CN110086454A - A kind of overloading control device of power module - Google Patents
A kind of overloading control device of power module Download PDFInfo
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- CN110086454A CN110086454A CN201910294629.4A CN201910294629A CN110086454A CN 110086454 A CN110086454 A CN 110086454A CN 201910294629 A CN201910294629 A CN 201910294629A CN 110086454 A CN110086454 A CN 110086454A
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- overload
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/14—Modifications for compensating variations of physical values, e.g. of temperature
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K2017/0806—Modifications for protecting switching circuit against overcurrent or overvoltage against excessive temperature
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0081—Power supply means, e.g. to the switch driver
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Abstract
The invention discloses a kind of overloading control devices of power module, including pulsewidth comparison circuit and overload control circuit；Wherein: the input terminal of pulsewidth comparison circuit is connect with the output end for controlling the driving circuit of the opening state of switching tube in power module, and the output end of pulsewidth comparison circuit and the input terminal of overload control circuit connect；Pulsewidth comparison circuit is used to generate overload signal when the pulsewidth for the driving signal that driving circuit exports is greater than default pulse width threshold；Overload control circuit is used to determine that power module is in overload after receiving overload signal, and generates the control signal of the temperature for reducing power module in output end.As it can be seen that the application only can detect whether power module works in overload by obtaining the pulsewidth of driving signal without temperature sensor.Compared to multiple temperature sensors, cost is relatively low for the circuit structure of the application, and the overload situations of the power module detected are more accurate.
Description
Technical field
The present invention relates to power module overload detection fields, more particularly to a kind of overloading control device of power module.
Background technique
Currently, when power module works normally, it includes the loss of power device (such as switching tube) can cause function
The fever of rate device, it is natural air cooled to be unable to satisfy radiating requirements, it usually needs additional when calorific value is more than certain value
Refrigeration system forces power device to cool down, to guarantee the normal work of power module.In the prior art, usually in power device institute
Multiple radiators on the corresponding radiator installing multiple temperature sensors, being detected by temperature sensor temperature change come
The operation of refrigeration system is controlled, to meet the radiating requirements of power device.But the higher cost of multiple temperature sensors, and
Some power devices make on radiator there are the signal that dv/dt variable quantity is big, and the detection signal of temperature sensor is vulnerable to end of making an uproar
(the big definition of dv/dt variable quantity is end of making an uproar) interference, leads to detection inaccuracy, to influence the control of refrigeration system；In addition,
Under the lower environment of temperature, power module has worked to overload (needing refrigeration system that power device is forced to cool down at this time),
But due to the influence of environment temperature, the radiator temperature that temperature sensor detects not is the actual temperature of power device, at this time
Testing result be likely to be that power module does not reach overload also, to reduce the accuracy of detection.
Therefore, how to provide a kind of scheme of solution above-mentioned technical problem is that those skilled in the art needs to solve at present
The problem of.
Summary of the invention
The object of the present invention is to provide a kind of overloading control devices of power module, only logical without temperature sensor
The pulsewidth for crossing acquisition driving signal can detect whether power module works in overload, and cost is relatively low for circuit structure, and
The overload situations of the power module of detection are more accurate.
In order to solve the above technical problems, the present invention provides a kind of overloading control device of power module, including peak pulse duration
Compared with circuit and overload control circuit；Wherein:
The input terminal of the pulsewidth comparison circuit and the driving electricity for controlling the opening state of switching tube in power module
The output end on road connects, and the output end of the pulsewidth comparison circuit is connect with the input terminal of the overload control circuit；
The pulsewidth comparison circuit is used to be greater than default pulsewidth threshold when the pulsewidth of the driving signal of driving circuit output
Overload signal is generated when value；The overload control circuit is used to determine at the power module after receiving the overload signal
The control signal of the temperature for reducing the power module is generated in overload, and in output end.
Preferably, the pulsewidth comparison circuit includes integrating circuit and first comparator；Wherein:
Input terminal of the input terminal of the integrating circuit as the pulsewidth comparison circuit, the output end of the integrating circuit
It being connect with the input negative terminal of the first comparator, the input anode of the first comparator accesses default first reference voltage,
Output end of the output end of the first comparator as the pulsewidth comparison circuit；Wherein, the time of the integrating circuit is normal
Number is greater than preset time constant.
