CN214253253U - Hand-held device - Google Patents
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- CN214253253U CN214253253U CN202023350124.2U CN202023350124U CN214253253U CN 214253253 U CN214253253 U CN 214253253U CN 202023350124 U CN202023350124 U CN 202023350124U CN 214253253 U CN214253253 U CN 214253253U
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Abstract
The application discloses a handheld device. The handheld device comprises a control chip, a radio frequency read-write chip, a radio frequency front-end circuit and a power circuit. The radio frequency read-write chip is connected with the control chip; the radio frequency front-end circuit is connected with the control chip and the radio frequency read-write chip; the power supply circuit comprises at least two branches, a first resistor and a first triode, wherein the input ends of the at least two branches are electrically connected, and the at least two branches comprise a first branch electrically connected with the radio frequency front-end circuit and a second branch electrically connected with the control chip; the enabling pin of the voltage converter in the first branch circuit is connected with the input end of the first triode, the input end of the first triode is electrically connected with the output end of the second branch circuit through the first resistor, the output end of the first triode is grounded, and the base level of the first triode is electrically connected with the first end of the control chip. The power consumption of the handheld device can be reduced, and the electric energy is saved.
Description
Technical Field
The application relates to the technical field of readers, in particular to a handheld device.
Background
The radio frequency identification technology has the advantages of long reading and writing distance, high safety and the like, and is widely applied to the industries of logistics, wine anti-counterfeiting, clothing and the like. The handheld device is used for sending a modulated wave signal to at least one tag, the tag receives power through the same modulated radio frequency carrier, the tag is activated to backscatter the signal, and a radio frequency read-write module in the handheld device is used for reading data stored in the tag by demodulating, amplifying, decoding and the like of the backscattering signal of the tag and rewriting the data of the tag.
The current handheld device also has the problems of large power consumption, electricity waste and the like.
SUMMERY OF THE UTILITY MODEL
The main objective of the present application is to provide a handheld device to reduce the power consumption of the handheld device and save the power.
In order to achieve the purpose, the technical scheme adopted by the application is as follows: a handheld device is provided, which comprises a control chip, a radio frequency read-write chip, a radio frequency front-end circuit and a power supply circuit.
The radio frequency read-write chip is connected with the control chip;
the radio frequency front-end circuit is connected with the control chip and the radio frequency read-write chip;
the power supply circuit comprises at least two branches, a first resistor and a first triode, wherein the input ends of the at least two branches are electrically connected, and the at least two branches comprise a first branch electrically connected with the radio frequency front-end circuit and a second branch electrically connected with the control chip;
the enabling pin of the voltage converter in the first branch circuit is connected with the input end of the first triode, the input end of the first triode is electrically connected with the output end of the second branch circuit through the first resistor, the output end of the first triode is grounded, and the base level of the first triode is electrically connected with the first end of the control chip.
The radio frequency front-end circuit comprises a voltage stabilizer and a power amplifier, an enabling pin of the voltage stabilizer is electrically connected with the second end of the control chip, an output end of the voltage stabilizer is electrically connected with a control end of the power amplifier, a radio frequency signal output end of the radio frequency read-write chip is electrically connected with an input end of the power amplifier, and an output end of the power amplifier is connected with the antenna.
Wherein, the radio frequency front-end circuit includes:
the radio frequency signal output end of the radio frequency read-write chip is electrically connected with the input end of the power amplifier through the filter, and the input end of the filter is connected with the output end of the filter through the first capacitor;
the output end of the power amplifier is connected with the input end of the transceiving isolation unit, the straight-through end of the transceiving isolation unit is connected with the antenna, the coupling end of the transceiving isolation unit is electrically connected with the first input end of the radio frequency read-write chip, and the isolation end of the transceiving isolation unit is electrically connected with the second input end of the radio frequency read-write chip;
and the coupling end of the transceiving isolation unit is electrically connected with the third end of the control chip through the power detector.
The handheld device comprises a first balance-unbalance converter and a second balance-unbalance converter, wherein a coupling end of the transceiving isolation unit is electrically connected with a first input end of the radio frequency read-write chip through the first balance-unbalance converter, and an isolation end of the transceiving isolation unit is electrically connected with a second input end of the radio frequency read-write chip through the second balance-unbalance converter.
The output end of the first branch circuit is connected with the power supply end of the power amplifier; the output end of the third branch of the at least two branches is connected with the input end of the voltage stabilizer;
the power supply circuit further comprises at least one sub-circuit, the input ends of all the sub-circuits are connected with the output end of the third branch circuit, the at least one sub-circuit comprises a first sub-circuit, a second sub-circuit and a third sub-circuit, the first sub-circuit is electrically connected with the power supply end and the input end of the power detector, and the second sub-circuit and the third sub-circuit are connected with the radio frequency read-write chip.
The power supply circuit further comprises a fourth resistor, a fifth resistor, a sixth resistor and a second triode;
the enabling pin of the voltage stabilizer in each sub-circuit is connected with the input end of the second triode, the output end of the second branch circuit is electrically connected with the input end of the second triode through the fourth resistor, the output end of the second branch circuit is electrically connected with the base level of the second triode through the fifth resistor and the sixth resistor, and the connecting end of the fifth resistor and the sixth resistor is electrically connected with the fourth end of the control chip.
The handheld device further comprises a temperature detector, the temperature detector is powered by a third branch of the at least two branches, and an output end of the temperature detector is connected with a fifth end of the control chip.
The handheld device further comprises at least one of a serial peripheral interface, a debugging interface and a universal asynchronous receiving and transmitting interface, and the serial peripheral interface, the debugging interface and the universal asynchronous receiving and transmitting interface are electrically connected with the control chip.
The handheld device comprises a first crystal resonator and a second crystal resonator, wherein the first crystal resonator is electrically connected with the radio frequency read-write chip, and the second crystal resonator is electrically connected with the control chip.
The first crystal resonator is a temperature compensation crystal resonator, and the first triode is an NPN triode.
The power circuit comprises a first branch circuit electrically connected with a radio frequency front-end circuit and a second branch circuit electrically connected with a control chip, wherein an enabling pin of a voltage converter in the first branch circuit is connected with an input end of a first triode, an input end of the first triode is electrically connected with an input end of the second branch circuit through a first resistor, an output end of the first triode is grounded, a base stage of the first triode is electrically connected with a first end of the control chip, so that under the condition that power is supplied to the control chip through the first branch circuit to enable the control chip to start operation, the on-off state of the first triode is controlled based on a control signal output by the first end of the control chip, the voltage of the input end of the first triode is controlled when the first triode is started, and the on-off state of the voltage converter in the first branch circuit can be changed due to the change of the voltage input end voltage of the first triode, thereby the on-off state of the first branch of handheld device accessible control chip control of this application to can make first branch be in the state of opening circuit through control chip when not needing receiving and dispatching radio frequency signal, can save the electric energy, and make the voltage of inputing voltage converter enable the foot in voltage converter bears the within range through first triode, with the protection voltage converter.
Drawings
FIG. 1 is a schematic block diagram of an embodiment of a handheld device of the present application;
FIG. 2 is a schematic block diagram of an embodiment of a power circuit in a handheld device of the present application;
FIG. 3 is a schematic block diagram of an embodiment of a handheld device of the present application;
FIG. 4 is a schematic diagram of an embodiment of an RF front-end circuit in a handheld device according to the present application;
FIG. 5 is a schematic diagram of an embodiment of a RF read/write chip in a handheld device according to the present application;
FIG. 6 is a diagram illustrating an embodiment of a control chip in a handheld device of the present application;
FIG. 7 is a diagram of an embodiment of a serial peripheral interface in a handheld device according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are referred to in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the various embodiments can be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a handheld device 1 according to an embodiment of the present application. The handheld device may be a handheld scanner or the like. As shown in fig. 1, the handheld device 1 includes a control chip 13, a radio frequency read-write chip 11, a radio frequency front-end circuit 14 and a power supply circuit 12.
The rf read-write chip 11 of the present application may be integrated with functions of rf signal modulation and demodulation, encoding and decoding, baseband signal spreading, etc. specified by the UHF protocol, and may also be integrated with a phase-locked loop, a voltage-controlled oscillator and/or a phase discriminator, etc. inside.
The power circuit 12 may be electrically connected to the control chip 13, the rf read/write chip 11, and the rf front-end circuit 14, so as to provide electric energy required by the operation of the control chip 13, the rf read/write chip 11, and the rf front-end circuit 14.
As shown in fig. 2, the power circuit 12 may include at least two branches, a first resistor R3, and a first triode Q1. The input ends of all the branches are electrically connected. The at least two branches include a first branch 121 and a second branch 122. The output end of the first branch 121 is electrically connected to the rf front-end circuit 14, and the output end of the second branch 122 is electrically connected to the control chip 13, so as to supply power to the rf front-end circuit 14 through the first branch 121 and supply power to the control chip 13 through the second branch 122.
Wherein, the enable pin of the voltage converter U1 in the first branch 121 is connected to the input terminal of the first transistor Q1, the input terminal of the first transistor Q1 is electrically connected to the output terminal of the second branch 122 through the first resistor R3, the output terminal of the first transistor Q1 is grounded, the base stage of the first transistor Q1 is electrically connected to the first terminal of the control chip 13, so that when the control chip 13 is powered by the second branch 122 to start operation, the switching state of the first transistor Q1 is controlled based on the control signal output from the first terminal of the control chip 13, and the voltage at the input terminal of the first transistor Q1 is controlled when the first transistor Q1 is turned on, and the switching state of the voltage converter U1 in the first branch 121 is changed by the change of the input terminal voltage at the input terminal of the first transistor Q1, so that the handheld device 1 of the present application can control the switching state of the first branch 121 through the control chip 13, therefore, the first branch 121 can be in the open state through the control chip 13 when the radio frequency signal does not need to be transmitted and received, the power can be saved, and the voltage input to the enabling pin of the voltage converter U1 is within the bearing range of the voltage converter U1 through the first triode Q1, so as to protect the voltage converter U1. The first transistor Q1 may be an NPN transistor, in which case the collector of the first transistor Q1 is the input terminal of the first transistor Q1, and the emitter of the first transistor Q1 is the output terminal of the first transistor Q1. Of course, in other embodiments, the first transistor Q1 may also be a PNP transistor, where the collector of the first transistor Q1 is the output of the first transistor Q1 and the emitter of the first transistor Q1 is the input of the first transistor Q1.
Optionally, the power circuit 12 may further include a second resistor R4 and a third resistor R5 connected in series, an output end of the second branch 122 is connected to the base of the first transistor Q1 through the second resistor R4 and the third resistor R5 connected in series, and one end of the second resistor R4 connected to the third resistor R5 is connected to the first end of the control chip 13, so that a divided voltage formed by the second resistor R4 and the third resistor R5 amplifies a change of the control signal output by the first end of the control chip 13, and when the change of the control signal output by the first end of the control chip 13 is small, the base voltage of the first transistor Q1 is also changed relatively greatly, so as to improve the control efficiency of the control chip 13.
As shown in fig. 3 and 4, the rf front-end circuit 14 of the present application may include a power amplifier 142, a voltage regulator 144, a filter 141, a transceiver isolation unit 143, and/or a power detector 145 to cooperate with the rf read/write chip 11 and the antenna 150 to implement receiving and transmitting of rf signals.
Illustratively, the radio frequency front-end circuit 14 includes a power amplifier 142, a filter 141, and a transmit-receive isolation unit 143. The radio frequency signal transmission process may include: the transmitting signal is firstly output to the filter 141 by the rf signal output end of the rf read-write chip 11, the filter 141 filters the transmitting signal and outputs the filtered transmitting signal to the power amplifier 142, the power amplifier 142 amplifies the power of the transmitting signal, the amplified transmitting signal is output to the antenna 150 by the transceiving isolation unit 143, and then the antenna 150 converts the transmitting signal into electromagnetic waves and radiates the electromagnetic waves into the air. The radio frequency signal receiving process may include: the tag signal is received by the antenna 150 and input to the input terminal of the rf read/write chip 11 through the transceiving isolation unit 143, so that the rf read/write chip 11 decodes the received signal. Specifically, the transceiving isolation unit 143 may convert the received signal into two paths of signals, where one path of signal is output from the isolation end of the transceiving isolation unit 143 to the rf read-write chip 11, and the other path of signal is output from the coupling end of the transceiving isolation unit 143 to the rf read-write chip 11. Alternatively, the same antenna 150 may be used for both the receive and transmit antennas 150, although different antennas 150 may be used.
The input end of the power amplifier 142 may be electrically connected to the rf signal output end of the rf read/write chip 11, and the output end of the power amplifier 142 is electrically connected to the antenna 150, so as to amplify the rf signal output by the rf read/write chip 11 through the power amplifier 142, and transmit the amplified signal to the antenna 150, so that the antenna 150 converts the rf signal into electromagnetic waves to be radiated.
The enable pin of the voltage stabilizer 144 is electrically connected to the second end of the control chip 13, and the output end of the voltage stabilizer 144 is electrically connected to the control gain end of the power amplifier 142, so that the on-off state of the voltage stabilizer 144 can be controlled by the control chip 13, and the working state of the power amplifier 142 is further controlled, so that the voltage of the control gain of the power amplifier 142 is a square wave with a certain duty ratio, the working mode of the power amplifier 142 is discontinuous, and the reduction of power consumption in different degrees is realized through the difference of the duty ratios.
Optionally, the filter 141 is disposed between the rf signal output end of the rf read-write chip 11 and the power amplifier 142, so as to filter the rf signal output by the rf read-write chip 11 through the filter 141 and output the filtered rf signal to the power amplifier 142, thereby reducing the out-of-band interference signal and the attenuation of the signal through the filter 141, and further implementing impedance matching. At least one capacitor, such as C21 and C22 of fig. 4, may be further disposed between the filter 141 and the power amplifier 142.
In addition, the transmitting/receiving isolation unit 143 is disposed between the power amplifier 142 and the antenna 150, and the transmitting/receiving isolation unit 143 may isolate the transmitting signal from the receiving signal and may also perform an impedance matching function. The transceiving isolation unit 143 of the present application may be a circulator or a coupler, but is not limited thereto. For example, the transceiving isolation unit 143 is a coupler, the output terminal of the power amplifier 142 is connected to the input terminal of the transceiving isolation unit 143, the through terminal of the transceiving isolation unit 143 is connected to the antenna 150, the coupling terminal of the transceiving isolation unit 143 is electrically connected to the first input terminal of the rf read/write chip 11, and the isolation terminal of the transceiving isolation unit 143 is electrically connected to the second input terminal of the rf read/write chip 11.
The coupling end of the transceiver isolation unit 143 is electrically connected to the third end of the control chip 13 through the power detector 145, so as to detect the power of the received signal or the transmitted signal through the power detector 145, and send the power of the received signal or the transmitted signal to the control chip 13, the control chip 13 can determine whether the power of the received signal or the transmitted signal is within a normal range and whether the circuit is in a normal working state, and can control the power front-end circuit based on the power of the received signal or the transmitted signal, so as to ensure the normal operation of the handheld device 1.
Optionally, to ensure the normal processing of the received signal by the rf read/write chip 11, as shown in fig. 5, a balun may be disposed between the transceiving isolation unit 143 in the receiving loop of the rf signal and the rf read/write chip 11, so as to process the unbalanced signal output by the transceiving isolation unit 143 into a balanced signal that can be analyzed and processed by the rf read/write chip 11 through the balun, and be received and decoded by the rf read/write chip 11. Illustratively, as shown in fig. 5, the handheld device 1 includes a first balun U14 and a second balun U13, a coupling end of the transceiving isolation unit 143 is electrically connected to a first input end of the rf read/write chip 11 through the first balun U14, and an isolation end of the transceiving isolation unit 143 is electrically connected to a second input end of the read/write chip through the second balun U13.
Further, an LCR matching circuit may be further disposed between the first balun U14 and the rf ic 11, so as to perform level and frequency matching and low-pass filtering on the balanced signal output by the first balun. The LCR matching circuit may include a first inductor L9, a second capacitor C47, and a third capacitor C48, the second capacitor C47 is connected between the first balun U14 and the rf read-write chip 11, the third capacitor C48 is connected between the first balun U14 and the rf read-write chip 11, one end of the first inductor L9 is connected to the line between the first balun U14 and the second capacitor C47, the other end of the first inductor L9 is connected to the line between the first balun U14 and the third capacitor C48, where the smaller the capacitance values of the second capacitor C48 and the third capacitor C48 are, the higher the frequency is, the better the bandwidth is, and the opposite is true.
Optionally, the handheld device 1 of the present application may further include a first crystal resonator Y1 electrically connected to the rf read/write chip 11, so as to generate a baseband signal source through the first crystal resonator Y1, and then convert the baseband signal source into an rf transmit signal through an internal phase-locked loop of the rf read/write chip 11. The first crystal resonator Y1 may be a temperature compensated crystal resonator.
In addition, as shown in fig. 6, the handheld device 1 may further include a second crystal resonator Y2 electrically connected to the control chip 13.
