CN215071621U - Direct current power supply overheating protection circuit - Google Patents
Direct current power supply overheating protection circuit Download PDFInfo
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- CN215071621U CN215071621U CN202121278228.9U CN202121278228U CN215071621U CN 215071621 U CN215071621 U CN 215071621U CN 202121278228 U CN202121278228 U CN 202121278228U CN 215071621 U CN215071621 U CN 215071621U
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- protection circuit
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- overheat protection
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Abstract
This patent belongs to the electricity field, concretely relates to DC power supply overheat protection circuit. The design of dc power supplies requires not only the use of electronic components with good high temperature characteristics, but also rational design and advanced printed PCB and heat sink production processes and the incorporation of over-temperature protection circuits. The device comprises a temperature relay, an auxiliary power supply VCC, a current-limiting resistor R1 and an execution circuit; the executive circuit is connected with a temperature relay KT1 through a resistor R1; the temperature relay KT1 is connected with an auxiliary power supply VCC, a current-limiting resistor R1 and a filter capacitor C1 are connected in parallel to form an RC filter circuit, and the filter capacitor C1 is grounded. The invention provides a flexible circuit capable of reliably finishing the overheat protection function aiming at a direct current power supply.
Description
Technical Field
This patent belongs to the electricity field, concretely relates to DC power supply overheat protection circuit.
Background
In a direct current power supply, the power density in a unit volume of a switching regulator is greatly improved due to high integration, light weight and small volume of the switching regulator, so that if the temperature requirement of components in a power supply device on the working environment is not correspondingly improved, the circuit performance is inevitably deteriorated, and the components fail prematurely. Therefore, an overheat protection circuit should be provided in the high-power dc power supply.
The design of dc power supplies requires not only the use of electronic components with good high temperature characteristics, but also rational design and advanced printed PCB and heat sink production processes and the incorporation of over-temperature protection circuits. The invention provides a method for realizing a direct-current power supply overheating protection circuit, which aims to prevent a power device in a direct-current power supply from being damaged due to overheating.
The invention belongs to an overheating protection circuit of a direct current power supply (AC-DC, DC-DC), and particularly relates to an overheating protection circuit which is suitable for being installed on a direct current power supply radiator and aims at main heating devices (a power MOS (metal oxide semiconductor) tube and a power diode) of the direct current power supply, and the overheating protection circuit can prevent the direct current power supply from being damaged due to overheating.
Disclosure of Invention
The invention aims to provide a flexible circuit capable of reliably finishing an overheat protection function aiming at a direct-current power supply.
A direct current power supply overheating protection circuit comprises a temperature relay, an auxiliary power supply VCC, a current limiting resistor R1 and an execution circuit; the executive circuit is connected with a temperature relay KT1 through a resistor R1; the temperature relay KT1 is connected with an auxiliary power supply VCC, a current-limiting resistor R1 and a filter capacitor C1 are connected in parallel to form an RC filter circuit, and the filter capacitor C1 is grounded.
The temperature sensing surface of the temperature relay KT1 is tightly attached to the surface of the radiator, and heat-conducting silicone grease is smeared between the temperature relay KT1 and the radiator or a heat-conducting insulating sheet is installed.
The auxiliary power source VCC is not more than 15V.
The selection of the resistance value of the current-limiting resistor needs to be larger than the calculated value, and the calculation of the current-limiting resistor is shown in a formula (1):
R＝UVCC/IKT1………………………(1)
in formula (1):
UVCCto auxiliary supply voltage
IKT1-current of the relay to meet derating requirements.
The filter capacitor C1 is located on the printed board in close proximity to the actuator circuit.
Compared with the prior art, the invention has the advantages that: the anti-interference capability is strong, the circuit structure is simple, the performance is stable, the realization is easy, and the working reliability is high.
Drawings
Fig. 1 is a schematic diagram of an overheat protection circuit for a dc power supply according to the present invention.
Detailed Description
The dc power supply overheat protection circuit according to the present invention will be described in further detail with reference to the accompanying drawings.
The invention relates to a method for realizing an overheat protection circuit of a direct-current power supply, which is used for ensuring that main heating power devices of the direct-current power supply are not damaged due to overheat. As shown in fig. 1, KT1 is a temperature relay, and when the temperature value reached the temperature of the temperature relay, the temperature relay acted, the normally open contact was closed, and the auxiliary power VCC sent the protection signal (PROTECT) to the execution circuit through temperature switch KT1 to realize overheat protection. In the figure, C1 is a filter capacitor, R1 is used for limiting the current flowing through the contacts of the temperature relay and forms an RC filter circuit together with C1.
The direct current power supply overheat protection circuit includes:
the temperature control circuit comprises a temperature relay, an auxiliary power supply, a current-limiting resistor, a filter capacitor and an execution circuit.
The temperature relay and the tested device are required to be arranged on the same radiator and abut against the tested device, so that the relay can be guaranteed to play a role in overheat protection. When the temperature relay is installed, the temperature sensing surface of the relay is required to be tightly attached to the surface of the radiator, a gap is not required to be formed, and heat-conducting silicone grease is required to be coated between the temperature relay and the radiator or a heat-conducting insulating sheet is required to be installed to ensure reliable heat transfer.
The requirement of the auxiliary power supply does not exceed 15V, and the specific value is determined according to the selected temperature relay parameters and related circuits, so that the protection signal can not exceed the required voltage of the execution circuit device.
The current-limiting resistor is determined according to the temperature relay parameters and a specific implementation circuit, the current-limiting resistor is calculated according to a formula (1), and the resistance value selection of the resistor needs to be larger than the calculated value.
R＝UVCC/IKT1………………………(1)
In formula (1):
UVCC-as auxiliary power supply in figure 1
IKT1For the current to pass through the relay, the derating requirements of the relay need to be met
The filter capacitor is arranged on the printed board and is close to the execution circuit in order to improve the filtering effect, and the capacity can be increased properly if the circuit interference is large. In addition, whether to increase the discharge resistance is considered in conjunction with the execution circuit.
Claims (5)
1. A direct current power supply overheat protection circuit is characterized in that: the device comprises a temperature relay, an auxiliary power supply VCC, a current limiting resistor R1 and an execution circuit; the executive circuit is connected with a temperature relay KT1 through a resistor R1; the temperature relay KT1 is connected with an auxiliary power supply VCC, a current-limiting resistor R1 and a filter capacitor C1 are connected in parallel to form an RC filter circuit, and the filter capacitor C1 is grounded.
2. The direct current power supply overheat protection circuit according to claim 1, wherein: the temperature sensing surface of the temperature relay KT1 is tightly attached to the surface of the radiator, and heat-conducting silicone grease is smeared between the temperature relay KT1 and the radiator or a heat-conducting insulating sheet is installed.
3. The direct current power supply overheat protection circuit according to claim 1, wherein: the auxiliary power source VCC is not more than 15V.
4. The direct current power supply overheat protection circuit according to claim 1, wherein: the selection of the resistance value of the current-limiting resistor needs to be larger than the calculated value, and the calculation of the current-limiting resistor is shown in a formula (1):
R＝UVCC/IKT1………………………(1)
in formula (1):
UVCCto auxiliary supply voltage
IKT1-current of the relay to meet derating requirements.
5. The direct current power supply overheat protection circuit according to claim 1, wherein: the filter capacitor C1 is located on the printed board in close proximity to the actuator circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121278228.9U CN215071621U (en) | 2021-06-08 | 2021-06-08 | Direct current power supply overheating protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121278228.9U CN215071621U (en) | 2021-06-08 | 2021-06-08 | Direct current power supply overheating protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215071621U true CN215071621U (en) | 2021-12-07 |
Family
ID=79204783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121278228.9U Active CN215071621U (en) | 2021-06-08 | 2021-06-08 | Direct current power supply overheating protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215071621U (en) |
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2021
- 2021-06-08 CN CN202121278228.9U patent/CN215071621U/en active Active
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