Power supply circuit of power amplifier tube, power supply board and base station power supply device

Abstract

The embodiment of the invention provides a power supply circuit of a power amplifier tube, a power supply board and a base station power supply device, the power supply circuit comprises an energy storage circuit, a first conversion circuit and a second conversion circuit, the energy storage circuit is used for conducting a power supply voltage; the first conversion circuit is respectively connected with the energy storage circuit and the drain electrode and the grid electrode of the power amplifier tube, and is used for outputting grid electrode voltage to the grid electrode after obtaining the power supply voltage from the energy storage circuit; the second conversion circuit is connected with the energy storage circuit and the drain electrode of the power amplifier tube, and is used for outputting a drain electrode voltage to the drain electrode based on the power supply voltage after receiving an enable signal generated after the grid electrode voltage is output; and the energy storage circuit is also used for forming a bypass after the drain voltage is output, so that the drain voltage and the power supply voltage form a series voltage, and the series voltage is input into the first conversion circuit. By arranging the energy storage circuit, the reliability of the power supply circuit is improved, the structure of the power supply circuit is simplified, the board occupation volume of the power supply circuit is reduced, and thus the preparation cost of the power supply circuit board is reduced.

Description

Technical Field

[0001] This application relates to the technical field of power amplifier tube power supply, and particularly relates to a power supply circuit for a power amplifier tube, a power supply board, and a base station power supply device. Background Art

[0002] With the development of base station communication technology, the requirements for base station radio frequency power amplifier tubes are getting higher and higher. As a key electronic component, the power amplifier tube needs to have high reliability to ensure the normal communication of the base station. Due to its particularity, there is a certain power-on and power-off timing sequence for the power amplifier tube. In order to ensure a certain power-on timing sequence, a certain power supply circuit is required to supply power to the power amplifier tube.

[0003] However, the power supply circuits in the related technologies have more or less reliability problems, which affect the power-on and power-off timing sequence of the power amplifier tube and easily cause damage to the power amplifier tube. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, this application proposes a power supply circuit for a power amplifier tube, a power supply board, and a base station power supply device, aiming to improve the reliability of the power supply circuit.

[0005] To achieve the above object, the first aspect of this application provides a power supply circuit for a power amplifier tube, including an energy storage circuit, a first conversion circuit, and a second conversion circuit. Among them, the energy storage circuit is used to conduct the supply voltage; the first conversion circuit is respectively connected to the energy storage circuit, the drain of the power amplifier tube, and the gate of the power amplifier tube, and is used to obtain the supply voltage from the energy storage circuit and output a gate voltage to the gate; the second conversion circuit is respectively connected to the energy storage circuit and the drain of the power amplifier tube, and is used to output a drain voltage to the drain based on the supply voltage after receiving an enable signal, and the enable signal is generated after the gate voltage is output; the energy storage circuit is further used to form a bypass after the drain voltage is output, so that the drain voltage and the supply voltage form a series voltage, and the series voltage is input into the first conversion circuit.

[0006] To achieve the above object, the second aspect of the embodiments of this application provides a power supply board for a power amplifier tube, and the power supply board includes the power supply circuit as described in the first aspect above.

[0007] To achieve the above object, the third aspect of the embodiments of this application proposes a base station power supply device, and the base station power supply device includes the power supply board as described in the second aspect above.

[0008] A power supply circuit, a power supply board and a base station power supply device for a power amplifier tube provided by an embodiment of the present application. By setting an energy storage circuit, the first conversion circuit can obtain relatively series voltage power supply by using the electric energy stored in the energy storage circuit during the power-down process, so that the power supply circuit can still ensure the power-down timing under normal circumstances or when the second conversion circuit is abnormal, improving the reliability of the power supply circuit; and, since the energy storage circuit can conduct voltage, the first conversion circuit does not need to conduct the power supply voltage through an additional input circuit during the power-up process, simplifying the structure of the power supply circuit, without introducing an additional power supply, improving the reliability of the power supply circuit and reducing the board occupation volume of the power supply circuit by reducing the complexity of the power supply circuit, thereby reducing the preparation cost of the power supply circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is the circuit schematic diagram of the power supply circuit in the related art;

[0010] Figure 2 is the circuit schematic diagram of the power supply circuit provided by an embodiment of the present application;

[0011] Figure 3 is the circuit schematic diagram of the power supply circuit provided by another embodiment of the present application;

[0012] Figures 4a to 4b is the circuit schematic diagram of the power supply circuit provided by another embodiment of the present application;

[0013] Figures 5a to 5b is the circuit schematic diagram of the power supply circuit provided by another embodiment of the present application;

[0014] Figures 6a to 6b is the circuit schematic diagram of the power supply circuit provided by another embodiment of the present application;

[0015] Figure 7 is the circuit schematic diagram of the power supply circuit provided by another embodiment of the present application;

[0016] Figures 8a to 8d is the circuit schematic diagram of the power supply circuit provided by another embodiment of the present application.

[0017] Figure 9 is the circuit schematic diagram of the power supply circuit provided by another embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0019] It should be noted that unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0020] With the development of base station communication technology, the requirements for base station radio frequency power amplifier tubes are getting higher and higher. As a key electronic component, the power amplifier tube must have high reliability to ensure the normal communication of the base station. Due to its particularity, there is a certain power-on and power-off timing sequence for the power amplifier tube. In the current power supply technology for power amplifier tubes, there are the following four common solutions:

[0021] The first solution is implemented by an electronic switch circuit. Before the drain voltage is supplied to the power amplifier, it is realized by controlling the electronic switch through the gate voltage. Only when the gate voltage is established, the electronic switch will open. Once the gate voltage is powered off, the electronic switch is immediately closed. There are many problems with the reliability of this implementation solution. Especially when the power amplifier tube self-oscillates or there is an abnormally large signal and high power, which causes the front-stage power supply to turn off and then restart, it is very easy to exceed the SOA curve of the electronic switch and get damaged, and the reliability is average.

[0022] The second solution is implemented through a discharge circuit. When the gate voltage is not powered off, it is realized by discharging the drain voltage. However, the reference voltage comparison point of the discharge circuit is easily interfered and abnormal, which is more likely to cause high-voltage discharge and damage the electronic switch of the discharge circuit, and the reliability is average.

[0023] The third solution is implemented through a dedicated timing control chip or a single-chip microcomputer, etc. It is more dependent on the timing control chip and cannot be controlled under abnormal conditions such as the controller, resulting in reliability and limitation problems.

[0024] The fourth solution is as Figure 1 shown, which is realized by using other power sources for oring combining power-on and power-off. It requires other power sources to implement, and also requires combining redundancy and multiple additional converter capacitors, resulting in reliability problems.