With continued reference to fig. 4, the handheld device 1 may further include a temperature detector U11, the temperature detector U11 is configured to detect the temperature inside the handheld device 1 and send the detected temperature to the fifth terminal of the control chip 13 through the output terminal of the temperature detector U11, and the control chip 13 may control the operating state of the power circuit 12 and/or the rf front-end circuit 14 based on the detected temperature to ensure the normal operation of the handheld device 1, so as to avoid the handheld device 1 from being too high to cause malfunction or burn out. Optionally, the input of the temperature detector U11 may be connected to a third branch 123 of the at least two branches to power the temperature detector U11 through the third branch 123 of the power circuit 12. In addition, the input and/or output of the temperature detector U11 may be further connected to a filter capacitor (C42, C43) to filter the signal input to the temperature detector U11 and/or the output signal of the temperature detector U11 via the filter capacitor (C42, C43). More specifically, the temperature detector may be configured to detect a temperature of the rf front-end circuit 14, and when the temperature of the rf front-end circuit is too high, control a duty ratio of an output signal at the second end of the control chip 13 to reduce power consumption of the power amplifier 142, so as to control the temperature of the rf front-end circuit 14 within an adaptive temperature range.
To match the devices in the handheld device 1, the power circuit 12 can convert an external power source (such as a lithium battery) into a power source suitable for the devices, so as to normally supply power to the whole system.
Specifically, with continued reference to fig. 2, the at least two branches may further include a third branch 123. The output terminal of the third branch 123 is connected to the input terminal of the voltage regulator 144 in the rf front-end circuit 14.
The power supply circuit 12 may further comprise at least one sub-circuit, the inputs of all sub-circuits being connected to the output of the third branch 123. Wherein the number of sub-paths is not limited. For example, the at least one sub-circuit includes three sub-circuits, i.e., a first sub-circuit 125, a second sub-circuit 124 and a third sub-circuit 126, wherein the first sub-circuit 125 is electrically connected to the power terminal and the input terminal of the power detector 145. The first sub-circuit 125, the second sub-circuit 124 and the third sub-circuit 126 are connected to the rf read/write chip. The second sub-circuit 124 may also be electrically connected to the first crystal resonator Y1.
The power circuit 12 may further include a fourth resistor R6, a fifth resistor R7, a sixth resistor R8, and a second transistor Q2. The enable pin of the voltage regulator (U4, U5, U6) in each sub-circuit is connected to the input terminal of the second transistor Q2, the output terminal of the second branch 122 is electrically connected to the input terminal of the second transistor Q2 through the fourth resistor R6, the output terminal of the second transistor Q2 is grounded, the base stage of the second transistor Q2 is electrically connected to the output terminal of the second branch 122 through the fifth resistor R7 and the sixth resistor R8 connected in series, the connection terminal of the fifth resistor R7 and the sixth resistor R8 is electrically connected to the fourth terminal of the control chip 13, the switching state of the second transistor Q2 can be controlled based on the control signal output from the fourth terminal of the control chip 13, the voltage at the input terminal of the second transistor Q2 is controlled when the second transistor Q2 is turned on, and the change of the voltage at the input terminal of the second transistor Q2 can change the switching state of the voltage regulator (U4, U5, U6) in the sub-circuit, so that the handheld device 1 of the present application can control the switching state of the chip 13, therefore, when the radio-frequency signals do not need to be transmitted and received, the first branch 121 and all sub-circuits can be in an open circuit state through the control chip 13, electric energy can be saved, and the voltage input to the enabling pins of the voltage regulators (U4, U5 and U6) is enabled to be within the bearing range of the voltage regulators (U4, U5 and U6) through the second triode Q2 so as to protect the voltage regulators (U4, U5 and U6). In addition, the voltage of each sub-circuit can be a square wave with a certain duty ratio through the control chip 13, and the reduction of power consumption in different degrees can be realized through the difference of the duty ratios. Similarly, the second transistor Q2 can also be an NPN transistor or a PNP transistor.
Optionally, as shown in fig. 6 and 7, the handheld device 1 further includes at least one of a serial peripheral interface J1, a debug interface J2, and a Universal Asynchronous Receiver Transmitter/Transmitter UART (Universal Asynchronous Receiver/Transmitter) interface J3. The serial peripheral interface J1, the debug interface J2, and the universal asynchronous receiver/transmitter interface J3 are electrically connected to the control chip 13.
In addition, test points may be provided on the power circuit 12 to facilitate testing. For example, as shown in fig. 2, it is assumed that the power supply circuit 12 includes 3 branches and 3 sub-paths, and one test point is provided on the output terminal of each branch and the output terminal of each sub-path, for a total of 6 test points.
The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.
