Protecting circuit of power amplifier, adjusting method of supplying voltage and electronic device

Abstract

To provide a protecting circuit of a power amplifier, an adjusting method of supplying voltage, and an electronic device.SOLUTION: A protecting circuit of a power amplifier includes: a power detecting module which detects a power voltage of a power supply and generates a trigger signal when the level of the power voltage is less than a predetermined level; a delay-controlling module which is electrically connected to the power detecting module, receives the trigger signal, and is triggered by the trigger signal to generate a plurality of delay signals; and a voltage transforming module which is electrically connected to the power supply and the delay-controlling module, receives the delay signals, and is used to transform the power voltage of the power supply into a plurality of supplying voltages. The voltage transforming module sequentially inputs the supplying voltages to the power amplifier according to the delay signals. Therefore, the power amplifier is not powered off at a predetermined timing when the power supply is abnormal, thereby avoiding the damage of the power amplifier.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a protection circuit, a voltage adjustment method, and an electronic device, and particularly to a protection circuit for a power amplifier, a supply voltage adjustment method, and an electronic device.

Background Art

[0002] In the communication field, a power amplifier (PA) used in a remote radio unit (RRU) needs to be driven by a plurality of supply voltages. The plurality of supply voltages of the power amplifier need to drive and turn off different components in the power amplifier according to the order and interval time specified in the product specification. However, when the power supply of the remote radio unit is turned off due to an abnormality in the power supply system, the power amplifier cannot be turned off at the timing specified in the product specification and may burn out.

[0003] In view of this, the development of a protection circuit for a power amplifier, a method for adjusting a supply voltage, and an electronic device that can ensure that the power amplifier is turned on or off according to a predetermined order and interval time has become a target of research and development value for related operators.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Therefore, an object of the present invention is to provide a protection circuit for a power amplifier, a supply voltage adjustment method, and an electronic device that detect a power supply voltage and input a supply voltage to the power amplifier at a predetermined timing by a delay control module when the power supply abnormally loses power.

Means for Solving the Problems

[0005] According to an embodiment of the structural aspect of the present invention, there is provided a power supply detection module electrically connected to a power supply, detecting the power supply voltage of the power supply, and generating a trigger signal when the power supply voltage becomes smaller than a preset level; a delay control module electrically connected to the power supply detection module, receiving the trigger signal, and generating a plurality of delay signals triggered by the trigger signal; and a voltage conversion module electrically connected to the power supply and the delay control module, receiving the delay signal, and converting the power supply voltage of the power supply into a plurality of supply voltages. The voltage conversion module provides a protection circuit for a power amplifier that sequentially inputs the supply voltage to the power amplifier based on the delay signal.

[0006] According to an embodiment of the method aspect of the present invention, there is provided a supply voltage adjustment method including a power supply detection step of driving a power supply detection module to detect the power supply voltage of a power supply and generating a trigger signal when the power supply voltage becomes smaller than a preset level; a delay control step of driving a delay control module to generate a plurality of delay signals based on the trigger signal; a voltage conversion step of driving a voltage conversion module to convert the power supply voltage of the power supply into a plurality of supply voltages; and a supply voltage input step of driving the voltage conversion module to sequentially input these supply voltages to a power amplifier based on these delay signals.

[0007] According to another embodiment of the structural aspect of the present invention, a field programmable logic gate array, a power detection module electrically connected to a power supply, detecting the power supply voltage of the power supply, and generating a trigger signal when the power supply voltage becomes smaller than a preset level, a power detection module electrically connected to the power supply, detecting the power supply voltage of the power supply, and generating a trigger signal when the power supply voltage becomes smaller than a preset level, a delay control module electrically connected to the field programmable logic gate array and the power detection module, receiving the trigger signal, and generating a plurality of delay signals triggered by the trigger signal, a voltage conversion module electrically connected to the power supply and the delay control module, receiving these delay signals, and converting the power supply voltage of the power supply into a plurality of supply voltages, a protection circuit including the above, and a power amplifier including a plurality of supply voltage pins electrically connected to the voltage conversion module and receiving the plurality of supply voltages, and being driven by the plurality of supply voltages. The voltage conversion module provides an electronic device that sequentially inputs the supply voltages to the supply voltage pins based on the delay signals.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

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Figure 7

Figure 8A

Figure 8B

Figure 8C

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Figure 10

Embodiments for Carrying Out the Invention

[0009] Please refer to FIG. 1. It is a block schematic diagram showing a protection circuit 100 of a power amplifier 20 according to a first embodiment of the present invention. The protection circuit 100 of the power amplifier 20 includes a power supply detection module 110, a delay control module 120, and a voltage conversion module 130. The power supply detection module 110 is electrically connected to the power supply 10 and detects the power supply voltage Vp1 of the power supply 10. When the power supply voltage Vp1 becomes smaller than a preset level, the power supply detection module 110 generates a trigger signal TR. The delay control module 120 is electrically connected to the power supply detection module 110 and receives the trigger signal TR. The delay control module 120 is triggered by the trigger signal TR to generate a plurality of delay signals DL1, DL2, DL3, DL4. The voltage conversion module 130 is electrically connected to the power supply 10 and the delay control module 120. The voltage conversion module 130 is used to receive the delay signals DL1, DL2, DL3, DL4 and convert the power supply voltage Vp1 of the power supply 10 into a plurality of supply voltages Vs1, Vs2, Vs3, Vs4. The voltage conversion module 130 inputs the supply voltages Vs1, Vs2, Vs3, Vs4 to a plurality of supply voltage pins of the power amplifier 20 in sequence based on the delay signals DL1, DL2, DL3, DL4.

[0010] Please refer to FIGS. 1 and 2 together. FIG. 2 is a circuit schematic diagram showing the power detection module 110 of the protection circuit 100 of the power amplifier 20 in FIG. 1. The power detection module 110 includes a resetter 112 and an optocoupler 114. The resetter 112 is electrically connected to the power supply 10 and detects the power supply voltage Vp1 of the power supply 10 to generate a reset signal Rs. The optocoupler 114 is electrically connected between the resetter 112 and the delay control module 120, and the optocoupler 114 receives the reset signal Rs and converts it into a trigger signal TR. Specifically, the resetter 112 may be a reset integrated circuit (reset IC). The detection pin (i.e., pin SENSE) of the resetter 112 is connected to the power supply voltage Vp1, and the output pin (i.e., pin RST) is connected to the power supply voltage Vp1 through two resistors (not shown). When the detection pin (i.e., pin SENSE) of the resetter 112 detects that the power supply voltage Vp1 is smaller than the default value, the output pin (i.e., pin RST) of the resetter 112 outputs the reset signal Rs. Since the high and low voltage levels between the resetter 112 and the delay control module 120 are different, the reset signal Rs output from the resetter 112 cannot be directly used as the trigger signal TR of the delay control module 120. Therefore, by providing the optocoupler 114 between the resetter 112 and the delay control module 120, the high and low voltage levels between the resetter 112 and the delay control module 120 can be adjusted.

[0011] Furthermore, the first pin of the optocoupler 114 is connected to the power supply voltage Vp1 through a resistor, the second pin is connected to the pin RST of the resetter 112 through a resistor, and receives the reset signal Rs. The third pin resistor of the optocoupler 114 is connected to the ground terminal through a resistor, and the fourth pin is connected to the delay control module 120 through a resistor and is used to transmit the trigger signal TR to the delay control module 120. Also, the fourth pin is connected in parallel with a resistor and a capacitor. As can be seen from FIG. 2, when the reset signal Rs is at a low potential, the trigger signal TR is also at a low potential.

