Detection circuit, charging system and autonomous operation equipment

Abstract

The utility model discloses a detection circuit, a charging system and autonomous operation equipment. The detection circuit comprises a detection interface, the detection interface is used for connecting a charging interface, and the charging interface is used for connecting to-be-charged equipment through a first port and a second port; the on-pile detection module is connected to the first port of the charging interface and is used for outputting a first voltage signal according to the voltage of the first port of the charging interface; and the control module is connected with the on-pile detection module and is used for determining the connection state of the to-be-charged equipment and the charging interface according to the difference between the first voltage signal and a first preset threshold voltage. According to the technical scheme provided by the embodiment of the utility model, the on-pile state of the autonomous operation equipment is effectively judged, so that the autonomous operation equipment cannot be frequently restarted and turned on or turned off, and the service life of the autonomous operation equipment is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of charging detection technology, and in particular to a detection circuit, a charging system, and an autonomous operating device. Background Technology

[0002] Existing charging systems disconnect power to autonomous operating equipment immediately after charging is complete. If the equipment remains stationary at the charging station, it will automatically shut down due to prolonged lack of power. When the equipment shuts down, the charging system instantly applies voltage to turn it back on, causing frequent restarts and power cycles. Therefore, current technology cannot effectively determine the stationary status of autonomous operating equipment. Utility Model Content

[0003] This invention provides a detection circuit, a charging system, and an autonomous operating device to solve the problem that the inability to effectively determine the on-site status of the autonomous operating device leads to frequent restarts and power-on / off cycles, affecting the lifespan of the autonomous operating device.

[0004] According to one aspect of the present invention, a detection circuit is provided, comprising:

[0005] A detection interface is used to connect to a charging interface, which is used to connect to a device to be charged via a first port and a second port.

[0006] In the pile detection module, connected to the first port of the charging interface, it is used to output a first voltage signal according to the voltage of the first port of the charging interface;

[0007] A control module, connected to the on-pile detection module, is used to determine the connection status between the device to be charged and the charging interface based on the difference between the first voltage signal and the first preset threshold voltage.

[0008] Optionally, the pile detection module includes: a first resistor and a first diode;

[0009] The first resistor is connected between the first port of the charging interface and the control module to limit the current input to the control module;

[0010] The first diode is connected in parallel between the first resistor and the ground terminal to limit the voltage of the first voltage signal and input the processed first voltage signal into the control module.

[0011] The control module is used to determine that the device to be charged and the charging interface are connected when the processed first voltage signal is equal to the first preset threshold voltage.

[0012] The control module is also used to determine that the device to be charged is disconnected from the charging interface when the processed first voltage signal is less than the first preset threshold voltage.

[0013] Optionally, the detection circuit further includes:

[0014] A voltage detection module is connected to the second port of the charging interface and the control module. The voltage detection module is used to collect the voltage of the second port of the charging interface and generate a second voltage signal.

[0015] The control module is used to determine the charging status of the device to be charged based on the difference between the second voltage signal and the second preset threshold; the second preset threshold is greater than the first preset threshold.

[0016] Optionally, the voltage detection module includes: a second resistor and a third resistor;

[0017] The first end of the second resistor is connected to the second port of the charging interface, the second end of the second resistor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the ground terminal; the second end of the second resistor is also connected to the control module.

[0018] The second resistor and the third resistor are used to divide the voltage at the second port of the charging interface and generate the second voltage signal.

[0019] Optionally, the device to be charged includes an infrared receiving module, which is communicatively connected to an infrared emitting module, and the infrared emitting module is connected to the control module.

[0020] The control module is used to determine that the device to be charged and the charging interface are connected when the first voltage signal is equal to the first preset threshold voltage, and to control the infrared emitting module to turn off.

[0021] The control module is used to determine that the device to be charged is disconnected from the charging interface when the first voltage signal is less than the first preset threshold voltage, and to control the infrared emitting module to turn on.

