CN202150795U - Simulation screen and voltage conversion circuit thereof - Google Patents
Simulation screen and voltage conversion circuit thereof Download PDFInfo
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- CN202150795U CN202150795U CN201120248040U CN201120248040U CN202150795U CN 202150795 U CN202150795 U CN 202150795U CN 201120248040 U CN201120248040 U CN 201120248040U CN 201120248040 U CN201120248040 U CN 201120248040U CN 202150795 U CN202150795 U CN 202150795U
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Abstract
The utility model discloses a simulation screen and a voltage conversion circuit thereof. In the voltage conversion circuit, an output end of a PWM wave generation chip is respectively connected with a cathode of a first diode and an anode of a second diode via a first capacitor, an anode of the first diode is connected with an output end of a dc source, a cathode of the second diode is grounded via a second capacitor, a first end of a first resistor is connected with the cathode of the second diode, a second end of the first resistor serves as an output end of a positive bias voltage conversion unit, a second resistor is connected between the positive bias voltage conversion unit and the ground, an anode of a first energy storage capacitor is connected with the output end of the positive bias voltage conversion unit, a cathode of the first energy storage capacitor is grounded, a cathode of a first voltage stabilizing diode is connected with the output end of the positive bias voltage conversion unit, and an anode of the first voltage stabilizing diode is grounded. By the voltage conversion circuit, voltage needed for the simulation circuit can be obtained with no boost DC-DC chip adopted, so cost of the voltage conversion circuit is low.
Description
Technical field
The utility model relates to voltage transitions, relates in particular to a kind of imitation screen and voltage conversion circuit thereof.
Background technology
In existing small size imitation screen, adopt the chip of DC-DC to convert supply voltage to this imitation screen needed voltage usually, for example, the positive bias voltage of 15V.Yet owing to need to adopt the boost DC-DC chip, therefore the cost of this voltage conversion circuit is higher.
The utility model content
The technical problem that the utility model will solve is, to the above-mentioned voltage conversion circuit defect of high cost of prior art, the voltage conversion circuit of the low imitation screen of a kind of cost is provided.
The utility model solves the technical scheme that its technical problem adopted: construct a kind of voltage conversion circuit; Be connected in the PWM ripple and produce chip and DC power supply; Said voltage conversion circuit comprises the positive bias voltage converting unit, and said positive bias voltage converting unit comprises first electric capacity, first diode, second diode, second electric capacity, first resistance, second resistance, first storage capacitor and first voltage stabilizing didoe, wherein; The output that the PWM ripple produces chip connects the negative pole of first diode and the positive pole of second diode respectively through first electric capacity; The positive pole of first diode connects the output of DC power supply, and the negative pole of second diode is through second capacity earth, and first end of first resistance connects the negative pole of second diode; Second end of first resistance is the output of positive bias voltage converting unit; Second resistance is connected between the output and ground of positive bias voltage converting unit, and the positive pole of first storage capacitor connects the output of positive bias voltage converting unit, the minus earth of first storage capacitor; The negative pole of first voltage stabilizing didoe connects the output of positive bias voltage converting unit, the plus earth of first voltage stabilizing didoe.
In the described voltage conversion circuit of the utility model; Said voltage conversion circuit also comprises the negative bias voltage converting unit; Said negative bias voltage converting unit comprises the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 3rd diode, the 4th diode, the 5th diode, the 6th diode, the 3rd resistance, the 4th resistance, second storage capacitor and second voltage stabilizing didoe; Wherein, first end of the 3rd electric capacity connects the output that the PWM ripple produces chip, and second end of the 3rd electric capacity connects the positive pole of the 3rd diode and the negative pole of the 4th diode respectively; The minus earth of the 3rd diode, the positive pole of the 4th diode is through five capacity earths; First end of the 4th electric capacity connects the output that the PWM ripple produces chip; Second end of the 4th electric capacity connects the positive pole of the 5th diode and the negative pole of the 6th diode respectively; The negative pole of the 5th diode connects the positive pole of the 4th diode, and the positive pole of the 6th diode is through the 6th capacity earth, the positive pole of first termination the 6th diode of the 3rd resistance; Second end of the 3rd resistance is the output of negative bias voltage converting unit; The 4th resistance is connected between the output and ground of negative bias voltage converting unit, and the negative pole of second storage capacitor connects the output of negative bias voltage converting unit, the plus earth of second storage capacitor; The positive pole of second voltage stabilizing didoe connects the output of negative bias voltage converting unit, the minus earth of second voltage stabilizing didoe.
In the described voltage conversion circuit of the utility model; Said voltage conversion circuit also comprises voltage conversion unit backlight; Said voltage conversion unit backlight comprises the 7th diode, the 8th diode, the 3rd voltage stabilizing didoe and the 3rd storage capacitor, and wherein, the positive pole of the positive pole of the 7th diode and the 8th diode connects the output that the PWM ripple produces chip respectively; The negative pole of the negative pole of the 7th diode and the 8th diode connects the negative pole of the 3rd voltage stabilizing didoe respectively; The plus earth of the 3rd voltage stabilizing didoe, the output of the voltage conversion unit just very backlight of the 3rd storage capacitor, the minus earth of the 3rd storage capacitor.
In the described voltage conversion circuit of the utility model, the output of said DC power supply is the output of voltage conversion unit backlight.
The utility model is also constructed a kind of imitation screen, comprises that the PWM ripple produces chip and voltage conversion circuit, and said voltage conversion circuit is above-described voltage conversion circuit.
Implement the technical scheme of the utility model, need not to adopt the boost DC-DC chip promptly to obtain the needed voltage of imitation screen, therefore the cost of this voltage conversion circuit is lower.
Description of drawings
To combine accompanying drawing and embodiment that the utility model is described further below, in the accompanying drawing:
Fig. 1 is the circuit diagram of the utility model voltage conversion circuit embodiment one;
Fig. 2 is the circuit diagram of the utility model voltage conversion circuit embodiment two;
Fig. 3 is the circuit diagram of the utility model voltage conversion circuit embodiment three.
Embodiment
As shown in Figure 1; In the circuit diagram of the utility model voltage conversion circuit embodiment one; This voltage conversion circuit is connected in the PWM ripple and produces chip and DC power supply; Said voltage conversion circuit comprises the positive bias voltage converting unit, and said positive bias voltage converting unit comprises first capacitor C 109, the first diode D251, the second diode D252, second capacitor C 112, first resistance R 134, second resistance R 155, the first storage capacitor EC23 and the first voltage stabilizing didoe D28, wherein; The output that the PWM ripple produces chip connects the negative pole of the first diode D251 and the positive pole of the second diode D252 respectively through first capacitor C 109; The positive pole of the first diode D251 connects the output of DC power supply, and the negative pole of the second diode D252 is through second capacitor C, 112 ground connection, and first end of first resistance R 134 connects the negative pole of the second diode D252; Second end of first resistance R 134 is the output of positive bias voltage converting unit; Second resistance R 155 is connected between the output and ground of positive bias voltage converting unit, and the positive pole of the first storage capacitor EC23 connects the output of positive bias voltage converting unit, the minus earth of the first storage capacitor EC23; The negative pole of the first voltage stabilizing didoe D28 connects the output of positive bias voltage converting unit, the plus earth of the first voltage stabilizing didoe D28.
The operation principle of the positive bias voltage converting unit of this voltage conversion circuit is described below.Suppose that VLC is the output of DC power supply, its output dc voltage U1, VSW2 produce the output of chip for the PWM ripple; The PWM square wave that its output cycle is T; And suppose the peak value Vp-p=9V of this PWM square wave, high level and low level ratio are 4:1, promptly in one-period T; In the time of 4/5T, VSW2=9V; In the time of 1/5T, VSW2=0V then puts the voltage U 3=VSW2+U1 (not having pressure drop when supposing diode current flow) at 3 places, promptly in one-period T, and in the time of 4/5T, U3=9V+U1; In the time of 1/5T, U3=U1.Because the second diode D252 forward conduction, so, in the time of 4/5T, put the voltage U 2=9V+U1 at 2 places; In the time of 1/5T, since the energy storage of the rear end first storage capacitor EC23, the voltage U 2=9V+U1 of point 2.At this moment, U3=U1, the second diode D252 cathode voltage is higher than cathode voltage, the therefore second not conducting of diode D252.Therefore, U2=9V+U1 under the perfect condition.In the side circuit of imitation screen, if U1=10V, VSW2 is that frequency f=1.3MHz, peak value are the square wave of Vp-p 12V.Under perfect condition, the voltage VGH=12V+10V=22V that the output of positive bias voltage converting unit is exported.But, consider the conduction voltage drop of the first diode D251, the second diode D252, the carrying load ability and the components and parts energy loss at point 2 places, test records the voltage VGH=15V that the output of positive bias voltage converting unit is exported.
In the embodiment two of the utility model; This voltage conversion circuit is except that comprising positive bias voltage converting unit shown in Figure 1; Also comprise the negative bias voltage converting unit; As shown in Figure 2; This negative bias voltage converting unit comprises the 3rd capacitor C 110, the 4th capacitor C 111, the 5th capacitor C 115, the 6th capacitor C 114, the 3rd diode D261, the 4th diode D262, the 5th diode D271, the 6th diode D272, the 3rd resistance R 135, the 4th resistance R 156, the second storage capacitor EC24 and the second voltage stabilizing didoe D29; Wherein, first end of the 3rd capacitor C 110 connects the output that the PWM ripple produces chip, and second end of the 3rd capacitor C 110 connects the positive pole of the 3rd diode D261 and the negative pole of the 4th diode D262 respectively; The minus earth of the 3rd diode D261, the positive pole of the 4th diode D262 is through five capacitor C, 115 ground connection; First end of the 4th capacitor C 111 connects the output that the PWM ripple produces chip; Second end of the 4th capacitor C 111 connects the positive pole of the 5th diode D271 and the negative pole of the 6th diode D272 respectively; The negative pole of the 5th diode D271 connects the positive pole of the 4th diode D262; The positive pole of the 6th diode D272 is through the 6th capacitor C 114 ground connection; The positive pole of first termination the 6th diode D272 of the 3rd resistance R 135, second end of the 3rd resistance R 135 is the output of negative bias voltage converting unit, the 4th resistance R 156 is connected between the output and ground of negative bias voltage converting unit; The negative pole of the second storage capacitor EC24 connects the output of negative bias voltage converting unit; The plus earth of the second storage capacitor EC24, the positive pole of the second voltage stabilizing didoe D29 connects the output of negative bias voltage converting unit, the minus earth of the second voltage stabilizing didoe D29.
The operation principle of the negative bias voltage converting unit of this voltage conversion circuit is described below.Suppose that VSW2 produces the output of chip for the PWM ripple, the PWM square wave that its output cycle is T, and suppose the peak value Vp-p=9V of this PWM square wave, high level and low level ratio are 4:1, promptly in one-period T, in the time of 4/5T, VSW2=9V; In the time of 1/5T, VSW2=0V, in addition, the voltage at some a, b, c, d, e, f place is respectively Ua, Ub, Uc, Ud, Ue, Uf.Suppose that the 3rd diode D261 is an ideal model, conducting does not have pressure drop, and then owing to the effect at a distance from straight-through friendship of the 3rd capacitor C 110, Ua is the center for should be 0V, and the cycle is the square wave of T, Vp-p=9V.If Ua>Ub, then the 3rd diode D261 conducting, a holds ground connection, so the voltage of Ua is to be the square wave of T in the cycle, and peak voltage is 0V, peak value Vp-p=9V, promptly in cycle T, in the time of 4/5T, Ua=0V; In the time of 1/5T, Ua=-9V.If do not have the 5th diode D271, the 6th diode D272 and the 5th capacitor C 115, then Uc=Ua.Now because the existence of the 5th capacitor C 115, Uc can not undergo mutation, and Uc must be less than or equal to Ua, and then Uc is that the minimum value among the Ua is Uc=-9V.In like manner, Ue is that the cycle is the square wave of T, supposes Vp-p=9V, and high level and low level ratio are 4:1; Promptly in cycle T, in the time of 4/5T, Ue=-9V, 1/5T; Ue=-18V, Uf=-18V, i.e. the voltage VGL=-18V that exports of the output of negative bias voltage converting unit.In the side circuit of imitation screen, the frequency f of VSW2=1.3MHz square wave, peak value Vp-p=12V, under the perfect condition, the voltage VGL=-22V that the output of negative bias voltage converting unit is exported.Consider third and fourth, five, six diode D261, D262, D271, the conduction voltage drop of D272, carrying load ability and the components and parts energy loss of Uf, the voltage VGL=-10V that the output of negative bias voltage converting unit is exported.
In the 3rd embodiment; This voltage conversion circuit is except that comprising positive bias voltage converting unit shown in Figure 1 and/or negative bias voltage converting unit shown in Figure 2; Also comprise voltage conversion unit backlight, as shown in Figure 3, this voltage conversion unit backlight comprises the 7th diode D231, the 8th diode D232, the 3rd voltage stabilizing didoe D24 and the 3rd storage capacitor EC22; Wherein, The positive pole of the positive pole of the 7th diode D231 and the 8th diode D232 connects the output that the PWM ripple produces chip respectively, and the negative pole of the negative pole of the 7th diode D231 and the 8th diode D232 connects the negative pole of the 3rd voltage stabilizing didoe D24, the plus earth of the 3rd voltage stabilizing didoe D24 respectively; The output of the voltage conversion unit just very backlight of the 3rd storage capacitor EC22, the minus earth of the 3rd storage capacitor EC22.
The operation principle of the voltage conversion unit backlight of this voltage conversion circuit is described below.If V50=5V; Then output output frequency f=1.3MHz, the cycle of PWM ripple generation chip U16 are that T, peak value Vp-p are the PWM square wave of 12V; After the 7th diode D231, the 8th diode D232 rectification, the output output dc voltage VLC=10V of voltage conversion unit backlight.
Preferably, also available this backlight electric power converting unit of the DC power supply that in the positive bias voltage converting unit, is to use replaces, and promptly the output of DC power supply is the output of voltage conversion unit backlight.
The utility model is also constructed a kind of imitation screen, comprises that the PWM ripple produces chip and voltage conversion circuit, and this voltage conversion circuit can be the voltage conversion circuit among above-mentioned arbitrary embodiment.
The preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the utility model.
Claims (5)
1. voltage conversion circuit; Be connected in the PWM ripple and produce chip and DC power supply; It is characterized in that; Said voltage conversion circuit comprises the positive bias voltage converting unit; Said positive bias voltage converting unit comprises first electric capacity (C109), first diode (D251), second diode (D252), second electric capacity (C112), first resistance (R134), second resistance (R155), first storage capacitor (EC23) and first voltage stabilizing didoe (D28); Wherein, the output that the PWM ripple produces chip connects the negative pole of first diode (D251) and the positive pole of second diode (D252) respectively through first electric capacity (C109), and the positive pole of first diode (D251) connects the output of DC power supply; The negative pole of second diode (D252) is through second electric capacity (C112) ground connection; First end of first resistance (R134) connects the negative pole of second diode (D252), and second end of first resistance (R134) is the output of positive bias voltage converting unit, and second resistance (R155) is connected between the output and ground of positive bias voltage converting unit; The positive pole of first storage capacitor (EC23) connects the output of positive bias voltage converting unit; The minus earth of first storage capacitor (EC23), the negative pole of first voltage stabilizing didoe (D28) connects the output of positive bias voltage converting unit, the plus earth of first voltage stabilizing didoe (D28).
