Power management module and electronic equipment
By designing protection modules and protection units in the power management module, and using field-effect transistors and clamping circuits to regulate voltage, the problem of insufficient PMU protection was solved, and overvoltage protection for functional units was achieved, ensuring the normal operation of electronic equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SMARTER SILICON (SHANGHAI) TECH CO LTD
- Filing Date
- 2025-04-30
- Publication Date
- 2026-05-26
AI Technical Summary
In the existing technology, the protection mechanism of the PMU is insufficient, which makes the components in electronic devices prone to damage due to overvoltage, especially low-voltage components such as digital core circuits, affecting the normal operation of the equipment.
A power management module is designed, comprising a power supply module, a protection module, and a functional unit. The protection module regulates the voltage output through its protection unit and clamping circuit to ensure that the voltage does not exceed the maximum withstand value of the functional unit. This includes voltage regulation using MOSFETs and clamping circuits, and fault detection using a voltage regulator unit and a comparator.
It achieves overvoltage protection for functional units, avoids component damage, and ensures the normal operation of power management modules and electronic devices, especially the protection of low-voltage components.
Smart Images
Figure CN224289274U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electronic device technology, and more particularly to a power management module and an electronic device. Background Technology
[0002] In the power supply architecture of electronic devices, multiple primary power rails are drawn from the main power supply, and multiple secondary power rails may also be drawn from the primary power rails, and so on. However, the voltage of both primary and secondary power rails is obtained by the Power Management Unit (PMU) processing the voltage from the source. Therefore, the PMU has a significant impact on the operation of various components in the electronic device. Consequently, how to protect the PMU has become a key issue for those skilled in the art. Utility Model Content
[0003] In view of this, this application provides a power management module and an electronic device, which can realize overvoltage protection of its internal functional units, as follows:
[0004] A power management module, comprising:
[0005] The power supply module outputs a power supply voltage at its voltage output terminal.
[0006] Protection module;
[0007] First functional unit;
[0008] The protection module is electrically connected between the voltage output terminal of the power supply module and the first functional unit. The protection module provides a first voltage to the first functional unit based on the voltage of the voltage output terminal of the power supply module.
[0009] Wherein, the first voltage is not greater than the maximum voltage that the first functional unit can withstand.
[0010] Optionally, the protection module includes a first protection unit, which is electrically connected between the voltage output terminal of the power supply module and the first functional unit. The first protection unit provides the first voltage to the first functional unit based on the voltage at the voltage output terminal of the power supply module.
[0011] Wherein, the voltage at the voltage output terminal of the power supply module is within a preset range, and the maximum voltage within the preset range is not greater than the maximum voltage that the first functional unit can withstand. The first protection unit provides the first voltage to the first functional unit based on the first voltage drop and the voltage at the voltage output terminal of the power supply module. The first voltage is equal to the difference between the voltage at the voltage output terminal of the power supply module and the first voltage drop; or
[0012] If the voltage at the output terminal of the power supply module exceeds the preset range, the first protection unit provides the first voltage to the first functional unit based on the second voltage drop and the voltage at the output terminal of the power supply module. The first voltage is equal to the difference between the voltage at the output terminal of the power supply module and the second voltage drop.
[0013] Wherein, the second voltage drop is greater than the first voltage drop, and the first voltage drop is less than the first preset value.
[0014] Optionally, the first protection unit includes a first part and a second part;
[0015] The first part is electrically connected between the voltage output terminal of the power supply module and the first functional unit. The first part receives the voltage from the voltage output terminal of the power supply module and outputs the first voltage.
[0016] The second part is electrically connected to the first part, and the second part controls the first part to output the first voltage based on the first voltage drop and the voltage of the voltage output terminal of the power supply module, or the second part controls the first part to output the first voltage based on the second voltage drop and the voltage of the voltage output terminal of the power supply module.
[0017] Optionally, the first part includes a first field-effect transistor, and the second part includes a clamping circuit;
[0018] The first terminal of the first field-effect transistor is electrically connected to the voltage output terminal of the power supply module, and the voltage of the voltage output terminal of the power supply module is input; the second terminal of the first field-effect transistor is electrically connected to the first functional unit, and the first voltage is provided to the first functional unit.
[0019] The clamping circuit is electrically connected to the gate terminal of the first field-effect transistor and controls the gate voltage of the first field-effect transistor to be the second voltage.
[0020] Wherein, based on the second voltage, the voltage at the voltage output terminal of the power supply module is within the preset range, and the first voltage output from the second terminal of the first field-effect transistor is equal to the difference between the voltage at the voltage output terminal of the power supply module and the first voltage drop; or,
[0021] Based on the second voltage, the voltage at the voltage output terminal of the power supply module exceeds the preset range, and the first voltage output from the second terminal of the first field-effect transistor is equal to the difference between the voltage at the voltage output terminal of the power supply module and the second voltage drop.
[0022] Optionally, the clamping circuit includes a second field-effect transistor, a first voltage source, and a second voltage source;
[0023] The gate terminal of the second field-effect transistor is electrically connected to the gate terminal of the first field-effect transistor and is also electrically connected to the first voltage source. The first terminal of the second field-effect transistor is also electrically connected to the first voltage source, and the second terminal of the second field-effect transistor is electrically connected to the second voltage source.
[0024] Wherein, the voltage of the second voltage source is not greater than the maximum voltage that the first functional unit can withstand, and the voltage of the second voltage source is greater than the maximum voltage in the preset range.
[0025] Optionally, the first field-effect transistor is an N-type field-effect transistor, and the second field-effect transistor is an N-type field-effect transistor;
[0026] The drain terminal of the first field-effect transistor is electrically connected to the voltage output terminal of the power supply module, the source terminal of the first field-effect transistor is electrically connected to the first functional unit, and the gate terminal of the first field-effect transistor is electrically connected to the gate terminal of the second field-effect transistor.
[0027] The gate terminal of the second field-effect transistor is electrically connected to the first voltage source, the drain terminal of the second field-effect transistor is also electrically connected to the first voltage source, and the source terminal of the second field-effect transistor is electrically connected to the second voltage source.
[0028] Optionally, the protection module includes a voltage regulator unit, which is electrically connected between the voltage output terminal of the power supply module and the first functional unit;
[0029] The voltage regulator unit provides the first voltage to the first functional unit based on the voltage output of the power supply module, and the difference between the first voltage and the target voltage of the first functional unit is less than a second preset value.
[0030] Optionally, the protection module further includes a second protection unit, which is electrically connected between the voltage output terminal of the power supply module and the first functional unit;
[0031] The second protection unit generates an output signal based on the voltage at the voltage output terminal of the power supply module. If the voltage at the voltage output terminal of the power supply module is greater than the maximum voltage that the first functional unit can withstand, the first functional unit controls the power management module to power down based on the output signal.
[0032] Optionally, the second protection unit includes a comparator and a third voltage source;
[0033] The positive input terminal of the comparator is electrically connected to the voltage output terminal of the power supply module, the negative input terminal of the comparator is electrically connected to the third voltage source, and the output terminal of the comparator is electrically connected to the first functional unit.
[0034] The comparator generates the output signal based on the voltage difference between the voltage output terminal of the power supply module and the voltage of the third voltage source;
[0035] The difference between the voltage of the third voltage source and the maximum voltage that the first functional unit can withstand is less than a third preset value.
[0036] An electronic device, comprising:
[0037] The power management module described in any of the above items;
[0038] At least one second functional unit, wherein the power management module supplies power to the at least one second functional unit, and the second functional unit is electrically connected to the voltage output terminal of the power supply module. Attached Figure Description
[0039] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0040] The structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.
[0041] Figure 1 This application provides a schematic diagram of the structure of a power management module.
[0042] Figure 2 This is a schematic diagram of another power management module provided in this application;
[0043] Figure 3 A schematic diagram of another power management module provided in this application;
[0044] Figure 4 This application provides a schematic diagram of the structure of the first functional unit in a power management module;
[0045] Figure 5 A schematic diagram of another power management module provided in this application;
[0046] Figure 6 A schematic diagram of another power management module provided in this application;
[0047] Figure 7 A schematic diagram of another power management module provided in this application;
[0048] Figure 8 This is a schematic diagram of the structure of the second functional unit in a power management module provided in this application. Detailed Implementation
[0049] The embodiments of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0050] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0051] As described in the background section, the PMU has a significant impact on the operation of various components in electronic devices. Therefore, how to protect the PMU and ensure its normal operation has become a key issue for those skilled in the art.
[0052] Based on the above, this application provides a power management module, such as... Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a power management module provided in this application. The power management module includes: a power supply module 100, a protection module 200, and a first functional unit 300.
[0053] The voltage output terminal 102 of the power supply module 100 outputs the power supply voltage. It should be noted that the voltage output terminal 102 of the power supply module 100 can be an integrated circuit PMUD (Power Management Unit for Digital Domain, abbreviated as PMUD) used for managing and regulating the power supply voltage, but this application does not limit it and it depends on the specific situation.
[0054] The protection module 200 is electrically connected between the voltage output terminal 102 of the power supply module 100 and the first functional unit 300. The protection module 200 can provide a first voltage to the first functional unit 300 based on the voltage of the voltage output terminal of the power supply module 100.
[0055] The first voltage is not greater than the maximum voltage that the first functional unit 300 can withstand.
[0056] As can be seen from the above, the protection module 200 can provide a first voltage to the first functional unit 300 based on the voltage of the voltage output terminal 102 of the power supply module 100. The first voltage is not greater than the maximum withstand voltage of the first functional unit 300. In other words, the protection module 200 can maintain the power supply voltage of the first functional unit 300 below its maximum withstand voltage, thereby realizing the overvoltage protection of the first functional unit 300, avoiding overvoltage damage to the first functional unit 300, ensuring the normal operation of the power management module, and thus ensuring the normal operation of the electronic device in which it is located.
[0057] It should be noted that when a short circuit or other fault occurs in the internal circuitry of the power management module, the voltage at its output terminal may be short-circuited to a higher voltage. In other words, the voltage at the output terminal of the power management module will increase due to the fault, which may cause overvoltage damage to the components powered by the output terminal in the power management module. This is especially true for some low-voltage components, such as digital core circuits, which are more prone to overvoltage damage, thus causing the power management module to malfunction.
[0058] For example, the digital core circuit, within the power management module, plays a role in voltage output control through control logic. When it fails, the power management module becomes unstable, unable to provide the correct supply voltage to the powered components, potentially damaging even expensive chips. However, digital core circuits are typically implemented using low-voltage components to reduce their area and power consumption. Therefore, as a crucial component in the power management module, the digital core circuit can only withstand relatively low voltages. Based on this, to ensure the normal operation of the power management module, overvoltage protection for the digital core circuit is necessary. In other words, the first functional unit 300 mentioned above can be a digital core circuit, but this application does not limit this; it depends on the specific circumstances.
[0059] In one embodiment of this application, such as Figure 2 As shown, Figure 2This is a schematic diagram of the structure of a power management module provided in this application. The protection module 200 includes a first protection unit 210, which is electrically connected between the voltage output terminal 102 of the power supply module 100 and the first functional unit 300. The first protection unit 210 provides a first voltage to the first functional unit 300 based on the voltage of the voltage output terminal 102 of the power supply module 100.
[0060] The voltage at the voltage output terminal 102 of the power supply module 100 is within a preset range, and the maximum voltage within the preset range is not greater than the maximum voltage that the first functional unit 300 can withstand. The first protection unit 210 provides a first voltage to the first functional unit 300 based on the first voltage drop and the voltage at the voltage output terminal 102 of the power supply module 100. The first voltage is equal to the difference between the voltage at the voltage output terminal 102 of the power supply module 100 and the first voltage drop.
[0061] Alternatively, if the voltage at the voltage output terminal 102 of the power supply module 100 exceeds a preset range, i.e., the voltage at the voltage output terminal 102 of the power supply module 100 exceeds the maximum voltage that the first functional unit 300 can withstand, the first protection unit 210 provides a first voltage to the first functional unit 300 based on the second voltage drop and the voltage at the voltage output terminal 102 of the power supply module 100. The first voltage is equal to the difference between the voltage at the voltage output terminal 102 of the power supply module 100 and the second voltage drop.
[0062] The second pressure drop is greater than the first pressure drop, and the first pressure drop is less than the first preset value.
[0063] Based on the above, the first protection unit 210 can adjust the first voltage supplied to the first functional unit 300 based on the voltage at the voltage output terminal 102 of the power supply module 100. When the voltage at the voltage output terminal 102 of the power supply module 100 is within a preset range, that is, not greater than the maximum voltage that the first functional unit 300 can withstand, the first voltage supplied to the first functional unit 300 by the first protection unit 210 is equal to the difference between the voltage at the voltage output terminal 102 of the power supply module 100 and the first voltage drop. Knowing that the first voltage drop is less than the first preset value, when the voltage of the voltage output terminal 102 of the power supply module 100 is within the preset range, the first protection unit 210 can apply a slight voltage drop to the voltage of the voltage output terminal 102 of the power supply module 100. This allows the first protection unit 210 to obtain a first voltage based on the difference between the slight voltage drop and the voltage of the voltage output terminal 102 of the power supply module 100 when the voltage of the voltage output terminal 102 of the power supply module 100 is within the preset range. This ensures that the first voltage is not significantly different from the voltage of the voltage output terminal 102 of the power supply module 100 and is not greater than the maximum voltage that the first functional unit 300 can withstand.
[0064] When the voltage at the voltage output terminal 102 of the power supply module 100 is greater than the maximum voltage that the first functional unit 300 can withstand, the first voltage supplied to the first functional unit 300 is equal to the difference between the voltage at the voltage output terminal 102 of the power supply module 100 and the second voltage drop. That is, the first protection unit 210 can reduce the voltage supplied to the first functional unit 300 by the voltage output terminal 102 of the power supply module 100 to a greater extent, so that when the power management module fails and the voltage at the voltage output terminal 102 of its power supply module 100 is too high, the first voltage supplied to the first functional unit 300 will not be greater than the maximum voltage that the first functional unit 300 can withstand, thus avoiding overvoltage damage to the first functional unit 300.
[0065] In one embodiment of this application, such as Figure 3 As shown, Figure 3 This is a schematic diagram of the structure of a power management module provided in this application. The first protection unit 210 includes a first part 212 and a second part 214.
[0066] The first part 212 is electrically connected between the voltage output terminal 102 of the power supply module 100 and the first functional unit 300. The first part 212 receives the voltage from the voltage output terminal 102 of the power supply module 100 and outputs the first voltage.
[0067] The second part 214 is electrically connected to the first part 212. The second part 214 controls the first part 212 to output a first voltage based on the first voltage drop and the voltage output terminal 102 of the power supply module 100. Alternatively, the second part 214 controls the first part 212 to output a first voltage based on the second voltage drop and the voltage output terminal 102 of the power supply module 100.
[0068] As can be seen from the above, the first protection unit 210 may include a first part 212 that receives the voltage of the voltage output terminal of the power supply module 100, and a second part 214 that controls the first part 212 to output a first voltage based on the voltage of the voltage output terminal 102 of the power supply module 100, so that no matter whether the voltage of the voltage output terminal 102 of the power supply module 100 is too high, the first voltage supplied to the first functional unit 300 will not exceed the maximum voltage it can withstand, thereby realizing the overvoltage protection of the first functional unit 300.
[0069] In one embodiment of this application, such as Figure 4 As shown, Figure 4 The present application provides a schematic diagram of the structure of the first protection unit 210 in a power management module. The first part 212 includes a first field-effect transistor MC1, and the second part 214 includes a clamping circuit 216.
[0070] The first terminal of the first field-effect transistor MC1 is electrically connected to the voltage output terminal 102 of the power supply module 100, and receives the voltage from the voltage output terminal 102 of the power supply module 100. The second terminal of the first field-effect transistor MC1 is electrically connected to the first functional unit 300, and provides a first voltage to the first functional unit 300.
[0071] The clamping circuit 216 is electrically connected to the gate terminal of the first field-effect transistor MC1, and controls the gate voltage of the first field-effect transistor MC1 to be the second voltage.
[0072] Based on the second voltage, if the voltage of the voltage output terminal 102 of the power supply module 100 is within a preset range, the first voltage output by the second terminal of the first field-effect transistor MC1 is equal to the difference between the voltage of the voltage output terminal 102 of the power supply module 100 and the first voltage drop. That is, when the voltage of the voltage output terminal 102 of the power supply module 100 is within a preset range, the first voltage provided by the second terminal of the first field-effect transistor MC1 to the first functional unit 300 is equal to the difference between the voltage of the voltage output terminal 102 of the power supply module 100 and the first voltage drop.
[0073] Alternatively, based on the second voltage, if the voltage at the voltage output terminal 102 of the power supply module 100 exceeds a preset range, i.e., is greater than the maximum voltage that the first functional unit 300 can withstand, the first voltage output from the second terminal of the first field-effect transistor MC1 is equal to the difference between the voltage at the voltage output terminal 102 of the power supply module 100 and the second voltage drop, so that the first voltage supplied to the first functional unit 300 is not greater than the maximum voltage that the first functional unit 300 can withstand.
[0074] When the gate voltage of the first field-effect transistor MC1 is the second voltage, and the voltage of the voltage output terminal 102 of the power supply module 100 is within a preset range, that is, when the gate voltage of the first field-effect transistor MC1 is the second voltage and the voltage of the first terminal of the first field-effect transistor MC1 is not too large, the first field-effect transistor MC1 can work in the linear region. The first voltage drop is the voltage drop between the first terminal and the second terminal of the first field-effect transistor MC1 when the first field-effect transistor MC1 is working in the linear region. Since the source and drain voltages of the field-effect transistor are approximately the same when the field-effect transistor is operating in the linear region, the voltage drop between the first and second terminals of the first field-effect transistor MC1 is very small when the voltage of the voltage output terminal 102 of the power supply module 100 is within a preset range. That is, the first voltage drop is very small, so that when the voltage of the voltage output terminal 102 of the power supply module 100 is within the preset range, the first protection unit 210 can obtain the first voltage based on the difference between the small first voltage drop and the voltage of the voltage output terminal 102 of the power supply module 100. Thus, the first voltage is the voltage after a small voltage drop on the voltage of the voltage output terminal 102 of the power supply module 100, which is not greater than the maximum voltage that the first functional unit 300 can withstand.
[0075] When the gate electrode of the first field-effect transistor MC1 is at the second voltage, and the voltage at the voltage output terminal 102 of the power supply module 100 exceeds the preset range (i.e., the gate voltage of the first field-effect transistor MC1 is the second voltage, and the voltage at the first terminal of the first field-effect transistor MC1 is too high), the first field-effect transistor MC1 can operate in the saturation region. When the first field-effect transistor MC1 operates in the saturation region, the current between the first and second terminals of the first field-effect transistor MC1 is controlled only by the gate voltage, i.e., only by the second voltage. Let the voltage difference between the gate and second terminals of the first field-effect transistor MC1 be denoted as the first voltage difference. Then, the voltage at the second terminal of the first field-effect transistor MC1 is equal to the difference between the second voltage and the first voltage difference. In other words, when the gate electrode of the first field-effect transistor MC1 is at the second voltage and the voltage of the voltage output terminal 102 of the power supply module 100 exceeds the preset range, the voltage of the second terminal of the first field-effect transistor MC1 can be equal to the difference between the voltage of the voltage output terminal 102 of the power supply module 100 and the second voltage drop based on the second voltage. This allows for a greater voltage drop on the voltage output terminal 102 of the power supply module 100, ensuring that the first voltage supplied to the first functional unit 300 is not greater than the maximum voltage that the first functional unit 300 can withstand.
[0076] As can be seen from the above, the first part 212 may include the first field-effect transistor MC1, and the second part 214 may include the clamping circuit 216. The clamping circuit 216 can control the voltage at the gate terminal of the first field-effect transistor MC1 to be the second voltage, so as to control the voltage drop between the first terminal and the second terminal of the first field-effect transistor MC1, thereby controlling the output voltage at the second terminal of the first field-effect transistor MC1 to be no greater than the maximum voltage that the first functional unit 300 can withstand. This can prevent the first voltage supplied to the first functional unit 300 from being greater than the maximum voltage that the first functional unit 300 can withstand, thus realizing the overvoltage protection of the first functional unit 300.
[0077] In one embodiment of this application, such as Figure 4 As shown, the clamping circuit 216 includes a second field-effect transistor MC2, a first voltage source U1, and a second voltage source U2.
[0078] The gate terminal of the second field-effect transistor MC2 is electrically connected to the gate terminal of the first field-effect transistor MC1, and is also electrically connected to the first voltage source U1. The first terminal of the second field-effect transistor MC2 is also electrically connected to the first voltage source U1, and the second terminal of the second field-effect transistor MC2 is electrically connected to the second voltage source U2. Based on this, the voltage at the gate terminal of the first field-effect transistor MC1 can be the sum of the voltage of the second voltage source U2 and the second voltage difference of the second field-effect transistor MC2. The second voltage difference of the second field-effect transistor MC2 is the voltage difference between the gate terminal and the second terminal of the second field-effect transistor MC2.
[0079] Wherein, the voltage of the second voltage source U2 is not greater than the maximum voltage that the first functional unit 300 can withstand, and the voltage of the second voltage source U2 is greater than the maximum voltage in the preset range.
[0080] For ease of description, the voltage of the second voltage source U2 is denoted as VOVP, the voltage difference between the gate and the second terminal of the first field-effect transistor MC1 is denoted as the first voltage difference VGS1, and the voltage difference between the gate and the second terminal of the second field-effect transistor MC2 is denoted as the second voltage difference VGS2. During the operation of the first protection unit 210, the voltage at the gate of the second field-effect transistor MC2 (i.e., the second voltage) is VOVP + VGS2.
[0081] When the voltage at the voltage output terminal 102 of the power supply module 100 is within a preset range and does not exceed the maximum voltage that the first functional unit 300 can withstand, the first field-effect transistor MC1 operates in the linear region. The impedance of the first field-effect transistor MC1 is small, so the voltage at the first terminal and the second terminal of the first field-effect transistor MC1 is approximately the same, the first voltage drop is very small, and the voltage at the second terminal of the first field-effect transistor MC1 can be approximately equal to the voltage at the first terminal, without exceeding the maximum voltage that the first functional unit 300 can withstand.
[0082] When the voltage at the voltage output terminal 102 of the power supply module 100 exceeds the maximum voltage that the first functional unit 300 can withstand, the first field-effect transistor MC1 operates in the saturation region. At this time, the voltage at the second terminal of the first field-effect transistor MC1 is VOVP + VGS2 - VGS1, so the voltage at the second terminal of the first field-effect transistor MC1 can be approximately equal to VOVP, that is, approximately equal to the voltage of the second voltage source U2. It is known that the voltage of the second voltage source U2 is not greater than the maximum voltage that the first functional unit 300 can withstand, and the voltage of the second voltage source U2 is greater than the maximum voltage in the preset range. Therefore, when the voltage at the voltage output terminal 102 of the power supply module 100 exceeds the maximum voltage that the first functional unit 300 can withstand, a significant voltage drop can be achieved at the voltage output terminal 102 of the power supply module 100. This ensures that the first voltage supplied to the first functional unit 300 is not greater than the maximum voltage that the first functional unit 300 can withstand, thus achieving overvoltage protection for the first functional unit 300. It should be noted that the first voltage source U1 mentioned above can be a 5V voltage source, but this application does not limit it and it depends on the specific circumstances.
[0083] It should also be noted that since the gate terminals of the first field-effect transistor MC1 and the second field-effect transistor MC2 are electrically connected, and since the first field-effect transistor MC1 and the second field-effect transistor MC2 can be field-effect transistors with the same parameters, the first voltage difference VGS1 of the first field-effect transistor MC1 and the second voltage difference VGS2 of the second field-effect transistor MC2 can be approximately equal. Therefore, when the voltage at the second terminal of the first field-effect transistor MC1 is VOVP + VGS2 - VGS1, the voltage at the second terminal of the first field-effect transistor MC1 can be approximately equal to VOVP.
[0084] Based on the above, in one embodiment of this application, the first field-effect transistor MC1 is an N-type field-effect transistor, and the second field-effect transistor MC2 is an N-type field-effect transistor.
[0085] The drain terminal of the first field-effect transistor MC1 is electrically connected to the voltage output terminal 102 of the power supply module 100, the source terminal of the first field-effect transistor MC1 is electrically connected to the first functional unit 300, and the gate terminal of the first field-effect transistor MC1 is electrically connected to the gate terminal of the second field-effect transistor MC2.
[0086] The gate of the second field-effect transistor MC2 is electrically connected to the first voltage source U1, the drain of the second field-effect transistor MC2 is also electrically connected to the first voltage source U1, and the source of the second field-effect transistor MC2 is electrically connected to the second voltage source U2.
[0087] In one embodiment of this application, such as Figure 5 As shown, Figure 5 The present application provides a schematic diagram of the structure of a power management module. The protection module 200 may include a voltage regulator unit 230, which is electrically connected between the voltage output terminal 102 of the power supply module 100 and the first functional unit 300.
[0088] The voltage regulator unit 230 can provide a first voltage to the first functional unit 300 based on the voltage of the voltage output terminal 102 of the power supply module 100. The difference between the first voltage and the target voltage of the first functional unit 300 is less than a second preset value.
[0089] It should be noted that the target voltage of the first functional unit 300 is the desired voltage of the first functional unit 300, that is, the voltage supplied by the voltage output terminal 102 of the power supply module 100 to the first functional unit 300 when the voltage of the power supply module 100 does not increase due to a fault in the power management module. The voltage regulator unit 230 can provide a first voltage to the first functional unit 300 based on the voltage of the voltage output terminal 102 of the power supply module 100, and the difference between the first voltage and the target voltage of the first functional unit 300 is less than a second preset value. In other words, the voltage regulator unit 230 can maintain the first voltage supplied to the first functional unit 300 within the desired range and will not increase due to a fault in the power management module, thus achieving overvoltage protection for the first functional unit 300.
[0090] Based on the above, in one embodiment of this application, the voltage regulating unit 230 can be a low-dropout regulator (LDO). However, this application does not limit this and the specific choice depends on the circumstances.
[0091] In one embodiment of this application, such as Figure 6 and Figure 7 As shown, Figure 6 and Figure 7 These are all schematic diagrams of a power management module provided in this application. The protection module 200 also includes a second protection unit 220, which is electrically connected between the voltage output terminal 102 of the power supply module 100 and the first functional unit 300.
[0092] The second protection unit 220 generates an output signal based on the voltage of the voltage output terminal 102 of the power supply module 100. If the voltage of the voltage output terminal 102 of the power supply module 100 is greater than the maximum voltage that the first functional unit 300 can withstand, the first functional unit 300 controls the power management module to power down based on the output signal.
[0093] It should be noted that when the voltage at the voltage output terminal 102 of the power supply module 100 exceeds the maximum voltage that the first functional unit 300 can withstand, it indicates that the power management module may have malfunctioned and can no longer provide the correct power supply voltage to the components it supplies. Therefore, the protection module 200 of the power management module described in this application also includes a second protection unit 220. This second protection unit 220 can provide an output signal to the first functional unit 300 when the voltage at the voltage output terminal 102 of the power supply module 100 exceeds the maximum voltage that the first functional unit 300 can withstand. This allows the first functional unit 300 to control the power management module to power down based on the output signal, ensuring that other powered components besides the first functional unit 300 are not damaged.
[0094] In one embodiment of this application, such as Figure 8 As shown, Figure 8 This application provides a schematic diagram of the structure of a second protection unit 220 in a power management module. The second protection unit 220 includes a comparator 222 and a third voltage source U3.
[0095] The positive input terminal of comparator 222 is electrically connected to the voltage output terminal 102 of power supply module 100, the negative input terminal of comparator 222 is electrically connected to the third voltage source U3, and the output terminal of comparator 222 is electrically connected to the first functional unit 300.
[0096] Comparator 222 can generate an output signal based on the voltage difference between the voltage at the voltage output terminal 102 of the power supply module 100 and the voltage at the third voltage source U3.
[0097] The difference between the voltage of the third voltage source U3 and the maximum voltage that the first functional unit 300 can withstand is less than a third preset value. Specifically, the voltage of the third voltage source U3 can be greater than the maximum voltage that the first functional unit 300 can withstand, and the difference between the voltage of the third voltage source U3 and the maximum voltage that the first functional unit 300 can withstand is less than the third preset value.
[0098] Based on the above, when the voltage at the voltage output terminal 102 of the power supply module 100 is within a preset range and does not exceed the maximum voltage that the first functional unit 300 can withstand, the voltage at the positive input terminal of the comparator 222 is less than the voltage at the negative input terminal, and the output terminal of the comparator 222 generates a negative output signal. The first functional unit 300 does not power down the power management module. However, when the voltage at the voltage output terminal 102 of the power supply module 100 exceeds the maximum voltage that the first functional unit 300 can withstand, the voltage at the positive input terminal of the comparator 222 is greater than the voltage at the negative input terminal, and the output terminal of the comparator 222 generates a positive output signal. The first functional unit 300 can then power down the power management module based on this positive output signal, controlling the power management module to power down to avoid damage to the internal components of the power management module and other powered components.
[0099] Accordingly, this application also provides an electronic device, such as Figure 1 As shown, the electronic device includes a power management module 001 as described in any of the above embodiments, and at least one second functional unit 400. The power management module is used to supply power to the at least one second functional unit 400, and the second functional unit 400 can be electrically connected to the voltage output terminal 102 of the power supply module 100.
[0100] The various embodiments in this specification are described in a progressive, parallel, or combined manner. Each embodiment focuses on its differences from other embodiments, and similar or identical parts between embodiments can be referred to interchangeably. For the apparatuses disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.
[0101] It should be noted that, in the description of this application, the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.
[0102] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.
[0103] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A power management module, characterized in that, include: The power supply module outputs a power supply voltage at its voltage output terminal. Protection module; First functional unit; The protection module is electrically connected between the voltage output terminal of the power supply module and the first functional unit. The protection module provides a first voltage to the first functional unit based on the voltage of the voltage output terminal of the power supply module. Wherein, the first voltage is not greater than the maximum voltage that the first functional unit can withstand.
2. The power management module according to claim 1, characterized in that, The protection module includes a first protection unit, which is electrically connected between the voltage output terminal of the power supply module and the first functional unit. The first protection unit provides the first voltage to the first functional unit based on the voltage of the voltage output terminal of the power supply module. Wherein, the voltage at the voltage output terminal of the power supply module is within a preset range, and the maximum voltage within the preset range is not greater than the maximum voltage that the first functional unit can withstand. The first protection unit provides the first voltage to the first functional unit based on the first voltage drop and the voltage at the voltage output terminal of the power supply module. The first voltage is equal to the difference between the voltage at the voltage output terminal of the power supply module and the first voltage drop; or If the voltage at the voltage output terminal of the power supply module exceeds the preset range, the first protection unit provides the first voltage to the first functional unit based on the second voltage drop and the voltage at the voltage output terminal of the power supply module. The first voltage is equal to the difference between the voltage at the voltage output terminal of the power supply module and the second voltage drop. Wherein, the second voltage drop is greater than the first voltage drop, and the first voltage drop is less than the first preset value.
3. The power management module according to claim 2, characterized in that, The first protection unit includes a first part and a second part; The first part is electrically connected between the voltage output terminal of the power supply module and the first functional unit. The first part receives the voltage from the voltage output terminal of the power supply module and outputs the first voltage. The second part is electrically connected to the first part, and the second part controls the first part to output the first voltage based on the first voltage drop and the voltage of the voltage output terminal of the power supply module, or the second part controls the first part to output the first voltage based on the second voltage drop and the voltage of the voltage output terminal of the power supply module.
4. The power management module according to claim 3, characterized in that, The first part includes a first field-effect transistor, and the second part includes a clamping circuit; The first terminal of the first field-effect transistor is electrically connected to the voltage output terminal of the power supply module, and the voltage of the voltage output terminal of the power supply module is input; the second terminal of the first field-effect transistor is electrically connected to the first functional unit, and the first voltage is provided to the first functional unit. The clamping circuit is electrically connected to the gate terminal of the first field-effect transistor and controls the gate voltage of the first field-effect transistor to be the second voltage. Wherein, based on the second voltage, the voltage at the voltage output terminal of the power supply module is within the preset range, and the first voltage output from the second terminal of the first field-effect transistor is equal to the difference between the voltage at the voltage output terminal of the power supply module and the first voltage drop; or, Based on the second voltage, the voltage at the voltage output terminal of the power supply module exceeds the preset range, and the first voltage output from the second terminal of the first field-effect transistor is equal to the difference between the voltage at the voltage output terminal of the power supply module and the second voltage drop.
5. The power management module according to claim 4, characterized in that, The clamping circuit includes a second field-effect transistor, a first voltage source, and a second voltage source. The gate terminal of the second field-effect transistor is electrically connected to the gate terminal of the first field-effect transistor and is also electrically connected to the first voltage source. The first terminal of the second field-effect transistor is also electrically connected to the first voltage source, and the second terminal of the second field-effect transistor is electrically connected to the second voltage source. Wherein, the voltage of the second voltage source is not greater than the maximum voltage that the first functional unit can withstand, and the voltage of the second voltage source is greater than the maximum voltage in the preset range.
6. The power management module according to claim 5, characterized in that, The first field-effect transistor is an N-type field-effect transistor, and the second field-effect transistor is an N-type field-effect transistor; The drain terminal of the first field-effect transistor is electrically connected to the voltage output terminal of the power supply module, the source terminal of the first field-effect transistor is electrically connected to the first functional unit, and the gate terminal of the first field-effect transistor is electrically connected to the gate terminal of the second field-effect transistor. The gate terminal of the second field-effect transistor is electrically connected to the first voltage source, the drain terminal of the second field-effect transistor is also electrically connected to the first voltage source, and the source terminal of the second field-effect transistor is electrically connected to the second voltage source.
7. The power management module according to claim 1, characterized in that, The protection module includes a voltage regulator unit, which is electrically connected between the voltage output terminal of the power supply module and the first functional unit. The voltage regulator unit provides the first voltage to the first functional unit based on the voltage output of the power supply module, and the difference between the first voltage and the target voltage of the first functional unit is less than a second preset value.
8. The power management module according to claim 2 or 7, characterized in that, The protection module further includes a second protection unit, which is electrically connected between the voltage output terminal of the power supply module and the first functional unit. The second protection unit generates an output signal based on the voltage at the voltage output terminal of the power supply module. If the voltage at the voltage output terminal of the power supply module is greater than the maximum voltage that the first functional unit can withstand, the first functional unit controls the power management module to power down based on the output signal.
9. The power management module according to claim 8, characterized in that, The second protection unit includes a comparator and a third voltage source; The positive input terminal of the comparator is electrically connected to the voltage output terminal of the power supply module, the negative input terminal of the comparator is electrically connected to the third voltage source, and the output terminal of the comparator is electrically connected to the first functional unit. The comparator generates the output signal based on the voltage difference between the voltage output terminal of the power supply module and the voltage of the third voltage source; The difference between the voltage of the third voltage source and the maximum voltage that the first functional unit can withstand is less than a third preset value.
10. An electronic device, characterized in that, include: The power management module according to any one of claims 1-9; At least one second functional unit, wherein the power management module supplies power to the at least one second functional unit, and the second functional unit is electrically connected to the voltage output terminal of the power supply module.