Power supply device, power system and vehicle

Abstract

The utility model relates to a power supply device, a power system and a vehicle, the power supply device comprises an inverter circuit, a transformer, a first rectifying circuit and a second rectifying circuit, and the transformer comprises a primary winding, a first secondary winding and a second secondary winding; the primary winding is used for being connected to an initial direct-current power supply through the inverter circuit, the first secondary winding is used for outputting a first target direct-current power supply through the first rectifying circuit, and the first secondary winding and the second secondary winding are jointly used for outputting a second target direct-current power supply through the second rectifying circuit. The added second secondary winding is only a partial winding for realizing the second path of output instead of a complete winding which is completely independent from the first secondary winding, so that the multiplexing of the first secondary winding is realized; compared with the prior art, the size of the required magnetic core is small, the cost of the winding is low, and the integration degree is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy, in particular to a power supply device, a power system and a vehicle. BACKGROUND

[0002] New energy vehicles widely use on-board chargers to charge power batteries after processing high-voltage direct current from power grids, and use direct current converters to supply starting batteries and related low-voltage direct current loads after converting high-voltage direct current from power batteries into low-voltage direct current. With the increasing power demand of low-voltage direct current loads, if the traditional starting battery with a low amplitude is still used, it will result in excessive full-load current and small equivalent load, which will bring great challenges to system control, heat dissipation, etc.

[0003] Therefore, it is necessary to increase an output independent of the starting battery to share part of the high-power demand of the low-voltage direct current load, thereby forming a dual-output power supply device. The direct way in the prior art is to increase a winding in the transformer on the basis of the original output to increase an output.

[0004] The added winding and the original winding are independent of each other, and each independently realizes the output function of the corresponding path, resulting in a large volume of required magnetic core, high cost of winding and low integration. SUMMARY

[0005] The embodiments of the present application provide a power supply device, a power system and a vehicle. A second secondary winding is added on the basis of a first secondary winding. The first secondary winding can output a first target direct current power through a first rectifier circuit. The second secondary winding is used in cooperation with the first secondary winding to output a second target direct current power through a second rectifier circuit. The added second secondary winding is only a partial winding for realizing the second output, rather than a complete winding independent of the first secondary winding. The first secondary winding is reused to at least partially solve the above technical problems.

[0006] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a power supply device is provided, comprising an inverter circuit, a transformer, a first rectifier circuit and a second rectifier circuit, the transformer comprising a primary winding, a first secondary winding and a second secondary winding;

[0007] The primary winding is used to connect an initial direct current power through the inverter circuit. The first secondary winding is used to output a first target direct current power through the first rectifier circuit. The first secondary winding and the second secondary winding are respectively electrically connected with the second rectifier circuit to output a second target direct current power through the second rectifier circuit.

[0008] Optionally, the first secondary winding includes a first sub-winding and a second sub-winding, and the first rectifying circuit includes a first switch element and a second switch element;

[0009] The first end of the first sub-winding is electrically connected to the first access end of the first switch element, the second end of the first sub-winding is electrically connected to the first end of the second sub-winding and is used for being electrically connected to the positive electrode of the first battery, the second end of the second sub-winding is electrically connected to the first access end of the second switch element, and the second access end of the first switch element and the second access end of the second switch element are respectively used for being electrically connected to the negative electrode of the first battery.

[0010] Optionally, the first switch element includes a first MOS tube, and the second switch element includes a second MOS tube;

[0011] The drain of the first MOS tube is electrically connected to the first end of the first sub-winding, the drain of the second MOS tube is electrically connected to the second end of the second sub-winding, and the source of the first MOS tube and the source of the second MOS tube are respectively used for being electrically connected to the negative electrode of the first battery.

[0012] Optionally, the first rectifying circuit further includes a first inductor and a first capacitor;

[0013] The first end of the first inductor is respectively electrically connected to the second end of the first sub-winding and the first end of the second sub-winding, the second end of the first inductor is electrically connected to the first end of the first capacitor and is used for being electrically connected to the positive electrode of the first battery, and the second end of the first capacitor is used for being electrically connected to the negative electrode of the first battery.

