CN211742134U - Power supply control circuit applied to power amplifier in ultrahigh frequency reader-writer - Google Patents
Power supply control circuit applied to power amplifier in ultrahigh frequency reader-writer Download PDFInfo
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- CN211742134U CN211742134U CN202020557672.3U CN202020557672U CN211742134U CN 211742134 U CN211742134 U CN 211742134U CN 202020557672 U CN202020557672 U CN 202020557672U CN 211742134 U CN211742134 U CN 211742134U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The utility model belongs to the technical field of ultrahigh frequency RFID, and relates to a power supply control circuit applied to a power amplifier in an ultrahigh frequency reader-writer, which comprises a power circuit, a radio frequency processor circuit and a power amplifier circuit, wherein the power circuit is connected with the radio frequency processor circuit; the power supply circuit is connected with the power amplifier circuit; the radio frequency processor circuit is connected with the power amplifier circuit. The utility model discloses, under the condition that does not influence the normal work of hyperfrequency, the power consumption of module has been saved greatly, has reduced the calorific capacity of module to reduced the consumption at handheld terminal, under the limited condition of handheld terminal battery power, its usable time is longer, effectively avoids the electricity back power amplifier chip on the hyperfrequency module to be in operating condition always, and power consumption is big, the short problem of operating time.
Description
Technical Field
The utility model belongs to the technical field of switching power supply, a power amplifier's power supply control circuit is related to, especially, relate to a power amplifier's power supply control circuit in being applied to hyperfrequency read write line.
Background
In recent years, the ultrahigh frequency identification technology has been widely applied all over the world, and the development of China in this respect is still in the beginning, but the ultrahigh frequency identification technology is a new automatic identification technology and has been developed rapidly in recent years. Especially, ultrahigh frequency readers and electronic tags have been applied in some service industries, especially, ultrahigh frequency readers are more commonly used in handheld terminals, and at present, after the existing ultrahigh frequency readers are powered on, a power amplifier chip is always in a working state, so that the power consumption is high, and the working time is short.
SUMMERY OF THE UTILITY MODEL
To the technical problem that current hyperfrequency module power consumption is big, power consumption is big and operating time is short, the utility model provides a be applied to power amplifier's power supply control circuit in hyperfrequency read write line, under the condition that does not influence the normal work of hyperfrequency, saved the power consumption of module greatly, reduced the calorific capacity of module to reduce the consumption at handheld terminal, under the limited condition of handheld terminal battery power, the time of use is longer.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a power supply control circuit applied to a power amplifier in an ultrahigh frequency reader-writer comprises a power supply circuit, a radio frequency processor circuit and a power amplifier circuit; the power supply circuit is respectively connected with the radio frequency processor circuit and the power amplifier circuit; the radio frequency processor circuit is connected with the power amplifier circuit.
The radio frequency processor circuit comprises a radio frequency processor chip U7, a clock source circuit, a radio frequency matching circuit and a power supply filter circuit; the radio frequency processor chip U7 is respectively connected with the clock source circuit, the radio frequency matching circuit and the power supply filter circuit; the radio frequency processor chip U7 is respectively connected with the power supply circuit and the power amplifier circuit.
The clock source circuit comprises a crystal oscillator Y1, a capacitor C23 and a capacitor C24;
the crystal oscillator Y1 comprises a pin 1, a pin 2, a pin 3 and a pin 4; and one end of the capacitor C24 are both grounded;
one end of the capacitor C23 is grounded; the other end of the capacitor C23 is connected with a pin 1 in parallel and then is connected with a radio frequency processor chip U7; one end of the capacitor C24 is connected with the 4 pins in parallel and then grounded; the other end of the capacitor C24 is connected with a pin 3 in parallel and then is connected with a radio frequency processor chip U7.
The power supply filter circuit comprises a resistor 40, a resistor 41, a capacitor C124, a capacitor C125, a capacitor C126, a capacitor C127, a capacitor C128 and a capacitor C129;
one end of the capacitor C124 and one end of the capacitor C125 are both grounded and are connected with the radio frequency processor chip U7; the other end of the capacitor C124 and the other end of the capacitor C125 are both connected with a radio frequency processor chip U7;
the capacitor C126 is connected with the capacitor C127 in parallel, and one end of the capacitor C126 and one end of the capacitor C127 are both grounded; the other end of the capacitor C126 and the other end of the capacitor C127 are both connected with a radio frequency processor chip U7;
one end of the capacitor C128 is grounded, and the other end of the capacitor C128 is connected with the radio frequency processor chip U7;
one end of the capacitor C129 is grounded, and the other end of the capacitor C129 is connected with the radio frequency processor chip U7;
one end of the resistor 40 and one end of the resistor 41 are both connected with the radio frequency processor chip U7, and the other ends of the resistor 40 and the resistor 41 are respectively connected with the power amplifier circuit.
The radio frequency matching circuit comprises an inductor L3, an inductor L4, an inductor L9 and a capacitor C47;
the inductor L4 is connected with the inductor L9 in parallel; one end of the inductor L9 and one end of the inductor L4 are both grounded; the other end of the inductor L4 is connected with one end of an inductor L3 and one end of a capacitor C47 respectively; the other end of the inductor L3 is connected with a radio frequency processing chip U7; the other end of the inductor L9 is connected with the other end of the capacitor C47 and the power amplifier circuit respectively.
The power supply circuit comprises a power supply filter circuit and a power amplifier power supply control circuit which are connected with each other; the power supply filter circuit and the power amplifier power supply control circuit are both connected with a radio frequency processor chip U7; the power amplifier power supply control circuit is connected with the power amplifier circuit.
The power supply filter circuit comprises a power supply VCC _33, a resistor R106, a capacitor C31, a capacitor C32 and a capacitor C20;
the capacitor C31, the capacitor C32 and the capacitor C20 are connected in parallel, one end of each capacitor is respectively connected with the power supply VCC _33 and the resistor R106, and the other end of each capacitor is grounded; the other end of the power supply VCC _33 is connected with an external connector; the resistor R106 is respectively connected with the radio frequency processor chip U7 and the power amplifier power supply control circuit.
The power amplifier power supply control circuit comprises a resistor R107, a resistor R123, a resistor R2, a triode Q1 and a transistor U14;
the transistor U14 comprises a transistor No. 1 pin, a transistor No. 2 pin and a transistor No. 3 pin; the transistor Q1 comprises a first terminal of a transistor Q1, a second terminal of a transistor Q1 and a third terminal of a transistor Q1;
the first end of the triode Q1 is grounded, and the second end of the triode Q1 is connected with the radio frequency processor chip U7 through a resistor R107; the third end of the triode Q1 is connected with the 1 st pin of the transistor through a resistor R123 and is connected with a resistor R106 through a resistor R2;
the No. 2 pin of the transistor is connected with a resistor R106; and the 3 rd pin of the transistor is connected with the power amplifier circuit.
The power amplifier circuit comprises a power supply VCC _ PA, a power amplifier chip U13, a capacitor C25, a capacitor C41, a capacitor C26, a capacitor C42, an inductor L12, a resistor R34, an inductor L10, a capacitor C39, a capacitor C45, an inductor L11, a capacitor C46, a resistor R30, an inductor R31 and a capacitor C44;
the power supply VCC _ PA is connected with the 3 rd pin of the transistor; the power amplifier chip U13 is respectively connected with the resistor 40 and the resistor 41; the power amplifier chip U13 is connected with the other end of the inductor L9;
after the capacitor C25 and the capacitor C41 are connected in parallel, one end of each capacitor is grounded; the other end of the resistor is respectively connected with the power amplifier chip U13 and one end of the resistor R36; the other end of the resistor R36 is connected with a radio frequency processor chip U7;
the capacitor C26 and the capacitor C42 are connected in parallel, and one end of each capacitor is grounded; the other end is divided into two paths, and one path is connected with a power amplifier chip U13 through an inductor L12; the other path is connected with a power supply VCC _ PA through a resistor R34;
after the capacitor C44 is connected with the resistor R31 in parallel, one end of the capacitor C44 is grounded, and the other end of the capacitor C44 is connected with one end of the power amplifier chip U13 and one end of the resistor R30 respectively; the other end of the resistor R30 is connected with one end of a capacitor C46, a power supply VCC _ PA and one end of an inductor L11 respectively; the other end of the capacitor C46 is grounded; the other end of the inductor L11 is connected with one end of a power amplifier chip U13 and one end of an inductor L10 respectively; the other end of the inductor L10 is connected with one end of a capacitor C39 and one end of a capacitor C45 respectively; the other end of the capacitor C39 is grounded; the other end of the capacitor C45 is connected with the antenna unit.
