CN211405476U - Unidirectional conduction inversion protection circuit and air conditioner - Google Patents
Unidirectional conduction inversion protection circuit and air conditioner Download PDFInfo
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- CN211405476U CN211405476U CN202020278708.4U CN202020278708U CN211405476U CN 211405476 U CN211405476 U CN 211405476U CN 202020278708 U CN202020278708 U CN 202020278708U CN 211405476 U CN211405476 U CN 211405476U
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Abstract
The utility model discloses a one-way contravariant protection circuit and air conditioner that switches on, one-way contravariant protection circuit includes: the charging circuit and the bypass circuit are connected between the direct current power grid and the load in parallel, a one-way conducting device which only allows current to flow from the charging circuit to the load is arranged in the charging circuit, a switch device which switches the bypass circuit to be switched off or on is arranged in the bypass circuit, and the switch device switches off the bypass circuit when the direct current power grid is powered on until a capacitive component in the load is charged and then switches on the bypass circuit. The utility model discloses can be under the reverse flowing condition of electric current behind the engineering installation, the charging circuit is blocked to the one-way device that switches on, and switching element disconnection bypass circuit, the load of whole circuit disconnection in order to guarantee in the back level circuit does not receive the damage, solves house level safety direct current and supplies with electrical system key problem.
Description
Technical Field
The utility model relates to an inversion protection circuit technical field especially relates to one-way conduction inversion protection circuit and air conditioner.
Background
The majority of household air conditioners are supplied with power by alternating current 220Vac/50Hz, the traditional alternating current power supply grid has the problem of low power transmission and distribution efficiency, and meanwhile, certain potential safety and reliability hazards exist in the use process of high-voltage household appliances. Along with the rapid development of energy internet technology, areas such as new district of stamina ann adopt direct current electric wire netting power supply at present, prevent among the prior art that to go up the electric shock function in the twinkling of an eye all based on traditional alternating current power supply electric wire netting design, for example patent application No. 200710079631.7 and patent application No. 201510050734.5's utility model patent, this kind of circuit can't prevent when direct current electric wire netting that positive negative pole connects the mistake, and in case positive negative pole connects the mistake and leads to behind the reverse flow of electric current, very probably causes the electrical apparatus to damage or even the conflagration takes.
Therefore, how to design a unidirectional conduction inverter protection circuit and an air conditioner suitable for a dc power grid is an urgent technical problem to be solved in the industry.
SUMMERY OF THE UTILITY MODEL
In order to solve the defect that the current power supply control circuit can not prevent reverse current, the utility model provides a one-way contravariant protection circuit and air conditioner that switch on.
The utility model discloses a technical scheme be, design one-way inverter protection circuit that switches on, include: the charging circuit and the bypass circuit are connected between the direct current power grid and the load in parallel, a one-way conducting device which only allows current to flow from the charging circuit to the load is arranged in the charging circuit, a switch device which switches the bypass circuit to be switched off or on is arranged in the bypass circuit, and the switch device switches off the bypass circuit when the direct current power grid is powered on until a capacitive component in the load is charged and then switches on the bypass circuit.
Preferably, the switch element is connected with a main control board of the load, and the main control board detects the charging parameters of the capacitive element in the load where the main control board is located so as to control the on-off state of the switch element.
Preferably, the switch member is a relay, and the contact of the relay is in a normally open state.
Preferably, the maximum reverse voltage that the unidirectional device can withstand is greater than the maximum input voltage of the dc network.
Preferably, the one-way conduction device is a diode, the charging circuit is formed by connecting the diode and a resistor in series, the positive end of the diode is connected with the anode of the direct-current power grid, the negative end of the diode is connected with one end of the resistor, and the other end of the resistor is connected with the load.
Preferably, the unidirectional conduction inverter protection circuit includes: the output end of the filter circuit is connected with the load, and the charging circuit and the bypass circuit are connected in parallel between the input end of the filter circuit and the direct current power grid.
Preferably, the unidirectional conducting inverter protection circuit further includes: the input end of the anti-surge circuit is connected with the direct current power grid, and the charging circuit and the bypass circuit are connected in parallel between the output end of the anti-surge circuit and the load.
The utility model also provides an air conditioner, this air conditioner's drive control circuit adopts foretell one-way contravariant protection circuit that switches on, and wherein, the load among the one-way contravariant protection circuit that switches on includes: compressor drive circuit, fan drive circuit, main control board and switching power supply.
Compared with the prior art, the utility model discloses can be under the reverse flowing condition of electric current behind the engineering installation, charging circuit is blocked to the one-way device that switches on, and switching element disconnection bypass circuit, the load of whole circuit disconnection in order to guarantee in the back stage circuit does not receive the damage. Furthermore, the switch is disconnected when the direct current power grid is electrified, the current is sent to the load through the charging circuit, the effect of preventing the capacitive element in the load from being damaged by the electrification instant impact is achieved, the switch is closed until the capacitive element is charged, and the large current is sent to the load through the bypass circuit, so that the normal operation of the load is guaranteed.
