CN203911761U - Switching power supply circuit and electronic device - Google Patents

Switching power supply circuit and electronic device Download PDF

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Publication number
CN203911761U
CN203911761U CN201420275479.5U CN201420275479U CN203911761U CN 203911761 U CN203911761 U CN 203911761U CN 201420275479 U CN201420275479 U CN 201420275479U CN 203911761 U CN203911761 U CN 203911761U
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module
output
input
diode
switching power
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张保强
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Midea Group Co Ltd
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Midea Group Co Ltd
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Abstract

The utility model belongs to electronic circuit field and provides a switching power supply circuit and an electronic device. The switching power supply circuit is composed of a primary rectification filtering module, a switch driving module, a peak absorbing module, a transformer, a secondary rectification filtering module, a voltage feedback module, a voltage-stabilizing module, and a over-current protection module and does not need an integrated switch chip so as to achieve simple circuit structure and low cost. The switch driving module achieves corresponding switching operation according to the feedback voltage outputted by the voltage feedback module and the voltage stabilization control of the voltage-stabilizing module in order to dynamically control the voltage outputted by the secondary side of the transformer. When the operating current of the switch driving module is overlarge, the over-current protection module controls the current of the switch driving module in order to achieve over-current protection of the switch driving module.

Description

A kind of switching power circuit and electronic equipment
Technical field
The utility model belongs to electronic circuit field, relates in particular to a kind of switching power circuit and electronic equipment.
Background technology
Switching Power Supply is the little and high advantage of efficiency with its volume, in various electronic equipments, obtains using more and more widely.At present, inner integrated switch chip, the transformer of adopting of conventional switching power circuit, input circuit, output loop and filter circuit, its cost is relatively high.Load stability is being required to high application scenario, it is necessary in switching power circuit, adopting above-mentioned integrated switch chip, but at some to the less demanding application scenario of voltage stability, because the precision of voltage regulation to voltage is less demanding, if still keep adopting above-mentioned integrated switch chip in switching power circuit, the circuit structure relative complex that will seem, and can make circuit cost increase.Therefore there is circuit structure complexity and the high problem of cost in prior art, in to the less demanding application scenario of voltage stability.
Utility model content
The purpose of this utility model is to provide a kind of switching power circuit, is intended to solve prior art existing circuit structure complexity and the high problem of cost in to the less demanding application scenario of voltage stability.
The utility model is achieved in that a kind of switching power circuit, and it comprises:
Elementary rectification filtering module, switch drive module, peak absorbing module, transformer, secondary commutation filtration module, Voltage Feedback module, Voltage stabilizing module and overcurrent protection module;
The input of described elementary rectification filtering module connects the live wire of AC power, the output of described elementary rectification filtering module, the electric conduction pressure side of described switch drive module and the output of described peak absorbing module all connect the first end of the primary coil of described transformer, the input of the input of described switch drive module and described peak absorbing module is connected to the second end of the primary coil of described transformer altogether, the first end of the secondary coil of described transformer connects the input of described secondary commutation filtration module, the output of described secondary commutation filtration module connects the input of load, the loop end of described secondary commutation filtration module and the output of described load are connected to the second end of the secondary coil of described transformer altogether, the input of described Voltage Feedback module and the rectification output end of described Voltage stabilizing module are connected to the first end of the ancillary coil of described transformer altogether, the over-current detection end of described overcurrent protection module connects the output of described switch drive module, the output of described Voltage Feedback module, the voltage stabilizing control end of described Voltage stabilizing module and the input of described overcurrent protection module are connected to the controlled end of described switch drive module altogether, the loop end of described elementary rectification filtering module, the input of described Voltage stabilizing module, the second end of the output of described overcurrent protection module and the ancillary coil of described transformer is connected to the zero line of described AC power altogether.
Another object of the present utility model is also to provide a kind of electronic equipment that comprises above-mentioned switching power circuit.
The utility model comprises the switching power circuit of elementary rectification filtering module, switch drive module, peak absorbing module, transformer, secondary commutation filtration module, Voltage Feedback module, Voltage stabilizing module and overcurrent protection module by employing, it does not need to adopt integrated switch chip, circuit structure is simple, and cost is low; The voltage stabilizing control of the feedback voltage of being exported according to Voltage Feedback module by switch drive module and Voltage stabilizing module realizes corresponding switch motion; realize dynamically and controlling with the secondary output voltage to transformer; and in the time that the operating current of switch drive module is excessive; by overcurrent protection module, switch drive module is carried out to Current Control, so that switch drive module is realized to overcurrent protection.
Brief description of the drawings
Fig. 1 is the modular structure figure of the switching power circuit that provides of the utility model embodiment;
Fig. 2 is the exemplary circuit structure chart of the switching power circuit that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 1 shows the modular structure of the switching power circuit that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows:
The switching power circuit that the utility model embodiment provides comprises elementary rectification filtering module 100, switch drive module 200, peak absorbing module 300, transformer T1, secondary commutation filtration module 400, Voltage Feedback module 500, Voltage stabilizing module 600 and overcurrent protection module 700.
The input of elementary rectification filtering module 100 connects the live wire L of AC power AC, the output of elementary rectification filtering module 100, the first end of the primary coil L1 of the equal connection transformer T1 of output of the electric conduction pressure side of switch drive module 200 and peak absorbing module 300, the input of the input of switch drive module 200 and peak absorbing module 300 is connected to the second end of the primary coil L1 of transformer T1 altogether, the first end of the secondary coil L2 of transformer T1 connects the input of secondary commutation filtration module 400, the output of secondary commutation filtration module 400 connects the input of load 800, the loop end of secondary commutation filtration module 400 and the output of load 800 are connected to the second end of the secondary coil L2 of transformer T1 altogether, the rectification output end of the input of Voltage Feedback module 500 and Voltage stabilizing module 600 is connected to the first end of the ancillary coil L3 of transformer T1 altogether, the output of the over-current detection end connecting valve driver module 200 of overcurrent protection module 700, the output of Voltage Feedback module 500, the voltage stabilizing control end of Voltage stabilizing module 600 and the input of overcurrent protection module 700 are connected to the controlled end of switch drive module 200 altogether, the loop end of elementary rectification filtering module 100, the input of Voltage stabilizing module 600, the second end of the ancillary coil L3 of the output of overcurrent protection module 700 and transformer T1 is connected to the zero line N of AC power AC altogether.
In addition; above-mentioned switching power circuit also comprises a fuse F1; the first end of fuse F1 connects the zero line N of AC power AC, and the second end of fuse F1 is connected with the second end of input, the output of overcurrent protection module 700 and the ancillary coil L3 of transformer T1 of the loop end of elementary rectification filtering module 100, Voltage stabilizing module 600.Fuse FI is for realizing overcurrent protection to whole switching power circuit.
