Load overcurrent protection self-locking circuit, overcurrent protection device and robot

Abstract

The utility model belongs to the technical field of overcurrent protection, and provides a load overcurrent protection self-locking circuit, an overcurrent protection device and a robot. A load switch module is connected between a power supply end and a load end, and an overcurrent protection trigger module is connected in series with the load switch module; and the overcurrent protection trigger module generates an overcurrent protection trigger signal when the current between the power supply end and the load end reaches an overcurrent threshold value. The over-current protection self-locking module controls the over-current protection trigger module to continuously output the over-current protection trigger signal under the condition that the power supply end is powered on according to the over-current protection trigger signal, and the switch control module controls the load switch module to be turned off according to the over-current protection trigger signal. Therefore, the self-locking function is started to power off the load end under the condition that the load current is over-current, power supply can be recovered only when the load is powered off and restarted, and the purpose of protecting the load is achieved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of overcurrent protection, and particularly relates to a load overcurrent protection self-locking circuit, an overcurrent protection device and a robot. BACKGROUND

[0002] In a direct-current communication power supply system, a load overcurrent protector needs to be configured for overcurrent or short-circuit protection of load output, and the load overcurrent protection device is usually selected from air switches and fuses; the state of the load overcurrent protector is very crucial for maintenance of the communication power supply system and is an indispensable detection content in power supply system monitoring.

[0003] However, in the related circuit, when the current in the circuit is too large, the load is usually disconnected at high current for protection, and there is a problem of complex reset when the load is powered on again. CONTENT OF THE UTILITY MODEL

[0004] To solve the above technical problems, the application embodiments provide a load overcurrent protection self-locking circuit, an overcurrent protection device and a robot, aiming to solve the problem of complex reset of the current protection scheme in the related circuit.

[0005] The first aspect of the application embodiments provides a load overcurrent protection self-locking circuit, which comprises:

[0006] a load switch module connected between a power supply end and a load end;

[0007] an overcurrent protection trigger module connected in series with the load switch module and configured to generate an overcurrent protection trigger signal when the current between the power supply end and the load end reaches an overcurrent threshold;

[0008] an overcurrent protection self-locking module connected with the overcurrent protection trigger module, configured to receive the overcurrent protection trigger signal and control the overcurrent protection trigger module to continuously output the overcurrent protection trigger signal in the case of power-on of the power supply end according to the overcurrent protection trigger signal;

[0009] a switch control module connected with the overcurrent protection trigger module and configured to control the load switch module to be turned off according to the overcurrent protection trigger signal.

[0010] In some embodiments, the load overcurrent protection self-locking circuit further comprises:

[0011] a master control module connected with the switch control module and configured to provide a switch control signal to the switch control module;

[0012] The switch control module is further configured to control the switch state of the load switch module according to the overcurrent protection trigger signal and the switch control signal.

[0013] In some embodiments, the over-current protection self-locking module is further configured to stop outputting the over-current protection trigger signal when the power supply end is powered on again after power-off.

[0014] In some embodiments, the switch control module comprises:

[0015] a switch driving unit, connected with the power supply end and the master control module, configured to control the load switch module to be off when the power supply end is powered on, and control the switch state of the load switch module according to the switch control signal.

[0016] In some embodiments, the switch control module further comprises:

[0017] an off output unit, connected with the over-current protection trigger module and the switch driving unit, configured to generate an off output control signal according to the over-current protection trigger signal;

[0018] the switch driving unit controls the load switch module to be off according to the off output control signal.

[0019] In some embodiments, the over-current protection trigger module comprises:

[0020] a first resistance unit, connected in series with the load switch module;

[0021] a first voltage dividing unit, connected in parallel with the first resistance unit and connected with the power supply end, configured to divide the voltage across the first resistance unit, and generate a first over-current trigger signal when the current between the power supply end and the load end reaches an over-current threshold;

[0022] a first switch unit, connected with the first voltage dividing unit, configured to generate the over-current protection trigger signal according to the first over-current trigger signal.

[0023] In some embodiments, the resistance value of the first voltage dividing unit is greater than the resistance value of the first resistance unit.

