CN211792163U - Load drive circuit and load drive control circuit - Google Patents
Load drive circuit and load drive control circuit Download PDFInfo
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- CN211792163U CN211792163U CN202020850250.5U CN202020850250U CN211792163U CN 211792163 U CN211792163 U CN 211792163U CN 202020850250 U CN202020850250 U CN 202020850250U CN 211792163 U CN211792163 U CN 211792163U
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Abstract
The utility model discloses a load drive circuit and load drive control circuit, wherein, load drive control circuit includes input detection circuitry and output control circuit. The input detection circuit is used for acquiring a detection signal representing an input voltage. The input end of the output control circuit is coupled with the output end of the input detection circuit, and the output end of the output control circuit is coupled with a power switch in the load driving circuit. The output control circuit includes a first comparison circuit and an output reference adjustment circuit. The input end of the output reference regulating circuit is coupled with the output end of the first comparing circuit, and the output reference regulating circuit regulates the output voltage reference value and/or the output current reference value of the load driving circuit according to the comparison result of the first comparing circuit. The utility model provides a load drive circuit and load drive control circuit can ensure that output signal's reference signal follows input voltage's change and corresponding change and effectively restrain the ripple to load drive circuit's influence to realize that LED does not have the stroboscopic.
Description
Technical Field
The utility model belongs to the technical field of the electronic circuit, a control circuit is related to, especially, relate to a load drive circuit and load drive control circuit.
Background
In the application of a class of LED lamps, the LED lamp beads can be connected with resistors in series to serve as loads, and a driving power supply is required to have constant voltage and constant current functions. The constant voltage and constant current output characteristics of the driving power supply are generally represented by an I-V curve, as shown in fig. 1. The external characteristic of the series resistance of the LED lamp bead can be expressed by the following formula V-V0 + I R.
Fig. 2 and 3 are external characteristic curve diagrams of the series resistance of the conventional LED lamp beads; in fig. 2 and 3, a dotted line represents output characteristics of the driving power supply, a solid line except for a coordinate axis represents LED lamp bead load characteristics, and an intersection point of the dotted line and the solid line is an operating point when the driving power supply carries the LED lamp bead load.
The output characteristic curve of a general LED driving power supply does not change along with the input voltage. Such a drive current does not present a problem with LED operation if the power supply uses a sufficient amount of bus capacitance; if the power supply uses a small bus capacitor, this control method will cause the LED to strobe.
Fig. 4 and 5 are schematic diagrams of voltage ripples formed by the conventional LED lamp when low voltage is input; as shown in fig. 4 and 5, when a low voltage is input, a power frequency voltage ripple generated on the BUS may cause the driving power supply to shut down under a low voltage, and may also cause a considerable ripple amount to be superimposed on the output current/output voltage; both of these conditions can cause the LED to strobe.
In view of the above, there is a need to design a new control circuit to overcome at least some of the above-mentioned disadvantages of the existing control circuits.
SUMMERY OF THE UTILITY MODEL
The utility model provides a load drive circuit and load drive control circuit can ensure that output signal's reference signal follows input signal's change and corresponding change and effectively restrain the ripple to load drive circuit's influence to realize that LED does not have the stroboscopic.
For solving the technical problem, according to the utility model discloses an aspect adopts following technical scheme:
the utility model provides a load drive control circuit is applied to load drive circuit, and load drive control circuit includes:
the input detection circuit is used for acquiring a detection signal representing input voltage; and
the input end of the output control circuit is coupled with the output end of the input detection circuit, and the output end of the output control circuit is coupled with a power switch in the load driving circuit and used for controlling the output power of the load driving circuit according to the detection signal; the output control circuit comprises a first comparison circuit and an output reference regulating circuit, wherein a first input end of the first comparison circuit is coupled with an output end of the input detection circuit, and a second input end of the first comparison circuit is coupled with a first detection reference signal end; the input end of the output reference regulating circuit is coupled with the output end of the first comparing circuit, and the output reference regulating circuit regulates the output voltage reference value and/or the output current reference value of the load driving circuit according to the comparison result of the first comparing circuit.
