Output voltage compensation circuit and DCDC converter

Abstract

The present disclosure provides an output voltage compensation circuit and a DCDC converter, which relate to the field of semiconductor technology. Among them, the output voltage compensation circuit includes: a voltage conversion module, including a connected switch tube and a control component, the control component is used to output a switch signal, and the switch tube is used to modulate the input voltage based on the switch signal to obtain an output voltage; a calibration module, connected to the voltage output end and the control component, for receiving a feedback voltage generated based on the output voltage; a compensation module, respectively connected to the detection end and the calibration module to receive the detection voltage of the detection end, and the compensation module is used to output a corresponding compensation current based on the detection voltage; the calibration module is used to receive the compensation current, and output a compensation control voltage based on the feedback voltage and the compensation current, and the calibration module is also used to input a compensation control voltage to the control component, and the compensation control voltage is used to correct the switch signal. Through the technical solution disclosed in the present disclosure, the influence of the on-resistance of the switch tube on the output voltage can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of semiconductor technology, and in particular to an output voltage compensation circuit and a DCDC converter. Background Art

[0002] A DC-DC chip is an integrated circuit chip used for direct current (DC) to direct current (DC) conversion. In the design of general large-load DC-DC chips, since the switch tube used has an on-resistance, where the on-resistance refers to the ratio of the voltage across the two ends of the switch tube after it is turned on to the on-current, there will be a voltage drop on the switch tube, and the voltage drop will cause a DC deviation in the output voltage. The greater the load, the greater the voltage drop, resulting in a greater output voltage deviation.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0004] The purpose of the present disclosure is to provide an output voltage compensation circuit and a DCDC converter, which can at least to some extent overcome the problem in the related art that the output voltage has a deviation due to the on-resistance of the switch tube.

[0005] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.

[0006] According to one aspect of the present disclosure, an output voltage compensation circuit is provided, comprising: a voltage conversion module, wherein a voltage input terminal of the voltage conversion module is used to receive an input voltage, the voltage conversion module comprises a connected switch tube and a control component, the control component is used to output a switch signal, the switch tube is used to modulate the input voltage based on the switch signal to obtain an output voltage, and the output voltage is outputted by a voltage output terminal of the voltage conversion module, the voltage output terminal is also provided with a detection terminal; a calibration module, connected to the voltage output terminal and the control component, and used to receive a feedback voltage generated based on the output voltage; a compensation module, connected to the detection terminal and the calibration module respectively, to receive a detection voltage at the detection terminal, the detection voltage is determined based on a load current of the voltage conversion module and an on-resistance of the switch tube, the compensation module is used to output a corresponding compensation current based on the detection voltage; the calibration module is used to receive the compensation current, and output a compensation control voltage based on the feedback voltage and the compensation current, the calibration module is also used to input the compensation control voltage to the control component, the compensation control voltage is used to correct the switch signal, and the corrected switch signal is used to compensate the output voltage.

[0007] In one embodiment of the present disclosure, the calibration module includes a first end, a second end, a first output end and a compensation end, the first end is used to receive a reference voltage, the second end is connected to the voltage output end for receiving the feedback voltage; the first output end is connected to the control component for outputting the compensation control voltage; the compensation end is used to receive the compensation current.

[0008] In one embodiment of the present disclosure, the calibration module includes an error operational amplifier, the non-inverting input terminal of the error operational amplifier serves as the first terminal, the inverting input terminal of the error operational amplifier serves as the second terminal, and the output terminal of the error operational amplifier serves as the first output terminal.

[0009] In one embodiment of the present disclosure, the compensation module includes a third terminal and a second output terminal, the third terminal is connected to the detection terminal and is used to receive the detection voltage; the second output terminal is used to output the compensation current to the calibration module.

[0010] In one embodiment of the present disclosure, the compensation module further includes a fourth terminal, and the fourth terminal is grounded.

[0011] In one embodiment of the present disclosure, the compensation module includes an operational transconductance amplifier, the non-inverting input terminal of the operational transconductance amplifier serves as the fourth terminal, the inverting input terminal of the operational transconductance amplifier serves as the third terminal, and the output terminal of the operational transconductance amplifier serves as the second output terminal.

[0012] In one embodiment of the present disclosure, the switch tube includes a first switch tube and a second switch tube, one end of the first switch tube is connected to one end of the second switch tube, the other end of the first switch tube is grounded, the other end of the second switch tube serves as the voltage input end, and the connection node between the first switch tube and the second switch tube serves as the detection end; the first switch tube also has a first control end, and the second switch tube also has a second control end.

[0013] In one embodiment of the present disclosure, the switching signal includes a first switching signal and a second switching signal that are in opposite directions, and the compensation control voltage is used to correct the duty ratios of the first switching signal and the second switching signal.

[0014] In one embodiment of the present disclosure, the control component includes a connected comparator and a driver, the non-inverting input of the comparator is connected to the calibration module for receiving the compensation control voltage, the inverting input of the comparator is used to receive the ramp signal, and the output of the comparator is used to output a pulse width modulation (PWM) signal; the input of the driver is connected to the output of the comparator for receiving the PWM signal, the first signal output of the driver is connected to the first control terminal for outputting the first switching signal, and the second signal output of the driver is connected to the second control terminal for outputting the second switching signal.

[0015] In one embodiment of the present disclosure, the voltage conversion module further includes: a voltage dividing resistor, which is arranged between the second end and the voltage output end and is used to divide the output voltage to obtain the feedback voltage.

[0016] According to one aspect of the present disclosure, a DCDC converter is provided, comprising: the output voltage compensation circuit described in any one of the above embodiments.

[0017] The output voltage compensation scheme provided by the embodiments of the present disclosure is achieved by setting a detection terminal in the voltage conversion module to transmit a detection voltage determined based on the load current and the on-resistance of the switch tube to the compensation module, and by setting the compensation module so that the compensation module determines the compensation current to be compensated based on the detection voltage. By setting the calibration module, the calibration module can obtain the corresponding feedback voltage based on the detection of the output voltage, and further perform compensation operation on the output voltage in combination with the feedback voltage and the compensation current. Since the conversion of the input voltage to the output voltage is achieved based on the switching signal of the switch tube, the compensation of the output voltage is achieved by correcting the switching signal based on the compensation control voltage. Through the synergy between multiple modules, adaptive compensation of the output voltage can be achieved to reduce the influence of the on-resistance of the switch tube on the output voltage, thereby reducing the deviation of the actual output voltage relative to the target output voltage.

[0018] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0020] Figure 1 A schematic diagram showing a voltage conversion circuit in an embodiment of the present disclosure;

[0021] Figure 2 A schematic diagram showing an output voltage compensation circuit in an embodiment of the present disclosure is shown;

[0022] Figure 3 A schematic diagram showing the connection between a calibration module and a compensation module in an embodiment of the present disclosure is shown;

[0023] Figure 4 A circuit diagram of an output voltage compensation circuit in an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0024] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0025] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0026] In the design of a general large-load DC-DC chip (DC-to-DC circuit chip), since the switch tube of the voltage conversion module in the DC-DC has an on-resistance, there will be a voltage drop on the switch tube. In one embodiment of the present disclosure, Figure 1 The circuit diagram of the voltage conversion module is shown, and the switch tube includes a first switch tube R ON_H And the second switch tube R ON_L , the first switch tube V ON_H With voltage drop V DROP1 , the second switch tube R ON_L With V DROP2 , which will cause a DC deviation in the output voltage, and the load I LOAD The larger the voltage drop, the greater the output voltage V OUT In order to ensure that the output voltage changes with the load (load regulation rate) to meet the application requirements, an output voltage compensation circuit is added to compensate the output voltage.

[0027] The output voltage compensation scheme in this example implementation will be described in more detail below with reference to the accompanying drawings and embodiments.

[0028] like Figure 2 As shown, an output voltage compensation circuit according to an embodiment of the present disclosure includes:

[0029] Voltage conversion module 202, the voltage input end of the voltage conversion module is used to receive the input voltage, the voltage conversion module includes a connected switch tube and a control component, the control component is used to output a switch signal, the switch tube is used to modulate the input voltage based on the switch signal to obtain an output voltage, and the output voltage is output by the voltage output end of the voltage conversion module, and the voltage output end is also provided with a detection end.

[0030] In some embodiments, the voltage input terminal is disposed at one end of the switch tube.

[0031] In some embodiments, the switch signal generated by the control component is input to the switch tube to control the on and off of the switch tube, thereby achieving regulation of the input voltage.

[0032] In some embodiments, the input voltage is modulated by the switch tube to obtain the required output voltage. The switch tube adjusts the input voltage according to the switch signal output by the control component, thereby achieving regulation of the output voltage. At the same time, the module is also provided with a detection terminal for monitoring the voltage condition in the circuit.

[0033] In some embodiments, the switch tube is a MOSFET tube (Metal Oxide Semiconductor Field Effect Transistor).

[0034] In some embodiments, the number of the switching tubes is at least two.

[0035] The calibration module 204 is connected to the voltage output terminal and the control component, and is used to receive a feedback voltage generated based on the output voltage.

[0036] In some embodiments, the feedback voltage may be understood as a voltage that is proportional to the output voltage, that is, the feedback voltage increases as the output voltage increases, and decreases as the output voltage decreases.

[0037] The compensation module 206 is respectively connected to the detection end and the calibration module to receive the detection voltage of the detection end. The detection voltage is determined based on the load current of the voltage conversion module and the on-resistance of the switch tube. The compensation module is used to output a corresponding compensation current based on the detection voltage.

[0038] In some embodiments, since the detection voltage is determined based on the load current of the voltage conversion module and the on-resistance of the switch tube, the detection voltage can reflect information about the load current.

[0039] In some embodiments, the compensation module is connected to the detection end and the calibration module, and is used to receive the detection voltage and output a corresponding compensation current when determining that the output voltage needs to be compensated based on the detection voltage. The compensation current represents the parameters to be compensated determined based on the detection voltage.

[0040] In some embodiments, the voltage conversion module 202 further includes an inductor element L1 connected to the test terminal.

[0041] Among them, in the first switch tube V ON_H Turn on, the second switch tube R ON_L When turned off, the input voltage V IN Charge the SW node; in the first switch tube R ON_H Close the second switch tube R ON_L When turned on, the SW node discharges through the second switch tube; by adjusting the opening / closing of the first switch tube and the second switch tube, power supply of different loads is achieved; the current of the inductor element L1 connected to the detection terminal SW node is the load current, and the voltage value at the detection terminal SW is -I L *R ON_L , where I L Refers to the inductor current, which represents the load current, R ON_L Refers to the on-resistance of the second switch tube.

[0042] The calibration module 204 is used to receive the compensation current and output the compensation control voltage based on the feedback voltage and the compensation current. The calibration module is also used to input the compensation control voltage to the control component. The compensation control voltage is used to correct the switch signal. The corrected switch signal is used to compensate the output voltage.

[0043] In this embodiment, a detection terminal is set in the voltage conversion module to transmit a detection voltage determined based on the load current and the on-resistance of the switch tube to the compensation module. A compensation module is set so that the compensation module determines the compensation current to be compensated based on the detection voltage. A calibration module is set so that the calibration module can obtain a corresponding feedback voltage based on the detection of the output voltage, and further perform a compensation operation on the output voltage in combination with the feedback voltage and the compensation current. Since the conversion of the input voltage to the output voltage is realized based on the switching signal of the switch tube, the compensation of the output voltage is realized by correcting the switching signal based on the compensation control voltage. Through the synergy between multiple modules, adaptive compensation of the output voltage can be realized to reduce the influence of the on-resistance of the switch tube on the output voltage, thereby reducing the deviation of the actual output voltage relative to the target output voltage.

[0044] In one embodiment of the present disclosure, the calibration module includes a first terminal, a second terminal, a first output terminal and a compensation terminal.

[0045] The first terminal is used to receive the reference voltage V REFThe second end is connected to the voltage output end to receive the feedback voltage V FB The first output terminal is connected to the control component and is used to output a compensation control voltage, and the compensation terminal is used to receive a compensation current.

[0046] In some embodiments, the reference voltage V REF It is the reference voltage generated by the internal BGR (Band Gap Reference) of the DCDC conversion chip. For example, the voltage value is 0.5V, 0.6V, 0.768V and 0.8V.

[0047] In some embodiments, the calibration module may include a first PMOS transistor and a second PMOS transistor that are arranged opposite to each other, the source of the first PMOS transistor is connected to the source of the second PMOS transistor, and the gate of the first PMOS transistor receives the reference voltage V as a first terminal. REF The gate of the second PMOS tube serves as the second terminal to receive the feedback voltage V FB , the drain of the second PMOS tube serves as a compensation terminal to receive the compensation current.

[0048] In this embodiment, the reference voltage, feedback voltage and compensation current are processed by the calibration module to generate a compensation control voltage, thereby realizing voltage calibration, wherein the first end is used to receive the reference voltage as a calibration basis, the feedback voltage is a voltage signal obtained by the circuit output before calibration, and is used to compare with the reference voltage, and the compensation current is usually calculated based on parameters such as the detection voltage, and the compensation control voltage is generated to adjust the output voltage so that it is close to the target output voltage, thereby ensuring the reliability of the output voltage compensation.

[0049] like Figure 3 As shown, in one embodiment of the present disclosure, the calibration module includes an error operational amplifier EA, and the non-inverting input terminal of the error operational amplifier is used as the first terminal to receive the reference voltage V REF , the inverting input terminal of the error operational amplifier serves as the second terminal to receive the feedback voltage V FB The output end of the error operational amplifier is used as the first output end to output the compensation control voltage EA -O .

[0050] In this embodiment, an error operational amplifier is used in the calibration module, which can be used to realize the error amplification and calibration functions in the circuit, wherein the non-inverting input terminal receives a reference voltage as a standard reference value for calibration, the inverting input terminal receives a feedback voltage, which is a voltage signal output by the circuit before calibration, and is used for comparison with the reference voltage, the compensation terminal receives a compensation current, and is used to adjust the output of the error operational amplifier according to the size of the compensation current, the output terminal of the error operational amplifier is connected to the control component, and the generated compensation control voltage is transmitted to the control component so that the control component adjusts the control signal to the switch tube, and the calibration interface has high stability and versatility.

[0051] In one embodiment of the present disclosure, the compensation module includes a third terminal and a second output terminal, the third terminal is connected to the detection terminal and is used to receive the detection voltage; the second output terminal is used to output the compensation current to the calibration module.

[0052] In one embodiment of the present disclosure, the compensation module further includes a fourth terminal, which is grounded.

[0053] In this embodiment, the third terminal is connected to the detection terminal, and the detection voltage is input into the compensation module. The detection voltage is compared with the preset voltage inside the compensation module to determine whether the circuit working state meets the expectation. If there is a deviation between the detection voltage and the reference voltage, the compensation module will amplify the error signal, and the amplified error signal will be converted into a corresponding compensation current and output to the second output terminal. The compensation current will be used in the calibration module to generate a compensation control voltage. Therefore, the size and direction of the compensation current can be adjusted through an appropriate feedback mechanism to maintain the stability and accuracy of the circuit.

[0054] like Figure 3 As shown, in one embodiment of the present disclosure, the compensation module includes an operational transconductance amplifier gm, the non-inverting input terminal of the operational transconductance amplifier is used as the fourth terminal to be grounded, and the inverting input terminal of the operational transconductance amplifier is used as the third terminal to receive the detection voltage SW, SW = -I L *R ON_L The output end of the operational transconductance amplifier is used as the second output end to output the compensation current I to the error operational amplifier EA. OS .

[0055] Among them, the operational transconductance amplifier (OTA) can convert an input voltage signal into an output current signal, that is, the output current is a function of the input voltage.

[0056] like Figure 3 As shown, in some embodiments, since the load current I is reflected in the detection voltage SW LThe information is amplified by the operational transconductance amplifier gm to make the output compensation current I OS It can also reflect the load current I L information, the compensation current I OS Through the negative feedback compensation calibration module, the output compensation control voltage EA can be -O Subject to load current I L The load current I L The larger the value, the more negative the detection voltage at the detection end will be during the freewheeling phase, and the compensation current I OS The larger it is, the more compensation will be applied to the calibration module, which will cause EA -O The higher the output becomes, the EA -O The final control loop makes the output voltage V OUT becomes higher, which makes the output voltage V OUT The deviation is small, thus ensuring the load regulation rate.

[0057] In this embodiment, an operational transconductance amplifier is used to construct a compensation module, and the non-inverting input terminal of the operational transconductance amplifier is grounded, which can ensure that there is no interference between the input signal and the ground, making it a pure single-ended input circuit. The detection voltage will serve as the inverting input signal of the operational transconductance amplifier. Through this signal, the operational transconductance amplifier can sense the size of the load current to generate a corresponding compensation current and achieve reliable compensation operation.

[0058] like Figure 4 As shown, in one embodiment of the present disclosure, the voltage input terminal of the voltage conversion module is used to receive the input voltage V IN The voltage conversion module includes a first switch tube R ON_H , the second switch tube R ON_L and a control component, the control component is used to output a switch signal, and the switch tube is used to modulate the input voltage based on the switch signal to obtain an output voltage V OUT , and is output by the voltage output terminal of the voltage conversion module. The voltage output terminal is also provided with a detection terminal to collect the detection voltage SW.

[0059] like Figure 4 As shown, in one embodiment of the present disclosure, the first switch tube R ON_H One end of the second switch tube R ON_L One end of the first switch tube R ON_H The other end of the second switch tube R ON_L The other end of the first switch tube R ON_H And the second switch tube R ON_L The connection node of the first switch tube R ON_H It also has a first control terminal H, a second switch tube R ON_LA second control terminal L is also provided.

[0060] In some embodiments, the voltage conversion module includes a first switch tube and a second switch tube, which are connected together to form a switch unit, one end of the first switch tube is connected to one end of the second switch tube to form a connection node as a detection end, and the other end of the first switch tube is grounded, and the other end of the second switch tube is used as a voltage input end. The control component is responsible for controlling the on-off state of the switch tube, outputting the reverse first switch signal and the second switch signal, and outputting the reverse first switch signal and the reverse second switch signal at the first switch tube R ON_H The second switch R ON_L When it is turned on, the current flows through the inductor, that is, it enters the freewheeling stage. ON_H is turned on, and the second switch tube R ON_L When turned off, the energy stored in the device needs to be released to the load circuit, which is called the cut-off stage.

[0061] like Figure 4 As shown, in some embodiments, since the load current I is reflected in the detection voltage L Information, through the amplification process of gm, makes the output compensation current I OS It can also reflect the load current I L information, the compensation current I OS By negative feedback compensation to EA, the output compensation control voltage EA can be -O Subject to load current I L regulation to ensure the load regulation rate.

[0062] In one embodiment of the present disclosure, the switching signal includes a first switching signal HS and a second switching signal LS which are in opposite directions, and the compensation control voltage is used to modify the duty ratios of the first switching signal and the second switching signal.

[0063] In this embodiment, when the duty cycle of the second switch tube increases, the energy stored in the inductor increases, and the output voltage also increases accordingly. Conversely, if the duty cycle of the second switch tube is reduced, the output voltage may decrease. By controlling the duty cycle of the first switch tube and the second switch tube based on the compensation control voltage, the voltage conversion module can achieve accurate compensation for the output voltage.

[0064] like Figure 4 As shown in one embodiment of the present disclosure, the voltage conversion module further includes: voltage dividing resistors R1 and R2, which are arranged between the second end and the voltage output end and are used to divide the output voltage to obtain a feedback voltage.

[0065] In some embodiments, the feedback voltage V FB It can be a voltage signal obtained after the output voltage passes through the voltage dividing resistors R1 and R2.

[0066] like Figure 4 As shown, in one embodiment of the present disclosure, the control component includes a comparator C and a driver D connected.

[0067] The non-inverting input terminal of the comparator C is connected to the calibration module to receive the compensation control voltage EA -O The inverting input terminal of the comparator is used to receive the ramp signal RAMP, and the output terminal of the comparator is used to output a pulse width modulation PWM signal.

[0068] The input end of the driver D is connected to the output end of the comparator for receiving a PWM signal. The first signal output end of the driver D is connected to the first control end H for outputting a first switching signal HS. The second signal output end of the driver is connected to the second control end L for outputting a second switching signal LS.

[0069] In some embodiments, the ramp signal RAMP is a gradually changing signal, typically a linear ramp waveform, the rate of change and period of the signal can be controlled by elements in the control circuit. In PWM control, the internal ramp signal is typically used to generate a fixed ramp reference.

[0070] In some embodiments, the comparator compares the compensation control voltage with the internal ramp signal RAMP. When the compensation control voltage exceeds the ramp signal, the comparator outputs a high level. When the compensation control voltage is lower than the ramp signal, the comparator outputs a low level. Based on this comparison result, a PWM control signal is generated. The duty cycle and frequency of the PWM control signal depend on the relative relationship between the compensation control voltage and the ramp signal.

[0071] like Figure 4 As shown, in some embodiments, the non-inverting input terminal of the error operational amplifier EA is used as the first terminal to receive the on-chip reference voltage as the reference voltage V REF , the inverting input terminal of the error operational amplifier serves as the second terminal to receive the feedback voltage V FB , the error operational amplifier EA detects the feedback voltage V FB With reference voltage V REF The relationship between them is amplified to generate the compensation control voltage EA -O , compensation control voltage EA -O It is then compared with the internal ramp signal RAMP to generate a PWM control signal.

[0072] A DCDC converter according to an embodiment of the present disclosure includes: the output voltage compensation circuit described in any one of the above embodiments.

[0073] In the present disclosure, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances.

[0074] In the description of the present disclosure, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present disclosure.

[0075] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0076] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure. After considering the specification and practicing the utility model disclosed herein, those skilled in the art will easily think of other embodiments of the present disclosure. The present disclosure is intended to cover any variation, use or adaptive change of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field that are not disclosed in the present disclosure. The description and examples are regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the attached claims.

Claims

1. An output voltage compensation circuit, characterized in that: include: A voltage conversion module, wherein the voltage input terminal of the voltage conversion module is used to receive an input voltage, the voltage conversion module comprises a connected switch tube and a control component, the control component is used to output a switch signal, the switch tube is used to modulate the input voltage based on the switch signal to obtain an output voltage, and the output voltage is outputted by the voltage output terminal of the voltage conversion module, and the voltage output terminal is also provided with a detection terminal; a calibration module, connected to the voltage output terminal and the control component, and configured to receive a feedback voltage generated based on the output voltage; A compensation module, connected to the detection end and the calibration module respectively, to receive a detection voltage of the detection end, wherein the detection voltage is determined based on a load current of the voltage conversion module and an on-resistance of the switch tube, and the compensation module is used to output a corresponding compensation current based on the detection voltage; The calibration module is used to receive the compensation current and output a compensation control voltage based on the feedback voltage and the compensation current. The calibration module is also used to input the compensation control voltage to the control component. The compensation control voltage is used to correct the switching signal, and the corrected switching signal is used to compensate the output voltage.

2. The output voltage compensation circuit according to claim 1, characterized in that: The calibration module includes a first terminal, a second terminal, a first output terminal and a compensation terminal. The first end is used to receive a reference voltage, and the second end is connected to the voltage output end and is used to receive the feedback voltage; The first output terminal is connected to the control component and is used to output the compensation control voltage; The compensation terminal is used for receiving the compensation current.

3. The output voltage compensation circuit according to claim 2, characterized in that: The calibration module includes an error operational amplifier, a non-inverting input terminal of the error operational amplifier serves as the first terminal, an inverting input terminal of the error operational amplifier serves as the second terminal, and an output terminal of the error operational amplifier serves as the first output terminal.

4. The output voltage compensation circuit according to claim 1, characterized in that: The compensation module includes a third terminal and a second output terminal, The third terminal is connected to the detection terminal and is used to receive the detection voltage; The second output terminal is used to output the compensation current to the calibration module.

5. The output voltage compensation circuit according to claim 4, characterized in that: The compensation module further includes a fourth terminal, which is grounded.

6. The output voltage compensation circuit according to claim 5, characterized in that: The compensation module includes an operational transconductance amplifier, a non-inverting input terminal of the operational transconductance amplifier serves as the fourth terminal, an inverting input terminal of the operational transconductance amplifier serves as the third terminal, and an output terminal of the operational transconductance amplifier serves as the second output terminal.

7. The output voltage compensation circuit according to claim 1, characterized in that: The switch tube includes a first switch tube and a second switch tube. One end of the first switch tube is connected to one end of the second switch tube, the other end of the first switch tube is grounded, the other end of the second switch tube serves as the voltage input end, and the connection node between the first switch tube and the second switch tube serves as the detection end; The first switch tube also has a first control end, and the second switch tube also has a second control end.

8. The output voltage compensation circuit according to claim 7, characterized in that: The switch signal includes a first switch signal and a second switch signal which are in opposite directions. The compensation control voltage is used to correct the duty ratio of the first switching signal and the second switching signal.

9. The output voltage compensation circuit according to claim 8, characterized in that: The control assembly includes a comparator and a driver connected together, The non-inverting input terminal of the comparator is connected to the calibration module and is used to receive the compensation control voltage. The inverting input terminal of the comparator is used to receive the ramp signal. The output terminal of the comparator is used to output a pulse width modulation (PWM) signal. The input end of the driver is connected to the output end of the comparator for receiving the PWM signal, the first signal output end of the driver is connected to the first control end for outputting the first switching signal, and the second signal output end of the driver is connected to the second control end for outputting the second switching signal.

10. The output voltage compensation circuit according to claim 2, characterized in that: The voltage conversion module also includes: A voltage-dividing resistor is provided between the second end and the voltage output end, and is used for dividing the output voltage to obtain the feedback voltage.

11. A DCDC converter, characterized in that: include: The output voltage compensation circuit according to any one of claims 1 to 10.

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