CN218449863U - Reclosing power supply circuit - Google Patents
Reclosing power supply circuit Download PDFInfo
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- CN218449863U CN218449863U CN202222448084.8U CN202222448084U CN218449863U CN 218449863 U CN218449863 U CN 218449863U CN 202222448084 U CN202222448084 U CN 202222448084U CN 218449863 U CN218449863 U CN 218449863U
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Abstract
The utility model discloses a reclosing power supply circuit, it includes surge suppression circuit, rectifier circuit, step-down and filter circuit and the auxiliary circuit that links to each other in proper order with the three-phase input, the auxiliary circuit forms feedback loop through former limit feedback alternating current-direct current converting circuit, step-down and filter circuit include step-down circuit and filter circuit, step-down circuit includes field effect transistor Q1, field effect transistor Q1's drain electrode links to each other with rectifier circuit's output, diode D17 output voltage VDD is passed through to field effect transistor Q1's source electrode, parallel resistance R11 between field effect transistor Q1's grid and the drain electrode, parallelly connected diode D7 between field effect transistor Q1's grid and the source electrode, field effect transistor Q1's grid passes through diode D8 ground connection. The voltage is adjusted by switching on and off the mos tube, the voltage reduction circuit is arranged in front of the auxiliary circuit, the input of the power supply voltage is effectively improved, and the real power supply circuit design with high reliability and wide working voltage is realized.
Description
Technical Field
The utility model particularly relates to a reclosing power supply circuit.
Background
With the construction and the promotion of the smart grid, the prepayment electric energy meter is widely applied to a low-voltage distribution system as terminal equipment of the smart grid, and is used for controlling the switching-on or switching-off of a small reclosing circuit breaker; when the user continues to charge, the intelligent electric energy meter sends a closing signal through the charge control line, and the prepayment electric energy meter controls the small-sized reclosing circuit breaker to automatically close to switch on the user power supply.
The small reclosing circuit breaker matched with the current prepayment electric energy meter is a single-phase or three-phase four-wire circuit breaker, and part of manufacturers claim three-phase three-wire small reclosing, actually, the three-phase circuit breaker is assembled with a three-phase four-wire power supply controller, an external N pole is needed, the N pole of the controller is a lead welded on a circuit board, the lead is easily broken off when the low-voltage distribution box is installed, normal use of a product is affected, and the N wire cannot be removed by the three-phase three-wire small reclosing circuit.
The design of a three-phase three-wire miniature reclosing circuit breaker is mainly characterized in the design of a power circuit, for example, a Chinese patent CN211508929U discloses a power control circuit, which specifically discloses a rectification and anti-surge interference circuit, a switch control circuit, an AC-DC conversion circuit, a load end voltage detection circuit and an MCU which are connected in sequence, wherein the MCU is also connected with the switch control circuit; the switch control circuit also comprises a switch circuit and a control circuit, the rectification and anti-surge interference circuit, the switch circuit and the AC-DC conversion circuit are sequentially connected, and the MCU, the control circuit and the switch circuit are sequentially connected; the MCU drives the switch circuit to be switched on or switched off through the control circuit according to the load end voltage detected by the load end voltage detection circuit; the utility model discloses a power control circuit, opening and the disconnection of its on-off control circuit control AC-DC converting circuit, make power control circuit can be applicable to three-phase three-wire system or only the three-phase system of getting, it mainly is through energy storage capacitor C7's charge/discharge process, make whole power control circuit be in intermittent type formula power supply state, whole electrical power generating system's average power consumption has been reduced, but its operating voltage scope that can satisfy is comparatively limited, can not realize the requirement of broad voltage range, it uses B looks as the power benchmark simultaneously, can only satisfy A looks, C looks charge accuse signal control, B looks uncontrollable.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a reclosing power supply circuit.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a reclosing power supply circuit comprises a surge suppression circuit, a rectifying circuit, a voltage reduction and filtering circuit and an auxiliary circuit which are sequentially connected with a three-phase input, wherein the auxiliary circuit forms a feedback loop through a primary side feedback alternating current-direct current conversion circuit, the voltage reduction and filtering circuit comprises a voltage reduction circuit and a filtering circuit, the voltage reduction circuit comprises a field effect tube Q1, a drain electrode of the field effect tube Q1 is connected with an output end of the rectifying circuit, a source electrode of the field effect tube Q1 outputs voltage VDD through a diode D17, a resistor R11 is connected between a grid electrode and a drain electrode of the field effect tube Q1 in parallel, a diode D7 is connected between the grid electrode and the source electrode of the field effect tube Q1 in parallel, and the grid electrode of the field effect tube Q1 is grounded through a diode D8.
The surge suppression circuit comprises a plurality of piezoresistors, and at least one piezoresistor is connected in parallel between each phase of three-phase input.
The rectifying circuit comprises three branches formed by connecting two diodes in series, each branch is arranged in parallel, and the three-phase input is connected with the connecting node of the two diodes of each branch respectively.
The primary side feedback alternating current-direct current conversion circuit comprises a primary side feedback control chip U1, an S pin SW of the primary side feedback control chip U1 is connected with a primary coil winding of a transformer T1 of an auxiliary circuit, a pin FB of the primary side feedback control chip U1 is connected with a connecting node of a resistor R9 and a resistor R10 which are connected in series, the other end of the resistor R9 is connected with a secondary winding of the transformer T1, the other end of the resistor R10 is grounded, and a pin VDD of the primary side feedback control chip U1 is connected with the auxiliary winding of the transformer T1 through a resistor R8 and a diode D5 respectively.
The auxiliary circuit comprises a transformer T1, the transformer T1 comprises a primary winding, a secondary winding and an auxiliary winding, the auxiliary winding is used for providing working voltage of the primary side feedback alternating current-direct current conversion circuit, the primary winding is connected with the buffer circuit, and the secondary winding outputs voltage VCC through a diode D4.
The output terminal of the diode D4 is grounded through a plurality of capacitors.
The buffer circuit comprises a branch circuit formed by connecting a resistor R27, a resistor R6 and a capacitor C4 in parallel, one end of the branch circuit is connected with a voltage VDD, the other end of the branch circuit is connected with a diode D3 in series, and the buffer circuit is arranged between two ends of the primary coil in parallel.
The utility model has the advantages that: realize the regulation of voltage through the break-make of MOS pipe, and set up step-down circuit before auxiliary circuit, effectively promote mains voltage's input, realize the power supply circuit design of real high reliable wide operating voltage, and avoid power conditioning circuit sampling external MOS pipe to promote the input voltage scope and lead to the circuit design complicacy, defect with high costs, and avoided needing plus the not enough of radiator in order to reduce the temperature rise of MOS pipe, can realize A looks, B looks, the cost control signal control of C looks arbitrary completely, it is more convenient that the user uses.
Drawings
Fig. 1 is a schematic block diagram of the present invention.
Fig. 2 is a first schematic circuit diagram of the present invention.
Fig. 3 is a second schematic circuit diagram of 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 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 efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, back, 8230; \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
As shown in the figure, the utility model discloses a reclosing power supply circuit, it includes surge suppression circuit, rectifier circuit, step-down and filter circuit and the auxiliary circuit that links to each other in proper order with the three-phase input, the auxiliary circuit forms feedback loop through former limit feedback alternating current-direct current converting circuit, step-down and filter circuit include step-down circuit and filter circuit, step-down circuit includes field effect transistor Q1, field effect transistor Q1's drain electrode links to each other with rectifier circuit's output, diode D17 output voltage VDD is passed through to field effect transistor Q1's source electrode, shunt resistance R11 between field effect transistor Q1's grid and the drain electrode, shunt diode D7 between field effect transistor Q1's grid and the source electrode, field effect transistor Q1's grid passes through diode D8 ground connection. Meanwhile, the output end of the diode D17 is grounded through the electrolytic capacitor C2, so that the filtering effect is realized, the output voltage VDD is adjusted through the on-off of the MOS tube, and the design of a wider voltage input range can be realized.
The surge suppression circuit comprises a plurality of piezoresistors, and at least one piezoresistor is connected in parallel between each phase of three-phase input, so that the surge protection effect between each phase is achieved.
Adopt three-phase three-wire power supply circuit design simultaneously, the wiring is convenient more reliable, avoids the small-size reclosing circuit breaker three-phase of present three-phase four-wire can not lack the N line, installs inconvenient moreover, the poor defect of reliability.
The rectifier circuit comprises three branches formed by connecting two diodes in series, each branch is arranged in parallel, and the three-phase input is connected with the connecting node of the two diodes of each branch respectively, so that the rectifier effect is achieved.
The primary side feedback alternating current-direct current conversion circuit comprises a primary side feedback control chip U1, an S pin SW of the primary side feedback control chip U1 is connected with a primary coil winding of a transformer T1 of an auxiliary circuit, a pin FB of the primary side feedback control chip U1 is connected with a connection node of a resistor R9 and a resistor R10 which are connected in series, the other end of the resistor R9 is connected with a secondary winding of the transformer T1, the other end of the resistor R10 is grounded and used for adjusting output voltage VCC, and a pin VDD of the primary side feedback control chip U1 is connected with the auxiliary winding of the transformer T1 through a resistor R8 and a diode D5 respectively.
The auxiliary circuit comprises a transformer T1, the transformer T1 comprises a primary winding, a secondary winding and an auxiliary winding, the auxiliary winding is used for providing working voltage of the primary side feedback alternating current-direct current conversion circuit, the primary winding is connected with the buffer circuit, and the secondary winding outputs voltage VCC through a diode D4.
And the output end of the diode D4 is grounded through a plurality of capacitors for filtering.
The buffer circuit comprises a branch circuit formed by connecting a resistor R27, a resistor R6 and a capacitor C4 in parallel, one end of the branch circuit is connected with a voltage VDD, the other end of the branch circuit is connected with a diode D3 in series, and the buffer circuit is arranged between two ends of the primary coil in parallel.
The examples should not be construed as limiting the present invention, but any modifications made based on the spirit of the present invention should be within the scope of the present invention.
Claims (7)
1. A reclosing power supply circuit which characterized in that: the voltage reduction and filtering circuit comprises a field effect tube Q1, a drain electrode of the field effect tube Q1 is connected with an output end of the rectifying circuit, a source electrode of the field effect tube Q1 outputs voltage VDD through a diode D17, a resistor R11 is connected in parallel between a grid electrode and a drain electrode of the field effect tube Q1, a diode D7 is connected in parallel between the grid electrode and the source electrode of the field effect tube Q1, and a grid electrode of the field effect tube Q1 is grounded through a diode D8.
2. The reclosing power supply circuit of claim 1, wherein: the surge suppression circuit comprises a plurality of piezoresistors, and at least one piezoresistor is arranged between each phase of the three-phase input in parallel.
3. The reclosing power supply circuit of claim 1, wherein: the rectifying circuit comprises three branches formed by connecting two diodes in series, each branch is connected in parallel, and the three-phase input is connected with the connecting node of the two diodes of each branch.
4. The reclosing power supply circuit of claim 1, wherein: the primary side feedback alternating current-direct current conversion circuit comprises a primary side feedback control chip U1, an S pin SW of the primary side feedback control chip U1 is connected with a primary coil winding of a transformer T1 of an auxiliary circuit, a pin FB of the primary side feedback control chip U1 is connected with a connection node of a resistor R9 and a resistor R10 which are connected in series, the other end of the resistor R9 is connected with a secondary winding of the transformer T1, the other end of the resistor R10 is grounded, and a pin VDD of the primary side feedback control chip U1 is connected with the auxiliary winding of the transformer T1 through a resistor R8 and a diode D5 respectively.
5. The reclosing power supply circuit of claim 1, wherein: the auxiliary circuit comprises a transformer T1, the transformer T1 comprises a primary winding, a secondary winding and an auxiliary winding, the auxiliary winding is used for providing working voltage of the primary side feedback alternating current-direct current conversion circuit, the primary winding is connected with the buffer circuit, and the secondary winding outputs voltage VCC through a diode D4.
6. The reclosing power supply circuit of claim 5, wherein: the output terminal of the diode D4 is grounded through a plurality of capacitors.
7. The reclosing power supply circuit of claim 5, wherein: the buffer circuit comprises a branch formed by connecting a resistor R27, a resistor R6 and a capacitor C4 in parallel, one end of the branch is connected with a voltage VDD, the other end of the branch is connected with a diode D3 in series, and the buffer circuit is arranged between two ends of the primary coil in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222448084.8U CN218449863U (en) | 2022-09-16 | 2022-09-16 | Reclosing power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222448084.8U CN218449863U (en) | 2022-09-16 | 2022-09-16 | Reclosing power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218449863U true CN218449863U (en) | 2023-02-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222448084.8U Active CN218449863U (en) | 2022-09-16 | 2022-09-16 | Reclosing power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218449863U (en) |
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2022
- 2022-09-16 CN CN202222448084.8U patent/CN218449863U/en active Active
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