Detector power supply module and personal dosimeter

Abstract

The invention belongs to the technical field of radiation measurement, and particularly relates to a detector power supply module and a personal dosimeter. Comprising a power supply module, a radiation detection module and a communication module, the power supply module provides a working power supply for the radiation detection module and the communication module, and the communication module is used for wirelessly transmitting data of the radiation detection module to a preset terminal. Compared with the prior art, the boost circuit has the advantages that the first-stage operational amplifier circuit is formed by the transistors MN1, MN2, MP1 and MP2, the second-stage operational amplifier circuit is formed by the transistors MN5 and MP3, the bias circuit is formed by the transistors MN3 and MN4, and the boost circuit further comprises the first phase inverting circuit and the second phase inverting circuit, so that the boost circuit has a higher slew rate while boosting; the whole circuit adopts the MOS tube and does not adopt an inductor, and has the advantages of small size, low cost, high voltage conversion efficiency and low loss.

Description

Technical Field

[0001] The present invention belongs to the technical field of radiation measurement, and particularly relates to a detector power supply module and a personal dosimeter. Background Art

[0002] Most of the existing detector power supply modules adopt switching boost converters, and the switching boost converter requires an inductor, which will occupy a large amount of circuit board space. Moreover, the inductance value is directly related to the number of turns. The higher the boost voltage, the more turns are required, and the more circuit board space is occupied. This results in a relatively large size and low cost performance of the entire detector power supply module. Summary of the Invention

[0003] The purpose of the present invention is to provide a detector power supply module and a personal dosimeter, which can solve the problems of relatively large size and low cost performance of the existing detector power supply module.

[0004] The technical solution of the present invention is as follows: A detector power supply module includes a transistor MP1, the gate of the transistor MP1 is connected to the gate of the transistor MP2, the drain and the gate of the transistor MP1 are connected, the drain of the transistor MP1 is connected to the drain of the transistor MN1, the gate of the transistor MN1 is connected to a comparison voltage source Vcom, the drain of the transistor MP2 is connected to the drains of the transistor MN2 and the gate of the transistor MP3, the gate of the transistor MN2 is connected to an input voltage source Vin, the drains of the transistor MN1 and the transistor MN2 are both connected to the drain of the transistor MN4, the gate of the transistor MN4 is connected to the gate of the transistor MN3, the gate and the drain of the transistor MN3 are connected, the drain of the transistor MN3 is connected to the negative electrode of a current source Is and the gate of the transistor MN5, the drains of the transistor MP3 and the transistor MN5 are connected and connected to node A, the positive electrode of the current source Is, the sources of the transistor MP1, the transistor MP2 and the transistor MP3 are all connected to a voltage source VDD, the sources of the transistor MN3, the transistor MN4 and the transistor MN5 are all grounded, and are connected to the input end of a first inverter circuit through the node A, the output end of the first inverter circuit is connected to the input end of a second inverter circuit, and the output end of the second inverter circuit outputs a voltage VOUT.

[0005] The first inverter circuit includes a transistor MP4 and a transistor MN6, the source of the transistor MP4 is connected to the voltage source VDD, the source of the transistor MN6 is grounded, the drain of the transistor MP4 is connected to the drain of the transistor MN6 and connected to node C, the gate of the transistor MP4 is connected to the gate of the transistor MN6 and connected to node B, and the node A is connected to the node B.

[0006] The second inverter circuit includes a transistor MP5 and a transistor MN7. The source of the transistor MP5 is connected to the voltage source VDD. The source of the transistor MN7 is grounded. The gate of the transistor MP5 is connected to the gate of the transistor MN7 and is connected to node D. Node C and node D are connected. The drain of the transistor MP5 is connected to the drain of the transistor MN7 and is connected to node E. The voltage VOUT is output through node E.

[0007] The transistors MP1, MP2, MP3, MP4, and MP5 are all P-type MOS transistors.

[0008] The transistors MN1, MN2, MN3, MN4, MN5, MN6, and MN7 are all N-type MOS transistors.

