Power amplifier transistor power-on / off timing protection circuit and control method

Abstract

The application discloses a power amplifier tube power-on and power-off timing protection circuit and a control method. The protection circuit comprises a voltage reduction module, a negative voltage power supply module, a signal acquisition module, a switch and a controller. The voltage reduction module is used for reducing an external power supply voltage to a target voltage. The negative voltage power supply module is used for providing a gate voltage for the power amplifier tube. The signal acquisition module is used for acquiring a power supply signal of the external power supply and a gate voltage signal of the gate voltage of the power amplifier tube. The switch is used for controlling the on-off of a drain power supply of the power amplifier tube. The controller is used for controlling the on-off of the switch according to the power supply signal and / or the gate voltage signal. The anti-reverse discharge module is used for preventing the reverse discharge of the power supply in the case of external power supply abnormality or power-off. The application can effectively avoid the damage of the power amplifier tube caused by the power-on and power-off sequence error or the power supply module fault.

Description

Technical Field

[0001] This invention relates to the field of power amplifier technology, and in particular to a power amplifier tube power-on / off timing protection circuit and control method. Background Technology

[0002] In modern high-frequency, high-power applications, power amplifier transistors (such as gallium nitride, aluminum nitride, silicon nitride, and other high-voltage transistors) are core components widely used in radio frequency, microwave communications, and power electronics. These transistors have strict requirements on the power-on and power-off sequence of their gate and drain voltages. Incorrect power-on / off timing can damage the transistors, affecting the stability and reliability of the system. Especially in high-power applications, improper power-on / off timing can often lead to the failure or serious damage of the entire power amplifier system, resulting in significant economic losses.

[0003] While existing technologies offer some protection circuits, most solutions suffer from reliance on a single power supply or insufficient fault redundancy. Current protection circuits largely depend on simple control of gate and leakage voltages, failing to provide adequate redundancy and protection, especially when multiple power amplifiers are used in parallel, thus failing to effectively prevent cascading effects caused by a single fault. Therefore, there is an urgent need for a power amplifier transistor power-on / off sequence protection circuit that meets high reliability requirements. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a power amplifier tube power-on / off timing protection circuit and control method, which can effectively avoid damage to the power amplifier tube caused by incorrect power-on / off sequence or power supply module failure.

[0005] The technical solution of the present invention provides a power amplifier transistor power-on / off timing protection circuit, comprising:

[0006] A step-down module is used to reduce the external power supply voltage to a target voltage.

[0007] A negative voltage power supply module, one end of which is electrically connected to the step-down module and the other end of which is electrically connected to the power amplifier tube, is used to provide the gate voltage to the power amplifier tube;

[0008] The signal acquisition module is used to acquire the power signal of the external power supply and the gate voltage signal of the power amplifier tube.

[0009] A switch, one end of which is electrically connected to the external power supply, and the other end of which is electrically connected to the drain of the power amplifier tube, for controlling the on / off state of the drain power supply of the power amplifier tube;

[0010] A controller for controlling the on / off state of the switch based on the power supply signal and / or the gate voltage signal;

[0011] A reverse discharge prevention module is provided, with one end electrically connected to the step-down module and the other end electrically connected to the negative voltage power supply module, the signal acquisition module, and the controller, respectively, to prevent reverse discharge of the power supply in the event of an abnormality or power failure of the external power supply.

[0012] In one of the alternative technical solutions, the reverse discharge protection module includes a first diode and a first capacitor. The positive terminal of the first diode is electrically connected to the step-down module, the negative terminal of the first diode is electrically connected to one end of the first capacitor, and the other end of the first capacitor is grounded.

[0013] In one of the alternative technical solutions, the negative voltage power supply module includes a first negative voltage power supply unit, a second negative voltage power supply unit, a second diode, a third diode, and a second capacitor. The first negative voltage power supply unit and the second negative voltage power supply unit are connected in parallel through the second diode, the third diode, and the second capacitor, so that the first negative voltage power supply unit and the second negative voltage power supply unit serve as backups for each other.

[0014] In one of the alternative technical solutions, the number of power amplifier tubes is multiple, the gates of the multiple power amplifier tubes are electrically connected to the negative voltage power supply module, and the drains of the multiple power amplifier tubes are electrically connected to the switch.

