# US 8,787,053 B2 · Close control of electric power converters > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,053 B2 - Document ID: US8787053B2 - Status: Granted - Kind: B2 - Application number: 12/066,101 - Filed: 2006-08-30 - Published: 2008-12-18 - Granted: 2014-07-22 - Earliest claimed: 2005-09-09 - Assignees: Thales - Applicants: Philippe Thomas; Jean-Michel Jarrousse; Eric Laboure - Inventors: Philippe Thomas; Jean-Michel Jarrousse; Eric Laboure - Web page: https://patentgrep.com/patent/US8787053B2 ## CPC - H03K 17/04106: {in field-effect transistor switches (H03K17/0412, H03K17/0416 take precedence)} - H02M 1/08: Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters - H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) ## Abstract A close control of electric power converters includes a diode D1 in parallel with a switch I1; a diode D2 in parallel with a switch I2; a transformer (T1). The switches (I1, I2) are controlled, cyclically repeating the following stages: at a time T0 the switch I1 is switched on; at a time T1 the switch I1 is switched off; the switch I2 is switched on before the current passing through the diode D2 reaches zero; at a time T3 the switch I2 is switched off; and at a time T4, when the diode D1 becomes conductive, the first stage is returned to. In particular, the close control of electric power converters relates to electrically isolated electric power supplies working at high frequency with high efficiency and a high level of integration. ## Claims ### Claim 1 A close control comprising: a control voltage (VCde) to at least one electric power converter, a continuous input voltage (Ve) between a point A and a point B, a first diode in parallel with a first switch, an anode of the first diode being connected to point B, a cathode of the said diode being connected to a point E; a second diode in parallel with a second switch, an anode of the second diode being connected to point B, a cathode of the said second diode being connected to a point F; a transformer comprising a first primary coil connected between point A and a point G, a second primary coil connected between point A and the point F, and a secondary coil, said transformer providing a voltage between a point H and a point D, wherein a number of turns of the first primary coil is equal to the number of turns of the second primary coil, wherein the point E is connected to the point G by a first capacitor; a second capacitor connected between point H and a point I, a third capacitor connected between said point I and point C, a third diode connected between point I and a point J, the anode of the third diode being connected to point I, the cathode of said third diode being connected to said point J, a resistor connected between point J and point C, a fourth diode connected between point J and point D, the anode of the fourth diode being connected to the point D, the cathode of the fourth diode being connected to the point J, point E and point G being electrically connected to one another, as well as point H and a point C, the first and second switches being controlled according to a cyclic sequence comprising the following stages: at a time T0 the first switch is switched on; at a time T1 the first switch is switched off; the second switch is switched on before the current passing through the second diode reaches zero; at a time T3 the second switch is switched off; and at a time T4, when the first diode becomes conductive, the first stage is returned to. ### Claim 2 (depends on 1) The close control as claimed in claim 1, wherein the point H is connected to point C by a second capacitor. ### Claim 3 (depends on 1) The close control as claimed in claim 1, wherein the point H is connected to point C by a second capacitor. ### Claim 4 (depends on 3) The close control as claimed in claim 3, wherein a third diode is connected between the point C and the point D, the anode of the third diode being connected to point D, the cathode of the third diode being connected to point C. ### Claim 5 (depends on 3) The close control as claimed in claim 3, further comprising a first Zener diode and a second Zener diode, the cathode of said first Zener diode being connected to the point C its anode being connected to the anode of said second Zener diode, the cathode of said second Zener diode being connected to the point D. ### Claim 6 A close control comprising: a control voltage (VCde) to at least one electric power converter, a continuous input voltage (Ve) between a point A and a point B, a first diode in parallel with a first switch, an anode of the first diode being connected to point B, a cathode of the said diode being connected to a point E; a second diode in parallel with a second switch, an anode of the second diode being connected to point B, a cathode of the said second diode being connected to a point F; a transformer comprising a first primary coil connected between point A and a point G, a second primary coil connected between point A and the point F, and a secondary coil, said transformer providing a voltage between a point H and a point D, wherein a number of turns of the first primary coil is equal to the number of turns of the second primary coil, wherein the point E is connected to the point G by a first capacitor, and the point H is connected to point C by a second capacitor; and a first Zener diode and a second Zener diode, the cathode of said first Zener diode being connected to the point C its anode being connected to the anode of said second Zener diode, the cathode of said second Zener diode being connected to the point D, wherein point E and point G being electrically connected to one another, as well as point H and a point C, the first and second switches being controlled according to a cyclic sequence comprising the following stages: at a time T0 the first switch is switched on; at a time T1 the first switch is switched off; the second switch is switched on before the current passing through the second diode reaches zero; at a time T3 the second switch is switched off; and at a time T4, when the first diode becomes conductive, the first stage is returned to.