Voltage conversion circuit and electronic device

Abstract

The utility model provides a voltage conversion circuit and electronic equipment. The voltage conversion circuit comprises a charge pump circuit and a buck-boost conversion circuit. The input end of the charge pump circuit is electrically connected with a battery, and the output end of the charge pump circuit is electrically connected with the input end of the buck-boost conversion circuit; the output end of the buck-boost conversion circuit is electrically connected with a load; the charge pump circuit is used for adjusting the output voltage of the charge pump circuit according to the input voltage and the output voltage of the buck-boost conversion circuit; and the buck-boost conversion circuit is used for generating a target voltage required by the load according to the output voltage of the charge pump circuit. According to the embodiment, the charge pump circuit provides the input voltage for the buck-boost conversion circuit, so that the input voltage and the output voltage of the buck-boost conversion circuit can be close, and the conversion efficiency of the buck-boost conversion circuit can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of power supply technology, and in particular to a voltage conversion circuit and electronic equipment. Background Art

[0002] Existing electronic devices are often equipped with a boost circuit, such as a boost circuit. This boost circuit takes the battery voltage as input and provides output voltages, such as ELVDD and AVDD, to the display. ELVDD can be used as the driving voltage for the pixel circuit, while AVDD can be used as the scanning voltage for the pixel voltage.

[0003] However, as the battery voltage drops, the voltage difference between the output voltage and input voltage of the boost circuit gradually increases, resulting in a gradually lower efficiency. Utility Model Content

[0004] The present disclosure provides a voltage conversion circuit and an electronic device to solve the above technical problems.

[0005] According to a first aspect of the present disclosure, a voltage conversion circuit is provided, comprising: a charge pump circuit and a buck-boost conversion circuit; an input end of the charge pump circuit is electrically connected to a battery, an output end of the charge pump circuit is electrically connected to an input end of the buck-boost conversion circuit; and an output end of the buck-boost conversion circuit is electrically connected to a load;

[0006] The charge pump circuit is used to adjust its own output voltage according to the input voltage and output voltage of the buck-boost conversion circuit;

[0007] The buck-boost conversion circuit is used to generate a target voltage required by the load according to the output voltage of the charge pump circuit.

[0008] Optionally, the voltage conversion ratio of the charge pump circuit includes at least one of the following: 1:1, 1.5:1, or 2:1;

[0009] The voltage conversion ratio refers to the ratio of the output voltage to the input voltage of the charge pump circuit.

[0010] Optionally, when the voltage conversion ratio of the charge pump circuit is 1:1, the charge pump circuit includes a first switching device and a first output capacitor;

[0011] A first end of the first switching device is electrically connected to the output end of the charge pump circuit, a second end of the first switching device is electrically connected to the first end of the first output capacitor and the output end of the charge pump circuit respectively, a control end of the first switching device is used to receive a control signal; and a second end of the first output capacitor is grounded;

[0012] The first switching device is configured to switch to an on state when receiving a control signal to conduct electricity between the first end of the charge pump circuit and the first end of the first output capacitor; and the first switching device is configured to switch to an off state when not receiving a control signal to disconnect the first end of the charge pump circuit and the first end of the first output capacitor;

[0013] The first output capacitor is used to charge when the first switching device is switched to the on state, and is also used to discharge when the first switching device is switched to the off state.

[0014] Optionally, when the voltage conversion ratio of the charge pump circuit is 1.5:1, the charge pump circuit includes a second switching device, a third switching device, a fourth switching device, a fifth switching device, a sixth switching device, a seventh switching device, an eighth switching device, a first capacitor, a second capacitor and a first output capacitor;

[0015] a first end of the second switching device electrically connected to the output end of the charge pump circuit, a second end of the second switching device electrically connected to the first end of the first capacitor, the first end of the third switching device, and the first end of the fourth switching device, respectively, and a control end of the second switching device configured to receive a control signal;

[0016] The first end of the third switching device is electrically connected to the first end of the first output capacitor and the output end of the charge pump circuit respectively, and the control end of the third switching device is used to receive a control signal; the second end of the first output capacitor is grounded;

[0017] The second end of the fourth switching device is electrically connected to the second end of the fifth switching device and the first end of the second capacitor respectively, and the control end of the fourth switching device is used to receive a control signal;

[0018] The first end of the fifth switching device is electrically connected to the second end of the first capacitor and the second end of the seventh switching device respectively, and the control end of the fifth switching device is used to receive a control signal;

[0019] a first end of the eighth switching device is electrically connected to the first end of the seventh switching device and the input end of the charge pump circuit, respectively; a second end of the eighth switching device is electrically connected to the second end of the second capacitor and the first end of the sixth switching device, respectively; a control end of the eighth switching device is configured to receive a control signal; and a second end of the sixth switching device is grounded;

[0020] The second switching device, the third switching device, the fourth switching device, the fifth switching device, the sixth switching device, the seventh switching device, and the eighth switching device are configured to switch to an on state when receiving a control signal, and also to switch to an off state when not receiving a control signal;

[0021] The first capacitor and the second capacitor are used to charge in series when the second switching device, the fifth switching device and the sixth switching device are switched to the on state, and are also used to discharge in parallel when the seventh switching device, the eighth switching device and the third switching device are switched to the off state.

[0022] Optionally, when the voltage conversion ratio of the charge pump circuit is 2:1, the charge pump circuit includes a ninth switching device; the second end of the ninth switching device is electrically connected to the second end of the first capacitor, the first end of the fifth switching device, and the second end of the seventh switching device, respectively; the first end of the ninth switching device is grounded; and the control end of the ninth switching device is configured to receive a control signal;

[0023] The ninth switching device is configured to switch to an on state when receiving a control signal, and switch to an off state when not receiving a control signal;

[0024] The first capacitor and the second capacitor are also used to charge in parallel when the second switching device, the ninth switching device, the fourth switching device and the sixth switching device are switched to the on state, and are also used to discharge in parallel when the seventh switching device, the eighth switching device and the third switching device are switched to the off state.

[0025] Optionally, the charge pump circuit further includes a first control circuit, wherein the first control circuit is electrically connected to the input terminal and the output terminal of the buck-boost conversion circuit respectively and is also electrically connected to a switching device in the charge pump circuit;

[0026] The first control circuit is used to determine the voltage conversion ratio of the charge pump circuit according to the input voltage and output voltage of the buck-boost conversion circuit, and output a control signal to the switching device in the charge pump circuit according to the voltage conversion ratio.

[0027] Optionally, the first control circuit includes a first comparator, a first voltage divider circuit, a second comparator, a second voltage divider circuit, a third comparator, a third voltage divider circuit, a time signal generator, and a control signal generator;

[0028] A first end of the first voltage divider circuit is electrically connected to the output end of the buck-boost conversion circuit, a second end of the first voltage divider circuit is grounded, and a voltage divider end of the first voltage divider circuit is electrically connected to the first input end of the first comparator;

[0029] The second input terminal of the first comparator is electrically connected to the output terminal of the charge pump circuit, and the output terminal of the first comparator is electrically connected to the first input terminal of the control signal generator;

[0030] A first end of the second voltage divider circuit is electrically connected to the output end of the buck-boost conversion circuit, a second end of the second voltage divider circuit is grounded, and a voltage divider end of the second voltage divider circuit is electrically connected to the first input end of the second comparator;

[0031] The second input terminal of the second comparator is electrically connected to the output terminal of the charge pump circuit, and the output terminal of the second comparator is electrically connected to the second input terminal of the control signal generator;

[0032] A first end of the third voltage divider circuit is electrically connected to the output end of the buck-boost conversion circuit, a second end of the third voltage divider circuit is grounded, and a voltage divider end of the third voltage divider circuit is electrically connected to the first input end of the third comparator;

[0033] The second input terminal of the third comparator is electrically connected to the output terminal of the charge pump circuit, and the output terminal of the third comparator is electrically connected to the third input terminal of the control signal generator;

[0034] The fourth input terminal of the control signal generator is electrically connected to the output terminal of the time signal generator, and the control signal generator is used to determine the target voltage conversion ratio based on the input signals of the first input terminal, the second input terminal and the third input terminal, and generate the control signal required for the target voltage conversion ratio based on the clock signal output by the time signal generator.

[0035] Optionally, the buck-boost conversion circuit includes a voltage conversion bridge and a second output capacitor, wherein the input end of the voltage conversion bridge is electrically connected to the output end of the charge pump circuit, the output end of the voltage conversion bridge is electrically connected to the output end of the charge pump circuit and the first end of the second output capacitor, respectively, and the control end of the voltage conversion bridge is used to receive a control signal; and the second end of the second output capacitor is grounded;

[0036] The voltage conversion bridge is configured to output a target voltage higher or lower than a received input voltage upon receiving a control signal.

[0037] Optionally, the voltage conversion bridge includes a tenth switching device, an eleventh switching device, a twelfth switching device, a thirteenth switching device and a first inductor;

[0038] The first end of the tenth switching device is electrically connected to the input end of the voltage conversion bridge, the second end of the tenth switching device is electrically connected to the first end of the first inductor and the first end of the twelfth switching device respectively; the second end of the twelfth switching device is grounded;

[0039] The first end of the eleventh switching device is electrically connected to the second output capacitor and the output end of the voltage conversion circuit respectively, and the second end of the eleventh switching device is electrically connected to the second end of the first inductor and the first end of the thirteenth switching device respectively; the second end of the thirteenth switching device is grounded;

[0040] Control terminals of the tenth switching device, the eleventh switching device, the twelfth switching device, and the thirteenth switching device receive a control signal;

[0041] The first inductor is configured to charge when the tenth switching device and the thirteenth switching device are switched to the on state, and discharge when the tenth switching device and the eleventh switching device are switched to the on state;

[0042] The first inductor is configured to charge when the tenth switching device and the thirteenth switching device are switched to the on state, and discharge when the eleventh switching device and the twelfth switching device are switched to the on state.

[0043] Optionally, the buck-boost conversion circuit further includes a second control circuit; the second control circuit is used to generate a control signal required by the voltage conversion bridge according to the voltage conversion ratio and the target voltage.

[0044] According to a first aspect of the present disclosure, an electronic device is provided, comprising a battery, a voltage conversion circuit as described in any one of the first aspects, and a load; the voltage conversion circuit is used to convert the voltage of the battery into a target voltage required by the load.

[0045] The technical solutions provided by the embodiments of the present disclosure may have the following beneficial effects:

[0046] The voltage conversion circuit provided in this embodiment includes: a charge pump circuit and a buck-boost conversion circuit; the input end of the charge pump circuit is electrically connected to a battery, the output end of the charge pump circuit is electrically connected to the input end of the buck-boost conversion circuit; the output end of the buck-boost conversion circuit is electrically connected to a load; the charge pump circuit is configured to adjust its output voltage based on the input voltage and output voltage of the buck-boost conversion circuit; and the buck-boost conversion circuit is configured to generate a target voltage required by the load based on the output voltage of the charge pump circuit. Thus, in this embodiment, by providing an input voltage to the buck-boost conversion circuit through the charge pump circuit, the input voltage and output voltage of the buck-boost conversion circuit can be made close, which is beneficial to improving the conversion efficiency of the buck-boost conversion circuit.

[0047] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a block diagram of a voltage conversion circuit according to an embodiment of the present disclosure.

[0049] Figure 2 This is a circuit diagram of a charge pump circuit according to an embodiment of the present disclosure.

[0050] Figure 3 FIG. 4 is a circuit diagram of another charge pump circuit according to an embodiment of the present disclosure.

[0051] Figure 4 This is an equivalent circuit diagram of a first capacitor and a second capacitor in a charge pump circuit according to an embodiment of the present disclosure when charging in series.

[0052] Figure 5 This is an equivalent circuit diagram of a first capacitor and a second capacitor in a charge pump circuit according to an embodiment of the present disclosure when they are charged in parallel.

[0053] Figure 6 FIG. 4 is a circuit diagram of another charge pump circuit according to an embodiment of the present disclosure.

[0054] Figure 7 This is an equivalent circuit diagram of a first capacitor and a second capacitor in a charge pump circuit according to an embodiment of the present disclosure when they are charged in parallel.

[0055] Figure 8 This is an equivalent circuit diagram of a first capacitor and a second capacitor in a charge pump circuit according to an embodiment of the present disclosure when they are charged in parallel.

[0056] Figure 9 FIG. 4 is a circuit diagram of another charge pump circuit according to an embodiment of the present disclosure.

[0057] Figure 10FIG. 4 is a circuit diagram of a first control circuit of a charge pump circuit according to an embodiment of the present disclosure.

[0058] Figure 11 This is a circuit diagram of a voltage conversion bridge according to an embodiment of the present disclosure.

[0059] Figure 12 FIG. 4 is a circuit diagram of another charge pump circuit according to an embodiment of the present disclosure.

[0060] Figure 13 This is a block diagram of an electronic device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0061] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present disclosure. Rather, they are merely examples of devices consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0062] The present disclosure provides a voltage conversion circuit and an electronic device. Figure 1 The voltage conversion circuit includes a charge pump circuit 11 and a buck-boost conversion circuit 12. The input of the charge pump circuit 11 is electrically connected to the battery BAT, and the output of the charge pump circuit 11 is electrically connected to the input of the buck-boost conversion circuit 12. The output of the buck-boost conversion circuit 12 is electrically connected to a load 13. The charge pump circuit 11 is used to adjust its output voltage based on the input voltage and output voltage of the buck-boost conversion circuit 12. The buck-boost conversion circuit 12 is used to generate the target voltage required by the load 13 based on the output voltage of the charge pump circuit 11.

[0063] The inventive concept of the above-mentioned voltage conversion circuit is that, first, the voltage difference between the input voltage and the output voltage of the buck-boost conversion circuit 12 is reduced, and a charge pump circuit 11 is added to the voltage conversion circuit; the charge pump circuit 11 is used to amplify the battery voltage to achieve the effect of increasing the input voltage of the buck-boost conversion circuit 12; second, during use, the output voltage of the charge pump circuit 11 can be dynamically adjusted according to the input voltage and output voltage of the buck-boost conversion circuit 12 to ensure that the voltage difference between the input voltage and the output voltage of the buck-boost conversion circuit 12 is as small as possible.

[0064] In this way, the inventive concept disclosed herein dynamically adjusts the voltage conversion ratio through the charge pump circuit, so that the voltage difference between the input voltage and the output voltage of the buck-boost conversion circuit is as small as possible. Since the conversion efficiency of the charge pump circuit is relatively high and can be ignored, the conversion efficiency of the buck-boost conversion circuit is greatly improved, and ultimately the conversion efficiency of the voltage conversion circuit is greatly improved.

[0065] It should be noted that the voltage conversion ratio of the charge pump circuit 11, the ratio of the output voltage to the input voltage of the charge pump circuit, can be set according to the specific scenario. For example, when the voltage fluctuation range of the battery in the electronic device is 3.5 to 5V, the voltage conversion ratio of the charge pump circuit 11 includes at least one of the following: 1:1, 1.5:1, or 2:1. In other words, the charge pump circuit 11 can amplify the battery voltage by 1 times, 1.5 times, or 2 times. It should be noted that those skilled in the art can adjust the voltage conversion ratio according to the specific scenario.

[0066] In one example, when the voltage conversion ratio of the charge pump circuit is 1:1, see Figure 2 The charge pump circuit 11 includes a first switching device Q1 and a first output capacitor C3. A first terminal of the first switching device Q1 is electrically connected to the input terminal of the charge pump circuit 11 (or the positive terminal of the battery BAT), and a second terminal of the first switching device Q1 is electrically connected to the first terminal of the first output capacitor C3 and the output terminal of the charge pump circuit 11, respectively. The control terminal of the first switching device Q1 is used to receive a control signal; the second terminal of the first output capacitor C3 is grounded.

[0067] The first switching device Q1 is used to switch to the on state when receiving a control signal to connect the first end of the charge pump circuit 11 and the first end of the first output capacitor C3; the first switching device Q1 is used to switch to the off state when not receiving a control signal to disconnect the first end of the charge pump circuit 11 and the first end of the first output capacitor C3; the first output capacitor C3 is used to charge when the first switching device Q1 is switched to the on state, and is also used to discharge when the first switching device Q1 is switched to the off state.

[0068] In this way, in this embodiment, the charge and discharge voltage V1 of the first output capacitor C3 during charging and discharging is equal to the battery voltage VBAT, achieving the effect of amplifying the battery voltage by 1 times, that is, the voltage conversion ratio of the charge pump circuit is 1:1, which can adapt to the scenario where the battery BAT is fully charged.

[0069] In one example, when the voltage conversion ratio of the charge pump circuit is 1.5:1, see Figure 3 The charge pump circuit 11 includes a second switching device Q2, a third switching device Q3, a fourth switching device Q4, a fifth switching device Q5, a sixth switching device Q6, a seventh switching device Q7, an eighth switching device Q8, a first capacitor C1, a second capacitor C2 and a first output capacitor C3;

[0070] A first end of the second switching device Q2 is electrically connected to the input end of the charge pump circuit 11, a second end of the second switching device Q2 is electrically connected to the first end of the first capacitor C1, the first end of the third switching device Q3, and the first end of the fourth switching device Q4, respectively, and a control end of the second switching device Q2 is used to receive a control signal;

[0071] A first terminal of the third switching device Q3 is electrically connected to a first terminal of the first output capacitor C3 and an output terminal of the charge pump circuit 11, respectively. A control terminal of the third switching device Q3 is used to receive a control signal. A second terminal of the first output capacitor C3 is grounded.

[0072] The second end of the fourth switching device Q4 is electrically connected to the second end of the fifth switching device Q5 and the first end of the second capacitor C2, respectively, and the control end of the fourth switching device Q4 is used to receive a control signal;

[0073] A first end of the fifth switching device Q5 is electrically connected to the second end of the first capacitor C1 and the second end of the seventh switching device Q7, respectively. A control end of the fifth switching device Q5 is used to receive a control signal.

[0074] A first end of the eighth switching device Q8 is electrically connected to the first end of the seventh switching device Q7 and the input end of the charge pump circuit 11, respectively. A second end of the eighth switching device Q8 is electrically connected to the second end of the second capacitor C2 and the first end of the sixth switching device Q6, respectively. A control end of the eighth switching device Q8 is configured to receive a control signal. A second end of the sixth switching device Q6 is grounded.

[0075] The second switching device Q2, the third switching device Q3, the fourth switching device Q4, the fifth switching device Q5, the sixth switching device Q6, the seventh switching device Q7 and the eighth switching device Q8 are configured to switch to an on state when receiving a control signal, and also to switch to an off state when not receiving a control signal;

[0076] The first capacitor C1 and the second capacitor C2 are used to charge in series when the second switch device Q2, the fifth switch device Q5 and the sixth switch device Q6 are switched to the on state. The equivalent circuit is as follows: Figure 4 and also for discharging in parallel when the seventh switching device Q7, the eighth switching device Q8 and the third switching device Q3 are switched to the off state, the equivalent circuit is as shown Figure 5 shown.

[0077] Continue to see Figure 4 , the first capacitor C1 and the second capacitor C2 share the battery voltage VBAT when they are charged in series; when the first capacitor C1 and the second capacitor C2 are the same, their respective voltage values ​​are VBAT / 2. Figure 5When the first capacitor C1 and the second capacitor C2 are charged in parallel, the voltage they provide is VBAT / 2. When the battery voltage VBAT is superimposed, the output voltage is 1.5VBAT, which amplifies the battery voltage BAT by 1.5 times. That is, the voltage conversion ratio of the charge pump circuit is 1.5:1, which can adapt to the scenario where the battery BAT power has decreased.

[0078] It should be noted that Figures 3 to 5 In the example, the charge pump circuit has voltage conversion ratios of 1:1 and 1.5:1. You can choose whether to retain the 1:1 voltage conversion ratio function according to the specific scenario. When the 1:1 voltage conversion ratio is not required, the first switching device Q1 can be deleted to simplify the circuit.

[0079] In one example, when the voltage conversion ratio of the charge pump circuit is 2:1, see Figure 6 The charge pump circuit 11 includes a ninth switching device Q9; a second end of the ninth switching device Q9 is electrically connected to the second end of the first capacitor C1, the first end of the fifth switching device Q5, and the second end of the seventh switching device Q7, respectively; a first end of the ninth switching device Q9 is grounded to GND, and a control end of the ninth switching device Q9 is used to receive a control signal;

[0080] The ninth switching device Q9 is configured to switch to an on state when receiving a control signal, and switch to an off state when not receiving a control signal;

[0081] The first capacitor C1 and the second capacitor C2 are also used for charging in parallel when the second switching device Q2, the ninth switching device Q9, the fourth switching device Q4 and the sixth switching device Q6 are switched to the on state. The equivalent circuit is as follows: Figure 7 and also for discharging in parallel when the seventh switching device Q7, the eighth switching device Q8 and the third switching device Q3 are switched to the off state, the equivalent circuit is as shown Figure 8 shown.

[0082] Continue to see Figure 7 , when the first capacitor C1 and the second capacitor C2 are charged in parallel, their respective voltages are VBAT; continue to refer to Figure 8 When the first capacitor C1 and the second capacitor C2 are discharged in parallel, their respective voltages are VBAT. Adding the battery voltage VBAT, the voltage value of the first output capacitor C3 is 2BAT, that is, the voltage conversion ratio of the charge pump circuit is 2:1, which can adapt to the scenario where the battery BAT is low.

[0083] It should be noted that Figures 6 to 8In the example, the charge pump circuit has voltage conversion ratios of 1:1, 1.5:1, and 2:1. You can choose whether to retain the 1:1 voltage conversion ratio function according to the specific scenario. When a 1:1 voltage conversion ratio is not required, the first switching device Q1 can be deleted to simplify the circuit.

[0084] In one example, see Figure 9 The charge pump circuit 11 further includes a first control circuit 91. The first control circuit 91 is electrically connected to the input and output terminals of the buck-boost converter circuit 12 and to the switching devices in the charge pump circuit 11. The first control circuit 91 is configured to determine a voltage conversion ratio of the charge pump circuit 11 based on the input voltage and output voltage of the buck-boost converter circuit 12, and output a control signal to the switching devices in the charge pump circuit 11 based on the voltage conversion ratio.

