CN212543652U - Simple voltage-stabilizing power supply circuit with under-voltage protection - Google Patents
Simple voltage-stabilizing power supply circuit with under-voltage protection Download PDFInfo
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Abstract
The utility model relates to a voltage-stabilizing power supply circuit of undervoltage protection simply takes. The device comprises an NMOS tube Q1, a triode Q2, voltage-stabilizing diodes Z1 and Z2, capacitors C1, C2 and C3 and resistors R1-R4; one end of R1 is connected with positive electrode VBAT + of lithium battery, the other end of R1 is connected with the drain of Q1, the emitter of Q2, one end of R3 and one end of C1, the source of Q1 is connected with output Vcc and one end of C2, the grid of Q1 is connected with one end of R2, the cathode of Z1 and one end of C3, the collector of Q2 is connected with the other end of R2, the base of Q2 is connected with the other end of R3 and one end of R4, the other end of R4 is connected with the cathode of Z2, the positive electrode of Z1, the positive electrode of Z2 and the other end of C3 are connected with ground, and the other ends of C1 and C2 are respectively connected with ground. The utility model discloses the circuit scheme device is simple, and low cost has the low-power consumption characteristic.
Description
Technical Field
The utility model relates to an electronic product application field with lithium cell power supply, concretely relates to voltage stabilizing power supply circuit of simply taking undervoltage protection.
Background
In the application of lithium cell, the constant voltage power supply circuit of undervoltage protection is taken in the design, gives other circuit powers, discharges when very low-voltage when the lithium cell needs to turn off, reduces other circuit consumptions, and the safety of protection lithium cell under the undervoltage because the lithium cell is unstable under the undervoltage, easily goes out the safety problem.
The existing voltage-stabilizing power supply with the under-voltage protection is mainly composed of a voltage comparator circuit (such as S80930) and a voltage reduction circuit and a low-voltage linear (or switch) voltage-stabilizing power supply which are needed in a plurality of strings of lithium batteries, and the scheme is complex, so that the cost is increased.
Disclosure of Invention
An object of the utility model is to provide a voltage stabilizing power supply circuit of simply taking undervoltage protection, this circuit scheme device is simple, and low cost has the low-power consumption characteristic.
In order to achieve the above purpose, the technical scheme of the utility model is that: a simple voltage-stabilized power supply circuit with under-voltage protection comprises an NMOS (N-channel metal oxide semiconductor) tube Q1, a triode Q2, voltage-stabilized diodes Z1 and Z2, capacitors C1, C2 and C3 and resistors R1-R4; one end of R1 is connected with positive electrode VBAT + of lithium battery, the other end of R1 is connected with the drain of Q1, the emitter of Q2, one end of R3 and one end of C1, the source of Q1 is connected with output Vcc and one end of C2, the grid of Q1 is connected with one end of R2, the cathode of Z1 and one end of C3, the collector of Q2 is connected with the other end of R2, the base of Q2 is connected with the other end of R3 and one end of R4, the other end of R4 is connected with the cathode of Z2, the positive electrode of Z1, the positive electrode of Z2 and the other end of C3 are connected with ground, and the other ends of C1 and C2 are respectively connected with ground.
In an embodiment of the present invention, in the circuit, R1 and C1 form an input RC filter circuit for filtering; q2, Z2 and R4 form comparison, amplification and power off under undervoltage; r2 is a current-limiting resistor of Z1, so that Z1 works in a reverse conduction voltage stabilization state, and when VBAT + > Z2 has a voltage stabilization value of +0.5V, the triode Q1 works in an amplification state; the C3 and C2 play a role in output filtering.
In an embodiment of the present invention, the transistor Q2 is a PNP transistor.
In an embodiment of the present invention, the zener diode Z1 can be replaced by other zener devices.
In an embodiment of the present invention, the NMOS transistor Q1 may be replaced by an NPN transistor.
In an embodiment of the present invention, the NMOS transistor Q1 may be replaced by another current expansion device.
Compared with the prior art, the utility model discloses following beneficial effect has: the circuit of the utility model adopts the cut-off and amplification saturation state of the PNP triode to realize the under-voltage protection action, and utilizes the voltage-stabilizing characteristic of the voltage-stabilizing diode and MOS (N) current expansion to complete the function of the linear voltage-stabilizing power supply; the utility model discloses the circuit composition is simple, and it is simple according to the modification of actual scene, the low-power consumption, the cost is very low, has good practicality and economic nature.
Drawings
Fig. 1 is a schematic circuit diagram according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of another embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be specifically described below with reference to the accompanying drawings.
The utility model provides a simple voltage-stabilizing power supply circuit with under-voltage protection, which comprises an NMOS tube Q1, a triode Q2, voltage-stabilizing diodes Z1 and Z2, capacitors C1, C2, C3 and resistors R1-R4; one end of R1 is connected with positive electrode VBAT + of lithium battery, the other end of R1 is connected with the drain of Q1, the emitter of Q2, one end of R3 and one end of C1, the source of Q1 is connected with output Vcc and one end of C2, the grid of Q1 is connected with one end of R2, the cathode of Z1 and one end of C3, the collector of Q2 is connected with the other end of R2, the base of Q2 is connected with the other end of R3 and one end of R4, the other end of R4 is connected with the cathode of Z2, the positive electrode of Z1, the positive electrode of Z2 and the other end of C3 are connected with ground, and the other ends of C1 and C2 are respectively connected with ground.
The following is a specific example of the present invention.
Example one: as shown in FIG. 1, the utility model relates to a voltage-stabilized power supply circuit of simple and easy under-voltage protection of taking, including NMOS pipe Q1, triode Q2, stabilivolt Z1/Z2, electric capacity C1/C2/C3 and resistance R1~ R4. Wherein R1 and C1 form an input RC filter circuit for filtering; q2, Z2 and R4 form comparison, amplification and power off under undervoltage; r2 is a current-limiting resistor of Z1, so that Z1 works in a reverse conduction voltage stabilization state, and Q1 works in an amplification state when VBAT + > Z2 has a voltage stabilization value of + 0.5V; the C3 and C2 play a role in output filtering.
The connection relationship of the circuit is as follows: VBAT + is connected to the d pole of Q1 through R1, and the output Vcc is connected to the s pole of Q1; VBAT + is connected to the e pole of Q2 through R1, the c pole of Q2 is connected to the negative pole of Z1 through R2, and the negative pole of Z1 is connected to the g pole of Q1; the b pole of Q2 is connected to the negative pole of Z2 through R4; one end of C3 is grounded, and the other end is connected with the negative pole of Z1; c2 has one end connected to ground and the other end connected to the s pole of Q1.
The working process of the circuit is as follows: when VBAT + is larger than UZ2At +0.5V, current flows through the base of Q2, Q2 is made to operate in an amplified or saturated state, and a voltage is applied to Z1; z1 is in reverse conduction and regulated voltage value UZ1(ii) a G pole of Q1 is connected to voltage UZ1Q1 is in amplification state and outputs VCC with value of UZ1-1.5V (different Q1 models will be different), linear steady state. When VBAT + is less than UZ2When Q2 is in a cut-off state, Z1 is cut off, so that Q1 is cut off, the output VCC is 0V, under-voltage is cut off, the under-voltage protection state is realized, and the under-voltage detection precision is +/-0.5V.
Example two: as shown in FIG. 2, the utility model relates to a simple voltage-stabilized power supply circuit with under-voltage protection, which comprises a triode Q1/Q2, a voltage-stabilized tube Z1/Z2, a capacitor C1/C2/C3 and resistors R1-R4. Wherein R1 and C1 form an input RC filter circuit for filtering; q2, Z2 and R4 form comparison, amplification and power off under undervoltage; r2 is a current-limiting resistor of Z1, so that Z1 works in a reverse conduction voltage stabilization state, and when VBAT + > Z2 has a voltage stabilization value of +0.5V, the triode Q1 works in an amplification state; the C3 and C2 play a role in output filtering.
The working principle of the second example is the same as that of the first example, and only the Q1 is replaced by a triode.
Above is the utility model discloses a preferred embodiment, all rely on the utility model discloses the change that technical scheme made, produced functional action does not surpass the utility model discloses during technical scheme's scope, all belong to the utility model discloses a protection scope.
Claims (6)
1. A simple voltage-stabilized power supply circuit with under-voltage protection is characterized by comprising an NMOS (N-channel metal oxide semiconductor) tube Q1, a triode Q2, voltage-stabilizing diodes Z1 and Z2, capacitors C1, C2 and C3 and resistors R1-R4; one end of R1 is connected with positive electrode VBAT + of lithium battery, the other end of R1 is connected with the drain of Q1, the emitter of Q2, one end of R3 and one end of C1, the source of Q1 is connected with output Vcc and one end of C2, the grid of Q1 is connected with one end of R2, the cathode of Z1 and one end of C3, the collector of Q2 is connected with the other end of R2, the base of Q2 is connected with the other end of R3 and one end of R4, the other end of R4 is connected with the cathode of Z2, the positive electrode of Z1, the positive electrode of Z2 and the other end of C3 are connected with ground, and the other ends of C1 and C2 are respectively connected with ground.
2. A simple regulated power supply circuit with under-voltage protection according to claim 1, wherein R1 and C1 form an input RC filter circuit for filtering; q2, Z2 and R4 form comparison, amplification and power off under undervoltage; r2 is a current-limiting resistor of Z1, so that Z1 works in a reverse conduction voltage stabilization state, and when VBAT + > Z2 has a voltage stabilization value of +0.5V, the triode Q1 works in an amplification state; the C3 and C2 play a role in output filtering.
3. The regulated power supply circuit according to claim 1, wherein said transistor Q2 is a PNP transistor.
4. The simple regulated power supply circuit with under-voltage protection according to claim 1, wherein said zener diode Z1 can be replaced by other zener devices.
5. The simple regulated power supply circuit with under-voltage protection according to claim 1, wherein said NMOS transistor Q1 is replaced by an NPN transistor.
6. The simple regulated power supply circuit with under-voltage protection according to claim 1, wherein said NMOS transistor Q1 can be replaced by other current-expanding devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021142564.6U CN212543652U (en) | 2020-06-19 | 2020-06-19 | Simple voltage-stabilizing power supply circuit with under-voltage protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021142564.6U CN212543652U (en) | 2020-06-19 | 2020-06-19 | Simple voltage-stabilizing power supply circuit with under-voltage protection |
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| CN212543652U true CN212543652U (en) | 2021-02-12 |
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| CN202021142564.6U Active CN212543652U (en) | 2020-06-19 | 2020-06-19 | Simple voltage-stabilizing power supply circuit with under-voltage protection |
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