CN216350926U - Low-cost, high accuracy dc-to-ac converter power sampling circuit - Google Patents
Low-cost, high accuracy dc-to-ac converter power sampling circuit Download PDFInfo
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- CN216350926U CN216350926U CN202122399877.0U CN202122399877U CN216350926U CN 216350926 U CN216350926 U CN 216350926U CN 202122399877 U CN202122399877 U CN 202122399877U CN 216350926 U CN216350926 U CN 216350926U
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Abstract
The utility model discloses a low-cost and high-precision inverter power sampling circuit which comprises a proportional amplification module, a processor module, a bridge stack module, a positive end, a negative end and a bus end, wherein the positive end, the negative end and the bus end are arranged on an inversion output part of the bridge stack module, a first capacitor is respectively connected in parallel between the positive end and the bus end of the inversion output part of the bridge stack module, and a first voltage sampling resistor and a second voltage sampling resistor are connected in parallel between the positive end and the bus end. Compared with the existing inverter power sampling circuit which needs to be connected with a large-volume current transformer in series, the low-cost and high-precision inverter power sampling circuit disclosed by the utility model is small in volume, and is beneficial to the miniaturization development of the whole inverter product. In addition, the sampling circuit is only composed of a plurality of sampling resistors, a proportional amplification module and the like, and the cost of the whole sampling circuit is lower. The sampling circuit can be formed by machine coating resistors, and the whole cost is lower.
Description
Technical Field
The utility model relates to the field of power supply components, in particular to a low-cost and high-precision inverter power sampling circuit.
Background
The inverter is a converter which converts direct current electric energy (batteries and storage batteries) into constant-frequency constant-voltage or frequency-modulation voltage-regulation alternating current (generally 220V,50Hz sine wave). The existing inverter power sampling is realized by taking voltage and current output by alternating current, but the output current has large impact current when the inverter is started, a resistor is directly connected in series and is easily damaged, and a current transformer is generally added at an output end to couple the current to be sent to a current sampling port of a single chip microcomputer. However, the inverter with the current transformer has high cost and large volume, and the current transformer elements need to be manually assembled into the finished inverter. In view of the above technical drawbacks, it is necessary to provide a new inverter power sampling circuit.
Disclosure of Invention
The utility model aims to provide a low-cost and high-precision inverter power sampling circuit which is applied to a circuit of an inverter, effectively reduces the overall manufacturing cost of the inverter and is beneficial to the miniaturization development of the inverter.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
the utility model provides a low-cost, high accuracy dc-to-ac converter power sampling circuit, includes proportion amplification module, processor module, bridge rectifier module, sets up positive terminal, negative pole end and the bus-bar terminal at the contravariant output part of bridge rectifier module, its characterized in that: a first capacitor is respectively connected in parallel between the positive electrode end and the bus end of the inversion output part of the bridge stack module, a first voltage sampling resistor and a second voltage sampling resistor are connected in parallel between the positive electrode end and the bus bar end, a current sampling resistor is connected in parallel between the negative electrode end and the bus end, a sampling voltage signal is arranged between the first voltage sampling resistor and the second voltage sampling resistor, the sampling voltage signal is connected with the voltage signal input end of the processor module, the bus output end of the current sampling resistor is connected with the positive end of the proportional amplification module, the negative end of the current sampling resistor is connected, the output end of the proportional amplification module outputs a sampling current signal which is connected with the current signal input end of the processor module, the output end of the processor module outputs sampling power signals of the sampling voltage signals and the sampling current signals.
And the output end of the processor module is connected with the input end of the display module.
Furthermore, the proportional amplification module comprises an inverting amplifier, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor, wherein the inverting terminal of the inverting amplifier is connected with the negative terminal of the current sampling resistor through the fourth resistor, the forward terminal of the inverting amplifier is connected with the bus output terminal of the current sampling resistor through the fifth resistor, the output terminal of the inverting amplifier is connected with the inverting terminal of the inverting amplifier through the sixth resistor, and the grounding terminal of the inverting amplifier is connected with the forward terminal of the inverting amplifier through the seventh resistor.
The direct current power supply module is connected with the positive electrode of the inverting amplifier, the positive electrode of the processor module and the positive electrode of the display module respectively, and the grounding end of the inverting amplifier, the grounding end of the processor module and the grounding end of the display module are connected with the bus end respectively.
Further, the bridge rectifier module comprises a bridge rectifier chip, and the model of the bridge rectifier chip is BD 401.
