CN103596307B - Resonant control circuit and electromagnetic heater - Google Patents
Resonant control circuit and electromagnetic heater Download PDFInfo
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- CN103596307B CN103596307B CN201310545663.7A CN201310545663A CN103596307B CN 103596307 B CN103596307 B CN 103596307B CN 201310545663 A CN201310545663 A CN 201310545663A CN 103596307 B CN103596307 B CN 103596307B
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Abstract
The invention provides a kind of resonant control circuit and a kind of electromagnetic heater, wherein, described resonant control circuit, comprising: power module; Voltage sampling circuit, for sampling to the voltage in described power module, to obtain sampled voltage; First resonant circuit; Second resonant circuit; Control circuit, for controlling described first resonant circuit or described second resonant circuit is connected with described power module, to realize the resonance of the first resonant circuit or the second resonant circuit; Controller, is connected to the output of described voltage sampling circuit and the input of described control circuit respectively, transmits control signal for the relation according to described sampled voltage and preset voltage value to described control circuit.By technical scheme of the present invention, by the resonance of different resonant circuit realizing circuit, thus can guarantee that electromagnetic heater can realize high-power output under high and low pressure.
Description
Technical field
The present invention relates to the technical field of electric appliances with electromagnetic induction, in particular to a kind of resonant control circuit and a kind of electromagnetic heater.
Background technology
At present, Household induction cooker is generally designed to single coil, even if there is the electromagnetic oven of multi-coil, is also only the object in order to reach different heating area, cannot meet and automatically switch under high and low pressure condition, also just cannot realize all exporting under high and low pressure high-power.
Therefore, how to guarantee that electromagnetic heater can realize high-power heating under high and low pressure, become technical problem urgently to be resolved hurrily at present.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art or correlation technique.
For this reason, one object of the present invention is that proposing one can ensure that under high and low pressure condition, can realize the resonant control circuit of high-power output.
Another object of the present invention is to propose a kind of electromagnetic heater.
For achieving the above object, embodiment according to a first aspect of the invention, proposes a kind of resonant control circuit, comprising: power module; Voltage sampling circuit, for sampling to the voltage in described power module, to obtain sampled voltage; First resonant circuit; Second resonant circuit; Control circuit, for controlling described first resonant circuit or described second resonant circuit is connected with described power module, to realize the resonance of the first resonant circuit or the second resonant circuit; Controller, is connected to the output of described voltage sampling circuit and the input of described control circuit respectively, transmits control signal for the relation according to described sampled voltage and preset voltage value to described control circuit.
Resonant control circuit according to an embodiment of the invention, by voltage sampling circuit, the voltage in power module is sampled, controller according to the relation of sampled voltage and preset voltage value, can be transmitted control signal to control circuit, with the resonant circuit of control realization resonance.Such as, can when sampled voltage be more than or equal to preset voltage value, can by the resonance of the first resonant circuit realizing circuit, when sampled voltage is less than preset voltage value, can by the resonance of the second resonant circuit realizing circuit, thus ensure that under high and low pressure condition, resonance is realized by different resonant circuits, when the inductance value of the first resonant circuit coil is greater than the inductance value of the second resonant circuit coil, can guarantee, under high and low pressure, high-power output can be realized.
In addition, resonant control circuit according to the above embodiment of the present invention, can also have following additional technical characteristic:
According to one embodiment of present invention, described power module, comprising: rectification circuit, is connected to AC power; Filter circuit, is connected in series with described rectification circuit; Between the input that the input of described voltage sampling circuit is connected to described AC power and described rectification circuit, between the output of described rectification circuit and the input of described filter circuit or between the output of described filter circuit and the input of described resonant circuit, to sample to the voltage in described power module.
Resonant control circuit according to an embodiment of the invention, power module is composed in series by rectification circuit and filter circuit, when carrying out voltage sample to power module, can sample at the input of rectification circuit, namely between AC power and the input of rectification circuit, also can sample at the output of rectification circuit, namely between the output of rectification circuit and the input of filter circuit, can also sample at the output of filter circuit, namely between the output of filter circuit and the input of resonant circuit.
According to one embodiment of present invention, described voltage sampling circuit comprises: rectifier cell; And at least one sectional pressure element, be connected in series with described rectifier cell.Wherein, described sectional pressure element comprises single resistance, or carries out connecting and/or multiple resistance of parallel connection.
Resonant control circuit according to an embodiment of the invention, because rectification circuit is connected to AC power, and the voltage after over commutation and/or filtering process also may have alternating component, therefore rectifier cell can be increased on voltage sampling circuit, such as diodes etc., certainly, also can increase rectification circuit in sample circuit, thus the AC portion in filtering voltage, to sample.
According to one embodiment of present invention, described control circuit is when described sampled voltage is more than or equal to described preset voltage value, control described first resonant circuit to be connected with described power module, when described sampled voltage is less than described preset voltage value, controls described second resonant circuit and be connected with described power module.
Resonant control circuit according to an embodiment of the invention, by when sampled voltage is more than or equal to preset voltage value, by the resonance of the first resonant circuit realizing circuit, when sampled voltage is less than preset voltage value, by the resonance of the second resonant circuit realizing circuit, thus ensure that under high and low pressure condition, high-power output can be realized by different resonant circuits.
According to one embodiment of present invention, the inductance value of the resonance coil in described first resonant circuit is greater than the inductance value of the resonance coil in described second resonant circuit.
Resonant control circuit according to an embodiment of the invention, by the inductance value making the inductance value of the resonance coil in the first resonant circuit be greater than the resonance coil in the second resonant circuit, ensure that when sampled voltage is more than or equal to preset voltage value, or when sampled voltage is less than preset voltage value, the high-power output of resonant circuit can both be realized.
According to one embodiment of present invention, also comprise: the first synchronized sampling circuit, the first input end of described first synchronized sampling circuit is connected to the first end of described first resonant circuit, second input of described first synchronized sampling circuit is connected to the second end of described first resonant circuit, with when the resonance of described first resonant circuit realizing circuit, the voltage at described first resonant circuit two ends is sampled; Second synchronized sampling circuit, the first input end of described second synchronized sampling circuit is connected to the first end of described second resonant circuit, second input of described second synchronized sampling circuit is connected to the second end of described second resonant circuit, with when the resonance of described second resonant circuit realizing circuit, the voltage at described second resonant circuit two ends is sampled; Power tube, the first end of described power tube is connected to the first end of described first resonant circuit and the first end of described second resonant circuit, the second end ground connection of described power tube respectively; Described controller, be connected to the output of described first synchronized sampling circuit and the output of described second synchronized sampling circuit respectively, and the control end of described power tube, for the sampled result according to described first synchronized sampling circuit or described second synchronized sampling circuit, transmit control signal to described power tube, to control the operating state of described first resonant circuit or described second resonant circuit.
Resonant control circuit according to an embodiment of the invention, by arranging two synchronized sampling circuit, to gather the voltage at the first resonant circuit and the second resonant circuit two ends respectively, make when the resonance by different resonant circuit realizing circuit, can both guarantee that the voltage difference of sampled voltage is in normal scope, the risk avoiding the exception of voltage difference to cause resonant circuit cannot normally working.
According to one embodiment of present invention, described first resonant circuit comprises: the first coil; And first electric capacity, be connected in parallel with described first coil; Described second resonant circuit comprises: the second coil; And second electric capacity, be connected with described second coils from parallel connection of coils; Second end of the second end or described second resonant circuit that described control circuit can control described first resonant circuit is connected with described power module.
Resonant control circuit according to an embodiment of the invention, first resonant circuit and the second resonant circuit have common port, namely the one end be connected with power tube respectively, second end of second end or the second resonant circuit that can control the first resonant circuit by control circuit is connected with power module, to form the resonance of corresponding resonant circuit realizing circuit.
According to one embodiment of present invention, also comprise: relay, the first end of described relay is connected to described power module, the control end of described relay is connected to the output of described control circuit, when described sampled voltage is more than or equal to described preset voltage value, the second end that described control circuit controls described relay is communicated with the second end of described first resonant circuit, to realize the resonance of described first resonant circuit, when described sampled voltage is less than described preset voltage value, the second end that described control circuit controls described relay is communicated with the second end of described second resonant circuit, to realize the resonance of described second resonant circuit.
Resonant control circuit according to an embodiment of the invention, specifically, relay can be electromagnetic relay, second end of the first resonant circuit can be connected with the normally-closed contact of electromagnetic relay, second end of the second resonant circuit is connected with the normally opened contact of electromagnetic relay, make when sampled voltage is more than or equal to preset voltage value, can by the resonance of the first resonant circuit realizing circuit, and when sampled voltage is less than preset voltage value, electromagnetic relay energising is controlled by control circuit, to be communicated with moving contact and normally opened contact, thus pass through the resonance of the second resonant circuit realizing circuit.Certainly, also the second end of the first resonant circuit can be connected with the normally opened contact of electromagnetic relay, second end of the second resonant circuit is connected with the normally-closed contact of electromagnetic relay, when sampled voltage is more than or equal to preset voltage value, control circuit controls electromagnetic relay energising, to realize the resonance of the first resonant circuit.When sampled voltage is less than preset voltage value, control electromagnetic relay no power by control circuit, to be communicated with moving contact and normally-closed contact, thus pass through the resonance of the second resonant circuit realizing circuit.
According to one embodiment of present invention, described first resonant circuit and described second resonant circuit have public capacitance, and the first end of described public capacitance is connected to the first end of described power tube, and the second end of described public capacitance is connected to described power module; Described first resonant circuit, also comprises: the first coil, and the first end of described first coil is connected to the first end of described public capacitance; Described second resonant circuit, also comprises: the second coil, and the first end of described second coil is connected to the first end of described public capacitance; Second end of the second end or described second coil that described control circuit can control described first coil is connected to the second end of described public capacitance.
Resonant control circuit according to an embodiment of the invention, first resonant circuit and the second resonant circuit can share a public capacitance, thus save the components and parts of circuit, and control the second end of the first coil by control circuit or the second end of the second coil is connected with power module (i.e. the second end of public capacitance), to form the resonance of corresponding resonant circuit realizing circuit.
According to one embodiment of present invention, also comprise: relay, the first end of described relay is connected to the second end of described public capacitance, the control end of described relay is connected to the output of described control circuit, when described sampled voltage is more than or equal to described preset voltage value, the second end that described control circuit controls described relay is communicated with the second end of described first coil, to realize the resonance of described first resonant circuit, when described sampled voltage is less than described preset voltage value, the second end that described control circuit controls described relay is communicated with the second end of described second coil, to realize the resonance of described second resonant circuit.
Resonant control circuit according to an embodiment of the invention, specifically, relay can be electromagnetic relay, second end of the first coil can be connected with the normally-closed contact of electromagnetic relay, second end of the second coil is connected with the normally opened contact of electromagnetic relay, make when sampled voltage is more than or equal to preset voltage value, the resonance of the first resonant circuit realizing circuit can be made up of the first coil and public capacitance, and when sampled voltage is less than preset voltage value, electromagnetic relay energising is controlled by control circuit, to be communicated with moving contact and normally opened contact, thus the resonance of the second resonant circuit realizing circuit can be made up of the second coil and public capacitance.Certainly, also the second end of the first coil can be connected with the normally opened contact of electromagnetic relay, second end of the second coil is connected with the normally-closed contact of electromagnetic relay, when sampled voltage is more than or equal to preset voltage value, control circuit controls electromagnetic relay energising, to realize the resonance of the first resonant circuit.When sampled voltage is less than preset voltage value, control electromagnetic relay no power by control circuit, to be communicated with moving contact and normally-closed contact, thus pass through the resonance of the second resonant circuit realizing circuit.
According to one embodiment of present invention, described synchronized sampling circuit comprises: carry out the multiple sectional pressure elements be connected in series; Wherein, described sectional pressure element comprises single resistance, or carries out connecting and/or multiple resistance of parallel connection.
Embodiment according to a second aspect of the present invention proposes a kind of electromagnetic heater, comprises the resonant control circuit described in above-mentioned any embodiment.
Electromagnetic heater according to an embodiment of the invention, by voltage sampling circuit, the voltage in power module is sampled, make when sampled voltage is more than or equal to preset voltage value, can by the resonance of the first resonant circuit realizing circuit, when sampled voltage is less than preset voltage value, can by the resonance of the second resonant circuit realizing circuit, thus ensure that at height, under lower pressure, resonance is realized by different resonant circuits, when the inductance value of the first resonant circuit coil is greater than the inductance value of the second resonant circuit coil, can guarantee at height, under low pressure, high-power output can be realized.
Electromagnetic heater can be electric cooker, electromagnetic oven, and electric pressure cooker etc.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 shows the schematic block diagram of resonant control circuit according to an embodiment of the invention;
Fig. 2 A shows the structural representation of resonant circuit according to an embodiment of the invention;
Fig. 2 B shows the structural representation of resonant circuit according to another embodiment of the invention;
Fig. 3 shows the electrical block diagram of resonant control circuit according to an embodiment of the invention.
Embodiment
In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
Set forth a lot of detail in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not by the restriction of following public specific embodiment.
Fig. 1 shows the schematic block diagram of resonant control circuit according to an embodiment of the invention.
As shown in Figure 1, resonant control circuit 100 according to an embodiment of the invention, comprising: power module 102; Voltage sampling circuit 104, for sampling to the voltage in described power module 102, to obtain sampled voltage; First resonant circuit 106; Second resonant circuit 108; Control circuit 114, for controlling described first resonant circuit 106 or described second resonant circuit 108 is connected with described power module 102, to realize the resonance of the first resonant circuit 106 or the second resonant circuit 108; Controller 116, is connected to the output (not shown annexation) of described voltage sampling circuit and the input of described control circuit respectively, transmits control signal for the relation according to described sampled voltage and preset voltage value to described control circuit.
