A control circuit and electronic equipment for system overvoltage protection
By introducing an overvoltage detection module and shutdown mechanism into the Type-C PD 3.1 standard, the problem of insufficient overvoltage protection in the Type-C PD 3.0 standard is solved, achieving effective protection of system components and preventing damage and safety hazards.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LCFC HEFEI ELECTRONICS TECH
- Filing Date
- 2025-04-15
- Publication Date
- 2026-05-26
AI Technical Summary
The existing Type-C PD 3.0 standard has insufficient overvoltage protection and cannot cope with the higher input voltage in the Type-C PD 3.1 standard, which may cause system components to be damaged, burned, or smoked.
A control circuit for system overvoltage protection is designed, comprising an overvoltage detection module, a fast charging interface module, and a system power module. The overvoltage detection module detects the input voltage, and when it exceeds a preset threshold, disconnects the line between the fast charging interface module and the system power module, and optionally disconnects the line between the battery module and the system power module to prevent high voltage from entering.
It effectively prevents high voltage from damaging system components, avoiding damage and smoke, and protecting the safety and reliability of the system.
Smart Images
Figure CN224289330U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of overvoltage protection technology, and in particular to a control circuit and electronic device for system overvoltage protection. Background Technology
[0002] The existing Type-C PD 3.0 standard has a maximum power of 100W and supports outputs of 5V3A, 9V3A, 12V3A, 15V3A, and 20V5A, with a maximum voltage of 20V. Generally, Type-C PD 3.0 uses an NVCD (Narrow Voltage Direct Current) charger to transfer power to the system voltage of 6V-18V. Most common components have a withstand voltage of 25V-28V. Even if the buck high-side MOS of the NVCD charger fails, causing the maximum voltage of 20V from the Type-C PD 3.0 to flow into the system, the system components, with a withstand voltage of 25V-28V, will not damage the downstream components.
[0003] However, with the emergence of the new Type-C PD 3.1, the maximum power has been increased to 240W, and the input voltage has also been increased to 28V, 36V and 48V. If the Buck high side MOS of the NVCD charger is damaged and short-circuited, the high voltage of 28V, 36V and 48V will flow into the system components. Due to insufficient withstand voltage, it may cause damage, burnout or even smoke. Utility Model Content
[0004] This disclosure provides a control circuit and electronic device for system overvoltage protection, so as to at least solve the above-mentioned technical problems existing in the prior art.
[0005] According to a first aspect of this disclosure, a control circuit for system overvoltage protection is provided, wherein the control circuit includes:
[0006] Overvoltage detection module, fast charging interface module, and system power module;
[0007] One end of the overvoltage detection module is connected to the fast charging interface module, and the other end is connected to the system power module. The fast charging interface module is connected to the system power module. The overvoltage detection module is used to detect the first voltage input from the fast charging interface module to the system power module. When the first voltage is detected to be greater than a preset threshold, the module sends a shutdown signal to the fast charging interface module to disconnect the line between the fast charging interface module and the system power module.
[0008] In one possible implementation, the control circuit further includes:
[0009] The battery module has one end connected to the overvoltage detection module and the other end connected to the system power module. When the overvoltage detection module sends a shutdown signal to the fast charging interface module, it also sends a shutdown signal to the battery module to disconnect the line between the battery module and the system power module.
[0010] In one embodiment, the overvoltage detection module includes a first controller, which includes a detection pin, an input pin, and an output pin. The detection pin is connected to the first voltage and is used to detect the magnitude of the first voltage. The input pin is connected to the power supply voltage and is used to power the first controller. The output pin is connected to the fast charging interface module and the battery module and is used to issue a shutdown signal.
[0011] In one possible implementation, the control circuit further includes:
[0012] A first resistor, a second resistor, a first capacitor, and a second capacitor; wherein...
[0013] The first end of the first resistor is connected to the first voltage, and the second end is connected to the detection pin;
[0014] The first end of the second resistor is connected to the detection pin and the first end of the first capacitor, respectively, and the second end of the second resistor and the second end of the first capacitor are both grounded;
[0015] The first terminal of the second capacitor is connected to the input pin and the power supply voltage, respectively, and the second terminal of the second capacitor is grounded.
[0016] In one possible implementation, the preset threshold is greater than 23.8V.
[0017] In one possible implementation, the fast charging interface module includes a fast charging interface and a first switch;
[0018] The overvoltage detection module sends a shutdown signal to the fast charging interface module, including:
[0019] The overvoltage detection module sends a shutdown signal to the first switch to disconnect the first switch.
[0020] In one possible implementation, the battery module includes a battery and a first transistor;
[0021] The overvoltage detection module sends a shutdown signal to the battery module, including:
[0022] The overvoltage detection module sends a shutdown signal to the first transistor to turn it off.
[0023] In one possible implementation, the control circuit further includes:
[0024] A battery charging control module, one end of which is connected to the fast charging interface module and the other end of which is connected to the system power module; the output voltage of the fast charging interface module is output as the first voltage through the battery charging control module.
[0025] In one embodiment, the battery charging control module includes a battery charging controller, a buck transistor, an inductor, and a boost transistor; one end of the battery charging controller is connected to the buck transistor, and the other end is connected to the boost transistor; one end of the buck transistor is connected to the fast charging interface module, and the other end is connected to the inductor; one end of the boost transistor is connected to the inductor, and the other end is connected to the system power module.
[0026] According to a second aspect of this disclosure, an electronic device is provided, including a control circuit as described in any of the above embodiments.
[0027] The control circuit and electronic equipment for system overvoltage protection disclosed herein, by adding an overvoltage detection module, will immediately issue a shutdown signal when the first voltage input to the system power module exceeds a preset threshold, thereby disconnecting the line between the fast charging interface module and the system power module, preventing high voltage from penetrating to parts of the system components with low voltage resistance, and avoiding damage, burnout, smoke, etc.
[0028] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description
[0029] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which:
[0030] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.
[0031] Figure 1 A schematic diagram of the control circuit for system overvoltage protection provided in this embodiment of the disclosure;
[0032] Figure 2 A circuit diagram of the control circuit for system overvoltage protection provided in the embodiments of this disclosure;
[0033] Figure 3 This is a timing diagram of the control circuit's operation. Detailed Implementation
[0034] To make the objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.
[0035] This disclosure provides a control circuit for system overvoltage protection. Figure 1 A schematic diagram of the control circuit for system overvoltage protection provided in this embodiment of the disclosure is shown below. Figure 1 As shown, the control circuit includes:
[0036] Overvoltage detection module 10, fast charging interface module 20, and system power module 30;
[0037] One end of the overvoltage detection module 10 is connected to the fast charging interface module 20, and the other end is connected to the system power module 30. The fast charging interface module 20 is connected to the system power module 30. The overvoltage detection module 10 is used to detect the first voltage input from the fast charging interface module 20 to the system power module 30. When the detected first voltage is greater than a preset threshold, it sends a shutdown signal to the fast charging interface module 20 to disconnect the line between the fast charging interface module 20 and the system power module 30.
[0038] In one embodiment, the control circuit further includes a battery module 40, one end of which is connected to the overvoltage detection module 10 and the other end of which is connected to the system power module 30; when the overvoltage detection module 10 sends a shutdown signal to the fast charging interface module 20, it also sends a shutdown signal to the battery module 40 to disconnect the line between the battery module 40 and the system power module 30.
[0039] Figure 2 A circuit diagram of the control circuit for system overvoltage protection provided in an embodiment of this disclosure.
[0040] In one embodiment, such as Figure 2 As shown, the overvoltage detection module 10 includes a first controller U1, which includes a detection pin SENCE, an input pin VDD, and an output pin. The detection pin SENCE is connected to the first voltage VSYS18 and is used to detect the magnitude of the first voltage VSYS18. The input pin VDD is connected to the supply voltage VCC3SW and is used to power the first controller U1. The output pin... It connects to the fast charging interface module 20 and the battery module 40 to send a shutdown signal.
[0041] Under normal operating conditions, the first voltage VSYS18 ranges from 12.3V to 18V. The supply voltage VCC3SW is 3.3V.
[0042] The first controller U1 also includes other pins, such as the capacitor time pin CT and the reset pin. And the ground pin GND, where the capacitor time pin CT is used to adjust the reset time delay, and the reset pin Floating, ground pin GND is grounded.
[0043] The first controller U1 can be a TPS3870J4080DSERQ1 chip.
[0044] The undervoltage lockout voltage UVLO of the first controller U1 is 1.2V to 1.7V.
[0045] like Figure 2 As shown, the control circuit also includes: a first resistor R1, a second resistor R2, a first capacitor C1, and a second capacitor C2; wherein,
[0046] The first end of the first resistor R1 is connected to the first voltage VSYS18, and the second end is connected to the detection pin SENCE.
[0047] The first end of the second resistor R2 is connected to the detection pin SENCE and the first end of the first capacitor C1 respectively, and the second end of the second resistor R2 and the second end of the first capacitor C1 are both grounded.
[0048] The first terminal of the second capacitor C2 is connected to the input pin VDD and the power supply voltage VCC3SW, respectively, and the second terminal of the second capacitor C2 is grounded.
[0049] In one embodiment, the first resistor R1 is a pull-up resistor and the second resistor R2 is a pull-down resistor. The resistance of the first resistor is 100KΩ and the resistance of the second resistor is 3.48KΩ.
[0050] The capacitance of the first capacitor is 0.1μF, and the capacitance of the second capacitor is 1μF.
[0051] like Figure 2 As shown, the control circuit also includes: a third resistor R3, a fourth resistor R4, and a third capacitor C3. The first end of the third resistor R3 is connected to the capacitor time pin CT, the first end of the third capacitor C3, and the first end of the fourth resistor R4, respectively. The second end of the third resistor R3 and the second end of the second capacitor C2 are both grounded. The second end of the fourth resistor R4 is connected to the OTP_RESET signal.
[0052] The resistance of the third resistor R3 is 10KΩ, the resistance of the fourth resistor R4 is 10KΩ, and the capacitance of the third capacitor C3 is 0.1μF.
[0053] In this disclosure, Figure 2 The resistors and capacitors shown can be used to adjust the range of preset thresholds for better protection of the system power module.
[0054] In one embodiment, the preset threshold is greater than 23.8V.
[0055] Figure 3 This is a timing diagram of the control circuit's operation.
[0056] In this embodiment of the disclosure, a power supply is used to simulate a scenario where the first voltage exceeds a preset threshold, such as... Figure 3 As shown, when the detection pin SENCE of the first controller U1 detects that the first voltage VSYS18 input to the system power module 30 exceeds 23.8V, the output pin... When the shutdown signal turns low, the fast charging interface module will be shut down to prevent damage to the system power module.
[0057] In one embodiment, such as Figure 1 As shown, the fast charging interface module 20 includes a fast charging interface 21 and a first switch 22;
[0058] The overvoltage detection module 10 sends a shutdown signal to the fast charging interface module 20, including:
[0059] The overvoltage detection module 10 sends a shutdown signal to the first switch 22 to disconnect the first switch 22.
[0060] In this embodiment, multiple fast charging interface modules 20 may be included, each of which includes a fast charging interface 21 and a first switch 22. During operation, when a fast charging interface module 20 is used, its first switch 22 is turned off upon issuing a shutdown signal, thereby disconnecting the line from the fast charging interface module 20 to the system power module 30.
[0061] The fast charging port 21 can be a Type-C PD3.1 port. The first switch 42 can be a BTB (Board-to-Board) switch.
[0062] In one embodiment, such as Figure 1 As shown, the battery module 40 includes a battery 41 and a first transistor 42;
[0063] The overvoltage detection module 10 sends a shutdown signal to the battery module 40, including: the overvoltage detection module 10 sends a shutdown signal to the first transistor 42 to turn off the first transistor 42.
[0064] In this embodiment, since the first voltage VSYS18 is used to charge and discharge the battery 41, the first transistor 41 must be turned off when the first voltage VSYS18 exceeds a preset threshold. In this way, the line between the battery 41 and the system power module 30 is disconnected, which can ensure that the first voltage VSYS18 will not damage the battery 41, and also ensure that the voltage output from the battery 41 will not damage the system power module 30.
[0065] In one embodiment, the control circuit further includes a battery charging control module 50, one end of which is connected to the fast charging interface module 20 and the other end of which is connected to the system power module 30; the output voltage of the fast charging interface module 20 is output as a first voltage VSYS18 through the battery charging control module 50.
[0066] In one embodiment, the battery charging control module 50 includes a battery charging controller 51, a buck transistor 52, an inductor 53, and a boost transistor 54; one end of the battery charging controller 51 is connected to the buck transistor 52, and the other end is connected to the boost transistor 54; one end of the buck transistor 51 is connected to the fast charging interface module 20, and the other end is connected to the inductor 53; one end of the boost transistor 54 is connected to the inductor 53, and the other end is connected to the system power module 30.
[0067] In this embodiment, the battery charging control module 50 is the buck & boost circuit (step-down and step-up circuit) of the charger. The voltage output by the fast charging interface 41 needs to be output as the first voltage VSYS18 through this circuit and then enter the system power module 30.
[0068] The battery charging controller 51 can be used for NVCD (Narrow Voltage Direct Current) chargers.
[0069] In one embodiment, the control circuit further includes a system 60 connected to the system power module 30. A first voltage VSYS18 enters the system 60 via the system power module 30.
[0070] This disclosure also provides an electronic device including the control circuit described in any of the above embodiments.
[0071] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and this is not limited herein.
[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.
[0073] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.
Claims
1. A control circuit for system overvoltage protection, characterized in that, The control circuit includes: Overvoltage detection module, fast charging interface module, and system power module; One end of the overvoltage detection module is connected to the fast charging interface module, and the other end is connected to the system power module. The fast charging interface module is connected to the system power module. The overvoltage detection module is used to detect the first voltage input from the fast charging interface module to the system power module. When the first voltage is detected to be greater than a preset threshold, the module sends a shutdown signal to the fast charging interface module to disconnect the line between the fast charging interface module and the system power module.
2. The control circuit of claim 1, wherein, The control circuit also includes: The battery module has one end connected to the overvoltage detection module and the other end connected to the system power module. When the overvoltage detection module sends a shutdown signal to the fast charging interface module, it also sends a shutdown signal to the battery module to disconnect the line between the battery module and the system power module.
3. The control circuit according to claim 2, characterized in that, The overvoltage detection module includes a first controller, which includes a detection pin, an input pin, and an output pin. The detection pin is connected to the first voltage and is used to detect the magnitude of the first voltage. The input pin is connected to the power supply voltage and is used to power the first controller. The output pin is connected to the fast charging interface module and the battery module and is used to send a shutdown signal.
4. The control circuit of claim 3, wherein, The control circuit also includes: A first resistor, a second resistor, a first capacitor, and a second capacitor; wherein... The first end of the first resistor is connected to the first voltage, and the second end is connected to the detection pin; The first end of the second resistor is connected to the detection pin and the first end of the first capacitor, respectively, and the second end of the second resistor and the second end of the first capacitor are both grounded; The first terminal of the second capacitor is connected to the input pin and the power supply voltage, respectively, and the second terminal of the second capacitor is grounded.
5. The control circuit according to claim 1, characterized in that, The preset threshold is greater than 23.8V.
6. The control circuit according to claim 1, characterized in that, The fast charging interface module includes a fast charging interface and a first switch; The overvoltage detection module sends a shutdown signal to the fast charging interface module, including: The overvoltage detection module sends a shutdown signal to the first switch to disconnect the first switch.
7. The control circuit according to claim 2, characterized in that, The battery module includes a battery and a first transistor; The overvoltage detection module sends a shutdown signal to the battery module, including: The overvoltage detection module sends a shutdown signal to the first transistor to turn it off.
8. The control circuit according to claim 1, characterized in that, The control circuit also includes: A battery charging control module, one end of which is connected to the fast charging interface module and the other end of which is connected to the system power module; the output voltage of the fast charging interface module is output as the first voltage through the battery charging control module.
9. The control circuit according to claim 8, characterized in that, The battery charging control module includes a battery charging controller, a buck transistor, an inductor, and a boost transistor; one end of the battery charging controller is connected to the buck transistor, and the other end is connected to the boost transistor; one end of the buck transistor is connected to the fast charging interface module, and the other end is connected to the inductor; one end of the boost transistor is connected to the inductor, and the other end is connected to the system power module.
10. An electronic device, characterized in that, Includes the control circuit as described in any one of claims 1-9.