V, i.e., the first voltage is equal to the constant voltage. That is, the receiving circuit 22 outputs a constant voltage of 20V 4 seconds after it starts operating.

The first current output from the receiving circuit 22 is not a constant current but varies according to a variation in power of the battery pack 25. Assuming that the power of the battery pack 25 is 30 watts (W), the first voltage is 20V, and the first current is 1.5A. After a while, the amount of electricity of the battery pack 25 increases, the power of the battery pack 25 increases to 40W, the first voltage is 20V, and the first current is 2A. The maximum value of the first current is, for example, 2A or the like, and the embodiment of the present application is not limited.

The adjusting circuit 23 is configured to adjust the first voltage to output the second voltage, adjust the first current to output the second current that changes stepwise in the second period, and output the second current that is constant after the second period, that is, output the constant current. This is because the battery pack 25 of the device to be charged contains lithium cells or the like, requiring constant current charging. Therefore, the regulating circuit 23 needs to output a constant current to perform constant current charging of the battery pack 25. The constant current is also referred to as the rated charge current of the battery pack.

Since the first voltage output by the receiving circuit 22 is smaller than the constant voltage during the first period, the battery pack cannot be loaded, i.e., cannot be charged. To solve this problem, in the embodiment of the present application, the adjusting circuit 23 outputs the stepwise varying second current for the second period of time from when the receiving circuit 22 starts to operate, the second current at each stage being smaller than the constant charging current of the battery pack 25. After the second period of time, the regulating circuit 23 outputs a constant current with which the battery pack is charged, thereby constant-current charging the battery pack in stages.

Optionally, in the foregoing embodiment, the second time period is greater than or equal to the first time period. For example, the first voltage output from the receiving circuit 22 of a device to be charged requires 4 seconds to be a stable constant voltage, and the first period is 4 seconds, and the second period is equal to or greater than 4 seconds. When the second duration is equal to 4 seconds, the receiving circuit 22 outputs a stable constant voltage, and the regulating circuit 23 outputs a stable constant current, so that the regulating circuit 23 rapidly outputs the constant current, and the purpose of improving the efficiency of wireless charging is achieved.

When the second time period is longer than 4 seconds, for example, the second time period is 6 seconds, 8 seconds, or the like, and since the second time period is longer than the first time period, the receiving circuit 22 outputs a stable constant voltage, and then the adjusting circuit 23 outputs a stable constant current after a period of time, so that the second current output by the adjusting circuit 23 is ensured to change slowly, but not suddenly, and the stability of wireless charging is improved.

The control circuit 24 is configured to perform constant current charging on the battery pack according to the second current that varies stepwise during a second period from the start of charging, and perform constant current charging on the battery pack according to the constant current after the second period.

In the embodiment of the present application, in the constant current charging process, the charging current entering the battery pack, that is, the second current is not constant, but is changed stepwise. Taking the example of a constant charge current of 1A for the battery pack, the second time period is 4 seconds, and the second current is 200 milliamps, for example, from the start of the operation of the receiving circuit to the 2 nd second. In the next 2 seconds, the second current is 500 milliamps. After another 4 seconds, the second current was 1A. It follows that the whole charging process is divided into three phases;

the first stage: the second current, i.e., the charging current, was 200 milliamps and the duration of the first phase was 2 seconds.

And a second stage: the second current, i.e., the charging current, was 500 milliamps and the duration of the second phase was 2 seconds.

A third stage; the second current, i.e., the charging current, is 1A, and the third phase is a period of time 4 seconds after the start of charging.

Thus, it can be seen that; the second current is a constant current for each phase.

The wireless charging system provided by the embodiment of the application comprises a wireless charging device and equipment to be charged, wherein the equipment to be charged comprises a wireless receiving coil, a receiving circuit, a regulating circuit, a control circuit and a battery pack which are sequentially connected. The wireless receiving coil receives electromagnetic signals in a wireless mode, the receiving circuit converts the electromagnetic signals to obtain first voltage and first current, and the first voltage can reach stable constant voltage only after a rising stage of a first duration. The regulating circuit regulates the first voltage to output a second voltage, regulates the first current to output a stepwise increasing second current for a second period of time, and outputs a constant second current after the second period of time. And the control circuit performs constant current charging on the battery pack according to the second current which is changed stepwise within a second time period from the start of the work of the receiving circuit, and performs constant current charging on the battery pack by using the constant current, namely the constant second current after the second time period. By adopting the scheme, the regulating circuit of the equipment to be charged can carry out step-up or step-down regulation on the first voltage output by the receiving circuit so as to fulfill the aim of carrying out wireless charging on the high-voltage electronic equipment by adopting a short-distance wireless charging technology. In addition, during the rising period of the first voltage obtained by converting the electromagnetic signal by the equipment to be charged, the first current is regulated stepwise to obtain constant current which is constant in stages, the equipment to be charged is subjected to constant current charging, the purpose of charging the equipment to be charged during the rising period of the voltage is achieved, and meanwhile, the charging speed is improved.

