CN207853445U - A kind of control power supply low-voltage protection circuit - Google Patents
A kind of control power supply low-voltage protection circuit Download PDFInfo
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- CN207853445U CN207853445U CN201820249509.3U CN201820249509U CN207853445U CN 207853445 U CN207853445 U CN 207853445U CN 201820249509 U CN201820249509 U CN 201820249509U CN 207853445 U CN207853445 U CN 207853445U
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Abstract
The utility model proposes a kind of control power supply low-voltage protection circuits, including voltage detecting circuit and auxiliary power circuit, it is characterised in that：Control power supply is separately input to voltage detecting circuit and auxiliary power circuit；The voltage detecting circuit is for detecting controlling power circuit voltage, and its output end is connect with the auxiliary power circuit；The auxiliary power circuit is output to the pull-up source of signal in circuit for controlling accessory power supply output.Compared with the prior art, line under-voltage protection circuit described in the utility model has the advantage that：The line under-voltage that the utility model uses protects circuit, and when control abnormity of power supply, it is out of control to be substantially prevented from circuit board signal, enhancing circuit reliability.
Description
Technical field
The utility model is related to a kind of circuit protection devices, and in particular to control power supply less voltage protector.
Background technology
Existing control power protection generally realized by under-voltage reset chip, when powering on and controlling line under-voltage to
Master control chip sends out reset signal, it is made to be stopped.This scheme is in control power supply electrifying moment, lower electricity moment and voltage
When control chip being reduced to start voltage or less, it can not ensure that the signal containing pull-up in circuit is in controllable state, it is out of control
Circuit signal will cause circuit operation irregularity even to be caused danger.
Invention content
The purpose of this utility model is to provide a kind of control line under-voltages to protect circuit, in circuit power power up,
Circuit board signal is protected when lower electric process and under-voltage, avoids its out of control.
To achieve the goals above, the utility model provides the following technical solutions：It includes voltage detecting circuit and auxiliary
Help power circuit, it is characterised in that：
Control power supply is separately input to voltage detecting circuit and auxiliary power circuit；
The voltage detecting circuit is for detecting controlling power circuit voltage, and its output end and accessory power supply electricity
Road connects；
The auxiliary power circuit is output to the pull-up source of signal in circuit for controlling accessory power supply output.
Wherein, the voltage detecting circuit is overvoltage/undervoltage reset chip.
Wherein, the voltage detecting circuit is MAX811NCP301.
Wherein, the emitter of the input terminal connection transistor Q1 of the auxiliary power circuit, the current collection of the transistor Q1
Pole connects the output end of the auxiliary power circuit；The base stage of the transistor Q1 is connected to another transistor by a resistance
Base stage, the base stage of another field-effect connect the output end of the voltage detecting circuit, the grounded collector of another field-effect.
Wherein, the collector of the transistor Q1 is also parallel-connected to the auxiliary electricity with the emitter of transistor Q2
The output end of source circuit；The base stage for being output to the transistor Q2 of the voltage detecting circuit, the current collection of the transistor Q2
Pole passes through a resistance eutral grounding.
Compared with the prior art, line under-voltage protection circuit described in the utility model has the advantage that：This practicality is new
The line under-voltage that type uses protects circuit, and when control abnormity of power supply, it is out of control to be substantially prevented from circuit board signal, and enhancing circuit can
By property.
Description of the drawings
Fig. 1 is the power supply low-voltage protection functional block diagram consistent with a certain embodiment of the utility model；
Fig. 2 is the auxiliary power circuit realization method one consistent with a certain embodiment of the utility model；
Fig. 3 is the auxiliary power circuit realization method two consistent with a certain embodiment of the utility model.
Specific implementation mode
More detailed description is done to the utility model with reference to the accompanying drawings and examples.
The utility model controls line under-voltage and protects circuit, as shown in Figure 1, by voltage detecting circuit and accessory power supply electricity
Road forms.
