Wide-range battery voltage electricity taking circuit

Abstract

The utility model belongs to the technical field of circuits, and discloses a wide-range battery voltage electricity taking circuit, which is characterized in that a port DC + is connected with one end of a fuse F1, the other end of the fuse F1 is connected with one end of a relay K2 and one end of a relay K1, the other end of the relay K1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with one end of a resistor R2, and the other end of the resistor R2 is connected with one end of a resistor R3. And the other end of the resistor R2 is connected with the other end of the relay K2, one end of the capacitor C1 and a pin 1 of the common mode inductor L1. The beneficial effects of the utility model are that the circuit can boost the voltage of a battery from 200-350V to 350V, reduce the voltage of a battery from 450-900V to 450V, and invert the voltage of the battery from 350-450V to 220V AC voltage without boosting and reducing the voltage, thereby satisfying the functions of outdoor and emergency power taking of low-voltage and high-voltage vehicles.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a wide range battery voltage power taking circuit. Background Art

[0002] With the rapid development of new energy electric vehicles, in addition to charging being an essential demand, power extraction has gradually become a new trend. Most power extractors on the market can generally only meet the needs of electric vehicles with a battery voltage of 300-500V. Small electric vehicles with a battery voltage of 200-300V and electric vehicles with a battery voltage of 500-900V cannot use power extractors with a 300-500V input. Producing power extractors with a specific battery voltage of 200-300V or 500-900V cannot bring good economic benefits.

[0003] Therefore, it is necessary to provide a wide range battery voltage power supply circuit to meet the requirements of electric vehicles with battery voltages of 200 to 900V to use the power supply normally, and to meet the outdoor and emergency power supply functions of low-voltage and high-voltage models. Utility Model Content

[0004] The utility model discloses a wide-range battery voltage power taking circuit, belongs to the field of power electronics, and specifically relates to a wide-range battery voltage power taking circuit for electric vehicles, which can effectively solve the technical problems involved in the background technology.

[0005] To achieve the above purpose, the technical solution of the utility model is:

[0006] A wide range battery voltage power supply circuit comprises a port DC+, a port DC-, a port L and a port N; the port DC+ is connected to one end of a fuse F1, the other end of the fuse F1 is connected to one end of a relay K2 and one end of the relay K1, the other end of the relay K1 is connected to one end of a resistor R1, the other end of the resistor R1 is connected to one end of a resistor R2, the other end of the resistor R2 is connected to the other end of the relay K2, one end of a capacitor C1 and a pin 1 of a common mode inductor L1, the other end of the capacitor C1 is connected to a port GND and one end of a capacitor C2, the port DC- is connected to one end of a fuse F2, the other end of the fuse F2 is connected to the other end of the capacitor C2 and a pin 3 of the common mode inductor L1.

[0007] Pin 2 of the common-mode inductor L1 is connected to one end of capacitor C3, one end of capacitor C5, one end of resistor R3, one end of capacitor C7, one end of resistor R5 and the drain of MOS tube Q5. The other end of capacitor C3 is connected to port GND and one end of capacitor C4. The other end of capacitor C5 is connected to one end of capacitor C6, the other end of resistor R3 and one end of resistor R4. The other end of capacitor C7 is connected to one end of capacitor C8, the other end of resistor R5 and one end of resistor R6. MOS tube Q5 The source of the common-mode inductor L1 is connected to one end of the inductor L2 and the negative end of the diode D1, the other end of the inductor L2 is connected to the positive end of the diode D2 and the drain of the MOS tube Q6, the negative end of the diode D2 is connected to one end of the capacitor C9, and the pin 4 of the common-mode inductor L1 is connected to the other end of the capacitor C4, the other end of the capacitor C6, the other end of the resistor R4, the other end of the capacitor C8, the other end of the resistor R6, the positive end of the diode D1, the source of the MOS tube Q6 and the other end of the capacitor C9.

[0008] One end of the capacitor C9 is connected to one end of the resistor R7, the drain of the switch tube Q1 and the drain of the switch tube Q2, the other end of the resistor R7 is connected to one end of the resistor R8, the source of the switch tube Q1 is connected to the drain of the switch tube Q3 and one end of the inductor L3, the other end of the inductor L3 is connected to one end of the capacitor C10, one end of the resistor R9 and the port L, the source of the switch tube Q2 is connected to the drain of the switch tube Q4, the other end of the capacitor C10, the other end of the resistor R9 and the port N, and the other end of the capacitor C9 is connected to the other end of the resistor R8, the source of the switch tube Q3 and the source of the switch tube Q4.

