CN217362886U - External current-sharing circuit of module power supply - Google Patents
External current-sharing circuit of module power supply Download PDFInfo
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- CN217362886U CN217362886U CN202221053932.9U CN202221053932U CN217362886U CN 217362886 U CN217362886 U CN 217362886U CN 202221053932 U CN202221053932 U CN 202221053932U CN 217362886 U CN217362886 U CN 217362886U
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- sharing circuit
- operational amplifier
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Abstract
The utility model discloses an external current-sharing circuit of a module power supply, which comprises a first module power supply, a second module power supply and a current-sharing circuit, wherein the current-sharing circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an MOS (metal oxide semiconductor) tube and an operational amplifier; the positive output end of the first module power supply is connected with the positive output end of the second module power supply, the negative output end of the first module power supply is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the second resistor, one end of the seventh resistor, one end of the fourth resistor and the source electrode of the MOS tube, and the negative output end of the second module power supply is connected with the other end of the seventh resistor. The utility model discloses simple structure, it is with low costs, need not to change module power supply internal circuit, through the setting of peripheral circuit, can make things convenient for, the parallelly connected effect of flow equalizing of economic completion module power for the extension of power is used more in a flexible way.
Description
Technical Field
The utility model relates to a module power supply circuit technical field specifically is an external circuit that flow equalizes of module power.
Background
In the current application occasions of the switching power supply, when the output current of the single-module power supply cannot meet the use requirement, the power needs to be expanded by adopting a method of parallel current sharing of a plurality of modules of power supplies, so that the current sharing function of the power supply is required to be built in. The power supply module without the current sharing function can not realize the current sharing function, the use is limited, and the process requirement on the built-in current sharing function of the power supply is higher at present, so that the cost is high and the price is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an external circuit that flow equalizes of module power, simple structure, it is with low costs, need not to change the module power internal circuit, through the setting of peripheral circuit, can make things convenient for, the parallelly connected effect of flow equalizing of economic completion module power for the extension of power is used more in a flexible way.
In order to achieve the above object, the utility model provides a following technical scheme: an external current-sharing circuit of a module power supply comprises a first module power supply, a second module power supply and a current-sharing circuit, wherein the current-sharing circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an MOS (metal oxide semiconductor) tube and an operational amplifier; the positive input end of the first module power supply is connected with the positive input end of the second module power supply, the negative input end of the first module power supply is connected with the negative input end of the second module power supply, the positive output end of the first module power supply is connected with the positive output end of the second module power supply, the negative output end of the first module power supply is connected with one end of a first resistor, the other end of the first resistor is connected with one end of a second resistor, one end of a seventh resistor, one end of a fourth resistor and the source electrode of an MOS (metal oxide semiconductor) transistor, the negative output end of the second module power supply is connected with the other end of the seventh resistor, the other end of the second resistor is connected with the inverting input end of an operational amplifier, the other end of the fourth resistor is connected with one end of a third resistor and the non-inverting input end of the operational amplifier, and the output end of the operational amplifier is connected with the other end of the third resistor and one end of the sixth resistor, the other end of the sixth resistor is connected with the grid electrode of the MOS tube, the drain electrode of the MOS tube is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with the voltage adjusting end of the second module power supply.
Preferably, the positive power supply terminal of the operational amplifier is connected with the positive output terminal of the first module power supply.
Preferably, the negative power supply terminal of the operational amplifier is grounded.
Preferably, the positive power supply terminal of the operational amplifier is further connected to one end of a capacitor.
Preferably, the other end of the capacitor is grounded.
Preferably, the negative output end of the first module power supply is also grounded.
Preferably, the negative output end of the second module power supply is also grounded.
Preferably, the first resistor is a sampling resistor.
Preferably, the seventh resistor is a sampling resistor.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model has the advantages of simple structure, each components and parts are with low costs, greatly reduced the cost, and the circuit that just flow equalizes is external circuit, can be connected with the module power that does not possess the function of flow equalizing at will, makes it possess the function of flow equalizing to improve its range of application.
2. The utility model discloses an external current-sharing circuit of module power adopts the connected mode of contact pin socket for it is very convenient that current-sharing circuit and module power collocation are changed.
3. The utility model discloses a voltage of sampling resistor collection module power to through the structure of operational amplifier with the MOS pipe, make arbitrary module mains voltage too high or cross the function of flow equalizing when low all can realize.
