CN206595889U - The power starting circuit of output short circuit protection small power consumption - Google Patents
The power starting circuit of output short circuit protection small power consumption Download PDFInfo
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- CN206595889U CN206595889U CN201720287529.5U CN201720287529U CN206595889U CN 206595889 U CN206595889 U CN 206595889U CN 201720287529 U CN201720287529 U CN 201720287529U CN 206595889 U CN206595889 U CN 206595889U
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Abstract
The utility model is related to a kind of power starting circuit of output short circuit protection small power consumption; the base stage of NPN triode is electrically connected by first resistor with power supply; start voltage to obtain, voltage stabilizing, the grounded emitter of NPN triode are provided for the base stage of NPN triode by the first voltage-regulator diode；The base stage of PNP triode is electrically connected with the colelctor electrode of NPN triode, emitter stage is electrically connected by second resistance with power supply, and voltage stabilizing is provided for the VCC pin of reverse exciting switching voltage regulator pwm chip by the second voltage-regulator diode, the colelctor electrode of PNP triode is electrically connected with the VCC pin of reverse exciting switching voltage regulator pwm chip；One end of 3rd resistor is electrically connected between the emitter stage of NPN triode and the 4th resistance, and the other end is electrically connected between the colelctor electrode of PNP triode and the second voltage-regulator diode.The utility model makes module output input electric current very little when short-circuit protection, and the skin temperature of module is very low.
Description
Technical field
The utility model is related to a kind of power starting circuit of output short circuit protection small power consumption.
Background technology
Current switch power module is directly to power to be used as start-up circuit to VCC by resistance, as shown in figure 1, the electricity
Road is powered startup by resistance R1 partial pressures to reverse exciting switching voltage regulator pwm chip IC, by transformer T1's after power initiation
Feedback winding pass through resistance R1 current limlitings, diode D1 rectifications, electric capacity C1 is filtered to power to IC, maintain IC work operation power supply,
Maintain the supply current of IC work bigger than starting current, do not feed back supply current, whole power supply can not normal work completely,
When power supply Vo+ and GND are short-circuit, feedback power supply is stopped power supply, and IC is powered by resistance R1 partial pressures again, and whole power supply can be in and open
The circulating mode of operation of the hiccup formula of dynamic-shut-off-startup, because resistance R1 electric current is not limited, the often startup of secondary source
Time is long, and the input current of whole process can be than larger, and the damage power of power supply is larger, and damaging power and being converted to heat makes
The skin temperature of whole modular power source is higher, and prolonged short circuit can make the device of power supply suffer damage, and cause the failure of power supply
Rate is raised.
Utility model content
Based on above-mentioned present situation, the purpose of this utility model is to provide a kind of power initiation electricity of output short circuit protection small power consumption
Road, concrete scheme of the present utility model is as follows to achieve the above object：
A kind of power starting circuit of output short circuit protection small power consumption, including NPN triode, PNP triode, the first voltage stabilizing
Diode, the second voltage-regulator diode, first resistor, second resistance, 3rd resistor and the 4th resistance；
The base stage of the NPN triode is electrically connected by first resistor with power supply, to obtain startup voltage, and is passed through
First voltage-regulator diode provides voltage stabilizing, the grounded emitter of the NPN triode for the base stage of the NPN triode；
The base stage of the PNP triode is electrically connected with the colelctor electrode of the NPN triode, emitter stage by second resistance with
Power supply is electrically connected, and provides voltage stabilizing by the second voltage-regulator diode for the VCC pin of reverse exciting switching voltage regulator pwm chip,
And the colelctor electrode of the PNP triode is electrically connected with the VCC pin of reverse exciting switching voltage regulator pwm chip；
One end of the 3rd resistor is electrically connected between the emitter stage of the NPN triode and the 4th resistance, the other end
It is electrically connected between the colelctor electrode of the PNP triode and second voltage-regulator diode.
It is preferred that, the negative electrode of first voltage-regulator diode is electrically connected with the base stage of the NPN triode, plus earth.
It is preferred that, the negative electrode of second voltage-regulator diode is electrically connected with the colelctor electrode of the PNP triode, and anode connects
Ground.
The power starting circuit for the output short circuit protection small power consumption that the utility model is provided is in module switch power output end
When occurring short circuit exception below, the power consumption of power supply by module switch power input lower power consumption to minimum level, can be reduced
And protection module module will not be burnt out because of high temperature when short-circuit abnormal.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding to of the present utility model, constitutes the part of the application,
Do not constitute to it is of the present utility model it is improper limit, in the accompanying drawings：
Fig. 1 is prior art circuits schematic diagram；
Fig. 2 is the utility model embodiment circuit theory diagrams.
