CN112688277B - Switching power supply overcurrent protection detection device and switching power supply - Google Patents
Switching power supply overcurrent protection detection device and switching power supply Download PDFInfo
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- CN112688277B CN112688277B CN202110024055.6A CN202110024055A CN112688277B CN 112688277 B CN112688277 B CN 112688277B CN 202110024055 A CN202110024055 A CN 202110024055A CN 112688277 B CN112688277 B CN 112688277B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a switching power supply overcurrent protection detection device and a switching power supply, wherein one end of the overcurrent protection device is connected with the output end of a switching power supply drive control module, and the other end of the overcurrent protection device is connected with the switching power supply; controlling the output of the switching power supply within a rated power range through an overcurrent protection device; the overcurrent protection device comprises an RC low-pass filter, a constant current circuit, a constant voltage circuit, a PNP transistor Q3 and an NPN transistor Q4. The switch power supply comprises a switch power supply drive control module, a switch power supply and a switch power supply over-current protection detection device, wherein the switch power supply drive control module is connected with the switch power supply over-current protection detection device, the switch power supply over-current protection detection device is connected with the switch power supply, and the switch power supply over-current protection detection device is also connected with the switch power supply drive control module. The invention can ensure the stable and reliable work of the switching power supply, prolong the service life, reduce the after-sale maintenance cost and bring great economic benefit to enterprises.
Description
Technical Field
The invention relates to the technical field of protection circuits, in particular to a switching power supply overcurrent protection detection device and a switching power supply.
Background
The switch power supply overcurrent protection detection device is often exposed to excess belt load and voltage output short circuit in the using process to cause overlarge current, and plays a role in protection. For example: when the power output is connected with a load with 1000W/40V power rating (PO), such as 2000W/40V Power (PO), and the current is 50A which exceeds the rated power of the switching power supply, the switching power supply can hardly bear the maximum output current of 25A.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide the switch power supply overcurrent protection detection device and the switch power supply.
The invention is realized by the following technical scheme:
one end of the over-current protection device is connected with the output end of a switch power supply drive control module, and the other end of the over-current protection device is connected with a switch power supply; controlling the output of the switching power supply within a rated power range through the overcurrent protection device;
the overcurrent protection device comprises an RC low-pass filter, a constant current circuit, a constant voltage circuit, a PNP transistor Q3 and an NPN transistor Q4, wherein the RC low-pass filter is connected with the constant current circuit, the constant current circuit is connected with the constant voltage circuit, the constant voltage circuit is connected with an emitter of the PNP transistor Q3, a collector of the PNP transistor Q3 is connected with a base of the NPN transistor Q4, and a base of the PNP transistor Q3 is connected with a common end of the constant current circuit and the constant voltage circuit; the emitter of the NPN transistor Q4 is grounded, the collector of the NPN transistor Q4 is connected to the switching power supply, and the collector of the NPN transistor Q4 is further connected to the switching power supply drive control module.
As a further preferred scheme, the constant current circuit adopts an NPN bipolar transistor, the NPN bipolar transistor includes a transistor Q1 and a transistor Q2, the transistor Q1 and the transistor Q2 both adopt NPN type transistors, and each parameter requirement of the transistor Q1 and the transistor Q2 is consistent;
the base electrode of the triode Q1 is connected with the base electrode of the triode Q2, the collector electrode of the triode Q1 is connected with the common end of the triode Q1 and the triode Q2, and the emitter electrode of the triode Q1 is connected with the output end of the RC low-pass filter;
and an emitting electrode of the triode Q2 is connected with the output end of the RC low-pass filter, and a collecting electrode of the triode Q2 is connected with the input end of the constant-voltage circuit.
