A charge pump circuit, chip and electronic device

Abstract

The application provides a charge pump circuit, a chip and an electronic device, and belongs to the technical field of electronics. The charge pump circuit comprises a comparator module, a switch module, a first charge pump module and a second charge pump module; a first input end of the comparator module is used for receiving an input signal, a second input end is used for receiving a first reference voltage, and an output end is connected with the switch module; the switch module is arranged between an input end and an output end of the first charge pump module; an output end of the first charge pump module is connected with an input end of the second charge pump module; and an output end of the second charge pump module is used for outputting a target voltage. By using the application, the charge pump circuit can be applied to a low-voltage input scene.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and in particular to a charge pump circuit, chip, and electronic device. Background Technology

[0002] Traditional high-side driven bootstrap charge pumps typically use a single-stage charge pump to boost the voltage, outputting a higher voltage to meet the voltage requirements of subsequent circuits.

[0003] However, in low-voltage input scenarios (such as 2V~5V), traditional high-side driven bootstrap charge pumps may face the problem of insufficient voltage boost, resulting in a low output voltage that fails to reach the target voltage and cannot meet the voltage requirements. For example, they cannot meet the gate drive requirements of high-side MOSFETs (Metal-Oxide Semiconductor Field Effect Transistors) / IGBTs (Insulated-Gate Bipolar Transistors).

[0004] Therefore, there is an urgent need for a charge pump circuit that can be applied in low-voltage input scenarios. Utility Model Content

[0005] To address the problems of existing technologies, this application provides a charge pump circuit, a chip, and an electronic device. This charge pump circuit can be applied to low-voltage input scenarios. The technical solution is as follows: According to one aspect of this application, a charge pump circuit is provided, the charge pump circuit including a comparator module, a switch module, a first charge pump module and a second charge pump module; The first input terminal of the comparator module is used to receive the input signal, the second input terminal is used to receive the first reference voltage, and the output terminal is connected to the switch module. The switch module is located between the input and output terminals of the first charge pump module; The output terminal of the first charge pump module is connected to the input terminal of the second charge pump module; The output terminal of the second charge pump module is used to output the target voltage.

[0006] According to another aspect of this application, a chip is provided that includes the above-described charge pump circuit.

[0007] According to another aspect of this application, an electronic device is provided, including the charge pump circuit described above.

[0008] In this application, the charge pump circuit includes a comparator module, a switching module, a first charge pump module, and a second charge pump module. The switching module is located between the input and output terminals of the first charge pump module, and the comparator module compares the input signal with a first reference voltage. In low-voltage input scenarios, the switching module is turned off, and the first and second charge pump modules can be used simultaneously for voltage boosting to output a target voltage that meets the voltage requirements, thereby solving the problem of insufficient voltage boosting in low-voltage input scenarios for single-stage charge pump circuits. Attached Figure Description

[0009] Further details, features, and advantages of this application are disclosed in the following description of exemplary embodiments in conjunction with the accompanying drawings, in which: Figure 1 A schematic diagram of a charge pump circuit provided according to an exemplary embodiment of this application is shown; Figure 2 A schematic diagram of another charge pump circuit provided according to an exemplary embodiment of this application is shown; Figure 3 A schematic diagram of a first charge pump module provided according to an exemplary embodiment of this application is shown; Figure 4 This diagram illustrates the connection relationship between an LDO module and a first charge pump module according to an exemplary embodiment of this application. Figure 5 This diagram illustrates the connection relationship between the comparator module and the first charge pump module according to an exemplary embodiment of this application. Figure 6 A schematic diagram of a second charge pump module provided according to an exemplary embodiment of this application is shown; Figure 7 A schematic diagram showing the connection relationship between the second charge pump module and the energy storage module provided according to an exemplary embodiment of this application is shown; Figure 8 A schematic diagram of an energy storage module provided according to an exemplary embodiment of this application is shown.

[0010] In the picture, 1. Comparator module; 2. Switching module; 3. First charge pump module; 31. Flying capacitor unit; 32. Switching unit; 4. Second charge pump module; 5. LDO module; 6. Energy storage module. Detailed Implementation

[0011] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0012] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc., mentioned in this application are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0013] Furthermore, in the embodiments of this application, "multiple" refers to two or more. Therefore, in the embodiments of this application, "multiple" can also be understood as "at least two". "At least one" can be understood as one or more, such as one, two, or more. For example, including at least one means including one, two, or more, and is not limited to which ones are included. For example, including at least one of A, B, and C, then it could include A, B, C, A and B, A and C, B and C, or A and B and C.

[0014] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0015] The names of the messages or information exchanged between multiple devices in the embodiments of this application are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0016] This application provides a charge pump circuit that can be integrated into a chip or disposed in an electronic device.

[0017] Reference Figure 1 The schematic diagram of the charge pump circuit shown can include a comparator module 1, a switch module 2, a first charge pump module 3, and a second charge pump module 4.

[0018] The first input terminal of comparator module 1 is used to receive the input signal, the second input terminal is used to receive the first reference voltage, and the output terminal is connected to switch module 2; The switch module 2 is located between the input and output terminals of the first charge pump module 3; The output terminal of the first charge pump module 3 is connected to the input terminal of the second charge pump module 4; The output of the second charge pump module 4 is used to output the target voltage.

[0019] In one possible implementation, the first reference voltage can be preset to distinguish between low-voltage input scenarios and high-voltage input scenarios. For example, the first reference voltage can be 3V. This embodiment does not limit the specific value of the first reference voltage.

[0020] When the comparator module 1 receives the input signal from the charge pump circuit, it can compare the input signal with the first reference voltage and output the corresponding comparison result.

[0021] When the input signal is less than or equal to the first reference voltage, indicating a low-voltage input scenario, comparator module 1 outputs a corresponding first comparison result and transmits it to switch module 2. Switch module 2, controlled by this first comparison result, turns off, allowing the first charge pump module 3 to connect to the circuit and begin boost operation. In other words, in a low-voltage input scenario, both the first charge pump module 3 and the second charge pump module 4 can be used simultaneously to boost the voltage, outputting a target voltage that meets the voltage requirements, thus solving the problem of insufficient boost voltage from a single-stage charge pump circuit in low-voltage input scenarios.

[0022] When the input signal exceeds the first reference voltage, indicating a high-voltage input scenario, comparator module 1 outputs a second comparison result and transmits it to switch module 2. Switch module 2 is then turned on under the control of this second comparison result, preventing the first charge pump module 3 from being connected to the circuit for voltage boosting. In other words, in a high-voltage input scenario, only the second charge pump module 4 needs to be used for boosting to output the target voltage that meets the requirements. This reduces the losses from capacitor charging and discharging in the first charge pump module 3, thus lowering the static power consumption of the charge pump circuit.

[0023] Optional, refer to Figure 2 The schematic diagram of the charge pump circuit shown may also include an LDO (Low Dropout Regulator) module 5.

[0024] The first input terminal of LDO module 5 is used to receive the input signal, the second input terminal is used to receive the second reference voltage, and the output terminal is connected to the input terminal of the first charge pump module 3.

[0025] In one possible implementation, an LDO module 5 can be provided before the first charge pump module 3 or the second charge pump module 4 is used for voltage boosting. In the LDO module 5, upon receiving an input signal from the charge pump circuit, the input signal can be processed based on a second reference voltage to output a stable first voltage. This embodiment does not limit the specific circuit structure of the LDO module.

[0026] When the aforementioned switch module 2 is in the off state, the first voltage output by the LDO module 5 can be transmitted to the first charge pump module 3. The first charge pump module 3 can boost the first voltage to output a second voltage, which is then transmitted to the second charge pump module 4. The second charge pump module 4 can boost the second voltage to output the target voltage.

[0027] When the aforementioned switch module 2 is in the closed state, the first voltage output by the LDO module 5 can be transmitted to the second charge pump module 4. The second charge pump module 4 can boost the first voltage to output the target voltage.

[0028] Optional, refer to Figure 3 The schematic diagram of the first charge pump module shown is shown. The first charge pump module 3 includes a flying capacitor unit 31.

[0029] When the switch module 2 is in the closed state, the flying capacitor unit 31 is applied to the LDO module 5.

[0030] In one possible implementation, when switch module 2 is in the closed state, the first charge pump module 3 is not connected to the circuit for boost operation. At this time, since switch module 2 is in the closed state, the flying capacitor unit 31 can be used as an output voltage regulator capacitor for the LDO module 5. This improves capacitor utilization.

[0031] As a concrete example, Figure 4 A schematic diagram showing the connection relationship between an LDO module and a first charge pump module is provided. The diagram illustrates a specific LDO circuit and charge pump circuit. Figure 4 In this embodiment, an additional switching unit 32 can be provided between the output terminal of the first charge pump module 3 and the two flying capacitor units 31. When the switching module 2 is closed, the two switching units 32 are controlled to close, and one end of the two flying capacitor units 31 is grounded to GND. At this time, the two flying capacitor units 31 of the first charge pump module 3 can be used as output voltage regulators of the LDO module. Figure 4 Circuit units not covered in this article will not be described in detail.

[0032] Of course, when applying other specific charge pump circuits, other specific implementation methods can be adopted so that the flying capacitor unit 31 can be used as the output voltage regulator capacitor of the LDO module 5. This embodiment does not limit this.

[0033] Optional, refer to Figure 5 The diagram shows the connection relationship between the comparator module and the first charge pump module. The output terminal of the comparator module 1 is also connected to the enable control terminal of the first charge pump module 3.

[0034] In one possible implementation, when comparator module 1 outputs the first comparison result, it can also transmit the first comparison result to the enable control terminal of the first charge pump module 3. Under the control of the first comparison result, the first charge pump module 3 is enabled and performs boost operation. When comparator module 1 outputs the second comparison result, it can also transmit the second comparison result to the enable control terminal of the first charge pump module 3. Under the control of the second comparison result, the first charge pump module 3 is not operating. In this case, the operating logic of the first charge pump module 3 can be guaranteed, further improving the reliability of the circuit.

[0035] Optional, refer to Figure 6 The schematic diagram of the second charge pump module is shown. The voltage input port of the second charge pump module 4 is used to receive input signals.

[0036] In one possible implementation, the input signal can be connected to the voltage input port of the second charge pump module 4. Upon receiving the input signal, the second charge pump module 4 can use the input signal as a reference and perform voltage boosting based on it. As a specific example, if the input signal is used as VBST, and the first voltage output by the LDO module 5 is used as the voltage LVDD, the first charge pump module 3 can boost it by 2 times to output a second voltage LVDD*2. Then, the input signal VBST can be connected to the voltage input port of the second charge pump module 4. In the case of low voltage input, the second charge pump module 4 can boost the voltage to VBST+LVDD*2 based on VBST, and in the case of high voltage input, it can boost the voltage to VBST+LVDD based on VBST.

[0037] Optionally, the first charge pump module 3 may include low-voltage devices, and the second charge pump module 4 may include high-voltage devices. That is, the first charge pump module 3 can use low-voltage devices and is a low-voltage module; the second charge pump module 4 can use high-voltage devices and is a high-voltage module. In this case, the first charge pump module 3, which uses low-voltage devices, can reduce impedance and further reduce circuit area.

[0038] It should be noted that the first charge pump module 3 and the second charge pump module 4 can use existing charge pump circuit structures to realize the charge pump-related boost function. This embodiment does not limit the specific charge pump circuit structure.

[0039] Optionally, the second charge pump module 4 may include at least one stage of charge pump unit. That is, the second charge pump module 4 may include one stage of high-voltage charge pump unit, or it may include multiple stages of high-voltage charge pump units to meet different voltage boosting requirements.

[0040] Optional, refer to Figure 7 The diagram shows the connection between the second charge pump module and the energy storage module. The charge pump circuit may also include an energy storage module 6. The first terminal of the energy storage module 6 is used to receive the input signal, and the second terminal is connected to the output terminal of the second charge pump module 4.

[0041] Optional, refer to Figure 8 The schematic diagram of the energy storage module shown indicates that the energy storage module 6 may include an energy storage capacitor unit CL.

