Low-voltage power supply generation circuit and integrated circuit

Abstract

The application provides a low-voltage power supply generation circuit and an integrated circuit. The low-voltage power supply generation circuit comprises a starting module configured to generate a bias signal according to a high-voltage power supply signal; and a low-voltage power supply signal generation module comprising connected transistor elements and resistance elements, the low-voltage power supply signal generation module being configured to start according to the bias signal and output a low-voltage power supply signal with driving capability at a common node of the resistance elements and the transistor elements after starting, the low-voltage power supply signal being smaller than the high-voltage power supply signal, wherein the low-voltage power supply signal generation module comprises a negative feedback loop configured to perform negative feedback control on the low-voltage power supply signal according to a feedback signal of an output end. The application optimizes the circuit structure of the low-voltage power supply generation circuit, and negative feedback control on the low-voltage power supply signal can be achieved without using a reference voltage, thereby reducing the cost and power consumption of the low-voltage power supply generation circuit.

Description

Technical Field

[0001] This application relates to the field of integrated circuit technology, specifically to a low-voltage power supply generating circuit and integrated circuit. Background Technology

[0002] For power management ICs, systems typically require the chip to operate within an input voltage range of several volts to tens of volts. For high-voltage power management chips, a common power solution divides the internal circuitry into high-voltage and low-voltage modules. The sub-circuits that interface with the input power supply are usually classified as high-voltage modules, while internal components such as reference circuits, clock circuits, amplifiers, comparators, converters, and digital logic circuits are classified as low-voltage modules. This approach maximizes chip area savings, reduces design complexity and cost, and minimizes power consumption.

[0003] For ICs powered by high-voltage power supplies, the high-voltage circuit modules are powered directly by an external power source, while the low-voltage circuit modules require power generation within the chip. An external power source generates a constant low-voltage supply to power the internal low-voltage circuits. The external power supply for high-voltage ICs varies considerably, typically ranging from volts to tens of volts. Since low-voltage circuits generally require a more stable power supply, the high-voltage power supply needs to be converted to a stable and reliable low-voltage power source.

[0004] Traditional low-voltage power generation circuits, such as Figure 1 As shown, the circuit mainly includes a startup circuit 1, a reference voltage generation circuit 2, and an LDO voltage regulator circuit 3. The startup circuit 1 generates a bias current Ibias or a bias voltage Vbias based on the high-voltage power supply signal VHV. The reference voltage generation circuit 2 receives the bias voltage Ibias or Vbias generated by the startup circuit 1, generates a positive temperature coefficient voltage and a negative temperature coefficient voltage, and combines them in a certain ratio to generate a zero-temperature coefficient bandgap reference voltage Vbg. The LDO voltage regulator circuit 3 outputs a VLV voltage with a certain driving capability based on the bandgap reference voltage Vbg generated by the reference voltage generation circuit 2, which is used as the power supply for the internal low-voltage circuit. However, traditional low-voltage power generation circuit schemes require three separate sub-modules, resulting in high overall power consumption and high chip cost.

[0005] Therefore, it is necessary to provide improved technical solutions to overcome the above-mentioned technical problems existing in the prior art. Summary of the Invention

[0006] To address the aforementioned technical problems, this application provides a low-voltage power generation circuit and integrated circuit, which can solve the problems of high cost and high power consumption in traditional solutions.

[0007] According to a first aspect of the present application, a low-voltage power supply circuit is provided, comprising:

[0008] a start-up module comprising at least one resistive element and at least one transistor element, the start-up module being configured to generate a bias signal based on a high-voltage power supply signal;

[0009] a low-voltage power supply signal generation module comprising at least one resistive element and at least one transistor element, the low-voltage power supply signal generation module being configured to start up based on the bias signal and output a low-voltage power supply signal having a driving capability after starting up, the low-voltage power supply signal being smaller than the high-voltage power supply signal,

[0010] wherein the low-voltage power supply signal generation module comprises a negative feedback loop configured to perform negative feedback control on the low-voltage power supply signal based on a feedback signal from an output terminal.

[0011] Optionally, the low-voltage power supply signal generation module generates a positive temperature coefficient voltage, and outputs the low-voltage power supply signal based on the positive temperature coefficient voltage and the feedback signal.

[0012] Optionally, the low-voltage power supply signal generation module comprises a negative feedback loop,

[0013] the negative feedback loop comprises a first current path and a second current path constituting a first current mirror, the negative feedback loop being configured to generate the control terminal signal based on a first current and a third current on the first current path, the first current and the third current representing currents of different portions on the first current path, respectively,

[0014] the negative feedback loop is configured to adjust a second current on the second current path and the first current and the third current on the first current path based on the feedback signal.

[0015] Optionally, when the feedback signal changes, a change amount of the first current is greater than a change amount of the third current.

[0016] Optionally, the start-up module and the negative feedback circuit share at least one element.

[0017] Optionally, the transistor element is coupled between a high-voltage power supply terminal and an output terminal of the low-voltage power supply circuit, and is configured to adjust the low-voltage power supply signal based on the control terminal signal.

[0018] a first end of the resistive element is coupled to the low-voltage power supply signal output terminal, and is configured to feed back the low-voltage power supply signal and output the feedback signal at a second end.

[0019] Optionally, the transistor element is coupled between an output terminal of the low-voltage power supply generating circuit and a reference ground for adjusting the low-voltage power supply signal according to the control terminal signal, the low-voltage power supply signal representing a potential difference between a high-voltage power supply terminal and the output terminal of the low-voltage power supply generating circuit.

[0020] The resistance element is coupled in series with a third resistance between the low-voltage power supply signal output terminal and the high-voltage power supply terminal for feeding back the low-voltage power supply signal and outputting the feedback signal at a connection node of the resistance element and the third resistance.

[0021] Optionally, the negative feedback loop is further configured to adjust a current of the starting circuit based on the third current and the second current.

[0022] Optionally, the starting module comprises:

[0023] a first transistor and a third transistor constituting a second current mirror, a current input terminal of the first transistor being coupled with a high-voltage power supply terminal through a first resistance, a current output terminal of the first transistor being coupled with a reference ground, a current output terminal of the third transistor being coupled with the reference ground,

[0024] the starting module generating the bias signal at a current input terminal of the third transistor.

