CN108988288A - Load short-circuit protection circuit and method and circuit system - Google Patents
Load short-circuit protection circuit and method and circuit system Download PDFInfo
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- CN108988288A CN108988288A CN201810683325.2A CN201810683325A CN108988288A CN 108988288 A CN108988288 A CN 108988288A CN 201810683325 A CN201810683325 A CN 201810683325A CN 108988288 A CN108988288 A CN 108988288A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/083—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for three-phase systems
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Abstract
The present invention relates to a kind of load short-circuit protection circuit and method and circuit system, the load short-circuit protection circuit includes: circuit parameter detection module and protective module；The circuit parameter detection module and load connect, and export second circuit parameter value for detecting the first circuit parameter values in load, and according to first circuit parameter values；The protective module is used to that the signal for whether triggering load and stopping working to be issued according to the second circuit parameter value.The present invention passes through the first circuit parameter values in the detection load of circuit parameter detection module; and second circuit parameter value is exported according to the first circuit parameter values; the signal for whether triggering load and stopping working is issued according to second circuit parameter value by protective module again; it realizes when load short circuits; load can quickly be triggered to shut down, the effect in time protecting circuit, circuit structure of the present invention is simple; the device used is few, high reliablity.
Description
Technical field
The present invention relates to electronic circuit technology fields, and in particular to a kind of load short-circuit protection circuit and method and circuit system
System.
Background technique
Currently, for most of frequency conversion drive plates, short circuit overcurrent safeguard measure is mainly in direct current in refrigeration equipment
Busbar grounding side increases sampling resistor R ' to be sampled (such as Fig. 1) to bus current, and compressor operates normally under normal circumstances
Electric current can maintain to stablize in a fixed controlled range, straight-through if there is inverter module upper and lower bridge arm, have high current stream
Over-sampling resistance R ' leads to a big pressure drop, and big pressure drop signal, which is passed to comparator, can generate abnormal output signal, master control
After coremaking piece receives the exception output signal, meeting hard stop is to protect frequency conversion drive plate.
It is short-circuit as a certain relatively generation in the compressor of load but when frequency conversion drive plate drives compressor,
Electric current can pass through three IGBT (Insulated Gate Bipolar Transistor, the insulated gate bipolar of upper bridge arm at this time
Transistor), ground is directly then arrived using compressor stator winding, sampling resistor R, guarantor described above in this way would not be flowed through
Shield measure would not play a protective role, and lead to fried plate.
Summary of the invention
In view of this, it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of load short-circuit protection circuits
With method and circuit system, the protection circuit be can be realized when short circuit occurs for load, and quickly triggering load is shut down, right in time
Circuit board is protected, and protection circuit structure of the present invention is simple, high reliablity.
In order to achieve the above object, the present invention adopts the following technical scheme: a kind of load short-circuit protection circuit, feature exist
In, comprising:
Circuit parameter detection module, the circuit parameter detection module and load connect, for detecting first in load
Circuit parameter values, and second circuit parameter value is exported according to first circuit parameter values；
Protective module, for exporting trigger signal according to the second circuit parameter value, the trigger signal is for triggering
Whether load stops working.
Optionally, the protective module includes:
Voltage comparator；
One input terminal of the voltage comparator and the supply terminals of reference voltage connect, another input terminal and the electricity
The output end of road parameter detection module connects, and the output end of the voltage comparator connects Master control chip.
Optionally, the circuit parameter detection module is current sensor, and first circuit parameter values are current value, institute
Stating second circuit parameter value is voltage value.
Optionally, when load work normally when, the reference voltage is greater than the of circuit parameter detection module output
Two circuit parameter values；
If the Master control chip is determined when the output valve of the voltage comparator is high level maintains loaded work piece,
It is determined when the output valve of the voltage comparator is low level and stops loaded work piece, then the anode input of the voltage comparator
End is connect with the supply terminals of the reference voltage, and negative input is connect with the output end of the circuit parameter detection module.
Optionally, the circuit parameter detection module is voltage sensor, first circuit parameter values and described second
Circuit parameter values are voltage value, and the voltage value of the two is equal in magnitude.
