CN217216370U - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
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- CN217216370U CN217216370U CN202220141526.1U CN202220141526U CN217216370U CN 217216370 U CN217216370 U CN 217216370U CN 202220141526 U CN202220141526 U CN 202220141526U CN 217216370 U CN217216370 U CN 217216370U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a power supply circuit, include: the power supply comprises a voltage source module, a control module and a power loop module; a first power supply end of the voltage source module is connected with a first energy storage end of the power loop module, and a second power supply end of the voltage source module is connected with a second energy storage end of the power loop module; the sampling end of the power loop module is connected with the sampling input end of the control module, and the control output end of the control module is connected with the control end of the power loop module; the voltage source module is used for supplying power to the power loop module; the power loop module is used for supplying power to a load; and the control module is used for outputting a control signal to the power loop module through a control output end based on the signal acquired by the sampling input end so as to realize the control of the power loop module. The power supply circuit can supply power to the power loop module and the load, and the control module controls the power loop module.
Description
Technical Field
The utility model relates to a power supply circuit technical field especially relates to a power supply circuit.
Background
A DC chopper circuit is a power electronic converter that converts a DC power with a constant voltage into a DC power with an adjustable voltage, and is also called a DC chopper or a DC/DC converter.
A Boost Chopper circuit (Boost Chopper), referred to as Boost circuit for short, is one of six basic Chopper circuits, and is a switching direct current Boost circuit, which can make the output voltage higher than the input voltage. The existing Boost circuit requires that the input voltage is lower than 75% of the backlight voltage, otherwise, when the Boost circuit does not work, the problem that the backlight is slightly bright is easily caused; meanwhile, the load of the output end of the existing BOOST circuit cannot be too large, otherwise the standby power consumption of the input end can be influenced.
The Buck conversion circuit, abbreviated as Buck circuit, can make the output voltage lower than the input voltage. Loads in the conventional Buck circuit such as backlight LED lamp strings are easy to cause great current impact to ground short circuit, so that the backlight LED lamp strings can be damaged; meanwhile, the Buck circuit has the maximum duty ratio limitation, so that the input voltage is required to be more than 30V larger than the voltage of the backlight LED lamp string; in addition, the conventional Buck circuit also has the problem of complex control.
In order to solve the above problems, the existing technical scheme adopts an evolution scheme of a Buck circuit, a ground terminal is placed at an MOS terminal of a conventional Buck, and positions of an original inductor and a load are moved at the same time, so that the problem is solved, and IC control is facilitated.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pair of power supply circuit has solved the above-mentioned technical problem effectively, has realized the output voltage of broad scope.
An embodiment of the utility model provides a power supply circuit, include: the power supply comprises a voltage source module, a control module and a power loop module;
a first power supply end of the voltage source module is connected with a first energy storage end of the power loop module, and a second power supply end of the voltage source module is connected with a second energy storage end of the power loop module; the sampling end of the power loop module is connected with the sampling input end of the control module, and the control output end of the control module is connected with the control end of the power loop module;
the voltage source module is used for supplying power to the power loop module;
the power loop module is used for supplying power to a load;
and the control module is used for outputting a control signal to the power loop module through the control output end based on the signal acquired by the sampling input end so as to realize the control of the power loop module.
Optionally, the power loop module is a constant current control module.
Optionally, the power loop module includes: the device comprises a first energy storage inductor, a first rectifier diode, a first filter capacitor, a second filter capacitor, a first switch tube and a first sampling unit;
the first end of the first filter capacitor is respectively connected with the first power supply end, one end of the first energy storage inductor and the first end of the first rectifying diode, the second end of the first filter capacitor is respectively connected with the second power supply end and the first end of the first switch tube, the second end of the first switch tube is respectively connected with the other end of the first energy storage inductor, the first end of the second filter capacitor, one end of the first sampling unit and the ground, the third end of the first switch tube is used as the control end of the power loop module, the second end of the first rectifying diode is respectively connected with the second end of the second filter capacitor and the first end of the load, the other end of the first sampling unit is respectively connected with the second end of the load and the sampling input end of the control module.
Optionally, the first sampling unit includes a resistor.
