CN210297672U - Switch drive circuit and electronic switch - Google Patents
Switch drive circuit and electronic switch Download PDFInfo
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- CN210297672U CN210297672U CN201921448084.XU CN201921448084U CN210297672U CN 210297672 U CN210297672 U CN 210297672U CN 201921448084 U CN201921448084 U CN 201921448084U CN 210297672 U CN210297672 U CN 210297672U
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Abstract
The utility model discloses a switch drive circuit and electronic switch, switch drive circuit includes: two control circuits to receive radio frequency signals; the number of the discharge circuits is equal to that of the control circuits; each control circuit is used for outputting the radio frequency signal to the corresponding radio frequency signal output interface when receiving the starting signal output by the corresponding control signal output end; and when receiving a closing signal output by the corresponding control signal output end, outputting the radio frequency signal to the corresponding discharge circuit. The utility model discloses can be respectively to the control circuit output control signal who corresponds through the control signal output part of difference to the realization is controlled respectively to the break-make of two different radio frequency circuit branch roads.
Description
Technical Field
The utility model relates to a circuit electron field especially relates to switch drive circuit and electronic switch.
Background
The radio frequency circuit can be widely applied to the fields of radar, electronic countermeasure, microwave communication, satellite communication, microwave measurement and the like. As one of the rf circuits, the rf switch circuit has been applied to more and more fields at present. In a radio frequency circuit, a switch driver, as a control switch of the circuit, directly determines the power capacity and the application range of the circuit. The existing switch driver can only be used for on-off control of a single radio frequency circuit due to low starting speed and small reverse bias voltage.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a switch driving circuit and an electronic switch, which can solve the problem that the existing switch driving can only control the on-off of a single rf circuit.
In order to achieve the above object, the present invention provides a switch driving circuit, including:
the signal input end of each control circuit is connected with the radio frequency signal input interface so as to receive radio frequency signals; the signal output end of each control circuit is respectively connected with the corresponding radio frequency signal output interface, and the control input end of each control circuit is respectively connected with the corresponding control signal output end;
the number of the discharge circuits is equal to that of the control circuits, the input end of each discharge circuit is connected with the control output end of the corresponding control circuit, and the output end of each discharge circuit is grounded;
each control circuit is used for outputting the radio frequency signal to the corresponding radio frequency signal output interface when receiving the starting signal output by the corresponding control signal output end; and when receiving a closing signal output by the corresponding control signal output end, outputting the radio frequency signal to the corresponding discharge circuit.
Optionally, each discharge circuit is a first diode, an anode of the first diode is connected with a control output end of the corresponding control circuit, and a cathode of the first diode is grounded;
the control circuit is used for providing a first bias voltage to the anode of the first diode when receiving a starting signal output by the corresponding control signal output end, and the first bias voltage is smaller than the breakover voltage of the first diode;
the control circuit is further used for providing a second bias voltage to the anode of the first diode when receiving a closing signal output by the corresponding control signal output end, and the second bias voltage is larger than the conducting voltage of the first diode.
Optionally, each control circuit includes a first transistor, a second diode, and a first capacitor;
a first end of the first capacitor is connected with a control signal output end corresponding to the control circuit, a second end of the first capacitor is connected with a base electrode of the first triode, an emitting electrode of the first triode is connected with a first power supply used for outputting a first bias voltage, a collecting electrode of the first triode is connected with an anode of the second diode, and a cathode of the second diode is connected with an anode of the first diode through the first inductor; the base electrode of the second triode is connected with the collector electrode of the first triode, the collector electrode of the second triode is connected with a second power supply for outputting a second bias voltage, and the emitting electrode of the second triode is connected with the negative electrode of the second diode;
when the control signal output end corresponding to the control circuit outputs a high level, the cathode of the second diode outputs a first bias voltage; and when the control signal output end corresponding to the control circuit outputs a low level, the cathode of the second diode outputs a second bias voltage.
Optionally, each control circuit further comprises a first resistor, a second resistor, a third resistor and a fourth resistor;
the first resistor is connected with the first capacitor in parallel; the first end of the second resistor is connected with the base electrode of the first triode, and the second end of the second resistor is connected with the emitting electrode of the first triode; the first end of the third resistor is connected with the base electrode of the second triode, and the second end of the third resistor is connected with the collector electrode of the second triode; the first end of the fourth resistor is connected with the cathode of the second diode, and the second end of the fourth resistor is connected with the anode of the first diode through the first inductor.
Optionally, each control circuit further includes a first inductor, and the second terminal of the fourth resistor is connected to the anode of the first diode through the first inductor.
Optionally, each control circuit further includes a second capacitor, a first end of the second capacitor is connected to the second end of the fourth resistor, and a second end of the second capacitor is grounded.
Optionally, each control circuit further comprises a third capacitor and a fourth capacitor;
the first end of the third capacitor is connected with the first power supply, and the second end of the third capacitor is grounded; and the first end of the fourth capacitor is connected with the second power supply, and the second end of the fourth capacitor is grounded.
Optionally, the first transistor and the second transistor are both PNP transistors.
Optionally, each control circuit further includes a fifth capacitor and a sixth capacitor, the signal input end of each control circuit is connected to the radio frequency signal input interface through the fifth capacitor, and the signal output end of each control circuit is connected to its corresponding radio frequency signal output interface through the sixth capacitor.
Further, in order to achieve the above object, the present invention also provides an electronic switch including a switch driving circuit configured as the switch driving circuit described above.
The utility model discloses a set up two radio frequency circuit branch roads of constituteing by control circuit and the discharge circuit who corresponds, can export the radio frequency signal that the radio frequency signal input interface sent to the radio frequency signal output interface that two branch roads correspond, control circuit and discharge circuit in each branch road can realize respectively that the radio frequency signal input interface passes through and opens circuit to the radio frequency branch road of the radio frequency signal output interface that this branch road corresponds. Control signals are respectively output to the corresponding control circuits through different control signal output ends so as to respectively control the on-off of two different radio frequency circuit branches.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic block diagram of a switch driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of any one of the control circuits and the corresponding discharge circuit in the embodiment of fig. 1.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
The reference numbers illustrate:
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
The utility model provides a switch drive circuit is applied to electronic switch, and this electronic switch can be touch switch, inductive switch, acoustic control switch and wireless switch etc..
Referring to fig. 1, in one embodiment, the switch driving circuit includes two control circuits and the number of discharge circuits 20 equal to the number of control circuits 10. The signal input end of each control circuit 10 is connected with the radio frequency signal input interface 30 to receive the radio frequency signal sent by the radio frequency signal input interface 30; the signal output end of each control circuit 10 is connected to the corresponding rf signal output interface 40. That is, in the switch driving circuit, there are one rf signal input interface 30 and two rf signal output interfaces 40. Each of the control circuit 10, the discharge circuit 20 and the rf signal output interface 40 forms a branch for rf signal output. The control input of each control circuit 10 is connected to a corresponding control signal output 50. The discharge circuits 20 correspond to the control circuits 10 one by one, the input end of each discharge circuit 20 is connected with the control output end of the corresponding control circuit 10, and the output end of each discharge circuit 20 is also grounded.
When each control circuit 10 receives the start signal output by the corresponding control signal output end 50, it outputs the received radio frequency signal to the corresponding radio frequency signal output interface 40; when receiving the shutdown signal output by the corresponding control signal output terminal 50, the rf signal is output to the corresponding discharge circuit 20.
In this embodiment, for any rf branch composed of the control circuit 10 and the corresponding discharge circuit 20 and the rf signal output interface 40, the rf signal input interface 30 sends an rf signal to the control circuit 10, and the control circuit 10 determines to send the rf signal to the corresponding rf signal output interface 40 or the corresponding discharge circuit 20 according to the control signal received from the control signal output terminal 50. When the control signal output terminal 50 outputs the start signal, the control circuit 10 outputs the rf signal transmitted from the rf signal input interface 30 to the corresponding rf signal output interface 40, so as to realize the communication between the rf signal input interface 30 and the rf signal output interface 40. When the control signal output terminal 50 outputs the shutdown signal, the control circuit 10 directly transmits the radio frequency signal to the discharge circuit 20, so that the radio frequency signal output interface 40 cannot receive the radio frequency signal, and the shutdown between the radio frequency signal input interface 30 and the radio frequency signal output interface 40 is realized.
In this embodiment, two rf circuit branches including the control circuit 10, the discharge circuit 20 and the rf signal output interface 40 are provided, so that the rf signal sent by the rf signal input interface 30 can be output to the rf signal output interfaces 40 corresponding to the two branches, and the control circuit 10 and the discharge circuit 20 in each branch can realize the connection and disconnection from the common rf signal input interface 30 to the branch of the rf signal output interface 40. Control signals are respectively output to the corresponding control circuits 10 through different control signal output ends 50, so that the on-off of two different radio frequency circuit branches is respectively controlled.
Further, referring to fig. 1 and fig. 2 together, fig. 2 is a schematic circuit structure diagram of any one of two branches for outputting the rf signal, the discharge circuit 20 in the switch driving circuit may be a first diode D1, an anode of the first diode D1 is connected to the control output terminal of the corresponding control circuit 10, and a cathode of the first diode D1 is grounded. For any rf branch comprising the control circuit 10, the corresponding discharging circuit 20 and the rf signal output interface 40, when the control circuit 10 receives the turn-on signal output by the corresponding control signal output terminal 50, the control circuit may provide a first bias voltage to the anode of the first diode D1, where the first bias voltage is a preset voltage value, and the first bias voltage is smaller than the turn-on voltage of the first diode D1. At this time, the first diode D1 is not turned on, so the rf signal on the branch will be output to the rf signal output interface 40, i.e. the rf branch is a pass; the control circuit 10 may provide a second bias voltage to the anode of the first diode D1 when receiving the turn-off signal output by the corresponding control signal output terminal 50, where the second bias voltage is a preset voltage value and is greater than the turn-on voltage of the first diode D1. At this time, the first diode D1 is turned on, and the rf signal outputted from the rf signal output interface 40 to the rf branch is sent to the first diode D1, so that the rf signal output interface 40 cannot receive the rf signal, i.e. the rf branch is turned off. The control signal provides different bias voltages by receiving different status signals output by the control signal output terminal 50 to switch the first diode D1 between on and off states, thereby controlling the switching on and off of the rf branch.
It should be noted that the first diode D1 may be a PIN diode.
With continued reference to fig. 1 and 2, each of the two control circuits 10 may include a first transistor Q1, a second transistor Q2, a second diode D2, a first inductor L1, and a first capacitor C1. A first end of the first capacitor C1 is connected to the control signal output terminal 50 corresponding to the control circuit 10, a second end of the first capacitor C1 is connected to a base of the first transistor Q1, an emitter of the first transistor Q1 is connected to the first power source V1, the first power source V1 can output a first bias voltage, a collector of the first transistor Q1 is connected to an anode of the second diode D2, a cathode of the second diode D2 is connected to an anode of the first diode D1 through the first inductor L1, a base of the second transistor Q2 is further connected to a collector of the first transistor Q1, a collector of the second transistor Q2 is connected to the second power source V2, the second power source V2 can output a second bias voltage, and an emitter of the second transistor Q2 is connected to a cathode of the second diode D2.
The control signal output terminal 50 connected to the control circuit 10 may output a high level or a low level. When the control signal output terminal 50 outputs a high level, the first transistor Q1 is in an off state, the second transistor Q2 is in an on state, and at this time, the voltage output by the cathode of the second diode D2 is the second bias voltage provided by the second power supply V2 connected to the second transistor Q2, and at this time, the second bias voltage on the first diode D1 is greater than the on voltage, so that the first diode D1 is turned on, the rf signal is output through the discharging circuit 20, and the rf branch is in an off state. Similarly, when the control signal output terminal 50 outputs a low level, the first transistor Q1 is turned on, the second transistor Q2 is turned off, the voltage across the first diode D1 is the first bias voltage, and the first diode D1 is turned off, so that the rf signal can be output to the rf signal output interface 40, and the rf branch is a path. The on and off states of the rf branch can be controlled by controlling the high and low levels output from the signal output terminal 50.
It is understood that the first transistor Q1 and the second transistor Q2 are PNP transistors. The emitter of the first transistor Q1 is connected to a first power supply V1, and the collector of the second transistor Q2 is connected to a second power supply V2. The first bias voltage output by the first power supply V1 may be +5V, and the second bias voltage output by the second power supply V2 may be-150V. The switch driving circuit also has a characteristic that the reverse withstand voltage is high because the second bias voltage is sufficiently large as the reverse bias voltage.
It should be noted that the first capacitor C1 is respectively connected to the control signal output terminal 50 and the base of the first transistor Q1, and the first capacitor C1 can discharge the stored electric energy at the moment when the first transistor Q1 is turned on, so as to increase the instantaneous forward current, thereby reducing the on-time of the first transistor Q1. The reduction of the on-time of the first triode Q1 can increase the speed of the control circuit 10 for controlling the on and off of the rf branch, so that the switch driving circuit can be applied to a high frequency rf circuit, and the applicability of the switch driving circuit is improved.