[0022] According to another aspect of the present invention, a charging system is provided, comprising: the detection circuit described in any embodiment of the present invention; the charging system further comprises: a first branch and a second branch;

[0023] The first branch is used to limit the transient voltage in the charging system during the first power-on phase; the first power-on phase is the initial power-on phase;

[0024] The second branch is used to turn on during the second power-on phase and short-circuit the first branch; the first power-on phase precedes the second power-on phase.

[0025] Optionally, the charging system further includes: a switching unit connected between the second branch and the control module of the detection circuit;

[0026] The control module is used to generate a first level signal when the second voltage signal is less than a second preset threshold voltage, and the switching unit controls the second branch to be turned on according to the first level signal;

[0027] The control module is used to generate a second level signal when the second voltage signal is equal to the second preset threshold voltage, and the switching unit controls the second branch to disconnect according to the second level signal.

[0028] Optionally, the first branch includes: a second diode, the positive terminal of the second diode being connected to the first port of the charging interface, and the negative terminal of the second diode being grounded;

[0029] The second branch includes: a first transistor, the first terminal of which is connected to the first port of the charging interface, the second terminal of which is grounded, and the control terminal of which is connected to the switching unit;

[0030] The switching unit is used to control the first transistor to turn on according to the first level signal and to turn on the second branch; the switching unit is also used to control the first transistor to turn off according to the second level signal and to turn off the second branch.

[0031] Optionally, the switching unit includes: a first transistor and a second transistor;

[0032] The first terminal of the first transistor is connected to the control terminal of the second transistor, the second terminal of the first transistor is grounded, and the control terminal of the first transistor is connected to the control module; the first transistor is used to turn on according to the first level signal and also to turn off according to the second level signal;

[0033] The first end of the second transistor is connected to the power supply, and the second end of the second transistor is connected to the control terminal of the first transistor; the second transistor is used to conduct when the first transistor is turned on, and input the power supply voltage to the control terminal of the first transistor; the first transistor is used to conduct according to the power supply voltage.

[0034] According to another aspect of the present invention, an autonomous operating device is provided, characterized in that it includes: an infrared receiving module;

[0035] The autonomous operating device is charged by the charging system described in any embodiment of the present invention, and the charging status of the autonomous operating device is detected by the detection circuit described in any embodiment of the present invention.

[0036] The technical solution provided by this utility model embodiment realizes voltage detection at the first port of the charging interface by setting a pile detection module. By comparing the voltage with a first preset threshold, the connection status between the device to be charged and the charging interface can be determined. This utility model, through on-pile detection of the device to be charged, ensures that the charging interface continuously provides power to the device to be charged, whether it is charging or fully charged, keeping the device powered on and preventing frequent power-on and power-off cycles after it is fully charged, thus improving the lifespan of the device.

[0037] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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 these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of a detection circuit according to an embodiment of the present utility model;

[0040] Figure 2 This is a schematic diagram of another detection circuit provided according to an embodiment of the present utility model;

[0041] Figure 3 This is a schematic diagram of another detection circuit provided according to an embodiment of the present utility model;

[0042] Figure 4 This is a schematic diagram of a charging system according to an embodiment of the present utility model;

[0043] Figure 5 This is a schematic diagram of another charging system provided according to an embodiment of the present utility model. Detailed Implementation

[0044] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0045] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0046] This utility model embodiment provides a detection circuit. Figure 1 This is a schematic diagram of a detection circuit provided in an embodiment of the present invention, with reference to... Figure 1 The detection circuit includes: a detection interface 1, an on-site detection module 2, and a control module 3. The detection interface 1 is used to connect to a charging interface 11, which is used to connect a device to be charged through a first port and a second port. The on-site detection module 2 is connected to the first port of the charging interface 11 and is used to output a first voltage signal based on the voltage at the first port of the charging interface 11. The control module 3 is connected to the on-site detection module 2 and is used to determine the connection status between the device to be charged and the charging interface 11 based on the difference between the first voltage signal and a first preset threshold voltage.

[0047] When the device to be charged is charging, it can be charged by connecting to the first port and the second port of the charging interface 11. For example, the device to be charged can be an autonomous operating device, including an automatic lawnmower. When the internal battery power is low, the automatic lawnmower can automatically drive to the charging interface 11 and connect to the first port and the second port for charging.

[0048] Because detection interface 1 is connected to charging interface 11, the voltage at the first port of charging interface 11 can be detected by the pile detection module 2. When the device to be charged is charging, a loop is formed between charging interface 11, the power supply, and the ground terminal. Therefore, the first port of charging interface 11 has a first voltage signal greater than 0. For example, the first voltage signal at this time can be 0.5V, and the first preset threshold can be 0.5V. When the first voltage signal equals the first preset threshold, it indicates that the device to be charged is connected to the charging interface and the device to be charged is in the pile. At this time, when the device to be charged is not fully charged, the power supply can charge the device to be charged through charging interface 11. When the device to be charged is fully charged, the power supply can also continuously provide current and voltage to the device to be charged, so that the device to be charged will not shut down when fully charged. Through this setting, the device to be charged can be prevented from restarting after the pile is turned off due to receiving power supply voltage, thus avoiding frequent restarts.

[0049] When the device to be charged is not charging, the circuit between the power supply, charging interface 11, and grounding terminal is broken, and the first voltage signal at the first port of charging interface 11 is approximately 0V. If the first voltage signal is less than a first preset threshold, it indicates that the device to be charged is not connected to the charging interface and is not at the charging station.

[0050] The technical solution provided by this utility model embodiment realizes voltage detection at the first port of the charging interface by setting a pile detection module. By comparing the voltage with a first preset threshold, the connection status between the device to be charged and the charging interface can be determined. This utility model, through on-pile detection of the device to be charged, ensures that the charging interface continuously provides power to the device to be charged, whether it is charging or fully charged, keeping the device powered on and preventing frequent power-on and power-off cycles after it is fully charged, thus improving the lifespan of the device.

[0051] Figure 2 This is a schematic diagram of another detection circuit provided in an embodiment of the present invention, with reference to... Figure 2 Based on the above embodiments, optionally, the pile detection module 2 includes: a first resistor R1 and a first diode Z1. The first resistor R1 is connected between the first port of the charging interface 11 and the control module 3 to limit the current input to the control module 3. The first diode Z1 is connected in parallel between the first resistor R1 and the ground terminal to limit the voltage of the first voltage signal and input the processed first voltage signal to the control module 3. The control module 3 is used to determine that the device to be charged and the charging interface 11 are connected when the processed first voltage signal is equal to a first preset threshold voltage. The control module 3 is also used to determine that the device to be charged and the charging interface 11 are disconnected when the processed first voltage signal is less than the first preset threshold voltage.

[0052] To improve the reliability of the operation of the control module 3, a first resistor R1 can be set between the first port of the charging interface 11 and the control module 3. When the current input to the control module 3 is too large, the first resistor R1 can limit the current input to the control module 3, thereby avoiding damage to the control module 3 due to the large current.

[0053] When the voltage of the first voltage signal is too high, it can also damage the control module 3. By setting the first diode Z1, when the voltage of the first voltage signal is too high, the first diode Z1 will be broken down and the first voltage signal will be grounded, so that the control module 3 can operate reliably.

[0054] For example, the pile detection module 2 may also include a first capacitor C1 connected in parallel with the first diode Z1, which can be used to filter the first voltage signal, improve the signal-to-noise ratio of the first voltage signal, make the signal collected by the control module 3 more accurate, and improve the voltage detection capability.

[0055] After the processed first voltage signal is input to the control module 3, the control module 3 can determine the connection status between the device to be charged and the charging interface based on the magnitude of the first voltage signal and the first preset threshold voltage. When the device to be charged is fully charged, it stops charging. At this time, the internal resistor of the device to be charged is connected to the charging interface 11. For example, the internal resistor can be 20kΩ. If the device to be charged is still connected to the charging interface 11, the pile detection module 2 can receive the first voltage signal.

[0056] For example, the power supply can generate a voltage of 0.5V through an internal resistor of 20kΩ, meaning the first voltage signal is 0.5V, and the first preset threshold voltage can also be set to 0.5V. When the processed first voltage signal equals the first preset threshold voltage, the device to be charged is connected to the charging interface 11.

[0057] When the device to be charged is disconnected from the charging interface 11, the first voltage signal received by the pile detection module 2 is approximately 0V. Therefore, if the processed first voltage signal is less than the first preset threshold voltage, the device to be charged is disconnected from the charging interface 11.

[0058] The on-pile detection module provided by this utility model, by setting a first resistor and a first diode, realizes the limitation of current and voltage in the line, thereby improving the operational reliability of the control module.

[0059] Continue to refer to Figure 2Based on the above embodiments, optionally, the detection circuit further includes a voltage detection module 4. Connected to the second port of the charging interface 11 and the control module 3, the voltage detection module 4 is used to collect the voltage at the second port of the charging interface 11 and generate a second voltage signal. The control module 3 is used to determine the charging state of the device to be charged based on the difference between the second voltage signal and a second preset threshold; the second preset threshold is greater than a first preset threshold.

[0060] When the device to be charged is connected to the charging interface 11, the voltage detection module 4 can be used to collect the voltage of the second port of the charging interface 11.

[0061] For example, when the power supply voltage is 25V, when the device to be charged is connected to the charging interface 11 and is charging, and the device to be charged is in a fully charged state, the device to be charged does not charge, and the voltage of the second port of the charging interface 11 is the power supply voltage. Therefore, the second preset threshold can be set to 25V. When the second voltage signal is equal to the second preset threshold, it indicates that the device to be charged is in a fully charged state.

[0062] If the device to be charged is connected to the charging interface 11 and is charging, and the device is not fully charged, the voltage collected by the voltage detection module 4 is the voltage of the battery in the device to be charged. For example, this voltage can be 20V. At this time, the second voltage signal is less than the second preset threshold, indicating that the device to be charged is in a charging state.

[0063] This embodiment of the invention incorporates a voltage detection module. By detecting the voltage at the second port of the charging interface, the control module determines the charging and non-charging states of the device to be charged based on the second voltage signal, resulting in a better detection effect.

[0064] Figure 3 This is a schematic diagram of another detection circuit provided in an embodiment of the present invention, with reference to... Figure 3 Based on the above embodiments, optionally, the voltage detection module 4 includes a second resistor R2 and a third resistor R3. The first end of the second resistor R2 is connected to the second port of the charging interface 11, the second end of the second resistor R2 is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the ground terminal; the second end of the second resistor R2 is also connected to the control module 3. The second resistor R2 and the third resistor R3 are used to divide the voltage at the second port of the charging interface 11 and generate a second voltage signal.

[0065] If the voltage of the second port of the charging interface 11 is directly input to the control module 3, the voltage detected by the control module 3 may be unstable due to excessively high voltage values ​​or voltage fluctuations. The second resistor R2 and the third resistor R3 can divide the voltage of the second port of the charging interface 11 and generate a second voltage signal. The control module 3 can determine the charging status of the device to be charged based on the difference between the second voltage signal and a second preset threshold.

[0066] Exemplarily, the detection circuit may further include a fifth resistor R5 connected between the power supply and the second port of the charging interface 11, for limiting the current at the second port of the charging interface 11. The voltage detection module 4 may further include a fourth resistor R4 connected between the second terminal of the second resistor R2 and the control module 3, for limiting the current at the input control module 3. A second capacitor C2 and a third diode Z3 may also be connected in parallel between the second terminal of the fourth resistor R4 and the ground terminal. The second capacitor C2 may be used to filter the second voltage signal. The third diode Z3 may be used to limit the voltage of the second voltage signal.

[0067] Based on the above embodiments, optionally, the device to be charged includes an infrared receiving module, which is communicatively connected to an infrared emitting module, and the infrared emitting module is connected to a control module. The control module is used to determine that the device to be charged and the charging interface are connected when the first voltage signal equals a first preset threshold voltage, and to control the infrared emitting module to turn off. Alternatively, the control module is used to determine that the device to be charged and the charging interface are disconnected when the first voltage signal is less than the first preset threshold voltage, and to control the infrared emitting module to turn on.

