Power management circuit and power supply system

Abstract

A power management circuit and a power supply system are used for ensuring that a charge pump generator can be normally started and efficiently output. The power management circuit comprises a rectifying circuit, a switching circuit and a voltage regulating circuit; the input end of the rectifying circuit is connected with the charge pump generator, and the output end is connected with the input end of the switching circuit; the first output end of the switching circuit is connected with the output end of the rectifying circuit, and the second output end is connected with the input end of the voltage regulating circuit; the output end of the voltage regulating circuit is connected with a load. When the initial starting output power of the charge pump generator is low, the input end of the switching circuit is controlled to be connected with the first output end, the output side of the rectifying circuit is short-circuited, charges are output to a confinement electrode of the charge pump generator to be stored, and the output power of the charge pump generator is increased along with the increase of the density of the charges in the confinement electrode. And when the output power of the charge pump generator meets the requirement, the input end of the switching circuit is controlled to be connected with the second output end, and the electric energy is output to rear-end equipment.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and particularly to a power management circuit and a power supply system. Background Art

[0002] A triboelectric nanogenerator (TENG) can convert low-frequency mechanical energy in the environment into electrical energy. Due to impedance mismatch, if this electrical energy is directly supplied to electronic devices, the efficiency is extremely low. Generally, it needs to be rectified, filtered, and voltage-converted by a power management circuit (PMC) and then supplied to the electronic devices connected at the back end, and the efficiency will be greatly improved. At the same time, the triboelectric generator has disadvantages such as large wear and low output power. In order to overcome the above problem of low output power, the industry mostly uses a charge pump structure to improve the output power of the device. The charge pump generator has an output characteristic of gradually increasing from a near-zero initial output. At the initial startup, its output is too low to meet the startup requirements of the switching devices in the existing PMC, so the entire circuit is in an open state. Not only does the PMC have no output, but the charge pump generator cannot generate normal enhancement either. Summary of the Invention

[0003] This application provides a power management circuit and a power supply system for ensuring that the charge pump generator can start normally and output efficiently.

[0004] In a first aspect, an embodiment of this application provides a power management circuit. The power management circuit can be connected to a charge pump generator and is used to convert the electrical energy generated by the charge pump generator into a supply voltage for a load connected at the back end and supply power to the connected load. The power supply control circuit can also adjust the electrical energy output path of the charge pump generator according to the output electrical parameters of the charge pump generator. The power management circuit can include a rectifying circuit, a switching circuit, and a voltage regulating circuit.

[0005] Wherein, the input end of the rectification circuit is used to be connected to the charge pump generator, and the output end of the rectification circuit is connected to the input end of the switching circuit; the first output end of the switching circuit is connected to the output end of the rectification circuit, and the second output end of the switching circuit is connected to the input end of the voltage regulation circuit. The switching circuit is used to control the connection between the input end of the switching circuit and the first output end of the switching circuit when the output voltage of the charge pump generator is less than a first set value or the output current of the charge pump generator is less than a second set value, and to control the connection between the input end of the switching circuit and the second output end of the switching circuit when the output voltage of the charge pump generator is greater than or equal to the first set value or the output current of the charge pump generator is greater than or equal to the second set value; the output end of the voltage regulation circuit is used to be connected to a load.

[0006] With the above design, the rectification circuit can convert the AC electric energy output by the charge pump generator into DC electric energy, and the voltage regulation circuit can convert the voltage output by the rectification circuit into the supply voltage required by the load, so as to meet the power consumption requirements of the load. Since a switching circuit is added between the rectification circuit and the voltage regulation circuit, this switching circuit can control the short circuit of the output side of the rectification circuit when the output voltage and output current amplitude of the charge pump generator are relatively low at the initial start-up, so as to store charges in the confinement electrode of the charge pump generator. As the charge density in the confinement electrode increases, the output power of the charge pump generator also increases. Therefore, when ensuring that the charge pump generator can start quickly and the output power of the charge pump generator can meet the start-up requirements of the voltage regulation circuit, the switching circuit is controlled to conduct to supply power to the load through the rectification circuit and the voltage regulation circuit.

[0007] In a possible design, the switching circuit includes a first switching tube. The first end of the first switching tube is connected to the end of the rectification circuit that outputs high level and the input end of the voltage regulation circuit, and the second end of the first switching tube is connected to the end of the rectification circuit that outputs low level. With the above design, when the first switching tube is turned on, the conduction voltage drop of the switching tube is approximately equal to zero, which is equivalent to the output end of the rectification circuit being directly connected by a wire. At this time, charges can be output through the rectification circuit to be stored in the confinement electrode of the charge pump generator, thereby increasing the charge density in the confinement electrode of the charge pump generator, and further increasing the output power of the charge pump generator to ensure the normal start-up of the charge pump generator. When the output power of the charge pump generator meets the working requirements of the voltage regulation circuit, the first switching tube is then controlled to be turned off to output electric energy to the load through the voltage regulation circuit.

[0008] In a possible design, the power management circuit further includes a first resistor and a second resistor.

[0009] Wherein, the first end of the first resistor is connected to the charge pump generator, and the second end of the first resistor is connected to the control end of the first switching transistor and the first end of the second resistor; the second end of the second resistor is grounded.

[0010] In a possible design, the power management circuit further includes a third resistor and a fourth resistor.

[0011] Wherein, the first end of the third resistor is connected to the end of the rectifying circuit that outputs a high level, and the second end of the third resistor is connected to the control end of the first switching transistor and the first end of the fourth resistor; the second end of the fourth resistor is grounded.

[0012] In a possible design, the power management circuit further includes a timer, and the timer is connected to the control end of the first switching transistor.

[0013] In a possible design, the switching circuit includes a single-pole double-throw switch. The first end of the single-pole double-throw switch is connected to the end of the rectifying circuit that outputs a high level, the second end of the single-pole double-throw switch is connected to the input end of the voltage regulating circuit, and the third end of the single-pole double-throw switch is connected to the end of the rectifying circuit that outputs a low level.

[0014] In a possible design, the switching circuit includes a push-button switch. The first end of the push-button switch is connected to the end of the rectifying circuit that outputs a high level and the input end of the voltage regulating circuit, and the second end of the push-button switch is connected to the end of the rectifying circuit that outputs a low level.

[0015] In a possible design, the voltage regulating circuit is a buck circuit.

[0016] In a possible design, the buck circuit includes: a gas discharge tube, a diode, an inductor, and a capacitor.

[0017] Wherein, the first end of the gas discharge tube is connected to the second output end of the switching circuit, and the second end of the gas discharge tube is respectively connected to the cathode of the diode and the first end of the inductor; the anode of the diode is connected to the end of the rectifying circuit that outputs a low level; the second end of the inductor is connected to the first end of the capacitor; the second end of the capacitor is connected to the anode of the diode.

[0018] In a second aspect, an embodiment of the present application provides a power supply system, which may include a charge pump generator and the power management circuit provided in the first aspect of the present application and any of its possible designs.

[0019] In addition, for the technical effects brought by the second aspect and any of its possible designs, reference may be made to the technical effects brought by different designs in the first aspect of the embodiments of the present application, which will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0021] Figure 1 Structural schematic diagram of a power management circuit provided by an embodiment of the present application Figure 1 ;

[0022] Figure 2 Structural schematic diagram of a switching circuit provided by an embodiment of the present application Figure 1 ;

[0023] Figure 3 Structural schematic diagram of a power management circuit provided by an embodiment of the present application Figure 2 ;

[0024] Figure 4 Structural schematic diagram of a power management circuit provided by an embodiment of the present application Figure 3 ;

[0025] Figure 5 Structural schematic diagram of a switching circuit provided by an embodiment of the present application Figure 2 ;

[0026] Figure 6 Structural schematic diagram of a switching circuit provided by an embodiment of the present application Figure 3 ;

[0027] Figure 7 Structural schematic diagram of a voltage regulating circuit provided by an embodiment of the present application;

[0028] Figure 8 Schematic diagram of the output voltage waveform of a charge pump generator provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following will describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0030] The terms used in the embodiments section of this application are only used to explain specific embodiments of this application and are not intended to limit this application. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application.

[0031] It should be noted that the terms "first", "second", etc. in the specification, claims and above-mentioned drawings of this application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. On the contrary, they are merely examples of devices and methods consistent with some aspects of this application as detailed in the appended claims.

[0032] Hereinafter, some terms in the embodiments of this application will be explained to facilitate understanding by those skilled in the art.

[0033] (1) In the embodiments of this application, the term "plurality" means two or more, and other quantifiers are similar.

[0034] (2) The switching tube in the embodiments of this application can be one or more of various types of switching tubes such as metal oxide semiconductor field effect transistor (MOSFET), bipolar junction transistor (BJT), insulated gate bipolar transistor (IGBT), etc. This application will not list them one by one. Each switching tube can include a first end, a second end and a control end. Among them, the control end is used to control the on or off of the switching tube. When the switching tube is on, current can be transmitted between the first end and the second end of the switching tube. When the switching tube is off, current cannot be transmitted between the first end and the second end of the switching tube. Taking MOSFET as an example, the control end of the switching tube is the gate, the first end of the switching tube can be the source, the second end can be the drain, or the first end can be the drain and the second end can be the source.

[0035] (3) In the embodiments of the present application, "connection" can be understood as electrical connection or communication connection. The electrical connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components. For example, for the connection between A and B, it can also be a direct connection between A and C and a direct connection between C and B, and the connection between A and B is achieved through C.

[0036] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. The power management circuit provided in the embodiments of the present application is connected to a power generation device, and can convert the voltage output by the power generation device into a supply voltage required by the device connected at the back end, so as to realize power supply for the load connected at the back end. Among them, the above-mentioned power generation device can be connected to a charge pump generator.

[0037] See Figure 1 As shown, it is a schematic structural diagram of a power management circuit provided in an embodiment of the present application. As Figure 1 shown, the power management circuit may include: a rectification circuit, a switching circuit, and a voltage regulation circuit.

[0038] Among them, the input end of the rectification circuit is used to be connected to the charge pump generator, and the output end of the rectification circuit is connected to the input end of the switching circuit; the first output end of the switching circuit is connected to the output end of the rectification circuit, and the second output end of the switching circuit is connected to the input end of the voltage regulation circuit. The switching circuit is used to control the connection between the input end of the switching circuit and the first output end of the switching circuit when the output voltage of the charge pump generator is less than the first set value or the output current of the charge pump generator is less than the second set value, and to control the connection between the input end of the switching circuit and the second output end of the switching circuit when the output voltage of the charge pump generator is greater than or equal to the first set value or the output current of the charge pump generator is greater than or equal to the second set value; the output end of the voltage regulation circuit is used to be connected to the load. Among them, the first set value and the second set value can be set according to the voltage value and current value when the voltage regulation circuit works normally, and no detailed introduction is made here in the present application.

[0039] It should be understood that Figure 1 the power management circuit structure shown is only an example. In actual application, the power management circuit may have more components than Figure 1 shown. For example, the power management circuit may further include an overload protection device and a short-circuit protection device. Of course, the power management circuit may also include other functional devices, and no more introduction is made here in the present application.

[0040] In actual application, the input end of the power management circuit can be externally connected to a charge pump generator, and the output end of the power management circuit can be externally connected to a load. That is, the charge pump generator can be connected to the load through the power management circuit. Therefore, the power management circuit can receive the electric energy generated by the charge pump generator, convert the electric energy generated by the charge pump generator into the supply voltage of the load, and control the supply time for the load.

