CN219247462U - Input voltage protection circuit supporting soft start and radio frequency switch device - Google Patents
Input voltage protection circuit supporting soft start and radio frequency switch device Download PDFInfo
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- CN219247462U CN219247462U CN202320783258.8U CN202320783258U CN219247462U CN 219247462 U CN219247462 U CN 219247462U CN 202320783258 U CN202320783258 U CN 202320783258U CN 219247462 U CN219247462 U CN 219247462U
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
An input voltage protection circuit supporting soft start and a radio frequency switch device comprise an input overvoltage protection module and a soft start module, wherein the input overvoltage protection module can enable a voltage input end and a voltage output end to be communicated when the voltage value of a voltage signal input by the voltage input end is smaller than or equal to a preset voltage value, so that the voltage output end outputs the voltage signal input by the voltage input end, and the voltage input end and the voltage output end are disconnected when the voltage value of the voltage signal input by the voltage input end is larger than the preset voltage value; the soft start module is used for controlling the voltage input end to be communicated with the voltage output end after the voltage input end starts to input the first time of the voltage signal; therefore, the soft start function of the input overvoltage protection module is realized while the input voltage protection is realized.
Description
Technical Field
The application relates to the technical field of power supplies, in particular to an input voltage protection circuit supporting soft start and a radio frequency switching device.
Background
The rf switching circuit is typically powered using a power adapter, and if a user mistakenly uses a non-standard adapter to power the rf switching circuit, an excessive voltage input to the rf switching circuit may occur, resulting in the rf switching circuit being damaged.
As shown in fig. 1, fig. 1 shows a typical input overvoltage protection circuit, when the input voltage VIN is lower than a preset voltage (e.g. 5.7V), the switching tube Q11 is not turned on, the gate voltage of the switching tube Q12 is close to 0V, the switching tube Q12 is turned on, and the output voltage VOUT normally outputs the input voltage VIN; when the input voltage is higher than a preset voltage (e.g., 5.7V), the switching tube Q11 is turned on, and the gate voltage of the switching tube Q12 is approximately equal to VIN, the switching tube Q12 is turned off, and the output voltage VOUT is 0. In fig. 1, the voltage value of the preset voltage can be modified by setting a zener diode D11 of a different model, so as to modify the voltage point of the input overvoltage protection. However, in the input overvoltage protection circuit shown in fig. 1, the switching tube Q12 is directly turned on when being powered on (the input voltage VIN is lower than a preset voltage), if the output terminal is connected with a larger capacitive load, the switching tube Q12 is damaged due to the peak current generated at the instant of turning on the switching tube Q12.
Therefore, there is a need for an input voltage protection circuit supporting soft start.
Disclosure of Invention
The application provides an input voltage protection circuit supporting soft start, which can realize soft start function of the input voltage protection circuit while realizing input voltage protection.
According to an aspect of the present application, there is provided an input voltage protection circuit supporting soft start in an embodiment, including:
the input overvoltage protection module is connected between the voltage input end and the voltage output end and is used for enabling the voltage input end and the voltage output end to be communicated when the voltage value of the voltage signal input by the voltage input end is smaller than or equal to a preset voltage value so as to enable the voltage output end to output the voltage signal input by the voltage input end; the input overvoltage protection module is further used for disconnecting the voltage input end and the voltage output end when the voltage value of the voltage signal input by the voltage input end is larger than a preset voltage value;
and the soft start module is connected with the input overvoltage protection module and is used for controlling the voltage input end to be communicated with the voltage output end after the voltage input end starts to input the first time of the voltage signal.
In an embodiment, the input overvoltage protection module includes:
the first switch unit is connected to the voltage input end and is used for acquiring a voltage signal input by the voltage input end, and when the voltage value of the voltage signal input by the voltage input end is smaller than or equal to a preset voltage value, the first switch unit is turned off to output a first signal; the first switch unit is further configured to switch on the first switch unit to output a second signal when a voltage value of the voltage signal input by the voltage input terminal is greater than a preset voltage value;
the second switch unit is connected between the voltage input end and the voltage output end and is used for acquiring a signal output by the first switch unit, and when the signal output by the first switch unit is a first signal, the second switch unit is conducted so as to output a voltage signal input by the voltage input end; the second switch unit is further configured to switch off the second switch unit when the signal output by the first switch unit is a second signal.
