Power supply device and electronic equipment

Abstract

A power supply device and an electronic device are used for improving the power supply stability of a load and reducing the power supply cost of the load. The power supply device comprises a rectifier, a first energy storage capacitor and a power supply control circuit. The input end of the rectifier is used for being connected with a power generation device, and the output end of the rectifier is connected with the first energy storage capacitor and used for receiving alternating-current electric energy output by the power generation device, converting the alternating-current electric energy into direct-current electric energy and outputting the direct-current electric energy to the first energy storage capacitor for storage. And the power supply control circuit is connected with the first energy storage capacitor, and is used for outputting a high-level voltage signal to supply power to the load when the voltage at the two ends of the first energy storage capacitor is greater than or equal to a first preset threshold value, and stopping supplying power to the load when the voltage at the two ends of the first energy storage capacitor is less than or equal to a second preset threshold value.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a power supply device and an electronic device. Background Art

[0002] The rapid development of global informatization has promoted the popularization of various smart devices, especially in the field of the Internet of Things, where information life is gradually moving towards a new era of greater intelligence and convenience. In this process, sensor devices, as one of the core components of the Internet of Things, undertake the key tasks of data collection and transmission.

[0003] At present, the power supply of sensors mainly adopts power supply from the grid or charging of chemical batteries. With the large-scale deployment of IoT devices in various scenarios, especially in complex urban environments, remote areas or special places where wiring is difficult, the power supply mode of the grid is extremely inconvenient. Chemical batteries need to be replaced or charged regularly, which increases the complexity of maintenance and also brings huge risks of environmental pollution. Based on the above situation, the industry has proposed to use self-produced friction nanogenerators as the power supply source of sensors, but the electric energy generated by the nanogenerator is discontinuous and the amplitude is unstable, so the power supply method of the sensor needs to be further optimized. Summary of the invention

[0004] The present application provides a power supply device and an electronic device for improving the power supply stability of a load and reducing the power supply cost of the load.

[0005] In a first aspect, an embodiment of the present application provides a power supply device, which can power sensors in the Internet of Things, or loads in other scenarios where it is inconvenient to install power supply lines. The power supply device may include: a rectifier, a first energy storage capacitor, and a power supply control circuit.

[0006] Among them, the input end of the rectifier is used to connect with the power generation device, and the output end of the rectifier is connected to the first energy storage capacitor, which is used to receive the AC power output by the power generation device, convert the AC power into DC power and output it to the first energy storage capacitor for storage; the power supply control circuit is connected to the first energy storage capacitor, and is used to output a high-level voltage signal to power the load when the voltage across the first energy storage capacitor is greater than or equal to a first preset threshold, and stop powering the load when the voltage across the first energy storage capacitor is less than or equal to a second preset threshold.

[0007] With the above design, the rectifier converts the AC power generated by the power generation device into the DC power required for the back-end power supply. For the case where the power supply of the power generation device is unstable, the first energy storage capacitor can store the scattered power generated by the power generation device, thereby providing a guarantee for the stable power supply of the load. For the unstable power supply amplitude of the power generation device, for example, when the output power supply voltage amplitude does not meet the power supply demand of the load, the load will not work, but this part of the power is still output to the load, causing the static power consumption of the load to increase. The power supply control circuit can supply power to the load only after the voltage amplitude of the output voltage meets the requirements, and stop supplying power to the load when it does not meet the requirements, and store the power to the first energy storage capacitor to provide sufficient power for the next power supply.

[0008] In a possible design, the power supply control circuit includes: a first resistor, a first voltage-stabilizing diode, a second energy storage capacitor, a second resistor, a third resistor and a comparator.

[0009] Among them, the first end of the first resistor is connected to the first end of the first energy storage capacitor, and the second end of the first resistor is connected to the cathode of the first voltage regulator diode and the first end of the second energy storage capacitor; the cathode of the first voltage regulator diode is connected to the first input end of the comparator, and the anode of the first voltage regulator diode is connected to the second end of the second energy storage capacitor and the second end of the first energy storage capacitor; the first end of the second resistor is connected to the first end of the first energy storage capacitor, and the second end of the second resistor is connected to the first end of the third resistor and the second input end of the comparator; the second end of the third resistor is connected to the output end of the comparator; the output end of the comparator is used to be connected to the load.

