CN221283061U - Voltage stabilizing device for switching power supply - Google Patents
Voltage stabilizing device for switching power supply Download PDFInfo
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- CN221283061U CN221283061U CN202322553429.0U CN202322553429U CN221283061U CN 221283061 U CN221283061 U CN 221283061U CN 202322553429 U CN202322553429 U CN 202322553429U CN 221283061 U CN221283061 U CN 221283061U
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- switching tube
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- power supply
- voltage stabilizing
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- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 30
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
The utility model discloses a voltage stabilizing device for a switching power supply, which structurally comprises a first switching tube, a second switching tube, a first capacitor and a second capacitor, wherein the first switching tube and the second switching tube form a first bridge arm of a half-bridge type inverter circuit, the middle point positions of the capacitors C1 and C2 are connected with one end of a high-frequency transformer, the other end of the high-frequency transformer is connected with a common connecting end of the first switching tube and the second switching tube, and a PWM (pulse width modulation) controller is connected with the input end of the first bridge arm and is used for controlling the alternate conduction of the first switching tube and the second switching tube.
Description
Technical Field
The application relates to the technical field of circuit protection, in particular to a voltage stabilizing device for a switching power supply.
Background
The switching power supply is widely applied to various electronic devices, and the voltage stabilizing performance of the switching power supply has important significance for the normal operation of the devices. The existing switching power supply voltage stabilizing device has the problems of poor load characteristic, unsatisfactory voltage stabilizing effect and the like. Therefore, a voltage stabilizing device with good voltage stabilizing effect and excellent load characteristics is urgently needed.
Disclosure of utility model
Compared with the prior art, the voltage stabilizing device adopting a half-bridge inverter circuit and closed-loop control has the advantages of good voltage stabilizing effect, excellent load characteristic and the like.
The file is realized by the following technical scheme: the application discloses a voltage stabilizing device for a switching power supply, which structurally comprises a first switching tube, a second switching tube, a first capacitor and a second capacitor, wherein the first switching tube and the second switching tube form a first bridge arm of a half-bridge inverter circuit, the middle point positions of the first capacitor and the second capacitor are connected with one end of a high-frequency transformer, the other end of the high-frequency transformer is connected with a common connecting end of the first switching tube and the second switching tube, and a PWM (pulse-width modulation) controller is connected with the input end of the first bridge arm and used for controlling alternate conduction of the first switching tube and the second switch.
Preferably, the feedback module further comprises a resistor divider, an error amplifier and a comparator, wherein the resistor divider is composed of a first resistor and a second resistor.
Preferably, the filter circuit is further comprised of an inductor and a third capacitor.
The application discloses a voltage stabilizing device for a switching power supply, which is compared with the prior art:
The voltage stabilizing device adopts a half-bridge inverter circuit and has the advantages of simple structure, stability and reliability. The PWM controller controls the alternate conduction of the switching tube to realize the inversion function, and the output voltage is adjustable. The closed-loop control is adopted, and the duty ratio of the PWM output signal is automatically adjusted so as to maintain the output direct-current voltage of the power supply to be unchanged within a certain range, thereby achieving the voltage stabilizing effect. The voltage stabilizing device has the advantages of excellent load characteristic, good voltage stabilizing effect and the like.
Drawings
Fig. 1 is a schematic structural diagram of a voltage stabilizing device for a switching power supply according to an embodiment of the present application.
Detailed Description
The following describes in detail examples of the present application, which are implemented on the premise of the technical solution of the present application, and detailed implementation and specific operation procedures are given, but the scope of protection of the present application is not limited to the following examples.
As shown in fig. 1, the present application file is implemented by the following technical scheme: the application discloses a voltage stabilizing device for a switching power supply, which structurally comprises a first switching tube, a second switching tube, a first capacitor and a second capacitor, wherein the first switching tube and the second switching tube form a first bridge arm of a half-bridge inverter circuit, the middle points of the capacitors C1 and C2 are connected with one end of a high-frequency transformer, the other end of the high-frequency transformer is connected with a common connecting end of the first switching tube and the second switching tube, and a PWM (pulse-width modulation) controller is connected with the input end of the first bridge arm and used for controlling alternate conduction of the first switching tube and the second switching tube.
In one embodiment, the system further comprises a feedback module, wherein the feedback module comprises a resistor voltage divider, an error amplifier and a comparator, and the resistor voltage divider is composed of a first resistor and a second resistor.
In one embodiment, the filter circuit further comprises a filter circuit, and the filter circuit is composed of an inductor and a third capacitor.
As shown in fig. 1, the medium voltage device of the present application includes switching transistors S1 and S2, optionally MOSFETs, for forming a bridge arm of a half-bridge inverter circuit. The capacitors C1 and C2 and the switching tubes S1 and S2 form the other bridge arm of the half-bridge inverter circuit. The primary end of the high-frequency transformer is connected with the midpoint of the capacitors C1 and C2, and the other end of the high-frequency transformer is connected with the common connection end of the switching tubes S1 and S2. The PWM controller is used for controlling the switching tubes S1 and S2 to be alternately turned on to realize the inversion function. The step-down, rectifying and filtering circuit converts the inverted alternating voltage into an adjustable direct-current power supply voltage for output. The feedback circuit is used for monitoring the output voltage and adjusting the duty ratio of the PWM controller so as to realize the functions of closed-loop control and voltage stabilization. The voltage stabilizing device adopts a half-bridge inverter circuit and has the advantages of simple structure, stability and reliability. The PWM controller controls the alternate conduction of the switching tube to realize the inversion function, and the output voltage is adjustable. The closed-loop control is adopted, and the duty ratio of the PWM output signal is automatically adjusted so as to maintain the output direct-current voltage of the power supply to be unchanged within a certain range, thereby achieving the voltage stabilizing effect. The voltage stabilizing device has the advantages of excellent load characteristic, good voltage stabilizing effect and the like.
And a feedback circuit: the feedback circuit mainly comprises a resistor voltage divider, an error amplifier, a comparator and other elements. The resistor divider is composed of two resistors R1 and R2 for reducing the output voltage to a lower voltage for comparison by the error amplifier. The error amplifier is used for amplifying the difference between the output voltage and the reference voltage to generate an error signal. The comparator compares the error signal with the sawtooth wave signal of the PWM controller, and adjusts the duty ratio of the PWM controller according to the comparison result, thereby realizing the closed-loop control and voltage stabilizing functions.
Step-down circuit: the step-down circuit mainly comprises a high-frequency transformer and a rectifier diode D1. The primary side of the high-frequency transformer receives the alternating voltage generated by the half-bridge inverter circuit, reduces the voltage to a lower voltage through the electromagnetic induction action of the transformer, and outputs the voltage to the secondary side of the transformer. The rectifier diode D1 rectifies the ac voltage on the secondary side into a dc voltage.
And a filter circuit: the filter circuit mainly comprises an inductor L1 and a capacitor C3. The inductor L1 is used for reducing the current pulsation after rectification, and the capacitor C3 is used for smoothing the voltage pulsation after rectification, so that a stable direct current output voltage is obtained.
The working principle of the whole circuit is as follows:
The half-bridge inverter circuit converts the dc power supply voltage into an ac voltage by alternately turning on the switching transistors S1 and S2.
The ac voltage is stepped down by a high frequency transformer and rectified by a rectifier diode D1 to obtain a dc voltage.
Filtering is carried out through an inductor L and a capacitor C3, so that a stable direct current output voltage is obtained.
The feedback circuit reduces the output voltage through the resistor divider and compares it with the reference voltage to generate an error signal.
The error signal is compared with the sawtooth wave signal of the PWM controller through the comparator, and the duty ratio of the PWM controller is adjusted according to the comparison result, so that the closed-loop control and voltage stabilizing functions are realized.
In conclusion, the voltage stabilizing device provided by the application adopts the half-bridge inverter circuit, and has the advantages of simple structure, stability and reliability. The PWM controller controls the alternate conduction of the switching tube to realize the inversion function, and the output voltage is adjustable. The closed-loop control is adopted, and the duty ratio of the PWM output signal is automatically adjusted so as to maintain the output direct-current voltage of the power supply to be unchanged within a certain range, thereby achieving the voltage stabilizing effect. The voltage stabilizing device has the advantages of excellent load characteristic, good voltage stabilizing effect and the like.
The foregoing is only a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art should be able to apply to the present application and cover all modifications and equivalents thereof within the scope of the present application.
It should be noted that in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (3)
1. The voltage stabilizing device for the switching power supply is characterized by comprising a first switching tube, a second switching tube, a first capacitor and a second capacitor, wherein the first switching tube and the second switching tube form a first bridge arm of a half-bridge inverter circuit, one end of a high-frequency transformer is connected to the midpoint position of the first capacitor and the midpoint position of the second capacitor, the other end of the high-frequency transformer is connected with a common connection end of the first switching tube and the second switching tube, and a PWM controller is connected to the input end of the first bridge arm and used for controlling alternate conduction of the first switching tube and the second switch.
2. The voltage regulator for switching power supply of claim 1, further comprising a feedback module comprising a resistor divider, an error amplifier, and a comparator, the resistor divider being comprised of a first resistor and a second resistor.
3. The voltage regulator for switching power supply of claim 1, further comprising a filter circuit, said filter circuit comprising an inductor and a third capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322553429.0U CN221283061U (en) | 2023-09-20 | 2023-09-20 | Voltage stabilizing device for switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322553429.0U CN221283061U (en) | 2023-09-20 | 2023-09-20 | Voltage stabilizing device for switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221283061U true CN221283061U (en) | 2024-07-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322553429.0U Active CN221283061U (en) | 2023-09-20 | 2023-09-20 | Voltage stabilizing device for switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221283061U (en) |
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2023
- 2023-09-20 CN CN202322553429.0U patent/CN221283061U/en active Active
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