[0009] A personal dosimeter includes a power supply module, a radiation detection module, and a communication module. The power supply module provides operating power for the radiation detection module and the communication module. The communication module is used to wirelessly transmit the data of the radiation detection module to a preset terminal.

[0010] The radiation detection module includes a silicon semiconductor detector, a detector power supply module, a charge-sensitive preamplifier chip, a low-power processor, a status indication unit, a communication unit, and a display unit. The output end of the silicon semiconductor detector is connected to the input end of the charge-sensitive preamplifier chip. The output end of the charge-sensitive preamplifier is connected to the low-power processor. The status indication unit, the communication unit, and the display unit are all connected to the low-power processor. The detector power supply module is used to boost the voltage output by the power supply module to the rated operating voltage of the silicon semiconductor detector.

[0011] The detector power supply module is the aforementioned detector power supply module.

[0012] The beneficial effects of the present invention are as follows: The present invention forms a first-stage operational amplifier circuit through transistors MN1, MN2, MP1, and MP2, forms a second-stage operational amplifier circuit through transistors MN5 and MP3, and transistors MN3 and MN4 form a bias circuit. It also includes a first inverter circuit and a second inverter circuit, which not only enables the circuit to have a voltage boost but also has a large slew rate; the entire circuit uses MOS transistors and does not use inductors, having the advantages of small size, low cost, high voltage conversion efficiency, and low loss. Description of the Drawings

[0013] Figure 1It is a schematic circuit diagram of a detector power supply module provided by the present invention;

[0014] Figure 2 It is a schematic diagram of the composition of a personal dosimeter provided by the present invention. Detailed implementation manners

[0015] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0016] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0017] The present invention uses Vcom as a constant voltage. The gate of transistor MN2 is connected to the Vin voltage signal to drive the circuit to work. A first-stage operational amplifier circuit is formed by transistors MN1, MN2, MP1 and MP2, and a second-stage operational amplifier circuit is formed by transistors MN5 and MP3. The first-stage operational amplifier circuit and the second-stage operational amplifier circuit are used for boosting. The current source Is, transistors MN3 and MN4 form a bias circuit. The function of the bias circuit is to provide an ideal constant current source for the circuit to ensure the reliability and accuracy of the device operation and improve its performance. Transistors MN3 and MN4 are common-source and common-gate, resulting in the sum of their currents being proportional to the aspect ratio of transistor MN5. Moreover, since the output of the second-stage operational amplifier circuit is an analog signal, in order to increase the slew rate of the circuit, a first inverting circuit is set to make the output intermediate value more accurate, and a second inverting circuit is set to make the converted voltage more in place. The slew rate of the circuit is the conversion efficiency of the output voltage.

[0018] Embodiment 1

[0019] As Figure 1As shown in the figure, a detector power supply module includes a transistor MP1. The gate of the transistor MP1 is connected to the gate of the transistor MP2. The drain and the gate of the transistor MP1 are connected. The drain of the transistor MP1 is connected to the drain of the transistor MN1. The gate of the transistor MN1 is connected to a comparison voltage source Vcom. The drain of the transistor MP2 is connected to both the drain of the transistor MN2 and the gate of the transistor MP3. The gate of the transistor MN2 is connected to an input voltage source Vin. The drain of the transistor MN1 and the drain of the transistor MN2 are both connected to the drain of the transistor MN4. The gate of the transistor MN4 is connected to the gate of the transistor MN3. The gate and the drain of the transistor MN3 are connected. The drain of the transistor MN3 is connected to both the negative pole of a current source Is and the gate of the transistor MN5. The drain of the transistor MP3 and the drain of the transistor MN5 are connected and connected to node A. The positive pole of the current source Is, the source of the transistor MP1, the source of the transistor MP2, and the source of the transistor MP3 are all connected to a voltage source VDD. The source of the transistor MN3, the source of the transistor MN4, and the source of the transistor MN5 are all grounded. It is connected to the input end of a first inverter circuit through node A. The output end of the first inverter circuit is connected to the input end of a second inverter circuit. The output end of the second inverter circuit outputs a voltage VOUT.

[0020] The specific implementation of the present invention is as follows: In this embodiment, Vcom is used as a constant voltage. The gate of the transistor MN2 is connected to a Vin voltage signal to drive the circuit to work. A first-stage operational amplifier circuit is formed by the transistors MN1, MN2, MP1, and MP2. A second-stage operational amplifier circuit is formed by the transistors MN5 and MP3. The first-stage operational amplifier circuit and the second-stage operational amplifier circuit are used for boosting. The current source Is, the transistors MN3, and MN4 form a bias circuit. The function of the bias circuit is to provide an ideal constant current source for the circuit to ensure the reliability and accuracy of the device operation and improve its performance. The transistors MN3 and MN4 share the source and the gate, resulting in the sum of their currents being proportional to the width-to-length ratio of the transistor MN5. Moreover, since the output of the second-stage operational amplifier circuit is an analog signal, in order to increase the slew rate of the circuit, a first inverter circuit is set to make the output intermediate value more accurate, and a second inverter circuit is set to make the converted voltage more in place. The slew rate of the circuit is the conversion efficiency of the output voltage.

[0021] One implementation of the first inverter circuit includes transistor MP4 and transistor MN6. The source of transistor MP4 is connected to voltage source VDD. The source of transistor MN6 is grounded. The drain of transistor MP4 is connected to the drain of transistor MN6 and connected to node C. The gate of transistor MP4 is connected to the gate of transistor MN6 and connected to node B. Node A is connected to node B.

[0022] One implementation of the second inverter circuit includes transistor MP5 and transistor MN7. The source of transistor MP5 is connected to voltage source VDD. The source of transistor MN7 is grounded. The gate of transistor MP5 is connected to the gate of transistor MN7 and connected to node D. Node C is connected to node D. The drain of transistor MP5 is connected to the drain of transistor MN7 and connected to node E. Voltage VOUT is output through node E.

[0023] That is, a two-stage inverter circuit (the first and second inverter circuits) is formed by transistors MP4, MN6, MP5, and MN7, and the two-stage inverter circuit is used to increase the conversion efficiency of the output voltage of the entire circuit.

[0024] The power supply module in this embodiment is required to output a large slew rate on the basis of realizing the boost logic function to increase the conversion efficiency of the output voltage. Moreover, the entire module uses MOS transistors instead of inductors, and has the advantages of small size, low cost, high voltage conversion efficiency, and low loss.

[0025] Among them, transistor MP1, transistor MP2, transistor MP3, transistor MP4, and transistor MP5 are all P-type MOS transistors.

[0026] Among them, transistor MN1, transistor MN2, transistor MN3, transistor MN4, transistor MN5, transistor MN6, and transistor MN7 are all N-type MOS transistors.

[0027] Embodiment 2

[0028] As Figure 2 shown, a personal dosimeter includes a power supply module, a radiation detection module, and a communication module. The power supply module provides working power for the radiation detection module and the communication module. The communication module is used to wirelessly transmit the data of the radiation detection module to a preset terminal;

[0029] The radiation detection module includes a silicon semiconductor detector, a detector power supply module, a charge sensitive preamplifier chip, a low-power processor, a status indication unit, a communication unit, and a display unit. The output end of the silicon semiconductor detector is connected to the input end of the charge sensitive preamplifier chip. The output end of the charge sensitive preamplifier is connected to the low-power processor. The status indication unit, the communication unit, and the display unit are all connected to the low-power processor. The detector power supply module is used to boost the voltage output by the power supply module to the rated working voltage of the silicon semiconductor detector.

[0030] The detector power supply module includes a detector power supply module as described in any one of the above.

[0031] The working principle of the personal dosimeter: First, the radiation dose is detected by a silicon semiconductor detector. The silicon semiconductor detector used is based on a customized PN junction diode and can detect radiation gamma rays. This detector belongs to a solid-state sensor and has the advantages of high immunity to electrostatic fields, insensitivity to magnetic fields, and ultra-low power consumption. The radiation dose signal obtained by the silicon semiconductor detector is amplified by a charge sensitive preamplifier chip because the detector output signal is generally small. The charge sensitive preamplifier chip amplifies the detector output signal and then transmits it to the low-power processor. The detector power supply module is used to boost the voltage output by the power supply module to the rated working voltage of the silicon semiconductor detector.