[0015] In one of the alternative technical solutions, an overcurrent protection module is also included. The gate of each power amplifier tube is electrically connected to the negative voltage power supply module through the overcurrent protection module, which is used to disconnect the power amplifier tube when one of the power amplifier tubes fails.

[0016] In one of the alternative technical solutions, the overcurrent protection module includes a current-limiting resistor and a fuse, and the gate of each power amplifier tube is electrically connected to the negative voltage power supply module through the current-limiting resistor and the fuse.

[0017] In one of the alternative technical solutions, the switch is a contactor.

[0018] In one of the alternative technical solutions, the power amplifier tube includes one or more of gallium nitride power amplifier tubes, aluminum nitride power amplifier tubes, silicon nitride power amplifier tubes, and high-power field-effect power amplifier tubes.

[0019] The technical solution of the present invention also provides a control method for the power-on / off timing protection circuit of the power amplifier tube as described in any of the preceding claims, characterized in that it includes:

[0020] Real-time detection of the power supply signal from the external power source and the gate voltage signal of the power amplifier transistor;

[0021] The switching on and off is controlled according to the power supply signal and the gate voltage signal.

[0022] In one alternative technical solution, controlling the switching on and off based on the power supply signal and the gate voltage signal includes:

[0023] If the power supply signal and the gate voltage signal are normal, control the switch to connect;

[0024] If the power supply signal and / or the gate voltage signal are abnormal, the switch is controlled to open.

[0025] The above technical solution offers the following advantages: Through a step-down module, a negative voltage power supply module, a signal acquisition module, a switch, a controller, and a reverse discharge protection module, the signal acquisition module monitors the power supply signal from the external power source and the gate voltage signal of the power amplifier tube in real time. The controller controls the switching on and off based on the received power supply signal and / or gate voltage signal. When both the power supply signal and the gate voltage signal are normal, the control switch closes, providing a stable leakage power supply to the power amplifier tube. In this way, the gate voltage is ensured to power on before the leakage voltage. When the power supply signal detects an external power outage, the control switch opens, cutting off the leakage power supply to the power amplifier tube, ensuring that the gate voltage is de-energized before the leakage voltage. Furthermore, in the event of an external power outage, the reverse discharge protection module provides temporary energy storage, allowing the control circuit to continue operating, effectively preventing damage to the power amplifier tube due to incorrect power-on / off sequence or power supply module failure. Attached Figure Description

[0026] The disclosure of this invention will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings:

[0027] Figure 1 This is a schematic diagram of a power amplifier tube power-on / off timing protection circuit according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the power amplifier tube power-on / off timing protection circuit in one embodiment of the present invention;

[0029] Figure 3 The present invention provides a flowchart of a control method for a power amplifier tube power-on / off timing protection circuit as described in any of the preceding claims, according to an embodiment of the present invention. Detailed Implementation

[0030] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0031] It is readily understood that, based on the technical solution of this invention, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of the invention.

[0032] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0033] like Figure 1 As shown, an embodiment of the present invention provides a power amplifier transistor power-on / off timing protection circuit 10, comprising:

[0034] Step-down module 11 is used to reduce the voltage of external power supply 20 to the target voltage;

[0035] A negative voltage power supply module 12, one end of which is electrically connected to the step-down module 11, and the other end of which is electrically connected to the power amplifier tube 30, is used to provide the gate voltage for the power amplifier tube 30;

[0036] The signal acquisition module 13 is used to acquire the power signal of the external power supply 20 and the gate voltage signal of the gate voltage of the power amplifier tube 30;

[0037] Switch 14, one end of which is electrically connected to the external power supply 20, and the other end of which is electrically connected to the drain of the power amplifier tube 30, for controlling the on / off of the drain power supply of the power amplifier tube 30;

[0038] Controller 15 is used to control the on / off state of switch 14 according to the power supply signal and / or the gate voltage signal;

[0039] The reverse discharge prevention module 16 is provided, with one end electrically connected to the step-down module 11 and the other end electrically connected to the negative voltage power supply module 12, the signal acquisition module 13, and the controller 15, respectively, to prevent reverse discharge of the power supply in the event of abnormality or power failure of the external power supply 20.

