CN215682124U - Two-stage series voltage stabilizing circuit with current-limiting output - Google Patents
Two-stage series voltage stabilizing circuit with current-limiting output Download PDFInfo
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- CN215682124U CN215682124U CN202121761803.0U CN202121761803U CN215682124U CN 215682124 U CN215682124 U CN 215682124U CN 202121761803 U CN202121761803 U CN 202121761803U CN 215682124 U CN215682124 U CN 215682124U
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Abstract
The utility model relates to a two-stage series voltage stabilizing circuit with current-limiting output, which comprises triodes V1 and V2, resistors R1-R5, capacitors C1-C5, and adjustable output three-terminal regulators V3 and V4. The utility model adopts double adjusting tubes and adds an output current-limiting protection circuit. The input voltage range of the novel voltage stabilizing circuit can be enlarged by adopting the double adjusting tubes, and the output current limiting protection circuit can limit the current flowing through the adjusting tubes when the output end is abnormally over-current, so that the condition of over-current damage is prevented.
Description
Technical Field
The utility model relates to a design technology of a voltage stabilizing circuit, in particular to a two-stage series voltage stabilizing circuit with current-limiting output.
Background
The structure of the prior series voltage stabilizing circuit generally adopts a single regulating tube, the input voltage range is determined by the parameters of the single regulating tube, and the input range is small. The possible short circuit or overcurrent condition that appears at the output will cause the damage to the adjusting pipe, influences circuit reliability.
The working principle is as follows: as shown in FIG. 1, a simple series regulated power supply is provided, voltage is input from Vin, V1 is a regulating tube, D1 is a reference voltage regulating tube, and R1 is a current limiting resistor. The voltage of the base of V1 is fixed at U by D1D1V1 transmitting node voltage is UBESo that the output voltage Vout is equal to UD1-UBE(UD1For the voltage regulator tube operating voltage, UBEThe emitter junction voltage is the emitter junction voltage when the V1 works, and the emitter junction voltage are stable values, so that the purpose of outputting stable voltage is achieved).
The key of the circuit for stabilizing the voltage is that the adjusting tube V1 is in an amplifying region, and the voltage drop between Vin and Vout is borne by V1. When the output end of the circuit is abnormally over-current, the adjusting tube is easy to be damaged because of no current limitation, and the reliability is poor.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is: the application range and the reliability of the voltage stabilizing circuit are improved.
The technical scheme of the utility model is as follows: double regulation triodes (V1 and V2) are adopted, and an output current limiting protection circuit is added. The input voltage range of the novel voltage stabilizing circuit can be enlarged by adopting the double adjusting tubes, and the output current limiting protection circuit can limit the current flowing through the adjusting tubes when the output end is abnormally over-current, so that the condition of over-current damage is prevented.
The two-stage series voltage stabilizing circuit with current-limiting output is provided and comprises triodes V1 and V2, resistors R1-R5, capacitors C1-C5, and adjustable output three-terminal voltage regulators V3 and V4;
one end of the resistor R1, one end of the capacitor C1 and the collector of the triode V1 are communicated and used as the input Vin of the voltage stabilizing circuit;
an emitting electrode of the triode V1, a collecting electrode of the triode V2, one end of the capacitor C2 and one end of the capacitor C3 are simultaneously communicated;
the other end of the resistor R1, the other end of the capacitor C1, the other end of the capacitor C2, one end of the resistor R2 and the base electrode of the triode V1 are simultaneously communicated;
the other end of the resistor R2, the other end of the capacitor C3, the other end of the capacitor C4, the base electrode of the triode V2 and the cathode of the adjustable output three-terminal voltage regulator V3 are simultaneously communicated;
one end of the capacitor C4, an emitter of the triode V2, one end of the resistor R3 and a ref end of the adjustable output three-terminal regulator V3 are communicated at the same time;
the anode of the adjustable output three-terminal regulator V3, the other end of the resistor R3, the cathode of the adjustable output three-terminal regulator V4, one end of the resistor R4 and one end of the capacitor C5 are simultaneously communicated and used as the output Vout of the voltage stabilizing circuit;
the other end of the resistor R4, one end of the resistor R5 and the ref end of the adjustable output three-terminal regulator V4 are communicated at the same time;
the other end of the capacitor C5, the other end of the resistor R5 and the anode of the adjustable output three-terminal regulator V4 are all grounded.
Further, the resistor R4 is an adjustable resistor.
Furthermore, the capacitance values of the capacitors C1-C4 are 103K or 104K.
Further, the transistors V1 and V2 are NPN transistors.
Further, the resistance ratio of the resistors R1 and R2 is 1: 2, so that V1 and V2 are in a power-sharing state.
Further, the adjustable output three-terminal voltage regulators V3 and V4 are in models of TL431 or TLV 431.
The working principle of the utility model is as follows:
the voltage is input from Vin and is subjected to voltage reduction adjustment through the triodes V1 and V2 in an amplifying state to become the voltage which can be normally operated by a subsequent circuit, the voltage drop of the input voltage and the output voltage is shared by V1 and V2, and compared with a single regulating tube, the range of the voltage of the input end of the circuit is enlarged.
The C1-C4 are used for absorbing power peaks and improving the working reliability of V1 and V2. V3 is three-terminal adjustable regulator, and V3 cooperates R3 to constitute the type of inhaling current-limiting circuit, and the current limiting value is I ═ Vref/R3(Vref is internal reference power supply, has two kinds of common amplitude optional of 1.25V, 2.5V), and this current-limiting circuit limits the electric current that flows through adjusting tube V1, V2, makes V1, V2 power consumption not exceed the safe range, reduces the damage that output end abnormal overcurrent brought V1, V2.
V4 is also a three-terminal adjustable regulator, and is matched with R4 and R5 to adjust the output voltage, the output value is Vout ═ (1+ R4/R5) Vref (Vref is an internal reference power supply, two common amplitudes of 1.25V and 2.5V are selectable), and R4 is an adjustable resistor, which facilitates the setting of the output voltage. Through the circuits of the parts, the function of the two-stage series voltage stabilizing circuit with current limiting output is realized.
The utility model has the advantages that: the circuit has wider input voltage range, has the function of output current limiting, can conveniently adjust the output voltage range, and improves the reliability and the application range of the circuit.
Drawings
FIG. 1 is a schematic diagram of a present day series voltage regulator circuit;
fig. 2 is a circuit schematic of the present invention.
Detailed Description
The present invention is described in further detail below. Referring to fig. 2, a two-stage series voltage stabilizing circuit with current-limiting output includes a voltage input circuit 1, a current-limiting circuit 2, and a voltage-stabilizing value adjusting circuit 3;
the input circuit 1 comprises a resistor R1, a resistor R2, a capacitor C1 to a capacitor C4, a triode V1 and a triode V2; r1, R2 are connected in series, play the role of current limiting in the circuit: one end of the R1 is communicated with the circuit input Vin and the collector of the triode V1, the other end is communicated with the base of the triode V1, the front end of the R2 is communicated with the base of the triode V1, and the other end is communicated with the base of the triode V2; one end of each of the C1 and the C2 is respectively communicated with a collector and an emitter of the triode V1, and the other end of each of the C1 and the C2 is communicated with a base of the V1; one end of each of the C3 and the C4 is respectively communicated with a collector and an emitter of the triode V2, and the other end of each of the C3 and the C4 is communicated with a base of the V2;
the output current limiting circuit 2 comprises a three-terminal adjustable voltage reference V3 and a resistor R3; a cathode (cathode) of the three-end adjustable voltage reference V3 is communicated with a base electrode of the triode V2, an Anode (Anode) is communicated with a cathode of the V4, and a REF end is communicated with the upper end of the resistor R3; the lower end of the R3 is communicated with one end of the R4;
the adjusting circuit 3 comprises a three-terminal adjustable voltage reference V4, resistors R4 and R5 and a capacitor C5; the cathode (cathode) of the three-terminal adjustable voltage reference V4 is communicated with the Anode of V3 and is used as the output of the series voltage stabilizing circuit, the Anode (Anode) is communicated with the lower end of a resistor R5 and the lower end of a capacitor C5 and is used as the Ground (GND) of the whole series voltage stabilizing circuit, the R4 is connected with the R5 in series, and the communication point of the R4 and the REF end of V4 are communicated; the upper end of the resistor R4 is communicated with the left end of the capacitor C5.
The input circuit 1 comprises two triodes V1 and V2, an emitter of V1 is communicated with a collector of V2, and the two triodes are connected in series; the output current limiting circuit 2 and the voltage stabilizing circuit 3 respectively comprise three-end adjustable voltage references V3 and V4, and the cathode of V4 is communicated with the anode of V3.
The resistor R4 is an adjustable resistor.
The capacitance values of the capacitors C1-C4 are 103K or 104K.
The transistors V1 and V2 are NPN transistors.
The resistance ratio of the resistors R1 and R2 is 1: 2, so that V1 and V2 are in a power-sharing state.
The adjustable output three-terminal voltage regulators V3 and V4 are TL431 in model number.
Claims (6)
1. Two-stage series voltage stabilizing circuit with current-limiting output is characterized in that: the power supply comprises triodes V1 and V2, resistors R1-R5, capacitors C1-C5, and adjustable output three-terminal voltage regulators V3 and V4;
one end of the resistor R1, one end of the capacitor C1 and the collector of the triode V1 are communicated and used as the input Vin of the voltage stabilizing circuit;
an emitting electrode of the triode V1, a collecting electrode of the triode V2, one end of the capacitor C2 and one end of the capacitor C3 are simultaneously communicated;
the other end of the resistor R1, the other end of the capacitor C1, the other end of the capacitor C2, one end of the resistor R2 and the base electrode of the triode V1 are simultaneously communicated;
the other end of the resistor R2, the other end of the capacitor C3, the other end of the capacitor C4, the base electrode of the triode V2 and the cathode of the adjustable output three-terminal voltage regulator V3 are simultaneously communicated;
one end of the capacitor C4, an emitter of the triode V2, one end of the resistor R3 and a ref end of the adjustable output three-terminal regulator V3 are communicated at the same time;
the anode of the adjustable output three-terminal regulator V3, the other end of the resistor R3, the cathode of the adjustable output three-terminal regulator V4, one end of the resistor R4 and one end of the capacitor C5 are simultaneously communicated and used as the output Vout of the voltage stabilizing circuit;
the other end of the resistor R4, one end of the resistor R5 and the ref end of the adjustable output three-terminal regulator V4 are communicated at the same time;
the other end of the capacitor C5, the other end of the resistor R5 and the anode of the adjustable output three-terminal regulator V4 are all grounded.
2. The two-stage series voltage regulator circuit with current limited output of claim 1, wherein: the resistor R4 is an adjustable resistor.
3. The two-stage series voltage regulator circuit with current limited output of claim 1, wherein: the capacitance values of the capacitors C1-C4 are 103K or 104K.
4. The two-stage series voltage regulator circuit with current limited output of claim 1, wherein: the transistors V1 and V2 are NPN transistors.
5. The two-stage series voltage regulator circuit with current limited output of claim 1, wherein: the resistance ratio of the resistors R1 and R2 is 1: 2.
6. the two-stage series voltage regulator circuit with current limited output of claim 1, wherein: the adjustable output three-terminal voltage regulators V3 and V4 are in models of TL431 or TLV 431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121761803.0U CN215682124U (en) | 2021-07-30 | 2021-07-30 | Two-stage series voltage stabilizing circuit with current-limiting output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121761803.0U CN215682124U (en) | 2021-07-30 | 2021-07-30 | Two-stage series voltage stabilizing circuit with current-limiting output |
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| Publication Number | Publication Date |
|---|---|
| CN215682124U true CN215682124U (en) | 2022-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121761803.0U Active CN215682124U (en) | 2021-07-30 | 2021-07-30 | Two-stage series voltage stabilizing circuit with current-limiting output |
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| CN (1) | CN215682124U (en) |
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2021
- 2021-07-30 CN CN202121761803.0U patent/CN215682124U/en active Active
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