CN203337724U - H half-bridge IPM module bus voltage detection circuit - Google Patents
H half-bridge IPM module bus voltage detection circuit Download PDFInfo
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- CN203337724U CN203337724U CN2013203349462U CN201320334946U CN203337724U CN 203337724 U CN203337724 U CN 203337724U CN 2013203349462 U CN2013203349462 U CN 2013203349462U CN 201320334946 U CN201320334946 U CN 201320334946U CN 203337724 U CN203337724 U CN 203337724U
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Abstract
The utility model discloses a H half-bridge IPM module bus voltage detection circuit comprising the following circuits: a differential input circuit with an input end connected with H half-bridge IPM module bus voltage positive and negative output ends; an impedance inversion circuit with an input end connected with an output end of the differential input circuit; an A/D conversion circuit with an input end connected with an output end of the impedance inversion circuit, the A/D conversion circuit is used for carrying out analog-to-digital conversion for input signals; an optical coupler isolation high speed transmission circuit with an input end connected with an output end of the A/D conversion circuit. The H half-bridge IPM module bus voltage detection circuit employs the differential measuring mode to directly measure the bus voltage, solves the common mode interference and resistance temperature drift problems; the circuit is simple in circuit and low in cost; furthermore, the detection circuit is provided with the optical coupler isolation high speed transmission circuit, and can realize electrical isolation and long distance transmission.
Description
Technical field
The utility model relates to a kind of voltage detecting circuit, especially a kind of H half-bridge IPM module busbar voltage detecting circuit of fan converter.
Background technology
In fan converter when work,, need the busbar voltage of real-time monitor power modules (IPM), could be gained merit to system, idle control.In the bus voltage measurement process of power model (IPM), need to solve the problems such as common mode interference, long-distance transmissions, electrical isolation, just can make the busbar voltage of accurate, the reliable detection power module (IPM) of master control system.
The bus voltage measurement major way of power model (IPM) is at present: 1, adopt the voltage Hall directly to measure; 2, adopt divider resistance indirectly to measure, use the resistance in series dividing potential drop, measure the voltage on divider resistance.Adopt the scheme of voltage Hall for the first, its shortcoming is that price is high, signal delay is large; The scheme that adopts divider resistance indirectly to measure for the second, its shortcoming be vulnerable to common mode interference, the high time error of temperature is large, reliability is not high.
The utility model content
For solving the problems of the technologies described above, the purpose of this utility model is to provide a kind of H half-bridge IPM module busbar voltage detecting circuit.
The technical solution adopted in the utility model is: a kind of H half-bridge IPM module busbar voltage detecting circuit comprises:
Differential input circuit, its positive and negative input end is connected with the positive and negative output terminal of H half-bridge IPM module busbar voltage;
Impedance inverter circuit, its input end is connected with the Differential input circuit output terminal;
The A/D change-over circuit, its input end is connected with the impedance inverter circuit output terminal, for input signal is carried out to analog to digital conversion;
The light-coupled isolation high speed transmission circuit, its input end is connected with A/D change-over circuit output terminal.
Described Differential input circuit comprises: by the first differential amplifier of outside direct current supply; Be separately positioned on the first resistance, the second resistance between the positive and negative input end of the H half-bridge IPM positive and negative output terminal of module busbar voltage and the first differential amplifier; Be arranged between the positive input terminal of the first differential amplifier and ground and and the 3rd resistance and first electric capacity of ining succession; Be arranged on the negative input end of the first differential amplifier and the 4th resistance between output terminal; Wherein, the output terminal that the output terminal of described the first differential amplifier is described Differential input circuit.
Described Differential input circuit also is provided with the diode clamp holding circuit, and described diode clamp holding circuit comprises equal the first diode and the second diode, the 3rd diode and the 4th diode; The negative pole of described the first diode and the second diode is connected and connects the power supply positive input, and the positive pole of the first diode and the second diode is the positive and negative input end of the first differential amplifier respectively; The positive pole of described the 3rd diode and the 4th diode is connected and connects the power-input, and the negative pole of the 3rd diode and the 4th diode is connected respectively the positive and negative input end of the first differential amplifier.
Described impedance inverter circuit comprises the second differential amplifier, the positive input terminal of described the second differential amplifier is connected with described Differential input circuit output terminal, the negative input end of described the second differential amplifier is connected with its output terminal, the output terminal that the output terminal of described the second differential amplifier is described impedance inverter circuit.
The model of described the first differential amplifier and the second differential amplifier is TL082.
Be parallel with the 5th resistance and TVS pipe between described impedance inverter circuit output terminal and ground, the plus earth of described TVS pipe.
Described A/D change-over circuit is the AD conversion chip, and its model is MAX1241.
Described light-coupled isolation high speed transmission circuit comprises clock photoelectric coupled circuit, control photoelectric coupled circuit, the Voltage-output photoelectric coupled circuit be connected with A/D change-over circuit output terminal.
The beneficial effects of the utility model: the utility model testing circuit adopts the difference measurement mode, directly measures busbar voltage, has solved common mode interference and the resistance temperature is floated problem, and circuit is simple, cost is low; In addition, the utility model testing circuit is provided with the light-coupled isolation high speed transmission circuit, can realize electrical isolation and long-distance transmissions.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.
Fig. 1 is the theory diagram of the utility model H half-bridge IPM module busbar voltage detecting circuit;
Fig. 2 is the circuit diagram of Differential input circuit;
Fig. 3 is the circuit diagram of impedance inverter circuit;
Fig. 4 is the circuit diagram of A/D change-over circuit;
Fig. 5 is the circuit diagram of light-coupled isolation high speed transmission circuit.
Embodiment
As shown in Figure 1, a kind of H half-bridge IPM module busbar voltage detecting circuit comprises:
A/D change-over circuit 3, its input end is connected with impedance inverter circuit 2 output terminals, for input signal is carried out to analog to digital conversion;
Light-coupled isolation high speed transmission circuit 4, its input end is connected with A/D change-over circuit 3 output terminals.
With reference to figure 2, Differential input circuit 1 of the present utility model comprises: by the first differential amplifier U1B of outside direct current ± 15V power supply; Be separately positioned on the first resistance R 1, the second resistance R 2 between the positive and negative input end of the H half-bridge IPM positive and negative output terminal of module busbar voltage and the first differential amplifier U1B; Be arranged between the positive input terminal of the first differential amplifier U1B and ground and and the 3rd resistance R 3 and first capacitor C 1 of ining succession; Be arranged on the negative input end of the first differential amplifier U1B and the 4th resistance R 4 between output terminal; Wherein, the output terminal that the output terminal of described the first differential amplifier U1B is described Differential input circuit 1.
In addition, Differential input circuit 1 also is provided with diode clamp holding circuit 5, and described diode clamp holding circuit 5 comprises equal the first diode D1 and the second diode D2, the 3rd diode D3 and the 4th diode D4; The negative pole of the first diode D1 and the second diode D2 is connected and meets power supply positive input+15V, and the positive pole of the first diode D1 and the second diode D2 is the positive and negative input end of the first differential amplifier U1B respectively; The positive pole of described the 3rd diode D3 and the 4th diode D4 is connected and meets power-input-15V, and the negative pole of the 3rd diode D3 and the 4th diode D4 is connected respectively the positive and negative input end of the first differential amplifier U1B.
Figure 3 shows that impedance inverter circuit 2 of the present utility model comprises the second differential amplifier U1A, the positive input terminal of the second differential amplifier U1A is connected with described Differential input circuit 1 output terminal, the negative input end of the second differential amplifier U1A is connected with its output terminal, the output terminal that the output terminal of described the second differential amplifier U1A is described impedance inverter circuit 2.
Wherein, the model of above-mentioned the first differential amplifier U1B and the second differential amplifier U1A is TL082.
For preventing impacting with high pressure, be parallel with the 5th resistance R 5 and TVS pipe TVS1 between impedance inverter circuit 2 output terminals and ground, the plus earth of TVS pipe TVS1.
As shown in Figure 4, A/D change-over circuit 3 is AD conversion chip U2, its model is MAX1241, and it comprises: the first port VDD be connected with DC5v, the second port AIN, the 4th port REF and the 3rd port SHDN be connected with the output terminal of impedance inverter circuit 2, five-port GND, the 6th port DOUT of ground connection, the 7th port CS, the 8th port SCLK.
As shown in Figure 5, light-coupled isolation high speed transmission circuit 4 comprises clock photoelectric coupled circuit, control photoelectric coupled circuit, the Voltage-output photoelectric coupled circuit be connected with A/D change-over circuit 3 output terminals.Wherein, the clock photoelectric coupled circuit is connected with the 8th port SCLK, is the clock control of master control system to this voltage detecting circuit; Control photoelectric coupled circuit and be connected with the 7th port CS, master control system is implemented to control to this voltage detecting circuit by this passage; The input end VDC-OUT of Voltage-output photoelectric coupled circuit is connected with the 6th port DOUT, receives the voltage signal detected for master control system.
The utility model testing circuit adopts the difference measurement mode, directly measures busbar voltage, has solved common mode interference and the resistance temperature is floated problem, and circuit is simple, cost is low; In addition, the utility model testing circuit is provided with light-coupled isolation high speed transmission circuit 4, can realize electrical isolation and long-distance transmissions.
The foregoing is only preferential embodiment of the present utility model, the utility model is not limited to above-mentioned embodiment, as long as within realizing that with basic identical means the technical scheme of the utility model purpose all belongs to protection domain of the present utility model.
Claims (9)
1. a H half-bridge IPM module busbar voltage detecting circuit is characterized in that comprising:
Differential input circuit (1), its positive and negative input end (+Vin ,-Vin) with the positive and negative output terminal of H half-bridge IPM module busbar voltage, be connected respectively;
Impedance inverter circuit (2), its input end is connected with Differential input circuit (1) output terminal;
A/D change-over circuit (3), its input end is connected with impedance inverter circuit (2) output terminal, for input signal is carried out to analog to digital conversion;
Light-coupled isolation high speed transmission circuit (4), its input end is connected with A/D change-over circuit (3) output terminal.
2. a kind of H half-bridge IPM module busbar voltage detecting circuit according to claim 1, it is characterized in that: described Differential input circuit (1) comprising: by first differential amplifier (U1B) of outside direct current supply; Be separately positioned on the first resistance (R1), the second resistance (R2) between the positive and negative input end of the H half-bridge IPM positive and negative output terminal of module busbar voltage and the first differential amplifier (U1B); Between the positive input terminal that is arranged on the first differential amplifier (U1B) and ground and in parallel the 3rd resistance (R3) and the first electric capacity (C1); Be arranged on the negative input end of the first differential amplifier (U1B) and the 4th resistance (R4) between output terminal; Wherein, the output terminal that the output terminal of described the first differential amplifier (U1B) is described Differential input circuit (1).
3. a kind of H half-bridge IPM module busbar voltage detecting circuit according to claim 2, it is characterized in that: described Differential input circuit (1) also is provided with diode clamp holding circuit (5), and described diode clamp holding circuit (5) comprises the first diode (D1), the second diode (D2), the 3rd diode (D3) and the 4th diode (D4); The negative pole of described the first diode (D1) and the second diode (D2) is connected and connects the power supply positive input, and the positive pole of the first diode (D1) and the second diode (D2) is the positive and negative input end of the first differential amplifier (U1B) respectively; The positive pole of described the 3rd diode (D3) and the 4th diode (D4) is connected and connects power-input, and the 3rd diode (D3) and the negative pole of the 4th diode (D4) are connected respectively the positive and negative input end of the first differential amplifier (U1B).
4. a kind of H half-bridge IPM module busbar voltage detecting circuit according to claim 1, it is characterized in that: described impedance inverter circuit (2) comprises the second differential amplifier (U1A), the positive input terminal of described the second differential amplifier (U1A) is connected with described Differential input circuit (1) output terminal, the negative input end of described the second differential amplifier (U1A) is connected with its output terminal, the output terminal that the output terminal of described the second differential amplifier (U1A) is described impedance inverter circuit (2).
5. according to the described a kind of H half-bridge IPM module busbar voltage detecting circuit of claim 2 or 3, it is characterized in that: the model of described the first differential amplifier (U1B) is TL082.
6. a kind of H half-bridge IPM module busbar voltage detecting circuit according to claim 4, it is characterized in that: the model of described the second differential amplifier (U1A) is TL082.
7. a kind of H half-bridge IPM module busbar voltage detecting circuit according to claim 4, it is characterized in that: be parallel with the 5th resistance (R5) and TVS pipe (TVS1) between described impedance inverter circuit (2) output terminal and ground, the plus earth of described TVS pipe (TVS1).
8. a kind of H half-bridge IPM module busbar voltage detecting circuit according to claim 1, it is characterized in that: described A/D change-over circuit (3) is AD conversion chip (U2), and its model is MAX1241.
9. a kind of H half-bridge IPM module busbar voltage detecting circuit according to claim 1 is characterized in that: described light-coupled isolation high speed transmission circuit (4) comprises the clock photoelectric coupled circuit that is connected with A/D change-over circuit (3) output terminal, controls photoelectric coupled circuit, Voltage-output photoelectric coupled circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203349462U CN203337724U (en) | 2013-06-09 | 2013-06-09 | H half-bridge IPM module bus voltage detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203349462U CN203337724U (en) | 2013-06-09 | 2013-06-09 | H half-bridge IPM module bus voltage detection circuit |
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| Publication Number | Publication Date |
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| CN203337724U true CN203337724U (en) | 2013-12-11 |
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| CN2013203349462U Expired - Fee Related CN203337724U (en) | 2013-06-09 | 2013-06-09 | H half-bridge IPM module bus voltage detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323660A (en) * | 2013-06-09 | 2013-09-25 | 广东明阳龙源电力电子有限公司 | H half-bridge IPM bus voltage detection circuit |
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2013
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323660A (en) * | 2013-06-09 | 2013-09-25 | 广东明阳龙源电力电子有限公司 | H half-bridge IPM bus voltage detection circuit |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131211 Termination date: 20190609 |