Charging switching circuit and PTC photographic equipment

Abstract

The utility model discloses a charging switching circuit and a PTC camera device, and relates to the technical field of PTC camera charging, and the charging switching circuit comprises a charging interface which is used for accessing an external charging device; the data transmission circuit is used for carrying out data exchange with external charging equipment; the fast charging protocol circuit is used for controlling external charging equipment to supply power at a fast charging voltage or a slow charging voltage when the external charging equipment is connected to the charging interface; the switching circuit is used for selectively connecting the first selection end or the second selection end; and the main controller is used for sending a switching control signal to the switching circuit when the slow charging voltage is detected to supply power, so as to control the switching circuit to be connected with the data transmission circuit. Thus, the external charging device is controlled to supply power to the PTC photographic device at the fast charging voltage or the slow charging voltage, and when it is recognized that the power is supplied at the slow charging voltage, the switching circuit is controlled to be connected with the data transmission circuit, so that the reliability and compatibility of the charging system are improved.

Description

Technical Field

[0001] This utility model relates to the field of PTC photography equipment charging technology, and in particular to a charging switching circuit and a PTC photography equipment. Background Technology

[0002] In the context of the rapid development of electronic information technology, electronic products are trending towards portability, aesthetics, and high integration, leading to a reduction in product size and the number of interfaces. Therefore, to meet usage demands, some product interfaces must perform multiple functions. For example, a PTC camera might only have one USB port. However, many electronic products, including PTC cameras, require their USB ports to not only handle data transmission but also support fast charging. In the circuit design of USB interfaces, data signals and fast charging protocol signals share the same set of signal pins. To address the challenge of sharing these signal pins, a switch for switching between data transmission and fast charging functions is typically configured on the USB interface. However, when switching between data transmission and fast charging functions on the device's USB interface, situations may arise where data transmission or fast charging cannot be recognized, significantly reducing system reliability and compatibility. Therefore, in this technical field, how to achieve efficient switching between USB data and fast charging functions and improve the reliability of the USB switching circuit has become an urgent technical challenge. Utility Model Content

[0003] The main objective of this invention is to propose a charging switching circuit and a PTC imaging device, aiming to solve the problem that some charging interfaces cannot recognize data transmission or fast charging, which greatly reduces the reliability and compatibility of the system.

[0004] To achieve the above objectives, this utility model proposes a charging switching circuit, applied to a PTC camera device, the circuit comprising:

[0005] Charging port, used to connect external charging devices;

[0006] A data transmission circuit is used for data exchange with the external charging device;

[0007] The fast charging protocol circuit is used to send a fast charging identification signal to the external charging device when the external charging device is connected to the charging interface, and control the external charging device to supply power with fast charging voltage or slow charging voltage.

[0008] A switching circuit, wherein the first selection terminal of the switching circuit is electrically connected to the fast charging protocol circuit, the second selection terminal of the switching circuit is electrically connected to the data transmission circuit, and the input terminal of the switching circuit is electrically connected to the charging interface, wherein the switching circuit is defaulted to be electrically connected to the fast charging protocol circuit;

[0009] The main controller has its detection terminal electrically connected to the power supply terminal of the charging interface, and its control terminal electrically connected to the controlled terminal of the switching circuit. When an external charging device detects a slow charging voltage supplying power, the main controller sends a switching control signal to the switching circuit to control the switching circuit to connect to the data transmission circuit.

[0010] In one embodiment, the charging switching circuit further includes

[0011] The detection circuit has a first terminal electrically connected to the power supply terminal of the charging interface and a second terminal electrically connected to the detection terminal of the main controller, and is used to detect the power supply voltage of the power supply terminal of the charging interface.

[0012] In one embodiment, the detection circuit includes:

[0013] The first resistor and the second resistor, wherein...

[0014] The first end of the first resistor is electrically connected to the power supply end of the charging interface, the second end of the first resistor is electrically connected to the detection end of the main controller and the first end of the second resistor, and the second end of the second resistor is grounded.

[0015] In one embodiment, the charging switching circuit includes:

[0016] A switching circuit, electrically connected to the main controller, is used to send a start control signal to control the main controller to send a first prompt control signal when it detects that the power supply voltage is disconnected;

[0017] A first prompting circuit, electrically connected to the main controller, is used to prompt the user that the power supply voltage is disconnected when a first prompting control signal is received.

[0018] In one embodiment, the charging switching circuit further includes:

[0019] A timing circuit, electrically connected to the main controller, is used to send a timing start signal when the fast charging mode is in operation, so as to control the timing circuit to send a second prompt control signal after the timing is completed.

[0020] The second prompt circuit, which is electrically connected to the main controller, is used to prompt the user that the charging is fully charged when a second prompt control signal is received.

[0021] In one embodiment, the charging switching circuit further includes:

[0022] A temperature detection circuit, electrically connected to the main controller, is used to send a temperature detection signal to the main controller so that when the temperature reaches a threshold, the main controller issues a switching control signal to control the switching circuit to switch its connection to the data transmission circuit.

[0023] In one embodiment, the charging switching circuit further includes:

[0024] A temperature detection circuit, electrically connected to the main controller, is used to send a temperature detection signal to the main controller. When the temperature reaches a threshold, the main controller issues a switching control signal to control the switching circuit to switch its connection to the data transmission circuit and enter the data transmission mode.

[0025] In one embodiment, the temperature detection circuit is configured as a thermistor.

[0026] This invention also proposes a PTC imaging device, including the charging switching circuit described above.

[0027] This utility model's technical solution employs a charging switching circuit applied to a PTC camera device. The circuit includes: a charging interface for connecting to an external charging device; a data transmission circuit for exchanging data with the external charging device; a fast charging protocol circuit for sending a fast charging identification signal to the external charging device when it is connected to the charging interface, controlling the external charging device to supply power using either a fast charging voltage or a slow charging voltage; a switching circuit, with its first selection terminal electrically connected to the fast charging protocol circuit, its second selection terminal electrically connected to the data transmission circuit, and its input terminal electrically connected to the charging interface; and a main controller, with its detection terminal electrically connected to the power supply terminal of the charging interface and its control terminal electrically connected to the controlled terminal of the switching circuit, for sending a switching control signal to the switching circuit when a slow charging voltage is detected, thereby controlling the switching circuit to connect to the data transmission circuit. Thus, the charging switching circuit sends a fast charging identification signal to control the external charging device to supply power to the PTC camera device with either a fast charging voltage or a slow charging voltage. When the main controller identifies that the external charging device is supplying power with a slow charging voltage, it sends a switching control signal to the switching circuit to control the external charging device to exchange data with the PTC camera device after the switching circuit is connected to the data transmission circuit, thereby improving the reliability and compatibility of the charging system. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 A system structure block diagram of an embodiment of the charging switching circuit provided by this utility model.

[0030] Explanation of icon numbers:

[0031] 1-Charging interface; 2-Data transmission circuit; 3-Fast charging protocol circuit; 4-Switching circuit; 5-Main controller; 6-Switch circuit; 7-First indication circuit; 8-Timing circuit; 9-Second indication component; 10-Temperature detection circuit; 11-Detection circuit.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0034] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] This utility model proposes a charging switching circuit for use in PTC camera equipment, the circuit comprising:

[0037] Charging port 1 is used to connect an external charging device;

[0038] Data transmission circuit 2 is used for data exchange with the external charging device;

[0039] The fast charging protocol circuit 3 is used to send a fast charging identification signal to the external charging device when the external charging device is connected to the charging interface 1, and control the external charging device to supply power with fast charging voltage or slow charging voltage.

[0040] The switching circuit 4 has a first selection terminal electrically connected to the fast charging protocol circuit 3, a second selection terminal electrically connected to the data transmission circuit 2, and an input terminal electrically connected to the charging interface 1. The switching circuit 4 is defaulted to be electrically connected to the fast charging protocol circuit 3.

[0041] The main controller 5 has its detection terminal electrically connected to the power supply terminal of the charging interface 1, and its control terminal electrically connected to the controlled terminal of the switching circuit 4. When a slow charging voltage is detected, the main controller 5 sends a switching control signal to the switching circuit 4 to control the switching circuit 4 to connect to the data transmission circuit 2.

[0042] In this embodiment, the charging interface 1 can be configured as a USB TYPE-A interface, USB TYPE-C interface, or Lightning interface, etc. The external charging device can be configured as an adapter or computer host with an internal Ingenic IP2218 fast charging chip, etc. The data transmission circuit 2 can be configured as a data transmission chip of type FE1.1s or GL850G, etc. The fast charging protocol circuit 3 can be configured as a fast charging protocol chip of type Huinengtai HUSB238, Qinheng CH224, or XSP04, etc. The switching circuit 4 can be implemented as an analog switch IC of type NLAS7222B or NLAS7222C, etc. The main controller 5 can be implemented using, for example, MCU (Microcontroller Unit), DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), or SOC (System On Chip) with 5V voltage input such as ESP32-C3 chip, etc.

[0043] Specifically, since the switching circuit 4 is defaulted to be electrically connected to the fast charging protocol circuit 3, when the charging interface 1 is connected to an external charging device, the fast charging protocol circuit 3 sends a fast charging identification signal to the external charging device. The USB fast charging protocol chip and the external charging device perform fast charging protocol adaptation. If the fast charging protocol adaptation between the two is successful, the external charging device outputs a fast charging voltage through the power supply terminal of the charging interface 1. If the fast charging protocol adaptation between the two is unsuccessful, the external charging device outputs a slow charging voltage (i.e., the default USB voltage) through the power supply terminal of the charging interface 1. When the detection terminal of the main controller 5 detects that the power supply voltage is a slow charging voltage, the main controller 5 outputs a switching control signal to the switching circuit 4 to control the switching circuit 4 to connect to the data transmission circuit 2, and then the data transmission circuit 2 and the external charging device exchange data.

[0044] Furthermore, the charging switching circuit also includes

[0045] The detection circuit 11 has a first end electrically connected to the power supply terminal of the charging interface 1 and a second end electrically connected to the detection terminal of the main controller 5, and is used to detect the power supply voltage of the power supply terminal of the charging interface 1.

[0046] In this embodiment, the detection circuit 11 can sample the power supply voltage of the power supply terminal of the charging interface 1 through a resistor voltage divider sampling circuit or a voltage detection chip of type FS7050 / FS7033, so as to output the sampled voltage signal to the main controller 5.

[0047] Furthermore, the detection circuit 11 includes:

[0048] The first resistor R1 and the second resistor R2, wherein...

[0049] The first end of the first resistor R1 is electrically connected to the power supply end of the charging interface 1, the second end of the first resistor R1 is electrically connected to the detection end of the main controller 5 and the first end of the second resistor R2, and the second end of the second resistor R2 is grounded.

[0050] In this embodiment, the first resistor R1 and the second resistor R2 form a resistor voltage divider sampling circuit. Using the principle of resistor voltage divider, the power supply voltage at the power supply terminal of the charging interface 1 is sampled. When the power supply voltage is the slow charging voltage, and the sampled voltage signal is lower than the first threshold voltage, the main controller 5 recognizes that the power supply voltage is the slow charging voltage and outputs a switching control signal to the switching circuit 4. This connects the switching circuit 4 to the data transmission circuit 2, enabling data exchange between the PTC camera and the external charging device.

[0051] In one embodiment, the charging switching circuit includes:

[0052] Switching circuit 6, which is electrically connected to the main controller 5, is used to send a start control signal to control the main controller 5 to send a first prompt control signal when it detects that the power supply voltage is disconnected;

[0053] The first prompting circuit 7 is electrically connected to the main controller 5 and is used to prompt the user that the power supply voltage is disconnected when a first prompting control signal is received.

[0054] In this embodiment, the switching circuit 6 can be composed of a mechanical switch or an electronic switch. For example, when using a mechanical switch, a tactile switch, a push-button switch, a toggle switch, a key switch, or a micro switch can be used to trigger and send a start control signal. The first prompt circuit can provide prompts through multiple LED lights, a buzzer, a voice prompt circuit, a vibration circuit, etc. Its function is that when the main controller 5 detects that the power supply voltage is disconnected (when the sampled voltage signal is lower than the second threshold voltage), and sends the first prompt control signal, the LED indicator may flash or remain lit, and the sound alarm may sound to remind the user to pay attention to the abnormal power supply status. This is to prevent the PTC camera equipment, which needs to work for a long time in indoor scenes, from being powered and transmitting data using a slow charging voltage due to operator error by accidentally disconnecting the external device from the charging interface 1 of the PTC camera equipment, resulting in interrupted data transmission or insufficient battery power after prolonged use, thus preventing the equipment from working normally.

[0055] In one embodiment, the charging switching circuit further includes:

[0056] The timing circuit 8 is electrically connected to the main controller 5. When the fast charging mode is in operation, the main controller 5 sends a timing start signal to control the timing circuit 8 to send a second prompt control signal after the timing is completed.

[0057] The second prompt circuit 9 is electrically connected to the main controller 5 and is used to prompt the user that the charging is fully charged when a second prompt control signal is received.

[0058] In this embodiment, the timing circuit 8 can be implemented using a 555 timer circuit 8 or a timer module built into the main controller 5. The timing circuit 8 allows the user to set the charging completion time according to actual needs, prompting the user to turn off the charging power in time to avoid overcharging and ensure the battery life of the PTC camera device. Furthermore, the second prompt circuit 9 can provide prompts through various means such as multiple LED lights, buzzers, voice prompt circuits, and vibration circuits. For example, when the timing circuit 8 completes the set time, the LED light will display a specific flashing pattern, or the buzzer will emit a continuous prompt tone. Simultaneously, if the device is equipped with a voice prompt circuit, it will play a preset voice message to inform the user that charging is complete. The vibration circuit can provide silent vibration prompts in specific environments, such as a quiet library or conference room. This design not only improves the user experience but also ensures the safety of the device and the long-term reliability of the battery.

[0059] In one embodiment, the charging switching circuit further includes:

[0060] Temperature detection circuit 10 is electrically connected to the main controller 5 and is used to send a temperature detection signal to the main controller 5 so that when the temperature reaches a threshold, the main controller 5 issues a switching control signal to control the switching circuit 4 to switch to the data transmission circuit 2.

[0061] In this embodiment, the temperature detection circuit 10 can be implemented using a thermistor or a thermocouple. Thermistors are low-cost and have a fast response, making them suitable for real-time battery temperature monitoring. Thermocouples, on the other hand, are suitable for more stringent temperature monitoring requirements due to their high accuracy and wide temperature range. Since PTC camera devices are sometimes used outdoors, if users use an adapter to power the PTC camera device with a fast-charging voltage while using an outdoor power source, the internal battery of the PTC camera device often overheats and is damaged. Therefore, the introduction of the temperature detection circuit 10 can effectively prevent damage to the PTC camera device due to excessive temperature. In practical applications, the temperature detection circuit 10 monitors the battery temperature in real time, sends a temperature detection signal to the main controller 5, and compares it with a preset temperature threshold. Once the temperature exceeds the safe threshold range, the main controller 5 immediately issues a switching control signal to control the switching circuit 4 to switch its connection to the data transmission circuit 2, controlling the external charging device to power it with a slow-charging voltage. This allows the PTC camera device to operate stably within a safe temperature range, avoiding battery damage or performance degradation due to overheating.

[0062] Furthermore, the temperature detection circuit 10 is configured as a thermistor.

[0063] This utility model also proposes a PTC imaging device, which includes the above-mentioned charging switching circuit. The specific structure of the charging switching circuit is as described in the above embodiments. Since this PTC imaging device 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.

[0064] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A charge switching circuit applied to a PTC camera device, characterized by, The circuit includes: Charging port, used to connect external charging devices; A data transmission circuit is used for data exchange with the external charging device; The fast charging protocol circuit is used to send a fast charging identification signal to the external charging device when the external charging device is connected to the charging interface, and control the external charging device to supply power with fast charging voltage or slow charging voltage. A switching circuit, wherein the first selection terminal of the switching circuit is electrically connected to the fast charging protocol circuit, the second selection terminal of the switching circuit is electrically connected to the data transmission circuit, and the input terminal of the switching circuit is electrically connected to the charging interface, wherein the switching circuit is defaulted to be electrically connected to the fast charging protocol circuit; The main controller has its detection terminal electrically connected to the power supply terminal of the charging interface, and its control terminal electrically connected to the controlled terminal of the switching circuit. When a slow charging voltage is detected, the main controller sends a switching control signal to the switching circuit to control the switching circuit to connect to the data transmission circuit.

2. The charge switching circuit of claim 1, wherein, The charging switching circuit also includes: The detection circuit has a first terminal electrically connected to the power supply terminal of the charging interface and a second terminal electrically connected to the detection terminal of the main controller, and is used to detect the power supply voltage of the power supply terminal of the charging interface.

3. The charge switching circuit of claim 2, wherein, The detection circuit includes: The first resistor and the second resistor, wherein... The first end of the first resistor is electrically connected to the power supply end of the charging interface, the second end of the first resistor is electrically connected to the detection end of the main controller and the first end of the second resistor, and the second end of the second resistor is grounded.

4. The charge switching circuit of claim 2, wherein, The charging switching circuit includes: A switching circuit, electrically connected to the main controller, is used to send a start control signal to control the main controller to send a first prompt control signal when it detects that the power supply voltage is disconnected; A first prompting circuit, electrically connected to the main controller, is used to prompt the user that the power supply voltage is disconnected when a first prompting control signal is received.

5. The charge switching circuit of claim 1, wherein, The charging switching circuit also includes: A timing circuit, electrically connected to the main controller, is used to send a timing start signal when the fast charging mode is in operation, so as to control the timing circuit to send a second prompt control signal after the timing is completed. The second prompt circuit, which is electrically connected to the main controller, is used to prompt the user that the charging is fully charged when a second prompt control signal is received.

6. The charge switching circuit of claim 1, wherein, The charging switching circuit also includes: A temperature detection circuit, electrically connected to the main controller, is used to send a temperature detection signal to the main controller so that when the temperature reaches a threshold, the main controller issues a switching control signal to control the switching circuit to switch its connection to the data transmission circuit.

7. The charge switching circuit of claim 6, wherein, The temperature detection circuit is set as a thermistor.

8. A PTC photographic apparatus characterized by comprising: Includes the charging switching circuit as described in any one of claims 1-7.

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