Drawings
The invention is explained in more detail below with reference to exemplary embodiments and the accompanying drawings, in which:
fig. 1 is an overview diagram of a unidirectional-conduction inverter protection circuit of the present invention;
fig. 2 is a schematic block diagram of the unidirectional-conduction inverter protection circuit of the present invention.
Detailed Description
As shown in fig. 1, the utility model provides a one-way contravariant protection circuit that switches on is applicable to the direct current power supply system, and the electric wire netting adopts full direct current mode to supply power to user's family, and the load is connected on the direct current power supply through this protection circuit.
The protection circuit includes: the charging circuit 1 and the bypass circuit 2 are connected between the direct current power grid 9 and a load in parallel, the resistance value of the charging circuit 1 is larger than that of the bypass circuit 2, a one-way conducting device which only allows current to flow from the charging circuit 1 to the load is arranged in the charging circuit 1, and a switch device which switches the charging circuit 1 to be switched on or off is arranged in the bypass circuit 2. It should be noted that, when the charging circuit 1 and the bypass circuit 2 are both disconnected, the dc grid 9 is disconnected from the load, and the load is in a power-off state.
In actual use, the following two cases exist:
the first is that the connection of the positive pole and the negative pole of the protection circuit is correct, the bypass circuit 2 is disconnected when the switch element is electrified on the direct current power grid 9, the load is connected on the direct current power grid 9 through the charging circuit 1, the capacitive components in the load start to be charged, the resistance value of the charging circuit 1 is large, the current limiting effect can be achieved, the capacitive components in the load are prevented from being damaged by the instantaneous impact of electrification, the bypass circuit 2 is connected after the capacitive components are charged, the load is connected on the direct current power grid through the charging circuit 1 and the bypass circuit 2 which are connected in parallel, and the large current flows through the bypass circuit 2 with the small resistance value.
The second type is that the anode and the cathode of the protection circuit are connected wrongly, the bypass circuit 2 is disconnected by the switch piece when the direct current power grid 9 is electrified, the current flows reversely, the charging circuit 1 is blocked by the one-way conduction device, the charging circuit 1 and the bypass circuit 2 are disconnected at the moment, the direct current power grid 9 is separated from the load, the load cannot run, and the electric components of the load cannot be damaged, so that the effect of protecting the electric appliance is achieved.
In a preferred embodiment, the switch element is connected to a main control board of the load, the main control board detects a charging parameter of the capacitive element in the load where the main control board is located to control the on-off state of the switch element, the charging parameter may be a voltage value, that is, the main control board determines whether the charging of the capacitive element is completed according to the voltage values at the two ends of the capacitive element. Furthermore, the bypass circuit 2 is composed of a switch member, the switch member is a relay 7, and the contact of the relay 7 is in a normally open state, that is, the contact of the relay 7 is opened when the coil of the relay 7 is not energized.
When the positive and negative electrodes of the protection circuit are correctly connected, the contact of the relay 7 is in a normally open state at the initial stage of electrification, the bypass circuit 2 is disconnected, the capacitive element is charged through the charging circuit, when the main control board detects that the capacitive element is charged, the main control board energizes the coil of the relay 7, the contact of the relay 7 is attracted, the bypass circuit 2 is switched on, and the load normally operates.
Under the state that the positive pole and the negative pole of the protection circuit are connected wrongly, the contact of the relay 7 is in a normally open state at the initial stage of electrification, the bypass circuit 2 is disconnected, the charging circuit 1 is disconnected by the one-way conduction device, the main control board cannot be electrified, so that the coil of the relay 7 cannot be electrified, the contact of the relay 7 cannot be attracted and conducted, the direct-current power grid 9 is separated from the load, the load cannot run, and the electric appliance components cannot be damaged, so that the effect of protecting the electric appliance is achieved.
In order to improve the safety and reliability of the circuit, the maximum reverse voltage which can be borne by the unidirectional conducting device is greater than the maximum input voltage of the direct-current power grid 9, and the unidirectional conducting device can block the charging circuit 1 when the current reversely flows. The unidirectional conduction inversion protection circuit further comprises a filter circuit 3 and an anti-surge circuit 4, the output end of the filter circuit 3 is connected to a load, the input end of the anti-surge circuit 4 is connected to a direct current power grid 9, and the charging circuit 1 and the bypass circuit 2 are connected between the anti-surge circuit 4 and the filter circuit 3 in parallel.
As shown in fig. 2, more specifically, the one-way conduction device is a diode 5, the charging circuit 1 is formed by connecting the diode 5 and a resistor 6 in series, the positive terminal of the diode 5 is connected to the positive electrode of the dc power grid 9, the negative terminal of the diode 5 is connected to one end of the resistor 6, and the other end of the resistor 6 is connected to the load.
