CN109327131B - Current-limiting switch circuit and switching power supply device - Google Patents
Current-limiting switch circuit and switching power supply device Download PDFInfo
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- CN109327131B CN109327131B CN201811146621.5A CN201811146621A CN109327131B CN 109327131 B CN109327131 B CN 109327131B CN 201811146621 A CN201811146621 A CN 201811146621A CN 109327131 B CN109327131 B CN 109327131B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
The invention relates to a current-limiting switch circuit and a switching power supply device, wherein the current-limiting switch circuit comprises: the first input end of the voltage control module receives the associated voltage, the second input end of the voltage control module receives the reference voltage, the voltage control module generates a charging control signal according to the associated voltage and the reference voltage, and the charging control signal is output through the output end of the voltage control module; the input end of the switch module receives the input current of the input voltage end and determines whether to charge the output voltage end according to the charging control signal; the compensation module is suitable for generating a compensation current according to the input current of the input voltage end, and the compensation current is used for providing compensation for the output voltage end. The technical scheme of the invention can effectively compensate the voltage drop caused by line loss, cable impedance, contact impedance and the like.
Description
Technical Field
The present invention relates to the field of electronic circuits, and in particular, to a current-limiting switching circuit and a switching power supply device.
Background
With the development of scientific technology, the functions of electronic equipment become more and more powerful, and higher requirements are also put forward on the used power supply. In general, the power supply voltage of the power supply cannot completely match the voltage required by the electronic device for normal operation, so that the power supply voltage needs to be converted by a voltage conversion device (such as a switching power supply, a voltage stabilizing circuit, etc.) and then supplied to the electronic device.
In order to charge a plurality of electronic devices simultaneously, in the prior art, a plurality of charging branches are usually externally connected to an output terminal of a voltage conversion device, and in specific application, a plurality of usb (universal Serial bus) interfaces are externally connected to an output port of the voltage conversion device, so that the plurality of electronic devices can be charged simultaneously. In order to compensate for voltage drop caused by line loss, cable impedance, contact impedance, and the like between the USB interface and the electronic device, a method of increasing the voltage at the USB interface is generally adopted to ensure that the electronic device has a higher charging rate.
The voltage received by the input end of each branch circuit is from the output end of the same voltage conversion device. If voltage compensation is carried out on a certain loaded branch, the output voltages of other no-load branches can rise along with the voltage compensation, so that the output voltages of the no-load branches exceed the specification, the waste of electric energy can be caused, and the service life of the voltage conversion device can be influenced.
How to provide a current-limiting switch circuit capable of accurately compensating the line loss is an urgent problem to be solved.
Disclosure of Invention
The invention solves the technical problem of how to provide a current-limiting switch circuit capable of accurately compensating the line loss.
To solve the above technical problem, an embodiment of the present invention provides a current-limiting switch circuit, which has an input voltage terminal and an output voltage terminal, and includes: the voltage control module generates a charging control signal according to the correlation voltage and the reference voltage, the charging control signal is output through an output end of the voltage control module, and the correlation voltage changes along with the change of the voltage of an output voltage end; the input end of the switch module receives the input current of the input voltage end and determines whether to charge the output voltage end according to the charging control signal; the compensation module is suitable for generating a compensation current according to the input current of the input voltage end, and the compensation current is used for providing compensation for the output voltage end.
Optionally, the current limit switch circuit further includes: the sampling module is suitable for receiving the input current of the input voltage end and converting the input current into control voltage, and the control voltage is used for controlling the size of the compensation current generated by the compensation module.
Optionally, the compensation module includes: the input end of the first current source is connected with a power supply, and the control end of the first current source receives the control voltage; a first end of the first resistor is connected with the output end of the first current source, and a second end of the first resistor is grounded; and the control end of the second current source is connected with the output end of the first current source, the output end of the second current source is grounded, and the input end of the second current source is the output end of the compensation module.
Optionally, when the current of the input voltage terminal increases, the control voltage received by the control terminal of the first current source increases, the first current generated by the first current source increases, the voltage of the first terminal of the first resistor increases, the second current generated by the second current source increases, and the second current provides compensation for the output voltage terminal, so that the output voltage of the output voltage terminal increases.
Optionally, the current limit switch circuit further includes: a voltage division module adapted to receive a voltage of the output voltage terminal and generate the associated voltage.
Optionally, the voltage dividing module includes: a first end of the second resistor is connected with the output voltage end; and the first end of the third resistor is connected with the second end of the second resistor, the second end of the third resistor is grounded, and the first end of the third resistor is the output end of the voltage division module.
Optionally, the switch module includes: and the source electrode of the field effect transistor receives the input current, the drain electrode of the field effect transistor is connected with the output voltage end, and the grid electrode of the field effect transistor receives the charging control signal.
Optionally, when the circuit initially operates, the associated voltage is smaller than the reference voltage, and the charging control signal controls the field effect transistor to turn on to charge the output voltage terminal; and when the voltage difference between the correlation voltage and the reference voltage is reduced to 0, the correlation voltage is equal to the reference voltage, and the output voltage of the output voltage end reaches a stable state.
Optionally, the voltage control module includes: an operational amplifier having a first input receiving the reference voltage, a second input receiving the correlation voltage, and an output generating the charge control signal.
Optionally, the current-limiting switch circuit further includes a fourth resistor, a first end of the fourth resistor receives the charging control signal, and a second end of the fourth resistor is connected to the control end of the switch module.
Optionally, the current limit switch circuit further includes: the overcurrent detection circuit is suitable for receiving a preset current and the input current of the input voltage end and generating an overcurrent control signal according to a comparison result of the input current and the preset current; the overcurrent control switch, overcurrent control switch's input is connected the input of switch module, overcurrent control switch's output is connected switch module's control end, overcurrent control switch's control end receives overcurrent control signal, overcurrent control switch is in switch on or turn-off under overcurrent control signal's control.
In order to solve the above technical problem, an embodiment of the present invention further provides a switching power supply device, which includes a switching power supply and the current-limiting switching circuit.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the current-limiting switch circuit comprises a voltage control module, a switch module and a compensation module, wherein a first input end of the voltage control module receives a relevant voltage, a second input end of the voltage control module receives a reference voltage, the voltage control module generates a charging control signal according to the relevant voltage and the reference voltage, the charging control signal is output through an output end of the voltage control module, and the relevant voltage changes along with the change of the voltage of an output voltage end; the input end of the switch module receives the input current of the input voltage end and determines whether to charge the output voltage end according to the charging control signal; the compensation module is suitable for generating a compensation current according to the input current of the input voltage terminal, and the compensation current is used for providing compensation for the output voltage terminal. Therefore, the voltage drop caused by the line loss can be effectively compensated, and the charging rate of the load is improved. In addition, the voltage of the output voltage end of the current-limiting switch circuit can be controlled, and the no-load output voltage is prevented from exceeding the specification.
Further, the compensation module in the technical scheme of the invention comprises: the circuit comprises a first current source, a first resistor and a second current source, wherein the input end of the first current source is connected with a power supply, and the control end of the first current source receives a control voltage; the first end of the first resistor is connected with the output end of the first current source, and the second end of the first resistor is grounded; the control end of the second current source is connected with the output end of the first current source, the output end of the second current source is grounded, and the input end of the second current source is the output end of the compensation module. Therefore, the output voltage end can be compensated only through the matching of the controllable current source and the resistor, the circuit structure is effectively simplified, and the circuit cost is optimized.
Further, the switch module in the technical scheme of the invention comprises a field effect transistor, wherein a source electrode of the field effect transistor receives the input current, a drain electrode of the field effect transistor is connected with the output voltage end, and a grid electrode of the field effect transistor receives the charging control signal. Because the field effect transistor has stronger temperature stability and radiation resistance, the voltage stability of the output voltage end can be effectively improved by using the field effect transistor as a switch module of the circuit.
Drawings
FIG. 1 is a schematic diagram of a prior art current limiting switching circuit;
FIG. 2 is a schematic diagram of another prior art current limiting switching circuit;
FIG. 3 is a schematic diagram of a current-limiting switch circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a specific application scenario according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, a detailed description of the prior art and a specific embodiment thereof will be provided below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
Fig. 1 is a schematic diagram of a current-limiting switch circuit in the prior art.
