WO2022068061A1

WO2022068061A1 - Power source switching apparatus and gimbal

Info

Publication number: WO2022068061A1
Application number: PCT/CN2020/135419
Authority: WO
Inventors: 吕锦贤; 王德君
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2020-09-30
Filing date: 2020-12-10
Publication date: 2022-04-07
Also published as: CN214337634U

Abstract

A power source switching apparatus and a gimbal, which relate to the technical field of gimbals, and reduce power loss during power source changeover and prevent the occurrence of mutual backflow of two power sources. The power source switching apparatus (10) comprises: a first power supply module (102), a second power supply module (104) and a switching circuit. The switching circuit comprises a switching unit (106), wherein the switching unit (106) comprises a first power transmission line (1062), a second power transmission line (1064), and a first switch assembly (1066) arranged on the second power transmission line (1064); an input end of the first power transmission line (1062) and a controlled end of the first switch assembly (1066) are respectively electrically connected to the first power supply module (102); the controlled end is used for controlling the first switch assembly (1066) to turn on and/or turn off; an input end of the second power transmission line (1064) is electrically connected to the second power supply module (104); when the first power supply module (102) is not connected to a power source, the first switch assembly (1066) is turned on, and the second power supply module (104) supplies power by means of a power supply end (110); and when the first power supply module (102) is connected to a power source, the first switch assembly (1066) is turned off, and the first power supply module (102) supplies power by means of the power supply end (110).

Description

Power switch and pan/tilt

This application claims the priority of the Chinese patent application filed on September 30, 2020 with the application number 202022223973.5 and the invention titled "Power Switching Device and PTZ", the entire contents of which are incorporated into this application by reference.

technical field

The present disclosure relates to the technical field of PTZs, and in particular, to a power switching device and a PTZ.

Background technique

For electronic devices such as a gimbal, there are usually at least two power supply methods, one is directly powered by installing a built-in battery, and the other is powered by connecting the power supply interface on the electronic device to an external power supply.

In the related art, when the self-contained battery is used for power supply, if an external power supply is inserted, the power supply will be switched to the external power supply after the step-up and step-down of the charging chip. On the other hand, mutual backflow of the two power sources is prone to occur.

Overview

The technical problem to be solved by the embodiments of the present disclosure is to provide a power switching device and a pan/tilt head, which can prevent the phenomenon of mutual backflow between the two power sources while reducing the power loss of the power conversion.

In order to solve the above problem, an embodiment of the first aspect of the present disclosure provides a power supply switching device, comprising: a first power supply module, a second power supply module and a switching circuit, the switching circuit includes a switching unit, wherein,

The switching unit includes a first power transmission line, a second power transmission line, and a first switch component disposed on the second power transmission line, and the output ends of the first power transmission line and the second power transmission line are both connected to the power supply end connected, the power supply terminal is used to supply power to the outside;

The input end of the first power transmission line and the controlled end of the first switch assembly are respectively electrically connected to the first power supply module, and the controlled end is used to control the conduction and/or of the first switch assembly. or disconnected, the input end of the second power transmission line is electrically connected to the second power supply module;

When the first power supply module is not connected to a power supply, the first switch assembly is turned on, and the second power supply module supplies power through the power supply terminal; when the first power supply module is connected to a power supply, The first switch assembly is disconnected and powered by the first power supply module through the power supply terminal.

Optionally, the first switch component includes a first power tube and a first diode connected in parallel, the cathode of the first diode is connected to the output end of the first power transmission line, and the first and second diodes are connected in parallel. The anode of the pole tube is the input end of the second power transmission line, the controlled pole of the first power tube is the controlled end, and is electrically connected to the first power supply module, and is connected to the first power supply module In the case of a power supply, the first power supply module controls the first power tube to be disconnected;

When the voltage of the output end of the first power transmission line is greater than the input end of the second power transmission line, the first switch tube is turned off, and the power supply end is powered by the first power supply module.

Optionally, the switching unit further includes:

The second switch assembly is disposed on the first power transmission line. In the case that the first power supply module is not connected to the power supply, the second switch assembly is configured to be in an off state, and the first power supply module is connected to the power supply. In this case, the second switch assembly is configured to be in a conducting state.

Optionally, the second switch assembly includes:

A second power tube, the first pole of the second power tube is used to connect to the first power supply module, the second pole of the second power tube is used to connect to the power supply terminal, the second power tube The controlled pole of the tube is used to receive a control signal. When the first power supply module is not connected to the power supply, the control signal is used to control the second power tube to disconnect, and the first power supply module is connected to the power supply. In the case of , the control signal is used to control the conduction of the second power tube.

Optionally, the second switch assembly further includes:

The third power tube, the first pole of the third power tube is used for grounding, the second pole of the third power tube is used to connect to the controlled pole of the second power tube, the third power tube The controlled pole of the third power tube is used to receive the pulse signal, and the second pole of the third power tube is used to input the control signal to the second power tube according to the pulse signal.

Optionally, the switching circuit further includes a slow start unit, the input end of the slow start unit is connected to the first power supply module, and the output end of the slow start unit is connected to the input end of the first power transmission line , the slow start unit is configured to control the first power supply module to input an inrush current to the first power transmission line.

Optionally, the slow start unit includes:

a fourth power tube, the first pole of the fourth power tube is connected to the first power supply module, the second pole of the fourth power tube can be connected to the input end of the first power transmission line, the first power tube The controlled electrodes of the four power tubes are connected to the first power supply module through a first resistor.

Optionally, the slow start unit further includes:

A second diode and a fifth power tube are connected in parallel, the anode of the second diode is connected to the second pole of the fourth power tube, and the cathode of the second diode is connected to the first power tube At the input end of the power transmission line, the controlled pole of the fifth power tube can be connected to the controlled pole of the fourth power tube.

Optionally, the slow start unit further includes:

a comparator, the first input terminal of the comparator is connected to the first power supply module, the second input terminal of the comparator is connected to the second power supply module, and the output terminal of the comparator is connected to the The controlled pole of the fifth power tube is used to turn on the fifth power tube when the voltage of the first power supply module is greater than the voltage of the second power supply module. When the voltage drops to the voltage of the second power supply module when it rains, the fifth power tube is disconnected.

Optionally, both the first power supply module and the second power supply module are DC power supply modules.

Optionally, the first power supply module includes a USB port.

Optionally, the second power supply module includes a VCC port.

Optionally, the second power supply module includes a battery module.

Optionally, the second power supply module further includes a battery chip, a first end of the battery chip is connected to the battery module, a second end of the battery chip is connected to the first power supply module, and the battery The third terminal of the chip is connected to the input terminal of the second power transmission line.

An embodiment of the second aspect of the present disclosure provides a pan/tilt head, including: the power switching device according to the embodiment of the first aspect of the present disclosure.

In the embodiment of the present disclosure, a switching circuit is provided. The switching circuit includes a switching unit. The switching unit includes two power transmission lines. The line common output end is used as the power supply end of the power switching device, and a first switch assembly is also provided on the second transmission line, and the first switch assembly can be turned off when the first power supply module is connected to the power supply to disconnect the first power supply module. The second power supply module is powered by the second power transmission line, and is switched to be powered by the first power supply module through the first power transmission line, and the first switch component is turned on when the power supply of the first power supply module is disconnected to switch to the second The power supply module supplies power through the second power transmission line.

The power supply switching device realizes the power supply switching between the first power supply module and the second power supply module through the provided first switch assembly. Power loss, on the other hand, based on the switching performance of the first switch component, mutual backflow between the first power supply module and the second power supply module can be prevented, so as to ensure the reliability and safety of power switching.

The above description is only an overview of the technical solutions of the present disclosure. In order to understand the technical means of the present disclosure more clearly, it can be implemented according to the contents of the description, and in order to make the above-mentioned and other purposes, features and advantages of the present disclosure more obvious and easy to understand , the following specific embodiments of the present disclosure are given.

Brief Description of Drawings

In order to illustrate the embodiments of the present disclosure or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present disclosure, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic block diagram of an embodiment of a power switching device of the present disclosure;

FIG. 2 is a schematic block diagram of another embodiment of a power switching device of the present disclosure;

3 is a schematic block diagram of yet another embodiment of a power switching device of the present disclosure;

4 is a schematic circuit diagram of an embodiment of a power switching device of the present disclosure;

5 is a schematic circuit diagram of another embodiment of a power switching device of the present disclosure;

6 is a partial circuit schematic diagram of an embodiment of a power switching device of the present disclosure;

FIG. 7 is a schematic diagram of the circuit board connection of the gimbal embodiment of the present disclosure.

Among them, the corresponding relationship between the reference numerals and the component names in Fig. 1 to Fig. 7 is:

10 Power switching device, 102 first power supply module, 104 second power supply module, 106 switching unit, 1062 first power transmission line, 1064 second power transmission line, 1066 first switch assembly, 1068 second switch assembly, 108 slow start unit, 110 power supply terminal, 110 battery chip.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a co-existence of an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terms used herein in the specification of the present disclosure are for the purpose of describing specific embodiments only, and are not intended to limit the present disclosure. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Some embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The embodiments described below and features in the embodiments may be combined with each other without conflict.

A preferred embodiment of the present disclosure provides a pan/tilt head on which a load is disposed. In this embodiment, the load is a camera module. Of course, in other embodiments, the load may also be other, such as a microcomputer or a projection device. The gimbal can be a single-axis gimbal, a dual-axis gimbal, and a three-axis gimbal.

Referring to FIG. 1 , a schematic block diagram of an embodiment of a power switching apparatus of the present disclosure is shown. The power switching apparatus includes:

The first power supply module 102 , the second power supply module 104 and the switching circuit, the switching circuit includes a switching unit 106 .

The first power supply module 102 and the second power supply module 104 are both DC power supply modules.

The first power supply module 102 includes a USB port.

The second power supply module 104 includes a VCC port or a battery module.

The first power supply module 102 can be connected to the first input terminal and the second input terminal of the switching unit 106, respectively, and the second power supply module 104 is connected to the input terminal of the second power transmission line. When a power supply module 102 is not connected to a power supply, the switching unit is connected to the power supply terminal 110, and the power supply terminal 110 is used for outputting a power supply signal according to the input signal of the input terminal of the second power transmission line. When the power supply is connected, the power supply terminal 110 is configured to output a power supply signal according to the input signals of the first input terminal and the second input terminal, and stop outputting the power supply signal.

The switching unit 106 includes a module connecting the first power supply module 102 and the power supply terminal 110 , a module connecting the second power supply module 104 and the power supply terminal 110 , and controlling the conduction or disconnection between the second power supply module 104 and the power supply terminal 110 module.

Specifically, the switching unit 106 includes a first power transmission line, a second power transmission line, and a first switch component 1066 disposed on the second power transmission line. The outputs of the first power transmission line and the second power transmission line are The terminals are all connected to the power supply terminal 110 to output the power supply signal; the first input terminal is the input terminal of the first power transmission line, and the second input terminal is the controlled terminal of the first switch component 1066 , that is, the input end of the first power transmission line 1062 and the controlled end of the first switch component 1066 are respectively electrically connected to the first power supply module, and the controlled end is used to control the first switch component 1066 is turned on and/or off, the input end of the second power transmission line 1064 is electrically connected to the second power supply module 104 .

When the first power supply module 102 is not connected to a power supply, the first switch assembly 1066 is turned on, and the second power supply module 104 supplies power through the power supply terminal 110; when the first power supply module 102 is connected In the case of power supply, the first switch assembly 1066 is disconnected, and the first power supply module 102 supplies power through the power supply terminal 110 .

Wherein, the power supply terminal 110 may be regarded as a power supply port, which is electrically connected with other devices to realize external power supply, and the power supply port may specifically be a USB port, a serial interface, a parallel interface, or the like.

In addition, the first switch component 1066 may be a switch component with a delay function to ensure reliable switching between the first power supply module 102 and the second power supply module 104 .

Specifically, the first switch component 1066 may include a parallel-connected switching device and a unidirectional conduction device. When the first power supply module 102 is connected to the power supply, the switching device is turned off, and the cathode voltage of the unidirectional conduction device rises to be greater than the anode voltage. In the case of voltage, the unidirectional conduction device is turned off, the second power supply module 104 stops power supply, and the first power supply module 102 starts to supply power.

In this embodiment, by setting the switching unit 106, the switching unit 106 includes two power transmission lines, and each power transmission line is provided with an input end to be connected to the first power supply module 102 and the second power supply module 104 correspondingly, and the two power transmission lines The line common output terminal is used as the power supply terminal 110 of the power switching device, and a first switch component 1066 is also provided on the second transmission line. The first switch component 1066 can be turned off when the first power supply module 102 is connected to the power supply, In order to disconnect the power supply of the second power supply module 104 through the second power transmission line, and switch to the first power supply module 102 to supply power through the first power transmission line, the first switch component 1066 conducts the power supply when the first power supply module 102 is disconnected from the power supply. to switch to the second power supply module 104 to supply power through the second power transmission line again.

The power supply switching device realizes the power supply switching between the first power supply module 102 and the second power supply module 104 through the provided first switch component 1066. The power loss of power conversion, on the other hand, based on the switching performance of the first switch component 1066, can prevent mutual backflow between the first power supply module 102 and the second power supply module 104 to ensure the reliability and safety of power switching.

Referring to FIGS. 4 and 5 , in an embodiment of the present disclosure, the first switch component 1066 includes a first power transistor Q1 and a first diode D1 connected in parallel, that is, the switching device is the first power transistor Q1, and the single The conduction device is a first diode D1, the cathode of the first diode D1 is connected to the output end of the first power transmission line, and the anode of the first diode D1 is the second power transmission line The controlled terminal of the first power transistor Q1 is the controlled terminal of the first switch component 1066 , and is electrically connected to the first power supply module 102 .

When the first power supply module is connected to a power supply, the first power supply module controls the first power tube to be disconnected.

When the voltage of the output terminal of the first power transmission line 1062 is greater than the input terminal of the second power transmission line 104 , the first switch tube D1 is turned off, and the power supply terminal 110 is powered by the first power supply module 102 .

In this embodiment, the first power transistor Q1 and the first diode D1 connected in parallel are used as the first switch component 1066, the anode of the first diode D1 is connected to the second power supply module 104, and the first diode D1 is connected to the second power supply module 104. The cathode of the first power tube Q1 is connected to the output end of the first power transmission line, the controlled electrode of the first power tube Q1 is connected to the first power supply module 102, and the other two electrodes of the first power tube Q1 are connected in parallel with the first diode D1. When the power supply module 102 is connected to the power supply, the first power transistor Q1 is turned off under the action of the voltage applied by the first power supply module 102 and the second power supply module 104. When the first power supply module 102 is not connected to the power supply, the first power The power transistor Q1 is turned on under the action of the voltage applied by the second power supply module 104 , so as to prevent the first power supply module 102 from backflowing the power supply current to the second power supply module 104 .

When the voltage applied by the first power supply module 102 is lower than the voltage applied by the second power supply module 104, the first diode D1 is turned on, and the second power supply module 104 is still powered, and the voltage applied by the first power supply module 102 rises to greater than When the voltage applied by the second power supply module 104 is applied, the first diode D1 is turned off to switch to be powered by the first power supply module 102 , thereby ensuring the reliability of power supply and preventing the output voltage of the power supply terminal 110 from being unstable.

Wherein, the first power transistor Q1 may be a triode, a MOS transistor or an IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor).

Specifically, when the power transistor is used as a switch, it works in the saturated operating region (on) and the cut-off region (off), and there is a conductance modulation effect when it is on, with low on-resistance, low on-voltage drop, and low static loss. . The on-resistance has a negative temperature coefficient.

The MOS tube voltage control element only needs to absorb or release current from the gate when switching, so the driving loss is small.

Referring to FIG. 2 , in an embodiment of the present disclosure, the switching unit 106 further includes: a second switch component 1068 , which is disposed on the first power transmission line, and when the first power supply module 102 is not connected to a power source Next, the second switch assembly 1068 is configured to be in an off state, and when the first power supply module 102 is connected to a power source, the second switch assembly 1068 is configured to be in an on state. Second switch assembly 1068

In this embodiment, by arranging the second switch assembly 1068 on the first power transmission line, the second switch assembly 1068 is used to control the conduction or disconnection of the first power transmission line, specifically, the first power supply module 102 is connected to In the case of the power supply, the second switch component 1068 is triggered and turned on, so that the first power supply module 102 can reliably supply power through the first power transmission line, and can prevent the voltage mutation of the output end of the first power transmission line, and ensure the reliability of the power supply module switching. .

Referring to FIGS. 4 and 5 , in an embodiment of the present disclosure, the second switch component 1068 includes: a second power transistor Q2, the first pole of which is used to connect to the first power transistor Q2 In the power supply module 102 , the second pole of the second power tube Q2 is used for connecting to the power supply terminal 110 , and the controlled pole of the second power tube Q2 is used for receiving control signals. In the first power supply module 102 When the power supply is not connected, the control signal is used to control the second power tube Q2 to be disconnected, and when the first power supply module 102 is connected to the power supply, the control signal is used to control the second power Tube Q2 is turned on

Wherein, the second power transistor Q2 may be a triode, a MOS transistor or an IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor).

In this embodiment, by using the second power transistor Q2 as the second switch component 1068, the first electrode and the second electrode (respectively the source electrode and the drain electrode, or the emitter electrode and the collector electrode) of the second power transistor Q2 are respectively It is connected with the first power transmission line to control the on-off of the first power supply line by receiving the control signal through the controlled electrode, so as to improve the reliability and safety of the power signal transmission of the first power supply line.

6, in an embodiment of the present disclosure, the second switch assembly 1068 further includes: a third power transistor Q3, the first pole of the third power transistor Q3 is used for grounding, the third power transistor Q3 The second pole of Q3 is used to connect to the controlled pole of the second power transistor Q2, the controlled pole of the third power transistor Q3 receives the pulse signal, and the second pole of the third power transistor Q3 is used for The pulse signal inputs the control signal to the second power transistor Q2.

In this embodiment, on the basis of setting the second power transistor Q2 in the second switch assembly 1068, a third power transistor Q3 is further set, the base of the third power transistor Q3 receives the pulse signal, and the third power transistor Q3 transmits the pulse signal. The electrode is grounded, and the collector of the third power transistor Q3 is connected to the controlled electrode of the second power transistor Q2, so as to transmit a signal to the controlled electrode through the collector to control the opening and closing of the second power transistor Q2.

Referring to FIG. 3 , in an embodiment of the present disclosure, the switching circuit further includes a slow start unit 108 , the input end of the slow start unit 108 is connected to the first power supply module 102 , and the slow start unit 108 is The output terminal is connected to the input terminal of the first power transmission line 1062 , and the slow-start unit 108 is configured to control the first power supply module 102 to input an inrush current to the first power transmission line 1062 .

In this embodiment, on the basis of setting the switching unit 106, the switching circuit is further provided with a slow-start unit 108. By setting the slow-start unit 108, on the one hand, when the first power supply module 102 is connected to the power supply, the input current is prevented from over-current. On the other hand, the setting of the slow start unit 108 makes the voltage transmitted from the first power supply module 102 to the power supply terminal 110 gradually increase, and when the voltage rises to greater than When the voltage of the second power supply module 104 is turned off, the first diode D1 is turned off, so as to realize the smooth switching from the second power supply module 104 to the first power supply module 102, and by adjusting the voltage parameters of the power tube, the second power supply module 104 Switching with the first power supply module 102 has more flexible adjustability.

Referring to FIGS. 4 and 5 , in an embodiment of the present disclosure, the slow start unit 108 includes: a fourth power transistor Q4 , and a first pole of the fourth power transistor Q4 is connected to the first power supply module 102 , the second pole of the fourth power transistor Q4 can be connected to the input end of the first power transmission line 1062. Referring to FIG. 6, the controlled pole of the fourth power transistor Q4 is connected to the The first power supply module 102 .

In this embodiment, referring to FIG. 6 , the fourth power transistor Q4 is used as a specific implementation device for slow start, and the controlled electrode of the fourth power transistor Q4 is connected to the first power supply module 102 through the first resistor R1 to prevent the A current surge occurs when a power supply module 102 is connected to a power supply.

4 and 5 , in an embodiment of the present disclosure, the slow start unit 108 further includes: a second diode D2 and a fifth power transistor Q5 connected in parallel, and the anode of the second diode D2 is connected to the second pole of the fourth power tube Q4, and the cathode of the second diode D2 is connected to the first input end of the switching unit 106. Referring to FIG. 6, the fifth power tube Q5 receives The gate electrode is connected to the gate electrode of the fourth power transistor Q4 through the second resistor R2.

In this embodiment, the slow start unit 108 is further provided with a fifth power transistor Q5 and a second diode D2 connected in parallel on the basis of the fourth power transistor Q4, and the anode of the second diode D2 is connected to the second diode D2. In the four power transistors Q4, the cathode of the second diode D2 is connected to the power supply terminal 110. By setting the second diode D2, the second power supply module 104 can prevent backflow to the first power supply module 102.

By arranging the fifth power transistor Q5, the smooth switching performance can be further improved.

In an embodiment of the present disclosure, the slow-start unit 108 further includes: a comparator Q, a first input terminal of the comparator Q is connected to the first power supply module 102, a second input terminal of the comparator Q is connected to the first power supply module 102 The input terminal is connected to the second power supply module 104, and the output terminal of the comparator Q is connected to the controlled electrode of the fifth power transistor Q5, so that the voltage of the first power supply module 102 is greater than that of the second power supply module 102. In the case of the voltage of the power supply module 104, the fifth power transistor Q5 is turned on, and when the voltage of the first power supply module 102 drops to the voltage of the second power supply module 104, the The fifth power tube Q5 is disconnected.

In this embodiment, the slow start unit 108 further includes a comparator Q, the first input terminal of the comparator Q is connected to the first power supply module 102, so that the first power supply module 102 inputs the first voltage to the comparator Q, and compares the The second section of the comparator Q is connected to the second power supply module 104, so that the second power supply module 104 inputs the second voltage to the comparator Q, and when the first voltage is greater than the second voltage, it indicates that the first power supply module 102 is connected power supply, and can output a stable power supply signal. In this case, the output signal of the comparator Q controls the conduction of the fifth power tube Q5, and the first power supply module 102 controls the conduction of the fourth power tube Q4, and the second power tube Q4 is turned on. The power transistor Q2 is configured to be in an on state, and switches the second power supply module 104 to the first power supply module 102 for power supply.

4 , in an embodiment of the present disclosure, the second power supply module 104 further includes a battery chip 112 , a first end of the battery chip 112 is connected to the battery module, and a second end of the battery chip 112 is connected to the battery module. The terminal is connected to the first power supply module 102 , and the third terminal of the battery chip 112 is connected to the input terminal of the second power transmission line 104 .

Specifically, when the first power supply module 102 is a USB port and the second power supply module 104 is a battery module, when the USB port is connected to an external power supply, the switching unit 106 realizes the switching of the power supply module, that is, the power supply.

The USB port is not connected to the power supply, and the battery supplies power to the power supply terminal 110 through the battery chip 112. The first power tube Q1 is turned on, and the fourth power tube Q4, the fifth power tube Q5, and the second power tube Q2 are turned off to prevent the battery Pour back to the USB port.

When the USB port is connected, the USB port first turns off the first power tube Q1 to prevent the USB port from backflowing to the battery. The battery is powered by the diode connected in parallel with the first power tube Q1 to supply power to the power supply terminal 110. The fourth power tube Q4 starts slowly and works at the same time. When the port is higher than the battery, the comparator Q turns on the fifth power transistor Q5, and the voltage of the power supply terminal 110 is switched from the battery voltage to the USB port voltage.

When the USB port is disconnected, the voltage of the USB port will drop. When it drops to about the battery, the comparator Q controls the fifth power transistor Q5 to turn off. The power supply terminal 110 is provided by the battery voltage through the diode connected in parallel with the first power transistor Q1, and the USB port continues to drop. After that, the first power transistor Q1 is turned on, and the voltage of the power supply terminal 110 is switched from the USB port voltage to the battery voltage.

When using the built-in battery for power supply, plug in the external power supply, and the power supply will automatically and quickly switch to the external power supply; if the external power supply is unplugged, the power supply will automatically and quickly switch to the battery power supply.

5 specifically, when the first power supply module 102 is the power supply terminal of the USB port, and the second power supply module 104 is the VCC port, the USB port is not connected to the power supply, and the VCC port supplies power to the port 110 through the first power transistor Q1, and the first power supply module 104 is the VCC port. A power transistor Q1 is in an on state, and the fourth power transistor Q4/fifth power transistor Q5/second power transistor Q2 is in an off state to prevent BAT from being backflowed to the USB port.

When the USB port is connected, the USB port first turns off the first power transistor Q1 to prevent the USB port from backflowing to the VCC port. The VCC port is powered by a diode connected in parallel with the first power transistor Q1 to supply power to the power supply terminal 110, and the fourth power transistor Q4 starts to work slowly. Meanwhile, when the voltage of the USB port is higher than a certain voltage, the comparator Q turns on the fifth power transistor Q5, and the voltage of the power supply terminal 110 is switched from the voltage of the VCC port to the voltage of the USB port.

When the USB port is disconnected, the voltage of the USB port will drop. When the voltage drops to about a certain voltage, the comparator Q controls the fifth power tube Q5 to turn off. The power supply terminal 110 is provided by the VCC port voltage through the diode connected in parallel with the first power tube Q1. The USB port After the drop continues, the first power transistor Q1 is turned on, and the voltage of the power supply terminal 110 is switched from the USB port voltage to the VCC port voltage.

When the USB port is inserted first, the power is supplied from the USB port whether or not the VCC port is inserted.

An embodiment of a pan/tilt according to the present disclosure includes: the power switching device described in the above embodiment.

Referring to FIG. 7 , in an embodiment of the present disclosure, the first circuit board 20 is the main control board of the gimbal, and is provided with a controller 202 , an FPC connector 204 , a first connector 206 and a second connector 208 , the first connector 206 is used for connecting with the power supply terminal in the power switching device 10 described in the above embodiment, and the second connector 208 is used for connecting with the display screen 50 .

The second circuit board 30 is an ESC and is used to drive the motor 40 to operate. The second circuit board 30 is provided with an FPC connector 304 for electrical connection with the first circuit board, the driving chip 302 and the Hall chip 306, and the driving chip 302 is connected to the motor 40 .

Although the preferred embodiments of the presently disclosed embodiments have been described, additional changes and modifications to these embodiments will occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of the embodiments of the present disclosure.

Finally, it should also be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply these entities or that there is any such actual relationship or sequence between operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or terminal device comprising a list of elements includes not only those elements, but also a non-exclusive list of elements. other elements, or also include elements inherent to such a process, method, article or terminal equipment. Without further limitation, an element defined by the phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, article or terminal device comprising said element.

In the present disclosure, the terms "first", "second" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "plurality" refers to two or two above, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be It is directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

In the description of the present disclosure, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the orientations shown in the accompanying drawings Or the positional relationship is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the indicated device or unit must have a specific direction, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present disclosure.

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

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, but not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

A power supply switching device is characterized in that, comprising: a first power supply module, a second power supply module and a switching circuit, wherein the switching circuit includes a switching unit, wherein,

The switching unit includes a first power transmission line, a second power transmission line, and a first switch component disposed on the second power transmission line, and the output ends of the first power transmission line and the second power transmission line are both connected to the power supply end connected, the power supply terminal is used to supply power to the outside;

The input end of the first power transmission line and the controlled end of the first switch assembly are respectively electrically connected to the first power supply module, and the controlled end is used to control the conduction and/or of the first switch assembly. or disconnected, the input end of the second power transmission line is electrically connected to the second power supply module;

When the first power supply module is not connected to a power supply, the first switch assembly is turned on, and the second power supply module supplies power through the power supply terminal. When the first power supply module is connected to a power supply, The first switch assembly is disconnected and powered by the first power supply module through the power supply terminal.
The power switch device according to claim 1, wherein the first switch component comprises a first power tube and a first diode connected in parallel, and a cathode of the first diode is connected to the first diode. The output end of the transmission line, the anode of the first diode is the input end of the second transmission line, the controlled end of the first power tube is the controlled end, and is connected with the first power supply module Electrical connection, when the first power supply module is connected to a power supply, the first power supply module controls the first power tube to be disconnected;

When the voltage of the output end of the first power transmission line is greater than the input end of the second power transmission line, the first switch tube is turned off, and the power supply end is powered by the first power supply module.
The power switching device according to claim 1, wherein the switching unit further comprises:

The second switch assembly is disposed on the first power transmission line. In the case that the first power supply module is not connected to the power supply, the second switch assembly is configured to be in an off state, and the first power supply module is connected to the power supply. In this case, the second switch assembly is configured to be in a conducting state.
The power switching device according to claim 3, wherein the second switch assembly comprises:

A second power tube, the first pole of the second power tube is used to connect to the first power supply module, the second pole of the second power tube is used to connect to the power supply terminal, the second power tube The controlled pole of the tube is used to receive a control signal. When the first power supply module is not connected to the power supply, the control signal is used to control the second power tube to disconnect, and the first power supply module is connected to the power supply. In the case of , the control signal is used to control the conduction of the second power tube.
The power switching device according to claim 4, wherein the second switch assembly further comprises:

The third power tube, the first pole of the third power tube is used for grounding, the second pole of the third power tube is used to connect to the controlled pole of the second power tube, the third power tube The controlled pole of the third power tube is used to receive the pulse signal, and the second pole of the third power tube is used to input the control signal to the second power tube according to the pulse signal.
The power switching device according to any one of claims 1 to 5, wherein the switching circuit further comprises a slow start unit, an input end of the slow start unit is connected to the first power supply module, the The output end of the slow start unit is connected to the input end of the first power transmission line, and the slow start unit is used for controlling the first power supply module to input an inrush current to the first power transmission line.
The power switching device according to claim 6, wherein the slow start unit comprises:

a fourth power tube, the first pole of the fourth power tube is connected to the first power supply module, the second pole of the fourth power tube can be connected to the input end of the first power transmission line, the first power tube The controlled electrodes of the four power tubes are connected to the first power supply module through a first resistor.
The power switching device according to claim 7, wherein the slow start unit further comprises:

A second diode and a fifth power tube are connected in parallel, the anode of the second diode is connected to the second pole of the fourth power tube, and the cathode of the second diode is connected to the first power tube At the input end of the power transmission line, the controlled electrode of the fifth power tube is connected to the controlled electrode of the fourth power tube through a second resistor.
The power switching device according to claim 8, wherein the slow start unit further comprises:

a comparator, the first input terminal of the comparator is connected to the first power supply module, the second input terminal of the comparator is connected to the second power supply module, and the output terminal of the comparator is connected to the The controlled electrode of the fifth power tube is used to turn on the fifth power tube when the voltage of the first power supply module is greater than the voltage of the second power supply module. When the voltage drops to the voltage of the second power supply module when it rains, the fifth power tube is disconnected.
The power switching device according to any one of claims 1 to 5, wherein:

Both the first power supply module and the second power supply module are DC power supply modules.
The power switching device according to claim 10, wherein:

The first power supply module includes a USB port.
The power switching device according to claim 10, wherein:

The second power supply module includes a VCC port.
The power switching device according to claim 10, wherein:

The second power supply module includes a battery module.
The power switching device according to claim 13, wherein the second power supply module further comprises a battery chip,

The first end of the battery chip is connected to the battery module, the second end of the battery chip is connected to the first power supply module, and the third end of the battery chip is connected to the input of the second power transmission line end.
A pan-tilt, characterized in that, comprising:

The power switching device according to any one of claims 1 to 14.