Charging circuit

Abstract

The present invention addresses the problem of determining an AC waveform with a simple configuration. A charging circuit is provided with: a plurality of power lines through which at least an alternating current flows as an input current; and a first sensor and a second sensor for measuring the voltage of the input current as digital sensors. The plurality of power lines have: an ungrounded-side power line in which an input current flows to the first sensor; a ground-side power line through which the current that has passed through the first sensor flows to the ground side; a branch power line that branches from the ground-side power line and causes current to flow to the second sensor; and a combined power line that causes the current that has passed through the second sensor to flow to the ungrounded power line.

Description

Technical Field

[0001] This invention relates to a charging circuit. Background Technology

[0002] As described in Patent Document 1 below, it is known that a useful voltage sensor measures alternating current.

[0003] Patent Document 1: International Publication No. 2013 / 054435 Summary of the Invention

[0004] In Patent Document 1, when the power quality of an AC waveform, such as a pseudo-sine wave, is poor, a digital sensor that determines the presence or absence of voltage cannot be correctly identified as an AC waveform. On the other hand, if an analog sensor is used, there is the problem of expensive circuitry, and it is not possible to determine the AC waveform with a simple structure.

[0005] The purpose of this invention is to determine AC waveforms using a simple structure.

[0006] This invention provides a charging circuit comprising: a plurality of power lines through which at least alternating current flows as input current; and a first sensor and a second sensor, which are digital sensors for measuring the voltage of the input current. The plurality of power lines include: an ungrounded power line through which the input current flows to the first sensor; a grounded power line through which the current passing through the first sensor flows to the ground side; a branch power line that branches off from the grounded power line to allow current to flow to the second sensor; and a converging power line that allows the current passing through the second sensor to flow to the ungrounded power line.

[0007] Invention Effects

[0008] According to the present invention, AC waveforms can be determined with a simple structure. Attached Figure Description

[0009] Figure 1 This is a structural diagram showing the charging circuit involved in this embodiment.

[0010] Figure 2 This indicates input to Figure 1 The diagram shows an example of the system voltage waveform of the charging circuit.

[0011] Figure 3 It means Figure 2 The system voltage input shown is... Figure 1 The diagram shows an example of sensor output in the case of the charging circuit shown.

[0012] Figure 4 This is a structural diagram of the charging circuit involved in the comparative example.

[0013] Figure 5This is a diagram showing the waveform example of the system voltage input to the comparison example and the sensor output example. Detailed Implementation

[0014] Hereinafter, this embodiment will be described with reference to the accompanying drawings. To facilitate understanding, the same components in each drawing will be labeled with the same symbols as much as possible, and repeated descriptions will be omitted.

[0015] like Figure 1 As shown, the charging circuit 2 according to this embodiment includes: an ungrounded power line 21; a grounded power line 22; a branch power line 23; a confluence power line 24; a first sensor S1; and a second sensor S2.

[0016] The first sensor S1 and the second sensor S2 are digital sensors capable of determining the presence or absence of voltage. The first sensor S1 is configured to be connected to the ungrounded power line 21. The ungrounded power line 21 is configured such that input current flows into the first sensor S1. More specifically, the input current is configured to flow from the collector side of the transistor in the first sensor S1 towards the emitter side and is input to the base side. A diode D1 is disposed on the ungrounded power line 21 upstream of the first sensor S1.

[0017] The first sensor S1 is also connected to the grounding power line 22. The grounding power line 22 is configured such that the current passing through the first sensor S1 flows to the grounding side.

[0018] Branch power line 23 is configured to branch from grounded power line 22, allowing current to flow to the second sensor S2. More specifically, the input current is configured to flow from the emitter side of the transistor in the second sensor S2 towards the collector side and be input to the base side. A diode D2 is disposed on the branch power line 23 upstream of the second sensor S2. The confluence power line 24 is configured to allow current passing through the second sensor S2 to flow to the ungrounded power line 21.

[0019] By setting the charging circuit 2 to the structure described above, the first sensor S1 functions as a digital voltage sensor capable of determining only the presence or absence of voltage on the positive side, and the second sensor S2 functions as a digital voltage sensor capable of determining only the presence or absence of voltage on the negative side.

[0020] In such Figure 2 When a pseudo-sine wave system voltage is input as shown, the sensor output becomes as follows: Figure 3 As shown. Figure 3 (A) illustrates the sensor output of the first sensor S1. Figure 3 (B) illustrates the sensor output of the second sensor S2.

[0021] To clarify the technical features of the charging circuit 2 involved in this embodiment, refer to Figure 4 The charging circuit 2A, which serves as a comparative example, will be explained. For example... Figure 4 As shown, the charging circuit 2A includes an ungrounded power line 21A, a grounded power line 22A, a bridge circuit BS, and a digital sensor SA. The bridge circuit BS is a rectifier circuit composed of four diodes D1, D2, D3, and D4.

[0022] In a digital sensor (SA), the sensor output receives a positive DC voltage only when the input voltage exceeds a threshold; when the input voltage is below the threshold, the sensor output becomes 0. Furthermore, the sensor output is always positive regardless of the sign of the input AC waveform.

[0023] In the input Figure 5 In the case of a normal sine wave as shown in (A), between the output positive voltages based on the respective determination results of the positive / negative sides, there is a moment when the output is 0 and does not exceed a threshold, thus obtaining a signal as shown in (A). Figure 5 The sensor output shown in (B) can detect frequency components and determine them as AC.

[0024] On the other hand, as referenced Figure 2 As explained, when the potential difference between the positive and negative sides changes drastically into a pseudo-sine wave or pulse wave, the output of the determination result based on the positive side voltage overlaps with the output of the determination result based on the negative side voltage. Therefore, the moment when the output is 0 cannot be determined, the frequency component cannot be detected, and it is mistakenly determined to be DC, becoming... Figure 5 The sensor output shown in (C).

[0025] The charging circuit 2 described above in this embodiment is configured with a first sensor S1 and a second sensor S2 as two digital sensors. The first sensor S1 is responsible for the positive output, and the second sensor S2 is responsible for the negative output. This avoids misjudgment as in the comparative example and enables the detection of frequency components.

[0026] The embodiments described above have been illustrated with reference to specific examples. However, the present invention is not limited to these specific examples. Those skilled in the art can make appropriate design modifications to these specific examples, and as long as they possess the features of the present invention, they are also included within the scope of the present invention. The elements, their configurations, conditions, shapes, etc., of the aforementioned specific examples are not limited to the illustrated elements and can be appropriately modified. As long as no technical contradiction arises, the elements of the aforementioned specific examples can be appropriately combined and changed.

[0027] [Postscript]

[0028] [Postscript 1]

[0029] A charging circuit 2 includes: a plurality of power lines through which at least alternating current flows as input current; and a first sensor S1 and a second sensor S2, which measure the voltage of the input current as digital sensors. The plurality of power lines have: an ungrounded power line 21 through which the input current flows to the first sensor S1; a grounded power line 22 through which the current passing through the first sensor S1 flows to the ground side; a branch power line 23 through which current flows to the second sensor S2 from the grounded power line 22; and a confluence power line 24 through which the current passing through the second sensor S2 flows to the ungrounded power line 21.

[0030] According to Appendix 1, the first sensor S1 functions as a digital voltage sensor capable of determining only the presence or absence of voltage on the positive side, and the second sensor S2 functions as a digital voltage sensor capable of determining only the presence or absence of voltage on the negative side. Even if the input current is an AC waveform with poor power quality, such as a pseudo-sine wave, it can be determined using an inexpensive and simple structure. Both AC and DC currents can flow as input currents, and the first sensor S1 and the second sensor S2 determine whether it is a DC current.

[0031] Symbol Explanation

[0032] 2-Charging circuit, 21-Ungrounded power line, 22-Grounded power line, 23-Branch power line, 24-Combined power line, S1-First sensor, S2-Second sensor, D1, D2-Diodes.

Claims

1. A charging circuit, characterized in that, have: Multiple power lines, each carrying at least alternating current as input current; and a first sensor and a second sensor, which measure the voltage of the input current as digital sensors. The plurality of power lines have: The input current of the ungrounded power line flows to the first sensor; The grounding power line carries the current from the first sensor flowing to the grounding side; A branch power line, which branches off from the grounded power line to allow current to flow to the second sensor; and The confluence power line causes the current passing through the second sensor to flow to the ungrounded side power line.

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