[0025] It can be seen that the above four existing solutions all have more or less reliability problems, which affect the power-on and power-off timing sequence of the power amplifier tube and are likely to cause damage to the power amplifier tube.

[0026] Based on this, this application proposes a power supply circuit, a power supply board and a base station power supply device for a power amplifier tube, aiming to improve the reliability of the power supply circuit.

[0027] The power supply circuit, power supply board and base station power supply device provided by the embodiments of this application are specifically described through the following embodiments. First, the power supply circuit provided in the first aspect of the embodiments of this application is described.

[0028] For the convenience of subsequent description, the terminals of devices such as capacitors, resistors, diodes, and switching devices that appear in this application are defined here. From the left to the right of the circuit shown in the accompanying drawings, for devices with terminals distributed horizontally, the first terminal is the left terminal of the device, and the second terminal is the right terminal of the device; for devices with terminals distributed vertically, the first terminal is the upper terminal of the device, and the second terminal is the lower terminal of the device; for devices with terminals distributed in all directions, the first terminal is the upper left terminal of the device, and the second terminal is the next terminal in the clockwise direction of the device from the first terminal.

[0029] Please refer to Figure 2 , Figure 2 which is the circuit schematic diagram of the power supply circuit provided by an embodiment of this application. In this application, the power supply circuit includes but is not limited to an energy storage circuit 11, a first conversion circuit 12, and a second conversion circuit 13.

[0030] The first conversion circuit 12 is respectively connected to the energy storage circuit 11, the drain and gate of the power amplifier tube. The first conversion circuit 12 is used to obtain the supply voltage from the energy storage circuit 11 and then output the gate voltage to the gate.

[0031] The second conversion circuit 13 is respectively connected to the energy storage circuit 11 and the drain of the power amplifier tube. After receiving the enable signal, the second conversion circuit 13 outputs the drain voltage to the drain based on the supply voltage.

[0032] The energy storage circuit 11 is used to conduct the supply voltage and form a bypass after the drain voltage is output, so that the drain voltage and the supply voltage form a series voltage, and the series voltage is input into the first conversion circuit 12.

[0033] It should be noted that the enable signal here is formed after the gate voltage appears.

[0034] Specifically, the input terminal of the first conversion circuit 12 and the output terminal of the energy storage circuit 11 are connected in parallel to the drain of the power amplifier tube. The output terminal of the first conversion circuit 12 is connected to the gate of the power amplifier tube. The input terminal of the energy storage circuit 11 is respectively connected to the second conversion circuit 13 and the power supply. The output terminal of the second conversion circuit 13 is connected to the drain. The second conversion circuit 13 includes an enable terminal, and the second conversion circuit 13 receives the enable signal through the enable terminal.

[0035] It should be noted that due to the requirement of the communication system for positive ground in each embodiment of this application, each circuit or component is connected to the power supply in a grounded form.

[0036] When the power supply is powered on, the power supply inputs a supply voltage to the second conversion circuit 13. At this time, since the supply circuit does not output a gate voltage, the enable terminal of the second conversion circuit 13 fails to receive an enable signal. Even if the supply voltage is input to the second conversion circuit 13, the second conversion circuit 13 will not perform voltage conversion on the supply voltage to prevent the drain voltage from being output first. When the supply voltage is input to the second conversion circuit 13, the energy storage circuit 11 stores energy for the first time according to the supply voltage and conducts the supply voltage to the first conversion circuit 12. That is to say, the first conversion circuit 12 is powered on through the energy storage circuit 11. At the same time, the output voltage of the second conversion circuit 13 is 0, keeping the power amplifier transistor still in the cut-off state.

[0037] After the supply voltage is input to the first conversion circuit 12, the first conversion circuit 12 performs voltage conversion according to the supply voltage and outputs a gate voltage from the output terminal of the first conversion circuit 12 to the gate. The voltage value of this gate voltage is greater than the turn-on voltage threshold of the power amplifier transistor, causing the power amplifier transistor to switch from the off state to the on state, and enabling the power amplifier transistor to adjust the static operating point first to prevent the drain from burning out the power amplifier transistor due to excessive input current. It should be noted that at this time, the power amplifier transistor is still in the cut-off state, and no drain current can be generated between the source and the drain inside the power amplifier transistor through the supply voltage.

[0038] After the first conversion circuit 12 outputs the gate voltage, the enable terminal of the second conversion circuit 13 will receive an enable signal to enable the second conversion circuit 13. In the enabled state, the second conversion circuit 13 performs voltage conversion on the input supply voltage, generates a drain voltage, and outputs the drain voltage from the output terminal of the second conversion circuit 13 to the drain. It should be noted that the drain voltage here is greater than the conduction voltage of the power amplifier transistor, causing the power amplifier transistor to switch from the cut-off state to the conduction state, and conducting the power amplifier transistor according to the "gate-drain" power-on timing sequence.

[0039] At the same time, since the input terminal of the energy storage circuit 11 is connected to the second conversion circuit 13, the energy storage circuit 11 will perform a second energy storage based on the drain voltage to form a bypass. At this time, for the supply circuit, on the premise that the power amplifier transistor is in the on state, the power amplifier transistor is only affected by the drain voltage, and the supply voltage does not affect the power amplifier transistor; while the first conversion circuit 12 is affected by both the supply voltage and the drain voltage. Therefore, when the energy storage circuit 11 forms a bypass, the first conversion circuit 12 is substantially affected by both the supply voltage and the drain voltage, that is, the energy storage circuit 11 forms a series voltage input to the first conversion circuit 12 through the supply voltage and the drain voltage. And due to the existence of the energy storage circuit 11, the voltage ripple in the supply circuit is suppressed to a certain extent, reducing the influence on the power amplifier transistor.

[0040] When the power supply is powered off, the energy storage circuit 11 becomes the power source for the power supply circuit. The energy storage circuit 11 will supply power to the first conversion circuit 12, the second conversion circuit 13, and the power amplifier tube. Since the energy storage circuit 11 performs secondary energy storage based on the supply voltage and the drain voltage, within a certain period of time after the power supply is powered off, the energy storage circuit 11 can continue to output a series voltage to the first conversion circuit 12. The first conversion circuit 12 outputs a gate voltage through the series voltage to continuously enable the second conversion circuit 13; the energy storage circuit 11 also continues to supply power to the second conversion circuit 13, and the second conversion circuit 13 generates a drain voltage according to the input voltage. During this process, since there is no external power source for the power supply circuit, the electrical energy stored in the energy storage circuit 11 will be gradually reduced, and the voltage provided by the energy storage circuit 11 to the second conversion circuit 13 will gradually decrease, causing the drain voltage output by the second conversion circuit 13 to also gradually decrease.

[0041] After the energy storage circuit 11 supplies energy for a certain period of time, the drain voltage output by the second conversion circuit 13 will drop to a certain voltage value, making the voltage difference between the drain and source of the power amplifier tube less than the conduction voltage, resulting in the power amplifier tube switching from the conduction state to the cut-off state and stopping generating the drain current. However, the cut-off of the power amplifier tube will not affect the release of the electrical energy of the energy storage circuit 11, and the energy storage circuit 11 still outputs electrical energy to the first conversion circuit 12 and the second conversion circuit 13. Under the influence of the series voltage output by the energy storage circuit 11, the first conversion circuit 12 still outputs a gate voltage to keep the power amplifier tube in the on state.

[0042] After the energy storage circuit 11 supplies energy again for a certain period of time, the gate voltage output by the first conversion circuit 12 will drop to a certain voltage value. At this time, the gate voltage is less than the turn-on voltage of the power amplifier tube, and the power amplifier tube switches from the on state to the off state, shutting down the power amplifier tube according to the "drain-gate" power-off timing sequence. The remaining electrical energy in the energy storage circuit 11 will still be released to the first conversion circuit 12, the second conversion circuit 13, and the power amplifier tube, and is consumed through the internal resistance in the power supply circuit.

[0043] During the power-down process, if the drain voltage of the second conversion circuit 13 suddenly drops due to overload or short circuit, etc., the energy storage circuit 11 will supply power to the first conversion circuit 12 and the drain at the same time. Through the two energy storages of the supply voltage and the drain voltage, there is a problem of voltage polarity at both ends of the energy storage circuit 11 (one end is positive voltage and the other end is negative voltage). Therefore, the second conversion circuit 13 can only obtain the electrical energy stored in the energy storage circuit 11 through the drain voltage. When the electrical energy stored through the drain voltage is released to a certain extent, the voltage output by the energy storage circuit 11 cannot keep the power amplifier tube conducting. At this time, the power amplifier tube is cut off. At this time, the energy storage circuit 11 only supplies power to the first conversion circuit 12, so that the first conversion circuit 12 can still obtain the relative series voltage through the energy storage circuit 11 in the case of abnormality of the second conversion circuit 13, so that the power supply circuit can still maintain a stable power-down timing, improving the reliability of the power supply circuit.

[0044] In the embodiment of the present application, by setting the energy storage circuit, the first conversion circuit can obtain relative series voltage power supply by using the electrical energy stored in the energy storage circuit during the power-down process, so that the power supply circuit can still ensure the power-down timing under normal conditions or in the case of abnormality of the second conversion circuit, improving the reliability of the power supply circuit; and, since the energy storage circuit can conduct voltage, the first conversion circuit does not need to conduct the supply voltage through an additional input circuit during the power-up process, simplifying the structure of the power supply circuit, without introducing an additional power supply, improving the reliability of the power supply circuit and reducing the board occupation volume of the power supply circuit by reducing the complexity of the power supply circuit, thereby reducing the preparation cost of the power supply circuit board.

[0045] It should be noted that the source of the enable signal here is specifically diverse, which can be the following embodiments or other embodiments. The embodiments of the present application do not limit this.

[0046] In one embodiment, on the premise that the second conversion circuit 13 can bear it, the enable terminal of the second conversion circuit 13 is directly connected to the gate, and the gate voltage is directly used as the enable signal and output to the enable terminal of the second conversion circuit 13.

[0047] In one embodiment, there is a central control board in the application device where the power supply circuit is located. The central control board is respectively connected to the enable terminal of the second conversion circuit 13 and the gate of the power amplifier tube. The hollow board outputs an enable signal to the second conversion circuit 13 by sampling the voltage or current of the gate.

[0048] It should be noted that since there are certain energy storage elements in the energy storage circuit 11, there is a certain voltage change curve for the conducted supply voltage and the drain voltage output by the second conversion circuit 13. Based on this, there are the following embodiments for the gate power-up or the drain power-up, or other embodiments. The embodiments of the present application do not limit this.

[0049] In one embodiment, the voltage value of the turn-on voltage of the power amplifier transistor is less than the voltage value of the gate voltage output by the first conversion circuit 12 when the power supply is stably powered on. At the beginning of power-on of the power supply, the energy storage circuit 11 conducts the supply voltage, the input voltage of the first conversion circuit 12 shows an upward trend, and the output gate voltage also shows an upward trend. When the input voltage of the first conversion circuit 12 rises to a certain value, the gate voltage output by the first conversion circuit 12 turns on the power amplifier transistor. After the input voltage of the first conversion circuit 12 rises to the supply voltage, the gate voltage tends to be stable.

[0050] In one embodiment, the voltage value of the turn-on voltage of the power amplifier transistor is equal to the voltage value of the gate voltage output by the first conversion circuit 12 when the power supply is stably powered on. At the beginning of power-on of the power supply, the energy storage circuit 11 conducts the supply voltage, the input voltage of the first conversion circuit 12 shows an upward trend, and the output gate voltage also shows an upward trend. However, since the input voltage of the first conversion circuit 12 does not rise to the supply voltage, the gate voltage output by the first conversion circuit 12 cannot turn on the power amplifier transistor. After the input voltage of the first conversion circuit 12 rises to the supply voltage, the gate voltage can turn on the power amplifier transistor.

[0051] In one embodiment, the voltage value of the conduction voltage of the power amplifier transistor is less than the voltage value of the drain voltage when the second conversion circuit 13 stably outputs. When the second conversion circuit 13 receives an enable signal, the output drain voltage will show an upward trend. When the drain voltage rises to a certain value, the drain voltage output by the second conversion circuit 13 turns on the power amplifier transistor. At this time, the output drain voltage will continue to rise until the energy storage circuit 11 completes energy storage based on the drain voltage, and the drain voltage output by the second conversion circuit 13 tends to be stable.

[0052] In one embodiment, the voltage value of the conduction voltage of the power amplifier transistor is equal to the voltage value of the drain voltage when the second conversion circuit 13 stably outputs. When the second conversion circuit 13 receives an enable signal, the output drain voltage will show an upward trend, but the rising drain voltage is less than the drain voltage when stably output, and the second conversion circuit 13 cannot turn on the power amplifier transistor until the energy storage circuit 11 completes energy storage based on the drain voltage, and the drain voltage output by the second conversion circuit 13 can turn on the power amplifier transistor.

[0053] It should be noted that after the energy storage circuit 11 supplies energy for a certain period of time, the specific form in which the drain voltage output by the second conversion circuit 13 will drop to a certain voltage value is diverse. It can be the following embodiments or other embodiments, and the embodiments of the present application do not limit this.