[0042] The embodiments of this application can achieve the following beneficial effects: (1) The charge pump circuit includes a comparator module, a switch module, a first charge pump module, and a second charge pump module. The switch module is located between the input and output terminals of the first charge pump module. The input signal and the first reference voltage are compared by the comparator module. In the case of low-voltage input, the switch module is turned off, and the first and second charge pump modules can be used simultaneously to boost the voltage and output the target voltage that meets the voltage requirements, so as to solve the problem of insufficient boost voltage of the single-stage charge pump circuit in the case of low-voltage input.

[0043] (2) In the case of high voltage input, the switch module is closed, and only the second charge pump module can be used to boost the voltage, thereby reducing the static power consumption of the charge pump circuit.

[0044] (3) When the switch module is in the closed state, the flying capacitor unit in the first charge pump module is used as an output voltage regulator capacitor of the LDO module to improve the utilization rate of the capacitor.

[0045] An exemplary embodiment of this application also provides a chip including the charge pump circuit provided in the embodiments of this application. The charge pump circuit includes a comparator module, a switching module, a first charge pump module, and a second charge pump module. The switching module is disposed between the input terminal and the output terminal of the first charge pump module, and the comparator module compares the input signal with a first reference voltage. In a low-voltage input scenario, the switching module is turned off, and the first charge pump module and the second charge pump module can be used simultaneously for voltage boosting to output a target voltage that meets the voltage requirements, thereby solving the problem of insufficient voltage boosting by a single-stage charge pump circuit in a low-voltage input scenario.

[0046] An exemplary embodiment of this application also provides an electronic device including the charge pump circuit provided in the embodiments of this application. The charge pump circuit includes a comparator module, a switching module, a first charge pump module, and a second charge pump module. The switching module is disposed between the input terminal and the output terminal of the first charge pump module, and the comparator module compares the input signal with a first reference voltage. In a low-voltage input scenario, the switching module is turned off, and the first charge pump module and the second charge pump module can be used simultaneously for voltage boosting to output a target voltage that meets the voltage requirements, thereby solving the problem of insufficient voltage boosting by a single-stage charge pump circuit in a low-voltage input scenario.

[0047] The charge pump circuit, chip, and electronic device provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A charge pump circuit, characterized in that, The charge pump circuit includes a comparator module, a switch module, a first charge pump module, and a second charge pump module. The first input terminal of the comparator module is used to receive the input signal, the second input terminal is used to receive the first reference voltage, and the output terminal is connected to the switch module. The switch module is located between the input and output terminals of the first charge pump module; The output terminal of the first charge pump module is connected to the input terminal of the second charge pump module; The output terminal of the second charge pump module is used to output the target voltage.

2. The charge pump circuit according to claim 1, characterized in that, The charge pump circuit also includes a low-dropout linear regulator (LDO) module. The first input terminal of the LDO module is used to receive the input signal, the second input terminal is used to receive the second reference voltage, and the output terminal is connected to the input terminal of the first charge pump module.

3. The charge pump circuit according to claim 2, characterized in that, The first charge pump module includes a flying capacitor unit; When the switch module is in the closed state, the flying capacitor unit is applied to the LDO module.

4. The charge pump circuit according to claim 1, characterized in that, The output of the comparator module is also connected to the enable control terminal of the first charge pump module.

5. The charge pump circuit according to claim 1, characterized in that, The voltage input port of the second charge pump module is used to receive the input signal.

6. The charge pump circuit according to claim 1, characterized in that, The first charge pump module includes low-voltage devices, and the second charge pump module includes high-voltage devices.

7. The charge pump circuit according to claim 1, characterized in that, The second charge pump module includes at least one charge pump unit.

8. The charge pump circuit according to claim 1, characterized in that, The charge pump circuit also includes an energy storage module; The first end of the energy storage module is used to receive the input signal, and the second end is connected to the output end of the second charge pump module.

9. The charge pump circuit according to claim 8, characterized in that, The energy storage module includes an energy storage capacitor unit.

10. A chip, characterized in that, Includes the charge pump circuit as described in any one of claims 1-9.

11. An electronic device, characterized in that, Includes the charge pump circuit as described in any one of claims 1-9.

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