Optionally, when load work normally when, the reference voltage is less than the of circuit parameter detection module output
Two circuit parameter values；
If the Master control chip is determined when the output valve of the voltage comparator is low level maintains loaded work piece,
It is determined when the output valve of the voltage comparator is high level and stops loaded work piece, then the anode input of the voltage comparator
End is connect with the supply terminals of the reference voltage, and negative input is connect with the output end of the circuit parameter detection module.
The present invention also provides a kind of circuit systems, comprising:
Such as the described in any item protection circuits in front；And
Load and the Master control chip with the protection circuit connection；
Wherein, the Master control chip is used to receive the trigger signal that the protection circuit issues, and according to the triggering
Whether the signal control load stops working.
Optionally, the input terminal of each phase of the load is arranged in the circuit parameter detection module.
Optionally, the load includes: compressor.
The present invention also provides a kind of outdoor machine of air-conditioner, including such as the described in any item circuit systems in front.
The present invention also provides a kind of load short circuits guard methods, comprising:
Trigger signal is obtained, the trigger signal is obtained according to the circuit parameter values in load；
Determined whether to stop loaded work piece according to the trigger signal.
Optionally, when the circuit parameter values are current value, and the trigger signal is the output signal of voltage comparator,
The electrode input end of voltage comparator is used for input reference voltage, and negative input is used to input to be obtained according to the current value
It is described to be determined whether to stop loaded work piece according to the trigger signal when voltage value, comprising:
When the trigger signal is high level, determines and maintain loaded work piece；
When the trigger signal is low level, determines and stop loaded work piece.
Optionally, when the circuit parameter values are voltage value, and the trigger signal is the output signal of voltage comparator,
The electrode input end of voltage comparator is used for input reference voltage, when negative input is used to input the voltage value, described
Determine whether to stop working according to the trigger signal, comprising:
When the trigger signal is low level, determines and maintain loaded work piece；
When the trigger signal is high level, determines and stop loaded work piece.
The invention adopts the above technical scheme, by the first circuit parameter values in detection load, and according to the first circuit
Parameter value exports second circuit parameter value, and exports trigger signal according to second circuit parameter value, and trigger signal is for triggering
Whether load stops working, and when short circuit occurs due to load, the first circuit parameter values can symbolize relevant short circuit information, because
This can quickly trigger load and shut down, protect in time to circuit, circuit of the present invention when short circuit occurs for load
Structure is simple, and the device used is few, high reliablity.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of the short circuit overcurrent protection circuit in background technique；
Fig. 2 is the structural schematic diagram of load short-circuit protection circuit embodiment one of the present invention；
Fig. 3 is the structural schematic diagram of load short-circuit protection circuit embodiment two of the present invention in actual use；
Fig. 4 is the structural schematic diagram of load short-circuit protection circuit embodiment three of the present invention in actual use；
Fig. 5 is the structural schematic diagram of circuit system embodiment one provided by the invention；
Fig. 6 is the flow diagram of load short circuits guard method embodiment one of the present invention；
Fig. 7 is the flow diagram of load short circuits guard method embodiment two of the present invention
Fig. 8 is the flow diagram of load short circuits guard method embodiment three of the present invention.
In figure: 1, Master control chip；2, the first current sensor；3, the second current sensor；4, third current sensor；
5, first voltage comparator；6, second voltage comparator；7, tertiary voltage comparator；8, it loads；11, circuit parameter detects mould
Block；12, protective module；13, circuit is protected；14, first voltage sensor；15, second voltage sensor；16, tertiary voltage passes
Sensor.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical solution of the present invention will be carried out below
Detailed description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work
Other embodiment belongs to the range that the present invention is protected.
As shown in Fig. 2, as a kind of optional embodiment of load short-circuit protection circuit of the present invention, what embodiment one provided
Load short-circuit protection circuit, comprising:
Circuit parameter detection module 11, the circuit parameter detection module 11 are connect with load 8, for detecting load 8
The first circuit parameter values, and according to first circuit parameter values export second circuit parameter value；
Protective module 12, an input terminal of the protective module 12 and the output end of the circuit parameter detection module 11
Connection, the protective module 12 are used to that the signal for whether triggering load 8 and stopping working to be issued according to the second circuit parameter value.
