CN111276093A - Low-cost drive circuit of programming device VPP high-voltage circuit - Google Patents
Low-cost drive circuit of programming device VPP high-voltage circuit Download PDFInfo
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- CN111276093A CN111276093A CN202010198191.2A CN202010198191A CN111276093A CN 111276093 A CN111276093 A CN 111276093A CN 202010198191 A CN202010198191 A CN 202010198191A CN 111276093 A CN111276093 A CN 111276093A
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- 230000000087 stabilizing effect Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses a low-cost driving circuit of a programming device VPP high-voltage circuit, which comprises a triode QP1, a triode QC1, a triode QN1, a voltage stabilizing diode ZD1 and a constant current driving chip U1, wherein a pin OUT0 of the constant current driving chip U1 is connected with an anode of the voltage stabilizing diode ZD1, a cathode of the voltage stabilizing diode ZD1 is connected with a base of a triode QP1, an emitter of the triode QP1 is connected with voltage VPP, and a collector of the triode QP1 is connected with a collector of the triode QN1, a cathode of a diode D1 and a ZIF locking seat.
Description
Technical Field
The invention relates to the technical field of driving, in particular to a low-cost driving circuit of a programming unit VPP high-voltage circuit.
Background
Currently, in all-drive general programmers of other companies, the VCC/VPP/GND drive structure is shown in fig. 1 (actual products have the same drive circuit from 48 to 144 paths), ZIF is a programming lock socket interface, and is connected to pins of a target chip, and the functions of these pins may be general IO, chip power supply VDD (usually 1.2V to 6.5V), chip programming high-voltage VPP (usually 6.2V to 25V) or power supply GND, so that the circuit shown in fig. 1 needs to be configured to complete the VCC/VPP/GND switching function. The circuit structure uses too many components, so that the cost is higher, the product volume is overlarge, and the carrying is inconvenient.
If the problem needs to be solved, only two ways exist, the first method is to make the multiple groups of driving circuits into a special chip, and the team of the work is already in charge of verification and has huge cost; the second method is to adopt a 16-channel constant current driving chip special for a cheap full-color LED screen to improve the original circuit, reduce the cost of components and reduce the volume of products. However, a problem to be solved by this solution is that in commercially available constant current driving chips, such as SB16726, ICN2026, etc., the voltage at the OUT terminal is usually between 17V and 20V, while the voltage at the VPP of the programmer is as high as 25V, and direct use will result in breakdown of the OUT terminal of the constant current chip.
Disclosure of Invention
The present invention is directed to a low-cost driving circuit of a high-voltage circuit of a programmer VPP, so as to solve the problems of the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a low-cost driving circuit of a programmer VPP high-voltage circuit comprises a triode QP1, a triode QC1, a triode QN1, a zener diode ZD1 and a constant current driving chip U1, wherein a pin OUT0 of the constant current driving chip U1 is connected with an anode of a zener diode ZD1, a cathode of the zener diode ZD1 is connected with a base of a triode QP1, an emitter of the triode QP1 is connected with voltage VPP, a collector of the triode QP1 is connected with a collector of the triode QN1, a cathode of a diode D1 and a ZIF locking seat, an anode of a diode D1 is connected with a collector of a QC1, a base of a QC1 is connected with a VDD constant current driving chip, an emitter of the triode QC1 is connected with a power supply VDD, and a base of the triode QN.
As a further scheme of the invention: the voltage VPP is at most 25V.
As a further scheme of the invention: the voltage VDD is up to 6.5V.
As a further scheme of the invention: the model of the constant current driving chip U1 is ICN2026 or SB 16726.
As a further scheme of the invention: the voltage stabilizing diode ZD1 is a voltage stabilizing diode, and the voltage withstanding range of the voltage stabilizing diode is 4.7V-8.2V.
As a further scheme of the invention: the transistor QP1 is a PNP transistor.
As a further scheme of the invention: the triode QC1 is a PNP triode.
Compared with the prior art, the invention has the beneficial effects that: the invention can reduce the cost of the VDD/VPP/GND driving circuit of the general programmer product by 50%, reduce the circuit board area of the driving circuit by 50%, and greatly enhance the product competitiveness.
Drawings
Fig. 1 is a circuit diagram of the prior art.
Fig. 2 is a circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, embodiment 1: in the embodiment of the invention, the low-cost driving circuit of the high-voltage circuit of the programmer VPP comprises a triode QP1, a triode QC1, a triode QN1, a zener diode ZD1 and a constant-current driving chip U1, wherein a pin OUT0 of the constant-current driving chip U1 is connected with an anode of the zener diode ZD1, a cathode of the zener diode ZD1 is connected with a base of the triode QP1, an emitter of the triode QP1 is connected with the voltage VPP, a collector of the triode QP1 is connected with a collector of the triode QN1, a cathode of a diode D1 and a ZIF locking seat, an anode of the diode D1 is connected with a collector of the triode QC1, a base of the triode QC1 is connected with the VDD constant-current driving chip, an emitter of the triode QC1 is connected with a power.
The problem that the VPP high voltage exceeds the withstand voltage of the OUT end of the constant current chip is solved by connecting a voltage regulator tube ZD1 in series in a constant current driving circuit.
As shown in fig. 2, assuming that the voltage resistance of the OUT terminal of the constant current chip is 20V, the voltage regulator tube is 5.1V, the highest VPP voltage of 25V passes through the eb junction of QP1 and ZD1, and then the voltage applied to the OUT0 terminal is about 25-0.7-5.1-19.2V, which is lower than the voltage resistance of the OUT terminal of the chip, so that the constant current chip can normally operate.
By using the circuit structure, the cost of the VDD/VPP/GND driving circuit of a general programmer product can be reduced by 50%, the circuit board area of the driving circuit can be reduced by 50%, and the product competitiveness can be greatly enhanced.
Example 2: in addition to embodiment 1, the model of the chip U1 is a constant current driving chip such as ICN2026 or SB 16726.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A low-cost driving circuit of a programmer VPP high-voltage circuit comprises a triode QP1, a triode QC1, a triode QN1, a zener diode ZD1 and a constant-current driving chip U1 and is characterized in that a pin OUT0 of the constant-current driving chip U1 is connected with the anode of a zener diode ZD1, the cathode of the zener diode ZD1 is connected with the base of a triode QP1, the emitter of the triode QP1 is connected with voltage VPP, the collector of the triode QP1 is connected with the collector of a triode QN1, the cathode of a diode D1 and a ZIF locking seat, the anode of a diode D1 is connected with the collector of a triode QC1, the base of the triode QC1 is connected with the VDD constant-current driving chip, the emitter of the triode QC1 is connected with a power supply VDD, and the base of.
2. The low-cost driving circuit of a programmer VPP high-voltage circuit of claim 1, wherein the voltage VPP is up to 25V.
3. The low-cost driving circuit of a programmer VPP high-voltage circuit of claim 1, wherein the voltage VDD is up to 6.5V.
4. The low-cost driving circuit of a programmer VPP high-voltage circuit as claimed in claim 1, wherein the model of the constant current driving chip U1 is ICN2026 or SB 16726.
5. The low-cost driving circuit of a high-voltage circuit of a programmer VPP according to claim 4, wherein the Zener diode ZD1 is Zener diode with voltage withstanding range of 4.7V-8.2V.
6. The low-cost driving circuit of a programmer VPP high-voltage circuit as claimed in claim 4, wherein said transistor QP1 is a PNP transistor.
7. The low-cost driving circuit of a programmer VPP high-voltage circuit as claimed in claim 4, wherein said transistor QC1 is a PNP transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010198191.2A CN111276093B (en) | 2020-03-19 | 2020-03-19 | Low-cost driving circuit of programmer VPP high-voltage circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010198191.2A CN111276093B (en) | 2020-03-19 | 2020-03-19 | Low-cost driving circuit of programmer VPP high-voltage circuit |
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| Publication Number | Publication Date |
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| CN111276093A true CN111276093A (en) | 2020-06-12 |
| CN111276093B CN111276093B (en) | 2024-07-02 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202121822U (en) * | 2011-05-16 | 2012-01-18 | 深圳世强电讯有限公司 | Led constant current drive circuit |
| CN204945730U (en) * | 2015-09-28 | 2016-01-06 | 季春 | A kind of programmable device High-speed I/O and high tension protection circuit |
| CN106558286A (en) * | 2017-02-14 | 2017-04-05 | 江苏利鼎微***有限公司 | A kind of full-color LED display screen digital driving chip |
| CN107068040A (en) * | 2017-02-14 | 2017-08-18 | 江苏利鼎微***有限公司 | A kind of one of small spacing all-colour LED display module 256 scan method |
| CN211181601U (en) * | 2020-03-19 | 2020-08-04 | 季春 | Low-cost drive circuit of programming device VPP high-voltage circuit |
-
2020
- 2020-03-19 CN CN202010198191.2A patent/CN111276093B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202121822U (en) * | 2011-05-16 | 2012-01-18 | 深圳世强电讯有限公司 | Led constant current drive circuit |
| CN204945730U (en) * | 2015-09-28 | 2016-01-06 | 季春 | A kind of programmable device High-speed I/O and high tension protection circuit |
| CN106558286A (en) * | 2017-02-14 | 2017-04-05 | 江苏利鼎微***有限公司 | A kind of full-color LED display screen digital driving chip |
| CN107068040A (en) * | 2017-02-14 | 2017-08-18 | 江苏利鼎微***有限公司 | A kind of one of small spacing all-colour LED display module 256 scan method |
| CN211181601U (en) * | 2020-03-19 | 2020-08-04 | 季春 | Low-cost drive circuit of programming device VPP high-voltage circuit |
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| Publication number | Publication date |
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| CN111276093B (en) | 2024-07-02 |
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