CN110299907A - Mobile unit and high level turn low transition circuit - Google Patents
Mobile unit and high level turn low transition circuit Download PDFInfo
- Publication number
- CN110299907A CN110299907A CN201810255260.1A CN201810255260A CN110299907A CN 110299907 A CN110299907 A CN 110299907A CN 201810255260 A CN201810255260 A CN 201810255260A CN 110299907 A CN110299907 A CN 110299907A
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- Prior art keywords
- differential signal
- high level
- circuit
- electrically connected
- level differential
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/003—Modifications for increasing the reliability for protection
- H03K19/00369—Modifications for compensating variations of temperature, supply voltage or other physical parameters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017545—Coupling arrangements; Impedance matching circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
The present invention relates to vehicle electric field, discloses a kind of mobile unit and high level turns low transition circuit.Conversion circuit includes: high level differential signal first input end；The second input terminal of high level differential signal；First load, it is electrically connected the high level differential signal first input end, between the second input terminal of high level differential signal, being electrically connected between node and ground terminal between the high level differential signal first input end and first load is also electrically connected with the first bleeder circuit, first dividing point of first bleeder circuit is electrically connected by the first coupled capacitor with the first output end of low level differential signal, being electrically connected between node and ground terminal between second input terminal of high level differential signal and first load is also electrically connected with the second bleeder circuit, second dividing point of second bleeder circuit is electrically connected by the second coupled capacitor with low level differential signal second output terminal.
Description
Technical field
The present invention relates to vehicle electric field, discloses a kind of mobile unit and high level turns low transition circuit.
Background technique
In car audio system, high level signal, which refers to, directly to be exported from vehicle-mounted CD player to the letter of vehicle-mounted loudspeaker
Number, and low level be for high level, low level signal cannot directly machine export to vehicle-mounted loudspeaker, need through
Vehicle-mounted loudspeaker can be just directly output to by crossing vehicle power amplifier.Low level can only be received in view of modulus conversion chip (ADC)
Input, needs to access the circuit that high level is converted to low level signal.
Summary of the invention
The first purpose of the embodiment of the present invention is that a kind of mobile unit and high level turn low transition circuit.
In a first aspect, the embodiment of the present invention, which provides a kind of high level, turns low transition circuit, comprising:
High level differential signal first input end,
The second input terminal of high level differential signal,
First load, is electrically connected the high level differential signal first input end, the second input terminal of high level differential signal
Between,
Node and ground terminal are electrically connected between the high level differential signal first input end and first load
Between be also electrically connected with the first bleeder circuit,
First dividing point of first bleeder circuit is exported by the first coupled capacitor and low level differential signal first
End electrical connection,
Node and ground terminal are electrically connected between second input terminal of high level differential signal and first load
Between be also electrically connected with the second bleeder circuit,
Second dividing point of second bleeder circuit is exported by the second coupled capacitor and low level differential signal second
End electrical connection,
Wherein, it is connected electrically in the high level differential signal first input end and the low level differential signal first exports
Circuit between end be connected electrically in second input terminal of high level differential signal and the low level differential signal second is defeated
Circuit between outlet is at symmetric relation.
Optionally, the first filter capacitor is also electrically connected between the dividing point and ground terminal of first bleeder circuit；
It is also electrically connected between the dividing point and ground terminal of second bleeder circuit and the first filter capacitor phase
The second same filter capacitor.
Optionally, is also serially connected between the high level differential signal first input end and first bleeder circuit
One filter inductance；
It is also serially connected between second input terminal of high level differential signal and second bleeder circuit and the second filter
Identical second filter inductance of wave inductance.
Optionally, further includes:
First switch circuit is connected electrically between first output end of low level differential signal and ground terminal, when described
When the level of the first output end of low level differential signal is lower than the level of the ground terminal, the first switch circuit conducting；
Second switch circuit is connected electrically between the low level differential signal second output terminal and ground terminal, when described
When the level of low level differential signal second output terminal is lower than the level of the ground terminal, the second switch circuit conducting.