[0032] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0033] Obviously, those skilled in the art can make various changes and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A detector power supply module, characterized in that: The invention comprises a transistor MP1, wherein the gate of the transistor MP1 is connected to the gate of the transistor MP2, the drain of the transistor MP1 is connected to the gate, the drain of the transistor MP1 is connected to the drain of the transistor MN1, the gate of the transistor MN1 is connected to the comparison voltage source Vcom, the drain of the transistor MP2 is connected to the drain of the transistor MN2 and the gate of the transistor MP3, the gate of the transistor MN2 is connected to the input voltage source Vin, the drain of the transistor MN1 and the drain of the transistor MN2 are both connected to the drain of the transistor MN4, the gate of the transistor MN4 is connected to the gate of the transistor MN3, the gate and drain of the transistor MN3 are connected , the drain of the transistor MN3 is connected to the negative electrode of the current source Is and the gate of the transistor MN5, the drain of the transistor MP3 is connected to the drain of the transistor MN5 and to the A node, the positive electrode of the current source Is, the source of the transistor MP1, the source of the transistor MP2 and the source of the transistor MP3 are all connected to the voltage source VDD, the source of the transistor MN3, the source of the transistor MN4 and the source of the transistor MN5 are all grounded, connected to the input end of the first inverter circuit through the A node, the output end of the first inverter circuit is connected to the input end of the second inverter circuit, and the output end of the second inverter circuit outputs the voltage VOUT.

2. A detector power supply module according to claim 1, characterized in that: The first inverter circuit includes a transistor MP4 and a transistor MN6, the source of the transistor MP4 is connected to the voltage source VDD, the source of the transistor MN6 is grounded, the drain of the transistor MP4 is connected to the drain of the transistor MN6 and to the C node, the gate of the transistor MP4 is connected to the gate of the transistor MN6 and to the B node, and the A node is connected to the B node.

3. A detector power supply module according to claim 1, characterized in that: The second inverter circuit includes a transistor MP5 and a transistor MN7, the source of the transistor MP5 is connected to the voltage source VDD, the source of the transistor MN7 is grounded, the gate of the transistor MP5 is connected to the gate of the transistor MN7 and to the D node, the C node is connected to the D node, the drain of the transistor MP5 is connected to the drain of the transistor MN7 and to the E node, and the voltage VOUT is output through the E node.

4. A detector power supply module according to claim 1, characterized in that: The transistor MP1 , the transistor MP2 , the transistor MP3 , the transistor MP4 , and the transistor MP5 are all P-type MOS transistors.

5. A detector power supply module according to claim 1, characterized in that: The transistor MN1 , the transistor MN2 , the transistor MN3 , the transistor MN4 , the transistor MN5 , the transistor MN6 , and the transistor MN7 are all N-type MOS transistors.

6. A personal dosimeter, characterized in that: It includes a power module, a radiation detection module and a communication module, wherein the power module provides working power for the radiation detection module and the communication module, and the communication module is used to wirelessly transmit the data of the radiation detection module to a preset terminal; The radiation detection module includes a silicon semiconductor detector, a detector power supply module, a charge-sensitive preamplifier chip, a low-power processor, a status indication unit, a communication unit and a display unit. The output end of the silicon semiconductor detector is connected to the input end of the charge-sensitive preamplifier chip, the output end of the charge-sensitive preamplifier is connected to the low-power processor, the status indication unit, the communication unit and the display unit are all connected to the low-power processor, and the detector power supply module is used to increase the voltage output by the power supply module to the rated operating voltage of the silicon semiconductor detector.

7. A personal dosimeter as claimed in claim 6, characterized in that: The detector power supply module is a detector power supply module as described in any one of claims 1-5.

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