Bandgap reference control circuit and electronic device

Abstract

The present application provides a bandgap reference control circuit and electronic device, belonging to the field of power supply technology. The base tone module converts the pre-adjusted low voltage into an initial start-up current. The voltage stabilization start module is connected to the base tone module, and is used to adjust the on and off of the circuit according to the initial start-up current. The first end of the low voltage stabilization module is connected to the high voltage power supply. The second end of the low voltage stabilization module is connected to the pre-adjustment module. The third end of the low voltage stabilization module is connected to the voltage stabilization start module. The low voltage stabilization module is used to turn on when the voltage stabilization start module is turned on, and output a gradually changing low voltage according to the high voltage and the pre-adjusted low voltage. The input end of the bandgap reference module is connected to the output end of the low voltage stabilization module, and is used to output a reference voltage according to the gradually changing low voltage. The fourth end of the low voltage stabilization module is connected to the output end of the bandgap reference module, and is used to regulate the gradually changing low voltage according to the reference voltage, and turn off the voltage stabilization start module when the reference voltage and the gradually changing low voltage are stable.

Description

Technical Field

[0001] The present application belongs to the technical field of power supply, and in particular relates to a bandgap reference control circuit and electronic equipment. Background Art

[0002] The bandgap reference circuit is a key circuit structure in the power supply system. It can provide a stable reference voltage for other circuits in the power supply system, thereby ensuring the stable performance of other circuits based on the reference voltage. It is suitable for circuits such as DC-DC controllers in the power supply system. The accuracy of the bandgap reference circuit is crucial to the accuracy of the entire system.

[0003] The bandgap reference circuit operates in the low voltage field. In the high voltage circuit, the high voltage power supply generates a pre-regulated voltage in the low voltage field after passing through the pre-regulation circuit. The pre-regulated voltage serves as the power supply for the bandgap reference circuit. The bandgap reference circuit generates a reference voltage to provide a reference voltage for other subsequent circuits in the power supply system. However, affected by factors such as area and power consumption, the fluctuation range of the pre-regulated voltage generated by the pre-regulation circuit is relatively large, resulting in low stability, and it is impossible to provide a stable power supply for the bandgap reference circuit, resulting in poor accuracy of the reference voltage generated by the bandgap reference circuit, and it is impossible to provide a stable reference voltage for other subsequent circuits in the power supply system. Summary of the invention

[0004] The purpose of the present application is to provide a bandgap reference control circuit and electronic equipment, aiming to solve the problem of poor accuracy of the reference voltage of the bandgap reference circuit caused by pre-adjustment voltage fluctuations in traditional high-voltage circuits.

[0005] The present application provides a bandgap reference control circuit, comprising:

[0006] A pre-regulation module, used for converting a high voltage generated by a high voltage power supply into a pre-regulated low voltage;

[0007] A base tone module, connected to the pre-regulation module, for converting the pre-regulated low voltage into an initial start-up current;

[0008] A voltage stabilizing start module, connected to the base tone module, for regulating the on / off of the circuit according to the initial start current;

[0009] A low voltage stabilization module, wherein a first end of the low voltage stabilization module is connected to the high voltage power supply, a second end of the low voltage stabilization module is connected to the pre-regulation module, and a third end of the low voltage stabilization module is connected to the voltage stabilization start module, and the low voltage stabilization module is used to turn on when the voltage stabilization start module is turned on, and output a gradually changing low voltage according to the high voltage and the pre-regulated low voltage;

[0010] A bandgap reference module, the input end of which is connected to the output end of the low voltage stabilization module, and is used to output a reference voltage according to the gradually changing low voltage;

[0011] The fourth end of the low voltage stabilization module is connected to the output end of the bandgap reference module, and is used to regulate the gradually changing low voltage according to the reference voltage, and turn off the voltage stabilization start module when the reference voltage and the gradually changing low voltage are stable.

[0012] In one embodiment, the voltage stabilization start module includes:

[0013] a first switch module, connected to the third end of the low voltage stabilization module and the fourth end of the low voltage stabilization module respectively, for turning on the low voltage stabilization module according to the initial start-up current, and turning off when the reference voltage and the gradually changing low voltage are stable;

[0014] The second switch module is connected to the fourth end of the low voltage stabilization module, and is used for being turned on according to the initial start-up current when the reference voltage and the gradually changing low voltage are stable.

[0015] In one embodiment, the low voltage stabilization module comprises:

[0016] A current starting module, wherein a first end of the current starting module is connected to the first switch module, a second end of the current starting module is connected to the high voltage power supply, and a third end of the current starting module is connected to the pre-regulation module;

[0017] The current starting module is used to be turned on when the first switch module is turned on, and to generate a branch starting current according to the high voltage and the pre-adjusted low voltage.

[0018] In one embodiment, the low voltage stabilization module comprises:

[0019] The current mirror module is connected to the fourth terminal of the current starting module and the high voltage power supply respectively, and is used to proportionally reproduce the branch starting current to form an output side current.

[0020] In one embodiment, the low voltage stabilization module comprises:

[0021] A low voltage control module, a first end of which is connected to the current mirror module and is used to output a gradually changing low voltage according to the output side current;

[0022] The input end of the bandgap reference module is connected to the first end of the low voltage control module, and is used to output a reference voltage according to the gradually changing low voltage;

[0023] The second end of the low voltage control module is connected to the first switch module and the second switch module respectively, the first switch module is used to turn on or off according to the voltage of the second end of the low voltage control module and the initial start current, and the second switch module is used to turn on or off according to the voltage of the second end of the low voltage control module and the initial start current;

[0024] A third terminal of the low voltage control module is grounded.

[0025] In one embodiment, the low voltage control module includes:

[0026] A first voltage divider module, wherein a first end of the first voltage divider module is respectively connected to input ends of the current mirror module and the bandgap reference module;

[0027] a second voltage dividing module, wherein a first end of the second voltage dividing module is connected to a second end of the first voltage dividing module;

[0028] A third voltage dividing module, wherein a first end of the third voltage dividing module is connected to a second end of the second voltage dividing module, and a second end of the third voltage dividing module is grounded.

[0029] In one embodiment, the first switch module comprises:

[0030] A first field effect transistor, wherein the gate of the first field effect transistor is connected to the first end of the second voltage divider module, the source of the first field effect transistor is connected to the base tone module, and the drain of the first field effect transistor is connected to the first end of the current start module.

[0031] In one embodiment, the second switch module comprises:

[0032] A second field effect transistor, wherein a gate of the second field effect transistor is connected to the first end of the second voltage divider module, a drain of the second field effect transistor is connected to the base tone module, and a source of the second field effect transistor is grounded.

[0033] In one embodiment, the low voltage stabilization module comprises:

[0034] A loop feedback module, wherein a first input end of the loop feedback module is connected to an output end of the bandgap reference module, a second input end of the loop feedback module is connected to a first end of the third voltage divider module, and an output end of the loop feedback module is respectively connected to a drain of the first field effect transistor and a first end of the current start module;

[0035] The loop feedback module is used to output a feedback current to the current starting module according to the reference voltage and the voltage divided by the third voltage divider module;

[0036] The current startup module is used to start when the first field effect transistor is turned on, and adjust the branch startup current according to the high voltage, the pre-adjusted low voltage and the feedback current.

[0037] The present application provides an electronic device, comprising a bandgap reference control circuit according to any one of the above embodiments.

[0038] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0039] In the control circuit of the bandgap reference provided by the present application, the pre-regulation module converts the high voltage VIN generated by the high voltage power supply into a pre-regulated low voltage pre_vdd. The base tone module works under the pre-regulated low voltage pre_vdd, so that the voltage stabilization start module starts to conduct to turn on the low voltage stabilization module. The gradually changing low voltage Vout1 output by the low voltage stabilization module serves as the power supply of the bandgap reference module, and the reference voltage Vout2 output by the bandgap reference module serves as the feedback voltage of the low voltage stabilization module. The gradually changing low voltage Vout1 output by the low voltage stabilization module gradually increases, so that the reference voltage Vout2 output by the bandgap reference module also increases accordingly. Subsequently, the reference voltage Vout2 is used as the feedback voltage of the low voltage stabilization module, and after being fed back to the low voltage stabilization module, the gradually changing low voltage Vout1 output by the low voltage stabilization module is adjusted, so that it is continuously circulated to form a loop structure, so that the gradually changing low voltage Vout1 and the reference voltage Vout2 are started together and affect each other, until the gradually changing low voltage Vout1 and the reference voltage Vout2 both reach a stable state. After both the gradually changing low voltage Vout1 and the reference voltage Vout2 reach a stable state, the accuracy of the reference voltage Vout2 output by the bandgap reference module can be greatly improved, solving the problem of poor accuracy of the reference voltage of the bandgap reference circuit caused by pre-adjustment voltage fluctuations in traditional circuits.

[0040] Furthermore, the voltage stabilization start module is connected to the base tone module and the low voltage stabilization module respectively. C By adjusting the on / off of the circuit, the low-voltage stabilization module can be turned on and turned off when the reference voltage Vout2 and the gradually changing low voltage Vout1 are stable, so that the low-voltage stabilization module and the bandgap reference module gradually get rid of the degenerate state when they are started. It can also be understood as making the circuit get rid of the merger point, realizing the generation of high-precision reference voltage under high-voltage power supply conditions, and providing high-precision reference voltage for other subsequent circuits in the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of the structure of the bandgap reference control circuit provided in this application;

[0042] Figure 2A schematic diagram of a specific circuit structure of a bandgap reference control circuit provided in this application;

[0043] Figure 3 A schematic diagram of the circuit structure of the voltage stabilization start module provided in this application;

[0044] Figure 4 This is a schematic diagram of the circuit structure of the low voltage stabilization module provided in this application. DETAILED DESCRIPTION

[0045] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0046] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0047] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0049] See also Figure 1 The present application provides a bandgap reference control circuit 100. The bandgap reference control circuit 100 includes a pre-regulation module 10, a base tone module 20, a voltage stabilization start module 30, a low voltage stabilization module 40 and a bandgap reference module 50. The pre-regulation module 10 is used to convert the high voltage VIN generated by the high voltage power supply into a pre-regulated low voltage pre_vdd. The base tone module 20 is connected to the pre-regulation module 10 and is used to convert the pre-regulated low voltage pre_vdd into an initial start current I CThe voltage stabilizing start module 30 is connected to the base tone module 20 and is used to start the voltage according to the initial start current I C Adjust the on and off of the circuit. The first end of the low voltage stabilization module 40 is connected to the high voltage power supply. The second end of the low voltage stabilization module 40 is connected to the pre-regulation module 10. The third end of the low voltage stabilization module 40 is connected to the voltage stabilization start module 30. The low voltage stabilization module 40 is used to turn on when the voltage stabilization start module 30 is turned on, and output a gradually changing low voltage Vout1 according to the high voltage VIN and the pre-regulated low voltage pre_vdd.

[0050] The input end of the bandgap reference module 50 is connected to the output end of the low voltage stabilization module 40, and is used to output the reference voltage Vout2 according to the gradually changing low voltage Vout1. The fourth end of the low voltage stabilization module 40 is connected to the output end of the bandgap reference module 50, and is used to regulate the gradually changing low voltage Vout1 according to the reference voltage Vout2, and turn off the voltage stabilization start module 30 when the reference voltage Vout2 and the gradually changing low voltage Vout1 are stable.

[0051] In this embodiment, the bandgap reference module 50 operates in the low voltage field. The high voltage power supply is used to generate a high voltage VIN. In one embodiment, it can reach 36V or more. After the high voltage VIN is adjusted by the pre-adjustment module 10, the pre-adjusted low voltage pre_vdd with poor accuracy is output. In one embodiment, the pre-adjusted low voltage pre_vdd is lower than 5V. The pre-adjusted low voltage pre_vdd serves as the power supply in the low voltage field required by the base tone module 20 and the low voltage stabilization module 40, and can also be understood as the low voltage required by the components in the base tone module 20 and the low voltage stabilization module 40. The base tone module 20 generates an initial start-up current I according to the pre-adjusted low voltage pre_vdd. C . Initial start-up current I C Flowing into the voltage stabilizing start module 30 to control the conduction or shutdown of the circuit where the voltage stabilizing start module 30 is located can also be understood as giving a voltage to one end of the voltage stabilizing start module 30 to adjust the conduction or shutdown of the circuit where the voltage stabilizing start module 30 is located.

[0052] The first end of the low voltage stabilization module 40 is connected to the high voltage power supply. The high voltage VIN generated by the high voltage power supply provides a high voltage to the low voltage stabilization module 40, which can also be understood as the components in the low voltage stabilization module 40 providing the required high voltage VIN to assist the low voltage stabilization module 40 in working. The pre-regulated low voltage pre_vdd output by the pre-regulation module 10 provides the required low voltage pre_vdd for the components in the low voltage stabilization module 40 to assist the low voltage stabilization module 40 in working. Initial start-up current I C After flowing through the voltage stabilizing start module 30, the voltage stabilizing start module 30 is turned on, and the low voltage stabilizing module 40 is turned on. CAfter passing through the voltage stabilization start module 30 , it enters the low voltage stabilization module 40 and combines with the high voltage VIN and the pre-regulated low voltage pre_vdd to form a gradual low voltage Vout1 . The gradual low voltage Vout1 is the output voltage of the low voltage stabilization module 40 and provides an input voltage for the bandgap reference module 50 .

[0053] The input voltage of the bandgap reference module 50 is the gradually changing low voltage Vout1 output by the low voltage stabilization module 40. It can also be understood that the power supply voltage of the bandgap reference module 50 is the gradually changing low voltage Vout1 output by the low voltage stabilization module 40. The gradually changing low voltage Vout1 changes in the low voltage field. The bandgap reference module 50 outputs a reference voltage Vout2 according to the gradually changing low voltage Vout1. When the voltage stabilization start module 30 is not turned on, the gradually changing low voltage Vout1 and the reference voltage Vout2 of the low voltage stabilization module 40 are both zero. With the initial start current I C After flowing through the voltage stabilizing start module 30 , the voltage stabilizing start module 30 is turned on, and after the low voltage stabilizing module 40 is turned on, the gradually changing low voltage Vout1 gradually increases, thereby causing the reference voltage Vout2 to gradually increase.

[0054] The reference voltage Vout2 is fed back to the fourth end of the low-voltage stabilization module 40. The reference voltage Vout2 output by the bandgap reference module 50 is used as the reference voltage of the low-voltage stabilization module 40. Furthermore, the low-voltage stabilization module 40 regulates the gradually changing low voltage Vout1 output by the low-voltage stabilization module 40 according to the fed-back reference voltage Vout2 until the reference voltage Vout2 and the gradually changing low voltage Vout1 are fully established. The reference voltage Vout2 and the gradually changing low voltage Vout1 are fully established, which can also be understood as the reference voltage Vout2 and the gradually changing low voltage Vout1 have reached the expected stable value and state, which can also be understood as the reference voltage Vout2 remains stable and no longer changes, and the gradually changing low voltage Vout1 also remains stable and no longer changes. In one embodiment, when the reference voltage Vout2 remains stable and no longer changes, the reference voltage Vout2 can be stable within a range of allowed fluctuations, for example, the fluctuation range is within the range of 1% to 3% of the reference voltage Vout2. When the gradually changing low voltage Vout1 remains stable and no longer changes, the gradually changing low voltage Vout1 can be stable within an allowable fluctuation range, for example, the fluctuation range is within a range of 1% to 3% of the gradually changing low voltage Vout1. Thus, the bandgap reference module 50 outputs a stable and high-precision reference voltage Vout2, which serves as the output voltage of the bandgap reference module 50, and provides a stable and high-precision reference voltage for other subsequent circuits in the power supply system.

[0055] With the initial turn-on current I CAfter flowing through the voltage stabilizing start module 30, the voltage stabilizing start module 30 is turned on, and after the low voltage stabilizing module 40 is turned on, the gradually changing low voltage Vout1 gradually increases, and the voltage at the connection end of the low voltage stabilizing module 40 and the voltage stabilizing start module 30 also increases accordingly. When the gradually changing low voltage Vout1 and the reference voltage Vout2 are stable, the voltage stabilizing start module 30 is turned off, and the low voltage stabilizing module 40 and the bandgap reference module 50 will continue to work stably, providing a stable and high-precision reference voltage for other subsequent circuits in the power supply system.

[0056] Thus, the pre-regulation module 10 in the bandgap reference control circuit 100 provided in the present application converts the high voltage VIN generated by the high voltage power supply into a pre-regulated low voltage pre_vdd. The base tone module 20 works under the pre-regulated low voltage pre_vdd, so that the voltage stabilization start module 30 starts to conduct to turn on the low voltage stabilization module 40. The gradually changing low voltage Vout1 output by the low voltage stabilization module 40 serves as the power supply of the bandgap reference module 50, and the reference voltage Vout2 output by the bandgap reference module 50 serves as the feedback voltage of the low voltage stabilization module 40. The gradually changing low voltage Vout1 output by the low voltage stabilization module 40 gradually increases, so that the reference voltage Vout2 output by the bandgap reference module 50 also increases accordingly. Subsequently, the reference voltage Vout2 is used as the feedback voltage of the low voltage stabilization module 40. After being fed back to the low voltage stabilization module 40, the gradually changing low voltage Vout1 output by the low voltage stabilization module 40 is adjusted, and this is circulated continuously to form a loop structure, so that the gradually changing low voltage Vout1 and the reference voltage Vout2 are started together and affect each other until the gradually changing low voltage Vout1 and the reference voltage Vout2 both reach a stable state. After the gradually changing low voltage Vout1 and the reference voltage Vout2 both reach a stable state, the accuracy of the reference voltage Vout2 output by the bandgap reference module 50 can be greatly improved, solving the problem of poor accuracy of the reference voltage of the bandgap reference circuit caused by the pre-adjustment voltage fluctuation in the traditional circuit.

[0057] Furthermore, the voltage stabilization start module 30 is connected to the base tone module 20 and the low voltage stabilization module 40 respectively. The voltage stabilization start module 30 starts according to the initial start current I C By adjusting the on and off of the circuit, the low voltage stabilization module 40 can be turned on and turned off when the reference voltage Vout2 and the gradually changing low voltage Vout1 are stable, so that the low voltage stabilization module 40 and the bandgap reference module 50 gradually get rid of the degenerate state when starting. It can also be understood as making the circuit get rid of the merger point, realizing the generation of high-precision reference voltage under high-voltage power supply conditions, and providing high-precision reference voltage for other subsequent circuits in the power supply system.

[0058] In one embodiment, the bandgap reference module 50 includes one or more combinations of bipolar transistors, resistors, operational amplifiers, and capacitors. The pre-regulation module 10 includes one or more combinations of transformers, diodes, capacitors, resistors, transistors, and voltage regulator chips. The baseband module 20 includes one or more combinations of resistors, capacitors, diodes, and triodes.

[0059] See also Figure 2 and Figure 3 As shown, in one embodiment, the voltage stabilization start module 30 includes a first switch module 310 and a second switch module 320. The first switch module 310 is respectively connected to the third end (also understood as Figure 2 and Figure 3 A end shown in FIG) and a fourth end of the low-voltage stabilization module 40 (also understood as Figure 2 and Figure 3 The B terminal shown in FIG. 1 is connected to the initial start current I C The low voltage stabilization module 40 is turned on and turned off when the reference voltage and the gradually changing low voltage are stable.

[0060] The second switch module 320 and the fourth end (also understood as Figure 2 and Figure 3 The B terminal shown in FIG. 1 is connected to be turned on according to the initial turn-on current when the reference voltage and the gradually changing low voltage are stable.

[0061] In this embodiment, when the high voltage VIN is powered on, the pre-regulation module 10 and the base tone module 20 work normally in sequence. The initial start-up current I output by the base tone module 20 C The voltage of the low voltage stabilizing module 40 and the bandgap reference module 50 are in a degenerate state. The voltage value of the gradually changing low voltage Vout1 is 0. The voltage value of the reference voltage Vout2 is 0. Furthermore, the fourth terminal of the low voltage stabilizing module 40 (also known as Figure 2 and Figure 3 The voltage VB at the B end (shown in FIG. 1 ) is 0. The voltage VC at the point C is greater than the voltage VB, that is, VC-VB>Vthp, the first switch module 310 is turned on, and the second switch module 320 is turned off.

[0062] The first switch module 310 is turned on, and the initial turn-on current I C After passing through the first switch module 310, it flows into the A terminal and enters the low voltage stabilization module 40. The low voltage stabilization module 40 is turned on by the first switch module 310, and the voltage at the A terminal is at the initial start current I CWhen the voltage VA at the A terminal is greater than Vthn, the low voltage stabilization module 40 is gradually turned on, and the gradually changing low voltage Vout1 output by the low voltage stabilization module 40 is also gradually increased. Figure 2 and Figure 3 The voltage VB at the B end (shown in FIG. 1 ) also gradually increases, and when the reference voltage and the gradually changing low voltage are stable, VC-VB<Vthp, the first switch module 310 is turned off, and the second switch module 320 is turned on. The first switch module 310 disconnects the connection between the voltage stabilization start module 30 and the low voltage stabilization module 40. The voltage stabilization start module 30 operates independently through the second switch module 320, and the first switch module 310 no longer acts on the low voltage stabilization module 40, so that the low voltage stabilization module 40 and the bandgap reference module 50 are separated from the degenerate state, and the startup of the entire circuit is completed. Therefore, through the first switch module 310 and the second switch module 320, the low voltage stabilization module 40 and the bandgap reference module 50 can be separated from the degenerate state, so as to realize the generation of a high-precision reference voltage Vout2 under high voltage conditions.

[0063] See also Figure 3 and Figure 4 In one embodiment, the first switch module 310 includes a first field effect transistor 311. The gate of the first field effect transistor 311 is connected to the first end of the second voltage divider module 432 (which can also be understood as Figure 3 and Figure 4 The source of the first field effect transistor 311 is connected to the baseband module 20, and an initial start-up current I C The drain of the first field effect transistor 311 is connected to the first end of the current starting module 410 (which can also be understood as Figure 3 and Figure 4 A terminal) connection.

[0064] In this embodiment, the first field effect transistor 311 may be a P-type MOS transistor MP1. An initial turn-on current I is introduced from the source of the first field effect transistor 311. C The drain of the first field effect transistor 311 is connected to the first end of the current start module 410 (which can also be understood as Figure 3 and Figure 4 In one embodiment, the drain of the first field effect transistor 311 is connected to the gate of the third field effect transistor 411 in the current start module 410, and the connection end between the drain of the first field effect transistor 311 and the gate of the third field effect transistor 411 is the A end. In one embodiment, the third field effect transistor 411 is an N-type MOS tube MN2.

[0065] The gate of the first field effect transistor 311 is connected to the first end of the second voltage divider module 432. The first voltage divider module 431, the second voltage divider module 432 and the third voltage divider module 433 in the low voltage control module 430 are connected in series to the ground to form different voltage divisions. The gate of the first field effect transistor 311 is connected to the common end (also known as Figure 3 and Figure 4 The gate voltage of the first field effect transistor 311 is VB, which can also be understood as the voltage sum of the second voltage dividing module 432 and the third voltage dividing module 433.

[0066] The first field effect transistor 311 is connected to the base tone module 20, the gate of the third field effect transistor 411 and the first end of the second voltage divider module 432 respectively, so that the first field effect transistor 311 can turn on the current start module 410 when the low voltage stabilization module 40 is in the initial state. And when the low voltage stabilization module 40 is in the stable state, the first field effect transistor 311 is turned off. Through the first field effect transistor 311, when the low voltage stabilization module 40 and the bandgap reference module 50 are started, the circuit can get rid of the degenerate state, and a high-precision reference voltage Vout2 can be generated under high voltage conditions. Through the first field effect transistor 311, the low voltage stabilization module 40 and the bandgap reference module 50 can also be separated from the low voltage stabilization module 40 and the bandgap reference module 50 when stable, so that the low voltage stabilization module 40 and the bandgap reference module 50 can work stably without causing other effects on the low voltage stabilization module 40 and the bandgap reference module 50.

[0067] In one embodiment, the second switch module 320 includes a second field effect transistor 321. The gate of the second field effect transistor 321 is connected to the first end (also known as Figure 3 and Figure 4 The drain of the second field effect transistor 321 is connected to the base tone module 20, and the source of the second field effect transistor 321 is grounded.

[0068] In this embodiment, the second field effect transistor 321 may be an N-type MOS transistor MN1. An initial turn-on current I is introduced from the drain of the second field effect transistor 321. C The voltage VC at point C is greater than the voltage VB, that is, VC-VB>Vthp, the first field effect transistor 311 is turned on, and the second field effect transistor 321 is turned off. As the low voltage stabilization module 40 is turned on, the voltage VB gradually increases, VC-VB<Vthp, and the first field effect transistor 311 is completely turned off. At this time, VB>Vthn, and the second field effect transistor 321 is turned on. The initial turn-on current I C All of them flow through the second field effect transistor 321 to the ground. Initial start-up current I CThe low voltage stabilization module 40 is no longer acted on, so that the low voltage stabilization module 40 and the bandgap reference module 50 are out of the degenerate state, and the startup of the entire circuit is completed.

[0069] In one embodiment, the second switch module 320 further includes a third resistor 322 (also denoted as R3). A first end of the third resistor 322 is connected to the source of the second field effect transistor 321, and a second end of the third resistor 322 is grounded. VB>Vthn, the second field effect transistor 321 is turned on. The initial turn-on current I C All of them flow through the second field effect transistor 321 and to the ground. C The low voltage stabilization module 40 is no longer acted on, so that the low voltage stabilization module 40 and the bandgap reference module 50 are out of the degenerate state, and the entire circuit is started. The third resistor 322 can assist the opening and closing of the second field effect transistor 321, so that the second switch module 320 works better.

[0070] In one embodiment, the low voltage stabilization module 40 includes a current starting module 410. The first end (also known as Figure 4 The first switch module 310 is connected to the A terminal of the current startup module 410. The second terminal of the current startup module 410 is connected to the high voltage power supply. The third terminal of the current startup module 410 is connected to the pre-regulation module 10. The current startup module 410 is used to turn on when the first switch module 310 is turned on, and generate a branch startup current according to the high voltage VIN and the pre-regulated low voltage pre_vdd.

[0071] In this embodiment, the first terminal (also understood as Figure 4 The A end of the first switch module 310 is connected to the first switch module 310, and when the first switch module 310 is turned on, the initial start current I C Introduced into the current startup module 410, the current startup module 410 is turned on, and then the low voltage stabilization module 40 is turned on. The high voltage VIN generated by the high voltage power supply provides the required high voltage VIN for the components in the current startup module 410 to assist the current startup module 410 in working. The pre-regulated low voltage pre_vdd output by the pre-regulation module 10 provides the required low voltage pre_vdd for the components in the current startup module 410 to assist the current startup module 410 in working. Furthermore, the current startup module 410 is turned on when the first switch module 310 is turned on, and combines the high voltage VIN with the pre-regulated low voltage pre_vdd to collaboratively generate a branch startup current to start the low voltage stabilization module 40 to work.

[0072] In one embodiment, the current start module 410 includes a third field effect transistor 411, a fourth field effect transistor 412, and a fifth field effect transistor 413. The third field effect transistor 411 may be an N-type MOS transistor MN2. The fourth field effect transistor 412 may be an N-type MOS transistor MN3. The fifth field effect transistor 413 may be a P-type MOS transistor MP2.

[0073] The gate of the third field effect transistor 411 is connected to the drain of the first field effect transistor 311, and the connection end is the A end. The source of the third field effect transistor 411 is grounded. The drain of the third field effect transistor 411 is connected to the source of the fourth field effect transistor 412. The gate of the fourth field effect transistor 412 is connected to the pre-adjusted low voltage pre_vdd. The drain of the fourth field effect transistor 412 is connected to the drain of the fifth field effect transistor 413. The source of the fifth field effect transistor 413 is connected to the high voltage VIN. The gate of the fifth field effect transistor 413 is connected to the drain of the fourth field effect transistor 412. The gate of the fifth field effect transistor 413 is also connected to the gate of the sixth field effect transistor 421 in the current mirror module 420.

[0074] When the first field effect transistor 311 is turned on, the initial start current I C The gate voltage of the third field effect transistor 411 is gradually increased under the action of the starting current, so that the gate terminal voltage VA of the third field effect transistor 411 is greater than Vthn, the third field effect transistor 411 is gradually turned on, and the fourth field effect transistor 412 and the fifth field effect transistor 413 are also gradually turned on, forming a branch starting current. The initial start-up current I flowing through the first field effect transistor 311 is reduced by the third field effect transistor 411. C The current is introduced into the current startup module 410, so that the low voltage stabilization module 40 starts to work. The branch startup current in the current startup module 410 can be proportionally reproduced to the current mirror module 420 through the fifth field effect transistor 413, so that the low voltage stabilization module 40 outputs a gradually changing low voltage Vout1, thereby driving the reference voltage Vout2 to change until it is stable.

[0075] In one embodiment, the low voltage stabilization module 40 includes a current mirror module 420. The current mirror module 420 is connected to the fourth terminal of the current startup module 410 and the high voltage power supply respectively, and is used to proportionally reproduce the branch startup current to form an output side current.

[0076] In this embodiment, the fourth end of the current start-up module 410 is connected to the current mirror module 420, and the branch start-up current generated by the current start-up module 410 can be proportionally reproduced to the circuit where the current mirror module 420 is located to form an output side current. The current mirror module 420 forms an output side current according to the current of the current start-up module 410 in proportion, so that the gradually changing low voltage Vout1 output by the low voltage stabilization module 40 is gradually raised. In the process of gradually increasing the gradually changing low voltage Vout1, the reference voltage Vout2 output by the bandgap reference module 50 also gradually increases. The current mirror module 420 can provide a high-precision replica current for the output side of the low voltage stabilization module 40, and can generate an output current that is highly consistent with the branch start-up current, which will not be significantly affected by load changes and power supply fluctuations, so that the reference voltage Vout2 output by the bandgap reference module 50 when stable is more accurate. Further, the current mirror module 420 also reduces the need for complex current source circuits, so that the circuit structure of the bandgap reference control circuit 100 is simpler, occupies less space, and is more conducive to integration.

[0077] In one embodiment, the current mirror module 420 includes a sixth field effect transistor 421. The sixth field effect transistor 421 can be a P-type MOS tube Mpower. The gate of the sixth field effect transistor 421 is connected to the gate of the fifth field effect transistor 413. The source of the sixth field effect transistor 421 is connected to the high voltage VIN. The drain of the sixth field effect transistor 421 is connected to the first end of the first voltage divider module 431 in the low voltage control module 430. The common end formed by the drain of the sixth field effect transistor 421 and the first end of the first voltage divider module 431 serves as the output end of the low voltage stabilization module 40 to output the gradually changing low voltage Vout1.

[0078] In one embodiment, the low voltage stabilization module 40 includes a low voltage control module 430. The first end of the low voltage control module 430 is connected to the current mirror module 420, and is used to output a gradually changing low voltage Vout1 according to the output side current. The input end of the bandgap reference module 50 is connected to the first end of the low voltage control module 430 (also known as Figure 4 The second terminal of the low voltage control module 430 (also known as the D terminal) is connected to the reference voltage Vout2 according to the gradually changing low voltage Vout1. Figure 3 and Figure 4 The first switch module 310 is used to control the voltage of the second end of the low voltage control module 430 and the initial start current I C The second switch module 320 is used to control the voltage of the second end of the low voltage control module 430 and the initial start current I C The third terminal of the low voltage control module 430 is grounded.

[0079] In this embodiment, the current mirror module 420 reproduces the branch startup current in proportion to form the output side current. The low voltage control module 430 is connected to the current mirror module 420 and introduces the output side current into the low voltage control module 430. The low voltage control module 430 forms a gradually changing low voltage Vout1 at the output side according to the output side current. The first end (also understood as Figure 4 The voltage at the D terminal in the middle is the ground voltage of the low voltage control module 430. The second terminal of the low voltage control module 430 (also known as Figure 3 and Figure 4 The voltage at the B terminal) is the voltage of the second terminal of the low voltage control module 430 to the ground.

[0080] When the high voltage VIN is powered on, the pre-regulation module 10 and the base tone module 20 work normally in sequence. The initial start-up current I output by the base tone module 20 C The current starts up module 410 and the voltage value of the gradually changing low voltage Vout1 is 0. The voltage value of the reference voltage Vout2 is 0. Furthermore, the second end (also known as Figure 3 and Figure 4 The voltage VB at the B end is 0. The voltage VC at the C point is greater than the voltage VB, that is, VC-VB>Vthp, the first switch module 310 is turned on, and the second switch module 320 is turned off.

[0081] The first switch module 310 is turned on, and the initial turn-on current I C After passing through the first switch module 310, it flows into the A terminal, enters the current start module 410 to form a branch start current, and the branch start current is proportionally reproduced by the current mirror module 420 to form an output side current. The output side current flows through the low voltage control module 430, so that the gradually changing low voltage Vout1 gradually increases, and then the second end of the low voltage control module 430 (also understood as Figure 3 and Figure 4 The voltage VB at the second end (also known as the middle end) of the low voltage control module 430 also gradually increases. Figure 3 and Figure 4 The voltage VB at the B end of the low voltage stabilization module 40 gradually increases, which will increase the voltage at one end of the first switch module 310 and the second switch module 320, thereby controlling the first switch module 310 and the second switch module 320 to be turned on or off. The low voltage control module 430 realizes the gradual low voltage Vout1 at the output end of the low voltage stabilization module 40 and the second end of the low voltage control module 430 (which can also be understood as Figure 3 and Figure 4By regulating the voltage VB at the middle B terminal, the first switch module 310 and the second switch module 320 are regulated to be turned off or on, so as to more accurately make the low voltage stabilization module 40 and the bandgap reference module 50 out of the degenerate state and complete the startup of the entire circuit.

[0082] In one embodiment, the low voltage control module 430 includes a first voltage divider module 431, a second voltage divider module 432 and a third voltage divider module 433. The first end of the first voltage divider module 431 is connected to the input end of the current mirror module 420 and the bandgap reference module 50 respectively. The first end of the second voltage divider module 432 is connected to the second end of the first voltage divider module 431. The first end of the third voltage divider module 433 is connected to the second end of the second voltage divider module 432, and the second end of the third voltage divider module 433 is grounded.

[0083] In this embodiment, the first voltage divider module 431, the second voltage divider module 432 and the third voltage divider module 433 are connected in series and grounded. The current mirror module 420 reproduces the branch startup current of the current startup module 410 in proportion to form an output side current. The output side current is introduced into the first voltage divider module 431, the second voltage divider module 432 and the third voltage divider module 433. The first end of the first voltage divider module 431, the drain of the sixth field effect transistor 421, the output end of the low voltage stabilization module 40 and the input end of the bandgap reference module 50 together form a common connection end D. The first end of the second voltage divider module 432 and the second end of the first voltage divider module 431 form a common end B, which is respectively connected to the gate of the first field effect transistor 311 and the gate of the second field effect transistor 321. By adjusting the voltage VB at the common terminal B, the gate voltage of the first field effect transistor 311 and the gate voltage of the second field effect transistor 321 can be regulated to control the turn-off or turn-on of the first field effect transistor 311 and the second field effect transistor 321, thereby more accurately making the low voltage stabilization module 40 and the bandgap reference module 50 leave the degenerate state and complete the startup of the entire circuit.

[0084] In one embodiment, the first voltage divider module 431 includes at least one resistor. The second voltage divider module 432 includes at least one resistor. The third voltage divider module 433 includes at least one resistor. In one embodiment, the first voltage divider module 431 includes a second resistor R2. The second voltage divider module 432 includes a first resistor R1. The third voltage divider module 433 includes a fourth resistor R0. The gradually changing low voltage Vout1 at the output end of the low voltage stabilization module 40 can also be understood as the voltage of the D end to the ground, and can also be understood as the sum of the voltages of the first voltage divider module 431, the second voltage divider module 432 and the third voltage divider module 433. Specifically, it can be expressed as the gradually changing low voltage Vout1=V D=I*(R0+R1+R2). I represents the output current formed by proportional reproduction of the branch starting current. VB=Vout1*[(R1+R0) / (R0+R1+R2)]. Vfb=Vout1*[(R0) / (R0+R1+R2)].

