Voltage source output circuit and control method

Abstract

The application discloses a voltage source output circuit and a control method, comprising a reference voltage source, a voltage stabilizing module, a switch module and a control signal module. The reference voltage source generates a reference voltage by using a power supply voltage; the voltage stabilizing module is used for stabilizing the reference voltage; the control signal module comprises a delay generation circuit and a comparison unit, the delay generation circuit is used for generating a first control voltage based on the power supply voltage, and the comparison unit is used for generating a second control voltage based on the power supply voltage and the first control voltage; and the switch module controls the on-off between the reference voltage source, a ground voltage and the voltage stabilizing module based on the first control voltage and the second control voltage. According to the voltage source output circuit and the control method, the unstable reference voltage is delayed or interrupted by generating multiple control voltages, so that the problems of power supply voltage power-on overshoot, jitter and the like do not affect the final output voltage waveform, and a good voltage stabilizing effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of integrated circuits, and in particular to a voltage source output circuit and control method. Background Technology

[0002] Common reference voltage sources can often achieve smooth output startup by modifying the architecture to improve stability. However, during rapid power-up, overshoot can still occur due to factors such as the coupling of compensation capacitors. Traditional solutions involve adding capacitors at circuit nodes to slow down the build-up speed of the reference voltage VREF. For example... Figure 1 As shown, in a traditional bandgap circuit, a first capacitor C1 is added to ensure that the PMOS transistor P1 is completely turned off during rapid power-up, preventing the reference voltage VREF from being pulled up. A second capacitor C2 is added to slow down the rise rate of the reference voltage VREF and also to prevent the node of the output reference voltage VREF from being pulled up by VDD through parasitic capacitance. The main disadvantages of this approach are that it requires comprehensive consideration of stability and power-up overshoot during design, necessitates a large capacitor area, and requires different designs for different bandgap structures, making it relatively complex.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a voltage source output circuit and control method that can wait for the reference voltage source output to stabilize before outputting, thereby eliminating the overshoot of the reference voltage under fast power-on conditions.

[0005] To achieve the above objectives, embodiments of the present invention provide a voltage source output circuit, comprising: a reference voltage source for generating a reference voltage based on a power supply voltage; a voltage regulator module for outputting the reference voltage; a switching module connected between the reference voltage source and the voltage regulator module for controlling the on / off state between the reference voltage source and the voltage regulator module; and a control signal module including a delay generation circuit and a comparison unit, wherein the delay generation circuit generates a first control voltage based on a power supply voltage with a delay, the comparison unit generates a second control voltage based on the power supply voltage and the first control voltage, and the switching module controls the on / off state between the reference voltage source and the voltage regulator module based on the second control voltage.

[0006] In one or more embodiments of the present invention, the switching module controls the connection and disconnection between the ground voltage and the voltage regulator module based on a first control voltage.

[0007] In one or more embodiments of the present invention, the delay generation circuit includes a first capacitor, a first resistor, and a conversion circuit. A first terminal of the first capacitor is connected to a power supply voltage. A second terminal of the first capacitor and a first terminal of the first resistor are connected to a first terminal of the conversion circuit to generate a first input voltage based on the power supply voltage. A second terminal of the first resistor is connected to ground voltage. The conversion circuit is used to generate a first control voltage based on the first input voltage.

[0008] In one or more embodiments of the present invention, the delay generation circuit further includes a first switching transistor, the source of the first switching transistor being connected to a first terminal of a first resistor, and the gate and drain of the first switching transistor being connected to a second terminal of a first capacitor.

[0009] In one or more embodiments of the present invention, the conversion circuit includes a first inverter and a second inverter, the input terminal of the first inverter is connected to the second terminal of the first capacitor, the output terminal of the first inverter is connected in series with the input terminal of the second inverter, and the output terminal of the second inverter is used to output a first control signal.

[0010] In one or more embodiments of the present invention, the delay generation circuit includes a counter and a clock circuit, the counter being connected to the clock circuit to generate a first control voltage for delay based on a clock signal.

[0011] In one or more embodiments of the present invention, the comparison unit includes a first comparison circuit, a second comparison circuit, and an OR gate. The first comparison circuit is used to generate a first adjustment voltage based on a power supply voltage, a first reference voltage, and a second reference voltage. The second comparison circuit is used to generate a second adjustment voltage based on a power supply voltage, a first reference voltage, and a second reference voltage. The OR gate is used to perform an OR operation on the first control voltage, the first adjustment voltage, and the second adjustment voltage to generate the second control voltage.