4. The utility model discloses a need not to change module power internal circuit, through the setting of peripheral circuit, can make things convenient for, the parallelly connected effect of flow equalizing of economic completion module power for the extension of power is used more in a flexible way.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention;
in the figure, U1, the first module power supply; u2 and a second module power supply; r1, a first resistor; r2, a second resistor; r3, third resistance; r4, fourth resistor; r5, fifth resistor; r6, sixth resistor; r7, seventh resistor; c1, capacitance; u11, operational amplifier; q1 and MOS tube.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
As shown in fig. 1, the utility model provides an external current-sharing circuit of module power supply, including first module power supply U1, second module power supply U2, the circuit that flow equalizes includes first resistance R1, second resistance R2, third resistance R3, fourth resistance R4, fifth resistance R5, sixth resistance R6, seventh resistance R7, MOS pipe Q1, operational amplifier U11; the positive input end of a first module power supply U1 is connected with the positive input end of a second module power supply U2, the negative input end of the first module power supply U1 is connected with the negative input end of the second module power supply U2, the positive output end of the first module power supply U1 is connected with the positive output end of the second module power supply U2, the negative output end of the first module power supply U1 is connected with one end of a first resistor R1, the other end of the first resistor R1 is connected with one end of a second resistor R2, one end of a seventh resistor R7, one end of a fourth resistor R4, the source of a MOS transistor Q1, the negative output end of the second module power supply U2 is connected with the other end of a seventh resistor R7, the other end of the second resistor R2 is connected with the inverting input end of an operational amplifier U11, the other end of the fourth resistor R4 is connected with one end of a third resistor R3, the non-inverting input end of the operational amplifier U11, the output end of an operational amplifier U11 is connected with the inverting input end of a third resistor R3, and the other end of the operational amplifier U11, One end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the gate of the MOS transistor Q1, the drain of the MOS transistor Q1 is connected to one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to the voltage regulation end of the second module power supply U2, the first resistor R1 is a sampling resistor, and the seventh resistor R7 is a sampling resistor.
In another embodiment of the present invention, in order to provide power to the operational amplifier U11, the positive power terminal of the operational amplifier U11 is connected to the positive output terminal of the first module power U1; the negative power supply terminal of the operational amplifier U11 is grounded.
The utility model discloses a in another embodiment, in order to protect operational amplifier U11, improve operational amplifier U11's life, operational amplifier U11's power positive terminal still connects capacitor C1's one end, capacitor C1's other end ground connection.
In another embodiment of the present invention, in order to improve the safety of the whole circuit, the negative output terminal of the first module power supply U1 is also grounded; the negative output of the second module power supply U2 is also connected to ground.
First module power U1 and second module power U2 are two same output voltage's power module, do not own have the function of parallelly connected flow equalizing, through external the utility model discloses a circuit that flow equalizes then can need not to carry out any change to the module and can realize flow equalizing.
The basic condition for realizing the current sharing of the power supply is that the output voltage values of the load ends are completely consistent, so that the output current can be equally divided, when the output voltage of one power supply module is high, the output current is completely born by the power supply, the output current of the other power supply module is almost 0, the current sharing cannot be realized, and the output power cannot be expanded.
When a resistor is connected between the voltage regulating end (Trim end) of the module power supply and the negative output end (Vout-end) of the module power supply, the output voltage of the module power supply is reduced, and the lower the resistance value of the resistor connected between the Trim end and the Vout-end, the lower the output voltage is correspondingly.
Based on this, the utility model discloses the theory of operation as follows:
in the circuit, a first resistor R1 and a seventh resistor R7 (the first resistor R1 and the seventh resistor R7 are sampling resistors) respectively sample output currents of two power supplies, a sampling voltage sampled by the first resistor R1 enters an inverting input end of an operational amplifier U1, and a sampling voltage sampled by the seventh resistor R7 enters a same-direction input end of the operational amplifier U1.
If the output voltage of the first module power source U1 is higher than the output voltage of the second module power source U2, the output current of the first module power source U1 is higher than the output current of the second module power source U2, and at this time, the sampling voltage of the first resistor R1 is higher than the sampling voltage of the seventh resistor R7, the output level of the operational amplifier U11 is lowered, the conduction level of the MOS transistor Q1 is lowered, the inter-drain-source resistance of the MOS transistor Q1 is raised, the impedance between the voltage regulation terminal (Trim terminal) and the negative output terminal (Vout-terminal) of the second module power source U2 is raised accordingly, and at this time, the output voltage of the second module power source U2 is raised, the output current is raised accordingly, and the currents are balanced again.
