Power supply circuit and autonomous mobile device

Abstract

The utility model provides a power supply circuit and an autonomous mobile device. The power supply circuit comprises a DC power supply; the first end of the first resistor is connected to the positive electrode of the direct-current power supply, and the second end of the first resistor is used for being connected to a load; the first end of the switching tube is connected to the first end of the first resistor, and the second end of the switching tube is connected to the second end of the first resistor; the first end of the sampling circuit is connected to the second end of the first resistor, and the second end of the sampling circuit is connected to the control end of the switching tube and the positive electrode of the direct-current power supply; wherein the sampling circuit is used for collecting the voltage value of the second end of the first resistor and controlling the switch tube to be switched on under the condition that the voltage value of the second end of the first resistor reaches a first voltage value. According to the power supply circuit provided by the utility model, the switch tube does not need to be driven by an auxiliary power supply, thereby reducing the size of the power supply circuit, and facilitating the miniaturization design of the power supply circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a power supply circuit and an autonomous mobile device. Background Art

[0002] In recent years, autonomous mobile devices such as autonomous mobile robots (AMR) or automated guided vehicles (AGV) have been widely used in various scenarios, such as smart logistics and warehousing, due to their autonomy and high efficiency. In the technology related to autonomous mobile devices, when a low-voltage DC power supply is supplying power to a load, especially for a capacitive load, there will be a large inrush current at the moment of power-on. If certain buffering measures are not taken, the equipment may be burned out due to the excessive inrush current.

[0003] In the prior art, a high-power resistor (usually a cement resistor) is usually set in the power supply circuit to pre-charge the load to avoid excessive current when powering on, which may cause impact on the load. When the voltage is charged to a certain amplitude, the high-power relay connected in series in the main current path is turned on to achieve continuous power supply to the load. However, both the high-power resistor and the relay have a large volume, and an auxiliary power supply is required to drive the relay, which results in a large volume of the power supply circuit, which is not conducive to the miniaturization design of the power supply circuit. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, a first aspect of the utility model provides a power supply circuit.

[0006] A second aspect of the present invention provides an autonomous mobile device.

[0007] The first aspect of the utility model provides a power supply circuit, comprising: a DC power supply; a first resistor, wherein the first end of the first resistor is connected to the positive electrode of the DC power supply, and the second end of the first resistor is used to be connected to a load; at least one switch tube, wherein the first end of the switch tube is connected to the first end of the first resistor, and the second end of the switch tube is connected to the second end of the first resistor; a sampling circuit, wherein the first end of the sampling circuit is connected to the second end of the first resistor, and the second end of the sampling circuit is connected to the control end of the switch tube and the positive electrode of the DC power supply; wherein the sampling circuit is used to collect the voltage value of the second end of the first resistor, and control the switch tube to be turned on when the voltage value of the second end of the first resistor reaches the first voltage value.

[0008] The power supply circuit provided by the utility model can be used to supply power to a load, and the power supply circuit includes a DC power supply, and the DC power supply is used to provide a low-voltage DC power supply. The power supply circuit also includes a first resistor, and the first end of the first resistor is connected to the positive electrode of the DC power supply, and the second end of the first resistor is used to connect to the load. Through the setting of the first resistor, a buffering effect can be played on the current provided by the DC power supply, thereby avoiding the positive electrode of the DC power supply being directly connected to the load and generating a large current impact on the load, especially for capacitive loads. If the DC power supply is directly connected to the capacitive load, the capacitive load will be burned out due to the large power-on impact circuit.

[0009] Furthermore, the power supply circuit also includes at least one switch tube and a sampling circuit, wherein the switch tube includes a first end, a second end and a control end, the first end of the switch tube is connected to the first end of the first resistor, the second end of the switch tube is connected to the second end of the first resistor, the first end of the sampling circuit is connected to the second end of the first resistor, and the second end of the sampling circuit is connected to the control end of the switch tube and the positive electrode of the DC power supply. That is, the sampling circuit can collect the voltage value of the second end of the first resistor, that is, the voltage value input to the load, and then control the switch tube to turn on when the voltage value of the second end of the first resistor reaches the first voltage value.

[0010] It can be understood that after the switch tube is turned on, the current of the DC power supply will flow directly to the load through the switch tube. At this time, since the current of the DC power supply flows to the load through the first resistor before the switch tube is turned on, the load will not be directly impacted by the large current. After the current received by the load gradually increases, that is, when the voltage value at the second end of the first resistor reaches the first voltage value, the switch tube is turned on. At this time, the current received by the load continues to increase to the required current. In this way, in the process of the power supply circuit supplying power to the load, the voltage at the load end gradually increases, so that the load will not be directly impacted by the large current, thereby avoiding damage to the load due to large current changes.

[0011] Specifically, the sampling circuit is used to collect the voltage value of the second end of the first resistor, and when the voltage value of the second end of the first resistor reaches the first voltage value, change the level of the control end of the switch tube, so that the first end of the switch tube and the second end of the switch tube are conductive, so that the DC power supply can directly power the load.

[0012] The power supply circuit provided by the utility model can buffer the current provided by the DC power supply by setting a first resistor, so as to avoid the positive electrode of the DC power supply being directly connected to the load and causing a large current impact on the load and causing damage to the load. By setting at least one switch tube and a sampling circuit, the voltage value at the load end can be collected, and when the voltage at the load end reaches the first voltage value, the switch tube is controlled to be turned on to realize normal power supply to the load. In addition, compared with the prior art that uses high-power cement resistors and relays to buffer the current received by the load, the power supply circuit provided by the utility model has a smaller volume of the switch tube than the relay, and the switch tube does not need to be provided with an auxiliary power supply for driving, which further reduces the volume of the power supply circuit, thereby facilitating the miniaturization design of the power supply circuit.

[0013] In addition, the power supply circuit in the above technical solution provided by the utility model may also have the following additional technical features:

[0014] In some technical solutions, optionally, the sampling circuit includes: a first voltage-dividing resistor, wherein the first end of the first voltage-dividing resistor is connected to the second end of the first resistor. The second end of the first voltage-dividing resistor is grounded; a voltage reference chip, wherein the first end of the voltage reference chip is connected to the control end of the switch tube and the positive electrode of the DC power supply, the second end of the voltage reference chip is grounded, and the control end of the voltage reference chip is connected to the first end of the first voltage-dividing resistor; wherein, when the voltage value of the second end of the first resistor reaches the first voltage value, the first end of the voltage reference chip and the second end of the voltage reference chip are connected to control the switch tube to be turned on.

[0015] In this technical solution, the sampling circuit may include a first voltage-dividing resistor and a voltage reference chip, wherein one end of the voltage reference chip is connected to the control end of the switch tube and the positive electrode of the DC power supply, and the voltage reference chip can provide an operating voltage through the positive electrode of the DC power supply. At the same time, the voltage reference chip can change the level of the control end of the switch tube when the collected voltage reaches a first voltage value, so as to control the switch tube to be turned on.

[0016] The first end of the first voltage-dividing resistor is connected to the second end of the first resistor, the second end of the first voltage-dividing resistor is grounded, and the control end of the voltage reference chip is connected to the first end of the first voltage-dividing resistor. By setting the first voltage-dividing resistor, the voltage at the second end of the first resistor can be divided to avoid the voltage at the control end of the voltage reference chip being too high and causing impact and damage to the voltage reference chip.

[0017] In some technical solutions, optionally, the sampling circuit further includes: a filter capacitor, a first end of the filter capacitor is connected to the first end of the first voltage-dividing resistor, and a second end of the filter capacitor is connected to the second end of the first voltage-dividing resistor.

[0018] In this technical solution, the sampling circuit also includes a filter capacitor, the first end of the filter capacitor is connected to the first end of the first voltage-dividing resistor, and the second end of the filter capacitor is connected to the second end of the first voltage-dividing resistor. By setting the filter capacitor, the current flowing through the voltage-dividing resistor can be filtered, so that the DC current flowing through the voltage-dividing resistor can be smoother, thereby reducing the interference of the alternating pulsating ripple to the voltage reference chip and other electrical components in the power supply circuit. In addition, the filter capacitor can also effectively reduce the high-frequency noise and clutter interference from the DC power supply or other electromagnetic radiation, ensuring the normal operation of the power supply circuit.

[0019] In some technical solutions, optionally, the sampling circuit further includes: at least one second voltage-dividing resistor, wherein the at least one second voltage-dividing resistor is connected in series between the first end of the first resistor and the first end of the first voltage-dividing resistor.

[0020] In this technical solution, the sampling circuit may further include at least one second voltage-dividing resistor. Specifically, the resistance value and number of the second voltage-dividing resistor may be set according to the operating voltage of the voltage reference chip. Furthermore, while ensuring the total resistance value of at least one second voltage-dividing resistor, the number of the second voltage-dividing resistors may be set to be multiple, thereby reducing the overall volume of the second voltage-dividing resistors, thereby further ensuring the miniaturization design of the power supply circuit.

[0021] Specifically, at least one second voltage-dividing resistor is connected in series between the first end of the first resistor and the first end of the first voltage-dividing resistor. By setting at least one second voltage-dividing resistor, the voltage at the second end of the first resistor can be further divided, thereby further reducing the voltage value of the control end of the voltage reference chip, and avoiding the voltage at the control end of the voltage reference chip being too high and causing impact and damage to the voltage reference chip.

[0022] In some technical solutions, optionally, the sampling circuit further includes: a first zener diode, wherein the anode of the first zener diode is connected to the first end of the voltage reference chip, and the cathode of the first zener diode is connected to the positive electrode of the DC power supply.

[0023] In this technical solution, the sampling circuit may further include a first voltage stabilizing diode. By setting the first voltage stabilizing diode, the voltage at both ends of the voltage reference chip can be reduced, thereby ensuring that the voltage reference chip operates within a safe voltage range. It is understandable that the first end of the voltage reference chip is connected to the positive electrode of the DC power supply. Therefore, in order to avoid the voltage provided by the DC power supply causing the voltage between the first end and the second end of the voltage reference chip to be too large, the first voltage stabilizing diode may be connected in series between the positive electrode of the DC power supply and the first end of the voltage reference chip to reduce the voltage of the motor voltage reference chip and ensure that the voltage reference chip can operate within a safe voltage range.

