Power-saving charging device

Abstract

The power-saving charging device of the present application controls the primary side controller and the secondary side controller to be in the shutdown state when the output end is not connected with a load. When the output end is switched to the state of being connected with a load, the secondary side controller receives a startup power from a power storage unit, performs a startup procedure and enters the working state, and the primary side controller receives a startup power signal from the power storage unit and performs a startup procedure according to the startup power signal and enters the working state. Accordingly, the charging device can enter the standby state of extremely low power consumption when no load is connected, i.e. the primary side controller and the secondary side controller are in the shutdown state, thereby achieving the effect of saving the power consumption of the controllers when the charging device is in standby.

Description

Technical Field

[0001] This invention relates to a charging device, and more particularly to a power-saving charging device. Background Technology

[0002] In recent years, the use of various portable electronic devices has become increasingly common. People often carry multiple electronic devices such as mobile phones, tablets, and Bluetooth headsets, and therefore usually place charging devices in different living spaces, such as bedrooms, living rooms, or offices, for convenient charging. According to most people's habits, when they finish charging in these different places or need to leave, since other places already have charging devices, they often don't unplug the charging device from the socket, but leave it plugged in. In this situation, the output terminal of the charging device is not connected to a load device (i.e., the electronic device), and the charging device has no power output; this is generally called the charging device's "standby state." In standby state, the transformer in the charging device usually continuously receives power from the socket to maintain the operation of the circuit controller in the charging device, so that it can start when the output terminal is connected to a load device. Therefore, the continuous consumption of power in standby state leads to energy waste.

[0003] Chinese invention patent CN111669065A discloses a method for reducing the standby power of a charging device. After the charging device has been unconnected to a load for a period of time, the transformer reduces the output voltage to a preset limit to maintain the processor IC's standby operation mode. When the charging device detects a connected load, it exits the standby mode. While this method reduces standby power consumption, the transformer still needs to provide power to the processor IC for standby operation, thus limiting the effectiveness of reducing power loss.

[0004] US Patent Publication No. US8242359B2 discloses a power-saving adapter / charging device that uses a physical switch installed at the output port of the charging device. This physical switch directly controls the power supply's on / off state, feeding back the current output current via a sensing resistor at the output terminal. When the current is low or zero, a signal is transmitted to the main controller via an optocoupler to shut it down. When a load device is reconnected to the charging device's output terminal, the physical switch must be manually turned on. While this patented method minimizes standby power consumption by turning off the main controller, it is difficult to implement, requiring an additional physical switch, and manual restarting does not meet the need for ease of use. Furthermore, the physical switch's installation between the mains power and the charging device's output terminal raises safety regulations and isolation distance considerations. Summary of the Invention

[0005] In view of the fact that existing charging devices still generate power loss when no load device is connected, resulting in deficiencies in existing technologies for reducing standby power loss of charging devices, this invention proposes a power-saving charging device, comprising: A transformer includes a primary winding and a secondary winding; An output switch with a control terminal; A primary-side circuit is electrically connected between the two input terminals and the primary-side winding; The primary and secondary circuits are electrically connected to the secondary winding and connected to an output terminal via the output switch. A primary-side controller is electrically connected to the primary-side circuit; The primary and secondary side controllers are electrically connected to an energy storage unit, the control terminal of the output switch, and the primary side controller; wherein... When the output terminal is in an unconnected state, both the primary side controller and the secondary side controller are in a powered-off state; When the output terminal switches from the disconnected state to the connected state, the energy storage unit provides a power-on power supply to the secondary controller, enabling the secondary controller to perform a power-on procedure and enter a working state; the primary controller receives a power-on power signal from the energy storage unit, and performs a power-on procedure according to the power-on power signal and enters a working state.

[0006] Another power-saving charging device proposed in this invention comprises: A transformer includes a primary winding and a secondary winding; An output switch with a control terminal; A primary-side circuit is electrically connected between the two input terminals and the primary-side winding; The primary and secondary circuits are electrically connected to the secondary winding and connected to an output terminal via the output switch. A primary-side controller is electrically connected to the primary-side circuit; The primary and secondary side controllers are electrically connected to an energy storage unit, the control terminal of the output switch, and the primary side controller. A power isolation unit, through which the secondary-side controller is electrically connected to the primary-side controller; and A feedback isolation unit is provided, through which the secondary controller is connected to the primary controller and transmits feedback control signals; When the output terminal is in an unconnected state, both the primary controller and the secondary controller are in a power-off state. When the output terminal switches from the unconnected state to the connected state, the energy storage unit provides a power supply to the secondary controller, enabling the secondary controller to perform the power-on procedure and enter a working state. The secondary controller generates the power-on signal through the power isolation unit and provides the power-on signal to the primary controller. The primary controller then performs the power-on procedure and enters the working state based on the power-on signal.

[0007] In the power-saving charging device of the present invention (hereinafter referred to as the charging device), when the output terminal is in an unconnected state, that is, in the standby state where no load device is connected to the output terminal of the charging device, both the primary-side controller and the secondary-side controller are in a powered-off state, so that the power loss of the charging device in the standby state is reduced to an extremely low near-zero power consumption state. When the charging device switches from the unconnected state to the connected state, that is, when a load device is connected to the output terminal, the energy storage unit provides power to the secondary-side controller, causing the secondary-side controller to start the power-on procedure and enter the working state. The energy storage unit further provides the power-on signal to the primary-side controller, causing the primary-side controller to enter the power-on procedure. After the primary-side controller enters the power-on procedure, it can generate an initial control signal to start the primary-side circuit, which transmits the input power received from the input terminal to the transformer, so that the transformer starts to convert electrical energy and provides the voltage required for the primary-side controller and the secondary-side controller to work normally, thereby causing the charging device to enter the normal working state from the original standby state.

[0008] The charging device of the present invention effectively reduces internal power consumption in standby mode, and the process from standby mode to connection of load device and entry into normal working mode can be performed completely autonomously without manual operation, solving the shortcomings of existing charging devices that cannot further reduce power consumption in standby mode and are inconvenient to use. Attached Figure Description

[0009] Figure 1 This is a circuit block diagram of the power-saving charging device of the present invention.

[0010] Figure 2 This is a schematic diagram of the control process executed by the power-saving charging device of the present invention.

[0011] Figure 3 This is another schematic diagram of the control process executed by the power-saving charging device of the present invention.

[0012] Figure 4 This is a circuit block diagram of the first embodiment of the power-saving charging device of the present invention.

[0013] Figure 5 This is a circuit block diagram of the second embodiment of the power-saving charging device of the present invention.

[0014] Figure 6This is a circuit block diagram of the third embodiment of the power-saving charging device of the present invention;

[0015] Figure 7 This is a circuit block diagram of the fourth embodiment of the power-saving charging device of the present invention. Detailed Implementation

[0016] Please see Figure 1 As shown, the power-saving charging device of the present invention (hereinafter referred to as charging device 10) includes two input terminals IN1 and IN2 and an output terminal Vout, a transformer T, an output switch Qout, a primary side circuit 11, a secondary side circuit 12, a primary side controller 13, and a secondary side controller 14. The two input terminals IN1 and IN2 are used to connect to an input power supply. The transformer T includes a primary side winding N1 and a secondary side winding N2 that are coupled to each other. The power input terminal and the power output terminal of the primary side circuit 11 are electrically connected to the two input terminals IN1 and IN2 and the primary side winding N1, respectively, and are controlled by the primary side controller 13 to transmit the input power supply to the primary side winding N1. The primary side controller 13 is, for example, a pulse width modulation (PWM) processor. The power input terminal of the secondary-side circuit 12 is electrically connected to the secondary-side winding N2, and the power output terminal of the secondary-side circuit 12 is connected to the output terminal Vout through the output switch Qout, so that the voltage generated by the secondary-side winding N2 of the transformer T is transmitted to the output terminal Vout through the output switch Qout. The primary-side controller 13 is electrically connected to the primary-side circuit 11 to control the primary-side circuit 11. The secondary-side controller 14 is electrically connected to a connection node p1 between the secondary-side circuit 12 and the output switch Qout, the control terminal of the output switch Qout, and the primary-side controller 13. The secondary-side controller 14 controls the on / off state of the output switch Qout and controls the primary-side controller 13 according to the voltage feedback from the connection node p1. Preferably, the output switch Qout is, for example, an NMOS (N-Type Metal-oxide semiconductor) transistor.

