IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0548290
(1983-11-03)
|
우선권정보 |
JP-0085638 (1979-07-05); JP-0085639 (1979-07-05); JP-0085640 (1979-07-05) |
발명자
/ 주소 |
- Tazima, Yoshihisa
- Morishima, Masayuki
- Okumura, Hiroshi
- Kasahara, Shin-ichi
|
출원인 / 주소 |
- Sanyo Electric Co., Ltd., Tokyo Sanyo Electric Co., Ltd.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
15 인용 특허 :
5 |
초록
▼
An induction heating coil and a self-excited inverter are connected to a ripple voltage source. The self-excited inverter comprises a transistor as a switching element and the transistor is rendered conductive responsive to a drive voltage applied for each cycle of the ripple voltage source, whereby
An induction heating coil and a self-excited inverter are connected to a ripple voltage source. The self-excited inverter comprises a transistor as a switching element and the transistor is rendered conductive responsive to a drive voltage applied for each cycle of the ripple voltage source, whereby the self-excited inverter is started at each cycle of the ripple voltage source. The self-excited inverter stops the oscillation when the voltage of the ripple voltage source becomes lower than a predetermined value. During the non-oscillation period of the intermittent oscillation, the oscillation output of the self-excited inverter is detected. If and when the oscillation output is detected at that time, the oscillation of the inverter is stopped. Furthermore, the pulses of the attenuating oscillation of the self-excited inverter during the oscillation rest period are counted. If and when the count value of the counter is smaller than a predetermined value, the oscillation of the self-excited inverter is started, whereas if and when the count value of the counter exceeds the predetermined value, the oscillation stop state is continued.
대표청구항
▼
1. An induction heating cooking apparatus comprising: low frequency voltage source power supply means for supplying a low frequency ripple voltage for electric power, intermittent high frequency oscillating circuit means being supplied with said electric power causing intermittent high frequency
1. An induction heating cooking apparatus comprising: low frequency voltage source power supply means for supplying a low frequency ripple voltage for electric power, intermittent high frequency oscillating circuit means being supplied with said electric power causing intermittent high frequency oscillation at predetermined intervals, said high frequency oscillation being caused during an oscillation period and being stopped during a non-oscillation period, induction heating coil means for receiving a high frequency current from said intermittent high frequency oscillating means for generating a high frequency alternating magnetic field for induction heating a load by said alternating magnetic field, oscillation detecting means for detecting the output of said intermittent high frequency oscillating means during a period corresponding to said non-oscillation period, oscillation stopping means responsive to said oscillation detected output from said oscillation detecting means for stopping said high frequency oscillation by said intermittent high frequency oscillating means, start signal generating means for generating a start signal in the vicinity of the leading edge of said low frequency ripple voltage, said intermittent high frequency oscillating means comprising self-excited oscillating circuit means responsive to said start signal from said start signal generating means for starting oscillation for maintaining said oscillation responsive to the oscillation output and for stopping said oscillation in the vicinity of the trailing end of said low frequency ripple voltage, a heat sensitive element provided in the vicinity of said load for sensing the temperature of said load, and temperature control means responsive to the output of said heat sensitive element for stopping the oscillation of said self-excited oscillation circuit means. 2. An induction heating cooking apparatus in accordance with claim 1, wherein said heat sensitive element comprises a heat sensitive resistor element, and said temperature control means comprises second resistor means connected in series with said heat sensitive resistor element, reference potential source means, potential comparing means for comparing the potential at the junction of the series connection of said heat sensitive resistor element and said second resistor means and the potential of said reference potential source means for providing an output when the potential of said junction of said series connection exceeds said potential of said reference potential source means, and temperature dependent oscillation stopping means responsive to the output of said potential comparing means for stopping the oscillation of said self-excited oscillation circuit means. 3. An induction heating cooking apparatus in accordance with claim 2, wherein said second resistor means comprises variable resistor means, whereby said temperature dependent oscillation stopping means is adapted such that the oscillation stopping temperature may be arbitrarily set by means of said variable resistor means. 4. An induction heating cooking apparatus in accordance with claim 3, wherein said second resistor means comprises a plurality of resistor elements having different resistance values, and which further comprises temperature range selecting switch means being inserted between said plurality of resistor elements and said variable resistor means for selectively connecting said variable resistor means in series with any of said plurality of resistor elements for selecting a variable temperature range. 5. An induction heating cooking apparatus in accordance with claim 4, wherein said temperature range selecting switch means comprises a plurality of first contact connected to said plurality of resistor element at one end of each thereof, a second contact connected to one end of said variable resistor means, and a switching contact for selectively connecting said second contact to any of said first contacts, and said temperature range selecting switch is structured as or non-shorting type switch for switching said switching contact from any of said plurality of first contacts to the other after said second contact is once opened. 6. An induction heating cooking apparatus in accordance with claim 1, which further comprises temperature control means responsive to the output of said heat sensitive element for stopping the oscillation of said self-excited oscillation circuit means, said temperature control means including second resistor means connected in series with said heat sensitive device, reference potential source means, potential comparing means for comparing the potential at the junction of the series connection of said heat sensitive device and said second resistor means for providing an output when the potential at said junction of said series connection exceeds the potential of said reference potential source means, and temperature dependent oscillation stopping means responsive to the output of said potential comparing means for stopping the oscillation of said self-excited oscillation circuit means, and which further comprises variable resistor means, and variable resistor selecting switch means for selectively and switchably rendering said variable resistor means associated with any of said time constant circuit means and said second resistor means, whereby said variable resistor means is adapted to be used both for said temperature control and for said output adjustment. 7. An induction heating cooking apparatus in accordance with claim 6, wherein said variable resistor selecting switch means comprises a first contact being connected to said time constant circuit means, a second contact connected to said second resistor means, and a third contact connected to one end of said variable resistor means and selectively switchable to said first contact or said second contact, said variable resistor selecting switch means being structured as a short circuiting type switch wherein said third contact is switched from one of said first and second contacts to the other of said first and second contacts after said third contact is once connected to both of said first and second contacts. 8. An induction heating cooking apparatus in accordance with claim 7, wherein said second resistor means comprises a plurality of resistor elements having different resistance values provided in parallel, and which further comprises resistor element selecting switch means for selectively connecting said variable resistor means to any of said plurality of resistor elements in series when said variable resistor means is connected to said second resistor means by means of said variable resistor selecting switch means. 9. An induction heating cooking apparatus in accordance with claim 8, wherein said variable resistor selecting switch means and said resistor element selecting switch means are structured to be switchable in a ganged fashion, and which further comprises a second resistor element, said second resistor element being connected to said second resistor means by means of said resistor element selecting switch means when said variable resistor means is connected to said time constant circuit means by means of said variable resistor selecting switch means, whereby temperature control is made by said second resistor means including said heat sensitive device and said second resistor element when said variable resistor selecting switch means is switched to said time constant circuit means. 10. An induction heating cooking apparatus in accordance with any one of the preceding claims 2 to 9, wherein said temperature dependent oscillation stopping means is responsive to the output of said potential comparing means to nullify said start signal from said start signal generating means. 11. An induction heating cooking apparatus, comprising: means for supplying ripple electric power by rectifying commercial AC electric power, means for generating a start signal at each cycle of said ripple electric power, a self-excited oscillation type inverter responsive to said start signal from said start signal generating means for starting said high frequency oscillation and for maintaining said high frequency oscillation responsive to the output therefrom, induction heating coil means for receiving the high frequency current from said self-excited oscillation type inverter for generating a high frequency alternating magnetic field for induction heating a load, heat sensing means disposed in the vicinity of said load for sensing its temperature, temperature control means responsive to the output of said heat sensing means for stopping the oscillation of said self-excited oscillation type inverter, and output control means for controlling the high frequency current from said self-excited oscillation type inverter. 12. An induction heating cooking apparatus in accordance with claim 11, which further comprises current path means for supplying said high frequency current to said induction heating coil means, and voltage signal withdrawing means provided operatively coupled to said current path means of said induction heating coil means for withdrawing a voltage signal associated with said high frequency current, said self-excited oscillation type inverter being responsive to said voltage signal from said voltage signal withdrawing means for being driven to maintain said high frequency oscillation. 13. An induction heating cooking apparatus in accordance with claim 12, wherein said self-excited oscillation type inverter comprises a switching element connected in series with said ripple power supply means as well as said induction heating coil means, a resonance capacitor connected in parallel with said switching element, and a diode connected in parallel with said switching element, and which further comprises drive means responsive to said start signal from said start signal generating means for withdrawing a drive voltage for rendering said switching element conductive. 14. An induction heating cooking apparatus in accordance with claim 13, which further comprises start signal transfer path means for transferring said start signal from said start signal generating means to said drive means, and wherein said output control means is adapted to act on said start signal transfer path means for defining a time period of said drive voltage from said drive means for defining the output of said self-excited oscillation circuit means. 15. An induction heating cooking apparatus in accordance with claim 14, wherein said output control means comprises time constant circuit means interposed between said start signal generating means and said drive means and responsive to said start signal for providing a voltage signal of a predetermined time period to said drive means, said drive means being responsive to said time period of said voltage signal obtained from said time constant circuit means for having defined the time period of said drive voltage. 16. An induction heating cooking apparatus in accordance with claim 15, which further comprises a heat sensitive device provided in the vicinity of said load for sensing the temperature of said load, said temperature control means including resistor means connected in series with said temperature sensitive device, reference potential source means, potential comparing means for comparing the potential at the junction of the series connection of said temperature sensitive device and said resistor means and the potential of said reference potential source means for providing an output when the potential at said junction of said series connection exceeds the potential of said reference potential source means, and temperature dependent oscillation stopping means responsive to the output of said potential comparing means for stopping the oscillation of said self-excited oscillation type inverter, and which further comprises variable resistor means, and variable resistor selecting switch means for selectively and switchably rendering said variable resistor means associated with any of said time constant circuit means and said resistor means, whereby said variable resistor means is adapted to be used both for said time control and for said output adjustment. 17. An induction heating cooking apparatus in accordance with claim 16, wherein said variable resistor selecting switch means comprises a first contact being connected to said time constant circuit means, a second contact connected to said resistor circuit means, and a third contact connected to one end of said variable resistor means and selectively switchable to said first contact or said second contact, said variable resistor selecting switch means being structured as a short circuiting type switch wherein said third contact is switched from one of said first and second contacts to the other of said first and second contacts after said third contact is once connected to both of said first and second contacts. 18. An induction heating cooking apparatus in accordance with claim 17, wherein said resistor means comprises a plurality of resistor elements having different resistance values provided in parallel, and which further comprises resistor element selecting switch means for selectively connecting said variable resistor means to any of said plurality of resistor elements in series when said variable resistor means is connected to said resistor means by means of said variable resistor selecting switch means. 19. An induction heating cooking apparatus in accordance with claim 18, wherein said variable resistor selecting switch means and said resistor element selecting switch means are structured to be switchable in a ganged fashion, and which further comprises a second resistor element, said second resistor element being connected to said resistor means by means of said resistor element selecting switch means when said variable resistor means is connected to said time constant circuit means by means of said variable resistor selecting switch means, whereby temperature control is made by said resistor means including said heat sensitive device and said second resistor element when said variable resistor selecting switch means is switched to said time constant circuit means. 20. An induction heating cooking apparatus in accordance with any one of the preceding claims 16 to 19, wherein said temperature dependent oscillation stopping means is responsive to the output of said potential comparing means to nullify said start signal from said start signal generating means.
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