A power supply circuit and a working machine

Abstract

The present invention provides a power supply circuit and a working machine, belonging to the field of power electronics technology, including: the coil of the charging wake-up relay is connected to the charging wake-up port of the VCU; the VCU is communicatively connected to the charger, and the delay power-off port of the VCU is connected to the coil of the electromagnetic power supply relay; the normally open contact of the electromagnetic power supply relay is connected to the battery and the chassis power distribution box; the normally open contact of the charging wake-up relay is connected to the constant power output bus and the charging wake-up bus; when the VCU determines that there is an input signal at the charging detection port, a positive voltage is synchronously output at the charging wake-up port and the delay power-off port. By setting the charging wake-up relay and the electromagnetic power supply relay, the present invention can still charge the vehicle after disconnecting the main power switch, and can automatically disconnect the main power after the vehicle charging is completed, avoiding the situation of power loss of each module when the vehicle is parked for a long time after charging is completed, and the staff does not need to monitor the entire charging process, saving manpower.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronics, and in particular to a power supply circuit and an operating machine. Background Art

[0002] With the increasing development of energy technology, the demand for electric working machinery is also increasing.

[0003] During the charging process of current electric working machinery, the main power switch of the power circuit needs to be kept in a closed state before the vehicle can be charged.

[0004] In addition, if the main power switch of the power circuit is not disconnected in time after the operating machine is charged, the modules are prone to power outage when the vehicle is parked for a long time. Therefore, after charging is completed, the staff needs to manually disconnect the main power switch of the power circuit, which has the defects of cumbersome charging process and requires a certain amount of manpower on duty, which also affects the working life of each module to a certain extent. Summary of the invention

[0005] The present invention provides a power supply circuit and an operating machine, which are used to solve the defects in the prior art that the charging process is complicated and the risk of power failure may occur if the main power switch is not disconnected in time after charging is completed.

[0006] In the first aspect, the present invention provides a power supply circuit, including a charging wake-up relay and an electromagnetic power supply relay; the positive pole of the coil of the charging wake-up relay is connected to the charging wake-up port of the vehicle controller VCU; the charging detection port of the VCU is communicated with the charger, and the delayed power-off port of the VCU is connected to the positive pole of the coil of the electromagnetic power supply relay; a group of normally open contacts of the electromagnetic power supply relay are connected to the positive pole of the battery and the power input bus of the chassis power distribution box; a group of normally open contacts of the charging wake-up relay are connected to the normal power output bus and the charging wake-up bus; the negative pole of the coil of the charging wake-up relay, the negative pole of the coil of the electromagnetic power supply relay and the negative pole of the battery are connected; when the VCU determines that there is an input signal at the charging detection port, the VCU synchronously outputs a positive voltage at the charging wake-up port and the delayed power-off port, and the input signal is generated when the charging current of the current charging port of the charger is greater than the preset current.

[0007] According to a power supply circuit provided by the present invention, it also includes an ignition lock, an ACC power supply relay, an IG1 power supply relay and an IG2 power supply relay; the positive electrode of the battery is connected to the normal power output bus of the power supply circuit through a first thermal circuit breaker, and the first common end and the second common end of the ignition lock are connected to the normal power output bus through a second thermal circuit breaker; the ACC power supply output port of the ignition lock is connected to the positive pole of the coil of the ACC power supply relay, and a group of normally open contacts of the ACC power supply relay are respectively connected to the normal power output bus and the ACC power supply output bus of the power supply circuit; the IG1 power supply output port of the ignition lock is connected to the positive pole of the coil of the IG1 power supply relay, and a group of normally open contacts of the IG1 power supply relay are respectively connected to the normal power output bus and the IG1 power supply output bus of the power supply circuit; the IG2 power supply output port of the ignition lock is connected to the positive pole of the coil of the IG2 power supply relay, and a group of normally open contacts of the IG2 power supply relay are respectively connected to the normal power output bus and the the IG2 power output bus of the power supply circuit; when the conversion switch of the ignition lock is switched to the LOCK gear, the first common terminal and the second common terminal are all in a disconnected state with the ACC power output port, the IG1 power output port and the IG2 power output port; when the conversion switch of the ignition lock is switched to the ACC gear, the first common terminal is connected to the ACC power output port; when the conversion switch of the ignition lock is switched to the ON gear, the first common terminal is connected to the ACC power output port and the IG1 power output port, and the second common terminal is connected to the IG2 power output port; the IG1 power output port is connected to the low-voltage electrical port of the VCU; when the conversion switch of the ignition lock is switched to the ST gear, the first common terminal is connected to the IG1 power output port, and the second common terminal is connected to the ST power output port of the ignition lock; the ST power output port is connected to the low-voltage electrical port of the VCU.

[0008] According to a power supply circuit provided by the present invention, the charging wake-up port of the battery management system BMS, the charging wake-up port of the vehicle networking control unit TCU, the charging wake-up port of the all-in-one controller and the charging wake-up port of the instrument controller are respectively connected to the charging wake-up bus.

[0009] According to a power supply circuit provided by the present invention, the low-voltage electrical port of the all-in-one controller is connected to the cathode of the first diode and the cathode of the second diode, the anode of the first diode is connected to the charging wake-up bus, and the anode of the second diode is connected to the IG1 power output bus; the low-voltage electrical port of the battery management system BMS is connected to the cathode of the third diode and the cathode of the fourth diode, the anode of the third diode is connected to the charging wake-up bus, and the anode of the fourth diode is connected to the IG1 power output bus; the low-voltage electrical port of the instrument controller is connected to the cathode of the fifth diode and the cathode of the sixth diode, the anode of the fifth diode is connected to the charging wake-up bus, and the anode of the sixth diode is connected to the IG1 power output bus.