Preferably, the integrating circuit includes first resistor and first capacitor；Wherein:
Input terminal of the first end of the first resistor as the integrating circuit, the second end of the first resistor and institute
State the first end connection of first capacitor, output end of the common end as the integrating circuit, the second end of the first capacitor
Ground connection.
Preferably, the pulsewidth comparison circuit further include:
The filter circuit that first end is connect with the input anode of the first comparator, second end is grounded, for filtering out
State the interference signal of the input anode input of first comparator.
Preferably, the filter circuit includes second resistance and the second capacitor；Wherein:
The first end of the second resistance is connect with the first end of second capacitor, and common end is as the filtered electrical
The first end on road, the second end of the second resistance are connect with the second end of second capacitor, and common end is as the filter
The second end of wave circuit.
Preferably, the overload control circuit includes the second comparator, pull-up resistor, 3rd resistor and the first direct current
Source；Wherein:
Input terminal of the input negative terminal of second comparator as the overload control circuit, second comparator
It inputs anode and accesses default second reference voltage, the output end of second comparator first end with the pull-up resistor respectively
It is connected with the first end of the 3rd resistor, the output end of the second end of the pull-up resistor and first DC power supply connects
It connects, output end of the second end of the 3rd resistor as the overload control circuit.
Preferably, the overloading control device further include:
Input terminal is connect with the output end of the first comparator, the input negative terminal of output end and second comparator connects
The delay circuit connect compares for being input to described second after the output signal delay preset time by the first comparator
Device.
Preferably, the delay circuit includes the 4th resistance, third capacitor, diode and the second DC power supply；Wherein:
The first end of 4th resistance is connect with the anode of the first end of the third capacitor and the diode respectively,
Input terminal and output end of its common end as the delay circuit, the second end of the 4th resistance respectively with the diode
Cathode connected with the output end of second DC power supply, the second end of third capacitor ground connection.
Preferably, the overloading control device further include:
First end is connect with the output end of the first comparator, second end is connect with the input terminal of the delay circuit
Current-limiting circuit.
Preferably, which further includes pulsewidth stage circuit；Wherein:
The input terminal of the pulsewidth stage circuit is connect with the output end of the driving circuit, the pulsewidth stage circuit
Output end is connect with the input terminal of the overload control circuit；
The pulsewidth stage circuit is used for when the pulsewidth of the driving signal is greater than the default pulse width threshold, according to pre-
If multistage pulsewidth section determines the current pulse width grade of the driving signal；
Correspondingly, the overload control circuit is specifically used for presetting the pulsewidth grade of the driving signal and the function
Corresponding relationship between the cooling grade of rate module；Determine that the power module is in overload after receiving the overload signal
State, and target cooling grade corresponding with the current pulse width grade is determined according to the corresponding relationship, and raw in output end
Signal is controlled at cooling corresponding with target cooling grade.
The present invention provides a kind of overloading control devices of power module, including pulsewidth comparison circuit and premature beats electricity
Road；Wherein: the input terminal of pulsewidth comparison circuit with for controlling the driving circuit of the opening state of switching tube in power module
Output end connection, the output end of pulsewidth comparison circuit and the input terminal of overload control circuit connect；Pulsewidth comparison circuit is for working as
The pulsewidth of the driving signal of driving circuit output generates overload signal when being greater than default pulse width threshold；Overload control circuit is used for
It determines that power module is in overload after receiving overload signal, and generates the temperature for reducing power module in output end
Control signal.
The application embodies power module in view of the pulsewidth of the driving signal of the corresponding driving circuit output of power module
Band carrying capacity (pulsewidth numerical value is bigger, and the band carrying capacity of power module is bigger), the power consumption that power module is determined with carrying capacity of power module,
Determine the calorific value of power module, so, the application only passes through the pulsewidth of acquisition driving signal without temperature sensor
It can detect whether power module works in overload.As it can be seen that compared to multiple temperature sensors, the circuit knot of the application
Cost is relatively low for structure, and the overload situations of the power module detected are more accurate.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of the overloading control device of power module provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the overloading control device of another power module provided in an embodiment of the present invention.
