CN214205336U - Direct current voltage reduction circuit - Google Patents
Direct current voltage reduction circuit Download PDFInfo
- Publication number
- CN214205336U CN214205336U CN202120111450.3U CN202120111450U CN214205336U CN 214205336 U CN214205336 U CN 214205336U CN 202120111450 U CN202120111450 U CN 202120111450U CN 214205336 U CN214205336 U CN 214205336U
- Authority
- CN
- China
- Prior art keywords
- chip
- diode
- direct current
- reduction circuit
- voltage reduction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Dc-Dc Converters (AREA)
- Protection Of Static Devices (AREA)
Abstract
The utility model provides a direct current step-down circuit, it includes chip SL3036H, electric capacity C27, resistance R27, R28, R29, diode D5, D6, D7, D8, inductance L7, protective tube P2 and output P0, chip SL 3036H's pin VDD connects input high voltage direct current power supply positive pole through resistance R27, and be connected with diode D5's negative pole, diode D5's positive pole and chip SL 3036H's pin VDD, chip SL 3036H's pin SR, VIN is connected with input high voltage direct current power supply positive pole respectively, diode D6's negative pole is connected with chip SL 3036H's pin VDD, diode D6's positive pole through protective tube P2 with direct current step-down circuit's output P0, diode D7's positive pole ground connection, the negative pole connects chip SL 6 3036H, VSEND 8, VSEND 3929's negative pole connects the output of direct current step-down circuit, direct current step-down circuit 0 connects ground. The utility model discloses a direct current step-down circuit has the advantage that security and reliability are high.
Description
Technical Field
The utility model relates to a circuit field especially relates to a direct current step-down circuit.
Background
The conventional DC-DC voltage reduction input voltage is difficult to exceed 50V, and the whole circuit is damaged once the high voltage is connected. And once the current is increased, serious heating can be caused, including induction heating, the power supply control IC generates heat seriously, and the ripple wave of the circuit is increased. And the conventional DC-DC circuit is not provided with an independent overvoltage protection circuit, and once the circuit fails, the high voltage can cause the load to burn. In the EMI block, the interference is often ignored, resulting in crosstalk of high-frequency interference signals to other devices. Safety and reliability are difficult to guarantee.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a direct current step-down circuit that security and reliability are high.
In the embodiment of the present invention, a dc voltage reduction circuit is provided, which includes a chip SL3036H, a capacitor C27, a resistor R27, a resistor R28, a resistor R29, a diode D5, a diode D6, an inductor L6, a fuse P6 and an output terminal P6, a pin VDD of the chip SL3036 6 is connected to the positive electrode of the high voltage dc power supply through the resistor R6 and is connected to the negative electrode of the diode D6, the positive electrode of the diode D6 is connected to the pin VDD of the chip SL3036 6, pins SR and VIN of the chip SL3036 6 are respectively connected to the positive electrode of the high voltage dc power supply, the negative electrode of the diode D6 is connected to the pin VDD of the chip SL3036 6, the positive electrode of the diode D6 is connected to the output terminal P6 of the dc voltage reduction circuit through the fuse P6, and the inductor L6 is connected to the pin FB 72 and the pin VSEN of the chip SL 6 through the resistor R6 and the resistor R6, the capacitor C27 is connected between the positive pole of the input high-voltage direct-current power supply and the ground, the positive pole of the diode D7 is grounded, the negative pole of the diode D7 is connected with the pins VSEND and VSEN of the chip SL3036H, the negative pole of the diode D8 is connected with the output end P0 of the direct-current voltage reduction circuit, and the positive pole of the diode D8 is grounded.
In the embodiment of the present invention, the dc voltage reduction circuit further includes resistors R30, R31, and capacitor C26, and pin VDD of chip SL3036H is connected to pins FB1, FB2, VCC of chip SL3036H through resistors R30, R31, and capacitor C26, respectively.
