CN220857696U - Multipath power supply switching circuit and engine control system - Google Patents

Abstract

The present invention relates to power supply technology. The invention aims to solve the problem of unstable power supply caused by unreasonable power supply switching devices in the control system of the existing engine, and provides a multipath power supply switching circuit and an engine control system, wherein the technical scheme of the multipath power supply switching circuit can be summarized as follows: the voltage output by the switching power supply module is communicated with the voltage output by the charging module and the voltage output by the storage battery module through the switching connection module, so that the switching power supply module, the charging module and the storage battery module can be connected together through the switching connection module to supply power for the output end of the multi-path power supply switching circuit, the situation of instant power failure can not occur any more at the moment of switching, the power supply stability of an engine control system is ensured, and a corresponding backflow preventing mechanism is provided through the switching connection module. The invention has the beneficial effects that the power supply is more stable, and the invention is suitable for the power supply of an engine control system.

Description

Multipath power supply switching circuit and engine control system

Technical Field

The present application relates to power technology, and in particular, to a multi-path power switching circuit.

Background

The control system of the engine needs stable direct current 24V power supply, and is generally matched with a switch power supply module and a storage battery module so as to ensure the reliability of the power supply of the control system. The existing motor-started engine is generally directly matched with the charging module and the storage battery module for starting the motor of the engine, but a power supply loop of the control system, the charging module and the storage battery module matched with the motor of the engine are mutually independent and are not connected, so that the relay is completely relied on when the power supply is switched, and the power supply is cut off and re-supplied in a moment due to action time of the relay, so that the power supply of the control system of the engine is unstable.

Disclosure of utility model

The application aims to solve the problem of unstable power supply caused by unreasonable power supply switching devices in the control system of the existing engine, and provides a multipath power supply switching circuit and an engine control system.

In a technical scheme adopted to solve the technical problems, the first aspect of the application provides a multi-path power supply switching circuit, which comprises a switching power supply module, a switching connection module, a charging module and a storage battery module;

The input end of the switching power supply module is used for being connected with an input power supply, and the output end of the switching power supply module is connected with the switching connection module;

The input end of the charging module is used for being connected with an input power supply, and the output end of the charging module is connected with the switching connection module;

the storage battery module is connected with the switching connection module, and the output end of the switching connection module is connected with the output end of the multi-path power supply switching circuit;

The switching connection module is used for communicating the voltage output by the switching power supply module with the voltage output by the charging module and the voltage output by the storage battery module, preventing the voltage output by the switching power supply module from flowing backwards into the charging module, preventing the voltage output by the switching power supply module from charging for the storage battery module, simultaneously enabling the voltage output by the charging module to charge for the storage battery module, preventing the voltage output by the charging module from flowing backwards into the switching power supply module, and providing corresponding switching functions when the switching power supply module and/or the charging module have no output voltage.

Specifically, in order to provide a switching connection module, the switching connection module includes: the switching power supply anti-backflow unit, the charging module anti-backflow unit, the switching unit and the voltage reduction unit;

the input end of the switching power supply backflow prevention unit is connected with the output end of the switching power supply module, and the output end of the switching power supply backflow prevention unit is connected with the output end of the switching connection module;

The input end of the charging module anti-backflow unit is connected with the output end of the charging module, and the output end of the charging module anti-backflow unit is connected with the storage battery module and the input end of the voltage reduction unit;

the output end of the voltage reduction unit is connected with the output end of the switching connection module;

The first control end of the switching unit is connected with the output end of the switching power supply module, the second control end of the switching unit is connected with the output end of the charging module, the storage battery module is connected with the output end of the switching connection module through the switching unit, and the switching unit is connected with the voltage reduction unit;

The switching unit is used for controlling the voltage reducing unit to reduce the voltage reducing amplitude when the input of the first control end is 0; when the inputs of the first control end and the second control end are both 0, the control storage battery module is directly connected with the output end of the switching connection module.

Further, to refine the step-down unit, the step-down unit includes: a first pressure reducing device and a second pressure reducing device;

The input end of the first voltage reducing device and the input end of the second voltage reducing device which are connected in series are used as the input end of the voltage reducing unit, and the output end of the first voltage reducing device and the output end of the second voltage reducing device which are connected in series are used as the output end of the voltage reducing unit.

