Negative voltage power supply circuit and electronic system

Abstract

The application provides a negative voltage power supply circuit, comprising an inverting charge pump module, a negative voltage stabilizing module and an output adjusting module; the inverting charge pump module is connected with a positive voltage power supply and is used for generating a negative voltage power supply by inverting the positive voltage power supply; the negative voltage stabilizing module is connected with an output end of the inverting charge pump module and is used for stabilizing the voltage value of the negative voltage power supply at a set negative value; and the output adjusting module is connected with an output end of the negative voltage stabilizing module and is used for outputting the voltage value of the negative voltage power supply after adjusting the voltage value from the set negative value to a target negative value. The negative voltage power supply circuit provided by the application solves the problem that the output negative voltage is unstable and the voltage value is not adjustable in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power electronics, in particular to a negative voltage power supply circuit and an electronic system. BACKGROUND

[0002] At present, when the radio frequency front-end devices (such as power amplifiers, low noise amplifiers, etc.) are working, they are generally powered by a direct current voltage source. Most of the power supply of the radio frequency front-end devices adopts positive voltage power supply, but there are also many negative voltage power supplies. For example, in the power amplifier accelerated dynamic life experiment, negative voltage power supply is often used.

[0003] However, the existing negative voltage power supply circuit generally has simple structure and single function, and has the problems of unstable output negative voltage and unadjustable voltage value, which cannot meet the requirements of providing negative voltage power supply for the power amplifier accelerated dynamic life experiment. In view of this, how to provide a negative voltage power supply circuit that meets the power supply requirements is an urgent technical problem for those skilled in the art. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a negative voltage power supply circuit and an electronic system, which can solve the problem of unstable output negative voltage and unadjustable voltage value of the existing negative voltage power supply circuit.

[0005] To achieve the above-mentioned purposes and other related purposes, the present application provides a negative voltage power supply circuit, which comprises: an inverting charge pump module, a negative voltage stabilizing module and an adjusting output module.

[0006] The inverting charge pump module is connected to a positive voltage power supply, and is used to generate a negative voltage power supply by inverting the positive voltage power supply;

[0007] The negative voltage stabilizing module is connected to the output end of the inverting charge pump module, and is used to stabilize the voltage value of the negative voltage power supply at a set negative value;

[0008] The adjusting output module is connected to the output end of the negative voltage stabilizing module, and is used to output the voltage value of the negative voltage power supply after adjusting it from the set negative value to a target negative value.

[0009] Optionally, the negative voltage stabilizing module comprises a negative voltage linear stabilizer.

[0010] Optionally, the negative voltage stabilizing module further comprises a voltage reference source connected to the output end of the negative voltage linear stabilizer, which further stabilizes the negative voltage power supply by working in parallel mode.

[0011] Optionally, the negative voltage stabilizing module further comprises a first prompting unit connected between the output end of the negative voltage linear stabilizer and the reference ground, which is used to prompt when the negative voltage linear stabilizer is working normally.

[0012] Optionally, the adjustable output module includes a voltage divider adjustment unit and an operational amplifier;

[0013] The voltage divider adjustment unit is connected to the output terminal of the negative voltage regulator module, and adjusts the voltage value of the negative voltage power supply from the set negative value to the target negative value by adjusting the voltage division ratio;

[0014] The operational amplifier is connected to the output terminal of the voltage divider adjustment unit and is used to buffer the output of the negative voltage power supply.

[0015] Optionally, the negative voltage power supply circuit further includes a positive voltage regulator module connected to the positive voltage power supply, used to stabilize the voltage value of the positive voltage power supply at a set positive value and provide a positive voltage to the operational amplifier; wherein, the negative voltage regulator module provides a negative voltage to the operational amplifier.

[0016] Optionally, the positive voltage regulator module includes a positive voltage linear regulator.

[0017] Optionally, the positive voltage regulator module further includes a second prompting unit connected between the output terminal of the positive voltage linear regulator and the reference ground, for providing a prompt when the positive voltage linear regulator is working normally.

[0018] Optionally, the negative voltage power supply circuit further includes an input module connected to an input power source for converting the input power source into the positive voltage power source.

[0019] Optionally, the input module includes a surge suppression unit and a MOS transistor unit;

[0020] The surge suppression unit is used to suppress surges in the input power supply and generate a gate control signal, wherein the surge suppression unit adjusts the surge protection range by adjusting the surge threshold value;

[0021] The MOS transistor unit is controlled by the gate control signal and is used to convert the input power supply into the positive voltage power supply.

[0022] The present invention also provides an electronic system comprising: the negative voltage power supply circuit as described above and a device to be powered, wherein the negative voltage power supply circuit provides negative voltage power to the device to be powered.

[0023] Optionally, the device to be powered includes a radio frequency front-end device.

[0024] As described above, the negative voltage power supply circuit and electronic system of the present invention generate a negative voltage power supply through an inverting charge pump module, stabilize the voltage value of the negative voltage power supply at a set negative value through a negative voltage regulator module, and adjust the voltage value of the negative voltage power supply from the set negative value to the target negative value through an adjustment output module. Through the design of the negative voltage regulator module and the adjustment output module, the present invention not only makes the output negative voltage more stable and less prone to fluctuation, but also enables the adjustment of the output negative voltage, making the negative voltage power supply more flexible. In addition, the present invention also implements surge protection through the design of the input module to ensure circuit safety; and the design of the prompt unit makes the voltage supply more intuitive. The negative voltage power supply circuit of the present invention can realize multiple functions, making negative voltage power supply more convenient and safer in practical use, and can meet the needs of providing negative voltage power supply for accelerated dynamic life testing of power amplifiers. Attached Figure Description

[0025] Figure 1 The diagram shown is a circuit block diagram of the negative voltage power supply circuit of the present invention.

[0026] Figure 2 The diagram shown is a specific circuit diagram of the negative voltage power supply circuit of the present invention, wherein the negative voltage regulator module and the positive voltage regulator module do not have a prompt function.

[0027] Figure 3 The diagram shown is another specific circuit diagram of the negative voltage power supply circuit of the present invention, wherein the negative voltage regulator module and the positive voltage regulator module have prompting functions.

[0028] Figure 4 The diagram shown is a circuit block diagram of the electronic system of the present invention.

[0029] Component designation explanation

[0030] 100 Negative Voltage Power Supply Circuit

[0031] 110 Input Module

[0032] 111 Surge Suppression Unit

[0033] 112 MOS transistor unit

[0034] 120 Inverting Charge Pump Module

[0035] 130 Negative Voltage Regulator Module

[0036] 131 Negative Voltage Linear Regulator

[0037] 132 Voltage Reference Source

[0038] 133 First prompt unit

[0039] 140 Adjustable Output Module

[0040] 141 Voltage Divider Regulating Unit

[0041] 142 Operational Amplifier

[0042] 150 Positive Voltage Regulator Module

[0043] 151 Positive Voltage Linear Regulator

[0044] 152 Second prompt unit

[0045] 200 devices to be powered Detailed Implementation

[0046] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0047] Please see Figures 1 to 4 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Although the illustrations only show components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation, the shape, quantity and proportion of each component in the actual implementation can be arbitrarily changed, and the layout of the components may also be more complex.

[0048] like Figures 1-3 As shown, this embodiment provides a negative voltage power supply circuit 100, which includes an inverting charge pump module 120, a negative voltage regulator module 130, and an adjustable output module 140; further, it also includes an input module 110.

[0049] in,

[0050] The input module 110 is connected to the input power supply and is used to convert the input power supply into a positive voltage power supply. While providing a positive voltage power supply to the circuit, it also realizes surge protection of the power supply and improves the safety of the circuit.

[0051] Specifically, such as Figure 2 and Figure 3 As shown, the input module 110 includes a surge suppression unit 111 and a MOSFET unit 112; the surge suppression unit 111 is used to suppress the surge of the input power supply and generate a gate control signal, wherein the surge suppression unit 111 adjusts the surge protection range by adjusting the surge threshold value; the MOSFET unit 112 is controlled by the gate control signal and is used to convert the input power supply into a positive voltage power supply.

[0052] As an example, surge suppression unit 111 is implemented using an LT4367 power protection chip. The VIN terminal (power input terminal) is connected to the input power supply and connected through the first resistor R1. The UV terminal (off control terminal) and the UV terminal (undervoltage input terminal) are connected through the second resistor R2. The OV terminal (overvoltage input terminal) is connected to the UV terminal via the third resistor R3 and to the reference ground via the fourth resistor R4. The GND terminal (ground terminal) is connected to the reference ground. The fault indicator terminal is left floating, the power output terminal (VOUT terminal) is left floating, and the gate control signal is generated at the gate drive terminal (GATE terminal).

[0053] The MOSFET unit 112 is implemented using the SI7942 dual N-channel MOSFET chip. The S1 terminal (first source terminal) and the S2 terminal (second source terminal) are connected to each other. The G1 terminal (first gate terminal) and the G2 terminal (second gate terminal) are connected to each other and then connected to the gate control signal. The two D1 terminals (first drain terminals) are connected to each other and then connected to the input power supply. The two D2 terminals (second drain terminals) are connected to each other and then connected to the reference ground through the first capacitor C1 and the second capacitor C2 in parallel to generate a positive voltage power supply.

[0054] In this example, the LT4367 power protection chip provides surge protection for the input power supply and controls the SI7942 dual N-channel MOSFET chip via a gate control signal, enabling the SI7942 dual N-channel MOSFET chip to convert the input power supply to a positive voltage. During surge protection, the overvoltage threshold and undervoltage threshold can be adjusted by adjusting the resistance values ​​of resistors R1-R4. The overvoltage threshold is the maximum surge threshold value, and the undervoltage threshold is the minimum surge threshold value, thereby adjusting the surge protection range.

[0055] In practical applications, the following settings can be configured: input power supply is +6.5V, first resistor R1 has a resistance of 453KΩ, second resistor R2 has a resistance of 1370KΩ, third resistor R3 has a resistance of 243KΩ, fourth resistor R4 has a resistance of 59KΩ, first capacitor C1 has a capacitance of 100μF, and second capacitor C2 has a capacitance of 47μF; the +6.5V voltage can be converted to +5V voltage using the LT4367 power protection chip and the SI7942 dual N-channel MOSFET chip.

[0056] The reverse charge pump module 120 is connected to a positive voltage power supply and is used to reverse the positive voltage power supply to generate a negative voltage power supply.

[0057] As an example, such as Figure 2 and Figure 3As shown, the inverting charge pump module is implemented using the LTC3261 inverting charge pump chip. The RT terminal (programming input), MODE terminal (logic input), and GND terminal (ground) are all connected to the reference ground. The VIN terminal (power input) and EN terminal (enable) are connected to each other and then connected to the positive voltage power supply, and connected to the reference ground through the third capacitor C3. The C+ terminal (positive terminal of the capacitor) is connected to the C- terminal (negative terminal of the capacitor) through the fourth capacitor C4. The VOUT terminal (power output) is connected to the reference ground through the fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7 respectively, and generates a negative voltage power supply.

[0058] In practical applications, the capacitance values ​​of the third capacitor C3 can be set to 10μF, the fourth capacitor C4 to 1μF, the fifth capacitor C5 to 10μF, the sixth capacitor C6 to 47μF, and the seventh capacitor C7 to 10μF. The +5V voltage can be inverted to -5V voltage using the LTC3261 inverting charge pump chip.

[0059] The negative voltage regulator module 130 is connected to the output terminal of the reverse charge pump module 120 and is used to stabilize the voltage value of the negative voltage power supply at a set negative value.

[0060] Specifically, in one possible implementation, such as Figure 2 As shown, the negative voltage regulator module 130 includes a negative voltage linear regulator 131, which is connected to the output terminal of the reverse charge pump module 120 and is used to stabilize the voltage value of the negative voltage power supply at a set negative value.

[0061] As an example, the negative voltage linear regulator 131 is implemented using the LT3094 negative linear regulator chip; the IN terminal (input terminal) and the EN terminal (enable terminal) are connected to each other and then connected to the negative voltage power supply; the PG terminal (normal power supply terminal) and the PGFB terminal (normal power supply feedback terminal) are left floating; the ILIM terminal (current limiting programming terminal) is connected to the reference ground through the fifth resistor R5; the VIOC terminal (input / output control voltage terminal) is left floating; the SET terminal (setting terminal) is connected to the reference ground through the sixth resistor R6 and the eighth capacitor C8 connected in parallel; the GND terminal (ground terminal) is connected to the reference ground; the OUT terminal (first output terminal) and the OUTS terminal (second output terminal) are connected to each other and then connected to the reference ground through the ninth capacitor C9; at the same time, they are also connected to the reference ground through the seventh resistor R7 and the tenth capacitor C10 and the eleventh capacitor C11 connected in parallel, thus generating a negative voltage power supply with a set negative value.

[0062] In practical applications, the following values ​​can be set: the fifth resistor R5 has a resistance of 7.5KΩ, the sixth resistor R6 has a resistance of 49.9KΩ, the seventh resistor R7 has a resistance of 200Ω, the eighth capacitor C8 has a capacitance of 4.7μF, the ninth capacitor C9 has a capacitance of 10μF, the tenth capacitor C10 has a capacitance of 10μF, and the eleventh capacitor C11 has a capacitance of 100nF. Using the LT3094 negative linear regulator chip, the -5V voltage can be stabilized at -3.3V.

[0063] In another possible implementation, such as Figure 2 As shown, the negative voltage regulator module 130 includes a negative voltage linear regulator 131 and a voltage reference source 132. The negative voltage linear regulator 131 is connected to the output terminal of the inverting charge pump module 120 and is used to stabilize the voltage value of the negative voltage power supply at a set negative value. The voltage reference source 132 is connected to the output terminal of the negative voltage linear regulator 131 and further regulates the negative voltage power supply by operating in parallel mode, thereby improving the stability of the negative voltage power supply.

[0064] As an example, the negative linear regulator 131 is implemented using the LT3094 negative linear regulator chip. The connections of each port of the chip are the same as those described above, and will not be repeated here. The voltage reference source 132 is implemented using the LT6657 reference voltage source chip, with the VIN terminal (input terminal)... The OUT terminal (shutdown control terminal) and the OUT terminal (output terminal) are connected to each other and then connected to the GND terminal (ground terminal) through the twelfth capacitor C12. Finally, they are connected to the OUT terminal of the LT3094 negative linear regulator chip through the seventh resistor R7.

[0065] In practical applications, the capacitance of the twelfth capacitor C12 can be set to 100pF. By making the LT6657 reference voltage source chip work in parallel mode, the negative voltage power supply output by the LT3094 negative linear regulator chip can be further regulated, thereby improving the stability of the negative voltage power supply.

[0066] like Figure 3 As shown, the negative voltage regulator module 130 described in the two implementation methods above may further include a first prompting unit 133, which is connected between the output terminal of the negative voltage linear regulator 131 and the reference ground, and is used to provide a prompt when the negative voltage linear regulator 131 is working normally.

[0067] As an example, the first prompting unit 133 is implemented using a light-emitting diode; at this time, the PG terminal and PGFB terminal of the LT3094 negative linear regulator chip are no longer floating. The PG terminal is connected to the reference ground through the eighth resistor R8 and the ninth resistor R9 connected in series. The PGFB terminal is connected to the OUT terminal through the tenth resistor R10 and then connected to the cathode of the first light-emitting diode D1. It is also connected to the reference ground through the eleventh resistor R11. The anode of the first light-emitting diode D1 is connected to the reference ground through the twelfth resistor R12.

[0068] In practical applications, the following settings can be made: the resistance of the eighth resistor R8 is 200KΩ, the resistance of the ninth resistor R9 is 1.1KΩ, the resistance of the tenth resistor R10 is 450KΩ, the resistance of the eleventh resistor R11 is 50KΩ, and the resistance of the twelfth resistor R12 is 1KΩ. The first LED D1 is driven to light up when the LT3094 negative linear regulator chip is working normally to indicate chip malfunction.

