CN208522445U - A kind of current foldback circuit and controller - Google Patents
A kind of current foldback circuit and controller Download PDFInfo
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- CN208522445U CN208522445U CN201821275188.0U CN201821275188U CN208522445U CN 208522445 U CN208522445 U CN 208522445U CN 201821275188 U CN201821275188 U CN 201821275188U CN 208522445 U CN208522445 U CN 208522445U
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Abstract
The utility model provides a kind of current foldback circuit and controller, which includes sampling unit, direction detection amplifier unit, protection signal output unit；Sampling unit samples the electric current of sampling circuit, and exports the sampled signal for characterizing the electric current of the sampling circuit；It includes operational amplifier that direction, which detects amplifier unit; sampled signal is input to the first input end of operational amplifier; second input end grounding of operational amplifier; operational amplifier generates the detection signal of the current direction in characterization sampling circuit according to sampled signal, and exports to protection signal output unit；It protects signal output unit to generate protection signal according to detection signal, and exports to control circuit, control circuit controls the electric current in the sampling circuit according to protection signal.The utility model detects the detection that amplifier unit realizes electric current in sampling circuit by direction, then the overcurrent protection of negative current is realized by protection signal output unit.
Description
Technical field
The utility model relates to circuit protection technical field more particularly to a kind of current foldback circuits and controller.
Background technique
In electronic product, electric current is excessive in order to prevent causes device failure and causes product failure, and overcurrent protection is arranged
Circuit.In some control systems, not only in will appear forward current, there is also reverse current；Therefore, can not only exist just
To overcurrent, can also there be reverse overcurrent.
Utility model content
In view of this, the utility model embodiment provides a kind of current foldback circuit and controller, effectively solve because bearing
The problem of caused fault excessive to electric current.Specific technical solution is as follows:
A kind of current foldback circuit, including sampling unit, direction detection amplifier unit, protection signal output unit；
The sampling unit is at least partially disposed in sampling circuit, samples the electric current of the sampling circuit, and exports characterization
The sampled signal of the electric current of the sampling circuit；
The direction detection amplifier unit includes operational amplifier, and the sampled signal is input to the operational amplifier
First input end, the second input end grounding of the operational amplifier, the operational amplifier are generated according to the sampled signal
The detection signal of the current direction in the sampling circuit is characterized, and is exported to the protection signal output unit；
The protection signal output unit generates protection signal according to the detection signal, and exports to the control electricity
Road, the control circuit control the electric current in the sampling circuit according to the protection signal.
The utility model embodiment additionally provides a kind of controller, for controlling compressor, including driving circuit and MCU control
Circuit processed, above-mentioned current foldback circuit, the current foldback circuit output protection signal to the driving circuit or MCU control
Circuit processed.
A kind of current foldback circuit provided by the embodiment of the utility model detects amplifier unit by direction and detects to sample
Sense of current in circuit, the current direction is different, and the detection signal magnitude range that direction detects the output of amplifier unit is different, then
By protection signal output unit according to the detection signal output protection signal to control circuit, control circuit is according to the guarantor
Signal is protected, protection act is executed, prevents whole system from overcurrent fault occurs.
A kind of controller plc provided by the embodiment of the utility model realizes negative sense electricity by above-mentioned current foldback circuit
The protection for flowing through stream, effectively increases circuit stability, guarantees the operational safety of compressor.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to disclosed attached drawing.
Fig. 1 is the current foldback circuit structural block diagram that an embodiment of the present invention provides；
Fig. 2 is the current foldback circuit structure chart that another embodiment of the utility model provides；
Fig. 3 is the controller architecture block diagram that another embodiment of the utility model provides；
Fig. 4 is the controller circuit structure figure that another embodiment of the utility model provides.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
In circuit, overcurrent protection is a kind of common function, and when electric current only has a kind of direction, (we claim the electric current
Flow direction is forward direction), it is only necessary to forward current current foldback circuit, which is arranged, can be realized overcurrent protection.But in many circuit loops
In, for example the main control loop of compressor, current direction be simultaneously not fixed, that is to say, that existing forward current, and have negative current
(electric current contrary with forward current) is therefore only arranged forward current current foldback circuit and is not enough to realize negative sense overcurrent
Protection.Based on this, the utility model embodiment provides a kind of current foldback circuit, and the overcurrent that can be realized negative current is protected
Shield.
A kind of current foldback circuit disclosed in the utility model embodiment is connected with control circuit, control circuit control sampling
Size of current in circuit, sampling circuit are by the circuit of overcurrent protection, and current foldback circuit 1 is according to electric current in sampling circuit
Size output protection signal Vp, until control circuit, after control circuit receives protection signal Vp, executes in control sampling circuit
Electric current reduces or stops a series of one of overcurrent protection movements such as itself work or various motion, to play circuit protection
Function.Specifically, as shown in Figure 1, the current foldback circuit includes sampling unit 11, direction detection amplifier unit 12, protection letter
Number output unit 13；
The sampling unit 11 is at least partially disposed in sampling circuit, for sampling the electric current of the sampling circuit, and it is defeated
The sampled signal Vs of the electric current of the sampling circuit is characterized out；Size of current in the sampling circuit is controlled by control circuit；
The direction detection amplifier unit 12 includes operational amplifier, and the sampled signal Vs is input to the operation amplifier
The first input end of device, the second input end grounding of the operational amplifier, the operational amplifier is according to the sampled signal
Vs generates the detection signal Vj for characterizing the current direction in the sampling circuit, and exports to the protection signal output unit
13；Current direction in the sampling circuit is different, and the detection signal Vj magnitude range is different；It should be noted that described
Second input end grounding of operational amplifier, which does not represent, to be coupled directly to ground, and can also be connected by resistance or other electronic devices
It is connected to ground.
The protection signal output unit 13 generates protection signal Vp according to the detection signal Vj, and exports to described
Control circuit, the control circuit control the electric current in the sampling circuit according to the protection signal Vp.
In the present embodiment, when the current direction difference in sampling circuit, the sampled signal of the output of sampling unit 11
Vs is of different sizes, and sampled signal Vs is of different sizes, and the size for detecting signal Vj is also different, and the direction sampled signal Vs is different
When, detection signal Vj magnitude range is different, for example, realizing that working as electric current in sampling circuit is forward direction, then examines by operational amplifier
Survey signal Vj size be (V1, V2]；When in sampling circuit electric current be negative sense when, detection signal Vj size be [0, V1)；Work as sampling
When size of current is 0 in circuit, detection signal Vj size is V1.Detection signal Vj is input to protection signal output unit 13, root
Generating protection signal Vp according to Vj can be for when Vj is more than or less than a certain a reference value, output protection signal Vp, Vp be can be
High level signal, the signal of normal work and overcurrent work can be distinguished by being also possible to low level signal or other, this is practical
It is novel not limit this.Control circuit can be central processing control circuit or switching circuit, such as MCU control circuit,
Cpu control circuit, buck circuit (buck circuit), boost circuit (boost circuit) or flyback circuit (flyback electricity
Road) etc..Control circuit receives to execute protection act after protection signal Vp, and protection act, which can be, reduces sampling circuit electricity
Stream, is also possible to the control chip in closing control circuit, so that circuit is in intermittent work state or directly stop circuit
Only work etc..
In another specific embodiment, as shown in Fig. 2, sampling unit 11 includes sampling resistor Rs, biasing resistor Rc, divides
Piezoresistance Rf and bias voltage Vcc, the sampling resistor Rs is connected in the sampling circuit, for detecting in sampling circuit
Electric current Is in sampling circuit, not only will appear forward current Is1, but also will appear negative current Is2.The biasing resistor Rc and institute
It states divider resistance Rf to divide the voltage on the bias voltage and the sampling resistor, and regard partial pressure result as sampling
Signal Vs is input to the direction detection amplifier unit 12.In the present embodiment, analyzes for convenience, enable the one end sample circuit Rs
Ground connection, sampling resistor the Rs other end voltage Vs1=Is*Rs, sampled signal Vs=Vs1+ (Vcc-Vs1)/(Rc+Rf) * Rf, by this
Formula is it is found that Vs and Is direct proportionality, Is increase, and Vs increases, and wherein Is has direction.Therefore, the present embodiment is single by sampling
The electric current Is of the 11 sampling sampling circuit of member, and obtain characterizing the sampled signal Vs of the electric current Is of the sampling circuit, it inputs
Amplifier unit 12 is detected to direction.Certain sampling unit 11 also may include current transformer (CT), the side of current transformer
Windings in series is in sampling circuit.Therefore, sampling unit is at least partially disposed in sampling circuit.
Further, in the above-described embodiments, as shown in Fig. 2, in the operational amplifier U1 of direction detection amplifier unit 12,
The first input end is the positive input of the operational amplifier, and sampled signal Vs is input to the forward direction of operational amplifier U1
Input terminal, second input terminal are the reverse input end of the operational amplifier；The reverse input end passes through first resistor
R1 is grounded, and the output end of the operational amplifier is connected to by second resistance R2.In the present embodiment, operational amplifier U1's
Output end output detection signal Vj be analog quantity, and with sampled signal Vs also direct proportionality.Therefore, Vj is also that characterization is adopted
Another signal of sample loop current Is.It should be noted that in the present embodiment, the opamp-output signal of setting and input
The relationship of signal is in direct ratio, when sampled signal direction or it is of different sizes when, detection signal Vj it is also different, therefore detect signal Vj
The size of current in sampling circuit or direction can be characterized.
Further, in the above-described embodiments, as shown in Fig. 2, protection signal output unit 13 compares including negative current
Device U2, the negative current comparator compare the output end that end connects the operational amplifier, the negative current comparator base
Quasi- end connects reversed reference signal, when the negative current is greater than negative current threshold value, the reversed comparator output protection
Signal, the negative current threshold value are corresponding with the reversed reference signal.Let it be assumed, for the purpose of illustration, that negative current threshold value is
I2-, when the absolute value of negative current Is2 is greater than the absolute value of I2-, triggering reverse overcurrent protection.Specifically, working as | Is2 | > |
I2- | when, it is contemplated that the direction Is2 is negative, then Is2 < I2-, then (Vs2 corresponds to Is2 to Vs < Vs2, by bias voltage, biased electrical
Resistance, sampling resistor and divider resistance determine), then (Vj2 corresponds to Is2 to Vj < Vj2, is determined by the amplification factor of operational amplifier U1
It is fixed), at this point, it is Vj2 that reversed reference signal Vref2, which is arranged, in the present embodiment, reversed reference signal connect reversed comparator U2 just
To input terminal, therefore, as Vj < Vref2, reversed comparator output is the protection signal of high level, which is input to control
Circuit processed after control circuit receives the protection signal of high level, executes protection act.
Further, in order to while realizing that reverse overcurrent is protected, realize positive overcurrent protection, in the present embodiment
In, the protection signal output unit further includes forward current comparator, when forward current Is1 is greater than forward current threshold value,
Forward current comparator output protection signal.Specifically, the comparison end of forward current comparator can be directly connected to sampling letter
Number output end, the sampled signal Vs for receiving characterization electric current Is can be the ungrounded end of sampling resistor Rs in Fig. 2, can also be with
It is the common end of divider resistance Rf and Rc, equally, the comparison end of forward current comparator also may be coupled to direction detection amplifier
The output end of unit receives detection signal Vj, and forward current comparator reference end connects forward reference signal, adopts when described
When forward current is greater than forward current threshold value in sample circuit, the forward direction comparator output protection signal, the forward current threshold
Value is corresponding with the forward reference signal, i.e., forward reference signal is determined by forward current threshold value.Referring to saying for reversed comparator
It is bright, it is assumed that control circuit executes protection act after receiving high level, then setting, which is compared, holds as positive current comparator just
Input terminal, reference edge are that its reverse input end is input to the sampled signal that positive comparator compares end when forward current overcurrent
Greater than the forward reference signal of reference edge, then forward current comparator exports high level, which is input to control circuit,
After control circuit receives the protection signal after high level, protection act is executed.It should be noted that positive, direction input terminal
Setting only need with control circuit execute protection act logic meet, if control circuit is set as low level and executes guarantor
Shield acts, then the positive input and reverse input end of operational amplifier U1, reverse current comparator and forward current comparator
Corresponding change is made, the utility model is not specifically limited in this embodiment.