Embodiment
Describe the utility model in detail below in conjunction with accompanying drawing and specific embodiment, herein signal of the present utility model
Property embodiment and explanation be used for explaining the utility model, but be not intended as limiting of the present utility model；
Embodiment
As shown in Fig. 2 a kind of power starting circuit of output short circuit protection small power consumption, including NPN triode Q1, PNP tri-
Pole pipe Q2, the first voltage-regulator diode Z1, the second voltage-regulator diode Z2, first resistor R1, second resistance R2,3rd resistor R3 and
4th resistance R4；The base stage of the NPN triode Q1 is electrically connected by first resistor R1 with power supply, and electricity is started to obtain
Pressure, the negative electrode of the first voltage-regulator diode Z1 is electrically connected with the base stage of the NPN triode Q1, and plus earth passes through first
Voltage-regulator diode Z1 provides voltage stabilizing, the grounded emitter of the NPN triode Q1 for the base stage of the NPN triode Q1；It is described
PNP triode Q2 base stage is electrically connected with the colelctor electrode of the NPN triode Q1, and emitter stage passes through second resistance R2 and power supply electricity
Source is electrically connected, and the negative electrode of the second voltage-regulator diode Z2 is electrically connected with the colelctor electrode of the PNP triode Q2, plus earth,
PNP triode Q2 colelctor electrode provides voltage stabilizing, and institute by the second voltage-regulator diode Z2 for the colelctor electrode of the PNP triode Q2
PNP triode Q2 colelctor electrode is stated to electrically connect with the VCC pin of reverse exciting switching voltage regulator pwm chip；The 3rd resistor R3's
One end is electrically connected between the emitter stage of the NPN triode Q1 and the 4th resistance R4, and the other end is electrically connected to the poles of PNP tri-
Between pipe Q2 colelctor electrode and the second voltage-regulator diode Z2.
The design circuit course of work：Reverse exciting switching voltage regulator control chip VCC powers as the feedback winding warp of T1 transformers
There is provided after rectifying and wave-filtering, the 5th resistance R5 is current-limiting resistance, the first diode D1 is VCC commutation diodes, and the first electric capacity C1 is
Filter capacitor, starts voltage and takes input voltage to provide by constant-current circuit, and first resistor R1 and second resistance R2 are startup resistance,
NPN triode Q1 and PNP triode Q2,3rd resistor R3 and the 4th resistance R4 composition constant-current circuit, the first voltage-regulator diode Z1
Voltage stabilizing is provided for the base stage of NPN triode Q1, the second voltage-regulator diode Z2 provides voltage stabilizing for IC VCC, as power supply Vo+ and GND
When short-circuit, feedback power supply is stopped power supply, and IC is powered by constant-current circuit again, and whole power supply can beating in startup-shut-off-startup
The circulating mode of operation of belch formula, because start-up circuit uses the startup scheme of constant current mode, supply current is limited, opens power supply
Working time after dynamic is very of short duration, so input average current is small, the power consumption very little of consumption；IC is reverse exciting switching voltage regulator PWM
Control chip；D2 is output Rectifying Schottky diodes, and C2 is output filter capacitor；The design start-up circuit uses constant-current circuit
Design to start to pwm chip VCC and power, during output short-circuit, it is that the circuit will not be carried to VCC that feedback power supply, which is stopped power supply,
For the power supply of larger current, the IC startup time holds very much, and input current is small and power consumption is relatively low, and protective value is more excellent.
The technical scheme that the utility model embodiment is provided is described in detail above, it is used herein specifically
Individual example is set forth to the principle and embodiment of the utility model embodiment, and the explanation of above example is only applicable to side
Assistant solves the principle of the utility model embodiment；Simultaneously for those of ordinary skill in the art, implement according to the utility model
Example, will change, in summary, this specification content should not be construed as in embodiment and application
To limitation of the present utility model.
Claims (3)
1. a kind of power starting circuit of output short circuit protection small power consumption, it is characterised in that：
Including NPN triode, PNP triode, the first voltage-regulator diode, the second voltage-regulator diode, first resistor, second resistance,
3rd resistor and the 4th resistance；
The base stage of the NPN triode is electrically connected by first resistor with power supply, to obtain startup voltage, and passes through first
Voltage-regulator diode provides voltage stabilizing, the grounded emitter of the NPN triode for the base stage of the NPN triode；
The base stage of the PNP triode is electrically connected with the colelctor electrode of the NPN triode, and emitter stage passes through second resistance and power supply
Power electric connection, and provide voltage stabilizing, and institute by the second voltage-regulator diode for the VCC pin of reverse exciting switching voltage regulator pwm chip
The colelctor electrode of PNP triode is stated to electrically connect with the VCC pin of reverse exciting switching voltage regulator pwm chip；
One end of the 3rd resistor is electrically connected between the emitter stage of the NPN triode and the 4th resistance, and the other end is electrically connected
It is connected between the colelctor electrode of the PNP triode and second voltage-regulator diode.
2. the power starting circuit of output short circuit protection small power consumption as claimed in claim 1, it is characterised in that：Described first is steady
The negative electrode of pressure diode is electrically connected with the base stage of the NPN triode, plus earth.
3. the power starting circuit of output short circuit protection small power consumption as claimed in claim 1, it is characterised in that：Described second is steady
The negative electrode of pressure diode is electrically connected with the colelctor electrode of the PNP triode, plus earth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720287529.5U CN206595889U (en) | 2017-03-23 | 2017-03-23 | The power starting circuit of output short circuit protection small power consumption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720287529.5U CN206595889U (en) | 2017-03-23 | 2017-03-23 | The power starting circuit of output short circuit protection small power consumption |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206595889U true CN206595889U (en) | 2017-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720287529.5U Active CN206595889U (en) | 2017-03-23 | 2017-03-23 | The power starting circuit of output short circuit protection small power consumption |
Country Status (1)
| Country | Link |
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| CN (1) | CN206595889U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108174482A (en) * | 2017-12-28 | 2018-06-15 | 无锡昌至盛机械制造有限公司 | A kind of high-voltage starting circuit of supper-fast low-power consumption |
-
2017
- 2017-03-23 CN CN201720287529.5U patent/CN206595889U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108174482A (en) * | 2017-12-28 | 2018-06-15 | 无锡昌至盛机械制造有限公司 | A kind of high-voltage starting circuit of supper-fast low-power consumption |
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