By adopting the technical scheme, compared with the existing inverter power sampling circuit, the sampling circuit needs to be connected with a large-volume current transformer in series, and the sampling circuit is small in volume and beneficial to the miniaturization development of the whole inverter product. In addition, the sampling circuit is only composed of a plurality of sampling resistors, a proportional amplification module and the like, and the cost of the whole sampling circuit is lower. The sampling circuit can be formed by machine coating resistors, and the whole cost is lower.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, the utility model discloses a low-cost and high-precision inverter power sampling circuit, which comprises a proportional amplification module 1, a processor module MCU, a bridge module 3, and a positive terminal 31, a negative terminal 32 and a bus terminal 33 which are arranged at an inversion output part of the bridge module 3, wherein a first capacitor EC1 is respectively connected in parallel between the positive terminal 31 and the bus terminal 33 of the inversion output part of the bridge module 3, two ends of the first capacitor EC1 are also connected in parallel with a load, a first voltage sampling resistor R1 and a second voltage sampling resistor R2 are connected in parallel between the positive terminal 31 and the bus terminal 33, and a current sampling resistor R3 is connected in parallel between the negative terminal 32 and the bus terminal 33.
A sampling voltage signal is arranged between the first voltage sampling resistor R1 and the second voltage sampling resistor R2, and the sampling voltage signal is connected with a voltage signal input end of the processor module MCU.
The bus output end of the current sampling resistor R3 is connected with the positive terminal 31 of the proportional amplification module 1, the negative terminal 32 of the current sampling resistor R3 is connected, and the output end of the proportional amplification module 1 outputs a sampling current signal which is connected with the current signal input end of the MCU of the processor module.
The output end of the processor module MCU outputs sampling power signals of the sampling voltage signals and the sampling current signals.
The current output by the inversion output part of the bridge stack module is mapped in proportion to the current flowing between the first capacitors, and the current output by the inversion output part of the bridge stack module can be obtained by sampling the current between the negative electrode end of the bridge stack module and the negative electrode of the first capacitor on the bus end and multiplying a proportionality coefficient. The sampling positions of the specific currents are as follows: and a current sampling resistor is connected in parallel between the negative end and the bus end, and a tiny voltage is formed at two ends of the current sampling resistor and is sent to the current signal input end of the processor module after being amplified by the proportion amplification module.
The voltage output by the inversion output part of the bridge stack module corresponds to the voltage of the inversion output part and the voltage at two ends of the first capacitor at the bus end, and the output alternating voltage of the inversion output part can be obtained by sampling the voltage at two ends of the large capacitor and multiplying the voltage by a proportionality coefficient. The specific voltage sampling locations are as follows: a first voltage sampling resistor and a second voltage sampling resistor are connected in parallel between the positive end of the inversion output part and the bus end, a sampling voltage signal is arranged between the first voltage sampling resistor and the second voltage sampling resistor, and the sampling voltage signal is sent to a voltage signal input end of the processor module.
The processor module multiplies the current value of the current signal input end by the voltage value of the voltage signal input end, and then multiplies the corresponding current proportionality coefficient and the voltage proportionality coefficient, and the output end of the processor module outputs a sampling power signal to finish the whole power sampling process.
Compared with the existing inverter power sampling circuit, the sampling circuit needs to be connected with a large-volume current transformer in series, is small in volume and is beneficial to the miniaturization development of the whole inverter product. In addition, the sampling circuit is only composed of a plurality of sampling resistors, a proportional amplification module and the like, and the cost of the whole sampling circuit is lower. The sampling circuit can be formed by machine coating resistors, and the whole cost is lower.
Referring to fig. 1, the circuit module further includes a display module 2, and an output terminal of the processor module MCU is connected to an input terminal of the display module 2. And the power parameters output by the processor module are visually displayed through a display module.
Referring to the specific structure of the scaling module of fig. 1, the scaling module 1 includes an inverting amplifier 11, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7. The inverting terminal of the inverting amplifier 11 is connected to the negative terminal 32 of the current sampling resistor R3 through a fourth resistor R4. The positive terminal of the inverting amplifier 11 is connected to the bus output terminal of the current sampling resistor R3 through a fifth resistor R5. The output terminal of the inverting amplifier 11 is connected to the inverting terminal of the inverting amplifier 11 through a sixth resistor R6. The ground terminal of the inverting amplifier 11 is connected to the positive terminal of the inverting amplifier 11 through a seventh resistor R7.
Referring to fig. 1, the following sections require dc power supply: the direct current power supply device further comprises a direct current power supply module 4, and the positive electrode output end of the direct current power supply module 4 is respectively connected with the positive electrode of the inverting amplifier 11, the positive electrode of the processor module MCU and the positive electrode output end of the display module 2. The grounding terminal of the inverting amplifier 11, the grounding terminal of the processor module MCU, and the grounding terminal of the display module 2 are connected to the bus terminal 33, respectively.
The bridge-reactor module 3 comprises a bridge-reactor chip, the model of which is BD 401.
The bridge-stack modules are connected as follows, and include a first rectifier diode D1, a second rectifier diode D2, a third rectifier diode D3, and a fourth rectifier diode D4. The cathode of the first rectifying diode D1 is connected to the anode of the second rectifying diode D2; the cathode of the second rectifier diode D2 is connected to the cathode of the third rectifier diode D3; the cathode of the fourth rectifier diode D4 is connected to the cathode of the third rectifier diode D3; the anode of the first rectifying diode D1 is connected to the anode of the fourth rectifying diode D4; one end of the inversion input part of the bridge stack module is arranged between the first rectifier diode D1 and the second rectifier diode D2; the other end of the inversion input part of the bridge stack module is arranged between the third rectifier diode D3 and the fourth rectifier diode D4; a positive end of an inversion output part of the bridge stack module is arranged between the second rectifier diode D2 and the third rectifier diode D3; the negative end of the inverter output part of the bridge module is arranged between the fourth rectifier diode D4 and the first rectifier diode D1.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, and the scope of protection is still within the scope of the utility model.
Claims (5)
1. The utility model provides a low-cost, high accuracy inverter power sampling circuit, includes proportion amplification module (1), processor Module (MCU), bridge rectifier module (3), sets up positive terminal (31), negative pole end (32) and bus-bar terminal (33) at the contravariant output part of bridge rectifier module (3), its characterized in that: a first capacitor (EC 1) is respectively connected in parallel between a positive terminal (31) and a bus terminal (33) of an inversion output part of the bridge stack module (3), a first voltage sampling resistor (R1) and a second voltage sampling resistor (R2) are connected in parallel between the positive terminal (31) and the bus terminal (33), a current sampling resistor (R3) is connected in parallel between the negative terminal (32) and the bus terminal (33),
a sampling voltage signal is arranged between the first voltage sampling resistor (R1) and the second voltage sampling resistor (R2), the sampling voltage signal is connected with a voltage signal input end of the processor Module (MCU),
the bus output end of the current sampling resistor (R3) is connected with the positive end (31) of the proportional amplification module (1), the negative end (32) of the current sampling resistor (R3) is connected, the output end of the proportional amplification module (1) outputs a sampling current signal which is connected with the current signal input end of the processor Module (MCU),
and the output end of the processor Module (MCU) outputs the sampling voltage signal and the sampling power signal of the sampling current signal.
2. The low-cost, high-precision inverter power sampling circuit of claim 1, wherein: the display device is characterized by further comprising a display module (2), wherein the output end of the processor Module (MCU) is connected with the input end of the display module (2).
3. The low-cost, high-precision inverter power sampling circuit of claim 2, wherein: the proportional amplification module (1) comprises an inverting amplifier (11), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6) and a seventh resistor (R7),
the inverting terminal of the inverting amplifier (11) is connected with the negative terminal (32) of the current sampling resistor (R3) through a fourth resistor (R4),
the positive end of the inverting amplifier (11) is connected with the bus output end of the current sampling resistor (R3) through a fifth resistor (R5),
the output end of the inverting amplifier (11) is connected with the inverting end of the inverting amplifier (11) through a sixth resistor (R6),
the grounding end of the inverting amplifier (11) is connected with the positive end of the inverting amplifier (11) through a seventh resistor (R7).
4. The low-cost, high-precision inverter power sampling circuit of claim 3, wherein: the device also comprises a direct current power supply module (4), wherein the positive electrode output end of the direct current power supply module (4) is respectively connected with the positive electrode of the inverting amplifier (11), the positive electrode of the processor Module (MCU) and the positive electrode output end of the display module (2),
and the grounding end of the inverting amplifier (11), the grounding end of the processor Module (MCU) and the grounding end of the display module (2) are respectively connected with the bus end (33).
5. The low-cost, high-precision inverter power sampling circuit of claim 1, wherein: the bridge rectifier module (3) comprises a bridge rectifier chip, and the model of the bridge rectifier chip is BD 401.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122399877.0U CN216350926U (en) | 2021-09-30 | 2021-09-30 | Low-cost, high accuracy dc-to-ac converter power sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122399877.0U CN216350926U (en) | 2021-09-30 | 2021-09-30 | Low-cost, high accuracy dc-to-ac converter power sampling circuit |
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| Publication Number | Publication Date |
|---|---|
| CN216350926U true CN216350926U (en) | 2022-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122399877.0U Active CN216350926U (en) | 2021-09-30 | 2021-09-30 | Low-cost, high accuracy dc-to-ac converter power sampling circuit |
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| CN (1) | CN216350926U (en) |
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2021
- 2021-09-30 CN CN202122399877.0U patent/CN216350926U/en active Active
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