CN109246859A - A kind of method for heating and controlling and device - Google Patents
A kind of method for heating and controlling and device Download PDFInfo
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- CN109246859A CN109246859A CN201811051803.4A CN201811051803A CN109246859A CN 109246859 A CN109246859 A CN 109246859A CN 201811051803 A CN201811051803 A CN 201811051803A CN 109246859 A CN109246859 A CN 109246859A
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- bridge
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- switch
- heating
- pwm signal
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0236—Industrial applications for vehicles
Abstract
The embodiment of the present application discloses a kind of method for heating and controlling and device, is applied to heating control system；The heating control system, including the heating branch in parallel of at least one switch on the bridge pipe and at least 2；The heating branch includes concatenated bridge switch pipe and heating element；Heating branch and switch on the bridge pipe after parallel connection are connected between the positive and negative anodes of power supply；This method comprises: exporting the first pwm signal for controlling bridge switch pipe, at least one bridge switch pipe is controlled with open-minded with the prefixed time interval less than the first pwm signal period；The second pwm signal for controlling switch on the bridge pipe is exported, is turned on and off with controlling switch on the bridge pipe；Period of the period of second pwm signal less than the first pwm signal.This method can be realized electric heating function.
Description
This application claims in submission on June 22nd, 2018 Patent Office of the People's Republic of China, application No. is 201810654321.1, application name
This is hereby incorporated by reference in the referred to as priority of the Chinese patent application of " a kind of method for heating and controlling and device ", entire contents
In application.
Technical field
This application involves electric-heating technology field more particularly to a kind of method for heating and controlling and device.
Background technique
With the development of society, the sales volume of automobile is increasing, consequent is the scarcity and vapour of global energy
Environmental pollution caused by the discharge of tail gas.It is advocated the epoch of energy-saving and emission-reduction, environmental protection in country, the exploitation of new-energy automobile is compeled
In the eyebrows and eyelashes.New-energy automobile is following developing direction, the common recognition that the development of global new-energy automobile has been formed, new energy vapour
A series of components on vehicle are all in further research and development optimization.Electric heater on new-energy automobile (such as electric car) is also
Its important building block, the control for new-energy automobile electric heater are also concerned by people.
Summary of the invention
In view of this, the embodiment of the present application provides a kind of method for heating and controlling and device, electric heating function is realized.
A kind of method for heating and controlling provided by the embodiments of the present application is applied to heating control system；The computer heating control system
System, including the heating branch in parallel of at least one switch on the bridge pipe and at least 2；
The heating branch includes concatenated bridge switch pipe and heating element；
Heating branch and the switch on the bridge pipe after parallel connection are connected between the positive and negative anodes of power supply；
The method, comprising:
The first pwm signal for controlling the bridge switch pipe is exported, with prefixed time interval selection control at least one
A bridge switch pipe is open-minded；The prefixed time interval is less than the period of first pwm signal；
The second pwm signal for controlling the switch on the bridge pipe is exported, opens and closes to control the switch on the bridge pipe
It is disconnected；
The period of second pwm signal is less than the period of first pwm signal.
A kind of heating control apparatus provided by the embodiments of the present application is applied to heating control system；The computer heating control system
System, comprising: at least one switch on the bridge pipe and at least 2 heating branches in parallel；
The heating branch includes concatenated bridge switch pipe and heating element；
Heating branch and the switch on the bridge pipe after parallel connection are connected between the positive and negative anodes of power supply；
Described device, comprising: lower bridge control module and upper bridge control module；
The lower bridge control module, for exporting the first pwm signal for controlling the bridge switch pipe, when presetting
Between interval selection control at least one described bridge switch pipe it is open-minded；The prefixed time interval is less than first pwm signal
Period；
The upper bridge control module, for exporting the second pwm signal for controlling the switch on the bridge pipe, to control
Switch on the bridge pipe is stated to turn on and off；
The period of second pwm signal is less than the period of first pwm signal.
The application has at least the following advantages:
The embodiment of the present application is applied to the heating control including at least one switch on the bridge pipe and a plurality of heating branch in parallel
System processed.Every heating branch includes concatenated bridge switch pipe and heating element；A plurality of heating branch after parallel connection
It is connected between the positive and negative anodes of power supply with the switch on the bridge pipe.In control, export for controlling bridge switch pipe
First pwm signal and the second pwm signal for controlling switch on the bridge pipe, control switch on the bridge pipe are switched on or off, and with pre-
If it is open-minded that time interval selection controls at least one bridge switch pipe, to realize electric heating function.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to the required attached drawing of embodiment
It is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments as described in this application, for this
For the those of ordinary skill of field, without creative efforts, it can also be obtained according to these attached drawings others
Attached drawing.
Fig. 1 a is a kind of schematic diagram of heating control system in the embodiment of the present application；
Fig. 1 b is the schematic diagram of another heating control system in the embodiment of the present application；
Fig. 2 is a kind of flow diagram of method for heating and controlling provided by the embodiments of the present application；
Fig. 3 is a kind of circuit topology of specific heating control system provided by the embodiments of the present application；
Fig. 4 is a kind of signal timing diagram that the application specific embodiment provides；
Fig. 5 is the flow diagram of another method for heating and controlling provided by the embodiments of the present application；
Fig. 6 is a kind of structural schematic diagram of heating control apparatus provided by the embodiments of the present application；
Fig. 7 is the structural schematic diagram of another heating control apparatus provided by the embodiments of the present application.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only this
Apply for a part of the embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall in the protection scope of this application.
In order to make it easy to understand, first below to the application scenarios of method for heating and controlling provided by the embodiments of the present application and device
It is described in detail.
Method for heating and controlling and device provided by the embodiments of the present application are applied to control electric heater (constant temperature on such as automobile
The electric heater of heat cycles water) work heating control system.The heating control system, including at least one switch on the bridge pipe
At least 2 heating branches in parallel；
Heating branch and switch on the bridge pipe after parallel connection are connected between the positive and negative anodes of power supply；
Heating branch includes the bridge switch pipe and heating element (such as heater strip, heater) being connected in series.Upper bridge is opened
It closes pipe and bridge switch pipe all can be the controlled tr tube such as IGBT, metal-oxide-semiconductor.
In practical applications, which at least has the possible design of following two.Below with a upper bridge
It is illustrated for switching tube and three heating branches, other situations are similar, referring specifically to related description, here not
It repeats one by one again.
The first possible design, as shown in Figure 1a, a kind of illustrated heating control system of the figure.
The heating system, including the heating branch in parallel of switch on the bridge pipe Ku and three: heating branch 10, heating branch 20
With heating branch 30；
Heat branch 10, heating branch 20 and heating branch 30 respectively include: concatenated bridge switch pipe Kd1 and heating unit
Part H1, concatenated bridge switch pipe Kd2 and heating element H2, concatenated bridge switch pipe Kd2 and heating element H2；
After heating branch 10,20 and 30 parallel connections, the positive DC+ and cathode of power supply are connected on switch on the bridge pipe Ku
Between DC-.
Second possible design, as shown in Figure 1 b, the illustrated another heating control system of the figure.
The heating system, including the heating branch in parallel of switch on the bridge pipe Ku1 and two: heating branch 10 and heating branch
20；
Heat branch 10 and 20 respectively include: concatenated bridge switch pipe Kd1 and heating element H1, concatenated bridge switch
Pipe Kd2 and heating element H2；
Heat branch 10 and heating 20 parallel connection of branch after, with switch on the bridge pipe Ku1 be connected on power supply positive DC+ and
Between cathode DC-；
The system, further includes: heating branch 30 and switch on the bridge pipe Ku2；Heating branch 30 includes concatenated bridge switch
Pipe Kd3 and heating element H3；
Heating branch 30 and switch on the bridge pipe Ku2 are connected between the positive DC+ of power supply and cathode DC-.
