Over-temperature automatic protection circuit and C TO C data line

Abstract

The utility model discloses an over-temperature automatic protection circuit, which belongs to the technical field of adapter charging and comprises a first thermistor for detecting the temperature of a charging port of electronic equipment and outputting a resistance value related to the temperature to a main control chip of the electronic equipment; the circuit further comprises a first switch and a second switch, the first input end of the first switch is connected with a first voltage, the second input end of the first switch is grounded, the output end of the first switch is connected with a signal CC1 of a C TO C data line, and the control end of the first switch is connected with a driving signal output by the main control chip. The first input end of the first switch is connected with a first voltage, the second input end of the second switch is grounded, the output end of the first switch is connected with a signal CC2 of a C TO C data line, and the control end of the second switch is connected with a driving signal output by the main control chip. According to the utility model, power output can be automatically stopped when the temperature is too high.

Description

Technical Field

[0001] The utility model relates to the technical field of adapter charging, and particularly to an over-temperature automatic protection circuit. Background Art

[0002] At present, when charging electronic devices such as power banks and mobile phones with high power, an adapter is often used in combination with a C to C data cable to achieve the charging through the PD protocol. If a non-standard adapter is used, or the charging ports of electronic devices such as power banks and mobile phones are short-circuited due to reasons such as water ingress, dirt, or foreign objects, problems such as heat generation and heat loss will occur around the charging port, and in more serious cases, there will be a risk of fire. Summary of the Utility Model

[0003] To solve the above problems, the utility model provides an over-temperature automatic protection circuit, which actively cuts off the charging path through the PD protocol when the temperature of the charging port rises abnormally, so as to avoid heat loss.

[0004] To achieve the above object, the technical solution of the utility model is as follows:

[0005] An over-temperature automatic protection circuit includes a first thermistor, which detects the temperature of the charging port of the electronic device and outputs a resistance value related to the temperature to the main control chip of the electronic device;

[0006] It further includes a first switch and a second switch. The first input terminal of the first switch is connected to a first voltage, the second input terminal of the first switch is grounded, the output terminal of the first switch is connected to the signal CC1 of the C to C data cable, and the control terminal of the first switch is connected to the driving signal output by the main control chip of the electronic device; the first input terminal of the second switch is connected to the first voltage, the second input terminal of the second switch is grounded, the output terminal of the second switch is connected to the signal CC2 of the C to C data cable, and the control terminal of the second switch is connected to the driving signal output by the main control chip of the electronic device.

[0007] The above-mentioned over-temperature automatic protection circuit further includes a first resistor, and the first input terminal of the first switch is connected to the first voltage through the first resistor.

[0008] The above-mentioned over-temperature automatic protection circuit further includes a second resistor, and the first input terminal of the second switch is connected to the first voltage through the second resistor.

[0009] The above-mentioned over-temperature automatic protection circuit further includes a third resistor, and the second input terminal of the first switch is grounded through the third resistor.

[0010] The above-mentioned over-temperature automatic protection circuit further includes a fourth resistor, and the second input terminal of the second switch is grounded through the fourth resistor.

[0011] In a specific embodiment, the first thermistor is an NTC resistor.

[0012] In a specific embodiment, the first thermistor is disposed near the charging port of the electronic device.

[0013] In a specific embodiment, the electronic device is a mobile phone or a mobile power supply.

[0014] The present utility model further provides a C TO C data cable, including the above-mentioned over-temperature automatic protection circuit, and the adapter is connected to the electronic device through the C TO C data cable.

[0015] Beneficial effects: For the over-temperature automatic protection circuit of the present utility model, when the temperature of the charging port is too high, it can switch the signals CC1 and CC2 of the C TO C data cable, thereby stopping the power output, ensuring that no heat loss is generated, and playing a protective role.

[0016] To make the above features and advantages of the utility model more obvious and understandable, specific embodiments are hereinafter given, and detailed descriptions are made in conjunction with the accompanying drawings as follows. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the application of an over-temperature automatic protection circuit of the present utility model to adapter charging.

[0018] Figure 2 It is a circuit schematic diagram of an over-temperature automatic protection circuit of the present utility model. Detailed Embodiments

[0019] To make the objectives and technical solutions of the embodiments of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0020] Figure 1 It is a schematic diagram of the application of an over-temperature automatic protection circuit of the present utility model to adapter charging. As Figure 1 shown, the adapter 2 is connected to the electronic device 4 through the C TO C data cable 3 for charging, and the over-temperature automatic protection circuit 1 is connected to the electronic device 4 and the C TO C data cable 3.

[0021] More specifically, the electronic device 4 includes a charging port 41, a power management chip 42, a main control chip 43, and a battery 44. Among them, the adapter 2 is connected to the charging port 41 through a C TO C data cable 3 to charge the electronic device 4; the main control chip 43 is connected to the power management chip 42, and the power management chip 42 is connected to the battery 44.

[0022] More specifically, the over-temperature automatic protection circuit 1 is connected to the charging port 41, detects the temperature T of the charging port 41 and outputs the resistance value R related to the temperature T to the main control chip 43; the main control chip 43 outputs a driving signal P1 to the over-temperature automatic protection circuit 1; the over-temperature automatic protection circuit 1 generates a signal CC1 and a signal CC2 to the C TO C data cable 3.

[0023] Optionally, the electronic device 4 is a mobile phone or a mobile power supply, etc.

[0024] Figure 2 It is a circuit schematic diagram of an over-temperature automatic protection circuit of the present invention. An over-temperature automatic protection circuit 1 of the present invention includes a thermistor R1. The thermistor R1 detects the temperature of the charging port 41 of the electronic device 4 and outputs the resistance value R related to the temperature T to the main control chip 43.

[0025] Optionally, the thermistor R1 is arranged near the charging port 41 of the electronic device 4.

[0026] In a specific embodiment, the thermistor R1 is an NTC resistor.

[0027] Furthermore, an over-temperature automatic protection circuit 1 of the present invention further includes a switch 11 and a switch 12. The first input terminal of the switch 11 is connected to the voltage Vcc through a resistor Rp1, the second input terminal of the switch 11 is grounded through a resistor Rd1, the output terminal of the switch 11 is connected to the signal CC1 of the C TO C data cable 3, and the control terminal of the switch 11 is connected to the driving signal P1; the first input terminal of the switch 12 is connected to the voltage Vcc through a resistor Rp2, the second input terminal of the switch 12 is grounded through a resistor Rd2, the output terminal of the switch 12 is connected to the signal CC2 of the C TO C data cable 3, and the control terminal of the switch 12 is connected to the driving signal P1.

[0028] Among them, the voltage Vcc plays a power supply role.

[0029] Next, continue to combine Figure 1 with Figure 2 to introduce the working principle of the present invention. Under normal circumstances, the signal CC1 is pulled down to the ground through the resistor Rd1, the signal CC2 is pulled down to the ground through the resistor Rd2, the adapter 2 charges the electronic device 4 through the C TO C data cable 3, and the power management chip 42 charges the battery 44 with the current maximum power.

[0030] When the charging port 41 is short-circuited due to reasons such as water ingress, dirt, foreign objects, etc., resulting in an abnormal increase in the temperature of the charging port 41, the thermistor R1 detects the temperature T of the charging port 41 and outputs a resistance value R related to the temperature. T to the main control chip 43, and the main control chip 43 determines the resistance value R. T is greater than the threshold value, it will output a drive signal P1 to control the switch 11 and the switch 12, so that the signal CC1 is pulled up to the voltage Vcc or presents a high impedance state through the resistor Rp1, and the signal CC2 is pulled up to the voltage Vcc or presents a high impedance state through the resistor Rp2. Through the PD protocol, the communication between the adapter 2 and the electronic device 4 is interrupted, and the power output to the electronic device 4 is stopped, avoiding damage to the device caused by the abnormal high temperature, so as to play a protective role.

[0031] When the abnormality is eliminated, the thermistor R1 detects the temperature T of the charging port 41 and outputs a resistance value R related to the temperature. T to the main control chip 43, and the main control chip 43 determines the resistance value R. T After it drops below the threshold value, it outputs a drive signal P1 to control the switch 11 and the switch 12, so that the signal CC1 is pulled down to the ground through the resistor Rd1, and the signal CC2 is pulled down to the ground through the resistor Rd2. The adapter 2 continues to charge the electronic device 4 through the CTO C data cable 3.

[0032] In a specific embodiment, an over-temperature automatic protection circuit 1 of the present utility model can also be arranged in the C TO C data cable 3.

[0033] Although the present utility model has been disclosed above with embodiments, it is not intended to limit the present utility model. Any person with ordinary knowledge in the technical field to which it belongs can make some changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to that defined by the appended patent application scope.

Claims

1. An automatic over-temperature protection circuit, characterized in that: It includes a first thermistor, which detects the temperature of the charging port of the electronic device and outputs a resistance value related to the temperature to the main control chip of the electronic device; it also includes a first switch and a second switch, the first input end of the first switch is connected to a first voltage, the second input end of the first switch is grounded, the output end of the first switch is connected to the signal CC1 of the C TO C data line, and the control end of the first switch is connected to the drive signal output by the main control chip of the electronic device; the first input end of the second switch is connected to the first voltage, the second input end of the second switch is grounded, the output end of the second switch is connected to the signal CC2 of the C TO C data line, and the control end of the second switch is connected to the drive signal output by the main control chip of the electronic device.

2. An over-temperature automatic protection circuit as claimed in claim 1, characterized in that: A first resistor is also included, and a first input end of the first switch is connected to a first voltage through the first resistor.

3. An over-temperature automatic protection circuit as claimed in claim 2, characterized in that: A second resistor is also included, and the first input end of the second switch is connected to the first voltage through the second resistor.

4. An over-temperature automatic protection circuit as claimed in claim 3, characterized in that: A third resistor is further included, and the second input terminal of the first switch is grounded through the third resistor.

5. An over-temperature automatic protection circuit as claimed in claim 4, characterized in that: A fourth resistor is further included, and the second input end of the second switch is grounded through the fourth resistor.

6. An over-temperature automatic protection circuit as claimed in claim 1, characterized in that: The first thermistor is an NTC resistor.

7. An over-temperature automatic protection circuit as claimed in claim 1, characterized in that: The first thermistor is arranged near the charging port of the electronic device.

8. An over-temperature automatic protection circuit as claimed in claim 1, characterized in that: The electronic device is a mobile phone or a mobile power source.

9. A C TO C data cable, characterized in that: It comprises an automatic over-temperature protection circuit as described in any one of claims 1-8, and the adapter is connected to the electronic device through the C TO C data cable.

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