[0010] According to a power supply circuit provided by the present invention, the delayed power-off port of the VCU is connected to the anode of the seventh diode, and the cathode of the seventh diode is connected to the anode of the coil of the electromagnetic power supply relay.

[0011] A power supply circuit provided according to the present invention further includes an eighth diode; the anode of the eighth diode is connected to the IG1 power output port of the ignition lock, and the cathode of the eighth diode is connected to the anode of the coil of the electromagnetic power relay.

[0012] According to a power supply circuit provided by the present invention, the normal power input port of the vehicle network control unit TCU is connected to the normal power output bus through the third thermal circuit breaker; the normal power input port of the VCU is connected to the normal power output bus through the fourth thermal circuit breaker; the normal power input port of the BMS is connected to the normal power output bus through the fifth thermal circuit breaker; the normal power input port of the all-in-one controller is connected to the normal power output bus through the sixth thermal circuit breaker; the normal power input port of the instrument controller is connected to the normal power output bus through the seventh thermal circuit breaker.

[0013] According to a power supply circuit provided by the present invention, the power input bus of the chassis power distribution box is connected to the first switch electrical output bus of the power supply circuit through an eighth thermal circuit breaker, and is connected to the second switch electrical output bus of the power supply circuit through a ninth thermal circuit breaker.

[0014] According to a power supply circuit provided by the present invention, the intelligent power replenishment detection port of the VCU is connected to the positive electrode of the ninth diode, and the negative electrode of the ninth diode is connected to the positive electrode of the coil of the charging wake-up relay; when the VCU determines that the whole vehicle is in the intelligent power replenishment state, the VCU outputs a positive voltage at the intelligent power replenishment detection port.

[0015] In a second aspect, the present invention further provides a working machine, comprising a power supply circuit as described in any one of the above.

[0016] The power supply circuit and the working machine provided by the present invention can charge the vehicle even after the main power switch is disconnected by setting a charging wake-up relay and an electromagnetic power relay, and can automatically disconnect the main power after the vehicle charging is completed, avoiding the situation of power shortage in each module when the vehicle is parked for a long time after charging, and the staff does not need to monitor the entire charging process, saving manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is the circuit diagram of the power supply circuit provided by the present invention;

[0019] Figure 2 is the schematic diagram of the control flow for controlling the working machine to start charging by using the power supply circuit provided by the present invention;

[0020] Figure 3 is the schematic diagram of the control flow for controlling the working machine to end charging by using the power supply circuit provided by the present invention;

[0021] Figure 4 is the schematic diagram of the control flow for controlling the working machine under abnormal power failure by using the power supply circuit provided by the present invention;

[0022] Figure 5 is the schematic diagram of the control flow for controlling the working machine to be powered on by using the power supply circuit provided by the present invention;

[0023] Figure 6 is the schematic diagram of the control flow for controlling the working machine to be powered off by using the power supply circuit provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the objectives, technical solutions and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention with reference to the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0025] It should be noted that in the description of the embodiments of the present invention, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element. The orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. Unless otherwise expressly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The terms "first", "second", etc. in this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are usually of the same category, and the number of objects is not limited. For example, the first object can be one or multiple.

[0027] The power supply circuit provided by the present invention can be applied to some working machines such as pure electric working machines and hybrid electric working machines, for example: electric sanitation vehicles, electric mixer trucks, etc. In the subsequent embodiments, electric vehicles will be taken as examples for illustration, and will not be elaborated.

[0028] Figure 1 is the circuit diagram of the power supply circuit provided by the present invention, as Figure 1 shown. Compared with the existing power supply circuit, it mainly includes a charging wake-up relay and an electromagnetic power relay.

[0029] Among them, the positive pole of the coil of the charging wake-up relay is connected to the charging wake-up port of the vehicle control unit (VCU).

[0030] The charging detection port of the VCU is communicatively connected to the charger, and the delayed power-off port of the VCU is connected to the positive pole of the coil of the electromagnetic power relay.

[0031] A set of normally open contacts of the electromagnetic power relay connects the positive pole of the battery and the power input bus of the chassis power distribution box.

[0032] A group of normally open contacts of the charging wake-up relay connects the normal power output bus and the charging wake-up bus.

[0033] The negative pole of the coil of the charging wake-up relay, the negative pole of the coil of the electromagnetic power supply relay and the negative pole of the battery are connected.

[0034] It should be noted that when the VCU determines that there is an input signal at the charging detection port, it synchronously outputs a positive voltage at the charging wake-up port and the delayed power-off port. The input signal is generated when the charging current of the current charging port of the charger is greater than the preset current.

[0035] Specifically, the VCU is the central control unit of the electric vehicle and the core of the entire control system of the electric vehicle. It can communicate with the charger through the charging detection port, and then determine whether the electric vehicle is being charged according to the size of the charging current of the charging port. The preset current is predetermined according to the specific scenario requirements, and is generally taken as a current value slightly greater than 0A, such as 0.1A.

[0036] Optionally, Figure 2 FIG. 1 is a schematic diagram of a control flow of using the power supply circuit provided by the present invention to control the operation machine to start charging. Figure 2 As shown, including but not limited to the following steps:

[0037] When the electric vehicle starts to be charged, the charging gun on the charger is connected to the charging port of the electric vehicle, so that a charging current is generated at the charging port.

[0038] The Battery Management System (BMS) starts to detect whether the battery of the electric vehicle is in a fully charged state (such as determining that the battery power is greater than a certain threshold). If the battery of the electric vehicle is already fully charged, the battery will not be charged.

[0039] The threshold used to determine whether the battery is in a fully charged state may be 100%, or may be a preset threshold, such as 95%.

[0040] If the BMS detects that the battery of the electric vehicle is not fully charged, it starts charging the battery. At this time, the charging current generated at the charging port can be further detected by the VCU to indicate whether the electric vehicle has started charging.

[0041] Specifically, it can be determined whether the above charging current is greater than a preset current. If the charging current at the charging port is greater than the preset current, it can be determined that the electric vehicle has started charging; if the charging current at the charging port is less than the preset current, it indicates that the battery of the electric vehicle is not being charged currently, or there is no need to charge the battery of the electric vehicle.

[0042] When the VCU determines that the electric vehicle has started charging, a signal will be output at the charging wake-up port of the VCU.

[0043] Optionally, the signal output by the above charging stop port can be a positive voltage signal.

[0044] Since the positive pole of the coil of the charging wake-up relay is connected to the charging wake-up port of the VCU, when the charging wake-up port of the VCU starts to output a positive voltage, the coil of the charging wake-up relay is energized, and thus each set of normally open contacts of the charging stop relay will close.

[0045] After each set of normally open contacts of the charging stop relay closes, the constant power output bus and the charging wake-up bus will be connected through one set of closed normally open contacts of the charging stop relay, so that the charging wake-up bus is energized. Among them, the fifteenth thermal circuit breaker F15 can effectively protect the safe operation of the circuit.

[0046] In addition, when the delayed power-off port of the VCU starts to output a positive voltage, the coil of the electromagnetic power relay is energized, and thus each set of normally open contacts of the charging stop relay will close.

[0047] Since one set of normally open contacts of the electromagnetic power relay are respectively connected to the positive pole of the storage battery and the power input bus of the chassis power distribution box, when this set of normally open contacts of the electromagnetic power relay closes, the storage battery starts to supply power to the power input bus of the chassis power distribution box.

[0048] After the power input bus of the chassis power distribution box is connected to the storage battery, the chassis power distribution box starts to distribute power to the electric vehicle. For example: the power input bus of the chassis power distribution box can be connected to the dual-source pump port through the twelfth thermal circuit breaker F12 to distribute power to the dual-source pump, can also be connected to the cab flip port through the eleventh thermal circuit breaker F11 to distribute power to the cab flip-related devices, and can also be connected to the upper rotation reserved port through the tenth thermal circuit breaker F10 to distribute power to the relevant devices. Among them, the twelfth thermal circuit breaker F12, the eleventh thermal circuit breaker F11, and the tenth thermal circuit breaker F10 can effectively protect the safe operation of the circuit.

[0049] At this time, after the chassis power distribution box completes the power distribution for the electric vehicle, it starts to charge the electric vehicle battery according to the charging strategy, where the charging strategy can be preset according to the specific scenario usage requirements. For example, the charging strategy can be set to 3-hour DC fast charging or 5-hour AC / DC slow charging, etc.

[0050] During the process of charging the electric vehicle battery, the BMS can periodically detect whether the electric vehicle battery is in a fully charged state, that is, determine whether the electric vehicle battery has been fully charged.

[0051] If the BMS detects that the electric vehicle battery is not in a fully charged state, it continues to charge the electric vehicle battery according to the charging strategy; if the BMS detects that the electric vehicle battery is already in a fully charged state, the VCU can remotely communicate to inform the charger that the electric vehicle battery is fully charged and the charging can be ended.

[0052] Optionally, Figure 3 is a schematic diagram of the control process for using the power circuit provided by the present invention to control the operation machine to end charging, as Figure 3 shown, including but not limited to the following steps:

[0053] When the BMS detects that the electric vehicle battery is already in a fully charged state, the VCU will remotely communicate to inform the charger that it can end the charging of the electric vehicle.

[0054] At this time, the charging wake-up port and the delay power-off port of the VCU stop outputting positive voltage signals.

[0055] When the charging wake-up port of the VCU stops outputting a positive voltage signal, it will cause the coil of the charging wake-up relay to lose power, and each set of normally open contacts of the charging wake-up relay returns to the open state.

[0056] When each set of normally open contacts of the charging wake-up relay returns to the open state, the charging wake-up bus is disconnected from the constant power output bus, so that the charging wake-up bus loses power.

[0057] When the delay power-off port of the VCU stops outputting a positive voltage signal, it will cause the coil of the electromagnetic power relay to lose power, and each set of normally open contacts of the electromagnetic power relay returns to the open state.

[0058] When each set of normally open contacts of the electromagnetic power relay returns to the open state, the battery stops supplying power to the power input bus of the chassis power distribution box, so that except for the equipment in the constant power control mode of the electric vehicle, other electrical equipment is powered off, and the charging of the electric vehicle battery ends.

[0059] Currently, for existing electric vehicles, when charging the vehicle battery, the main power switch of the power supply circuit needs to be kept closed to enable vehicle battery charging. After charging is completed, a staff member needs to manually disconnect the main power switch of the power supply circuit. Moreover, if the main power switch of the power supply circuit is not timely disconnected after the electric vehicle is fully charged, there is a risk of power loss in each module when the vehicle is parked for a long time. Therefore, there are defects such as a cumbersome charging process and the need for a certain amount of manual supervision.

[0060] For example, after an existing electric sanitation vehicle finishes its operation, when the sanitation worker drives the electric sanitation vehicle back to the charger, the main power switch needs to be closed, and a staff member needs to wait for the electric sanitation vehicle to finish charging and then disconnect the main power switch, which wastes a lot of time and manpower. In addition, if the main power switch of the power supply circuit is not timely disconnected after the electric sanitation vehicle is fully charged, and the vehicle is parked for a long time without disconnecting the main power switch, there is a risk of power loss in each module.

[0061] However, for the power supply circuit provided by the present invention, by setting a charging wake-up relay and an electromagnetic power relay, when charging an electric vehicle, after the BMS detects that the charging current at the charging port is greater than the preset current, a positive voltage signal is synchronously output to the charging wake-up port and the delayed power-off port of the VCU, thereby enabling the coils of the charging wake-up relay and the electromagnetic power relay to be energized.

[0062] When the coils of the charging wake-up relay and the electromagnetic power relay are energized, each set of normally open contacts of the charging wake-up relay and the electromagnetic power relay is closed, which can achieve the effect of closing the main power switch. Finally, the battery of the electric vehicle can be normally charged according to the charging strategy. In addition, when the battery of the electric vehicle is fully charged and the BMS detects that the vehicle battery is fully charged, the positive voltage at the charging wake-up port and the delayed power-off port of the VCU can be stopped from being output, thereby enabling the coils of the charging wake-up relay and the electromagnetic power relay to lose power. Finally, except for the devices in the constant power control mode, other electrical devices of the electric vehicle are powered off, and the charging of the electric vehicle ends.

[0063] Therefore, for the power supply circuit provided by the present invention, by detecting the start and end of charging of the electric vehicle, the energization and power-off of the coils of the charging wake-up relay and the electromagnetic power relay are controlled to complete the start and end of charging of the electric vehicle. From the start to the end of charging of the electric vehicle, the staff is not required to operate the main power switch of the power supply circuit throughout the process. At the same time, when the electric vehicle is parked for a long time after being fully charged, the situation of power loss in each module caused by not closing the main power switch of the power supply circuit will not occur, thereby affecting the service life of each module of the electric vehicle.

[0064] As an alternative embodiment, the delay power-off port of the VCU is connected to the positive electrode of the seventh diode D7, and the negative electrode of the seventh diode D7 is connected to the positive electrode of the coil of the electromagnetic power relay.

[0065] Specifically, the VCU can determine whether the electric vehicle is in a working state by obtaining the operating parameters of the whole vehicle. Among them, the operating parameters of the whole vehicle can be parameter information such as vehicle speed, motor speed, and torque.

[0066] It should be noted that when the electric vehicle is in a normal driving working state, the operating parameters of the whole vehicle will be higher than a certain threshold. For example, the vehicle speed will be higher than 5 km / h; while when the electric vehicle is in a standby state of stopped driving, the operating parameters of the whole vehicle will be lower than a certain threshold. For example, the vehicle speed will be lower than 5 km / h.

[0067] Therefore, when the VCU determines that the electric vehicle is in a working state according to the operating parameters of the whole vehicle, the delay power-off port of the VCU outputs a positive voltage and is connected to the positive electrode of the coil of the electromagnetic power relay through the seventh diode D7. Among them, the seventh diode D7 can ensure that the current in the charging wake-up line will not be reversely input to the VCU, resulting in damage to the VCU, and improving the safety of the VCU.

[0068] Optionally, Figure 4 is a schematic diagram of the control process of the power supply circuit provided by the present invention under abnormal power-off of the working machine, as Figure 4 shown, including but not limited to the following steps:

[0069] When the VCU determines that the electric vehicle is in a working state according to the operating parameters of the whole vehicle, the delay power-off port of the VCU starts to output a positive voltage.

[0070] When the electric vehicle is in a working state, if the driver on the electric vehicle accidentally touches the main power switch of the power supply circuit, resulting in the main power switch of the power supply circuit being switched from closed to open state, there will be a situation where the electrical equipment of the whole vehicle is instantly powered off, affecting the normal driving of the electric vehicle, and thus easily causing safety accidents and endangering the personal safety of the driver.

[0071] The positive voltage output by the delay power-off port of the VCU can keep the coil of the electromagnetic power relay energized, so that each set of normally open contacts of the electromagnetic power relay remains closed.

[0072] Since each set of normally open contacts of the electromagnetic power relay remains closed, the battery will supply power to the power input bus of the chassis power distribution box, thereby ensuring that the electric vehicle remains powered and preventing the situation where the electrical equipment of the whole vehicle of the electric vehicle is instantly powered off.

[0073] It should be noted that when the electric vehicle stops running normally, due to the change of the vehicle's operating parameters, when the VCU determines that the vehicle is no longer in the working state according to the vehicle's operating parameters, the positive voltage output at the delayed power-off port of the VCU will stop, so as to ensure that when the vehicle has stopped running and entered the standby state, the electrical equipment of the electric vehicle can also stop working normally.

[0074] Therefore, the VCU is set to output a positive voltage at the delayed power-off port when determining that the electric vehicle is in the working state according to the vehicle's operating parameters, ensuring that during the normal driving of the electric vehicle, the situation of instantaneous power-off of the vehicle's electrical equipment due to accidental touch of the main power switch will not occur, improving the driving safety of the electric vehicle and protecting the personal safety of the driver.

[0075] The power supply circuit provided by the present invention realizes charging the vehicle even after disconnecting the main power switch by setting a charging wake-up relay and an electromagnetic power relay, and can automatically disconnect the main power supply after the vehicle charging is completed, avoiding the situation of power loss of each module when the vehicle is parked for a long time after charging, and the staff does not need to monitor the entire charging process, saving manpower.

[0076] Based on the content of the above embodiments, as an alternative embodiment, it further includes an ignition lock, an ACC power relay, an IG1 power relay, and an IG2 power relay.

[0077] The positive pole of the storage battery is connected to the constant power output bus of the power supply circuit through the first thermal circuit breaker F1, and the first common terminal B1 and the second common terminal B2 of the ignition lock are connected to the constant power output bus through the second thermal circuit breaker F2.

[0078] The ACC power output port of the ignition lock is connected to the positive pole of the coil of the ACC power relay, and a set of normally open contacts of the ACC power relay are respectively connected to the constant power output bus and the ACC power output bus of the power supply circuit.

[0079] Optionally, a normally open contact of the ACC power relay can be connected to the constant power output bus through the sixteenth thermal circuit breaker F16 to ensure the safe operation of the circuit connecting the ACC power relay and the constant power output bus.

[0080] The IG1 power output port of the ignition lock is connected to the positive pole of the coil of the IG1 power relay, and a set of normally open contacts of the IG1 power relay are respectively connected to the constant power output bus and the IG1 power output bus of the power supply circuit.

[0081] Optionally, a normally open contact of the IG1 power relay can be connected to the constant power output bus through the seventeenth thermal circuit breaker F17 to ensure the safe operation of the circuit connecting the IG1 power relay and the constant power output bus.

[0082] The IG2 power output port of the ignition lock is connected to the positive pole of the coil of the IG2 power relay, and a set of normally open contacts of the IG2 power relay are respectively connected to the constant power output bus and the IG2 power output bus of the power circuit.

[0083] Optionally, a normally open contact of the IG2 power relay can be connected to the constant power output bus through the eighteenth thermal circuit breaker F18 to ensure the safe operation of the circuit where the IG1 power relay is connected to the constant power output bus.

[0084] When the change-over switch of the ignition lock is switched to the LOCK position, the first common terminal B1 and the second common terminal B2 are both in an open state with the ACC power output port, the IG1 power output port, and the IG2 power output port.

[0085] When the change-over switch of the ignition lock is switched to the ACC position, the first common terminal B1 is electrically connected to the ACC power output port.

[0086] When the change-over switch of the ignition lock is switched to the ON position, the first common terminal B1 is electrically connected to both the ACC power output port and the IG1 power output port, and the second common terminal B2 is electrically connected to the IG2 power output port; the IG1 power output port is connected to the low-voltage electrical port of the VCU. Among them, the low-voltage electrical port of the VCU can be the ON gear detection port of the VCU.

[0087] When the change-over switch of the ignition lock is switched to the ST position, the first common terminal B1 is electrically connected to the IG1 power output port, and the second common terminal B2 is electrically connected to the ST power output port of the ignition lock; the ST power output port is connected to the low-voltage electrical port of the VCU. Among them, the low-voltage electrical port of the VCU can be the start gear detection port of the VCU.

[0088] Specifically, the positive pole of the storage battery is connected to the constant power output bus of the power circuit through the first thermal circuit breaker F1, and the first common terminal B1 and the second common terminal B2 of the ignition lock are connected to the constant power output bus through the second thermal circuit breaker F2. Among them, the first thermal circuit breaker F1 can effectively protect the safe operation of the circuit where the storage battery is connected to the constant power output bus, and the second thermal circuit breaker F2 can effectively protect the safe operation of the circuit where the ignition lock is connected to the constant power output bus.

[0089] Optionally, Figure 5 is a schematic diagram of the control process for controlling a work machine to be powered on using the power circuit provided by the present invention, as Figure 5 shown, including but not limited to the following steps:

[0090] When starting to power on the electric vehicle, turn on the ignition lock switch of the electric vehicle, the electromagnetic power relay coil is energized, and when the coil of the electromagnetic power relay is energized, each set of normally open contacts of the electromagnetic power relay coil closes.

[0091] Since one set of normally open contacts of the electromagnetic power relay are respectively connected to the positive pole of the battery and the power input bus of the chassis power distribution box, when this set of normally open contacts of the electromagnetic power relay closes, the battery starts to supply power to the power input bus of the chassis power distribution box.

[0092] After the power input bus of the chassis power distribution box is connected to the battery, the chassis power distribution box starts to distribute power to the electric vehicle.

[0093] When the change-over switch of the ignition lock is switched to the ACC gear, the first common terminal B1 is conducted with the ACC power output port, and the battery will make the ACC power output port start to output positive voltage through the constant power output bus.

[0094] After the ACC power output port starts to output positive voltage, the coil of the ACC power relay is energized, causing each set of normally open contacts of the ACC power relay to close.

[0095] After each set of normally open contacts of the ACC power relay closes, the battery starts to supply power to the ACC power output bus.

[0096] Furthermore, the electric vehicle can be supplied with ACC power through the ACC power output bus of the power circuit, such as supplying power to in-vehicle accessory devices such as the vehicle's audio-visual system and instrument lights.

[0097] When the change-over switch of the ignition lock is switched to the ON gear, the first common terminal B1 is conducted with both the ACC power output port and the IG1 power output port, and the second common terminal B2 is conducted with the IG2 power output port. The battery will make the IG1 power output port and the IG2 power output port start to output positive voltage through the constant power output bus.

[0098] After the IG1 power output port starts to output positive voltage, the coil of the IG1 power relay is energized, causing each set of normally open contacts of the IG1 power relay to close.

[0099] After each set of normally open contacts of the IG1 power relay closes, the battery starts to supply power to the IG1 power output bus.

[0100] Furthermore, the electric vehicle can be supplied with IG1 power through the IG1 power output bus of the power circuit, such as supplying power to devices related to driving safety.

[0101] After the IG2 power output port starts to output positive voltage, the coil of the IG2 power relay is energized, causing each set of normally open contacts of the IG2 power relay to close.

[0102] After each set of normally open contacts of the IG2 power relay closes, the battery starts to supply power to the IG2 power output bus.

[0103] Furthermore, power can be supplied to the electric vehicle through the IG2 power output bus of the power supply circuit, for example, to other devices of the electric vehicle.

[0104] When the vehicle is powered on and the low-voltage electrical port of the VCU (such as the ON gear detection port) detects the positive voltage output from the IG1 power output port, each control unit of the electric vehicle performs a self-check. If there is an abnormality, it reports the abnormality. If there is no abnormality, it can wait to apply high voltage when the electric vehicle starts.

[0105] When the changeover switch of the ignition lock is switched to the ST gear, the first common terminal B1 is conducted with the IG1 power output port, and the second common terminal B2 is conducted with the ST power output port of the ignition lock. The battery will cause the IG1 power output port and the ST power output port to start outputting positive voltage through the constant power output bus. Among them, the ST power output port of the ignition lock is connected to the start gear detection port of the VCU.