The power amplifier chip U13 is of a type RFPA 0133; the model number of the radio frequency processor chip U7 is M100.
The utility model has the advantages of it is following:
1. in this embodiment, the power supply control circuit includes a power supply circuit, a radio frequency processor circuit and a power amplifier circuit, and when the ultrahigh frequency module starts to work, the power supply control circuit sends a tag reading instruction to the radio frequency control unit, and the radio frequency unit generates a radio frequency signal and sends a high level to a triode of the power supply unit through an IO port to control the conduction of a transistor, so as to realize the power supply of the power amplifier unit; when the ultrahigh frequency module stops working, a tag reading stopping instruction is sent to the radio frequency control unit, the radio frequency processing unit stops working and sends a low level to a triode of the power supply unit through the IO port to control the disconnection of the transistor, so that the power supply is cut off and the power supply to the power amplifier unit through the transistor is cut off, the working state of a chip of the power amplifier can be effectively controlled, the power consumption of the module is greatly saved under the condition that the normal work of the ultrahigh frequency module is not influenced, the heat productivity of the module is reduced, and the purpose of reducing the power consumption is achieved.
2. The utility model discloses in, radio frequency processor chip U7's model M100, it is the radio frequency processor chip of the kernel that has integrateed 51 singlechips, after radio frequency processor chip U7 received the label instruction of reading, radio frequency processor chip U7 exports radio frequency signal to power amplifier chip U13, radio frequency processor chip U7 puts high the IO mouth level of being connected with power amplifier power control circuit simultaneously, switch on power supply circuit's triode Q1, transistor U14's grid level is drawn low, transistor U14 source electrode and drain electrode switch on, power amplifier chip circular telegram succeeds and begins work, carry out power amplification with received radio frequency signal and export; when the radio frequency processor chip U7 receives the instruction of stopping reading the tag, the radio frequency processor chip U7 stops outputting the radio frequency signal, meanwhile, the radio frequency processor chip U7 sets the level of the IO port connected with the power supply control circuit of the power amplifier low, the collector and the emitter of the triode Q1 of the power supply circuit are disconnected, the grid of the transistor U14 recovers the high level, the source and the drain of the transistor U14 are disconnected, and the power amplifier chip is powered off and stops working. The utility model discloses a this scheme control power amplifier switches on and off, greatly reduced the consumption of hyperfrequency module, it is long when handheld terminal use hyperfrequency module work has also increased the use of battery.
Drawings
Fig. 1 is a schematic diagram of a frame principle of a power supply control circuit applied to a power amplifier in an ultrahigh frequency reader-writer according to the present invention;
fig. 2 is a schematic diagram of a radio frequency processor circuit employed by the present invention;
FIG. 3 is a schematic diagram of a power supply circuit employed by the present invention;
fig. 4 is a schematic diagram of a power amplifier circuit employed by the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Examples
Referring to fig. 1, the utility model provides a power supply control circuit applied to a power amplifier in an ultrahigh frequency reader-writer, which comprises a power supply circuit, a radio frequency processor circuit and a power amplifier circuit; the power supply circuit is connected with the radio frequency processor circuit; the radio frequency processor circuit is connected with the power amplifier circuit; the power amplifier circuit is connected with the power supply circuit.
Referring to fig. 2, the rf processor circuit of the present invention includes an rf processor chip, a clock source circuit, an rf matching circuit, and a power supply filter circuit; the clock source circuit, the radio frequency matching circuit and the power supply filter circuit are respectively connected with the radio frequency processor chip.
In this embodiment, the clock source circuit includes a crystal oscillator Y1, a capacitor C23, and a capacitor C24.
In this embodiment, the crystal oscillator Y1 includes pins 1, 2, 3, and 4; and one end of the capacitor C24 are both grounded; one end of the capacitor C23 is grounded; the other end of the capacitor C23 is connected with a pin 1 in parallel and then is connected with a radio frequency processor chip U7; one end of the capacitor C24 is grounded after being connected with the 4 pins in parallel; the other end of the capacitor C24 is connected with the pin 3 in parallel and then is connected with the radio frequency processor chip U7.
The radio frequency processor chip U7 is connected with a capacitor C23 in series and is grounded; the radio frequency processor chip U7 is connected with a capacitor C24 in series and is grounded; the pins 13 and 14 of the RF processor chip U7 are connected to the pins 3 and 1 of the crystal oscillator Y1, respectively, and the pins 2 and 4 of the crystal oscillator Y1 are grounded, respectively.
The power supply filtering circuit comprises a resistor 40, a resistor 41, a capacitor C124, a capacitor C125, a capacitor C126, a capacitor C127, a capacitor C128 and a capacitor C129; one end of the capacitor C124 and one end of the capacitor C125 are both grounded and are connected with the radio frequency processor chip U7; the other end of the capacitor C124 and the other end of the capacitor C125 are both connected with the radio frequency processor chip U7; the capacitor C126 is connected with the capacitor C127 in parallel, and one end of the capacitor C126 and one end of the capacitor C127 are both grounded; the other end of the capacitor C126 and the other end of the capacitor C127 are both connected with a radio frequency processor chip U7; one end of the capacitor C128 is grounded, and the other end of the capacitor C128 is connected with the radio frequency processor chip U7; one end of the capacitor C129 is grounded, and the other end of the capacitor C129 is connected with the radio frequency processor chip U7; one end of the resistor 40 and one end of the resistor 41 are both connected with the radio frequency processor chip U7, and the other ends of the resistor 40 and the resistor 41 are respectively connected with the power amplifier circuit.
In this embodiment, the rf processor chip U7 is connected in series with the capacitor C124, the capacitor C125, the capacitor C126, the capacitor C127, the capacitor C128, and the capacitor C129, respectively, and then grounded.
The radio frequency matching circuit comprises an inductor L3, an inductor L4, an inductor L9 and a capacitor C47, wherein the inductor L4 is connected with an inductor L9 in parallel; one end of the inductor L9 and one end of the inductor L4 are both grounded; the other end of the inductor L4 is connected with one end of an inductor L3 and one end of a capacitor C47 respectively; the other end of the inductor L3 is connected with a radio frequency processing chip U7; the other end of the inductor L9 is connected with the other end of the capacitor C47 and the power amplifier circuit respectively.
In the embodiment, the radio frequency processor chip U7 is connected in series with the inductor L3 and the capacitor C47 and then connected with the power amplifier circuit, the inductor L4 and the inductor L9 are connected in parallel at two ends of the capacitor C47 and grounded, and form a pi-type LC filter circuit with the capacitor C47; the pin 24 of the rf processor chip U7 is connected to the resistor R107 of the power supply circuit. The model of the radio frequency processor chip is M100.
The radio frequency processor chip U7 is respectively connected with the clock source circuit, the radio frequency matching circuit and the power supply filter circuit; the power supply filtering circuit filters the power supply supplied to the radio frequency processor chip to ensure that the radio frequency processor chip can work stably; the clock source circuit provides clock signals for the radio frequency processor chip U7, when the radio frequency processor chip receives a tag reading instruction, a 9 th pin and a 10 th pin of the radio frequency processor chip U7 output radio frequency signals, the radio frequency signals are sent to the power amplifier chip U13 in the power amplifier circuit after passing through the matching circuit, meanwhile, a 24 th pin of the radio frequency processor chip U7 is connected with a resistor R107 in the power supply circuit, the high-low level of the 24 th pin of the radio frequency processor chip U7 is changed to control the on-off of a collector and an emitter of a triode Q1 in the power supply circuit, and therefore the power-on and the power-off of the power amplifier chip are achieved; the 28 th pin and the 29 th pin of the radio frequency processor chip U7 are respectively connected with the 12 th pin and the 13 th pin of the power amplifier chip U7 after being connected with resistors R41 and R40 in series, wherein the main function is that the output level of the 28 th pin and the 29 th pin of the radio frequency processor chip U7 is high and low to control the power amplification factor of the radio frequency signal of the power amplifier chip.
Referring to fig. 3, the power supply circuit of the present invention includes a power supply filter circuit and a power amplifier power control circuit.