In the embodiment of the present invention, the dc voltage reduction circuit further includes a resistor R33, a capacitor C28, a capacitor C29, and a capacitor C30 connected in parallel between the anode of the diode D6 and the ground.
In the embodiment of the utility model provides an in, electric capacity C28 adopts solid-state electric capacity.
In the embodiment of the utility model provides an in, electric capacity C29, C30 adopt different specifications to adopt ceramic capacitor.
In an embodiment of the present invention, the dc voltage dropping circuit further includes a resistor R32 connected between the pin FB2 of the chip SL3036H and the ground.
In the embodiment of the present invention, the dc voltage reduction circuit further includes a capacitor C25 connected in parallel with the diode D5.
In the embodiment of the utility model provides an in, electric capacity C27 adopts CBB electric capacity.
In the embodiment of the utility model provides an in, inductance L7 adopts indisputable silicon aluminium inductance.
In the embodiment of the utility model provides an in, diode D8 adopts high-power stabilivolt.
Compared with the prior art, the DC voltage reduction circuit of the utility model adopts the high voltage-resistant power control chip SL3036H, the input voltage of the DC voltage reduction circuit is up to 120V, the DC voltage reduction circuit can meet the conditions of various high input voltages, and the application occasions are very wide; the inductor L7 needs a copper wire with the wire diameter of 0.7, and a ferrum silicon aluminum magnetic ring, so that the heat productivity is low, and the heat dissipation is good; by adopting the solid capacitor C28, the CBB capacitor C27 and the ceramic capacitors C29 and C30 with different specifications, the effects of low ripple wave and low EMI can be filtered; in the aspect of overvoltage protection, an independent hardware overvoltage protection mechanism is adopted, so that a high-power voltage regulator tube D8 and a protective tube P2 are matched with each other, and when a direct-current voltage reduction circuit has a problem, a rear-stage circuit can be effectively protected from being damaged by high voltage.
Drawings
Fig. 1 is a circuit diagram of a dc voltage reduction circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
As shown in fig. 1, in the embodiment of the present invention, a dc voltage reduction circuit is provided, which includes a power control chip U6, a capacitor C25, a capacitor C27, a capacitor C28, a capacitor C29, a capacitor C30, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a diode D5, a diode D6, a diode D7, a diode D8, an inductor L7, and a fuse P2. The direct current voltage reduction circuit is connected with an input high-voltage direct current power supply (48V +), and outputs a low-voltage direct current power supply (24V +) through an output end P0.
The power control chip U6 adopts a chip SL 3036H. The chip SL3036H is a switching buck DC-DC power supply chip supporting wide voltage input, and has the characteristics of low standby power consumption, high efficiency, low ripple, excellent bus voltage regulation rate and load regulation rate, and the like. The chip SL3036H supports large current output, the output current can reach more than 1.8A, and simultaneously supports output constant voltage.
Pin VDD of chip SL3036H is connected to the positive pole (48V +) of the input high-voltage dc power supply through resistor R27 and connected to the negative pole of diode D5, the positive pole of diode D5 is connected to pin VDD of chip SL3036H, and capacitor C25 is connected in parallel to diode D5. The pin VDD of the chip SL3036H is connected to the pins FB1, FB2 and VCC of the chip SL3036H through resistors R30, R31 and a capacitor C26. Pins SR and VIN of the chip SL3036H are respectively connected with the positive pole of the input high-voltage direct-current power supply. The cathode of the diode D6 is connected to the pin VDD of the chip SL3036H, the anode is connected to the output terminal P0 of the dc voltage reduction circuit through the fuse P2, and is also connected to the pin FB1 of the chip SL3036H through the resistor R29, and is also connected to the pin VSS of the chip SL3036H through the inductor L7, the resistor R32 is connected between the pin FB2 of the chip SL3036H and the ground, and the connection point of the inductor L7 and the pin VSS of the chip SL3036H is connected to the pins VSEND and VSEN of the chip SL3036H through the resistor R28. And the capacitor C27 is connected between the positive pole of the input high-voltage direct-current power supply and the ground. The resistor R33 and the capacitors C28, C29 and C30 are connected in parallel between the anode of the diode D6 and the ground. The anode of the diode D7 is grounded, and the cathode is connected to the pins VSEND and VSEN of the chip SL 3036H. The cathode of the diode D8 is connected with the output end P0 of the DC voltage reduction circuit, and the anode is grounded.
It should be noted that the capacitor C27 is a CBB capacitor, and is responsible for eliminating EMI interference signals generated by the circuit and preventing the signals from interfering with other electric devices. Inductor L7 adopts the sendust inductance for cooperation electric capacity C28 realizes LC filtering, adopts 0.7 mm's line footpath, and the electric current can reach 7A, and big line footpath is mainly in order to reduce the equivalent series resistance of inside, reduces the loss that produces because of the heat. Capacitor C28 adopts solid state capacitor, has fine high frequency characteristic, and the ESR is also very low, uses and can reach the effect of the low ripple of filtering on this circuit. The capacitors C29 and C30 adopt ceramic capacitors with different specifications and are used for filtering ripples of different frequency bands.
The diode D8 adopts a high-power voltage regulator tube which is matched with the protective tube P2 to realize the function of overvoltage protection, the voltage of the voltage regulator tube is selected according to different output voltages, the working principle is that when the voltage is too high, an internal PN junction can be automatically opened to stabilize the voltage, the PN junction adjusts the current flowing through the PN junction in order to stabilize the voltage, but the voltage is very high due to the fault of a power circuit, and the current flowing through the voltage regulator tube and the protective tube is very large at the moment, so that the protective tube is burnt, the output is cut off, and the current for a load is cut off, so that the load is protected.
In summary, the dc voltage reduction circuit of the present invention is adopted, and the high voltage resistant power control chip SL3036H is selected, the input voltage thereof is up to 120V, which can satisfy various high input voltage conditions, and the application occasions are very wide; the inductor L7 needs a copper wire with the wire diameter of 0.7, and a ferrum silicon aluminum magnetic ring, so that the heat productivity is low, and the heat dissipation is good; by adopting the solid capacitor C28, the CBB capacitor C27 and the ceramic capacitors C29 and C30 with different specifications, the effects of low ripple wave and low EMI can be filtered; in the aspect of overvoltage protection, an independent hardware overvoltage protection mechanism is adopted, so that a high-power voltage regulator tube D8 and a protective tube P2 are matched with each other, and when a direct-current voltage reduction circuit has a problem, a rear-stage circuit can be effectively protected from being damaged by high voltage.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A direct current voltage reduction circuit is characterized by comprising a chip SL3036H, a capacitor C27, a resistor R27, a resistor R28, a diode D28, a resistor D28, a protective tube P28 and an output end P28, wherein a pin VDD of the chip SL3036 28 is connected with an input high-voltage direct current power supply positive electrode through the resistor R28 and is connected with a negative electrode of the diode D28, a positive electrode of the diode D28 is connected with the pin VDD of the chip SL3036 28, pins SR and VIN of the chip SL3036 are respectively connected with the input high-voltage direct current power supply positive electrode, a negative electrode of the diode D28 is connected with the pin VDD of the chip SL3036 28, a positive electrode of the diode D28 is connected with the output end P28 of the direct current voltage reduction circuit through the protective tube P28, and an inductor L28 is connected with the pin FB 28 and the positive electrode of the chip VSS 28 through the resistor R28, the resistor S28, the input terminal VSEN 28 and the chip VSS 28, and the chip VSS 28 are respectively connected with the chip VSS 28, and the input terminal of the chip VSS 28, and the chip VSS 28. The anode of the diode D7 is grounded, the cathode is connected with pins VSEND and VSEN of the chip SL3036H, the cathode of the diode D8 is connected with the output end P0 of the direct current step-down circuit, and the anode is grounded.
2. The direct current voltage reduction circuit of claim 1, further comprising resistors R30, R31 and a capacitor C26, wherein the pin VDD of the chip SL3036H is connected to the pins FB1, FB2 and VCC of the chip SL3036H through resistors R30, R31 and a capacitor C26, respectively.
3. The dc voltage reduction circuit of claim 1, further comprising a resistor R33, capacitors C28, C29, and C30 connected in parallel between the anode of the diode D6 and ground.
4. The dc voltage reduction circuit of claim 3, wherein the capacitor C28 is a solid capacitor.
5. The DC voltage reduction circuit of claim 3, wherein the capacitors C29 and C30 are ceramic capacitors with different specifications.
6. The dc voltage reduction circuit of claim 1, further comprising a resistor R32 connected between a pin FB2 of the chip SL3036H and ground.
7. The dc voltage reduction circuit of claim 1, further comprising a capacitor C25 connected in parallel with a diode D5.
8. The dc voltage dropping circuit of claim 1, wherein the capacitor C27 is a CBB capacitor.
9. The dc voltage reduction circuit of claim 1, wherein the inductor L7 is a sendust inductor.
10. The dc voltage reduction circuit of claim 1, wherein the diode D8 is a high power regulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120111450.3U CN214205336U (en) | 2021-01-15 | 2021-01-15 | Direct current voltage reduction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120111450.3U CN214205336U (en) | 2021-01-15 | 2021-01-15 | Direct current voltage reduction circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214205336U true CN214205336U (en) | 2021-09-14 |
Family
ID=77636377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120111450.3U Active CN214205336U (en) | 2021-01-15 | 2021-01-15 | Direct current voltage reduction circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214205336U (en) |
-
2021
- 2021-01-15 CN CN202120111450.3U patent/CN214205336U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105226732B (en) | The draw-out power supply circuit of cable temperature monitoring device | |
| CN206759306U (en) | A kind of entire car controller power circuit | |
| CN107834832A (en) | A kind of voltage peak absorbing circuit | |
| CN104319910B (en) | A kind of power supply based on ultra-high-tension power transmission line takes can circuit | |
| CN214205336U (en) | Direct current voltage reduction circuit | |
| CN101064429A (en) | Burst current suppressing circuit and power supply equipment using the same | |
| CN201039531Y (en) | LED transformation drive circuit | |
| CN112019063A (en) | Power supply system with ultrahigh power density | |
| CN113381593B (en) | Front-end auxiliary circuit of high-power capacitive load instrument | |
| CN208522648U (en) | A kind of high power pfc circuit | |
| CN216311573U (en) | Stable transformer | |
| CN106410981A (en) | Busbar electricity getting circuit of high-voltage side of current transformer | |
| CN207947719U (en) | A kind of inverse-excitation type switch power-supply based on PN8130H | |
| CN216252552U (en) | Switching power supply circuit | |
| CN103457469B (en) | Anti-explosion voltage-stabilized power source | |
| CN212486395U (en) | Power supply system with ultrahigh power density | |
| CN212323992U (en) | Y-free capacitor switch power supply circuit for power industry products | |
| CN211018675U (en) | Flyback AC-DC constant current power supply box | |
| CN213402578U (en) | Induction electricity taking circuit and passive wireless temperature measuring device based on same | |
| CN110572019A (en) | wide-range, high-reliability and low-EMI flyback switching power supply | |
| CN213027803U (en) | Power supply circuit and power supply device | |
| CN211830567U (en) | Lightning protection filtering power supply circuit | |
| CN213186642U (en) | Full-voltage high-power-factor stroboflash-free lamp | |
| CN219576858U (en) | Power module and electronic equipment | |
| CN218071872U (en) | Ceiling spotlight and single-stage flyback voltage reduction absorption removal driving device thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |