CN212210864U - Ammeter power supply circuit and ammeter - Google Patents
Ammeter power supply circuit and ammeter Download PDFInfo
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- CN212210864U CN212210864U CN202020430061.2U CN202020430061U CN212210864U CN 212210864 U CN212210864 U CN 212210864U CN 202020430061 U CN202020430061 U CN 202020430061U CN 212210864 U CN212210864 U CN 212210864U
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Abstract
The utility model provides an ammeter power supply circuit and ammeter, wherein, ammeter power supply circuit includes rectification filter circuit, voltage regulating circuit, high frequency transformer, output rectifier circuit, output filter circuit and voltage feedback circuit, voltage regulating circuit exports to high frequency transformer after carrying out voltage regulation to high voltage direct current power according to voltage regulation signal, high frequency transformer carries out step-down conversion to voltage regulation's high voltage direct current power, export rectifier circuit exports to output filter circuit after rectifying second high frequency low voltage pulse signal through second secondary coil output second high frequency voltage pulse signal, output filter circuit filters rectified second high frequency low voltage pulse signal, obtain the low voltage direct current and export, voltage regulating circuit and then the size of the high frequency voltage pulse signal of regulating transformer output according to the voltage size of output rectifier circuit output, the conversion power is high, and the output voltage is ensured to be stable when the input voltage changes, so that the voltage stabilizing range is improved.
Description
Technical Field
The utility model belongs to the technical field of the ammeter, especially, relate to an ammeter power supply circuit and ammeter.
Background
With the increasing functions of the intelligent electric meter, the communication modes developed day by day are also rapidly applied to the intelligent electric meter, such as GPRS communication, carrier communication, wireless WIFI communication, ethernet communication, optical fiber communication and the like. The GPRS communication, the wireless WFIF communication, the Ethernet communication and the like have higher requirements on the power and the stability of the power supply, and the traditional linear power supply cannot meet the requirements of high conversion power, wide voltage stabilizing range and the like.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an ammeter power supply circuit aims at solving the problem that traditional linear power supply can't satisfy requirements such as conversion power height, steady voltage range width.
The utility model discloses a first aspect of the embodiment provides an ammeter power supply circuit, ammeter power supply circuit includes input rectification filter circuit, voltage regulation circuit, high frequency transformer, output rectifier circuit, output filter circuit and voltage feedback circuit;
the power input end of the input rectifying and filtering circuit inputs an alternating current power supply, the power output end of the input rectifying and filtering circuit, the primary coil of the high-frequency transformer and the voltage regulating circuit are sequentially connected in series to form a series loop, the secondary coil of the high-frequency ratio transformer is connected with the input end of the output rectifying circuit, the output end of the output rectifying circuit, the power input end of the output filtering circuit and the signal input end of the voltage feedback circuit are interconnected, and the signal output end of the voltage feedback circuit is connected with the signal end of the voltage regulating circuit;
the input rectification filter circuit is used for carrying out rectification filtering conversion on the alternating current power supply to obtain a high-voltage direct current power supply and outputting the high-voltage direct current power supply to the series loop;
the voltage feedback circuit is used for sampling the output voltage of the output rectifying circuit and outputting a voltage feedback signal to the voltage regulating circuit;
the voltage regulating circuit is used for regulating the voltage of the high-voltage direct-current power supply according to the voltage regulating signal and outputting the regulated voltage to the high-frequency transformer;
the high-frequency transformer is used for outputting a first high-frequency low-voltage pulse signal through a first secondary coil and outputting a second high-frequency voltage pulse signal through a second secondary coil after voltage reduction conversion is carried out on the high-voltage direct-current power supply after voltage regulation;
the output rectifying circuit is used for rectifying the second high-frequency low-voltage pulse signal and outputting the second high-frequency low-voltage pulse signal to the output filter circuit;
and the output filter circuit is used for filtering the rectified second high-frequency low-voltage pulse signal to obtain low-voltage direct current and outputting the low-voltage direct current.
