CN209805408U - Overcurrent protection device, power factor correction circuit and air conditioner - Google Patents
Overcurrent protection device, power factor correction circuit and air conditioner Download PDFInfo
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- CN209805408U CN209805408U CN201920858913.5U CN201920858913U CN209805408U CN 209805408 U CN209805408 U CN 209805408U CN 201920858913 U CN201920858913 U CN 201920858913U CN 209805408 U CN209805408 U CN 209805408U
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- 238000005070 sampling Methods 0.000 claims abstract description 49
- 238000000034 method Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 12
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- 239000003990 capacitor Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The disclosure provides an overcurrent protection device, a power factor correction circuit and an air conditioner. The overcurrent protection device includes: a control signal generator configured to provide a control signal; the sampling circuit is arranged on a bus of the PFC circuit and is configured to provide a sampling voltage; a protection circuit configured to stop sending the control signal to the PFC circuit to interrupt operation of the PFC circuit if the sampled voltage is greater than the voltage of the control signal. According to the method and the device, complex calculation processing is not needed, and the response can be timely made under the condition that the PFC bus is over-current, so that the PFC circuit can be effectively protected.
Description
Technical Field
The disclosure relates to the field of control, in particular to an overcurrent protection device, a power factor correction circuit and an air conditioner.
Background
In the inverter air conditioner, in order to reduce current harmonics and improve a Power Factor, a PFC (Power Factor Correction) circuit is generally used on an electric control board of the inverter air conditioner.
In order to avoid an overcurrent condition in the PFC circuit, in the related art, a signal processor detects a current on a PFC bus. The signal processor provides a control signal to the PFC circuit in the event that the PFC bus current does not exceed a predetermined threshold. In the event that the PFC bus current exceeds a predetermined threshold, the signal processor stops providing the control signal to the PFC circuit.
SUMMERY OF THE UTILITY MODEL
The inventor has noticed that, in the related art, since the signal processor needs to detect the PFC bus current through software, time consumption is long, and it is impossible to respond in time when the PFC bus is in an overcurrent state, so that the PFC circuit cannot be effectively protected.
therefore, the scheme capable of rapidly protecting the PFC circuit is provided.
According to a first aspect of the embodiments of the present disclosure, there is provided an overcurrent protection apparatus, including: a control signal generator configured to provide a control signal; the sampling circuit is arranged on a bus of the PFC circuit and is configured to provide a sampling voltage; a protection circuit configured to stop transmitting the control signal to the PFC circuit to interrupt operation of the PFC circuit if the sampled voltage is greater than a voltage of the control signal.
In some embodiments, the protection circuit is further configured to send the control signal to the PFC circuit if the sampled voltage is not greater than the voltage of the control signal.
In some embodiments, the sampling circuit includes a sampling resistor, wherein a first end of the sampling resistor is electrically connected to a ground terminal of the PFC circuit, a second end of the sampling resistor is electrically connected to a negative input terminal of a rectifying circuit in the PFC circuit, and the sampling voltage is a voltage at the first end of the sampling resistor.
in some embodiments, the protection circuit includes: and the non-inverting input end of the voltage comparator is electrically connected with the output end of the control signal generator, the inverting input end of the voltage comparator is electrically connected with the first end of the sampling resistor, and the output end of the voltage comparator is electrically connected with the PFC circuit.
In some embodiments, the over-current protection device further comprises: a driving circuit configured to amplify the control signal output by the voltage comparator and transmit the amplified control signal to the PFC circuit.
in some embodiments, the input terminal of the driving circuit is electrically connected to the output terminal of the voltage comparator, and the output terminal of the driving circuit is electrically connected to the switching device of the PFC circuit.
In some embodiments, the control signal is a pulse width modulated PWM signal.
According to a second aspect of the embodiments of the present disclosure, there is provided a power factor correction circuit including the over-current protection device according to any one of the embodiments.
According to a third aspect of the embodiments of the present disclosure, there is provided an air conditioner including the power factor correction circuit according to any one of the embodiments.
other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
in order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is an exemplary block diagram of an over-current protection circuit of one embodiment of the present disclosure;
FIG. 2 is an exemplary block diagram of a sampling circuit of one embodiment of the present disclosure;
FIG. 3 is an exemplary block diagram of a protection circuit of one embodiment of the present disclosure;
FIG. 4 is an exemplary block diagram of an over-current protection circuit of another embodiment of the present disclosure;
Fig. 5 is an exemplary block diagram of a PFC circuit according to one embodiment of the present disclosure;
Fig. 6 is an exemplary block diagram of an air conditioner according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is an exemplary block diagram of an overcurrent protection circuit according to an embodiment of the present disclosure. As shown in fig. 1, the overcurrent protection circuit includes a control signal generator 1, a sampling circuit 2, and a protection circuit 3.
The control signal generator 1 is configured to provide a control signal.
In some embodiments, the control signal provided by the control signal generator 1 is a PWM (Pulse Width Modulation) signal.
The sampling circuit 2 is provided on a bus of the PFC circuit. The sampling circuit 2 is configured to provide a sampling voltage.
Fig. 2 is an exemplary block diagram of a sampling circuit according to one embodiment of the present disclosure.
As shown in fig. 2, a rectifier circuit 41, an inductor 42, and a switching device 43 are included in the PFC circuit. In some embodiments, the switching device 43 is an IGBT (Insulated Gate Bipolar Transistor). And a sampling circuit 2 is arranged on the PFC bus. In some embodiments, the sampling circuit 2 comprises a sampling resistor 21. A first end of the sampling resistor 21 is electrically connected to a ground terminal of the PFC circuit, and a second end of the sampling resistor 21 is electrically connected to a negative input terminal of the rectifier circuit 41.
when the switching device 43 is turned on, a current flowing in a clockwise direction is formed among the rectifying circuit 41, the inductor 42, the switching device 43, and the sampling resistor 21. The current passes through the sampling resistor 21, and a voltage is developed across the sampling resistor 21. Obviously, the larger the current on the PFC bus, the larger the voltage formed across the resistor 21, and therefore, the present disclosure detects whether the PFC bus has an overcurrent by sampling the voltage. Here, the voltage at the first terminal of the sampling resistor 21 is taken as the sampling voltage Vs.
in the embodiment shown in fig. 1, the protection circuit 3 is configured to stop sending the control signal to the PFC circuit to interrupt the operation of the PFC circuit in the case where the sampled voltage is greater than the voltage of the control signal.
In some embodiments, the protection circuit 3 is further configured to send the control signal provided by the control signal generator 1 to the PFC circuit in case the sampled voltage is not greater than the voltage of the control signal.
Fig. 3 is an exemplary block diagram of a protection circuit of one embodiment of the present disclosure.
As shown in fig. 3, the protection circuit 3 includes a voltage comparator 31. The non-inverting input terminal 311 of the voltage comparator 31 is electrically connected to the output terminal of the control signal generator 1, the inverting input terminal 312 of the voltage comparator 31 is electrically connected to the first terminal of the sampling resistor 21, and the output terminal 313 of the voltage comparator 31 is electrically connected to the PFC circuit.
In some embodiments, if the sampled voltage Vs is not greater than the control signal, it indicates that no overcurrent occurs on the PFC bus at this time, in which case the voltage comparator 31 normally outputs the control signal. If the sampling voltage Vs is greater than the control signal, it indicates that the PFC bus is in an overcurrent state, and in this case, the voltage comparator 31 stops outputting the control signal, so that the switching device 43 in the PFC circuit is in an off state, and thus, the impact of a large current on the inductor 42 and the switching device 43 is effectively avoided.
In the overcurrent protection device provided by the above embodiment of the present disclosure, the sampling voltage and the voltage of the control signal are directly compared, and the PFC circuit is directly controlled according to the voltage comparison result. According to the method and the device, the sampling information does not need to be processed through software, so that the response can be timely made under the condition that the PFC bus is over-current, and the PFC circuit can be effectively protected.
Fig. 4 is an exemplary block diagram of an over-current protection circuit according to another embodiment of the present disclosure. In the embodiment shown in fig. 4, the overcurrent protection circuit further includes a driving circuit 5.
The driving circuit 5 is configured to amplify the control signal output from the voltage comparator 31 and send the amplified control signal to the PFC circuit.
In some embodiments, the input terminal 51 of the driving circuit 5 is electrically connected to the output terminal 313 of the voltage comparator 31, and the output terminal 52 of the driving circuit 5 is electrically connected to the switching device 43 in the PFC circuit. The switching device 43 is driven efficiently by a control signal via the drive circuit 5.
Fig. 5 is an exemplary block diagram of a PFC circuit according to one embodiment of the present disclosure. As shown in fig. 5, the PFC circuit includes the overcurrent protection circuit according to any one of the embodiments of fig. 1 to 4.
As shown in fig. 5, the control signal generator 1 provides a control signal. The voltage comparator 31 compares the control signal voltage with the sampling voltage supplied by the sampling resistor 21. If the sampling voltage is not greater than the control signal, it indicates that no overcurrent occurs in the PFC bus at this time, and in this case, the voltage comparator 31 normally outputs the control signal. The driving circuit 5 amplifies the control signal and provides the amplified control signal to the switching device 43, so as to control the PFC circuit accordingly. If the sampling voltage is greater than the control signal, it indicates that the PFC bus is overcurrent, and in this case, the voltage comparator 31 stops outputting the control signal, so that the switching device 43 is in a cut-off state, thereby effectively avoiding the impact of a large current on the inductor 42 and the switching device 43.
It should be noted that, in the embodiment shown in fig. 5, the diode D1, the resistors R1-R4, and the capacitors C1-C4 are used to optimize the circuit to ensure stable operation of the circuit, and the corresponding parameters can be adjusted according to actual needs.
Fig. 6 is an exemplary block diagram of an air conditioner according to an embodiment of the present disclosure.
As shown in fig. 6, the air conditioner 61 includes a power factor correction circuit 62 therein. The power factor correction circuit 62 is the power factor correction circuit according to any of the embodiments shown in fig. 5.
the present disclosure directly compares the voltage of the control signal with the sampling voltage, and directly controls the PFC circuit according to the voltage comparison result. According to the method and the device, the sampling information does not need to be processed through software, so that the response can be timely made under the condition that the PFC bus is over-current, and the PFC circuit can be effectively protected. In addition, even if the sampling voltage is wrong at a certain moment, the switching device in the PFC circuit is turned off, but the switching device in the PFC circuit can be turned on again at the next moment according to the correct sampling voltage, so that the error protection action is effectively eliminated.
the description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (9)
1. an overcurrent protection device, comprising:
A control signal generator configured to provide a control signal;
The sampling circuit is arranged on a bus of the power factor correction PFC circuit and is configured to provide a sampling voltage;
a protection circuit configured to stop transmitting the control signal to the PFC circuit to interrupt operation of the PFC circuit if the sampled voltage is greater than a voltage of the control signal.
2. The overcurrent protection device of claim 1, wherein:
The protection circuit is further configured to send the control signal to the PFC circuit if the sampled voltage is not greater than the voltage of the control signal.
3. The over-current protection device according to claim 1,
The sampling circuit comprises a sampling resistor, wherein the first end of the sampling resistor is electrically connected with the grounding end of the PFC circuit, the second end of the sampling resistor is electrically connected with the negative access end of a rectifying circuit in the PFC circuit, and the sampling voltage is the voltage at the first end of the sampling resistor.
4. The over-current protection device according to claim 3, wherein the protection circuit comprises:
And the non-inverting input end of the voltage comparator is electrically connected with the output end of the control signal generator, the inverting input end of the voltage comparator is electrically connected with the first end of the sampling resistor, and the output end of the voltage comparator is electrically connected with the PFC circuit.
5. The over-current protection device according to claim 4, further comprising:
a driving circuit configured to amplify the control signal output by the voltage comparator and transmit the amplified control signal to the PFC circuit.
6. The overcurrent protection device of claim 5, wherein:
The input end of the driving circuit is electrically connected with the output end of the voltage comparator, and the output end of the driving circuit is electrically connected with the switching device of the PFC circuit.
7. The over-current protection device according to any one of claims 1-6, wherein the control signal is a Pulse Width Modulation (PWM) signal.
8. A power factor correction circuit comprising an overcurrent protection arrangement as claimed in any one of claims 1 to 7.
9. an air conditioner characterized by comprising the power factor correction circuit according to claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920858913.5U CN209805408U (en) | 2019-06-10 | 2019-06-10 | Overcurrent protection device, power factor correction circuit and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920858913.5U CN209805408U (en) | 2019-06-10 | 2019-06-10 | Overcurrent protection device, power factor correction circuit and air conditioner |
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| CN209805408U true CN209805408U (en) | 2019-12-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110071484A (en) * | 2019-06-10 | 2019-07-30 | 珠海格力电器股份有限公司 | Overcurrent protection device, power factor correction circuit, air conditioner and overcurrent protection method |
| CN110989749A (en) * | 2019-12-24 | 2020-04-10 | 联合汽车电子有限公司 | Silicon controlled rectifier control circuit, system and method |
| CN113357805A (en) * | 2021-05-31 | 2021-09-07 | 青岛海尔空调器有限总公司 | Control method and control device for compressor and air conditioner |
-
2019
- 2019-06-10 CN CN201920858913.5U patent/CN209805408U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110071484A (en) * | 2019-06-10 | 2019-07-30 | 珠海格力电器股份有限公司 | Overcurrent protection device, power factor correction circuit, air conditioner and overcurrent protection method |
| CN110989749A (en) * | 2019-12-24 | 2020-04-10 | 联合汽车电子有限公司 | Silicon controlled rectifier control circuit, system and method |
| CN110989749B (en) * | 2019-12-24 | 2022-04-05 | 联合汽车电子有限公司 | Silicon controlled rectifier control circuit, system and method |
| CN113357805A (en) * | 2021-05-31 | 2021-09-07 | 青岛海尔空调器有限总公司 | Control method and control device for compressor and air conditioner |
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