CN221509403U - Optocoupler driving circuit, electronic circuit and electronic equipment - Google Patents
Optocoupler driving circuit, electronic circuit and electronic equipment Download PDFInfo
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Abstract
The utility model provides an optocoupler driving circuit, an electronic circuit and electronic equipment, which are used for driving an optocoupler diode and an optocoupler transistor in an optocoupler, and comprise the following components: the first driving circuit comprises a first low-voltage amplifying module, a first low-voltage switching tube, a second low-voltage compensation resistive unit, a first low-voltage compensation unit, a first voltage division unit and a first compensation capacitor unit; according to the utility model, the input voltage of the branch circuit where the optocoupler diode is positioned is replaced by the internal power supply voltage from the original first high voltage, so that the original high-voltage amplifying module, the high-voltage switching tube, the high-voltage compensation resistive unit and the high-voltage compensation unit can be replaced by the first low-voltage amplifying module, the first low-voltage switching tube, the second low-voltage compensation resistive unit and the first low-voltage compensation unit which all adopt low-voltage processes, and the circuit cost is reduced; meanwhile, the loop stability of the optocoupler driving circuit is maintained by additionally arranging the first compensation capacitor unit.
Description
Technical Field
The present utility model relates to the field of USB charging, and in particular, to an optocoupler driving circuit, an electronic circuit, and an electronic device
Background
TL431 chip is a controllable precision voltage regulator source, and is used to replace a voltage regulator diode in many cited scenarios, such as a digital voltmeter, an operational amplifier circuit, an adjustable voltage source, a switching power supply, and the like.
Referring to fig. 1, fig. 1 is a schematic diagram of a conventional optocoupler driving circuit with an external TL 431; the external TL431 is used to stabilize the dynamic current flowing through the optocoupler diode and perform loop compensation on the whole optocoupler driving circuit; and the optocoupler diode transfers the dynamic current to the optocoupler transistor through an optical signal. The transfer function of the optocoupler driving circuit is specifically as follows: if the dynamic resistance of the optocoupler diode is ignored, the dynamic current flowing through the optocoupler diode is:
wherein I led(s) is used to characterize the dynamic current; vout(s) is used to characterize the output voltage of the left ACDC circuit; vt(s) is used to characterize the output voltage of the optocoupler diode; r2 is used to characterize the first compensation resistance.
Vout(s) is divided by a first voltage dividing resistor R1 and a second voltage dividing resistor R2 to obtain a first feedback voltage Vfb. Since the first feedback voltage Vfb is virtually grounded, the output voltage Vt(s) of the optocoupler diode is obtained by the integrator principle as:
Wherein, C1 is used for representing the first compensation capacitance unit; s is used to characterize complex variables.
In combination with the output voltage Vt(s) of the optocoupler diode, the dynamic current I led(s) can be further obtained as follows:
As can be seen from analysis of the optocoupler transistor, the error voltage Verr output by the collector of the optocoupler transistor is equal to the product of the collector current Ic of the optocoupler transistor and the impedance to ground at the point, namely:
Wherein R3 is used to characterize the second compensation resistance; c3 is used to characterize the second compensation capacitance.
Because the collector current Ic of the optocoupler transistor has the following relationship with the dynamic current I led(s) flowing through the optocoupler diode:
Ic(s)＝Iled(s)·CTR；
Wherein CTR is used to characterize the current transfer ratio between the optocoupler transistor and the optocoupler diode.
The loop transfer function of the optocoupler driving circuit is thus obtained as:
Wherein, The circuit is used for representing that the loop of the optocoupler driving circuit is subjected to 0db pole crossing compensation through a first divider resistor R1, a first compensation resistor R2, a second compensation resistor R3 and a first compensation capacitor unit C1; The circuit is used for representing that a loop of the optocoupler driving circuit is subjected to first zero compensation through a first divider resistor R1 and a first compensation capacitor unit C1; Which is used to characterize the second point compensation of the loop of the optocoupler drive circuit via the second compensation resistor R3 and the second compensation capacitor C2.
As can be seen from the description, the optocoupler driving circuit of the external TL431 forms a type two compensation to realize loop stabilization; however, the TL431 chip is externally arranged in the optocoupler driving circuit, so that the circuit area is increased, and the circuit cost is increased.
Referring to fig. 2, in the prior art, the TL431 chip is built in the optocoupler driving circuit, so as to reduce the circuit area and the circuit cost; the built-in TL431 chip in fig. 2 is composed of an operational amplifier and a switching tube. Meanwhile, the loop transfer function of the optocoupler driving circuit of the built-in TL431 is identical to that of the optocoupler driving circuit of the external TL431, and will not be described herein. However, the problem in the prior art is that the built-in TL431 chip, the first compensating resistor R2 and the first compensating capacitor unit C1 are all powered by the high voltage output by the ACDC on the left side, so that the built-in TL431 chip, the first compensating resistor R2 and the first compensating capacitor unit C1 all need to be of a high voltage resistant type, and the circuit cost is further increased.
Therefore, providing a low-voltage optocoupler driving circuit with the built-in TL431 has become a technical problem to be solved in the industry.
Disclosure of utility model
The utility model provides an optocoupler driving circuit, an electronic circuit and electronic equipment, which are used for providing the optocoupler driving circuit with low cost and stability.
According to a first aspect of the present utility model there is provided an optocoupler driving circuit for driving an optocoupler diode and an optocoupler transistor in an optocoupler; wherein the optocoupler diode and the optocoupler transistor are coupled by an optical signal, the circuit comprising: first drive circuit and second drive circuit:
the first driving circuit includes: the low-voltage compensation circuit comprises a first low-voltage amplifying module, a first low-voltage switching tube, a second low-voltage compensation resistive unit, a first low-voltage compensation unit, a first voltage division unit and a first compensation capacitor unit; the second driving circuit includes: a first compensation resistive unit and a second compensation capacitive unit;
The first compensation capacitor unit is coupled between a first high voltage and the output end of the first voltage dividing unit; the input end and the output end of the first voltage dividing unit are respectively coupled to a first high voltage and a first input end of the first low voltage amplifying module, and the first voltage dividing unit is used for dividing the first high voltage to obtain a first feedback voltage and outputting the first feedback voltage to the first low voltage amplifying module; a second input end of the first low-voltage amplifying module inputs a first reference voltage; the first low-voltage compensation unit is coupled between the first input end of the first low-voltage amplification module and the second end of the first low-voltage switching tube; the first end of the second low-voltage compensation resistive unit is coupled to the second end of the first low-voltage switch tube, and the negative electrode of the photo-coupler diode is grounded; the second compensation capacitor unit is coupled between the first end and the second end of the optocoupler transistor;
If the second end of the second low-voltage compensation resistive unit is coupled to the positive electrode of the optocoupler diode, the first end of the first low-voltage switch tube is coupled to the internal power supply voltage positive electrode, the first compensation resistive unit is coupled between the first end of the optocoupler transistor and the ground end, and the first end of the optocoupler transistor is used as an output end;
If the second end of the second low-voltage compensation resistive unit is coupled to the internal power supply voltage positive electrode, the first end of the first low-voltage switching tube is coupled to the positive electrode of the photo-coupling diode; the first compensating resistive unit is coupled between the second end of the optocoupler transistor and a second high voltage, and the second end of the optocoupler transistor is used as an output end.
Optionally, the first voltage dividing unit and the first compensation capacitor unit are used together for performing first zero compensation on loop stability of the optocoupler driving circuit; the first compensation resistive unit and the second compensation capacitance unit are used for performing second-point compensation on loop stability of the optocoupler driving circuit; the first compensation resistive unit, the second low-voltage compensation resistive unit, the first low-voltage compensation unit and the first voltage division unit are commonly used for performing 0db pole crossing compensation on loop stability of the optocoupler driving circuit.
Optionally, the first low-voltage switch tube includes a PMOS tube, and the second end of the second low-voltage compensation resistive unit is coupled to the anode of the photo-coupling diode; a first end of the first low-voltage switch tube is coupled to the internal power supply voltage anode; the second compensation capacitor unit is coupled between the first end of the optocoupler transistor and the second end of the optocoupler transistor, and the second end of the optocoupler transistor is connected to a second high voltage; the first compensating resistive element is coupled between a first terminal of the phototransistor and ground.
