CN221150961U - DC power supply current equalizing circuit - Google Patents
DC power supply current equalizing circuit Download PDFInfo
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- CN221150961U CN221150961U CN202322449549.6U CN202322449549U CN221150961U CN 221150961 U CN221150961 U CN 221150961U CN 202322449549 U CN202322449549 U CN 202322449549U CN 221150961 U CN221150961 U CN 221150961U
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Abstract
The utility model discloses a direct current power supply current equalizing circuit, which comprises: the parallel operation system comprises a current detection module, a parallel operation interface module, a parallel operation current signal processing module and an isolation control circuit; the current detection module includes: the parallel interface module comprises a current sensor and a current sampling resistor, wherein the parallel interface module comprises: a first connection interface terminal and a second connection interface terminal; the parallel current electric signal processing module comprises: the device comprises a first-stage voltage follower circuit, an average value calculation circuit and a difference value calculation circuit; the first stage voltage follower circuit includes: the first voltage follower and the peripheral resistor device, wherein the same-direction input end of the first voltage follower is coupled to the output end of the first wiring interface terminal through the coupling peripheral resistor device, and the opposite input end of the first voltage follower is coupled to the input end of the average value calculation circuit; the utility model can construct a stable direct current power supply system by the current sharing control strategy applied to the power supply, and has good current sharing effect.
Description
Technical Field
The utility model relates to the technical field of direct current power supplies, in particular to a direct current power supply current sharing circuit.
Background
With the development of energy storage technology and new energy technology, electric equipment generally needs a large-capacity and large-current direct current power supply, and as a single direct current power supply can not output the maximum capacity and the current can not be very large, a plurality of direct current power supplies are required to be connected in parallel to supply power to a load, so that a so-called distributed power supply system is formed.
Current power supply systems are prone to one problem: the multiple parallel direct current power supplies are not possible to completely coincide in parameters, and are influenced by various external factors, the respective output currents are also different, so that the output voltage is easy to be lower when the difference is too large, the rated power cannot be reached, and part of the direct current power supplies can be burnt out when the difference is too large.
The prior art can not meet the demands of people at present, and based on the present situation, the prior art needs to be improved.
Disclosure of utility model
The utility model aims to provide a direct-current power supply current equalizing circuit so as to solve the problems in the background technology.
The utility model provides a direct current power supply current equalizing circuit which comprises a current detection module, a parallel operation interface module, a parallel operation current signal processing module and an isolation control circuit, wherein the parallel operation interface module is connected with the current detection module; wherein,
The current detection module comprises, but is not limited to, a current sensor, a current sampling resistor and other devices, each direct current power supply is provided with the current detection module, and the current sensor is taken as an example for explanation in the embodiment;
The parallel operation interface module comprises: the input end of the first wiring interface terminal is coupled with the current sensor, and the output end of the first wiring interface terminal is coupled with the input end of the parallel-current signal processing module; the second wiring interface terminal is connected with a SYS_I signal port of an external direct current power supply, and a plurality of direct current power supplies are connected together through parallel wires;
The parallel current electric signal processing module comprises: the device comprises a first-stage voltage follower circuit, an average value calculation circuit and a difference value calculation circuit;
The first stage voltage follower circuit includes: the first voltage follower and the peripheral resistor device, wherein the same-direction input end of the first voltage follower is coupled to the output end of the first wiring interface terminal through the coupling peripheral resistor device, the reverse input end of the first voltage follower is coupled to the input end of the average value calculation circuit, the output end of the first stage voltage follower circuit is provided with two paths of outputs, the first path of output is coupled to the input end of the average value calculation circuit, and the other path of output is coupled to the input end of the difference value calculation circuit;
the average value calculation circuit includes: the input end of the resistor R2 is coupled with the output end of the first-stage voltage follower circuit, the output end of the resistor R2 is divided into two paths of outputs, one path of output end is coupled with the second wiring interface terminal, the other path of output end is connected with the resistor R3 in series, and the other end of the resistor R3 is coupled with the same-direction input end of the second voltage follower circuit;
The difference value operation circuit includes: the output end of the second voltage follower is coupled with the resistor R4, the other end of the resistor R4 is coupled with the reverse input end of the comparator, one end of the resistor R1 is coupled with the reverse input end of the comparator, and the other end of the resistor R1 is coupled with the output end of the comparator for adjusting the amplification factor; the output end of the first voltage follower is coupled to the same-direction input end of the comparator through a series connection resistor R7, and the resistor R8 is used for grounding;
The isolation control circuit includes: the resistor R5, the triode Q1, the optocoupler isolation module and the PWM controller; the output end of the comparator is coupled with a resistor R5, the other end of the resistor R5 is coupled with the base electrode of a triode Q1, and the collector electrode of the triode Q1 is coupled to the PWM controller through a coupling optical coupling isolation module; the front end of the PWM controller is also loaded with a control signal COM.
