CN213305282U - Power supply circuit of three-phase voltage and current protector - Google Patents
Power supply circuit of three-phase voltage and current protector Download PDFInfo
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- CN213305282U CN213305282U CN202022606272.XU CN202022606272U CN213305282U CN 213305282 U CN213305282 U CN 213305282U CN 202022606272 U CN202022606272 U CN 202022606272U CN 213305282 U CN213305282 U CN 213305282U
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Abstract
The utility model relates to a three-phase voltage current protector's power supply circuit, including resistance R1 ~ R8, diode D1 ~ D8, piezo-resistor RV1 ~ RV3, electric capacity C1 ~ C4, transient suppression diode ZD1 ~ ZD2, zener diode ZD3, MOS pipe Q1, inductance L1, power chip IC1, three-phase voltage current protector's power supply circuit adopts the power chip IC1+ MOS pipe step-down that uses the model to be SM7075P as the core, adopt the power switch chip of current mode PWM control mode, integrated high-pressure starting circuit and high-voltage power tube, realize the power supply technical scheme of high price/performance ratio, and provided the excess temperature, overcurrent, excessive pressure, the perfect protect function such as under-voltage, the reliability of power supply circuit work has been guaranteed. The utility model discloses the whole components and parts of power supply circuit are small in quantity, connect simply, and this power supply circuit can still can export required direct current operating voltage for the within range of 50V ~ 450V in outside three-phase electricity L1 ~ L3 looks voltage, when three-phase voltage fluctuation is great promptly, power supply circuit still can normally work.
Description
Technical Field
The utility model relates to a low-voltage apparatus especially relates to a three-phase voltage current protector's power supply circuit.
Background
The three-phase voltage current protector is a monitoring and protecting instrument for multifunctional three-phase power supply system or three-phase electric equipment, and integrates three-phase voltage display, overvoltage protection, undervoltage protection, open-phase protection (open-phase protection), voltage unbalance protection and phase sequence protection (phase error protection). The power module is an important circuit of the three-phase voltage and current protector for supplying power to each module, and the power module of the conventional three-phase voltage and current protector has the problem of narrow input voltage range, so that when the three-phase voltage fluctuates greatly, the power module cannot work normally, and the monitoring and protection of a three-phase power supply cannot be realized; and the existing power module has many components and complex circuit connection, and the production cost of the three-phase voltage and current protector is increased.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a power circuit of a three-phase voltage/current protector with wide voltage input range, few components, and simple connection.
In order to achieve the above purpose, the present invention adopts a power circuit of a three-phase voltage current protector, which comprises resistors R-R, diodes D-D, piezoresistors RV-RV, capacitors C-C, transient suppressor diodes ZD-ZD, zener diode ZD, MOS transistor Q, inductor L, and power chip IC, wherein the resistors R, diodes D, and diodes D are connected in series in sequence, one end of the resistor R, and one end of the resistor R are respectively connected with external three-phase power, the cathode of the diode D, and the cathode of the diode D are connected, one end of the piezoresistor RV is connected with the other end of the resistor R, the other end of the resistor RV1, the other end of the resistor RV2 and the other end of the resistor RV3 are connected in common, the capacitor C1 and the capacitor C2 are connected in series, the resistor R4 and the resistor R5 are connected in series, the resistor R5, the transient suppression diode ZD 5 and the transient suppression diode ZD 5 are sequentially connected in series, the cathode of the diode D5 is respectively connected with one end of the capacitor C5, one end of the resistor R5 and the drain of the MOS tube Q5, the other end of the capacitor C5 is connected with the other end of the resistor R5, one end of the capacitor C5, one end of the resistor R5 and the anode of the transient suppression diode ZD 5 are all grounded, the cathode of the transient suppression diode ZD 5 is respectively connected with the cathode of the Zener diode ZD 5 and the gate of the MOS tube Q5, the anode of the Zener diode ZD 5 is respectively connected with the source of the power supply IC 5, the drain of the capacitor C5 and the, the second pin of the power chip IC1 is connected with one end of the capacitor C3 and the cathode of the diode D7, the anode of the diode D8 and one end of the capacitor C4 are all grounded, the fifth pin, the sixth pin, the seventh pin and the eighth pin of the power chip IC1 are all connected with one end of the inductor L1, the other end of the inductor L1 is connected with one end of the resistor R8, the other end of the resistor R8 is grounded, and the two ends of the resistor R8 output direct current working voltage.
The utility model discloses the model that sets up further power chip IC1 is SM 7075P.
This practicality further sets up to the both ends output direct current operating voltage of resistance R8 and is + 18V.
The power supply circuit of the three-phase voltage and current protector adopts the power supply chip IC1+ MOS tube voltage reduction with the model number of SM7075P as the core, adopts the power switch chip with the current mode PWM control mode, integrates the high-voltage starting circuit and the high-voltage power tube, realizes the power supply technical scheme with high cost performance, provides perfect protection functions of over-temperature, over-current, over-voltage, under-voltage and the like, ensures the reliability of the work of the power supply circuit, provides stable voltage for the input end of the SM7075P model of the power supply chip IC1 after the three-phase voltage is driven by current limiting, rectifying, filtering and voltage stabilizing and the MOS tube, controls and outputs a direct current stabilized voltage supply through the power supply chip IC1, and a piezoresistor is used for protecting the overvoltage of each phase, the utility model discloses the power supply circuit has few integral components and is simple to connect, and can still output the required direct current working voltage in the range that the phase voltage of the external three-phase L1-L3 is 50V-450, namely, when the three-phase voltage fluctuation is large (the power supply circuit has the advantage of wide voltage input), the power supply circuit can still work normally.