Currently, there is a kind of electric heater of electric car to use 6 insulated gate bipolar transistor (insulated gate
Bipolar transistor, IGBT) heater is controlled, and using fixed frequency or the control mode of duty ratio, control
IGBT's processed cut-offs to control the control that heater is realized in heating element work, and still, the working frequency of 6 IGBT is identical, no
The disconnected IGBT that cut-offs influences its service life, is unfavorable for the use of electric heater.
And the embodiment of the present application provides a kind of method for heating and controlling and device, in a control period, between certain
Every controlling, at least one bridge switch pipe is open-minded, reduces the open and close times of bridge switch pipe, ensure that the service life of switching tube, into
And improve the service life of electric heater.
Based on above-mentioned thought, in order to make the above objects, features, and advantages of the present application more apparent, below with reference to
Attached drawing is described in detail the specific embodiment of the application.
Referring to fig. 2, which is a kind of flow diagram of method for heating and controlling provided by the embodiments of the present application.
Method for heating and controlling provided by the embodiments of the present application, suitable for heating control system as illustrated in figs. 1A and ib,
It can be configured in one or more controllers, the one or more controller is through in driving circuit connection heating control system
Switch on the bridge pipe and bridge switch pipe, it is supreme with output pulse width modulation (Pulse Width Modulation, PWM) signal
Bridge switch pipe and bridge switch control are made it and are switched on or off.The application is described in detail below with reference to example shown in Fig. 1 a to implement
The method for heating and controlling that example provides, the implementation of the heating control system of other structures is similar, referring specifically to mutually speaking on somebody's behalf
It is bright, no longer repeat one by one.
It should also be noted that, the system shown in Fig. 1 b in, heat branch 10 and 20 in bridge switch pipe Kd1 and
Kd2 and switch on the bridge pipe Ku1 uses method for heating and controlling provided by the present application, and to the bridge switch pipe in heating branch 30
The control mode of Kd3 and switch on the bridge pipe Ku2 are not construed as limiting, and arbitrarily existing control mode can be used, the application can also be used and mention
The method for heating and controlling of confession.
Method for heating and controlling provided by the embodiments of the present application, includes the following steps S201 and S202:
S201: exporting the first pwm signal for controlling bridge switch pipe, with prefixed time interval selection control at least one
A bridge switch pipe is open-minded.
It is understood that bridge switch pipe according to receive the first pwm signal low and high level output variation open and
Shutdown.In practical applications, it can be to export first pwm signal to each bridge switch pipe and control it and open and close
It is disconnected.In the embodiment of the present application, period of the prefixed time interval less than the first pwm signal.
In the embodiment of the present application, as an example, at least one bridge switch pipe is controlled with prefixed time interval to open
Logical specifically to also refer to, first bridge switch pipe (the bridge switch pipe Kd1 in such as Fig. 1 a) of control first is open-minded, and first
Bridge switch pipe open after prefixed time interval after, control second bridge switch pipe (bridge switch pipe in such as Fig. 1 a
Kd2) open-minded.Then, after the prefixed time interval after second bridge switch pipe is opened, then third bridge switch pipe is controlled
(the bridge switch pipe Kd3 in such as Fig. 1 a), and so on.In a prefixed time interval, only one bridge switch pipe is opened
It is logical.In another example, it is open-minded that multiple bridge switch pipes also be can control in each prefixed time interval, the embodiment of the present application
It does not limit this.
When it is implemented, according to the actual situation and specifically prefixed time interval can be set demand for control, as one
Example, when heating control system includes N number of bridge switch pipe, prefixed time interval can be set to T/N, and T is the first PWM letter
Number period.
Due to bridge switch pipe each in the embodiment of the present application replace it is open-minded, reduce within a control period it is each under
The number of switches of bridge switch pipe reduces the switching frequency of each bridge switch pipe, increases the service life of bridge switch pipe,
It has been correspondingly improved the service life of heating control system and electric heater.
S202: the second pwm signal for controlling switch on the bridge pipe is exported, is turned on and off with controlling switch on the bridge pipe.
In the embodiment of the present application, period of the period of the second pwm signal less than the first pwm signal.For example, T is first
The period of pwm signal, then the period of the second pwm signal can be T/15.It should be noted that in the embodiment of the present application and unlimited
Determine the sequence that executes of step S201 and step S202, can set, will not enumerate according to specific needs in practical application.
It is similar with the first pwm signal, in practical applications, it can be to each switch on the bridge pipe (upper bridge in such as Fig. 1 a
Switching tube Ku) it exports second pwm signal and controls it and turn on and off, it is also possible to export second pwm signal extremely
To control turning on and off for each switch on the bridge pipe, the embodiment of the present application is not specifically limited in this embodiment heating control system.It can
With understanding, when any one switch on the bridge pipe and bridge switch pipe are opened, power supply can be connection therebetween
Heating element power supply make its work.
Referring to Fig. 3, a kind of illustrated circuit topology of specific heating control system of the figure.In practical applications,
Switch on the bridge pipe can use boostrap circuit drive control, which includes bootstrap capacitor C1.
Then in some possible implementations of the present embodiment, when heating control system opens machine, the first PWM letter is first exported
It is open-minded number to control at least one bridge switch pipe (such as bridge switch pipe Kd1), charges for bootstrap capacitor C1；As bootstrap capacitor C1 two
When the voltage difference at end meets the driving voltage requirement of switch on the bridge pipe Ku, then export the second pwm signal control switch on the bridge pipe Ku
It is open-minded.
Because heating element is generally resistance class component, resistance is smaller, and it is (false that at least one bridge switch pipe is controlled when opening machine
It is set as bridge switch pipe Kd1) it turns off, the access of power Vcc heated element H1 and bridge switch pipe Kd1 fill bootstrap capacitor C1
Electricity, the control bridge switch pipe Kd1 turn-off time meets bootstrapping demand, so that the voltage difference at the both ends bootstrap capacitor C1 is enough after maintaining
When continuing driving voltage demand when Ku shutdown, exporting, the second pwm signal control switch on the bridge pipe is open-minded.
It is gradually decreased since after switch on the bridge pipe Ku shutdown, the voltage on bootstrap capacitor C1 is consumed, therefore, in this Shen
Please be in some possible implementations of embodiment, the turn-off time of switch on the bridge pipe Ku should be less than the electricity at the both ends bootstrap capacitor C1
Pressure difference drops to the discharge time of the minimum drive voltage of switch on the bridge pipe Ku, and/or, when switch on the bridge pipe Ku shutdown, control
Make at least one bridge switch pipe (such as bridge switch pipe Kd1) is open-minded, so that the voltage difference at the both ends bootstrap capacitor C1 meets upper bridge
The driving voltage requirement of switching tube Ku, to guarantee to enable to switch on the bridge pipe Ku normally open-minded in practical control process,
Without the driving voltage that is provided by boostrap circuit it is insufficient due to there is control mistake.
After the heating control system works normally, switch on the bridge pipe Ku open according to the period of the second pwm signal and
Shutdown, since heating element has inductance characteristic, when switch on the bridge pipe Ku is switched to shutdown by opening, if under some
Bridge switch pipe (such as bridge switch pipe Kd1) is open-minded, and power supply VCC will charge to power supply capacitor C1, can satisfy subsequent drive demand.
When multiple bridge switch pipe Kd1, Kd2 and Kd3 are opened in turn, to meet switch on the bridge pipe Ku driving voltage demand,
When opening machine, at least one bridge switch pipe (such as bridge switch pipe Kd1) is opened first as bootstrap capacitor C1 charging.Show as one
Example, bridge switch pipe shift to an earlier date the t1 of service time compared with switch on the bridge pipe, and the voltage difference at the both ends bootstrap capacitor C1 can be made to meet
Driving voltage demand in 5 periods of bridge switch pipe.In normal operating conditions, when bridge switch pipe is opened and switch on the bridge
When pipe Ku is turned off, power Vcc is again by heating element and bridge switch pipe (such as heating element H2 and bridge switch pipe Kd2) institute
Heating branch to bootstrap capacitor C1 charge, the time of charging meet next heating branch be bootstrap capacitor C1 charge before,
The voltage difference at the both ends bootstrap capacitor C1 can satisfy the voltage requirement of driving switch on the bridge pipe Ku, guarantee heating control system just
Often work.Fig. 4 is the waveform for being illustrated a kind of pwm signal with system shown in Fig. 3.It is understood that at pwm signal
The switching tube that it is controlled when high level is open-minded.
The embodiment of the present application is applied to the heating including the heating branch in parallel of at least one switch on the bridge pipe and at least 2
Control system.The heating branch includes concatenated bridge switch pipe and heating element；A plurality of heating branch and institute after parallel connection
Switch on the bridge pipe is stated to be connected between the positive and negative anodes of power supply.In control, first for controlling bridge switch pipe is exported
Pwm signal and the second pwm signal for controlling switch on the bridge pipe, control switch on the bridge pipe are switched on or off, and with it is default when
Between interval selection control at least one bridge switch pipe it is open-minded, reduce the open and close times of bridge switch pipe, ensure that lower bridge is opened
In the service life for closing pipe, extend the service life of electric heater.
Common method for heating and controlling output fixed frequency or duty ratio pwm signal, when the voltage of power supply becomes
When change, can not adaptability electric heater is controlled, constant temperature, energy-efficient effect be poor.In view of this, in the embodiment of the present application
In some possible implementations, the first pwm signal and the second pwm signal is adjusted in the property of may also adapt to, and guarantees electricity
Heater is exported with target power, optimizes the control to electric heater, when the voltage not timing of power supply can also maintain water
It is warm or room temperature constant.It is described in detail with reference to the accompanying drawing.
Referring to Fig. 5, which is the flow diagram of another method for heating and controlling provided by the embodiments of the present application.
On the basis of the above embodiments, which can also include the following steps S501-S503.
S501: control instruction is received.
In the embodiment of the present application, control instruction is used to indicate electric heater work, carries the target power of heating.One
In a example, the target power of carrying specifically can be to be obtained according to target water temperature, can also target power be converted to electricity
Heating control system is sent to after stream in the form of control instruction.
S502: the actual power of heating element is obtained.
In the embodiment of the present application, the actual power of heating element can be obtained according to its practical running current, including be added
The general power of heating element reality output in thermal control system.
S503: according to target power and actual power, the duty ratio of the first pwm signal is adjusted.
In practical applications, proportional integration can be carried out according to the difference of target power and actual power
(proportional integral, PI) is adjusted, and further adjusts accounting for for the first pwm signal according to the output valve that PI is adjusted
Empty ratio, to realize the constant temperature output of electric heater.
In some possible implementations, step S503 can specifically include step S5031-S5033.
S5031: judge the size relation of target power and actual power；When target power is less than actual power, execute
Step S5032；When target power is greater than actual power, step S5033 is executed.
S5032: reduce the duty ratio of the first pwm signal.
S5033: increase the duty ratio of the first pwm signal.
It is understood that the duty ratio for reducing the first pwm signal can be reduced when target power is less than actual power
The service time of bridge switch pipe reduces the output power of heating element to target power；And when target power is greater than practical function
When rate, the duty ratio for increasing the first pwm signal can increase the service time of bridge switch pipe, improve the output work of heating element
Rate guarantees electric heater with target function to target power so that the output power of heating element be made to maintain near target power
Rate output, optimizes the control of electric heater.
It after step S502, can also be wrapped in some possible implementations of the embodiment of the present application with continued reference to Fig. 5
It includes:
S504: when bridge switch pipe is breakdown, if actual power is greater than target power, according to target power and reality
Power adjusts the duty ratio of the second pwm signal.
It is understood that will lead to defeated using the first pwm signal adjusting electric heater when bridge switch pipe is breakdown
The control of power is invalid out.The heating element that breakdown bridge switch pipe is connected only is controlled by the second pwm signal, it may appear that
The excessive situation of output power.Therefore, in the embodiment of the present application, when bridge switch pipe is breakdown, if actual power is greater than
Target power adjusts the duty ratio of the second pwm signal, can not only guarantee electric heating then according to target power and actual power
Device is exported with target power, it may also be ensured that the power nonoverload of electric heater, guarantees the safety of electric heater.
In some possible implementations, step S504 can specifically include step S5041-S5043.
S5041: judge the size relation of the target power and the actual power；When target power is less than actual power
When, execute step S5042；When target power is greater than actual power, step S5043 is executed.
S5042: reduce the duty ratio of the second pwm signal.
S5043: increase the duty ratio of the second pwm signal.
Similarly with above-mentioned steps S5031-S5033, when target power is less than actual power, reduce the second pwm signal
Duty ratio can reduce the service time of switch on the bridge pipe, reduce the output power of heating element to target power, it is ensured that electricity plus
The power nonoverload of hot device, guarantees the safety of electric heater；And when target power is greater than actual power, increase the 2nd PWM letter
Number duty ratio can increase service time of switch on the bridge pipe, improve the output power of heating element to target power, thus
It maintains the output power of heating element near target power, guarantees that electric heater is exported with target power.
The method for heating and controlling provided based on the above embodiment, the embodiment of the present application also provides a kind of computer heating control dresses
It sets.
Referring to Fig. 6, which is a kind of structural schematic diagram of heating control apparatus provided by the embodiments of the present application.
Heating control apparatus provided by the embodiments of the present application, the heating control system (example introduced applied to above content
As illustrated in figs. 1A and ib), which includes: lower bridge control module 100 and upper bridge control module 200；
Lower bridge control module 100, for exporting the first pwm signal for controlling bridge switch pipe, between preset time
It is open-minded that at least one bridge switch pipe is controlled every selection；Period of the prefixed time interval less than the first pwm signal；
Upper bridge control module 200 is opened for exporting the second pwm signal for controlling switch on the bridge pipe with controlling upper bridge
Pipe is closed to turn on and off.
In the embodiment of the present application, period of the period of the second pwm signal less than the first pwm signal.For example, T is first
The period of pwm signal, then the period of the second pwm signal can be T/15.
It should be noted that in practical applications, switch on the bridge pipe can use boostrap circuit drive control, boostrap circuit
Including bootstrap capacitor；
Then, the heating control apparatus can also include: main control module；
Main control module exports the control of the first pwm signal at least for when control system opens machine, controlling lower bridge control module
One bridge switch pipe is open-minded, with the charging for bootstrap capacitor；It is also used to open when the voltage difference at bootstrap capacitor both ends meets upper bridge
When closing the driving voltage requirement of pipe, it is open-minded to export the second pwm signal control switch on the bridge pipe for bridge control module in control.
Optionally, the voltage that the service time of switch on the bridge pipe is less than or equal to bootstrap capacitor both ends drops to switch on the bridge
The discharge time of the minimum drive voltage of pipe；And/or it when the shutdown of switch on the bridge pipe, controls at least one bridge switch pipe and opens
It is logical, so that the voltage difference at bootstrap capacitor both ends meets the driving voltage requirement of switch on the bridge pipe.
In some possible implementations of the embodiment of the present application, as shown in fig. 7, the device can also include: that instruction connects
Receive module 300 and data acquisition module 400；
Command reception module 300, for receiving control instruction, control instruction carries the target power of heating；
Data acquisition module 400, for obtaining the actual power of heating element；
Lower bridge control module 100 is also used to adjust the duty ratio of the first pwm signal according to target power and actual power.
Optionally, lower bridge control module 100, can specifically include: judging submodule, the first adjustment submodule and second are adjusted
Whole submodule；
Judging submodule, for judging the size relation of target power and actual power；
The first adjustment submodule, for subtracting when the judging result of judging submodule is that target power is less than actual power
The duty ratio of small first pwm signal；
Second adjustment submodule, for increasing when the judging result of judging submodule is that target power is greater than actual power
The duty ratio of big first pwm signal.
With continued reference to Fig. 7, in some possible implementations of the embodiment of the present application, which can also include: breakdown
Identification module 500 and power judgment module 600；
Puncture identification module 500, whether bridge switch pipe is breakdown for identification；
Power judgment module 600 is also used to judge reality when breakdown identification module 500 determines that bridge switch pipe is breakdown
Whether border power is greater than target power；
Upper bridge control module 200 is also used to judge whether actual power is greater than target power when power judgment module 600
When, according to target power and actual power, adjust the duty ratio of the second pwm signal.
Optionally, upper bridge control module 200, can specifically include: judging submodule, the first adjustment submodule and second are adjusted
Whole submodule；
Judging submodule, for judging the size relation of target power and actual power；
The first adjustment submodule, for subtracting when the judging result of judging submodule is that target power is less than actual power
The duty ratio of small second pwm signal；
Second adjustment submodule, for increasing when the judging result of judging submodule is that target power is greater than actual power
The duty ratio of big second pwm signal.
The embodiment of the present application is applied to the heating control including at least one switch on the bridge pipe and a plurality of heating branch in parallel
System processed.Every heating branch includes concatenated bridge switch pipe and heating element；A plurality of heating branch after parallel connection
It is connected between the positive and negative anodes of power supply with the switch on the bridge pipe.In control, export for controlling bridge switch pipe
First pwm signal and the second pwm signal for controlling switch on the bridge pipe, control switch on the bridge pipe are periodically switched on or off,
And select at least one bridge switch pipe of control open-minded with prefixed time interval, reduce the open and close times of bridge switch pipe, protects
The service life for having demonstrate,proved bridge switch pipe extends the service life of electric heater.
It should be noted that each embodiment in this specification is described in a progressive manner, each embodiment emphasis is said
Bright is the difference from other embodiments, and the same or similar parts in each embodiment may refer to each other.For reality
For applying device disclosed in example, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related place ginseng
See method part illustration.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The above is only the preferred embodiment of the application, not makes any form of restriction to the application.Though
Right the application has been disclosed in a preferred embodiment above, however is not limited to the application.It is any to be familiar with those skilled in the art
Member, in the case where not departing from technical scheme ambit, all using the methods and technical content of the disclosure above to the application
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical scheme, any simple modification made to the above embodiment of the technical spirit of foundation the application are equal
Variation and modification, still fall within technical scheme protection in the range of.
Claims (10)
1. a kind of method for heating and controlling, which is characterized in that be applied to heating control system；The heating control system, including extremely
A few switch on the bridge pipe and at least 2 heating branches in parallel；
The heating branch includes concatenated bridge switch pipe and heating element；
Heating branch and the switch on the bridge pipe after parallel connection are connected between the positive and negative anodes of power supply；
The method, comprising:
The first pwm signal for controlling the bridge switch pipe is exported, selects to control at least one institute with prefixed time interval
It is open-minded to state bridge switch pipe；The prefixed time interval is less than the period of first pwm signal；
The second pwm signal for controlling the switch on the bridge pipe is exported, is turned on and off with controlling the switch on the bridge pipe；
The period of second pwm signal is less than the period of first pwm signal.
2. the method according to claim 1, wherein the switch on the bridge pipe use boostrap circuit drive control,
The boostrap circuit includes bootstrap capacitor；The method, further includes:
When the heating control system opens machine, first exports first pwm signal and control at least one described bridge switch pipe
It is open-minded, for the charging bootstrap capacitor；
When the voltage difference at the bootstrap capacitor both ends meets the driving voltage requirement of the switch on the bridge pipe, then export described
It is open-minded that two pwm signals control the switch on the bridge pipe.