In one embodiment, the voltage feedback circuit comprises a voltage sampling module, a voltage comparison module and an optical coupling feedback module;
the input end of the voltage sampling module is the signal input end of the voltage feedback circuit, the output end of the voltage sampling module is connected with the input end of the voltage comparison module, the output end of the voltage comparison module is connected with the input end of the optocoupler feedback module, and the output end of the optocoupler feedback module is the signal output end of the voltage feedback circuit;
the voltage sampling module is used for sampling the output voltage of the output rectifying circuit and feeding back a voltage sampling signal to the voltage comparison module;
the voltage comparison module is used for comparing the voltage sampling signal with a reference voltage, outputting a turn-on signal when the voltage of the voltage sampling signal is smaller than the reference voltage, and outputting a turn-off signal when the voltage of the voltage sampling signal is larger than the reference voltage;
the optical coupling feedback module is used for outputting the on signal and the off signal to the voltage regulating circuit in a feedback mode, so that the voltage regulating circuit can respectively carry out power supply conversion work or stop the power supply conversion work according to the on signal and the off signal.
In one embodiment, the voltage sampling module includes a first resistor and a second resistor;
the first end of the first resistor is the input end of the voltage sampling module, the second end of the first resistor is connected with the first end of the second resistor to form the output end of the voltage sampling module, and the second end of the second resistor is connected with the negative electrode of the input end of the output filter circuit.
In one embodiment, the voltage comparison module comprises a controllable voltage regulator, a third resistor, a first capacitor and a second capacitor;
the reference end of the controllable voltage-stabilizing source, the first end of the third resistor and the first end of the first capacitor are interconnected to form the input end of the voltage comparison module, the anode of the controllable voltage-stabilizing source is connected with the negative electrode of the input end of the output filter circuit, the second end of the third resistor is connected with the first end of the second capacitor, and the cathode of the controllable voltage-stabilizing source, the second end of the first capacitor and the second end of the second capacitor are connected in parallel to form the output end of the voltage comparison module.
In one embodiment, the optocoupler feedback module comprises a fourth resistor, a fifth resistor and an optocoupler;
the first end of the fourth resistor, the first end of the fifth resistor and the power output end of the rectifying circuit are interconnected, the second end of the fourth resistor, the cathode of the optocoupler and the output end of the voltage comparison module are connected, the anode of the optocoupler is connected with the second end of the fifth resistor, and the collector and the emitter of the optocoupler are respectively connected with the signal end of the voltage regulating circuit.
In one embodiment, the voltage regulating circuit comprises a switch chip, a sixth resistor, a third capacitor, a fourth capacitor, a fifth capacitor and a first diode;
the first end of the sixth resistor, the first end of the third capacitor, the first end of the fourth capacitor and the first end of the primary coil of the high-frequency transformer are interconnected, the second end of the primary coil of the high-frequency transformer, the anode of the first diode and the drain of the switch chip are interconnected, the second end of the sixth resistor, the second end of the third capacitor and the cathode of the first diode are interconnected, the second end of the fourth capacitor is grounded, the first end of the fifth capacitor, the source of the switch chip, the cathode of the output end of the input rectification filter circuit and the first signal output end of the voltage feedback module are connected, the second end of the fifth capacitor is connected with the synchronous end of the switch chip, and the feedback end of the switch chip is connected with the second signal output end of the voltage feedback module.
In one embodiment, the output rectifying circuit comprises a second diode, a seventh resistor and a sixth capacitor;
an anode of the second diode, a first end of the seventh resistor and a first end of a second secondary coil of the high-frequency transformer are connected, a second end of the seventh resistor is connected with a first end of the sixth capacitor, and a cathode of the second diode, a second end of the sixth capacitor, an anode of the input end of the output filter circuit and a signal input end of the voltage feedback circuit are interconnected.
In one embodiment, the output filter circuit comprises a seventh capacitor, an eighth capacitor, a ninth capacitor, a first inductor, a second inductor and a third inductor;
the first end of the seventh capacitor is connected with the first end of the first inductor to form the positive input end of the output filter circuit, the second end of the first inductor, the first end of the eighth capacitor and the first end of the second inductor are interconnected, the second end of the seventh capacitor, the second end of the eighth capacitor, the first end of the ninth capacitor and the first end of the third inductor are interconnected to form the negative input end of the output filter circuit, the second end of the second inductor is the positive output end of the output filter circuit, the second end of the ninth capacitor is grounded, and the second end of the third inductor is the negative output end of the output filter circuit.
In one embodiment, the input rectifying and filtering circuit comprises a three-phase rectifying bridge, a choke coil, a tenth capacitor and an eleventh capacitor;
the input end of the three-phase rectifier bridge is the power input end of the input rectification filter circuit, the output end of the three-phase rectifier bridge is connected with the input end of the choke coil, two ends of the eleventh capacitor are connected between the output ends of the three-phase rectifier bridge in parallel, and two ends of the tenth capacitor are connected between the output end of the choke coil in parallel and form the power output end of the input rectification filter circuit.