[0009] In order to ensure that electric vehicles with battery voltages of 200 to 900V can use power supply normally, the utility model provides a wide range battery voltage power supply circuit, which can boost the battery voltage of 200 to 350V to 350V, and step down the battery voltage of 450 to 900V to 450V. The battery voltage of 350 to 450V is not boosted or stepped down, and then converted into 220V AC voltage through inversion, thereby meeting the outdoor and emergency power supply functions of low-voltage and high-voltage vehicles.

[0010] As a preferred improvement of the present invention: the resistor R1 and the resistor R2 are cement resistors.

[0011] As a preferred improvement of the present invention: the switch tube Q1, the switch tube Q2, the switch tube Q3 and the switch tube Q4 are IGBTs.

[0012] As a preferred improvement of the present invention: Pin 1 and Pin 2 of the common-mode inductor L1 share a coil, and Pin 3 and Pin 4 of the common-mode inductor L1 share a coil.

[0013] As a preferred improvement of the present utility model: the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are Y capacitors, and the capacitor C5 and the capacitor C6 are X capacitors.

[0014] As a preferred improvement of the utility model: the power supply circuit also includes a controller and a sampling circuit, the sampling circuit is connected to port DC+ and port DC-, and the controller is connected to the sampling circuit, the gate of the MOS tube Q5 and the gate of the MOS tube Q6.

[0015] As a preferred improvement of the present invention: the port DC+ and the port DC- are connected to the power battery of the electric vehicle, and the port L and the port N are connected to the electrical equipment.

[0016] The beneficial effects of the utility model are as follows:

[0017] The circuit is simple and the structure is stable. It can boost the battery voltage of 200-350V to 350V and step down the battery voltage of 450-900V to 450V. The battery voltage of 350-450V is not boosted or stepped down, and then it is inverted into 220V AC voltage to meet the outdoor and emergency power supply functions of low-voltage and high-voltage vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0019] Figure 1 It is a schematic diagram of a wide range battery voltage power supply circuit of the utility model;

[0020] Figure 2 The utility model is used to amplify the power circuit Figure 1 ;

[0021] Figure 3 The utility model is used to amplify the power circuit Figure 2 ;

[0022] Figure 4 This is a schematic diagram of the boost and buck of the utility model Figure 1 ;

[0023] Figure 5This is a schematic diagram of the boost and buck of the utility model Figure 2 ;

[0024] Figure 6 This is a schematic diagram of the boost and buck of the utility model Figure 3 ;

[0025] Figure 7 This is a schematic diagram of the inverter process of the utility model. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be 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.

[0030] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] See also Figure 1As shown, the utility model provides a wide range battery voltage power supply circuit, including a port DC+, a port DC-, a port L and a port N, the port DC+ and the port DC- are connected to the power battery of the electric vehicle, the port L and the port N are connected to the power equipment, the power supply circuit also includes a controller and a sampling circuit, the sampling circuit is connected to the port DC+ and the port DC-, the controller is connected to the sampling circuit, the sampling circuit collects the input voltage and transmits the information to the controller, the controller controls the operation of the circuit according to the input voltage value, and determines whether to increase or decrease, reduce the voltage or not change the voltage.

[0032] See also Figure 2-Figure 3As shown, the port DC+ is connected to one end of the fuse F1, the other end of the fuse F1 is connected to one end of the relay K2 and one end of the relay K1, the other end of the relay K1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the other end of the relay K2, one end of the capacitor C1 and pin 1 of the common-mode inductor L1, the other end of the capacitor C1 is connected to the port GND and one end of the capacitor C2, the port DC- is connected to one end of the fuse F2, and the other end of the fuse F2 is connected to the other end of the capacitor C2 and pin 3 of the common-mode inductor L1. Pin 2 of the common-mode inductor L1 is connected to one end of capacitor C3, one end of capacitor C5, one end of resistor R3, one end of capacitor C7, one end of resistor R5 and the drain of MOS tube Q5. The other end of capacitor C3 is connected to port GND and one end of capacitor C4. The other end of capacitor C5 is connected to one end of capacitor C6, the other end of resistor R3 and one end of resistor R4. The other end of capacitor C7 is connected to one end of capacitor C8, the other end of resistor R5 and one end of resistor R6. MOS tube Q5 The source of the common-mode inductor L1 is connected to one end of the inductor L2 and the negative end of the diode D1, the other end of the inductor L2 is connected to the positive end of the diode D2 and the drain of the MOS tube Q6, the negative end of the diode D2 is connected to one end of the capacitor C9, and the pin 4 of the common-mode inductor L1 is connected to the other end of the capacitor C4, the other end of the capacitor C6, the other end of the resistor R4, the other end of the capacitor C8, the other end of the resistor R6, the positive end of the diode D1, the source of the MOS tube Q6 and the other end of the capacitor C9. One end of the capacitor C9 is connected to one end of the resistor R7, the drain of the switch tube Q1 and the drain of the switch tube Q2, the other end of the resistor R7 is connected to one end of the resistor R8, the source of the switch tube Q1 is connected to the drain of the switch tube Q3 and one end of the inductor L3, the other end of the inductor L3 is connected to one end of the capacitor C10, one end of the resistor R9 and the port L, the source of the switch tube Q2 is connected to the drain of the switch tube Q4, the other end of the capacitor C10, the other end of the resistor R9 and the port N, and the other end of the capacitor C9 is connected to the other end of the resistor R8, the source of the switch tube Q3 and the source of the switch tube Q4. The controller is connected to the gate of the MOS tube Q5 and the gate of the MOS tube Q6, and uses devices such as a single-chip microcomputer, and is also connected to relays K1 and K2, as well as the switch tubes Q1-Q4, to control the operation of the entire circuit.