Specifically, in order to refine the first voltage reducing device and the second voltage reducing device, the first voltage reducing device includes: a first diode and a second diode;

The anode of the first diode is used as an input end of the first voltage reducing device, the cathode of the first diode is connected with the anode of the second diode, and the cathode of the second diode is used as an output end of the first voltage reducing device;

The second pressure reducing device includes: a third diode and a fourth diode;

the positive electrode of the third diode is used as the input end of the second voltage reducing device, the negative electrode of the third diode is connected with the positive electrode of the fourth diode, and the negative electrode of the fourth diode is used as the output end of the second voltage reducing device.

Still further, in order to refine the switching unit, the switching unit includes: a first switching device and a second switching device;

the control end of the first switching device is used as a first control end of the switching unit, and two ends of a first action end of the first switching device are respectively connected with the input end of the first voltage reducing device and the output end of the first voltage reducing device;

The second action end of the first switching device is connected in series with the action end of the second switching device to serve as a switching action device, the first end of the switching action device is connected with the storage battery module, and the second end of the switching action device is connected with the output end of the switching connection module;

the control end of the second switching device is used as a second control end of the switching unit;

When the input of the control end of the first switching device is 0, the first action end and the second action end of the first switching device are closed, otherwise, the first action end and the second action end of the first switching device are opened;

When the control end input of the second switching device is 0, the action end of the second switching device is closed, otherwise, the action end of the second switching device is opened.

Specifically, to provide a first switching device and a second switching device, the first switching device includes: a first normally closed relay;

The control coil of the first normally closed relay is used as a control end of the first switching device, the first normally closed contact of the first normally closed relay is used as a first action end of the first switching device, and the second normally closed contact of the first normally closed relay is used as a second action end of the first switching device;

The second switching device includes: a second normally closed relay;

The control coil of the second normally closed relay is used as the control end of the second switching device, and the normally closed contact of the second normally closed relay is used as the action end of the second switching device.

Still further, for providing a switching power supply and prevent flowing backward the unit and charging module and prevent flowing backward the unit, then switching power supply prevents flowing backward the unit, include: a fifth diode;

the positive electrode of the fifth diode is used as the input end of the switching power supply backflow prevention unit, and the negative electrode of the fifth diode is used as the output end of the switching power supply backflow prevention unit;

the anti-backflow unit of the charging module comprises: a sixth diode;

The positive electrode of the sixth diode is used as the input end of the charging module anti-backflow unit, and the negative electrode of the sixth diode is used as the output end of the charging module anti-backflow unit.

Specifically, in order to protect the circuit from being destroyed, the multi-path power switching circuit further includes: the device comprises a first protection module, a second protection module and a third protection module;

The output end of the switching power supply module is connected with the switching connection module through the first protection module;

The output end of the charging module is connected with the switching connection module through the second protection module;

And the output end of the switching connection module is connected with the output end of the multi-path power supply switching circuit through the third protection module.

Still further, in order to provide a first protection module, a second protection module and a third protection module, the first protection module includes: a first fuse;

The first end of the first fuse is connected with the output end of the switching power supply module, and the second end of the first fuse is connected with the switching connection module;

The second protection module includes: a second fuse;

The first end of the second fuse is connected with the output end of the charging module, and the second end of the second fuse is connected with the switching connection module;

The third protection module includes: a third fuse;

the first end of the third fuse is connected with the output end of the switching connection module, and the second end of the third fuse is used as the output end of the multi-path power supply switching circuit.

In a second aspect of the present application, an engine control system is provided, which includes a multi-path power switching circuit as described above.

The application has the beneficial effects that in the scheme of the application, the switching connection module is utilized to communicate the voltage output by the switching power supply module with the voltage output by the charging module and the voltage output by the storage battery module, and a corresponding anti-backflow mechanism is provided, so that the switching power supply module, the charging module and the storage battery module can be connected together through the switching connection module to supply power for the output end of the multi-path power supply switching circuit, and the situation of instant power failure can not occur at the moment of switching, thereby ensuring the power supply stability of an engine control system.

Drawings

Fig. 1 is a schematic circuit diagram of a multi-path power switching circuit according to a first aspect of the present application.

Fig. 2 is a schematic diagram of another circuit configuration of the multi-path power switching circuit in fig. 1.

Fig. 3 is a schematic circuit diagram of an example of the multi-path power switching circuit of fig. 2.

Fig. 4 is a schematic circuit configuration diagram of an engine control system according to a second aspect of the embodiment of the present application.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Fig. 1 is a schematic circuit diagram of a multi-path power switching circuit according to a first aspect of the present application, and for convenience of explanation, only the portions related to the present embodiment are shown, which are described in detail below:

The multi-path power supply switching circuit in this embodiment includes: the switching power supply module 10, the switching connection module 40, the charging module 20, and the battery module 30.

The input end of the switching power supply module 10 is used for being connected with an input power supply AC, and the output end of the switching power supply module 10 is connected with the switching connection module 40.

The input end of the charging module 20 is used for being connected to an input power source AC, and the output end of the charging module 20 is connected to the switching connection module 40.

The storage battery module 30 is connected with the switching connection module 40, and the output end of the switching connection module 40 is connected with the output end DC of the multi-path power supply switching circuit;

Here, the switching connection module 40 is configured to communicate the voltage output by the switching power supply module 10 with the voltage output by the charging module 20 and the voltage output by the storage battery module 30, and prevent the voltage output by the switching power supply module 10 from flowing backward into the charging module 20, prevent the voltage output by the switching power supply module 10 from charging the storage battery module 30, and simultaneously enable the voltage output by the charging module 20 to charge the storage battery module 30, and prevent the voltage output by the charging module 20 from flowing backward into the switching power supply module 10, and provide a corresponding switching function when the switching power supply module 10 and/or the charging module 20 have no output voltage.

It can be understood that in the above embodiment, since the switching connection module 40 communicates the voltage output by the switching power supply module 10 with the voltage output by the charging module 20 and the voltage output by the storage battery module 30, the switching power supply module 10, the charging module 20 and the storage battery module 30 can be connected together through the switching connection module 40 to supply power to the output end of the multi-path power supply switching circuit, and the situation of instant power failure can not occur at the instant of switching, thereby ensuring the power supply stability of the engine control system.

And because the switching connection module 40 provides a corresponding anti-backflow mechanism, the voltage output by the switch power supply module 10 cannot flow backward into the charging module 20, the voltage output by the switch power supply module 10 cannot charge the storage battery module 30, meanwhile, the voltage output by the charging module 20 can charge the storage battery module 30, the voltage output by the charging module 20 cannot flow backward into the switch power supply module 10, and the voltage output by the storage battery module 30 cannot flow backward into the charging module 20 and the switch power supply module 10.

The input power AC is typically mains, i.e. 220V AC, while the engine control system is typically powered by 24V dc.

Referring to fig. 2, to provide a switching connection module 40, in one embodiment, the switching connection module 40 may include: the switching power supply backflow prevention unit 401, the charging module backflow prevention unit 402, the switching unit 403 and the voltage reduction unit 404.

The input end of the switching power supply backflow preventing unit 401 is connected with the output end of the switching power supply module 10, and the output end of the switching power supply backflow preventing unit 401 is connected with the output end of the switching connection module 40.

An input end of the charging module anti-backflow unit 402 is connected with an output end of the charging module 20, and an output end of the charging module anti-backflow unit 402 is connected with the storage battery module 30 and is connected with an input end of the voltage reduction unit 404.

An output terminal of the step-down unit 404 is connected to an output terminal of the switching connection module 40.

A first control terminal of the switching unit 403 is connected to an output terminal of the switching power supply module 10, a second control terminal of the switching unit 403 is connected to an output terminal of the charging module 20, the battery module 30 is connected to an output terminal of the switching connection module 40 through the switching unit 403, and the switching unit 403 is connected to the step-down unit 404.

Here, in the switching unit 403, when the first control terminal input is 0, the step-down unit 404 is controlled to decrease the step-down amplitude; when the inputs of the first control terminal and the second control terminal are both 0, the control battery module 30 is directly connected to the output terminal of the switching connection module 40.

It can be understood that the switching power supply anti-backflow unit 401 and the charging module anti-backflow unit 402 in this embodiment are used for preventing the voltage from flowing backward into the switching power supply module 10 and the charging module 20, so as to implement the anti-backflow mechanism.

Whereas the buck unit 404 functions as: the voltage output from the output end of the charging module 20 to the output end of the switching connection module 40 is reduced, so that the voltage output from the output end of the charging module 20 to the output end of the switching connection module 40 is slightly lower than the voltage output from the output end of the switching power supply module 10 to the output end of the switching connection module 40, and when the output end of the switching power supply module 10 outputs, the output of the multi-path power supply switching circuit is supplied by the switching power supply module 10.

The switching unit 403 functions in: when the first control terminal input is 0, that is, the output terminal of the switching power module 10 outputs 0, the step-down unit 404 is controlled to reduce the step-down amplitude, so that the output of the multi-path power switching circuit is supplied by the charging module 20. When the inputs of the first control end and the second control end are both 0, that is, the output end of the switch power module 10 outputs 0, and the output end of the charging module 20 outputs 0, the control storage battery module 30 is directly connected with the output end of the switching connection module 40, so that the output of the multi-path power supply switching circuit is directly supplied by the storage battery module 30.

