CN208796131U - A kind of Simple constant-temperature control circuit - Google Patents
A kind of Simple constant-temperature control circuit Download PDFInfo
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- CN208796131U CN208796131U CN201821471857.1U CN201821471857U CN208796131U CN 208796131 U CN208796131 U CN 208796131U CN 201821471857 U CN201821471857 U CN 201821471857U CN 208796131 U CN208796131 U CN 208796131U
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Abstract
The utility model discloses a kind of Simple constant-temperature control circuits, including main control chip, battery circuit, PWM output circuit, detection circuit and heating wire load circuit, the main control chip includes Voltage Feedback pin, Voltage Feedback pin ground terminal and pwm signal output pin, the PWM output circuit includes the first metal-oxide-semiconductor, first resistor and second resistance, the grid of first metal-oxide-semiconductor is connected separately with one end of first resistor and second resistance, the source electrode of second resistance and the first metal-oxide-semiconductor is connect with the cathode of battery circuit respectively, the drain electrode of first metal-oxide-semiconductor is connect with one end of heating wire load circuit, the other end of heating wire load circuit and the anode of battery circuit connect, the detection circuit includes the 6th thermistor and the 7th resistance connecting with the anode of battery circuit.Simple constant-temperature control circuit disclosed by the utility model, circuit structure is simple, by the control of heating wire load circuit temperature within the scope of a safety.
Description
Technical field
The utility model relates to appliance circuit, in particular to a kind of Simple constant-temperature control circuit.
Background technique
Heating wire load component as a kind of heater element on many heat generating devices using relatively broad, for example, hair
Heated filament load component can be on heater, to be that user warms oneself under the lower environment of temperature.For with heating wire
Electric equipment products, due to the case where being easy to cause product high temperature exothermic in the uncontrollable situation of heating wire, be easy to appear burning machine.Needle
To the deficiencies in the prior art, it is necessary to propose new solution.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of Simple constant-temperature control circuits, and circuit structure is simple, will
Heating wire load circuit temperature controls within the scope of a safety.
In order to solve the above-mentioned technical problem, the technical solution of the utility model are as follows:
A kind of Simple constant-temperature control circuit, including main control chip, battery circuit, PWM output circuit, detection circuit and fever
Silk load circuit, the main control chip includes Voltage Feedback pin, Voltage Feedback pin ground terminal and pwm signal output pin,
The PWM output circuit includes the first metal-oxide-semiconductor, first resistor and second resistance, and the grid of the first metal-oxide-semiconductor is connected separately with first
The source electrode of one end of resistance and second resistance, second resistance and the first metal-oxide-semiconductor is connect with the cathode of battery circuit respectively, and first
The drain electrode of metal-oxide-semiconductor is connect with one end of heating wire load circuit, the other end of heating wire load circuit and the anode of battery circuit
Connection, the detection circuit include the 6th thermistor and the 7th resistance connecting with the anode of battery circuit, the 6th heat
Quick resistance is arranged near heating wire load circuit, and one end of the 7th resistance connect with the 6th resistance, the other end and Voltage Feedback
The connection of pin ground terminal, the test point between the 6th resistance and the 7th resistance are connect with Voltage Feedback pin.
Further, the main control chip includes key control interface, and key control interface is connected with the one of key circuit
End, the other end of key circuit and the cathode of battery circuit connect.
Further, the PWM output circuit is at least two-way.
Further, first metal-oxide-semiconductor is N-channel MOS pipe.
By adopting the above technical scheme, PWM duty cycle is exported by control pwm signal output pin to lead to due to main control chip
The energization of PWM output circuit control heating wire load circuit is crossed, electric current can reach heating shape by heating wire load circuit
State.To prevent heating wire load circuit heating temperature excessively high, lead to generate safety issue, thus by the 6th thermistor with
The partial pressure of 7th resistance controls.When product work, low level is set by Voltage Feedback pin ground terminal, is equivalent to connection
To ground.Due to the attribute of thermistor, when the variation of thermistor ambient temperature, the resistance value of thermistor will become
Change, and changing value is quite stable, therefore need to be by thermistor close to pyrotoxin, i.e. position near heating wire load circuit.?
Heating wire load circuit works, by the way that a fixed ratio, the ratio will be had under the partial pressure of thermistor R6 and resistance R7
It is equal to the ratio of FB pin voltage and cell voltage.Therefore the duty ratio of adjustable PWM keeps the temperature of heating wire
In a fixed value.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
Specific embodiment of the present utility model is described further with reference to the accompanying drawing.It should be noted that
The explanation of these embodiments is used to help to understand the utility model, but does not constitute the restriction to the utility model.This
Outside, technical characteristic involved in the various embodiments of the present invention described below is as long as they do not conflict with each other
It can be combined with each other.
As shown in Figure 1, the utility model discloses a kind of Simple constant-temperature control circuit, including main control chip MCU, battery electricity
Road 1, PWM output circuit 2, detection circuit 3 and heating wire load circuit 4, main control chip MCU include Voltage Feedback pin FB, electricity
Press feedback pin FB ground terminal and pwm signal output pin, PWM output circuit 2 include the first metal-oxide-semiconductor Q1, first resistor R1 and
The grid of second resistance R2, the first metal-oxide-semiconductor Q1 are connected separately with one end of first resistor R1 and second resistance R2, second resistance R2
And first the source electrode of metal-oxide-semiconductor Q1 connect respectively with the cathode of battery circuit 1, the drain electrode of the first metal-oxide-semiconductor Q1 and heating wire load electricity
The one end on road 4 connects, and the other end of heating wire load circuit 4 is connect with the anode of battery circuit 1, and detection circuit 3 includes and electricity
The 6th thermistor R6 and the 7th resistance R7 of the anode connection of pond circuit 1, the 6th thermistor R6 setting are loaded in heating wire
Near circuit 4, one end of the 7th resistance R7 is connect with the 6th thermistor R6, the other end and Voltage Feedback pin FB ground terminal connect
It connects, the test point between the 6th resistance and the 7th resistance R7 is connect with Voltage Feedback pin FB, and the first metal-oxide-semiconductor Q1 is N-channel MOS
Pipe.Since main control chip MCU exports PWM duty cycle by control pwm signal output pin come by the control of PWM output circuit 2
The energization of heating wire load circuit 4, electric current can reach heated condition by heating wire load circuit 4.To prevent heating wire negative
It is excessively high to carry 4 heating temperature of circuit, causes to generate safety issue, therefore point for passing through the 6th thermistor R6 and the 7th resistance R7
Pressure is to control.When product work, low level is set by Voltage Feedback pin FB ground terminal, is equivalent to and is connected to ground.Due to
The attribute of thermistor, when the variation of thermistor ambient temperature, the resistance value of thermistor will change, and changing value
It is quite stable, therefore need to be by thermistor close to pyrotoxin, i.e. position near heating wire load circuit 4.It is loaded in heating wire
Circuit 4 works, and by that will have a fixed ratio under the partial pressure of thermistor R6 and resistance R7, which draws equal to FB
The ratio of foot voltage and cell voltage.Therefore the temperature of heating wire is maintained at a fixation by the duty ratio of adjustable PWM
Value.
In addition, main control chip MCU includes key control interface KEY, key control interface KEY is connected with key circuit 5
The other end of one end, key circuit 5 is connect with the cathode of battery circuit 1, convenient for users to being passed through by user by key control
Circuit.PWM output circuit 2 is at least two-way, facilitates control multichannel heating wire load circuit 4.
The embodiments of the present invention is explained in detail in conjunction with attached drawing above, but the utility model is not limited to be retouched
The embodiment stated.For a person skilled in the art, right in the case where not departing from the utility model principle and spirit
These embodiments carry out a variety of change, modification, replacement and modification, still fall in the protection scope of the utility model.
Claims (4)
1. a kind of Simple constant-temperature control circuit, it is characterised in that: including main control chip, battery circuit, PWM output circuit, detection
Circuit and heating wire load circuit, the main control chip include Voltage Feedback pin, Voltage Feedback pin ground terminal and pwm signal
Output pin, the PWM output circuit include the first metal-oxide-semiconductor, first resistor and second resistance, and the grid of the first metal-oxide-semiconductor is distinguished
Be connected with one end of first resistor and second resistance, the source electrode of second resistance and the first metal-oxide-semiconductor respectively with the cathode of battery circuit
Connection, the drain electrode of the first metal-oxide-semiconductor are connect with one end of heating wire load circuit, the other end and the battery electricity of heating wire load circuit
The anode connection on road, the detection circuit include the 6th thermistor and the 7th resistance connecting with the anode of battery circuit, institute
The 6th thermistor is stated to be arranged near heating wire load circuit, one end of the 7th resistance connect with the 6th resistance, the other end and
The connection of Voltage Feedback pin ground terminal, the test point between the 6th resistance and the 7th resistance are connect with Voltage Feedback pin.
2. Simple constant-temperature control circuit according to claim 1, it is characterised in that: the main control chip includes pressing key control
Interface, key control interface are connected with one end of key circuit, and the other end of key circuit and the cathode of battery circuit connect.
3. Simple constant-temperature control circuit according to claim 1, it is characterised in that: the PWM output circuit is at least two
Road.
4. Simple constant-temperature control circuit according to claim 1, it is characterised in that: first metal-oxide-semiconductor is N-channel MOS
Pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821471857.1U CN208796131U (en) | 2018-09-07 | 2018-09-07 | A kind of Simple constant-temperature control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821471857.1U CN208796131U (en) | 2018-09-07 | 2018-09-07 | A kind of Simple constant-temperature control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208796131U true CN208796131U (en) | 2019-04-26 |
Family
ID=66208993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821471857.1U Active CN208796131U (en) | 2018-09-07 | 2018-09-07 | A kind of Simple constant-temperature control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208796131U (en) |
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2018
- 2018-09-07 CN CN201821471857.1U patent/CN208796131U/en active Active
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Legal Events
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221230 Address after: 529000 Room 203, Floor 2, Building 1, No. 21, Jintong Road, Tangxia Town, Pengjiang District, Jiangmen City, Guangdong Province Patentee after: Jiangmen Xiaosong Intelligent Technology Co.,Ltd. Address before: 529085 301, Floor 3, Building 2, No. 21, Jintong Road, Tangxia Town, Pengjiang District, Jiangmen City, Guangdong Province Patentee before: JIANGMEN PENGJIANG DISTRICT JINYING TECHNOLOGY Co.,Ltd. |