Sampled by the voltage in voltage sampling circuit 104 pairs of power modules 102, controller 116 according to the relation of sampled voltage and preset voltage value, can be transmitted control signal to control circuit 114, with the resonant circuit of control realization resonance.Such as, can when sampled voltage be more than or equal to preset voltage value, can by the resonance of the first resonant circuit 106 realizing circuit, when sampled voltage is less than preset voltage value, can by the resonance of the second resonant circuit 108 realizing circuit, thus ensure that under high and low pressure condition, resonance is realized by different resonant circuits, when the inductance value of the first resonant circuit 106 coil is greater than the inductance value of the second resonant circuit 108 coil, can guarantee, under high and low pressure, high-power output can be realized.
In addition, resonant control circuit according to the above embodiment of the present invention, can also have following additional technical characteristic:
According to one embodiment of present invention, described power module 102, comprising: rectification circuit 1022, is connected to AC power; Filter circuit 1024, is connected in series with described rectification circuit 1022; Between the input that the input of described voltage sampling circuit 104 is connected to described AC power and described rectification circuit 1022, between the output of described rectification circuit 1022 and the input of described filter circuit 1024 or between the output of described filter circuit 1024 and the input of described resonant circuit (can be the first resonant circuit 106 or the second resonant circuit 108 shown in figure) (not shown annexation), to sample to the voltage in described power module 102.
Power module 102 is composed in series by rectification circuit 1022 and filter circuit 1024, when carrying out voltage sample to power module 102, can sample at the input of rectification circuit 1022, between the input of i.e. AC power and rectification circuit 1022, also can sample at the output of rectification circuit 1022, namely between the output of rectification circuit 1022 and the input of filter circuit 1024, can also sample at the output of filter circuit 1024, namely between the output of filter circuit 1024 and the input of resonant circuit.
According to one embodiment of present invention, described voltage sampling circuit 104 comprises: rectifier cell; And at least one sectional pressure element, be connected in series with described rectifier cell.Wherein, described sectional pressure element comprises single resistance, or carries out connecting and/or multiple resistance of parallel connection.
Because rectification circuit 1022 is connected to AC power, and the voltage after over commutation and/or filtering process also may have alternating component, therefore rectifier cell can be increased on voltage sampling circuit, such as diode etc., certainly, also rectification circuit can be increased in voltage sampling circuit 104, thus the AC portion in filtering voltage, to carry out voltage sample.
According to one embodiment of present invention, described control circuit 114 is when described sampled voltage is more than or equal to described preset voltage value, control described first resonant circuit 106 to be connected with described power module 102, when described sampled voltage is less than described preset voltage value, controls described second resonant circuit 108 and be connected with described power module 102.
By when sampled voltage is more than or equal to preset voltage value, by the resonance of the first resonant circuit 106 realizing circuit, when sampled voltage is less than preset voltage value, by the resonance of the second resonant circuit 108 realizing circuit, thus ensure that under high and low pressure condition, high-power output can be realized by different resonant circuits.
According to one embodiment of present invention, the inductance value of the resonance coil in described first resonant circuit 106 is greater than the inductance value of the resonance coil in described second resonant circuit 108.
By the inductance value making the inductance value of the resonance coil in the first resonant circuit 106 be greater than the resonance coil in the second resonant circuit 108, ensure that when sampled voltage is more than or equal to preset voltage value, or when sampled voltage is less than preset voltage value, the high-power output of resonant circuit can both be realized.
According to one embodiment of present invention, also comprise: the first synchronized sampling circuit 110, the first input end of described first synchronized sampling circuit 110 is connected to the first end of described first resonant circuit 106, second input of described first synchronized sampling circuit 110 is connected to the second end of described first resonant circuit 106, with when the resonance of described first resonant circuit 106 realizing circuit, the voltage at described first resonant circuit 106 two ends is sampled; Second synchronized sampling circuit 112, the first input end of described second synchronized sampling circuit 112 is connected to the first end of described second resonant circuit 108, second input of described second synchronized sampling circuit 112 is connected to the second end of described second resonant circuit 108, with when the resonance of described second resonant circuit 108 realizing circuit, the voltage at described second resonant circuit 108 two ends is sampled; Power tube (not shown), the first end of described power tube is connected to the first end of described first resonant circuit and the first end of described second resonant circuit, the second end ground connection of described power tube respectively; Described controller 116, be connected to the output of described first synchronized sampling circuit 110 and the output of described second synchronized sampling circuit 112 respectively, and the control end of described power tube, for the sampled result according to described first synchronized sampling circuit 110 or described second synchronized sampling circuit 112, transmit control signal to described power tube, to control the operating state of described first resonant circuit 106 or described second resonant circuit 108.
By arranging two synchronized sampling circuit, to gather the voltage of the first resonant circuit 106 and the second resonant circuit 108 two ends respectively, make when the resonance by different resonant circuit realizing circuit, can both guarantee that the voltage difference of sampled voltage is in normal scope, the risk avoiding the exception of voltage difference to cause resonant circuit cannot normally working.
The composition of the first resonant circuit 106 and the second resonant circuit 108, and the control mode of control circuit 114 to the first resonant circuit 106 and the second resonant circuit 108 can have the following two kinds execution mode:
Execution mode one
As shown in Figure 2 A, the first resonant circuit 106 shown in Fig. 1 comprises: the first coil 202; And first electric capacity 204, be connected in parallel with described first coil 202; The second resonant circuit 108 shown in Fig. 1 comprises: the second coil 206; And second electric capacity 208, be connected in parallel with described second coil 206; The first end of described first resonant circuit 106 is all connected with transistor 216 with the first end of described second resonant circuit 108, and the second end of the second end or described second resonant circuit 108 that the control circuit 114 shown in second end ground connection Fig. 1 of transistor 216 can control described first resonant circuit 106 is connected with described power module.
Resonant control circuit according to an embodiment of the invention, first resonant circuit 106 and the second resonant circuit 108 have common port, namely the one end be connected with power tube 216 respectively, second end of second end or the second resonant circuit 108 that can control the first resonant circuit 106 by control circuit 114 is connected with power module, to form the resonance of corresponding resonant circuit realizing circuit.
When control circuit 114 in FIG controls, can by controlling electromagnetic relay to control the resonant circuit of place in circuit, specifically, as shown in Figure 2 A, the moving contact 214 of electromagnetic relay is connected to the described power module 102 shown in Fig. 1, the normally-closed contact 210 of described electromagnetic relay is connected to the second end of described first resonant circuit 106, the normally opened contact 212 of described electromagnetic relay is connected to the second end of described second resonant circuit 108, when described sampled voltage is more than or equal to described preset voltage value, described control circuit 114 controls described electromagnetic relay no power, to realize the resonance of described first resonant circuit 106, when described sampled voltage is less than described preset voltage value, described control circuit 114 controls the energising of described electromagnetic relay, to realize the resonance of described second resonant circuit 108.
Certainly, also the second end of the first resonant circuit 106 can be connected with the normally opened contact 212 of electromagnetic relay, second end of the second resonant circuit 108 is connected with the normally-closed contact 210 of electromagnetic relay, when sampled voltage is more than or equal to preset voltage value, control circuit 114 controls electromagnetic relay energising, to realize the resonance of the first resonant circuit 106.When sampled voltage is less than preset voltage value, control electromagnetic relay no power by control circuit 114, to be communicated with moving contact 214 and normally-closed contact 210, thus pass through the resonance of the second resonant circuit 108 realizing circuit.
Execution mode two
As shown in Figure 2 B, do not mark in first resonant circuit 106(Fig. 2 B) with described second resonant circuit 108(Fig. 2 B in do not mark) there is public capacitance 216, the first end of described public capacitance 216 is connected to the first end of described power tube 216, second end ground connection of described transistor 216, the second end of described public capacitance 216 is connected to described power module 102; Described first resonant circuit 106, also comprises: the first coil 202, and the first end of described first coil 202 is connected to the first end of described public capacitance 216; Described second resonant circuit 108, also comprises: the second coil 206, and the first end of described second coil 206 is connected to the first end of described public capacitance 216; Second end of the second end or described second coil 206 that described control circuit 114 can control described first coil 202 is connected to the second end of described resonant capacitance.
Resonant control circuit according to an embodiment of the invention, first resonant circuit 106 and the second resonant circuit 108 can share a public capacitance 216, thus save the components and parts of circuit, and control the second end of the first coil 202 by control circuit 114 or the second end of the second coil 206 is connected with power module (i.e. the second end of public capacitance), to form the resonance of corresponding resonant circuit realizing circuit.
When control circuit 114 in FIG controls, can by controlling electromagnetic relay to control the resonant circuit of place in circuit, specifically, as shown in Figure 2 B, the moving contact 214 of electromagnetic relay (not shown in Fig. 2 B) is connected to the second end of described public capacitance 216, the normally-closed contact 210 of described electromagnetic relay is connected to the second end of described first coil 202, the normally opened contact 212 of described electromagnetic relay is connected to the second end of described second coil 206, when described sampled voltage is more than or equal to described preset voltage value, described control circuit 114 controls described electromagnetic relay no power, described first coil 202 and described public capacitance 216 realize the resonance of described first resonant circuit 106, when described sampled voltage is less than described preset voltage value, described control circuit 114 controls the energising of described electromagnetic relay, described second coil 206 and described public capacitance 216 realize the resonance of described second resonant circuit 108.
Certainly, also the second end of the first coil 202 can be connected with the normally opened contact 212 of electromagnetic relay, second end of the second coil 206 is connected with the normally-closed contact 210 of electromagnetic relay, when sampled voltage is more than or equal to preset voltage value, control circuit 114 controls electromagnetic relay energising, to realize the resonance of the first resonant circuit 106.When sampled voltage is less than preset voltage value, control electromagnetic relay no power by control circuit 114, to be communicated with moving contact 214 and normally-closed contact 210, thus pass through the resonance of the second resonant circuit 108 realizing circuit.
Fig. 3 shows the schematic diagram of resonant control circuit according to an embodiment of the invention.
As shown in Figure 3, resonant control circuit according to an embodiment of the invention, wherein, rectification circuit 1022, filter circuit 1024 and resonant circuit 306 are connected in series, rectification circuit 1022 is connected to AC power, voltage sampling circuit 104 is for the input terminal voltage to collection rectification circuit 1022, certainly, the input of voltage sampling circuit 104 also can be connected between the output of rectification circuit 1022 and filter circuit 1024, or between the input of the output of filter circuit 1024 and resonant circuit 306.
Voltage sampling circuit 104 is made up of at least one sectional pressure element carrying out being connected in series.Wherein, sectional pressure element comprises single resistance (as shown in Figure 3 310), or carries out connecting and/or multiple resistance of parallel connection.
Because rectification circuit 1022 is connected to AC power, and the voltage after over commutation and/or filtering process also may have alternating component, therefore rectifier cell can be increased on voltage sampling circuit 104, rectifier cell can be the diode 308 etc. shown in Fig. 3, certainly, also rectification circuit can be increased in sample circuit, thus the AC portion in filtering voltage, to sample.
Resonant circuit 306, comprise the first resonant circuit (not marking in Fig. 3) and the second resonant circuit (not marking in Fig. 3), the control circuit 114 shown in Fig. 1 can control place in circuit to realize the resonant circuit of resonance.Wherein the first resonant circuit and the second resonant circuit have public capacitance 216, and one end of public capacitance 216 is connected to the output of filter circuit 1024, and the other end is connected to the first end of transistor 314, the second end ground connection of transistor 314.One end of the first coil 202 in first resonant circuit 106 is connected with the normally-closed contact 210 of electromagnetic relay 302, one end of the second coil 206 in second resonant circuit 108 is connected with the normally opened contact 212 of electromagnetic relay 302, and the moving contact 214 of electromagnetic relay 302 is connected to one end of public capacitance 216.
The voltage of voltage sampling circuit 104 pairs of power modules is sampled, and sampled voltage is sent to the controller 116 shown in Fig. 1, and wherein, voltage module comprises rectification circuit 1022 and filter circuit 1024.When the sampled voltage of voltage sampling circuit 104 is more than or equal to preset voltage value, the collector electrode of the triode switch 304 in control circuit 114 and emitter not conducting, electromagnetic relay does not work, and the first coil 202 and public capacitance 216 form the resonance of resonant circuit realizing circuit.
When the sampled voltage of voltage sampling circuit 104 is less than preset voltage value, controller 116 transmits control signal to control circuit 114, to make collector electrode and the emitter conducting of triode switch 304, electromagnetic relay works, moving contact 214 is connected with normally opened contact 212, and the second coil 206 and public capacitance 216 form the resonance of resonant circuit realizing circuit.The inductance value of the first coil 202 can be greater than the inductance value of the second coil 206, thus makes when high and low pressure, can the high-power output of realizing circuit.
Owing to being provided with two coils, with at height, resonant circuit is formed by different coils and public capacitance 216 respectively during low pressure, therefore in order to ensure when the resonance of two resonant circuits difference realizing circuit, the voltage difference of the voltage that synchronized sampling circuit 312 samples is in normal scope, need to arrange different synchronized sampling circuit for each resonant circuit respectively, as shown in Figure 3, resistance R4, R5 and R6 constitutes the first input end of the first synchronized sampling circuit, resistance R7, R8 and R9 constitutes the second input of the first synchronized sampling circuit, resistance R1, R2 and R3 constitutes the first input end of the second synchronized sampling circuit, second synchronized sampling circuit and the first synchronized sampling circuit have shared second input.The voltage difference at the resonant circuit two ends collected is sent in the controller 116(Fig. 3 shown in Fig. 1 not shown by synchronized sampling circuit 312), to make controller 116 transmit control signal to transistor 314, to control the operating state of resonant circuit 306.Drive circuit 316 can also be set between controller 116 and transistor 314, carry out work with driving transistors 314.
Resistive element in synchronized sampling circuit can be single resistance, also can be to carry out connecting and/or multiple resistance of parallel connection.
More than be described with reference to the accompanying drawings technical scheme of the present invention, by technical scheme of the present invention, by the resonance of different resonant circuit realizing circuit, thus can have guaranteed that electromagnetic heater can realize high-power output under high and low pressure.Simultaneously, two synchronized sampling circuit are set, to gather the voltage at different resonant circuit two ends respectively, make when the resonance by different resonant circuit realizing circuit, can both guarantee that the voltage difference of sampled voltage is in normal scope, the risk avoiding the exception of voltage difference to cause resonant circuit cannot normally working.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a resonant control circuit, is characterized in that, comprising:
Power module;
Voltage sampling circuit, for sampling to the voltage in described power module, to obtain sampled voltage;
First resonant circuit;
Second resonant circuit;
Control circuit, for controlling described first resonant circuit or described second resonant circuit is connected with described power module, to realize the resonance of the first resonant circuit or the second resonant circuit;
Controller, is connected to the output of described voltage sampling circuit and the input of described control circuit respectively, transmits control signal for the relation according to described sampled voltage and preset voltage value to described control circuit.
2. resonant control circuit according to claim 1, is characterized in that, described power module, comprising:
Rectification circuit, is connected to AC power;
Filter circuit, is connected in series with described rectification circuit;
Between the input that the input of described voltage sampling circuit is connected to described AC power and described rectification circuit, between the output of described rectification circuit and the input of described filter circuit or between the output of described filter circuit and the input of described resonant circuit, to sample to the voltage in described power module.
3. resonant control circuit according to claim 1, is characterized in that, described voltage sampling circuit comprises:
Rectifier cell; And
At least one sectional pressure element, is connected in series with described rectifier cell.
4. resonant control circuit according to claim 1, it is characterized in that, described control circuit is when described sampled voltage is more than or equal to described preset voltage value, control described first resonant circuit to be connected with described power module, when described sampled voltage is less than described preset voltage value, controls described second resonant circuit and be connected with described power module.
5. resonant control circuit according to claim 4, is characterized in that, the inductance value of the resonance coil in described first resonant circuit is greater than the inductance value of the resonance coil in described second resonant circuit.
6. resonant control circuit according to claim 1, is characterized in that, also comprises:
First synchronized sampling circuit, the first input end of described first synchronized sampling circuit is connected to the first end of described first resonant circuit, second input of described first synchronized sampling circuit is connected to the second end of described first resonant circuit, with when the resonance of described first resonant circuit realizing circuit, the voltage at described first resonant circuit two ends is sampled;
Second synchronized sampling circuit, the first input end of described second synchronized sampling circuit is connected to the first end of described second resonant circuit, second input of described second synchronized sampling circuit is connected to the second end of described second resonant circuit, with when the resonance of described second resonant circuit realizing circuit, the voltage at described second resonant circuit two ends is sampled;
Power tube, the first end of described power tube is connected to the first end of described first resonant circuit and the first end of described second resonant circuit, the second end ground connection of described power tube respectively;
Described controller, be connected to the output of described first synchronized sampling circuit and the output of described second synchronized sampling circuit respectively, and the control end of described power tube, for the sampled result according to described first synchronized sampling circuit or described second synchronized sampling circuit, transmit control signal to described power tube, to control the operating state of described first resonant circuit or described second resonant circuit.
7. resonant control circuit according to claim 6, is characterized in that, described first resonant circuit comprises:
First coil; And
First electric capacity, is connected in parallel with described first coil;
Described second resonant circuit comprises:
Second coil; And
Second electric capacity, is connected in parallel with described second coil;
Second end of the second end or described second resonant circuit that described control circuit can control described first resonant circuit is connected with described power module.
8. resonant control circuit according to claim 7, is characterized in that, also comprises:
Relay, the first end of described relay is connected to described power module, the control end of described relay is connected to the output of described control circuit, when described sampled voltage is more than or equal to described preset voltage value, the second end that described control circuit controls described relay is communicated with the second end of described first resonant circuit, to realize the resonance of described first resonant circuit, when described sampled voltage is less than described preset voltage value, the second end that described control circuit controls described relay is communicated with the second end of described second resonant circuit, to realize the resonance of described second resonant circuit.
9. resonant control circuit according to claim 6, it is characterized in that, described first resonant circuit and described second resonant circuit have public capacitance, and the first end of described public capacitance is connected to the first end of described power tube, and the second end of described public capacitance is connected to described power module;
Described first resonant circuit, also comprises:
First coil, the first end of described first coil is connected to the first end of described public capacitance;
Described second resonant circuit, also comprises:
Second coil, the first end of described second coil is connected to the first end of described public capacitance;
Second end of the second end or described second coil that described control circuit can control described first coil is connected to the second end of described public capacitance.
10. resonant control circuit according to claim 9, is characterized in that, also comprises:
Relay, the first end of described relay is connected to the second end of described public capacitance, the control end of described relay is connected to the output of described control circuit, when described sampled voltage is more than or equal to described preset voltage value, the second end that described control circuit controls described relay is communicated with the second end of described first coil, to realize the resonance of described first resonant circuit, when described sampled voltage is less than described preset voltage value, the second end that described control circuit controls described relay is communicated with the second end of described second coil, to realize the resonance of described second resonant circuit.
11. resonant control circuits according to any one of claim 6 to 10, it is characterized in that, described synchronized sampling circuit comprises: carry out the multiple sectional pressure elements be connected in series;
Wherein, described sectional pressure element comprises single resistance, or carries out connecting and/or multiple resistance of parallel connection.
12. 1 kinds of electromagnetic heaters, is characterized in that, comprise the resonant control circuit according to any one of claim 1 to 11.
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| CN201310545663.7A CN103596307B (en) | 2013-11-05 | 2013-11-05 | Resonant control circuit and electromagnetic heater |
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| CN201310545663.7A CN103596307B (en) | 2013-11-05 | 2013-11-05 | Resonant control circuit and electromagnetic heater |
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| ITTO20120896A1 (en) | 2012-10-15 | 2014-04-16 | Indesit Co Spa | INDUCTION HOB |
| US10605464B2 (en) | 2012-10-15 | 2020-03-31 | Whirlpool Corporation | Induction cooktop |
| CN104214804B (en) * | 2014-09-15 | 2017-01-25 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device and cookware detecting method thereof |
| CN105790546B (en) * | 2014-12-17 | 2018-09-04 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic resonant circuit and its control method and control system |
| CN107690207A (en) * | 2016-08-04 | 2018-02-13 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooker |
| CN108882421B (en) * | 2017-05-11 | 2021-05-07 | 佛山市顺德区美的电热电器制造有限公司 | Heating control method, heating control device and electromagnetic heating equipment |
| EP3432682A1 (en) | 2017-07-18 | 2019-01-23 | Whirlpool Corporation | Method for operating an induction cooking hob and cooking hob using such method |
| US10993292B2 (en) | 2017-10-23 | 2021-04-27 | Whirlpool Corporation | System and method for tuning an induction circuit |
| CN109945247B (en) * | 2017-12-21 | 2020-05-05 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic cooking appliance and power control method thereof |
| CN109945248B (en) * | 2017-12-21 | 2020-06-05 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic cooking appliance and power control method thereof |
| KR102327494B1 (en) * | 2018-04-03 | 2021-11-16 | 포샨 순더 메이디 일렉트리컬 히팅 어플라이언시스 메뉴팩쳐링 코., 리미티드 | Electromagnetic heating cooker, heating control circuit and control method of electromagnetic heating cooker |
| US11140751B2 (en) | 2018-04-23 | 2021-10-05 | Whirlpool Corporation | System and method for controlling quasi-resonant induction heating devices |
| CN113795061A (en) * | 2021-10-21 | 2021-12-14 | 珠海格力电器股份有限公司 | Heating system, failure detection method and device including multi-stage electromagnetic heating unit |
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| FR2773014B1 (en) * | 1997-12-23 | 2000-03-03 | Europ Equip Menager | DEVICE FOR SUPPLYING MULTIPLE RESONANT CIRCUITS BY AN INVERTER POWER GENERATOR |
| JP2001196156A (en) * | 2000-01-12 | 2001-07-19 | Hitachi Hometec Ltd | Induction heating cooker |
| EP1194011B1 (en) * | 2000-09-29 | 2008-09-10 | BSH Bosch und Siemens Hausgeräte GmbH | Inverter circuit and its method of controlling |
| ES2330496B1 (en) * | 2007-10-31 | 2010-09-08 | Bsh Electrodomesticos España, S.A. | COOKING DEVICE. |
| CN101909375B (en) * | 2009-06-08 | 2012-11-28 | 深圳市鑫汇科科技有限公司 | High-power electromagnetic oven circuit based on SoC (System On Chip) chip |
| CN202761034U (en) * | 2012-06-28 | 2013-03-06 | 九阳股份有限公司 | Intelligent food processing machine |
| CN202840661U (en) * | 2012-09-20 | 2013-03-27 | 深圳市鑫汇科电子有限公司 | Low standby power consumption electromagnetic oven circuit |
| CN203136220U (en) * | 2013-02-21 | 2013-08-14 | 美的集团股份有限公司 | Electromagnetic heating device |
| CN203661321U (en) * | 2013-11-05 | 2014-06-18 | 美的集团股份有限公司 | Resonance control circuit and electromagnetic heating device |
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