Ramp wave signal superposition device, switching power supply voltage stabilizer and electronic equipment

Abstract

The utility model provides a ramp signal superposition device, a switching power supply voltage stabilizer and electronic equipment. The device comprises a reference voltage follower circuit, a ramp voltage superposition circuit and a superposition signal output circuit, the first end of the reference voltage follower circuit is used for receiving reference voltage, the second end of the ramp voltage superposition circuit is used for receiving ramp current, and the third end of the superposition signal output circuit outputs a target electric signal. The reference voltage follower circuit is maintained at a reference voltage; the ramp signal superposition device is configured to charge the superposed signal output circuit when the ramp current is in a rising stage, so that the target electric signal is in a rising state; and when the oblique wave current is in a descending stage, the superposed signal output circuit is discharged, so that the target electric signal is in a descending state. The oblique wave signal superposition device provided by the utility model has the advantages of strong anti-noise capability, small area and the like, and can provide oblique wave superposition signals with better stability.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to a ramp signal superposition device, a switching power supply regulator, and electronic equipment. Background Technology

[0002] Switching power supply regulators have advantages such as high efficiency, small size, and light weight, and are widely used in various applications requiring stable voltage. For example... Figure 1 As shown, it schematically illustrates one circuit topology of a switching power supply regulator in related technologies. From Figure 1 It can be seen that the equivalent series resistance (ESR) R ESR A crucial factor affecting the stability of switching power supply regulators: Capacitor C out Equivalent series resistance R ESR The smaller the resistance value, the worse the stability of the switching power supply regulator. out Equivalent series resistance R ESR The higher the resistance value, the better the stability of the switching power supply regulator. However, during steady-state operation, a larger equivalent series resistance R... ESR This often leads to a significant increase in output voltage ripple, and unavoidably large overshoot and undershoot voltages occur when the load transient response changes. In addition, due to its inherently large output voltage ripple, traditional ripple-controlled switching power supply regulators (such as DC / DC converters) are not suitable for power supply circuits that supply sensitive analog circuits.

[0003] To solve the above problems, such as Figure 1 As shown, this problem is usually solved by using an additional ramp signal. However, research has found that adding a ramp voltage V... RAMP and reference voltage V RAMP Directly superimposed as an additional ramp signal V CMP The implementation method has drawbacks such as low anti-interference ability and poor stability.

[0004] It should be noted that the information disclosed in the background section of this utility model is intended only to enhance the understanding of the general background of this utility model, and should not be regarded as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a ramp signal superposition device, a switching power supply regulator, and an electronic device. The ramp signal superposition device provided by this invention has the advantages of strong anti-noise capability and small area, and can provide a ramp superposition signal with good stability. Furthermore, the circuit structure of the ramp signal superposition device provided by this invention is simple and easy to implement.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a ramp signal superposition device, the ramp signal superposition device comprising: a reference voltage follower circuit, a ramp voltage superposition circuit, and a superposition signal output circuit;

[0007] The first terminal of the reference voltage follower circuit is used to receive a reference voltage. The second terminal of the reference voltage follower circuit, the first terminal of the ramp voltage superposition circuit, and the first terminal of the superposition signal output circuit are coupled to a first node. The second terminal of the ramp voltage superposition circuit is used to receive a ramp current. The third terminal of the ramp voltage superposition circuit and the second terminal of the superposition signal output circuit are coupled to a second node. The third terminal of the superposition signal output circuit outputs a target electrical signal. The third terminal of the reference voltage follower circuit and the fourth terminal of the ramp voltage superposition circuit receive the supply voltage. The fifth terminal of the ramp voltage superposition circuit and the fourth terminal of the superposition signal output circuit are coupled to a third node. The fourth terminal of the reference voltage follower circuit and the third node are coupled to a reference ground.

[0008] The reference voltage follower circuit is configured to maintain the voltage at the first node at the reference voltage; the ramp voltage superposition circuit is configured to charge the superposition signal output circuit through the second node when the ramp current is in the rising phase, so that the target electrical signal of the superposition signal output circuit is in the rising state; when the ramp current is in the falling phase, the superposition signal output circuit discharges through the third node, so that the target electrical signal of the superposition signal output circuit is in the falling state.

[0009] Optionally, the reference voltage follower circuit includes a first operational amplifier, a first MOSFET, and a negative feedback resistor unit; the non-inverting input of the first operational amplifier is used to receive the reference voltage, the inverting input of the first operational amplifier, the first terminal of the first MOSFET, and the first terminal of the negative feedback resistor unit are coupled to the first node, the output of the first operational amplifier is coupled to the control terminal of the first MOSFET, the second terminal of the first MOSFET receives the supply voltage, and the second terminal of the negative feedback resistor unit is coupled to the reference ground.

[0010] Optionally, the ramp voltage superposition circuit includes a superposition switching unit and a signal superposition unit. The first end of the superposition switching unit is coupled to the first node, the second end of the superposition switching unit is coupled to the second node, the third end of the superposition switching unit and the first end of the signal superposition unit are coupled to the fourth node, the second end of the signal superposition unit is used to receive the ramp current, the third end of the signal superposition unit receives the supply voltage, and the fourth end of the signal superposition unit is coupled to the third node.

[0011] The superposition switching unit is configured to control the signal superposition unit to be connected to the second node when the ramp current is in the rising phase, and to control the signal superposition unit to be disconnected from the second node when the ramp current is in the falling phase.

[0012] Optionally, the superposition switching unit includes a second operational amplifier, a second MOS transistor, and a third MOS transistor. The positive input terminal of the second operational amplifier is coupled to the first node, the first terminal of the second MOS transistor is coupled to the second node, the second terminal of the second MOS transistor and the first terminal of the third MOS transistor are coupled to the fourth node, and the inverting input terminal of the second operational amplifier, the output terminal of the second operational amplifier, and the second terminal of the third MOS transistor are coupled together.

[0013] The control terminals of the second MOSFET and the third MOSFET are configured to receive a pair of inverse logic control signals, such that the second MOSFET is turned on and the third MOSFET is turned off when the ramp current is in the rising phase, and the second MOSFET is turned off and the third MOSFET is turned on when the ramp current is in the falling phase.

[0014] Optionally, the signal superposition unit includes a receiving device for receiving the ramp current and a constant current source. The first end of the receiving device receives the supply voltage, the second end of the receiving device and the first end of the constant current source are coupled to the fourth node, and the second end of the constant current source is coupled to the third node.

[0015] Optionally, the constant current source includes a common-source cascode current mirror.

[0016] Optionally, the superimposed signal output circuit includes an RC equivalent circuit.

[0017] Optionally, the RC equivalent circuit includes a voltage divider resistor unit and a fourth MOS transistor. The first end of the voltage divider resistor unit is coupled to the first node, the second end of the voltage divider resistor unit is coupled to the second node, and the common connection point of the third end of the voltage divider resistor unit and the control end of the fourth MOS transistor is used to output the target electrical signal. The first and second ends of the fourth MOS transistor are coupled to the third node.

[0018] To achieve the above objectives, the present invention also provides a switching power supply regulator, which includes the ramp signal superposition device described in any of the above claims.

[0019] To achieve the above objectives, the present invention also provides an electronic device, which includes the ramp signal superposition device described in any of the above claims or the switching power supply regulator described in any of the above claims.

[0020] Compared with the prior art, the ramp signal superposition device, switching power supply regulator, and electronic equipment provided by this utility model have the following advantages:

[0021] The ramp signal superposition device provided by this utility model includes a reference voltage follower circuit, which not only ensures that the voltage at the first node is the same as the reference voltage and amplifies the voltage signal to improve driving capability, but also operates stably over a wide temperature range and power supply fluctuation range, exhibiting good stability and reliability. Furthermore, the ramp signal superposition device includes a ramp voltage superposition circuit, which charges the superposition signal output circuit through the second node when the ramp current is in the rising phase, and discharges the superposition signal output circuit through the third node when the ramp current is in the falling phase. Thus, it not only effectively follows the rising and falling states of the ramp current, but also effectively suppresses noise and improves the circuit's anti-interference capability. Even further, the ramp signal superposition device includes a superposition signal output circuit, which outputs a target electrical signal with good stability, and the target electrical signal rises / falls synchronously with the rising / falling states of the ramp current. In summary, this utility model has the advantages of strong anti-noise capability and small area, and can provide a stable ramp superposition signal. Furthermore, the ramp signal superposition device provided by this utility model has a simple circuit structure and is easy to implement.

[0022] Since the switching power supply regulator and electronic equipment provided by this utility model belong to the same inventive concept as the ramp signal superposition device provided by this utility model, the switching power supply regulator and electronic equipment provided by this utility model have at least all the advantages of the ramp signal superposition device provided by this utility model. For details on the beneficial effects of the switching power supply regulator and electronic equipment provided by this utility model, please refer to the above description of the beneficial effects of the ramp signal superposition device provided by this utility model, which will not be repeated here. Attached Figure Description

[0023] Figure 1This is a schematic diagram of one of the circuit topologies of a switching power supply regulator in related technologies.

[0024] Figure 2 This is a block diagram of the oblique wave signal superposition device provided in Embodiment 1 of this utility model;

[0025] Figure 3 A schematic diagram of the circuit topology of a specific example of the ramp signal superposition device provided in Embodiment 1 of this utility model;

[0026] Figure 4 To adopt Figure 3 A schematic diagram of the key node waveforms of the ramp signal superposition device shown;

[0027] The accompanying figure is labeled as follows:

[0028] Capacitor-C out Equivalent series resistance -R ESR ramp voltage -V RAMP Reference voltage -V REF Slope current -I RAMP Supply voltage - VDD, constant current - I CONST First voltage -V1, second voltage -V2;

[0029] Reference voltage follower circuit-100, first operational amplifier-110, first MOSFET-M1, negative feedback resistor unit-120, first resistor-R1, second resistor-R2;

[0030] Slope voltage superposition circuit-200, superposition switching unit-210, second operational amplifier-211, second MOSFET-M2, third MOSFET-M3, signal superposition unit-220, receiving device-221, constant current source-222;

[0031] Superimposed signal output circuit -300, voltage divider resistor unit -310, third resistor -R3, fourth resistor -R4, fourth MOSFET -M4;

[0032] First node - N1, second node - N2, third node - N3, fourth node - N4, reference ground - GND. Detailed Implementation

