Vehicle-mounted power supply circuit and vehicle

Abstract

The utility model provides a vehicle-mounted power supply circuit and a vehicle, the vehicle-mounted power supply circuit comprises a DCDC conversion circuit, the DCDC conversion circuit comprises a secondary side first conversion sub-circuit and an anti-reverse connection device, the anti-reverse connection device is arranged between a low-voltage positive electrode and a low-voltage negative electrode of the secondary side first conversion sub-circuit, and the secondary side first conversion sub-circuit is connected with the anti-reverse connection device; according to the utility model, when the reverse connection of the low-voltage positive electrode and the low-voltage negative electrode occurs due to misoperation, the reverse connection can be timely switched off, the circuit fault probability is reduced, and the requirements on the overcurrent capability and the conduction impedance of the MOS tube are reduced, so that the cost of the MOS tube is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to a vehicle-mounted power supply circuit and a vehicle. Background Art

[0002] In the related art, in order to prevent the circuit from malfunctioning when the positive and negative poles of the DCDC conversion circuit output are reversed, a MOS (metal, oxide, semiconductor, metal oxide semiconductor field effect transistor) tube is connected in series in the main loop of the DCDC conversion circuit. The MOS tube is required to have a large current capacity and a low on-resistance, which leads to an increase in the cost of the MOS tube. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art.

[0004] To this end, one purpose of the utility model is to propose a vehicle-mounted power supply circuit, which can be shut down in time when the low-voltage positive pole and the low-voltage negative pole are reversed due to misoperation, thereby reducing the probability of circuit failure and reducing the requirements for the overcurrent capacity and on-resistance of the MOS tube, thereby reducing the cost of the MOS tube.

[0005] To this end, a second objective of the present invention is to provide a vehicle.

[0006] In order to achieve the above-mentioned purpose, an embodiment of the first aspect of the utility model proposes a vehicle-mounted power supply circuit, which includes: a DCDC conversion circuit, the DCDC conversion circuit includes a secondary side first conversion sub-circuit and an anti-reverse connection device, the anti-reverse connection device is arranged between the low-voltage positive pole and the low-voltage negative pole of the secondary side first conversion sub-circuit, and the anti-reverse connection device is used to shut down when the low-voltage positive pole and the low-voltage negative pole are reversed.

[0007] According to the vehicle power supply circuit of the embodiment of the utility model, the charging function of the vehicle power supply circuit is realized by setting a DCDC conversion circuit to charge the device to be charged, that is, a battery, or to charge the power load in a discharge state, and an anti-reverse connection device is set between the low-voltage positive electrode and the low-voltage negative electrode of the first conversion sub-circuit on the secondary side. When the low-voltage positive electrode and the low-voltage negative electrode are reversely connected due to misoperation, they can be shut down in time, thereby reducing the probability of circuit failure and reducing the requirements for the overcurrent capacity and conduction impedance of the MOS tube, thereby reducing the cost of the MOS tube.

[0008] In some embodiments, the reverse connection protection device includes a first MOS transistor.

[0009] In some embodiments, the DCDC conversion circuit includes: a PFC conversion subcircuit, one end of which is connected to the AC charging port; a conversion subcircuit, a first end of which is connected to the other end of the PFC conversion subcircuit, and the other end of which is connected to the device to be charged.

[0010] In some embodiments, the device to be charged includes a first device to be charged, and the conversion subcircuit includes: a primary conversion subcircuit, one end of the primary conversion subcircuit is connected to the other end of the PFC conversion subcircuit; a magnetic integrated transformer, the primary winding of the magnetic integrated transformer is connected to the other end of the primary conversion subcircuit; the secondary first conversion subcircuit, one end of the secondary first conversion subcircuit is connected to the secondary second winding of the magnetic integrated transformer, and the other end of the secondary first conversion subcircuit is connected to the first device to be charged.

[0011] In some embodiments, the device to be charged also includes a second device to be charged, and the conversion subcircuit also includes: a secondary side second conversion subcircuit, one end of the secondary side second conversion subcircuit is connected to the secondary first winding of the magnetic integrated transformer, and the other end of the secondary side second conversion subcircuit is connected to the second device to be charged.

[0012] In some embodiments, the secondary side first conversion subcircuit includes: a rectifier circuit, a first end of the rectifier circuit is connected to the first output end of the secondary second winding of the magnetic integrated transformer, and a second end of the rectifier circuit is connected to the second output end of the secondary second winding of the magnetic integrated transformer; a step-down subcircuit, a first end of the step-down subcircuit is connected to the fourth end of the rectifier circuit, and a second end of the step-down subcircuit is connected to the third end of the rectifier circuit.

[0013] In some embodiments, the step-down sub-circuit includes: a first step-down sub-circuit, a first end of the first step-down sub-circuit is connected to the fourth end of the rectifier sub-circuit, a second end of the first step-down sub-circuit is connected to the third end of the rectifier sub-circuit, a third end of the first step-down sub-circuit is connected to the low-voltage negative electrode, and a fourth end of the first step-down sub-circuit is connected to the low-voltage positive electrode; a second step-down sub-circuit, one end of the second step-down sub-circuit is connected to the fifth end of the first step-down sub-circuit, and the other end of the second step-down sub-circuit is connected to the third end of the rectifier sub-circuit.

[0014] In some embodiments, the first step-down sub-circuit includes: a second MOS tube, one end of which is connected to the fourth end of the rectifier circuit; an inductor, a first end of which is connected to the other end of the second MOS tube, and a second end of which is connected to the low-voltage positive electrode.

[0015] In some embodiments, the second step-down sub-circuit includes: a third MOS tube, one end of which is connected to the fifth end of the first step-down sub-circuit; and the first MOS tube, one end of which is connected to the other end of the third MOS tube, and the other end of which is connected to the third end of the rectifier sub-circuit.

[0016] In some embodiments, the step-down sub-circuit further includes: a capacitor, one end of which is connected to the second end of the inductor, and the other end of which is connected to the third end of the rectifier sub-circuit.

[0017] In order to achieve the above-mentioned object, an embodiment of a second aspect of the present utility model provides a vehicle, and the vehicle comprises: the on-board power supply circuit as described in the above-mentioned embodiment.

[0018] According to the vehicle of the embodiment of the utility model, a charging function of the vehicle power supply circuit is realized by setting a DCDC conversion circuit to charge the device to be charged, i.e., a battery, or to charge the power load in a discharge state, and an anti-reverse connection device is set between the low-voltage positive electrode and the low-voltage negative electrode of the first conversion sub-circuit on the secondary side. When the low-voltage positive electrode and the low-voltage negative electrode are reversely connected due to misoperation, the device can be shut down in time, thereby reducing the probability of circuit failure and reducing the requirements for the overcurrent capacity and on-resistance of the MOS tube, thereby reducing the cost of the MOS tube.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 It is a structural block diagram of a vehicle-mounted power supply circuit according to a specific embodiment of the utility model;

[0022] Figure 2 It is a structural block diagram of a vehicle-mounted power supply circuit according to a specific embodiment of the utility model;

[0023] Figure 3 is a circuit diagram of a vehicle-mounted power supply circuit according to an embodiment of the utility model;

[0024] Figure 4 It is a partial circuit diagram of a vehicle-mounted power supply circuit according to an embodiment of the utility model;

[0025] Figure 5It is a structural block diagram of a vehicle-mounted power supply circuit according to a specific embodiment of the utility model;

[0026] Figure 6 It is a structural block diagram of a vehicle-mounted power supply circuit according to a specific embodiment of the utility model;

[0027] Figure 7 It is a structural block diagram of a vehicle according to an embodiment of the utility model.

