Over-temperature automatic power-off circuit and electronic equipment

Abstract

The utility model discloses an over-temperature automatic power-off 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 comprises an adapter, a first switch and a first capacitor, a first end of the first switch is connected with a first voltage, a second end of the first switch is connected with a first end of the first capacitor, a second end of the first capacitor outputs a current to the adapter, and a main control chip of the electronic equipment outputs a driving signal to a third end of the first switch. According to the over-temperature automatic power-off circuit provided by the utility model, when the temperature of the charging port is too high, a large current can be actively generated, and an adapter is externally triggered to generate over-current protection, so that power output is stopped, heat loss is ensured not to be generated, and a protection effect is achieved.

Description

Technical Field

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

[0002] When charging electronic devices such as power banks and mobile phones, you need to use an adapter with a charging cable (such as an A TO C data cable) to charge. If a non-standard adapter is used, or the charging port of an electronic device such as a power bank or mobile phone is short-circuited due to water ingress, dirt, or foreign matter, the area around the charging port may heat up and cause heat loss, and in more serious cases, there may be a risk of fire. Utility Model Content

[0003] In order to solve the above problem, the utility model provides an over-temperature automatic power-off circuit, which stops the output of the adapter when the temperature of the charging port is too high.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is:

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

[0006] It also includes a first switch and a first capacitor, wherein the first end of the first switch is connected to a first voltage, the second end of the first switch is connected to the first end of the first capacitor, the second end of the first capacitor outputs current to the adapter, and the main control chip of the electronic device outputs a driving signal to the third end of the first switch.

[0007] The above-mentioned over-temperature automatic power-off circuit also includes a second switch, a first end of the second switch is connected to the first end of the first capacitor, a second end of the second switch is grounded, and the main control chip of the electronic device outputs a driving signal to the third end of the second switch.

[0008] The above-mentioned over-temperature automatic power-off circuit further includes a second resistor, a first end of the second resistor is connected to the first voltage, and a second end of the second resistor is connected to the first end of the first switch.

[0009] The above-mentioned over-temperature automatic power-off circuit further includes a third resistor, a first end of the third resistor is connected to the first end of the first capacitor, and a second end of the third resistor is connected to the first end of the second switch.

[0010] In a specific embodiment, the first thermistor is an NTC resistor.

[0011] In a specific embodiment, the first switch and the second switch are MOSFETs.

[0012] Furthermore, the adapter is connected to the electronic device via the data cable.

[0013] In a specific embodiment, the first thermistor is disposed near a charging port of the electronic device.

[0014] In a specific embodiment, the electronic device is a mobile phone or a mobile power source.

[0015] The utility model also provides an electronic device, comprising the above-mentioned over-temperature automatic power-off circuit, and an adapter is connected to the electronic device through the data line.

[0016] Beneficial effect: the utility model provides an over-temperature automatic power-off circuit. When the temperature of the charging port is too high, it will actively generate a large current, trigger the adapter to generate over-current protection from the outside, thereby stopping power output, ensuring that no heat loss will be generated, and playing a protective role.

[0017] In order to make the above features and advantages of the utility model more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a schematic diagram of an over-temperature automatic power-off circuit applied to adapter charging.

[0019] Figure 2 The utility model is a circuit diagram of an over-temperature automatic power-off circuit. DETAILED DESCRIPTION

[0020] In order to make the purpose and technical solution of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings of the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Figure 1 This is a schematic diagram of an over-temperature automatic power-off circuit of the utility model applied to adapter charging. Figure 1 As shown, the adapter 2 is connected to the electronic device 4 via the data line 3 to charge it, and the over-temperature automatic power-off circuit 1 connects the electronic device 4 and the data line 3.

[0022] More specifically, the adapter 2 includes a first main control chip 21, an overcurrent protection module 22 and a charging module 23. The first main control chip 21 is connected to the overcurrent protection module 22 and the charging module 23, and the overcurrent protection module 22 and the charging module 23 are connected to the data line 3. The first main control chip 21 controls the charging module 23 to output power to the electronic device 4 through the data line 3; the overcurrent protection module 22 monitors the charging current on the data line 3 to determine whether to trigger the overcurrent protection.

[0023] More specifically, the electronic device 4 includes a charging port 41, a power management chip 42, a second main control chip 43 and a battery 44. The charging module 23 is connected to the charging port 41 via the data line 3 to charge the electronic device 4; the second main control chip 43 is connected to the power management chip 42, and the power management chip 42 is connected to the battery 44.

[0024] More specifically, the over-temperature automatic power-off circuit 1 is connected to the charging port 41, detects the temperature T of the charging port 41 and converts the resistance value R related to the temperature into T Output to the second main control chip 43; the second main control chip 43 outputs the driving signal P1 and the driving signal P2 to the over-temperature automatic power-off circuit 1; the over-temperature automatic power-off circuit 1 will generate a momentary large current I C1 Output to adapter 2 via data line 3.

[0025] Optionally, the electronic device 4 is a mobile phone or a mobile power supply.

[0026] Figure 2 The utility model is a circuit diagram of an over-temperature automatic power-off circuit. The utility model comprises a thermistor R1, which detects the temperature of the charging port 41 of the electronic device 4 and outputs a resistance value R related to the temperature. T To the second main control chip 43.

[0027] Optionally, the thermistor R1 is disposed near the charging port 41 of the electronic device 4 .

[0028] In one specific embodiment, the thermistor R1 is an NTC resistor.

[0029] Furthermore, the utility model also includes an over-temperature automatic power-off circuit 1 of a resistor R2, a switch Q1, a capacitor C1, a resistor R3 and a switch Q2, wherein the first end of the resistor R2 is connected to the voltage Vcc, the second end of the resistor R2 is connected to the first end of the switch Q1, the second end of the switch Q1 is connected to the first end of the capacitor C1, the second end of the capacitor C1 is grounded, the first end of the capacitor C1 is connected to the first end of the resistor R3, the second end of the resistor R3 is connected to the first end of the switch Q2, and the second end of the switch Q2 is grounded.

[0030] Among them, the voltage Vcc plays the role of power supply.

[0031] Optionally, the switch Q1 and the switch Q2 are MOSFETs.

[0032] Next, continue to combine Figure 1 and Figure 2 The working principle of the utility model is introduced as follows: Under normal circumstances, when the adapter 2 charges the electronic device 4 via the data line 3, the power management chip 42 charges the battery 44 at the current maximum power.

[0033] When the charging port 41 is short-circuited due to water ingress, dirt, foreign matter, etc., causing the temperature of the charging port 41 to rise abnormally, 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 second main control chip 43, the second main control chip 43 determines the resistance value R T If the voltage Vcc is greater than the threshold, the drive signal P1 will be output to turn on the switch Q1. The voltage Vcc charges the capacitor C1 through the resistor R2 and the switch Q1, generating a momentary large current I C1 The power is output to the adapter 2 through the data line 3, triggering the overcurrent protection module 22 of the adapter 2, which outputs a signal to the first main control chip 21. The first main control chip 21 disconnects the charging path of the charging module 23 and stops the power output to the electronic device 4 to avoid damage to the device due to abnormal high temperature, thereby playing a protective role.

[0034] When the abnormality is resolved, 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 second main control chip 43, the second main control chip 43 determines the resistance value R T After it drops below the threshold, the output drive signal P2 turns on the switch Q2, and discharges the capacitor C1 through the resistor R3 and the switch Q2, ensuring that the charge of the capacitor C1 is zero when the next abnormal situation occurs, thereby generating a momentary large current.

[0035] In a specific embodiment, an over-temperature automatic power-off circuit 1 of the utility model can be arranged in an electronic device 4 .

[0036] Although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims

1. An over-temperature automatic power-off 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 first capacitor, the first end of the first switch is connected to a first voltage, the second end of the first switch is connected to the first end of the first capacitor, the second end of the first capacitor outputs current to the adapter, and the main control chip of the electronic device outputs a driving signal to the third end of the first switch.

2. An over-temperature automatic power-off circuit as claimed in claim 1, characterized in that: It also includes a second switch, a first end of the second switch is connected to the first end of the first capacitor, a second end of the second switch is grounded, and the main control chip of the electronic device outputs a driving signal to the third end of the second switch.

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

4. An over-temperature automatic power-off circuit as claimed in claim 3, characterized in that: A third resistor is also included, wherein a first end of the third resistor is connected to a first end of the first capacitor, and a second end of the third resistor is connected to a first end of the second switch.

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

6. An over-temperature automatic power-off circuit as claimed in claim 2, characterized in that: The first switch and the second switch are MOSFETs.

7. An over-temperature automatic power-off circuit as claimed in claim 1, characterized in that: The adapter is connected to the electronic device via a data line.

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

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

10. An electronic device, characterized in that: It comprises an over-temperature automatic power-off circuit as described in any one of claims 1 to 9, and the adapter is connected to the electronic device through the data line.

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