CN211655831U

CN211655831U - Power supply control circuit, power supply control system and movable platform

Info

Publication number: CN211655831U
Application number: CN201921899616.1U
Authority: CN
Inventors: 张皓渊; 龙玉其; 张文康
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-10-09
Anticipated expiration: 2029-11-05

Abstract

The embodiment of the application provides a power supply control circuit, a power supply control system and a movable platform. Wherein, power supply control circuit includes: the first power supply circuit is electrically connected between the load circuit and a first power supply so as to supply power to the load circuit through the first power supply; the second power supply circuit is electrically connected to a second power supply and is connected with the first power supply circuit in parallel to be connected into the load circuit; the first switch circuit is electrically connected in the second power supply circuit and used for pre-conducting the second power supply circuit when the first power supply supplies power; the detection circuit is used for detecting the electric signal on the second power supply circuit and outputting a first signal when the electric signal meets the requirement; and a second switching circuit for turning on the second power supply circuit in accordance with the first signal; when the second switch circuit is turned on, the second power supply can supply power to the load circuit. The utility model provides a technical scheme will switch to the second power from first power for the power of load circuit power supply, and response speed is fast.

Description

Power supply control circuit, power supply control system and movable platform

Technical Field

The application relates to the technical field of electronic circuits, in particular to a power supply control circuit, a power supply control system and a movable platform.

Background

The movable platform is typically battery powered and typically has only one main power supply system. If the main power supply system is abnormal in the flying working process, the movable platform falls off. In order to avoid such phenomena, a set of second power system can be added on the movable platform, so that when the main power system is powered off accidentally, the second power system can be switched on to provide power for the movable platform.

Currently, the second power system is not ideal enough to switch in to provide power for the movable platform, for example, the movable platform may not fly stably due to untimely switching in.

SUMMERY OF THE UTILITY MODEL

For solving or improving at least one problem that exists among the prior art, the utility model provides a power supply control circuit, power supply control system and movable platform.

An embodiment of the utility model provides a power supply control circuit. The power supply control circuit includes:

the first power supply circuit is electrically connected between a load circuit and a first power supply so as to supply power to the load circuit through the first power supply;

the second power supply circuit is electrically connected to a second power supply, and the second power supply circuit is connected in parallel with the first power supply circuit to be connected into the load circuit;

the first switching circuit is electrically connected in the second power supply circuit and pre-switches on the second power supply circuit when the first power supply supplies power so as to enable the second power supply circuit to have an electric signal;

the detection circuit is used for detecting the electric signal on the second power supply circuit and outputting a first signal when the electric signal meets the requirement; and

a second switching circuit electrically connected to the second power supply circuit and configured to turn on the second power supply circuit according to the first signal; when the second switch circuit is conducted, the second power supply circuit is in a formal conducting state, so that the second power supply can supply power to the load circuit.

Optionally, the first switching circuit comprises:

the conduction direction of the first one-way conduction element is opposite to the flow direction of the second power supply current;

and the first switch is connected with the first unidirectional conducting element in parallel and is used for being in a communicated state when the first power supply supplies power so as to pre-conduct the second power supply circuit.

Optionally, the first switching circuit includes a first MOS transistor switching circuit.

Optionally, the first MOS transistor switch circuit includes an NMOS transistor switch circuit.

Optionally, the drain of the first MOS transistor switch circuit is electrically connected to the second switch circuit; the source electrode of the first MOS tube switching circuit is electrically connected with the load circuit; the grid electrode of the first MOS tube switching circuit is used for being electrically connected with a controller, and the controller is used for outputting a second signal when a first power supply supplies power so as to enable the first MOS tube switching circuit to be conducted and to conduct the second power supply circuit in advance.

Optionally, a first isolation circuit is electrically connected between the gate of the first MOS transistor switch circuit and the controller.

Optionally, a first driving circuit is electrically connected between the gate of the first MOS transistor switching circuit and the controller; the first driving circuit is used for driving the first MOS tube switching circuit to be conducted according to the second signal.

Optionally, the power supply control circuit further includes: the isolation power supply module is used for providing working electric energy for the first driving circuit; the isolated power supply module is provided with an isolated first side end and an isolated second side end; the first power supply and the second power supply are electrically connected with the first side end; the first driving circuit is electrically connected with the second side end.

Optionally, the isolated power supply module comprises:

the control chip is electrically connected to the load circuit; and

the isolation transformer is electrically connected with the control chip;

wherein the isolation transformer has the first side end and the second side end.

Optionally, the second switching circuit comprises:

the conduction direction of the second one-way conduction element is the same as the flow direction of the second power supply current;

and the second switch is connected with the second one-way conduction element in parallel and is used for conducting the second power supply circuit according to the first signal.

Optionally, the second switching circuit includes a second MOS transistor switching circuit.

Optionally, the second MOS transistor switch circuit includes an NMOS transistor switch circuit.

Optionally, the drain of the second MOS transistor switch circuit is electrically connected to the first switch circuit; the source electrode of the second MOS tube switching circuit is electrically connected with the second power supply; and the grid electrode of the second MOS tube switching circuit is electrically connected with the detection circuit.

Optionally, the detection circuit comprises:

a current sensing element for electrical connection in the second power supply circuit;

the detection circuit is used for detecting a current signal on the second power supply circuit in a pre-conduction state through the current detection element; outputting the first signal when the current signal is greater than or equal to a reference signal; or, the detection circuit is used for detecting the voltage signal of the current detecting element in the pre-conducting state through the current detecting element; outputting the first signal when the voltage signal is greater than or equal to a reference voltage.

Optionally, the current detecting element is a first resistor.

Optionally, the detection circuit comprises:

an operational amplifier having a first non-inverting input terminal, a first inverting input terminal, and a first output terminal; the first non-inverting input end and the first inverting input end are respectively and electrically connected to two ends of the detection element, and the first output end is electrically connected with the second non-inverting input end of the comparator;

the comparator is provided with the second non-inverting input end, a second inverting input end and a second output end; the first inverting input end is connected to the reference signal, and the second output end is electrically connected with the second switch circuit.

Optionally, a second isolation circuit is electrically connected between the second output terminal and the second switch circuit.

Optionally, a second driving circuit is electrically connected between the second output end and the second switching circuit;

the second driving circuit is used for driving the second switch circuit to be conducted according to the first signal.

Optionally, the power supply control circuit further includes: the isolation power supply module is used for providing working electric energy for the second driving circuit;

the isolated power supply module is provided with an isolated first side end and an isolated second side end;

the first power supply and the second power supply are electrically connected with the first side end;

the second driving circuit is electrically connected with the second side end.

Optionally, the first power supply is a main power supply, and the second power supply is a standby power supply.

Another embodiment of the present invention provides a power supply control system. This power supply control system includes:

the first power supply is electrically connected to the load circuit to form a first power supply circuit for supplying power to the load circuit;

the second power supply is connected with the first power supply in parallel to be connected into the load circuit to form a second power supply circuit;

the first switch circuit is electrically connected in the second power supply circuit and pre-switches on the second power supply circuit when the first power supply supplies power so as to enable the second power supply circuit to have an electric signal;

Optionally, the power supply control system further includes:

the controller is used for outputting a second signal for pre-conducting the second power supply circuit when the first power supply starts to supply power;

the first switch circuit is configured to pre-turn on the second power supply circuit according to the second signal.

Optionally, the first switching circuit comprises:

Optionally, the power supply control system further includes: the isolation power supply module is used for providing working electric energy for the first driving circuit; the isolated power supply module is provided with an isolated first side end and an isolated second side end; the first power supply and the second power supply are electrically connected with the first side end; the first driving circuit is electrically connected with the second side end.

Optionally, the isolated power supply module comprises:

the control chip is electrically connected to the load circuit; and

the isolation transformer is electrically connected with the control chip;

Optionally, the second switching circuit comprises:

Optionally, the detection circuit comprises:

the detection circuit is used for detecting a current signal on the second power supply circuit in a pre-conduction state through the current detection element; outputting the first signal when the current signal is greater than or equal to a reference signal; or, the detection circuit is used for detecting the voltage signal of the current detecting element in a pre-conducting state through the current detecting element; outputting the first signal when the voltage signal is greater than or equal to a reference voltage.

Optionally, the current detecting element is a first resistor.

Optionally, the detection circuit comprises:

Optionally, the power supply control system further includes: the isolation power supply module is used for providing working electric energy for the second driving circuit;

the second driving circuit is electrically connected with the second side end.

The utility model discloses still another embodiment provides a movable platform. The movable platform comprises: the device comprises a machine body and a power supply control system; the power supply control system is arranged on the machine body; and

the power supply control system includes:

the first power supply is electrically connected to a load circuit of the movable platform to form a first power supply circuit and is used for supplying power to the load circuit;

the first switching circuit is electrically connected in the second power supply circuit and is used for pre-conducting the second power supply circuit when the first power supply supplies power so as to enable the second power supply circuit to have an electric signal;

the detection circuit is used for detecting an electric signal on the second power supply circuit and outputting a first signal when the electric signal meets the requirement; and

the second switching circuit is electrically connected in the second power supply circuit and is used for switching on the second power supply circuit according to the first signal; when the second power supply circuit is conducted, the second power supply circuit is in a formal conducting state, so that the second power supply can supply power to the load circuit.

Optionally, the power supply control system provided by this embodiment may be directly implemented by using the scheme provided by the above embodiment, and specific contents may refer to corresponding contents in the foregoing.

In the technical scheme provided by the embodiment of the utility model, the second power supply circuit is switched on in advance when the first power supply supplies power; due to the hardware property of the circuit when the first power supply supplies power, the second power supply does not supply power to the outside even if the second power supply circuit is pre-conducted; due to the fact that the mechanism of pre-conducting the second power supply circuit is adopted, under the condition that the first power supply is in failure or power-off, the second power supply can timely supply power outwards, response speed is high, and the problem that in the prior art, flying of a movable platform is unstable due to untimely switching is solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic circuit diagram of a power supply control system according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of an isolated power module in a power supply control system according to an embodiment of the present invention;

fig. 3 is a schematic view of a movable platform according to an embodiment of the present invention.

Detailed Description

In order to make the technical field person understand the scheme of the present invention better, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical scheme in the embodiments of the present invention. It should be noted that, the descriptions of "first" and "second" in this document are used for distinguishing different units, circuits, devices, modules, etc., and do not represent a sequential order, nor limit the types of "first" and "second" to be different. In addition, the following embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

The embodiment of the application provides a power supply control circuit, which is used for controlling a power supply to supply power to a load. The power source may be a plurality of, for example, a first power source, a second power source. The two power supplies can be power supplies with the same specification or power supplies with different specifications. The second power supply circuit is switched on in advance when the first power supply supplies power for the load circuit, and the second power supply can supply power to the outside in time under the condition that the first power supply is in circuit failure or power failure, so that the response speed is high, and the problem of unstable power supply caused by untimely power supply switching in the prior art is solved.

The power supply control circuit can be used in movable platforms, such as unmanned aerial vehicles, cloud trolleys, handheld cloud platforms and robots. Through the load circuit and the power supply of electricity connection portable platform, under the condition that first power is because of circuit fault or do not have the electricity, in time to the switching of power for portable platform's operation is more stable.

Fig. 1 shows a schematic diagram of a power supply control circuit according to an embodiment of the present application. The power supply control circuit includes:

a first power supply circuit 100, configured to be electrically connected between a load circuit (not shown in the figure) and a first power supply 1, so as to supply power to the load circuit through the first power supply 1;

a second power supply circuit 200, configured to be electrically connected to a second power supply 2, and configured to be connected in parallel with the first power supply circuit 100 to be connected to the load circuit;

a first switch circuit 3, electrically connected to the second power supply circuit 200, for pre-turning on the second power supply circuit 200 when the first power supply 1 supplies power, so that the second power supply circuit 200 has an electrical signal;

the detection circuit 4 is configured to detect the electrical signal on the second power supply circuit 200, and output a first signal when the electrical signal meets a requirement; and

a second switch circuit 5 electrically connected to the second power supply circuit 200, for turning on the second power supply circuit 200 according to the first signal; when the second switch circuit is turned on, the second power supply circuit 200 is in a formal on state, so that the second power supply 2 can supply power to the load circuit.

What needs to be added here is: the load circuits of the first power supply circuit 100 and the second power supply circuit 200 in fig. 1 are the same circuit. A detailed circuit diagram of the load circuit is not shown in fig. 1. The power supply control circuit provided in this embodiment is applied to different devices, and the load circuit of the power supply control circuit may be different, which is not specifically limited herein. In fig. 1, the VCC _ SYS terminal and the ground terminal may be electrically connected to a load circuit.

What needs to be added here is: the above pre-conduction is understood to be: the second power supply circuit is turned on but the second power supply does not supply power to the outside. The reason for this phenomenon is: when the first power supply supplies power, even if the second power supply circuit is turned on, the second power supply circuit cannot supply power to the outside due to the hardware property of the circuit, but the precondition is that the supply voltage of the first power supply is greater than or equal to the supply voltage of the second power supply.

According to the technical scheme provided by the embodiment, the second power supply circuit is turned on in advance when the first power supply supplies power; due to the hardware property of the circuit when the first power supply supplies power, the second power supply does not supply power to the outside even if the second power supply circuit is pre-conducted; due to the fact that the mechanism of pre-conducting the second power supply circuit is adopted, under the condition that the first power supply is in circuit failure or power failure, the second power supply can supply power to the outside in time, and response speed is high

In an implementable solution, the first switch circuit 3 may comprise: a first one-way conduction element and a first switch. And the conduction direction of the first one-way conduction element is opposite to the flow direction of the second power supply current. And the first switch is connected with the first unidirectional conducting element in parallel and is used for being in a communicated state when the first power supply supplies power so as to pre-conduct the second power supply circuit. The first one-way conduction element is an element that only allows current to flow in a single direction, and in particular, the first one-way conduction element may be a diode. The first switch may be a triode, a MOS transistor (metal-oxide-semiconductor field effect transistor), or the like. The MOS tube is used as a switching element, so that the voltage drop is small after the MOS tube is conducted, and the loss of electric quantity is reduced.

Due to the production process, the high-power MOS tube has a parasitic diode. When a large instantaneous reverse current is generated in the parasitic diode circuit, the current can be led out through the parasitic diode, so that the MOS tube is not broken down. Thus, in practical implementation, the first switch circuit 3 may include a first MOS transistor switch circuit Q6, as shown in fig. 1, and the parasitic diode of the first MOS transistor switch circuit Q6 is D2 in fig. 1. Specifically, the first MOS transistor switch circuit includes an NMOS transistor (N-channel MOS transistor) switch circuit.

Referring to the circuit diagram shown in fig. 1, when the first switch circuit 3 is a first MOS transistor switch circuit Q6, the drain of the first MOS transistor switch circuit Q6 is electrically connected to the second switch circuit 5; the source electrode of the first MOS tube switching circuit Q6 is electrically connected to the load circuit; the gate of the first MOS switch circuit Q6 is electrically connected to a controller, and the controller is configured to output a second signal when the first power supply supplies power, so that the first MOS switch circuit is turned on to pre-turn on the second power supply circuit. The purpose of pre-conducting is: under the condition that the first power supply 1 is in circuit failure or power failure, the second power supply 2 can supply power to the outside in time, and the response speed is high; because the second power supply circuit is in a pre-conduction state, the first power supply circuit can not provide electric energy for the load circuit, and the second power supply can rapidly provide electric energy for the load circuit through the second power supply circuit. The EN1 port in fig. 1 is electrically connected to the controller to receive the second signal output by the controller.

Here, it should be noted that: the power supply control system provided by the embodiment needs to be applied to specific equipment, such as an unmanned aerial vehicle and the like; therefore, the controller for electrically connecting the gate of the first MOS transistor switching circuit Q6 may be a CPU, an MCU, a single chip, or the like, which is not specifically limited in this embodiment.

The electrical signal output by the controller is usually a low voltage signal (usually called weak current signal), and the electrical signal that enables the first MOS transistor switch circuit to be turned on (i.e. the electrical signal transmitted to the gate of the first MOS transistor switch circuit to turn on the first MOS transistor switch circuit) needs to be a high voltage signal. Therefore, in this embodiment, an element capable of performing voltage conversion is required to be added between the first MOS transistor switch circuit and the controller. Referring to fig. 1, a first driving circuit 6 is electrically connected between the gate of the first MOS transistor switch circuit Q6 and the controller (i.e., EN1 port); the first driving circuit 6 is configured to drive the first MOS transistor switch circuit to be turned on according to the second signal. It is understood that the first driving circuit 6 converts the second signal (e.g. high voltage) output by the controller into a high voltage with a higher voltage value to drive the first MOS transistor switch circuit to conduct. It should be noted that how the first driving circuit 6 converts the voltage of the second signal is determined by the whole circuit design parameters according to the hardware properties of the first MOS transistor switch circuit, which is not specifically limited in this embodiment. In addition, the first driving circuit 6 may be implemented by using an existing transformer or other circuit capable of implementing voltage conversion, and this embodiment is not particularly limited in this regard.

Furthermore, the electric energy required by the operation of each element in the load circuit is provided by the first power supply or the second power supply; however, the voltage of the control power signal (such as the first electrical signal output by the detection circuit and the second electrical signal output by the controller mentioned in this embodiment) in the circuit is much smaller than the operating voltage of each element in the second power supply circuit (in the case that the second power supply starts to supply power to the outside); therefore, a first isolation circuit 9 for isolating the high-voltage side from the low-voltage side in the power supply control system is also required to be arranged between the gate of the first MOS transistor switch circuit Q6 and the controller (i.e., the EN1 port in fig. 1). In specific implementation, the first isolation circuit 9 may directly select an isolation chip having a high voltage side and a low voltage side in the isolation circuit in the prior art, which is not specifically limited in this embodiment.

Further, some components in the power supply control system provided in this embodiment, such as the first driving circuit and the first isolation circuit, also need to be powered on. The required operating voltage of such devices is less than the operating voltages of the first and second power supplies. Therefore, an isolation power module is required to be disposed in the power supply control system to provide the first driving circuit 6 and the first isolation circuit 9 with the operating power VCC _ ISO _ B. Specifically, as shown in fig. 1, the isolated power module 10 has a first side end and a second side end which are isolated; the first power supply 1 and the second power supply 2 are electrically connected to the first side end; the first driving circuit 6 and the first isolation circuit 9 are electrically connected to the second side end.

Further, as shown in fig. 2, the isolated power supply module includes: a control chip 101 and an isolation transformer 102. The control chip 101 is electrically connected to the load circuit; an isolation transformer 102 electrically connected to the control chip 101; wherein the isolation transformer 102 has the first side end and the second side end. The first side end of the isolation transformer 102 is electrically connected with the first power supply 1 and the second power supply 2; the second side end of the isolation transformer 102 is electrically connected to the first driving circuit 6 and the first isolation circuit 9.

Further, the second switch circuit Q7 mentioned in this embodiment can be implemented as follows. Namely, the second switching circuit Q7 includes: a second one-way conduction element and a second switch. The conduction direction of the second unidirectional conduction element is the same as the current flowing direction of the second power supply; and the second switch is connected with the second one-way conduction element in parallel and is used for conducting the second power supply circuit according to the first signal. The second one-way conduction element is an element that only allows current to flow in a single direction, and in particular, the second one-way conduction element may be a diode. The first switch may be a triode, a MOS transistor (metal-oxide-semiconductor field effect transistor), or the like.

Similar to the first switch circuit, the second switch circuit may include a second MOS transistor switch circuit Q7, as shown in fig. 1, the parasitic diode of the second MOS transistor switch circuit Q7 is D1 in the figure. Specifically, the second MOS transistor switch circuit includes an NMOS transistor switch circuit.

In specific implementation, the first MOS transistor switch circuit Q6 and the second MOS transistor switch circuit Q7 may be connected in parallel with a plurality of MOS transistor switch circuits, which is helpful for enhancing the current capacity.

Here, it should be noted that: in the technical solution provided in this embodiment, when the first switch circuit is turned on, the second power supply circuit can be turned on in advance, which mainly includes: referring to fig. 1, when the first switch circuit is turned on, the second power supply circuit is turned on in advance due to the effect of the parasitic diode D1 of the second unidirectional conducting element or the second MOS transistor switch circuit Q7 existing in the second switch circuit 5. When the first power supply 1 cannot supply power to the outside due to circuit faults or the fact that the power supply voltage is smaller than the voltage threshold value and the like, the power supply voltage of the first power supply 1 is lower than the voltage of the second power supply 2, at the moment, the second power supply 2 starts to supply power to the outside due to the physical characteristics of the circuit, and the second power supply circuit has current. At this time, the detection circuit 4 can detect the electrical signal on the second power supply circuit, and when the electrical signal (i.e. the current) exceeds a set threshold, the detection circuit 4 outputs a first electrical signal; the second switch circuit 5 is turned on in accordance with the first electric signal. After the first electrical signal is turned on, the supply current from the second power source 2 flows through the first switch circuit 3 and the second switch circuit 5 and is output. The parasitic diode D1 of the first unidirectional conducting element or the second MOS tube switching circuit Q7 has large voltage drop, so that serious heat generation can be caused; the second switching circuit 5 needs to be opened. After the second switch circuit 5 is turned on, the second power supply circuit is in a formal conduction state, and no voltage drop occurs in the parasitic diode, so that the voltage drop of the second switch circuit is small, and the loss of electric quantity is avoided.

Specifically, referring to fig. 1, a drain of the second MOS transistor switch circuit Q7 is electrically connected to the first switch circuit 3; the source electrode of the second MOS tube switching circuit Q7 is connected with the second power supply 2; the gate of the second MOS transistor switching circuit Q7 is electrically connected to the detection circuit 4.

Further, as shown in fig. 1, the detection circuit includes: a current detecting element, and a detection circuit.

the detection circuit is used for detecting a current signal on the second power supply circuit in a pre-conduction state through the current detection element; outputting the first signal when the current signal is greater than or equal to a reference signal; or the detection circuit is used for detecting the voltage signal of the current detecting element in a pre-conducting state through the current detecting element; outputting the first signal when the voltage signal is greater than or equal to a reference voltage.

Once the power supply of the load circuit is switched from the first power supply to the second power supply, the electrical signal of the second power supply circuit may change significantly, and the detection circuit may detect the significant change by detecting the electrical signal of the current detection element, thereby outputting the first signal. Thereby enabling the second switching circuit to conduct the second power supply circuit according to the first signal; when the second switch circuit is conducted, the second power supply circuit is in a formal conducting state, so that the second power supply can supply power to the load circuit. When the second power supply circuit is in a formal conducting state, the voltage drop of the second switch circuit is very small, and the loss of electric quantity is avoided.

