Power supply circuit and vehicle

Abstract

The utility model provides a power supply circuit and a vehicle, and relates to the technical field of power supply circuits. The switching circuit is electrically connected between the output end of the DCDC circuit and the input end of the switching power supply module, and is also electrically connected between the low-voltage power supply interface and the input end of the switching power supply module. When the DCDC circuit needs to respond to a DCDC enable signal to work, the switching circuit controls the DC power supply access to be connected and further controls the battery power supply access to be disconnected, so that the output wiring harness of the DCDC circuit is connected with the input wiring harness of the switching power supply module, and the switching power supply module is directly powered by direct current output by the DCDC circuit. The length of a transmission wire harness for supplying power to the switching power supply module is shortened, the service time of a low-voltage battery is shortened, the service life of the low-voltage battery is prolonged, the coupling condition between the output wire harness of the DCDC circuit and the input wire harness of the switching power supply module is improved, and the EMI problem of the power supply circuit is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply circuits, and more specifically, to a power supply circuit and a vehicle. Background Art

[0002] With the development of science and technology, cars are no longer limited to fuel cars. Many new energy vehicles have emerged, such as electric cars currently on the market. Among them, electric cars have many advantages in environmental protection and energy saving. Electric cars refer to vehicles that use on-board power as power and use motors to drive wheels. It can be seen that the on-board power supply is important in the components of electric cars. Existing on-board power supplies have the advantages of high integration and small size, which leads to EMI (Electromagnetic Interference) problems caused by severe coupling between noise sources. Utility Model Content

[0003] In view of this, the utility model provides a power supply circuit and a vehicle, which effectively solve the technical problems existing in the prior art, improve the EMI problem of the power supply circuit, and improve the reliability of the power supply circuit.

[0004] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0005] A power supply circuit comprises: a switch circuit, a processing circuit, a signal detection module and a switch power supply module;

[0006] The detection end of the processing circuit is electrically connected to the signal detection module, and the signal detection module is used to access the detection signal. The output end of the processing circuit is electrically connected to the control end of the switch circuit and outputs a switch signal. The switch circuit is electrically connected between the output end of the DCDC circuit (direct current to direct current circuit) and the input end of the switch power module, and the switch circuit is also electrically connected between the low-voltage power supply interface and the input end of the switch power module. The switch signal is a signal for controlling the switch circuit to connect the DC power supply path between the output end of the DCDC circuit and the input end of the switch power module, and controlling the switch circuit to disconnect the battery power supply path between the low-voltage power supply interface and the input end of the switch power module.

[0007] Optionally, the switch circuit includes a first switch, a second switch, a third switch and a fourth switch;

[0008] The first end of the first switch and the first end of the third switch are both electrically connected to the positive input terminal of the switching power module, and the first end of the second switch and the second end of the fourth switch are both electrically connected to the negative input terminal of the switching power module;

[0009] The second end of the first switch is electrically connected to the positive pole of the low-voltage power supply interface, the second end of the second switch is electrically connected to the negative pole of the low-voltage power supply interface, the second end of the third switch is electrically connected to the positive pole of the output end of the DCDC circuit, and the second end of the fourth switch is electrically connected to the negative pole of the output end of the DCDC circuit.

[0010] Optional,

[0011] The switch circuit also includes a first anti-reverse device, a second anti-reverse device, a third anti-reverse device and a fourth anti-reverse device;

[0012] The first anti-reverse device and the first switch are connected in series between the positive electrode of the low-voltage power supply interface and the positive electrode of the input end of the switching power supply module, and the second anti-reverse device and the second switch are connected in series between the negative electrode of the low-voltage power supply interface and the negative electrode of the input end of the switching power supply module;

[0013] The third anti-reverse device and the third switch are connected in series between the positive pole of the output end of the DCDC circuit and the positive pole of the input end of the switching power module, and the fourth anti-reverse device and the fourth switch are connected in series between the negative pole of the output end of the DCDC circuit and the negative pole of the input end of the switching power module.

[0014] Optionally, the power supply circuit further includes: a fifth anti-reverse device and a sixth anti-reverse device;

[0015] The fifth anti-reverse device is connected in series between the positive pole of the output end of the DCDC circuit and the positive pole of the low-voltage output interface, and the sixth anti-reverse device is connected in series between the negative pole of the output end of the DCDC circuit and the negative pole of the low-voltage output interface.

[0016] Optionally, any anti-reverse device includes an anti-reverse diode.

[0017] Optionally, the power supply circuit further includes: a power supply interface and an OBC (on board charge) circuit;

[0018] The power supply interface is used to access a charging power supply, the input end of the OBC circuit is electrically connected to the power supply interface, and the output end of the OBC circuit is electrically connected to a high-voltage transmission interface.

