CN211014440U

CN211014440U - Constant current control circuit and constant current control system

Info

Publication number: CN211014440U
Application number: CN201921723436.8U
Authority: CN
Inventors: 郭伟峰; 李照华; 郭东剑
Original assignee: Shenzhen Sunmoon Microelectronics Co Ltd
Current assignee: Shenzhen Sunmoon Microelectronics Co Ltd
Priority date: 2019-10-14
Filing date: 2019-10-14
Publication date: 2020-07-14
Anticipated expiration: 2029-10-14

Abstract

A constant current control circuit and a constant current control system are provided, the constant current control circuit comprises: the device comprises a first switch module, a voltage sampling module, an operational amplification module, a detection module, a first counting module, a second counting module and a digital-to-analog conversion module; the voltage sampling module samples the output voltage of the object to be controlled to obtain a first sampling voltage, the detection module detects whether the object to be controlled is in a constant current state or not according to a comparison result between the first sampling voltage and a second reference voltage, when the object to be controlled is judged to be in a non-constant current state, a voltage detection signal is generated, and after the voltage detection signal is converted and processed, the input current state of the object to be controlled is controlled in real time, so that the object to be controlled is kept in the constant current state; the embodiment can be accessed to the sampling voltage of the object to be controlled, and the constant current control function is realized by adopting a pre-judgment mode based on the reference voltage, so that the steps of constant current control are simplified, and the electric energy loss in the constant current control process is avoided.

Description

Constant current control circuit and constant current control system

Technical Field

The application belongs to the technical field of electronic circuits, and particularly relates to a constant current control circuit and a constant current control system.

Background

With the continuous popularization of electronic products, people can realize different circuit control functions for the electronic products so as to realize corresponding circuit functions in various technical fields, the accurate and stable control of the electronic products is of great significance not only for the power supply safety of the electronic products, but also the omnibearing control is carried out through the electronic products, the practical value of the electronic products can be favorably improved, the actual circuit function requirements of users are met, and good use experience is brought to the users; for example, the electronic product can maintain higher working stability and safety by performing constant current control on the electronic product, and the electronic product can be suitable for different industrial technical fields to meet the use requirements of corresponding circuit functions; further, the constant current control performance of electronic products has become an important factor affecting the practical value of electronic products.

However, when the conventional technology performs constant current control on an electronic product, resistance sampling and voltage processing need to be performed on input electric energy of the electronic product for multiple times to obtain a change situation of the input electric energy, and a constant current detection and constant current control function of the electronic product is realized according to the electric energy change situation after the voltage processing, so that the conventional constant current control method needs to perform processing such as voltage division on the sampled voltage for multiple times to obtain the change situation of the input electric energy of the electronic product and realize the constant current detection function, and thus, a large electric energy loss is generated in the process of voltage division processing on the input electric energy of the electronic product, and the process of constant current detection is more complicated and is inconvenient for users to use; moreover, because the input electric energy of the electronic product has a large fluctuation state, if the real-time constant current control function of the electronic product is to be realized, the high-precision resistance sampling and conversion processing needs to be carried out on the input electric energy of the electronic product, so that the process manufacturing difficulty and the application difficulty in the constant current control process are increased, the practical value of the constant current control function of the electronic product is reduced, and the universal application is difficult.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the present application provides a constant current control circuit and a constant current control system, and aims to solve the problems that in the conventional technical scheme, a large electric energy loss is generated in the process of performing constant current control on an electronic product, the complexity of constant current detection is improved, and the constant current control difficulty of the electronic product is large and the electronic product is difficult to be universally applied.

A first aspect of an embodiment of the present application provides a constant current control circuit, which is connected to an object to be controlled, and includes:

the first switch module is connected in a power supply loop of the object to be controlled in series and is configured to be conducted according to a first switch signal;

the voltage sampling module is connected in a power supply loop of the object to be controlled in series and is configured to collect the output voltage of the object to be controlled and obtain a first sampling voltage;

the operational amplification module is connected with the voltage sampling module and the first switch module, is configured to access a first reference voltage and the first sampling voltage, and performs operational amplification according to a difference value between the first reference voltage and the first sampling voltage to generate the first switch signal;

the detection module is connected with the voltage sampling module and is configured to access the first sampling voltage, compare the first sampling voltage with a second reference voltage to judge whether the object to be controlled is in a constant current state, and generate a voltage detection signal if the object to be controlled is in a non-constant current state;

a first counting module connected with the detection module and configured to generate a counting trigger signal according to an oscillation signal and the voltage detection signal;

the second counting module is connected with the first counting module and the detection module, is configured to perform addition counting according to the counting trigger signal and the voltage detection signal, and obtains a digital control signal; and

and the digital-to-analog conversion module is connected with the second counting module and the power supply loop of the object to be controlled and is configured to perform digital-to-analog conversion on the digital control signal to obtain an analog control signal so as to keep the operating current of the object to be controlled constant.

In one embodiment thereof, the detection module comprises:

the first comparator unit is connected with the voltage sampling module, the second counting module and the first counting module, is configured to access the first sampling voltage, compares the first sampling voltage with a third reference voltage to judge whether the object to be controlled is in a constant current state, and generates a first voltage detection signal if the object to be controlled is in a non-constant current state; and

the second comparator unit is connected with the voltage sampling module and the first counting module, is configured to access the first sampling voltage, compares the first sampling voltage with a fourth reference voltage to judge whether the object to be controlled is in a constant current state, and generates a second voltage detection signal if the object to be controlled is in a non-constant current state;

wherein the third reference voltage and the fourth reference voltage are different.

In one embodiment, the third reference voltage satisfies the following relationship:

D＝B*E；

in the above formula, D is the third reference voltage, B is the first reference voltage, and E is a real number between 0.1 and 1;

the fourth reference voltage satisfies the following relationship:

F＝B*G；

in the above formula, F is the fourth reference voltage, and G is a real number between 0.1 and 1;

where E is not equal to G.

In one embodiment, the first counting module comprises:

a first logic operation unit connected to the first comparator unit and the second comparator unit, and configured to perform an and logic operation on the first voltage detection signal and the second voltage detection signal to obtain a first trigger signal;

an oscillation unit configured to generate the oscillation signal;

the first counting unit is connected with the first logic operation unit, the oscillation unit and the second counting module and is configured to reset according to the first trigger signal and the oscillation signal to obtain a first level signal; and

and the first inverting unit is connected with the first counting unit and the second counting module and is configured to invert the first level signal to obtain the counting trigger signal.

In one embodiment, the second counting module comprises:

the second logic operation unit is connected with the first counting unit and is configured to perform AND logic operation on the first level signal and the clock signal to obtain a first control signal;

a third logic operation unit connected to the first inverting unit and the first comparator unit, and configured to perform an and logic operation on the count trigger signal and the first voltage detection signal to obtain a second control signal;

a fourth logic operation unit connected to the second logic operation unit and the third logic operation unit, and configured to perform an or logic operation on the first control signal and the second control signal to obtain a third control signal; and

and the second counting unit is connected with the fourth logic operation unit, the first inverting unit and the digital-to-analog conversion module, and is configured to perform addition counting on the third control signal according to the counting trigger signal and obtain the digital control signal.

In one embodiment, the detection module further comprises:

a first voltage reference unit connected to the first comparator unit and configured to generate the third reference voltage; and

a second voltage reference unit connected to the second comparator unit and configured to generate the fourth reference voltage.

In one embodiment thereof, said E is 0.98;

the G is 0.9.

In one embodiment, the method further comprises:

and the second switch module is connected with the digital-to-analog conversion module, is connected in series in a power supply loop of the object to be controlled, and is configured to adjust the operating current of the object to be controlled according to the analog control signal.

In one embodiment, the operational amplification module includes:

a first resistor and an operational amplifier;

the first end of the first resistor is used for being connected with the first reference voltage, the second end of the first resistor is connected with the positive phase input end of the operational amplifier, the reverse phase input end of the operational amplifier is connected with the voltage sampling module, and the output end of the operational amplifier is connected with the first switch module.

A second aspect of an embodiment of the present application provides a constant current control system, including:

an object to be controlled; and

the constant current control circuit is connected with the object to be controlled, and is used for performing constant current control on the object to be controlled; wherein, the object to be controlled comprises a light-emitting module.

The constant current control circuit can sample the output voltage of the object to be controlled through the detection module to obtain a first sampling voltage, and realizes the function of pre-detecting and judging the constant current state of the object to be controlled according to the difference value between the first sampling voltage and the first reference voltage, so that the control response precision and the control response rate of the constant current state of the object to be controlled are greatly improved, and the constant current control response step and the constant current control response flow of the object to be controlled are simplified; when the object to be controlled is judged to be in a non-constant current state, the counting trigger signal and the voltage detection signal are subjected to addition counting to obtain a digital control signal, and after digital-to-analog conversion is performed on the digital control signal, the accurate and stable constant current control function on the object to be controlled is realized, so that the constant current control safety and stability of the object to be controlled are guaranteed; therefore, the embodiment can realize the real-time detection and judgment functions of the constant current state of the object to be controlled by the pre-detection judgment mode between the first sampling voltage and the first reference voltage, the constant current control of the object to be controlled can be completed by directly obtaining the sampling voltage on the power supply loop, no additional processing step is required to be carried out on the sampling voltage, the electric energy loss of the object to be controlled in the constant current control process is avoided, the steps of the constant current detection and the constant current control are simplified, the constant current control circuit has higher constant current control stability and accuracy, the constant current control circuit can ensure that the running current of the object to be controlled is maintained in a constant state in real time, the detection sensitivity and controllability for the constant current state of the object to be controlled are higher, the application range is wider, and the constant current control requirements of electronic products of users are met.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a constant current control circuit according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a detection module according to an embodiment of the present application;

fig. 3 is a schematic diagram illustrating a magnitude relationship between an operating voltage of an object to be controlled and a reference voltage according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram illustrating another magnitude relationship between an operating voltage of an object to be controlled and a reference voltage according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram illustrating another magnitude relationship between an operating voltage of an object to be controlled and a reference voltage according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a first counting module according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a second counting module according to an embodiment of the present application;

fig. 8 is another schematic structural diagram of a detection module according to an embodiment of the present application;

fig. 9 is another schematic structural diagram of a constant current control circuit according to an embodiment of the present application;

fig. 10 is a schematic circuit diagram of an operational amplifier module according to an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of a constant current control system according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It should be noted that, the "object to be controlled" referred to herein is various types of electronic devices in the field, and the constant current and constant current control circuit in this embodiment can perform real-time current control on the object to be controlled, so as to keep the current of the object to be controlled constant, thereby greatly improving the application range of the constant current control circuit.

Referring to fig. 1, in a schematic structural diagram of a constant current control circuit 10 provided in the embodiment of the present application, the constant current control circuit 10 is connected to an object 20 to be controlled, and the constant current control circuit 10 can keep the operating current of the object 20 to be controlled constant, so as to improve the working efficiency and control safety of the object 20 to be controlled; for convenience of explanation, only the parts related to the present embodiment are shown, and detailed as follows:

the constant current control circuit 10 includes: the circuit comprises a first switch module 101, a voltage sampling module 102, an operational amplification module 103, a detection module 104, a first counting module 105, a second counting module 106 and a digital-to-analog conversion module 107.

The first switch module 101 is connected in series in the power supply loop of the object to be controlled 20 and is configured to be turned on according to a first switch signal.

When the first switch module 101 is turned on, the power supply loop of the object 20 to be controlled can transmit electric energy, so that the power supply loop of the object 20 to be controlled can be connected with the electric energy by turning on or off the first switch module 101 to maintain a normal circuit function; therefore, the power transmission state of the power supply loop of the object 20 to be controlled can be controlled in real time through the first switch signal, and the power supply loop of the object 20 to be controlled has good on-off control performance.

The voltage sampling module 102 is connected in series in a power supply loop of the object to be controlled 20, and is configured to collect an output voltage of the object to be controlled 20 and obtain a first sampling voltage.

Illustratively, the voltage sampling module 102 includes a sampling resistor, a first end of the sampling resistor is used for receiving the object 20 to be controlled, and a second end of the sampling resistor is grounded GND, wherein the sampling resistor is directly connected in series in a power supply loop of the object 20 to be controlled, and the voltage sampling module 102 can sensitively acquire an electric energy output fluctuation state of the object 20 to be controlled, so as to conveniently and accurately judge a constant current state of the object 20 to be controlled, and realize a constant current real-time control function of the object 20 to be controlled; the constant current control efficiency of the object 20 to be controlled can be accelerated based on the voltage sampling function of the voltage sampling module 102.

The operational amplification module 103 is connected to the voltage sampling module 102 and the first switch module 101, and configured to access a first reference voltage and the first sampling voltage, and perform operational amplification according to a difference between the first reference voltage and the first sampling voltage to generate the first switch signal.

The operational amplification module 103 can perform operational amplification on the voltage difference, and the first switch module 101 can be in a conducting state through a first switch signal output by the operational amplification module 103, so that a feedback control function on the electric energy input state of the object 20 to be controlled is realized, and the electric energy transmitted by a power supply loop of the object 20 to be controlled is maintained in a safer and more stable state; specifically, the first reference voltage provides reference voltage information, and after the voltage sampling module 102 samples the fluctuation state of the output voltage of the object 20 to be controlled, the sampled voltage can be fed back to the operational amplification module 103, so that the accuracy and reliability of controlling the current transmission state of the object 20 to be controlled are improved, and the object 20 to be controlled can be connected to corresponding electric energy according to the actual circuit function requirements of technicians.

The detection module 104 is connected to the voltage sampling module 102, and is configured to access the first sampling voltage, compare the first sampling voltage with the second reference voltage to determine whether the object 20 to be controlled is in a constant current state, and generate a voltage detection signal if the object 20 to be controlled is in a non-constant current state.

The detection module 104 has the functions of voltage detection and voltage comparison, voltage information is accessed through the detection module 104, and then the constant current state of the object 20 to be controlled can be obtained in real time according to the fluctuation condition of the sampling voltage of the voltage sampling module 20, so that the efficient constant current control function of the object 20 to be controlled can be realized; the second reference voltage provides reference information for the constant current judgment process of the object 20 to be controlled, and then the running current fluctuation condition of the object 20 to be controlled is judged according to the comparison result between the first sampling voltage and the second reference voltage; specifically, the detection module 104 detects whether the object to be controlled is in a constant current state according to a comparison result between the first sampling voltage and the second reference voltage within a preset time period; for example, when the detection module 104 detects that the operating current fluctuation amount of the object 20 to be controlled is within the preset fluctuation error within the preset time period, it indicates that the object 20 to be controlled is in the constant current state; therefore, in the embodiment, the second reference voltage is used as the reference voltage judgment threshold to obtain whether the running current of the object 20 to be controlled is in the constant current state, and operations such as voltage division again on the sampling voltage of the object 20 to be controlled are not needed, so that the precision and stability of the constant current control of the object 20 to be controlled are greatly guaranteed; therefore, in the embodiment, only the judgment standard of the constant current state needs to be set through the reference voltage, the function of pre-detection judgment on the constant current state of the object to be controlled can be realized, and the electric energy loss in the detection process of the constant current state is completely avoided.

The first counting module 105 is connected to the detection module 104 and configured to generate a counting trigger signal according to the oscillation signal and the voltage detection signal.

The first counting module 105 has high signal processing and conversion functions, and provides an oscillation signal for the first counting module 105, when the object 20 to be controlled is in a constant current state or a non-constant current state, the first counting module 105 is in different working states, so that the self-adaptive constant current control function of the object 20 to be controlled is realized, and the internal signal conversion efficiency and the conversion precision of the constant current control circuit 10 are improved; when the object 20 to be controlled is in a non-constant current state, the first counting module 105 immediately outputs a counting trigger signal to control the current running state of the object 20 to be controlled in real time, so as to ensure the constant current control precision and accuracy of the object 20 to be controlled.

The second counting module 106 is connected to the first counting module 105 and the detecting module 104, and configured to perform an addition counting according to the counting trigger signal and the voltage detection signal, and obtain the digital control signal.

Illustratively, the second counting module 106 has a binary signal counting function of the signal, and after a rising edge or a falling edge of the signal is calculated according to a two-level system addition, a corresponding digital control signal can be obtained, wherein the digital control signal serves as a digital quantity and can satisfy the efficient operation and control function of the constant current control circuit 10; wherein, the second counting module 106 can realize the addition counting function only when the first counting module 105 outputs the counting trigger signal; when the first counting module 105 does not output the counting trigger signal, the second counting module 106 does not implement the addition counting function; therefore, the signal counting function of the second counting module 102 can realize the safe and stable constant current control function for the object 20 to be controlled, which is beneficial to simplifying the constant current control step of the object 20 to be controlled.

The digital-to-analog conversion module 107 is connected to the second counting module 106 and the power supply loop of the object 20 to be controlled, and is configured to perform digital-to-analog conversion on the digital control signal to obtain an analog control signal, so that the operating current of the object 20 to be controlled is kept constant.

Optionally, the digital control signal is used to adjust the operating current of the object 20 to be controlled, so that the operating current of the object 20 to be controlled can be maintained within a preset fluctuation error within a preset time period, and the object 20 to be controlled keeps a constant current state; the digital-to-analog conversion module 107 has high signal conversion accuracy, and the analog control signal output by the digital-to-analog conversion module 107 has a continuous adjustment function, so that the running current of the object 20 to be controlled can maintain continuous variation, and the current control response accuracy of the object 20 to be controlled is improved; the object 20 to be controlled can be always maintained in a constant current state, and further, after the digital-to-analog conversion is performed on the signal, the continuous and stable current control function for the object 20 to be controlled can be realized in the embodiment, and the constant current control circuit 10 has efficient and stable constant current control performance for the object 20 to be controlled.

In the structural schematic of the constant current control circuit 10 shown in fig. 1, the constant current control circuit 10 has a relatively simplified circuit module structure, and realizes real-time control response performance for the constant current state of the object 20 to be controlled; the sampling voltage of the object 20 to be controlled is directly accessed through the detection module 104, whether the object 20 to be controlled is in a constant current state or not can be directly detected according to the difference condition between the first sampling voltage and the second reference voltage, and when the object 20 to be controlled is not in the constant current state, the operation current self-adaptive adjustment function of the object 20 to be controlled is realized after the voltage detection signal generated by the detection module 104 is converted, so that the operation current of the object 20 to be controlled can be always maintained in the constant current state, the constant current control precision and stability of the object 20 to be controlled are greatly guaranteed, and the application range is extremely wide; therefore, the constant current control circuit 10 only needs to set a corresponding constant current state judgment criterion through the reference voltage to realize a function of pre-detecting and judging the constant current state of the object 20 to be controlled, thereby simplifying the judgment steps and the process of the constant current state of the object 20 to be controlled, accurately acquiring the constant current state of the object 20 to be controlled according to the fluctuation condition of the sampling voltage of the object 20 to be controlled, and avoiding the large electric energy loss of the object 20 to be controlled in the constant current control process; therefore, the constant current control circuit 10 in the embodiment can be universally applied to various different industrial technical fields, the constant current state of the object to be controlled is detected accurately and in real time, and the current state of the object to be controlled 20 is adjusted in real time after the signal is converted and processed, so that the constant current control accuracy and efficiency of the object to be controlled 20 are improved, the constant current control requirements of users are met, and the compatibility is wide; the problems that the conventional technology generates large electric energy loss in the constant current control process of an electronic product, so that the constant current control steps of the electronic product are complex, the constant current control precision and the constant current control efficiency of the electronic product are low, and the electric energy safety of the electronic product is reduced are effectively solved.

As an alternative embodiment, the magnitudes of the second reference voltage and the first reference voltage satisfy the following relationship:

A＝B*C (1)

in the above formula (1), A is the second reference voltage, B is the first reference voltage, and C is a real number between 0.1 and 1.

Illustratively, B is 0.9.

The second reference voltage and the first reference voltage present a proportional relationship, which can be obtained by the above formula (1); therefore, after the first sampling voltage is accessed through the detection module 104, the current fluctuation amplitude of the object 20 to be controlled can be accurately identified according to the second reference voltage, the constant current state of the object 20 to be controlled can be quantitatively determined according to the difference between the sampling voltage of the object 20 to be controlled and the second reference voltage, the detection module 104 can accurately and efficiently identify the constant current state of the object 20 to be controlled, and then the pre-detection determination mode for the object 20 to be controlled is realized through the comparison result between the first sampling voltage and the second reference voltage, so that the constant current control steps and the constant current control process for the object 20 to be controlled are simplified, and the application range of the constant current control circuit 10 is improved.

As an optional implementation manner, fig. 2 shows a schematic circuit structure of the detection module 104 provided in this embodiment, please refer to fig. 2, where the detection module 104 includes: the first comparator unit 1041 is connected to the voltage sampling module 102, the second counting module 106, and the first counting module 105, and is configured to access the first sampling voltage, compare the first sampling voltage with a third reference voltage to determine whether the object 20 to be controlled is in a constant current state, and generate a first voltage detection signal if the object 20 to be controlled is in a non-constant current state.

Optionally, referring to fig. 2, the first comparator unit 1041 includes a first comparator Cmp1, wherein a non-inverting input terminal of the first comparator Cmp1 is connected to the third reference voltage, an inverting input terminal of the first comparator Cmp1 is connected to the voltage sampling module 102, and an output terminal of the first comparator Cmp1 is connected to the first counting module 105 and the second counting module 106; the first comparator Cmp1 has a signal comparison function, so when the first comparator Cmp1 is respectively connected to the first sampling voltage and the third reference voltage, the first comparator Cmp1 can implement the voltage comparison function and generate a corresponding constant current state detection result, thereby ensuring the detection precision and the detection efficiency of the constant current state of the object 20 to be controlled; therefore, the first comparator unit 1041 utilizes the voltage comparison function of the comparator to determine whether the object 20 to be controlled is in a constant current state in real time, and the operation process is simple.

The second comparator unit 1042 is connected to the voltage sampling module 102 and the first counting module 105, and configured to access the first sampling voltage, compare the first sampling voltage with a fourth reference voltage to determine whether the object 20 to be controlled is in a constant current state, and generate a second voltage detection signal if the object 20 to be controlled is in a non-constant current state.

Wherein the first reference voltage and the fourth reference voltage are different.

Optionally, referring to fig. 2, the second comparator unit 1042 includes a second comparator Cmp2, a positive phase input terminal of the second comparator Cmp2 is connected to the fourth reference voltage VREF2, a negative phase input terminal of the second comparator Cmp2 is connected to the voltage sampling module 102, an output terminal of the second comparator Cmp2 is connected to the first counting module 105, when the second comparator Cmp2 is connected to the fourth reference voltage VREF2 and the first sampling voltage, a voltage comparison function of the comparator is utilized, so that a magnitude relationship between the fourth reference voltage VREF2 and the first sampling voltage is obtained, so as to accurately measure a current fluctuation condition of the object 20 to be controlled, and a real-time and efficient control function for a non-constant current state of the object 20 to be controlled can be performed according to the second voltage detection signal output by the second comparator Cmp2, so that flexibility is high.

In the present embodiment, the second reference voltage includes a third reference voltage and a fourth reference voltage; and then the third reference voltage and the fourth reference voltage can be combined to respectively identify whether the object 20 to be controlled is in a constant current state, so that the detection precision of the constant current state is improved.

As an alternative embodiment, the third reference voltage satisfies the following relationship:

D＝B*E (2)；

in the above formula (2), D is the third reference voltage, B is the first reference voltage, and E is a real number between 0.1 and 1.

The fourth reference voltage satisfies the following relationship:

F＝B*G (3)；

in the above formula (3), F is a fourth reference voltage, and G is a real number between 0.1 and 1.

Where E is not equal to G.

In this embodiment, the first comparator unit 1041 and the second comparator Cmp2 are respectively connected to the first sampling voltage output by the voltage sampling module 102, and the constant current state of the object 20 to be controlled is detected and controlled accurately and in real time, so that the detection efficiency and the constant current control accuracy of the object 20 to be controlled are greatly ensured, the current of the object 20 to be controlled can be monitored in high accuracy and real time through the first voltage detection signal and the second voltage detection signal, and the detection error of the constant current state of the object 20 to be controlled is avoided; according to the formulas (2) and (3), if the third reference voltage and the fourth reference voltage are different, the third reference voltage and the fourth reference voltage are used to set corresponding judgment threshold values respectively, so as to monitor the current fluctuation state of the object 20 to be controlled more comprehensively, and improve the current monitoring sensitivity and accuracy of the object 20 to be controlled; furthermore, the constant current control circuit 10 can monitor the constant current state of various types of objects to be controlled, so as to achieve the function of constant current control, comprehensively ensure the electric energy safety of the objects to be controlled 20, and have high practical value.

To better explain the principle of the pre-detection judgment about the constant current state of the object to be controlled in this embodiment, a specific application scenario is described below with reference to fig. 1 to 5 to describe the process of judging the constant current state of the object to be controlled 20, where fig. 3 to 5 respectively show different magnitude relationships between the first sampling voltage and the third and fourth reference voltages output by the voltage sampling module 102, and specifically, the following:

in fig. 3, in a preset time period, the first sampling voltage is smaller than the third reference voltage and the fourth reference voltage, at this time, the level of the output terminal of the first comparator Cmp1 and the level of the output terminal of the second comparator Cmp2 are both high levels, the detection module 104 determines that the object 20 to be controlled is not in a constant current state, and then the operating current of the object 20 to be controlled has a large fluctuation, the first comparator Cmp1 and the second comparator Cmp2 respectively output the first voltage detection signal and the second voltage detection signal to the first counting module 105, and then the internal circuit modules of the constant current control circuit 10 have high conversion accuracy and conversion efficiency for signals, so as to realize a constant current control function for the object 20 to be controlled, and guarantee the current control response performance for the object 20 to be controlled.

In fig. 4, in a preset time period, the first sampling voltage is less than the third reference voltage, and the first sampling voltage is greater than the fourth reference voltage, the level of the output end of the first comparator Cmp1 is a high level, and the level of the output end of the second comparator Cmp2 is a low level, which indicates that although the operating current of the object to be controlled 20 fluctuates, the fluctuation amount of the operating current of the object to be controlled 20 is within a preset constant current error range, at this time, the object to be controlled 20 is still in a constant current state, the detection module 104 does not output a voltage detection signal, accordingly, the constant current control circuit 10 does not adjust the operating current of the object to be controlled 20, the operating current of the object to be controlled 20 still maintains the original operating state, and the electrical energy safety and the constant current control efficiency of the object to be controlled 20 are improved.

In fig. 5, in a preset time period, the first sampling voltage is greater than the third reference voltage and the fourth reference voltage, and at this time, the level of the output end of the first comparator Cmp1 and the level of the output end of the second comparator Cmp2 are both low levels, which indicates that the object 20 to be controlled is in a completely constant current state, the operating current of the object 20 to be controlled remains completely unchanged, the detection module 104 does not output a voltage detection signal, the constant current control circuit 10 does not take a constant current control measure for the object 20 to be controlled, and at this time, the second counting module 106 performs subtraction counting to maintain the constant current state of the object 20 to be controlled, so that the operating current stability and safety of the object 20 to be controlled are further ensured.

Therefore, according to the application scenario, the constant current state of the object 20 to be controlled can be accurately identified according to the magnitude relationship between the first sampling voltage and each reference voltage, and the steps and the process for judging the constant current state of the object 20 to be controlled are simplified.

As an alternative implementation, fig. 6 shows a schematic structure of the first counting module 105 provided in this embodiment, please refer to fig. 6, in which the first counting module 105 includes: a first logic operation unit 1051, an oscillation unit 1052, a first counting unit 1053 and a first inversion unit 1054; the first logic operation unit 1051 is connected to the first comparator unit 1041 and the second comparator unit 1042, and configured to perform an and logic operation on the first voltage detection signal and the second voltage detection signal to obtain a first trigger signal.

Optionally, the first logic operation unit 1051 includes a first and gate, a first input of the first and gate is connected to the first comparator unit 1041, a second input of the first and gate is connected to the second comparator unit 1042, and an output end of the first and gate is configured to output a first trigger signal; therefore, after the first comparator unit 1041 and the second comparator unit 1042 detect the constant current state of the object 20 to be controlled, the constant current state of the object 20 to be controlled can be accurately controlled in real time by combining the first voltage detection signal and the second voltage detection signal, and the constant current control step is accelerated according to the first trigger signal.

