Power supply circuit, control method thereof and electronic equipment
By designing a power supply circuit in electronic equipment including power supply, connection switching module, precharge module and energy storage module, the pulse current problem caused by capacitors in the constant voltage circuit is solved, and the effect of reducing the risk of device damage and simplifying the circuit is achieved.
Patent Information
- Application Number
- CN202510042812.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2025-05-13
AI Technical Summary
In electronic devices, capacitors can cause extremely pulse current when directly connected to the constant voltage loop, which may damage the devices in the loop, including the capacitor itself.
A power supply circuit is designed, including power supply, connection switching module, precharge module and energy storage module. By connecting the switching module to establish an electrical connection between the power supply and the pre-charge module, the power supply can charge the energy storage module through the pre-charge module, and limit the charging current. Subsequently, when the power storage module voltage is close to the power supply voltage, the electrical connection between the power supply and the pre-charge module is disconnected, and an electrical connection between the power supply and the energy storage module is established to directly charge the energy storage module.
It effectively reduces the risk of device damage, simplifies the circuit structure, reduces the use of MCU resources, and does not affect the filtering effect.
Smart Images
Figure CN119995084A_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present application relate to the technical field of electronic circuits, and in particular to a power supply circuit and a control method thereof and an electronic device. Background Art
[0002] In some electronic devices, a large-capacitance electrolytic capacitor or film capacitor is usually set in parallel with the power supply to filter out current and voltage ripples. Due to the characteristics of the capacitor, the capacitor is close to a short-circuit state when it is directly connected to the constant voltage loop, which will instantly cause a large pulse current in the loop to charge the capacitor. The pulse current may cause damage to the devices in the loop, including the capacitor itself. Summary of the invention
[0003] The embodiments of the present application provide a power supply circuit and a control method thereof and an electronic device, which can reduce the risk of device damage.
[0004] In a first aspect, an embodiment of the present application provides a power supply circuit, comprising: a power supply, a connection switching module, a pre-charging module and an energy storage module; a first end of the connection switching module is electrically connected to the power supply, a second end of the connection switching module is electrically connected to the first end of the pre-charging module, and a third end of the connection switching module is electrically connected to the second end of the pre-charging module and the energy storage module, respectively; the connection switching module is configured to establish an electrical connection between the power supply and the pre-charging module so that the power supply charges the energy storage module through the pre-charging module, or is configured to establish an electrical connection between the power supply and the energy storage module so that the power supply charges the energy storage module block charging; the pre-charging module includes a voltage dividing unit, a clamping unit and an indicating unit, the clamping unit and the indicating unit are connected in series and then in parallel with the voltage dividing unit; the voltage dividing unit is configured to divide the voltage of the power supply by a combination of the voltage dividing unit and the energy storage module when the power supply is electrically connected to the pre-charging module; the clamping unit is configured to be turned on when the voltage across the voltage dividing unit is greater than a first voltage threshold, and is also configured to be turned off when the voltage across the voltage dividing unit is less than or equal to the first voltage threshold; the indicating unit is configured to output an indication signal when the clamping unit is turned on, and stop outputting the indication signal when the clamping unit is turned off.
[0005] In one or more embodiments, the power supply circuit further includes a unidirectional conductive unit; the second end of the pre-charging module is electrically connected to the energy storage module and the connection switching module respectively through the unidirectional conductive module;
[0006] The unidirectional conductive module is configured to be turned on when the positive electrode of the power supply is electrically connected to the pre-charging module, and to be turned off when the negative electrode of the power supply is electrically connected to the pre-charging module. In one or more embodiments, the pre-charging module further includes a current limiting unit; the current limiting unit is connected in series with the clamping unit and the indicating unit, and the current limiting unit is configured to limit the current flowing through the indicating unit and the clamping unit.
[0007] In one or more embodiments, the connection switching unit includes a first interface, a second interface, a third interface, a first electrical connection line, and a second electrical connection line. The first interface is electrically connected to the positive pole of the power supply, the second interface is electrically connected to the first end of the pre-charging module, and the third interface is electrically connected to the second end of the pre-charging module and the energy storage module respectively; wherein the connection switching unit is configured to establish an electrical connection between the first interface and the third interface through the first electrical connection line to establish an electrical connection between the power supply and the energy storage module, or the connection switching unit is configured to establish an electrical connection between the first interface and the second interface through the second electrical connection line to establish an electrical connection between the power supply and the pre-charging module.
[0008] In one or more embodiments, the voltage dividing unit includes a first resistor; the first resistor is electrically connected between the connection switching module and the energy storage module.
[0009] In one or more embodiments, the indicating unit includes a light emitting diode; an anode of the light emitting diode is electrically connected to the connection switching module, and a cathode of the light emitting diode is electrically connected to the energy storage module.
[0010] In one or more embodiments, the clamping unit includes a clamping diode; an anode of the clamping diode is electrically connected to the energy storage module, and a cathode of the clamping diode is electrically connected to the connection switching module.
[0011] In one or more embodiments, the unidirectional conduction unit includes a first diode; an anode of the first diode is electrically connected to the second end of the pre-charging module, and a cathode of the first diode is electrically connected to the energy storage module and the connection switching module, respectively.
[0012] In one or more embodiments, the current limiting unit includes a second resistor; the second resistor is connected in series with the clamping unit and the indicating unit.
[0013] In one or more embodiments, the energy storage module includes a capacitor; the capacitor is electrically connected between the connection switching module and the negative electrode of the power supply.
[0014] In a second aspect, an embodiment of the present application provides a control method for controlling the power supply circuit as described above, the control method comprising: establishing an electrical connection between the power supply and the pre-charging module through the connection switching module, so that the power supply charges the energy storage module through the pre-charging module, and the indication unit outputs an indication signal; when the indication unit stops outputting the indication signal, disconnecting the electrical connection between the power supply and the pre-charging module through the connection switching module, and establishing an electrical connection between the power supply and the energy storage module.
[0015] In a third aspect, an embodiment of the present application provides an electronic device, comprising the power supply circuit as described above.
[0016] The beneficial effects of the present application are as follows: the power supply circuit of the embodiment of the present application includes a power supply, a connection switching module, a pre-charging module and an energy storage module, and the pre-charging module includes a voltage dividing unit, a clamping unit and an indication unit. Among them, the first end of the connection switching module is electrically connected to the power supply, the second end of the connection switching module is electrically connected to the first end of the pre-charging module, the third end of the connection switching module is electrically connected to the second end of the pre-charging module and the energy storage module respectively, and the clamping unit is connected in series with the indication unit and then connected in parallel with the voltage dividing unit. When the energy storage module starts to be charged, first, the connection switching module establishes an electrical connection between the power supply and the pre-charging module so that the power supply charges the energy storage module through the pre-charging module to limit the current charging the energy storage module, thereby reducing the risk of damage to the device. At the same time, the voltage on the energy storage module gradually increases from zero, and the sum of the voltage at both ends of the voltage dividing unit and the voltage on the energy storage module is the voltage of the power supply, so the voltage at both ends of the voltage dividing unit gradually decreases from the voltage of the power supply, then the voltage at both ends of the voltage dividing unit is greater than the first voltage threshold, and the clamping unit is turned on, at this time, the indication unit outputs an indication signal. The voltage on the energy storage module gradually increases, and the voltage at both ends of the voltage divider unit gradually decreases until the voltage at both ends of the voltage divider unit decreases to less than or equal to the first voltage threshold, the clamping unit is cut off, and the indication unit stops outputting the indication signal, and it can be determined that the voltage of the energy storage module is close to the voltage of the power supply. After that, the connection switching module can be made to disconnect the electrical connection between the power supply and the pre-charging module, and establish an electrical connection between the power supply and the energy storage module, so that the power supply charges the energy storage module. Since the voltage of the energy storage module is close to the voltage of the power supply at this time, the current charging the energy storage module is also small, and the risk of device damage is low. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] One or more embodiments are exemplarily described by the figures in the corresponding drawings, and these exemplary descriptions are not intended to limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements.
[0018] Figure 1 are two circuit structure schematic diagrams of circuits used for power supply in the related art;
[0019] Figure 2 This is a schematic diagram of a block diagram of a power supply circuit provided in an embodiment of the present application. Figure 1 ;
[0020] Figure 3 This is a schematic diagram of a block diagram of a power supply circuit provided in an embodiment of the present application. Figure 2 ;
[0021] Figure 4 This is a schematic diagram of a block diagram of a power supply circuit provided in an embodiment of the present application. Figure 3 ;
[0022] Figure 5 This is a schematic diagram of a block diagram of a power supply circuit provided in an embodiment of the present application. Figure 4 ;
[0023] Figure 6 is with Figure 5 The circuit structure diagram corresponding to the composition block diagram shown;
[0024] Figure 7 is a schematic diagram of electrical connection between a power supply circuit and a DC-DC conversion circuit provided in an embodiment of the present application;
[0025] Figure 8 It is a flow chart of the control method provided in the embodiment of the present application. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and in detail in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0027] It should be noted that, when an element is described as being “connected to” another element, it may be directly connected to the other element, or one or more intervening elements may exist therebetween.
[0028] In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as there is no structural conflict between them.
[0029] In some electronic devices, a large-capacitance electrolytic capacitor or film capacitor is usually set in parallel with the power supply to filter out current and voltage ripples. Due to the characteristics of the capacitor, the capacitor is close to a short-circuit state when it is directly connected to the constant voltage loop, which will instantly cause a large pulse current in the loop to charge the capacitor. The pulse current may cause damage to the devices in the loop, including the capacitor itself.
[0030] In order to solve the above problems, in the related art, a control switch is usually added between the battery and the capacitor, and a pre-charging circuit is connected in parallel at both ends of the control switch. The function of the combination of the pre-charging circuit and the control switch is to limit the current charging the capacitor when charging the capacitor, and close the main circuit until the capacitor voltage is close to the battery voltage.
[0031] Figure 1 Two circuit structures provided by the related art are exemplified. Figure 1 As shown in part (A1) of FIG. 1 , the pre-charge circuit 300 and the switch KS1 are connected in parallel between the positive electrode of the battery BA1 and the capacitor CS1; or Figure 1 As shown in part (A2) of FIG. 1 , the pre-charging circuit 300 and the switch KS1 are connected in parallel between the negative electrode of the battery BA1 and the capacitor CS1. The pre-charging circuit 300 includes a resistor RS1 and a diode DS1. First, the switch KS1 is kept open to limit the current charging the capacitor through the pre-charging circuit 300 when the capacitor is initially charged; the switch KS1 is then closed after the voltage of the capacitor CS1 is close to the voltage of the battery BA1.
[0032] However, for Figure 1 In the circuit structure shown in FIG. 1 , the switch KS1 is usually a controllable switch such as a relay. These switches (such as the contacts of the relay) have impedance, which will cause additional power loss. In addition, a controllable switch with a higher price needs to be selected in high current application scenarios, especially for Figure 1 The circuit shown in part (A2) of the circuit will also increase the overall impedance of the branch where the capacitor CS1 and the switch KS1 are located, and increase the area of the branch where the capacitor CS1 and the switch KS1 are located, thereby reducing the filtering effect; secondly, it is necessary to set a corresponding control circuit for the switch KS1, for example, it is necessary to detect the voltage across the capacitor CS1 to control the on or off of the switch KS1, the circuit structure is complex, and it needs to occupy the resources of the MCU (Microcontroller Unit).
[0033] Based on this, an embodiment of the present application provides a power supply circuit that reduces damage to devices without using a controllable switch. Accordingly, there is no need to design circuits related to the controllable switch, which reduces the complexity of the circuit, reduces the occupation of MCU resources, and does not affect the filtering effect.