Fig. 2 shows the exemplary circuit structure of the switching power circuit that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows:
Elementary rectification filtering module 100 comprises the first diode D1 and the first capacitor C 1, the anode of the first diode D1 is the input of elementary rectification filtering module 100, the common contact of the first end of the negative electrode of the first diode D1 and the first capacitor C 1 is the output of elementary rectification filtering module 100, and the second end of the first capacitor C 1 is the loop end of elementary rectification filtering module 100.Wherein, the first diode D1 and the first capacitor C 1 form current rectifying and wave filtering circuit to the alternating current of AC power AC output carry out rectifying and wave-filtering process after output direct current.
Switch drive module 200 comprises the first resistance R 1 and a NPN type triode Q1, the first end of the first resistance R 1 is the electric conduction pressure side of switch drive module 200, the common contact of the base stage of the second end of the first resistance R 1 and a NPN type triode Q1 is the controlled end of switch drive module 200, and the collector and emitter of a NPN type triode Q1 is respectively input and the output of switch drive module 200.Wherein, the conducting of a NPN type triode Q1 or turn-off can control transformer T1 secondary output voltage.
Peak absorbing module 300 comprises:
The second diode D2, the second capacitor C 2 and the second resistance R 2;
The anode of the second diode D2 is the input of peak absorbing module 300, the first end of the first end of the second capacitor C 2 and the second resistance R 2 is connected to the negative electrode of the second diode D2 altogether, and the common contact of the second end of the second end of the second capacitor C 2 and the second resistance R 2 is the output of peak absorbing module 300.Wherein, the second diode D2, the second capacitor C 2 and the second resistance R 2 form peak voltage absorbing circuit, and it absorbs for the due to voltage spikes that a NPN type triode Q1 is produced in the process of carrying out switch motion.
Secondary commutation filtration module 400 comprises the 3rd diode D3 and the 3rd capacitor C 3, the anode of the 3rd diode D3 is the input of secondary commutation filtration module 400, the common contact of the first end of the negative electrode of the 3rd diode D3 and the 3rd capacitor C 3 is the output of secondary commutation filtration module 400, and the second end of the 3rd capacitor C 3 is the loop end of secondary commutation filtration module 400.Wherein, to form that direct current that current rectifying and wave filtering circuit exports the secondary coil L2 of transformer T1 carries out after rectifying and wave-filtering is processed be load supplying for the 3rd diode D3 and the 3rd capacitor C 3.
Voltage Feedback module 500 comprises the 3rd resistance R 3 and the 4th capacitor C 4, the first end of the 4th capacitor C 4 is the input of Voltage Feedback module 500, the second end of the 4th capacitor C 4 connects the first end of the 3rd resistance R 3, and the second end of the 3rd resistance R 3 is the output of Voltage Feedback module 500.Wherein, the 3rd resistance R 3 and the 4th capacitor C 4 form feedback circuit by the Voltage Feedback to the of the first end of the ancillary coil L3 of transformer T1 one NPN type triode Q1.
Voltage stabilizing module 600 comprises:
The 5th capacitor C 5, the 4th diode D4 and voltage stabilizing didoe ZD;
The input of the just very Voltage stabilizing module 600 of the 5th capacitor C 5, the anode of the anode of the 4th diode D4 and voltage stabilizing didoe ZD is connected to the negative pole of the 5th capacitor C 5 altogether, and the negative electrode of the negative electrode of the 4th diode D4 and voltage stabilizing didoe ZD is respectively rectification output end and the voltage stabilizing control end of Voltage stabilizing module 600.Wherein, the 4th diode D4 is to carrying out rectification processing through half alternating current wave of the 5th capacitor C 5, voltage stabilizing didoe ZD is at the lower voltage of the negative pole of the 5th capacitor C 5 during to the voltage stabilizing value (as 9V+0.5~0.7V) of voltage stabilizing didoe ZD, voltage stabilizing didoe ZD conducting, and then make the base stage of a NPN type triode Q1 be short-circuited to ground.
