A low-power temperature acquisition circuit and a charge / discharge gun

Abstract

This utility model patent discloses a low-power temperature acquisition circuit, comprising: a main microcontroller and a first auxiliary microcontroller. The first auxiliary microcontroller is connected to the main microcontroller via a bidirectional data line for data communication. The first auxiliary microcontroller includes a first power supply pin, a first ground pin, a first pin, and at least one first cascade pin. The main microcontroller is connected to the power supply pin via the bidirectional data line to supply power to the first auxiliary microcontroller. The first ground pin is grounded. The first pin is connected to a first thermistor. The first cascade pin is used to connect to a thermistor on a cascaded device of the first auxiliary microcontroller, or to connect to a microcontroller on a cascaded device of the first auxiliary microcontroller. This utility model also discloses a charge / discharge gun using the above-described low-power acquisition circuit to achieve multi-channel cascading with a single read, reducing communication transmission and lowering costs.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicle charging and discharging technology, specifically a low-power temperature acquisition circuit and a charging and discharging gun. Background Technology

[0002] A charge / discharge gun (combined charge / discharge gun) is a device that integrates charging and discharging functions. Current technology for charge / discharge guns has largely achieved integrated setting of charging and discharging modes and rapid switching; however, the following problems still exist in application: 1. When existing charging and discharging guns collect and detect temperature, a single temperature sensor chip can only read one temperature. When multiple temperature readings are required, they must be used in parallel, resulting in high power consumption, reduced reliability, and increased cost.

[0003] 2. Charging and discharging guns require identification during use. This means identifying whether an adapter is connected to the plug, whether it's fast or slow charging, whether a discharge power strip is connected, and whether it's in discharge mode. This ensures safe charging and discharging. Existing charging and discharging guns use complex circuits or chips for identification, which is costly.

[0004] 3. When charging or discharging, the internal temperature of the charging gun head is too high, which poses a safety hazard. Existing charging guns usually only have temperature detection at the plug end, but no temperature detection is set at the adapter and discharge connector, which poses a safety hazard. Utility Model Content

[0005] The purpose of this invention is to provide a low-power temperature acquisition circuit and a charging / discharging gun to achieve multi-channel cascading with a single reading, reduce communication transmission, and lower costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This utility model patent discloses a low-power temperature acquisition circuit, comprising: a main microcontroller and a first auxiliary microcontroller. The first auxiliary microcontroller is connected to the main microcontroller via a bidirectional data line for data communication. The first auxiliary microcontroller includes a first power supply pin, a first ground pin, a first pin, and at least one first cascade pin. The main microcontroller is connected to the power supply pin via the bidirectional data line to supply power to the first auxiliary microcontroller. The first ground pin is grounded. The first pin is connected to a first thermistor. The first cascade pin is used to connect to a thermistor on a cascaded device of the first auxiliary microcontroller, or to connect to a microcontroller on a cascaded device of the first auxiliary microcontroller.

[0007] Preferably, the first cascade pin has at least two pins, which are respectively used to connect to two cascaded devices connected to the first auxiliary microcontroller.

[0008] Preferably, the two cascaded devices are respectively equipped with a second auxiliary microcontroller and a third auxiliary microcontroller. The second auxiliary microcontroller includes a second power supply pin, a second ground pin, and a second pin. The second power supply pin is connected to a bidirectional data line and is powered by the main microcontroller; the second ground pin is grounded; and the second pin is connected to a second thermistor.

[0009] The third auxiliary microcontroller includes a third power supply pin, a third ground pin, and a third pin. The third power supply pin is connected to a bidirectional data line and is powered by the main microcontroller; the third ground pin is grounded; and the third pin is connected to a third thermistor.

[0010] Furthermore, the third auxiliary microcontroller also includes a second cascading pin; the second cascading pin is used to connect to a thermistor on the cascading device of the third auxiliary microcontroller, or to connect to a microcontroller on the cascading device of the third auxiliary microcontroller.

[0011] In this configuration, one end of the first thermistor is connected to VDD, and the other end is grounded. A first resistor and a first capacitor are connected in parallel across the two ends of the first thermistor. One end of the second thermistor is connected to VDD, and the other end is grounded. A second resistor and a second capacitor are connected in parallel across the two ends of the second thermistor. One end of the third thermistor is connected to VDD, and the other end is grounded. A third resistor and a third capacitor are connected in parallel across the two ends of the third thermistor.

[0012] Preferably, the first auxiliary microcontroller, the second auxiliary microcontroller, and the third auxiliary microcontroller have built-in EEPROM.

[0013] This utility model also discloses a charging and discharging gun, which includes a gun head body and a plug end connected to the gun head body. The characteristic is that: the above-mentioned low-power temperature acquisition circuit is used, a main microcontroller is installed on the gun head body, and a first auxiliary microcontroller and a first thermistor are installed on the plug end. The first thermistor is used to detect the temperature of the plug end.

[0014] In some embodiments, the first cascade pin is provided with at least two pins, which are respectively used to connect to two cascaded devices connected to the first auxiliary microcontroller. The two cascaded devices are an adapter and a discharge connector.

[0015] The adapter is equipped with a second thermistor for detecting the temperature of the adapter, and the discharge connector is equipped with a third thermistor for detecting the temperature of the discharge connector. The two first cascade pins are respectively connected to the second thermistor and the third thermistor.

[0016] In other embodiments, the first cascade pins are provided with at least two pins, each for connecting to one of two cascaded devices connected to the first auxiliary microcontroller. The two cascaded devices are an adapter and a discharge connector. A second auxiliary microcontroller is housed within the adapter and connected to a second thermistor for detecting the adapter's temperature. A third auxiliary microcontroller is housed within the discharge connector and connected to a third thermistor for detecting the discharge connector's temperature. The two first cascade pins are respectively connected to the second and third auxiliary microcontrollers.

[0017] After adopting the above technical solution, the present invention has the following effects: 1. The low-power temperature acquisition circuit of this utility model is connected to the main microcontroller through a first auxiliary microcontroller. The first auxiliary microcontroller acquires the temperature of the device itself through the first pin and acquires the temperature of the cascaded device through at least one first cascade pin. It can support multi-channel temperature detection. It is connected to the main microcontroller through the same bidirectional data line, realizing one-time reading of multiple cascaded channels, reducing communication transmission, low power consumption, and high reliability.

[0018] 2. When the charging and discharging gun of this utility model is in use, it collects temperature information through different pins of the first auxiliary microcontroller, and can identify the connection status of different cascaded devices (adapters or discharge plugs). While collecting and detecting the temperature, it also has an identification function. When the identification is successful, it enters the corresponding charging or discharging, which can realize intelligent service and avoid safety hazards caused by misoperation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the charging and discharging gun.

[0020] Figure 2 This is a schematic diagram showing the connection between the charging / discharging gun and the adapter.

[0021] Figure 3 This is a schematic diagram showing the connection between the charging / discharging gun and the discharge connector.

[0022] Figure 4 This is a schematic diagram of the connection between the charging / discharging gun and the discharge connector (the next-level discharge connector is connected to the discharge connector).

[0023] Figure 5 This is a circuit diagram of Embodiment 2.

[0024] Figure 6a This is a circuit diagram of Embodiment 3.

[0025] Figure 6b This is a connection diagram for U2.

[0026] Figure 6c This is a connection diagram for U3.

[0027] Main component symbols: 1: Gun head body, 2: Plug end, 3: Adapter, 4: Discharge connector, 5: Load, 6: Next stage discharge connector. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] Example 1 This utility model discloses a low-power temperature acquisition circuit, including a main microcontroller U0 and a first auxiliary microcontroller U1. The first auxiliary microcontroller U1 is connected to the main microcontroller U0 for data communication via a bidirectional data line.

[0030] The first auxiliary microcontroller U1 includes a first power supply pin (VDD), a first ground pin (VSS), a first pin (U1-pin 6), and at least one first cascade pin (U1-pin 4). The main microcontroller U0 is connected to the power supply pin via a bidirectional data line to supply power to the first auxiliary microcontroller U1. The first ground pin is grounded. The first pin is connected to a first thermistor NTC1. One end of the first thermistor NTC1 is connected to VDD, and the other end is grounded. A first resistor R1 and a first capacitor C1 are connected in parallel across the first thermistor NTC1 to protect it. The first auxiliary microcontroller U1 has a built-in EEPROM (Electrically Erasable Programmable Read-Only Memory), which is a type of memory chip that does not lose data after power failure. The EEPROM can be erased and reprogrammed on a computer or dedicated equipment.

[0031] like Figure 5 As shown, in one embodiment, the first cascade pin has two pins (pin 4 and pin 7), which are respectively connected to the second thermistor NTC2 and the third thermistor NTC3 on the cascade device of the first auxiliary microcontroller.

[0032] like Figure 6a As shown, in another embodiment, the two first cascade pins (pin 4 and pin 7) are respectively connected to the second auxiliary microcontroller U2 and the third auxiliary microcontroller U3 on the cascaded device with the first auxiliary microcontroller.

[0033] like Figure 6bAs shown, the second auxiliary microcontroller U2 includes a second power supply pin (VDD), a second ground pin (VSS), and a second pin (U2-pin 6). The second power supply pin is connected to a bidirectional data line and is powered by the main microcontroller. The second ground pin is grounded. The second pin is connected to a second thermistor NTC2. One end of the second thermistor NTC2 is connected to VDD, and the other end is grounded. A second resistor R2 and a second capacitor C2 are connected in parallel across the two ends of the second thermistor NTC2 to protect it.

[0034] like Figure 6c As shown, the third auxiliary microcontroller U3 includes a third power supply pin (VDD), a third ground pin (VSS), and a third pin (U3-pin 6). The third power supply pin is connected to the bidirectional data line and is powered by the main microcontroller. The third ground pin is grounded. The third pin is connected to the third thermistor NTC3. One end of the third thermistor NTC3 is connected to VDD, and the other end is grounded. A third resistor R3 and a third capacitor C3 are connected in parallel across the third thermistor NTC3 to protect it.

[0035] Furthermore, the third auxiliary microcontroller U3 also includes a second cascade pin (U3-pin 4). The second cascade pin is used to connect the thermistor NTC4 on the cascade device of the third auxiliary microcontroller U3, or to connect the microcontroller U4 on the cascade device of the third auxiliary microcontroller.

[0036] The low-power temperature acquisition circuit in this embodiment powers the auxiliary microcontroller via the main microcontroller, reducing power consumption, cost, and improving reliability. It can be cascaded in multiple channels, with each channel supporting up to three temperature detections. The temperature sampling time is short, allowing for rapid response. Sampled data can be transmitted to the main microcontroller in real time without requiring the main microcontroller to send requests, thus improving data real-time performance.

[0037] Example 2 like Figure 1 As shown, this embodiment discloses a charging and discharging gun, including a gun head body 1 and a plug terminal 2 connected to the gun head body. The gun head body 1 is connected to a vehicle. The plug terminal 2 is a three-prong plug with three pins: N, L, and PE. Figure 2 As shown, when the charging gun is charging, connector 2 can be plugged into the AC power supply to charge the car; or connector 2 can be connected to adapter 5 (16A to 10A converter), and adapter 5 can be plugged into the AC power supply to charge the car. Figure 3 As shown, when the charging gun discharges, plug 2 is inserted into the discharge connector 6 to discharge. One or more loads 15 can be connected to the discharge connector 6; load 15 can be electrical products (such as lights, ovens, fans, electronic smart devices, etc.). Figure 4 As shown, discharge connector 6 can also be cascaded with another discharge connector.

[0038] The charging / discharging gun in this embodiment uses the low-power temperature acquisition circuit of Embodiment 1. The main microcontroller U0 is housed within the gun head body 1, and a first auxiliary microcontroller U1 and a first thermistor NTC1 are mounted on the plug end 2. The first thermistor NTC1 is used to detect the temperature of the plug end 2. The first auxiliary microcontroller can also be used to input an identification code and other user-required information (such as alarm thresholds). The first auxiliary microcontroller has two first cascaded pins, pin 7 and pin 4.

[0039] like Figure 5 As shown, in this embodiment, pin 7 is connected to the third thermistor NTC3 on the discharge connector 6. Pin 4 is connected to the second thermistor NTC2 on the adapter 5.

[0040] When entering the 10A charging state, connect plug terminal 2 to adapter 5 via pin 4. Adapter 5 is the cascaded device in this case, and it contains a second thermistor NTC2 for detecting the temperature inside adapter 5. When entering the discharging state, connect plug terminal 2 to discharge connector 6 via pin 7. Discharge connector 6 is the cascaded device in this case, and it contains a third thermistor NTC3 for detecting the temperature of the power strip connector.

[0041] Its working principle is as follows: 1. In charging gun mode, high-current charging can be initiated by reading U1 to identify the plug's identity and temperature information. Simultaneously, after identifying the plug's identity, identifying NTC2 determines whether to switch to low-current charging. If NTC2 is not detected, U1 transmits the identification code and the temperature collected by NTC1 to U0 for real-time logic control. If NTC2 is detected, U1 transmits the identification code, the temperature collected by NTC1, and the temperature collected by NTC2 to U0.

[0042] 2. In discharge gun mode, the system can read the identification information and temperature information from U1 to wait for discharge. Simultaneously, after identifying the plug terminal, the system can determine whether to enter discharge mode by identifying NTC3. If NTC3 is not identified, U1 transmits the identification code and the temperature collected by NTC1 to U0 for real-time logic control. If NTC3 is identified, U1 transmits the identification code, the temperature collected by NTC1, and the temperature collected by NTC3 to U0.

[0043] Example 3 This embodiment discloses a charging and discharging gun, which differs from Embodiment 2 in that: in this embodiment, a cascaded microcontroller scheme is adopted, and the first auxiliary microcontroller is provided with two first cascade pins, namely pin 7 and pin 4. For example... Figure 6aAs shown, in this embodiment, pin 7 is connected to the third auxiliary microcontroller U3 on the discharge connector 6, and pin 4 is connected to the second auxiliary microcontroller U2 on the adapter 5.

[0044] like Figure 6b As shown, when entering the 10A charging state, plug end 2 is connected to adapter 5 via pin 4. The cascaded device is adapter 5, which houses a second auxiliary microcontroller U2. Pin 6 of the second auxiliary microcontroller U2 is connected to a second thermistor NTC2 used to detect the temperature inside adapter 5. Figure 6c As shown, when it is necessary to enter the discharge state, plug end 2 is connected to discharge connector 6 through pin 7. At this time, the cascaded device is discharge connector 6. Discharge connector 6 is equipped with a third auxiliary microcontroller U3. Pin 6 of the third auxiliary microcontroller U3 is connected to a third thermistor NTC3 used to detect the temperature of the power strip connector.

[0045] U1, U2, and U3 are respectively implanted by the user with an identification code and a series of other information required by the user (such as alarm thresholds).

[0046] Its working principle is as follows: 1. In charging gun mode, high-current charging can be initiated by reading U1 to identify the plug's identity and temperature information. Simultaneously, after identifying the plug's identity, identifying U2 determines whether to switch to low-current charging. If U2 is not identified, U1 transmits the identification code and the temperature collected by NTC1 to U0 for real-time logic control. If U2 is identified, U1 transmits the identification code, the temperature collected by NTC1, the U2 identification code, and the temperature collected by NTC2 to U0.

[0047] 2. In discharge gun mode, the system can read the identification information and temperature information from U1 to wait for discharge. Simultaneously, after identifying the plug end, U3 can be used to determine whether to enter the discharge state. If U3 is not identified, U1 transmits the identification code and the temperature collected by NTC1 to U0 for real-time logic control. If NTC3 is identified, U1 transmits the identification code, the temperature collected by NTC1, the U3 identification code, and the NTC3 temperature to U0.

[0048] To enhance the power supply performance of U1 and U2 and reduce the communication data length, U1, U2, and U3 can directly send the AD values ​​sampled by the NTC to U0.

[0049] like Figure 6c As shown in the dashed box, pin 4 of the third auxiliary microcontroller U3 can also be cascaded to the thermistor NTC4 or the fourth auxiliary microcontroller U4 on the next-level discharge connector 6. The same logic applies to the next-level discharge connector.

[0050] The above description is only a preferred embodiment of the present utility model. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low-power temperature acquisition circuit, characterized in that, include: Main microcontroller, The first auxiliary microcontroller is connected to the main microcontroller via a bidirectional data line for data communication. The first auxiliary microcontroller includes a first power supply pin, a first ground pin, a first pin, and at least one first cascade pin. The main microcontroller is connected to the power supply pin via the bidirectional data line to supply power to the first auxiliary microcontroller. The first ground pin is grounded. The first pin is connected to a first thermistor. The first cascade pin is used to connect to a thermistor on a cascade device of the first auxiliary microcontroller, or to connect to a microcontroller on a cascade device of the first auxiliary microcontroller.

2. The low-power temperature acquisition circuit as described in claim 1, characterized in that: The first cascade pin has at least two pins, which are used to connect to the two cascaded devices connected to the first auxiliary microcontroller.

3. The low-power temperature acquisition circuit as described in claim 2, characterized in that: The two cascaded devices are respectively equipped with a second auxiliary microcontroller and a third auxiliary microcontroller; The second auxiliary microcontroller includes a second power supply pin, a second ground pin, and a second pin; The second power supply pin is connected to the bidirectional data line and is powered by the main microcontroller; the second ground pin is grounded; the second pin is connected to the second thermistor. The third auxiliary microcontroller includes a third power supply pin, a third grounding pin, and a third pin. The third power supply pin is connected to the bidirectional data line and is powered by the main microcontroller; the third ground pin is grounded; the third pin is connected to the third thermistor.

4. The low-power temperature acquisition circuit as described in claim 3, characterized in that: The third auxiliary microcontroller also includes a second cascade pin; The second cascading pin is used to connect to the thermistor on the cascading device of the third auxiliary microcontroller, or to connect to the microcontroller on the cascading device of the third auxiliary microcontroller.

5. The low-power temperature acquisition circuit as described in claim 1, characterized in that: One end of the first thermistor is connected to VDD and the other end is grounded. A first resistor and a first capacitor are connected in parallel across the two ends of the first thermistor.

6. The low-power temperature acquisition circuit as described in claim 3, characterized in that: One end of the second thermistor is connected to VDD and the other end is grounded. A second resistor and a second capacitor are connected in parallel across the two ends of the second thermistor. One end of the third thermistor is connected to VDD and the other end is grounded. A third resistor and a third capacitor are connected in parallel across the two ends of the third thermistor.

7. The low-power temperature acquisition circuit as described in claim 2, characterized in that: The first, second, and third auxiliary microcontrollers each have a built-in EEPROM.

8. A charging and discharging gun, the charging and discharging gun comprising a gun head body and a plug end connected to the gun head body, characterized in that: The low-power temperature acquisition circuit according to any one of claims 1 to 7 is used, wherein a main microcontroller is installed on the gun head body, and a first auxiliary microcontroller and a first thermistor are installed on the plug end, wherein the first thermistor is used to detect the temperature of the plug end.

9. The charging and discharging gun as described in claim 8, characterized in that: The first cascade pin is provided with at least two pins, which are respectively used to connect to two cascaded devices of the first auxiliary microcontroller. The two cascaded devices are: an adapter and a discharge connector. The adapter is equipped with a second thermistor for detecting the temperature of the adapter, and the discharge connector is equipped with a third thermistor for detecting the temperature of the discharge connector. The two first cascade pins are respectively connected to the second thermistor and the third thermistor.

10. The charging and discharging gun as described in claim 8, characterized in that: The first cascade pin is provided with at least two pins, which are respectively used to connect to two cascaded devices of the first auxiliary microcontroller. The two cascaded devices are: an adapter and a discharge connector. The adapter is equipped with a second auxiliary microcontroller, which is connected to a second thermistor used to detect the temperature of the adapter. The discharge connector is equipped with a third auxiliary microcontroller, which is connected to a third thermistor used to detect the temperature of the discharge connector. The two first cascade pins are respectively connected to the second auxiliary microcontroller and the third auxiliary microcontroller.

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