CN207780087U - Current detecting protects latch cicuit and air conditioner - Google Patents
Current detecting protects latch cicuit and air conditioner Download PDFInfo
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- CN207780087U CN207780087U CN201721840082.6U CN201721840082U CN207780087U CN 207780087 U CN207780087 U CN 207780087U CN 201721840082 U CN201721840082 U CN 201721840082U CN 207780087 U CN207780087 U CN 207780087U
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Abstract
The utility model provides a kind of current detecting protection latch cicuit and air conditioner.The current detecting protection latch cicuit include：Computing circuit comprising two input terminals and an output end, described two input terminals are respectively first input end and the second input terminal, and the first input end is for inputting a sampled signal, and second input terminal is for inputting a prearranged signals；And positive-feedback circuit, one end is connect with the output end of the computing circuit, the other end is connect with the second input terminal of the computing circuit, the second input terminal for the signal of the computing circuit output end to be fed back to the computing circuit with the signal polarity of positive feedback.Current detecting described in the utility model protection latch cicuit and air conditioner structure are simple, good to the processing promptness of the sampled signal of instantaneous variation, reliability is high.
Description
Technical Field
The utility model relates to a current detection technical field, in particular to current detection protection latch circuit and air conditioner.
Background
At present, in the existing hardware current detection protection circuit, a protection signal obtained by performing operation amplification comparison processing on a sampling signal is usually directly sent to a processor, so that the processor has the defect of untimely and reliable processing on the sampling signal which changes instantly.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a current detection protection latch circuit and air conditioner solves current detection protection circuit to the not timely reliable technical problem of sampling signal processing.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a current sense protection latch circuit comprising: the arithmetic circuit comprises two input ends and an output end, wherein the two input ends are respectively a first input end and a second input end, the first input end is used for inputting a sampling signal, and the second input end is used for inputting a preset signal; and one end of the positive feedback circuit is connected with the output end of the operational circuit, the other end of the positive feedback circuit is connected with the second input end of the operational circuit, and the positive feedback circuit is used for feeding back the signal at the output end of the operational circuit to the second input end of the operational circuit according to the signal polarity of positive feedback.
Furthermore, the positive feedback circuit comprises a diode, the anode of the diode is connected with the output end of the operational circuit, and the cathode of the diode is connected with the second input end of the operational circuit.
Further, the positive feedback circuit comprises a diode and a resistor, wherein the anode of the diode is connected with the output end of the operational circuit, the cathode of the diode is connected with the first end of the resistor, and the second end of the resistor is connected with the second input end of the operational circuit.
Further, the operational circuit comprises a comparator or an operational amplifier, which comprises a same-direction input end and an inverted-direction input end, and when the same-direction input end is larger than the voltage of the inverted-direction input end, the output end of the operational circuit outputs a first voltage; and when the equidirectional input end is smaller than the voltage of the reverse input end, the output end of the operation circuit outputs a second voltage.
Further, the current detection protection latch circuit further includes: the input end of the processor is connected with the output end of the operational circuit and used for receiving the protection signal output by the operational circuit; and the input end of the reset circuit is connected with the output end of the processor, and the output end of the reset circuit is connected with the output end of the operational circuit and is used for resetting the operational circuit according to the reset signal output by the processor.
Further, the current detection protection latch circuit further includes: the input end of the filter circuit is connected with the output end of the arithmetic circuit and is used for receiving the protection signal output by the arithmetic circuit and carrying out filtering processing; the input end of the processor is connected with the output end of the filter circuit and is used for receiving the protection signal subjected to filtering processing; and the input end of the reset circuit is connected with the output end of the processor, and the output end of the reset circuit is connected with the output end of the operational circuit and is used for resetting the operational circuit according to the reset signal output by the processor.
Furthermore, the filter circuit is a capacitor filter circuit, an inductor filter circuit or a duplex filter circuit.
Furthermore, the first input end of the arithmetic circuit is used for inputting a sampling signal Vi, the second input end of the arithmetic circuit is used for inputting a predetermined signal Vp, the positive feedback circuit is used for adding a feedback signal constant a to the second input end, so that the input of the second input end is changed into Vp + a, and the output protection signal of the arithmetic circuit is locked by changing the input of the second input end.
The air conditioner comprises the current detection protection latch circuit, a compressor driving circuit and a compressor, wherein a processor of the current detection protection latch circuit is connected with the compressor driving circuit, the compressor driving circuit is connected with the compressor, and the compressor driving circuit is controlled according to a protection signal received by the processor of the current detection protection latch circuit so as to perform overcurrent protection on the compressor.
Further, the sampling signal is the compressor voltage signal.
Compared with the prior art, current detection protection latch circuit and air conditioner have following advantage:
(1) this novel current detection protection latch circuit and air conditioner include positive feedback circuit, change one of them input of operational circuit through positive feedback circuit to lock operational circuit's output, also lock protection signal state, improved the timeliness and the reliability of the receipt of protection signal and the processing of protection signal.
