CN207251453U - The remote control circuit and its Switching Power Supply of a kind of Switching Power Supply - Google Patents
The remote control circuit and its Switching Power Supply of a kind of Switching Power Supply Download PDFInfo
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- CN207251453U CN207251453U CN201721091383.3U CN201721091383U CN207251453U CN 207251453 U CN207251453 U CN 207251453U CN 201721091383 U CN201721091383 U CN 201721091383U CN 207251453 U CN207251453 U CN 207251453U
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- resistance
- triode
- power supply
- switching power
- remote control
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Abstract
The utility model discloses a kind of remote control circuit of Switching Power Supply, is connected between the COM ends of PWM chip and the CTRL ends of Switching Power Supply, to control the output of positive pole and shut-off, including：Diode and electrostatic discharge protective circuit; there is the electrostatic discharge protective circuit first input end being connected with positive pole, the second input terminal being connected with the CTRL ends, the first output terminal being connected with the anode of the diode and the second output terminal of ground connection, the cathode of the diode to be connected with the COM ends.The invention also discloses a kind of Switching Power Supply.The utility model can provide electrostatic protection in the CTRL end in contact electrostatic to the PWM chip.
Description
Technical field
It the utility model is related to switch power technology field, and in particular to the remote control circuit and its switch of a kind of Switching Power Supply
Power supply.
Background technology
For Switching Power Supply as a kind of high frequency device for converting electric energy, it is to utilize electronic switching device（As transistor, field are imitated
Ying Guan, controllable silicon thyristor etc.）, by control circuit, make electronic switching device ceaselessly " on " and " shut-off ", allow electronic cutting
Close device and impulse modulation is carried out to input voltage, can be reconciled certainly so as to fulfill DC/AC, DC/DC voltage transformation, and output voltage
Dynamic voltage stabilizing.
As shown in Figure 1, the control terminal that current inverse-excitation type DC-DC Switching Power Supplies use（CTRL ends）All it is from PWM chip
100 one diode D1 to CTRL end of COM ends reversal connection, that is, form remote control circuit, to be less than by the COM ends of PWM chip 100
The characteristic of 1V chips shut-off output goes the output and shut-off of control positive pole, however, such remote control circuit, has at CTRL ends
PWM chip 100 can easily be punctured during electrostatic.
Utility model content
For overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of remote control electricity of Switching Power Supply
Road, for being protected in CTRL end in contact electrostatic to PWM chip.
The purpose of this utility model is achieved through the following technical solutions：
A kind of remote control circuit of Switching Power Supply, is connected between the COM ends of PWM chip and the CTRL ends of Switching Power Supply, uses
To control the output of positive pole and shut-off, including：Diode and electrostatic discharge protective circuit, the electrostatic discharge protective circuit have and electricity
The first input end of source cathode connection, the second input terminal for being connected with the CTRL ends, be connected with the anode of the diode
First output terminal and the second output terminal of ground connection, the cathode of the diode are connected with the COM ends；When the CTRL is terminated
When touching electrostatic, the electrostatic discharge protective circuit provides electrostatic protection for the PWM chip.
Preferably, the electrostatic discharge protective circuit includes the first triode, the second triode, first resistor, second resistance, the
Three resistance, the 4th resistance, the 5th resistance and the 6th resistance, collector and the first resistor of first triode connect
Connect, and the anode with the diode, one end of the second resistance are connected its common port respectively；The base of first triode
Pole is connected with the 3rd resistor, and its common port other end with the second resistance, the collection of second triode respectively
Electrode connects；The base stage of second triode is connected between the 5th resistance and the 6th resistance；5th electricity
The other end of resistance is connected with the CTRL ends, and its common port is connected with one end of the 4th resistance；The first resistor
The other end of the other end, the other end of the 3rd resistor and the 4th resistance is connected with the positive pole；It is described
The other end of the emitter of first triode, the emitter of second triode and the 6th resistance is grounded.
Preferably, the remote control circuit further includes filter capacitor, the filter capacitor and the 4th resistor coupled in parallel.
Preferably, first triode is NPN type triode.
Preferably, second triode is NPN type triode.
In order to solve identical technical problem, the utility model additionally provides a kind of Switching Power Supply, including：Above-mentioned remote control
Circuit.
