Radio frequency power amplifier protection circuit and method and radio frequency power supply system

Abstract

The invention provides a radio frequency power amplifier protection circuit, a radio frequency power amplifier protection method and a radio frequency power supply system. The radio frequency power amplifier protection circuit comprises a first protection unit, a first switching unit, a second switching unit and a control unit, the first protection unit and the first switching unit are used for being sequentially connected between a power supply unit and a radio frequency power amplifier unit, and the control unit is connected with the first switching unit, the second switching unit and the radio frequency power amplifier unit. The second switching unit is connected to two ends of the first protection unit. Wherein the control unit is used for acquiring the working state of the radio frequency power amplifier unit, controlling the first switching unit to be switched to the on state or the off state according to the working state of the radio frequency power amplifier unit, and controlling the second switching unit to be switched to the on state or the off state after a preset time period, and the first switching unit and the second switching unit are both in an on state or an off state. According to the invention, effective short-circuit protection can be carried out on the radio frequency power amplifier unit.

Description

Technical Field

[0001] The present application relates to the field of radio frequency technology, and in particular to a radio frequency power amplifier protection circuit, method, and radio frequency power supply system. Background Art

[0002] The development and widespread application of RF power technology are placing increasingly stringent demands on RF power systems. While outputting RF power, the RF power amplifier (PA) unit (PU) of an RF power system may experience abnormal conditions such as short circuits, disconnections, and overheating. Short circuits pose a significant threat to the PU. Existing short-circuit protection for RF PAs fails to consider the PU's operating environment, making it difficult to provide effective short-circuit protection. Therefore, effective short-circuit protection for RF PAs has become a critical issue. Summary of the Invention

[0003] The present application provides a radio frequency power amplifier protection circuit, method and radio frequency power supply system, which can effectively provide short-circuit protection for the radio frequency power amplifier unit, thereby avoiding the risk of high voltage when short-circuiting the radio frequency power amplifier unit.

[0004] In a first aspect, a radio frequency power amplifier protection circuit is provided, the radio frequency power amplifier protection circuit comprising a first protection unit, a first switching unit, a second switching unit, and a control unit, wherein the first protection unit and the first switching unit are connected in sequence between a power supply unit and a radio frequency power amplifier unit, the control unit is connected to the first switching unit, the second switching unit, and the radio frequency power amplifier unit, the second switching unit is connected to both ends of the first protection unit, and the first protection unit has a first inductance value. The first switching unit is configured to be in an on state or an off state to correspondingly open or close a connection path of a branch in which the first switching unit is located, the second switching unit is configured to be in an on state or an off state to correspondingly open or close a connection path of a branch in which the second switching unit is located, the control unit is configured to obtain an operating state of the radio frequency power amplifier unit, control the second switching unit to switch to an on state or an off state according to the operating state of the radio frequency power amplifier unit, and control the first switching unit to switch to an on state or an off state after a preset period of time, wherein during the preset period of time, the first switching unit and the second switching unit are both in an on state or in an off state.

[0005] In one possible embodiment, the working state of the RF power amplifier unit includes a short-circuit state and a short-circuit elimination state, and the control unit is used to control the second switching unit to switch from the off state to the on state when the RF power amplifier unit is in the short-circuit state, and control the first switching unit to remain in the on state, and control the first switching unit to switch from the on state to the off state after the preset time period, and control the second switching unit to switch from the on state to the off state after the RF power amplifier unit changes from the short-circuit state to the short-circuit elimination state, and control the first switching unit to switch from the off state to the on state after the preset time period.

[0006] In one possible implementation, the first protection unit includes a first choke having the first inductance value, and the first inductance value is greater than a first threshold value. The first switching unit includes a first switch, and the second switching unit includes a second switch. The first switch and the second switch are configured to be closed or opened, respectively, to respectively connect or disconnect the connection path of the branch where the first switching unit and the second switching unit are located. The control unit is configured to control the first switch and the second switch to be closed or opened, respectively, to respectively control the first switching unit and the second switching unit to switch to an on state or an off state.

[0007] In one possible embodiment, the power supply unit includes a positive power supply electrode and a negative power supply electrode, and the RF power amplifier unit includes a positive input terminal and a negative input terminal. The first protection unit includes a first protection module and a second protection module, the first switching unit includes a first switching module and a second switching module, and the second switching unit includes a third switching module and a fourth switching module. The first protection module and the first switching module are sequentially connected between the positive power supply electrode and the positive input terminal, the second protection module and the second switching module are sequentially connected between the negative power supply electrode and the negative input terminal, the third switching module is connected to both ends of the first protection module, and the fourth switching module is connected to both ends of the second protection module. The first protection module and the second protection module both have the first inductance value. In which, the first switching module and the second switching module are synchronously in the on state or the off state, so that the first switching unit is correspondingly in the on state or the off state, and the third switching module and the fourth switching module are synchronously in the on state or the off state, so that the second switching unit is correspondingly in the on state or the off state, and the control unit is used to synchronously control the first switching module and the second switching module to switch to the on state or the off state, so as to correspondingly control the first switching unit to switch to the on state or the off state, and to synchronously control the third switching module and the fourth switching module to switch to the on state or the off state, so as to correspondingly control the second switching unit to switch to the on state or the off state.