(2) This novel current detection protection latch circuit and air conditioner includes reset circuit, and the treater is confirmed and is received protection signal and carry out corresponding processing after according the reset signal of treater output will the operational circuit resets, and the reliability is high, and convenient to use has ensured the normal operating of air conditioner.
(3) This is novel to pass through the diode through positive feedback circuit and realize, and feedback signal decay reduces from this, and feedback effect is good, simple structure.
(4) This novel current detection protection latch circuit is for overflowing sampling protection circuit, when overflowing, through positive feedback circuit locking protection signal to guarantee that the treater receives protection signal and in time handles, thereby avoid overflowing the damage that leads to the air conditioner.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is a block diagram of a current detection protection latch circuit according to an embodiment of the present invention.
Fig. 2 is a block diagram of a current detection protection latch circuit according to another embodiment of the present invention.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The utility model provides a current detection protection latch circuit, include:
the arithmetic circuit comprises two input ends and an output end, wherein the two input ends are respectively a first input end and a second input end, the first input end is used for inputting a sampling signal, and the second input end is used for inputting a preset signal; and
and the positive feedback circuit is used for feeding back the signal at the output end of the operational circuit to the second input end of the operational circuit with the signal polarity of positive feedback, so as to change the input of the second input end and lock the output state of the operational circuit.
Specifically, the positive feedback circuit comprises a diode, the anode of the diode is connected with the output end of the operational circuit, and the cathode of the diode is connected with the second input end of the operational circuit, so that the feedback signal attenuation is reduced, the feedback effect is good, and the structure is simple. Or the positive feedback circuit comprises a diode and a resistor, the anode of the diode is connected with the output end of the operational circuit, the cathode of the diode is connected with the first end of the resistor, and the second end of the resistor is connected with the second input end of the operational circuit.
The operational circuit comprises a comparator or an operational amplifier, the comparator or the operational amplifier comprises a same-direction input end and an inverted-direction input end, and when the same-direction input end is larger than the voltage of the inverted-direction input end, the output end of the operational circuit outputs a first voltage; and when the equidirectional input end is smaller than the voltage of the reverse input end, the output end of the operation circuit outputs a second voltage.
More specifically, the current detection protection latch circuit further includes: the input end of the processor is connected with the output end of the operational circuit and used for receiving the protection signal output by the operational circuit; and the input end of the reset circuit is connected with the output end of the processor, and the output end of the reset circuit is connected with the output end of the operational circuit and is used for resetting the operational circuit. Or the current detection protection latch circuit further includes: the input end of the filter circuit is connected with the output end of the arithmetic circuit and is used for receiving the protection signal output by the arithmetic circuit and carrying out filtering processing; the input end of the processor is connected with the output end of the filter circuit and is used for receiving the protection signal subjected to filtering processing; and the input end of the reset circuit is connected with the output end of the processor, and the output end of the reset circuit is connected with the output end of the operational circuit and is used for resetting the operational circuit.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. The filter circuit is a capacitor filter circuit, an inductor filter circuit or a duplex filter circuit
In an embodiment of the present invention, as shown in fig. 1, the current detection protection latch circuit includes: the circuit comprises an arithmetic circuit, a positive feedback circuit, a filter circuit, a processor and a reset circuit; wherein,
the first input end of the arithmetic circuit is used for inputting a sampling signal Vi, and the second input end of the arithmetic circuit is used for inputting a preset signal Vp;
the first end of the positive feedback circuit is connected with the output end of the operational circuit, the second end of the positive feedback circuit is connected with the second input end of the operational circuit, and the positive feedback circuit is used for increasing a feedback signal constant A at the second input end so as to change the input of the second input end into Vp + A, and the input of the second input end of the operational circuit is changed through the positive feedback circuit so as to lock the output Vo of the operational circuit, so that the reliability of an overcurrent protection signal is improved;
the input end of the filter circuit is connected with the output end of the operational circuit, receives Vo output by the output end of the operational circuit, namely a protection signal, and carries out filtering processing on the protection signal;
the processor adopts a singlechip, the input end of the singlechip is connected with the output end of the filter circuit, and the singlechip is used for receiving the protection signal after filtering processing;
the input end of the reset circuit is connected with the output end of the single chip microcomputer, the output end of the reset circuit is connected with the output end of the operational circuit, and after the processor receives and processes the protection signal, the operational circuit is reset according to the reset signal output by the processor, so that the timeliness and the reliability of the processor for receiving and processing the protection signal are improved.
specifically, when Vi is less than β Vp (predetermined input with a certain relation), a result Vo is output by an operation circuit, Vo is output by a filtering process and is sent to a singlechip, in order to prevent the state change of the Vo output by the operation circuit caused by the change of an input sampling signal Vi in the whole circuit processing operation process, a protection signal can not be timely and reliably sent to the singlechip for processing, a diode positive feedback circuit is added between the output Vo and a set input Vp, the state change of the output Vo is ensured to increase a certain constant A to a set input value through a positive feedback circuit after the state of Vi less than β Vp is recovered, the set input value is Vp '═ Vp + A at the moment, the Vi is ensured to be always less than β Vp', the state of the output Vo is kept, and the singlechip outputs a reset signal to forcibly change the state of Vo after receiving the protection signal and.
In another embodiment of the present invention, different from the previous embodiment, the current detection protection latch circuit in this embodiment does not include a filter circuit, and the specific circuit structure is shown in fig. 2, which is not repeated herein.
Additionally, the utility model provides an air conditioner, include current detection protection latch circuit, still include, compressor drive circuit and compressor, current detection protection latch circuit's treater with compressor drive circuit connects, and compressor drive circuit is connected with the compressor, thereby according to thereby the protection signal control compressor drive circuit that current detection protection latch circuit's treater was received carries out overcurrent protection to the compressor.
The sampling signal is the compressor voltage signal, and the current detection protection latch circuit is used for locking the protection signal output by the operational circuit through the positive feedback circuit when overcurrent occurs, so that the processor is ensured to timely receive the protection signal and perform protection processing, and the compressor is controlled to be in a stop operation state, thereby avoiding overcurrent damage.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A current sense protection latch circuit, comprising:
the arithmetic circuit comprises two input ends and an output end, wherein the two input ends are respectively a first input end and a second input end, the first input end is used for inputting a sampling signal, and the second input end is used for inputting a preset signal; and
and one end of the positive feedback circuit is connected with the output end of the operational circuit, and the other end of the positive feedback circuit is connected with the second input end of the operational circuit, and is used for feeding back the signal at the output end of the operational circuit to the second input end of the operational circuit with the signal polarity of positive feedback.
2. The current sense protection latch circuit of claim 1 wherein said positive feedback circuit comprises a diode having an anode connected to said output terminal of said operational circuit and a cathode connected to said second input terminal of said operational circuit.
3. The current sensing protection latch circuit according to claim 1, wherein the positive feedback circuit comprises a diode and a resistor, an anode of the diode is connected to the output terminal of the operational circuit, a cathode of the diode is connected to a first terminal of the resistor, and a second terminal of the resistor is connected to a second input terminal of the operational circuit.
4. The current sense protection latch circuit of claim 1 wherein said operational circuit comprises a comparator or an operational amplifier having a non-inverting input and an inverting input, wherein said output of said operational circuit outputs a first voltage when said non-inverting input is greater than said inverting input; and when the equidirectional input end is smaller than the voltage of the reverse input end, the output end of the operation circuit outputs a second voltage.
5. The current sense protection latch circuit according to claim 1, further comprising:
the input end of the processor is connected with the output end of the operational circuit and used for receiving the protection signal output by the operational circuit; and
and the input end of the reset circuit is connected with the output end of the processor, and the output end of the reset circuit is connected with the output end of the operational circuit and is used for resetting the operational circuit according to the reset signal output by the processor.
6. The current sense protection latch circuit according to claim 1, further comprising:
the input end of the filter circuit is connected with the output end of the arithmetic circuit and is used for receiving the protection signal output by the arithmetic circuit and carrying out filtering processing;
the input end of the processor is connected with the output end of the filter circuit and is used for receiving the protection signal subjected to filtering processing; and
and the input end of the reset circuit is connected with the output end of the processor, and the output end of the reset circuit is connected with the output end of the operational circuit and is used for resetting the operational circuit according to the reset signal output by the processor.
7. The current sense protection latch circuit of claim 6 wherein said filter circuit is a capacitive filter circuit, an inductive filter circuit or a complex filter circuit.
8. The current-sensing protection latch circuit of claim 1, wherein the operational circuit has a first input terminal for inputting a sampling signal Vi and a second input terminal for inputting a predetermined signal Vp, and the positive feedback circuit is configured to add a feedback signal constant a to the second input terminal to change the input of the second input terminal to Vp + a, thereby locking the protection signal output from the operational circuit.
9. An air conditioner, comprising the current detection protection latch circuit according to any one of claims 1 to 8, further comprising a compressor driving circuit and a compressor, wherein a processor of the current detection protection latch circuit is connected to the compressor driving circuit, the compressor driving circuit is connected to the compressor, and the compressor driving circuit is controlled according to a protection signal received by the processor of the current detection protection latch circuit so as to perform overcurrent protection on the compressor.
10. The air conditioner of claim 9, wherein the sampled signal is the compressor voltage signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721840082.6U CN207780087U (en) | 2017-12-25 | 2017-12-25 | Current detecting protects latch cicuit and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721840082.6U CN207780087U (en) | 2017-12-25 | 2017-12-25 | Current detecting protects latch cicuit and air conditioner |
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| CN207780087U true CN207780087U (en) | 2018-08-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114006354A (en) * | 2021-09-16 | 2022-02-01 | 北京无线电测量研究所 | Overcurrent protection circuit |
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2017
- 2017-12-25 CN CN201721840082.6U patent/CN207780087U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114006354A (en) * | 2021-09-16 | 2022-02-01 | 北京无线电测量研究所 | Overcurrent protection circuit |
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