CN219107098U - Pre-discharge circuit - Google Patents
Pre-discharge circuit Download PDFInfo
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- CN219107098U CN219107098U CN202223423297.1U CN202223423297U CN219107098U CN 219107098 U CN219107098 U CN 219107098U CN 202223423297 U CN202223423297 U CN 202223423297U CN 219107098 U CN219107098 U CN 219107098U
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- 238000005070 sampling Methods 0.000 claims description 22
- 239000003990 capacitor Substances 0.000 claims description 10
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model relates to the field of solar energy, in particular to a pre-discharge circuit; the pre-discharge circuit comprises a first switch unit, a pre-discharge unit and a second switch unit, wherein the pre-discharge unit comprises a first resistor and a first MOS tube which are connected in series, the input end of the first switch unit is connected with a discharge battery, the first output end of the first switch unit is electrically connected with the first, the second output end of the first switch unit is connected with the input end of the second switch unit, and the output end of the second switch unit and the source electrode of the first MOS tube are connected with an external load; according to the utility model, by adding one pre-discharge unit connected in parallel between the battery and the load, when the battery starts to discharge the load, the pre-discharge unit is controlled to be started, the current is limited by the first resistor in the pre-discharge unit, so that the triggering of load short-circuit protection is effectively prevented, and the first resistor can also perform short-circuit protection during short-circuit, and inhibit the rising of peak voltage.
Description
Technical Field
The utility model relates to the field of solar energy, in particular to a pre-discharge circuit.
Background
When the existing solar controller controls the battery to supply power to the load, the controller is connected with the battery and controls the MOS tube switch to directly discharge the load, as most of the load is a capacitive load, a plurality of large capacitors are generally arranged in the capacitive load, when the battery discharges the load, the instant discharging current is large, and if the direct discharging is easy to cause the load short circuit, the load short circuit protection is triggered.
It is therefore of great importance to those skilled in the art to design a pre-discharge circuit that will prevent the controller load from shorting out due to excessive battery discharge current.
Disclosure of Invention
The utility model aims to solve the technical problems by providing the pre-discharge circuit capable of avoiding the short circuit of the load of the controller caused by the overlarge instant discharge current of the battery, and overcoming the defects that the instant discharge current is large when the battery discharges the load in the prior art, and the load is burnt out due to the short circuit of the load if the direct discharge is easy to cause.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a pre-discharge circuit for in solar controller, its preferred scheme lies in: the pre-discharge circuit comprises a first switch unit, a pre-discharge unit and a second switch unit, wherein the pre-discharge unit comprises a first resistor and a first MOS tube, the first resistor is connected with the first MOS tube in series, the input end of the first switch unit is connected with a discharge battery, the first output end of the first switch unit is connected with one end of the first resistor, the second output end of the first switch unit is connected with the input end of the second switch unit, and the output end of the second switch unit and the source electrode of the first MOS tube are connected with an external load.
The preferred scheme is as follows: the pre-discharge circuit further comprises a current sampling circuit, one end of the current sampling circuit is connected with the output end of the first switch unit, and the other end of the current sampling circuit is connected with the input end of the pre-discharge unit.
The preferred scheme is as follows: the current sampling circuit comprises a second resistor and a third resistor, the second resistor is connected with the third resistor in parallel, and sampling points are arranged at two ends of the third resistor.
The preferred scheme is as follows: the first switch unit comprises a plurality of MOS (metal oxide semiconductor) tubes, the sources of the MOS tubes are connected with the discharge battery, and the drains of the MOS tubes are connected with the input end of the pre-discharge unit.
The preferred scheme is as follows: the first switch unit comprises two MOS tubes, namely a second MOS tube and a third MOS tube, wherein the source electrode of the second MOS tube and the source electrode of the third MOS tube are connected with a discharge battery, the drain electrode of the second MOS tube and the drain electrode of the third MOS tube are connected to the input end of the pre-discharge unit, and the grid electrode of the second MOS tube is connected with the grid electrode of the third MOS tube.
The preferred scheme is as follows: a fourth resistor and a fifth resistor are further arranged between the grid electrode of the second MOS tube and the grid electrode of the third MOS tube, and the fourth resistor is connected in series with the fifth resistor.
The preferred scheme is as follows: the second switch unit comprises a plurality of MOS (metal oxide semiconductor) tubes, the sources of the MOS tubes are connected with a load, and the drains of the MOS tubes are connected with the second output end of the first switch unit.
