Power-on modulation circuit, voltage conversion circuit and electronic equipment

Abstract

The invention discloses a power-on modulation circuit, a voltage conversion circuit and electronic equipment. The power-on modulation circuit comprises an offset introduction module, a comparison module and a modulation signal generation module, and the offset introduction module receives soft start control voltage and introduces offset voltage to adjust the soft start control voltage; the comparison module is used for comparing the adjusted soft start control voltage with the feedback voltage to obtain a first control signal; the modulation signal generation module is used for generating a modulation signal based on the first control signal and the clock signal so as to modulate the charging frequency in the power-on process of the voltage conversion circuit. According to the power-on modulation circuit, the feedback voltage of the elevator conversion circuit can better follow the soft start control voltage, and then output voltage ripples in the power-on process are reduced.

Description

Technical Field

[0001] This application relates to the field of voltage conversion circuit power-on technology, and in particular to a power-on modulation circuit, a voltage conversion circuit, and an electronic device. Background Technology

[0002] During the power-on process of the voltage conversion circuit, since the frequency of the clock signal is fixed, the charging time of each cycle is at least the minimum charging time specified by the system. This causes the output voltage of the voltage conversion circuit to accumulate too much charge within the system response time, resulting in a high output voltage. However, the output voltage will drop after the system response. Therefore, this will cause the voltage conversion circuit to have a large output voltage ripple during the power-on process. Summary of the Invention

[0003] To address the aforementioned problems, this application provides a power-on modulation circuit, a voltage conversion circuit, and an electronic device, which aim to solve the problems mentioned above.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a power-on modulation circuit, which includes an offset introduction module, a comparison module, and a modulation signal generation module. The offset introduction module receives a soft-start control voltage and introduces an offset voltage to adjust the soft-start control voltage. The first input terminal of the comparison module is connected to the offset introduction module, and the second input terminal of the comparison module receives the feedback voltage during the power-on process of the voltage conversion circuit, and is used to compare the adjusted soft-start control voltage and the feedback voltage to obtain a first control signal. The first input terminal of the modulation signal generation module is connected to the output terminal of the comparison module, the second input terminal of the modulation signal generation module receives a clock signal, and the output terminal of the modulation signal generation module is connected to the drive module of the voltage conversion circuit, and is used to generate a modulation signal based on the first control signal and the clock signal to modulate the charging frequency during the power-on process of the voltage conversion circuit.

[0005] Specifically, based on the first control signal being at the first level, the modulation signal generation module generates a pulse signal as the modulation signal in response to the rising edge of the clock signal; based on the first control signal being at the second level, the modulation signal generation module does not respond to the rising edge of the clock signal.

[0006] The offset voltage includes a first offset voltage and a second offset voltage. The offset introduction module includes a first offset voltage generation module, a second offset voltage generation module, and a control module. The first offset voltage generation module is used to generate the first offset voltage. The second offset voltage generation module is used to generate the second offset voltage, wherein the second offset voltage is greater than the first offset voltage. The control module is connected to the first offset voltage generation module and the second offset voltage generation module respectively, and is used to introduce the first offset voltage or the second offset voltage for the soft-start control voltage based on the first control signal and the clock signal.

[0007] The control module includes a switch signal generation module and a switching module. The switch signal generation module generates a second control signal based on a first control signal and a clock signal. The switching module is connected to the switch signal generation module, the first offset voltage generation module, and the second offset voltage generation module. In response to the second control signal being at a third level, the switching module introduces a first offset voltage for the soft-start control voltage. In response to the second control signal being at a fourth level, the switching module introduces a second offset voltage for the soft-start control voltage.

[0008] The switching signal generation module includes a D flip-flop. The data input terminal of the D flip-flop receives a first control signal, the clock input terminal of the D flip-flop receives a clock signal, and the output terminal of the D flip-flop is connected to the switching module. The D flip-flop is used to generate a second control signal based on the first control signal and the clock signal and send it to the switching module.

[0009] The switching module includes a first switch and a second switch; the first path terminal of the first switch and the first path terminal of the second switch receive a soft-start control voltage; the second path terminal of the first switch is connected to a first offset voltage generating module; the second path terminal of the second switch is connected to a second offset voltage generating module; both the first offset voltage generating module and the second offset generating module are connected to the first input terminal of the comparison module; in response to the second control signal being at a third level, the first switch is turned on and the second switch is turned off; in response to the second control signal being at a fourth level, the second switch is turned on and the first switch is turned off.

[0010] The switching module includes a first switch and a second switch; the first offset voltage generation module receives the soft-start control voltage, the first offset voltage generation module and the second offset voltage generation module are connected in series, the second offset voltage generation module is connected to the first input terminal of the comparison module, the first switch and the second offset voltage generation module are connected in parallel, and the second switch and the first offset voltage generation module are connected in parallel; in response to the second control signal being at the third level, the first switch is turned on and the second switch is turned off; in response to the second control signal being at the fourth level, the second switch is turned on and the first switch is turned off.

[0011] The soft-start control voltage is a voltage signal that gradually increases during the power-on process of the voltage conversion circuit.

[0012] To solve the above-mentioned technical problems, another technical solution adopted in this application is: to provide a voltage conversion circuit, which includes any of the above-mentioned power-on modulation circuit, PWM modulation module and driving module; the PWM modulation module is used to generate PWM modulation signal based on soft-start control voltage and feedback voltage during the power-on process of the voltage conversion circuit; the driving module is connected to the PWM modulation module and the power-on modulation circuit respectively, and is used to control the conduction and cutoff of the high-side transistor and freewheeling transistor in the voltage conversion circuit based on the PWM modulation signal and the modulation signal.

[0013] Specifically, when the modulation signal is at a transition edge, the drive module controls the high-side transistor to turn on; when the PWM modulation signal and the modulation signal are at the same transition edge, the drive module controls the high-side transistor to turn off.

[0014] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide an electronic device that includes the voltage conversion circuit described above.

[0015] Unlike existing technologies, the power-on modulation circuit of this application includes an offset introduction module, a comparison module, and a modulation signal generation module. The offset introduction module receives the soft-start control voltage and introduces an offset voltage to adjust the soft-start control voltage. The first input terminal of the comparison module is connected to the offset introduction module, and the second input terminal of the comparison module receives the feedback voltage during the power-on process of the voltage conversion circuit. This feedback voltage is used to compare the adjusted soft-start control voltage and the feedback voltage to obtain a first control signal. The first input terminal of the modulation signal generation module is connected to the output terminal of the comparison module, and the second input terminal of the modulation signal generation module receives a clock signal. The output terminal of the modulation signal generation module is connected to the drive module of the voltage conversion circuit. This modulated signal is generated based on the first control signal and the clock signal to modulate the charging frequency during the power-on process of the voltage conversion circuit. Through this method, this application can modulate the charging frequency during the power-on process of the voltage conversion circuit by comparing the soft-start control voltage and the feedback voltage without changing the external circuitry. This allows the feedback voltage to better follow the soft-start control voltage during power-on, thereby reducing the ripple of the output voltage during power-on. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0017] Figure 1 This is a schematic diagram of the structure of the first embodiment of the power-on modulation circuit of this application;

[0018] Figure 2 This is a schematic diagram of the second embodiment of the power-on modulation circuit of this application;

[0019] Figure 3 This is a schematic diagram of the third embodiment of the power-on modulation circuit of this application;

[0020] Figure 4This is a schematic diagram of the fourth embodiment of the power-on modulation circuit of this application;

[0021] Figure 5 This is a schematic diagram of the structure of an embodiment of the voltage conversion circuit of this application;

[0022] Figure 6 This is a waveform diagram of each signal during the power-on process of the voltage conversion circuit of this application;

[0023] Figure 7 This is a schematic diagram of the structure of an embodiment of the electronic device of this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all structures. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] During the power-on process of the voltage conversion circuit, since the frequency of the clock signal is fixed, the charging time of each cycle is at least the minimum charging time specified by the system. This causes the output voltage of the voltage conversion circuit to accumulate too much charge within the system response time, resulting in a high output voltage. However, the output voltage will drop after the system response. Therefore, this will cause the voltage conversion circuit to have a large output voltage ripple during the power-on process.

[0027] To address the aforementioned problems, this application first proposes a power-on modulation circuit, please refer to [link to relevant documentation]. Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the power-on modulation circuit of this application. Figure 1 As shown, the power-on modulation circuit 100 in this embodiment includes an offset introduction module 10, a comparison module 20, and a modulation signal generation module 30.

[0028] The offset introduction module 10 receives the soft-start control voltage and introduces the offset voltage to adjust the soft-start control voltage. The first input terminal of the comparison module 20 is connected to the offset introduction module 10, and the second input terminal of the comparison module 20 receives the feedback voltage during the power-on process of the voltage conversion circuit. It is used to compare the adjusted soft-start control voltage and the feedback voltage to obtain the first control signal. The first input terminal of the modulation signal generation module 30 is connected to the output terminal of the comparison module 20, the second input terminal of the modulation signal generation module 30 receives the clock signal, and the output terminal of the modulation signal generation module 30 is connected to the drive module of the voltage conversion circuit. It is used to generate a modulation signal based on the first control signal and the clock signal to modulate the charging frequency during the power-on process of the voltage conversion circuit.

[0029] In this embodiment, the soft-start control voltage is a voltage signal that gradually increases during the power-on process of the voltage conversion circuit. The offset introduction module 10 is used to generate an offset voltage and adjust the soft-start control voltage using the offset voltage. The adjusted offset voltage is compared with the feedback voltage of the voltage conversion circuit by the comparison module 20 to generate a first control signal. In this embodiment, if the soft-start control voltage adjusted by the offset voltage is greater than or equal to the feedback voltage, the output first control signal is at a first level; if the soft-start control voltage adjusted by the offset voltage is less than the feedback voltage, the output first control signal is at a second level.

[0030] After acquiring the first control signal, the modulation signal generation module 30 can modulate based on the acquired first control signal and the clock signal of the voltage conversion circuit to obtain a modulation signal, thereby modulating the charging frequency during the power-on process of the voltage conversion circuit. The specific modulation process is described below and will not be described in detail here.

[0031] Unlike existing technologies, the power-on modulation circuit 100 of this application includes an offset introduction module 10, a comparison module 20, and a modulation signal generation module 30. The offset introduction module 10 receives the soft-start control voltage and introduces the offset voltage to adjust the soft-start control voltage. The first input terminal of the comparison module 20 is connected to the offset introduction module 10, and the second input terminal of the comparison module 20 receives the feedback voltage during the power-on process of the voltage conversion circuit. It is used to compare the adjusted soft-start control voltage and the feedback voltage to obtain a first control signal. The first input terminal of the modulation signal generation module 30 is connected to the output terminal of the comparison module 20, the second input terminal of the modulation signal generation module 30 receives a clock signal, and the output terminal of the modulation signal generation module 30 is connected to the drive module of the voltage conversion circuit. It is used to generate a modulation signal based on the first control signal and the clock signal to modulate the charging frequency during the power-on process of the voltage conversion circuit. In the above manner, this application can modulate the charging frequency of the voltage conversion circuit during power-on without changing the external circuit by comparing the soft-start control voltage and the feedback voltage, so that the feedback voltage can better follow the soft-start control voltage during power-on, thereby reducing the ripple of the output voltage during power-on.

[0032] Optionally, based on the above embodiments, in this embodiment, based on the first control signal being at a first level, the modulation signal generation module 30 generates a pulse signal as a modulation signal in response to the rising edge of the clock signal; based on the first control signal being at a second level, the modulation signal generation module 30 does not respond to the rising edge of the clock signal.

[0033] In this embodiment, when the soft-start control voltage after offset voltage adjustment is greater than or equal to the feedback voltage, the output first control signal is at a first level. In this embodiment, the first level indicates that the difference between the feedback voltage and the soft-start control voltage in the voltage conversion circuit is too large. At this time, the modulation signal generation module 30, based on the first control signal being at the first level, generates a pulse signal as a modulation signal in response to the rising edge of the clock signal. This pulse signal controls the high-side transistor in the voltage conversion circuit to turn on, thereby increasing the output voltage and reducing the difference between the feedback voltage and the soft-start control voltage, allowing the feedback voltage to better follow the gradually rising soft-start control voltage. In this embodiment, the pulse signal is set to a logic high level; in other embodiments, the pulse signal can also be set to a logic low level, and this is not a limitation.

[0034] When the soft-start control voltage after offset voltage adjustment is less than the feedback voltage, and the output first control signal is at the second level, it means that the difference between the feedback voltage of the voltage conversion circuit and the soft-start control voltage is not large. If the clock signal is at its rising edge at this time, the modulation signal generation module 30 in this embodiment will not generate a pulse signal, and the modulation signal will therefore remain at a logic low level, eliminating the need to control the high-side transistor of the voltage conversion circuit to turn on and increase the output voltage. Through the above method, this embodiment can effectively control the difference between the soft-start control voltage and the feedback voltage within a certain range using the modulation signal, ensuring that the feedback voltage follows the soft-start control voltage well during power-on, thereby effectively reducing the output voltage ripple during power-on.

[0035] In this embodiment, the first level is a logic high level and the second level is a logic low level. In other embodiments, the first level can also be set to a logic low level and the second level can be set to a logic high level. This is not a limitation.

[0036] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of the second embodiment of the power-on modulation voltage of this application. In this embodiment, the offset voltage includes a first offset voltage and a second offset voltage. Figure 2 As shown, the offset introduction module 10 in this embodiment includes a first offset voltage generation module 12, a second offset voltage generation module 13, and a control module 11.

[0037] The first offset voltage generating module 12 is used to generate a first offset voltage; the second offset voltage generating module 13 is used to generate a second offset voltage, wherein the second offset voltage is greater than the first offset voltage; the control module 11 is connected to the first offset voltage generating module 12 and the second offset voltage generating module 13 respectively, and is used to introduce the first offset voltage or the second offset voltage for the soft start control voltage based on the first control signal and the clock signal.

[0038] In this embodiment, the comparison module 20 can be configured as a comparator. The first offset voltage generation module 12 and the second offset voltage generation module 13 are both connected to the first input terminal of the comparison module 20, and are used to generate the first offset voltage and the second offset voltage, respectively. In this embodiment, there are various methods for the first offset voltage generation module 12 and the second offset voltage generation module 13 to generate the offset voltage. For example, the bias current of the first input terminal of the comparator can be changed using a first control signal and a clock signal, so that the bias currents between the two input terminals of the comparator are different, thereby generating an offset voltage; or the size of the input transistor at the first input terminal of the comparator can be changed using the first control signal and the clock signal, so that the size of the input transistor between the two input terminals of the comparator is different, thereby generating an offset voltage. In other embodiments, other methods can also be used to generate the offset voltage, which are not limited here.

[0039] Furthermore, in this embodiment, when the control module 11 introduces a first offset voltage or a second offset voltage to the soft-start control voltage, it calculates the difference between the soft-start control voltage and the first offset voltage or the second offset voltage, that is, the adjusted soft-start control voltage is less than the initial soft-start control voltage.

[0040] Optionally, please refer to Figure 3 , Figure 3 This is a schematic diagram of the third embodiment of the power-on modulation circuit of this application. Figure 3 As shown, the control module 11 in this embodiment includes a switch signal generation module 111 and a switching module 112. The switch signal generation module 111 is used to generate a second control signal based on a first control signal and a clock signal. The switching module 112 is connected to the switch signal generation module 111, the first offset voltage generation module 12, and the second offset voltage generation module 13, respectively. In response to the second control signal being at a third level, the switching module 112 introduces a first offset voltage for the soft-start control voltage. In response to the second control signal being at a fourth level, the switching module 112 introduces a second offset voltage for the soft-start control voltage.

[0041] That is, in this embodiment, the switching signal generation module 111 first generates a second control signal based on the first control signal and the clock signal, and the switching module 112 then uses the second control signal to reliably introduce the first offset voltage or the second offset voltage.

[0042] When the second control signal is at the third level, a first offset voltage is introduced into the soft-start control voltage; when the second control signal is at the fourth level, a second offset voltage is introduced into the soft-start control voltage.

[0043] Optionally, such as Figure 3As shown, in this embodiment, the switch signal generation module 111 includes a D flip-flop. The data input terminal D of the D flip-flop receives a first control signal, the clock input terminal clk of the D flip-flop receives a clock signal, and the output terminal Q of the D flip-flop is connected to the switching module 112. The D flip-flop is used to generate a second control signal based on the first control signal and the clock signal and send it to the switching module 112.

[0044] That is, in this embodiment, when the first control signal is at the first level and the clock signal reaches the rising edge, the second control signal maintains the fourth level; when the first control signal is at the second level and the clock signal reaches the rising edge, the second control signal maintains the third level.

[0045] In other embodiments, the switch signal generation module 111 may also be composed of other logic gate circuits, as long as the above functions are implemented, and no restrictions are imposed here.

[0046] Optionally, such as Figure 3 As shown, in this embodiment, the switching module 112 includes a first switch S1 and a second switch S2; the first path terminal of the first switch S1 and the first path terminal of the second switch S2 receive a soft-start control voltage; the second path terminal of the first switch S1 is connected to the first offset voltage generating module 12; the second path terminal of the second switch S2 is connected to the second offset voltage generating module 13, and both the first offset voltage generating module 12 and the second offset generating module 13 are connected to the first input terminal of the comparison module 20; in response to the second control signal being at the third level, the first switch S1 is turned on and the second switch S2 is turned off; in response to the second control signal being at the fourth level, the second switch S2 is turned on and the first switch S1 is turned off.

[0047] In other embodiments, please refer to Figure 4 , Figure 4 This is a schematic diagram of the fourth embodiment of the power-on modulation circuit of this application. Figure 4 As shown, the switching module 112 includes a first switch S1 and a second switch S2; the first offset voltage generating module 12 receives the soft-start control voltage, the first offset voltage generating module 12 and the second offset voltage generating module 13 are connected in series, the second offset voltage generating module 13 is connected to the first input terminal of the comparison module 20, the first switch S1 and the second offset voltage generating module 13 are connected in parallel, and the second switch S2 and the first offset voltage generating module 12 are connected in parallel; in response to the second control signal being at the third level, the first switch S1 is turned on and the second switch S2 is turned off; in response to the second control signal being at the fourth level, the second switch S2 is turned on and the first switch S1 is turned off.

[0048] like Figure 3 and Figure 4As shown in the embodiments of this application, the application can control the conduction and de-conduction of the first switch S1 and the second switch S2 by the second control signal. When the second control signal is at the third level, the first switch S1 is turned on and the second switch S2 is turned off, introducing the first offset voltage VOS1 for the soft-start control voltage; when the second control signal is at the fourth level, the second switch S2 is turned on and the first switch S1 is turned off, introducing the second offset voltage VOS2 for the soft-start control voltage.

[0049] In this context, the third level of the second control signal mentioned above is a logic low level, and the fourth level is a logic high level. In other embodiments, the third level may also be set to a logic high level, and the fourth level may be set to a logic low level; this is not a limitation here.

[0050] Based on the embodiments described above, the power-on modulation circuit 100 of this embodiment can control the magnitude of the introduced offset voltage by comparing the soft-start control voltage after the offset voltage is introduced with the first control signal generated by the feedback voltage and the second control signal generated by the clock signal. Furthermore, it can modulate the charging frequency of the voltage conversion circuit during power-on by generating a modulation signal using the first control signal and the clock signal. This effectively controls the difference between the soft-start control voltage and the feedback voltage between the first offset voltage and the second offset voltage, ensuring that the feedback voltage can follow the soft-start control voltage well during power-on, thereby effectively reducing the ripple of the output voltage during power-on of the voltage conversion circuit.

[0051] That is, when the soft-start control voltage after the introduction of the first offset voltage is greater than or equal to the feedback voltage, the output first control signal is at the first level, which means that the difference between the feedback voltage and the soft-start control voltage of the voltage conversion circuit is greater than the first offset voltage. At this time, if the clock signal is at the rising edge, the modulation signal generation module 30 of this embodiment will generate a pulse signal as a modulation signal (the pulse signal in this embodiment is set to a logic high level) to control the high-side transistor M1 in the voltage conversion circuit to turn on, thereby increasing the output voltage and reducing the difference between the feedback voltage and the soft-start control voltage, so that the feedback voltage can better follow the gradually rising soft-start control voltage. In the example, the control module 11 in the comparison module 20 will also control the first switch S1 to turn off and the second switch S2 to turn on, thereby introducing a second offset voltage to the soft-start control voltage. At this time, if the soft-start control voltage adjusted by the second offset voltage is less than the feedback voltage, the output first control signal will jump to the second level. This means that the difference between the soft-start control voltage of the voltage conversion circuit and the feedback voltage is less than the second offset voltage. At this time, even if the clock signal is at the rising edge, the modulation signal generation module 30 of this embodiment will not generate a pulse signal. The modulation signal is therefore maintained at the logic low level, and there is no need to control the high-side transistor M1 of the voltage conversion circuit to turn on to increase the output voltage.

[0052] Optionally, this application further proposes a voltage conversion circuit, please refer to [link to relevant documentation]. Figure 5 , Figure 5 This is a schematic diagram of the structure of an embodiment of the voltage conversion circuit of this application. Figure 5 As shown, the voltage conversion circuit 200 of this embodiment includes the power-on modulation circuit 100, PWM modulation module 210 and drive module 220 of any of the above embodiments.

[0053] The PWM modulation module 210 is used to generate a PWM modulation signal based on the soft-start control voltage and feedback voltage during the power-on process of the voltage conversion circuit 200; the drive module 220 is connected to the PWM modulation module 210 and the power-on modulation circuit 100 respectively, and is used to control the conduction and cutoff of the high-side transistor M1 and the freewheeling transistor M2 in the voltage conversion circuit 200 based on the PWM modulation signal and the modulation signal.

[0054] Among them, such as Figure 5 As shown, in the power-on modulation circuit 100, the comparator module 20 is a comparator CMP1, and the PWM modulation module 210 includes an amplifier EA and a comparator CMP2. The amplifier EA is used to obtain the difference between the soft-start control voltage and the feedback voltage during the power-on process, and the comparator CMP2 uses the difference and the switching node voltage at the switching node of the voltage conversion circuit 200 to obtain the corresponding PWM modulation signal. In addition, the voltage conversion circuit 200 also includes a high-side transistor M1, a freewheeling transistor M2, an inductor L, and a capacitor COUT.

[0055] Taking the voltage conversion circuit 200 of this embodiment as an example, the driving module 220 of this embodiment controls the conduction and cutoff of the high-side transistor M1 and the freewheeling transistor M2 based on the PWM modulation signal and the modulation signal. When the high-side transistor M1 is turned on, the freewheeling transistor M2 is turned off, and the power supply VIN charges the inductor L, the capacitor COUT and the external load. When the high-side transistor M1 is turned off, the freewheeling transistor M2 is turned on. At this time, the voltage direction across the inductor L is opposite to the voltage direction during the charging stage. At this time, the inductor L and the capacitor COUT discharge to maintain the output voltage of the power supply signal.

[0056] Optionally, in this embodiment, the driving module 220 controls the high-side transistor M1 to turn on when the modulation signal is at a transition edge; and controls the high-side transistor M1 to turn off when the PWM modulation signal is at the same transition edge.

[0057] That is, in this embodiment, when the modulation signal is at the rising edge, the drive module 220 controls the high-side transistor M1 to turn on, so that the power supply VIN charges the inductor L, capacitor COUT and external load to quickly raise the output voltage and feedback voltage; when the PWM modulation signal is at the rising edge, the drive module 220 controls the high-side transistor M1 to turn off.

[0058] In other embodiments, the drive module 220 can be configured to turn on the high-side transistor M1 in response to the falling edge of the modulation signal, so that the power supply VIN charges the inductor L, capacitor COUT, and external load to quickly raise the output voltage and feedback voltage; the drive module 220 can also turn off the high-side transistor M1 in response to the falling edge of the PWM modulation signal. However, to achieve this configuration, the circuit described above needs to be adjusted, that is, the signals input to the positive and negative input terminals of the comparator of the comparison module 20 need to be interchanged, and if the switch signal generation module 111 is a D flip-flop, it needs to be set to fall-edge triggering.

[0059] In one application scenario, based on the above embodiments, please refer to... Figure 6 , Figure 6 This is a waveform diagram of each signal during the power-on process of the voltage conversion circuit of this application. For example... Figure 6 As shown, the difference between the soft-start control signal and the feedback voltage is basically between the first offset voltage and the second offset voltage during the power-on process. Therefore, the feedback voltage of the voltage conversion circuit 200 can follow the soft-start control signal well during the power-on process, thereby reducing the ripple of the output voltage during the power-on process.

[0060] Optionally, this application further proposes an electronic device 300, see [link to relevant documentation]. Figure 7 , Figure 7 This is a schematic diagram of the structure of an embodiment of the electronic device of this application. Figure 7 As shown, the electronic device 300 of this embodiment includes the voltage conversion circuit 200 of the above embodiment.

[0061] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural changes made based on the description and drawings of this application, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A power-on modulation circuit, characterized in that, The power-on modulation circuit, applied to a voltage conversion circuit, includes: An offset introduction module receives the soft-start control voltage and introduces an offset voltage to adjust the soft-start control voltage; The comparison module has a first input terminal connected to the offset introduction module, and a second input terminal receiving the feedback voltage during the power-on process of the voltage conversion circuit. The comparison module is used to compare the adjusted soft-start control voltage and the feedback voltage to obtain a first control signal. A modulation signal generation module is provided, wherein the first input terminal of the modulation signal generation module is connected to the output terminal of the comparison module, the second input terminal of the modulation signal generation module receives a clock signal, and the output terminal of the modulation signal generation module is connected to the drive module of the voltage conversion circuit. The module is used to generate a modulation signal based on the first control signal and the clock signal to modulate the charging frequency during the power-on process of the voltage conversion circuit.

2. The power-on modulation circuit according to claim 1, characterized in that, Based on the first control signal being at a first level, the modulation signal generation module generates a pulse signal as the modulation signal in response to the rising edge of the clock signal; Since the first control signal is at the second level, the modulation signal generation module does not respond to the rising edge of the clock signal.

3. The power-on modulation circuit according to claim 1, characterized in that, The offset voltage includes a first offset voltage and a second offset voltage, and the offset introduction module includes: A first offset voltage generation module is used to generate the first offset voltage; A second offset voltage generating module is used to generate a second offset voltage, wherein the second offset voltage is greater than the first offset voltage; The control module is connected to the first offset voltage generation module and the second offset voltage generation module respectively, and is used to introduce the first offset voltage or the second offset voltage to the soft-start control voltage based on the first control signal and the clock signal.

4. The power-on modulation circuit according to claim 3, characterized in that, The control module includes: A switch signal generation module is used to generate a second control signal based on the first control signal and the clock signal; The switching module is connected to the switch signal generation module, the first offset voltage generation module, and the second offset voltage generation module respectively. In response to the second control signal being at the third level, the switching module introduces the first offset voltage for the soft-start control voltage; in response to the second control signal being at the fourth level, the switching module introduces the second offset voltage for the soft-start control voltage.

5. The power-on modulation circuit according to claim 4, characterized in that, The switching signal generation module includes a D flip-flop. The data input terminal of the D flip-flop receives the first control signal, the clock input terminal of the D flip-flop receives the clock signal, and the output terminal of the D flip-flop is connected to the switching module. The D flip-flop is used to generate a second control signal based on the first control signal and the clock signal and send it to the switching module.

6. The power-on modulation circuit according to claim 4, characterized in that, The switching module includes a first switch and a second switch; The first path terminal of the first switch and the first path terminal of the second switch receive the soft-start control voltage; the second path terminal of the first switch is connected to the first offset voltage generating module; the second path terminal of the second switch is connected to the second offset voltage generating module; both the first offset voltage generating module and the second offset generating module are connected to the first input terminal of the comparison module. In response to the second control signal being at the third level, the first switch is turned on and the second switch is turned off; in response to the second control signal being at the fourth level, the second switch is turned on and the first switch is turned off.

7. The power-on modulation circuit according to claim 4, characterized in that, The switching module includes a first switch and a second switch; The first offset voltage generating module receives the soft-start control voltage. The first offset voltage generating module and the second offset generating module are connected in series. The second offset generating module is connected to the first input terminal of the comparison module. The first switch is connected in parallel with the second offset voltage generating module. The second switch is connected in parallel with the first offset voltage generating module. In response to the second control signal being at the third level, the first switch is turned on and the second switch is turned off; In response to the second control signal being at the fourth level, the second switch is turned on and the first switch is turned off.

8. The power-on modulation circuit according to claim 1, characterized in that, The soft-start control voltage is a voltage signal that gradually increases during the power-on process of the voltage conversion circuit.

9. A voltage conversion circuit, characterized in that, Includes the power-on modulation circuit, PWM modulation module, and drive module as described in any one of claims 1-8; The PWM modulation module is used to generate a PWM modulation signal based on the soft-start control voltage and the feedback voltage during the power-on process of the voltage conversion circuit; the drive module is connected to the PWM modulation module and the power-on modulation circuit respectively, and is used to control the conduction and cutoff of the high-side transistor and the freewheeling transistor in the voltage conversion circuit based on the PWM modulation signal and the modulation signal.

10. The voltage conversion circuit according to claim 9, characterized in that, When the modulation signal is at a transition edge, the driving module controls the high-side transistor to turn on; when the PWM modulation signal and the modulation signal are at the same transition edge, the driving module controls the high-side transistor to turn off.

11. An electronic device, characterized in that, Includes the voltage conversion circuit according to any one of claims 9-10.

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