[0085] In one example, see Figure 10 The first control circuit 91 includes a first comparator A1, a first voltage divider circuit 101, a second comparator A2, a second voltage divider circuit 102, a third comparator A3, a third voltage divider circuit 103, a time signal generator CLK GEN, and a control signal generator DRV CTRL;

[0086] A first end of the first voltage divider circuit 101 is electrically connected to the output end of the buck-boost converter circuit 12 , a second end of the first voltage divider circuit 101 is grounded, and a voltage divider end of the first voltage divider circuit 101 is electrically connected to a first input end of the first comparator A1 ;

[0087] The second input terminal of the first comparator A1 is electrically connected to the input terminal of the charge pump circuit 11, and the output terminal of the first comparator A1 is electrically connected to the first input terminal of the control signal generator DRV CTRL;

[0088] A first end of the second voltage divider circuit 102 is electrically connected to the output end of the buck-boost converter circuit 12 , a second end of the second voltage divider circuit 102 is grounded, and a voltage divider end of the second voltage divider circuit 102 is electrically connected to a first input end of the second comparator A2 ;

[0089] A second input terminal of the second comparator A2 is electrically connected to an input terminal of the charge pump circuit 11, and an output terminal of the second comparator A2 is electrically connected to a second input terminal of the control signal generator DRV CTRL;

[0090] A first end of the third voltage divider circuit 103 is electrically connected to the output end of the buck-boost converter circuit 12 , a second end of the third voltage divider circuit 103 is grounded, and a voltage divider end of the third voltage divider circuit 103 is electrically connected to a first input end of the third comparator A3 ;

[0091] A second input terminal of the third comparator A3 is electrically connected to an input terminal of the charge pump circuit 11, and an output terminal of the third comparator A3 is electrically connected to a third input terminal of the control signal generator DRV CTRL;

[0092] The fourth input terminal of the control signal generator DRV CTRL is electrically connected to the output terminal of the time signal generator CLK GEN. The control signal generator DRV CTRL is used to determine the target voltage conversion ratio according to the input signals of the first input terminal, the second input terminal and the third input terminal, and to generate the control signal required for the target voltage conversion ratio according to the clock signal output by the time signal generator CLK GEN.

[0093] Continue to see Figure 10 The first voltage divider circuit 101 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is grounded GND, the second end of the first resistor R1 is electrically connected to the voltage divider end of the first voltage divider circuit 101 and the first end of the second resistor R2, respectively, and the second end of the second resistor R2 is electrically connected to the output end of the buck-boost converter circuit 12. The first resistor R1 and the second resistor R2 have the same resistance value. Thus, the voltage at the voltage divider end of the first voltage divider circuit 101 is Vload / 2, which is half of the output voltage of the buck-boost converter circuit 12 or half of the target voltage required by the load 13.

[0094] Continue to see Figure 10 The second voltage divider circuit 102 includes a third resistor R3 and a fourth resistor R4. The first end of the third resistor R3 is grounded GND, the second end of the third resistor R3 is electrically connected to the voltage divider terminal of the second voltage divider circuit 102 and the first end of the fourth resistor R4, respectively, and the second end of the fourth resistor R4 is electrically connected to the output terminal of the buck-boost converter circuit 12. The resistance ratio of the third resistor R3 to the fourth resistor R4 is 2:1, and the voltage at the voltage divider terminal of the second voltage divider circuit 102 is 2Vload / 3, which is 2 / 3 of the output voltage of the buck-boost converter circuit 12, or 2 / 3 of the target voltage required by the load 13.

[0095] Continue to see Figure 10 The third voltage divider circuit 103 includes a fifth resistor R5 and a sixth resistor R6. The first end of the fifth resistor R5 is grounded to GND, the second end of the fifth resistor R5 is electrically connected to the voltage divider terminal of the third voltage divider circuit 103 and the first end of the sixth resistor R6, respectively, and the second end of the sixth resistor R6 is electrically connected to the output terminal of the buck-boost converter circuit 12. The sixth resistor R6 can be implemented as a zero-ohm resistor. The voltage value at the voltage divider terminal of the third voltage divider circuit 103 is Vload, which is the output voltage of the buck-boost converter circuit 12 or the target voltage required by the load 13.

[0096] It should be noted that the first voltage divider circuit 101, the second voltage divider circuit 102, and the third voltage divider circuit 103 are configured to provide a reference voltage for each comparator, thereby dividing the output voltage of the charge pump circuit into four intervals: VBAT to Vload / 2, Vload / 2 to 2Vload / 3, and 2Vload / 3 to xVload. Where x is greater than or equal to 1, the output voltage of the charge pump circuit may be greater than the target voltage required by the load 13.

[0097] It should be noted that each of the first comparator A1, the second comparator A2, and the third comparator A3 receives two input data and obtains a comparison result, such as 0 or 1, to indicate that the output voltage of the charge pump circuit 11 is greater than or less than the reference voltage. This can be set according to specific scenarios. Assuming that the output result is 1 if it is greater than or equal to the reference voltage, and 0 if it is less than the reference voltage, the comparison results of the first comparator A1, the second comparator A2, and the third comparator A3 can be 000, 010, 110, and 111.

[0098] The control signal generator DRV CTRL can output a control signal to a portion of the switching devices Q1 to Q9 according to the time signal generator CLK GEN and the comparison result, thereby achieving the effect of controlling the operation of the charge pump circuit.

[0099] In one example, see Figure 11 The buck-boost converter circuit 12 includes a voltage conversion bridge 121 and a second output capacitor C4. The input end of the voltage conversion bridge 121 is electrically connected to the output end of the charge pump circuit 11, and the output end of the voltage conversion bridge 121 is electrically connected to the output end of the charge pump circuit 11 and the first end of the second output capacitor C4, respectively. The control end of the voltage conversion bridge 121 is used to receive a control signal; the second end of the second output capacitor C4 is grounded; and the voltage conversion bridge 121 is used to output a target voltage higher or lower than the received input voltage when receiving the control signal. In this way, in this example, by providing the voltage conversion bridge 121, the output voltage of the charge pump circuit 11 can be increased (such as in Boost mode) or decreased (such as in Buck mode), thereby achieving the effect of outputting a stable target voltage Vload.

[0100] Continue to see Figure 11 The voltage conversion bridge 121 includes a tenth switching device Q10, an eleventh switching device Q11, a twelfth switching device Q12, a thirteenth switching device Q13 and a first inductor L;

[0101] A first end of the tenth switching device Q10 is electrically connected to the input end of the voltage conversion bridge 121, and a second end of the tenth switching device Q10 is electrically connected to the first end of the first inductor L and the first end of the twelfth switching device Q12 respectively; a second end of the twelfth switching device Q12 is grounded GND;

[0102] A first end of the eleventh switching device Q11 is electrically connected to the second output capacitor C4 and the output end of the voltage conversion circuit, respectively. A second end of the eleventh switching device Q11 is electrically connected to the second end of the first inductor L and the first end of the thirteenth switching device Q13, respectively. A second end of the thirteenth switching device Q13 is grounded.

[0103] The control terminals of the tenth switching device Q10 , the eleventh switching device Q11 , the twelfth switching device Q12 and the thirteenth switching device Q13 receive a control signal;

[0104] The first inductor L is used to charge when the tenth switching device Q10 and the thirteenth switching device Q13 are switched to the on state, and to discharge when the tenth switching device Q10 and the eleventh switching device Q11 are switched to the on state. At this time, the voltage conversion bridge 121 operates in the Boost mode, and its output voltage is V1+VL.

[0105] The first inductor L is used to charge when the tenth switching device Q10 and the thirteenth switching device Q13 are switched to the on state, and to discharge when the eleventh switching device Q11 and the twelfth switching device Q12 are switched to the on state. At this time, the voltage conversion bridge 121 operates in the Buck mode, and its output voltage is VL.

[0106] In one embodiment, see Figure 12 The buck-boost converter circuit 12 also includes a second control circuit 122; the second control circuit 122 is used to generate the control signal required by the voltage conversion bridge based on the voltage conversion ratio and the target voltage. It is understood that when determining the voltage conversion ratio, the second control circuit 122 can determine the output voltage of the charge pump circuit, and then determine the input voltage and output voltage of the voltage conversion bridge based on this output voltage. When the input voltage is greater than or equal to the output voltage, the circuit can switch to Buck mode; when the input voltage is less than the output voltage, the circuit can switch to Boost mode, thereby achieving the effect of adjusting the operating mode and output voltage of the voltage conversion bridge 121.

[0107] The following describes the operation of a voltage conversion circuit in an electronic device, assuming that the charge pump circuit has two voltage conversion ratios: 1:1 and 1.5:1. Assuming the battery voltage of the electronic device varies between 4.5V and 3.0V, the charge pump circuit's output voltage in the 1.5:1 mode is 6.75-4.5V. The charge pump circuit has a relatively high conversion efficiency, reaching 98% to 99%. The buck-boost converter circuit 12 takes the output voltage of the charge pump circuit as input and outputs a target voltage Vload of 4.6V. This target voltage Vload can be used as the display drive voltage ELVDD.

[0108] As the battery voltage gradually decreases during use, the gap between the battery voltage and ELVDD 4.6V becomes increasingly larger, as shown in Table 1.

[0109] Table 1 Voltage relationship table

[0110]

[0111] When the battery voltage falls below 3.7V, the charge pump circuit switches to a 1.5:1 operating mode. The input voltage of the buck-boost converter circuit 12 decreases from 4.6V, with the worst efficiency point occurring when the battery voltage is approximately 0.9V below ELVDD. In this example, the input-output voltage difference of the buck-boost converter circuit 12 is small, significantly improving power supply efficiency compared to a direct connection to the battery voltage.

[0112] Figure 13 1 is a block diagram of an electronic device according to an exemplary embodiment. For example, the electronic device 1300 may be a smartphone, a computer, a digital broadcast terminal, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0113] The electronic device may include Figures 1 to 12 In addition to the structure shown, refer to Figure 13 The electronic device 1300 may include one or more of the following components: a processing component 1302 , a memory 1304 , a power component 1306 , a multimedia component 1308 , an audio component 1310 , an input / output (I / O) interface 1312 , a sensor component 1314 , a communication component 1316 , and an image acquisition component 1318 .

[0114] Processing component 1302 generally controls the overall operation of electronic device 1300, such as operations associated with display, phone calls, data communications, camera operation, and recording. Processing component 1302 may include one or more processors 1320 to execute computer programs. Furthermore, processing component 1302 may include one or more modules to facilitate interaction between processing component 1302 and other components. For example, processing component 1302 may include a multimedia module to facilitate interaction between multimedia component 1308 and processing component 1302. In one example, the processing component may include a processor to execute the antenna control method described above.

[0115] The memory 1304 is configured to store various types of data to support operations on the electronic device 1300. Examples of such data include computer programs for any application or method operating on the electronic device 1300, contact data, phone book data, messages, pictures, videos, etc. The memory 1304 can be implemented by any type of volatile or non-volatile storage device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0116] The power supply assembly 1306 provides power to the various components of the electronic device 1300. The power supply assembly 1306 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the electronic device 1300. The power supply assembly 1306 may use the aforementioned voltage conversion circuit to convert the battery voltage to a target voltage, thereby achieving the effect of the battery powering a load (such as a display).

[0117] The multimedia component 1308 includes a screen that provides an output interface between the electronic device 1300 and the target object. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input information from the target object. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor can not only sense the boundaries of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation.

[0118] The audio component 1310 is configured to output and / or input audio file information. For example, the audio component 1310 includes a microphone (MIC), which is configured to receive external audio file information when the electronic device 1300 is in an operating mode, such as a call mode, a record mode, and a voice recognition mode. The received audio file information can be further stored in the memory 1304 or transmitted via the communication component 1316. In some embodiments, the audio component 1310 also includes a speaker for outputting the audio file information.

[0119] The I / O interface 1312 provides an interface between the processing component 1302 and a peripheral interface module, such as a keyboard, a click wheel, a button, etc.

[0120] Sensor assembly 1314 includes one or more sensors for providing various status assessments for electronic device 1300. For example, sensor assembly 1314 can detect the open / closed state of electronic device 1300, the relative positioning of components, such as the display screen and keypad of electronic device 1300. Sensor assembly 1314 can also detect changes in the position of electronic device 1300 or a component, the presence or absence of contact between a target object and electronic device 1300, the orientation or acceleration / deceleration of electronic device 1300, and changes in the temperature of electronic device 1300. In this example, sensor assembly 1314 may include a magnetic sensor, a gyroscope, and a magnetic field sensor, and may also include an inertial sensor, an image sensor, etc., wherein the magnetic field sensor includes at least one of the following: a Hall effect sensor, a thin-film magnetoresistive sensor, and a magnetic fluid acceleration sensor.

[0121] The communication component 1316 is configured to facilitate wired or wireless communication between the electronic device 1300 and other devices. The electronic device 1300 can access a wireless network based on a communication standard, such as WiFi, 2G, 3G, 4G, 5G, or a combination thereof. In an exemplary embodiment, the communication component 1316 receives broadcast information or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 1316 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0122] In an exemplary embodiment, the electronic device 1300 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0123] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the present disclosure. This disclosure is intended to cover any variations, uses, or adaptations that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

[0124] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A voltage conversion circuit, characterized in that: The voltage conversion circuit includes: a charge pump circuit and a buck-boost conversion circuit; the input end of the charge pump circuit is electrically connected to the battery, the output end of the charge pump circuit is electrically connected to the input end of the buck-boost conversion circuit; the output end of the buck-boost conversion circuit is electrically connected to the load; The charge pump circuit is used to adjust its own output voltage according to the input voltage and output voltage of the buck-boost conversion circuit; The buck-boost conversion circuit is used to generate a target voltage required by the load according to the output voltage of the charge pump circuit.

2. The voltage conversion circuit according to claim 1, wherein: The voltage conversion ratio of the charge pump circuit includes at least one of the following: 1:1, 1.5:1, or 2:1; The voltage conversion ratio refers to the ratio of the output voltage to the input voltage of the charge pump circuit.

3. The voltage conversion circuit according to claim 2, wherein: When the voltage conversion ratio of the charge pump circuit is 1:1, the charge pump circuit includes a first switching device and a first output capacitor; A first end of the first switching device is electrically connected to the output end of the charge pump circuit, a second end of the first switching device is electrically connected to the first end of the first output capacitor and the output end of the charge pump circuit respectively, and a control end of the first switching device is used to receive a control signal; The second end of the first output capacitor is grounded; The first switching device is configured to switch to an on state when receiving a control signal to conduct electricity between the first end of the charge pump circuit and the first end of the first output capacitor; and the first switching device is configured to switch to an off state when not receiving a control signal to disconnect the first end of the charge pump circuit and the first end of the first output capacitor; The first output capacitor is used to charge when the first switching device is switched to the on state, and is also used to discharge when the first switching device is switched to the off state.

4. The voltage conversion circuit according to claim 2, wherein: When the voltage conversion ratio of the charge pump circuit is 1.5:1, the charge pump circuit includes a second switching device, a third switching device, a fourth switching device, a fifth switching device, a sixth switching device, a seventh switching device, an eighth switching device, a first capacitor, a second capacitor and a first output capacitor; a first end of the second switching device electrically connected to the output end of the charge pump circuit, a second end of the second switching device electrically connected to the first end of the first capacitor, the first end of the third switching device, and the first end of the fourth switching device, respectively, and a control end of the second switching device configured to receive a control signal; The first end of the third switching device is electrically connected to the first end of the first output capacitor and the output end of the charge pump circuit respectively, and the control end of the third switching device is used to receive a control signal; the second end of the first output capacitor is grounded; The second end of the fourth switching device is electrically connected to the second end of the fifth switching device and the first end of the second capacitor respectively, and the control end of the fourth switching device is used to receive a control signal; The first end of the fifth switching device is electrically connected to the second end of the first capacitor and the second end of the seventh switching device respectively, and the control end of the fifth switching device is used to receive a control signal; a first end of the eighth switching device is electrically connected to the first end of the seventh switching device and the input end of the charge pump circuit, respectively; a second end of the eighth switching device is electrically connected to the second end of the second capacitor and the first end of the sixth switching device, respectively; a control end of the eighth switching device is configured to receive a control signal; and a second end of the sixth switching device is grounded; The second switching device, the third switching device, the fourth switching device, the fifth switching device, the sixth switching device, the seventh switching device, and the eighth switching device are configured to switch to an on state when receiving a control signal, and also to switch to an off state when not receiving a control signal; The first capacitor and the second capacitor are used to charge in series when the second switching device, the fifth switching device and the sixth switching device are switched to the on state, and are also used to discharge in parallel when the seventh switching device, the eighth switching device and the third switching device are switched to the off state.

5. The voltage conversion circuit according to claim 4, wherein: When the voltage conversion ratio of the charge pump circuit is 2:1, the charge pump circuit includes a ninth switching device; a second end of the ninth switching device is electrically connected to the second end of the first capacitor, the first end of the fifth switching device, and the second end of the seventh switching device, respectively; a first end of the ninth switching device is grounded; and a control end of the ninth switching device is configured to receive a control signal; The ninth switching device is configured to switch to an on state when receiving a control signal, and switch to an off state when not receiving a control signal; The first capacitor and the second capacitor are also used to charge in parallel when the second switching device, the ninth switching device, the fourth switching device and the sixth switching device are switched to the on state, and are also used to discharge in parallel when the seventh switching device, the eighth switching device and the third switching device are switched to the off state.

6. The voltage conversion circuit according to any one of claims 1 to 5, characterized in that: The charge pump circuit further includes a first control circuit, the first control circuit being electrically connected to the input terminal and the output terminal of the buck-boost converter circuit respectively and also being electrically connected to a switch device in the charge pump circuit; The first control circuit is used to determine the voltage conversion ratio of the charge pump circuit according to the input voltage and output voltage of the buck-boost conversion circuit, and output a control signal to the switching device in the charge pump circuit according to the voltage conversion ratio.

7. The voltage conversion circuit according to claim 6, wherein: The first control circuit includes a first comparator, a first voltage divider circuit, a second comparator, a second voltage divider circuit, a third comparator, a third voltage divider circuit, a time signal generator and a control signal generator; A first end of the first voltage divider circuit is electrically connected to the output end of the buck-boost conversion circuit, a second end of the first voltage divider circuit is grounded, and a voltage divider end of the first voltage divider circuit is electrically connected to the first input end of the first comparator; The second input terminal of the first comparator is electrically connected to the output terminal of the charge pump circuit, and the output terminal of the first comparator is electrically connected to the first input terminal of the control signal generator; A first end of the second voltage divider circuit is electrically connected to the output end of the buck-boost conversion circuit, a second end of the second voltage divider circuit is grounded, and a voltage divider end of the second voltage divider circuit is electrically connected to the first input end of the second comparator; The second input terminal of the second comparator is electrically connected to the output terminal of the charge pump circuit, and the output terminal of the second comparator is electrically connected to the second input terminal of the control signal generator; A first end of the third voltage divider circuit is electrically connected to the output end of the buck-boost conversion circuit, a second end of the third voltage divider circuit is grounded, and a voltage divider end of the third voltage divider circuit is electrically connected to the first input end of the third comparator; The second input terminal of the third comparator is electrically connected to the output terminal of the charge pump circuit, and the output terminal of the third comparator is electrically connected to the third input terminal of the control signal generator; The fourth input terminal of the control signal generator is electrically connected to the output terminal of the time signal generator, and the control signal generator is used to determine the target voltage conversion ratio based on the input signals of the first input terminal, the second input terminal and the third input terminal, and generate the control signal required for the target voltage conversion ratio based on the clock signal output by the time signal generator.

8. The voltage conversion circuit according to claim 1, wherein: The buck-boost conversion circuit includes a voltage conversion bridge and a second output capacitor, wherein the input end of the voltage conversion bridge is electrically connected to the output end of the charge pump circuit, and the output end of the voltage conversion bridge is electrically connected to the output end of the charge pump circuit and the first end of the second output capacitor, respectively; the control end of the voltage conversion bridge is used to receive a control signal; and the second end of the second output capacitor is grounded; The voltage conversion bridge is configured to output a target voltage higher or lower than a received input voltage upon receiving a control signal.

9. The voltage conversion circuit according to claim 8, wherein: The voltage conversion bridge includes a tenth switching device, an eleventh switching device, a twelfth switching device, a thirteenth switching device and a first inductor; The first end of the tenth switching device is electrically connected to the input end of the voltage conversion bridge, the second end of the tenth switching device is electrically connected to the first end of the first inductor and the first end of the twelfth switching device respectively; the second end of the twelfth switching device is grounded; The first end of the eleventh switching device is electrically connected to the second output capacitor and the output end of the voltage conversion circuit respectively, and the second end of the eleventh switching device is electrically connected to the second end of the first inductor and the first end of the thirteenth switching device respectively; the second end of the thirteenth switching device is grounded; Control terminals of the tenth switching device, the eleventh switching device, the twelfth switching device, and the thirteenth switching device receive a control signal; The first inductor is configured to charge when the tenth switching device and the thirteenth switching device are switched to the on state, and discharge when the tenth switching device and the eleventh switching device are switched to the on state; The first inductor is configured to charge when the tenth switching device and the thirteenth switching device are switched to the on state, and discharge when the eleventh switching device and the twelfth switching device are switched to the on state.

10. The voltage conversion circuit according to claim 8 or 9, characterized in that: The buck-boost conversion circuit further includes a second control circuit; the second control circuit is configured to generate a control signal required by the voltage conversion bridge according to a voltage conversion ratio and a target voltage.

11. An electronic device, characterized in that: comprising a battery, a voltage conversion circuit according to any one of claims 1 to 10, and a load; The voltage conversion circuit is used to convert the voltage of the battery into a target voltage required by the load.

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