Voltage detecting circuit detection control supply voltage VCC, sends out when voltage is less than protection threshold values to auxiliary power circuit
Go out to export lock instruction；Voltage detecting circuit can generally pass through the realizations such as overvoltage/undervoltage reset chip, such as MAX811NCP301.
Auxiliary power circuit is powered by VCC, and when output lock instruction is not enabled on, it is (defeated externally to export accessory power supply VCP
Go out height), when output lock instruction is enabled, VCP stops power supply, is low level (exporting low)；Auxiliary power circuit can by Fig. 2,
The chip and circuit of Fig. 3 or corresponding function are realized.It is brilliant when output lock instruction is not enabled on (i.e./LOCK is high level) in Fig. 2
The Q1 actions of body pipe, VCP output levels are height；When exporting lock instruction enabled (i.e./LOCK is low level), transistor Q1 shutdowns,
VCP non-transformers, output level become low.In Fig. 3 schemes, a VCP discharge loops more than Fig. 2, output lock instruction is not enabled on (i.e.
/ LOCK is high level) when, transistor Q1 actions, transistor Q2 shutdowns, VCP output levels are height；It is enabled to export lock instruction
When (i.e./LOCK is low level), transistor Q1 shutdowns, transistor Q2 actions, VCP non-transformers, and output level is drawn rapidly
It is low.
The VCP of auxiliary power circuit output can be used as pull-up source, be applied to the circuit signal with pull-up on circuit board.
When circuit board control power supply is normal, VCP normally pulls up circuit signal, circuit board normal work；Circuit board controls abnormity of power supply
When, VCP dead electricity, for circuit signal without pull-up, state is low level.The runaway condition of circuit board signal is avoided as a result,.
While there has been shown and described that the embodiments of the present invention, it will be understood by those skilled in the art that：
Can these embodiments be carried out with a variety of variations in the case where not departing from the principles of the present invention and objective, modification, replaced
And modification, the scope of the utility model are limited by claim and its equivalent.
Claims (5)
1. a kind of control power supply low-voltage protection circuit, including voltage detecting circuit and auxiliary power circuit, it is characterised in that：
Control power supply is separately input to voltage detecting circuit and auxiliary power circuit；
The voltage detecting circuit is for detecting controlling power circuit voltage, and its output end connects with the auxiliary power circuit
It connects；
The auxiliary power circuit is output to the pull-up source of signal in circuit for controlling accessory power supply output.
2. a kind of control power supply low-voltage protection circuit as described in claim 1, it is characterised in that：The voltage detecting circuit is
Overvoltage/undervoltage reset chip.
3. a kind of control power supply low-voltage protection circuit as described in claim 1, it is characterised in that：The voltage detecting circuit is
MAX811NCP301。
4. a kind of control power supply low-voltage protection circuit as described in claim 1, it is characterised in that：The auxiliary power circuit
Input terminal connects the emitter of transistor Q1, and the collector of the transistor Q1 connects the output end of the auxiliary power circuit；
The base stage of the transistor Q1 is connected to the base stage of another transistor by a resistance, described in the base stage connection of another field-effect
The output end of voltage detecting circuit, the grounded collector of another field-effect.
5. a kind of control power supply low-voltage protection circuit as claimed in claim 4, it is characterised in that：The current collection of the transistor Q1
Pole is also parallel-connected to the output end of the auxiliary power circuit with the emitter of transistor Q2；The voltage detecting circuit
The base stage for being output to the transistor Q2, the collector of the transistor Q2 passes through a resistance eutral grounding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820249509.3U CN207853445U (en) | 2018-02-12 | 2018-02-12 | A kind of control power supply low-voltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820249509.3U CN207853445U (en) | 2018-02-12 | 2018-02-12 | A kind of control power supply low-voltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207853445U true CN207853445U (en) | 2018-09-11 |
Family
ID=63408779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820249509.3U Active CN207853445U (en) | 2018-02-12 | 2018-02-12 | A kind of control power supply low-voltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207853445U (en) |
-
2018
- 2018-02-12 CN CN201820249509.3U patent/CN207853445U/en active Active
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