CN218386791U - Temperature protection power supply circuit - Google Patents
Temperature protection power supply circuit Download PDFInfo
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- CN218386791U CN218386791U CN202222886771.8U CN202222886771U CN218386791U CN 218386791 U CN218386791 U CN 218386791U CN 202222886771 U CN202222886771 U CN 202222886771U CN 218386791 U CN218386791 U CN 218386791U
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- temperature protection
- power supply
- temperature
- protection module
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Abstract
The utility model relates to the technical field of switching power supplies, in particular to a temperature protection power supply circuit, which comprises a control chip U1 and a power switch tube Q1; the control chip U1 comprises a power supply port VIN, an enable port EN and an output port OUT; the output port OUT is connected with the base electrode of the power switch tube Q1; the temperature protection power supply circuit further comprises a first temperature protection module and a second temperature protection module. The utility model discloses a set up first temperature protection module and second temperature protection module, after one of them temperature protection module damages, can not influence other temperature protection module and normally work, can guarantee effectively to lead to the damage of electrical apparatus when the high temperature of electrical apparatus.
Description
Technical Field
The utility model relates to a switching power supply technical field, concretely relates to temperature protection power supply circuit.
Background
With the rapid development of electronic technology, the relationship between power electronic equipment and people's work and life is increasingly close, then all power electronic equipment are not away from the use of switching power supply, because the function of present power electronic equipment is more, lead to the inside heating element of power electronic equipment also more, when the live time is overlength, the holding leads to power electronic equipment to damage because of the high temperature, in order to prevent above-mentioned condition from taking place, generally set up the temperature protection module in switching power supply at present.
Most of the temperature protection modules of the conventional switching power supply adopt a single-layer protection mode, and a temperature control switch or a thermistor is adopted for switching on and off the circuit, so that when the temperature protection module fails, the power electronic equipment is easily damaged.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a temperature protection power supply circuit to the above-mentioned not enough among the prior art.
The purpose of the utility model is realized through the following technical scheme: a temperature protection power supply circuit comprises a control chip U1 and a power switch tube Q1; the control chip U1 comprises a power supply port VIN, an enable port EN and an output port OUT; the output port OUT is connected with the base electrode of the power switch tube Q1; the temperature protection power supply circuit also comprises a first temperature protection module and a second temperature protection module;
the first temperature protection module comprises a first auxiliary source, a comparison component, a switch tube Q2 and a thermistor RX; the first auxiliary source is used for supplying power to the first temperature protection module; the comparison component outputs a signal to the control end of the switching tube Q2 according to the thermistor RX; the switch end of the switch tube Q2 is connected with an enable port EN of the control chip U1;
the second temperature protection module comprises a second auxiliary source and a temperature control switch; the second auxiliary source is connected with a power supply port VIN of the control chip U1; the second auxiliary source is grounded through the temperature control switch.
The utility model is further arranged that the comparison component comprises a divider resistor R2, a comparison resistor R3, a comparison resistor R4 and an operational amplifier U2;
one end of the divider resistor R2 is connected with a first auxiliary source; the other end of the divider resistor R2 is grounded through a thermistor RX; the other end of the divider resistor R2 is connected with the negative input end of the operational amplifier U2; one end of the divider resistor R3 is connected with a first auxiliary source; the other end of the divider resistor R3 is grounded through a comparison resistor R4; the other end of the divider resistor R3 is connected with the positive input end of the operational amplifier U2; and the output end of the operational amplifier U2 is connected with the control end of the switching tube Q2.
The utility model is further arranged in that the first temperature protection module further comprises a resistor R5 and a resistor R6;
one end of the resistor R5 is connected with the output end of the operational amplifier U2; the other end of the resistor R5 is connected with the base electrode of the switching tube Q2; one end of the resistor R5 is connected with a first auxiliary source; the other end of the resistor R5 is connected with the collector electrode of the switch tube Q2; the emitting electrode of the switching tube Q2 is grounded; and the collector electrode of the switching tube Q2 is connected with an enable port EN of the control chip U1.
The utility model is further configured that the second temperature protection module further comprises a current limiting resistor R1; one end of the current limiting resistor R1 is connected with a second auxiliary source; the other end of the current-limiting resistor R1 is connected with the temperature control switch and a power supply port VIN of the control chip U1 respectively.
The utility model discloses further set up to, be equipped with diode D1 between current-limiting resistor R1's the other end and control chip U1's the power mouth VIN.
The utility model discloses set up as further, thermistor RX is negative temperature coefficient thermistor.
The utility model has the advantages that: the utility model discloses a set up first temperature protection module and second temperature protection module, after one of them temperature protection module damages, can not influence other temperature protection module and normally work, can guarantee effectively to lead to the damage of electrical apparatus when the high temperature of electrical apparatus.
Drawings
The invention is further described with the aid of the accompanying drawings, in which the embodiments do not constitute any limitation to the invention, and for a person skilled in the art, without inventive step, other figures can be derived from the following figures.
Fig. 1 is a schematic circuit diagram of the present invention;
wherein: 1. a first auxiliary source; 2. a second auxiliary source; 3. a temperature control switch.
Detailed Description
The invention will be further described with reference to the following examples.
As shown in fig. 1, the temperature protection power circuit of the present embodiment includes a control chip U1 and a power switch Q1; the control chip U1 comprises a power supply port VIN, an enable port EN and an output port OUT; the output port OUT is connected with a base electrode of the power switch tube Q1; the temperature protection power supply circuit also comprises a first temperature protection module and a second temperature protection module;
the first temperature protection module comprises a first auxiliary source 1, a comparison component, a switching tube Q2 and a thermistor RX; the first auxiliary source 1 is used for supplying power to a first temperature protection module; the comparison component outputs a signal to the control end of the switch tube Q2 according to the thermistor RX; the switch end of the switch tube Q2 is connected with an enable port EN of the control chip U1;
the second temperature protection module comprises a second auxiliary source 2 and a temperature control switch 3; the second auxiliary source 2 is connected with a power supply port VIN of the control chip U1; the second auxiliary source 2 is grounded through a temperature controlled switch 3.
Specifically, in the temperature protection power supply circuit of this embodiment, by simultaneously providing the first temperature protection module and the second temperature protection module, when the temperature of the electrical appliance is too high, the resistance value of the thermistor RX changes, so that the comparison module outputs a high level to the switching tube Q2, and after the switching tube Q2 is closed, the enable port EN of the control chip U1 obtains a low level, so that the control chip U1 stops working; meanwhile, when the temperature of the electric appliance is too high, the temperature control switch 3 is switched on, so that the second auxiliary source 2 is directly grounded through the temperature control switch 3, the power supply port VIN of the control chip U1 loses voltage, the control PWM wave is not output any more, the power switch tube Q1 does not work, and the power supply does not output power.
This embodiment is through setting up first temperature protection module and second temperature protection module, after one of them temperature protection module damages, can not influence other temperature protection module and normally work, can guarantee effectively that the damage that leads to electrical apparatus when the high temperature of electrical apparatus.
In the temperature protection power supply circuit of this embodiment, the comparison component includes a voltage dividing resistor R2, a comparison resistor R3, a comparison resistor R4, and an operational amplifier U2;
one end of the divider resistor R2 is connected with the first auxiliary source 1; the other end of the divider resistor R2 is grounded through a thermistor RX; the other end of the divider resistor R2 is connected with the negative input end of the operational amplifier U2; one end of the divider resistor R3 is connected with the first auxiliary source 1; the other end of the divider resistor R3 is grounded through a comparison resistor R4; the other end of the divider resistor R3 is connected with the positive input end of the operational amplifier U2; and the output end of the operational amplifier U2 is connected with the control end of the switching tube Q2.
Specifically, when normal, the voltage of the positive input end of the operational amplifier U2 is less than the voltage of the negative input end of the operational amplifier U2, and at this time, the operational amplifier U2 outputs a low level, so that the switching tube Q2 is disconnected, and at this time, the enable port EN of the control chip U1 obtains a high level to normally work.
When the temperature is too high, the resistance of the thermistor RX is reduced, the voltage at the positive input end of the operational amplifier U2 is greater than the voltage at the negative input end of the operational amplifier U2, and at this time, the operational amplifier U2 outputs a high level, so that the switch tube Q2 is switched on, and at this time, the enable port EN of the control chip U1 obtains a low level to stop working.
In the temperature protection power supply circuit of this embodiment, the first temperature protection module further includes a resistor R5 and a resistor R6;
one end of the resistor R5 is connected with the output end of the operational amplifier U2; the other end of the resistor R5 is connected with the base electrode of the switch tube Q2; one end of the resistor R5 is connected with the first auxiliary source 1; the other end of the resistor R5 is connected with the collector electrode of the switch tube Q2; the emitting electrode of the switching tube Q2 is grounded; and the collector electrode of the switching tube Q2 is connected with an enable port EN of the control chip U1.
In the temperature protection power circuit of this embodiment, the second temperature protection module further includes a current-limiting resistor R1; one end of the current limiting resistor R1 is connected with a second auxiliary source 2; the other end of the current-limiting resistor R1 is respectively connected with the temperature control switch 3 and a power supply port VIN of the control chip U1. The current limiting function is achieved through the arrangement.
In the temperature protection power supply circuit of this embodiment, a diode D1 is disposed between the other end of the current-limiting resistor R1 and the power supply VIN of the control chip U1. The backflow prevention function is achieved through the arrangement.
In the temperature protection power supply circuit described in this embodiment, the thermistor RX is a negative temperature coefficient thermistor. The cost is low through the arrangement.
It should be finally noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit the scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. A temperature protection power supply circuit characterized by: the power switch comprises a control chip U1 and a power switch tube Q1; the control chip U1 comprises a power supply port VIN, an enable port EN and an output port OUT; the output port OUT is connected with a base electrode of the power switch tube Q1; the temperature protection power supply circuit also comprises a first temperature protection module and a second temperature protection module;
the first temperature protection module comprises a first auxiliary source (1), a comparison component, a switching tube Q2 and a thermistor RX; the first auxiliary source (1) is used for supplying power to the first temperature protection module; the comparison component outputs a signal to the control end of the switching tube Q2 according to the thermistor RX; the switch end of the switch tube Q2 is connected with an enable port EN of the control chip U1;
the second temperature protection module comprises a second auxiliary source (2) and a temperature control switch (3); the second auxiliary source (2) is connected with a power supply port VIN of the control chip U1; the second auxiliary source (2) is grounded through the temperature control switch (3).
2. A temperature protection power supply circuit according to claim 1, wherein: the comparison component comprises a divider resistor R2, a comparison resistor R3, a comparison resistor R4 and an operational amplifier U2;
one end of the divider resistor R2 is connected with a first auxiliary source (1); the other end of the divider resistor R2 is grounded through a thermistor RX; the other end of the divider resistor R2 is connected with the negative input end of the operational amplifier U2; one end of the divider resistor R3 is connected with a first auxiliary source (1); the other end of the divider resistor R3 is grounded through a comparison resistor R4; the other end of the divider resistor R3 is connected with the positive input end of the operational amplifier U2; and the output end of the operational amplifier U2 is connected with the control end of the switching tube Q2.
3. A temperature protection power supply circuit according to claim 2, wherein: the first temperature protection module further comprises a resistor R5 and a resistor R6;
one end of the resistor R5 is connected with the output end of the operational amplifier U2; the other end of the resistor R5 is connected with the base electrode of the switch tube Q2; one end of the resistor R5 is connected with a first auxiliary source (1); the other end of the resistor R5 is connected with the collector of the switching tube Q2; the emitting electrode of the switching tube Q2 is grounded; and the collector electrode of the switching tube Q2 is connected with an enable port EN of the control chip U1.
4. A temperature protected power supply circuit as claimed in claim 1, wherein: the second temperature protection module further comprises a current limiting resistor R1; one end of the current limiting resistor R1 is connected with a second auxiliary source (2); the other end of the current-limiting resistor R1 is respectively connected with the temperature control switch (3) and a power supply port VIN of the control chip U1.
5. The temperature-protected power supply circuit of claim 4, wherein: and a diode D1 is arranged between the other end of the current-limiting resistor R1 and a power supply port VIN of the control chip U1.
6. A temperature protected power supply circuit as claimed in claim 2, wherein: the thermistor RX is a negative temperature coefficient thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222886771.8U CN218386791U (en) | 2022-10-28 | 2022-10-28 | Temperature protection power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222886771.8U CN218386791U (en) | 2022-10-28 | 2022-10-28 | Temperature protection power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218386791U true CN218386791U (en) | 2023-01-24 |
Family
ID=84936186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222886771.8U Active CN218386791U (en) | 2022-10-28 | 2022-10-28 | Temperature protection power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218386791U (en) |
-
2022
- 2022-10-28 CN CN202222886771.8U patent/CN218386791U/en active Active
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