[0025] Optionally, the negative feedback loop comprises:

[0026] a fourth transistor and a fifth transistor constituting a first current mirror, current input terminals of the fourth transistor and the fifth transistor being coupled with a high-voltage power supply terminal;

[0027] a second transistor, a current input terminal of the second transistor being coupled with a current output terminal of the fourth transistor, a current output terminal of the second transistor being coupled with a reference ground;

[0028] the third transistor, a current input terminal of the third transistor being coupled with a current output terminal of the fifth transistor, a control terminal of the third transistor receiving the feedback signal;

[0029] a second resistance, a first terminal of the second resistance being coupled with a control terminal of the second transistor, a second terminal of the second resistance being coupled with a control terminal of the third transistor;

[0030] wherein the fourth transistor and the second transistor constitute a first current path in the negative feedback loop, the fifth transistor and the third transistor constitute a second current path in the negative feedback loop, and the first current represents a current flowing through the fourth transistor, and the third current represents a current flowing through the second transistor.

[0031] The negative feedback loop generates the control terminal signal at the current output terminal of the fourth transistor, and the low-voltage power signal generation module generates a positive temperature coefficient voltage across the second resistor.

[0032] Optionally, the starting module comprises:

[0033] A first transistor, a current input terminal of which is coupled to a high-voltage power terminal through a first resistor, and a current output terminal of which is coupled to a reference ground;

[0034] A second transistor, a control terminal of which is coupled to the current input terminal of the first transistor, and a current output terminal of which is coupled to the control terminal of the first transistor,

[0035] The starting module generates the bias signal at the current input terminal of the second transistor.

[0036] Optionally, the negative feedback loop comprises:

[0037] A fourth transistor and a fifth transistor constituting a first current mirror, current input terminals of the fourth transistor and the fifth transistor being coupled to a high-voltage power terminal;

[0038] The first transistor;

[0039] The second transistor, a current input terminal of which is coupled to the current output terminal of the fourth transistor;

[0040] A third transistor, a current input terminal of which is coupled to the current output terminal of the fifth transistor, a current output terminal of which is coupled to the control terminal of the first transistor, and a control terminal of which receives the feedback signal;

[0041] A second resistor, a first terminal of which is coupled to the control terminal of the second transistor, and a second terminal of which is coupled to the control terminal of the third transistor;

[0042] Wherein, the fourth transistor and the second transistor constitute a first current path in the negative feedback loop, the fifth transistor and the third transistor constitute a second current path in the negative feedback loop, and the first current represents a current flowing through the fourth transistor, and the third current represents a current flowing through the second transistor.

[0043] The negative feedback loop generates the control terminal signal at the current output terminal of the fourth transistor, and the low-voltage power signal generation module generates a positive temperature coefficient voltage across the second resistor.

[0044] Optionally, the low-voltage power signal generation module further comprises:

[0045] a fifth resistor coupled between the control terminal of the first transistor and a reference ground.

[0046] Optionally, the negative feedback loop further comprises:

[0047] a fourth resistor coupled between the second terminal of the resistive element and the reference ground.

[0048] Optionally, at least one of the second transistor, the third transistor, the fourth transistor and the fifth transistor is configured to be composed of a plurality of transistors of the same specification in parallel,

[0049] a ratio of the number of transistors in parallel of the second transistor to the third transistor is N1, and a ratio of the number of transistors in parallel of the fourth transistor to the fifth transistor is N2, wherein N1 and N2 are both positive numbers, and a product of N1 and N2 is a preset fixed value.

[0050] Optionally, the starting module comprises:

[0051] a first transistor, a current input terminal of which is coupled with a high-voltage power supply terminal, and a current output terminal of which is coupled with a reference ground through a first resistor;

[0052] a second transistor, a control terminal of which is coupled with the current output terminal of the first transistor, and a current input terminal of which is coupled with the control terminal of the first transistor,

[0053] the starting module generates the bias signal at a current output terminal of the second transistor.

[0054] Optionally, the negative feedback loop comprises:

[0055] a fourth transistor and a fifth transistor constituting a first current mirror, current output terminals of the fourth transistor and the fifth transistor being coupled with a reference ground;

[0056] the first transistor;

[0057] the second transistor, a current output terminal of which is coupled with a current input terminal of the fourth transistor;

[0058] a third transistor, a current input terminal of which is coupled with a control terminal of the first transistor, a current output terminal of which is coupled with a current input terminal of the fifth transistor, and a control terminal of which receives the feedback signal;

[0059] a second resistor, a first terminal of which is coupled with a control terminal of the second transistor, and a second terminal of which is coupled with a control terminal of the third transistor;

[0060] The fourth transistor and the second transistor form a first current path in the negative feedback loop, the fifth transistor and the third transistor form a second current path in the negative feedback loop, and the first current represents a current flowing through the fourth transistor, and the third current represents a current flowing through the second transistor.

[0061] The negative feedback loop generates the control terminal signal at a current input terminal of the fourth transistor, and the low-voltage power supply signal generation module generates a positive temperature coefficient voltage across the second resistor.

[0062] According to a second aspect of the present application, an integrated circuit is provided, comprising:

[0063] at least one low-voltage circuit module;

[0064] The low-voltage power supply generation circuit according to any one of the embodiments of the present application is used to provide a low-voltage power supply signal with driving capability for the at least one low-voltage circuit module according to the high-voltage power supply signal.

[0065] The beneficial effects of the present application at least include:

[0066] In the low-voltage power supply generation circuit provided by the embodiments of the present application, after the low-voltage power supply signal generation module is started according to the bias signal output by the starting module, the low-voltage power supply signal can be controlled by negative feedback according to the feedback signal at the output terminal without using a reference voltage, so that a low-voltage power supply signal with driving capability is stably output. The sub-circuit module for generating a reference voltage and the LDO sub-module for generating a low-voltage power supply signal according to the reference voltage in the traditional low-voltage power supply generation circuit are integrated and optimized, so that the number of required components is less, and the circuit structure is simpler. Therefore, compared with the prior art, the overall power consumption and cost of the circuit can be reduced.

