Current control circuit, power supply chip, power supply system and vehicle
By designing a current control circuit, the current flowing through the load is monitored and adjusted in real time, the problem that the power supply chip cannot effectively control the current is solved, and the load is protected and damage and safety hazards are avoided.
Patent Information
- Application Number
- CN202510566435.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2025-08-12
AI Technical Summary
Existing power chips cannot effectively control the current flowing through the load, resulting in load damage and safety hazards.
A current control circuit is designed, including a current control module, a current sampling module and a comparison module. By monitoring and adjusting the current flowing through the load in real time, a voltage signal is generated by a first resistor module to limit the current.
It effectively avoids load damage and safety hazards caused by abnormal currents, and achieves protection of loads.
Smart Images
Figure CN120473961A_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of electronic circuit technology, and in particular relates to a current control circuit, a power chip, a power system and a vehicle. Background Art
[0002] Power supply chips play a vital role in today's electronic devices, converting and managing electrical energy to ensure stable operation. However, a current problem is that power supply chips cannot effectively control the current flowing through the load. When the current flowing through the load is too high, this often causes damage to the load and may even lead to more serious safety issues. Summary of the Invention
[0003] The embodiments of the present application provide a current control circuit, a power chip, a power system and a vehicle, which can solve the problem that the current power chip cannot effectively control the current flowing through the load.
[0004] In a first aspect, an embodiment of the present application provides a current control circuit, comprising a current control module, a current sampling module, and a comparison module, wherein the current control module is electrically connected to the current sampling module, the comparison module, a power supply module, and a load, respectively; and the comparison module is electrically connected to the current sampling module and a first resistance module, respectively. The first resistance module is an external resistance module of the current control circuit;
[0005] The current sampling module is used to sample the target current and output a first current based on the target current, wherein the target current is the current output by the current control module; the comparison module is used to output a comparison signal to the current control module based on a first voltage and a preset reference voltage, wherein the first voltage is the voltage generated by the first resistance module based on the first current; and the current control module is used to adjust the target current based on the comparison signal.
[0006] In a possible implementation of the first aspect, the current control circuit further includes a charge pump module, and the charge pump module is electrically connected to the comparison module, the current control module, the current sampling module, and the load respectively;
[0007] The current control module is used to output a second voltage to the charge pump module; the charge pump module is used to convert the second voltage into a third voltage to supply power to the comparison module.
[0008] In a possible implementation of the first aspect, the current control module includes a first field-effect transistor, a gate of the first field-effect transistor being electrically connected to the current sampling module and the comparison module, respectively, a drain of the first field-effect transistor being electrically connected to the power supply module, and a source of the first field-effect transistor being electrically connected to a substrate of the first field-effect transistor, the current sampling module, the charge pump module, and the load, respectively.
[0009] In a possible implementation of the first aspect, the current sampling module includes a second field-effect transistor, a third field-effect transistor, and a first operational amplifier. The gate of the second field-effect transistor is electrically connected to the gate of the first field-effect transistor, the drain of the second field-effect transistor is used to be electrically connected to the power supply module, the source of the second field-effect transistor is respectively electrically connected to the first input terminal of the first operational amplifier and the source of the third field-effect transistor, the substrate of the second field-effect transistor is respectively electrically connected to the substrate of the first field-effect transistor and the second input terminal of the first operational amplifier, the output terminal of the first operational amplifier is electrically connected to the gate of the third field-effect transistor, the power terminal of the first operational amplifier is used to receive a power supply voltage, the ground terminal of the first operational amplifier is grounded, the substrate of the third field-effect transistor is used to receive the power supply voltage, and the drain of the third field-effect transistor is respectively electrically connected to the comparison module and the first resistance module.
[0010] In a possible implementation of the first aspect, the comparison module includes a second operational amplifier, a first input terminal of the second operational amplifier is electrically connected to the current sampling module and the first resistance module, respectively, a second input terminal of the second operational amplifier is used to receive a preset reference voltage, an output terminal of the second operational amplifier is electrically connected to the current control module and the current sampling module, respectively, a power supply terminal of the second operational amplifier is electrically connected to the charge pump module, and a ground terminal of the second operational amplifier is grounded.
[0011] In a possible implementation of the first aspect, the current control circuit further includes a backflow prevention module and a second resistance module, the anti-backflow module being electrically connected to the current control module, the load, the charge pump module, the comparison module, the second resistance module, and the current sampling module, respectively; and the second resistance module being electrically connected to the current control module, the current sampling module, and the comparison module, respectively.
[0012] The anti-backflow module is used to prevent the target current from flowing from the load to the power module; the second resistance module is used to isolate the third voltage and the comparison signal.
[0013] In a possible implementation of the first aspect, the anti-backflow module includes a fourth field-effect transistor, the gate of the fourth field-effect transistor is electrically connected to the charge pump module, the comparison module and the second resistance module, respectively, the source of the fourth field-effect transistor and the substrate of the fourth field-effect transistor are electrically connected to the current control module, the current sampling module and the charge pump module, and the drain of the fourth field-effect transistor is used to be electrically connected to the load.
[0014] In the second aspect, an embodiment of the present application provides a power supply chip, comprising the current control circuit described in any one of the first aspects, wherein a pin is led out at the connection between the comparison module and the current sampling module in the current control circuit as an external resistor pin of the power supply chip, and the external resistor pin of the power supply chip is used to be electrically connected to the first resistor module.
[0015] In a third aspect, an embodiment of the present application provides a power supply system, comprising a first resistor module and the power supply chip described in any one of the second aspects, wherein the first resistor module is electrically connected to an external resistor pin in the power supply chip.
[0016] In a fourth aspect, an embodiment of the present application provides a vehicle comprising the power supply system described in any one of the third aspects.
[0017] Compared with the prior art, the embodiments of the present application have the following beneficial effects:
[0018] An embodiment of the present application provides a current control circuit, including a current control module, a current sampling module and a comparison module. The current control module is electrically connected to the current sampling module, the comparison module, the power supply module and the load, respectively. The comparison module is electrically connected to the current sampling module and the first resistance module, respectively. The first resistance module is an external resistance module of the current control circuit.
[0019] When the power module supplies power, the current control module begins operating and allows current to flow to the load. The current sampling module samples the current output by the current control module, i.e., the current flowing through the load, to obtain a first current. The first resistor module generates a first voltage based on the first current. The comparison module receives the first voltage and outputs a comparison signal to the current control module based on the first voltage and a preset reference voltage. The current control module regulates the current flowing through the load based on the comparison signal. If the current flowing through the load is too high, the current flowing through the load is limited to protect the load.
[0020] In summary, the current control circuit provided in the present application effectively avoids load damage and safety hazards caused by abnormal current by real-time monitoring and adjusting the current flowing through the load.
[0021] It can be understood that the beneficial effects of the second to fourth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0023] Figure 1 This is a principle block diagram of a current control circuit provided in one embodiment of the present application;
[0024] Figure 2 is a principle block diagram of a current control circuit provided by another embodiment of the present application;
[0025] Figure 3 1 is a circuit connection diagram of a current control circuit provided in one embodiment of the present application;
[0026] Figure 4 is a circuit connection diagram of a current control circuit provided in another embodiment of the present application;
[0027] Figure 5 is a principle block diagram of a current control circuit provided by another embodiment of the present application;
[0028] Figure 6 is a circuit connection diagram of a current control circuit provided in another embodiment of the present application;
[0029] Figure 7 This is a principle block diagram of a power supply system provided in one embodiment of the present application.
[0030] In the figure: 10, current control circuit; 11, current control module; 12, current sampling module; 13, comparison module; 14, charge pump module; 15, anti-backflow module; 16, second resistor module; 20, power module; 30, load; 40, first resistor module; 50, power chip; 60, power system. DETAILED DESCRIPTION
[0031] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.
[0032] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.
[0033] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
[0034] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.
[0035] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.
[0036] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.
[0037] As the core power supply unit of electronic devices, power chips perform critical functions such as power conversion, distribution, and voltage regulation. However, current power chips cannot effectively control the current flowing through the load. When the system experiences a sudden overload or short circuit, the transient high current cannot be suppressed in time, potentially causing load damage, chip overheating and failure, and even fire risks due to thermal runaway.
[0038] To address the problem that current power supply chips cannot effectively control the current flowing through the load, the present application provides a current control circuit, such as Figure 1As shown, the current control circuit 10 includes a current control module 11, a current sampling module 12 and a comparison module 13. The power supply end of the current control module 11 is used to be electrically connected to the power supply module 20. The current control end of the current control module 11 is electrically connected to the first input end of the current sampling module 12 and the output end of the comparison module 13. The load end of the current control module 11 is used to be electrically connected to the load 30. The input end of the comparison module 13 is electrically connected to the output end of the current sampling module 12 and the first resistance module 40, respectively. The first resistance module 40 is an external resistance module of the current control circuit 10.
[0039] The current sampling module 12 is configured to sample a target current and output a first current based on the target current, where the target current is the current output by the current control module 11. The comparison module 13 is configured to output a comparison signal to the current control module 11 based on the first voltage and a preset reference voltage, where the first voltage is the voltage generated by the first resistance module 40 based on the first current. The current control module 11 is configured to adjust the target current based on the comparison signal.
[0040] Specifically, when the power module 20 supplies power, the current control module 11 starts working and allows current to flow to the load 30. The current sampling module 12 samples the current output by the current control module 11, that is, the current flowing through the load 30, and obtains a first current after sampling. The first resistance module 40 generates a first voltage based on the first current. The comparison module 13 receives the first voltage and outputs a comparison signal to the current control module 11 based on the first voltage and a preset reference voltage. The current control module 11 adjusts the current flowing through the load 30 based on the comparison signal. If the current flowing through the load 30 is too large, the current flowing through the load 30 will be limited to protect the load 30. For example, the normal range of the current flowing through the load 30 is 0 to 2A. When the current flowing through the load 30 exceeds 2A, it is considered that the current flowing through the load 30 is too large, and the current flowing through the load 30 will be limited to protect the load 30.
[0041] In summary, the current control circuit 10 provided in the present application effectively avoids damage to the load 30 and safety hazards caused by abnormal current by monitoring and adjusting the current flowing through the load 30 in real time.
[0042] It should be noted that the first resistor module 40 is used to adjust the current limit value, which is the maximum current value flowing through the load 30. In actual applications, the resistance value of the first resistor module 40 can be adjusted according to actual conditions, thereby adjusting the current limit value to suit different electrical devices. The power module 20 is used to provide a supply voltage. Its operating principle can be found in the description of relevant existing technologies and will not be repeated here.
[0043] Exemplarily, the load 30 includes electrical devices such as mobile phones, tablets, and laptops.
[0044] In some embodiments, when the target current is relatively low (i.e., less than the current limit), the first current sampled by the current sampling module 12 is also relatively low. Consequently, the first voltage generated by the first resistor module 40 based on the first current is also relatively low. When the first voltage is relatively low, the comparison signal output by the comparison module 13 is a high-level signal. Consequently, the current control module 11 does not limit the target current, allowing the target current to flow fully through the load 30.
[0045] When the target current is relatively large (i.e., greater than or equal to the current limit value), the first current sampled by the current sampling module 12 is also relatively large. Consequently, the first voltage generated by the first resistor module 40 based on the first current is also relatively large. When the first voltage is relatively large, the comparison signal output by the comparison module 13 is lower than the high-level signal. The current control module 11 then limits the target current to within the current limit value, thereby protecting the load 30 from the impact of high current.
[0046] In some embodiments, as Figure 2 As shown, the current control circuit 10 also includes a charge pump module 14, the input end of the charge pump module 14 is electrically connected to the load end of the current control module 11, the second input end of the current sampling module 12 and the load 30 respectively, and the output end of the charge pump module 14 is electrically connected to the power supply end of the comparison module 13.
[0047] Specifically, the current control module 11 is configured to output the second voltage to the charge pump module 14. The charge pump module 14 is configured to convert the second voltage into a third voltage to power the comparison module 13. It should be noted that the charge pump module 14 primarily raises the second voltage to power the comparison module 13. The operating principle of the charge pump module 14 can be found in the description of the relevant prior art and will not be further elaborated here.
[0048] For example, Figure 3 As shown, the current control module 11 includes a first field effect transistor M1, the gate of the first field effect transistor M1 is electrically connected to the first input terminal of the current sampling module 12 and the output terminal of the comparison module 13, the drain of the first field effect transistor M1 is used to be electrically connected to the power supply module 20, and the source of the first field effect transistor M1 is electrically connected to the substrate of the first field effect transistor M1, the second input terminal of the current sampling module 12, the input terminal of the charge pump module 14 and the load 30.
