CN222355964U - Power supply circuit and autonomous mobile apparatus - Google Patents

Abstract

The utility model provides a power supply circuit and an autonomous mobile device, wherein the power supply circuit comprises a direct current power supply, a first resistor, at least one switching tube, a sampling circuit and a sampling circuit, wherein a first end of the first resistor is connected to the positive electrode of the direct current power supply, a 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, a 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, 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, and the sampling circuit is used for collecting the voltage value of the second end of the first resistor and controlling the switching tube to be conducted under the condition that the voltage value of the second end of the first resistor reaches the first voltage value. According to the power supply circuit provided by the utility model, the switch tube is not required to be driven by an auxiliary power supply, so that the volume of the power supply circuit is reduced, and the miniaturization design of the power supply circuit is facilitated.

Description

Power supply circuit and autonomous mobile apparatus

Technical Field

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

Background

In recent years, since an autonomous moving apparatus such as an autonomous moving robot (Autonomous Mobile Robot, abbreviated to AMR) or an automated guided vehicle (Automated Guided Vehicle, abbreviated to AGV) has characteristics of autonomy and high efficiency, the autonomous moving apparatus has been widely used in various scenes such as an intelligent logistics warehouse scene. In the related art of the autonomous mobile apparatus, when the low-voltage dc power supply is supplying power to the load, particularly for capacitive loads, a large impact current is generated at the moment of power-up, and if a certain buffering power-up measure is not adopted, the equipment may be burned out due to the excessive power-up impact current.

In the prior art, a high-power resistor (generally a cement resistor) is arranged in a power circuit to precharge a load, so that the impact on the load caused by overlarge current during power-on is avoided, and when the load is charged to a certain voltage amplitude, a high-power relay connected in series on a main current circuit is opened, so that continuous power supply to the load is realized. However, the resistor and the relay with high power have large volumes, and an auxiliary power switch is required to drive the relay, so that the power circuit has large volumes, which is not beneficial to the miniaturization design of the power circuit.

Disclosure of utility model

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

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

A second aspect of the utility model provides an autonomous mobile apparatus.

The utility model provides a power supply circuit which comprises a direct current power supply, a first resistor, at least one switching tube, a sampling circuit and a sampling circuit, wherein a first end of the first resistor is connected to the positive electrode of the direct current power supply, a 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, a 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, 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, and the sampling circuit is used for acquiring the voltage value of the second end of the first resistor and controlling the switching tube to be conducted under the condition that the voltage value of the second end of the first resistor reaches the first voltage value.

The power supply circuit provided by the utility model can be used for supplying power to a load, and comprises a direct current power supply which is used for providing a low-voltage direct current power supply. The power supply circuit further comprises a first resistor, a first end of the first resistor is connected to the positive electrode of the direct current power supply, a second end of the first resistor is used for being connected to a load, and through the arrangement of the first resistor, the current provided by the direct current power supply can be buffered, so that the situation that the positive electrode of the direct current power supply is directly connected to the load to generate larger current impact on the load is avoided, and particularly, for a capacitive load, if the direct current power supply is directly connected to the capacitive load, the capacitive load can be burnt out due to the larger power-on impact circuit.

Further, the power supply circuit further comprises at least one switching tube and a sampling circuit, wherein the switching tube comprises a first end, a second end and a control end, the first end of the switching tube is connected to the first end of the first electron, 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. 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 switching tube to be turned on when the voltage value of the second end of the first resistor reaches the first voltage value.

It can be understood that after the switch tube is turned on, the current of the direct current power supply can directly flow to the load through the switch tube, at this time, since the current of the direct current power supply flows to the load through the first resistor before the switch tube is turned on, the load cannot be directly impacted by a larger current, after the current received by the load gradually increases, that is, under the condition that the voltage value of the second end of the first resistor reaches the first voltage value, the switch tube is turned on, the current received by the load continues to increase to the required current, and thus, in the process that the power supply circuit supplies power to the load, the voltage of the load end gradually increases, so that the load cannot be directly impacted by the larger current, and the load is prevented from being damaged due to the larger current change.

Specifically, the sampling circuit is used for collecting a voltage value of a second end of the first resistor, and changing the level of a control end of the switching tube when the voltage value of the second end of the first resistor reaches the first voltage value, so that the first end of the switching tube and the second end of the switching tube are conducted, and the direct-current power supply can directly supply power to a load.

The power supply circuit provided by the utility model has the advantages that the first resistor is arranged, so that the current provided by the direct current power supply can be buffered, the damage to the load caused by larger current impact generated by the direct current power supply when the positive electrode is directly connected to the load is avoided, the voltage value of the load end can be acquired by arranging at least one switching tube and the sampling circuit, and the switching tube is controlled to be conducted under the condition that the voltage of the load end reaches the first voltage value, so that the normal power supply to the load is realized. Compared with the prior art that the high-power cement resistor and the relay are adopted to buffer the current received by the load, the power supply circuit provided by the utility model has the advantages that the size of the switching tube is smaller than that of the relay, the switching tube is not required to be driven by an auxiliary power supply, and the size of the power supply circuit is further reduced, so that the miniaturization design of the power supply circuit is facilitated.

In addition, the power supply circuit in the technical scheme provided by the utility model can also have the following additional technical characteristics:

In some embodiments, the sampling circuit optionally includes a first voltage dividing resistor, where a first end of the first voltage dividing resistor is connected to a second end of the first resistor. The switching tube comprises a first voltage dividing resistor, a voltage reference chip and a control terminal, wherein the second terminal of the first voltage dividing resistor is grounded, the first terminal of the voltage reference chip is connected to the control terminal of the switching tube and the positive electrode of a direct current power supply, the second terminal of the voltage reference chip is grounded, the control terminal of the voltage reference chip is connected to the first terminal of the first voltage dividing resistor, and under the condition that the voltage value of the second terminal of the first resistor reaches a first voltage value, the first terminal of the voltage reference chip and the second terminal of the voltage reference chip are conducted to control the switching tube to conduct.

In this technical scheme, sampling circuit can include first bleeder resistor and voltage reference chip, and wherein, the one end of voltage reference chip is connected to the control end of switching tube and DC power supply's positive pole, and voltage reference chip can provide operating voltage through DC power supply's positive pole, and simultaneously, voltage reference chip can change the level of the control end of switching tube under the condition that the voltage of gathering reaches first voltage value to realize controlling the switching tube and switch on.

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.

In some embodiments, the sampling circuit may further include a filter capacitor, 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.

In this technical scheme, sampling circuit still includes filter capacitor, and filter capacitor's first end is connected to the first end of first divider resistance, and filter capacitor's second end is connected to the second end of first divider resistance. Through setting up filter capacitor, can realize flowing through the electric current of divider resistor and carry out the wave filtering to make the direct current that flows through divider resistor can be smoother, and then reduce the alternating ripple and cause the interference to voltage reference chip and other electrical components in the power supply circuit. In addition, the filter capacitor can also effectively reduce high-frequency noise and clutter interference from a direct-current power supply or other electromagnetic radiation, and ensure the normal operation of a power supply circuit.

In some embodiments, the sampling circuit optionally further comprises at least one second voltage dividing resistor connected in series between the first end of the first resistor and the first end of the first voltage dividing resistor.

In this technical solution, the sampling circuit may further include at least one second voltage dividing resistor, and specifically, the resistance value and the number of the second voltage dividing resistors may be set according to the operating voltage of the voltage reference chip. And under the condition of guaranteeing the total resistance of at least one second voltage dividing resistor, the number of the second voltage dividing resistors can be set to be a plurality of, so that the whole volume of the second voltage dividing resistor is reduced, and the miniaturization design of the power supply circuit is further guaranteed.

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. Through the arrangement of at least one second voltage dividing resistor, voltage dividing treatment can be further carried out on the voltage of the second end of the first resistor, so that the voltage value of the control end of the voltage reference chip is further reduced, and the voltage of the control end of the voltage reference chip is prevented from being too high to impact the voltage reference chip to damage the voltage reference chip.

In some technical schemes, optionally, the sampling circuit further comprises a first zener diode, wherein the positive electrode of the first zener diode is connected to the first end of the voltage reference chip, and the negative electrode of the first zener diode is connected to the positive electrode of the direct current power supply.

In the technical scheme, the sampling circuit can further comprise a first zener diode, and voltage at two ends of the voltage reference chip can be reduced through the arrangement of the first zener diode, so that the voltage reference chip can be ensured to work in a safe voltage range. It can be understood that the first end of the voltage reference chip is connected to the positive electrode of the dc power supply, so that in order to avoid the excessive voltage between the first end and the second end of the voltage reference chip caused by the voltage provided by the dc power supply, the first zener diode can be connected in series between the positive electrode of the dc power supply and the first end of the voltage reference chip, so as to realize the voltage reduction of the motor voltage reference chip, and ensure that the voltage reference chip can work within a safe voltage range.

Specifically, the positive electrode of the first zener diode is connected to the first end of the voltage reference chip, and the negative electrode of the first zener diode is connected to the control end of the switching tube, that is, the first zener diode is connected in series between the positive electrode of the direct current power supply and the first end of the voltage reference chip.

In some technical schemes, optionally, the sampling circuit further comprises a third voltage dividing resistor, wherein a first end of the third voltage dividing resistor is connected to the cathode of the first zener diode, and a second end of the third voltage dividing resistor is connected to the anode of the direct current power supply.

In the technical scheme, the sampling circuit can further comprise a third voltage dividing resistor, and the voltage provided by the direct current power supply can be divided by setting the third voltage dividing resistor between the positive electrode of the direct current power supply and the negative electrode of the first voltage stabilizing diode, so that the voltage born by the negative electrode of the first voltage stabilizing diode can be effectively reduced, and the first voltage stabilizing diode can work in a safe voltage range.

In some embodiments, the power circuit may further include a second zener diode, an anode of the second zener diode is connected to the control terminal of the switching tube, and a cathode of the second zener diode is connected to the first terminal of the switching tube.

In the technical scheme, the power supply circuit can further comprise a second zener diode, and the voltage between the first end of the switching tube and the control end of the switching tube is limited through the second zener diode, so that the switching tube is prevented from being damaged due to overlarge voltage between the control end of the switching tube and the first end of the switching tube.

Specifically, the positive electrode of the second zener diode is connected to the control end of the switching tube, and the negative electrode of the second zener diode is connected to the first end of the switching tube.

In some technical schemes, optionally, the power supply circuit further comprises a fourth voltage dividing resistor, wherein a first end of the fourth voltage dividing resistor is connected to the control end of the switching tube, and a second end of the fourth voltage dividing resistor is connected to the first end of the switching tube.

In this technical scheme, power supply circuit can also include fourth bleeder resistor, through setting up fourth bleeder resistor between the control end of switch tube and the first end of switch tube, can realize carrying out the bleeder to DC power supply's voltage to have suitable pressure drop between the control end of make switch tube and switch tube, and then avoid the control end of switch tube and the too big switching tube damage that causes of voltage between the first end of switch tube.

In some embodiments, the switching tube may optionally include a P-type metal oxide semiconductor field effect transistor.

In this embodiment, the switching transistor may include a P-type mosfet. It can be appreciated that compared with the mechanical relay in the prior art, the pmos field effect transistor has smaller volume, can bear larger current, and can bear frequent switching in the working process, thus having longer service life, i.e. improving the service life of the power circuit.

In some aspects, optionally, the first resistor comprises a negative temperature coefficient resistor.

In this technical scheme, the first resistor may be a negative temperature coefficient resistor, and it can be understood that the resistance of the negative temperature coefficient resistor can change along with the change of temperature, specifically, the higher the temperature of the negative temperature coefficient resistor is, the lower the resistance of the negative temperature coefficient resistor is, in actual operation, along with the increase of the power supply time of the direct current power supply, the temperature of the negative temperature coefficient resistor gradually increases, and correspondingly, the resistance of the negative temperature coefficient resistor gradually decreases, so that the current flowing to the load gradually increases, thereby achieving the purpose of automatically adjusting the charging current of the load, further reducing the charging time of the load, and improving the working efficiency of the power supply circuit.

In a second aspect of the utility model, an autonomous mobile apparatus is provided, comprising a load comprising a plurality of capacitors connected in parallel, a power supply circuit according to any of the above-mentioned solutions, wherein the second terminal of the first resistor is connected to one terminal of the capacitor.

The autonomous mobile apparatus provided by the utility model comprises a load, wherein the load comprises a plurality of capacitors connected in parallel, namely the load of the autonomous mobile apparatus is a capacitive load. Further, the autonomous mobile apparatus further comprises a power supply circuit according to any of the above claims, a second end of the first resistor of the power supply circuit being connected to one end of the capacitor.

The autonomous mobile apparatus provided by the utility model comprises the power supply circuit according to any one of the above technical schemes, so that the autonomous mobile apparatus has all the beneficial effects of the power supply circuit, and is not described herein.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

Fig. 1 shows a schematic configuration of a power supply circuit provided according to an embodiment of the present utility model;

FIG. 2 shows waveforms of voltage values at points VOUT, V ANODE, and VG of FIG. 1 over time.

The correspondence between the reference numerals and the component names in fig. 1 is:

100 power supply circuits, 102 direct current power supplies, 104 first resistors, 106 switching tubes, 108 sampling circuits, 110 first voltage dividing resistors, 112 voltage reference chips, 114 filter capacitors, 116 second voltage dividing resistors, 118 first voltage stabilizing diodes, 120 third voltage dividing resistors, 122 second voltage stabilizing diodes, 124 fourth voltage dividing resistors, 200 autonomous mobile devices, 202 loads and 204 capacitors.

Detailed Description

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present utility model and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced otherwise than as described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.

Power supply circuits and autonomous mobile devices provided according to some embodiments of the present utility model are described below with reference to fig. 1 and 2.

The utility model provides a power supply circuit 100, as shown in fig. 1, wherein the power supply circuit 100 comprises a direct current power supply 102, a first resistor 104, at least one switching tube 106, a sampling circuit 108 and a sampling circuit 108, wherein a first end of the first resistor 104 is connected to a positive electrode of the direct current power supply 102, a second end of the first resistor 104 is used for being connected to a load, a first end of the switching tube 106 is connected to a first end of the first resistor 104, a second end of the switching tube 106 is connected to a second end of the first resistor 104, a first end of the sampling circuit 108 is connected to a second end of the first resistor 104, a second end of the sampling circuit 108 is connected to a control end of the switching tube 106 and the positive electrode of the direct current power supply 102, and the sampling circuit 108 is used for collecting a voltage value of the second end of the first resistor 104 and controlling the switching tube 106 to be conducted when the voltage value of the second end of the first resistor 104 reaches the first voltage value.

The power supply circuit 100 provided by the utility model can be used for supplying power to a load, and the power supply circuit 100 comprises a direct current power supply 102, wherein the direct current power supply 102 is used for providing a low-voltage direct current power supply 102. The power circuit 100 further includes a first resistor 104, where 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, and by using the arrangement of the first resistor 104, a buffering effect can be achieved on a current provided by the dc power supply 102, so that a large current impact on the load caused by direct connection of the positive electrode of the dc power supply 102 to the load is avoided, especially for a capacitive load, if the dc power supply 102 is directly connected to the capacitive load, the capacitive load is burned out due to the large power impact circuit.

Illustratively, as shown in FIG. 1, the power circuit 100 may be a 48V DC power supply, the first resistor may be a 20D-15 negative temperature coefficient resistor, and one end of the temperature coefficient resistor is connected to the positive pole of the DC power supply, and the other end is connected to a load. When the power circuit 100 starts to operate, the power circuit 100 charges the load through the negative temperature coefficient resistor, and during the charging process, the current flowing through the load is 48++20=2.4a, and the current does not cause great impact on the load, so that the load is ensured not to be damaged.

Further, the power circuit 100 further includes at least one switching tube 106 and a sampling circuit 108, wherein the switching tube 106 includes a first end, a second end and a control end, the first end of the switching tube 106 is connected to the first end of the first electronic component, the second end of the switching 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 switching 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 be turned on when the voltage value of the second end of the first resistor 104 reaches the first voltage value.

It can be understood that, after the switch tube 106 is turned on, the current of the dc power supply 102 directly flows 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 is not directly impacted by a larger current, after the current received by the load gradually increases, that is, when the voltage value of the second end of the first resistor 104 reaches the first voltage value, the switch tube 106 is turned on, and the current received by the load continues to increase to the required current, so that, during the process of supplying power to the load by the power circuit 100, the voltage of the load end gradually increases, so that the load is not directly impacted by the larger current, and damage of the load due to the larger current change is avoided.

Specifically, the sampling circuit 108 is configured to collect a voltage value of the second end of the first resistor 104, and change a level of the control end of the switching tube 106 when the voltage value of the second end of the first resistor 104 reaches the first voltage value, so that the first end of the switching tube 106 and the second end of the switching tube 106 are conducted, so that the dc power supply 102 can directly supply power to the load. The first voltage value may be set according to the actual situation of the load, for example, may be 36 v. The trigger condition of the sampling circuit 108 may be set according to the first voltage value.

In addition, the number of the switching tubes 106 may be set according to the current required for the normal operation of the load, and in general, the number of the switching tubes 106 may be set to 3 or 4.

According to the power supply circuit 100 provided by the utility model, the first resistor 104 is arranged to buffer the current provided by the direct current power supply 102, so that the damage to the load caused by larger current impact generated by the direct current power supply 102 when the positive electrode is directly connected to the load is avoided, the voltage value of the load end can be acquired by arranging at least one switching tube 106 and the sampling circuit 108, and the switching tube 106 is controlled to be conducted under the condition that the voltage of the load end reaches the first voltage value, so that the normal power supply to the load is realized. In addition, compared with the prior art that the high-power cement resistor and the relay are adopted to buffer the current received by the load, the power supply circuit 100 provided by the utility model has the advantages that the size of the switch tube 106 is smaller than that of the relay, the switch tube 106 is not required to be driven by an auxiliary power supply, and the size of the power supply circuit 100 is further reduced, so that the miniaturization design of the power supply circuit 100 is facilitated.

In some embodiments, optionally, as shown in FIG. 1, the sampling circuit 108 includes a first voltage dividing resistor 110, a first end of the first voltage dividing resistor 110 being connected to a second end of the first resistor 104. The second 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, the control end of the voltage reference chip 112 is connected to the first end of the first voltage dividing resistor 110, and 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 conducted to control the switch tube 106 to conduct.

In this embodiment, the sampling circuit 108 is capable of collecting the voltage value of the second terminal of the first resistor 104, that is, the voltage value input to the load, and then controlling the switching tube 106 to be turned on when the voltage value of the second terminal of the first resistor 104 reaches the first voltage value. Specifically, the sampling circuit 108 is configured to collect a voltage value of the second end of the first resistor 104, and change a level of the control end of the switching tube 106 when the voltage value of the second end of the first resistor 104 reaches the first voltage value, so that the first end of the switching tube 106 and the second end of the switching tube 106 are conducted, so that the dc power supply 102 can directly supply power to the load.

Further, as shown in fig. 1, the sampling circuit 108 may include a first voltage dividing resistor 110 and a voltage reference chip 112, where one end of the voltage reference chip 112 is connected to the control end of the switching tube 106 and the positive electrode of the dc power supply 102, and the voltage reference chip 112 can provide an operating voltage through the positive electrode of the dc power supply 102, and at the same time, the voltage reference chip 112 can change the level of the control end of the switching tube 106 under the condition that the acquired voltage reaches the first voltage value, so as to control the switching tube 106 to be turned on.

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, so that voltage of the second end of the first resistor 104 can be divided by setting the first voltage dividing resistor 110, and damage to the voltage reference chip 112 due to impact caused by overhigh voltage of the control end of the voltage reference chip 112 is avoided.

Further, as shown in FIG. 1, the sampling circuit 108 further includes a filter capacitor 114, wherein 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.

Specifically, 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. By providing the filter capacitor 114, the current flowing through the voltage dividing resistor can be filtered, so that the direct current flowing through the voltage dividing resistor can be smoother, and the interference of alternating ripple on the voltage reference chip 112 and other electrical components in the power circuit 100 is reduced. In addition, the filter capacitor 114 can also effectively reduce 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.

Further, as shown in FIG. 1, the sampling circuit 108 further includes at least one second voltage dividing resistor 116, and the 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.

Specifically, the sampling circuit 108 may further include at least one second voltage dividing resistor 116, and specifically, the resistance value and the number of the second voltage dividing resistors 116 may be set according to the operating voltage of the voltage reference chip 112. Also, in the case of 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 plural, thereby reducing the overall volume of the second voltage dividing resistor 116, thereby further ensuring the miniaturized design of the power circuit 100.

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 of the second end of the first resistor 104 can be further divided, so as to further reduce the voltage value of the control end of the voltage reference chip 112, and avoid damage caused by impact to the voltage reference chip 112 due to overhigh voltage of the control end of the voltage reference chip 112.

Further, as shown in FIG. 1, the sampling circuit 108 further includes a first zener diode 118, wherein the positive electrode of the first zener diode 118 is connected to the first end of the voltage reference chip 112, and the negative electrode of the first zener diode 118 is connected to the positive electrode of the DC power supply 102.

Specifically, the sampling circuit 108 may further include a first zener diode 118, and by setting the first zener diode 118, the voltage across the voltage reference chip 112 may be reduced, so as to ensure that the voltage reference chip 112 operates in a safe voltage range. It is understood that the first end of the voltage reference chip 112 is connected to the positive electrode of the dc power source 102, so in order to avoid the voltage between the first end and the second end of the voltage reference chip 112 from being excessively high due to the voltage provided by the dc power source 102, the first zener diode 118 may be connected in series between the positive electrode of the dc power source 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.

Specifically, the positive electrode of the first zener diode 118 is connected to the first end of the voltage reference chip 112, and the negative electrode of the first zener diode 118 is connected to the control end of the switching tube 106, that is, the first zener diode 118 is connected in series between the positive electrode of the dc power supply 102 and the first end of the voltage reference chip 112.

Further, as shown in fig. 1, 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 zener diode 118, and a second end of the third voltage dividing resistor 120 is connected to the anode of the dc power supply 102.

Specifically, the sampling circuit 108 may further include a third voltage dividing resistor 120, where the third voltage dividing resistor 120 is disposed between the positive electrode of the dc power supply 102 and the negative electrode of the first zener diode 118, so as to divide the voltage provided by the dc power supply 102, thereby effectively reducing the voltage born by the negative electrode of the first zener diode 118, so as to ensure that the first zener diode 118 can operate in a safe voltage range.

According to the power supply circuit 100 provided by the utility model, the first resistor 104 is arranged to buffer the current provided by the direct current power supply 102, so that the damage to the load caused by larger current impact generated by the direct current power supply 102 when the positive electrode is directly connected to the load is avoided, the voltage value of the load end can be acquired by arranging at least one switching tube 106 and the sampling circuit 108, and the switching tube 106 is controlled to be conducted under the condition that the voltage of the load end reaches the first voltage value, so that the normal power supply to the load is realized. In addition, compared with the prior art that the high-power cement resistor and the relay are adopted to buffer the current received by the load, the power supply circuit 100 provided by the utility model has the advantages that the size of the switch tube 106 is smaller than that of the relay, the switch tube 106 is not required to be driven by an auxiliary power supply, and the size of the power supply circuit 100 is further reduced, so that the miniaturization design of the power supply circuit 100 is facilitated.

In some embodiments, optionally, as shown in FIG. 1, the power circuit 100 further includes a second zener diode 122, wherein a positive electrode of the second zener diode 122 is connected to the control terminal of the switching tube 106, and a negative electrode of the second zener diode 122 is connected to the first terminal of the switching tube 106.

In this embodiment, the power circuit 100 may further include a second zener diode 122, where the voltage between the first terminal of the switching tube 106 and the control terminal of the switching tube 106 is limited by the second zener diode 122, so as to avoid damage to the switching tube 106 caused by excessive voltage between the control terminal of the switching tube 106 and the first terminal of the switching tube 106.

Specifically, the positive electrode of the second zener diode 122 is connected to the control terminal of the switching tube 106, and the negative electrode of the second zener diode 122 is connected to the first terminal of the switching tube 106.

Further, 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 switching tube 106, and a second end of the fourth voltage dividing resistor 124 is connected to the first end of the switching tube 106.

Specifically, the power circuit 100 may further include a fourth voltage dividing resistor 124, where the fourth voltage dividing resistor 124 is disposed between the control end of the switching tube 106 and the first end of the switching tube 106, so as to divide the voltage of the dc power supply 102, so that a suitable voltage drop exists between the first end of the switching tube 106 and the control end of the switching tube 106, and further avoid damage to the switching tube 106 caused by excessive voltage between the control end of the switching tube 106 and the first end of the switching tube 106.

In some embodiments, optionally, as shown in fig. 1, the switching tube 106 comprises a P-type metal oxide semiconductor field effect transistor.

In this embodiment, the switching tube 106 may include P-type metal oxide semiconductor field effect transistors, i.e., Q1, Q4, and Q5 in fig. 1. Specifically, the pmos field effect transistor includes a source S, a drain D, and a gate G, the source of the pmos field effect transistor is connected to the first terminal of the first resistor 104, the drain of the pmos field effect transistor is connected to the second terminal of the first resistor 104, and the gate of the pmos field effect transistor is connected to the sampling circuit 108.

It can be appreciated that the pmos field effect transistor is not only smaller in size but also can withstand larger currents and frequent switching during operation than the mechanical relay of the prior art, and thus has a longer service life, i.e. the service life of the power circuit 100 is improved.

In some embodiments, optionally, as shown in fig. 1, the first resistor 104 comprises a negative temperature coefficient resistor.

In this embodiment, the first resistor 104 may be a negative temperature coefficient resistor, and it is understood that the resistance of the negative temperature coefficient resistor can be changed along with the change of temperature, specifically, the higher the temperature of the negative temperature coefficient resistor is, the lower the resistance of the negative temperature coefficient resistor is, in actual operation, along with the increase of the power supply time of the dc power supply 102, the temperature of the negative temperature coefficient resistor gradually increases, and correspondingly, 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, and further, the charging time of the load can be reduced, and the working efficiency of the power supply circuit 100 is improved.

The present utility model provides an autonomous mobile device 200, as shown in fig. 1, comprising a load 202, the load 202 comprising a plurality of capacitors 204 connected in parallel, the power supply circuit 100 according to any of the above embodiments, wherein the second terminal of the first resistor 104 is connected to one terminal of the capacitor 204.

Specifically, the power supply circuit 100 includes a direct current power supply 102, a first resistor 104, a first end of which is connected to an anode of the direct current power supply 102, a second end of which is used for being connected to a load, at least one switching tube 106, a first end of which is connected to the first end of the first resistor 104, a second end of which is connected to the second end of the first resistor 104, a sampling circuit 108, a first end of which is connected to the second end of the first resistor 104, a second end of which is connected to a control end of the switching tube 106 and the anode of the direct current power supply 102, wherein the sampling circuit 108 is used for acquiring a voltage value of the second end of the first resistor 104 and controlling the switching tube 106 to be turned on when the voltage value of the second end of the first resistor 104 reaches the first voltage value.

By arranging the first resistor 104 in the power circuit 100, the current provided by the direct current power supply 102 can be buffered, the damage to the load caused by the large current impact generated by the direct connection of the positive electrode of the direct current power supply 102 to the load is avoided, the voltage value of the load end can be collected by arranging at least one switching tube 106 and a sampling circuit 108, and under the condition that the voltage of the load end reaches the first voltage value, the switching tube 106 is controlled to be conducted so as to realize normal power supply to the load. In addition, compared with the prior art that the high-power cement resistor and the relay are adopted to buffer the current received by the load, the power supply circuit 100 provided by the utility model has the advantages that the size of the switch tube 106 is smaller than that of the relay, the switch tube 106 is not required to be driven by an auxiliary power supply, and the size of the power supply circuit 100 is further reduced, so that the miniaturization design of the power supply circuit 100 is facilitated.

The present utility model provides an autonomous mobile device 200 comprising a load 202, the load 202 comprising a plurality of capacitors 204 connected in parallel, i.e. the load 202 of the autonomous mobile device 200 is a capacitive load. Further, the autonomous mobile device 200 further comprises a power circuit 100 according to any of the above embodiments, wherein a second terminal of the first resistor 104 of the power circuit 100 is connected to one terminal of the capacitor 204.

Specifically, the autonomous moving apparatus 200 includes an autonomous moving robot (Autonomous Mobile Robot, abbreviated as AMR) or an automatic guided vehicle (Automated Guided Vehicle, abbreviated as AGV).

In one embodiment, as shown in fig. 1, there is provided an autonomous mobile device 200, wherein 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 (48 VDD) and a negative temperature coefficient resistor (U1), specifically, U1 may be a 20D-15 type negative temperature coefficient resistor, one end of the U1 is connected to the positive electrode of 48VDD, the other end is connected to the capacitive load, and the capacitive load includes a plurality of capacitors 204, that is, C2, C3, C4, C5, and C6. When the autonomous mobile apparatus 200 starts to operate, first 48VDD charges the capacitive load through U1, and during the charging process, the current of the capacitive load is 48++20=2.4a, which does not cause a large impact to the capacitive load, and ensures that the capacitive load is not damaged. Further, in the charging process, the resistance of the U1 can be reduced along with the rise of the temperature, so that the aim of automatically adjusting a charging circuit of the capacitive load is fulfilled, and the charging efficiency of the capacitive load is improved.

Further, the power circuit 100 further includes three PMOS transistors (P-type metal oxide semiconductor field effect transistors) connected in parallel, that is, Q1, Q4, and Q5, specifically, the P-type metal oxide semiconductor field effect transistors include a source S, a drain D, and a gate G. And the voltage reference chip U2 and the voltage dividing resistor R2, the voltage dividing resistor R3 and the voltage dividing resistor R4, and the voltage dividing resistors R2, R3 and R4 are connected in series at the other end of the U1. One end of the U2 is connected to the grid electrode of the PMOS tube, the other end of the U2 is Grounded (GND), the control end of the U2 is connected to one end of the R3, the Voltage (VOUT) of the load 202 can be divided through the R2, the R3 and the R4, the voltage is collected through the control end of the U2, and when the VOUT reaches a certain voltage value, the level of the control end of the PMOS tube is controlled to change, so that the level of the grid electrode of the PMOS tube is changed, the source electrode and the drain electrode of the PMOS tube are conducted, and the load 202 is supplied with power through three PMOS tubes by 48 VDD.

Specifically, during operation of the power circuit 100, the voltage change values at three locations VOUT, V mode, and VG in fig. 1 are shown in fig. 2.

Further, the power circuit 100 further includes a filter capacitor C1, and by setting the filter capacitor C1, interference of alternating ripple on the U2 and other electrical components in the power circuit 100 is reduced.

Further, the power supply circuit 100 further includes a zener diode ZD1 and a zener diode ZD2, and a voltage dividing resistor R1 and a voltage dividing resistor R5. The step-down function can be realized through the setting of ZD2, so that U2 can work in a safe voltage range. Through the setting of ZD1, can clamp the voltage between the source electrode and the grid electrode of PMOS pipe, avoid the PMOS pipe to receive the damage. Through the arrangement of R1 and R5, the voltage division of 48VDD can be realized, so that a proper voltage drop exists between the source electrode and the grid electrode of the PMOS tube, and the normal operation of the PMOS tube is ensured.

By arranging the U1 in the power circuit 100, the current provided by the 48V direct current power supply can be buffered, the damage to the load caused by the fact that the positive electrode of the 48V direct current power supply is directly connected to the load to generate larger current impact to the load is avoided, the voltage value of the load end can be collected by arranging at least one switching tube 106 and a sampling circuit 108, and under the condition that the voltage of the load end reaches a first voltage value, the switching tube 106 is controlled to be conducted so as to realize normal power supply to the load. In addition, compared with the prior art that the high-power cement resistor and the relay are adopted to buffer the current received by the load, the power supply circuit 100 provided by the utility model has the advantages that the size of the switch tube 106 is smaller than that of the relay, the switch tube 106 is not required to be driven by an auxiliary power supply, and the size of the power supply circuit 100 is further reduced, so that the miniaturization design of the power supply circuit 100 is facilitated.

In the description of the present utility model, the term "plurality" shall mean two or more, unless otherwise explicitly defined, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus shall not be construed as limiting the present utility model, and the terms "connected", "mounted", "fixed", etc. shall be construed broadly, e.g. "connected" may be a fixed connection, may be a detachable connection, or an integral connection, may be a direct connection, or may be an indirect connection via an intermediary. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (11)

1. A power supply circuit, comprising: 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 further comprises: 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 further comprises: 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 further comprises: 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 further comprises: 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 further comprises: 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 further comprises: 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 claim 1 , wherein the switch tube comprises a P-type metal oxide semiconductor field effect transistor. 10 . The power supply circuit according to claim 1 , wherein the first resistor comprises a negative temperature coefficient resistor. 11. An autonomous mobile device, comprising: 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.