CN201965449U - Negative-voltage shutoff circuit - Google Patents
Negative-voltage shutoff circuit Download PDFInfo
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- CN201965449U CN201965449U CN2010205931219U CN201020593121U CN201965449U CN 201965449 U CN201965449 U CN 201965449U CN 2010205931219 U CN2010205931219 U CN 2010205931219U CN 201020593121 U CN201020593121 U CN 201020593121U CN 201965449 U CN201965449 U CN 201965449U
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- switch triode
- triode
- negative
- stage switching
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Abstract
The utility model relates to a negative-voltage shutoff circuit, which is controlled by a control chip and is characterized in that the circuit comprises a first-stage switching triode Q1 with a base which is connected with the control chip, the collector of the first-stage switching triode Q1 is connected with the base of a second-stage switching triode which controls the closing and the opening of the posterior circuit through a current limiting resistor R21, the collector of the second-stage switching triode is connected with the base of a third-stage switching triode which directly controls the closing and the opening of the negative-voltage circuit through a current limiting resistor, the emitter and the collector of the third-stage switching triode are serially connected into the negative-pressure circuit, the first-stage switching triode Q1 and the third-stage switching triode are NPN-type triodes and the second-stage switching triode is a PNP-type triode. The negative-voltage shutoff circuit has the advantages that the shutoff control of the negative-voltage circuit is realized by using common triodes and resistors only, the cost is low, no current passes through any electronic element when the circuit is shut off, electric energy is not lost, the power consumption of the equipment of a display can be effectively reduced and the requirements on energy saving, emission reduction and sustainable development are satisfied.
Description
[technical field]
The utility model relates to a kind of control circuit, specifically a kind of negative voltage breaking circuit.
[background technology]
Use the equipment of VFD (Vacuum Fluorescent Display, vacuum fluorescent display screen) a lot, as DVD panel, various household electrical appliance panels etc.Such as in blue-ray DVD, comprise servo module, decoder module, power module, button and the VFD display module of mutual electrical connection, because of the U.S. carries out Energy Star 2.0 standard-required stand-by power consumptions below 1W.And blue light is long owing to system complex, on time, and the purpose that false holding state reaches quick turn-on is arranged in its standby.Because master chip and interior nonresident portion are all being worked, its power consumption control has just become difficult point during the vacation standby.The blue-ray DVD that band VFD shows since the VFD screen use grid voltage (24V～-30V, the back is in order to-24 designates) and filament voltage (F1-F2=3.5V, the back is referred to as Vac), the grid voltage that superposeed on the filament voltage Vac also become negative pressure (as-15.5 and-19V).Because pressure reduction is big, power panel is difficult to turn-off, and can consume certain power when standby.Supposing the system stand-by power consumption 0.7W, if do not turn-off, grid voltage and filament voltage can consume about 0.5W, then 0.7W+0.5W can exceed the 1W standard.
[utility model content]
In view of this, the technical problems to be solved in the utility model provides and a kind ofly can turn-off the negative pressure circuit effectively simultaneously, designs negative voltage breaking circuit cleverly.
In order to solve the problems of the technologies described above, the utility model is realized in the following way:
A kind of negative voltage breaking circuit, control by control chip, this circuit comprises that a base stage is connected the one-level switch triode Q1 that is used to control the entire circuit break-make with control chip, the collector of one-level switch triode Q1 is connected with the base stage of the secondary switch triode of control rear portion connecting and disconnecting of the circuit by current-limiting resistance R21, the collector of secondary switch triode is connected with the base stage that directly controls the three step switch triode of negative voltage connecting and disconnecting of the circuit by current-limiting resistance, the emitter and collector of three step switch triode is series in the negative voltage circuit, described one-level switch triode Q1 and three step switch triode are NPN type triode, and the secondary switch triode is the positive-negative-positive triode.
As improvement to such scheme, described secondary switch triode and three step switch triode are one or more, the collector of each secondary switch triode is connected by the base stage of current-limiting resistance with a three step switch triode respectively, and each three step switch triode is controlled independently negative voltage circuit respectively.
Wherein, all be connected with biasing resistor between described three step switch transistor base and the emitter.
Wherein, all be connected with biasing resistor between described secondary switch transistor base and the emitter.
Wherein, described one-level switch triode Q1 grounded emitter.
The utility model only adopts common triode and resistance promptly to realize the control that the negative pressure circuit is turn-offed, cost is low, and all electronic components all do not have electric current to pass through during shutoff, no electric energy loss, can effectively reduce the power consumption of the equipment that adopts display screen, meet the sustainable development requirement of energy-saving and emission-reduction.
[description of drawings]
Fig. 1 is the utility model embodiment circuit draw bail synoptic diagram.
[embodiment]
At the defective of prior art existence, below it will be appreciated by those skilled in the art that
Describe in further detail of the present utility model in conjunction with the accompanying drawings:
As shown in Figure 1, the negative voltage breaking circuit that present embodiment discloses is used for controlling the power supply control of the VDF screen of blue-ray DVD, and this VDF power supply comprises-grid power supply and the filament supply F1 (Vac) of 24V, two power supplys are superposed to negative voltage.This circuit is by the control of the control chip in the blue-ray DVD, thereby control chip is controlled the break-make of the whole negative voltage circuit of this negative voltage breaking circuit work control VDF by sending high level and low level.
In the present embodiment, this circuit comprises the NPN type one-level switch triode Q1 that a base stage is connected with control chip by current-limiting resistance R20, the break-make of this one-level switch triode Q1 may command entire circuit.The collector of one-level switch triode Q1 is connected with the base stage of two positive-negative-positive secondary switch triode Q2, middle triode Q4 by current-limiting resistance R21, the collector of two secondary switch triode Q2, middle triode Q4 is connected with two NPN type three step switch triode Q3 of direct control negative voltage connecting and disconnecting of the circuit, the base stage of three step switch triode Q5 by current-limiting resistance R23, current-limiting resistance R28 respectively, and the emitter and collector of two or three grade of switch triode is series in the negative voltage circuit.Two secondary switch triodes of one-level switch triode Q1 may command break-make, two secondary switch triodes are then controlled two or three grade of switch triode break-make respectively simultaneously, and control can be finished the break-make control to two independent negative voltage circuit simultaneously so step by step.And, between the base stage of two or three grade of switch triode Q3, three step switch triode Q5 and emitter, be connected with biasing resistor R25, biasing resistor R29 respectively, between the base stage of two secondary switch triode Q2, middle triode Q4 and emitter, all connect by biasing resistor R22, and the grounded emitter of one-level switch triode Q1.By adjusting the parameter of each resistance, can make entire circuit reach good working order.
Present embodiment is done the break-make that resistor group is controlled two groups of negative voltage circuit simultaneously by comprising two PNP triodes 3906, three NPN triodes 8050 and promise.Control chip is sent high level to the base stage of one-level switch triode Q1, and one-level switch triode Q1 conducting makes secondary switch triode Q2, three step switch triode Q3 conducting successively, thereby makes-24V negative voltage circuit turn-on; Simultaneously,, make secondary switch triode Q4, also conducting of three step switch triode Q5 successively along with the conducting of one-level switch triode Q1, another road F1 (Vac) circuit turn-on, the two-way power supply superposes as the VDF working power.Control chip is sent low level to the base stage of one-level switch triode Q1, and one-level switch triode Q1 ends, and secondary switch triode Q2, three step switch triode Q3 is ended, thereby make-disconnection of 24V negative voltage circuit; Simultaneously, along with ending of one-level switch triode Q1, secondary switch triode Q4, three step switch triode Q5 are also ended, another road F1 (Vac) negative voltage circuit ends.Because when control chip was sent low level, all triodes all ended, the power consumption hardly of this circuit.And only use common triode and resistance, cost is low, and effect is very good.
Above embodiment only is the preferable implementation of the utility model; can not limit protection domain of the present utility model with this; under the present utility model design prerequisite that do not come off; still may there be the distortion that belongs within the utility model protection domain; can be multichannel as secondary switch triode and corresponding three step switch triode; respectively the break-make of a plurality of negative voltage circuit is controlled simultaneously; and control chip can be single-chip microcomputer or microprocessor etc., and so similar conspicuous variation all belongs to protection domain of the present utility model.
Claims (5)
1. negative voltage breaking circuit, control by control chip, it is characterized in that, this circuit comprises that a base stage is connected the one-level switch triode Q1 that is used to control the entire circuit break-make with control chip, the collector of one-level switch triode Q1 is connected with the base stage of the secondary switch triode of control rear portion connecting and disconnecting of the circuit by current-limiting resistance R21, the collector of secondary switch triode is connected with the base stage that directly controls the three step switch triode of negative voltage connecting and disconnecting of the circuit by current-limiting resistance, the emitter and collector of three step switch triode is series in the negative voltage circuit, described one-level switch triode Q1 and three step switch triode are NPN type triode, and the secondary switch triode is the positive-negative-positive triode.
2. negative voltage breaking circuit according to claim 1, it is characterized in that: described secondary switch triode and three step switch triode are one or more, the collector of each secondary switch triode is connected by the base stage of current-limiting resistance with a three step switch triode respectively, and each three step switch triode is controlled independently negative voltage circuit respectively.
3. negative voltage breaking circuit according to claim 2 is characterized in that: all be connected with biasing resistor between described three step switch transistor base and the emitter.
4. negative voltage breaking circuit according to claim 2 is characterized in that: all be connected with biasing resistor between described secondary switch transistor base and the emitter.
5. negative voltage breaking circuit according to claim 2 is characterized in that: described one-level switch triode Q1 grounded emitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205931219U CN201965449U (en) | 2010-11-02 | 2010-11-02 | Negative-voltage shutoff circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205931219U CN201965449U (en) | 2010-11-02 | 2010-11-02 | Negative-voltage shutoff circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201965449U true CN201965449U (en) | 2011-09-07 |
Family
ID=44527995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205931219U Expired - Fee Related CN201965449U (en) | 2010-11-02 | 2010-11-02 | Negative-voltage shutoff circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201965449U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105963891A (en) * | 2016-06-16 | 2016-09-28 | 蚌埠依爱消防电子有限责任公司 | Start-stop switching circuit controlled by two wires, terminal load, detection circuit and detection method |
-
2010
- 2010-11-02 CN CN2010205931219U patent/CN201965449U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105963891A (en) * | 2016-06-16 | 2016-09-28 | 蚌埠依爱消防电子有限责任公司 | Start-stop switching circuit controlled by two wires, terminal load, detection circuit and detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20110907 Termination date: 20151102 |
|
| EXPY | Termination of patent right or utility model |