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CN-122008920-A - Vehicle-mounted charger, control method thereof and vehicle

CN122008920ACN 122008920 ACN122008920 ACN 122008920ACN-122008920-A

Abstract

The vehicle-mounted charger comprises a primary side circuit, a center tap transformer and a secondary side circuit, wherein the primary side circuit comprises a half-bridge unit and an absorption half-bridge unit, two input ends of the half-bridge unit and two input ends of the absorption half-bridge unit are respectively connected with two ends of a primary side winding of the center tap transformer, an output end of the half-bridge unit and an output end of the absorption half-bridge unit are respectively connected with a first bus, two input ends of the secondary side circuit are respectively connected with two ends of a secondary side winding of the center tap transformer, and an output end of the secondary side circuit is used for being connected with a load. According to the scheme, only single-stage conversion from alternating current to direct current is carried out, the primary side of power factor correction and high-voltage alternating current are integrated through single-stage topology, a rectifying bridge arm, a power factor correction inductor and an electrolytic capacitor which are required by power factor correction are removed, the occupied area and the volume of the vehicle-mounted charger are reduced, the cost of the vehicle-mounted charger is reduced, and the electric energy conversion efficiency of the vehicle-mounted charger is improved.

Inventors

  • HE HONGPENG

Assignees

  • 苏州汇川联合动力系统股份有限公司

Dates

Publication Date
20260512
Application Date
20260115

Claims (20)

  1. 1. The vehicle-mounted charger is characterized by comprising a primary side circuit (101), a center tap transformer (102) and a secondary side circuit (103), wherein a first bus of the primary side circuit (101) is connected with the negative electrode of an alternating current power supply, and a second bus is connected with the positive electrode of the alternating current power supply; the primary side circuit (101) comprises: The two input ends of the half-bridge unit (1011) are respectively connected with two ends of a primary winding of the center tap transformer (102), and the output end of the half-bridge unit (1011) is connected with the first bus; -an absorption half-bridge unit (1012), two input ends of the absorption half-bridge unit (1012) being connected to two ends of a primary winding of the center tapped transformer (102), respectively, and an output end of the half-bridge unit (1012) being connected to the first busbar; two input ends of the secondary side circuit (103) are respectively connected with two ends of a secondary side winding of the center tap transformer (102), and an output end of the secondary side circuit (103) is used for being connected with a load.
  2. 2. The vehicle-mounted charger according to claim 1, wherein the half-bridge unit (1011) includes a first bridge arm and a second bridge arm; The first bridge arm is connected between a first input end and an output end of the half-bridge unit (1011); The second leg is connected between a second input and an output of the half-bridge unit (1011).
  3. 3. The vehicle-mounted charger according to claim 2, wherein the first bridge arm comprises a first switching tube (P1) and a second switching tube (P2); The first end of the first switching tube (P1) is connected with the first input end of the half-bridge unit (1011), the second end of the first switching tube (P1) is connected with the second end of the second switching tube (P2), and the first end of the second switching tube (P2) is connected with the output end of the half-bridge unit (1011); the second bridge arm comprises a third switching tube (P3) and a fourth switching tube (P4); the first end of the third switching tube (P3) is connected with the second input end of the half-bridge unit (1011), the second end of the third switching tube (P3) is connected with the second end of the fourth switching tube (P4), and the first end of the fourth switching tube (P4) is connected with the output end of the half-bridge unit (1011).
  4. 4. The vehicle-mounted charger according to claim 2, wherein the absorption half-bridge unit (1012) comprises a third leg and a fourth leg; The third bridge arm is connected between a first input end and an output end of the absorption half-bridge unit (1012); The fourth leg is connected between the second input and the output of the absorption half-bridge unit (1012).
  5. 5. The vehicle-mounted charger according to claim 4, wherein the third bridge arm comprises a fifth switching tube (clamp 1) and a sixth switching tube (clamp 2); a first end of the fifth switching tube (clamp 1) is connected with a first input end of the absorption half-bridge unit (1012), a second end of the fifth switching tube (clamp 1) is connected with a second end of the sixth switching tube (clamp 2), and a first end of the sixth switching tube (clamp 2) is connected with an output end of the absorption half-bridge unit (1012); The fourth bridge arm comprises a seventh switching tube (clamp 3) and an eighth switching tube (clamp 4); the first end of the seventh switching tube (clamp 3) is connected with the second input end of the absorption half-bridge unit (1012), the second end of the seventh switching tube (clamp 3) is connected with the second end of the eighth switching tube (clamp 4), and the first end of the eighth switching tube (clamp 4) is connected with the output end of the absorption half-bridge unit (1012).
  6. 6. The vehicle-mounted charger of claim 4 wherein the third leg comprises a first resistor; the first resistor is connected between a first input and an output of the absorption half-bridge unit (1012); The fourth bridge arm comprises a second resistor; the second resistor is connected between a second input and an output of the absorption half-bridge unit (1012).
  7. 7. The vehicle-mounted charger according to claim 5, wherein the absorption half-bridge unit (1012) further comprises a first absorption capacitor (C1) and a second absorption capacitor (C2); The first absorption capacitor (C1) is connected between the first input end of the absorption half-bridge unit (1012) and the fifth switching tube (clamp 1); The second absorption capacitor (C2) is connected between the second input of the absorption half-bridge unit (1012) and the seventh switching tube (clamp 3).
  8. 8. The vehicle-mounted charger of claim 1 wherein the primary winding of the center-tapped transformer (102) comprises: a first primary winding, wherein the homonymous end of the first primary winding is used as a first end of the primary winding; The homonymous end of the second primary winding is connected with the heteronymous end of the first primary winding and is connected with the center tap, and the heteronymous end of the second primary winding is used as the second end of the primary winding.
  9. 9. The vehicle-mounted charger of claim 8, further comprising a resonant unit connected to the center-tapped transformer (102).
  10. 10. The vehicle-mounted charger according to claim 9, wherein the resonance unit includes a resonance inductance (Lr) connected between a homonymous terminal of the secondary winding and a first input terminal of the secondary circuit (103).
  11. 11. The vehicle-mounted charger according to claim 9, wherein the resonance unit comprises a coupling inductor (Lr 0), a first homonymous terminal of the coupling inductor (Lr 0) is connected to the first terminal of the primary winding, a first heteronymous terminal of the coupling inductor (Lr 0) is connected to the first input terminal of the half-bridge unit (1011), a second homonymous terminal of the coupling inductor (Lr 0) is connected to the second input terminal of the half-bridge unit (1011), and a second heteronymous terminal of the coupling inductor (Lr 0) is connected to the second terminal of the primary winding.
  12. 12. The vehicle-mounted charger of claim 8 further comprising a transformer leakage inductance (Lk), said transformer leakage inductance (Lk) being connected between said center tap and said second bus bar.
  13. 13. The vehicle-mounted charger according to claim 8, further comprising a third capacitor (C3), the third capacitor (C3) being connected between the synonym end of the secondary winding and the second input end of the secondary circuit (103); The third capacitor is a blocking capacitor or a resonant capacitor.
  14. 14. The vehicle-mounted charger according to claim 1, wherein the secondary side circuit (103) comprises a full-bridge unit (1031); A first input end of the full-bridge unit (1031) is connected with a first input end of the secondary side circuit (103), and a second input end of the full-bridge unit (1031) is connected with a second input end of the secondary side circuit (103); The first output end of the full-bridge unit (1031) is connected with the first end of the load, and the second output end of the full-bridge unit (1031) is connected with the second end of the load.
  15. 15. The vehicle-mounted charger according to claim 14, wherein the full-bridge unit (1031) includes a fifth leg and a sixth leg; The first end of the fifth bridge arm is connected with the first input end of the full-bridge unit (1031), the first end of the sixth bridge arm is connected with the second input end of the full-bridge unit (1031), the second end of the fifth bridge arm is connected with the second end of the sixth bridge arm and connected with the first output end of the full-bridge unit (1031), and the third end of the fifth bridge arm is connected with the third end of the sixth bridge arm and connected with the second output end of the full-bridge unit (1031).
  16. 16. The vehicle-mounted charger according to claim 15, wherein the fifth bridge arm comprises a ninth switching tube (S1) and a tenth switching tube (S2); The first end of the ninth switching tube (S1) is connected with the second end of the tenth switching tube (S2) and is connected with the first input end of the full-bridge unit (1031), the second end of the ninth switching tube (S1) is connected with the first output end of the full-bridge unit (1031), and the first end of the tenth switching tube (S2) is connected with the second output end of the full-bridge unit (1031); The sixth bridge arm comprises an eleventh switching tube (S3) and a twelfth switching tube (S4); The first end of the eleventh switching tube (S3) is connected with the second end of the twelfth switching tube (S4) and is connected with the second input end of the full-bridge unit (1031), the second end of the eleventh switching tube (S3) is connected with the first output end of the full-bridge unit (1031), and the first end of the twelfth switching tube (S4) is connected with the second output end of the full-bridge unit (1031).
  17. 17. The vehicle-mounted charger according to claim 3, 5 or 16, wherein each of the switching tubes includes: Si MOS, siC MOS, and at least one of IGBT and FRD.
  18. 18. The vehicle-mounted charger of any one of claims 1-16, further comprising a filter unit connecting the first bus bar and the second bus bar.
  19. 19. The vehicle-mounted charger according to claim 18, wherein the filter unit comprises a filter inductance (Lf) and a filter capacitance (Cf); -said filter inductance (Lf) is connected in said second busbar; The filter capacitor (Cf) is connected between the first and second bus bars.
  20. 20. A control method of a vehicle-mounted charger, wherein the method is used for the vehicle-mounted charger of any one of claims 1 to 19, and the method comprises: and controlling the working state of the half-bridge unit (1011), the working state of the absorption half-bridge unit (1012) and the working state of the secondary side circuit (103) to modulate the power factor and the output power of the vehicle-mounted charger.

Description

Vehicle-mounted charger, control method thereof and vehicle Technical Field The application relates to the field of chargers, in particular to a vehicle-mounted charger, a control method thereof and a vehicle. Background The On-Board Charger (OBC) is a core power electronic component of the new energy automobile, and the On-Board Charger can convert alternating current of an external power supply (power grid) into high-voltage direct current to charge a power battery of the new energy automobile. The conventional vehicle-mounted charger includes two stages of conversion, wherein the former stage conversion is to convert alternating current into direct current, and the latter stage conversion is to convert the direct current provided by the former stage conversion into voltage and current suitable for battery charging. The two-stage conversion of the vehicle-mounted charger not only comprises PFC inductance and bus electrolytic capacitor, but also comprises bridge arms with more tubes, so that the vehicle-mounted charger has large volume, low efficiency and high cost. Disclosure of Invention The vehicle-mounted charger, the control method thereof and the vehicle are used for reducing the volume of the vehicle-mounted charger, improving the efficiency and reducing the cost. In a first aspect, an embodiment of the present application provides a vehicle-mounted charger, including: The primary circuit comprises a primary circuit, a center tap transformer and a secondary circuit, wherein a first bus of the primary circuit is connected with the negative electrode of an alternating current power supply, and a second bus of the primary circuit is connected with the positive electrode of the alternating current power supply; the primary side circuit comprises: The two input ends of the half-bridge unit are respectively connected with two ends of a primary winding of the center tap transformer, and the output end of the half-bridge unit is connected with the first bus; The two input ends of the absorption half-bridge unit are respectively connected with two ends of a primary winding of the center tap transformer, and the output end of the half-bridge unit is connected to the first bus; And two input ends of the secondary side circuit are respectively connected with two ends of a secondary side winding of the center tap transformer, and an output end of the secondary side circuit is used for being connected with a load. Optionally, the half-bridge unit comprises a first bridge arm and a second bridge arm; The first bridge arm is connected between a first input end and an output end of the half-bridge unit; The second bridge arm is connected between the second input end and the output end of the half-bridge unit. Optionally, the first bridge arm comprises a first switching tube and a second switching tube; The first end of the first switching tube is connected with the first input end of the half-bridge unit, the second end of the first switching tube is connected with the second end of the second switching tube, and the first end of the second switching tube is connected with the output end of the half-bridge unit; the second bridge arm comprises a third switching tube and a fourth switching tube; The first end of the third switching tube is connected with the second input end of the half-bridge unit, the second end of the third switching tube is connected with the second end of the fourth switching tube, and the first end of the fourth switching tube is connected with the output end of the half-bridge unit. Optionally, the absorption half-bridge unit comprises a third bridge arm and a fourth bridge arm; The third bridge arm is connected between the first input end and the output end of the absorption half-bridge unit; The fourth bridge arm is connected between the second input end and the output end of the absorption half-bridge unit. Optionally, the third bridge arm comprises a fifth switching tube and a sixth switching tube; the first end of the fifth switching tube is connected with the first input end of the absorption half-bridge unit, the second end of the fifth switching tube is connected with the second end of the sixth switching tube, and the first end of the sixth switching tube is connected with the output end of the absorption half-bridge unit; The fourth bridge arm comprises a seventh switching tube and an eighth switching tube; The first end of the seventh switching tube is connected with the second input end of the absorption half-bridge unit, the second end of the seventh switching tube is connected with the second end of the eighth switching tube, and the first end of the eighth switching tube (clamp 4) is connected with the output end of the absorption half-bridge unit. Optionally, the third bridge arm comprises a first resistor; the first resistor is connected between the first input end and the output end of the absorption half-bridge unit; The fourth bridge arm comprises a second resistor; the sec