In an embodiment, the first switching unit includes: a switching tube Q1, a zener diode D1, a resistor R1 and a resistor R2;
the switching tube Q1 comprises a first pole, a second pole and a control pole, the first pole of the switching tube Q1 is connected with the voltage input end, the control pole of the switching tube Q1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the voltage input end, one end of the resistor R1 connected with the resistor R2 is connected with the cathode of a zener diode D1, and the anode of the zener diode D1 is connected with the ground; the second pole of the switching tube Q1 is used for outputting the first signal or the second signal.
In an embodiment, the second switching unit includes: a switching tube Q2, a capacitor C1, a resistor R7 and a resistor R3;
the switching tube Q2 comprises a first pole, a second pole and a control pole, the first pole of the switching tube Q2 is connected with the voltage input end, the second pole of the switching tube Q2 is connected with the voltage output end, the control pole of the switching tube Q2 is used for acquiring the first signal or the second signal, the control pole of the switching tube Q2 is connected with the first pole of the switching tube Q2 through a capacitor C1, a resistor R7 is connected in parallel with two ends of the capacitor C1, one end of a resistor R3 is connected with the control pole of the switching tube Q2, and the other end of the resistor R3 is used for being connected with the soft start module.
In one embodiment, the soft start module includes: a switching tube Q3, a resistor R6, a resistor R8 and a capacitor C2;
the switching tube Q3 comprises a first pole, a second pole and a control pole, the first pole of the switching tube Q3 is used for being connected with the second switching unit, the second pole of the switching tube Q3 is connected with the ground, the control pole of the switching tube Q3 is connected with the ground through a resistor R8, a capacitor C2 is connected in parallel with two ends of the capacitor C2, one end of the resistor R6 is connected with the voltage input end, and the other end of the resistor R6 is connected with one end of the resistor R8 connected with the control pole of the switching tube Q3.
In an embodiment, further comprising:
the first indicating module is connected with the input overvoltage protection module and is used for indicating an input overvoltage state to a user when the voltage value of the voltage signal input by the voltage input end is larger than a preset voltage value;
the second indicating module is connected with the voltage output end and indicates a normal working state to a user when the voltage output end outputs the voltage signal input by the voltage input end.
In an embodiment, the first indication module includes an indicator LED1, and when a voltage value of the voltage signal input by the voltage input terminal is greater than a preset voltage value, the indicator LED1 is turned on.
In an embodiment, the second indication module includes an indication lamp LED2, and the indication lamp LED2 is turned on when the voltage output terminal outputs the voltage signal input by the voltage input terminal.
According to an aspect of the present application, there is provided in one embodiment a radio frequency switching device, including:
a radio frequency switching circuit;
the input voltage protection circuit is the input voltage protection circuit according to any one of the embodiments, and the input voltage protection circuit is connected between a power supply and a radio frequency switch circuit, and is configured to disconnect power supplied from the power supply to the radio frequency switch circuit when a voltage value of an input voltage signal input by the power supply is greater than a preset voltage value.
According to the embodiment, the input voltage protection circuit and the radio frequency switch device supporting soft start comprise an input overvoltage protection module and a soft start module, wherein the input overvoltage protection module can enable a voltage input end and a voltage output end to be communicated when the voltage value of a voltage signal input by a voltage input end is smaller than or equal to a preset voltage value, so that the voltage output end outputs the voltage signal input by the voltage input end, and enable the voltage input end and the voltage output end to be disconnected when the voltage value of the voltage signal input by the voltage input end is larger than the preset voltage value; the soft start module is used for controlling the voltage input end to be communicated with the voltage output end after the voltage input end starts to input the first time of the voltage signal; therefore, the soft start function of the input overvoltage protection module is realized while the input voltage protection is realized.
Drawings
FIG. 1 is a schematic diagram of a typical input overvoltage protection circuit;
FIG. 2 is a schematic diagram of an input voltage protection circuit supporting soft start according to an embodiment of the present application;
FIG. 3 is a circuit diagram of an input voltage protection circuit supporting soft start according to one embodiment;
fig. 4 is a schematic structural diagram of a radio frequency switch device according to an embodiment of the present application.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings by way of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations based on the description herein and the general knowledge of one skilled in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments, and the operational steps involved in the embodiments may be sequentially exchanged or adjusted in a manner apparent to those skilled in the art. Accordingly, the description and drawings are merely for clarity of describing certain embodiments and are not necessarily intended to imply a required composition and/or order.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.