In an embodiment of the present invention, a third input terminal of the first comparing circuit is coupled to the second detection reference signal terminal; when the input voltage is lower than a first set voltage, the output control circuit reduces an output voltage reference value and/or an output current reference value of the load driving circuit, so that the output power of the load driving circuit is reduced; when the input voltage is lower than a second set voltage, the output control circuit controls the output voltage reference value and/or the output current reference value of the load driving circuit to be maintained in a second reference interval, and the second set voltage is smaller than the first set voltage.
In an embodiment of the present invention, when the input voltage is between the first setting voltage and the second setting voltage, the output control circuit controls the output voltage reference value and/or the output current reference value of the load driving circuit to decrease with the decrease of the input voltage.
In an embodiment of the present invention, the input detection circuit obtains the detection signal by detecting the on-time of the power switch in the load driving circuit.
In an embodiment of the present invention, a third input terminal of the first comparing circuit is coupled to the second detection reference signal terminal; the detection signal is the conduction time of the power switch, the first detection reference signal is the first conduction time, and the second detection reference signal is the second conduction time; when the on-time is between a first on-time and a second on-time, the output control circuit controls the output voltage reference value and/or the output current reference value of the load driving circuit to be reduced along with the increase of the on-time; the first on-time is less than the second on-time.
In an embodiment of the present invention, when the on-time is lower than the first on-time, the output control circuit is configured to control the output voltage reference value and/or the output current reference value of the load driving circuit to be maintained within the first reference interval.
In an embodiment of the present invention, when the on-time is higher than the second on-time, the output control circuit is configured to control the output voltage reference value and/or the output current reference value of the load driving circuit to be maintained within the second reference interval.
In an embodiment of the present invention, the load driving control circuit includes a current source, a first capacitor, a second capacitor, a third capacitor, a first switch, a second switch, a third switch, a voltage-controlled current source, and a comparison circuit;
the output end of the current source is respectively coupled with the first end of the first switch, the first end of the first capacitor and the first end of the second switch; the second end of the second switch is coupled to the first end of the second capacitor and the first end of the third switch respectively; the second end of the third switch is respectively coupled with the first end of the third capacitor and the input end of the voltage control current source; the non-inverting input end of the comparison circuit is respectively coupled with the output end of the voltage control current source and the peak current sampling end; a first resistor is also coupled between the non-inverting input end and the peak current sampling end of the comparison circuit; the inverting input end of the comparison circuit is coupled with a preset reference voltage;
the second end of the first switch, the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor are respectively coupled to the ground.
The utility model provides a load driving circuit, which comprises a load driving control circuit and a power switch; the output end of the load driving control circuit is coupled with the power switch.
The beneficial effects of the utility model reside in that: the utility model provides a load drive circuit and load drive control circuit can ensure that output signal's reference signal follows input voltage's change and corresponding change and effectively restrain the ripple to load drive circuit's influence to realize that LED does not have the stroboscopic.
Drawings
Fig. 1 is a constant voltage and constant current output characteristic curve diagram of a conventional LED lamp driving power supply.
Fig. 2 is an external characteristic curve diagram (first situation) of the series resistance of the conventional LED lamp bead.
Fig. 3 is an external characteristic curve diagram (second case) of the conventional LED lamp bead series resistance.
Fig. 4 is a schematic diagram of a power frequency voltage ripple generated on a BUS when a low voltage is input to a conventional LED lamp.
Fig. 5 is a schematic diagram of a conventional LED lamp with ripple superimposed on output current/output voltage at low voltage input.
Fig. 6 is a schematic diagram illustrating adjustment of an output current reference value in a load driving control circuit according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of adjusting the reference value of the output voltage in the load driving control circuit according to an embodiment of the present invention.
Fig. 8 is a schematic diagram illustrating adjustment of reference values of output current and output voltage in a load driving control circuit according to an embodiment of the present invention.
Fig. 9 is a schematic diagram of a curve of a peak current reference value varying with the on-time of the power switch according to an embodiment of the present invention.
Fig. 10 is a circuit diagram of a load driving control circuit according to an embodiment of the present invention.
Fig. 11 is a timing diagram corresponding to the control circuit shown in fig. 10 according to an embodiment of the present invention.
Fig. 12 is a flowchart illustrating a load driving control method according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
For further understanding of the present invention, preferred embodiments of the present invention will be described below with reference to examples, but it should be understood that these descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the claims of the present invention.
The description in this section is for exemplary embodiments only, and the present invention is not limited to the scope of the embodiments described. The same or similar prior art means and some technical features of the embodiments are mutually replaced and are also within the scope of the description and the protection of the invention.
"coupled" or "connected" in this specification includes both direct and indirect connections, such as through some active device, passive device, or electrically conductive medium; but also may include connections through other active or passive devices, such as through switches, follower circuits, etc., that are known to those skilled in the art for achieving the same or similar functional objectives.
The utility model provides a load drive control circuit, it includes input detection circuitry and output control circuit. The input detection circuit is used for acquiring a detection signal representing an input voltage. The input end of the output control circuit is coupled with the output end of the input detection circuit, the output end of the output control circuit is coupled with a power switch in the load driving circuit, and the output control circuit is used for controlling the output power of the load driving circuit according to the detection signal. The output control circuit comprises a first comparison circuit and an output reference regulating circuit, wherein a first input end of the first comparison circuit is coupled with an output end of the input detection circuit, and a second input end of the first comparison circuit is coupled with a first detection reference signal end. The input end of the output reference regulating circuit is coupled with the output end of the first comparing circuit, and the output reference regulating circuit regulates the output voltage reference value and/or the output current reference value of the load driving circuit according to the comparison result of the first comparing circuit. In an embodiment of the present invention, when the input voltage is lower than the first setting voltage, the output control circuit reduces the output voltage reference value and/or the output current reference value of the load driving circuit, thereby reducing the output power of the load driving circuit. When the input voltage is lower than the second set voltage, the output control circuit controls the output voltage reference value and/or the output current reference value of the load driving circuit to be maintained in a second reference interval, and the second set voltage is smaller than the first set voltage.
As shown in fig. 6, an embodiment of the present invention provides a load driving control circuit, which is applied to a load driving circuit. The load drive control circuit includes an input detection circuit and an output control circuit. The input detection circuit is used for acquiring a detection signal representing an input voltage. The output control circuit is coupled to the output end of the input detection circuit and is used for controlling the output power of the load driving circuit according to the detection signal. When the input voltage is higher than the first setting voltage, that is, the load drive control circuit is in a High-voltage input state, as shown in High Line of fig. 6, the output control circuit may keep the output voltage reference value and/or the output current reference value of the load drive circuit unchanged. That is, when the input voltage is higher than the first setting voltage, the output voltage reference value is kept constant in the constant voltage drive circuit, the output current reference value is kept constant in the constant current drive circuit, and the output voltage reference value and the output current reference value are kept constant in the constant voltage constant current drive circuit. When the input voltage is lower than the first setting voltage, that is, the load drive control circuit is in a Low-voltage input state, the output control circuit changes the output current reference value of the load drive circuit from Io1 to Io2, and reduces the output current reference value to reduce the output power of the load drive circuit, as shown in Low Line of fig. 6. When the input voltage is lower than the first set voltage, the output current is reduced by reducing the reference value of the output current so as to reduce the ripple quantity of the output current and realize that the LED has no stroboflash. When the output current reference value is changed from Io1 to Io2, the current output current of the load driving circuit is still Io1, at this time, overcurrent protection (OCP for short) is triggered, so that the switching state of a power switch in the load driving circuit is controlled to reduce the magnitude of the output current, and at the stage when the input voltage is lower than the first set voltage, the load driving control circuit controls the output current to output constant current through Io 2.
As shown in fig. 7, an embodiment of the present invention provides a load driving control circuit, which is applied to a load driving circuit. The load drive control circuit includes an input detection circuit and an output control circuit. The input detection circuit is used for acquiring a detection signal representing an input voltage. The output control circuit is coupled to the output end of the input detection circuit and is used for controlling the output power of the load driving circuit according to the detection signal. When the input voltage is higher than the first setting voltage, that is, the load drive control circuit is in a High-voltage input state, as shown in High Line of fig. 7, the output control circuit may keep the output voltage reference value and/or the output current reference value of the load drive circuit unchanged. When the input voltage is lower than the first setting voltage, that is, the load driving control circuit is in a Low-voltage input state, as shown in Low Line of fig. 7, the output control circuit changes the output voltage reference value of the load driving circuit from Vo1 to Vo2, and the output power of the load driving circuit is reduced by lowering the output voltage reference value. When the input voltage is lower than the first set voltage, the output voltage is reduced by reducing the reference value of the output voltage so as to reduce the ripple quantity of the output voltage, and the LED non-stroboscopic effect is realized. When the output voltage reference value is changed from Vo1 to Vo2, the output voltage of the current load driving circuit is still Vo1, at this time, overvoltage protection (abbreviated as OVP) is triggered, so that the switching state of a power switch in the load driving circuit is controlled to reduce the magnitude of the output voltage, and in a stage that the input voltage is lower than a first set voltage, the load driving control circuit controls the output voltage to perform constant voltage output through Vo 2.
As shown in fig. 8, an embodiment of the present invention provides a load driving control circuit, which is applied to a load driving circuit. The load drive control circuit includes an input detection circuit and an output control circuit. The input detection circuit is used for acquiring a detection signal representing an input voltage. The output control circuit is coupled to the output end of the input detection circuit and is used for controlling the output power of the load driving circuit according to the detection signal. When the input voltage is higher than the first setting voltage, that is, the load drive control circuit is in a High-voltage input state, as shown in High Line of fig. 8, the output control circuit may keep the output voltage reference value and/or the output current reference value of the load drive circuit unchanged. When the input voltage is lower than the first setting voltage, that is, the load drive control circuit is in a Low-voltage input state, as shown in Low Line of fig. 8, the output control circuit decreases the output voltage reference value and the output current reference value of the load drive circuit, thereby decreasing the output power of the load drive circuit. When the input voltage is lower than the first set voltage, the output voltage reference value and the output current reference value are reduced, so that the output voltage and the output current are reduced, the ripple quantity of the output voltage and the output current is reduced, and the LED non-stroboscopic effect is realized. The Low Line adjustment curve shown in fig. 8 is only intended as an example of reference value adjustment, and is not intended as a curve form for limiting reference value adjustment.
An embodiment of the utility model provides a load drive control circuit, in constant voltage drive circuit, output control circuit still is used for controlling load drive circuit's output voltage benchmark value when input voltage is less than the second and sets for voltage and maintains in the second benchmark interval. The second reference interval may be a predetermined reference value or a reference value range. The utility model discloses load drive control circuit of another embodiment, in the constant current drive circuit, output control circuit still is used for controlling load drive circuit's output current benchmark value to maintain in the second reference interval when input voltage is less than the second and sets for voltage. The utility model discloses load drive control circuit of another embodiment, in constant voltage constant current drive circuit, output control circuit still is used for controlling load drive circuit's output voltage benchmark value and output current benchmark value to maintain in the second benchmark interval when input voltage is less than the second settlement voltage. Wherein, the second setting voltage is smaller than the first setting voltage.
An embodiment of the utility model provides a load drive control circuit, when input voltage is between first settlement voltage and second settlement voltage, output control circuit control load drive circuit's output voltage reference value and/or output current reference value reduce along with input voltage's reduction.
An embodiment of the utility model provides a load drive control circuit, thereby input detection circuitry obtains the detected signal through detecting power switch's on-time among the load drive circuit. The on-time Ton can represent the magnitude of the input voltage Vin, and as can be seen from the formula Vin × Ton/Lm ═ Vcs/Rcs, the larger the on-time Ton, the lower the input voltage Vin. Wherein, Lm is an inductance of the load driving circuit, Vcs is a voltage value corresponding to the sampling current, and Rcs is a resistance value of the sampling resistor.
An embodiment of the utility model provides a load drive control circuit, the third input of first comparison circuit is coupled the second and is detected the reference signal end. The detection signal is the on-time of the power switch, the first detection reference signal is the first on-time, and the second detection reference signal is the second on-time. When the on-time is between the first on-time and the second on-time, the output control circuit controls the output voltage reference value and/or the output current reference value of the load driving circuit to be reduced along with the increase of the on-time; the first on-time is less than the second on-time.
As shown in fig. 9, an embodiment of the present invention provides a load driving control circuit, which can be applied to a Buck driving circuit or a flyback driving circuit of a peak current control type. When the on-time Ton of the power switch is between the first on-time Ton1 and the second on-time Ton2, the peak current reference value Vcs _ ref of the output control circuit controlling the load driving circuit decreases with the increase of the on-time Ton. Wherein the first on-time is less than the second on-time. The peak current reference value Vcs _ ref is positively correlated with the output current reference value, and in one embodiment Vcs _ ref is equal to the output current reference value multiplied by the sampling resistor Rcs. In the embodiment shown in fig. 9, when the on-time Ton is lower than the first on-time Ton1, the output control circuit is used to control the peak current reference value Vcs _ ref of the load driving circuit to be maintained at the first reference voltage V1. When the on-time Ton is higher than the second on-time Ton2, the output control circuit is used to control the peak current reference value Vcs _ ref of the load driving circuit to be maintained at the second reference voltage V2, wherein the first reference voltage V1 is greater than the second reference voltage V2.
As shown in fig. 10, an embodiment of the present invention provides a load driving control circuit, which includes a current source I1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first switch S1, a second switch S2, a third switch S3, a voltage-controlled current source V/I, and a comparison circuit. An output terminal of the current source I1 is coupled to the first terminal of the first switch S1, the first terminal of the first capacitor C1, and the first terminal of the second switch S2, respectively. The second terminal of the second switch S2 is coupled to the first terminal of the second capacitor C2 and the first terminal of the third switch S3, respectively. The second terminal of the third switch S3 is coupled to the first terminal of the third capacitor C3 and the input terminal of the voltage-controlled current source V/I, respectively. The switch control end of the second switch receives the PWM control signal of the power switch. The switch control terminal of the first switch receives an inverted signal of the PWM control signal of the power switch. The switch control end of the third switch receives the inverse signal of the PWM control signal of the power switch. The non-inverting input end of the comparison circuit is respectively coupled with the output end of the voltage control current source V/I and the peak current sampling end, and the peak current sampling end can obtain a signal representing the magnitude of current flowing through a load. The non-inverting input end and the peak current sampling end of the comparison circuit are also coupled with a first resistor R. The inverting input terminal of the comparison circuit is coupled to a preset reference voltage Vref. The second terminal of the first switch S1, the second terminal of the first capacitor C1, the second terminal of the second capacitor C2, and the second terminal of the third capacitor C3 are respectively coupled to ground. The output end of the comparison circuit is coupled with the switch control end of the power switch in the load driving circuit. When the voltage of the equidirectional input end of the comparison circuit is greater than the reference voltage Vref, overcurrent protection is triggered to turn off the power switch. In one embodiment, if the load driving circuit maintains a constant current output, Vcs + I × R is maintained at Vref. Vcs is a voltage value corresponding to the sampling current, and the preset reference voltage Vref can be kept unchanged.
Fig. 11 is a timing diagram corresponding to the control circuit shown in fig. 10 according to an embodiment of the present invention. When the PWM control signal of the power switch is active (i.e., high level), and the inverted signal of the PWM control signal of the power switch is inactive (i.e., low level), the current source I1 charges the first capacitor C1 and the second capacitor C2, the voltage VC1 at the first end of the first capacitor C1 gradually increases, and the voltage VC2 at the first end of the second capacitor C2 gradually increases. When the PWM control signal of the power switch is inactive (i.e., low level), the inverted signal of the PWM control signal of the power switch is active (i.e., high level), and the voltage VC1 at the first end of the first capacitor C1 becomes 0, the voltage VC1 at the first end of the second capacitor C2 may remain unchanged. When the input voltage decreases, the on-time Ton of the PWM control signal will increase. When the on-time Ton increases, the voltage VC3 at the first end of the third capacitor C3 will increase, and therefore the output current I of the voltage-controlled current source V/I will increase. At this time, Vcs + I × R will be greater than the preset reference voltage Vref, and overcurrent protection will be triggered to turn off the power switch. Therefore, when the on-time Ton is between the first on-time Ton1 and the second on-time Ton2, the decrease of the peak current reference value Vcs _ ref corresponding to the increase of the on-time Ton can be realized.
An embodiment of the utility model provides a load drive circuit, load drive circuit include as above load drive control circuit and power switch. The output end of the load driving control circuit is coupled with the control end of a power switch in the load driving circuit. The switch state of the power switch is controlled by the load drive control circuit, so that constant voltage output and/or constant current output are/is realized.
As shown in fig. 12, an embodiment of the present invention provides a load driving control method, which includes:
s100, acquiring a detection signal representing input voltage; and
step S200: controlling the output power of the load driving circuit according to the detection signal; when the input voltage is lower than the first set voltage, the output voltage reference value and/or the output current reference value of the load driving circuit are/is reduced, so that the output power of the load driving circuit is reduced.
In an embodiment of the present invention, the output power of the load driving circuit is controlled according to the detection signal. When the input voltage is higher than the first set voltage, the output voltage reference value is kept unchanged in the constant voltage driving circuit, the output current reference value is kept unchanged in the constant current driving circuit, and the output voltage reference value and the output current reference value are kept unchanged in the constant voltage and constant current driving circuit. In addition, when the input voltage is lower than the first set voltage, namely the load driving control circuit is in a low-voltage input state, the output control circuit reduces the output voltage reference value and/or the output current reference value of the load driving circuit, thereby reducing the output power of the load driving circuit.
The utility model discloses an in the embodiment, the step according to the output of detection signal control load drive circuit specifically is: and when the input voltage is lower than a second set voltage, controlling the output voltage reference value and/or the output current reference value of the load driving circuit to be maintained in a second reference interval, wherein the second set voltage is smaller than the first set voltage. When the input voltage is between the first setting voltage and the second setting voltage, the output voltage reference value and/or the output current reference value of the load driving circuit are controlled to be reduced along with the reduction of the input voltage.
In an embodiment of the present invention, the detection signal is an on-time, and the step of controlling the output power of the load driving circuit according to the detection signal specifically includes: and when the on-time is lower than the first on-time, controlling the output voltage reference value and/or the output current reference value of the load driving circuit to be maintained in a first reference interval. The first reference interval may be a predetermined reference value or a reference value range. And when the on time is higher than the second on time, controlling the output voltage reference value and/or the output current reference value of the load driving circuit to be maintained in a second reference interval. When the on-time is between the first on-time and the second on-time, the output voltage reference value and/or the output current reference value of the load driving circuit are controlled to be reduced along with the increase of the on-time. Wherein the first on-time is less than the second on-time.
The utility model provides a load drive circuit, load drive control circuit and control method can ensure that output signal's reference signal follows input voltage's change and corresponding change and effectively restrain the ripple to load drive circuit's influence to realize that LED does not have the stroboscopic.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The description and applications of the present invention are illustrative and are not intended to limit the scope of the invention to the embodiments described above. Effects or advantages referred to in the embodiments may not be reflected in the embodiments due to interference of various factors, and the description of the effects or advantages is not intended to limit the embodiments. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the present invention.
Claims (9)
1. A load driving control circuit applied to a load driving circuit, the load driving control circuit comprising:
the input detection circuit is used for acquiring a detection signal representing input voltage; and
the input end of the output control circuit is coupled with the output end of the input detection circuit, and the output end of the output control circuit is coupled with a power switch in the load driving circuit and used for controlling the output power of the load driving circuit according to the detection signal; the output control circuit comprises a first comparison circuit and an output reference regulating circuit, wherein a first input end of the first comparison circuit is coupled with an output end of the input detection circuit, and a second input end of the first comparison circuit is coupled with a first detection reference signal end; the input end of the output reference regulating circuit is coupled with the output end of the first comparing circuit, and the output reference regulating circuit regulates the output voltage reference value and/or the output current reference value of the load driving circuit according to the comparison result of the first comparing circuit.
2. The load driving control circuit according to claim 1, wherein the third input terminal of the first comparing circuit is coupled to a second detection reference signal terminal; when the input voltage is lower than a first set voltage, the output control circuit reduces an output voltage reference value and/or an output current reference value of the load driving circuit, so that the output power of the load driving circuit is reduced; when the input voltage is lower than a second set voltage, the output control circuit controls the output voltage reference value and/or the output current reference value of the load driving circuit to be maintained in a second reference interval, and the second set voltage is smaller than the first set voltage.
3. The load driving control circuit according to claim 2, wherein the output control circuit controls the output voltage reference value and/or the output current reference value of the load driving circuit to decrease with a decrease in the input voltage when the input voltage is between the first setting voltage and the second setting voltage.
4. The load driving control circuit according to claim 1, wherein the input detection circuit obtains the detection signal by detecting a turn-on time of a power switch in the load driving circuit.
5. The load driving control circuit according to claim 1, wherein the third input terminal of the first comparing circuit is coupled to a second detection reference signal terminal; the detection signal is the conduction time of the power switch, the first detection reference signal is the first conduction time, and the second detection reference signal is the second conduction time; when the on-time is between a first on-time and a second on-time, the output control circuit controls the output voltage reference value and/or the output current reference value of the load driving circuit to be reduced along with the increase of the on-time; the first on-time is less than the second on-time.
6. The load driving control circuit according to claim 5, wherein the output control circuit is configured to control the output voltage reference value and/or the output current reference value of the load driving circuit to be maintained within a first reference interval when the on-time is lower than the first on-time.
7. The load driving control circuit according to claim 5, wherein the output control circuit is configured to control the output voltage reference value and/or the output current reference value of the load driving circuit to be maintained within a second reference interval when the on-time is higher than a second on-time.
8. The load drive control circuit of claim 1,
the load driving control circuit comprises a current source, a first capacitor, a second capacitor, a third capacitor, a first switch, a second switch, a third switch, a voltage control current source and a comparison circuit;
the output end of the current source is respectively coupled with the first end of the first switch, the first end of the first capacitor and the first end of the second switch; the second end of the second switch is coupled to the first end of the second capacitor and the first end of the third switch respectively; the second end of the third switch is respectively coupled with the first end of the third capacitor and the input end of the voltage control current source; the non-inverting input end of the comparison circuit is respectively coupled with the output end of the voltage control current source and the peak current sampling end; a first resistor is also coupled between the non-inverting input end and the peak current sampling end of the comparison circuit; the inverting input end of the comparison circuit is coupled with a preset reference voltage;
the second end of the first switch, the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor are respectively coupled to the ground.
9. A load driving circuit, characterized in that the load driving circuit comprises the load driving control circuit according to any one of claims 1 to 8 and a power switch; the output end of the load driving control circuit is coupled with the power switch.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114911297A (en) * | 2022-05-23 | 2022-08-16 | 峰岹科技(深圳)股份有限公司 | Drive control circuit for LDO circuit, LDO circuit and chip thereof |
-
2020
- 2020-05-20 CN CN202020850250.5U patent/CN211792163U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114911297A (en) * | 2022-05-23 | 2022-08-16 | 峰岹科技(深圳)股份有限公司 | Drive control circuit for LDO circuit, LDO circuit and chip thereof |
| CN114911297B (en) * | 2022-05-23 | 2023-08-08 | 峰岹科技(深圳)股份有限公司 | Drive control circuit for LDO circuit, LDO circuit and chip thereof |
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