[0028] Reference numerals:

[0029] On-board power supply circuit 10;

[0030] Secondary side first conversion sub-circuit 1;

[0031] PFC conversion sub-circuit 11;

[0032] Primary side conversion subcircuit 12; magnetic integrated transformer 13;

[0033] A secondary side second conversion sub-circuit 14;

[0034] Rectifier circuit 111; Buck circuit 112;

[0035] A second step-down sub-circuit 122;

[0036] Vehicle 100. DETAILED DESCRIPTION

[0037] The embodiments of the present utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present utility model are described in detail below.

[0038] Reference below Figure 1-Figure 6 The vehicle-mounted power supply circuit 10 according to the embodiment of the present invention is described.

[0039] like Figure 1-Figure 6 As shown, the vehicle-mounted power supply circuit 10 of the embodiment of the utility model includes: a DCDC conversion circuit, the DCDC conversion circuit includes a secondary side first conversion sub-circuit 1 and an anti-reverse connection device, wherein the anti-reverse connection device is arranged between the low-voltage positive pole and the low-voltage negative pole of the secondary side first conversion sub-circuit 1, and the anti-reverse connection device is used to shut down when the low-voltage positive pole and the low-voltage negative pole are reversed.

[0040] In an embodiment, Figure 1, which is a structural block diagram of a vehicle-mounted power supply circuit of a specific embodiment of the utility model. When the DCDC conversion circuit is working in the forward direction, for example, when the DCDC conversion circuit is charging the device to be charged, i.e., the battery, the DCDC conversion circuit receives the external AC power supply, i.e., the AC input AC power supply, and then steps down and rectifies the AC voltage, outputs a corresponding low-voltage DC charging signal to the battery, and charges the battery, thereby realizing the charging function of the vehicle-mounted power supply circuit 10.

[0041] Or Figure 2 , which is a structural block diagram of a vehicle power supply circuit of a specific embodiment of the utility model. When the DCDC conversion circuit works in reverse, for example, when the DCDC conversion circuit charges the power load in the discharge state, the DCDC conversion subcircuit receives the high-voltage DC signal output by the power battery, steps down and rectifies the high-voltage DC signal, and outputs the corresponding low-voltage DC power supply signal to the power load to charge the power load, thereby realizing the function of charging the power load for the vehicle power supply circuit 10 in the discharge state.

[0042] like Figure 3 The figure is a circuit diagram of a vehicle-mounted power supply circuit of an embodiment of the utility model. An anti-reverse connection device is provided between the low-voltage positive electrode LV+ and the low-voltage negative electrode LV- of the secondary side first conversion sub-circuit 1 of the DCDC conversion circuit, which can be turned off in time when the low-voltage positive electrode LV+ and the low-voltage negative electrode LV- are reversely connected due to misoperation, thereby reducing the probability of circuit failure, and having lower requirements on the overcurrent capacity and on-resistance of the MOS tube, thereby reducing the cost of the MOS tube.

[0043] According to the vehicle power supply circuit 10 of the embodiment of the utility model, the charging function of the vehicle power supply circuit 10 is realized by setting a DCDC conversion circuit to charge the device to be charged, that is, a battery, or to charge the power load in a discharge state, and an anti-reverse connection device is set between the low-voltage positive electrode and the low-voltage negative electrode of the secondary side first conversion sub-circuit 1. When the low-voltage positive electrode and the low-voltage negative electrode are reversely connected due to misoperation, they can be shut down in time, thereby reducing the probability of circuit failure and reducing the requirements for the overcurrent capacity and on-resistance of the MOS tube, thereby reducing the cost of the MOS tube.

[0044] In some embodiments, Figure 3 and Figure 4 As shown, the reverse connection protection device includes a first MOS tube, for example, denoted as Q1. When the low-voltage positive electrode LV+ and the low-voltage negative electrode LV- of the secondary side first conversion sub-circuit 1 are reversely connected due to misoperation, the first MOS tube Q1 is in a turned-off state, so that the loop cannot be turned on, thereby preventing the secondary side first conversion sub-circuit 1 from malfunctioning, thereby realizing preventive protection of the DCDC conversion circuit.

[0045] In some embodiments, Figure 5As shown, the DCDC conversion circuit includes: a PFC conversion subcircuit 11 and a conversion subcircuit, wherein one end of the PFC conversion subcircuit 11 is connected to the AC charging port; the first end of the conversion subcircuit is connected to the other end of the PFC conversion subcircuit 11, and the other end of the conversion subcircuit is connected to the device to be charged.

[0046] In an embodiment, Figure 3 and Figure 4 As shown, when the DCDC conversion circuit works in the forward direction, for example, when the DCDC conversion circuit charges the battery, one end of the PFC conversion sub-circuit 11 is connected to the AC charging port, receives the external AC power supply, i.e., the AC power supply input by the AC, and converts it into a first high-voltage DC signal for output; the first end of the conversion sub-circuit is connected to the other end of the PFC conversion sub-circuit 11, receives the first high-voltage DC signal output by the PFC conversion sub-circuit 11, converts it into a low-voltage DC charging signal and outputs it to the battery, thereby realizing the charging function of the vehicle power supply circuit 10 for the battery.

[0047] Alternatively, when the DCDC conversion circuit is working in the forward direction, for example, when the DCDC conversion circuit is charging the power battery, one end of the PFC conversion sub-circuit 11 is connected to the AC charging port, receives an external AC power source, i.e., an AC input AC power source, and converts it into a first high-voltage DC signal for output; the first end of the conversion sub-circuit is connected to the other end of the PFC conversion sub-circuit 11, receives the first high-voltage DC signal output by the PFC conversion sub-circuit 11, converts it into a high-voltage DC charging signal and outputs it to the power battery, thereby realizing the charging function of the vehicle power supply circuit 10 for the power battery.

[0048] Alternatively, when the DCDC conversion circuit works in reverse, for example, when the DCDC conversion circuit charges the electrical load in a discharge state, the other end of the conversion sub-circuit is connected to the device to be charged, i.e., the power battery, and receives the third high-voltage DC signal output by the second device to be charged, i.e., the power battery, converts it into a low-voltage DC power supply signal and outputs it to the electrical load to charge the electrical load, thereby realizing the charging function of the vehicle power supply circuit 10 for the electrical load in a discharge state.

[0049] Alternatively, when the DCDC conversion circuit works in reverse, for example, when the DCDC conversion circuit charges an external load in a discharge state, the other end of the conversion sub-circuit is connected to the device to be charged, i.e., the power battery, and receives the third high-voltage DC signal output by the second device to be charged, i.e., the power battery, converts it into an AC power supply signal and outputs it to the external load to charge the external load, thereby realizing the function of the vehicle power supply circuit 10 to charge the external load in a discharge state.

[0050] In some embodiments, Figure 6As shown, the device to be charged includes a first device to be charged, and the conversion subcircuit includes: a primary side conversion subcircuit 12, a magnetic integrated transformer 13 and a secondary side first conversion subcircuit 1, wherein:

[0051] One end of the primary conversion subcircuit 12 is connected to the other end of the PFC conversion subcircuit 11; the primary winding of the magnetic integrated transformer 13 is connected to the other end of the primary conversion subcircuit 12; one end of the secondary first conversion subcircuit 1 is connected to the secondary second winding of the magnetic integrated transformer 13, and the other end of the secondary first conversion subcircuit 1 is connected to the first device to be charged.

[0052] In an embodiment, Figure 3 and Figure 4 As shown, when the DCDC conversion circuit works in the forward direction, for example, when the DCDC conversion circuit charges the first device to be charged, i.e., a battery, one end of the PFC conversion subcircuit 11 is connected to the AC charging port, receives an external AC power source, i.e., an AC input AC power source, and converts it into a first high-voltage DC signal for output; one end of the primary conversion subcircuit 12 in the conversion subcircuit is connected to the other end of the PFC conversion subcircuit 11, receives the first high-voltage DC signal output by the PFC conversion subcircuit 11, converts it into a first high-voltage square wave electrical signal, i.e., an AC square wave electrical signal, and outputs it; the primary winding of the magnetic integrated transformer 13 is connected to the other end of the primary conversion subcircuit 12, and then connected to the secondary first conversion subcircuit 1 through the secondary second winding of the magnetic integrated transformer 13, the secondary first conversion subcircuit 1 receives the first high-voltage square wave electrical signal, i.e., an AC square wave electrical signal, output by the primary conversion subcircuit 12, converts it into a low-voltage DC charging signal and outputs it to the first device to be charged, so as to charge the first device to be charged, i.e., a battery, thereby realizing the charging function of the vehicle power supply circuit 10 for the first device to be charged in the discharge state.

[0053] Alternatively, when the DCDC conversion circuit works in reverse, for example, when the DCDC conversion circuit charges the electrical load in a discharge state, the secondary side second conversion sub-circuit 14 receives the third high-voltage DC signal output by the second device to be charged, i.e., the power battery, and converts it into a second high-voltage square wave electrical signal, i.e., an AC square wave electrical signal, which is then magnetically linked to the secondary side first conversion sub-circuit 1 through the magnetic integrated transformer 13. The secondary side first conversion sub-circuit 1 receives the second high-voltage square wave electrical signal, i.e., the AC square wave electrical signal, output by the secondary side second conversion sub-circuit 14, and converts it into a low-voltage DC power supply signal, which is output to the first device to be charged, i.e., the electrical load, to charge the first device to be charged, i.e., the electrical load, thereby realizing the charging function of the vehicle power supply circuit 10 for the first device to be charged in a discharge state.

[0054] In some embodiments, the device to be charged also includes a second device to be charged, and the conversion subcircuit also includes: a secondary side second conversion subcircuit 14, one end of the secondary side second conversion subcircuit 14 is connected to the secondary first winding of the magnetic integrated transformer 13, and the other end of the secondary side second conversion subcircuit 14 is connected to the second device to be charged.

[0055] In an embodiment, Figure 3 and Figure 4 As shown, when the DCDC conversion circuit works in the forward direction, for example, when the DCDC conversion circuit charges the second device to be charged, namely, the power battery, one end of the primary conversion subcircuit 12 in the conversion subcircuit is connected to the other end of the PFC conversion subcircuit 11, receives the first high-voltage DC signal output by the PFC conversion subcircuit 11, converts it into a first high-voltage square wave signal, namely, an AC square wave signal, and outputs it; the primary winding of the magnetic integrated transformer 13 is connected to the other end of the primary conversion subcircuit 12, and then connected to the secondary second conversion subcircuit 14 through the secondary second winding of the magnetic integrated transformer 13, and the secondary second conversion subcircuit 14 receives the first high-voltage square wave signal output by the primary conversion subcircuit 12, namely, the AC square wave signal, converts it into a high-voltage DC charging signal and outputs it to the second device to be charged, so as to charge the second device to be charged, namely, the power battery, thereby realizing the charging function of the vehicle power supply circuit 10 for the second device to be charged.

[0056] Alternatively, when the DCDC conversion circuit works in reverse, for example, when the DCDC conversion circuit charges an external load in a discharge state, the other end of the secondary side second conversion subcircuit 14 in the conversion subcircuit is connected to the second device to be charged, receives the third high-voltage DC signal output by the second device to be charged, i.e., the power battery, and converts it into a second high-voltage square wave electrical signal, i.e., an AC square wave electrical signal. The secondary second winding of the magnetic integrated transformer 13 is connected to the secondary side second conversion subcircuit 14, and then connected to the other end of the primary side conversion subcircuit 12 through the primary winding of the magnetic integrated transformer 13. The primary side conversion subcircuit 12 receives the second high-voltage square wave electrical signal, i.e., the AC square wave electrical signal output by the secondary side second conversion subcircuit 14, and converts it into a second high-voltage DC signal. After receiving the second high-voltage DC signal, the PFC conversion subcircuit 11 converts it into an AC power supply signal and outputs it to the external load to charge the external load, thereby realizing the charging function of the vehicle power supply circuit 10 for the power load in a discharge state.

[0057] In some embodiments, Figure 4 and Figure 5 As shown, the secondary side first conversion subcircuit 1 includes: a rectifier subcircuit 111 and a step-down subcircuit 112, wherein:

[0058] The first end of the rectifier circuit 111 is connected to the first output end of the secondary second winding of the magnetic integrated transformer 13, and the second end of the rectifier circuit 111 is connected to the second output end of the secondary second winding of the magnetic integrated transformer 13; the first end of the step-down sub-circuit 112 is connected to the fourth end of the rectifier circuit 111, and the second end of the step-down sub-circuit 112 is connected to the third end of the rectifier circuit 111.

[0059] In an embodiment, Figure 3 and Figure 4 As shown, when the DCDC conversion circuit works in the forward direction, for example, when the DCDC conversion circuit is the first device to be charged, i.e., a battery, the first end of the rectifier circuit 111 in the secondary first conversion subcircuit 1 is connected to the first output end of the secondary second winding of the magnetic integrated transformer 13, receives the first high-voltage square wave electrical signal, i.e., the AC square wave electrical signal, output by the primary conversion subcircuit 12, rectifies the first high-voltage square wave signal, converts it into a first rectified low-voltage DC signal and outputs it; the first end of the step-down subcircuit 112 is connected to the fourth end of the rectifier circuit 111, receives the first rectified low-voltage DC signal output by the rectifier circuit 111, steps down the first rectified low-voltage DC signal, converts it into a low-voltage DC charging signal and outputs it to the first device to be charged, i.e., a battery, to charge the first charging device, i.e., the battery, thereby realizing the charging function of the vehicle-mounted power supply circuit 10 for the first device to be charged in the discharge state.

[0060] Alternatively, when the DCDC conversion circuit works in reverse, for example, when the DCDC conversion circuit charges the electrical load in a discharge state, the second end of the rectifier circuit 111 of the first conversion subcircuit 1 on the secondary side is connected to the second output end of the secondary second winding of the magnetic integrated transformer 13, receives the second high-voltage square wave electrical signal, i.e., the AC square wave electrical signal, output by the second conversion subcircuit 14 on the secondary side, rectifies the second high-voltage square wave electrical signal, converts it into a second rectified low-voltage DC signal and outputs it; the second end of the step-down subcircuit 112 is connected to the third end of the rectifier circuit 111, receives the second rectified low-voltage DC signal output by the rectifier circuit 111, steps down the second rectified low-voltage DC signal, converts it into a low-voltage DC power supply signal and outputs it to the first device to be charged, i.e., the electrical load, to charge the first device to be charged, i.e., the electrical load, thereby realizing the charging function of the on-board power supply circuit 10 for the first device to be charged in a discharge state.

[0061] In some embodiments, Figure 4 As shown, the buck subcircuit 112 includes: a first buck subcircuit and a second buck subcircuit 122, wherein:

[0062] The first end of the first step-down sub-circuit is connected to the fourth end of the rectifier sub-circuit 111, the second end of the first step-down sub-circuit is connected to the third end of the rectifier sub-circuit 111, the third end of the first step-down sub-circuit is connected to the low-voltage negative electrode, and the fourth end of the first step-down sub-circuit is connected to the low-voltage positive electrode; one end of the second step-down sub-circuit 122 is connected to the fifth end of the first step-down sub-circuit, and the other end of the second step-down sub-circuit 122 is connected to the third end of the rectifier sub-circuit 111.

[0063] In some embodiments, Figure 4 As shown, the first step-down sub-circuit includes: a second MOS tube, for example, denoted as Q2 and an inductor, for example, denoted as L, wherein one end of the second MOS tube Q2 is connected to the fourth end of the rectifier circuit 111; a first end of the inductor L is connected to the other end of the second MOS tube Q2, and a second end of the inductor L is connected to the low voltage positive electrode LV+.

[0064] In some embodiments, Figure 4 As shown, the second step-down sub-circuit 122 includes: a third MOS transistor, for example, denoted as Q3 and a first MOS transistor Q1, wherein one end of the third MOS transistor Q3 is connected to the fifth end of the first step-down sub-circuit; one end of the first MOS transistor Q1 is connected to the other end of the third MOS transistor Q3, and the other end of the first MOS transistor Q1 is connected to the third end of the rectifier circuit 111.

[0065] In the embodiment, when the low-voltage positive electrode LV+ and the low-voltage negative electrode LV- of the first conversion sub-circuit 1 on the secondary side are reversely connected due to erroneous operation, the first MOS tube Q1 is in an off state, so that the loop cannot be turned on, thereby preventing the first conversion sub-circuit 1 on the secondary side from malfunctioning, and the first MOS tube Q1 is arranged in series with the third MOS tube Q3 in the second step-down sub-circuit 122, which can reduce the overcurrent flowing through, and prevent the overcurrent capacity and conduction impedance of the MOS tube set in the first step-down sub-circuit from being high due to the large overcurrent, resulting in a higher cost of the MOS.

[0066] In some embodiments, Figure 4 As shown, the step-down sub-circuit 112 further includes: a capacitor, for example, denoted as C, one end of the capacitor C is connected to the second end of the inductor L, and the other end of the capacitor C is connected to the third end of the rectifier circuit 111.

[0067] According to the vehicle power supply circuit 10 of the embodiment of the utility model, the charging function of the vehicle power supply circuit 10 is realized by setting a DCDC conversion circuit to charge the device to be charged, that is, a battery, or to charge the power load in a discharge state, and an anti-reverse connection device is set between the low-voltage positive electrode and the low-voltage negative electrode of the secondary side first conversion sub-circuit 1. When the low-voltage positive electrode and the low-voltage negative electrode are reversely connected due to misoperation, they can be shut down in time, thereby reducing the probability of circuit failure and reducing the requirements for the overcurrent capacity and on-resistance of the MOS tube, thereby reducing the cost of the MOS tube.

[0068] Reference below Figure 7 A vehicle 100 according to an embodiment of the present invention is described.

[0069] like Figure 7 As shown, the vehicle 100 of the embodiment of the utility model includes: the vehicle-mounted power supply circuit 10 as the above embodiment.

[0070] According to the vehicle 100 of the embodiment of the utility model, a DCDC conversion circuit is provided to charge the device to be charged, i.e., a battery, or to charge the power load in a discharge state, so as to realize the charging function of the vehicle power supply circuit 10, and an anti-reverse connection device is provided between the low-voltage positive electrode and the low-voltage negative electrode of the first conversion sub-circuit 1 on the secondary side, so that when the low-voltage positive electrode and the low-voltage negative electrode are reversely connected due to misoperation, the device can be shut down in time, thereby reducing the probability of circuit failure, and reducing the requirements on the overcurrent capacity and on-resistance of the MOS tube, thereby reducing the cost of the MOS tube.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" 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 utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0072] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A vehicle-mounted power supply circuit, characterized in that: include: A DCDC conversion circuit, the DCDC conversion circuit comprises a secondary side first conversion sub-circuit and an anti-reverse connection device, the anti-reverse connection device is arranged between a low-voltage positive electrode and a low-voltage negative electrode of the secondary side first conversion sub-circuit, and the anti-reverse connection device is used to shut down when the low-voltage positive electrode and the low-voltage negative electrode are reversely connected.

2. The vehicle-mounted power supply circuit according to claim 1, characterized in that: The reverse connection protection device includes a first MOS tube.

3. The vehicle-mounted power supply circuit according to claim 1, characterized in that: The DCDC conversion circuit comprises: A PFC conversion sub-circuit, one end of which is connected to the AC charging port; A conversion subcircuit, wherein a first end of the conversion subcircuit is connected to another end of the PFC conversion subcircuit, and another end of the conversion subcircuit is connected to a device to be charged.

4. The vehicle-mounted power supply circuit according to claim 3, characterized in that: The device to be charged includes a first device to be charged, and the conversion subcircuit includes: a primary side conversion sub-circuit, one end of which is connected to the other end of the PFC conversion sub-circuit; A magnetic integrated transformer, wherein the primary winding of the magnetic integrated transformer is connected to the other end of the primary side conversion sub-circuit; The secondary side first conversion subcircuit, one end of the secondary side first conversion subcircuit is connected to the secondary second winding of the magnetic integrated transformer, and the other end of the secondary side first conversion subcircuit is connected to the first device to be charged.

5. The vehicle-mounted power supply circuit according to claim 4, characterized in that: The device to be charged further includes a second device to be charged, and the conversion subcircuit further includes: A secondary side second conversion subcircuit, one end of the secondary side second conversion subcircuit is connected to the secondary first winding of the magnetic integrated transformer, and the other end of the secondary side second conversion subcircuit is connected to the second device to be charged.

6. The vehicle-mounted power supply circuit according to claim 4, characterized in that: The secondary side first conversion sub-circuit comprises: A rectifier circuit, wherein a first end of the rectifier circuit is connected to a first output end of the secondary second winding of the magnetic integrated transformer, and a second end of the rectifier circuit is connected to a second output end of the secondary second winding of the magnetic integrated transformer; A step-down sub-circuit, wherein a first end of the step-down sub-circuit is connected to the fourth end of the rectifier sub-circuit, and a second end of the step-down sub-circuit is connected to the third end of the rectifier sub-circuit.

7. The vehicle-mounted power supply circuit according to claim 6, characterized in that: The step-down sub-circuit comprises: a first step-down sub-circuit, wherein a first end of the first step-down sub-circuit is connected to a fourth end of the rectifier sub-circuit, a second end of the first step-down sub-circuit is connected to a third end of the rectifier sub-circuit, a third end of the first step-down sub-circuit is connected to the low-voltage negative electrode, and a fourth end of the first step-down sub-circuit is connected to the low-voltage positive electrode; A second step-down sub-circuit, wherein one end of the second step-down sub-circuit is connected to the fifth end of the first step-down sub-circuit, and the other end of the second step-down sub-circuit is connected to the third end of the rectifier sub-circuit.

8. The vehicle-mounted power supply circuit according to claim 7, characterized in that: The first step-down sub-circuit comprises: a second MOS transistor, one end of which is connected to the fourth end of the rectifier circuit; An inductor, wherein a first end of the inductor is connected to the other end of the second MOS tube, and a second end of the inductor is connected to the low-voltage positive electrode.

9. The vehicle-mounted power supply circuit according to claim 7, characterized in that: The second step-down sub-circuit comprises: a third MOS tube, one end of which is connected to the fifth end of the first step-down sub-circuit; A first MOS tube, one end of the first MOS tube is connected to the other end of the third MOS tube, and the other end of the first MOS tube is connected to the third end of the rectifier circuit.

10. The vehicle-mounted power supply circuit according to claim 8, characterized in that: The step-down sub-circuit further includes: A capacitor, one end of which is connected to the second end of the inductor, and the other end of which is connected to the third end of the rectifier circuit.

11. A vehicle, characterized in that: include: The vehicle-mounted power supply circuit as described in any one of claims 1 to 10.

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