Referring to fig. 3, to refine the buck unit 404, in one embodiment, the buck unit 404 may include: a first pressure reducing device 4041 and a second pressure reducing device 4042.

The input end of the first voltage reducing device 4041 and the second voltage reducing device 4042 connected in series is used as the input end of the voltage reducing unit 404, and the output end of the first voltage reducing device 4041 and the second voltage reducing device 4042 connected in series is used as the output end of the voltage reducing unit 404.

It will be appreciated that the step-down unit 404 is divided into two step-down devices in this embodiment, which is aimed at facilitating the control of the switching unit 403.

And the series connection of the first step-down device 4041 and the second step-down device 4042 may be: the input end of the first voltage reducing device 4041 is used as the input end of the voltage reducing unit 404, the output end of the first voltage reducing device 4041 is connected with the input end of the second voltage reducing device 4042, and the output end of the second voltage reducing device 4042 is used as the output end of the voltage reducing unit 404; or, the input end of the second voltage reducing device 4042 is taken as the input end of the voltage reducing unit 404, the output end of the second voltage reducing device 4042 is connected with the input end of the first voltage reducing device 4041, and the output end of the first voltage reducing device 4041 is taken as the output end of the voltage reducing unit 404.

Referring to fig. 3, to refine the first step-down device 4041 and the second step-down device 4042, in one embodiment, the first step-down device 4041 may include: a first diode D1 and a second diode D2.

The anode of the first diode D1 is used as the input end of the first step-down device 4041, the cathode of the first diode D2 is connected with the anode of the second diode D2, and the cathode of the second diode D2 is used as the output end of the first step-down device 4041.

The second pressure reducing means 4042 may include: third diode D3 and fourth diode D4.

The positive electrode of the third diode D3 is used as the input end of the second step-down device 4042, the negative electrode of the third diode D3 is connected with the positive electrode of the fourth diode D4, and the negative electrode of the fourth diode D4 is used as the output end of the second step-down device 4042.

It can be understood that in this embodiment, the voltage is reduced by using the voltage drop when the diode is turned on by using the diode as the first voltage reducing device 4041 and the second voltage reducing device 4042, and the voltage reduction amplitude is stable.

Referring to fig. 3, to refine the switching unit 403, in one embodiment, the switching unit 403 may include: the first switching device 4031 and the second switching device 4032.

The control end of the first switching device 4031 is used as a first control end of the switching unit 403, and two ends of a first operation end of the first switching device 4031 are respectively connected to an input end of the first voltage reducing device 4041 and an output end of the first voltage reducing device 4041.

The second operating end of the first switching device 4031 is connected in series with the operating end of the second switching device 4032 to serve as a switching device, the first end of the switching device is connected to the battery module 30, and the second end of the switching device is connected to the output end of the switching connection module 40.

The control terminal of the second switching means 4032 serves as a second control terminal of the switching unit 403.

Here, when the control terminal input of the first switching device 4031 is 0, the first action terminal and the second action terminal of the first switching device 4031 are closed, otherwise, the first action terminal and the second action terminal of the first switching device 4031 are opened;

When the control end input of the second switching device 4032 is 0, the action end of the second switching device 4032 is closed, otherwise, the action end of the second switching device 4032 is opened.

It can be understood that, in the present embodiment, since the two ends of the first operating end of the first switching device 4031 are respectively connected to the input end of the first voltage reducing device 4041 and the output end of the first voltage reducing device 4041, when the two ends of the first operating end are closed and conducted, the first voltage reducing device 4041 is shorted and disabled, so that only the second voltage reducing device 4042 remains to operate, thereby achieving the purpose of controlling the voltage reducing unit 404 to reduce the voltage reducing width.

As can be seen from the above description, since the second operating end of the first switching device 4031 is connected in series with the operating end of the second switching device 4032 to serve as a switching operating device, the battery module 30 can directly supply power to the output ends of the multiple power switching modules only when the second operating end of the first switching device 4031 and the operating end of the second switching device 4032 are both closed and conducted, so that the battery module 30 can be prevented from being directly connected to the output ends of the switching power module 10 to be charged.

Referring to fig. 3, to provide a first switching device 4031 and a second switching device 4032, in one embodiment, the first switching device 4031 may include: a first normally closed relay K1.

The control coil of the first normally closed relay K1 is used as the control end of the first switching device 4031, the first normally closed contact of the first normally closed relay K1 is used as the first action end of the first switching device 4031, and the second normally closed contact of the first normally closed relay K1 is used as the second action end of the first switching device 4031.

The second switching device 4032 may include: and a second normally closed relay K2.

The control coil of the second normally closed relay K2 is used as the control end of the second switching device 4032, and the normally closed contact of the second normally closed relay K2 is used as the action end of the second switching device 4032.

It can be understood that in the present embodiment, the first normally-closed relay K1 and the second normally-closed relay K2 can select the normally-closed relay with the shortest operation time, but the operation time of the first normally-closed relay K1 and the second normally-closed relay K2 may not be required due to the connection mode of the multi-path power switching circuit.

Referring to fig. 3, to provide a switching power supply anti-backflow unit 401 and a charging module anti-backflow unit 402, in one embodiment, the switching power supply anti-backflow unit 401 may include: and a fifth diode D5.

The positive electrode of the fifth diode D5 is used as the input end of the switching power supply anti-backflow unit 401, and the negative electrode of the fifth diode D5 is used as the output end of the switching power supply anti-backflow unit 401.

The charging module backflow preventing unit 402 may include: and a sixth diode D6.

The positive electrode of the sixth diode D6 is used as the input end of the charging module anti-backflow unit 402, and the negative electrode of the sixth diode D6 is used as the output end of the charging module anti-backflow unit 402.

It can be understood that in this embodiment, the anti-backflow unit 401 of the switching power supply and the anti-backflow unit 402 of the charging module are realized through the unidirectional conduction function of the diode, and the structure is simple.

Referring to fig. 3, to protect the circuit from being fused, in one embodiment, the multi-path power switching circuit may further include: the first protection module 50, the second protection module 60, and the third protection module 70.

The output terminal of the switching power supply module 10 is connected to the switching connection module 40 through the first protection module 50.

The output terminal of the charging module 20 is connected to the switching connection module 40 through the second protection module 60.

The output of the switching connection module 40 is DC-connected to the output of the multi-channel power switching circuit via a third protection module 70.

It can be appreciated that by adding the first protection module 50, the second protection module 60 and the third protection module 70, circuit protection is achieved to avoid fuse.

Referring to fig. 3, to provide a first protection module 50, a second protection module 60, and a third protection module 70, in one embodiment, the first protection module 50 may include: the first fuse FU1.

The first end of the first fuse FU1 is connected to the output terminal of the switching power supply module 10, and the second end of the first fuse FU1 is connected to the switching connection module 40.

The second protection module 60 may include: the second fuse FU2.

The first end of the second fuse FU2 is connected to the output terminal of the charging module 20, and the second end of the second fuse FU2 is connected to the switching connection module 40.

The third protection module 70 may include: the third fuse FU3.

The first end of the third fuse FU3 is connected to the output terminal of the switching connection module 40, and the second end of the third fuse FU3 serves as the output terminal DC of the multi-path power switching circuit.

It can be appreciated that in the present embodiment, the functions of the first protection module 50, the second protection module 60 and the third protection module 70 are realized through the first fuse FU1, the second fuse FU2 and the third fuse FU3, and the structure is simple and easy to realize.

In one embodiment, referring to fig. 3, since the switching power supply anti-backflow unit 401 employs the fifth diode D5, and the diode itself has a certain voltage drop (typically 0.7V), the voltage output by the output terminal of the switching power supply module 10 is preferably stable at 24.7V for the purpose of outputting the voltage at the output terminal of the multi-path power supply switching circuit to be 24V.

And the charging module 20 is used as a backup power source for the engine control system, and the output voltage is typically 24V-27V.

The battery module 30 serves as an emergency power source for the engine control system and has an output voltage of typically 24V-26V.

The first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5 and the sixth diode D6 may be silicon diodes, and the voltage drops in the forward conduction are all 0.7V.

Then there are:

When the switching power supply module 10, the charging module 20 and the storage battery module 30 all work normally, the control coils of the first normally-closed relay K1 and the second normally-closed relay K2 are all electrified, so that the normally-closed contacts of the first normally-closed relay K1, the second normally-closed contact and the second normally-closed relay K2 are all disconnected. At this time, the output voltage of the switching power module 10 is reduced by the fifth diode D5, and then the voltage output to the output terminal of the switching connection module 40 is 24V. The voltages output from the charging module 20 and the battery module 30 to the input end of the voltage reduction unit 404 are 24V-26.3V, and the voltages output to the output end of the switching connection module 40 after the voltage reduction of the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 in the voltage reduction unit 404 are 21.2V-23.5V. Since the voltage output from the switching power supply module 10 to the output terminal of the switching connection module 40 is higher than the voltage output from the charging module 20 and the storage battery module 30 to the output terminal of the switching connection module 40, the output voltage of the multi-path power supply switching circuit is 24V at this time, and the power is supplied by the switching power supply module 10. And the problem that the 24V output voltage is reversely sent to the charging module 20 and/or the storage battery module 30 is also not existed due to the existence of the first diode D1, the second diode D2, the third diode D3, the fourth diode D4 and the sixth diode D6.

