CN209282824U - A kind of input undervoltage protection control circuit based on temperature - Google Patents
A kind of input undervoltage protection control circuit based on temperature Download PDFInfo
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- CN209282824U CN209282824U CN201822123884.6U CN201822123884U CN209282824U CN 209282824 U CN209282824 U CN 209282824U CN 201822123884 U CN201822123884 U CN 201822123884U CN 209282824 U CN209282824 U CN 209282824U
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Abstract
The utility model discloses a kind of input undervoltages based on temperature to protect control circuit; for controlling electrically connecting and disconnecting for input voltage Vdc and input undervoltage protection circuit; including temperature sampling module and control module; the temperature sampling module input electrically connects voltage Vdc; the temperature sampling module output end electrically connects the first input end of the control module; second input terminal of the control module electrically connects the input voltage Vdc of the protection mechanism, and the output end of the control module electrically connects the input undervoltage protection circuit；The utility model can control working condition of input undervoltage protection circuit at a temperature of low temperature environment, 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 utility model relates to the circuit with protection mechanism, especially a kind of control with input undervoltage defencive function
Circuit.
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, input is realized in industry at present
Bulky capacitor voltage before the sampled voltage or sampling rectifier bridge of under-voltage protection or after sampling rectifier bridge, is produced with realizing
The input undervoltage of product is protected；If but the bulky capacitor voltage after sampling rectifier bridge is exactly temperature with certain limitation
Degree, input capacitance results in the electrology characteristic parameter of capacitor to generate larger difference, such as capacitance and ESR due to low temperature environment, defeated
The capacitance for entering capacitor becomes smaller, and starts moment in product, and the electrical characteristic of device is restored not in time, if product is opened in this state
It is dynamic, it will lead to the brownout at input capacitance both ends, trigger under-voltage protection function, and then product is caused to enter under-voltage protection mould
Formula and can not normally start, there is phenomena such as output voltage hiccup, so that product rear end equipment breaks down, cause biggish
Loss.
Now needing a kind of product, input undervoltage defencive function does not work at low ambient temperatures, and inputs under room temperature and hot environment
Under-voltage protection function keeps work, to guarantee the reliability of product.
Utility model content
The utility model provides a kind of input undervoltage protection control circuit based on temperature, protects for controlling input undervoltage
Protection circuit turns on and off, and especially in the products application of high and low temperature environment, effect is become apparent.The control electricity of the utility model
Road circuit is simple, circuit miniaturization.
The purpose of this utility model is achieved through the following technical solutions, a kind of input undervoltage protection control based on temperature
Circuit processed, for controlling electrically connecting and disconnecting for input voltage Vdc and input undervoltage protection circuit, including temperature sampling module and
Control module；The input terminal of the temperature sampling module electrically connects input voltage Vdc, the output end electricity of the temperature sampling module
Couple the first input end of the control module, the second input terminal of the control module electrically connects input voltage Vdc, the control
The output end of molding block electrically connects input undervoltage protection circuit；
A kind of input undervoltage protection control circuit based on temperature, is protected for controlling input voltage Vdc and input undervoltage
Circuit electrically connecting and disconnecting, including temperature sampling module and control module；The input terminal of the temperature sampling module electrically connects
The output end of input voltage Vdc, the temperature sampling module electrically connect the first input end of the control module, the control
Second input terminal of module electrically connects input voltage Vdc, and the output end of the control module electrically connects input undervoltage protection circuit.
Preferably, the temperature sampling module includes resistance R1 and PTC resistor R2, and the one of the resistance R1
End electrically connects input voltage Vdc, and the other end of the resistance R1 electrically connects one end of the PTC resistor R2 and work
The other end for the output end of the temperature sampling module, the PTC resistor R2 is grounded.
Preferably, the temperature sampling module includes resistance R1 and thermistor R3, the negative temperature coefficient
One end of resistor R3 electrically connects input voltage Vdc, and the other end of the thermistor R3 electrically connects the resistance
One end of R1 and output end as the temperature sampling module, the other end Electricity Federation ground connection of the resistance R1.
Preferably, the temperature sampling module further includes zener diode Z1, the cathode Electricity Federation of the zener diode Z1
Connect the output end of the temperature sampling module, the plus earth of the zener diode Z1.
Preferably, the control module includes metal-oxide-semiconductor, and the grid of the metal-oxide-semiconductor is the first input of the control module
End, the drain electrode of the metal-oxide-semiconductor are the second input terminal of the control module, and the source electrode of the metal-oxide-semiconductor is the control module
Output end.
The working principle of the utility model are as follows:
When ambient temperature variation, the resistance value of the thermistor R2 in the temperature sampling module also becomes with temperature
Change, since the type selecting of thermistor is different, the trend that the resistance value of thermistor R2 varies with temperature is also different, the temperature sampling
The sampled voltage of module output will also change with the change in resistance of thermistor R2；The voltage of the temperature sampling module output
It is sent to the control module, the threshold voltage being arranged in the control module is compared with the voltage, when voltage is less than
When threshold voltage, the control module shutdown, the input undervoltage protects not starting protection mechanism；When voltage is greater than threshold value electricity
When pressure, the control module conducting, the input voltage Vdc electrically connects the sample circuit of input undervoltage protection, and input undervoltage is protected
Protect starting protection mechanism.
Compared with prior art, the utility model 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) the utility model can control working condition of protection mechanism in the environment of not having to；
3) the utility model does not influence the reliability of defencive function.
Detailed description of the invention
Fig. 1 is the functional block diagram of existing traditional input undervoltage protection；
Fig. 2 is the functional block diagram that the control circuit of the utility model is applied；
Fig. 3 is the circuit diagram of the control circuit first embodiment of the utility model；
Fig. 4 is the circuit diagram of the control circuit second embodiment of the utility model；
Fig. 5 is the circuit diagram of the control circuit 3rd embodiment of the utility model；
Fig. 6 is the circuit diagram of the control circuit fourth embodiment of the utility model.
Specific embodiment
Fig. 2 is the functional block diagram that the control circuit of the utility model is applied, a kind of under-voltage protection control based on temperature input
Circuit processed, for controlling electrically connecting and disconnecting for input voltage Vdc and input undervoltage protection circuit, including temperature sampling module and
Control module；The input terminal of the temperature sampling module electrically connects voltage Vdc, and the output end of the temperature sampling module electrically connects
The first input end of the control module, the second input terminal of the control module electrically connect input Vdc, the control module
Output end electrically connects input undervoltage protection.
In order to be better understood by the utility model, below with reference to specific embodiments and the drawings, to the utility model into one
Walk explanation.
First embodiment
As shown in figure 3, the circuit diagram of the control circuit for the utility model.Wherein temperature sampling module includes resistance
The characteristics of R1 and PTC resistor R2, R2 is that environment temperature more high resistance is bigger, and control circuit includes metal-oxide-semiconductor Q1.
Each circuit electrically connects relationship are as follows: one end of the resistance R1 electrically connects input voltage Vdc, and the resistance R1's is another
End electrically connects one end of PTC resistor R2 and the grid of the metal-oxide-semiconductor Q1, this Electricity Federation contact is as a public section
Point, the other end ground connection of the resistance R2, the drain electrode of the metal-oxide-semiconductor electrically connect input voltage Vdc, the source electrode electricity of the metal-oxide-semiconductor
Couple input undervoltage protection circuit.
The working principle of the present embodiment are as follows: electricity when circuit is in some temperature of non-cryogenic, in the temperature sampling module
Resistance R1 and resistance R2 carries out sampling partial pressure to voltage Vdc, and in the series connection point output voltage of the two, i.e., and the two of the described resistance R2
Voltage is held, while being the grid voltage of the metal-oxide-semiconductor, a threshold voltage is arranged in the metal-oxide-semiconductor, and (threshold value is to correspond to environment temperature
Different threshold sizes can be arranged in the threshold voltage of degree according to demand), when the grid voltage of metal-oxide-semiconductor is greater than the electric conduction of metal-oxide-semiconductor
When pressure, metal-oxide-semiconductor conducting, the input voltage Vdc electrically connects input undervoltage protection, and input undervoltage protects starting protection mechanism, instead
?.Vcc is to the supply voltage of input undervoltage protection circuit.
When environment temperature is lower and lower, the resistance value of the resistance R2 will be smaller and smaller, therefore the temperature sampling module
The sampled voltage (i.e. the grid voltage of metal-oxide-semiconductor) of output is also smaller and smaller, when ambient temperature is reduced to certain temperature (such as-
It is 25 DEG C, even lower), threshold voltage of the voltage of temperature sampling module output less than metal-oxide-semiconductor Q1 (is set as pair at this time
Answer -25 DEG C of temperature threshold) when, metal-oxide-semiconductor Q1 shutdown, when environment temperature goes back up to certain high temperature (for example, being higher than -25
DEG C), the sampled voltage of the temperature sampling module output rises, after the sampled voltage is higher than the threshold voltage of the metal-oxide-semiconductor,
Metal-oxide-semiconductor will restart work, and power to protection mechanism, and protection mechanism works on, and then protects the products from damage.