The power supply filter circuit comprises a capacitor C31, a capacitor C32, a capacitor C20 and a resistor R106. The capacitor C31, the capacitor C32 and the capacitor C20 are connected in parallel, one end of each capacitor is respectively connected with the power supply VCC _33 and the resistor R106, and the other end of each capacitor is grounded; in practical application, the other end of the power supply VCC _33 is connected with an external connector, and the model of the connector is 11-21-1201-12; the resistor R106 is respectively connected with the radio frequency processor chip U7 and the power amplifier power supply control circuit.
The power amplifier power supply control circuit comprises a resistor R107, a resistor R123, a resistor R2, a transistor Q1 and a transistor U14. Transistor U14 includes transistor pin 1, transistor pin 2, and transistor pin 3; the transistor Q1 comprises a first terminal of a transistor Q1, a second terminal of a transistor Q1 and a third terminal of a transistor Q1; the first end of the triode Q1 is grounded, and the second end of the triode Q1 is connected with the radio frequency processor chip U7 through a resistor R107; the third end of the triode Q1 is connected with the 1 st pin of the transistor through the resistor R123 and is connected with the resistor R106 through the resistor R2; the No. 2 pin of the transistor is connected with a resistor R106; the 3 rd pin of the transistor is connected with the power amplifier circuit.
In this embodiment, the power can filter the ripple in the power after the power supply passes through the power supply filter circuit to guarantee the stability of whole module power supply. The power supply is divided into two paths after passing through the resistor R106, one path is connected to the radio frequency processor circuit to supply power for the radio frequency processor chip U7, and the other path is connected with the source of the No. 2 pin of the transistor of the power supply control circuit of the power amplifier. The drain electrode of the 3 rd pin of the transistor in the power supply control circuit of the power amplifier is connected with the power amplifier circuit, and the base electrode series resistor R107 of the triode is connected with the radio frequency processor circuit.
In this embodiment, the base of the transistor Q1 is connected in series with the resistor R107 and then connected with the rf processor chip U7, the emitter of the transistor Q1 is directly grounded, and the collector of the transistor Q1 is connected in series with the resistor R123 and then connected with the gate of the transistor U14. The resistor R2 is connected in series between the gate of the pin 1 and the source of the pin 2 of the transistor U14, and the resistor R2 and the source of the pin 2 of the transistor U14 are connected in parallel and then connected to the power supply VCC _ RF. When the ultrahigh frequency module starts to read the label, the 24 th pin of the radio frequency processor chip U7 outputs high level, the base of the triode Q1 in the power supply control circuit of the power amplifier is set high after voltage division by the resistor R107 in the power supply control circuit of the power amplifier, the collector and the emitter of the triode Q1 are conducted and grounded, the grid of the 1 st pin of the transistor is pulled low, so that the source of the 2 nd pin of the transistor and the grid of the 1 st pin of the transistor generate voltage difference, the larger the voltage difference is, the more thoroughly the source and the drain of the transistor are conducted, the stronger the overcurrent capability of the transistor is, and the source of the 2 nd pin of the transistor and the drain of the 3 rd pin of. The power supply VCC _ RF is output through the drain electrode of the 3 rd pin of the transistor, the output voltage VCC _ PA is connected to the power amplifier circuit, and the power amplifier chip can work normally after being successfully electrified; when the ultrahigh frequency module stops reading the label, the 24 th pin of the radio frequency processor chip U7 outputs a low level, the base level of a triode Q1 in the power supply control circuit of the power amplifier is set to be low, the collector and the emitter of the triode Q1 are disconnected, the 1 st pin grid of the transistor U14 recovers a high level, no voltage difference exists between the grid and the source, so that the 2 nd pin source of the transistor is disconnected with the 3 rd pin drain of the transistor, the power supply VCC _ RF supplies power to the power amplifier chip U13 and cuts off, and the power amplifier chip U13 stops working.
In this embodiment, the transistor U14 has a model AO3401, and the transistor Q1 has a model MMBT 2222A.
Referring to fig. 4, the power amplifier circuit includes a power supply VCC _ PA, a power amplifier chip U13, a capacitor C25, a capacitor C41, a capacitor C26, a capacitor C42, an inductor L12, a resistor R34, an inductor L10, a capacitor C39, a capacitor C45, an inductor L11, a capacitor C46, a resistor R30, an inductor R31, and a capacitor C44.