The preferred scheme is as follows: the second switch unit comprises a fourth MOS tube and a fifth MOS tube, the drain electrode of the fourth MOS tube and the drain electrode of the fifth MOS tube are connected with the second output end of the first switch unit, the source electrode of the fourth MOS tube and the source electrode of the fifth MOS tube are connected with a load, and the grid electrode of the fourth MOS tube is connected with the grid electrode of the fifth MOS tube.
The preferred scheme is as follows: the grid electrode of the fourth MOS tube and the grid electrode of the fifth MOS tube are both connected to the second output end of the first switch unit, and a filter circuit is further arranged between the grid electrode of the fourth MOS tube and the second output end of the first switch unit and between the grid electrode of the fifth MOS tube and the second output end of the first switch unit.
The preferred scheme is as follows: the filter circuit comprises a first capacitor, a sixth resistor and a second capacitor which are connected in series.
Compared with the prior art, the utility model has the beneficial effects that by adding one pre-discharge unit connected in parallel between the battery and the load, when the battery starts discharging the load, the pre-discharge unit is controlled to be started, the first switch unit and the second switch unit of the main circuit are controlled to be closed, the current is limited by the first resistor in the pre-discharge unit, the triggering of the controller load short-circuit protection is effectively prevented, and further, the first resistor can also perform short-circuit protection during short-circuit, and the rising of peak voltage is restrained.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a circuit diagram of a pre-discharge circuit according to the present utility model;
FIG. 2 is a circuit diagram of a pre-discharge circuit according to the present utility model;
fig. 3 is a circuit diagram three of a pre-discharge circuit in the present utility model.
Detailed Description
Preferred embodiments of the present utility model will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1 to 3, the present utility model provides a preferred embodiment of a pre-discharge circuit.
The pre-discharge circuit is used in a solar controller, and referring to fig. 1, the pre-discharge circuit comprises a first switch unit 1, a pre-discharge unit 2 and a second switch unit 3, wherein the input end of the first switch unit 1 is connected with an external discharge battery, the first output end of the first switch unit 1 is connected with the input end of the pre-discharge unit 2, the second output end of the first switch unit 1 is connected with the input end of the second switch unit 3, the output end of the pre-discharge unit 2 is connected with an external load, and the output end of the second switch unit 3 is connected with the external load.
In one embodiment, referring to fig. 1, the pre-discharge unit 2 includes a first resistor R1 and a first MOS transistor Q1, where the first resistor R1 and the first MOS transistor Q1 are connected in series, specifically, one end of the first resistor R1 is connected to the first output end of the first switch unit 1, the other end of the second resistor R2 is connected to the drain of the first MOS transistor Q1, and the source of the first MOS transistor Q1 is connected to an external load.
In the existing solar discharging circuit, a solar controller is connected with a battery, and controls on-off of a MOS tube switch to directly discharge a load, and because the battery is a capacitive load, the battery internally comprises a plurality of large capacitors, when the MOS tube switch is conducted and the battery discharges an external load, the discharging current released by the battery is large, so that the load of the controller is easily short-circuited and the load short-circuit protection of the controller is triggered.
In the embodiment, by adding a pre-discharge unit which is connected in parallel between the battery and the load, and controlling the pre-discharge unit to be started and controlling the first switch unit and the second switch unit of the main circuit to be closed when the battery starts discharging the load, the current is limited by using the first resistor in the pre-discharge unit, the triggering of the controller load short-circuit protection is effectively prevented, and further, the first resistor can also perform short-circuit protection during short-circuit, and the rising of peak voltage is restrained.
In one embodiment, the pre-discharge circuit further includes a current sampling circuit, one end of the current sampling circuit is connected to the output end of the first switch unit 1, and the other end of the current sampling circuit is connected to the input end of the pre-discharge unit 2.
Specifically, the current sampling circuit is mainly used for current sampling, obtains a load capacitor according to pulse current, and is used for adaptively adjusting the discharge time of equipment, and the sampling circuit can also adopt voltage sampling to adjust the pre-discharge time according to voltage; it should be noted that, when the specific sampling scenario is the first time of using the load, the first switch unit 1 and the second switch unit 3 are turned on, and the pre-discharge unit 2 is turned off.
In one embodiment, and referring to fig. 2, the current sampling circuit includes a second resistor R2 and a third resistor R3, where the second resistor R2 is connected in parallel with the third resistor R3, and sampling points are disposed at two ends of the third resistor R3.