Alternatively, in the above embodiment, the wireless receiving coil 21 of the device to be charged 200 receives the electromagnetic signal from the wireless transmitting coil 13 through the close-range magnetic coupling, and the distance between the wireless receiving coil 21 and the wireless transmitting coil 13 is less than or equal to the minimum distance of the close-range magnetic coupling wireless charging.

Illustratively, the wireless receiving coil 21 of the device to be charged 200 and the wireless transmitting coil 13 of the wireless charging apparatus 100 described in the embodiment of the present application are relatively small coils, and for this type of coil, the maximum value of the first voltage obtained by the receiving circuit 22 of the device to be charged 200 according to converting the electromagnetic signal is, for example, 20V. If the first voltage obtained by the receiving circuit of the device to be charged according to the converted electromagnetic signal is larger, for example, larger than 100V, the wireless receiving coil of the device to be charged and the wireless transmitting coil of the wireless charging device are larger in size, and the technology of wireless charging based on the large-size receiving and transmitting coil is not a short-distance wireless charging technology.

In the embodiment of the present application, the size of the wireless receiving coil 21 of the device to be charged 200 and the wireless transmitting coil 13 of the wireless charging device 100 are smaller, and the first voltage of 20V is already larger. In the wireless charging process, the to-be-charged device 200 is closely attached to the wireless charging apparatus 100, so that the wireless transmitting coil 13 is aligned with the wireless receiving coil 21, and further, the distance between the wireless transmitting coil 13 and the wireless receiving coil 21 is smaller than or equal to the minimum distance of the short-distance magnetic coupling wireless charging, for example, 6 mm.

By adopting the scheme, the distance between the wireless receiving coil of the equipment to be charged and the wireless transmitting coil of the wireless charging device is smaller than or equal to the minimum distance of the wireless charging of the short-distance magnetic coupling, so that the charging efficiency of the wireless charging mode of the short-distance magnetic coupling is improved.

In the above embodiment, the wireless charging device 100 is provided with an interface for inserting a power cord. When one end of the power cord is plugged into the interface, the other end is plugged into the socket, etc., thereby providing 200V of alternating current to the wireless charging device 100. Alternatively, the wireless charging system further includes a power supply device 300 for storing electric power. The power supply apparatus 300 is connected to a charging interface on the wireless charging device 100 for supplying 220V of alternating current to the wireless charging device 100. For example, please refer to fig. 2.

Fig. 2 is another schematic structural diagram of the wireless charging system according to the embodiment of the present application. Referring to fig. 2, the power supply apparatus 300 is connected to the wireless charging device 100 through a power line, thereby supplying 220V of alternating current to the wireless charging device 100. In this way, when the device to be charged 200 is charged, if there is no fixed socket or the like to provide 220V ac power, or when there is a power failure, the mobile power supply device 300 provides 220V ac power to the wireless charging device 100, so that the short-distance wireless charging is not limited by the socket, whether there is power or not, and the like, and convenience is provided for the short-distance wireless charging.

Alternatively, in the above embodiment, the regulating circuit 23 includes a step-up module and a step-down module, the second voltage is positively correlated with the amount of electricity of the battery pack, and when the second voltage is greater than the constant voltage, the step-up module steps up the first voltage so that the regulating circuit outputs a second voltage greater than the constant voltage; when the second voltage is smaller than the constant voltage, the voltage reducing module reduces the first voltage so that the regulating circuit outputs a second voltage smaller than the constant voltage.

Illustratively, the receiving circuit 22 outputs a stable first voltage, which is a constant voltage, after a first period of time from when the receiving circuit begins to operate. The first current output by the receiving circuit 22 is not a constant current. Due to the constant current charging, the second current output by the regulating circuit 23 is constant in stages, but the second voltage output by the regulating circuit 23 is not a constant value but is positively correlated with the amount of charge of the battery pack 25. The more the battery pack 25 is charged, the more the power of the battery pack 25 is, the greater the second voltage is. The lower the current of the battery pack 25, the lower the power of the battery pack 25, and the lower the second voltage.

The second voltage is likely to be greater than the first voltage output by the receiving circuit 22. The first voltage is a constant voltage after a first period of time. To meet the requirement, the adjusting circuit 23 includes a step-up module and a step-down module, and when the second voltage is smaller than the first voltage, the adjusting module 23 steps down the first voltage by using the step-down module to obtain the second voltage. When the second voltage is greater than the first voltage, the adjusting circuit 23 boosts the first voltage by using the boosting module to obtain the second voltage.

Taking the battery pack 25 as an example, the battery pack contains 6 lithium cells connected in series, the charge cut-off voltage of each lithium cell is 4.2V, i.e., the voltage when the lithium cell is fully charged is 4.2V. When the electric quantity of the lithium battery cell is 0, the voltage of the lithium battery cell is 2.7V. In addition, the standard voltage of the lithium cell is 3.6V. Since the connection is in series, the voltage when the battery pack 25 is fully charged is 25.2V, the voltage when the battery pack 25 is not charged is 16.2V, and the standard voltage of the battery pack is 21.6V. Assuming that the battery pack 25 starts to charge from the exhaustion of the charge until it is fully charged, the voltage of the battery pack gradually rises from 16.2V until it rises to 25.2V.

In the wireless charging process, since the constant voltage output from the receiving circuit 22 of the device to be charged 200 is 20V, the charging voltage of the battery pack 25 gradually rises from 16.2V until rising to 25.2V. Therefore, when the charging voltage of the battery pack 25 is less than 20V, the step-down module of the regulating circuit 23 operates, thereby obtaining a charging voltage of less than 20V, i.e., the second voltage. When the charging voltage of the battery pack is greater than 20V, the step-up module of the regulator circuit 23 starts to operate, thereby obtaining a charging voltage greater than 20V, i.e., the second voltage.

By adopting the scheme, the regulating circuit of the equipment to be charged comprises a boosting module and a step-down module, and when the charging voltage of the battery pack is smaller than the constant voltage, the step-down module steps down the constant voltage; when the charging voltage of the battery pack is larger than the constant voltage, the constant voltage is boosted by the boosting module, so that the purpose of charging the high-voltage equipment to be charged is achieved.

Alternatively, in the above embodiment, the voltage reducing module of the adjusting circuit 23 is a buck circuit or a charge pump. The charge pump is formed by a plurality of switching devices, and the heat generated by the current flowing through the switching devices is relatively small and almost equivalent to the current directly passing through the conducting wires. Therefore, the charge pump is used as a voltage reducing circuit, so that the purpose of voltage reduction is realized, and meanwhile, the generation of heat is reduced.

Optionally, in the above embodiment, the adjusting circuit 23 is further configured to set the second current to a minimum charging current from the start of charging, where the minimum charging current is smaller than a maximum charging current, and the maximum charging current is a maximum charging current when the first voltage is minimum, the first current is maximum, and the battery pack power is maximum.

Illustratively, from the above, it can be seen that: the first voltage is smaller than the constant voltage within the first time period, so that the battery pack cannot be loaded, the rated charging current required by the battery pack cannot be utilized, namely, the constant current cannot be generated and the battery pack cannot be charged. For example, if the battery pack 25 includes 5 lithium battery cells connected in series, the voltage at the time of 0 battery pack charge is 2.7x5=13.5v, the standard voltage of the battery pack is 3.6x5=18v, and the voltage at the time of full battery pack charge is 4.2x5=21v. If the rated charge current of the battery pack, that is, the second current output from the regulating circuit 23 after the second period of time is 1A, the power of the battery pack 25 in different states is 13.5W, 18W, and 21W in sequence. The time required for the first voltage of the receiving circuit 22 to rise from 0V to 20V is 4 seconds, and the maximum value of the first current is 2A. When the first voltage is 5V, the maximum output power of the receiving circuit 22 is 10W, which is smaller than the power when the amount of power of the battery pack 25 is 0, so that the battery pack 25 cannot be charged during the first voltage rising.

