Interface control circuit and power supply device

Abstract

The utility model provides an interface control circuit and a power supply device, the interface control circuit comprises a control circuit, a power supply circuit and an interface module, the first connecting end of the interface module is electrically connected with the output end of the power supply circuit and the input end of the control circuit respectively, and the second connecting end is grounded. The output end of the control circuit is electrically connected with the input end of the power supply circuit, the access condition of a load at the plugging end of the interface module can influence the level state of the input end of the control circuit, and the control circuit can control the power supply circuit to be switched on or switched off according to the level state of the input end of the control circuit. The power supply circuit supplies power to the load through the interface module, and the power supply circuit does not output voltage to the interface module under the condition that the power supply circuit is disconnected. The interface control circuit is simple in structure, low in requirement for product layout, capable of meeting design requirements of circuit boards small in size, low in power consumption and low in processing cost.

Description

Technical Field

[0001] The utility model relates to the technical field of USB interfaces, in particular to an interface control circuit and a power supply device. Background Art

[0002] At present, in the USB (Universal Serial Bus) interface wake-up mode, the wake-up detection is usually implemented by whether there is a load connected to the USB interface. When the USB interface is connected to the load, the power supply circuit is awakened and the load is powered through the USB interface. When the USB interface is not connected to the load, the power supply circuit remains in a dormant state and does not supply power to save power consumption of the circuit. However, in the prior art, the structure of the USB interface control circuit is relatively complex, the spatial layout requirements for product design are relatively high, and the processing cost is relatively high. Utility Model Content

[0003] In view of this, the utility model provides an interface control circuit and a power supply device to at least solve the problem that the existing USB interface control circuit has a complex structure and has high requirements for the spatial layout of the product.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] The utility model provides an interface control circuit, comprising a control circuit, a power supply circuit and an interface module;

[0006] The interface module comprises a plug-in terminal, a first connection terminal and a second connection terminal, the plug-in terminal is used to connect to a load, the first connection terminal is electrically connected to the output terminal of the power supply circuit and the input terminal of the control circuit respectively, and the second connection terminal is grounded;

[0007] The output end of the control circuit is electrically connected to the input end of the power supply circuit, and the control circuit is used to control the on or off of the power supply circuit according to the level state of its input end.

[0008] Optionally, the control circuit includes a control chip, and the control chip includes an enable pin and a load pin;

[0009] The enable pin of the control chip is electrically connected to the input end of the power supply circuit, and the load pin of the control chip is electrically connected to the first connection end.

[0010] Optionally, the control circuit further includes a pull-up resistor, and the pull-up resistor is electrically connected to a load pin of the control chip.

[0011] Optionally, the resistance of the pull-up resistor is not greater than 100 mΩ.

[0012] Optionally, the control circuit further includes a unidirectional diode, an anode of the unidirectional diode is electrically connected to a load pin of the control chip, and a cathode of the unidirectional diode is electrically connected to the first connection end.

[0013] Optionally, the power supply circuit includes a DC-DC chip, and the DC-DC chip includes an enable pin and a switch pin;

[0014] The enable pin of the DC-DC chip is electrically connected to the enable pin of the control chip, and the switch pin of the DC-DC chip is electrically connected to the first connection end.

[0015] Optionally, the control circuit further includes a key switch, and the key switch is electrically connected to the control chip;

[0016] When the key switch is pressed, the enable pin of the control chip outputs a high level to the enable pin of the DC-DC chip. Optionally, an overcurrent protection circuit is further included, the overcurrent protection circuit is electrically connected to the second connection end, and is used to detect the current of the interface module;

[0017] The control circuit is also electrically connected to the overcurrent protection circuit, and is used to control the on or off of the power supply circuit according to the current size detected by the overcurrent protection circuit.

[0018] Optionally, the overcurrent protection circuit includes a current sensing resistor, and the resistance of the current sensing resistor is not greater than 10 mΩ.

[0019] The utility model also provides a power supply device, comprising any one of the above-mentioned interface control circuits.

