CN102637054B - 50-ampere power consumption balanced-type high-power constant-current source - Google Patents

Abstract

The 50 ampere power consumption balanced high-power constant current source of the present invention belongs to the technical field of electronic equipment, and has the following structure: the voltage control module (1) generates a continuously adjustable voltage signal V _C for controlling the transconductance amplifier (3), and the transconductance amplifier (3) The conductance amplifier (3) generates a constant current signal to drive the load (5), the safety protection circuit module (4) provides safety protection for the load, the output port V _A of the voltage control module (1) and the output port of the transconductance amplifier module (3) V _F is connected to the mode selection input terminal of the output display module (2). The invention provides a constant current source for driving a high-power semiconductor laser array, the maximum output current can reach 50 amperes, the constant current source adopts a power consumption balanced structure, so that the power loss and heat can be evenly dispersed and discharged in time to avoid accumulation , and enhance the redundancy of the constant current driver, thereby improving the stability, reliability and maximum output current of the high-power constant current source.

Description

50 amp power consumption balanced high power constant current source

technical field

The invention belongs to the technical field of electronic equipment, in particular to a 50 ampere power consumption balanced high-power constant current source.

Background technique

With the continuous increase of power consumption and the high functionality of energy utilization, high-current technology is a field that is rapidly emerging in the generation, transmission, conversion, and control of electric energy. At the same time, as a branch of stable power supply, high-power constant current source has a very wide range of applications in the research field of power supply. However, in many occasions where a constant current source should be used, the regulated power supply is still not used properly. In most cases, the high-precision current source with large operating current still needs to be designed and realized by the user. Therefore, it is urgent to design a practical high-power constant current source, and provide complete services for driving various high-power loads with its superior cost performance.

In the published patents of constant current drive power supply, such as application number 200710056012.6, in the high-power laser diode driver, the main concern is the protection of the laser diode. The final stage of the driver uses a single power tube to control the current, which cannot make the The maximum output current is limited, the power loss is large and the maximum output current is not large enough to exceed 10 amperes, and the reliability is low. If the power tube of the final stage is damaged, the entire instrument will not work.

Contents of the invention

In order to overcome the shortcomings of the existing high-power constant current sources such as insufficient maximum output current, short service life of power devices, and low system reliability due to large power loss, the present invention provides a desktop constant current source for driving high-power loads. Flow source instrument, the high-power constant current source adopts a power consumption balanced structure, so that the power loss and heat can be evenly distributed and discharged in time without accumulation, and the redundancy of the constant current driver is enhanced, thereby improving the stability of the high-power constant current source performance, reliability and maximum output current.

The technical problem of the present invention is solved by the following measures: the 50 ampere power consumption balanced high-power constant current source structure includes a voltage control module 1, an output display module 2, a transconductance amplifier 3 and a safety protection circuit module 4. In the voltage control module 1, the voltage reference chip, the current limiting circuit and the voltage regulation circuit are connected in sequence, the voltage reference provides a stable and accurate reference voltage to ensure the stability of the output of the high-power constant current source, and the voltage regulation circuit is limited by the current limiting circuit The control voltage signal V _C is adjusted. The output display module 2 is composed of mode selection and LED display connected sequentially. The output terminal V _A of the current limiting circuit in the voltage control module 1 and the output terminal V _F of the transconductance amplifier 3 are used as the display of the limited current value and the output current value respectively. The control voltage is connected to the mode selection terminal of the output display module 2. The control signal of the safety protection circuit module 4 is respectively connected to the input terminal of the transconductance amplifier and the load to realize the function of controlling and protecting the high-power constant current source. The positive-phase end of the load 5 is connected to a high-power regulated power supply, and the inverting end is connected to the balanced power amplification module of the transconductance amplifier 3 .