[0019] Optionally, the power supply circuit further includes: a power supply filter circuit, wherein the power supply filter circuit is electrically connected between the power supply interface and the input end of the OBC circuit;

[0020] and / or, a low voltage output filter circuit, the low voltage output filter circuit being electrically connected between the low voltage output interface and an output end of the DCDC circuit;

[0021] and / or, a low-voltage power supply filter circuit, wherein the low-voltage power supply filter circuit is electrically connected between the low-voltage power supply interface and an input end of the switching power supply module;

[0022] and / or, a high-voltage filter circuit, the high-voltage filter circuit being electrically connected between the high-voltage transmission interface and the input end of the DCDC circuit and the output end of the OBC circuit;

[0023] And / or, a signal detection filter circuit, wherein the signal detection filter circuit is electrically connected between the signal detection module and a control end of the processing circuit.

[0024] Optionally, the power supply circuit further includes a low-voltage LISN circuit, and the low-voltage LISN circuit is electrically connected between the switching power supply module and the low-voltage battery.

[0025] Optionally, the switch signal is a signal that controls the switch circuit to connect to the battery power supply path and then to connect to the DC power supply path, and controls the switch circuit to disconnect the battery power supply path after connecting to the DC power supply path for a set period of time.

[0026] Based on the same inventive concept, the utility model also provides a vehicle, which includes the above-mentioned power supply circuit.

[0027] Optionally, the transportation vehicle includes an electric car.

[0028] Compared with the prior art, the technical solution provided by the utility model has at least the following advantages:

[0029] The utility model provides a power supply circuit and a vehicle, wherein the power supply circuit includes a switch circuit, a processing circuit, a signal detection module and a switch power supply module, wherein the switch circuit is connected to a switch signal, and the switch circuit is electrically connected between the output end of the DCDC circuit and the input end of the switch power supply module, and the switch circuit is also electrically connected between the low-voltage power supply interface and the input end of the switch power supply module. The switch signal is a signal for controlling the switch circuit to connect the DC power supply path between the output end of the DCDC circuit and the input end of the switch power supply module, and for controlling the switch circuit to disconnect the battery power supply path between the low-voltage power supply interface and the input end of the switch power supply module.

[0030] It can be seen from the above content that the technical solution provided by the utility model is to design a switch circuit to be electrically connected between the output end of the DCDC circuit and the input end of the switching power module, and at the same time to be electrically connected between the low-voltage power supply interface and the input end of the switching power module. When the DCDC circuit needs to respond to the DCDC enable signal to work, the switch circuit controls the DC power supply path to be connected, and the switch circuit also controls the battery power supply path to be disconnected, so that the output wiring harness of the DCDC circuit is connected to the input wiring harness of the switching power module, and the switching power module is directly powered by the direct current output by the DCDC circuit, which improves the coupling between the output wiring harness of the DCDC circuit and the input wiring harness of the switching power module, improves the EMI problem of the power circuit, and improves the reliability of the power circuit.

[0031] Furthermore, the switching power supply module is directly powered by the DC power output by the DCDC circuit, which reduces the use time of the low-voltage battery and increases its service life. Compared with the circuit that transmits the DC power to the low-voltage battery and then uses the low-voltage battery to power the switching power supply module, the length of the transmission harness that powers the switching power supply module is shortened, which can not only reduce the power loss on the transmission harness and improve the efficiency of the power supply circuit, but also suppress the strong transmission and radiation emission problems generated by the transmission harness, reducing the noise of the power supply circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0033] Figure 1 A circuit diagram of a power supply circuit provided in an embodiment of the utility model;

[0034] Figure 2 A circuit diagram of another power supply circuit provided by an embodiment of the utility model;

[0035] Figure 3 A circuit diagram of another power supply circuit provided in an embodiment of the utility model;

[0036] Figure 4 A circuit diagram of another power supply circuit provided in an embodiment of the utility model;

[0037] Figure 5 A circuit diagram of another power supply circuit provided in an embodiment of the utility model;

[0038] Figure 6A circuit diagram of another power supply circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] As described in the background technology, an electric vehicle refers to a vehicle that uses an on-board power supply as a power source and uses a motor to drive the wheels. It can be seen that the on-board power supply is important in the components of electric vehicles. The existing on-board power supply has the advantages of high integration and small size, which leads to EMI problems caused by severe coupling between noise sources. That is, due to the high integration and small size of the on-board power supply, the spacing between the noise sources inside it is small, resulting in very serious coupling. Even if a customized shielding cover is used to improve the coupling between noise sources, only partial shielding can be achieved. Some areas cannot be shielded due to line restrictions and other factors, such as the output wiring harness of the DCDC circuit in the on-board power supply and the input wiring harness of the switching power module. The output wiring harness of the DCDC circuit is very easy to produce serious coupling with the input wiring harness of the switching power module, and the output noise of the DCDC circuit is very high, which ultimately leads to EMI problems and high noise problems in the on-board power supply.

[0041] Based on this, the embodiment of the utility model provides a power supply circuit and a vehicle, which effectively solves the technical problems existing in the prior art, improves the EMI problem of the power supply circuit, and improves the reliability of the power supply circuit. To achieve the above purpose, the technical solution provided by the embodiment of the utility model is as follows, and the specific reference is Figures 1 to 6 The technical solution provided by the embodiment of the utility model is described in detail.

[0042] refer to Figure 1 , which is a circuit diagram of a power supply circuit provided by an embodiment of the utility model, wherein the power supply circuit includes: a switch circuit 200 , a processing circuit 300 , a signal detection module SN and a switch power supply module 400 .

[0043] The detection end of the processing circuit 300 is electrically connected to the signal detection module SN, and the signal detection module SN is used to access the detection signal. The output end of the processing circuit 300 is electrically connected to the control end of the switch circuit 200 and outputs a switch signal. The switch circuit 200 is electrically connected between the output end of the DCDC circuit 100 and the input end of the switch power module 400, and the switch circuit 200 is also electrically connected between the low-voltage power supply interface LVDC and the input end of the switch power module 400. When the detection signal includes a DCDC enable signal, the switch signal is a signal for controlling the switch circuit to connect the DC power supply path between the output end of the DCDC circuit 100 and the input end of the switch power module 400, and controlling the switch circuit 200 to disconnect the battery power supply path between the low-voltage power supply interface KL and the input end of the switch power module 400.

[0044] In addition, the power supply circuit provided in the embodiment of the utility model may include the DCDC circuit, and may also be electrically connected to the DCDC circuit independently. The input end of the DCDC circuit 100 provided in the embodiment of the utility model is electrically connected to the high-voltage transmission interface HV, the high-voltage transmission interface HV is electrically connected to the high-voltage battery 500, the output end of the DCDC circuit 100 is electrically connected to the low-voltage output interface LVDC, the low-voltage output interface LVDC is electrically connected to the input end of the low-voltage battery 600, and the output end of the low-voltage battery 600 is electrically connected to the low-voltage power supply interface KL, and the low-voltage power supply interface KL is electrically connected to the input end of the switching power supply module 400.

[0045] The high-voltage battery provided by the utility model can be a high-voltage power battery, and the low-voltage battery can be a low-voltage storage battery, and the switching power supply module can be a Flyback switching power supply module. The voltage range of the low-voltage storage battery can be 12V-48V, and the voltage range of the high-voltage power battery is 200V and above. The high-voltage battery provides power to the DCDC circuit through the high-voltage transmission interface, and the DCDC circuit converts the power into a set direct current and transmits it to the low-voltage battery through the low-voltage output interface to charge the low-voltage battery.

[0046] In addition, the high voltage and low voltage described in the present invention are comparative descriptions, and the voltage range of the high voltage related circuit described is greater than the voltage range of the low voltage related circuit described, such as the voltage transmitted by the high voltage transmission interface is greater than the voltage of the low voltage output interface and the low voltage power supply interface. When the power supply circuit is applied to the vehicle power supply, the low voltage and high voltage related circuits are the same as the prior art, so the present invention does not make redundant descriptions.

[0047] It can be understood that the technical solution provided by the embodiment of the utility model is designed to electrically connect the switch circuit between the output end of the DCDC circuit and the input end of the switching power module, and at the same time electrically connect between the low-voltage power supply interface and the input end of the switching power module. When the DCDC circuit needs to respond to the DCDC enable signal to work, the switch circuit controls the DC power supply path to be connected, and the switch circuit also controls the battery power supply path to be disconnected, so that the output wiring harness of the DCDC circuit is connected to the input wiring harness of the switching power module, and the switching power module is directly powered by the direct current output by the DCDC circuit, which improves the coupling between the output wiring harness of the DCDC circuit and the input wiring harness of the switching power module, improves the EMI problem of the power supply circuit, and improves the reliability of the power supply circuit. It can also reduce the use of shielding covers, reducing the volume and cost of the power supply circuit.

[0048] Furthermore, the switching power supply module is directly powered by the DC power output by the DCDC circuit, which reduces the use time of the low-voltage battery and increases its service life. Compared with the circuit that transmits the DC power to the low-voltage battery and then uses the low-voltage battery to power the switching power supply module, the length of the transmission harness that powers the switching power supply module is shortened, which can not only reduce the power loss on the transmission harness and improve the efficiency of the power supply circuit, but also suppress the strong transmission and radiation emission problems generated by the transmission harness, reducing the noise of the power supply circuit.

[0049] refer to Figure 2 As shown, it is a circuit diagram of another power supply circuit provided by an embodiment of the utility model, wherein the power supply circuit provided by the embodiment of the utility model can be applied to a vehicle power supply, wherein the power supply circuit can also charge the high-voltage battery 500 through an external charging power supply 700, and the power supply circuit also includes: a power supply interface and an OBC circuit; the power supply interface LN is used to access the charging power supply 700, the input end of the OBC circuit 800 is electrically connected to the power supply interface 700, and the output end of the OBC circuit 800 is electrically connected to the high-voltage transmission interface HV. Among them, the charging power supply 700 is an AC charging power supply, and the OBC circuit 800 is used to convert the AC power output by the charging power supply 700 into high-voltage DC power, and transmit it to the high-voltage battery 500 through the high-voltage transmission interface HV for charging.

[0050] The OBC circuit output, DCDC circuit input and output, low voltage battery input and output, switching power module input, etc. provided in the embodiment of the utility model are all direct current types, so the high voltage transmission interface, low voltage output interface and low voltage power supply interface are all related interfaces including positive and negative electrodes. Figure 3As shown, it is a circuit diagram of another power supply circuit provided by an embodiment of the utility model, wherein the power interface LN, the high-voltage transmission interface HV, the low-voltage output interface LVDC and the low-voltage power supply interface KL can be understood as a transmission wiring harness, the high-voltage transmission interface includes a positive pole HV+ and a negative pole HV-, the low-voltage output interface includes a positive pole LVDC+ and a negative pole LVDC-, the low-voltage power supply interface includes a positive pole KL30 and a negative pole KL31, that is, the power interface LN includes a live wire interface, a neutral wire interface, etc., and the utility model does not make specific restrictions on this.

[0051] Continue as Figure 3 As shown, the switch circuit 200 provided in the embodiment of the utility model can realize the connection or disconnection control of the DC power supply path and the battery power supply path through multiple switches. The switch circuit 200 includes a first switch K1, a second switch K2, a third switch K3 and a fourth switch K4. The first end of the first switch K1 and the first end of the third switch K2 are both electrically connected to the positive pole of the input end of the switch power module 400, and the first end of the second switch K2 and the second end of the fourth switch K4 are both electrically connected to the negative pole of the input end of the switch power module 400. The second end of the first switch K1 is electrically connected to the positive pole KL30 of the low-voltage power supply interface, the second end of the second switch K2 is electrically connected to the negative pole KL31 of the low-voltage power supply interface, the second end of the third switch K3 is electrically connected to the positive pole of the output end of the DCDC circuit 100, and the second end of the fourth switch K4 is electrically connected to the negative pole of the output end of the DCDC circuit 100.

[0052] It can be understood that the first switch, the second switch, the third switch and the fourth switch provided in the embodiment of the utility model all respond to the control of the switch signal to perform the action of switching on or off. When the detection signal includes a DCDC enable signal (the DCDC enable signal indicates that the DCDC circuit is controlled to work, and the power supply circuit is in the working mode at this time), the first switch and the second switch are both disconnected in response to the switch signal to disconnect the battery power supply path; at the same time, the third switch and the fourth switch are both turned on in response to the switch signal to connect the DC power supply path, thereby enabling the switching power supply module to be directly powered by the direct current output by the DCDC circuit, improving the coupling between the output wiring harness of the DCDC circuit and the input wiring harness of the switching power supply module, improving the EMI problem of the power supply circuit, and improving the reliability of the power supply circuit.

[0053] Optionally, the detection signal not only includes a DCDC enable signal, but also includes a low-voltage power-on enable signal, a low-voltage power-on disable signal, a DCDC disable signal, etc., wherein the detection signal can only include one of the low-voltage power-on enable signal and the low-voltage power-on disable signal and / or one of the DCDC enable signal and the DCDC disable signal, to correspond to different states of the power supply circuit. The low-voltage power-on enable signal indicates that the switching power supply module is powered on, the low-voltage power-on disable signal indicates that the switching power supply module is not powered on, and the DCDC disable signal indicates that the DCDC circuit is not controlled to work; when the power supply circuit is applied to the vehicle power supply, the low-voltage power-on enable signal is the ignition signal, and on the contrary, the low-voltage power-on disable signal is the non-ignition signal. Specifically, when the detection signal provided in the embodiment of the utility model includes a low-voltage power-on disable signal and a DCDC disable signal, it indicates that the power supply circuit is in sleep mode, and the switch signal is a signal that controls the switch circuit to disconnect the DC power supply path and disconnect the battery power supply path. That is, when the switch circuit includes the first switch to the fourth switch provided in the above embodiment, the switch signal controls the first switch and the second switch to be disconnected, and controls the third switch and the fourth switch to be disconnected at the same time.

