Power Fast Wake-up Circuit and Method

Abstract

The present invention provides a power supply fast wake-up circuit and method. The power supply fast wake-up circuit includes: a first voltage regulation module, a second voltage regulation module, a first switch, a second switch, a third switch, a first capacitor, a first system and a second system; when switching from a low-power mode to a high-performance mode, the establishment of the first reference voltage and the establishment of the input voltage of the first voltage regulation module are carried out simultaneously, without waiting for the establishment of the first reference voltage with higher precision, thereby shortening the switching time of the entire system from the low-power mode to the high-performance mode; the present invention uses a simple switching circuit to control the switching switch, the circuit structure is simple, and no major modification is required for the original circuit structure.

Description

Technical Field

[0001] The present invention relates to the field of circuit design, and particularly to a power supply fast wake-up circuit and method. Background Art

[0002] In recent years, with the rise of smart life, the functional requirements for consumer electronics products have become higher and higher, the design has become more and more complex, and the power consumption has also increased accordingly. Therefore, the ability to control the power consumption of electronic products has also become higher and higher. In order to minimize the power consumption of the controller, it is mainly achieved through the following three methods: reducing the power consumption in the high-performance mode, reducing the power consumption in the low-power mode, and shortening the wake-up time from the low-power mode to the high-performance mode.

[0003] Regarding the solution to shorten the wake-up time from the low-power mode to the high-performance mode, when the MCU is in the low-power mode, most of the systems in the MCU will be turned off, leaving only a very small part of the circuit working or in a low-power working state; when the MCU is in the high-performance mode, most of the systems in the MCU will work; when the MCU needs to switch from the low-power mode to the high-performance mode, due to reasons such as power supply establishment, the circuit startup time is usually relatively long, and the system establishment speed is slow.

[0004] Therefore, how to propose a fast wake-up system solution with a short startup time has become one of the problems that need to be urgently solved by those skilled in the art. Summary of the Invention

[0005] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a power supply fast wake-up circuit and method, which are used to solve the problems of long circuit startup time and slow system establishment speed when switching from the low-power mode to the high-performance mode in the prior art.

[0006] To achieve the above object and other related objects, the present invention provides a power supply fast wake-up circuit, which includes: a first voltage stabilization module, a second voltage stabilization module, a first switch, a second switch, a third switch, a first capacitor, a first system and a second system; the first voltage stabilization module receives the first reference voltage through the first switch and receives the second reference voltage through the second switch, the first voltage stabilization module generates a first voltage based on the first reference voltage and generates a third voltage based on the second reference voltage; the control end of the first switch is connected to a first control signal, and the control end of the second switch is connected to the second control signal; the second voltage stabilization module receives the second reference voltage and generates a second voltage based on the second reference voltage; the first system is connected to the output end of the first voltage stabilization module and is connected to the output end of the second voltage stabilization module through the third switch; the second system is connected to the output end of the second voltage stabilization module; one end of the first capacitor is connected to the output end of the first voltage stabilization module, and the other end is grounded.

[0007] Optionally, the power supply fast wake-up circuit further includes a control module, and the control module generates the first control signal and the second control signal based on a clock signal and a working mode switching signal.

[0008] Optionally, the working mode switching signal includes: a low-power to high-performance mode switching signal, and a high-performance to low-power mode switching signal.

[0009] Optionally, the states of the first switch and the second switch are opposite.

[0010] The present invention also provides a power supply fast wake-up method, including the following steps:

[0011] S1: Receive a low-power to high-performance mode switching signal, turn on the third switch, and turn on the working states of the first reference voltage and the first voltage stabilizing module. The first voltage stabilizing module generates a third voltage based on a second reference voltage, and the second voltage stabilizing module generates a second voltage based on the second reference voltage. Charge the first capacitor with the second voltage and the third voltage;

[0012] S2: After the first capacitor is fully charged, the first system starts to start, turn off the first switch, turn on the second switch, and switch the input of the first voltage stabilizing module from the second reference voltage to the first reference voltage. The first voltage stabilizing module generates a first voltage based on the first reference voltage, and the first system and the second system enter the high-performance working mode based on the first voltage.

[0013] Optionally, when in the low-power mode, the second switch is turned on, the first switch and the third switch are turned off, the second voltage stabilizing module outputs a second voltage based on the second reference voltage, and the second system is in the low-power working state based on the second voltage; the input voltage of the first voltage stabilizing module is the second reference voltage, the working state of the first voltage stabilizing module is turned off, no voltage is output, and the first system does not work due to no voltage input; no charge is accumulated in the first capacitor.

[0014] Optionally, when in the high-performance mode, the first switch and the third switch are turned on, the second switch is turned off, the second voltage stabilizing module outputs a second voltage based on the second reference voltage, and the first voltage stabilizing module outputs a first voltage based on the first reference voltage. Both the first system and the second system are in the high-performance working state based on the first voltage.

[0015] As described above, a power supply fast wake-up circuit and method of the present invention have the following beneficial effects:

[0016] While meeting two typical application environments of the MCU, a simple switching circuit is used to control the switching switch to solve the problem of slow wake-up. The circuit structure is simple and does not require major modification to the original circuit structure. Brief Description of the Drawings

[0017] Figure 1 It is shown as a schematic diagram of the power supply fast wake-up circuit of the present invention.

[0018] Description of Component Labels

[0019] 11 Control module

[0020] 12 First voltage stabilization module

[0021] 13 First system

[0022] 14 Second voltage stabilization module

[0023] 15 Second system

[0024] Steps S1 to S2 Detailed Implementation Modes

[0025] The following uses specific specific examples to illustrate the implementation modes of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0026] Please refer to Figure 1 . It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components during actual implementation. The types, quantities, and proportions of the components during actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0027] Embodiment 1

[0028] As Figure 1 shown, this embodiment provides a power supply fast wake-up circuit including: a first voltage stabilization module 12, a second voltage stabilization module 14, a first switch S1, a second switch S2, a third switch S3, a first capacitor C1, a first system 13, and a second system 15.

[0029] Specifically, the power supply fast wake-up circuit further includes a control module 11. The control module 11 generates the first control signal and the second control signal based on a clock signal and a working mode switching signal, and the states of the first switch S1 and the second switch S2 are opposite.

[0030] It should be noted that the control module 11 is a switching circuit that controls the states of the first switch S1 and the second switch S2. In different application requirements, as well as in the power-on mode or working mode switching, the first switch S1 and the second switch S2 can have different combination forms with the first voltage stabilizing module 12 and the second voltage stabilizing module 14.

[0031] Specifically, the working mode switching signals include: a low-power to high-performance mode switching signal, and a high-performance to low-power mode switching signal.

[0032] It should be noted that the input signals of the switching circuit include, but are not limited to, the clock signal and the working mode switching signal listed in this embodiment. Any input signal that can achieve controlling the states of the first switch S1 and the second switch S2 by the control module 11 based on the input signal satisfies this invention.

[0033] As Figure 1 shown, the first voltage stabilizing module 12 receives the first reference voltage through the first switch S1 and receives the second reference voltage through the second switch S2. The first voltage stabilizing module 12 generates a first voltage based on the first reference voltage and generates a third voltage based on the second reference voltage. The control end of the first switch S1 is connected to the first control signal, and the control end of the second switch S2 is connected to the second control signal.

[0034] Specifically, the second voltage stabilizing module 14 receives the second reference voltage and generates a second voltage based on the second reference voltage.

[0035] As Figure 1 shown, the first system 13 is connected to the output end of the first voltage stabilizing module 12 and is connected to the output end of the second voltage stabilizing module 14 through the third switch S3.

[0036] As Figure 1 shown, the second system 15 is connected to the output end of the second voltage stabilizing module 14.

[0037] It should be noted that the control method of the third switch S3 is not limited here. Any method that can be switched according to the working mode switching signal satisfies this invention, and no examples will be given one by one here.

[0038] Specifically, one end of the first capacitor C1 is connected to the output end of the first voltage stabilizing module 12, and the other end is grounded.

[0039] It should be noted that the capacitance value of the first capacitor C1 is not limited here. Any capacitance value that can meet the design requirements of the charging speed according to the system design requirements satisfies this invention.

[0040] Embodiment 2

[0041] This embodiment provides a method for quickly waking up a power supply, which is implemented based on the power supply quick wake-up circuit in Embodiment 1. When switching from the low-power mode to the high-performance mode, the following steps are included:

[0042] S1: Receive the low-power to high-performance mode switching signal, turn on the third switch S3, and turn on the working states of the first reference voltage and the first voltage stabilizing module 12. The first voltage stabilizing module 12 outputs a third voltage based on the second reference voltage, and the second voltage stabilizing module 14 outputs a second voltage based on the second reference voltage. Charge the first capacitor C1 with the second voltage and the third voltage;

[0043] S2: After the first capacitor C1 is fully charged, the first system 13 starts to start, turn off the second switch S2, turn on the first switch S1, switch the input of the first voltage stabilizing module 12 from the second reference voltage to the first reference voltage. The first voltage stabilizing module 12 outputs a first voltage based on the first reference voltage, and the first system 13 and the second system 15 enter the high-performance working state based on the first voltage.

[0044] It should be noted that after the first capacitor C1 is fully charged, the first system 13 starts to start; at this time, the first voltage stabilizing module 12 outputs a third voltage, and the second voltage stabilizing module 14 outputs a second voltage. The magnitudes of the second voltage and the third voltage are not limited; after the first system 13 starts up, the first system 13 works based on the voltage with stronger driving ability among the second voltage and the third voltage.

[0045] Specifically, when in the low-power mode, the second voltage stabilizing module 14 outputs a second voltage based on the second reference voltage, and the second system 15 is in the low-power working state based on the second voltage; the input voltage of the first voltage stabilizing module 12 is the second reference voltage, the working state of the first reference voltage is turned off, the working state of the first voltage stabilizing module 12 is turned off, and no voltage is output. The first system 13 has no voltage input, resulting in the first system 13 not working; no charge is accumulated in the first capacitor C1.

[0046] More specifically, when in the high-performance mode, the second voltage stabilizing module 14 outputs a second voltage based on the second reference voltage, the first voltage stabilizing module 12 outputs a first voltage based on the first reference voltage, and the first system 13 and the second system 15 are in the high-performance working state based on the first voltage.

[0047] It should be noted that the first reference voltage has high precision, so the establishment time of the first reference voltage is relatively long; the first voltage has higher precision and greater driving ability than the second voltage; when in the high-performance mode, the first voltage regulator module 12 outputs the first voltage based on the first reference voltage, and the second voltage regulator module 14 outputs the second voltage based on the second reference voltage. Since the first voltage has higher precision and greater driving ability than the second voltage, the first system 13 and the second system 15 both operate based on the first voltage in the high-performance working state.

[0048] Furthermore, it should be noted that, as an example, in this embodiment, the switching from the low-power mode to the high-performance mode is based on the first switch S1, the second switch S2, and the third switch S3 in Embodiment 1; the switching from the low-power mode to the high-performance mode includes, but is not limited to, the switch modes of the switching circuit in Embodiment 1, and can also be implemented in other ways such as based on timing, software, etc. Moreover, the combination of the first switch S1 and the second switch S2 with the first voltage regulator module 12 and the second voltage regulator module 14 can meet the requirements of rapid switching from the low-power mode to the high-performance mode, and can also meet the switching requirements of other working modes and power-on logics. When switching from the high-performance mode to the low-power mode, first turn off the first switch S1, turn on the second switch S2, and then turn off the third switch S3, so as to switch the input of the first voltage regulator module 12 from the first reference voltage to the second reference voltage.

[0049] Generally, in the low-power mode, the second system 15 is in the low-power working state. When receiving the switching signal from the low-power mode to the high-performance mode, the first voltage regulator module 12 and its first reference voltage both need to be powered on again, and the output voltage is output after the power-on is stable; at this time, the establishment speed of the input voltage of the first voltage regulator module 12 and the establishment speed of the first reference voltage are the bottlenecks for rapid wake-up; in this invention, when switching from the low-power mode to the high-performance mode, the working states of the first reference voltage and the first voltage regulator module 12 are turned on, and at the same time, the third switch S3 is turned on. While the input voltage of the first voltage regulator module 12 is being established, the first reference voltage is being established, and the first capacitor C1 is also being charged; when the first capacitor C1 is fully charged, the establishment of the first reference voltage is completed, and then the input voltage of the first voltage regulator module 12 is switched from the second reference voltage to the first reference voltage; because the establishment of the first reference voltage and the establishment of the input voltage of the first voltage regulator module 12 are carried out simultaneously, rather than establishing the input voltage of the first voltage regulator module 12 based on the first reference voltage after the first reference voltage is established, and there is no need to wait for the establishment of the first reference voltage with higher precision, thus shortening the switching time of the entire system from the low-power mode to the high-performance mode.

[0050] In summary, the present invention provides a power supply fast wake-up circuit and method. The power supply fast wake-up circuit includes: a first voltage stabilization module 12, a second voltage stabilization module 14, a first reference voltage, a second reference voltage, a control module 11, a first switch S1, a second switch S2, a third switch S3, a first capacitor C1, a first system 13, and a second system 15. For the power supply fast wake-up method, the establishment of the first reference voltage and the establishment of the input voltage of the first voltage stabilization module 12 are carried out simultaneously, without waiting for the establishment of the first reference voltage with higher precision, thereby shortening the switching time of the entire system from the low-power mode to the high-performance mode. While meeting the two typical application environments of the MCU, the present invention uses a simple switching circuit and switches to control the switching switch to solve the problem of slow wake-up. The circuit structure is simple and does not require major modifications to the original circuit structure. Therefore, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0051] The above embodiments are only used to exemplarily illustrate the principles and effects of the present invention, rather than to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A power supply fast wake-up circuit, characterized in that: the power supply fast wake-up circuit includes: a first voltage stabilizing module, a second voltage stabilizing module, a first switch, a second switch, a third switch, a first capacitor, a first system and a second system; the first voltage stabilizing module receives a first reference voltage through the first switch and a second reference voltage through the second switch. The first voltage stabilizing module generates a first voltage based on the first reference voltage and a third voltage based on the second reference voltage; the control terminal of the first switch is connected to a first control signal, and the control terminal of the second switch is connected to a second control signal; the second voltage stabilizing module receives the second reference voltage and generates a second voltage based on the second reference voltage; the first system is connected to the output terminal of the first voltage stabilizing module and is connected to the output terminal of the second voltage stabilizing module through the third switch; the second system is connected to the output terminal of the second voltage stabilizing module; one end of the first capacitor is connected to the output terminal of the first voltage stabilizing module, and the other end is grounded.

2. The power supply fast wake-up circuit according to claim 1, characterized in that: the power supply fast wake-up circuit further includes a control module, and the control module generates the first control signal and the second control signal based on a clock signal and a working mode switching signal.

3. The power supply fast wake-up circuit according to claim 2, characterized in that: the working mode switching signal includes: a low-power to high-performance mode switching signal, a high-performance to low-power mode switching signal.

4. The power supply fast wake-up circuit according to any one of claims 1-3, characterized in that: the states of the first switch and the second switch are opposite.

5. A power supply fast wake-up method, implemented based on the power supply fast wake-up circuit according to any one of claims 1-4, characterized in that: includes the following steps: S1: Receive a low-power to high-performance mode switching signal, turn on the third switch, and turn on the working states of the first reference voltage and the first voltage stabilizing module. During the establishment process of the working states of the first reference voltage and the first voltage stabilizing module, the first voltage stabilizing module generates a third voltage based on the second reference voltage, the second voltage stabilizing module generates a second voltage based on the second reference voltage, and charges the first capacitor through the second voltage and the third voltage; S2: When the first capacitor is fully charged, the first system starts to start, the first switch is turned on, the second switch is turned off, the input of the first voltage stabilizing module is switched from the second reference voltage to the first reference voltage, the first voltage stabilizing module generates a first voltage based on the first reference voltage, and the first system and the second system enter the high-performance working mode based on the first voltage.

6. The power supply fast wake-up method according to claim 5, characterized in that: When in the low-power mode, the second switch is turned on, the first switch and the third switch are turned off, the second voltage regulator module outputs a second voltage based on the second reference voltage, and the second system is in the low-power operating state based on the second voltage; the input voltage of the first voltage regulator module is the second reference voltage, the operating state of the first reference voltage is turned off, the operating state of the first voltage regulator module is turned off, no voltage is output, and the first system does not work due to no voltage input; no charge is accumulated in the first capacitor.

7. The power supply fast wake-up method according to claim 5, characterized in that: When in the high-performance mode, the first switch and the third switch are turned on, the second switch is turned off, the second voltage regulator module outputs a second voltage based on the second reference voltage, the first voltage regulator module outputs a first voltage based on the first reference voltage, and both the first system and the second system are in the high-performance operating state based on the first voltage.

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