[0106] When the start gear detection port of the VCU detects the positive voltage output from the ST power output port of the ignition lock, the VCU will perform a high-voltage operation on the electric vehicle, and the electric vehicle starts.

[0107] Furthermore, Figure 6 is a schematic diagram of the control process for controlling the power-down of a work machine using the power supply circuit provided by the present invention, as Figure 6 shown, including but not limited to the following steps:

[0108] When the electric vehicle is normally powered down, the ignition lock switch is turned off, that is, the changeover switch of the ignition lock is switched to the LOCK gear. The first common terminal B1 and the second common terminal B2 are both in a disconnected state from the ACC power output port, the IG1 power output port, and the IG2 power output port. The battery will no longer cause the ACC power output port, the IG1 power output port, and the IG2 power output port to output positive voltage through the constant power output bus.

[0109] Then the coils of the ACC power relay, the IG1 power relay, and the IG2 power relay are all de-energized, causing each set of normally open contacts of the ACC power relay, each set of normally open contacts of the IG1 power relay, and each set of normally open contacts of the IG2 power relay to return to the open state.

[0110] Then the battery stops supplying power to the ACC power output bus, the IG1 power output bus, and the IG2 power output bus of the power supply circuit. The ACC power output bus, the IG1 power output bus, and the IG2 power output bus of the power supply circuit are all disconnected. The electric vehicle will be powered off, the constant power control mode device will enter the sleep mode, and other electrical devices will stop working and turn off.

[0111] When the ignition lock switch is turned off, the electromagnetic power relay coil will lose power, and each set of normally open contacts of the electromagnetic power relay will return to the disconnected state.

[0112] At this point, the electric vehicle is powered off normally.

[0113] The power supply circuit provided by the present invention can effectively complete the normal power-on and power-off of the vehicle by switching the ignition lock gear and determining the power-on, power-off and start-up of the electric vehicle through various detection ports of the VCU.

[0114] Based on the above embodiments, as an optional embodiment, the charging wake-up port of the battery management system BMS, the charging wake-up port of the telematics control unit (TCU), the charging wake-up port of the all-in-one controller and the charging wake-up port of the instrument controller are respectively connected to the charging wake-up bus.

[0115] Specifically, when the coil of the charging wake-up relay is energized and each set of normally open contacts of the charging wake-up relay is closed, the normally-powered output bus and the charging wake-up bus will be connected through one set of normally open contacts of the charging wake-up relay after closing, so that the charging wake-up bus is energized. Therefore, since the charging wake-up port of the BMS, the charging wake-up port of the TCU, the charging wake-up port of the all-in-one controller, and the charging wake-up port of the instrument controller are respectively connected to the charging wake-up bus, the charging wake-up port of the BMS, the charging wake-up port of the TCU, the charging wake-up port of the all-in-one controller, and the charging wake-up port of the instrument controller will be energized and activated, and wake up the BMS, TCU, the all-in-one controller, and the instrument controller.

[0116] The power supply circuit provided by the present invention is connected to the charging wake-up bus respectively by setting the charging wake-up port of the BMS, the charging wake-up port of the TCU, the charging wake-up port of the all-in-one controller and the charging wake-up port of the instrument controller, so that when the electric vehicle starts charging, it is ensured that each electrical device can be normally awakened for charging.

[0117] Based on the above embodiment, as an optional embodiment, the low-voltage electrical port of the all-in-one controller is connected to the cathode of the first diode D1 and the cathode of the second diode D2, the anode of the first diode D1 is connected to the charging wake-up bus, and the anode of the second diode D2 is connected to the IG1 power output bus. The low-voltage electrical port of the all-in-one controller can be a charging wake-up port of the all-in-one controller.

[0118] The low-voltage electrical port of the battery management system BMS is connected to the cathode of the third diode D3 and the cathode of the fourth diode D4, the anode of the third diode D3 is connected to the charging wake-up bus, and the anode of the fourth diode D4 is connected to the IG1 power output bus. The low-voltage electrical port of the BMS can be a charging wake-up port of the BMS.

[0119] The low-voltage electrical port of the instrument controller is connected to the cathode of the fifth diode D5 and the cathode of the sixth diode D6, the anode of the fifth diode D5 is connected to the charging wake-up bus, and the anode of the sixth diode D6 is connected to the IG1 power output bus. The low-voltage electrical port of the instrument controller can be a charging wake-up port of the instrument controller.

[0120] Specifically, by setting the first diode D1 and the second diode D2, it can be effectively ensured that the current can only be conducted unidirectionally to the low-voltage electrical port of the all-in-one controller, thereby preventing the current in the circuit from flowing to other accessories through the charging wake-up bus or the IG1 power output bus, thereby avoiding safety accidents.

[0121] Furthermore, by providing the third diode D3 and the fourth diode D4, it can be effectively ensured that the current can only be conducted unidirectionally to the low-voltage electrical port of the BMS, thereby preventing the current in the circuit from flowing to other accessories through the charging wake-up bus or the IG1 power output bus, thereby avoiding safety accidents.

[0122] In addition, by setting the fifth diode D5 and the sixth diode D6, it can be effectively ensured that the current can only be conducted unidirectionally to the low-voltage electrical port of the instrument controller, thereby preventing the current in the circuit from flowing to other accessories through the charging wake-up bus or the IG1 power output bus, thereby avoiding safety accidents.

[0123] The power supply circuit provided by the present invention can effectively improve the safety of the power supply circuit by providing a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5 and a sixth diode D6, and avoid the circuit in the power supply circuit from being erroneously conducted to other unnecessary devices, thereby reducing the possibility of safety accidents.

[0124] Based on the above embodiment, as an optional embodiment, an eighth diode D8 is further included; the anode of the eighth diode D8 is connected to the IG1 power output port of the ignition lock, and the cathode of the eighth diode D8 is connected to the anode of the coil of the electromagnetic power relay.

[0125] Specifically, the eighth diode D8 can ensure that the current in the circuit can only be conducted unidirectionally to the electromagnetic power relay, thereby preventing the reverse input of current from other circuits from causing the IG1 power relay and the like to be erroneously energized.

[0126] The power supply circuit provided by the present invention can effectively improve the safety of the power supply circuit by providing the eighth diode D8, and avoid the circuit in the power supply circuit from being erroneously conducted to other unnecessary devices, thereby reducing the possibility of safety accidents.

[0127] Based on the above embodiment, as an optional embodiment, the normal power input port of the vehicle networking control unit TCU is connected to the normal power output bus through the third thermal circuit breaker F3.

[0128] The normal power input port of the VCU is connected to the normal power output bus through the fourth thermal circuit breaker F4.

[0129] The normal power input port of the BMS is connected to the normal power output bus through the fifth thermal circuit breaker F5.

[0130] The normal power input port of the all-in-one controller is connected to the normal power output bus through the sixth thermal circuit breaker F6.

[0131] The normal power input port of the instrument controller is connected to the normal power output bus through the seventh thermal circuit breaker F7.

[0132] Specifically, a thermal circuit breaker is a device that disconnects a circuit when the circuit is overloaded for a long time or short-circuited, thereby protecting the circuit from running safely.

[0133] Therefore, the third thermal circuit breaker F3, the fourth thermal circuit breaker F4, the fifth thermal circuit breaker F5, the sixth thermal circuit breaker F6 and the seventh thermal circuit breaker F7 can protect the safe operation of the circuits connected to the TCU, VCU, BMS, all-in-one controller and instrument controller and the normal power output bus, avoid damage to the above-mentioned electrical equipment due to long-term circuit overload, etc., and improve the service life of the above-mentioned electrical equipment.

[0134] Optionally, the TCU, VCU, BMS, all-in-one controller and instrument controller can also be remotely connected and interactively connected via the CANH and CANL ports to exchange information.

[0135] The power supply circuit provided by the present invention protects the safe operation of the circuit of each electrical device in the normal power control mode by arranging a thermal circuit breaker, thereby preventing the electrical devices from being damaged due to long-term circuit overload and the like, and improving the working life of each electrical device.

[0136] Based on the above embodiments, as an optional embodiment, the power input bus of the chassis power distribution box is connected to the first switch electrical output bus of the power circuit through the eighth thermal circuit breaker F8, and is connected to the second switch electrical output bus of the power circuit through the ninth thermal circuit breaker F9.

[0137] Specifically, when the electric energy in the storage battery is transmitted to the chassis power distribution box through the normally open contact after the electromagnetic power relay is closed, the current in the power input bus of the chassis power distribution box will be connected to the first switched power output bus of the power circuit through the eighth thermal circuit breaker F8 and to the second switched power output bus of the power circuit through the ninth thermal circuit breaker F9.

[0138] Among them, the first switched power output bus and the second switched power output bus are mainly used for vehicle-wide power distribution, such as power distribution for safe driving and lighting-related equipment. The eighth thermal circuit breaker F8 and the ninth thermal circuit breaker F9 are used to protect the safe operation of the circuit.

[0139] Optionally, the switched power detection port of the VCU can be connected to the first switched power bus through the thirteenth thermal circuit breaker F13 and the fourteenth thermal circuit breaker F14, thereby ensuring the safe operation of the circuit for the VCU to detect whether the first switched power bus is powered.

[0140] Optionally, the instrument controller can be connected to the first switched power bus through the nineteenth thermal circuit breaker F19, thereby protecting the safe operation of the circuit.

[0141] The power circuit provided by the present invention protects the safe operation of the circuits of the first switched power output bus and the second switched power output bus by setting the eighth thermal circuit breaker F8 and the ninth thermal circuit breaker F9, ensuring that the chassis power distribution box can perform normal vehicle-wide power distribution for the electric vehicle.

[0142] Based on the content of the above embodiments, as an optional embodiment, the intelligent charging detection port of the VCU is connected to the positive pole of the ninth diode D9, and the negative pole of the ninth diode D9 is connected to the positive pole of the coil of the charging wake-up relay.

[0143] When the VCU determines that there is a vehicle in the intelligent charging state, it outputs a positive voltage at the intelligent charging detection port.

[0144] Specifically, when the VCU detects that the vehicle is in the intelligent charging state, the intelligent charging detection port of the VCU starts to output a positive voltage, which is output to the charging wake-up relay through the one-way conduction of the ninth diode D9, so that the coil of the charging wake-up relay is energized, and then each set of normally closed contacts of the charging wake-up relay is closed, which will connect the constant power output bus and the charging wake-up bus, and make the charging wake-up bus energized, and then start intelligent charging of the electric vehicle.

[0145] Among them, intelligent charging can be through charging by a solar panel or through mutual charging between vehicles.

[0146] It should be noted that the ninth diode D9 can also ensure that the current will not be reversely input to the intelligent charging detection port of the VCU, thereby ensuring the safety of the VCU and increasing the service life of the VCU.

[0147] The power supply circuit provided by the present invention enables the power supply circuit to meet the requirements of intelligent power replenishment by setting an intelligent power replenishment port, thereby improving the diversity of options for charging the battery of an electric vehicle.

[0148] Based on the above embodiments, as an alternative embodiment, the present invention further provides a work machine including any one of the above power supply circuits.

[0149] Specifically, the work machine may be an electric engineering vehicle, such as an electric sanitation vehicle or an electric mixer truck, and this embodiment does not make specific limitations thereto.

[0150] The work machine provided by the present invention can still charge the vehicle after disconnecting the main power switch and automatically disconnect the main power after the vehicle is fully charged by setting a charging wake-up relay and an electromagnetic power relay, avoiding the occurrence of power shortage in each module when the vehicle is parked for a long time after being fully charged, and the staff does not need to monitor the entire charging process, saving manpower.

[0151] The embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative work.

[0152] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0153] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power supply circuit, characterized in that, It includes a charging wake-up relay and an electromagnetic power relay; The positive pole of the coil of the charging wake-up relay is connected to the charging wake-up port of the vehicle control unit VCU; The charging detection port of the VCU is communicatively connected to the charger, and the delayed power-off port of the VCU is connected to the positive pole of the coil of the electromagnetic power relay; A set of normally open contacts of the electromagnetic power relay are connected to the positive pole of the battery and the power input bus of the chassis power distribution box; A set of normally open contacts of the charging wake-up relay are connected to the constant power output bus and the charging wake-up bus; The negative pole of the coil of the charging wake-up relay, the negative pole of the coil of the electromagnetic power relay, and the negative pole of the battery are connected; when the VCU determines that there is an input signal at the charging detection port, it synchronously outputs a positive voltage at the charging wake-up port and the delayed power-off port, and the input signal is generated when the charging current of the current charging port of the charger is greater than the preset current.

2. The power supply circuit according to claim 1, wherein It further includes an ignition lock, an ACC power relay, an IG1 power relay, and an IG2 power relay; The positive pole of the battery is connected to the constant power output bus of the power circuit through a first thermal circuit breaker, and the first common terminal and the second common terminal of the ignition lock are connected to the constant power output bus through a second thermal circuit breaker; The ACC power output port of the ignition lock is connected to the positive pole of the coil of the ACC power relay, and a set of normally open contacts of the ACC power relay are respectively connected to the constant power output bus and the ACC power output bus of the power circuit; The IG1 power output port of the ignition lock is connected to the positive pole of the coil of the IG1 power relay, and a set of normally open contacts of the IG1 power relay are respectively connected to the constant power output bus and the IG1 power output bus of the power circuit; The IG2 power output port of the ignition lock is connected to the positive pole of the coil of the IG2 power relay, and a set of normally open contacts of the IG2 power relay are respectively connected to the constant power output bus and the IG2 power output bus of the power circuit; When the change-over switch of the ignition lock is switched to the LOCK position, the first common terminal and the second common terminal are both in an open state with the ACC power output port, the IG1 power output port, and the IG2 power output port; When the change-over switch of the ignition lock is switched to the ACC position, the first common terminal is conducted with the ACC power output port; When the change-over switch of the ignition lock is switched to the ON position, the first common terminal is conducted with the ACC power output port and the IG1 power output port, and the second common terminal is conducted with the IG2 power output port; the IG1 power output port is connected to the low-voltage electrical port of the VCU; When the change-over switch of the ignition lock is switched to the ST position, the first common terminal is conducted with the IG1 power output port, and the second common terminal is conducted with the ST power output port of the ignition lock; the ST power output port is connected to the low-voltage electrical port of the VCU.

3. The power supply circuit according to claim 1, wherein The charging wake-up port of the battery management system BMS, the charging wake-up port of the vehicle networking control unit TCU, the charging wake-up port of the all-in-one controller and the charging wake-up port of the instrument controller are respectively connected to the charging wake-up bus.

4. The power supply circuit according to claim 1, wherein The low-voltage electrical port of the all-in-one controller is connected to the cathode of the first diode and the cathode of the second diode, the anode of the first diode is connected to the charging wake-up bus, and the anode of the second diode is connected to the IG1 power output bus; The low-voltage electrical port of the battery management system BMS is connected to the cathode of the third diode and the cathode of the fourth diode, the anode of the third diode is connected to the charging wake-up bus, and the anode of the fourth diode is connected to the IG1 power output bus; The low-voltage electrical port of the instrument controller is connected to the cathode of the fifth diode and the cathode of the sixth diode, the anode of the fifth diode is connected to the charging wake-up bus, and the anode of the sixth diode is connected to the IG1 power output bus.

5. The power supply circuit according to any one of claims 3-4, characterized in that, The delayed power-off port of the VCU is connected to the anode of the seventh diode, and the cathode of the seventh diode is connected to the anode of the coil of the electromagnetic power relay.

6. The power supply circuit according to claim 5, characterized in that It also includes an eighth diode; the anode of the eighth diode is connected to the IG1 power output port of the ignition lock, and the cathode of the eighth diode is connected to the anode of the coil of the electromagnetic power relay.

7. The power supply circuit according to claim 5, characterized in that: The normal power input port of the vehicle networking control unit TCU is connected to the normal power output bus through a third thermal circuit breaker; The normal power input port of the VCU is connected to the normal power output bus via a fourth thermal circuit breaker; The normal power input port of the BMS is connected to the normal power output bus via a fifth thermal circuit breaker; The normal power input port of the all-in-one controller is connected to the normal power output bus via a sixth thermal circuit breaker; The normal power input port of the instrument controller is connected to the normal power output bus through a seventh thermal circuit breaker.

8. The power supply circuit according to claim 1, wherein, The power input bus of the chassis power distribution box is connected to the first switch electrical output bus of the power circuit through the eighth thermal circuit breaker, and is connected to the second switch electrical output bus of the power circuit through the ninth thermal circuit breaker.

9. The power supply circuit according to claim 1, wherein The intelligent power replenishment detection port of the VCU is connected to the positive electrode of the ninth diode, and the negative electrode of the ninth diode is connected to the positive electrode of the coil of the charging wake-up relay; When the VCU determines that the vehicle is in the intelligent power replenishment state, it outputs a positive voltage at the intelligent power replenishment detection port.

10. An earthmoving machine, characterized in that, The method comprises a power supply circuit as claimed in any one of claims 1 to 9.

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