Optionally, the control module is connected to the first switch tube in common.
Optionally, the power loop module is a constant voltage control module.
Optionally, the power loop module includes: the second energy storage inductor, the second rectifier diode, the third filter capacitor, the fourth filter capacitor, the second switch tube and the second sampling unit;
the first end of the third filter capacitor is connected with the first power end, one end of the second energy storage inductor and the first end of the second rectifier diode, the second end of the third filter capacitor is connected with the second power end and the first end of the second switch tube, the second end of the second switch tube is connected with the other end of the second energy storage inductor, the first end of the fourth filter capacitor, the first end of the second sampling unit, the second end of the load and the ground, the third end of the second switch tube is used as the control end of the power loop module and is connected with the control output end of the control module, the second end of the second rectifier diode is connected with the second end of the fourth filter capacitor, the first end of the load and the second end of the second sampling unit, and the third end of the second sampling unit is used as the sampling end of the power loop module and is connected with the sampling input end of the control module And (6) connecting.
Optionally, the second sampling unit includes a first sampling resistor and a second sampling resistor, one end of the first sampling resistor is used as the first end of the second sampling unit, the other end of the first sampling resistor is connected with one end of the second sampling resistor and then used as the sampling end of the power loop module, and the other end of the second sampling resistor is used as the second end of the second sampling unit.
Optionally, the control module is connected to the second switching tube in common.
Optionally, the voltage source module is composed of a winding of a transformer, and the voltage source module is not commonly grounded with the control module.
The embodiment of the utility model provides a power supply circuit, include: the power supply comprises a voltage source module, a control module and a power loop module; a first power supply end of the voltage source module is connected with a first energy storage end of the power loop module, and a second power supply end of the voltage source module is connected with a second energy storage end of the power loop module; the sampling end of the power loop module is connected with the sampling input end of the control module, and the control output end of the control module is connected with the control end of the power loop module; the voltage source module is used for supplying power to the power loop module; the power loop module is used for supplying power to a load; and the control module is used for outputting a control signal to the power loop module through the control output end based on the signal acquired by the sampling input end so as to realize the control of the power loop module. By utilizing the technical scheme, the voltage source module supplies power to the power loop module, the power loop module supplies power to the load, and the control module controls the power loop module based on the signal acquired by the sampling input end by connecting the voltage source module, the control module and the power loop module, so that the output voltage in a wider range is realized.
Drawings
Fig. 1 is a schematic structural diagram of a power circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a power circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a power circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a power circuit in an on mode according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a power circuit in an off mode according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Furthermore, the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. In the following embodiments, optional features and examples are provided in each embodiment, and the individual features described in the embodiments may be combined to form a plurality of alternatives.
In the description of the present invention, when an element is referred to as being "disposed on" another element, it may be directly disposed on the another element or be indirectly disposed on the another element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected to the other element. E.g. a fixed connection, a detachable connection, a mechanical or electrical connection, etc.
Fig. 1 is a schematic structural diagram of a power supply circuit provided in an embodiment of the present invention, where the present embodiment is applicable to a situation of providing a power supply for a load.
As shown in fig. 1, an embodiment of the present invention provides a power circuit, including: the power supply comprises a voltage source module 1, a control module 2 and a power loop module 3;
a first power supply end of the voltage source module 1 is connected with a first energy storage end of the power loop module 3, and a second power supply end of the voltage source module 1 is connected with a second energy storage end of the power loop module 3; the sampling end of the power loop module 3 is connected with the sampling input end of the control module 2, and the control output end of the control module 2 is connected with the control end of the power loop module 3;
the voltage source module 1 is used for supplying power to the power loop module 3;
the power loop module 3 is used for supplying power to a load;
and the control module 2 is configured to output a control signal to the power loop module 3 through the control output terminal based on the signal acquired by the sampling input terminal, so as to control the power loop module 3.
The voltage source module 1 may be considered as a module for providing voltage in the power circuit, and is configured to supply power to the power loop module 3 in the power circuit; the voltage source module 1 is not limited in composition, and the voltage source module 1 may include an electromotive force, an internal resistance, or may be composed of a winding of a transformer. It is assumed that the voltage source module 1 can provide is constant.
The voltage source module 1 may have two ports, which are an anode and a cathode of the voltage source module 1, in this embodiment, the first power end may refer to one port of the voltage source module 1, the second power end may refer to another port of the voltage source module 1, and the first power end and the second power end are only used for distinguishing different ports, which is not limited in this embodiment, for example, the first power end may be the cathode of the voltage source module 1, and the second power end may be the anode of the voltage source module 1.
The control module 2 can be understood as a module that controls the power loop module 3 in the power circuit; the control module 2 may be understood as an integrated circuit, and the devices included in the control module 2 are not limited and may include, for example, a processor, a controller, and the like; the control module 2 may have two ports, which are a sampling input end and a control output end, respectively, where the sampling input end is used for inputting a signal acquired by the sampling end of the power loop module 3, the control output end is used for outputting a control signal, and the control signal may be an instruction for controlling the power loop module 3.
Specifically, the control module 2 may analyze the signal collected by the sampling input terminal and output a corresponding control signal to the power loop module 3 through the control output terminal, so as to control the power loop module 3.
The power circuit module 3 may be understood as a closed circuit module composed of multiple devices, where the multiple devices may be, for example, an energy storage inductor, a rectifier diode, a filter capacitor, a switching tube, and/or a sampling unit; the power loop module 3 may be configured to supply power to a load other than the power circuit, for example, the load may be an LED string, a TV, or the like; the power loop module 3 may have four ports, which are a first energy storage end, a second energy storage end, a sampling end, and a control end.
In this embodiment, the first energy storage end and the second energy storage end may be considered as ports for storing energy in the power circuit module 3, the first energy storage end may be connected to a first power end of the voltage source module 1, the second energy storage end may be connected to a second power end of the voltage source module 1 to supply power to the power circuit module 3, the first energy storage end and the second energy storage end are only used for distinguishing different ports, and the embodiment does not limit the first energy storage end and the second energy storage end; the sampling end can be regarded as a port for sampling signals by the power loop module 3, the acquired signals can be, for example, the voltage of a sampling resistor, the current of a branch where the sampling resistor is located, and the like, and after sampling at the sampling end is completed, the sampling end can be connected with the circuit of the sampling input end of the control module 2, and the acquired signals are transmitted to the sampling input end of the control module 2; the control end may refer to a port in the power loop module 3 that receives the control signal of the control module 2, and the control end of the power loop module 3 may be connected to the control output end of the control module 2, and is configured to receive the control signal of the control module 2 to implement a response of the power loop module 3 to the control signal.
Specifically, the control module 2 may perform different controls on the working state of the power loop module 3 according to the collected signal, which is not limited in this embodiment, for example, the control module 2 may monitor the current of the load according to the collected signal, and control the current of the load to approach a constant value, that is, it is ensured that the power loop module 3 is a constant current control module; the control module 2 can also monitor the voltage of the load according to the acquired signal and control the voltage of the load to tend to a constant value, i.e. the power loop module 3 is ensured to be a constant voltage control module.
In one embodiment, the power loop module is a constant current control module.
For example, when a signal acquired by a sampling end of the power loop module is a voltage value of a sampling resistor, the control module may calculate the voltage value as a current of a current load, compare the current of the current load with a preset current threshold, and control the on/off of a switching tube in the power loop module according to a comparison result, so as to implement constant current control of the power loop module. The preset current threshold may be set by a relevant person, which is not limited in this embodiment.
The input and the output of the power circuit can be separated by switching on or off the switch tube, so that the short circuit influence caused by the load of the output end does not need to be considered, and the problem of slight brightness when the input voltage is close to the backlight voltage is solved.
In one embodiment, the power loop module includes: the device comprises a first energy storage inductor, a first rectifier diode, a first filter capacitor, a second filter capacitor, a first switch tube and a first sampling unit;
a first end of the first filter capacitor is connected to the first power source terminal, one end of the first energy storage inductor, and a first end of the first rectifying diode, the second end of the first filter capacitor is respectively connected with the second power supply end and the first end of the first switch tube, the second end of the first switch tube is respectively connected with the other end of the first energy storage inductor, the first end of the second filter capacitor, one end of the first sampling unit and the ground, the third end of the first switch tube is used as the control end of the power loop module, the second end of the first rectifying diode is respectively connected with the second end of the second filter capacitor and the first end of the load, the other end of the first sampling unit is respectively connected with the second end of the load and the sampling input end of the control module.