[0049] Specifically, when the target current is relatively low, that is, the target current is less than the current limit value, the first current obtained after sampling by the current sampling module 12 is also relatively low. Therefore, the first voltage generated by the first resistor module 40 based on the first current is also relatively low. When the first voltage is relatively low, the comparison signal output by the comparison module 13 is a high-level signal. Since the comparison signal output by the comparison module 13 is a high-level signal, the first field-effect transistor M1 is fully turned on, thereby not limiting the target current and allowing the target current to flow completely through the load 30.
[0050] When the target current is large, that is, the target current is greater than or equal to the current limit value, the first current obtained after sampling by the current sampling module 12 is also large. Therefore, the first voltage generated by the first resistance module 40 based on the first current is also large. When the first voltage is large, the comparison signal output by the comparison module 13 becomes a signal lower than the high-level signal. Since the comparison signal output by the comparison module 13 becomes a signal lower than the high-level signal, the voltage at the gate of the first field-effect transistor M1 will decrease, and the first field-effect transistor M1 will not be fully turned on, thereby limiting the target current to within the current limit value, thereby protecting the load 30 from the impact of large current.
[0051] As can be seen from the above, the present application monitors the current flowing through the load 30 in real time through the comparison module 13, and outputs a corresponding comparison signal to the current control module 11 based on the current flowing through the load 30. The current control module 11 controls its conduction level based on the corresponding comparison signal to regulate the current flowing through the load 30. If the current flowing through the load 30 is too large, the current flowing through the load 30 will be limited to protect the load 30.
[0052] It should be noted that when the first field effect transistor M1 is turned off, the charge pump module 14 stops working.
[0053] For example, Figure 3 As shown, the current sampling module 12 includes a second field-effect transistor M2, a third field-effect transistor M3 and a first operational amplifier AMP1. The gate of the second field-effect transistor M2 is electrically connected to the gate of the first field-effect transistor M1, the drain of the second field-effect transistor M2 is used to be electrically connected to the power module 20, the source of the second field-effect transistor M2 is electrically connected to the first input terminal of the first operational amplifier AMP1 and the source of the third field-effect transistor M3, respectively, the substrate of the second field-effect transistor M2 is electrically connected to the substrate of the first field-effect transistor M1 and the second input terminal of the first operational amplifier AMP1, respectively, the output terminal of the first operational amplifier AMP1 is electrically connected to the gate of the third field-effect transistor M3, the power terminal of the first operational amplifier AMP1 is used to receive a power supply voltage, the ground terminal of the first operational amplifier AMP1 is grounded, the substrate of the third field-effect transistor M3 is used to receive a power supply voltage, and the drain of the third field-effect transistor M3 is electrically connected to the input terminal of the comparison module 13 and the first resistor module 40, respectively.
[0054] Specifically, the second field-effect transistor M2 and the first field-effect transistor M1 form a current mirror, and the second field-effect transistor M2 samples the current flowing through the load 30 according to a certain ratio. In order to achieve sampling of the current flowing through the load 30 according to a certain ratio, it is necessary to ensure that the voltage at the source of the first field-effect transistor M1 is equal to the voltage at the source of the second field-effect transistor M2. To ensure that the voltage at the source of the first field-effect transistor M1 is equal to the voltage at the source of the second field-effect transistor M2, the present application uses a first operational amplifier AMP1 and a third field-effect transistor M3 to form a negative feedback loop, so that the voltage at the source of the first field-effect transistor M1 is equal to the voltage at the source of the second field-effect transistor M2. In actual applications, the sampling ratio can be adjusted according to actual conditions.
[0055] For example, Figure 3 As shown, the comparison module 13 includes a second operational amplifier AMP2, a first input terminal of the second operational amplifier AMP2 is electrically connected to the output terminal of the current sampling module 12 and the first resistor module 40 respectively, a second input terminal of the second operational amplifier AMP2 is used to receive a preset reference voltage VREF, an output terminal of the second operational amplifier AMP2 is electrically connected to the current control terminal of the current control module 11 and the first input terminal of the current sampling module 12 respectively, a power supply terminal of the second operational amplifier AMP2 is electrically connected to the output terminal of the charge pump module 14, and a ground terminal of the second operational amplifier AMP2 is grounded. Figure 3 It can be seen that the first input terminal of the second operational amplifier AMP2 is electrically connected to the drain of the third field effect transistor M3, and the output terminal of the second operational amplifier AMP2 is electrically connected to the gate of the first field effect transistor M1 and the gate of the second field effect transistor M2 respectively.
[0056] Specifically, the comparison module 13 uses the second operational amplifier AMP2 to monitor the current flowing through the load 30. When the target current is small, that is, the target current is less than the current limit value, the first current obtained after sampling by the current sampling module 12 is also small. Therefore, the first voltage generated by the first resistance module 40 according to the first current is also small. When the first voltage is small, the comparison signal output by the second operational amplifier AMP2 is a high-level signal, and the voltage of the high-level signal at this time is the third voltage V3. Since the comparison signal output by the comparison module 13 is the third voltage V3, the first field effect transistor M1 is fully turned on according to the third voltage V3, thereby not limiting the target current, allowing the target current to flow completely through the load 30.
[0057] When the target current is large, that is, the target current is greater than or equal to the current limit value, then the first current obtained after sampling by the current sampling module 12 is also large. Therefore, the first voltage generated by the first resistor module 40 according to the first current is also large. When the first voltage is large, the comparison signal output by the second operational amplifier AMP2 becomes a signal lower than the high-level signal, that is, the voltage of the comparison signal output at this time is less than the third voltage V3. Then the voltage at the gate of the first field effect transistor M1 will decrease, and the first field effect transistor M1 will not be fully turned on, thereby limiting the target current to the current limit value, thereby protecting the load 30 from the impact of large current. It should be noted that when the target current is large, the second operational amplifier AMP2 will clamp the voltage at its first input terminal Vn to the preset reference voltage VREF, thereby limiting the current flowing through the load 30 to the current limit value.
[0058] For example, Figure 4 As shown, the comparison module 13 further includes a first resistor R1, a first end of the first resistor R1 is electrically connected to the first input end of the second operational amplifier AMP2, and a second end of the first resistor R1 is electrically connected to the output end of the current sampling module 12 and the first resistor module 40 respectively. Figure 4 It can be seen that the second end of the first resistor R1 is electrically connected to the drain of the third field effect transistor M3. Specifically, the first resistor R1 mainly plays a protective role.
[0059] In some embodiments, as Figure 5 As shown, the current control circuit 10 also includes an anti-backflow module 15 and a second resistor module 16. The first end of the anti-backflow module 15 is electrically connected to the output end of the charge pump module 14, the first end of the second resistor module 16, and the power supply end of the comparison module 13, respectively. The second end of the anti-backflow module 15 is electrically connected to the load end of the current control module 11, the input end of the charge pump module 14, and the second input end of the current sampling module 12, respectively. The third end of the anti-backflow module 15 is used to be electrically connected to the load 30, and the second end of the second resistor module 16 is electrically connected to the current control end of the current control module 11, the first input end of the current sampling module 12, and the output end of the comparison module 13. The anti-backflow module 15 is used to prevent the target current from flowing from the load 30 to the power supply module 20. The second resistor module 16 is used to isolate the third voltage and the comparison signal.
[0060] Specifically, in actual applications, there may be a situation where the voltage on the load 30 is greater than the supply voltage output by the power module 20, and then current will flow from the load 30 to the power module 20. Therefore, the present application provides an anti-backflow module 15 to prevent current from flowing from the load 30 to the power module 20.
[0061] For example, Figure 6As shown, the second resistor module 16 includes a second resistor R2, the first end of the second resistor R2 is electrically connected to the output end of the charge pump module 14, the first end of the anti-backflow module 15 and the power supply end of the second operational amplifier AMP2, and the second end of the second resistor R2 is electrically connected to the gate of the first field effect transistor M1, the gate of the second field effect transistor M2 and the output end of the second operational amplifier AMP2.
[0062] Specifically, when the target current is small, that is, the target current is less than the current limit value, then the first current obtained after sampling by the current sampling module 12 is also small. Therefore, the first voltage generated by the first resistor module 40 based on the first current is also small. When the first voltage is small, the comparison signal output by the second operational amplifier AMP2 is a high-level signal, and the voltage of the high-level signal at this time is the third voltage V3. Then the voltage at both ends of the second resistor R2 is the third voltage V3, and no current will be generated on the second resistor R2, that is, no voltage drop will be generated on the second resistor R2. Then the first field effect transistor M1 is fully turned on according to the third voltage V3, thereby not limiting the target current, allowing the target current to flow completely through the load 30.
[0063] When the target current is large, that is, the target current is greater than or equal to the current limit value, then the first current obtained after sampling by the current sampling module 12 is also large. Therefore, the first voltage generated by the first resistor module 40 according to the first current is also large. When the first voltage is large, the comparison signal output by the second operational amplifier AMP2 becomes a signal lower than the high-level signal, that is, the voltage of the comparison signal output at this time is less than the third voltage V3. Then the voltages at both ends of the second resistor R2 are no longer equal, and a current will be generated on the second resistor R2, that is, a voltage drop will be generated on the second resistor R2. Therefore, the voltage at the gate of the first field effect transistor M1 will decrease, and the first field effect transistor M1 will not be fully turned on, thereby limiting the target current to within the current limit value, thereby protecting the load 30 from the impact of large current.
[0064] For example, Figure 6 As shown, the anti-backflow module 15 includes a fourth field effect transistor M4, the gate of the fourth field effect transistor M4 is electrically connected to the output end of the charge pump module 14, the power supply end of the comparison module 13 and the first end of the second resistor module 16 respectively, the source and substrate of the fourth field effect transistor M4 are electrically connected to the load end of the current control module 11, the input end of the charge pump module 14 and the second input end of the current sampling module 12, and the drain of the fourth field effect transistor M4 is used to be electrically connected to the load 30. Figure 6As can be seen, the gate of the fourth field-effect transistor M4 is electrically connected to the output terminal of the charge pump module 14, the power supply terminal of the second operational amplifier AMP2, and the first end of the second resistor R2. The source of the fourth field-effect transistor M4 and the substrate of the fourth field-effect transistor M4 are both electrically connected to the source of the first field-effect transistor M1, the input terminal of the charge pump module 14, and the second input terminal of the first operational amplifier AMP1.
[0065] Specifically, the fourth FET M4 is driven by the third voltage V3 output by the charge pump module 14. To prevent the signal at the gate of the first FET M1 from affecting the signal at the gate of the fourth FET M4, the present application provides a second resistor R2 to prevent interference.
[0066] like Figure 6 As shown, the first field effect transistor M1 has a parasitic diode, and the fourth field effect transistor M4 also has a parasitic diode. When working, the channels of the first field effect transistor M1 and the fourth field effect transistor M4 are turned on. When not working, if there is no fourth field effect transistor M4, when the voltage on the load 30 is greater than the supply voltage output by the power module 20, the parasitic diode in the first field effect transistor M1 will be turned on, and then the current will flow from the load 30 to the power module 20. Therefore, in order to prevent current backflow, the present application provides a fourth field effect transistor M4. When the voltage on the load 30 is greater than the supply voltage output by the power module 20, the parasitic diode in the fourth field effect transistor M4 is reversely connected, thereby preventing current from flowing from the load 30 to the power module 20.
[0067] In summary, the current control circuit 10 provided in this application effectively avoids load damage and safety hazards caused by abnormal current flow by monitoring and regulating the current flowing through the load in real time. Furthermore, the circuit has the advantages of simple structure, ease of implementation, and low cost, making it suitable for a variety of electronic devices that require precise current control.
[0068] The present application also provides a power supply chip including the current control circuit described above. A pin is connected between a comparison module and a current sampling module in the current control circuit to serve as an external resistor pin of the power supply chip. The external resistor pin of the power supply chip is electrically connected to a first resistor module. Because the power supply chip provided by the present application includes the current control circuit described above, the power supply chip provided by the present application can monitor and adjust the current flowing through the load in real time, effectively avoiding load damage and safety hazards caused by abnormal current flow.
[0069] The present application also provides a power supply system. Figure 7 As shown, the power system 60 includes a first resistor module 40 and the power chip 50 described above. The first resistor module 40 is electrically connected to the external resistor pin PAD_R in the power chip 50 .
[0070] Specifically, because the power supply system provided in the embodiment of the present application includes the power supply chip described above, the power supply system provided in the embodiment of the present application can monitor and adjust the current flowing through the load in real time, effectively avoiding load damage and safety hazards caused by abnormal current. At the same time, because the power supply system provided in the embodiment of the present application also includes a first resistor module, the power supply system can adjust the resistance value of the first resistor module according to actual conditions, and thus adjust the current limit value to adapt to different loads.
[0071] The present invention also provides a vehicle including the power supply system described above. Since the vehicle provided in the present invention adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0072] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.
[0073] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.
Claims
1. A current control circuit, characterized in that: The current control circuit includes a current sampling module, a current sampling module, and a comparison module. The current control module is electrically connected to the current sampling module, the comparison module, the power supply module, and the load respectively. The comparison module is electrically connected to the current sampling module and a first resistance module respectively. The first resistance module is an external resistance module of the current control circuit. The current sampling module is used to sample the target current and output a first current according to the target current, wherein the target current is the current output by the current control module; The comparison module is configured to output a comparison signal to the current control module according to a first voltage and a preset reference voltage, wherein the first voltage is a voltage generated by the first resistance module according to the first current; The current control module is used to adjust the target current according to the comparison signal.
2. The current control circuit according to claim 1, characterized in that: The current control circuit further includes a charge pump module, which is electrically connected to the comparison module, the current control module, the current sampling module and the load respectively; The current control module is used to output a second voltage to the charge pump module; the charge pump module is used to convert the second voltage into a third voltage to supply power to the comparison module.
3. The current control circuit according to claim 2, characterized in that: The current control module includes a first field-effect transistor, the gate of the first field-effect transistor is electrically connected to the current sampling module and the comparison module respectively, the drain of the first field-effect transistor is used to be electrically connected to the power supply module, and the source of the first field-effect transistor is electrically connected to the substrate of the first field-effect transistor, the current sampling module, the charge pump module and the load respectively.
4. The current control circuit according to claim 3, characterized in that: The current sampling module includes a second field-effect transistor, a third field-effect transistor, and a first operational amplifier. The gate of the second field-effect transistor is electrically connected to the gate of the first field-effect transistor, the drain of the second field-effect transistor is used to be electrically connected to the power supply module, the source of the second field-effect transistor is electrically connected to the first input terminal of the first operational amplifier and the source of the third field-effect transistor, respectively, the substrate of the second field-effect transistor is electrically connected to the substrate of the first field-effect transistor and the second input terminal of the first operational amplifier, respectively, the output terminal of the first operational amplifier is electrically connected to the gate of the third field-effect transistor, the power terminal of the first operational amplifier is used to receive a power supply voltage, the ground terminal of the first operational amplifier is grounded, the substrate of the third field-effect transistor is used to receive the power supply voltage, and the drain of the third field-effect transistor is electrically connected to the comparison module and the first resistance module, respectively.
5. The current control circuit according to claim 2, characterized in that: The comparison module includes a second operational amplifier, a first input end of the second operational amplifier is electrically connected to the current sampling module and the first resistance module respectively, a second input end of the second operational amplifier is used to receive a preset reference voltage, an output end of the second operational amplifier is electrically connected to the current control module and the current sampling module respectively, a power supply end of the second operational amplifier is electrically connected to the charge pump module, and a ground end of the second operational amplifier is grounded.
6. The current control circuit according to any one of claims 1 to 5, characterized in that: The current control circuit further includes an anti-backflow module and a second resistance module, the anti-backflow module is electrically connected to the current control module, the load, the charge pump module, the comparison module, the second resistance module and the current sampling module respectively, and the second resistance module is electrically connected to the current control module, the current sampling module and the comparison module respectively; The anti-backflow module is used to prevent the target current from flowing from the load to the power module; the second resistance module is used to isolate the third voltage and the comparison signal.
7. The current control circuit according to claim 6, characterized in that: The anti-backflow module includes a fourth field-effect transistor, the gate of the fourth field-effect transistor is electrically connected to the charge pump module, the comparison module and the second resistance module respectively, the source of the fourth field-effect transistor and the substrate of the fourth field-effect transistor are electrically connected to the current control module, the current sampling module and the charge pump module, and the drain of the fourth field-effect transistor is used to be electrically connected to the load.
8. A power chip, characterized in that: The current control circuit comprises the current control circuit according to any one of claims 1 to 7, wherein a pin is led out at the connection between the comparison module and the current sampling module in the current control circuit as the external resistor pin of the power supply chip, and the external resistor pin of the power supply chip is used to be electrically connected to the first resistor module.
9. A power supply system, characterized in that: The device comprises a first resistor module and the power chip according to claim 8, wherein the first resistor module is electrically connected to an external resistor pin in the power chip.
10. A vehicle, characterized in that: Includes the power supply system according to claim 9.