Voltage conversion circuit with built-in ripple injection, chip and equipment

Abstract

The invention relates to a voltage conversion circuit with built-in ripple injection, a chip and equipment. The voltage conversion circuit comprises a square wave generation module, a ripple generation module and a comparison module. The square wave generation module is used for converting the direct current voltage into a voltage square wave signal and outputting the voltage square wave signal to an external voltage stabilization unit; the ripple generation module comprises an integration unit and a filtering unit; the integration unit is used for converting the voltage square wave signal into a voltage triangular wave signal; the filtering unit is used for filtering direct current information in the voltage triangular wave signal and generating a ripple signal; the comparison module is used for generating a comparison voltage signal according to a comparison result of the feedback signal and the reference signal; the comparison voltage signal is used for generating a conduction control signal of the square wave generation module. The high common-mode voltage in the ripple signals is eliminated through the filtering unit, so that the voltage signals received by the comparison module are all low-voltage signals, and therefore, the circuit designed by the invention does not need to be provided with a high-voltage-resistant device, and the size and cost of the circuit are reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of voltage conversion, and in particular to a voltage conversion circuit, chip and device with built-in ripple injection. Background Art

[0002] A ripple generator is usually provided in the voltage conversion circuit to generate voltage ripple. The comparator will collect the voltage ripple and feed back the waveform signal output by the voltage conversion circuit to ensure high-precision output of the voltage conversion circuit.

[0003] The collected voltage ripple has a high common mode voltage. In the prior art, a high voltage resistant device is usually set in the voltage conversion circuit to eliminate the influence of the high common mode voltage. However, due to the large size and high cost of the high voltage resistant device, the area of ​​the voltage conversion circuit is also increased, thereby increasing the cost of the circuit. Therefore, how to eliminate the high common mode voltage in the voltage conversion circuit has become an urgent problem to be solved. Summary of the invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a voltage conversion circuit, chip and device with built-in ripple injection.

[0005] The present disclosure provides a voltage conversion circuit with built-in ripple injection, comprising: a square wave generation module, which is used to convert an input direct current voltage into a voltage square wave signal, and output the voltage square wave signal to an external voltage stabilizing unit; the ripple generation module, which comprises an integration unit and a filtering unit; the integration unit is electrically connected to the square wave generation module and the filtering unit respectively, and the integration unit and the filtering unit are both grounded; the integration unit is used to convert the voltage square wave signal into a voltage triangular wave signal; the filtering unit is used to filter out the direct current information in the voltage triangular wave signal and generate a ripple signal; a comparison module is used to generate a comparison voltage signal according to the comparison result between a feedback signal and a reference signal; wherein the feedback signal is a signal obtained by superimposing the ripple signal and the voltage feedback signal of the external voltage stabilizing unit; the reference signal is a signal obtained by superimposing the valley voltage of the ripple signal and the reference voltage of the comparison module; the comparison voltage signal is used to generate a conduction control signal of the square wave generation module.

[0006] Optionally, the integration unit includes: a first resistor and a first capacitor; the output end of the square wave generation module is grounded through the first resistor and the first capacitor, the first resistor and the first capacitor are electrically connected to a first node, and the first node is used to output a first triangular wave signal; wherein the first triangular wave signal is a signal generated after the voltage square wave signal is integrated by the first resistor and the first capacitor.

[0007] Optionally, the filtering unit includes: a second resistor, a second capacitor and a third capacitor; the first end of the second capacitor is electrically connected to the first node, the second end of the second capacitor is grounded through the second resistor and the third capacitor, and the second capacitor is electrically connected to the second node with the second resistor and the third capacitor; the second node is used to output a second triangular wave signal; wherein the second triangular wave signal is a ripple signal generated after the first triangular wave signal is filtered by the second resistor, the second capacitor and the third capacitor.

[0008] Optionally, the voltage conversion circuit also includes a conduction control unit, the comparison module includes a comparator and a sampling unit; the comparator includes a first collection terminal, a second collection terminal, a third collection terminal and an output terminal; the first collection terminal is electrically connected to the ripple generation module, the second collection terminal is electrically connected to the voltage feedback terminal of the external voltage stabilization unit through a voltage divider circuit, and the third collection terminal is electrically connected to the ripple generation module through the sampling unit; the output terminal is electrically connected to the conduction control unit; wherein the sampling unit is used to collect the valley voltage of the ripple signal, and the conduction control unit is used to generate a conduction control signal according to the comparison voltage signal output by the comparator.

[0009] Optionally, the sampling unit includes: a frequency divider, a first switch, a second switch, a third switch, a fourth switch, a fourth capacitor and a fifth capacitor; the frequency divider is electrically connected to the first switch, the second switch, the third switch and the fourth switch respectively, and the frequency divider is also electrically connected to the square wave generation module, and the frequency divider is used to divide the voltage square wave signal into a first square wave signal and a second square wave signal; the first square wave signal is used to control the conduction or shutoff of the first switch and the fourth switch, and the second square wave signal is used to control the conduction or shutoff of the second switch and the third switch; wherein the first square wave signal and the second square wave signal The signal frequency is half of the voltage square wave signal, and the phase difference between the first square wave signal and the second square wave signal is 180°; the ripple generation module is electrically connected to the third acquisition terminal through the first switch and the second switch, and the ripple generation module is also electrically connected to the third acquisition terminal through the third switch and the fourth switch; the first switch and the second switch are connected in series at the third node, the third switch and the fourth switch are connected in series at the fourth node, the third node is grounded through the fourth capacitor, and the fourth node is grounded through the fifth capacitor; wherein the fourth capacitor and the fifth capacitor are used to collect and store the valley voltage of the ripple signal.