[0069] The output adjustment module 140 is connected to the output terminal of the negative voltage regulator module 130 and is used to adjust the voltage value of the negative voltage power supply from the set negative value to the target negative value before outputting it.

[0070] Specifically, such as Figure 2 and Figure 3 As shown, the output adjustment module 140 includes a voltage divider adjustment unit 141 and an operational amplifier 142. The voltage divider adjustment unit 141 is connected to the output terminal of the negative voltage regulator module 130 and adjusts the voltage value of the negative voltage power supply from the set negative value to the target negative value by adjusting the voltage division ratio. The operational amplifier 142 is connected to the output terminal of the voltage divider adjustment unit 141 and is used to buffer the output of the negative voltage power supply.

[0071] As an example, the voltage divider adjustment unit 141 includes: a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a first adjustable resistor Rh1, a second adjustable resistor Rh2, a thirteenth capacitor C13, and a fourteenth capacitor C14; the thirteenth resistor R13, the first adjustable resistor Rh1, and the fourteenth resistor R14 are connected in series between the output terminal of the negative voltage regulator module 130 and the reference ground; the second adjustable resistor Rh2 and the fifteenth resistor R14 are connected in series between the adjustment terminal of the first adjustable resistor Rh1 and the reference ground; the first terminal of the sixteenth resistor R16 is connected to the adjustment terminal of the second adjustable resistor Rh2; and the second terminal of the sixteenth resistor R16 is connected to the reference ground through the parallel thirteenth capacitor C13 and the fourteenth capacitor C14 to generate a negative voltage power supply with a target negative value.

[0072] In practical applications, the following settings can be configured: the resistance of the thirteenth resistor R13 is 2KΩ, the resistance of the fourteenth resistor R14 is 2KΩ, the resistance of the fifteenth resistor R15 is 2KΩ, the resistance of the sixteenth resistor R16 is 10KΩ, the maximum resistance of the first adjustable resistor Rh1 is 1KΩ, the maximum resistance of the second adjustable resistor Rh2 is 5KΩ, the capacitance of the thirteenth capacitor C13 is 100nF, and the capacitance of the fourteenth capacitor C14 is 100nF. The voltage divider adjustment unit 141 adjusts the voltage division ratio through the first adjustable resistor Rh1 and the second adjustable resistor Rh2, thereby adjusting the voltage value of the negative power supply from the set negative value to the target negative value. Of course, the target negative value and the set negative value can also be equal, which has no substantial impact on this embodiment.

[0073] As an example, operational amplifier 142 is implemented using the LM7321MF op-amp chip. The V+ terminal (positive power supply terminal) is connected to the positive terminal of the power supply, and the V- terminal (negative power supply terminal) is connected to the negative terminal of the power supply. The +IN terminal (non-inverting input terminal) is connected to the second terminal of the sixteenth resistor R16 to connect to a negative voltage power supply with a target negative voltage value. The -IN terminal (inverting input terminal) is connected to the OUT terminal (output terminal) through the seventeenth resistor R17 and the fifteenth capacitor C15 connected in parallel. The OUT terminal is connected to the reference ground through the sixteenth capacitor C16 and generates an output negative voltage through the eighteenth resistor R18. It is then connected to the -IN terminal through the eighteenth resistor R18 and the nineteenth resistor R19.

[0074] In practical applications, the following settings can be made: the resistance of the seventeenth resistor R17 is 100KΩ, the resistance of the eighteenth resistor R18 is 100Ω, the resistance of the nineteenth resistor R19 is 1KΩ, the capacitance of the fifteenth capacitor C15 is 1μF, and the capacitance of the sixteenth capacitor C16 is 1μF. The LM7321MF op-amp chip, as an output negative voltage buffer, can buffer the output of a negative voltage power supply with a voltage value that is negative to the target value.

[0075] Operational amplifier 142 can be powered by an external power supply or an internal power supply, but in order to improve the stability of the power supply, this embodiment uses an internal power supply. At this time, the negative voltage power supply circuit 100 also includes a positive voltage regulator module 150, which is connected to a positive voltage power supply and is used to stabilize the voltage value of the positive voltage power supply at a set positive value and provide a positive voltage to operational amplifier 142, that is, to supply power to the +V terminal of operational amplifier 142 through a positive voltage power supply with a set positive voltage value; wherein, the negative voltage regulator module 130 provides a negative voltage to operational amplifier 142, that is, to supply power to the -V terminal of operational amplifier 142 through a negative voltage power supply with a set negative voltage value.

[0076] Specifically, such as Figure 2 As shown, the positive voltage regulator module 150 includes a positive voltage linear regulator 151.

[0077] As an example, the positive linear regulator 151 is implemented using the LT3045 positive linear regulator chip. The IN terminal (input terminal) and EN terminal (enable terminal) are connected to each other and then connected to the positive voltage power supply and connected to the reference ground through the seventeenth capacitor C17. The PG terminal (normal power supply terminal) and PGFB terminal (normal power supply feedback terminal) are left floating. The ILIM terminal (current limiting programming terminal) is connected to the reference ground through the twentieth resistor R20. The GND terminal (ground terminal) is connected to the reference ground. The SET terminal (setting terminal) is connected to the reference ground through the twenty-first resistor R21 and the eighteenth capacitor C18 connected in parallel. The OUT terminal (first output terminal) and OUTS terminal (second output terminal) are connected to each other and then connected to the reference ground through the nineteenth capacitor C19, generating a positive voltage power supply with a set positive value to power the +V terminal of the operational amplifier 142.

[0078] In practical applications, the following settings can be made: the resistance of the twentieth resistor R20 is 249Ω, the resistance of the twenty-first resistor R21 is 49.9KΩ, the capacitance of the seventeenth capacitor C17 is 4.7μF, the capacitance of the eighteenth capacitor C18 is 4.7μF, and the capacitance of the nineteenth capacitor C19 is 10μF; using the LT3045 positive linear regulator chip, the +5V voltage can be stabilized at +3V.

[0079] Furthermore, such as Figure 3 As shown, the positive voltage regulator module 150 also includes a second prompting unit 152, which is connected between the output terminal of the positive voltage linear regulator 151 and the reference ground, and is used to provide a prompt when the positive voltage linear regulator 151 is working normally.

[0080] As an example, the second prompting unit 152 is implemented using a light-emitting diode; at this time, the PG terminal and PGFB terminal of the LT3045 positive linear regulator chip are no longer floating. The PG terminal is connected to the reference ground through the series-connected resistors R22, R23, and R24. The PGFB terminal is connected to the reference ground through the resistor R25, and is also connected to the OUT terminal through the resistor R26, and then connected to the anode of the second light-emitting diode D2. It is also connected to the reference ground through the parallel-connected capacitors C20 and C21. The cathode of the second light-emitting diode D2 is connected to the reference ground through the resistor R27.

[0081] In practical applications, the following settings can be configured: the resistance of resistor R22 (200KΩ), resistor R23 (0.9KΩ), resistor R24 ​​(1.1KΩ), resistor R25 (49.9KΩ), resistor R26 (402KΩ), resistor R27 (1KΩ), capacitor C20 (10μF), and capacitor C21 (100nF). An error message is displayed by driving the second LED D2 to illuminate when the LT3045 positive linear regulator chip is working normally.

[0082] Correspondingly, such as Figure 4 As shown, this embodiment also provides an electronic system, which includes: a negative voltage power supply circuit 100 as described above and a device to be powered 200. The negative voltage power supply circuit 100 provides negative voltage power to the device to be powered 200. The device to be powered 200 includes radio frequency front-end devices, such as power amplifiers and low-noise amplifiers.