Optionally, the first low-voltage switching tube further includes an NMOS tube, and then the second end of the second low-voltage compensation resistive unit is coupled to the internal power supply voltage anode, and the first end of the first low-voltage switching tube is coupled to the anode of the optocoupler diode; the second compensation capacitance unit is coupled between the second end of the optocoupler transistor and the first end of the optocoupler transistor; the first compensating resistive element is coupled between the second high voltage and a second terminal of the optocoupler transistor.
Optionally, the first low voltage amplifying module includes an operational amplifier.
Optionally, the first low voltage compensation unit includes a third low voltage compensation capacitor subunit.
Optionally, the first low voltage compensation unit includes a third low voltage compensation capacitor subunit and a third low voltage compensation resistive subunit.
Optionally, the first compensation capacitor unit, the second compensation capacitor unit, and the third low voltage compensation resistive subunit each include a single capacitor.
Optionally, the first compensation capacitor unit, the second compensation capacitor unit and the third low-voltage compensation resistive subunit each include a capacitor array; the capacitor array is formed by connecting a plurality of capacitors in series and parallel.
Optionally, the first low-voltage switch tube, the first low-voltage amplifying module, the second low-voltage compensation resistive unit, the third low-voltage compensation capacitor subunit and the third low-voltage compensation resistive subunit are all manufactured by adopting a low-voltage process.
Optionally, the first voltage dividing unit includes: a first voltage dividing resistive subunit and a second voltage dividing resistive subunit; the first voltage dividing resistive subunit is coupled between the first high voltage and the non-inverting input end of the first low voltage amplifying module, and the second end of the first voltage dividing resistive subunit is used as the output end of the first feedback voltage; the second voltage dividing resistive subunit is coupled between a second end of the first voltage dividing resistive subunit and a ground end; the first compensation capacitor unit and the first voltage division resistance subunit are commonly used for performing first zero compensation on loop stability of the optocoupler driving circuit.
Optionally, the second low voltage compensation resistive unit, the first voltage division resistive subunit, and the second voltage division resistive subunit, the third low voltage compensation resistive subunit each include a single resistor.
Optionally, the second low-voltage compensation resistive unit, the first voltage division resistive subunit, the second voltage division resistive subunit and the third low-voltage compensation resistive subunit all include a resistor array, wherein the resistor array is formed by connecting a plurality of resistor strings in parallel.
According to a second aspect of the present utility model, there is provided an electronic circuit comprising the optocoupler driving circuit of the first aspect of the present utility model and optionally provided.
According to a third aspect of the present utility model there is provided an electronic device comprising the electronic circuit provided by the second aspect of the present utility model.
According to the optocoupler driving circuit provided by the utility model, the input voltage of the branch circuit where the optocoupler diode is positioned is replaced by the internal power supply voltage from the original first high voltage, so that the original high-voltage amplifying module, the high-voltage switching tube, the high-voltage compensation resistive unit and the high-voltage compensation unit can be replaced by the first low-voltage amplifying module, the first low-voltage switching tube, the second low-voltage compensation resistive unit and the first low-voltage compensation unit which all adopt low-voltage processes, and the circuit cost is reduced; meanwhile, the loop stability of the optocoupler driving circuit is maintained by additionally arranging the first compensation capacitor unit.
Drawings
The utility model will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a circuit diagram of an optocoupler driver circuit of an external TL431 in the prior art;
Fig. 2 is a circuit configuration diagram of an optocoupler driving circuit with a high voltage TL431 built in the prior art;
Fig. 3 (a) is a circuit configuration diagram of an optocoupler driving circuit according to an embodiment of the present utility model;
Fig. 3 (b) is a circuit configuration diagram of an optocoupler driving circuit according to another embodiment of the present utility model;
fig. 4 (a) is a second circuit configuration diagram of the optocoupler driving circuit according to the embodiment of the present utility model;
Fig. 4 (b) is a second circuit configuration diagram of an optocoupler driving circuit according to another embodiment of the present utility model;
fig. 5 is a circuit configuration diagram of an optocoupler driving circuit according to another embodiment of the present utility model.
Reference numerals:
10-a first driving circuit;
11-a first low voltage compensation unit;
12-a first voltage dividing unit;
20-a second driving circuit;
VPP-second high pressure;
Vout—a first high voltage;
vdd-internal supply voltage positive;
Vfb—a first feedback voltage;
vref—a first reference voltage;
C1-a first compensation capacitor unit;
A C2-second compensation capacitor unit;
a C3-third low voltage compensation capacitor subunit;
R1-a first compensating resistive element;
R2-a second low voltage compensation resistive element;
R3-a third low voltage compensating resistive subunit;
R4-a first partial pressure resistive subunit;
R5-a second voltage dividing subunit;
An OP-first low voltage amplification module;
M1-a first low-voltage switching tube.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 3 (a) and fig. 3 (b), an embodiment of the present utility model provides an optocoupler driving circuit for driving an optocoupler diode and an optocoupler transistor in an optocoupler; wherein the optocoupler diode and the optocoupler transistor are coupled by an optical signal, the circuit comprising: first drive circuit 10 and second drive circuit 20:
The first driving circuit 10 includes: the low-voltage compensation circuit comprises a first low-voltage amplification module OP, a first low-voltage switching tube M1, a second low-voltage compensation resistive unit R2, a first low-voltage compensation unit 11, a first voltage division unit 12 and a first compensation capacitor unit C1; the second driving circuit 20 includes: a first compensating resistive unit R1 and a second compensating capacitive unit C2;
Wherein the first compensation capacitor unit C1 is coupled between the first high voltage Vout and the output terminal of the first voltage dividing unit 12; the input end and the output end of the first voltage dividing unit 12 are respectively coupled to a first high voltage Vout and a first input end of the first low voltage amplifying module OP, and the first voltage dividing unit 12 is configured to divide the first high voltage Vout to obtain a first feedback voltage Vfb and output the first feedback voltage Vfb to the first low voltage amplifying module OP; a second input end of the first low-voltage amplifying module OP inputs a first reference voltage Vref; the first low voltage compensation unit 11 is coupled between the first input terminal of the first low voltage amplifying module OP and the second terminal of the first low voltage switching tube M1; the first end of the second low-voltage compensation resistive unit R2 is coupled to the second end of the first low-voltage switching tube M1, and the negative electrode of the optocoupler diode OPTO is grounded; the second compensating capacitor unit C2 is coupled between the first end and the second end of the optocoupler transistor;
Referring to fig. 3 (b), if the second end of the second low-voltage compensation resistive unit R2 is coupled to the positive electrode of the optocoupler diode OPTO, the first end of the first low-voltage switching tube M1 is coupled to the internal power voltage positive electrode Vdd, the first compensation resistive unit R1 is coupled between the first end of the optocoupler transistor and the ground, and the first end of the optocoupler transistor is used as the output end;
Referring to fig. 3 (a), if the second end of the second low-voltage compensation resistive unit R2 is coupled to the internal power voltage positive electrode Vdd, the first end of the first low-voltage switching tube M1 is coupled to the positive electrode of the optocoupler diode OPTO; the first compensating resistive element R1 is coupled between the second terminal of the optocoupler transistor and a second high voltage, and the second terminal of the optocoupler transistor is used as an output terminal.
The technical scheme is adopted to provide the optical coupler driving circuit with low cost and stability.
The specific principle is as follows:
Replacing the first high voltage Vout of the original input optocoupler diode with an internal power supply voltage anode Vdd; the first high voltage Vout is specifically the output voltage of the flyback converter in the circuit structure where the second driving circuit 20 is located. Because the high voltage is replaced by low voltage, the first low voltage amplifying module, the first low voltage switching tube, the second low voltage compensation resistive unit and the first low voltage compensation unit are not required to be manufactured by a high voltage process, and only the low voltage process is required to be used for manufacturing, so that the circuit cost is reduced. However, after replacing the first high voltage Vout with the internal power supply voltage, the loop stability of the optocoupler driving circuit is destroyed, and the principle is that: referring to fig. 2, as described in the background art, the loop transfer function forming the stable two-type compensation is as follows:
Wherein,
If the first high voltage Vout is replaced with the internal power supply voltage, the loop transfer function becomes:
this transfer function does not allow for loop stabilization compared to the prior art stabilized type two compensated loop transfer function. Referring to fig. 3 (a) or fig. 3 (b), in order to achieve loop stability, the present utility model additionally adds the first compensating capacitor unit C1 compared with the prior art of fig. 2, so as to change the loop transfer function to:
Wherein, The transfer function is equivalent to the loop transfer function of the stable two-type compensation in the prior art, and the loop is stable.
The loop stability of the optocoupler driving circuit provided by the utility model is briefly described as follows: common compensation modes for loop stabilization include one-type compensation, two-type compensation and three-star compensation; wherein, the type one compensation has no zero point and only has one pole; the type II compensation has two poles and a zero; the three-type compensation packet includes three poles and two zeros. The loop transfer function of the optocoupler driving circuit provided by the embodiment of the utility model can be known, and the optocoupler driving circuit provided by the embodiment of the utility model has two poles and one zero point; wherein the 0db crossing pole isIs generated by the first compensation resistive unit R1, the second low-voltage compensation resistive unit R2, the first low-voltage compensation unit 11 and the first voltage division unit 12 in a compensation way; the second pole isIs generated by the common compensation of the first compensation resistive unit R1 and the second compensation capacitive unit C2; the first zero point isIs generated by the first voltage division unit 12 and the first compensation capacitance unit C1 together in a compensation way.
The following describes other structures of the optocoupler driving circuit provided by the utility model in detail:
As a complementary embodiment, the different types of the first low-voltage switch tube M1 may cause the corresponding circuit structures of the first driving circuit 10 and the second driving circuit 20 to change; for example, referring to fig. 3 (b), if the first low-voltage switch tube M1 is a PMOS tube, the second end of the second low-voltage compensation resistive unit R2 is coupled to the anode of the photo-diode; a first end of the first low-voltage switch tube M1 is coupled to the internal power supply voltage positive electrode Vdd; the second compensation capacitor unit C2 is coupled between the first end of the optocoupler transistor and the second end of the optocoupler transistor, and the second end of the optocoupler transistor is connected to a second high voltage VPP; the first compensating resistive element R1 is coupled between the first terminal of the phototransistor and ground. Referring to fig. 3 (a), if the first low-voltage switching tube M1 is an NMOS tube, the second end of the second low-voltage compensating resistive unit R2 is coupled to the internal power voltage positive electrode Vdd, and the first end of the first low-voltage switching tube M1 is coupled to the positive electrode of the photo-coupler diode; the second compensation capacitor unit C2 is coupled between the second end of the optocoupler transistor and the first end of the optocoupler transistor; the first compensating resistive element R1 is coupled between the second high voltage VPP and the second terminal of the optocoupler transistor.
As a specific embodiment, the first low voltage amplifying module OP includes an operational amplifier. Of course, the amplifier may be another type of amplifier, such as a differential amplifier, and the specific scheme is determined according to actual requirements, which is not limited herein.
Referring to fig. 4 (a), as a specific embodiment, the first low voltage compensation unit 11 includes a third low voltage compensation capacitor subunit C3. In another embodiment, referring to fig. 4 (b), the first low voltage compensation unit 11 may also include a third low voltage compensation capacitor subunit C3 and a third low voltage compensation resistive subunit R3. It should be noted that, the first low-voltage switch tube M1, the first low-voltage amplifying module OP, the second low-voltage compensating resistive unit R2, the third low-voltage compensating capacitor subunit C3, and the third low-voltage compensating resistive subunit R3 are all manufactured by using a low-voltage process, so as to reduce the circuit cost. Of course, the embodiment provided in fig. 4 (a) and 4 (b) also corresponds to that in fig. 3 (b), and is not shown here.
As a specific embodiment, the first compensation capacitor unit C1, the second compensation capacitor unit C2, and the third low voltage compensation resistive subunit R3 each include a single capacitor. Of course, the first compensating capacitor unit C1, the second compensating capacitor unit C2, and the third low voltage compensating resistive subunit R3 may also include a capacitor array; the capacitor array is formed by connecting a plurality of capacitors in series and parallel. The specific scheme is determined according to actual requirements, and is not limited herein.
Referring to fig. 5, as an embodiment, the first voltage dividing unit 12 includes: a first voltage dividing resistive subunit R4 and a second voltage dividing resistive subunit R5; the first voltage dividing resistive subunit R4 is coupled between the first high voltage Vout and the non-inverting input terminal of the first low voltage amplifying module OP, and the second terminal of the first voltage dividing resistive subunit R4 is used as the output terminal of the first feedback voltage Vfb; the second voltage dividing resistive subunit R5 is coupled between the second terminal of the first voltage dividing resistive subunit R4 and the ground terminal; the first compensation capacitor unit C1 and the first voltage-dividing resistive subunit R4 are used together to perform a first zero compensation on loop stability of the optocoupler driving circuit. Of course, the embodiment provided in fig. 5 is also identical in fig. 3 (b), and is not shown here again.
As a specific embodiment, the second low voltage compensating resistive unit R2, the first compensating resistive unit R1, the first voltage dividing resistive subunit R4, the second voltage dividing resistive subunit R5, and the third low voltage compensating resistive subunit R3 each include a single resistor. Of course, the second low voltage compensating resistive unit R2, the first compensating resistive unit R1, the first voltage dividing resistive subunit R4, the second voltage dividing resistive subunit R5, and the third low voltage compensating resistive subunit R3 all include a resistor array, where the resistor array is formed by connecting a plurality of resistors in parallel. The specific scheme is determined according to actual requirements, and is not limited herein.
In summary, according to the optocoupler driving circuit provided by the utility model, the input voltage of the branch circuit where the optocoupler diode is positioned is replaced by the internal power supply voltage from the original first high voltage, so that the original high-voltage amplifying module, the high-voltage switching tube, the high-voltage compensation resistive unit and the high-voltage compensation unit can be replaced by the first low-voltage amplifying module, the first low-voltage switching tube, the second low-voltage compensation resistive unit and the first low-voltage compensation unit which all adopt low-voltage processes, and the circuit cost is reduced; meanwhile, the loop stability of the optocoupler driving circuit is maintained by additionally arranging the first compensation capacitor unit.
The embodiment of the utility model also provides an electronic circuit, which comprises the optocoupler driving circuit.
The embodiment of the utility model also provides electronic equipment comprising the electronic circuit.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (15)
1. An optocoupler driving circuit is used for driving an optocoupler diode and an optocoupler transistor in an optocoupler; wherein, the optocoupler diode and the optocoupler transistor are coupled through an optical signal, and the method is characterized by comprising the following steps: first drive circuit and second drive circuit:
The first driving circuit includes: the low-voltage compensation circuit comprises a first low-voltage amplifying module, a first low-voltage switching tube, a second low-voltage compensation resistive unit, a first low-voltage compensation unit, a first voltage division unit and a first compensation capacitor unit; the second driving circuit includes: a first compensation resistive unit and a second compensation capacitive unit;
The first compensation capacitor unit is coupled between a first high voltage and the output end of the first voltage dividing unit; the input end and the output end of the first voltage dividing unit are respectively coupled to a first high voltage and a first input end of the first low voltage amplifying module, and the first voltage dividing unit is used for dividing the first high voltage to obtain a first feedback voltage and outputting the first feedback voltage to the first low voltage amplifying module; a second input end of the first low-voltage amplifying module inputs a first reference voltage; the first low-voltage compensation unit is coupled between the first input end of the first low-voltage amplification module and the second end of the first low-voltage switching tube; the first end of the second low-voltage compensation resistive unit is coupled to the second end of the first low-voltage switch tube, and the negative electrode of the photo-coupler diode is grounded; the second compensation capacitor unit is coupled between the first end and the second end of the optocoupler transistor;
If the second end of the second low-voltage compensation resistive unit is coupled to the positive electrode of the optocoupler diode, the first end of the first low-voltage switch tube is coupled to the positive electrode of the internal power supply voltage, the first compensation resistive unit is coupled between the first end of the optocoupler transistor and the ground end, and the first end of the optocoupler transistor is used as an output end;
If the second end of the second low-voltage compensation resistive unit is coupled to the internal power supply voltage positive electrode, the first end of the first low-voltage switching tube is coupled to the positive electrode of the photo-coupling diode; the first compensating resistive unit is coupled between the second end of the optocoupler transistor and a second high voltage, and the second end of the optocoupler transistor is used as an output end.