[0041] See Figure 1 For the power management circuit shown, in the scenario where the charge pump generator is newly installed or frequently started, the amount of charge in the confinement electrode of the charge pump generator is insufficient, resulting in a low starting voltage amplitude of the charge pump generator and unable to meet the working conditions of the voltage regulation circuit. If the switching circuit is not configured, the circuit presents an open circuit state, and the charge pump generator cannot start normally all the time. The added switching circuit can short-circuit the output end of the rectifier circuit, enabling the confinement electrode of the charge pump generator to store charges normally, thereby increasing the charge density of the confinement electrode, and then rapidly increasing the output power of the charge pump generator, and further ensuring the rapid and smooth start of the charge pump generator.

[0042] Adopt Figure 1 For the power management circuit shown, when the charge pump generator is in the initial startup stage, its output power is low and unable to start the voltage regulation circuit. When the output voltage of the charge pump generator is less than the first set value or the output current is less than the second set value, it indicates that the current output of the charge pump generator cannot meet the working conditions of the voltage regulation circuit. The input end and the first output end of the switching circuit can be controlled to be connected, that is, the switching circuit short-circuits the output end of the rectifier circuit. At this time, charges can be stored in the confinement electrode of the charge pump generator through the rectifier circuit and the switching circuit. As the charge density in the confinement electrode increases, the power output by the charge pump generator gradually increases. When the output voltage of the charge pump generator is greater than or equal to the first set value or the output current is greater than or equal to the second set value, it indicates that the current output of the charge pump generator can meet the working conditions of the voltage regulation circuit. The input end and the second output end of the switching circuit can be controlled to be connected. The alternating current output by the circuit pump generator is rectified into direct current by the rectifier circuit and then output to the voltage regulation circuit. The voltage regulation circuit can convert the above electric energy into the power supply demand of the load and then output it to the load, thus ensuring the normal operation of the load.

[0043] In practical applications, the switching circuit can be composed of one or more switching devices. The above-mentioned one or more switching devices can all be electrically controlled switching devices, and the on and off of the electrically controlled switching devices are controlled by providing a voltage signal or a voltage signal with a corresponding level. The above-mentioned one or more switching devices can also be mechanical switching devices, and the operator can operate the state of the mechanical switching device according to the output voltage and output current of the charge pump generator. The working process of the power management circuit will be described in detail below in combination with the structures of the switching circuit and the voltage regulating circuit.

[0044] I. Switching Circuit

[0045] The switching circuit has an input terminal, a first output terminal, and a second output terminal. The input terminal of the switching circuit can be connected to the output terminal of the rectifying circuit, the first output terminal of the switching circuit is connected to the output terminal of the rectifying circuit, and the second output terminal of the switching circuit is connected to the input terminal of the voltage regulating circuit. When the input terminal of the switching circuit is connected to the first output terminal, the switching circuit is equivalent to a wire, directly connecting the output terminal of the rectifying circuit through the wire and short-circuiting the subsequent voltage regulating circuit. When the input terminal of the switching circuit is connected to the second output terminal, the switching circuit constitutes an electric energy transmission path between the rectifying circuit and the voltage regulating circuit.

[0046] In a possible implementation manner, the switching circuit can include a first switching transistor Q1. The first switching transistor is an electric controller. Refer to Figure 2 As shown, the first end of the first switching transistor Q1 is connected to the end of the rectifying circuit that outputs a high level and the voltage regulating circuit, and the second end of the first switching transistor Q1 is connected to the end of the rectifying circuit that outputs a low level.

[0047] Refer to Figure 2 As shown, in the scenario where the charge pump generator is newly installed or the charge pump generator starts frequently, the charge density in the confinement electrode of the charge pump generator is relatively low, so the output power of the charge pump generator is relatively low and cannot meet the working conditions of the voltage regulating circuit. The first switching transistor Q1 can be controlled to conduct. When the first switching transistor Q1 conducts, since the on-voltage drop of the first switching transistor Q1 is relatively low, ideally, it can be considered that the resistance on the branch where the first switching transistor Q1 is located is zero. Therefore, when the first switching transistor Q1 conducts, the voltage regulating circuit will be short-circuited, and the electric energy output by the charge pump generator is directly transmitted to the charge pump generator through the rectifying circuit and the first switching transistor Q1. This part of the charge can be stored in the confinement electrode of the charge pump generator, enhancing the charge density in the confinement electrode. As the generator rotates relative to each other, more charges are induced on the output electrode of the charge pump generator, resulting in an increase in the AC output power.

