Abstract:
A voice control electric fireplace comprises a housing, an imaging screen installed in the housing, emulating coal disposed in a lower front of the imaging screen, a flame shape board disposed in a lower back of the imaging screen, a reflecting module, and a first light source. A second light source is disposed under the emulating coal, a sound generator is installed in the housing for controlling illumination of a simulate flame of the fireplace, and the sound generator is connected to the second light source. A dynamic variation on the simulate flame is attained, which results in an attractive performance of the simulate flame.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an electric fireplace, especially to a voice control electric fireplace. 
     2. Description of the Related Art 
     The development of fireplace changes day by day. Traditionally, there are wood burning fireplaces, gas fireplaces, and charcoal fireplaces. Besides the traditional fireplaces, electric fireplaces are gradually developed today. Wherein, the electric fireplaces combine the classic form of the European fireplace and the present technology including principles of acoustics and optics. The combination not only helps protect environment but also provides a vivid simulation of burning wood. 
     Obviously, the electric fireplaces are potentially displacing the traditional fireplace. However, the more the electric fireplaces are provided, the more requirements may be raised for meeting practical demands. The electric fireplaces existing in the market merely provide ordinary imitated background flames with emulating coal. Thus, the illumination of such simulate flame is plain since a real dynamic change of burning flames is difficult to imitate. Therefore, the design of electric fireplace is limited, and the research and development are also restricted, which further affects the electric fireplace industry. 
     SUMMARY OF THE INVENTION 
     The present invention is to provide a voice control electric fireplace that receives external sounds to control the illumination of a simulate flame of the fireplace, so that the simulate flame of emulating coal dynamically changes in accordance with variations of divergent voice frequency, thereby contributing to a novel effect. 
     Afore object is achieved by following means: 
     A voice control electric fireplace comprises a housing, an imaging screen installed in the housing, emulating coal disposed in a lower front of the imaging screen, a flame shape board disposed in a lower back of the imaging screen, a reflecting module, and a first light source; characterized in that, a second light source is disposed under the emulating coal, a sound generator is installed in the housing for controlling illumination of a simulate flame of the fireplace, and the sound generator is connected to the second light source. 
     Accordingly, the present invention has following advantages. While the sound generator is provided in the existing electric fireplace, generated sound controls the illumination of the second light source disposed under the emulating coal of the electric fireplace. Concurrently, the simulate flame of the emulating coal changes subject to external sound signal. Accordingly, the dynamic simulate flame provides varied effects, which removes the plain simulate flame existing in the traditional electric fireplace. Thus, a vivid burning image is resulted, and an attractive performance of the simulate flame is achieved. The inventor hopes this innovative electric fireplace provided with the design of voice control could influence or transform the contemporary electric fireplace industry. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view showing inner structures of the present invention; and 
         FIG. 2  is a schematic view showing a circuitry of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A voice control electric fireplace switches a sound signal into a driving voltage signal via an electroacoustic transducer while an external sound is generated, thereby controlling illumination of analog flames. While a simulate flame of emulating coal changes subject to amplitude of the input sound, a lifelike burning effect is achieved. Referring to  FIGS. 1 and 2 , structures of the present invention are shown as follows: 
     Referring to  FIG. 1 , the voice control electric fireplace comprises a housing  8 , an imaging screen  10  installed in the housing, and a tempered glass  1  covering a front part of the housing. Emulating coal  3  is disposed in a lower front of the imaging screen  10 , a flame imaging room  11  is disposed around a back side of the imaging screen  10  and the housing  8 . A reflecting unit  6  that is rotated by a motor is disposed in the flame imaging room  11 . A flame shape board  7  is disposed between the reflecting unit  6  and the imaging screen  10 . A first light source  5  is disposed under the reflecting unit  6 . Rotating the reflecting unit  6  allows the first light source  5  to emit light toward the flame shape board  7 . When the light is filtered by the flame shape board  7 , a flame pattern is imaged in the imaging screen  10 . Wherein, observers could see a lifelike burning effect from a front side of the tempered glass  1 . 