If the switching power supply module 10 is suddenly damaged, and the charging module 20 and the storage battery module 30 are in normal operation, because the first normally closed relay K1 has an operation time, the control coil of the first normally closed relay K1 is powered off, and the first normally closed contact and the second normally closed contact are not closed yet. At this time, the voltages output from the charging module 20 and the battery module 30 to the input end of the voltage reduction unit 404 are 24V-26.3V, and after the voltage is reduced by the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 in the voltage reduction unit 404, the voltage output to the output end of the switching connection module 40 is 21.2V-23.5V, which is still within the voltage application range of the engine control system. At this time, the voltage output from the switching power supply module 10 to the output end of the switching connection module 40 is lower than the voltage output from the charging module 20 and the storage battery module 30 to the output end of the switching connection module 40, so that the output voltage of the multi-path power supply switching circuit is 21.2V-23.5V, and the charging module 20 and the storage battery module 30 supply power. And there is no problem that the output voltage is fed back to the switching power supply module 10 due to the fifth diode D5. When the first normally-closed contact and the second normally-closed contact of the first normally-closed relay K1 are closed and conducted, the voltage from the output ends of the charging module 20 and the storage battery module 30 to the output end of the switching connection module 40 should be 22.6V-24.9V, and still be in the voltage application range of the engine control system, so as to complete the power supply switching.

If the switching power supply module 10 works normally, the storage battery module 30 works normally, and when the charging module 20 is suddenly damaged, the voltage output from the switching power supply module 10 to the output end of the switching connection module 40 is higher than the voltage output from the charging module 20 and the storage battery module 30 to the output end of the switching connection module 40 no matter whether the first normally closed relay K1 and/or the second normally closed relay K2 act or not at this time, because the switching power supply module 10 works normally, the output voltage of the multi-path power supply switching circuit is 24V, and the switching power supply module 10 supplies power. At this time, when the control coil of the second normally-closed relay K2 is not powered down and the normally-closed contact is not closed yet, the 24V output voltage is not fed back to the charging module 20 and/or the battery module 30 due to the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, and the sixth diode D6. When the normally closed contact of the second normally closed relay K2 is closed and turned on, the second normally closed contact of the first normally closed relay K1 is still opened, so that the battery module 30 is not directly connected to the output end of the switching connection module 40, and the problem that the 24V output voltage is fed back to the charging module 20 and/or the battery module 30 is also not existed because of the first diode D1, the second diode D2, the third diode D3, the fourth diode D4 and the sixth diode D6.

If the switching power supply module 10 is suddenly damaged, the charging module 20 is damaged, and when the battery module 30 is operating normally, because there is an operation time of the first normally closed relay K1, the control coil of the first normally closed relay K1 is powered off, and the first normally closed contact and the second normally closed contact are not closed yet. At this time, after the output of the battery module 30 is reduced by the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 in the voltage reducing unit 404, the voltage output to the output end of the switching connection module 40 is 21.2V-23.2V, which is still within the voltage application range of the engine control system. At this time, the voltage output from the switching power supply module 10 to the output end of the switching connection module 40 is lower than the voltage output from the battery module 30 to the output end of the switching connection module 40, so that the output voltage of the multi-path power supply switching circuit is 21.2V-23.2V at this time, and the battery module 30 supplies power. And, due to the fifth diode D5 and the sixth diode D6, there is no problem that the output voltage is fed back to the switching power supply module 10 and no problem that the output voltage of the storage battery is fed back to the charging module 20. When the first normally-closed contact and the second normally-closed contact of the first normally-closed relay K1 are closed and conducted (because the charging module 20 is damaged, i.e. the normally-closed contact of the second normally-closed relay K2 is closed and conducted already), the voltage from the output end of the storage battery module 30 to the output end of the switching connection module 40 should be 24V-26V, and still be in the voltage application range of the engine control system, so that the emergency use of the engine control system can be satisfied, and the power supply switching is completed.

