Output load balancing device of constant voltage power supply and hybrid power supply

Abstract

The utility model relates to load balance technical field discloses a kind of output load balancing device and mixed power supply of constant voltage power supply of the utility model, device includes: power supply end, adjacent power supply end, sampling circuit, operational amplifier chip and control module.Adjacent power supply end is connected with adjacent constant voltage power supply;The input end of sampling circuit is connected with power supply end and adjacent power supply end respectively, sampling circuit gathers current constant voltage power supply's sampling voltage and receives adjacent constant voltage power supply's power supply voltage;The two input ends of operational amplifier chip are connected with the output end of sampling circuit, and operational amplifier chip outputs control signal when determining amplified sampling voltage greater than power supply voltage;The input end of control module is connected with the first output end of operational amplifier chip, and control module receives control signal, and reduces the output power of current constant voltage power supply.Can be parallel constant voltage power supply's output power tends to be consistent, balances the output load of multiple constant voltage power supply in mixed power supply, to improve stability.

Description

Technical Field

[0001] This utility model relates to the field of load balancing technology, and in particular to an output load balancing device for a constant voltage power supply and a mixed power supply. Background Technology

[0002] In existing technologies, parallel constant voltage power supplies have the same output voltage but different rated power, which means they have different current carrying capacities. If the load distribution is uneven, the high-power power supply may carry too much current and approach overload; while the low-power power supply may be in an inefficient underload state, and the output of the mixed-power power supply formed by parallel constant voltage power supplies is prone to fluctuations. Utility Model Content

[0003] The purpose of this utility model is to provide an output load balancing device for a constant voltage power supply and a mixed power supply, so as to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] To achieve the above objectives, some embodiments of this application provide an output load balancing device for a constant voltage power supply, wherein multiple constant voltage power supplies are connected in parallel, and each constant voltage power supply is provided with an output load balancing device; the output load balancing device includes:

[0005] Power supply end;

[0006] Adjacent power supply terminal, the adjacent power supply terminal is connected to the adjacent constant voltage power supply;

[0007] A sampling circuit, the input terminals of which are respectively connected to the power supply terminal and the adjacent power supply terminal, the sampling circuit being used to acquire the sampling voltage of the current constant voltage power supply and receive the power supply voltage of the adjacent constant voltage power supply;

[0008] An operational amplifier chip, wherein both input terminals of the operational amplifier chip are connected to the output terminal of the sampling circuit, and the operational amplifier chip is used to output a control signal when it is determined that the amplified sampling voltage is greater than the power supply voltage;

[0009] The control module has its input terminal connected to the first output terminal of the operational amplifier chip. The control module is used to receive the control signal and reduce the current output power of the constant voltage power supply.

[0010] Furthermore, the device also includes: an amplification and voltage regulation circuit;

[0011] The amplification and voltage regulation circuit is connected to the second input terminal and the second output terminal of the operational amplifier chip, respectively, and is used to regulate the amplified sampling voltage.

[0012] Furthermore, the control module includes:

[0013] The first diode, the cathode of which is connected to the first output terminal of the operational amplifier chip;

[0014] An optocoupler isolator, wherein the input terminal of the optocoupler is connected to the anode of the first diode;

[0015] A control circuit, wherein the input terminal of the control circuit is connected to the output terminal of the optocoupler isolator.

[0016] Furthermore, the sampling circuit includes:

[0017] A sampling series resistor group, one end of which is connected to the power supply terminal, and the other end of which is connected to the second input terminal of the operational amplifier chip;

[0018] The second diode has its anode connected to the second output terminal of the operational amplifier chip, and its cathode connected to the adjacent power supply terminal and the first input terminal of the operational amplifier chip, respectively.

[0019] The first pull-down resistor has one end connected to the adjacent power supply terminal and the first input terminal of the operational amplifier chip, and the other end connected to ground.

[0020] Furthermore, the amplification and voltage regulation circuit includes:

[0021] An RC series circuit is provided, one end of which is connected to the second input terminal of the operational amplifier chip, and the other end of which is connected to the second output terminal of the operational amplifier chip.

[0022] A voltage-regulating series resistor group, one end of which is connected to the second input terminal of the operational amplifier chip, and the other end of which is connected to the second output terminal of the operational amplifier chip;

[0023] The second pull-down resistor has one end connected to the second input terminal of the operational amplifier chip, and the other end connected to ground.