If the output voltage of the second module power source U2 is higher than the output voltage of the first module power source U1, the output current of the second module power source U2 is higher than the output current of the first module power source U1, and at this time, the sampling voltage of the seventh resistor R7 is higher than the sampling voltage of the first resistor R1, the output level of the operational amplifier U11 is lowered, the turn-on level of the MOS transistor Q1 is raised, the inter-drain-source resistance of the MOS transistor Q1 is lowered, the impedance between the voltage regulation terminal (Trim terminal) and the negative output terminal (Vout-terminal) of the second module power source U2 is lowered accordingly, and at this time, the output voltage of the second module power source U2 is lowered, the output current is lowered accordingly, and the currents are balanced again.
The utility model discloses need not to change module power supply internal circuit, through the setting of peripheral circuit, can make things convenient for, the parallelly connected effect of flow equalizing of economic completion module power for the extension of power is used more in a flexible way.
In the description of the present invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. An external current sharing circuit of a module power supply comprises a first module power supply (U1), and is characterized in that: the current-sharing circuit comprises a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), a MOS (Q1) and an operational amplifier (U11); the positive input end of the first module power supply (U1) is connected with the positive input end of a second module power supply (U2), the negative input end of the first module power supply (U1) is connected with the negative input end of a second module power supply (U2), the positive output end of the first module power supply (U1) is connected with the positive output end of the second module power supply (U2), the negative output end of the first module power supply (U1) is connected with one end of a first resistor (R1), the other end of the first resistor (R1) is connected with one end of a second resistor (R2), one end of a seventh resistor (R7), one end of a fourth resistor (R4) and the source of a MOS (Q1), the negative output end of the second module power supply (U2) is connected with the other end of the seventh resistor (R7), the other end of the second resistor (R2) is connected with the inverting input end of another operational amplifier (U11), and the other end of the fourth resistor (R4) is connected with the other end of the inverting input end of the third resistor (R685 3), The non-inverting input end of the operational amplifier (U11), the output end of the operational amplifier (U11) is connected with the other end of the third resistor (R3) and one end of the sixth resistor (R6), the other end of the sixth resistor (R6) is connected with the grid electrode of the MOS tube (Q1), the drain electrode of the MOS tube (Q1) is connected with one end of the fifth resistor (R5), and the other end of the fifth resistor (R5) is connected with the voltage adjusting end of the second module power supply (U2).
2. The external current sharing circuit of a modular power supply of claim 1, wherein: and the positive power supply end of the operational amplifier (U11) is connected with the positive output end of the first module power supply (U1).
3. The external current sharing circuit of the module power supply of claim 1 or 2, wherein: the negative power supply terminal of the operational amplifier (U11) is grounded.
4. The external current sharing circuit of a modular power supply of claim 2, wherein: the positive power supply terminal of the operational amplifier (U11) is also connected with one end of a capacitor (C1).
5. The external current sharing circuit of a module power supply of claim 4, wherein: the other end of the capacitor (C1) is grounded.
6. The external current sharing circuit of a modular power supply of claim 1, wherein: the negative output end of the first module power supply (U1) is also grounded.
7. The external current sharing circuit of the module power supply of claim 1 or 6, wherein: the negative output terminal of the second module power supply (U2) is also connected to ground.
8. The external current sharing circuit of a modular power supply of claim 1, wherein: the first resistance (R1) is a sampling resistance.
9. The external current sharing circuit of the module power supply of claim 1 or 8, wherein: the seventh resistor (R7) is a sampling resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221053932.9U CN217362886U (en) | 2022-05-05 | 2022-05-05 | External current-sharing circuit of module power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221053932.9U CN217362886U (en) | 2022-05-05 | 2022-05-05 | External current-sharing circuit of module power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217362886U true CN217362886U (en) | 2022-09-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221053932.9U Active CN217362886U (en) | 2022-05-05 | 2022-05-05 | External current-sharing circuit of module power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217362886U (en) |
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2022
- 2022-05-05 CN CN202221053932.9U patent/CN217362886U/en active Active
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