Power supply system and control method thereof
By introducing a control module into the wireless power supply system, the output switch is controlled according to the voltage of the output capacitor and the set voltage threshold value, and the matching of the input power and load power in the wireless power supply system is solved, and the adaptability and start-up difficulty of the system are improved.
Patent Information
- Application Number
- CN202510106596.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2025-05-02
AI Technical Summary
In wireless power supply systems, due to the low bandwidth of wireless communication, it is difficult to quickly match the input power and the load power, which in turn makes the capacitance voltage lower by the load, making it difficult to start the machine, especially the more difficult the load restarts, resulting in poor system adaptability.
By introducing a control module into the power supply system, the conduction and shutdown of the output switch are controlled according to the voltage of the output capacitor and the set first voltage threshold and the second voltage threshold, so as to realize the charging and discharging control of the output capacitor until the input power matches the load power.
It effectively reduces the difficulty of successfully starting the power supply system, improves the adaptability of the system, and enables the input power to quickly match the load power to ensure the stability of the capacitor voltage.
Smart Images
Figure CN119921565A_ABST
Abstract
Description
Technical Field
[0001] This case relates to the field of electric energy conversion, and in particular to a power supply system and a control method thereof. Background Art
[0002] During wireless power supply or wireless charging, power is transmitted from the transmitter to the receiver through magnetic field coupling, and the receiver measures voltage, current and other information for closed-loop control. Since the measured voltage, current and other information need to be sent from the receiver to the transmitter through wireless communication to achieve closed-loop control, and the transmission bandwidth of wireless communication is low (only dozens of data frames can be transmitted per second), this leads to a low bandwidth for the entire system. In addition, since no additional DC / DC circuit is added to the receiver, the output capacitor cannot be too large. When a heavier load is connected to the output, due to the lower control bandwidth, the power sent by the transmitter after the output switch is turned on cannot quickly match the load power, and the capacitor voltage will be pulled down by the load, making it difficult to start the machine. Moreover, the heavier the load, the more difficult it is to restart the machine, making the wireless power supply system less adaptable.
[0003] Therefore, it is necessary to develop a power supply system and a control method thereof to solve the problems faced by the prior art. Summary of the invention
[0004] The purpose of this case is to provide a power supply system and a control method thereof, which controls the on and off of the output switch according to the voltage of the output capacitor and the first voltage threshold and the second voltage threshold, thereby realizing the charge and discharge control of the output capacitor until the input power and the load power are matched, thereby reducing the difficulty of successfully starting the power supply system and improving the adaptability of the power supply system.
[0005] To achieve the above-mentioned purpose, the present case provides a power supply system, comprising an input module, an output module and a control module. The input module is used to provide input power. The output module is electrically connected to the input module, and comprises an output capacitor, an output switch and a load, wherein the output capacitor is electrically connected to the input module, the output switch is electrically connected between the first end of the output capacitor and the first end of the load, and the second end of the load is electrically connected to the second end of the output capacitor. The control module is electrically connected to the input module and the output module, and is configured to perform: when the power supply system is started, the input power is controlled to increase; the control module controls the action of the output switch according to the input power and the load power of the load: if the input power does not match the load power, the output switch is controlled to switch between the on state and the off state; if the input power matches the load power, the output switch is controlled to remain in the on state.
[0006] To achieve the above-mentioned purpose, the present case provides a control method for a power supply system, wherein the power supply system includes an input module and an output module. The output module includes an output capacitor, an output switch and a load, wherein the output capacitor is electrically connected to the input module, the output switch is electrically connected between the first end of the output capacitor and the first end of the load, and the second end of the load is electrically connected to the second end of the output capacitor. The control method includes: when the power supply system is started, controlling the input power to increase; controlling the action of the output switch according to the input power and the load power of the load: if the input power does not match the load power, controlling the output switch to switch between the on state and the off state; if the input power matches the load power, controlling the output switch to remain in the on state. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 This is a circuit diagram of the power supply system of this case;
[0008] Figure 2 for Figure 1 The timing diagram of capacitor voltage and input power of the power supply system shown; and
[0009] Figure 3 for Figure 1 The control method flow chart of the power supply system is shown.
[0010] The reference numerals are described as follows:
[0011] 1: Power supply system
[0012] 3: Input module
[0013] 6: Output module
[0014] Cout: output capacitance
[0015] Mout: Output switch
[0016] R: Load
[0017] 7: Control module
[0018] t1, t2, t3, t4: time
[0019] S1-S4: Steps DETAILED DESCRIPTION
[0020] Some typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different implementations without departing from the scope of the present invention, and the descriptions and drawings therein are essentially for illustrative purposes rather than for limiting the present invention.
[0021] It should be noted that the following embodiments and features of the embodiments may be combined with each other if there is no conflict, and the same or similar concepts or processes may not be repeated in some embodiments.
[0022] See also Figure 1 and Figure 2 ,in Figure 1 This is the circuit structure diagram of the power supply system in this case. Figure 2 for Figure 1 The voltage and input power timing diagram of the power supply system are shown in FIG. Figure 1 As shown, the power supply system 1 of the present case includes an input module 3 , an output module 6 and a control module 7 .
[0023] The output module 6 is electrically connected to the input module 3 to receive the input power provided by the input module 3, and includes an output capacitor Cout, an output switch Mout and a load R. The specific type of the output switch Mout is not limited herein. The output capacitor Cout is connected in parallel with the input module 3. The output switch Mout is electrically connected between a first end of the output capacitor Cout and a first end of the load R, and a second end of the load R is electrically connected to a second end of the output capacitor Cout.
[0024] The control module 7 is electrically connected to the input module 3 and the output module 6, and is configured to execute: when the power supply system is started, the input power is controlled to increase, and the voltage on the output capacitor Cout is detected. The control module 7 controls the action of the output switch Mout according to the confirmation result of whether the input power and the load power on the load R match, wherein when the control module 7 confirms that the input power does not match the load power on the load R, that is, the input power is not equal to the load power on the load R, the output switch Mout is controlled to switch between the on state and the off state; when the control module 7 confirms that the input power matches the load power of the load R, that is, the input power is equal to the load power on the load L, the output switch Mout is controlled to remain in the on state. It should be noted that this scheme can judge whether the input power matches the load power according to whether the voltage on the output capacitor Cout is continuously pulled down. If the capacitance of the output capacitor Cout is stable within a certain threshold range, it can be considered that the input power matches the load power at this time. Furthermore, when the input power does not match the load power on the load R, the control module 7 also controls the output switch Mout to switch between the on state and the off state according to the comparison result between the voltage on the output capacitor Cout and the first voltage threshold and the second voltage threshold, wherein the first voltage threshold and the second voltage threshold can be set according to actual needs, and the first voltage threshold is greater than the second voltage threshold, wherein when the control module 7 confirms that the voltage on the output capacitor Cout is greater than the first voltage threshold, the output switch Mout is controlled to be on to discharge the output capacitor Cout; when the control module 7 confirms that the voltage on the output capacitor Cout is less than the second voltage threshold, the output switch Mout is controlled to be off to charge the output capacitor Cout.
[0025] See also Figure 2 And cooperate Figure 1, at time t3, the input power is equal to the load power. Before time t3, that is, when the input power does not match the load power, when the control module 7 confirms that the voltage on the output capacitor Cout is greater than the first voltage threshold, for example, at time t1, the control module 7 controls the output switch Mout to be turned on, and the output capacitor Cout discharges the load R, so that the voltage of the output capacitor Cout decreases after a delay. When the control module 7 confirms that the voltage on the output capacitor Cout is less than the first voltage threshold, for example, at time t2, the control module 7 controls the output switch Mout to be turned off, so that the input power charges the output capacitor Cout, and the voltage on the output capacitor Cout increases after a delay. The control module 7 repeats the above operation process until the input power matches the power of the load R, that is, at time t3, the control module 7 controls the output switch Mout to remain on, so that the state of starting the power supply system 1 is normal, and the voltage on the output capacitor Cout rises to the target voltage, and the voltage on the output capacitor Cout is maintained unchanged. It should be noted that, considering the charging and discharging characteristics of the capacitor, the constant voltage of the output capacitor Cout here means that the capacitor voltage is maintained near the target voltage, not unchanged. Further, when the input power rises to the target input power, the input power is maintained unchanged, that is, at time t4, wherein the target voltage is greater than the first voltage threshold, and the target voltage can be set according to actual needs.
[0026] In this embodiment, the difference between the first voltage threshold and the second voltage threshold is positively correlated with the change in the voltage of the output capacitor Cout. In other words, when the difference between the first voltage threshold and the second voltage threshold is larger, the change in the voltage of the output capacitor Cout is larger, making it easier to start the overall power supply system, wherein the change in energy on the output capacitor Cout is Where C is the capacitance of the output capacitor Cout, U1 is the first voltage threshold, and U2 is the second voltage threshold. In this embodiment, when the second voltage threshold is smaller, the input power can be matched with the power of the load R when the input power is smaller, where the power of the load R is Wherein U2 is the second voltage threshold, and R1 is the resistance value of the load R.