[0054] In one embodiment, the voltage value of the conduction voltage of the power amplifier transistor is less than the voltage value of the drain voltage when the second conversion circuit 13 stably outputs. At this time, after the power supply is powered off, the second conversion circuit 13 can still output a drain voltage greater than the conduction voltage for a certain period of time, so that the power amplifier transistor can still maintain the conduction state for a certain period of time after power-off until the drain voltage is less than the conduction voltage.

[0055] In one embodiment, the voltage value of the conduction voltage of the power amplifier transistor is equal to the voltage value of the drain voltage when the second conversion circuit 13 stably outputs. At this time, after the power supply is powered off, the second conversion circuit 13 can still output a drain voltage equal to the conduction voltage for an instant. Then, since the energy storage circuit 11 starts to output electrical energy outward, the second conversion circuit 13 cannot maintain the output of the drain voltage equal to the conduction voltage, and the power amplifier transistor will immediately enter the cut-off state.

[0056] It should be noted that after the energy storage circuit 11 supplies energy again for a certain period of time, the specific form in which the gate voltage output by the first conversion circuit 12 drops to a certain voltage value is diverse, which can be the following embodiments or other embodiments.

[0057] In one embodiment, the voltage value of the turn-on voltage of the power amplifier transistor is less than the voltage value of the gate voltage output by the first conversion circuit 12 when the power supply is powered on. At this time, after the energy storage circuit 11 outputs a voltage equal to the supply voltage value to the first conversion circuit 12, the energy storage circuit 11 can still output a gate voltage greater than the turn-on voltage for a certain period of time, so that the power amplifier transistor can still maintain the turn-on state during this period until the gate voltage is less than the turn-on voltage.

[0058] In one embodiment, the voltage value of the turn-on voltage of the power amplifier transistor is equal to the voltage value of the gate voltage output by the first conversion circuit 12 when the power supply is powered on. At this time, due to the continuous release of electrical energy by the energy storage circuit 11, after the energy storage circuit 11 outputs a voltage equal to the supply voltage value to the first conversion circuit 12, the first conversion circuit 12 cannot output a gate voltage equal to the turn-on voltage, and the power amplifier transistor enters the off state.

[0059] It should be noted that the specific form of the energy storage circuit 11 here is diverse, which can be the following embodiments or other embodiments, and the embodiments of the present application do not limit this.

[0060] In one embodiment, it is composed of an inductor and a controlled switching device. The controlled switch performs frequent switching after receiving the enable signal, generates a voltage across the inductor through current mutation, and outputs the stored electrical energy in the form of voltage.

[0061] Please refer to Figure 3 , Figure 3The circuit schematic diagram of the power supply circuit provided by another embodiment of the present application. In one embodiment, the energy storage circuit 11 includes but is not limited to a first gating unit 111, a first capacitor 112, and a second capacitor 113.

[0062] The first gating unit 111 is used to conduct the supply voltage and form a bypass after the drain voltage is output, so that the drain voltage and the supply voltage form a series voltage. One end of the first capacitor 112 (corresponding to Figure 3 C1 in Figure 3 is connected to the second conversion circuit 13. The first capacitor 112 is used to store energy based on the supply voltage after the first gating unit 111 forms a bypass, and release energy to the first conversion circuit 12 after the drain voltage is powered off. The second capacitor 113 (corresponding to

[0063] Specifically, in the Figure 3 shown power supply circuit, the first end of the first capacitor 112 is respectively connected to the power supply, the input end of the second conversion circuit 13, and the second end of the second capacitor 113, so that the first capacitor 112, the second conversion circuit 13, and the second capacitor 113 form a parallel structure relative to the power supply. The output end of the second conversion circuit 13 is connected to the drain, the first end of the first gating unit 111 is connected to the drain, the second end of the first gating unit 111 is connected to the second conversion circuit 13, the first end of the second capacitor 113 is connected to the drain, the input end of the first conversion circuit 12 is connected to the drain, and the output end of the first conversion circuit 12 is connected to the gate.

[0064] When the power supply is powered on and the gate voltage has not been output yet, the first capacitor 112 and the second capacitor 113 store energy through the supply voltage. At this time, under the action of the first gating unit 111, the current flows from the power supply to the first conversion circuit 12, so that the first conversion circuit 12 obtains a certain power to generate the gate voltage. At this time, the voltage across the first capacitor 112 is the supply voltage, and the voltage across the second capacitor 113 is relatively small and approximately 0 due to the gating of the first gating unit 111. The first conversion circuit 12 generates the gate voltage according to the supply voltage.

[0065] After the power supply circuit outputs the gate voltage, the second conversion circuit 13 is enabled, so that the second conversion circuit 13 outputs the drain voltage according to the power supply voltage. At this time, the voltage across the first capacitor 112 remains unchanged and is still the power supply voltage; while the voltage across the second capacitor 113 changes due to the output of the drain voltage, and the voltage difference across the second capacitor 113 is the voltage difference between the drain voltage and the power supply voltage. In this process, the first selection unit 111 forms a bypass due to the drain voltage, and the first capacitor 112 still stores energy through the power supply voltage; the second capacitor 113 stores energy based on the drain voltage after the first selection unit 111 forms a bypass due to the sudden change in the voltage across the two ends.

[0066] When the power supply is turned off, the first capacitor 112 and the second capacitor 113 become the power supply of the power supply circuit, and release energy to each circuit structure in the power supply circuit to offset the voltage mutation caused by the loss of power input. When the first capacitor 112 and the second capacitor 113 release electric energy, the first conversion circuit 12 and the second conversion circuit 13 can both obtain the electric energy released by the two capacitors, so that the first conversion circuit 12 and the second conversion circuit 13 can output the gate voltage and the drain voltage correspondingly within a specific time period after power is turned off. The specific power-off process is as follows:

[0067] Due to the bypass effect of the first selection unit 111, the second capacitor 113 supplies power to the first conversion circuit 12 and the drain at the same time after power-off, and the first capacitor 112 supplies power to the second conversion circuit 13. Since the number of power supply targets of the second capacitor 113 is greater than the number of power supply targets of the first capacitor 112, the power release speed of the second capacitor 113 is greater than the power release speed of the first capacitor 112.

[0068] For the second conversion circuit 13, the second conversion circuit 13 is affected by the drain voltage. First, the second capacitor 113 releases electric energy to the drain to form a drain voltage, the first capacitor 112 releases electric energy to the second conversion circuit 13, and the second conversion circuit 13 outputs a drain voltage to keep the power amplifier tube in a conducting state; when the second capacitor 113 and the first capacitor 112 release electric energy to a certain extent, the drain voltage is less than the conduction voltage, and the power amplifier tube is cut off at this time, and the electric energy of the second capacitor 113 and the first capacitor 112 is released to the first conversion circuit 12, and at this time, the drain of the power amplifier tube is powered off before the gate.

[0069] For the first conversion circuit 12, the first conversion circuit 12 is affected by the series voltage. First, the second capacitor 113 releases electrical energy to the first conversion circuit 12, enabling the first conversion circuit 12 to continuously output the gate voltage of the high-voltage turn-on voltage; when the electrical energy release of the second capacitor 113 is completed, under the action of the first gating unit 111, the first capacitor 112 takes over the power supply to the first conversion circuit 12. When the electrical energy of the first capacitor 112 is released to a certain extent and the first conversion circuit 12 can no longer output a gate voltage greater than the turn-on voltage, the power amplifier transistor turns off. At this time, the gate is finally powered down, and the remaining electrical energy of the first capacitor 112 is completely released in the form of heat generated by the internal resistance of the power supply circuit.

[0070] During the power-down process, if the drain voltage of the second conversion circuit 13 suddenly drops due to overload or short circuit, etc., the energy storage circuit 11 will supply power to both the first conversion circuit 12 and the drain at the same time. Due to the polarity problem of the voltage across the energy storage circuit 11, when the second capacitor 113 still stores electrical energy, the first gating unit 111 will be cut off. At this time, the second capacitor 113 supplies power to the drain and the first conversion circuit 12. When the electrical energy stored in the second capacitor 113 is released to a certain extent and the voltage output by the energy storage circuit 11 cannot keep the power amplifier transistor conducting, the power amplifier transistor is cut off, and the second capacitor 113 only supplies power to the first conversion circuit 12; when the electrical energy release of the second capacitor 113 is completed, the first gating unit 111 will be cut off. After the electrical energy release of the second capacitor 113 is completed, the first conversion circuit 12 can be powered by the first capacitor 112 until the gate is powered down. That is to say, during the power-down process, the first conversion circuit 12 can still obtain the relative series voltage through the first capacitor 112 and the second capacitor 113, enabling the power supply circuit to maintain a stable power-down timing and improving the reliability of the power supply circuit.

[0071] It should be noted that the positive pole of the second capacitor 113 in each embodiment of the present application refers to the end where the second capacitor 113 is connected to the drain, that is, the first end of the second capacitor 113 described above.

[0072] It should be noted that the specific form of the first gating unit 111 is diverse, including but not limited to one of the following: diode, MOS switch tube, gating circuit, circuit breaker, buck-boost circuit, drive power supply and other circuits or devices.

[0073] It should be noted that the above specific form of the first gating unit 111 can be a controlled circuit or device, or a non-controlled circuit or device. Exemplarily, components such as diodes, MOS switching transistors, gating circuits, circuit breakers, and buck-boost circuits are ordinary circuits or devices that generate outputs when there is an input. Additionally, components such as diodes, MOS switching transistors, gating circuits, circuit breakers, buck-boost circuits, and drive power supplies are controlled circuits or devices, and the gating of the first gating unit 111 is controlled by an external control device. It is gated when the first gating unit 111 is enabled, and not gated otherwise. For example, it corresponds to an enable signal, so that the gating of the first gating unit 111 is synchronized with the enabling of the second conversion circuit 13. The embodiments of the present application do not limit this.

[0074] Exemplarily, when the first gating unit 111 is a MOS switching transistor, the MOS switching transistor is reversely connected between the second conversion circuit 13 and the drain, and a bypass effect is formed through the parasitic diode of the MOS switching transistor.

[0075] The energy storage circuit of the embodiments of the present application enables the first conversion circuit to still be powered by the series voltage after power-off by setting the first gating unit, the first capacitor, and the second capacitor, and utilizes the principle that the energy release speeds of the capacitors are different, so that the drain can be powered off prior to the gate. Moreover, due to the simple structure of the energy storage circuit, the reliability of the energy storage circuit is improved, thereby enhancing the stability of the power amplifier transistor to power off stably according to the predetermined power-off timing.

[0076] It should be noted that the specific form of the second conversion circuit 13 here is diverse. Specifically, different second conversion circuits 13 are connected to the first gating unit 111 in different ways. The second conversion circuit 13 can be the following embodiments or other embodiments, and the embodiments of the present application do not limit this.

[0077] Please refer to Figures 4a to 4b and Figures 5a to 5b , Figures 4a to 4b which is the circuit schematic diagram of the power supply circuit provided by another embodiment of the present application. Figures 5a to 5b which is the circuit schematic diagram of the power supply circuit provided by another embodiment of the present application. In one embodiment, the second conversion circuit 13 includes but is not limited to the first DC-DC conversion circuit 131.

[0078] Specifically, see Figures 4a to 4b and Figures 5a to 5bIn the shown power supply circuit, the first end of the first capacitor 112 is connected to the input end of the first DC-DC conversion circuit 131, the second capacitor 113 is connected between the input end and the drain of the first DC-DC conversion circuit 131, the second end of the first gating unit 111 is connected to the first end of the first capacitor 112, the first end of the first gating unit 111 is connected to the drain, the first end of the second capacitor 113 is connected to the drain, and the output end of the first DC-DC conversion circuit 131 is connected to the drain, so that the first DC-DC conversion circuit 131 is in parallel with the first gating unit 111. The connection mode of the first conversion circuit 12 is the same as that of Figure 3 the same.

[0079] When the power supply powers on the power supply circuit and inputs a supply voltage, at this time, the second conversion circuit 13 does not output a drain voltage when the first conversion circuit 12 does not output a gate voltage. The first gating unit 111 is gated to form a current path between the supply voltage and the first conversion circuit 12, and the supply voltage is input into the first conversion circuit 12.

[0080] At this time, since the second capacitor 113 and the first gating unit 111 are in relative parallel connection, the voltage across the second capacitor 113 is small and close to 0; while the first capacitor 112 can store energy through the supply voltage, making the voltage across itself equal to the supply voltage.

[0081] After the first conversion circuit 12 outputs a gate voltage, the second conversion circuit 13 will be enabled through an enable signal. At this time, the supply voltage input to the second conversion circuit 13 can generate a drain voltage. After the drain voltage is generated, the first gating unit 111 will form a bypass. The voltage difference between the input end and the output end of the second conversion circuit 13 is the voltage difference between the drain voltage and the supply voltage. Since the first gating unit 111 is in parallel with the second conversion circuit, the second capacitor 113 is charged and stores energy through the drain voltage, making the voltage across the second capacitor 113 equal to the parallel voltage and generating a series voltage together with the first capacitor 112 to supply the first conversion circuit 12.

