Detection circuit of bidirectional adapter

Abstract

The utility model relates to the field of connector charging power display, in particular to a detection circuit of a bidirectional adapter, which comprises at least more than two connectors which are connected in series through a sampling resistor and are coupled to a detection operation unit through a divider resistor. An input pin on the detection operation unit is coupled with the two ends of the sampling resistor, and the detection operation unit converts a corresponding electric signal to the display module according to the collected voltage value and current value; according to the utility model, the detection operation unit converts a signal which can be identified by the display module according to a collected electric signal, the signal is not difficult to see, and the connection mode of the utility model satisfies the requirement that a display picture of a corresponding charging value can be displayed after any connector is used as a power supply input. The problem that an existing bidirectional adapter charging line can only detect the charging numerical value in a one-way mode is solved.

Description

Technical Field

[0001] The utility model relates to the field of display of charging power of connectors, and particularly to a detection circuit for a bidirectional adapter. Background Art

[0002] Adapters, such as the mobile phone USB adapter with the patent number 201610168680.7 and the name of mobile phone USB adapter, mainly take into account the transmission of electrical signals of different types of interfaces and can also supply power to devices. For example, type A - type B, or type A - Micro USB, type A - Lightning, etc. These connectors are one of the more commonly used ones in the field of life. In fact, there are also other connectors that are more commonly used in other fields, such as DC - DC connectors, where DC refers to the DC head of the power interface type.

[0003] Under the development of the new era, the upgrade of the adapter has shifted from the core function to the extended function. This type of extended function is mainly reflected in the display screen of the charging digital display, which enables users to directly observe the current charging power and voltage and clearly know the current charging speed.

[0004] However, these types of adapters are all unidirectional power supply. In the face of charging cables with bidirectional transfer interfaces such as type - C - type - C or DC - to - DC, when the traditional detection circuit designates only one type - C interface / DC head as the charging input, the digital display will only show the effective picture. This limitation of unidirectional detection causes the defect of inconvenient use for this type of type - C - type - C and DC - to - DC bidirectional transfer interface charging cables. Summary of the Utility Model

[0005] To solve the above problems, the utility model provides a detection circuit for a bidirectional adapter. When charging using any interface, there will be a display screen of the current charging value, thus solving the problem of inconvenient use.

[0006] To achieve the above object, the technical solution adopted by the utility model is: a detection circuit for a bidirectional adapter, the detection circuit is used to display the charging value for power supply to the terminal. It is characterized in that at least two or more connectors of the detection circuit are connected in series through sampling resistors, and the two or more connectors are coupled to the detection operation unit through voltage - dividing resistors. The input pins on the detection operation unit are coupled to both ends of the sampling resistor, and the detection operation unit converts the corresponding electrical signal to the display module according to the collected voltage value and current value.

[0007] Furthermore, it also includes an LDO module. The LDO module is coupled to the detection operation unit, and the LDO module provides a stepped - down working voltage for the detection operation unit.

[0008] Further, it also includes a current-limiting resistor. The sampling resistor is connected in series to the negative electrode in the loop between the connectors. The current sequentially passes through the sampling resistor and the current-limiting resistor and then is coupled to the detection and operation unit.

[0009] Further, the model of the detection and operation unit is an MCU chip of 32D02.

[0010] Further, at least two voltage-dividing resistors are provided. The voltage-dividing resistors are coupled to each other, and at least one voltage-dividing resistor is connected to the detection and operation unit, and the other voltage-dividing resistor is grounded.

[0011] Further, the LDO module is a step-down voltage regulator of model HV6403A33R.

[0012] Further, an input capacitor and an output capacitor are respectively coupled to the two ports of the input and output of the LDO module.

[0013] Advantages of the present utility model:

[0014] The detection circuit of the present utility model has the detection effect of being applicable to charging of all connectors simultaneously. The detection and operation unit is coupled to both ends of the sampling resistor and the voltage-dividing resistor, enabling the detection and operation unit to obtain the change values of voltage and current. The detection and operation unit converts the collected electrical signals into signals that can be recognized by the display module. It is not difficult to see that the connection method of the electronic components of the present utility model satisfies that after any connector is used as the power input, a display screen capable of displaying the corresponding charging value can be shown, solving the problem that the existing two-way adapter charging cable can only detect the charging value unidirectionally. Description of the drawings

[0015] Figure 1 is the circuit diagram of the present utility model. Specific embodiments

[0016] In the specification, the reference to "an embodiment", "embodiment" or "some embodiments" means that the specific features, structures or elements described with reference to the embodiment are included in at least one embodiment of the described subject matter. Therefore, the sentences of "in one embodiment" or "in an embodiment" or "in some embodiments" in the specification do not necessarily refer to the same one or more embodiments. The specific features, structures or elements can be further combined in any embodiment in a suitable manner.

[0017] This embodiment is a circuit applied to a two-way adapter. Specifically, this circuit is a detection circuit, mainly for detecting the charging power when the two-way adapter is charging. The advantage of this circuit is that it does not cause limitations in use, and the charging power can be displayed regardless of which connector is used.

[0018] The numerical value showing the charging power includes the current charging current and the charging wattage.

[0019] The detection circuit of the bidirectional adapter includes an MCU chip U2 (model 32D02), an LED module (model HV6403A33R), and two connectors (the first connector / the second connector), as Figure 1 shown. The VCC port is connected to the 2nd pin of the first connector CON1 and is also connected to the 8th pin of chip U2 through resistor R8. The 1st pin of the first connector CON1 is connected to the 8th pin of chip U2 through resistor R11. In this solution, resistors R8 and R11 serve as voltage-dividing resistors. The voltage is divided by resistors R8 and R11 and input into the 8th pin of chip U2. Chip U2 compares the voltage values and outputs corresponding level signals to the display module. For the multiple LED chips in the display module, controlled by the level signals, after being selectively lit, they form corresponding digital patterns, and this digital pattern is the voltage display value of the current charging.

[0020] Generally, a voltage regulator LDO (model HV6403A33R) is connected to the power supply terminal of chip U2 to reduce VCC to a safe and stable range with low power consumption, protecting chip U2 from damage caused by high voltage fluctuations.

[0021] An input capacitor C2 and an output capacitor C1 are connected to the Vin and Vout pins of the voltage regulator LDO. The input capacitor C2 functions as a filter to filter out high-frequency noise into GNDA. The output capacitor C1 improves the load transient response. Since the load current changes rapidly, when the load current increases, it will cause the conduction voltage drop of the adjustment transistor in the LDO to increase, resulting in a decrease in the output voltage. After setting the output capacitor C2, it can meet the instantaneous high current demand, which helps prevent the output voltage from dropping due to load mutation and maintain the stability of the output voltage.

[0022] On the negative pole of the circuit between the connection ports, a sampling resistor RL, current-limiting resistors R7, R10, and R9 are also connected. Along the flowing direction of the charging current, the charging current enters the 16th pin of chip U2, and sequentially passes through the sampling resistor RL, current-limiting resistor R10, current-limiting resistor R9, and current-limiting resistor R7, and flows into the 10th pin of chip U2. The current-limiting resistor R10 is also connected to the 6th pin of chip U2, and the current-limiting resistor R9 is also connected to the 7th pin of chip U2; when there is current passing through the sampling resistor RL, a voltage drop is generated. One end of the sampling resistor RL is connected to the current-limiting resistors R10, R9, and R7, and single-ended operation is performed via the 6th, 7th, and 10th pins of chip U2. The other end of the sampling resistor RL performs a comparison operation via the 16th pin to obtain the current value.

[0023] In this embodiment, the display module is an LED digital tube display screen, and the 2nd, 3rd, 4th, 13th, 14th, and 15th pins of chip U2 output corresponding level information to the LE1 digital tube display screen.

[0024] The above embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A detection circuit for a bidirectional adapter, the detection circuit is used to display the charging value of the terminal power supply, characterized in that: The detection circuit includes at least two connectors connected in series through sampling resistors, and the two connectors are coupled to a detection operation unit through a voltage divider resistor. The input pin on the detection operation unit is coupled to the two ends of the sampling resistor. The detection operation unit converts the corresponding electrical signal to the display module according to the collected voltage value and current value.

2. The detection circuit of a bidirectional adapter according to claim 1, characterized in that: The invention also comprises an LDO module, which is coupled to the detection operation unit and provides a stepped-down working voltage to the detection operation unit.

3. The detection circuit of a bidirectional adapter according to claim 1, characterized in that: It also includes a current limiting resistor, the sampling resistor is connected in series to the negative pole in the loop between the connectors, and the current passes through the sampling resistor and the current limiting resistor in sequence and is coupled to the detection operation unit.

4. The detection circuit of a bidirectional adapter according to claim 1, characterized in that: The detection operation unit is a 32D02 MCU chip.

5. The detection circuit of a bidirectional adapter according to claim 1, characterized in that: At least two voltage-dividing resistors are provided, the voltage-dividing resistors are coupled to each other, at least one voltage-dividing resistor is connected to the detection operation unit, and the other voltage-dividing resistor is grounded.

6. The detection circuit of a bidirectional adapter according to claim 2, characterized in that: The LDO module is a step-down device of model HV6403A33R.

7. The detection circuit of a bidirectional adapter according to claim 1, characterized in that: An input capacitor and an output capacitor are coupled to the input and output ports of the LDO module respectively.

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