CN107303794A - A kind of PTC liquid heater and its method for heating and controlling - Google Patents
A kind of PTC liquid heater and its method for heating and controlling Download PDFInfo
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- CN107303794A CN107303794A CN201610257448.0A CN201610257448A CN107303794A CN 107303794 A CN107303794 A CN 107303794A CN 201610257448 A CN201610257448 A CN 201610257448A CN 107303794 A CN107303794 A CN 107303794A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
- B60H1/2218—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters controlling the operation of electric heaters
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Abstract
When being heated to solve existing PTC liquid heater; it is likely to occur current peak point so that vehicle starting protection measure, disconnects high tension loop; cause the inoperable problem of PTC heating modules, the invention provides a kind of PTC liquid heater and its method for heating and controlling.PTC liquid heater, including the first heating module, the second heating module, first switch, second switch, the first drive circuit, the second drive circuit, high-tension circuit and controller；First heating module includes x PTC heating module in parallel；Second heating module includes y PTC heating module in parallel；And controller is sent to the first logical signal of the first drive circuit and the second logical signal delay preset time t of the second drive circuit.The present invention provide PTC liquid heater, it is above-mentioned using two grades packet plus PWM control by way of, rush of current can be reduced, current peak point is effectively prevented so that its control mode is safer.
Description
Technical field
The present invention relates to new-energy automotive air-conditioning heating system, especially PTC liquid heater field therein.
Background technology
With the development of the fast development of new-energy automobile, especially high pressure pure electric automobile, whole-vehicle air-conditioner heating
Scheme changes therewith, and its comprehensive safe and stable, comfortableness, current trend is to use high voltage P TC
Liquid heater, has met the demands such as heating, defrosting, demisting.
Existing PTC liquid heater mainly include some heating modules, some controlling switches (common be IGBT),
Some drive circuits, high-tension circuit and controller；The heating module includes some PTC heating modules；Institute
Controlling switch is stated to be connected between the high-tension circuit and heating module, the control end of the controlling switch with it is described
Drive circuit is connected, and the drive circuit is connected to controller；The high-tension circuit passes through the controlling switch
Power supply is provided for the heating module；The controller sends control signals to drive circuit, drive circuit
Drive signal is generated, the break-make of the controlling switch is driven.Above-mentioned controlling switch, drive circuit and high-tension electricity
Road, controller are usually installed on a control panel.
At present, the pattern that existing PTC liquid heater is typically controlled using gear, temperature is set according to user
Gear is selected, selects correspondence heating module to be heated by controlling the break-make of each controlling switch；This kind
Gear break-make temperature control, Temperature jump is larger, and comfortableness is not enough.In addition, when stating control panel in design, with
The difference of the number of above-mentioned PTC heating modules, the number of its drive circuit, controlling switch etc. also changes therewith
Become, namely the PTC liquid heater of different capacity, different model need to design matching control panel, no
Beneficial to hardware and software platform；And powerful PTC liquid heater control of product board size is big, take up space big.Gear
Control configures IGBT according to heats module packet count, and packet is more, and temperature control is better, comfortableness
Better, the IGBT used is also more, and cost is higher.
In addition, applicant has found in R＆D process, it is existing also to there is part PTC liquid heater to use PWM
The mode of control, it is to the variable pwm signal of controlling switch output duty cycle, to control each heating module
Heat time, in this way, it is possible to prevente effectively from Temperature jump.
However, it is found by the applicant that this kind simple by the way of PWM controls, due to PTC heating modules
Characteristic is the rising with temperature, resistance increase；Temperature drop, resistance declines；Therefore, if PTC adds
The number of thermal modules is more, relatively low in temperature when being heated using full power (dutycycle 100%)
When, its electric current will be larger, if electric current exceedes the current peak point allowed in high-tension circuit, vehicle will be opened
Dynamic safeguard measure, disconnects high tension loop, causes PTC heating modules therefore can not work.
The content of the invention
When being heated to solve existing PTC liquid heater using full power, in fact it could happen that current peak point,
So that vehicle starting protection measure, disconnects high tension loop, causes the inoperable problem of PTC heating modules,
The invention provides a kind of PTC liquid heater and its method for heating and controlling.
One aspect of the present invention provides a kind of PTC liquid heater, including the first heating module, the second heating
Module, first switch, second switch, the first drive circuit, the second drive circuit, high-tension circuit and control
Device；
First heating module includes x PTC heating module in parallel；Second heating module includes parallel connection y
Individual PTC heating modules；
It is that first heating module and second heating module provide high-tension electricity that the high-tension circuit, which is used for,；
First switch is serially connected between the high-tension circuit and first heating module, and second switch connects
Between the high-tension circuit and second heating module；
The controller is used to receive the PWM temperature signals with total dutycycle γ, by the PWM temperature controls
Signal is converted into the first dutycycle γ1The first logical signal and with the second dutycycle γ2The second logic
Signal, and first logical signal is sent to the first drive circuit, the second logical signal is sent to
Two drive circuits；And controller is sent to the first logical signal and second drive circuit of the first drive circuit
Second logical signal delay preset time t；
First drive circuit input is connected to controller, receives first logical signal；Output end is connected
The control end of the first switch, for there is the first dutycycle γ to first switch output1First driving
Signal, to control the break-make of the first switch；
The input of second drive circuit is connected to controller, receives second logical signal；Output end connects
The control end of the second switch is connect, for there is the second dutycycle γ to second switch output2Second
Drive signal, to control the break-make of the second switch.
Further, the PWM temperature signals are passed according to the setting temperature T0 and temperature that are inputted including user
Parameter generation including the Current Temperatures T1 that sensor is detected.
Further, the PWM temperature signals are passed according to the setting temperature T0, temperature that are inputted including user
Parameter generation including Current Temperatures T1 and air conditioning exhausting speed that sensor is detected.
Further, the x≤y.
Further, the first dutycycle γ of the first logical signal1With the second dutycycle γ of the second logical signal2
Meet following expression：
Wherein, as γ in above-mentioned expression formula1、γ2When numerical value is more than or equal to 1,1 is identified as；γ in expression formula1、
γ2When numerical value is less than or equal to 0,0 is identified as.
Further, the first switch and the second switch are IGBT.
Further, the first switch, second switch, the first drive circuit, the second drive circuit, height
Volt circuit and controller are arranged on a control panel.
Further, first heating module and the second heating module are installed in a shell built with coolant
In body, heater is formed；The control panel be arranged on the heater top, and the control panel and
Isolated between the heater by an insulated heat part.
Further, the heater top is additionally provided with a battery lead plate, and the battery lead plate fills the heating
The electrode for putting each PTC heating modules is electrically connected on the battery lead plate, and the circuit by being disposed thereon
Draw some electrode columns；The electrode column is electrically connected with the electric-controlled plate.
Further, the PTC in the PTC heating modules and the second heating module in first heating module
The interspersed arrangement of heating module.
The present invention provides two gears of only division of PTC liquid heater, only need to be by each PTC heating modules point
For the first heating module and the second heating module, PWM control modes control the is passed through using two controlling switches
One heating module and the second heating module, greatly save cost.The compatible various different work(of its control mode
The product platform of the PTC liquid heater of rate, more conducively different structure, different model, reduces big work(
Rate PTC liquid heater control cabinet size, saves space.Controlled by above-mentioned using two grades of packets plus PWM
The mode of system, can reduce rush of current, effectively prevent current peak point so that its control mode is more
Plus safety.Realize gear infinitely to divide, realize electrodeless temperature control, the linear increasing or decreasing of Temperature jump,
Comfortableness is fabulous.
Second aspect of the present invention provides a kind of method for heating and controlling of PTC liquid heater, the heating control
Method processed comprises the following steps：
Controller was received according to working as that the setting temperature T0 and temperature sensor that include user's input are detected
The PWM temperature signals with total dutycycle γ of parameter generation including preceding temperature T1 and air conditioning exhausting speed,
The PWM temperature signals are converted into the first dutycycle γ1The first logical signal and accounted for second
Sky compares γ2The second logical signal, and first logical signal is sent to the first drive circuit, by second
Logical signal is sent to the second drive circuit；
First drive circuit receives the first logical signal, and the first drive signal is exported to first switch, controls institute
The break-make of first switch is stated, to realize the break-make of the first heating module；Second drive circuit receives the second logic
Signal, the second drive signal is exported to second switch, the break-make of the second switch is controlled, to realize second
The break-make of heating module.
Further, it specifically includes following steps：
SA, low-power heating stepses：Total dutycycle γ of the PWM temperature signals meets following expression：
First heating module is to meet heating demand, only starts the first drive module and drives the first heating module work
Make, the second heating module does not work；First dutycycle γ of the first logical signal that now controller is sent1With
Second dutycycle γ of two logical signals2Meet following expression：
Wherein, γ is worked as1When >=1, γ1=1；
γ2=0；
SB, high power heating stepses：Total dutycycle γ of the PWM temperature signals meets following expression：
Now the first dutycycle γ of the first logical signal1Meet following expression：
γ1=1；
First heating module is first carried out after full shelves work, delay preset time t, starts the work of the second heating module；
Second dutycycle γ of the second logical signal that now controller is sent2Meet following expression：
Further, also comprise the following steps：
SC, cooling step：Total dutycycle γ=0 for the PWM temperature signals that controller is received；Controller is sent out
First dutycycle γ of the first logical signal gone out1Meet following expression：γ1=0；
Turn off the first heating module；
After preset time t, the second dutycycle γ of the second logical signal that controller is sent2Satisfaction is expressed as below
Formula：γ2=0；
Turn off the second heating module.
Further, the preset time t is 5 seconds.
The method for heating and controlling provided using the present invention, its basis has total dutycycle γ PWM temperature signals,
The first logical signal and the second logical signal are sent accordingly to the first drive circuit and the second drive circuit, control
The second logical signal delay that device is sent to the first logical signal and the second drive circuit of the first drive circuit is pre-
If time t.In this way, when the preset temperature and smaller Current Temperatures difference that its needs is heated, can only enable
First heating module, when preset temperature and the Current Temperatures difference for needing to heat are larger, can be pre-actuated
First heating module, the second heating module is preheated by the first heating module, through being delayed after preset time t, then
Start the second heating module.When needing cooling after product work, take and first disconnect the first heating module, then
Through being delayed, the mode for controlling the second heating module to disconnect again after preset time t realizes cooling.In this way, realizing segmentation
Control simple using the high peak current risk being likely to occur caused by PWM control modes to evade.By upper
State by the way of two grades of packets plus PWM controls, reduce rush of current, can effectively prevent current peak
It is worth point so that its control mode is safer.Realize gear infinitely to divide, realize electrodeless temperature control, temperature
The linear increasing or decreasing of saltus step is spent, comfortableness is fabulous.
Brief description of the drawings
Fig. 1 is the PTC liquid heater schematic block diagram provided in the specific embodiment of the invention；
Fig. 2 is the first heating module schematic diagram provided in the specific embodiment of the invention；
Fig. 3 is the second heating module schematic diagram provided in the specific embodiment of the invention；
Fig. 4 is the PTC liquid heater schematic front view provided in the specific embodiment of the invention；
Fig. 5 is the PTC liquid heater schematic top plan view provided in the specific embodiment of the invention；
Fig. 6 is the PTC liquid heater schematic side view provided in the specific embodiment of the invention；
Fig. 7 is the computer heating control block diagram of the PTC liquid heater provided in the specific embodiment of the invention.
Wherein, 1, PTC heating modules；2nd, insulated heat part；3rd, control panel；4th, boss；C, control
Device processed；V, high-tension circuit；D1, the first drive circuit；D2, the second drive circuit；K1, first switch；
K2, second switch；P1, the first heating module；P2, the second heating module.
Embodiment
In order that technical problem solved by the invention, technical scheme and beneficial effect are more clearly understood, with
Lower combination drawings and Examples, the present invention will be described in further detail.It should be appreciated that described herein
Specific embodiment only to explain the present invention, be not intended to limit the present invention.
Embodiment 1
This example will carry out specific explanations explanation to PTC liquid heater disclosed by the invention.As shown in Figure 1
Block diagram, PTC liquid heater include the first heating module P1, the second heating module P2, first switch K1,
Second switch, the first drive circuit D1, the second drive circuit D2, high-tension circuit V and controller C；
Wherein, as shown in Fig. 2 the first heating module P1 includes x PTC heating module 1 in parallel；
Such as, the common x PTC heating modules 1 of mx that marked m1, m2, m3 in figure ...；As shown in figure 3,
Second heating module P2 includes y PTC heating module 1 in parallel, such as, in figure marked n1, n2, n3,
The common y PTC heating modules 1 of n4 ... ny；Wherein, above-mentioned x, y numerical value are by PTC liquid heater
Heating power determine, as preferred mode, in this example, the x≤y；
Above-mentioned PTC heating modules 1 are known to the public, and it mainly includes some PTC (English full name in parallel：
Positive Temperature Coefficient, Chinese full name：Text degree coefficient) thermistor, and two
Electrode terminal and insulating barrier etc. are constituted.PTC thermistor is a kind of half of typical case with temperature sensitivity
Conductor resistance, during more than certain temperature, its resistance value is with rise the increasing in step evolution of temperature.
It is that the first heating module P1 and the second heating module P2 are provided that the high-tension circuit V, which is used for,
High-tension electricity；
First switch K1 is serially connected between the high-tension circuit V and the first heating module P1, and second opens
Concatenation is closed to be connected between the high-tension circuit V and the second heating module P2；
The controller C is used for PWM (the English full name with total dutycycle γ：Pulse Width Modulation,
Chinese full name：Pulse width modulation) temperature signal, the PWM temperature signals are converted into and accounted for first
Sky compares γ1The first logical signal and with the second dutycycle γ2The second logical signal, and described first is patrolled
Collect signal and be sent to the first drive circuit D1, the second logical signal is sent to the second drive circuit D2；Institute
State PWM temperature signals according to including user input setting temperature T0 and temperature sensor detect it is current
Parameter generation including temperature T1.Further, the PWM temperature signals are according to including user's input
Parameter including the Current Temperatures T1 and air conditioning exhausting speed that temperature T0, temperature sensor are detected is set
Generation.
Specifically, the PWM temperature signals are specifically received from the ACCU (Chineses on vehicle：Air-conditioning control
System, English name：Air Conditioning Controller Unit), the ACCU is inputted according to including user
Setting temperature T0 and the Current Temperatures T1 that detects of temperature sensor and air conditioning exhausting speed including parameter
PWM temperature signal of the generation with total dutycycle γ.Then the PWM temperature signals are sent to the control
Device C.
Set temperature T0 general by with the regulation for realizing temperature on control panel in the car, and temperature sensor
The Current Temperatures T1 of detection, generally comprises temperature in the compartment of in-car, car external environment temperature etc., comes comprehensive with this
Close and consider.It can also increase more Considerations as further preferred mode, make it with this
The PWM temperature signals of output are more reasonable.
PWM (pulse width modulation) is known to the public, and pulse width modulation is the numeral using microprocessor
A kind of very effective technology for exporting to be controlled analog circuit, is widely used in from measurement, communication
Into many fields of Power Control and conversion.Its according to the change of respective loads come modulation transistor base stage or
The biasing of metal-oxide-semiconductor grid, to realize the change of transistor or metal-oxide-semiconductor ON time, so as to realize switch
The change of voltage-stabilized power supply output.This mode can make the output voltage of power supply keep permanent in operation conditions change
It is fixed, it is a kind of very effective technology being controlled using the data signal of microprocessor to analog circuit.
Repeat no more.
First drive circuit D1 inputs are connected to controller C, receive first logical signal；Output end
The control end of the first switch K1 is connected, for there is the first dutycycle to first switch K1 outputs
γ1The first drive signal, to control the break-make of the first switch K1；
Second drive circuit D2 input is connected to controller C, receives second logical signal；Output
The control end of the end connection second switch, for there is the second dutycycle γ to second switch output2's
Second drive signal, to control the break-make of the second switch.
First logical signal and the second logical signal are also pwm signal.Wherein, in this example, the first logic
First dutycycle γ of signal1With the second dutycycle γ of the second logical signal2Meet following expression：
Wherein, as γ in above-mentioned expression formula1、γ2When numerical value is more than or equal to 1,1 is identified as；γ in expression formula1、
γ2When numerical value is less than or equal to 0,0 is identified as, and controller C is sent to the first of the first drive circuit D1 and patrolled
Collect signal and the second drive circuit D2 the second logical signal delay preset time t.
Controller C be sent to the first drive circuit D1 the first logical signal and the second drive circuit D2
Two logical signals delay preset time t, specific explanations are, when it needs to be heated, and it can be as needed
Judge whether that only the first heating module P1 need to be started, still need to start the first heating module P1 and the second heated mould
Group P2.If necessary to start the first heating module P1 and the second heating module P2, it could realize and enter faster
Row heating purpose, then now, it is possible to current peak point occur, cause PTC liquid heater occur by
The phenomenon of work is disconnected in the protection of itself.Therefore, in this example in heating process, setting a delay pre-
If the time, when the first heating module P1 and the second heating module P2 is both needed to start work, although its basis
First dutycycle and the second dutycycle are operated, and still, controller C is sent to the second drive circuit D2
Signal relative have a delay preset time t so that it starts the first heating module P1 in initial heating, only
(the less heating module of PTC heating modules 1) is operated, and the first heating module P1 heat transfer is given
Second heating module P2, preheats the second heating module P2, the PTC heated moulds in the second heating module P2
The temperature of block 1 is raised so that its resistance is raised, and its total current reduces.When it is without being heated, and it need to enter
During row cooling, the first heating module P1 is also first turned off in advance, then after delay preset time t, then turns off the
Two heating module P2.In this way, it is possible to prevente effectively from there is peak point current, this exactly core content of the invention.
Above-mentioned first drive signal and the second drive signal remain as pwm signal, and it only changes above-mentioned first
The voltage swing of logical signal and the second logical signal, to realize its driving force.And do not change its duty
Than.The dutycycle of above-mentioned first drive signal remains as γ1, and the dutycycle of the second drive signal remained on as γ2。
So the dutycycle of above-mentioned first drive signal and the second drive signal still meets above-mentioned expression formula and expression formula two.
Wherein, the first switch K1 and the second switch are IGBT (insulated gate bipolar transistor).
The compound full control that IGBT is made up of BJT (double pole triode) and MOSFET (insulating gate type field effect tube)
Type voltage driven type power semiconductor.Its is known to the public, is only applied and added in PTC liquid herein
As controlling switch in hot device, repeat no more.
The structure of PTC liquid heater disclosed in this example is specifically solved with reference to Fig. 4, Fig. 5, Fig. 6 below
Release explanation.
Wherein, the first switch K1, second switch, the first drive circuit D1, the second drive circuit D2,
High-tension circuit V and controller C are arranged on a control panel 3.The first heating module P1 and second
Heating module P2 each PTC heating modules 1 are arranged on one built with the housing of coolant, are formed and heat dress
Put；The control panel 3 is arranged on the heater top, and the control panel 3 and the heater
Between isolated by an insulated heat part 2.
Wherein, the heater top is additionally provided with a battery lead plate, and the battery lead plate is by the heater
The electrode of each PTC heating modules 1 is electrically connected on the battery lead plate, and is drawn by the circuit being disposed thereon
Go out some electrode columns；The electrode column is electrically connected with the electric-controlled plate.Specifically, in this example, above-mentioned first
Switch K1 and the upper two pin C poles of second switch and E poles are each coupled electrically on above-mentioned electrode column, this
Electrode column in example is provided with 3, and one of electrode column is common electrode.Its first switch K1 and second is opened
The control end of pass is that grid (G poles) or base stage (B poles) are connected to above-mentioned first drive circuit D1 and second
Drive circuit D2.
Wherein, because above-mentioned insulated heat part 2 is typically made up of silicon rubber of insulated heat etc..It is not
It can be used for installing and fixing above-mentioned control panel 3, therefore, the lower section typically in control panel 3 is additionally provided with a boss
4, it is used for being fixedly mounted in the control panel 3, this example by the boss 4, the boss 4 is arranged on above-mentioned first
Switch the lower position of K1 and second switch.
Above-mentioned control panel 3, insulated heat part 2 and boss 4 and the heater block positioned at bottom pass through spiral shell
Silk fastening.In this example, the concrete structure of above-mentioned PTC liquid heater is not particularly limited, and it can also be adopted
With other suitable arrangements, if it include above-mentioned first heating module P1, the second heating module P2,
First switch K1, second switch, the first drive circuit D1, the second drive circuit D2, high-tension circuit V and
Controller C.
As improved mode, as shown in figure 4, the PTC heating modules 1 in the first heating module P1
With the interspersed arrangement of PTC heating modules 1 in the second heating module P2, i.e., by shown in Fig. 4, each PTC
Heating module 1 is arranged by the way of n1, m1, n2, m2, n3, m3, n4, m4, n5.In this way,
It causes the first heating module P1 to carry out more uniform heat transfer to the second heating module P2, so that second
Each PTC heating modules 1 in heating module P2 are uniformly heated.
The present invention provides PTC liquid heater and only divides two gears, only need to be by each 1 point of PTC heating modules
For the first heating module P1 and the second heating module P2, PWM control modes are passed through using two controlling switches
The first heating module P1 and the second heating module P2 are controlled, cost is greatlyd save.Its control mode is compatible
The product platform of the PTC liquid heater of various different capacities, more conducively different structure, different model,
High-power PTC liquid heater control cabinet size is reduced, space is saved.By above-mentioned using two grades of packets
Plus the mode of PWM controls, rush of current can be reduced, current peak point is effectively prevented so that it is controlled
Mode processed is safer.Realize gear infinitely to divide, realize electrodeless temperature control, Temperature jump is linearly passed
Increase or successively decrease, comfortableness is fabulous.
Embodiment 2
This example will carry out specific to the method for heating and controlling of the above-mentioned PTC liquid heater disclosed in embodiment 1
Illustrate, the method for heating and controlling comprises the following steps：
As shown in fig. 7, controller C receives the PWM temperature signals；Specifically, example 1 is performed as described above
Described in, the PWM temperature signals come from ACCU.
Need to understand herein, it is dynamic process that controller C, which receives PWM temperature signals, and it is in setting
Persistently Current Temperatures T1 and air conditioning exhausting speed are sampled in cycle, and user in real input set
Put temperature T0.That is, follow-up sending the first logic to the first drive circuit D1 and the second drive circuit D2
It is also dynamically to follow above-mentioned PWM temperature signals to be adjusted when signal and the second logical signal.
The PWM temperature signals are converted into the first dutycycle γ by it1The first logical signal and have
Second dutycycle γ2The second logical signal；The reduction formula is expression formula one and expression formula two.
And first logical signal is sent to the first drive circuit D1, the second logical signal is sent to
Two drive circuit D2；
First drive circuit D1 receives the first logical signal, and the first drive signal is exported to first switch K1,
The break-make of the first switch K1 is controlled, to realize the first heating module P1 break-make；Second drive circuit
D2 receives the second logical signal, and the second drive signal is exported to second switch, controls the logical of the second switch
It is disconnected, to realize the second heating module P2 break-make；
Wherein, the first dutycycle γ of the first logical signal1With the second dutycycle γ of the second logical signal2Meet
Following expression：
Wherein, as γ in above-mentioned expression formula1、γ2When numerical value is more than or equal to 1,1 is identified as；γ in expression formula1、
γ2When numerical value is less than or equal to 0,0 is identified as, and controller C is sent to the first of the first drive circuit D1 and patrolled
Collect signal and the second drive circuit D2 the second logical signal delay preset time t.
