Overheat protection circuit and sound card connector
By designing an overheating protection circuit and using a detection module and MOS tube to cut off the external power input, the overheating problem of the sound card during fast charging is solved, safety and energy loss are reduced, and product life is extended.
Patent Information
- Application Number
- CN202422612212.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-10-28
AI Technical Summary
Existing sound cards can overheat during fast charging, leading to energy loss and safety risks, potentially damaging the product or even causing a fire.
An overheat protection circuit is designed, which includes an adapter interface, a device interface, a sound card interface, a control module, a detection module and a MOS tube. The detection module monitors the temperature, and the control module controls the MOS tube to cut off the external power input to achieve overheat protection.
Effectively prevent sound cards from overheating and catching fire, reduce energy loss, extend product life, and improve safety and utilization.
Smart Images
Figure CN223363823U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sound card connectors, in particular to an overheat protection circuit and a sound card connector. Background Art
[0002] With the rapid expansion of fast charging protocols and the widespread popularity of high-current charging, sound cards with fast charging functions have appeared on the market. However, such sound cards may overheat when charging using the fast charging protocol. Excessive product temperature will lead to a large amount of energy loss, and excessive temperature can easily damage the product. More seriously, there may be a risk of fire.
[0003] Therefore, designing an overheat protection circuit and a sound card connector is very important to those skilled in the art. Utility Model Content
[0004] The technical problem to be solved by the embodiments of the present invention is to provide an overheating protection circuit and a sound card connector to solve the problem in the prior art that the product temperature is too high, resulting in a large amount of energy loss, which is easy to damage the product and even cause a fire.
[0005] The utility model discloses an overheat protection circuit, which includes: an adapter interface, a device interface, a sound card interface, a control module, a detection module, a first MOS transistor and a second MOS transistor; the adapter interface is electrically connected to the device interface and the sound card interface respectively, the detection module is inductively connected to the connected PD sound card, the input end of the control module is connected to the output end of the detection module, the output end of the control module is connected to the gate of the first MOS transistor, the source of the first MOS transistor is grounded, the drain of the first MOS transistor is connected to the gate of the second MOS transistor, the source of the second MOS transistor is connected to the sound card interface, and the drain of the second MOS transistor is connected to the device interface.
[0006] Optionally, a protocol chip is further included, and the protocol chip is respectively connected to the gate of the first MOS tube, the device interface and the adapter interface.
[0007] Optionally, a third MOS tube and a fourth MOS tube are further included, the gate of the third MOS tube is connected to the protocol chip, the source of the third MOS tube is grounded, the drain of the third MOS tube is connected to the gate of the fourth MOS tube, the drain of the fourth MOS tube is connected to the adapter interface, and the source of the fourth MOS tube is connected to the sound card interface.
[0008] Optionally, a DC-DC module is further included, wherein the voltage input end of the DC-DC module is connected to the device interface and the adapter interface respectively, and the voltage output end of the DC-DC module is used to connect to the internal module for power supply.
[0009] Optionally, an LDO step-down module is further included, wherein the voltage input end of the LDO step-down module is connected to the voltage output end of the DC-DC module, and the voltage output end of the LDO step-down module is connected to the detection module and the control module respectively.
[0010] Optionally, an indicator light module is further included, and the indicator light module is connected to the control module for overheating display.
[0011] Optionally, a data transmission pin is further provided on the device interface for connecting to a PD sound card and transmitting data.
[0012] Optionally, a first protection diode is provided on the drain of the second MOS transistor.
[0013] Optionally, a second protection diode is provided on the drain of the fourth MOS transistor.
[0014] In order to solve the problems existing in the prior art, the present invention also provides a sound card connector, which includes a shell and a circuit board, and the circuit board is provided with the overheating protection circuit as described above. The circuit board is arranged in the shell, and the adapter interface, the device interface and the sound card interface are exposed outside the shell.