3. according to the method described in claim 2, it is characterized in that,
The voltage difference that the service time of the switch on the bridge pipe is less than or equal to the bootstrap capacitor both ends drops to the upper bridge
The discharge time of the minimum drive voltage of switching tube；
And/or
When switch on the bridge pipe shutdown, it is open-minded to control at least one described bridge switch pipe, so that the bootstrap capacitor two
The voltage difference at end meets the driving voltage requirement of the switch on the bridge pipe.
4. method according to claim 1-3, which is characterized in that the method, further includes:
Control instruction is received, the control instruction carries the target power of heating；
Obtain the actual power of the heating element；
According to the target power and the actual power, the duty ratio of first pwm signal is adjusted.
5. method according to claim 1 to 3, which is characterized in that the actual power for obtaining the heating element, it
After include:
When the bridge switch pipe is breakdown, if the actual power is greater than the target power, according to the target function
Rate and the actual power adjust the duty ratio of second pwm signal.
6. a kind of heating control apparatus, which is characterized in that be applied to heating control system；The heating control system, comprising: extremely
A few switch on the bridge pipe and at least 2 heating branches in parallel；
The heating branch includes concatenated bridge switch pipe and heating element；
Heating branch and the switch on the bridge pipe after parallel connection are connected between the positive and negative anodes of power supply；
Described device, comprising: lower bridge control module and upper bridge control module；
The lower bridge control module, for exporting the first pwm signal for controlling the bridge switch pipe, between preset time
It is open-minded that at least one described bridge switch pipe is controlled every selection；The prefixed time interval is less than the week of first pwm signal
Phase；
The upper bridge control module, for exporting the second pwm signal for controlling the switch on the bridge pipe, to control on described
Bridge switch pipe turns on and off；
The period of second pwm signal is less than the period of first pwm signal.
7. device according to claim 6, which is characterized in that the switch on the bridge pipe uses boostrap circuit drive control,
The boostrap circuit includes bootstrap capacitor；
Described device, further includes: main control module；
The main control module exports the first PWM for when the control system opens machine, controlling the lower bridge control module
It is open-minded that signal controls at least one described bridge switch pipe, with the charging for the bootstrap capacitor；It is also used to when the bootstrapping electricity
When the voltage difference at appearance both ends meets the driving voltage requirement of the switch on the bridge pipe, control described in the upper bridge control module output
It is open-minded that second pwm signal controls the switch on the bridge pipe.
8. device according to claim 7, which is characterized in that
The voltage that the service time of the switch on the bridge pipe is less than or equal to the bootstrap capacitor both ends drops to the upper bridge and opens
Close the discharge time of the minimum drive voltage of pipe；
And/or
When switch on the bridge pipe shutdown, it is open-minded to control at least one described bridge switch pipe, so that the bootstrap capacitor two
The voltage difference at end meets the driving voltage requirement of the switch on the bridge pipe.
9. according to the described in any item devices of claim 6-8, which is characterized in that described device, further includes: command reception module
And data acquisition module；
Described instruction receiving module, for receiving control instruction, the control instruction carries the target power of heating；
The data acquisition module, for obtaining the actual power of the heating element；
The lower bridge control module is also used to adjust first pwm signal according to the target power and the actual power
Duty ratio.
10. device according to claim 9, which is characterized in that described device, further includes: breakdown identification module and power
Judgment module；
The breakdown identification module, whether the bridge switch pipe is breakdown for identification；
The power judgment module is also used to when the breakdown identification module determines that the bridge switch pipe is breakdown, judgement
Whether the actual power is greater than the target power；
The upper bridge control module is also used to judge whether the actual power is greater than the target when the power judgment module
When power, according to the target power and the actual power, the duty ratio of second pwm signal is adjusted.
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