[0082] When powered off, under the bypass effect of the first gating unit 111, the second capacitor 113 supplies power to the first conversion circuit 12 and the drain simultaneously after power-off, and the first capacitor 112 supplies power to the second conversion circuit 13. After the first capacitor 112 and the second capacitor 113 release energy to a certain extent, the drain voltage output by the power supply circuit is less than the conduction voltage of the power amplifier tube, and the power amplifier tube is cut off. At this time, the first capacitor 112 supplies power to the first conversion circuit 12 through the second conversion circuit 13, and the second capacitor 113 continues to supply power to the first conversion circuit 12 to supply power to the first conversion circuit 12 in the way of series voltage. After the second capacitor 113 completes energy release, the first gating unit 111 is re-gated to form a current path, and the first capacitor 112 supplies power to the first conversion circuit 12 and the second conversion circuit 13 simultaneously. After the first capacitor 112 releases energy to a certain extent, the power amplifier tube is turned off and supplies power to the first conversion circuit 12 and the second conversion circuit 13 simultaneously until the first capacitor 112 completes energy release.

[0083] Please refer to Figures 6a to 6b , Figures 6a to 6b which is the circuit schematic diagram of the power supply circuit provided by another embodiment of the present application. In one embodiment, the second conversion circuit 13 includes but is not limited to a DC-DC converter 132.

[0084] It should be noted that the specific form of the DC-DC converter 132 is diverse. Exemplarily, such as mutual inductors, coupled inductors or multiple inductors in parallel, etc. The embodiments of the present application do not limit this. The following embodiments are described in the form of one inductor, and other DC-DC converters can refer to the following embodiments, which will not be elaborated here.

[0085] The DC-DC converter 132 is connected between the first capacitor 112 and the first gating unit 111, and the DC-DC converter 132 outputs a drain voltage to the drain.

[0086] Specifically, in the Figures 6a to 6b shown circuit, the first end of the first capacitor 112 is connected to the first end of the DC-DC converter 132, the second end of the DC-DC converter 132 is connected to the first end of the first gating unit 111, the second end of the first gating unit 111 is respectively connected to the drain, the input end of the first conversion circuit 12 and the first end of the second capacitor 113, the output end of the first conversion circuit 12 is connected to the gate, and the second end of the second capacitor 113 is connected to the power supply.

[0087] When the power supply powers on the power supply circuit, the second gating unit 133 is in an open state. The first capacitor 112 stores energy first through the supply voltage. And due to the sudden change in the supply voltage generated at the moment of power-on, the DC-DC converter 132 also stores energy through the supply voltage and forms a current path through the first gating unit 111 to conduct the supply voltage to the drain and the first conversion circuit 12. The second capacitor 113 cannot store energy due to the common node. The first conversion circuit 12 generates a gate voltage to power on the gate, and the power supply circuit generates an enable signal.

[0088] After receiving the enable signal, the first gating unit 111 will frequently switch between the gating state and the cut-off state to cause a current mutation inside the DC-DC converter 132. When there is a current mutation in the DC-DC converter 132, a voltage will be generated across the DC-DC converter 132 and the drain voltage will be output to the drain. At this time, the first gating unit 111 forms a bypass and is in a conducting state so that the drain voltage output by the DC-DC converter 132 can be conducted to the drain. During this process, the second capacitor 113 is charged and stores energy through the drain voltage to form a series voltage with the supply voltage.

[0089] When the power supply is powered off, the first gating unit 111 continues to switch between the gating state and the cut-off state multiple times. The first capacitor 112 supplies power to the DC-DC converter 132, and the second capacitor 113 supplies power to the drain and the first conversion circuit 12. After the second capacitor 113 releases electrical energy to a certain extent, the power amplifier transistor is cut off and continues to supply power to the first conversion circuit 12, while the first capacitor 112 supplies power to the DC-DC converter 132. After the second capacitor 113 completes the energy release, the first capacitor 112 supplies power to the DC-DC converter 132. After the first capacitor 112 releases energy to a certain extent, the power amplifier transistor is turned off, and the remaining electrical energy of the first capacitor 112 is consumed through the internal resistance of the power supply circuit.

[0090] During the power-down process, if the drain voltage of the second conversion circuit 13 suddenly drops due to overload or short circuit, etc., the energy storage circuit 11 will supply power to the first conversion circuit 12 and the drain at the same time. Regarding the voltage polarity at both ends of the energy storage circuit 11, when the second capacitor 113 still stores electrical energy, the first gating unit 111 will be cut off. At this time, the second capacitor 113 supplies power to the drain and the first conversion circuit 12. When the electrical energy stored in the second capacitor 113 is released to a certain extent, the voltage output by the energy storage circuit 11 cannot keep the power amplifier transistor conducting. At this time, the power amplifier transistor is cut off, and the second capacitor 113 only supplies power to the first conversion circuit 12; when the electrical energy of the second capacitor 113 is completely released, the first gating unit 111 will be cut off. After the electrical energy of the second capacitor 113 is completely released, the first conversion circuit 12 can be powered through the first capacitor 112 until the gate power-down is completed. That is to say, during the power-down process, the first conversion circuit 12 can still obtain the relative series voltage through the first capacitor 112 and the second capacitor 113, so that the power supply circuit can still maintain a stable power-down timing, improving the reliability of the power supply circuit.

[0091] It should be noted that the setting forms of the DC-DC converter 132 and the first gating unit 111 are diverse. Exemplarily, as Figures 6a to 6b shown in the embodiment, the DC-DC converter 132 and the first gating unit 111 are set in the form of an independent circuit; or, for example, through the DC-DC conversion device, the DC-DC converter 132 and the first gating unit 111 are provided inside the DC-DC conversion device, and the DC-DC conversion device is connected between the drain and the first capacitor 12 to generate the drain voltage, etc. The embodiments of the present application do not limit this.

[0092] It should be noted that the specific form of the first DC-DC conversion circuit 131 is diverse. It can be the following embodiments or other embodiments. The embodiments of the present application do not limit this.

[0093] In one embodiment, the first DC-DC conversion circuit 131 is a boost chopper circuit (i.e., a boost circuit).

[0094] In one embodiment, the first DC-DC conversion circuit 131 is an integrated boost circuit and is provided with an enable terminal.

[0095] Please refer to Figure 7 , Figure 7 which is the circuit schematic diagram of the power supply circuit provided by another embodiment of the present application. In one embodiment, the first DC-DC conversion circuit 131 includes but is not limited to a first switch unit 134, a second switch unit 135, a third switch unit 136, a fourth switch unit 137, and a transformer 138.

