CN106253205B - A kind of radio-frequency feed protection circuit - Google Patents
A kind of radio-frequency feed protection circuit Download PDFInfo
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- CN106253205B CN106253205B CN201610807690.0A CN201610807690A CN106253205B CN 106253205 B CN106253205 B CN 106253205B CN 201610807690 A CN201610807690 A CN 201610807690A CN 106253205 B CN106253205 B CN 106253205B
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- switching circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
Abstract
The invention discloses a kind of radio-frequency feeds to protect circuit, is related to radio circuit field, comprising: switching circuit, first switch control circuit, second switch control circuit；The second end of switching circuit is connected with voltage input end, and third end is connected with voltage output end and radio circuit, and switching circuit controls voltage input end to radio circuit output voltage；The first end of first switch control circuit is connected with voltage output end, and the second end of first switch control circuit is connected with the first end of switching circuit, first switch control circuit control switch circuit, thus closure switch circuit；Second switch control circuit is connect with the first end of switching circuit, and second switch control circuit is used for when radio circuit works normally, and switching circuit is opened in control.Using first switch control circuit when short circuit occurs for radio circuit, control switch circuit is closed state, will not be damaged to the device of connection radio circuit output end.
Description
Technical field
The present invention relates to radio circuit fields more particularly to a kind of radio-frequency feed to protect circuit.
Background technique
Radio frequency (RF, Radio Frequency) refers exclusively to the electromagnetic wave that there is certain wavelength can be used for radio communication.Radio frequency
Transmit circuit is generally made of bandpass filter, transmitting mixer, power amplifier, power control, duplexer etc., it will
The analog baseband signal of 66.768KHz up-converts to the transmitting signal of 890-915MHz, and carries out power amplification, makes signal from day
Line is launched.The many occasions of radio-frequency feed are all applied, and especially active antenna feed is widely used in a communications device
It is general.
Generally in radio-frequency feed circuit, it will usually utilize switch element, such as metal-oxide-semiconductor to control the switch of radio circuit
State.Under normal conditions, if positive and negative anodes short circuit, overcurrent occurs in radio-frequency feed power output end, shutdown switchs original part not in time
It will appear overheat and burn out device and transmission line situation, will cause property loss or even jeopardize personal safety.
In the prior art, in radio-frequency feed short-circuit protection technical aspect, integrated chip current-limiting protection is mostly used greatly, but it is sharp
When carrying out current-limiting protection with integrated chip, the loss of higher cost, feed circuit is larger, and peripheral circuit signal is caused to transmit
Matching is bad.
Summary of the invention
The present invention provides a kind of radio-frequency feed protection circuit, carries out current limliting using integrated chip in the prior art for solving
When protection, the loss of higher cost, feed circuit is larger, and the problem for causing peripheral circuit signal transmission matching bad.
The embodiment of the present invention provides a kind of radio-frequency feed protection circuit, comprising:
Switching circuit, first switch control circuit, second switch control circuit；
The second end of the switching circuit is connected with voltage input end, third end and voltage output end and radio circuit phase
Even, it is closure or openness shape that the switching circuit, which controls the switching circuit according to the voltage of the switching circuit first end,
State, to control voltage input end to radio circuit output voltage；
The first end of the first switch control circuit is connected with the voltage output end, the first switch control circuit
Second end be connected with the first end of the switching circuit, the first switch control circuit be used for according to the radio frequency electrical it is short out
The output voltage of voltage output end when road, the voltage for controlling the switching circuit first end are to be closed the switching circuit
Voltage, thus closure switch circuit；
The second switch control circuit, connect with the first end of the switching circuit, the second switch control circuit
For when the radio circuit works normally, the voltage for controlling the switching circuit first end to be to open the switching circuit
Voltage, to open switching circuit.
Further, the first switch control circuit include the first triode, the first end of first triode with
The voltage output end connection, the second end of first triode are connected with the voltage input end, first triode
Third end be connected with the first end of the switching circuit.
Further, the first switch control circuit further includes being sequentially connected in series from the voltage input end to ground terminal
First capacitor, first resistor and second resistance, the first end of first triode be located at the first capacitor and described the
First node connection between one resistance, the voltage output end and between the first resistor and the second resistance
Second node connection, to be connect by the first resistor with the first end of first triode.Further, described
One triode is p-type triode PNP, and the first end of first triode is the base stage of the PNP, first triode
Second end is the emitter of the PNP, and the third end of first triode is the collector of the PNP.Further, described
Switching circuit includes switching transistor, and the switching transistor is P type metal oxide semiconductor PMOS tube, the switching circuit
First end be the PMOS tube grid, the second end of the switching circuit is the source electrode of the PMOS tube, and the switch is electric
The third end on road is the drain electrode of the PMOS tube.Further, the switching circuit further includes positioned at the of the switching circuit
3rd resistor in parallel and the second capacitor between one end and the second end of the switching circuit, second capacitor are used for described
It discharges when voltage input end power down, the first end and second end for the switching circuit provides voltage, to the switch electricity
Road carries out buffer protection.
Further, the circuit further include:
Voltage input end is controlled, is connect with the second switch control circuit, is used for the second switch control circuit
Input control voltage, so that the second switch control circuit is able to maintain open state, and in the normal work of the radio circuit
When making, the voltage of the switching circuit first end is controlled, so that the switching circuit is open state.
Further, the second switch control circuit includes: the second triode, the first end of second triode with
The first end of the switching circuit connects, and the second end of second triode is connect with the control voltage input end, described
The third end of second triode is grounded.
Further, the second switch control circuit further include: be located at the control voltage input end and described second
The 4th resistance between the second end of triode, the 5th electricity between the control voltage input end and another ground terminal
Resistance, the 6th resistance between the second triode first end and the first end of the switching circuit.Further, described
Second triode is N-type triode NPN, and the base stage of the NPN is the second end of second triode, the current collection of the NPN
The first end of extremely described second triode, the third end of extremely described second triode of transmitting of the NPN.
Further, the circuit further include:
Third capacitor, between the input terminal and rf access point of the radio circuit, wherein the rf access point
For the point that the switching circuit is connected with radio circuit, the input of the radio circuit is fed back to for obstructing DC voltage
End.
Further, the circuit further include:
Radio frequency bypass circuit, between the voltage output end and the radio circuit, for obstructing in radio circuit
High-frequency signal be output in the switching circuit.
It in the embodiment of the present invention, is controlled whether using switching circuit to radio circuit output voltage, and utilizes first switch
For control circuit when short circuit occurs for radio circuit, control switch circuit is closed state, so that switching circuit is no longer to radio frequency electrical
Road output voltage guarantees radio circuit when short circuit occurs, will not damage to the device of connection radio circuit output end；?
In the embodiment of the present invention, it can effectively ensure that using second switch control circuit when radio circuit works normally, guarantee out
The state on powered-down road is open state, i.e., to radio circuit output voltage.In the embodiment of the present invention, presented using switching circuit
Electric circuit protection, circuit cost is low, and structure is simple, and the matching of circuit is strong.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without any creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is the structural schematic diagram that a kind of radio-frequency feed provided in an embodiment of the present invention protects circuit；
Fig. 2 is the structural schematic diagram of first switch control circuit provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of first switch control circuit provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of switching circuit provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of control voltage input end provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of second switch control circuit provided in an embodiment of the present invention；
Fig. 7 is the structural schematic diagram of second switch control circuit provided in an embodiment of the present invention；
Fig. 8 is the structural schematic diagram of radio frequency bypass circuit provided in an embodiment of the present invention；
Fig. 9 is the structural schematic diagram of radio frequency bypass circuit provided in an embodiment of the present invention；
Figure 10 is the structural schematic diagram of third capacitor provided in an embodiment of the present invention；
Figure 11 is the structural schematic diagram that a kind of radio-frequency feed provided in an embodiment of the present invention protects circuit.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that the described embodiments are only some of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
The present invention provides a kind of radio-frequency feed protection circuit, as shown in Figure 1, comprising:
Switching circuit 100, first switch control circuit 110, second switch control circuit 120；
The second end 1002 of the switching circuit 100 is connected with voltage input end 130, the third of the switching circuit 100
End 1003 is connected with voltage output end 140 and radio circuit 180, and the switching circuit 100 is according to the switching circuit 100
The voltage of first end 1001 controls the state of the switching circuit 100, thus to 180 output voltage of radio circuit；
The first end 1101 of the first switch control circuit 110 is connected with the voltage output end 130, and described first opens
The second end 1102 for closing control circuit 110 is connected with the first end 1001 of the switching circuit 100, the first switch control electricity
The output voltage of the voltage output end 140 when being used for according to 180 short circuit of radio circuit of road 110, the switching circuit 100
The voltage of first end 1001 be the voltage for being closed the switching circuit 100, thus closure switch circuit 100；
The second switch control circuit 120 is connect with the first end 1001 of the switching circuit 100, and described second opens
Control circuit 120 is closed to be used to control the first end 1001 of the switching circuit 100 when the radio circuit 180 works normally
Voltage be the voltage for opening the switching circuit 100, to open switching circuit 100.In embodiments of the present invention, voltage
The voltage of input terminal 130 can be 28V, or be 12V.The voltage input end 130 is by voltage by switching circuit 100 to penetrating
180 output voltage of frequency circuit, so that the RF Components for being connected to radio circuit output end 1801 work normally.
In embodiments of the present invention, there are two types of the states of switching circuit 100, one kind is closed state, i.e. switching circuit 100
No longer to 180 output voltage of radio circuit；One kind is open state, i.e. switching circuit 100 to 180 output voltage of radio circuit.
In embodiments of the present invention, when radio circuit 180 is to work normally, needing switching circuit 100 is open state,
Switching circuit 100 is to 180 output voltage of radio circuit, so that radio circuit 180 works normally.
In embodiments of the present invention, the open state of switching circuit 100 and closed state are by the first of switching circuit 100
1001 are held to control, in embodiments of the present invention, when radio circuit 180 works normally, the first end 1001 of switching circuit 100
Voltage be to be controlled by second control circuit 120, keep switching circuit 100 in the open state；When radio circuit 180 occur it is short
Lu Shi, the voltage of the first end 1001 of switching circuit 100 are controlled by first switch control circuit 110, and switch electricity is made
Road 100 is in closed state.
In embodiments of the present invention, voltage output end 140 is connect with the second end 1102 of first switch control circuit 110,
When short circuit occurs for radio circuit 180, the voltage in radio circuit 180 mutates, i.e., is dashed forward by the voltage of voltage input end 130
It becomes zero, the voltage of voltage output end 140 is equal with the voltage in radio circuit 180 at this time, that is, becomes zero, at this time first switch
Control circuit 110 is when the voltage for determining voltage output end 140 becomes zero, it is determined that short circuit occurs for radio circuit 180, then passes through
The voltage of the first port 1001 of the 1102 control switch circuit 100 of second port of first switch control circuit 110, so that switch
Circuit 100 becomes closed state, the RF component that protection radio circuit output end 1801 connects from open state.
In embodiments of the present invention, as shown in Fig. 2, first switch control circuit 110 include the first triode 1103, first
The first end 110301 of triode 1103 is connect with voltage output end 140, the second end 110302 and electricity of the first triode 1103
Input terminal 130 is pressed to connect, the third end 110303 of the first triode is connected with the first end 1001 of switching circuit 100.
Optionally, in embodiments of the present invention, as shown in Fig. 2, in order to preferably represent first switch control circuit 110
With the connection relationship of voltage output end 140, one is additionally provided near the first triode 1103 of first switch control circuit 110
Voltage output end 140 is connected with conducting wire between two voltage output ends 140 in circuit.
Optionally, in embodiments of the present invention, the first triode 1103 is p-type triode PNP, the first triode 1103
First end 110301 is the base stage of PNP, and the second end 110302 of the first triode 1103 is the emitter of PNP, the first triode
1103 third end 110303 is the collector of PNP.
In embodiments of the present invention, as shown in figure 3, first switch control circuit 110 further include from voltage input end 130 to
First capacitor 1104, first resistor 1105 and the second resistance 1106 that ground terminal is sequentially connected in series, first triode 1103
First end 110301 and the first node 11001 between first capacitor 1104 and first resistor 1105 connect, voltage output
End 140 and the second node 11002 between first resistor 1105 and second resistance 1106 connect, to pass through first resistor
1105 connect with the first end 110301 of the first triode 1103.
In embodiments of the present invention, second resistance 1106 prevents voltage output end to be directly grounded, optionally, second resistance
Resistance value is the Europe 10K, and the effect of first resistor 1105 is the resistance value by adjusting first resistor 1105, guarantees voltage output end
140 voltage value is equal with the voltage value of radio circuit 180, optionally, in embodiments of the present invention, the electricity of first resistor 1105
Resistance value is the Europe 100K.
In embodiments of the present invention, the effect of first capacitor 1104 is to keep voltage defeated when radio circuit 180 works normally
Enter the first ends 110301 that end 130 does not act on the first triode 1103, on the other hand, when voltage input end 130 breaks down,
That is when the input voltage of voltage input end 130 suddenly becomes zero, first capacitor 1104 can pass through the voltage made in circuit that discharges
It slowly reduces to zero, protects the component in circuit.
Optionally, in embodiments of the present invention, the capacitance of first capacitor 1104 be 1 μ F, first capacitor 1104 it is resistance to
Pressure is 50V.
In embodiments of the present invention, when radio circuit 180 works normally, due to the effect of first capacitor 1104, PNP pipe
The voltage of 1103 emitter 110302 is the voltage of voltage input end 130, and the voltage of the base stage 110301 of PNP pipe 1103 is electricity
Press output end 140 voltage, due to radio circuit 180 work normally when, the voltage and voltage output end of voltage input end 130
140 voltage is equal, so PNP pipe 1103 is not turned on.
When short circuit occurs for radio circuit 180, the voltage of voltage output end 140 is become zero, the base stage of PNP pipe 1103
Form voltage difference between 110301 and the emitter 110302 of PNP pipe 1103, and the emitter 110302 of PNP pipe 1103 with
The voltage difference of the base stage 110301 of PNP pipe 1103 is greater than conducting potential difference, so PNP pipe 1103 can be connected, due to PNP pipe
After 1103 are connected, the collector 110303 of PNP pipe 1103 is connect with the first end 1001 of switching circuit 100, so can
The voltage for changing the first end 1001 of switching circuit 100, to turn off the switch circuit 100.
In embodiments of the present invention, as shown in figure 4, switching circuit 100 includes switching transistor 101, the switch crystal
Pipe 101 is P type metal oxide semiconductor PMOS tube 101, and the first end 1001 of the switching circuit 100 is the PMOS tube
101 grid, the second end 1002 of the switching circuit 100 are the source electrode of the PMOS tube 101, the switching circuit 100
Third end 1003 is the drain electrode of the PMOS tube 101.
In embodiments of the present invention, the condition of the conducting of PMOS tube 101 is that the voltage of the grid 1001 of PMOS tube 101 is lower than
The source electrode 1002 of PMOS tube 101, and the source electrode 1002 of PMOS tube 101 is big with the potential difference of the grid 1001 of PMOS tube 101
In conducting potential difference.In embodiments of the present invention, when radio circuit 180 works normally, the electricity of the grid 1001 of PMOS tube 101
Pressure provides voltage by second switch control circuit 120, and the voltage of the source electrode 1002 of PMOS tube 101 is the electricity of voltage input end 130
Pressure, when the voltage of voltage input end 130 is higher than the voltage of second switch control circuit 120, and voltage input end 130 and second
When the voltage difference of ON-OFF control circuit 120 is greater than conducting potential difference, PMOS tube conducting, so that it may export electricity to radio circuit 180
Pressure.
When short circuit occurs for radio circuit 180, as shown in Figure 3, Figure 4, the one or three pole in first switch control circuit 110
After switch, the grid voltage of PMOS tube 101 changes pipe 1103, and the voltage of the grid 1001 of PMOS tube 101 is that voltage is defeated
Entering the voltage at end 130, the voltage of the source electrode 1002 of PMOS tube 101 is the voltage of voltage input end 130, so PMOS tube is closed,
No longer to 180 output voltage of radio circuit.
In embodiments of the present invention, switching circuit 100 further includes the first end 1001 and switch electricity positioned at switching circuit 100
3rd resistor 102 in parallel and the second capacitor 103 between the second end 1002 on road 100, the second capacitor 103 are used in voltage input
It discharges when holding 130 power down, voltage is provided for the first end 1001 and second end 1002 of switching circuit 100, to switching circuit
100 carry out buffer protection.
In embodiments of the present invention, the effect of 3rd resistor 102 is when radio circuit 180 works normally, and reduction passes through
The electric current of 3rd resistor 102, so that the voltage of the second end 1002 of switching circuit 100 is equal with the voltage of voltage input end 130,
Optionally, in embodiments of the present invention, the resistance value of 3rd resistor 102 is the Europe 100K.
In embodiments of the present invention, the effect of the second capacitor 103 is in 130 power down of voltage input end, when absorbing power down
The spike of formation reduces the impact to the switching transistor 101 of switching circuit 100, protects transistor 101.
In embodiments of the present invention, as shown in figure 5, the circuit further include: control voltage input end 150 is opened with second
It closes control circuit 120 to connect, be used for 120 input control voltage of second switch control circuit, so that second switch control circuit
120 are able to maintain open state, and when radio circuit 180 works normally, the electricity of 100 first end 1001 of control switch circuit
Pressure, so that the switching circuit 100 is open state.
In embodiments of the present invention, the voltage for controlling voltage input end 150 can be 3.3V and hereinafter, so as to be connected to
Second switch control circuit 120 can be connected for low-voltage in CPU.
In embodiments of the present invention, as shown in fig. 6, second switch control circuit 120 includes: the second triode 1201, the
The first end 120101 of two triodes 1201 is connect with the first end 1001 of switching circuit 100, and the second of the second triode 1201
End 120102 is connect with control voltage input end 150, and the third end 120103 of second triode 1201 is grounded.
In embodiments of the present invention, the second triode 1201 is used to pass through conducting the when radio circuit 180 works normally
Two triodes 1201, and then switching circuit 100 is connected, so that switching circuit 100 transmits voltage to radio circuit 100.
In embodiments of the present invention, optionally, the second triode 1201 is the base of N-type triode NPN1201, NPN1201
The second end 120102 of extremely described second triode 1201, the first end of the current collection of NPN1201 extremely the second triode 1201
The third end 120103 of 120101, NPN1201 transmitting extremely the second triode 1201.In embodiments of the present invention, NPN1201
The condition of conducting is emitter 120103 of the voltage higher than NPN1201 of the base stage 120102 of NPN1201, because NPN1201
Emitter 120103 is grounded, as long as so the voltage of the base stage 120101 of NPN1201 is higher than the conducting potential difference of NPN1201
To realize the conducting of NPN1201.
In embodiments of the present invention, as shown in fig. 7, second switch control circuit 120 further include: be located at control voltage input
The 4th resistance 1202 between end 150 and the second end 120102 of second triode 1201 is located at control voltage input end
The 5th resistance between 150 another ground terminal different from the ground terminal at third end 120103 of the second triode 1201
1203, the 6th electricity between 1201 first end 120101 of first end 1001 and second triode of switching circuit 100
Resistance 1204.
In embodiments of the present invention, the effect of the 5th resistance 1203 is formed into a loop with control voltage input end 150, the 4th
Resistance 1202 is a biasing resistor, when the second triode 1201 works normally, it is necessary to assure the hair of the second triode 1201
It is reverse-biased to penetrate knot positively biased, collector junction.Bias current can be provided for the second triode 1201 using the 4th resistance 1202, make the two or three
Pole pipe 1201 is connected.
In the embodiment of the present invention, the effect of the 6th resistance 1204 between switching circuit 100 and the second triode 1201
It is pull down resistor, guarantees that the first end 1001 of switching circuit 100 can obtain potential difference, guarantee the conducting of switching circuit 100.
Optionally, in embodiments of the present invention, the resistance value of the 4th resistance 1202 is the Europe 1K, and the resistance value of the 5th resistance 1203 is
The Europe 1K, the resistance value of the 6th resistance 1204 are the Europe 2K.
In embodiments of the present invention, as shown in figure 8, the circuit further include: further include third capacitor 170, be located at described
Between the input terminal 1802 and rf access point 190 of radio circuit 180, wherein rf access point 190 be switching circuit 100 with penetrate
The point that frequency circuit 180 is connected, optionally, in embodiments of the present invention, the third end 1003 of switching circuit 100 and radio circuit
180 access point be 190, third capacitor 170 be used for obstruct DC voltage feed back to the radio circuit 180 radio circuit it is defeated
Enter end 1802.
Optionally, in embodiments of the present invention, the capacitance of third capacitor 170 is 1 μ F, and the pressure resistance of third capacitor is
100V。
In embodiments of the present invention, as shown in figure 9, the circuit further includes radio frequency bypass circuit 160, it is located at voltage output
Between end 140 and radio circuit 180, for obstructing the high-frequency signal access switch circuit 100 of radio circuit 180.
In embodiments of the present invention, what the radio circuit input terminal 1802 of radio circuit 180 generated is high-frequency signal, and is opened
It is that the signal generated using voltage input end 130 provides voltage to radio circuit 180 in powered-down road 100, due to voltage input
The DC voltage of 130 input of end, so the generation of voltage input end 130 is low frequency signal, so needing radio frequency bypass circuit 160
It obstructs in the high-frequency signal access switch circuit 100 in radio circuit 180, guarantees the normal operation of switching circuit 100.
Optionally, in embodiments of the present invention, as shown in Figure 10, radio frequency bypass circuit 160 further include inductance 1601 and
4th capacitor 1602, the effect of inductance 1601 be obstruct radio circuit 180 in high-frequency signal access switch circuit 100, the 4th
The effect of capacitor 1602 is to reduce power supply output ripple, and absorb the switching frequency signal of switching circuit 100.
Optionally, in embodiments of the present invention, the model CL6130-AL of inductance 1601, the capacitor of the 4th capacitor 1602
Capacity is 0.01 μ F, and the pressure resistance of the 4th capacitor 1602 is 50V.
In the embodiment of the present invention, a kind of radio-frequency feed protection circuit is provided, as shown in figure 11, including voltage input end, electricity
Press output end, switching circuit, first switch control circuit, second switch control circuit, radio frequency bypass circuit, control voltage input
End and the 6th resistance, third capacitor composition.Wherein, first switch control circuit is by first capacitor, first resistor, second resistance
And PNP triode composition；Switching circuit is made of the second capacitor, 3rd resistor and PMOS tube；Radio frequency bypass circuit is by electricity
Sense and the 4th capacitor composition；Second switch control circuit is made of the 4th resistance, NPN triode and the 5th resistance.
For the base stage of PNP triode between first capacitor and first resistor, voltage output end is located at second resistance and the
Between one resistance, the emitter of PNP triode is connect with voltage input end, the collector of PNP triode and the grid of PMOS tube
Connection.
First capacitor one end is connect with voltage input end, the base stage connection of the other end and PNP triode, and the one of first resistor
End is connect with the base stage of PNP triode, and the other end is connect with voltage output end, and one end of second resistance and voltage output end connect
It connects, other end ground connection.
The grid of PMOS tube is also connected with the 6th resistance, and the source level of PMOS tube is connect with voltage input end, the leakage of PMOS tube
Pole is connect with voltage output end.Second capacitor and 3rd resistor are connected in parallel between the emitter and collector of PNP triode.
The base stage of NPN triode is connect with control voltage input end, is connected between the base stage and control voltage input end of NPN
4th circuit, the emitter ground connection of NPN triode, the collector of NPN triode and the grid of PMOS tube connect, and connect
6th resistance.One end of 5th resistance is connect with control voltage input end, and the other end is connected with another ground terminal, i.e., the 5th electricity
Resistance is located between the control voltage input end ground terminal different from the emitter of NPN.
It has also connected between radio circuit input terminal and the access point on radio frequency bypass circuit third capacitor.Radio circuit with
It has connected between voltage output end inductance, the 4th capacitor is connected between voltage output end and ground terminal.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (12)
1. a kind of radio-frequency feed protects circuit characterized by comprising switching circuit, first switch control circuit, second switch
Control circuit；
The second end of the switching circuit is connected with voltage input end, and third end is connected with voltage output end and radio circuit, institute
Stating switching circuit to control the switching circuit according to the voltage of the switching circuit first end is closure or openness state, thus
Voltage input end is controlled to radio circuit output voltage；
The first end of the first switch control circuit is connected with the voltage output end, and the of the first switch control circuit
Two ends are connected with the first end of the switching circuit, when the first switch control circuit is used for according to the radio circuit short circuit
The output voltage of the voltage output end, the voltage for controlling the switching circuit first end are the electricity for making the switching circuit closure
Pressure, thus closure switch circuit；
The second switch control circuit, connect with the first end of the switching circuit, and the second switch control circuit is used for
When the radio circuit works normally, the voltage for controlling the switching circuit first end is the electricity for opening the switching circuit
Pressure, to open switching circuit.
2. circuit according to claim 1, which is characterized in that the first switch control circuit includes the first triode,
The first end of first triode is connect with the voltage output end, and the second end of first triode and the voltage are defeated
Enter end to be connected, the third end of first triode is connected with the first end of the switching circuit.
3. circuit according to claim 2, which is characterized in that the first switch control circuit further includes from the voltage
First capacitor, first resistor and the second resistance that input terminal to ground terminal is sequentially connected in series, the first end of first triode with
Between the first capacitor and the first resistor first node connection, the voltage output end be located at described first
Second node connection between resistance and the second resistance, thus pass through the first resistor and first triode the
One end connection.
4. circuit according to claim 3, which is characterized in that first triode is p-type triode PNP, described the
The first end of one triode is the base stage of the PNP, and the second end of first triode is the emitter of the PNP, described
The third end of first triode is the collector of the PNP.
5. circuit according to claim 1, which is characterized in that the switching circuit includes switching transistor, the switch
Transistor is P type metal oxide semiconductor PMOS tube, and the first end of the switching circuit is the grid of the PMOS tube, described
The second end of switching circuit is the source electrode of the PMOS tube, and the third end of the switching circuit is the drain electrode of the PMOS tube.
6. circuit according to claim 5, which is characterized in that the switching circuit further includes being located at the switching circuit
3rd resistor in parallel and the second capacitor between first end and the second end of the switching circuit, second capacitor are used in institute
It discharges when stating voltage input end power down, the first end and second end for the switching circuit provides voltage, to the switch
Circuit carries out buffer protection.
7. circuit according to claim 1, which is characterized in that further include:
Voltage input end is controlled, is connect with the second switch control circuit, for being inputted to the second switch control circuit
Voltage is controlled, so that the second switch control circuit is able to maintain open state, and when the radio circuit works normally,
The voltage of the switching circuit first end is controlled, so that the switching circuit is open state.
8. circuit according to claim 7, which is characterized in that the second switch control circuit includes: the second triode,
The first end of second triode is connect with the first end of the switching circuit, the second end of second triode with it is described
Control voltage input end connection, the third end ground connection of second triode.
9. circuit according to claim 8, which is characterized in that the second switch control circuit further include: be located at described
Control the 4th resistance between voltage input end and the second end of second triode, be located at the control voltage input end and
The 5th resistance between another ground terminal, between the second triode first end and the first end of the switching circuit
6th resistance.
10. circuit according to claim 8, which is characterized in that second triode is N-type triode NPN, described
The base stage of NPN is the second end of second triode, the first end of extremely described second triode of the current collection of the NPN, institute
State the third end of extremely described second triode of transmitting of NPN.
11. circuit according to claim 1, which is characterized in that further include:
Third capacitor, between the input terminal and rf access point of the radio circuit, wherein the rf access point is institute
The point that switching circuit is connected with radio circuit is stated, the input terminal of the radio circuit is fed back to for obstructing DC voltage.
12. circuit according to claim 1, which is characterized in that further include:
Radio frequency bypass circuit, between the voltage output end and the radio circuit, for obstructing the height in radio circuit
Frequency signal is output in the switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610807690.0A CN106253205B (en) | 2016-09-07 | 2016-09-07 | A kind of radio-frequency feed protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610807690.0A CN106253205B (en) | 2016-09-07 | 2016-09-07 | A kind of radio-frequency feed protection circuit |
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| CN106253205A CN106253205A (en) | 2016-12-21 |
| CN106253205B true CN106253205B (en) | 2019-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610807690.0A Active CN106253205B (en) | 2016-09-07 | 2016-09-07 | A kind of radio-frequency feed protection circuit |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111293998B (en) * | 2020-05-11 | 2020-09-01 | 锐石创芯（深圳）科技有限公司 | Capacitor switching chip and radio frequency power amplifying circuit |
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|---|---|---|---|---|
| KR100631415B1 (en) * | 2005-05-31 | 2006-10-04 | 삼성전기주식회사 | Quad band front end module |
| CN101030785A (en) * | 2006-02-28 | 2007-09-05 | 启碁科技股份有限公司 | Wireless telecommunicating system for transmitting signal by single wire feeding |
| CN103595385A (en) * | 2013-11-25 | 2014-02-19 | 中国科学院微电子研究所 | Radio frequency switching circuit of III-V group MOSFET device |
| CN105406845A (en) * | 2015-12-01 | 2016-03-16 | 深圳市创维群欣安防科技有限公司 | P-channel metal oxide semiconductor (PMOS) switch-off control circuit and power supply device |
| CN206164073U (en) * | 2016-09-07 | 2017-05-10 | 京信通信技术(广州)有限公司 | Radio frequency feed protection circuit |
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2016
- 2016-09-07 CN CN201610807690.0A patent/CN106253205B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100631415B1 (en) * | 2005-05-31 | 2006-10-04 | 삼성전기주식회사 | Quad band front end module |
| CN101030785A (en) * | 2006-02-28 | 2007-09-05 | 启碁科技股份有限公司 | Wireless telecommunicating system for transmitting signal by single wire feeding |
| CN103595385A (en) * | 2013-11-25 | 2014-02-19 | 中国科学院微电子研究所 | Radio frequency switching circuit of III-V group MOSFET device |
| CN105406845A (en) * | 2015-12-01 | 2016-03-16 | 深圳市创维群欣安防科技有限公司 | P-channel metal oxide semiconductor (PMOS) switch-off control circuit and power supply device |
| CN206164073U (en) * | 2016-09-07 | 2017-05-10 | 京信通信技术(广州)有限公司 | Radio frequency feed protection circuit |
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| CN106253205A (en) | 2016-12-21 |
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Effective date of registration: 20180222 Address after: 510663 Shenzhou Road, Guangzhou Science City, Guangzhou, Guangzhou economic and Technological Development Zone, Guangdong Province, No. 10 Applicant after: Comba Telecom System (China) Co., Ltd. Applicant after: Comba Telecom Systems (Guangzhou) Co., Ltd. Applicant after: Jingxin Communication Technology (Guangzhou) Co., Ltd. Applicant after: TIANJIN COMBA TELECOM SYSTEMS CO., LTD. Address before: 510663 Guangdong city of Guangzhou Province Economic and Technological Development Zone Jinbi Road No. 6 Applicant before: Jingxin Communication Technology (Guangzhou) Co., Ltd. |
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Effective date of registration: 20200108 Address after: 510663 No. 10, Shenzhou Road, Science City, Guangzhou, economic and Technological Development Zone, Huangpu District, Guangzhou, Guangdong Province Patentee after: Jingxin Communication System (China) Co., Ltd. Address before: 510663 Shenzhou Road, Guangzhou Science City, Guangzhou, Guangzhou economic and Technological Development Zone, Guangdong Province, No. 10 Co-patentee before: Jingxin Communication System (Guangzhou) Co., Ltd. Patentee before: Jingxin Communication System (China) Co., Ltd. Co-patentee before: Jingxin Communication Technology (Guangzhou) Co., Ltd. Co-patentee before: TIANJIN COMBA TELECOM SYSTEMS CO., LTD. |
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Address after: 510663 No.10, Shenzhou Road, Guangzhou Science City, economic and Technological Development Zone, Huangpu District, Guangzhou City, Guangdong Province Patentee after: Jingxin Network System Co.,Ltd. Address before: 510663 No.10, Shenzhou Road, Guangzhou Science City, economic and Technological Development Zone, Huangpu District, Guangzhou City, Guangdong Province Patentee before: Comba Telecom System (China) Ltd. |
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