[0024] Furthermore, the device also includes:

[0025] The anode of the third diode is connected to the second output terminal of the operational amplifier chip and the amplification and voltage regulation circuit, respectively, and the cathode of the third diode is connected to the first input terminal of the operational amplifier chip.

[0026] The third pull-down resistor has one end connected to the cathode of the third diode and the other end connected to ground.

[0027] Furthermore, the device further includes: a first signal line; the first signal line is connected to the adjacent power supply terminal and the adjacent constant voltage power supply respectively.

[0028] Furthermore, the device also includes:

[0029] The power transmission terminal is connected to the sampling circuit;

[0030] The second signal line is connected to the power transmission terminal and the adjacent constant voltage power supply, respectively.

[0031] Furthermore, the operational amplifier chip is model LM358DT.

[0032] Some embodiments of this application provide a mixed power supply device including multiple constant voltage power supplies, each of which is provided with an output load balancing device as provided in some embodiments of this application.

[0033] The beneficial effects of this utility model are as follows: By comparing the sampled voltage after amplification of the current constant voltage power supply with the power supply voltage of the adjacent constant voltage power supply, if the sampled voltage after amplification is greater than the power supply voltage, it is considered that the output power of the current constant voltage power supply is too large. The operational amplifier chip outputs a control signal, the control module receives the control signal, and reduces the output power of the current constant voltage power supply. This allows the control module to adjust the output power, making the output power of the parallel constant voltage power supplies tend to be consistent, thus stabilizing the output of the hybrid power supply formed by the parallel constant voltage power supplies, balancing the output load of multiple constant voltage power supplies in the hybrid power supply, and improving the stability of the hybrid power supply. Attached Figure Description

[0034] Figure 1 This is a circuit diagram of an output load balancing device for a constant voltage power supply according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the parallel circuit of an output load balancing device for a constant voltage power supply according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the frame of an output load balancing device for a constant voltage power supply according to an embodiment of the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and should not be construed as limiting the scope of this invention.

[0038] It should be noted that although functional modules are divided in the diagram, in some cases, the modules can be divided differently from those in the system.

[0039] Furthermore, it is understood that the terms "first," "second," etc., used in this application may be used herein to describe various concepts, but unless specifically stated otherwise, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more features. For example, without departing from the scope of embodiments of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the words "if" or "when" as used herein may be interpreted as "in the event of," "when," or "in response to a determination."

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0041] As described in the background section, in the prior art, parallel constant voltage power supplies have the same output voltage but different rated power, which means they have different current carrying capacities. If the load distribution is uneven, the high-power power supply may carry too much current and approach overload; while the low-power power supply may be in an inefficient underload state, and the output of the mixed-power power supply formed by parallel constant voltage power supplies is prone to fluctuations.

[0042] Reference Figure 1 and Figure 3 In some embodiments of this utility model, in the current constant voltage power supply, the output load balancing device includes: a power supply terminal, an adjacent power supply terminal 100, a sampling circuit 200, an operational amplifier chip U1, and a control module 300.

[0043] An external AC power supply can be electrically connected to the current constant voltage power supply through the power supply terminal. The adjacent power supply terminal 100 is electrically connected to the adjacent constant voltage power supply, and the adjacent constant voltage power supply is adjacent to the current constant voltage power supply.

[0044] The current constant voltage power supply is connected in parallel with multiple constant voltage power supplies, and each constant voltage power supply is equipped with an output load balancing device.

[0045] The input terminal of the sampling circuit 200 is electrically connected to the power supply terminal. The sampling circuit 200 can sample the current constant voltage power supply, detect the output voltage of the power supply, and obtain the sampled voltage.

[0046] The sampling circuit 200 is electrically connected to the adjacent power supply terminal 100. The sampling circuit 200 can receive the power supply voltage output by the adjacent constant voltage power supply through the adjacent power supply terminal 100.

[0047] The first and second input terminals of the operational amplifier chip U1 are both electrically connected to the output terminal of the sampling circuit 200. That is, the fifth pin of the operational amplifier chip U1 is electrically connected to the output terminal of the sampling circuit 200, and the third pin of the operational amplifier chip U1 is electrically connected to the output terminal of the sampling circuit 200.

[0048] The second input terminal of operational amplifier chip U1 receives the sampled voltage output from sampling circuit 200, and operational amplifier chip U1 amplifies the sampled voltage. The first input terminal of operational amplifier chip U1 receives the power supply voltage output from sampling circuit 200. Operational amplifier chip U1 can compare the amplified sampled voltage with the power supply voltage, and outputs a control signal when the sampled voltage is greater than the power supply voltage.

[0049] The control signal is a low-level signal, the operational amplifier chip U1 is model LM358DT, and the power supply voltage is the maximum output voltage of the adjacent constant voltage power supply.

[0050] The input terminal of the control module 300 is electrically connected to the first output terminal of the operational amplifier chip U1, that is, the input terminal of the control module 300 is electrically connected to the first pin of the operational amplifier chip U1. The control module 300 can receive control signals, determine that the current constant voltage power supply output power is too high based on the control signals, and adjust the current constant voltage power supply to reduce the current constant voltage power supply output power.

[0051] By comparing the amplified sampled voltage of the current constant voltage power supply with the power supply voltage of the adjacent constant voltage power supply, if the amplified sampled voltage is greater than the power supply voltage, it is considered that the output power of the current constant voltage power supply is too high. The operational amplifier chip U1 outputs a control signal, and the control module 300 receives the control signal to reduce the output power of the current constant voltage power supply. This allows the control module 300 to adjust the output power, making the output power of the parallel constant voltage power supplies tend to be consistent, thus stabilizing the output of the mixed power supply formed by the parallel constant voltage power supplies, balancing the output load of multiple constant voltage power supplies in the mixed power supply, and improving the stability of the mixed power supply.

[0052] Reference Figure 1 and Figure 3In some embodiments of this utility model, the control module 300 includes: a first diode D1, an optocoupler U2, and a control circuit.

[0053] The anode of the first diode D1 is electrically connected to the cathode of the light-emitting diode of the optocoupler U2, that is, electrically connected to the input terminal of the optocoupler U2. The cathode of the first diode D1 is electrically connected to the first output terminal of the operational amplifier chip U1, that is, the cathode of the first diode D1 is electrically connected to the first pin of the operational amplifier chip U1.

[0054] The anode of the LED in optocoupler U2 is electrically connected to the auxiliary power supply. When the operational amplifier chip U1 outputs a control signal, i.e., a low-level signal, the LED in optocoupler U2 turns on, which in turn turns on the phototransistor in optocoupler U2.

[0055] The input terminal of the control circuit is electrically connected to the output terminal of the optocoupler U2, which is also electrically connected to the phototransistor of the optocoupler U2. When the operational amplifier chip U1 outputs a control signal, the light-emitting diode of the optocoupler U2 conducts, causing the phototransistor of the optocoupler U2 to conduct. The control circuit then determines that the output power of the current constant voltage power supply is too high, adjusts the current constant voltage power supply, and reduces its output power so that the parallel output power can tend to be consistent.

[0056] Reference Figure 1 and Figure 3 In some embodiments of this utility model, the sampling circuit 200 includes: a sampling series resistor group, a second diode D2, and a first pull-down resistor R10;

[0057] One end of the sampling series resistor group is electrically connected to the power supply terminal, and the other end of the sampling series resistor group is electrically connected to the second input terminal of the operational amplifier chip U1, that is, to the fifth pin of the operational amplifier chip U1.

[0058] The sampling series resistor group includes a third resistor R3 and a fourth resistor R4. One end of the third resistor R3 is electrically connected to the power supply terminal, and the other end of the third resistor R3 is electrically connected to one end of the fourth resistor R4 and the output terminal. One end of the fourth resistor R4 is electrically connected to the other end of the third resistor R3 and the power supply terminal, and the other end of the fourth resistor R4 is electrically connected to the fifth pin of the operational amplifier chip U1. The resistance value of the third resistor R3 is determined by the full output power and rated voltage of the current constant voltage power supply, that is, the resistance value of the third resistor R3 is equal to 0.05 / (full output power / rated voltage).

[0059] The anode of the second diode D2 is connected to the second output terminal of the operational amplifier chip U1, that is, it is electrically connected to the seventh pin of the operational amplifier chip U1. The cathode of the second diode D2 is electrically connected to the adjacent power supply terminal 100. The cathode of the second diode D2 is also electrically connected to the first input terminal of the operational amplifier chip U1, that is, it is electrically connected to the third pin of the operational amplifier chip U1.

[0060] One end of the first pull-down resistor R10 is electrically connected to the cathode of the second diode D2. The other end of the first pull-down resistor R10 is also electrically connected to the first input terminal of the operational amplifier chip U1, specifically to its third pin. One end of the first pull-down resistor R10 is also electrically connected to the adjacent power supply terminal 100. The other end of the first pull-down resistor R10 is grounded.

[0061] Reference Figure 1 and Figure 3 In some embodiments of this utility model, the device further includes: an amplification and voltage regulation circuit 400.

[0062] One end of the amplification and voltage regulation circuit 400 is electrically connected to the second input terminal of the operational amplifier chip U1, that is, electrically connected to the sixth pin of the operational amplifier chip U1. The other end of the amplification and voltage regulation circuit 400 is electrically connected to the second output terminal of the operational amplifier chip U1, that is, electrically connected to the seventh pin of the operational amplifier chip U1.

[0063] The amplifier and voltage regulator circuit 400 includes: a second pull-down resistor R5, an RC series circuit, and a voltage regulator series resistor group.

[0064] One end of the second pull-down resistor R5 is electrically connected to the second input terminal of the operational amplifier chip U1, that is, to the sixth pin of the operational amplifier chip U1. The other end of the second pull-down resistor R5 is grounded.

[0065] One end of the RC series circuit is electrically connected to the second input terminal of the operational amplifier chip U1, that is, to the sixth pin of the operational amplifier chip U1. The other end of the RC series circuit is electrically connected to the second output terminal of the operational amplifier chip U1, that is, to the seventh pin of the operational amplifier chip U1. The other end of the RC series circuit is also electrically connected to the anode of the second diode D2.

[0066] One end of the voltage-regulating series resistor group is electrically connected to the second input terminal of the operational amplifier chip U1, that is, to the sixth pin of the operational amplifier chip U1. The other end of the voltage-regulating series resistor group is electrically connected to the second output terminal of the operational amplifier chip U1, that is, to the seventh pin of the operational amplifier chip U1. The other end of the voltage-regulating series resistor group is also electrically connected to the anode of the second diode D2.

[0067] The voltage-stabilizing series resistor group includes: adjustable resistor PR1, seventh resistor R7, and eighth resistor R8.

[0068] The sampling voltage is stabilized and amplified by using an RC series circuit and a voltage-regulating series resistor group, while reducing circuit oscillation.

[0069] Reference Figure 1 and Figure 3 In some embodiments of this utility model, the output load balancing device further includes: a third diode D3 and a third pull-down resistor R9.

[0070] The anode of the third diode D3 is electrically connected to the second output terminal of the operational amplifier chip U1, that is, to the sixth pin of the operational amplifier chip U1. The anode of the third diode D3 is also electrically connected to the amplification and voltage regulation circuit 400, that is, to the other end of the RC series circuit and the other end of the voltage regulation series resistor group.

[0071] The cathode of the third diode D3 is electrically connected to the first input terminal of the operational amplifier chip U1, that is, electrically connected to the second pin of the operational amplifier chip U1.

[0072] One end of the third pull-down resistor R9 is electrically connected to the cathode of the third diode D3, and the other end of the third pull-down resistor R9 is grounded.

[0073] In one embodiment, the sampling series resistor group samples the current constant voltage power supply to obtain a sampled voltage. This sampled voltage is output to the fifth pin of the operational amplifier chip U1. The sampled voltage is amplified by the amplifier built into the operational amplifier chip U1. The amplified sampled voltage is output through the seventh pin of the operational amplifier chip U1, and after feedback by the third diode D3 and voltage regulation by the amplification and regulation circuit 400, the amplified sampled voltage is output to the second pin of the operational amplifier chip U1 for power supply voltage comparison. The power supply voltage is input to the third pin of the operational amplifier chip U1 through the sampling circuit 200, and compared by the comparator built into the operational amplifier chip U1 to output a control signal.

[0074] Reference Figure 1 , Figure 2 and Figure 3 In some embodiments of this utility model, the output load balancing device further includes: a first signal, a second signal line, and a power transmission terminal.

[0075] The first signal line is electrically connected to the adjacent power supply terminal 100. The first signal line is also electrically connected to the adjacent constant voltage power supply. Through the first signal line, the adjacent constant voltage power supply inputs the power supply voltage to the output load balancing device of the current constant voltage power supply.

[0076] The power transmission end is electrically connected to the sampling circuit 200, and the power transmission end is electrically connected to the other end of the third resistor R3 so that the third resistor R3 can perform sampling.

[0077] The second signal line is electrically connected to the power transmission end, and the second signal line is also electrically connected to the adjacent constant voltage power supply, so as to realize parallel output with multiple constant voltage power supplies.

[0078] Reference Figure 1 and Figure 2 In some embodiments of another aspect of this utility model, a mixed power supply includes: multiple constant voltage power supplies connected in parallel with each other, and each constant voltage power supply is provided with an output load balancing device as described in some embodiments of this utility model.

[0079] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An output load balancing device for a constant voltage power supply, characterized in that, The multiple constant voltage power supplies are connected in parallel, and each constant voltage power supply is equipped with an output load balancing device; The output load balancing device includes: Power supply end; Adjacent power supply terminal, the adjacent power supply terminal is connected to the adjacent constant voltage power supply; A sampling circuit, wherein the input terminals of the sampling circuit are respectively connected to the power supply terminal and the adjacent power supply terminal, and the sampling circuit is used to acquire the sampling voltage of the current constant voltage power supply and receive the power supply voltage of the adjacent constant voltage power supply; An operational amplifier chip, wherein both input terminals of the operational amplifier chip are connected to the output terminal of the sampling circuit, and the operational amplifier chip is used to output a control signal when it is determined that the amplified sampling voltage is greater than the power supply voltage; The control module has its input terminal connected to the first output terminal of the operational amplifier chip. The control module is used to receive the control signal and reduce the current output power of the constant voltage power supply.

2. The output load balancing device for a constant voltage power supply according to claim 1, characterized in that, The device further includes: an amplification and voltage regulation circuit; The amplification and voltage regulation circuit is connected to the second input terminal and the second output terminal of the operational amplifier chip, respectively, and is used to regulate the amplified sampling voltage.

3. The output load balancing device for a constant voltage power supply according to claim 1, characterized in that, The control module includes: The first diode, the cathode of which is connected to the first output terminal of the operational amplifier chip; An optocoupler isolator, the input terminal of which is connected to the anode of the first diode; and a control circuit, the input terminal of which is connected to the output terminal of the optocoupler isolator.

4. The output load balancing device for a constant voltage power supply according to claim 1, characterized in that, The sampling circuit includes: A sampling series resistor group, one end of which is connected to the power supply terminal, and the other end of which is connected to the second input terminal of the operational amplifier chip; The second diode has its anode connected to the second output terminal of the operational amplifier chip, and its cathode connected to the adjacent power supply terminal and the first input terminal of the operational amplifier chip, respectively. The first pull-down resistor has one end connected to the adjacent power supply terminal and the first input terminal of the operational amplifier chip, and the other end connected to ground.

5. The output load balancing device for a constant voltage power supply according to claim 2, characterized in that, The amplification and voltage regulation circuit includes: An RC series circuit is provided, one end of which is connected to the second input terminal of the operational amplifier chip, and the other end of which is connected to the second output terminal of the operational amplifier chip. A voltage-regulating series resistor group, one end of which is connected to the second input terminal of the operational amplifier chip, and the other end of which is connected to the second output terminal of the operational amplifier chip; The second pull-down resistor has one end connected to the second input terminal of the operational amplifier chip, and the other end connected to ground.

6. The output load balancing device for a constant voltage power supply according to claim 2, characterized in that, The device further includes: The anode of the third diode is connected to the second output terminal of the operational amplifier chip and the amplification and voltage regulation circuit, respectively, and the cathode of the third diode is connected to the first input terminal of the operational amplifier chip. The third pull-down resistor has one end connected to the cathode of the third diode and the other end connected to ground.

7. The output load balancing device for a constant voltage power supply according to claim 1, characterized in that, The device further includes: a first signal line; the first signal line is connected to the adjacent power supply terminal and the adjacent constant voltage power supply respectively.

8. The output load balancing device for a constant voltage power supply according to claim 1, characterized in that, The device further includes: The power transmission terminal is connected to the sampling circuit; The second signal line is connected to the power transmission terminal and the adjacent constant voltage power supply, respectively.

9. The output load balancing device for a constant voltage power supply according to claim 1, characterized in that, The operational amplifier chip is model LM358DT.

10. A mixed-power power supply, characterized in that, It includes multiple constant voltage power supplies, each of which is equipped with an output load balancing device as described in any one of claims 1 to 9.

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