[0096] The first switch unit 134 and the second switch unit 135 are connected in series to form a first rectifying arm. The first rectifying arm is connected between the negative electrode of the first capacitor 112 (i.e., Figure 7 the second terminal of the first capacitor 112 in

[0097] ) and the drain. The control electrodes of the first switch unit 134 and the second switch unit 135 are respectively used to receive an enabling signal.

[0098] The third switch unit 136 and the fourth switch unit 137 are connected in series to form a second rectifying arm. The second rectifying arm is connected in parallel with the first rectifying arm to form a rectifier bridge unit. The control electrodes of the third switch unit 136 and the fourth switch unit 137 are respectively used to receive an enabling signal. Wherein, the rectifier bridge unit is used to output a drain voltage after receiving the enabling signal. Figure 7 The low-voltage side of the transformer 138 is connected between the series connection node of the first rectifying arm and the positive electrode of the first capacitor 112 (i.e.,

[0099] the first terminal of the first capacitor 112 in

[0100] ), and the high-voltage side of the transformer 138 is connected between the series connection node of the second rectifying arm and the positive electrode of the first capacitor 112. The transformer 138 is used to transform the supply voltage to obtain a drain voltage. Specifically, each of the switch units includes a diode structure (such as the parasitic diode structure of a MOS transistor, the diode structure of a controlled diode). The diode structures in the above-mentioned switch units form a first gating unit 111, which forms a bypass through its own control and the enabling signal. When the power is turned on, the first switch unit 134, the second switch unit 135, the third switch unit 136, and the fourth switch unit 137 form a current path through their own parasitic diodes, so that the supply voltage can be conducted to the first conversion circuit 12. And, in this process, the first capacitor 112 can store energy through the supply voltage. When the first conversion circuit 12 outputs a gate voltage, the first switch unit 134 and the fourth switch unit 137 are turned on to form a bypass, so that the supply voltage is input to the transformer to generate a drain voltage. At this time, the second capacitor 113 stores energy based on the drain voltage.After the power supply is powered off, the first capacitor 112 supplies power to the drain and the first conversion circuit 12 together with the transformer 138 through the only path formed by the first switch unit 134 and the fourth switch unit 137, and the second capacitor 113 supplies power to the drain and the first conversion circuit 12. After the first capacitor 112 and the second capacitor 113 release energy to a certain extent, the drain voltage output by the power supply circuit is less than the conduction voltage of the power amplifier tube, and the power amplifier tube is cut off. At this time, the first capacitor 112 supplies power to the first conversion circuit 12 through the first switch unit 134, the fourth switch unit 137 and the transformer 138, and the second capacitor 113 continues to supply power to the first conversion circuit 12 to supply power to the first conversion circuit 12 in the way of series voltage. After the second capacitor 113 completes energy release, the first capacitor 112 continues to supply power to the first conversion circuit 12 through the first switch unit 134, the fourth switch unit 137 and the transformer 138. After the first capacitor 112 releases energy to a certain extent, the power amplifier tube is turned off.

[0101] It should be noted that the specific forms of the first switch unit 134, the second switch unit 135, the third switch unit 136, and the fourth switch unit 137 here are diverse. Exemplarily, such as MOS transistors, JFET transistors, etc., and the embodiments of the present application do not limit this.

[0102] It should be noted that the coupling methods between the high-voltage side and the low-voltage side here are specifically diverse, and can be, for example, Figure 7 the same-name coupling method shown, or the coupling method of the opposite name end and the same-name end to each other, and the embodiments of the present application do not limit this.

[0103] It should be noted that Figure 7 In the embodiments shown, in addition to the form of the rectifier arm described above, other rectifier arm forms can also be used. Exemplarily, one or more of the above-mentioned first switch unit 134, second switch unit 135, third switch unit 136, and fourth switch unit 137 can be a switching circuit formed by a unidirectional controllable switch device, a diode, and a resistor, and the diode and the resistor form a first selection unit 111 and are connected in parallel with the corresponding unidirectional controllable switch device.

[0104] Taking the first switch unit 134 as an example, the diode is in series with the resistor, the series circuit is in parallel with the unidirectional controllable switch device, and the control electrode of the unidirectional controllable switch device is used to receive the enable signal. When the unidirectional controllable switch device is not enabled, the current flows through the series circuit. When the unidirectional controllable switch device is enabled, the current flows through the unidirectional controllable switch device, so as to cooperate with the fourth switch unit 137 to form a bypass.

[0105] Please refer to Figures 8a to 8d , Figures 8a to 8dThe circuit schematic diagram of the power supply circuit provided for another embodiment of this application. In one embodiment, the power supply circuit further includes, but is not limited to, an enable control circuit 14.

[0106] The enable control circuit 14 is connected to the gate and the second conversion circuit 13. The enable control circuit 14 is used to trigger the gate voltage and output an enable signal to the second conversion circuit 13.

[0107] Specifically, see Figures 8a to 8d , the input end of the enable control circuit 14 is connected to the gate, and the output end of the enable control circuit 14 is connected to the enable end of the second conversion circuit 13. After the first conversion circuit 12 outputs the gate voltage, the gate voltage will also be input to the enable control circuit 14 at the same time. After obtaining the gate voltage, the enable control circuit 14 outputs an enable signal to the enable end of the second conversion circuit 13.

[0108] It should be noted that the specific form of the enable control circuit 14 here is diverse. It can be the following embodiments or other embodiments, and the embodiments of this application do not limit this.

[0109] In one embodiment, the enable control circuit 14 includes a sampling circuit, and uses the sampling signal obtained by the sampling circuit as the enable signal and outputs it to the enable end of the second conversion circuit 13.

[0110] In one embodiment, the enable control circuit 14 includes a resistor and a switching device, and a switching circuit is formed by connecting the resistor and the switching device in series. The control electrode of the switching device is connected to the gate.

[0111] It should be noted that the specific form of the first conversion circuit 12 here is diverse. It can be the following embodiments or other embodiments, and the embodiments of this application do not limit this.

[0112] In one embodiment, the first conversion circuit 12 is a Buck bucking circuit.

[0113] Please refer to Figure 9 , Figure 9 The circuit schematic diagram of the power supply circuit provided for another embodiment of this application. In one embodiment, the first conversion circuit 12 includes, but is not limited to, an isolation circuit 121 and a second DC-DC conversion circuit 122. The isolation circuit 121 is respectively connected to the energy storage circuit 11 and the drain, and the second DC-DC conversion circuit 122 is respectively connected to the isolation circuit 121 and the gate.

[0114] It should be noted that the specific form of the isolation circuit 121 here is diverse. Exemplarily, such as an optocoupler isolation circuit; or based on transformer coupling, based on transformer coupling and the second DC-DC conversion circuit 122, so that the voltage input to the first conversion circuit 12 is stepped down twice to obtain the gate voltage, etc. The embodiments of the present application do not limit this.

