CN219960389U - Power supply control circuit and power supply circuit - Google Patents
Power supply control circuit and power supply circuit Download PDFInfo
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- CN219960389U CN219960389U CN202321300065.9U CN202321300065U CN219960389U CN 219960389 U CN219960389 U CN 219960389U CN 202321300065 U CN202321300065 U CN 202321300065U CN 219960389 U CN219960389 U CN 219960389U
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Abstract
The utility model discloses a power supply control circuit and a power supply circuit. The power supply control circuit comprises a power supply end, a plurality of power supply circuits, a sampling circuit, a reference circuit and a feedback circuit, wherein the sampling circuit comprises a plurality of sampling sub-circuits, the sampling sub-circuits are connected with the power supply circuits in a one-to-one correspondence manner, each sampling sub-circuit comprises a sampling output end, and the sampling sub-circuits detect the power supply voltage of the connected power supply circuit and output corresponding detection voltage through the sampling output ends; the reference circuit comprises reference output ends, is connected with each sampling output end and is communicated with the sampling output end outputting the maximum detection voltage; the feedback circuit comprises a plurality of feedback sub-circuits, and the feedback sub-circuits are connected with the sampling output ends in a one-to-one correspondence manner and are connected with the reference output ends and the power supply circuits corresponding to the connected sampling output ends. The power supply circuit includes a power supply control circuit. The carrying capacity can be improved.
Description
Technical Field
The utility model relates to the technical field of electronics, in particular to a power supply control circuit and a power supply circuit.
Background
Currently, high power supplies may be required to drive some loads into operation. However, high power supplies tend to be costly, bulky, and unsuitable for many applications (e.g., low cost consumer electronics cards). In view of this, many solutions now connect a plurality of identical power supply modules in parallel to obtain a high power supply.
However, these parallel power supply modules have a difference in output voltage and may not be identical. This results in a power module with higher output voltage, a power module with higher output current, and a power module with lower output voltage, with lower output current, and therefore, uniform current load cannot be realized, and the load capacity is reduced.
Disclosure of Invention
In view of the above, embodiments of the present utility model provide a power control circuit and a power circuit, which can improve the load capacity of the circuit.
In one aspect, the present utility model provides a power supply circuit comprising:
the power supply end is used for connecting a load;
the power supply circuits are connected with the power supply ends;
the sampling circuit comprises a plurality of sampling sub-circuits, the sampling sub-circuits are connected with the power supply circuits in a one-to-one correspondence manner, each sampling sub-circuit comprises a sampling output end, and the sampling sub-circuits detect the power supply voltage of the connected power supply circuit and output corresponding detection voltage through the sampling output ends;
the reference circuit comprises a reference output end, and is connected with each sampling output end and communicated with the sampling output end outputting the maximum detection voltage;
and the feedback circuit comprises a plurality of feedback sub-circuits, wherein the feedback sub-circuits are connected with the sampling output ends in a one-to-one correspondence manner and are connected with the reference output ends and power supply circuits corresponding to the connected sampling output ends so as to control at least part of the power supply circuits to adjust the power supply voltage based on the voltages of the reference output ends and the sampling output ends.
In some embodiments, the reference circuit includes a plurality of reference subcircuits in one-to-one correspondence with the sampling subcircuits, the reference subcircuits being connected between the reference output terminals and the sampling output terminals of the corresponding sampling subcircuits, the reference subcircuits being turned on when the voltage of the connected sampling output terminals is higher than the voltage of the reference output terminals.
In some embodiments, the reference sub-circuit includes a first unidirectional conduction device, the first unidirectional conduction device includes a first end and a second end, the first end of the first unidirectional conduction device is connected to the sampling output end of the corresponding sampling circuit, the second end of the first unidirectional conduction device is connected to the reference output end, and when the voltage of the first end is higher than the voltage of the second end, the first unidirectional conduction device is turned on.
