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

Abstract

The invention 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 present application belongs to the technical field of overcurrent protection, and in particular, relates to a load overcurrent protection self-locking circuit, an overcurrent protection device, and a robot. Background Art

[0002] In the DC communication power supply system, a load overcurrent protector needs to be configured for load output to provide overcurrent or short circuit protection. Load overcurrent protection devices are often circuit breakers, fuses, etc. The status of the load overcurrent protector is very critical for the maintenance of the communication power supply system and is an indispensable detection content in the power supply system monitoring.

[0003] However, in related circuits, when the current in the circuit is too large, the load is usually disconnected for protection at high current, and there is a problem of complex resetting when the load is powered on again. Summary of the invention

[0004] In order to solve the above technical problems, the embodiments of the present application provide a load overcurrent protection self-locking circuit, an overcurrent protection device, and a robot, which aim to solve the problem of complex reset of the current protection scheme in the relevant circuit.

[0005] A first aspect of an embodiment of the present application provides a load overcurrent protection self-locking circuit, the load overcurrent protection self-locking circuit comprising:

[0006] A load switch module is connected between the power supply end and the load end;

[0007] An overcurrent protection trigger module is connected in series with the load switch module and is used 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 to the overcurrent protection trigger module, for receiving the overcurrent protection trigger signal, and controlling the overcurrent protection trigger module to continuously output the overcurrent protection trigger signal when the power supply end is powered on according to the overcurrent protection trigger signal;

[0009] The switch control module is connected to the overcurrent protection trigger module and is used to control the load switch module to turn off according to the overcurrent protection trigger signal.

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

[0011] A main control module, connected to the switch control module, and used to provide a switch control signal to the switch control module;

[0012] The switch control module is further used 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 overcurrent protection self-locking module is further used to stop outputting the overcurrent protection trigger signal when the power supply end is powered on again after power failure.

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

[0015] The switch driving unit is connected to the power supply end and the main control module, and is used to control the load switch module to be turned off when the power supply end is powered on, and to control the switch state of the load switch module according to the switch control signal.

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

[0017] A shutdown output unit, connected to the overcurrent protection trigger module and the switch driving unit, and configured to generate a shutdown output control signal according to the overcurrent protection trigger signal;

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

[0019] In some embodiments, the overcurrent protection trigger module includes:

[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 to the power supply end, for performing voltage dividing processing on the voltage across the first resistance unit, and generating a first overcurrent trigger signal when the current between the power supply end and the load end reaches an overcurrent threshold;

[0022] A first switch unit is connected to the first voltage dividing unit, and is used to generate the overcurrent protection trigger signal according to the first overcurrent trigger signal.

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

[0024] In some embodiments, the overcurrent protection self-locking module includes:

[0025] a first current limiting unit, connected to the first switch unit, and configured to perform current limiting processing on a current output by the first switch unit;

[0026] A second switch unit is connected to the first current limiting unit and the first voltage dividing unit, and is used to control the first voltage dividing unit to continuously output the first overcurrent trigger signal when the power supply end is powered on according to the overcurrent protection trigger signal.

[0027] A second aspect of the embodiments of the present application further provides an overcurrent protection device, which includes a load overcurrent protection self-locking circuit as described in any one of the above embodiments.

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

[0029] The beneficial effects of the embodiments of the present application are as follows: by connecting the load switch module between the power supply end and the load end, and connecting the overcurrent protection trigger module in series with the load switch module, the overcurrent protection trigger module generates an overcurrent protection trigger signal when the current between the power supply end and the load end reaches the overcurrent threshold. The overcurrent protection self-locking module controls the overcurrent protection trigger module to continuously output the overcurrent protection trigger signal when the power supply end is powered on according to the overcurrent protection trigger signal, and the switch control module controls the load switch module to shut down according to the overcurrent protection trigger signal, so that the self-locking function is activated to cut off the power to the load end when the load current is overcurrent, and the power supply needs to be restored by powering off and restarting, thereby achieving the purpose of protecting the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The circuit structure of the load overcurrent protection self-locking circuit provided by an embodiment of the present application is shown in FIG. Figure 1 ;