Specific embodiment
Core of the invention is to provide a kind of overloading control device of power module, only logical without temperature sensor
The pulsewidth for crossing acquisition driving signal can detect whether power module works in overload, and cost is relatively low for circuit structure, and
The overload situations of the power module of detection are more accurate.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 is please referred to, Fig. 1 is a kind of structural representation of the overloading control device of power module provided in an embodiment of the present invention
Figure.
The overloading control device of the power module includes: pulsewidth comparison circuit 1 and overload control circuit 2；Wherein:
The input terminal of pulsewidth comparison circuit 1 with for controlling the driving circuit of the opening state of switching tube in power module
Output end connection, the output end of pulsewidth comparison circuit 1 are connect with the input terminal of overload control circuit 2；
Pulsewidth comparison circuit 1 is used to generate when the pulsewidth for the driving signal that driving circuit exports is greater than default pulse width threshold
Overload signal；Overload control circuit 2 is used to determine that power module is in overload after receiving overload signal, and is exporting
End generates the control signal of the temperature for reducing power module.
It should be noted that the default of the application sets in advance, it is only necessary to which setting is primary, unless according to practical feelings
Condition needs to modify, and does not otherwise need to reset.
Specifically, the drive of the corresponding driving circuit of power module (opening state of switching tube in control power module) output
The pulsewidth of dynamic signal (i.e. driving square wave) can embody the band carrying capacity of power module, and the band carrying capacity of power module determines power module
Power consumption, that is, determine power module calorific value.When the pulsewidth numerical value of driving signal is bigger, illustrate the band carrying capacity of power module
Bigger, the power consumption of power module is bigger, and the calorific value of power module is more.
Due to when the calorific value of power module is more than permitted calorific capacity (i.e. power module work in overload),
It is natural air cooled to be unable to satisfy radiating requirements, it usually needs to cool down to power device in power module, to guarantee power mould
The normal work of block.So a pwm value (setting principle: when the driving signal of driving circuit output is arranged in the application in advance
Pulsewidth when being greater than set pwm value, the calorific value of power module is more than permitted calorific capacity, and power module work is being overloaded
State；When the pulsewidth of the driving signal of driving circuit output is not more than set pwm value, the calorific value of power module is no more than
Permitted calorific capacity, power module do not overload).
Based on this, the overloading control device of the application includes pulsewidth comparison circuit 1 and overload control circuit 2, and work is former
Reason are as follows: pulsewidth comparison circuit 1 makes comparisons the pulsewidth for the driving signal that driving circuit exports with set pwm value, if driving signal
Pulsewidth be greater than set pwm value, illustrate power module work in overload, then generate overload signal, and output this to
Control circuit 2 is carried, in order to which overload control circuit 2 is after receiving overload signal, is generated in itself output end for reducing function
The control signal of the temperature of rate module, and control signal correspondence is input to controlled device, to reduce power using controlled device
The temperature of device；If the pulsewidth of driving signal be not more than set pwm value, illustrate that power module does not overload, it is natural air cooled at this time
Meet radiating requirements, without cooling down to power device, does not then generate overload signal, overload control circuit 2 does not play overload control at this time
Production is used.
As it can be seen that this application provides a kind of band carrying capacity for determining power module by detection driving pulsewidth, thus in power
The overloading control device that the temperature of power device is reduced when module is overloaded, is not necessarily to temperature sensor, and cost is relatively low for circuit structure, and
It controls more accurate.
In addition, can choose refrigerating plant (such as wind in the application for reducing the controlled device of the temperature of power module
Machine), specific control mode can be with are as follows: when power module work is in overload, overload control circuit 2 controls refrigerating plant fortune
Row；When power module does not overload, it is out of service that overload control circuit 2 controls refrigerating plant.Certainly, the controlled device of the application
Also some devices (such as motor, relay, by controlling motor, relay with carrying capacity for influencing power module be can choose
Deng switching signal, realize power module overload when, reduce drive pulsewidth by way of reduce power module band carry
Amount), the application is not particularly limited herein.
