Electric energy transmitting device

Abstract

The embodiment of the present application discloses a kind of electric energy transmitting device.The electric energy transmitting device includes inverter circuit, electric energy transmitting circuit, current detection circuit and control unit, wherein the inverter circuit is connected with DC power supply, for converting DC into AC, the electric energy transmitting circuit is used to transmit electric energy in wireless mode, the current detection circuit is used to detect the current parameter of the electric energy transmitting circuit, the control unit is used to start the electric energy transmitting circuit with lower power, and gradually improve the power until the current parameter reaches the preset current value.Through the electric energy transmitting device, wireless charger can work in a wide range of high voltage input scene without affecting the charging efficiency and increasing the cost.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and more specifically to an electrical energy transmitting device. Background Technology

[0002] Wireless chargers can charge devices wirelessly, and their convenience is increasingly recognized by the public. However, most wireless chargers on the market can only work in low-voltage input scenarios such as 5V, 9V, or 12V, and cannot be used in high-voltage input scenarios with a wider range of 24V-36V.

[0003] In order for wireless chargers to work in a wide range of high-voltage input scenarios, existing technologies usually add a step-down circuit between the wireless charger and the power supply to reduce the input voltage. However, this method will increase power loss, easily cause heat generation, reduce charging efficiency, and also increase costs. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a power transmitting device to enable a wireless charger to operate in a wide range of high-voltage input scenarios without affecting charging efficiency or increasing costs.

[0005] In a first aspect, embodiments of the present invention provide an electrical energy transmitting device, the device comprising:

[0006] An inverter circuit, connected to a DC power supply, is used to convert DC power into AC power.

[0007] An electrical power transmitting circuit, used to transmit electrical energy wirelessly;

[0008] A current detection circuit is used to detect the current parameters of the energy transmitting circuit; and

[0009] The control unit is used to start the power transmission circuit at a low power and gradually increase the power until the current parameter reaches a preset current value.

[0010] Furthermore, the control unit is specifically used for:

[0011] The inverter control signal is output according to the current parameters to control the operating mode of the inverter circuit and the frequency or duty cycle of the AC power converted by the inverter circuit.

[0012] Furthermore, the inverter circuit operates in two modes: half-bridge mode and full-bridge mode.

[0013] The control unit is specifically used for:

[0014] A high-frequency inverter control signal is output in a first preset mode, and the inverter control signal is output in the first preset mode to control the inverter circuit to convert the AC power in the half-bridge mode;

[0015] In response to detecting that the current parameter is lower than a preset current value, the frequency of the inverter control signal is reduced until the current parameter is equal to the preset current value.

[0016] Furthermore, the control unit is also used for:

[0017] In response to the frequency of the inverter control signal meeting a first preset threshold condition, but the current parameter is still detected to be lower than the preset current value, the inverter control signal is output in a second preset mode to control the inverter circuit to convert the AC power in the full-bridge mode.

[0018] Furthermore, the inverter circuit operates in two modes: half-bridge mode and full-bridge mode.

[0019] The control unit is specifically used for:

[0020] The inverter control signal with a low duty cycle is output in a first preset mode, and the inverter control signal is output in the first preset mode to control the inverter circuit to convert the AC power in the half-bridge mode;

[0021] In response to detecting that the current parameter is lower than a predetermined current value, the duty cycle of the inverter control signal is increased until the current parameter is equal to the predetermined current value.

[0022] Furthermore, the control unit is also used for:

[0023] In response to the duty cycle of the inverter control signal meeting the second preset threshold condition, but the current parameter is still detected to be lower than the predetermined current value, the inverter control signal is output in a second preset manner to control the inverter circuit to convert the AC power in the full-bridge mode.

[0024] Furthermore, the inverter circuit operates in two modes: half-bridge mode and full-bridge mode.

[0025] The control unit is specifically used for:

[0026] A high-frequency, low-duty-cycle inverter control signal is output in a first preset mode. The inverter control signal is output in the first preset mode to control the inverter circuit to convert the AC power in the half-bridge mode.