[0014] Optionally, the second secondary winding includes a third sub-winding, and the second rectifying circuit includes a third switch element and a fourth switch element;

[0015] The first access end of the third switch element is respectively electrically connected to the first end of the first sub-winding and the first access end of the first switch element, the first end of the third sub-winding is respectively electrically connected to the second end of the second sub-winding and the first access end of the second switch element and is used for being electrically connected to the positive electrode of the second battery, the second end of the third sub-winding is electrically connected to the first access end of the fourth switch element, and the second access end of the third switch element and the second access end of the fourth switch element are respectively used for being electrically connected to the negative electrode of the second battery.

[0016] Optionally, the third switch element includes a third MOS tube, and the fourth switch element includes a fourth MOS tube;

[0017] The drain of the third MOS tube is respectively electrically connected to the first end of the first sub-winding and the first access end of the first switch element, the drain of the fourth MOS tube is electrically connected to the second end of the third sub-winding, and the source of the third MOS tube and the source of the fourth MOS tube are respectively used for being electrically connected to the negative electrode of the second battery.

[0018] Optionally, the second rectifying circuit further comprises a second inductor and a second capacitor;

[0019] The first end of the second inductor is electrically connected with the second end of the second sub-winding and the first end of the third sub-winding respectively, the second end of the second inductor is electrically connected with the first end of the second capacitor and used for being electrically connected with the positive pole of the second battery, and the second end of the second capacitor is used for being electrically connected with the negative pole of the second battery.

[0020] Optionally, the power supply device further comprises a voltage adjusting circuit electrically connected with the output end of the second rectifying circuit;

[0021] The second rectifying circuit outputs the second target direct current power through the voltage adjusting circuit.

[0022] Optionally, the voltage adjusting circuit comprises an energy storage element, a fifth switch element and a sixth switch element;

[0023] The second rectifying circuit is used for outputting the second target direct current power through the energy storage element, the fifth switch element and the sixth switch element;

[0024] The fifth switch element and the sixth switch element are used for controlling the energy storage and the energy release of the energy storage element together.

[0025] Optionally, the energy storage element comprises a third inductor, the fifth switch element comprises a fifth MOS tube, and the sixth switch element comprises a sixth MOS tube;

[0026] The first end of the third inductor is electrically connected with the first end of the second rectifying circuit, the second end of the third inductor is electrically connected with the drain of the fifth MOS tube and the source of the sixth MOS tube respectively, the drain of the sixth MOS tube is used for being electrically connected with the positive pole of the second battery, and the source of the fifth MOS tube is electrically connected with the second end of the second rectifying circuit and used for being electrically connected with the negative pole of the second battery.

[0027] Optionally, the voltage adjusting circuit further comprises a third capacitor;

[0028] The first end of the third capacitor is electrically connected with the drain of the sixth MOS tube and used for being electrically connected with the positive pole of the second battery, and the second end of the third capacitor is electrically connected with the second end of the second rectifying circuit and the source of the fifth MOS tube respectively and used for being electrically connected with the negative pole of the second battery.

[0029] Optionally, the power supply device further comprises an electromagnetic compatibility circuit electrically connected with the input end of the inverter circuit;

[0030] The inverter circuit is connected with the initial direct current power through the electromagnetic compatibility circuit.

[0031] According to the second aspect of the present application, a power system is provided, comprising a power battery, a first battery, a second battery and the power supply device in any of the above embodiments.

[0032] The power battery is electrically connected with the primary winding through an inverter circuit, the first battery is electrically connected with the first secondary winding through a first rectifier circuit, and the second battery is electrically connected with the first secondary winding and the second secondary winding through a second rectifier circuit respectively.

[0033] According to a third aspect of the present application, a vehicle is provided, which comprises the power supply device in any of the above embodiments, or comprises the power system in any of the above embodiments.

[0034] The power supply device in the embodiments of the present application adds the second secondary winding on the basis of the first secondary winding, the first secondary winding can output the first target direct current power through the first rectifier circuit, and the second secondary winding is used in cooperation with the first secondary winding to output the second target direct current power through the second rectifier circuit. The added second secondary winding is only a partial winding for realizing the second output, rather than a complete winding independent of the first secondary winding, and the reuse of the first secondary winding is realized. Compared with the prior art, the volume of the magnetic core required by the present application is smaller, the cost of the winding is lower, and the integration is higher.

[0035] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0037] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0038] Figure 1 is a structural schematic diagram of the power supply device provided in the exemplary embodiments of the present application;

[0039] Figure 2 is a specific circuit implementation schematic diagram of the first rectifier circuit and the second rectifier circuit provided in the exemplary embodiments of the present application;

[0040] Figure 3 is a structural schematic diagram of the power supply device provided in the exemplary embodiments of the present application, which further comprises a voltage adjustment circuit;

[0041] Figure 4 is a specific circuit implementation schematic diagram of the voltage adjustment circuit provided in the exemplary embodiments of the present application;

[0042] Figure 5 is a structural schematic diagram of a power system provided in the exemplary embodiments of the present application, which also includes an electromagnetic compatibility circuit;

[0043] Figure 6 is a structural schematic diagram of a power system provided in the exemplary embodiments of the present application, which also includes an electromagnetic compatibility circuit; DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0045] According to a first aspect of the present application, as shown in Figure 1 a power supply device is provided, which includes an inverter circuit 1, a transformer 2, a first rectifier circuit 3 and a second rectifier circuit 4. The transformer 2 includes a primary winding 21, a first secondary winding 22 and a second secondary winding 23.

[0046] The primary winding 21 is configured to be connected to an initial DC power HV through the inverter circuit 1, the first secondary winding 22 is configured to output a first target DC power LV1 through the first rectifier circuit 3, and the first secondary winding 22 and the second secondary winding 23 are respectively electrically connected to the second rectifier circuit 4 to output a second target DC power LV2 through the second rectifier circuit 4.

[0047] The first rectifier circuit 3 and the second rectifier circuit 4 are both configured to rectify the AC power output by the first secondary winding 22 and / or the second secondary winding 23 to obtain a rectified DC power. The turns ratio of the primary winding 21 to the first secondary winding 22 and the second secondary winding 23 determines the voltage conversion ratio between the primary winding 21 and the secondary windings.

[0048] The first rectifier circuit 3 is configured to rectify only the AC power output by the first secondary winding 22, and the voltage amplitude of the rectified DC power is related to the first secondary winding 22. The second rectifier circuit is configured to rectify both the AC power output by the first secondary winding 22 and the AC power output by the second secondary winding 23, and the voltage amplitude of the rectified DC power is related to both the first secondary winding 22 and the second secondary winding 23. It can be seen that the DC power output by the first rectifier circuit 3 and the second rectifier circuit 4 is different, and two-way output is achieved.

[0049] In the process of realizing the above two-way output, the first secondary winding 22 not only participates in the process of the first-way output, but also participates in the process of the second-way output, that is, the first secondary winding 22 is multiplexed in the process of the two-way output. In this way, when the second-way output needs to be added, only the second secondary winding 23 that plays a supplementary role needs to be added on the basis of the first secondary winding 22, that is, a partial winding is added, and a complete winding completely independent of the first secondary winding 22 does not need to be added.

[0050] The power supply device of the embodiment of the present application adds the second secondary winding on the basis of the first secondary winding, the first secondary winding can output the first target direct current power through the first rectifier circuit, and the second secondary winding is used in cooperation with the first secondary winding to output the second target direct current power through the second rectifier circuit. The added second secondary winding is only a partial winding for realizing the second-way output, rather than a complete winding completely independent of the first secondary winding, and the multiplexing of the first secondary winding is realized. Compared with the prior art, the volume of the magnetic core required by the present application is smaller, the cost of the winding is lower, and the integration is higher.

[0051] As shown in Figure 2 , optionally, the primary winding includes a primary winding sub N1, the first secondary winding includes a first winding sub N2 and a second winding sub N', the first rectifier circuit includes a first switching element and a second switching element, the first switching element includes a first MOS tube V6, and the second switching element includes a second MOS tube V7.

[0052] The first end of the first winding sub N2 is electrically connected with the drain of the first MOS tube V6, the second end of the first winding sub N2 is electrically connected with the first end of the second winding sub N', and is used for being electrically connected with the positive pole of the first battery (such as a 12V battery), the second end of the second winding sub N' is electrically connected with the drain of the second MOS tube V7, and the source of the first MOS tube V6 and the source of the second MOS tube V7 are respectively used for being electrically connected with the negative pole of the first battery. Figure 2

[0053] The first rectifier circuit composed of the first MOS tube V6 and the second MOS tube V7 adopts a full-wave rectification mode.

[0054] ​Specifically, the inverter circuit converts the initial DC power supply HV into a square wave signal with a voltage amplitude of ±HV. This square wave signal is transmitted through electromagnetic induction between the primary winding N1 and the first and second sub-windings N2 and N2'. When the induced electromotive force (EMF) on the secondary side is positive, the first MOSFET V6 is de-conducted while the second MOSFET V7 is turned on. The second sub-winding N2' forms a current loop through the first battery and the second MOSFET V7, thereby charging the first battery. When the induced EMF on the secondary side is negative, the first MOSFET V6 is turned on while the second MOSFET V7 is de-conducted. The first sub-winding N2' forms a current loop through the first MOSFET V6 and the first battery, thereby charging the first battery. The sum of the DC power outputs during these two charging processes can be understood as the first target DC power supply LV1 output by the first rectifier circuit.

[0055] In the above process, the voltage amplitude of the first target DC power supply LV1 output to the first battery depends on the turns ratio of the first sub-winding N2 and the second sub-winding N2' relative to the primary sub-winding N1. For example, taking a 12V battery as an example, the turns ratio of the primary sub-winding N1 to the first sub-winding N2 is HV:12, and the turns ratio of the primary sub-winding N1 to the second sub-winding N2' is HV:12. Thus, when the inverter circuit inputs a square wave signal with a voltage amplitude of ±HV to the primary sub-winding N1, the first sub-winding N2 and the second sub-winding N2' can respectively output square wave signals with voltage amplitudes of ±12V. Under the synchronous rectification control of the first MOSFET V6 and the second MOSFET V7, the first target DC power supply LV1 with a voltage amplitude of 12V can be output to the 12V battery.

[0056] In other embodiments, the first and second switching elements may also be other specific switching devices besides MOSFETs, such as transistors, IGBTs, thyristors, or other mechanical switches. However, it should be noted that the selected switching devices need to have a certain switching speed.

[0057] like Figure 2 As shown, optionally, the first rectifier circuit also includes a first inductor L1 and a first capacitor C1.

[0058] The first end of the first inductor L1 is electrically connected to the second end of the first sub-winding N2 and the first end of the second sub-winding N2', the second end of the first inductor L1 is electrically connected to the first end of the first capacitor C1 and is used for electrical connection with the positive terminal of the first battery, and the second end of the first capacitor C1 is used for electrical connection with the negative terminal of the first battery.

[0059] The first inductor L1 is used for filtering, and the first capacitor C1 is used for voltage regulation, thereby ensuring the stability of the first target DC power supply LV1 output to the first battery.

[0060] like Figure 2 As shown, optionally, the second secondary winding includes a third sub-winding N2”, the second rectifier circuit includes a third switching element and a fourth switching element, the third switching element includes a third MOSFET V5, and the fourth switching element includes a fourth MOSFET V8.

[0061] The drain of the third MOSFET V5 is electrically connected to the first terminal of the first sub-winding N2 and the drain of the first MOSFET V6, respectively. The first terminal of the third sub-winding N2" is electrically connected to the second terminal of the second sub-winding N2' and the drain of the second MOSFET V7, and is also used for connection to the second battery (e.g., Figure 2 The positive terminal of the 24V battery is electrically connected, the second end of the third sub-winding N2” is electrically connected to the drain of the fourth MOSFET V8, and the source of the third MOSFET V5 and the source of the fourth MOSFET V8 are respectively used to electrically connect to the negative terminal of the second battery.

[0062] The second rectifier circuit, consisting of the third MOSFET V5 and the fourth MOSFET V8, adopts full-wave rectification.

[0063] Specifically, the inverter circuit converts the initial DC power supply HV into a square wave signal with a voltage amplitude of ±HV. This square wave signal is transmitted through electromagnetic induction between the primary winding N1 and the first, second, and third windings N2' and N”. When the induced electromotive force (EMF) on the secondary side is positive, the third MOSFET V5 is de-conducted while the fourth MOSFET V8 is turned on. The third winding N2” forms a current loop through the second battery and the fourth MOSFET V8, thus charging the second battery. When the induced EMF on the secondary side is negative, the third MOSFET V5 is turned on while the fourth MOSFET V8 is de-conducted. The first and second windings N2' form a current loop through the third MOSFET V5 and the second battery, thus charging the second battery. The sum of the DC power outputs during these two charging processes can be understood as the second target DC power supply LV2 output by the second rectifier circuit.

[0064] In the above process, the voltage amplitude of the second target DC power supply LV2 output to the second battery depends on the turns ratio of the first sub-winding N2, the second sub-winding N2', and the third sub-winding N” relative to the primary sub-winding N1. For example, taking a 24V battery as an example, the turns ratio of the primary sub-winding N1 to the first sub-winding N2 is HV:12, the turns ratio of the primary sub-winding N1 to the second sub-winding N2' is HV:12, and the turns ratio of the primary sub-winding N1 to the third sub-winding N” is HV:24. Thus, when the inverter circuit inputs a square wave signal with a voltage amplitude of ±HV to the primary winding N1, the first winding N2 and the second winding N2' can output square wave signals with a voltage amplitude of ±12V respectively, and the third winding can output square wave signals with a voltage amplitude of ±24V respectively. Under the synchronous rectification control of the third MOSFET V5 and the fourth MOSFET V8, the second target DC power supply LV2 with a voltage amplitude of 24V can be output to the 24V battery.

[0065] In other embodiments, the third and fourth switching elements may also be other specific switching devices besides MOSFETs, such as transistors, IGBTs, thyristors, or other mechanical switches. However, it should be noted that the selected switching devices need to have a certain switching speed.

[0066] like Figure 2 As shown, optionally, the second rectifier circuit also includes a second inductor L2 and a second capacitor C2.

[0067] The first end of the second inductor L2 is electrically connected to the second end of the second sub-winding N2' and the first end of the third sub-winding N”, respectively. The second end of the second inductor L2 is electrically connected to the first end of the second capacitor C2 and is used for electrical connection with the positive terminal of the second battery. The second end of the second capacitor C2 is used for electrical connection with the negative terminal of the second battery.

[0068] The second inductor L2 is used for filtering, and the second capacitor C2 is used for voltage regulation, thereby ensuring the stability of the second target DC power supply LV2 output to the second battery.

[0069] like Figure 2 As shown, in the initial stage, due to the extremely low energy consumption of the first battery system, the duty cycle of the primary winding is extremely low, resulting in extremely low equivalent voltage and energy input to the second battery system, making it impossible to complete the normal charging of the second battery. Therefore, after detecting an abnormal charging voltage of the second battery, the first MOSFET V6 and the second MOSFET V7 are controlled to extend their conduction time, thereby increasing the conduction duty cycle of the first sub-winding N2 and the second sub-winding N2'. The square wave duty cycle induced by the third sub-winding N2" also increases accordingly, increasing the energy output of the second rectifier circuit, thereby realizing the normal charging function of the second battery.

[0070] As Figure 3 shown, optionally, the power supply device further comprises a voltage adjustment circuit 5 electrically connected with the output end of the second rectifier circuit 4.

[0071] Among them, the second rectifier circuit 4 outputs the second target direct current power LV2 through the voltage adjustment circuit 5.

[0072] Among them, based on the above analysis of the two-way output, it is known that the voltage amplitude of the direct current power output by the first rectifier circuit 3 is determined by the first secondary winding 22, and the voltage amplitude of the direct current power output by the second rectifier circuit 4 is determined by the first secondary winding 22 and the second secondary winding 23, and because the first secondary winding 22 is multiplexed in the process of two-way output, the voltage amplitude output by the first secondary winding 22 and the second secondary winding 23 has a fixed proportional relationship.

[0073] As Figure 2 shown, based on the role of the first sub-winding N2, the second sub-winding N2' and the third sub-winding N2" in the rectification process, the voltage amplitude output by the first sub-winding N2 and the second sub-winding N2' needs to be equal, and the voltage amplitude output by the first sub-winding N2 and the second sub-winding N2' and the voltage amplitude output by the third sub-winding N2" needs to be equal. It can be seen that the voltage amplitude of the direct current power directly output by the first rectifier circuit 3 and the second rectifier circuit 4 has a 1:2 relationship, and when the voltage amplitude required by the second battery and the voltage amplitude required by the first battery do not satisfy the proportional relationship, it will cause the power supply device to be unable to operate normally. Therefore, in this embodiment, in view of this situation, the voltage adjustment circuit 5 is added, and the voltage adjustment circuit 5 can adjust the voltage of the direct current power output by the second rectifier circuit 4 to meet the various amplitude requirements of the second battery.

[0074] As Figure 4 shown, optionally, the voltage adjustment circuit comprises an energy storage element, a fifth switching element and a sixth switching element, the energy storage element comprises a third inductor L3, the fifth switching element comprises a fifth MOS tube V9, and the sixth switching element comprises a sixth MOS tube V10.

[0075] Among them, the first end of the third inductor L3 is electrically connected with the first end of the second rectifier circuit (such as the second end of the second inductor L2), the second end of the third inductor L3 is electrically connected with the drain of the fifth MOS tube V9 and the source of the sixth MOS tube V10 respectively, the drain of the sixth MOS tube V10 is used for electrically connected with the positive electrode of the second battery (such as the battery of 48V), and the source of the fifth MOS tube V9 is electrically connected with the second end of the second rectifier circuit (such as the source of the fourth MOS tube V8) and used for electrically connected with the negative electrode of the second battery.

[0076] The voltage adjustment circuit composed of the third inductor L3, the fifth MOS V9 and the sixth MOS V10 can realize the step-up and step-down purpose between the second rectifier circuit and the second battery.

[0077] Specifically, when the second rectifier circuit has an output, the fifth MOS V9 is controlled to be turned on, and the direct current power output by the second rectifier circuit stores energy in the third inductor L3 and charges the second battery. After the third inductor L3 stores energy, the sixth MOS V10 is controlled to be turned on, the third inductor L3 releases energy, and the second battery is charged.

[0078] In other embodiments, the fifth switch element and the sixth switch element can also use other specific switching devices other than MOS, such as semiconductor switches such as triode, IGBT tube, thyristor, or other mechanical switches, but it needs to be noted that the selected switching device needs to have a certain switching speed. Similarly, the energy storage element can also use other specific energy storage devices other than inductors, such as transformers, capacitors, etc. It needs to be noted that when the switching element and / or the energy storage element are used, the corresponding connection relationship can be different.

[0079] As shown in Figure 4 Optionally, the voltage adjustment circuit further comprises a third capacitor C3.

[0080] The first end of the third capacitor C3 is electrically connected with the drain of the sixth MOS V10 and is used for electrical connection with the positive electrode of the second battery, and the second end of the third capacitor C3 is electrically connected with the second end (such as the source of the fourth MOS V8) of the second rectifier circuit and the source of the fifth MOS V9 and is used for electrical connection with the negative electrode of the second battery.

[0081] The third capacitor C3 is used for voltage stabilization, thereby guaranteeing the stability of the second target direct current power LV2 output to the second battery.

[0082] As shown in Figure 4As shown, the voltage adjustment circuit can also step down, as mentioned above. Specifically, the sixth MOS V10 is controlled to be turned on, and the second battery supplies power to the second rectifier circuit in reverse; the sixth MOS V10 is controlled to be turned off, and only the third inductor L3 supplies power to the second rectifier circuit in reverse, thereby realizing the step-down function. The fourth MOS V8 is controlled to be turned on and the third MOS V5 is controlled to be turned off, and the second battery discharges to the third sub-coil N2' through the step-down circuit, and the first sub-coil N2 and the second sub-coil N2' inductively obtain positive electromotive force. The second MOS V7 is controlled to be turned on and the first MOS V6 is controlled to be turned off, and the second sub-coil N2' charges the first battery through the second MOS V7 and the first inductor L1. The third MOS V5 is controlled to be turned on and the fourth MOS V8 is controlled to be turned off, and the second battery discharges to the second sub-coil N2' through the step-down circuit, and the first sub-coil N2 inductively obtains negative electromotive force. The first MOS V6 is controlled to be turned on and the second MOS V7 is controlled to be turned off, and the first sub-coil N2 and the second sub-coil N2' charge the first battery through the first MOS V6 and the first inductor L1. The switch is controlled to be switched continuously, and stable power supply from the second battery to the first battery can be realized.

[0083] As shown in Figure 5 Optionally, the power supply device further comprises an electromagnetic compatibility circuit 6 electrically connected to the input end of the inverter circuit 1.

[0084] The inverter circuit 1 is connected to the initial DC power HV through the electromagnetic compatibility circuit 6.

[0085] The electromagnetic compatibility circuit 6 is mainly used for surge protection, lightning protection, anti-interference, etc.

[0086] According to the second aspect of the present application, as shown in Figure 6 A power system is provided, comprising a power battery 7, a first battery 8, a second battery 9, and the power supply device 100 in any of the above embodiments.

[0087] The power battery 7 is electrically connected to the primary winding 21 through the inverter circuit 1, the first battery 8 is electrically connected to the first secondary winding 22 through the first rectifier circuit 3, and the second battery 9 is electrically connected to the first secondary winding 22 and the second secondary winding 23 through the second rectifier circuit 4.

[0088] The power system of the embodiment of the present application comprises the power supply device, the second secondary winding is additionally arranged on the basis of the first secondary winding, the first secondary winding can output the first target direct current power through the first rectifier circuit, and the second secondary winding is used in cooperation with the first secondary winding to output the second target direct current power through the second rectifier circuit, the additionally arranged second secondary winding is only a partial winding for realizing the second output instead of a complete winding independent of the first secondary winding, and the reuse of the first secondary winding is realized; compared with the prior art, the volume of the magnetic core required by the present application is smaller, the cost of the winding is lower, and the integration is higher.

[0089] According to a third aspect of the present application, a vehicle is provided, comprising the power supply device in any of the above embodiments, or comprising the power system in any of the above embodiments.

[0090] The power supply device of the vehicle of the embodiment of the present application comprises the second secondary winding additionally arranged on the basis of the first secondary winding, the first secondary winding can output the first target direct current power through the first rectifier circuit, and the second secondary winding is used in cooperation with the first secondary winding to output the second target direct current power through the second rectifier circuit, the additionally arranged second secondary winding is only a partial winding for realizing the second output instead of a complete winding independent of the first secondary winding, and the reuse of the first secondary winding is realized; compared with the prior art, the volume of the magnetic core required by the present application is smaller, the cost of the winding is lower, and the integration is higher.

[0091] The vehicle can be a new energy vehicle such as a pure electric vehicle, a plug-in hybrid electric vehicle or a range extended hybrid electric vehicle, and the present application does not make specific limitation thereon.

[0092] In the description of the present application, the terms "first" and "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0093] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0094] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0095] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. In the embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in an embodiment can be referred to the relevant content of other embodiments. Any brief modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments, without departing from the technical solution content of the present application, still falls within the scope of the technical solution of the present application.

Claims

1. A power supply device characterized by comprising: The inverter circuit, the transformer, the first rectifier circuit and the second rectifier circuit, the transformer comprising a primary winding, a first secondary winding and a second secondary winding; The primary winding is used to access an initial DC power supply through the inverter circuit, the first secondary winding is used to output a first target DC power supply through the first rectifier circuit, and the first secondary winding and the second secondary winding are respectively electrically connected with the second rectifier circuit to output a second target DC power supply through the second rectifier circuit.

2. The power supply device according to claim 1, characterized by The first secondary winding comprises a first sub-winding and a second sub-winding, and the first rectifier circuit comprises a first switching element and a second switching element; The first end of the first sub-winding is electrically connected with the first access end of the first switching element, the second end of the first sub-winding is electrically connected with the first end of the second sub-winding and is used to be electrically connected with the positive electrode of a first battery, the second end of the second sub-winding is electrically connected with the first access end of the second switching element, and the second access end of the first switching element and the second access end of the second switching element are respectively used to be electrically connected with the negative electrode of the first battery.

3. The power supply device according to claim 2, characterized by The first switching element comprises a first MOS tube, and the second switching element comprises a second MOS tube; The drain of the first MOS tube is electrically connected with the first end of the first sub-winding, the drain of the second MOS tube is electrically connected with the second end of the second sub-winding, and the source of the first MOS tube and the source of the second MOS tube are respectively used to be electrically connected with the negative electrode of the first battery.

4. The power supply device according to claim 2, characterized by The first rectifier circuit further comprises a first inductor and a first capacitor; The first end of the first inductor is respectively electrically connected with the second end of the first sub-winding and the first end of the second sub-winding, the second end of the first inductor is electrically connected with the first end of the first capacitor and is used to be electrically connected with the positive electrode of the first battery, and the second end of the first capacitor is used to be electrically connected with the negative electrode of the first battery.

5. The power supply device according to claim 2, wherein The second secondary winding comprises a third sub-winding, and the second rectifier circuit comprises a third switching element and a fourth switching element; The first access end of the third switching element is respectively electrically connected with the first end of the first sub-winding and the first access end of the first switching element, the first end of the third sub-winding is respectively electrically connected with the second end of the second sub-winding and the first access end of the second switching element and is used to be electrically connected with the positive electrode of a second battery, the second end of the third sub-winding is electrically connected with the first access end of the fourth switching element, and the second access end of the third switching element and the second access end of the fourth switching element are respectively used to be electrically connected with the negative electrode of the second battery.

6. The power supply device according to claim 5, wherein The third switching element comprises a third MOS tube, and the fourth switching element comprises a fourth MOS tube; The drain of the third MOS tube is respectively electrically connected with the first end of the first sub-winding and the first access end of the first switching element, the drain of the fourth MOS tube is electrically connected with the second end of the third sub-winding, and the source of the third MOS tube and the source of the fourth MOS tube are respectively used to be electrically connected with the negative electrode of the second battery.

7. The power supply device according to claim 5, wherein The second rectifier circuit further comprises a second inductor and a second capacitor; The first end of the second inductor is electrically connected with the second end of the second sub-winding and the first end of the third sub-winding respectively, the second end of the second inductor is electrically connected with the first end of the second capacitor and used for being electrically connected with the positive pole of the second battery, and the second end of the second capacitor is used for being electrically connected with the negative pole of the second battery.

8. The power supply device according to claim 1, characterized by The power supply device further comprises a voltage adjustment circuit electrically connected with the output end of the second rectifier circuit; The second rectifier circuit outputs the second target direct current power supply through the voltage adjustment circuit.

9. The power supply device according to claim 8, characterized by The voltage adjustment circuit comprises an energy storage element, a fifth switching element and a sixth switching element; The second rectifier circuit is used for outputting the second target direct current power supply through the energy storage element, the fifth switching element and the sixth switching element; The fifth switching element and the sixth switching element are used for controlling the energy storage and energy release of the energy storage element together.

10. The power supply device according to claim 9, wherein The energy storage element comprises a third inductor, the fifth switching element comprises a fifth MOS tube, and the sixth switching element comprises a sixth MOS tube; The first end of the third inductor is electrically connected with the first end of the second rectifier circuit, the second end of the third inductor is electrically connected with the drain of the fifth MOS tube and the source of the sixth MOS tube respectively, the drain of the sixth MOS tube is used for being electrically connected with the positive pole of the second battery, and the source of the fifth MOS tube is electrically connected with the second end of the second rectifier circuit and used for being electrically connected with the negative pole of the second battery.

11. The power supply device according to claim 10, wherein The voltage adjustment circuit further comprises a third capacitor; The first end of the third capacitor is electrically connected with the drain of the sixth MOS tube and used for being electrically connected with the positive pole of the second battery, and the second end of the third capacitor is electrically connected with the second end of the second rectifier circuit and the source of the fifth MOS tube respectively and used for being electrically connected with the negative pole of the second battery.

12. The power supply device according to claim 1, characterized by The power supply device further comprises an electromagnetic compatibility circuit electrically connected with the input end of the inverter circuit; The inverter circuit accesses the initial direct current power supply through the electromagnetic compatibility circuit.

13. A power system characterized by, The power supply device comprises a power battery, a first battery, a second battery and any one of the power supply devices in claims 1 to 12; The power battery is electrically connected with the primary winding through the inverter circuit, the first battery is electrically connected with the first secondary winding through the first rectifier circuit, and the second battery is electrically connected with the first secondary winding and the second secondary winding through the second rectifier circuit respectively.

14. A vehicle characterized by comprising: The power supply device comprises any one of the power supply devices in claims 1 to 12, or the power system in claim 13.

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