[0017] Preferably, the transformer T further includes an auxiliary winding Na, coupled to either the primary winding N1 or the secondary winding N2. When the primary controller 13 is in operation, the primary circuit 11 operates normally and transmits input power to the primary winding N1. The auxiliary winding Na, converted by the transformer T, generates a working voltage to supply to the primary controller 13 to maintain its operation. The secondary circuit 12, converted by the transformer T, generates an output voltage to supply to the secondary winding N2, and this voltage is then supplied to the output terminal Vout via the secondary circuit 12 and the output switch Qout. The secondary controller 14 receives this output voltage from the output terminal Vout to maintain its operation. At this time, a load device 20 is connected to the output terminal Vout (see [reference needed]). Figures 4 to 7 For example, any electronic device to be charged, the load device 20 normally receives the output voltage from the output terminal Vout for charging, that is, the charging device 10 generally provides the output voltage to the load device 20 for normal operation.

[0018] The load device 20 includes, for example, a load battery 21, a load switch 22, and a power supply coordination unit 23.

[0019] In operation, the secondary-side controller 14 not only obtains operating power from the output terminal Vout, but also detects the load connection status of the output terminal Vout. More specifically, the charging device 10 further includes a communication terminal CC, which is used to connect with the power supply coordination unit 23 of the load device 20 to communicate charging-related information. The secondary-side controller 14 detects the signal status of the communication terminal CC to determine the load connection status of the output terminal Vout. When the load device 20 is removed from the output terminal Vout of the charging device 10, the connection between the secondary-side controller 14 and the load device 20 is interrupted. When the secondary-side controller 14 determines that the load connection status of the output terminal Vout is disconnected, the secondary-side controller 14 generates and transmits a shutdown signal to the primary-side controller 13, causing the primary-side controller 13 to enter a shutdown state. After the primary-side controller 13 enters the shutdown state, the primary-side circuit 11 also stops working and interrupts the input power supplied to the primary-side winding N1, causing the output voltage generated by the secondary-side winding N2 to drop. After sending a power-off signal, the secondary controller 14 also enters a power-off state, causing the charging device 10 to enter a standby state where both the primary controller 13 and the secondary controller 14 are powered off.

[0020] When the output terminal Vout switches from the unconnected state to the connected state, that is, when a load device 20 is connected to the output terminal Vout of the charging device 10, and a power storage unit 17 provides a power-on power supply to the secondary side controller 14, the secondary side controller 14 performs a power-on procedure and enters a working state; when the primary side controller 13 receives the power-on power supply signal from the power storage unit 17, the primary side controller 13 performs a power-on procedure, causing the primary side circuit 11 to start working and enter the working state.

[0021] Please refer to the following: Figure 2 As shown, the charging device of the present invention mainly performs the following control steps:

[0022] When the load connection status of the output terminal Vout is not connected (S101), the primary side controller 13 and the secondary side controller 14 are both controlled to be in the off state (S102).

[0023] When the output terminal Vout switches from the unconnected state to the connected state, and the energy storage unit 17 provides the power-on power to the secondary side controller 14, the secondary side controller 14 performs the power-on procedure and enters the working state (S103).

[0024] The primary side controller 13 receives a power-on signal from the energy storage unit 17, and performs a power-on procedure and enters the working state according to the power-on signal (S104).

[0025] For a better option, please refer to Figure 3 As shown, steps S101-S102 include the following sub-steps:

[0026] When the secondary controller 14 is in operation, the secondary controller 14 determines whether the output terminal Vout is in a disconnected state by detecting the state of the communication terminal CC (S1011).

[0027] If so, proceed to step S102, which includes the following sub-steps:

[0028] The secondary controller 14 sends a shutdown signal to the primary controller 12, causing the primary controller to enter the shutdown state (S1021).

[0029] The secondary controller 14 enters the shutdown state (S1022).

[0030] Conversely, if the secondary controller 14 determines that the output terminal Vout is not in an unconnected state, that is, the output terminal Vout is connected to the load device 20, the secondary controller 14 will maintain normal operation in coordination with the primary controller 12 (S1012), and the charging device 10 will maintain normal power supply.

[0031] Please see again Figure 1 As shown, preferably, the charging device 10 further includes a feedback isolation unit 15. The secondary-side controller 14 is signal-connected to the primary-side controller 13 through the feedback isolation unit 15. The feedback isolation unit 15 is, for example, an optocoupler, and the secondary-side controller 14 is connected to the feedback isolation unit 15 through a compensation unit 151. In operation, the secondary-side controller 14 transmits a feedback control signal to the primary-side controller 13 through the feedback isolation unit 15 according to the voltage of the connection node p1, so as to coordinate the control of the operation of the primary-side circuit 11.

[0032] The present invention provides four embodiments of the energy storage unit 17. The following provides a more detailed description of the configuration of the energy storage unit 17 and the method of providing power-on power and power-on signal for the energy storage unit 17.

[0033] Please see Figure 4 As shown, in a first embodiment of the present invention, the charging device 10 further includes the energy storage unit 17. Preferably, the energy storage unit 17 includes a switch 171, a battery 172, and a control unit 173. The battery 172 is electrically connected to the secondary-side controller via the switch 171, and the control unit 173 is electrically connected to the battery 172 to maintain operation using the power of the battery 172, and is electrically connected to a control terminal of the switch 171 to control the switch 171. Preferably, the battery 172 is connected to the connection node p1, so the secondary-side controller 14 receives the power supply provided by the energy storage unit 17 through the connection node p1.

[0034] In other words, the energy storage unit 17 is located inside the charging device 10 and is used to store and provide the power-on power required by the secondary controller 14 and the power-on signal required by the primary controller 13. The control unit 173 of the energy storage unit 17 is electrically connected to the secondary controller 14 and detects a communication start signal received by the secondary controller 14 from the communication terminal CC. When the output terminal Vout switches from the unconnected state to the connected state, that is, when the load device 20 is connected to the output terminal Vout and the communication terminal CC, the control unit 173 detects the communication start signal, thereby controlling the switch 171 to switch from off to on, so that the battery 172 outputs power to the secondary controller 14. Accordingly, the energy storage unit 17 provides the power-on power to the secondary controller 14 according to the communication start signal, and the secondary controller 14 performs the power-on procedure and enters the working state.

[0035] Once the secondary-side controller 14 is powered on using the power supply from the energy storage unit 17, it enters the operating state. The secondary-side controller 14 then generates a power-on signal through a power isolation unit 16 and provides it to the primary-side controller 13. The primary-side controller 13 receives the power-on signal, obtains power based on it, and performs the power-on procedure, causing the primary-side circuit 11 to start operating. Only then does the primary-side controller 13 fully enter the operating state. The power isolation unit 16 is, for example, an optocoupler.

[0036] Due to the electrical isolation between the primary circuit 11 and the secondary circuit 12, the power supply for the energy storage unit 17 cannot be directly supplied to the primary controller 13, but must be supplied to the primary controller 13 through the power isolation unit 16. The power supply signal generated by the power isolation unit 16 initiates the power-on procedure of the primary controller 13. The primary controller 13 generates an initial control signal for the primary circuit 11, and the primary circuit 11 starts working and transmits the input power to the primary winding N1 of the transformer T. Once the voltage on the transformer T begins to build up, the primary controller 13 can obtain the power supply required to complete the power-on procedure from the auxiliary winding Na of the transformer T and enter normal operating mode.

[0037] At this point, the startup procedures for both the primary-side controller 13 and the secondary-side controller 14 have been completed. When the secondary-side controller 14 determines, based on the voltage at the connection node p1, that both the primary-side controller 13 and the primary-side circuit 11 are functioning normally and can provide output voltage at the output terminal Vout, the secondary-side controller 14 can further communicate with the power supply coordination unit 23 of the load device 20 to coordinate power supply. After completing the power supply coordination communication, it controls the output switch Qout to turn on, outputting electrical energy to the load device 20 through the output terminal Vout, and the charging device 10 enters a normal power supply state.

[0038] Please see Figure 5 As shown, in a second embodiment of the present invention, similar to the first embodiment, the charging device 10 includes the energy storage unit 17. The energy storage unit 17 is electrically connected to the connection node p1, and the secondary-side controller 14 is connected to the connection node p1 to connect to the energy storage unit 17 and receive the power-on power.

[0039] In this embodiment, the transformer T is a bidirectional transformer T, that is, the secondary circuit 12 enables the transformer T to also receive power input from the secondary winding N2, and after conversion by the transformer T, the auxiliary winding Na generates voltage output.

[0040] When the output terminal Vout is connected to the load device 20, the control unit 173 of the energy storage unit 17 detects the communication start signal received from the communication terminal CC by the secondary side controller 14, and controls the switch 171 to switch on, so that the battery 172 provides the power-on power to the connection node p1. The secondary side controller 14 receives the power-on power from the connection node p1, enters the working state, and controls the secondary side circuit 12 to work, so that the power-on power on the connection node p is transmitted to the secondary winding N2 of the transformer T through the secondary side circuit 12. The transformer T generates the power-on signal in the auxiliary winding Na, and the primary side circuit 11 receives the power-on signal from the auxiliary winding Na.

[0041] Preferably, the secondary winding N2 includes a first terminal and a second terminal, and the secondary circuit 12 includes a synchronous rectifier switch SR, a synchronous rectifier controller 121, and a filter capacitor C. The first terminal of the secondary winding N2 is connected to the output terminal Vout through the output switch Qout, and the second terminal is connected to an output return terminal RTN of the charging device 10 through the synchronous rectifier switch SR; the filter capacitor C is connected in parallel between the first terminal and the output return terminal RTN. The synchronous rectifier controller 121 is electrically connected to the control terminal of the synchronous rectifier switch SR and the secondary controller 14. When the secondary controller 14 enters the working state, it sends a power signal to the synchronous rectifier controller 121, which controls the synchronous rectifier switch SR, so that the secondary circuit 12 transmits the power supply to the secondary winding N2 of the transformer T.

[0042] After receiving the power-on signal from the auxiliary winding Na, the primary side controller 13 enters the power-on procedure.

[0043] When the primary-side controller 13 receives the power-on signal and enables the primary-side circuit 11 to operate, the secondary-side controller 14 stops sending the enable signal to the synchronous rectifier controller 121, causing the secondary-side circuit 12 to stop operating. The voltage of the power-on signal at the output terminal of the auxiliary winding Na is briefly maintained by the capacitor Ca until the operation of the primary-side circuit 11 establishes the output voltage of the secondary-side winding N2 at the connection node p1 and the output terminal of the auxiliary winding Na. When the voltage at the connection node p1 begins to rise, the secondary-side controller 14 determines that the primary-side controller 13 has entered the working state and the primary-side circuit 11 has started to operate normally. Then, the secondary-side controller 14 controls the energy storage unit 17 to stop providing power-on through the control unit 173, and the charging device 10 enters the normal power supply state. In this embodiment, the power-on signal received by the primary-side controller 13 from the energy storage unit 17 and the power-on established after the primary-side circuit 11 starts to operate are both provided through the auxiliary winding Na.

[0044] In the first and second embodiments, preferably, when the charging device 10 is in standby mode, that is, when both the primary-side controller 13 and the secondary-side controller 14 are off, the control unit 173 further detects the stored capacity of the battery 172. When the control unit 173 determines that the stored capacity of the battery 172 has dropped to a lower limit, the control unit 173 actively triggers the switch 171 to switch on, supplying power to the secondary-side controller 14, causing the secondary-side controller 14 and the primary-side controller 13 to enter the power-on procedure. After the secondary-side controller 14 and the primary-side controller 13 enter the working state, the battery 172 of the energy storage unit receives power from the secondary-side circuit 12 through the connection node p1 and is charged. The secondary-side controller 14 again determines that the output terminal Vout is in an unconnected state, and the secondary-side controller 14 again causes the primary-side controller 13 and itself to enter the off state, and the charging device 10 returns to the standby state. Accordingly, the charging device 10 ensures that the internal energy storage unit 17 stores enough electrical energy to power the primary controller 13 and the secondary controller 14, and that the charging device 10 remains in a standby state with extremely low power consumption most of the time.

[0045] Please see Figure 6 As shown, in a third embodiment of the present invention, the energy storage unit 17 is a load battery 21 within the load device 20, that is, the load battery 21 that should be charged by the charging device 10. In this embodiment, the charging device 10 further includes the power isolation unit 16, and the secondary-side controller 14 is electrically connected to the primary-side controller 13 through the power isolation unit 16 to provide a power-on signal.

[0046] The load device 20 includes the load battery 21, a load switch 22 and a power supply coordination unit 23.

[0047] When the output terminal Vout switches from the disconnected state to the connected state, that is, when the load device 20 is connected to the output terminal Vout, and the power supply coordination unit 23 of the load device 20 detects the secondary-side controller 14 through the communication terminal CC, the load device 20 controls the load switch 22 to turn on, so that the load battery 21 provides the power-on power to the output terminal Vout. The secondary-side controller 14 receives the power-on power through the output switch Qout via the connection node p1. After receiving the power-on power, the secondary-side controller 14 generates the power-on power signal through the power isolation unit 16 and provides it to the primary-side controller 13.

[0048] In this embodiment, the power supply is provided in reverse from the output terminal Vout by the load device 20 to the secondary-side controller 14. When the output switch Qout is in the off state, i.e., the voltage at the gate control terminal is lower than the gate threshold and a reverse voltage is received from the source, the output switch Qout can be regarded as acting as an equivalent diode. Therefore, when the load battery 21 in the load device 20 is supplied with the power supply from the output terminal Vout, the power supply is transmitted to the connection node p1 through the equivalent diode of the output switch Qout.

[0049] After receiving the power-on power, the secondary-side controller 14, similar to the first embodiment of the present invention, performs a power-on procedure. The secondary-side controller 14 generates a power-on power signal through the power isolation unit 16 and provides it to the primary-side controller 13. The operation of the primary-side controller 13 after entering the power-on procedure is the same as in the first or second embodiment, and will not be repeated here.

[0050] Please see Figure 7 As shown, in a fourth embodiment of the present invention, the energy storage unit 17 is the load battery 21 within the load device 20, that is, the load battery 21 that should be charged by the charging device 10, and the transformer T is the bidirectional transformer T. In this embodiment, the power supply provided by the load battery 21 to the output terminal Vout is provided to the connection node p1 via the equivalent diode of the output switch Qout, and after the secondary side controller 14 enters the working state, similar to the second embodiment, the secondary side controller 14 controls the secondary side circuit 12 to transmit the power supply to the secondary side winding N2. After the power supply is converted by the transformer T, the auxiliary winding Na generates the power supply signal. The primary side controller 13 receives the power supply signal from the auxiliary winding Na to perform the power-on procedure.

[0051] The operation of the primary-side controller 13 after entering the power-on program is the same as in the first or second embodiment, and will not be repeated here. In this embodiment, the power-on signal received by the primary-side controller 13 from the load battery 21 and the power-on power established after the primary-side circuit 11 starts working are both provided by the auxiliary winding Na.

[0052] Preferably, in the third and fourth embodiments, the secondary-side controller 14 is electrically connected to the communication terminal CC and includes a power supply coordination unit 141. The power supply coordination unit 141 communicates with the power supply coordination unit 23 of the load device 20 through the communication terminal CC. More specifically, when the load device 20 is connected to the output terminal Vout, the power supply coordination unit 141 of the secondary-side controller 14 is simultaneously connected to the power supply coordination unit 23 of the load device 20 through the communication terminal CC. Since the secondary-side controller 14 is still in the off state, the power supply coordination unit 23 of the load device 20 detects that the communication terminal CC is at a low potential. Therefore, the power supply coordination unit 141 controls the load battery 21 to provide a basic power supply, such as a 5V / 1A power supply, to the charging device 10. After the secondary controller 14 completes the power-on procedure using the power supply, the power supply coordination unit 141 of the secondary controller 14 can further communicate with the power supply coordination unit 23 of the load device 20. When the power supply coordination unit 141 of the charging device 10 receives a power supply information from the load device 20, the power supply coordination unit 141 generates a power supply request for the power supply, so that after receiving the power supply request, the load device 20 can control and adjust the power supply of the load battery 21, and further provide the specified power supply to the output terminal Vout.

[0053] In the third and fourth embodiments, since power is to be supplied from the load device 20 to the charging device 10 in reverse, the power supply coordination unit 141 of the secondary-side controller 14 of the charging device 10 sets a device identity to a load identity before entering the shutdown state. Thus, when the load device 20 is connected to the output terminal Vout, and the power supply coordination unit 141 is connected to the load device 20 via the communication terminal CC, and the secondary-side controller 14 enters the power-on procedure, the power supply coordination unit 141 in the load device 20 will initiate initial communication with the power supply coordination unit 141 of the secondary-side controller 14 that has the load identity.

[0054] Furthermore, after the secondary-side controller 14 and the primary-side controller 13 execute the power-on procedure from the power-off state and enter the working state, the power supply coordination unit 141 of the secondary-side controller 14 of the charging device 10 further sets the device's identity status to a power supply identity and provides relevant signals to the communication terminal CC. When the load device 20 determines through the communication terminal CC that the charging device 10 has switched to a power supply identity, the load device 20 switches to a load identity according to the communication protocol, stops providing the power-on power to the output terminal Vout of the charging device 10, and waits for the output voltage provided by the charging device 10 after it enters the normal power supply state.

[0055] Preferably, the power supply coordination unit 141 of the secondary side controller 14 is a processing unit that conforms to the Universal Serial Bus (USB) Power Delivery (PD) protocol.