[0010] With the above design, as the charging time of the first energy storage capacitor increases, the voltage across the first energy storage capacitor gradually increases. When the voltage of the first energy storage capacitor is charged to the first preset threshold required for powering the load, the voltage provided by the second resistor and the third resistor in series for the first input terminal of the comparator will be greater than the voltage provided by the second energy storage capacitor for the first input terminal of the comparator, and the comparator meets the condition to output a high-level signal and power the load connected to the output terminal. After the first energy storage capacitor has powered on for a period of time, the voltage across the first energy storage capacitor decreases, but the comparator outputs a high level to increase the potential of the first input terminal of the comparator, and the first energy storage capacitor can still power the load through the comparator. As the power supply time of the first energy storage capacitor increases, the voltage across the first energy storage capacitor becomes lower and lower. When the voltage across the first energy storage capacitor is less than the second preset threshold, the voltage after the second resistor and the third resistor are connected in series for the voltage division is less than the voltage amplitude of the second energy storage capacitor, and the comparator outputs a low-level signal to stop powering the load to reduce the static power consumption of the load, and the first energy storage capacitor re-stores the electrical energy required for the next power supply of the load.

[0011] In one possible design, the first energy storage capacitor supplies power to the comparator.

[0012] In one possible design, if the voltage amplitude output by the power generation device is too high or too low, in order to ensure power supply safety, the power supply device also includes a voltage regulating circuit connected between the output end of the rectifier and the first energy storage capacitor, which can convert the voltage output by the rectifier into a supply voltage for the load.

[0013] In a possible design, taking the power generation device as a nanogenerator as an example, the voltage amplitude output by the nanogenerator is much larger than the power supply device of the load, and the voltage regulating circuit can be a step-down circuit.

[0014] In a possible design, the voltage regulation circuit includes a switch module, a first voltage regulator diode and a first inductor.

[0015] Among them, the first end of the switch module is connected to the end of the rectifier outputting a high level, and the second end of the switch module is connected to the cathode of the first diode and the first end of the first inductor; the anode of the first diode is connected to the end of the rectifier outputting a low level and the second end of the first energy storage capacitor; the second end of the first inductor is connected to the first end of the first energy storage capacitor.

[0016] In a possible design, the switch module includes a thyristor and a second zener diode.

[0017] The first end of the thyristor is connected to the end of the rectifier outputting a high level, and the second end of the thyristor is connected to the first end of the first inductor; the cathode of the second voltage stabilizing diode is connected to the first end of the thyristor, and the anode of the second voltage stabilizing diode is connected to the control end of the thyristor. With the above design, when the rectifier has electrical energy output, the second voltage stabilizing diode breaks down to turn on the thyristor, and the thyristor turns on to output the electrical energy of the rectifier to the first inductor and the first energy storage capacitor at the rear end.

[0018] In one possible design, the rectifier includes an uncontrollable full-bridge rectifier circuit and a third energy storage capacitor, the uncontrollable full-bridge rectifier circuit and the third energy storage capacitor are connected in series, the input end of the uncontrollable full-bridge rectifier circuit is the input end of the rectifier, and the third energy storage capacitor is the output end of the rectifier.

[0019] In a possible design, the power generation device is a nanogenerator or a piezoelectric generator.

[0020] In a second aspect, an embodiment of the present application provides an electronic device, which may include a load and a power supply device as provided in the first aspect of the present application and any possible design thereof.

[0021] In addition, the technical effects brought about by the second aspect and any possible design thereof can refer to the technical effects brought about by the different designs in the first aspect of the embodiment of the present application, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 A schematic diagram of a power supply device provided in an embodiment of the present application Figure 1 ;

[0024] Figure 2 A schematic diagram of a power supply device provided in an embodiment of the present application Figure 2 ;

[0025] Figure 3 A schematic diagram of a power supply control circuit provided in an embodiment of the present application;

[0026] Figure 4 A schematic diagram of power transmission of a power supply control circuit provided in an embodiment of the present application Figure 1 ;

[0027] Figure 5 A schematic diagram of power transmission of a power supply control circuit provided in an embodiment of the present application Figure 2 ;

[0028] Figure 6 A schematic diagram of a voltage regulating circuit provided in an embodiment of the present application;

[0029] Figure 7 A schematic diagram of the structure of a rectifier provided in an embodiment of the present application;

[0030] Figure 8 A schematic diagram of power transmission output of a power generation device provided in an embodiment of the present application Figure 1 ;

[0031] Fig. 9 A schematic diagram of power transmission output of a power generation device provided in an embodiment of the present application Figure 2 ;

[0032] Fig.10 A schematic diagram of fluctuation of a power supply voltage of a power supply device provided in an embodiment of the present application;

[0033] Fig.11A schematic diagram of the corresponding relationship between the power supply duration of a power supply device and the load power supply power provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The application scenarios of the technical solutions in the embodiments of the present application will be introduced below in conjunction with the drawings in the embodiments of the present application.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0036] In the embodiments of the present application, the term "multiple" refers to two or more than two, and other quantifiers are similar. In the embodiments of the present application, "connection" can be understood as electrical connection or communication connection. The electrical connection of two electrical components can be a direct or indirect connection between the two electrical components. For example, A and B are connected, which can be either A and B directly connected, or A and B indirectly connected through one or more other electrical components, such as A and B are connected, or A and C are directly connected, C and B are directly connected, and A and B are connected through C. The communication connection between two electrical components is a wireless connection between the two electrical components, that is, the two electrical components are electromagnetically connected.

[0037] The power supply device provided in the embodiment of the present application may be used in power supply scenarios where the power supply line is inconvenient to install and self-produced electrical components need to be configured, and the above power supply scenarios are not limited to: Internet of Things devices, wireless sensor networks and portable electronic devices. In order to facilitate the understanding of the solution of the present application, the following is an example of sensor power supply in an Internet of Things device.

[0038] See also Figure 1 As shown, it is a schematic diagram of a structure of a power supply device provided in an embodiment of the present application. Figure 1 As shown, the power supply device includes: a rectifier, a first energy storage capacitor C1 and a power supply control circuit.

[0039] Among them, the input end of the rectifier is used to connect with the power generation device, and the output end of the rectifier is connected to the first energy storage capacitor C1, which is used to receive the AC power output by the power generation device, convert the AC power into DC power and output it to the first energy storage capacitor C1 for storage; the power supply control circuit is connected to the first energy storage capacitor C1, and is used to output a high-level voltage signal to power the load when the voltage across the first energy storage capacitor C1 is greater than or equal to a first preset threshold, and stop powering the load when the voltage across the first energy storage capacitor C1 is less than or equal to a second preset threshold.

[0040] It should be understood that Figure 1 The power supply shown is only an example and the power supply may have a Figure 1 More components shown in , for example, overcurrent protection devices and short-circuit protection devices may also be configured in the power supply device. Figure 1 The various components shown in the EMBODIMENTS 2000 may be implemented in hardware, software, or a combination of hardware and software, including one or more signal processing and / or application specific integrated circuits.

[0041] use Figure 1 The power supply device structure shown, when the electric energy generated by the power generation device is used to power the load, the electric energy generated by the power generation device is rectified into direct current by the rectifier, and then transmitted to the first energy storage capacitor C1 for storage, so that the first energy storage capacitor C1 can continuously provide the load with the electric energy required for power supply. As the number of times and the charging time of the first energy storage capacitor C1 increase, the voltage across the first energy storage capacitor C1 increases accordingly. When the voltage of the first energy storage capacitor C1 meets the first preset threshold, the power supply control circuit works to output the high-level voltage signal required for the load power supply, and uses the high-level voltage signal to power the load. As the power supply time increases, the voltage across the first energy storage capacitor C1 gradually decreases. When the voltage across the first energy storage capacitor C1 drops to the second preset threshold, in order to ensure the safety of the load operation, the power supply control circuit stops supplying power to the load to reduce the static power consumption of the load and improve the utilization rate of electric energy. At this time, the first energy storage capacitor C1 re-stores the electric energy required for the next power supply of the load. Among them, the first preset threshold and the second preset threshold can be the maximum value and minimum value of the load power supply interval, respectively.

[0042] In practical applications, if a nanogenerator is used as a power generation device and the load is a sensor, since the supply voltage of the sensor is small, and the output voltage of the nanogenerator is much greater than the supply voltage requirement of the sensor, in order to ensure the safety of the sensor, see Figure 2 As shown, the power supply device provided in the embodiment of the present application may also include a voltage regulating circuit connected between the rectifier and the first energy storage capacitor C1, which can convert the voltage output by the rectifier into the voltage required by the load and output the electrical energy to the first energy storage capacitor C1 for storage.