[0085] In one embodiment, the low voltage stabilization module 40 includes a loop feedback module 440. A first input end of the loop feedback module 440 is connected to an output end of the bandgap reference module 50. A second input end of the loop feedback module 440 is connected to a first end of the third voltage divider module 433. An output end of the loop feedback module 440 is connected to a drain of the first field effect transistor 311 and a first end of the current start module 410, respectively.

[0086] The loop feedback module 440 is used to output a feedback current to the current start module 410 according to the reference voltage and the voltage division of the third voltage divider module 433. The current start module 410 is used to turn on when the first field effect transistor 311 is turned on, and adjust the branch start current according to the high voltage, the pre-adjusted low voltage and the feedback current.

[0087] In this embodiment, the first input terminal of the loop feedback module 440 inputs the output reference voltage Vout2 of the bandgap reference module 50. The second input terminal of the loop feedback module 440 inputs the voltage Vfb of the third voltage divider module 433. The output terminal of the loop feedback module 440, the drain of the first field effect transistor 311 and the first terminal of the current start module 410 form a common terminal A. Specifically, the output terminal of the loop feedback module 440 is connected to the drain of the first field effect transistor 311 and the gate of the third field effect transistor 411, respectively.

[0088] The loop feedback module 440 is used as a feedback element of the reference voltage Vout2 output by the bandgap reference module 50. The reference voltage Vout2 is used as the reference voltage of the loop feedback module 440. The voltage Vfb of the third voltage divider module 433 is used as a real-time voltage that can reflect the voltage change of the low voltage stabilization module 40. The reference voltage Vout2 is compared with the voltage Vfb of the third voltage divider module 433, and the feedback current Iamp is output. The feedback current Iamp flows to the A terminal and is compared with the initial turn-on current I flowing through the first field effect transistor 311. CConverge to the gate of the third field effect transistor 411, and regulate the gradual low voltage Vout1 of the low voltage stabilization module 40. The change of the gradual low voltage Vout1 drives the change of the reference voltage Vout2, and also drives the change of the voltage Vfb of the third voltage divider module 433, forming a feedback loop. The output voltage of the low voltage stabilization module 40 and the bandgap reference module 50 is dynamically adjusted through the feedback loop until the reference voltage Vout2 and the gradual low voltage Vout1 are fully established, and both reach the expected stable value and state, so that the bandgap reference module 50 outputs a stable and high-precision reference voltage Vout2, which serves as the output voltage of the bandgap reference module 50, and provides a stable and high-precision reference voltage for other subsequent circuits in the power supply system.

[0089] When the reference voltage Vout2 and the gradually low voltage Vout1 are in a stable state, Vout2=Vfb, the reference voltage Vout2 and the gradually low voltage Vout1 no longer change, and the relationship between the gradually low voltage Vout1 and the reference voltage Vout2 is:

[0090] Vout1=Vfb*(1+R1 / R0+R2 / R0)=Vout2*(1+R1 / R0+R2 / R0).

[0091] It can be seen from this that when the reference voltage Vout2 and the gradually changing low voltage Vout1 are in a stable state, there is a fixed proportional relationship between the gradually changing low voltage Vout1 and the reference voltage Vout2, which can ensure that the bandgap reference module 50 outputs a stable and high-precision reference voltage Vout2, will not be affected by the surrounding external conditions, and can stably and continuously output a high-precision reference voltage Vout2.

[0092] In one embodiment, the loop feedback module 440 includes at least one amplifier. The comparison between the reference voltage Vout2 and the voltage Vfb of the third voltage divider module 433 is realized by the amplifier. With the reference voltage Vout2 as the reference voltage, the changes of the two are fed back to the low voltage stabilization module 40 in real time, and the dynamic adjustment of the gradually changing low voltage Vout1 and the reference voltage Vout2 is realized until the gradually changing low voltage Vout1 and the reference voltage Vout2 are both stably operated, so that the bandgap reference module 50 outputs a stable and high-precision reference voltage Vout2. Through the amplifier, the loop feedback module 440 realizes an accurate comparison function, and can clearly and accurately judge the relationship between the reference voltage Vout2 and the voltage Vfb of the third voltage divider module 433. When the reference voltage Vout2 is the same as the voltage Vfb of the third voltage divider module 433, a fixed proportional relationship is established between the gradually changing low voltage Vout1 and the reference voltage Vout2, and a stable state is reached, which can ensure that the bandgap reference module 50 outputs a stable and high-precision reference voltage Vout2.

[0093] In one embodiment, the low voltage stabilization module 40 further includes a compensation circuit 450. The first end of the compensation circuit 450 is connected to the drain of the first field effect transistor 311. The first end of the compensation circuit 450 is also connected to the gate of the third field effect transistor 411. The first end of the compensation circuit 450 is also connected to the output end of the loop feedback module 440. The second end of the compensation circuit 450 is grounded. The compensation circuit 450 is an anti-oscillation compensation circuit, which is used to prevent the circuit in which it is located from oscillating and stabilize the circuit in which it is located.

[0094] The compensation circuit 450 can be a capacitor compensation circuit, a resistor-capacitor (RC) compensation circuit, an inductor-capacitor (LC) compensation circuit, a lag compensation circuit, or a lead compensation circuit, or a combination thereof. The compensation circuit 450 can stabilize the entire bandgap reference control circuit 100, so that the reference voltage Vout2 output by the bandgap reference module 50 is more stable, and the accuracy of the reference voltage Vout2 can be greatly improved.

[0095] In one embodiment, the low voltage stabilization module 40 further includes a seventh field effect transistor 460. The gate of the seventh field effect transistor 460 is connected to the pre-regulated low voltage pre_vdd. The source of the seventh field effect transistor 460 is connected to the pre-regulated low voltage pre_vdd and the gate of the fourth field effect transistor 412. The drain of the seventh field effect transistor 460 is connected to the source of the fourth field effect transistor 412. In one embodiment, the seventh field effect transistor 460 can be a P-type MOS tube. Through the seventh field effect transistor 460, a complementary driving structure can be formed with the fourth field effect transistor 412, which can more effectively control the conduction and cutoff of the circuit, and improve the efficiency and performance of the circuit. When the fourth field effect transistor 412 is turned on, the seventh field effect transistor 460 can assist in providing current, improve the current characteristics when turned on, and reduce the on-resistance.

[0096] In one embodiment, the low voltage stabilization module 40 further includes a voltage stabilizing diode 470. The anode terminal of the voltage stabilizing diode 470 is connected to the drain terminal of the fifth field effect transistor 413. The cathode terminal of the voltage stabilizing diode 470 is connected to the high voltage VIN. The voltage stabilizing diode 470 provides overvoltage protection for the fifth field effect transistor 413, so that the fifth field effect transistor 413 is protected from damage by excessively high voltage.

[0097] In one embodiment, the low voltage stabilization module 40 further includes a capacitor 480. One end of the capacitor 480 is connected to the first end of the first voltage divider module 431, and can also be understood as being connected to the common end D. The other end of the capacitor 480 is grounded. By connecting the capacitor 480 in parallel to the output end of the low voltage stabilization module 40, the output voltage can be smoothed, the voltage ripple can be reduced, and a purer DC voltage can be provided. At the same time, by connecting the capacitor 480 in parallel to the output end of the low voltage stabilization module 40, when the load current suddenly increases, the stored charge can be quickly released to supplement the current, thereby avoiding a sharp drop in the output voltage and enhancing the circuit's ability to respond to load changes.

[0098] The present application provides an electronic device, including the bandgap reference control circuit 100 in any of the above embodiments. The electronic device may be a power management device, a communication device, or an industrial control device. The bandgap reference control circuit 100 may provide a stable reference voltage for the electronic device, thereby ensuring stable operation of the electronic device.

[0099] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as examples for illustration. In practical applications, the above-mentioned functional distribution can be completed by different functional units and modules as needed. The functional units and modules in the embodiments can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit, and the above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing from each other, and are not used to limit the scope of protection of this application.

[0100] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0101] Those of ordinary skill in the art will appreciate that the modules of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application. The modules described as separate components may or may not be physically separated. Select some or all of the modules according to actual needs to achieve the purpose of the present embodiment.

[0102] In addition, each functional module in each embodiment of the present application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional units.

[0103] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electric carrier signals and telecommunication signals.

[0104] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A bandgap reference control circuit, characterized in that: It comprises a pre-regulation module (10), a base tone module (20), a first switch module (310), a second switch module (320), a current start module (410), a current mirror module (420), a low voltage control module (430), a loop feedback module (440) and a bandgap reference module (50) connected; The pre-regulation module (10) is used to convert the high voltage generated by the high voltage power supply into a pre-regulated low voltage; The base tone module (20) is connected to the pre-regulation module (10) and is used to convert the pre-regulated low voltage into an initial start-up current; The first switch module (310) is connected to the tone module (20), the first switch module (310) is connected to the second end of the low-voltage control module (430), and the first switch module (310) is used to switch on or off according to the voltage of the second end of the low-voltage control module (430) and the initial start-up current; The second switch module (320) is connected to the tone module (20), the second switch module (320) is connected to the second end of the low-voltage control module (430), and the second switch module (320) is used to turn on or off according to the voltage of the second end of the low-voltage control module (430) and the initial start-up current; The first end of the current starting module (410) is connected to the first switch module (310), the second end of the current starting module (410) is connected to the high voltage power supply, and the third end of the current starting module (410) is connected to the pre-regulation module (10), and the current starting module (410) is used to turn on when the first switch module (310) is turned on, and to generate a branch starting current according to the high voltage and the pre-regulated low voltage; The current mirror module (420) is connected to the fourth end of the current starting module (410), the current mirror module (420) is connected to the high-voltage power supply, and the current mirror module (420) is used to proportionally reproduce the branch starting current to form an output side current; A first end of the low voltage control module (430) is connected to the current mirror module (420) and is used to output a gradually changing low voltage according to the output side current, and a third end of the low voltage control module (430) is grounded; The input end of the bandgap reference module (50) is connected to the first end of the low voltage control module (430) and is used to output a reference voltage according to the gradually changing low voltage; The first input end of the loop feedback module (440) is connected to the output end of the bandgap reference module (50), the second input end of the loop feedback module (440) is connected to the fourth end of the low voltage control module (430), the output end of the loop feedback module (440) is connected to the first end of the current start module (410), and the loop feedback module (440) is used to output a feedback current to the current start module (410) according to the reference voltage and the voltage at the fourth end of the low voltage control module (430), so as to regulate the gradually changing low voltage.

2. The bandgap reference control circuit according to claim 1, characterized in that: The low voltage control module (430) comprises: A first voltage dividing module (431), wherein a first end of the first voltage dividing module (431) is respectively connected to input ends of the current mirror module (420) and the bandgap reference module (50); a second voltage dividing module (432), wherein a first end of the second voltage dividing module (432) is connected to a second end of the first voltage dividing module (431); A third voltage dividing module (433), wherein a first end of the third voltage dividing module (433) is connected to a second end of the second voltage dividing module (432), and a second end of the third voltage dividing module (433) is grounded.

3. The bandgap reference control circuit according to claim 2, characterized in that: The first switch module (310) comprises: A first field effect transistor (311), wherein a gate of the first field effect transistor (311) is connected to a first end of the second voltage dividing module (432), a source of the first field effect transistor (311) is connected to the base tone module (20), and a drain of the first field effect transistor (311) is connected to a first end of the current starting module (410).

4. The bandgap reference control circuit according to claim 2, characterized in that: The second switch module (320) comprises: A second field effect transistor (321), wherein the gate of the second field effect transistor (321) is connected to the first end of the second voltage dividing module (432), the drain of the second field effect transistor (321) is connected to the base tone module (20), and the source of the second field effect transistor (321) is grounded.

5. The bandgap reference control circuit according to claim 3, characterized in that: The first input end of the loop feedback module (440) is connected to the output end of the bandgap reference module (50), the second input end of the loop feedback module (440) is connected to the first end of the third voltage divider module (433), and the output end of the loop feedback module (440) is respectively connected to the drain of the first field effect transistor (311) and the first end of the current start module (410); The loop feedback module (440) is used to output a feedback current to the current starting module (410) according to the reference voltage and the voltage division of the third voltage division module (433); The current starting module (410) is used to start when the first field effect transistor (311) is turned on, and to adjust the branch starting current according to the high voltage, the pre-adjusted low voltage and the feedback current.

6. An electronic device, characterized in that: A control circuit comprising a bandgap reference as claimed in any one of claims 1 to 5.

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