[0027] In response to detecting that the current parameter is lower than a predetermined current value, the duty cycle of the inverter control signal is increased and / or the frequency of the inverter control signal is decreased until the current parameter is equal to the predetermined current value;

[0028] In response to the inverter control signal's duty cycle satisfying a second preset threshold and the inverter control signal's frequency satisfying a first preset threshold, but the current parameter is still detected to be lower than the predetermined current value, the inverter control signal is output in a second preset manner. The inverter control signal output in the second preset manner is used to control the inverter circuit to convert the AC power in the full-bridge mode.

[0029] Furthermore, the power transmitting circuit includes:

[0030] An electrical energy transmitting coil is used to transmit electrical energy wirelessly.

[0031] A compensation capacitor is used to connect in series with the power transmitting coil to form the power transmitting circuit.

[0032] Furthermore, the current detection circuit includes a diode, a first resistor, a capacitor connected in series, and a second resistor connected in parallel with the capacitor.

[0033] Furthermore, the device does not include a step-down circuit.

[0034] The power transmitting device of this invention includes an inverter circuit, a power transmitting circuit, a current detection circuit, and a control unit. The inverter circuit is connected to a DC power supply and converts DC power into AC power. The power transmitting circuit transmits power wirelessly. The current detection circuit detects the current parameters of the power transmitting circuit. The control unit starts the power transmitting circuit at a low power and gradually increases the power until the current parameters reach a preset value. This power transmitting device enables the wireless charger to operate in a wide range of high-voltage input scenarios without affecting charging efficiency or increasing costs. Attached Figure Description

[0035] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0036] Figure 1 This is a schematic diagram of an electric power transmission device according to an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the circuit structure of the power transmission device according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of a pulse signal according to an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of pulse signals with different duty cycles according to an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of pulse signals of different frequencies according to an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the control method according to an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of another control method according to an embodiment of the present invention. Detailed Implementation

[0043] The present invention is described below based on embodiments, but the invention is not limited to these embodiments. In the detailed description of the invention below, certain specific details are described in detail. Those skilled in the art will fully understand the invention even without these details. To avoid obscuring the essence of the invention, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0044] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0045] Furthermore, it should be understood that in the following description, "circuit" refers to a conductive loop consisting of at least one element or sub-circuit connected by electrical or electromagnetic connections. When an element or circuit is said to be "connected" to another element or "connected" between two nodes, it can be directly coupled or connected to another element, or there may be intermediate elements. The connection between elements can be physical, logical, or a combination thereof. Conversely, when an element is said to be "directly coupled to" or "directly connected" to another element, it means that there are no intermediate elements between them.

[0046] Unless the context explicitly requires it, words such as "including" or "contains" in the instruction manual should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to".

[0047] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0048] Figure 1 This is a schematic diagram of an electrical energy transmission device according to an embodiment of the present invention. Figure 1As shown, the power transmitting device 12 includes an inverter circuit 121, a power transmitting circuit 122, a current detection circuit 123, and a control unit 124.

[0049] The inverter circuit 121 is disposed between the DC power supply 11 and the power transmission circuit 122. The inverter circuit 121 is used to convert the DC power output from the DC power supply 11 into AC power and supply it to the power transmission circuit 122.

[0050] Optionally, the inverter circuit 121 can specifically be a bridge inverter. In this embodiment, the inverter circuit 121 can include two operating modes: half-bridge mode and full-bridge mode. In the two different operating modes, the inverter circuit 121 can convert direct current into alternating current with different voltage values ​​to supply the power transmission circuit 122.

[0051] It should be understood that the AC voltage output by inverter circuit 121 in full-bridge mode is approximately twice the AC voltage output in half-bridge mode.

[0052] The power transmitting circuit 122 is used to wirelessly transmit electrical energy to charge the device 13. The device 13 can be any electronic device equipped with the power receiving circuit 132, including but not limited to mobile phones, tablets, or smartwatches.