Specifically, the Current Temperatures that its setting temperature T0 inputted according to its user and temperature sensor are detected
T1 difference is more than or equal to 0, less than a certain predetermined threshold value | TA | when, the heating power needed for representing it is relatively small,
At this moment, it is only necessary to start the first heating module P1 and heated, now, it specifically includes following steps：
SA, low-power heating stepses：Total dutycycle γ of the PWM temperature signals meets following expression：
First heating module P1 is to meet heating demand, only starts the first drive module and drives the first heating module
P1 works, and the second heating module P2 does not work；The first of the first logical signal that now controller C is sent
Dutycycle γ1With the second dutycycle γ of the second logical signal2Meet following expression：
Wherein, γ is worked as1When >=1, γ1=1；
γ2=0；
Second dutycycle γ of the second logical signal2=0, namely its second heating module P2 do not work, now,
After delay preset time t, it, which is remained on, remains 0, persistently keeps second heating module P2 not
Work.
When setting temperature T0 and temperature sensor that its user inputs the Current Temperatures T1 detected difference are more than
A certain predetermined threshold value | TA | when, represent that the first heating module P1 can not meet heating demand, represent that first heats
Module P1 not enough meets heating demand, also needs to start driving the second heating module P2 work of the second drive module；
SB, high power heating stepses：The total dutycycle γ for the PWM temperature signals that the controller is received
Meet following expression：
Now the first dutycycle γ of the first logical signal1Meet following expression：
γ1=1；
First heating module P1 is first carried out after full shelves work, delay preset time t, starts the second heating module
P2 works；Second dutycycle γ of the second logical signal that now controller C is sent2Meet following expression：
Further, also comprise the following steps：
SC, cooling step：The current temperature detected as setting temperature T0 and temperature sensor that its user inputs
When the difference for spending T1 is less than 0, represents now without heating, cooling is needed on the contrary；
Now, total dutycycle γ=0 for the PWM temperature signals that controller C is received；Controller C is sent
First dutycycle γ of the first logical signal1Meet following expression：γ1=0；
Turn off the first heating module P1；
After preset time t, the second dutycycle γ of the second logical signal that controller C is sent2Meet as follows
Expression formula：γ2=0；
Turn off the second heating module P2.
Wherein, the preset time t is typically rule of thumb obtained, and it can be extrapolated by way of experiment
Rational value, such as be 5 seconds.
The method for heating and controlling provided using the present invention, its basis has total dutycycle γ PWM temperature signals,
The first logical signal and the second logical signal are sent accordingly to the first drive circuit D1 and the second drive circuit D2,
Controller C is sent to the first drive circuit D1 the first logical signal and the second of the second drive circuit D2 is patrolled
Collect signal delay preset time t.In this way, when the preset temperature and smaller Current Temperatures difference that its needs is heated,
The first heating module P1 can be only enabled, when preset temperature and the Current Temperatures difference for needing to heat are larger,
The first heating module P1 can first be started, the second heating module P2, warp are preheated by the first heating module P1
After the preset time t that is delayed, restart the second heating module P2, when needing cooling after product work, take elder generation
The first heating module P1 is disconnected, then controls what the second heating module P2 disconnected again through being delayed after preset time t
Mode realizes cooling.In this way, it is simple using possible caused by PWM control modes to evade to realize Discrete control
The high peak current risk of appearance.It is above-mentioned using two grades packet plus PWM control by way of, reduce electric current
Impact, can effectively prevent current peak point so that its control mode is safer.Realize gear
It is unlimited to divide, electrodeless temperature control is realized, the linear increasing or decreasing of Temperature jump, comfortableness is fabulous.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in this hair
Any modifications, equivalent substitutions and improvements made within bright spirit and principle etc., should be included in the present invention
Protection domain within.
Claims (14)
1. a kind of PTC liquid heater, it is characterised in that including the first heating module, the second heated mould
Group, first switch, second switch, the first drive circuit, the second drive circuit, high-tension circuit and control
Device；
First heating module includes x PTC heating module in parallel；Second heating module includes parallel connection
Y PTC heating module；
It is that first heating module and second heating module provide high-tension electricity that the high-tension circuit, which is used for,；
First switch is serially connected between the high-tension circuit and first heating module, second switch concatenation
It is connected between the high-tension circuit and second heating module；
The controller is used to receive the PWM temperature signals with total dutycycle γ, by the PWM temperature
Control signal is converted into the first dutycycle γ1The first logical signal and with the second dutycycle γ2Second
Logical signal, and first logical signal is sent to the first drive circuit, the second logical signal is sent out
Give the second drive circuit；And controller is sent to the first logical signal of the first drive circuit and second and driven
The second logical signal delay preset time t of dynamic circuit；
First drive circuit input is connected to controller, for receiving first logical signal；Output
The control end of the end connection first switch, for there is the first dutycycle γ to first switch output1
The first drive signal, to control the break-make of the first switch；
The input of second drive circuit is connected to controller, for receiving second logical signal；It is defeated
Go out the control end of the end connection second switch, for there is the second dutycycle to second switch output
γ2The second drive signal, to control the break-make of the second switch.
2. PTC liquid heater according to claim 1, it is characterised in that the PWM temperature
The Current Temperatures T1 that control signal is detected according to the setting temperature T0 and temperature sensor that are inputted including user
Parameter generation inside.
3. PTC liquid heater according to claim 2, it is characterised in that the PWM temperature
The Current Temperatures T1 that control signal is detected according to the setting temperature T0, temperature sensor that are inputted including user
And the parameter generation including air conditioning exhausting speed.
4. PTC liquid heater according to claim 3, it is characterised in that x≤y.
5. PTC liquid heater according to claim 4, it is characterised in that the first logical signal
The first dutycycle γ1With the second dutycycle γ of the second logical signal2Meet following expression：
<mrow>
<msub>
<mi>&gamma;</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<mi>&gamma;</mi>
<mo>&CenterDot;</mo>
<mfrac>
<mrow>
<mi>x</mi>
<mo>+</mo>
<mi>y</mi>
</mrow>
<mi>x</mi>
</mfrac>
<mo>;</mo>
</mrow>
<mrow>
<msub>
<mi>&gamma;</mi>
<mn>2</mn>
</msub>
<mo>=</mo>
<mrow>
<mo>(</mo>
<mi>&gamma;</mi>
<mo>-</mo>
<mfrac>
<mi>x</mi>
<mrow>
<mi>x</mi>
<mo>+</mo>
<mi>y</mi>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>&CenterDot;</mo>
<mfrac>
<mrow>
<mi>x</mi>
<mo>+</mo>
<mi>y</mi>
</mrow>
<mi>y</mi>
</mfrac>
<mo>;</mo>
</mrow>
Wherein, as γ in above-mentioned expression formula1、γ2When numerical value is more than or equal to 1,1 is identified as；γ in expression formula1、
γ2When numerical value is less than or equal to 0,0 is identified as.
6. PTC liquid heater according to claim 1, it is characterised in that the first switch
It is IGBT with the second switch.
7. PTC liquid heater according to claim 6, it is characterised in that the first switch,
Second switch, the first drive circuit, the second drive circuit, high-tension circuit and controller are arranged at a control
In making sheet.
8. PTC liquid heater according to claim 7, it is characterised in that first heating
Module and the second heating module are arranged on one built with the housing of coolant, form heater；It is described
Control panel is arranged on the heater top, and passes through one between the control panel and the heater
Insulated heat part is isolated.
9. PTC liquid heater according to claim 8, it is characterised in that the heater
Top is additionally provided with a battery lead plate, and the battery lead plate is by the electrode of each PTC heating modules on the heater
It is electrically connected on the battery lead plate, and some electrode columns is drawn by the circuit being disposed thereon；The electricity
Pole is electrically connected with the electric-controlled plate.
10. PTC liquid heater according to claim 1, it is characterised in that first heating
The interspersed arrangement of the PTC heating modules in PTC heating modules and the second heating module in module.
11. a kind of method for heating and controlling of PTC liquid heater, it is characterised in that the PTC liquid
Heater is the PTC liquid heater described in any one in claim 1-10；The computer heating control side
Method comprises the following steps：
Controller connects the PWM temperature signals, and the PWM temperature signals are converted into
One dutycycle γ1The first logical signal and with the second dutycycle γ2The second logical signal, and will be described
First logical signal is sent to the first drive circuit, and the second logical signal is sent into the second drive circuit；
First drive circuit receives the first logical signal, and the first drive signal, control are exported to first switch
The break-make of the first switch, to realize the break-make of the first heating module；Second drive circuit receives second
Logical signal, the second drive signal is exported to second switch, the break-make of the second switch is controlled, with reality
The break-make of existing second heating module.
12. the method for heating and controlling of PTC liquid heater according to claim 11, its feature exists
In specifically including following steps：
SA, low-power heating stepses：Total dutycycle γ of the PWM temperature signals meets and is expressed as below
Formula：
Now, the first heating module is to meet heating demand, only starts the first drive module driving first and adds
Thermal module works, and the second heating module does not work；The first of the first logical signal that now controller is sent
Dutycycle γ1With the second dutycycle γ of the second logical signal2Meet following expression：
Wherein, γ is worked as1When >=1, γ1=1；
γ2=0；
SB, high power heating stepses：Total dutycycle γ of the PWM temperature signals meets and is expressed as below
Formula：
Now, now the first dutycycle γ of the first logical signal1Meet following expression：
γ1=1；
First heating module is first carried out after full shelves work, delay preset time t, starts the second heating module work
Make；Second dutycycle γ of the second logical signal that now controller is sent2Meet following expression：
<mrow>
<msub>
<mi>&gamma;</mi>
<mn>2</mn>
</msub>
<mo>=</mo>
<mrow>
<mo>(</mo>
<mi>&gamma;</mi>
<mo>-</mo>
<mfrac>
<mi>x</mi>
<mrow>
<mi>x</mi>
<mo>+</mo>
<mi>y</mi>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>&CenterDot;</mo>
<mfrac>
<mrow>
<mi>x</mi>
<mo>+</mo>
<mi>y</mi>
</mrow>
<mi>y</mi>
</mfrac>
<mo>.</mo>
</mrow>
3
13. the method for heating and controlling of PTC liquid heater according to claim 12, its feature exists
In also comprising the following steps：
SC, cooling step：Total dutycycle γ=0 for the PWM temperature signals that controller is received；Controller
First dutycycle γ of the first logical signal sent1Meet following expression：γ1=0；
Turn off the first heating module；
After preset time t, the second dutycycle γ of the second logical signal that controller is sent2Meet such as following table
Up to formula：γ2=0；
Turn off the second heating module.
14. the method for heating and controlling of PTC liquid heater according to claim 11, its feature exists
In the preset time t is 5 seconds.
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| CN107632647A (en) * | 2017-11-07 | 2018-01-26 | 厦门盈趣科技股份有限公司 | Temperature control system and method |
| CN108592408A (en) * | 2018-06-19 | 2018-09-28 | 安徽省宁国市天成电气有限公司 | A kind of ptc heater heating component |
| CN108716767A (en) * | 2018-06-19 | 2018-10-30 | 安徽省宁国市天成电气有限公司 | A kind of PTC liquid heater assembly |
| CN109028547A (en) * | 2018-06-19 | 2018-12-18 | 安徽省宁国市天成电气有限公司 | A kind of PTC liquid heating control system |
| CN110962537A (en) * | 2019-11-18 | 2020-04-07 | 珠海格力电器股份有限公司 | New energy bus air conditioner PTC heater starting control method, computer readable storage medium and air conditioner |
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| CN111208861A (en) * | 2020-01-15 | 2020-05-29 | 重庆超力高科技股份有限公司 | PTC power control method and device |
| CN112937252A (en) * | 2021-01-28 | 2021-06-11 | 浙江合众新能源汽车有限公司 | Method for designing PTC energy-saving control logic of wind side of electric air conditioner |
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| CN113867436A (en) * | 2021-09-17 | 2021-12-31 | 深圳市海一电器有限公司 | Intelligent cooking method and system |
| CN114326865A (en) * | 2020-09-27 | 2022-04-12 | 比亚迪股份有限公司 | Control system and vehicle of heater |
| CN114537089A (en) * | 2020-11-26 | 2022-05-27 | 比亚迪股份有限公司 | Control system and vehicle of heater |
| CN116074995A (en) * | 2023-03-07 | 2023-05-05 | 深圳艾为电气技术有限公司 | Heating circuit of PTC heater and heating control method thereof |
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| CN107632647A (en) * | 2017-11-07 | 2018-01-26 | 厦门盈趣科技股份有限公司 | Temperature control system and method |
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| CN110962537A (en) * | 2019-11-18 | 2020-04-07 | 珠海格力电器股份有限公司 | New energy bus air conditioner PTC heater starting control method, computer readable storage medium and air conditioner |
| CN110962537B (en) * | 2019-11-18 | 2021-10-22 | 珠海格力电器股份有限公司 | Air conditioner PTC heater starting control method, medium and air conditioner |
| CN111208861A (en) * | 2020-01-15 | 2020-05-29 | 重庆超力高科技股份有限公司 | PTC power control method and device |
| CN114326865A (en) * | 2020-09-27 | 2022-04-12 | 比亚迪股份有限公司 | Control system and vehicle of heater |
| CN114537089A (en) * | 2020-11-26 | 2022-05-27 | 比亚迪股份有限公司 | Control system and vehicle of heater |
| CN112937252A (en) * | 2021-01-28 | 2021-06-11 | 浙江合众新能源汽车有限公司 | Method for designing PTC energy-saving control logic of wind side of electric air conditioner |
| CN113059983A (en) * | 2021-03-26 | 2021-07-02 | 奇瑞新能源汽车股份有限公司 | Heating circuit of electric automobile and electric automobile |
| CN113059983B (en) * | 2021-03-26 | 2022-07-15 | 奇瑞新能源汽车股份有限公司 | Heating circuit of electric automobile and electric automobile |
| CN113867436A (en) * | 2021-09-17 | 2021-12-31 | 深圳市海一电器有限公司 | Intelligent cooking method and system |
| WO2023173591A1 (en) * | 2022-03-18 | 2023-09-21 | 宁波西健医疗技术研究有限公司 | Perfusion liquid heater and control method therefor |
| CN116074995A (en) * | 2023-03-07 | 2023-05-05 | 深圳艾为电气技术有限公司 | Heating circuit of PTC heater and heating control method thereof |
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