[0043] In practical applications, the power supply device can be fixed on the same device as the power generation device and the load. In another implementation, the power supply device can also be set in a flexible and detachable form, that is, the power supply device is provided with an external interface, and the power generation device and the load can be electrically connected to the power supply device through the above interface of the power supply device. In this case, the power supply device can be regarded as a device independent of the power generation device and the load.

[0044] In one example, if the power supply device is a device independent of the power generation device and the load, multiple devices in the power supply device can be placed on the same printed circuit board (PCB), and the PCB can be provided with a first connector for connecting to the power generation device and a second connector for connecting to the load. The power supply device can obtain the electric energy output by the power generation device through the first connector, and supply power to the load through the second connector.

[0045] Next, the working process of the power supply device is described in combination with the structures of various components in the power supply device.

[0046] 1. Power supply control circuit

[0047] The input end of the power supply control circuit can be connected to the first energy storage capacitor C1, and the output end of the power supply control circuit can be connected to the load. The power supply control circuit controls the time of supplying power to the load according to the voltage amplitude across the first energy storage capacitor C1.

[0048] Specifically, the power supply control circuit can output a high-level voltage signal to supply power to the load when the voltage across the first energy storage capacitor C1 is greater than or equal to the first preset threshold. The power supply control circuit can also stop supplying power to the load to reduce the static power consumption of the load when the voltage across the first energy storage capacitor C1 is less than or equal to the second preset threshold, and store the electric energy generated at this time on the first energy storage capacitor C1 to provide the required electric energy for the next power supply to the load. Among them, the first preset threshold and the second preset threshold can be configured according to the power supply voltage requirement of the load. Below, the first preset threshold is 3.3V and the second preset threshold is 2.5V as an example for explanation.

[0049] In one possible implementation, see Figure 3 As shown, the power supply control circuit includes: a first resistor R1, a first voltage stabilizing diode Z1, a second energy storage capacitor C2, a second resistor R2, a third resistor R3 and a comparator U.

[0050] Specifically, the first end of the first resistor R1 is connected to the first end of the first energy storage capacitor C1, and the second end of the first resistor R1 is connected to the cathode of the first voltage stabilizing diode Z1 and the first end of the second energy storage capacitor C2; the cathode of the first voltage stabilizing diode Z1 is connected to the first input end of the comparator U, and the anode of the first voltage stabilizing diode Z1 is connected to the second end of the second energy storage capacitor C2 and the second end of the first energy storage capacitor C1; the first end of the second resistor R2 is connected to the first end of the first energy storage capacitor C1, and the second end of the second resistor R2 is connected to the first end of the third resistor R3 and the second input end of the comparator U; the second end of the third resistor R3 is connected to the output end of the comparator U; and the output end of the comparator U is connected to the load. Among them, the first input end of the comparator U is the inverting input end, the second input end of the comparator U is the non-inverting input end, the power supply end of the comparator U is connected to the first end of the first energy storage capacitor C1, and the ground end of the comparator U is connected to the second end of the first energy storage capacitor C1.

[0051] use Figure 3 When the power supply control circuit shown in the figure supplies power to the load, if the voltage across the first energy storage capacitor C1 is less than the first preset threshold value 3.3V, the power transmission direction of the first energy storage capacitor C1 can be seen in FIG. Figure 4 As shown, the electric energy of the first energy storage capacitor C1 is supplied to the second energy storage capacitor C2 through the first resistor R1, so that the second energy storage capacitor C2 provides a stable reference voltage Cref for the inverting input terminal of the comparator U. The electric energy of the first energy storage capacitor C1 is also charged for the load equivalent capacitor Cp (not shown) on the output side through the second resistor R2 and the third resistor R3. If the voltage across the first energy storage capacitor C1 is less than the first preset threshold value 3.3V, the voltage V+ provided to the positive input terminal of the comparator U after the second resistor R2, the third resistor R3 and the load are connected in series and divided is less than the reference voltage Vref, and the comparator outputs a low-level voltage signal, thereby achieving high-resistance isolation between the first energy storage capacitor C1 and the load, reducing the static loss of the load, and storing most of the electric energy in the first energy storage capacitor C1 to avoid electric energy waste. When the voltage across the first energy storage capacitor C1 is greater than the first preset threshold value 3.3V, the direction of electric energy transmission of the first energy storage capacitor C1 can be seen in Figure 5 As shown, the voltage of the first energy storage capacitor C1 is provided to the positive input terminal voltage V+ of the comparator U after being divided in series by the second resistor R2, the third resistor R3 and the load. The voltage is greater than the reference voltage Vref provided by the second energy storage capacitor C2 to the inverting input terminal of the comparator U, and the comparator U outputs a high-level signal to power the load.

[0052] Continue to see Figure 5As shown, the series voltage-dividing branch formed by the second resistor R2, the third resistor R2 and the load provides a voltage for the positive input terminal of the comparator U. When the comparator U outputs a high-level voltage signal for the load, the potential of the voltage V+ at the positive input terminal of the comparator U increases. Therefore, even if the voltage across the first energy storage capacitor C1 decreases with the power supply, the voltage V+ at the positive input terminal of the comparator U can be greater than the reference voltage Vref, so that the comparator U can maintain power supply for a period of time. As the power supply time increases, the voltage across the first energy storage capacitor C1 becomes lower and lower. When the voltage across the first energy storage capacitor C1 is less than the second preset threshold value of 2.5V, the voltage V+ after the series voltage division of the second resistor R2, the third resistor R3 and the load cannot meet the requirement of being greater than the reference voltage Vref, then the comparator U outputs a low-level voltage signal to stop power supply, and the electric energy generated by the power generation device continues to be stored in the first energy storage capacitor C1, thereby providing electric energy for the next power supply of the load. Therefore, the above-mentioned power supply control circuit can be used to maintain power supply for a period of time after the voltage of the first energy storage capacitor C1 fluctuates, so as to improve the power supply time and power supply stability.

[0053] 2. Voltage regulation circuit

[0054] The voltage regulating circuit is connected between the output end of the rectifier and the first energy storage capacitor C1, and the voltage regulating circuit is used to convert the voltage output by the rectifier into the charging voltage of the first energy storage capacitor C1, so as to realize the safe charging of the first energy storage capacitor C1. The voltage regulating circuit can be a boost circuit or a buck circuit, and its specific type can be configured according to the output voltage of the rectifier and the charging voltage of the first energy storage capacitor C1. In order to facilitate the understanding of the scheme of the present application, the power generation device is a nano generator, and the voltage regulating circuit is a buck circuit.

[0055] In actual application, the voltage regulating circuit may adopt a buck circuit topology, thereby converting the high voltage, low level signal output by the rectifier into a low voltage, high current signal and transmitting it to the first energy storage capacitor C1 for storage.

[0056] In one possible implementation, see Figure 6 As shown, the voltage regulating circuit may include a switch module, a first diode D1 and a first inductor L. The first end of the switch module is connected to an end of the rectifier outputting a high level, and the second end of the switch module is connected to the cathode of the first diode D1 and the first end of the first inductor L1; the anode of the first diode D1 is connected to an end of the rectifier outputting a low level and the second end of the first energy storage capacitor C1; the second end of the first inductor L1 is connected to the first end of the first energy storage capacitor C1.

[0057] In actual application, since the power supply of the power supply device is a self-generated power generation device, in order to avoid the situation where the controller cannot trigger the driving signal due to power failure when the rectifier adopts a controllable switch tube, the rectifier generally adopts an uncontrollable diode. Therefore, the voltage regulation circuit can include a switch module that can be configured in a combination of a semi-controlled switch device and a voltage regulator diode to control the electrical connection between the first inductor L1 and the rectifier.

[0058] In one example, see Figure 6 As shown, the switch module includes a thyristor S and a second voltage stabilizing diode Z2. The first end of the thyristor S is connected to the end of the rectifier outputting a high level, and the second end of the thyristor S is connected to the first end of the first inductor L1; the cathode of the second voltage stabilizing diode Z2 is connected to the first end of the thyristor S, and the anode of the second voltage stabilizing diode Z2 is connected to the control end of the thyristor S.