The present invention provides a kind of overloading control devices of power module, including pulsewidth comparison circuit and premature beats electricity
Road；Wherein: the input terminal of pulsewidth comparison circuit with for controlling the driving circuit of the opening state of switching tube in power module
Output end connection, the output end of pulsewidth comparison circuit and the input terminal of overload control circuit connect；Pulsewidth comparison circuit is for working as
The pulsewidth of the driving signal of driving circuit output generates overload signal when being greater than default pulse width threshold；Overload control circuit is used for
It determines that power module is in overload after receiving overload signal, and generates the temperature for reducing power module in output end
Control signal.
The application embodies power module in view of the pulsewidth of the driving signal of the corresponding driving circuit output of power module
Band carrying capacity (pulsewidth numerical value is bigger, and the band carrying capacity of power module is bigger), the power consumption that power module is determined with carrying capacity of power module,
Determine the calorific value of power module, so, the application only passes through the pulsewidth of acquisition driving signal without temperature sensor
It can detect whether power module works in overload.As it can be seen that compared to multiple temperature sensors, the circuit knot of the application
Cost is relatively low for structure, and the overload situations of the power module detected are more accurate.
Referring to figure 2., Fig. 2 is that the structure of the overloading control device of another power module provided in an embodiment of the present invention is shown
It is intended to.The overloading control device is on the basis of the above embodiments:
As a kind of optionally embodiment, pulsewidth comparison circuit 1 includes integrating circuit and first comparator D1；Wherein:
Input terminal of the input terminal of integrating circuit as pulsewidth comparison circuit 1, the output end of integrating circuit is compared with first
The input negative terminal of device D1 connects, and the input anode of first comparator D1 accesses default first reference voltage, first comparator D1's
Output end of the output end as pulsewidth comparison circuit 1；Wherein, the time constant of integrating circuit is greater than preset time constant.
Specifically, the pulsewidth comparison circuit 1 of the application includes integrating circuit and first comparator D1, its working principle is that:
The driving signal that the integrating circuit of the application exports driving circuit integrates.It should be noted that integral electricity
The time constant on road should be greater than certain time constant, so that the waveform of integrating circuit output tends towards stability, to make subsequent conditioning circuit
Realize gentle control.That is, output waveform is more gentle when the time constant of integrating circuit takes the larger value, at this time may be used
To regard the output waveform approximation of integrating circuit as driving signal corresponding DC component.When the pulsewidth of driving signal is bigger
When, the voltage value of the waveform of integrating circuit output is bigger, so that the voltage value for being input to the input negative terminal of first comparator D1 is got over
Greatly.
Due to set first reference voltage Vref, the 1 (setting principle: integral electricity of the input anode input of first comparator D1
When the voltage value of the waveform of road output is greater than the first reference voltage, it is believed that the pulsewidth of driving signal is greater than set pwm value, i.e. function
The calorific value of rate module is more than permitted calorific capacity, needs to cool down to power device at this time；The wave of integrating circuit output
The voltage value of shape be not more than the first reference voltage when, it is believed that the pulsewidth of driving signal be not more than set pwm value, at this time without pair
Power device cools down), and when the voltage value of the waveform of integrating circuit output is not more than set first reference voltage, the first ratio
High level is exported compared with device D1；When the voltage value of the waveform of integrating circuit output is greater than set first reference voltage, first comparator
D1 exports low level.So the overload control circuit 2 of the application first comparator D1 export high level when, to controlled device
Do not play control action；When first comparator D1 exports low level, controlled device is controlled to cool down to power device.
As one kind, optionally embodiment, integrating circuit include first resistor R1 and first capacitor C1；Wherein:
Input terminal of the first end of first resistor R1 as integrating circuit, the second end and first capacitor C1 of first resistor R1
First end connection, output end of the common end as integrating circuit, the second end of first capacitor C1 is grounded.
Specifically, the integrating circuit of the application includes first resistor R1 and first capacitor C1.It should be noted that the first electricity
The value of resistance R1 and first capacitor C1 should ensure that the time constant of integrating circuit is greater than certain time constant.
As a kind of optionally embodiment, pulsewidth comparison circuit 1 further include:
The filter circuit that first end is connect with the input anode of first comparator D1, second end is grounded, for filtering out first
The interference signal of the input anode input of comparator D1.
