Over-voltage protection device of generator and method for enhancing over-voltage protection function

Patent metadata

Field	Value
Publication number	US-10742020-B2
Application number	US-201715839357-A
Country	US
Kind code	B2
Filing date	Dec 12, 2017
Priority date	Oct 17, 2017
Publication date	Aug 11, 2020
Grant date	Aug 11, 2020

Abstract

A method for enhancing an over-voltage protection by an over-voltage protection device for a generator is provided. The device includes a high voltage excitation off (HEO) circuit lowering an over-voltage level by an over-voltage lockout control value and a voltage-dependent Ki-Kp (VoKiKp) circuit 30 decreasing an over-voltage generation time by a voltage difference value of a battery voltage. A generator setting voltage is provided to operate the over-voltage and the voltage difference value of the generator 1 . The over-voltage level is lowered and the over-voltage generation time is minimized, thereby enhancing the over-voltage protection of the regulator of the generator.

First claim

What is claimed is:

1. An over-voltage protection device of a generator, comprising:
a high voltage excitation off (HEO) circuit configured to operate an over-voltage generated in the generator; and
a voltage-dependent Ki-Kp (VoKiKp) circuit,
wherein the HEO circuit configured to decrease an over-voltage level by an over-voltage lockout control value, and the VoKiKp circuit configured to decrease an over-voltage generation time by a voltage difference value.

2. The over-voltage protection device of claim 1 , wherein the over-voltage lockout control value is a selected over-voltage lockout setting value.

3. The over-voltage protection device of claim 2 , wherein the over-voltage lockout setting value adjusts instantaneous generation to 0% by 0% EXC_duty by excitation off.

4. The over-voltage protection device of claim 1 , wherein the voltage difference value is a difference between a battery voltage and a generator setting voltage.

5. The over-voltage protection device of claim 4 , wherein the voltage difference value is reflected to electrical load sensitivity representing a change in the generator setting voltage with respect to a time to decrease the over-voltage generation time.

6. The over-voltage protection device of claim 5 , wherein the electrical load sensitivity is divided into an insensitive state and a sensitive state, and the insensitive state and the sensitive state are divided into four stages.

7. The over-voltage protection device of claim 1 , wherein the HEO circuit and the VoKiKp circuit have an analog to digital converter (AC/DC) component configured to receive a battery voltage, a parameter set (PARA_SET) component configured to receive F_Para which is a KiKp control factor, a proportional-integral (PI) component configured to receive a generator setting voltage and the battery voltage, a pulse width modulation (PWM component configured to generate PWM, and an excitation (EXC) component configured to generate an output voltage as an EXC_duty value as common elements, and the HEO circuit is connected to the PWM component, and the VoKiKp circuit is connected to the PARA_SET component.

8. The over-voltage protection device of claim 1 , wherein the HEO circuit and the VoKiKp circuit are operated by an over-protection controller, and the over-protection controller is configured to detect the over-voltage level of the over-voltage to operate the HEO circuit, and detect the voltage difference value to operate the VoKiKp circuit.

9. The over-voltage protection device of claim 8 , wherein the over-protection controller is associated with an HEO map and a VoKiKp map, and each of the HEO map and the VoKiKp map indicates an over-voltage lockout setting value applied to the over-voltage lockout control value and a change in the generator setting voltage with respect to a time to apply a bit value to electrical load sensitivity applied to the voltage difference value.

10. A method for enhancing an over-voltage protection function, comprising:
detecting, by an over-protection controller, over-voltage information at the time of release of electrical load after an operation of electrical load of a generator;
performing, by the over-protection controller, an over-voltage level lowering operation of a high voltage excitation off (HEO) circuit using an over-voltage lockout control value; and
performing, by the over-protection controller, an over-voltage generation time minimization operation of a voltage-dependent Ki-Kp (VoKiKp) circuit using a voltage difference value of a battery voltage and a generator setting voltage,
wherein the over-voltage level lowering operation and the over-voltage generation time minimization operation are maintained until the over-voltage is resolved.

11. The method of claim 10 , wherein the performing of the over-voltage level lowering control includes:
determining, by the over-protection controller, whether an over-voltage level of the over-voltage reaches an HEO setting value;
selecting, by the over-protection controller, a non-voltage memory (NVM)-parameter indicating a change in a generator setting value with respect to a time as HEO NVM-RPARA_SEL according to the over-voltage level;
turning, by the over-protection controller, excitation off by the HEO NVM-RPARA_SEL;
stopping, by the over-protection controller, instantaneous generation of the generator by an EXC_duty value of 0% by the excitation off; and
maintaining, by the over-protection controller, the EXC_duty value to be 0% until the over-voltage level is decreased below the HEO setting value.

12. The method of claim 11 , wherein the NVM-parameter is divided into n setting voltage values to be a bit value and selected as the HEO NVM-RPARA_SEL.

13. The method of claim 10 , wherein the performing of the over-voltage generation time minimization control includes:
determining, by the over-protection controller, whether the voltage difference value coincides with a setting voltage difference value;
detecting, by the over-protection controller, a current generation sensitivity index as the NVM-parameter indicating a change in the generator setting voltage with respect to a time when the voltage difference value and the setting voltage difference value coincides with each other;
selecting, by the over-protection controller, the NVM-parameter as VoKiKp NVM-RPARA_SEL based on the voltage difference value;
converting, by the over-protection controller, the current generation sensitivity index into a changed generation sensitivity index by the VoKiKp NVM-RPARA_SEL;
decreasing, by the over-protection controller, an over-voltage exposure time by the changed generation sensitivity index; and
maintaining, by the over-protection controller, the changed generation sensitivity index until the voltage difference value does not coincide with the setting voltage difference value.

14. The method of claim 13 , wherein the determination of whether the voltage difference value and the setting voltage difference value are equal to each other is based on idle RPM of the generator.

15. The method of claim 13 , wherein the NVM-parameter is divided into n setting voltage difference values to be a bit value and selected as the VoKiKp NVM-RPARA_SEL, n being an integer of 1 or greater.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Choi Nak-Young

Classifications

• H02P9/102

  for limiting effects of transients · CPC title

• H02P9/006 Primary

  Means for protecting the generator by using control (control effected upon generator excitation circuit to reduce harmful effects of overloads or transients H02P9/10) · CPC title

• H02P29/0241

  the fault being an overvoltage · CPC title

• H02H7/065 Primary

  against excitation faults · CPC title

• H02P9/04

  Control effected upon non-electric prime mover and dependent upon electric output value of the generator · CPC title