In the application, the input overvoltage protection module comprises a switching tube Q2 connected between a voltage input end and a voltage output end, and the soft start module is connected to a control electrode of the switching tube Q2, so that soft start of the switching tube Q2 can be realized when the voltage value of a voltage signal input by the voltage input end is smaller than or equal to a preset voltage value after the voltage input end is electrified, and peak current cannot be generated at the conduction moment of the switching tube Q2 when the output end of the input overvoltage protection module is connected with a larger capacitive load, so that the switching tube Q2 is prevented from being damaged; and the first indicating module and the second indicating module are further added, so that the input overvoltage state can be indicated to a user when the input overvoltage condition occurs, and the normal working state can be indicated to the user when the device works normally.
Referring to fig. 2, the present embodiment provides an input voltage protection circuit supporting soft start, hereinafter referred to as an input voltage protection circuit, where the input voltage protection circuit includes an input overvoltage protection module 101, a soft start module 102, a first indication module 103 and a second indication module 104; the input overvoltage protection module 101 is connected between the voltage input end and the voltage output end, the soft start module 102 is connected to the input overvoltage protection module 101, the first indication module 103 is connected to the input overvoltage protection module 101, and the second indication module 104 is connected to the voltage output end.
Referring to fig. 3, fig. 3 is a circuit schematic of an input voltage protection circuit supporting soft start according to an embodiment, where V1 represents a power supply for providing a voltage signal VIN input by a voltage input terminal, and detailed circuit structures of the respective modules are described below.
In an embodiment, the input overvoltage protection module 101 includes a first switch unit and a second switch unit, where the first switch unit is connected to the voltage input end and is configured to obtain a voltage signal VIN input by the voltage input end, and when a voltage value of the voltage signal VIN input by the voltage input end is less than or equal to a preset voltage value, the first switch unit is turned off to output a first signal; the first switch unit is further configured to conduct when a voltage value of the voltage signal VIN input at the voltage input terminal is greater than a preset voltage value, so as to output a second signal. The first signal or the second signal output by the first switch unit is used for controlling the on or off of the second switch unit. The second switch unit is connected between the voltage input end and the voltage output end and is used for acquiring a signal output by the first switch unit, when the signal output by the first switch unit is a first signal, the second switch unit is conducted to output a voltage signal input by the voltage input end, and the signal output by the second switch unit is VOUT; the second switch unit is also used for turning off the second switch unit when the signal output by the first switch unit is a second signal.
Based on the above-mentioned structure of the input overvoltage protection module 101, the second switch unit is configured to control the connection or disconnection between the voltage input terminal and the voltage output terminal, and the on or off of the second switch unit is responsive to the first switch unit output signal as the first signal or the second signal, and the signal output by the first switch unit is responsive to the magnitude of the voltage signal VIN input by the voltage input terminal. Thus, when the input voltage signal VIN is greater than a preset voltage value, the first switch unit outputs a second signal, and the second switch unit is turned off in response to the second signal to disconnect the connection between the voltage input terminal and the voltage output terminal, so that the voltage output terminal has no output signal; when the input voltage signal VIN is smaller than or equal to a preset voltage value, the first switch unit outputs a first signal, and the second switch unit is turned on in response to the first signal to connect the voltage input end and the voltage output end, so that the signal VOUT output by the voltage output end is approximately equal to the input voltage signal VIN. Therefore, an input overvoltage protection function is realized, and in addition, the preset voltage value can be modified according to actual conditions.