For this reason, when the receiving circuit 22 of the device to be charged 200 is initially operated, the adjusting circuit 23 sets the second charging current to a minimum charging current since the start of charging, that is, since the start of operation of the receiving circuit 22. The minimum charge current is less than a maximum charge current that is the maximum charge current when the first voltage is the minimum, the first current is the maximum, and the battery pack power is the maximum. For example, the battery pack 25 contains 7 strings of 1 parallel lithium cells, the minimum charge current of a single lithium cell is 0.01 coulomb (C), the capacity of the battery pack 25 is 4000 milliamperes (mah), and the voltage of the battery pack 25 at full charge is 30V. When the first voltage is 5V and the first current is 2A, the maximum power of the receiving circuit 22 is 10W. Thus, the maximum charging current is 10W/30 v=333 ma. That is, the minimum charge current is less than 333ma. For example, the minimum charge current may range from 40 milliamp to 330 milliamp. From the start of charging, the regulating circuit 23 sets the second current to any one of 40 milliamp-330 milliamp values.

By adopting the scheme, the device to be charged determines the minimum charging current during initial charging according to the minimum value of the first voltage, the maximum value of the first current and the charging current when the battery pack power is maximum, so that the aim of accurately determining the minimum charging current is fulfilled.

Optionally, in the above embodiment, the control circuit 24 is further configured to send the indication information to the adjusting circuit 23 multiple times within the second time period, and a third time period is spaced between two adjacent transmissions. For example, the second duration is 4 seconds, and the third duration is 2 seconds. Correspondingly, the adjusting circuit 23 is further configured to receive the indication information for multiple times, and adjust the second current after receiving the indication information each time, so that the second current changes stepwise in the second duration, and the amplitude adjusted in two adjacent times is a preset amplitude.

In the embodiment of the present application, the control circuit 24 transmits the instruction information to the adjustment circuit 23 once every third period from the initial charge. The adjusting circuit 23 adjusts the second current each time the instruction information is received. For example, please refer to fig. 3. Fig. 3 is a schematic diagram of a second current regulation process provided in an embodiment of the present application.

Referring to fig. 3, the first time period is equal to the second time period, and the second current is 1A after the second time period, and charging is started from the 2 nd S. That is, from 0 th second to 2 nd second, the first voltage is 0V, and the second current is 0A. The regulating circuit 23 regulates the second current to 200MA since the start of charging, i.e. from the 2 nd second. At 4 seconds, the control circuit 24 sends an indication to the regulating circuit 23, and the regulating circuit 23 regulates the second current to 500MA after receiving the indication. At 6 seconds, the control circuit 24 sends an instruction to the adjustment circuit 23, and the adjustment circuit 23 adjusts the second current to 1A after receiving the instruction.

By adopting the mode, the regulating circuit regulates the second current after receiving the indication information from the control circuit every time, thereby realizing the purpose of accurately and punctually regulating the second current.

Alternatively, in the above embodiment, the adjusting circuit 23 can flexibly determine how much the second current is adjusted each time. In one mode, the adjusting circuit 23 determines the magnitude of the second current after the current adjustment according to a preset mapping table. For example, the second current after the first adjustment is 500MA and the second current after the second adjustment is 1A.

In another embodiment, the adjusting circuit 23 determines the magnitude of the adjusted second current according to the instruction information sent from the control circuit 24. In this manner, the indication information is a pulse width modulation (pulse width modulation, PWM) signal. The duty cycle of the PWM signal is used to indicate the ratio of the adjusted second current to the constant current. For example, the constant current is 1A, and if the duty ratio is 50%, the adjusted second current is 500MA. If the duty cycle is 100%, the adjusted second current is 1A.

By adopting the scheme, the adjusting circuit of the equipment to be charged determines the magnitude of the adjusted second current according to the duty ratio of the PWM signal transmitted by the control circuit, so that the aim of accurately adjusting the second current is fulfilled.

Alternatively, in the above embodiment, when the constant voltage is 20V, the battery pack includes at least 5 lithium cells connected in series, and the charge cutoff voltage of each lithium cell is 4.2V. That is, the device to be charged is a high-voltage electronic device, i.e. the charging voltage of the battery pack 25 is greater than 20V after a period of time in the wireless charging process.

By adopting the scheme, the battery pack comprises at least 5 lithium battery cells which are connected in series, so that the aim of wirelessly charging high-voltage electronic equipment is fulfilled.

Fig. 4 is a functional block diagram of a wireless charging system provided in an embodiment of the present application. Referring to fig. 4, the conversion circuit 11 of the wireless charging device 100 is connected to a 200V mains supply via a power line, in which a live wire (L) and a Neutral wire (N) are present. The positive electrode of the input voltage of the regulating circuit 23 is VIN+, the negative electrode is VIN-, the positive electrode of the output voltage of the regulating circuit 23 is Vout+, the negative electrode is Vout-, the positive electrode of the input voltage of the battery pack is C+, and the negative electrode is C-.

Alternatively, in the above-described embodiment, the device to be charged 200 may be a cleaner, a washer, a sweeping robot, or the like. Correspondingly, the wireless charging device 100 is a tray, a robot base station, or the like. The wireless charging system described above will be described in detail below taking the to-be-charged device 200 as a cleaning machine and the wireless charging device 100 as a tray as an example. For example, please refer to fig. 5A and 5B.

Fig. 5A is a schematic front view of a wireless charging system according to an embodiment of the present application. Fig. 5B is a side view of fig. 5A. Referring to fig. 5A and 5B, the wireless charging device is a tray 500, the device to be charged is a cleaning machine 600, the tray 500 includes a base 51 cooperating with a machine head 65 of the cleaning machine 600, and a positioning seat 52 is disposed on the base 51. The positioning seat 52 is higher than the base 51. The positioning seat 52 is provided with an interface for inserting a power cord, and the other end of the power cord 54 is inserted into a socket or a power supply device. The base 51 is provided with a conversion circuit, a transmission circuit, and a wireless transmission coil 53.

The device to be charged is the cleaning machine 600, and the rated voltage is greater than 20V. The washer includes a main body 61, a sewer and a clean water tub 62 and 63, a handle 64, and a handpiece 65. Two mounting grooves are arranged at corresponding positions of the machine body 61, wherein the shape and the size of one mounting groove are matched with those of the sewage bucket 62; the shape and the size of the other mounting groove are matched with those of the water cleaning barrel. The head 65 is provided with a roll brush or the like. After the corresponding mounting grooves are formed in the sewage bucket 62 and the clean water bucket 63, the sewage bucket and the clean water bucket participate in forming a part of the outer contour of the machine body 61, so that the cleaning device is more compact in structure. In operation, the clean water bucket 63 sprays water to the cleaning brush through the clean water pipe. The cleaning brush, cleaning surface, dirt suction pipe, etc. of the cleaning apparatus form a closed cavity, and the blower supplies negative pressure through the dirt suction pipe to suck sewage, etc. into the sewage bucket 62. When the cleaning equipment is a ground cleaning machine, the cleaning surface is the ground; when the cleaning equipment is a cloth cleaning machine, the cleaning surface is a sofa, a curtain, a cushion and the like.

The machine head 65 is also provided with a wireless receiving coil 66, a receiving circuit, a regulating circuit, a control circuit and the like, and the machine body 61 is provided with a battery pack. In addition, some or all of the receiving circuit, the adjusting circuit, and the control circuit may be provided on the main body 61, and the embodiment of the present application is not limited.

Referring to fig. 5B, the wireless transmitting coil 53 is aligned with the wireless receiving coil 66, and the distance between the two coils is less than 6 mm to meet the requirement of short-distance wireless charging.

In the wireless charging process, first, the power cord 54 of the tray 500 is plugged into the mains. Next, the cleaning machine 600 is placed in the tray 500. Thereafter, during the first period, the first voltage output from the receiving circuit of the washer 600 is less than the constant voltage, that is, less than 20V. After a first period of time, the first voltage output by the receiving circuit is a constant voltage. The regulating circuit performs step-up or step-down regulation on the first voltage according to the real-time voltage of the battery pack.

And in a second time period from the start of charging, the second current is raised by the first stage of the regulating circuit, so that the second current is rated current after the second time period, and the battery pack of the cleaning machine is charged in constant current in stages.

Similarly, when the wireless charging device is a tray of the dust collector and the device to be charged is the dust collector, the wireless charging process can be seen in fig. 6. Fig. 6 is a flowchart of the wireless charging system according to the embodiment of the present application when applied to a vacuum cleaner. The embodiment comprises the following steps:

601. the power cord of the tray is plugged into the mains.

602. The cleaner is placed in a tray.

603. The dust collector adjusts the first voltage and the first current output by the receiving circuit to obtain the second voltage and the second current, and charges the battery pack of the dust collector by using the second current.

Illustratively, the first voltage output by the receiving circuit of the cleaner is less than a constant voltage, i.e., less than 20V, for a first period of time since the start of charging. After a first period of time, the first voltage output by the receiving circuit is a constant voltage. The regulating circuit performs step-up or step-down regulation on the first voltage according to the real-time voltage of the battery pack.

And in a second time period from the start of charging, the second current is raised by the first stage of the regulating circuit, so that the second current is rated current after the second time period, and the battery pack of the dust collector is charged in constant current in stages.