Further, the protective module 12 includes:
Voltage comparator；
One input terminal of the voltage comparator and the supply terminals of reference voltage connect, another input terminal and the electricity
The output end of road parameter detection module 11 connects, and the output end of the voltage comparator connects Master control chip 1.
It is understood that by the first circuit parameter values in the circuit parameter detection module 11 detection load 8, and
Export second circuit parameter value according to the first circuit parameter values, then from protective module 12 according to second circuit parameter value to main control
Chip 1 issues whether trigger the signal that load 8 stops working, and when short circuit occurs for load 8, protective module 12 can be issued quickly
The signal that triggering load 8 is shut down, in time protects circuit.
The present invention also provides the embodiments of 8 short-circuit protection circuits 13 of another load, and embodiment two is in embodiment one
On the basis of, further, the circuit parameter detection module 11 is current sensor, and first circuit parameter values are electric current
Value, the second circuit parameter value are voltage value.
It is understood that the current sensor can be voltage-type Hall current sensor.The current sensor and negative
After carrying 8 connections, by the current value (the first circuit parameter values) in acquisition load 8, and according to the current value output voltage values (the
Two circuit parameter values).
Below by the working principle of for example bright 8 short-circuit protection circuit 13 of load, in actual use, the load
The load 8 that 8 short-circuit protection circuits 13 can be used for frequency conversion drive plate is protected, 8 short-circuit protection circuit 13 of the load and frequency conversion drive plate,
The connection relationship of load 8 and Master control chip 1 is as shown in Figure 3.
Wherein, frequency conversion drive plate may include three inverter modules, and each inverter module includes: upper bridge arm and lower bridge
Arm is followed successively by 6 IGBT used for inversion in i.e. Fig. 3 from left to right；
The circuit parameter detection module 11 is current sensor, and the protective module 12 is voltage comparator；Because should
In usage scenario, load 8 input terminal be have three-phase (U phase, V phase and W phase) input, so, loading 8 each phases accordingly
Input terminal is all connected with a current sensor, and the output end of every bit current sensor is separately connected a voltage comparator.I.e.
It in this example embodiment, altogether include: three inverter modules, three current sensors and three voltage comparators, wherein three inversions
Module is respectively as follows: the first inverter module, the second inverter module and third inverter module；Three current sensors are respectively as follows: first
Current sensor 2, the second current sensor 3 and third current sensor 4；Three voltage comparators are respectively as follows: first voltage ratio
Compared with device 5, second voltage comparator 6 and tertiary voltage comparator 7；
Each inverter module draws a phase out-put supply connecting terminal, and the three-phase out-put supply that three inverter modules are drawn connects
Line terminals are U, V and W respectively.
Wherein, out-put supply connecting terminal U and the load 8 of the first inverter module is arranged in first current sensor 2
U phase input terminal between；The negative input of the output end of first current sensor 2 and the first voltage comparator 5
It is connected, the electrode input end of the first voltage comparator 5 is connected with the supply terminals of the reference voltage.The supply terminals is not
It is only limitted to be the power supply with specific output voltage, as long as the equipment for being capable of providing particular voltage level is ok.
Similar, out-put supply connecting terminal V and the load of the second inverter module is arranged in second current sensor 3
Between 8 V phase input terminal；The negative input of the output end of second current sensor 3 and the second voltage comparator 6
It is connected, the electrode input end of the second voltage comparator 6 is connected with the supply terminals of the reference voltage；
The out-put supply connecting terminal W and the W phase of load 8 of third inverter module is arranged in the third current sensor 4
Between input terminal；The output end of the third current sensor 4 is connected with the negative input of the tertiary voltage comparator 7
It connects, the electrode input end of the tertiary voltage comparator 7 is connected with the supply terminals of the reference voltage；
The output end of the first voltage comparator 5, second voltage comparator 6 and tertiary voltage comparator 7 respectively with institute
State the connection of Master control chip 1.
Specific work process: after powering on, if there is a phenomenon where become under shorted to earth, that is, normal operation for load 8
Frequency driving plate can work normally, and the electric current of normal work flows through current sensor, at this time the first current sensor 2, the second electric current
Also for one normally with the voltage value of curent change, this voltage value is less than for the output of sensor 3 and third current sensor 4
Reference voltage (reference voltage is preset, can be 3.3V or 5V), according to the logic judgment of voltage comparator, can export
One high level signal is to Master control chip 1, after Master control chip 1 receives the high level signal, judges that present load 8 is run
Normally, load 8 can be allowed to work on；If 8 shorted to earths of load occur for a certain moment, a very big electricity can be generated immediately
Stream, the electric current can flow through current sensor (in the first current sensor 2, the second current sensor 3 and third current sensor 4
Either one or two of, any two or all), then corresponding current sensor can export one increase with electric current and the voltage value that becomes larger,
The voltage value can be greater than reference voltage, so that corresponding comparator output be made to invert, export low level signal, master control coremaking
After piece 1 receives the low level signal, judges that present load 8 is operating abnormally, load 8 can be allowed to stop working, to realize protection
The effect of circuit 13.
It is understood that the output end of current sensor can also be with the anode of voltage comparator in the present embodiment two
Input terminal is connected, then the negative input of the voltage comparator is connected with the supply terminals of the reference voltage.So, phase
Answer, if load 8 not there is a phenomenon where under shorted to earth, that is, normal operation, according to the logic judgment of voltage comparator, meeting
A low level signal is exported to Master control chip 1, after Master control chip 1 receives the low level signal, judges present load 8
Normal operation can allow load 8 to work on；If 8 shorted to earths of load occur for a certain moment, can generate immediately one very big
Electric current, then corresponding current sensor can export the voltage value for increasing with electric current and becoming larger, which can be greater than reference
Voltage exports high level signal, Master control chip 1 receives the high level so that corresponding comparator output be made to invert
After signal, judge current operation exception, load 8 can be allowed to stop working, to realize the effect of protection circuit 13.
It should be noted that for the requirements of type selecting of current sensor: firstly, maximum range value is being greater than the load 8 just
The current value often to work；Secondly, current sensor will have very high precision and cracking corresponding speed, e.g., the electric current is passed
The precision of sensor is less than 10ppm, and the response time is lower than 0.1us, and the first time that can occur in this way in 8 short circuit of load just takes guarantor
Shield measure.In actual use, the current sensor of the model CQ-131E of Japanese Asahi Chemical Industry's production can be selected.
Further, the load 8 can be compressor.
The present invention also provides the embodiments of the third 8 short-circuit protection circuit 13 of load, and embodiment three is in embodiment one
On the basis of, further, the circuit parameter detection module 11 is voltage sensor, first circuit parameter values and described
Second circuit parameter value is voltage value, and the voltage value of the two is equal in magnitude.
As shown in figure 4, the embodiment three is in actual use, and it is similar with embodiment two, it only will be in embodiment two
The first current sensor 2, the second current sensor 3 and third current sensor 4 replace with first voltage sensor 14, second
Voltage sensor 15 and tertiary voltage sensor 16.
Embodiment three in actual use, when the output end of the first voltage sensor 14 is compared with the first voltage
The negative input of device 5 is connected, the supply terminals phase of the electrode input end and the reference voltage of the first voltage comparator 5
Even；It is described when the output end of the second voltage sensor 15 is connected with the negative input of the second voltage comparator 6
The electrode input end of second voltage comparator 6 is connected with the supply terminals of the reference voltage；When the tertiary voltage sensor 16
Output end be connected with the negative input of the tertiary voltage comparator 7, the tertiary voltage comparator 7 anode input
When end is connected with the supply terminals of the reference voltage, when load 8 works normally, the reference voltage is respectively less than the voltage and passes
The voltage value of sensor output, voltage comparator exports low level at this time；That is, Master control chip 1 connects according to connection relationship as above
After receiving the low level signal, 8 normal operation of present load is judged, load 8 can be allowed to work on；If a certain moment loads
8 shorted to earths, corresponding voltage sensor can export the voltage value for increasing with electric current and becoming smaller, which can be less than ginseng
Voltage is examined, so that corresponding comparator output be made to invert, exports high level signal, Master control chip 1 receives height electricity
After ordinary mail number, judge that present load 8 is operating abnormally, load 8 can be allowed to stop working, to realize the effect of protection circuit 13.