[0053] Furthermore, the power transmitting circuit 122 includes a power transmitting coil, and the power receiving circuit 132 includes a power receiving coil. After receiving AC power from the inverter circuit 121, the power transmitting circuit 122 generates an alternating magnetic field through its internal power transmitting coil. When the power receiving coil of the power receiving circuit 132 is located within this alternating magnetic field, it generates an alternating current through magnetic induction or magnetic resonance to charge the battery 131 of the device 13. Thus, the power transmitting circuit 122 can wirelessly charge the device 13.

[0054] It should be understood that the positions of the coils inside both devices can be set according to actual needs. In order to ensure charging efficiency, the power transmitting coil in the power transmitting device 12 should be able to be opposite to and as close as possible to the power receiving coil in the device 13 during the charging process.

[0055] The current detection circuit 123 is disposed between the power transmission circuit 122 and the control unit 124. The current detection circuit 123 is used to detect the current parameters in the power transmission circuit 122 and feed back the detected current parameters to the control unit 124.

[0056] Optionally, the current detection circuit 123 can directly detect the current parameter through a current transformer and a resistor, or it can indirectly detect the current parameter by detecting the voltage on the compensation capacitor in the power transmission circuit 122.

[0057] The control unit 124 is connected to the inverter circuit 121. In this embodiment, the control unit 124 can control the switching of the working mode of the inverter circuit 121 and can adjust the frequency or duty cycle of the AC power converted by the inverter circuit 121. Thus, the control unit 124 can control the power transmission power of the power transmission circuit 122.

[0058] Optionally, the control unit 124 may specifically be a hardware circuit integrating a corresponding processor and memory, such as an MCU (Microcontroller Unit). The memory may store a corresponding program, and the processor may execute the program stored in the memory to implement the corresponding charging process.

[0059] Optionally, the control unit 124 may also integrate a corresponding communication unit, enabling the control unit 124 to interact with the device 13 via the communication unit. Optionally, the communication unit may be a Near Field Communication (NFC) unit or a Bluetooth unit, etc.

[0060] Specifically, in practical applications, after the power supply to the power transmitting device 12 is turned on, the control unit 124 controls the inverter circuit 121 to start the power transmitting circuit 122 at a lower power. After the power transmitting circuit 122 is started, the control unit 124 controls the inverter circuit 121 to gradually increase the power according to the current parameters fed back by the current detection circuit 123 until the current parameters reach a preset current value. At this time, the user can place the device 13 on the power transmitting device 12 in a corresponding manner, so that the coils of the two are facing each other and in contact, so that the power transmitting device 12 can charge the device 13.

[0061] Optionally, in order to reduce the power consumption of the power transmitter 12 during the standby phase (i.e., when the user does not place the device 13) without affecting the charging response time, the power transmitter 12 can maintain an intermittent working state during the standby phase. Specifically, in the intermittent working state, the power transmitter 12 will work periodically, that is, it will work for a period of time, then stop working for a period of time, and repeat this cycle.

[0062] Optionally, the working time and working interval of the power transmitting device 12 in the intermittent working state can be set according to actual needs. For example, the power transmitting device 12 can have a cycle of 1 second, the working time can be set to 100ms, and the working interval can be set to 900ms. It should be understood that during each working time, the control unit 124 will start the power transmitting circuit 122 with a low power and then gradually increase the power until the current parameter reaches the preset current value.

[0063] Furthermore, when the power transmitting device 12 detects that the user has placed the device 13, it can switch from intermittent operation to continuous operation. Specifically, in continuous operation, the control unit 124 maintains the current parameter at a preset current value to charge the device 13.

[0064] Optionally, in order to meet the charging needs of different devices, device 13 can also send operating parameter requirement information to power transmitting device 12. Control unit 124 can receive the operating parameter requirement information and adjust the current parameter according to the operating parameter requirement information so that the adjusted current parameter can meet the charging needs of device 13.

[0065] It should be understood that the power transmission of the power transmission circuit 122 is proportional to the current, and the current parameter reaching the preset current value can indicate that the power transmission power of the power transmission circuit 122 meets the preset power transmission requirement.

[0066] Therefore, this embodiment enables the power transmitting device to operate in a wide range of high-voltage input scenarios without the need for a step-down circuit, avoiding problems such as increased power loss, overheating, reduced charging efficiency, and increased cost caused by adding a step-down circuit.

