CN210328043U - Magnetic energy heating system with dry burning protection - Google Patents
Magnetic energy heating system with dry burning protection Download PDFInfo
- Publication number
- CN210328043U CN210328043U CN201921051771.8U CN201921051771U CN210328043U CN 210328043 U CN210328043 U CN 210328043U CN 201921051771 U CN201921051771 U CN 201921051771U CN 210328043 U CN210328043 U CN 210328043U
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- Prior art keywords
- circuit
- main control
- control chip
- electrically connected
- frequency
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000002463 transducing effect Effects 0.000 claims 1
- 230000006698 induction Effects 0.000 abstract description 18
- 230000026683 transduction Effects 0.000 abstract description 10
- 238000010361 transduction Methods 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 5
- 239000000523 sample Substances 0.000 abstract description 5
- 238000002485 combustion reaction Methods 0.000 description 7
- 230000000295 complement effect Effects 0.000 description 4
- 238000013021 overheating Methods 0.000 description 1
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Abstract
A magnetic energy heating system with dry burning protection comprises a full-bridge transduction circuit, a zero-crossing comparison circuit, a frequency tracking circuit, a main control chip and a drive generation circuit; the zero-crossing comparison circuit is electrically connected with the frequency tracking circuit, the frequency tracking circuit is respectively electrically connected with the main control chip and the drive generating circuit, the main control chip is electrically connected with the drive generating circuit, and the main control chip can be an STC16F32K128 or other 51 single-chip microcomputer. The utility model discloses an effective gain is: the dry burning protection of the system can be realized without an external probe, and the frequency tracking response is extremely quick, so that the system can quickly make the dry burning response and protect in time; the temperature rise of the magnetic core is judged by calculating the offset of the resonant frequency, so that misjudgment caused by initial slight difference of the parameters of the induction coil is avoided, the accuracy is improved, and the method can be widely applied to magnetic heating equipment such as a magnetic water heater, a magnetic wall-mounted furnace and the like.
Description
Technical Field
The utility model relates to a magnetic energy water heater field especially relates to a magnetic energy heating system of protection is burnt futilely in area.
Background
The existing magnetic energy water heater converts electric energy into heat energy through the heating body to realize the purpose of heating, because the heating magnetic core of the heating body is usually positioned in the center of the heating body, and the coil is externally wound after the heating magnetic core is isolated through the insulating layer, because the magnetic core is isolated from the outside and inconvenient to use the probe to detect the temperature of the magnetic core, when the whole machine is dried, the overheating of the magnetic core can damage the external insulating layer to cause water leakage, and the water leakage can cause unnecessary loss and cause safety problems. The inherent resonant frequency of the whole machine can be changed after the magnetic core of the heating element is subjected to high temperature, and the magnetic energy water heater is provided with a corresponding frequency tracking circuit, so that the frequency tracking circuit obtains the resonant frequency of the whole machine during dry burning, and the whole machine is closed when the frequency reaches a threshold value, and the dry burning and the timely shutdown protection are realized.
Disclosure of Invention
In order to solve the problem, the utility model provides a magnetic energy heating system of protection is burnt futilely in area can utilize its self frequency tracking circuit to realize the protection of burning futilely of magnetic energy water heater under the condition that need not to increase external probe.
A magnetic energy heating system with dry burning protection comprises a full-bridge energy conversion circuit (1), a zero-crossing comparison circuit (2), a frequency tracking circuit (3), a main control chip (4) and a drive generation circuit (5); the zero-crossing comparison circuit (2) is electrically connected with the frequency tracking circuit (3), the frequency tracking circuit (3) is respectively electrically connected with the main control chip (4) and the drive generation circuit (5), the main control chip (4) is electrically connected with the drive generation circuit (5), and the main control chip (4) can be an STC16F32K128 or other 51 single-chip microcomputer.
The current transformer collects current signals of an induction coil outside the heating body, the current signals are sent to the frequency tracking circuit (3) to track after passing through the zero-crossing comparison circuit (2), the result of the tracking is sent to the main control chip (4) and the drive generating circuit (5), and the drive generating circuit (5) synthesizes the drive signals according to the result of the frequency tracking circuit (3) to drive the magnetic energy transduction circuit to form closed-loop control.
The drive generation circuit (5) generates 4 paths of PWM drive signals which are complementary in pairs and are used for driving the full-bridge transduction circuit (1), wherein the SW1 is electrically connected with the Q1 in the full-bridge transduction circuit (1), the SW2 is electrically connected with the Q2, the SW3 is electrically connected with the Q3, and the SW4 is electrically connected with the Q4, so that the drive generation circuit (5) can drive the full-bridge transduction circuit (1) in a complementary mode to realize induction heating.
Further, the frequency tracking circuit (3) sends the tracking result to the main control chip (4) in a form of two times of a duty ratio wave with a resonant frequency of 50%, and the main control chip (4) obtains a specific frequency size through calculation.
Generally, when induction heating is carried out, the temperature of a load magnetic core rises before the Curie temperature, so that the inductance of an induction coil is increased, and after the Curie temperature is reached, the inductance is sharply reduced according to a resonant frequency calculation formula
It is known that the temperature increase inductance L will increase with the resonance capacitance C unchanged, resulting in a decrease in the resonance frequency F, so a decrease in the resonance frequency F during induction heating means an increase in the temperature of the magnetic core; approximately, the shift of the resonance frequency is proportional to the temperature rise of the core under the same initial conditions
。
Since the basic parameters of the induction coil are slightly different in different environments, the differences need to be avoided in order to ensure that the dry combustion protection system can accurately protect the induction coil, and therefore the system detects the offset of the basic resonance frequency and the current resonance frequency
To judge
Namely the temperature rise, the specific method is as follows:
temperature recording by running at low power for a short time just before heating
(it can be considered as room temperature due to short-time low power operation) at its resonant frequency
And then the main control chip (4) detects the frequency when the system normally runs
When is coming into contact with
When the threshold value is reached, the condition is considered
The temperature rise reaches the threshold value and needs dry burning protection, at the moment, the driving generating circuit (5) is closed through the main control chip (4) so as to close the magnetic energy transduction system to achieve the purpose of dry burning protection, and the threshold value is set through the main control chip (4) after being verified through tests, so that the accuracy of the threshold value is guaranteed.
The utility model discloses an effective gain is: the dry combustion protection of the system can be realized without an external probe, the frequency tracking self response is very fast, so that the system can quickly perform the dry combustion response and timely protect the system, the temperature rise of the magnetic core is judged by calculating the offset of the resonance frequency, the misjudgment caused by the initial slight difference of the parameters of the induction coil is avoided, the accuracy is improved, and the method can be widely applied to magnetic energy heating equipment such as a magnetic energy water heater, a magnetic energy wall-mounted furnace and the like.
Drawings
FIG. 1: curve of induction coil inductance with temperature
FIG. 2: curve of resonant frequency of system with temperature
FIG. 3: the structure of the heating system of the utility model is schematically illustrated
1. Full-bridge energy conversion circuit 2 and zero-crossing comparison circuit
3. Frequency tracking circuit 4 and main control chip
5. A drive generation circuit.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
according to fig. 1-3, a magnetic energy heating system with dry combustion protection comprises a full-bridge energy conversion circuit 1, a zero-crossing comparison circuit 2, a frequency tracking circuit 3, a main control chip 4 and a drive generation circuit 5, wherein the zero-crossing comparison circuit 2 is electrically connected with the frequency tracking circuit 3, the frequency tracking circuit 3 is electrically connected with the main control chip 4 and the drive generation circuit 5 respectively, the main control chip 4 is electrically connected with the drive generation circuit 5, and the main control chip 4 can be an STC16F32K128 or other 51 single-chip microcomputer.
The current transformer collects current signals of an induction coil outside the heating body, the current signals are sent to the frequency tracking circuit 3 to be tracked after passing through the zero-crossing comparison circuit 2, the result of the tracking is sent to the main control chip 4 and the drive generating circuit 5, and the drive generating circuit 5 synthesizes drive signals according to the result of the frequency tracking circuit 3 to drive the magnetic energy transduction circuit to form closed-loop control.
The driving generation circuit 5 generates 4 pairs of PWM driving signals which are complementary to each other and are used for driving the full-bridge transduction circuit 1, wherein the SW1 is electrically connected with the Q1 in the full-bridge transduction circuit 1, the SW2 is electrically connected with the Q2, the SW3 is electrically connected with the Q3, and the SW4 is electrically connected with the Q4, so that the driving generation circuit 5 can drive the full-bridge transduction circuit 1 in a complementary mode to realize induction heating.
Further, the frequency tracking circuit 3 transmits the tracking result to the main control chip 4 in the form of a duty ratio wave of 50% at twice the resonance frequency, and the main control chip 4 calculates a specific frequency magnitude.
Generally, when induction heating is carried out, the temperature of a load magnetic core rises before the Curie temperature, so that the inductance of an induction coil is increased, and after the Curie temperature is reached, the inductance is sharply reduced according to a resonant frequency calculation formula
It is known that the temperature increase inductance L will increase with the resonance capacitance C unchanged, resulting in a decrease in the resonance frequency F, so a decrease in the resonance frequency F during induction heating means an increase in the temperature of the magnetic core; approximately, the shift of the resonance frequency is proportional to the temperature rise of the core under the same initial conditions
。
Since the basic parameters of the induction coil are slightly different in different environments, the differences need to be avoided in order to ensure that the dry combustion protection system can accurately protect the induction coil, and therefore the system detects the offset of the basic resonance frequency and the current resonance frequency
To judge
Namely the temperature rise, the specific method is as follows:
running at a lower power for a brief period of time just before heating is recorded at temperature
(it can be considered as room temperature due to short-time low power operation) at its resonant frequency
The main control chip 4 detects in normal operation
Frequency at temperature
When is coming into contact with
When the threshold value is reached, the condition is considered
The temperature rise reaches the threshold value and needs dry burning protection, at the moment, the driving generating circuit 5 is closed through the main control chip 4, and then the magnetic energy conversion system is closed so as to achieve the purpose of dry burning protection, and the threshold value is set through the main control chip 4 after being verified through tests, so that the accuracy of the threshold value is ensured.
The utility model discloses an effective gain is: the dry combustion protection of the system can be realized without an external probe, the frequency tracking self response is very fast, so that the system can quickly perform the dry combustion response and timely protect the system, the temperature rise of the magnetic core is judged by calculating the offset of the resonance frequency, the misjudgment caused by the initial slight difference of the parameters of the induction coil is avoided, the accuracy is improved, and the method can be widely applied to magnetic energy heating equipment such as a magnetic energy water heater, a magnetic energy wall-mounted furnace and the like.
Claims (2)
1. The utility model provides a magnetic energy heating system of protection is burnt futilely in area, includes full-bridge transducing circuit (1), zero passage comparison circuit (2), frequency tracking circuit (3), main control chip (4), drive generating circuit (5), its characterized in that: the zero-crossing comparison circuit (2) is electrically connected with the frequency tracking circuit (3), the frequency tracking circuit (3) is electrically connected with the main control chip (4) and the drive generating circuit (5) respectively, the main control chip (4) is electrically connected with the drive generating circuit (5), and the main control chip (4) judges the temperature rise of the magnetic core by calculating the resonance frequency obtained by the frequency tracking circuit (3) and the offset of the basic resonance frequency to realize the magnetic energy heating dry burning protection.
2. A magnetic energy heating system with dry-fire protection as claimed in claim 1, wherein: the system is operated at a lower power for a brief period of time to record the temperature just after heating
At its fundamental resonance frequency
And then the main control chip (4) detects the frequency when the system normally runs
When is coming into contact with
When the threshold value is reached, the condition is considered
When the temperature rise reaches the threshold value, dry burning protection is needed, and at the moment, the driving generating circuit (5) is closed through the main control chip (4) so as to close the magnetic energy conversion system to achieve the purpose of dry burning protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921051771.8U CN210328043U (en) | 2019-07-08 | 2019-07-08 | Magnetic energy heating system with dry burning protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921051771.8U CN210328043U (en) | 2019-07-08 | 2019-07-08 | Magnetic energy heating system with dry burning protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210328043U true CN210328043U (en) | 2020-04-14 |
Family
ID=70149199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921051771.8U Expired - Fee Related CN210328043U (en) | 2019-07-08 | 2019-07-08 | Magnetic energy heating system with dry burning protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210328043U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113747619A (en) * | 2020-05-29 | 2021-12-03 | 佛山市顺德区美的电热电器制造有限公司 | Control method and control device of cooking appliance, cooking appliance and storage medium |
| CN113747618A (en) * | 2020-05-29 | 2021-12-03 | 佛山市顺德区美的电热电器制造有限公司 | Control method of cooking apparatus, and computer-readable storage medium |
| CN113741228A (en) * | 2020-05-29 | 2021-12-03 | 佛山市顺德区美的电热电器制造有限公司 | Control method of cooking appliance, cooking appliance and computer readable storage medium |
| CN113741227A (en) * | 2020-05-29 | 2021-12-03 | 佛山市顺德区美的电热电器制造有限公司 | Control method and control device of cooking equipment, cooking equipment and storage medium |
-
2019
- 2019-07-08 CN CN201921051771.8U patent/CN210328043U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113747619A (en) * | 2020-05-29 | 2021-12-03 | 佛山市顺德区美的电热电器制造有限公司 | Control method and control device of cooking appliance, cooking appliance and storage medium |
| CN113747618A (en) * | 2020-05-29 | 2021-12-03 | 佛山市顺德区美的电热电器制造有限公司 | Control method of cooking apparatus, and computer-readable storage medium |
| CN113741228A (en) * | 2020-05-29 | 2021-12-03 | 佛山市顺德区美的电热电器制造有限公司 | Control method of cooking appliance, cooking appliance and computer readable storage medium |
| CN113741227A (en) * | 2020-05-29 | 2021-12-03 | 佛山市顺德区美的电热电器制造有限公司 | Control method and control device of cooking equipment, cooking equipment and storage medium |
| CN113741227B (en) * | 2020-05-29 | 2023-08-29 | 佛山市顺德区美的电热电器制造有限公司 | Control method and control device of cooking equipment, cooking equipment and storage medium |
| CN113747618B (en) * | 2020-05-29 | 2024-01-09 | 佛山市顺德区美的电热电器制造有限公司 | Control method of cooking apparatus, and computer-readable storage medium |
| CN113747619B (en) * | 2020-05-29 | 2024-05-17 | 佛山市顺德区美的电热电器制造有限公司 | Control method and control device for cooking appliance, cooking appliance and storage medium |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200414 |
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| CF01 | Termination of patent right due to non-payment of annual fee |