For the control system of motor, such as compressor, it will appear negative current in the process of running, therefore, only
Forward current current foldback circuit be it is inadequate, it is safe and reliable in order to guarantee, it is necessary to which that negative current overcurrent protection electricity is set
Road.Especially for air-heater convertible frequency air-conditioner, for the heating efficiency and inexpensive requirement for reaching extremely low temperature, selection exists
Additional air injection enthalpy-increasing function becomes the solution that many air-heater convertible frequency air-conditioners producer takes on the basis of domestic variable frequency air-conditioning, but
The refrigerant of vapour-liquid mixed state can cause mechanical shock to compressor rotor when air injection enthalpy-increasing, especially in liquid refrigerants ingredient
Impact is bigger when more, step-out, de- the problem of adjusting can be caused to the driving of compressor, compressor is in motor/power generation at this time
It is more frequent and serious to generate the phenomenon that positive/negative electric current is alternately produced for the alternate state of machine.
Based on above-mentioned current foldback circuit, the utility model embodiment additionally provides a kind of controller, for controlling pressure
Contracting machine, as shown in figure 3, including driving circuit 2, MCU control circuit 3 and above-mentioned current foldback circuit 1, the overcurrent protection electricity
Road output protection signal is to the driving circuit or MCU control circuit, to realize overcurrent protection.Wherein, driving circuit 2 can
Think the driving circuit for being used to drive compressor of discrete device composition, or IPM (intelligent power module) driving circuit.
Further, controller provided by the embodiment of the utility model, the electricity of the sampling circuit of the current foldback circuit
Stream is the sum of described compressor three-phase current, and the sampling unit of the current foldback circuit is placed in the compressor current total loop
In, i.e., U/V/W three-phase current flows through the sampling unit after converging.Specifically, sampling unit includes that a single sampling resistor is (or more
A resistance is series-parallel), wherein the connection relationship of single sampling resistor Rs is as shown in figure 4, sampling unit 11 passes through single sampling resistor Rs
It detects to flow through the electric current of compressor and exports the sampled signal Vs for characterizing the electric current, sampled signal Vs is input to direction detection
The input terminal of amplifier unit 12, when the current direction that flows through compressor and it is of different sizes when, the range for detecting signal Vj is also different.
Specifically, direction detection amplifier unit is as shown in figure 4, include operational amplifier U1, by parameter to operational amplifier U1 and
The setting of feedback network, so that direction detects the output A/D voltage signal in amplifier circuit 12 when the electric current of compressor is 0A
(detection signal Vj) is V1；When the electric current of compressor is positive (as shown in Is1), direction detects the output A/ in amplifier circuit 12
D voltage signal (detection signal Vj) changes between V1~V2；When the electric current of compressor is negative sense (as shown in Is2), direction inspection
The output A/D voltage signal (detection signal Vj) in amplifier circuit 12 changes between 0V~V1 out；It therefore, can be by detecting signal
The range of Vj judges the current direction of compressor.Again by protecting signal output unit 13 to judge Vj, decide whether
Need output protection signal Vp.Specifically, in the present embodiment, protection signal output unit 13 includes comparator U2, if stream
The electric current of overcompression machine is excessive (overcurrent), and when protection threshold voltage more than comparator U2, comparator output signal reversion, this is anti-
Turn the Cin/Ocp overcurrent protection port that level signal enters in IPM driving circuit, after triggering IPM protection, IPM internal hardware is returned
Road can cut off six road IGBT driving signal certain time interval Ts while drag down Fo (fault output) output, this Fo signal feedback
MCU control circuit is returned, then respond, stop the PWM drive signal of six road IGBT within certain time interval T by MCU calculation process
Output, to play the role of overcurrent protection, avoid compressor damage.
