CN216598957U - Plant lighting short-circuit protection circuit and power supply - Google Patents
Plant lighting short-circuit protection circuit and power supply Download PDFInfo
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- CN216598957U CN216598957U CN202122744349.4U CN202122744349U CN216598957U CN 216598957 U CN216598957 U CN 216598957U CN 202122744349 U CN202122744349 U CN 202122744349U CN 216598957 U CN216598957 U CN 216598957U
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Abstract
The utility model discloses a plant lighting short-circuit protection circuit and a power supply, comprising a switch circuit, a detection circuit and a control circuit; wherein, the detection circuit comprises a first diode D1; the input end of the switch circuit is connected with the input end of the control circuit, the output end of the switch circuit is connected with the cathode of the first diode D1, the anode of the first diode D1 is connected with the feedback information input end of the control circuit, and the output end of the control circuit is connected with the control end of the switch circuit so as to control the on-off of the switch circuit. When the load has short-circuit fault, the diode in the detection circuit can quickly detect the fault and feed back the control circuit, the control circuit controls the turn-off of the switch circuit according to the feedback signal of the diode, and further the situation that the protected loop is influenced due to the short-circuit fault of the load is effectively avoided, the circuit structure is simple, and the protection effect is obvious.
Description
Technical Field
The utility model relates to the technical field of short-circuit protection, in particular to a plant lighting short-circuit protection circuit and a power supply.
Background
In the conventional technology, a power supply of a plant lighting lamp comprises a main power supply and two auxiliary power supplies arranged in the power supply, wherein one of the auxiliary power supplies power for a control circuit in the main power supply so as to realize the functions of standby and dimming turn-off of the main power supply. And the other path of the auxiliary power supply is output outwards and is used for supplying power to other low-power electric equipment outside the power supply, and when the low-power electric equipment has a power supply short-circuit fault, if the power supply of the low-power electric equipment cannot be cut off in time, the auxiliary power supply is damaged slightly, and the main power supply cannot work normally, so that unnecessary loss is caused. At present, the short-circuit protection circuit used for the external power supply of the auxiliary power supply in the market has the following defects: the circuit composition is relatively complex and the short-circuit response time is short.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the present invention is to provide a short-circuit protection circuit and power supply for plant lighting, aiming at least one of the defects in the prior art.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the plant lighting short-circuit protection circuit comprises a switch circuit, a detection circuit and a control circuit, wherein the switch circuit is used for controlling the input power supply to be switched on and switched off, the detection circuit is used for detecting whether the load is short-circuited, and the control circuit is used for controlling the on-off of the switch circuit according to feedback information of the detection circuit;
wherein the detection circuit comprises a first diode D1;
the input end of the switch circuit is connected with the input end of the control circuit, the output end of the switch circuit is connected with the cathode of the first diode D1, the anode of the first diode D1 is connected with the feedback information input end of the control circuit, and the output end of the control circuit is connected with the control end of the switch circuit so as to control the on-off of the switch circuit.
Preferably, in the plant lighting short-circuit protection circuit of the present invention, the switch circuit includes a first MOS transistor Q1 and a third resistor R3;
the source electrode of the first MOS transistor Q1 is the input end of the switch circuit, the drain electrode of the first MOS transistor Q1 is the output end of the switch circuit, and the grid electrode of the first MOS transistor Q1 is the control end of the switch circuit; the third resistor R3 is connected in parallel between the source and the gate of the first MOS transistor Q1.
Preferably, in the plant lighting short-circuit protection circuit of the present invention, the detection circuit further includes a fourth resistor R4; the fourth resistor R4 is connected in parallel between the input terminal and the output terminal of the switching circuit.
Preferably, in the plant lighting short-circuit protection circuit of the present invention, the control circuit includes a first resistor R1, a second resistor R2, and a voltage reference chip U1;
the input end of the switch circuit is connected with the first end of the first resistor R1, the second end of the first resistor R1 is connected with the first end of the second resistor R2, the anode of the first diode D1 and the reference voltage input end of the voltage reference chip U1, the reference voltage input end of the voltage reference chip U1 is the feedback information input end of the control circuit, the second end of the second resistor R2 is connected with the anode of the voltage reference chip U1, and the cathode of the voltage reference chip U1 is the output end of the control circuit.
Preferably, in the plant lighting short-circuit protection circuit of the present invention, the control circuit further includes a first capacitor C1, and the first capacitor C1 is connected in parallel to two ends of the second resistor R2.