Further, the pulsewidth comparison circuit 1 of the application further includes filter circuit, for filtering out the defeated of first comparator D1
Enter the interference signal of anode input, so that the stability of the first reference voltage signal of first comparator D1 input is improved, into
And improve the accuracy and reliability of pulsewidth comparison circuit 1.
As one kind, optionally embodiment, filter circuit include second resistance R2 and the second capacitor C2；Wherein:
The first end of second resistance R2 is connect with the first end of the second capacitor C2, common end as filter circuit first
End, the second end of second resistance R2 are connect with the second end of the second capacitor C2, second end of the common end as filter circuit.
Specifically, the filter circuit of the application includes second resistance R2 and the second capacitor C2, i.e., is filtered using RC filter circuit
Except the interference signal of the input anode input of first comparator D1.Certainly, the filter circuit of the application can also select other classes
The filter circuit of type, the application are not particularly limited herein.
As a kind of optionally embodiment, overload control circuit 2 includes the second comparator D2, pull-up resistor R, 3rd resistor
R3 and the first DC power supply；Wherein:
Input terminal of the input negative terminal of second comparator D2 as overload control circuit 2, the input of the second comparator D2 is just
Terminate into default second reference voltage, the output end of the second comparator D2 respectively with the first end and 3rd resistor of pull-up resistor R
The first end of R3 connects, and the second end of pull-up resistor R is connect with the output end of the first DC power supply, the second end of 3rd resistor R3
Output end as overload control circuit 2.
Specifically, the overload control circuit 2 of the application includes the second comparator D2, pull-up resistor R, 3rd resistor R3 and the
One DC power supply, its working principle is that:
The input anode of the second comparator D2 of the application inputs set second reference voltage Vref 2, in first comparator
When D1 exports high level, the second comparator D2 exports low level, and overload control circuit 2 does not play premature beats at this time；?
When one comparator D1 exports low level, the second comparator D2 exports high level, and (output voltage of the second comparator D2 is pulled up electricity
Resistance R is drawn high to the output voltage VCC of the first DC power supply, then control signal is obtained after 3rd resistor R3 current limliting), this control letter
Number control controlled device, thus make controlled device enter reduce power device temperature state.
As a kind of optionally embodiment, the overloading control device further include:
Input terminal is connect with the output end of first comparator D1, output end is connect with the input negative terminal of the second comparator D2
Delay circuit, for being input to the second comparator D2 after the output signal of first comparator D1 is postponed preset time.
Further, the overloading control device of the application further includes delay circuit, can believe the output of first comparator D1
Number delay is input to the second comparator D2 after a certain period of time, to provide enough response times for controlled device.
As a kind of optionally embodiment, delay circuit includes the 4th resistance R4, third capacitor C3, diode D and second
DC power supply；Wherein:
The first end of 4th resistance R4 is connect with the anode of the first end of third capacitor C3 and diode D respectively, public
The input terminal and output end as delay circuit are held, the second end of the 4th resistance R4 is straight with the cathode of diode D and second respectively
The output end in galvanic electricity source connects, the second end ground connection of third capacitor C3.
Specifically, the delay circuit of the application includes the 4th resistance R4, third capacitor C3, diode D and the second direct current
Source, wherein the delay time of the value of the 4th resistance R4 and third capacitor C3 decision delay circuit；Diode D can realize third
The repid discharge of capacitor C3, so that delays time to control is realized in cooperation jointly.
As a kind of optionally embodiment, the overloading control device further include:
First end connect with the output end of first comparator D1, the current limliting electricity of the input terminal connection of second end and delay circuit
Road.
Further, the control device of the application further includes current-limiting circuit, for limiting first comparator D1 and delay electricity
Current value between road on route, to improve the safety and reliability of overloading control device.Specifically, current limliting here
Current-limiting resistance R5 can be selected but be not limited only to circuit, and the application is not particularly limited herein.