[0059] use Figure 6 In the switch module structure shown, when the power generation device generates electricity and outputs it through the rectifier, the second voltage regulator diode Z2 breaks down to provide a high-level voltage signal to the control end of the thyristor S, and the thyristor S is turned on to transmit the electric energy output by the rectifier to the first inductor L1 and the first energy storage capacitor C1 at the rear end for storage. Since the thyristor S is a semi-controlled switch device, during the transmission of the electric energy generated by the power generation device, the current flowing through the thyristor S gradually decreases. When the current flowing through the thyristor S is below the holding current, the thyristor S automatically turns off. The first inductor L1 generates an induced electromotive force, and charges the first energy storage capacitor C1 through a closed loop formed by the first energy storage capacitor C1 and the first diode D1.

[0060] 3. Rectifier

[0061] The input end of the rectifier can be connected to the power input end of the power generation device, and the output end of the rectifier can be directly connected to the first energy storage capacitor C1 or connected to the first energy storage capacitor C1 through a voltage regulating circuit. Generally, the power output of power generation devices such as nanogenerators or piezoelectric generators is AC power, and the power required for load power supply is DC power. In order to meet the power supply requirements of the load, the rectifier can convert the AC power output of the power generation device into DC power.

[0062] In actual use, if the converted DC power can meet the charging requirements of the first energy storage capacitor C1 and the power supply requirements of the load, the power output by the rectifier is directly transmitted to the first energy storage capacitor C1. If the converted DC power does not meet the charging requirements of the first energy capacitor C1 and the power supply requirements of the load, the power output by the rectifier is regulated by the voltage regulating circuit to meet the power supply requirements and then transmitted to the first energy storage capacitor C1.

[0063] In practical application, the rectifier can be a combination of a full-bridge rectifier circuit and a third energy storage capacitor C3, the full-bridge rectifier circuit and the third energy storage capacitor C3 are connected in series, the input end of the full-bridge rectifier circuit is the input end of the rectifier, and the third energy storage capacitor C3 is the output end of the rectifier. The full-bridge rectifier circuit can be a full-bridge rectifier circuit composed of fully controlled switching devices, or a full-bridge rectifier circuit composed of uncontrollable switching devices.

[0064] It should be noted that since the power supply of the power supply circuit is a self-generated power generation device, it has the problem that the output power is unstable, which makes the control difficult, and the power supply voltage of the first energy storage capacitor C1 is low, which makes the control device unable to trigger the driving signal of the switch device. Figure 7 As shown, the rectifier provided in the embodiment of the present application preferably uses uncontrollable switching devices.

[0065] use Figure 7 The rectifier structure shown in the figure, when the power generating device has power output, the power transmission direction of the power generating device can be seen in Figure 8 As shown, the electric energy output by the power generation device is rectified and output by the rectifier, triggering the second voltage stabilizing diode Z2 to break down. The second voltage stabilizing diode Z2 breaks down and triggers the thyristor S to turn on, which transmits the electric energy output by the power generation device to the first inductor L1 and the first energy storage capacitor C1 for storage. When the current on the line decreases, the direction of electric energy transmission of the power generation device can be seen in Fig. 9 As shown, the thyristor S is turned off, and the first inductor L1 outputs the stored electric energy to the first energy storage capacitor C1 for storage.

[0066] The above is an introduction to the power supply device provided in the embodiment of the present application using the electric energy output by the power generation device to stably supply power to the load. It can be seen from the above content that the electric energy output by the power generation device will be transmitted to the first energy storage capacitor C1 for storage. When the voltage of the first energy storage capacitor C1 meets the first preset threshold value of 3.3V, the comparator U outputs a high-level voltage signal to supply power to the load. As the power supply time increases, when the voltage across the first energy storage capacitor C1 drops to the second preset threshold value of 2.5V, the comparator U outputs a low-level voltage signal to stop supplying power to the load. The voltage fluctuation of the output voltage after the power supply device in the embodiment of the present application is connected to the load can be seen in Fig.10 shown.

[0067] In actual application, the power supply device provided in the embodiment of the present application can be connected to different loads and meet the requirements of different loads for power supply voltage. Since the ability of the first energy storage capacitor C1 to store electric energy is limited, when the power supply power of the connected load is small, the power supply device supplies power to the load for a longer time. When the power supply power of the connected load is small, the power supply device supplies power to the load for a shorter time. Fig.11As shown in FIG. 1 , it is a schematic diagram of the corresponding relationship between the power supply duration of the power supply device and the load power supply power when the load has different resistance values. Fig.11 As shown, based on the power calculation formula P = U 2 / R It can be seen that when the output power of the power supply device is relatively stable, the larger the resistance of the load is, the smaller the power supply power of the load is, and the corresponding power supply time is longer.