On that basi of the above embodiments, the protection signal output unit output protection signal of the current foldback circuit is to institute
The overcurrent protection port for stating IPM driving circuit, the PWM drive signal that six phases for cutting off the IPM driving circuit input.Into
One step, the direction detection amplifier unit of the current foldback circuit and/or the output end of protection signal output unit are also connected with
To the MCU control circuit, for cutting off the PWM drive signal of the IPM driving circuit or six phase input.This implementation
In example, overcurrent protection is realized except through IPM driving circuit, overcurrent protection is also realized by MCU control unit, is protected when receiving
After protecting signal, MCU control circuit stops the output of the PWM drive signal of six road IGBT, to play the second protective effect again.
In order to realize multiple protective, over-current protecting unit is set in the MCU control circuit, the over-current protecting unit connects
Detection signal is received, when overcurrent occurs, different protection acts is executed according to the detection signal magnitude, for example the overcurrent is protected
It protects unit and different protected modes is selected according to the protection signal of input or detection signal magnitude, such as when serious overcurrent, overcurrent
Protection location directly closes the driving of IGBT, and entire control system is out of service；When overcurrent is more serious, intermittence is closed
The driving of IGBT, to take into account the normal work of overcurrent protection and entire controller.
In above controller embodiment, the detection signal of direction detection amplifier unit output is analog signal and can characterize
The compressor current, compressor current are related with compressor drum position.Therefore, detection amplifier unit in direction, which is also able to achieve, turns
Sub- position detecting function.Based on this, the utility model additionally provides another embodiment, the direction inspection of the current foldback circuit
Amplifier unit output end is connected to the MCU control circuit out, and the MCU control circuit receives the direction and detects amplifier unit
The detection signal of output, and according to the position detected signal magnitude and judge compressor drum, turn further according to the compressor
The position of son carries out six phase drive control of IPM.The present embodiment is not only able to achieve overcurrent protection, moreover it is possible to be carried out according to rotor-position
Six phase drive control of IPM.Specifically, detection signal is output to MCU control circuit, MCU control circuit to the detection signal into
Row vector calculus, changes the pulsewidth or frequency of PWM drive signal according to operation result, to realize the accurate of six phase of IPM driving
Control；Wherein, vector operation approach includes current error method or expansion electrification platen press etc. thoroughly.
Controller provided by the embodiment of the utility model has the advantage that
1) the compressor negative current overcurrent protection hardware-in-the-loop for devising quick response, when negative sense overcurrent generates,
Sampling unit 11, direction detection amplifier unit 12, the protection signal output comprising negative current comparator U2 can be passed through in time
Unit 13, IPM driving circuit 2, MCU control circuit 3, cut off IPM internal hardware and be cut off by MCU process control
The PWM drive signal of six phases input pacifies power device IPM and compressor by the quick response in hardware protection circuit in time
Stopping acts entirely.
2) MCU chip that overcurrent protection signal is fed back to software MCU control circuit is devised, makes MCU chip by setting
Protection system drive content, carry out normal action protection stopping processing.
It should be understood that embodiment of above is merely to illustrate the utility model and not limits the utility model and retouched
The technical solution stated, although this specification has been carried out detailed description to the utility model referring to above-mentioned embodiment,
Be, those skilled in the art should understand that, person of ordinary skill in the field still can to the utility model into
Row modification or equivalent replacement, and the technical solution and its improvement of all spirit and scope for not departing from the utility model, should all
Cover in the scope of the claims of the utility model.
Claims (10)
1. a kind of current foldback circuit, which is characterized in that including sampling unit, direction detection amplifier unit, protection signal output
Unit；
The sampling unit is at least partially disposed in sampling circuit, samples the electric current of the sampling circuit, and is exported described in characterization
The sampled signal of the electric current of sampling circuit；
The direction detection amplifier unit includes operational amplifier, and the sampled signal is input to the first of the operational amplifier
Input terminal, the second input end grounding of the operational amplifier, the operational amplifier are generated according to the sampled signal and are characterized
The detection signal of current direction in the sampling circuit, and export to the protection signal output unit；
The protection signal output unit generates protection signal according to the detection signal, and exports to control circuit, the control
Circuit processed controls the electric current in the sampling circuit according to the protection signal.
2. current foldback circuit according to claim 1, which is characterized in that the sampling unit include sampling resistor, partially
Resistance, divider resistance and bias voltage are set, the sampling resistor is connected in the sampling circuit, the biasing resistor and described
Divider resistance divides the voltage on the bias voltage and the sampling resistor, and partial pressure result is believed as sampling
Number, it is input to the direction detection amplifier unit.
3. current foldback circuit according to claim 1, which is characterized in that the first input end is the operation amplifier
The positive input of device, second input terminal are the reverse input end of the operational amplifier；The reverse input end passes through
First resistor is grounded, and the output end of the operational amplifier is connected to by second resistance.
4. current foldback circuit according to claim 1-3, which is characterized in that the protection signal output unit
Including negative current comparator, the negative current comparator compares the output end that end connects the operational amplifier, described negative
Reversed reference signal is connected to current comparator reference edge, it is described reversed when the negative current is greater than negative current threshold value
Comparator output protection signal, the negative current threshold value are corresponding with the reversed reference signal.
5. current foldback circuit according to claim 4, which is characterized in that the protection signal output unit further includes just
To current comparator, the forward current comparator compares end and receives the sampled signal or the detection signal, it is described just
Forward reference signal is connected to current comparator reference edge, when forward current is greater than forward current threshold value in the sampling circuit
When, the forward direction comparator output protection signal, the forward current threshold value is corresponding with the forward reference signal.
6. a kind of controller, for controlling compressor, including driving circuit and MCU control circuit, which is characterized in that further include as
The described in any item current foldback circuits of claim 1-5, the current foldback circuit output protection signal to the driving electricity
Road or MCU control circuit.
7. controller according to claim 6, which is characterized in that the electric current of the sampling circuit of the current foldback circuit is
The sum of described compressor three-phase current, the sampling unit of the current foldback circuit are placed in the compressor current total loop.
8. controller according to claim 7, which is characterized in that the driving circuit is IPM driving circuit, the overcurrent
Protect the protection signal output unit output protection signal of circuit to the overcurrent protection port of the IPM driving circuit.
9. controller according to claim 8, which is characterized in that the MCU control circuit includes that overcurrent protection selection is single
Member, the overcurrent protection selecting unit are connected to the direction detection amplifier unit and receive the detection signal, when overcurrent, institute
It states overcurrent protection selecting unit and different protected modes is selected according to the detection signal magnitude.
10. according to the described in any item controllers of claim 6-9, which is characterized in that examine in the direction of the current foldback circuit
Amplifier unit output end is connected to the MCU control circuit out, and the MCU control circuit receives the direction and detects amplifier unit
The detection signal of output, and according to the position detected signal magnitude and judge compressor drum, turn further according to the compressor
The position of son carries out six phase drive control of IPM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821275188.0U CN208522445U (en) | 2018-08-08 | 2018-08-08 | A kind of current foldback circuit and controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821275188.0U CN208522445U (en) | 2018-08-08 | 2018-08-08 | A kind of current foldback circuit and controller |
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| CN208522445U true CN208522445U (en) | 2019-02-19 |
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| CN201821275188.0U Active CN208522445U (en) | 2018-08-08 | 2018-08-08 | A kind of current foldback circuit and controller |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038476A (en) * | 2018-08-08 | 2018-12-18 | 杭州先途电子有限公司 | A kind of current foldback circuit and controller |
| CN110412341A (en) * | 2019-08-09 | 2019-11-05 | 珠海格力电器股份有限公司 | IPM over-current detection circuit |
-
2018
- 2018-08-08 CN CN201821275188.0U patent/CN208522445U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038476A (en) * | 2018-08-08 | 2018-12-18 | 杭州先途电子有限公司 | A kind of current foldback circuit and controller |
| CN110412341A (en) * | 2019-08-09 | 2019-11-05 | 珠海格力电器股份有限公司 | IPM over-current detection circuit |
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