CN216720904U - Surge protection circuit based on-off keying input - Google Patents
Surge protection circuit based on-off keying input Download PDFInfo
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- CN216720904U CN216720904U CN202123384913.2U CN202123384913U CN216720904U CN 216720904 U CN216720904 U CN 216720904U CN 202123384913 U CN202123384913 U CN 202123384913U CN 216720904 U CN216720904 U CN 216720904U
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Abstract
The utility model discloses a surge protection circuit based on-off keying input, which comprises a first protection circuit, a second protection circuit, a bias circuit and an on-off key controller, wherein the first protection circuit is connected with the first protection circuit; through setting up first protection circuit, second protection circuit and biasing circuit, thereby discharge the surge of the heavy current or the large voltage of on-off keying circuit end input through first protection circuit earlier and realize the one-level protection, rethread second protection circuit suppresses the residual voltage that leaves after the one-level protection, and simultaneously, the control signal and the power signal separation of on-off keying circuit end through biasing circuit with the input, thereby make final input system's power and signal not disturbed, effectual improvement is to the surge protection of on-off keying circuit.
Description
Technical Field
The utility model relates to the technical field of antenna electrically-tunable controllers, in particular to a surge protection circuit based on-off keying input.
Background
On-off-keying (OOK) modulation, also known as binary on-off keying. The modulation principle is as follows: the frequency of transmission is controlled according to the transmission amplitude, if the transmission amplitude is high, the carrier frequency is transmitted, and if the transmission amplitude is low, the carrier frequency is not transmitted, so that the power consumption is low. Therefore, an OOK modulation method is usually used in an antenna feed system to couple a power source and a carrier wave for transmission together.
And when a large current or a large voltage is input to the OOK terminal, the circuit device will be damaged. Therefore, in an application environment based on an antenna base station, surge protection needs to be performed on a modem external-pair device input at the OOK end.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the surge protection circuit based on the on-off keying input is provided, and the surge protection effect of the on-off keying circuit is improved.
In order to solve the technical problems, the utility model adopts the technical scheme that:
a surge protection circuit based on-off keying input comprises a first protection circuit, a second protection circuit, a bias circuit and an on-off key controller;
the input end of the on-off keyer is used for receiving signals;
the input end of the first protection circuit is connected with the output end of the on-off key controller;
the input end of the bias circuit is connected with the output end of the on-off keyer;
the output end of the bias circuit is connected with the second protection circuit.
Further, the bias circuit includes a first inductance and a fourth capacitance;
one end of the first inductor is connected with the output end of the on-off key controller;
the other end of the first inductor is connected with the input end of the second protection circuit;
one end of the fourth capacitor is connected with the one end of the first inductor and the output end of the on-off key controller respectively;
the other end of the fourth capacitor is connected with the working ground.
Further, the second protection circuit comprises a first resistor and a transient diode;
one end of the first resistor is connected with the other end of the first inductor;
the other end of the first resistor is connected with one end of the transient diode;
the other end of the transient diode is connected to the working ground.
Further, the device also comprises a matching circuit;
the matching circuit comprises a second capacitor and a third capacitor;
one end of the second capacitor is connected with one end of the fourth capacitor, and the other end of the second capacitor is connected with the working ground;
one end of the third capacitor is connected with the other end of the fourth capacitor, and the other end of the third capacitor is connected with the working ground.
Furthermore, the capacitance value of the second capacitor is 470pF, the capacitance value of the third capacitor is 820pF, and the capacitance value of the fourth capacitor is 220 nF.
Further, the first protection circuit comprises a gas discharge tube and a first capacitor;
one end of the gas discharge tube is connected with the output end of the on-off key controller;
the other end of the gas discharge tube is connected with a protective ground;
one end of the first capacitor is connected with one end of the gas discharge tube and the output end of the on-off key controller respectively;
the other end of the first capacitor is connected with a protective ground.
The utility model has the beneficial effects that: through setting up first protection circuit, second protection circuit and biasing circuit, thereby discharge through the surge of first protection circuit to the heavy current of on-off keying circuit end input or large voltage and realize the one-level protection earlier, rethread second protection circuit suppresses the residual voltage that leaves after the one-level protection, and simultaneously, control signal and the power signal separation of on-off keying circuit end through biasing circuit with the input, thereby make final input system's power and signal not disturbed, effectual improvement is to the surge protection effect of on-off keying circuit.
Drawings
Fig. 1 is a schematic block diagram of a surge protection circuit based on-off keying input in this embodiment;
fig. 2 is a schematic circuit structure diagram of a surge protection circuit based on-off keying input in this embodiment;
description of reference numerals:
r1, a first resistor; c1, a first capacitance; c2, a second capacitor; c3, a third capacitance; c4, a fourth capacitance; l1, a first inductor; g1, gas discharge tube; d1, transient diode; u1, on-off keyer.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, a surge protection circuit based on-off keying input includes a first protection circuit, a second protection circuit, a bias circuit and an on-off key controller;
the input end of the on-off keyer is used for receiving signals;
the input end of the first protection circuit is connected with the output end of the on-off key controller;
the input end of the bias circuit is connected with the output end of the on-off keyer;
the output end of the bias circuit is connected with the second protection circuit.
As can be seen from the above description, the beneficial effects of the present invention are: through setting up first protection circuit, second protection circuit and biasing circuit, thereby discharge the surge of the heavy current or the large voltage of on-off keying circuit end input through first protection circuit earlier and realize the one-level protection, rethread second protection circuit suppresses the residual voltage that leaves after the one-level protection, and simultaneously, the control signal and the power signal separation of on-off keying circuit end through biasing circuit with the input, thereby make final input system's power and signal not disturbed, effectual improvement is to the surge protection of on-off keying circuit.
Further, the bias circuit includes a first inductance and a fourth capacitance;
one end of the first inductor is connected with the output end of the on-off key controller;
the other end of the first inductor is connected with the input end of the second protection circuit;
one end of the fourth capacitor is connected with the output end of the on-off key controller;
the other end of the fourth capacitor is connected with the working ground.
As can be seen from the above description, the first inductor and the fourth capacitor form a bias circuit, and the characteristic that the inductor is connected between dc and ac and the characteristic that the capacitor is connected between ac and dc can be used to separate the control signal of the on-off keying circuit from the power supply, that is, the control signal is input from the fourth capacitor terminal and the power supply is input from the first inductor terminal, thereby achieving the bias effect.
Further, the second protection circuit comprises a first resistor and a transient diode;
one end of the first resistor is connected with the other end of the first inductor;
the other end of the first resistor is connected with one end of the transient diode;
the other end of the transient diode is connected to the working ground.
According to the above description, the first resistor and the transient diode are arranged to form the second protection circuit, when high-voltage surge is input to the on-off keying circuit end, the first protection circuit is used for protection, then the first resistor plays a role in voltage division and current limitation on input power, and the transient diode absorbs the input power, so that residual voltage left by the first protection circuit is restrained, and a power supply and a signal of an input system are not interfered.
Further, the device also comprises a matching circuit;
the matching circuit comprises a second capacitor and a third capacitor;
one end of the second capacitor is connected with one end of the fourth capacitor, and the other end of the second capacitor is connected with the working ground;
one end of the third capacitor is connected with the other end of the fourth capacitor, and the other end of the third capacitor is connected with the working ground.
According to the description, the second capacitor, the third capacitor and the fourth capacitor form the pi-shaped network, so that the impedance matching function is realized, the requirements of an on-off keying circuit system on impedance and return loss can be met, and the performance of the on-off keying circuit is improved.
Furthermore, the capacitance of the second capacitor is 470pF, the capacitance of the third capacitor is 820pF, and the capacitance of the fourth capacitor is 220 nF.
From the above description, the second capacitor, the third capacitor and the fourth capacitor with capacitance values of 470pF, 820pF and 220nF respectively form a pi-shaped network, so that impedance matching can be performed on 2.176MHz carrier waves, and the performance requirement of the on-off keying circuit under a special frequency band can be met.
Further, the first protection circuit comprises a gas discharge tube and a first capacitor;
one end of the gas discharge tube is connected with the output end of the on-off key controller;
the other end of the gas discharge tube is connected with a protective ground;
one end of the first capacitor is connected with the output end of the on-off key controller;
the other end of the first capacitor is connected with a protective ground.
According to the above description, the first protection circuit is formed by the first capacitor and the gas discharge tube, when the on-off keying circuit end has high-voltage surge input, the gas discharge tube forms a short circuit to the ground and provides a sufficient current-carrying channel for discharging, so that high current and high voltage from the input end can be greatly reduced, and the effect of effectively suppressing the surge is achieved.
The surge protection circuit based on-off keying input in this embodiment can be applied to an application scenario of an antenna on-off keying modulation circuit, and is described below by a specific implementation manner:
referring to fig. 1, a surge protection circuit based on-off keying input includes a first protection circuit, a second protection circuit, a bias circuit, and an on-off key controller U1;
the input end of the on-off keyer U1 is used for receiving signals; the input end of the first protection circuit is connected with the output end of the on-off keyer U1; the input end of the bias circuit is connected with the output end of the on-off keyer U1; the output end of the bias circuit is connected with the second protection circuit; namely, the input signal from the on-off keyer U1 passes through the first protection circuit, then passes through the bias circuit and finally passes through the secondary protection circuit;
referring to fig. 2, in particular, the bias circuit includes a first inductor L1 and a fourth capacitor C4; one end of the first inductor L1 is connected with the output end of the on-off keyer U1; the other end of the first inductor L1 is connected with the input end of the second protection circuit; one end of the fourth capacitor C4 is connected to the one end of the first inductor L1 and the output end of the on-off keyer U1, respectively; the other end of the fourth capacitor C4 is connected with the other end of the third capacitor C3 after a matching circuit is added;
the second protection circuit comprises a first resistor R1 and a transient diode D1; one end of the first resistor R1 is connected with the other end of the first inductor L1; the other end of the first resistor R1 is connected with one end of the transient diode D1; the other end of the transient diode D1 is connected with an operating ground;
the first protection circuit comprises a gas discharge tube G1 and a first capacitor C1; one end of the gas discharge tube G1 is connected with the output end of the on-off key controller U1; the other end of the gas discharge tube G1 is connected with a protective ground; one end of the first capacitor C1 is respectively connected with the one end of the gas discharge tube G1 and the output end of the on-off keyer U1; the other end of the first capacitor C1 is connected with a protective ground;
in an optional embodiment, further comprising a matching circuit; the matching circuit comprises a second capacitor C2 and a third capacitor C3; one end of the second capacitor C2 is connected with the one end of the fourth capacitor C4, and the other end of the second capacitor C2 is connected with an operating ground; one end of the third capacitor C3 is connected to the other end of the fourth capacitor C4, and the other end of the third capacitor C3 is operatively connected to ground; the capacitance value of the second capacitor C2 is 470pF, the capacitance value of the third capacitor C3 is 820pF, and the capacitance value of the fourth capacitor C4 is 220 nF;
the principle of the surge protection circuit based on-off keying input is as follows:
after a signal is input through the on-off keyer U1, an input surge is conducted and discharged through the gas discharge tube G1 through a primary protection circuit formed by the gas discharge tube G1 and the first capacitor C1; then, a signal passes through the bias circuit formed by the first inductor L1 and the fourth capacitor C4, an on-off keying control signal and a power supply voltage signal are separated, the control signal is input by the fourth capacitor C4, and the power supply voltage signal is input by the first inductor L1; finally, the residual surge of the primary protection is restrained through a secondary protection circuit formed by the first resistor R1 and the transient diode D1, so that the effect of effectively protecting the circuit is achieved; meanwhile, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 form a pi-shaped network to perform impedance matching on 2.176MHz carrier waves, so that the requirements of a system on impedance and return loss are met.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (6)
1. A surge protection circuit based on-off keying input is characterized by comprising a first protection circuit, a second protection circuit, a bias circuit and an on-off key controller;
the input end of the on-off keyer is used for receiving signals;
the input end of the first protection circuit is connected with the output end of the on-off key controller;
the input end of the bias circuit is connected with the output end of the on-off keyer;
the output end of the bias circuit is connected with the second protection circuit.
2. The on-off keying input-based surge protection circuit according to claim 1, wherein the bias circuit comprises a first inductor and a fourth capacitor;
one end of the first inductor is connected with the output end of the on-off key controller;
the other end of the first inductor is connected with the input end of the second protection circuit;
one end of the fourth capacitor is connected with the one end of the first inductor and the output end of the on-off key controller respectively;
the other end of the fourth capacitor is connected with the working ground.
3. The on-off keying input-based surge protection circuit according to claim 2, wherein the second protection circuit comprises a first resistor and a transient diode;
one end of the first resistor is connected with the other end of the first inductor;
the other end of the first resistor is connected with one end of the transient diode;
the other end of the transient diode is connected to the working ground.
4. The on-off keying input-based surge protection circuit according to claim 2, further comprising a matching circuit;
the matching circuit comprises a second capacitor and a third capacitor;
one end of the second capacitor is connected with one end of the fourth capacitor, and the other end of the second capacitor is connected with the working ground;
one end of the third capacitor is connected with the other end of the fourth capacitor, and the other end of the third capacitor is connected with the working ground.
5. The on-off keying input-based surge protection circuit according to claim 4, wherein a capacitance of said second capacitor is 470pF, a capacitance of said third capacitor is 820pF, and a capacitance of said fourth capacitor is 220 nF.
6. The on-off keying input-based surge protection circuit according to claim 1, wherein the first protection circuit comprises a gas discharge tube and a first capacitor;
one end of the gas discharge tube is connected with the output end of the on-off key controller;
the other end of the gas discharge tube is connected with a protective ground;
one end of the first capacitor is connected with one end of the gas discharge tube and the output end of the on-off key controller respectively;
the other end of the first capacitor is connected with a protective ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123384913.2U CN216720904U (en) | 2021-12-30 | 2021-12-30 | Surge protection circuit based on-off keying input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123384913.2U CN216720904U (en) | 2021-12-30 | 2021-12-30 | Surge protection circuit based on-off keying input |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216720904U true CN216720904U (en) | 2022-06-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123384913.2U Active CN216720904U (en) | 2021-12-30 | 2021-12-30 | Surge protection circuit based on-off keying input |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216720904U (en) |
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2021
- 2021-12-30 CN CN202123384913.2U patent/CN216720904U/en active Active
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