It is understood that the output end of voltage sensor can also be with the anode of voltage comparator in the present embodiment three
Input terminal is connected, then the negative input of the voltage comparator is connected with the supply terminals of the reference voltage.So, phase
Answer, if load 8 not there is a phenomenon where under shorted to earth, that is, normal operation, according to the logic judgment of voltage comparator, meeting
A high level signal is exported to Master control chip 1, after Master control chip 1 receives the high level signal, judges that load 8 is current
Normal operation can allow load 8 to work on；If 8 shorted to earths of load occur for a certain moment, corresponding voltage sensor can be defeated
A voltage value for increasing with electric current and becoming smaller out, which can be less than reference voltage, so that corresponding comparator be made to export
It inverts, exports low level signal, after Master control chip 1 receives the low level signal, it is different to judge that present load 8 is run
Often, load 8 can be allowed to stop working, to realize the effect of protection circuit 13.
Voltage sensor is arranged by the input terminal in load 8 in the present embodiment, and completes in conjunction with voltage comparator to negative
The monitoring for carrying 8 operation conditions can make to load 8 quick shutdowns, protect in time to circuit when short circuit occurs for discovery load 8
The effect of shield.
In addition, as shown in figure 5, the present invention also provides a kind of embodiment of circuit system, the circuit in embodiment one
System includes:
Protection circuit 13 as described in any embodiment of front；And
The load 8 being connect with the protection circuit 13 and the Master control chip 1.
Further, the circuit system further include:
Frequency conversion drive plate；
The frequency conversion drive plate includes: inverter module；
The inverter module includes: upper bridge arm and lower bridge arm；
A phase out-put supply connecting terminal is drawn between the upper bridge arm and lower bridge arm；
One phase out-put supply connecting terminal of the inverter module is connected with the input terminal of the corresponding phase of the load 8；
The input terminal of each phase of the load 8 is arranged in the circuit parameter detection module 11.
The specific structure chart of the circuit system is referring to Fig. 3 and Fig. 4, and this will not be detailed here.
Further, the load 8 includes: compressor.
The present embodiment passes through the setting circuit parameter detection between the out-put supply connecting terminal of frequency conversion drive plate and load 8
Module 11 realizes the monitoring to 8 operation conditions of load, can be to master by protective module 12 when short circuit occurs for discovery load 8
Control chip 1 issues the trigger signal for making to load 8 quick shutdowns, realizes the effect protected in time to circuit.
The present invention also provides a kind of outdoor machine of air-conditioner, which includes circuit system described in any embodiment of front
System.
As shown in fig. 6, the present invention also provides a kind of embodiment of load short circuits guard method, the party in embodiment one
Method includes:
S61: trigger signal is obtained；
The trigger signal includes: the high level or low level signal obtained according to second circuit parameter value, and described second
Circuit parameter values are that circuit parameter detection module is exported according to the first circuit parameter values in detection load；
S62: determined whether to stop loaded work piece according to the trigger signal.
As shown in fig. 7, the implementation two as load short circuits guard method provided by the invention, this method comprises:
S71: trigger signal is obtained；
The trigger signal includes: the high level or low level signal obtained according to second circuit parameter value, and described second
Circuit parameter values are that circuit parameter detection module is exported according to the first circuit parameter values in detection load；
Further, the circuit parameter detection module is current sensor, and the current sensor can be for voltage-type suddenly
That current sensor.
When first circuit parameter values are current value, the second circuit parameter value is voltage value, and the triggering is believed
It number is the output signal of voltage comparator, the supply terminals of the electrode input end connection reference voltage of voltage comparator, cathode input
It is described to determine whether to stop working according to the trigger signal when output end of end connection circuit parameter detection module, comprising:
S72: it when the trigger signal is high level, determines and maintains loaded work piece；
S73: otherwise, it determines stopping loaded work piece.
