CN113157037A - Low dropout regulator and power supply equipment - Google Patents
Low dropout regulator and power supply equipment Download PDFInfo
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- CN113157037A CN113157037A CN202110418958.2A CN202110418958A CN113157037A CN 113157037 A CN113157037 A CN 113157037A CN 202110418958 A CN202110418958 A CN 202110418958A CN 113157037 A CN113157037 A CN 113157037A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
Abstract
The embodiment of the application discloses low dropout regulator and power supply equipment, low dropout regulator, including the voltage division module, the switch module, feedback module and energy storage module, the first end of voltage division module is connected with the anodal of input power and the first end of switch module, the second end of voltage division module is connected with the second end of switch module and the first end of feedback module, the third end of switch module is connected with the second end of feedback module and the first end of energy storage module, the second end of energy storage module is connected with the third end of voltage division module and the negative pole of input power, wherein, the third end of switch module, the tie point between the second end of feedback module and the first end of energy storage module is first connecting point, switch module is used for the voltage based on feedback module both ends switches over the on-off state. By the mode, the function of the low dropout linear regulator can be realized through a simpler circuit structure, and the cost is lower.
Description
Technical Field
The present application relates to the field of electronic circuit technologies, and in particular, to a low dropout regulator and a power supply apparatus.
Background
In power supply, a Low Dropout Regulator (LDO) is widely used in different output voltage domains due to the advantages of less peripheral component requirements, Low output noise, small output ripple, simple circuit structure, and the like.
In the prior art, a Buck conversion circuit (Buck circuit) or a transformer and a rectifier are usually used to implement the function of the low dropout linear regulator. However, the buck converter circuit is complex in circuit structure and difficult to implement, and the transformer plus rectifier method results in an oversized low dropout regulator and higher cost.
Disclosure of Invention
The embodiment of the application aims to provide the low dropout regulator and the power supply equipment, the function of the low dropout regulator can be realized through a simpler circuit structure, and the cost is lower.
To achieve the above object, in a first aspect, the present application provides a low dropout linear regulator, comprising:
the voltage division module, the switch module, the feedback module and the energy storage module;
the first end of the voltage division module is connected with the positive electrode of an input power supply and the first end of the switch module, the second end of the voltage division module is connected with the second end of the switch module and the first end of the feedback module, the third end of the switch module is connected with the second end of the feedback module and the first end of the energy storage module, the second end of the energy storage module is connected with the third end of the voltage division module and the negative electrode of the input power supply, and a connection point among the third end of the switch module, the second end of the feedback module and the first end of the energy storage module is a first connection point;
the switch module is used for switching on and off states based on the voltages at the two ends of the feedback module so as to control the connection state between the anode of the input power supply and the first connection point, wherein the voltage at the first end of the feedback module is the divided voltage of the voltage dividing module on the input power supply, and the voltage at the second end is the voltage on the first connection point.
In an alternative mode, the voltage division module comprises a first resistor and a second resistor which are connected in series;
the non-series end of the first resistor is connected with the anode of the input power supply, the connecting point between the first resistor and the second resistor is connected with the second end of the switch module, and the non-series end of the second resistor is connected with the cathode of the input power supply.
In an optional mode, the voltage division module further comprises a voltage stabilizing diode;
and the anode of the voltage stabilizing diode is connected with the cathode of the input power supply, and the cathode of the voltage stabilizing diode is connected with the non-series end of the second resistor.
In an alternative mode, the switch module includes a first switch tube;
the control end of the first switch tube is connected with the second end of the voltage division module, the first end of the first switch tube is connected with the first connecting point, and the second end of the first switch tube is connected with the positive electrode of the input power supply.
In an optional mode, the switch module further comprises a third resistor and a clamping diode;
the first end of the third resistor is connected with the cathode of the clamping diode and the control end of the first switch tube, the second end of the third resistor is connected with the second end of the voltage division module, and the anode of the clamping diode is connected with the first connection point.
In an alternative mode, the feedback module comprises a fourth resistor and a first capacitor which are connected in parallel;
the first end of the circuit after the fourth resistor and the first capacitor are connected in parallel is connected with the second end of the voltage division module and the second end of the switch module, and the second end of the circuit after the fourth resistor and the first capacitor are connected in parallel is connected with the first connecting point.
In an alternative mode, the energy storage module comprises a second capacitor;
and two ends of the second capacitor are respectively connected with the first connecting point and the negative electrode of the input power supply.
In an optional mode, the low dropout regulator further comprises a current limiting module;
the current limiting module is used for limiting current input into the first end of the switch module.
In an optional mode, the current limiting module comprises a fifth resistor and a first diode;
the first end of the fifth resistor is connected with the anode of the input power supply, the second end of the fifth resistor is connected with the anode of the first diode, and the cathode of the first diode is connected with the first end of the switch module.
In an optional mode, the low dropout linear regulator further comprises a third capacitor;
and two ends of the third capacitor are respectively connected with the anode of the input power supply and the cathode of the input power supply.
In a second aspect, embodiments of the present application provide a power supply apparatus including a low dropout regulator as described in any one of the above.
The beneficial effects of the embodiment of the application are that: the low dropout regulator provided by the application comprises a voltage division module, a switch module, a feedback module and an energy storage module, wherein a first end of the voltage division module is connected with a positive electrode of an input power supply and a first end of the switch module, a second end of the voltage division module is connected with the first end of the switch module and the first end of the feedback module, a second end of the voltage division module is connected with the second end of the switch module and the first end of the feedback module, a third end of the switch module is connected with the second end of the feedback module and the first end of the energy storage module, a second end of the energy storage module is connected with the third end of the voltage division module and a negative electrode of the input power supply, a connection point between the third end of the switch module, the second end of the feedback module and the first end of the energy storage module is a first connection point, and voltage on the first connection point is used as power supply voltage of a subsequent load, therefore, when the voltage on the first connection point changes (increases or decreases), the change simultaneously acts on the switch module to enable the switch module to switch the switch state of the switch module so as to reversely regulate the voltage on the first connecting point, thereby enabling the output voltage to be kept stable, namely realizing the function of the low-dropout linear voltage regulator, and each module can be realized by a simple hardware circuit, and the cost is lower.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a low dropout regulator according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a low dropout regulator according to another embodiment of the present application;
fig. 3 is a schematic circuit diagram of a low dropout linear regulator according to an embodiment of the present disclosure;
fig. 4 is a characteristic curve diagram of an IGBT switching tube according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a low dropout regulator according to an embodiment of the present disclosure. As shown in fig. 1, the low dropout regulator includes a voltage dividing module 10, a switching module 20, a feedback module 30 and an energy storage module 40. The first end of the voltage dividing module 10 is connected to the positive electrode of the input power supply 200 and the first end of the switch module 20, the second end of the voltage dividing module 10 is connected to the second end of the switch module 20 and the first end of the feedback module 30, the second end of the energy storage module 40 is connected to the third end of the voltage dividing module 10 and the negative electrode of the input power supply 200, and the third end of the switch module 20 is connected to the second end of the feedback module 30 and the first end of the energy storage module 40 at the first connection point P1.
Specifically, the switching state of the switching module 20 is determined by the voltage across the feedback module 30, and the switching state of the switching module 20 includes both the on or off of the switching module 20 and the on degree of the switching module 20. In other words, the voltage across the feedback module 30 can control the switch module 20 to be in the on state or in the off state, and at the same time, can control the magnitude of the current flowing through the switch module 20.
The voltage at the end of the feedback module 30 connected to the voltage divider module 10 is the divided voltage of the voltage divider module 30 on the input power supply 200, and the end of the feedback module 30 connected to the first connection point P1 is the voltage at the first connection point P1.
The switching state of the switching module 20 determines the connection state between the positive electrode of the input power source 200 and the first connection point P1. When the switch module 20 is fully turned on, the voltage of the first connection point P1 is the voltage of the input power source 200, when the switch module 20 is turned on and off, the voltage of the first connection point P1 is the voltage of the input power source 200 minus the voltage drop of the switch module 20, and when the switch module 20 is fully turned off, the connection between the first connection point P1 and the input power source 200 is disconnected.
In practical applications, when the voltage at the first connection point P1 changes (increases or decreases), the voltage change will simultaneously act on the switch module 20, so that the switch module 20 switches its switch state. Furthermore, since the switching module 20 switches its switching state, the connection state between the input power 200 and the energy storage module 40 is changed accordingly, so as to adjust the voltage at the first connection point P1 reversely, thereby keeping the output voltage stable, i.e. implementing the function of the low dropout linear regulator.