[0024] Specifically, the anode of the first voltage zener diode is connected to the first end of the voltage reference chip, and the cathode of the first voltage zener diode is connected to the control end of the switch tube, that is, the first voltage zener diode is connected in series between the anode of the DC power supply and the first end of the voltage reference chip.

[0025] In some technical solutions, optionally, the sampling circuit further includes: a third voltage-dividing resistor, a first end of the third voltage-dividing resistor is connected to the cathode of the first voltage-regulating diode, and a second end of the third voltage-dividing resistor is connected to the anode of the DC power supply.

[0026] In this technical solution, the sampling circuit may further include a third voltage-dividing resistor. By arranging the third voltage-dividing resistor between the positive electrode of the DC power supply and the negative electrode of the first voltage-regulating diode, the voltage provided by the DC power supply can be divided, thereby effectively reducing the voltage borne by the negative electrode of the first voltage-regulating diode, so as to ensure that the first voltage-regulating diode can operate within a safe voltage range.

[0027] In some technical solutions, optionally, the power supply circuit also includes: a second voltage regulator diode, the anode of the second voltage regulator diode is connected to the control end of the switch tube, and the cathode of the second voltage regulator diode is connected to the first end of the switch tube.

[0028] In this technical solution, the power supply circuit may further include a second voltage stabilizing diode, which is used to limit the voltage between the first end of the switch tube and the control end of the switch tube, thereby avoiding damage to the switch tube caused by excessive voltage between the control end of the switch tube and the first end of the switch tube.

[0029] Specifically, the anode of the second voltage stabilizing diode is connected to the control end of the switch tube, and the cathode of the second voltage stabilizing diode is connected to the first end of the switch tube.

[0030] In some technical solutions, optionally, the power supply circuit also includes: a fourth voltage-dividing resistor, a first end of the fourth voltage-dividing resistor is connected to the control end of the switch tube, and a second end of the fourth voltage-dividing resistor is connected to the first end of the switch tube.

[0031] In this technical solution, the power supply circuit may further include a fourth voltage-dividing resistor. By arranging the fourth voltage-dividing resistor between the control end of the switch tube and the first end of the switch tube, the voltage of the DC power supply can be divided, so that there is a suitable voltage drop between the first end of the switch tube and the control end of the switch tube, thereby avoiding damage to the switch tube due to excessive voltage between the control end of the switch tube and the first end of the switch tube.

[0032] In some technical solutions, optionally, the switch tube includes a P-type metal oxide semiconductor field effect transistor.

[0033] In this technical solution, the switch tube may include a P-type metal oxide semiconductor field effect transistor. It is understandable that, compared with the mechanical relay in the prior art, the P-type metal oxide semiconductor field effect transistor is not only smaller in size, but also can withstand a larger current, and can withstand frequent switching during operation, so it has a longer service life, that is, it improves the service life of the power supply circuit.

[0034] In some technical solutions, optionally, the first resistor includes a negative temperature coefficient resistor.

[0035] In this technical solution, the first resistor can be a negative temperature coefficient resistor. It can be understood that the resistance of the negative temperature coefficient resistor can change with the change of temperature. Specifically, the higher the temperature of the negative temperature coefficient resistor, the lower the resistance of the negative temperature coefficient resistor. In actual operation, as the power supply time of the DC power supply increases, the temperature of the negative temperature coefficient resistor gradually increases, and accordingly, the resistance of the negative temperature coefficient resistor gradually decreases, so that the current flowing to the load gradually increases, so as to achieve the purpose of automatically adjusting the charging current of the load, thereby reducing the charging time of the load and improving the working efficiency of the power supply circuit.

[0036] The second aspect of the utility model provides an autonomous mobile device, comprising: a load, the load comprising a plurality of capacitors connected in parallel; a power supply circuit as in any one of the above technical solutions, wherein the second end of the first resistor is connected to one end of the capacitor.

[0037] The autonomous mobile device provided by the utility model includes a load, and the load includes a plurality of capacitors connected in parallel, that is, the load of the autonomous mobile device is a capacitive load. Further, the autonomous mobile device also includes a power supply circuit as in any one of the above technical solutions, and the second end of the first resistor of the power supply circuit is connected to one end of the capacitor.

[0038] The autonomous mobile device provided by the utility model includes a power supply circuit as in any one of the above technical solutions. Therefore, the autonomous mobile device has all the beneficial effects of the above power supply circuit, which will not be described in detail here.

[0039] Additional aspects and advantages of the present invention will become apparent in the following description or will be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0041] Figure 1 A schematic diagram of the structure of a power supply circuit provided according to an embodiment of the utility model is shown;

[0042] Figure 2 Shows Figure 1 Waveform diagram showing the voltage values ​​of points VOUT, V ANODE and VG changing with time.

[0043] in, Figure 1 The corresponding relationship between the reference numerals and the component names is as follows:

[0044] 100 power supply circuit, 102 direct current power supply, 104 first resistor, 106 switch tube, 108 sampling circuit, 110 first voltage-dividing resistor, 112 voltage reference chip, 114 filter capacitor, 116 second voltage-dividing resistor, 118 first voltage-dividing diode, 120 third voltage-dividing resistor, 122 second voltage-dividing diode, 124 fourth voltage-dividing resistor, 200 autonomous mobile device, 202 load, 204 capacitor. DETAILED DESCRIPTION

[0045] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0046] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0047] Refer to the following Figure 1 and Figure 2 The power supply circuit and the autonomous mobile device provided according to some embodiments of the present invention are described.

[0048] The utility model provides a power supply circuit 100, such as Figure 1 As shown, the power supply circuit 100 includes: a DC power supply 102; a first resistor 104, a first end of the first resistor 104 is connected to the positive electrode of the DC power supply 102, and a second end of the first resistor 104 is used to connect to a load; at least one switch tube 106, a first end of the switch tube 106 is connected to the first end of the first resistor 104, and a second end of the switch tube 106 is connected to the second end of the first resistor 104; a sampling circuit 108, a first end of the sampling circuit 108 is connected to the second end of the first resistor 104, and a second end of the sampling circuit 108 is connected to the control end of the switch tube 106 and the positive electrode of the DC power supply 102; wherein the sampling circuit 108 is used to collect the voltage value of the second end of the first resistor 104, and control the switch tube 106 to turn on when the voltage value of the second end of the first resistor 104 reaches the first voltage value.

[0049] The power supply circuit 100 provided by the utility model can be used to supply power to a load, and the power supply circuit 100 includes a DC power supply 102, and the DC power supply 102 is used to provide a low-voltage DC power supply 102. The power supply circuit 100 also includes a first resistor 104, a first end of the first resistor 104 is connected to the positive electrode of the DC power supply 102, and a second end of the first resistor 104 is used to connect to the load. Through the setting of the first resistor 104, a buffering effect can be played on the current provided by the DC power supply 102, thereby avoiding the positive electrode of the DC power supply 102 being directly connected to the load and generating a large current impact on the load, especially for capacitive loads. If the DC power supply 102 is directly connected to the capacitive load, the capacitive load will be burned out due to the large power-on impact circuit.

[0050] For example, Figure 1 As shown, the power supply circuit 100 can be a 48V DC power supply, the first resistor can be a 20D-15 type negative temperature coefficient resistor, one end of the resistor without a temperature coefficient is connected to the positive electrode of the DC power supply, and the other end is connected to the load. When the power supply circuit 100 starts to run, the power supply circuit 100 first charges the load through the negative temperature coefficient resistor. During the charging process, the current flowing through the load is 48÷20=2.4A, which will not cause a large impact on the load, ensuring that the load will not be damaged.

[0051] Furthermore, the power supply circuit 100 further includes at least one switch tube 106 and a sampling circuit 108, wherein the switch tube 106 includes a first end, a second end and a control end, the first end of the switch tube 106 is connected to the first end of the first resistor 104, the second end of the switch tube 106 is connected to the second end of the first resistor 104, the first end of the sampling circuit 108 is connected to the second end of the first resistor 104, and the second end of the sampling circuit 108 is connected to the control end of the switch tube 106 and the positive electrode of the DC power supply 102. That is, the sampling circuit 108 can collect the voltage value of the second end of the first resistor 104, that is, the voltage value input to the load, and then control the switch tube 106 to conduct when the voltage value of the second end of the first resistor 104 reaches the first voltage value.

[0052] It can be understood that after the switch tube 106 is turned on, the current of the DC power supply 102 will flow directly to the load through the switch tube 106. At this time, since the current of the DC power supply 102 flows to the load through the first resistor 104 before the switch tube 106 is turned on, the load will not be directly impacted by the large current. After the current received by the load gradually increases, that is, when the voltage value at the second end of the first resistor 104 reaches the first voltage value, the switch tube 106 is turned on. At this time, the current received by the load continues to increase to the required current. In this way, in the process of the power supply circuit 100 supplying power to the load, the voltage at the load end gradually increases, so that the load will not be directly impacted by the large current, thereby avoiding damage to the load due to large current changes.

[0053] Specifically, the sampling circuit 108 is used to collect the voltage value of the second end of the first resistor 104, and when the voltage value of the second end of the first resistor 104 reaches the first voltage value, change the level of the control end of the switch tube 106, so that the first end of the switch tube 106 and the second end of the switch tube 106 are connected, so that the DC power supply 102 can directly supply power to the load. The first voltage value can be set according to the actual situation of the load, for example, it can be 36 volts. The trigger condition of the sampling circuit 108 can be set according to the first voltage value.

[0054] In addition, the number of switch tubes 106 can be set according to the current required for normal operation of the load. Generally, the number of switch tubes 106 can be set to 3 or 4.

[0055] The power supply circuit 100 provided by the utility model can buffer the current provided by the DC power supply 102 by setting the first resistor 104, so as to avoid the positive electrode of the DC power supply 102 being directly connected to the load and causing a large current impact on the load and causing damage to the load. By setting at least one switch tube 106 and a sampling circuit 108, the voltage value of the load end can be collected, and when the voltage at the load end reaches the first voltage value, the switch tube 106 is controlled to be turned on to realize normal power supply to the load. In addition, compared with the prior art that uses high-power cement resistors and relays to buffer the current received by the load, the power supply circuit 100 provided by the utility model has a smaller volume than the relay, and the switch tube 106 does not need to be driven by an auxiliary power supply, which further reduces the volume of the power supply circuit 100, thereby facilitating the miniaturization design of the power supply circuit 100.

