Patent EP0441459A1 successfully refreshed from Google Patents.
EP0441459A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Pulse-width modulation drive circuit
Assignee: Pioneer Corp
•
Filing: 1986-07-02
•
Granted: —
•
Expires: 2006-07-02
Abstract
Abstract A triangular wave generator circuit has a first constant-current source and a second constant-current source connected in series with the first constant-current source to supply twice the amount of current. A charge-storing means is connected between a common junction of the first and second constant-current sources and a reference potential point. A comparator circuit monitors an output level of the charge-storing means, and a control means activates the second constant current source in response to an output of the comparator circuit. An output signal of the charge-storing means is produced as a triangular signal.
Inventors
- 👤 Yoshihiko Pioneer Electronic Corp. Watanabe
- 👤 Tsuneyoshi Pioneer Electronic Corp. Nagashita
- 👤 Susumu Pioneer Electronic Corp. Niinuma
- 👤 Isamu Pioneer Electronic Corp. Nomura
- 👤 Kimito Pioneer Electronic Corp. Kobayahi
- 👤 Hiroyuki Pioneer Electronic Corp. Abe
- 👤 Takayuki Pioneer Electronic Corp. Iijima
- 👤 Kazuto Pioneer Electronic Corp. Shimokawa
- 👤 Akira Pioneer Electronic Corp. Haeno
- 👤 Yoshio Pioneer Electronic Corp. Aoyagi
- 👤 Toshiyuki Pioneer Electronic Corp. Kimura
- 👤 Akio Pioneer Electronic Corp. Namiki
- 👤 Isao Pioneer Electronic Corp. Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 07:59
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; H02P7/03; H02P7/04; H03; H03F; H03F2200/00; H03F2200/33
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
96 words
A triangular wave generator circuit comprising: a first constant-current source, a second constant-current source connected in series with said first constant-current source and supplying twice the amount of current as said first constant-current source, charge-storing means connected between a common junction of said first and second constant-current sources and a reference potential point, a comparator circuit for monitoring an output level of said charge-storing means, and control means for activating said second constant-current source in response to an output of said comparator circuit, an output signal of said charge-storing means being produced as a triangular signal.
Claim 2
Dependent Claim
140 words
In a pulse-width-modulation drive circuit operated from a supply voltage, said drive circuit producing a pulse signal having a pulse width dependent on a signal level of a drive signal and driving a load by switching a current through said load on and off in response to said pulse signal, the improvement wherein said drive circuit comprises: a triangular wave generator circuit for generating two triangular signals having substantially equal peak values and which are opposite to each other in phase, and a first comparator circuit receiving said two triangular signals of opposite phases as upper and lower reference inputs, respectively, and receiving said drive signal as a comparison input, a circuit reference level of said triangular wave generator circuit and a d.c. bias level of said drive signal being set to values determined by division of said supply voltage.
Claim 3
Dependent Claim
115 words
The device circuit according to claim 1, wherein said triangular wave generator circuit comprises a constant-current source, a second constant-current source connected in series with said first constant-current source and which supplies twice the amount of current as said first constant-current source, charge-storing means connected between a common junction of said first and second constant-current sources and a reference potential point, a second comparator circuit for monitoring an output level of said charge-storing means, and control means for selectively activating and deactivating said second constant-current source in response to an output of said comparator circuit, a comparison reference level of said second comparator circuit serving as a circuit reference level of said triangular wave generator.
Claim 4
Dependent Claim
187 words
In a pulse-width-modulation drive circuit for use with a motor which includes pulse generating means for generating a pulse signal having a pulse width dependent on a signal level of a drive signal, said motor being driven by switching a current through said motor on and off in response to said pulse signal, the improvement wherein said pulse generating means comprises; triangular wave generating means for generating two triangular signals which have substantially equal peak values and which are opposite to each other in phase, a first comparator circuit comprising pair of comparators receiving said triangular signals of opposite phases on their noninverting inputs and said drive signal shifted from a center level of each triangular signal by a predetermined positive level on their inverting inputs, and a second comparator circuit comprising a pair of comparators receiving said triangular signals of opposite phases on their inverting inputs and said drive signal shifted from a center level of each triangular signal by a predetermined negative level on their noninverting inputs, said drive circuit producing said pulse signal in response to outputs of said first and second comparator circuits.
Claim 5
Dependent Claim
336 words
In a pulse-width modulation drive circuit which includes a first pair of transistors connected in series with a load between a power supply and ground and each of which is actuated to supply said load with a drive current in a forward direction, and a second pair of transistors connected in series with said load between said power supply and ground and each of which is actuated to supply said load with a drive current in a reverse direction, a two of said first and second pairs of transistors which are on a power supply side being npn transistors, and said load being driven by switching a current through said load on and off in response to a pulse signal having a pulse width which is dependent on a signal level of said drive signal, the improvement wherein said pulse-width modulation drive circuit further comprises: triangular wave generating means for generating two triangular signals which have substantially equal peak values and which are opposite to each other in phase, a comparator circuit receiving said two triangular signals of opposite phases as upper and lower reference inputs, respectively, and said drive signal as a comparison input, means for producing in response to an output from said comparator first and second output pulse signals corresponding to two directions in which said load is to be driven, polarity determining means for determining a polarity of said drive signal with respect to a signal reference level, and first and second unidirectional elements for absorbing reverse electromotive force, one of said unidirectional elements being connected between one terminal of said load and ground and the other being connected between the other terminal of said load and ground, said two of said first and second pairs of transistors which are on said power supply side being driven by said first and second pulse signals, and a two of said first and second pairs of transistors which are on a ground side being driven by a decision output from said polarity determining means.
Claim 6
Dependent Claim
17 words
The drive circuit according to claim 5, wherein said first and second unidirectional elements are Schottky diodes.
References Cited (Backward Citations)
US3743911A
Cited
DE2729407A1
Cited
US4234835A
Cited
FR2431218A1
Cited
US4422023A
Cited
US4450392A
Cited
AT374062B
Cited
US4514666A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.