To sum up, the control circuit of the utility model can be according to the application demand of client, by the threshold that control module is arranged
Value, so that input undervoltage defencive function starting protection mechanism under specific environment temperature is controlled, and circuit implementation is simple,
Number of devices is few, easily designed, at low cost convenient for debugging.
Second embodiment
As shown in figure 4, the circuit diagram of the control circuit for the utility model second embodiment.Not with first embodiment
With: the resistor R2 of positive temperature coefficient is replaced for thermistor R3；And adjust connection relationship.
Its connection relationship are as follows: one end of the thermistor R3 connects voltage Vdc, the negative temperature coefficient resister
The other end of device R3 electrically connects one end of the resistance R1 and the grid of the metal-oxide-semiconductor, this node is as temperature sampling module
Output end, the other end ground connection of the resistance R1, the drain electrode of the metal-oxide-semiconductor electrically connect input voltage Vdc, the source of the MOS pipe
Pole electrically connects the input undervoltage protection circuit.
The working principle of the present embodiment is as follows: similarly with embodiment one, when circuit works normally, the temperature sampling module
In resistance R1 and thermistor R3 sampling partial pressure carried out to voltage Vdc, and exported in the temperature sampling module
Output voltage is held, at this time the end voltage of the as described resistance R1, while being the grid voltage of the metal-oxide-semiconductor, the metal-oxide-semiconductor setting
One threshold voltage (threshold value is the threshold voltage of corresponding environment temperature, and different threshold sizes can be arranged according to demand), works as electricity
When pressure is less than threshold voltage, the control MOS shutdown, the input undervoltage protects not starting protection mechanism；When voltage is greater than threshold
When threshold voltage, the MOS conducting, the input undervoltage protects starting protection mechanism.Under circuit normal operating conditions, MOS pipe
Grid voltage is greater than threshold voltage, and metal-oxide-semiconductor is open-minded, and the input undervoltage protects starting protection mechanism.
The working principle of the present embodiment and first embodiment the difference is that: R3 use thermistor, electricity
It is smaller that resistance device feature is that environment temperature gets over high resistance.When environment temperature is lower and lower, the resistance value of R3 is bigger, so that the temperature
The voltage (voltage on the resistance R1) for spending sampling module partial pressure output is also smaller and smaller, when environment temperature is reduced to certain temperature
It spends (for example, -25 DEG C, even lower), the threshold voltage that the voltage of the temperature sampling module output is less than metal-oxide-semiconductor is (corresponding to set
Set -25 DEG C of threshold voltage) when, metal-oxide-semiconductor shutdown, the input undervoltage protects starting protection mechanism.
When environment temperature goes back up to certain high temperature, the voltage of the temperature sampling module output rises, when the sampling
After voltage is higher than the threshold voltage of the metal-oxide-semiconductor, metal-oxide-semiconductor will restart work, and the input undervoltage protects starting protection machine
System.
3rd embodiment
Fig. 5 is the circuit diagram of the control circuit 3rd embodiment of the utility model, different from the first embodiment,
The temperature sampling module further includes a voltage-stabiliser tube Z1, and the cathode of the voltage-stabiliser tube Z1 electrically connects one end of the resistance R2,
The positive Electricity Federation of the voltage-stabiliser tube Z1 is grounded, and it is constant that other electrically connect mode.
The effect of the Z1: in view of the electrical characteristic of many application environments and product device, temperature sampling module is in work
Its voltage exported may be excessively high when making, and then is more than the threshold voltage of metal-oxide-semiconductor, and metal-oxide-semiconductor is caused to damage.In temperature sampling mould
The output end of block be incorporated to voltage-stabiliser tube Z1 can vise temperature sampling module output voltage, in order to avoid overtension and damage metal-oxide-semiconductor,
And the breakdown voltage of voltage-stabiliser tube need to be greater than the threshold voltage of control module.
Fourth embodiment
Fig. 6 is the circuit diagram of the control circuit fourth embodiment of the utility model, unlike second embodiment,
The temperature sampling module further includes a voltage-stabiliser tube Z1, and the cathode of the voltage-stabiliser tube Z1 electrically connects one end of the resistance R1,
The positive Electricity Federation of the voltage-stabiliser tube Z1 is grounded, and it is constant that other electrically connect mode.
The effect of the Z1: in view of the electrical characteristic of many application environments and product device, temperature sampling module is in work
Its voltage exported may be excessively high when making, and then is more than the threshold voltage of metal-oxide-semiconductor, and metal-oxide-semiconductor is caused to damage.In temperature sampling mould
The output end of block be incorporated to voltage-stabiliser tube Z1 can vise temperature sampling module output voltage, in order to avoid overtension and damage metal-oxide-semiconductor,
And the breakdown voltage of voltage-stabiliser tube 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.
Above are merely preferred embodiments of the utility model, it is noted that above-mentioned preferred embodiment should not regard
For the limitation of the utility model, on the basis of the utility model Fig. 2 functional block diagram, for the ordinary skill people of the art
For member, without departing from the spirit and scope of the utility model, alternatively improved and retouching can also be made, such as will control
The circuit substitution of circuit amplifier and triode composition, is still able to achieve identical function, these are improved and retouching is also practical new at this
The protection scope of type, is no longer repeated with embodiment here.In addition, all connection/connection relationships being related in patent, not single
Refer to that component directly connects, and referring to can be according to specific implementation situation, by adding or reducing couple auxiliary, Lai Zucheng more preferably joins
Binding structure.The protection scope of the utility model should be defined by the scope defined by the claims..
Claims (5)
1. a kind of input undervoltage based on temperature protects control circuit, for controlling input voltage Vdc and input undervoltage protection electricity
Road electrically connecting and disconnecting, it is characterised in that: including temperature sampling module and control module；The input of the temperature sampling module
End electrically connects input voltage Vdc, and the output end of the temperature sampling module electrically connects the first input end of the control module, institute
The second input terminal for stating control module electrically connects input voltage Vdc, and the output end of the control module electrically connects input undervoltage guarantor
Protection circuit.
2. a kind of input undervoltage based on temperature according to claim 1 protects control circuit, it is characterised in that: the temperature
Spending sampling module includes resistance R1 and PTC resistor R2, and one end of the resistance R1 electrically connects input voltage Vdc, institute
The other end for stating resistance R1 electrically connects one end of the PTC resistor R2 and as the defeated of the temperature sampling module
Outlet, the other end ground connection of the PTC resistor R2.
3. a kind of input undervoltage based on temperature according to claim 1 protects control circuit, it is characterised in that: the temperature
Spending sampling module includes resistance R1 and thermistor R3, and one end of the thermistor R3 electrically connects defeated
Enter voltage Vdc, the other end of the thermistor R3 electrically connects one end of the resistance R1 and as the temperature
The output end of sampling module, the other end Electricity Federation ground connection of the resistance R1.
4. a kind of input undervoltage based on temperature according to claim 2 or 3 protects control circuit, it is characterised in that: institute
Stating temperature sampling module further includes zener diode Z1, and the cathode of the zener diode Z1 electrically connects the temperature sampling module
Output end, the plus earth of the zener diode Z1.
5. a kind of input undervoltage based on temperature according to claim 1 protects control circuit, it is characterised in that: the control
Molding block includes metal-oxide-semiconductor, and the grid of the metal-oxide-semiconductor is the first input end of the control module, and the drain electrode of the metal-oxide-semiconductor is institute
The second input terminal of control module is stated, the source electrode of the metal-oxide-semiconductor is the output end of the control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822123884.6U CN209282824U (en) | 2018-12-18 | 2018-12-18 | A kind of input undervoltage protection control circuit based on temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822123884.6U CN209282824U (en) | 2018-12-18 | 2018-12-18 | A kind of input undervoltage protection control circuit based on temperature |
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| CN209282824U true CN209282824U (en) | 2019-08-20 |
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| CN201822123884.6U Active CN209282824U (en) | 2018-12-18 | 2018-12-18 | A kind of input undervoltage protection control circuit based on temperature |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111023441A (en) * | 2019-12-30 | 2020-04-17 | Tcl空调器(中山)有限公司 | Air conditioner control method and system, storage medium and air conditioner |
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2018
- 2018-12-18 CN CN201822123884.6U patent/CN209282824U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111023441A (en) * | 2019-12-30 | 2020-04-17 | Tcl空调器(中山)有限公司 | Air conditioner control method and system, storage medium and air conditioner |
| CN111023441B (en) * | 2019-12-30 | 2021-08-24 | Tcl空调器(中山)有限公司 | Air conditioner control method and system, storage medium and air conditioner |
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