2. The optocoupler driving circuit of claim 1, wherein the first voltage dividing unit and the first compensation capacitance unit are used together to perform a first zero compensation for loop stabilization of the optocoupler driving circuit; the first compensation resistive unit and the second compensation capacitance unit are used for performing second-point compensation on loop stability of the optocoupler driving circuit; the first compensation resistive unit, the second low-voltage compensation resistive unit, the first low-voltage compensation unit and the first voltage division unit are commonly used for performing 0db pole crossing compensation on loop stability of the optocoupler driving circuit.
3. The optocoupler drive circuit of claim 1, wherein the first low voltage switching tube comprises a PMOS tube, and the second end of the second low voltage compensation resistive unit is coupled to the anode of the optocoupler diode; a first end of the first low-voltage switch tube is coupled to the internal power supply voltage anode; the second compensation capacitor unit is coupled between the first end of the optocoupler transistor and the second end of the optocoupler transistor, and the second end of the optocoupler transistor is connected to a second high voltage; the first compensating resistive element is coupled between a first terminal of the phototransistor and ground.
4. The optocoupler drive circuit of claim 1, wherein the first low voltage switching tube further comprises an NMOS tube, the second end of the second low voltage compensation resistive unit is coupled to the internal supply voltage anode, and the first end of the first low voltage switching tube is coupled to the anode of the optocoupler diode; the second compensation capacitance unit is coupled between the second end of the optocoupler transistor and the first end of the optocoupler transistor; the first compensating resistive element is coupled between the second high voltage and a second terminal of the optocoupler transistor.
5. The optocoupler drive circuit of claim 1, wherein the first low voltage amplification module comprises an operational amplifier.
6. The optocoupler drive circuit of claim 1 wherein the first low voltage compensation unit comprises a third low voltage compensation capacitor subunit.
7. The optocoupler drive circuit of claim 1 wherein the first low voltage compensation unit comprises a third low voltage compensation capacitor subunit and a third low voltage compensation resistive subunit.
8. The optocoupler drive circuit of claim 7, wherein the first compensation capacitance unit, the second compensation capacitance unit, and the third low voltage compensation resistive subunit each comprise a single capacitance.
9. The optocoupler drive circuit of claim 7, wherein the first, second, and third low voltage compensation resistive sub-units each comprise a capacitor array; the capacitor array is formed by connecting a plurality of capacitors in series and parallel.
10. The optocoupler driving circuit of claim 7, wherein the first low voltage switching tube, the first low voltage amplification module, the second low voltage compensation resistive unit, the third low voltage compensation capacitive subunit, and the third low voltage compensation resistive subunit are all fabricated using a low voltage process.
11. The optocoupler driving circuit of claim 7, wherein the first voltage dividing unit comprises: a first voltage dividing resistive subunit and a second voltage dividing resistive subunit; the first voltage dividing resistive subunit is coupled between the first high voltage and the non-inverting input end of the first low voltage amplifying module, and the second end of the first voltage dividing resistive subunit is used as the output end of the first feedback voltage; the second voltage dividing resistive subunit is coupled between a second end of the first voltage dividing resistive subunit and a ground end; the first compensation capacitor unit and the first voltage division resistance subunit are commonly used for performing first zero compensation on loop stability of the optocoupler driving circuit.
12. The optocoupler drive circuit of claim 11, wherein the second low voltage compensation resistive unit, the first voltage division resistive subunit, and the second voltage division resistive subunit, the third low voltage compensation resistive subunit each comprise a single resistor.
13. The optocoupler drive circuit of claim 11, wherein the second low voltage compensation resistive unit, the first voltage division resistive subunit, and the second and third low voltage compensation resistive subunits each comprise a resistor array, wherein the resistor array is formed by a plurality of resistor strings in parallel.
14. An electronic circuit comprising an optocoupler drive circuit according to any one of claims 1 to 13.
15. An electronic device comprising the electronic circuit of claim 14.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322937780.XU CN221509403U (en) | 2023-10-30 | 2023-10-30 | Optocoupler driving circuit, electronic circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322937780.XU CN221509403U (en) | 2023-10-30 | 2023-10-30 | Optocoupler driving circuit, electronic circuit and electronic equipment |
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| CN221509403U true CN221509403U (en) | 2024-08-09 |
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| CN202322937780.XU Active CN221509403U (en) | 2023-10-30 | 2023-10-30 | Optocoupler driving circuit, electronic circuit and electronic equipment |
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| CN (1) | CN221509403U (en) |
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