CN221353902U - Positive and negative two-way power supply mutual control protection circuit - Google Patents
Positive and negative two-way power supply mutual control protection circuit Download PDFInfo
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- CN221353902U CN221353902U CN202323237034.6U CN202323237034U CN221353902U CN 221353902 U CN221353902 U CN 221353902U CN 202323237034 U CN202323237034 U CN 202323237034U CN 221353902 U CN221353902 U CN 221353902U
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Abstract
The utility model discloses a positive and negative power supply mutual control protection circuit, which belongs to the technical field of power supply protection, and comprises a positive power supply input end, a positive power supply switch circuit, a positive power supply secondary input end, a positive power supply output switch control circuit, a positive power supply output end which are sequentially connected, and a negative power supply input end, a negative power supply control switch circuit and a negative power supply output end which are sequentially connected; the secondary input end of the positive power supply is also connected with a negative power supply control switch circuit; the negative power supply output end is also connected with a positive power supply output switch control circuit. The scheme of the utility model has simple structure and unique design, the positive power supply and the negative power supply are synchronously started, and become the respective normal running conditions, so that the positive power supply and the negative power supply in the circuit can work normally at the same time, and when one power supply has the power failure condition, the output of the other power supply can be automatically disconnected in time, thereby playing the roles of mutually controlling the positive power supply and the negative power supply and protecting electronic devices, and improving the stability of electronic products.
Description
Technical Field
The utility model relates to the technical field of power supply protection, in particular to a positive and negative power supply mutual control protection circuit.
Background
In many electronic devices or electronic terminal products, there are positive and negative power supplies to provide normal operation for the internal circuit devices, but the positive and negative power supplies are mutually independent, when one power supply fails to power off due to artificial or short circuit, the other power supply can work and output normally, which easily causes damage to the electronic devices or aggravation of equipment failure.
Disclosure of utility model
The utility model provides a mutual control protection circuit for positive and negative power supplies, which aims to solve the problem of aggravation of device or equipment faults caused by normal operation of one power supply of the positive and negative power supplies when the other power supply fails.
The technical scheme adopted by the utility model is as follows:
The utility model provides a positive and negative power supply mutual control protection circuit, which comprises a positive power supply input end, a positive power supply switch circuit, a positive power supply secondary input end, a positive power supply output switch control circuit, a positive power supply output end, a negative power supply input end, a negative power supply control switch circuit and a negative power supply output end which are connected in sequence; the positive power supply secondary input end is also connected with the negative power supply control switch circuit; the negative power supply output end is also connected with the positive power supply output switch control circuit; and the positive power supply output end and the negative power supply output end are connected with electric equipment.
The scheme of the utility model has simple structure and unique design, the secondary input end of the positive power supply is connected with the negative power supply control switch circuit, the output end of the negative power supply is connected with the positive power supply output switch control circuit, the positive power supply and the negative power supply are synchronously started and become the respective normal running condition, the positive power supply and the negative power supply in the circuit can be ensured to work normally at the same time, when one power supply is in the power failure condition, the output of the other power supply can be automatically disconnected in time, the functions of mutually controlling the positive power supply and the negative power supply and protecting electronic devices are achieved, and the stability of electronic products is improved.
Drawings
Fig. 1 is a block diagram of a circuit connection relationship according to an embodiment of the present utility model.
Fig. 2 is a schematic circuit diagram according to an embodiment of the present utility model.
Detailed Description
The technical scheme of the utility model is further described below with reference to the attached drawings.
The utility model is used for electronic equipment or electronic terminal products with positive and negative low-voltage direct-current power supplies.
Referring to fig. 1, fig. 1 is a block diagram of a circuit connection relationship according to an embodiment of the present utility model.
As shown in fig. 1, the utility model provides a positive and negative power supply mutual control protection circuit, which comprises a positive power supply input end 1, a positive power supply switch circuit 2, a positive power supply secondary input end 3, a positive power supply output switch control circuit 4, a positive power supply output end 5, a negative power supply input end 6, a negative power supply control switch circuit 7 and a negative power supply output end 8 which are connected in sequence; the positive power supply secondary input terminal 3 is also connected with the negative power supply control switch circuit 7; the negative power supply output end 8 is also connected with the positive power supply output switch control circuit 4; the positive power supply output end 5 and the negative power supply output end 8 are both connected with electric equipment.
Referring to fig. 2, fig. 2 is a schematic circuit diagram according to an embodiment of the utility model. In the embodiment of the utility model, as shown in FIG. 2, the positive power input terminal 1 is vin+, the positive power secondary input terminal 3 is Vcc, the positive power output terminal 5 is Vout+, the negative power input terminal 6 is Vin-, and the negative power output terminal 8 is Vout-.