Further, each of the control circuits 10 may further include a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The first resistor R1 is connected in parallel with the first capacitor C1, the first end of the second resistor R2 is connected with the base electrode of the first triode Q1, and the second end of the second resistor R2 is connected with the emitter electrode of the first triode Q1; a first end of the third resistor R3 is connected with the base electrode of the second triode Q2, and a second end of the third resistor R3 is connected with the collector electrode of the second triode Q2; a first terminal of the fourth resistor R4 is connected to the cathode of the second diode D2, and a second terminal of the fourth resistor R4 is connected to the anode of the first diode D1 through the first inductor L1. The first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 are all current-limiting resistors, so that the situation that components of the switch driving circuit are damaged due to the fact that the current boosting speed is too high is avoided.
Further, each of the control circuits 10 may further include a first inductor L1, and a second terminal of the fourth resistor R4 is connected to an anode of the first diode D1 through the first inductor L1. The first inductor L1 can prevent the current output by the control output terminal of the control circuit 10 from sudden change, and prevent the current from sudden change to cause the damage of the components.
Furthermore, each of the control circuits 10 may further include a second capacitor C2, a first end of the second capacitor C2 is connected to a second end of the fourth resistor R4, and a second end of the second capacitor C2 is grounded. The second capacitor C2 and the fourth resistor R4 may form an RC filter circuit to eliminate high frequency noise signals in the control circuit 10, and prevent the on state of the first diode D1 from being affected.
Furthermore, each of the control circuits 10 may further include a third capacitor C3 and a fourth capacitor C4, a first end of the third capacitor C3 is connected to the first power source V1, and a second end of the third capacitor C3 is grounded; a first terminal of the fourth capacitor C4 is connected to the second power source V2, and a second terminal of the fourth capacitor C4 is grounded. Because the first bias voltage and the second bias voltage output by the first power supply V1 and the second power supply V2 may include a certain interference noise, the interference signals at the output ends of the first power supply V1 and the second power supply V2 can be effectively eliminated by the third capacitor C3 and the fourth capacitor C4, so that the first bias voltage and the second bias voltage are more stable.
It should be noted that the third capacitor C3 may be formed by two capacitors with different capacitance values connected in parallel. For example, two parallel capacitors may be respectively set as a microfarad capacitor and a picofard capacitor to respectively filter different types of noise. For example, the two capacitors may have capacitance values of 100pF and 0.1uF, respectively, to improve the filtering capability for different types of noise in the voltage output by the first power supply V1. Similarly, the fourth capacitor C4 may also be formed by two capacitors with different capacitance values connected in parallel, and the capacitance values of the two capacitors may be 100pF and 0.1uF, respectively.
In a preferred embodiment, each of the control circuits 10 may include a fifth capacitor C5 and a sixth capacitor C6, a signal input terminal of each of the control circuits 10 is connected to the rf signal input interface 30 through the fifth capacitor C5, and a signal output terminal of each of the control circuits 10 is connected to the corresponding rf signal output interface 40 through the sixth capacitor C6. The fifth capacitor C5 and the sixth capacitor C6 may filter the dc signal in the rf branch to prevent the dc noise signal from interfering with the transmission of the rf signal.
The utility model also provides an electronic switch, this electronic switch include switch drive circuit, and above-mentioned embodiment can be referred to this switch drive circuit's structure, no longer gives unnecessary details here. It should be understood that, since the electronic switch of the present embodiment adopts the technical solution of the switch driving circuit, the electronic switch has all the advantages of the switch driving circuit.
The above is only the optional embodiment of the present invention, and not therefore the scope of the present invention is limited, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (10)
1. A switch drive circuit, comprising:
the signal input end of each control circuit is connected with the radio frequency signal input interface so as to receive radio frequency signals; the signal output end of each control circuit is respectively connected with the corresponding radio frequency signal output interface, and the control input end of each control circuit is respectively connected with the corresponding control signal output end;
the number of the discharge circuits is equal to that of the control circuits, the input end of each discharge circuit is connected with the control output end of the corresponding control circuit, and the output end of each discharge circuit is grounded;
each control circuit is used for outputting the radio frequency signal to the corresponding radio frequency signal output interface when receiving the starting signal output by the corresponding control signal output end; and when receiving a closing signal output by the corresponding control signal output end, outputting the radio frequency signal to the corresponding discharge circuit.
2. The switch driving circuit according to claim 1, wherein each of the discharge circuits is a first diode, an anode of the first diode is connected to the control output terminal of its corresponding control circuit, and a cathode of the first diode is grounded;
the control circuit is used for providing a first bias voltage to the anode of the first diode when receiving a starting signal output by the corresponding control signal output end, and the first bias voltage is smaller than the breakover voltage of the first diode;
the control circuit is further used for providing a second bias voltage to the anode of the first diode when receiving a closing signal output by the corresponding control signal output end, and the second bias voltage is larger than the conducting voltage of the first diode.
3. The switch driver circuit according to claim 2, wherein each of the control circuits comprises a first transistor, a second diode, a first inductor, and a first capacitor;
a first end of the first capacitor is connected with a control signal output end corresponding to the control circuit, a second end of the first capacitor is connected with a base electrode of the first triode, an emitting electrode of the first triode is connected with a first power supply used for outputting a first bias voltage, a collecting electrode of the first triode is connected with an anode of the second diode, and a cathode of the second diode is connected with an anode of the first diode through the first inductor; the base electrode of the second triode is connected with the collector electrode of the first triode, the collector electrode of the second triode is connected with a second power supply for outputting a second bias voltage, and the emitting electrode of the second triode is connected with the negative electrode of the second diode;
when the control signal output end corresponding to the control circuit outputs a high level, the cathode of the second diode outputs a first bias voltage; and when the control signal output end corresponding to the control circuit outputs a low level, the cathode of the second diode outputs a second bias voltage.
4. The switch driver circuit according to claim 3, wherein each of the control circuits further comprises a first resistor, a second resistor, a third resistor, and a fourth resistor;
the first resistor is connected with the first capacitor in parallel; the first end of the second resistor is connected with the base electrode of the first triode, and the second end of the second resistor is connected with the emitting electrode of the first triode; the first end of the third resistor is connected with the base electrode of the second triode, and the second end of the third resistor is connected with the collector electrode of the second triode; the first end of the fourth resistor is connected with the cathode of the second diode, and the second end of the fourth resistor is connected with the anode of the first diode through the first inductor.
5. The switch driver circuit according to claim 4, wherein each of the control circuits further comprises a first inductor, and the second terminal of the fourth resistor is connected to the anode of the first diode through the first inductor.
6. The switch driver circuit according to claim 5, wherein each of the control circuits further comprises a second capacitor, a first terminal of the second capacitor is connected to a second terminal of the fourth resistor, and a second terminal of the second capacitor is grounded.
7. The switch driver circuit according to claim 3, wherein each of the control circuits further comprises a third capacitor and a fourth capacitor;
the first end of the third capacitor is connected with the first power supply, and the second end of the third capacitor is grounded; and the first end of the fourth capacitor is connected with the second power supply, and the second end of the fourth capacitor is grounded.
8. The switch driver circuit of any of claims 3-7, wherein the first transistor and the second transistor are both PNP type transistors.
9. The switch driver circuit according to any of claims 1-7, wherein each control circuit further comprises a fifth capacitor and a sixth capacitor, the signal input terminal of each control circuit is connected to the radio frequency signal input interface through the fifth capacitor, and the signal output terminal of each control circuit is connected to its corresponding radio frequency signal output interface through the sixth capacitor.
10. An electronic switch, characterized in that it comprises a switch driving circuit configured as a switch driving circuit according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921448084.XU CN210297672U (en) | 2019-09-02 | 2019-09-02 | Switch drive circuit and electronic switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921448084.XU CN210297672U (en) | 2019-09-02 | 2019-09-02 | Switch drive circuit and electronic switch |
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| Publication Number | Publication Date |
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| CN210297672U true CN210297672U (en) | 2020-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921448084.XU Withdrawn - After Issue CN210297672U (en) | 2019-09-02 | 2019-09-02 | Switch drive circuit and electronic switch |
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| CN (1) | CN210297672U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110460325A (en) * | 2019-09-02 | 2019-11-15 | 深圳市强军科技有限公司 | Switch driving circuit and electronic switch |
| CN110460325B (en) * | 2019-09-02 | 2024-10-22 | 深圳市强军科技有限公司 | Switch driving circuit and electronic switch |
-
2019
- 2019-09-02 CN CN201921448084.XU patent/CN210297672U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110460325A (en) * | 2019-09-02 | 2019-11-15 | 深圳市强军科技有限公司 | Switch driving circuit and electronic switch |
| CN110460325B (en) * | 2019-09-02 | 2024-10-22 | 深圳市强军科技有限公司 | Switch driving circuit and electronic switch |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200410 Effective date of abandoning: 20241022 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200410 Effective date of abandoning: 20241022 |