[0008] In one possible implementation, the first protection module includes a second choke, the second protection module includes a third choke, the second choke and the third choke both have the first inductance value, and the first inductance value is greater than a first threshold value. The first switching module includes a third switch, the second switching module includes a fourth switch, the third switching module includes a fifth switch, and the fourth switching module includes a sixth switch. The third switch, the fourth switch, the fifth switch, and the sixth switch are respectively configured to be closed or opened to respectively switch the first switching module, the second switching module, the third switching module, and the fourth switching module on or off. The control unit is configured to synchronously control the third switch and the fourth switch to be closed or opened to respectively control the first switching module and the second switching module to be synchronously switched to the on state or the off state, and to synchronously control the fifth switch and the sixth switch to be closed or opened to respectively control the third switching module and the fourth switching module to be synchronously switched to the on state or the off state.

[0009] In a possible embodiment, the RF power amplifier protection circuit also includes a second protection unit, one end of the second protection unit is connected to the connection point between the first switching module and the positive input terminal, the other end of the second protection unit is connected to the connection point between the second switching module and the negative input terminal, and the second protection unit has a first capacitance value.

[0010] In a second aspect, a radio frequency power amplifier protection method is provided, which is applied to the aforementioned radio frequency power amplifier protection circuit. The radio frequency power amplifier protection method includes: obtaining an operating state of the radio frequency power amplifier unit; controlling the second switching unit to switch to an on state or an off state based on the operating state of the radio frequency power amplifier unit; and controlling the first switching unit to switch to an on state or an off state after a preset period of time.

[0011] In one possible embodiment, the operating state of the RF power amplifier unit includes a short-circuit state and a short-circuit elimination state. Controlling the second switching unit to switch to an on state or an off state based on the operating state of the RF power amplifier unit includes: controlling the second switching unit to switch from an off state to an on state when the RF power amplifier unit is in a short-circuit state, and controlling the first switching unit to remain in an on state. Controlling the first switching unit to switch to an on state or an off state after a preset period of time includes: controlling the first switching unit to switch from an on state to an off state after a preset period of time.

[0012] In one possible embodiment, the operating state of the RF power amplifier unit includes a short-circuit state and a short-circuit-eliminating state. Controlling the second switching unit to switch to an on state or an off state based on the operating state of the RF power amplifier unit includes: controlling the second switching unit to switch from an on state to an off state after the RF power amplifier unit changes from a short-circuit state to a short-circuit-eliminating state. Controlling the first switching unit to switch to an on state or an off state after a preset period of time includes: controlling the first switching unit to switch from an off state to an on state after a preset period of time.

[0013] In a third aspect, a radio frequency power supply system is also provided, comprising a power supply unit, a radio frequency power amplifier unit, and a radio frequency power amplifier protection circuit. The radio frequency power amplifier protection circuit comprises a first protection unit, a first switching unit, a second switching unit, and a control unit. The first protection unit and the first switching unit are sequentially connected between the power supply unit and the radio frequency power amplifier unit. The control unit is connected to the first switching unit, the second switching unit, and the radio frequency power amplifier unit. The second switching unit is connected to both ends of the first protection unit, and the first protection unit has a first inductance value. The first switching unit is configured to be in an on state or an off state to correspondingly open or close the connection path of the branch in which the first switching unit is located. The second switching unit is configured to be in an on state or an off state to correspondingly open or close the connection path of the branch in which the second switching unit is located. The control unit is configured to obtain the operating state of the radio frequency power amplifier unit, control the second switching unit to switch to an on state or an off state according to the operating state of the radio frequency power amplifier unit, and control the first switching unit to switch to an on state or an off state after a preset period of time. During the preset period of time, the first switching unit and the second switching unit are both in an on state or in an off state.

[0014] The RF power amplifier protection circuit, method and RF power supply system of the present application are configured to cooperate with a first switching unit and a second switching unit in conjunction with a first protection unit, and then configured to control the second switching unit to switch to an on state or an off state according to the working state of the RF power amplifier unit, and control the first switching unit to switch to an on state or an off state after a preset time period. In the preset time period, the first switching unit and the second switching unit are both in an on state or both in an off state, which can not only provide short-circuit protection for the RF power amplifier unit, but also avoid the risk of high voltage when the RF power amplifier unit is short-circuited. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0016] Figure 1 This is a block diagram of a radio frequency power amplifier protection circuit in some embodiments of the present application.