[0048] Continue to refer to Figure 2As shown, as the charge density in the confinement electrode of the charge pump generator gradually increases, the output power of the output electrode of the charge pump generator also becomes larger and larger. When the power output by the output electrode of the charge pump generator can meet the working conditions of the voltage regulation circuit, the first switching transistor Q1 can be controlled to turn off. At this time, the AC electrical energy output by the charge pump generator is rectified into DC electrical energy by the rectification circuit and then transmitted to the voltage regulation circuit, and after voltage regulation by the voltage regulation circuit, it supplies power to the load connected at the back end.

[0049] In some embodiments, the control terminal of the first switching transistor Q1 can be connected to a controller and is turned on and off by an electrical signal sent by the controller. That is, the power management circuit can also include a detection device and a controller. The detection device can detect the output voltage or output current of the charge pump generator and output the detected output voltage or output current to the controller. After receiving the above output voltage and output current, the controller sends an electrical signal of a corresponding level to the first switching transistor Q1 according to the amplitude of the output voltage or output current.

[0050] In some embodiments, the control terminal of the first switching transistor Q1 can be connected to a voltage dividing branch composed of resistors. Refer to Figure 3 As shown, the switching circuit can also include a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is connected to the charge pump generator, the second end of the first resistor R1 is connected to the control terminal of the first switching transistor Q1 and the first end of the second resistor R2. The second end of the second resistor R2 is grounded.

[0051] Refer to Figure 3 As shown, the first resistor R1 and the second resistor R2 are connected in series to form a voltage dividing branch. The voltage dividing branch is connected to the charge pump generator, and the middle node of the voltage dividing branch is connected to the control terminal of the first switching transistor Q1. When the charge pump generator outputs power, the output voltage of the charge pump generator passes through the above voltage dividing branch to provide a voltage Vg for the control terminal of the first switching transistor Q1. When the output power of the charge pump generator decreases, the voltage Vg provided by the voltage dividing branch for the control terminal of the first switching transistor Q1 is a low-level voltage signal, and the first switching transistor Q1 satisfies the conduction condition and conducts. When the output power of the charge pump generator increases and meets the working conditions of the voltage regulation circuit, the voltage Vg provided by the voltage dividing branch for the control terminal of the first switching transistor Q1 is a high-level signal voltage, and the first switching transistor Q1 turns off. Among them, the resistance values of the first resistor R1 and the second resistor R2 can be configured according to the model of the first switch Q1 and the voltage amplitude when the voltage regulation circuit works normally. There is no excessive limitation here in this application.

[0052] In an example, the above voltage dividing branch composed of resistors can also be connected to the output end of the rectification circuit. That is, the switching circuit also includes a third resistor R3 and a fourth resistor R4. Refer to Figure 4As shown, the first end of the third resistor R3 is connected to the end of the rectifier circuit that outputs a high level, and the second end of the third resistor R3 is connected to the control end of the first switching transistor Q1 and the first end of the fourth resistor R4; the second end of the fourth resistor R4 is grounded.

[0053] In some embodiments, the control end of the first switching transistor Q1 can be connected to a timer, and the timer is connected to the control end of the first switching transistor. The timer can start timing when the charge pump generator is operating, and when the timing duration reaches, it provides a high-level signal to the control end of the first switching transistor to drive the first switching transistor Q1 to turn off. Among them, the timing duration of the timer can be configured according to the increase amplitude of the output power of the charge pump generator when the first switching transistor Q1 is closed and the working conditions of the voltage regulating circuit, and this application will not introduce it in too much detail here.

[0054] It should be noted that the above introduction to the structure of the switching circuit is only an example, and the switching circuit can also use other functional devices to achieve the above functions. For example, the switching circuit can be composed of a mechanical switch.

[0055] In some embodiments, as shown in Figure 5 As shown, the mechanical switch in the switching circuit can be a push-button switch KT. The first end of the push-button switch KT is connected to the end of the rectifier circuit that outputs a high level and the input end of the voltage regulating circuit, and the second end of the push-button switch KT is connected to the end of the rectifier circuit that outputs a low level. The operator can press the above push-button switch KT after the charge pump generator starts, and control the push-button switch KT to reset when the output voltage of the charge pump generator is greater than or equal to the first set value or the output current is greater than or equal to the second set value.

[0056] In an example, a monitoring device is provided in the device where the power management circuit is located. The operator can determine the output voltage or output current of the charge pump generator through the monitoring device, and use the value detected by the monitoring device to control the reset moment of the push-button switch KT.

[0057] In another example, the operator can determine the duration when the output voltage of the charge pump generator is greater than or equal to the first set value or the output current is greater than or equal to the second set value after the charge pump generator starts according to the specifications of the charge pump generator, and use the above duration to control the reset moment of the push-button switch KT.

[0058] In some embodiments, as shown in Figure 6 As shown, the mechanical switch in the switching circuit is a single-pole double-throw switch K. The first end of the single-pole double-throw switch K is connected to the end of the rectifier circuit that outputs a high level, the second end of the single-pole double-throw switch K is connected to the input end of the voltage regulating circuit, and the third end of the single-pole double-throw switch K is connected to the end of the rectifier circuit that outputs a low level.

[0059] II. Voltage Regulating Circuit

[0060] The input end of the voltage regulating circuit is connected to the second output end of the switching circuit, and the output end of the voltage regulating circuit can be connected to a load. When the voltage regulating circuit is electrically connected to the rectifying circuit, it can adjust the voltage output by the rectifying circuit connected to the front end and convert it into the power supply voltage for the load connected to the back end, so as to supply power to the load.

[0061] In practical applications, the output voltage amplitude of the charge pump generator is relatively high and the output current amplitude is relatively low, and the output voltage amplitude cannot meet the power supply voltage requirements of the load connected to the back end. The voltage regulating circuit can adopt a buck circuit to convert the high-voltage and low-current electrical energy output by the charge pump generator into low-voltage and high-current electrical energy, so as to meet the power supply requirements of the load connected to the back end.

[0062] In practical applications, the buck circuit can adopt a circuit topology with the above functions that is commonly used in the industry. For example, see Figure 7 As shown, the buck circuit includes a gas discharge tube GDT, a diode D, an inductor L, and a capacitor C. The first end of the gas discharge tube GDT is connected to the second output end of the switching circuit, and the second end of the gas discharge tube GDT is respectively connected to the cathode of the diode D and the first end of the inductor L; the anode of the diode D is connected to the end of the rectifying circuit that outputs a low level; the second end of the inductor L is connected to the first end of the capacitor C; the second end of the capacitor C is connected to the anode of the diode D.

[0063] See Figure 7 As shown, when the output voltage of the charge pump generator is greater than the first set value, the first switching tube Q1 is turned off, and the output voltage of the rectifying circuit meets the starting voltage of the gas discharge tube GDT. The gas discharge tube GDT is started and transmits electrical energy to the back end. The buck circuit performs a buck operation and stores it in the capacitor C for storage for the use of the load connected to the back end.

[0064] It should be noted that the structure of the above voltage regulating circuit is only an example. The voltage regulating circuit can also adopt other buck topologies commonly used in the industry, and the buck circuit can also adopt other functional devices, such as overcurrent protection devices and short-circuit protection devices. There are no excessive limitations here in this application.

[0065] Combined with the above description, when the output power of the charge pump generator is too low to start the voltage regulating circuit, the switching circuit can be used to transmit electrical energy to the confinement electrode of the charge pump generator, which improves the electrical energy storage efficiency and further increases the rising speed of the output voltage of the charge pump generator. See Figure 8 As shown, it is the output voltage fluctuation diagram of the charge pump generator after configuring the switching circuit.

[0066] In actual application, all the devices in the power management circuit can be integrated on one device. The above device is configured with a power interface for connecting to a charge pump generator and a load interface for connecting to a load. The charge pump generator and the load can be connected to the power management circuit through the above interfaces. All the devices in the power management circuit can also be integrated with the charge pump generator on the same device. The above device is configured with a load interface for connecting to a load, and the load can be connected to the power management circuit through the above load interface.

[0067] Based on the above description, an embodiment of the present application further provides a power supply system, which may include a charge pump generator and the aforementioned power management circuit.

[0068] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. A power management circuit, characterized in that: Applied to a charge pump generator, the power management circuit comprises: a rectifier circuit, a switching circuit and a voltage regulating circuit; The input end of the rectifier circuit is used to be connected to the charge pump generator, and the output end of the rectifier circuit is connected to the input end of the switching circuit; The first output end of the switching circuit is connected to the output end of the rectifier circuit, and the second output end of the switching circuit is connected to the input end of the voltage regulating circuit. The switching circuit is used to control the input end of the switching circuit to be connected to the first output end of the switching circuit when the output voltage of the charge pump generator is less than a first set value or the output current of the charge pump generator is less than a second set value, and to control the input end of the switching circuit to be connected to the second output end of the switching circuit when the output voltage of the charge pump generator is greater than or equal to the first set value or the output current of the charge pump generator is greater than or equal to the second set value; The output end of the voltage regulating circuit is used to be connected to a load.

2. The circuit according to claim 1, characterized in that The switching circuit includes a first switch tube, a first end of the first switch tube is connected to an end of the rectifier circuit outputting a high level and an input end of the voltage regulating circuit, and a second end of the first switch tube is connected to an end of the rectifier circuit outputting a low level.

3. The circuit according to claim 2, characterized in that The power management circuit also includes a first resistor and a second resistor; The first end of the first resistor is connected to the charge pump generator, and the second end of the first resistor is connected to the control end of the first switch tube and the first end of the second resistor; A second terminal of the second resistor is grounded.

4. The circuit according to claim 2, characterized in that The power management circuit further includes a third resistor and a fourth resistor; The first end of the third resistor is connected to the end of the rectifier circuit outputting a high level, and the second end of the third resistor is connected to the control end of the first switch tube and the first end of the fourth resistor; A second end of the fourth resistor is grounded.

5. The circuit according to claim 2, characterized in that The power management circuit also includes a timer, and the timer is connected to the control end of the first switch tube.

6. The circuit according to claim 1, characterized in that The switching circuit includes a single-pole double-throw switch, a first end of the single-pole double-throw switch is connected to an end of the rectifier circuit that outputs a high level, a second end of the single-pole double-throw switch is connected to an input end of the voltage regulating circuit, and a third end of the single-pole double-throw switch is connected to an end of the rectifier circuit that outputs a low level.

7. The circuit according to claim 1, characterized in that The switching circuit includes a button switch, a first end of the button switch is connected to an end of the rectifier circuit outputting a high level and an input end of the voltage regulating circuit, and a second end of the button switch is connected to an end of the rectifier circuit outputting a low level.

8. The circuit according to any one of claims 1 to 7, characterized in that: The voltage regulating circuit is a step-down circuit.

9. The circuit according to claim 8, characterized in that The step-down circuit comprises: a gas discharge tube, a diode, an inductor and a capacitor; The first end of the gas discharge tube is connected to the second output end of the switching circuit, and the second end of the gas discharge tube is connected to the cathode of the diode and the first end of the inductor respectively; The anode of the diode is connected to the end of the rectifier circuit outputting a low level; The second end of the inductor is connected to the first end of the capacitor; The second end of the capacitor is connected to the anode of the diode.

10. A power supply system, characterized in that: include: A charge pump generator and a power management circuit as claimed in any one of claims 1 to 9.

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