[0010] Optionally, the square wave generation module includes a driving unit, a fifth switch and a sixth switch; the driving unit is electrically connected to the comparison module, the first output end of the driving unit is electrically connected to the control end of the fifth switch, the second output end of the driving unit is electrically connected to the control end of the sixth switch, the first end of the fifth switch is electrically connected to the voltage input end, the second end of the fifth switch and the first end of the sixth switch are both electrically connected to an external voltage stabilizing unit, and the second end of the sixth switch is grounded; wherein the driving unit is used to control the conduction or shutoff of the fifth switch and the sixth switch respectively according to the received conduction control signal; the voltage input end is used to provide a stable high-level voltage.

[0011] Optionally, the fifth switch is a first PMOS tube, and the sixth switch is a second PMOS tube; the first output end of the driving unit is electrically connected to the gate of the first PMOS tube, the second output end of the driving unit is electrically connected to the gate of the second PMOS tube, the first pole of the first PMOS tube is electrically connected to the voltage input end, the second pole of the first PMOS tube and the first pole of the second PMOS tube are both electrically connected to the external voltage stabilizing unit, and the second pole of the second PMOS tube is grounded.

[0012] Optionally, the voltage conversion circuit also includes a conduction control unit, which is connected between the comparison module and the driving unit; the comparison voltage signal includes a first analog signal and a second analog signal, and the conduction control signal includes a first digital drive signal and a second digital drive signal; wherein the driving unit is used to control the conduction of the fifth switch based on the first digital drive signal, and to control the conduction of the sixth switch based on the second digital drive signal; the conduction control unit is used to convert the received first analog signal into a first digital drive signal, or to convert the received second analog signal into a second digital drive signal.

[0013] The present disclosure also provides a voltage conversion chip with built-in ripple injection, comprising any of the voltage conversion circuits with built-in ripple injection as described above.

[0014] The present disclosure also provides a voltage conversion device with built-in ripple injection, including the voltage conversion chip with built-in ripple injection as described above.

[0015] The present disclosure provides a voltage conversion circuit, chip and device with built-in ripple injection, wherein the voltage conversion circuit includes a square wave generation module, a ripple generation module and a comparison module. The ripple generation module includes an integration unit and a filtering unit, wherein the integration unit is used to integrate the voltage square wave signal generated by the square wave generation module, so that the voltage square wave signal is converted into a voltage triangular wave signal, and at this time, there is a high common mode voltage in the voltage triangular wave signal. The comparison module collects the voltage triangular wave signal generated by the integration unit through the filtering unit, and the filtering unit eliminates the DC information of the high voltage in the voltage triangular wave signal with reference to the ground signal, and only retains the triangular wave information of the low voltage in the voltage triangular wave signal, so that the comparison module can collect the ripple signal after the high common mode voltage is eliminated. The comparison module also collects the voltage feedback signal of the external voltage stabilizing unit and the valley voltage of the ripple signal, and obtains the feedback signal and the reference signal by superposition inside the comparison module, wherein the feedback signal is obtained by superposition of the ripple signal and the voltage feedback signal of the external voltage stabilizing unit, and the reference signal is obtained by superposition of the valley voltage of the ripple signal and the reference voltage of the comparison module. The feedback signal obtained by superposition is compared with the reference signal inside the comparison module, and a comparison voltage signal is generated according to the comparison result. The comparison voltage signal can be used to generate a conduction control signal of the square wave generation module. The conduction control signal controls the square wave generation module to convert the input DC voltage into a voltage square wave signal, and outputs it to the external voltage stabilization unit, thereby realizing the conversion of the input DC voltage into a voltage square wave signal, and ensuring the accuracy of the output voltage by ripple injection. The present disclosure eliminates the DC information of the high voltage in the voltage triangle wave signal by the filter unit set in the ripple generation module, thereby eliminating the high common mode voltage in the voltage triangle wave signal to generate a low voltage ripple signal, so that the signals collected by the comparison module are all low voltage signals. Therefore, no high voltage resistant devices are required in the circuit designed by the present disclosure, thereby reducing the volume and cost of the voltage conversion circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of the structure of a voltage conversion circuit with built-in ripple injection provided in an embodiment of the present disclosure.

[0018] Figure 2 A schematic diagram of the structure of another voltage conversion circuit with built-in ripple injection provided in an embodiment of the present disclosure.

[0019] Figure 3A schematic diagram of waveforms of a voltage square wave signal, a first square wave signal, and a second square wave signal provided in an embodiment of the present disclosure.

[0020] Figure 4 A schematic structural diagram of a preferred voltage conversion circuit with built-in ripple injection provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0023] Figure 1 A schematic diagram of a voltage conversion circuit with built-in ripple injection provided by an embodiment of the present disclosure is shown in FIG. Figure 1 As shown, the voltage conversion circuit includes: a square wave generation module 100, a ripple generation module, and a comparison module 300. The square wave generation module 100 is used to convert the input DC voltage into a voltage square wave signal, and output the voltage square wave signal to the external voltage stabilizing unit 400; the ripple generation module includes an integration unit 210 and a filtering unit 220; the integration unit 210 is electrically connected to the square wave generation module 100 and the filtering unit 220 respectively, and the integration unit 210 and the filtering unit 220 are both grounded; the integration unit 210 is used to convert the voltage square wave signal into a voltage triangular wave signal; the filtering unit 220 is used to filter out the DC information in the voltage triangular wave signal and generate a ripple signal; the comparison module 300 is used to generate a comparison voltage signal according to the comparison result of the feedback signal and the reference signal; wherein the feedback signal is a signal obtained by superimposing the ripple signal and the voltage feedback signal of the external voltage stabilizing unit 400; the reference signal is a signal obtained by superimposing the valley voltage of the ripple signal and the reference voltage of the comparison module 300; the comparison voltage signal is used to generate a conduction control signal of the square wave generation module 100.

[0024] Specifically, the input end of the square wave generation module 100 is electrically connected to the power supply module 500, the output end of the square wave generation module 100 is electrically connected to the integration unit 210 and the external voltage stabilizing unit 400 respectively, the integration unit 210 is electrically connected to the filter unit 220, the filter unit 220 is also electrically connected to the first end 301 of the comparison module 300 and the third end 303 of the comparison module 300, the second end 302 of the comparison module 300 is electrically connected to the external voltage stabilizing unit 400, and the output end 304 of the comparison module 300 is electrically connected to the square wave generation module 100. The power supply module 500 is used to output a DC voltage to the square wave generation module 100, and a switch element is provided in the square wave generation module 100, and the on and off of the switch element is controlled according to the conduction control signal, so as to realize the conversion of the input DC voltage into a voltage square wave signal.

[0025] The integration unit 210 is used to integrate the voltage square wave signal generated by the square wave generation module 100, so that the voltage square wave signal is converted into a voltage triangular wave signal, and at this time, there is a high common mode voltage in the voltage triangular wave signal. The comparison module 300 collects the voltage triangular wave signal generated by the integration unit 210 through the filtering unit 220. Because the filtering unit 220 is grounded, the filtering unit 220 eliminates the DC information of the high voltage in the voltage triangular wave signal with reference to the ground signal, and only retains the triangular wave information of the low voltage in the voltage triangular wave signal, so that the first end 301 of the comparison module 300 can collect the ripple signal after the high common mode voltage is eliminated.

[0026] The comparison module 300 also collects the voltage feedback signal of the external voltage stabilizing unit 400 and the valley voltage of the ripple signal. The second end 302 of the comparison module 300 collects the voltage feedback signal provided by the external voltage stabilizing unit 400, and superimposes the ripple signal and the voltage feedback signal inside the comparison module 300 to obtain a feedback signal. The third end 303 of the comparison module 300 collects the valley voltage of the ripple signal, and superimposes the valley voltage of the ripple signal with the reference voltage of the comparison module 300 inside the comparison module 300 to obtain a reference signal. Finally, the feedback signal obtained by superposition is compared with the reference signal inside the comparison module 300, and a comparison voltage signal is generated according to the comparison result. The comparison voltage signal can be used to generate a conduction control signal of the square wave generation module 100. The conduction control signal controls the on and off of the switch element in the square wave generation module 100, and converts the input DC voltage into a voltage square wave signal, thereby realizing the conversion of the input DC voltage into a voltage square wave signal by ripple injection, and ensuring the accuracy of the output voltage. Furthermore, the present invention eliminates the high common-mode voltage in the voltage triangular wave signal by eliminating the DC information of the high voltage in the voltage triangular wave signal through the filtering unit 220 provided in the ripple generation module to generate a low-voltage ripple signal, so that the signals collected by the comparison module 300 are all low-voltage signals. Therefore, there is no need to set high-voltage resistant devices in the circuit designed in the present invention, thereby reducing the volume and cost of the voltage conversion circuit.

[0027] In some embodiments, the integration unit includes: a first resistor and a first capacitor; the output end of the square wave generation module is grounded through the first resistor and the first capacitor, the first resistor and the first capacitor are electrically connected to a first node, and the first node is used to output a first triangular wave signal; wherein the first triangular wave signal is a signal generated after the voltage square wave signal is integrated by the first resistor and the first capacitor.

[0028] Specifically, the voltage square wave signal is transmitted to the first resistor and the first capacitor through the output end of the square wave generation module. Since the capacitor has the property that the voltage will not change suddenly, when the voltage square wave signal is at the rising edge, the voltage square wave signal slowly charges the first capacitor through the first resistor, and when the voltage square wave signal is at the falling edge, the first capacitor slowly discharges. Therefore, the voltage across the first resistor gradually increases at a fixed slope when the voltage square wave signal is at the rising edge, and gradually decreases at a fixed slope when the voltage square wave signal is at the falling edge, so that the signal output at the first node is a triangular wave signal, thereby completing the integration of the voltage square wave signal into a first triangular wave signal through the first resistor and the first capacitor.

[0029] In some embodiments, the filtering unit includes: a second resistor, a second capacitor and a third capacitor; the first end of the second capacitor is electrically connected to the first node, the second end of the second capacitor is grounded through the second resistor and the third capacitor, and the second capacitor is electrically connected to the second node with the second resistor and the third capacitor; the second node is used to output a second triangular wave signal; wherein the second triangular wave signal is a ripple signal generated after the first triangular wave signal is filtered by the second resistor, the second capacitor and the third capacitor.

[0030] Specifically, the second capacitor and the third capacitor couple the first triangular wave signal collected from the first node to the second resistor, and the DC information with high voltage in the first triangular wave is filtered out by the second capacitor and the third capacitor, so that the voltage across the second resistor is a low-voltage second triangular wave signal that only retains the triangular wave information, and finally the second triangular wave signal is output to the comparison module as a ripple signal. In addition, since the second resistor and the third capacitor are both grounded, the second triangular wave signal is a signal generated by the reference ground signal, so the valley voltage of the second triangular wave signal is 0V. The present disclosure eliminates the high-voltage DC information in the first triangular wave signal through the second resistor, the second capacitor and the third capacitor, thereby eliminating the high common-mode voltage in the first triangular wave signal to generate a low-voltage second triangular wave signal, so that the ripple signal collected by the comparison module is a low-voltage signal, so that the circuit designed by the present disclosure does not need to set a high-voltage resistant device for the comparison module, thereby reducing the volume and cost of the voltage conversion circuit.

[0031] In some embodiments, the voltage conversion circuit also includes a conduction control unit, the comparison module includes a comparator and a sampling unit; the comparator includes a first collection terminal, a second collection terminal, a third collection terminal and an output terminal; the first collection terminal is electrically connected to the ripple generation module, the second collection terminal is electrically connected to the voltage feedback terminal of the external voltage stabilization unit through a voltage divider circuit, and the third collection terminal is electrically connected to the ripple generation module through the sampling unit; the output terminal is electrically connected to the conduction control unit; wherein the sampling unit is used to collect the valley voltage of the ripple signal, and the conduction control unit is used to generate a conduction control signal according to the comparison voltage signal output by the comparator.

[0032] Specifically, the first acquisition terminal of the comparator is used to collect the ripple signal generated by the ripple generation module, the second acquisition terminal of the comparator is used to collect the voltage feedback signal provided by the voltage feedback terminal of the external voltage stabilizing unit, and the third acquisition terminal of the comparator collects the valley voltage of the ripple signal through the sampling unit. After collecting the ripple signal and the voltage feedback signal, the comparator superimposes the ripple signal and the voltage feedback signal inside the comparator to obtain a feedback signal. After collecting the valley voltage of the ripple signal, the comparator superimposes the valley voltage of the ripple signal with the reference voltage stored inside the comparator to obtain a reference signal. Finally, the superimposed feedback signal is compared with the reference signal in the comparator, and a comparison voltage signal is generated according to the comparison result. The comparison voltage signal is a voltage signal with alternating high and low levels. The conduction control unit generates a conduction control signal according to the comparison voltage signal, and the square wave generation module controls the switch element set in the square wave generation module to turn on or off according to the conduction control signal, thereby converting the DC voltage input to the square wave generation module into a voltage square wave signal. Therefore, the present disclosure outputs a comparison voltage signal according to the injected ripple signal through the comparator, and the conduction control unit outputs a conduction control signal according to the comparison voltage signal, and controls the square wave generation module to generate a voltage square wave signal from the input DC voltage, thereby realizing the conversion of the input DC voltage into a voltage square wave signal by ripple injection, and ensuring the accuracy of the output voltage. In addition, the first acquisition terminal, the second acquisition terminal, and the third acquisition terminal of the comparator all receive low-voltage signals, so in the circuit designed by the present disclosure, there is no need to set a high-voltage resistant device for the comparator, thereby reducing the volume and cost of the voltage conversion circuit.

[0033] In some embodiments, Figure 2 A schematic diagram of a voltage conversion circuit with built-in ripple injection provided by an embodiment of the present disclosure is shown in FIG. Figure 2 As shown, the sampling unit includes: a frequency divider 321, a first switch 322, a second switch 323, a third switch 324, a fourth switch 325, a fourth capacitor C4 and a fifth capacitor C5.

[0034] The frequency divider 321 is electrically connected to the first switch 322, the second switch 323, the third switch 324 and the fourth switch 325 respectively, and is also electrically connected to the square wave generating module 100. The frequency divider 321 is used to divide the voltage square wave signal into a first square wave signal and a second square wave signal; the first square wave signal is used to control the on or off of the first switch 322 and the fourth switch 325, and the second square wave signal is used to control the on or off of the second switch 323 and the third switch 324; wherein, the signal frequency of the first square wave signal and the second square wave signal is half of that of the voltage square wave signal, and the phase difference between the first square wave signal and the second square wave signal is 180°.

[0035] Specifically, Figure 3A schematic diagram of waveforms of a voltage square wave signal, a first square wave signal, and a second square wave signal provided in an embodiment of the present disclosure, such as Figure 3 As shown, the signal frequency of the first square wave signal V1 and the second square wave signal V2 is half of the voltage square wave signal VSW, and the phase difference between the first square wave signal V1 and the second square wave signal V2 is 180°. While the frequency divider 321 outputs the first square wave signal V1 to the first switch 322 and the fourth switch 325, it also outputs the second square wave signal V2 to the second switch 323 and the third switch 324. The first switch 322, the second switch 323, the third switch 324 and the fourth switch 325 are all turned on based on receiving the first level signal, and are turned off based on receiving the second level signal. Therefore, when the output of the first square wave signal V1 is a first level signal, the output of the second square wave signal V2 is a second level signal; when the output of the first square wave signal V1 is a second level signal, the output of the second square wave signal V2 is a first level signal. Therefore, when the first switch 322 and the fourth switch 325 are turned on, the second switch 323 and the third switch 324 are turned off; when the first switch 322 and the fourth switch 325 are turned off, the second switch 323 and the third switch 324 are turned on.

[0036] The ripple generation module 200 is electrically connected to the third collection terminal 313 of the comparator 310 through the first switch 322 and the second switch 323, and the ripple generation module 200 is also electrically connected to the third collection terminal 313 of the comparator 310 through the third switch 324 and the fourth switch 325; the first switch 322 and the second switch 323 are connected in series to the third node C, the third switch 324 and the fourth switch 325 are connected in series to the fourth node D, the third node C is grounded through the fourth capacitor C4, and the fourth node D is grounded through the fifth capacitor C5; wherein the fourth capacitor C4 and the fifth capacitor C5 are used to collect and store the valley voltage of the ripple signal.

