CN107453608A - A kind of feedback circuit and micro-wave oven - Google Patents
A kind of feedback circuit and micro-wave oven Download PDFInfo
- Publication number
- CN107453608A CN107453608A CN201710896804.8A CN201710896804A CN107453608A CN 107453608 A CN107453608 A CN 107453608A CN 201710896804 A CN201710896804 A CN 201710896804A CN 107453608 A CN107453608 A CN 107453608A
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- China
- Prior art keywords
- voltage
- regulator diode
- feedback circuit
- circuit
- photo
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/26—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes without control electrode or semiconductor devices without control electrode to produce the intermediate ac
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/327—Means for protecting converters other than automatic disconnection against abnormal temperatures
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of feedback circuit and micro-wave oven, the feedback circuit includes：First voltage-regulator diode, the second voltage-regulator diode, photo-coupler and first resistor, wherein：The positive pole of first voltage-regulator diode and the positive pole of the input of photo-coupler and the second voltage-regulator diode connect, and the negative pole of the second voltage-regulator diode and one end of first resistor connect, the other end ground connection of first resistor.The acting in opposition that the feedback circuit of the present invention passes through two identical voltage-regulator diodes, first voltage-regulator diode and the second voltage-regulator diode are influenced by temperature identical, when making the electric current increase by the first voltage-regulator diode, also increase by the electric current of the second voltage-regulator diode, to ensure that the electric current by photo-coupler keeps constant, it is influenced by temperature so as to reach reduction feedback circuit output voltage, the output voltage for solving voltage-regulator diode changes with the change of environment temperature, the problem of easily causing main control integrated circuit or other circuit operation irregularities.
Description
Technical field
The present invention relates to intelligent electric appliance field, more particularly to a kind of feedback circuit and micro-wave oven.
Background technology
Micro-wave oven is to absorb microwave energy in microwave field using food and make the cooking apparatus of conducting self-heating.Microwave system
Either in startup and turn-off transient, still at work, very big interference can be produced, the normal work of electric-controlled plate is produced
Influence.Therefore, in the application of microwave oven electric-control board, as far as possible the use of reduction except master control micro-control unit (MCU,
Microcontroller Unit) beyond numeric class device, with reduce interference cause operation irregularity problem appearance it is general
Rate.
Microwave current stove electric-controlled plate uses power supply of the Switching Power Supply as electric-controlled plate, in inverse-excitation type switch power-supply circuit
In, the feedback circuit of output voltage is a critically important circuit, and it influences whether the precision of output voltage.Prior art is commonly used
Main element of the controllable accurate voltage stabilizing chip (TL431) as feedback circuit, because output voltage ratio of precision is higher, by temperature shadow
Sound is smaller, but when TL431 is applied in micro-wave oven product, can be easily caused output electricity by the radiation interference of microwave
Reduce off-flavor is normal.Another conventional feedback circuit of prior art is the main element using voltage-regulator diode as feedback circuit, is made
When doing feedback circuit with voltage-regulator diode, its anti-microwave interference ability is stronger, but due to space-charge region (PN junction,
Positive-Negative junction) characteristic, be influenced by temperature it is bigger, as the micro-wave oven working time adds
It is long, the operating ambient temperature rise (micro-wave oven highest environment temperature is 85 DEG C) of voltage-regulator diode, the output electricity of voltage-regulator diode
Pressure changes also with the change of environment temperature, easily causes main control integrated circuit or other circuit operation irregularities.
Therefore a kind of feedback circuit is needed, can effectively reduces influence of the temperature to output voltage, to solve in the prior art
The output voltage of voltage-regulator diode changes with the change of environment temperature in feedback circuit, easily cause main control integrated circuit or its
The problem of his circuit operation irregularity.
The content of the invention
The present invention provides a kind of feedback circuit and micro-wave oven, to solve voltage-regulator diode in feedback circuit in the prior art
Output voltage change with the change of environment temperature, easily cause asking for main control integrated circuit or other circuit operation irregularities
Topic.
In order to solve the above technical problems, on the one hand, the present invention provides a kind of feedback circuit, including：First voltage-regulator diode,
Second voltage-regulator diode, photo-coupler and first resistor, wherein：The positive pole of first voltage-regulator diode and the optical coupling
The positive pole of the input of device and the second voltage-regulator diode connects, negative pole and the first resistor of second voltage-regulator diode
One end connects, the other end ground connection of the first resistor.
Further, one end of the positive pole of first voltage-regulator diode and second resistance connect, the second resistance it is another
One end is connected with the input of the photo-coupler.
Further, first voltage-regulator diode is identical with the second voltage-regulator diode specification.
On the other hand, the present invention also provides a kind of micro-wave oven, comprises at least：Switching power circuit, wherein, the switch electricity
Source circuit includes：Primary side and secondary end, the primary side comprise at least power supply chip, and the secondary end comprises at least output electricity
Road, the micro-wave oven also include feedback circuit as claimed any one in claims 1 to 3, wherein, in the feedback circuit
The negative pole of one voltage-regulator diode is connected with the output circuit of switching power circuit secondary end, and the output end of the photo-coupler is with opening
The detection pin connection of the power supply chip of powered-down source circuit primary side.
Further, the first voltage-regulator diode in the feedback circuit and the second voltage-regulator diode are placed adjacent to ensure
The temperature environment for stating the first voltage-regulator diode and the second voltage-regulator diode is identical.
The feedback circuit of the present invention is by the acting in oppositions of two identical voltage-regulator diodes, the first voltage-regulator diode and the
Two voltage-regulator diodes be influenced by temperature it is identical, make by the first voltage-regulator diode electric current increase when, by the second voltage stabilizing two
The electric current of pole pipe also increases, and to ensure that the electric current by photo-coupler keeps constant, feedback circuit output electricity is reduced so as to reach
Pressure is influenced by temperature, and the output voltage for solving voltage-regulator diode changes with the change of environment temperature, easily causes master control
The problem of integrated circuit or other circuit operation irregularities.
Brief description of the drawings
Fig. 1 is the circuit diagram of feedback circuit in first embodiment of the invention；
Fig. 2 is the current trend figure of feedback circuit in first embodiment of the invention；
Fig. 3 is another circuit diagram of feedback circuit in first embodiment of the invention；
Fig. 4 is the switching power circuit of micro-wave oven and feedback circuit connection diagram in second embodiment of the invention.
Embodiment
Change to solve the output voltage of voltage-regulator diode in the prior art with the change of environment temperature, easily cause
The problem of main control integrated circuit or other circuit operation irregularities, the invention provides a kind of feedback circuit and micro-wave oven, tie below
Accompanying drawing and embodiment are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
Only to explain the present invention, the present invention is not limited.
The first embodiment of the present invention provides a kind of feedback circuit, and its circuit diagram is as shown in figure 1, feedback circuit mainly wraps
Include the first voltage-regulator diode Z1, the second voltage-regulator diode Z2, first resistor R1 and photo-coupler IC.Wherein, the first voltage stabilizing two
Pole pipe Z1 positive pole is connected with photo-coupler IC input and the second voltage-regulator diode Z2 positive pole, the second voltage-regulator diode Z2
Negative pole be connected with first resistor R1 one end, first resistor R1 other end ground connection.It will be appreciated that the pole of the first voltage stabilizing two
Pipe Z1 and the second voltage-regulator diode Z2 specification are identical, i.e., the two by temperature is influenceed caused by change it is also identical.
In actual use, feedback circuit by the output voltage of photo-coupler mainly by feeding back to its main circuit connected
In power supply chip or processor in, main circuit is judged the working condition of current main circuit according to output voltage and carry out real-time
Adjustment.When feedback circuit is connected, its internal current trend is as shown in Fig. 2 the first voltage-regulator diode Z1 negative pole connection electricity
Source (or output circuit in main circuit), input current I, then shunting, by two voltage-regulator diode Z2's and first resistor R1
Electric current is I1, and the electric current by photo-coupler IC is I2, and exports a stable output voltage from IC output end, is fed back to
Main circuit.First voltage-regulator diode and the second voltage-regulator diode Opposite direction connection, when being affected by temperature, its internal PN junction presented
Characteristic is identical, to caused by feedback circuit effect cancel each other, when I increase, I1 also increases, make I2 keep it is constant, reduction because
Influence caused by temperature exports on feedback circuit.
Further, the negative pole of the first voltage-regulator diode can also be connected with second resistance R2 one end, and second resistance
R2 other end ground connection, to play fine setting output voltage range effect, its circuit diagram is as shown in Figure 3., can be with actual use
The voltage range that output is actually needed according to feedback circuit determines the model of component, specification or resistance etc. in circuit, for example, the
The voltage loaded on one voltage-regulator diode Z1 and the second voltage-regulator diode Z2 is no more than 5V, can be preferably 4.8V, first resistor
R1 resistance can be 100 Ω, and the resistance of second resistance can be 330 Ω, printed circuit board that photo-coupler IC is used (PCB,
Printed Circuit Board) model can be PCB17.
The feedback circuit of the present embodiment by the acting in oppositions of two identical voltage-regulator diodes, the first voltage-regulator diode and
Second voltage-regulator diode be influenced by temperature it is identical, make by the first voltage-regulator diode electric current increase when, by the second voltage stabilizing
The electric current of diode also increases, and to ensure that the electric current by photo-coupler keeps constant, feedback circuit output is reduced so as to reach
Voltage is influenced by temperature, and the output voltage for solving voltage-regulator diode changes with the change of environment temperature, easily causes master
The problem of controlling integrated circuit or other circuit operation irregularities.
The second embodiment of the present invention provides a kind of micro-wave oven, and the micro-wave oven comprises at least：Switching power circuit, it is above-mentioned
Switching power circuit includes：Primary side and secondary end, primary side comprise at least power supply chip, and secondary end comprises at least output electricity
Road, also, the of the feedback circuit provided in the output circuit of the switching power circuit secondary end and first embodiment of the invention
The negative pole of one voltage-regulator diode is connected, and provides input current for feedback circuit, the output end of the photo-coupler of feedback circuit is with opening
The detection pin of the power supply chip of powered-down source circuit primary side is connected to receive the output voltage of feedback circuit.
Fig. 4 is the switching power circuit and feedback circuit connection diagram of micro-wave oven.Wherein, rectifier bridge BD1 4 pin connect
Ground, 2 pin connect the N lines into civil power, the L lines of 3 pin series connection insurance resistance RX access civil powers, 1 pin and electrochemical capacitor E100, electrolysis electricity
Hold E101, electric capacity C100, resistance R102 with transformer T100 1 pin to be connected, electrochemical capacitor the E100 other end and inductance L101
One end connect and be grounded, the inductance L101 other end and the electrochemical capacitor E101 other end, power supply chip 1,2,7,8 pin,
Electric capacity C102 one end connection, the electric capacity C100 other end are connected with resistance R111, resistance R101 one end, and resistance R111's is another
One end is connected with the resistance R102 other end, and the resistance R101 other end is connected with diode D102 negative pole, diode D102
Positive pole be connected with 5 pin of power supply chip, transformer T100 3 pin, transformer T100 6 pin ground connection, transformer T100 8 pin
It is connected with diode D107 positive pole, diode D107 negative pole and electrochemical capacitor E102 positive pole, voltage-regulator diode Z00
One end connection of the negative pole, inductance L100 of (equivalent to the first voltage-regulator diode of first embodiment of the invention), transformer T100
10 pin be connected with resistance R103 one end, diode D106 positive pole, diode D106 negative pole and resistance R106 one end
And 12V output ends are connected, the resistance R103 other end is connected with electric capacity C101 one end, the electric capacity C101 other end and electrolysis
Electric capacity E103 positive pole connection, electrochemical capacitor E103 negative pole ground connection, inductance the L100 other end and electrochemical capacitor E104 are just
Pole, 5V output ends are connected, and electrochemical capacitor E104 negative pole and the resistance R106 other end are grounded, and voltage-regulator diode Z00 is just
Pole is (suitable with voltage-regulator diode Z01 (equivalent to the second voltage-regulator diode of first embodiment of the invention) positive pole, resistance R105
In the second resistance of first embodiment of the invention) one end connection, voltage-regulator diode Z01 negative pole and resistance R121 (equivalent to
The first resistor of first embodiment of the invention) one end connection, resistance R121 the other end ground connection, the resistance R105 other end with
Photo-coupler IC101 (equivalent to the photo-coupler of first embodiment of the invention) 1 pin connection, photo-coupler IC101 2 pin with
Electrochemical capacitor E102 negative pole connection, photo-coupler IC101 3 pin and 4 pin of power supply chip connect, and the 4 of photo-coupler IC101
The other end connection of 3 pin of pin and power supply chip, electric capacity C102.It will be appreciated that a side of transformer is switch electricity
The primary side of source circuit, secondary side are secondary end, and CN100 is the power outlet that civil power provides in Fig. 4, its 5 pin, 7 pin and 9
Pin can connect other electrical equipment, such as light fixture, fan respectively, and transformer T100 4 pin and 5 pin are assists winding, become for eliminating
Depressor T100 triple-frequency harmonics, also, switching power circuit illustrated in fig. 4 is the preferred switch of one kind that the present embodiment uses
Power circuit, it is not limited in the switching power circuit shown in Fig. 4 during actual use.
When the temperature of the working environment of micro-wave oven changes, flow through voltage-regulator diode Z100 electric current increase or reduce, phase
Answer, because Z100 with Z101 specifications are identical and oppositely positioned, the electric current for flowing through voltage-regulator diode Z101 increases or subtracted accordingly
Small, the electric current for inputting photo-coupler IC100 is stable, and then the purpose of stable photo-coupler output voltage.To ensure
Z100 and Z101 is influenced by temperature identical, when carrying out PCB making, Z100 and Z101 is next to side by side, made as far as possible
The temperature environment of the two work is identical.
Although being example purpose, the preferred embodiments of the present invention are had been disclosed for, those skilled in the art will recognize
Various improvement, increase and substitution are also possible, and therefore, the scope of the present invention should be not limited to above-described embodiment.
Claims (5)
- A kind of 1. feedback circuit, it is characterised in that including：First voltage-regulator diode, the second voltage-regulator diode, photo-coupler and First resistor, wherein：The positive pole of first voltage-regulator diode and the input of the photo-coupler and the second voltage-regulator diode Positive pole connection, the negative pole of second voltage-regulator diode is connected with one end of the first resistor, the first resistor it is another One end is grounded.
- 2. feedback circuit as claimed in claim 1, it is characterised in that the positive pole and second resistance of first voltage-regulator diode One end connection, the other end of the second resistance is connected with the input of the photo-coupler.
- 3. feedback circuit as claimed in claim 1, it is characterised in that first voltage-regulator diode and the second voltage-regulator diode Specification is identical.
- 4. a kind of micro-wave oven, is comprised at least：Switching power circuit, wherein, the switching power circuit includes：Primary side and secondary End, the primary side comprise at least power supply chip, and the secondary end comprises at least output circuit, it is characterised in that the microwave Stove also includes feedback circuit as claimed any one in claims 1 to 3, wherein, the pole of the first voltage stabilizing two in the feedback circuit The negative pole of pipe is connected with the output circuit of switching power circuit secondary end, the output end and switching power circuit of the photo-coupler The detection pin connection of the power supply chip of primary side.
- 5. micro-wave oven as claimed in claim 4, it is characterised in that the first voltage-regulator diode and second in the feedback circuit Voltage-regulator diode is placed adjacent to ensure that the temperature environment of first voltage-regulator diode and the second voltage-regulator diode is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710896804.8A CN107453608A (en) | 2017-09-28 | 2017-09-28 | A kind of feedback circuit and micro-wave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710896804.8A CN107453608A (en) | 2017-09-28 | 2017-09-28 | A kind of feedback circuit and micro-wave oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107453608A true CN107453608A (en) | 2017-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710896804.8A Pending CN107453608A (en) | 2017-09-28 | 2017-09-28 | A kind of feedback circuit and micro-wave oven |
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| Country | Link |
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| CN (1) | CN107453608A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109445502A (en) * | 2018-12-24 | 2019-03-08 | 厦门能瑞康电子有限公司 | A kind of high-precision feed circuit |
Citations (4)
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| US4529845A (en) * | 1984-04-02 | 1985-07-16 | Gte Communication Systems Corporation | Optical coupling interface circuit for telephone line ringing signal indication or detection |
| JPS6481662A (en) * | 1987-09-22 | 1989-03-27 | Murata Manufacturing Co | Ringing choke converter of flyback system |
| CN102595675A (en) * | 2011-01-12 | 2012-07-18 | 亿光电子工业股份有限公司 | Lighting device and light emitting diode device thereof |
| CN206211501U (en) * | 2016-11-30 | 2017-05-31 | 广东金莱特电器股份有限公司 | A kind of locked protection circuit of new output overvoltage |
-
2017
- 2017-09-28 CN CN201710896804.8A patent/CN107453608A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4529845A (en) * | 1984-04-02 | 1985-07-16 | Gte Communication Systems Corporation | Optical coupling interface circuit for telephone line ringing signal indication or detection |
| JPS6481662A (en) * | 1987-09-22 | 1989-03-27 | Murata Manufacturing Co | Ringing choke converter of flyback system |
| CN102595675A (en) * | 2011-01-12 | 2012-07-18 | 亿光电子工业股份有限公司 | Lighting device and light emitting diode device thereof |
| CN206211501U (en) * | 2016-11-30 | 2017-05-31 | 广东金莱特电器股份有限公司 | A kind of locked protection circuit of new output overvoltage |
Non-Patent Citations (1)
| Title |
|---|
| 王水成: "稳压管的温度特性与温度补偿", 《电子家庭》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109445502A (en) * | 2018-12-24 | 2019-03-08 | 厦门能瑞康电子有限公司 | A kind of high-precision feed circuit |
| CN109445502B (en) * | 2018-12-24 | 2024-02-02 | 厦门能瑞康电子有限公司 | High-precision feedback circuit |
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Application publication date: 20171208 |