[0056] In summary, the energy storage unit 17 in this invention can be positioned in two ways: as an energy storage unit located inside the charging device, or using the load battery of the load device as an energy storage unit. The power-on power supply and power-on signal transmission paths can be implemented through an additional power isolation unit or by using a bidirectional transformer to transmit the power-on signal in reverse. The placement of the energy storage unit can be combined with the power-on signal transmission path to produce at least four implementation states as described in the first to fourth embodiments. In the first and second embodiments, in the standby state where the charging device 10 is not connected to the load device 20, only the battery 172 of the energy storage unit 17 needs to maintain the operation of the simple control unit 143. The primary controller 13 and the secondary controller 14 are mostly in a powered-off state, thereby avoiding the power consumption of maintaining the more complex primary controller 13 and secondary controller 14 continuously operating for extended periods in the standby state. In the third and fourth embodiments, the load battery 22 in the load device 20 is used to reverse power the charging device 10 to supply power to the primary side controller 13 and the secondary side controller 14. Therefore, when the load device 20 is not connected, the primary side controller 13 and the secondary side controller 14 remain in a powered-off state, which also achieves the purpose of avoiding the continuous operation and power consumption of the primary side controller 13 and the secondary side controller 14 for a long time in the standby state.

[0057] The above description is merely an embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above by way of embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A power-saving charging device, characterized in that, Includes: A transformer includes a primary winding and a secondary winding; An output switch with a control terminal; A primary-side circuit is electrically connected between the two input terminals and the primary-side winding; The primary and secondary circuits are electrically connected to the secondary winding and connected to an output terminal through the output switch. The circuits also include a synchronous rectifier switch, a synchronous rectifier controller, and a filter capacitor. A primary-side controller is electrically connected to the primary-side circuit; as well as The primary and secondary side controllers are electrically connected to an energy storage unit, the control terminal of the output switch, and the primary side controller; wherein... When the output terminal is in an unconnected state, both the primary side controller and the secondary side controller are in a powered-off state; When the output terminal switches from the disconnected state to the connected state, the energy storage unit provides a power-on power supply to the secondary controller, enabling the secondary controller to perform the power-on procedure and enter a working state; the primary controller receives a power-on power signal from the energy storage unit, and performs the power-on procedure according to the power-on power signal and enters a working state. The secondary winding includes a first end and a second end. The first end is connected to the output end through the output switch, and the second end is connected to the output return end of the power-saving charging device through the synchronous rectifier switch. The filter capacitor is connected in parallel between the first terminal and the output return terminal, and the synchronous rectifier controller is electrically connected to a control terminal of the synchronous rectifier switch and the secondary side controller. When the secondary side controller enters the working state, it transmits a consistent energy signal to the synchronous rectifier controller, which controls the synchronous rectifier switch so that the secondary side circuit transmits the power supply to the secondary winding of the transformer. The transformer is a bidirectional transformer and further includes an auxiliary winding. The auxiliary winding is electrically connected to the primary side controller. The primary side controller receives the power-on signal from the auxiliary winding and then enters the power-on procedure. Specifically, when the primary-side controller receives the power-on signal and enables the primary-side circuit to operate, the secondary-side controller stops sending the enable signal to the synchronous rectifier controller, causing the secondary-side circuit to stop operating.

2. The power-saving charging device as described in claim 1, characterized in that, It further includes a communication terminal, to which the secondary-side controller is electrically connected, wherein, When the secondary controller is in this working state, the secondary controller determines the load connection status of the output terminal based on the status of the communication terminal; When the secondary controller determines that the load connection status is disconnected, the secondary controller generates and sends a shutdown signal to the primary controller, causing the primary controller to enter the shutdown state, and the secondary controller also enters the shutdown state.

3. The power-saving charging device as described in claim 1, characterized in that, The device further includes a communication terminal, the secondary-side controller being electrically connected to the communication terminal, and the power-saving charging device further includes: The energy storage unit includes: One switch; A battery is electrically connected to a connection node of the output switch via the switch, which connects the secondary circuit to the secondary circuit. A control unit is electrically connected to the battery, a control terminal of the switch, and the secondary-side controller; wherein, when the output terminal switches from the disconnected state to the connected state, the output terminal and the communication terminal are connected to a load device, the control unit detects a communication start signal received by the secondary-side controller from the communication terminal, and the control unit controls the switch to turn on, so that the battery provides the power-on power to the connection node; and A power isolation unit, through which the secondary-side controller is electrically connected to the primary-side controller; The secondary controller is electrically connected to the connection node to receive the power-on power, perform the power-on procedure and enter the working state. The secondary controller generates the power-on power signal through the power isolation unit to provide the power-on power signal to the primary controller.

4. The power-saving charging device as described in claim 1, characterized in that, Further includes: A communication terminal, the secondary side controller is electrically connected to the communication terminal; The energy storage unit includes: One switch; A battery, electrically connected to a connection node of the output switch via the switch, and... A control unit electrically connected to the battery, a control terminal of the switch, and the secondary controller; When the output terminal switches from the disconnected state to the connected state, the output terminal and the communication terminal are connected to a load device. The control unit detects a communication start signal received by the secondary controller from the communication terminal. The control unit controls the switch to turn on, so that the battery provides the power to the connection node. The secondary-side controller is electrically connected to the connection node to receive the power-on power, perform the power-on procedure and enter the working state, and control the operation of the secondary-side circuit so that the power-on power is transmitted to the transformer through the secondary-side circuit and the power-on power signal is generated in the auxiliary winding. The primary circuit receives the power-on signal from the auxiliary winding.

5. The power-saving charging device as described in claim 3 or 4, characterized in that, When both the primary controller and the secondary controller are in the off state, the control unit detects the battery's stored capacity; when the control unit determines that the battery's stored capacity is lower than a lower limit value, the control unit controls the switch to turn on to supply power to the secondary controller, causing the secondary controller and the primary controller to enter the power-on procedure. When the secondary-side controller and the primary-side controller enter the working state, the battery of the energy storage unit receives electrical energy provided by the secondary-side circuit and is charged by the connection node.

6. The power-saving charging device as described in claim 1, characterized in that, The energy storage unit is a load battery of a load device; the energy-saving charging device further includes: A power isolation unit, through which the secondary-side controller is electrically connected to the primary-side controller; When the output terminal switches from the disconnected state to the connected state, the load device is connected to the output terminal, and the load device causes the load battery to provide the power-on power to the output terminal. The secondary side controller receives the power-on power through the output switch via a connection node of the output switch. After receiving the power-on power, the secondary controller generates a power-on power signal through the power isolation unit and provides the power-on power signal to the primary controller.

7. The power-saving charging device as described in claim 1, characterized in that, The energy storage unit is a load battery within a load device; wherein... When the output terminal switches from the disconnected state to the connected state, the load device is connected to the output terminal, and the load device causes the load battery to provide the power-on power to the output terminal. The secondary-side controller receives the power-on power from the output terminal, performs the power-on procedure and enters the working state, and controls the operation of the secondary-side circuit so that the power-on power generates the power-on power signal in the auxiliary winding through the transformer. The primary circuit receives the power-on signal from the auxiliary winding.

8. The power-saving charging device as described in claim 6 or 7, characterized in that, It further includes a communication terminal; The secondary-side controller includes a power supply coordination unit; When the output terminal switches from the disconnected state to the connected state, the load device is connected to the output terminal, and the power supply coordination unit of the secondary side controller is simultaneously connected to the load device through the communication terminal. When the load device provides power to start up according to the status of the communication terminal, and the secondary controller performs the power-on procedure, the power supply coordination unit of the secondary controller further sends a power supply request for the power-on power supply to the load device based on the power supply information of the load device received from the communication terminal.

9. The power-saving charging device as described in claim 8, characterized in that, Before entering the shutdown state, the power supply coordination unit sets the device identity status to a load identity. When the secondary controller and the primary controller execute the power-on procedure from the power-off state and enter the working state, the power supply coordination unit sets the device identity status to a power supply identity.

10. A power-saving charging device, characterized in that, Includes: A transformer includes a primary winding and a secondary winding; An output switch with a control terminal; A primary-side circuit is electrically connected between the two input terminals and the primary-side winding; The primary and secondary circuits are electrically connected to the secondary winding and connected to an output terminal via the output switch. A primary-side controller is electrically connected to the primary-side circuit; The primary and secondary side controllers are electrically connected to an energy storage unit, the control terminal of the output switch, and the primary side controller. A power isolation unit, through which the secondary-side controller is electrically connected to the primary-side controller; as well as A feedback isolation unit is provided, through which the secondary controller is connected to the primary controller and transmits feedback control signals; When the output terminal is in an unconnected state, both the primary controller and the secondary controller are in a power-off state. When the output terminal switches from the unconnected state to the connected state, the energy storage unit provides a power supply to the secondary controller, enabling the secondary controller to perform the power-on procedure and enter a working state. The secondary controller generates the power-on signal through the power isolation unit and provides the power-on signal to the primary controller. The primary controller then performs the power-on procedure and enters the working state based on the power-on signal.

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