CN211830603U - Switch voltage reduction module with wide input voltage - Google Patents
Switch voltage reduction module with wide input voltage Download PDFInfo
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- CN211830603U CN211830603U CN202020608830.3U CN202020608830U CN211830603U CN 211830603 U CN211830603 U CN 211830603U CN 202020608830 U CN202020608830 U CN 202020608830U CN 211830603 U CN211830603 U CN 211830603U
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Abstract
The utility model relates to a step-down circuit field discloses a wide input voltage's switch step-down module, including voltage input end, filter circuit, switching device, current regulation circuit, output voltage regulating circuit, control chip, fifth resistance, the fourth diode, the third diode, first inductance and DC power supply, filter circuit includes second electric capacity and third electric capacity, switching device includes the MOS pipe, current regulation circuit includes second resistance and third resistance, output voltage regulating circuit includes eleventh resistance, the twelfth resistance, thirteenth resistance and fourteenth resistance, voltage input end respectively with the positive pole of second electric capacity, the one end of third electric capacity, the one end of fifth resistance and the drain electrode of MOS pipe are connected, the negative pole of second electric capacity and the other end of third electric capacity are connected, the grid of MOS pipe is connected with control chip's first pin. The utility model discloses have wide input voltage, steady voltage efficiency higher, can be according to the input voltage adjustment in order to reach the highest output efficiency.
Description
Technical Field
The utility model relates to a step-down circuit field, in particular to wide input voltage's switch voltage reduction module.
Background
The conventional method for converting alternating current commercial power into low-voltage direct current is to use a transformer to reduce voltage and then rectify and filter, and when the limitation of factors such as area and cost is caused, the simplest and practical method is to use a capacitance voltage reduction type power supply. When the capacitor is adopted for voltage reduction, a proper capacitor is selected according to the current magnitude of the load and the working frequency of the alternating current, but not according to the voltage and the power of the load. The traditional voltage reduction circuit has the advantages of smaller input voltage range, low voltage stabilization efficiency and low voltage output efficiency.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a switch step-down module that has wide input voltage, steady voltage efficiency is higher, can adjust in order to reach the wide input voltage of highest output efficiency according to input voltage.
The utility model provides a technical scheme that its technical problem adopted is: the switch voltage reduction module comprises a voltage input end, a filter circuit, a switch device, a current regulation circuit, an output voltage regulation circuit, a control chip, a fifth resistor, a fourth diode, a third diode, a first inductor and a direct current power supply, wherein the filter circuit comprises a second capacitor and a third capacitor, the switch device comprises an MOS (metal oxide semiconductor) tube, the current regulation circuit comprises a second resistor and a third resistor, the output voltage regulation circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor and a fourteenth resistor, the voltage input end is respectively connected with the anode of the second capacitor, one end of the third capacitor, one end of the fifth resistor and the drain electrode of the MOS tube, the cathode of the second capacitor is connected with the other end of the third capacitor, the grid electrode of the MOS tube is connected with a first pin of the control chip, and the source electrode of the MOS tube is respectively connected with an eighth pin of the control chip, One end of a second resistor, one end of a third resistor and a cathode of a third diode are connected, a second pin of the control chip is respectively connected with the other end of the fifth resistor and the cathode of a fourth diode, a third pin of the control chip is respectively connected with one end of the twelfth resistor and one end of a thirteenth resistor, a fourth pin of the control chip is respectively connected with one end of the eleventh resistor and one end of the fourteenth resistor, the other end of the second resistor is respectively connected with a sixth pin of the control chip, a seventh pin of the control chip and one end of a first inductor, the other end of the eleventh resistor and an anode of the third diode are both grounded, the other end of the thirteenth resistor is connected with the other end of the fourteenth resistor, and an anode of the fourth diode is respectively connected with the other end of the twelfth resistor, the other end of the first inductor and a direct current power supply, the input voltage of the voltage input end is 8-120V.
The switch voltage-reducing module of the wide input voltage further comprises a second voltage-regulator tube, a fourth capacitor and a seventh capacitor, the second pin of the control chip is respectively connected with the cathode of the second voltage-regulator tube, one end of the fourth capacitor and one end of the seventh capacitor, and the anode of the second voltage-regulator tube is respectively connected with the other end of the fourth capacitor, the other end of the seventh capacitor and the other end of the thirteenth resistor.
