CN103516232B - A kind of power supply dispensable circuit of high-precision loose coupling multilevel voltage output - Google Patents
A kind of power supply dispensable circuit of high-precision loose coupling multilevel voltage output Download PDFInfo
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Abstract
The present invention discloses a kind of power supply dispensable circuit of high-precision loose coupling multilevel voltage output, wherein：The alternating current of industry spot is converted into low-voltage DC by power decoupling modular converter, and a strategic point stream of connecting on the output encloses to eliminate interference of 300KHz or so the switching frequency to tag read signal；High-precision two-stage Voltage stabilizing module can guarantee that the power supply effect of RFID integrated chips；Step-down adjusting module can reduce the fuel factor of pressure drop on circuit boards while subsequent module required input voltage x current is supplied to；The Large Copacity storage capacitor of Transient Currents module is there is provided the Transient Currents needed for RFID power amplifiers without drastically dragging down magnitude of voltage；Steady-state DC module provides the power supply of Transaction Controller；Low pressure micro-current module is supplied to high frequency switch power.The present invention makes all power supply noises collect the output end of power decoupling conversion, shields influencing each other for each level power supply needed for rfid interrogator, realizes loose coupling.<!-- 2 -->
Description
Technical field
The present invention relates to the design of power-supply system, more particularly to a kind of power supply dispensable circuit of high-precision loose coupling multilevel voltage output.
Background technology
As Internet of Things is in the extensive application of the national industrial every aspect such as intelligent grid, intelligent transportation, Intelligent logistics and ecological monitoring, the RFID technique of uhf band is even more to quickly grow, it is a kind of contactless automatic identification technology, it is by radiofrequency signal automatic identification destination object and obtains related data, recognize that work, without manual intervention, is operable with various adverse circumstances.RFID system is made up of label, 3 parts of read write line and antenna, and wherein rfid interrogator is the core of whole RFID system.Rfid interrogator is related to multilevel voltage and extremely harsh requirement is suffered to power supply, and its transtation mission circuit, which needs radiofrequency signal to amplify, to be exported, and the unlatching of power amplifier needs moment to pull out high current, is particularly easy to cause the fluctuation of power supply；Its receiving circuit needs the influence of shielded power supply noise；Because it will provide low pressure micro-current toward contact the need for business.The voltage of above multiple grades easily interacts, and causes rfid interrogator job insecurity.Trace to its source, the power supply dispensable circuit of high-precision loose coupling multilevel voltage output could solve the powerup issue of rfid interrogator.
Through retrieval, Chinese invention patent application number is 201010237077.2, and patent name is：Multi-stage power source.The patent provides a kind of multi-stage power source：" a kind of multi-stage power source according to an aspect of the present invention can include:Voltage translator circuit part, it is included in multiple the first to the n-th DC/DC converters being connected in series between input and output end, to have multiple LED LED array to provide DC driving voltages thereto;Current detection section, for detecting the output voltage from the voltage translator circuit part;And, PWM control sections, the 3rd detection voltage that the current waveform of the internal switch of the n-th DC/DC converters is flowed through for the second detection voltage that the electric current of the LED array is flowed through based on the first detection voltage from the current detection section, by detecting and is obtained and by detection and is obtained provides described pwm control signal to produce pwm control signal to each of the first to the n-th DC/DC converters.”
Above-mentioned patent is compared with technical key point：
1. multilevel voltage producing method：Multiple DC/DC converters are connected in series between the invention input and output end, although multi-stage power source can be provided, but the output of the voltage power of rear stage can all influence the voltage stability of previous stage.The voltage noise that required each step voltage of the invention final produces required power all collects the output end that power decoupling is changed, and shields influencing each other for each level power supply needed for rfid interrogator, realizes loose coupling.
2. voltage detecting is controlled：The invention produces pwm control signal by multistage detection voltage, and the supply of multi-stage power source is finally realized with PWM ripples.The present invention introduces PI controls, it is ensured that respond rapidly to demand of the subsequent voltage to electric current by closed loop feedback.
Chinese invention patent application number is：200610062094.0, it is entitled：Mobile terminal and its method for managing power supply, the invention are related to a kind of mobile terminal and its method for managing power supply：" above method comprises the following steps:Electric quantity of power supply is divided into multiple ranks according to the power consumption levels of each communication module and functional module in mobile terminal;The each rank of correspondence sets an electric threshold value respectively;Judge whether the electric quantity of power supply of mobile terminal is less than any one electric threshold value of above-mentioned setting, corresponding communication module or functional module are closed according to priority if being less than;Above-mentioned mobile terminal includes CPU, respectively with the multiple communication modules and functional module of CPU connections, power module, power detecting module, for above-mentioned multiple communication modules and functional module to be divided into multiple ranks, and each rank of correspondence sets the multi-stage power source management module of an electric threshold value.Because mobile terminal of the present invention and its method for managing power supply according to communication module or functional module power consumption levels by that by electric quantity of power supply will be divided into multiple ranks, and the electric threshold comparison closing processing of progress is classified, can be achieved effectively to utilize battery electric quantity.”
Above-mentioned patent is compared with technical key point：
Priority level initializing：The closing sequence of each module when the invention determines voltage less than setting threshold values according to the power consumption height of each communication module and functional module.The power reguirements of the present invention must are fulfilled for the power consumption demand of corresponding module, but power when must isolate electricity consumption between each module interacts.
The content of the invention
The purpose of the present invention is there is multilevel voltage for the power supply of rfid interrogator and interfere with each other, Transient Currents influence the defect of electrical stability, there is provided a kind of power supply dispensable circuit of high-precision loose coupling multilevel voltage output, influence of the Transient Currents to power-supply fluctuation when can avoid the power amplifier from opening, Communication Jamming of the disconnecting switch chip intrinsic frequency to rfid interrogator and label, all power supply noises are all collected the output end of power decoupling conversion, shield influencing each other between each level power supply needed for rfid interrogator.
To realize above-mentioned purpose, the present invention uses following technical scheme：
A kind of power supply dispensable circuit of high-precision loose coupling multilevel voltage output, including power decoupling modular converter, high-precision two-stage Voltage stabilizing module, step-down adjusting module, Transient Currents module, steady-state DC module and low pressure micro-current module；The power decoupling modular converter is connected with high-precision two-stage Voltage stabilizing module, step-down adjusting module respectively；The step-down adjusting module is connected with Transient Currents module, steady-state DC module, low pressure micro-current module respectively, wherein：
Power decoupling modular converter is converted into the 220V alternating currents of industry spot by ACDC devices the low-voltage DC of required power, and a strategic point stream of having connected on the output encloses to eliminate interference of 300KHz or so the switching frequency to tag read signal；
The voltage regulation factor and Ripple Suppression effect of high-precision two-stage Voltage stabilizing module can guarantee that the power supply effect of RFID integrated chips；
Step-down adjusting module can reduce the fuel factor of pressure drop on circuit boards while subsequent module required input voltage x current is supplied to；
The Large Copacity storage capacitor of Transient Currents module is there is provided the Transient Currents needed for RFID power amplifiers without drastically dragging down magnitude of voltage；
Steady-state DC module provides the power supply of Transaction Controller and its power supply of peripheral circuit；
Low pressure micro-current module is supplied to the special power supply of HF switch.
In the present invention, the power decoupling modular converter inputs the 220V alternating currents of industry spot, 220V alternating currents are converted into industrial the most frequently used low pressure 24V direct currents with more than 90% efficiency, a strategic point stream of having been connected on 24V DC output ends is enclosed, the power decoupling modular converter exports 24V direct currents, high-precision two-stage Voltage stabilizing module is wherein output to all the way, and another road is output to switching mode step-down adjusting module.
In the present invention, the high-precision two-stage Voltage stabilizing module input 24V direct currents, the wherein first order is from 24V voltage stabilizing to 9V, and the second level is from 9V voltage stabilizing to 5.3V.
In the present invention, the step-down adjusting module input 24V direct currents, the fuel factor of pressure drop on circuit boards can be reduced while being supplied to subsequent module required input voltage x current, the first via supply Transient Currents module of adjusting module output is depressured, coordinates Large Copacity storage capacitor there is provided the Transient Currents needed for RFID power amplifiers without drastically dragging down magnitude of voltage；The second tunnel supply steady-state DC module of step-down adjusting module output meets the demand of the power supply of Transaction Controller and its power supply of peripheral circuit；The 3rd tunnel supply low pressure micro-current module of step-down adjusting module output meets the demand of the special power supply of HF switch.
Design more than of the invention make it that all power supply noises all collect the output end of power decoupling conversion, shields influencing each other for each level power supply needed for rfid interrogator, realizes loose coupling.The present invention is had been used in the RFID location system of Baosteel circular orbit car, effectively improves the reading/writing distance of RFID system.
Brief description of the drawings
Fig. 1 is power supply dispensable circuit structural schematic block diagram of the present invention.
Fig. 2 is power decoupling modular converter circuit theory diagrams in one embodiment of the invention.
Fig. 3 is high-precision two-stage Voltage stabilizing module circuit theory diagrams in one embodiment of the invention.
Fig. 4 is step-down adjusting module circuit theory diagrams in one embodiment of the invention.
Fig. 5 is Transient Currents modular circuit schematic diagram in one embodiment of the invention.
Fig. 6 is steady-state DC modular circuit schematic diagram in one embodiment of the invention.
Fig. 7 is one embodiment of the invention mesolow micro-current modular circuit schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the technical solution of the present invention is further explained, but following content is not intended to limit the scope of the invention.
Embodiment
Reference picture 1, the power supply dispensable circuit of high-precision loose coupling multilevel voltage output of the invention includes power decoupling modular converter 1, high-precision two-stage Voltage stabilizing module 2, step-down adjusting module 3, Transient Currents module 4, steady-state DC module 5 and low pressure micro-current module 6.Power decoupling modular converter 1 is connected with high-precision two-stage Voltage stabilizing module 2 and step-down adjusting module 3 respectively；Step-down adjusting module 3 is connected with Transient Currents module 4, steady-state DC module 5 and low pressure micro-current module 6 respectively.
In order to be supplied to the DC low-voltage that rear class is different, the 220V alternating currents of the industry spot of input pass through power decoupling modular converter 1 first, 220V alternating currents are converted into industrial the most frequently used low pressure 24V direct currents by power decoupling modular converter 1 with more than 90% efficiency, in order to prevent interference of Switching Power Supply 300KHz or so the switching frequency to tag read signal, a strategic point stream circle of having been connected on 24V DC output ends.In order to provide the RFID power supplies of pure stabilization, the high-precision two-stage Voltage stabilizing module 2 of input all the way of 24V direct currents, the wherein first order is from 24V voltage stabilizing to 9V, and the second level is from 9V voltage stabilizing to 5.3V, such design not only improves power module radiating, is conducive to the suppression of ripple again.The fuel factor of pressure drop on circuit boards can be reduced while being supplied to subsequent module required input voltage x current from another road input switch type step-down adjusting module 3 of 24V direct currents, the first via supply Transient Currents module 4 that adjusting module 3 is exported is depressured, coordinates Large Copacity storage capacitor there is provided the Transient Currents needed for RFID power amplifiers without drastically dragging down magnitude of voltage.The second tunnel supply steady-state DC module 5 that step-down adjusting module 3 is exported meets the demand of the power supply of Transaction Controller and its power supply of peripheral circuit.The 3rd tunnel supply low pressure micro-current module 6 that step-down adjusting module 4 is exported meets the demand of the special power supply of HF switch.
Fig. 2 shows a kind of embodiment of power decoupling modular converter.Wherein, AC/DC devices U1 the 5th pin and the 6th pin are hanging, and the 1st pin is connected with button S1 one end, and the 2nd pin is connected with the zero line of 220V alternating currents, and the 3rd pin is connected with fuse F1 one end, and the 4th pin is connected with one end of second electric wire through choke coil P1；The button S1 other end is connected with the live wire of 220V alternating currents；The fuse F1 other end is connected with one end of first electric wire through choke coil P1；The other end through choke coil P1 first electric wire is connected with inductance L1 one end, through the other end ground connection of choke coil P1 second electric wire；The inductance L1 other end is connected with electric capacity C1-1 positive pole and 9V power supplys；Electric capacity C1-1 negative pole ground connection.
The presence of fuse is the output for controlling general supply, prevents that power supply and ground short circuit from causing to damage to equipment；Allow AC/DC output to be powered again to whole system by choke coil, interference of the Switching Power Supply intrinsic frequency to rfid interrogator and label communication can be weakened；End inductance capacitance constitutes LC filter circuits and reduces output voltage ripple.
Fig. 3 shows a kind of embodiment of high-precision two-stage Voltage stabilizing module.Wherein, it is connected after first order lowering and stabilizing blood pressure chip U2 the 1st pin and the 2nd pin short circuit with the positive pole of 9V power supplys and electric capacity C2-1,3rd pin is grounded, one end, electric capacity C2-2 positive pole and the 5V8 power supplys of 4th pin respectively with resistance R2-1 are connected, and the 5th pin is connected with the resistance R2-1 other end and resistance R2-2 one end respectively；Electric capacity C2-1 negative pole ground connection；Resistance R2-2 other end ground connection；Electric capacity C2-2 negative pole ground connection.Second level low voltage difference voltage stabilizing chip U3 the 1st pin and the 7th pin is hanging, positive pole, resistance R3-1 one end and the power supply 5V4 of 2nd pin respectively with electric capacity C3-3 are connected, 3rd pin is connected with the resistance R3-1 other end and resistance R3-2 one end respectively, 4th pin is grounded, positive pole, electric capacity C3-2 positive pole and 5V8 power supplys after 5th pin and the 8th pin short circuit respectively with electric capacity C3-1 are connected, the 6th pin ground connection；Electric capacity C3-3 negative pole ground connection；Resistance R3-2 other end ground connection；Electric capacity C3-1 negative pole ground connection；Electric capacity C3-2 negative pole ground connection.
Common one-level voltage stabilizing is outclassed by the voltage regulation factor and Ripple Suppression effect after lowering and stabilizing blood pressure and low voltage difference voltage stabilizing series connection, it can be supplied to the stable voltage of RFID integrated chips, and ripple is less than 10mV.
Fig. 4 shows a kind of embodiment of step-down adjusting module.Wherein, high-current switch chip U4 the 1st pin is connected with electric capacity C4-1 positive pole and 9V power supplys respectively, and the 2nd pin is connected with diode D1 N poles and inductance L2 one end respectively, the 3rd pin ground connection, 4th pin is connected respectively at the inductance L2 other end, electric capacity C4-2 positive pole with 5V power supplys, the 5th pin ground connection；Electric capacity C4-1 negative pole ground connection；Diode D1 P poles ground connection；Electric capacity C4-2 negative pole ground connection.
The purpose for carrying out step-down adjustment using high-current switch chip is to reduce the heat that pressure drop is delivered on circuit board, while adding a closed loop circuit, introduces PI controls, it is ensured that respond rapidly to the demand of follow-up three kinds of voltage verses currents.
Fig. 5 shows a kind of embodiment of Transient Currents module.Wherein, it is connected respectively with electric capacity C5-1 positive pole and 5V power supplys after high current voltage stabilizing chip U5 the 1st pin and the 2nd pin short circuit, 3rd pin is grounded, one end, electric capacity C5-2 positive pole and the 3V5 power supplys of 4th pin respectively with resistance R5-1 are connected, and the 5th pin is connected with the resistance R5-1 other end and resistance R5-2 one end respectively；Electric capacity C5-1 negative pole ground connection；Resistance R5-2 other end ground connection；Electric capacity C5-2 negative pole ground connection.
Resistance R5-1 and resistance R5-2 constitute partial pressure feedback circuit so that output end can obtain being near the mark the voltage of N times of voltage source
Fig. 6 shows a kind of embodiment of steady-state DC module.Wherein, voltage stabilizing chip U6 the 4th pin is hanging, and the 1st pin ground connection, the 2nd pin is connected with electric capacity C6-3 positive pole and inductance L3 one end respectively, and one end, electric capacity C6-1 positive pole and the 5V power supplys of the 3rd pin respectively with electric capacity C6-2 are connected；Electric capacity C6-3 negative pole ground connection；Inductance L3 another termination 3V3 power supplys；Electric capacity C6-2 other end ground connection；Electric capacity C6-1 negative pole ground connection.
Fig. 7 shows a kind of embodiment of low pressure micro-current module.Wherein, voltage stabilizing chip U7 the 4th pin is hanging, one end of 1st pin positive pole respectively with electric capacity C7-3, resistance R7-1 one end and resistance R7-2 is connected, one end of the 2nd pin other end respectively with resistance R7-1, electric capacity C7-4 positive pole and inductance L4 is connected, and one end, electric capacity C7-1 positive pole and the 5V power supplys of the 3rd pin respectively with electric capacity C7-2 are connected；Electric capacity C7-3 negative pole ground connection；Resistance R7-2 other end ground connection；Electric capacity C7-4 negative pole ground connection；Inductance L4 another termination 2V7 power supplys；Electric capacity C7-2 other end ground connection；Electric capacity C7-1 negative pole ground connection.
More than influence of Transient Currents of design when can avoid the power amplifier from opening to power-supply fluctuation, Communication Jamming of the disconnecting switch chip intrinsic frequency to rfid interrogator and label, all power supply noises are all collected the output end of power decoupling conversion, shield influencing each other between each level power supply needed for rfid interrogator.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that the description above is not considered as limitation of the present invention.After those skilled in the art have read the above, a variety of modifications and substitutions for the present invention all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (8)
1. a kind of power supply dispensable circuit of high-precision loose coupling multilevel voltage output, it is characterised in that including power decoupling modular converter, high-precision two-stage Voltage stabilizing module, step-down adjusting module, Transient Currents module, steady-state DC module and low pressure micro-current module；The power decoupling modular converter is connected with high-precision two-stage Voltage stabilizing module, step-down adjusting module respectively；The step-down adjusting module is connected with Transient Currents module, steady-state DC module, low pressure micro-current module respectively, wherein：
Power decoupling modular converter is converted into the 220V alternating currents of industry spot by AC/DC devices the low-voltage DC of required power, and a choke coil of having connected on the output is to eliminate interference of 300KHz or so the switching frequency to tag read signal；
High-precision two-stage Voltage stabilizing module realizes voltage regulation factor and Ripple Suppression, it is ensured that the power supply effect of RFID integrated chips；
Step-down adjusting module can reduce the fuel factor of pressure drop on circuit boards while subsequent module required input voltage x current is supplied to；
The Large Copacity storage capacitor of Transient Currents module is there is provided the Transient Currents needed for RFID power amplifiers without drastically dragging down magnitude of voltage；
Steady-state DC module provides the power supply of Transaction Controller and its power supply of peripheral circuit；
Low pressure micro-current module is supplied to the special power supply of HF switch；
The power decoupling modular converter inputs the 220V alternating currents of industry spot, 220V alternating currents are converted into industrial the most frequently used low pressure 24V direct currents with more than 90% efficiency, connected on 24V DC output ends a choke coil, the power decoupling modular converter exports 24V direct currents, high-precision two-stage Voltage stabilizing module is wherein output to all the way, and another road is output to step-down adjusting module；
The circuit structure of the power decoupling modular converter is：AC/DC devices U1 the 5th pin and the 6th pin is hanging, and the 1st pin is connected with button S1 one end, and the 2nd pin is connected with the zero line of 220V alternating currents, and the 3rd pin is connected with fuse F1 one end, and the 4th pin is connected with one end of second electric wire through choke coil P1；The button S1 other end is connected with the live wire of 220V alternating currents；The fuse F1 other end is connected with one end of first electric wire through choke coil P1；The other end through choke coil P1 first electric wire is connected with inductance L1 one end, through the other end ground connection of choke coil P1 second electric wire；The inductance L1 other end is connected with electric capacity C1-1 positive pole and 9V power supplys；Electric capacity C1-1 negative pole ground connection.
2. the power supply dispensable circuit of high-precision loose coupling multilevel voltage output according to claim 1, it is characterised in that：The high-precision two-stage Voltage stabilizing module input 24V direct currents, the wherein first order is from 24V voltage stabilizing to 9V, and the second level is from 9V voltage stabilizing to 5.3V.
3. the power supply dispensable circuit of high-precision loose coupling multilevel voltage output according to claim 1, it is characterised in that：The step-down adjusting module input 24V direct currents, the fuel factor of pressure drop on circuit boards can be reduced while being supplied to subsequent module required input voltage x current, the first via supply Transient Currents module of adjusting module output is depressured, coordinates Large Copacity storage capacitor there is provided the Transient Currents needed for RFID power amplifiers without drastically dragging down magnitude of voltage；The second tunnel supply steady-state DC module of step-down adjusting module output meets the demand of the power supply of Transaction Controller and its power supply of peripheral circuit；The 3rd tunnel supply low pressure micro-current module of step-down adjusting module output meets the demand of the special power supply of HF switch.
4. the power supply dispensable circuit of the high-precision loose coupling multilevel voltage output according to claim any one of 1-3, it is characterised in that：The circuit structure of the high-precision two-stage Voltage stabilizing module is：First order lowering and stabilizing blood pressure chip U2 uses the chip of MIC29302BU models, it is connected after U2 the 1st pin and the 2nd pin short circuit with the positive pole of 9V power supplys and electric capacity C2-1,3rd pin is grounded, one end, electric capacity C2-2 positive pole and the 5V8 power supplys of 4th pin respectively with resistance R2-1 are connected, and the 5th pin is connected with the resistance R2-1 other end and resistance R2-2 one end respectively；Electric capacity C2-1 negative pole ground connection；Resistance R2-2 other end ground connection；Electric capacity C2-2 negative pole ground connection；Second level low voltage difference voltage stabilizing chip U3 uses the chip of LT3021 models, U3 the 1st pin and the 7th pin are hanging, positive pole, resistance R3-1 one end and the power supply 5V4 of 2nd pin respectively with electric capacity C3-3 are connected, 3rd pin is connected with the resistance R3-1 other end and resistance R3-2 one end respectively, 4th pin is grounded, positive pole, electric capacity C3-2 positive pole and 5V8 power supplys after 5th pin and the 8th pin short circuit respectively with electric capacity C3-1 are connected, the 6th pin ground connection；Electric capacity C3-3 negative pole ground connection；Resistance R3-2 other end ground connection；Electric capacity C3-1 negative pole ground connection；Electric capacity C3-2 negative pole ground connection.
5. the power supply dispensable circuit of the high-precision loose coupling multilevel voltage output according to claim any one of 1-3, it is characterised in that：It is described step-down adjusting module circuit structure be：High-current switch chip U4 uses the chip of LM2576 models, U4 the 1st pin is connected with electric capacity C4-1 positive pole and 9V power supplys respectively, 2nd pin is connected with diode D1 N poles and inductance L2 one end respectively, 3rd pin is grounded, 4th pin is connected respectively at the inductance L2 other end, electric capacity C4-2 positive pole with 5V power supplys, the 5th pin ground connection；Electric capacity C4-1 negative pole ground connection；Diode D1 P poles ground connection；Electric capacity C4-2 negative pole ground connection.
6. the power supply dispensable circuit of the high-precision loose coupling multilevel voltage output according to claim any one of 1-3, it is characterised in that：The circuit structure of the Transient Currents module is：High current voltage stabilizing chip U5 uses the chip of MIC29302BU models, positive pole and 5V power supplys after U5 the 1st pin and the 2nd pin short circuit respectively with electric capacity C5-1 are connected, 3rd pin is grounded, one end, electric capacity C5-2 positive pole and the 3V5 power supplys of 4th pin respectively with resistance R5-1 are connected, and the 5th pin is connected with the resistance R5-1 other end and resistance R5-2 one end respectively；Electric capacity C5-1 negative pole ground connection；Resistance R5-2 other end ground connection；Electric capacity C5-2 negative pole ground connection；Resistance R5-1 and resistance R5-2 constitute partial pressure feedback circuit.
7. the power supply dispensable circuit of the high-precision loose coupling multilevel voltage output according to claim any one of 1-3, it is characterised in that：The circuit structure of the steady-state DC module is：Voltage stabilizing chip U6 uses the chip of LM1117MP-3.3 models, and U6 the 4th pin is hanging, and the 1st pin ground connection, the 2nd pin is connected with electric capacity C6-3 positive pole and inductance L3 one end respectively, and one end, electric capacity C6-1 positive pole and the 5V power supplys of the 3rd pin respectively with electric capacity C6-2 are connected；Electric capacity C6-3 negative pole ground connection；Inductance L3 another termination 3V3 power supplys；Electric capacity C6-2 other end ground connection；Electric capacity C6-1 negative pole ground connection.
8. the power supply dispensable circuit of the high-precision loose coupling multilevel voltage output according to claim any one of 1-3, it is characterised in that：The circuit structure of the low pressure micro-current module is：Voltage stabilizing chip U7 uses the chip of LM1117MP models, U7 the 4th pin is hanging, one end of 1st pin positive pole respectively with electric capacity C7-3, resistance R7-1 one end and resistance R7-2 is connected, one end of the 2nd pin other end respectively with resistance R7-1, electric capacity C7-4 positive pole and inductance L4 is connected, and one end, electric capacity C7-1 positive pole and the 5V power supplys of the 3rd pin respectively with electric capacity C7-2 are connected；Electric capacity C7-3 negative pole ground connection；Resistance R7-2 other end ground connection；Electric capacity C7-4 negative pole ground connection；Inductance L4 another termination 2V7 power supplys；Electric capacity C7-2 other end ground connection；Electric capacity C7-1 negative pole ground connection.
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