[0027] See also Figure 3 , which is Figure 1The control method flow chart of the power supply system shown in the figure. First, execute step S1, and when the power supply system 1 is started, control the input power to increase. Then, execute step S2, and control the output switch Mout to switch between the on state and the off state according to the input power and the load power. Then execute step S3 to confirm whether the input power and the load power match. When the confirmation result of step S3 is no, that is, the input power and the load power do not match, re-execute step S2. When the confirmation result of step S2 is yes, that is, the input power and the load power match, execute step S4 to control the output switch Mout to remain in the on state.
[0028] In some embodiments, step S2 further includes:
[0029] When the voltage of the output capacitor Cout is greater than a first voltage threshold, the output switch Mout is controlled to be turned on; when the voltage of the output capacitor Cout is less than a second voltage threshold, the output switch Mout is controlled to be turned off, wherein the first voltage threshold is greater than the second voltage threshold.
[0030] In some embodiments, step S4 further includes:
[0031] After the input power matches the load power, when the voltage of the output capacitor Cout rises to a target voltage threshold, the voltage of the output capacitor Cout is controlled to remain unchanged, wherein the target voltage threshold is greater than the first voltage threshold; when the voltage of the output capacitor Cout rises to the target voltage threshold, the input power is controlled to remain unchanged.
[0032] To sum up, the power supply system and control method of the present case control the on and off of the output switch according to the voltage of the output capacitor and the first voltage threshold and the second voltage threshold, thereby realizing the charge and discharge control of the output capacitor until the input power is matched with the load power, thereby reducing the difficulty of successfully starting the power supply system and improving the adaptability of the power supply system.
Claims
1. A power supply system, comprising: An input module, used to provide an input power; an output module electrically connected to the input module and comprising an output capacitor, an output switch and a load, wherein the output capacitor is electrically connected to the input module, the output switch is electrically connected between a first end of the output capacitor and a first end of the load, and a second end of the load is electrically connected to a second end of the output capacitor; and a control module, electrically connected to the input module and the output module, and configured to execute: When the power supply system is started, controlling the input power to increase; and The action of the output switch is controlled according to the input power and a load power of the load, wherein: If the input power does not match the load power, the output switch is controlled to switch between an on state and an off state; If the input power matches the load power, the output switch is controlled to maintain the on state.
2. The power supply system according to claim 1, wherein: The control module is also configured to perform: When the input power does not match the load power, the output switch is controlled to switch between the on state and the off state according to the voltage of the output capacitor and a first voltage threshold and a second voltage threshold, wherein: When the voltage of the output capacitor is greater than the first voltage threshold, controlling the output switch to be turned on; When the voltage of the output capacitor is less than the second voltage threshold, controlling the output switch to be disconnected; The first voltage threshold is greater than the second voltage threshold.
3. The power supply system according to claim 2, wherein: The control module is also configured to perform: After the input power matches the load power, when the voltage of the output capacitor rises to a target voltage threshold, the voltage of the output capacitor is controlled to remain unchanged, wherein the target voltage threshold is greater than the first voltage threshold.
4. The power supply system according to claim 3, wherein: The control module is also configured to perform: When the voltage of the output capacitor rises to the target voltage threshold, the input power is controlled to remain unchanged.
5. A control method for a power supply system, wherein: The power supply system comprises an input module and an output module, wherein the output module comprises an output capacitor, an output switch and a load, wherein the output capacitor is electrically connected to the input module, the output switch is electrically connected between a first end of the output capacitor and a first end of the load, and a second end of the load is electrically connected to a second end of the output capacitor. The control method comprises: When the power supply system is started, the input power is controlled to increase; The action of the output switch is controlled according to the input power and a load power of the load, wherein: If the input power does not match the load power, controlling the output switch to switch between an on state and an off state; and If the input power matches the load power, the output switch is controlled to remain in an on state.
6. The control method according to claim 5, wherein: If the input power does not match the load power, the output switch is controlled to switch between an on state and an off state, including: When the voltage of the output capacitor is greater than a first voltage threshold, controlling the output switch to be turned on; When the voltage of the output capacitor is less than a second voltage threshold, controlling the output switch to be disconnected; The first voltage threshold is greater than the second voltage threshold.
7. The control method according to claim 6, wherein: The control method also includes: After the input power matches the load power, when the voltage of the output capacitor rises to a target voltage threshold, the voltage of the output capacitor is controlled to remain unchanged, wherein the target voltage threshold is greater than the first voltage threshold.
8. The control method according to claim 7, wherein: The control method also includes: When the voltage of the output capacitor rises to the target voltage threshold, the input power is controlled to remain unchanged.