Drawings
Fig. 1 is a schematic circuit diagram according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the present invention is a power supply circuit of a three-phase voltage-current protector, including resistors R1 to R8, diodes D1 to D8, piezoresistors RV1 to RV3, capacitors C1 to C4, transient suppression diodes ZD1 to ZD2, zener diode ZD3, MOS transistor Q1, inductor L1, and power chip IC1, where the model of the power chip IC1 is SM7075P, the resistors R1, diode D1, and diode D2 are connected in series in sequence, the resistors R2, diode D3, and diode D4 are connected in series in sequence, the resistors R3, diode D5, and diode D5 are connected in series in sequence, one end of the resistor R5 are connected to external three-phase power (L5, and the other end of the resistor R5, the cathode of the diode D5, the piezoresistor RV 5, the other end of the piezoresistor R5 is connected to the other end of the resistor R5, one end of a voltage dependent resistor RV3 is connected with the other end of a resistor R5, the other end of the resistor RV1, the other end of the resistor RV2 and the other end of a resistor RV3 are connected in common, a capacitor C1 and a capacitor C2 are connected in series, a resistor R2 and a resistor R2 are connected in series, a resistor R2, a transient suppression diode ZD2 and a transient suppression diode ZD2 are sequentially connected in series, the cathode of the diode D2 is respectively connected with one end of the capacitor C2, one end of the resistor R2 and the drain of the MOS tube Q2, the other end of the capacitor C2 is connected with the other end of the resistor R2, one end of the capacitor C2, the anode of the transient suppression diode ZD2 and the anode of the transient suppression diode ZD2 are all grounded, the cathode of the transient suppression diode ZD2 is respectively connected with the cathode of the Zener diode ZD2 and the fourth pin of the capacitor C2 and the diode ZD2 are connected in, diode D7 and electric capacity C4 are established ties, the second pin of power chip IC1 is connected the one end of electric capacity C3 and the negative pole of diode D7 respectively, and the positive pole of diode D8 and the one end of electric capacity C4 are all grounded, the fifth pin, the sixth pin, the seventh pin, the eighth pin of power chip IC1 all connect the one end of inductance L1, and the other end connection resistance R8 of inductance L1, the other end ground connection of resistance R8, the both ends output direct current operating voltage of resistance R8 is + 18V.
In addition to the above embodiments, there are also other embodiments of the present invention, and those skilled in the art can make various corresponding changes and modifications according to the present invention without departing from the spirit and scope of the present invention, and those changes and modifications are equivalent to the technical solutions in the present patent, and then those corresponding changes and modifications are all within the scope of the appended claims.
Claims (3)
1. A power supply circuit of a three-phase voltage current protector is characterized in that: the power supply circuit comprises resistors R1-R8, diodes D1-D8, piezoresistors RV 1-RV 3, capacitors C1-C4, transient suppression diodes ZD 1-ZD 2, a zener diode ZD3, a MOS transistor Q1, an inductor L1 and a power supply chip IC1, wherein the resistors R1, the diode D1 and the diode D2 are sequentially connected in series, the resistors R2, the diode D3 and the diode D4 are sequentially connected in series, the resistors R3, the diode D5 and the diode D6 are sequentially connected in series, one end of the resistor R1 and one end of the resistor R1 are respectively connected with an external three-phase power, the cathode of the diode D1 and the cathode of the diode D1 are connected, one end of the resistor RV1 is connected with the other end of the resistor R1, one end of the piezoresistor RV1 is connected with the other end of the piezoresistor R1 and the other end of the piezoresistors RV1 and the resistor RV1 are connected with the common ground, a capacitor C1 and a capacitor C2 are connected in series, a resistor R4 and a resistor R5 are connected in series, a resistor R6, a resistor R7, a transient suppression diode ZD1 and a transient suppression diode ZD1 are connected in series in sequence, the cathode of the diode D1 is respectively connected with one end of the capacitor C1, one end of the resistor R1 and the drain of the MOS transistor Q1, the other end of the capacitor C1 is connected with the other end of the resistor R1, one end of the capacitor C1, one end of the resistor R1 and the anode of the transient suppression diode ZD1 are all grounded, the cathode of the transient suppression diode ZD1 is respectively connected with the cathode of the zener diode 1 and the gate of the MOS transistor Q1, the anode of the zener diode ZD1 is respectively connected with the source of the MOS transistor Q1 and the fourth pin of the power chip IC1, the capacitor C1 and the diode D1 are connected in series, the cathode of the diode ZD1 and the second pin of the power chip IC1 are respectively connected with the cathode of the capacitor C1 and, the anode of the diode D8 and one end of the capacitor C4 are all grounded, the fifth pin, the sixth pin, the seventh pin and the eighth pin of the power chip IC1 are all connected with one end of the inductor L1, the other end of the inductor L1 is connected with one end of the resistor R8, the other end of the resistor R8 is grounded, and two ends of the resistor R8 output direct-current working voltage.
2. A power supply circuit for a three-phase voltage current protector according to claim 1, characterized by: the model of the power chip IC1 is SM 7075P.
3. A power supply circuit for a three-phase voltage current protector according to claim 1 or 2, characterized in that: the output direct-current working voltage at two ends of the resistor R8 is + 18V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022606272.XU CN213305282U (en) | 2020-11-12 | 2020-11-12 | Power supply circuit of three-phase voltage and current protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022606272.XU CN213305282U (en) | 2020-11-12 | 2020-11-12 | Power supply circuit of three-phase voltage and current protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213305282U true CN213305282U (en) | 2021-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022606272.XU Active CN213305282U (en) | 2020-11-12 | 2020-11-12 | Power supply circuit of three-phase voltage and current protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213305282U (en) |
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2020
- 2020-11-12 CN CN202022606272.XU patent/CN213305282U/en active Active
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