Voltage regulating chip and switching power supply

Abstract

The utility model discloses a voltage regulating chip and a switching power supply. The voltage regulating chip comprises a voltage input end, a first driving module, a second driving module and a main control module, the voltage input end is used for accessing an input voltage. The first driving module is used for generating and outputting a first driving signal based on an input voltage. The second driving module is used for generating and outputting a second driving signal based on the input voltage. The first driving signal and the second driving signal are used for driving the corresponding voltage regulating circuits respectively. The main control module is used for controlling the first driving module and the second driving module to output a first driving signal and a second driving signal respectively. The first driving module and the second driving module are integrated in the voltage regulating chip, so that the requirement on a peripheral circuit can be reduced, and the electromagnetic interference of the whole circuit to the outside can be reduced.

Description

Technical Field

[0001] The present application belongs to the field of power supply technology, and in particular relates to a voltage regulating chip and a switching power supply. Background Art

[0002] With the development of basic materials, continuous advancements in integrated circuit technology, and semiconductor processes, demands for the size and functionality of electronic devices are increasing. The widespread adoption of electronic devices, such as wearables and portable devices, has placed higher demands on power management chips. Switching power supplies, with their advantages of small size, light weight, high efficiency, and minimal peripheral components, are widely used. However, with the stringent requirements of emerging application scenarios and fierce market competition, traditional switching power supplies are becoming increasingly inadequate. In particular, the complex peripheral circuits of traditional switching power supply chips often suffer from excessive electromagnetic interference. Utility Model Content

[0003] The purpose of this application is to provide a voltage regulating chip and a switching power supply, aiming to solve the problem of excessive electromagnetic interference commonly found in the complex peripheral circuits of traditional switching power supply chips.

[0004] A first aspect of an embodiment of the present application provides a voltage regulating chip, comprising: a voltage input terminal for receiving an input voltage; a first driving module, the first driving module being used to generate and output a first driving signal based on the input voltage; a second driving module, the second driving module being used to generate and output a second driving signal based on the input voltage; the first driving signal and the second driving signal being used to respectively drive corresponding voltage regulating circuits; and a main control module, the main control module being used to control the first driving module and the second driving module to respectively output the first driving signal and the second driving signal.

[0005] In one embodiment, the phase difference between the first driving signal and the second driving signal is 180°.

[0006] In one embodiment, the voltage regulating circuit is a synchronous DC voltage regulating circuit.

[0007] In one embodiment, the voltage regulating circuit includes a high-side switch tube, a low-side switch tube and a first capacitor, the output end of the high-side switch tube being connected to the input end of the low-side switch tube and the first end of the first capacitor, respectively; the first driving module includes a first bootstrap voltage end, a second bootstrap voltage end, a first driving unit, and a second driving unit; the first bootstrap voltage end is connected to the voltage input end, the first bootstrap voltage end is used to be connected to the second end of the first capacitor, the second bootstrap voltage end is connected to the ground end of the first driving unit, and the second bootstrap voltage end is used to be connected to the first end of the first capacitor; the input end of the first driving unit is connected to the main control module, and the output end of the first driving unit is used to be connected to the control end of the high-side switch tube; the input end of the second driving unit is connected to the main control module, and the output end of the second driving unit is used to be connected to the control end of the low-side switch tube; the main control module is used to control the first driving unit and the second driving unit to generate and output the first driving signal based on the input voltage; the circuit of the second driving module is the same as that of the first driving module.

[0008] In one embodiment, the device further includes a voltage stabilizing unit connected between the voltage input terminal and the first driving module and the second driving module, and configured to stabilize the input voltage.

[0009] In one embodiment, a protection unit is further included. The protection unit is connected between the voltage input terminal and the first driving module and the second driving module. The protection unit is used for overvoltage protection.

[0010] A second aspect of the embodiments of the present application provides a switching power supply, comprising the voltage regulating chip as described above and a plurality of voltage regulating circuits, wherein the voltage regulating chip is connected to each of the voltage regulating circuits.

[0011] In one embodiment, several of the voltage regulating circuits include a first step-down circuit and a second step-down circuit; the first step-down circuit is connected to the first driving module of the voltage regulating chip, and the first step-down circuit is used to output a first output voltage based on the input voltage and according to a first driving signal output by the first driving module; the second step-down circuit is connected to the second driving module of the voltage regulating chip, and the second step-down circuit is used to output a second output voltage based on the input voltage and according to a second driving signal output by the second driving module.

[0012] In one embodiment, the output end of the first step-down circuit is connected to the output end of the second step-down circuit.

[0013] In one embodiment, several of the voltage regulating circuits include an H-bridge voltage regulating circuit; the H-bridge voltage regulating circuit is respectively connected to the first driving module and the second driving module of the voltage regulating chip, and the H-bridge voltage regulating circuit is used to output a third output voltage based on the input voltage according to the first driving signal output by the first driving module and the second driving signal output by the second driving module.

[0014] Compared with the prior art, the embodiments of the present application have the following advantages: by integrating the first driving module and the second driving module into one chip, the demand for peripheral circuits can be reduced, and the electromagnetic interference of the overall circuit to the outside world can be reduced.

[0015] At the same time, by setting the phase difference between the first drive signal and the second drive signal to 180°, the magnetic fields generated by the two corresponding voltage regulating circuits can cancel each other out, further reducing the electromagnetic interference of the entire circuit to the outside world. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a voltage regulator chip provided in one embodiment of the present application;

[0017] Figure 2 A circuit diagram of a voltage regulating chip and a voltage regulating circuit provided in one embodiment of the present application;

[0018] Figure 3 A schematic diagram of a switching power supply provided in one embodiment of the present application;

[0019] Figure 4 A circuit diagram of a switching power supply provided in one embodiment of the present application;

[0020] Figure 5 Another circuit diagram of a switching power supply provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0022] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0024] Figure 1 A schematic diagram of a voltage regulator chip provided in an embodiment of the present application is shown. For ease of explanation, only the portion related to this embodiment is shown, which is described in detail as follows:

[0025] The voltage regulating chip 10 includes: a voltage input terminal VIN, a first driving module 100 , a second driving module 200 and a main control module 300 .

[0026] The voltage input terminal VIN is used to receive an input voltage. The first driver module 100 is used to generate and output a first drive signal based on the input voltage. The second driver module 200 is used to generate and output a second drive signal based on the input voltage. The first drive signal and the second drive signal are used to drive corresponding voltage regulation circuits, respectively. The main control module 300 is used to control the first driver module 100 and the second driver module 200 to output the first drive signal and the second drive signal, respectively.

[0027] By integrating the first driving module 100 and the second driving module 200 in one voltage regulating chip 10 , the demand for peripheral circuits can be reduced, and the electromagnetic interference of the entire circuit to the outside world can be reduced.

[0028] The main control module 300 can also receive an input voltage and use the input voltage as its operating voltage. The main control module 300 may include a logic control module such as a Field Programmable Gate Array (FPGA) or an integrated circuit. The first driver module 100 and the second driver module 200 may specifically include drivers configured to output corresponding drive signals based on the voltages at the operating voltage terminal and the ground terminal under the control of the main control module 300.

[0029] In one embodiment, the phase difference between the first driving signal and the second driving signal is 180°.

[0030] By setting the phase difference between the first drive signal and the second drive signal to 180°, the magnetic fields generated by the two corresponding voltage regulating circuits can cancel each other out, further reducing the electromagnetic interference of the entire circuit to the outside world.

[0031] It is understandable that when there are multiple voltage regulating circuits, the PCB layout of the voltage regulating circuits can be adaptively adjusted so that the magnetic fields generated by the multiple voltage regulating circuits cancel each other out.

[0032] In one embodiment, the voltage regulating circuit is a synchronous DC voltage regulating circuit.

[0033] A synchronous DC voltage regulator circuit requires at least two switching tubes. By controlling the on and off of the two switching tubes, voltage regulation can be achieved. A synchronous DC voltage regulator circuit usually uses two MOS tubes. The MOS tube has a lower on-resistance and can output electrical energy more efficiently.

[0034] In one embodiment, if Figure 2 As shown, the voltage regulation circuit includes a high-side switch, a low-side switch, and a first capacitor C1. The output end of the high-side switch is connected to the input end of the low-side switch and the first end of the first capacitor C1, respectively. The high-side switch and the low-side switch can both be N-type MOS transistors.

[0035] It should be noted that Figure 2 The two voltage regulating circuits shown are a first buck circuit 21 and a second buck circuit 22. Taking the first buck circuit 21 as an example, the high-side switch tube and the low-side switch tube of the first buck circuit 21 are a first switch tube Q1 and a second switch tube Q2 respectively.

[0036] The first driving module 100 includes a first bootstrap voltage terminal BST1 , a second bootstrap voltage terminal SW1 , a first driving unit U1 , and a second driving unit U2 .

[0037] The first bootstrap voltage terminal BST1 is connected to the voltage input terminal VIN and is configured to be connected to the second terminal of the first capacitor C1. The second bootstrap voltage terminal SW1 is connected to the ground terminal of the first driver unit U1 and is configured to be connected to the first terminal of the first capacitor C1. The input terminal of the first driver unit U1 is connected to the main control module 300, and the output terminal of the first driver unit U1 is configured to be connected to the control terminal of the high-side switch. The input terminal of the second driver unit U2 is connected to the main control module 300, and the output terminal of the second driver unit U2 is configured to be connected to the control terminal of the low-side switch. The main control module 300 is configured to control the first and second driver units U1 and U2 to generate and output a first drive signal based on the input voltage. The circuitry of the second driver module 200 is identical to that of the first driver module 100.

[0038] The first driver unit U1 and the second driver unit U2 can control the on and off of the high-side switch and the low-side switch, respectively. By controlling the ratio between the on-time and off-time of the high-side switch and the low-side switch, the voltage output by the voltage regulator circuit can be adjusted. The first driver unit U1 and the second driver unit U2 may include a controller, an operational amplifier unit, or an integrated circuit.

[0039] It should be noted that, in order to turn on the high-side switch tube, after stabilizing the voltage of the second bootstrap voltage terminal SW1 through the first capacitor C1, the second bootstrap voltage terminal SW1 is connected to the ground terminal of the first drive unit U1, so that the first drive unit U1 can output a sufficiently high voltage to drive the high-side switch tube to turn on.

[0040] In some embodiments, the first driving module 100 further includes a first diode D1 connected between the operating voltage terminal VCC and the voltage input terminal VIN of the first driving unit U1 to achieve unidirectional transmission of the input voltage to the first driving module 100 .

[0041] In one embodiment, if Figure 2 As shown, the voltage regulating chip 10 further includes a voltage stabilizing unit 400 . The voltage stabilizing unit 400 is connected between the voltage input terminal VIN and the first driving module 100 and the second driving module 200 . The voltage stabilizing unit 400 is used to stabilize the input voltage.

[0042] By stabilizing the input voltage through the voltage stabilizing unit 400 , the first driving module 100 and the second driving module 200 can work more stably, thereby improving the stability of the entire circuit.

[0043] The voltage stabilizing unit 400 may specifically include a regulator.

[0044] In some embodiments, the voltage regulating chip 10 further includes a working voltage terminal VCC, which is connected to the output terminal of the voltage stabilizing unit 400. It can be understood that the input voltage stabilized by the voltage stabilizing unit 400 can be used as the working voltage, and the working voltage is obtained by connecting to the working voltage terminal VCC.

[0045] The operating voltage terminal VCC can also be connected to the high-side switch tube of the voltage regulation circuit to provide an operating voltage.

[0046] In some embodiments, the voltage stabilizing unit 400 may also be connected to the main control module 300 to provide an input voltage to the main control module 300 .

[0047] In one embodiment, if Figure 2 As shown, the voltage regulating chip 10 further includes a protection unit 500 . The protection unit 500 is connected between the voltage input terminal VIN and the first driving module 100 and the second driving module 200 . The protection unit 500 is used for overvoltage protection.

[0048] The protection unit 500 can protect the voltage regulator chip 10 and can be turned on when the input voltage is too high, so that the voltage input terminal VIN is grounded to achieve overvoltage protection or electrostatic protection.

[0049] In some embodiments, the protection unit 500 includes a voltage stabilizing diode ESD, wherein an anode of the voltage stabilizing diode ESD is grounded, and a cathode of the voltage stabilizing diode ESD is connected to the operating voltage terminal VCC.

[0050] In one embodiment, if Figure 2 As shown, the voltage regulating chip 10 further includes an oscillator 600 , which is connected to the main control module 300 and is used to provide a clock signal.

[0051] Figure 3 A schematic diagram of a switching power supply provided in an embodiment of the present application is shown. For ease of explanation, only the portion related to this embodiment is shown, which is described in detail as follows:

[0052] The switching power supply 30 includes a voltage regulating chip 10 and a plurality of voltage regulating circuits 20 as described in any of the above embodiments. The voltage regulating chip 10 is connected to each of the voltage regulating circuits 20 .

[0053] By controlling the power output of multiple voltage regulating circuits 20 through one voltage regulating chip 10 , the number and complexity of components in related peripheral circuits can be reduced, thereby reducing electromagnetic radiation and reducing external interference.

[0054] In one embodiment, if Figure 2 As shown, the plurality of voltage regulating circuits 20 include a first step-down circuit 21 and a second step-down circuit 22. The first step-down circuit 21 is connected to the first driver module 100 of the voltage regulating chip 10. The first step-down circuit 21 is configured to output a first output voltage VOUT1 based on an input voltage and a first drive signal output by the first driver module 100. The second step-down circuit 22 is connected to the second driver module 200 of the voltage regulating chip 10. The second step-down circuit 22 is configured to output a second output voltage VOUT2 based on an input voltage and a second drive signal output by the second driver module 200.

[0055] The first step-down circuit 21 and the second step-down circuit 22 may be step-down circuits with the same circuit structure.

[0056] Taking the first step-down circuit 21 as an example, in some embodiments, as Figure 2 As shown, the first step-down circuit 21 includes a first switch tube Q1, a second switch tube Q2, a first inductor L1, a first capacitor C1, a second capacitor C2 and a third capacitor C3.

[0057] A first end of the first switch tube Q1 is connected to the operating voltage terminal VCC, a second end of the first switch tube Q1 is respectively connected to the first end of the second switch tube Q2, the first end of the first capacitor C1, the second bootstrap voltage terminal SW1 of the first driving module 100, and the first end of the first inductor L1, and a control end of the first switch tube Q1 is connected to the output end of the first driving unit U1 of the first driving module 100.

[0058] A second end of the second switch tube Q2 is grounded, a control end of the second switch tube Q2 is connected to the output end of the second drive unit U2 of the first drive module 100, a second end of the first capacitor C1 is connected to the first bootstrap voltage terminal BST1 of the first drive module 100, and a second end of the first inductor L1 is the output end of the first buck circuit 21.

[0059] The first end of the second capacitor C2 is connected to the first end of the first switch Q1, and the second end of the second capacitor C2 is grounded. The first end of the third capacitor C3 is connected to the second end of the first inductor L1, and the second end of the third capacitor C3 is grounded.

[0060] The first switch tube Q1 and the second switch tube Q2 are both N-type MOS tubes.

[0061] It can be understood that by controlling the on and off of the first switch tube Q1 and the second switch tube Q2 through the first driving signal, the first output voltage VOUT1 can be generated and output based on the input voltage provided by the voltage input terminal VIN.

[0062] It is understandable that the difference between the second buck circuit 22 and the first buck circuit 21 is that the control terminals of the two switching tubes of the second buck circuit 22 are respectively connected to the second driving module 200 to output the second output voltage VOUT2 according to the second driving signal.

[0063] In one embodiment, if Figure 4 As shown, the output end of the first step-down circuit 21 is connected to the output end of the second step-down circuit 22 .

[0064] By connecting the output terminals of the two buck circuits together, a dual-path parallel interleaved output can be achieved, and the first buck circuit 21 and the second buck circuit 22 can also be connected in parallel to achieve current sharing. At this time, the first output voltage VOUT1 is equal to the second output voltage VOUT2.

[0065] When the phase difference between the first drive signal and the second drive signal is 180°, the two inductor current ripples generated by the first buck circuit 21 and the second buck circuit 22 can offset each other, and only a smaller capacitor is needed to meet the demand for small ripples, while improving the dynamic response.

[0066] After a reasonable PCB layout, magnetic field cancellation can be achieved to reduce external interference, making it easier to pass electromagnetic radiation certification tests.

[0067] In one embodiment, if Figure 5As shown, the plurality of voltage regulating circuits 20 include an H-bridge voltage regulating circuit 23. The H-bridge voltage regulating circuit 23 is connected to the first driving module 100 and the second driving module 200 of the voltage regulating chip 10, respectively. The H-bridge voltage regulating circuit 23 is configured to output a third output voltage VOUT3 based on the input voltage, the first driving signal output by the first driving module 100, and the second driving signal output by the second driving module 200.

[0068] For example, in some embodiments, the H-bridge voltage regulating circuit 23 includes a third switch tube Q5, a fourth switch tube Q6, a fifth switch tube Q7, a sixth switch tube Q8, a fourth capacitor C7, a fifth capacitor C8, a sixth capacitor C9, a seventh capacitor C10 and a second inductor L3.

[0069] A first end of the third switch tube Q5 is connected to the voltage input terminal VIN. A second end of the third switch tube Q5 is respectively connected to the first end of the fourth switch tube Q6, the first end of the fourth capacitor C7, the second bootstrap voltage terminal SW1 of the first driving module 100, and the first end of the second inductor L3. A control end of the third switch tube Q5 is connected to the output end of the first driving unit U1 of the first driving module 100.

[0070] A second terminal of the fourth switch tube Q6 is grounded, a control terminal of the fourth switch tube Q6 is connected to the output terminal of the second drive unit U2 of the first drive module 100 , and a second terminal of the fourth capacitor C7 is connected to the first bootstrap voltage terminal BST1 of the first drive module 100 .

[0071] A first end of the fifth capacitor C8 is connected to the first end of the third switch tube Q5 , and a second end of the fifth capacitor C8 is grounded.

[0072] A first end of the fifth switch tube Q7 is connected to the output end of the H-bridge voltage regulator circuit 23. A second end of the fifth switch tube Q7 is respectively connected to the first end of the sixth switch tube Q8, the first end of the sixth capacitor C9, the fourth bootstrap voltage terminal SW2 of the second driver module 200, and the second end of the second inductor L3. A control end of the fifth switch tube Q7 is connected to the output end of the third driver unit U3 of the second driver module 200.

[0073] A second terminal of the sixth switch Q8 is grounded, a control terminal of the sixth switch Q8 is connected to the output terminal of the fourth drive unit U4 of the second drive module 200 , and a second terminal of the sixth capacitor C9 is connected to the third bootstrap voltage terminal BST2 of the second drive module 200 .

[0074] At this point, the switching power supply 30 can achieve output voltages higher than, equal to, or lower than the input voltage. This allows the system to smoothly switch between boost, buck, and buck-boost states, ensuring the stability and reliability of the switching power supply 30. Furthermore, the switching power supply 30 can employ frequency jittering technology, making it easier to pass electromagnetic radiation certification tests. The H-bridge voltage regulator circuit 23 can be applied to Type-C charging scenarios.

[0075] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0076] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0077] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A voltage regulating chip, characterized in that: include: Voltage input terminal, used to access input voltage; a first driving module, configured to generate and output a first driving signal based on the input voltage; a second driving module, configured to generate and output a second driving signal based on the input voltage; The first driving signal and the second driving signal are used to drive corresponding voltage regulating circuits respectively; A main control module is used to control the first driving module and the second driving module to output the first driving signal and the second driving signal respectively.

2. The voltage regulating chip according to claim 1, wherein: The phase difference between the first driving signal and the second driving signal is 180°.

3. The voltage regulating chip according to claim 1, wherein: The voltage regulating circuit is a synchronous DC voltage regulating circuit.

4. The voltage regulating chip according to claim 3, wherein: The voltage regulating circuit includes a high-side switch tube, a low-side switch tube and a first capacitor, wherein the output end of the high-side switch tube is connected to the input end of the low-side switch tube and the first end of the first capacitor respectively; The first driving module includes a first bootstrap voltage terminal, a second bootstrap voltage terminal, a first driving unit and a second driving unit; The first bootstrap voltage terminal is connected to the voltage input terminal, the first bootstrap voltage terminal is used to be connected to the second terminal of the first capacitor, the second bootstrap voltage terminal is connected to the ground terminal of the first driving unit, and the second bootstrap voltage terminal is used to be connected to the first terminal of the first capacitor; The input end of the first driving unit is connected to the main control module, and the output end of the first driving unit is used to connect to the control end of the high-side switch tube; the input end of the second driving unit is connected to the main control module, and the output end of the second driving unit is used to connect to the control end of the low-side switch tube; The main control module is used to control the first driving unit and the second driving unit to generate and output the first driving signal based on the input voltage; The circuit of the second driving module is the same as that of the first driving module.

5. The voltage regulating chip according to any one of claims 1 to 4, characterized in that: It also includes a voltage stabilizing unit connected between the voltage input terminal and the first driving module and the second driving module, and is used to stabilize the input voltage.

6. The voltage regulating chip according to any one of claims 1 to 4, characterized in that: The system further includes a protection unit connected between the voltage input terminal and the first driving module and the second driving module, and is used for overvoltage protection.

7. A switching power supply, characterized in that: It comprises the voltage regulating chip according to any one of claims 1 to 6 and a plurality of voltage regulating circuits, wherein the voltage regulating chip is connected to each of the voltage regulating circuits.

8. The switching power supply according to claim 7, wherein: Some of the voltage regulating circuits include a first step-down circuit and a second step-down circuit; The first step-down circuit is connected to the first driving module of the voltage regulating chip, and the first step-down circuit is configured to output a first output voltage based on the input voltage and according to a first driving signal output by the first driving module; The second step-down circuit is connected to the second driving module of the voltage regulating chip, and the second step-down circuit is configured to output a second output voltage based on the input voltage and a second driving signal output by the second driving module.

9. The switching power supply according to claim 8, wherein: The output end of the first step-down circuit is connected to the output end of the second step-down circuit.

10. The switching power supply according to claim 7, wherein: Some of the voltage regulating circuits include an H-bridge voltage regulating circuit; The H-bridge voltage regulating circuit is connected to the first driving module and the second driving module of the voltage regulating chip respectively. The H-bridge voltage regulating circuit is used to output a third output voltage based on the input voltage according to the first driving signal output by the first driving module and the second driving signal output by the second driving module.

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