EP0218288A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
MOS power device usable both as an N-chanel MOS transistor and as a P-channel MOS transistor
Assignee: STMicroelectronics SRL
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Filing: 1986-09-16
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Granted: —
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Expires: 2006-09-16
Abstract
Abstract An N-channel power switch (Q11) is controllable through two inputs (6, 7) by typical control signals for N-channel and P-channel MOS transistors. In the first case the control signal is brought back with unchanged polarity on the gate of the power switch (Q11) which consequently operates in the peculiar manner of an N-channel device. In the second case the control signal charges a capacitor (C1) which reproduces on the gate of the power switch (Q11) the same operating condition, causing it to operate again as an N-channel device although with P-type control.
Inventors
- 👤 Gianpietro Bellinvia
- 👤 Giuseppe Faini
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 08:11
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/687; H03K17/693
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
153 words
MOS power device characterized in that it comprises an N-channel power switch (Q11) with drain and source connected respectively to a positive supply lead (8) and to a negative supply lead (9), two inverters (11, 12) in cascade assigned to the gate control of said power switch (Q11) and two inputs for said inverters a first input (6) being designed for a first control signal with positive voltage in relation to said negative lead (9) and the second input (7) being designed for a second control signal with negative voltage in relation to said positive lead (8) and there being provided a capacitor (C1) placed in parallel with said first input (6) and switching means (Q1, Q2, Q3, Q4) placed between said second input (7) and said capacitor (C1) to allow said second control signal to cause charging of said condenser (C1) at a positive voltage in relation to said negative lead (9).
Claim 2
Dependent Claim
153 words
MOS power device characterized in that it comprises an N-channel power switch (Q11) with drain and source connected respectively to a positive supply lead (8) and to a negative supply lead (9), two inverters (11, 12) in cascade assigned to the gate control of said power switch (Q11) and two inputs for said inverters a first input (6) being designed for a first control signal with positive voltage in relation to said negative lead (9) and the second input (7) being designed for a second control signal with negative voltage in relation to said positive lead (8) and there being provided a capacitor (C1) placed in parallel with said first input (6) and switching means (Q1, Q2, Q3, Q4) placed between said second input (7) and said capacitor (C1) to allow said second control signal to cause charging of said condenser (C1) at a positive voltage in relation to said negative lead (9).
Claim 3
Dependent Claim
18 words
Device in accordance with claim 1 characterized in that said inverters (11, 12) are accomplished with CMOS technology.
Claim 4
Dependent Claim
45 words
Device in accordance with claim 2 characterized in that said inverters (11, 12) are supplied with reduced voltage in relation to that supplied to said power switch (Q11) said reduced voltage being supplied by an external capacitor (CX) placed between said supply leads (8, 9).
Claim 5
Dependent Claim
35 words
Device in accordance with claim 3 characterized in that it comprises means of capacitive coupling (C2) associated with said inverters (11, I2) to allow control thereof by signals having voltage lower than said reduced voltage.
Claim 6
Dependent Claim
53 words
Device in accordance with claim 1 characterized in that said switching means (Q1, Q2, Q3, Q4) comprise first MOS switches (Q1, Q4) driven by said second control signal to cause charging of said capacitor (C1) and second MOS switches (Q2, Q3) subsequently driven by said signal to cause discharge of said capacitor (C2).
Claim 7
Dependent Claim
55 words
6 Device in accordance with claim 5 characterized in that said first switches (Q1, Q2) comprise a first and a second MOS switch element (Q1, Q4) in source follower connection, the first switch element (Q1) being controlled by said second control signal and said second switch element (Q4) being designed to charge said capacitor (C1).
Claim 8
Dependent Claim
39 words
Device in accordance with claim 5 characterized in that said second switches (Q1, Q2) comprise a third switch element (Q2) controlled by said second control signal and a fourth switch element (Q3) designed for discharge of said capacitor (C1).
References Cited (Backward Citations)
No citation records indexed.
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