CN203894793U - RFID (Radio Frequency Identification) label - Google Patents
RFID (Radio Frequency Identification) label Download PDFInfo
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- CN203894793U CN203894793U CN201420326019.0U CN201420326019U CN203894793U CN 203894793 U CN203894793 U CN 203894793U CN 201420326019 U CN201420326019 U CN 201420326019U CN 203894793 U CN203894793 U CN 203894793U
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Abstract
The utility model relates to the field of RF technology, especially to an RFID label which comprises an RF reception circuit, a power-supply voltage stabilizing circuit, an RF demodulation circuit, a processor circuit, a sensor circuit, an RF switch circuit and an RF emission circuit. The RF reception circuit receives RF instruction signals and RF electromagnetic signals in the surrounding; the power-supply voltage stabilizing circuit collects and stores energy of the RF instruction signals and RF electromagnetic signals in the surrounding, and uses the energy as working power of the label; the RF demodulation circuit demodulates instruction signals from the detected RF instruction signals, and transmits the instruction signals to the processor circuit; the sensor circuit transmits collected monitoring signals to the processor circuit; the processor circuit is connected with the RF switch circuit; and the RF switch circuit is connected with the RF reception circuit and the RF emission circuit. According to the utility model, the intensity of RF signals emitted by the RFID label is higher, and the signal emission distance is longer.
Description
Technical field
The utility model relates to radio-frequency technique field, in particular to a kind of RFID tag.
Background technology
Radio frequency discrimination RFID system is a kind of radio frequency system, and it is widely used in the fields such as control, detection and target following.Usually rfid system comprises a radio frequency label read-write machine and a plurality of RFID tag.According to the power supply mode of RFID tag, RFID tag is divided into active rfid identification label and passive RFID tag.Wherein active rfid identification label relies on self-contained power supply to excite the work of each module in label, and passive RFID tag relies on the energy in the radiofrequency signal that gathers frequency read/write transmitting to obtain working power.
For passive RFID tag, the principle of its work is: radio frequency label read-write machine sends radiofrequency signal; The radiofrequency signal that RFID tag induction radio frequency label read-write machine sends, and utilize energy in radiofrequency signal to work energy is provided for self, RFID tag gathers the tag identification number of self particularly, built-in sensor gathers Monitoring Data, processor utilizes tag identification number and Monitoring Data to generate feedback signal, and by changing passive radio-frequency label antenna impedance, the radiofrequency signal of reflected radio tag read-write equipment transmitting, sends feedback signal; The feedback signal that radio frequency label read-write machine received RF identification label sends, and process being sent to information handling system after its demodulation.
Above-mentioned passive RFID tag, by changing antenna integrated radio frequency input impedance, the radiofrequency signal that reflected radio tag read-write equipment sends, thereby transmission feedback data, and the radiofrequency signal that radio frequency label read-write machine sends arrive passive radio-frequency (RF) tag after signal intensity very low, after the antenna-reflected of radio-frequency (RF) tag, signal intensity further weakens, thereby causes the communication distance of passive RFID tag more limited.
Utility model content
The purpose of this utility model is to provide a kind of RFID tag, to solve the above problems.
A kind of RFID tag is provided in embodiment of the present utility model, has comprised: radio-frequency (RF) receiving circuit, power supply mu balanced circuit, radio demodulating circuit, processor circuit, sensor circuit, radio-frequency switch circuit and radio-frequency transmissions circuit;
Described radio-frequency (RF) receiving circuit, the radio frequency command signal sending for received RF tag read-write equipment and the radio-frequency electromagnetic signal of environment, and described radio-frequency (RF) receiving circuit is connected with described power supply mu balanced circuit and described radio demodulating circuit respectively;
Described power supply mu balanced circuit, for the energy of described radio-frequency electromagnetic signal that gathers and store described radio frequency command signal and environment, as the working power of described radio-frequency (RF) tag, and its output terminal is connected with the power supply port of described radio demodulating circuit, described sensor circuit, described processor circuit, described radio-frequency switch circuit and described radio-frequency transmissions circuit respectively;
Described radio demodulating circuit, for detection of the change in voltage of the envelope signal of described radio frequency command signal, and demodulates the command signal of modulating in described radio frequency command signal according to the result detecting, and described command signal is sent to described processor circuit;
Described sensor circuit, for sending to described processor circuit by the monitor signal of collection;
Described processor circuit is connected with described radio-frequency switch circuit, and it is for generating for controlling the control signal of described radio-frequency switch circuit according to described command signal and described monitor signal;
Described radio-frequency switch circuit is connected with described radio-frequency (RF) receiving circuit and described radio-frequency transmissions circuit respectively; Described radio-frequency switch circuit, according to the low and high level state variation of described control signal, switches the variation of this circuit UNICOM and closed condition; And described radio-frequency switch circuit is also for described control signal being modulated to the radio-frequency carrier signal of the described radio frequency command signal of reception, and amplifies and launch by described radio-frequency transmissions circuit.
Preferably, described radio-frequency (RF) receiving circuit comprises: Microstrip Receiving Antenna and LC match circuit; The output terminal of described Microstrip Receiving Antenna is connected with the input end of described LC match circuit and the input end of described radio-frequency switch circuit respectively; The output terminal of described LC match circuit is connected with described power supply mu balanced circuit.
Preferably, described power supply mu balanced circuit comprises voltage multiplying circuit, charge pump circuit and DC-DC switch voltage-stabilizing circuit; Described voltage multiplying circuit, described charge pump circuit and described DC-DC switch voltage-stabilizing circuit connect successively, and the signal input port of described voltage multiplying circuit is connected with the signal output port of described LC match circuit; The output terminal of described DC-DC switch voltage-stabilizing circuit is connected with the power supply port of described radio demodulating circuit, described sensor circuit, described processor circuit, described radio-frequency switch circuit and described radio-frequency transmissions circuit respectively.
