CN202502423U - Temperature control circuit used in DC-DC direct current converter - Google Patents
Temperature control circuit used in DC-DC direct current converter Download PDFInfo
- Publication number
- CN202502423U CN202502423U CN2012200267786U CN201220026778U CN202502423U CN 202502423 U CN202502423 U CN 202502423U CN 2012200267786 U CN2012200267786 U CN 2012200267786U CN 201220026778 U CN201220026778 U CN 201220026778U CN 202502423 U CN202502423 U CN 202502423U
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- CN
- China
- Prior art keywords
- direct current
- operational amplifier
- control circuit
- temperature
- temperature control
- Prior art date
- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a temperature control circuit used in a DC-DC direct current converter. The temperature control circuit used in the DC-DC direct current converter comprises a thermistor which is used for sensing temperature change of work environment. The thermistor is connected between a noninverting input terminal of an operational amplifier and an anode of a power supply. An inverting input terminal of the operational amplifier is provided with reference voltage. After a capacitor and a feedback resistor are connected in series, both the capacitor and the feedback resistor are connected between the inverting input terminal and an output terminal of the operational amplifier. A first divider resistor is connected between the noninverting input terminal of the operational amplifier and an earth connection point. The output terminal of the operational amplifier is connected with a cathode of a diode through one current-limiting resistor. An anode of the diode outputs control signals. The temperature control circuit used in the DC-DC direct current converter is advantaged in that casing temperature can be detected through the thermistor; the circuit starts work when the casing temperature arrives a set value; a duty ratio is reduced by controlling a PWM circuit to achieve a purpose of constant temperature by reducing output current, and thereby long-term use of the DC-DC direct current converter under high temperature can be realized.
Description
Technical field
The utility model relates to the DC-DC direct current transducer, refers more particularly to the temperature control circuit that is used for the DC-DC direct current transducer.
Background technology
Electric automobile is electric power system with the vehicle power, and generally its supplying cell voltage is up to hundreds of volts, comes to power supplies such as car load consumer such as CD player, headlamp, back car light, rain brush so need the DC-DC direct current transducer that hundreds of volt voltages are reduced to 12V or 24V.Along with the fast development of New-energy electric vehicle, the prospect of Vehicular DC-DC converter also a slice is good, also increasingly high to its requirement simultaneously.
DC-DC direct current transducer in the market has following two kinds: the ⑴ product does not have temperature protection; This product uses all right when environment temperature is not high; In case but the environment for use temperature when too high product will be extremely unreliable, being easy under too high temperature, to work because of electronic component causes damaging even thermal runaway.⑵ but product has temperature protection protects through temperature switch; Working temperature such as DC-DC converter in the summer car reaches more than 60 ℃ probably; When the outer casing of power supply temperature is crossed up to 85 ℃; The power supply no-output need be waited until when shell is cooled to 75 ℃ and just can start working, and this can cause and be cooled to 75 ℃ a very long time car load at shell and can't use.If at big greasy weather or night, car is parked under the situation in roadside, and the car auroral poles that can't turn on the light might cause the accident, and has brought serious potential safety hazard to trip.
The utility model content
In view of the defective that above-mentioned prior art exists, it is a kind of simple, reliable that the purpose of the utility model is to provide, the temperature control circuit that is used for the DC-DC direct current transducer that at high temperature can use for a long time.
For addressing the above problem, the utility model has adopted following technical scheme.
The temperature control circuit that is used for the DC-DC direct current transducer; Comprise: in order to the thermistor of induction operating ambient temperature variation; Thermistor is connected between the in-phase input end and positive source of operational amplifier, and the inverting input of operational amplifier is provided with reference voltage, electric capacity be linked between the inverting input and output terminal of operational amplifier after feedback resistance is connected; Be connected with first divider resistance between the in-phase input end of operational amplifier and the earth point; The output terminal of operational amplifier is connected with the negative pole of diode through a current-limiting resistance, and the positive pole of diode is exported control signal, goes to control the dutycycle of pwm circuit in the DC-DC direct current transducer.
Further; The aforesaid temperature control circuit that is used for the DC-DC direct current transducer; Wherein: said reference voltage is obtained by second divider resistance that is connected in series and the 3rd divider resistance dividing potential drop, and second divider resistance and the 3rd divider resistance are connected between the current sample point of positive source and DC-DC direct current transducer.
The beneficial effect of the utility model is: in the DC-DC direct current transducer, use the described temperature control circuit of the utility model; Can detect its skin temperature through thermistor; When skin temperature raises and during ANOMALOUS VARIATIONS, the output terminal output electronegative potential of operational amplifier, this electronegative potential remove to control pwm circuit in the DC-DC direct current transducer to reduce maximum duty cycle; Reach the purpose that reduces electric power outputting current; Thereby the output power of power supply is reduced, the skin temperature of DC-DC direct current transducer is effectively controlled, thereby can guarantee that the DC-DC direct current transducer can use for a long time.
Description of drawings
Fig. 1 is the schematic diagram of the temperature control circuit of the described DC-DC of the being used for direct current transducer of the utility model.
Embodiment
Below in conjunction with accompanying drawing the described temperature control circuit that is used for the DC-DC direct current transducer of the utility model is done further detailed explanation.
Referring to shown in Figure 1; The described temperature control circuit that is used for the DC-DC direct current transducer of the utility model; Comprise: in order to the thermistor RT of induction operating ambient temperature variation; Thermistor RT is connected between the in-phase input end and positive source VCC of operational amplifier; The inverting input of operational amplifier is provided with reference voltage, and said reference voltage is obtained by second divider resistance R1 that is connected in series and the 3rd divider resistance R2 dividing potential drop, and the second divider resistance R1 and the 3rd divider resistance R2 are connected between the current sample point of positive source VCC and DC-DC direct current transducer.Capacitor C 1 be linked between the inverting input and output terminal of operational amplifier after feedback resistance R3 connects; Be connected with the first divider resistance R4 between the in-phase input end of operational amplifier and the earth point; The output terminal of operational amplifier is connected with the negative pole of diode D1 through a current-limiting resistance R5; The positive pole of diode D1 is exported control signal, goes to control the dutycycle of pwm circuit in the DC-DC direct current transducer.
During work, thermistor RT is installed on the metal shell of DC-DC direct current transducer, in order to the temperature of induction shell; When the temperature of shell met or exceeded the value of setting, the resistance of thermistor RT also correspondingly increased to certain value, made the output terminal output electronegative potential of operational amplifier; This electronegative potential removes to control pwm circuit in the DC-DC direct current transducer to reduce maximum duty cycle, reaches the purpose that reduces electric power outputting current, thereby the output power of power supply is reduced; The skin temperature of DC-DC direct current transducer is effectively controlled, thereby can guarantees that the DC-DC direct current transducer can use for a long time.In real work, preferably select the thermistor of resistance linear change for use, like the thermistor of 5 ℃ of change in resistance 100 Ω of the every variation of temperature.
Claims (2)
1. the temperature control circuit that is used for the DC-DC direct current transducer; Comprise: in order to the thermistor of induction operating ambient temperature variation; It is characterized in that: thermistor is connected between the in-phase input end and positive source of operational amplifier; The inverting input of operational amplifier is provided with reference voltage, electric capacity be linked between the inverting input and output terminal of operational amplifier after feedback resistance is connected, be connected with first divider resistance between the in-phase input end of operational amplifier and the earth point; The output terminal of operational amplifier is connected with the negative pole of diode through a current-limiting resistance, the positive pole output control signal of diode.
2. the temperature control circuit that is used for the DC-DC direct current transducer according to claim 1; It is characterized in that: said reference voltage is obtained by second divider resistance that is connected in series and the 3rd divider resistance dividing potential drop, and second divider resistance and the 3rd divider resistance are connected between the current sample point of positive source and DC-DC direct current transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200267786U CN202502423U (en) | 2012-01-20 | 2012-01-20 | Temperature control circuit used in DC-DC direct current converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200267786U CN202502423U (en) | 2012-01-20 | 2012-01-20 | Temperature control circuit used in DC-DC direct current converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202502423U true CN202502423U (en) | 2012-10-24 |
Family
ID=47039033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200267786U Expired - Fee Related CN202502423U (en) | 2012-01-20 | 2012-01-20 | Temperature control circuit used in DC-DC direct current converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202502423U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102566628A (en) * | 2012-01-20 | 2012-07-11 | 张家港市华为电子有限公司 | Temperature control circuit in DC-DC (direct current) converter |
| CN117555369A (en) * | 2023-12-30 | 2024-02-13 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Temperature control system and method and electronic equipment |
-
2012
- 2012-01-20 CN CN2012200267786U patent/CN202502423U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102566628A (en) * | 2012-01-20 | 2012-07-11 | 张家港市华为电子有限公司 | Temperature control circuit in DC-DC (direct current) converter |
| CN102566628B (en) * | 2012-01-20 | 2014-04-09 | 张家港市华为电子有限公司 | Temperature control circuit in DC-DC (direct current) converter |
| CN117555369A (en) * | 2023-12-30 | 2024-02-13 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Temperature control system and method and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121024 Termination date: 20180120 |