CN215268092U - Switching power supply system - Google Patents
Switching power supply system Download PDFInfo
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- CN215268092U CN215268092U CN202120704964.XU CN202120704964U CN215268092U CN 215268092 U CN215268092 U CN 215268092U CN 202120704964 U CN202120704964 U CN 202120704964U CN 215268092 U CN215268092 U CN 215268092U
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Abstract
The application provides a switching power supply system, which comprises a transformer and an output end, wherein the output end is electrically connected with the transformer and comprises a switching control circuit and a feedback control circuit; the switch control circuit is used for receiving a control signal of the terminal equipment and outputting a first voltage signal or a second voltage signal to the output voltage unit based on the control signal; the feedback control circuit is used for receiving the first voltage signal or the second voltage signal and correspondingly controlling the output end to output a first voltage or a second voltage according to the first voltage signal or the second voltage signal. The switching power supply system provided by the embodiment of the application avoids spark generation when the power supply output is contacted with the terminal equipment, and the circuit is simple, reliable and low in cost and has the advantages of easiness in production and quality control.
Description
Technical Field
The present application relates to the field of power supply technologies, and more particularly, to a switching power supply system.
Background
Generally, the power supply is used as a power supply device for all terminal devices, and the performance of the power supply needs to meet the requirements of power supply products. When the output of the power supply is in contact with the terminal equipment, the output end of the power supply outputs large voltage to the terminal equipment. At the moment, the power supply is large, so that the instantaneous large voltage can generate sparks, and the reliability of the whole power supply system is greatly influenced.
SUMMERY OF THE UTILITY MODEL
In view of the above, there is a need for a switching power supply system that can avoid the generation of sparks when the power supply output contacts the terminal device, and has the advantages of simple and reliable circuit, low cost, and easy production and quality control.
One aspect of the application provides a switching power supply system, which comprises a transformer, an output end, a switching control circuit and a feedback control circuit, wherein the output end is electrically connected with the transformer; the switch control circuit is used for receiving a control signal of the terminal equipment and outputting a first voltage signal or a second voltage signal to the feedback control circuit based on the control signal; the feedback control circuit is electrically connected with the switch control circuit and the output end, and is used for receiving the first voltage signal or the second voltage signal and correspondingly controlling the output end to output a first voltage or a second voltage according to the first voltage signal or the second voltage signal.
In one possible implementation manner, the switch control circuit includes a switch unit and a resistance unit, the resistance unit is electrically connected to the feedback control circuit, the switch unit is electrically connected between the resistance unit and the constant voltage end, and the switch unit is configured to receive a control signal of a terminal device and control an electrical connection relationship between the resistance unit and the constant voltage end according to the control signal.
In one possible implementation manner, the switching unit includes a switching tube, a first end of the switching tube is used for receiving a control signal of a terminal device, a second end of the switching tube is electrically connected to the constant voltage end, and a third end of the switching tube is electrically connected to the resistance unit.
In one possible implementation, the resistance unit includes a first resistance and a second resistance; one end of the first resistor and one end of the second resistor are electrically connected with the feedback control circuit, and the other end of the first resistor and the other end of the second resistor are electrically connected with the third end of the switching tube.
In one possible implementation manner, the switch control circuit further includes a bias unit, one end of the bias unit is electrically connected to the switch unit, the other end of the bias unit is electrically connected to the terminal device, and the bias unit is configured to bias a control signal output by the terminal device at a preset voltage and transmit the preset voltage to the switch unit.
In one possible implementation, the bias unit includes: the first capacitor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the first voltage regulator tube and the second capacitor;
the first end of the third resistor is used for being electrically connected with the terminal equipment, the first end of the third resistor is electrically connected with the constant voltage end through the first capacitor, the second end of the third resistor is electrically connected with the constant voltage end through the first voltage regulator tube, the second end of the third resistor is electrically connected with the first end of the fourth resistor, the first end of the fourth resistor is electrically connected with the constant voltage end through the fifth resistor, the second end of the fourth resistor is electrically connected with the constant voltage end through the sixth resistor, the second end of the fourth resistor is electrically connected with the constant voltage end through the second capacitor, and the second end of the fourth resistor is electrically connected with the first end of the switch tube.