[0031] Figure 2 The circuit structure of the load overcurrent protection self-locking circuit provided by an embodiment of the present application is shown in FIG. Figure 2 ;

[0032] Figure 3 The circuit structure of the load overcurrent protection self-locking circuit provided by an embodiment of the present application is shown in FIG. Figure 3 ;

[0033] Figure 4 The circuit structure of the load overcurrent protection self-locking circuit provided by an embodiment of the present application is shown in FIG. Figure 4 ;

[0034] Figure 5 The circuit structure of the load overcurrent protection self-locking circuit provided by an embodiment of the present application is shown in FIG. Figure 5 ;

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

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is 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 are not used to limit the present application.

[0037] It should be noted that when an element is referred to as being "fixed to" 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 orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means one or more, unless otherwise clearly and specifically defined.

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

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

[0042] In this embodiment, the load switch module 500 is connected between the power supply end 110 and the load end 120, and the overcurrent protection trigger module 200 is connected in series with the load switch module 500, and the overcurrent protection trigger module 200 generates an overcurrent protection trigger signal when the current between the power supply end 110 and the load end 120 reaches the overcurrent threshold. The overcurrent protection self-locking module 300 controls the overcurrent protection trigger module 200 to continuously output the overcurrent protection trigger signal when the power supply end 110 is powered on according to the overcurrent protection trigger signal, and the switch control module 400 controls the load switch module 500 to turn off according to the overcurrent protection trigger signal, so that the self-locking function is activated to cut off the power to the load end 120 when the load current is overcurrent, and the power supply needs to be restored after the power is cut off and restarted, so as to avoid the current fluctuation of the power supply end 110 causing the current of the load end 120 to frequently change, thereby achieving the purpose of protecting the load.

[0043] In some embodiments, see Figure 2 As shown, the load overcurrent protection self-locking circuit also includes a main control module 600, which is connected to the switch control module 400. The main control module 600 is used to provide a switch control signal to the switch control module 400; the switch control module 400 is also used to control the switch state of the load switch module 500 according to the overcurrent protection trigger signal and the switch control signal.

[0044] In this embodiment, the main control module 600 provides a corresponding switch control signal to the switch control module 400, and the switch control module 400 generates a corresponding switch drive signal according to the switch control signal. The switch drive signal is output to the control end of the load switch module 500, and the load switch module 500 can be turned on or off according to the level of the switch drive signal. For example, when the switch drive signal is at a high level, the control end of the load switch module 500 is at a high level, and the load switch module 500 is turned off. When the switch drive signal is at a low level, the control end of the load switch module 500 is at a low level, 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 this embodiment, when the load current is overcurrent, 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 continues to output the overcurrent protection trigger signal. In this way, a self-locking loop is formed. Only when the power supply end 110 loses power, 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 generate an overcurrent protection trigger signal only when the current between the power supply end 110 and the load end 120 reaches the overcurrent threshold next time.

[0047] In some embodiments, see Figure 3 As shown, the switch control module 400 includes a switch driving unit 410, which is connected to 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 control the switching state of the load switch module 500 according to the switch control signal.

[0048] In this 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 , thereby achieving the purpose of controlling the switch state of the load switch module 500 .

[0049] In some embodiments, see Figure 3 As shown, the switch control module 400 also includes a shutdown output unit 420, which is connected to the overcurrent protection trigger module 200 and the switch drive unit 410. The shutdown output unit 420 is used to generate a shutdown output control signal according to the overcurrent protection trigger signal; the switch drive unit 410 controls the load switch module 500 to shut down according to the shutdown output control signal.

[0050] In this embodiment, the shutdown 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 main control module 600 and the shutdown output unit 420 at the same time. When the overcurrent protection trigger module 200 does not output the overcurrent protection trigger signal, the shutdown output unit 420 has no effect on the level of the control end of the switch driving unit 410. When the overcurrent protection trigger module 200 outputs the overcurrent protection trigger signal, the shutdown 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 shut down. For example, when the overcurrent protection trigger module 200 outputs an overcurrent protection trigger signal, the shutdown output unit 420 generates a shutdown output control signal according to the overcurrent protection trigger signal to lower the level of the control end of the switch driving unit 410. At this time, no matter whether the switch control signal output by the main control module 600 is high or low, 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 up, so that the load switch module 500 works in the shutdown state, thereby achieving the purpose of overcurrent protection.

[0051] In some embodiments, see Figure 4 As shown, the overcurrent protection trigger module 200 includes a first resistor unit 210, a first voltage divider unit 220, and a first switch unit 230. The first resistor unit 210 is connected in series with the load switch module 500. The first voltage divider unit 220 is connected in parallel with the first resistor unit 210 and connected to the power supply terminal 110. The first voltage divider unit 220 is used to divide the voltage across the first resistor unit 210 and generate a first overcurrent trigger signal when the current between the power supply terminal 110 and the load terminal 120 reaches the overcurrent threshold. The first switch unit 230 is connected to the first voltage divider unit 220, and the first switch unit 230 is used to generate an overcurrent protection trigger signal according to the first overcurrent trigger signal.

[0052] In this embodiment, the two ends of the first voltage divider unit 220 are respectively connected to the two ends of the first resistor unit 210, so that the voltage at the two ends of the first voltage divider unit 220 is consistent with the voltage at the two ends of the first resistor unit 210. When current flows through the first resistor unit 210, a corresponding voltage is generated at the two ends of the first resistor unit 210. The first voltage divider unit 220 divides the voltage at the two ends of the first resistor unit 210 and outputs a corresponding voltage divider signal. When the current between the power supply end 110 and the load end 120 reaches the overcurrent threshold, the first voltage divider unit 220 divides the voltage at 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.

[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 this 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 , thereby preventing the first voltage dividing unit 220 from consuming too much power.

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

[0056] In some embodiments, see 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 to the first switch unit 230, and the first current limiting unit 310 is used to limit the current output by the first switch unit 230; the second switch unit 320 is connected to the first current limiting unit 310 and the first voltage divider unit 220, and the second switch unit 320 is used to control the first voltage divider unit 220 to continuously output the first overcurrent trigger signal when the power supply end 110 is powered on according to the overcurrent protection trigger signal.

[0057] In this embodiment, the first current limiting unit 310 can limit the current output by the first switch unit 230, and can also limit the current flowing to the control end of the second switch unit 320, so as to avoid the current output by the first switch unit 230 being too large and having a negative impact on the control end of the second switch unit 320 and the shutdown output unit 420.

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

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

[0060] In some embodiments, the resistance of the first resistor R1 may be 1 ohm, so that the resistance between the power supply terminal 110 and the load terminal 120 can be reduced, thereby reducing the energy loss of the power supply line.

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

[0062] In this embodiment, the second resistor R2 and the third resistor R3 form a voltage divider circuit. When current flows through the first resistor unit 210, a corresponding voltage is generated at both ends of the voltage divider circuit. The voltage divider circuit divides the voltage at both ends of the first resistor unit 210 and outputs a corresponding voltage divider signal. The voltage divider signal depends not only on the voltage at both ends of the first resistor unit 210, but also on the ratio of the second resistor R2 to the third resistor R3. The smaller the ratio of the second resistor R2 to the third resistor R3, the greater the voltage of the voltage divider signal. When the current between the power terminal and the load terminal 120 reaches the overcurrent threshold, the voltage divider circuit divides the voltage at both 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 to the third resistor R3 is adjustable, so that the overcurrent threshold between the power supply terminal 110 and the load terminal 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 second resistor R2 and the third resistor R3 have the same resistance value.

[0066] In some embodiments, see Figure 6 As shown, the first switch unit 230 includes a first switch tube Q1, the control end of the first switch tube Q1 is connected to the common node of the second resistor R2 and the third resistor R3, the first end of the first switch tube Q1 is connected to the power supply end 110, and the 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 may be a PNP transistor or an N-type MOS tube.