In one example, a first switching unit includes: a switching tube Q1, a zener diode D1, a resistor R1 and a resistor R2. The switching tube Q1 comprises a first pole, a second pole and a control pole, the first pole of the switching tube Q1 is connected with the voltage input end, the control pole of the switching tube Q1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the voltage input end, one end of the resistor R1 connected with the resistor R2 is connected with the cathode of a zener diode D1, and the anode of the zener diode D1 is connected with the ground; the second pole of the switching tube Q1 is used for outputting the first signal or the second signal. In the embodiment shown in fig. 3, the switching tube Q1 is a PNP-type triode, the first pole of the switching tube Q1 is an emitter, the second pole of the switching tube Q1 is a collector, the control pole of the switching tube Q1 is a base, in which the preset voltage value is determined by the reverse breakdown voltage of the zener diode D1, for example, the reverse breakdown voltage of the zener diode D1 with the model ZPD12 is 12V, when VIN < = 12V, the zener diode D1 is not broken down reversely, the impedance is very high, so that the emitter and base voltages of the switching tube Q1 are equal, and the switching tube Q1 is turned off; when 12V < vin < = 12.6V, the zener diode D1 breaks down reversely, the impedance becomes smaller, but the voltage VBE between the base and the emitter of the switching tube Q1 does not reach the on condition, and the switching tube Q1 is turned off; when VIN is more than 12.6V, the zener diode D1 breaks down in direction, the impedance is reduced, the emitter voltage of the switching tube Q1 is 0.6V higher than the base voltage, and the switching tube Q1 is conducted; in summary, when VIN < = 12.6V, the switching tube Q1 is turned off, and the collector of the switching tube Q1 is used as the output end of the first switching unit to output the first signal; when VIN is more than 12.6V, the switch tube Q1 is conducted, the collector of the switch tube Q1 is used as the output end of the first switch unit, and a second signal is output.
In one example, the second switching unit includes a switching tube Q2, a capacitor C1, a resistor R7, and a resistor R3; the switching tube Q2 comprises a first pole, a second pole and a control pole, the first pole of the switching tube Q2 is connected with the voltage input end, the second pole of the switching tube Q2 is connected with the voltage output end, the control pole of the switching tube Q2 is used for acquiring a first signal or a second signal, the control pole of the switching tube Q2 is further connected with the first pole of the switching tube Q2 through a capacitor C1, a resistor R7 is connected in parallel with two ends of the capacitor C1, one end of a resistor R3 is connected with the control pole of the switching tube Q2, and the other end of the resistor R3 is used for being connected with the soft start module 102. The switching transistor Q2 shown in FIG. 3 is a power PMOS transistor (P-channel power field effect transistor), the first pole of the switching transistor Q2 is the source, the second pole is the drain, and the control pole is the gate, in this embodiment, at VIN<When the switching tube Q1 is turned off, the control electrode of the switching tube Q2 obtains the first signal, and the gate voltage VG2 of the switching tube Q2 is equal to VIN (R3/(r3+r7)), due to VGs2<VGS2 TH Wherein VGS2 TH VGS2 of PMOS tube for conducting voltage of switch tube Q2 TH Less than 0, the switching tube Q2 is conducted, the drain electrode of the switching tube Q2 is used as the output end of the second switching unit, and the output voltage VOUT approximately equals VIN; at VIN>12.6V, the gate voltage VG of the switching tube Q2 is approximately equal to the gate voltage VG of the switching tube Q1 when the switching tube Q1 is turned onVIN, switching tube Q2 is off, no output voltage.
As can be seen from the above description, when the voltage signal VIN input by the voltage input terminal is greater than 12.6V, the switching tube Q2 is turned off, and no output voltage is generated, so that the input overvoltage protection function can be realized. In addition, the voltage point of the overvoltage protection is the reverse breakdown voltage of the zener diode D1 and the forward conduction voltage drop VBE (generally 0.6V) of the triode (switching tube Q1), so when the voltage point of the overvoltage protection needs to be modified, only the model of the zener diode D1 needs to be modified, and different voltage points of the overvoltage protection can be set.
In this embodiment, when an input overvoltage condition occurs, in addition to the disconnection between the voltage input terminal and the voltage output terminal through the input overvoltage protection module 101, a first indication module 103 and a second indication module 104 are further added, and the first indication module 103 and the second indication module 104 can prompt the user that the circuit is in the input overvoltage state or the normal working state. Wherein:
the first indication module 103 is connected to the input overvoltage protection module 101, and indicates to a user that an overvoltage condition is input when a voltage value of the voltage signal input at the voltage input terminal is greater than a preset voltage value. In one example, as shown in fig. 3, the first indication module 103 includes an indicator LED1, where the indicator LED1 is connected to the collector of the switching tube Q1 through a resistor R5, and when the collector of the switching tube Q1 outputs a second signal, that is, when the voltage value of the voltage signal input at the voltage input terminal is greater than a preset voltage value, the indicator LED1 is turned on to prompt the user that the circuit is in an input overvoltage state.
The second indication module 104 is connected to the voltage output terminal, and indicates a normal operating state to the user when the voltage output terminal outputs the voltage signal input by the voltage input terminal. In one example, as shown in fig. 3, the second indication module 104 includes an indicator LED2, where the indicator LED2 is connected to a voltage output terminal through a resistor R4, and when there is an output voltage at the voltage output terminal, the LED2 is turned on to prompt the user that the circuit is in a normal operating state.
Because the switching tube Q2 may be a power MOS tube, and the switching speed of the power MOS tube is very fast, when the drain electrode of the switching tube Q2 is connected with a larger capacitive load, the switching tube Q2 will flow a very large peak current, which may cause the switching tube Q2 to be damaged.
In one example, as in fig. 3, the soft start module includes: a switching tube Q3, a resistor R6, a resistor R8 and a capacitor C2; the switching tube Q3 comprises a first pole, a second pole and a control pole, the first pole of the switching tube Q3 is used for being connected with the control pole of the switching tube Q2 of the second switching unit, the second pole of the switching tube Q3 is connected with the ground, the control pole of the switching tube Q3 is connected with the ground through a resistor R8, a capacitor C2 is connected in parallel with two ends of the capacitor C2, one end of the resistor R6 is connected with a voltage input end, and the other end of the resistor R6 is connected with one end of the resistor R8 connected with the control pole of the switching tube Q3. The switching tube Q3 is an NMOS tube (N-channel field effect tube), the first electrode of the switching tube Q3 is a source electrode, the second electrode is a drain electrode, and the control electrode is a gate electrode. When the voltage input end starts to input a voltage signal, the input voltage signal charges the capacitor C2 through the resistor R6, the gate voltage VG of the switching tube Q3 is slowly increased in the charging process, and the voltage is reduced in VGS3<VGS3 TH When the switching tube Q3 is turned off, the source voltage of the switching tube Q2 is equal to the grid voltage and VIN, and the switching tube Q2 is turned off; at the gate voltage VGS3 of the switching tube Q3>＝VGS3 TH The switching tube Q3 starts to be turned on, and then due to the capacitor C1, the gate voltage VG2 of the switching tube Q2 is slowly reduced from VIN to VIN (R3/(r3+r7)), instead of instantaneously reduced to VIN (R3/(r3+r7)), so that the switching tube Q2 is turned on after the first time when the voltage input terminal starts to input the voltage signal, and a slow conduction process is performed, and even if the voltage output terminal has a larger capacitive load, a larger peak current is not generated, thereby protecting the switching tube Q2. In this embodiment, the first time is related to the capacitance of the capacitor C2 and the capacitor C1.
In summary, the input voltage protection circuit supporting soft start provided by the application can prompt a user in an overvoltage state while realizing input overvoltage protection, and has a soft start function.
Referring to fig. 4, the present application further provides a radio frequency switch device, which includes a radio frequency switch circuit 201 and an input voltage protection circuit 202, wherein the radio frequency switch circuit 201 may be any existing radio frequency switch circuit, and the input voltage protection circuit 202 is the input voltage protection circuit provided by any of the above embodiments, and since the specific implementation of the input voltage protection circuit is described in the above embodiments, the details are not repeated here.
The foregoing description of specific examples has been presented only to aid in the understanding of the present application and is not intended to limit the present application. Several simple deductions, modifications or substitutions may also be made by the person skilled in the art to which the present application pertains, according to the idea of the present application.
Claims (9)
1. An input voltage protection circuit supporting soft start, comprising:
the input overvoltage protection module is connected between the voltage input end and the voltage output end and is used for enabling the voltage input end and the voltage output end to be communicated when the voltage value of the voltage signal input by the voltage input end is smaller than or equal to a preset voltage value so as to enable the voltage output end to output the voltage signal input by the voltage input end; the input overvoltage protection module is further used for disconnecting the voltage input end and the voltage output end when the voltage value of the voltage signal input by the voltage input end is larger than a preset voltage value;
and the soft start module is connected with the input overvoltage protection module and is used for controlling the voltage input end to be communicated with the voltage output end after the voltage input end starts to input the first time of the voltage signal.
2. The input voltage protection circuit of claim 1, wherein the input overvoltage protection module comprises:
the first switch unit is connected to the voltage input end and is used for acquiring a voltage signal input by the voltage input end, and when the voltage value of the voltage signal input by the voltage input end is smaller than or equal to a preset voltage value, the first switch unit is turned off to output a first signal; the first switch unit is further configured to switch on the first switch unit to output a second signal when a voltage value of the voltage signal input by the voltage input terminal is greater than a preset voltage value;
the second switch unit is connected between the voltage input end and the voltage output end and is used for acquiring a signal output by the first switch unit, and when the signal output by the first switch unit is a first signal, the second switch unit is conducted so as to output a voltage signal input by the voltage input end; the second switch unit is further configured to switch off the second switch unit when the signal output by the first switch unit is a second signal.
3. The input voltage protection circuit of claim 2, wherein the first switching unit comprises: a switching tube Q1, a zener diode D1, a resistor R1 and a resistor R2;
the switching tube Q1 comprises a first pole, a second pole and a control pole, the first pole of the switching tube Q1 is connected with the voltage input end, the control pole of the switching tube Q1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the voltage input end, one end of the resistor R1 connected with the resistor R2 is connected with the cathode of a zener diode D1, and the anode of the zener diode D1 is connected with the ground; the second pole of the switching tube Q1 is used for outputting the first signal or the second signal.
4. The input voltage protection circuit of claim 2, wherein the second switching unit comprises: a switching tube Q2, a capacitor C1, a resistor R7 and a resistor R3;
the switching tube Q2 comprises a first pole, a second pole and a control pole, the first pole of the switching tube Q2 is connected with the voltage input end, the second pole of the switching tube Q2 is connected with the voltage output end, the control pole of the switching tube Q2 is used for acquiring the first signal or the second signal, the control pole of the switching tube Q2 is connected with the first pole of the switching tube Q2 through a capacitor C1, a resistor R7 is connected in parallel with two ends of the capacitor C1, one end of a resistor R3 is connected with the control pole of the switching tube Q2, and the other end of the resistor R3 is used for being connected with the soft start module.
5. The input voltage protection circuit of claim 2, wherein the soft start module comprises: a switching tube Q3, a resistor R6, a resistor R8 and a capacitor C2;
the switching tube Q3 comprises a first pole, a second pole and a control pole, the first pole of the switching tube Q3 is used for being connected with the second switching unit, the second pole of the switching tube Q3 is connected with the ground, the control pole of the switching tube Q3 is connected with the ground through a resistor R8, a capacitor C2 is connected in parallel with two ends of the capacitor C2, one end of the resistor R6 is connected with the voltage input end, and the other end of the resistor R6 is connected with one end of the resistor R8 connected with the control pole of the switching tube Q3.
6. The input voltage protection circuit of any one of claims 1 to 5, further comprising:
the first indicating module is connected with the input overvoltage protection module and is used for indicating an input overvoltage state to a user when the voltage value of the voltage signal input by the voltage input end is larger than a preset voltage value;
the second indicating module is connected with the voltage output end and indicates a normal working state to a user when the voltage output end outputs the voltage signal input by the voltage input end.
7. The input voltage protection circuit of claim 6, wherein the first indication module comprises an indicator light LED1, the indicator light LED1 being illuminated when a voltage value of the voltage signal input at the voltage input terminal is greater than a preset voltage value.
8. The input voltage protection circuit of claim 6 wherein said second indicator module comprises an indicator light LED2, said indicator light LED2 being illuminated when said voltage output outputs a voltage signal input by said voltage input.
9. A radio frequency switching device, comprising:
a radio frequency switching circuit;
an input voltage protection circuit, wherein the input voltage protection circuit is an input voltage protection circuit according to any one of claims 1 to 8, and the input voltage protection circuit is connected between a power supply and a radio frequency switch circuit, and is used for disconnecting the power supply from the power supply to the radio frequency switch circuit when the voltage value of an input voltage signal input by the power supply is greater than a preset voltage value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320783258.8U CN219247462U (en) | 2023-03-30 | 2023-03-30 | Input voltage protection circuit supporting soft start and radio frequency switch device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320783258.8U CN219247462U (en) | 2023-03-30 | 2023-03-30 | Input voltage protection circuit supporting soft start and radio frequency switch device |
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| CN219247462U true CN219247462U (en) | 2023-06-23 |
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