[0012] Please refer to FIGS. 1 and 4 together. FIG. 3 is a circuit schematic diagram showing the delay control module 120 of the protection circuit 100 of the power amplifier 20 in FIG. 1, and FIG. 4 is a block schematic diagram showing the voltage conversion module 130 of the protection circuit 100 of the power amplifier 20 in FIG. 1. Specifically, the delay control module 120 may be a Complex Programmable Logic Device (CPLD). In FIG. 4, the voltage conversion module 130 may include three DC-DC converters 131, 132, 133 and one level shifter 134, but the present invention is not limited thereto. For example, the supply voltage Vs1 of the power amplifier 20 may be a 5-volt bias voltage, the supply voltage Vs2 may be a -7.5-volt gate voltage, the supply voltage Vs3 may be a -3.4-volt gate-source voltage, the supply voltage Vs4 may be a 28-volt drain voltage, the driving order among the supply voltages Vs1, Vs2, Vs3, Vs4 is in turn the supply voltages Vs1, Vs2, Vs3, Vs4, and its turn-off order is in turn the supply voltages Vs4, Vs3, Vs2, Vs1, but the present invention is not limited thereto. In FIG. 3, the pin VDD of the delay control module 120 is connected to a capacitor and a 1.8-volt voltage, the pin GPIO#3 is used to detect the trigger signal TR, the pins GPIO#4, GPIO#5 are connected to the ground terminal via resistors, and when the trigger signal TR and the pin GPIO#5 are simultaneously at the high state potential, the pins GPIO#6, GPIO#7, GPIO#8, GPIO#9 of the delay control module 120 output delay signals DL1, DL2, DL3, DL4 respectively to drive the power amplifier 20 to turn on, and when either the trigger signal TR or the pin GPIO#5 is at the low potential, the pins GPIO#6, GPIO#7, GPIO#8, GPIO#9 of the delay control module 120 output delay signals DL1, DL2, DL3, DL4 respectively to drive the power amplifier 20 to turn off. Specifically, whether to turn on the delay control module 120 at the high state potential or the low state potential is set according to its specifications, but the present invention is not limited thereto. The delay signals DL1, DL2, DL3, DL4 are respectively used to control the driving order of the supply voltages Vs1, Vs2, Vs3, Vs4.Accordingly, the protection circuit 100 of the power amplifier 20 of the present invention ensures that the supply voltages Vs1, Vs2, Vs3, Vs4 in the power amplifier 20 are turned off at a predetermined timing when the power supply 10 abnormally loses power, and thus can avoid burnout of the power amplifier 20.

[0013] In other embodiments of the present invention, the DC-DC converter and the level shifter may be replaced with each other or changed to other voltage conversion circuits, but the present invention is not limited thereto.

[0014] Please refer to FIGS. 1, 4 and 5 together. FIG. 5 is a circuit schematic diagram showing the DC-DC converter 131 of the voltage conversion module 130 of the protection circuit 100 of the power amplifier 20 in FIG. 4. In FIG. 5, the DC-DC converter 131 may include a voltage source Vp2, a diode D1, and a step-down circuit 1312. The diode D1 includes an anode terminal a and a cathode terminal b, and the anode terminal a is electrically connected to the voltage source Vp2. The voltage source Vp2 is connected to the step-down circuit 1312 via the diode D1, a ferrite bead B1, and a capacitor. The step-down circuit 1312 is electrically connected to the cathode terminal b of the diode D1 and is used to convert the voltage source Vp2 into a supply voltage Vs1, where the supply voltage Vs1 is greater than zero. Specifically, the voltage source Vp2 is a 12-volt voltage required for the power supply 10 to be converted to the step-down circuit 1312 by an additional conversion circuit (not shown). The pin BS and the pin LX of the step-down circuit 1312 are connected to each other via a capacitor, the pin GND is grounded, the pin IN receives the voltage source Vp2 through the diode D1, the pin EN detects a delay signal DL1, and when the delay signal DL1 is at a high state potential, the voltage source Vp2 is converted into a 5-volt supply voltage Vs1 and output from the pin LX. By connecting the resistance values of the resistors R1 and R2 of the pin FB, the output voltage can be adjusted to the desired supply voltage Vs1. The protection circuit 100 of the power amplifier 20 of the present invention can avoid the supply voltage Vs1 generated by the step-down circuit 1312 being rapidly consumed to zero along with the power failure of the voltage source Vp2 when the power supply 10 has an abnormal power failure by connecting a diode D1 between the voltage source Vp2 and the supply voltage Vs1 of the DC-DC converter 131.

