CN201269906Y - Working mode switching control circuit for electronic type electrical energy meter - Google Patents
Working mode switching control circuit for electronic type electrical energy meter Download PDFInfo
- Publication number
- CN201269906Y CN201269906Y CNU2008201588858U CN200820158885U CN201269906Y CN 201269906 Y CN201269906 Y CN 201269906Y CN U2008201588858 U CNU2008201588858 U CN U2008201588858U CN 200820158885 U CN200820158885 U CN 200820158885U CN 201269906 Y CN201269906 Y CN 201269906Y
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- working mode
- energy meter
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Abstract
The utility model discloses a control circuit used for switching the working mode of an electronic electric energy meter, which comprises a voltage detection circuit and a power supply circuit for an EEPROM (electrically erasable read only memory). The voltage detection circuit comprises a working mode switch chip TERIDIAN-71M6521 and a partial pressure resistor R27. The input pin of the chip TERIDIAN-71M6521 is connected with one end of the partial pressure resistor R27; the output pin of the chip TERIDIAN-71M6521 is connected with the power supply circuit for the EEPROM; the other end of the partial pressure resistor R27 is connected with a reset chip and a second partial pressure resistor R7; the input terminal of the reset chip is connected with the arranged direct current (DC) power supply threshold voltage so as to ensure that the input voltage of the working mode switch chip is never lower than the critical voltage for switching working mode. The control circuit can ensure that the task mode can be successfully switched to the low power working mode when the condition of power failure or voltage below level occurs.
Description
Technical field
The utility model relates to a kind of control circuit that the electronic electric energy meter mode of operation is switched that is used for
Background technology
The mode of operation of electronic electric energy meter generally is divided into normal operating conditions and low power consumpting state, low power consumpting state is embodied under the situation that civil power disconnects three kinds of patterns, first EEPROM endure guarantees program run, it two is that LCD still can show so that check meter, and it three is to maintain the power supply that is in sleep.Fig. 2 is a kind of electronic electric energy meter mode of operation control switching circuit commonly used in the prior art, from this circuit we as can be seen prior art low-power consumption handled existed tangible deficiency:
1, the V1 pin voltage obtains (during the TERIDIAN-71M6521 operate as normal, the V3P3SYS voltage range is 3.0V-3.6V, and V1 voltage must be higher than VBIAS) by V3P3SYS through the divider resistance dividing potential drop.(VBIAS representative value 1.6V).For the normal working voltage scope that guarantees that V1 has enough anti-jamming margins and guarantees chip, at V3P3SYS during at 3.3V about V1 voltage 1.8V.At the V1 electric voltage dropping during to VBIAS, V3P3SYS voltage is near critical operating voltage 3.0V like this.More cannot say for sure to demonstrate,prove the unanimity of working point during batch process.
2, because the feed circuit of EEPROM electricallyerasable ROM (EEROM) are by the power supply of V3P3SYS point, therefore can not guarantee the operate as normal of EEPROMDE.
3, when V3P3SYS voltage is lower than 3.0V, the TERIDIAN-71M6521 chip can not normally switch makes LCD display random access memory district data can be because of chip RESET clear 0, causes LCD no datat demonstration in appearance.Can't the copy reading liquid crystal display data when application is checked meter in the low-power consumption power failure.
4, TERIDIAN-71M6521 is in the switching repeatedly of MISSION (task) pattern and BROWNOUT (low-power consumption) pattern, if mode switch points V3P3SYS brownout (near or be lower than the critical operating voltage of TERIDIAN-71M6521), TERIDIAN-71M6521 has probability to show battery to switch unsuccessful, directly enter the SLEEP pattern, the mistake of the illegal FLASH ROM of addressing perhaps occurs, and cause the software endless loop.
The utility model content
The purpose of this utility model be to provide a kind of can carry out reliably that mission mode and low-power consumption mode switch be used for electronic electric energy meter mode of operation control switching circuit.
This electronic electric energy meter mode of operation control switching circuit that is used for that the utility model provides, comprise voltage detecting circuit and electricallyerasable ROM (EEROM) feed circuit, described voltage detecting circuit contains mode of operation and switches chip TERIDIAN-71M6521, divider resistance R27, the input pin of chip TERIDIAN-71M6521 is connected with first divider resistance R27 one end, the output pin of chip TERIDIAN-71M6521 is connected with the electricallyerasable ROM (EEROM) feed circuit, the other end that it is characterized in that described divider resistance R27 is connected with reset chip and second divider resistance R7, the input end of the described chip that resets is connected with the direct supply threshold voltage of setting, guarantees that the input voltage of mode of operation switching chip TERIDIAN-71M6521DE is not less than the critical voltage of switch operating all the time.
Because the utility model has increased the chip that resets in voltage detecting circuit, and the input voltage of this chip is set to one and guarantees that chip TERIDIAN-71M6521 input terminal voltage is not less than the threshold voltage of switch operating critical voltage, therefore can guarantee power-down state under or can arrive the mode of operation of low-power consumption by successful switch under the situation of brownout, avoided the inconsistent problem of mode switch points operating voltage in the prior art, solved owing to the mode switch points operating voltage is crossed the low mode switch that causes and directly entered SLEEP pattern abnormal operation, and the unusual problem of FLASH addressing error.