[0037] Specifically, the sampling unit samples the ripple signal generated by the ripple generation module 200. When the first square wave signal output by the frequency divider 321 is a first level signal, the output second square wave signal is a second level signal. At this time, the first switch 322 and the fourth switch 325 are turned on, the second switch 323 and the third switch 324 are turned off, the fourth capacitor C4 is in the sampling stage, and the voltage of the ripple signal is collected, and the fifth capacitor C5 is in the holding stage. In one cycle of the voltage square wave signal, the voltage of the ripple signal first increases and then decreases. Finally, at the end of the cycle of the voltage square wave signal, the voltage of the ripple signal decreases to a valley voltage. At this time, the first square wave signal is switched to the second level signal, the second square wave signal is switched to the first level signal, the first switch 322 and the fourth switch 325 are disconnected, and the second switch 323 and the third switch 324 are turned on, so that the third acquisition terminal 313 of the comparator 310 is electrically connected to the third node C. The voltage at the third node C is the actual voltage of the fourth capacitor C4. Therefore, the third acquisition terminal 313 of the comparator 310 is always collecting the voltage at the third node C during the period when the first switch 322 and the fourth switch 325 are disconnected and the second switch 323 and the third switch 324 are turned on, that is, the valley voltage of the ripple signal is always collected.

[0038] When the first square wave signal output by the frequency divider 321 is a second level signal, the output second square wave signal is a first level signal. At this time, the first switch 322 and the fourth switch 325 are disconnected, the second switch 323 and the third switch 324 are turned on, the fourth capacitor C4 is in the holding stage, and the fifth capacitor C5 is in the sampling stage to collect the voltage of the ripple signal. At the end of the cycle of the voltage square wave signal, the voltage of the ripple signal decreases to the valley voltage. At this time, the first square wave signal is switched to the first level signal, the second square wave signal is switched to the second level signal, the first switch 322 and the fourth switch 325 are turned on, and the second switch 323 and the third switch 324 are turned off, so that the third acquisition terminal 313 of the comparator 310 is electrically connected to the fourth node D. The voltage at the fourth node D is the actual voltage of the fifth capacitor C5. Therefore, the third acquisition terminal 313 of the comparator 310 collects the voltage at the fourth node D during the period when the first switch 322 and the fourth switch 325 are turned on and the second switch 323 and the third switch 324 are turned off, that is, the valley voltage of the ripple signal is always collected, thereby realizing that the sampling unit collects the valley voltage of the ripple signal during the entire sampling period.

[0039] In some embodiments, the square wave generation module includes a driving unit, a fifth switch and a sixth switch; the driving unit is electrically connected to the comparison module, the first output end of the driving unit is electrically connected to the control end of the fifth switch, the second output end of the driving unit is electrically connected to the control end of the sixth switch, the first end of the fifth switch is electrically connected to the voltage input end, the second end of the fifth switch and the first end of the sixth switch are both electrically connected to an external voltage stabilizing unit, and the second end of the sixth switch is grounded; wherein the driving unit is used to control the conduction or shutoff of the fifth switch and the sixth switch respectively according to the received conduction control signal; the voltage input end is used to provide a stable high-level voltage.

[0040] Specifically, after the comparison module outputs the comparison voltage signal, the conduction control unit generates a conduction control signal according to the comparison voltage signal and outputs it to the driving unit, and the driving unit outputs level signals to the fifth switch and the sixth switch respectively according to the conduction control signal, and the fifth switch and the sixth switch are alternately turned on according to the output level signal. When the fifth switch is turned on and the sixth switch is turned off, the voltage input terminal is electrically connected to the external voltage stabilizing unit through the turned-on fifth switch, and during this period, the square wave generation module outputs the high level signal input to the voltage input terminal. When the fifth switch is turned off and the sixth switch is turned on, the external voltage stabilizing unit is grounded through the sixth switch, and during this period, the square wave generation module outputs a low level signal, thereby realizing the conversion of the input DC voltage into a voltage square wave signal with alternating high and low levels.

[0041] In some embodiments, the fifth switch is a first PMOS tube, and the sixth switch is a second PMOS tube; the first output end of the driving unit is electrically connected to the gate of the first PMOS tube, the second output end of the driving unit is electrically connected to the gate of the second PMOS tube, the first pole of the first PMOS tube is electrically connected to the voltage input end, the second pole of the first PMOS tube and the first pole of the second PMOS tube are both electrically connected to the external voltage stabilizing unit, and the second pole of the second PMOS tube is grounded.

[0042] Specifically, the driving unit outputs high and low level signals to the first PMOS tube and the second PMOS tube respectively according to the conduction control signal. When the first output end of the driving unit outputs a low level signal, the second output end of the driving unit outputs a high level signal, the first PMOS tube is turned on, and the second PMOS tube is turned off. At this time, the voltage input end is electrically connected to the external voltage stabilizing unit through the first PMOS tube that is turned on. During this period, the square wave generation module outputs the high level signal input from the voltage input end. When the first output end of the driving unit outputs a high level signal, the second output end of the driving unit outputs a low level signal, the first PMOS tube is turned off, the second PMOS tube is turned on, and the external voltage stabilizing unit is grounded through the second PMOS tube. During this period, the square wave generation module outputs a low level signal, thereby realizing the conversion of the input DC voltage into a voltage square wave signal with alternating high and low levels.

[0043] In some embodiments, the voltage conversion circuit also includes a conduction control unit, which is connected between the comparison module and the driving unit; the comparison voltage signal includes a first analog signal and a second analog signal, and the conduction control signal includes a first digital drive signal and a second digital drive signal; wherein the driving unit is used to control the conduction of the fifth switch based on the first digital drive signal, and to control the conduction of the sixth switch based on the second digital drive signal; the conduction control unit is used to convert the received first analog signal into a first digital drive signal, or to convert the received second analog signal into a second digital drive signal.

[0044] Specifically, the comparison module outputs the first analog signal and the second analog signal respectively according to the comparison result between the feedback signal and the reference signal. When the voltage of the feedback signal is less than the voltage of the reference signal, the comparison module outputs the first analog signal, the conduction control unit converts the received first analog signal into a first digital drive signal, and stores the conduction control time in the conduction control unit. During the conduction control time, the conduction control unit continuously outputs the first digital drive signal to the drive unit, so that within a fixed time, the drive unit controls the fifth switch to be turned on based on the first digital drive signal, and uses the DC voltage input by the power supply module as the high-level signal in the voltage square wave signal, and makes the duration of the high-level signal in the generated voltage square wave signal the same as the conduction control time. When the time when the comparison module outputs the first analog signal is longer than the conduction control time, the fifth switch is turned off, the conduction control unit outputs the second digital drive signal, and controls the drive unit to turn on the sixth switch. In addition, when the voltage of the feedback signal is greater than the voltage of the reference signal, the comparison module outputs the second analog signal, the conduction control unit converts the received second analog signal into a second digital drive signal, and also controls the drive unit to turn on and ground the sixth switch, thereby generating a low-level signal in the voltage square wave signal.

[0045] Figure 4 A schematic diagram of a preferred voltage conversion circuit with built-in ripple injection provided by an embodiment of the present disclosure is shown in FIG. Figure 4 As shown, the voltage conversion circuit includes: a first PMOS transistor Q1, a second PMOS transistor Q2, a driving unit 110, a conduction control unit 600, a comparator 310, a sampling unit 320, a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2 and a third capacitor C3.

[0046] The power supply module 500 is electrically connected to the first electrode of the first PMOS tube Q1, the second electrode of the first PMOS tube Q1 is electrically connected to the first electrode of the second PMOS tube Q2, the second electrode of the second PMOS tube Q2 is grounded, the gate of the first PMOS tube Q1 and the gate of the second PMOS tube Q2 are both electrically connected to the driving unit 110, the first electrode of the second PMOS tube Q2 is electrically connected to the external voltage stabilizing unit 400, the first electrode of the second PMOS tube Q2 is also grounded through the first resistor R1 and the first capacitor C1, the first resistor R1 and the first capacitor C1 are electrically connected to the first node A, the first node A and the first electrode of the second capacitor C2 are electrically connected to the first electrode of the second PMOS tube Q2. The second end of the second capacitor C2 is electrically connected to the ground through the second resistor R2 and the third capacitor C3, the second capacitor C2, the second resistor R2 and the third capacitor C3 are electrically connected to the second node B, the second node B is electrically connected to the first acquisition terminal 311 of the comparator 310, the second node B is also electrically connected to the third acquisition terminal 313 of the comparator 310 through the sampling unit 320, the second acquisition terminal 312 of the comparator 310 is electrically connected to the voltage feedback terminal 401 of the external voltage stabilizing unit 400, the output terminal 314 of the comparator 310 is electrically connected to the conduction control unit 600, and the conduction control unit 600 is electrically connected to the driving unit 110.

[0047] Specifically, a slow start unit is also provided in the voltage conversion circuit, and an initial voltage square wave signal is provided to the external voltage stabilizing unit 400 through the slow start unit, and the voltage square wave signal is integrated through the first resistor R1 and the first capacitor C1 to be converted into a first triangular wave signal. The second capacitor C2 and the third capacitor C3 couple the first triangular wave signal collected from the first node A to the second resistor R2, and the DC information with high voltage in the first triangular wave is filtered out through the second capacitor C2 and the third capacitor C3, so that the voltage across the second resistor R2 is a low voltage second triangular wave signal that only retains the triangular wave information, and finally the second triangular wave signal is output as a ripple signal to the comparator 310. In addition, since the second resistor R2 and the third capacitor C3 are both grounded, the second triangular wave signal is a signal generated by the reference ground signal, so the valley voltage of the second triangular wave signal is 0V.

[0048] The first acquisition terminal 311 of the comparator 310 acquires the ripple signal, the second acquisition terminal 312 of the comparator 310 acquires the voltage feedback signal provided by the voltage feedback terminal 401 of the external voltage stabilizing unit 400, and the third acquisition terminal 313 of the comparator 310 acquires the valley voltage of the ripple signal through the sampling unit 320. After acquiring the ripple signal and the voltage feedback signal, the comparator 310 superimposes the ripple signal and the voltage feedback signal inside the comparator to obtain a feedback signal. After acquiring the valley voltage of the ripple signal, the comparator 310 superimposes the valley voltage of the ripple signal with the reference voltage stored inside the comparator to obtain a reference signal. Finally, the superimposed feedback signal is compared with the reference signal in the comparator 310. When the feedback signal is less than the reference signal, the output terminal 314 of the comparator 310 outputs a high-level first analog signal. When the feedback signal is greater than the reference signal, the output terminal 314 of the comparator 310 outputs a low-level second analog signal.

[0049] When the output terminal 314 of the comparator 310 outputs the first analog signal, the conduction control unit 600 converts the received first analog signal into a first digital drive signal, and stores the conduction control time in the conduction control unit 600. During the conduction control time, the conduction control unit 600 continuously outputs the first digital drive signal to the drive unit 110, so that within a fixed time, the drive unit 110 controls the first PMOS tube Q1 to be turned on based on the first digital drive signal, uses the DC voltage input by the power supply module 500 as the high-level signal in the voltage square wave signal, and makes the duration of the high-level signal in the generated voltage square wave signal the same as the conduction control time. When the time when the comparator 310 outputs the first analog signal is longer than the conduction control time, the first PMOS tube Q1 is turned off, and the conduction control unit 600 outputs the second digital drive signal to control the drive unit 110 to turn on the second PMOS tube Q2. When the output terminal 314 of the comparator 310 outputs the second analog signal, the conduction control unit 600 converts the received second analog signal into a second digital drive signal, and similarly controls the drive unit 110 to conduct and ground the second PMOS tube Q2, thereby generating a low-level signal in the voltage square wave signal. The present disclosure eliminates the DC information of the high voltage in the voltage triangle wave signal by setting the second resistor R2, the second capacitor C2, and the third capacitor C3, thereby eliminating the high common-mode voltage in the voltage triangle wave signal to generate a low-voltage ripple signal, so that the signals collected by the three collection terminals of the comparator 310 are all low-voltage signals. Therefore, in the circuit designed by the present disclosure, there is no need to set a high-voltage resistant device for the comparator 310, thereby reducing the volume and cost of the voltage conversion circuit.

[0050] In some embodiments, see Figure 4 , Figure 4The corresponding loop transfer function of the circuit is:

[0051] Among them, G open (s) represents a transfer function between an input signal of the second acquisition terminal 312 of the comparator 310 and an output signal of the output terminal 314 of the comparator 310; G dv (s) represents the transfer function between the output signal of the output terminal 314 of the comparator 310 and the input signal of the external voltage stabilizing unit 400; Hcomp(s) represents the transfer function of the comparator 310, H d (s) represents the transfer function of the conduction control unit 600 .

[0052] G dv The expression of (s):

[0053] Among them, V in Indicates the voltage output by the power supply module 500, Indicates the compensation zero point of the ceramic capacitor provided in the conduction control unit 600; represents the resonance damping factor of the conduction control unit 600, represents the resonant angular frequency of the conduction control unit 600.

[0054] The expressions of G1(s) and G2(s) are:

[0055] Substituting G1(s) and G2(s) into the loop transfer function and simplifying it, we can get the transfer function:

[0056] Wherein, G1(s) represents the transfer function between the signal output by the second node B and the input signal of the first acquisition terminal 311 of the comparator 300; G2(s) represents the transfer function between the signal output by the second node B and the third acquisition terminal 313 of the comparator 300. f represents the resistance value of the first resistor R1, R b represents the resistance value of the second resistor R2, R bt represents the resistance value of the first voltage-dividing resistor (not shown in the figure) connected to the voltage feedback terminal 401 of the external voltage-stabilizing unit 400, R up Indicates the resistance value of the second voltage-dividing resistor (not shown) connected between the voltage feedback terminal 401 of the external voltage-stabilizing unit 400 and the power supply module 400. f represents the capacitance value of the first capacitor C1, C b represents the capacitance value of the second capacitor C2, Cff represents the capacitance value of the feedforward capacitor (not shown) connected in parallel with the second voltage divider resistor, C p Represents the capacitance value of the parasitic capacitance between the connection node between the first resistor R1 and the second PMOS transistor Q2 and the reference ground.

[0057] From the transfer function formula, we can see that the pole of the origin obtained by the integration unit is R f C f compensation, while R b C b The parasitic capacitance of the high voltage resistor causes R f C p Therefore, the ripple generation module provided by the present disclosure can provide additional double zero points to compensate for the LC double poles of the power stage.

[0058] An embodiment of the present disclosure further provides a voltage conversion chip with built-in ripple injection, comprising any one of the above voltage conversion circuits with built-in ripple injection.

[0059] It can be understood that the voltage conversion chip with built-in ripple injection provided in the embodiment of the present disclosure can achieve the corresponding beneficial effects of any of the voltage conversion circuits with built-in ripple injection provided in the above-mentioned embodiments, which will not be elaborated here.

[0060] The embodiment of the present disclosure further provides a voltage conversion device with built-in ripple injection, including the voltage conversion chip with built-in ripple injection as described above.

[0061] It can be understood that the voltage conversion device with built-in ripple injection provided in the embodiment of the present disclosure can achieve the corresponding beneficial effects of the voltage conversion chip with built-in ripple injection provided in the above-mentioned implementation mode, which will not be elaborated here.

[0062] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0063] The above are only specific embodiments of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A voltage conversion circuit with built-in ripple injection, characterized in that: include: A square wave generating module, used for converting an input DC voltage into a voltage square wave signal, and outputting the voltage square wave signal to an external voltage stabilizing unit; The ripple generating module comprises an integrating unit and a filtering unit; the integrating unit is electrically connected to the square wave generating module and the filtering unit respectively, and the integrating unit and the filtering unit are both grounded; the integrating unit is used to transform the voltage square wave signal into a voltage triangular wave signal; the filtering unit is used to filter out the DC information in the voltage triangular wave signal to generate a ripple signal; A comparison module is used to generate a comparison voltage signal according to the comparison result of the feedback signal and the reference signal; wherein the feedback signal is a signal obtained by superimposing the ripple signal and the voltage feedback signal of the external voltage stabilizing unit; the reference signal is a signal obtained by superimposing the valley voltage of the ripple signal and the reference voltage of the comparison module; the comparison voltage signal is used to generate a conduction control signal of the square wave generation module.

2. The voltage conversion circuit with built-in ripple injection according to claim 1, characterized in that: The integration unit includes: a first resistor and a first capacitor; The output end of the square wave generating module is grounded through the first resistor and the first capacitor, the first resistor and the first capacitor are electrically connected to a first node, and the first node is used to output a first triangular wave signal; The first triangular wave signal is a signal generated after the voltage square wave signal is integrated by the first resistor and the first capacitor.

3. The voltage conversion circuit with built-in ripple injection according to claim 2, characterized in that: The filtering unit includes: a second resistor, a second capacitor and a third capacitor; The first end of the second capacitor is electrically connected to the first node, the second end of the second capacitor is grounded through the second resistor and the third capacitor, and the second capacitor, the second resistor and the third capacitor are electrically connected to a second node; the second node is used to output a second triangular wave signal; The second triangular wave signal is a ripple signal generated after the first triangular wave signal is filtered by the second resistor, the second capacitor and the third capacitor.

4. The voltage conversion circuit with built-in ripple injection according to claim 1, characterized in that: The voltage conversion circuit further includes a conduction control unit, and the comparison module includes a comparator and a sampling unit; The comparator comprises a first acquisition terminal, a second acquisition terminal, a third acquisition terminal and an output terminal; The first acquisition terminal is electrically connected to the ripple generation module, the second acquisition terminal is electrically connected to the voltage feedback terminal of the external voltage stabilization unit through a voltage divider circuit, and the third acquisition terminal is electrically connected to the ripple generation module through the sampling unit; the output terminal is electrically connected to the conduction control unit; The sampling unit is used to collect the valley voltage of the ripple signal, and the conduction control unit is used to generate the conduction control signal according to the comparison voltage signal output by the comparator.

5. The voltage conversion circuit with built-in ripple injection according to claim 4, characterized in that: The sampling unit includes: a frequency divider, a first switch, a second switch, a third switch, a fourth switch, a fourth capacitor and a fifth capacitor; The frequency divider is electrically connected to the first switch, the second switch, the third switch and the fourth switch respectively, and is also electrically connected to the square wave generating module, and is used to divide the voltage square wave signal into a first square wave signal and a second square wave signal; the first square wave signal is used to control the on or off of the first switch and the fourth switch, and the second square wave signal is used to control the on or off of the second switch and the third switch; wherein the signal frequencies of the first square wave signal and the second square wave signal are half of the voltage square wave signal, and the phase difference between the first square wave signal and the second square wave signal is 180°; The ripple generation module is electrically connected to the third collection end through the first switch and the second switch, and the ripple generation module is also electrically connected to the third collection end through the third switch and the fourth switch; the first switch and the second switch are connected in series at a third node, the third switch and the fourth switch are connected in series at a fourth node, the third node is grounded through the fourth capacitor, and the fourth node is grounded through the fifth capacitor; wherein the fourth capacitor and the fifth capacitor are used to collect and store the valley voltage of the ripple signal.

6. The voltage conversion circuit with built-in ripple injection according to claim 1, characterized in that: The square wave generating module comprises a driving unit, a fifth switch and a sixth switch; The driving unit is electrically connected to the comparison module, the first output end of the driving unit is electrically connected to the control end of the fifth switch, the second output end of the driving unit is electrically connected to the control end of the sixth switch, the first end of the fifth switch is electrically connected to the voltage input end, the second end of the fifth switch and the first end of the sixth switch are both electrically connected to the external voltage stabilizing unit, and the second end of the sixth switch is grounded; The driving unit is used to control the on or off of the fifth switch and the sixth switch respectively according to the received on control signal; and the voltage input terminal is used to provide a stable high-level voltage.

7. The voltage conversion circuit with built-in ripple injection according to claim 6, characterized in that: The fifth switch is a first PMOS tube, and the sixth switch is a second PMOS tube; The first output end of the driving unit is electrically connected to the gate of the first PMOS tube, the second output end of the driving unit is electrically connected to the gate of the second PMOS tube, the first electrode of the first PMOS tube is electrically connected to the voltage input end, the second electrode of the first PMOS tube and the first electrode of the second PMOS tube are both electrically connected to the external voltage stabilizing unit, and the second electrode of the second PMOS tube is grounded.

8. The voltage conversion circuit with built-in ripple injection according to claim 6, characterized in that: The voltage conversion circuit further includes a conduction control unit, wherein the conduction control unit is connected between the comparison module and the driving unit; The comparison voltage signal includes a first analog signal and a second analog signal, and the conduction control signal includes a first digital drive signal and a second digital drive signal; wherein the driving unit is used to control the conduction of the fifth switch based on the first digital drive signal, and to control the conduction of the sixth switch based on the second digital drive signal; The conduction control unit is used to convert the received first analog signal into a first digital driving signal, or to convert the received second analog signal into a second digital driving signal.

9. A voltage conversion chip with built-in ripple injection, characterized in that: A voltage conversion circuit comprising a built-in ripple injection circuit as described in any one of claims 1-8.

10. A voltage conversion device with built-in ripple injection, characterized in that: Comprising a voltage conversion chip with built-in ripple injection as claimed in claim 9.

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