The utility model has the following beneficial effects:
The utility model realizes direct current sharing treatment of each direct current power supply module through the current sharing control strategy, can construct a stable direct current power supply system when applied to a power supply, has good current sharing effect, effectively eliminates the conditions of large output fluctuation and easy damage to the power supply caused by non-current sharing, and greatly improves the system stability.
Drawings
Fig. 1 is a schematic circuit structure of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the present utility model without making any inventive effort fall within the scope of the present utility model.
Referring to fig. 1, the present utility model provides a dc power supply current equalizing circuit, comprising: the parallel operation system comprises a current detection module, a parallel operation interface module, a parallel operation current signal processing module and an isolation control circuit;
The current detection module includes devices such as but not limited to current sensor, current sampling resistor, and the current detection module is located DC power supply inside, and every DC power supply all is equipped with current detection module, and current detection module of this embodiment adopts current sensor to take the example, parallel operation interface module includes: the input end of the first wiring interface terminal is coupled with the current sensor, and the output end of the first wiring interface terminal is coupled with the input end of the parallel-current signal processing module; the weak signal output by the current sensor is transmitted to the parallel-current signal processing module through the first wiring interface terminal;
the second wiring interface terminal is connected with SYS_I signals output by current sensors in a plurality of external direct current power supplies, and the plurality of direct current power supplies are connected together through parallel wires; SYS_I signals output by the current sensors in the plurality of direct current power supplies are loaded to the input end of the second wiring interface terminal together; in the embodiment, the dc power supply is provided with at least 2 interfaces, and then the interfaces of two adjacent dc power supplies are connected, so that the serial connection of a plurality of dc power supplies can be realized, taking three dc power supplies as an example, the interface of the first dc power supply is the interface 1 and the interface 2, the interface of the second dc power supply is the interface 3 and the interface 4, and the interface of the third dc power supply is the interface 5 and the interface 6, and then when the interfaces are connected, only the interface 2 is required to be connected with the interface 3, the interface 4 is connected with the interface 5, and finally the 3 dc power supplies can be connected together by outputting a sys_i signal to the input end of the second wiring interface terminal through the interface 6, and the connection can be realized in the same way for the N dc power supplies.