A second aspect of the embodiments of the present invention provides an electricity meter, which includes the power supply circuit of the electricity meter as described above.
The utility model discloses an input rectification filter circuit, voltage regulating circuit, high frequency transformer, output rectifier circuit, output filter circuit and voltage feedback circuit constitute ammeter power supply circuit, input rectification filter circuit carries out rectification filtering conversion to alternating current power supply, obtain high voltage direct current power supply and export to the series circuit, voltage feedback circuit samples the output voltage of output rectifier circuit and exports voltage feedback signal to voltage regulating circuit, voltage regulating circuit exports to high frequency transformer after carrying out voltage regulation to high voltage direct current power supply according to voltage regulating signal, high frequency transformer exports first high frequency low voltage pulse signal through first secondary coil after carrying out step-down conversion to high voltage direct current power supply after voltage regulation, and exports second high frequency voltage pulse signal through second secondary coil, output rectifier circuit exports to output filter circuit after rectifying second high frequency low voltage pulse signal, the output filter circuit filters the rectified second high-frequency low-voltage pulse signal to obtain low-voltage direct current and outputs the low-voltage direct current, the voltage regulating circuit regulates the size of the high-frequency voltage pulse signal output by the transformer according to the size of the voltage output by the output rectifying circuit, the conversion power is high, and the output voltage is guaranteed to be stable when the input voltage changes, so that the voltage stabilizing range is enlarged.
Drawings
Fig. 1 is a schematic diagram of a module structure of a first embodiment provided by an electric meter power circuit of the present invention;
fig. 2 is a schematic diagram of a module structure of a second embodiment provided by the utility model of an electricity meter power circuit;
fig. 3 is a schematic diagram of a circuit structure of the first embodiment provided by the power supply circuit of the utility model.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
The utility model provides an in the first aspect, an ammeter power supply circuit is provided.
As shown in fig. 1, fig. 1 is a schematic diagram of a module structure of a first embodiment provided by the utility model, in this embodiment, the utility model includes an input rectifying and filtering circuit 10, a voltage regulating circuit 20, a high-frequency transformer 30, an output rectifying and filtering circuit 40, an output filtering circuit 50 and a voltage feedback circuit 60;
the power input end of the input rectifying and filtering circuit 10 inputs an alternating current power supply, the power output end of the input rectifying and filtering circuit 10, the primary coil of the high-frequency transformer 30 and the voltage regulating circuit 20 are sequentially connected in series to form a series loop, the secondary coil of the high-frequency ratio transformer is connected with the input end of the output rectifying circuit 40, the output end of the output rectifying circuit 40, the power input end of the output filtering circuit 50 and the signal input end of the voltage feedback circuit 60 are interconnected, and the signal output end of the voltage feedback circuit 60 is connected with the signal end of the voltage regulating circuit 20;
the input rectification filter circuit 10 is used for carrying out rectification filter conversion on an alternating current power supply to obtain a high-voltage direct current power supply and outputting the high-voltage direct current power supply to a series circuit;
a voltage feedback circuit 60 for sampling an output voltage of the output rectifying circuit 40 and outputting a voltage feedback signal to the voltage regulating circuit 20;
the voltage regulating circuit 20 is used for regulating the voltage of the high-voltage direct-current power supply according to the voltage regulating signal and outputting the regulated voltage to the high-frequency transformer 30;
the high-frequency transformer 30 is used for performing voltage reduction conversion on the voltage-regulated high-voltage direct-current power supply, outputting a first high-frequency low-voltage pulse signal through a first secondary coil, and outputting a second high-frequency voltage pulse signal through a second secondary coil;
the output rectifying circuit 40 is used for rectifying the second high-frequency low-voltage pulse signal and outputting the rectified second high-frequency low-voltage pulse signal to the output filter circuit 50;
and the output filter circuit 50 is used for filtering the rectified second high-frequency low-voltage pulse signal to obtain low-voltage direct current and outputting the low-voltage direct current.
In this embodiment, the power supply circuit of the electric meter is suitable for a VT electric meter, and is configured to provide a working power supply to each functional module in the VT electric meter, such as various communication modules and control modules, wherein the conventional voltage input value of the VT electric meter is 3 × 57.7V/100V, so that the range of the required voltage of the power supply circuit of the electric meter is AC 50V-132V, the frequency is 50Hz, and two power supplies are output according to the use requirement, so as to meet the requirements of different modules.