[0040] The power amplifier tube power-on / off timing protection circuit of the present invention can be applied to high-power radio frequency amplification systems to prevent power amplifier tubes from being damaged due to incorrect power-on / off sequence or power supply module failure.

[0041] The power amplifier tube power-on / off timing protection circuit 10 provided in this embodiment mainly includes a step-down module 11, a negative voltage power supply module 12, a signal acquisition module 13, a switch 14, a controller 15, and a reverse discharge protection module 16.

[0042] The step-down module 11 is electrically connected to the external power supply 20 and is used to reduce the voltage of the external power supply 20 to the target voltage. The structure and working principle of the step-down module 11 can be implemented using existing step-down modules, and will not be described in detail here. The target voltage can be set according to user requirements.

[0043] The input terminal of the negative voltage power supply module 12 is electrically connected to the step-down module 11, and the output terminal of the negative voltage power supply module 12 is electrically connected to the power amplifier tube 30. The negative voltage power supply module 12 is used to convert the positive voltage of the step-down module 11 into a negative voltage to power the gate of the power amplifier tube 30. The structure and working principle of the negative voltage power supply module 12 can be implemented using existing step-down modules, and will not be described in detail here.

[0044] The signal acquisition module 13 is used to acquire the power signal of the external power supply 20 and the gate voltage signal of the power amplifier tube 30. The signal acquisition module 13 can obtain the power signal of the external power supply 20 by acquiring the voltage signal at the output terminal of the buck module 11. The signal acquisition module 13 can use a voltage sensor to acquire the power signal and the gate voltage signal.

[0045] Switch 14 can be a high-load-capacity switching device. Switch 14 is used to control the switching of the drain power supply of power amplifier tube 30 and automatically disconnect the drain voltage power supply of power amplifier tube 30 when the control circuit is abnormal or the external power supply fails. Switch 14 includes contactors, metal-oxide-semiconductor transistors (MOSFETs), solid-state relays and other devices with the same function and load capacity.

[0046] The controller 15 is communicatively connected to the signal acquisition module 13 and the switch 14. After receiving the power signal and / or grid voltage signal, the controller 15 determines whether the power signal and / or grid voltage signal are normal. Power-on sequence: When the external power supply 20 is connected, the controller first confirms the status of the grid voltage and drain voltage. When both the grid voltage signal and the power signal are normal, the controller switch 14 closes to provide a stable drain voltage power supply to the power amplifier tube 30. In this way, the grid voltage is ensured to power on before the drain voltage. Power-off sequence: After detecting the power failure of the external power supply 20 through the power signal, the controller controls the switch 14 to open, cutting off the drain voltage power supply to the power amplifier tube 30, ensuring that the grid voltage is de-energized before the drain voltage. The following situations are considered abnormal for the power signal and / or grid voltage signal:

[0047] 1) External power supply 20 is interrupted or fails;

[0048] 2) Failure of the grid voltage power supply section or abnormal voltage;

[0049] 3) Negative voltage power supply module 12 is faulty;

[0050] 4) The power-on / off sequence of the grid voltage and drain voltage is incorrect;

[0051] 5) Abnormal load current or overload;

[0052] 6) The circuit temperature exceeds the safe range;

[0053] 7) Short circuit or other faults.

[0054] The reverse discharge protection module 16 is located after the step-down module 11. In the event of an abnormality or power failure of the external power supply 20, the reverse discharge protection module 16 provides temporary energy storage, allowing the control circuit to continue operating and further ensuring that the gate voltage of the power amplifier tube 30 drops before the drain voltage. The reverse discharge protection module 16 can be composed of devices such as a supercapacitor, a Schottky diode, a voltage clamping diode, a gas discharge tube, and a transient voltage suppression diode.

[0055] In this embodiment, a step-down module, a negative voltage power supply module, a signal acquisition module, a switch, a controller, and a reverse discharge protection module are used. The signal acquisition module monitors the power supply signal from the external power source and the gate voltage signal of the power amplifier tube in real time. The controller controls the switching on and off based on the received power supply signal and / or gate voltage signal. When both the power supply signal and the gate voltage signal are normal, the control switch closes, providing a stable leakage power supply to the power amplifier tube. In this way, it is ensured that the gate voltage is powered on before the leakage voltage. When the power supply signal detects that the external power source is de-energized, the control switch opens, cutting off the leakage power supply to the power amplifier tube, ensuring that the gate voltage is de-energized before the leakage voltage. Furthermore, in the event of an external power failure, the reverse discharge protection module provides temporary energy storage, allowing the control circuit to continue operating. This effectively prevents damage to the power amplifier tube caused by incorrect power-on / off sequence or power supply module failure.

[0056] In one embodiment, such as Figure 2 As shown, the reverse discharge protection module 16 includes a first diode D1 and a first capacitor C1. The positive terminal of the first diode D1 is electrically connected to the step-down module 11, the negative terminal of the first diode D1 is electrically connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded.

[0057] The reverse discharge protection module 16 includes a first diode D1 and a first capacitor C1. The positive terminal of the first diode D1 is electrically connected to the output terminal of the step-down module 11, and the negative terminal of the first diode D1 is electrically connected to one end of the first capacitor C1, the negative voltage power supply module 12, the signal acquisition module 13, and the input terminal of the controller 15. The other end of the first capacitor C1 is grounded. When the external power supply 20 is de-energized, the first diode D1 and the first capacitor C1 can store energy, enabling the negative voltage power supply module 12 and the controller 15 to continue working, thus preventing damage to the power amplifier tube 30 caused by the de-energization of the external power supply 20.

[0058] In one embodiment, such as Figure 2 As shown, the negative voltage power supply module 12 includes a first negative voltage power supply unit 121, a second negative voltage power supply unit 122, a second diode D2, a third diode D3, and a second capacitor C2. The two first negative voltage power supply units 121 and the second negative voltage power supply unit 122 are connected in parallel through the second diode D2, the third diode D3, and the second capacitor C2, so that the first negative voltage power supply unit 121 and the second negative voltage power supply unit 122 serve as backups for each other.

[0059] The input terminals of the first negative voltage power supply unit 121 and the second negative voltage power supply unit 122 are electrically connected to the negative terminal of the first diode D1. The output terminal of the first negative voltage power supply unit 121 is electrically connected to the positive terminal of the second diode D2. The output terminal of the second negative voltage power supply unit 122 is electrically connected to the positive terminal of the third diode D3. The negative terminals of the second diode D2 and the third diode D3 are electrically connected to one end of the second capacitor C2. The other end of the second capacitor C2 is grounded, so that the first negative voltage power supply unit 121 and the second negative voltage power supply unit 122 are connected in parallel to form a negative voltage power supply module that serves as a backup for each other. This increases the redundancy and fault tolerance of the circuit. When any one of the negative voltage power supplies fails, the other can start immediately, thereby ensuring a stable grid voltage power supply for the power amplifier tube 30 and preventing the grid voltage of the entire power amplifier tube 30 from being incorrect due to a fault in a single negative voltage power supply circuit, which could lead to damage to the power amplifier tube 30.

[0060] In one embodiment, such as Figure 2 As shown, there are multiple power amplifier tubes 30, the gates of the multiple power amplifier tubes 30 are electrically connected to the negative voltage power supply module 12, and the drains of the multiple power amplifier tubes 30 are electrically connected to the switch 14.

[0061] When the number of power amplifier tubes 30 is multiple (e.g.) Figure 2When power amplifier tubes 1 to n are shown, the power amplifier tube power-on / off timing protection circuit of the present invention can also be used to protect the power-on / off timing. It is only necessary to electrically connect the gates of multiple power amplifier tubes 30 to the negative voltage power supply module 12 and the drains of multiple power amplifier tubes 30 to the switch 14 to form a parallel connection of multiple power amplifier tubes 30, so as to simultaneously protect the power-on / off timing of multiple power amplifier tubes 30 and avoid damage to the power amplifier tubes due to incorrect power-on / off sequence or power supply module failure.

[0062] In one embodiment, such as Figure 2 As shown, it also includes an overcurrent protection module 17, through which the gate of each of the power amplifier tubes 30 is electrically connected to the negative voltage power supply module 12, for disconnection when one of the power amplifier tubes 30 fails.

[0063] The overcurrent protection module 17 is set between the gate of each power amplifier tube 30 and the negative voltage power supply module 12 to form a fault isolation circuit. When one of the power amplifier tubes 30 fails (such as a gate short circuit), the overcurrent protection module 17 cuts off the power supply to the faulty power amplifier tube, reduces the impact on other power amplifier tubes, prevents the fault from spreading to other power amplifier tubes, and avoids triggering a chain failure.

[0064] In one embodiment, such as Figure 2 As shown, the overcurrent protection module 17 includes a current-limiting resistor F1 and a fuse R1. The gate of each power amplifier tube 30 is electrically connected to the negative voltage power supply module 12 through the current-limiting resistor F1 and the fuse R1.

[0065] The overcurrent protection module 17 includes a current-limiting resistor F1 and a fuse R1. One end of the current-limiting resistor F1 is electrically connected to the gate of the power amplifier tube 30, and the other end of the current-limiting resistor F1 is electrically connected to one end of the fuse R1. The other end of the fuse R1 is electrically connected to the negative voltage power supply module 12, so that each power amplifier tube 30 is connected in series with the current-limiting resistor F1 and the fuse R1 to form an isolation circuit. When one of the power amplifier tubes 30 fails, the current-limiting resistor F1 and the fuse R1 quickly melt, cutting off the gate power supply of the power amplifier tube, reducing the impact on other power amplifier tubes, preventing the fault from spreading to other power amplifier tubes, and avoiding cascading failures.

[0066] In one embodiment, the switch 14 is a contactor.

[0067] The contactor is normally open and can be designed with low internal resistance (e.g., below 0.1mΩ) and high current carrying capacity. Its contact resistance allows it to withstand surge voltages of up to hundreds of volts and surge currents of thousands of amperes, ensuring a reliable leakage power supply when the multi-channel power amplifier tube 30 is operating. Simultaneously, its low internal resistance allows it to operate normally even with large currents and generates relatively little heat.

[0068] In one embodiment, the power amplifier tube 30 includes one or more of gallium nitride power amplifier tubes, aluminum nitride power amplifier tubes, silicon nitride power amplifier tubes, and high-power field-effect power amplifier tubes.

[0069] like Figure 3 As shown, an embodiment of the present invention provides a control method for a power amplifier transistor power-on / off timing protection circuit as described in any of the preceding claims, comprising:

[0070] Step S301: Real-time detection of the power supply signal of the external power supply and the gate voltage signal of the power amplifier tube;

[0071] Step S302: Control the switching on and off according to the power signal and the gate voltage signal.

[0072] Specifically, in step S301, the controller uses the signal acquisition unit to detect the power supply signal from the external power source and the gate voltage signal of the power amplifier transistor in real time. Then, it executes step S302 to determine if the power supply signal and / or gate voltage signal are normal. Power-on sequence: When the external power source is connected, the controller first confirms the status of the gate voltage and drain voltage. Once both the gate voltage signal and the power supply signal are normal, the control switch closes to provide a stable drain voltage power supply to the power amplifier transistor. This ensures that the gate voltage powers on before the drain voltage. Power-off sequence: After detecting the power failure of the external power source through the power signal, the controller controls the switch to open, cutting off the drain voltage power supply to the power amplifier transistor, ensuring that the gate voltage powers off before the drain voltage. The following situations are considered abnormal for the power supply signal and / or gate voltage signal:

[0073] 1) External power supply 20 is interrupted or fails;

[0074] 2) Failure of the grid voltage power supply section or abnormal voltage;

[0075] 3) Negative voltage power supply module 12 is faulty;

[0076] 4) The power-on / off sequence of the grid voltage and drain voltage is incorrect;

[0077] 5) Abnormal load current or overload;

[0078] 6) The circuit temperature exceeds the safe range;

[0079] 7) Short circuit or other faults.

[0080] In this embodiment, the power supply signal of the external power supply and the gate voltage signal of the power amplifier tube are detected in real time. The switching on and off of the switch is controlled according to the power supply signal and the gate voltage signal, thereby controlling the drain power supply of the power amplifier tube. This ensures that the gate voltage is powered on before the drain voltage and powered off before the drain voltage, effectively avoiding damage to the power amplifier tube caused by incorrect power-on / off sequence or power supply module failure.