The transconductance amplifier 3 of the present invention is composed of a feedforward amplifier, a balanced power amplification module, a sampling resistor array and a feedback circuit connected in sequence to form a complete negative feedback system. The output terminal of the voltage control module 1 is connected to the non-inverting input terminal of the feedforward amplifier circuit of the transconductance amplifier 3, and the output terminal of the feedforward amplifier circuit is connected to the input terminal of the balanced power amplification module of the transconductance amplifier 3; the balanced power amplification module adopts Composite Darlington structure, the emitter follower as its driver stage provides the base drive signal for the output stage, the output stage is composed of a parallel current sharing circuit composed of multiple identical power transistors, and the base of each transistor is connected in series with current sharing resistors; The sampling resistor array is composed of multiple identical precision power resistors. One end of each sampling resistor is connected to the ground, and the other end is respectively connected to the emitter node of each branch of the parallel current sharing circuit, and is connected to the feedback through the summing resistor array. The non-inverting input end of the circuit; the feedback circuit is an in-phase summing operation circuit, and its output end is connected to the inverting input end of the feedforward amplifier circuit to form a feedback loop of the transconductance amplifier.

Concrete technical scheme of the present invention is as follows:

A high-power constant current source with balanced power consumption, which has four parts: a voltage control module 1, an output display module 2, a transconductance amplifier 3, and a safety protection circuit module 4; wherein, the anti-surge protection of the safety protection circuit module 4 The circuit output terminal is connected with the load 5; the control signal output port of the soft start protection circuit of the safety protection circuit module 4 is connected with the transconductance amplifier 3; the output port V _A of the voltage control module 1 is connected with the output port V _F of the transconductance amplifier 3 To the mode selection input terminal of the output display module 2, the current limit value and the actual current value are displayed by the output display module 2; the output port V _C of the voltage control module 1 is connected with the transconductance amplifier 3, and the output terminal of the transconductance amplifier 3 is connected with the transconductance amplifier 3 simultaneously. load 5 connection;

The voltage control module 1 includes: pin 1 of the voltage reference chip U1 is connected to the power supply VCC1, pin 3 is grounded, pin 2 is connected to pin 3 of the single op amp U2 through a resistor R1, pin 4 of the single op amp U2 is grounded, pin 7 is connected to Power supply VCC1, pin 2 is grounded through resistor R3, pin 2 of single op amp U2 is connected to pin 6 of single op amp U2 through resistor R2, pin 6 of single op amp U2 is connected to pin 3 of potentiometer R _p1 , and potentiometer R _p1 Pin 1 is grounded, pin 2 is connected to output port V _A of voltage control module 1, output port V _A is connected to mode selection input terminal of output display module 2, and pin 2 of potentiometer R _p1 is connected to 3 of single operational amplifier U3 through resistor R4 Pin, pin 4 of single op amp U3 is grounded, pin 7 is connected to power supply VCC1, pin 2 is connected to pin 6 of single op amp U3 through resistor R5, pin 6 of single op amp U3 is connected to pin 3 of potentiometer R _p2 , potentiometer R Pin 1 of _p2 is grounded, and pin 2 is connected to the output port V _C of voltage control module 1;

The transconductance amplifier 3 includes: the 4 pins of the dual operational amplifier U4A are grounded, the 8 pins are connected to the power supply VCC1, the 2 pins are connected to the output port V _C of the voltage control module 1 through the resistor R6, and the 3 pins are connected to the transconductance amplifier 3 through the resistor R7 The output port V _F of the dual op amp U4A is connected to the 1 pin of the dual op amp U4A through the capacitor C1, and the 1 pin of the dual op amp U4A is connected to the 1 pin of the N-type Darlington power transistor T _E through the resistor R8. Pin 3 of the N-type Darlington power transistor _TE is connected to the power supply VCC1, pin 2 is grounded through the resistor R9, and pin 2 is connected to a pin of each resistor in a group of precision resistors R _b1 ~ R _bn with the same parameters at the same time. The other pins of each resistor in the precision resistors R _b1 ~ R _bn are respectively connected to pin 1 of a transistor in a group of N-channel bipolar junction power transistors T1 ~ Tn of the same model, and the N-channel bipolar junction power transistors The 3 pins of each transistor in T1～Tn are connected together, and connected to the negative pole of the load 5, the positive pole of the load 5 is connected to the power supply VCC2, and the 2 pins of each transistor in the N-channel bipolar junction power transistors T1～Tn are respectively Ground through a set of precision power resistors R _e1 ~ R _en with the same parameters, and at the same time, the 2 pins of each transistor in the N-channel bipolar junction power transistors T1 ~ Tn are respectively passed through a set of resistors R with the same parameters One of the resistors from _a1 to R _an is connected to pin 5 of the dual op amp U4B, pin 5 of the dual op amp U4B is grounded through the resistor R10, pin 6 is grounded through the resistor R11, pin 6 of the dual op amp U4B is connected to the dual op amp through the resistor R12 Put the pin 7 of U4B, the pin 7 of the dual operational amplifier U4B is connected to the output port V _F of the transconductance amplifier 3, and the output port V _F is connected to the mode selection input port of the output display module 2.

The output display module 2 and the safety protection circuit module 4 can be the same or similar to existing circuits that can realize functions such as output display, anti-surge impact protection and soft start protection, and can also be implemented according to the circuit of the present invention , see embodiment 4 and embodiment 5 for the specific structure.

The load 5 is a load that needs to be powered by the power consumption balanced high-power constant current source of the present invention, and may be a high-power laser diode array and other devices that require high-power constant-current drive.

The types and parameters of the components and parts in the voltage control module 1 of the present invention can be selected as follows: the model of the reference voltage chip U1 is MC1403, the models of the single op amp U2 and the single op amp U3 are Op07, and the value of the resistance R1 is 15kΩ, The value of resistor R2 and resistor R3 is 30kΩ, the value of resistor R4 and resistor R5 is 10kΩ, the value of potentiometer R _P1 and potentiometer R _P2 is 100kΩ, the power supply VCC1 is 15V, and the rated power is 30W.

The type and parameters of the components and parts used in the transconductance amplifier 3 of the present invention can be selected as: the double operational amplifier U4A and the dual operational amplifier U4B are integrated dual operational amplifiers LM358, and the T _E model of the N-type Darlington power transistor is TIP132 , the value of capacitor C1 is 4.7μF, the number of tubes in N-channel bipolar junction power transistor array T1~Tn is 12, the model is 2N3055, the resistance value of resistor R6 and resistor R7 is 10kΩ, the resistance value of resistor R8 and resistor R9 The resistance value of resistor R10~R12 is 10kΩ, the number of resistors in resistor array R _a1 ~R _an is 12, and the resistance value is 10kΩ, the number of resistors in resistor array R _b1 ~R _bn is 12, the resistance value is 100Ω, the precision sampling resistor array R _e1 ~ R _en has 12 resistors, the resistance value is 0.1Ω, the power supply VCC1 is 15V, the rated power is 30W, the power supply VCC2 is 12V, the rated power is 1000W .

The 50 ampere power consumption balanced high-power constant current source of the present invention has the following beneficial effects:

1. Adopt power consumption balance design, the maximum output current can reach 50 amperes, and it can be adjusted continuously;

2. Regarding the voltage control module 1, the control voltage signal V _C is completely controlled and the voltage signal V _A is limited to ensure that the output current changes within a controllable range while reducing the number of circuit components and design costs.

3. Regarding the transconductance amplifier 3, it adopts a composite Darlington structure, and the high-gain power device of its drive stage provides a sufficiently large drive signal for the output stage, and at the same time increases the open-loop gain of the feedforward amplifier circuit and improves the feedback system. Stability; the output stage uses power devices in parallel with a current sharing circuit, so that the total output current is dispersed, and the power loss is shared by multiple power devices. In this way, the heat can be discharged in time without accumulation, and the redundancy of the driver can be enhanced, so the reliability of the power supply under high-load working conditions can be greatly improved. In the precision power resistor arrays R _e1 ~ R _en , each precision power The resistor unit is connected to the emitter terminal of the parallel current sharing branch, which is not only the sampling resistor of the feedback loop, but also the emitter current sharing resistor of the parallel circuit, which further improves the power consumption balance during power amplification, and at the same time, the parallel sampling resistor array can reduce its Power loss at the output of the load.

Description of drawings:

Fig. 1 is a block diagram of the overall circuit structure of a 50 ampere power consumption balanced high-power constant current source of the present invention.

Fig. 2 is a voltage control module circuit of a 50 ampere power consumption balanced high-power constant current source of the present invention.

Fig. 3 is a circuit diagram of a transconductance amplifier of a 50 ampere power consumption balanced high-power constant current source of the present invention.

Fig. 4 is the functional block diagram of the output display module of embodiment 4

Figure 5 is a schematic block diagram of the anti-surge impact protection circuit in Embodiment 5

Fig. 6 is a functional block diagram of the soft-start protection circuit of Embodiment 5

Detailed ways

In conjunction with the accompanying drawings, the specific structure of each part of the circuit of the present invention is described. In each embodiment, the preferred parameters of each circuit element are marked in brackets after the element.