     Referring to  FIGS. 1 and 2 , a second light source  4  is disposed under the emulating coal  3 . The second light source  4  adopts an LED lamp or a low-voltage bulb. A sound generator  9  that is connected to the second light source is installed in the housing  8 . As it should, be, the sound generator could be further connected to the first light. 
     The sound generator  9  includes a sound/electricity converting circuit  22 , a comparison amplification integrated chip  21 , a sensitivity regulating circuit  26 , an input regulating circuit  24 , a voltage clamp circuit  25 , a driving gear  27 , a step-down starting circuit  28 , a protecting circuit  29 , a power regulating circuit  23 , and a control load  30 . The control load adopts the second light source or further adopts the first light source. The sound/electricity converting circuit  22  is electrically connected to the comparison amplification integrated chip  21 . A signal output end of the comparison amplification integrated chip  21  is connected to the sensitivity regulating circuit  26 . A power supply end of the comparison amplification integrated chip  21  is connected to the power regulating circuit  23 . The voltage clamp circuit  25  is connected to the input regulating circuit  24 . The input regulating circuit  24  is connected to a control end of the driving gear  27 . An output end of the driving gear  27  is connected to the control load  30 . The control load  30  is connected to the protecting circuit  29 . The step-down starting circuit  28  is connected between the control load  30  and a ground terminal. 
     Modules structured in the sound generator  9  are depicted as follows: 
     The sound/electricity converting circuit  22  includes an electroacoustic transducer, current limiting resistance R 1 , and a coupling capacitance C 4 . Wherein, the sound/electricity converting circuit freely adopts a microphone MIC or ultrasound equipment that receives external audio signals and turns the audio signals into electricity. In this embodiment, the electroacoustic transducer adopts the microphone MIC. One end of the microphone MIC is connected to one ends of the current limiting resistance R 1  and the coupling capacitance C 4 . The other end of the microphone is connected to the ground terminal. The other end of the current limiting resistance R 1  is connected to a power supply end VDD. The other end of the coupling capacitance C 4  is connected to a signal input end IN of the comparison amplification integrated chip  21 . In this embodiment, the dimension of the microphone MIC is ¢9.7 mm*H6.7 mm. 
     The sensitivity regulating circuit  26  includes a potentiometer SK for regulating amplitude of input voice, three resistances R 2 , R 3 , R 4 , and a coupling capacitance C 8 . The potentiometer SK is designed with tri-in-line pins. A third pin of the potentiometer SK is connected to one end of the coupling capacitance C 8 , a second pin of the potentiometer SK is connected to one end of the resistance R 4 , and a first pin of the potentiometer SK is connected to the ground terminal. One ends of the coupling capacitance C 8  and the resistance R 2  are respectively connected to the signal input end of the comparison amplification integrated chip  21 . The other end of the resistance R 4  is connected to the signal output end of the comparison amplification integrated chip  21 . The other end of the resistance R 2  is connected to one end of the resistance R 3  and then further connected to a comparison signal input end of the comparison amplification integrated chip  21 . The other end of the resistance R 3  is connected to the ground terminal for forming a sensitive regulating circuit. 
     The input regulating circuit  24  includes a capacitance C 3 , a diode D 1 , and a current limiting resistance R 5 . One end of the capacitance C 3  is connected to a signal output end OUT of the comparison amplification integrated chip  21 . The other end of the capacitance C 3  is connected to a positive pole of the diode D 1 . A negative pole of the diode D 1  is connected to one end of the current limiting resistance R 5 . The other end of the current limiting resistance R 5  is connected to a base control end of a driving unit  18 . 
     The voltage clamp circuit includes capacitances C 5 , C 6 , and diodes D 2 , D 3 . One end of the capacitance C 5  is connected to a negative pole of the diode D 3 . The other end of the capacitance C 5  is connected to the ground terminal. A negative pole of the diode D 2  and a positive pole of the diode D 3  are respectively connected to one end of the capacitance C 3  and a positive pole of the diode D 1 . The other end of the diode D 2  is connected to the ground terminal. One end of the capacitance C 6  is connected to the ground terminal. The other end of the capacitance C 6  is connected to a negative pole of the diode D 1  and one end of the capacitance C 5 . 