If the switching power supply module 10 is damaged, the charging module 20 is suddenly damaged, and the battery module 30 is normally operated, because there is an operation time of the second normally closed relay K2, the control coil of the second normally closed relay K2 is powered off, and the normally closed contact thereof is not closed. At this time, after the output of the battery module 30 is reduced by the third diode D3 and the fourth diode D4 in the voltage reducing unit 404 (because the first normally closed contact and the second normally closed contact of the first normally closed relay K1 are closed, the first diode D1 and the second diode D2 are not in short circuit), the voltage output to the output end of the switching connection module 40 is 22.6V-24.6V, and is still in the voltage application range of the engine control system. At this time, the voltage output from the switching power supply module 10 to the output end of the switching connection module 40 is lower than the voltage output from the storage battery module 30 to the output end of the switching connection module 40, so that the output voltage of the multi-path power supply switching circuit is 22.6V-24.6V at this time, and the storage battery module 30 supplies power. And, due to the fifth diode D5 and the sixth diode D6, there is no problem that the output voltage is fed back to the switching power supply module 10 and no problem that the output voltage of the storage battery is fed back to the charging module 20. When the normally closed contact of the second normally closed relay K2 is closed and turned on (because the switching power supply module 10 is damaged, that is, the second normally closed contact of the first normally closed relay K1 is already closed and turned on), the voltage from the output end of the storage battery module 30 to the output end of the switching connection module 40 should be 24V-26V, and the voltage is still in the voltage application range of the engine control system, so that the emergency use of the engine control system can be satisfied, and the power supply switching is completed.

If the mains supply is lost (i.e. the output voltages of the switching power supply module 10 and the charging module 20 suddenly disappear), the control coil of the first normally-closed relay K1 is powered off, the first normally-closed contact and the second normally-closed contact of the first normally-closed relay K1 are not closed, the control coil of the second normally-closed relay K2 is powered off, and the normally-closed contacts of the second normally-closed relay K2 are not closed due to the action time of the first normally-closed relay K1 and the second normally-closed relay K2. At this time, after the output of the battery module 30 is reduced by the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 in the voltage reducing unit 404, the voltage output to the output end of the switching connection module 40 is 21.2V-23.2V, which is still within the voltage application range of the engine control system. At this time, the voltage output from the switching power supply module 10 to the output end of the switching connection module 40 is lower than the voltage output from the battery module 30 to the output end of the switching connection module 40, so that the output voltage of the multi-path power supply switching circuit is 21.2V-23.2V at this time, and the battery module 30 supplies power. And, due to the fifth diode D5 and the sixth diode D6, there is no problem that the output voltage is fed back to the switching power supply module 10 and no problem that the output voltage of the storage battery is fed back to the charging module 20. When the second normally-closed contact of the first normally-closed relay K1 and the normally-closed contact of the second normally-closed relay K2 are closed and conducted, the voltage from the output end of the storage battery module 30 to the output end of the switching connection module 40 is 24V-26V, and the voltage is still in the voltage application range of the engine control system, so that emergency use of the engine control system can be met, and power supply switching is completed.

Fig. 4 is a schematic circuit diagram of a generator control system according to a second aspect of the embodiment of the present application, and for convenience of explanation, only a portion related to the present embodiment is shown, and the details are as follows:

The engine control system in the present embodiment includes: such as the multi-path power switching circuit described above.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims (10)

1. The multichannel power switching circuit, its characterized in that includes: the device comprises a switch power supply module, a switching connection module, a charging module and a storage battery module;

The input end of the switching power supply module is used for being connected with an input power supply, and the output end of the switching power supply module is connected with the switching connection module;

The input end of the charging module is used for being connected with an input power supply, and the output end of the charging module is connected with the switching connection module;

the storage battery module is connected with the switching connection module, and the output end of the switching connection module is connected with the output end of the multi-path power supply switching circuit;

The switching connection module is used for communicating the voltage output by the switching power supply module with the voltage output by the charging module and the voltage output by the storage battery module, preventing the voltage output by the switching power supply module from flowing backwards into the charging module, preventing the voltage output by the switching power supply module from charging for the storage battery module, simultaneously enabling the voltage output by the charging module to charge for the storage battery module, preventing the voltage output by the charging module from flowing backwards into the switching power supply module, and providing corresponding switching functions when the switching power supply module and/or the charging module have no output voltage.