The oscillation unit 1052 is configured to generate an oscillation signal.

The oscillation frequency can be provided for the constant current control process through the oscillation signal so as to keep the stability and the anti-interference performance of the constant current control function, the oscillation signal output by the oscillation unit 1052 drives the first counting module 105 to enter a working state, the first counting module 105 realizes accurate control response performance for the non-constant current state of the object 20 to be controlled, and the constant current control circuit 10 has a higher application range and flexibility.

The first counting unit 1053 is connected to the first logic operation unit 1051, the oscillating unit 1052 and the second counting module 106, and configured to reset according to the first trigger signal and the oscillating signal to obtain a first level signal.

The first counting unit 1053 has a level counting function, when the object 20 to be controlled is in a constant current state, the detection module 104 does not output a voltage detection signal, and when the first counting unit 1053 is in the level counting state, the constant current control circuit 10 does not realize the constant current control function on the object 20 to be controlled; when the object 20 to be controlled is not in the constant current state, the first logic operation unit 1051 obtains a first trigger signal according to the first voltage detection signal and the second voltage detection signal, at this time, the first counting unit 1053 realizes the reset function, and does not count, and the constant current control function of the object 20 to be controlled can be realized through the first level signal output by the first counting unit 1053; therefore, the first counting unit 1053 has high signal conversion efficiency and control accuracy, and the electric energy safety of the object 20 to be controlled is guaranteed.

The first inverting unit 1054 is connected to the first counting unit 1053 and the second counting module 106, and configured to invert the first level signal to obtain a counting trigger signal.

Optionally, the first inverting unit 1054 includes a first inverter, wherein an input end of the first inverter is connected to the first counting unit 1053, and an output end of the first inverter is connected to the second counting module 106, so that when the object 20 to be controlled is in a non-constant current state, the first inverter will implement a signal level inverting function; and then the counting trigger signal output by the first inverting unit 1054 has a specific level state, and the counting trigger signal is output to the second counting module 106 through the first inverting unit 1054, so that the internal signal processing precision and the processing efficiency of the constant current control circuit 10 are ensured, and the electric energy stability of the object 20 to be controlled is greatly improved.

As an optional implementation manner, fig. 7 shows a structural schematic diagram of the second counting module 106 provided in this embodiment, please refer to fig. 7, where the second counting module 106 includes: a second logical operation unit 1061, a third logical operation unit 1062, a fourth logical operation unit 1063, and a second count unit 1064; the second logical operation unit 1061 is connected to the first counting unit 1053, and configured to perform an and logical operation on the first level signal and the clock signal to obtain a first control signal.

Illustratively, the clock signal is generated by a clock circuit in the conventional art.

Optionally, the second logic operation unit 1061 includes a second and gate, where a first input end of the second and gate is used for accessing the first level signal, a second input end of the second and gate is used for accessing the clock signal, and an output end of the second and gate is used for outputting the first control signal; wherein the clock signal includes level control information, and then the second and gate combines the level change states of the first level signal and the clock signal to output the first control signal, wherein the first control signal has a specific level state, and the precision and efficiency of signal conversion are guaranteed by the second logic operation unit 103.

The third logical operation unit 1062 is connected to the first inverting unit 1054 and the first comparator unit 1041, and configured to perform an and logical operation on the count trigger signal and the first voltage detection signal to obtain a second control signal.

Optionally, the third logical operation unit 1062 includes a third and gate, a first input end of the third and gate is configured to access the count trigger signal, a second input end of the third and gate is configured to access the first voltage detection signal, and an output end of the third and gate is configured to output a second control signal; therefore, in this embodiment, the level processing function is realized by counting the trigger signal and the first voltage detection signal, and the third logic operation unit 1062 has a signal conversion response performance; the second counting module 106 can obtain the non-constant current control of the object 20 to be controlled in real time, so as to drive a constant current control function with higher precision for the object 20 to be controlled, and a feedback adjustment function for the current state of the object 20 to be controlled.

The fourth logical operation unit 1063 is connected to the second logical operation unit 1061 and the third logical operation unit 1062, and configured to perform an or logical operation on the first control signal and the second control signal to obtain a third control signal.

Optionally, the fourth logical operation unit 1063 includes: the first input end of the fourth and gate is used for accessing the first control signal, the second input end of the fourth and gate is used for accessing the second control signal, the output end of the fourth and gate is used for outputting the third control signal, and then the stable constant current control function of the object 20 to be controlled can be achieved through the third control signal, so that the running current of the object 20 to be controlled can be rapidly recovered to a stable state, the omnibearing and efficient constant current control function of the object 20 to be controlled is achieved, and the constant current control circuit 10 has higher control flexibility.

The second counting unit 1064 is connected to the fourth logic operation unit 1063, the first inverting unit 1054 and the digital-to-analog conversion module 107, and configured to add and count the third control signal according to the count trigger signal, and obtain the digital control signal.

The second counting unit 1064 has a level counting function, so as to implement adaptive adjustment on the running current of the object 20 to be controlled, thereby ensuring the control response accuracy of the object 20 to be controlled; illustratively, when the object 20 to be controlled is in a non-constant current state, the second counting unit 1064 performs a self-adding operation according to the counting trigger signal, a binary number "00000000" is changed from a self-adding one bit to "00000001", and the digital control signal output by the fourth logic operation unit 1063 contains corresponding constant current control information; on the contrary, when the object 20 to be controlled is in the constant current state, the second counting unit 1064 cannot receive the counting trigger signal, and the second counting unit 1064 performs a self-decreasing operation, at this time, the operating current of the object 20 to be controlled is consistent with the original state, and at this time, the constant current control circuit 10 does not perform constant current control on the operating current of the object 20 to be controlled; therefore, the present embodiment can perform accurate real-time level counting on the signal in real time by the second counting unit 1064 to improve the efficiency and accuracy of the constant current control on the object 20 to be controlled.

As an alternative implementation, fig. 8 shows another structural schematic of the detection module 104 provided in this embodiment, and compared with the structural schematic of the detection module 104 in fig. 2, the detection module 104 in fig. 8 further includes: a first voltage reference unit 1043 and a second voltage reference unit 1044; the first voltage reference unit 1043 is connected to the first comparator unit 1041, and is configured to generate a third reference voltage.

The second voltage reference unit 1044 is connected to the second comparator unit 1042 and configured to generate a fourth reference voltage.

Illustratively, E is 0.98; g is 0.9.

The third reference voltage and the fourth reference voltage respectively provide voltage reference information for the constant current state judgment process, so that the constant current state of the object 20 to be controlled can be identified under a more standard judgment standard by setting the third reference voltage and the fourth reference voltage, so that the constant current control precision and the constant current control efficiency of the object 20 to be controlled are improved; therefore, the internal electric energy of the constant current control circuit 10 has higher stability and safety, and the current fluctuation state of the object 20 to be controlled can be monitored in real time by combining the voltage comparison result of the first comparator unit 1041 and the voltage comparison result of the second comparator unit 1042, so as to identify the non-constant current state of the object 20 to be controlled, and improve the signal conversion stability and the signal conversion efficiency inside the constant current control circuit 10.

Fig. 9 shows another structural schematic of the constant current control circuit 10 provided in the present embodiment, and compared with the structural schematic of the constant current control circuit 10 in fig. 1, the constant current control circuit 10 in fig. 9 further includes: and the second switch module 108, the second switch module 108 being connected to the digital-to-analog conversion module 107, being connected in series in the power supply loop of the object 20 to be controlled, and being configured to adjust the operating current of the object 20 to be controlled according to the analog control signal.

The second switch module 108 has a current transmission function, and adjusts the operating current of the object 20 to be controlled by controlling the current transmission characteristic of the second switch module 108, so that the operating current of the object 20 to be controlled is kept constant, and the operating current of the object 20 to be controlled has higher control response speed and accuracy; therefore, when the object 20 to be controlled is not in the constant current state, the analog control signal is output to the second switch module 108 through the digital-to-analog conversion module 904, for example, when the analog control signal has different level states in one period to change the current conduction performance of the second switch module 108, the power supply loop of the object 20 to be controlled has operating currents with different amplitudes, so that a high-efficiency current control function for the object 20 to be controlled is realized, the constant current control circuit 10 has higher constant current control efficiency and control accuracy for the object 20 to be controlled, so that the operating current of the object 20 to be controlled is always in a safer and more stable state, and the application range and stability of the constant current control circuit 10 are improved.

As an alternative embodiment, the second switch module 108 includes a first switch tube, a control end of the first switch tube is connected to the digital-to-analog conversion module 107, and a first conducting end of the first switch tube and a second conducting end of the first switch tube are connected in series in the power supply loop of the object 20 to be controlled.

Illustratively, the first switch tube is a MOS tube or a triode, so the second switch module 108 has a simplified circuit structure.

After digital-to-analog conversion is performed on the signal by the digital-to-analog conversion module 107, an analog control signal is obtained, wherein the analog control signal is used as an analog quantity, and the analog control signal has a switch control function; when the operation current of the object 20 to be controlled is in a non-constant current state, the current conduction characteristic between the first conduction end and the second conduction end of the first switch tube is controlled through the analog control signal, the operation current of the object 20 to be controlled can be maintained in a stable and safe state, the electric energy safety of the object 20 to be controlled is greatly guaranteed, and the object 20 to be controlled has higher constant current control quality and constant current control efficiency.

As an optional implementation manner, fig. 10 shows a schematic circuit structure of the operational amplification module 103 provided in this embodiment, please refer to fig. 10, where the operational amplification module 103 includes: a first resistor R1 and an operational amplifier OP 1.

The first end of the first resistor R1 is used for receiving the first reference voltage, the second end of the first resistor R1 is connected to the non-inverting input end of the operational amplifier OP1, the inverting input end of the operational amplifier OP1 is connected to the voltage sampling module 102, and the output end of the operational amplifier OP1 is connected to the first switching module 101.

After the first reference voltage and the first sampling voltage are compared and amplified through the operational amplifier OP1, the constant current control function of the object to be controlled 20 can be guaranteed in real time, the operational amplification module 103 has a simplified circuit structure, and the object to be controlled 20 can be connected with stable electric energy, so that the circuit control function requirements of technicians are met, and the current control step of the object to be controlled 20 is simplified.

The constant current control circuit 10 in this embodiment can perform safe and reliable constant current control on the object 20 to be controlled, so that the electric energy stability and the electric energy control quality of the object 20 to be controlled are improved; by comparing the first sampling voltage with the second reference voltage, the function of pre-detection judgment on the constant current state of the object 20 to be controlled can be realized, the steps of voltage division again on the sampling voltage of the object 20 to be controlled and the like are not needed, the detection step of the constant current state is simplified, and the large electric energy loss in the detection process of the constant current state of the object 20 to be controlled is avoided; when it is determined that the object 20 to be controlled is not in the constant current state, a voltage detection signal is generated by the detection module 901, and after the voltage detection signal is converted and processed, the current transmission characteristic of the second switch module 108 is controlled, and the operating current in the power supply loop of the object 20 to be controlled is adjusted, so that the operating current of the object 20 to be controlled is maintained in a stable and safe state, thereby realizing an efficient and stable constant current control function for the object 20 to be controlled, having high control response precision and stability, improving the constant current control precision and reliability for the object 20 to be controlled, and meeting the actual circuit control requirements of users; the problems that in the constant current control process of the traditional technology, large electric energy loss is generated, so that the steps of electric energy control of electronic products are complex, electric energy in the constant current control process is in an unstable and unsafe state, and the compatibility and the practical value are low are effectively solved.

Fig. 11 shows a structural schematic of the constant current control system 110 provided in this embodiment, please refer to fig. 11, in which the constant current control system 110 includes an object 20 to be controlled and the constant current control circuit 10 as described above, the constant current control circuit 10 is connected to the object 20 to be controlled, and the constant current control circuit 10 is used for performing constant current control on the object 20 to be controlled; and the operation current of the object 20 to be controlled can be maintained in a stable state by the constant current control circuit 90.

Optionally, the object 20 to be controlled comprises a light emitting module; the constant current control circuit 10 can perform constant current control on the light emitting module, so that the light emitting module is in a safer and more stable light emitting state to meet the actual visual requirements of users.

Optionally, the light-emitting module comprises at least one lamp bead, and the lamp bead is a red lamp bead, a blue lamp bead or a green lamp bead; and then can send various types of light sources through the light emitting module, guaranteed the light source control stability and the flexibility of constant current control system 110.

With reference to the embodiments of fig. 1 to 10, in the present embodiment, the constant current control circuit 10 is applied to the light source adjustment process, so as to ensure the stability and flexibility of the light source control process of the light emitting module; in the constant current control circuit 10, the voltage sampling module 102 is connected in series to a power supply loop of the light emitting module, and after sampling the output voltage of the light emitting module, the detection module 104 detects whether the light emitting module is in a constant current state according to a comparison result between the first sampling voltage and the first reference voltage, and when it is determined that the light emitting module is not in the constant current state, the constant current control step is started for the light emitting module.

The detection module 104 has a constant current state detection function, and when the light-emitting module is connected with electric energy through the power supply loop, the light-emitting module is connected with the power supply energy to maintain a normal working state; therefore, the detection module 104 is connected with the first sampling voltage, and the difference value between the first sampling voltage and the second reference voltage realizes the function of pre-detecting and judging the constant current state, thereby not only ensuring the judgment precision of the constant current state of the light-emitting module, but also simplifying the constant current control step of the light-emitting module and avoiding larger errors in the process of detecting the constant current state of the light-emitting module.

The constant current control system 110 in this embodiment can emit a light source with preset brightness and preset color, and the constant current control circuit 10 can perform a pre-detection judgment operation on the voltage information of the object 20 to be controlled, so as to judge whether the object 20 to be controlled is in a constant current state; when the object 20 to be controlled is not in the constant current state, the constant current control circuit 90 performs constant current control on the object 20 to be controlled so as to ensure the light source control stability and safety of the object 20 to be controlled; therefore, the constant current control system 110 in this embodiment has higher light source control efficiency and safety, prevents a larger electric energy loss from occurring in the light source control process, further improves the light source control efficiency and response accuracy of the constant current control system 110, so that the constant current control system 110 can be applied to various different industrial technical fields, realizes a simple, convenient and sensitive adjustment function for the light source control process, brings great convenience to the use of users, and has higher practical value; the method has an extremely important promoting effect on the improvement of the light source control efficiency in the field, and effectively solves the problems that the constant current control system in the traditional technology generates large electric energy loss in the process of controlling the light source, the steps of controlling the light source are complex, the quality of displaying the light source is reduced, the light source control requirement of a user cannot be met, and great inconvenience is brought to the use of the user.

Various embodiments are described herein for various devices, circuits, apparatuses, systems, and/or methods. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.

Reference throughout the specification to "various embodiments," "in an embodiment," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic illustrated or described in connection with one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments without presuming that such combination is not an illogical or functional limitation. Any directional references (e.g., plus, minus, upper, lower, upward, downward, left, right, leftward, rightward, top, bottom, above …, below …, vertical, horizontal, clockwise, and counterclockwise) are used for identification purposes to aid the reader's understanding of the present disclosure, and do not create limitations, particularly as to the position, orientation, or use of the embodiments.

Although certain embodiments have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. Joinder references (e.g., attached, coupled, connected, and the like) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. Thus, connection references do not necessarily imply that two elements are directly connected/coupled and in a fixed relationship to each other. The use of "for example" throughout this specification should be interpreted broadly and used to provide non-limiting examples of embodiments of the disclosure, and the disclosure is not limited to such examples. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from the disclosure.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims

1. A constant current control circuit is connected with an object to be controlled, and is characterized by comprising:

2. The constant current control circuit according to claim 1, wherein the detection module comprises:

3. The constant current control circuit according to claim 2, wherein the third reference voltage satisfies the following relationship:

D＝B*E；

the fourth reference voltage satisfies the following relationship:

F＝B*G；

where E is not equal to G.

4. The constant current control circuit according to claim 2, wherein the first counting module comprises:

an oscillation unit configured to generate the oscillation signal;

5. The constant current control circuit according to claim 4, wherein the second counting module comprises:

6. The constant current control circuit according to claim 2, wherein the detection module further comprises:

7. The constant current control circuit according to claim 3, wherein E is 0.98;

the G is 0.9.

8. The constant current control circuit according to claim 1, further comprising:

9. The constant current control circuit according to claim 8, wherein the operational amplification module comprises:

a first resistor and an operational amplifier;

10. A constant current control system, comprising:

an object to be controlled; and

the constant current control circuit according to any one of claims 1 to 9, the constant current control circuit being connected to the object to be controlled, the constant current control circuit being configured to perform constant current control on the object to be controlled; wherein, the object to be controlled comprises a light-emitting module.