[0115] In the embodiments of the present application, by setting an isolation circuit to isolate the energy storage circuit, the second conversion circuit or external interference from the second DC-DC conversion circuit, the interference received by the second DC-DC conversion circuit is reduced, the stability of the gate voltage output is improved, the power-on timing and power-off timing of the power amplifier tube are ensured, and the probability of the power amplifier tube being burned out is reduced.

[0116] To achieve the above object, a second aspect of the embodiments of the present application provides a power supply board for a power amplifier tube, and the power supply board includes the power supply circuit described in the first aspect above.

[0117] To achieve the above object, a third aspect of the embodiments of the present application proposes a base station power supply device, and the base station power supply device includes the power supply board described in the second aspect above.

[0118] The embodiments described in the embodiments of the present application are to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art know that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0119] Those skilled in the art can understand that the technical solutions shown in the figure do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figure, or combine certain steps, or different steps.

[0120] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0121] In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the relationship between related objects and indicates that there can be three relationships. For example, A and / or B can indicate the cases of A existing alone, A and B existing simultaneously, and B existing alone. Here, A and B can be singular or plural. The character " / " generally indicates an "or" relationship between the related objects before and after. "At least one of the following" and its similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, and c can mean: a existing alone, b existing alone, c existing alone, a and b existing simultaneously, a and c existing simultaneously, b and c existing simultaneously, or a, b, and c existing simultaneously, where a, b, and c can be single or multiple.

[0122] In the embodiments of the present application, "indicating" can include direct indication and indirect indication, and can also include explicit indication and implicit indication. If the information indicated by a certain piece of information is called the information to be indicated, then in the specific implementation process, there can be many ways to indicate the information to be indicated. For example, but not limited to, the information to be indicated can be directly indicated, such as indicating the information to be indicated itself or the index of the information to be indicated, etc. It is also possible to indirectly indicate the information to be indicated by indicating other information, where there is an associated relationship between the other information and the information to be indicated. It is also possible to only indicate a part of the information to be indicated, while the other parts of the information to be indicated are known or pre-agreed. For example, it is also possible to achieve the indication of specific information by relying on the arrangement order of each piece of information pre-agreed (such as protocol regulations), thereby reducing the indication overhead to a certain extent.

[0123] In the embodiments of the present application, each term and English abbreviation are exemplary examples given for the convenience of description and should not constitute any limitation to the present application. The present application does not exclude the possibility of defining other terms in existing or future protocols that can achieve the same or similar functions.

[0124] In the embodiments of the present application, the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", and "third" can explicitly or implicitly include one or more of such features.

[0125] The above-described embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but should not be construed as a limitation to the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application.

Claims

1. A power supply circuit for a power amplifier tube, characterized in that, It includes an energy storage circuit, a first conversion circuit, and a second conversion circuit. Among them, the energy storage circuit is used to conduct the supply voltage; the first conversion circuit is respectively connected to the energy storage circuit, the drain of the power amplifier tube, and the gate of the power amplifier tube. After obtaining the supply voltage from the energy storage circuit, it outputs a gate voltage to the gate; the second conversion circuit is respectively connected to the energy storage circuit and the drain of the power amplifier tube. After receiving an enable signal, it outputs a drain voltage to the drain based on the supply voltage. The enable signal is generated after the gate voltage is output; the energy storage circuit is further used to form a bypass after the drain voltage is output, so that the drain voltage and the supply voltage form a series voltage, and the series voltage is input into the first conversion circuit.

2. The power supply circuit according to claim 1, wherein The energy storage circuit includes: a first gating unit, which is used to conduct the supply voltage and form a bypass after the drain voltage is output, so that the drain voltage and the supply voltage form the series voltage; a first capacitor, one end of the first capacitor is connected to the second conversion circuit, and it is used to store energy based on the supply voltage after the first gating unit forms a bypass, and release energy to the first conversion circuit after the drain voltage is powered on; a second capacitor, which is connected to the drain, and is used to store energy based on the drain voltage, and release energy to the first conversion circuit after the drain voltage is powered on.

3. The power supply circuit according to claim 2, characterized in that, The first gating unit, the positive electrode of the second capacitor, and the input end of the first conversion circuit are respectively connected to the drain; The first gating unit is one of the following: a diode, a MOS switch tube, a switching switch, a gating circuit, or a buck-boost circuit.

4. The power supply circuit according to claim 2, wherein The second conversion circuit includes: a DC-DC converter, which is connected between the first capacitor and the first gating unit, and the DC-DC converter outputs the drain voltage to the drain.

5. The power supply circuit according to claim 2, wherein The second conversion circuit includes a first DC-DC conversion circuit. The input end of the first DC-DC conversion circuit is connected to the first capacitor, and the output end of the first DC-DC conversion circuit is connected to the drain.

6. The power supply circuit according to claim 1, characterized in that, It further includes an enable control circuit, which is connected between the gate and the second conversion circuit, and is used to trigger the gate voltage and output the enable signal to the second conversion circuit.

7. The power supply circuit according to claim 1, wherein The first conversion circuit includes an isolation circuit and a second DC-DC conversion circuit. The isolation circuit is respectively connected to the energy storage circuit and the drain, and the second DC-DC conversion circuit is respectively connected to the isolation circuit and the gate.

8. The power supply circuit according to claim 5, wherein The first DC-DC conversion circuit includes: a first switch unit and a second switch unit. The first switch unit and the second switch unit are connected in series to form a first rectifying arm. The first rectifying arm is connected between the negative electrode of the first capacitor and the drain. The control electrodes of the first switch unit and the second switch unit are respectively used to receive the enable signal; A third switching unit and a fourth switching unit, the third switching unit and the fourth switching unit are connected in series to form a second rectifying arm, and the second rectifying arm is connected in parallel with the first rectifying arm to form a rectifier bridge unit. The control electrodes of the third switching unit and the fourth switching unit are respectively used to receive the enable signal. Wherein, the rectifier bridge unit is used to output the drain voltage after receiving the enable signal; A transformer, the low-voltage side of the transformer is connected between the series node of the first rectifying arm and the positive electrode of the first capacitor, and the high-voltage side of the transformer is connected between the series node of the second rectifying arm and the positive electrode of the first capacitor. The transformer is used to transform the supply voltage to obtain the drain voltage.

9. A power supply board for a power amplifier tube, characterized in that, The power supply board includes the power supply circuit according to any one of claims 1 to 8.

10. A base station power supply device, characterized in that, The base station power supply device includes the power supply board according to claim 9.

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