CN213279185U - Reverse connection preventing device - Google Patents
Reverse connection preventing device Download PDFInfo
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- CN213279185U CN213279185U CN202020517020.7U CN202020517020U CN213279185U CN 213279185 U CN213279185 U CN 213279185U CN 202020517020 U CN202020517020 U CN 202020517020U CN 213279185 U CN213279185 U CN 213279185U
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- comparator
- reverse connection
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Abstract
An anti-reverse connection device is coupled between a power supply and an object to be detected and comprises a relay switch, a control unit and a voltage detection unit; the relay switch is coupled on a connecting passage of the bidirectional power supply and the object to be detected and is used for switching on or off the connection of the bidirectional power supply and the object to be detected; the voltage detection unit is used for detecting the voltage difference between two ends of the relay switch and the voltage of the object end to be detected; and the control unit is used for receiving the voltage difference between the two ends of the relay and the voltage of the object end to be detected, outputting a level signal to the relay control circuit through the comparison circuit and the logic gate circuit, and controlling the on-off of the relay. The device can carry out random reverse connection prevention protection on the power supply and the object to be tested, and has the function of pre-charging and preventing sparking.
Description
Technical Field
The utility model relates to a power protection field, concretely relates to prevent reverse connection device that is used for when power is connected with the determinand.
Background
At present, only the reverse connection prevention scheme aiming at charging the battery by a unidirectional power supply is available in the market, and the reverse connection prevention scheme has the defects that the bidirectional connection is unavailable or the fuse needs to be replaced. One solution is to add a diode in the path between the unidirectional power supply and the battery, and to perform reverse connection prevention through the unidirectional conductivity of the diode, but in this way, only the battery can be charged, and the battery cannot be discharged, and meanwhile, the bidirectional power supply cannot be supported. The other scheme is that a fuse and a diode are additionally arranged in a path between a unidirectional power supply and a battery, when power supply ends are reversely connected, current passes through the diode and the fuse, the current exceeds the rated current of the fuse, and the fuse is damaged and replaced.
Disclosure of Invention
To the above problems, the present invention provides an anti-reverse connection device, which further can pre-charge the scheme of preventing the ignition function, and can effectively protect the bi-directional power supply or the object (battery) to be tested from damage during the protection.
An anti-reverse connection device coupled between a power source and an object to be tested, comprising:
the relay switch is coupled on a connecting path of the power supply and the object to be detected and used for connecting or disconnecting the power supply and the object to be detected;
the voltage detection unit is used for detecting the voltage difference between two ends of the relay switch and the voltage of the object end to be detected;
and the control unit receives the voltage of the end of the object to be tested and compares the voltage with the threshold voltage of the object to be tested, outputs a first comparison signal, receives the voltage difference between two ends of the relay switch and compares the voltage with the threshold voltage of the relay, outputs a second comparison signal, and controls the on or off of the relay switch according to the first and second comparison signals.
Further, the control unit comprises a comparison circuit, a logic gate circuit and a relay control circuit which are coupled in sequence.
Furthermore, the comparison circuit comprises a first comparator and a second comparator, two input ends of the first comparator are respectively connected with the voltage of the object end to be measured and the threshold voltage of the object to be measured, and the input end of the second comparator is respectively connected with the voltage difference of two ends of the relay switch and the upper limit value and the lower limit value of the threshold voltage of the relay.
Furthermore, the logic gate circuit is an and gate, the input end of the and gate is connected with the output end of the first comparator and the output end of the second comparator, and the output end of the and gate is connected with the relay control circuit.
Further, when the first and second comparison signals are both at a high level, the relay switch is controlled to be turned on.
Further, the relay switch is also connected with a pre-charging circuit in parallel.
Further, the pre-charge circuit includes a constant current source and a diode connected in series.
The utility model discloses the beneficial effect who reaches does: the device provides the reverse connection preventing device, can perform random reverse connection preventing protection on the bidirectional power supply and the object to be tested, further can perform a scheme with a pre-charging ignition preventing function, and can effectively protect the object to be tested such as the bidirectional power supply or a battery and the like to prevent damage during the protection period.