     The power regulating circuit includes capacitances C 1 , C 2  and a voltage regulating module U 1 . An input terminal Vin of the voltage regulating module U 1  is connected to a power input V+. A ground terminal GND of the voltage regulating module U 1  is connected to a ground wire. An output terminal Vout of the voltage regulating module U 1  supplies regulated power VDD so as to provide electricity VDD to the comparison amplification integrated chip  21  and the sound/electricity converting circuit  22 . 
     The driving gear  27 , the control load  30 , the step-down starting circuit  28 , and the protecting circuit  29  construct a seamless driving circuit for controlling. The driving gear  27  includes triodes Q 1 , Q 2 . The step-down starting circuit  28  includes diodes D 4 , D 5 , D 6 , D 7 . The protecting circuit  29  includes a diode D 8  and a capacitance C 7 . Connections between afore electronic components are as follows: A positive pole of the diode D 8  and one end of the capacitance C 7  are connected to a collector of the triode Q 3 . A negative pole of the diode D 8  and the other end of the capacitance C 7  are connected to the power input V+. The triodes Q 1 , Q 2  are assembled to a composite transistor. An emitting pole of the triode Q 1  is connected to a base of the triode Q 2 . A collector of the triode Q 1  is connected to one end of a resistance R 6 . The other end of the resistance R 6  is connected to a power V+. The resistance R 6  provides the collector Q 1  of the triode Q 1  with upper bias supply. The collector of the triode Q 2  is connected to one end of the control load RL. The other end of the control load RL is connected to the power input V+. The step-down starting circuit  28  provides the control load RL with a lower starting power source, so that the control load RL does not lose power in a very short time. A positive pole of the diode D 4  is connected to one end of the control load RL and the collector of the triode Q 2 . A negative pole of the diode D 4  is connective to a positive pole of the diode D 5 . A negative pole of the diode D 5  is connected to a positive pole of the diode D 6 . A negative pole of the diode D 6  is connected to a positive pole of the diode D 7 . A negative pole of the diode D 7  and an emitting pole of the triode Q 2  are connected to the ground terminal. When the base of the triode Q 1  receives signals, the emitting pole of the triode Q 1  transmits control signals to the base of the triode Q 2 . Thereby, the collector of the triode Q 2  is conducted, so that the control load RL is able to operate. 
     In this embodiment, the triode Q 2  of the driving gear adopts a power triode. The triode Q 1  and the triode Q 2  are assembled to a composite triode. The triode Q 2  adopts the power triode. The step-down unit of the step-down starting circuit  28  adopts diodes D 4 , D 5 , D 6 , D 7  that are designed into series step-down. As it should be, the arrangement of the circuit is not limited. Namely, the diode could be replaced by high power resistance, so that the high power resistance could lessen the voltage. The control load RL is provided for the LED lamps set in series under the emulating coal. Thereby, illumination of each LED lamp varies in accordance with amplitude of sound signals by means of the sound generator. 
     Principle adapted to the sound generator  9  is as follows: The sound/electricity converting circuit  22  transforms the sound signal into electricity signal. Wherein, the electricity signal is further transmitted to the comparison amplification integrated chip  21 . Accordingly, the comparison amplification integrated chip  21  compares the voltage via an internal circuit amplification signal and outputs a signal for the sensitivity regulating circuit  26  to control. Moreover, the power regulating circuit  23  provides the comparison amplification integrated chip  21  with steady power. The voltage clamp circuit  25  is connected to the input regulating circuit  24 . The input regulating circuit  24  is connected to a control end of the driving gear  27 . An output end of the driving gear  27  is connected to the control load  30 . The control load  30  is protected by the protecting circuit  29  via a reverse voltage, so that the control load  30  is properly controlled.