CN212259387U - Constant power control circuit and driving system - Google Patents
Constant power control circuit and driving system Download PDFInfo
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- CN212259387U CN212259387U CN202021343293.0U CN202021343293U CN212259387U CN 212259387 U CN212259387 U CN 212259387U CN 202021343293 U CN202021343293 U CN 202021343293U CN 212259387 U CN212259387 U CN 212259387U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The application provides a constant power control circuit and a driving system, and relates to the technical field of driving power supplies. The constant power control circuit comprises a voltage sampling module, a constant power conversion module, a current sampling module and a current comparison module, wherein the voltage sampling module and the current sampling module are respectively and electrically connected with a power supply main circuit, the power supply main circuit is also used for connecting a load, the constant power conversion module is respectively and electrically connected with the current comparison module and the voltage sampling module, the current comparison module is electrically connected with the current sampling module, and the current comparison module is also used for connecting a main power output module. The application provides a constant power control circuit and actuating system has promoted the operating efficiency, has realized self-adaptation power compensation, and is difficult to appear the overpower phenomenon, has protected the advantage of lamp pearl.
Description
Technical Field
The application relates to the technical field of driving power supplies, in particular to a constant power control circuit and a driving system.
Background
Because of its characteristics of high efficiency, long life, environmental protection, etc., LEDs (Light Emitting diodes) are widely used in the fields of illumination, display screens, backlight, etc., and among them, the application of illumination is the most extensive. And the stability and reliability of the LED illuminating lamp depend on the quality of power supply to a great extent. The driving power source is a converter that converts a power supply into a specific electric energy to drive the LEDs to emit light. It can be seen that the quality of the driving power is a key factor for determining the quality of the LED lighting.
In order to drive the LED to emit light better, a constant power technology is generally adopted to drive the LED, that is, the driving power of the LED is ensured to be constant as much as possible. According to the traditional constant power design technology, the output voltage value is artificially tested, the output current is calculated according to the power, and then the corresponding output current value is artificially adjusted, so that the production efficiency and the use convenience of customers are seriously influenced. Moreover, due to manual operation, the over-power phenomenon is easily caused, and the lamp beads are damaged.
To sum up, there is the production efficiency low in present constant power technique, easily appears the overpower phenomenon and leads to the problem that the lamp pearl damaged.
SUMMERY OF THE UTILITY MODEL
An object of the application is to provide a constant power control circuit and actuating system to solve the production efficiency that current constant power technique exists and hang down, the easy overpower phenomenon that appears leads to the lamp pearl to damage the problem.
In order to achieve the above purpose, the embodiments of the present application employ the following technical solutions:
on one hand, the embodiment of the application provides a constant power control circuit, which comprises a voltage sampling module, a constant power conversion module, a current sampling module and a current comparison module;
the voltage sampling module and the current sampling module are respectively and electrically connected with a power supply main circuit, the power supply main circuit is also used for connecting a load, the constant power conversion module is respectively and electrically connected with the current comparison module and the voltage sampling module, the current comparison module is electrically connected with the current sampling module, and the current comparison module is also used for connecting a main power output module; wherein the content of the first and second substances,
the main power output module is used for supplying power to the load through the power supply main circuit;
the voltage sampling module is used for collecting a voltage value of the power supply main circuit and transmitting the voltage value to the constant power conversion module;
the constant power conversion module is used for determining a target current value according to a preset target power value and the voltage value and transmitting the target current value to the current comparison module;
the current sampling module is used for collecting the current value of the main power supply circuit and transmitting the current value to the current comparison module;
the current comparison module is used for generating an adjusting signal according to the current value and the target current value and transmitting the adjusting signal to the main power output module;
the main power output module is further configured to adjust an output current according to the adjustment signal, so that the output power of the main power supply circuit is constant.
Further, the voltage sampling module includes a first isolation unit, a voltage sampling component, a first comparator and a reference voltage generating unit, the voltage sampling component is respectively electrically connected to the main power supply circuit and a first input port of the first comparator, the reference voltage generating unit is electrically connected to a second input port of the first comparator, an output port of the first comparator is electrically connected to the first isolation unit, and the first isolation unit is further electrically connected to the constant power conversion module; wherein the content of the first and second substances,
the first comparator is used for acquiring a current voltage value transmitted by the voltage sampling component and a reference voltage value transmitted by the reference voltage generating unit and generating a first PWM signal according to the current voltage value and the reference voltage value;
the first isolation unit is used for transmitting the first PWM signal to the constant power conversion module, so that the constant power conversion module determines a target current value according to the first PWM signal and a preset target power value.
Further, the voltage sampling component includes a first resistor and a second resistor, one end of the first resistor is electrically connected to the power supply main circuit, the other end of the first resistor is electrically connected to the first input port of the first comparator and one end of the second resistor, respectively, and the other end of the second resistor is grounded.
Further, the reference voltage generating unit is configured to generate a triangular wave signal, the first comparator is configured to generate a positive pulse signal when the current voltage value is greater than or equal to the reference voltage value, and the first comparator is further configured to generate a negative pulse signal when the current voltage value is less than the reference voltage value.
Further, the first isolation unit includes an optocoupler.
Further, the constant power control circuit further comprises a second isolation unit and a current reference module, and the constant power conversion module, the second isolation unit, the current reference module and the current comparison module are electrically connected in sequence;
the constant power conversion module is used for outputting a second PWM signal and transmitting the second PWM signal to the current reference module through the second isolation unit;
the current reference module is used for converting the second PWM signal into a direct current signal and transmitting the direct current signal to the current comparison module.
Furthermore, the current reference module comprises a third resistor, a fourth resistor, a first capacitor, a fifth resistor, a sixth resistor and a second capacitor, wherein one end of the third resistor, the fourth resistor and the first capacitor after being connected in parallel is grounded, the other end of the third resistor, the fourth resistor and the first capacitor after being connected in parallel is respectively electrically connected with one end of the current comparison module and one end of the fifth resistor, the other end of the fifth resistor is electrically connected with the second isolation unit, one end of the sixth resistor is electrically connected with the second isolation unit, the other end of the sixth resistor is respectively connected with a power supply and the second capacitor, and the second capacitor is also grounded.
Further, the current comparison module includes a second comparator and a feedback network, a positive input end of the second comparator is electrically connected to the constant power conversion module, a negative input end of the second comparator is electrically connected to the current sampling module, and the feedback network is respectively connected to an output end and a negative input end of the second comparator.
Further, the current sampling module comprises a current sampling resistor, one end of the current sampling resistor is electrically connected with the power supply main circuit, and the other end of the current sampling resistor is electrically connected with the current comparison module.
On the other hand, the embodiment of the present application further provides a driving system, which includes a power supply main circuit, a main power output module, and the above-mentioned constant power control circuit, wherein,
the power supply main circuit is respectively and electrically connected with the main power output module, the voltage sampling module and the current sampling module, the power supply main circuit is also used for connecting a load, the constant power conversion module is respectively and electrically connected with the current comparison module and the voltage sampling module, and the current comparison module is also respectively and electrically connected with the current sampling module and the main power output module;
the main power output module is used for supplying power to the load through the power supply main circuit;
the voltage sampling module is used for collecting a voltage value of the power supply main circuit and transmitting the voltage value to the constant power conversion module;
the constant power conversion module is used for determining a target current value according to a preset target power value and the voltage value and transmitting the target current value to the current comparison module;
the current sampling module is used for collecting the current value of the main power supply circuit and transmitting the current value to the current comparison module;
the current comparison module is used for generating an adjusting signal according to the current value and the target current value and transmitting the adjusting signal to the main power output module;
the main power output module is further configured to adjust an output current according to the adjustment signal, so that the output power of the main power supply circuit is constant.