[0068] The infrared emitting module emits a moving infrared signal to control the device being charged to move accordingly. When the device is charging at the charging station, it does not need to move. In this case, to reduce power consumption, the control module can shut down the infrared emitting module.

[0069] When the device to be charged leaves the charging station, the control module can control the infrared emitting module to turn on and make the device to be charged move according to the infrared signal emitted by the infrared emitting module.

[0070] This utility model embodiment can control the infrared emitting module to perform different working states depending on whether the device to be charged is charging at a charging station, without affecting the normal operation of the device to be charged and with low power consumption.

[0071] This utility model embodiment also provides a charging system. The charging system includes the detection circuit provided in any embodiment of this utility model. Figure 4 This is a schematic diagram of a charging system provided in an embodiment of the present invention, with reference to... Figure 4The charging system also includes a first branch 51 and a second branch 52. The first branch 51 is used to limit the transient voltage in the charging system during the first power-on phase; the first power-on phase is the initial power-on phase. The second branch 52 is used to turn on during the second power-on phase and short-circuit the first branch 51; the first power-on phase precedes the second power-on phase.

[0072] The first power-on phase occurs the instant the device to be charged is connected to the charging interface 11. During the first power-on phase, a large transient voltage may be generated in the charging system. At this time, the first branch 51 is turned on and clamps the voltage within a safe range, which can be used to limit the voltage in the charging system.

[0073] Furthermore, the first branch 51 can only conduct in one direction. If the device to be charged is connected to the charging interface 11 in reverse, it is equivalent to the first branch 51 and the second branch 52 not conducting, and the reverse current will not damage the power supply.

[0074] When the device to be charged is connected to the charging interface 11 for a certain period of time, the second branch 52 is turned on. The second branch 52 has a low internal resistance and can short-circuit the first branch 51. The current can form a loop through the second branch 52, and the charging system can work stably.

[0075] This embodiment of the invention provides a charging system with higher stability and better charging performance by setting up a first branch 51 and a second branch 52, and by activating different branches according to different power-on stages.

[0076] Continue to refer to Figure 4 Based on the above embodiments, optionally, the charging system further includes: a switching unit 6, connected between the second branch 52 and the control module 3 of the detection circuit. The control module 3 generates a first level signal when the second voltage signal is less than a second preset threshold voltage, and the switching unit 6 controls the second branch to conduct according to the first level signal. Conversely, the control module 3 generates a second level signal when the second voltage signal is equal to the second preset threshold voltage, and the switching unit 6 controls the second branch to disconnect according to the second level signal.

[0077] The control module 3 of the charging system reuses the control module 3 of the detection circuit. When the device to be charged is connected to the charging interface 11, the system is in the first power-on stage, the first branch 51 is in the conducting state and the second branch 52 is in the off state. The first branch 51 can be used to limit the transient voltage in the charging system. At this time, the device to be charged is charging, and the second voltage signal is the battery voltage in the device to be charged. This voltage is less than the second preset threshold voltage. The control module 3 can generate a first level signal and cause the switching unit 6 to control the second branch to conduct according to the first level signal. Since the device to be charged has been charging for a certain period of time and there is no reverse connection problem, the device to be charged can form a charging circuit through the second branch and be in a stable charging state.

[0078] Once the device to be charged has finished charging, the second voltage signal becomes the power supply voltage, which is equal to the second preset threshold voltage. The control module 3 generates a second level signal and causes the switching unit 6 to control the second branch to disconnect according to the second level signal. The charging system returns to its original state. When the device to be charged is charged again, it can still form a loop through the first branch 51 during the first power-on phase, providing high safety.

[0079] Continue to refer to Figure 4 Based on the above embodiments, optionally, the first branch 51 includes: a second diode Z2, the positive terminal of the second diode Z2 is connected to the first port of the charging interface 11, and the negative terminal of the second diode Z2 is grounded. The second branch 52 includes: a first transistor Q1, the first terminal of the first transistor Q1 is connected to the first port of the charging interface 11, the second terminal of the first transistor Q1 is grounded, and the control terminal of the first transistor Q1 is connected to the switching unit 6. The switching unit 6 is used to control the first transistor Q1 to conduct according to the first level signal, and to conduct the second branch 52; the switching unit 6 is also used to control the first transistor Q1 to turn off according to the second level signal, and to turn off the second branch 52.

[0080] The second diode, Z2, can be a transient voltage suppressor (TVS), a semiconductor device used to protect the charging system from damage caused by transient voltages. When a momentary high voltage occurs in the charging system, the second diode Z2 can respond quickly, clamping the voltage within a safe range to prevent damage to the charging system, thus exhibiting high reliability.

[0081] Switching unit 6 is used to control the on / off state of the first transistor Q1 to achieve on / off control of the second branch 52. When the second voltage signal is less than the second preset threshold voltage, the control module 3 generates a first level signal, and the switching unit 6 controls the first transistor Q1 to conduct according to the first level signal, so that the second branch is conducted.

[0082] When the second voltage signal is equal to the second preset threshold voltage, the control module 3 generates a second level signal, and the switching unit 6 controls the first transistor Q1 to turn off according to the second level signal, so that the second branch is disconnected.

[0083] Figure 5 This is a schematic diagram of another charging system provided in an embodiment of the present invention, with reference to... Figure 5 Based on the above embodiments, optionally, the switching unit 6 includes: a first transistor T1 and a second transistor T2. The first terminal of the first transistor T1 is connected to the control terminal of the second transistor T2, the second terminal of the first transistor T1 is grounded, and the control terminal of the first transistor T1 is connected to the control module 6; the first transistor T1 is used to turn on according to a first level signal and also to turn off according to a second level signal. The first terminal of the second transistor T2 is connected to a power supply, and the second terminal of the second transistor T2 is connected to the control terminal of the first transistor Q1; the second transistor T2 is used to turn on when the first transistor T1 is on, and inputs the power supply voltage to the control terminal of the first transistor T1; the first transistor T1 is used to turn on according to the power supply voltage.

[0084] The first level signal can be a high level signal. The first transistor T1 can be turned on according to the high level signal. When the first transistor T1 is turned on, the control terminal of the second transistor T2 is grounded. The second transistor T2 can be turned on according to the low level. At this time, the power supply voltage can be input into the first transistor Q1 through the second transistor T2, so that the first transistor Q1 is turned on.

[0085] For example, the switching unit 6 may further include a sixth resistor R6 connected between the first terminal of the first transistor T1 and the control terminal of the second transistor T2, a seventh resistor R7 and an eighth resistor R8 connected in series between the second terminal of the second transistor T2 and the first terminal of the first transistor Q1, for limiting the current in the circuit. It also includes a third diode Z3 connected in parallel with the eighth resistor R8 to prevent reverse voltage input into the second branch 52.

[0086] This utility model embodiment also provides an autonomous operating device. The autonomous operating device includes an infrared receiving module. The autonomous operating device is charged by the charging system provided in any embodiment of this utility model, and the charging status of the autonomous operating device is detected by the detection circuit provided in any embodiment of this utility model.

[0087] For example, the autonomous operating device can be a device to be charged, which may include a lawnmower. The charging system is used to charge the lawnmower, and the charging status of the lawnmower is detected by a detection circuit.

[0088] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0089] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A detection circuit, characterized in that, include: A detection interface is used to connect to a charging interface, which is used to connect to a device to be charged via a first port and a second port. In the pile detection module, connected to the first port of the charging interface, it is used to output a first voltage signal according to the voltage of the first port of the charging interface; A control module, connected to the on-pile detection module, is used to determine the connection status between the device to be charged and the charging interface based on the difference between the first voltage signal and the first preset threshold voltage.

2. The detection circuit according to claim 1, characterized in that, The on-pile detection module includes: a first resistor and a first diode; The first resistor is connected between the first port of the charging interface and the control module to limit the current input to the control module; The first diode is connected in parallel between the first resistor and the ground terminal to limit the voltage of the first voltage signal and input the processed first voltage signal into the control module. The control module is used to determine that the device to be charged and the charging interface are connected when the processed first voltage signal is equal to the first preset threshold voltage. The control module is also used to determine that the device to be charged is disconnected from the charging interface when the processed first voltage signal is less than the first preset threshold voltage.

3. The detection circuit according to claim 1, characterized in that, The detection circuit further includes: A voltage detection module is connected to the second port of the charging interface and the control module. The voltage detection module is used to collect the voltage of the second port of the charging interface and generate a second voltage signal. The control module is used to determine the charging status of the device to be charged based on the difference between the second voltage signal and the second preset threshold; the second preset threshold is greater than the first preset threshold.

4. The detection circuit according to claim 3, characterized in that, The voltage detection module includes: a second resistor and a third resistor; The first end of the second resistor is connected to the second port of the charging interface, the second end of the second resistor is connected to the first end of the third resistor, and the second end of the third resistor is connected to the ground terminal; the second end of the second resistor is also connected to the control module. The second resistor and the third resistor are used to divide the voltage at the second port of the charging interface and generate the second voltage signal.

5. The detection circuit according to claim 1, characterized in that, The device to be charged includes an infrared receiving module, which is communicatively connected to an infrared transmitting module, and the infrared transmitting module is connected to the control module. The control module is used to determine that the device to be charged and the charging interface are connected when the first voltage signal is equal to the first preset threshold voltage, and to control the infrared emitting module to turn off. The control module is used to determine that the device to be charged is disconnected from the charging interface when the first voltage signal is less than the first preset threshold voltage, and to control the infrared emitting module to turn on.

6. A charging system, characterized in that, include: The detection circuit according to any one of claims 1-5; The charging system further includes: a first branch and a second branch; The first branch is used to limit the transient voltage in the charging system during the first power-on phase; the first power-on phase is the initial power-on phase; The second branch is used to turn on during the second power-on phase and short-circuit the first branch; the first power-on phase precedes the second power-on phase.

7. The charging system according to claim 6, characterized in that, The charging system further includes a switching unit connected between the second branch and the control module of the detection circuit; The control module is used to generate a first level signal when the second voltage signal is less than a second preset threshold voltage, and the switching unit controls the second branch to be turned on according to the first level signal; The control module is used to generate a second level signal when the second voltage signal is equal to the second preset threshold voltage, and the switching unit controls the second branch to disconnect according to the second level signal.

8. The charging system according to claim 7, characterized in that, The first branch includes: a second diode, the positive terminal of the second diode being connected to the first port of the charging interface, and the negative terminal of the second diode being grounded; The second branch includes: a first transistor, the first terminal of which is connected to the first port of the charging interface, the second terminal of which is grounded, and the control terminal of which is connected to the switching unit; The switching unit is used to control the first transistor to turn on according to the first level signal and to turn on the second branch; the switching unit is also used to control the first transistor to turn off according to the second level signal and to turn off the second branch.

9. The charging system according to claim 8, characterized in that, The switching unit includes: a first transistor and a second transistor; The first terminal of the first transistor is connected to the control terminal of the second transistor, the second terminal of the first transistor is grounded, and the control terminal of the first transistor is connected to the control module; the first transistor is used to turn on according to the first level signal and also to turn off according to the second level signal; The first end of the second transistor is connected to the power supply, and the second end of the second transistor is connected to the control terminal of the first transistor; the second transistor is used to conduct when the first transistor is turned on, and input the power supply voltage to the control terminal of the first transistor; the first transistor is used to conduct according to the power supply voltage.

10. An autonomous operating device, characterized in that, include: Infrared receiver module; The autonomous operating device is charged by the charging system according to any one of claims 6-9, and the charging status of the autonomous operating device is detected by the detection circuit according to any one of claims 1-5.

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