Overcurrent protection module 700 comprises:
The 4th resistance R 4, the 5th diode D5 and the 2nd NPN type triode Q2;
The common contact of the anode of the first end of the 4th resistance R 4 and the 5th diode D5 is the over-current detection end of overcurrent protection module 700; the negative electrode of the 5th diode D5 connects the grid of the 2nd NPN type triode Q2; the very input of overcurrent protection module 700 of current collection of the 2nd NPN type triode Q2, the common contact of the 2nd emitter of NPN type triode Q2 and the second end of the 4th resistance R 4 is the output of overcurrent protection module 700.
Below in conjunction with operation principle, the switching power circuit shown in Fig. 2 is described further:
AC power AC output AC electricity (as 220V alternating current) obtains direct current (as 300V direct current) and is carried in the first end of the primary coil L1 of transformer T1 after the first diode D1 rectification and the first capacitor C 1 filtering, simultaneously, this direct current is carried in the base stage of a NPN type triode Q1 through the first resistance R 1, thereby make a NPN type triode Q1 lightly conducting, now the primary coil L1 of transformer T1 starts to have electric current to pass through, and the first end of the ancillary coil L3 of transformer T1 can correspondingly form positive voltage, this positive voltage feeds back to the base stage of a NPN type triode Q1 through the 4th capacitor C 4 and the 3rd resistance R 3, a NPN type triode Q1 can further conducting, and even enter saturation conduction state, in this process, the output voltage of the secondary coil L2 of transformer T1 also can increase, the voltage producing on the ancillary coil L3 of transformer T1 also increases, so the 4th diode D4 cannot conducting, and then the voltage on the negative pole of the 5th capacitor C 5 is reduced gradually, when this lower voltage is during to the voltage stabilizing value (as 9V) of voltage stabilizing didoe ZD, voltage stabilizing didoe ZD meeting conducting, thereby the base stage of a NPN type triode Q1 is short-circuited to ground, to turn-off a NPN type triode Q1, the output voltage of transformer T1 will decrease.From foregoing, the voltage stabilizing value of voltage stabilizing didoe ZD has determined the output voltage of switching power circuit, so, in actual application, if need to change output voltage, as long as change the voltage stabilizing didoe ZD with corresponding voltage stabilizing value, voltage stabilizing value is less, the output voltage of switching power circuit is lower, otherwise the output voltage of switching power circuit is higher.
By the above-mentioned break-make control to a NPN type triode Q1, can reach the object of dynamic control output voltage, realize the effect of switching power circuit, and output allows open circuit or short circuit.
In addition; in the above-mentioned course of work; in the time that the On current of a NPN type triode Q1 is excessive; in the 4th resistance R 4, can produce a voltage; this voltage drives the 2nd NPN type triode Q2 conducting by the 5th diode D5; and then the base voltage of a NPN type triode Q1 is declined, the On current of a NPN type triode Q1 will correspondingly reduce, thereby reaches the object that a NPN type triode Q1 is realized to overcurrent protection.
Based on above-mentioned switching power circuit, the utility model embodiment also provides a kind of electronic equipment that comprises above-mentioned switching power circuit.
The utility model embodiment comprises the switching power circuit of elementary rectification filtering module 100, switch drive module 200, peak absorbing module 300, transformer T1, secondary commutation filtration module 400, Voltage Feedback module 500, Voltage stabilizing module 600 and overcurrent protection module 700 by employing, it does not need to adopt integrated switch chip, circuit structure is simple, and cost is low; The voltage stabilizing control of the feedback voltage of being exported according to Voltage Feedback module 500 by switch drive module 200 and Voltage stabilizing module 600 realizes corresponding switch motion; realize dynamically and controlling with the secondary output voltage to transformer T1; and in the time that the operating current of switch drive module 200 is excessive; by overcurrent protection module 700, switch drive module 200 is carried out to Current Control, so that switch drive module 200 is realized to overcurrent protection.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.

Claims (10)

1. a switching power circuit, is characterized in that, described switching power circuit comprises:
Elementary rectification filtering module, switch drive module, peak absorbing module, transformer, secondary commutation filtration module, Voltage Feedback module, Voltage stabilizing module and overcurrent protection module;
The input of described elementary rectification filtering module connects the live wire of AC power, the output of described elementary rectification filtering module, the electric conduction pressure side of described switch drive module and the output of described peak absorbing module all connect the first end of the primary coil of described transformer, the input of the input of described switch drive module and described peak absorbing module is connected to the second end of the primary coil of described transformer altogether, the first end of the secondary coil of described transformer connects the input of described secondary commutation filtration module, the output of described secondary commutation filtration module connects the input of load, the loop end of described secondary commutation filtration module and the output of described load are connected to the second end of the secondary coil of described transformer altogether, the input of described Voltage Feedback module and the rectification output end of described Voltage stabilizing module are connected to the first end of the ancillary coil of described transformer altogether, the over-current detection end of described overcurrent protection module connects the output of described switch drive module, the output of described Voltage Feedback module, the voltage stabilizing control end of described Voltage stabilizing module and the input of described overcurrent protection module are connected to the controlled end of described switch drive module altogether, the loop end of described elementary rectification filtering module, the input of described Voltage stabilizing module, the second end of the output of described overcurrent protection module and the ancillary coil of described transformer is connected to the zero line of described AC power altogether.
2. switching power circuit as claimed in claim 1; it is characterized in that; described switching power circuit also comprises fuse; the first end of described fuse connects the zero line of described AC power, and the second end of described fuse is connected with the second end of the output of the input of the loop end of described elementary rectification filtering module, described Voltage stabilizing module, described overcurrent protection module and the ancillary coil of described transformer.
3. switching power circuit as claimed in claim 1, it is characterized in that, described elementary rectification filtering module comprises the first diode and the first electric capacity, the anode of described the first diode is the input of described elementary rectification filtering module, the output that the common contact of the first end of the negative electrode of described the first diode and described the first electric capacity is described elementary rectification filtering module, the loop end that the second end of described the first electric capacity is described elementary rectification filtering module.
4. switching power circuit as claimed in claim 1, it is characterized in that, described switch drive module comprises the first resistance and a NPN type triode, the first end of described the first resistance is the electric conduction pressure side of described switch drive module, the controlled end that the common contact of the base stage of the second end of described the first resistance and a described NPN type triode is described switch drive module, the collector and emitter of a described NPN type triode is respectively input and the output of described switch drive module.
5. switching power circuit as claimed in claim 1, is characterized in that, described peak absorbing module comprises:
The second diode, the second electric capacity and the second resistance;
The anode of described the second diode is the input of described peak absorbing module, the first end of the first end of described the second electric capacity and described the second resistance is connected to the negative electrode of described the second diode altogether, and the common contact of the second end of described the second electric capacity and the second end of described the second resistance is the output of described peak absorbing module.
6. switching power circuit as claimed in claim 1, it is characterized in that, described secondary commutation filtration module comprises the 3rd diode and the 3rd electric capacity, the anode of described the 3rd diode is the input of described secondary commutation filtration module, the common contact of the first end of the negative electrode of described the 3rd diode and described the 3rd electric capacity is the output of described secondary commutation filtration module, and the second end of described the 3rd electric capacity is the loop end of described secondary commutation filtration module.
7. switching power circuit as claimed in claim 1, it is characterized in that, described Voltage Feedback module comprises the 3rd resistance and the 4th electric capacity, the first end of described the 4th electric capacity is the input of described Voltage Feedback module, the second end of described the 4th electric capacity connects the first end of described the 3rd resistance, and the second end of described the 3rd resistance is the output of described Voltage Feedback module.
8. switching power circuit as claimed in claim 1, is characterized in that, described Voltage stabilizing module comprises:
The 5th electric capacity, the 4th diode and voltage stabilizing didoe;
The input of the just very described Voltage stabilizing module of described the 5th electric capacity, described the 4th anode of diode and the anode of described voltage stabilizing didoe are connected to the negative pole of described the 5th electric capacity altogether, and described the 4th negative electrode of diode and the negative electrode of described voltage stabilizing didoe are respectively rectification output end and the voltage stabilizing control end of described Voltage stabilizing module.
9. switching power circuit as claimed in claim 1, is characterized in that, described overcurrent protection module comprises:
The 4th resistance, the 5th diode and the 2nd NPN type triode;
The over-current detection end that the common contact of the anode of the first end of described the 4th resistance and described the 5th diode is described overcurrent protection module; the negative electrode of described the 5th diode connects the grid of described the 2nd NPN type triode; the input of the very described overcurrent protection module of current collection of described the 2nd NPN type triode, the output that the common contact of the second end of the emitter of described the 2nd NPN type triode and described the 4th resistance is described overcurrent protection module.
10. an electronic equipment, is characterized in that, described electronic equipment comprises the switching power circuit as described in claim 1-9 any one.
CN201420275479.5U 2014-05-27 2014-05-27 Switching power supply circuit and electronic device Active CN203911761U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420275479.5U CN203911761U (en) 2014-05-27 2014-05-27 Switching power supply circuit and electronic device

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Application Number Priority Date Filing Date Title
CN201420275479.5U CN203911761U (en) 2014-05-27 2014-05-27 Switching power supply circuit and electronic device

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106710532A (en) * 2017-02-20 2017-05-24 深圳市华星光电技术有限公司 Backlight drive circuit and liquid-crystal display
CN110446285A (en) * 2018-05-02 2019-11-12 佛山市顺德区美的电热电器制造有限公司 Electric cooking device and electromagnetic heating system for electric cooking device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106710532A (en) * 2017-02-20 2017-05-24 深圳市华星光电技术有限公司 Backlight drive circuit and liquid-crystal display
CN106710532B (en) * 2017-02-20 2019-03-26 深圳市华星光电技术有限公司 A kind of backlight drive circuit and liquid crystal display
CN110446285A (en) * 2018-05-02 2019-11-12 佛山市顺德区美的电热电器制造有限公司 Electric cooking device and electromagnetic heating system for electric cooking device

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