Fig. 7 is a flowchart of a wireless charging system according to an embodiment of the present application when the wireless charging system is applied to a robot. The embodiment comprises the following steps:

701. and inserting a power line of the robot base station into the commercial power.

702. Placing the sweeping robot into a robot base station.

703. The first voltage and the first current output by the receiving circuit are regulated by the sweeping robot to obtain a second voltage and a second current, and the battery pack of the sweeping robot is charged by the second current.

Illustratively, the first voltage output by the receiving circuit of the robot is less than the constant voltage, i.e., less than 20V, for a first period of time from the start of charging. After a first period of time, the first voltage output by the receiving circuit is a constant voltage. The regulating circuit performs step-up or step-down regulation on the first voltage according to the real-time voltage of the battery pack.

And in a second time period from the start of charging, the second current is raised by the first stage of the regulating circuit, so that the second current is rated current after the second time period, and the battery pack of the robot is charged in constant current in stages.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (11)

1. A device to be charged, characterized by comprising: wireless receiving coil, receiving circuit, regulating circuit, control circuit and battery package that connect gradually, wherein:

the wireless receiving coil is used for receiving electromagnetic signals;

the receiving circuit is used for converting the electromagnetic signal to output a first voltage and a first current, the first voltage is smaller than a constant voltage in a first time period from the start of charging, and the first voltage is equal to the constant voltage after the first time period;

the regulating circuit is used for regulating the first voltage to output a second voltage, regulating the first current to output a step-type increased second current in a second time period and outputting a constant current after the second time period;

and the control circuit is used for carrying out constant current charging on the battery pack according to the second current which is changed stepwise within a second time period from the start of charging, and carrying out constant current charging on the battery pack according to the constant current after the second time period.

2. The apparatus of claim 1, wherein the device comprises a plurality of sensors,

the regulating circuit is further configured to set the second current to a minimum charging current from the start of charging, the minimum charging current being smaller than a maximum charging current, the maximum charging current being a charging current when the first voltage is minimum, the first current is maximum, and the battery pack power is maximum.

3. The apparatus of claim 1, wherein the device comprises a plurality of sensors,

the control circuit is further configured to send indication information to the adjustment circuit multiple times within the second duration, and a third duration is spaced between two adjacent transmissions;

the adjusting circuit is further configured to receive the indication information multiple times, and adjust the second current after receiving the indication information each time, so that the second current changes stepwise in the second duration.

4. The apparatus of claim 3, wherein the device comprises a plurality of sensors,

the indication information is a Pulse Width Modulation (PWM) signal, and the duty ratio of the PWM signal sent by the control circuit each time is used for indicating the ratio of the second current after the current adjustment to the constant current.

5. The apparatus of any of claims 1-4, wherein the second time period is greater than or equal to the first time period.

6. The apparatus according to any one of claim 1 to 4, wherein,

when the constant voltage is 20V, the battery pack includes at least 5 lithium cells connected in series, and the charge cutoff voltage of each lithium cell is 4.2V.

7. The apparatus according to any one of claims 1 to 4, wherein,

the regulating circuit comprises a boosting module and a step-down module, the second voltage is positively related to the electric quantity of the battery pack, and when the second voltage is larger than the constant voltage, the boosting module boosts the first voltage so that the regulating circuit outputs the second voltage larger than the constant voltage;

when the second voltage is smaller than the constant voltage, the voltage reducing module reduces the first voltage so that the regulating circuit outputs a second voltage smaller than the constant voltage.

8. The apparatus of claim 7, wherein the device comprises a plurality of sensors,

the voltage reducing module is a buck circuit or a charge pump.

9. A wireless charging system, comprising: a wireless charging device and an apparatus to be charged according to any one of claims 1 to 8, wherein the wireless charging device comprises;

the conversion circuit is used for converting the alternating current to obtain direct current;

the transmitting circuit is used for generating electromagnetic signals according to the direct current output by the converting circuit;

and the wireless transmitting coil is used for transmitting the electromagnetic signal so as to charge the equipment to be charged.

10. The system of claim 9, wherein the system further comprises a controller configured to control the controller,

the wireless receiving coil of the equipment to be charged receives electromagnetic signals from the wireless transmitting coil through close-range magnetic coupling, and the distance between the wireless coil and the wireless transmitting coil is smaller than or equal to the minimum distance of close-range magnetic coupling wireless charging.

11. The system of claim 9, further comprising;

and the power supply equipment is connected with the charging interface on the wireless charging device and is used for supplying 220V alternating current.

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