In some embodiments, the sampling sub-circuit includes a sensing resistor connected in series with a power supply circuit corresponding to the sampling sub-circuit, and a voltage detection circuit connected across the sensing resistor and connected with the sampling output.
In some embodiments, the voltage detection circuit includes a first comparator including a first forward input, a second reverse input, and a first output, the first forward input and the second reverse input being connected across the sense resistor, the first output being connected with the sampling output.
In some embodiments, the sampling sub-circuit further comprises a voltage follower connected between the first output of the first comparator and the sampling output.
In some embodiments, the feedback sub-circuit includes a second comparator including a second forward input connected to the corresponding sampling output, a second reverse input connected to the reference output, and a second output connected to a power supply circuit corresponding to the connected sampling output.
In some embodiments, the power supply circuit includes a power input terminal, a power output terminal, a first resistor and a second resistor, the feedback sub-circuit includes a voltage regulating resistor, the power input terminal is used for connecting a power source, the power output terminal is connected with the power supply terminal, the first resistor and the second resistor are connected in series with the power output terminal and a ground terminal, a connection point of the first resistor and the second resistor is used for accessing an input voltage of the power input terminal, and the voltage regulating resistor is connected between the second output terminal and the connection point.
In some embodiments, the power supply circuit includes a power supply chip including a first chip end and a second chip end, the first chip end being connected to the power input end, the second chip end being connected to a connection point of the first resistor and the second resistor.
In some embodiments, the power control circuit includes a second unidirectional-conduction device connected between the power supply circuit and a power supply terminal, the unidirectional-conduction device being turned off when a power supply voltage of the power supply circuit is lower than a voltage of the power supply terminal.
In another aspect the utility model provides a power supply circuit comprising a power supply control circuit as described in any one of the preceding claims.
In some embodiments of the present utility model, a sampling sub-circuit is provided for each power supply circuit, and a sampling output end outputting a maximum detection voltage is connected to a reference output end through a reference circuit, and a feedback circuit adjusts a power supply voltage of at least part of the power supply circuits based on voltages of the reference output end and each sampling output end. Therefore, the power supply voltage output by each power supply circuit can be kept the same, so that the uniform current load can be realized, and the load capacity is improved.
Drawings
The features and advantages of the present utility model will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the utility model in any way, in which:
FIG. 1 shows a block schematic diagram of a power supply circuit in some techniques;
FIG. 2 shows a block diagram of a power control circuit provided by one embodiment of the present utility model;
FIG. 3 illustrates a circuit diagram of a power control circuit provided in some embodiments of the utility model;
fig. 4 shows a block diagram of a power supply circuit according to an embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which a person skilled in the art would obtain without making any inventive effort, are within the scope of the utility model.
Referring to fig. 1, a block diagram of a power circuit 100 in some technologies is shown. In fig. 1, a power circuit 100 includes a plurality of power modules 11 and a power supply terminal 12. The plurality of power modules 11 are connected to a power supply terminal 12, and the power supply terminal 12 is connected to a load 13. The plurality of power modules 11 simultaneously supply power to the load 13 through the power supply terminals 12. By connecting a plurality of power supply modules 11 in parallel, the output power and the load capacity of the power supply circuit 100 can be improved.
However, in practical applications, the output voltages of the power modules 11 cannot be completely the same, which results in a power module 11 with a higher output voltage, a power module 11 with a large output current and a power module 11 with a lower output voltage, and a small output current. The power supply circuit 100 cannot realize the current sharing load, and the load capacity is reduced.
In view of the above, the present utility model provides a power control circuit that can improve the load capacity. Referring to fig. 2, a block diagram of a power control circuit 200 according to an embodiment of the utility model is shown. In fig. 2, the power supply control circuit 200 includes a power supply terminal 25, a plurality of power supply circuits 21, a sampling circuit 22, a reference circuit 23, and a feedback circuit 24. Wherein the power supply terminal 25 is for connecting a load. The plurality of power supply circuits 21 are connected to a power supply terminal 25 to supply power to a load through the power supply terminal 25.
The sampling circuit 22 includes a plurality of sampling sub-circuits 221, the sampling sub-circuits 221 are connected to the power supply circuit 21 in one-to-one correspondence, and each sampling sub-circuit 221 includes a sampling output terminal 222. The sampling sub-circuit 22 detects the power supply voltage of the connected power supply circuit 21, and outputs a corresponding detection voltage through the sampling output terminal 222. Specifically, the sampling sub-circuits 221 corresponding to different power supply circuits 21 may be identical. The magnitude of the detection voltage output by each sampling output 222 may be proportional to the magnitude of the supply voltage of the connected supply circuit 21. In this way, the magnitude relation of the power supply voltages output from the different power supply circuits 21 can be determined based on the magnitude of the detection voltages output from the respective sampling sub-circuits 221. For example, if the sampling sub-circuit a is connected to the power supply circuit a, the sampling sub-circuit B is connected to the power supply circuit B, the detection voltage output by the sampling output terminal a of the sampling sub-circuit a is 3 volts, and the detection voltage output by the sampling output terminal of the sampling sub-circuit B is 3.1 volts, it can be determined that the power supply voltage output by the power supply circuit B is greater than the power supply voltage output by the power supply circuit a.
The reference circuit 23 includes reference output terminals 231, and the reference circuit 23 is connected to each of the sampling output terminals 222 and communicates the sampling output terminal 222 outputting the maximum detection voltage with the reference output terminal 231. For example, assume that the power supply control circuit 200 includes a power supply circuit a and a power supply circuit B. The detection voltage output by the sampling output terminal a corresponding to the power supply circuit a is 3 volts, and the detection voltage output by the sampling output terminal B corresponding to the power supply circuit B is 3.1 volts, so that the reference circuit 23 can connect the sampling output terminal B with the reference output terminal 231 and disconnect the sampling output terminal a from the reference output terminal 231. After the sampling output 222 outputting the maximum detection voltage is connected to the reference output 231, the voltage of the reference output 231 is the maximum detection voltage.
It will be appreciated that in the case where there is fluctuation in the supply voltage of each of the power supply circuits 21, the detection voltage outputted from each of the sampling output terminals 222 also fluctuates, and therefore, the reference circuit 23 can dynamically adjust the sampling output terminal 222 in communication with the reference output terminal 231 based on the detection voltage outputted from each of the sampling output terminals 222. For example, at time 1, the detection voltage output by the sampling output terminal a is maximum; at time 2, the detected voltage output by the sampling output terminal B is maximum, and the reference circuit 23 may communicate the sampling output terminal a with the reference output terminal 231 at time 1 and the sampling output terminal B with the reference output terminal 231 at time 2.
The feedback circuit 24 includes a plurality of feedback sub-circuits 241, and the feedback sub-circuits 241 are connected to the sampling output terminals 222 in a one-to-one correspondence, and to the reference output terminal 231, and the power supply circuits 21 corresponding to the connected sampling output terminals 222, to control at least part of the power supply circuits 21 to adjust the power supply voltage based on the voltages of the reference output terminal 231 and the respective sampling output terminals 222. To clearly illustrate the connection between the feedback sub-circuit 241, the sampling output 222, the reference output 231 and the power supply circuit 21, an example is described below in connection with fig. 1. For example, assume that sampling output a is connected to supply circuit a and sampling output B is connected to supply circuit B. If the feedback sub-circuit a is connected to the sampling output terminal a, the feedback sub-circuit B is connected to the sampling output terminal B, and then the feedback sub-circuit a needs to be connected to the power supply circuits a corresponding to the reference output terminal 231 and the sampling output terminal a, and the feedback sub-circuit B needs to be connected to the power supply circuits B corresponding to the reference output terminal 231 and the sampling output terminal B.
In this embodiment, each feedback sub-circuit 241 may adjust the supply voltage of the connected supply circuit 21 based on the voltages of the reference output 231 and the connected sampling output 222 as follows:
if the voltage at the sampling output 222 connected to the feedback sub-circuit 241 is smaller than the voltage at the reference output 231, the power supply circuit 21 connected to the feedback sub-circuit 241 can be controlled to increase the output of the power supply voltage. At this time, the detection voltage output from the sampling output terminal 222 to which the feedback sub-circuit 241 is connected also rises. When the detection voltage output from the sampling output terminal 222 to which the feedback sub-circuit 241 is connected is equal to the voltage of the reference output terminal 231, the control of the power supply circuit 21 is stopped.
As can be seen from the above description about the reference circuit 23, the sampling output 222 that communicates with the reference output 231 is the sampling output 222 with the maximum detection voltage, and the sampling output 222 with the maximum detection voltage corresponds to the power supply circuit 21 with the maximum power supply voltage. Therefore, this control process can be understood as adjusting the power supply voltage of the other power supply circuit 21 based on the target power supply circuit 21 having the largest power supply voltage until the power supply voltage of the other power supply circuit 21 is equal to the power supply voltage of the target power supply circuit 21. Thus, by the above adjustment, the supply voltages outputted from the respective power supply circuits 21 are equalized.
In summary, in the technical solutions according to some embodiments of the present utility model, by providing the sampling sub-circuits 22 for each power supply circuit 21 and connecting the sampling output terminal 222 outputting the maximum detection voltage to the reference output terminal 231 through the reference circuit 23, the feedback circuit 24 adjusts the power supply voltage of at least part of the power supply circuits 21 based on the voltages of the reference output terminal 231 and each sampling output terminal 222. Thus, the power supply voltages outputted from the power supply circuits 21 can be kept the same, so that the current sharing load can be realized and the load capacity can be improved.
Referring to fig. 3, a circuit diagram of a power control circuit 200 according to some embodiments of the present utility model is shown. In fig. 3, the power supply control circuit 200 is illustrated as including two power supply circuits 21. The power supply circuits 21 may include a power supply output 213 and a capacitor 2131, each power supply circuit 21 being connected to the power supply 25 via a respective power supply output 213 to supply power to the load RL 1. The capacitor 2131 and the load RL1 are connected in parallel between the power supply output terminal 213 of the power supply circuit 21 and the ground GND. The two supply circuits 21 may form two current loops as indicated by the dashed arrows, according to the principle that the positive discharge of the capacitor is equal to the negative pull-in. In each current loop, the current is equal in magnitude.
Based on the above description, the sampling circuit 221 is first explained.
In some embodiments, the sampling sub-circuit 221 includes a sensing resistor 2211 and a voltage detection circuit 2212, the sensing resistor 2211 is connected in series with the power supply circuit 21 corresponding to the sampling sub-circuit 221, and the voltage detection circuit 2212 is connected to both ends of the sensing resistor 2211 and connected to the sampling output terminal 222. In particular, the sense resistors 2211 in different sampling sub-circuits 221 may have the same resistance value. The voltage detection circuit 2212 may detect a voltage across the sensing resistor 2211. Since the sensing resistor 2211 is connected in series with the power supply circuit 21, the sensing resistor 2211 has the same magnitude of current as the corresponding power supply circuit 21. The voltage drop across each sensing resistor 2211 may reflect the current level output by each power supply circuit 21, and the current level output by the power supply circuit 21 may reflect the power supply voltage level output by the power supply circuit 21. Based on the principle analysis described above, it can be appreciated that the voltage drop across the sense resistor 2211 is proportional to the supply voltage of the supply circuit 21 to which it is connected in series. The larger the voltage drop across the sense resistor 2211, the larger the supply voltage of the supply circuit 21 connected in series therewith. By connecting the sense resistor 2211 in series with the power supply circuits 21, the magnitude of the power supply voltage of each power supply circuit 21 is phase-shifted detected, and the circuit implementation is simple.
Further, in some embodiments, the voltage detection circuit 2212 includes a first comparator U2B, U B, the first comparator 2213 includes a first positive input terminal, a second negative input terminal, and a first output terminal Q1, the first positive input terminal and the second negative input terminal are connected to two ends of the sensing resistor 2211, and the first output terminal Q1 is connected to the sampling output terminal 222. According to the working principle of the comparator, the first comparator 2213 subtracts the voltages across the sensing resistor 2211, and the obtained voltage difference is the voltage across the sensing resistor 2211. The voltage difference output by the first comparator 2213 can be used as the detection voltage output by the sampling output terminal 222.
Further, in some embodiments, in order to reduce interference signals in the detected voltage, the sampling sub-circuit 221 may further include a voltage follower 2214, where the voltage follower 2214 is connected between the first output terminal Q1 of the first comparator 2213 and the sampling output terminal 222. The voltage follower 2214 can eliminate interference signals in the detection voltage, and improve signal stability.
In summary, it can be understood that the magnitude of the detection voltage output by each sampling circuit 221 may represent the magnitude of the supply voltage of the supply circuit 21 corresponding to each sampling circuit 221. By comparing the magnitudes of the detected voltages of the respective power supply circuits 21, the magnitude relation of the power supply voltages between the power supply circuits 21 can be determined.
The reference circuit 23 is described in detail below.
Referring to fig. 2 and 3 in combination, in some embodiments, the reference circuit 23 includes a plurality of reference sub-circuits 232 in one-to-one correspondence with the sampling sub-circuits 221, the reference sub-circuits 232 being connected between the reference output terminals 231 and the sampling output terminals 222 of the corresponding sampling sub-circuits 221, the reference sub-circuits 232 being turned on when the voltage of the connected sampling output terminals 222 is higher than the voltage of the reference output terminals 231, and the reference sub-circuits 232 being turned off when the voltage of the connected sampling output terminals 222 is not higher than the voltage of the reference output terminals 231. In this way, the sampling output terminal 22 outputting the maximum detection voltage can be communicated with the reference output terminal 231. For ease of understanding, the following description is given by way of example. Assuming that the detection voltage output by the sampling output terminal a is 3 volts, the detection voltage output by the sampling output terminal B is 3.5 volts, and the voltage of the reference output terminal 231 is 3 volts in the case where the sampling output terminal a is output in communication with the reference output terminal 231. At this time, the voltage (3.5 v) of the sampling output terminal B is higher than the voltage of the reference output terminal 231, the reference sub-circuit 232 between the sampling output terminal B and the reference output terminal 231 is turned on, and the voltage of the reference output terminal 231 is adjusted to 3.5 v. At this time, the voltage of the reference output terminal 231 is higher than the voltage of the sampling output terminal a, and the reference sub-circuit 232 between the sampling output terminal a and the reference output terminal 231 is disconnected. Based on this principle, the reference circuit 23 can always communicate the sampling output terminal 22 outputting the maximum detection voltage with the reference output terminal 231.
Specifically, in some embodiments, the reference sub-circuit 232 includes a first unidirectional conduction device D1, where the first unidirectional conduction device D1 includes a first end and a second end, the first end of the first unidirectional conduction device D1 is connected to the sampling output end 222 of the corresponding sampling circuit 221, the second end of the first unidirectional conduction device D1 is connected to the reference output end 231, and when the voltage at the first end is higher than the voltage at the second end, the first unidirectional conduction device D1 is turned on. In this embodiment, the first unidirectional conduction device D1 is a diode, the first end of the first unidirectional conduction device D1 is an anode of the diode, and the second end of the first unidirectional conduction device D1 is a cathode of the diode.
The feedback sub-circuit 241 and the power supply circuit 21 are described in combination below to explain the adjustment principle of the power supply voltage.
Referring to fig. 2 and 3 in combination, in some embodiments, the feedback sub-circuit 241 includes a second comparator 2412, the second comparator 2412 includes a second forward input terminal, a second reverse input terminal, and a second output terminal Q2, the second forward output terminal is connected to the corresponding sampling output terminal 222, the second reverse input terminal is connected to the reference output terminal 231, and the second output terminal Q2 is connected to the power supply circuit 21 corresponding to the connected sampling output terminal 222. The power supply circuit 21 includes a power supply input terminal VIN, a first resistor 211 and a second resistor 212, the feedback sub-circuit 241 includes a voltage adjustment resistor 2411, the power supply input terminal VIN is used for connecting a power supply, the power supply output terminal 213 is connected with the power supply terminal 25, the first resistor 211 and the second resistor 212 are connected in series with the power supply output terminal 213 and the ground terminal GND, a connection point O of the first resistor 211 and the second resistor 212 is used for accessing an input voltage of the power supply input terminal VIN, and the voltage adjustment resistor 2411 is connected between the second output terminal Q2 and the connection point O.
For ease of understanding, one of the power supply circuits 21 and the feedback sub-circuit 241 corresponding to that power supply circuit 21 in fig. 3 are illustrated as an example. In some embodiments, the first resistor 211 may be connected in series between the power supply output terminal 213 and the second resistor 212, and the second resistor 212 may be connected in series between the first resistor 211 and the ground terminal GND. Through the above description of the reference circuit 23 and the operation principle of the second comparator 2412:
when the detected voltage at the sampling output end 222 is less than the maximum detected voltage, the second output end Q2 will output a low level, at this time, the second output end Q2 is grounded, a voltage difference is generated between the connection point O and the second output end Q2, a current passes through the voltage adjusting resistor 2411, the voltage adjusting resistor 2411 is connected in parallel with the second resistor 212, and then connected in series with the first resistor 211 between the power supply output end 213 and the ground end GND, at this time, the voltage output from the power supply output end 213 to the power supply end 25 is as shown in expression (1).
Vout1＝(1+r1/r21)*V FB (1)
Wherein Vout1 represents the voltage output from the power supply output terminal 213 to the power supply terminal 25 when the voltage adjusting resistor 2411 is connected in parallel with the second resistor 212 and then connected in series with the first resistor 211 between the power supply output terminal 213 and the ground GND;
r1 represents the resistance value of the first resistor 211;
r21 represents a parallel resistance obtained by connecting the second resistor 212 and the voltage adjusting resistor 2411 in parallel;
V FB representing the input voltage at the power input VIN connected at connection point O.
When the detected voltage at the sampling output end 222 is not less than the maximum detected voltage, the second output end Q2 will output a high level, and at this time, the second output end Q2 is at the same potential as the connection point O, no voltage difference is generated between the connection point O and the second output end Q2, no current passes through the voltage adjusting resistor 2411, which is equivalent to that the voltage adjusting resistor 2411 is not connected to the circuit between the connection point O and the ground, that is, the voltage adjusting resistor 2411 is not connected in parallel with the second resistor 212, only the second resistor 212 and the first resistor 211 are connected in series between the power supply output end 213 and the ground GND, and at this time, the voltage output from the power supply output end 213 to the power supply end 25 is as shown in expression (2).
Vout2＝(1+r1/r22)*V FB (2)
Wherein Vout2 represents the voltage output from the power supply output terminal 213 to the power supply terminal 25 when only the first resistor 211 and the second resistor 212 are connected in series between the power supply output terminal 213 and the ground GND;
r1 represents the resistance value of the first resistor 211;
r22 represents the resistance value of the second resistor 212;
V FB representing the input voltage at the power input VIN connected at connection point O.
As can be seen from comparing the above expression (1) and expression (2), vout2 is smaller than Vout1 because the resistance r22 is larger than the resistance r 21. In short, when the detected voltage at the sampling output terminal 222 is smaller than the maximum detected voltage, the voltage adjustment resistor 2411 is connected in parallel with the second resistor 212, and the supply voltage at the supply output terminal 213 increases. In this way, the power supply voltage of the other power supply circuit 21 can be adjusted based on the target power supply circuit 21 having the largest power supply voltage until the power supply voltage of the other power supply circuit 21 is equal to the power supply voltage of the target power supply circuit 21.
In some embodiments, when the power supply voltage of the power supply circuit 21 is adjusted, if only one adjustment is performed, the power supply voltage of the power supply circuit 21 may have a problem of being less stable, so that the power supply circuit 21 may output a stable power supply voltage by performing feedback adjustment for each plurality of times.
With continued reference to fig. 3, IN some embodiments, the power supply circuit 21 includes a power supply chip 214, where the power supply chip 214 includes a first chip terminal IN connected to the power supply input terminal VIN and a second chip terminal FB connected to a connection point O of the first resistor 211 and the second resistor 212. The power supply chip 214 may perform operations such as converting the voltage input by the power input terminal VIN, so that the second chip terminal FB outputs the required target voltage.
Further, it is understood that, in the plurality of power supply circuits 21, if one or more power supply circuits 21 are abnormal (such as a chip failure or a line short), the power supply voltage of the abnormal power supply circuits 21 may be 0 v (or much lower than the normal power supply voltage). In this case, the other normal power supply circuits 21 may be affected by these abnormal power supply circuits 21, resulting in a decrease in the load capacity. In view of this, in some embodiments, the power control circuit 200 may include a second unidirectional conduction device 215, where the second unidirectional conduction device 215 is connected between the power supply circuit 215 and the power supply terminal 25, and the unidirectional conduction device 215 turns off when the power supply voltage of the power supply circuit 21 is lower than the voltage of the power supply terminal 25. Thus, the abnormal power supply circuit 21 can be prevented from affecting other normal power supply circuits 21, and the reliability of the power supply control circuit 200 can be improved.
Referring to fig. 4, a block diagram of a power circuit 400 according to an embodiment of the utility model is shown. The power supply circuit 400 may include the power supply control circuit 200 described above. The beneficial effects of the power supply circuit 400 can be seen in the description related to the power supply control circuit 200, and are not repeated here.
Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope of the utility model as defined by the appended claims.
Claims (11)
1. A power control circuit, the power control circuit comprising:
a power supply terminal (25) for connecting to a load;
a plurality of power supply circuits (21) connected to the power supply terminals (25);
the sampling circuit (22) comprises a plurality of sampling sub-circuits (221), the sampling sub-circuits (221) are connected with the power supply circuits (21) in a one-to-one correspondence manner, each sampling sub-circuit (221) comprises a sampling output end (222), and the sampling sub-circuits (221) detect the power supply voltage of the connected power supply circuit (21) and output corresponding detection voltages through the sampling output ends (222);
-a reference circuit (23) comprising a reference output (231), said reference circuit (23) being connected to each of said sampling outputs (222) and communicating a sampling output (222) outputting a maximum detection voltage with said reference output (231);
-a feedback circuit (24) comprising a plurality of feedback sub-circuits (241), said feedback sub-circuits (241) being connected in one-to-one correspondence with said sampling outputs (222) and with said reference outputs (231), with power supply circuits (21) corresponding to the connected sampling outputs (222), for controlling at least part of the power supply circuits (21) to adjust the power supply voltage based on the voltages of said reference outputs (231) and of each of said sampling outputs (222).