The first energy storage inductor may have two ports, which are one end of the first energy storage inductor and the other end of the first energy storage inductor, respectively, where the port of the first energy storage inductor at one end of the first energy storage inductor and the port of the first energy storage inductor at the other end of the first energy storage inductor are not limited, and may be any port of the first energy storage inductor.
The first rectifying diode may be configured to convert ac power in the circuit into dc power, and the first rectifying diode may have two ports, i.e., a first terminal of the first rectifying diode and a second terminal of the first rectifying diode, where the specific ports of the first terminal of the first rectifying diode and the second terminal of the first rectifying diode are not limited, and may be any port of the first rectifying diode, for example, the first terminal of the first rectifying diode may be regarded as an anode of the first rectifying diode, and the second terminal of the first rectifying diode may be regarded as a cathode of the first rectifying diode.
The first filter capacitor and the second filter capacitor may refer to an energy storage device for reducing an ac ripple coefficient and improving a high-efficiency smooth dc output, the first filter capacitor may be responsible for filtering of a front-end circuit, the second filter capacitor may be responsible for filtering of a back-end circuit, the first filter capacitor and the second filter capacitor are only used for distinguishing different objects, and the first filter capacitor and the second filter capacitor are not limited in this embodiment;
the first filter capacitor may have two ports, which are a first end of the first filter capacitor and a second end of the first filter capacitor, and the second filter capacitor may have two ports, which are a first end of the second filter capacitor and a second end of the second filter capacitor, respectively.
The first switch tube may be configured to switch on and off the control circuit, the first switch tube may have three ports, which are a first end of the first switch tube, a second end of the first switch tube, and a third end of the first switch tube, where specific ports of the first end of the first switch tube and the second end of the first switch tube are not limited, and may be any port of the first switch tube, and the third end of the first switch tube may be a control end of the power loop module and is connected to a control output end of the control module.
The first sampling unit may refer to a unit for acquiring parameters in the circuit, such as a unit for acquiring voltage, and optionally, the first sampling unit may include a sampling resistor to implement current sampling and/or voltage sampling, the sampling resistor may be considered as a current limiting element, and in this embodiment, the sampling resistor may be connected in series in the circuit to convert current into a voltage signal for measurement. The first sampling unit may have two ports, which are one end of the first sampling unit and the other end of the first sampling unit, respectively, where the specific ports of the one end of the first sampling unit and the other end of the first sampling unit are not limited, and may be any port of the first sampling unit.
The load may have two ports, namely a first end of the load and a second end of the load, wherein the specific ports of the first end of the load and the second end of the load are not limited, and may be any port of the load, for example, the first end of the load may be considered as a positive pole of the load, and the second end of the load may be considered as a negative pole of the load.
Fig. 2 is a circuit diagram of a power supply circuit provided by an embodiment of the present invention, as shown in fig. 2, the voltage source module includes a voltage source, and the power loop module includes a first energy storage inductor L1, a first rectifier diode D1, a first filter capacitor E1, a second filter capacitor E2, a first switch tube Q1 and a first sampling unit R1.
In this embodiment, a first end of the first filter capacitor E1 is connected to the first power source terminal, one end of the first energy-storage inductor L1 and a first end (i.e., end a) of the first rectifying diode D1, a second end of the first filter capacitor E1 is connected to the second power source terminal and the first end (i.e., end D) of the first switch tube Q1, a second end (i.e., end S) of the first switch tube Q1 is connected to the other end of the first energy-storage inductor L1, the first end of the second filter capacitor E2, one end of the first sampling unit R1 and ground, a second end (i.e., end K) of the first rectifying diode D1 is connected to the second end of the second filter capacitor E2 and the first end of the load (i.e., LED string), and the other end of the first sampling unit R1 is connected to the second end of the load and the sampling input end of the control module.
