A load control circuit, method and electrical equipment

Abstract

The present invention discloses a load control circuit, method and electrical equipment. The load control includes: a first feedback unit, whose input end is connected to the output end of a microcontroller unit MCU, and whose output end is connected to the switch chip, for controlling the switching frequency of the switch chip under the control of the MCU, thereby controlling the output power of the transformer; the MCU, whose input end is connected to the load, is also used to collect load startup information and control the first feedback unit or the second feedback unit to be turned on; the second feedback unit, whose input end is connected between the transformer and the load, and whose output end is connected to the switch chip, for controlling the output power of the transformer according to the input voltage of the load. Through the present invention, the time for the load input voltage to reach stability can be effectively shortened, power consumption can be reduced, and the stability of the load startup or operation can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a load control circuit, method and electrical equipment. Background Art

[0002] Load refers to the electronic components connected to both ends of the power supply in the circuit. It is a device used to convert electrical energy into other forms of energy. When its working state needs to change, the voltage demand at both ends will also change. In the existing load control circuit, the switching power supply module starts to adjust the power supply after first detecting the voltage reduction of the transformer to restore the power supply to a stable value. In the adjustment process, it needs to be adjusted many times in a cycle to restore the power supply to a stable value. It needs to continuously detect the output voltage value of the transformer to determine whether the switching power supply module needs to adjust the output voltage. Sometimes, excessive voltage regulation output will increase the power consumption of the circuit. In other words, the current voltage output adjustment scheme is a hysteresis adjustment, and it takes a long time for the output voltage to stabilize and reach a stable state, which increases energy consumption.

[0003] With regard to the problem in the prior art that load input voltage regulation is lagging, resulting in high energy consumption, no effective solution has been proposed yet. Summary of the invention

[0004] The embodiments of the present invention provide a load control circuit, method and electrical equipment to solve the problem of load input voltage regulation lag in the prior art.

[0005] In order to solve the above technical problems, the present invention provides a load control circuit, wherein the load control circuit comprises:

[0006] A transformer and a switch chip, between the transformer and the load, the switch chip, the transformer and the power supply form a closed loop, and the load control circuit also includes:

[0007] A first feedback unit, whose input end is connected to the output end of the microcontroller unit MCU, and whose output end is connected to the switch chip, is used to control the switching frequency of the switch chip under the control of the MCU, thereby controlling the output power of the transformer;

[0008] The MCU, whose input end is connected to the load, is also used to collect load startup information and control the first feedback unit or the second feedback unit to be turned on;

[0009] The second feedback unit has an input end connected between the transformer and the load, and an output end connected to the switch chip, and is used to control the output power of the transformer according to the input voltage of the load.

[0010] Furthermore, the MCU is specifically used for:

[0011] Before the load is about to start, the first feedback unit is controlled to be turned on, and the output power of the transformer is controlled by controlling the conduction frequency of the first feedback unit; after the load is started, the second feedback unit is controlled to be turned on.

[0012] Furthermore, the load control circuit further includes:

[0013] A first switch element has a first end connected to the switch chip, and a second end selectively connected to the first feedback unit or the second feedback unit.

[0014] Furthermore, the first switch element is a relay, and both ends of the coil of the relay are connected to the MCU. The MCU is used to control the coil of the relay to be turned on before the load is about to start, so that the switch chip is connected to the first feedback unit.

[0015] Furthermore, the first pin of the input end of the second feedback unit is connected between the transformer and the load through a first voltage divider circuit, wherein the first voltage divider circuit includes a first resistor and a second resistor, and the first pin of the input end of the second feedback unit is connected between the first resistor and the second resistor.

[0016] Furthermore, the load control circuit further includes:

[0017] A second switch element, the second pin of the input end of the second feedback unit is grounded through the second switch, and the second switch element is used to control whether the first pin and the second pin of the input end of the second feedback unit are turned on according to the input voltage of the load.

[0018] Furthermore, a first end of the second switch element is connected to a second pin of the input end of the second feedback unit, a second end is grounded, and a third end is connected to the input end of the load through a third resistor.

[0019] Furthermore, the load control circuit further includes:

[0020] A power supply inductor, wherein the power supply inductor is arranged on the iron core of the transformer and is wound on the same side as the primary coil of the transformer, and a first end of the power supply inductor is respectively connected to a first pin of an output end of a first feedback unit and a first pin of an output end of a second feedback unit, so as to provide a conduction voltage for the output end of the first feedback unit and the output end of the second feedback unit.