The working principle of the present embodiment two also passes through Fig. 3 and is illustrated as an example:
After circuit in Fig. 3 powers on, if there is a phenomenon where under shorted to earth, that is, normal operation, frequency conversion is driven for load
Movable plate can work normally, and the electric current of normal work flows through current sensor, at this time the first current sensor, the second current sensor
Also for one normally with the voltage value of curent change, this voltage value is less than reference voltage for output with third current sensor
(reference voltage is preset, can be 3.3V or 5V) can export one high electricity according to the logic judgment of voltage comparator
Ordinary mail number gives Master control chip, after Master control chip receives the high level signal, judges present load normal operation, can allow negative
Load works on；If load shorted to earth occurs for a certain moment, a very big electric current can be generated immediately, which can flow through
Current sensor (any of the first current sensor, the second current sensor and third current sensor, any two or it is complete
Portion), then corresponding current sensor can export the voltage value for increasing with electric current and becoming larger, which can be greater than with reference to electricity
Pressure exports low level signal, Master control chip receives the low level so that corresponding voltage comparator output be made to invert
After signal, judge that present load is operating abnormally, load can be allowed to stop working, to realize the effect of protection circuit.
It is understood that in the above process, as long as there is any one voltage comparator output low level signal that will make to lead
Control chip controls load stops working；Only when all voltage comparators all export high level signal, Master control chip
Present load normal operation is just judged, load can be allowed to work on.
It should be noted that the output end of current sensor can also be with the anode of voltage comparator in the present embodiment two
Input terminal is connected, then the negative input of the voltage comparator is connected with the supply terminals of the reference voltage.So, phase
It answers, if there is a phenomenon where under shorted to earth, that is, normal operation, according to the logic judgment of voltage comparator, meeting is defeated for load
A low level signal is to Master control chip out, after Master control chip receives the low level signal, judges that present load is run
Normally, load can be allowed to work on；If load shorted to earth occurs for a certain moment, a very big electric current can be generated immediately,
Then corresponding current sensor can export the voltage value for increasing with electric current and becoming larger, which can be greater than reference voltage,
To make corresponding comparator output invert, high level signal is exported, after Master control chip receives the high level signal,
Judgement is current to be operating abnormally, and load can be allowed to stop working, to realize the effect of protection circuit.
As shown in figure 8, the implementation three as load short circuits guard method provided by the invention, this method comprises:
S81: trigger signal is obtained；
The trigger signal includes: the high level or low level signal obtained according to second circuit parameter value, and described second
Circuit parameter values are that circuit parameter detection module is exported according to the first circuit parameter values in detection load；
Further, the circuit parameter detection module is voltage sensor, and the voltage sensor is for detecting load
The voltage value of input terminal fixed point.
When first circuit parameter values and the second circuit parameter value are voltage value, and the trigger signal is electricity
Press the output signal of comparator, the supply terminals of the electrode input end connection reference voltage of voltage comparator, negative input connection
It is described to determine whether to stop working according to the trigger signal when output end of circuit parameter detection module, comprising:
S82: it when the trigger signal is low level, determines and maintains loaded work piece；
S83: otherwise, it determines stopping loaded work piece.
The concrete processing procedure of this method refers to the working principle carried out above to Fig. 4 and describes, and this will not be detailed here.
It is understood that same or similar part can mutually refer in the various embodiments described above, in some embodiments
Unspecified content may refer to the same or similar content in other embodiments.
It should be noted that in the description of the present invention, term " first ", " second " etc. are used for description purposes only, without
It can be interpreted as indication or suggestion relative importance.In addition, in the description of the present invention, unless otherwise indicated, the meaning of " multiple "
Refer at least two.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discussed suitable
Sequence, including according to related function by it is basic simultaneously in the way of or in the opposite order, to execute function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
It should be appreciated that each section of the invention can be realized with hardware, software, firmware or their combination.Above-mentioned
In embodiment, software that multiple steps or method can be executed in memory and by suitable instruction execution system with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of column technology or their combination are realized: having a logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are understood that realize all or part of step that above-described embodiment method carries
It suddenly is that relevant hardware can be instructed to complete by program, the program can store in a kind of computer-readable storage medium
In matter, which when being executed, includes the steps that one or a combination set of embodiment of the method.
It, can also be in addition, each functional unit in each embodiment of the present invention can integrate in a processing module
It is that each unit physically exists alone, can also be integrated in two or more units in a module.Above-mentioned integrated mould
Block both can take the form of hardware realization, can also be realized in the form of software function module.The integrated module is such as
Fruit is realized and when sold or used as an independent product in the form of software function module, also can store in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only memory, disk or CD etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (15)
1. a kind of load short-circuit protection circuit characterized by comprising
Circuit parameter detection module is connected with load, for detecting the first circuit parameter values in load, and according to described first
Circuit parameter values export second circuit parameter value；
Protective module, for exporting trigger signal according to the second circuit parameter value, the trigger signal is for triggering load
Whether stop working.
2. circuit according to claim 1, which is characterized in that the protective module includes:
Voltage comparator；
One input terminal of the voltage comparator and the supply terminals of reference voltage connect, another input terminal and the circuit are joined
The output end connection of number detection module, the output end of the voltage comparator connect Master control chip.
3. circuit according to claim 2, which is characterized in that the circuit parameter detection module is current sensor, institute
Stating the first circuit parameter values is current value, and the second circuit parameter value is voltage value.
4. circuit according to claim 3, which is characterized in that when loading normal work, the reference voltage is greater than institute
State the second circuit parameter value of circuit parameter detection module output；
If the Master control chip is determined when the output valve of the voltage comparator is high level maintains loaded work piece, in institute
State voltage comparator output valve be low level when determine stop loaded work piece, then the electrode input end of the voltage comparator with
The supply terminals of the reference voltage connects, and negative input is connect with the output end of the circuit parameter detection module.
5. circuit according to claim 2, which is characterized in that the circuit parameter detection module is voltage sensor, institute
Stating the first circuit parameter values and the second circuit parameter value is voltage value, and the voltage value of the two is equal in magnitude.
6. circuit according to claim 5, which is characterized in that when loading normal work, the reference voltage is less than institute
State the second circuit parameter value of circuit parameter detection module output；
If the Master control chip is determined when the output valve of the voltage comparator is low level maintains loaded work piece, in institute
State voltage comparator output valve be high level when determine stop loaded work piece, then the electrode input end of the voltage comparator with
The supply terminals of the reference voltage connects, and negative input is connect with the output end of the circuit parameter detection module.
7. a kind of circuit system characterized by comprising
Protection circuit as described in claim 1；And
Load and Master control chip with the protection circuit connection,
Wherein, the Master control chip is used to receive the trigger signal that the protection circuit issues, and according to the trigger signal
Control whether the load stops working.
8. system according to claim 7, which is characterized in that
The input terminal of each phase of the load is arranged in the circuit parameter detection module.
9. system according to claim 7 or 8, which is characterized in that the load includes: compressor.
10. a kind of circuit system characterized by comprising
Such as the described in any item protection circuits of claim 2-6；And
Load and the Master control chip with the protection circuit connection.
11. system according to claim 10, which is characterized in that
The input terminal of each phase of the load is arranged in the circuit parameter detection module.
12. a kind of outdoor machine of air-conditioner characterized by comprising claim 7,8 or 11 described in any item circuit systems.
13. a kind of load short circuits guard method characterized by comprising
Trigger signal is obtained, the trigger signal is obtained according to the circuit parameter values in load；
Determined whether to stop loaded work piece according to the trigger signal.
14. according to the method for claim 13, which is characterized in that when the circuit parameter values are current value, and the touching
Signalling is the output signal of voltage comparator, and the electrode input end of voltage comparator is used for input reference voltage, cathode input
It is described to determine whether to stop loading work according to the trigger signal when end is for input the voltage value obtained according to the current value
Make, comprising:
When the trigger signal is high level, determines and maintain loaded work piece；
When the trigger signal is low level, determines and stop loaded work piece.
15. according to the method for claim 13, which is characterized in that when the circuit parameter values are voltage value, and the touching
Signalling is the output signal of voltage comparator, and the electrode input end of voltage comparator is used for input reference voltage, cathode input
It is described to determine whether to stop working according to the trigger signal when end is for inputting the voltage value, comprising:
When the trigger signal is low level, determines and maintain loaded work piece；
When the trigger signal is high level, determines and stop loaded work piece.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810683325.2A CN108988288A (en) | 2018-06-27 | 2018-06-27 | Load short-circuit protection circuit and method and circuit system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810683325.2A CN108988288A (en) | 2018-06-27 | 2018-06-27 | Load short-circuit protection circuit and method and circuit system |
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| Publication Number | Publication Date |
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| CN108988288A true CN108988288A (en) | 2018-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810683325.2A Pending CN108988288A (en) | 2018-06-27 | 2018-06-27 | Load short-circuit protection circuit and method and circuit system |
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