Preferably, described voltage multiplying circuit is single electrode voltage multiple circuit, comprising: capacitor C 1, diode D1, diode D2 and capacitor C 2; One end of described capacitor C 1 is to be connected with the output terminal of described LC match circuit as signal input port, its other end respectively with the negative electrode of described diode D1 and the anodic bonding of described diode D2; The plus earth of described diode D1, the negative electrode of described diode D2 is in parallel with one end of described capacitor C 2, and node in parallel is connected with the input end of charge pump circuit as multiplier electrode signal output port, the other end ground connection of described capacitor C 2; Or described voltage multiplying circuit is that two-stage voltage multiplying circuit comprises: capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, diode D1, diode D2, diode D3 and diode D4; One end of described capacitor C 1 is in parallel with one end of described capacitor C 3, and node in parallel is connected with the output terminal of described LC match circuit as signal input port; The other end of described capacitor C 1 respectively with the negative electrode of described diode D1 and the anodic bonding of described diode D2, the plus earth of described diode D1, the negative electrode of described diode D2 is connected with one end of described capacitor C 2 and the negative electrode of described diode D3, the other end ground connection of described capacitor C 2; The other end of described capacitor C 3 respectively with the negative electrode of described diode D3 and the anodic bonding of described diode D4; The negative electrode of described diode D4 is in parallel with one end of described capacitor C 4, and this node in parallel is connected with the signal input port of described charge pump circuit as multiplier electrode signal output port, the other end ground connection of described capacitor C 4.
Preferably, described charge pump circuit comprises charge pump chip and storage capacitor; Described charge pump chip comprises signal input port, signal output port, electric capacity connectivity port and grounding ports; Described electric capacity connectivity port is connected with one end of described storage capacitor, the other end ground connection of described storage capacitor; The signal input port of described charge pump chip is connected with the output terminal of described voltage multiplying circuit, and it described signal output port comprising is connected with the input end of described DC-DC switch voltage-stabilizing circuit; Described DC-DC switch voltage-stabilizing circuit, comprising: DC-DC switching power source chip, the first filter capacitor and the second filter capacitor; On described DC-DC switching power source chip, comprise first interface, the second interface and earth terminal, described first interface is in parallel with one end of described the first filter capacitor, this node in parallel is connected with the output terminal of described charge pump circuit as signal input port, the other end ground connection of described the first filter capacitor; Described the second interface is in parallel with one end of described the second filter capacitor, and this node in parallel is connected with the power supply port of described radio demodulating circuit, described sensor circuit, described processor circuit, described radio-frequency switch circuit and described radio-frequency transmissions circuit respectively as signal output port.
Preferably, described sensor circuit is 3-axis acceleration sensor circuit, comprises three-axis acceleration transducer chip and filter capacitor; Described three-axis acceleration transducer chip comprises the 3rd interface, image data output port and earth terminal; Described the 3rd interface is in parallel with one end of described filter capacitor, and this node in parallel is connected with the output terminal of described DC-DC switch voltage-stabilizing circuit as power supply port; Described image data output port is connected with the sensing data receiving port of described microcontroller circuit.
Preferably, described radio demodulating circuit comprises: capacitor C 1, capacitor C 2, diode D1, diode D2, comparer chip, cutoff frequency are the first low-pass filter of the first cutoff frequency, the second low-pass filter that cutoff frequency is the second cutoff frequency, wherein said the first cutoff frequency is less than described the second cutoff frequency, and the decay of described the first low-pass filter is higher than the decay of described the second low-pass filter; One end of described capacitor C 1 is connected with the output terminal of described LC demodulator circuit as signal input port, the other end of described capacitor C 1 respectively with the negative electrode of described diode D1 and the anodic bonding of described diode D2, the plus earth of described diode D1, the negative electrode of described diode D2 is connected with the input end of one end of described capacitor C 2, the input end of described the first low-pass filter and described the second low-pass filter respectively; The other end ground connection of described capacitor C 2, the output terminal of the output terminal of described the first low-pass filter and described the second low-pass filter is connected with described comparer chip respectively, and described comparer chip comprises the signal output port for being connected with described microcontroller circuit and the power supply port being connected for the output terminal with described DC-DC switch voltage-stabilizing circuit.
Preferably, described processor circuit comprises: microprocessor chip and filter capacitor; Described microprocessor chip comprises radio-frequency switch circuit control port, sensing data receiving port, demodulating data receiving port and the 4th interface; Described radio-frequency switch circuit control port is connected with described radio-frequency switch circuit, and described sensing data receiving port is connected with the output terminal of described sensor circuit, and described demodulating data receiving port is connected with the output terminal of described radio demodulating circuit; Described the 4th interface is in parallel with described filter capacitor, and this sys node is connected with the output terminal of described DC-DC switch voltage-stabilizing circuit with conduct power supply port.
Preferably, described radio-frequency switch circuit comprises: radio-frequency switch circuit chip and filter capacitor; On described radio-frequency switch circuit chip, comprise radiofrequency signal output port, radio-frequency (RF) signal input end mouth, control port, the 5th interface and grounding ports; Described radio-frequency (RF) signal input end mouth is connected with the output terminal of described Microstrip Receiving Antenna; Described radiofrequency signal output port is connected with the input end of described radio-frequency transmissions circuit; Described control port is connected with the described radio-frequency switch circuit control port of described microprocessor; Described the 5th interface is in parallel with one end of described filter capacitor, and this sys node is connected with the output terminal of described DC-DC switch voltage-stabilizing circuit as power supply port.
Preferably, described radio-frequency transmissions circuit comprises: micro-band emitting antenna and radio frequency amplifying circuit; Described radio frequency amplifying circuit comprises triode radio frequency amplification chip, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, capacitor C 5, inductance L 1, inductance L 2, resistance R 0, resistance R 1, resistance R 2 and resistance R 3; Described triode radio frequency amplification chip comprises the 6th interface, the 7th interface and grounding ports; Described the 6th interface is connected with one end of described capacitor C 1 and one end of described inductance L 1 respectively, and the other end of described capacitor C 1 is connected with the radiofrequency signal output port of described radio-frequency switch circuit as radio-frequency (RF) signal input end mouth; The other end of described inductance L 1 is connected with one end of described capacitor C 3 and one end of described resistance R 1 respectively, the other end ground connection of described capacitor C 3, the other end of described resistance is connected with one end of one end of described resistance R 3, one end of described capacitor C 5 and described resistance R 2 respectively; The other end of described resistance R 3 is that power supply port is connected with the output terminal of described DC-DC switch voltage-stabilizing circuit, the other end ground connection of described capacitor C 5, the other end of described resistance R 2 be connected with one end of described inductance L 2 and one end of described capacitor C 4 respectively, the other end of described inductance L 2 is connected with one end of described resistance R 0 and one end of described capacitor C 2 respectively, the other end ground connection of described capacitor C 4; The other end of described resistance R 0 is connected with described the 7th interface, and the other end of described capacitor C 2 is connected with described micro-receiving end with emitting antenna as amplifying signal output port.
