Drive control device
AssigneeRiso Kagaku Corporation
InventorMasao Suzuki
Life of this patent
Estimating the term…
Abstract
A PWM signal generator section for generating a plurality of PWM signals with different phases to be respectively fed to a plurality of loads, and a phase difference setting section for setting phase differences among the PWM signals are provided. The phase difference setting section sets phase differences Δt_shift(n,n+1) calculated based on an effective current Ia(n) flowing to each of the loads, where the number of the loads is N, according to the equations below: Ia_all = ∑ n = 1 N Ia ( n ) t_shift ( n , n + 1 ) = t_pwn × Ia ( n ) / Ia_all where n=1 to N (where N is an integer of two or more, and n+1=1 when n+1>N), and t_pwm is a cycle of the PWM signals.
Claims5
A drive control device for performing drive control of a plurality of loads based on PWM signals, the device comprising:
- a PWM signal generator section for generating the PWM signals with different phases to be respectively fed to the loads;
- and
- a phase difference setting section for setting phase differences among the PWM signals,
- wherein the phase difference setting section sets phase differences Δt_shift(n,n+1) calculated based on an effective current Ia(n) flowing to each of the loads, where the number of the loads is N, according to the equations below:
- Ia_all
- =
- ∑
- n
- =
- 1
- N
-
-
- Ia
-
- (
- n
- )
-
- t_shift
-
- (
- n
- ,
- n
- +
- 1
- )
- =
- t_pwm
- ×
- Ia
-
- (
- n
- )
- /
- Ia_all
- where n=1 to N, N is an integer of two or more, n+1=1 when n+1>N, and t_pwm is a cycle of the PWM signals, and
- wherein the effective current is an effective value (root mean square) of alternate current that flows to a load.
A drive control device for performing drive control of a plurality of loads based on PWM signals, the device comprising:
- a PWM signal generator section for generating the PWM signals with different phases to be respectively fed to the loads;
- and
- a phase difference setting section for setting phase differences among the PWM signals,
- wherein the phase difference setting section sets phase differences Δt_shift(n,n+1) calculated based on an effective voltage Va(n) fed to each of the loads, where the number of the loads is N, according to the equations below:
- Va_all
- =
- ∑
- n
- =
- 1
- N
-
-
- Va
-
- (
- n
- )
-
- t_shift
-
- (
- n
- ,
- n
- +
- 1
- )
- =
- t_pwm
- ×
- Va
-
- (
- n
- )
- /
- Va_all
- where n=1 to N, N is an integer of two or more, n+1=1 when n+1>N, and t_pwm is a cycle of the PWM signals, and
- wherein the effective voltage is an effective value (root mean square) of alternate voltage, which is supplied to a load.
A drive control device for performing drive control of a plurality of loads based on PWM signals, the device comprising:
- a PWM signal generator section for generating the PWM signals with different phases to be respectively fed to the loads;
- and
- a phase difference setting section for setting phase differences among the PWM signals,
- wherein the phase difference setting section sets phase differences Δt_shift(n,n+1) calculated based on an effective electric power Pa(n) consumed by each of the loads, where the number of the loads is N, according to the equations below:
- Pa
-
- (
- n
- )
- =
- Ia
-
- (
- n
- )
- ×
- Va
-
- (
- n
- )
- Pa_all
- =
- ∑
- n
- =
- 1
- N
-
-
- Pa
-
- (
- n
- )
-
- t_shift
-
- (
- n
- ,
- n
- +
- 1
- )
- =
- t_pwm
- ×
- Pa
-
- (
- n
- )
- /
- Pa_all
- where n=1 to N, N is an integer of two or more, n+1=1 when n+1>N, and t_pwm is a cycle of the PWM signals, and
- wherein the effective power is an effective value (root mean square) of alternate power, which is consumed by a load.
A drive control device for performing drive control of a plurality of loads based on PWM signals, the device comprising:
- a PWM signal generator section for generating the PWM signals with different phases to be respectively fed to the loads;
- and
- a phase difference setting section for setting phase differences among the PWM signals,
- wherein the phase difference setting section sets, in a switchable manner, one of sets of phase differences Δt_shift(n,n+1) calculated according to at least two of the equations (1) to (4) below:
- Δt_shift(n,n+1)=t_pwm/N (1)
- where n=1 to N, N is an integer of two or more, n+1=1 when n+1>N, and t_pwm is a cycle of the PWM signals,
- Ia_all
- =
- ∑
- n
- =
- 1
- N
-
-
- Ia
-
- (
- n
- )
-
-
-
- t_shift
-
- (
- n
- ,
- n
- +
- 1
- )
- =
- t_pwm
- ×
- Ia
-
- (
- n
- )
- /
- Ia_all
- (
- 2
- )
- where n=1 to N, N is an integer of two or more, n+1=1 when n+1>N, t_pwm is a cycle of the PWM signals, and Ia(n) is an effective current flowing to each of the N loads,
- Va_all
- =
- ∑
- n
- =
- 1
- N
-
-
- Va
-
- (
- n
- )
-
-
-
- t_shift
-
- (
- n
- ,
- n
- +
- 1
- )
- =
- t_pwm
- ×
- Va
-
- (
- n
- )
- /
- Va_all
- (
- 3
- )
- where n=1 to N, N is an integer of two or more, n+1=1 when n+1>N, t_pwm is a cycle of the PWM signals, and Va(n) is an effective voltage fed to each of the N loads, and
- Pa
-
- (
- n
- )
- =
- Ia
-
- (
- n
- )
- ×
- Va
-
- (
- n
- )
-
-
- Pa_all
- =
- ∑
- n
- =
- 1
- N
-
-
- Pa
-
- (
- n
- )
-
-
-
- t_shift
-
- (
- n
- ,
- n
- +
- 1
- )
- =
- t_pwm
- ×
- Pa
-
- (
- n
- )
- /
- Pa_all
- (
- 4
- )
- where n=1 to N, N is an integer of two or more, n+1=1 when n+1>N, t_pwm is a cycle of the PWM signals, and Pa(n) is an effective electric power consumed by each of the N loads,
- wherein the effective current is an effective value (root mean square) of alternate current that flows to a load,
- wherein the effective voltage is an effective value (root mean square) of alternate voltage, which is supplied to a load, and
- wherein the effective power is an effective value (root mean square) of alternate power, which is consumed by a load.
Dependencies are inferred from the claim text.