[0083] In summary, the negative voltage power supply circuit and electronic system of this invention generate a negative voltage power supply through an inverting charge pump module, stabilize the voltage value of the negative voltage power supply at a set negative value through a negative voltage regulator module, and adjust the voltage value of the negative voltage power supply from the set negative value to the target negative value through an output adjustment module. Through the design of the negative voltage regulator module and the output adjustment module, this invention not only makes the output negative voltage more stable and less prone to fluctuation, but also enables the adjustment of the output negative voltage, making negative voltage power supply more flexible. Furthermore, this invention also implements surge protection through the input module design, ensuring circuit safety; and the design of the prompt unit makes the voltage supply more intuitive. The negative voltage power supply circuit of this invention can realize multiple functions, making negative voltage power supply more convenient and safer in practical use, and can meet the needs of providing negative voltage power supply for accelerated dynamic life testing of power amplifiers. Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0084] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A negative voltage supply circuit, characterized by, The negative voltage power supply circuit comprises an inverting charge pump module, a negative voltage stabilizing module and an output adjusting module. The inverting charge pump module is connected to a positive voltage power supply and is configured to generate a negative voltage power supply by inverting the positive voltage power supply. The negative voltage stabilizing module is connected to an output end of the inverting charge pump module and is configured to stabilize the voltage value of the negative voltage power supply at a set negative value. The output adjusting module is connected to an output end of the negative voltage stabilizing module and is configured to output the voltage value of the negative voltage power supply after adjusting the voltage value from the set negative value to a target negative value. The output adjusting module comprises a voltage dividing adjusting unit and an operational amplifier. The voltage dividing adjusting unit is connected to the output end of the negative voltage stabilizing module and is configured to adjust the voltage value of the negative voltage power supply from the set negative value to the target negative value by adjusting a voltage dividing ratio. The operational amplifier is connected to an output end of the voltage dividing adjusting unit and is configured to output the negative voltage power supply.

2. The negative voltage supply circuit of claim 1, wherein, The negative voltage stabilizing module comprises a negative voltage linear stabilizer.

3. The negative voltage supply circuit of claim 2, wherein, The negative voltage stabilizing module further comprises a voltage reference source connected to an output end of the negative voltage linear stabilizer and configured to further stabilize the negative voltage power supply by working in a parallel mode.

4. The negative voltage supply circuit according to claim 2 or 3, characterized in that, The negative voltage stabilizing module further comprises a first prompting unit connected between the output end of the negative voltage linear stabilizer and a reference ground and configured to prompt when the negative voltage linear stabilizer is working normally.

5. The negative voltage supply circuit of claim 1, wherein, The negative voltage power supply circuit further comprises a positive voltage stabilizing module connected to the positive voltage power supply and configured to stabilize the voltage value of the positive voltage power supply at a set positive value and provide a positive voltage for the operational amplifier, wherein the negative voltage stabilizing module provides a negative voltage for the operational amplifier.

6. The negative voltage supply circuit of claim 5, wherein, The positive voltage stabilizing module comprises a positive voltage linear stabilizer.

7. The negative voltage supply circuit of claim 6, wherein, The positive voltage stabilizing module further comprises a second prompting unit connected between the output end of the positive voltage linear stabilizer and the reference ground and configured to prompt when the positive voltage linear stabilizer is working normally.

8. The negative voltage supply circuit of claim 1, wherein, The negative voltage power supply circuit further comprises an input module connected to an input power supply and configured to convert the input power supply into the positive voltage power supply.

9. The negative voltage supply circuit of claim 8, wherein, The input module comprises a surge suppression unit and a MOS tube unit. The surge suppression unit is configured to suppress surges of the input power supply and generate a gate control signal, wherein the surge suppression unit adjusts a surge protection range by adjusting a surge threshold value. The MOS tube unit is controlled by the gate control signal and is configured to convert the input power supply into the positive voltage power supply.

10. An electronic system, characterized by The electronic system comprises the negative voltage power supply circuit according to any one of claims 1-9 and a device to be powered, wherein the negative voltage power supply circuit is configured to supply negative voltage to the device to be powered.

11. The electronic system of claim 10, wherein, The device to be powered comprises a radio frequency front-end device.

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