CN200966038Y - Two-wire electronic switch power supply circuit - Google Patents
Two-wire electronic switch power supply circuit Download PDFInfo
- Publication number
- CN200966038Y CN200966038Y CN 200620118432 CN200620118432U CN200966038Y CN 200966038 Y CN200966038 Y CN 200966038Y CN 200620118432 CN200620118432 CN 200620118432 CN 200620118432 U CN200620118432 U CN 200620118432U CN 200966038 Y CN200966038 Y CN 200966038Y
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- China
- Prior art keywords
- power supply
- switch
- control circuit
- current control
- transient current
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Abstract
The utility model relates to a power supply circuit with a two-wire system electronic switch, which comprises an on-state power supply unit, an off-state power supply unit with an AC-DC transform circuit and a voltage-stabilizing and wave-filtering unit. The off-state power supply unit also comprises a transient current controlling circuit. As long as a control unit assures a sufficiently low static power consumption, not only the static current of the switch can be controlled to reach the weakest limit in order to maintain the switch system to be in the dormant and standby status through the transient current controlling circuit, but also the sufficient working current can be supplied to the control unit and a driven element in a moment when the switch is turned on to make the switch turn on accurately. The utility model solves the twinkling problem of the load luminaires, and the load RC-component need not to be arranged and the common switch can be directly replaced conveniently. The utility model is suitable for being used for various luminaires and makes the popularization and application of the two-wire system electronic switch become a possibility.
Description
Technical field
The utility model relates to a kind of two lines system electronic switch power supply circuits, is mainly used in the electronic wall wall switch, belongs to electricity field.
Background technology
In the prior art, the power supply of two-wire system (no zero line input) electronic wall wall switch other circuit (as control circuit, driving element etc.) except that power supply circuits is employing method of supplying power to (OFF state method of supplying power to by the power taking in the voltage circuit of power circuit of OFF state power supply circuits when switch cuts out, its circuit is called the OFF state power supply circuits), when switch open by the method for supplying power to (ON state method of supplying power to, its circuit is called power supply circuit) of power supply circuit power taking in the current circuit of power circuit.The OFF state method of supplying power to generally adopts resistance-capacitance depressurization rectifying and wave-filtering or the filtering of transformer step-down rectifier, when switch cuts out, need keep normal stand-by operation and consume less power owing to the control circuit of switch, and at the bigger power of the instant shut-in consumption of switch open, all the more so as the driving element of switch for relay.Even control circuit and microcontroller stand-by power consumption when switch cuts out is very low, for the normal unlatching that guarantees switch needs bigger with the design of OFF state supply current, more than or equal to the maximum operating currenbt of switch, otherwise rapid decline of the instantaneous voltage of switch open makes control circuit can not continue operate as normal.Therefore, still have bigger standby current to flow through switch when switch cuts out, scintillation can take place in light fixture when load is electricity-saving lamp and fluorescent lamp.In order not make the light fixture flicker, Resistor-Capacitor Unit in parallel is as the method for coad connector at the load two ends in the employing that has, and this has just increased installation difficulty, makes electronic switch be difficult to promote.
Summary of the invention
The purpose of this utility model is to provide a kind of two lines system electronic switch power supply circuits, when switch cuts out, provide very little electric current to control circuit in order to keep stand-by operation, when the instantaneous elder generation of switch open provides bigger operating current to make switch open to control unit and driving element by control unit control OFF state power supply unit, change the ON state power supply state over to; Control unit controls OFF state power supply unit enters big current work state in advance when switch cuts out, and replenishes the power that switch cuts out Instantaneous Control unit and driving element consumption rapidly, makes the voltage at power filtering capacitor two ends maintain rated value.Be used for solving the problem that background technology exists.
The technical solution of the utility model is: a kind of two lines system electronic switch power supply circuits, comprise the ON state power supply unit, OFF state power supply unit and voltage regulation filtering unit, it is characterized in that: the OFF state power supply unit also comprises the transient current control circuit, when sending control signal by the control port of control unit, the instantaneous elder generation of switch open gives coupled transient current control circuit, the transient current control circuit provides bigger operating current to control unit and driving element instantaneous by the voltage regulation filtering unit, make switch open by the control unit control driving component again, change the ON state power supply state over to; Control unit controls OFF state power supply unit enters big current work state in advance when switch cuts out, replenish switch rapidly and close the power of Instantaneous Control unit and driving element consumption, make the voltage at power filtering capacitor two ends maintain rated value, the transient current control circuit is kept very low electric current and is entered the use of dormancy holding state for control unit then.
The utility model compared with prior art has the following advantages:
As long as control unit guarantees to have enough low quiescent dissipation, just can make the quiescent current control of switch enter the dormancy standby to keep switching system by the transient current control circuit to bottom line, again can be at the instantaneous operating current of abundance that provides of switch open to control unit and driving element, switch is accurately opened, solved the problem of load light fixture flicker, and without the installation load Resistor-Capacitor Unit, can make things convenient for and directly replace regular tap, be fit to various light fixtures and use, make applying of two lines system electronic switch become possibility.
Description of drawings
Accompanying drawing is a theory diagram of the present utility model.
Embodiment
Referring to accompanying drawing, the AC-DC translation circuit can adopt resistance-capacitance depressurization commonly used, rectifier system to carry out voltage transformation, available full-wave rectification, also available halfwave rectifier.The input IN of the output termination transient current control circuit of AC-DC translation circuit.The output of the output of transient current control circuit (both outputs of OFF state power supply unit) OUT and ON state power supply unit all is connected with the VCC of voltage regulation filtering unit.Stable DC voltage VCC through the output of voltage regulation filtering unit is added in connected Current Control input port.The Current Control output port of control unit is connected with the Current Control input port Ctrl of transient current control circuit.
The transient current control circuit comprises R1～R4, field effect transistor Q1 and Q2, capacitor C 1, diode D1; The positive pole of diode D1 is as the input IN of transient current control circuit, and negative pole is connected with the drain electrode of field effect transistor Q1 and the end of R1; The source electrode of field effect transistor Q1 is connected with the end of R3, and the end of the other end of R3 and R4 is connected to form the output port OUT of transient current control circuit.The grid of field effect transistor Q1 is connected with R2, and the other end of R2 is connected with the drain electrode of the other end of R1 and field effect transistor Q2; The grid of field effect transistor Q2 is connected with the end of the other end of R4 and C1, and as the Current Control input port Ctrl of transient current control circuit; The source electrode of field effect transistor Q2 is connected to form public ground with the other end of C1 and is connected with the direct current of each unit of switch publicly.
When switch is in closed condition, L, the N two ends add the moment of 220V alternating voltage, Q2 ends, Q1 is by resistance R 1, R2 obtains higher grid voltage and is in abundant conducting state, there is big electric current to flow through the source electrode of Q1, deliver to the voltage regulation filtering unit through current-limiting resistor voltage divider R3, electric capacity in the voltage regulation filtering unit has played the effect of store electrical energy simultaneously, make system obtain operating voltage VCC through voltage regulation filtering, the grid of Q2 obtains voltage and conducting through R4 when the OUT of transient current control circuit port voltage raises, the grid voltage of Q1 decreases, after the OUT port voltage is elevated to VCC, the grid of Q1 obtains lower voltage and is in low conducting state, as long as the quiescent dissipation of control unit is enough low, Q1 is in that system still can keep operating voltage at rated value under the low conducting state.
When switch open, give the current input terminal mouth Ctrl of connected transient current control circuit earlier by low level of control port output of control unit, be input to the grid of Q2, Q2 ends, Q1 obtains higher grid voltage and fully conducting by R1, R2, the transient current control circuit provides bigger operating current to control unit and driving element instantaneous through the voltage regulation filtering unit, make switch open by the control unit control driving component again, change the ON state power supply state over to.OFF state power supply circuits lost voltage and quit work this moment, and the control port of control unit obtains high level through pull-up resistor R4, also can be converted into low level by control unit, and closing for switch instantaneously provides big electric current power supply to prepare in advance.
When cutting out, switch gives connected transient current control circuit Current Control input port Ctrl by a control port low level of output (or remaining low level state before aforesaid the closing) of control unit earlier, instantaneous after switch cuts out, the input of transient current control circuit obtains voltage and current, Q2 ends, Q1 is by R1, R2 obtains higher grid voltage and fully conducting, output current is increased, the transient current control circuit provides bigger operating current at instantaneous voltage regulation filtering unit and the control unit given, power and switch that rapidly additional switch cuts out Instantaneous Control unit and driving element consumption are closed the stored electric energy of capacitor in the instantaneous voltage regulation filtering unit that consumes by being opened to, make the voltage at two ends, voltage regulation filtering unit maintain rated value, the control port of control unit output high level is given connected transient current control circuit Current Control input port Ctrl then, the Q2 conducting, Q1 is in low conducting state, and the transient current control circuit is kept very low electric current and entered the use of dormancy holding state for control unit.
Claims (2)
1, a kind of two lines system electronic switch power supply circuits comprise ON state power supply unit, OFF state power supply unit and voltage regulation filtering unit, and it is characterized in that: the OFF state power supply unit also comprises the transient current control circuit.
2, power circuit according to claim 1 is characterized in that: the transient current control circuit comprises resistance R 1～R4, field effect transistor Q1 and Q2, capacitor C 1, diode D1;
The drain electrode of field effect transistor Q1 is connected the input IN as the transient current control circuit with the end of R1;
The source electrode of field effect transistor Q1 is connected with the end of R3, R4, transient state diode D1, and the other end of R3 forms the output OUT of transient current control circuit;
The grid of field effect transistor Q1 is connected with the end of R2, and the other end of R2 is connected with the drain electrode of the other end of R1 and field effect transistor Q2;
The grid of field effect transistor Q2 is connected with the end of the other end of R4, C1 and as the Current Control input port Ctrl of transient current control circuit;
The source electrode of field effect transistor Q2 forms public ground with the other end of C1 and is connected with the direct current of each unit of switch publicly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620118432 CN200966038Y (en) | 2006-06-08 | 2006-06-08 | Two-wire electronic switch power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620118432 CN200966038Y (en) | 2006-06-08 | 2006-06-08 | Two-wire electronic switch power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200966038Y true CN200966038Y (en) | 2007-10-24 |
Family
ID=38870057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620118432 Expired - Fee Related CN200966038Y (en) | 2006-06-08 | 2006-06-08 | Two-wire electronic switch power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200966038Y (en) |
-
2006
- 2006-06-08 CN CN 200620118432 patent/CN200966038Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |