CN100358396C - Power supply circuit for high-frequency electronic food heater - Google Patents
Power supply circuit for high-frequency electronic food heater Download PDFInfo
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- CN100358396C CN100358396C CNB01132841XA CN01132841A CN100358396C CN 100358396 C CN100358396 C CN 100358396C CN B01132841X A CNB01132841X A CN B01132841XA CN 01132841 A CN01132841 A CN 01132841A CN 100358396 C CN100358396 C CN 100358396C
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Abstract
The present invention relates to a power supply circuit for a high-frequency electronic food heater. The present invention is formed by combining a power supply part of a microprocessor and a light emitting diode power supply part into a whole. The present invention comprises a microprocessor for controlling cooking actions of the high-frequency electronic food heater, a light emitting diode, a relay for driving a magnetron, a transformer with a primary coil and two secondary coils, a first diode, a second diode, a third diode, a first capacitor, a second capacitor, a voltage stabilizing circuit and a third capacitor, wherein the first diode, the secondary diode and the third diode are respectively connected with two coil connecting terminals and two additional terminals on both secondary sides of the transformer to rectify the secondary output of the transformer; the first capacitor is connected with the first diode and the second diode, and the first capacitor enables the output of the first diode to be smooth; the second capacitor is connected with the first capacitor in series and is connected with the second capacitor and the third capacitor, and the second capacitor enables the output of the second diode and the third diode to be smooth. The input terminal and the earth terminal of the voltage stabilizing circuit are connected with two terminals of one of the first capacitor and the second capacitor, and thus, the capacitor output keeps certain level. The third capacitor is connected with the output terminal and the earthing terminal of the voltage stabilizing circuit and provides an action power supply for the microprocessor and the light emitting diode.
Description
Technical field
The present invention relates to a kind of high-frequency electronic food heater, particularly a kind ofly will constitute the power circuit of the high-frequency electronic food heater of power circuit with being combined into one to each power circuit of the microprocessor of high-frequency electronic food heater and light-emitting diode power supply.
Background technology
Usually, high-frequency electronic food heater is the cooking device of cooking food, is meant that the microwave with number GHz heats, the cooking device of cooking food.
The microwave of the severals GHz that produced by high-frequency electronic food heater vibrates as the molecule of the food of cooking object etc., by intermolecular frictional heat, makes the temperature rising of food, cooks.
High-frequency electronic food heater has high-pressure installation such as the magnetron that produces microwave and drives and is used to the power supply unit controlling the microprocessor of magnetron action and be used to show the low-voltage devices such as light-emitting diode of high-frequency electronic food heater operate condition.
The following describes the high-frequency electronic food heater power circuit of prior art.
The structure of the high-frequency electronic food heater power circuit of prior art as shown in Figure 1.
Comprise: to power supply of microprocessor portion that microprocessor power supply is used, to the B of LED power source portion and the transformer PT10 of light-emitting diode power supply usefulness, this transformer PT10 is corresponding to the terminal of the secondary side of described power supply of microprocessor portion power supply with to each turn ratio of other secondary side terminal of the B of LED power source portion power supply, and the alternating current commonly used of primary side induction is reduced pressure.
The described power supply of microprocessor A of portion is made of two diode D10, D20 and capacitor C 10, its output voltage 12V constitutes by being used for full-wave rectifying circuit, voltage stabilizing circuit P10 and the capacitor C 30 of magnetron with relay (not shown) driving power, supplies with reset circuit RS10 and described microprocessor M10 by the direct voltage of described capacitor C 30 two ends output.
Half-wave rectifying circuit, voltage stabilizing circuit and electric capacity that the described LED power source B of portion is made of diode and electric capacity constitute, and are used as the driving voltage of light-emitting diode from the direct voltage of described electric capacity output.
The following describes the course of action of power circuit of the high-frequency electronic food heater of described prior art shown in Figure 1.
When high-frequency electronic food heater was supplied with alternating voltage, the primary side by transformer applied voltage, exports post-decompression alternating voltage by the terminal of secondary side.
The voltage of the terminal of described Circuit Fault on Secondary Transformer is the alternating voltage that can not drive described microprocessor, so should be transformed to direct voltage.
Therefore, on the terminal of secondary side of the described transformer of the described post-decompression alternating voltage of output, be connected with diode and electric capacity, constitute the circuit shown in A.
Through the post-decompression alternating voltage of the terminal feeding of described Circuit Fault on Secondary Transformer, by described two diode D10, D20 the time, be transformed to direct voltage.
In addition, during by described electric capacity, remove the pulsating current be contained in the described direct voltage, thus the direct voltage that has improved.
Described direct voltage is as the driving voltage of high accuracy element such as described microprocessor the time, because magnitude of voltage not necessarily and unstable, so be not enough to as driving power.
Therefore, the described unsettled direct voltage with output is applied to voltage stabilizing circuit, the direct voltage of supply through improving.
The direct voltage of described voltage stabilizing circuit output is through reset circuit, connects (+) voltage on the 28th terminal of the voltage terminal of described microprocessor, connects (-) voltage on the 14th terminal, drives described microprocessor.
In addition, through the post-decompression alternating voltage of the terminal of described Circuit Fault on Secondary Transformer, after connecting 1 diode and 1 half-wave rectifying circuit rectification that electric capacity constituted, supply with voltage stabilizing circuit.
At this moment, because described light-emitting diode drive division does not need to resemble the so high-precision direct voltage of described microprocessor, so use half-wave rectifying circuit to supply with direct voltage.
Then, after the dc voltage conversion that described voltage stabilizing circuit P20 exports half-wave rectifying circuit is drivable direct voltage, galvanic current is pressed supply light-emitting diode L10 by electric capacity.
Described direct voltage connects resistance R 10 and the positive terminal of the light-emitting diode L10 of forming circuit as drive voltage supply in transistorized collector electrode portion.
The following describes the course of action of light-emitting diode.
When sending drive signal from described microprocessor to the ground level terminal input signal of described transistor Q10, connect described transistor, make conducting between the collector and emitter.
Therefore, closed circuit by power supply and light-emitting diode formation that described electric capacity is supplied with, described light-emitting diode is luminous by described direct voltage.
Therefore, though from the secondary side terminal that differs from one another of described transformer to described power supply of microprocessor A of portion and described LED power source portion service voltage, but by the earth terminal of connection reset circuit and the earth terminal of described light-emitting diode drive division, form same earthing power supply, prevent the generation of potential difference.
The existing high-frequency electronic food heater power circuit that carries out above-mentioned action has the potential circuit of the driving voltage that forms microprocessor and Light-Emitting Diode respectively.
Therefore, owing to constitute two independently power circuits, exist the problem that number of elements, circuit complicate and manufacturing expense rises when forming circuit that increase has.
In addition, in the prior art, supply with the voltage of exporting through the terminal of described Circuit Fault on Secondary Transformer to each power supply unit A, B, should increase the number of terminals of described Circuit Fault on Secondary Transformer for the power circuit after each power circuit dualization.Therefore, the transformer of prior art exists the problem of using the transformer efficiency reduction that takes place of appending owing to the terminal of the secondary side of described transformer.
Summary of the invention
In order to solve above-mentioned prior art problems, the object of the present invention is to provide a kind of power circuit of high-frequency electronic food heater, formation can reduce manufacturing expense with the power circuit that power supply of microprocessor portion and LED power source portion are combined into one, and improves the efficient of transformer.
To achieve these goals, the power circuit of high-frequency electronic food heater of the present invention comprises: high-frequency electronic food heater cooking action control shows with microprocessor, according to the action command of described microprocessor and also comprises the light-emitting diode and the driven by magnetron relay of high-frequency electronic food heater operate condition: the transformer with primary coil and two secondary coils; The the 1st to the 3rd diode, its end separately is connected with the link of two secondary coils of the described transformer that comprises a common connection end, and its other end separately is connected with other two terminals, to secondary output the carrying out rectification of described transformer; Connect the described the 1st and the 2nd diode, make the 1st electric capacity of the output smoothing of described the 1st diode; Be connected with described the 1st capacitances in series and be connected with the 3rd diode, so that the 2nd electric capacity of the described the 2nd and the 3rd diode output smoothing with the 2nd; Its input and earth terminal are connected on one the two ends in the described the 1st and the 2nd electric capacity and this electric capacity output are remained the voltage stabilizing circuit of certain level; Described circuit output end of pressure-stabilizing; Be connected and supply with the 3rd electric capacity of action power to described microprocessor and light-emitting diode with earth terminal.
Description of drawings
Fig. 1 is the power circuit diagram of the high-frequency electronic food heater of prior art;
Fig. 2 is the power circuit diagram of high-frequency electronic food heater of the present invention.
Embodiment
Illustrate in greater detail the present invention with reference to the accompanying drawings.
Fig. 2 is the structure chart of the power circuit of high-frequency electronic food heater of the present invention.
As shown in Figure 2, the present invention unlike the prior art, the number of elements of power circuit reduces, circuit constitutes simple, the number of terminals of the secondary side of transformer reduces.That is, by two power supply unit A and B are combined the shared grounding terminal, to remove unnecessary unnecessary terminal.
Therefore, by reducing the number of terminals of Circuit Fault on Secondary Transformer, be expected to improve the efficient of transformer.
Explain the annexation of high-frequency electronic food heater power circuit of the present invention below with reference to Fig. 2.
In the present invention, on the terminal of Circuit Fault on Secondary Transformer, connect the positive terminal of second tube sheet, once supply with the output voltage that magnetron is used with the relay driving power by electric capacity.In addition, described electric capacity is connected on the input terminal of voltage stabilizing circuit, the voltage of exporting through the two ends of described electric capacity is input on the described voltage stabilizing circuit.
Then, the lead-out terminal of described voltage stabilizing circuit is connected on the electric capacity, the input terminal that connects described electric capacity and reset circuit is with to described reset circuit voltage supplied.
In addition, the terminal of described electric capacity supplies (+) voltage to No. 28 terminal of described microprocessor, and supplies (-) voltage to No. 14 terminal, simultaneously, supplies with light-emitting diode through the voltage of the two ends of electric capacity output.
In other words, unlike the prior art, will only supply with reset circuit and microprocessor, and be used as the driving voltage of light-emitting diode with the direct voltage of a voltage stabilizing circuit output.
The course of action of high-frequency electronic food heater power circuit of the present invention is described below with reference to Fig. 2.
To the high-frequency electronic food heater supply power, when power supply is added to the primary side of transformer, output be directly proportional with the turn ratio of described Circuit Fault on Secondary Transformer post-decompression alternating voltage.
Through the alternating voltage of the terminal of described Circuit Fault on Secondary Transformer decompression through diode and electric capacity carries out rectification and the cunning that flattens after, be transformed to direct voltage.
That is,, carried out the direct voltage of halfwave rectifier to electric capacity output through described diode through the direct voltage that two diodes carried out full-wave rectification to electric capacity output.
Be used as the power supply of magnetron from the voltage of two capacitor C 15, C25 output, through the voltage input voltage stabilizing circuit of the two ends of described electric capacity output with relay.
Direct voltage after described voltage stabilizing circuit P30 improves outputs to electric capacity, through the direct voltage supply reset circuit RS20 of described electric capacity two ends output and the power supply terminal of described microprocessor, thus, the microprocessor action.
In addition, the direct voltage through described capacitor C 35 outputs is used as the input power supply that drives described light-emitting diode.
Therefore, when described microprocessor instructs light-emitting diode drives, just to the described transistorized base stage input instruction signal that is connected with described output end of microprocessor.
After described transistorized base stage was received signal, described transistor was connected, and the conducting collector and emitter is supplied with direct voltage to described light-emitting diode.
Described direct voltage makes described light-emitting diode begin to drive, and in addition, when described microprocessor stop signal, described transistor becomes closed condition, blocks power supply and supplies with, and described light-emitting diode stops to drive.
As mentioned above, the present invention can drive described microprocessor and light-emitting diode by a power circuit.
As mentioned above, high-frequency electronic food heater power circuit of the present invention is with power supply of microprocessor portion and the LED power source portion formation power supply unit that is combined into one, so formation and design aspect at circuit can simply constitute, reduce unnecessary number of elements, reduce fee of material, can constitute economic circuit.
In addition, integrated by power supply unit reduced the use side quantum count of transformer, can improve the efficient of transformer.
Claims (4)
1. the power circuit of a high-frequency electronic food heater, comprise: high-frequency electronic food heater cooking action control shows the light-emitting diode and the driven by magnetron relay of high-frequency electronic food heater operate condition with microprocessor, according to the action command of described microprocessor, it is characterized in that, also comprise:
Transformer with primary coil and two secondary coils; The the 1st to the 3rd diode, its end separately is connected with the link of two secondary coils of the described transformer that comprises a common connection end, and its other end separately is connected with other two terminals, to secondary output the carrying out rectification of described transformer; Connect the described the 1st and the 2nd diode, make the 1st electric capacity of the output smoothing of described the 1st diode; Be connected with described the 1st capacitances in series and be connected with the 3rd diode, so that the 2nd electric capacity of the described the 2nd and the 3rd diode output smoothing with the 2nd; Its input and earth terminal are connected on one the two ends in the described the 1st and the 2nd electric capacity and this electric capacity output are remained the voltage stabilizing circuit of certain level; Described circuit output end of pressure-stabilizing; Be connected and supply with the 3rd electric capacity of action power to described microprocessor and light-emitting diode with earth terminal.
2. the power circuit of high-frequency electronic food heater according to claim 1 is characterized in that: one in the secondary output of the described transformer of described the 1st diode pair is carried out halfwave rectifier.
3. the power circuit of high-frequency electronic food heater according to claim 1 is characterized in that: the described the 2nd and the secondary output of the described transformer of the 3rd diode pair in one carry out full-wave rectification.
4. the power circuit of high-frequency electronic food heater according to claim 1 is characterized in that: the voltage in the induction of the two ends of the described the 1st and the 2nd electric capacity drives with being supplied to as described relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01132841XA CN100358396C (en) | 2001-07-18 | 2001-07-18 | Power supply circuit for high-frequency electronic food heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01132841XA CN100358396C (en) | 2001-07-18 | 2001-07-18 | Power supply circuit for high-frequency electronic food heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1398144A CN1398144A (en) | 2003-02-19 |
| CN100358396C true CN100358396C (en) | 2007-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01132841XA Expired - Fee Related CN100358396C (en) | 2001-07-18 | 2001-07-18 | Power supply circuit for high-frequency electronic food heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100358396C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4281372A (en) * | 1979-10-22 | 1981-07-28 | General Electric Company | Power supply for magnetron and the like loads |
| US5003141A (en) * | 1988-10-14 | 1991-03-26 | U.S. Philips Corporation | Magnetron power supply with indirect sensing of magnetron current |
-
2001
- 2001-07-18 CN CNB01132841XA patent/CN100358396C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4281372A (en) * | 1979-10-22 | 1981-07-28 | General Electric Company | Power supply for magnetron and the like loads |
| US5003141A (en) * | 1988-10-14 | 1991-03-26 | U.S. Philips Corporation | Magnetron power supply with indirect sensing of magnetron current |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1398144A (en) | 2003-02-19 |
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Granted publication date: 20071226 |