[0033] The following detailed description, in conjunction with the accompanying drawings, provides a further detailed account of the ramp signal superposition device, switching power supply regulator, and electronic equipment proposed in this utility model. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, intended only to facilitate and clearly illustrate the purpose of the embodiments of this utility model. Please refer to the drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for illustrative purposes and to enable those skilled in the art to understand and read them, and are not intended to limit the implementation conditions of this utility model. Any modifications to the structure, changes in proportions, or adjustments to the size, provided they produce the same or similar effects and achieve the same purpose as this utility model, should still fall within the scope of the technical content disclosed in this utility model. Specific design features of this utility model disclosed herein, including, for example, specific dimensions, orientations, positions, and shapes, will be determined in part by the specific application and usage environment. Furthermore, in the embodiments described below, the same reference numerals are sometimes used across different figures to denote the same parts or parts having the same function, omitting repeated descriptions. In this specification, similar reference numerals and letters are used to denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures. Additionally, if the methods described herein comprise a series of steps, and the order of these steps presented herein is not necessarily the only possible order in which these steps can be performed, some described steps may be omitted and / or other steps not described herein may be added to the method.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The singular forms “a,” “an,” and “the” include plural objects. The term “or” is generally used to mean “and / or,” the term “several” is generally used to mean “at least one,” and the term “at least two” is generally used to mean “two or more.” Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0035] It should be understood that when a component is referred to as "connected," "connected to," or "coupled to" other components, it may be directly connected to other components, or there may be intermediary components. Conversely, when a component is referred to as "directly connected" or "directly connected to" other components, there are no intermediary components.

[0036] The core idea of ​​this utility model is to provide a ramp signal superposition device, a switching power supply regulator, and an electronic device. The ramp signal superposition device provided by this utility model has the advantages of strong anti-noise capability and small area, and can provide a ramp superposition signal with good stability. Furthermore, the circuit structure of the ramp signal superposition device provided by this utility model is simple and easy to implement.

[0037] It should be noted that the ramp signal superposition device provided by this utility model can be applied to the switching power supply regulator and electronic equipment provided by this utility model.

[0038] Example 1

[0039] To achieve the above-mentioned goal, this embodiment provides a slope wave signal superposition device. For example, please refer to... Figure 2 , Figure 2 This is a block diagram of the oblique wave signal superposition device provided in this embodiment. Figure 2As shown, the ramp signal superposition device provided in this embodiment includes: a reference voltage follower circuit 100, a ramp voltage superposition circuit 200, and a superposition signal output circuit 300. The first terminal of the reference voltage follower circuit 100 is used to receive a reference voltage V. REF The second terminal of the reference voltage follower circuit 100, the first terminal of the ramp voltage superposition circuit 200, and the first terminal of the superposition signal output circuit 300 are coupled to the first node N1. The second terminal of the ramp voltage superposition circuit 200 is used to receive the ramp current I. RAMP The third terminal of the ramp voltage superposition circuit 200 and the second terminal of the superposition signal output circuit 300 are coupled to the second node N2, and the third terminal of the superposition signal output circuit 300 outputs the target electrical signal ( Figure 2 China and Israel R REF +V RAMP (Illustrative image); the third terminal of the reference voltage follower circuit 100 and the fourth terminal of the ramp voltage superposition circuit 200 receive the supply voltage VDD; the fifth terminal of the ramp voltage superposition circuit 200 and the fourth terminal of the superposition signal output circuit 300 are coupled to the third node N3; and the fourth terminal of the reference voltage follower circuit 100 and the third node N3 are coupled to the reference ground GND. Further, the reference voltage follower circuit 100 is configured to maintain the voltage at the first node N1 at the reference voltage VDD. REF The ramp voltage superposition circuit 200 is configured to, when the ramp current I... RAMP During the rising phase, the superimposed signal output circuit 300 is charged through the second node N2, so that the target electrical signal of the superimposed signal output circuit 300 is in a rising state; when the ramp current I RAMP During the descent phase, the superimposed signal output circuit 300 discharges through the third node N3, so that the target electrical signal of the superimposed signal output circuit 300 is in a descent state.

[0040] Therefore, the ramp signal superposition device provided by this utility model includes a reference voltage follower circuit 100, which can not only ensure the voltage at the first node N1 and the reference voltage V REF Similarly, it amplifies the voltage signal to improve its driving capability, and can also operate stably over a wide temperature range and power supply fluctuation range, exhibiting good stability and reliability; furthermore, the ramp signal superposition device provided by this utility model includes a ramp voltage superposition circuit 200, and the ramp voltage superposition circuit 200 can, in the case of the ramp current I RAMP During the rising phase, the superimposed signal output circuit 300 is charged through the second node N2, and the ramp current I... RAMPDuring the descent phase, the superimposed signal output circuit 300 is discharged through the third node N3, thereby enabling it to accurately follow the ramp current I. RAMP The device can effectively suppress noise and improve the circuit's anti-interference capability, while also controlling the rise and fall of the signal. Furthermore, the ramp signal superposition device provided by this invention includes the superposition signal output circuit 300, which can output a target electrical signal with good stability. Figure 2 China and Israel R REF +V RAMP (Illustrative diagram), and the target electrical signal can follow the ramp current I. RAMP The rising / falling states are synchronized. In summary, this invention has advantages such as strong noise resistance and small area, and can provide a stable ramp signal. Furthermore, the ramp signal superposition device provided by this invention has a simple circuit structure and is easy to implement.

[0041] It should be noted that those skilled in the art should understand that this utility model addresses the reference voltage V. REF The power supply voltage VDD and the ramp current I RAMP The specific value of V is not limited. In the specific implementation of this utility model, the reference voltage V should be reasonably set according to actual needs. REF The power supply voltage VDD and the ramp current I RAMP The specific value of the reference voltage V. Furthermore, this invention provides for the specific value of the reference voltage V. REF and the ramp current I RAMP The method of supply is not limited in much detail, based on the reference voltage V. REF For example, the reference voltage V REF It can be a bandgap-based reference voltage generated using an operational amplifier or the like, wherein the reference voltage V REF The reference voltage V can also be obtained through voltage division. REF It can also be obtained through a reference current transformation. For example, the ramp current I... RAMP The output voltage (e.g., of a device (such as a switching power supply regulator) equipped with the ramp signal superposition device provided by this utility model can be used to determine the output voltage of the device (such as a device with a ramp signal superposition device provided by this utility model). Figure 1 Chinese V out ) or feedback sampling voltage (e.g. Figure 1 Chinese V FB (Identified.) Furthermore, this utility model does not impose excessive limitations on the target electrical signal. For example, in some embodiments, the target electrical signal can be a voltage signal, and in other embodiments, the target electrical signal can be a current signal.

[0042] Preferably, in some exemplary embodiments, please refer to Figure 3 ,from Figure 3 As can be seen, the reference voltage follower circuit 100 includes a first operational amplifier 110, a first MOSFET M1, and a negative feedback resistor unit 120; the non-inverting input of the first operational amplifier 110 is used to receive the reference voltage V. REF The inverting input terminal of the first operational amplifier 110, the first terminal of the first MOSFET M1, and the first terminal of the negative feedback resistor unit 120 are coupled to the first node N1. The output terminal of the first operational amplifier 110 is coupled to the control terminal of the first MOSFET M1. The second terminal of the first MOSFET M1 receives the supply voltage VDD, and the second terminal of the negative feedback resistor unit 120 is coupled to the reference ground GND. Thus, the first operational amplifier 110, as an input stage, can convert the reference voltage VDD into a voltage that is inverting the input voltage VDD. REF The amplification is adjusted to a suitable amplitude; the first MOS transistor M1 serves as the output stage, enhancing the output current capability and reducing the output resistance; the negative feedback resistor unit 120 limits the amplification factor and corrects the output voltage, thereby effectively ensuring the first voltage V1 at the output terminal (at the first node N1) and the reference voltage V. REF same.

[0043] It should be noted that those skilled in the art should understand that the present invention does not impose excessive limitations on the specific implementation of the first operational amplifier 110. For example, the first operational amplifier 110 can be, but is not limited to, a differential amplifier, a common-emitter amplifier, and a common-base amplifier. Furthermore, although... Figure 3 The example uses the first MOS transistor M1 as a PMOS transistor, but this is clearly not a limitation of the present invention. The present invention does not impose excessive limitations on the first MOS transistor M1; it can be either a PMOS transistor or an NMOS transistor. In other embodiments, the first MOS transistor M1 can also be implemented in other ways besides PMOS and NMOS transistors, such as a transistor. Figure 3 As shown, if a PMOS transistor is used to implement the first MOS transistor M1, the gate of the PMOS transistor is coupled to the output terminal of the first operational amplifier 110, the source of the PMOS transistor is coupled to the first node N1, and the drain of the PMOS transistor is used to receive the supply voltage VDD.

[0044] For example, in some of the exemplary embodiments, please continue to refer to Figure 3 ,like Figure 3As shown, the negative feedback resistor unit 120 includes a first resistor R1 and a second resistor R2 connected in series. Therefore, the negative feedback resistor unit 120, by adopting the design of the first resistor R1 and the second resistor R2 connected in series, can effectively guarantee the first voltage V1 at the output terminal (at the first node N1) and the reference voltage V. REF It is similar to the previous one, and has the advantages of high reliability and low cost. Furthermore, the resistance ratio of the first resistor R1 and the second resistor R2 can be reasonably set as needed, so that the common contact point between the first resistor R1 and the second resistor R2 can provide a stable output voltage division, thereby making the ramp signal superposition device provided by this utility model more applicable and further reducing the cost of equipment (such as switching power supply regulators) using the ramp signal superposition device provided by this utility model.

[0045] Preferably, in some exemplary embodiments, please continue to refer to Figure 3 ,from Figure 3 As can be seen, the ramp voltage superposition circuit 200 includes a superposition switching unit 210 and a signal superposition unit 220. The first end of the superposition switching unit 210 is coupled to the first node N1, the second end of the superposition switching unit 210 is coupled to the second node N2, and the third end of the superposition switching unit 210 and the first end of the signal superposition unit 220 are coupled to the fourth node N4. The second end of the signal superposition unit 220 is used to receive the ramp current I. RAMP The third terminal of the signal superposition unit 220 receives the supply voltage VDD, and the fourth terminal of the signal superposition unit 220 is coupled to the third node N3. Further, the superposition switching unit 210 is configured to switch when the ramp current I... RAMP During the rising phase, the signal superposition unit 220 is controlled to be turned on with the second node N2; when the ramp current I RAMP During the descent phase, the signal superposition unit 220 is disconnected from the second node N2.

[0046] Therefore, the ramp signal superposition device provided in this embodiment includes a superposition switching unit 210 and a signal superposition unit 220. The superposition switching unit 210 can effectively adjust the signal according to the ramp current I. RAMP The rising and falling states control the connection (either on or off) between the signal superposition unit 220 and the second node N2, thereby changing the charging and discharging state of the superimposed signal output circuit 300 through the signal superposition unit 220, thus effectively realizing the ramp current I. RAMP and the reference voltage V REF Effective superposition and output of the stable target electrical signal ( Figure 3 China and Israel RREF +V RAMP (Illustration)

[0047] For example, in some of the exemplary embodiments, please continue to refer to Figure 3 ,like Figure 3 As shown, the superposition switching unit 210 includes a second operational amplifier 211, a second MOSFET (i.e., the upper MOSFET) M2, and a third MOSFET (i.e., the lower MOSFET) M3. The positive input terminal of the second operational amplifier 211 is coupled to the first node N1, the first terminal of the second MOSFET M2 is coupled to the second node N2, the second terminal of the second MOSFET M2 and the first terminal of the third MOSFET M3 are coupled to the fourth node N4, and the inverting input terminal, the output terminal of the second operational amplifier 211, and the second terminal of the third MOSFET M3 are coupled. Further, the control terminals of the second MOSFET M2 and the third MOSFET M3 are configured to receive a pair of mutually inverse logic control signals (…). Figure 3 In the diagram, the control signal applied to the control terminal of the second MOSFET M2 is indicated by HS_ON, and the control signal applied to the control terminal of the third MOSFET M3 is indicated by HS_ON_B, so that the ramp current I... RAMP During the rising phase, the second MOSFET M2 is turned on and the third MOSFET M3 is turned off, in the ramp current I RAMP During the descent phase, the second MOS transistor M2 is turned off and the third MOS transistor M3 is turned on.

[0048] Therefore, the design of the superposition switching unit 210 using the second operational amplifier 211, the second MOS transistor M2, and the third MOS transistor M3 not only effectively ensures the stability and reliability of the ramp signal superposition device provided by this utility model, but also has a simple circuit structure and is easy to implement.

[0049] It should be noted that those skilled in the art should understand that Figure 3 The design of the superposition switching unit 210 using the second operational amplifier 211, the second MOS transistor M2, and the third MOS transistor M3 is merely an illustrative example of a preferred embodiment and not a limitation of this invention. For instance, in other embodiments, other devices may be used to implement the superposition switching unit 210. Furthermore, although... Figure 3The example given uses PMOS transistors as both the second MOS transistor M2 and the third MOS transistor M3. However, this is clearly not a limitation of the present invention. The present invention does not impose excessive limitations on the second MOS transistor M2 and the third MOS transistor M3. The second MOS transistor M2 and the third MOS transistor M3 can be either PMOS transistors or NMOS transistors. In other embodiments, the second MOS transistor M2 and the third MOS transistor M3 can also be implemented using other methods besides PMOS transistors and NMOS transistors, such as transistors. Furthermore, as... Figure 3 As shown, if a PMOS transistor is used to implement the second MOS transistor M2 and the third MOS transistor M3, the gate of the second PMOS transistor M2 is used to receive one of the control signals of the pair of opposite logic control signals. Figure 3 (Illustrated by HS_ON) The gate of the third PMOS transistor is used to receive the other control signal of the pair of opposite logic control signals. Figure 3 (Illustrated by HS_ON_B) The source of the second MOS transistor M2 is coupled to the second node N2, the drain of the second MOS transistor M2 and the drain of the third MOS transistor M3 are coupled to the fourth node N4, and the source of the third MOS transistor M3, the inverting input terminal of the second operational amplifier 211 and the output terminal of the second operational amplifier 211 are coupled.

[0050] For example, in some of the exemplary embodiments, please continue to refer to Figure 3 ,like Figure 3 As shown, the signal superposition unit 220 includes a function for receiving the ramp current I. RAMP The receiver 221 and the constant current source 222 are connected. The first terminal of the receiver 221 receives the supply voltage VDD. The second terminal of the receiver 221 and the first terminal of the constant current source 222 are coupled to the fourth node N4, and the second terminal of the constant current source 222 is coupled to the third node N3. Thus, the ramp current I... RAMP The receiving device 221 and the constant current source 222 can not only effectively realize the ramp current I RAMP and the reference voltage V REF The superposition of signals can further improve the stability and reliability of the ramp signal superposition device provided by this utility model. At the same time, the circuit structure is simple and easy to implement.

[0051] For example, the constant current source 222 includes a common-source cascode current mirror. Therefore, the design of the constant current source 222 using a common-source cascode current mirror can effectively reduce the voltage drop in the circuit, thereby further improving the stability and accuracy of the ramp signal superposition device provided by this invention. It should be understood that the implementation of the constant current source 222 using a common-source cascode current mirror described herein is merely an illustrative example of a preferred embodiment and not a limitation. In specific implementations of this invention, the specific implementation of the constant current source 222 should be reasonably selected according to actual needs. For more detailed information on the constant current source 222, please refer to relevant content on constant current source technology known to those skilled in the art; due to space limitations, this will not be elaborated upon herein.