Optionally, further includes:
Third switching circuit, one end are electrically connected with first output end of low level differential signal, and other end access is predetermined
Voltage, when the level of first output end of low level differential signal is higher than the predetermined voltage, the third switching circuit
Conducting；
4th switching circuit, one end are electrically connected with the low level differential signal second output terminal, described in other end access
Predetermined voltage, when the level of the low level differential signal second output terminal is higher than the predetermined voltage, the 4th switch
Circuit conducting.
Optionally, first bleeder circuit includes: first resistor, second resistance, described first resistor one end with it is described
The electrical connection of high level differential signal first input end, the other end are electrically connected in first dividing point and one end of the second resistance
It connects, the other end of the second resistance is electrically connected with the ground terminal；
Second bleeder circuit include: respectively 3rd resistor identical with the first resistor, second resistance, the 4th electricity
Resistance, described 3rd resistor one end are electrically connected with second input terminal of high level differential signal, and the other end is in second partial pressure
Point is electrically connected with one end of the 4th resistance, and the other end of the 4th resistance is electrically connected with the ground terminal.
Second aspect, the embodiment of the invention provides a kind of mobile units, turn including above-mentioned any high level
Low transition circuit.
Optionally, the mobile unit is vehicle-mounted audio device.
Therefore using circuit shown in FIG. 1, since low level AIN1+, AIN1- is the first bleeder circuit, second point
Obtained by partial pressure of the volt circuit to high level H+, H-, make high level H+, H-, the reference voltage of low level AIN1+, AIN1- is to connect
The problem of ground terminal AGND has unified reference voltage, avoids reference voltage drift avoids since reference voltage offset is led
The problem of distorted signals of cause.
Detailed description of the invention
Fig. 1 is the circuit theory schematic diagram that the high level that the embodiment of the present invention 1 provides turns low transition circuit；
Fig. 2 is the control schematic illustration that a kind of high level that the embodiment of the present invention 1 provides turns low transition circuit.
Specific embodiment
Below in conjunction with attached drawing and specific embodiment, the present invention will be described in detail, herein illustrative examples of the invention
And explanation is used to explain the present invention, but not as a limitation of the invention.
Embodiment 1:
Shown in Figure 1, the application provides a kind of high level and turns low transition circuit, characterized in that includes: high level
Differential signal first input end H1+, the second input terminal of high level differential signal H1-, first load R0, the first bleeder circuit 101,
Second bleeder circuit 102, the first coupled capacitor C3, the second coupled capacitor C4.
Wherein, it is defeated to be connected across high level differential signal first input end H1+, high level differential signal second by the first load R0
Enter to hold between H1-, the input terminal as high level signal VH1+, VH1- loads.
Between one end of first bleeder circuit 101 and high level differential signal first input end H1+ and the first load R0
It is electrically connected node electrical connection, the other end is electrically connected with ground terminal AGND, and the dividing point of the first bleeder circuit 101 (is denoted as first point
Pressure point A1) be electrically connected with the first output terminals A of low level differential signal IN1+ by the first coupled capacitor C3, to input it is high electric
The high-voltage signal H1+ of adjustment sub-signal first input end H1+ input, which is divided, obtains required low electricity in the first dividing point A1
Ordinary telegram pressure is carried out defeated to the first output terminals A of low level differential signal IN1+ after isolation exchange is handled by the first coupled capacitor C3
Low level signal AIN1+ out realizes high level to low level conversion.
Similarly, one end of 102 electricity of the second bleeder circuit and the load of high level differential signal the second input terminal H1- and first R0
Between the electrical connection of electrical connection node, the other end is electrically connected with the ground terminal AGND, the dividing point of the second bleeder circuit 102
(being denoted as the second dividing point A2) is electrically connected by the second coupled capacitor C4 with low level differential signal second output terminal, to input
High level differential signal the second input terminal H1- input high-voltage signal H1- divided and obtained in the second dividing point A2 needed for
Low level voltage, by the second coupled capacitor C4 carry out isolation exchange processing after it is defeated to low level differential signal second output terminal
Low level signal AIN1- out realizes high level to low level conversion.
In foregoing circuit, it is connected electrically in high level differential signal first input end H1+ and low level differential signal first
Circuit between output terminals A IN1+, and is connected electrically in high level differential signal the second input terminal H1- and low level differential signal the
Circuit between two output terminals A IN1- is at symmetric relation (i.e. circuit parameter and connection structure is the same), so that it is guaranteed that high level
To low level lossless conversion, distorted signals is avoided.
A kind of high level that Fig. 2 show for being compareed with the present embodiment turns low-level circuit, electricity shown in Fig. 2
Lu Zhong, the first high level VH1+, the second high level signal VH- reference voltage be resistance Rin mid-point voltage, the first low level
VAIN1+, the second low level signal VAIN1- reference voltage be the mid-point voltage of resistance Rout, and it is worked in actual circuit
The impedance of Cheng Zhong, resistance Rin, resistance Rout can change because resistance temperature changes, and will lead to its midpoint voltage change, i.e.,
Cause the reference voltage of circuit to change, that is, there is circuit reference voltage drift phenomenon, leads to conversion circuit distorted signals.
And circuit shown in FIG. 1 is used, since the first low level VAIN1+, the second low level signal VAIN1- are first point
Obtained by the partial pressure of volt circuit 101, the second bleeder circuit 102 to the first high level VH1+, the second high level signal VH-, make first
The reference voltage of high level VH1+, the second high level signal VH-, the first low level VAIN1+, the second low level signal VAIN1-
The problem of being ground terminal AGNDAGND, have unified reference voltage, avoiding reference voltage drift, avoids due to reference
Caused by variation the problem of distorted signals.
As the present embodiment signal rather than limit, can also be further in first bleeder circuit 101 of the present embodiment
It is also electrically connected the first filter capacitor C1 between first dividing point A1 and ground terminal AGND, is carried out with the voltage to the first dividing point A1
Filtering；
Similarly, as the signal of the present embodiment rather than limit, can also be further in second bleeder circuit of the present embodiment
It is also electrically connected the second filter capacitor C2 between 102 the second dividing point A2 and ground terminal AGND, with the electricity to the second dividing point A2
Pressure is filtered.In the present embodiment, make the first filter capacitor C1, the second filter capacitor C2 identical, so that it is guaranteed that the first low electricity
The balance of ordinary mail VAIN1+, the second low level signal VAIN1-, avoid distorted signals caused by level conversion.
It is shown in Figure 1, as the present embodiment signal rather than limit, can also be further at first point of the present embodiment
First dividing point A1 of volt circuit 101 and the first bleeder circuit 101 are electrically connected with high level differential signal first input end H1+'s
The first filter inductance L1 is concatenated between end, to be input to the after carrying out High frequency filter to the first high level voltage H1+ of input
One bleeder circuit 101；In the second dividing point A2 of second bleeder circuit 102 of the present embodiment and the second bleeder circuit 102 and height
The second filter inductance L2 is concatenated between the electrical connection end of the second input terminal of level differential signal H1-, it is high with second to input
Level voltage H1- is input to the second bleeder circuit 102 after carrying out High frequency filter, improves the High-frequency Interference rejection ability of circuit.Its
In the first filter inductance L1, the parameter of the second filter inductance L2 it is consistent, so that it is guaranteed that the first low level signal VAIN1+, second low
The balance of level signal VAIN1- avoids distorted signals caused by level conversion.
It is shown in Figure 1, as the present embodiment signal rather than limit, can also be exported in low level differential signal first
It is electrically connected first switch circuit between the end end AIN1+ and ground terminal AGND, is made as the first output terminals A of low level differential signal IN1+
Level when being lower than the level of ground terminal AGND, the conducting of first switch circuit, the signal that will be less than ground terminal AGND bypasses to ground.
Similarly, second switch can also be electrically connected between low level differential signal second output terminal end and ground terminal AGND
Circuit makes when the level of low level differential signal second output terminal is lower than the level of ground terminal AGND, and second switch circuit is led
Logical, the signal that will be less than ground terminal AGND is bypassed to ground.
As the signal of the present embodiment, the first switch circuit, second switch circuit be can be, but not limited to using switch two
Pole pipe D1, D2 is realized, connect the anode of diode D1, D2 with ground terminal AGND respectively, and cathode is believed with low level difference respectively
Number the first output terminals A IN1+, the electrical connection of low level differential signal second output terminal.
It is shown in Figure 1, as the present embodiment signal rather than limit, can also be further in low level differential signal the
One end output terminals A IN1+ connects third switching circuit, and accessing predetermined voltage in the other end of third switch, (Fig. 2 is to access+5V electricity
Pressure is signal) make when the level of the first output terminals A of low level differential signal IN1+ is higher than predetermined voltage, third switching circuit is led
It is logical, which is passed through into the bypass output of third switching circuit.
Similarly, one end electricity of the 4th switching circuit can also further be connected at low level differential signal second output terminal end
Connection makes to work as low level differential signal in the other end access predetermined voltage (Fig. 2 is to access+5V voltage as signal) of the 4th switch
When the level of second output terminal is higher than predetermined voltage, this is higher than signal of predetermined voltage by the by the conducting of the 4th switching circuit
The bypass output of four switching circuits.
As the present embodiment signal rather than limit, the first switch circuit, second switch circuit can be, but not limited to adopt
Realized with switching diode D3, D4, make the anode of diode D3, D4 respectively with the first output terminals A of low level differential signal IN1+,
The electrical connection of low level differential signal second output terminal, cathode are respectively connected to predetermined voltage.
As the present embodiment signal rather than limit, can be connected at the first output terminals A of low level differential signal IN1+
One limiter BAV99 realizes first switch circuit, third switching circuit, and one is connected at low level differential signal second output terminal
Limiter BAV99 realizes second switch circuit, the 4th switching circuit.
In addition, shown in Figure 1, as the present embodiment signal rather than limit, first bleeder circuit 101 of the present embodiment
It include: first resistor R1, second resistance R2, the one end first resistor R1 is electrically connected with high level differential signal first input end H1+,
The other end is electrically connected in the first dividing point A1 with one end of second resistance R2, the other end of second resistance R2 and the ground terminal
AGND electrical connection；
Second bleeder circuit 102 includes: 3rd resistor R3 identical with first resistor R1, second resistance R2, the 4th respectively
Resistance R4, the one end 3rd resistor R3 are electrically connected with the second input terminal of high level differential signal H1-, and the other end is in the second dividing point A2
It is electrically connected with one end of the 4th resistance R4, the other end of the 4th resistance R4 is electrically connected with the ground terminal AGND.
For the present embodiment technical solution especially suitable for mobile unit, being such as but not limited to for example will for vehicle-mounted audio device
From vehicle-mounted audio device from CD player export signal can be directly output to vehicle-mounted loudspeaker, level with higher and cannot
It is directly inputted into analog to digital conversion circuit, and low transition circuit is turned using the present embodiment high level, it can be to high level signal
It is lossless be converted to low level signal after be input to analog to digital conversion circuit again, with to audio signal carry out digitized signal processing.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (8)
1. a kind of high level turns low transition circuit, characterized in that include:
High level differential signal first input end；
The second input terminal of high level differential signal；
First load, is electrically connected between the high level differential signal first input end, the second input terminal of high level differential signal；
First bleeder circuit is connected electrically in being electrically connected between the high level differential signal first input end and first load
It connects between node and ground terminal, the first dividing point of first bleeder circuit is believed by the first coupled capacitor and low level difference
The electrical connection of number the first output end；
Second bleeder circuit is connected electrically in being electrically connected between second input terminal of high level differential signal and first load
It connects between node and ground terminal, the second dividing point of second bleeder circuit is believed by the second coupled capacitor and low level difference
The electrical connection of number second output terminal；
Wherein, be connected electrically in the high level differential signal first input end and first output end of low level differential signal it
Between circuit and be connected electrically in second input terminal of high level differential signal and the low level differential signal second output terminal
Between circuit at symmetric relation.
2. high level according to claim 1 turns low transition circuit, characterized in that
The first filter capacitor is also electrically connected between the dividing point and ground terminal of first bleeder circuit；
It is also electrically connected between the dividing point and ground terminal of second bleeder circuit identical with first filter capacitor
Second filter capacitor.
3. high level according to claim 1 turns low transition circuit, characterized in that
The first filter inductance is also serially connected between the high level differential signal first input end and first bleeder circuit；
It is also serially connected with and the second filtered electrical between second input terminal of high level differential signal and second bleeder circuit
Identical second filter inductance of sense.
4. high level according to claim 1 turns low transition circuit, characterized in that further include:
First switch circuit is connected electrically between first output end of low level differential signal and ground terminal, when the low electricity
When the level of the first output end of adjustment sub-signal is lower than the level of the ground terminal, the first switch circuit conducting；
Second switch circuit is connected electrically between the low level differential signal second output terminal and ground terminal, when the low electricity
When the level of adjustment sub-signal second output terminal is lower than the level of the ground terminal, the second switch circuit conducting.
5. high level according to claim 1 turns low transition circuit, characterized in that further include:
Third switching circuit, one end are electrically connected with first output end of low level differential signal, and the other end accesses predetermined voltage,
When the level of first output end of low level differential signal is higher than the predetermined voltage, the third switching circuit conducting；
4th switching circuit, one end are electrically connected with the low level differential signal second output terminal, and other end access is described predetermined
Voltage, when the level of the low level differential signal second output terminal is higher than the predetermined voltage, the 4th switching circuit
Conducting.
6. high level according to claim 1 turns low transition circuit, characterized in that
First bleeder circuit includes: first resistor, second resistance, and described first resistor one end and the high level difference are believed
The electrical connection of number first input end, the other end are electrically connected in first dividing point with one end of the second resistance, and described second
The other end of resistance is electrically connected with the ground terminal；
Second bleeder circuit includes: 3rd resistor identical with the first resistor, second resistance, the 4th resistance respectively,
Described 3rd resistor one end is electrically connected with second input terminal of high level differential signal, the other end second dividing point with
One end of 4th resistance is electrically connected, and the other end of the 4th resistance is electrically connected with the ground terminal.
7. a kind of mobile unit, characterized in that any high level including claim 1 to 7 turns low transition electricity
Road.
8. a kind of mobile unit according to claim 7, characterized in that the mobile unit is vehicle-mounted audio device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810255260.1A CN110299907A (en) | 2018-03-23 | 2018-03-23 | Mobile unit and high level turn low transition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810255260.1A CN110299907A (en) | 2018-03-23 | 2018-03-23 | Mobile unit and high level turn low transition circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110299907A true CN110299907A (en) | 2019-10-01 |
Family
ID=68026241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810255260.1A Pending CN110299907A (en) | 2018-03-23 | 2018-03-23 | Mobile unit and high level turn low transition circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110299907A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112051463A (en) * | 2020-08-07 | 2020-12-08 | 广州亚美智造科技有限公司 | Vehicle-mounted diagnosis system plug detection circuit and vehicle management system |
-
2018
- 2018-03-23 CN CN201810255260.1A patent/CN110299907A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112051463A (en) * | 2020-08-07 | 2020-12-08 | 广州亚美智造科技有限公司 | Vehicle-mounted diagnosis system plug detection circuit and vehicle management system |
| CN112051463B (en) * | 2020-08-07 | 2023-08-11 | 亚美智联数据科技有限公司 | Plug detection circuit of vehicle-mounted diagnosis system and vehicle management system |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20191001 |
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| WD01 | Invention patent application deemed withdrawn after publication |