[0067] It should be noted that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0068] Figure 1 A structural block diagram of an existing low-voltage power supply generation circuit is shown;

[0069] Figure 2 A structural schematic diagram of a low-voltage power supply generation circuit according to the first embodiment of the present application is shown;

[0070] Figure 3 A structural schematic diagram of a low-voltage power supply generation circuit according to the second embodiment of the present application is shown;

[0071] Figure 4Fig. 1 shows a structural schematic diagram of a low-voltage power supply generating circuit according to a third embodiment of the present application;

[0072] Figure 5 Fig. 2 shows a structural schematic diagram of a low-voltage power supply generating circuit according to a fourth embodiment of the present application;

[0073] Figure 6 Fig. 3 shows a structural schematic diagram of a low-voltage power supply generating circuit according to a fifth embodiment of the present application. DETAILED DESCRIPTION

[0074] In order to make the present application more comprehensible, the present application will be described more fully with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0075] The technical solution disclosed in the embodiments of the present application is mainly to integrate the starting module, the reference voltage generating module and the LDO module in the traditional low-voltage power supply generating circuit in the same circuit, and share some elements with each other, so as to achieve the purpose of simplifying the circuit structure, reducing the cost and power consumption.

[0076] Generally speaking, the withstand voltage between the gate oxide will not be higher than 5V or 6V, so the working voltage of the CMOS inside the chip will generally not be higher than 5V or 6V, and 5V is usually taken as the voltage limit, and the input voltage lower than 5V is regarded as low voltage, and the input voltage higher than 5V is regarded as high voltage. Of course, according to the specific selection, the distinction limit can be adjusted accordingly.

[0077] Embodiment one

[0078] The circuit structure of the low-voltage power supply generating circuit provided in the embodiment is shown in Figure 2

[0079] Specifically, the low-voltage power supply generating circuit provided in the embodiment includes a starting module 10 and a low-voltage power supply signal generating module 20.

[0080] The starting module 10 is used to generate a bias signal according to a high-voltage power supply signal VHV.

[0081] In the embodiment, the starting module 10 further includes a transistor Q1, a transistor Q2 and a resistor R1. Wherein, the current input end of the transistor Q1 is coupled with the high-voltage power supply end VHV through the resistor R1, and the current output end of the transistor Q1 is coupled with the reference ground; the control end of the transistor Q2 is coupled with the current input end of the transistor Q1, and the current output end of the transistor Q2 is coupled with the control end of the transistor Q1. The starting module 10 generates a bias signal at the current input end of the transistor Q2. ​

[0082] The low-voltage power signal generation module 20 is coupled with the starting module 10, and is used to realize starting according to the bias signal generated by the starting module 10, and output a low-voltage power signal VLV with driving capability after starting. It can be understood that the voltage value of the low-voltage power signal VLV is less than the voltage value of the high-voltage power signal VHV.

[0083] The low-voltage power signal generation module 20 further comprises a transistor M3, a feedback unit 22 and a negative feedback loop 21.

[0084] The transistor M3 is coupled between the high-voltage power supply end VHV and the low-voltage power signal output end (hereinafter referred to as the output end) of the low-voltage power generation circuit, and the control end of the transistor M3 receives the control end signal Va, which is used to adjust the low-voltage power signal VLV according to the control end signal Va. In the embodiment, the low-voltage power signal VLV represents the potential difference between the low-voltage power signal output end and the reference ground.

[0085] The feedback unit 22 is coupled with the output end of the low-voltage power generation circuit, and is used to sample and feed back the low-voltage power signal VLV and output a feedback signal Vb, wherein the feedback signal Vb has a negative temperature coefficient. For example, in the embodiment, the feedback unit 22 comprises a resistor R3, the first end of the resistor R3 is coupled with the output end of the low-voltage power generation circuit, and the feedback unit 22 outputs the feedback signal Vb at the second end of the resistor R3.

[0086] The negative feedback loop 21 is coupled with the feedback unit 22 and the transistor M3 respectively, and realizes starting by receiving the bias signal generated by the starting module 10. The negative feedback loop 21 is used to adjust the control end signal Va according to the feedback signal Vb after starting, and generate a stable positive temperature coefficient voltage when the loop is in a stable state. In the embodiment, taking the transistor M3 as a PMOS transistor as an example, the feedback signal Vb increases, for example, with the increase of the low-voltage power signal VLV, and the feedback signal Vb adjusts the control end signal Va to increase after the increase, but the increased control end signal Va adjusts the low-voltage power signal VLV to decrease, the feedback signal Vb decreases, for example, with the decrease of the low-voltage power signal VLV, and the feedback signal Vb adjusts the control end signal Va to decrease after the decrease, but the decreased control end signal Va adjusts the low-voltage power signal VLV to increase, so as to realize the negative feedback adjustment of the low-voltage power signal VLV.

[0087] The negative feedback loop 21 comprises a first current path and a second current path constituting a first current mirror.

[0088] In the embodiment, the negative feedback loop 21 further comprises: transistor Q1, transistor Q2, transistor Q3, transistor M1, transistor M2 and resistor R2. The transistor M1 and the transistor M2 constitute a first current mirror, and the current input ends of the transistor M1 and the transistor M2 are coupled with the high-voltage power supply end VHV; the current input end of the transistor Q2 is coupled with the current output end of the transistor M1; the current input end of the transistor Q3 is coupled with the current output end of the transistor M2, the current output end of the transistor Q3 is coupled with the control end of the transistor Q1, and the control end of the transistor Q3 receives the feedback signal Vb, that is, the control end of the transistor Q3 is coupled with the second end of the resistor R3; the first end of the resistor R2 is coupled with the control end of the transistor Q2, and the second end of the resistor R2 is coupled with the control end of the transistor Q3.

[0089] In the embodiment, the transistor M1 and the transistor Q2 constitute a first current path in the negative feedback loop 21, and the transistor M2 and the transistor Q3 constitute a second current path in the negative feedback loop 21. The negative feedback loop 21 generates the control end signal Va at the current output end of the transistor M1, and the low-voltage power supply signal generation module 20 generates the positive temperature coefficient voltage across the resistor R2 in the stable state.

[0090] Optionally, the transistor Q1, the transistor Q2, the transistor Q3, the transistor M1, the transistor M2 and the transistor M3 can be selected from at least one of a field effect transistor and a bipolar junction transistor. In the embodiment, only the transistor Q1, the transistor Q2 and the transistor Q3 are NPN transistors, and the transistor M1, the transistor M2 and the transistor M3 are PMOS transistors, which are exemplarily described. It can be understood that, for the NPN transistor, the control end corresponds to the base, the current input end corresponds to the collector, and the current output end corresponds to the emitter; for the PMOS transistor, the control end corresponds to the gate, the current input end corresponds to the source, and the current output end corresponds to the drain.

[0091] At least one of the transistor Q2, the transistor Q3, the transistor M1 and the transistor M2 is configured to be composed of a plurality of transistors of the same specification in parallel, so as to realize different width-length ratios or emission junction ratios. For example, the ratio of the number of transistors in parallel of the transistor Q2 and the transistor Q3 is N1, the ratio of the number of transistors in parallel of the transistor M2 and the transistor M1 is N2, N1 and N2 are positive numbers, and the product of N1 and N2 is a preset fixed value. For example, N1 can be set to 1 and N2 can be set to 8, or N1 can be set to 8 and N2 can be set to 1.

[0092] In the starting stage, the high-voltage power supply signal VHV starts to rise, the transistor Q2 is gradually turned on, the starting module 10 generates a bias signal at the collector of the transistor Q2, and the potential of the collector of the transistor Q2 is gradually pulled down. When the potential of the collector of the transistor Q2 is pulled down to less than a certain value, the transistor M3 starts to conduct, and the low-voltage power supply signal generation module 20 is started. Wherein, the transistor Q2 controls the transistor Q1 to gradually turn on after being turned on, thereby slowing down the pull-down speed of the potential of the collector of the transistor Q2, which is beneficial to realize the smooth start of the low-voltage power supply signal generation module 20.

[0093] Optionally, the bias signal can be a voltage signal (for example, corresponding to the potential of the collector of the transistor Q2), or a current signal (for example, corresponding to the current flowing into the collector of the transistor Q2). It should be noted that the bias signal and the control end signal Va described herein are formed at the same node (i.e. the connection node of the transistor Q2 and the transistor M1), and the two correspond to the different functional descriptions of the signal at the node in different stages. Specifically, the bias signal represents that the signal at the node is used to realize the start of the low-voltage power supply signal generation module 20 in the starting stage, and the control end signal Va represents that the signal at the node is used to realize the adjustment of the low-voltage power supply signal VLV based on the negative feedback loop 21 after the low-voltage power supply signal generation module 20 is started. This kind of expression mode is intended to more clearly show the technical solutions provided by the embodiments of the application, and should not be regarded as a limitation of the application.

[0094] After the low-voltage power supply signal generation module 20 is started, the low-voltage power supply signal VLV starts to increase, at the same time, the negative feedback loop 21 composed of the transistor Q1, the transistor Q2, the transistor Q3, the transistor M1 and the transistor M2 adjusts the low-voltage power supply signal VLV by negative feedback, and when the negative feedback loop 21 reaches a stable state, a positive temperature coefficient voltage is generated across the resistor R2, and together with the feedback signal Vb with a negative temperature coefficient, the required low-voltage power supply signal VLV with a low temperature coefficient or even a zero temperature coefficient is realized.

[0095] In the embodiment, the process of negative feedback loop 21 performing negative feedback includes: in the dynamic adjustment process, adjusting the base current of transistor Q3 according to feedback signal Vb, thereby adjusting the second current (denoted as I2) on the second current path, and adjusting the first current (denoted as I1) flowing through transistor M1 on the first current path based on the first current mirror; at the same time, adjusting the voltage at the first end of resistor R2, i.e., adjusting the base current of transistor Q2 according to feedback signal Vb, thereby adjusting the third current (denoted as I3) flowing through transistor Q2 on the first current path, so as to adjust control end signal Va based on the change of first current I1 and third current I3 on the first current path of the first current mirror; adjusting the conduction degree of transistor M3 according to control end signal Va, thereby adjusting low-voltage power supply signal VLV. It can be seen that, in the process of adjusting the current on the first current path of the first current mirror in the embodiment, the control end signal Va can be negatively fed back based on feedback signal Vb, so that the loop can quickly reach a stable state, and the feedback effect is good.

[0096] It can be understood that in the dynamic adjustment process when the feedback signal Vb changes, the change amount of the first current I1 is greater than the change amount of the third current I3, so that the voltage of the control end signal Va can increase when the feedback signal Vb increases, or decrease when the feedback signal Vb decreases. In specific implementation, when the feedback signal Vb increases with the increase of the low-voltage power supply signal VLV, the base current of the transistor Q3 increases, so that the second current I2 increases, and based on the first current mirror, the first part of the current in the first current path of the first current mirror, that is, the first current I1 flowing through the transistor M1, increases. At the same time, the increasing feedback signal Vb also increases the base current of the transistor Q2 based on the resistance R2, so that the second part of the current in the first current path of the first current mirror, that is, the third current I3 flowing through the transistor Q2, increases. However, based on the working principle of the circuit, it can be known that the increase degree of the first current I1 is greater than the increase degree of the third current I3, which is manifested as that the pull-up degree of the first current I1 to the node voltage, that is, the control end signal Va, is greater than the pull-down degree of the third current I3 to the node voltage, that is, the control end signal Va, and the control end signal Va increases with the increase of the feedback signal Vb. When the feedback signal Vb decreases with the decrease of the low-voltage power supply signal VLV, the base current of the transistor Q3 decreases, so that the second current I2 decreases, and based on the first current mirror, the first part of the current in the first current path of the first current mirror, that is, the first current I1 flowing through the transistor M1, decreases. At the same time, the decreasing feedback signal Vb also decreases the base current of the transistor Q2 based on the resistance R2, so that the second part of the current in the first current path of the first current mirror, that is, the third current I3 flowing through the transistor Q2, decreases. However, based on the working principle of the circuit, it can be known that the decrease degree of the first current I1 is greater than the decrease degree of the third current I3, which is manifested as that the pull-up degree of the first current I1 to the node voltage, that is, the control end signal Va, is less than the pull-down degree of the third current I3 to the node voltage, that is, the control end signal Va, and the control end signal Va decreases with the decrease of the feedback signal Vb.

[0097] It can be understood that when the negative feedback loop 21 reaches a stable state, the first current I1 is equal to the third current I3, and the control end signal Va is stabilized at a certain voltage value.

[0098] At the same time Figure 2 In the example shown, the base current of the transistor Q1 can also be adjusted based on the third current I3 and the second current I2 to stabilize the base voltage of the transistor Q2, and further to make the feedback signal Vb recover to stability faster. The same negative feedback effect is achieved, and the stability of the system is further improved.

[0099] Reference Figure 2When the negative feedback loop 21 reaches a stable state, the low-voltage power supply signal VLV can be regarded as being obtained by combining the positive temperature coefficient voltage across resistor R3 and the feedback signal Vb with a negative temperature coefficient. Therefore, the low-voltage power supply signal VLV can also have zero temperature coefficient or close to zero temperature coefficient.

