CN203811652U - Alternate current/direct current shunt sampling circuit of single-phase electric energy meter - Google Patents
Alternate current/direct current shunt sampling circuit of single-phase electric energy meter Download PDFInfo
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- CN203811652U CN203811652U CN201420193561.3U CN201420193561U CN203811652U CN 203811652 U CN203811652 U CN 203811652U CN 201420193561 U CN201420193561 U CN 201420193561U CN 203811652 U CN203811652 U CN 203811652U
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Abstract
The utility model provides an alternate current/direct current shunt sampling circuit of a single-phase electric energy meter. The alternate current/direct current shunt sampling circuit comprises an alternate current/direct current detection circuit and a sampling circuit switching circuit which are connected with alternate current/direct current input terminals, and an alternate current/direct current sampling circuit; wherein the alternate current/direct current detection circuit is connected with the sampling circuit switching circuit, and alternate current/direct current sampling circuit comprises a direct current sampling circuit and an alternate current sampling circuit which are connected with two selection terminals of a change over switch of the sampling circuit switching circuit. Alternate current/direct current shunt sampling is achieved through detection and selection for alternate current/direct current signals, so that preparation is made for shunting metering, and the single phase electric energy meter capable of carrying out alternate current/direct current metering is obtained.
Description
Technical field
The utility model relates to a kind of single-phase electric energy meter alternating current-direct current sample circuit along separate routes, particularly relates to a kind of single-phase electric energy meter alternating current-direct current sample circuit along separate routes that is applicable to electric car electric energy metering.
Background technology
Along with generation of electricity by new energy, electric automobile universal, charging pile demand is increasing, and the demand of DC measurement also can correspondingly be increased.Present stage, electric energy meter on market is all single metering method ammeter, same ammeter cannot doublely be realized AC and DC metering, for charging or the inversion efficiency statistics and analysis of new forms of energy, must install after the AC energy meter and direct current energy meter of different model, again direct current is measured with exchanging respectively, in buying or in management, bring many inconvenience for user.For this present situation, we need badly, and design is a kind of can take into account AC and DC metering on same electric energy meter, dual-purpose electric energy meter, alternating current-direct current is sample circuit along separate routes, realize an electric energy meter and can take into account the dual-purpose electric energy meter that can carry out AC and DC metering, facilitate user to purchase, use and manage electric energy meter.
Utility model content
The technical problems to be solved in the utility model is to provide carries out the alternating current-direct current circuit of sampling along separate routes on same single-phase electric energy meter.
The technical solution adopted in the utility model is as follows: a kind of single-phase electric energy meter alternating current-direct current is sample circuit along separate routes, it is characterized in that: comprise the alternating current-direct current testing circuit and the sample circuit commutation circuit that are connected with alternating current-direct current input end respectively; Described alternating current-direct current testing circuit is connected with sample circuit commutation circuit; Also comprise alternating current-direct current sample circuit; Described alternating current-direct current sample circuit is divided into again direct current sample circuit and exchanges sample circuit, is connected respectively with two selecting sides of the change-over switch of sample circuit commutation circuit.
As preferably, described alternating current-direct current testing circuit is voltage detecting circuit.
As preferably, described voltage detecting circuit comprises current-limiting resistance and Industrial Frequency Transformer, and one end of described current-limiting resistance is connected with combined-voltage input end, and the other end is connected with primary side one end of Industrial Frequency Transformer; The primary side other end of described Industrial Frequency Transformer is connected to the ground; The secondary output end of described Industrial Frequency Transformer is connected with stable output driving circuit; The output control terminal of described stable output driving circuit is connected with the control end of switching circuit.
As preferably, described stable output driving circuit comprises commutation diode, electrochemical capacitor, flow-limiting voltage-stabilizing resistance, voltage stabilizing diode and filter capacitor; The positive pole of described commutation diode is connected with secondary output end one end of Industrial Frequency Transformer, and negative pole is connected with one end of flow-limiting voltage-stabilizing resistance with the positive pole of electrochemical capacitor respectively; The secondary output end other end of described Industrial Frequency Transformer and the minus earth of electrochemical capacitor; The positive pole of described voltage stabilizing diode is connected to the ground, and negative pole is connected with the other end of flow-limiting voltage-stabilizing resistance; Described filter capacitor is in parallel with voltage stabilizing diode.
As preferably, described stable output driving circuit also comprises the voltage regulation resistance in parallel with voltage stabilizing diode.
As preferably, described sample circuit commutation circuit is relay switch circuit.
As preferably, described relay is single-pole double-throw (SPDT) relay, and described direct current sample circuit is connected with the normally closed selecting side of relay switch switch, and described interchange sample circuit is connected with another selecting side of relay switch switch.
As preferably, described direct current sample circuit comprises DC partial voltage resistance.
As preferably, described interchange sample circuit comprises interchange divider resistance.
Compared with prior art, the beneficial effects of the utility model are: the utility model is by detection and selection to alternating current-direct current signal, realize direct current and the shunt sampling exchanging, thus ready for measuring along separate routes, the single-phase electric energy meter that further can carry out AC/DC metering.
Brief description of the drawings
Fig. 1 is the wherein principle schematic of an embodiment of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Disclosed arbitrary feature in this instructions (comprising any accessory claim, summary and accompanying drawing), unless narration especially all can be replaced by other equivalences or the alternative features with similar object.,, unless narration especially, each feature is an example in a series of equivalences or similar characteristics.
As shown in Figure 1, a kind of single-phase electric energy meter alternating current-direct current is sample circuit along separate routes, comprises the alternating current-direct current testing circuit 1 and the sample circuit commutation circuit 2 that are connected with alternating current-direct current input end respectively; Described alternating current-direct current testing circuit 1 is connected with sample circuit commutation circuit 2; Also comprise alternating current-direct current sample circuit; Described alternating current-direct current sample circuit is divided into again direct current sample circuit 31 and exchanges sample circuit 32, is connected respectively with two selecting sides of the change-over switch of sample circuit commutation circuit 2.
In this specific embodiment, described alternating current-direct current testing circuit 1 is voltage detecting circuit.
Described voltage detecting circuit comprises current-limiting resistance R1 and Industrial Frequency Transformer T1, and one end of described current-limiting resistance R1 is connected with combined-voltage input end, and the other end is connected with primary side one end of Industrial Frequency Transformer T1; The primary side other end of described Industrial Frequency Transformer T1 is connected to the ground; The secondary output end of described Industrial Frequency Transformer T1 is connected with stable output driving circuit 11; The output control terminal of described stable output driving circuit 11 is connected with the control end of switching circuit 2.
In this specific embodiment, described stable output driving circuit 11 comprises commutation diode D1, electrochemical capacitor C1, flow-limiting voltage-stabilizing resistance R 4, voltage stabilizing diode D2 and filter capacitor C2; The positive pole of described commutation diode D1 is connected with secondary output end one end of Industrial Frequency Transformer T1, and negative pole is connected with one end of flow-limiting voltage-stabilizing resistance R 4 with the positive pole of electrochemical capacitor C1 respectively; The secondary output end other end of described Industrial Frequency Transformer T1 and the minus earth of electrochemical capacitor C1; The positive pole of described voltage stabilizing diode D2 is connected to the ground, and negative pole is connected with the other end of flow-limiting voltage-stabilizing resistance R 4; Described filter capacitor C2 is in parallel with voltage stabilizing diode D2.In this specific embodiment, in the time of the input AC of voltage detecting loop, Industrial Frequency Transformer is secondary can export a 10V alternating voltage, and after D1 rectification, by voltage stabilizing diode D2 burning voltage, the control voltage that voltage stabilizing is 5.1V, controls commutation circuit.
Described sample circuit commutation circuit 2 is relay switch circuit.
In this specific embodiment, described stable output driving circuit 11 also comprises the voltage regulation resistance R5 in parallel with voltage stabilizing diode D2.For direct current signal, because Industrial Frequency Transformer does not have Voltage-output, play a stabilization to the signal of controlling triode Q1 base stage, avoid level-shift to cause commutation circuit malfunction.
Described relay is single-pole double-throw (SPDT) relay, and described direct current sample circuit 31 is connected with the normally closed selecting side of relay switch switch, and described interchange sample circuit 32 is connected with another selecting side of relay switch switch.
Described direct current sample circuit comprises DC partial voltage resistance.In this specific embodiment, due to withstand voltage demand, need multiple resistance series connection dividing potential drop composition DC partial voltage resistance.
Described interchange sample circuit comprises interchange divider resistance.In this specific embodiment, due to withstand voltage demand, need multiple resistance series connection dividing potential drop compositions to exchange divider resistance.
Outside interchange or DC voltage are received on Industrial Frequency Transformer T1 elementary through current-limiting resistance R1, because DC voltage can not output to secondary winding by Industrial Frequency Transformer T1, only have alternating voltage could pass through Industrial Frequency Transformer T1 output voltage on secondary, according to the characteristic of Industrial Frequency Transformer T1, can realize by hardware circuit the judgement of AC signal, and drive sample circuit commutation circuit 2 to automatically switch.When alternating voltage process Industrial Frequency Transformer T1 is at secondary output voltage, then carry out after half-wave rectification filtering, then by the voltage stabilizing diode of 5.1V, voltage voltage stabilizing is arrived to 5.1V, get and drive sample circuit commutation circuit relay with this 5.1V voltage of voltage regulation, realize and switch the switching that exchanges sample circuit.What connect when outside is DC voltage, because Industrial Frequency Transformer secondary output voltage is 0, therefore relay is failure to actuate, is maintained to normally off, and relay normal-closed end is direct current sample circuit, has realized automatic switchover like this from hardware.
In this specific embodiment, during due to DC measurement, voltage is generally all near 750V, and while exchanging metering, voltage is all near 220V; For guaranteeing accurate-metering, circuit design, by d. c. voltage signal and ac voltage signal, adopts different sample circuits to sample, and guarantee voltage input signal meets the demands like this.Consider the convenience that user uses, when circuit design, adopt small-sized relay to switch, the resistance that can ensure like this commutation circuit contact on whole sampled signal almost without affecting; It is small-sized single-pole double-throw (SPDT) relay that commutation circuit adopts, and realizes automatically switching control by voltage detecting circuit.
Because alternating voltage and DC voltage input voltage differ greatly, exchange about 220V, direct current 750V, because the voltage input signal scope of computation chip is narrower, cannot use same sample circuit to carry out voltage signal sampling, therefore being divided into 2 circuit by circuit design, interchange and DC voltage sample, preferably head it off.
The last computation chip that can carry out AC-DC two-way metering that adopts again, just can realize blow-up DC dual-purpose electric energy meter.
Claims (9)
1. a single-phase electric energy meter alternating current-direct current sample circuit along separate routes, is characterized in that: comprise the alternating current-direct current testing circuit and the sample circuit commutation circuit that are connected with alternating current-direct current input end respectively; Described alternating current-direct current testing circuit is connected with sample circuit commutation circuit; Also comprise alternating current-direct current sample circuit; Described alternating current-direct current sample circuit is divided into again direct current sample circuit and exchanges sample circuit, is connected respectively with two selecting sides of the change-over switch of sample circuit commutation circuit.
2. single-phase electric energy meter alternating current-direct current according to claim 1 sample circuit along separate routes, is characterized in that: described alternating current-direct current testing circuit is voltage detecting circuit.
3. single-phase electric energy meter alternating current-direct current according to claim 2 sample circuit along separate routes, it is characterized in that: described voltage detecting circuit comprises current-limiting resistance and Industrial Frequency Transformer, one end of described current-limiting resistance is connected with combined-voltage input end, and the other end is connected with primary side one end of Industrial Frequency Transformer; The primary side other end of described Industrial Frequency Transformer is connected to the ground; The secondary output end of described Industrial Frequency Transformer is connected with stable output driving circuit; The output control terminal of described stable output driving circuit is connected with the control end of switching circuit.
4. single-phase electric energy meter alternating current-direct current according to claim 3 sample circuit along separate routes, is characterized in that: described stable output driving circuit comprises commutation diode, electrochemical capacitor, flow-limiting voltage-stabilizing resistance, voltage stabilizing diode and filter capacitor; The positive pole of described commutation diode is connected with secondary output end one end of Industrial Frequency Transformer, and negative pole is connected with one end of flow-limiting voltage-stabilizing resistance with the positive pole of electrochemical capacitor respectively; The secondary output end other end of described Industrial Frequency Transformer and the minus earth of electrochemical capacitor; The positive pole of described voltage stabilizing diode is connected to the ground, and negative pole is connected with the other end of flow-limiting voltage-stabilizing resistance; Described filter capacitor is in parallel with voltage stabilizing diode.
5. single-phase electric energy meter alternating current-direct current according to claim 3 sample circuit along separate routes, is characterized in that: described stable output driving circuit also comprises the voltage regulation resistance in parallel with voltage stabilizing diode.
6. single-phase electric energy meter alternating current-direct current according to claim 1 sample circuit along separate routes, is characterized in that: described sample circuit commutation circuit is relay switch circuit.
7. single-phase electric energy meter alternating current-direct current according to claim 6 sample circuit along separate routes, it is characterized in that: described relay is single-pole double-throw (SPDT) relay, described direct current sample circuit is connected with the normally closed selecting side of relay switch switch, and described interchange sample circuit is connected with another selecting side of relay switch switch.
8. single-phase electric energy meter alternating current-direct current according to claim 1 sample circuit along separate routes, is characterized in that: described direct current sample circuit comprises DC partial voltage resistance.
9. single-phase electric energy meter alternating current-direct current according to claim 1 sample circuit along separate routes, is characterized in that: described interchange sample circuit comprises interchange divider resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420193561.3U CN203811652U (en) | 2014-04-21 | 2014-04-21 | Alternate current/direct current shunt sampling circuit of single-phase electric energy meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420193561.3U CN203811652U (en) | 2014-04-21 | 2014-04-21 | Alternate current/direct current shunt sampling circuit of single-phase electric energy meter |
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| CN203811652U true CN203811652U (en) | 2014-09-03 |
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| CN201420193561.3U Expired - Fee Related CN203811652U (en) | 2014-04-21 | 2014-04-21 | Alternate current/direct current shunt sampling circuit of single-phase electric energy meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108375696A (en) * | 2018-03-26 | 2018-08-07 | 珠海格力电器股份有限公司 | Power Quality Monitor Device and method, electric energy meter |
-
2014
- 2014-04-21 CN CN201420193561.3U patent/CN203811652U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108375696A (en) * | 2018-03-26 | 2018-08-07 | 珠海格力电器股份有限公司 | Power Quality Monitor Device and method, electric energy meter |
| WO2019184454A1 (en) * | 2018-03-26 | 2019-10-03 | 珠海格力电器股份有限公司 | Electric energy monitoring device and method, and electric energy meter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140903 Termination date: 20150421 |
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| EXPY | Termination of patent right or utility model |