CN210016406U - Control system and power supply system - Google Patents
Control system and power supply system Download PDFInfo
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- CN210016406U CN210016406U CN201921218014.5U CN201921218014U CN210016406U CN 210016406 U CN210016406 U CN 210016406U CN 201921218014 U CN201921218014 U CN 201921218014U CN 210016406 U CN210016406 U CN 210016406U
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Abstract
The application provides a control system and power supply system, wherein, this control system includes: the device comprises a push-pull module, a sampling module, a voltage division module, a comparator and an isolating device; the sampling module is connected with the output end of the push-pull module and is used for collecting the output voltage of the push-pull module; the first input end of the comparator is connected with the sampling module, and the second input end of the comparator is connected with the voltage dividing module; the output end of the comparator is connected with the isolating device, the isolating device is connected with the switch of the push-pull module, when the push-pull module is in a standby state and the voltage of the sampling module is greater than the voltage of the voltage dividing module, the output end of the comparator is cut off, so that the isolating device is not conducted, the switch of the push-pull module is turned off and conducted, and the push-pull module is stopped.
Description
Technical Field
The application relates to the technical field of power supply control, in particular to a control system and a power supply system.
Background
In power supply products, especially in low-voltage and high-current occasions, the push-pull circuit is widely used due to the characteristics of high efficiency, simple structure, high utilization rate of a magnetic core of a switching transformer and the like. In the existing push-pull circuit, the push-pull chip has a characteristic in the working process, namely the starting time is long when the push-pull chip is normally started; however, if the push-pull circuit is continuously operated, there is a certain loss and the like.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a control system and a power supply system. The effect of reducing the loss of the push-pull circuit can be achieved.
In a first aspect, an embodiment of the present application provides a control system, including: the device comprises a push-pull module, a sampling module, a voltage division module, a comparator and an isolating device;
the sampling module is connected with the output end of the push-pull module and is used for collecting the output voltage of the push-pull module;
the first input end of the comparator is connected with the sampling module, and the second input end of the comparator is connected with the voltage dividing module;
the output end of the comparator is connected with the isolating device, and the isolating device is connected with the switch of the push-pull module;
when the push-pull module is in a standby state and the voltage of the sampling module is greater than the voltage of the voltage dividing module, the output end of the comparator is cut off, so that the isolating device is not conducted, the switch of the push-pull module is turned off and conducted, and the push-pull module is stopped.
The control system that this application embodiment provided, through foretell sampling module, partial pressure module, comparator and isolator's cooperation, when making control system get into standby state back can reduce control system's self-loss, improve output response speed, when reaching energy-conserving purpose, still compromise the excellence of equipment performance.
With reference to the first aspect, a first possible implementation manner of the first method is provided, where the sampling module includes a first resistor and a second resistor;
one end of the first resistor is connected with the output end of the push-pull module;
the other end of the first resistor is connected with one end of the second resistor, and the other end of the second resistor is grounded;
and the connection point of the first resistor and the second resistor is connected with the first input end of the comparator.
According to the control system provided by the embodiment of the application, the sampling module is formed by combining the first resistor and the second resistor, and the voltage of the push-pull module is sampled by using a simple structure.
With reference to the first implementation manner of the first aspect, an embodiment of the present application provides a second possible implementation manner of the first method, and further includes: a time adjustment module connected between the sampling module and the first input of the comparator.
The control system provided by the embodiment of the application can also be provided with the time adjusting module, the response time can be adjusted by the time adjusting module, and the starting and closing frequency of the push-pull module is reduced, so that the stability of the control system can be improved.
With reference to the second implementation manner of the first aspect, this application provides a third possible implementation manner of the first method, where the time adjustment module includes a third resistor and a first capacitor;
one end of the third resistor is connected to the connection point of the first resistor and the second resistor;
the other end of the third resistor is connected with one end of the first capacitor, and the other end of the first capacitor is grounded;
and the connection point of the third resistor and the first capacitor is connected with the first input end of the comparator.
According to the control system provided by the embodiment of the application, the response time can be adjusted through the cooperation of the third resistor and the first capacitor in the time adjusting module.
With reference to the first aspect, an embodiment of the present application provides a fourth possible implementation manner of the first method, where the voltage dividing module includes a fourth resistor and a fifth resistor;
one end of the fourth resistor is connected with a power supply;
the other end of the fourth resistor is connected with one end of the fifth resistor, and the other end of the fifth resistor is grounded;
and the connection point of the fourth resistor and the fifth resistor is connected with the second input end of the comparator.
In the control system provided by the embodiment of the application, the voltage dividing module may include a fourth resistor and a fifth resistor, and a voltage between the fourth resistor and the fifth resistor is used as a reference voltage.
With reference to the first aspect, an embodiment of the present application provides a fifth possible implementation manner of the first method, further including:
one end of the sixth resistor is connected with the first input port of the isolation device, and the other end of the sixth resistor is connected with a power supply.
The control system that this application embodiment provided plays the current-limiting effect to the isolating device through setting up the sixth resistance to play the guard action to the isolating device.
With reference to the first aspect, an embodiment of the present application provides a sixth possible implementation manner of the first method, where the push-pull module includes a controller, a ninth resistor, a first switch, a push-pull chip, a driving circuit, a push-pull circuit, and a rectifier bridge;
the controller is connected with the ninth resistor;
the ninth resistor is connected with the base electrode of the first switch;
the emitter of the first switch is grounded, and the collector of the first switch is connected with the push-pull chip;
the second input port of the isolation device is connected with the output end of the comparator, and the first output end of the isolation device is connected at the connecting point of the first switch and the ninth resistor;
the push-pull chip is connected with the driving circuit;
the driving circuit is connected with the push-pull circuit;
the push-pull circuit is connected with the rectifier bridge;
and the output end of the rectifier bridge is used as the output end of the push-pull module and is connected with the sampling module.
The control system provided by the embodiment of the application can realize the conduction of the first switch through the conduction of the isolation device, so that the closing (Shutdown) pin of the push-pull chip can be further set to be a low level, and the push-pull chip can output a PWM (Pulse width modulation) signal.
With reference to the sixth implementation manner of the first aspect, an embodiment of the present application provides a seventh possible implementation manner of the first method, and further includes: an eighth resistor;
one end of the eighth resistor is connected with the second output port of the isolation device, and the other end of the eighth resistor is connected with a power supply.
The control system that this application embodiment provided plays the current-limiting effect to the isolating device through setting up eighth resistance to play the guard action to the isolating device.
With reference to the seventh implementation manner of the first aspect, this application provides an eighth possible implementation manner of the first method, and the push-pull module further includes a seventh resistor, where one end of the seventh resistor is connected to the collector of the first switch, and the other end of the seventh resistor is connected to a power supply.
The control system provided by the embodiment of the application can better protect the control system by matching with the seventh resistor and the eighth resistor.
In a second aspect, an embodiment of the present application provides a power supply system, including:
a power supply;
the first aspect connected to the power supply, or any one of possible implementations of the first aspect, provides a control system, where the control system is configured to control turning on or off of the power supply.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic block structure diagram of a control system according to an embodiment of the present disclosure.
Fig. 2 is a circuit diagram of a control system according to an embodiment of the present application.
Fig. 3 is a functional block diagram of a power supply system according to an embodiment of the present application.
Icon: 10-a control system; 110-a push-pull module; 111-push-pull chip; 112-a driver circuit; 113-push-pull circuit; 114-a rectifier bridge; 115-a controller; 120-a sampling module; 130-a voltage division module; 140-an isolation device; U1A-comparator; r1 — first resistance; r2 — second resistance; r3 — third resistance; r4-fourth resistor; r5-fifth resistor; r6-sixth resistance; r7 — seventh resistor; r8 — eighth resistance; r9 — ninth resistor; c1 — first capacitance; q1 — first switch; 20-power supply.