2. The power supply control circuit according to claim 1, characterized in that the reference circuit (23) comprises a plurality of reference sub-circuits (232) corresponding one-to-one to the sampling sub-circuits (221), the reference sub-circuits (232) being connected between the reference output (231) and the sampling output (222) of the corresponding sampling sub-circuit (221), the reference sub-circuits (232) being turned on when the voltage of the connected sampling output (222) is higher than the voltage of the reference output (231).
3. The power control circuit of claim 2, wherein the reference sub-circuit (232) comprises a first unidirectional-conduction device comprising a first end and a second end, the first end of the first unidirectional-conduction device being connected to the sampling output (222) of the corresponding sampling circuit (22), the second end of the first unidirectional-conduction device being connected to the reference output (231), the first unidirectional-conduction device being turned on when the voltage at the first end is higher than the voltage at the second end.
4. The power control circuit of claim 1, wherein the sampling sub-circuit (221) comprises a sensing resistor (2211) and a voltage detection circuit (2212), the sensing resistor (2211) is connected in series with a power supply circuit (21) corresponding to the sampling sub-circuit (221), and the voltage detection circuit (2212) is connected to both ends of the sensing resistor (2211) and is connected to the sampling output terminal (222).
5. The power control circuit of claim 4, wherein the voltage detection circuit (2212) comprises a first comparator, the first comparator (2213) comprises a first forward input, a second reverse input, and a first output, the first forward input and the second reverse input are connected to two ends of the sense resistor (2211), and the first output is connected to the sampling output (222).
6. The power control circuit of claim 5, wherein the sampling sub-circuit (221) further comprises a voltage follower (2214), the voltage follower (2214) being connected between the first output of the first comparator (2213) and the sampling output (222).
7. The power control circuit of claim 1, wherein the feedback sub-circuit (241) comprises a second comparator (2412), the second comparator (2412) comprising a second forward input, a second reverse input, and a second output, the second forward output being coupled to the corresponding sampling output (222), the second reverse input being coupled to the reference output (231), the second output being coupled to the power supply circuit (21) corresponding to the coupled sampling output (222).
8. The power supply control circuit of claim 7, wherein the power supply circuit (21) includes a power supply input terminal, a power supply output terminal (213), a first resistor (211), and a second resistor (212), the feedback sub-circuit (241) includes a voltage adjustment resistor (2411), the power supply input terminal is used for connecting a power supply, the power supply output terminal (213) is connected with the power supply terminal (25), the first resistor (211) and the second resistor (212) are connected in series with the power supply output terminal (213) and a ground terminal, a connection point of the first resistor (211) and the second resistor (212) is used for connecting an input voltage of the power supply input terminal, and the voltage adjustment resistor (2411) is connected between the second output terminal and the connection point.
9. The power supply control circuit of claim 8, wherein the power supply circuit (21) comprises a power supply chip (214), the power supply chip (214) comprising a first chip terminal and a second chip terminal, the first chip terminal being connected to the power supply input terminal, the second chip terminal being connected to a connection point of the first resistor (211) and the second resistor (212).
10. The power supply control circuit according to claim 1, characterized in that the power supply control circuit comprises a second unidirectional conducting device (215), the second unidirectional conducting device (215) being connected between the power supply circuit (21) and a power supply terminal (25), the unidirectional conducting device being turned off when the power supply voltage of the power supply circuit (21) is lower than the voltage of the power supply terminal (25).
11. A power supply circuit, characterized in that it comprises a power supply control circuit as claimed in any one of claims 1 to 10.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321300065.9U CN219960389U (en) | 2023-05-23 | 2023-05-23 | Power supply control circuit and power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321300065.9U CN219960389U (en) | 2023-05-23 | 2023-05-23 | Power supply control circuit and power supply circuit |
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| Publication Number | Publication Date |
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| CN219960389U true CN219960389U (en) | 2023-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321300065.9U Active CN219960389U (en) | 2023-05-23 | 2023-05-23 | Power supply control circuit and power supply circuit |
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| Country | Link |
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| CN (1) | CN219960389U (en) |
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