In one embodiment, the first sampling unit comprises a resistor.
In this embodiment, the first sampling unit may include a resistor, i.e., a sampling resistor, to implement current sampling and/or voltage sampling.
In one embodiment, the control module is common to the first switching tube.
In this embodiment, the control module and the first switch tube may be connected to the same ground, so as to implement a function of conveniently controlling the first switch tube. In addition, in this embodiment, the load may also be close to the ground end, so as to facilitate the sampling by the first sampling unit.
In one embodiment, the power loop module is a constant voltage control module.
For example, when a signal acquired by a sampling end of the power loop module is a voltage value of a sampling resistor, the control module may compare the voltage value with a preset voltage threshold, and control the on/off of a switching tube in the power loop module according to a comparison result, so as to implement the constant voltage control of the power loop module. The preset voltage threshold may be set by a relevant person, which is not limited in this embodiment.
In one embodiment, the power loop module comprises: the second energy storage inductor, the second rectifier diode, the third filter capacitor, the fourth filter capacitor, the second switch tube and the second sampling unit;
the first end of the third filter capacitor is connected with the first power end, one end of the second energy storage inductor and the first end of the second rectifier diode, the second end of the third filter capacitor is connected with the second power end and the first end of the second switch tube, the second end of the second switch tube is connected with the other end of the second energy storage inductor, the first end of the fourth filter capacitor, the first end of the second sampling unit, the second end of the load and the ground, the third end of the second switch tube is used as the control end of the power loop module and is connected with the control output end of the control module, the second end of the second rectifier diode is connected with the second end of the fourth filter capacitor, the first end of the load and the second end of the second sampling unit, and the third end of the second sampling unit is used as the sampling end of the power loop module and is connected with the sampling input end of the control module And (6) connecting.
The second energy storage inductor and the first energy storage inductor have similar functions and can be used for storing energy, the second energy storage inductor and the first energy storage inductor are only used for distinguishing different objects, and the second energy storage inductor and the first energy storage inductor are not limited in the embodiment. The second energy storage inductor may have two ports, which are respectively one end of the second energy storage inductor and the other end of the second energy storage inductor, wherein the port of the second energy storage inductor is not limited to which one end of the second energy storage inductor and the other end of the second energy storage inductor are, and may be any one port of the second energy storage inductor,
the second rectifying diode has a function similar to that of the first rectifying diode, and can be used for converting alternating current electric energy in a circuit into direct current electric energy, the second rectifying diode and the first rectifying diode are only used for distinguishing different objects, and the second rectifying diode and the first rectifying diode are not limited in this embodiment. The second rectifying diode may have two ports, namely, a first end of the second rectifying diode and a second end of the second rectifying diode, where the specific ports of the first end of the second rectifying diode and the second end of the second rectifying diode are not limited, and may be any port of the second rectifying diode, for example, the first end of the second rectifying diode may be considered as an anode of the second rectifying diode, and the second end of the second rectifying diode may be considered as a cathode of the second rectifying diode.
The third filter capacitor and the fourth filter capacitor have similar functions to the first filter capacitor and the second filter capacitor, and may refer to an energy storage device for reducing ac ripple coefficients and improving high-efficiency smooth dc output, the third filter capacitor may be responsible for filtering of a front-end circuit, the fourth filter capacitor may be responsible for filtering of a back-end circuit, the third filter capacitor and the fourth filter capacitor are only used for distinguishing different objects, and the third filter capacitor, the fourth filter capacitor, the first filter capacitor and the second filter capacitor are not limited in this embodiment; the third filter capacitor may have two ports, which are a first end of the third filter capacitor and a second end of the third filter capacitor, respectively, and the fourth filter capacitor may have two ports, which are a first end of the fourth filter capacitor and a second end of the fourth filter capacitor, respectively.