[0012] In one or more embodiments of the present invention, the first comparison circuit includes a first comparator, a second resistor, and a second capacitor. A first terminal of the second resistor is connected to a first reference voltage, a first terminal of the second capacitor is connected to a power supply voltage, and a second terminal of the second resistor and a second terminal of the second capacitor are connected to the positive input terminal of the first comparator and used to generate a second input voltage that follows the change of the power supply voltage. The negative input terminal of the first comparator is used to receive the second reference voltage, and the first comparator is used to compare the magnitudes of the second input voltage and the second reference voltage to generate a first adjustment voltage.

[0013] In one or more embodiments of the present invention, the second comparison circuit includes a second comparator, a third resistor, and a third capacitor. The first terminal of the third resistor is connected to a second reference voltage, the first terminal of the third capacitor is connected to a power supply voltage, the second terminals of the third resistor and the third capacitor are connected to the negative input terminal of the second comparator and are used to generate a third input voltage that follows the change of the power supply voltage, the positive input terminal of the second comparator is used to receive a first reference voltage, and the second comparator is used to compare the magnitude of the third input voltage and the first reference voltage to generate a second adjustment voltage.

[0014] In one or more embodiments of the present invention, the switching module includes a second switching transistor, the source of the second switching transistor is connected to the output terminal of a reference voltage source, the gate of the second switching transistor is used to receive a second control voltage, the drain of the second switching transistor is connected to a voltage regulator module, and the second switching transistor is used to control the switching between the reference voltage source and the voltage regulator module based on the second control voltage.

[0015] In one or more embodiments of the present invention, the switching module includes a third switching transistor, the source of which is connected to ground voltage, the gate of which is used to receive a first control voltage, the drain of which is connected to a voltage regulator module, and the third switching transistor is used to control the switching between ground voltage and voltage regulator module based on the first control voltage.

[0016] In one or more embodiments of the present invention, the voltage regulator module includes a fourth capacitor, the first terminal of the fourth capacitor is connected to the switching module, the second terminal of the fourth capacitor is connected to ground voltage, and the fourth capacitor is used to regulate the reference voltage and generate an output reference voltage.

[0017] This invention also discloses a voltage source output control method, comprising:

[0018] A reference voltage is generated based on the power supply voltage using a reference voltage source;

[0019] The reference voltage is stabilized using a voltage regulator module;

[0020] A delay generation circuit generates a first control voltage based on the power supply voltage. A comparison unit generates a second control voltage based on the power supply voltage and the first control voltage. A delay generation circuit generates a first control voltage based on the power supply voltage. A comparison unit generates a second control voltage based on the power supply voltage and the first control voltage. A switching module controls the on / off connection between the reference voltage source and the voltage regulator module based on the second control voltage.

[0021] In one or more embodiments of the present invention, the switching module controls the connection and disconnection between the voltage regulator module and the ground voltage based on the first control voltage.

[0022] Compared with the prior art, the voltage source output circuit and control method according to the present invention, without modifying the existing reference voltage source structure, generates multiple control voltages by introducing a control signal module and a switching module to delay or isolate unstable reference voltages, so that problems such as power-on overshoot and jitter will not affect the final output voltage waveform, thus achieving a good voltage stabilization effect. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the output circuit of a traditional reference voltage source;

[0024] Figure 2 This is a structural diagram of a voltage source output circuit according to an embodiment of the present invention;

[0025] Figure 3 This is a structural diagram of a control signal module according to an embodiment of the present invention;

[0026] Figure 4 This is a timing diagram of the first control voltage according to an embodiment of the present invention;

[0027] Figure 5 This is a flowchart of a voltage source output control method according to an embodiment of the present invention;

[0028] Figure 6 This is a voltage output timing diagram according to an embodiment of the present invention;

[0029] Figure 7 This is a circuit structure and voltage output timing diagram according to another embodiment of the present invention. Detailed Implementation

[0030] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0031] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0032] The terms "coupled," "connected," or "linked" in this specification include both direct and indirect connections. An indirect connection is a connection made through an intermediate medium, such as an electrical conduction medium, which may have parasitic inductance or capacitance. Indirect connections may also include connections made through other active or passive devices to achieve the same or similar functional purpose, such as connections through switches, follower circuits, or other circuits or components. Furthermore, in this invention, terms such as "first" and "second" are primarily used to distinguish one technical feature from another, and do not necessarily require or imply any actual relationship, quantity, or order between these technical features.

[0033] Example 1

[0034] like Figure 2 As shown, the voltage source output circuit includes a reference voltage source 10, a control signal module 20, a switching module 30, and a voltage regulator module 40.

[0035] The reference voltage source 10 generates a reference voltage Vref based on the power supply voltage VDD, and the voltage regulator module 40 stabilizes the reference voltage Vref. The switching module 30 controls the connection and disconnection between the reference voltage source 10, the ground voltage, and the voltage regulator module 40. The switching module 30 controls the connection and disconnection between the reference voltage source VDD, the ground voltage, and the voltage regulator module 40 based on a first control voltage Vc1 and a second control voltage Vc2. Specifically, the switching module 30 controls the connection and disconnection between the ground voltage and the voltage regulator module 40 based on the first control voltage Vc1, and the switching module 30 controls the connection and disconnection between the reference voltage source 10 and the voltage regulator module 40 based on the second control voltage Vc2.

[0036] like Figure 3 As shown, the control signal module 20 includes a delay generation circuit 21 and a comparison unit 22. The delay generation circuit 21 is used to generate a first control voltage Vc1 based on the power supply voltage VDD, and the comparison unit 22 is used to generate a second control voltage Vc2 based on the power supply voltage VDD and the first control voltage Vc1.

[0037] The delay generation circuit 21 includes a first capacitor C1, a first resistor R1, a first switch M1, and a conversion circuit 211. The first terminal of the first capacitor C1 is connected to the power supply voltage VDD, and the second terminal of the first capacitor C1 is connected to the first terminal of the conversion circuit 211 to generate a first input voltage V1 based on the power supply voltage VDD. The first switch M1 is an N-channel MOSFET. The source of the first switch M1 is connected to ground through the first resistor R1, and the gate and drain of the first switch M1 are connected to the second terminal of the first capacitor C1 to generate the first input voltage V1. The conversion circuit 211 generates a first control voltage Vc1 based on the first input voltage V1. In other embodiments, the first switch M1 can be a P-channel MOSFET, in which case the connection structure between the MOSFET and other components can be adapted accordingly.

[0038] The conversion circuit 211 includes a first inverter B1 and a second inverter B2. The input terminal of the first inverter B1 is connected to the second terminal of the first capacitor C1, and the output terminal of the first inverter B1 is connected to the input terminal of the second inverter B2. The output terminal of the second inverter B2 is connected to the first input terminal of the OR gate of the comparison unit 22 to output the first control voltage Vc1.

[0039] like Figure 4 As shown, in one embodiment, when the power supply voltage VDD is rapidly powered on, the first input voltage V1 is pulled high by the power supply voltage VDD through the first capacitor C1, and then slowly discharged through the first resistor R1 (in the megaohm range) until the first input voltage V1 is less than the toggling threshold of the first inverter B1. At this point, the first inverter B1 outputs a high-level signal, and the second inverter B2 toggles this high-level signal, thereby generating a low-level first control voltage Vc1 through the discharge delay of the first capacitor C1. The voltage Vgs between the gate and source of the first switching transistor M1 reduces the voltage across the first resistor R1, thereby slowing down the discharge rate and relaxing the resistance requirement of the first resistor R1.

[0040] like Figure 3 As shown, the comparison unit 22 includes a first comparison circuit 221, a second comparison circuit 222, and an OR gate. The first comparison circuit 221 is used to generate a first adjustment voltage Vt1 based on the power supply voltage VDD, the first reference voltage Vrefl, and the second reference voltage Vrefh. The second comparison circuit 222 is used to generate a second adjustment voltage Vt2 based on the power supply voltage VDD, the first reference voltage Vrefl, and the second reference voltage Vrefh. The OR gate is used to perform an OR operation on the first control voltage Vc1, the first adjustment voltage Vt1, and the second adjustment voltage Vt2 to generate the second control voltage Vc2.

[0041] The first comparator circuit 221 includes a second capacitor C2, a second resistor R2, and a first comparator COMP1. The first terminal of the second capacitor C2 is connected to the power supply voltage VDD, and the first terminal of the second resistor R2 is connected to the first reference voltage Vrefl. The second terminals of the second capacitor C2 and the second resistor R2 are connected to the positive input terminal of the first comparator COMP1 and are used to generate a second input voltage V2 that follows the change of the power supply voltage VDD. The negative input terminal of the first comparator COMP1 is used to receive the second reference voltage Vrefh. The first comparator COMP1 is used to compare the magnitudes of the second input voltage V2 and the second reference voltage Vrefh to generate a first adjustment voltage Vt1. The output terminal of the first comparator COMP1 is connected to the second input terminal of an OR gate.

[0042] The second comparator circuit 222 includes a third capacitor C3, a third resistor R3, and a second comparator COMP2. The first terminal of the third capacitor C3 is connected to the power supply voltage VDD, and the first terminal of the third resistor R3 is connected to the second reference voltage Vrefh. The second terminals of the third capacitor C3 and the third resistor R3 are connected to the negative input terminal of the second comparator COMP2 and are used to generate a third input voltage V3 that follows the change of the power supply voltage VDD. The positive input terminal of the second comparator COMP2 is used to receive the first reference voltage Vrefl. The second comparator COMP2 is used to compare the magnitude of the first reference voltage Vrefl and the third input voltage V3 to generate a second adjustment voltage Vt2. The output terminal of the second comparator COMP2 is connected to the third input terminal of an OR gate.

[0043] The first input of the OR gate is connected to the output of the second inverter B2 to receive the first control voltage Vc1. The second input of the OR gate is connected to the output of the first comparator COMP1 to receive the first adjustment voltage Vt1. The third input of the OR gate is connected to the output of the second comparator COMP2 to receive the second adjustment voltage Vt2. The output of the OR gate is connected to the gate of the second switch M2 to output the second control voltage Vc2.

[0044] In one embodiment, the second resistor R2 is used to prevent changes in the power supply voltage VDD from directly affecting the first reference voltage Vrefl, and the third resistor R3 is used to prevent changes in the power supply voltage VDD from directly affecting the second reference voltage Vrefh.

[0045] In one embodiment, the first reference voltage Vrefl is slightly lower than the second reference voltage Vrefh. During normal operation, the second input voltage V2 is equal to the first reference voltage Vrefl, and the third input voltage V3 is equal to the second reference voltage Vrefh. When the power supply voltage VDD steps upward, the second input voltage V2 is pulled high through the second capacitor C2, and since the second input voltage V2 is greater than the second reference voltage Vrefh, the first adjustment voltage Vt1 flips to a high level. When the power supply voltage VDD steps downward, the third input voltage V3 is pulled low through the third capacitor C3, and since the third input voltage V3 is less than the first reference voltage Vrefl, the second adjustment voltage Vt2 flips to a high level.

[0046] When any one of the first control voltage Vc1, the first adjustment voltage Vt1, and the second adjustment voltage Vt2 is at a high level, the second control voltage Vc2 is at a high level.

[0047] like Figure 2 As shown, the switching module 30 includes a second switching transistor M2 and a third switching transistor M3. The second switching transistor M2 is a P-channel MOSFET, and the third switching transistor M3 is an N-channel MOSFET.

[0048] The source of the second switch M2 is connected to the output terminal of the reference voltage source 10, the drain of the second switch M2 is connected to the first terminal of the voltage regulator module, and the gate of the second switch M2 is connected to the output terminal of the OR gate of the comparator unit 22 to receive the second control voltage Vc2. The second switch M2 is used to control the on / off state between the reference voltage source 10 and the voltage regulator module 40 based on the second control voltage Vc2.

[0049] Specifically, when the second control voltage Vc2 is low, the second switch M2 is turned on, and the reference voltage source 10 and the voltage regulator module 40 are connected. When the second control voltage Vc2 is high, the second switch M2 is turned off, and the reference voltage source 10 and the voltage regulator module 40 are disconnected.

[0050] The source of the third switch M3 is connected to the ground voltage, the drain of the third switch M3 is connected to the first terminal of the voltage regulator module 40, and the gate of the third switch M3 is connected to the output terminal of the second inverter B2 of the conversion circuit 211 to receive the first control voltage Vc1. The third switch M3 is used to control the switching between the ground voltage and the voltage regulator module 40 based on the first control voltage Vc1.

[0051] Specifically, when the first control voltage Vc1 is high, the third switch M3 is turned on, and the voltage regulator module 40 is connected to the ground voltage; when the first control voltage Vc1 is low, the third switch M3 is turned off, and the voltage regulator module 40 is disconnected from the ground voltage.