[0081] In one embodiment, step S302 includes:

[0082] If the power supply signal and the gate voltage signal are normal, control the switch to connect;

[0083] If the power supply signal and / or the gate voltage signal are abnormal, the switch is controlled to open.

[0084] Specifically, when the controller receives a power signal and / or a grid voltage signal, it determines whether the power signal and / or grid voltage signal are normal. If both the power signal and the grid voltage signal are normal when powered on, the control switch is turned on to supply power to the drain of the power amplifier tube, ensuring that the grid voltage is powered on before the drain voltage. If the power signal and / or the grid voltage signal are abnormal, the control switch is turned off to cut off the drain voltage power supply of the power amplifier tube, ensuring that the grid voltage is powered off before the drain voltage.

[0085] The above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them. Although the embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power amplifier tube power-on and power-off timing protection circuit, characterized in that, The application relates to a power amplifier, which comprises the following parts: a voltage reduction module for reducing the voltage of an external power supply to a target voltage; a negative voltage supply module, one end of which is electrically connected with the voltage reduction module, and the other end of which is electrically connected with a power amplifier tube for providing a gate voltage for the power amplifier tube, the power amplifier tube being in plurality, the gates of the power amplifier tubes being electrically connected with the negative voltage supply module, and the drains of the power amplifier tubes being electrically connected with a switch; a signal acquisition module for acquiring a power signal of the external power supply and a gate voltage signal of the gate voltage of the power amplifier tube; the switch, one end of which is electrically connected with the external power supply, and the other end of which is electrically connected with the drain of the power amplifier tube, for controlling the on-off of the drain power supply of the power amplifier tube; a controller for controlling the on-off of the switch according to the power signal and / or the gate voltage signal; a reverse discharge prevention module, one end of which is electrically connected with the voltage reduction module, and the other end of which is electrically connected with the negative voltage supply module, the signal acquisition module and the controller respectively, for preventing the reverse discharge of the external power supply under the condition of abnormality or power-off of the external power supply; an overcurrent protection module, the gate of each power amplifier tube being electrically connected with the negative voltage supply module through the overcurrent protection module, for being disconnected when one of the power amplifier tubes is faulty.

2. The power amplifier on-off timing protection circuit according to claim 1, wherein, The reverse discharge prevention module comprises a first diode and a first capacitor, the anode of the first diode being electrically connected with the voltage reduction module, the cathode of the first diode being electrically connected with one end of the first capacitor, and the other end of the first capacitor being grounded.

3. The power amplifier on-off timing protection circuit of claim 1, wherein, The negative voltage supply module comprises a first negative voltage supply unit, a second negative voltage supply unit, a second diode, a third diode and a second capacitor, the first negative voltage supply unit and the second negative voltage supply unit being connected in parallel through the second diode, the third diode and the second capacitor, so that the first negative voltage supply unit and the second negative voltage supply unit are backup for each other.

4. The power amplifier on-off timing protection circuit of claim 1, wherein, The overcurrent protection module comprises a current-limiting resistor and a fuse, the gate of each power amplifier tube being electrically connected with the negative voltage supply module through the current-limiting resistor and the fuse.

5. The power amplifier on-off timing protection circuit of claim 1, wherein, The switch is a contactor.

6. The power amplifier on-off timing protection circuit of claim 1, wherein, The power amplifier tube comprises one or more of a gallium nitride power amplifier tube, an aluminum nitride power amplifier tube, a silicon nitride power amplifier tube and a high-power field effect power amplifier tube.

7. A method of controlling the on-off timing protection circuit of a power amplifier tube as claimed in any one of claims 1-6, characterized in that The application relates to a power amplifier, which comprises the following parts: real-time detection of a power signal of an external power supply and a gate voltage signal of a gate voltage of a power amplifier tube; control of the on-off of a switch according to the power signal and the gate voltage signal.

8. The control method according to claim 7, characterized by, The control of the on-off of the switch according to the power signal and the gate voltage signal comprises: if the power signal and the gate voltage signal are normal, the switch is controlled to be connected; if the power signal and / or the gate voltage signal is abnormal, the switch is controlled to be disconnected.

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