[0017] Figure 2 This is a circuit diagram of a radio frequency power amplifier protection circuit in some embodiments of the present application.

[0018] Figure 3 This is another block diagram of the radio frequency power amplifier protection circuit in some embodiments of the present application.

[0019] Figure 4This is another circuit diagram of the radio frequency power amplifier protection circuit in some embodiments of the present application.

[0020] Figure 5 Schematic diagram of the steps of the radio frequency power amplifier protection method in some embodiments of the present application.

[0021] Figure 6 This is a schematic diagram of another step of the radio frequency power amplifier protection method in some embodiments of the present application.

[0022] Figure 7 This is a schematic diagram of another step of the radio frequency power amplifier protection method in some embodiments of the present application.

[0023] Figure 8 This is a block diagram of a radio frequency power supply system in some embodiments of the present application.

[0024] Explanation of the accompanying drawings: 1000, RF power supply system, DC, power supply unit, PA, RF power amplifier unit, 10, RF power amplifier protection circuit, 100, first protection unit, L1, first choke, 110, first protection module, L2, second choke, 120, second protection module, L3, third choke, 200, first switching unit, S1, first switch, 210, first switching module, S3, third switch, 220, second switching module, S4, fourth switch, 300, second switching unit, S2, second switch, 310, third switching module, S5, fifth switch, 320, fourth switching module, S6, sixth switch, 400, control unit, 500, second protection unit. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0027] In the following, the terms "first," "second," "third," "fourth," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first," "second," "third," "fourth," etc. may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

[0028] In describing the embodiments of the present application, it should be noted that the terms "first," "second," "third," "fourth," etc. in the specification and claims of the present application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0029] In addition, the terms "including" and "having" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product or device.

[0030] See also Figure 1 , Figure 1 FIG. 1 is a block diagram of a radio frequency power amplifier protection circuit in some embodiments of the present application. Figure 1As shown, the present application provides a radio frequency power amplifier protection circuit 10, which includes a first protection unit 100, a first switching unit 200, a second switching unit 300 and a control unit 400. The first protection unit 100 and the first switching unit 200 are used to be connected between the power supply unit DC and the radio frequency power amplifier unit PA in sequence. The control unit 400 is connected to the first switching unit 200, the second switching unit 300 and the radio frequency power amplifier unit PA. The second switching unit 300 is connected to both ends of the first protection unit 100, and the first protection unit 100 has a first inductance value. Among them, the first switching unit 200 is used to be in an on state or an off state to correspondingly turn on or off the connection path of the branch where the first switching unit 200 is located, and the second switching unit 300 is used to be in an on state or an off state to correspondingly turn on or off the connection path of the branch where the second switching unit 300 is located. The control unit 400 is used to obtain the working state of the RF power amplifier unit PA, control the second switching unit 300 to switch to an on state or an off state according to the working state of the RF power amplifier unit PA, and control the first switching unit 200 to switch to an on state or an off state after a preset time period, wherein in the preset time period, the first switching unit 200 and the second switching unit 300 are both in an on state or both in an off state.

[0031] Therefore, the above-mentioned RF power amplifier protection circuit 10 in the present application is configured to control the second switching unit 300 to switch to the on state or the off state according to the working state of the RF power amplifier unit PA by setting the first switching unit 200 and the second switching unit 300 to cooperate with the first protection unit 100, and then control the first switching unit 200 to switch to the on state or the off state after a preset time period, and in the preset time period, the first switching unit 200 and the second switching unit 300 are both in the on state or both in the off state, which can not only cooperate with the first protection unit 100 to perform short-circuit protection on the RF power amplifier unit PA, but also avoid the high voltage risk of the first protection unit 100 when the RF power amplifier unit PA is short-circuited, thereby avoiding damage to the first protection unit 100 and resulting in the inability to effectively protect the RF power amplifier unit PA.

[0032] The preset time period may be a period between the switching of the second switching unit 300 and the switching of the first switching unit 200. The preset time period may be set according to specific needs. In some embodiments, the power supply unit DC may be used to provide direct current power to the radio frequency power amplifier unit PA, and the radio frequency power amplifier unit PA may be used to generate radio frequency power based on the direct current.

[0033] In some embodiments, the working state of the radio frequency power amplifier unit PA includes a short-circuit state and a short-circuit exclusion state, the control unit 400 is configured to control the second switching unit 300 to switch from the off state to the on state when the radio frequency power amplifier unit PA is in the short-circuit state, and control the first switching unit 200 to remain in the on state, and after a preset time period, control the first switching unit 200 to switch from the on state to the off state, and after the radio frequency power amplifier unit PA changes from the short-circuit state to the short-circuit exclusion state, control the second switching unit 300 to switch from the on state to the off state, and after a preset time period, control the first switching unit 200 to switch from the off state to the on state.

[0034] In the normal working state of the radio frequency power amplifier unit PA, the first protection unit 100 is mainly used for corresponding abnormal protection, such as short-circuit protection.

[0035] Therefore, the radio frequency power amplifier protection circuit 10 in the present application can avoid the high voltage generated by the first protection unit 100 due to the sudden change of current between the power supply unit DC and the radio frequency power amplifier unit PA in the short-circuit state by controlling the second switching unit 300 to switch from the off state to the on state, thereby protecting the first protection unit 100, and after a preset time period, the first switching unit 200 is controlled to switch from the on state to the off state, which can disconnect the power transmission path between the power supply unit DC and the radio frequency power amplifier unit PA, thereby providing rapid short-circuit protection for the radio frequency power amplifier unit PA, improving the short-circuit protection effect, and then after the radio frequency power amplifier unit PA changes from the short-circuit state to the short-circuit exclusion state, the second switching unit 300 is controlled to switch from the on state to the off state, which can restore the working state of the first protection unit 100 in priority, avoid the influence of the radio frequency energy generated by the radio frequency power amplifier unit PA after the preset time period on the power supply unit DC, and isolate the radio frequency power amplifier unit PA, thereby providing protection for the radio frequency power amplifier unit PA and the power supply unit DC, and after a preset time period, the first switching unit 200 is controlled to switch from the off state to the on state, which can connect the power transmission path between the power supply unit DC and the radio frequency power amplifier unit PA, thereby restoring the power supply to the radio frequency power amplifier unit PA.

[0036] Please refer to Figure 2 , Figure 2 is a circuit schematic diagram of the radio frequency power amplifier protection circuit in some embodiments of the present application. As Figure 2As shown, the first protection unit 100 includes a first choke L1, the first choke L1 has a first inductance value, and the first inductance value is greater than a first threshold value. The first switching unit 200 includes a first switch S1, the second switching unit 300 includes a second switch S2, and the first switch S1 and the second switch S2 are used to be closed or opened respectively to correspondingly turn on or turn off the connection path of the branch where the first switching unit 200 and the second switching unit 300 are located. The control unit 400 is used to control the first switch S1 and the second switch S2 to be closed or opened respectively to correspondingly control the first switching unit 200 and the second switching unit 300 to switch to the turn-on state or the turn-off state.

[0037] Therefore, the above-mentioned radio frequency power amplifier protection circuit 10 in the present application can isolate the power supply unit DC and the radio frequency power amplifier unit PA by configuring the first choke L1 and the first inductance value greater than the first threshold value, so as to protect the power supply unit DC and the radio frequency power amplifier unit PA in the radio frequency frequency range, and by setting the first switch S1 and the second switch S2, the first switching unit 200 and the second switching unit 300 can be correspondingly controlled to switch to the turn-on state or the turn-off state.

[0038] When the first switching unit 200 is in the turn-on state and the second switching unit 300 is in the turn-off state, the first choke L1 is electrically connected between the power supply unit DC and the radio frequency power amplifier unit PA to isolate the power supply unit DC and the radio frequency power amplifier unit PA, so as to avoid the radio frequency energy generated by the radio frequency power amplifier unit PA from affecting the power supply unit DC, and the radio frequency power amplifier unit PA is also isolated, thereby providing protection for the radio frequency power amplifier unit PA and the power supply unit DC. When the second switching unit 300 is in the turn-on state, the first choke L1 is short-circuited.

[0039] Please refer to Figure 3 , Figure 3 This is another block schematic diagram of the radio frequency power amplifier protection circuit in some embodiments of the present application. As shown in the figure, Figure 3As shown, the power supply unit DC includes a positive power supply electrode and a negative power supply electrode, and the RF power amplifier unit PA includes a positive input terminal and a negative input terminal. The first protection unit 100 includes a first protection module 110 and a second protection module 120, the first switching unit 200 includes a first switching module 210 and a second switching module 220, and the second switching unit 300 includes a third switching module 310 and a fourth switching module 320. The first protection module 110 and the first switching module 210 are sequentially connected between the positive power supply electrode and the positive input terminal, the second protection module 120 and the second switching module 220 are sequentially connected between the negative power supply electrode and the negative input terminal, the third switching module 310 is connected to both ends of the first protection module 110, and the fourth switching module 320 is connected to both ends of the second protection module 120. The first protection module 110 and the second protection module 120 both have a first inductance value. Among them, the first switching module 210 and the second switching module 220 are synchronously in the on state or the off state, so that the first switching unit 200 is correspondingly in the on state or the off state, the third switching module 310 and the fourth switching module 320 are synchronously in the on state or the off state, so that the second switching unit 300 is correspondingly in the on state or the off state, and the control unit 400 is used to synchronously control the first switching module 210 and the second switching module 220 to switch to the on state or the off state, so as to correspondingly control the first switching unit 200 to switch to the on state or the off state, and to synchronously control the third switching module 310 and the fourth switching module 320 to switch to the on state or the off state, so as to correspondingly control the second switching unit 300 to switch to the on state or the off state.

[0040] Therefore, the above-mentioned RF power amplifier protection circuit 10 in the present application can achieve short-circuit protection for the Class D RF power amplifier unit PA through the corresponding two protection modules and four switching modules.

[0041] In some embodiments, the relevant functions of the first protection module 110 and the second protection module 120 can refer to the relevant description of the first protection unit 100 of the aforementioned Class E RF power amplifier unit PA, the relevant functions of the first switching module 210 and the second switching module 220 can refer to the relevant description of the first switching unit 200 of the aforementioned Class E RF power amplifier unit PA, and the relevant functions of the third switching module 310 and the fourth switching module 320 can refer to the relevant description of the second switching unit 300 of the aforementioned Class E RF power amplifier unit PA, which will not be repeated here.

[0042] In some embodiments, the negative power supply terminal and the negative input terminal may be grounded.

[0043] In some embodiments, the RF power amplifier protection circuit 10 may further include a transformer, which includes a first winding and a second winding coupled to each other, one end of the first winding is connected to the first switching module 210, the other end of the first winding is connected to the negative input end, one end of the second winding is connected to the positive pole of the power supply, and the other end of the second winding is connected to the negative pole of the power supply.

[0044] Therefore, the above-mentioned RF power amplifier protection circuit 10 in the present application can isolate the short-circuit protection part from the RF power amplifier unit PA, so as to better perform short-circuit protection on the RF power amplifier unit PA.

[0045] Please also refer to Figure 4 , Figure 4 FIG. 1 is another circuit diagram of the radio frequency power amplifier protection circuit in some embodiments of the present application. Figure 3 、 Figure 4 As shown, the first protection module 110 includes a second choke coil L2 , and the second protection module 120 includes a third choke coil L3 . The second choke coil L2 and the third choke coil L3 both have a first inductance value, and the first inductance value is greater than a first threshold value. The first switching module 210 includes a third switch S3, the second switching module 220 includes a fourth switch S4, the third switching module 310 includes a fifth switch S5, and the fourth switching module 320 includes a sixth switch S6. The third switch S3, the fourth switch S4, the fifth switch S5, and the sixth switch S6 are respectively configured to be closed or opened to respectively switch on or off the first switching module 210, the second switching module 220, the third switching module 310, and the fourth switching module 320. The control unit 400 is configured to synchronously control the third switch S3 and the fourth switch S4 to be closed or opened to respectively control the first switching module 210 and the second switching module 220 to be synchronously switched to the on state or the off state, and to synchronously control the fifth switch S5 and the sixth switch S6 to be closed or opened to respectively control the third switching module 310 and the fourth switching module 320 to be synchronously switched to the on state or the off state.

[0046] Therefore, the RF power amplifier protection circuit 10 in the present application can implement short-circuit protection for the Class D RF power amplifier unit PA through the corresponding two chokes and four switches.

[0047] In some embodiments, the relevant functions of the second choke L2 and the third choke L3 can refer to the relevant description of the first choke L1 of the aforementioned Class E RF power amplifier unit PA, the relevant functions of the third switch S3 and the fourth switch S4 can refer to the relevant description of the first switch S1 of the aforementioned Class E RF power amplifier unit PA, and the relevant functions of the fifth switch S5 and the sixth switch S6 can refer to the relevant description of the second switch S2 of the aforementioned Class E RF power amplifier unit PA, which will not be repeated here.

[0048] Please refer again Figure 3 .like Figure 3 As shown, the RF power amplifier protection circuit 10 also includes a second protection unit 500, one end of the second protection unit 500 is connected to the connection point between the first switching module 210 and the positive input terminal, the other end of the second protection unit 500 is connected to the connection point between the second switching module 220 and the negative input terminal, and the second protection unit 500 has a first capacitance value.

[0049] Therefore, the above-mentioned RF power amplifier protection circuit 10 in the present application, by setting the second protection unit 500, can provide more comprehensive protection when a short circuit occurs in the RF power amplifier unit PA, further avoid damage to the first protection unit 100, and further avoid the risk of high voltage in the first protection unit 100.

[0050] In some embodiments, the second protection unit 500 may include a first capacitor, one end of the first capacitor is connected to the connection point between the first switching module 210 and the positive input terminal, and the other end of the first capacitor is connected to the connection point between the second switching module 220 and the negative input terminal, and the first capacitor has a first capacitance value, so that the second protection unit 500 has the first capacitance value.

[0051] In some embodiments, the control unit 400 can be a general-purpose processor such as a central processing unit (CPU), or a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate logic devices, transistor logic devices and other logic control devices, or a microprocessor such as a micro control unit (MCU).