[0068] In combination with the above description, an embodiment of the present application further provides an electronic device, which may include a load and the power supply device as described above.

[0069] In actual application, the electronic device may be a portable terminal, and the load may be a plurality of functional sensors provided in the terminal. The power supply device described above in the present application is used to power the plurality of sensors of the terminal.

[0070] It should be noted that the portable electronic device is only an application example of the power supply device. In actual use, the power supply device can also be applied to other scenarios that require power supply from self-generating devices. This application does not give examples one by one here.

[0071] It should be noted that the process of the power supply device using the electric energy output by the self-generating device to power the load can be found in the aforementioned related introduction, and this application will not repeat it here.

[0072] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0073] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of protection 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 equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A power supply device, characterized in that: include: A rectifier, a first energy storage capacitor and a power supply control circuit; The input end of the rectifier is used to connect to the power generation device, and the output end of the rectifier is connected to the first energy storage capacitor, and is used to receive the AC power output by the power generation device, convert the AC power into DC power, and output it to the first energy storage capacitor for storage; The power supply control circuit is connected to the first energy storage capacitor, and is used to output a high-level voltage signal to power the load when the voltage across the first energy storage capacitor is greater than or equal to a first preset threshold, and to stop powering the load when the voltage across the first energy storage capacitor is less than or equal to a second preset threshold.

2. The power supply device according to claim 1, characterized in that: The power supply control circuit comprises: a first resistor, a first voltage stabilizing diode, a second energy storage capacitor, a second resistor, a third resistor and a comparator; The first end of the first resistor is connected to the first end of the first energy storage capacitor, and the second end of the first resistor is connected to the cathode of the first voltage stabilizing diode and the first end of the second energy storage capacitor; The cathode of the first voltage stabilizing diode is connected to the first input terminal of the comparator, and the anode of the first voltage stabilizing diode is connected to the second terminal of the second energy storage capacitor and the second terminal of the first energy storage capacitor; The first end of the second resistor is connected to the first end of the first energy storage capacitor, and the second end of the second resistor is connected to the first end of the third resistor and the second input end of the comparator; The second end of the third resistor is connected to the output end of the comparator; The output terminal of the comparator is used to be connected to the load.

3. The power supply device according to claim 2, characterized in that: The first energy storage capacitor supplies power to the comparator.

4. The power supply device according to claim 1, characterized in that: The power supply device also includes a voltage regulating circuit connected between the output end of the rectifier and the first energy storage capacitor.

5. The power supply device according to claim 4, characterized in that: The voltage regulating circuit is a step-down circuit.

6. The power supply device according to claim 5, characterized in that: The voltage regulating circuit comprises: a switch module, a first diode and a first inductor; The first end of the switch module is connected to an end of the rectifier outputting a high level, and the second end of the switch module is connected to the cathode of the first diode and the first end of the first inductor; The anode of the first diode is connected to an end of the rectifier outputting a low level and a second end of the first energy storage capacitor; The second end of the first inductor is connected to the first end of the first energy storage capacitor.

7. The power supply device according to claim 6, characterized in that: The switch module comprises: a thyristor and a second voltage stabilizing diode; The first end of the thyristor is connected to the end of the rectifier outputting a high level, and the second end of the thyristor is connected to the first end of the first inductor; The cathode of the second voltage stabilizing diode is connected to the first end of the thyristor, and the anode of the second voltage stabilizing diode is connected to the control end of the thyristor.

8. The power supply device according to claim 1, characterized in that: The rectifier includes an uncontrollable full-bridge rectifier circuit and a third energy storage capacitor, the uncontrollable full-bridge rectifier circuit and the third energy storage capacitor are connected in series, the input end of the uncontrollable full-bridge rectifier circuit is the input end of the rectifier, and the third energy storage capacitor is the output end of the rectifier.

9. The power supply device according to claim 1, characterized in that: The power generation device is a nanogenerator or a piezoelectric generator.

10. An electronic device, characterized in that: The invention comprises a load and a power supply device as claimed in any one of claims 1 to 9.

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