As one kind, optionally embodiment, the overloading control device further include pulsewidth stage circuit；Wherein:
The input terminal of pulsewidth stage circuit and the output end of driving circuit connect, the output end and overload of pulsewidth stage circuit
The input terminal of control circuit 2 connects；
Pulsewidth stage circuit is used for when the pulsewidth of driving signal is greater than default pulse width threshold, according to default multistage pulsewidth area
Between determine driving signal current pulse width grade；
Correspondingly, overload control circuit 2 is specifically used for presetting the pulsewidth grade of driving signal and the drop of power module
Corresponding relationship between warm grade；It determines that power module is in overload after receiving overload signal, and is closed according to corresponding
System determines target cooling grade corresponding with current pulse width grade, and generates cooling corresponding with target cooling grade in output end
Control signal.
Further, the overloading control device of the application further includes pulsewidth stage circuit, its working principle is that:
In the case where the pulsewidth of driving signal is greater than default pulse width threshold, the overload control circuit 2 of the application controls quilt
Device is controlled to cool down to power device.It is understood that when the pwm value of driving signal is bigger, the hair of power module
Heat is more serious, and power module relatively serious for heat condition, the cooling effect of corresponding controlled device is answered much better.
Based on this, the application is classified the pulsewidth of driving signal, and the grade according to belonging to the pulsewidth of driving signal accordingly controls
The cooling grade of power module.
Specifically, the pulsewidth stage circuit of the application presets multistage pulsewidth section, such as pwm value A0- pwm value A1
(level-one pulsewidth section), pwm value A1- pwm value A2 (second level pulsewidth section), (the three-level pulsewidth area pwm value A2- pwm value A3
Between) ..., it can be set here are as follows: the pwm value in section is bigger, and the grade in pulsewidth section is higher, and set multistage pulsewidth section
Minimum pwm value enter corresponding minimum pwm value under controlled state not less than controlled device.Then, pulsewidth stage circuit root
Determine its current pulse width grade (for example, the current pulse width value of driving signal is in pwm value A0- arteries and veins according to the current pulse width of driving signal
Between width values A1, then the current pulse width grade of driving signal is level-one), and the current pulse width grade of driving signal was sent to
Carry control circuit 2.
It is preset due to overload control circuit 2 between the pulsewidth grade of driving signal and the cooling grade of power module
(the pulsewidth higher grade of driving signal, and the fever of power module is more serious for corresponding relationship；The cooling higher grade of power module,
Controlled device is better to the cooling effect of heating power device, i.e. controlled device is higher to the cooling degree of heating power device,
It is understood that the pulsewidth higher grade of driving signal, and the cooling grade Ying Yuegao of corresponding power module), so overload
Control circuit 2 can determine power module after receiving the current pulse width grade of driving signal, according to the two corresponding relationship
Target cooling grade, and generate cooling corresponding with target cooling grade in itself output end and control signal, according to cooling control
The cooling degree (when such as controlled device is blower, controlling the height gear of blower) of signal control controlled device processed, thus more
The rationally operation of control controlled device, guarantees the normal work of power module.
More specifically, the pulsewidth stage circuit of the application may include multiple comparators of setting different voltages reference value,
To realize the pulsewidth grade classification of driving signal, thus the low and high level control that overload control circuit 2 is exported according to multiple comparators
The cooling degree of controlled device processed.Alternatively, the pulsewidth stage circuit of the application can the pulsewidth numerical value to driving signal count
It calculates, to determine pulsewidth grade belonging to the pulsewidth of driving signal.As for the specific implementation of pulsewidth stage circuit, the application is herein not
It is particularly limited.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of overloading control device of power module, which is characterized in that including pulsewidth comparison circuit and overload control circuit；Its
In:
The input terminal of the pulsewidth comparison circuit with for controlling the driving circuit of the opening state of switching tube in power module
Output end connection, the output end of the pulsewidth comparison circuit are connect with the input terminal of the overload control circuit；
The pulsewidth comparison circuit is used for when the pulsewidth for the driving signal that the driving circuit exports is greater than default pulse width threshold
Generate overload signal；The overload control circuit is used to determine that the power module was in after receiving the overload signal
Load state, and the control signal of the temperature for reducing the power module is generated in output end.
2. the overloading control device of power module as described in claim 1, which is characterized in that the pulsewidth comparison circuit includes
Integrating circuit and first comparator；Wherein:
Input terminal of the input terminal of the integrating circuit as the pulsewidth comparison circuit, the output end of the integrating circuit and institute
The input negative terminal connection of first comparator is stated, the input anode of the first comparator accesses default first reference voltage, described
Output end of the output end of first comparator as the pulsewidth comparison circuit；Wherein, the time constant of the integrating circuit is big
In preset time constant.