[0024] In some embodiments, the over-current protection self-locking module comprises:

[0025] a first current limiting unit, connected with the first switch unit, configured to limit the current output by the first switch unit;

[0026] a second switch unit, connected with the first current limiting unit and the first voltage dividing unit, configured to control the first voltage dividing unit to continuously output the first over-current trigger signal when the power supply end is powered on according to the over-current protection trigger signal.

[0027] The second aspect of the embodiment of the present application further provides a load overcurrent protection self-locking circuit.

[0028] The third aspect of the embodiment of the present application further provides a robot, comprising a motor and the load overcurrent protection self-locking circuit according to any one of the above embodiments, wherein the motor is connected to the load end.

[0029] The embodiment of the present application has the following beneficial effects: the load switch module is connected between the power supply end and the load end, and the overcurrent protection trigger module and the load switch module are connected in series, and the overcurrent protection trigger module generates an overcurrent protection trigger signal when the current between the power supply end and the load end reaches an overcurrent threshold. The overcurrent protection self-locking module controls the overcurrent protection trigger module to continuously output the overcurrent protection trigger signal in the case of power-on of the power supply end according to the overcurrent protection trigger signal, and the load switch module is controlled to be turned off by the switch control module according to the overcurrent protection trigger signal, so that the self-locking function is started to cut off the power supply of the load end in the case of overcurrent of the load current, and the power supply needs to be cut off and restarted to restore the power supply, thereby achieving the purpose of protecting the load. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a circuit structure schematic of a load overcurrent protection self-locking circuit provided by an embodiment of the present application Figure 1 .

[0031] Figure 2 is a circuit structure schematic of a load overcurrent protection self-locking circuit provided by an embodiment of the present application Figure 2 .

[0032] Figure 3 is a circuit structure schematic of a load overcurrent protection self-locking circuit provided by an embodiment of the present application Figure 3 .

[0033] Figure 4 is a circuit structure schematic of a load overcurrent protection self-locking circuit provided by an embodiment of the present application Figure 4 .

[0034] Figure 5 is a circuit structure schematic of a load overcurrent protection self-locking circuit provided by an embodiment of the present application Figure 5 .

[0035] Figure 6 is a circuit structure schematic of a load overcurrent protection self-locking circuit provided by an embodiment of the present application Figure 6 . DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0037] It should be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0038] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0039] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is one or more than one, unless otherwise explicitly and specifically limited.

[0040] In related circuits, when the current in the circuit is too large, the load is usually disconnected at high current to protect, and there is a complex problem of resetting when the load is powered on again.

[0041] In order to solve the above technical problems, the present application provides a load overcurrent protection self-locking circuit, see Figure 1As shown, the load overcurrent protection self-locking circuit in the embodiment of the present application comprises: a load switch module 500, an overcurrent protection triggering module 200, an overcurrent protection self-locking module 300, and a switch control module 400. The load switch module 500 is connected between the power supply end 110 and the load end 120. The overcurrent protection triggering module 200 is connected in series with the load switch module 500. The overcurrent protection triggering module 200 is configured to generate an overcurrent protection triggering signal when the current between the power supply end 110 and the load end 120 reaches an overcurrent threshold. The overcurrent protection self-locking module 300 is connected with the overcurrent protection triggering module 200. The overcurrent protection self-locking module 300 is configured to receive the overcurrent protection triggering signal and control the overcurrent protection triggering module 200 to continuously output the overcurrent protection triggering signal in the case that the power supply end 110 is powered on according to the overcurrent protection triggering signal. The switch control module 400 is connected with the overcurrent protection triggering module 200. The switch control module 400 is configured to control the load switch module 500 to be turned off according to the overcurrent protection triggering signal.

[0042] In the embodiment, the load switch module 500 is connected between the power supply end 110 and the load end 120, and the overcurrent protection triggering module 200 is connected in series with the load switch module 500. The overcurrent protection triggering module 200 generates an overcurrent protection triggering signal when the current between the power supply end 110 and the load end 120 reaches an overcurrent threshold. The overcurrent protection self-locking module 300 controls the overcurrent protection triggering module 200 to continuously output the overcurrent protection triggering signal in the case that the power supply end 110 is powered on according to the overcurrent protection triggering signal. The switch control module 400 controls the load switch module 500 to be turned off according to the overcurrent protection triggering signal, so as to start the self-locking function to power off the load end 120 in the case that the load current overflows, and the power supply end 110 needs to be powered on again to restore the power supply. This avoids the current of the power supply end 110 from fluctuating to cause the current of the load end 120 to frequently mutate, and achieves the purpose of protecting the load.