[0034] Please refer to Figure 2 , Figure 2 Schematic diagram of a block diagram of a power supply circuit provided in an embodiment of the present application. Figure 2 As shown, the power supply circuit 100 includes a connection switching module 10 , a pre-charging module 20 , an energy storage module 30 and a power source 40 .
[0035] The first end of the connection switching module 10 is electrically connected to the power source 40, the second end of the connection switching module 10 is electrically connected to the first end of the pre-charging module 20, and the third end of the connection switching module 10 is electrically connected to the second end of the pre-charging module 20 and the energy storage module 30. The pre-charging module 20 includes a voltage dividing unit 21, a clamping unit 22 and an indicating unit 23, and the clamping unit 22 and the indicating unit 23 are connected in series and then connected in parallel with the voltage dividing unit 21.
[0036] Specifically, the connection switching module 10 is configured to establish an electrical connection between the power supply 40 and the pre-charging module 20 so that the power supply 40 charges the energy storage module 30 through the pre-charging module 20, or the connection switching module 10 is configured to establish an electrical connection between the power supply 40 and the energy storage module 30 so that the power supply 40 charges the energy storage module 30. The voltage dividing unit 21 is configured to divide the voltage of the power supply 40 by the combination of the voltage dividing unit 21 and the energy storage module 30 when the power supply 40 is electrically connected to the pre-charging module 20. The clamping unit 22 is configured to be turned on when the voltage across the voltage dividing unit 21 is greater than a first voltage threshold, and the clamping unit 22 is also configured to be turned off when the voltage across the voltage dividing unit 21 is less than or equal to the first voltage threshold. The indication unit 23 is configured to output an indication signal when the clamping unit 22 is turned on, and stop outputting the indication signal when the clamping unit 22 is turned off.
[0037] In practical applications, the electrical connection between the power supply 40 and the pre-charging module 20 can be established by connecting the switching module 10, so that the power supply 40 charges the energy storage module 30 through the pre-charging module 20. At this time, the pre-charging module 20 can limit the current for charging the energy storage module 30, thereby reducing the risk of damage to the device (such as the power supply circuit 100 and the device in the system including the power supply circuit 100). At the same time, the voltage on the energy storage module 30 gradually increases from zero, and the sum of the voltage at both ends of the voltage divider unit 21 and the voltage on the energy storage module 30 is the voltage of the power supply 40, so the voltage at both ends of the voltage divider unit 21 gradually decreases from the voltage of the power supply 40, and at this time the voltage at both ends of the voltage divider unit 21 is greater than the first voltage threshold, the clamping unit 22 is turned on, and at the same time, the indication unit 23 outputs an indication signal.
[0038] As the energy storage module 30 is continuously charged, the voltage on the energy storage module 30 gradually increases, and the voltage at both ends of the voltage divider unit 21 gradually decreases. Until the voltage at both ends of the voltage divider unit 21 is reduced to less than or equal to the first voltage threshold, the clamping unit 22 is cut off, and no current flows through the branch where the clamping unit 22 and the indication unit 23 are located, and the indication unit 23 stops outputting the indication signal. At this time, it can be determined that the voltage of the energy storage module 30 is close to the voltage of the power supply 40. Afterwards, the connection switching module 10 disconnects the electrical connection between the power supply 40 and the pre-charging module 20, and establishes an electrical connection between the power supply 40 and the energy storage module 30, so that the power supply 40 charges the energy storage module 30. Since the voltage of the energy storage module 30 is close to the voltage of the power supply 40 at this time, the current charging the energy storage module 30 is also small, and the risk of device damage is low. Secondly, there is no need to use a controllable switch, nor is there any need to design a circuit related to the controllable switch (for example, there is no need to design a circuit for detecting the voltage of the energy storage module 30), which simplifies the circuit structure, reduces the occupation of MCU resources, and does not affect the filtering effect.
[0039] In some embodiments, Figure 3 As shown, the power source 40 includes a battery. The battery includes a plurality of cells connected in parallel, in series or in hybrid connection for storing and providing electric energy, and the hybrid connection includes both series connection and parallel connection.
