Energy supply device and dosimeter

Abstract

The invention discloses an energy supply device and a dosimeter, and relates to the technical field of dosimeter design, the energy supply device can adopt an energy collector and a micro energy collection management circuit to complete collection and storage of micro energy of an indoor light source collected and converted by a solar panel or micro energy such as thermoelectricity and the like, and can supply energy to the dosimeter. The power supply device can supply power to some dosimeter equipment which is inconvenient to supply power and needs long-term unattended operation, and particularly can supply power to dosimeter equipment which cannot be conveniently supplemented by field monitoring and throwing type dosimeter equipment, so that long-term stable operation of the dosimeter equipment is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of dosimeter design, and in particular to an energy replenishment device and a dosimeter capable of collecting environmental micro-energy to supplement energy supply. Background Art

[0002] Dosimeters are widely used in environmental monitoring, radiation protection and other fields. In recent years, various types of throw-type and spread-type dose monitoring instruments have been developed, which can monitor the dose information of the target area more safely and conveniently, and provide a basis for early warning, planning or disposal for relevant personnel. However, most dosimeter equipment still does not solve the key problem of power supply, which affects the working life of the equipment. At present, most dosimeters are powered by alkaline batteries or rechargeable lithium batteries. The batteries need to be replaced or charged regularly, which makes the equipment have problems with battery life and power replenishment when the equipment is not charged in time or it is difficult to replenish the power in the field.

[0003] At present, most dosimeters are developed and designed by mainly selecting low-power components, using larger capacity batteries, optimizing the software level and other methods to reduce the power consumption of the equipment. These methods can extend the working time of the equipment to a certain extent, but the power of the equipment is not actually replenished, and the battery of the instrument needs to be replaced or charged regularly. For some dosimeter equipment with inconvenient power supply and long-term unattended operation, especially field monitoring and casting type dosimeter equipment that cannot be conveniently replenished with power, these methods cannot replenish the power of the equipment and still cannot keep the equipment in working condition for a long time without human intervention.

[0004] Collecting environmental energy and converting it into usable electrical energy has received widespread attention in recent years. By collecting micro-energy such as light energy, heat energy, vibration energy and radio frequency energy in the environment, it can be converted into usable electrical energy and continuously replenish power for the device, so that the device can operate stably for a long time without human intervention, and provide continuous power replenishment for the dosimeter device. This method provides a solution for the power supply of small dosimeter equipment and has obvious advantages in some scenarios where traditional power supplies cannot be used.

[0005] Therefore, how to use energy collection and micro-energy in the environment to power a dosimeter to ensure long-term stable operation of dosimeters such as the throwing type that have inconvenient power supply is a technical problem that urgently needs to be solved by technical personnel in this field. Summary of the invention

[0006] In view of the above problems, the present invention provides an energy replenishment device and a dosimeter for overcoming the above problems or at least partially solving the above problems, thereby solving the problems of battery life and power replenishment of dosimeter equipment in the existing methods.

[0007] The present invention provides the following scheme:

[0008] An energy replenishing device, comprising:

[0009] An energy harvesting unit, the energy harvesting unit comprising a connected energy harvester and an energy harvesting management circuit, the energy harvesting management circuit being used to extract and manage target electrical energy in the microwatt to milliwatt range from the energy harvester;

[0010] an energy storage unit, wherein the energy storage unit is used to store the target electric energy;

[0011] The buck-boost conversion unit is used to perform an initial DC-DC buck conversion on the electric energy output by the energy storage unit to obtain a +3 volt low-voltage power supply, a part of which is used to provide a working voltage for the system low-voltage circuit, and another part of which is subjected to a second DC-DC boost conversion and voltage stabilization to obtain a +30 volt high-voltage power supply to provide a bias voltage for the detector module.

[0012] Preferably, the energy storage unit includes a supercapacitor, a backup battery, or a combination of the two.

[0013] Preferably: the energy storage unit comprises a supercapacitor and a backup battery connected in parallel;

[0014] The energy collection management circuit controls the supercapacitor or the backup battery to output electric energy through a dual PMOS power switching circuit according to the voltage state between the charging completion threshold, the hysteresis threshold and the supercapacitor.

[0015] Preferably: the power switching circuit follows a break-before-make logic to prevent the new and old signal paths from being instantly connected, causing the batteries to charge each other.

[0016] Preferably: the energy collection management circuit includes a BQ25505 power management chip; the break-before-make logic includes:

[0017] When it is determined that the voltage of the supercapacitor is greater than or equal to the charging completion hysteresis threshold, the VB_PRI_ON pin output becomes high, and the VB_SEC_ON pin signal becomes low, and the supercapacitor is connected to the system for power output;

[0018] When it is determined that the supercapacitor voltage is less than the charging completion threshold, the VB_SEC_ON pin output becomes high, and the VB_PRI_ON pin becomes low, and the backup battery is used to output power.

[0019] Preferably, the energy collection management circuit includes a voltage-dividing resistor, and the voltage-dividing resistor is used to set the charging completion threshold, the hysteresis threshold and the overvoltage threshold.

[0020] Preferably, the energy harvester includes any one or a combination of photovoltaic energy harvesters and thermoelectric energy harvesters.

[0021] Preferably, the photovoltaic energy harvester comprises an amorphous silicon solar cell panel.

[0022] A dosimeter comprises a detector module and the above energy supply device for supplying power to the detector module.

[0023] Preferably, the detector module includes a silicon photomultiplier tube detector, and the bias high voltage of the silicon photomultiplier tube detector is +30 volts.

[0024] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0025] The embodiment of the present application provides an energy replenishment device and a dosimeter, which can use an energy collector and a micro-energy collection management circuit to complete the collection and storage of micro-energy such as micro-energy such as indoor light sources collected and converted by solar panels or thermoelectricity, and provide energy replenishment for the dosimeter. It can provide power for some dosimeter equipment that is inconvenient to supply power and needs to work unattended for a long time, especially for field monitoring and throwing type dosimeter equipment that cannot be easily replenished with power, so as to ensure the long-term stable operation of the dosimeter equipment.

[0026] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 is a connection block diagram of an energy replenishment device provided by an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of an energy collection management circuit provided by an embodiment of the present invention;

[0030] Figure 3 is a schematic diagram of a power switching circuit provided by an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of a step-down / step-down conversion unit provided in an embodiment of the present invention;

[0032] Figure 5 It is a measurement schematic diagram of a dosimeter provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0034] See also Figure 1 , is an energy replenishment device provided by an embodiment of the present invention, such as Figure 1 As shown, the device may include:

[0035] An energy harvesting unit, the energy harvesting unit comprising a connected energy harvester and an energy harvesting management circuit, the energy harvesting management circuit being used to extract and manage target electrical energy in the microwatt to milliwatt range from the energy harvester;

[0036] an energy storage unit, wherein the energy storage unit is used to store the target electric energy;

[0037] The buck-boost conversion unit is used to perform an initial DC-DC buck conversion on the electric energy output by the energy storage unit to obtain a +3 volt low-voltage power supply, a part of which is used to provide a working voltage for the system low-voltage circuit, and another part of which is subjected to a second DC-DC boost conversion and voltage stabilization to obtain a +30 volt high-voltage power supply to provide a bias voltage for the detector module.

[0038] The energy replenishment device provided in the embodiment of the present application can collect micro energy such as indoor light source energy or thermoelectric energy, and replenish energy for the dosimeter equipment after being managed by the energy collection management circuit, so that the dosimeter can be self-sufficient in energy through micro energy sources such as ambient light sources when unattended, thereby extending the working time of the equipment.

[0039] The energy storage unit provided in the embodiment of the present application is used to store the electric energy collected by the energy collection unit. In specific implementation, the embodiment of the present application can provide that the energy storage unit includes one or a combination of super capacitors and backup batteries.

[0040] Furthermore, the energy storage unit includes a supercapacitor and a backup battery connected in parallel;

[0041] The energy collection management circuit controls the supercapacitor or the backup battery to output electric energy through a dual PMOS power switching circuit according to the voltage state between the charging completion threshold, the hysteresis threshold and the supercapacitor.

[0042] The device provided in the embodiment of the present application provides a backup power switching circuit, so that the dosimeter equipment can automatically switch the power supply under set conditions.

[0043] Furthermore, the power switching circuit follows a break-before-make logic to prevent the new and old signal paths from being instantly connected, causing the batteries to charge each other.

[0044] The energy collection management circuit includes a BQ25505 power management chip; the break-before-make logic includes:

[0045] When it is determined that the voltage of the supercapacitor is greater than or equal to the charging completion hysteresis threshold, the VB_PRI_ON pin output becomes high, and the VB_SEC_ON pin signal becomes low, and the supercapacitor is connected to the system for power output;

[0046] When it is determined that the supercapacitor voltage is less than the charging completion threshold, the VB_SEC_ON pin output becomes high, and the VB_PRI_ON pin becomes low, and the backup battery is used to output power.

[0047] The energy collection management circuit includes a voltage-dividing resistor, and the voltage-dividing resistor is used to set the charging completion threshold, the hysteresis threshold and the overvoltage threshold.

[0048] The energy harvester provided in the embodiment of the present application can be configured accordingly according to different sources of energy to be collected. For example, in one implementation, the embodiment of the present application can provide that the energy harvester includes any one or a combination of photovoltaic energy harvesters and thermoelectric energy harvesters.

[0049] Furthermore, the photovoltaic energy collector includes an amorphous silicon solar panel. In practical applications, the energy in the indoor light source can be used as the environmental energy source, and the amorphous silicon solar panel with good weak light conversion efficiency is selected as the energy conversion device to convert and collect the energy of the indoor light source. The collected electric energy is collected and managed by the micro energy collection management circuit and stored in a super capacitor with a better cycle life than a rechargeable battery, and then supplied to the back-end load through boosting, voltage stabilization and other processes.

[0050] The embodiment of the present application may also provide a dosimeter, including a detector module and the above-mentioned energy replenishment device for powering the detector module.

[0051] Furthermore, the detector module includes a silicon photomultiplier tube detector, and the bias high voltage of the silicon photomultiplier tube detector is +30 volts.

[0052] The following uses the BQ25505 power management chip to design an energy collection management circuit and uses a solar panel as an energy harvester as an example to introduce the device and dosimeter provided in the embodiments of the present application in detail.

[0053] The BQ25505 power management chip is used to design an energy collection management circuit, which can effectively extract and manage μW to mW level electrical energy from photovoltaic or thermoelectric energy harvesters. Figure 2 As shown, the output of the solar panel enters the BQ25505 chip through VIN_DC for collection, management and storage in the supercapacitor, and is boosted and output through the boost output VSTOR.

[0054] Adjust the VOC_SAMP (MPPT network sampling point) in the BQ25505 MPPT (programmable maximum power point tracking) sampling network to connect it to VSTOR (boost converter output), thereby setting the MPPT regulation point to 80% of the open circuit voltage. The charging management system sets parameters such as the charging completion threshold (VBAT_OK_PROG), charging completion hysteresis threshold (VBAT_OK_HYST), and overvoltage threshold (VBAT_OV) by setting the voltage divider resistor to complete the management of supercapacitor charging, discharging, and power supply.

[0055] The switching between the supercapacitor and the backup battery is controlled by the dual PMOS power switching circuit according to the charging completion threshold, hysteresis threshold and the voltage state between the supercapacitor. Figure 3 shown.

[0056] Two sets of dual PMOS tubes are connected to the boost converter output and the backup battery respectively. The BQ25505 control signal controls the gate of the PMOS tube to make it conduct at a low level. The switching circuit follows the logic of "break before make" to prevent the new and old signal paths from being instantly connected and causing the batteries to charge each other. When the supercapacitor voltage is greater than or equal to the charging completion hysteresis threshold, the VB_PRI_ON pin output becomes high, and then the VB_SEC_ON pin signal becomes low, connecting the supercapacitor to the system for output; when the supercapacitor voltage is less than the charging completion threshold, the VB_SEC_ON pin output becomes high, and then the VB_PRI_ON pin becomes low, using the backup battery to connect for output.

[0057] like Figure 4As shown, the energy collection management circuit controls the voltage output by the supercapacitor and the backup battery to obtain a +3V low-voltage power supply after the initial DC-DC step-down conversion. A part of it directly provides the working voltage for the system low-voltage circuit, and the other part obtains a +30V high-voltage power supply after the second DC-DC step-up conversion and voltage stabilization to provide the bias voltage for the detector module.

[0058] It can be seen that the device can collect energy from indoor light sources to supply energy to the dosimeter equipment. When the dosimeter is unattended, it can be self-sufficient in energy through ambient light sources, extending the working time of the equipment. At the same time, a micro-energy collection management circuit is designed around the BQ25505 power management chip, which can collect μW-level electrical energy from indoor light sources.

[0059] like Figure 5 As shown in the figure, the detection part of the dosimeter uses SiPM (silicon photomultiplier tube) as the detector module to form a photoelectric conversion device. Its bias high voltage is only +30V, which is small in size and low in power consumption compared to GM counter tubes and photomultiplier tubes. The low-voltage power supply is boosted to a stable DC voltage of +30V by the boost and voltage stabilization circuit to provide the working bias voltage for SiPM. The nuclear pulse signal output by the detector is identified by the comparator, the interference and noise in the circuit are filtered out, and the nuclear pulse signal is converted into a square wave pulse signal that can be processed by the single-chip microcomputer, and finally enters the main control chip for pulse counting.

[0060] In summary, the energy replenishment device provided by the present application can use an energy collector and a micro-energy collection management circuit to complete the collection and storage of micro-energy such as micro-energy such as indoor light sources collected and converted by solar panels or thermoelectricity, and provide energy replenishment for the dosimeter. It can provide power for some dosimeter equipment that is inconvenient to supply power and needs to work unattended for a long time, especially for field monitoring and throwing type dosimeter equipment that cannot be easily replenished with power, so as to ensure the long-term stable operation of the dosimeter equipment.

[0061] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0062] It can be known from the description of the above implementation methods that those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product can be stored in a storage medium such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present application or certain parts of the embodiments.

[0063] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. An energy replenishment device, characterized in that: include: An energy harvesting unit, the energy harvesting unit comprising a connected energy harvester and an energy harvesting management circuit, the energy harvesting management circuit being used to extract and manage target electrical energy in the microwatt to milliwatt range from the energy harvester; an energy storage unit, wherein the energy storage unit is used to store the target electric energy; The buck-boost conversion unit is used to perform an initial DC-DC buck conversion on the electric energy output by the energy storage unit to obtain a +3 volt low-voltage power supply, a part of which is used to provide a working voltage for the system low-voltage circuit, and another part of which is subjected to a second DC-DC boost conversion and voltage stabilization to obtain a +30 volt high-voltage power supply to provide a bias voltage for the detector module.

2. The energy replenishment device according to claim 1, characterized in that: The energy storage unit includes a super capacitor, a backup battery, or a combination of the two.

3. The energy replenishment device according to claim 2, characterized in that: The energy storage unit includes a super capacitor and a backup battery connected in parallel; The energy collection management circuit controls the supercapacitor or the backup battery to output electric energy through a dual PMOS power switching circuit according to the voltage state between the charging completion threshold, the hysteresis threshold and the supercapacitor.

4. The energy replenishment device according to claim 3, characterized in that: The power switching circuit follows the break-before-make logic to prevent the new and old signal paths from being instantly connected and causing the batteries to charge each other.

5. The energy replenishment device according to claim 4, characterized in that: The energy collection management circuit includes a BQ25505 power management chip; the break-before-make logic includes: When it is determined that the voltage of the supercapacitor is greater than or equal to the charging completion hysteresis threshold, the VB_PRI_ON pin output becomes high, and the VB_SEC_ON pin signal becomes low, and the supercapacitor is connected to the system for power output; When it is determined that the supercapacitor voltage is less than the charging completion threshold, the VB_SEC_ON pin output becomes high, and the VB_PRI_ON pin becomes low, and the backup battery is used to output power.

6. The energy replenishment device according to claim 3, characterized in that: The energy collection management circuit includes a voltage-dividing resistor, and the voltage-dividing resistor is used to set the charging completion threshold, the hysteresis threshold and the overvoltage threshold.

7. The energy replenishment device according to claim 1, characterized in that: The energy harvester includes any one of a photovoltaic energy harvester and a thermoelectric energy harvester or a combination of several of them.

8. The energy replenishment device according to claim 7, characterized in that: The photovoltaic energy harvester includes an amorphous silicon solar cell panel.

9. A dosimeter, characterized in that: It comprises a detector module and the energy supply device according to any one of claims 1 to 8 for supplying power to the detector module.

10. The dosimeter according to claim 9, characterized in that: The detector module includes a silicon photomultiplier tube detector, and the bias high voltage of the silicon photomultiplier tube detector is +30 volts.

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