SINGLE-PHASE FULL BRIDGE BOOST CONVERTER SYSTEMS AND METHODS

• US 20090231893A1
• Filed: 03/12/2008
• Published: 09/17/2009
• Est. Priority Date: 03/12/2008
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Kajouke, Lateef A., Esmaili, Gholamreza
• Granted Patent: US 7,940,539 B2
• Time in Patent Office: Days
• US Class Current: 363/79
• CPC Class Codes: H02M 7/53871 with automatic control of output voltage or current

Abstract

Single-phase full bridge boost converter systems and methods are provided. One system includes a direct-quatrature (D-Q) control system configured to generate a control voltage (v_con) including direct-phase and quadrature-phase voltage components. The system also includes a comparator configured to compare v_con to a carrier waveform voltage, generate switching commands based on the comparison, and transmit the switching commands to a current switch. Another system includes a boost converter including multiple switches coupled to a load and an AC voltage source. The switches are configured to provide charging current to the load in response to receiving switching commands. A D-Q control system configured to receive and delay an i_a value, and issue switching commands based on the i_a and delayed i_a value is also included. A method includes performing a D-Q conversion to generate DC current including direct-phase and quadrature-phase current components, and issuing switching commands based on the current components.

Claims

1. A system for issuing a switching command to a single-phase full boost converter comprising a voltage sensor for detecting a DC voltage (v_dc), a current sensor for detecting an alternating current (i_a), and a switch configured to control the i_a, the system comprising:

a direct-quatrature (D-Q) control system configured to be coupled to the voltage sensor and the current sensor, and further configured to generate a control voltage (v_con) comprising a direct-phase voltage component and a quadrature-phase voltage component; and

a first comparator coupled to the D-Q control system and configured to be coupled to the switch and to a waveform reference voltage (v_tri) source, the first comparator further configured to;

compare v_con to v_tri,

generate the switching command based on the comparison of v_con and v_tri, and

transmit the switching command to the switch.

2. The system of claim 1, wherein the D-Q control system comprises:

a first portion configured to be coupled to the voltage sensor and the current sensor, and further configured to generate the quadrature-phase voltage component based on the v_dc detected by the voltage sensor and the i_a detected the current sensor;

a second portion configured to be coupled to the voltage sensor and the current sensor, and further configured to generate the direct-phase voltage component based on the detected i_a; and

a first adder coupled to the first portion, the second portion and the first comparator, the first adder configured to sum the quadrature-phase voltage component and the direct-phase voltage component to generate the v_con.

3. The system of claim 2, wherein the D-Q control system further comprises a delay function coupled to the first portion and the second portion, and configured to be coupled to the current sensor, the delay function further configured to apply a 90 degree delay to the detected i_a to generate a delay current (i_b).

4. The system of claim 3, wherein the D-Q control system further comprises:

a phase-locked loop (PLL) configured to determine a phase angle (θ

);

a sine function coupled to the PLL, the first portion, and the second portion, the PLL configured to provide a sin θ

value to the first portion and the second portion; and

a cosine function coupled to the PLL, the first portion, and second portion, and configured to provide a cos θ

value to the first portion and the second portion.

5. The system of claim 4, wherein the first portion comprises:

a first multiplier coupled to the cosine function and the delay circuit, the first multiplier further configured to multiply the cos θ

value and the i_b to generate an i_b cos θ

component;

a second multiplier coupled to the sine function and configured to be coupled to the current sensor, the second multiplier configured to multiply the sin θ

value and the detected i_a to generate an i_a sin θ

component; and

a subtractor coupled to the first multiplier and the second multiplier, the subtractor configured to subtract the i_a sin θ

component from the i_b cos θ

component to generate a quadrature-phase current (i_q) value.

6. The system of claim 5, wherein the first portion further comprises:

a second comparator configured to be coupled to a DC reference voltage (v_dc-ref) source and the voltage sensor, the second comparator configured to compare v_dc-ref to v_dc to determine a voltage error;

a first controller coupled to the second comparator and configured to determine a reference quadrature-phase current (i_q-ref) value to offset the voltage error;

a third comparator coupled to the first controller and the subtractor, the third comparator configured to compare the i_q value to the determined i_q-ref value to determine a quadrature-phase current error;

a second controller coupled to the third comparator and configured to determine a quadrature-phase voltage (v_q) value to offset the determined quadrature-phase current error; and

a third multiplier coupled to the second controller, the sine function, and the first adder, the third multiplier configured to multiply the determined v_q value and the sin θ

value to generate the quadrature-phase voltage component.

7. The system of claim 6, wherein the second portion comprises:

a fourth multiplier coupled to the cosine function and configured to be coupled to the current sensor, the fourth multiplier further configured to multiply the cos θ

value and the detected i_a to generate an i_a cos θ

component;

a fifth multiplier coupled to the sine function and the delay circuit, and configured to multiply the sin θ

value and the i_b to generate an i_b sin θ

component; and

a second adder coupled to the fourth multiplier and the fifth multiplier, the second adder configured to sum the i_a cos θ

component to the i_b sin θ

component to generate a direct-phase current (i_d) value.

8. The system of claim 7, wherein the second portion further comprises:

a fourth comparator coupled to the second adder and configured to be coupled to a direct-phase reference current (i_d-ref) source, the third comparator further configured to compare the i_d value to the i_d-ref to determine a direct-phase current error;

a third controller coupled to the fourth comparator and configured to determine a direct-phase voltage (v_d) to offset the determined direct-phase current error; and

a sixth multiplier coupled to the third controller, the cosine function, and the first adder, the sixth multiplier configured to multiply the v_d and the cos θ

value to generate the direct-phase voltage component.

9. The system of claim 8, wherein i_d-ref has a value of zero.

10. A system for charging a load using an AC voltage source, comprising:

a single-phase full bridge boost converter comprising a plurality of switches coupled to the load and the AC voltage source, the plurality of switches configured to provide charging current to the load in response to receiving switching commands; and

a direct-quadrature (D-Q) control system coupled to the single-phase full bridge boost converter, wherein the D-Q control system is configured to;

receive a first AC current (i_a) value from the single-phase full bridge boost converter;

delay the i_a value to generate a second AC current (i_b) value; and

issue the switching commands based on the i_a and i_b values.

11. The system of claim 10, wherein the D-Q control system is further configured to issue the switching commands based on a DC voltage (v_dc) received from the full bridge boost converter.

12. The system of claim 11, wherein the D-Q control system is further configured to:

determine a quadrature-phase current value based on the v_dc, the i_a, and a delay current of the i_a;

determine a quadrature-phase voltage value based on the i_q value;

determine a direct-phase current value based on the i_a and the i_b;

determine a direct-phase voltage value based on the i_d value; and

generate the switching commands based on the determined quadrature-phase voltage value and the determined direct-phase voltage value.

13. A method for charging a load in a single-phase full boost converter including a current switch coupled to the load, alternating current (i_a), and a DC voltage (v_dc), the method comprising the steps of:

performing a direct-quadrature conversion to the i_a to generate a direct current including a direct-phase current (i_d) component and a quadrature-phase current (i_q) component; and

issuing a switching command to the switch based on the i_d component and the i_q component.

14. The method of claim 13, wherein the performing step comprises the steps of:

comparing the v_dc to a DC reference voltage (v_dc-ref) to determine a voltage error;

determining a quadrature-phase reference current (i_q-ref) value to offset the voltage error;

determining an i_q value for the single-phase full boost converter;

comparing the i_q-ref value to the determined i_q value;

determining a quadrature-phase voltage (v_q) value based on the comparison of i_q-ref and i_q; and

multiplying the v_q value by a sine function of a phase angle (sin θ

) to generate a first portion of the switching command.

15. The method of claim 14, wherein the determining the i_q value step comprises the steps of:

determining an i_a value for the single-phase full boost converter;

multiplying the i_a value by the sin θ

to generate an i_a sin θ

value;

delaying the i_a value by 90 degrees to generate a delayed current (i_b) value;

multiplying the i_b value by a cosine function of the phase angle (cos θ

) to generate an i_b cos θ

value; and

subtracting the i_b cos θ

value from the i_a sin θ

value (i_a sin θ

−

i_b cos θ

) to generate the i_q value.

16. The method of claim 15, wherein the performing step further comprises the steps of:

determining a direct-phase current (i_d) value for the single-phase full boost converter;

comparing the determined i_d value to a reference direct-phase current (i_d-ref) value;

determining a direct-phase voltage (v_d) value based on the comparison of the determined i_d value and the i_d-ref value; and

multiplying the v_d value by a cosine function of the phase angle (cos θ

) to generate a second portion of the switching command.

17. The method of claim 16, further comprising the steps of:

summing the first portion and the second portion to generate a voltage value (v_q sin θ

+v_d cos θ

) in a control voltage (v_con);

comparing v_con to a waveform reference voltage (v_tri);

determining the switching command based on the comparison of v_con and v_tri.

18. The method of claim 17, further comprising the step of operating a switch coupled to a current source within the single-phase full boost converter based on the switching command.

19. The method of claim 16, wherein the determining the i_d value step comprises the steps of:

multiplying the i_a value by the cos θ

to generate an i_a cos θ

value;

multiplying the i_b value by the sin θ

to generate an i_b sin θ

value; and

summing the i_a cos θ

value and the i_b sin θ

value (i_a cos θ

+i_b sin θ

) to generate the i_d value.

20. The method of claim 19, wherein the comparing the i_d value to the i_d-ref value comprises the step of comparing the i_d value to a zero value.