Description of drawings
Fig. 1 is the circuit diagram of an embodiment of the utility model.
Fig. 2 is the circuit diagram of prior art.
Embodiment
The utility model has increased the chip XC61FN3012 that resets on the basis of existing technology with on the voltage detecting circuit as can be seen from Figure 1, the input end of this chip is connected with two resistance R 28 and R29 and a capacitor C 28, output terminal is connected between first divider resistance R27 and second the divider resistance R7, is connected with the input end that mode of operation is switched chip TERIDIAN-71M6521 by first divider resistance R27.During the input of rated DC current AC voltage, VH1 voltage is 14V, when AC power supplies disconnects, the VH1 electric voltage dropping is during to 7.5V (this is the threshold voltage that this circuit is provided with), the input of chip XC61FN3012 of resetting is lower than 3.0V, chip reset XC61FN3012 output this moment OUT is 0, makes input pin V1 voltage that mode of operation switches chip TERIDIAN-71M6521 less than internal reference voltage VBIAS, TERIDIAN-71M6521 by task (MISSION) mode switch to low-power consumption (BROWNOUT) pattern.This moment, V3P3SYS voltage maintained 3.3V always, chip operating voltage does not change when making mode switch, Assured Mode switches and reliably carries out, avoided problem in the prior art as shown in Figure 2, the problem includes: the operating voltage of mode switch points is approaching or the problem and the inconsistent problem of mode switch points operating voltage of subcritical operating voltage, solved owing to the mode switch points operating voltage is crossed the low mode switch that causes and directly entered SLEEP pattern abnormal operation, and the unusual problem of FLASH addressing error.
Electricallyerasable ROM (EEROM) EEPROM is switched the output pin V3P3D power supply of chip TERIDIAN-71M6521 by mode of operation as can be seen from Figure 1, when its input pin V1 greater than internal reference voltage VBIAS, V3P3D is connected to V3P3SYS by internal switch, is powered to EEPROM by the external AC power supply.During less than internal reference voltage VBIAS, if there is battery to exist, TERIDIAN-71M6521 is in the BROWNOUT low-power consumption mode at V1, and V3P3D connects power down pond VBAT by internal switch.Further reducing power consumption can enter SLEEP pattern or LCD pattern by programmed control TERIDIAN-71M6521, and at this moment, TERIDIAN-71M6521 inside will cut off being connected of V3P3D and VBAT.Be directly connected to battery with common scheme EEPROM and compare, in this scheme, TERIDIAN-71M6521 will not have the quiescent current consumption of EEPROM in LCD pattern or SLEEP pattern, and system power dissipation is lower, can prolong battery serviceable life.TERIDIAN-71M6521 is working procedure under MISSION pattern and BROWNOUT pattern only, and when MISSION pattern and BROWNOUT pattern, EEPROM powers, and guarantees normal EERPOM read-write operation.
Claims (2)
1, a kind of electronic electric energy meter mode of operation control switching circuit that is used for, comprise voltage detecting circuit and electricallyerasable ROM (EEROM) feed circuit, described voltage detecting circuit contains mode of operation and switches chip TERIDIAN-71M6521, divider resistance R27, the input pin of chip TERIDIAN-71M6521 is connected with first divider resistance R27 one end, the output pin of chip TERIDIAN-71M6521 is connected with the electricallyerasable ROM (EEROM) feed circuit, the other end that it is characterized in that described divider resistance R27 is connected with reset chip and second divider resistance R7, the input end of the described chip that resets is connected with the direct supply threshold voltage of setting, guarantees that the input voltage of mode of operation switching chip TERIDIAN-71M6521DE is not less than the work critical voltage of switching all the time.
2, the electronic electric energy meter mode of operation control switching circuit that is used for according to claim 1 is characterized in that the described chip that resets is XC61FN3012MR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201588858U CN201269906Y (en) | 2008-10-23 | 2008-10-23 | Working mode switching control circuit for electronic type electrical energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201588858U CN201269906Y (en) | 2008-10-23 | 2008-10-23 | Working mode switching control circuit for electronic type electrical energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201269906Y true CN201269906Y (en) | 2009-07-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201588858U Expired - Lifetime CN201269906Y (en) | 2008-10-23 | 2008-10-23 | Working mode switching control circuit for electronic type electrical energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201269906Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109564265A (en) * | 2016-06-01 | 2019-04-02 | 飞利浦照明控股有限公司 | Error detection on integrated circuit input/output pin |
-
2008
- 2008-10-23 CN CNU2008201588858U patent/CN201269906Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109564265A (en) * | 2016-06-01 | 2019-04-02 | 飞利浦照明控股有限公司 | Error detection on integrated circuit input/output pin |
| CN109564265B (en) * | 2016-06-01 | 2021-08-10 | 昕诺飞控股有限公司 | Error detection on integrated circuit input/output pins |
| US11467211B2 (en) | 2016-06-01 | 2022-10-11 | Signify Holding B.V. | Error detection on integrated circuit input/output pins |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090708 |
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| CX01 | Expiry of patent term |