[0015] Please refer to FIGS. 1, 4 and 6 together. FIG. 6 is a circuit schematic diagram showing the DC-DC converter 132 of the voltage conversion module 130 of the protection circuit 100 of the power amplifier 20 in FIG. 4. The DC-DC converter 132 may include a voltage source Vp2, a diode D1, a step-down circuit 1322 and an optocoupler 1324. The diode D1 includes an anode terminal a and a cathode terminal b, and the anode terminal a is electrically connected to the voltage source Vp2. The voltage source Vp2 is connected to the step-down circuit 1322 via the diode D1, the ferrite bead B1 and a capacitor. The step-down circuit 1322 is electrically connected to the cathode terminal b of the diode D1 and is used to convert the voltage source Vp2 into a supply voltage Vs2. The optocoupler 1324 is electrically connected to the step-down circuit 1322 and the delay control module 120, receives the delay signal DL2, and the optocoupler 1324 inputs the supply voltage Vs2 to the power amplifier 20 based on the delay signal DL2. Here, the supply voltage Vs2 is less than zero. Specifically, when the supply voltage Vs2 is a negative value, the DC-DC converter 132 can more accurately control the output of the supply voltage Vs2 by the optocoupler 1324 when the DC-DC converter 132 is triggered by the delay signal DL2. In FIG. 6, the first pin of the optocoupler 1324 is connected to the 1.8-volt voltage converted by the power supply 10 via a resistor and a capacitor, the second pin receives the delay signal DL2, the third pin outputs the supply voltage Vs2, and the fourth pin is connected to the pin EN of the step-down circuit 1322 and the 1.8-volt voltage converted by the power supply 10.

[0016] Furthermore, when the power supply 10 supplies power normally, the delay signal DL2 input to the optical coupler 1324 is at a high state potential. The pin EN of the step-down circuit 1322 receives a voltage of 1.8 volts from the optical coupler 1324, and the step-down circuit 1322 is in an enabled state. The pin LX of the step-down circuit 1322 outputs a supply voltage Vs2 of -7.5 volts and transmits it to the power amplifier 20. When the power supply 10 abnormally loses power, the 1.8-volt voltage converted by the power supply 10 stops power supply accordingly. The fourth pin of the optical coupler 1324 is switched from the 1.8-volt voltage to a negative voltage level. The pin EN of the step-down circuit 1322 is in a disabled state, and the pin LX of the step-down circuit 1322 does not output a voltage.

[0017] Please refer to FIGS. 1, 4, and 7 together. FIG. 7 is a circuit schematic diagram showing the DC-DC converter 133 of the voltage conversion module 130 of the protection circuit 100 of the power amplifier 20 in FIG. 4. The DC-DC converter 133 may include a voltage source Vp2, a diode D1, a step-down circuit 1332, and an optical coupler 1334. The diode D1 includes an anode terminal a and a cathode terminal b, and the anode terminal a is electrically connected to the voltage source Vp2. The voltage source Vp2 is connected to the step-down circuit 1332 through the diode D1, the ferrite bead B1, and a capacitor. The step-down circuit 1332 is electrically connected to the cathode terminal b of the diode D1 and is used to convert the voltage source Vp2 into a supply voltage Vs3. The optical coupler 1334 is electrically connected to the step-down circuit 1332 and the delay control module 120, receives the delay signal DL3, and the optical coupler 1334 inputs the supply voltage Vs3 to the power amplifier 20 based on the delay signal DL3. Here, the supply voltage Vs3 is less than zero. In FIG. 7, since the structure and operation of the optical coupler 1334 may be the same as those of the optical coupler 1324, the description is omitted.

[0018] For example, when the power supply 10 supplies power normally, the delay signal DL3 input to the optical coupler 1334 is at a high state potential, the pin EN of the buck circuit 1332 receives a voltage of 1.8 volts from the optical coupler 1334, the buck circuit 1332 is in an enabled state, and the pin LX of the buck circuit 1332 outputs a supply voltage Vs3 of -3.4 volts and transmits it to the power amplifier 20. When the power supply 10 experiences an abnormal power outage, the 1.8-volt voltage converted by the power supply 10 stops power supply accordingly, the fourth pin of the optical coupler 1334 is switched from the 1.8-volt voltage to a negative voltage level, the pin EN of the buck circuit 1332 is in a non-enabled state, and the pin LX of the buck circuit 1332 does not output a voltage.

[0019] Please refer to FIGS. 1, 4, 8A, 8B and 8C together. FIGS. 8A, 8B and 8C are circuit schematic diagrams showing different parts of the level shifter 134 of the voltage conversion module 130 of the protection circuit 100 of the power amplifier 20 in FIG. 4. FIGS. 8A, 8B and 8C are the level shifter 134 of the voltage conversion module 130 of the protection circuit 100 constituting the power amplifier 20 in FIG. 4. The level shifter 134 is electrically connected to the delay control module 120, the power supply 10 and the power amplifier 20, and is used to convert the power supply 10 into the supply voltage Vs4. As can be seen from FIGS. 8A, 8B and 8C, the level shifter 134 includes a connector 1341, an isolated DC converter 1342, a current detector 1343 and a voltage controller 1344. In FIG. 8A, the connector 1341 is connected to the power supply voltage Vp1. The power supply voltage Vp1 is connected to the terminal C via the fuse F1, the variable resistor RV, the diode D2, the transformer CR1 and the capacitor. In FIG. 8B, the power supply voltage Vp1 converted by the transformer CR1 in FIG. 8A is converted from the terminal C into a voltage of 30 volts through the transformer CR2, the capacitor, the inductor, the isolated DC converter 1342 and the current detector 1343. In FIG. 8C, the voltage controller 1344 is used to convert the 30-volt voltage into the required 28-volt voltage of the supply voltage Vs4. The seventh pin of the voltage controller 1344 is connected to the delay control module 120 and is used to receive the delay signal DL4. The voltage controller 1344 outputs the supply voltage Vs4 via the capacitor and the diode D3 based on the delay signal DL4.

[0020] Please refer to FIGS. 1 and 9 together. FIG. 9 is a block schematic diagram showing an electronic device 200 according to a second embodiment of the present invention. The electronic device 200 includes a Field Programmable Gate Array (FPGA) 210, a protection circuit 220, and a power amplifier 230. In the second embodiment, since the operation of the protection circuit 220 of the power amplifier 20 in the first embodiment may be the same, the description thereof is omitted. The electronic device 200 may be a Remote Radio Unit (RRU) in an Open-Radio Access Network (O-RAN) architecture. The electronic device 200 may further include a radio frequency integrated circuit (not shown), a Low Noise Amplifier (LNA) module (not shown), a reception matching circuit (not shown), a reception end (not shown), and a transmission end (not shown), but the present invention is not limited thereto. The radio frequency integrated circuit, the low noise amplifier module, and the power amplifier 230 may be controlled by the field programmable logic gate array 210.

[0021] In addition, the power detection module 110, the delay control module 120, and the voltage conversion module 130 may all be electrically connected to a capacitor (not shown) having a very large capacitance value, so that when an abnormal power outage occurs, the protection circuit 220 can ensure sufficient time to turn off the power amplifier 230 according to a predetermined timing, thereby avoiding damage to the power amplifier 230 in the electronic device 200 and reducing the maintenance cost of the electronic device 200.

[0022] Please refer to FIGS. 1 and 10. FIG. 10 is a flowchart showing a supply voltage adjustment method S100 according to a third embodiment of the present invention. The supply voltage adjustment method S100 includes a power supply detection step S11, a delay control step S12, a voltage conversion step S13, and a supply voltage input step S14. The power supply detection step S11 includes driving a power supply detection module 110 to detect a power supply voltage Vp1 of the power supply 10, and generating a trigger signal TR when the power supply voltage Vp1 becomes smaller than a preset level. The delay control step S12 includes driving a delay control module 120 to generate a plurality of delay signals DL1, DL2, DL3, DL4 based on the trigger signal TR. The voltage conversion step S13 includes driving a voltage conversion module 130 to convert the power supply voltage Vp1 of the power supply 10 into a plurality of supply voltages Vs1, Vs2, Vs3, Vs4. The supply voltage input step S14 includes driving the voltage conversion module 130 to input the supply voltages Vs1, Vs2, Vs3, Vs4 into the power amplifier 20 in sequence based on the delay signals DL1, DL2, DL3, DL4.

[0023] Please refer to FIGS. 2 and 10 together. The power supply detection step S11 may further include driving a resetter 112 to detect the power supply voltage Vp1 of the power supply 10 to generate a reset signal Rs, and driving an optical coupler 114 to receive the reset signal Rs and convert it into a trigger signal TR.

[0024] Please refer to FIGS. 5 and 10 together. The voltage conversion step S13 may further include driving a step-down circuit 1312 to convert a voltage source Vp2 into a supply voltage Vs1 greater than zero.

[0025] Please refer to FIGS. 6 and 10 together. The voltage conversion step S13 may further include driving the buck circuit 1322 to convert the voltage source Vp2 into the supply voltage Vs2, and driving the optical coupler 1324 to input the supply voltage Vs2 to the power amplifier 20 based on the delay signal DL2. Thereby, the supply voltage adjustment method S100 of the present invention automatically controls the on / off timings of the plurality of supply voltages Vs1, Vs2, Vs3, Vs4 of the power amplifier 20 in an extremely short time, shortens the time for manually turning on / off the plurality of supply voltages Vs1, Vs2, Vs3, Vs4, and can also avoid human errors due to manual operations.

[0026] As can be seen from the above embodiments, the protection circuit, supply voltage adjustment method, and electronic device of the power amplifier of the present invention have the following advantages. 1. When the power supply abnormally loses power, it is ensured that the supply voltage in the power amplifier is turned off according to a predetermined timing, and burnout of the power amplifier can be avoided. 2. Damage to the power amplifier in the electronic device is avoided, and thus the maintenance cost of the electronic device is reduced. 3. By automatically controlling the on / off timings of the plurality of supply voltages of the power amplifier within an extremely short time by the timing control module, the time for manually turning on / off the plurality of supply voltages is shortened, and human errors due to manual operations can also be avoided.

[0027] Although the present invention has been disclosed as above based on the embodiments, the embodiments do not limit the present invention, and anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined in the appended claims.

Explanation of Reference Numerals

[0028] 10 Power supply 20, 230 Power amplifier 100, 220 Protection circuit 110 Power supply detection module 112 Resetter 114, 1324, 1334 Optical coupler 120 Delay control module 130 Voltage conversion module 131, 132, 133 DC-DC converters 1312, 1322, 1332 Step-down circuits 134 Level shifter 1341 Connector 1342 Isolated DC converter 1343 Current detector 1344 Voltage controller 200 Electronic device 210 Field programmable logic gate array a Anode terminal b Cathode terminal B1 Ferrite bead BS, EN, FB, IN, GND, GPIO#3, GPIO#4, GPIO#5, GPIO#6, GPIO#7, GPIO#8, GPIO#9, LX, SENSE, RST, VDD pins C Terminal CR1, CR2 Transformers D1, D2, D3 Diodes DL1, DL2, DL3, DL4 Delay signals F1 Fuse TR Trigger signal R1, R2 Resistors Rs Reset signal RV Variable resistor S100 Supply voltage adjustment method S11 Power detection step S12 Delay control step S13 Voltage conversion step S14 Supply voltage input step Vp1 Power supply voltage Vp2 Voltage source Vs1, Vs2, Vs3, Vs4 Supply voltages

Claims

1. a power detection module electrically connected to a power source, for detecting a power source voltage of the power source, and for generating a trigger signal when the power source voltage is lower than a preset level; a delay control module electrically connected to the power detection module, receiving the trigger signal, and triggered by the trigger signal to generate a plurality of delay signals; a voltage conversion module electrically connected to the power supply and the delay control module, for receiving the delay signal and converting the power supply voltage of the power supply into a plurality of supply voltages; Equipped with The voltage conversion module sequentially inputs the supply voltage to a power amplifier according to the delay signal; Power amplifier protection circuit.

2. The power detection module includes: a resetter electrically connected to the power supply and detecting the power supply voltage of the power supply to generate a reset signal; an optical coupler electrically connected between the resetter and the delay control module, the optical coupler receiving the reset signal and converting it into the trigger signal; 2. The power amplifier protection circuit of claim 1, comprising:

3. 2. The power amplifier protection circuit as claimed in claim 1, wherein the delay control module is a complex programmable logic device.

4. 2. The power amplifier protection circuit according to claim 1, wherein the voltage conversion module includes at least one of at least one DC-DC converter and at least one level shifter.

5. The at least one DC-DC converter comprises: A voltage source; a diode including a cathode terminal and an anode terminal electrically connected to the voltage source; a step-down circuit electrically connected to the cathode terminal of the diode for converting the voltage source to one of the supply voltages; Including, said one of said supply voltages is greater than zero; 5. The power amplifier protection circuit according to claim 4.

6. The at least one DC-DC converter comprises: A voltage source; a diode including a cathode terminal and an anode terminal electrically connected to the voltage source; a step-down circuit electrically connected to the cathode terminal of the diode for converting the voltage source to one of the supply voltages; an optical coupler electrically connected to the step-down circuit and the delay control module, the optical coupler receiving one of the delay signals and inputting the one of the supply voltages to the power amplifier based on the one of the delay signals; Including, said one of said supply voltages is less than zero; 5. The power amplifier protection circuit according to claim 4.

7. 5. The power amplifier protection circuit of claim 4, wherein the at least one level shifter is electrically connected to the delay control module, the power supply and the power amplifier, and is used to convert the power supply to at least one of the supply voltages.

8. A power detection step, which includes: driving a power detection module to detect a power supply voltage of a power supply, and generating a trigger signal when the power supply voltage is smaller than a preset level; a delay control step including driving a delay control module to generate a plurality of delay signals based on the trigger signal; a voltage conversion step including driving a voltage conversion module to convert the power supply voltage of the power supply into a plurality of supply voltages; a supply voltage input step, including driving the voltage conversion module to input the supply voltage to a power amplifier in sequence according to the delay signal; 23. A method for regulating a supply voltage, comprising:

9. The power supply detection step includes: driving a resetter to detect the power supply voltage of the power supply and generate a reset signal; driving an optical coupler to receive and convert the reset signal into the trigger signal; Further comprising: the resetter is electrically connected to the optical coupler, the optical coupler being electrically connected to the delay control module; 9. A method for regulating a supply voltage according to claim 8.

10. The voltage conversion step includes: further comprising driving a step-down circuit to convert a voltage source to one of the supply voltages; said one of said supply voltages is greater than zero; 9. A method for regulating a supply voltage according to claim 8.

11. The voltage conversion step includes: driving a step-down circuit to convert a voltage source to one of the supply voltages; driving an optical coupler to input said one of said supply voltages to said power amplifier based on one of said delayed signals; Further comprising: said one of said supply voltages is less than zero; 9. A method for regulating a supply voltage according to claim 8.

12. A field programmable logic gate array; a protection circuit including: a power detection module electrically connected to a power source, detecting a power source voltage of the power source, and generating a trigger signal when the power source voltage is lower than a preset level; a delay control module electrically connected to the field programmable logic gate array and the power detection module, receiving the trigger signal, and generating a plurality of delay signals in response to the trigger signal; and a voltage conversion module electrically connected to the power source and the delay control module, receiving the delay signal, and converting the power source voltage of the power source into a plurality of supply voltages; a power amplifier electrically connected to the voltage conversion module and including a plurality of supply voltage pins for receiving the plurality of supply voltages, the power amplifier being driven by the plurality of supply voltages; Equipped with the voltage conversion module sequentially inputs the supply voltage to the supply voltage pin according to the delay signal; electronic equipment.

13. The power detection module includes: a resetter electrically connected to the power supply and detecting the power supply voltage of the power supply to generate a reset signal; an optical coupler electrically connected between the resetter and the delay control module, the optical coupler receiving the reset signal and converting it into the trigger signal; The electronic device of claim 12 .

14. 13. The electronic device of claim 12, wherein the delay control module is a complex programmable logic device.

15. The electronic device of claim 12 , wherein the voltage conversion module includes at least one of at least one DC-DC converter and at least one level shifter.

16. The at least one DC-DC converter comprises: When one of the supply voltages becomes greater than zero, A voltage source; a diode including a cathode terminal and an anode terminal electrically connected to the voltage source; a step-down circuit electrically connected to the cathode terminal of the diode for converting the voltage source to the one of the supply voltages; When said one of the supply voltages becomes less than zero, The voltage source; the diode including the cathode terminal and the anode terminal electrically connected to the voltage source; a step-down circuit electrically connected to the cathode terminal of the diode for converting the voltage source to the one of the supply voltages; an optical coupler electrically connected to the step-down circuit and the delay control module, the optical coupler receiving one of the delay signals and inputting the one of the supply voltages to the power amplifier based on the one of the delay signals; 16. The electronic device of claim 15, comprising:

17. 16. The electronic device of claim 15, wherein the at least one level shifter is electrically connected to the delay control module, the power source and the power amplifier, and is used to convert the power source to at least one of the supply voltages.

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