[0054] Alternatively, when the detection signal includes a power-on enable signal and the DCDC disable signal, it indicates that the power circuit is in standby mode, and the switch signal is a signal for controlling the switch circuit to disconnect the DC power supply path and connect the battery power supply path. That is, when the switch circuit includes the first switch to the fourth switch provided in the above embodiment, the switch signal controls the first switch and the second switch to close, and controls the third switch and the fourth switch to open, so as to power the switch power module through the low-voltage battery.

[0055] Alternatively, when the detection signal includes the power-on enable signal and the DCDC enable signal, it indicates that the power supply circuit is in the first working mode, and the switch signal is a signal for controlling the switch circuit to connect the DC power supply path and disconnect the battery power supply path. That is, when the switch circuit includes the first switch to the fourth switch provided in the above embodiment, the switch signal controls the first switch and the second switch to be disconnected, and controls the third switch and the fourth switch to be closed, and the direct current output by the DCDC circuit directly passes through the third switch and the fourth switch to supply power to the switch power supply module, disconnecting the path for the low-voltage battery to supply power to the switch power supply module.

[0056] Alternatively, when the detection signal includes the power-on non-enable signal and the DCDC enable signal, it indicates that the power supply circuit is in the first working mode, and the switch signal is a signal for controlling the switch circuit to connect the DC power supply path and disconnect the battery power supply path. That is, when the switch circuit includes the first switch to the fourth switch provided in the above embodiment, the switch signal controls the first switch and the second switch to be disconnected, and controls the third switch and the fourth switch to be closed, and the direct current output by the DCDC circuit directly passes through the third switch and the fourth switch to power the switch power supply module, disconnecting the path for the low-voltage battery to power the switch power supply module.

[0057] Furthermore, when the detection signal provided in the embodiment of the utility model includes a DCDC enable signal, the battery power supply path can be connected first to power the switching power supply module through the low-voltage battery, and then the DC power supply path can be controlled to be connected. After the DCDC circuit performs some actions such as initialization and works stably, the battery power supply path can be disconnected. That is, when the detection signal provided in the embodiment of the utility model includes the DCDC enable signal, the switch signal is a signal that controls the switch circuit to connect the battery power supply path and then connect the DC power supply path, and controls the DC power supply path to be disconnected after the battery power supply path is connected for a set time. That is, when the switch circuit includes the first switch to the fourth switch provided in the above embodiment, the switch signal first controls the first switch and the second switch to be closed, and then controls the third switch and the fourth switch to be closed. After the third switch and the fourth switch are closed for a set time, the first switch and the second switch are controlled to be disconnected. Furthermore, when the DCDC circuit is not working stably, the switching power supply module is powered by a low-voltage battery to improve the timeliness and stability of the power supply. Then, after the DCDC circuit is working stably, the battery power supply path is disconnected while the DC power supply path is kept connected, thereby improving the coupling problem between the DCDC circuit output harness and the switching power supply module input display, shortening the length of the transmission harness for powering the switching power supply module, reducing the power loss on the transmission harness and improving the efficiency of the power supply circuit, and also suppressing the strong transmitted emission and radiated emission problems generated by the transmission harness, reducing the noise of the power supply circuit, and improving the reliability of the power supply circuit.

[0058] In an embodiment of the present invention, the first switch, the second switch, the third switch and the fourth switch provided in the embodiment of the present invention may be switch tubes or other types of controllable switches, and the present invention does not impose any specific limitation on this.

[0059] refer to Figure 4As shown, it is a circuit diagram of another power supply circuit provided by an embodiment of the utility model, wherein the power supply circuit provided by the embodiment of the utility model can also be provided with some anti-reverse devices in the circuit, so as to perform power supply anti-reverse protection through the anti-reverse devices, thereby improving the reliability and safety of the power supply circuit. Specifically, the switch circuit 200 also includes a first anti-reverse device D1, a second anti-reverse device D2, a third anti-reverse device D3 and a fourth anti-reverse device D4. Among them, the first anti-reverse device D1 and the first switch K1 are connected in series between the positive pole KL30 of the low-voltage power supply interface and the positive pole of the input end of the switching power supply module 400, such as the anode of the first anti-reverse device D1 is electrically connected to the first end of the first switch K1, and the cathode of the first anti-reverse device D1 is electrically connected to the positive pole of the input end of the switching power supply module 400. The second anti-reverse device D2 and the second switch K2 are connected in series between the negative electrode KL31 of the low-voltage power supply interface and the negative electrode of the input end of the switching power supply module 400, such as the cathode of the second anti-reverse device D2 is electrically connected to the first end of the second switch K2, and the anode of the second anti-reverse device D2 is electrically connected to the negative electrode of the input end of the switching power supply module 400.

[0060] The third anti-reverse device D3 and the third switch K3 are connected in series between the positive electrode of the output terminal of the DCDC circuit 100 and the positive electrode of the input terminal of the switching power module 400, such as the anode of the third anti-reverse device D3 is electrically connected to the positive electrode of the output terminal of the DCDC circuit 100, and the cathode of the third anti-reverse device D3 is electrically connected to the cathode of the first anti-reverse device D1 and the positive electrode of the input terminal of the switching power module 400. The fourth anti-reverse device D4 and the fourth switch K4 are connected in series between the negative electrode of the output terminal of the DCDC circuit 100 and the negative electrode of the input terminal of the switching power module 400, such as the cathode of the fourth anti-reverse device D4 is electrically connected to the output terminal of the DCDC circuit 100, and the anode of the fourth anti-reverse device D4 is electrically connected to the anode of the second anti-reverse device D2 and the negative electrode of the input terminal of the switching power module 400.

[0061] Continue as Figure 4As shown, the power supply circuit provided by the embodiment of the utility model further includes: a fifth anti-reverse device D5 and a sixth anti-reverse device D6. The fifth anti-reverse device D5 is connected in series between the positive electrode of the output terminal of the DCDC circuit 100 and the positive electrode LVDC+ of the low-voltage output interface, such as the anode of the fifth anti-reverse device D5 is electrically connected to the positive electrode of the output terminal of the DCDC circuit 100, and the cathode of the fifth anti-reverse device D5 is electrically connected to the second end of the third switch K3 and the positive electrode LVDC+ of the low-voltage output interface. The sixth anti-reverse device D6 is connected in series between the negative electrode of the output terminal of the DCDC circuit 100 and the negative electrode KVDC- of the low-voltage output interface, such as the cathode of the sixth anti-reverse device D6 is electrically connected to the negative electrode of the output terminal of the DCDC circuit 100, and the anode of the sixth anti-reverse device D6 is electrically connected to the second end of the fourth switch K4 and the negative electrode LVDC- of the low-voltage output interface.

[0062] In one embodiment of the utility model, the anti-reverse device provided in the embodiment of the utility model can be an anti-reverse diode, that is, at least one of the first anti-reverse device, the second anti-reverse device, the third anti-reverse device, the fourth anti-reverse device, the fifth anti-reverse device and the sixth anti-reverse device is an anti-reverse diode, and the utility model does not make any specific restrictions on this.

[0063] In order to further improve the performance of the power supply circuit, the power supply circuit provided by the embodiment of the utility model can also be provided with some filter circuits at the interface. Figure 5 As shown, it is a circuit diagram of another power supply circuit provided by an embodiment of the utility model, wherein the power supply circuit provided by the embodiment of the utility model further includes: a power supply filter circuit 810, the power supply filter circuit 810 is electrically connected between the power supply interface LN and the input end of the OBC circuit 800. And / or, a low-voltage output filter circuit 110, the low-voltage output filter circuit 110 is electrically connected between the low-voltage output interface and the output end of the DCDC circuit 100, and the low-voltage output filter circuit 110 is preferably electrically connected between the connection end of the switch circuit 200 and the DCDC circuit 100 and the low-voltage output interface, thereby avoiding increasing the wiring harness length of the DC power supply path. And / or, a low-voltage power supply filter circuit 410, the low-voltage power supply filter circuit 410 is electrically connected between the low-voltage power supply interface and the input end of the switch power module 400; similarly, the low-voltage power supply filter circuit 410 is electrically connected between the switch circuit 200 and the low-voltage power supply interface to avoid increasing the wiring harness length of the DC power supply path. and / or, a high-voltage filter circuit 820, the high-voltage filter circuit 820 being electrically connected between the high-voltage transmission interface and the input end of the DCDC circuit 100 and the output end of the OBC circuit 800. and / or, a signal detection filter circuit 310, the signal detection filter circuit 310 being electrically connected between the signal detection module SN and the control end of the processing circuit 300.

[0064] It can be understood that the power supply circuit provided by the embodiment of the utility model may include any one of a power supply filter circuit, a low-voltage output filter circuit, a low-voltage power supply filter circuit and a signal detection filter circuit. In addition, the power supply circuit may also include any combination of a power supply filter circuit, a low-voltage output filter circuit, a low-voltage power supply filter circuit and a signal detection filter circuit, such as the power supply circuit includes a combination of two of the circuits: the power supply circuit includes a combination of a power supply filter circuit and a low-voltage output filter circuit, or the power supply circuit includes a combination of a power supply filter circuit and a low-voltage power supply filter circuit, or the power supply circuit includes a combination of a power supply filter circuit and a signal detection filter circuit, or the power supply circuit includes a combination of a low-voltage output filter circuit and a low-voltage power supply filter circuit, or the power supply circuit includes a combination of a low-voltage output filter circuit and a low-voltage power supply filter circuit, or the power supply circuit includes a combination of a low-voltage output filter circuit and a signal detection filter circuit, or the power supply circuit includes a combination of a low-voltage power supply filter circuit and a signal detection filter circuit. A combination of detection filter circuits; such as a power supply circuit including a combination of three of these circuits: the power supply circuit includes a combination of a power supply filter circuit, a low-voltage output filter circuit and a low-voltage power supply filter circuit, or the power supply circuit includes a combination of a power supply filter circuit, a low-voltage output filter circuit and a signal detection filter circuit, or the power supply circuit includes a combination of a power supply filter circuit, a low-voltage power supply filter circuit and a signal detection filter circuit, or the power supply circuit includes a combination of a low-voltage output filter circuit, a low-voltage power supply filter circuit and a signal detection filter circuit; such as a power supply circuit includes a combination of four circuits: a power supply filter circuit, a low-voltage output filter circuit, a low-voltage power supply filter circuit and a signal detection filter circuit, which needs to be specifically designed according to the actual application.

[0065] It should be noted that the power supply circuit provided in the embodiment of the utility model may also include some other signal interfaces, and corresponding filter circuits may also be provided at the other signal interfaces, and the utility model does not make specific restrictions on this. Figure 5 As shown, a low-voltage LISN (Line Impedance Stabilization Network) circuit 420 can be electrically connected between the switching power supply module 400 and the low-voltage battery 600 of the power supply circuit provided by the embodiment of the utility model, and the low-voltage LISN circuit 420 can be specifically electrically connected between the low-voltage battery 600 and the low-voltage power supply interface to further improve the performance of the power supply circuit.

[0066] In addition, the embodiments of the present invention do not limit the specific composition and connection relationship of the OBC circuit and the DCDC circuit. Figure 6The device composition and connection structure of a DCDC circuit 100 and an OBC circuit 800 shown are only one of all the circuits applicable to the utility model, and a specific design is required according to the actual application. Optionally, at least one of the power interface, high-voltage transmission interface, low-voltage output interface and low-voltage power supply interface provided in the embodiment of the utility model can also be provided with an EMC (Electro Magnetic Compatibility) device to further improve the performance of the power supply circuit in suppressing EMI. Among them, the power supply filter circuit, the low-voltage output filter circuit, the low-voltage power supply filter circuit and the high-voltage filter circuit can be correspondingly provided in a matching EMC device, and the utility model does not make specific restrictions on this.

[0067] Based on the same inventive concept, the embodiment of the utility model further provides a vehicle, the vehicle includes the power circuit provided by any of the above embodiments. Optionally, the vehicle provided by the embodiment of the utility model includes an electric vehicle, the electric vehicle includes an on-board power supply, wherein the power circuit is applied to the on-board power supply.

[0068] The embodiment of the utility model provides a power supply circuit and a vehicle, wherein the power supply circuit includes a high-voltage transmission interface, a DCDC circuit, a low-voltage output interface, a low-voltage power supply interface, a switch circuit, a processing circuit, a signal detection module and a switch power supply module, wherein the switch circuit is connected to a switch signal, and the switch circuit is electrically connected between the output end of the DCDC circuit and the input end of the switch power supply module, and the switch circuit is also electrically connected between the low-voltage power supply interface and the input end of the switch power supply module. When the detection signal includes a DCDC enable signal, the switch signal is a signal for controlling the switch circuit to connect the DC power supply path between the output end of the DCDC circuit and the input end of the switch power supply module, and for controlling the switch circuit to disconnect the battery power supply path between the low-voltage power supply interface and the input end of the switch power supply module.

[0069] It can be seen from the above content that the technical solution provided by the embodiment of the utility model is designed to electrically connect the switch circuit between the output end of the DCDC circuit and the input end of the switching power module, and at the same time electrically connect between the low-voltage power supply interface and the input end of the switching power module. When the DCDC circuit needs to respond to the DCDC enable signal to work, the switch circuit controls the DC power supply path to be connected, and the switch circuit also controls the battery power supply path to be disconnected, so that the output wiring harness of the DCDC circuit is connected to the input wiring harness of the switching power module, and the switching power module is directly powered by the direct current output by the DCDC circuit, which improves the coupling between the output wiring harness of the DCDC circuit and the input wiring harness of the switching power module, improves the EMI problem of the power supply circuit, and improves the reliability of the power supply circuit.

[0070] Furthermore, the switching power supply module is directly powered by the DC power output by the DCDC circuit, which reduces the use time of the low-voltage battery and increases its service life. Compared with the circuit that transmits the DC power to the low-voltage battery and then uses the low-voltage battery to power the switching power supply module, the length of the transmission harness that powers the switching power supply module is shortened, which can not only reduce the power loss on the transmission harness and improve the efficiency of the power supply circuit, but also suppress the strong transmission and radiation emission problems generated by the transmission harness, reducing the noise of the power supply circuit.

[0071] In the description of the present invention, it should be understood that the orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0072] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0073] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0075] In the present utility model, if the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0076] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A power supply circuit, characterized in that: include: Switching circuit, processing circuit, signal detection module and switching power supply module; The detection end of the processing circuit is electrically connected to the signal detection module, and the signal detection module is used to access the detection signal. The output end of the processing circuit is electrically connected to the control end of the switch circuit and outputs a switch signal; the switch circuit is electrically connected between the output end of the DCDC circuit and the input end of the switch power module, and the switch circuit is also electrically connected between the low-voltage power supply interface and the input end of the switch power module. The switch signal is a signal for controlling the switch circuit to connect the DC power supply path between the output end of the DCDC circuit and the input end of the switch power module, and a signal for controlling the switch circuit to disconnect the battery power supply path between the low-voltage power supply interface and the input end of the switch power module.

2. The power supply circuit according to claim 1, characterized in that: The switch circuit includes a first switch, a second switch, a third switch and a fourth switch; The first end of the first switch and the first end of the third switch are both electrically connected to the positive input terminal of the switching power module, and the first end of the second switch and the second end of the fourth switch are both electrically connected to the negative input terminal of the switching power module; The second end of the first switch is electrically connected to the positive pole of the low-voltage power supply interface, the second end of the second switch is electrically connected to the negative pole of the low-voltage power supply interface, the second end of the third switch is electrically connected to the positive pole of the output end of the DCDC circuit, and the second end of the fourth switch is electrically connected to the negative pole of the output end of the DCDC circuit.

3. The power supply circuit according to claim 2, characterized in that: The switch circuit also includes a first anti-reverse device, a second anti-reverse device, a third anti-reverse device and a fourth anti-reverse device; The first anti-reverse device and the first switch are connected in series between the positive electrode of the low-voltage power supply interface and the positive electrode of the input end of the switching power supply module, and the second anti-reverse device and the second switch are connected in series between the negative electrode of the low-voltage power supply interface and the negative electrode of the input end of the switching power supply module; The third anti-reverse device and the third switch are connected in series between the positive pole of the output end of the DCDC circuit and the positive pole of the input end of the switching power module, and the fourth anti-reverse device and the fourth switch are connected in series between the negative pole of the output end of the DCDC circuit and the negative pole of the input end of the switching power module.

4. The power supply circuit according to claim 1, characterized in that: The power supply circuit further includes: a fifth anti-reverse device and a sixth anti-reverse device; The fifth anti-reverse device is connected in series between the positive pole of the output end of the DCDC circuit and the positive pole of the low-voltage output interface, and the sixth anti-reverse device is connected in series between the negative pole of the output end of the DCDC circuit and the negative pole of the low-voltage output interface.

5. The power supply circuit according to claim 3 or 4, characterized in that: Any reverse protection device includes a reverse protection diode.

6. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes: a power supply interface and an OBC circuit; The power supply interface is used to access a charging power supply, the input end of the OBC circuit is electrically connected to the power supply interface, and the output end of the OBC circuit is electrically connected to a high-voltage transmission interface.

7. The power supply circuit according to claim 6, characterized in that: The power supply circuit further includes: a power supply filter circuit, wherein the power supply filter circuit is electrically connected between the power supply interface and an input end of the OBC circuit; and / or, a low voltage output filter circuit, the low voltage output filter circuit being electrically connected between the low voltage output interface and the output end of the DCDC circuit; and / or, a low-voltage power supply filter circuit, wherein the low-voltage power supply filter circuit is electrically connected between the low-voltage power supply interface and an input end of the switching power supply module; and / or, a high-voltage filter circuit, the high-voltage filter circuit being electrically connected between the high-voltage transmission interface and the input end of the DCDC circuit and the output end of the OBC circuit; And / or, a signal detection filter circuit, wherein the signal detection filter circuit is electrically connected between the signal detection module and a control end of the processing circuit.

8. The power supply circuit according to claim 1, characterized in that: The power supply circuit further includes a low voltage LISN circuit, and the low voltage LISN circuit is electrically connected between the switching power supply module and a low voltage battery.

9. The power supply circuit according to claim 1, characterized in that: The switch signal is a signal for controlling the switch circuit to connect the battery power supply path and then connect the DC power supply path, and to control the switch circuit to disconnect the battery power supply path after connecting the DC power supply path for a set time.

10. A means of transport, characterized in that: The vehicle comprises the power supply circuit according to any one of claims 1-9.

11. The vehicle according to claim 10, characterized in that: The transportation vehicle includes an electric car.

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