[0020] Compared with the prior art, the interface control circuit and power supply device described in the utility model have the following advantages:

[0021] The interface control circuit of the utility model includes a control circuit, a power supply circuit and an interface module. The first connection end of the interface module is electrically connected to the output end of the power supply circuit and the input end of the control circuit respectively, and the second connection end is grounded. The output end of the control circuit is electrically connected to the input end of the power supply circuit. The access of the load at the plug-in end of the interface module will affect the level state of the input end of the control circuit. The control circuit can control the conduction or disconnection of the power supply circuit according to the level state of its input end. When the power supply circuit is turned on, the power supply circuit supplies power to the load through the interface module. When the power supply circuit is disconnected, the power supply circuit will not output voltage to the interface module. The interface control circuit of the utility model has a simple structure, has low requirements for product layout, can meet the design requirements of some small circuit boards, and has low power consumption and processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0023] Figure 1 It is a schematic diagram of component connections of an interface control circuit in an embodiment of the utility model;

[0024] Figure 2 It is a circuit structure diagram of an interface control circuit in an embodiment of the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments 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.

[0026] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the utility model can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0027] It should be understood that the reference to "some embodiments" throughout the specification means that specific features, structures or characteristics related to the embodiments are included in at least one embodiment of the utility model. Therefore, the "in some embodiments" appearing in various places throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0028] The following describes in detail an interface control circuit and a power supply device provided by the utility model by listing specific embodiments.

[0029] Figure 1 FIG. 1 shows a schematic diagram of the connection of components of an interface control circuit in an embodiment of the present utility model, referring to FIG. Figure 1The utility model provides an interface control circuit, comprising a control circuit 1, a power supply circuit 2 and an interface module 3; the interface module 3 comprises a plug-in terminal, a first connection terminal and a second connection terminal, the plug-in terminal is used to connect a load, the first connection terminal is electrically connected to the output terminal of the power supply circuit 2 and the input terminal of the control circuit 1 respectively, and the second connection terminal is grounded; the output terminal of the control circuit 1 is electrically connected to the input terminal of the power supply circuit 2, and the control circuit 1 is used to control the conduction or disconnection of the power supply circuit 2 according to the level state of its input terminal.

[0030] Specifically, the interface module 3 is mainly for various USB interfaces, including Type-A, Type-B, Type-C, miniUSB, etc. The interface module 3 includes a plug-in end, a first connection end, and a second connection end. The plug-in end is often designed in the form of a slot, and a metal conductor is arranged in the slot. The connection terminal of the load is inserted into the slot and contacts the metal conductor to realize the electrical connection between the load and the interface module 3, that is, to realize the access of the load. The first connection end of the interface module 3 is electrically connected to the power supply circuit 2 and the control circuit 1 respectively, and the second connection end of the interface module 3 is grounded (such as Figure 1 The output end of the control circuit 1 is electrically connected to the input end of the power supply circuit 2, and the control circuit 1 is used to control the on or off of the power supply circuit 2 according to the level state of its input end. Of course, the interface control circuit also includes a power supply module, which is electrically connected to the control circuit 1 and the power supply circuit 2, respectively, and is used to supply power to the control circuit 1 and the power supply circuit 2 to ensure the normal operation of the control circuit 1 and the power supply circuit 2. When the power supply circuit 2 is on, the power supply circuit 2 can supply power to the load through the interface module 3. When the power supply circuit 2 is disconnected, the power supply circuit 2 will not output voltage to the interface module 3, and then will not supply power to the load through the interface module 3.

[0031] In a specific embodiment, the first connection end of the interface module 3 is electrically connected to the input end of the control circuit 1. When a load is inserted into the plug-in end of the interface module 3, the load will realize the electrical connection between the first connection end and the second connection end of the interface module 3. Since the second connection end is grounded, when the first connection end and the second connection end of the interface module 3 are electrically connected, the second connection end of the interface module 3 will pull down the level of the first connection end, so that the first connection end is in a low level state. The first connection end of the interface module 3 is electrically connected to the input end of the control circuit 1. When the first connection end of the interface module 3 is in a low level state, the input end of the control circuit 1 receives a low level signal. The output end of the control circuit 1 is electrically connected to the input end of the power supply circuit 2. When the control circuit 1 receives a low level signal at its input end, it will output a high level to the input end of the power supply circuit 2, so that the power supply circuit 2 is turned on, and then the power supply circuit 2 can supply power to the load through the interface module 3 to realize the charging of the load. On the contrary, when there is no load inserted into the plug-in end of the interface module 3, the first connection end and the second connection end of the interface module 3 are independent of each other and complement each other. The first connection end of the interface module 3 remains in a high level state, and the level state does not change, and then does not affect the level state of the input end of the control circuit 1. The level of the input end of the control circuit 1 remains in a high level state accordingly. In this case, the control circuit 1 outputs a low level to the input end of the power supply circuit 2, disconnecting the power supply circuit 2, and then the power supply circuit 2 will not output voltage to the interface module 3, thereby saving the overall power consumption of the interface control circuit.