The input rectifying and filtering circuit 10 rectifies and filters an input alternating current power supply, the input rectifying and filtering circuit 10 may include a three-phase rectifier bridge, a filter capacitor, and the like, and outputs a high-voltage direct current power supply to the high-frequency transformer 30 and the voltage regulating circuit 20, the voltage regulating circuit 20 and the high-frequency transformer 30 convert the high-voltage direct current power supply into a high-frequency low-voltage pulse signal to the output rectifying circuit 40, the voltage regulating circuit 20 may adopt a switching power supply circuit, a buck-boost circuit or other power supply converting circuits, the high-frequency low-voltage pulse signal is rectified and filtered again through the output rectifying circuit 40 and the output filtering circuit 50, and finally, the low-voltage direct current is output to.
The voltage feedback circuit 60 samples the output voltage of the output rectifying circuit 40 and feeds the sampled output voltage back to the voltage regulating circuit 20, wherein the voltage regulating circuit 20 performs negative feedback regulation according to the output voltage of the output rectifying circuit 40, for example, when the input voltage of the power supply circuit of the electricity meter is small, the direct current output by the output rectifying circuit 40 is small and smaller than the preset voltage, the voltage feedback circuit 60 outputs a voltage feedback signal to the voltage regulating circuit 20, the voltage regulating circuit 20 performs voltage rising regulation so that the second high-frequency low-voltage pulse signal output by the high-frequency transformer 30 is increased, otherwise, when the input voltage of the power supply circuit of the electricity meter is large, the direct current output by the output rectifying circuit 40 is large and larger than the preset voltage, the voltage feedback circuit 60 outputs a voltage feedback signal to the voltage regulating circuit 20, and the voltage regulating circuit 20 performs voltage falling, so that the second high-frequency low-voltage pulse signal output by the high-frequency transformer 30 becomes small, and when the voltage sampling signal is too large, the output of the high-frequency transformer 30 is switched, and further the output voltage of the power supply circuit of the electric meter is ensured to be kept stable, thereby improving the voltage stabilizing range.
The voltage feedback circuit 60 samples and feeds back the output voltage of the output rectifying circuit 40, and may include voltage sampling, voltage comparison and signal feedback functions, and therefore, the voltage feedback circuit 60 may include a voltage sampling module 61, a voltage comparison module 62 and an optical coupling feedback module 63, and the specific structure is selectively designed according to the requirement, which is not limited herein.
The high frequency transformer 30 includes a first secondary coil and a second secondary coil, and outputs a first high frequency low voltage pulse signal through the first secondary coil, the first high frequency low voltage pulse signal is one of the output power sources of the power circuit of the electricity meter, and outputs a second high frequency low voltage pulse signal through the second secondary coil, the second high frequency low voltage pulse signal is rectified and filtered through the output rectifying circuit 40 and the output filtering circuit 50, and outputs a low voltage direct current, and the low voltage direct current is the other output power source of the power circuit of the electricity meter.
The utility model discloses an input rectification filter circuit 10, voltage regulation circuit 20, high frequency transformer 30, output rectifier circuit 40, output filter circuit 50 and voltage feedback circuit 60 constitute ammeter power supply circuit, input rectification filter circuit 10 carries out rectification filtering conversion to alternating current power supply, obtain high voltage direct current power supply and export to the series circuit, voltage feedback circuit 60 samples the output voltage of output rectifier circuit 40 and exports voltage feedback signal to voltage regulation circuit 20, voltage regulation circuit 20 exports to high frequency transformer 30 after carrying out voltage regulation to high voltage direct current power supply according to voltage regulation signal, high frequency transformer 30 carries out step-down conversion to high voltage direct current power supply after voltage regulation, export first high frequency low voltage pulse signal through first secondary coil, and export second high frequency voltage pulse signal through second secondary coil, output rectifier circuit 40 exports to output filter circuit 50 after rectifying second high frequency low voltage pulse signal, the output filter circuit 50 filters the rectified second high-frequency low-voltage pulse signal to obtain low-voltage direct current and outputs the low-voltage direct current, the voltage regulating circuit 20 regulates the high-frequency voltage pulse signal output by the transformer according to the voltage output by the output rectifying circuit 40, the conversion power is high, and the output voltage is ensured to be stable when the input voltage changes, so that the voltage stabilizing range is enlarged.
As shown in fig. 2, in one embodiment, the voltage feedback circuit 60 includes a voltage sampling module 61, a voltage comparison module 62, and an opto-coupler feedback module 63;
the input end of the voltage sampling module 61 is the signal input end of the voltage feedback circuit 60, the output end of the voltage sampling module 61 is connected with the input end of the voltage comparison module 62, the output end of the voltage comparison module 62 is connected with the input end of the optocoupler feedback module 63, and the output end of the optocoupler feedback module 63 is the signal output end of the voltage feedback circuit 60;
the voltage sampling module 61 is used for sampling the output voltage of the output rectifying circuit 40 and feeding back a voltage sampling signal to the voltage comparison module 62;
a voltage comparison module 62, configured to compare the voltage sampling signal with a reference voltage, and output a turn-on signal when the voltage of the voltage sampling signal is less than the reference voltage, and output a turn-off signal when the voltage of the voltage sampling signal is greater than the reference voltage;
and the optocoupler feedback module 63 is configured to feedback the on signal and the off signal to the voltage regulating circuit 20, so that the voltage regulating circuit 20 performs power conversion operation or stops the power conversion operation according to the on signal and the off signal.
In this embodiment, the voltage comparison module 62 compares the voltage sampling signal with a reference voltage, wherein the reference voltage can be an output threshold voltage, and when the voltage sampling signal is less than the output threshold voltage, the voltage comparison module 62 outputs a conducting signal, and the conducting signal is isolated and output to the voltage regulation circuit 20 through the optical coupling feedback module 63, the voltage regulation circuit 20 is correspondingly conducted, and provides a passage for the primary coil of the high-frequency transformer 30, to supply power to the secondary coil of the high frequency transformer 30, the voltage adjusting circuit 20 performs negative feedback voltage adjustment operation according to the turn-on signal, when the voltage sampling signal exceeds the reference voltage, the voltage comparison module 62 outputs a turn-off signal and feeds back the turn-off signal to the voltage regulation circuit 20 through the optical coupling feedback module 63 to turn off the voltage regulation circuit 20, and further controls the high-frequency transformer 30 to stop outputting, thereby ensuring the output of the power supply circuit of the electric meter to be stable.
The voltage sampling module 61 may adopt a transformer, a resistor divider circuit, or other circuits, and the specific structure is not limited, as shown in fig. 3, in an embodiment, the voltage sampling module 61 includes a first resistor R1 and a second resistor R2;
the first end of the first resistor R1 is an input end of the voltage sampling module 61, the second end of the first resistor R1 and the first end of the second resistor R2 are connected to form an output end of the voltage sampling module 61, the second end of the second resistor R2 is connected to a negative electrode of an input end of the output filter circuit 50, and the output voltage of the output rectifying circuit 40 is divided by the first resistor R1 and the second resistor R2 and is output to the voltage comparison module 62.
The voltage comparison module 62 may adopt a comparator, a regulator or other comparison modules, and the specific structure is not limited, the optocoupler feedback module 63 may adopt an optocoupler U2 and other components, as shown in fig. 3, in an embodiment, the voltage comparison module 62 includes a controllable regulator U1, a third resistor R3, a first capacitor C1 and a second capacitor C2;
a reference end of a controllable voltage-stabilizing source U1, a first end of a third resistor R3 and a first end of a first capacitor C1 are interconnected to form an input end of the voltage comparison module 62, an anode of the controllable voltage-stabilizing source U1 is connected with a negative electrode of an input end of the output filter circuit 50, a second end of the third resistor R3 is connected with a first end of a second capacitor C2, a cathode of the controllable voltage-stabilizing source U1, a second end of the first capacitor C1 and a second end of the second capacitor C2 are connected in parallel to form an output end of the voltage comparison module 62, and the optical coupling feedback module 63 comprises a fourth resistor R4, a fifth resistor R5 and an optical coupling U2;
the first end of the fourth resistor R4 and the first end of the fifth resistor R5 are interconnected with the power output end of the rectifying circuit, the second end of the fourth resistor R4, the cathode of the optocoupler U2 and the output end of the voltage comparison module 62 are connected, the anode of the optocoupler U2 is connected with the second end of the fifth resistor R5, and the collector and the emitter of the optocoupler U2 are respectively connected with the signal end of the voltage regulating circuit 20.
The voltage comparison module 62 and the optical coupling feedback module 63 form a voltage feedback loop, which generates an enable signal by comparing the output voltage of the output rectifying circuit 40 with a reference voltage to detect and feedback the output voltage of the output rectifying circuit 40, wherein, the controllable voltage-stabilizing source U1 provides a reference voltage, when the voltage sampling signal is less than the reference voltage, the controllable voltage-stabilizing source U1 is turned off, the optical coupler U2 is turned off, and a first level signal is output to the voltage regulating circuit 20, the voltage regulating circuit 20 performs voltage regulation work, when the voltage sampling signal is greater than the reference voltage, the controllable voltage-stabilizing source U1 is conducted, the optical coupler U2 is conducted, thereby outputting a second level signal to the voltage regulating circuit 20, turning off the voltage regulating circuit 20, and switching the outputs of the output rectifying circuit 40 and the output filtering circuit 50, wherein in one embodiment, the controllable voltage regulator U1 is of type TL 431.
In one embodiment, the voltage regulating circuit 20 includes a switch chip U3, a sixth resistor R6, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a first diode D1;
the first end of the sixth resistor R6, the first end of the third capacitor C3, the first end of the fourth capacitor C4 and the first end of the primary coil of the high-frequency transformer 30 are interconnected, the second end of the primary coil of the high-frequency transformer 30, the anode of the first diode D1 and the drain of the switch chip U3 are interconnected, the second end of the sixth resistor R6, the second end of the third capacitor C3 and the cathode of the first diode D1 are interconnected, the second end of the fourth capacitor C4 is grounded, the first end of the fifth capacitor C5, the source of the switch chip U3, the cathode of the output end of the input rectifying and filtering circuit 10 and the first signal output end of the voltage feedback module are connected, the second end of the fifth capacitor C5 is connected with the synchronous end of the switch chip U3, and the feedback end of the switch chip U3 is connected with the second signal output end of the voltage feedback module.
In the embodiment, when a voltage sampling signal is smaller than a reference voltage, a controllable voltage-stabilizing source U1 is turned off, an optical coupler U2 is turned off, a first level signal is sent to a feedback end of a switch chip U3, a high level is input to the feedback end of the switch chip U3, a voltage regulating circuit 20 performs voltage regulating work, when the voltage sampling signal is larger than the reference voltage, the controllable voltage-stabilizing source U1 is turned on, an optical coupler U2 is turned on, so that a second level signal is output to a feedback end of a switch chip U3, the feedback end of the switch chip U3 is horizontally arranged low, the output of an output rectifying circuit 40 and an output filtering circuit 50 are switched, in one embodiment, the switch chip U3 is a TNY290 chip, the TNY290 chip integrates a 725V power MOSFET, an oscillator, a high-voltage switch current source, a current limiting and thermal turn-off circuit, is suitable for being applied to a medium-low-power use environment of an electric meter, fewer peripheral devices, lower system cost and a larger output, the switch chip U3 outputs a corresponding PWM signal to the switch tube inside the switch chip U3 according to the level signal received by the feedback terminal to perform on/off control of the switch tube, thereby changing the voltage levels of the primary coil and the secondary coil of the high frequency transformer 30.
In one embodiment, the output rectification circuit 40 includes a second diode D2, a seventh resistor R7, and a sixth capacitor C6;
an anode of the second diode D2, a first end of the seventh resistor R7, and a first end of the second secondary winding of the high-frequency transformer 30 are connected, a second end of the seventh resistor R7 is connected to a first end of the sixth capacitor C6, and a cathode of the second diode D2, a second end of the sixth capacitor C6, an anode of the input terminal of the output filter circuit 50, and the signal input terminal of the voltage feedback circuit 60 are interconnected.
In this embodiment, the output rectifying circuit 40 performs half-wave rectification by using the second diode D2, and the seventh resistor R7 and the sixth capacitor C6 form a current bleeding circuit.
In one embodiment, the output filter circuit 50 includes a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a first inductor L1, a second inductor L2, and a third inductor L3;
a first end of the seventh capacitor C7 is connected to a first end of the first inductor L1 to form an input terminal anode of the output filter circuit 50, a second end of the first inductor L1, a first end of the eighth capacitor C8 and a first end of the second inductor L2 are interconnected, a second end of the seventh capacitor C7, a second end of the eighth capacitor C8, a first end of the ninth capacitor C9 and a first end of the third inductor L3 are interconnected to form an input terminal cathode of the output filter circuit 50, a second end of the second inductor L2 is an output terminal anode of the output filter circuit 50, a second end of the ninth capacitor C9 is grounded, and a second end of the third inductor L3 is an output terminal cathode of the output filter circuit 50.
In this embodiment, each capacitor and each inductor form an LC filter circuit to filter the low-voltage dc output by the output rectifier circuit.
In one embodiment, the input rectifying and filtering circuit 10 includes a three-phase rectifying bridge, a choke coil L4, a tenth capacitor C10, and an eleventh capacitor C11;
the input end of the three-phase rectifier bridge is the power input end of the input rectifier filter circuit 10, the output end of the three-phase rectifier bridge is connected with the input end of the choke coil L4, two ends of the eleventh capacitor C11 are connected between the output ends of the three-phase rectifier bridge in parallel, and two ends of the tenth capacitor C10 are connected with the output end of the choke coil L4 in parallel and form the power output end of the input rectifier filter circuit 10.
In this embodiment, the three-phase rectifier bridge rectifies the input three-phase ac power and converts the rectified ac power into high-voltage dc power through the choke coil L4 and the capacitor.
The utility model discloses still provide an ammeter, this ammeter include ammeter power supply circuit, and this ammeter power supply circuit's concrete structure refers to above-mentioned embodiment, because this ammeter has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. An ammeter power supply circuit is characterized by comprising an input rectifying and filtering circuit, a voltage regulating circuit, a high-frequency transformer, an output rectifying circuit, an output filtering circuit and a voltage feedback circuit;
the power input end of the input rectifying and filtering circuit inputs an alternating current power supply, the power output end of the input rectifying and filtering circuit, the primary coil of the high-frequency transformer and the voltage regulating circuit are sequentially connected in series to form a series loop, the secondary coil of the high-frequency ratio transformer is connected with the input end of the output rectifying circuit, the output end of the output rectifying circuit, the power input end of the output filtering circuit and the signal input end of the voltage feedback circuit are interconnected, and the signal output end of the voltage feedback circuit is connected with the signal end of the voltage regulating circuit;
the input rectification filter circuit is used for carrying out rectification filtering conversion on the alternating current power supply to obtain a high-voltage direct current power supply and outputting the high-voltage direct current power supply to the series loop;
the voltage feedback circuit is used for sampling the output voltage of the output rectifying circuit and outputting a voltage feedback signal to the voltage regulating circuit;
the voltage regulating circuit is used for regulating the voltage of the high-voltage direct-current power supply according to the voltage regulating signal and outputting the regulated voltage to the high-frequency transformer;
the high-frequency transformer is used for outputting a first high-frequency low-voltage pulse signal through a first secondary coil and outputting a second high-frequency voltage pulse signal through a second secondary coil after voltage reduction conversion is carried out on the high-voltage direct-current power supply after voltage regulation;
the output rectifying circuit is used for rectifying the second high-frequency low-voltage pulse signal and outputting the second high-frequency low-voltage pulse signal to the output filter circuit;
and the output filter circuit is used for filtering the rectified second high-frequency low-voltage pulse signal to obtain low-voltage direct current and outputting the low-voltage direct current.
2. An electricity meter power circuit as in claim 1, wherein said voltage feedback circuit comprises a voltage sampling module, a voltage comparison module and an opto-coupler feedback module;
the input end of the voltage sampling module is the signal input end of the voltage feedback circuit, the output end of the voltage sampling module is connected with the input end of the voltage comparison module, the output end of the voltage comparison module is connected with the input end of the optocoupler feedback module, and the output end of the optocoupler feedback module is the signal output end of the voltage feedback circuit;
the voltage sampling module is used for sampling the output voltage of the output rectifying circuit and feeding back a voltage sampling signal to the voltage comparison module;
the voltage comparison module is used for comparing the voltage sampling signal with a reference voltage, outputting a turn-on signal when the voltage of the voltage sampling signal is smaller than the reference voltage, and outputting a turn-off signal when the voltage of the voltage sampling signal is larger than the reference voltage;
the optical coupling feedback module is used for outputting the on signal and the off signal to the voltage regulating circuit in a feedback mode, so that the voltage regulating circuit can respectively carry out power supply conversion work or stop the power supply conversion work according to the on signal and the off signal.
3. An electricity meter power circuit as in claim 2, wherein said voltage sampling module comprises a first resistor and a second resistor;
the first end of the first resistor is the input end of the voltage sampling module, the second end of the first resistor is connected with the first end of the second resistor to form the output end of the voltage sampling module, and the second end of the second resistor is connected with the negative electrode of the input end of the output filter circuit.
4. An electricity meter power circuit as in claim 3, wherein said voltage comparison module comprises a controllable regulated voltage source, a third resistor, a first capacitor and a second capacitor;
the reference end of the controllable voltage-stabilizing source, the first end of the third resistor and the first end of the first capacitor are interconnected to form the input end of the voltage comparison module, the anode of the controllable voltage-stabilizing source is connected with the negative electrode of the input end of the output filter circuit, the second end of the third resistor is connected with the first end of the second capacitor, and the cathode of the controllable voltage-stabilizing source, the second end of the first capacitor and the second end of the second capacitor are connected in parallel to form the output end of the voltage comparison module.
5. An electricity meter power circuit as in claim 4, wherein said opto-coupler feedback module comprises a fourth resistor, a fifth resistor and an opto-coupler;
the first end of the fourth resistor, the first end of the fifth resistor and the power output end of the rectifying circuit are interconnected, the second end of the fourth resistor, the cathode of the optocoupler and the output end of the voltage comparison module are connected, the anode of the optocoupler is connected with the second end of the fifth resistor, and the collector and the emitter of the optocoupler are respectively connected with the signal end of the voltage regulating circuit.
6. The power supply circuit of an electricity meter according to claim 1, wherein the voltage regulating circuit includes a switching chip, a sixth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, and a first diode;
the first end of the sixth resistor, the first end of the third capacitor, the first end of the fourth capacitor and the first end of the primary coil of the high-frequency transformer are interconnected, the second end of the primary coil of the high-frequency transformer, the anode of the first diode and the drain of the switch chip are interconnected, the second end of the sixth resistor, the second end of the third capacitor and the cathode of the first diode are interconnected, the second end of the fourth capacitor is grounded, the first end of the fifth capacitor, the source of the switch chip, the cathode of the output end of the input rectification filter circuit and the first signal output end of the voltage feedback module are connected, the second end of the fifth capacitor is connected with the synchronous end of the switch chip, and the feedback end of the switch chip is connected with the second signal output end of the voltage feedback module.
7. An electricity meter power circuit as in claim 1, wherein said output rectifying circuit includes a second diode, a seventh resistor and a sixth capacitor;
an anode of the second diode, a first end of the seventh resistor and a first end of a second secondary coil of the high-frequency transformer are connected, a second end of the seventh resistor is connected with a first end of the sixth capacitor, and a cathode of the second diode, a second end of the sixth capacitor, an anode of the input end of the output filter circuit and a signal input end of the voltage feedback circuit are interconnected.
8. An electricity meter power circuit as in claim 1, wherein said output filter circuit comprises a seventh capacitor, an eighth capacitor, a ninth capacitor, a first inductor, a second inductor and a third inductor;
the first end of the seventh capacitor is connected with the first end of the first inductor to form the positive input end of the output filter circuit, the second end of the first inductor, the first end of the eighth capacitor and the first end of the second inductor are interconnected, the second end of the seventh capacitor, the second end of the eighth capacitor, the first end of the ninth capacitor and the first end of the third inductor are interconnected to form the negative input end of the output filter circuit, the second end of the second inductor is the positive output end of the output filter circuit, the second end of the ninth capacitor is grounded, and the second end of the third inductor is the negative output end of the output filter circuit.
9. An electricity meter power circuit as in claim 1, wherein said input rectifying filter circuit comprises a three-phase rectifying bridge, a choke coil, a tenth capacitor and an eleventh capacitor;
the input end of the three-phase rectifier bridge is the power input end of the input rectification filter circuit, the output end of the three-phase rectifier bridge is connected with the input end of the choke coil, two ends of the eleventh capacitor are connected between the output ends of the three-phase rectifier bridge in parallel, and two ends of the tenth capacitor are connected between the output end of the choke coil in parallel and form the power output end of the input rectification filter circuit.
10. An electricity meter comprising an electricity meter power circuit according to any one of claims 1 to 9.
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| CN202020430061.2U CN212210864U (en) | 2020-03-27 | 2020-03-27 | Ammeter power supply circuit and ammeter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111313723A (en) * | 2020-03-27 | 2020-06-19 | 深圳龙电电气股份有限公司 | Ammeter power supply circuit and ammeter |
| CN114582070A (en) * | 2022-02-28 | 2022-06-03 | 无锡市恒通电器有限公司 | Single-phase guide rail type intelligent electric energy meter supporting quota management |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111313723A (en) * | 2020-03-27 | 2020-06-19 | 深圳龙电电气股份有限公司 | Ammeter power supply circuit and ammeter |
| CN114582070A (en) * | 2022-02-28 | 2022-06-03 | 无锡市恒通电器有限公司 | Single-phase guide rail type intelligent electric energy meter supporting quota management |
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