Preferably, in the plant lighting short-circuit protection circuit of the present invention, the control circuit includes a first resistor R1, a second resistor R2, and a second MOS transistor Q2;
the input end of the switch circuit is connected with the first end of the first resistor R1, the second end of the first resistor R1 is connected with the first end of the second resistor R2, the anode of the first diode D1 and the gate of the second MOS tube Q2, the second end of the second resistor R2 is connected with the source of the second MOS tube Q2, and the drain of the second MOS tube Q2 is the output end of the control circuit.
Preferably, in the plant lighting short-circuit protection circuit of the present invention, the control circuit further includes a second zener diode D2; the cathode of the second zener diode D2 is connected to the anode of the first diode D1, and the anode of the second zener diode D2 is connected to the gate of the second MOS transistor Q2.
The utility model also constructs a plant lighting power supply, which comprises a main power supply used for supplying power to the plant lighting lamp, an auxiliary power supply and any one of the plant lighting short-circuit protection circuits;
the auxiliary power supply comprises two paths of output voltages, one path is connected with a power input end of a control circuit in the main power supply, and the other path is connected with peripheral electric equipment through the plant lighting short-circuit protection circuit.
The implementation of the utility model has the following beneficial effects: when short-circuit fault occurs to the load, the diode in the detection circuit can quickly detect the fault occurrence and feed back the control circuit, the control circuit controls the turn-off of the switch circuit according to the feedback signal of the diode, and further the situation that the protected loop is influenced due to the short-circuit fault of the load is effectively avoided.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a logic diagram of a first embodiment of a plant lighting short circuit protection circuit of the present invention;
FIG. 2 is a circuit diagram of a first embodiment of a plant lighting short circuit protection circuit of the present invention;
FIG. 3 is a circuit diagram of a second embodiment of a plant lighting short circuit protection circuit of the present invention;
FIG. 4 is a circuit diagram of a third embodiment of a plant lighting short circuit protection circuit of the present invention;
fig. 5 is a schematic diagram of the logic of a plant lighting power supply of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the plant lighting short-circuit protection circuit includes a switch circuit for controlling the on/off of the input power, a detection circuit for detecting whether the load is short-circuited, and a control circuit for controlling the on/off of the switch circuit according to the feedback information of the detection circuit; the input end of the switch circuit is connected with the input end of the control circuit, the output end of the switch circuit is connected with the input end of the detection circuit, the output end of the detection circuit is connected with the feedback information input end of the control circuit, and the output end of the control circuit is connected with the control end of the switch circuit so as to control the on-off of the switch circuit.
As shown in fig. 2, the switch circuit includes a first MOS transistor Q1 and a third resistor R3, the control circuit includes a first resistor R1, a second resistor R2 and a voltage reference chip U1, and the detection circuit includes a first diode D1.
Specifically, the third resistor R3 is connected in parallel between the source and the gate of the first MOS transistor Q1, the source of the first MOS transistor Q1 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the anode of the first diode D1 and the reference voltage input end of the voltage reference chip U1, the cathode of the voltage reference chip U1 is connected to the gate of the first MOS transistor Q1, the drain of the first MOS transistor Q1 is connected to the cathode of the first diode D1, and the second end of the second resistor R2 is connected to the anode of the voltage reference chip U1;
the source of the first MOS transistor Q1 is the input end of the switch circuit, the drain of the first MOS transistor Q1 is the output end of the switch circuit, and the gate of the first MOS transistor Q1 is the control end of the switch circuit; a reference voltage input end of the voltage reference chip U1 is a feedback information input end of the control circuit, and a cathode of the voltage reference chip U1 is an output end of the control circuit; the cathode of the first diode D1 is the input terminal of the detection circuit, and the anode of the first diode D1 is the output terminal of the detection circuit.
In some embodiments, the voltage reference chip U1 is model AZ432, which has the following characteristics: when the voltage of the reference voltage input end is less than the internal reference voltage, the cathode and the anode are cut off in reverse direction; conversely, the cathode and anode are in reverse conduction. This is prior art and is not overly described herein.
When the load is in a normal working state, under the partial pressure action of the first resistor R1 and the second resistor R2, the voltage of the reference voltage input end of the voltage reference chip U1 is greater than the internal reference voltage thereof, and the cathode and the anode of the voltage reference chip U1 are conducted in reverse directions, so that the source and the drain of the first MOS transistor Q1 are conducted, and the protected circuit is connected with the load; when the load has short-circuit fault, the first diode D1 is turned on, so that the voltage at the reference voltage input end of the voltage reference chip U1 is quickly pulled down and is smaller than the internal reference voltage thereof, at this time, the cathode and the anode of the voltage reference chip U1 are reversely cut off, and the source and the drain of the first MOS transistor Q1 are cut off, thereby cutting off the connection between the protected circuit and the load, and further preventing the short-circuit fault of the load from affecting the protected circuit.
As shown in fig. 2, the detection circuit further includes a fourth resistor R4, and the fourth resistor R4 is connected in parallel between the input terminal and the output terminal of the switch circuit. When the load is restored from the short-circuit state to the normal state, the cathode voltage of the first diode D1 is increased at a speed determined by the size of the equivalent capacitance of the load, and the increase of the fourth resistor R4 can quickly pull up the cathode voltage of the first diode D1, thereby quickly restoring to the connection state.
As shown in fig. 2, the control circuit further includes a first capacitor C1, and the first capacitor C1 is connected in parallel to two ends of the second resistor R2. The first capacitor C1 is used to filter out interference signals entering the reference voltage input of the voltage reference chip U1.
Fig. 3 is a circuit diagram of a second embodiment of a plant lighting short circuit protection circuit of the present invention. As shown in fig. 3, the second embodiment is based on the first embodiment, and a second MOS transistor Q2 is substituted for the voltage reference chip U1 in the first embodiment.
Specifically, the input end of the switch circuit is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the anode of the first diode D1 and the gate of the second MOS transistor Q2, the gate of the second MOS transistor Q2 is the feedback information input end of the control circuit, the second end of the second resistor R2 is connected to the source of the second MOS transistor Q2, and the drain of the second MOS transistor Q2 is the output end of the control circuit.
When the load is in a normal working state, under the partial pressure action of the first resistor R1 and the second resistor R2, the gate of the second MOS transistor Q2 is at a high level, and the drain and the source of the second MOS transistor Q2 are conducted, so that the source and the drain of the first MOS transistor Q1 are conducted, and the protected circuit is connected with the load; when the load has short-circuit fault, the first diode D1 is turned on, so that the gate voltage of the second MOS transistor Q2 is pulled low, the drain and the source of the second MOS transistor Q2 are cut off, and the source and the drain of the first MOS transistor Q1 are cut off, thereby cutting off the connection between the protected circuit and the load.
Fig. 4 is a circuit diagram of a third embodiment of a plant lighting short circuit protection circuit of the present invention. As shown in fig. 4, the third embodiment is based on the second embodiment, and a second zener diode is added between the first diode D1 and the gate of the second MOS transistor Q2.
Specifically, the cathode of the second zener diode D2 is connected to the anode of the first diode D1, and the anode of the second zener diode D2 is connected to the gate of the second MOS transistor Q2.
Since the turn-on voltage of the first diode D1 is 0.2-0.7V, if it is directly connected to the gate of the second MOS transistor Q2, there is a turn-on risk. Therefore, the addition of the second zener diode D2 can play a clamping role to ensure that the drain and source of the second MOS transistor Q2 are turned off in the event of a load short fault.
As shown in fig. 5, the utility model also constructs a plant lighting power supply, which comprises a main power supply for supplying power to a plant lighting lamp, an auxiliary power supply and any one of the plant lighting short-circuit protection circuits;
the auxiliary power supply comprises two paths of output voltages, one path is connected with the power supply input end of the control circuit in the main power supply, and the other path can be connected with peripheral electric equipment through the plant lighting short-circuit protection circuit.
In some embodiments, the auxiliary power supply supplies power to a control circuit in the main power supply, wherein the control circuit is used for realizing functions of dimming, turning off, standby and the like of the power supply. In addition, the auxiliary power supply is also provided with a power supply for supplying power to peripheral electric equipment. When the peripheral electric equipment has a short-circuit fault, the plant lighting short-circuit protection circuit can quickly cut off the power supply line of the auxiliary power supply to the electric equipment, so that the fault of the auxiliary power supply is avoided, and further, the fault of a main power supply is avoided, and further, the greater loss is avoided. The electric device may be a dimmer or a controller or a radiator, etc.
The implementation of the utility model has the following beneficial effects: when short-circuit fault occurs to the load, the diode in the detection circuit can quickly detect the fault occurrence and feed back the control circuit, the control circuit controls the turn-off of the switch circuit according to the feedback signal of the diode, and further the situation that the protected loop is influenced due to the short-circuit fault of the load is effectively avoided.
It should be understood that the above examples only represent the preferred embodiments of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (8)
1. A short-circuit protection circuit for plant illumination is characterized by comprising a switch circuit for controlling the on-off of an input power supply, a detection circuit for detecting whether a load is short-circuited, and a control circuit for controlling the on-off of the switch circuit according to feedback information of the detection circuit;
wherein the detection circuit comprises a first diode D1;
the input end of the switch circuit is connected with the input end of the control circuit, the output end of the switch circuit is connected with the cathode of the first diode D1, the anode of the first diode D1 is connected with the feedback information input end of the control circuit, and the output end of the control circuit is connected with the control end of the switch circuit so as to control the on-off of the switch circuit.
2. The plant lighting short-circuit protection circuit according to claim 1, wherein the switch circuit comprises a first MOS transistor Q1 and a third resistor R3;
the source electrode of the first MOS transistor Q1 is the input end of the switch circuit, the drain electrode of the first MOS transistor Q1 is the output end of the switch circuit, and the grid electrode of the first MOS transistor Q1 is the control end of the switch circuit; the third resistor R3 is connected in parallel between the source and the gate of the first MOS transistor Q1.
3. The plant lighting short-circuit protection circuit of claim 1, wherein the detection circuit comprises a fourth resistor R4; the fourth resistor R4 is connected in parallel between the input terminal and the output terminal of the switching circuit.
4. The plant lighting short-circuit protection circuit according to any one of claims 1 to 3, wherein the control circuit comprises a first resistor R1, a second resistor R2 and a voltage reference chip U1;
the input end of the switch circuit is connected with the first end of the first resistor R1, the second end of the first resistor R1 is connected with the first end of the second resistor R2, the anode of the first diode D1 and the reference voltage input end of the voltage reference chip U1, the reference voltage input end of the voltage reference chip U1 is the feedback information input end of the control circuit, the second end of the second resistor R2 is connected with the anode of the voltage reference chip U1, and the cathode of the voltage reference chip U1 is the output end of the control circuit.
5. The plant lighting short-circuit protection circuit according to claim 4, wherein the control circuit further comprises a first capacitor C1, and the first capacitor C1 is connected in parallel across the second resistor R2.
6. The plant lighting short-circuit protection circuit according to any one of claims 1 to 3, wherein the control circuit comprises a first resistor R1, a second resistor R2 and a second MOS transistor Q2;
the input end of the switch circuit is connected with the first end of the first resistor R1, the second end of the first resistor R1 is connected with the first end of the second resistor R2, the anode of the first diode D1 and the gate of the second MOS tube Q2, the second end of the second resistor R2 is connected with the source of the second MOS tube Q2, and the drain of the second MOS tube Q2 is the output end of the control circuit.
7. The plant lighting short-circuit protection circuit according to claim 6, wherein the control circuit further comprises a second zener diode D2; the cathode of the second zener diode D2 is connected to the anode of the first diode D1, and the anode of the second zener diode D2 is connected to the gate of the second MOS transistor Q2.
8. A plant lighting power supply comprising a main power supply for supplying power to a plant lighting lamp, an auxiliary power supply, and the plant lighting short circuit protection circuit of any one of claims 1 to 7;
the auxiliary power supply comprises two paths of output voltages, one path is connected with a power input end of a control circuit in the main power supply, and the other path is connected with peripheral electric equipment through the plant lighting short-circuit protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122744349.4U CN216598957U (en) | 2021-11-10 | 2021-11-10 | Plant lighting short-circuit protection circuit and power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122744349.4U CN216598957U (en) | 2021-11-10 | 2021-11-10 | Plant lighting short-circuit protection circuit and power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216598957U true CN216598957U (en) | 2022-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122744349.4U Active CN216598957U (en) | 2021-11-10 | 2021-11-10 | Plant lighting short-circuit protection circuit and power supply |
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| Country | Link |
|---|---|
| CN (1) | CN216598957U (en) |
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2021
- 2021-11-10 CN CN202122744349.4U patent/CN216598957U/en active Active
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