In a specific implementation, as shown in fig. 1, the current detecting element is a first resistor R1. The detection circuit can acquire the voltage of the first resistor R1, and compare the voltage value with a reference voltage value to output the first signal. Alternatively, the current signal of the second power supply circuit in the pre-conducting state is detected through the first resistor R1, and the first signal is output when the current signal is greater than or equal to a reference signal. The resistance of the first resistor R1 can be selected based on circuit design requirements, which is not limited in this embodiment. In one implementation, the detection circuit includes:

an operational amplifier U2 having a first non-inverting input, a first inverting input, and a first output; the first non-inverting input end and the first inverting input end are respectively and electrically connected to two ends of the detection element (i.e. a first resistor R1), and the first output end is electrically connected to a second non-inverting input end of a comparator U1;

the comparator U1 has the second non-inverting input terminal, a second inverting input terminal and a second output terminal; the first inverting input end is connected with the reference signal Vref, and the second output end is electrically connected with the second switch circuit Q7.

Further, a second isolation circuit 8 is electrically connected between the second output terminal and the second switch circuit Q7.

Further, a second driving circuit 7 is electrically connected between the second output end and the second switching circuit 5; the second driving circuit 7 is configured to drive the second switch circuit 5 to be turned on according to the first signal.

In this case, as well as the first isolation circuit 9 and the first driver circuit 6, the second isolation circuit 8 and the second driver circuit 7 are provided between the second output terminal and the second switch circuit Q7. Wherein, the second isolation circuit 8 plays the same role in the circuit as the first isolation circuit 9, and the second drive circuit 7 plays the same role in the circuit as the first drive circuit 6; for details, reference may be made to the corresponding contents in the above, and details are not described herein.

It should be noted that, in fig. 1, a third driving circuit 11 is further disposed between the second output terminal of the comparator U1 and the second isolation circuit, and the third driving circuit 11 may be disposed or not disposed. The third drive circuit 11 functions in the same manner as the first drive circuit 6 and the second drive circuit 7. In addition, referring to fig. 1, the second switch circuit 5, i.e., the gate side of the second MOS transistor switch circuit Q7, is further connected to an enable terminal EN 0. Based on the above, the second MOS transistor switch circuit Q7 turns on after receiving the first signal output by the detection circuit (i.e., U1). In fact, the opening of the second MOS transistor switch circuit Q7 may also be triggered by other elements, such as a controller, etc., and the first signal for opening the second MOS transistor switch circuit Q7 is output through the enable terminal EN 0.

Similarly, referring to fig. 1, the isolated power module 10 can also provide an operating power VCC _ ISO _ a for the second driving circuit 7 and the second isolation circuit 8. The isolated power supply module 10 provides an operating voltage VCC _ ISO _ a for the second driving circuit 7. The specific structure of the isolated power supply module 10 can be seen in fig. 2, and the isolated power supply module includes: a control chip 101 and an isolation transformer 102. The control chip 101 is electrically connected to the load circuit; an isolation transformer 102 electrically connected to the control chip 101; wherein the isolation transformer 102 has the first side end and the second side end. The first side end of the isolation transformer 102 is electrically connected with the first power supply 1 and the second power supply 2; the second side end of the isolation transformer 102 is electrically connected to the second driving circuit 7 and the second isolation circuit 8.

The first power supply in the power supply control system provided by this embodiment may be a main power supply; the second power supply may be a backup power supply. The full-power voltage of the main power supply is greater than or equal to the full-power voltage of the backup power supply.

In the technical scheme provided by this embodiment, the second power supply circuit is turned on in advance when the first power supply supplies power; due to the hardware property of the circuit when the first power supply supplies power, the second power supply does not supply power to the outside even if the second power supply circuit is pre-conducted; due to the fact that the mechanism of pre-conducting the second power supply circuit is adopted, under the condition that the first power supply is in failure or power-off, the second power supply can timely supply power outwards, response speed is high, and the problem that in the prior art, flying of a movable platform is unstable due to untimely switching is solved.

The utility model discloses another embodiment still provides a power supply control system. With continued reference to the circuit schematic shown in fig. 1, the power supply control system includes:

a first power supply 1 electrically connected to a load circuit to form a first power supply circuit 100 for supplying power to the load circuit;

a second power supply 2 connected in parallel with the first power supply 1 to be connected to the load circuit (not shown) to form a second power supply circuit 200;

a first switch circuit 3 electrically connected to the second power supply circuit 200, for pre-turning on the second power supply circuit 200 when the first power supply 1 supplies power, so that the second power supply circuit 200 has an electrical signal;

a second switching circuit 5 electrically connected to the second power supply circuit 200, and turning on the second power supply circuit 200 in accordance with the first signal; when the second switch circuit 5 is turned on, the second power supply circuit 200 is in a formal on state, so that the second power supply 2 can supply power to the load circuit.

In fig. 1, the VCC _ SYS terminal and the ground terminal may be electrically connected to a load circuit. In this embodiment, because the second power supply circuit is pre-turned on when the first power supply supplies power, the second power supply can output an electrical signal to the outside through the pre-turned on second power supply circuit due to the characteristics of the circuit hardware itself when the first power supply fails or is without power; the second switch is conducted when the detection circuit detects that the electric signal on the second power supply circuit meets the requirement, so that the second power supply circuit is in a formal conducting state, the second power supply can supply power for the load circuit, the power supply switching process is nearly seamless, and the response block is more stable in operation of equipment (such as a movable platform) of the power supply control system provided by the embodiment.

The load circuit in this embodiment is not shown in fig. 1. The power supply control system provided by the embodiment is applied to different devices, and the load circuit can be different. For example, a flight power system, a flight control system, a camera and the like are electrically connected to a load circuit of the unmanned aerial vehicle; for another example, a load circuit of the unmanned vehicle is electrically connected with: driving power systems, navigation systems, and the like; the first power supply or the second power supply supplies power required for operation to various systems and devices in the load circuit. The VCC _ SYS terminal in fig. 1 is used to electrically connect the load circuit.

Further, the power supply control system provided in this embodiment further includes: and a controller. The controller (not shown in fig. 1) is used for outputting a second signal for pre-conducting the second power supply circuit when the first power supply starts to supply power; the first switch circuit 3 is configured to pre-turn on the second power supply circuit 200 according to the second signal.

In an implementable solution, the first switch circuit 3 may comprise: a first one-way conduction element and a first switch. And the conduction direction of the first one-way conduction element is opposite to the flow direction of the second power supply current. And the first switch is connected with the first unidirectional conducting element in parallel and is used for being in a communicated state when the first power supply supplies power so as to pre-conduct the second power supply circuit. The first one-way conduction element is an element that only allows current to flow in a single direction, and in particular, the first one-way conduction element may be a diode. The first switch may be a triode, a MOS transistor (metal-oxide-semiconductor field effect transistor), or the like.

Referring to the circuit diagram shown in fig. 1, when the first switch circuit 3 is a first MOS transistor switch circuit Q6, the drain of the first MOS transistor switch circuit Q6 is electrically connected to the second switch circuit 5; the source electrode of the first MOS tube switching circuit Q6 is electrically connected to the load circuit; the gate of the first MOS switch circuit Q6 is electrically connected to a controller, and the controller is configured to output a second signal when the first power supply 1 supplies power, so that the first MOS switch circuit Q6 is turned on to pre-turn on the second power supply circuit 200. The EN1 port in fig. 1 is electrically connected to the controller to receive the second signal output by the controller.

The electrical signal output by the controller is usually a low voltage signal (usually called weak current signal), and the electrical signal that enables the first MOS transistor switch circuit to be turned on (i.e. the electrical signal transmitted to the gate of the first MOS transistor switch circuit to turn on the first MOS transistor switch circuit) needs to be a high voltage signal. Therefore, in this embodiment, an element capable of performing voltage conversion is required to be added between the first MOS transistor switch circuit and the controller. Referring to fig. 1, a first driving circuit 6 is electrically connected between the gate of the first MOS transistor switch circuit Q6 and the controller (i.e., EN1 port); the first driving circuit 6 is configured to drive the first MOS transistor switch circuit to be turned on according to the second signal. It is to be understood that, here, the first driving circuit 6 converts the second signal (e.g. high voltage) output by the controller into a high voltage with a higher voltage value to drive the first MOS transistor switch circuit Q6 to conduct. It should be noted that how the first driving circuit 6 converts the voltage of the second signal is determined by the whole circuit design parameters according to the hardware properties of the first MOS transistor switching circuit Q6, which is not specifically limited in this embodiment. In addition, the first driving circuit 6 may be implemented by using an existing transformer or other circuit capable of implementing voltage conversion, and this embodiment is not particularly limited in this regard.

Here, it should be noted that: in the technical solution provided in this embodiment, when the first switch circuit is turned on, the second power supply circuit can be turned on in advance, which mainly includes: referring to fig. 1, when the first switch circuit is turned on, the second power supply circuit is turned on in advance due to the effect of the parasitic diode D1 of the second unidirectional conducting element or the second MOS transistor switch circuit Q7 existing in the second switch circuit 5. When the first power supply 1 cannot supply power to the outside due to circuit faults or the fact that the power supply voltage is smaller than the voltage threshold value and the like, the power supply voltage of the first power supply 1 is lower than the voltage of the second power supply 2, at the moment, the second power supply 2 starts to supply power to the outside due to the physical characteristics of the circuit, and the second power supply circuit has current. At this time, the detection circuit 4 can detect the electrical signal on the second power supply circuit, and when the electrical signal (i.e. the current) exceeds a set threshold, the detection circuit 4 outputs a first electrical signal; the second switch circuit 5 is turned on in accordance with the first electric signal. After the first electrical signal is turned on, the supply current from the second power source 2 flows through the first switch circuit 3 and the second switch circuit 5 and is output. The parasitic diode D1 of the first unidirectional conducting element or the second MOS tube switching circuit Q7 has large voltage drop, so that serious heat generation can be caused; the second switching circuit 5 needs to be opened.

Further, as shown in fig. 1, the detection circuit includes:

the detection circuit is used for detecting a current signal on the second power supply circuit in a pre-conduction state through the current detection element; outputting the first signal when the current signal is greater than or equal to a reference signal.

In a specific implementation, as shown in fig. 1, the current detecting element is a first resistor R1. The resistance of the first resistor R1 can be selected based on circuit design requirements, which is not limited in this embodiment.

In one implementation, the detection circuit includes:

Yet another embodiment of the present application further provides a movable platform. See the movable platform shown in fig. 1 and 3. The movable platform 800 includes: a first power supply 1, a second power supply 2, a controller 840 and a power supply control circuit 850. Alternatively, the movable platform comprises: controller 840 and the power supply control system provided by the above embodiments. The first power supply 1 is electrically connected to a load circuit of the movable platform 800 to form a first power supply circuit 100 for supplying power to the load circuit; the second power supply 2 is connected in parallel with the first power supply 1 to be connected into the load circuit to form a second power supply circuit 200; the controller 840 is configured to output a second signal for pre-turning on the second power supply circuit 200 when the first power supply 1 starts supplying power.

The power supply control circuit 850, as shown in fig. 1, includes:

a first switch circuit 3 electrically connected to the second power supply circuit 200, for pre-turning on the second power supply circuit 200 according to the second signal, so that the second power supply circuit 200 has an electrical signal;

the detection circuit 4 is configured to detect an electrical signal on the second power supply circuit 200, and output a first signal when the electrical signal meets a requirement; and

a second switching circuit 5 electrically connected to the second power supply circuit 200, for turning on the second power supply circuit 200 in accordance with the first signal; when the second power supply circuit 200 is turned on, the second power supply circuit 200 is in a formal on state, so that the second power supply 2 can supply power to the load circuit.

What needs to be added here is: the above pre-conduction is understood to be: the second power supply circuit 200 is turned on but the second power supply 2 does not supply power to the outside. The reason for this phenomenon is: when the first power supply 1 supplies power, even if the second power supply circuit 200 is turned on, the second power supply 2 cannot supply power to the outside due to the hardware property of the circuit itself, but it is a precondition that the supply voltage of the first power supply 1 is greater than or equal to the supply voltage of the second power supply 2.

The movable platform shown in fig. 3 is a schematic view of an unmanned aerial vehicle. The movable platform 800 includes: the camera comprises a body, a camera 820 arranged on the body, and a holder 810 arranged on the body. A camera 820 is arranged at the holder 810; the camera 820 is movable relative to the body by the holder 810. An inertial measurement unit (not shown) may also be provided on the fuselage. The movable platform may further include: a power system 830. The power system may include an electronic governor (referred to as an electric governor for short), one or more propellers, and one or more motors corresponding to the one or more propellers. Of course, the movable platform may include other elements or devices in addition to those listed above, which are not intended to be exemplary herein. The load circuit of the movable platform shown in fig. 3 is electrically connected with one or more motors corresponding to the propellers, an inertia measurement unit, a pan-tilt, a camera, and the like. The first power supply or the second power supply supplies power required for the operation of each element and device in the load circuit. The VCC _ SYS terminal in fig. 1 is used to electrically connect the load circuit.

What needs to be added here is: the power supply control circuit in the movable platform provided in this embodiment may be implemented by directly adopting the scheme provided in the above embodiments, and specific contents may refer to the above corresponding description, and are not described here again.

The technical solution provided by the present invention is described below with reference to a specific application example. Taking an electric unmanned aerial vehicle, in particular a heavy-load electric unmanned aerial vehicle as an example, the technical scheme provided by the embodiments is adopted to realize that: after the main battery (or the first power supply 1) is disconnected, the second battery (or the second power supply 2) is switched on rapidly, and the load is maintained to work continuously.

Wherein the second power supply 2 satisfies the following condition:

1. the supply voltage of the second power supply 2 is less than or equal to the supply voltage of the first power supply 1

2. Sufficient power may be provided to support unmanned aerial vehicle action.

The switching process is as follows:

after the unmanned aerial vehicle is started, the first power supply 1 starts to supply power for the unmanned aerial vehicle to act (such as flying). At this time, referring to fig. 1, the MCU of the unmanned aerial vehicle sends a second signal to the first MOS transistor switching circuit Q6 through the first isolation circuit 9 and the first driving circuit 6 to pre-turn on the second power supply 2 to access the second power supply circuit 200. Wherein, the MCU of the unmanned aerial vehicle is electrically connected with the EN1 end in FIG. 1.

After the unmanned aerial vehicle takes off and works, the first power supply is used for working.

If the first power supply 1 is interrupted during operation (for example, the supply voltage of the first power supply is less than the voltage threshold), the second power supply 2 first supplies power to the unmanned aerial vehicle through the parasitic diode D1 of the second MOS transistor switching circuit Q7, which may cause serious heat generation due to a large voltage drop of D1.

When the second power supply is powered by the D1, the operational amplifier U2 detects that the second power supply 2 starts outputting current through the first resistor R1, and the detected current exceeds the set threshold value through the comparator U1, and the comparator U1 outputs a first signal; the first signal passes through the second isolation circuit 8 and the second driving circuit to the second MOS switch circuit Q7, and the second MOS switch circuit Q7 is turned on. When the second battery supplies power to the system, the second MOS transistor switch circuit Q7 is required to be fully opened, so that the D1 voltage drop is reduced, the heat generation is reduced, and the Q7 is prevented from being damaged due to overheating.

After the second power supply 2 is started to supply power, the MCU controls the unmanned aerial vehicle to start a landing program. When the unmanned aerial vehicle lands, the output current of the second power supply is smaller than the set threshold value, and the second MOS tube switching circuit Q7 is automatically closed. After receiving the falling signal, the MCU will also turn off the first MOS switch circuit Q6 to complete the system power down.

Various aspects of the subject matter described herein are set forth in the following numbered clauses.

A1, a power supply control circuit, comprising:

A2, the power supply control circuit according to the above a1, wherein the first switch circuit comprises:

A3, the power supply control circuit based on the above 2, wherein the first switch circuit comprises a first MOS tube switch circuit.

A4, the power supply control circuit based on the A3, wherein the first MOS transistor switch circuit comprises an NMOS transistor switch circuit.

A5, the power supply control circuit according to the above A3,

the drain electrode of the first MOS tube switching circuit is electrically connected with the second switching circuit;

the source electrode of the first MOS tube switching circuit is electrically connected with the load circuit;

the grid electrode of the first MOS tube switching circuit is used for being electrically connected with a controller, and the controller is used for outputting a second signal when a first power supply supplies power so as to enable the first MOS tube switching circuit to be conducted and to conduct the second power supply circuit in advance.

A6, the power supply control circuit based on the A5, wherein a first isolation circuit is electrically connected between the grid of the first MOS tube switch circuit and the controller.

A7, the power supply control circuit based on the A5, wherein a first driving circuit is electrically connected between the grid of the first MOS tube switch circuit and the controller;

the first driving circuit is used for driving the first MOS tube switching circuit to be conducted according to the second signal.

A8, the power supply control circuit according to the above a7, further comprising: the isolation power supply module is used for providing working electric energy for the first driving circuit;

the first driving circuit is electrically connected with the second side end.

A9, the power supply control circuit based on the above A8, the isolated power supply module comprising:

the control chip is electrically connected to the load circuit; and

the isolation transformer is electrically connected with the control chip;

A10, the power supply control circuit based on any one of the above A1 to A9, the second switch circuit comprising:

A11, the power supply control circuit based on the A10, wherein the second switch circuit comprises a second MOS tube switch circuit.

A12, the power supply control circuit based on the A10, the second MOS transistor switch circuit comprises an NMOS transistor switch circuit.

A13, the power supply control circuit according to the above A11,

the drain electrode of the second MOS tube switching circuit is electrically connected with the first switching circuit;

the source electrode of the second MOS tube switching circuit is electrically connected with the second power supply;

and the grid electrode of the second MOS tube switching circuit is electrically connected with the detection circuit.

A14, the power supply control circuit based on any one of the above A1 to A9, the detection circuit comprising:

A15, the power supply control circuit according to the above a14, wherein the current detecting element is a first resistor.

A16, the power supply control circuit according to the above A14, wherein the detection circuit comprises:

A17, the power supply control circuit based on the A16, wherein a second isolation circuit is electrically connected between the second output end and the second switch circuit.

A18, the power supply control circuit according to the above a16, wherein a second driving circuit is electrically connected between the second output terminal and the second switching circuit;

A19, the power supply control circuit according to the above a18, further comprising: the isolation power supply module is used for providing working electric energy for the second driving circuit;

the second driving circuit is electrically connected with the second side end.

A20, the power supply control circuit according to any one of the above A1 to A9, wherein the first power supply is a main power supply and the second power supply is a backup power supply.

B21, a power supply control system, comprising:

the first power supply is electrically connected to the load circuit to form a first power supply circuit and is used for supplying power to the load circuit;

B22, the power supply control system according to the above B21, further comprising:

B23, the power supply control system according to the above B22, wherein the first switch circuit includes:

B24, the power supply control system according to the B22, wherein the first switch circuit comprises a first MOS transistor switch circuit.

B25, the power supply control system according to the B24, wherein the first MOS transistor switch circuit comprises an NMOS transistor switch circuit.

B26, the power supply control system according to the above B24,

and the grid electrode of the first MOS tube switching circuit is used for being electrically connected with the controller.

B27, the power supply control system according to the above B26, wherein a first isolation circuit is electrically connected between the gate of the first MOS transistor switch circuit and the controller.

B28, the power supply control system according to the above B26, wherein a first driving circuit is electrically connected between the gate of the first MOS tube switch circuit and the controller;

B29, the power supply control system according to the above B28, further comprising: the isolation power supply module is used for providing working electric energy for the first driving circuit;

the first driving circuit is electrically connected with the second side end.

B30, the power supply control system according to the above B29, wherein the isolated power supply module comprises:

the control chip is electrically connected to the load circuit; and

the isolation transformer is electrically connected with the control chip;

B31, the power supply control system based on any one of the above B21-B30, the second switch circuit includes:

B32, the power supply control system according to the B31, wherein the second switch circuit comprises a second MOS transistor switch circuit.

B33, the power supply control system according to the B32, wherein the second MOS transistor switch circuit comprises an NMOS transistor switch circuit.

B34, the power supply control system according to the above B32,

B35, the power supply control system based on any one of the above B21-B30, the detection circuit includes:

B36, the power supply control system according to the above B35, wherein the current detecting element is a first resistor.

B37, the power supply control system according to the above B35, wherein the detection circuit comprises:

B38, the power supply control system according to the above B37, wherein a second isolation circuit is electrically connected between the second output terminal and the second switch circuit.

B39, the power supply control system according to B37, wherein a second driving circuit is electrically connected between the second output terminal and the second switching circuit;

B40, the power supply control system according to the above B39, further comprising: the isolation power supply module is used for providing working electric energy for the second driving circuit;

the second driving circuit is electrically connected with the second side end.

B41, the power supply control system according to any one of the above B21-B30, wherein the first power supply is a main power supply, and the second power supply is a standby power supply.

C42, a movable platform comprising:

a body; and the number of the first and second groups,

the power supply control system according to any one of the above-mentioned items B21 to B41.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A power supply control circuit, comprising:

2. The power supply control circuit according to claim 1, wherein the first switch circuit comprises:

3. The power supply control circuit of claim 2 wherein the first switching circuit comprises a first MOS transistor switching circuit.

4. The power supply control circuit of claim 3 wherein the first MOS transistor switch circuit comprises an NMOS transistor switch circuit.

5. The power supply control circuit of claim 3,

6. The power supply control circuit of claim 5 wherein a first isolation circuit is electrically connected between the gate of the first MOS transistor switch circuit and the controller.

7. The power supply control circuit according to claim 5, wherein a first driving circuit is electrically connected between the gate of the first MOS transistor switch circuit and the controller;

8. The power supply control circuit of claim 7, further comprising: the isolation power supply module is used for providing working electric energy for the first driving circuit;

the first driving circuit is electrically connected with the second side end.

9. The power supply control circuit of claim 8 wherein the isolated power supply module comprises:

the control chip is electrically connected to the load circuit; and

the isolation transformer is electrically connected with the control chip;

10. The power supply control circuit according to any one of claims 1 to 9, wherein the second switching circuit includes:

11. The power supply control circuit of claim 10 wherein the second switching circuit comprises a second MOS transistor switching circuit.

12. The power supply control circuit of claim 11 wherein the second MOS transistor switch circuit comprises an NMOS transistor switch circuit.

13. The power supply control circuit of claim 11,

14. A power supply control system, comprising:

15. A movable platform, comprising:

a body; and the number of the first and second groups,

the power supply control system of claim 14.