Referring to fig. 1, the current-limiting switch circuit has an input terminal IN and a plurality of output terminals OUT1, OUT2, … … OUTn, the input terminal IN is connected to an output terminal of the voltage conversion device 1, the voltage conversion device 1 may be a switching power supply or a voltage stabilizing circuit, the voltage conversion device 1 may implement dc-dc voltage conversion or ac-dc voltage conversion, and output the converted dc voltage to the current-limiting switch circuit, the current-limiting switches K1 and K2 … … on each output branch only limit the magnitude of the output current, and do not have a function of adjusting the output voltages of the output terminals OUT1, OUT2, … … OUTn. IN practical applications, IN order to avoid the idle voltage of the idle branches exceeding the specification, the voltage at the input terminal IN of the current-limiting switch circuit needs to be limited, which causes the voltage of the loaded branch to be limited, and affects the load charging rate.
Fig. 2 is a schematic diagram of another current-limiting switch circuit in the prior art.
Referring to fig. 2, the current-limiting switch circuit has an input terminal IN and a plurality of output terminals OUT1, OUT2, and … … OUTn, the input terminal IN is connected to an output terminal of the voltage conversion device 1, the voltage conversion device 1 may be a switching power supply or a voltage stabilizing circuit, the voltage conversion device 1 may implement dc-dc voltage conversion or ac-dc voltage conversion, and output the converted dc voltage to the current-limiting switch circuit, each output branch is sequentially provided with a first resistor R1, a second resistor R2 … …, and an N-th resistor Rn, and the current sampling module 2 collects current flowing through each branch and adjusts voltage of the input terminal IN of the current-limiting switch circuit by adjusting voltage of the control terminal FB of the voltage conversion device 1. IN specific implementation, when the voltage of the control terminal FB increases, the voltage of the input terminal IN of the current-limiting switch circuit increases because the voltage difference between the voltage of the control terminal FB and the voltage of the input terminal IN of the current-limiting switch circuit is constant. However, IN the current-limiting switch circuit, the voltage increase of the input terminal IN caused by any branch will inevitably cause the voltage increase of the input voltage of other branches, and further may cause the output voltage of the idle branch to exceed the specification.
The current-limiting switching circuit in the embodiment of the invention can effectively compensate the voltage drop caused by line loss through the cooperation of the voltage control module, the switching module and the compensation module, and ensures that the load is charged with high efficiency. In addition, the voltage of the output voltage end of the current-limiting switch circuit can be controlled, and the no-load output voltage is prevented from exceeding the specification.
Fig. 3 is a schematic structural diagram of a current-limiting switch circuit according to an embodiment of the present invention.
In this embodiment, the current-limiting switch circuit may be an integrated circuit chip, or may be a board-level circuit composed of various discrete devices. The current-limiting switch circuit can be used for being connected between the voltage conversion device and a load, and can also be used as a sub-circuit which plays a role in limiting current in an integrated circuit.
Specifically, the voltage conversion device may be a switching power supply, a voltage regulator circuit, or the like, and may implement dc-dc voltage conversion (e.g., voltage conversion of 40V high-voltage dc-5V low-voltage dc) or ac-dc voltage conversion (e.g., voltage conversion of 220V high-voltage ac-5.5V low-voltage dc).
Referring to fig. 3, the current limit switch circuit has an input voltage terminal IN and an output voltage terminal OUT, and the current limit switch circuit may include: a voltage control module 4, a first input end of the voltage control module 4 receiving a correlation voltage VB, a second input end of the voltage control module 4 receiving a reference voltage VREF, the voltage control module 4 generating a charging control signal VC according to the correlation voltage VB and the reference voltage VREF, the charging control signal VC being output via an output end of the voltage control module 4, wherein the correlation voltage VB varies with a variation in voltage of an output voltage terminal OUT; the input end of the switch module 2 receives the input current of the input voltage end IN and determines whether to charge the output voltage end OUT according to the charging control signal VC; a compensation module 3 adapted to generate a compensation current according to the input current of the input voltage terminal IN, the compensation current being used to provide compensation to the output voltage terminal OUT.
Specifically, the input voltage terminal IN may be connected to an output terminal of the voltage conversion device, and receive the converted dc voltage; the output voltage terminal OUT may be a USB port, and the output voltage terminal OUT is used for connecting a load, which may be various electronic devices.
IN a non-limiting embodiment, the compensation module 3 may directly receive an input current of the input voltage terminal IN, and the input current is used for controlling the magnitude of the compensation current generated by the compensation module 3.
In another non-limiting embodiment, the compensation module 3 may receive a control voltage, the control voltage is converted from the input current, and the magnitude of the compensation current generated by the compensation module 3 is controlled by the control voltage. Hereinafter, the present application will be described in detail by taking an example in which the compensation module 3 controls the compensation current according to the magnitude of the control voltage.
Further, the current limit switching circuit may further include: the sampling module 1 is adapted to receive an input current of the input voltage terminal IN and convert the input current into a control voltage.
Further, the sampling module 1 may include a sampling resistor Rsense and a current detection and conversion circuit 11, and the current detection and conversion circuit 11 may collect the input current flowing through the sampling resistor Rsense and convert the input current into the control voltage.
Furthermore, since the current value of the input current is small, the current detection and conversion circuit 11 may perform voltage conversion and linear amplification on the input current, and the linearly amplified voltage is provided to the compensation module 3 as a control voltage.
It should be noted that, the current detection and conversion circuit 11 for converting the input current into the control voltage may adopt a current-voltage conversion circuit in the prior art, which is not limited in this embodiment of the present invention.
Further, the compensation module 3 may include: a first current source I1, an input terminal of the first current source I1 is connected to a power supply VCC, and a control terminal of the first current source I1 receives the control voltage; a first resistor R1, a first end of the first resistor R1 is connected to the output end of the first current source I1, and a second end of the first resistor R1 is grounded; a second current source I2, a control terminal of the second current source I2 is connected to the output terminal of the first current source I1, an output terminal of the second current source I2 is grounded, and an input terminal of the second current source I2 is the output terminal of the compensation module 3.
Further, the power supply VCC may be a power supply external to the current-limiting switching circuit, or the power supply VCC may be integrated in the current-limiting switching circuit. Specifically, the power source VCC may be a dc power source, and the voltage value of the power source VCC may be a fixed value or an adjustable value to adapt to power supply requirements for different occasions.
IN addition, IN order to save circuit area, the input terminal of the first current source I1 may be connected to the input voltage terminal IN, and the first current source I1 is powered by the dc voltage of the input voltage terminal IN.
Specifically, the first resistor R1 may be a fixed-resistance or variable-resistance resistor to meet the requirements of different applications.
Furthermore, the first resistor R1 may be formed by connecting a plurality of sub-resistors in parallel or in series.
Further, the current limit switching circuit may further include: a voltage dividing module 5, said voltage dividing module 5 being adapted to receive the voltage of said output voltage terminal OUT and generate said associated voltage VB.
Further, the voltage dividing module 5 may include: a second resistor R2, a first end of the second resistor R2 being connected to the output voltage terminal OUT; a third resistor R3, wherein a first end of the third resistor R3 is connected to a second end of the second resistor R2, a second end of the third resistor R3 is grounded, and a first end of the third resistor R3 is an output end of the voltage divider module 5.
In specific implementation, the resistance of the second resistor R2 and the resistance of the third resistor R3 may be the same or different; the second resistor R2 and/or the third resistor R3 may be fixed resistance or variable resistance resistors to meet the requirements of different applications.
Further, the second resistor R2 and/or the third resistor R3 may be formed by connecting a plurality of sub resistors in parallel or in series.
Further, the switch module 2 may include: and the source electrode of the field effect transistor P receives the input current, the drain electrode of the field effect transistor P is connected with the output voltage end OUT, and the grid electrode of the field effect transistor P receives the charging control signal VC.
In a specific implementation, the field effect transistor P may be a P-type field effect transistor.
As a variation, the field effect transistor P may also be an N-type field effect transistor, in which the drain of the field effect transistor P receives the input current, the source of the field effect transistor P is connected to the output voltage terminal OUT, and the gate of the field effect transistor P receives the charge control signal VC.
It is understood that a person skilled in the art can adaptively select a specific type of the field effect transistor P according to different applications, and the embodiment of the present invention is not limited thereto.
Further, the voltage control module 4 may include: and a first input end of the operational amplifier receives the reference voltage VREF, a second input end of the operational amplifier receives the associated voltage VB, and an output end of the operational amplifier generates the charging control signal VC.
Specifically, the first input end of the operational amplifier is a negative input end, and the second input end of the operational amplifier is a positive input end. The magnitude of the charge control signal VC is the product of the voltage difference of the reference voltage VREF and the associated voltage VB and the operational amplifier gain.
In order to prevent the impact of the overcurrent on the components and the load in the circuit, further, the current-limiting switching circuit may further include: the overcurrent detection circuit 6 is suitable for receiving a preset current and the input current of the input voltage end IN, and generating an overcurrent control signal SW according to a comparison result of the input current and the preset current; the overcurrent control switch S, the input of overcurrent control switch S is connected the input of switch module 2, the output of overcurrent control switch S is connected the control end of switch module 2, the control end of overcurrent control switch S receives overcurrent control signal SW, overcurrent control switch S is in overcurrent control signal SW' S control switches on or cuts off.
Specifically, the input end of the over-current control switch S is connected to the source electrode of the field effect transistor P, the output end of the over-current control switch S is connected to the gate electrode of the field effect transistor P, and the control end of the over-current control switch S receives the over-current control signal SW.
When the overcurrent control switch S is closed, the source and the gate of the field effect transistor P are connected together, that is, the voltage difference between the source and the gate of the field effect transistor P is 0, and the field effect transistor P is turned off.
The over-current detection circuit 6 in this embodiment may be an over-current detection circuit in the prior art, which is not limited in this embodiment of the present invention.
Further, the current-limiting switch circuit may further include a fourth resistor R4, a first end of the fourth resistor R4 receives the charging control signal VC, and a second end of the fourth resistor R4 is connected to the control end of the switch module 2. The fourth resistor R4 can isolate the operational amplifier from the over-current detection circuit 6 and the over-current control switch S to avoid the interaction between the over-current control signal SW and the charging control signal VC.
Please refer to fig. 3 and fig. 4, wherein fig. 4 is a schematic diagram of a specific application scenario according to an embodiment of the present invention.
The output end of the voltage conversion device a is connected with a plurality of branches (for example, two branches, one branch is a loaded branch, and the other branch is an unloaded branch), and the plurality of branches can adopt current-limiting switch circuits with the same structure.
For the loaded branch, it has a first input voltage terminal IN1 and a first output voltage terminal OUT 1. When the current-limiting switch circuit initially operates, the associated voltage VB is smaller than a first reference voltage VREF1, and the charging control signal VC controls the field effect transistor P to be turned on to charge the first output voltage terminal OUT 1. The voltage VOUT1 of the first output voltage terminal OUT1 can be calculated by the following formula:
VOUT1＝VREF1*(R2+R3)/R3
the VREF1 is a voltage value of a first reference voltage in the loaded branch, R2 is a resistance value of a second resistor in the voltage division module, and R3 is a resistance value of a third resistor in the voltage division module.
In a specific implementation, by adjusting the magnitude of the voltage value of the first reference voltage VREF1, the magnitude of the voltage value of the first output voltage terminal OUT1 can be controlled, that is, the magnitude of the charging voltage provided to the load can be controlled.
Since the losses of the sampling resistor Rsense and the field effect transistor P are negligible, when the correlated voltage VB is equal to the first reference voltage VREF, the voltage of the first output voltage terminal OUT1 reaches a steady state. If there is no loss in the line between the first output voltage terminal OUT1 and the load, the expected charging voltage received by the load is the voltage value of the first output voltage terminal OUT1 at which the voltage reaches the steady state. In practice, however, the charging line between the first output voltage terminal OUT1 and the load tends to be long (e.g., 0.5m or 1 m). Therefore, when the charging current flows through the charging circuit, relatively large line loss is caused, and the larger the charging current is, the larger the line loss is. In this case, the actual charging voltage received by the load is less than the expected charging voltage, which affects the efficiency of charging the load.
IN this embodiment, the input current of the first input voltage terminal IN1 flows through a charging line connected to the load, and a line loss is generated on the charging line. To compensate for the line losses, the sampling module 1 may sample the input current of the first input voltage terminal IN1, and converts the input current into a control voltage, which controls a first current source I1 to generate a first current, the first current flows through a first resistor R1, the voltage at the first end of the first resistor R1 is provided to the control end of a second current source I2, so that the second current source I2 generates a compensation current, which flows through a second resistor R2, to increase the voltage of the first output voltage terminal OUT1, wherein the load receives a charge of the increased voltage minus the line loss, that is, the compensation module 3 increases the voltage of the first output voltage terminal OUT1, thereby compensating the line loss voltage of the charging line, so that the voltage received by the load is still the expected charging voltage.
During the process of charging the load, when the current of the first input voltage terminal IN1 increases, the line loss of the charging circuit increases. At this time, the control voltage received by the control terminal of the first current source I1 increases, the first current generated by the first current source I1 increases, the voltage of the first terminal of the first resistor R1 increases, the compensation current generated by the second current source I2 increases, and the compensation voltage for the first output voltage terminal OUT1 increases, so that the voltage received by the load is still the desired charging voltage.
In addition, by adjusting the resistance of the first resistor R1, the compensation current generated by the second current source I2 can be adjusted, and the voltage compensated to the first output voltage terminal OUT1 can be adjusted.
In the process of charging the load, when the input current received by the over-current detection circuit 6 exceeds the preset current, an over-current control signal SW is generated. In response to the overcurrent control signal SW, the overcurrent control switch S is closed, thereby connecting the source of the field effect transistor P and the gate of the field effect transistor P together. At this time, when the voltage difference between the source and the gate of the field effect transistor P is 0, no current passes through the field effect transistor P, so that the impact of overcurrent on the circuit component and the load can be effectively avoided.
For the unloaded branch, it has a second input voltage terminal IN2 and a second output voltage terminal OUT2, and the second output voltage terminal OUT2 is not connected to a load, i.e. unloaded.
Specifically, when the current-limiting switch circuit is initially operated, the associated voltage VB is smaller than the second reference voltage VREF2, the charging control signal VC controls the field effect transistor P to be turned on to charge the second output voltage terminal OUT2, and a voltage difference between the associated voltage VB and the second reference voltage VREF2 decreases as the output voltage of the second output voltage terminal OUT2 increases; when the voltage difference between the associated voltage VB and the second reference voltage VREF2 is reduced to 0, the associated voltage VB is equal to the second reference voltage VREF2, and the output voltage of the second output voltage terminal OUT2 reaches a steady state. Since the correlation voltage VB is in linear proportional relationship with the second reference voltage VREF2, in order to prevent the output voltage of the second output voltage terminal OUT2 from exceeding the specification, the output voltage of the second output voltage terminal OUT2 can be controlled within a reasonable range only by reasonably setting the voltage value of the second reference voltage VREF 2.
Further, an embodiment of the present invention further provides a switching power supply device (not shown), which includes a switching power supply and the aforementioned current-limiting switching circuit.
Furthermore, the switching power supply may include a BUCK circuit, a BOOST circuit, or a BUCK-BOOST circuit, an output terminal of the switching power supply may be connected to an input voltage terminal of the current-limiting switch circuit, and an output voltage terminal of the current-limiting switch circuit may be connected to a load, so as to charge the load.
It should be noted that the voltage values of the "high voltage" and the "low voltage" in the embodiment of the present invention are not particularly limited, as long as the voltage value of the high voltage is higher than the voltage value of the low voltage. For example, a voltage value of a high voltage can be recognized as a logic 1, and a voltage value of a low voltage can be recognized as a logic 0.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A current-limiting switching circuit having an input voltage terminal and an output voltage terminal, comprising:
the voltage control module generates a charging control signal according to the correlation voltage and the reference voltage, the charging control signal is output through an output end of the voltage control module, and the correlation voltage changes along with the change of the voltage of an output voltage end;
the input end of the switch module receives the input current of the input voltage end and determines whether to charge the output voltage end according to the charging control signal; the switch module includes: the source electrode of the field effect transistor receives the input current, the drain electrode of the field effect transistor is connected with the output voltage end, and the grid electrode of the field effect transistor receives the charging control signal; when the circuit initially operates, the associated voltage is smaller than the reference voltage, and the charging control signal controls the field effect transistor to be switched on to charge the output voltage end; as the output voltage of the output voltage terminal increases, the voltage difference between the correlation voltage and the reference voltage decreases, and when the voltage difference between the correlation voltage and the reference voltage decreases to 0, the correlation voltage is equal to the reference voltage, and the output voltage of the output voltage terminal reaches a steady state; for the no-load branch circuit, adjusting the reference voltage corresponding to the no-load branch circuit to enable the output voltage of the no-load branch circuit to be smaller than the specification voltage;
the compensation module is suitable for generating a compensation current according to the input current of the input voltage end, and the compensation current is used for providing compensation for the output voltage end.
2. The current-limiting switch circuit of claim 1, further comprising:
the sampling module is suitable for receiving the input current of the input voltage end and converting the input current into control voltage, and the control voltage is used for controlling the size of the compensation current generated by the compensation module.
3. The current-limiting switch circuit of claim 2, wherein the compensation module comprises:
the input end of the first current source is connected with a power supply, and the control end of the first current source receives the control voltage;
a first end of the first resistor is connected with the output end of the first current source, and a second end of the first resistor is grounded;
and the control end of the second current source is connected with the output end of the first current source, the output end of the second current source is grounded, and the input end of the second current source is the output end of the compensation module.
4. The current-limiting switch circuit of claim 3,
when the current of the input voltage end is increased, the control voltage received by the control end of the first current source is increased, the first current generated by the first current source is increased, the voltage of the first end of the first resistor is increased, the second current generated by the second current source is increased, and the second current provides compensation for the output voltage end, so that the output voltage of the output voltage end is increased.
5. The current-limiting switch circuit of claim 1, further comprising:
a voltage division module adapted to receive a voltage of the output voltage terminal and generate the associated voltage.
6. The current-limiting switch circuit of claim 5, wherein the voltage divider module comprises:
a first end of the second resistor is connected with the output voltage end;
and the first end of the third resistor is connected with the second end of the second resistor, the second end of the third resistor is grounded, and the first end of the third resistor is the output end of the voltage division module.
7. The current-limiting switch circuit of claim 1, wherein the voltage control module comprises:
an operational amplifier having a first input receiving the reference voltage, a second input receiving the correlation voltage, and an output generating the charge control signal.
8. The current-limiting switch circuit of claim 1, further comprising a fourth resistor, wherein a first end of the fourth resistor receives the charge control signal, and a second end of the fourth resistor is connected to the control end of the switch module.
9. The current-limiting switch circuit of claim 1, further comprising:
the overcurrent detection circuit is suitable for receiving a preset current and the input current of the input voltage end and generating an overcurrent control signal according to a comparison result of the input current and the preset current;
the overcurrent control switch, overcurrent control switch's input is connected the input of switch module, overcurrent control switch's output is connected switch module's control end, overcurrent control switch's control end receives overcurrent control signal, overcurrent control switch is in switch on or turn-off under overcurrent control signal's control.
10. A switching power supply apparatus comprising a switching power supply, characterized by further comprising the current limiting switching circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811146621.5A CN109327131B (en) | 2018-09-29 | 2018-09-29 | Current-limiting switch circuit and switching power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811146621.5A CN109327131B (en) | 2018-09-29 | 2018-09-29 | Current-limiting switch circuit and switching power supply device |
Publications (2)
| Publication Number | Publication Date |
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| CN109327131A CN109327131A (en) | 2019-02-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112015220B (en) * | 2019-05-29 | 2022-02-11 | 晶豪科技股份有限公司 | Current limiter |
| CN110244111B (en) * | 2019-07-19 | 2021-06-29 | 广东浪潮大数据研究有限公司 | Plate-end power supply near-end and far-end voltage detection device |
| CN111176362A (en) * | 2020-01-10 | 2020-05-19 | 丰县云鸣电子科技有限公司 | Double-line loss compensation method based on DCDC converter |
| CN111653304B (en) * | 2020-04-27 | 2022-07-08 | 中国科学院微电子研究所 | Memory and current-limiting protection circuit thereof |
| CN112017715B (en) * | 2020-08-24 | 2022-12-06 | 厦门半导体工业技术研发有限公司 | Resistive random access memory and protection circuit thereof |
| CN113098236B (en) * | 2021-04-16 | 2022-01-07 | 苏州力生美半导体有限公司 | Switching power supply and output voltage compensation circuit thereof |
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| CN101562452A (en) * | 2008-12-30 | 2009-10-21 | 天津南大强芯半导体芯片设计有限公司 | Voltage-current converter circuit |
| CN101714817A (en) * | 2009-12-09 | 2010-05-26 | 杭州士兰微电子股份有限公司 | Voltage converter with line loss compensation |
| CN102832806A (en) * | 2012-09-14 | 2012-12-19 | 成都芯源系统有限公司 | Switch voltage stabilizing circuit and voltage feedback method thereof |
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| CN101562452A (en) * | 2008-12-30 | 2009-10-21 | 天津南大强芯半导体芯片设计有限公司 | Voltage-current converter circuit |
| CN101714817A (en) * | 2009-12-09 | 2010-05-26 | 杭州士兰微电子股份有限公司 | Voltage converter with line loss compensation |
| CN102832806A (en) * | 2012-09-14 | 2012-12-19 | 成都芯源系统有限公司 | Switch voltage stabilizing circuit and voltage feedback method thereof |
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