[0043] In some embodiments, referring to Figure 2 As shown, the load overcurrent protection self-locking circuit further comprises a master control module 600. The master control module 600 is connected with the switch control module 400. The master control module 600 is configured to provide a switch control signal to the switch control module 400. The switch control module 400 is further configured to control the switch state of the load switch module 500 according to the overcurrent protection triggering signal and the switch control signal.

[0044] In the embodiment, the main control module 600 provides a corresponding switch control signal to the switch control module 400, the switch control module 400 generates a corresponding switch driving signal according to the switch control signal, and the switch driving signal is output to the control end of the load switch module 500. The load switch module 500 can be turned on or turned off according to the level of the switch driving signal. For example, in the case of a high-level switch driving signal, the control end of the load switch module 500 is high, and the load switch module 500 is turned off. In the case of a low-level switch driving signal, the control end of the load switch module 500 is low, and the load switch module 500 is turned on.

[0045] In some embodiments, the overcurrent protection self-locking module 300 is also used to stop outputting the overcurrent protection trigger signal when the power supply end 110 is powered on again after power failure.

[0046] In the embodiment, in the case of overcurrent of the load current, the overcurrent protection trigger module 200 generates an overcurrent protection trigger signal, and the overcurrent protection self-locking module 300 locks the working state of the overcurrent protection trigger module 200 according to the overcurrent protection trigger signal, so that the overcurrent protection trigger module 200 continuously outputs the overcurrent protection trigger signal. In this way, a self-locking loop is formed. Only when the power supply end 110 is powered off, the overcurrent protection trigger module 200 will stop outputting the overcurrent protection trigger signal. At this time, the self-locking loop is unlocked, and the overcurrent protection trigger module 200 will only generate an overcurrent protection trigger signal when the current between the power supply end 110 and the load end 120 reaches the overcurrent threshold value next time.

[0047] In some embodiments, as shown in Figure 3 The switch control module 400 includes a switch driving unit 410, which is connected with the power supply end 110 and the main control module 600. The switch driving unit 410 is used to control the load switch module 500 to be turned off when the power supply end 110 is powered on, and to control the switch state of the load switch module 500 according to the switch control signal.

[0048] In the embodiment, the switch driving unit 410 is controlled by the power supply end 110 and the main control module 600, and can control the level of the control end of the load switch module 500, so as to achieve the purpose of controlling the switch state of the load switch module 500.

[0049] In some embodiments, as shown in Figure 3 The switch control module 400 further includes a turn-off output unit 420, which is connected with the overcurrent protection trigger module 200 and the switch driving unit 410. The turn-off output unit 420 is used to generate a turn-off output control signal according to the overcurrent protection trigger signal. The switch driving unit 410 controls the load switch module 500 to be turned off according to the turn-off output control signal.

[0050] In the embodiment, the off output unit 420 controls the level of the control end of the switch driving unit 410 according to the level of the output end OCP of the overcurrent protection trigger module 200, at this time, the level of the control end of the switch driving unit 410 is controlled by the master control module 600 and the off output unit 420 at the same time, in the case that the overcurrent protection trigger module 200 does not output the overcurrent protection trigger signal, the off output unit 420 has no effect on the level of the control end of the switch driving unit 410, in the case that the overcurrent protection trigger module 200 outputs the overcurrent protection trigger signal, the off output unit 420 controls the level of the control end of the switch driving unit 410, so that the switch driving unit 410 controls the load switch module 500 to be off. For example, in the case that the overcurrent protection trigger module 200 outputs the overcurrent protection trigger signal, the off output unit 420 generates the off output control signal according to the overcurrent protection trigger signal to pull down the level of the control end of the switch driving unit 410, at this time, no matter whether the output of the switch control signal of the master control module 600 is high level or low level, the level of the control end of the switch driving unit 410 is low, so that the level of the control end of the load switch module 500 is pulled high, so that the load switch module 500 works in the off state, and the purpose of overcurrent protection is achieved.

[0051] In some embodiments, referring to Figure 4 As shown in the figure, the overcurrent protection trigger module 200 includes a first resistance unit 210 and a first voltage division unit 220, a first switch unit 230, the first resistance unit 210 is connected in series with the load switch module 500; the first voltage division unit 220 is connected in parallel with the first resistance unit 210 and is connected with the power supply end 110, the first voltage division unit 220 is used for voltage division processing of the voltage across the first resistance unit 210, and generates a first overcurrent trigger signal when the current between the power supply end 110 and the load end 120 reaches an overcurrent threshold. The first switch unit 230 is connected with the first voltage division unit 220, and the first switch unit 230 is used for generating an overcurrent protection trigger signal according to the first overcurrent trigger signal.

[0052] In the embodiment, the two ends of the first voltage division unit 220 are respectively connected with the two ends of the first resistance unit 210, so that the voltage across the two ends of the first voltage division unit 220 is consistent with the voltage across the two ends of the first resistance unit 210, when the current flows through the first resistance unit 210, a corresponding voltage is generated across the two ends of the first resistance unit 210, the first voltage division unit 220 performs voltage division processing on the voltage across the two ends of the first resistance unit 210 to output a corresponding voltage division signal, when the current between the power supply end 110 and the load end 120 reaches the overcurrent threshold, the first voltage division unit 220 performs voltage division processing on the voltage across the two ends of the first resistance unit 210 to output the first overcurrent trigger signal, at this time, the first switch unit 230 is controlled by the first overcurrent trigger signal to generate the overcurrent protection trigger signal.

[0053] In some embodiments, the resistance of the first voltage dividing unit 220 is greater than the resistance of the first resistance unit 210.

[0054] In the embodiment, the resistance of the first voltage dividing unit 220 is greater than the resistance of the first resistance unit 210, so that the current mainly flows through the first resistance unit 210, and the power consumed by the first voltage dividing unit 220 is avoided to be too much.

[0055] In some embodiments, the resistance of the first voltage dividing unit 220 is at least 100 times of the resistance of the first resistance unit 210.

[0056] In some embodiments, referring to Figure 5 As shown, the overcurrent protection self-locking module 300 includes a first current limiting unit 310 and a second switch unit 320. The first current limiting unit 310 is connected with the first switch unit 230, and is configured to perform current limiting processing on the current output by the first switch unit 230. The second switch unit 320 is connected with the first current limiting unit 310 and the first voltage dividing unit 220, and is configured to control the first voltage dividing unit 220 to continuously output the first overcurrent trigger signal according to the overcurrent protection trigger signal in the case that the power supply end 110 is powered on.

[0057] In the embodiment, the first current limiting unit 310 can perform current limiting processing on the current output by the first switch unit 230, or perform current limiting processing on the current flowing to the control end of the second switch unit 320, so as to avoid that the current output by the first switch unit 230 is too large to have a negative impact on the control end of the second switch unit 320 and the control end of the off output unit 420.

[0058] In some embodiments, referring to Figure 6 As shown, the first resistance unit 210 includes a first resistor R1. The first end of the first resistor R1 is connected with the power supply end 110, and the second end of the first resistor R1 is connected with the load switch module 500.

[0059] In the embodiment, the first resistor R1 can be used as a sampling resistor to sample the current between the power supply end 110 and the load switch module 500, and provide corresponding voltages for the two ends of the first voltage dividing unit 220.

[0060] In some embodiments, the resistance of the first resistor R1 can be 1 ohm, so as to reduce the resistance between the power supply end 110 and the load end 120, and reduce the energy loss of the power supply circuit.

[0061] In some embodiments, referring to Figure 6As shown, the first voltage dividing unit 220 includes a second resistor R2 and a third resistor R3, a first end of the second resistor R2 is connected to a first end of the first resistor R1, a second end of the second resistor R2 and a first end of the third resistor R3 are connected to a control end of the first switch unit 230, and a second end of the third resistor R3 is connected to a second end of the first resistor R1.

[0062] In the embodiment, the second resistor R2 and the third resistor R3 form a voltage dividing circuit, when a current flows through the first resistor unit 210, a corresponding voltage is generated between the two ends of the voltage dividing circuit, the voltage dividing circuit divides the voltage between the two ends of the first resistor unit 210 and outputs a corresponding voltage dividing signal, the voltage dividing signal depends not only on the voltage between the two ends of the first resistor unit 210, but also on the ratio of the second resistor R2 and the third resistor R3, the smaller the ratio of the second resistor R2 and the third resistor R3, the greater the voltage of the voltage dividing signal. When the current between the power supply end 110 and the load end 120 reaches the overcurrent threshold, the voltage dividing circuit divides the voltage between the two ends of the first resistor unit 210 and outputs a first overcurrent trigger signal, at this time, the first switch unit 230 is controlled by the first overcurrent trigger signal to generate an overcurrent protection trigger signal.

[0063] In some embodiments, the resistance ratio of the second resistor R2 and the third resistor R3 is adjustable, so that the overcurrent threshold between the power supply end 110 and the load end 120 can be adjusted.

[0064] In some embodiments, the resistance of the second resistor R2 and the third resistor R3 is at least 100 times that of the first resistor R1.

[0065] In some embodiments, the resistance of the second resistor R2 and the third resistor R3 is the same.

[0066] In some embodiments, referring to Figure 6 As shown, the first switch unit 230 includes a first switch tube Q1, a control end of the first switch tube Q1 is connected to a common node of the second resistor R2 and the third resistor R3, a first end of the first switch tube Q1 is connected to the power supply end 110, and a second end of the first switch tube Q1 is connected to the overcurrent protection self-locking module 300 and the switch control module 400, so that when the current between the power supply end 110 and the load end 120 reaches the overcurrent threshold, an overcurrent protection trigger signal is generated and output to the overcurrent protection self-locking module 300 and the switch control module 400.

[0067] In some embodiments, the first switch tube Q1 can be a PNP type triode or an N type MOS tube.

[0068] In some embodiments, referring to Figure 6As shown in the figure, the first current limiting unit 310 includes a fourth resistor R4 and a fifth resistor R5, the fourth resistor R4 is connected between the output terminal OCP of the overcurrent protection triggering module 200 and the second switch unit 320, the first end of the fifth resistor R5 is connected to the output terminal OCP of the overcurrent protection triggering module 200, and the second end of the fifth resistor R5 is grounded.

[0069] In some embodiments, referring to Figure 6 As shown in the figure, the second switch unit 320 includes a second switch tube Q2 and a sixth resistor R6, the first end of the sixth resistor R6 is connected to the first voltage dividing unit 220, the second end of the sixth resistor R6 is connected to the first end of the second switch tube Q2, the second end of the second switch tube Q2 is grounded, and the control end of the second switch tube Q2 is connected to the first current limiting unit 310.

[0070] In some embodiments, the second switch tube Q2 can be a PNP type triode or an N type MOS tube.

[0071] In some embodiments, referring to Figure 6 As shown in the figure, the off output unit 420 includes a seventh resistor R7, an eighth resistor R8 and a third switch tube Q3, the first end of the seventh resistor R7 is connected to the output terminal OCP of the overcurrent protection triggering module 200, the second end of the seventh resistor R7 and the first end of the eighth resistor R8 are connected to the control end of the third switch tube Q3, the second end of the eighth resistor R8 and the second end of the third switch tube Q3 are grounded, and the first end of the third switch tube Q3 is connected to the control end of the switch driving unit 410.

[0072] In the embodiment, the off output unit 420 controls the level of the control end of the switch driving unit 410 according to the level of the output terminal OCP of the overcurrent protection triggering module 200, at this time, the level of the control end of the switch driving unit 410 is controlled by the master control module 600 and the off output unit 420 at the same time, in the case that the overcurrent protection triggering module 200 does not output the overcurrent protection triggering signal, the off output unit 420 has no effect on the level of the control end of the switch driving unit 410, in the case that the overcurrent protection triggering module 200 outputs the overcurrent protection triggering signal, the off output unit 420 controls the level of the control end of the switch driving unit 410, so that the switch driving unit 410 controls the load switch module 500 to be off.

[0073] For example, when the overcurrent protection trigger module 200 outputs an overcurrent protection trigger signal, the seventh resistor R7 and the eighth resistor R8 form a voltage divider circuit to divide the overcurrent protection trigger signal. The voltage signal after voltage division controls the third switch Q3 to turn on, thereby generating a low-level shutdown output control signal to ground the control terminal of the switch drive unit 410. At this time, regardless of whether the switch control signal output by the main control module 600 is high or low, the level of the control terminal of the switch drive unit 410 is low. This causes the level of the control terminal of the load switch module 500 to go high, so that the load switch module 500 works in the shutdown state, achieving the purpose of overcurrent protection.

[0074] In some embodiments, the third switch Q3 can be a PNP transistor or an N-type MOSFET.

[0075] In some embodiments, see Figure 6 As shown, the switch drive unit 410 includes a ninth resistor R9, a tenth resistor R10, and a fourth switch Q4. The first end of the ninth resistor R9 and the control end of the fourth switch Q4 are both connected to the shutdown output unit 420. The first end of the fourth switch Q4 is connected to the first end of the tenth resistor R10. The second end of the tenth resistor R10 is connected to the control end of the load switch module 500. The second end of the fourth switch Q4 and the second end of the ninth resistor R9 are grounded.

[0076] In some embodiments, the fourth switch Q4 can be a PNP transistor or an N-type MOSFET.

[0077] In some embodiments, see Figure 6 As shown, the second end of the tenth resistor R10 can also be connected to the power supply terminal 110 via the eleventh resistor R11.

[0078] In some embodiments, the control terminal of the fourth switch Q4 can also be connected to the control terminal MCUSW of the main control module 600 via the twelfth resistor R12.

[0079] In some embodiments, the twelfth resistor R12 and the shutdown output unit 420 form an AND logic circuit. When the overcurrent protection trigger module 200 outputs an overcurrent protection trigger signal, the shutdown output unit 420 generates a shutdown output control signal based on the overcurrent protection trigger signal to pull the level of the control terminal of the switch drive unit 410 low. At this time, regardless of whether the switch control signal output by the main control module 600 is high or low, since the shutdown output control signal is low, the level of the control terminal of the switch drive unit 410 is low. This causes the level of the control terminal of the load switch module 500 to be pulled high, so that the load switch module 500 works in the shutdown state, thereby achieving the purpose of overcurrent protection.

[0080] In some embodiments, the load switch module 500 comprises a load switch tube T11, a gate of the load switch tube T11 is connected to the switch driving unit 410, a source of the load switch tube T11 is connected to the overcurrent protection triggering module 200, and a drain of the load switch tube T11 is connected to the load end 120.

[0081] In the embodiment, the load switch tube T11 can be a P-type MOS tube.

[0082] In combination ​ The working principle of the load overcurrent protection self-locking circuit is described as follows. The load switch tube T11 is a P-type MOS tube, the control end MCUSW of the master control module 600 is at a high level, the fourth switch tube Q4 is turned on, the gate voltage of the load switch tube T11 is pulled low, the load switch tube T11 is turned on, the control end MCUSW of the master control module 600 is at a low level, the fourth switch tube Q4 is turned off, the gate voltage of the load switch tube T11 is pulled high, and the load switch tube T11 is turned off. When the power supply end 110 is powered on, the high voltage of the power supply end 110 is output to the gate of the load switch tube T11 to make the load switch tube T11 turned off, and then the level of the control end of the load switch tube T11 is controlled by the level of the control end MCUSW of the master control module 600.

[0083] When the power supply end 110 is overcurrent, the voltage dividing circuit composed of the second resistor R2 and the third resistor R3 divides the voltage to make the first switch tube Q1 turned on, an overcurrent triggering signal is output to the node OCP, the level of the node OCP is at a high level, the second switch tube Q2 is turned on, and the second end of the third resistor R3 is grounded,

[0084] In this way, the voltage dividing signal generated by the voltage dividing circuit composed of the second resistor R2 and the third resistor R3 makes the first switch tube Q1 continuously turned on, and the level of the node OCP is continuously at a high level. The third switch tube Q3 is turned on according to the overcurrent triggering signal, the control end of the fourth switch tube Q4 is grounded, the level of the control end of the fourth switch tube Q4 is pulled low to a low level, the fourth switch tube Q4 is turned off, the gate of the load switch tube T11 is always at a high level, and the load switch tube T11 remains turned off. Only when the power supply end 110 is powered off, the first switch tube Q1 can be turned off again after being restarted.

[0085] The embodiment of the present application further provides an overcurrent protection device, which comprises the load overcurrent protection self-locking circuit according to any one of the above embodiments.

[0086] The embodiment of the present application further provides a robot, which comprises a motor and the load overcurrent protection self-locking circuit according to any one of the above embodiments, and the motor is connected to the load end 120.

[0087] The beneficial effects of the embodiments of the present application are as follows: the load switch module 500 is connected between the power supply end 110 and the load end 120, and the overcurrent protection triggering module 200 and the load switch module 500 are connected in series, and the overcurrent protection triggering module 200 generates an overcurrent protection triggering signal when the current between the power supply end 110 and the load end 120 reaches an overcurrent threshold. The overcurrent protection self-locking module 300 controls the overcurrent protection triggering module 200 to continuously output the overcurrent protection triggering signal in the case that the power supply end 110 is powered on according to the overcurrent protection triggering signal, and the load switch module 500 is controlled to be turned off according to the overcurrent protection triggering signal by the switch control module 400, so that the self-locking function is started to cut off the power supply of the load end 120 in the case that the load current overflows, and the power supply needs to be restarted to recover, so as to achieve the purpose of protecting the load.

[0088] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in a certain embodiment can be referred to the related description of other embodiments.

[0089] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A load overcurrent protection self-locking circuit, characterized by, The load overcurrent protection self-locking circuit comprises: a load switch module connected between a power supply end and a load end; an overcurrent protection trigger module connected in series with the load switch module, configured to generate an overcurrent protection trigger signal when a current between the power supply end and the load end reaches an overcurrent threshold; an overcurrent protection self-locking module connected with the overcurrent protection trigger module, configured to receive the overcurrent protection trigger signal and control the overcurrent protection trigger module to continuously output the overcurrent protection trigger signal in the case that the power supply end is powered on according to the overcurrent protection trigger signal; a switch control module connected with the overcurrent protection trigger module, configured to control the load switch module to be turned off according to the overcurrent protection trigger signal.

2. The load current protected self-locking circuit of claim 1, wherein, The load overcurrent protection self-locking circuit further comprises: a master control module connected with the switch control module, configured to provide a switch control signal to the switch control module; the switch control module is further configured to control a switch state of the load switch module according to the overcurrent protection trigger signal and the switch control signal.

3. The load current protected latch-up circuit of claim 1, wherein, The overcurrent protection self-locking module is further configured to stop outputting the overcurrent protection trigger signal when the power supply end is powered on again after being powered off.

4. The load current protected latch-up circuit of claim 2, wherein, The switch control module comprises: a switch driving unit connected with the power supply end and the master control module, configured to control the load switch module to be turned off when the power supply end is powered on, and control a switch state of the load switch module according to the switch control signal.

5. The load current foldback self-latching circuit of claim 4, wherein, The switch control module further comprises: a turn-off output unit connected with the overcurrent protection trigger module and the switch driving unit, configured to generate a turn-off output control signal according to the overcurrent protection trigger signal; the switch driving unit controls the load switch module to be turned off according to the turn-off output control signal.

6. The load current foldback self-latching circuit of any one of claims 1-5, wherein, The overcurrent protection trigger module comprises: a first resistance unit connected in series with the load switch module; a first voltage division unit connected in parallel with the first resistance unit and connected with the power supply end, configured to perform voltage division processing on a voltage across the first resistance unit, and generate a first overcurrent trigger signal when a current between the power supply end and the load end reaches an overcurrent threshold; a first switch unit connected with the first voltage division unit, configured to generate the overcurrent protection trigger signal according to the first overcurrent trigger signal.

7. The load current foldback self-latching circuit of claim 6 wherein, The first voltage division unit has a resistance value greater than that of the first resistance unit.

8. The load current foldback self-latching circuit of claim 6, wherein, The overcurrent protection self-locking module comprises: a first current limiting unit connected with the first switch unit, configured to perform current limiting processing on a current output by the first switch unit; a second switch unit connected with the first current limiting unit and the first voltage division unit, configured to control the first voltage division unit to continuously output the first overcurrent trigger signal in the case that the power supply end is powered on according to the overcurrent protection trigger signal.

9. An overcurrent protection device, characterized by The overcurrent protection device comprises the load overcurrent protection self-locking circuit according to any one of claims 1 to 8.

10. A robot, characterized in that The robot comprises a motor and the load overcurrent protection self-locking circuit according to any one of claims 1 to 8, wherein the motor is connected with the load end.

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