Drawings
Fig. 1 is a schematic structural diagram of the reverse connection preventing device in the embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a control unit of the reverse connection preventing device in the embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings.
In this embodiment, only the battery is used as the object to be measured for detailed description, and those skilled in the art will understand that the object to be measured is not limited to the battery, and may be other bidirectional sources or capacitors. As shown in fig. 1, the reverse connection preventing device is arranged in a path connecting a bidirectional power supply and a battery to be tested, one end (VI + \ VI-) of the reverse connection preventing device is connected with the bidirectional power supply, and the other end (VO + \ VO-) of the reverse connection preventing device is connected with the battery to be tested, and includes a control unit, a relay switch and a voltage detecting unit, wherein the voltage detecting unit includes a voltmeter, the voltmeter detects a voltage difference at two ends of the relay and a voltage at the battery end respectively, the detected voltage is sent to the control unit, and the control unit controls the relay switch to be turned on or off through a relay control circuit; the relay switch is also connected in parallel with a pre-charge circuit, which includes a constant current source and an anti-reverse diode connected in series with the constant current source.
Referring to fig. 2, the detailed description of each circuit is provided, and the control unit includes a comparison circuit, a logic gate circuit and a relay control circuit, which are coupled in sequence. The comparison circuit comprises a first comparator 1 and a second comparator 2, the second comparator is a window comparator, the logic gate circuit is an AND gate, the output ends of the first comparator and the second comparator are respectively connected to the AND gate, the AND gate is connected to the relay control circuit, and the relay control circuit controls the on or off of the relay switch.
Two input ends of the first comparator are respectively connected with a voltage VO of the object end to be detected and a threshold voltage VTH1 of the object to be detected, and the input end of the second comparator is respectively connected with a voltage difference DV between two ends of a relay switch, an upper limit value VTH + and a lower limit value VTH-of the threshold voltage of the relay. The threshold voltage VTH1 of the object to be tested, the upper limit value VTH + and the lower limit value VTH-of the threshold voltage of the relay are set during design, and the authority of the set value can also be given to subsequent users and set by the users.
The reverse connection preventing device collects the battery terminal voltage VO, sends the battery terminal voltage VO into the control unit to be compared with the threshold voltage VTH1 of the comparator 1, and outputs a comparison signal. In the present embodiment, the positive terminal VO + of the battery is connected to ground GND, and the battery is not inverted when VO < VTH1 is defined, and in other embodiments, it is known to those skilled in the art that the battery is not inverted when VO > VTH1 is defined if the negative terminal VO + of the battery is connected to ground GND, in short, when the battery is determined not to be inverted, the comparator 1 outputs a high level, and when the battery is inverted, the comparator 1 outputs a low level, and the comparison signal is sent to the and gate. Meanwhile, the reverse connection preventing device collects the differential pressure DV (namely the differential pressure value of the bidirectional power supply and the battery end) at the two ends of the relay contact and carries out window comparison with the threshold voltages VTH + and VTH-of the window comparator 2, and a comparison signal is output. When the voltage value of DV is between VTH-value and VTH + value, the window comparator 2 outputs high level, if the voltage value of DV is greater than VTH + or less than VTH-value, the window comparator 2 outputs low level, and send the signal to AND gate too. When the voltage VO of the battery terminal is not reversely connected and the differential pressure DV value at the two ends of the relay contact is between the VTH-value and the VTH + value, the AND gate outputs high level, the relay contact is attracted, and the bidirectional power supply can normally charge and discharge the battery.
The relay switch is arranged on a positive connection circuit of the bidirectional power supply and the battery to be tested, one end of the relay switch is connected with the bidirectional power supply, the other end of the relay switch is connected with the battery to be tested, the voltage difference between two ends of a relay contact is the voltage difference value between the bidirectional power supply and the battery end, when the voltage difference value is out of a voltage difference threshold value, if the voltage of the battery to be tested is higher than the voltage of the bidirectional power supply, the battery can pre-charge the bidirectional power supply through the constant current source A1 and the anti-reverse diode D1 until the voltage difference between two ends of the relay contact reaches a preset value, and therefore the function can prevent instant ignition of the battery due. If the battery voltage is lower than the bi-directional power supply voltage, the bi-directional power supply will not pre-charge the battery at this time because D1 has the function of unidirectional conductivity.
When the output end of the bidirectional power supply is reversely connected, due to the characteristics of the body diode of the power tube MOSFET in the power supply, the battery discharges through the combination of the constant current source A1 and the diode D1 and the body diode of the power tube in the bidirectional power supply, at the moment, the voltage difference DV between two ends of the relay contact is approximately equal to the voltage between two ends of the battery minus the voltage drop of the diode, and in fact, the voltage drop between the voltage of the battery end minus the diode is far larger than the threshold voltage of the relay contact, namely, the DV value cannot be between the VTH-value and the VTH + value, so that the relay contact. Therefore, the utility model discloses a circuit, even power termination is reverse, the relay still can't switch on, still plays the effect of protection.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment, but all equivalent modifications or changes made by those skilled in the art according to the present invention should be included in the protection scope of the claims.
Claims (6)
1. An anti-reverse connection device coupled between a power source and an object to be tested, comprising:
the relay switch is coupled on a connecting path of the power supply and the object to be detected and used for connecting or disconnecting the power supply and the object to be detected;
the voltage detection unit is used for detecting the voltage difference between two ends of the relay switch and the voltage of the object end to be detected;
and the control unit receives the voltage of the end of the object to be tested and compares the voltage with the threshold voltage of the object to be tested, outputs a first comparison signal, receives the voltage difference between two ends of the relay switch and compares the voltage with the threshold voltage of the relay, outputs a second comparison signal, and controls the on or off of the relay switch according to the first and second comparison signals.
2. An anti-reverse connection device according to claim 1, characterized in that: the control unit comprises a comparison circuit, a logic gate circuit and a relay control circuit which are coupled in sequence.
3. An anti-reverse connection device according to claim 2, characterized in that: the comparison circuit comprises a first comparator and a second comparator, wherein two input ends of the first comparator are respectively connected with the voltage of the object end to be detected and the threshold voltage of the object to be detected, and the input end of the second comparator is respectively connected with the voltage difference of two ends of the relay switch and the upper limit value and the lower limit value of the threshold voltage of the relay.
4. An anti-reverse connection device according to claim 3, characterized in that: the logic gate circuit is an AND gate, the input end of the AND gate is connected with the output end of the first comparator and the output end of the second comparator, and the output end of the AND gate is connected with the relay control circuit.
5. An anti-reverse attachment apparatus according to any one of claims 1 to 4, wherein: the relay switch is also connected with a pre-charging circuit in parallel.
6. An anti-reverse connection device according to claim 5, characterized in that: the pre-charge circuit comprises a constant current source and a diode connected in series with the constant current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020517020.7U CN213279185U (en) | 2020-04-10 | 2020-04-10 | Reverse connection preventing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020517020.7U CN213279185U (en) | 2020-04-10 | 2020-04-10 | Reverse connection preventing device |
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| Publication Number | Publication Date |
|---|---|
| CN213279185U true CN213279185U (en) | 2021-05-25 |
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| CN202020517020.7U Active CN213279185U (en) | 2020-04-10 | 2020-04-10 | Reverse connection preventing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111509797A (en) * | 2020-04-10 | 2020-08-07 | 艾乐德电子（南京）有限公司 | Reverse connection preventing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111509797A (en) * | 2020-04-10 | 2020-08-07 | 艾乐德电子（南京）有限公司 | Reverse connection preventing device |
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| GR01 | Patent grant | ||
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: ITECH ELECTRONIC Co.,Ltd. Assignor: ILD ELECTRONIC Co.,Ltd. Contract record no.: X2022980013801 Denomination of utility model: An anti-reverse connection device Granted publication date: 20210525 License type: Common License Record date: 20220901 |