[0021] Furthermore, the switching power supply chip is selectively connected to the second pin of the output end of the first feedback unit or the second pin of the output end of the second feedback unit.

[0022] The present invention also provides an electrical device, comprising the load control circuit.

[0023] The present invention also provides a load control method, which is applied to the above-mentioned load control circuit. The load control method comprises:

[0024] Collect load startup information;

[0025] Controlling the first feedback unit or the second feedback unit to be turned on according to the load startup information;

[0026] After the first feedback unit is controlled to be turned on, the output power of the transformer is controlled by controlling the conduction frequency of the first feedback unit.

[0027] Further, according to the load startup information, controlling the first feedback unit or the second feedback unit to be turned on includes:

[0028] Before the load is about to start, controlling the conduction of the first feedback unit;

[0029] After the load is started, the second feedback unit is controlled to be turned on.

[0030] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the program implements the above-mentioned load control method when executed by a processor.

[0031] By applying the technical solution of the present invention, the load startup information is collected through the MCU, and the output power change of the transformer is controlled in advance according to the load startup information, and the voltage required by the output load is output, which can effectively shorten the time for the load input voltage to reach stability, reduce power consumption, and improve the stability of load startup or operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a structural diagram of a load control circuit according to a first embodiment of the present invention;

[0033] Figure 2 is a structural diagram of a load control circuit according to a second embodiment of the present invention;

[0034] Figure 3 is a structural diagram of a load control circuit according to a third embodiment of the present invention;

[0035] Figure 4 is a flow chart of a load control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0038] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0039] It should be understood that, although the terms first, second, third, etc. may be used to describe the feedback units in the embodiments of the present invention, the feedback units should not be limited to these terms. These terms are only used to distinguish the feedback units. For example, without departing from the scope of the embodiments of the present invention, the first feedback unit may also be referred to as the second feedback unit, and similarly, the second feedback unit may also be referred to as the first feedback unit.

[0040] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0041] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0042] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0043] Example 1

[0044] This embodiment provides a load control circuit. Figure 1 FIG. 4 is a structural diagram of a load control circuit according to a first embodiment of the present invention. Figure 1 As shown, the load control circuit includes a transformer 10 and a switch chip 20. The transformer 10 is connected between a power source 40 and a load 30. The switch chip 20 forms a closed loop with the transformer 10 and the power source 40. The load control circuit also includes:

[0045] A first feedback unit 50, whose input end is connected to the output end of the microcontroller unit MCU60, and whose output end is connected to the switch chip 20, is used to control the switching frequency of the switch chip 20 under the control of the MCU60, thereby controlling the output power of the transformer 10;

[0046] MCU60, whose input end is connected to the load 30, is also used to collect load startup information and control the first feedback unit 50 or the second feedback unit 70 to be turned on;

[0047] The second feedback unit 70 has an input end connected between the transformer 10 and the load 30 , and an output end connected to the switch chip 20 , and is used to control the output power of the transformer 10 according to the input voltage of the load 30 .

[0048] In this embodiment, the MCU 60 is specifically used for: detecting the startup information of the load 30 before the load 30 is about to start, controlling the first feedback unit 50 to turn on, and after controlling the first feedback unit 50 to turn on, increasing the on-frequency of the first feedback unit 50, thereby controlling the switching frequency of the switch chip 20 to increase, and finally controlling the output power of the transformer 10 to increase to meet the startup requirements of the load 30; after the load is started, controlling the second feedback unit 70 to turn on, detecting the input voltage of the load 30 through the second feedback unit 70, and when the input voltage of the load 30 drops, controlling the frequency of the switch chip 20 by controlling the second feedback unit 70, thereby controlling the output power of the transformer 10.

[0049] The load control circuit of this embodiment collects load startup information through the MCU, and controls the output power change of the transformer in advance according to the load startup information, and outputs the voltage required by the load, which can effectively shorten the time for the load input voltage to reach stability, reduce power consumption, and improve the stability of load startup or operation.

[0050] Example 2

[0051] This embodiment provides another load control circuit. Figure 2FIG. 1 is a structural diagram of a load control circuit according to a second embodiment of the present invention. In order to realize the switching of the first feedback unit 50 and the second feedback unit 70, as shown in FIG. Figure 2 As shown, based on the above embodiment, the load control circuit further includes:

[0052] The first switch element K1 has a first end connected to the switch chip 20, and a second end selectively connected to the first feedback unit 50 or the second feedback unit 70. Specifically, the first switch element K1 is a relay, including a moving end a, a first contact b, and a second contact c, wherein the moving end a is connected to the switch chip 20, the first contact b is connected to the first feedback unit 50, and the second contact c is connected to the second feedback unit 70. When the coil L1 of the relay is energized, the moving end a and the first contact b are attracted, and when the coil L1 of the relay is de-energized, the moving end a and the second contact c are attracted. Both ends of the coil L1 of the relay are connected to the MCU60. Through the MCU60, before the load 30 is about to start, the coil L1 of the relay is controlled to be energized so that the switch chip 20 is connected to the first feedback unit 50. After the load 30 is started, the coil L1 of the relay is controlled to be de-energized so that the switch chip 20 is connected to the second feedback unit 70.

[0053] In this embodiment, the first feedback unit 50 and / or the second feedback unit 70 may be a photoelectric coupler. Since the input voltage of the photoelectric coupler needs to be within a certain range and cannot be too large, in order to avoid the input voltage of the photoelectric coupler (i.e., the second feedback unit 70) being too large, Figure 2 As shown, the first pin of the input end of the second feedback unit 70 is connected between the transformer 10 and the load 30 through the first voltage divider circuit, wherein the first voltage divider circuit includes a first resistor R1 and a second resistor R2, the first resistor R1 is connected between the transformer 10 and the load 30, and the second resistor R2 is grounded. After the voltage is divided by the first resistor R1 and the second resistor R2, the collected load voltage value is reduced to below the maximum operating voltage of the photocoupler, and the first pin of the input end of the second feedback unit 70 is connected between the first resistor R1 and the second resistor R2.

[0054] In order to control the conduction of the input terminal of the second feedback unit, Figure 2 As shown, the load control circuit further includes:

[0055] The second switch element K2, the second pin of the input end of the second feedback unit 70 is grounded through the second switch K2, and the second switch element K2 is used to control whether the first pin and the second pin of the input end of the second feedback unit 70 are turned on according to the input voltage of the load 30. Specifically, when the load 30 is started, the voltage at its input end will decrease. After the input voltage of the load 30 decreases, the second switch element K2 is turned on, thereby controlling the conduction between the two pins of the input end of the second feedback unit 70.

[0056] In the present embodiment, the second switch element K2 may be a TL431 voltage regulator chip, which includes a first terminal 1, a second terminal 2 and a third terminal 3, wherein the first terminal 1 is connected to the second pin of the input terminal of the second feedback unit 70, the second terminal 2 is grounded, and the third terminal 3 is a control terminal. Since the input voltage of the load 30 may be higher than the reference voltage 2.5V of the TL431 voltage regulator chip, the third terminal 3 is connected to the input terminal of the load 30 through the third resistor R3 in the present embodiment, and the third resistor R3 is used for voltage division, so that after the load is started, the input voltage is reduced, and the input voltage of the third terminal 3 is lower than 2.5V, thereby controlling the conduction between the first terminal 1 and the second terminal 2, and finally realizing the control of the conduction between the first pin and the second pin of the input terminal of the second feedback unit 70. In the present embodiment, a capacitor C is also provided between the first terminal 1 and the third terminal 3, which is used to filter the collected input voltage of the load.

[0057] Since the first feedback unit 50 and / or the second feedback unit 70 are photoelectric couplers, the output end also needs a certain voltage to be turned on. In order to provide a voltage to turn on the first feedback unit 50 and / or the second feedback unit 70, the load control circuit further includes:

[0058] Power supply inductor L2, such as Figure 2 As shown, in this embodiment, the primary coil of the transformer is L3, and the secondary coil is L4. The primary coil L3 and the secondary coil L4 are wound on both sides of the same iron core. The power supply inductor L2 is also arranged on the iron core and wound on the same side as the primary coil L3 of the transformer. The first end of the power supply inductor L2 is connected to the first pin of the output end of the first feedback unit 50 and the first pin of the output end of the second feedback unit 70 through the unidirectional conducting diode D and the fourth resistor R4, respectively, for providing a conduction voltage for the output end of the first feedback unit 50 and / or the output end of the second feedback unit 70.

[0059] Since the first feedback unit 50 and / or the second feedback unit 70 in the present embodiment is a photoelectric coupler, the output end and the input end of the photoelectric coupler each have two pins, the two pins of the input end are conductive, the two pins of the input end are conductive, and the input ends are isolated from each other. Therefore, in the present embodiment, the switching power supply chip is selectively connected to the second pin of the output end of the first feedback unit 50 or the second pin of the output end of the second feedback unit 70.

[0060] Example 3

[0061] This embodiment provides another load control circuit. Figure 3 FIG. 4 is a structural diagram of a load control circuit according to a third embodiment of the present invention. Figure 3As shown, the load control circuit of this embodiment includes a rectifier bridge 31, a transformer 32, a switch chip 33, a first optocoupler OC1, a second optocoupler OC2 and an MCU34. The power supply passes through the rectifier bridge 31, the transformer 32 and the switch chip 33. The output power of the transformer is adjusted by adjusting the switch chip 33. In this embodiment, the input voltage passes through the rectifier bridge 31, the transformer 32, the first optocoupler OC1 and the switch chip 33 to form a closed-loop control circuit. The input voltage passes through the rectifier bridge 31, the transformer 32, the first optocoupler OC1 and the switch chip 33 to form a second closed-loop control circuit. A dual-loop feedback control circuit is used to improve power supply reliability and enhance power supply stability.

[0062] The existing load control circuit has the defect that the feedback control can only perform hysteresis adjustment, and the power consumption is seriously wasted. For example, if the working voltage of the load is 12V, after the load is suddenly connected, the switch chip may need 10s to adjust the 12V voltage to stabilize the input voltage of the load, then 9s of the time is a waste of power.

[0063] In this embodiment, the startup information of the load is obtained through MCU34. Before the load is started, the output power of the transformer is increased in advance. When the load is turned on, the power supply voltage will not be unstable due to the sudden increase in the load, which greatly shortens the time required for power supply voltage regulation. Since the load power consumption mainly comes from the power supply, the load power consumption can also be reduced to a large extent.

[0064] Specifically, MCU34 determines which loads will be turned on in the next second based on the load startup requirements, calculates the difference between the required power supply power and the existing power, and after processing, outputs a control signal to the first optocoupler OC1 through the IO interface of MCU34. The output end of the first optocoupler OC1 controls the switch chip to increase the switching frequency of the switch chip, thereby increasing the output power of the transformer first. After the output power of the transformer increases, the load is turned on, which solves the problem of MCU34 resetting or freezing due to sudden load turning on, and indirectly solves the problem of the turned-on load not being able to operate normally or stop working due to the turning on of other loads, thereby improving the stability and reliability of the power supply and greatly improving product performance.

[0065] Example 4

[0066] This embodiment provides an electrical device, including the above-mentioned load control circuit, which is used to control the power of the load in advance according to the startup information of the load.

[0067] Example 5

[0068] This embodiment provides a load control method, which is applied to the above-mentioned load control circuit. Figure 4is a flow chart of a load control method according to an embodiment of the present invention. Figure 4 As shown, the load control method includes:

[0069] S101, collecting load startup information. Specifically, the microcontroller unit MCU determines which loads will be started in the next second and which loads have been started according to the load startup requirements.

[0070] S102, according to the load startup information, control the first feedback unit or the second feedback unit to be turned on. According to the load that will be started in the next second, the startup information of each load is judged, and for the load that will be started in the next second, the first feedback unit is controlled to be turned on; for the load that has completed startup, after the load startup is completed, the second feedback unit is controlled to be turned on.

[0071] S103, after controlling the first feedback unit to be turned on, the output power of the transformer is controlled by controlling the conduction frequency of the first feedback unit. If the load is about to start in the next second, first, the MCU controls the relay connected thereto to be energized to turn on the first feedback unit. After the first feedback unit is turned on, the difference between the required power and the existing power is calculated. The difference is processed and a PWM control signal is output to the first feedback unit through the IO port of the MCU. The output end of the first feedback unit controls the switch chip to increase the switching frequency of the switch chip, thereby increasing the output power of the transformer first. The load is turned on after the output power of the transformer increases.

[0072] The load control method of this embodiment collects load startup information, controls the output power change of the transformer in advance according to the load startup information, and outputs the voltage required by the load, which can effectively shorten the time it takes for the load input voltage to reach stability, reduce power consumption, and improve the stability of load startup or operation.

[0073] Example 6

[0074] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the load control method in the above embodiment is implemented.

[0075] The circuit embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0076] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A load control circuit, comprising a transformer and a switch chip, wherein a closed loop is formed between the transformer and the load, and the switch chip, the transformer and a power supply, wherein: The circuit further comprises: A first feedback unit, whose input end is connected to the output end of the microcontroller unit MCU, and whose output end is connected to the switch chip, is used to control the switching frequency of the switch chip under the control of the MCU, thereby controlling the output power of the transformer; The MCU, whose input end is connected to the load, is also used to collect load startup information and control the first feedback unit or the second feedback unit to be turned on; the MCU is specifically used to: detect the startup information of the load, control the first feedback unit to be turned on before the load is about to start, and after controlling the first feedback unit to be turned on, control the conduction frequency of the first feedback unit to increase, thereby controlling the switching frequency of the switch chip to increase, and finally controlling the output power of the transformer to increase to meet the startup requirement of the load; after the load is started, control the second feedback unit to be turned on, detect the input voltage of the load through the second feedback unit, and when the load input voltage drops, control the frequency of the switch chip by controlling the second feedback unit, thereby controlling the output power of the transformer; The second feedback unit has an input end connected between the transformer and the load, and an output end connected to the switch chip, and is used to control the output power of the transformer according to the input voltage of the load.

2. The load control circuit according to claim 1, characterized in that: The load control circuit further includes: A first switch element has a first end connected to the switch chip, and a second end selectively connected to the first feedback unit or the second feedback unit.

3. The load control circuit according to claim 2, characterized in that: The first switch element is a relay, and both ends of the coil of the relay are connected to the MCU. The MCU is used to control the coil of the relay to be turned on before the load is about to start, so that the switch chip is connected to the first feedback unit.

4. The load control circuit according to claim 1, characterized in that: The first pin of the input end of the second feedback unit is connected between the transformer and the load through a first voltage divider circuit, wherein the first voltage divider circuit includes a first resistor and a second resistor, and the first pin of the input end of the second feedback unit is connected between the first resistor and the second resistor.

5. The load control circuit according to claim 1, characterized in that: The load control circuit further includes: A second switch element, the second pin of the input end of the second feedback unit is grounded through the second switch, and the second switch element is used to control whether the first pin and the second pin of the input end of the second feedback unit are turned on according to the input voltage of the load.

6. The load control circuit according to claim 5, characterized in that: The first end of the second switch element is connected to the second pin of the input end of the second feedback unit, the second end is grounded, and the third end is connected to the input end of the load through a third resistor.

7. The load control circuit according to claim 1, characterized in that: The load control circuit further includes: A power supply inductor, wherein the power supply inductor is arranged on the iron core of the transformer and is wound on the same side as the primary coil of the transformer, and a first end of the power supply inductor is respectively connected to a first pin of an output end of a first feedback unit and a first pin of an output end of a second feedback unit, so as to provide a conduction voltage for the output end of the first feedback unit and the output end of the second feedback unit.

8. The load control circuit according to claim 7, characterized in that: The switch chip is alternatively connected to the second pin of the output end of the first feedback unit or the second pin of the output end of the second feedback unit.

9. An electrical device, characterized in that: The load control circuit comprises the load control circuit described in any one of claims 1 to 8.

10. A load control method, applied to the load control circuit according to any one of claims 1 to 8, characterized in that: The method comprises: Collect load startup information; According to the load startup information, the first feedback unit or the second feedback unit is controlled to be turned on; the method includes: detecting the startup information of the load, controlling the first feedback unit to be turned on before the load is about to start, and after controlling the first feedback unit to be turned on, increasing the on-frequency of the first feedback unit, thereby controlling the switching frequency of the switch chip to increase, and finally controlling the output power of the transformer to increase to meet the startup requirement of the load; after the load startup is completed, controlling the second feedback unit to be turned on, detecting the input voltage of the load through the second feedback unit, and when the load input voltage drops, controlling the frequency of the switch chip by controlling the second feedback unit, thereby controlling the output power of the transformer.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the load control method according to claim 9 or 10 is implemented.

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