The parallel current electric signal processing module comprises: the device comprises a first-stage voltage follower circuit, an average value calculation circuit and a difference value calculation circuit; the first stage voltage follower circuit includes: the first voltage follower and the peripheral resistor device, wherein the same-direction input end of the first voltage follower is coupled to the output end of the first wiring interface terminal through the coupling peripheral resistor device, the reverse input end of the first voltage follower is coupled to the input end of the average value calculation circuit, the output end of the first stage voltage follower circuit is provided with two paths of outputs, the first path of output is coupled to the input end of the average value calculation circuit, and the other path of output is coupled to the input end of the difference value calculation circuit; the average value calculation circuit includes: the input end of the resistor R2 is coupled with the output end of the first-stage voltage follower circuit, the output end of the second wiring interface terminal is coupled with the output end of the resistor R2, the resistor R2 is connected with the resistor R3 in series, and the other end of the resistor R3 is coupled with the same-direction input end of the second voltage follower circuit; the difference value operation circuit includes: the output end of the second voltage follower is coupled with the resistor R4, the other end of the resistor R4 is coupled with the reverse input end of the comparator, one end of the resistor R1 is coupled with the reverse input end of the comparator, and the other end of the resistor R1 is coupled with the output end of the comparator for adjusting the amplification factor; the output end of the first voltage follower is coupled to the same-direction input end of the comparator through a series connection resistor R7, and the resistor R7 is coupled with a resistor R8 to form a voltage dividing circuit; in the embodiment, an average value calculating circuit is formed by a resistor R2, a resistor R3 and a first voltage follower U1A, wherein a first-stage voltage follower circuit formed by a resistor R6 and a first voltage follower U1C is used for dividing a local current signal i1 of a local direct current power supply output by a current sensor through a resistor R7 and a resistor R8 and then reaching a non-inverting input end of a comparator U1B; the second wiring interface terminal firstly enables a current signal output by the first external direct current power supply to reach the input end of the second voltage follower U1A through a resistor R3; similarly, the 2 nd to nth parallel-connected direct current power supplies have the same signal flow direction, so that the average value of the output currents of the N direct current power supplies can be calculated at the output end of the second voltage follower U1A, and the average value is UA= (Ui1+Ui2+ … +Uin)/N; wherein Ui1 is a current value output by the first dc power supply, and Ui2 is a current value output by the second dc power supply. . . N represents the number of parallel direct current power supplies. In the embodiment, the difference value operation circuit is composed of a resistor R4, a resistor R1, a resistor R7, a resistor R8 and a comparator U1B, according to the circuit structure of the first-stage voltage follower circuit and the average value calculation circuit, the signal of the reverse input end of the comparator U1B is N and the average value of the power output current, the signal of the same-direction input end of the comparator U1B is the output current value of the local direct current power supply, the output end of the comparator U1B outputs the difference value between the local current and the average current of the system through adjusting the resistance values of the resistor R4, the resistor R1, the resistor R7 and the resistor R8, namely Ub=U1- (Ui1+Ui2+ … +Uin)/N, this difference is used to adjust the local PWM controller.
The isolation control circuit includes: the resistor R5, the triode Q1, the optocoupler isolation module and the PWM controller; the output end of the comparator is coupled with a resistor R5, the other end of the resistor R5 is coupled with the base electrode of a triode Q1, and the collector electrode of the triode Q1 is coupled to the PWM controller through a coupling optical coupling isolation module; the front end of the PWM controller is also loaded with a control signal COM. In the embodiment, the optocoupler isolation module electrically isolates the front-stage signal from the PWM controller, so that the anti-interference capability is improved, when the PWM controller processes the signal sent by the front end, if the voltage output by the comparator is Ub, when Ub is more than 0, the current of the local machine is larger than the average current of the system, and the duty ratio of PWM is reduced by pulling down the COM signal; similarly, when Ub is smaller than 0, the current of the local machine is smaller than the average current of the system, the duty ratio of PWM is increased by releasing the COM signal, and finally the system is maintained in a dynamic balance, so that the current sharing of N parallel power supplies in the system is realized.
Although the present utility model has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present utility model.
Claims (8)
1. The utility model provides a direct current power supply current sharing circuit which characterized in that includes: the parallel operation system comprises a current detection module, a parallel operation interface module, a parallel operation current signal processing module and an isolation control circuit;
The current detection module includes: the current detection module is positioned in the direct-current power supply;
The parallel operation interface module comprises: a first connection interface terminal and a second connection interface terminal; the input end of the first wiring interface terminal is coupled with the current sensor, and the output end of the first wiring interface terminal is coupled with the input end of the parallel-current signal processing module; the input end of the second wiring interface terminal is connected with SYS_I signals output by current sensors in a plurality of external direct current power supplies, and the plurality of direct current power supplies are connected together through parallel wires;
The parallel current electric signal processing module comprises: the device comprises a first-stage voltage follower circuit, an average value calculation circuit and a difference value calculation circuit;
The first stage voltage follower circuit includes: the first voltage follower and the peripheral resistor device, wherein the same-direction input end of the first voltage follower is coupled to the output end of the first wiring interface terminal through the coupling peripheral resistor device, the reverse input end of the first voltage follower is coupled to the input end of the average value calculation circuit, the output end of the first stage voltage follower circuit is provided with two paths of outputs, the first path of output is coupled to the input end of the average value calculation circuit, and the other path of output is coupled to the input end of the difference value calculation circuit;
The average value calculation circuit includes: a resistor R2, a resistor R3 and a second voltage follower; the input end of the resistor R2 is coupled with the output end of the first-stage voltage follower circuit, the output end of the second wiring interface terminal is coupled with the output end of the resistor R2, the resistor R2 is connected with the resistor R3 in series, and the other end of the resistor R3 is coupled with the same-direction input end of the second voltage follower circuit;
The difference value operation circuit includes: the output end of the second voltage follower is coupled with the resistor R4, the other end of the resistor R4 is coupled with the reverse input end of the comparator, one end of the resistor R1 is coupled with the reverse input end of the comparator, and the other end of the resistor R1 is coupled with the output end of the comparator; the output end of the first voltage follower is coupled to the same-direction input end of the comparator through a series connection resistor R7, and the resistor R7 is coupled with a resistor R8 to form a voltage dividing circuit;
The isolation control circuit includes: the resistor R5, the triode Q1, the optocoupler isolation module and the PWM controller; the output end of the comparator is coupled with a resistor R5, the other end of the resistor R5 is coupled with the base electrode of a triode Q1, and the collector electrode of the triode Q1 is coupled to the PWM controller through a coupling optical coupling isolation module; the front end of the PWM controller is also loaded with a control signal COM.
2. The dc power supply current sharing circuit as claimed in claim 1, wherein: the output end of the second voltage follower outputs the following result: average value of output current of N DC power supplies.
3. The dc power supply current sharing circuit as claimed in claim 2, wherein: the calculation formula of the average value is as follows:
UA＝(Ui1+Ui2+…+Uin)/n；
The current value of the first direct current power supply is output by Ui1, the current value of the second direct current power supply is output by Ui2, and n represents the number of parallel direct current power supplies.
4. The dc power supply current sharing circuit as claimed in claim 1, wherein: the signal of the reverse input end of the comparator is the average value of N power supply output currents;
And the signal of the homodromous input end of the comparator is the output current value of the local direct current power supply.
5. The dc power supply current sharing circuit as claimed in claim 1, wherein: the difference between the local current and the average current of the system can be calculated by adjusting the resistance values of the resistor R4, the resistor R1, the resistor R7 and the resistor R8 at the output end of the comparator U1B.
6. The dc power supply current sharing circuit as defined in claim 5, wherein: the calculation formula of the difference value is as follows:
Ub＝Ui1-(Ui1+Ui2+…+Uin)/n；
The current value of the first direct current power supply is output by Ui1, the current value of the second direct current power supply is output by Ui2, and n represents the number of parallel direct current power supplies.
7. The dc power supply current sharing circuit as defined in claim 6, wherein: the difference value is used for adjusting the local PWM controller, and when Ub is more than 0, namely the local current is larger than the average current of the system, the duty ratio of PWM is reduced by pulling down the COM signal, so that the current sharing of a plurality of parallel operation power supplies is achieved.
8. The dc power supply current sharing circuit as defined in claim 6, wherein: the difference value is used for adjusting the local PWM controller, and when Ub is smaller than 0, namely the local current is smaller than the average current of the system, the duty ratio of PWM is increased by releasing the COM signal, so that the current sharing of a plurality of parallel operation power supplies is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322449549.6U CN221150961U (en) | 2023-09-08 | 2023-09-08 | DC power supply current equalizing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322449549.6U CN221150961U (en) | 2023-09-08 | 2023-09-08 | DC power supply current equalizing circuit |
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| Publication Number | Publication Date |
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| CN221150961U true CN221150961U (en) | 2024-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322449549.6U Active CN221150961U (en) | 2023-09-08 | 2023-09-08 | DC power supply current equalizing circuit |
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- 2023-09-08 CN CN202322449549.6U patent/CN221150961U/en active Active
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