[0068] In some embodiments, see Figure 6As shown, 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 end OCP of the overcurrent protection trigger module 200 and the second switch unit 320, the first end of the fifth resistor R5 is connected to the output end OCP of the overcurrent protection trigger module 200, and the second end of the fifth resistor R5 is grounded.

[0069] In some embodiments, see Figure 6 As shown, 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 may be a PNP transistor or an N-type MOS tube.

[0071] In some embodiments, see Figure 6 As shown, the shutdown 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 end OCP of the overcurrent protection trigger module 200, the second end of the seventh resistor R7 and the first end of the eighth resistor R8 are commonly 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 this embodiment, the shutdown 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 main control module 600 and the shutdown output unit 420 at the same time. When the overcurrent protection trigger module 200 does not output the overcurrent protection trigger signal, the shutdown output unit 420 has no effect on the level of the control end of the switch driving unit 410. When the overcurrent protection trigger module 200 outputs the overcurrent protection trigger signal, the shutdown 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 shut down.

[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 perform voltage division processing on the overcurrent protection trigger signal. The divided voltage signal controls the third switch tube Q3 to turn on, thereby generating a low-level shutdown output control signal to ground the control end of the switch drive unit 410. At this time, no matter whether the switch control signal output by the main control module 600 is high or low, the level of the control end of the switch drive unit 410 is low, so that the level of the control end of the load switch module 500 is pulled up, so that the load switch module 500 works in the shutdown state, thereby achieving the purpose of overcurrent protection.

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

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

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

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

[0078] In some embodiments, the control end of the fourth switch tube Q4 may also be connected to the control end MCUSW of the main control module 600 via a 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 according to the overcurrent protection trigger signal to lower the level of the control end of the switch driving unit 410. At this time, no matter 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 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 up, so that the load switch module 500 operates in the shutdown state, thereby achieving the purpose of overcurrent protection.

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

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

[0082] Combination Figure 6 The working principle of the load overcurrent protection self-locking circuit is explained. The load switch tube T11 is a P-type MOS tube. The control terminal MCUSW of the main control module 600 is at a high level. The fourth switch tube Q4 is turned on, and the gate voltage of the load switch tube T11 is pulled down. The load switch tube T11 is turned on, and the control terminal MCUSW of the main control module 600 is at a low level. The fourth switch tube Q4 is turned off, and the gate voltage of the load switch tube T11 is pulled up, and the load switch tube T11 is turned off. When the power supply terminal 110 is powered on, the high voltage of the power supply terminal 110 is output to the gate of the load switch tube T11, so that the load switch tube T11 is turned off, and then the level of the control terminal of the load switch tube T11 is controlled by the level of the control terminal MCUSW of the main control module 600.

[0083] When the power supply terminal 110 is overcurrent, the voltage divider circuit composed of the second resistor R2 and the third resistor R3 divides the voltage so that the first switch tube Q1 is turned on, and an overcurrent trigger signal is output to the node OCP. The level of the node OCP is high, so that the second switch tube Q2 is turned on, thereby grounding the second end of the third resistor R3.

[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 causes the first switch tube Q1 to be 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 trigger signal, and the control end of the fourth switch tube Q4 is grounded, and the level of the control end of the fourth switch tube Q4 is pulled down to a low level, and the fourth switch tube Q4 is turned off, so that 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 shut down and restarted can the first switch tube Q1 be turned off again.

[0085] An embodiment of the present application also provides an overcurrent protection device, which includes a load overcurrent protection self-locking circuit as described in any one of the above embodiments.

[0086] An embodiment of the present application further provides a robot, comprising: a motor, and a load overcurrent protection self-locking circuit as in any one of the above embodiments, wherein the motor is connected to a load terminal 120 .

[0087] The beneficial effects of the embodiments of the present application are as follows: by connecting the load switch module 500 between the power supply terminal 110 and the load terminal 120, and connecting the overcurrent protection trigger module 200 in series with the load switch module 500, the overcurrent protection trigger module 200 generates an overcurrent protection trigger signal when the current between the power supply terminal 110 and the load terminal 120 reaches the overcurrent threshold. The overcurrent protection self-locking module 300 controls the overcurrent protection trigger module 200 to continuously output the overcurrent protection trigger signal when the power supply terminal 110 is powered on according to the overcurrent protection trigger signal, and the switch control module 400 controls the load switch module 500 to turn off according to the overcurrent protection trigger signal, so that when the load current is overcurrent, the self-locking function is activated to cut off the power to the load terminal 120, and the power supply needs to be restored after the power is cut off and restarted, so as to achieve the purpose of protecting the load.

[0088] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0089] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A load overcurrent protection self-locking circuit, characterized in that: The load overcurrent protection self-locking circuit comprises: A load switch module is connected between the power supply end and the load end; An overcurrent protection trigger module is connected in series with the load switch module and is used to generate an overcurrent protection trigger signal when the current between the power supply end and the load end reaches an overcurrent threshold; An overcurrent protection self-locking module, connected to the overcurrent protection trigger module, for receiving the overcurrent protection trigger signal, and controlling the overcurrent protection trigger module to continuously output the overcurrent protection trigger signal when the power supply end is powered on according to the overcurrent protection trigger signal; The switch control module is connected to the overcurrent protection trigger module and is used to control the load switch module to turn off according to the overcurrent protection trigger signal.

2. The load overcurrent protection self-locking circuit according to claim 1, characterized in that: The load overcurrent protection self-locking circuit also includes: A main control module, connected to the switch control module, and used to provide a switch control signal to the switch control module; The switch control module is further used to control the switch state of the load switch module according to the overcurrent protection trigger signal and the switch control signal.

3. The load overcurrent protection self-locking circuit according to claim 1, characterized in that: The overcurrent protection self-locking module is also used to stop outputting the overcurrent protection trigger signal when the power supply end is powered on again after power failure.

4. The load overcurrent protection self-locking circuit according to claim 2, characterized in that: The switch control module comprises: The switch driving unit is connected to the power supply end and the main control module, and is used to control the load switch module to be turned off when the power supply end is powered on, and to control the switch state of the load switch module according to the switch control signal.

5. The load overcurrent protection self-locking circuit according to claim 4, characterized in that: The switch control module further includes: A shutdown output unit, connected to the overcurrent protection trigger module and the switch driving unit, and configured to generate a shutdown output control signal according to the overcurrent protection trigger signal; The switch driving unit controls the load switch module to turn off according to the shutdown output control signal.

6. The load overcurrent protection self-locking circuit according to any one of claims 1 to 5, characterized in that: The overcurrent protection trigger module includes: A first resistance unit, connected in series with the load switch module; a first voltage dividing unit, connected in parallel with the first resistance unit and connected to the power supply end, for performing voltage dividing processing on the voltage across the first resistance unit, and generating a first overcurrent trigger signal when the current between the power supply end and the load end reaches an overcurrent threshold; A first switch unit is connected to the first voltage dividing unit, and is used to generate the overcurrent protection trigger signal according to the first overcurrent trigger signal.

7. The load overcurrent protection self-locking circuit according to claim 6, characterized in that: The resistance value of the first voltage dividing unit is greater than the resistance value of the first resistance unit.

8. The load overcurrent protection self-locking circuit according to claim 6, characterized in that: The overcurrent protection self-locking module comprises: a first current limiting unit, connected to the first switch unit, and configured to perform current limiting processing on a current output by the first switch unit; A second switch unit is connected to the first current limiting unit and the first voltage dividing unit, and is used to control the first voltage dividing unit to continuously output the first overcurrent trigger signal when the power supply end is powered on according to the overcurrent protection trigger signal.

9. An overcurrent protection device, characterized in that: The overcurrent protection device comprises a load overcurrent protection self-locking circuit as described in any one of claims 1 to 8.

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

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