3. the overloading control device of power module as claimed in claim 2, which is characterized in that the integrating circuit includes first
Resistance and first capacitor；Wherein:
Input terminal of the first end of the first resistor as the integrating circuit, the second end of the first resistor and described the
The first end of one capacitor connects, output end of the common end as the integrating circuit, the second end ground connection of the first capacitor.
4. the overloading control device of power module as claimed in claim 3, which is characterized in that the pulsewidth comparison circuit also wraps
It includes:
First end connect with the input anode of the first comparator, the filter circuit of second end ground connection, for filtering out described the
The interference signal of the input anode input of one comparator.
5. the overloading control device of power module as claimed in claim 4, which is characterized in that the filter circuit includes second
Resistance and the second capacitor；Wherein:
The first end of the second resistance is connect with the first end of second capacitor, and common end is as the filter circuit
First end, the second end of the second resistance are connect with the second end of second capacitor, and common end is as the filtered electrical
The second end on road.
6. the overloading control device of power module as claimed in claim 2, which is characterized in that the overload control circuit includes
Second comparator, pull-up resistor, 3rd resistor and the first DC power supply；Wherein:
Input terminal of the input negative terminal of second comparator as the overload control circuit, the input of second comparator
Anode accesses default second reference voltage, the output end of second comparator respectively with the first end of the pull-up resistor and institute
The first end connection of 3rd resistor is stated, the second end of the pull-up resistor is connect with the output end of first DC power supply, institute
State output end of the second end of 3rd resistor as the overload control circuit.
7. the overloading control device of power module as claimed in claim 6, which is characterized in that the overloading control device also wraps
It includes:
Input terminal is connect with the output end of the first comparator, output end is connect with the input negative terminal of second comparator
Delay circuit, for being input to second comparator after the output signal of the first comparator is postponed preset time.
8. the overloading control device of power module as claimed in claim 7, which is characterized in that the delay circuit includes the 4th
Resistance, third capacitor, diode and the second DC power supply；Wherein:
The first end of 4th resistance is connect with the anode of the first end of the third capacitor and the diode respectively, public
Input terminal and output end of the end as the delay circuit altogether, the second end of the 4th resistance yin with the diode respectively
Pole is connected with the output end of second DC power supply, the second end ground connection of the third capacitor.
9. the overloading control device of power module as claimed in claim 8, which is characterized in that the overloading control device also wraps
It includes:
The current limliting that first end is connect with the output end of the first comparator, second end is connect with the input terminal of the delay circuit
Circuit.
10. the overloading control device of power module as claimed in claims 1-9, which is characterized in that the overloading control device is also
Including pulsewidth stage circuit；Wherein:
The input terminal of the pulsewidth stage circuit is connect with the output end of the driving circuit, the output of the pulsewidth stage circuit
End is connect with the input terminal of the overload control circuit；
The pulsewidth stage circuit is used for when the pulsewidth of the driving signal is greater than the default pulse width threshold, according to default more
Grade pulsewidth section determines the current pulse width grade of the driving signal；
Correspondingly, the overload control circuit is specifically used for presetting the pulsewidth grade of the driving signal and the power mould
Corresponding relationship between the cooling grade of block；Determine that the power module is in overload shape after receiving the overload signal
State, and target cooling grade corresponding with the current pulse width grade is determined according to the corresponding relationship, and generate in output end
Cooling corresponding with target cooling grade controls signal.
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| CN201910294629.4A CN110086454B (en) | 2019-04-12 | 2019-04-12 | Overload control device of power module |
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| CN201910294629.4A CN110086454B (en) | 2019-04-12 | 2019-04-12 | Overload control device of power module |
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| EP0512631A2 (en) * | 1991-05-09 | 1992-11-11 | Consorzio per la Ricerca sulla Microelettronica nel Mezzogiorno - CoRiMMe | Circuit for protection against the increase of the output current for an integrated circuit comprising a power device driving a resonant load connected to a power supply |
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|---|---|
| CN110086454B (en) | 2022-11-18 |
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