[0033] As an implementation manner, the resistor R1 and the resistor R2 are cement resistors, the switch tube Q1, the switch tube Q2, the switch tube Q3 and the switch tube Q4 are IGBTs, pin 1 and pin 2 of the common-mode inductor L1 share a coil, pin 3 and pin 4 of the common-mode inductor L1 share a coil, the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are Y capacitors, and the capacitor C5 and the capacitor C6 are X capacitors.

[0034] Specifically, the circuit can be divided into the following four parts:

[0035] Input pre-charging circuit part: It is composed of fuses F1, F2, cement resistors R1, R2, pre-charging relay K1, main relay K2 and input capacitors C7, C8. The power battery current of the electric vehicle passes through the fuse F1, pre-charging relay K1, cement resistors R1, R2, input common-mode inductor L1 and fuse F2 on the DC+ line to charge the input capacitors C7, C8 to a stable voltage. After the pre-charging is completed, the main relay K2 is closed.

[0036] EMI filter circuit part: It consists of Y capacitors C1, C2, C3, C4, X capacitors C5, C6, and common-mode inductor L1. This circuit can suppress common-mode signal and differential-mode signal interference.

[0037] BUCK-BOOST circuit part: It is composed of silicon carbide MOS tubes Q5 and Q6, silicon carbide diodes D1 and D2, buck-boost inductor L2, and bus capacitor C9. This circuit can boost the battery voltage of 200-350V to 350V, and buck the battery voltage of 450-900V to 450V. The battery voltage of 350-450V is not boosted or bucked.

[0038] Inverter circuit part: It consists of 4 IGBT tubes Q1, Q2, Q3, Q4, inverter inductor L3 and inverter capacitor C10. This circuit converts the output voltage of 350~450V (i.e. bus voltage BUS) of the BUCK-BOOST circuit into 220V AC after inversion.

[0039] The working principle of the wide range battery voltage power supply circuit is as follows:

[0040] (1) The power battery current of an electric vehicle with a voltage of 200 to 900 V passes through the fuse F1 on the DC+ line, the pre-charge relay K1, cement resistors R1 and R2, the input common-mode inductor L1 and the fuse F2 to charge the input capacitors C7 and C8 to a stable voltage. After the pre-charge is completed, the main relay K2 is closed.

[0041] (2) The EMI circuit composed of Y capacitors C1, C2, C3, C4, X capacitors C5, C6 and common mode inductor L1 suppresses interference of common mode signals and differential mode signals.

[0042] (3) The BUCK-BOOST circuit is composed of silicon carbide MOS tubes Q5 and Q6, silicon carbide diodes D1 and D2, buck-boost inductor L2, and bus capacitor C9;

[0043] When the battery voltage of the electric vehicle is 200-350V, Q5 remains on, Q6 is turned on or off at a high frequency (low on-time ratio), and the input voltage is boosted to 350V through L2, Q6, D2 and D1. Figure 4 ;

[0044] When the power battery voltage is 450-900V, Q6 remains disconnected, Q5 is turned on or off at a high frequency (high on-time ratio), and the input voltage is stepped down to 450V through Q5, L2, D2 and D1. Figure 5 ;

[0045] When the power battery voltage is 350-450V, the circuit does not step up or down, Q5 remains on, Q6 remains off, and the input voltage passes through Q5, L2, and D2 to charge the bus capacitor C9 to a stable voltage of 350-450V. Figure 6 .

[0046] (4) The inverter circuit is composed of four IGBT tubes Q1, Q2, Q3, Q4, an inverter inductor L3 and an inverter capacitor C10. The left bridge arms Q1 and Q3 are alternately turned on and off at 25KHz, and the right bridge arms Q2 and Q4 are turned on and off at 50Hz, modulating the bus voltage of 350~450V into a 50Hz 220V AC voltage. The switch tube is as follows: Figure 7 .

[0047] This circuit can boost the battery voltage of 200-350V to 350V, and step down the battery voltage of 450-900V to 450V. The battery voltage of 350-450V is not boosted or stepped down, and then it is inverted into 220V AC voltage to meet the outdoor and emergency power supply functions of low-voltage and high-voltage vehicles.

[0048] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and the implementation scheme. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A wide range battery voltage power supply circuit, characterized in that: Includes port DC+, port DC-, port L and port N; The port DC+ is connected to one end of the fuse F1, the other end of the fuse F1 is connected to one end of the relay K2 and one end of the relay K1, the other end of the relay K1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the other end of the relay K2, one end of the capacitor C1 and the pin 1 of the common-mode inductor L1, the other end of the capacitor C1 is connected to the port GND and one end of the capacitor C2, the port DC- is connected to one end of the fuse F2, the other end of the fuse F2 is connected to the other end of the capacitor C2 and the pin 3 of the common-mode inductor L1; Pin 2 of the common-mode inductor L1 is connected to one end of capacitor C3, one end of capacitor C5, one end of resistor R3, one end of capacitor C7, one end of resistor R5 and the drain of MOS tube Q5. The other end of capacitor C3 is connected to port GND and one end of capacitor C4. The other end of capacitor C5 is connected to one end of capacitor C6, the other end of resistor R3 and one end of resistor R4. The other end of capacitor C7 is connected to one end of capacitor C8, the other end of resistor R5 and one end of resistor R6. MOS tube Q5 The source of the common-mode inductor L1 is connected to one end of the inductor L2 and the negative end of the diode D1, the other end of the inductor L2 is connected to the positive end of the diode D2 and the drain of the MOS tube Q6, the negative end of the diode D2 is connected to one end of the capacitor C9, and the pin 4 of the common-mode inductor L1 is connected to the other end of the capacitor C4, the other end of the capacitor C6, the other end of the resistor R4, the other end of the capacitor C8, the other end of the resistor R6, the positive end of the diode D1, the source of the MOS tube Q6 and the other end of the capacitor C9; One end of the capacitor C9 is connected to one end of the resistor R7, the drain of the switch tube Q1 and the drain of the switch tube Q2, the other end of the resistor R7 is connected to one end of the resistor R8, the source of the switch tube Q1 is connected to the drain of the switch tube Q3 and one end of the inductor L3, the other end of the inductor L3 is connected to one end of the capacitor C10, one end of the resistor R9 and the port L, the source of the switch tube Q2 is connected to the drain of the switch tube Q4, the other end of the capacitor C10, the other end of the resistor R9 and the port N, and the other end of the capacitor C9 is connected to the other end of the resistor R8, the source of the switch tube Q3 and the source of the switch tube Q4.

2. A wide range battery voltage power supply circuit according to claim 1, characterized in that: The resistor R1 and the resistor R2 are cement resistors.

3. A wide range battery voltage power supply circuit according to claim 1, characterized in that: The switch tube Q1 , the switch tube Q2 , the switch tube Q3 and the switch tube Q4 are IGBTs.

4. A wide range battery voltage power supply circuit according to claim 1, characterized in that: Pin 1 and pin 2 of the common-mode inductor L1 share a coil, and pin 3 and pin 4 of the common-mode inductor L1 share a coil.

5. A wide range battery voltage power supply circuit according to claim 1, characterized in that: The capacitor C1 , the capacitor C2 , the capacitor C3 , and the capacitor C4 are Y capacitors, and the capacitor C5 and the capacitor C6 are X capacitors.

6. A wide range battery voltage power supply circuit according to claim 1, characterized in that: The power extraction circuit further includes a controller and a sampling circuit. The sampling circuit is connected to the port DC+ and the port DC-. The controller is connected to the sampling circuit, the gate of the MOS transistor Q5 and the gate of the MOS transistor Q6.

7. A wide range battery voltage power supply circuit according to claim 1, characterized in that: The port DC+ and the port DC- are connected to a power battery of an electric vehicle, and the port L and the port N are connected to an electrical device.

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