CN109217258A - A kind of control circuit - Google Patents
A kind of control circuit Download PDFInfo
- Publication number
- CN109217258A CN109217258A CN201811242477.5A CN201811242477A CN109217258A CN 109217258 A CN109217258 A CN 109217258A CN 201811242477 A CN201811242477 A CN 201811242477A CN 109217258 A CN109217258 A CN 109217258A
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- Prior art keywords
- control
- resistance
- control module
- voltage
- module
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
Abstract
The invention discloses a kind of control circuits; for controlling turning on and off for protection mechanism; including division module and control module; the division module input terminal connects voltage Vdd; the division module output end connects the first input end of four control modules; second input terminal of the control module connects the supply voltage Vcc of the protection mechanism, and the output end of the control module connects the energization input of the protection mechanism；The division module is used for sampled voltage Vdd and exports the first input end of a sampled voltage signal to the control module, the control module is equipped with threshold voltage, the control module carries out output control according to comparison result for being compared the sampled voltage with threshold voltage.The present invention can control the working condition of protection mechanism at different ambient temperatures, and flexibly and easily, the application environment demand of more applicable complexity, circuit is simple, only need several common devices, and at low cost, debugging is flexible and convenient.
Description
Technical field
The present invention relates to the field of power supplies with protection mechanism, especially a kind of control circuit with protection mechanism.
Background technique
In Switching Power Supply of today production, the various protection mechanisms of product can allow product to be widely used in various environment,
And can guarantee the reliability of product, for example, input undervoltage protection is exactly one of protection mechanism.But since Switching Power Supply produces
Product application environment is extensive, according to the application demand of client, it is desirable that part protection mechanism works under specific environment temperature, such as exists
- 25 DEG C of low temperature or less protection mechanisms do not work, and work in -25 DEG C of low temperature or more protection mechanisms, to better meet answering for client
With demand, there is no such functions for the protection mechanism in industry at present.
Summary of the invention
The present invention provides a kind of control circuits, for controlling turning on and off for protection mechanism, especially in the day and night temperature difference
It is applied in the product in big regional time zone, effect becomes apparent.Control circuit circuit of the invention is simple, circuit miniaturization.
The purpose of the present invention is what is be achieved through the following technical solutions, a kind of control circuit, for controlling protection mechanism
It turns on and off, including division module and control module；Including division module and control module；The input terminal of the division module
Voltage Vdd is connected, the output end of the division module connects the first input end of the control module, and the of the control module
Two input terminals connect the supply voltage Vcc of the protection mechanism, and the output end of the control module connects the protection mechanism
Energization input；
The division module is for sampled voltage Vdd and to export a sampled voltage signal first defeated to the control module
Entering end, the control module is equipped with threshold voltage, and the control module is used to for the sampled voltage being compared with threshold voltage,
And output control is carried out according to comparison result；When the sampled voltage of division module output is less than threshold voltage, the control
The shutdown of molding block, the protection mechanism do not work；It is described when the sampled voltage of division module output is greater than threshold voltage
Control module conducting, supply voltage Vcc are powered by the control module to the protection mechanism, and the protection mechanism starts work
Make.
Preferably, the division module includes one end connection voltage Vdd of resistance R1 and resistance R2, the resistance R1, institute
The other end for stating resistance R1 connects one end of the resistance R2, and the series connection point of the resistance R1 and resistance R2 is as described point
The other end of the output end of die block, the resistance R2 connects ground.
Preferably, one end of the location swap of the resistance R1 and resistance R2, i.e., the described resistance R2 connects voltage Vdd, institute
The other end for stating resistance R2 connects one end of the resistance R1, output end of the series connection point as the division module, the electricity
The other end for hindering R1 connects ground.
Preferably as a kind of improvement project of division module, the division module further includes zener diode Z1, described
The cathode of zener diode Z1 connects the series connection point of the resistance R1 Yu the resistance R2, and the output as the division module
The anode at end, the zener diode Z1 connects ground.
Preferably, the resistance R2 is thermistor.
Preferably, the thermistor R2 is positive temperature coefficient thermistor (PTC).This resistor feature is environment degree
More high resistance is bigger.
Preferably, the thermistor R2 is negative temperature coefficient thermistor (NTC).This resistor feature is environment degree
More high resistance is smaller.
Preferably, the control module includes control chip U1, and the reference foot of the control chip U1 is the control mould
The first input end of block, the energization pins of the control chip U1 are the second input terminal of the control module, the control core
The output pin of piece U1 is the output end of the control module.
Preferably, the control chip U1 is benchmark source of stable pressure TL431；The reference foot of the reference voltage stabilizing source TL431 is
The first input end of the control module, the cathode of the reference voltage stabilizing source TL431 are the second input terminal of the control module,
The anode of the reference voltage stabilizing source TL431 is the output end of the control module.
The operation principle of the present invention is that:
When ambient temperature variation, the resistance value of the thermistor R2 in the division module is also changed with temperature,
Since the type selecting of thermistor is different, the trend that the resistance value of thermistor R2 varies with temperature is also different, and the division module is defeated
Sampled voltage out will also change with the change in resistance of thermistor R2；The sampled voltage of the division module output is sent to
The control module, the threshold voltage being arranged in the control module is compared with the sampled voltage, when sampled voltage is small
When threshold voltage, the control module shutdown, the protection mechanism does not work；When sampled voltage is greater than threshold voltage,
The control module conducting, the supply voltage Vcc are powered by the control module to protection mechanism, the protection mechanism
Start work.
Compared with prior art, the invention has the following beneficial effects:
1) this programme is simple, and number of devices is few, easily designed, at low cost convenient for debugging；
2) controllable working condition of protection mechanism in the environment of not having to of the present invention；
3) power supply circuit of the present invention does not influence the reliability of defencive function.
Detailed description of the invention
Fig. 1 is the principle of the present invention block diagram；
Fig. 2 is the circuit diagram of the real example of control circuit first of the invention；
Fig. 3 is the circuit diagram of the real example of control circuit second of the invention；
Fig. 4 is the circuit diagram of control circuit 3rd embodiment of the invention；
Fig. 5 is the circuit diagram of control circuit fourth embodiment of the invention.
Specific embodiment
Fig. 1 be control circuit of the invention functional block diagram, a kind of control circuit, for control protection mechanism open and
Shutdown, including division module and control module；The input terminal of the division module connects voltage Vdd, the division module it is defeated
Outlet connects the first input end of the control module, and the second input terminal of the control module connects the confession of the protection mechanism
Piezoelectric voltage Vcc, the output end of the control module connect the energization input of the protection mechanism.
In order to be better understood by the present invention, below with reference to specific embodiments and the drawings, the present invention is further described.
First embodiment
As shown in Fig. 2, being the circuit diagram of control circuit of the invention.Wherein division module includes resistance R2 and positive temperature
Coefficient resistors R1 is spent, which is that environment degree more high resistance is bigger, and control circuit includes control chip U1.
Each circuit connecting relation are as follows: one end of the resistance R1 connects voltage Vdd, described in the other end connection of the resistance R1
The reference foot of one end of resistance R2 and the control chip U1, for this tie point as a common node, the resistance R2's is another
One end connection ground, the energization pins of the control chip U1 connect supply voltage Vcc, and the output pin of the control chip U1 connects
The protection mechanism is connect, is powered to the protection mechanism.
The working principle of the present embodiment are as follows: when circuit works normally, the resistance R1 in the division module and R2 pairs of resistance
Voltage Vdd carries out sampling partial pressure, and exports sampled voltage in the series connection point of the two, i.e., the end voltage of the described resistance R2 is simultaneously
The reference foot voltage of the control chip U1, a threshold voltage is arranged in the control chip U1, and (threshold value is to correspond to environment temperature
Different threshold sizes can be arranged in the threshold voltage of degree according to demand), the control module is electric by the sampled voltage and the threshold value
Pressure is compared, and controls its working condition according to the size of two voltage signals, to realize the control to protection mechanism: when
When sampled voltage is less than threshold voltage, control module shutdown, the protection mechanism can not normal power supply do not work；When adopting
When sample voltage is greater than threshold voltage, the control module conducting, the supply voltage Vcc gives protection machine by the control module
System power supply, the protection mechanism start work.Under circuit normal operating conditions, sampled voltage is greater than threshold voltage, controls core
Piece U1 is open-minded, and protection mechanism starts work.
When environment temperature is lower and lower, the resistance value of the resistance R2 will be smaller and smaller, therefore the division module exports
The sampled voltage reference foot voltage of chip (control) it is also smaller and smaller, when ambient temperature is reduced to certain temperature (such as-
It is 25 DEG C, even lower), the threshold voltage that the sampled voltage of the division module output is less than control chip U1 (is set as at this time
Corresponding -25 DEG C of temperature threshold) when, control chip U1 cut-off, Vcc voltage will stop carrying out protection mechanism by control chip
Power supply, protection mechanism stops working, and then protects the products from damage；
When environment temperature is gone back up to certain high temperature (for example, being higher than -25 DEG C), the sampling of the division module output is electric
Pressure rises, and after the sampled voltage is higher than the threshold voltage of the control chip U1, control chip U1 will restart work, and
It powers to protection mechanism, protection mechanism works on.
It should be noted that controlling chip U1 in the present embodiment can be replaced with reference voltage stabilizing source TL431, control mould can be done
A kind of preferred embodiment of block.The reference foot of the corresponding reference voltage stabilizing source TL431 connects division module output end, i.e., the described electricity
The series connection point of R1 and the resistance R2 are hindered, the cathode of the reference voltage stabilizing source TL431 connects supply voltage Vcc, and the benchmark is steady
The anode of potential source TL431 is powered to protection mechanism.
To sum up, control circuit of the invention can according to the application demand of client, by the way that the threshold value of control module is arranged, from
And control protection mechanism and work under specific environment temperature, and circuit implementation is simple, number of devices is few, and it is easily designed,
It is at low cost convenient for debugging.
Second embodiment
As shown in figure 3, being the circuit diagram of control circuit second embodiment of the invention.It is different from the first embodiment
Be: resistance R2 is thermistor；It, can be by two according to series characteristic and since resistance R1 and resistance R2 is series relationship
The position of person is interchangeable.
Its connection relationship are as follows: one end of the resistance R2 connects voltage Vdd, and the other end of the resistance R2 connects the resistance
The reference foot of one end of R1 and the control chip U1, this node connect as a common node, the other end of the resistance R1
Ground connection, the cathode of the control chip U1 connect supply voltage Vcc, and the anode of the control chip U1 connects the protection machine
System is powered to the protection mechanism.
The working principle of the present embodiment is as follows: similarly with embodiment one, when circuit works normally, in the division module
Resistance R1 and resistance R2 carries out sampling partial pressure to voltage Vdd, and exports sampled voltage in the division module output end, is at this time
It for the end voltage of the resistance R1, while being reference the foot voltage of the control chip U1, one threshold of the control chip U1 setting
Threshold voltage (threshold value is the threshold voltage of corresponding environment temperature, and different threshold sizes can be arranged according to demand), the control
The sampled voltage is compared by module with the threshold voltage, and realizes the control to protection mechanism according to comparison signal size:
When sampled voltage is less than threshold voltage, the control module shutdown, the protection mechanism does not work；When sampled voltage is greater than
When threshold voltage, the control module conducting, the supply voltage Vcc is powered by the control module to protection mechanism, institute
The protection mechanism starting work stated.Under circuit normal operating conditions, sampled voltage is greater than threshold voltage, and control chip U1 is open-minded,
Protection mechanism starts work.
The working principle of the present embodiment and first embodiment the difference is that: resistance R2 use negative temperature coefficient resister
Device, it is smaller that resistor feature is that environment degree gets over high resistance.When environment temperature is lower and lower, the resistance value of resistance R2 is bigger, makes
The sampled voltage (voltage on the resistance R1) for obtaining the division module partial pressure output is also smaller and smaller, when environment temperature reduces
Voltage to certain temperature (for example, -25 DEG C, even lower), the division module output is less than the threshold value electricity of control chip U1
When pressing (threshold voltage for being correspondingly arranged -25 DEG C), control chip U1 cut-off, Vcc voltage stops through control chip U1 to protection
Mechanism power supply, protection mechanism stop working.
When environment temperature goes back up to certain high temperature, the sampled voltage of the division module output rises, when the sampling
After voltage is higher than the threshold voltage of the control chip U1, control chip U1 will restart work, and power to protection mechanism,
Protection mechanism works on.
3rd embodiment
Fig. 4 is the circuit diagram of control circuit 3rd embodiment of the invention, different from the first embodiment, it is described
Control circuit further includes a voltage-stabiliser tube Z1, and the anode of the voltage-stabiliser tube Z1 connects one end of the resistance R2, the voltage-stabiliser tube
The cathode of Z1 connects ground, other connection types are constant.
In view of the electrical characteristic of many application environments and product device, its voltage exported can at work for division module
Energy can be excessively high, and then is more than the threshold voltage of control chip U1, and control chip U1 is caused to damage.Division module output end simultaneously
The voltage of division module output can be vised by entering voltage-stabiliser tube Z1, so as not to overtension and damage control chip U1, and voltage-stabiliser tube
Breakdown voltage need to be greater than the threshold voltage of control module.
The working principle of the present embodiment circuit is as embodiment, it can be achieved that equivalent efficacy.
Fourth embodiment
Fig. 5 is the circuit diagram of control circuit fourth embodiment of the invention, and the present embodiment is based on second embodiment
On improvement: the output end of division module in a second embodiment is incorporated to voltage-stabiliser tube Z1, and the cathode of voltage-stabiliser tube Z1 is connected to point
Between the output of die block and the input of control module, the anode of voltage-stabiliser tube Z1 connects ground.
The voltage-stabiliser tube Z1 that this implementation is added can this voltage-stabiliser tube can vise division module output voltage, in order to avoid partial pressure mould
Block overtension damage control chip U1, can effectively increase circuit reliability.
The working principle of the present embodiment is identical as second embodiment, it can be achieved that equivalent efficacy.
The above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as this
The limitation of invention, on the basis of Fig. 1 functional block diagram of the present invention, for those skilled in the art, not
It is detached from the spirit and scope of the present invention, alternatively improved and retouching can also be made, such as by control circuit amplifier and three
The circuit substitution of pole pipe composition, is still able to achieve identical function, these improve and retouch also in protection scope of the present invention, here not
It is repeated again with embodiment, protection scope of the present invention should be subject to claim limited range.
Claims (9)
1. a kind of control circuit, for controlling turning on and off for protection mechanism, it is characterised in that: including division module and control
Module；The input terminal of the division module connects voltage Vdd, and the output end of the division module connects the of the control module
One input terminal, the second input terminal of the control module connect the supply voltage Vcc of the protection mechanism, the control module
Output end connects the energization input of the protection mechanism；
The division module is for sampled voltage Vdd and exports the first input of a sampled voltage signal to the control module
End, the control module are equipped with threshold voltage, and the control module is used to for the sampled voltage being compared with threshold voltage, and
Output control is carried out according to comparison result；When the sampled voltage of division module output is less than threshold voltage, the control
Module shutdown, the protection mechanism do not work；When the sampled voltage of division module output is greater than threshold voltage, the control
The conducting of molding block, supply voltage Vcc are powered by the control module to the protection mechanism, and the protection mechanism starts work
Make.
2. a kind of control circuit according to claim 1, it is characterised in that: the division module includes resistance R1 and resistance
One end of R2, the resistance R1 connect voltage Vdd, and the other end of the resistance R1 connects one end of the resistance R2, the electricity
Output end of the series connection point of R1 and the resistance R2 as the division module is hindered, the other end of the resistance R2 connects ground.
3. a kind of control circuit according to claim 1, it is characterised in that: the position of the resistance R1 and resistance R2 is mutual
It changes, i.e., one end of the described resistance R2 connects voltage Vdd, and the other end of the resistance R2 connects one end of the resistance R1, the string
Output end of the connection point as the division module, the other end of the resistance R1 connect ground.
4. a kind of control circuit according to claim 2 or 3, it is characterised in that: the division module further includes pressure stabilizing two
Pole pipe Z1, the cathode of the zener diode Z1 connect the series connection point of the resistance R1 Yu the resistance R2, and as described point
The anode of the output end of die block, the zener diode Z1 connects ground.
5. a kind of control circuit according to claim 4, it is characterised in that: the resistance R2 is thermistor.
6. a kind of control circuit according to claim 5, it is characterised in that: the thermistor R2 is positive temperature coefficient heat
Sensitive resistor (PTC).
7. a kind of control circuit according to claim 5, it is characterised in that: the thermistor R2 is negative temperature coefficient heat
Sensitive resistor (NTC).
8. a kind of control circuit according to claim 1, it is characterised in that: the control module includes control chip U1,
The reference foot of the control chip U1 is the first input end of the control module, and the energization pins of the control chip U1 are institute
The second input terminal of control module is stated, the output pin of the control chip U1 is the output end of the control module.
9. a kind of control circuit according to claim 8, it is characterised in that: the control chip U1 is benchmark source of stable pressure
TL431；The reference foot of the reference voltage stabilizing source TL431 is the first input end of the control module, the reference voltage stabilizing source
The cathode of TL431 is the second input terminal of the control module, and the anode of the reference voltage stabilizing source TL431 is the control mould
The output end of block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811242477.5A CN109217258A (en) | 2018-10-24 | 2018-10-24 | A kind of control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811242477.5A CN109217258A (en) | 2018-10-24 | 2018-10-24 | A kind of control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109217258A true CN109217258A (en) | 2019-01-15 |
Family
ID=64996506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811242477.5A Withdrawn CN109217258A (en) | 2018-10-24 | 2018-10-24 | A kind of control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109217258A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751700A (en) * | 2012-06-28 | 2012-10-24 | 惠州市德赛视听科技有限公司 | Over-temperature protection circuit |
| US20140197739A1 (en) * | 2013-01-17 | 2014-07-17 | Upi Semiconductor Corp. | DC-DC Converter Protection Circuit and Protection Method Thereof |
| CN203981750U (en) * | 2014-07-23 | 2014-12-03 | 温州市天齐电器有限公司 | Pointer-type safety current table |
| CN205584024U (en) * | 2016-02-01 | 2016-09-14 | 广州视源电子科技股份有限公司 | Take switching power supply circuit of excess temperature protection |
-
2018
- 2018-10-24 CN CN201811242477.5A patent/CN109217258A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102751700A (en) * | 2012-06-28 | 2012-10-24 | 惠州市德赛视听科技有限公司 | Over-temperature protection circuit |
| US20140197739A1 (en) * | 2013-01-17 | 2014-07-17 | Upi Semiconductor Corp. | DC-DC Converter Protection Circuit and Protection Method Thereof |
| CN203981750U (en) * | 2014-07-23 | 2014-12-03 | 温州市天齐电器有限公司 | Pointer-type safety current table |
| CN205584024U (en) * | 2016-02-01 | 2016-09-14 | 广州视源电子科技股份有限公司 | Take switching power supply circuit of excess temperature protection |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190115 |
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| WW01 | Invention patent application withdrawn after publication |