[0100] Furthermore, during the generation of the low-voltage power signal VLV, the low-voltage power signal generation module 20 also includes signal amplification of at least one of the positive temperature coefficient voltage and the feedback signal Vb, to facilitate adjustment of the voltage value of the output low-voltage power signal VLV. In some examples, the low-voltage power signal generation module 20 is configured, for example, to use a resistor divider network to implement feedback during voltage division feedback for signal amplification. Since only a resistor divider network is needed to simultaneously achieve both signal feedback and signal amplification functions, the number of components required in the circuit can be reduced, which helps to simplify the circuit structure.

[0101] For example, assuming that a voltage divider network with a voltage divider coefficient of k1 (k1 is less than 1) is used to divide and feed back the voltage signal V1 to obtain the voltage signal V2, then:

[0102] V2=k1*V1(1),

[0103] Formula (1) above can be used to represent the process of voltage divider feedback using a resistor voltage divider network. Furthermore, after equivalent transformation, formula (1) becomes:

[0104]

[0105] because Since the value is greater than 1, the above formula (2) can be used to represent the feedback process when using a resistor voltage divider network to achieve voltage divider feedback, which is equivalent to using a voltage divider network with an amplification factor of 1. The voltage divider network amplifies the voltage signal V2.

[0106] Furthermore, the low-voltage power signal generation module 20 generates the low-voltage power signal VLV by applying a positive temperature coefficient voltage to the generation node of the feedback signal Vb. This allows for the sharing of at least one resistor element when designing circuit structures that amplify the positive temperature coefficient voltage and the feedback signal Vb separately, and when designing circuit structures that provide feedback for the low-voltage power signal VLV, thereby further reducing the number of components required and the power consumption of the circuit.

[0107] refer to Figure 2 In this embodiment, a positive temperature coefficient voltage is applied to the second end of resistor R3. Thus, resistor R3 can not only provide feedback to the low-voltage power supply signal VLV, but also amplify the positive temperature coefficient voltage in conjunction with resistor R2 when the low-voltage power supply signal VLV is generated.

[0108] It can be understood that, when the negative feedback loop 21 reaches a steady state, the positive temperature coefficient voltage generated at both ends of the resistor R2, i.e. the voltage drop across the resistor R2, also corresponds to the difference between the base-emitter voltages of the transistor Q2 and the transistor Q3 (denoted as ΔV BE ), and thus can be expressed by the following formula:

[0109]

[0110] where K is the Boltzmann constant, T is the temperature (in Kelvin), q is equal to the Coulomb constant, N1 is the ratio of the characteristic currents of the transistor Q2 and the transistor Q3, i.e. the ratio of the number of transistors in parallel for the transistor Q2 and the transistor Q3, respectively, and N2 is the ratio of the characteristic currents of the transistor M2 and the transistor M1, i.e. the ratio of the number of transistors in parallel for the transistor M2 and the transistor M1, respectively.

[0111] It can be understood that, when the negative feedback loop 21 reaches a steady state, the feedback signal Vb also corresponds to the sum of the base-emitter voltages of the transistor Q3 and the transistor Q1, and thus can be expressed by the following formula:

[0112] Vb = 2 * V BE (4).

[0113] It can be understood that, in the steady state, the low-voltage power supply signal VLV can be expressed by the following formula:

[0114]

[0115] where R2 and R3 represent the resistance values of the resistor R2 and the resistor R3, respectively.

[0116] It can be seen that the low-voltage power supply signal VLV is a proportionally weighted sum of the positive temperature coefficient voltage ΔV BE and the negative temperature coefficient voltage V BE , and thus can also have a relatively low temperature coefficient. Moreover, by adjusting the resistance values of the resistor R2 and / or the resistor R3, low-voltage power supply signals VLV with different voltage values can be output.

[0117] It can be understood that in the embodiment, on the one hand, the starting module 10 and the low-voltage power signal generation module 20 share at least one element (including transistor Q1 and transistor Q2) with each other when implementing respective functions; on the other hand, the low-voltage power signal generation module 20 can obtain a positive temperature coefficient voltage in the process of controlling the loop stability according to the feedback signal Vb by using the negative feedback loop 21, and directly synthesizes the positive temperature coefficient voltage and the feedback signal Vb to obtain a low-voltage power signal VLV with a lower temperature coefficient by using the characteristic that the feedback signal Vb has a negative temperature coefficient. Compared with the prior art scheme of first obtaining a reference voltage with a lower temperature coefficient according to the positive temperature coefficient voltage and the negative temperature coefficient voltage, and then obtaining the low-voltage power signal VLV according to the reference voltage and the feedback signal Vb by negative feedback, the technical scheme provided in the embodiment is equivalent to integrating and optimizing the process of obtaining the reference voltage and the process of obtaining the low-voltage power signal VLV according to the reference voltage. That is, the low-voltage power signal generation module 20 in the embodiment can be regarded as the result of integrating and optimizing the reference voltage generation module and the LDO voltage stabilizing module in the prior art. Different from the prior art scheme of first generating a reference voltage with a low temperature coefficient (such as a bandgap reference voltage), and then controlling the low-voltage power signal by negative feedback according to the reference voltage to obtain a stable low-voltage power signal, the embodiment of the present application does not need to generate a reference voltage with a low temperature coefficient, and can directly realize negative feedback control of the low-voltage power signal according to the feedback signal at the output end. The positive temperature coefficient voltage is obtained at the same time, and the low-voltage power signal with a low temperature coefficient (such as zero temperature coefficient) is obtained based on the positive temperature coefficient voltage and the feedback signal with a negative temperature coefficient. Since the positive temperature coefficient voltage, the negative temperature coefficient voltage and the low-voltage power signal are all established based on the same negative feedback loop, the signal processing process and the circuit structure of the embodiment of the present application are simpler, the response speed is faster, and the overall power consumption and cost of the circuit are greatly reduced under the condition of realizing the same predetermined function.

[0118] Embodiment Two

[0119] The low-voltage power supply generation circuit provided in the embodiment is as shown in Figure 3 .

[0120] Specifically, the low-voltage power supply generation circuit provided in the embodiment basically adopts the same structure as that of the above-mentioned embodiment one, and thus will not be described again.