[0056] In some embodiments, optionally, Figure 1As shown, the sampling circuit 108 includes: a first voltage-dividing resistor 110, the first end of the first voltage-dividing resistor 110 is connected to the second end of the first resistor 104. The second end of the first voltage-dividing resistor 110 is grounded; a voltage reference chip 112, the first end of the voltage reference chip 112 is connected to the control end of the switch tube 106 and the positive electrode of the DC power supply 102, the second end of the voltage reference chip 112 is grounded, and the control end of the voltage reference chip 112 is connected to the first end of the first voltage-dividing resistor 110; wherein, when the voltage value of the second end of the first resistor 104 reaches the first voltage value, the first end of the voltage reference chip 112 and the second end of the voltage reference chip 112 are connected to control the switch tube 106 to be turned on.

[0057] In this embodiment, the sampling circuit 108 can collect the voltage value of the second end of the first resistor 104, that is, the voltage value input to the load, and then control the switch tube 106 to be turned on when the voltage value of the second end of the first resistor 104 reaches the first voltage value. Specifically, the sampling circuit 108 is used to collect the voltage value of the second end of the first resistor 104, and when the voltage value of the second end of the first resistor 104 reaches the first voltage value, change the level of the control end of the switch tube 106, so that the first end of the switch tube 106 and the second end of the switch tube 106 are turned on, so that the DC power supply 102 can directly power the load.

[0058] Furthermore, if Figure 1 As shown, the sampling circuit 108 may include a first voltage-dividing resistor 110 and a voltage reference chip 112, wherein one end of the voltage reference chip 112 is connected to the control end of the switch tube 106 and the positive electrode of the DC power supply 102, and the voltage reference chip 112 can provide a working voltage through the positive electrode of the DC power supply 102. At the same time, the voltage reference chip 112 can change the level of the control end of the switch tube 106 when the collected voltage reaches a first voltage value, so as to control the switch tube 106 to be turned on.

[0059] The first end of the first voltage-dividing resistor 110 is connected to the second end of the first resistor 104, the second end of the first voltage-dividing resistor 110 is grounded, and the control end of the voltage reference chip 112 is connected to the first end of the first voltage-dividing resistor 110. By setting the first voltage-dividing resistor 110, the voltage at the second end of the first resistor 104 can be divided to avoid the voltage at the control end of the voltage reference chip 112 being too high and causing impact and damage to the voltage reference chip 112.

[0060] Furthermore, if Figure 1 As shown, the sampling circuit 108 further includes: a filter capacitor 114 , a first end of the filter capacitor 114 is connected to a first end of the first voltage-dividing resistor 110 , and a second end of the filter capacitor 114 is connected to a second end of the first voltage-dividing resistor 110 .

[0061] Specifically, the sampling circuit 108 also includes a filter capacitor 114, a first end of the filter capacitor 114 is connected to a first end of the first voltage-dividing resistor 110, and a second end of the filter capacitor 114 is connected to a second end of the first voltage-dividing resistor 110. By providing the filter capacitor 114, the current flowing through the voltage-dividing resistor can be filtered, so that the DC current flowing through the voltage-dividing resistor can be smoother, thereby reducing the interference of the alternating pulsating ripple to the voltage reference chip 112 and other electrical components in the power supply circuit 100. In addition, the filter capacitor 114 can also effectively reduce the high-frequency noise and clutter interference from the DC power supply 102 or other electromagnetic radiation, and ensure the normal operation of the power supply circuit 100.

[0062] Furthermore, if Figure 1 As shown, the sampling circuit 108 further includes: at least one second voltage-dividing resistor 116 , which is connected in series between the first end of the first resistor 104 and the first end of the first voltage-dividing resistor 110 .

[0063] Specifically, the sampling circuit 108 may further include at least one second voltage-dividing resistor 116. Specifically, the resistance value and the number of the second voltage-dividing resistor 116 may be set according to the operating voltage of the voltage reference chip 112. Furthermore, while ensuring the total resistance value of at least one second voltage-dividing resistor 116, the number of the second voltage-dividing resistors 116 may be set to be multiple, thereby reducing the overall volume of the second voltage-dividing resistors 116, thereby further ensuring the miniaturization design of the power supply circuit 100.

[0064] Specifically, at least one second voltage-dividing resistor 116 is connected in series between the first end of the first resistor 104 and the first end of the first voltage-dividing resistor 110. By setting at least one second voltage-dividing resistor 116, the voltage at the second end of the first resistor 104 can be further divided, thereby further reducing the voltage value of the control end of the voltage reference chip 112, and preventing the voltage at the control end of the voltage reference chip 112 from being too high and causing impact and damage to the voltage reference chip 112.

[0065] Furthermore, if Figure 1 As shown, the sampling circuit 108 further includes: a first zener diode 118 , the anode of the first zener diode 118 is connected to the first end of the voltage reference chip 112 , and the cathode of the first zener diode 118 is connected to the anode of the DC power supply 102 .

[0066] Specifically, the sampling circuit 108 may further include a first voltage stabilizing diode 118. By setting the first voltage stabilizing diode 118, the voltage at both ends of the voltage reference chip 112 may be reduced, thereby ensuring that the voltage reference chip 112 operates within a safe voltage range. It is understandable that the first end of the voltage reference chip 112 is connected to the positive electrode of the DC power supply 102. Therefore, in order to prevent the voltage provided by the DC power supply 102 from causing the voltage between the first end and the second end of the voltage reference chip 112 to be too large, the first voltage stabilizing diode 118 may be connected in series between the positive electrode of the DC power supply 102 and the first end of the voltage reference chip 112, so as to reduce the voltage of the motor voltage reference chip 112 and ensure that the voltage reference chip 112 can operate within a safe voltage range.

[0067] Specifically, the anode of the first voltage regulator diode 118 is connected to the first end of the voltage reference chip 112, and the cathode of the first voltage regulator diode 118 is connected to the control end of the switch tube 106, that is, the first voltage regulator diode 118 is connected in series between the anode of the DC power supply 102 and the first end of the voltage reference chip 112.

[0068] Furthermore, if Figure 1 As shown, the sampling circuit 108 further includes: a third voltage-dividing resistor 120 , a first end of the third voltage-dividing resistor 120 is connected to the cathode of the first voltage-stabilizing diode 118 , and a second end of the third voltage-dividing resistor 120 is connected to the anode of the DC power supply 102 .

[0069] Specifically, the sampling circuit 108 may further include a third voltage-dividing resistor 120. By arranging the third voltage-dividing resistor 120 between the positive electrode of the DC power supply 102 and the negative electrode of the first voltage-regulating diode 118, the voltage provided by the DC power supply 102 can be divided, thereby effectively reducing the voltage borne by the negative electrode of the first voltage-regulating diode 118, so as to ensure that the first voltage-regulating diode 118 can operate within a safe voltage range.

[0070] The power supply circuit 100 provided by the utility model can buffer the current provided by the DC power supply 102 by setting the first resistor 104, so as to avoid the positive electrode of the DC power supply 102 being directly connected to the load and causing a large current impact on the load and causing damage to the load. By setting at least one switch tube 106 and a sampling circuit 108, the voltage value of the load end can be collected, and when the voltage at the load end reaches the first voltage value, the switch tube 106 is controlled to be turned on to realize normal power supply to the load. In addition, compared with the prior art that uses high-power cement resistors and relays to buffer the current received by the load, the power supply circuit 100 provided by the utility model has a smaller volume than the relay, and the switch tube 106 does not need to be driven by an auxiliary power supply, which further reduces the volume of the power supply circuit 100, thereby facilitating the miniaturization design of the power supply circuit 100.

[0071] In some embodiments, optionally, Figure 1 As shown, the power supply circuit 100 further includes: a second zener diode 122 , the anode of the second zener diode 122 is connected to the control end of the switch tube 106 , and the cathode of the second zener diode 122 is connected to the first end of the switch tube 106 .

[0072] In this embodiment, the power supply circuit 100 may further include a second zener diode 122, which is used to limit the voltage between the first end of the switch tube 106 and the control end of the switch tube 106, thereby preventing the voltage between the control end of the switch tube 106 and the first end of the switch tube 106 from being too large and causing damage to the switch tube 106.

[0073] Specifically, the anode of the second voltage stabilizing diode 122 is connected to the control end of the switch tube 106 , and the cathode of the second voltage stabilizing diode 122 is connected to the first end of the switch tube 106 .

[0074] Furthermore, the power circuit 100 further includes a fourth voltage-dividing resistor 124 , a first end of the fourth voltage-dividing resistor 124 is connected to the control end of the switch tube 106 , and a second end of the fourth voltage-dividing resistor 124 is connected to the first end of the switch tube 106 .

[0075] Specifically, the power supply circuit 100 may further include a fourth voltage-dividing resistor 124. By setting the fourth voltage-dividing resistor 124 between the control end of the switch tube 106 and the first end of the switch tube 106, the voltage of the DC power supply 102 can be divided, so that there is a suitable voltage drop between the first end of the switch tube 106 and the control end of the switch tube 106, thereby avoiding excessive voltage between the control end of the switch tube 106 and the first end of the switch tube 106, thereby avoiding damage to the switch tube 106.

[0076] In some embodiments, optionally, Figure 1 As shown, the switch tube 106 includes a P-type metal oxide semiconductor field effect transistor.

[0077] In this embodiment, the switch tube 106 may include a P-type metal oxide semiconductor field effect transistor, that is, Figure 1 Specifically, the P-type metal oxide semiconductor field effect transistor includes a source S, a drain D and a gate G, the source of the P-type metal oxide semiconductor field effect transistor is connected to the first end of the first resistor 104, the drain of the P-type metal oxide semiconductor field effect transistor is connected to the second end of the first resistor 104, and the gate of the P-type metal oxide semiconductor field effect transistor is connected to the sampling circuit 108.

[0078] It can be understood that compared with the mechanical relay in the prior art, the P-type metal oxide semiconductor field effect transistor is not only smaller in size, but also can withstand larger currents and can withstand frequent switching during operation, so it has a longer service life, which also increases the service life of the power supply circuit 100.

[0079] In some embodiments, optionally, Figure 1 As shown, the first resistor 104 comprises a negative temperature coefficient resistor.

[0080] In this embodiment, the first resistor 104 can be a negative temperature coefficient resistor. It can be understood that the resistance of the negative temperature coefficient resistor can change with the change of temperature. Specifically, the higher the temperature of the negative temperature coefficient resistor, the lower the resistance of the negative temperature coefficient resistor. In actual operation, as the power supply time of the DC power supply 102 increases, the temperature of the negative temperature coefficient resistor gradually increases, and accordingly, the resistance of the negative temperature coefficient resistor gradually decreases, so that the current flowing to the load gradually increases, so as to achieve the purpose of automatically adjusting the charging current of the load, thereby reducing the charging time of the load and improving the working efficiency of the power supply circuit 100.

[0081] The utility model provides an autonomous mobile device 200, such as Figure 1 As shown, it includes: a load 202 including a plurality of capacitors 204 connected in parallel; a power supply circuit 100 as in any one of the above embodiments, wherein the second end of the first resistor 104 is connected to one end of the capacitor 204 .

[0082] Specifically, the power supply circuit 100 includes: a DC power supply 102; a first resistor 104, wherein a first end of the first resistor 104 is connected to the positive electrode of the DC power supply 102, and a second end of the first resistor 104 is used to be connected to a load; at least one switch tube 106, wherein a first end of the switch tube 106 is connected to a first end of the first resistor 104, and a second end of the switch tube 106 is connected to a second end of the first resistor 104; a sampling circuit 108, wherein a first end of the sampling circuit 108 is connected to a second end of the first resistor 104, and a second end of the sampling circuit 108 is connected to a control end of the switch tube 106 and the positive electrode of the DC power supply 102; wherein the sampling circuit 108 is used to collect a voltage value at the second end of the first resistor 104, and control the switch tube 106 to be turned on when the voltage value at the second end of the first resistor 104 reaches a first voltage value.

[0083] By setting the first resistor 104 in the power supply circuit 100, the current provided by the DC power supply 102 can be buffered to avoid the positive electrode of the DC power supply 102 being directly connected to the load and causing a large current impact on the load and causing damage to the load. By setting at least one switch tube 106 and a sampling circuit 108, the voltage value of the load end can be collected, and when the voltage at the load end reaches the first voltage value, the switch tube 106 is controlled to be turned on to achieve normal power supply to the load. In addition, compared with the prior art that uses high-power cement resistors and relays to buffer the current received by the load, the power supply circuit 100 provided by the utility model has a smaller volume than the relay, and the switch tube 106 does not need to be set with an auxiliary power supply for driving, which further reduces the volume of the power supply circuit 100, thereby facilitating the miniaturization design of the power supply circuit 100.

[0084] The autonomous mobile device 200 provided by the present invention includes a load 202, and the load 202 includes a plurality of capacitors 204 connected in parallel, that is, the load 202 of the autonomous mobile device 200 is a capacitive load. Further, the autonomous mobile device 200 also includes a power supply circuit 100 as in any one of the above embodiments, and the second end of the first resistor 104 of the power supply circuit 100 is connected to one end of the capacitor 204.

[0085] Specifically, the autonomous mobile device 200 includes an autonomous mobile robot (AMR) or an automated guided vehicle (AGV).

[0086] In a specific embodiment, Figure 1As shown, an autonomous mobile device 200 is provided, and the autonomous mobile device 200 includes a power supply circuit 100 and a capacitive load, wherein the power supply circuit 100 includes a 48V DC power supply (48VDD) and a negative temperature coefficient resistor (U1). Specifically, U1 can be a 20D-15 type negative temperature coefficient resistor, one end of U1 is connected to the positive electrode of 48VDD, and the other end is connected to the capacitive load, and the capacitive load includes a plurality of capacitors 204, namely C2, C3, C4, C5 and C6. When the autonomous mobile device 200 starts to run, first, 48VDD charges the capacitive load through U1. During the charging process, the current of the capacitive load is 48÷20=2.4A, which will not cause a large impact on the capacitive load, ensuring that the capacitive load will not be damaged. Further, during the charging process, the resistance of U1 will decrease with the increase of temperature, so as to achieve the purpose of automatically adjusting the charging circuit of the capacitive load, thereby improving the charging efficiency of the capacitive load.

[0087] Furthermore, the power supply circuit 100 also includes three PMOS tubes (positive channel MetalOxide Semiconductor, P-type metal oxide semiconductor field effect transistors) connected in parallel, namely Q1, Q4 and Q5, specifically, the P-type metal oxide semiconductor field effect transistor includes a source S, a drain D and a gate G. And a voltage reference chip U2 and a voltage divider resistor R2, a voltage divider resistor R3 and a voltage divider resistor R4, R2, R3 and R4 are connected in series to the other end of U1. Among them, one end of U2 is connected to the gate of the PMOS tube, and the other end is grounded (GND), and the control end of U2 is connected to one end of R3. The voltage (VOUT) of the load 202 can be divided by R2, R3 and R4, and the voltage is collected by the control end of U2, and when VOUT reaches a certain voltage value, the control end level of the PMOS tube is controlled to change, so that the gate level of the PMOS tube is changed, so that the source and drain of the PMOS tube are turned on, and then 48VDD is realized to supply power to the load 202 through the three PMOS tubes.

[0088] Specifically, during the operation of the power supply circuit 100, Figure 1 The voltage changes of VOUT, V ANODE and VG are as follows: Figure 2 shown.

[0089] Furthermore, the power supply circuit 100 further includes a filter capacitor C1. Through the setting of C1, the interference of the alternating pulsating ripple to U2 and other electrical components in the power supply circuit 100 is reduced.

[0090] Furthermore, the power supply circuit 100 also includes a voltage-stabilizing diode ZD1 and a voltage-stabilizing diode ZD2, as well as a voltage-dividing resistor R1 and a voltage-dividing resistor R5. Among them, by setting ZD2, a voltage-reducing function can be realized so that U2 can work within a safe voltage range. By setting ZD1, the voltage between the source and the gate of the PMOS tube can be clamped to prevent the PMOS tube from being damaged. By setting R1 and R5, the 48VDD can be divided so that there is a suitable voltage drop between the source and the gate of the PMOS tube, thereby ensuring the normal operation of the PMOS tube.

[0091] By setting U1 in the power supply circuit 100, the current provided by the 48V DC power supply can be buffered to avoid the positive electrode of the 48V DC power supply being directly connected to the load and causing a large current impact on the load and causing damage to the load. By setting at least one switch tube 106 and a sampling circuit 108, the voltage value at the load end can be collected, and when the voltage at the load end reaches the first voltage value, the switch tube 106 is controlled to be turned on to achieve normal power supply to the load. In addition, compared with the prior art that uses high-power cement resistors and relays to buffer the current received by the load, the power supply circuit 100 provided by the utility model has a smaller volume than the relay, and the switch tube 106 does not need to be provided with an auxiliary power supply for driving, which further reduces the volume of the power supply circuit 100, thereby facilitating the miniaturization design of the power supply circuit 100.

[0092] In the description of the present invention, the term "plurality" refers to two or more than two. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention. The terms "connection", "installation", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0093] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0094] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power supply circuit, characterized in that: include: DC power supply; a first resistor, wherein a first end of the first resistor is connected to a positive electrode of the DC power supply, and a second end of the first resistor is used to be connected to a load; at least one switch tube, wherein a first end of the switch tube is connected to a first end of the first resistor, and a second end of the switch tube is connected to a second end of the first resistor; A sampling circuit, wherein a first end of the sampling circuit is connected to a second end of the first resistor, and a second end of the sampling circuit is connected to a control end of the switch tube and a positive electrode of the DC power supply; The sampling circuit is used to collect the voltage value of the second end of the first resistor, and control the switch tube to be turned on when the voltage value of the second end of the first resistor reaches a first voltage value.

2. The power supply circuit according to claim 1, characterized in that: The sampling circuit comprises: a first voltage-dividing resistor, wherein a first end of the first voltage-dividing resistor is connected to a second end of the first resistor, and a second end of the first voltage-dividing resistor is grounded; A voltage reference chip, wherein a first end of the voltage reference chip is connected to the control end of the switch tube and the positive electrode of the DC power supply, a second end of the voltage reference chip is grounded, and the control end of the voltage reference chip is connected to the first end of the first voltage-dividing resistor; When the voltage value of the second end of the first resistor reaches the first voltage value, the first end of the voltage reference chip and the second end of the voltage reference chip are connected to control the switch tube to be turned on.

3. The power supply circuit according to claim 2, characterized in that: The sampling circuit also includes: A filter capacitor, wherein a first end of the filter capacitor is connected to a first end of the first voltage-dividing resistor, and a second end of the filter capacitor is connected to a second end of the first voltage-dividing resistor.

4. The power supply circuit according to claim 2, characterized in that: The sampling circuit also includes: At least one second voltage-dividing resistor, wherein the at least one second voltage-dividing resistor is connected in series between the first end of the first resistor and the first end of the first voltage-dividing resistor.

5. The power supply circuit according to claim 2, characterized in that: The sampling circuit also includes: A first voltage stabilizing diode, wherein an anode of the first voltage stabilizing diode is connected to a first end of the voltage reference chip, and a cathode of the first voltage stabilizing diode is connected to a positive electrode of the DC power supply.

6. The power supply circuit according to claim 5, characterized in that: The sampling circuit also includes: A third voltage-dividing resistor, wherein a first end of the third voltage-dividing resistor is connected to the cathode of the first voltage-stabilizing diode, and a second end of the third voltage-dividing resistor is connected to the anode of the DC power supply.

7. The power supply circuit according to any one of claims 1 to 6, characterized in that: The power supply circuit also includes: A second voltage stabilizing diode, wherein the anode of the second voltage stabilizing diode is connected to the control end of the switch tube, and the cathode of the second voltage stabilizing diode is connected to the first end of the switch tube.

8. The power supply circuit according to claim 7, characterized in that: The power supply circuit also includes: A fourth voltage-dividing resistor, wherein a first end of the fourth voltage-dividing resistor is connected to the control end of the switch tube, and a second end of the fourth voltage-dividing resistor is connected to the first end of the switch tube.

9. The power supply circuit according to any one of claims 1 to 6, characterized in that: The switch tube includes a P-type metal oxide semiconductor field effect transistor.

10. The power supply circuit according to any one of claims 1 to 6, characterized in that: The first resistor includes a negative temperature coefficient resistor.

11. An autonomous mobile device, characterized in that: include: a load, the load comprising a plurality of capacitors connected in parallel; The power supply circuit according to any one of claims 1 to 10, wherein the second end of the first resistor is connected to one end of the capacitor.

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