Voltage conversion circuit and electronic equipment

Abstract

The utility model relates to the technical field of circuits, in particular to a voltage conversion circuit and electronic equipment. The circuit comprises a first terminal, a second terminal, a first energy storage module, a second energy storage module, a third energy storage module, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch and a tenth switch. The first terminal is connected with the first end of the first switch, the second end of the first switch is connected with the first end of the first energy storage module and the first end of the fifth switch, and the second end of the first energy storage module is connected with the first end of the second switch and the first end of the sixth switch. The second end of the second switch is connected with the first end of the second energy storage module and the first end of the seventh switch. By adopting the scheme, the cost and the area of the voltage conversion circuit can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a voltage conversion circuit and electronic equipment. Background Art

[0002] A charge pump, also known as a switched capacitor voltage converter, is a DC-DC converter that uses a "flying" capacitor or a "pumping" capacitor (rather than an inductor or transformer) to store energy. In related technologies, some power switches and capacitors in the voltage conversion circuit correspond to higher voltages, and high-specification power switches and capacitors need to be used, resulting in higher cost and area of ​​the voltage conversion circuit. Utility Model Content

[0003] The utility model provides a voltage conversion circuit and electronic equipment, the main purpose of which is to reduce the cost and area of ​​the voltage conversion circuit.

[0004] According to one aspect of the utility model, a voltage conversion circuit is provided, comprising: a first terminal, a second terminal, a first energy storage module, a second energy storage module, a third energy storage module, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch and a tenth switch; wherein,

[0005] The first terminal is connected to the first end of the first switch, the second end of the first switch is respectively connected to the first end of the first energy storage module and the first end of the fifth switch, the second end of the first energy storage module is respectively connected to the first end of the second switch and the first end of the sixth switch, the second end of the second switch is respectively connected to the first end of the second energy storage module and the first end of the seventh switch, the second end of the second energy storage module is respectively connected to the first end of the third switch, the second end of the sixth switch, the first end of the tenth switch and the first end of the eighth switch, the second end of the third switch is respectively connected to the first end of the third energy storage module and the first end of the ninth switch, the second end of the third energy storage module is respectively connected to the first end of the fourth switch and the second end of the tenth switch, and the second end of the fifth switch, the second end of the ninth switch, the second end of the seventh switch and the second end of the fourth switch are connected to the second terminal;

[0006] A second terminal of the eighth switch is grounded.

[0007] Optionally, in an embodiment of the present invention, the first terminal is an input terminal, and the second terminal is an output terminal; or,

[0008] The first terminal is an output terminal, and the second terminal is an input terminal.

[0009] Optionally, in one embodiment of the present utility model, when the first switch, the second switch, the third switch and the fourth switch are all in the on state, and the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch and the tenth switch are all in the off state, the first terminal, the first energy storage module, the second energy storage module, the third energy storage module and the second terminal are sequentially connected in series;

[0010] The first voltage corresponding to the first terminal is the sum of the first energy storage voltage corresponding to the first energy storage module, the second energy storage voltage corresponding to the second energy storage module, the third energy storage voltage corresponding to the third energy storage module, and the second voltage corresponding to the second terminal.

[0011] Optionally, in one embodiment of the present utility model, when the first switch, the second switch, the third switch and the fourth switch are all in the off state, and the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch and the tenth switch are all in the on state, the first end of the first energy storage module, the first end of the second energy storage module and the first end of the third energy storage module are respectively connected to the second terminal, and the second end of the first energy storage module, the second end of the second energy storage module and the second end of the third energy storage module are grounded.

[0012] Optionally, in an embodiment of the present invention, the first energy storage module, the second energy storage module and the third energy storage module each include at least one capacitor.

[0013] Optionally, in one embodiment of the present invention, the first energy storage module, the second energy storage module and the third energy storage module each include a plurality of capacitors, and a connection mode between the plurality of capacitors includes at least one of a series connection and a parallel connection.

[0014] Optionally, in one embodiment of the present utility model, the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch and the tenth switch each include at least one sub-switch.

[0015] Optionally, in one embodiment of the utility model, the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch and the tenth switch each include a plurality of sub-switches, and a connection method between the plurality of sub-switches includes at least one of a series connection and a parallel connection.

[0016] According to another aspect of the present invention, an electronic device is provided, comprising: at least one voltage conversion circuit as shown in any one of the aforementioned aspects.

[0017] Optionally, in an embodiment of the present invention, there are multiple voltage conversion circuits, and the connection between the multiple voltage conversion circuits includes at least one of series connection and parallel connection.

[0018] In summary, in one or more embodiments of the utility model, the operating voltage of each energy storage module can be the output voltage, and a low withstand voltage capacitor can be used, which can reduce the cost and area of ​​the voltage conversion circuit. In addition, compared with the prior art, the withstand voltage of some switches is significantly reduced, and switches with lower processes can be used, which can reduce the cost and area of ​​the voltage conversion circuit. Secondly, compared with the prior art, the impedance under the same area is significantly reduced, and the working efficiency of the voltage conversion circuit is significantly improved.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0021] Figure 1 A schematic diagram of a dual-phase Dickson structure 4:1 switched capacitor converter provided by an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the structure of a 4:1 switched capacitor converter with an SP structure provided by an embodiment of the utility model;

[0023] Figure 3 A schematic diagram of the structure of a voltage conversion circuit provided by an embodiment of the utility model;

[0024] Figure 4 A schematic diagram of an equivalent circuit of a voltage conversion circuit provided by an embodiment of the utility model;

[0025] Figure 5 A schematic diagram of an equivalent circuit of a voltage conversion circuit provided by another embodiment of the utility model;

[0026] Figure 6 A schematic diagram of the structure of an electronic device provided by an embodiment of the utility model;

[0027] Figure 7A schematic diagram of the structure of an electronic device provided by another embodiment of the utility model;

[0028] Figure 8 A schematic diagram of the structure of an electronic device provided by another embodiment of the utility model;

[0029] Fig. 9 The present invention is a schematic structural diagram of an electronic device provided in yet another embodiment of the present invention.

[0030] Explanation of reference numerals: first energy storage module C1, second energy storage module C2, third energy storage module C3, first switch Q1, second switch Q2, third switch Q3, fourth switch Q4, fifth switch Q5, sixth switch Q6, seventh switch Q7, eighth switch Q8, ninth switch Q9, tenth switch Q10. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. On the contrary, the embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0032] As the charging power of electronic devices increases, high voltage and high current become the development trend. As a result, the power supply voltage of the adapter gradually increases. Therefore, in order to charge electronic devices, a step-down circuit is needed to complete the voltage conversion.

[0033] For example, when the power supply voltage of the adapter is increased to 20V and the voltage supported by the electronic device is 5V, a 4x step-down circuit is needed to complete the voltage conversion, and then a 4:1 switched capacitor converter comes into being.

[0034] In the related technology, Figure 1 The schematic diagram of the structure of a dual-phase Dickson structure 4:1 switched capacitor converter provided by the embodiment of the utility model. Figure 1 As shown, it requires 16 power switches. The large number of power switches makes its drive control scheme more complicated. In addition, the working voltages of its internal capacitors are not the same. The working voltages of some capacitors are higher than the output voltage, which causes the power switches corresponding to these capacitors to have a higher withstand voltage. High-specification power switches and capacitors need to be selected, resulting in higher cost and area of ​​the voltage conversion circuit.

[0035] In the related technology, Figure 2The schematic diagram of the structure of a 4:1 switch capacitor converter with an SP structure provided by an embodiment of the utility model. Although it only needs 10 power switches, the withstand voltages of these ten power switches are S1=3VOUT, S2=3VOUT, S3=2VOUT, S4=2VOUT, S5=VOUT, S6=VOUT, S7=4VOUT, S8=VOUT, S9=VOUT, S10=VOUT, which requires 1 power switch with a withstand voltage of 4VOUT, 2 power switches with a withstand voltage of 3VOUT, 2 power switches with a withstand voltage of 2VOUT, and 5 power switches with a withstand voltage of VOUT. Among them, the withstand voltage of the 5 power switches is relatively high, and high-specification power switches and capacitors need to be selected, resulting in a high cost and area of ​​the voltage conversion circuit.

[0036] The utility model is described in detail below in conjunction with specific embodiments.

[0037] Figure 3 A schematic diagram of the structure of a voltage conversion circuit provided by an embodiment of the utility model.

[0038] like Figure 3 As shown, the voltage conversion circuit includes: a first terminal, a second terminal, a first energy storage module C1, a second energy storage module C2, a third energy storage module C3, a first switch Q1, a second switch Q2, a third switch Q3, a fourth switch Q4, a fifth switch Q5, a sixth switch Q6, a seventh switch Q7, an eighth switch Q8, a ninth switch Q9 and a tenth switch Q10; wherein,

[0039] The first terminal is connected to the first end of the first switch Q1, the second end of the first switch Q1 is respectively connected to the first end of the first energy storage module C1 and the first end of the fifth switch Q5, the second end of the first energy storage module C1 is respectively connected to the first end of the second switch Q2 and the first end of the sixth switch Q6, the second end of the second switch Q2 is respectively connected to the first end of the second energy storage module C2 and the first end of the seventh switch Q7, the second end of the second energy storage module C2 is respectively connected to the first end of the third switch Q3, the second end of the sixth switch Q6, the first end of the tenth switch Q10 and the first end of the eighth switch Q8, the second end of the third switch Q3 is respectively connected to the first end of the third energy storage module C3 and the first end of the ninth switch Q9, the second end of the third energy storage module C3 is respectively connected to the first end of the fourth switch Q4 and the second end of the tenth switch Q10, the second end of the fifth switch Q5, the second end of the ninth switch Q9, the second end of the seventh switch Q7 and the second end of the fourth switch Q4 are connected to the second terminal;

[0040] A second terminal of the eighth switch Q8 is grounded.

[0041] Optionally, when the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 are all in the on state, and the fifth switch Q5, the sixth switch Q6, the seventh switch Q7, the eighth switch Q8, the ninth switch Q9 and the tenth switch Q10 are all in the off state, the first terminal, the first energy storage module C1, the second energy storage module C2, the third energy storage module C3 and the second terminal are connected in series in sequence, such as Figure 4 shown.

[0042] In this case, the first voltage V1 corresponding to the first terminal is the sum of the first energy storage voltage VC1 corresponding to the first energy storage module C1, the second energy storage voltage VC2 corresponding to the second energy storage module C2, the third energy storage voltage VC3 corresponding to the third energy storage module C3, and the second voltage V2 corresponding to the second terminal, that is, V1=VC1+VC2+VC3+V2.

[0043] According to some embodiments, when the operating voltages of the first energy storage module C1 , the second energy storage module C2 , and the third energy storage module C3 are the same, V1 = 4VC1 = 4VC2 = 4VC3 = 4V2.

[0044] Optionally, when the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 are all in the off state, and the fifth switch Q5, the sixth switch Q6, the seventh switch Q7, the eighth switch Q8, the ninth switch Q9 and the tenth switch Q10 are all in the on state, the first end of the first energy storage module C1, the first end of the second energy storage module C2 and the first end of the third energy storage module C3 are respectively connected to the second terminal, and the second end of the first energy storage module C1, the second end of the second energy storage module C2 and the second end of the third energy storage module C3 are grounded, such as Figure 5 shown.

[0045] Taking a scenario as an example, when the first terminal is the input terminal, the second terminal is the output terminal, and the first energy storage module C1, the second energy storage module C2, and the third energy storage module C3 are of the same model, first, the first terminal, the first energy storage module C1, the second energy storage module C2, the third energy storage module C3, and the second terminal can be controlled to be connected in series in sequence, so that the first voltage V1 input to the first terminal is used to charge the first energy storage module C1, the second energy storage module C2, and the third energy storage module C3 until V1=4VC1=4VC2=4VC3. Then, the first energy storage module C1, the second energy storage module C2, and the third energy storage module C3 can be controlled to be connected in parallel, so that the first energy storage module C1, the second energy storage module C2, and the third energy storage module C3 discharge the second terminal, at this time, VC1=VC2=VC3=V2. Therefore, the two stages are cross-operated, and the second terminal can be kept for a 4-fold voltage reduction output.

[0046] Taking a scenario as an example, when the first terminal is the output terminal and the second terminal is the input terminal, first, the first energy storage module C1, the second energy storage module C2, and the third energy storage module C3 can be controlled to be connected in parallel, so that the second voltage V2 input to the second terminal charges the first energy storage module C1, the second energy storage module C2, and the third energy storage module C3 until VC1=VC2=VC3=V2. Then, the first terminal, the first energy storage module C1, the second energy storage module C2, the third energy storage module C3, and the second terminal can be controlled to be connected in series in sequence, so that the second terminal, the first energy storage module C1, the second energy storage module C2, and the third energy storage module C3 all provide output voltages to the first terminal. At this time, V1=VC1+VC2+VC3+V2=4V2. Therefore, these two stages are cross-operated to keep the first terminal for a 4-fold boost output.

[0047] Optionally, the first energy storage module C1, the second energy storage module C2 and the third energy storage module C3 each include at least one capacitor.

[0048] According to some embodiments, when the first energy storage module C1, the second energy storage module C2 and the third energy storage module C3 all include multiple capacitors, the connection mode between the multiple capacitors in each energy storage module includes at least one of series connection and parallel connection.

[0049] Optionally, each of the first switch Q1 , the second switch Q2 , the third switch Q3 , the fourth switch Q4 , the fifth switch Q5 , the sixth switch Q6 , the seventh switch Q7 , the eighth switch Q8 , the ninth switch Q9 and the tenth switch Q10 includes at least one sub-switch.

[0050] According to some embodiments, when the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the fifth switch Q5, the sixth switch Q6, the seventh switch Q7, the eighth switch Q8, the ninth switch Q9 and the tenth switch Q10 each include multiple sub-switches, the connection method between the multiple sub-switches in each switch includes at least one of a series connection and a parallel connection.

[0051] In some embodiments, the types of sub-switches include but are not limited to mechanical switches, N-type transistors, P-type transistors, etc. The types of transistors include but are not limited to bipolar junction transistors (Bipolar Junction Transistor, BJT), gate turn-off thyristors (Gate Turn-off Thyristor, GTO), insulated gate bipolar transistors (Insulated Gate Bipolar Transistor, IGBT), integrated gate commutated thyristors (Integrated Gate Commuted Transistor, IGCT), metal oxide semiconductor field effect transistors (Metal Oxide Semiconductor Field Effect Transistor, MOSFET, MOS), gallium nitride field effect transistors (GaN FET), etc.

[0052] In some embodiments, Figure 3 As shown, the sub-switch may also include, for example, a transistor and a diode connected in reverse parallel to the transistor, wherein the connection point between the drain of the transistor and the cathode of the diode is the first end of the sub-switch, and the connection point between the source of the transistor and the anode of the diode is the second end of the sub-switch.

[0053] It should be noted that compared with Figure 2 In the circuit shown, the withstand voltage of Q6 is also reduced to the output voltage, so a MOS tube with a lower process can be used, saving area. With the same area, the impedance is significantly reduced and the system efficiency is significantly reduced.

[0054] In summary, in the voltage conversion circuit provided by the embodiment of the utility model, the operating voltage of each energy storage module can be the output voltage, and a low withstand voltage capacitor can be used, which can reduce the cost and area of ​​the voltage conversion circuit. In addition, compared with the prior art, the withstand voltage of some switches is significantly reduced, and switches with lower processes can be used, which can reduce the cost and area of ​​the voltage conversion circuit. Secondly, compared with the prior art, the impedance under the same area is significantly reduced, and the working efficiency of the voltage conversion circuit is significantly improved.

[0055] An embodiment of the utility model also provides an electronic device.

[0056] Specifically, the electronic device includes: at least one voltage conversion circuit as shown in any of the above embodiments.

[0057] Optionally, when there are multiple voltage conversion circuits, the connection between the multiple voltage conversion circuits includes at least one of a series connection and a parallel connection.

[0058] Take a scenario as an example. Figure 6This is a schematic diagram of the structure of an electronic device provided by an embodiment of the utility model. Figure 6 As shown, the N voltage conversion circuits are connected in multi-phase parallel, and N is a positive integer greater than 1.

[0059] Figure 7 This is a schematic diagram of the structure of an electronic device provided by an embodiment of the utility model. Figure 7 As shown, the N voltage conversion circuits are connected in multi-phase series.

[0060] Figure 8 This is a schematic diagram of the structure of an electronic device provided by an embodiment of the utility model. Figure 8 As shown, the N voltage conversion circuits adopt a multi-phase series-parallel hybrid connection method, wherein the N voltage conversion circuits are first connected in parallel and then connected in series with the N voltage conversion circuits in sequence as a whole.

[0061] Fig. 9 This is a schematic diagram of the structure of an electronic device provided by an embodiment of the utility model. Fig. 9 As shown, the N voltage conversion circuits adopt a multi-phase series-parallel hybrid connection mode, wherein the N voltage conversion circuits are first connected in series and then connected in parallel with the N voltage conversion circuits to form an overall series connection.

[0062] In summary, in the electronic device provided by the embodiment of the utility model, the operating voltage of each energy storage module can be the output voltage, and a low withstand voltage capacitor can be used, which can reduce the cost and area of ​​the voltage conversion circuit. In addition, compared with the prior art, the withstand voltage of some switches is significantly reduced, and switches with lower processes can be used, which can reduce the cost and area of ​​the voltage conversion circuit. Secondly, compared with the prior art, the impedance under the same area is significantly reduced, and the working efficiency of the voltage conversion circuit is significantly improved.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms may be for different embodiments or examples. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A voltage conversion circuit, characterized in that: include: A first terminal, a second terminal, a first energy storage module, a second energy storage module, a third energy storage module, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch and a tenth switch; wherein, The first terminal is connected to the first end of the first switch, the second end of the first switch is respectively connected to the first end of the first energy storage module and the first end of the fifth switch, the second end of the first energy storage module is respectively connected to the first end of the second switch and the first end of the sixth switch, the second end of the second switch is respectively connected to the first end of the second energy storage module and the first end of the seventh switch, the second end of the second energy storage module is respectively connected to the first end of the third switch, the second end of the sixth switch, the first end of the tenth switch and the first end of the eighth switch, the second end of the third switch is respectively connected to the first end of the third energy storage module and the first end of the ninth switch, the second end of the third energy storage module is respectively connected to the first end of the fourth switch and the second end of the tenth switch, and the second end of the fifth switch, the second end of the ninth switch, the second end of the seventh switch and the second end of the fourth switch are connected to the second terminal; A second terminal of the eighth switch is grounded.

2. The voltage conversion circuit according to claim 1, characterized in that: The first terminal is an input terminal, and the second terminal is an output terminal; or, The first terminal is an output terminal, and the second terminal is an input terminal.

3. The voltage conversion circuit according to claim 1, characterized in that: When the first switch, the second switch, the third switch and the fourth switch are all in the on state, and the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch and the tenth switch are all in the off state, the first terminal, the first energy storage module, the second energy storage module, the third energy storage module and the second terminal are connected in series in sequence; The first voltage corresponding to the first terminal is the sum of the first energy storage voltage corresponding to the first energy storage module, the second energy storage voltage corresponding to the second energy storage module, the third energy storage voltage corresponding to the third energy storage module, and the second voltage corresponding to the second terminal.

4. The voltage conversion circuit according to claim 1, characterized in that: When the first switch, the second switch, the third switch and the fourth switch are all in the off state, and the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch and the tenth switch are all in the on state, the first end of the first energy storage module, the first end of the second energy storage module and the first end of the third energy storage module are respectively connected to the second terminal, and the second end of the first energy storage module, the second end of the second energy storage module and the second end of the third energy storage module are grounded.

5. The voltage conversion circuit according to any one of claims 1 or 4, characterized in that: The first energy storage module, the second energy storage module and the third energy storage module each include at least one capacitor.

6. The voltage conversion circuit according to claim 5, characterized in that: The first energy storage module, the second energy storage module and the third energy storage module each include a plurality of capacitors, and a connection mode between the plurality of capacitors includes at least one of a series connection and a parallel connection.

7. The voltage conversion circuit according to claim 1, characterized in that: Each of the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch, and the tenth switch includes at least one sub-switch.

8. The voltage conversion circuit according to claim 7, characterized in that: The first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch and the tenth switch each include a plurality of sub-switches, and a connection method between the plurality of sub-switches includes at least one of a series connection and a parallel connection.

9. An electronic device, characterized in that: include: At least one voltage conversion circuit as claimed in any one of claims 1 to 8.

10. The electronic device according to claim 9, characterized in that: There are multiple voltage conversion circuits, and the connection between the multiple voltage conversion circuits includes at least one of series connection and parallel connection.

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