Embodiment 1 illustrates the overall structure of the present invention in conjunction with the accompanying drawings

The power consumption balanced high-power constant current source of the present invention has a structure: a voltage control module 1, an output display module 2, a transconductance amplifier 3, and a safety protection circuit module 4. The structural block diagram is shown in Figure 1, wherein the voltage control module 1 The output port V _C is connected to the transconductance amplifier 3, and the required constant current signal is generated by the transconductance amplifier 3 to drive the load 5. The safety protection circuit module 4 provides safety protection for the load. At the same time, the output port V _A of the voltage control module 1 and the output port V _F of the transconductance amplifier module 3 is connected to the mode selection input terminal of the output display module 2, and the output display module 2 displays the current limit value and the actual current value.

Embodiment 2 Voltage Control Module 1

As shown in Figure 2, the voltage control module 1 includes: pin 1 of the voltage reference chip U1 (MC1403) is connected to the power supply VCC1 (+15V, rated power 30W), pin 3 is grounded, and pin 2 is connected to a single op amp through a resistor R1 (15kΩ) Pin 3 of U2 (OP07), pin 4 of single op amp U2 (OP07) is grounded, pin 7 is connected to power supply VCC1 (+15V, rated power 30W), pin 2 is grounded through resistor R3 (30kΩ), single op amp U2 (OP07) ) through the resistor R2 (30kΩ) to the 6-pin of the single op amp U2 (OP07), and the 6-pin of the single op-amp U2 (OP07) to the 3-pin of the potentiometer R _p1 (100kΩ), and the potentiometer R _p1 (100kΩ ) pin 1 is grounded, pin 2 is connected to the output port V _A of the voltage control module 1, and the output port V _A is connected to the mode selection input terminal of the output display module 2, while the potentiometer R _p1 (100kΩ) pin 2 passes through the resistor R4 ( 10kΩ) to pin 3 of single op amp U3 (OP07), pin 4 of single op amp U3 (OP07) to ground, pin 7 to power supply VCC1 (+15V, rated power 30W), pin 2 to 6 through resistor R5 (10kΩ) Pin 6 is connected to pin 3 of the potentiometer R _p2 (100kΩ), pin 1 of the potentiometer R _p2 (100kΩ) is grounded, and pin 2 is connected to the output port V _C of the voltage control module 1.

Embodiment 3 Transconductance amplifier 3

As shown in Figure 3, the transconductance amplifier 3 includes: the 4-pin of the dual operational amplifier U4A (LM358) is grounded, the 8-pin is connected to the power supply VCC1 (+15V, rated power 30W), and the 2-pin is connected to the voltage control module through a resistor R6 (10kΩ) The output port V _C of 1 is connected to the control signal output port of the soft start protection circuit in the safety protection circuit module 4, and the pin 3 is connected to the output port V _F of the transconductance amplifier 3 through a resistor R7 (10kΩ), and the dual operational amplifier U4A (LM358) Pin 3 of the dual op amp U4A (LM358) is connected to pin 1 of the dual op amp U4A (LM358) through a capacitor C1 (4.7μF), and pin 1 of the dual op amp U4A (LM358) is connected to an N-type Darlington power transistor T _E (TIP132) through a resistor R8 (1kΩ). ), the 3rd pin of the N-type Darlington power transistor _TE (TIP132) is connected to the power supply VCC1 (+15V, rated power 30W), the 2nd pin is grounded through the resistor R9 (1kΩ), and the 2nd pin is respectively connected to 12 Precision resistors R _b1 ~ R _b12 with the same parameters (100Ω) are connected to pin 1 of 12 N-channel bipolar junction power transistors T1 ~ T12 of the same model (2N3055), and N-channel bipolar junction power transistors T1 ~ The 3 pins of each transistor in T12 are connected together, connected to the negative pole of the load 5 (which can be a high-power laser diode array, with a rated current of 50 amps), and the positive pole of the load 5 is connected to the power supply VCC2 (+12V, rated power 1000W). The pin 2 of each transistor in the N-channel bipolar junction power transistors T1~T12 is grounded through a precision resistor in the precision resistor array R _e1 ~R _en (both are 0.1Ω precision sampling resistors), and the N-channel dual The 2 pins of each transistor in the pole junction power transistors T1 ~ T12 are respectively connected to the 5 pins of the dual operational amplifier U4B (LM358) through a resistor in the resistor array R _a1 ~ R _a12 (the value of each resistor is 10k). Pin, pin 5 of the dual op amp U4B (LM358) is grounded through resistor R10 (10kΩ), pin 6 is grounded through resistor R11 (10kΩ), pin 6 is connected to pin 7 through resistor R12 (10kΩ), and pin 7 is connected to transconductance amplifier 3 The output port V _F of the output port V _F is connected to the mode selection input end of the output display module 2 . Since the transconductance amplifier 3 uses 12 power transistors of the same type to drive the load in parallel, the maximum output current is greatly increased, up to 50 amperes in the present invention, and the reliability of the instrument is improved at the same time.

Embodiment 4 output display module

As shown in Figure 4, the output display module 2 is composed of mode selection and LED display connected sequentially. The mode selection has two input terminals, which are respectively used to connect the output port V _A of the voltage control module 1 and the output of the transconductance amplifier 3. Port V _F , the signal to be displayed is selected by the mode selection and sent to the LED display to display the limited current value and the actual current value.

Embodiment 5 Safety protection circuit module

The safety protection circuit module 4 includes anti-surge protection and soft-start protection:

As shown in Figure 5, the anti-surge circuit includes an RC charging circuit composed of a resistor R13 (200kΩ) and a capacitor C2 (1μF), an N-channel enhanced field effect transistor Q1 (2skl458), and a normally closed solid-state relay . The gate of FET Q1 (2skl458) is connected to resistor R13 (200kΩ) and capacitor C2 (1μF), the other end of capacitor C2 (1μF) is grounded, the drain of FET Q1 is connected to the relay, and the drain of FET Q1 Source ground. The two normally closed ends of the relay are connected in parallel with the two ends of the load.

As shown in Figure 6, the soft-start circuit includes a PNP transistor T1 (9012), an RC discharge circuit composed of a resistor R15 (20kΩ) and a capacitor C3 (1μF), and an N-channel enhanced field effect transistor Q2 ( 2skl458). Among them, the gate of the field effect transistor Q2 (2skl458) is connected to the resistor R15 (20kΩ) and the capacitor C3 (1μF), and the other end of the resistor R15 (20kΩ) and the other end of the capacitor C3 (1μF) are grounded; the field effect transistor Q2 (2skl458 ) as a control signal is connected to the input terminal of the transconductance amplifier, and is connected to the output terminal V _C of the voltage control module 1, the source of the field effect transistor Q2 (2skl458) is grounded; the base of the triode T1 (9012) passes through The resistor R14 (2MΩ) is connected to the control switch, the emitter of the transistor T1 (9012) is connected to the power supply VCC1, and the collector of the transistor T1 (9012) is connected to the gate of the field effect transistor Q2 (2skl458).

Claims (1)