In this embodiment, the power supply VCC _ PA is connected to the 3 rd pin of the transistor; the power amplifier chip U13 is respectively connected with the resistor 40 and the resistor 41; the power amplifier chip U13 is connected with the other end of the inductor L9; after the capacitor C25 and the capacitor C41 are connected in parallel, one end of each capacitor is grounded; the other end of the resistor is respectively connected with the power amplifier chip U13 and one end of the resistor R36; the other end of the resistor R36 is connected with the radio frequency processor chip U7; the capacitor C26 and the capacitor C42 are connected in parallel, and one end of each capacitor is grounded; the other end is divided into two paths, and one path is connected with a power amplifier chip U13 through an inductor L12; the other path is connected with a power supply VCC _ PA through a resistor R34; after the capacitor C44 is connected with the resistor R31 in parallel, one end of the capacitor C44 is grounded, and the other end of the capacitor C44 is connected with one end of the power amplifier chip U13 and one end of the resistor R30 respectively; the other end of the resistor R30 is connected with one end of a capacitor C46, a power supply VCC _ PA and one end of an inductor L11 respectively; the other end of the capacitor C46 is grounded; the other end of the inductor L11 is connected with one end of the power amplifier chip U13 and one end of the inductor L10 respectively; the other end of the inductor L10 is connected with one end of a capacitor C39 and one end of a capacitor C45 respectively; the other end of the capacitor C39 is grounded; the other end of the capacitor C45 is connected to the antenna element.
In this embodiment, the antenna unit refers to a transceiver of radio frequency signals, and includes 1 ceramic antenna, 1 directional coupler (CP0603a0902CN), and 1 50 Ω resistor; the other end of the capacitor C45 is connected with the directional coupler.
In the embodiment, two paths of the power supply VCC _ PA are connected with the power supply control circuit of the power amplifier, and one path of the power supply VCC _ PA is connected with the resistor R34 in series, filtered by the capacitor C26 and the capacitor C42, and then connected with the inductor L12 in series to be connected to the 14 th pin of the power amplifier chip; the other power supply VCC _ PA is filtered by a capacitor C46 and then divided into two paths: one path of series inductor L11 is connected with the 9 th pin and the 10 th pin of the power amplifier chip U13, the other path of series inductor L11 is connected with the 6 th pin of the power amplifier chip U13 after being divided by the resistor R30 and the resistor R31, and the capacitor C44 is a filter device and is connected with the resistor R31 in parallel. The capacitor C41 and the capacitor C25 are connected in parallel and then connected with the power amplifier chip U13, and the other end of the capacitor C41 is grounded. The 9 th pin and the 10 th pin of the power amplifier chip U13 are connected in series with an inductor L10 and a capacitor C45, one end of the capacitor C39 is connected in parallel with the capacitor C45, and the other end of the capacitor C39 is grounded. And a 12 th pin and a 13 th pin of the power amplifier chip are respectively connected into the radio frequency processor circuit. During the work of the ultrahigh frequency module, the radio frequency processor chip controls the power supply circuit to supply power to the power amplifier circuit, and simultaneously controls the output power gain of the power amplifier through part of IO ports to achieve the purpose of controlling the power amplification of radio frequency signals.
The specific technical principle of the embodiment is as follows: in the case where the UHF module is not reading a tag, the power amplifier circuit is in a non-power state. When the ultrahigh frequency module starts to read the tag, the radio frequency processing chip U7 receives a tag reading instruction, and then the radio frequency processing chip U7 starts to work. The rf processor chip U7 will set the 27 th pin and the 28 th pin high, which are connected to the 12 th pin and the 13 th pin of the power amplifier chip respectively and control the output power gain of the power amplifier; the radio frequency processing chip U7 outputs radio frequency signals to the power amplifier chip U13, meanwhile, the radio frequency processor chip U7 sets the level of an IO port connected with a power supply control circuit of the power amplifier high, a collector and an emitter of a triode Q1 (a base (B), a collector (C) and an emitter (E) of the triode) of the power supply circuit are conducted and grounded, the grid level of a transistor U14 connected with the collector of the triode Q1 is pulled low, a source and a drain of a transistor U14 are conducted, and the power supply circuit supplies power to the power amplifier circuit; the power amplifier chip starts to work after being successfully electrified, receives a radio frequency signal output by the radio frequency processor circuit, amplifies the signal by the power amplifier chip, and ensures the maximum efficiency output of the radio frequency signal power by the matching circuit; when the radio frequency processor chip U7 receives the instruction of stopping reading the label, the radio frequency processor chip U7 stops outputting the radio frequency signal, and simultaneously the radio frequency processor chip U7 sets the level of the IO port connected with the power supply circuit low, the collector and the emitter of the triode Q1 of the power supply circuit are disconnected, the grid of the transistor U14 recovers the high level, the source and the drain of the transistor U14 are disconnected, and the power amplifier chip is powered off and stops working. The method effectively controls the working state of the power amplifier chip and achieves the purpose of reducing power consumption.
Claims (10)
1. The utility model provides a be applied to power amplifier's in hyperfrequency read write line power supply control circuit which characterized in that: the power supply control circuit applied to the power amplifier in the ultrahigh frequency reader-writer comprises a power supply circuit, a radio frequency processor circuit and a power amplifier circuit; the power supply circuit is respectively connected with the radio frequency processor circuit and the power amplifier circuit; the radio frequency processor circuit is connected with the power amplifier circuit.
2. The power supply control circuit applied to the power amplifier of the UHF reader-writer according to claim 1, characterized in that: the radio frequency processor circuit comprises a radio frequency processor chip U7, a clock source circuit, a radio frequency matching circuit and a power supply filter circuit; the radio frequency processor chip U7 is respectively connected with the clock source circuit, the radio frequency matching circuit and the power supply filter circuit; the radio frequency processor chip U7 is respectively connected with the power supply circuit and the power amplifier circuit.
3. The power supply control circuit applied to the power amplifier of the UHF reader-writer according to claim 2, characterized in that: the clock source circuit comprises a crystal oscillator Y1, a capacitor C23 and a capacitor C24;
the crystal oscillator Y1 comprises a pin 1, a pin 2, a pin 3 and a pin 4; and one end of the capacitor C24 are both grounded;
one end of the capacitor C23 is grounded; the other end of the capacitor C23 is connected with a pin 1 in parallel and then is connected with a radio frequency processor chip U7; one end of the capacitor C24 is connected with the 4 pins in parallel and then grounded; the other end of the capacitor C24 is connected with a pin 3 in parallel and then is connected with a radio frequency processor chip U7.
4. The power supply control circuit applied to the power amplifier of the UHF reader-writer according to claim 2, characterized in that: the power supply filtering circuit comprises a resistor 40, a resistor 41, a capacitor C124, a capacitor C125, a capacitor C126, a capacitor C127, a capacitor C128 and a capacitor C129;
one end of the capacitor C124 and one end of the capacitor C125 are both grounded and are connected with the radio frequency processor chip U7; the other end of the capacitor C124 and the other end of the capacitor C125 are both connected with a radio frequency processor chip U7;
the capacitor C126 is connected with the capacitor C127 in parallel, and one end of the capacitor C126 and one end of the capacitor C127 are both grounded; the other end of the capacitor C126 and the other end of the capacitor C127 are both connected with a radio frequency processor chip U7;
one end of the capacitor C128 is grounded, and the other end of the capacitor C128 is connected with the radio frequency processor chip U7;
one end of the capacitor C129 is grounded, and the other end of the capacitor C129 is connected with the radio frequency processor chip U7;
one end of the resistor 40 and one end of the resistor 41 are both connected with the radio frequency processor chip U7, and the other ends of the resistor 40 and the resistor 41 are respectively connected with the power amplifier circuit.
5. The power supply control circuit applied to the power amplifier of the UHF reader-writer according to claim 2, characterized in that: the radio frequency matching circuit comprises an inductor L3, an inductor L4, an inductor L9 and a capacitor C47;
the inductor L4 is connected with the inductor L9 in parallel; one end of the inductor L9 and one end of the inductor L4 are both grounded; the other end of the inductor L4 is connected with one end of an inductor L3 and one end of a capacitor C47 respectively; the other end of the inductor L3 is connected with a radio frequency processing chip U7; the other end of the inductor L9 is connected with the other end of the capacitor C47 and the power amplifier circuit respectively.
6. The power supply control circuit applied to the power amplifier in the ultrahigh frequency reader-writer according to claim 1 or 2, characterized in that: the power supply circuit comprises a power supply filter circuit and a power amplifier power supply control circuit which are connected with each other; the power supply filter circuit and the power amplifier power supply control circuit are both connected with a radio frequency processor chip U7; the power amplifier power supply control circuit is connected with the power amplifier circuit.
7. The power supply control circuit applied to the power amplifier of the UHF reader-writer according to claim 6, characterized in that: the power supply filter circuit comprises a power supply VCC-33, a resistor R106, a capacitor C31, a capacitor C32 and a capacitor C20;
the capacitor C31, the capacitor C32 and the capacitor C20 are connected in parallel, one end of each capacitor is respectively connected with the power supply VCC _33 and the resistor R106, and the other end of each capacitor is grounded; the resistor R106 is respectively connected with the radio frequency processor chip U7 and the power amplifier power supply control circuit.
8. The power supply control circuit applied to the power amplifier of the UHF reader-writer according to claim 6, characterized in that: the power amplifier power supply control circuit comprises a resistor R107, a resistor R123, a resistor R2, a triode Q1 and a transistor U14;
the transistor U14 comprises a transistor No. 1 pin, a transistor No. 2 pin and a transistor No. 3 pin; the transistor Q1 comprises a first terminal of a transistor Q1, a second terminal of a transistor Q1 and a third terminal of a transistor Q1;
the first end of the triode Q1 is grounded, and the second end of the triode Q1 is connected with the radio frequency processor chip U7 through a resistor R107; the third end of the triode Q1 is connected with the 1 st pin of the transistor through a resistor R123 and is connected with a resistor R106 through a resistor R2;
the No. 2 pin of the transistor is connected with a resistor R106; and the 3 rd pin of the transistor is connected with the power amplifier circuit.
9. The power supply control circuit of claim 8, wherein the power amplifier comprises: the power amplifier circuit comprises a power supply VCC _ PA, a power amplifier chip U13, a capacitor C25, a capacitor C41, a capacitor C26, a capacitor C42, an inductor L12, a resistor R34, an inductor L10, a capacitor C39, a capacitor C45, an inductor L11, a capacitor C46, a resistor R30, an inductor R31 and a capacitor C44;
the power supply VCC _ PA is connected with the 3 rd pin of the transistor; the power amplifier chip U13 is respectively connected with the resistor 40 and the resistor 41; the power amplifier chip U13 is connected with the other end of the inductor L9;
after the capacitor C25 and the capacitor C41 are connected in parallel, one end of each capacitor is grounded; the other end of the resistor is respectively connected with the power amplifier chip U13 and one end of the resistor R36; the other end of the resistor R36 is connected with a radio frequency processor chip U7;
the capacitor C26 and the capacitor C42 are connected in parallel, and one end of each capacitor is grounded; the other end is divided into two paths, and one path is connected with a power amplifier chip U13 through an inductor L12; the other path is connected with a power supply VCC _ PA through a resistor R34;
after the capacitor C44 is connected with the resistor R31 in parallel, one end of the capacitor C44 is grounded, and the other end of the capacitor C44 is connected with one end of the power amplifier chip U13 and one end of the resistor R30 respectively; the other end of the resistor R30 is connected with one end of a capacitor C46, a power supply VCC _ PA and one end of an inductor L11 respectively; the other end of the capacitor C46 is grounded; the other end of the inductor L11 is connected with one end of a power amplifier chip U13 and one end of an inductor L10 respectively; the other end of the inductor L10 is connected with one end of a capacitor C39 and one end of a capacitor C45 respectively; the other end of the capacitor C39 is grounded.
10. The power supply control circuit applied to the power amplifier of the uhf reader/writer according to claim 9, wherein: the model of the power amplifier chip U13 is RFPA 0133; the model number of the radio frequency processor chip U7 is M100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020557672.3U CN211742134U (en) | 2020-04-15 | 2020-04-15 | Power supply control circuit applied to power amplifier in ultrahigh frequency reader-writer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020557672.3U CN211742134U (en) | 2020-04-15 | 2020-04-15 | Power supply control circuit applied to power amplifier in ultrahigh frequency reader-writer |
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| Publication Number | Publication Date |
|---|---|
| CN211742134U true CN211742134U (en) | 2020-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020557672.3U Active CN211742134U (en) | 2020-04-15 | 2020-04-15 | Power supply control circuit applied to power amplifier in ultrahigh frequency reader-writer |
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| Country | Link |
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| CN (1) | CN211742134U (en) |
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