The switch voltage-reducing module of the wide input voltage further comprises a fifth capacitor, the positive pole of the fifth capacitor is connected with the other end of the first inductor, and the negative pole of the fifth capacitor is grounded.
The switch voltage-reducing module of the wide input voltage further comprises a sixth capacitor, one end of the sixth capacitor is connected to the anode of the fifth capacitor, and the other end of the sixth capacitor is grounded.
The switch voltage-reducing module of the wide input voltage, further comprises an eighth resistor, one end of the eighth resistor is connected to one end of the sixth capacitor, and the other end of the eighth resistor is grounded.
In the switch voltage-reducing module with wide input voltage, the model of the control chip is H6201.
In the switch voltage reduction module with wide input voltage of the present invention, the model of the third diode is SS 515.
Implement the utility model discloses a wide input voltage's switch step-down module has following beneficial effect: owing to be equipped with voltage input end, filter circuit, switching device, current regulation circuit, output voltage regulation circuit, control chip, fifth resistance, the fourth diode, the third diode, first inductance and DC power supply, filter circuit includes second electric capacity and third electric capacity, switching device includes the MOS pipe, current regulation circuit includes second resistance and third resistance, voltage input end's input voltage is 8V-120V, control chip establishes ties in whole buck circuit, plays the effect of control switching device break-make frequency in buck circuit, the utility model discloses have wide input voltage, steady voltage efficiency is higher, can adjust in order to reach highest output efficiency according to input voltage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of an embodiment of a wide input voltage buck switching module according to the present invention.
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 obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the embodiment of the switch voltage-reducing module with wide input voltage of the present invention, the schematic structural diagram of the switch voltage-reducing module with wide input voltage is shown in fig. 1. In fig. 1, the wide input voltage switching buck module includes a voltage input terminal VIN, a filter circuit 11, a switching device 12, a current regulation circuit 13, an output voltage regulation circuit 14, a control chip U1, a fifth resistor R5, a fourth diode D4, a third diode D3, a first inductor L1, and a dc power supply +12V, where the filter circuit 11 includes a second capacitor C2 and a third capacitor C3, the switching device 12 includes a MOS transistor Q2, the current regulation circuit 13 includes a second resistor R2 and a third resistor R3, the output voltage regulation circuit 14 includes an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, and a fourteenth resistor R14, the voltage input terminal VIN is connected to an anode of the second capacitor C2, one end of the third capacitor C3, one end of the fifth resistor R5 and a drain of the MOS transistor Q2, a cathode of the second capacitor C2 and the other end of the third capacitor C5 are connected to a gate of the MOS transistor Q2, a source of the MOS transistor Q2 is connected to an eighth pin of the control chip U1, one end of the second resistor R2, one end of the third resistor R3 and a cathode of the third diode D3, a second pin of the control chip U1 is connected to the other end of the fifth resistor R5 and a cathode of the fourth diode D4, a third pin of the control chip U1 is connected to one end of the twelfth resistor R12 and one end of the thirteenth resistor R13, a fourth pin of the control chip U1 is connected to one end of the eleventh resistor R11 and one end of the fourteenth resistor R14, the other end of the second resistor R2 is connected to a sixth pin of the control chip U1, a seventh pin of the control chip U1 and one end of the first inductor L1, the other end of the eleventh resistor R11 and an anode of the third diode D3 are grounded, the other end of the thirteenth resistor R13 is connected to the other end of the fourth resistor R14, and the other end of the fourth diode D8653 are connected to an anode of the twelfth resistor R8653, The other end of the first inductor L1 is connected to +12V of the dc power supply, and the input voltage of the voltage input terminal VIN is 8V-120V.
In this embodiment, the model number of the third diode D3 is SS 515.
The switching step-down module with wide input voltage is a switching step-down module, and mainly comprises electronic devices such as a switching device 12, a one-way conduction device (such as a diode), an inductor, a capacitor, a voltage regulator tube, a control chip U1 and the like. In this embodiment, the model of the control chip U1 is H6201. The control chip U1 is connected in series in the entire voltage-reducing circuit, and plays a role in controlling the on-off frequency of the switching device 12 in the voltage-reducing circuit. Under normal working voltage, the on-off frequency can be stably controlled at 140KHz, and under the condition of light load, the switching frequency can be automatically reduced to obtain high conversion efficiency. The switch voltage reduction module with wide input voltage has the characteristic of wide input voltage, and the voltage range can be 8V-120V; the highest voltage stabilizing efficiency can reach 98 percent; the working frequency is 140KHz, and can be adjusted according to the input voltage to achieve the highest output efficiency.
In actual circuit operation, the state in the circuit is not always stable, such as: at the moment of switching in the input voltage, the transient voltage in the circuit is relatively large, which may affect the circuit and even damage the circuit device. The filter circuit 11 is added to protect the circuit and plays a role of filtering in the circuit. Meanwhile, an overcurrent protection safety device can be added in the front-end circuit of the filter circuit 11 to improve the safety of the module.
The switching device 12 is a switching device of the whole module, is realized by a MOS transistor Q2, and is used to control the on/off of the circuit by matching with a DRV pin of the upper control chip U1 to output a PWM waveform, which is an important device in the main power loop. The value of the input voltage can be effectively reduced by the action of the switching device 12. The step-down is regulated according to the DRV pin output PWM waveform of the control chip U1, and the required step-down value can be obtained by adjusting the duty ratio of the PWM waveform.
The second resistor R2 and the third resistor R3 are maximum current adjusting resistors in the module, and the maximum output current needs to be connected between the VSP pin and the VSN pin of the control chip U1, that is, the current can be adjusted by adjusting the resistance values of the second resistor R2 and the third resistor R3. The maximum output current value is set by the formula: i _ Max ═ VCS ═ R2 ═ R3/(R2+ R3).
The eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13 and the fourteenth resistor R14 are adjusting resistors of output voltage, pins FB1 and FB2 connected with the resistors are sampling pins of positive and negative ends of output feedback voltage of the control chip U1, PWM output inside the control chip U1 can be adjusted by changing the values of the adjusting resistors, and required step-down value is achieved through different duty ratio, so that required output voltage is obtained. When setting, ensuring that R12 is R13, R11 is R14; and a 1% accuracy of the resistance needs to be selected. The regulating resistance may set the output voltage by the formula: v _ OUT ═ R11+ R13)/R11 × VFB, where VFB has a typical value of 380 mv.
The switching process of the MOS transistor Q2 mainly consists of two power loops. After the module is powered on, when the voltage of a VDD pin of a control chip U1 reaches 4.5V, a DRV pin drives an MOS transistor Q2 to be opened, the voltage drop of a resistor between a VSP pin and a VSN pin is detected, the inductance current is linearly increased, the voltage drop of the resistor between the VSP pin and the VSN pin is also linearly increased upwards, and when the voltage drop of the resistor between the VSP pin and the VSN pin reaches 0.15V, the DRV pin drives the MOS transistor Q2 to be closed. When the MOS transistor Q2 is turned on, the loop is formed as follows: the MOS transistor Q2 flows through the second resistor R2, the third resistor R3, and through the first inductor L1 to the output. When the MOS transistor Q2 is turned off, the first inductor L1 discharges current through the fourth diode (freewheeling diode) D4 and through the output load. These two are the main power loops.
In this embodiment, the switching step-down module for wide input voltage further includes a second voltage regulator D2, a fourth capacitor C4, and a seventh capacitor C7, a second pin of the control chip U1 is connected to a cathode of the second voltage regulator D2, one end of the fourth capacitor C4, and one end of the seventh capacitor C7, respectively, and an anode of the second voltage regulator D2 is connected to the other end of the fourth capacitor C4, the other end of the seventh capacitor C7, and the other end of the thirteenth resistor R13, respectively.
In this embodiment, the wide input voltage switching voltage dropping module further includes a fifth capacitor C5, an anode of the fifth capacitor C5 is connected to the other end of the first inductor L1, and a cathode of the fifth capacitor C5 is grounded to GND.
In this embodiment, the wide input voltage switching buck module further includes a sixth capacitor C6, one end of the sixth capacitor C6 is connected to the anode of the fifth capacitor C5, and the other end of the sixth capacitor C6 is grounded to GND.
In this embodiment, the wide input voltage switching buck module further includes an eighth resistor R8, one end of the eighth resistor R8 is connected to one end of the sixth capacitor C6, and the other end of the eighth resistor R8 is grounded to GND.
In a word, in this embodiment, the input voltage of voltage input end VIN is 8V-120V, and control chip U1 establishes ties in whole step-down circuit, plays the effect of control switch device 12 break-make frequency in step-down circuit, the utility model discloses have wide input voltage, steady voltage efficiency is higher, can adjust in order to reach the highest output efficiency according to input voltage.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A wide input voltage switch voltage reduction module is characterized by comprising a voltage input end, a filter circuit, a switch device, a current regulation circuit, an output voltage regulation circuit, a control chip, a fifth resistor, a fourth diode, a third diode, a first inductor and a direct current power supply, wherein the filter circuit comprises a second capacitor and a third capacitor, the switch device comprises an MOS (metal oxide semiconductor) tube, the current regulation circuit comprises a second resistor and a third resistor, the output voltage regulation circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor and a fourteenth resistor, the voltage input end is respectively connected with the anode of the second capacitor, one end of the third capacitor, one end of the fifth resistor and the drain electrode of the MOS tube, the cathode of the second capacitor is connected with the other end of the third capacitor, and the grid electrode of the MOS tube is connected with a first pin of the control chip, a source electrode of the MOS transistor is connected to an eighth pin of the control chip, one end of the second resistor, one end of the third resistor and a cathode of the third diode, a second pin of the control chip is connected to the other end of the fifth resistor and a cathode of the fourth diode, a third pin of the control chip is connected to one end of the twelfth resistor and one end of the thirteenth resistor, a fourth pin of the control chip is connected to one end of the eleventh resistor and one end of the fourteenth resistor, the other end of the second resistor is connected to a sixth pin of the control chip, a seventh pin of the control chip and one end of the first inductor, the other end of the eleventh resistor and an anode of the third diode are grounded, the other end of the thirteenth resistor is connected to the other end of the fourteenth resistor, and an anode of the fourth diode is connected to the other end of the twelfth resistor, the anode of the twelfth resistor, the cathode of the twelfth resistor, the thirteenth resistor, the fourth diode, The other end of the first inductor is connected with a direct current power supply, and the input voltage of the voltage input end is 8-120V.
2. The wide input voltage switching buck module according to claim 1, further comprising a second voltage regulator tube, a fourth capacitor and a seventh capacitor, wherein a second pin of the control chip is connected to a cathode of the second voltage regulator tube, one end of the fourth capacitor and one end of the seventh capacitor, respectively, and an anode of the second voltage regulator tube is connected to the other end of the fourth capacitor, the other end of the seventh capacitor and the other end of the thirteenth resistor, respectively.
3. The wide input voltage switching buck module of claim 2, further comprising a fifth capacitor, wherein an anode of the fifth capacitor is connected to the other end of the first inductor, and a cathode of the fifth capacitor is grounded.
4. The wide input voltage switching buck module of claim 3, further comprising a sixth capacitor, wherein one end of the sixth capacitor is connected to the positive electrode of the fifth capacitor, and the other end of the sixth capacitor is grounded.
5. The wide-input-voltage switching buck module according to claim 4, further comprising an eighth resistor, wherein one end of the eighth resistor is connected to one end of the sixth capacitor, and the other end of the eighth resistor is grounded.
6. The wide-input-voltage switching buck module according to any one of claims 1 to 5, wherein the control chip is H6201 in model number.
7. The wide input voltage switching buck module of any one of claims 1 to 5, wherein the third diode is type SS 515.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020608830.3U CN211830603U (en) | 2020-04-21 | 2020-04-21 | Switch voltage reduction module with wide input voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020608830.3U CN211830603U (en) | 2020-04-21 | 2020-04-21 | Switch voltage reduction module with wide input voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211830603U true CN211830603U (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020608830.3U Expired - Fee Related CN211830603U (en) | 2020-04-21 | 2020-04-21 | Switch voltage reduction module with wide input voltage |
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| Country | Link |
|---|---|
| CN (1) | CN211830603U (en) |
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2020
- 2020-04-21 CN CN202020608830.3U patent/CN211830603U/en not_active Expired - Fee Related
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Granted publication date: 20201030 |