[0067] Figure 2 This is a schematic diagram of the circuit structure of the power transmission device according to an embodiment of the present invention. Figure 2 As shown, the power transmitting device includes an inverter circuit 21, a power transmitting circuit 22, a current detection circuit 23, and a control unit 24.

[0068] The inverter circuit 21 includes a first switching device Q1, a second switching device Q2, a third switching device Q3, and a fourth switching device Q4. In this embodiment, each of the switching devices is an N-channel field-effect transistor. Optionally, each of the switching devices may also be a P-channel field-effect transistor, a corresponding bipolar transistor, or a corresponding insulated-gate bipolar transistor.

[0069] Furthermore, the first switching device Q1 is connected between the positive terminal of the DC power supply and the first common terminal a, the second switching device Q2 is connected between the first common terminal a and the ground terminal, the third switching device Q3 is connected between the positive terminal of the DC power supply and the second common terminal b, and the fourth switching device Q4 is connected between the second common terminal b and the ground terminal.

[0070] Furthermore, the gates of the first switching device Q1, the second switching device Q2, the third switching device Q3, and the fourth switching device Q4 are all connected to the control unit 24. The control unit 24 can output corresponding inverter control signals to control each switching device to turn on and off.

[0071] In this embodiment, the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 will be turned on when a high-level signal is received and turned off when a low-level signal is received.

[0072] Furthermore, the inverter circuit 21 operates in two modes: full-bridge mode and half-bridge mode. The control unit 24 can switch the operating modes of the inverter circuit 21 by controlling each switching device.

[0073] Specifically, in this embodiment, the control unit 24 can control the first switching device Q1 and the fourth switching device Q4 to alternately turn on and off with the second switching device Q2 and the third switching device Q3, so that the inverter circuit 21 can operate in full-bridge mode.

[0074] Figure 3 This is a schematic diagram of a pulse signal according to an embodiment of the present invention. Figure 3 As shown, the control unit 24 can output the following to the first switching device Q1 and the fourth switching device Q4: Figure 3 The pulse signal group shown in Figure 31, and the output to the second switching device Q2 and the third switching device Q3, are as follows: Figure 3 The pulse signal group shown in Figure 32. The pulses in pulse signal group 31 are in the opposite direction to those in pulse signal group 32.

[0075] In this embodiment, the control unit 24 can also control the third switching device Q3 to always remain off, control the fourth switching device Q4 to always remain on, and control the first switching device Q1 and the second switching device Q2 to alternately turn on and off, so that the inverter circuit 21 can operate in half-bridge mode.

[0076] like Figure 3 As shown, the control unit 24 can always output a low-level signal to the third switching device Q3, always output a high-level signal to the fourth switching device Q4, and output a signal to the first switching device Q1 as shown. Figure 3 The pulse signal group shown in Figure 31 outputs the following to the second switching device Q2: Figure 3 The pulse signal group shown in Figure 32.

[0077] In an alternative implementation, the control unit 24 may also control the second switching device Q2 to always be on, control the first switching device Q1 to always be off, and control the third switching device Q3 and the fourth switching device Q4 to alternately be on and off, so that the inverter circuit 21 operates in half-bridge mode.

[0078] Furthermore, the control unit 24 can also adjust the duty cycle and / or frequency of the AC power converted by the inverter circuit 21 by controlling each switching device.

[0079] Figure 4 This is a schematic diagram of pulse signals with different duty cycles according to an embodiment of the present invention. Figure 4 As shown, the control unit 24 can adjust the duty cycle of the AC power converted by the inverter circuit 21 by changing the proportion of the high-level signal in the pulse cycle. The two are directly proportional, as shown in pulse signal groups 41 and 42, where the duty cycle of the AC power corresponding to pulse signal group 42 is higher than that of pulse signal group 41. It should be understood that one pulse cycle specifically refers to outputting one high-level signal and one low-level signal.