[0121] The difference is that: in the embodiment, the feedback unit 22 further includes: a resistor R4 coupled between the second end of the resistor R3 and the reference ground. In this way, when the low-voltage power supply signal VLV is generated, the resistor R4 cooperates with the resistor R3 to amplify the negative temperature coefficient voltage, i.e. the feedback signal Vb. And due to the sharing of the resistor R3, only one resistor R4 needs to be added to realize the signal amplification of the feedback signal Vb, and the number of components to be added is less, which is conducive to reducing power consumption.

[0122] It can be understood that in the steady state, the low-voltage power supply signal VLV can be represented by the following formula in the embodiment:

[0123]

[0124] Wherein, R2, R3 and R4 represent the resistance values of the resistor R2, the resistor R3 and the resistor R4, respectively.

[0125] Based on the present embodiment, more precise adjustment of the low-voltage power supply signal VLV and its temperature coefficient can be realized, so that the low-voltage power supply generation circuit can be applied to scenarios with high precision requirements for the low-voltage power supply signal VLV output and the temperature coefficient of the low-voltage power supply signal VLV.

[0126] Embodiment three

[0127] The low-voltage power supply generation circuit provided in the embodiment is as shown in Figure 4 .

[0128] Specifically, the low-voltage power supply generation circuit provided in the embodiment basically adopts the same structure as the above-mentioned embodiment one or embodiment two, and therefore will not be described again.

[0129] The difference is that: in the embodiment, the low-voltage power supply signal generation module 20 further includes: a resistor R5 coupled between the control end of the transistor Q1 and the reference ground.

[0130] It can be understood that, as shown in Figure 3 , in the case where the resistor R5 is not provided, the sum of the bias currents of the transistor Q2 and the transistor Q3 in the low-voltage power supply generation circuit, i.e. the sum of the third current I3 and the second current I2, is:

[0131]

[0132] In the embodiment, as shown in Figure 4 , in the case where the resistor R5 is provided, the sum of the bias currents of the transistor Q2 and the transistor Q3 is:

[0133]

[0134] Wherein, I BE_Q1The base current of the transistor Q1 is strongly related to the high-voltage power supply signal VHV, and I R5 The current flowing through the resistor R5, and β represents the current amplification factor of the transistor Q1.

[0135] Comparing formula (7) and formula (8), it can be seen that, in the embodiment, because the resistor R5 is arranged in the low-voltage power supply generation circuit, the proportion of the base current of the transistor Q1 in the sum of the bias currents of the transistor Q2 and the transistor Q3 can be reduced by increasing the current I R5 (For example, reducing the resistance value of the resistor R5), thereby reducing the influence of the high-voltage power supply signal VHV on the bias currents of the transistor Q2 and the transistor Q3, and improving the power supply rejection effect of the circuit.

[0136] Embodiment Four

[0137] The low-voltage power supply generation circuit provided in the embodiment is as shown in Figure 5 .

[0138] Specifically, the low-voltage power supply generation circuit provided in the embodiment basically adopts the same structure as that of the above-mentioned embodiment one or embodiment two, and thus will not be described again.

[0139] The difference lies in that, in the embodiment, the starting module 10 adopts a structure different from that of the foregoing embodiments, and the connection relationship between the starting module 10 and the low-voltage power supply signal generation module 20 is also different from that of the foregoing embodiments.

[0140] Specifically, in the embodiment, the starting module 10 includes the transistor Q1, the transistor Q3, and the resistor R1. The transistor Q1 and the transistor Q3 constitute a second current mirror. Specifically, the current input end of the transistor Q1 is coupled with the high-voltage power supply end VHV through the resistor R5, and the current output end of the transistor Q1 is coupled with the reference ground. The current output end of the transistor Q3 is coupled with the reference ground, and the starting module 10 generates a bias signal at the current input end of the transistor Q3. On this basis, the negative feedback loop 21 in the embodiment no longer includes the transistor Q1, and the current output ends of the transistor Q2 and the transistor Q3 in the negative feedback loop 21 are no longer coupled with the control end of the transistor Q1, but are directly coupled with the reference.

[0141] It can be understood that, in the low-voltage power supply generation circuit provided in the embodiment, in the starting stage, the high-voltage power supply signal VHV starts to rise, the current gradually flows through the transistor Q1, and the bias signal (for example, corresponding to the second current I2) is generated at the current input end of the transistor Q3 based on the second current mirror composed of the transistor Q1 and the transistor Q3. The bias signal further causes the current input end of the transistor Q2 to generate the third current I3 based on the first current mirror composed of the transistor Q3 and the transistor Q2, and the potential of the collector of the transistor Q2 is gradually pulled down. When the potential of the collector of the transistor Q2 is pulled down to less than a certain value, the transistor M3 starts to conduct, so that the low-voltage power supply signal generation module 20 is started.

[0142] In the embodiment, the process of the negative feedback loop 21 performing negative feedback includes: in the dynamic adjustment process, adjusting the base current of the transistor Q3 according to the feedback signal Vb, thereby adjusting the second current I2, and adjusting the first current I1 based on the first current mirror; at the same time, adjusting the voltage at the first end of the resistor R2 according to the feedback signal Vb, that is, adjusting the base current of the transistor Q2, thereby adjusting the third current I3, to adjust the control end signal Va based on the change of the first current I1 and the third current I3; adjusting the conduction degree of the transistor M3 according to the control end signal Va, thereby adjusting the low-voltage power supply signal VLV. It can be seen that, when the current on the first current path of the first current mirror is adjusted in the negative feedback process, the control end signal Va can be negatively fed back and adjusted based on the feedback signal Vb, so that the loop can quickly reach a stable state, and the feedback effect is good.

[0143] However, it can be understood that, in the stable state, the feedback signal Vb can be represented by the following formula in the embodiment:

[0144] Vb=V BE (9).

[0145] On this basis, the low-voltage power supply signal VLV can be represented by the following formula:

[0146]

[0147] Therefore, based on the present embodiment, the low-voltage power supply generation circuit can output a smaller low-voltage power supply signal VLV, that is, the lower limit of the output voltage range that can be allowed by the low-voltage power supply generation circuit in the present embodiment is lower than that in the foregoing embodiment.

[0148] Embodiment five

[0149] The low-voltage power supply generation circuit provided in the embodiment is as shown in Figure 6 .

[0150] Specifically, the low-voltage power supply generation circuit in the embodiment is basically the same as that in the above-mentioned embodiment two, and thus will not be described again.

[0151] The difference is that in the embodiment, the starting module 10 and the low-voltage power supply signal generation module 20 adopt a different connection relationship from that in the above-mentioned embodiment two. Specifically, in the embodiment, the types of the transistors in the starting module 10 and the low-voltage power supply signal generation module 20 are also opposite to those in the above-mentioned embodiment two.

[0152] Specifically, in the embodiment, the starting module 10 includes a transistor Q1, a transistor Q2 and a resistor R1. The current input end of the transistor Q1 is coupled with the high-voltage power supply end VHV, and the current output end of the transistor Q1 is coupled with the reference ground through the resistor R1. The control end of the transistor Q2 is coupled with the current output end of the transistor Q1, and the current input end of the transistor Q2 is coupled with the control end of the transistor Q1. The starting module 10 generates a bias signal at the current output end of the transistor Q2.

[0153] The low-voltage power supply signal generation module 20 includes a transistor M3, a feedback unit 22 and a negative feedback loop 21.

[0154] The transistor M3 is coupled between the low-voltage power supply signal output end (hereinafter referred to as the output end) VHV_REG of the low-voltage power supply generation circuit and the reference ground, and the control end of the transistor M3 receives a control end signal Va for adjusting the low-voltage power supply signal VLV according to the control end signal Va. In the embodiment, the low-voltage power supply signal VLV represents the potential difference between the high-voltage power supply end VHV and the low-voltage power supply signal output end VHV_REG, i.e., in the embodiment, VLV = VHV-VHV_REG.

[0155] The feedback unit 22 is coupled between the high-voltage power supply end VHV and the output end VHV_REG of the low-voltage power supply generation circuit, and is used for sampling and feeding back the low-voltage power supply signal VLV and outputting a feedback signal Vb. Specifically, in the embodiment, the feedback unit 22 includes a resistor R3 and a resistor R4. The first end of the resistor R3 is coupled with the output end VHV_REG of the low-voltage power supply generation circuit, and the resistor R4 is coupled between the high-voltage power supply end VHV and the second end of the resistor R3. The feedback unit 22 outputs the feedback signal Vb at the second end of the resistor R3.

[0156] In the embodiment, the negative feedback loop 21 further comprises: transistor Q1, transistor Q2, transistor Q3, transistor M1, transistor M2 and resistor R2. The transistor M1 and the transistor M2 constitute a first current mirror, and the current output ends of the transistor M1 and the transistor M2 are coupled with a reference ground; the current output end of the transistor Q2 is coupled with the current input end of the transistor M1; the current output end of the transistor Q3 is coupled with the current input end of the transistor M2, the current input end of the transistor Q3 is coupled with the control end of the transistor Q1, and the control end of the transistor Q3 receives the feedback signal Vb, that is, the control end of the transistor Q3 is coupled with the second end of the resistor R3; the first end of the resistor R2 is coupled with the control end of the transistor Q2, and the second end of the resistor R2 is coupled with the control end of the transistor Q3.

[0157] In the embodiment, the transistor M1 and the transistor Q2 constitute a first current path in the negative feedback loop 21, and the transistor M2 and the transistor Q3 constitute a second current path in the negative feedback loop 21. The negative feedback loop 21 generates the control end signal Va at the current input end of the transistor M1, and the low-voltage power supply signal generation module 20 generates the positive temperature coefficient voltage across the resistor R2.

[0158] Optionally, the transistor Q1, the transistor Q2, the transistor Q3, the transistor M1, the transistor M2 and the transistor M3 can be selected from at least one of a field effect transistor and a bipolar junction transistor. In the embodiment, only the transistor Q1, the transistor Q2 and the transistor Q3 are taken as PNP transistors, and the transistor M1, the transistor M2 and the transistor M3 are taken as NMOS transistors as an example for illustrative description, and the specific selection can be made according to the cost and accuracy requirements in actual application. It can be understood that for the PNP transistor, the control end corresponds to the base, the current input end corresponds to the emitter, and the current output end corresponds to the collector; for the NMOS transistor, the control end corresponds to the gate, the current input end corresponds to the drain, and the current output end corresponds to the source.

[0159] The low-voltage power supply generation circuit provided in the embodiment has basically the same working principle as the second embodiment, except that the output low-voltage power supply signal is different, which will not be described here.

[0160] Therefore, according to the embodiment, the low-voltage power supply generation circuit can generate the low-voltage power supply signal VLV corresponding to the high-voltage power supply signal VHV.

[0161] Further, the embodiment of the application further provides an integrated circuit, which can be any analog device requiring a low-voltage power supply, such as a charger, a direct current power supply generation device, etc.

[0162] In particular, the integrated circuit comprises at least one low-voltage circuit module and the low-voltage power supply generating circuit in any of the above embodiments. The low-voltage power supply generating circuit is configured to provide the at least one low-voltage circuit module with a low-voltage power supply signal VLH having a driving capability based on the high-voltage power supply signal VHV. Exemplarily, the aforementioned low-voltage circuit module can be, for example, an internal sub-circuit of an integrated circuit such as an amplifier, a comparator, a converter, a digital logic circuit, etc.

[0163] Finally, it should be noted that: obviously, the above embodiments are only examples for clearly illustrating the present application, and are not limitations on the embodiments. Based on the above description, other different forms of changes or variations can also be made by those of ordinary skill in the art. Here, it is not necessary and also impossible to enumerate all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A low-voltage power supply generating circuit, wherein, include: The startup module is used to generate a bias signal based on the high-voltage power supply signal. A low-voltage power signal generation module includes a connected transistor element and a resistor element. The module is activated based on a bias signal and, upon activation, outputs a low-voltage power signal with driving capability at the common node of the resistor element and the transistor element. This low-voltage power signal is weaker than the high-voltage power signal. The low-voltage power signal generation module includes a negative feedback loop, which performs negative feedback control on the low-voltage power signal based on the feedback signal at the output terminal. The startup module and the negative feedback loop share at least one component.

2. The low-voltage power supply generating circuit according to claim 1, wherein, The low-voltage power signal generation module generates a positive temperature coefficient voltage and outputs the low-voltage power signal based on the positive temperature coefficient voltage and the feedback signal.

3. The low-voltage power generation circuit according to claim 1, wherein, The low-voltage power signal generation module includes a negative feedback loop. The negative feedback loop includes a first current path and a second current path that constitute the first current mirror. The negative feedback loop generates a control signal for the transistor element based on a first current and a third current on the first current path, where the first current and the third current represent different portions of the current on the first current path. The negative feedback loop is configured to adjust the second current on the second current path and the first current and the third current on the first current path according to the feedback signal.

4. The low-voltage power supply generating circuit according to claim 3, wherein, The transistor element is coupled between the high-voltage power supply terminal and the output terminal of the low-voltage power generation circuit, and is used to adjust the low-voltage power supply signal according to the control terminal signal. The first end of the resistor element is coupled to the low-voltage power supply signal output end, and is used to provide feedback to the low-voltage power supply signal and output the feedback signal at the second end.

5. The low-voltage power generation circuit according to claim 3, wherein, The transistor element is coupled between the output terminal of the low-voltage power generation circuit and the reference ground, and is used to adjust the low-voltage power signal according to the control terminal signal. The low-voltage power signal represents the potential difference between the high-voltage power terminal and the output terminal of the low-voltage power generation circuit. The resistive element and the third resistor are connected in series between the low-voltage power supply signal output terminal and the high-voltage power supply terminal, for feeding back the low-voltage power supply signal and outputting the feedback signal at the connection node of the resistive element and the third resistor.

6. The low-voltage power generation circuit according to claim 4, wherein, The startup module includes: The first transistor and the third transistor constitute the second current mirror. The current input terminal of the first transistor is coupled to the high-voltage power supply terminal through a first resistor, and the current output terminal of the first transistor is coupled to a reference ground. The current output terminal of the third transistor is also coupled to a reference ground. The startup module generates the bias signal at the current input terminal of the third transistor.

7. The low-voltage power generation circuit according to claim 6, wherein, The negative feedback loop includes: The fourth and fifth transistors constituting the first current mirror are coupled to the high-voltage power supply terminal at their current input terminals. The second transistor has its current input terminal coupled to the current output terminal of the fourth transistor, and the current output terminal of the second transistor is coupled to a reference ground. The third transistor has its current input terminal coupled to the current output terminal of the fifth transistor, and its control terminal receives the feedback signal. The second resistor has its first end coupled to the control terminal of the second transistor and its second end coupled to the control terminal of the third transistor. Wherein, the fourth transistor and the second transistor form the first current path in the negative feedback loop, the fifth transistor and the third transistor form the second current path in the negative feedback loop, and the first current represents the current flowing through the fourth transistor, and the third current represents the current flowing through the second transistor; The negative feedback loop generates the control signal at the current output terminal of the fourth transistor, and the low-voltage power supply signal generation module generates a positive temperature coefficient voltage across the second resistor in a stable state.

8. The low-voltage power supply generating circuit according to claim 4, wherein, The startup module includes: The first transistor has its current input terminal coupled to the high-voltage power supply terminal through a first resistor, and its current output terminal coupled to the reference ground. The control terminal of the second transistor is coupled to the current input terminal of the first transistor, and the current output terminal of the second transistor is coupled to the control terminal of the first transistor. The startup module generates the bias signal at the current input terminal of the second transistor.

9. The low-voltage power supply generating circuit according to claim 8, wherein, The negative feedback loop includes: The fourth and fifth transistors constituting the first current mirror are coupled to the high-voltage power supply terminal at their current input terminals. The first transistor; The second transistor has its current input terminal coupled to the current output terminal of the fourth transistor. The third transistor has its current input terminal coupled to the current output terminal of the fifth transistor, and its current output terminal coupled to the control terminal of the first transistor. The control terminal of the third transistor receives the feedback signal. The second resistor has its first end coupled to the control terminal of the second transistor and its second end coupled to the control terminal of the third transistor. Wherein, the fourth transistor and the second transistor form the first current path in the negative feedback loop, the fifth transistor and the third transistor form the second current path in the negative feedback loop, and the first current represents the current flowing through the fourth transistor, and the third current represents the current flowing through the second transistor; The negative feedback loop generates the control signal at the current output terminal of the fourth transistor, and the low-voltage power supply signal generation module generates a positive temperature coefficient voltage across the second resistor.

10. The low-voltage power generation circuit according to claim 9, wherein, The low-voltage power signal generation module further includes: The fifth resistor is coupled between the control terminal of the first transistor and the reference ground.

11. The low-voltage power generation circuit according to claim 10, wherein, The negative feedback loop also includes: A fourth resistor is coupled between the second terminal of the resistive element and a reference ground.

12. The low-voltage power generation circuit according to claim 7 or 9, wherein, At least one of the second transistor, the third transistor, the fourth transistor, and the fifth transistor is configured to consist of a plurality of transistors of the same specification connected in parallel. The ratio of the number of transistors connected in parallel with the second transistor and the third transistor is N1, and the ratio of the number of transistors connected in parallel with the fourth transistor and the fifth transistor is N2, wherein N1 and N2 are both positive numbers, and the product of N1 and N2 is a preset fixed value.

13. The low-voltage power supply generating circuit according to claim 5, wherein, The startup module includes: The first transistor has its current input terminal coupled to the high-voltage power supply terminal, and its current output terminal coupled to the reference ground through the first resistor. The control terminal of the second transistor is coupled to the current output terminal of the first transistor, and the current input terminal of the second transistor is coupled to the control terminal of the first transistor. The startup module generates the bias signal at the current output terminal of the second transistor.

14. The low-voltage power supply generating circuit according to claim 13, wherein, The negative feedback loop includes: The fourth and fifth transistors constituting the first current mirror are coupled to a reference ground at their current output terminals. The first transistor; The second transistor has its current output terminal coupled to the current input terminal of the fourth transistor. The third transistor has its current input terminal coupled to the control terminal of the first transistor, and its current output terminal coupled to the current input terminal of the fifth transistor. The control terminal of the third transistor receives the feedback signal. The second resistor has its first end coupled to the control terminal of the second transistor and its second end coupled to the control terminal of the third transistor. Wherein, the fourth transistor and the second transistor form the first current path in the negative feedback loop, the fifth transistor and the third transistor form the second current path in the negative feedback loop, and the first current represents the current flowing through the fourth transistor, and the third current represents the current flowing through the second transistor; The negative feedback loop generates the control signal at the current input terminal of the fourth transistor, and the low-voltage power supply signal generation module generates a positive temperature coefficient voltage across the second resistor.

15. An integrated circuit, wherein, include: At least one low-voltage circuit module; The low-voltage power generation circuit according to any one of claims 1-14 is used to provide a low-voltage power signal with driving capability to at least one of the low-voltage circuit modules according to a high-voltage power signal.

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