[0040] In some embodiments, Figure 4 As shown, the power supply circuit 100 further includes a unidirectional conductive unit 50. The second end of the pre-charging module 20 is electrically connected to the energy storage module 30 and the connection switching module 10 respectively through the unidirectional conductive module 50.
[0041] Specifically, the unidirectional conductive module 50 is configured to be turned on when the positive electrode of the power source 40 (the embodiment takes the positive electrode of the battery as an example) is electrically connected to the pre-charging module 20, and to be turned off when the negative electrode of the power source 40 is electrically connected to the pre-charging module 20. It can be seen that the unidirectional conductive module 50 is turned on when the power source 40 is positively connected, and the unidirectional conductive module 50 is turned off when the power source 40 is reversely connected, which can prevent the power source 40 from being reversely connected, and is conducive to reducing the risk of device damage.
[0042] In some embodiments, Figure 5 As shown, the pre-charging module 20 further includes a current limiting unit 24. The current limiting unit 24 is connected in series with the clamping unit 22 and the indicating unit 23.
[0043] Specifically, the current limiting unit 24 is configured to limit the current flowing through the indicating unit 23 and the clamping unit 22 , thereby preventing the indicating unit 23 and the clamping unit 22 from being damaged due to excessive current.
[0044] Please refer to Figure 6 , Figure 6 An example is shown with Figure 5A circuit structure corresponding to the block diagram shown in FIG. Figure 6 As shown, the connection switching unit 10 includes a first interface K1, a second interface K2, a third interface K3, a first electrical connection line L1 and a second electrical connection line L2.
[0045] The first interface K1 is electrically connected to the positive electrode of the power source 40 , the second interface K2 is electrically connected to the first end of the pre-charging module 20 , and the third interface K3 is electrically connected to the second end of the pre-charging module 20 and the energy storage module 30 , respectively.
[0046] Specifically, the connection switching unit 10 is configured to establish an electrical connection between the first interface K1 and the third interface L3 through the first electrical connection line L1 to establish an electrical connection between the power supply 40 and the energy storage module 30, so that the power supply 40 charges the energy storage module 30, or, the connection switching unit 10 is configured to establish an electrical connection between the first interface K1 and the second interface L2 through the second electrical connection line L2 to establish an electrical connection between the power supply 40 and the pre-charging module 20, so that the power supply 40 charges the energy storage module 30 through the pre-charging module 20.
[0047] The first interface K1 is connected to the first end of the switching module 10 , the third interface K3 is connected to the second end of the switching module 10 , and the second interface K2 is connected to the third end of the switching module 10 .
[0048] In some embodiments, the first end of the first electrical connection line L1 and the first end of the second electrical connection line L2 are pressed together into one end, which remains electrically connected to the first interface K1. At the same time, the second end of the first electrical connection line L1 is electrically connected to the third interface K3, or the second end of the second electrical connection line L2 is electrically connected to the second interface K2.
[0049] In some embodiments, the voltage dividing unit 21 includes a first resistor R1 .
[0050] The first resistor R1 is electrically connected between the connection switching module 10 and the energy storage module 30 .
[0051] In some embodiments, the indicating unit 23 includes a light emitting diode DA1 .
[0052] The anode of the light emitting diode DA1 is electrically connected to the connection switching module 10, and the cathode of the light emitting diode DA1 is electrically connected to the energy storage module 30. The cathode of the light emitting diode DA1 is the second end of the pre-charging module 20.
[0053] When the light emitting diode DA1 is lit, the corresponding indication unit 23 outputs an indication signal; when the light emitting diode DA1 is turned off, the corresponding indication unit 23 stops outputting the indication signal.
[0054] In some embodiments, the clamping unit 22 includes a clamping diode DB1 .
[0055] The anode of the clamping diode DB1 is electrically connected to the energy storage module 30 , and the cathode of the clamping diode DB1 is electrically connected to the connection switching module 10 . The anode of the clamping diode DB1 is the first end of the pre-charging module 20 .
[0056] In some embodiments, the unidirectional conducting unit 50 includes a first diode DC1 .
[0057] The anode of the first diode DC1 is electrically connected to the second end of the pre-charging module 20 , and the cathode of the first diode DC1 is electrically connected to the connection switching module 10 and the energy storage module 30 , respectively.
[0058] In some embodiments, the current limiting unit 24 includes a second resistor R2 .
[0059] Among them, the second resistor R2 is connected in series with the clamping unit 22 and the indicating unit 23. This embodiment exemplifies an electrical connection mode in which the clamping unit 22, the second resistor R2 and the indicating unit 23 are connected in series in sequence, and in other embodiments, other series connection modes may also be set, such as the second resistor R2, the clamping unit 22 and the indicating unit 23 are connected in series in sequence.
[0060] In some embodiments, the energy storage module 30 includes a capacitor C1 .
[0061] The capacitor C1 is electrically connected between the connection switching module 10 and the negative electrode of the power source 40 .
[0062] In practical applications, first, an electrical connection is established between the power supply 40 and the pre-charging module 20 through the second electrical connection line L2. In some specific embodiments, an electrical connection between the power supply 40 and the pre-charging module 20 can be established through the second electrical connection line before the electronic device including the power supply circuit leaves the factory. At this time, the power supply 40 charges the capacitor C1 through the pre-charging module 20. The pre-charging module 20 can limit the current for charging the energy storage module 30, thereby reducing the risk of damage to the device (such as capacitor C1). At the same time, when the electrical connection between the power supply 40 and the pre-charging module 20 is established through the second electrical connection line L2, the voltage on the capacitor C1 can be regarded as zero, and the voltage across the first resistor R1 is the voltage of the power supply 40, that is, the voltage across the combination of the clamping diode DB1, the second resistor R2 and the light-emitting diode DA1 connected in series is the voltage of the power supply 40. The voltage across the voltage divider unit 21 is greater than the first voltage threshold, that is, the voltage across the combination of the clamping diode DB1, the second resistor R2 and the light-emitting diode DA1 connected in series is greater than the first voltage threshold, and the clamping diode DB1 is reversely broken down. At the same time, the light-emitting diode DA1 is forward-conducted and lit to output an indication signal.
[0063] Then, the capacitor C1 is continuously charged, the voltage on the capacitor C1 gradually increases from zero, and the voltage across the first resistor R1 gradually decreases from the voltage of the power supply 40. Until the voltage across the first resistor R1 is reduced to less than or equal to the first voltage threshold, the clamping diode DB1 is cut off, and no current flows through the branch where the clamping diode DB1, the second resistor R2 and the light-emitting diode DA1 are located, that is, no current flows through the clamping diode DB1, the second resistor R2 and the light-emitting diode DA1, and the light-emitting diode DA1 is reversely cut off and extinguished to stop outputting the indication signal. At this time, it can be determined that the voltage of the capacitor C1 is close to the voltage of the power supply 40. In this case, the electrical connection between the power supply 40 and the pre-charging module 20 is no longer established through the second electrical connection line L2, that is, the electrical connection between the power supply 40 and the pre-charging module 20 is disconnected, and the electrical connection between the power supply 40 and the capacitor C1 is established through the first electrical connection line L1, so that the power supply 40 directly charges the capacitor C1. Since the voltage of the capacitor C1 is close to the voltage of the power supply 40 at this time, the current charging the capacitor C1 is also small, and the risk of damage to the device is low. Secondly, there is no need to use a controllable switch, nor to design circuits related to the controllable switch (for example, there is no need to design a circuit to detect the voltage of the energy storage module 30), which simplifies the circuit structure and reduces the occupation of MCU resources without affecting the filtering effect.
[0064] In addition, when establishing an electrical connection between the power supply 40 and the pre-charging module 20 through the second electrical connection line L2, if the light-emitting diode DA1 is not lit, it can be determined that the positive and negative poles of the power supply 40 are reversed, and the positive and negative connection directions of the power supply 40 should be switched.