[0032] The interface control circuit of the utility model includes a control circuit 1, a power supply circuit 2 and an interface module 3. The first connection end of the interface module 3 is electrically connected to the output end of the power supply circuit 2 and the input end of the control circuit 1 respectively, and the second connection end is grounded. The output end of the control circuit 1 is electrically connected to the input end of the power supply circuit 2. The access of the load at the plug-in end of the interface module 3 will affect the level state of the input end of the control circuit 1. The control circuit 1 can control the conduction or disconnection of the power supply circuit 2 according to the level state of its input end. When the power supply circuit 2 is turned on, the power supply circuit 2 supplies power to the load through the interface module 3. When the power supply circuit 2 is disconnected, the power supply circuit 2 will not output voltage to the interface module 3. The interface control circuit of the utility model has a simple structure, low requirements for product layout, can meet the design requirements of some small circuit boards, and has low power consumption and processing cost.

[0033] Figure 2 A schematic diagram of the circuit structure of an interface control circuit in an embodiment of the utility model is shown, referring to Figure 2The control circuit 1 includes a control chip U1, and the control chip U1 includes an enable pin and a load pin; the enable pin of the control chip U1 is electrically connected to the input end of the power supply circuit 2, and the load pin of the control chip U1 is electrically connected to the first connection end.

[0034] Specifically, the control chip U1 is essentially a MCU (Microcontroller Unit). The MCU is a chip-level computer formed by appropriately reducing the frequency and specifications of the central processing unit and integrating various interfaces and circuits on a single chip. The MCU can perform different combinations of control for different application scenarios. The control chip U1 includes four pins, such as Figure 2 As shown in pins 1 to 4, pin 1 is the power pin, connected to VCC, such as Figure 2 Pin 1 and power module ( Figure 2 The power module supplies power to the control chip U1 through pin 1 to ensure the normal operation of the control chip U1. Pin 2 is a ground pin, connected to GND. Pin 3 is an enable pin, which is the Enable pin and is usually represented by EN in the circuit structure. Only when this pin is activated can the control chip U1 control each module or circuit to work normally. Pin 4 is a load pin, which is the Load Switch pin and is usually represented by LOAD in the circuit structure. In this embodiment, the load pin is electrically connected to the first connection end of the interface module 3 for detecting the load access status of the plug-in end of the interface module 3. In this embodiment, the interface module 3 is as shown in FIG. Figure 2 As shown in the USB in FIG. 1 , the USB pin 1 represents the first connection end of the interface module 3 , the USB pin 4 represents the second connection end of the interface module 3 , and the USB pins 2 and 3 represent the plug-in ends of the interface module 3 .

[0035] In this embodiment, the enable pin of the control chip U1 is effective at a high level, that is, the pin 3 of the control chip U1 is effective at a high level. When the pin 3 of the control chip U1 is set to a high level, the control chip U1 can control the power supply circuit 2 to be turned on. Specifically, when the interface module 3 is not connected to a load, the control chip U1 sets its pin 3 to a low level, and the pin 3 of the control chip U1 is electrically connected to the input end of the power supply circuit 2, and outputs a low level to the input end of the power supply circuit 2, so that the power supply circuit 2 remains in a disconnected state, and no voltage is output to the interface module 3. When the interface module 3 is connected to a load, the control chip U1 sets its pin 3 to a high level, and the pin 3 of the control chip U1 outputs a high level to the input end of the power supply circuit 2, so that the power supply circuit 2 remains in a conducting state, thereby supplying power to the load through the interface module 3. Further, when the plug-in end of the interface module 3 is connected to a load, that is, when pins 2 and 3 of the interface module 3 are connected to a load, pin 1 and pin 4 of the interface module 3 are connected, and pin 4 will pull down the level of pin 1, and then pin 1 will output a low level to pin 4 of the control chip U1, pulling down pin 4 of the control chip U1. It should be noted that pin 4 of the control chip U1 is in a high level state by default to ensure that pin 4 can be pulled down by pin 1 of the interface module 3. The control chip U1 can detect the level change of its pin 4, and after detecting that its pin 4 is pulled down, it will control its pin 3 to be set to a high level, thereby outputting a high level to the input end of the power supply circuit 2, so that the power supply circuit 2 is turned on and supplies power to the load through the interface module 3. Correspondingly, when pins 2 and 3 of the interface module 3 are not connected to a load, pin 4 of the control chip U1 remains in a high level state, pin 3 of the control chip U1 remains in a low level state, and the power supply circuit 2 remains in a disconnected state, and no voltage is output to the interface module 3.

[0036] Optionally, refer to Figure 2 The control circuit 1 further includes a pull-up resistor R1, and the pull-up resistor R1 is electrically connected to a load pin of the control chip U1.

[0037] Specifically, the pull-up resistor R1 is usually connected to a fixed power supply and can clamp an uncertain signal at a fixed high level. In the control circuit 1 of this embodiment, one end of the pull-up resistor R1 is electrically connected to the load pin of the control chip U1, that is, pin 4, and the other end is electrically connected to a power supply module. When the interface module 3 is not connected to the load, the pull-up resistor R1 can keep the load pin of the control chip U1 in a high level state, thereby ensuring that when the interface module 3 is connected to the load, the load pin of the control chip U1 can be smoothly pulled down by the first connection end of the interface module 3.

[0038] Optionally, the resistance of the pull-up resistor R1 is not greater than 100 mΩ.

[0039] Specifically, if the resistance of the pull-up resistor R1 is too large, the current it can flow is small, and it can only provide a weak pull-up for the load pin of the control chip U1. If the resistance of the pull-up resistor R1 is small, the current it can flow is large, and it can provide a strong pull-up for the load pin of the control chip U1. In the strong pull-up mode, the load pin of the control chip U1 is maintained in a high level state with higher reliability, and the stability of the load pin is also higher, and it is not easy to cause malfunction, resulting in the control chip U1 to misjudge and change the level of its enable pin. Therefore, in this embodiment, the resistance of the pull-up resistor R1 is set to be no more than 100mΩ to improve the stability of the control circuit 1.

[0040] Optionally, refer to Figure 2 The control circuit 1 further includes a unidirectional diode D1, an anode of the unidirectional diode D1 is electrically connected to the load pin of the control chip U1, and a cathode of the unidirectional diode D1 is electrically connected to the first connection end.

[0041] Specifically, the unidirectional diode D1 is composed of a P-type semiconductor and an N-type semiconductor, the P-type semiconductor forms the positive electrode of the unidirectional diode D1, and the N-type semiconductor forms the negative electrode of the unidirectional diode D1. When a positive voltage is applied to the positive electrode of the unidirectional diode D1 and a negative voltage is applied to the negative electrode, the unidirectional diode D1 will be turned on. When the unidirectional diode D1 is turned on, the current can only flow from the positive electrode to the negative electrode of the unidirectional diode D1. In this embodiment, the positive electrode of the unidirectional diode D1 is electrically connected to the load pin of the control chip U1, that is, pin 4, and the negative electrode of the unidirectional diode D1 is electrically connected to the first connection end of the interface module 3, that is, pin 1 of the USB, so that the current can only flow from the load pin of the control chip U1 to the first connection end of the interface module 3, avoiding the load current from flowing back to the control chip U1, thereby ensuring both the charging effect of the load and the normal operation of the control chip U1.

[0042] Optionally, refer to Figure 2 The power supply circuit 2 includes a DC-DC chip U2, and the DC-DC chip U2 includes an enable pin and a switch pin; the enable pin of the DC-DC chip U2 is electrically connected to the enable pin of the control chip U1, and the switch pin of the DC-DC chip U2 is electrically connected to the first connection end.

[0043] Specifically, the DC-DC (Direct Current, DC-DC converter) chip takes a DC voltage as input and outputs a different DC voltage, and the output DC voltage can be higher or lower than the input DC voltage. The DC-DC chip U2 in this embodiment is electrically connected to the power module, and can convert the power supply voltage with a larger voltage range into a module voltage with a smaller voltage range. The range of the module voltage needs to be adapted to the rated voltage of the load connected to the interface module 3. If the rated voltage of the load connected to the interface module 3 is larger, the voltage output by the DC-DC chip U2 for the interface module 3 is correspondingly larger. If the rated voltage of the load connected to the interface module 3 is smaller, the voltage output by the DC-DC chip U2 for the interface module 3 is correspondingly smaller. The specific voltage parameters are not limited in this embodiment.

[0044] The DC-DC chip U2 includes four pins, such as Figure 2 As shown in pins 1 to 4, pin 1 is the power pin, connected to VCC, such as Figure 2 Pin 1 is electrically connected to the power module, and the power module supplies power to the control chip U1 through pin 1 to ensure the normal operation of the control chip U1. Pin 2 is a ground pin connected to GND. Pin 3 is an enable pin. Only when this pin is activated can the DC-DC chip U2 turn on the power supply circuit and output voltage to the interface module 3. The enable pin of the DC-DC chip U2 is electrically connected to the enable pin of the control chip U1. The level state of the enable pin of the DC-DC chip U2 is determined by the level state of the enable pin of the control chip U1. When the control chip U1 sets its enable pin level high, the enable pin of the DC-DC chip U2 becomes high accordingly, and the DC-DC chip U2 is turned on to supply power to the load through the interface module 3. When the control chip U1 sets its enable pin level low, the enable pin of the DC-DC chip U2 becomes low accordingly, and the DC-DC chip U2 is turned off and stops outputting voltage to the interface module 3. Pin 4 is a switch pin, i.e., a Switch pin, which is usually represented by a SW pin in the circuit structure. The switch pin is electrically connected to the first connection end of the interface module 3. When the DC-DC chip U2 is turned on, the DC-DC chip U2 outputs a voltage to the first connection end of the interface module 3 through the switch pin. When the DC-DC chip U2 is turned off, the DC-DC chip U2 cannot output a voltage to the first connection end of the interface module 3 through the switch pin.

[0045] Optionally, the control circuit 1 further comprises a key switch, which is electrically connected to the control chip U1; when the key switch is pressed, the enable pin of the control chip U1 outputs a high level to the enable pin of the DC-DC chip U2.

[0046] Specifically, when the key switch is pressed, the enable pin of the control chip U1 outputs a high level for the enable pin of the DC-DC chip U2. In combination with the above-mentioned embodiment, the level state of the enable pin of the DC-DC chip U2 is determined by the level state of the enable pin of the control chip U1. When the control chip U1 sets the level of its enable pin high, the control chip U1 outputs a high level for the enable pin of the DC-DC chip U2, so that the enable pin of the DC-DC chip U2 becomes high accordingly. At this time, the DC-DC chip U2 is turned on and supplies power to the load through the interface module 3. Since the level state of the enable pin of the control chip U1 is determined by the level state of its load pin, if the load is inserted into the interface module 3, and the load pin of the control chip U1 is not effectively pulled down by the first connection end of the interface module 3, the control chip U1 will not set the level of its enable pin high, which ultimately causes the DC-DC chip U2 to be unable to output voltage to the load through the interface module 3 in a timely manner. Therefore, this embodiment adds a push button switch, which can control the on or off of the DC-DC chip U2. When the push button switch is pressed, the enable pin of the control chip U1 outputs a high level to the enable pin of the DC-DC chip U2, so that the DC-DC chip U2 is turned on, thereby supplying power to the load through the interface module 3 in time, further improving the reliability of the interface control circuit.

[0047] Optionally, refer to Figure 2 The interface control circuit also includes an overcurrent protection circuit, which is electrically connected to the second connection end and is used to detect the current of the interface module 3; the control circuit 1 is also electrically connected to the overcurrent protection circuit and is used to control the conduction or disconnection of the power supply circuit 2 according to the current size detected by the overcurrent protection circuit.

[0048] Specifically, the interface control circuit includes an overcurrent protection circuit, so that the interface control circuit has an overcurrent protection function, namely, an OCP (Over Current Protection) function. The overcurrent protection function is a measure of protection that is predetermined to perform a corresponding protection action when the current of the high-power DC regulated power supply under test increases and exceeds the allowable value. If the load current is too large, it is easy to cause the related electronic components in the circuit structure to heat up or burn out, etc. Therefore, the interface control circuit has an overcurrent protection function, which can effectively ensure the safety of the use of various electronic components in the circuit and maintain the normal operation of the circuit. In this embodiment, the overcurrent protection circuit is electrically connected to the second connection end of the interface module 3, and is used to detect the current size of the interface module 3. In some embodiments, the overcurrent protection circuit can be integrated inside the control chip U1, so that the control chip U1 includes an overcurrent detection pin, such as Figure 2As shown in pin 5 in the figure, the overcurrent detection pin of the control chip U1 is electrically connected to the second connection end of the interface module 3. In other embodiments, the interface control circuit includes an overcurrent protection module, which is electrically connected to the control chip U1 and is also electrically connected to the second connection end of the interface module 3. The overcurrent protection module can detect the current size of the interface module 3. The control circuit 1 can control the on or off of the power supply circuit 2 according to the current size detected by the overcurrent protection circuit. Specifically, as the power supply circuit 2 increases the time for the load to be powered, the load power continues to increase. When the load power is close to full, the load current decreases, and the current of the interface module 3 detected by the overcurrent protection circuit decreases accordingly. When the current is less than the preset current, the control circuit 1 will control the power supply circuit 2 to disconnect, so that the power supply circuit 2 stops charging the load. Under normal circumstances, when the load power is close to full, the current flowing through it is approximately in the range of 20mA to 80mA, so the preset current is set to 80mA. When the current detected by the overcurrent protection circuit is less than 80mA, the control circuit 1 will control the power supply circuit 2 to disconnect and stop charging the load.

[0049] Optionally, refer to Figure 2 The overcurrent protection circuit includes a current sensing resistor R2, and the resistance of the current sensing resistor R2 is not greater than 10mΩ.

[0050] Specifically, one end of the current-sensing resistor R2 is electrically connected to the overcurrent protection pin of the control chip U1, i.e., pin 5, and the other end is grounded. If the resistance of the current-sensing resistor R2 is too large, the current flowing through the overcurrent protection circuit will be too small, affecting the ability of the overcurrent protection circuit to detect current. Therefore, in this embodiment, the resistance of the current-sensing resistor R2 is set to be no more than 10mΩ to ensure the detection capability and detection accuracy of the overcurrent protection circuit.

[0051] The utility model also provides a power supply device, comprising any one of the above-mentioned interface control circuits.

[0052] Specifically, the power supply device can be a battery pack, an energy storage cabinet, a lithium-ion battery or other products, or it can be a power supply system. The power supply device includes an interface control circuit of any of the aforementioned embodiments, and can supply power to the load only when the load is connected, thereby saving power consumption of the power supply device.

[0053] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An interface control circuit, characterized in that: It includes a control circuit, a power supply circuit and an interface module; The interface module comprises a plug-in terminal, a first connection terminal and a second connection terminal, the plug-in terminal is used to connect to a load, the first connection terminal is electrically connected to the output terminal of the power supply circuit and the input terminal of the control circuit respectively, and the second connection terminal is grounded; The output end of the control circuit is electrically connected to the input end of the power supply circuit, and the control circuit is used to control the on or off of the power supply circuit according to the level state of its input end; The interface control circuit further includes an overcurrent protection circuit, which is electrically connected to the second connection terminal and is used to detect the current of the interface module; the control circuit is also electrically connected to the overcurrent protection circuit and is used to control the on or off of the power supply circuit according to the current detected by the overcurrent protection circuit; The overcurrent protection circuit includes a current sensing resistor, and the resistance of the current sensing resistor is not greater than 10 mΩ.

2. The interface control circuit according to claim 1, characterized in that: The control circuit includes a control chip, and the control chip includes an enable pin and a load pin; The enable pin of the control chip is electrically connected to the input end of the power supply circuit, and the load pin of the control chip is electrically connected to the first connection end.

3. The interface control circuit according to claim 2, characterized in that: The control circuit further includes a pull-up resistor, and the pull-up resistor is electrically connected to a load pin of the control chip.

4. The interface control circuit according to claim 3, characterized in that: The resistance of the pull-up resistor is not greater than 100 mΩ.

5. The interface control circuit according to claim 2, characterized in that: The control circuit further includes a unidirectional diode, an anode of the unidirectional diode is electrically connected to a load pin of the control chip, and a cathode of the unidirectional diode is electrically connected to the first connection end.

6. The interface control circuit according to claim 2, characterized in that: The power supply circuit includes a DC-DC chip, and the DC-DC chip includes an enable pin and a switch pin; The enable pin of the DC-DC chip is electrically connected to the enable pin of the control chip, and the switch pin of the DC-DC chip is electrically connected to the first connection end.

7. The interface control circuit according to claim 6, characterized in that: The control circuit further comprises a key switch, and the key switch is electrically connected to the control chip; When the key switch is pressed, the enable pin of the control chip outputs a high level for the enable pin of the DC-DC chip.

8. A power supply device, characterized in that: The interface control circuit comprises the interface control circuit as claimed in any one of claims 1 to 7.

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