EP0548749A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Electronic circuit for direct-current feed to electrical loads, particularly storage batteries for electric vehicles
Assignee: Fiat Auto SpA
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Filing: 1992-12-15
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Granted: —
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Expires: 2012-12-15
Abstract
Abstract An electronic circuit for the direct-current feed of electrical loads, particularly storage batteries for electric vehicles, comprising a diode bridge (P1) connected via a first diode (D1) to the primary winding of a transformer (T1) having its secondary winding connected via a second diode (D3) to an external load (13) in parallel with a filter capacitor (C3), in which the circuit comprises a PWM (12), to the output of which there are connected the gate electrodes of a first transistor (M1) and a second transistor (M2), the two transistors being connected to the diode bridge and to the primary winding of the transformer.
Inventors
- 👤 Roberto Guerzoni
- 👤 Piergiorgio Varrone
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 02:31
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/02; H02J2207/00; H02J2207/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
178 words
An electronic circuit (11) for the direct-current feed of electrical loads, particularly storage batteries for electric vehicles, comprising a diode bridge (P1) connected via a first diode (D1) to the primary winding of a transformer (T1) having its secondary winding connected via a second diode (D3) to an external load (13) in parallel with a filter capacitor (C3), characterised in that said circuit comprises a PWM (12), to the output of which there are connected the gate electrodes of a first transistor (M1) and a second transistor (M2), the drain electrode and source electrode of said first transistor being connected to said diode bridge and to said primary winding of said transformer respectively, the drain electrode of said second transistor being connected, in series with said first diode, to said diode bridge, the source electrode of said first transistor and the source electrode of said second transistor being connected together via a third diode (D2), and the drain electrode of said first transistor and the source electrode of said second transistor being connected together via a capacitor (C2).
Claim 2
Dependent Claim
178 words
An electronic circuit (11) for the direct-current feed of electrical loads, particularly storage batteries for electric vehicles, comprising a diode bridge (P1) connected via a first diode (D1) to the primary winding of a transformer (T1) having its secondary winding connected via a second diode (D3) to an external load (13) in parallel with a filter capacitor (C3), characterised in that said circuit comprises a PWM (12), to the output of which there are connected the gate electrodes of a first transistor (M1) and a second transistor (M2), the drain electrode and source electrode of said first transistor being connected to said diode bridge and to said primary winding of said transformer respectively, the drain electrode of said second transistor being connected, in series with said first diode, to said diode bridge, the source electrode of said first transistor and the source electrode of said second transistor being connected together via a third diode (D2), and the drain electrode of said first transistor and the source electrode of said second transistor being connected together via a capacitor (C2).
Claim 3
Dependent Claim
132 words
An electronic circuit as claimed in claim 1, characterised in that the input of said PWM (12) is connected to the output of a first differential integrator (19), a first input of said first differential integrator is connected to the output of an ammeter (20) connected in series with said primary winding of said transformer (T1), a second input of said first differential integrator is connected to the output of a multiplier circuit (18), a first input of said multiplier circuit is connected to said diode bridge (P1), and a second input of said multiplier circuit is connected to the output of a second differential integrator (15) with two inputs connected respectively to a voltmeter (14) connected in parallel with said external load (13), and to an external reference voltage generator (16).
Claim 4
Dependent Claim
66 words
An electronic circuit as claimed in claim 2, characterised in that said first input of said multiplier circuit (18) is connected to said diode bridge (P1) via a second multiplier circuit (17) with two inputs connected respectively to a resistive voltage divider connected to said diode bridge, and to a second capacitor (C4) connected to the power feed of the control circuit via a resistor (R3).
Claim 5
Dependent Claim
30 words
An electronic circuit as claimed in claim 2, characterised in that the time constant of said second differential integrator (15) is much greater than the half-period of the mains supply.
Claim 6
Dependent Claim
26 words
An electronic circuit as claimed in claim 1, characterised in that a capacitor (C1) is connected in parallel with the input of said diode bridge (P1).
Claim 7
Dependent Claim
23 words
An electronic circuit as claimed in claim 1, characterised in that said first transistor (M1) and said second transistor (M2) are MOSFET transistors.
Claim 8
Dependent Claim
24 words
An electronic circuit as claimed in claim 1, characterised in that said first transistor (M1) and said second transistor (M2) are bipolar junction transistors.
Claim 9
Dependent Claim
39 words
An electronic circuit as claimed in claim 6, wherein, as the current circulating through the primary of (T1) is trapezoidal, the capacitor (C1) is of low value to compensate the small current undulation on the sinusoidal, at chopper frequency.
Claim 10
Dependent Claim
45 words
An electronic circuit as claimed in claim 9, wherein the low value of the capacitor (C1) allows a power factor greater than 0.9 to be achieved even at very low absorbed power (the power factor including the phase displacement in addition to the form factor).
Claim 11
Dependent Claim
31 words
An electronic circuit as claimed in claim 1, which, by means of the capacitor (C2), allows complete recovery of the energy returned to the primary by the dispersed flux of (T1).
Claim 12
Dependent Claim
25 words
An electronic circuit as claimed in claim 11, wherein the capacitor (C2) also forms the snubber circuit for (M1), via (D2), conceptually of "non-dissipative" type.
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CA1271519A
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