[0080] Figure 5 This is a schematic diagram of pulse signals of different frequencies according to an embodiment of the present invention. Figure 5 As shown, the control unit 24 can adjust the frequency of the AC power converted by the inverter circuit 21 by changing the cycle frequency of the pulses. The two are directly proportional, as shown in pulse signal groups 51 and 52. The frequency of the AC power corresponding to pulse signal group 52 is higher than that of pulse signal group 51.

[0081] It should be understood that as the frequency of the AC power converted by the inverter circuit 21 is gradually adjusted from low to high, the impedance of the power transmission circuit 22 will gradually decrease, while the current will gradually increase. When the frequency of the AC power equals the resonant frequency of the inverter circuit, the impedance of the power transmission circuit 22 will decrease to zero, while the current will reach its maximum. As the frequency of the AC power continues to increase, the impedance of the power transmission circuit 22 will increase from zero, while the current will gradually decrease. Therefore, the control unit 24 can control the power transmission power of the power transmission circuit 22 by changing the frequency of the AC power converted by the inverter circuit 21.

[0082] The power transmission circuit 22 is disposed between the first common terminal a and the second common terminal b. The power transmission circuit 22 includes a compensation capacitor C1 and a power transmission coil L1 connected in series. The power transmission coil L1 is used to transmit electrical energy wirelessly, and the compensation capacitor C1 is used to increase the power of the electrical energy transmitted by the power transmission coil L1.

[0083] The current detection circuit 23 is disposed between the power transmission circuit 22 and the control unit 24.

[0084] Furthermore, the current detection circuit 23 includes a diode D1 connected in series, a first resistor R1, a capacitor C2, and a second resistor R2 connected in parallel with the capacitor C2. In this embodiment, the current detection circuit 23 can indirectly determine the current parameters of the power transmission circuit 22 by detecting the voltage value on the compensation capacitor C1, and feed the determined current parameters back to the control unit 24.

[0085] Furthermore, this embodiment of the invention also provides a control method that can control a power transmitting device to wirelessly charge a device.

[0086] Figure 6 This is a schematic diagram of the control method according to an embodiment of the present invention, as shown below. Figure 6 As shown, the control method is specifically applicable to the control unit in the above embodiments, and the control method may specifically include the following steps:

[0087] S100: Output a high-frequency inverter control signal in the first preset mode.

[0088] Specifically, the inverter control signal is output in the first preset manner to control the inverter circuit to convert the AC power in half-bridge mode.

[0089] Specifically, after the power supply to the power transmitting device is turned on, the control unit can output a high-frequency inverter control signal in a first preset manner, so that the inverter circuit can start the power transmitting circuit with a lower power.

[0090] Optionally, the specific start frequency of the inverter control signal can be set and adjusted according to actual conditions.

[0091] Optionally, with Figure 3 Taking the inverter circuit shown as an example, the output of the inverter control signal in the first preset mode can specifically be to always output a low-level signal to the third switching device Q3, always output a high-level signal to the fourth switching device Q4, and output pulse signal groups with opposite pulse directions to the first switching device Q1 and the second switching device Q2 respectively.

[0092] S200. In response to detecting that the current parameter is lower than the preset current value, the frequency of the inverter control signal is reduced until the current parameter is equal to the preset current value.

[0093] The fact that the current parameter is equal to the preset current value indicates that the power transmission power of the power transmission circuit meets the preset power transmission requirements.

[0094] Specifically, the control unit can detect the current parameter in the power transmission circuit through the current detection circuit. If the current parameter is less than the preset current value, the control unit can continuously reduce the frequency of the inverter control signal until the current parameter is equal to the preset current value.

[0095] Optionally, the specific value of the preset current value can be a pre-set fixed value.

[0096] S300: In response to the frequency of the inverter control signal meeting the first preset condition threshold, but the current parameter is still detected to be lower than the preset current value, the inverter control signal is output in a second preset manner.

[0097] Specifically, the inverter control signal is output in the second preset mode to control the inverter circuit to convert the AC power in full-bridge mode. The first preset condition threshold can be the resonant frequency of the power transmission circuit.

[0098] Specifically, when the frequency of the inverter control signal reaches the resonant frequency of the power transmission circuit, but the current parameter is still lower than the preset current value, the control unit can output the inverter control signal in a second preset manner to switch the working mode of the inverter circuit from half-bridge mode to full-bridge mode.

[0099] Among them, with Figure 3 Taking the inverter circuit shown as an example, the output of the inverter control signal in the second preset mode can specifically refer to outputting pulse signal groups with opposite pulse directions to the first and fourth switching devices and the second and third switching devices respectively.

[0100] Optionally, when the inverter circuit switches from half-bridge mode to full-bridge mode, the current in the power transmission circuit may suddenly increase. To prevent damage to the power transmission circuit, the control unit can appropriately increase the frequency of the pulse signal before switching the inverter circuit's operating mode. It should be understood that the specific increase in the pulse signal frequency can be determined based on actual conditions, such as the actual input voltage value of the currently connected power supply.

[0101] It should be understood that after the inverter circuit is switched from half-bridge mode to full-bridge mode, if the current parameter is still not equal to the preset current value, the control unit can also adjust the frequency of the AC power converted by the inverter circuit according to the relationship between the current current parameter and the preset current value, so that the current parameter is equal to the preset current value.

[0102] Optionally, based on the relationship between the pulse signal frequency and the impedance of the power transmission circuit, the inverter control signal output by the control unit in step S100 can also be a low-frequency pulse signal. Correspondingly, in step S200, the control unit can gradually increase the frequency of the pulse signal to make the current parameter reach a preset current value.

[0103] Figure 7 This is a schematic diagram of another control method according to an embodiment of the present invention, such as... Figure 7 As shown, the control method is specifically applicable to the control unit in the above embodiments, and the control method may specifically include the following steps:

[0104] S100' outputs a low duty cycle inverter control signal in the first preset mode.

[0105] Specifically, with Figure 6 The control method shown is similar. After the power supply to the power transmitting device is turned on, the control unit can output a low duty cycle inverter control signal in a first preset mode to enable the inverter circuit to start the power transmitting circuit at a lower power.

[0106] Optionally, the specific start-up duty cycle of the inverter control signal can be set and adjusted according to actual conditions.

[0107] S200' In response to detecting that the current parameter is lower than a predetermined current value, the duty cycle of the inverter control signal is increased until the current parameter is equal to the predetermined current value.

[0108] Specifically, if the control unit detects that the current parameter is less than the preset current value, it can increase the duty cycle of the inverter control signal until the current parameter is equal to the preset current value.

[0109] S300': In response to the duty cycle of the inverter control signal satisfying the second preset condition threshold, but still detecting that the current parameter is lower than the predetermined current value, the inverter control signal is output in the second preset manner.

[0110] The second preset condition threshold can be the maximum duty cycle that the inverter control signal can achieve.

[0111] Specifically, if the duty cycle of the inverter control signal is detected to reach the second preset condition threshold, but the current parameter is still lower than the preset current value, the control unit can output the inverter control signal in the second preset manner to switch the working mode of the inverter circuit from half-bridge mode to full-bridge mode.

[0112] It should be understood that, in order to ensure that the power transmission circuit is not damaged, this embodiment can also appropriately reduce the duty cycle of the inverter control signal when switching the operating mode of the inverter circuit, which will not be elaborated here.

[0113] It should be understood that after the inverter circuit is switched from half-bridge mode to full-bridge mode, if the current parameter is still not equal to the preset current value, the control unit can also adjust the duty cycle of the AC power converted by the inverter circuit according to the relationship between the current current parameter and the preset current value, so that the current parameter is equal to the preset current value.

[0114] In one alternative implementation, it is also possible to... Figure 5 and Figure 6 The two control methods shown are combined. That is, after the power transmitting device is powered on, the control unit outputs a low-duty-cycle, high-frequency pulse signal in a first preset mode, and gradually increases the duty cycle and decreases the frequency of the pulse signal until the current parameter meets the preset current value. The adjustment range of the pulse signal's duty cycle and frequency can be determined through continuous testing. It should be understood that the operations of increasing the pulse signal's duty cycle and decreasing the pulse signal's frequency can be performed simultaneously or separately, depending on actual needs.

[0115] The power transmitting device of this invention includes an inverter circuit, a power transmitting circuit, a current detection circuit, and a control unit. The inverter circuit is connected to a DC power supply and converts DC power into AC power. The power transmitting circuit transmits power wirelessly. The current detection circuit detects the current parameters of the power transmitting circuit. The control unit starts the power transmitting circuit at a low power and gradually increases the power until the current parameters reach a preset value. This power transmitting device enables the wireless charger to operate in a wide range of high-voltage input scenarios without affecting charging efficiency or increasing costs.

[0116] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can be modified and varied in various ways. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of protection of the present invention.

Claims

1. An electrical energy transmitting device, characterized in that, The device includes: An inverter circuit, connected to a DC power supply, is used to convert DC power into AC power. An electrical power transmitting circuit, used to transmit electrical energy wirelessly; A current detection circuit is used to detect the current parameters of the energy transmitting circuit; and The control unit is used to start the power transmitting circuit at a low power and gradually increase the power until the current parameter reaches a preset current value; The control unit is specifically used for: Based on the current parameters, an inverter control signal is output to control the operating mode of the inverter circuit and the frequency or duty cycle of the AC power converted by the inverter circuit; The inverter circuit operates in two modes: half-bridge mode and full-bridge mode. The control unit is specifically used for: A high-frequency inverter control signal is output in a first preset mode to control the inverter circuit to convert the AC power in the half-bridge mode. In response to detecting that the current parameter is lower than a preset current value, the frequency of the inverter control signal is reduced until the current parameter is equal to the preset current value.

2. The apparatus according to claim 1, characterized in that, The control unit is also used for: In response to the frequency of the inverter control signal meeting a first preset threshold condition, but the current parameter is still detected to be lower than the preset current value, the inverter control signal is output in a second preset mode to control the inverter circuit to convert the AC power in the full-bridge mode.

3. The apparatus according to claim 1, characterized in that, The inverter circuit operates in two modes: half-bridge mode and full-bridge mode. The control unit is specifically used for: The inverter control signal with a low duty cycle is output in a first preset mode, and the inverter control signal is output in the first preset mode to control the inverter circuit to convert the AC power in the half-bridge mode; In response to detecting that the current parameter is lower than a predetermined current value, the duty cycle of the inverter control signal is increased until the current parameter is equal to the predetermined current value.

4. The apparatus according to claim 3, characterized in that, The control unit is also used for: In response to the duty cycle of the inverter control signal meeting the second preset threshold condition, but the current parameter is still detected to be lower than the predetermined current value, the inverter control signal is output in a second preset manner to control the inverter circuit to convert the AC power in the full-bridge mode.

5. The apparatus according to claim 1, characterized in that, The inverter circuit operates in two modes: half-bridge mode and full-bridge mode. The control unit is specifically used for: A high-frequency, low-duty-cycle inverter control signal is output in a first preset mode. The inverter control signal is output in the first preset mode to control the inverter circuit to convert the AC power in the half-bridge mode. In response to detecting that the current parameter is lower than a predetermined current value, the duty cycle of the inverter control signal is increased and / or the frequency of the inverter control signal is decreased until the current parameter is equal to the predetermined current value; In response to the inverter control signal's duty cycle satisfying a second preset threshold and the inverter control signal's frequency satisfying a first preset threshold, but the current parameter is still detected to be lower than the predetermined current value, the inverter control signal is output in a second preset manner. The inverter control signal output in the second preset manner is used to control the inverter circuit to convert the AC power in the full-bridge mode.

6. The apparatus according to claim 1, characterized in that, The power transmitting circuit includes: An electrical energy transmitting coil is used to transmit electrical energy wirelessly. A compensation capacitor is used to connect in series with the power transmitting coil to form the power transmitting circuit.

7. The apparatus according to claim 1, characterized in that, The current detection circuit includes a diode, a first resistor, a capacitor, and a second resistor connected in parallel with the capacitor, connected in series.

8. The apparatus according to claim 1, characterized in that, The device does not have a step-down circuit.

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