[0015] Compared with the prior art, the beneficial effect of the overheating protection circuit provided by the embodiment of the present invention is that: by designing an overheating protection circuit, including an adapter interface, a device interface, a sound card interface, a control module, a detection module, a first MOS tube and a second MOS tube; the solution uses the detection module to collect temperature of the external sound card. When the temperature exceeds the set operating temperature, the external device automatically enters the overheating protection mechanism, and controls the first MOS tube to be turned off through the control module, thereby turning off the second MOS tube to cut off the input of the external power supply to prevent the connected device from overheating and catching fire. It also reduces the charging time of the connected device at high temperatures, avoids unnecessary energy loss of the product, and extends the service life of the product, which greatly improves the safety and utilization of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, in which:
[0017] Figure 1 This is a circuit diagram of an overheat protection circuit provided by an embodiment of the present utility model;
[0018] Figure 2 This is a circuit diagram of a detection module and a control module provided by an embodiment of the present utility model;
[0019] Figure 3 This is a circuit diagram of a protocol chip provided by an embodiment of the present utility model;
[0020] Figure 4 This is a circuit diagram of a DC-DC module provided by an embodiment of the present utility model;
[0021] Figure 5 It is a structural schematic diagram of a sound card connector provided by an embodiment of the utility model.
[0022] Reference numerals:
[0023] 100, adapter interface; 200, device interface; 300, sound card interface; 400, control module; 500, detection module; 600, protocol chip; 10, housing; 20, circuit board;
[0024] Q1, first MOS tube; Q2, second MOS tube; Q3, third MOS tube; Q4, fourth MOS tube; TVS1, first protection diode; TVS2, second protection diode. DETAILED DESCRIPTION
[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. Now, in conjunction with the accompanying drawings, a detailed description of the preferred embodiments of the present utility model will be given.
[0026] like Figures 1 to 4 As shown, the utility model provides a specific embodiment of an overheat protection circuit.
[0027] An overheat protection circuit, reference Figure 1 The overheat protection circuit includes an adapter interface 100, a device interface 200, a sound card interface 300, a control module 400, a detection module 500, a first MOS transistor Q1 and a second MOS transistor Q2.
[0028] Among them, reference Figure 1 The power supply terminal VBUS of the adapter interface 100 is respectively connected to the power supply terminal VBUS of the device interface 200 and the power supply terminal VBUS-IN of the sound card interface 300. The detection module 500 is used to collect the temperature of the PD sound card. The input terminal of the control module 400 is connected to the output terminal of the detection module 500. The output terminal of the control module 400 is connected to the gate G of the first MOS transistor Q1. The source S of the first MOS transistor Q1 is grounded. The drain D of the first MOS transistor Q1 is connected to the gate G of the second MOS transistor Q2. The source S of the second MOS transistor Q2 is connected to the sound card interface 300. The drain D of the second MOS transistor Q2 is connected to the power supply terminal VBUS of the device interface 200.
[0029] Specifically, refer to Figure 1The device interface 200 is used to connect external devices, such as mobile phones, the adapter interface 100 is used to connect an external power supply, and the sound card interface 300 is used to connect a PD sound card, which is a sound card with PD fast charging; the power supply end VBUS of the adapter interface 100 is connected to the power supply end VBUS of the device interface 200, and can be used to power the connected device. The power supply end VBUS of the adapter interface 100 is also connected to the power supply end VBUS-IN of the sound card interface 300, and can be used to power the sound card interface 300.
[0030] Further, refer to Figure 1 and Figure 2 The detection module 500 is specifically an NTC detection module for monitoring the temperature of the connected sound card. The signal input end of the control module 400 is connected to the signal output end of the detection module 500 to obtain the temperature information detected by the detection module 500.
[0031] Further, refer to Figure 1 A first MOS transistor Q1 and a second MOS transistor Q2 are provided between the power supply terminal VBUS of the adapter interface 100 and the power supply terminal VBUS of the device interface 200. The first MOS transistor Q1 is a control MOS transistor for controlling the on / off switching of the second MOS transistor Q2, and the second MOS transistor Q2 is a switch MOS transistor for controlling the on / off switching of the power supply circuit. A signal output terminal of the control module 400 is connected to the gate G of the first MOS transistor Q1 to output a corresponding voltage level to the gate G of the first MOS transistor Q1 based on received temperature information to control the on / off switching of the first MOS transistor Q1. A source S of the first MOS transistor Q1 is grounded, a drain D of the first MOS transistor Q1 is connected to the gate G of the second MOS transistor Q2, a source S of the second MOS transistor Q2 is connected to the sound card interface 300, and a drain D of the second MOS transistor Q2 is connected to the power supply terminal VBUS of the device interface 200.
[0032] When the external sound card is charging at high power, it will continuously generate heat. The detection module 500 continuously monitors its temperature and sends the information to the control module 400. When the sound card temperature exceeds the set operating temperature, the control module 400 will receive an overtemperature signal. The control module 400 will then send a corresponding level signal to the gate G of the first MOS transistor Q1 to control the first MOS transistor Q1 to be turned off. The drain D of the first MOS transistor Q1 will output a low level, and the gate G of the second MOS transistor Q2 will be pulled low, turning off the second MOS transistor Q2. The power of the adapter interface 100 will not be able to power the device connected to the device interface 200 through the second MOS transistor Q2, thereby achieving charging protection. The adapter interface 100 can still maintain power supply to the external sound card. Furthermore, because the second MOS transistor Q2 has a built-in parasitic diode, the device connected to the device interface 200 can also power the external sound card through the parasitic diode in the second MOS transistor Q2, ensuring that local music playback and other functions are not affected.
[0033] When the temperature of the external sound card drops, the detection module 500 will detect that the temperature has returned to the set operating temperature range. The control module 400 will output a corresponding voltage level to the gate G of the first MOS transistor Q1 to control the first MOS transistor Q1 to turn on, thereby controlling the second MOS transistor Q2 to turn on, so that the power of the adapter interface 100 can be supplied to the device connected to the device interface 200 through the second MOS transistor Q2, thereby realizing overheat protection of the product.
[0034] With the rapid expansion of fast charging protocols, high-current charging has become more popular. There is a phenomenon that sound cards with PD charging overheat during charging. Excessive product temperature will lead to a large amount of energy loss, and excessive temperature can easily damage the product. More seriously, there may be a risk of fire. Currently, there is no better overheating protection for such products.
[0035] In this embodiment, an overheat protection circuit is designed, including an adapter interface 100, a device interface 200, a sound card interface 300, a control module 400, a detection module 500, a first MOS transistor Q1, and a second MOS transistor Q2. This solution uses the detection module 500 to collect temperature data from the external sound card. When the temperature exceeds a set operating temperature, the external device automatically enters an overheat protection mechanism, which cuts off the input of external power through the first MOS transistor Q1 and the second MOS transistor Q2 to prevent the device from overheating and catching fire. This also reduces the charging time of the device at high temperatures, avoids unnecessary energy loss in the product, and extends the product's service life, significantly improving both product safety and utilization.
[0036] In one embodiment, reference Figure 3The overheat protection circuit further includes a protocol chip 600 , which is connected to the gate G of the first MOS transistor Q1 , the power supply terminal VBUS of the device interface 200 , and the power supply terminal VBUS of the adapter interface 100 , respectively.
[0037] Specifically, refer to Figure 3 The protocol chip 600 includes an A_VBUS_EN pin for connecting to the gate G of the first MOS tube Q1, an A_USB-C_VBUS_DET pin for connecting to the power supply end VBUS of the device interface 200, and a B_USB-C_VBUS_DET pin for connecting to the power supply end VBUS of the adapter interface 100 for fast charging protocol control.
[0038] In one embodiment, reference Figure 1 The overheat protection circuit further includes a third MOS transistor Q3 and a fourth MOS transistor Q4. The gate G of the third MOS transistor Q3 is connected to the protocol chip 600, the source S of the third MOS transistor Q3 is grounded, the drain D of the third MOS transistor Q3 is connected to the gate G of the fourth MOS transistor Q4, the drain D of the fourth MOS transistor Q4 is connected to the power supply terminal VBUS of the adapter interface 100, and the source S of the fourth MOS transistor Q4 is connected to the sound card interface 300.
[0039] Specifically, refer to Figure 1 and Figure 3 The third MOS transistor Q3 is a control MOS transistor. A source S of the third MOS transistor Q3 is grounded, and a gate G of the third MOS transistor Q3 is connected to the protocol chip 600. The protocol chip 600 is provided with a B_VBUS_EN pin for connecting to the third MOS transistor Q3. The source S of the third MOS transistor Q3 is grounded, and a drain D of the third MOS transistor Q3 is connected to the gate G of the fourth MOS transistor Q4 for controlling the on / off of the fourth MOS transistor Q4. The fourth MOS transistor Q4 is a switch MOS transistor. A gate G of the fourth MOS transistor Q4 is connected to the drain D of the third MOS transistor Q3 to obtain a control level signal. A source S of the fourth MOS transistor Q4 is connected to the sound card interface 300, and a drain D of the fourth MOS transistor Q4 is connected to the power supply terminal VBUS of the adapter interface 100 for controlling the on / off of the charging circuit between the adapter interface 100 and the sound card interface 300.
[0040] In one embodiment, reference Figure 4 The overheat protection circuit also includes a DC-DC module, the voltage input end of the DC-DC module is connected to the power supply end VBUS of the device interface 200 and the adapter interface 100 respectively, and the voltage output end of the DC-DC module is used to connect the internal module for power supply.
[0041] Specifically, refer to Figure 4The DC-DC module is used to step down the voltage to 5V to power other functional modules within the system.
[0042] In one embodiment, the overheat protection circuit further includes an LDO buck module, wherein the voltage input end of the LDO buck module is connected to the voltage output end of the DC-DC module, and the voltage output end of the LDO buck module is connected to the detection module 500 and the control module 400 respectively.
[0043] Specifically, the LDO step-down module is used to step down the voltage to 3.3V to power the detection module 500 .
[0044] In one embodiment, the overheat protection circuit further includes an indicator light module, which is connected to the control module 400 for indicating overheating.
[0045] In one embodiment, reference Figure 1 The device interface 200 is also provided with a data transmission pin for connecting to a PD sound card and transmitting data.
[0046] Specifically, refer to Figure 1 The device interface 200 is provided with a DM pin and a DP pin for connecting to a PD sound card and transmitting data.
[0047] In one embodiment, reference Figure 1 A first protection diode TVS1 is provided on the drain electrode D of the second MOS transistor Q2; a second protection diode TVS2 is provided on the drain electrode D of the fourth MOS transistor Q4.
[0048] Specifically, refer to Figure 1 The first protection diode TVS1 and the second protection diode TVS2 are both transient suppression diodes used for lightning protection, overvoltage protection, anti-interference and surge power absorption.
[0049] like Figure 5 As shown, the utility model also provides a specific embodiment of a sound card connector.
[0050] A sound card connector, reference Figure 5 The sound card connector includes a shell 10 and a circuit board 20. The circuit board 20 is provided with the above-mentioned overheat protection circuit. The circuit board 20 is arranged in the shell 10, and the adapter interface 100, the device interface 200 and the sound card interface 300 are exposed outside the shell 10.
[0051] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Those skilled in the art may modify the technical solutions described in the above embodiments, or replace some of the technical features therein with equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present invention.
Claims
1. An overheat protection circuit, characterized in that: include: An adapter interface, a device interface, a sound card interface, a control module, a detection module, a first MOS transistor, and a second MOS transistor; the adapter interface is electrically connected to the device interface and the sound card interface respectively, the detection module is inductively connected to the connected PD sound card, the input end of the control module is connected to the output end of the detection module, the output end of the control module is connected to the gate of the first MOS transistor, the source of the first MOS transistor is grounded, the drain of the first MOS transistor is connected to the gate of the second MOS transistor, the source of the second MOS transistor is connected to the sound card interface, and the drain of the second MOS transistor is connected to the device interface.
2. The overheat protection circuit according to claim 1, characterized in that: It also includes a protocol chip, which is connected to the gate of the first MOS tube, the device interface and the adapter interface respectively.
3. The overheat protection circuit according to claim 2, characterized in that: It also includes a third MOS transistor and a fourth MOS transistor, wherein the gate of the third MOS transistor is connected to the protocol chip, the source of the third MOS transistor is grounded, the drain of the third MOS transistor is connected to the gate of the fourth MOS transistor, the drain of the fourth MOS transistor is connected to the adapter interface, and the source of the fourth MOS transistor is connected to the sound card interface.
4. The overheat protection circuit according to claim 1, characterized in that: It also includes a DC-DC module, wherein the voltage input end of the DC-DC module is connected to the device interface and the adapter interface respectively, so as to supply power to the internal modules.
5. The overheat protection circuit according to claim 4, characterized in that: It also includes an LDO buck module, the voltage input end of the LDO buck module is connected to the voltage output end of the DC-DC module, and the voltage output end of the LDO buck module is connected to the detection module and the control module respectively.
6. The overheat protection circuit according to claim 1, characterized in that: It also includes an indicator light module, which is connected to the control module for overheating display.
7. The overheat protection circuit according to claim 1, characterized in that: The device interface is also provided with a data transmission pin for connecting to a PD sound card and transmitting data.
8. The overheat protection circuit according to claim 1, characterized in that: A first protection diode is provided on the drain of the second MOS transistor.
9. The overheat protection circuit according to claim 3, characterized in that: A second protection diode is provided on the drain of the fourth MOS tube.
10. A sound card connector, characterized in that: It comprises a shell and a circuit board, the circuit board is provided with an overheating protection circuit as described in any one of claims 1-9, the circuit board is arranged in the shell, and the adapter interface, the device interface and the sound card interface are exposed outside the shell.