In one possible implementation manner, the feedback control circuit includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a third capacitor, and a second regulator tube;
one end of the seventh resistor is electrically connected with the output end, and the other end of the seventh resistor is electrically connected with one end of the eighth resistor, one end of the ninth resistor, one end of the tenth resistor, the first end of the second voltage regulator tube, one end of the first resistor and one end of the second resistor; the other end of the eighth resistor is electrically connected with the second end of the switch tube, the second end of the second voltage regulator tube and the other end of the tenth resistor; and the third end of the second voltage-regulator tube is electrically connected with the other end of the ninth resistor through the third capacitor.
In one possible implementation manner, the switching power supply system further includes a first rectifying and filtering circuit, a second rectifying and filtering circuit, and an EMI circuit, the transformer includes a first winding and a second winding, the first winding is electrically connected to the EMI circuit through the first rectifying and filtering circuit, the EMI circuit is used for electrically connecting an alternating current power supply, and the second winding is electrically connected to the output end through the second rectifying and filtering circuit.
In one possible implementation manner, the switching power supply system further includes a power control switch, a power supply control circuit, a pulse width modulation control circuit, and a photoelectric coupler;
the first winding is also electrically connected with the power control switch, the power control switch is electrically connected between the pulse width modulation control circuit and the first rectification filter circuit, one end of the power supply control circuit is electrically connected with the first rectification filter circuit and the power control switch, the other end of the power supply control circuit is electrically connected with the pulse width modulation control circuit, and the pulse width modulation control circuit is electrically connected with the feedback control circuit through the photoelectric coupler.
In one possible implementation manner, the switching tube is an NPN type triode, and the first end, the second end, and the third end of the switching tube correspond to a base, an emitter, and a collector of the NPN type triode, respectively.
In the switching power supply system provided by the embodiment of the application, after the terminal device is contacted with the output terminal, the switching control circuit outputs a control signal to the switching control circuit, and the switching control circuit outputs a first voltage signal or a second voltage signal to the output voltage unit based on the control signal; the feedback control circuit is used for receiving the first voltage signal or the second voltage signal and correspondingly controlling the output end to output a first voltage or a second voltage according to the first voltage signal or the second voltage signal. Therefore, the switching power supply system provided by the embodiment of the application avoids spark generation when the power supply output is in contact with the terminal equipment, and has the advantages of simple and reliable circuit, low cost, easiness in production and quality control.
Drawings
Fig. 1 is a schematic structural diagram of a switching power supply system according to a preferred embodiment of the present application.
Fig. 2 is a schematic structural diagram of a switch control circuit according to a preferred embodiment of the present application.
Description of the main elements
Switching power supply system 100
AC power supply 200
EMI circuit 10
First rectifying and filtering circuit 20
First winding 22
Second winding 26
Power supply control circuit 60
Second rectifying and filtering circuit 70
Switch control circuit 90
Switch unit 901
Bias unit 903
Transformer T1
Photoelectric coupler U1
Switching tube Q1
First voltage regulator tube D1
Second voltage regulator tube D2
First to tenth resistors R1-R10
First to third capacitances C1-C3
The following detailed description will further illustrate the present application in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments in the present application, are within the scope of protection of the present application.
Referring to fig. 1, an embodiment of the present application provides a switching power supply system 100. The switching power supply system 100 may include a transformer T1, an EMI circuit 10, a first rectifying and filtering circuit 20, a power control switch 30, a Pulse Width Modulation (PWM) control circuit 40, a feedback control circuit 50, a power supply control circuit 60, a second rectifying and filtering circuit 70, a photo-coupler U1, an output terminal 80 (e.g., + DC output terminal, -DC output terminal), and a switch control circuit 90.
The EMI circuit 10 is used for filtering various interference signals coming from the power grid, and the first rectifying and filtering circuit 20 is used for converting the alternating current input by the alternating current power supply 200 into smooth direct current with small pulsation. A fuse 12 is also connected between the EMI circuit 10 and the ac power supply 200. In this embodiment, the ac power supply 200 may be a commercial power supply, such as a commercial power supply with 120V (volt), 220V, 50 hz, or 60 hz.
The primary side of the transformer T1 includes a first winding 22, and the first winding 22 is connected to the ac power supply 200 through a first rectifying and filtering circuit 20 and an EMI circuit 10. The power control switch 30 is connected to the first winding 22 and the first rectifying and filtering circuit 20, and the power control switch 30 is connected between the first rectifying and filtering circuit 20 and the first winding for controlling the normal on and off of the input end of the primary side of the transformer T1, so that the output end 80 led out from the secondary side of the transformer T1 can output voltage normally.
The secondary side of the transformer T1 includes a second winding 26, and a + DC output and a-DC output of the output 80 lead from the second winding 26. The + DC output terminal and the-DC output terminal are connected to the second winding 26 through the second rectifying and filtering circuit 70. The first rectifying and filtering circuit 20 and the second rectifying and filtering circuit 70 are configured to rectify and filter waveforms transformed by the transformer T1 under the control of the power control switch 30, so as to meet the corresponding ripple requirements.
The feedback control circuit 50 is electrically connected to the + DC output terminal of the output terminal 80, and the feedback control circuit 50 is also electrically connected to the PWM control circuit 40 through the photocoupler U1.
The PWM control circuit 40 is electrically connected to the power control switch 30, and the PWM control circuit 40 is also grounded through the inductor 24.
The feedback control circuit 50 is used for adjusting the pulse duty ratio output by the PWM control circuit 40 to control the conduction time of the first winding 22 in one period.
When the voltage of the ac power supply 200 changes or the on-load current of the output terminal changes, the variation of the output voltage of the output terminal is fed back to the PWM control circuit 40 through the photocoupler U1, and the PWM control circuit 40 performs PWM adjustment correspondingly, thereby controlling the power control switch 30 to achieve the purpose of stabilizing the output voltage. The PWM control circuit 40 is grounded through an inductor L.
Further, the second rectifying and filtering circuit 70 is configured to receive the output voltage of the transformer T1, and rectify and filter the output voltage of the transformer T1 and output the rectified and filtered output voltage to an output terminal.
In this embodiment, the power supply control circuit 60 is electrically connected to the PWM control circuit 40, the first rectifying and filtering circuit 20 and the power control switch 30, the power supply control circuit 60 outputs a power supply signal to the PWM control circuit 40, and the PWM control circuit 40 is configured to output a PWM signal to the power control switch 30 when receiving the power supply signal. The power control switch 30 is electrically connected to the first winding 22 on the primary side of the transformer T1 for controlling the on and off of the first winding 22 on the primary side of the transformer T1 according to a PWM signal.
When the output terminal 80 is electrically connected to the terminal device 300, the terminal device 300 outputs a high-level control signal to the switch control circuit 90, the switch control circuit 90 is configured to receive the control signal output by the terminal device 300, and output a first voltage signal or a second voltage signal to the feedback control circuit 50 based on the control signal, and the feedback control circuit 50 is configured to receive the first voltage signal or the second voltage signal, and correspondingly control multiple output terminals 80 to output a first voltage or a second voltage according to the first voltage signal or the second voltage signal.
When the terminal device 300 outputs a high-level control signal, the switch control circuit 90 outputs a low-level first voltage signal, and the feedback control circuit 50 controls the output terminal 80 to output a high voltage according to the low-level first voltage signal. When the terminal device 300 outputs a low-level control signal, the switch control circuit 90 outputs a high-level second voltage signal, and the feedback control circuit 50 controls the output terminal 80 to output a low voltage according to the high-level second voltage signal.
Referring to fig. 2, in a preferred embodiment, the switch control circuit 90 includes a switch unit 901, a resistor unit 902 and a bias unit 903, the resistor unit 902 is electrically connected to the feedback control circuit 50, the switch unit 901 is electrically connected between the resistor unit 902 and a constant voltage terminal, and the switch unit 901 is configured to receive a control signal of the terminal device 300 and control an electrical connection relationship between the resistor unit 902 and the constant voltage terminal according to the control signal. One end of the bias unit 903 is electrically connected to the switch unit 901, the other end of the bias unit 903 is electrically connected to the terminal device 300, and the bias unit 903 is configured to bias a control signal output by the terminal device 300 at a preset voltage and transmit the preset voltage to the switch unit 901.
The switch unit 901 comprises a switch tube Q1, and the resistor unit 902 comprises a first resistor R1 and a second resistor R2; the bias unit 903 includes: the circuit comprises a first capacitor C1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first voltage regulator tube D1 and a second capacitor C2. The feedback control circuit 50 comprises a voltage control unit 51, and the voltage control unit 51 comprises a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a third capacitor C3 and a second voltage regulator D2.
A first end of the third resistor R3 is electrically connected to a contact terminal S, where the contact terminal S is an end point of the terminal device 300 electrically connected to the switching power supply system 100. A first end of the third resistor R3 is configured to be electrically connected to the terminal device 300, a first end of the third resistor R3 is electrically connected to the constant voltage end through the first capacitor C1, a second end of the third resistor R3 is electrically connected to the constant voltage end through the first voltage regulator D1, a second end of the third resistor R3 is electrically connected to a first end of the fourth resistor R4, a first end of the fourth resistor R4 is electrically connected to the constant voltage end through the fifth resistor R5, a second end of the fourth resistor R4 is electrically connected to the constant voltage end through the sixth resistor R6, a second end of the fourth resistor R4 is electrically connected to the constant voltage end through the second capacitor C2, and a second end of the fourth resistor R4 is electrically connected to the first end of the switch tube Q1. The second end of the switch tube Q1 is electrically connected to the constant voltage end, the third end of the switch tube Q1 is electrically connected to one end of the first resistor R1 and one end of the second resistor R2, and the other end of the first resistor R1 and the other end of the second resistor R2 are both electrically connected to the voltage control unit 51.
One end of the seventh resistor R7 is electrically connected to the output terminal 80, and the other end of the seventh resistor R7 is electrically connected to one end of the eighth resistor R8, one end of the ninth resistor R9, one end of the tenth resistor R10, the first end of the second regulator D2, one end of the first resistor R1, and one end of the second resistor R2; the other end of the eighth resistor R8 is electrically connected to the second end of the switch tube Q1, the second end of the second regulator tube D2 and the other end of the tenth resistor R10; the third terminal of the second regulator tube D2 is electrically connected to the other terminal of the ninth resistor R9 through the third capacitor C3.
In this embodiment, the second zener diode D2 is a three-terminal zener diode. The constant voltage terminal may be ground.
The operation of the switching power supply system 100 of the present application will be described in detail with reference to the circuit diagram shown in fig. 2 as an example.
When the switching power supply system 100 of the present application is used, if the terminal device 300 is not in contact with the + DC output terminal, the-DC output terminal, and the contact terminal S, the feedback control circuit 50 is electrically connected to the + DC output terminal, the output voltage of the + DC output terminal is biased by the seventh resistor R7 and the eighth resistor R8, the divided voltage at the + DC output terminal is small, and the + DC output terminal outputs a low voltage.
When the terminal device 300 is in contact with the + DC output terminal, the-DC output terminal, and the contact terminal S, a user may control (e.g., in a software control manner) the terminal device 300 to output a high-level control signal to the contact terminal S, that is, a high voltage is received at the contact terminal S, and through the bias of the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the first capacitor C1, the second capacitor C2, and the first regulator D1, the potential at the first end, i.e., the base of the switching tube Q1 increases, the switching tube Q1 is turned on, then the first resistor R1 and the second resistor R2 are connected in parallel with the eighth resistor R8, the total resistance of the first resistor R1, the second resistor R2, and the eighth resistor R8 decreases, the voltage divided at the eighth resistor R8 decreases, the potential at the third end of the second regulator D2 decreases, the divided voltage at the + DC output terminal becomes large and the + DC output terminal outputs a high voltage. Thus, the + DC output terminal and the-DC output terminal start outputting high voltage, thereby supplying power to the terminal device 300.
In this way, the switch control circuit 90 is controlled by the high level signal output by the terminal device 300, when the terminal device 300 outputs the high level signal, the switch control circuit 90 outputs the first voltage signal of the low level, and the feedback control circuit 50 controls the output terminal 80 to output the high voltage according to the first voltage signal of the low level. Thus, the + DC output terminal outputs a high voltage to the terminal device 300 after the terminal device 300 is brought into contact with the + DC output terminal, thereby preventing sparks from being generated when a power supply is brought into contact with the terminal device 300.
The switching power supply system 100 provided in this embodiment of the application, by delaying the voltage output to the output terminal, may control the switching tube Q1 to be turned on after the output terminal contacts with the terminal device, so that the output terminal supplies power to the terminal device. Therefore, the switching power supply system provided by the embodiment of the application avoids spark generation when the power supply output is in contact with the terminal equipment, and has the advantages of simple and reliable circuit, low cost, easiness in production and quality control.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
It should be emphasized that the above-described embodiments are merely preferred examples of the application, rather than limitations of the application in any way, and all simple modifications, equivalent variations and modifications that can be made to the above-described embodiments according to the technical spirit of the application are intended to be included within the scope of the application.
Claims (10)
1. A switching power supply system comprises a transformer and an output end, wherein the output end is electrically connected with the transformer, and is characterized by comprising a switching control circuit and a feedback control circuit;
the switch control circuit is used for receiving a control signal of the terminal equipment and outputting a first voltage signal or a second voltage signal to the feedback control circuit based on the control signal;
the feedback control circuit is electrically connected with the switch control circuit and the output end, and is used for receiving the first voltage signal or the second voltage signal and correspondingly controlling the output end to output a first voltage or a second voltage according to the first voltage signal or the second voltage signal.
2. The switching power supply system according to claim 1, wherein the switching control circuit includes a switching unit and a resistance unit, the resistance unit is electrically connected to the feedback control circuit, the switching unit is electrically connected between the resistance unit and the constant voltage terminal, and the switching unit is configured to receive a control signal of a terminal device and control an electrical connection relationship between the resistance unit and the constant voltage terminal according to the control signal.
3. The switching power supply system according to claim 2, wherein the switching unit comprises a switching tube, a first end of the switching tube is used for receiving a control signal of a terminal device, a second end of the switching tube is electrically connected to the constant voltage end, and a third end of the switching tube is electrically connected to the resistance unit.
4. The switching power supply system according to claim 3, wherein the resistance unit includes a first resistance and a second resistance; one end of the first resistor and one end of the second resistor are electrically connected with the feedback control circuit, and the other end of the first resistor and the other end of the second resistor are electrically connected with the third end of the switching tube.
5. The switching power supply system according to claim 4, wherein the switching control circuit further comprises a bias unit, one end of the bias unit is electrically connected to the switching unit, the other end of the bias unit is electrically connected to the terminal device, and the bias unit is configured to bias the control signal output by the terminal device at a preset voltage and transmit the preset voltage to the switching unit.
6. The switching power supply system according to claim 5, wherein the bias unit includes: the first capacitor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the first voltage regulator tube and the second capacitor;
the first end of the third resistor is used for being electrically connected with the terminal equipment, the first end of the third resistor is electrically connected with the constant voltage end through the first capacitor, the second end of the third resistor is electrically connected with the constant voltage end through the first voltage regulator tube, the second end of the third resistor is electrically connected with the first end of the fourth resistor, the first end of the fourth resistor is electrically connected with the constant voltage end through the fifth resistor, the second end of the fourth resistor is electrically connected with the constant voltage end through the sixth resistor, the second end of the fourth resistor is electrically connected with the constant voltage end through the second capacitor, and the second end of the fourth resistor is electrically connected with the first end of the switch tube.
7. The switching power supply system according to claim 6, wherein the feedback control circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a third capacitor and a second voltage regulator;
one end of the seventh resistor is electrically connected with the output end, and the other end of the seventh resistor is electrically connected with one end of the eighth resistor, one end of the ninth resistor, one end of the tenth resistor, the first end of the second voltage regulator tube, one end of the first resistor and one end of the second resistor; the other end of the eighth resistor is electrically connected with the second end of the switch tube, the second end of the second voltage regulator tube and the other end of the tenth resistor; and the third end of the second voltage-regulator tube is electrically connected with the other end of the ninth resistor through the third capacitor.
8. The switching power supply system according to claim 7, wherein the switching power supply system further comprises a first rectifying and filtering circuit, a second rectifying and filtering circuit, and an EMI circuit, wherein the transformer comprises a first winding and a second winding, the first winding is electrically connected to the EMI circuit through the first rectifying and filtering circuit, the EMI circuit is used for electrically connecting an alternating current power supply, and the second winding is electrically connected to the output terminal through the second rectifying and filtering circuit.
9. The switching power supply system according to claim 8, further comprising a power control switch, a power supply control circuit, a pulse width modulation control circuit, and an opto-coupler;
the first winding is also electrically connected with the power control switch, the power control switch is electrically connected between the pulse width modulation control circuit and the first rectification filter circuit, one end of the power supply control circuit is electrically connected with the first rectification filter circuit and the power control switch, the other end of the power supply control circuit is electrically connected with the pulse width modulation control circuit, and the pulse width modulation control circuit is electrically connected with the feedback control circuit through the photoelectric coupler.
10. The switching power supply system according to claim 9, wherein the switching tube is an NPN transistor, and the first terminal, the second terminal, and the third terminal of the switching tube correspond to a base, an emitter, and a collector of the NPN transistor, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120704964.XU CN215268092U (en) | 2021-04-07 | 2021-04-07 | Switching power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120704964.XU CN215268092U (en) | 2021-04-07 | 2021-04-07 | Switching power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215268092U true CN215268092U (en) | 2021-12-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120704964.XU Active CN215268092U (en) | 2021-04-07 | 2021-04-07 | Switching power supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215268092U (en) |
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2021
- 2021-04-07 CN CN202120704964.XU patent/CN215268092U/en active Active
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