Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • 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
  • H02M1/00—Details of apparatus for conversion
  • H02M1/0048—Circuits or arrangements for reducing losses
  • H02M1/0054—Transistor switching losses
  • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • 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
  • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
  • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
  • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
  • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
  • H02M7/4811—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode having auxiliary actively switched resonant commutation circuits connected to intermediate DC voltage or between two push-pull branches
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • 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
  • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
  • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
  • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
  • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
  • H02M7/4815—Resonant converters

Definitions

• the invention relates to a soft switching auxiliary circuit for a half bridge switching resonant inverter which can enable zero voltage transition in the capacitive zone and zero current transition in the inductive zone and which can function within a wide load range.
• An inverter is an electrical converter which converts direct current (DC) to alternative current (AC).
• the AC power generated at the outlet of the inverter can be at any voltage and frequency depending on the transformers, switching and control circuits used.
• inverters made of semiconductors do not have movable parts. It has a wide usage area from low power switching power supplies used in computers to the high- power systems which supply power to electric distribution networks. They are generally used for converting DC power provided from the power sources such as solar panels, wind turbines and batteries to AC power in a controlled way. Briefly, inverters can convert DC power to AC power at the desired voltage, force and frequency by carrying out the reverse function of the AC-DC rectifiers.
• EP3111722 discloses an improved induction cooker with a half-bridge resonant inverter having an adapter coil for heating ferromagnetic as well as non-ferromagnetic cookware.
• the subject matter invention proposes an induction heating cooker heating a ferromagnetic as well as non-ferromagnetic pan, having a half-bridge resonant inverter for converting DC voltage into high-frequency current.
• the inverter has a capacitive element, an induction heating coil, and a switching circuit having two switching devices switched on and off with a duty cycle of 50%.
• the object of the invention is to provide a soft-switched auxiliary circuit for a half-bridge switched resonant inverter that can operate at a switching frequency value above or below the resonant frequency, providing zero voltage crossing in the capacitive region, zero current crossing in the inductive region, and providing power control over a wide range.
• the subject matter invention comprises a soft switching auxiliary circuit for a half bridge switching resonant inverter comprising a DC phase inlet connected via a circuit path and a resonant inverter connected to the DC phase input; a soft-switched auxiliary circuit comprising one or more from a capacitor operating above or below the resonant frequency on the resonant inverter an inductor, a diode and an isolated gate bipolar transistor; a half-bridge switching circuit converting the phase from a direct current input into an alternating current phase output connected half-bridging to the soft- switched auxiliary circuit.
• the soft-switched auxiliary circuit is set to pass zero voltage in the capacitive region and zero current pass in the inductive region.
• a zero current transition or zero voltage transition in accordance with the incoming phase is provided with a resonant inverter.
• Efficiency of use can be achieved, especially in induction cookers, with a resonant inverter that can operate both with zero current passing and zero voltage transition.
• the soft switching auxiliary circuit comprises a parallel resonant auxiliary switch. Therefore, a soft switching formation is provided by the resonance connection of at least two switches from an auxiliary switch formed with the parallel resonance of an isolated-gate bipolar transistor and a diode in a resonant inverter. Moreover, capacitive and inductive circuit elements are connected to the auxiliary circuit over a circuit path in order to provide soft switching.
• the half bridge switching circuit comprises one or more main switches with parallel resonance. Therefore, a half bridge switching formation is provided by the resonance connection of at least two switches from a main switch formed with the parallel resonance of an isolated-gate bipolar transistor, a diode and a capacitor in a resonant inverter. Moreover, it is connected to the auxiliary circuit over the circuit path in a half bridging way in order to provide half bridge switching.
• the soft switching auxiliary circuit is connected to the resonant inverter over a circuit path providing power control in the range of 100W to 10kW.
• a wide range of power control in the resonant inverter can be achieved by the soft switching auxiliary circuit.
• an auxiliary switch comprises a diode and an isolated-gate bipolar transistor.
• the main switch comprises a capacitor, a diode and an isolated-gate bipolar transistor.
• Fig. 1 is the general view of the circuit diagram of the soft switching auxiliary circuit for a half bridge switching resonant inverter of the present invention.
• Fig. 1 shows the circuit diagram in general of the soft switching auxiliary circuit for a half bridge switching resonant inverter of the present invention.
• the soft switching auxiliary circuit for a half bridge switching resonant inverter consists of a resonant inverter (10) circuit structure which for example can be used in an induction heating cooker and serve as an auxiliary circuit (12) for resonant inverters (10), convert the phase (9) from the direct current inlet to the alternative current phase outlet (50) and which is connected to the direct current phase inlet (8) over a circuit path (6).
• the resonant inverter (10) consists of a soft switching auxiliary circuit (12) and a half bridge switching circuit (16) which converts the phase (9) from the direct current inlet to the alternative current phase outlet (50) and which is connected to the soft switching auxiliary circuit (12) in a half bridging way.
• all transistors used in the present invention serve as an isolated-gate bipolar transistor (40, 42, 44, 46).
• the soft switching auxiliary circuit (12) in the resonant inverter (10) has zero voltage transition in the capacitive zone and zero current transition in the inductive zone.
• the soft switching auxiliary circuit (12) is formed by the connection of an auxiliary switch (13), an inductor (28), an auxiliary circuit upper capacitor (20) and an auxiliary circuit lower capacitor (22) in the circuit path (6) so as to function above or below the resonance frequency on the resonant inverter (10).
• the auxiliary switch (13) consists of an auxiliary switching transistor (40) having a parallel resonance connection and an auxiliary switching diode (30) having a parallel resonance connection to the auxiliary switch (13) such that the electricity transmission direction will be from anode to cathode.
• the auxiliary switch (13) is connected over the circuit path (6) at the node point where the capacitors (20, 22) are connected to each other for providing an electric flux transmission therebetween.
• the negative end of the inductor (28) is connected in an electric flux providing way over the circuit path (6).
• the half bridge switching circuit (16) is connected over the circuit path in a half bridging way.
• the half bridge switching circuit (16) is formed by the connection of an upper main switch (17) and a lower main switch (18) in the circuit path (6).
• the upper main switch (17) consists of an upper main switching transistor (44), an upper main switching diode (36) and an upper main switching capacitor (26) which are all in a parallel resonance connection.
• the circuit is completed by the connection over the circuit path of positive end of the inductor (28) at the node point where the switches (17, 18) are connected to each other for providing an electric flux therebetween.
• the present invention provides the following advantages:
• the new resonant inverter (10) can provide a wide power control range, it will cause the input voltage (8) range to increase.
• the soft switching cell can also be used with an AC-AC series- resonant half bridge inverter (10).
• the auxiliary switch (12) conducts in a way that provides zero current switching and the inductor (28) tries to take the load current from the diode (32) by entering into resonance with the auxiliary circuit upper capacitor (20) and the auxiliary circuit lower capacitor (22).
• Phase (9) coming from the direct current input (8); auxiliary circuit upper capacitor (20), auxiliary circuit lower capacitor (22), inductor (28), first auxiliary switching transistor (40), second auxiliary switching diode (32), upper main switching capacitor (24) and lower main switching capacitor (26) and its output (50) is provided in transmission.
• the first auxiliary switching transistor charges the parasitic capacitor (26) of the lower main switch (18) and the parasitic capacitor (26) of the upper main switch (17) with the remaining energy (with the help of its source) before the circuit starts to work it starts to discharge its capacitor (24).
• the output (50) is provided in the cutoff with the transistor (44). In both of these modes of operation, this operation ends when the diode (34) of the upper switch turns on.
• This mode of operation consists of output phase (50), sub-main switching diode (36), second auxiliary switching transistor (42), first auxiliary switching diode (30), inductor (28) and capacitors (20, 22).
• the output phase (50), sub-main switching diode (36), sub-main switching transistor (46), second auxiliary switching transistor (42), first auxiliary switching diode (30), inductor (28) and capacitors (20, 22) is also available.
• this mode of operation ends when the diode (34) of the upper switch turns on.
• the energy in the inductor (28) and the capacitors (20, 22) provides free circulation.
• the transmission signal of the subkey 46 has to be given.
• the upper switch (44) is turned on with the zero voltage transition technique under these operating conditions.
• Mode of operation is provided through the output phase (50), sub-main switching transistor (46), second auxiliary switching transistor (42), first auxiliary switching diode (30), inductor (28) and capacitors (20, 22).
• the upper switch (44) assumes the load current over time.
• Inductor (28) and capacitors (20, 22) cause the current of the inductor (28) to zero by resonance. This mode of operation ends when the inductor 28 current reaches zero.
• This mode of operation provides conduction from the output phase (50) to the sub-main switching transistor (46). It also provides conduction from the sub-main switching diode (36) to the output (50).
• This mode of operation is the normal operating range of the resonant inverter (10) in the capacitive region. In these operating modes, the load current changes direction and the diode (34) of the upper switch turns on. In addition, the transmission signal of the sub-switch (46) has to be interrupted.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Inverter Devices (AREA)

Applications Claiming Priority (1)

Publications (1)

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Family Applications (1)

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• 2021
  • 2021-06-15 WO PCT/TR2021/050607 patent/WO2022265590A1/en active Application Filing
  • 2021-06-15 EP EP21946204.1A patent/EP4356509A1/de active Pending

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