Detailed Description
The technical solution in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
In power supply products, especially in low-voltage and high-current occasions, the push-pull circuit is widely used due to the characteristics of high efficiency, simple structure, high utilization rate of a magnetic core of a switching transformer and the like. In the existing push-pull circuit, the push-pull chip has a characteristic in the working process, namely, the push-pull chip has a soft start function during normal start, the start time is long, the push-pull circuit has certain loss and the like during continuous working, and the main loss is the loss of a switching device, the loss of a transformer and the like. If the push-pull circuit is in a standby state, the push-pull chip has no output, and the switching device does not work, so that the standby loss of the whole equipment can be reduced, but when the output needs to be started again, the push-pull circuit needs to be started to charge the capacitor at the output side, so that the response speed of the whole equipment is slower; if the push-pull circuit does not enter the standby state but continues to output, the standby loss of the entire device is high.
Therefore, one way of operating the push-pull circuit is to disable the push-pull circuit output in response to a need, and then to enable the push-pull circuit when the push-pull circuit output is needed. Another way of operating the push-pull circuit is to keep the push-pull circuit outputting continuously. If a certain voltage is always kept on the output side of the push-pull circuit during the standby process, and the output of the push-pull chip is intermittently turned off, the standby loss can be reduced to a certain extent, but the above operation modes still have large loss during the standby process.
Based on this, the embodiment of the application provides a control system and a power supply system, the condition of the output voltage of the push-pull module is detected through some circuit structures added in the control system, and the start-stop control of the push-pull module is performed according to the voltage requirement, so that the aim of reducing standby loss while keeping the voltage on the output side is achieved by matching the management of a power circuit, but the voltage on the output side is lower than the normal output voltage. The control system provided by the embodiment of the present application is described in detail by several embodiments.
Example one
As shown in fig. 1, a control system 10 provided in the embodiment of the present application includes: push-pull module 110, sampling module 120, voltage dividing module 130, comparator U1A, and isolation device 140.
The sampling module 120 is connected to an output end of the push-pull module 110, and is configured to collect an output voltage of the push-pull module 110.
A first input of the comparator U1A is connected to the sampling module 120 and a second input of the comparator U1A is connected to the voltage divider module 130.
Alternatively, the first input terminal may be a non-inverting input terminal or an inverting input terminal.
For example, when the first input terminal is a non-inverting input terminal, the corresponding second input terminal is an inverting input terminal; when the first input terminal is an inverting input terminal, the corresponding second input terminal is a non-inverting input terminal.
The output of the comparator U1A is connected to the isolation device 140, and the isolation device 140 is connected to the switch of the push-pull module 110.
Illustratively, when the voltage of the sampling module 120 is lower than the voltage of the voltage dividing module 130 when the push-pull module 110 is in the standby state, the output terminal of the comparator U1A is set to be low, so that the isolation device 140 is turned on, and the push-pull module 110 is activated.
Illustratively, when the push-pull module 110 is in a standby state, when the voltage of the sampling module 120 is greater than the voltage of the voltage dividing module 130, the output terminal of the comparator U1A is turned off, so that the isolation device 140 is turned off and the switch of the push-pull module 110 is turned off and on, and the push-pull module 110 is stopped.
The voltage of the sampling module 120 is used as the output voltage of the push-pull module 110, and the voltage of the voltage dividing module 130 is used as the reference voltage.
Through the cooperation of the sampling module 120, the voltage dividing module 130, the comparator U1A and the isolation device 140, the self-loss of the control system 10 can be reduced after the control system 10 enters the standby state, the output response speed is increased, the energy-saving purpose is achieved, and the different performance of the device is also considered.
Alternatively, the isolation device 140 may be any device that can achieve isolation, such as an optical coupler, a magnetic coupler, or the like.
Optionally, the isolation device 140 may also be a transistor, which implements the signal transformation process.
In an alternative embodiment, as shown in fig. 2, the sampling module 120 may include a first resistor R1 and a second resistor R2.
One end of the first resistor R1 is connected to the output end of the push-pull module 110. One end of the second resistor R2 is connected to the other end of the first resistor R1, and the other end of the second resistor R2 is grounded.
The junction of the first resistor R1 and the second resistor R2 is connected to the first input terminal of the comparator U1A.
Alternatively, the first input terminal may be a non-inverting input terminal or an inverting input terminal. In fig. 2, the first input terminal is a non-inverting input terminal, and the second input terminal is an inverting input terminal.
The comparator U1A can compare the voltage between the first resistor R1 and the second resistor R2 with the voltage of the voltage dividing module 130, and when the voltage between the first resistor R1 and the second resistor R2 is greater than the voltage of the voltage dividing module 130, the output of the comparator U1A is turned off, the isolating device 140 is not turned on, and the switch of the push-pull module 110 is also not turned on, so the push-pull module 110 is not activated. When the voltage between the first resistor R1 and the second resistor R2 is lower than the voltage of the voltage divider module 130, the output terminal of the comparator U1A is set low, the isolation device 140 is turned on, the switch of the push-pull module 110 is also turned on, and thus the push-pull module 110 is turned on.
Optionally, the control system 10 of the present embodiment may further include: a time adjustment module connected between the sampling module 120 and a first input of the comparator U1A.
In one embodiment, as shown in fig. 2, the time adjustment module may include a third resistor R3 and a first capacitor C1.
One end of the third resistor R3 is connected to the connection point of the first resistor R1 and the second resistor R2.
The other end of the third resistor R3 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded.
The junction of the third resistor R3 and the first capacitor C1 is connected to the first input terminal of the comparator U1A.
In the time adjustment module in this embodiment, the response time can be adjusted by setting the values of the third resistor R3 and the first capacitor C1, for example, when the value of the first capacitor C1 is larger and the value of the third resistor R3 is also larger, the set output voltage of the push-pull module 110 is U, and then the comparator U1A performs a series of operations such as comparison after the actual output is smaller than a certain value of U.
Optionally, the voltage dividing module 130 may include a fourth resistor R4 and a fifth resistor R5.
Illustratively, one end of the fourth resistor R4 is connected to a power supply, the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is grounded. The junction of the fourth resistor R4 and the fifth resistor R5 is connected to the second input of the comparator U1A.
Illustratively, the voltage between the first resistor R1 and the second resistor R2 is used as the output voltage of the push-pull module 110, the voltage at the connection point of the fourth resistor R4 and the fifth resistor R5 is used as a reference voltage, and the comparator U1A can compare the output voltage with the reference voltage, when the output voltage is less than the reference voltage, the output terminal of the comparator U1A is set low, the isolation device 140 is turned on, the switch of the push-pull module 110 is also turned on, and therefore, the push-pull module 110 is turned on.
For example, the voltage adjusted by the time adjustment module may be used as the output voltage, that is, the voltage at the connection point of the third resistor R3 and the first capacitor C1 is used as the output voltage Vh, the voltage at the connection point of the fourth resistor R4 and the fifth resistor R5 is used as the reference voltage Vr, the comparator U1A compares the magnitudes of Vh and Vr, when Vh is smaller than Vr, the output terminal of the comparator U1A is lowered, the isolation device 140 is turned on, the switch of the push-pull module 110 is also turned on, and thus the push-pull module 110 is started.
Alternatively, the first input terminal may be an inverting input terminal and the second input terminal may be a non-inverting input terminal. On this basis, the structure shown in fig. 2 can be adaptively changed to achieve a similar effect.
Illustratively, a variation device may be added between the push-pull chip and the comparator, and the variation device may include a logic gate or a PNP transistor or a mos (metal oxide semiconductor) transistor, etc.
As shown in fig. 2, the control system 10 provided in the present embodiment may further include: one end of the sixth resistor R6, the sixth resistor R6 is connected to the first input port of the isolation device 140, and the other end of the sixth resistor R6 is connected to a power supply.
Illustratively, as shown in fig. 2, the push-pull module 110 may include a controller 115, a ninth resistor R9, a first switch Q1, a push-pull chip 111, a driving circuit 112, a push-pull circuit 113, and a rectifier bridge 114.
The first switch Q1 may be a transistor. For example, it may be an NPN type transistor.
Alternatively, the controller 115 may be an MCU (Micro Control Unit, Chinese called Micro Control Unit).
Alternatively, the push-pull chip 111 may be a 3525 chip or a 2525 chip.
The controller 115 is connected to a ninth resistor R9, and the ninth resistor R9 is connected to the base of the first switch Q1. The emitter of the first switch Q1 is grounded, and the collector of the first switch Q1 is connected to the push-pull chip 111.
A second input port of the isolation device 140 is connected to the output of the comparator U1A, and a first output port of the isolation device 140 is connected to the connection point of the first switch Q1 and the ninth resistor R9.
The push-pull chip 111 is connected with the driving circuit 112, the driving circuit 112 is connected with the push-pull circuit 113, the push-pull circuit 113 is connected with the rectifier bridge 114, and the output end of the rectifier bridge 114 is connected with the sampling module 120 as the output end of the push-pull module 110.
Illustratively, when the push-pull module 110 is in a normal non-standby operation state, the controller 115 sends out a control signal, and the control signal is at a high level, so that the Shutdown pin of the push-pull chip 111 is at a low level, so that the push-pull chip 111 outputs a PWM signal.
Illustratively, when the push-pull module 110 is in a standby state, the controller 115 sends out a control signal, and the control signal is at a low level, then the start or stop of the push-pull chip 111 can be controlled by the output voltage of the push-pull module 110. And when the output voltage is lower than the set value, starting the PWM signal output of the push-pull chip 111, and when the output voltage is higher than the set value, stopping the PWM signal output of the push-pull chip 111.
When the push-pull module 110 is in standby, the output end of the push-pull module 110 always keeps a certain voltage, so that the purpose of improving dynamic response is achieved; when the output voltage exceeds a set value, the push-pull chip 111 can close the PWM signal output, i.e. the purpose of reducing the loss of the push-pull module 110 in the standby process is achieved.
Illustratively, referring again to fig. 2, the control system 10 may further include an eighth resistor R8. One end of the eighth resistor R8 is connected to the second output port of the isolation device 140, and the other end of the eighth resistor R8 is connected to a power supply.
For example, referring to fig. 2 again, the push-pull module 110 further includes a seventh resistor R7, one end of the seventh resistor R7 is connected to the collector of the first switch Q1, and the other end of the seventh resistor R7 is connected to a power supply.
When the push-pull module 110 is in a standby state, the more the set output voltage value is lower than the voltage value of the normal output side, the more the standby loss can be reduced; the closer the set output voltage value is to the normal output side voltage value, the better the dynamic response will be when startup is required. Therefore, in specific use, the output voltage value of the push-pull module 110 can be set according to the actual response requirement and the loss requirement.
In the control system 10 in this embodiment, by adding the sampling module 120, the voltage dividing module 130, the comparator U1A, and the isolating device 140, the push-pull module 110 can reduce the self-loss of the push-pull module 110 after entering the standby state, and at the same time, the voltage at the output end of the push-pull module 110 can be automatically started when being increased to a certain value, so as to increase the output response speed, that is, achieve the purpose of saving energy, and take into account the different properties of the device performance.
Example two
An embodiment of the present application provides a power supply system, as shown in fig. 3, the power supply system may include: the power supply system comprises a power supply 20 and a control system 10 connected with the power supply 20, wherein the control system 10 is used for controlling the power supply 20 to be switched on or switched off.
The control system 10 of the present embodiment may be the control system 10 provided in the first embodiment.
The foregoing is illustrative of only alternative embodiments of the present application and is not intended to limit the present application, which may be modified or varied by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A control system, comprising: the device comprises a push-pull module, a sampling module, a voltage division module, a comparator and an isolating device;
the sampling module is connected with the output end of the push-pull module and is used for collecting the output voltage of the push-pull module;
the first input end of the comparator is connected with the sampling module, and the second input end of the comparator is connected with the voltage dividing module;
the output end of the comparator is connected with the isolating device, and the isolating device is connected with the switch of the push-pull module;
when the push-pull module is in a standby state and the voltage of the sampling module is greater than the voltage of the voltage dividing module, the output end of the comparator is cut off, so that the isolating device is not conducted, the switch of the push-pull module is turned off and conducted, and the push-pull module is stopped.
2. The control system of claim 1, wherein the sampling module comprises a first resistor and a second resistor;
one end of the first resistor is connected with the output end of the push-pull module;
the other end of the first resistor is connected with one end of the second resistor, and the other end of the second resistor is grounded;
and the connection point of the first resistor and the second resistor is connected with the first input end of the comparator.
3. The control system of claim 2, further comprising: a time adjustment module connected between the sampling module and the first input of the comparator.
4. The control system of claim 3, wherein the time adjustment module comprises a third resistor and a first capacitor;
one end of the third resistor is connected to the connection point of the first resistor and the second resistor;
the other end of the third resistor is connected with one end of the first capacitor, and the other end of the first capacitor is grounded;
and the connection point of the third resistor and the first capacitor is connected with the first input end of the comparator.
5. The control system of claim 1, wherein the voltage divider module comprises a fourth resistor and a fifth resistor;
one end of the fourth resistor is connected with a power supply;
the other end of the fourth resistor is connected with one end of the fifth resistor, and the other end of the fifth resistor is grounded;
and the connection point of the fourth resistor and the fifth resistor is connected with the second input end of the comparator.
6. The control system of claim 1, wherein the push-pull module comprises a controller, a ninth resistor, a first switch, a push-pull chip, a driving circuit, a push-pull circuit, and a rectifier bridge;
the controller is connected with the ninth resistor;
the ninth resistor is connected with the base electrode of the first switch;
the emitter of the first switch is grounded, and the collector of the first switch is connected with the push-pull chip;
the second input port of the isolation device is connected with the output end of the comparator, and the first output end of the isolation device is connected at the connecting point of the first switch and the ninth resistor;
the push-pull chip is connected with the driving circuit;
the driving circuit is connected with the push-pull circuit;
the push-pull circuit is connected with the rectifier bridge;
and the output end of the rectifier bridge is used as the output end of the push-pull module and is connected with the sampling module.
7. The control system of claim 6, wherein the push-pull module further comprises a seventh resistor, one end of the seventh resistor is connected to the collector of the first switch, and the other end of the seventh resistor is connected to a power supply.
8. The control system of claim 1, further comprising:
one end of the sixth resistor is connected with the first input port of the isolation device, and the other end of the sixth resistor is connected with a power supply.
9. The control system of claim 1, further comprising: an eighth resistor;
one end of the eighth resistor is connected with the second output port of the isolation device, and the other end of the eighth resistor is connected with a power supply.
10. A power supply system, comprising:
a power supply;
the control system of any one of claims 1-9 connected to the power supply, the control system configured to control the power supply to be turned on or off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921218014.5U CN210016406U (en) | 2019-07-29 | 2019-07-29 | Control system and power supply system |
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| CN201921218014.5U CN210016406U (en) | 2019-07-29 | 2019-07-29 | Control system and power supply system |
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| CN210016406U true CN210016406U (en) | 2020-02-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289769A (en) * | 2019-07-29 | 2019-09-27 | 惠州汇能精电科技有限公司 | Control system and power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289769A (en) * | 2019-07-29 | 2019-09-27 | 惠州汇能精电科技有限公司 | Control system and power supply system |
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