SINGLE STAGE INTEGRATED BOOST INVERTER MOTOR DRIVE CIRCUIT

US 20070247123A1
Filed: 04/16/2007
Published: 10/25/2007
Est. Priority Date: 04/19/2006
Status: Active Grant

First Claim

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1. An integrated boost inverter circuit comprising:

at least one inverter stage comprising series connected high- and low-side switches having a common node;

each switch having an anti-parallel connected diode connected across the switch, which diode can be an external diode or an internal body diode of the switch;

at least one inductor connectable in series between a voltage source and the common node of the at least one inverter stage;

a bulk capacitor connected across the at least one inverter stage; and

a load being connectable to the common node of the at least one inverter stage,wherein at every switching cycle, when the low-side switch of the at least one inverter stage turns-ON the respective at least one inductor is charged and when the low-side switch turns-OFF, the current in the respective at least one inductor re-circulates through the anti-parallel connected diode of the high-side switch into the bulk capacitor.

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Abstract

An integrated boost inverter circuit including at least one inverter stage having series connected high- and low-side switches having a common node. Each switch having an anti-parallel connected diode connected across the switch, which diode can be an external diode or an internal body diode of the switch; at least one inductor connectable in series between a voltage source and the node of the at least one inverter stage; a bulk capacitor connected across the at least one inverter stage; and a load being connectable to the node of the at least one inverter stage, wherein at every switching cycle, when the low-side switch of the at least one inverter stage turns-ON the respective at least one inductor is charged and when the low-side switch turns-OFF, the current in the respective at least one inductor re-circulates through the anti-parallel connected diode of the high-side switch into the bulk capacitor.

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14 Claims

1. An integrated boost inverter circuit comprising:
- at least one inverter stage comprising series connected high- and low-side switches having a common node;
  
  each switch having an anti-parallel connected diode connected across the switch, which diode can be an external diode or an internal body diode of the switch;
  
  at least one inductor connectable in series between a voltage source and the common node of the at least one inverter stage;
  
  a bulk capacitor connected across the at least one inverter stage; and
  
  a load being connectable to the common node of the at least one inverter stage,wherein at every switching cycle, when the low-side switch of the at least one inverter stage turns-ON the respective at least one inductor is charged and when the low-side switch turns-OFF, the current in the respective at least one inductor re-circulates through the anti-parallel connected diode of the high-side switch into the bulk capacitor.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- - 2. The circuit of claim 1, wherein three inductors are respectively connected to three inverter stages to form three inverter circuits, the three inverter stages being parallel operated for commutating a three stage motor and sharing the input current drawn by the voltage source.
  - 3. The circuit of claim 2, wherein each of the inverter stages manages about one third of the total input power.
  - 4. The circuit of claim 3, wherein an added stress imposed on the respective high- and low low-side switches controlling the motor phase currents is negligible.
  - 5. The circuit of claim 4, wherein an output voltage is common to the three inverter stages and is calculated in accordance with Vo_z:
    - =max(Vo1_z,Vo2_z,Vo3_z), where $Vo 1_{z}; = \frac{Vin}{1 - d 1_{z}}; Vo 2_{z}; = \frac{Vin}{1 - d 2_{z}}; Vo 3_{z}; = \frac{Vin}{1 - d 3_{z}},$ where d1, d2, and d3 are functions for calculating a modulation type selected from one of the square wave modulation, Space Vector PWM (SVM), and sinusoidal modulation.
  - 6. The circuit of claim 5, wherein three voltages of the selected modulation type are created and 120°
    - phase shifted between each of the three inverter stages to appear at the motor'"'"'s terminals, a constant modulation index (Mi) provides a maximum duty cycle for applying to the common node of each of the three inverter stages.
  - 7. The circuit of claim 6, wherein when the square wave modulation is selected, the at least one inverter stage is PWM modulated such that an average voltage at the common node of the at least one inverter stage is a square wave of a different, selectable amplitude.
  - 8. The circuit of claim 6, wherein when the sinusoidal modulation is selected, the at least one inverter stage is PWM modulated such that an average voltage at the common node of the at least one inverter stage is a sinusoidal voltage.
  - 9. The circuit of claim 6, wherein when in the SVM is selected, the at least one inverter stage is PWM modulated such that an average voltage at the common node of the at least one inverter stage is an amplified sinusoidal voltage plus a small amount of third harmonic.
  - 10. The circuit of claim 9, wherein the modulation is 120°
    - ON pure sinusoid modulation with 20% third harmonic injection used with trapezoidal BEMF permanent magnet motors.
  - 11. The circuit of claim 10, wherein increases in Mi automatically effect increase in voltage across the bulk capacitor and average voltage across the motor and reduce switching losses across the high- and low-side switches
  - 12. The circuit of claim 6, wherein a voltage at the common node of the at least one inverter stage is a product of the DC voltage on the bulk capacitor and the modulation is calculated in accordance with d1_z:
    - =0.5+0.5·
      
      Mi·
      
      sign(sin(ω
      
      m·
      
      t_z)), $d 2_{z}; = 0.5 + 0.5 \cdot Mi \cdot sign (\sin (ω m \cdot t_{z} + \frac{2}{3} \cdot π)),$ $d 3_{z}; = 0.5 + 0.5 \cdot Mi \cdot sign (\sin (ω m \cdot t_{z} + \frac{4}{3} \cdot π))$ for square wave modulation.
  - 13. The circuit of claim 6, wherein a voltage at the common node of the at least one inverter stage is a product of the DC voltage on the bulk capacitor and the modulation is calculated in accordance with d1_z:
    - =0.5+0.5·
      
      Mi·
      
      sin(ω
      
      m·
      
      t_z)·
      
      1.1546+0.19620.5·
      
      Mi·
      
      sin(3·
      
      ω
      
      m·
      
      t_z), $d 2_{z}; = 0.5 + 0.5 \cdot Mi \cdot \sin (ω m \cdot t_{z} + \frac{2}{3} \cdot π) \cdot 1.1546 + 0.19620 .5 \cdot Mi \cdot \sin (3 \cdot ω m \cdot t_{z}), d 3_{z}; = 0.5 + 0.5 \cdot Mi \cdot \sin (ω m \cdot t_{z} + \frac{4}{3} \cdot π) \cdot 1.1546 + 0.19620 .5 \cdot Mi \cdot \sin (3 \cdot ω m \cdot t_{z}),$ for sinusoidal modulation and SVM, where 1.1546 and 0.1962 are coefficients from the equivalent effect performed by SVM, and in case of purely sinusoidal modulation, the coefficient 1.1546 becomes 1 and the coefficient for the third harmonic becomes zero.
  - 14. The circuit of claim 6, wherein a voltage at the common node of the at least one inverter stage is a product of the DC voltage on the bulk capacitor and the modulation is calculated in accordance with d1_z:
    - =0.5+0.5·
      
      Mi·
      
      sin(ω
      
      m·
      
      t_z)·
      
      1+0.2·
      
      0.5·
      
      Mi·
      
      sin(3·
      
      ω
      
      m·
      
      t_z), $d 2_{z}; = 0.5 + 0.5 \cdot Mi \cdot \sin (ω m \cdot t_{z} + \frac{2}{3} \cdot π) \cdot 1 + 0.2 \cdot 0.5 \cdot Mi \cdot \sin (3 \cdot ω m \cdot t_{z}), d 3_{z}; = 0.5 + 0.5 \cdot Mi \cdot \sin (ω m \cdot t_{z} + \frac{4}{3} \cdot π) \cdot 1 + 0.2 \cdot 0.5 \cdot Mi \cdot \sin (3 \cdot ω m \cdot t_{z}),$ for an improved modulation.

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Current Assignee
Infineon Technologies Americas Corp. (Infineon Technologies AG)
Original Assignee
International Rectifier Corporation (Infineon Technologies AG)
Inventors
Bocchiola, Cesare

Granted Patent

US 7,589,986 B2
Time in Patent Office

Days
Field of Search
US Class Current

323/222
CPC Class Codes

H02M 1/0095   Hybrid converter topologies...

H02M 3/1584   with a plurality of power p...

H02M 7/5387   in a bridge configuration

SINGLE STAGE INTEGRATED BOOST INVERTER MOTOR DRIVE CIRCUIT

First Claim

2 Assignments

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Abstract

Citations

14 Claims

Specification

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SINGLE STAGE INTEGRATED BOOST INVERTER MOTOR DRIVE CIRCUIT

First Claim

2 Assignments

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0 Petitions

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Accused Products

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Abstract

Citations

14 Claims

Specification

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Solutions

Use Cases

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