[0052] The RF power amplifier protection circuit 10 of the present application, through the above-mentioned structure, can not only cooperate with the first protection unit 100 to effectively short-circuit protect the RF power amplifier unit PA, but also avoid the risk of high voltage in the first protection unit 100 when short-circuiting the RF power amplifier unit PA, thereby avoiding damage to the first protection unit 100 and resulting in the inability to effectively protect the RF power amplifier unit PA.

[0053] See also Figure 5 , Figure 5 Schematic diagram of the steps of the radio frequency power amplifier protection method in some embodiments of the present application. Figure 5As shown, the present application also provides a radio frequency power amplifier protection method, which is applied to the radio frequency power amplifier protection circuit in any of the aforementioned embodiments, and the radio frequency power amplifier protection method includes:

[0054] Step S100: Acquire the working status of the radio frequency power amplifier unit.

[0055] Step S200: controlling the second switching unit to switch to the on state or the off state according to the working state of the radio frequency power amplifier unit.

[0056] Step S300: After a preset period of time, the first switching unit is controlled to switch to an on state or an off state.

[0057] In the preset period, the first switching unit and the second switching unit are both in the on state or both in the off state.

[0058] Therefore, the above-mentioned RF power amplifier protection method in the present application can switch the states of the first switching unit and the second switching unit at preset time intervals according to the working state of the RF power amplifier unit, can cooperate with the first protection unit to effectively short-circuit protect the RF power amplifier unit, and can also avoid the high voltage risk of the first protection unit when short-circuiting the RF power amplifier unit, thereby avoiding damage to the first protection unit and resulting in the inability to effectively protect the RF power amplifier unit.

[0059] See also Figure 6 , Figure 6 This is another step diagram of the RF power amplifier protection method in some embodiments of the present application. The working state of the RF power amplifier unit includes a short circuit state and a short circuit elimination state. Figure 6 As shown, the RF power amplifier protection method may also include:

[0060] Step S100: Acquire the working status of the radio frequency power amplifier unit.

[0061] Step S210: When the RF power amplifier unit is in a short-circuit state, the second switching unit is controlled to switch from an off state to an on state, and the first switching unit is controlled to remain in an on state.

[0062] Step S310: After a preset period of time, the first switching unit is controlled to switch from the on state to the off state.

[0063] Therefore, the above-mentioned RF power amplifier protection method in the present application, when the RF power amplifier unit is in a short-circuit state, controls the first switching unit to switch from the on state to the off state, controls the second switching unit to remain in the off state, and controls the second switching unit to switch from the off state to the on state after a preset period of time. This can effectively protect the RF power amplifier unit from short circuit, and can also avoid the risk of high voltage when the RF power amplifier unit is short-circuited.

[0064] Among them, such as Figure 6 Step S210 shown may be as follows Figure 5 The steps specifically included in step S200 are as follows: step S200: controlling the second switching unit to switch to the on state or the off state according to the working state of the RF power amplifier unit, and specifically step S210: controlling the second switching unit to switch from the off state to the on state when the RF power amplifier unit is in the short-circuit state, and controlling the first switching unit to remain in the on state. Figure 6 The step S310 shown can also be as follows Figure 5 The steps specifically included in step S300 shown, namely, step S300: controlling the first switching unit to switch to the on state or the off state after a preset period of time, may specifically include step S310: controlling the first switching unit to switch from the on state to the off state after a preset period of time.

[0065] See also Figure 7 , Figure 7 Schematic diagram of another step of the RF power amplifier protection method in some embodiments of the present application. The working state of the RF power amplifier unit includes a short circuit state and a short circuit elimination state. Figure 7 As shown, the RF power amplifier protection method may further include:

[0066] Step S100: Acquire the working status of the radio frequency power amplifier unit.

[0067] Step S220: After the RF power amplifier unit changes from the short-circuit state to the short-circuit clearing state, the second switching unit is controlled to switch from the on state to the off state.

[0068] Step S320: After a preset period of time, the first switching unit is controlled to switch from the off state to the on state.

[0069] Therefore, the above-mentioned RF power amplifier protection method in the present application can restore the RF power amplifier unit to normal operation by controlling the first switching unit to switch from the disconnected state to the on state after the RF power amplifier unit changes from the short-circuit state to the short-circuit elimination state, and controlling the second switching unit to switch from the on state to the disconnected state after a preset period of time.

[0070] Among them, such as Figure 7 Step S220 shown may be as follows Figure 5 The steps specifically included in step S200 are as follows: step S200: controlling the second switching unit to switch to the on state or the off state according to the working state of the RF power amplifier unit, and specifically step S220: controlling the second switching unit to switch from the on state to the off state after the RF power amplifier unit changes from the short circuit state to the short circuit elimination state. Figure 7 The step S320 shown can also be as follows Figure 5The steps specifically included in step S300 shown, namely, step S300: controlling the first switching unit to switch to the on state or the off state after a preset period of time, may specifically include step S320: controlling the first switching unit to switch from the off state to the on state after a preset period of time.

[0071] Among them, such as Figure 6 、 Figure 7 For details of step S100 shown, please refer to the above-mentioned relevant content about step S100, which will not be repeated here.

[0072] The RF power amplifier protection circuit 10 and the RF power amplifier protection method of the present application, through the above-mentioned structure and steps, can not only cooperate with the first protection unit to effectively short-circuit protect the RF power amplifier unit, but also avoid the risk of high voltage in the first protection unit when short-circuiting the RF power amplifier unit, thereby avoiding damage to the first protection unit and resulting in the inability to effectively protect the RF power amplifier unit.

[0073] See also Figure 8 , Figure 8 FIG. 1 is a block diagram of a radio frequency power supply system in some embodiments of the present application. Figure 8 As shown, the present application further provides a radio frequency power supply system 1000, which includes a power supply unit DC, a radio frequency power amplifier unit PA, and the radio frequency power amplifier protection circuit 10 in any of the aforementioned embodiments.

[0074] Please refer again Figure 1 .like Figure 1 As shown, the RF power amplifier protection circuit 10 includes a first protection unit 100, a first switching unit 200, a second switching unit 300 and a control unit 400. The first protection unit 100 and the first switching unit 200 are used to be connected between the power supply unit DC and the RF power amplifier unit PA in sequence. The control unit 400 is connected to the first switching unit 200, the second switching unit 300 and the RF power amplifier unit PA. The second switching unit 300 is connected to both ends of the first protection unit 100, and the first protection unit 100 has a first inductance value. Among them, the first switching unit 200 is used to be in an on state or an off state to correspondingly turn on or off the connection path of the branch where the first switching unit 200 is located, and the second switching unit 300 is used to be in an on state or an off state to correspondingly turn on or off the connection path of the branch where the second switching unit 300 is located. The control unit 400 is used to obtain the working state of the RF power amplifier unit PA, control the second switching unit 300 to switch to an on state or an off state according to the working state of the RF power amplifier unit PA, and control the first switching unit 200 to switch to an on state or an off state after a preset time period, wherein in the preset time period, the first switching unit 200 and the second switching unit 300 are both in an on state or both in an off state.

[0075] The more specific structure of the RF power amplifier protection circuit 10 can be found in the relevant content of the RF power amplifier protection circuit 10 in any of the aforementioned embodiments, which will not be repeated here.

[0076] In some embodiments, the radio frequency power amplifier unit PA can be used to connect to a load to output radio frequency power to the load.

[0077] In some embodiments, the RF power supply system 1000 may further include an impedance matcher, which may be connected between the RF power amplifier unit PA and the load. The impedance matcher may be used to perform impedance matching on the RF power amplifier unit PA, the RF power amplifier protection circuit 10 and the load.

[0078] The RF power amplifier protection circuit 10, RF power amplifier protection method and RF power supply system 1000 of the present application can not only cooperate with the first protection unit 100 to effectively short-circuit protect the RF power amplifier unit PA, but also avoid the risk of high voltage in the first protection unit 100 when short-circuiting the RF power amplifier unit PA, thereby avoiding damage to the first protection unit 100 and resulting in the inability to effectively protect the RF power amplifier unit PA.

[0079] The above description is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application; the embodiments of this application and the features of the embodiments can be combined with each other unless there is a conflict. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A radio frequency power amplifier protection circuit, characterized in that: The device comprises a first protection unit, a first switching unit, a second switching unit, and a control unit, wherein the first protection unit and the first switching unit are used to be sequentially connected between a power supply unit and a radio frequency power amplifier unit, the control unit is connected to the first switching unit, the second switching unit, and the radio frequency power amplifier unit, the second switching unit is connected to both ends of the first protection unit, and the first protection unit has a first inductance value; The first switching unit is configured to be in an on state or an off state to correspondingly turn on or off the connection path of the branch where the first switching unit is located; the second switching unit is configured to be in an on state or an off state to correspondingly turn on or off the connection path of the branch where the second switching unit is located; the control unit is configured to obtain the working state of the RF power amplifier unit, control the second switching unit to switch to an on state or an off state according to the working state of the RF power amplifier unit, and control the first switching unit to switch to an on state or an off state after a preset period of time; wherein, during the preset period of time, the first switching unit and the second switching unit are both in an on state or both in an off state.

2. The radio frequency power amplifier protection circuit according to claim 1, characterized in that: The working state of the RF power amplifier unit includes a short-circuit state and a short-circuit elimination state. The control unit is used to control the second switching unit to switch from the off state to the on state when the RF power amplifier unit is in the short-circuit state, and control the first switching unit to remain in the on state, and control the first switching unit to switch from the on state to the off state after the preset time period, and control the second switching unit to switch from the on state to the off state after the RF power amplifier unit changes from the short-circuit state to the short-circuit elimination state, and control the first switching unit to switch from the off state to the on state after the preset time period.

3. The radio frequency power amplifier protection circuit according to claim 1, characterized in that: The first protection unit includes a first choke coil, the first choke coil has the first inductance value, and the first inductance value is greater than a first threshold value; The first switching unit includes a first switch, and the second switching unit includes a second switch. The first switch and the second switch are used to be closed or opened respectively to correspondingly turn on or off the connection path of the branch where the first switching unit and the second switching unit are located. The control unit is used to control the first switch and the second switch to be closed or opened respectively to correspondingly control the first switching unit and the second switching unit to switch to the on state or the off state.

4. The radio frequency power amplifier protection circuit according to claim 1, characterized in that: The power supply unit includes a positive power supply and a negative power supply, and the radio frequency power amplifier unit includes a positive input terminal and a negative input terminal; The first protection unit includes a first protection module and a second protection module, the first switching unit includes a first switching module and a second switching module, and the second switching unit includes a third switching module and a fourth switching module. The first protection module and the first switching module are sequentially connected between the positive electrode of the power supply and the positive input terminal, the second protection module and the second switching module are sequentially connected between the negative electrode of the power supply and the negative input terminal, the third switching module is connected to both ends of the first protection module, and the fourth switching module is connected to both ends of the second protection module. The first protection module and the second protection module both have the first inductance value. In which, the first switching module and the second switching module are synchronously in the on state or the off state, so that the first switching unit is correspondingly in the on state or the off state, and the third switching module and the fourth switching module are synchronously in the on state or the off state, so that the second switching unit is correspondingly in the on state or the off state, and the control unit is used to synchronously control the first switching module and the second switching module to switch to the on state or the off state, so as to correspondingly control the first switching unit to switch to the on state or the off state, and to synchronously control the third switching module and the fourth switching module to switch to the on state or the off state, so as to correspondingly control the second switching unit to switch to the on state or the off state.

5. The radio frequency power amplifier protection circuit according to claim 4, characterized in that: The first protection module includes a second choke coil, the second protection module includes a third choke coil, the second choke coil and the third choke coil both have the first inductance value, and the first inductance value is greater than a first threshold value; The first switching module includes a third switch, the second switching module includes a fourth switch, the third switching module includes a fifth switch, and the fourth switching module includes a sixth switch. The third switch, the fourth switch, the fifth switch, and the sixth switch are respectively used to be closed or opened to correspondingly turn on or off the first switching module, the second switching module, the third switching module, and the fourth switching module. The control unit is used to synchronously control the third switch and the fourth switch to be closed or opened to correspondingly control the first switching module and the second switching module to be synchronously switched to the on state or the off state, and to synchronously control the fifth switch and the sixth switch to be closed or opened to correspondingly control the third switching module and the fourth switching module to be synchronously switched to the on state or the off state.

6. The radio frequency power amplifier protection circuit according to claim 4, characterized in that: The RF power amplifier protection circuit also includes a second protection unit, one end of the second protection unit is connected to the connection point between the first switching module and the positive input terminal, the other end of the second protection unit is connected to the connection point between the second switching module and the negative input terminal, and the second protection unit has a first capacitance value.

7. A radio frequency power amplifier protection method, characterized in that: Applied to the radio frequency power amplifier protection circuit according to any one of claims 1 to 6, the radio frequency power amplifier protection method includes: Get the working status of the RF power amplifier unit; Controlling the second switching unit to switch to an on state or an off state according to the working state of the radio frequency power amplifier unit; After a preset period of time, the first switching unit is controlled to switch to an on state or an off state.

8. The radio frequency power amplifier protection method according to claim 7, characterized in that: The working state of the radio frequency power amplifier unit includes a short circuit state and a short circuit elimination state; The controlling the second switching unit to switch to the on state or the off state according to the working state of the RF power amplifier unit includes: when the RF power amplifier unit is in a short-circuit state, controlling the second switching unit to switch from the off state to the on state, and controlling the first switching unit to remain in the on state; The controlling the first switching unit to switch to the on state or the off state after the preset period includes: controlling the first switching unit to switch from the on state to the off state after the preset period.

9. The radio frequency power amplifier protection method according to claim 7, characterized in that: The working state of the radio frequency power amplifier unit includes a short circuit state and a short circuit elimination state; The controlling the second switching unit to switch to the on state or the off state according to the working state of the radio frequency power amplifier unit includes: controlling the second switching unit to switch from the on state to the off state after the radio frequency power amplifier unit changes from the short circuit state to the short circuit elimination state; The controlling the first switching unit to switch to the on state or the off state after the preset period includes: controlling the first switching unit to switch from the off state to the on state after the preset period.

10. A radio frequency power supply system, characterized in that: It comprises a power supply unit, a radio frequency power amplifier unit and the radio frequency power amplifier protection circuit according to any one of claims 1 to 6.

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