The second switch tube may be used to control the switching-off and switching-on of the circuit, and the second switch tube and the first switch tube are only used to distinguish different objects, and the second switch tube and the first switch tube are not limited in this embodiment. The second switch tube may have three ports, which are a first end of the second switch tube, a second end of the second switch tube, and a third end of the second switch tube, where specific ports of the first end of the second switch tube and the second end of the second switch tube are not limited, and may be any port of the second switch tube, and the third end of the second switch tube is used as a control end of the power loop module and is connected to a control output end of the control module, for example, the second switch tube may be an MOS tube, and then the first end of the second switch tube and the second end of the second switch tube may be any one of a source electrode and a drain electrode of the MOS tube, and the third end of the second switch tube may be a gate electrode of the MOS tube.
The second sampling unit may refer to a unit for acquiring parameters in the circuit, for example, a unit for acquiring voltage, and optionally, the second sampling unit may include a sampling resistor to implement current sampling and/or voltage sampling, where the number of the sampling resistors is not limited, and may be one or more. The second sampling unit may have three ports, which are a first end of the second sampling unit, a second end of the second sampling unit, and a third end of the second sampling unit, where the first end of the second sampling unit, the second end of the second sampling unit, and the third end of the second sampling unit are only used to distinguish different objects, specific ports of the first end of the second sampling unit and the second end of the second sampling unit are not limited, and may be any port of the first sampling unit, and the third end of the second sampling unit may be connected to a sampling input end of the control module as a sampling end of the power loop module.
The load may have two ports, namely a first end of the load and a second end of the load, wherein the specific ports of the first end of the load and the second end of the load are not limited, and may be any port of the load, for example, the first end of the load may be considered as a positive pole of the load, and the second end of the load may be considered as a negative pole of the load.
Fig. 3 is a circuit diagram of a power supply circuit provided by the embodiment of the present invention, as shown in fig. 3, the voltage source module includes a voltage source, and the power loop module includes a second energy storage inductor L2, a second rectifier diode D2, a third filter capacitor E3, a fourth filter capacitor E4, a second switch tube Q2, and a second sampling unit including a sampling resistor R2 and a sampling resistor R3.
In this embodiment, a first end of the third filter capacitor E3 is connected to the first power source terminal, one end of the second energy-storage inductor L2 and a first end (i.e., end a) of the second rectifier diode D2, a second end of the third filter capacitor E3 is connected to the second power source terminal and the first end (i.e., end D) of the second switch tube Q2, a second end (i.e., end S) of the second switch tube Q2 is connected to the other end of the second energy-storage inductor L2, the first end of the fourth filter capacitor E4, the first end of the second sampling unit, the second end of the load (i.e., LED string) and ground, a second end (i.e., end a) of the second rectifier diode D2 is connected to the second end of the fourth filter capacitor E4, the first end of the load and the second end of the second sampling unit, and the third end of the second sampling unit is connected to the sampling input terminal of the control module as a sampling terminal of the power loop module.
In one embodiment, the second sampling unit includes a first sampling resistor and a second sampling resistor, one end of the first sampling resistor is used as the first end of the second sampling unit, the other end of the first sampling resistor is connected with one end of the second sampling resistor and then used as the sampling end of the power loop module, and the other end of the second sampling resistor is used as the second end of the second sampling unit.
The first sampling resistor and the second sampling resistor are only used for distinguishing different objects, the first sampling resistor and the second sampling resistor are not limited in this embodiment, and for example, the first sampling resistor may be the same as or different from the second sampling resistor.
Taking fig. 3 as an example, the first sampling resistor may be R1, the second sampling resistor may be R2, one end of the first sampling resistor may be used as the first end of the second sampling unit, the other end of the first sampling resistor may be connected to one end of the second sampling resistor and then used as the sampling end of the power loop module, and the other end of the second sampling resistor may be used as the second end of the second sampling unit.
In one embodiment, the control module is common to the second switching tube.
As shown in fig. 3, the control IC (i.e., the control module) may be commonly connected to the second switch Q1 to facilitate control of the second switch Q1. In addition, in this embodiment, the load may also be close to the ground (i.e., GND) to facilitate the sampling by the second sampling unit.
In one embodiment, the voltage source module is comprised of windings of a transformer, the voltage source module is not co-grounded with the control module.
In this embodiment, the voltage source module may be composed of a winding of a transformer, the winding of the transformer may be formed by winding a copper wire or an aluminum wire with high conductivity, and meanwhile, the voltage source module and the control module are not grounded together.
It can be understood that, the same as the existing power circuit, the power circuit provided by the embodiment of the present invention can have two working states in each switching period while maintaining the continuous conduction mode, that is, when the switching tube is conducted, the switching tube is in the on state; when the switch tube is cut off, the switch tube is in an off state.
Fig. 4 is a circuit diagram of the power circuit in the on-state mode provided by the embodiment of the present invention, as shown in fig. 4, in the on-state mode, the input voltage (e.g. the voltage source module) is directly loaded on the energy storage inductor, e.g. both ends of the first energy storage inductor, and since the loaded voltage is a fixed value, the current of the energy storage inductor increases linearly, and all the output load currents are provided by the filter capacitor (e.g. the second filter capacitor or the fourth filter capacitor).
Fig. 5 is a circuit diagram of power supply circuit under the off-state mode provided by the embodiment of the present invention, as shown in fig. 5, under the off-state operation, because the switch tube is disconnected, the energy storage inductive current is reduced, the polarity of the voltage at both ends of the energy storage inductor is reversed, and the current of the energy storage inductor simultaneously provides current for the output capacitor (such as the second filter capacitor or the fourth filter capacitor) and the output load (such as the LED light string), and the output voltage is opposite to the input voltage according to the current flowing direction.
Therefore, in this embodiment, the switch tube (e.g., the first switch tube or the second switch tube) can be regarded as a main control switch of the power circuit, when the control IC (i.e., the control module) drives the switch tube with a voltage, the switch tube is turned on, and the input voltage source stores energy for the energy storage inductor (e.g., the first energy storage inductor or the second energy storage inductor). Meanwhile, the voltage on the energy storage inductor is rectified and filtered by a rectifier diode (such as a first rectifier diode or a second rectifier diode D1) and a filter capacitor (such as a second filter capacitor or a fourth filter capacitor E2) and then passes through a load (an LED lamp string). When the switch tube is cut off, the energy storage inductor (such as the first energy storage inductor or the second energy storage inductor) reverses the electromotive force, and the electromotive force is rectified and filtered by the D1 and the E2 to provide energy for the load (the LED lamp string).
In addition, according to the volt-second characteristic of the inductor, under the stable working state of the power supply circuit, the product of the voltage at two ends of the energy storage inductor and the turn-on time is equal to the product of the voltage at two ends of the energy storage inductor and the turn-off time at the turn-off time. I.e. the energy storage inductor in a steady state, the volt-seconds of the on-time (current rise) of the switch must be equal in value to the volt-seconds of the off-time (current fall) of the switch, although the signs of the two are opposite. This also means that the energy storage inductor voltage is plotted against time, and the area of the on-period curve must be equal to the area of the off-period curve.
For example, in an on state, an input voltage is applied to the energy storage inductor, the voltage may be denoted as Vin, and the time may be denoted as ton; in the off state, the energy storage inductor releases energy, the voltage can be denoted as Vo, the time can be denoted as toff, wherein ton + toff can be one complete cycle, denoted as tall, and ton/tall is D, i.e. the duty cycle. According to the volt-second principle, Vin is ton, Vo is toff.
Therefore, in the conventional power supply circuit, Vo/Vin is D/(1-D). When D is less than 0.5, the power supply circuit is a voltage reduction circuit, and at the moment, Vo is less than Vin; when D is greater than 0.5, the power circuit is a boost circuit, and at this time, Vo > Vin.
Therefore, the utility model discloses in, control module can adjust the duty cycle according to the signal that the sampling input was gathered to switching on or ending of control switch pipe. Specifically, when the sampled signal is smaller than the preset voltage threshold, the duty ratio can be increased, that is, the switching tube is controlled to be conducted; when the sampled signal is larger than the preset voltage threshold, the duty ratio can be reduced, namely the switching tube is controlled to be cut off. It can be seen that the embodiment of the utility model provides a power supply circuit is Buck-Boost circuit, just the utility model discloses a power supply circuit has Vo/Vin ═ D under the continuous conduction mode, and in current power supply circuit, Vo/Vin ═ D/(1-D) compares, the utility model discloses a power supply circuit can adapt ground output range wide enough, and output voltage range is great promptly.
As can be seen from the above description, the power circuit provided by the embodiment of the present invention can adopt the control module of the conventional general Boost to control the circuit; meanwhile, the input and the output can be separated by the switch tube, so that the short circuit influence caused by the load of the output end does not need to be considered, the problem of slight brightness when the input voltage is close to the backlight voltage is solved, and in addition, the power supply circuit has the advantages of simple realization structure and few devices.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A power supply circuit, comprising: the power supply comprises a voltage source module, a control module and a power loop module;
a first power supply end of the voltage source module is connected with a first energy storage end of the power loop module, and a second power supply end of the voltage source module is connected with a second energy storage end of the power loop module; the sampling end of the power loop module is connected with the sampling input end of the control module, and the control output end of the control module is connected with the control end of the power loop module;
the voltage source module is used for supplying power to the power loop module;
the power loop module is used for supplying power to a load;
and the control module is used for outputting a control signal to the power loop module through the control output end based on the signal acquired by the sampling input end so as to control the power loop module.
2. The power supply circuit of claim 1, wherein the power loop module is a constant current control module.
3. The power circuit of claim 2, wherein the power loop module comprises: the device comprises a first energy storage inductor, a first rectifier diode, a first filter capacitor, a second filter capacitor, a first switch tube and a first sampling unit;
a first end of the first filter capacitor is connected to the first power source terminal, one end of the first energy storage inductor, and a first end of the first rectifying diode, the second end of the first filter capacitor is respectively connected with the second power supply end and the first end of the first switch tube, the second end of the first switch tube is respectively connected with the other end of the first energy storage inductor, the first end of the second filter capacitor, one end of the first sampling unit and the ground, the third end of the first switch tube is used as the control end of the power loop module, the second end of the first rectifying diode is respectively connected with the second end of the second filter capacitor and the first end of the load, the other end of the first sampling unit is respectively connected with the second end of the load and the sampling input end of the control module.
4. The power supply circuit of claim 3, wherein the first sampling unit comprises a resistor.
5. The power circuit of claim 3, wherein the control module is common to the first switch tube.
6. The power circuit of claim 1, wherein the power loop module is a constant voltage control module.
7. The power supply circuit of claim 6, wherein the power loop module comprises: the second energy storage inductor, the second rectifier diode, the third filter capacitor, the fourth filter capacitor, the second switch tube and the second sampling unit;
the first end of the third filter capacitor is connected with the first power end, one end of the second energy storage inductor and the first end of the second rectifier diode, the second end of the third filter capacitor is connected with the second power end and the first end of the second switch tube, the second end of the second switch tube is connected with the other end of the second energy storage inductor, the first end of the fourth filter capacitor, the first end of the second sampling unit, the second end of the load and the ground, the third end of the second switch tube is used as the control end of the power loop module and is connected with the control output end of the control module, the second end of the second rectifier diode is connected with the second end of the fourth filter capacitor, the first end of the load and the second end of the second sampling unit, and the third end of the second sampling unit is used as the sampling end of the power loop module and is connected with the sampling input end of the control module And (6) connecting.
8. The power supply circuit according to claim 7, wherein the second sampling unit includes a first sampling resistor and a second sampling resistor, one end of the first sampling resistor is used as the first end of the second sampling unit, the other end of the first sampling resistor is connected with one end of the second sampling resistor and then used as the sampling end of the power loop module, and the other end of the second sampling resistor is used as the second end of the second sampling unit.
9. The power circuit of claim 7, wherein the control module is common to the second switching tube.
10. The power supply circuit according to any one of claims 1-9, wherein the voltage source module is comprised of a winding of a transformer, the voltage source module being non-common to the control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220141526.1U CN217216370U (en) | 2022-01-19 | 2022-01-19 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220141526.1U CN217216370U (en) | 2022-01-19 | 2022-01-19 | Power supply circuit |
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| CN217216370U true CN217216370U (en) | 2022-08-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220141526.1U Active CN217216370U (en) | 2022-01-19 | 2022-01-19 | Power supply circuit |
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| CN (1) | CN217216370U (en) |
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