Specifically, one end of the second resistor R2 is connected to the output end of the first switch unit 1, the other end of the second resistor R2 is connected to the input end of the pre-discharge unit 2 and the input end of the second switch unit 3, and the third resistor R3 is connected in parallel to the second resistor R2, and two sampling points are left and right at two ends of the third circuit, so as to obtain current or voltage at two ends of the third resistor R3, and further obtain a load capacitance.
When the load is started each time, the first MOS tube Q1 in the pre-discharge unit is started first, the load input capacitor is discharged through the positive electrode of the storage battery, the first resistor R1 used for limiting current, the first MOS tube Q1 used for pre-discharging, the positive electrode of the load and the negative electrode of the load, the conduction time of the first MOS tube Q1 used for pre-discharging can be set, and whether the discharge is ended can be judged through the sampling current of the second resistor R2 and the third resistor R3. And after the pre-discharge is finished, the main load switch is turned on.
In one embodiment, referring to fig. 3, the first switch unit 1 includes a plurality of MOS transistors, sources of the MOS transistors are all connected to a discharge battery, and drains of the MOS transistors are all connected to an input end of the pre-discharge unit 2.
Specifically, referring to fig. 3, the first switching unit 1 includes a plurality of MOS transistors, where the MOS transistors are used for switching, and since the current allowed to pass through each MOS transistor is limited, if only one MOS transistor is used as a switch, the current transmitted to the load is limited, so that the discharge is slow; in order to improve the discharge efficiency under the premise of safe discharge, in this embodiment, the first switch unit 1 is provided with a plurality of MOS transistors.
In one embodiment, referring to fig. 3, the first switch unit 1 includes two MOS transistors, which are a second MOS transistor Q2 and a third MOS transistor Q3, a source of the second MOS transistor Q2 and a source of the third MOS transistor Q3 are both connected to the discharge battery, a drain of the second MOS transistor Q2 and a drain of the third MOS transistor Q3 are both connected to an input end of the pre-discharge unit 2, and a gate of the second MOS transistor Q2 is connected to a gate of the third MOS transistor Q3.
In one embodiment, referring to fig. 3, a fourth resistor R4 and a fifth resistor R5 are further disposed between the gate of the second MOS transistor Q2 and the gate of the third MOS transistor Q3, and the fourth resistor R4 is connected in series with the fifth resistor R5.
In one embodiment, referring to fig. 3, the second switching unit 3 includes a plurality of MOS transistors, sources of the MOS transistors are all connected to a load, and drains of the MOS transistors are all connected to the second output terminal of the first switching unit 1.
Specifically, referring to fig. 3, the second switching unit 3 includes a plurality of MOS transistors, where the MOS transistors are used for switching, and since the current allowed to pass through each MOS transistor is limited, if only one MOS transistor is used as a switch, the current transmitted to the load is limited, so that the discharge is slow; in order to improve the discharge efficiency under the premise of safe discharge, in this embodiment, the first switch unit 1 is provided with a plurality of MOS transistors.
In one embodiment, referring to fig. 3, the second switching unit 3 includes a fourth MOS transistor Q4 and a fifth MOS transistor Q5, the drain of the fourth MOS transistor Q4 and the drain of the fifth MOS transistor Q5 are both connected to the second output end of the first switching unit 1, the source of the fourth MOS transistor Q4 and the source of the fifth MOS transistor Q5 are both connected to a load, and the gate of the fourth MOS transistor Q4 is connected to the gate of the fifth MOS transistor Q5.
In one embodiment, referring to fig. 3, a seventh resistor R7 and an eighth resistor R8 are further disposed between the gate of the fourth MOS transistor Q4 and the gate of the fifth MOS transistor Q5, and the seventh resistor R7 is connected in series with the eighth resistor R8.
In one embodiment, referring to fig. 3, the gate of the fourth MOS transistor Q4 and the gate of the fifth MOS transistor Q5 are both connected to the second output end of the first switch unit 1, and a filter circuit is further disposed between the gate of the fourth MOS transistor Q4 and the gate of the fifth MOS transistor Q5 and the second output end of the first switch unit 1.
Specifically, the filtering circuit is mainly used for filtering the current in the second switch unit 3.
In one embodiment, and referring to fig. 3, the filter circuit includes a first capacitor C1, a sixth resistor, and a second capacitor C2 connected in series.
The foregoing description of the preferred embodiments of the present utility model is not intended to limit the scope of the utility model, but rather is intended to cover all modifications and variations within the scope of the present utility model as defined in the appended claims.
Claims (10)
1. A pre-discharge circuit for use in a solar controller, characterized by: the pre-discharge circuit comprises a first switch unit, a pre-discharge unit and a second switch unit, wherein the pre-discharge unit comprises a first resistor and a first MOS tube, the first resistor is connected with the first MOS tube in series, the input end of the first switch unit is connected with a discharge battery, the first output end of the first switch unit is connected with one end of the first resistor, the second output end of the first switch unit is connected with the input end of the second switch unit, and the output end of the second switch unit and the source electrode of the first MOS tube are connected with an external load.
2. The pre-discharge circuit of claim 1, wherein: the pre-discharge circuit further comprises a current sampling circuit, one end of the current sampling circuit is connected with the output end of the first switch unit, and the other end of the current sampling circuit is connected with the input end of the pre-discharge unit.
3. The pre-discharge circuit of claim 2, wherein: the current sampling circuit comprises a second resistor and a third resistor, the second resistor is connected with the third resistor in parallel, and sampling points are arranged at two ends of the third resistor.
4. The pre-discharge circuit of claim 1, wherein: the first switch unit comprises a plurality of MOS (metal oxide semiconductor) tubes, the sources of the MOS tubes are connected with the discharge battery, and the drains of the MOS tubes are connected with the input end of the pre-discharge unit.
5. The pre-discharge circuit of claim 4, wherein: the first switch unit comprises two MOS tubes, namely a second MOS tube and a third MOS tube, wherein the source electrode of the second MOS tube and the source electrode of the third MOS tube are connected with a discharge battery, the drain electrode of the second MOS tube and the drain electrode of the third MOS tube are connected to the input end of the pre-discharge unit, and the grid electrode of the second MOS tube is connected with the grid electrode of the third MOS tube.
6. The pre-discharge circuit of claim 5, wherein: a fourth resistor and a fifth resistor are further arranged between the grid electrode of the second MOS tube and the grid electrode of the third MOS tube, and the fourth resistor is connected in series with the fifth resistor.
7. The pre-discharge circuit of claim 1, wherein: the second switch unit comprises a plurality of MOS (metal oxide semiconductor) tubes, the sources of the MOS tubes are connected with a load, and the drains of the MOS tubes are connected with the second output end of the first switch unit.
8. The pre-discharge circuit of claim 7, wherein: the second switch unit comprises a fourth MOS tube and a fifth MOS tube, the drain electrode of the fourth MOS tube and the drain electrode of the fifth MOS tube are connected with the second output end of the first switch unit, the source electrode of the fourth MOS tube and the source electrode of the fifth MOS tube are connected with a load, and the grid electrode of the fourth MOS tube is connected with the grid electrode of the fifth MOS tube.
9. The pre-discharge circuit of claim 8, wherein: the grid electrode of the fourth MOS tube and the grid electrode of the fifth MOS tube are both connected to the second output end of the first switch unit, and a filter circuit is further arranged between the grid electrode of the fourth MOS tube and the second output end of the first switch unit and between the grid electrode of the fifth MOS tube and the second output end of the first switch unit.
10. The pre-discharge circuit of claim 9, wherein: the filter circuit comprises a first capacitor, a sixth resistor and a second capacitor which are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223423297.1U CN219107098U (en) | 2022-12-19 | 2022-12-19 | Pre-discharge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223423297.1U CN219107098U (en) | 2022-12-19 | 2022-12-19 | Pre-discharge circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219107098U true CN219107098U (en) | 2023-05-30 |
Family
ID=86455043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223423297.1U Active CN219107098U (en) | 2022-12-19 | 2022-12-19 | Pre-discharge circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219107098U (en) |
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2022
- 2022-12-19 CN CN202223423297.1U patent/CN219107098U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518000 Guangdong, Shenzhen, Baoan District, Baoan District City, the third floor of the community of 13A, Wutong Industrial Park, 4 layers and 5 stories. Patentee after: Shenzhen Shuorixin Energy Technology Co.,Ltd. Address before: 518000 Guangdong, Shenzhen, Baoan District, Baoan District City, the third floor of the community of 13A, Wutong Industrial Park, 4 layers and 5 stories. Patentee before: SHENZHEN SHUORI NEW ENERGY TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |