CN218041210U - DC-DC voltage stabilizing circuit - Google Patents
DC-DC voltage stabilizing circuit Download PDFInfo
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- CN218041210U CN218041210U CN202221777615.1U CN202221777615U CN218041210U CN 218041210 U CN218041210 U CN 218041210U CN 202221777615 U CN202221777615 U CN 202221777615U CN 218041210 U CN218041210 U CN 218041210U
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Abstract
The utility model provides a DC-DC voltage stabilizing circuit, include: the power supply comprises two field effect transistors Q1 and Q2 and three resistors R2-R4, wherein the resistor R2 provides driving voltage for a grid electrode of the field effect transistor Q1, two ends of the resistor R2 are respectively connected with the grid electrode and a drain electrode of the field effect transistor Q1, and a source electrode of the field effect transistor Q1 is connected with the anode of an output power supply; the resistor R3 and the resistor R4 are feedback resistors and provide driving voltage for a grid electrode of the field effect transistor Q2, one end of the resistor R3 is connected with the resistor R4, the other end of the resistor R3 is connected with the anode of an output power supply, the other end of the resistor R4 outputs the cathode of the power supply, and the cathode of the output power supply is grounded; the field effect transistor Q2 is used for controlling the conduction state of the field effect transistor Q1, the drain electrode of the field effect transistor Q2 is connected with the grid electrode of the field effect transistor Q1, the source electrode of the field effect transistor Q1 is connected with the negative electrode of the output power supply, and the grid electrode of the field effect transistor Q2 is connected between the resistor R3 and the resistor R4. The utility model provides a DC-DC voltage stabilizing circuit simple structure easily designs the realization, only comprises discrete component, and is with low costs.
Description
Technical Field
The utility model relates to an electronic circuit technical field, concretely relates to DC-DC voltage stabilizing circuit.
Background
The product by battery power supply, because the battery can differ great at the voltage meeting under the full charge of electric quantity and the empty state, the inside core Integrated Circuit of product then needs comparatively stable voltage just can normally work, consequently all can have a steady voltage's power supply Circuit to supply power for the core chip when the design, and most designers can adopt voltage regulation Integrated Circuit (IC) chip to supply power, for example: when a DC-DC voltage reduction type or three-terminal voltage stabilizer is adopted by a power stabilizing circuit used by the conventional lithium battery product, the IC chip is large in size, occupies a PCB space in design, correspondingly increases the design difficulty of a product with space limitation on the PCB, consumes the electric quantity of a battery all the time when the integrated chip operates for a long time, and increases the cost of the product with large quantity.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a DC-DC voltage stabilizing circuit solves current voltage stabilizing circuit design complicacy, problem that manufacturing cost is high.
The embodiment of the utility model provides a DC-DC voltage stabilizing circuit, include: two field effect transistors Q1 and Q2, three resistors R2-R4, wherein,
the resistor R2 provides driving voltage for the grid electrode of the field effect transistor Q1, two ends of the resistor R are respectively connected with the grid electrode and the drain electrode of the field effect transistor Q1, and the source electrode of the field effect transistor Q1 is connected with the anode of the output power supply;
the resistor R3 and the resistor R4 are feedback resistors and provide driving voltage for a grid electrode of the field effect transistor Q2, one end of the resistor R3 is connected with the resistor R4, the other end of the resistor R3 is connected with the anode of an output power supply, one end of the resistor R4 is connected with the R3, the other end of the resistor R4 is connected with the cathode of the output power supply, and the cathode of the output power supply is grounded;
the field effect transistor Q2 is used for controlling the conduction state of the field effect transistor Q1, the drain electrode of the field effect transistor Q2 is connected with the grid electrode of the field effect transistor Q1, the source electrode of the field effect transistor Q1 is connected with the negative electrode of the output power supply, and the grid electrode of the field effect transistor Q2 is connected between the resistor R3 and the resistor R4.
Optionally, the DC-DC voltage stabilizing circuit further includes:
and the current limiting resistor R1 is used for limiting the instantaneous current when the input power supply circuit is electrified, one end of the current limiting resistor R1 is connected with the anode of the input power supply, and the other end of the current limiting resistor R1 is connected with the drain electrode of the field effect transistor Q1.
Optionally, the DC-DC voltage stabilizing circuit further includes:
and the inductor L1 is used for limiting the instantaneous current when the input power supply circuit is electrified, one end of the inductor L1 is connected with the anode of the input power supply, and the other end of the inductor L is connected with the drain electrode of the field effect transistor Q1.
The current-limiting resistor R1 or the inductor L1 is connected to the positive electrode of the input power supply, so that the instant current of the input power supply circuit is limited, and the problem that elements in the circuit are damaged due to the excessive instant current is avoided.
Optionally, the DC-DC voltage stabilizing circuit further includes:
the filter capacitor C1, the resistor R3 and the resistor R4 are connected in series and then connected in parallel with the capacitor C1, the positive electrode of the capacitor C1 is connected with the positive electrode of the output power supply, and the negative electrode of the capacitor C1 is connected with the negative electrode of the output power supply.
The filter capacitor C1 is connected with two ends of the output power supply, and filters voltage fluctuation in the circuit, so that the output power supply is more stable.
Optionally, the field effect transistor Q1 and the field effect transistor Q2 are both N-channel field effect transistors.
The utility model provides a DC-DC voltage stabilizing circuit, based on several discrete component constitution, utilized field effect transistor grid insulation characteristic and voltage control to switch on and the characteristic of cutting off and realize DC-DC voltage stabilization, simple structure, to the product that PCB has space restriction, still can satisfy voltage stabilizing circuit's requirement in the small space, easily realize; the voltage stabilizing circuit uses the resistor to adjust the voltage, and the voltage drive controls the on-off of the field effect transistor, so the static power consumption of the voltage stabilizing circuit is smaller, a product produced by the voltage stabilizing circuit can be stored for a long time, and the energy is saved; meanwhile, compared with a voltage stabilizing chip, the discrete component is low in price, hardware cost is saved, and the voltage stabilizing chip has good practicability and economy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following descriptions are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a DC-DC voltage stabilizing circuit provided in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another embodiment of a DC-DC voltage regulator circuit according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a DC-DC voltage regulator circuit according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a specific embodiment of a DC-DC voltage stabilizing circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
An embodiment of the utility model provides a DC-DC voltage stabilizing circuit, as shown in FIG. 1, include: two field effect transistors Q1 and Q2, three resistors R2-R4, wherein,
the resistor R2 provides driving voltage for the grid electrode of the field effect transistor Q1, two ends of the resistor R are respectively connected with the grid electrode and the drain electrode of the field effect transistor Q1, and the source electrode of the field effect transistor Q1 is connected with the anode of the output power supply. Illustratively, when the input power supply is connected to the circuit, the voltage of the positive electrode of the input power supply is applied to the grid electrode of the field effect tube Q1 through the R2, the field effect tube Q1 is driven to be conducted, and the source electrode of the field effect tube Q1 outputs the voltage to the positive electrode of the output power supply.
The resistor R3 and the resistor R4 are feedback resistors and provide driving voltage for a grid electrode of the field effect transistor Q2, one end of the resistor R3 is connected with the resistor R4, the other end of the resistor R3 is connected with the anode of an output power supply, one end of the resistor R4 is connected with the resistor R3, the cathode of the output power supply is arranged at the other end of the resistor R4, and the cathode of the output power supply is grounded. Illustratively, when the input power supply is not connected into the circuit, the output power supply of the circuit is 0V, the grid voltage of the field-effect tube Q2 is also 0V, and the field-effect tube Q2 is in a turn-off cut-off state; when the voltage of the output power supply rises to enable the divided voltage of the resistor R3 and the resistor R4 to reach the grid opening voltage of the field effect transistor Q2, the drain electrode of the field effect transistor Q2 is changed from the cut-off state to the conducting state.
The field effect transistor Q2 is used for controlling the conduction state of the field effect transistor Q1, the drain electrode of the field effect transistor Q2 is connected with the grid electrode of the field effect transistor Q1, the source electrode of the field effect transistor Q1 is connected with the negative electrode of the output power supply, and the grid electrode of the field effect transistor Q2 is connected between the resistor R3 and the resistor R4. Illustratively, the gate of the fet Q1 is turned on by the fet Q2When the voltage drops, the conduction degree of the field effect transistor Q1 is weakened, the current flowing between the drain electrode and the source electrode of the field effect transistor Q1 is reduced, and when the output voltage reaches the stable voltage V O The output voltage will be in a stable state, wherein:
V G2 is the gate turn-on voltage of fet Q2. At this time, if the output voltage is larger than V O The grid voltage of the field effect transistor Q2 can be increased, the conduction degree of the field effect transistor Q2 is enhanced, the grid voltage of the field effect transistor Q1 is reduced, the field effect transistor Q1 is changed to a state tending to be cut off, and the output voltage can be reduced; if the output voltage is less than V O The grid voltage of the field effect transistor Q2 is small, so that the field effect transistor Q2 is enabled to be converted towards a cut-off state, the grid voltage of the field effect transistor Q1 is increased, the conduction degree of the field effect transistor Q1 is enhanced, and the output voltage is increased; therefore, the output voltage of the power supply circuit can be automatically adjusted according to the feedback circuit formed by the resistor R3, the resistor R4 and the field effect transistor Q2, and the output voltage value is stabilized at the stable voltage V O In the vicinity, the output voltage of the entire power supply circuit is in a steady state. The fet Q2 in this embodiment may be a transistor with a switching function, but is not limited thereto.
The embodiment of the utility model provides a DC-DC voltage stabilizing circuit, based on several discrete component are constituteed, utilized field effect transistor grid insulating property and voltage control to switch on and the characteristic of end and realize DC-DC voltage stabilization, simple structure, to the product that PCB has space restriction, still can satisfy voltage stabilizing circuit's requirement in the small space, easily realize; meanwhile, compared with a voltage stabilizing chip, the price of discrete components is low, and the hardware cost is saved.
In another embodiment, as shown in FIG. 2, the DC-DC voltage regulator circuit further comprises:
and the current limiting resistor R1 is used for limiting the instantaneous current when the input power supply circuit is electrified, one end of the current limiting resistor R1 is connected with the anode of the input power supply, and the other end of the current limiting resistor R1 is connected with the drain electrode of the field effect transistor Q1. Illustratively, at the moment of inputting the power supply into the circuit, the positive voltage of the input power supply enters the circuit again through the resistor R1, and the resistor R1 is used as a current-limiting resistor to limit the current of the input power supply at the moment of accessing, so that the problem that the electronic elements in the circuit are damaged by the excessive current is avoided, and the stability of the circuit is ensured.
In another embodiment, the resistor R1 may be replaced by an inductor L1 for limiting the instantaneous current when the input power circuit is powered on, and one end of the inductor L1 is connected to the positive electrode of the input power circuit, and the other end of the inductor L is connected to the drain of the field-effect transistor Q1. The problem that the electronic elements are damaged due to overlarge current in the circuit at the moment of connecting the input power supply to the circuit can be avoided.
In another embodiment, based on fig. 1 and/or fig. 2, as shown in fig. 3, the DC-DC voltage stabilizing circuit further includes:
the filter capacitor C1, the resistor R3 and the resistor R4 are connected in series and then connected with the capacitor C1 in parallel, the positive electrode of the capacitor C1 is connected with the positive electrode of the output power supply, and the negative electrode of the capacitor C1 is connected with the negative electrode of the output power supply. Illustratively, the input power supplies charge the capacitor C1 through the R1 and the conducting field effect transistor Q1, the voltage at two ends of the capacitor C1 gradually rises, and when the voltage in the circuit fluctuates and is lower than the voltage at two ends of the capacitor C1, the capacitor C1 discharges, so that the voltage value of the output power supplies output through the capacitor C1 is more stable. The filter capacitor C1 is connected with two ends of the output power supply, so that voltage fluctuation in the circuit is filtered out, and the output power supply is more stable.
Specifically, in one embodiment, the field effect transistor Q1 and the field effect transistor Q2 are both N-channel field effect transistors.
FIG. 4 shows a practical circuit with specific parameters, according to the handbook of 2N7002, the gate turn-on voltage of the FET Q2 is 1.25V, so that the circuit outputs the voltage of the power source
The voltage of the output power supply of the circuit can be stabilized between 4.8V and 5.5V through actual measurement, in practical application, the grid opening voltage of the field effect transistor Q2 has possibility of error, and the voltage of the output power supply can be adjusted through adjusting the resistance value of the resistor R3 or the resistor R4。
The utility model provides a DC-DC voltage stabilizing circuit, based on several discrete component constitution, utilized field effect transistor grid insulation characteristic and voltage control to switch on and the characteristic of cutting off and realize DC-DC voltage stabilization, simple structure, to the product that PCB has space restriction, still can satisfy voltage stabilizing circuit's requirement in the small space, easily realize; the voltage stabilizing circuit uses the resistor to adjust the voltage, and the voltage drive controls the on-off of the field effect transistor, so that the static power consumption of the voltage stabilizing circuit is relatively low, products produced by the voltage stabilizing circuit can be stored for a long time, and the energy is saved; meanwhile, compared with a voltage stabilizing chip, the discrete component is low in price, hardware cost is saved, and the voltage stabilizing chip has good practicability and economy.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (5)
1. A DC-DC voltage regulator circuit, comprising: two field effect transistors Q1 and Q2, three resistors R2-R4, wherein,
the resistor R2 provides driving voltage for the grid electrode of the field effect transistor Q1, two ends of the resistor R are respectively connected with the grid electrode and the drain electrode of the field effect transistor Q1, and the source electrode of the field effect transistor Q1 is connected with the anode of the output power supply;
the resistor R3 and the resistor R4 are feedback resistors and provide driving voltage for a grid electrode of the field effect transistor Q2, one end of the resistor R3 is connected with the resistor R4, the other end of the resistor R3 is connected with the anode of an output power supply, one end of the resistor R4 is connected with the R3, the other end of the resistor R4 is connected with the cathode of the output power supply, and the cathode of the output power supply is grounded;
the field effect transistor Q2 is used for controlling the conduction state of the field effect transistor Q1, the drain electrode of the field effect transistor Q2 is connected with the grid electrode of the field effect transistor Q1, the source electrode of the field effect transistor Q1 is connected with the negative electrode of the output power supply, and the grid electrode of the field effect transistor Q2 is connected between the resistor R3 and the resistor R4.
2. The DC-DC voltage regulator circuit of claim 1, further comprising:
and the current limiting resistor R1 is used for limiting the instantaneous current when the input power supply circuit is electrified, one end of the current limiting resistor R1 is connected with the anode of the input power supply, and the other end of the current limiting resistor R1 is connected with the drain electrode of the field effect transistor Q1.
3. The DC-DC voltage regulator circuit of claim 1, further comprising:
and the inductor L1 is used for limiting the instantaneous current when the input power supply circuit is electrified, one end of the inductor L1 is connected with the anode of the input power supply, and the other end of the inductor L1 is connected with the drain electrode of the field effect transistor Q1.
4. The DC-DC voltage regulator circuit of claim 2 or 3, further comprising:
the filter capacitor C1, the resistor R3 and the resistor R4 are connected in series and then connected with the capacitor C1 in parallel, the positive electrode of the capacitor C1 is connected with the positive electrode of the output power supply, and the negative electrode of the capacitor C1 is connected with the negative electrode of the output power supply.
5. The DC-DC voltage regulator circuit of claim 1, wherein the field effect transistor Q1 and the field effect transistor Q2 are both N-channel field effect transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221777615.1U CN218041210U (en) | 2022-07-11 | 2022-07-11 | DC-DC voltage stabilizing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221777615.1U CN218041210U (en) | 2022-07-11 | 2022-07-11 | DC-DC voltage stabilizing circuit |
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| Publication Number | Publication Date |
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| CN218041210U true CN218041210U (en) | 2022-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221777615.1U Active CN218041210U (en) | 2022-07-11 | 2022-07-11 | DC-DC voltage stabilizing circuit |
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