For example, when the first connection point P1 is used to connect a load with a larger required power supply voltage, the voltage at the first connection point P1 is reduced. Then, since the voltage at one end of the feedback module 30 connected to the voltage dividing module 10 is not changed, the change value of the voltage difference between the two ends of the feedback module 30 acts on the switch module 20, and the conduction degree of the switch module 20 is increased, even if the equivalent resistance of the switch module 20 is decreased, the voltage input from the input power 200 to the first connection point P1 is increased, so that the voltage at the first connection point P1 is adjusted, and the voltage at the first connection point P1 is kept stable.
It should be noted that the hardware configuration of the low dropout linear regulator 100 shown in fig. 1 is only one example, and that the low dropout linear regulator 100 may have more or less components than those shown in the figure, may combine two or more components, or may have a different configuration of components, and the various components shown in the figure may be implemented in hardware, software, or a combination of hardware and software including one or more signal processing and/or application specific integrated circuits.
For example, in one embodiment, as shown in fig. 2, the low dropout regulator 100 further comprises a current limiting module 50. A first terminal of the current limiting module 50 is connected to the first terminal of the voltage dividing module 10 and the positive electrode of the input power source 200, and a second terminal of the current limiting module 50 is connected to the first terminal of the switch module 20. Specifically, the current limiting module 50 is used to limit the voltage input to the first end of the switch module 20, so as to prevent the switch module 20 from being damaged due to the fact that the input power source 200 is too large, and thus protect the switch module 20.
For better understanding of the present application, the circuit structure of the low dropout linear regulator shown in fig. 3 is taken as an example for further explanation.
As shown in fig. 3, in an embodiment, the voltage dividing module 10 includes a first resistor R1 and a second resistor R2, the first resistor R1 and the second resistor R2 are connected in series and are connected to a second connection point P2, one end of the first resistor R1, which is not connected to the second resistor R2, is connected to the positive terminal VIN + of the input power source 200, and one end of the second resistor R2, which is not connected to the first resistor R1, is connected to the negative terminal VIN-of the input power source 200.
The voltage at the second connection point P2 is the divided voltage of the input power 200 at the second resistor R2, and the divided voltage is also the voltage at one end of the feedback module 30.
Further, the voltage dividing module 10 further includes a voltage stabilizing diode DW1, an anode of the voltage stabilizing diode DW1 is connected to the negative electrode VIN-of the input power source 200, and a cathode of the voltage stabilizing diode DW1 is connected to the non-series end of the second resistor R2 (i.e., the end of the second resistor R2 not connected to the first resistor R1).
The zener diode DW1 is used to provide a reference voltage at the second connection point P2. When the voltage of the positive electrode VIN + of the input power 200 divided by the zener diode DW1 is smaller than the reverse breakdown voltage of the zener diode DW1, the reverse resistance of the zener diode DW1 is large, the reverse current is very small, and the voltage at the second connection point P2 is substantially 0. Only when the voltage division of the positive electrode VIN + of the input power source 200 at the zener diode DW1 is greater than the reverse breakdown voltage of the zener diode DW1, and the zener diode DW1 is in reverse breakdown, the current of the zener diode DW1 can be varied in a wide range, while the voltage across the zener diode DW1 is substantially constant, thereby providing a stable reference voltage.
In one embodiment, the switch module 20 includes a first switch tube. Still take the circuit of the low dropout regulator shown in fig. 3 as an example, wherein the first switch tube corresponds to the IGBT switch tube Q1.
The gate of the IGBT switching transistor Q1 is connected to the second end of the voltage divider module 10, i.e., the gate of the IGBT switching transistor Q1 is connected to the second connection point P2, the emitter of the IGBT switching transistor Q1 is connected to the first connection point P1, and the collector of the IGBT switching transistor Q1 is connected to the positive electrode VIN + of the power supply 200. The first connection point P1 is also the positive pole VOUT + of the output power, i.e. the voltage at the first connection point P1 can be used to provide the supply voltage for the subsequent load.
Referring to fig. 4, fig. 4 is a characteristic curve diagram of an IGBT switch tube according to an embodiment of the present application. As shown in fig. 4, the horizontal axis represents the voltage between the gate and the emitter of the IGBT switch tube, and the vertical axis represents the current when the IGBT switch tube operates. Therefore, the working voltage of the IGBT switch tube is between 5V and 12V, so that the voltage range is wide, and the purpose of controlling the current flowing through the IGBT switch tube can be realized by controlling the voltage between the gate electrode and the emitter electrode of the IGBT switch tube. Meanwhile, for products in a high-voltage working environment, for example, products in an environment of more than 600V, an IGBT switching tube may be generally selected.
It should be understood that the first switch tube can be one of a triode, a MOS tube and an IGBT switch tube.
Taking the example that the first switch tube is selected from a triode, at this time, the base of the triode is the control end of the first switch tube, the emitter of the triode is the first end of the first switch tube, and the collector of the triode is the second end of the first switch tube.
Taking the example that the first switch tube is an MOS tube, at this time, the gate of the MOS tube is the control end of the second switch tube, the source of the MOS tube is the first end of the second switch tube, and the drain of the MOS tube is the second end of the second switch tube.
Taking the example that the first switch tube is an IGBT switch tube, at this time, the gate of the IGBT switch tube is the control end of the second switch tube, the emitter of the IGBT switch tube is the first end of the second switch tube, and the collector of the IGBT switch tube is the second end of the second switch tube.
Optionally, referring to fig. 3 again, the switch module 10 further includes a third resistor R3 and a clamping diode DW 2. A first end of the third resistor R3 is connected to the cathode of the clamp diode DW2 and the gate of the IGBT switching transistor Q1, a second end of the third resistor R3 is connected to the second end of the voltage dividing module, and an anode of the clamp diode DW2 is connected to the first connection point P1.
The third resistor R3 is used to limit the current at the gate of the IGBT Q1, so as to prevent the gate of the IGBT Q1 from being too high and damaging the IGBT Q1. The clamping diode DW2 is used for clamping the voltage between the gate electrode and the emitter electrode of the IGBT switch tube to clamp the voltage between the gate electrode and the emitter electrode of the IGBT switch tube within 12V, namely within the operating voltage range of the IGBT switch tube Q1, so as to protect the IGBT switch tube Q1.
In some embodiments, the feedback module includes a fourth resistor R4 and a first capacitor C1. A first end of a circuit in which the fourth resistor R4 is connected in parallel with the first capacitor C1 is connected to the second end of the voltage dividing module 10 and the second end of the switch module 20, and a second end of the circuit in which the fourth resistor R4 is connected in parallel with the first capacitor C1 is connected to the first connection point P1. That is, the first terminal of the fourth resistor R4 and the first terminal of the first capacitor C1 are both connected to the first connection point P1, and the second terminal of the fourth resistor R4 and the second terminal of the first capacitor C1 are both connected to the second connection point P2.
The fourth resistor R4 is used as a feedback resistor, that is, the voltage across the fourth resistor R4 can be almost equal to the gate and emitter voltages of the IGBT Q1. The first capacitor C1 is used to filter the voltage at the first connection point P1 to reject the interference signal of the voltage at the first connection point P1.
Optionally, the energy storage module 40 includes a second capacitor C2, and two ends of the second capacitor C2 are respectively connected to the first connection point P1 and the negative terminal VIN- (and also the negative terminal VOUT-) of the input power 200.
The second capacitor C2 functions as a storage filter, so that the voltage at the first connection point P1 can be smoothed in the rising and falling processes through the charging and discharging processes of the second capacitor C2, and the voltage at the first connection point P1 is filtered to filter out the high-frequency interference in the voltage at the first connection point P1.
Optionally, the current limiting module 50 includes a fifth resistor R5 and a first diode D1, wherein a first end of the fifth resistor R5 is connected to the positive electrode VIN + of the input power source 200, a second end of the fifth resistor R5 is connected to the anode of the first diode D1, and a cathode of the first diode D1 is connected to the first end of the switching module 20, that is, a cathode of the first diode D1 is connected to the collector of the IGBT switching tube Q1.
The fifth resistor R5 plays a role in current limiting, and the fifth resistor R5 can limit the current of the collector of the IGBT switch tube Q1. The first diode D1 is used to prevent the subsequent voltage from adversely affecting the input voltage, for example, when the first connection point P1 is connected to a load and the voltage at the first connection point P1 fluctuates due to load abnormality, the first diode D1 can prevent the fluctuation from being hidden in the positive electrode VIN + of the input power 200, so as to protect the input power 200.
Further, the low dropout linear regulator further comprises a third capacitor C3. Two ends of the third capacitor C3 are respectively connected to the positive electrode VIN + of the input power source 200 and the negative electrode VIN-of the input power source 200.
The third capacitor C3 is also used for energy storage filtering, and its function is similar to that of the second capacitor C2, which is within the scope easily understood by those skilled in the art and will not be described herein.
In practical applications, when the positive terminal VOUT + and the negative terminal VOUT + of the output power source are not connected to a subsequent load, and immediately after power-up, the input power source 200 forms a reference voltage greater than 0 at the second connection point P2 by dividing the voltage of the first resistor R1 and the second resistor R2, and at this time, the voltage at the first connection point P1 is 0, and the voltage across the fourth resistor R4 is 0, that is, the voltage difference between the gate and the emitter of the IGBT switching tube Q1 is greater than the turn-on voltage of the IGBT switching tube Q1, and the IGBT switching tube Q1 is turned on. Meanwhile, since it takes time for the current of the fifth resistor R5 to be limited and the second capacitor C2 to be charged, the voltage at the first connection point P1 gradually rises.
Then, as the voltage at the first connection point P1 rises and the voltage at the second connection point P2 remains unchanged, the voltage difference between the first connection point P1 and the second connection point P2 gradually decreases, and the voltage between the gate and the emitter of the IGBT switching tube Q1 gradually decreases, resulting in a gradually decreasing conduction degree of the IGBT switching tube Q1. However, due to the energy storage effect of the second capacitor C2, the voltage of the first connection point P1 still keeps rising until the voltage of the first connection point P1 is almost equal to the voltage of the second connection point P2, and the IGBT Q1 is turned off.
Further, when the positive pole VOUT + and the negative pole VOUT-of the output power source are not connected to the subsequent load, the electric energy stored in the second capacitor C2 is discharged to provide the supply voltage for the subsequent load. At this time, the voltage of the first connection point P1 is decreased, and the voltage of the second connection point P2 is kept unchanged, so that the voltage between the gate and the emitter of the IGBT switching tube Q1 is gradually increased, the conduction degree of the IGBT switching tube Q1 is increased, the electric quantity charged to the second capacitor C2 by the input power source 200 is increased, the electric energy stored in the second capacitor C2 is increased, and the voltage of the first connection point P1 is increased. In other words, by controlling the conduction degree of the IGBT Q1, the electric energy discharged from the second capacitor C2 and the electric energy charged into the second capacitor C2 through the input power 200 can reach a dynamic balance process, so that the voltage at the first connection point P1 is kept stable. On the contrary, similarly, when the required power supply voltage of the subsequent load decreases and the discharging speed of the second capacitor C2 is slowed, the required power supply voltage is simultaneously fed back to the IGBT switching tube Q1, and the charging speed of the second capacitor C2 is slowed by controlling the conduction degree of the IGBT switching tube Q1, so that a relatively stable output voltage can be maintained at the first connection point P1.
It can be seen that, according to the different supply voltages required by the connected loads, the conduction degree of the IGBT switch Q1 is correspondingly changed, so that the voltage at the first connection point P1 is kept stable. The low dropout regulator can be suitable for loads of different types while realizing voltage stabilization and voltage reduction functions, and has strong adaptability. As can be seen from fig. 3, the low dropout regulator employs common small-sized electrical components, and has a small size. Meanwhile, the method is realized through a pure hardware circuit, a special chip and the like are not needed, and the cost is low.
The present application also provides a power supply apparatus including the low dropout linear regulator as in any of the above embodiments. In one embodiment, the power device may be an LDO power source, i.e., a switching power source implemented by an LDO.
The low dropout regulator 100 provided by the present application comprises a voltage dividing module 10, a switching module 20, a feedback module 30 and an energy storage module 40, the first end of the voltage dividing module 10 is connected to the positive electrode of the input power supply 200 and the first end of the switch module 20, the second end of the voltage dividing module 10 is connected to the first end of the switch module 20 and the first end of the feedback module 30, the second end of the voltage dividing module 10 is connected to the second end of the switch module 20 and the first end of the feedback module 30, the third end of the switch module 20 is connected to the second end of the feedback module 30 and the first end of the energy storage module 40, the second end of the energy storage module 40 is connected to the third end of the voltage dividing module 10 and the negative electrode of the input power supply 200, a connection point between the third end of the switch module 20, the second end of the feedback module 30 and the first end of the energy storage module 40 is a first connection point P1, and the voltage at the first connection point P1 is used as a supply voltage. Therefore, when the voltage at the first connection point P1 changes (increases or decreases), the change will simultaneously act on the switch module 20, so that the switch module 20 switches its switching state to reversely regulate the voltage at the first connection point P1, thereby keeping the output voltage stable, i.e. realizing the function of the low dropout linear regulator, and each of the above-mentioned modules can be realized by a simple hardware circuit, and the cost is low.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, where technical features in the above embodiments or in different embodiments can also be combined, the steps can be implemented in any order and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (11)
1. A low dropout linear regulator, comprising:
the voltage division module, the switch module, the feedback module and the energy storage module;
the first end of the voltage division module is connected with the positive electrode of an input power supply and the first end of the switch module, the second end of the voltage division module is connected with the second end of the switch module and the first end of the feedback module, the third end of the switch module is connected with the second end of the feedback module and the first end of the energy storage module, the second end of the energy storage module is connected with the third end of the voltage division module and the negative electrode of the input power supply, and a connection point among the third end of the switch module, the second end of the feedback module and the first end of the energy storage module is a first connection point;
the switch module is used for switching on and off states based on the voltages at the two ends of the feedback module so as to control the connection state between the anode of the input power supply and the first connection point, wherein the voltage at the first end of the feedback module is the divided voltage of the voltage dividing module on the input power supply, and the voltage at the second end is the voltage on the first connection point.
2. The low dropout regulator according to claim 1,
the voltage division module comprises a first resistor and a second resistor which are connected in series;
the non-series end of the first resistor is connected with the anode of the input power supply, the connecting point between the first resistor and the second resistor is connected with the second end of the switch module, and the non-series end of the second resistor is connected with the cathode of the input power supply.
3. The low dropout regulator according to claim 2,
the voltage division module also comprises a voltage stabilizing diode;
and the anode of the voltage stabilizing diode is connected with the cathode of the input power supply, and the cathode of the voltage stabilizing diode is connected with the non-series end of the second resistor.
4. The low dropout regulator according to claim 1,
the switch module comprises a first switch tube;
the control end of the first switch tube is connected with the second end of the voltage division module, the first end of the first switch tube is connected with the first connecting point, and the second end of the first switch tube is connected with the positive electrode of the input power supply.
5. The low dropout regulator according to claim 4,
the switch module further comprises a third resistor and a clamping diode;
the first end of the third resistor is connected with the cathode of the clamping diode and the control end of the first switch tube, the second end of the third resistor is connected with the second end of the voltage division module, and the anode of the clamping diode is connected with the first connection point.
6. The low dropout regulator according to claim 1,
the feedback module comprises a fourth resistor and a first capacitor which are connected in parallel;
the first end of the circuit after the fourth resistor and the first capacitor are connected in parallel is connected with the second end of the voltage division module and the second end of the switch module, and the second end of the circuit after the fourth resistor and the first capacitor are connected in parallel is connected with the first connecting point.
7. The low dropout regulator according to claim 1,
the energy storage module comprises a second capacitor;
and two ends of the second capacitor are respectively connected with the first connecting point and the negative electrode of the input power supply.
8. The low dropout linear regulator according to any one of claims 1 to 7,
the low dropout regulator further comprises a current limiting module;
the current limiting module is used for limiting current input into the first end of the switch module.
9. The low dropout regulator according to claim 8,
the current limiting module comprises a fifth resistor and a first diode;
the first end of the fifth resistor is connected with the anode of the input power supply, the second end of the fifth resistor is connected with the anode of the first diode, and the cathode of the first diode is connected with the first end of the switch module.
10. The low dropout regulator according to claim 1,
the low dropout regulator further comprises a third capacitor;
and two ends of the third capacitor are respectively connected with the anode of the input power supply and the cathode of the input power supply.
11. A power supply apparatus comprising a low dropout linear regulator according to any one of claims 1 to 10.
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| CN202110418958.2A CN113157037A (en) | 2021-04-19 | 2021-04-19 | Low dropout regulator and power supply equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114035637A (en) * | 2021-11-16 | 2022-02-11 | 中国电子科技集团公司第二十四研究所 | Starting power supply circuit, power supply method of starting power supply circuit and starting power supply device |
-
2021
- 2021-04-19 CN CN202110418958.2A patent/CN113157037A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114035637A (en) * | 2021-11-16 | 2022-02-11 | 中国电子科技集团公司第二十四研究所 | Starting power supply circuit, power supply method of starting power supply circuit and starting power supply device |
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