Compared with prior art, the utility model has the advantages that：
The utility model makes the positive pole be opened with described by the COM ends reversal connection diode in the PWM chip
The CTRL ends in powered-down source are connected by the electrostatic discharge protective circuit with the anode of the diode, in this way, can both control power supply
Output and shut-off, at the same time, the electrostatic can also be avoided to be directly delivered to described in the CTRL end in contact electrostatic
PWM chip, is not especially high electrostatic damage by electrostatic to protect the PWM chip.
Brief description of the drawings
Fig. 1 is the circuit diagram of the remote control circuit of existing Switching Power Supply；
Fig. 2 is the circuit diagram of the remote control circuit of Switching Power Supply in the utility model embodiment.
Embodiment
The utility model is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
A kind of remote control circuit of Switching Power Supply of the preferred embodiment in the utility model is illustrated in figure 2, is connected to PWM chip
Between 100 COM ends and the CTRL ends of Switching Power Supply, to control the output of positive pole and shut-off, which includes：
Diode D1 and electrostatic discharge protective circuit 200, the electrostatic discharge protective circuit 200 have be connected with positive pole first input end,
The second input terminal for being connected with the CTRL ends, the of the first output terminal being connected with the anode of the diode D1 and ground connection
Two output terminals, the cathode of the diode D1 are connected with the COM ends, the output head grounding of the electrostatic discharge protective circuit 200；When
During the CTRL end in contact electrostatic, the electrostatic discharge protective circuit 200 provides electrostatic protection for the PWM chip 100.
Specifically, the electrostatic discharge protective circuit 200 includes the first triode Q1, the second triode Q2, first resistor R1, the
Two resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6, the collection of the first triode Q1
Electrode is connected with the first resistor R1, and its common port anode with the diode D1, the second resistance R2 respectively
One end connects；The base stage of the first triode Q1 is connected with the 3rd resistor R3, and its common port is respectively with described second
The collector connection of the other end of resistance R2, the second triode Q2；The base stage of the second triode Q2 is connected to described
Between 5th resistance R5 and the 6th resistance R6；The other end of the 5th resistance R5 is connected with the CTRL ends, and it is public
End is connected with one end of the 4th resistance R4 altogether；The other end of the other end of the first resistor R1, the 3rd resistor R3
And the other end of the 4th resistance R4 is connected with the positive pole；It is the emitter of the first triode Q1, described
The other end of the emitter of second triode Q2 and the 6th resistance R6 are grounded.
, can be by the 4th resistance R4, described when the CTRL ends of Switching Power Supply are in blank state or high level
5th resistance R5 and the 6th resistance R6 turns on the second triode Q2, and the second triode Q2 turned on and described the
Three resistance R3 can clamp down on the base stage of the first triode Q1, that is, drag down the base voltage of the first triode Q1, make
First triode Q1 cut-off, and at this time the supply voltage of the positive pole output can by the first resistor R1,
Second resistance R2 and two triode make the collector of the first triode Q1 be in high level, so as to pass through two pole
Pipe D1 makes the COM ends of the PWM chip 100 be also at high level, so that the PWM chip 100 normally exports, control power supply is just
Open output in pole.During this, when the CTRL end in contact electrostatic, the electrostatic can pass through the 5th resistance R5 and institute
State the 6th resistance R6 and be oriented to earth polar, to avoid the COM ends of the PWM chip 100 are directly directed to, hit to avoid PWM chip 100
Wear, protect it from being damaged and damage.
When the CTRL ends of Switching Power Supply are in low level, the base stage of the second triode Q2 is because by the 5th resistance
R5 and the 6th resistance R6 are clamped down on and are in low level, are kept it turned off；The supply voltage of the positive pole output can at this time
Turn on the first triode Q1 by the first resistor R1, the second resistance R2 and the 3rd resistor R3, and
The collector pole of the first triode Q1 of conducting is in low level, according to the characteristic of diode D1（Such as 0.7V or so
Pressure drop）, it can make the COM ends of the PWM chip 100 of the anode of the connection diode D1 be in low level（It is such as small
In 1V）, so that the shut-off output of the PWM chip 100, controls the positive pole shut-off output.
The remote control circuit can also include filter capacitor C1, and the filter capacitor C1 is in parallel with the 4th resistance R4,
For filtering interference signals, turned on to avoid the first triode Q1 because of malfunction.
The first triode Q1 can be NPN type triode, and the second triode Q2 can be NPN type triode.
It is of course also possible to it is other kinds of triode.
In addition, the utility model embodiment additionally provides a kind of Switching Power Supply with above-mentioned remote control circuit, in control electricity
While the output and shut-off in source, the electrostatic can also be avoided to be directly delivered to described in the CTRL end in contact electrostatic
PWM chip 100, is not especially high electrostatic damage by electrostatic to protect the PWM chip 100.
The embodiment not limited to this of the utility model, according to the above of the utility model, utilizes the general of this area
Logical technological know-how and customary means, under the premise of the above-mentioned basic fundamental thought of the utility model is not departed from, the utility model may be used also
To make the modification of other diversified forms, replacement or change, all fall within the utility model rights protection scope.
Claims (6)
1. a kind of remote control circuit of Switching Power Supply, is connected between the COM ends of PWM chip and the CTRL ends of Switching Power Supply, to
Control the output and shut-off of positive pole, it is characterised in that including：Diode and electrostatic discharge protective circuit, the electrostatic protection electricity
Road has the first input end being connected with positive pole, the second input terminal being connected with the CTRL ends and the diode
First output terminal of anode connection and the second output terminal of ground connection, the cathode of the diode are connected with the COM ends；Work as institute
When stating CTRL end in contact electrostatic, the electrostatic discharge protective circuit provides electrostatic protection for the PWM chip.
2. the remote control circuit of Switching Power Supply as claimed in claim 1, it is characterised in that the electrostatic discharge protective circuit includes first
Triode, the second triode, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance, institute
The collector for stating the first triode is connected with the first resistor, and its common port anode with the diode, described respectively
One end connection of second resistance；The base stage of first triode is connected with the 3rd resistor, and its common port respectively with institute
State the collector connection of the other end, second triode of second resistance；The base stage of second triode is connected to described
Between 5th resistance and the 6th resistance；The other end of 5th resistance is connected with the CTRL ends, and its common port with
One end connection of 4th resistance；The other end of the first resistor, the other end of the 3rd resistor and the described 4th
The other end of resistance is connected with the positive pole；The transmitting of the emitter of first triode, second triode
The other end of pole and the 6th resistance is grounded.
3. the remote control circuit of Switching Power Supply as claimed in claim 2, it is characterised in that the remote control circuit further includes filtered electrical
Hold, the filter capacitor and the 4th resistor coupled in parallel.
4. the remote control circuit of Switching Power Supply as claimed in claim 3, it is characterised in that first triode is NPN type three
Pole pipe.
5. the remote control circuit of Switching Power Supply as claimed in claim 4, it is characterised in that second triode is NPN type three
Pole pipe.
A kind of 6. Switching Power Supply, it is characterised in that including：Claim 1-5 any one of them remote control circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721091383.3U CN207251453U (en) | 2017-08-29 | 2017-08-29 | The remote control circuit and its Switching Power Supply of a kind of Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721091383.3U CN207251453U (en) | 2017-08-29 | 2017-08-29 | The remote control circuit and its Switching Power Supply of a kind of Switching Power Supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207251453U true CN207251453U (en) | 2018-04-17 |
Family
ID=61883603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721091383.3U Active CN207251453U (en) | 2017-08-29 | 2017-08-29 | The remote control circuit and its Switching Power Supply of a kind of Switching Power Supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207251453U (en) |
-
2017
- 2017-08-29 CN CN201721091383.3U patent/CN207251453U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: Room 302, building 4, 63 Punan Road, Huangpu District, Guangzhou City, Guangdong Province Patentee after: GUANGZHOU AIPU ELECTRON TECHNOLOGY Co.,Ltd. Address before: 510315 No. three, No. two, No. 37, No. 4, Qixing Road, Guangzhou, Guangdong, Haizhuqu District Patentee before: GUANGZHOU AIPU ELECTRON TECHNOLOGY Co.,Ltd. |
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| CP02 | Change in the address of a patent holder |