1. A switching power supply operating in a quasi-resonant mode to filter switching harmonic noise, said switching power supply comprising:
a) an LCL tank having a resonance period Ttank defined by a switching inductor, a switching capacitor and an output inductor;
b) a switching circuit comprising a control input, and a switching output connected in series with said switching inductor;
c) a switching circuit regulation loop for turning on said switching circuit for an on-time tON, starting at a time determined by a state of regulation of said switching power supply;
d) a switching capacitor current sensor for triggering said switching circuit to turn off for an off-time tOFF at an end of said resonance period Ttank;
whereby said output inductor continues discharging during said off-time tOFF in said quasi-resonant mode.
2. The switching power supply of claim 1, wherein said switching capacitor current sensor triggers said switching circuit to turn off when said switching capacitor current reaches zero after said resonance period Ttank.
3. The switching power supply of claim 1, wherein said switching circuit comprises a pair of complementary switches for controlling said on-time tON and said off-time tOFF.
4. The switching power supply of claim 1, further comprising an inductor current sensor in said switching circuit regulation loop for monitoring a switching inductor current, said state of regulation of said switching power supply being determined by a predetermined level of said switching inductor current.
5. The switching power supply of claim 4, further comprising a comparator for comparing said switching inductor current with a set current iSET corresponding to said predetermined level.
6. The switching power supply of claim 1, further comprising an output voltage sensor in said switching circuit regulation loop for monitoring an output voltage of said switching power supply, said state of regulation of said switching power supply being determined by a predetermined level of said output voltage.
7. The switching power supply of claim 1, further comprising a linear driver connected with said switching power supply by a combining network.
8. The switching power supply of claim 7, wherein said combining network comprises a combining node for summing an output of said linear driver with an output of said switching power supply.
9. The switching power supply of claim 7, wherein said combining network comprises a driver feedback loop for said linear driver.
10. The switching power supply of claim 9, further comprising a capacitor is in series with an output of said driver.
11. The switching power supply of claim 1, wherein said switching capacitor current sensor comprises a secondary sense capacitor connected in parallel with said switching capacitor, said switching capacitor current being measured in said secondary sense capacitor.
12. A method for filtering switching harmonic noise in a switching power supply operating in a quasi-resonant mode, said method comprising:
a) providing an LCL tank having a resonance period Ttank defined by a switching inductor, a switching capacitor and an output inductor;
b) providing a switching circuit having a control input and a switching output;
c) connecting said switching output in series with said switching inductor;
d) providing a switching circuit regulation loop for turning on said switching circuit for an on-time tON, starting at a time determined by a state of regulation of said switching power supply;
e) determining an end of said resonance period Ttank with a switching capacitor current sensor;
f) turning off said switching circuit for an off-time tOFF at said end of said resonance period Ttank;
whereby said output inductor continues discharging during said off-time tOFF in said quasi-resonant mode.
13. The method of claim 12, wherein said switching capacitor current sensor triggers said switching circuit to turn off when said switching capacitor current reaches zero after said resonance period Ttank.
14. The method of claim 12, wherein said on-time tON and said off-time tOFF are controlled by a pair of complementary switched belonging to said switching circuit.
15. The method of claim 12, wherein said state of regulation of said switching power supply is determined by a predetermined level of a switching inductor current, said method further comprising:
a) monitoring said switching inductor current with an inductor current sensor; and
b) turning on said switching circuit when said switching inductor current drops below said predetermined level.
16. The method of claim 12, wherein said state of regulation of said switching power supply is determined by an output voltage of said switching power supply, said method further comprising placing an output voltage sensor in said switching circuit regulation loop for monitoring said output voltage.
17. The method of claim 12, further comprising connecting a linear driver with said switching power supply by a combining network.
18. The method claim 17, further comprising summing an output of said linear driver with an output of said switching power supply.
19. The method of claim 18, further comprising providing said linear driver with a driver feedback loop.
20. The method of claim 19, further comprising connecting a capacitor in series with an output of said driver.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An on-vehicle rotary electric machine, comprising:
a rotary shaft driven to rotate, the shaft having a longitudinal direction defining an axial direction, radii defining a radial direction, and a circumference defining a circumferential direction;
a pole core secured on the rotary shaft;
a plurality of magnetic poles formed as parts of the pole core, the magnetic poles being located at intervals in the circumferential direction and passing magnetic flux between two mutually-adjacent of the magnetic poles;
a plurality of permanent magnets each intervening between the two mutually-adjacent magnetic poles, each magnet being magnetized to reduce leakage of the magnetic flux to be passed; and
a plurality of holding members each holding each permanent magnet between two mutually-adjacent magnetic poles, each holding member being secured on the two mutually-adjacent magnetic poles and hang a first plate portion enclosing a radially outer surface of the permanent magnet and two second plate portions enclosing side surfaces of the permanent magnet, the side surfaces each facing the circumferential direction, and the two second plate portions being rigidly coupled to the first plate portion and being lower in rigidity than the first plate portion.
2. The on-vehicle rotary electric machine according to claim 1, wherein the machine is an alternating-current generator mounted on a vehicle, the rotary shaft is driven by an internal combustion engine mounted on the generator, and the pole core is included in a rotor facing a stator with a gap therebetween.
3. The on-vehicle rotary electric machine according to claim 1, wherein the first plate portion and the second plate portions are rigidly coupled to have a substantially horseshoe-shaped end when viewed in the axial direction.
4. The on-vehicle rotary electric machine according to claim 1, wherein the magnetic poles are a plurality of tapered pieces through which magnetic flux passes, the plurality of tapered pieces protrude from the pole core in the anal direction.
5. The on-vehicle rotary electric machine according to claim 1, wherein the magnetic poles are a plurality of unguiform pieces through which magnetic flux passes, the plurality of unguiform pieces protrude from the pole core in the axial direction.
6. The on-vehicle rotary electric machine according to claim 5, wherein a thermosetting resin is filled in a gap formed between an outer surface of each of the second plate portions of the holding member and each side surface of each of the mutually-adjacent unguiform pieces, the side surface touching the outer surface of each of the second plate portions.
7. The on-vehicle rotary electric machine according to claim 6, wherein the gap is formed to increase as the gap goes down radially inward.
8. The on-vehicle rotary electric machine according to claim 6, wherein a magnetic field coil is loaded to the pole core and the thermosetting resin is the same in material type as a resin material to be impregnated and fixed to protect the magnetic coil.
9. The on-vehicle rotary electric machine according to claim 1, wherein the two second plate portions each have an opening formed therethrough in the circumferential direction, whereby the opening weakens each of the second plate portions in the rigidity than the first plate portion.
10. The on-vehicle rotary electric machine according to claim 1, wherein the two second plate portions are tinner than the first plate portion.
11. The on-vehicle rotary electric machine according to claim 1, wherein the first plate portion and the second plate portions are rigidly coupled to have a substantially horseshoe-shaped end when viewed in the axial direction and ends of the second plate portions are bent to partly enclose a radially inner surface of the permanent magnet.
12. The on-vehicle rotary electric machine according to claim 1, wherein the holding member is made of a non-magnetic material.
13. The on-vehicle rotary electric machine according to claim 5, wherein the two second plate portions each have an opening formed therethrough in the circumferential direction, whereby the opening weakens each of the second plate portions in the rigidity than the first plate portion.
14. The on-vehicle rotary electric machine according to claim 13, wherein the opening is one in number.
15. The on-vehicle rotary electric machine according to claim 13, wherein the opening is two or more in number.
16. The on-vehicle rotary electric machine according to claim 13, wherein a thermosetting resin is filled in a gap formed between an outer surface of each of the second plate portions of the holding member and each side surface of each of the mutually-adjacent unguiform pieces, the side surface touching the outer surface of each of the second plate portions.
17. An on-vehicle rotary electric machine, comprising:
a rotary shaft driven to rotate, the shaft having a longitudinal direction defining an axial direction, radii defining a radial direction, and a circumference defining a circumferential direction;
a pole core secured on the rotary shaft;
a plurality of magnetic poles formed as parts of the pole core, the magnetic poles being located at intervals in the circumferential direction and passing magnetic flux between two mutually-adjacent of the magnetic poles;
a plurality of permanent magnets each intervening between the two mutually-adjacent magnetic poles, each magnet being magnetized to reduce leakage of the magnetic flux to be passed; and
a plurality of holding members each holding each permanent magnet between two mutually-adjacent magnetic poles, each holding member being secured on the two mutually-adjacent magnetic poles and having a first plate portion enclosing a radially outer surface of the permanent magnet and two second plate portions enclosing side surfaces of the permanent magnet, the side surfaces each facing the circumferential direction, the two second plate portions being rigidly coupled to the first plate portion and being higher in elasticity than the first plate portion.
18. The on-vehicle rotary electric machine according to claim 17, wherein the two second plate portions each have an opening formed therethrough in the circumferential direction, whereby the opening increases each of the second plate portions in the elasticity than the first plate portion.
19. The on-vehicle rotary electric machine according to claim 18, wherein a thermosetting resin is filled in a gap formed between an outer surface of each of the second plate portions of the holding member and each side surface of each of the mutually-adjacent unguiform pieces, the side surface touching the outer surface of each of the second plate portions.
20. A method of manufacturing a rotary electric machine, comprising steps of:
forming a layer on a magnetic field coil to be loaded to a pole core included in a rotor by impregnating a first thermosetting resin to the magnetic field coil;
filling a gap with a second thermosetting resin, the gap formed between an outer surface of a holding member supporting a permanent magnet and a surface of each of mutually-adjacent unguiform magnetic poles, the permanent magnet being located between the mutually-adjacent unguiform magnetic poles; and
heating both the first and second thermosetting resins at the same time.