Driving control device and method for power converting system

• US 8,080,986 B2
• Filed: 08/26/2009
• Issued: 12/20/2011
• Est. Priority Date: 08/26/2009
• Status: Active Grant

• Current Assignee: National Taipei University Of Technology
• Original Assignee: National Taipei University Of Technology
• Inventors: Lai, Yen-Shin, Chang, Ye-Then
• Primary Examiner(s): Riley, Shawn
• Application Number:
  US12/547,563
• Publication Number:
  US 20110050187A1
• Time in Patent Office: 846 Days
• Field of Search: 323/224, 323/283, 323/284, 323/285
• US Class Current: 323/285
• CPC Class Codes: H02M 1/0009 Devices or circuits for detecting current in a converter
• CPC Class Codes: H02M 3/1588 comprising at least one synchronous rectifier element H02M3/1582, H02M3/1584 take precedence
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A driving control device and method for power converting system includes power converting circuit and driving control device. The driving control device has an analog/digital convertor, a measuring device, and a control module. The driving control method is the analog/digital convertor receives a inductor current and the parameters of the inductor current from the measuring device, measures the slope parameter of the inductor current according the parameters from Equation 1 and Equation 2, then calculates a duty cycle parameter from the slope parameter of the inductor current and use the duty cycle parameter to generate pulse control signal to perform driving control.

Claims

1. A driving control device for power converting system interfaced with a power converting circuit, comprising

an analog/digital convertor which converts analog output voltage and inductor current of an inductor into digital output voltage and inductor current parameters;

a measuring unit, interfaced with the analog/digital convertor, to collect data of inductor current parameters, duty cycle of switching units, sampling pulse signal and calculate slope parameters of the inductor current of the inductor; and

a control module, interfaced with a driving unit, the measuring unit and the analog/digital convertor, containing a controller and a modulator, to calculate the duty cycle parameter from the slope parameters of the inductor current and generate a pulse control signal to operate open or close of the switching units through the driving unit.

2. The driving control device for power converting system as claimed in claim 1, wherein the power converting circuit includes the driving unit, two switching units operated by the driving unit, the inductor coupled with one switching unit, a capacitor coupled with the other switching unit, and a current detector to detect inductor current on the inductor.

3. The driving control device for power converting system as claimed in claim 1, wherein the power converting circuit can be a DC to DC, AC to DC, or DC to AC power converting circuit.

4. The driving control device for power converting system as claimed in claim 1, wherein the control module can use trailing edge modulation, leading edge modulation, triangle modulation, or single switching period dual sampling modulation to generate the pulse control signal.

5. A driving control method for a power converting system whose steps comprise:

1) detecting inductor current of a power converting circuit by an analog/digital convertor;

2) collecting inductor current parameters and uses Equations with the parameters by a measuring unit to calculate slope parameters for the inductor current of an inductor;

3) using the slope parameters of the inductor current to calculate a duty cycle parameter by a control module and using it to generate a pulse control signal to perform driving control.

6. The driving control method for power converting system as claimed in claim 5, wherein the measuring unit collects parameters of the inductor current including:

1) initial inductor current i_L,1 measuring at start of the pulse control signal sampling period T[n];

2) final inductor current i_L,2 measuring at end of the pulse control signal sampling period T[n];

3) sampling inductor current i_L,x measuring at a given time T_x[n] during the pulse control signal sampling period T[n].

7. The driving control method for power converting system as claimed in claim 6, wherein the Equations include Equation 1 and Equation 2 defined as:

8. The driving control method for power converting system as claimed in claim 7, wherein the Equation 1 and Equation 2 for calculating the slope parameters for the inductor current will be different according to modulation types.

9. The driving control method for power converting system as claimed in claim 8, wherein the modulation type can be trailing edge modulation, leading edge modulation, triangle modulation, or single switching period dual sampling modulation.