As a further preferable scheme, the RC low-pass filter includes a sampling resistor R3, a current-limiting resistor circuit, and a filter capacitor C1, the current-limiting resistor circuit includes a current-limiting resistor R1 and a current-limiting resistor R2, one end of the sampling resistor R3 is connected to the output end of the switching power supply drive control module, and the other end of the sampling resistor R3 is grounded;
one end of the current limiting resistor R1 is connected with the output end of the switching power supply drive control module and the common end of the sampling resistor R3, and the other end of the current limiting resistor R1 is connected with the emitting electrode of the triode Q1; one end of the current-limiting resistor R2 is grounded, and the other end of the current-limiting resistor R2 is connected with an emitting electrode of the triode Q2;
one end of the filter capacitor C1 is connected with the common end of the current-limiting resistor R1 and the emitting electrode of the triode Q1, and the other end of the filter capacitor C1 is grounded.
As a further preferred scheme, the constant voltage circuit adopts a PNP double transistor, the PNP double transistor includes a triode Q5 and a triode Q6, the triode Q5 and the triode Q6 both adopt PNP transistors, and the requirements of each parameter of the triode Q5 and the triode Q6 are the same;
the collector of the triode Q5 is connected with the collector of the triode Q1, the base of the triode Q5 is connected with the base of the triode Q6, and the emitter of the triode Q5 is connected with the emitter of the PNP transistor Q3; the collector of the triode Q5 is also connected with the common end of the base of the triode Q5 and the base of the triode Q6;
the collector of the triode Q6 is connected with the collector of the triode Q2, the emitter of the triode Q6 is connected with the common end of the emitter of the triode Q5 and the emitter of the PNP transistor Q3, and the emitter of the triode Q6 is also connected with the switching power supply; and the collector electrode of the triode Q6 is also connected with the base electrode of the PNP transistor Q3.
As a further preferable scheme, the current limiting device further comprises a current limiting resistor R4, one end of the current limiting resistor R4 is connected to the collector of the triode Q1, and the other end is connected to the collector of the triode Q5.
As a further preferable scheme, the sampling resistor R3 is a current sensing resistor.
As a further preferable scheme, the current-limiting voltage-dividing circuit further comprises a current-limiting voltage-dividing resistor R5, a current-limiting resistor R6, a voltage-dividing resistor R7 and a pull-up resistor R8, wherein one end of the current-limiting resistor R6 is connected with the collector of the PNP transistor Q3, and the other end of the current-limiting resistor R6 is connected with the base of the NPN transistor Q4; one end of the current-limiting bleeder resistor R5 is connected with an emitting electrode of the triode Q2, and the other end of the current-limiting bleeder resistor R5 is connected with a collector electrode of the PNP transistor Q3 and the common end of the current-limiting resistor R6; one end of the divider resistor R7 is connected with the common end of the current limiting resistor R6 and the base electrode of the NPN transistor Q4, and the other end of the divider resistor R7 is grounded;
one end of the pull-up resistor R8 is connected with the switching power supply, and the other end of the pull-up resistor R8 is connected with the collector of the NPN transistor Q4.
On the other hand, the invention also provides a switching power supply which comprises a switching power supply driving control module and the switching power supply overcurrent protection detection device, wherein the switching power supply driving control module is connected with the switching power supply overcurrent protection detection device.
The switching power supply driving control module is used for amplifying voltage and current of the driver so as to achieve the purpose of power supply power; the switch power supply overcurrent protection detection device is used for forming voltage and current output by excess load or outputting short circuit to cause overlarge current, and plays a role in protection.
As a further preferable scheme, the switching power supply driving control module includes a driver U5, a HO pin of the driver U5 is connected to a switching tube T1 through a diode D5, an LO pin of the driver U5 is connected to a switching tube T2 through a diode D7, the switching tube T1 is connected to the switching tube T2, and an output end of the switching tube T2 is connected to an input end (a sampling resistor R3) of the switching power supply overcurrent protection detection apparatus; the CT pin of the driver U5 is connected with the output end (the collector electrode of an NPN transistor Q4) of the overcurrent protection detection device of the switching power supply; and the CT pin of the driver U5 is grounded through an NPN transistor Q4.
As a further preferable scheme, the driver U5 has a model number of IR2153.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the invention, the overcurrent protection detection device can be realized only by using simple electronic components such as the sampling resistor, the current-limiting resistor, the filter capacitor, the NPN double triode, the PNP double triode, the NPN triode, the PNP triode and the like, so that the stable and reliable work of the switching power supply can be ensured, the service life is prolonged, the after-sale maintenance cost is reduced, and great economic benefits are brought to enterprises.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic diagram of a switching power supply overcurrent protection detection apparatus and a circuit structure of the switching power supply according to the present invention.
Reference numbers and corresponding part names:
the device comprises a 1-switching power supply drive control module and a 2-switching power supply overcurrent protection detection device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and the accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limiting the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the scope of the present invention.
Examples
As shown in fig. 1, according to the overcurrent protection detection device for the switching power supply of the present invention, one end of the overcurrent protection device is connected to the output end of the switching power supply drive control module, and the other end of the overcurrent protection device is connected to the switching power supply; controlling the output of the switching power supply within a rated power range through the overcurrent protection device;
the overcurrent protection device comprises an RC low-pass filter, a constant current circuit, a constant voltage circuit, a PNP transistor Q3 and an NPN transistor Q4, wherein the RC low-pass filter is connected with the constant current circuit, the constant current circuit is connected with the constant voltage circuit, the constant voltage circuit is connected with an emitter of the PNP transistor Q3, a collector of the PNP transistor Q3 is connected with a base of the NPN transistor Q4, and a base of the PNP transistor Q3 is connected with a common end of the constant current circuit and the constant voltage circuit; the emitter of the NPN transistor Q4 is grounded, the collector of the NPN transistor Q4 is connected to the switching power supply, and the collector of the NPN transistor Q4 is further connected to the switching power supply drive control module.
In this embodiment, the constant current circuit adopts an NPN phototransistor, the NPN phototransistor includes a transistor Q1 and a transistor Q2, the transistor Q1 and the transistor Q2 both adopt NPN transistors, and each parameter requirement of the transistor Q1 and the transistor Q2 is consistent;
the base electrode of the triode Q1 is connected with the base electrode of the triode Q2, the collector electrode of the triode Q1 is connected with the common end of the triode Q1 and the triode Q2, and the emitter electrode of the triode Q1 is connected with the output end of the RC low-pass filter;
and the emitter of the triode Q2 is connected with the output end of the RC low-pass filter, and the collector of the triode Q2 is connected with the input end of the constant voltage circuit.
In this embodiment, the RC low-pass filter includes a sampling resistor R3, a current-limiting resistor circuit, and a filter capacitor C1, the current-limiting resistor circuit includes a current-limiting resistor R1 and a current-limiting resistor R2, one end of the sampling resistor R3 is connected to an output end (point a) of the switching power supply drive control module, and the other end of the sampling resistor R3 is grounded; the RC low-pass filter is used for filtering out high-frequency interference signals.
One end of the current limiting resistor R1 is connected with the output end of the switching power supply drive control module and the common end of the sampling resistor R3, and the other end of the current limiting resistor R1 is connected with the emitting electrode of the triode Q1; one end of the current-limiting resistor R2 is grounded, and the other end of the current-limiting resistor R2 is connected with an emitting electrode of the triode Q2;
one end of the filter capacitor C1 is connected with the common end of the current-limiting resistor R1 and the emitting electrode of the triode Q1, and the other end of the filter capacitor C1 is grounded.
In this embodiment, the constant voltage circuit adopts PNP double transistors, the PNP double transistor includes a transistor Q5 and a transistor Q6, the transistor Q5 and the transistor Q6 both adopt PNP transistors, and each parameter of the transistor Q5 and the transistor Q6 requires consistency;
the collector of the triode Q5 is connected with the collector of the triode Q1, the base of the triode Q5 is connected with the base of the triode Q6, and the emitter of the triode Q5 is connected with the emitter of the PNP transistor Q3; the collector of the triode Q5 is also connected with the common end of the base of the triode Q5 and the base of the triode Q6;
a collector of the triode Q6 is connected with a collector of the triode Q2, an emitter of the triode Q6 is connected with a common end of an emitter of the triode Q5 and an emitter of the PNP transistor Q3, and the emitter of the triode Q6 is also connected with the switching power supply (Vdc 2+ 22V); and the collector electrode of the triode Q6 is also connected with the base electrode of the PNP transistor Q3.
In this embodiment, the power supply further includes a current-limiting resistor R4, one end of the current-limiting resistor R4 is connected to the collector of the transistor Q1, and the other end (point B) is connected to the collector of the transistor Q5.
In this embodiment, the sampling resistor R3 is a current sensing resistor.
In this embodiment, the current-limiting voltage-dividing resistor further comprises a current-limiting voltage-dividing resistor R5, a current-limiting resistor R6, a voltage-dividing resistor R7 and a pull-up resistor R8, wherein one end of the current-limiting resistor R6 is connected with the collector of the PNP transistor Q3, and the other end of the current-limiting resistor R6 is connected with the base of the NPN transistor Q4; one end of the current-limiting bleeder resistor R5 is connected with an emitting electrode of the triode Q2, and the other end of the current-limiting bleeder resistor R5 is connected with a collector electrode of the PNP transistor Q3 and the common end of the current-limiting resistor R6; one end of the divider resistor R7 is connected with the common end of the current limiting resistor R6 and the base electrode of the NPN transistor Q4, and the other end of the divider resistor R7 is grounded;
the current limiting resistor R6 divides a voltage point C to provide working voltage for the base electrode of the NPN transistor Q4, and the collector electrode of the NPN triode Q4 is connected with the pull-up resistors R8 to Vdc2 and connected with SD. One end of the pull-up resistor R8 is connected with the switching power supply (Vdc 2), and the other end of the pull-up resistor R8 is connected with the collector of the NPN transistor Q4.
When in implementation: one end of the overcurrent protection device is connected with the output end of the switch power supply drive control module, and the other end of the overcurrent protection device is connected with the switch power supply; controlling the output of the switching power supply within a rated power range through the overcurrent protection device; the switching power supply can work stably and reliably, the service life is prolonged, after-sale maintenance cost is reduced, and huge economic benefits are brought to enterprises.
Example 2
As shown in fig. 1, the present embodiment is different from embodiment 1 in that the present embodiment provides a switching power supply, where the power supply includes a switching power supply drive control module and a switching power supply overcurrent protection detection device described in embodiment 1, drive control is output to switching tubes T1 and T2 to the switching power supply drive control module, and the switching power supply overcurrent protection detection device is connected to an output end of the switching power supply drive control module;
the switching power supply drive control module is connected with the switching power supply overcurrent protection detection device;
in this embodiment, the switching power supply driving control module includes a driver U5, an HO pin of the driver U5 is connected to a switching tube T1 through a diode D5, an LO pin of the driver U5 is connected to a switching tube T2 through a diode D7, the switching tube T1 is connected to the switching tube T2, and an output end of the switching tube T2 is connected to an input end (a sampling resistor R3) of the switching power supply overcurrent protection detection apparatus; the CT pin of the driver U5 is connected with the output end (the collector electrode of an NPN transistor Q4) of the overcurrent protection detection device of the switching power supply; and the CT pin of the driver U5 is grounded through an NPN transistor Q4.
In this embodiment, the driver U5 has a model number of IR2153.
Specifically, the method comprises the following steps: the switching power supply driving control module 1: the driver is used for amplifying voltage and current to reach the purpose of power supply power; the switch power supply overcurrent protection detection device 2 is used for forming voltage and current output by excess load or outputting short circuit to cause overlarge current, and plays a role in protection.
As shown in fig. 1, in the design, for example, the voltage of the current at the point a is added across the sampling resistor R3 to be 0.5V, the sampling resistor R3=10m Ω, the current is (voltage at the point a is 0.5V ÷ sampling resistor 10m Ω = 50A), and the sampling resistor F3 is adjusted according to the actual power. That is, the output point a current voltage of 0.5V has been determined.
The current voltage 0.5V passes through a current limiting resistor R1=100 Ω, R2=100 Ω,0.5V ÷ R1 (R2) 100r =5mA filter capacitor C1 to filter out high-frequency interference signals and then provide the high-frequency interference signals to an NPN bipolar transistor Q1, a triode Q2 for constant current action, the triode Q1 provides 0.6V voltage + 0.5v =1.1v at both ends of a sampling resistor R3 to the triode Q2, the voltage 0.5V ÷ current limiting resistor R2 (100R) =5mA at both ends of the sampling resistor R3 is to keep the voltage 0.5V at both ends of the sampling resistor R3 divided by the current of the NPN triode Q2, V1 provides voltage to an emitter E of the PNP triode Q3 and PNP bipolar transistors Q5, Q6 emitter E, the triode Q5 provides 0.6V constant voltage to a base B of the triode Q6, the triode Q5 is in an operating state, a bias voltage is provided to the triode Q6, and once the PNP bipolar transistor Q2 is switched on, the base of the PNP bipolar transistor Q3 is switched on, and the PNP bipolar transistor Q3 is switched on. The voltage supplies voltage to the base B of the NPN triode Q4 through the current limiting resistor R6 and the voltage dividing resistor R7, and after the NPN triode Q4 is conducted and works, the SD pin stops working on the GND rear switching power supply driving control module 1, so that the protection effect is achieved.
Therefore, the adjustment can be carried out according to the actual power of the switching power supply (the parameters of the sampling resistor R3 are only needed).
The specific control principle is as follows: the switching power supply driving control module 1: amplifying voltage and current of the drive to achieve the purpose of power supply power; switching power supply overcurrent protection detection device 2: the excess load forms voltage and current output or output short circuit to cause overlarge current, thereby playing a protective role.
The switching power supply comprises a switching power supply drive control module, a switching power supply and the switching power supply overcurrent protection detection device in embodiment 1, wherein the switching power supply overcurrent protection detection device comprises a sampling resistor, a current-limiting shunt resistor, a filter capacitor, an NPN double transistor, a PNP transistor, an NPN transistor and a current-limiting voltage-dividing resistor.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The overcurrent protection detection device for the switching power supply is characterized in that one end of the overcurrent protection device is connected with the output end of a driving control module of the switching power supply, and the other end of the overcurrent protection device is connected with the switching power supply; controlling the output of the switching power supply within a rated power range through the overcurrent protection device;
the overcurrent protection device comprises an RC low-pass filter, a constant current circuit, a constant voltage circuit, a PNP transistor Q3 and an NPN transistor Q4, wherein the RC low-pass filter is connected with the constant current circuit, the constant current circuit is connected with the constant voltage circuit, the constant voltage circuit is connected with an emitter of the PNP transistor Q3, a collector of the PNP transistor Q3 is connected with a base of the NPN transistor Q4, and a base of the PNP transistor Q3 is connected with a common end of the constant current circuit and the constant voltage circuit; the emitter of the NPN transistor Q4 is grounded, the collector of the NPN transistor Q4 is connected with a switching power supply, and the collector of the NPN transistor Q4 is also connected with the switching power supply drive control module;
the constant current circuit adopts an NPN double transistor, the NPN double transistor comprises a triode Q1 and a triode Q2, the triode Q1 and the triode Q2 both adopt NPN triodes, and the parameters of the triode Q1 and the triode Q2 are consistent;
the base electrode of the triode Q1 is connected with the base electrode of the triode Q2, the collector electrode of the triode Q1 is connected with the common end of the triode Q1 and the common end of the triode Q2, and the emitter electrode of the triode Q1 is connected with the output end of the RC low-pass filter;
the emitting electrode of the triode Q2 is connected with the output end of the RC low-pass filter, and the collecting electrode of the triode Q2 is connected with the input end of the constant voltage circuit;
the constant voltage circuit adopts PNP double transistors, the PNP double transistors comprise a triode Q5 and a triode Q6, the triode Q5 and the triode Q6 both adopt PNP type transistors, and all parameters of the triode Q5 and the triode Q6 are required to be consistent;
the collector of the triode Q5 is connected with the collector of the triode Q1, the base of the triode Q5 is connected with the base of the triode Q6, and the emitter of the triode Q5 is connected with the emitter of the PNP transistor Q3; the collector of the triode Q5 is also connected with the common end of the base of the triode Q5 and the base of the triode Q6;
the collector of the triode Q6 is connected with the collector of the triode Q2, the emitter of the triode Q6 is connected with the common end of the emitter of the triode Q5 and the emitter of the PNP transistor Q3, and the emitter of the triode Q6 is also connected with the switching power supply; and the collector electrode of the triode Q6 is also connected with the base electrode of the PNP transistor Q3.
2. The switching power supply overcurrent protection detection device according to claim 1, wherein the RC low-pass filter includes a sampling resistor R3, a current-limiting resistor circuit, and a filter capacitor C1, the current-limiting resistor circuit includes a current-limiting resistor R1 and a current-limiting resistor R2, one end of the sampling resistor R3 is connected to an output terminal of the switching power supply drive control module, and the other end of the sampling resistor R3 is grounded;
one end of the current limiting resistor R1 is connected with the output end of the switching power supply drive control module and the common end of the sampling resistor R3, and the other end of the current limiting resistor R1 is connected with the emitting electrode of the triode Q1; one end of the current limiting resistor R2 is grounded, and the other end of the current limiting resistor R2 is connected with an emitting electrode of the triode Q2;
one end of the filter capacitor C1 is connected with the common end of the current-limiting resistor R1 and the emitting electrode of the triode Q1, and the other end of the filter capacitor C1 is grounded.
3. The overcurrent protection detection device of the switching power supply according to claim 1, further comprising a current-limiting resistor R4, wherein one end of the current-limiting resistor R4 is connected to a collector of the transistor Q1, and the other end is connected to a collector of the transistor Q5.
4. The overcurrent protection detection device of the switching power supply as recited in claim 2, wherein the sampling resistor R3 is a current sensing resistor.
5. The switching power supply overcurrent protection detection device according to claim 1, further comprising a current-limiting voltage-dividing resistor R5, a current-limiting resistor R6, a voltage-dividing resistor R7, and a pull-up resistor R8, wherein one end of the current-limiting resistor R6 is connected to a collector of a PNP transistor Q3, and the other end of the current-limiting resistor R6 is connected to a base of an NPN transistor Q4; one end of the current-limiting bleeder resistor R5 is connected with an emitter of the triode Q2, and the other end of the current-limiting bleeder resistor R5 is connected with a collector of the PNP transistor Q3 and a common end of the current-limiting resistor R6; one end of the voltage dividing resistor R7 is connected with the common end of the current limiting resistor R6 and the base electrode of the NPN transistor Q4, and the other end of the voltage dividing resistor R7 is grounded;
one end of the pull-up resistor R8 is connected with the switching power supply, and the other end of the pull-up resistor R8 is connected with the collector of the NPN transistor Q4.
6. A switching power supply, characterized in that the power supply comprises a switching power supply drive control module and a switching power supply overcurrent protection detection device according to any one of claims 1 to 5, wherein the switching power supply drive control module is connected with the switching power supply overcurrent protection detection device.
7. The switching power supply according to claim 6, wherein the switching power supply driving control module comprises a driver U5, the HO pin of the driver U5 is connected to a switching tube T1 through a diode D5, the LO pin of the driver U5 is connected to a switching tube T2 through a diode D7, the switching tube T1 is connected to the switching tube T2, and the output terminal of the switching tube T2 is connected to the input terminal of the switching power supply overcurrent protection detection apparatus; the CT pin of the driver U5 is connected with the output end of the overcurrent protection detection device of the switching power supply; and the CT pin of the driver U5 is grounded through an NPN transistor Q4.
8. The switching power supply as claimed in claim 7, wherein said driver U5 is model number IR2153.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10126958A (en) * | 1996-10-14 | 1998-05-15 | Yutaka Denki Seisakusho:Kk | Over-current protection circuit of power supply |
| CN101552452A (en) * | 2009-01-16 | 2009-10-07 | 上海新时达电气股份有限公司 | Short-circuit protection circuit for switching power supply of frequency converter |
| CN102013669A (en) * | 2010-11-16 | 2011-04-13 | 中国电子科技集团公司第五十八研究所 | Adjustable overheat protection circuit in switching power supply |
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