2. The multi-way power switching circuit of claim 1 wherein said switching connection module comprises: the switching power supply anti-backflow unit, the charging module anti-backflow unit, the switching unit and the voltage reduction unit;

the input end of the switching power supply backflow prevention unit is connected with the output end of the switching power supply module, and the output end of the switching power supply backflow prevention unit is connected with the output end of the switching connection module;

The input end of the charging module anti-backflow unit is connected with the output end of the charging module, and the output end of the charging module anti-backflow unit is connected with the storage battery module and the input end of the voltage reduction unit;

the output end of the voltage reduction unit is connected with the output end of the switching connection module;

The first control end of the switching unit is connected with the output end of the switching power supply module, the second control end of the switching unit is connected with the output end of the charging module, the storage battery module is connected with the output end of the switching connection module through the switching unit, and the switching unit is connected with the voltage reduction unit;

The switching unit is used for controlling the voltage reducing unit to reduce the voltage reducing amplitude when the input of the first control end is 0; when the inputs of the first control end and the second control end are both 0, the control storage battery module is directly connected with the output end of the switching connection module.

3. The multi-path power switching circuit according to claim 2, wherein the step-down unit includes: a first pressure reducing device and a second pressure reducing device;

The input end of the first voltage reducing device and the input end of the second voltage reducing device which are connected in series are used as the input end of the voltage reducing unit, and the output end of the first voltage reducing device and the output end of the second voltage reducing device which are connected in series are used as the output end of the voltage reducing unit.

4. A multi-way power switching circuit as recited in claim 3 wherein said first step-down means comprises: a first diode and a second diode;

The anode of the first diode is used as an input end of the first voltage reducing device, the cathode of the first diode is connected with the anode of the second diode, and the cathode of the second diode is used as an output end of the first voltage reducing device;

The second voltage reducing device comprises a third diode and a fourth diode;

the positive electrode of the third diode is used as the input end of the second voltage reducing device, the negative electrode of the third diode is connected with the positive electrode of the fourth diode, and the negative electrode of the fourth diode is used as the output end of the second voltage reducing device.

5. A multi-way power switching circuit according to claim 3, wherein said switching unit comprises: a first switching device and a second switching device;

the control end of the first switching device is used as a first control end of the switching unit, and two ends of a first action end of the first switching device are respectively connected with the input end of the first voltage reducing device and the output end of the first voltage reducing device;

The second action end of the first switching device is connected in series with the action end of the second switching device to serve as a switching action device, the first end of the switching action device is connected with the storage battery module, and the second end of the switching action device is connected with the output end of the switching connection module;

the control end of the second switching device is used as a second control end of the switching unit;

When the input of the control end of the first switching device is 0, the first action end and the second action end of the first switching device are closed, otherwise, the first action end and the second action end of the first switching device are opened;

When the control end input of the second switching device is 0, the action end of the second switching device is closed, otherwise, the action end of the second switching device is opened.

6. The multi-way power switching circuit of claim 5 wherein said first switching means comprises: a first normally closed relay;

The control coil of the first normally closed relay is used as a control end of the first switching device, the first normally closed contact of the first normally closed relay is used as a first action end of the first switching device, and the second normally closed contact of the first normally closed relay is used as a second action end of the first switching device;

The second switching device includes: a second normally closed relay;

The control coil of the second normally closed relay is used as the control end of the second switching device, and the normally closed contact of the second normally closed relay is used as the action end of the second switching device.

7. The multi-path power supply switching circuit according to claim 2, wherein the switching power supply anti-backflow unit comprises: a fifth diode;

the positive electrode of the fifth diode is used as the input end of the switching power supply backflow prevention unit, and the negative electrode of the fifth diode is used as the output end of the switching power supply backflow prevention unit;

the anti-backflow unit of the charging module comprises: a sixth diode;

The positive electrode of the sixth diode is used as the input end of the charging module anti-backflow unit, and the negative electrode of the sixth diode is used as the output end of the charging module anti-backflow unit.

8. The multi-path power switching circuit of any one of claims 1-7, further comprising: the device comprises a first protection module, a second protection module and a third protection module;

The output end of the switching power supply module is connected with the switching connection module through the first protection module;

The output end of the charging module is connected with the switching connection module through the second protection module;

And the output end of the switching connection module is connected with the output end of the multi-path power supply switching circuit through the third protection module.

9. The multi-path power switching circuit of claim 8, wherein the first protection module comprises: a first fuse;

The first end of the first fuse is connected with the output end of the switching power supply module, and the second end of the first fuse is connected with the switching connection module;

The second protection module includes: a second fuse;

The first end of the second fuse is connected with the output end of the charging module, and the second end of the second fuse is connected with the switching connection module;

The third protection module includes: a third fuse;

the first end of the third fuse is connected with the output end of the switching connection module, and the second end of the third fuse is used as the output end of the multi-path power supply switching circuit.

10. An engine control system comprising a multi-way power switching circuit as claimed in any one of claims 1 to 9.