Compared with the prior art, the embodiment of the application has the following beneficial effects:
the application provides a constant power control circuit and a driving system, wherein the constant power control circuit comprises a voltage sampling module, a constant power conversion module, a current sampling module and a current comparison module, wherein the voltage sampling module and the current sampling module are respectively and electrically connected with a power supply main circuit, the power supply main circuit is also used for connecting a load, the constant power conversion module is respectively and electrically connected with the current comparison module and the voltage sampling module, the current comparison module is electrically connected with the current sampling module, and the current comparison module is also used for connecting a main power output module; the main power output module is used for supplying power to a load through a power supply main circuit; the voltage sampling module is used for collecting a voltage value of the power supply main circuit and transmitting the voltage value to the constant power conversion module; the constant power conversion module is used for determining a target current value according to a preset target power value and a preset voltage value and transmitting the target current value to the current comparison module; the current sampling module is used for collecting the current value of the power supply main circuit and transmitting the current value to the current comparison module; the current comparison module is used for generating an adjusting signal according to the current value and the target current value and transmitting the adjusting signal to the main power output module; the main power output module is also used for adjusting the output current according to the adjusting signal so as to enable the output power of the power supply main circuit to be constant. According to the constant power output circuit, the current and the voltage of the power supply main circuit can be respectively sampled through the current sampling module and the voltage sampling module, the target current value corresponding to the current voltage is determined through the constant power conversion module, then the adjusted signal is generated through comparison of the target current value and the current value, and therefore the main power output module can adjust the output current according to the adjusted signal, the output current value is equal to the target current value, and constant power output is achieved. Because this process is not artifical the intervention, consequently promoted efficiency, be difficult to appear overpower phenomenon simultaneously, consequently protected the lamp pearl.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred 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 it will be apparent to those skilled in the art that other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a block diagram of a constant power control circuit according to an embodiment of the present disclosure.
Fig. 2 is a block diagram of another constant power control circuit according to an embodiment of the present disclosure.
Fig. 3 is a circuit diagram of a constant power control circuit according to an embodiment of the present disclosure.
In the figure: 100-constant power control circuit; 110-a voltage sampling module; 120-constant power conversion module; 130-a current sampling module; 140-a current comparison module; 150-a second isolation unit; 160-current reference module; r1 — first resistance; r2 — second resistance; r3 — third resistance; r4-fourth resistor; r5-fifth resistor; r6-sixth resistance; c1 — first capacitance; c2-second capacitance.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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. 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.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally found in use of products of the application, and are used only for convenience in describing the present application and for simplification of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
First embodiment
As described in the background, the quality of the driving power is currently a key factor in determining the quality of the LED lighting. However, the LED lighting fixtures are various and limited by the structure, heat dissipation, and bead types, and the bead strings and parallel connection modes of each manufacturer are different. Therefore, the lamps with the same power have various voltage and current specifications, and bring about no small challenge to the compatible design of the driving power supply.
In the conventional constant power design technology, the output voltage value is mainly tested artificially, the output current is calculated according to the power, and then the corresponding output current value is adjusted artificially, so that the production efficiency and the use convenience of a user are seriously influenced. Moreover, due to manual operation, the over-power phenomenon is easily caused, and the lamp beads are damaged.
In view of this, the present application provides a constant power control circuit, which automatically obtains a current value and a current voltage value of a main power supply circuit through the constant power control circuit, so as to determine a target current value, and enable a main power output module to adjust according to the target current value.
The following is an exemplary description of the constant power control circuit provided in the present application:
as an optional implementation manner, please refer to fig. 1, the constant power control circuit 100 provided in the present application includes a voltage sampling module 110, a constant power conversion module 120, a current sampling module 130, and a current comparison module 140, wherein the voltage sampling module 110 and the current sampling module 130 are respectively electrically connected to a main power supply circuit, the main power supply circuit is further configured to be connected to a load, the constant power conversion module 120 is respectively electrically connected to the current comparison module 140 and the voltage sampling module 110, the current comparison module 140 is electrically connected to the current sampling module 130, and the current comparison module 140 is further configured to be connected to a main power output module.
In this application, main power output module is power module, and it can be for the load power supply through the main road of supplying power, and as an implementation, the load can be the LED light. When the main power output module normally supplies power for the load, if the load changes, or when the ambient temperature changes, resulting in the pressure drop of the LED lamp bead changing, the constant power control circuit 100 provided by the application can realize the constant power output of the main power output module, so that the LED lamp bead can work more stably.
For example, when a load voltage is fixed, the power is adjusted to the set power, if the load varies at the moment, such as the 56V load is changed to 42V, the output power is reduced from 200W to 150W, no adaptive constant power effect is caused, and manual intervention is needed if the power is adjusted to 200W, such as by adjusting an external potentiometer and the like. The constant power control circuit 100 provided in the present application can automatically adjust the output current according to the output voltage, so as to achieve the purpose of constant power.
The voltage sampling module 110 can collect a current voltage value of the main power supply circuit and transmit the voltage value to the constant power conversion module 120, and after receiving the current voltage value, the constant power conversion module 120 determines a target current value according to a preset target power value and the voltage value, and transmits the target current value to the current comparison module 140.
As an implementation manner, the main power supply circuit includes a positive terminal and a negative terminal, and the input terminal of the voltage sampling module 110 is connected to the positive terminal of the main power supply circuit to collect the voltage value of the main power supply circuit (i.e. the voltage value of the load) in real time.
The constant power conversion module 120 is electrically connected to the output terminal of the voltage sampling module 110 to receive the voltage value output by the voltage sampling module 110. Meanwhile, the constant power conversion module 120 may be based on a formula
Iref＝Pc/Vo
Determining a target current value, wherein IrefRepresents a target current value, Pc represents a preset target power value, and Vo represents a current voltage value collected by the voltage sampling module 110.
It will be appreciated that the output of the constant power conversion module 120 is electrically connected to the current comparison module 140 to communicate the determined target current value to the current comparison module 140. The current sampling module 130 can collect the current value of the main power supply circuit and transmit the current value to the current comparing module 140. The current comparing module 140 generates an adjusting signal according to the current value and the target current value, and transmits the adjusting signal to the main power output module. The main power output module adjusts the output current according to the adjusting signal so as to enable the output power of the power supply main circuit to be constant.
For example, the current comparison module 140 generates a first adjustment signal when the target current value is greater than the present current value, and the current comparison module 140 generates a second adjustment signal when the target current value is less than the present current value. The main power output module promotes output current after receiving the first adjusting signal; and after receiving the second adjusting signal, the main power output module reduces the output current until the current value of the main power supply circuit is equal to the target current value. It should be noted that the same in the present application may mean that two values are identical, and may be defined as equal within a certain range of values. For example, when the target current value is 5A and the setting accuracy is 4.9A to 5.1A, if the present current value is 4.95A, the target current value and the present current value are also equal at this time. In other words, the target current value described in the present application is equal to the current value, and is associated with the accuracy of the actual setting, and the present application does not limit the concept of the equality at all.
For the safety and stability of the circuit in use, an isolation unit is required to be connected to both the input end and the output end of the constant power conversion module 120, so as to achieve isolation between the input end and the output end of the circuit.
Therefore, referring to fig. 2, the voltage sampling module 110 provided in the present application includes a first isolation unit, the constant power control circuit 100 further includes a second isolation unit 150 and a current reference module 160, and the constant power conversion module 120, the second isolation unit 150, the current reference module 160 and the current comparison module 140 are electrically connected in sequence. Due to the addition of the isolation unit, when the signal is transmitted, the direct current signal cannot be directly transmitted, but the direct current signal needs to be converted into the first PWM signal by the voltage sampling module 110 for transmission.
After the constant power converting unit receives the first PWM signal, the target current value may be determined, and it should be noted that, at this time, the target current value is actually the second PWM signal, and the constant power converting module 120 can transmit the second PWM signal to the current reference module 160 through the second isolating unit 150.
Since the current comparing module 140 is also a dc signal in practice during operation, the current reference module 160 is required to convert the second PWM signal into a dc signal, and then transmit the dc signal to the current comparing module 140, and finally the current comparing module 140 outputs the adjustment signal.
The following is an exemplary description of the specific structure of the constant power circuit provided in the present application:
referring to fig. 3, as an implementation manner, the voltage sampling module 110 includes a first isolation unit, a voltage sampling component, a first comparator and a reference voltage generating unit, where the voltage sampling component is electrically connected to the power supply main circuit and a first input port of the first comparator respectively, the reference voltage generating unit is electrically connected to a second input port of the first comparator, an output port of the first comparator is electrically connected to the first isolation unit, and the first isolation unit is further electrically connected to the constant power conversion module 120.
The first comparator is configured to obtain a current voltage value transmitted by the voltage sampling component and a reference voltage value transmitted by the reference voltage generating unit, and generate a first PWM signal according to the current voltage value and the reference voltage value, and the first isolating unit is configured to transmit the first PWM signal to the constant power converting module 120, so that the constant power converting module 120 determines a target current value according to the first PWM signal and a preset target power value.
Alternatively, in order to generate the first PWM signal, the reference voltage generating unit may generate a triangular wave signal, and the first comparator may be capable of generating a positive pulse signal when the present voltage value is greater than or equal to the reference voltage value and generating a negative pulse signal when the present voltage value is less than the reference voltage value. Of course, as another implementation manner, the first comparator can generate a negative pulse signal when the current voltage value is greater than or equal to the reference voltage value, and generate a positive pulse signal when the current voltage value is less than the reference voltage value, which is not limited in this application.
The voltage sampling component provided by the application samples the power supply main circuit in a voltage division sampling mode. The voltage sampling assembly comprises a first resistor R1 and a second resistor R2, one end of the first resistor R1 is electrically connected with the power supply main circuit, the other end of the first resistor R1 is electrically connected with the first input port of the first comparator and one end of the second resistor R2 respectively, and the other end of the second resistor R2 is grounded.
As an implementation manner, the first input port of the first comparator may be a positive input terminal, and it is understood that the reference voltage generating unit is electrically connected to a negative input terminal of the first comparator at this time.
The reference voltage generation unit comprises an operational amplifier and peripheral circuit elements, and the principle of the reference voltage generation unit is that a square wave generator is built by the operational amplifier, then a resistor and a capacitor are connected to the output end of the operational amplifier, and square waves are converted into triangular waves.
The first comparator generates and outputs a first PWM signal after receiving the current voltage value and the triangular wave signal input by the reference voltage generating unit.
The first isolation unit adopts an optocoupler mode and comprises a light emitting diode and a light receiving triode, the output end of the first comparator is electrically connected with the anode of the light emitting diode, and the cathode of the light emitting diode is grounded.
When the first comparator outputs the PWM signal, the light emitting diode emits light discontinuously, and then the light receiving triode is triggered to be conducted.
In addition, the second isolation unit 150 also adopts an optical coupler, the output end of the constant power conversion unit is electrically connected with the anode of the light emitting diode in the second isolation unit 150, and the cathode of the light emitting diode in the second isolation unit 150 is grounded, so that the transmission of the second PWM signal is realized.
As an optional implementation manner, the current reference module 160 includes a third resistor R3, a fourth resistor R4, a first capacitor C1, a fifth resistor R5, a sixth resistor R6, and a second capacitor C2, one end of the third resistor R3, the fourth resistor R4, and the first capacitor C1 after being connected in parallel is grounded, the other end of the third resistor R3583, the fourth resistor R4, and the first capacitor C1 are respectively electrically connected to one end of the current comparison module 140 and one end of the fifth resistor R5, the other end of the fifth resistor R5 is electrically connected to the second isolation unit 150, one end of the sixth resistor R6 is electrically connected to the second isolation unit 150, the other end of the sixth resistor R6 is respectively connected to a power supply and the second capacitor C2, and the second capacitor C2 is also grounded.
The other end of the fifth resistor R5 is electrically connected with the emitter of the light receiving triode, and the other end of the sixth resistor R6 is electrically connected with the collector of the light receiving triode. In the circuit, the second capacitor C2 is a filter capacitor, the first capacitor C1, the first resistor R1 and the second resistor R2 function to convert the PWM signal into a dc signal, and transmit the dc signal to the current comparing module 140.
As an implementation manner, the current comparing module 140 includes a second comparator and a feedback network, a positive input end of the second comparator is electrically connected to the constant power converting module 120, a negative input end of the second comparator is electrically connected to the current sampling module 130, and the feedback network is respectively connected to an output end and a negative input end of the second comparator.
The second comparator outputs a corresponding adjustment signal after comparing the current value with the target current value, and understandably, the output end of the second comparator is electrically connected with the main power output module. Through setting up feedback network, can play the effect of regulation, on the one hand, it can make the circuit more stable, and on the other hand, it also can adjust the speed that generates feedback signal.
It should be further noted that, as an implementation manner, the current sampling module 130 includes a current sampling resistor, one end of the current sampling resistor is electrically connected to the power supply main circuit, and the other end of the current sampling resistor is electrically connected to the current comparison module 140. And the current sampling resistor is connected with the positive output end of the second comparator.
Through the implementation mode, the current and the voltage in the power supply main circuit can be sampled, the target current is determined according to the voltage, the output current of the main power output module is adjusted through the comparison between the target current and the obtained current in the main circuit, and the purpose of constant power is achieved.
For example, please refer to tables one and two:
Watch two
The first table is output power data of a traditional power limiting technology during working, the second table is output power data of a constant power control circuit during working, and the table shows that the constant power control circuit can achieve the effect of constant power output.
Second embodiment
Based on the foregoing embodiments, the present application further provides a driving system, which includes a main power supply path, a main power output module, and the constant power control circuit 100 according to the first embodiment, wherein the main power supply path is electrically connected to the main power output module, the voltage sampling module 110, and the current sampling module 130, the main power supply path is further used for connecting a load, the constant power conversion module 120 is electrically connected to the current comparison module 140 and the voltage sampling module 110, and the current comparison module 140 is further electrically connected to the current sampling module 130 and the main power output module; the main power output module is used for supplying power to the load through the power supply main circuit; the voltage sampling module 110 is configured to collect a voltage value of the main power supply path and transmit the voltage value to the constant power conversion module 120; the constant power conversion module 120 is configured to determine a target current value according to a preset target power value and a preset voltage value, and transmit the target current value to the current comparison module 140; the current sampling module 130 is configured to collect a current value of the main power supply circuit and transmit the current value to the current comparing module 140; the current comparison module 140 is configured to generate an adjustment signal according to the current value and the target current value, and transmit the adjustment signal to the main power output module; the main power output module is also used for adjusting the output current according to the adjusting signal so as to enable the output power of the power supply main circuit to be constant.
Since the first embodiment has already described the constant power control circuit in detail, this embodiment will not be described again.
In summary, the present application provides a constant power control circuit and a driving system, the constant power control circuit includes a voltage sampling module, a constant power conversion module, a current sampling module and a current comparison module, the voltage sampling module and the current sampling module are respectively electrically connected to a main power supply circuit, the main power supply circuit is further used for connecting a load, the constant power conversion module is respectively electrically connected to the current comparison module and the voltage sampling module, the current comparison module is electrically connected to the current sampling module, and the current comparison module is further used for connecting a main power output module; the main power output module is used for supplying power to a load through a power supply main circuit; the voltage sampling module is used for collecting a voltage value of the power supply main circuit and transmitting the voltage value to the constant power conversion module; the constant power conversion module is used for determining a target current value according to a preset target power value and a preset voltage value and transmitting the target current value to the current comparison module; the current sampling module is used for collecting the current value of the power supply main circuit and transmitting the current value to the current comparison module; the current comparison module is used for generating an adjusting signal according to the current value and the target current value and transmitting the adjusting signal to the main power output module; the main power output module is also used for adjusting the output current according to the adjusting signal so as to enable the output power of the power supply main circuit to be constant. According to the constant power output circuit, the current and the voltage of the power supply main circuit can be respectively sampled through the current sampling module and the voltage sampling module, the target current value corresponding to the current voltage is determined through the constant power conversion module, then the adjusted signal is generated through comparison of the target current value and the current value, and therefore the main power output module can adjust the output current according to the adjusted signal, the output current value is equal to the target current value, and constant power output is achieved. Because this process is not artifical the intervention, consequently promoted efficiency, be difficult to appear overpower phenomenon simultaneously, consequently protected the lamp pearl.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made 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 will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. The constant-power control circuit is characterized by comprising a voltage sampling module, a constant-power conversion module, a current sampling module and a current comparison module;
the voltage sampling module and the current sampling module are respectively and electrically connected with a power supply main circuit, the power supply main circuit is also used for connecting a load, the constant power conversion module is respectively and electrically connected with the current comparison module and the voltage sampling module, the current comparison module is electrically connected with the current sampling module, and the current comparison module is also used for connecting a main power output module; wherein the content of the first and second substances,
the main power output module is used for supplying power to the load through the power supply main circuit;
the voltage sampling module is used for collecting a voltage value of the power supply main circuit and transmitting the voltage value to the constant power conversion module;
the constant power conversion module is used for determining a target current value according to a preset target power value and the voltage value and transmitting the target current value to the current comparison module;
the current sampling module is used for collecting the current value of the main power supply circuit and transmitting the current value to the current comparison module;
the current comparison module is used for generating an adjusting signal according to the current value and the target current value and transmitting the adjusting signal to the main power output module;
the main power output module is further configured to adjust an output current according to the adjustment signal, so that the output power of the main power supply circuit is constant.
2. The constant-power control circuit according to claim 1, wherein the voltage sampling module comprises a first isolation unit, a voltage sampling component, a first comparator and a reference voltage generation unit, the voltage sampling component is electrically connected with the main power supply circuit and a first input port of the first comparator respectively, the reference voltage generation unit is electrically connected with a second input port of the first comparator, an output port of the first comparator is electrically connected with the first isolation unit, and the first isolation unit is further electrically connected with the constant-power conversion module; wherein the content of the first and second substances,
the first comparator is used for acquiring a current voltage value transmitted by the voltage sampling component and a reference voltage value transmitted by the reference voltage generating unit and generating a first PWM signal according to the current voltage value and the reference voltage value;
the first isolation unit is used for transmitting the first PWM signal to the constant power conversion module, so that the constant power conversion module determines a target current value according to the first PWM signal and a preset target power value.
3. The constant power control circuit according to claim 2, wherein the voltage sampling component comprises a first resistor and a second resistor, one end of the first resistor is electrically connected to the power supply main circuit, the other end of the first resistor is electrically connected to the first input port of the first comparator and one end of the second resistor, respectively, and the other end of the second resistor is grounded.
4. The constant-power control circuit according to claim 2, wherein the reference voltage generating unit is configured to generate a triangular wave signal, the first comparator is configured to generate a positive pulse signal when the present voltage value is greater than or equal to the reference voltage value, and the first comparator is further configured to generate a negative pulse signal when the present voltage value is less than the reference voltage value.
5. The constant power control circuit according to claim 2, wherein the first isolation unit comprises an optocoupler.
6. The constant-power control circuit according to claim 1, further comprising a second isolation unit and a current reference module, wherein the constant-power conversion module, the second isolation unit, the current reference module and the current comparison module are electrically connected in sequence;
the constant power conversion module is used for outputting a second PWM signal and transmitting the second PWM signal to the current reference module through the second isolation unit;
the current reference module is used for converting the second PWM signal into a direct current signal and transmitting the direct current signal to the current comparison module.
7. The constant-power control circuit according to claim 6, wherein the current reference module includes a third resistor, a fourth resistor, a first capacitor, a fifth resistor, a sixth resistor, and a second capacitor, one end of the third resistor, the fourth resistor, and the first capacitor connected in parallel is grounded, the other end of the third resistor, the fourth resistor, and the first capacitor are electrically connected to one end of the current comparison module and one end of the fifth resistor, the other end of the fifth resistor is electrically connected to the second isolation unit, one end of the sixth resistor is electrically connected to the second isolation unit, the other end of the sixth resistor is connected to a power supply and the second capacitor, respectively, and the second capacitor is also grounded.
8. The constant-power control circuit as claimed in claim 1, wherein the current comparing module comprises a second comparator and a feedback network, wherein a positive input terminal of the second comparator is electrically connected to the constant-power converting module, a negative input terminal of the second comparator is electrically connected to the current sampling module, and the feedback network is respectively connected to an output terminal and a negative input terminal of the second comparator.
9. The constant power control circuit according to claim 1, wherein the current sampling module comprises a current sampling resistor, one end of the current sampling resistor is electrically connected to the main power supply circuit, and the other end of the current sampling resistor is electrically connected to the current comparison module.
10. A drive system comprising a main supply circuit, a main power output module and a constant power control circuit according to any one of claims 1 to 9,
the power supply main circuit is respectively and electrically connected with the main power output module, the voltage sampling module and the current sampling module, the power supply main circuit is also used for connecting a load, the constant power conversion module is respectively and electrically connected with the current comparison module and the voltage sampling module, and the current comparison module is also respectively and electrically connected with the current sampling module and the main power output module;
the main power output module is used for supplying power to the load through the power supply main circuit;
the voltage sampling module is used for collecting a voltage value of the power supply main circuit and transmitting the voltage value to the constant power conversion module;
the constant power conversion module is used for determining a target current value according to a preset target power value and the voltage value and transmitting the target current value to the current comparison module;
the current sampling module is used for collecting the current value of the main power supply circuit and transmitting the current value to the current comparison module;
the current comparison module is used for generating an adjusting signal according to the current value and the target current value and transmitting the adjusting signal to the main power output module;
the main power output module is further configured to adjust an output current according to the adjustment signal, so that the output power of the main power supply circuit is constant.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113406981A (en) * | 2021-05-17 | 2021-09-17 | 青岛海特生物医疗有限公司 | Circuit, method and device for controlling temperature of cell culture box and culture box |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113406981A (en) * | 2021-05-17 | 2021-09-17 | 青岛海特生物医疗有限公司 | Circuit, method and device for controlling temperature of cell culture box and culture box |
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