2. voltage conversion circuit according to claim 1; It is characterized in that; Said voltage conversion circuit also comprises the negative bias voltage converting unit; Said negative bias voltage converting unit comprises the 3rd electric capacity (C110), the 4th electric capacity (C111), the 5th electric capacity (C115), the 6th electric capacity (C114), the 3rd diode (D261), the 4th diode (D262), the 5th diode (D271), the 6th diode (D272), the 3rd resistance (R135), the 4th resistance (R156), second storage capacitor (EC24) and second voltage stabilizing didoe (D29); Wherein, First end of the 3rd electric capacity (C110) connects the output that the PWM ripple produces chip; Second end of the 3rd electric capacity (C110) connects the positive pole of the 3rd diode (D261) and the negative pole of the 4th diode (D262) respectively, the minus earth of the 3rd diode (D261), and the positive pole of the 4th diode (D262) is through five electric capacity (C115) ground connection; First end of the 4th electric capacity (C111) connects the output that the PWM ripple produces chip; Second end of the 4th electric capacity (C111) connects the positive pole of the 5th diode (D271) and the negative pole of the 6th diode (D272) respectively; The negative pole of the 5th diode (D271) connects the positive pole of the 4th diode (D262); The positive pole of the 6th diode (D272) is through the 6th electric capacity (C114) ground connection; The positive pole of first termination the 6th diode (D272) of the 3rd resistance (R135), second end of the 3rd resistance (R135) is the output of negative bias voltage converting unit, the 4th resistance (R156) is connected between the output and ground of negative bias voltage converting unit; The negative pole of second storage capacitor (EC24) connects the output of negative bias voltage converting unit; The plus earth of second storage capacitor (EC24), the positive pole of second voltage stabilizing didoe (D29) connects the output of negative bias voltage converting unit, the minus earth of second voltage stabilizing didoe (D29).
3. voltage conversion circuit according to claim 1; It is characterized in that; Said voltage conversion circuit also comprises voltage conversion unit backlight; Said voltage conversion unit backlight comprises the 7th diode (D231), the 8th diode (D232), the 3rd voltage stabilizing didoe (D24) and the 3rd storage capacitor (EC22), and wherein, the positive pole of the positive pole of the 7th diode (D231) and the 8th diode (D232) connects the output that the PWM ripple produces chip respectively; The negative pole of the negative pole of the 7th diode (D231) and the 8th diode (D232) connects the negative pole of the 3rd voltage stabilizing didoe (D24) respectively; The plus earth of the 3rd voltage stabilizing didoe (D24), the output of the voltage conversion unit just very backlight of the 3rd storage capacitor (EC22), the minus earth of the 3rd storage capacitor (EC22).
4. voltage conversion circuit according to claim 3 is characterized in that, the output of said DC power supply is the output of voltage conversion unit backlight.
5. an imitation screen is characterized in that, comprises that the PWM ripple produces chip and voltage conversion circuit, and said voltage conversion circuit is each described voltage conversion circuit of claim 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120248040U CN202150795U (en) | 2011-07-14 | 2011-07-14 | Simulation screen and voltage conversion circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120248040U CN202150795U (en) | 2011-07-14 | 2011-07-14 | Simulation screen and voltage conversion circuit thereof |
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| CN202150795U true CN202150795U (en) | 2012-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120248040U Expired - Fee Related CN202150795U (en) | 2011-07-14 | 2011-07-14 | Simulation screen and voltage conversion circuit thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946190A (en) * | 2012-10-23 | 2013-02-27 | 深圳市新国都技术股份有限公司 | Positive and negative voltage generating circuit |
| CN104883050A (en) * | 2015-05-22 | 2015-09-02 | 广东好帮手电子科技股份有限公司 | Vehicle navigation step-up and step-down device |
| CN110718959A (en) * | 2018-07-13 | 2020-01-21 | 圣邦微电子（北京）股份有限公司 | Standby power supply system |
-
2011
- 2011-07-14 CN CN201120248040U patent/CN202150795U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102946190A (en) * | 2012-10-23 | 2013-02-27 | 深圳市新国都技术股份有限公司 | Positive and negative voltage generating circuit |
| CN104883050A (en) * | 2015-05-22 | 2015-09-02 | 广东好帮手电子科技股份有限公司 | Vehicle navigation step-up and step-down device |
| CN104883050B (en) * | 2015-05-22 | 2018-01-23 | 广东好帮手电子科技股份有限公司 | A kind of vehicle mounted guidance descending device |
| CN110718959A (en) * | 2018-07-13 | 2020-01-21 | 圣邦微电子（北京）股份有限公司 | Standby power supply system |
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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: 20120222 Termination date: 20160714 |
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| CF01 | Termination of patent right due to non-payment of annual fee |