The positive power switch circuit 2 comprises a key switch K1, a first resistor R2 and a first power switch tube Q1; one end of the key switch K1 is grounded, the other end of the key switch K1 is connected with the positive power input end 1 through the first resistor R2, the grid electrode of the first power switch tube Q1 is grounded through the key switch K1, the source electrode of the first power switch tube Q1 is connected with the positive power input end 1, and the drain electrode of the first power switch tube Q1 is connected with the positive power secondary input end 3.
The positive power supply output switch control circuit 4 comprises a second resistor R3, a third resistor R4, a second power switch tube Q2 and a first optical coupler U1; one end of the second resistor R3 is connected with the positive power supply secondary input end 3, the other end of the second resistor R3 is respectively connected with the grid electrode of the second power switch tube Q2 and the collector electrode of the first optical coupler U1, the source electrode of the second power switch tube Q2 is connected with the positive power supply secondary input end 3, and the drain electrode is connected with the positive power supply output end 5; the emitter of the first optical coupler U1 is grounded, the anode is grounded through a third resistor R4, and the cathode is connected with the negative power supply output end 8.
The negative power supply control switch circuit 7 comprises a fourth resistor R6, a fifth resistor R7, a sixth resistor R8, a third power switch tube Q3 and a second optical coupler U2; one end of the fourth resistor R6 is connected with the negative power supply input end 6, and the other end of the fourth resistor R6 is connected with the emitter of the second optical coupler U2; the source electrode of the third power switch tube Q3 is connected with the negative power supply input end 6, the grid electrode is connected with the emitter electrode of the second optical coupler U2, and the drain electrode is connected with the negative power supply output end 8; the collector of the second optocoupler U2 is connected with the positive power supply secondary input end 3 through a fifth resistor R7, the anode is connected with the positive power supply secondary input end 3 through a sixth resistor R8, and the cathode is grounded.
The circuit process and principle of the embodiment of the utility model are as follows:
(1) Positive and negative power supplies are respectively connected to the positive power supply input terminal Vin+ and the negative power supply input terminal Vin-, and at this time, the positive power supply secondary Vcc, the positive power supply output terminal Vout+ and the negative power supply output terminal Vout-are about 0V.
(2) The key switch K1 is closed, the first power switch tube Q1 is conducted, and the secondary Vcc voltage of the positive power supply is equal to vin+. Under the condition that the positive power supply secondary Vcc is electrified, the positive power supply secondary Vcc drives the second optocoupler U2 to work through a sixth resistor R8, a high level is applied to the grid electrode of the third power switch tube Q3 through a fifth resistor R7, the third power switch tube Q3 is conducted, and the negative power supply output end Vout-outputs a negative power supply to supply power to a load.
(3) The negative power supply output end Vout-drives the first optocoupler U1 to work through the third resistor R4, the grid electrode of the second power switch tube Q2 is at a low level, the second power switch tube Q2 is conducted, and the positive power supply output end Vout+ outputs a positive power supply to supply power to a load.
(4) When the short circuit fault occurs on the positive power supply load circuit to cause power failure, undervoltage or artificial power failure, the voltage of the positive power supply secondary Vcc is pulled down, the second optocoupler U2 and the third power switch tube Q3 stop working, and the output of the negative power supply end Vout-is disconnected; meanwhile, as the negative power supply output end Vout-is disconnected, the first optical coupler U1 and the second power switch tube Q2 also stop working, and the positive power supply output is disconnected. And after the fault is eliminated, the positive power supply secondary Vcc is recovered to be normal, the switching tubes are turned on again, and the circuit is recovered to be normal.
(5) Similarly, when the negative power supply load circuit has short circuit fault to cause power failure, under-voltage or artificial power failure, the positive power supply output can be closed, so as to achieve the function of mutual control protection.
The first power switch tube Q1 and the second power switch tube Q2 are P-MOS tubes, the third power switch tube Q3 is an N-MOS tube, and the selection principles of the first power switch tube Q1, the second power switch tube Q2 and the third power switch tube Q3 are as follows: the rated current is 2-3 times of the rated current of the actual circuit, and the rated voltage is not less than the actual working voltage. In the embodiment of the utility model, the resistance values of the first resistor R2, the second resistor R3, the fourth resistor R6 and the fifth resistor R7 are 470kΩ, the resistance value range of the third resistor R4 and the sixth resistor R8 is 4.7kΩ -10kΩ, and the first optical coupler U1 and the second optical coupler U2 are common optical coupler devices.
The scheme of the utility model has simple structure and unique design, the secondary input end of the positive power supply is connected with the negative power supply control switch circuit, the output end of the negative power supply is connected with the positive power supply output switch control circuit, the positive power supply and the negative power supply are synchronously started and become the respective normal running condition, the positive power supply and the negative power supply in the circuit can be ensured to work normally at the same time, when one power supply is in the power failure condition, the output of the other power supply can be automatically disconnected in time, the functions of mutually controlling the positive power supply and the negative power supply and protecting electronic devices are achieved, and the stability of electronic products is improved.
It should be noted that the above list is only one specific embodiment of the present utility model. It is obvious that the utility model is not limited to the above embodiments, but that many variations are possible, and that in any case all variations that can be directly derived or suggested by a person skilled in the art from the disclosure of the utility model shall be considered as the protective scope of the utility model.
Claims (7)
1. A positive and negative power supply mutual control protection circuit is characterized by comprising: the positive power supply control circuit comprises a positive power supply input end (1), a positive power supply switch circuit (2), a positive power supply secondary input end (3), a positive power supply output switch control circuit (4), a positive power supply output end (5) which are connected in sequence, and a negative power supply input end (6), a negative power supply control switch circuit (7) and a negative power supply output end (8) which are connected in sequence; the positive power supply secondary input end (3) is also connected with the negative power supply control switch circuit (7); the negative power supply output end (8) is also connected with the positive power supply output switch control circuit (4); the positive power supply output end (5) and the negative power supply output end (8) are connected with electric equipment.
2. The positive and negative power supply mutual control protection circuit according to claim 1, wherein the positive power supply switching circuit (2) comprises a key switch (K1), a first resistor (R2) and a first power switch tube (Q1); one end of the key switch (K1) is grounded, the other end of the key switch is connected with the positive power input end (1) through the first resistor (R2), the grid electrode of the first power switch tube (Q1) is grounded through the key switch (K1), the source electrode of the first power switch tube is connected with the positive power input end (1), and the drain electrode of the first power switch tube is connected with the positive power secondary input end (3).
3. The positive and negative power supply mutual control protection circuit according to claim 1, wherein the positive power supply output switch control circuit (4) comprises a second resistor (R3), a third resistor (R4), a second power switch tube (Q2) and a first optical coupler (U1); one end of the second resistor (R3) is connected with the positive power supply secondary input end (3), the other end of the second resistor is respectively connected with the grid electrode of the second power switch tube (Q2) and the collector electrode of the first optical coupler (U1), the source electrode of the second power switch tube (Q2) is connected with the positive power supply secondary input end (3), and the drain electrode of the second resistor is connected with the positive power supply output end (5); the emitter of the first optical coupler (U1) is grounded, the anode is grounded through a third resistor (R4), and the cathode is connected with the negative power supply output end (8).
4. The positive and negative power supply mutual control protection circuit according to claim 1, wherein the negative power supply control switching circuit (7) comprises a fourth resistor (R6), a fifth resistor (R7), a sixth resistor (R8), a third power switching tube (Q3) and a second optical coupler (U2); one end of the fourth resistor (R6) is connected with the negative power supply input end (6), and the other end of the fourth resistor is connected with the emitter of the second optical coupler (U2); the source electrode of the third power switch tube (Q3) is connected with the negative power supply input end (6), the grid electrode is connected with the emitter electrode of the second optical coupler (U2), and the drain electrode is connected with the negative power supply output end (8); the collector of the second optical coupler (U2) is connected with the positive power supply secondary input end (3) through a fifth resistor (R7), the anode is connected with the positive power supply secondary input end (3) through a sixth resistor (R8), and the cathode is grounded.
5. The positive and negative power supply mutual control protection circuit according to claim 2, wherein the first power switch tube (Q1) is a P-MOS tube.
6. A positive and negative power supply mutual control protection circuit according to claim 3, characterized in that the second power switch tube (Q2) is a P-MOS tube.
7. The positive and negative power supply mutual control protection circuit according to claim 4, wherein the third power switch tube (Q3) is an N-MOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323237034.6U CN221353902U (en) | 2023-11-29 | 2023-11-29 | Positive and negative two-way power supply mutual control protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323237034.6U CN221353902U (en) | 2023-11-29 | 2023-11-29 | Positive and negative two-way power supply mutual control protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN221353902U true CN221353902U (en) | 2024-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323237034.6U Active CN221353902U (en) | 2023-11-29 | 2023-11-29 | Positive and negative two-way power supply mutual control protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221353902U (en) |
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2023
- 2023-11-29 CN CN202323237034.6U patent/CN221353902U/en active Active
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