[0065] Understandably, Figure 2-Figure 6 The power supply circuit 100 shown can be applied to any application scenario where power supply is required. For example, the power supply circuit 100 can be used to connect a load to supply power to the load. Figure 7 As shown, the power supply circuit 100 can be used to electrically connect the DC-DC conversion circuit 200 to provide an input voltage to the DC-DC conversion circuit 200, so that the DC-DC conversion circuit 200 can convert the voltage provided by the power supply circuit 100 into another DC voltage of a different value. The DC-DC conversion circuit 200 can be a voltage conversion circuit such as a buck converter, a boost converter, or a buck-boost converter.
[0066] Please refer to Figure 8 , Figure 8 Flow chart of the control method provided in the embodiment of the present application. The control method is used to control the power supply circuit 100 in any embodiment of the present application. Figure 8 As shown, the control method includes:
[0067] Step 801: Establish an electrical connection between a power source and a pre-charging module by connecting a switching module, so that the power source charges the energy storage module through the pre-charging module, and an indication unit outputs an indication signal.
[0068] Step 802: When the indication unit stops outputting the indication signal, the electrical connection between the power source and the pre-charging module is disconnected through the connection switching module, and the electrical connection between the power source and the energy storage module is established.
[0069] Specifically, an electrical connection is established between the power supply 40 and the pre-charging module 20 by connecting the switching module 10, so that the power supply 40 charges the energy storage module 30 through the pre-charging module 20. At this time, the pre-charging module 20 can limit the current for charging the energy storage module 30, thereby reducing the risk of damage to the device (such as the power supply circuit 100 and the device in the system including the power supply circuit 100). At the same time, the voltage on the energy storage module 30 gradually increases from zero, and the sum of the voltage at both ends of the voltage divider unit 21 and the voltage on the energy storage module 30 is the voltage of the power supply 40, so the voltage at both ends of the voltage divider unit 21 gradually decreases from the voltage of the power supply 40, and at this time the voltage at both ends of the voltage divider unit 21 is greater than the first voltage threshold, the clamping unit 22 is turned on, and at the same time, the indication unit 23 outputs an indication signal.
[0070] As the energy storage module 30 is continuously charged, the voltage on the energy storage module 30 gradually increases, and the voltage at both ends of the voltage divider unit 21 gradually decreases. Until the voltage at both ends of the voltage divider unit 21 is reduced to less than or equal to the first voltage threshold, the clamping unit 22 is cut off, and no current flows through the branch where the clamping unit 22 and the indication unit 23 are located, and the indication unit 23 stops outputting the indication signal. At this time, it can be determined that the voltage of the energy storage module 30 is close to the voltage of the power supply 40. Afterwards, the connection switching module 10 disconnects the electrical connection between the power supply 40 and the pre-charging module 20, and establishes an electrical connection between the power supply 40 and the energy storage module 30, so that the power supply 40 charges the energy storage module 30. Since the voltage of the energy storage module 30 is close to the voltage of the power supply 40 at this time, the current charging the energy storage module 30 is also small, and the risk of device damage is low. Secondly, there is no need to use a controllable switch, nor is there any need to design a circuit related to the controllable switch (for example, there is no need to design a circuit for detecting the voltage of the energy storage module 30), which simplifies the circuit structure, reduces the occupation of MCU resources, and does not affect the filtering effect.
[0071] An embodiment of the present application further provides an electronic device, which includes a power supply circuit 100 as in any embodiment of the present application.
[0072] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
[0073] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them. Under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. It should be understood by ordinary technicians in this field that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A power supply circuit, characterized in that: include: Power supply, connection switching module, pre-charging module and energy storage module; The first end of the connection switching module is electrically connected to the power supply, the second end of the connection switching module is electrically connected to the first end of the pre-charging module, and the third end of the connection switching module is electrically connected to the second end of the pre-charging module and the energy storage module respectively; The connection switching module is configured to establish an electrical connection between the power source and the pre-charging module so that the power source charges the energy storage module through the pre-charging module, or is configured to establish an electrical connection between the power source and the energy storage module so that the power source charges the energy storage module; The pre-charging module comprises a voltage dividing unit, a clamping unit and an indication unit, wherein the clamping unit is connected in series with the indication unit and then connected in parallel with the voltage dividing unit; The voltage dividing unit is configured to divide the voltage of the power source by a combination of the voltage dividing unit and the energy storage module when the power source is electrically connected to the pre-charging module; The clamping unit is configured to be turned on when the voltage across the voltage dividing unit is greater than a first voltage threshold, and is also configured to be turned off when the voltage across the voltage dividing unit is less than or equal to the first voltage threshold; The indication unit is configured to output an indication signal when the clamp unit is turned on, and stop outputting the indication signal when the clamp unit is turned off.
2. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes a unidirectional conductive unit; The second end of the pre-charging module is electrically connected to the energy storage module and the connection switching module respectively through the unidirectional conductive module; The unidirectional conductive module is configured to be turned on when the positive electrode of the power source is electrically connected to the pre-charging module, and to be turned off when the negative electrode of the power source is electrically connected to the pre-charging module.
3. The power supply circuit according to claim 1, characterized in that: The pre-charging module also includes a current limiting unit; The current limiting unit is connected in series with the clamping unit and the indicating unit, and the current limiting unit is configured to limit the current flowing through the indicating unit and the clamping unit.
4. The power supply circuit according to claim 1, characterized in that: The connection switching unit includes a first interface, a second interface, a third interface, a first electrical connection line and a second electrical connection line; The first interface is electrically connected to the positive electrode of the power supply, the second interface is electrically connected to the first end of the pre-charging module, and the third interface is electrically connected to the second end of the pre-charging module and the energy storage module respectively; In which, the connection switching unit is configured to establish an electrical connection between the first interface and the third interface through the first electrical connection line to establish an electrical connection between the power supply and the energy storage module, or, the connection switching unit is configured to establish an electrical connection between the first interface and the second interface through the second electrical connection line to establish an electrical connection between the power supply and the pre-charging module.
5. The power supply circuit according to claim 1, characterized in that: The voltage dividing unit includes a first resistor; The first resistor is electrically connected between the connection switching module and the energy storage module.
6. The power supply circuit according to claim 1, characterized in that: The indicating unit comprises a light emitting diode; The anode of the light emitting diode is electrically connected to the connection switching module, and the cathode of the light emitting diode is electrically connected to the energy storage module.
7. The power supply circuit according to claim 1, characterized in that: The clamping unit includes a clamping diode; The anode of the clamping diode is electrically connected to the energy storage module, and the cathode of the clamping diode is electrically connected to the connection switching module.
8. The power supply circuit according to claim 2, characterized in that: The unidirectional conductive unit includes a first diode; The anode of the first diode is electrically connected to the second end of the pre-charging module, and the cathode of the first diode is electrically connected to the energy storage module and the connection switching module respectively.
9. The power supply circuit according to claim 3, characterized in that: The current limiting unit includes a second resistor; The second resistor is connected in series with the clamping unit and the indicating unit.
10. The power supply circuit according to claim 1, characterized in that: The energy storage module includes a capacitor; The capacitor is electrically connected between the connection switching module and the negative electrode of the power source.
11. A control method, characterized in that: Used to control the power supply circuit according to any one of claims 1 to 10, the control method comprising: Establishing an electrical connection between the power source and the pre-charging module through the connection switching module, so that the power source charges the energy storage module through the pre-charging module, and the indication unit outputs an indication signal; When the indication unit stops outputting the indication signal, the electrical connection between the power source and the pre-charging module is disconnected through the connection switching module, and the electrical connection between the power source and the energy storage module is established.
12. An electronic device, characterized in that: Comprising a power supply circuit as described in any one of claims 1-10.