[0052] like Figure 2As shown, the voltage regulator module 40 includes a fourth capacitor C4. The first terminal of the fourth capacitor C4 is connected to the drain of the second switching transistor M2 and the drain of the third switching transistor M3. The second terminal of the fourth capacitor C4 is connected to the ground voltage. The fourth capacitor C4 is used to regulate the reference voltage Vref and output the reference voltage Vref_out.

[0053] During normal operation, the fourth capacitor C4 is charged by the reference voltage Vref. When the power supply voltage VDD experiences an upward or downward step, the second control voltage Vc2 flips to a high level, the path between the reference voltage source 10 and the voltage regulator module 40 is broken, and the fourth capacitor C4 discharges to maintain a stable output reference voltage Vref_out.

[0054] like Figure 5 As shown, based on the voltage source output circuit described above, this embodiment also discloses a voltage source output control method, including:

[0055] The reference voltage Vref is generated by the reference voltage source 10 based on the power supply voltage VDD.

[0056] The delay generation circuit 21 generates a first control voltage Vc1 based on the power supply voltage VDD, and the comparison unit 22 generates a second control voltage Vc2 based on the power supply voltage VDD and the first control voltage Vc1.

[0057] The switching module 30 controls the output reference voltage Vref based on the first control voltage Vc1 and the second control voltage Vc2.

[0058] The reference voltage Vref is stabilized by the voltage regulator module 40. In one embodiment, the switching module 30 controls the connection and disconnection between the voltage regulator module 40 and the ground voltage based on a first control voltage Vc1, and controls the connection and disconnection between the reference voltage source 10 and the voltage regulator module 40 based on a second control voltage Vc2.

[0059] When the first control voltage Vc1 is high, the voltage regulator module 40 is connected to ground; when the first control voltage Vc1 is low, the voltage regulator module 40 is disconnected from ground. When the second control voltage Vc2 is low, the reference voltage source 10 is connected to the voltage regulator module 40; when the second control voltage Vc2 is high, the reference voltage source 10 is disconnected from the voltage regulator module 40.

[0060] Specifically, such as Figure 6As shown, when the power supply voltage VDD is rapidly powered on, the first control voltage Vc1 and the second control voltage Vc2 rise with the power supply voltage VDD. The third switch M3 turns on, and the second switch M2 turns off. The output reference voltage Vref_out is kept low through the third switch M3. After a delay, the first control voltage Vc1 and the second control voltage Vc2 turn low, the third switch M3 turns off, the second switch M2 turns on, and the output reference voltage Vref_out turns high. At this time, the power-on overshoot of the reference voltage has been eliminated and does not affect the waveform of the output reference voltage Vref_out.

[0061] When the voltage power supply VDD experiences an upward or downward step, the second control voltage Vc2 will briefly rise to a high level, the second switch M2 will turn off, isolating the reference voltage Vref and the output reference voltage Vref_out, and the fourth capacitor C4 will continue to maintain a stable output reference voltage Vref_out.

[0062] Example 2

[0063] like Figure 7 As shown, the difference from Embodiment 1 is that the delay generation circuit 21 includes a counter 50 and a clock circuit 60. The clock circuit 60 provides a clock signal CK to the counter 50, and the counter 50 generates a first control voltage Vc1 with a controllable delay time based on the clock signal CK. By implementing the delay using the counter 50, the circuit does not require large-area resistors and capacitors, the purely digital structure design is more flexible, the generated delay is more accurate, and the controllable delay can be generated by configuring the counting time to adapt to different power-on times.

[0064] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A voltage source output circuit, characterized in that, include: A reference voltage source is used to generate a reference voltage based on the power supply voltage. A voltage regulator module is used to output a reference voltage. The switching module is connected between the reference voltage source and the voltage regulator module and is used to control the on / off state between the reference voltage source and the voltage regulator module. The control signal module includes a delay generation circuit and a comparison unit. The delay generation circuit generates a first control voltage based on a power supply voltage with a delay. The comparison unit includes a first comparison circuit, a second comparison circuit, and an OR gate. The first comparison circuit generates a first adjustment voltage based on the power supply voltage, a first reference voltage, and a second reference voltage. The second comparison circuit generates a second adjustment voltage based on the power supply voltage, the first reference voltage, and the second reference voltage. The OR gate performs an OR operation on the first control voltage, the first adjustment voltage, and the second adjustment voltage to generate the second control voltage. The switching module controls the switching between the reference voltage source and the voltage regulator module based on the second control voltage.

2. The voltage source output circuit as described in claim 1, characterized in that, The switching module controls the connection and disconnection between the ground voltage and the voltage regulator module based on the first control voltage.

3. The voltage source output circuit as described in claim 1, characterized in that, The delay generation circuit includes a first capacitor, a first resistor, and a conversion circuit. The first terminal of the first capacitor is connected to the power supply voltage. The second terminal of the first capacitor and the first terminal of the first resistor are connected to the first terminal of the conversion circuit to generate a first input voltage based on the power supply voltage. The second terminal of the first resistor is connected to ground voltage. The conversion circuit is used to generate a first control voltage based on the first input voltage.

4. The voltage source output circuit as described in claim 3, characterized in that, The delay generation circuit further includes a first switching transistor, the source of which is connected to the first end of a first resistor, and the gate and drain of the first switching transistor are connected to the second end of a first capacitor.

5. The voltage source output circuit as described in claim 4, characterized in that, The conversion circuit includes a first inverter and a second inverter. The input terminal of the first inverter is connected to the second terminal of the first capacitor, and the output terminal of the first inverter is connected to the input terminal of the second inverter. The output terminal of the second inverter is used to output a first control signal.

6. The voltage source output circuit as described in claim 1, characterized in that, The delay generation circuit includes a counter and a clock circuit, wherein the counter is connected to the clock circuit to generate a first control voltage for delay based on a clock signal.

7. The voltage source output circuit as described in claim 1, characterized in that, The first comparison circuit includes a first comparator, a second resistor, and a second capacitor. The first end of the second resistor is connected to a first reference voltage, and the first end of the second capacitor is connected to a power supply voltage. The second ends of the second resistor and the second end of the second capacitor are connected to the positive input terminal of the first comparator and are used to generate a second input voltage that follows the change of the power supply voltage. The negative input terminal of the first comparator is used to receive the second reference voltage. The first comparator is used to compare the magnitudes of the second input voltage and the second reference voltage to generate a first adjustment voltage.

8. The voltage source output circuit as described in claim 1, characterized in that, The second comparator circuit includes a second comparator, a third resistor, and a third capacitor. The first end of the third resistor is connected to a second reference voltage, and the first end of the third capacitor is connected to a power supply voltage. The second ends of the third resistor and the third capacitor are connected to the negative input of the second comparator and are used to generate a third input voltage that follows the change of the power supply voltage. The positive input of the second comparator is used to receive a first reference voltage. The second comparator is used to compare the magnitude of the third input voltage and the first reference voltage to generate a second adjustment voltage.

9. The voltage source output circuit as described in claim 1, characterized in that, The switching module includes a second switching transistor, the source of which is connected to the output terminal of a reference voltage source, the gate of which is used to receive a second control voltage, and the drain of which is connected to a voltage regulator module. The second switching transistor is used to control the switching between the reference voltage source and the voltage regulator module based on the second control voltage.

10. The voltage source output circuit as described in claim 2, characterized in that, The switching module includes a third switching transistor, the source of which is connected to ground voltage, the gate of which is used to receive a first control voltage, and the drain of which is connected to a voltage regulator module. The third switching transistor is used to control the switching between ground voltage and voltage regulator module based on the first control voltage.

11. The voltage source output circuit as described in claim 1, characterized in that, The voltage regulator module includes a fourth capacitor. The first terminal of the fourth capacitor is connected to the switching module, and the second terminal of the fourth capacitor is connected to ground voltage. The fourth capacitor is used to regulate the reference voltage and generate an output reference voltage.

12. A voltage source output control method, characterized in that, Based on the voltage source output circuit as described in any one of claims 1 to 11, the control method includes: A reference voltage is generated based on the power supply voltage using a reference voltage source; The reference voltage is stabilized using a voltage regulator module; A delay generation circuit generates a first control voltage based on the power supply voltage. A first comparison circuit generates a first adjustment voltage based on the power supply voltage, a first reference voltage, and a second reference voltage. A second comparison circuit generates a second adjustment voltage based on the power supply voltage, the first reference voltage, and the second reference voltage. An OR gate performs an OR operation on the first control voltage, the first adjustment voltage, and the second adjustment voltage to generate the second control voltage. A switching module controls the on / off connection between the reference voltage source and the voltage regulator module based on the second control voltage.

13. The voltage source output control method as described in claim 12, characterized in that, The switching module controls the connection and disconnection between the voltage regulator module and the ground voltage based on the first control voltage.

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