1. A 50 ampere power consumption balanced high-power constant current source, its structure has an output display module (2), a safety protection circuit module (4); its feature is that the structure also has a voltage control module (1) and a transconductance Amplifier (3); wherein, the output terminal of the anti-surge protection circuit of the safety protection circuit module (4) is connected to the load (5); the control signal output port of the soft-start protection circuit of the safety protection circuit module (4) is connected to the transconductance amplifier (3) Connection; the output port V _A of the voltage control module (1) and the output port V _F of the transconductance amplifier (3) are respectively connected to the two input terminals of the mode selection of the output display module (2), and the output display module (2) Displaying the current limit value and the actual current value; the output port V _C of the voltage control module (1) is connected to the transconductance amplifier (3), and the output terminal of the transconductance amplifier (3) is connected to the load (5); The voltage control module (1) includes: pin 1 of the voltage reference chip U1 is connected to the power supply VCC1, pin 3 is grounded, pin 2 is connected to pin 3 of the single op amp U2 through a resistor R1, pin 4 of the single op amp U2 is grounded, 7 The pin is connected to the power supply VCC1, the 2 pin is grounded through the resistor R3, the 2 pin of the single op amp U2 is connected to the 6 pin of the single op amp U2 through the resistor R2, the 6 pin of the single op amp U2 is connected to the 3 pin of the potentiometer R _p1 , and the potentiometer R Pin 1 of _p1 is grounded, pin 2 is used as the output port V _A of the voltage control module (1), and the output port V _A is connected to an input terminal of the mode selection of the output display module (2), while the potentiometer R _p1 pin 2 passes through a resistor R4 is connected to pin 3 of single op amp U3, pin 4 of single op amp U3 is grounded, pin 7 is connected to power supply VCC1, pin 2 is connected to pin 6 of single op amp U3 through resistor R5, pin 6 of single op amp U3 is connected to potentiometer R Pin 3 of _p2 , pin 1 of potentiometer R _p2 is grounded, and pin 2 is used as the output port V _C of the voltage control module (1); The transconductance amplifier (3) includes: pin 4 of the dual operational amplifier U4A is grounded, pin 8 is connected to the power supply VCC1, pin 2 is connected to the output port V _C of the voltage control module (1) through a resistor R6, and pin 3 is connected to the output port of the voltage control module (1) through a resistor R7. Pin 7 of dual op amp U4B, and pin 3 of dual op amp U4A is connected to pin 1 of dual op amp U4A through capacitor C1, and pin 1 of dual op amp U4A is connected to pin 1 of N-type Darlington power transistor T _E through resistor R8 Pin 3 of the N-type Darlington power transistor T _E is connected to the power supply VCC1, pin 2 is grounded through the resistor R9, and pin 2 is also connected to a pin of each resistor in a group of precision resistors R _b1 ~ R _bn with the same parameters The other pins of each resistor in the precision resistors R _b1 ~ R _bn are respectively connected to pin 1 of a transistor in a group of N-channel bipolar junction power transistors T1 ~ Tn of the same model, and the N-channel bipolar junction power transistors The 3 pins of each transistor in the power transistors T1~Tn are connected together, and connected to the negative pole of the load (5), the positive pole of the load (5) is connected to the power supply VCC2, and each of the N-channel bipolar junction power transistors T1~Tn The 2 pins of each transistor are respectively grounded through one of a group of precision power resistors R _e1 ~ R _en with the same parameters, and at the same time, the 2 pins of each transistor in the N-channel bipolar junction power transistors T1 ~ Tn are respectively connected through a One of the resistors R _a1 to R _an with the same group parameters is connected to pin 5 of the dual op amp U4B, pin 5 of the dual op amp U4B is grounded through the resistor R10, pin 6 is grounded through the resistor R11, and pin 6 of the dual op amp U4B is connected to the ground through the resistor R11. Connect the pin 7 of the dual operational amplifier U4B through the resistor R12, the pin 7 of the dual operational amplifier U4B is used as the output port V _F of the transconductance amplifier (3), and the output port V _F is connected to another input of the mode selection of the output display module (2) end; The model of voltage reference chip U1 used in the voltage control module (1) is MC1403, the models of single op amp U2 and single op amp U3 are Op07, the value of resistor R1 is 15kΩ, and the values of resistor R2 and resistor R3 are Both are 30kΩ, the values of resistor R4 and resistor R5 are both 10kΩ, the values of potentiometer R _P1 and potentiometer R _P2 are both 100kΩ, the power supply VCC1 is 15V, and the rated power is 30W; The dual operational amplifiers U4A and U4B used in the transconductance amplifier (3) are both integrated dual operational amplifiers LM358, the N-type Darlington power transistor _TE model is TIP132, and the value of the capacitor C1 is 4.7 μF , the number of N-channel bipolar junction power transistors T1~Tn is 12, the model is 2N3055, the resistance values of resistor R6 and resistor R7 are both 10kΩ, the resistance values of resistor R8 and resistor R9 are both 1kΩ, and the resistance value of resistor R10 The resistance values of ~resistors R12 are all 10kΩ, the number of resistors R _a1 ~R _an is 12, and the resistance value is 10kΩ, the number of resistors R _b1 ~R _bn is 12, and the resistance value is 100Ω, The number of precision power resistors R _e1 ~ R _en is 12, and the resistance value is 0.1Ω. The power supply VCC1 is 15V, and the rated power is 30W. The power supply VCC2 is 12V, and the rated power is 1000W.

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