Claims (10)
1. A handheld device, characterized in that the handheld device comprises:
a control chip;
the radio frequency read-write chip is connected with the control chip;
the radio frequency front-end circuit is connected with the control chip and the radio frequency read-write chip;
the power supply circuit comprises at least two branches, a first resistor and a first triode, wherein the input ends of the at least two branches are electrically connected, and the at least two branches comprise a first branch electrically connected with the radio frequency front-end circuit and a second branch electrically connected with the control chip;
the enabling pin of the voltage converter in the first branch circuit is connected with the input end of a first triode, the input end of the first triode is electrically connected with the output end of the second branch circuit through a first resistor, the output end of the first triode is grounded, and the base level of the first triode is electrically connected with the first end of the control chip.
2. The handheld device according to claim 1, wherein the rf front-end circuit includes a voltage stabilizer and a power amplifier, an enable pin of the voltage stabilizer is electrically connected to the second terminal of the control chip, an output terminal of the voltage stabilizer is electrically connected to the control terminal of the power amplifier, an rf signal output terminal of the rf read/write chip is electrically connected to an input terminal of the power amplifier, and an output terminal of the power amplifier is connected to the antenna.
3. The handheld device of claim 2, wherein the radio frequency front end circuit comprises:
the radio frequency signal output end of the radio frequency read-write chip is electrically connected with the input end of the power amplifier through the filter, and the input end of the filter is connected with the output end of the filter through a first capacitor;
the output end of the power amplifier is connected with the input end of the transceiving isolation unit, the straight-through end of the transceiving isolation unit is connected with an antenna, the coupling end of the transceiving isolation unit is electrically connected with the first input end of the radio frequency read-write chip, and the isolation end of the transceiving isolation unit is electrically connected with the second input end of the radio frequency read-write chip;
and the coupling end of the transceiving isolation unit is electrically connected with the third end of the control chip through the power detector.
4. The handheld device of claim 3, wherein the handheld device comprises a first balun and a second balun, a coupling end of the transceiving isolation unit is electrically connected to the first input end of the RF read/write chip through the first balun, and an isolation end of the transceiving isolation unit is electrically connected to the second input end of the RF read/write chip through the second balun.
5. The handheld device of claim 3 wherein the output of the first branch is connected to a power supply terminal of the power amplifier; the output end of a third branch of the at least two branches is connected with the input end of the voltage stabilizer;
the power supply circuit further comprises at least one sub-circuit, the input ends of all the sub-circuits are connected with the output end of the third branch circuit, the at least one sub-circuit comprises a first sub-circuit, a second sub-circuit and a third sub-circuit, the first sub-circuit is electrically connected with the power supply end and the input end of the power detector, and the second sub-circuit and the third sub-circuit are connected with the radio frequency read-write chip.
6. The handheld device of claim 5 wherein the power circuit further comprises a fourth resistor, a fifth resistor, a sixth resistor, and a second transistor;
the enabling pin of the voltage stabilizer in each sub-circuit is connected with the input end of the second triode, the output end of the second branch circuit is connected with the input end of the second triode through the fourth resistor, the output end of the second branch circuit is connected with the base level electric connection of the second triode through the fifth resistor and the sixth resistor, and the connecting end of the fifth resistor and the sixth resistor is connected with the fourth end electric connection of the control chip.
7. The handheld device of claim 1, further comprising a temperature detector powered by a third branch of the at least two branches, an output of the temperature detector being connected to a fifth terminal of the control chip.
8. The handheld device of claim 1, further comprising at least one of a serial peripheral interface, a debug interface, and a universal asynchronous transceiver interface, wherein the serial peripheral interface, the debug interface, and the universal asynchronous transceiver interface are electrically connected to the control chip.
9. The handheld device of claim 1, wherein the handheld device comprises a first crystal resonator and a second crystal resonator, the first crystal resonator is electrically connected to the rf read/write chip, and the second crystal resonator is electrically connected to the control chip.
10. The handheld device of claim 9, wherein the first crystal resonator is a temperature compensated crystal resonator and the first transistor is an NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023350124.2U CN214253253U (en) | 2020-12-31 | 2020-12-31 | Hand-held device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023350124.2U CN214253253U (en) | 2020-12-31 | 2020-12-31 | Hand-held device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214253253U true CN214253253U (en) | 2021-09-21 |
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| CN202023350124.2U Active CN214253253U (en) | 2020-12-31 | 2020-12-31 | Hand-held device |
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| CN (1) | CN214253253U (en) |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Handheld devices Granted publication date: 20210921 Pledgee: Nanjing Zidong sub branch of Bank of Nanjing Co.,Ltd. Pledgor: JIANGSU GOLDEN SKY INTELLIGENT TECHNOLOGY Co.,Ltd. Registration number: Y2024980019426 |