CN216596042U - Heating control circuit and breathing machine - Google Patents
Heating control circuit and breathing machine Download PDFInfo
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- CN216596042U CN216596042U CN202123441555.4U CN202123441555U CN216596042U CN 216596042 U CN216596042 U CN 216596042U CN 202123441555 U CN202123441555 U CN 202123441555U CN 216596042 U CN216596042 U CN 216596042U
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 109
- 230000029058 respiratory gaseous exchange Effects 0.000 title abstract description 7
- 230000006978 adaptation Effects 0.000 claims abstract description 8
- 238000002955 isolation Methods 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 4
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Abstract
The embodiment of the utility model provides a heating control circuit and breathing machine belongs to electronic circuit technical field. The heating control circuit comprises a control device and a switch device, wherein the input end of the control device is connected with an alternating current power supply, the output end of the control device is connected with the control end of the switch device, and the output end of the switch device is connected with the heating element; wherein the control device is configured to generate a drive signal for controlling duty cycle adaptation of the switching device in dependence on different output voltages of the ac power source, wherein the duty cycle adaptation is varied such that the power output by the switching device to the heating element is maintained constant. The utility model discloses a heating control circuit lug connection realizes heating member constant power output on different alternating current voltage's alternating current power supply.
Description
Technical Field
The utility model relates to an electronic circuit technical field specifically relates to a heating control circuit and breathing machine.
Background
In the prior art, constant power heating needs to be realized for the heating plate. However, the heating plate is sold in different countries, and the external alternating voltage is different. For example, the grid power used in some countries is 110V, and the grid power used in some countries is 220V. The existing heating circuit for the heating plate realizes constant power by directly detecting the zero crossing point or the duty ratio of the grid power supply by assuming a known voltage. However, when the voltage of the external network power supply changes, the calculated constant power is often inaccurate, and the heating circuit and the heating plate are damaged to a certain extent.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a heating control circuit and breathing machine, this heating control circuit can solve the technical problem that the above-mentioned exists at least.
In order to achieve the above object, in a first aspect, the embodiments of the present invention provide a heating control circuit, which includes a control device and a switch device, wherein an input end of the control device is connected to an ac power supply, an output end of the control device is connected to a control end of the switch device, and an output end of the switch device is connected to a heating element; wherein the control device is configured to generate a drive signal for controlling duty cycle adaptation of the switching device in dependence on different output voltages of the ac power source, wherein the duty cycle adaptation is varied such that the power output by the switching device to the heating element is maintained constant.
Optionally, the switching device is an MOS transistor, a gate of the MOS transistor is connected to the control device, a source is connected to the power ground terminal, and a drain is connected to the input end of the heating member, wherein the gate of the MOS transistor is the control end.
Optionally, the heating control circuit further includes a voltage divider circuit connected in parallel to a series circuit formed by the heating element and the switching device, and the voltage divider circuit includes a first resistor and a second resistor connected in series with each other.
Optionally, the heating control circuit further comprises an isolation device disposed between the output terminal of the control device and the control terminal of the switching device.
Optionally, the heating control circuit further includes a third resistor disposed between the isolation device and the switching device.
Optionally, the heating control circuit further comprises a rectifier device connected between the ac power supply and the heating element for converting an output voltage signal of the ac power supply into a dc voltage to be supplied to the heating element.
Optionally, the heating control circuit further comprises a transformer, connected between the ac power supply and the control device, for sampling an output voltage signal of the ac power supply to be provided to the control device.
Optionally, the voltage acquisition device is a mutual inductor, an input end of the mutual inductor is connected with the alternating current power supply, and an output end of the mutual inductor is connected with an input end of the control device.
Optionally, the control device is a power calculating chip.
In a second aspect, an embodiment of the present invention provides a ventilator, including: a heating element; and the heating control circuit of any one of the first aspect.
Through the technical scheme, the utility model discloses a heating control circuit can external different alternating current voltage's alternating current power supply to realize the constant power output of heating member, and its simple structure.
Other features and advantages of embodiments of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention, but do not constitute a limitation of the embodiments of the invention. In the drawings:
FIG. 1 is a schematic block diagram of a heating control circuit according to an exemplary embodiment;
FIG. 2 is a schematic diagram illustrating a heating control circuit connection according to an exemplary embodiment;
FIG. 3 is a schematic diagram illustrating a 110V AC voltage signal variation according to an exemplary embodiment;
FIG. 4 is a schematic diagram illustrating a 220V AC voltage signal variation according to an exemplary embodiment.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description herein is only intended to illustrate and explain embodiments of the present invention, and is not intended to limit embodiments of the present invention.
Fig. 1 is a schematic block diagram of a heating control circuit according to an exemplary embodiment, where the heating control circuit includes a control device 110 and a switching device 120, an input terminal of the control device 110 is connected to an ac power source, an output terminal of the control device 110 is connected to a control terminal of the switching device 120, and an output terminal of the switching device 120 is connected to a heating element; wherein the control device 110 is configured to generate a drive signal for controlling the duty cycle adaptation of the switching device 120 according to different output voltages of the ac power source, wherein the duty cycle adaptation is varied such that the power output by the switching device to the heating element is maintained constant.
The embodiment of the utility model provides a heating control circuit, alternating current power supply that can external different alternating voltage realizes the constant power heating of heating member, and simple structure, and the cost is lower.
In a preferred embodiment, the switching device is an MOS transistor, a gate of the MOS transistor is connected to the control device, a source of the MOS transistor is connected to a power ground, and a drain of the MOS transistor is connected to the input terminal of the heating element, where the gate of the MOS transistor is the control terminal.
For example, the MOS transistor can be adaptively turned on and off in response to a driving signal of the control device based on the basic operation principle of forward turning on and reverse turning off. Specifically, when the MOS transistor is in an on state, the heating member connected thereto starts the heating operation, and when the MOS transistor is in an off state, the heating member connected thereto stops the heating operation. Therefore, the MOS tube is switched on and off regularly in a certain period, so that the heating element is in constant power output in the certain period.
The switch device is an MOS tube, the grid electrode of the MOS tube is connected with the control device, the source electrode is connected with the power grounding end, the drain electrode is connected with the input end of the heating element, and the grid electrode of the MOS tube is the control end.
According to the embodiment of the application, different types of MOS tubes such as an N channel and a P channel can be selected according to actual needs, and the limitation is not excessive.
In a preferred embodiment, the heating control circuit further includes a voltage dividing circuit connected in parallel to a series circuit formed by the heating element and the switching device, and the voltage dividing circuit includes a first resistor and a second resistor connected in series with each other.
The bleeder circuit that first resistance and second resistance series connection formed can effectual control shunt voltage, prevents that too high voltage from puncturing the MOS pipe, avoids the damage of heating member. In addition, the resistance values of the first resistor and the second resistor can be set according to the practical application condition of the circuit, and the types of the first resistor and the second resistor are not limited. For example, the first resistor and the second resistor can adopt a sliding rheostat, and the control adjustment of the shunt voltage is realized by changing the size of the resistors.
In a preferred embodiment, the heating control circuit further comprises an isolation device disposed between the output terminal of the control device and the control terminal of the switching device.
Particularly, the isolation device effectively isolates input and output, prevents interference signals from influencing a circuit and has good electrical insulation capability. For example, the isolation device may employ a photoelectric coupler, such as a photoelectric coupler model number MOC 3063.
In a preferred embodiment, the heating control circuit further comprises a third resistor disposed between the isolation device and the switching device.
Specifically, the third resistor can play a current limiting role in the signal current output by the isolation device, effectively protect the switch unit and prevent the damage of the switch unit caused by the overhigh current.
In a preferred embodiment, the heating control circuit further includes a rectifier device connected between the ac power supply and the heating member for converting an output voltage signal of the ac power supply into a dc voltage to be supplied to the heating member.
This application embodiment converts alternating voltage into DC voltage through rectifier unit, can satisfy the heating member to DC voltage's needs. More preferably, this application embodiment can also set up the filter device between voltage conversion device and heating and establish the piece, and the direct current voltage signal after will converting filters, effectively gets rid of the interference signal in the direct current voltage signal, guarantees the safety in utilization of heating member.
The rectifier device may adopt a full-wave rectifier bridge, a half-wave rectifier bridge or other types of rectifier circuits according to actual application requirements, and is not limited herein.
In a preferred embodiment, the heating control circuit further comprises a voltage sampling device connected between the ac power source and the control device for sampling an output voltage signal of the ac power source to be supplied to the control device.
In a preferred embodiment, the voltage collecting device is a transformer, an input end of the transformer is connected to the ac power supply, and an output end of the transformer is connected to an input end of the control device. The alternating voltage can be reduced according to a certain proportion, so that the use of a control device is met.
In a preferred embodiment, the control device is a power calculating chip. Different power calculation formulas can be built in the power calculation chip according to the actual application requirements, so that various requirements of users on constant power output are met. For example, the model of the computing power chip includes HLW8012 and the like.
According to the embodiment, the heating control circuit can be externally connected with the alternating current power supplies with different alternating current voltages, and the requirement of wide voltage is further met on the basis of realizing constant power, so that the heating control circuit can adapt to different application occasions.
The process of achieving constant power output by the heating control circuit is described in more detail in the following embodiments.
FIG. 2 is a schematic diagram illustrating a heating control circuit connection according to an exemplary embodiment. The connections of the various units and devices in fig. 2 will first be briefly described. As shown in fig. 2, the rectifier bridge D1 includes an AC voltage input AC for connection to an AC power source J1. The positive output terminal 1 of the rectifier bridge D1 is connected to the input terminal 1 of the heating element. One input end of the transformer L1 is connected with an alternating current power supply J1, and the other input end is connected with a power supply grounding end GNDP. One output end of the mutual inductor is connected with an input end VIN of the calculation power chip U2, and the other output end of the mutual inductor is connected with a common grounding end. An input end 1 of the photoelectric coupler U1 is connected with an output end VOUT of the computing power chip U2, an output end 4 is connected with a grid electrode of the MOS tube through a third resistor R3, and an output end 6 is connected between a first resistor R1 and a second resistor R2 in the voltage division circuit. One end of the first resistor R1 is connected to the input terminal 1 of the heating element, and one end of the second resistor R2 is connected to the source of the MOS transistor and to the power ground GNDP. The drain electrode of the MOS transistor is connected to the input terminal 2 of the heating element.
The working process of the heating control circuit is as follows:
firstly, when the heating control circuit is connected with an alternating current power supply, the rectifier bridge converts an alternating current voltage signal of the alternating current power supply into a direct current voltage and outputs the direct current voltage to the heating element. The mutual inductor collects the alternating voltage of the alternating current power supply and transmits the collected voltage to the power calculation chip, so that the power calculation chip can calculate the power according to the collected voltage.
Secondly, according to the output requirement of the application on the constant power of the heating element, a power calculation formula arranged in the power chip is calculated. The output power of the alternating voltage is calculated by adopting an integral operation mode. And the power judgment condition is also arranged in the calculation power chip, and whether the output power exceeds a preset power threshold value is judged, wherein the power threshold value is the preset adaptive power of the heating element.
Specifically, referring to fig. 3 and 4, fig. 3 and 4 are a 110V ac voltage schematic diagram and a 220V ac voltage schematic diagram, respectively. The following 110V AC voltage and powerThe threshold value is 200W for example, and when the computing power chip detects the zero crossing point of the alternating voltage, the computing power of the alternating voltage is started. And (3) as time goes on, the alternating voltage rises, and the power chip calculates the power corresponding to the collected voltage value at a certain moment and carries out integral operation to obtain the output power at the moment. As shown in fig. 3, the output power integrated at the voltage V1 corresponding to the time T1 is 200W. In fig. 4, since the voltage rising speed of the 220V ac voltage is faster than that of the 110V ac voltage at the same time as compared with that of the 110V ac voltage, the output power integrated at the voltage V2 corresponding to the time T2 in fig. 4 is 200W, and T2 is T2<T1. Based on the power calculation formula W ═ U2It can be seen that if 110V is 100% output, the same power output as 110V can be achieved by outputting 25% output with 220V voltage. Taking fig. 3 and 4 as an example, the white area in fig. 3 is the same as the white area in fig. 4, and the white area in fig. 4 occupies 1/4 of the semicircular area formed by the half cycle of the 220V ac power.
Further, when the power calculating chip judges that the output power does not exceed the power threshold, the output driving signal is a starting signal. The photoelectric coupler outputs a corresponding output signal according to the starting signal, so that the MOS tube is conducted. At this time, the heating control circuit and the heating member form a closed loop, and the heating member is heated. And when the computing power chip judges that the output power exceeds the power threshold, the generated driving signal is a closing signal. The photoelectric coupler outputs a corresponding output signal after receiving a closing signal based on a photoelectric coupling principle, so that the MOS tube is in a cut-off state. At this point, the closed loop formed is open and the heating element ceases to continue heating.
Therefore, the constant power output of the heating element is realized by controlling the on-time and the off-time of the MOS tube, namely controlling the duty ratio of the MOS tube.
In addition, the closing signal output by the power calculating chip is a slow closing process for the MOS transistor, and compared with a fast process, the EMI of the circuit can be effectively reduced, and the influence of an interference signal generated by fast closing on other devices of the circuit is avoided.
In summary, the heating control circuit of the embodiment of the present application has the following advantages: 1) the circuit structure is simple and easy to apply; 2) the device can be externally connected with alternating current power supplies with different alternating current voltages, meets the requirement of wide voltage, and is suitable for different alternating current power supply occasions; 3) voltage reduction operation is not needed, and cost is saved; 4) the constant power output of the heating element is realized, and the use safety of the heating element is improved.
The embodiment of the utility model provides a still provide a breathing machine, this breathing machine includes: a heating member; and the heating control circuit of the above embodiment. The heating control circuit controls the output power of the heating element, so that the heating element can perform heating work in a constant power mode. The heating element is preferably a heating plate.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A heating control circuit is characterized by comprising a control device and a switch device, wherein the input end of the control device is connected with an alternating current power supply, the output end of the control device is connected with the control end of the switch device, and the output end of the switch device is connected with a heating element;
wherein the control device is configured to generate a drive signal for controlling duty cycle adaptation of the switching device in dependence on different output voltages of the ac power source, wherein the duty cycle adaptation is varied such that the power output by the switching device to the heating element is maintained constant.
2. The heating control circuit according to claim 1, wherein the switching device is a MOS transistor,
the grid of MOS pipe is connected the control device, and the source electrode is connected power earthing terminal, and the drain electrode is connected the input of heating member, wherein the grid of MOS pipe is the control end.
3. The heating control circuit according to claim 1, further comprising a voltage dividing circuit connected in parallel to a series circuit formed by the heating element and the switching device, and the voltage dividing circuit includes a first resistor and a second resistor connected in series with each other.
4. The heating control circuit of claim 1, further comprising an isolation device disposed between the output of the control device and the control terminal of the switching device.
5. The heating control circuit of claim 4 further comprising a third resistor disposed between the isolation device and the switching device.
6. The heating control circuit according to claim 1, characterized in that the heating control circuit further comprises a rectifier device connected between the ac power supply and the heating member for converting an output voltage signal of the ac power supply into a dc voltage to be supplied to the heating member.
7. The heating control circuit of claim 1 further comprising a voltage acquisition device connected between the ac power source and the control device for sampling an output voltage signal of the ac power source for provision to the control device.
8. The heating control circuit of claim 7, wherein the voltage acquisition device is a transformer,
the input end of the mutual inductor is connected with the alternating current power supply, and the output end of the mutual inductor is connected with the input end of the control device.
9. A heating control circuit according to any of claims 1 to 8 wherein the control device is a power computing chip.
10. A ventilator, comprising:
a heating member; and
a heating control circuit as claimed in any one of claims 1 to 9.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123441555.4U CN216596042U (en) | 2021-12-31 | 2021-12-31 | Heating control circuit and breathing machine |
| EP22914687.3A EP4428649A4 (en) | 2021-12-31 | 2022-12-26 | HEATING CONTROL CIRCUIT AND BREATHING MACHINE |
| PCT/CN2022/142002 WO2023125433A2 (en) | 2021-12-31 | 2022-12-26 | Heating control circuit and breathing machine |
| US18/718,465 US20250050051A1 (en) | 2021-12-31 | 2022-12-26 | Heating control circuit and ventilator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123441555.4U CN216596042U (en) | 2021-12-31 | 2021-12-31 | Heating control circuit and breathing machine |
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| CN216596042U true CN216596042U (en) | 2022-05-24 |
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| CN202123441555.4U Active CN216596042U (en) | 2021-12-31 | 2021-12-31 | Heating control circuit and breathing machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023125433A3 (en) * | 2021-12-31 | 2023-08-24 | 天津怡和嘉业医疗科技有限公司 | Heating control circuit and breathing machine |
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- 2021-12-31 CN CN202123441555.4U patent/CN216596042U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023125433A3 (en) * | 2021-12-31 | 2023-08-24 | 天津怡和嘉业医疗科技有限公司 | Heating control circuit and breathing machine |
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