[0052] It should be understood that this utility model refers to the receiving of the ramp current I. RAMP The receiving device 221 is not limited in many ways; in some preferred embodiments, it may be used to receive the ramp current I. RAMP The connection node; in some other preferred embodiments, it may also be used to generate the ramp current I. RAMP The ramp wave generation circuit.

[0053] Preferably, in some exemplary embodiments, the superimposed signal output circuit 300 includes an RC equivalent circuit. Therefore, the design of implementing the superimposed signal output circuit 300 using an RC equivalent circuit not only further improves the stability and reliability of the ramp signal superimposed device provided by this invention, but also has a simple circuit structure and is easy to implement.

[0054] For example, please continue to see Figure 3 ,like Figure 3 As shown, the RC equivalent circuit includes a voltage divider resistor unit 310 and a fourth MOSFET M4. The first terminal of the voltage divider resistor unit 310 is coupled to the first node N1, the second terminal of the voltage divider resistor unit 310 is coupled to the second node N2, and the common connection point of the third terminal of the voltage divider resistor unit 310 and the control terminal of the fourth MOSFET M4 is used to output the target electrical signal. Figure 3 China and Israel R REF +V RAMP (Illustrative diagram), the first and second terminals of the fourth MOS transistor M4 are coupled to the third node N3. Therefore, the design of the superimposed signal output circuit 300 using the voltage divider resistor unit 310 and the fourth MOS transistor M4 not only further improves the circuit efficiency and stability of the ramp signal superimposed device provided by this invention, but also has a simple circuit structure and is easy to implement.

[0055] For example, such as Figure 3As shown, in some exemplary examples, the voltage divider resistor unit 310 includes a third resistor R3 and a fourth resistor R4 connected in series. The first end of the third resistor R3 is coupled to the first node N1, the first ends of the third resistor R3 and the first ends of the fourth resistor R4 are coupled to the second node N2, and the second end of the fourth resistor R4 is coupled to the first end of the fourth MOSFET M4. Therefore, the superimposed signal output circuit 300, using the design of the third resistor R3 and the fourth MOSFET, has the advantages of strong noise immunity, small circuit area, and good stability.

[0056] Furthermore, although Figure 3 The example given is a PMOS transistor, but this is obviously not a limitation of the present invention. The present invention does not impose too many limitations on the fourth MOS transistor M4. The fourth MOS transistor M4 can be a PMOS transistor or an NMOS transistor. In some other embodiments, the fourth MOS transistor M4 can also be implemented in other ways besides PMOS transistors and NMOS transistors, such as a transistor.

[0057] To better understand this utility model, the following is combined with... Figure 3 and Figure 4 The working principle of the ramp signal superposition device provided by this utility model is summarized and explained. Figure 4 To adopt Figure 3 The diagram shows the key node waveforms of the ramp signal superposition device. From... Figure 3 and Figure 4 It can be seen that the first operational amplifier 110 is connected using a negative feedback method, and its output terminal is coupled to the first resistor R1, the third resistor R3, and the non-inverting input terminal of the second operational amplifier 211 to the first node N1; the second operational amplifier 211 is also connected using a negative feedback method. Therefore, the second voltage V2 and the reference voltage V2 output by the second operational amplifier 211 are... REF They are equal. Furthermore, the current from the constant current source 222 is constant, while the ramp current I... RAMP It is not constant; it is a ramp (RAMP) waveform. HS_ON is the in-phase signal controlling the switching of the second MOSFET M2 and the third MOSFET M3, and HS_ON_B is the inverted signal of HS_ON. For example... Figure 4 As shown, when HS_ON=1, the second MOSFET (upper MOSFET) M2 is turned on, corresponding to the ramp current I. RAMP During the rising phase, the ramp current I RAMP and constant current I CONSTThe differential current ΔI flows through the conduction of the second MOSFET M2 to the common junction (i.e., the second node N2 in this paper) between the third resistor R3 and the fourth resistor R4, charging the fourth MOSFET M4; at the same time, the DC voltage of the fourth MOSFET M4 is fixed at the reference voltage V by the first voltage V1 output by the first operational amplifier 110. REF At this time, the target electrical signal output from the third terminal of the superimposed signal output circuit 300 is ( Figure 3 China and Israel R REF +V RAMP The voltage of the signal (illustrated) is raised. Then, the control information HS_ON=0 applied to the gate of the second MOS transistor M2, and the control signal HS_ON_B applied to the gate of the third MOS transistor M3 is 1. The DC voltage at the common junction (i.e., the fourth node N4 in this text) between the constant current source 222 and the receiving device 221 is fixed to the second voltage V2 through the conduction of the third MOS transistor M3. Since the second voltage V2 is equal to the first voltage V1, the fourth MOS transistor M4 leaks through the substrate, causing the target electrical signal ( ) output from the third terminal of the superimposed signal output circuit 300 to be... Figure 3 China and Israel R REF +V RAMP (Illustrated) The voltage drops; simultaneously, the first voltage V1 stabilizes at the reference voltage V. REF Therefore, at the end of one working cycle, the corresponding target electrical signal can be obtained at the third terminal of the superimposed signal output circuit 300.

[0058] Furthermore, the ramp signal superposition device provided by this utility model can be integrated into a chip, thereby further saving the volume occupied by the ramp signal superposition device, improving its reliability, and reducing production costs. It should be understood that when the ramp signal superposition device provided by this utility model is integrated into a chip, this utility model does not limit the chip's manufacturing process, application field, or function. For example, the chip can be, but is not limited to, a 7nm chip, a 14nm chip, and a 28nm chip; the chip can be, but is not limited to, automotive chips, consumer electronics chips, and medical chips; the chip can be, but is not limited to, sensor chips and communication chips.

[0059] Example 2

[0060] Based on the same inventive concept, this embodiment provides a switching power supply regulator, which includes the ramp signal superposition device described in any embodiment of Example 1. Since the switching power supply regulator and the ramp signal superposition device provided by this invention belong to the same inventive concept, the switching power supply regulator provided by this invention possesses at least all the advantages of the ramp signal superposition device provided by this invention. For detailed information on the beneficial effects of the switching power supply regulator provided by this invention, please refer to the above description of the beneficial effects of the ramp signal superposition device provided by this invention; further details will not be repeated here.

[0061] Exemplary, in some exemplary embodiments, the switching power supply regulator may further include a voltage conversion circuit, wherein the second terminal of the ramp voltage superposition circuit of the ramp signal superposition device is coupled to the feedback voltage output terminal of the feedback sampling resistor of the voltage conversion circuit (for example, Figure 1 Medium sampling feedback voltage V FB The feedback voltage output terminal) or the voltage output terminal of the voltage conversion circuit (for example, Figure 1 Output voltage V OUT The third terminal of the superimposed signal output circuit of the ramp signal superimposed device is coupled to the error amplifier of the voltage conversion circuit (for example, the voltage output terminal). Figure 1 The non-inverting input of the comparator in the circuit.

[0062] It should be noted that those skilled in the art should understand that the present invention does not impose excessive limitations on the voltage conversion circuit. For example, in some embodiments, the voltage conversion circuit can buck the input voltage, while in other embodiments, it can boost the input voltage. For more detailed information on the switching power supply regulator provided by the present invention, please refer to related technologies known to those skilled in the art; due to space limitations, they will not be described in detail here.

[0063] Example 3

[0064] This embodiment provides an electronic device, which includes the ramp signal superposition device described in any embodiment of Embodiment 1 or the switching power supply regulator described in any embodiment of Embodiment 2. Since the electronic device provided by this utility model belongs to the same inventive concept as the ramp signal superposition device provided by this utility model, the electronic device provided by this utility model possesses at least all the advantages of the ramp signal superposition device provided by this utility model. For detailed information on the beneficial effects of the electronic device provided by this utility model, please refer to the above description of the beneficial effects of the ramp signal superposition device provided by this utility model; further details will not be repeated here.

[0065] It should be understood that those skilled in the art should appreciate that this invention does not limit the scope of the electronic device. Exemplarily, the electronic device includes, but is not limited to, video products such as televisions, video recorders, and digital cameras; communication products such as mobile phones, communication switching equipment, and communication transmission equipment; learning aids such as translators, learning machines, and electronic dictionaries; and medical devices such as medical imaging equipment and medical testing equipment, etc., without exhaustive list.

[0066] Compared with the prior art, the ramp signal superposition device, switching power supply regulator, and electronic equipment provided by this utility model have the following advantages:

[0067] (1) The ramp signal superposition device provided by this utility model includes a reference voltage follower circuit, which can not only ensure that the voltage at the first node is the same as the reference voltage and amplify the voltage signal to improve the driving capability, but also work stably in a wide temperature range and power fluctuation range, and has good stability and reliability.

[0068] (2) The ramp signal superposition device provided by this utility model includes a ramp voltage superposition circuit, and the ramp voltage superposition circuit can charge the superposition signal output circuit through the second node when the ramp current is in the rising stage, and discharge the superposition signal output circuit through the third node when the ramp current is in the falling stage. Thus, it can not only follow the rising and falling state of the ramp current well, but also suppress noise well and improve the anti-interference ability of the circuit.

[0069] (3) The ramp signal superposition device provided by this utility model includes the superposition signal output circuit. The superposition signal output circuit can output a target electrical signal with good stability, and the target electrical signal can rise / fall synchronously with the rising / falling state of the ramp current.

[0070] In summary, this utility model has the advantages of strong anti-noise capability and small area, and can provide a stable ramp superposition signal. Furthermore, the ramp signal superposition device provided by this utility model has a simple circuit structure and is easy to implement.

[0071] Since the switching power supply regulator and electronic equipment provided by this utility model belong to the same inventive concept as the ramp signal superposition device provided by this utility model, the switching power supply regulator and electronic equipment provided by this utility model have at least all the advantages of the ramp signal superposition device provided by this utility model. For details on the beneficial effects of the switching power supply regulator and electronic equipment provided by this utility model, please refer to the above description of the beneficial effects of the ramp signal superposition device provided by this utility model, which will not be repeated here.

[0072] It should be noted that the apparatus and methods disclosed in the embodiments herein can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments herein. In this regard, each block in a flowchart or block diagram may represent a module, program, or part of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system to perform the specified function or action, or can be implemented using a combination of dedicated hardware and computer instructions.

[0073] In addition, the functional modules in the various embodiments of this article can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0074] The above description is merely a description of preferred embodiments of the ramp signal superposition device, switching power supply regulator, and electronic equipment provided by this utility model, and is not intended to limit the scope of this utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of this utility model. Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of this utility model and its equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A ramp signal superimposing device characterized by comprising: The application relates to a reference voltage follower circuit, a ramp voltage superposition circuit and a superposition signal output circuit. A first end of the reference voltage follower circuit is used for receiving a reference voltage, a second end of the reference voltage follower circuit, a first end of the ramp voltage superposition circuit and a first end of the superposition signal output circuit are coupled to a first node, a second end of the ramp voltage superposition circuit is used for receiving a ramp current, a third end of the ramp voltage superposition circuit and a second end of the superposition signal output circuit are coupled to a second node, and a third end of the superposition signal output circuit outputs a target electric signal. A third end of the reference voltage follower circuit and a fourth end of the ramp voltage superposition circuit receive a supply voltage, a fifth end of the ramp voltage superposition circuit and a fourth end of the superposition signal output circuit are coupled to a third node, a fourth end of the reference voltage follower circuit and the third node are coupled to a reference ground. The reference voltage follower circuit is configured to maintain the voltage at the first node at the reference voltage, the ramp voltage superposition circuit is configured to charge the superposition signal output circuit through the second node when the ramp current is in a rising stage, so that the target electric signal of the superposition signal output circuit is in a rising state, and the superposition signal output circuit discharges the superposition signal output circuit through the third node when the ramp current is in a falling stage, so that the target electric signal of the superposition signal output circuit is in a falling state. The reference voltage follower circuit comprises a first operational amplifier, a first MOS tube and a negative feedback resistance unit, a non-inverting input end of the first operational amplifier is used for receiving the reference voltage, an inverting input end of the first operational amplifier, a first end of the first MOS tube and a first end of the negative feedback resistance unit are coupled to the first node, an output end of the first operational amplifier is coupled to a control end of the first MOS tube, a second end of the first MOS tube receives the supply voltage, and a second end of the negative feedback resistance unit is coupled to the reference ground.

2. The ramp signal superimposing apparatus according to claim 1, characterized by, The ramp voltage superposition circuit comprises a superposition switching unit and a signal superposition unit, a first end of the superposition switching unit is coupled to the first node, a second end of the superposition switching unit is coupled to the second node, a third end of the superposition switching unit and a first end of the signal superposition unit are coupled to a fourth node, a second end of the signal superposition unit is used for receiving the ramp current, a third end of the signal superposition unit receives the supply voltage, and a fourth end of the signal superposition unit is coupled to the third node.

3. The ramp signal superimposing apparatus according to claim 1, characterized by, The superposition switching unit is configured to control the signal superposition unit to be conductive with the second node when the ramp current is in the rising stage, and control the signal superposition unit to be disconnected with the second node when the ramp current is in the falling stage. ​ 4. The ramp signal superimposing apparatus according to claim 3, characterized by, The superimposition switching unit comprises a second operational amplifier, a second MOS tube and a third MOS tube, the positive input end of the second operational amplifier is coupled to the first node, the first end of the second MOS tube is coupled to the second node, the second end of the second MOS tube and the first end of the third MOS tube are coupled to the fourth node, the negative input end of the second operational amplifier, the output end of the second operational amplifier and the second end of the third MOS tube are coupled; The control end of the second MOS tube and the control end of the third MOS tube are configured to respectively receive a pair of mutually inverse logic control signals, so that the second MOS tube is turned on and the third MOS tube is turned off when the ramp current is in the rising stage, and the second MOS tube is turned off and the third MOS tube is turned on when the ramp current is in the falling stage.

5. The ramp signal superimposing apparatus according to claim 3, characterized by, The signal superimposition unit comprises a receiving device for receiving the ramp current and a constant current source, the first end of the receiving device receives the power supply voltage, the second end of the receiving device and the first end of the constant current source are coupled to the fourth node, and the second end of the constant current source is coupled to the third node.

6. The ramp signal superimposing apparatus according to claim 5, characterized by The constant current source comprises a common-source common-gate current mirror.

7. The ramp signal superimposing apparatus according to claim 1, characterized by, The superimposition signal output circuit comprises an RC equivalent circuit.

8. The ramp signal superimposing apparatus according to claim 7, characterized by, The RC equivalent circuit comprises a voltage dividing resistor unit and a fourth MOS tube, the first end of the voltage dividing resistor unit is coupled to the first node, the second end of the voltage dividing resistor unit is coupled to the second node, the common connection point of the third end of the voltage dividing resistor unit and the control end of the fourth MOS tube is used for outputting the target electrical signal, and the first end and the second end of the fourth MOS tube are coupled to the third node.

9. A switching power supply regulator, characterized by The switching power supply voltage stabilizer comprises the ramp signal superimposition device according to any one of claims 1 to 8.

10. An electronic device, comprising: The switching power supply voltage stabilizer comprises the ramp signal superimposition device according to any one of claims 1 to 8.

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