In the utility model embodiment, the radio-frequency electromagnetic signal in RFID tag reception and collection environment is as operation power supply and carry out this locality storage; Utilize the carrier signal modulating baseband feedback signal of radio frequency label read-write machine transmitting; Transmitting after utilizing the power supply that gathers and store that the baseband feedback signal after modulation is amplified.The change dual-mode antenna radio-frequency (RF) impedance that the technical scheme of RFID tag transmitting feedback signal of the present utility model and existing RFID tag adopt, the carrier signal of reflected radio tag read-write equipment transmitting, thereby the scheme that sends feedback signal is compared, the radio-frequency (RF) signal strength of radio-frequency (RF) tag transmitting of the present utility model is stronger, and signal transmitting range is farther.
In the utility model embodiment, the power supply mu balanced circuit of radio-frequency (RF) tag is by the cooperation of voltage multiplying circuit (as DICKSON voltage multiplying circuit) and charge pump circuit, not only can gather radio-frequency electromagnetic signal fainter in environment and store as energy supplement signal, but also can obtain higher energy acquisition efficiency.
Accompanying drawing explanation
Fig. 1 shows a kind of structural representation of RFID tag in the utility model;
Fig. 2 shows the another kind of structural representation of RFID tag in the utility model;
Fig. 3 shows the circuit diagram of LC match circuit in the utility model embodiment;
Fig. 4 shows the circuit diagram of voltage multiplying circuit in the utility model embodiment;
Fig. 5 shows the circuit diagram of two-stage voltage multiplying circuit in the utility model embodiment;
Fig. 6 shows the circuit diagram of charge pump circuit in the utility model embodiment;
Fig. 7 shows the circuit diagram of DC-DC switch voltage-stabilizing circuit in the utility model embodiment;
Fig. 8 shows the circuit diagram of 3-axis acceleration sensor circuit in the utility model embodiment;
Fig. 9 shows the circuit diagram of radio demodulating circuit in the utility model embodiment;
Figure 10 shows the circuit diagram of processor circuit in the utility model embodiment;
Figure 11 shows the circuit diagram of radio-frequency switch circuit in the utility model embodiment;
Figure 12 shows the circuit diagram of radio frequency amplifying circuit in the utility model embodiment.
Embodiment
Below by specific embodiment, also by reference to the accompanying drawings the utility model is described in further detail.
The utility model embodiment provides a kind of RFID tag, as shown in Figure 1, this RFID tag mainly comprises: radio-frequency (RF) receiving circuit 1, power supply mu balanced circuit 2, radio demodulating circuit 3, processor circuit 4, sensor circuit 5, radio-frequency switch circuit 6 and radio-frequency transmissions circuit 7.Wherein radio-frequency (RF) receiving circuit 1, the radio frequency command signal sending for received RF tag read-write equipment and the radio-frequency electromagnetic signal of environment, and radio-frequency (RF) receiving circuit 1 is connected with power supply mu balanced circuit 2 and radio demodulating circuit 3 respectively; Power supply mu balanced circuit 2, for the energy of radio-frequency electromagnetic signal that gathers and store radio frequency command signal and environment, as the working power of radio-frequency (RF) tag, and its output terminal is connected with the power supply port of radio demodulating circuit 3, sensor circuit 5, processor circuit 4, radio-frequency switch circuit 6 and radio-frequency transmissions circuit 7 respectively; Radio demodulating circuit 3, for detection of the change in voltage of the envelope signal of radio frequency command signal, and demodulates the command signal of modulating in radio frequency command signal according to the result detecting, and command signal is sent to processor circuit 4; Sensor circuit 5, for sending to processor circuit 4 by the monitor signal of collection; Processor circuit 4 is connected with radio-frequency switch circuit 6, and it is for generating for controlling the feedback signal of radio-frequency switch circuit 6 according to above-mentioned command signal and monitor signal; Radio-frequency switch circuit 6 is connected with radio-frequency (RF) receiving circuit 1 and radio-frequency transmissions circuit 7 respectively; Radio-frequency switch circuit 6, according to the low and high level state variation of above-mentioned control signal, switches the variation of this circuit UNICOM and closed condition; And radio-frequency switch circuit 6 is also for be modulated to the radio-frequency carrier signal of the radio frequency command signal of reception using this control signal as RF FEEDBACK signal, and amplifies and launch by radio-frequency transmissions circuit 7.
Above-mentioned RFID tag, it comprises power supply mu balanced circuit 2, the radiofrequency signal that this power supply mu balanced circuit 2 can receive radio-frequency (RF) receiving circuit is converted to for the power supply of each module work of RFID tag storage, utilize the energy of storage initiatively to modulate, amplify and the radio-frequency carrier signal of transmitting rather than modulation and the transmitting of reflected radio tag read-write equipment, and then can improve the intensity of RFID tag transmitting feedback signal, increase RFID tag communication distance.
Below with reference to accompanying drawing, each circuit structure of RFID tag of the present utility model is elaborated.
As shown in Figure 2 a kind of concrete structure of RFID tag in the utility model.
In RFID tag as shown in Figure 2, radio-frequency (RF) receiving circuit 1 comprises: Microstrip Receiving Antenna 11 and LC match circuit 12; The output terminal of Microstrip Receiving Antenna 11 is connected with the input end of LC match circuit 12 and the input end of radio-frequency switch circuit 6 respectively; The output terminal of LC match circuit 12 is connected with power supply mu balanced circuit 2.
In above-mentioned radio-frequency (RF) receiving circuit 1, the radio-frequency electromagnetic signal of the radio frequency command signal that Microstrip Receiving Antenna 11 is sent for received RF tag read-write equipment and environment; Particularly, Microstrip Receiving Antenna 11 is that the microstrip line of collection signal frequency range centre frequency 1/4 wavelength forms by being printed on a segment length on printed circuit board (PCB), preferably, this microstrip line is printed on P.e.c. in the mode of serpentine, and this of microstrip line kind of shape set-up mode can reduce the board area that microstrip line takies.
As Fig. 3 shows the circuit diagram of LC match circuit 12 in above-mentioned radio-frequency (RF) receiving circuit 1.As can be seen from the figure, this circuit comprises variable capacitance C1 and variable inductance C2, and wherein one end of C1 and one end of C2 are in parallel, and node in parallel is connected with the output terminal of Microstrip Receiving Antenna 11 as aerial signal input port; The other end ground connection of C1, the other end of C2 is connected with the input end of power supply mu balanced circuit 2 as matched signal output port.In this LC match circuit 12, by suitably selecting the capacity value of C1 and C2, can make radio-frequency electromagnetic signal that Microstrip Receiving Antenna 11 gathers from environment to high efficiency of transmission in follow-up power supply mu balanced circuit 2.
As shown in Figure 2, the power supply mu balanced circuit 2 in the utility model embodiment comprises voltage multiplying circuit 21, charge pump circuit 22 and DC-DC switch voltage-stabilizing circuit 23; Voltage multiplying circuit 21, charge pump circuit 22 and DC-DC switch voltage-stabilizing circuit 23 connect successively, and the signal input port of voltage multiplying circuit 21 is connected with the signal output port of LC match circuit 12; The output terminal of DC-DC switch voltage-stabilizing circuit 23 is connected with the power supply port of radio demodulating circuit 3, sensor circuit 5, processor circuit 4, radio-frequency switch circuit 6 and radio-frequency transmissions circuit 7 respectively.More than the radiofrequency signal amplitude that wherein voltage multiplying circuit 21 can gather Microstrip Receiving Antenna 11 be amplified to the minimum voltage value that charge pump circuit 22 can gather; After further amplifying, voltage signal after charge pump circuit 22 amplifies voltage multiplying circuit 21 carries out buffer memory by the storage capacitor in charge pump circuit 22, when the accumulate voltage of storage capacitor surpasses after the discharge threshold of setting, charge pump circuit 22 is exported to DC-DC switch voltage-stabilizing circuit 23 by the voltage signal on storage capacitor; After the secure threshold of accumulate voltage on storage capacitor in charge pump circuit 22 lower than setting, charge pump circuit 22 stops to DC-DC switch voltage-stabilizing circuit 23 out-put supplies.
Above-mentioned voltage multiplying circuit 21 can be single electrode voltage multiple circuit 21, can be also two-stage voltage multiplying circuit 21, and wherein single electrode voltage multiple circuit 21 and two-stage voltage multiplying circuit 21 all can be realized by DICKSON voltage multiplying circuit 21.
As Fig. 4, when voltage multiplying circuit 21 is single electrode voltage multiple circuit, it mainly comprises: capacitor C 1, diode D1, diode D2 and capacitor C 2; Concrete syndeton is: one end of capacitor C 1 is for to be connected with the output terminal of LC match circuit 12 as signal input port, its other end respectively with the negative electrode of diode D1 and the anodic bonding of diode D2; The plus earth of diode D1, the negative electrode of diode D2 is in parallel with one end of capacitor C 2, and node in parallel is connected with the input end of charge pump circuit 22 as multiplier electrode signal output port, the other end ground connection of capacitor C 2.
As Fig. 5, when voltage multiplying circuit 21 is two-stage voltage multiplying circuit, it mainly comprises: capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, diode D1, diode D2, diode D3 and diode D4; Concrete syndeton is: one end of capacitor C 1 is in parallel with one end of capacitor C 3, and node in parallel is connected with the output terminal of LC match circuit 12 as signal input port; The other end of capacitor C 1 respectively with the negative electrode of diode D1 and the anodic bonding of diode D2, the plus earth of diode D1, the negative electrode of diode D2 is connected with one end of capacitor C 2 and the negative electrode of diode D3, the other end ground connection of capacitor C 2; The other end of capacitor C 3 respectively with the negative electrode of diode D3 and the anodic bonding of diode D4; The negative electrode of diode D4 is in parallel with one end of capacitor C 4, and this node in parallel is connected with the signal input port of charge pump circuit 22 as multiplier electrode signal output port, the other end ground connection of capacitor C 4.
As the circuit diagram of charge pump circuit 22 has been shown in Fig. 6, charge pump circuit 22 mainly comprises charge pump chip and storage capacitor as can be seen from Figure; Wherein charge pump chip comprises signal input port, signal output port, electric capacity connectivity port and grounding ports; Electric capacity connectivity port is connected with one end of storage capacitor, the other end ground connection of storage capacitor; The signal input port of charge pump chip is connected with the output terminal of voltage multiplying circuit 21, and it signal output port comprising is connected with the input end of DC-DC switch voltage-stabilizing circuit 23.
As Fig. 7 shows the circuit diagram of DC-DC switch voltage-stabilizing circuit 23, as can be seen from the figure DC-DC switch voltage-stabilizing circuit 23 mainly comprises: DC-DC switching power source chip, the first filter capacitor and the second filter capacitor; On DC-DC switching power source chip, comprise first interface, the second interface and earth terminal, first interface is in parallel with one end of the first filter capacitor, this node in parallel is connected with the output terminal of charge pump circuit 22 as signal input port, the other end ground connection of the first filter capacitor; The second interface is in parallel with one end of the second filter capacitor, and this node in parallel is connected with the power supply port of radio demodulating circuit 3, sensor circuit 5, processor circuit 4, radio-frequency switch circuit 6 and radio-frequency transmissions circuit 7 respectively as signal output port.
The power supply signal that above-mentioned DC-DC switch voltage-stabilizing circuit 23 can provide charge pump circuit 22 is converted to the required operating voltage of each component working of RFID tag, and the operating voltage being converted to is outputed to other each parts that RFID tag need to be powered.
Circuit diagram while showing sensor circuit 5 for 3-axis acceleration sensor circuit as Fig. 8,3-axis acceleration sensor circuit comprises three-axis acceleration transducer chip and filter capacitor as can be seen from Figure; Three-axis acceleration transducer chip comprises the 3rd interface, image data output port and earth terminal; The 3rd interface is in parallel with one end of filter capacitor, and this node in parallel is connected with the output terminal of DC-DC switch voltage-stabilizing circuit 23 as power supply port; Image data output port is connected with the sensing data receiving port of microcontroller circuit 4.
At above-mentioned 3-axis acceleration sensor circuit, can gather acceleration information and the temperature information of three direction in spaces of RFID tag, and by the image data output port of three-axis acceleration transducer chip, the data of collection be exported to microcontroller circuit 4.According to the needs of RFID tag image data, other can also be replaced and/or increase to three-axis acceleration transducer chip herein can be by the sensor chip of power supply mu balanced circuit 2 power supplies, to realize the acquisition function of other data.
As Fig. 9 shows the circuit diagram of radio demodulating circuit 3, radio demodulating circuit 3 comprises as can be seen from Figure: capacitor C 1, capacitor C 2, diode D1, diode D2, comparer chip, cutoff frequency are the first low-pass filter of the first cutoff frequency, the second low-pass filter that cutoff frequency is the second cutoff frequency, wherein the first cutoff frequency is less than the second cutoff frequency, and the decay of the first low-pass filter is higher than the decay of the second low-pass filter; One end of capacitor C 1 is connected with the output terminal of LC demodulator circuit as signal input port, the other end of capacitor C 1 respectively with the negative electrode of diode D1 and the anodic bonding of diode D2, the plus earth of diode D1, the negative electrode of diode D2 is connected with the input end of one end of capacitor C 2, the input end of the first low-pass filter and the second low-pass filter respectively; The other end ground connection of capacitor C 2, the output terminal of the output terminal of the first low-pass filter and the second low-pass filter is connected with comparer chip respectively, and comparer chip comprises the signal output port for being connected with microcontroller circuit 4 and the power supply port being connected for the output terminal with DC-DC switch voltage-stabilizing circuit 23.
In above-mentioned radio demodulating circuit 3, the radio frequency command signal that Microstrip Receiving Antenna 11 and LC match circuit 12 gather enters radio demodulating circuit 3 by signal input port.Capacitor C 1, capacitor C 2, diode D1, diode D2 form DICKSON voltage multiplying circuit, and this voltage multiplying circuit 21 the radio frequency command signal from signal input port input can be amplified and rectification is only to wrap the signal of forward voltage.The cutoff frequency of the first low-pass filter is lower and decay is higher, and after radio frequency command signal can being processed, the less and signal of amplitude of output rises and the lower signal of decline rate.The cutoff frequency of the second low-pass filter is higher and decay is lower, and after radio frequency command signal can being processed, amplitude of output is large and signal rises and decline rate signal faster.When the carrier envelope signal of signal input port input is by high step-down time, the output signal amplitude of the second low-pass filter will be less than the output signal of the first low-pass filter; When the carrier envelope signal of signal input port input is by low uprising time, the output signal amplitude of the second low-pass filter will be greater than the signal amplitude of the output signal of the first low-pass filter; The output signal of the first low-pass filter and the second low-pass filter is exported the digital signal that value is low and high level after comparator circuit is processed, and realizes the demodulation to the radio frequency command signal of signal input port input.
As Figure 10 shows the circuit diagram of processor circuit 4, processor circuit 4 mainly comprises as can be seen from Figure: microprocessor chip and filter capacitor; Microprocessor chip comprises radio-frequency switch circuit 6 control ports, sensing data receiving port, demodulating data receiving port and the 4th interface; Radio-frequency switch circuit 6 control ports are connected with radio-frequency switch circuit 6, and sensing data receiving port is connected with the output terminal of sensor circuit 5, and demodulating data receiving port is connected with the output terminal of radio demodulating circuit 3; The 4th interface is in parallel with filter capacitor, and this sys node is connected with the output terminal of DC-DC switch voltage-stabilizing circuit 23 with conduct power supply port.
Above-mentioned microcontroller circuit 4 reads the command signal that radio frequency label read-write machine sends from radio demodulating circuit 3 by demodulating data receiving port, by sensor data interface, read acceleration information and the temperature data of three direction in spaces, microprocessor chip utilizes command signal and sensing data to generate feedback signal, and by radio-frequency switch circuit 6 control ports, feedback signal is transferred to radio-frequency switch circuit 6.
As Figure 11 shows the circuit diagram of radio-frequency switch circuit 6, radio-frequency switch circuit 6 comprises as can be seen from Figure: radio-frequency switch circuit 6 chips and filter capacitor; On radio-frequency switch circuit 6 chips, comprise radiofrequency signal output port, radio-frequency (RF) signal input end mouth, control port, the 5th interface and grounding ports; Radio-frequency (RF) signal input end mouth is connected with the output terminal of Microstrip Receiving Antenna 11; Radiofrequency signal output port is connected with the input end of radio-frequency transmissions circuit 7; Control port is connected with radio-frequency switch circuit 6 control ports of microprocessor; The 5th interface is in parallel with one end of filter capacitor, and this sys node is connected with the output terminal of DC-DC switch voltage-stabilizing circuit 23 as power supply port.
The control port of above-mentioned radio-frequency switch circuit 6 is connected with radio-frequency switch circuit 6 control ports of microcontroller circuit 4, when radio-frequency switch circuit 6 control ports of microcontroller circuit 4 are exported high level, between the radio-frequency (RF) signal input end mouth of this circuit and radiofrequency signal output port in UNICOM's state, resistance step-down; When the radio-frequency switch circuit 6 control port output low level of microcontroller circuit 4, between the radio-frequency (RF) signal input end mouth of this circuit and radiofrequency signal output port, in blocking state, resistance uprises.The radio-frequency (RF) signal input end mouth of radio-frequency switch circuit 6 circuit connects Microstrip Receiving Antenna 11.When the radio-frequency switch circuit 6 control ports output high level of microcontroller circuit 4, radio-frequency switch circuit 6 is modulated to the feedback signal of microprocessor module transmission on the radio-frequency carrier signal that radio-frequency (RF) signal input end oral instructions enter by ASK (Amplitude Shift Keying amplitude shift keying) modulation system.When radio-frequency (RF) tag reader sends radio-frequency carrier signal, when microprocessor module sends feedback signal, the feedback signal that micro treatment module sends is just modulated on the radio-frequency carrier signal of Microstrip Receiving Antenna 11 receptions with ASK debud mode, and signal modulation being obtained by radio-frequency transmissions circuit 7 is launched.
As shown in Figure 2, radio-frequency transmissions circuit 7 comprises: micro-band emitting antenna 71 and radio frequency amplifying circuit 72.
As Figure 12 shows the physical circuit figure of radio frequency amplifying circuit 72, radio frequency amplifying circuit 72 comprises triode radio frequency amplification chip, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, capacitor C 5, inductance L 1, inductance L 2, resistance R 0, resistance R 1, resistance R 2 and resistance R 3 as can be seen from Figure; Triode radio frequency amplification chip comprises the 6th interface, the 7th interface and grounding ports; The 6th interface is connected with one end of capacitor C 1 and one end of inductance L 1 respectively, and the other end of capacitor C 1 is connected with the radiofrequency signal output port of radio-frequency switch circuit 6 as radio-frequency (RF) signal input end mouth; The other end of inductance L 1 is connected with one end of capacitor C 3 and one end of resistance R 1 respectively, the other end ground connection of capacitor C 3, and the other end of resistance is connected with one end of one end of resistance R 3, one end of capacitor C 5 and resistance R 2 respectively; The other end of resistance R 3 is that power supply port is connected with the output terminal of DC-DC switch voltage-stabilizing circuit 23, the other end ground connection of capacitor C 5, the other end of resistance R 2 be connected with one end of inductance L 2 and one end of capacitor C 4 respectively, the other end of inductance L 2 is connected with one end of resistance R 0 and one end of capacitor C 2 respectively, the other end ground connection of capacitor C 4; The other end of resistance R 0 is connected with the 7th interface, and the other end of capacitor C 2 is connected with micro-receiving end with emitting antenna 71 as amplifying signal output port.
Above-mentioned radio frequency amplifying circuit 72 is the cascode level amplifier circuits based on triode.This radio frequency amplifying circuit 72 is comprised of input matching circuit, output matching circuit, double pole triode, direct current biasing and electric source filter circuit.The function of this circuit is to be delivered to output port after input signal is amplified, and wherein C1, L1 and C3 mate the impedance of input signal source, obtain ceiling capacity transmission; R0, C2 and L2 carry out impedance matching to output load, obtain ceiling capacity transmission; C3, L1, R1, R3, C5, R2, L2 and C4 form direct current biasing and electric source filter circuit, and it is for arranging the DC point of triode radio frequency amplification chip and power supply being carried out to filtering.
Micro-in radio-frequency transmissions circuit 7 is that the microstrip line of collection signal frequency range centre frequency 1/4 wavelength forms with emitting antenna 71 by being printed on a segment length on printed circuit board (PCB), preferably, this microstrip line is printed on P.e.c. in the mode of serpentine, the board area taking to reduce this microstrip line.
Realizing in circuit of the RFID tag that the utility model patent provides, its diode used, preferably, is the Xiao Jite diode that trigger voltage is lower; In DICKSON voltage multiplying circuit 21, adopt the Xiao Jite diode that trigger voltage is lower, the energy acquisition that can make DICKSON voltage multiplying circuit 21 realize fainter radio-frequency electromagnetic signal; In charge pump circuit 22, adopt integrated form chip to realize voltage multiplication and memory function, can realize higher energy acquisition efficiency.
RFID tag in the utility model, by the cooperation of DICKSON voltage multiplying circuit 21 and charge pump circuit 22, not only can gather radio-frequency electromagnetic signal fainter in environment and store as energy supplement signal, but also can obtain higher energy acquisition efficiency.
Radio-frequency (RF) receiving circuit 1 in RFID tag in the utility model and radio demodulating circuit 3 adopt respectively independently circuit to realize, and it can be optimized respectively, can reach thus good circuit performance index.
In the utility model embodiment, the radio-frequency electromagnetic signal in RFID tag reception and collection environment is as operation power supply and carry out this locality storage; Utilize the carrier signal modulating baseband feedback signal of radio frequency label read-write machine transmitting; Transmitting after utilizing the power supply that gathers and store that the baseband feedback signal after modulation is amplified.The change dual-mode antenna radio-frequency (RF) impedance that the technical scheme of RFID tag transmitting feedback signal of the present utility model and existing RFID tag adopt, the carrier signal of reflected radio tag read-write equipment transmitting, thereby the scheme that sends feedback signal is compared, the radio-frequency (RF) signal strength of radio-frequency (RF) tag transmitting of the present utility model is stronger, and signal transmitting range is farther.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (10)
1. a RFID tag, is characterized in that, comprising: radio-frequency (RF) receiving circuit, power supply mu balanced circuit, radio demodulating circuit, processor circuit, sensor circuit, radio-frequency switch circuit and radio-frequency transmissions circuit;
Described radio-frequency (RF) receiving circuit, the radio frequency command signal sending for received RF tag read-write equipment and the radio-frequency electromagnetic signal of environment, and described radio-frequency (RF) receiving circuit is connected with described power supply mu balanced circuit and described radio demodulating circuit respectively;
Described power supply mu balanced circuit, for the energy of described radio-frequency electromagnetic signal that gathers and store described radio frequency command signal and environment, as the working power of described radio-frequency (RF) tag, and its output terminal is connected with the power supply port of described radio demodulating circuit, described sensor circuit, described processor circuit, described radio-frequency switch circuit and described radio-frequency transmissions circuit respectively;
Described radio demodulating circuit, for detection of the change in voltage of the envelope signal of described radio frequency command signal, and demodulates the command signal of modulating in described radio frequency command signal according to the result detecting, and described command signal is sent to described processor circuit;
Described sensor circuit, for sending to described processor circuit by the monitor signal of collection;
Described processor circuit is connected with described radio-frequency switch circuit, and it is for generating for controlling the control signal of described radio-frequency switch circuit according to described command signal and described monitor signal;
Described radio-frequency switch circuit is connected with described radio-frequency (RF) receiving circuit and described radio-frequency transmissions circuit respectively; Described radio-frequency switch circuit, according to the low and high level state variation of described control signal, switches the variation of this circuit UNICOM and closed condition; And described radio-frequency switch circuit is also for described control signal being modulated to the radio-frequency carrier signal of the described radio frequency command signal of reception, and amplifies and launch by described radio-frequency transmissions circuit.
2. RFID tag according to claim 1, is characterized in that, described radio-frequency (RF) receiving circuit comprises: Microstrip Receiving Antenna and LC match circuit;
The output terminal of described Microstrip Receiving Antenna is connected with the input end of described LC match circuit and the input end of described radio-frequency switch circuit respectively; The output terminal of described LC match circuit is connected with described power supply mu balanced circuit.
3. RFID tag according to claim 2, is characterized in that, described power supply mu balanced circuit comprises voltage multiplying circuit, charge pump circuit and DC-DC switch voltage-stabilizing circuit;
Described voltage multiplying circuit, described charge pump circuit and described DC-DC switch voltage-stabilizing circuit connect successively, and the signal input port of described voltage multiplying circuit is connected with the signal output port of described LC match circuit; The output terminal of described DC-DC switch voltage-stabilizing circuit is connected with the power supply port of described radio demodulating circuit, described sensor circuit, described processor circuit, described radio-frequency switch circuit and described radio-frequency transmissions circuit respectively.
4. RFID tag according to claim 3, is characterized in that, described voltage multiplying circuit is single electrode voltage multiple circuit, comprising: capacitor C 1, diode D1, diode D2 and capacitor C 2; One end of described capacitor C 1 is to be connected with the output terminal of described LC match circuit as signal input port, its other end respectively with the negative electrode of described diode D1 and the anodic bonding of described diode D2; The plus earth of described diode D1, the negative electrode of described diode D2 is in parallel with one end of described capacitor C 2, and node in parallel is connected with the input end of charge pump circuit as multiplier electrode signal output port, the other end ground connection of described capacitor C 2; Or,
Described voltage multiplying circuit is that two-stage voltage multiplying circuit comprises: capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, diode D1, diode D2, diode D3 and diode D4; One end of described capacitor C 1 is in parallel with one end of described capacitor C 3, and node in parallel is connected with the output terminal of described LC match circuit as signal input port; The other end of described capacitor C 1 respectively with the negative electrode of described diode D1 and the anodic bonding of described diode D2, the plus earth of described diode D1, the negative electrode of described diode D2 is connected with one end of described capacitor C 2 and the negative electrode of described diode D3, the other end ground connection of described capacitor C 2; The other end of described capacitor C 3 respectively with the negative electrode of described diode D3 and the anodic bonding of described diode D4; The negative electrode of described diode D4 is in parallel with one end of described capacitor C 4, and this node in parallel is connected with the signal input port of described charge pump circuit as multiplier electrode signal output port, the other end ground connection of described capacitor C 4.
5. RFID tag according to claim 3, is characterized in that, described charge pump circuit comprises charge pump chip and storage capacitor; Described charge pump chip comprises signal input port, signal output port, electric capacity connectivity port and grounding ports; Described electric capacity connectivity port is connected with one end of described storage capacitor, the other end ground connection of described storage capacitor; The signal input port of described charge pump chip is connected with the output terminal of described voltage multiplying circuit, and it described signal output port comprising is connected with the input end of described DC-DC switch voltage-stabilizing circuit;
Described DC-DC switch voltage-stabilizing circuit, comprising: DC-DC switching power source chip, the first filter capacitor and the second filter capacitor; On described DC-DC switching power source chip, comprise first interface, the second interface and earth terminal, described first interface is in parallel with one end of described the first filter capacitor, this node in parallel is connected with the output terminal of described charge pump circuit as signal input port, the other end ground connection of described the first filter capacitor; Described the second interface is in parallel with one end of described the second filter capacitor, and this node in parallel is connected with the power supply port of described radio demodulating circuit, described sensor circuit, described processor circuit, described radio-frequency switch circuit and described radio-frequency transmissions circuit respectively as signal output port.
6. RFID tag according to claim 3, is characterized in that, described sensor circuit is 3-axis acceleration sensor circuit, comprises three-axis acceleration transducer chip and filter capacitor; Described three-axis acceleration transducer chip comprises the 3rd interface, image data output port and earth terminal; Described the 3rd interface is in parallel with one end of described filter capacitor, and this node in parallel is connected with the output terminal of described DC-DC switch voltage-stabilizing circuit as power supply port; Described image data output port is connected with the sensing data receiving port of described microcontroller circuit.
7. RFID tag according to claim 3, it is characterized in that, described radio demodulating circuit comprises: capacitor C 1, capacitor C 2, diode D1, diode D2, comparer chip, cutoff frequency are the first low-pass filter of the first cutoff frequency, the second low-pass filter that cutoff frequency is the second cutoff frequency, wherein said the first cutoff frequency is less than described the second cutoff frequency, and the decay of described the first low-pass filter is higher than the decay of described the second low-pass filter;
One end of described capacitor C 1 is connected with the output terminal of described LC demodulator circuit as signal input port, the other end of described capacitor C 1 respectively with the negative electrode of described diode D1 and the anodic bonding of described diode D2, the plus earth of described diode D1, the negative electrode of described diode D2 is connected with the input end of one end of described capacitor C 2, the input end of described the first low-pass filter and described the second low-pass filter respectively; The other end ground connection of described capacitor C 2, the output terminal of the output terminal of described the first low-pass filter and described the second low-pass filter is connected with described comparer chip respectively, and described comparer chip comprises the signal output port for being connected with described microcontroller circuit and the power supply port being connected for the output terminal with described DC-DC switch voltage-stabilizing circuit.
8. RFID tag according to claim 3, is characterized in that, described processor circuit comprises: microprocessor chip and filter capacitor; Described microprocessor chip comprises radio-frequency switch circuit control port, sensing data receiving port, demodulating data receiving port and the 4th interface; Described radio-frequency switch circuit control port is connected with described radio-frequency switch circuit, and described sensing data receiving port is connected with the output terminal of described sensor circuit, and described demodulating data receiving port is connected with the output terminal of described radio demodulating circuit; Described the 4th interface is in parallel with described filter capacitor, and this sys node is connected with the output terminal of described DC-DC switch voltage-stabilizing circuit with conduct power supply port.
9. RFID tag according to claim 8, is characterized in that, described radio-frequency switch circuit comprises: radio-frequency switch circuit chip and filter capacitor; On described radio-frequency switch circuit chip, comprise radiofrequency signal output port, radio-frequency (RF) signal input end mouth, control port, the 5th interface and grounding ports; Described radio-frequency (RF) signal input end mouth is connected with the output terminal of described Microstrip Receiving Antenna; Described radiofrequency signal output port is connected with the input end of described radio-frequency transmissions circuit; Described control port is connected with the described radio-frequency switch circuit control port of described microprocessor; Described the 5th interface is in parallel with one end of described filter capacitor, and this sys node is connected with the output terminal of described DC-DC switch voltage-stabilizing circuit as power supply port.
10. RFID tag according to claim 3, is characterized in that, described radio-frequency transmissions circuit comprises: micro-band emitting antenna and radio frequency amplifying circuit;
Described radio frequency amplifying circuit comprises triode radio frequency amplification chip, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, capacitor C 5, inductance L 1, inductance L 2, resistance R 0, resistance R 1, resistance R 2 and resistance R 3;
Described triode radio frequency amplification chip comprises the 6th interface, the 7th interface and grounding ports;
Described the 6th interface is connected with one end of described capacitor C 1 and one end of described inductance L 1 respectively, and the other end of described capacitor C 1 is connected with the radiofrequency signal output port of described radio-frequency switch circuit as radio-frequency (RF) signal input end mouth; The other end of described inductance L 1 is connected with one end of described capacitor C 3 and one end of described resistance R 1 respectively, the other end ground connection of described capacitor C 3, the other end of described resistance is connected with one end of one end of described resistance R 3, one end of described capacitor C 5 and described resistance R 2 respectively; The other end of described resistance R 3 is that power supply port is connected with the output terminal of described DC-DC switch voltage-stabilizing circuit, the other end ground connection of described capacitor C 5, the other end of described resistance R 2 be connected with one end of described inductance L 2 and one end of described capacitor C 4 respectively, the other end of described inductance L 2 is connected with one end of described resistance R 0 and one end of described capacitor C 2 respectively, the other end ground connection of described capacitor C 4; The other end of described resistance R 0 is connected with described the 7th interface, and the other end of described capacitor C 2 is connected with described micro-receiving end with emitting antenna as amplifying signal output port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420326019.0U CN203894793U (en) | 2014-06-18 | 2014-06-18 | RFID (Radio Frequency Identification) label |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420326019.0U CN203894793U (en) | 2014-06-18 | 2014-06-18 | RFID (Radio Frequency Identification) label |
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| Publication Number | Publication Date |
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| CN203894793U true CN203894793U (en) | 2014-10-22 |
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| CN201420326019.0U Expired - Fee Related CN203894793U (en) | 2014-06-18 | 2014-06-18 | RFID (Radio Frequency Identification) label |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106599972A (en) * | 2015-10-16 | 2017-04-26 | 中国科学院上海高等研究院 | Super-high-frequency RFID tag chip impedance self-adaption circuit and realization method thereof |
| CN107570429A (en) * | 2017-08-31 | 2018-01-12 | 重庆旭永科技发展有限公司 | A kind of logistics weighing sorting system |
| CN108462512A (en) * | 2017-02-22 | 2018-08-28 | 三星电子株式会社 | Near-field communication equipment |
| CN110110838A (en) * | 2019-06-24 | 2019-08-09 | 电子科技大学中山学院 | Intelligent computable radio frequency identification tag |
| CN110147694A (en) * | 2019-06-15 | 2019-08-20 | 吴新胜 | A kind of RF front-end circuit and radio frequency tag circuit |
| CN110889480A (en) * | 2019-12-23 | 2020-03-17 | 浙江悦和科技有限公司 | Passive sensing circuit and control method thereof |
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2014
- 2014-06-18 CN CN201420326019.0U patent/CN203894793U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106599972A (en) * | 2015-10-16 | 2017-04-26 | 中国科学院上海高等研究院 | Super-high-frequency RFID tag chip impedance self-adaption circuit and realization method thereof |
| CN106599972B (en) * | 2015-10-16 | 2019-10-25 | 中国科学院上海高等研究院 | Ultra-high frequency RFID label chip impedance adaptive circuit and its implementation |
| CN108462512A (en) * | 2017-02-22 | 2018-08-28 | 三星电子株式会社 | Near-field communication equipment |
| CN108462512B (en) * | 2017-02-22 | 2022-01-25 | 三星电子株式会社 | Near field communication device |
| CN107570429A (en) * | 2017-08-31 | 2018-01-12 | 重庆旭永科技发展有限公司 | A kind of logistics weighing sorting system |
| CN110147694A (en) * | 2019-06-15 | 2019-08-20 | 吴新胜 | A kind of RF front-end circuit and radio frequency tag circuit |
| CN110147694B (en) * | 2019-06-15 | 2022-04-26 | 上海航空印刷有限公司 | Radio frequency front-end circuit and radio frequency tag circuit |
| CN110110838A (en) * | 2019-06-24 | 2019-08-09 | 电子科技大学中山学院 | Intelligent computable radio frequency identification tag |
| CN110889480A (en) * | 2019-12-23 | 2020-03-17 | 浙江悦和科技有限公司 | Passive sensing circuit and control method thereof |
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Granted publication date: 20141022 Termination date: 20180618 |