When the positive and negative electrodes of the protection circuit are connected correctly, the contact of the relay 7 is in a normally open state at the initial stage of electrification, the bypass circuit 2 is disconnected, after the current of the direct-current power grid 9 passes through the anti-surge circuit 4, the diode 5, the resistor 6 and the filter circuit 3, a stable and reliable power supply is provided for a load, a capacitive component in the load starts to be charged, when the main control board detects that the capacitive component is charged, the main control board energizes the coil of the relay 7, the contact of the relay 7 is closed, the bypass circuit 2 is connected, the charging circuit 1 is bypassed, large current flows through the contact of the relay 7, and the load normally operates.
Under the state that the positive pole and the negative pole of the protection circuit are connected wrongly, the contact of the relay 7 is in a normally open state at the initial stage of electrification, the bypass circuit 2 is disconnected, the diode 5 is disconnected from the charging circuit 1, the main control board cannot be electrified, so that the coil of the relay 7 cannot be electrified, the contact of the relay 7 cannot be attracted and conducted, the direct-current power grid 9 is separated from the load, the load cannot run, and electrical components of the direct-current power grid cannot be damaged, so that the effect of protecting an electrical appliance is achieved.
The utility model provides an above-mentioned protection circuit can judge in advance and break off whole circuit under the reverse flowing condition of electric current behind the engineering installation to guarantee that the device in the back stage circuit does not receive the damage.
The utility model also provides an air conditioner, air conditioner's drive plate is equipped with drive control circuit, and drive control circuit adopts foretell one-way conduction you to become protection circuit, and the load among the one-way conduction inverter protection circuit includes: compressor drive circuit, fan drive circuit, main control board and switching power supply. When the positive electrode of a driving plate of the air conditioner is connected with the positive electrode of a direct-current power grid, and the negative electrode of the driving plate is connected with the negative electrode of the direct-current power grid, the protection circuit is correctly connected, and the air conditioner normally works after being connected with electricity; when the positive electrode of a driving plate of the air conditioner is connected with the negative electrode of a direct current power grid, and the negative electrode of the driving plate is connected with the positive electrode of the direct current power grid, the air conditioner is automatically protected, the direct current power grid is separated from a load, and the air conditioner does not work.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A unidirectional-conduction inverter protection circuit, comprising: the charging circuit and the bypass circuit are connected between a direct current power grid and a load in parallel, a one-way conducting device which only allows current to flow from the charging circuit to the load is arranged in the charging circuit, and a switch device which switches the charging circuit to be switched on or off is arranged in the bypass circuit.
2. The unidirectional flux inversion protection circuit of claim 1, wherein the switching element disconnects the bypass circuit when the dc power grid is powered up until the capacitive element in the load is charged and then the bypass circuit is connected.
3. The unidirectional-conduction inverter protection circuit of claim 2, wherein the switch element is connected with a main control board of the load, and the main control board detects the charging parameters of a capacitive element in the load where the main control board is located so as to control the on-off state of the switch element.
4. A unidirectional flux inversion protection circuit as claimed in claim 3, wherein said switching element is a relay, and contacts of said relay are normally open.
5. A unidirectionally conducting inverter protection circuit according to claim 1, wherein said unidirectionally conducting devices are capable of withstanding a maximum reverse voltage that is greater than a maximum input voltage of said dc electrical network.
6. The unidirectional-conduction inverter protection circuit according to any one of claims 1 to 5, wherein the unidirectional-conduction device is a diode, the charging circuit is formed by connecting a diode and a resistor in series, the positive terminal of the diode is connected with the anode of the DC power grid, the negative terminal of the diode is connected with one end of the resistor, and the other end of the resistor is connected with the load.
7. The unidirectional conducting inverter protection circuit according to any one of claims 1 to 5, further comprising: the output end of the filter circuit is connected to the load, and the charging circuit and the bypass circuit are connected in parallel between the input end of the filter circuit and the direct current power grid.
8. The unidirectional conducting inverter protection circuit according to any one of claims 1 to 5, further comprising: the input end of the anti-surge circuit is connected with the direct current power grid, and the charging circuit and the bypass circuit are connected in parallel between the output end of the anti-surge circuit and the load.
9. An air conditioner, characterized in that, the drive control circuit of the air conditioner adopts the unidirectional conduction inversion protection circuit of any one of claims 1 to 8.
10. The air conditioner according to claim 9, wherein the load comprises: compressor drive circuit, fan drive circuit, main control board and switching power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020278708.4U CN211405476U (en) | 2020-03-09 | 2020-03-09 | Unidirectional conduction inversion protection circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020278708.4U CN211405476U (en) | 2020-03-09 | 2020-03-09 | Unidirectional conduction inversion protection circuit and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211405476U true CN211405476U (en) | 2020-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020278708.4U Active CN211405476U (en) | 2020-03-09 | 2020-03-09 | Unidirectional conduction inversion protection circuit and air conditioner |
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| Country | Link |
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| CN (1) | CN211405476U (en) |
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2020
- 2020-03-09 CN CN202020278708.4U patent/CN211405476U/en active Active
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