CN211577263U

CN211577263U - Current detection circuit

Info

Publication number: CN211577263U
Application number: CN202020049416.3U
Authority: CN
Inventors: 钟荣
Original assignee: Ace Plastics Shenzhen Co Ltd
Current assignee: Ace Plastics Shenzhen Co Ltd
Priority date: 2020-01-09
Filing date: 2020-01-09
Publication date: 2020-09-25
Anticipated expiration: 2030-01-09

Abstract

The utility model relates to a technical field of point gum machine especially relates to a current detection circuit, and it includes switch module, current sensor, enlargies subassembly and power supply module, switching element is used for receiving the control signal and the output switch signal of CPU output, 1 foot, 2 feet of current sensor are coupled in switch module, 3 feet, 4 feet are coupled in the bulb, another termination zero line of bulb, current sensor responds to switch signal with output current signal, it is coupled in current sensor and is used for enlargiing current signal to enlarge the subassembly to the current signal after will enlargiing conveys in the CPU, power supply module supplies power to switch module. The utility model discloses have and occupy small, the integrated level is high, and can effectively reduce the loss, reduce thermal effect.

Description

Current detection circuit

Technical Field

The utility model relates to a point gum machine technical field especially relates to a current detection circuit.

Background

At present, an automatic glue dispenser is professional equipment for replacing manual glue dispensing, and the influence in the industry is wide. In industrial production, dispensing is required in many places, such as semiconductor packages, integrated circuits, and the like. On an industrial production line, in order to enable the dispensing process of the automatic dispenser to be quicker, a bulb is arranged on a dispensing device, and when the glue drops on the surface of a product, the bulb is used for baking the glue on the surface of the product, so that the glue can quickly reach a solidification state. In order to control the heat emitted by the bulb, the current value of the resistance wire of the bulb is obtained by using a current detection device, the current detection device is coupled with a CPU, and the CPU controls and feeds back the received current value to the bulb, so that the brightness of the bulb can be indirectly controlled.

In the prior art, a current detection device is a resistance sampling mode, as shown in fig. 1, a flyback converter circuit needs to sample a current Id in a primary winding N1 of an isolation transformer T, a sampling resistor Rcs is connected in series to a current sampling point, the current Id of the sampling point flows through the sampling resistor Rcs, a voltage Vcs is generated on the sampling resistor Rcs, the voltage Vcs is proportional to an actual current Id, Vcs is Id Rcs, the voltage Vcs on the sampling resistor Rcs represents a signal of the actual current Id, the amplitude is proportional to Id, and a proportionality coefficient is a resistance value of the sampling resistor Rcs.

The above prior art solutions have the following drawbacks: the transformer has a large volume, which results in a large amount of heat dissipation, and thus the temperature of the surrounding environment and other devices is increased, which adversely affects the overall heat dissipation and temperature rise. In addition, the transformer is large in size, so that the transformer cannot be applied to narrow environments, such as a washing machine control panel, and accordingly the application range of the transformer is narrow.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a current detection circuit, solve the in-process device heat dissipation capacity of current detection more, influence other device temperature rising's problem.

The above object of the present invention can be achieved by the following technical solutions:

a current detection circuit comprises a switch component, a current sensor, an amplification component and a power supply component, wherein the switch component is used for receiving a control signal output by a CPU and outputting a switch signal,

pins

1 and 2 of the current sensor are coupled to the switch component,

pins

3 and 4 of the current sensor are coupled to a bulb, the other end of the bulb is connected with a zero line, the current sensor responds to the switch signal to output a current signal, the amplification component is coupled to the current sensor and used for amplifying the current signal and transmitting the amplified current signal into the CPU, and the power supply component supplies power to the switch component.

Adopt above-mentioned technical scheme, when CPU control switch subassembly starts, current sensor begins to detect the electric current in the bulb, and can be with the current signal transmission who detects to the amplification subassembly, the amplification subassembly receives the back, amplify current signal, and send to in the CPU, thereby make things convenient for the degree of generating heat of CPU control bulb, the contrast adopts the transformer to come indirect detection current's mode, adopt current sensor, can effectively reduce the volume of device, thereby be convenient for install, more importantly, current sensor volume is little a lot less than the transformer, the heat that its produced is also few, and then make the heat that current sensor produced can not cause the interference to other devices to the very big degree, thereby can make things convenient for bulb current detection's process.

The utility model discloses further set up to: the power supply assembly comprises low-voltage direct current and 220V alternating current, the direct current supplies power to the switching element, the current sensor and the amplifying assembly, the alternating current is matched with the direct current and is electrically isolated through the switching element, and the live wire of the alternating current is coupled with the switching assembly.

By adopting the technical scheme, the switching element, the alternating current and the direct current are matched with each other, the direct current with low voltage can be utilized to indirectly control the alternating current to work on the current sensor through the switching element, and therefore when the CPU controls the switching component to be started, the output signal of the switching component has no influence on the input signal.

The utility model discloses further set up to: the switch assembly comprises a photoelectric coupler and a controlled silicon, the photoelectric coupler is MOC3041 in model, pin 1 of the photoelectric coupler is coupled to direct current, pin 2 is controlled by a control end of a CPU, pin 6 is coupled to a live wire of alternating current, pin 4 is coupled to a gate pole of the controlled silicon, a first main electrode of the controlled silicon is coupled to the live wire, and a second main electrode of the controlled silicon is coupled to a current sensor.

By adopting the technical scheme, the photoelectric coupler has an isolation effect, and can realize unidirectional transmission of signals due to unidirectional transmission of the photoelectric coupler, so that the input end and the output end are completely electrically isolated, the output signals have no influence on the input end, the anti-interference capability is strong, and the work is stable; the optical coupler is photoelectric, so that the service life is long, and the defect that a mechanical contact has the suction times is overcome. The silicon controlled rectifier that sets up is used as contactless switch, and when optoelectronic coupler during operation, the silicon controlled rectifier switches on, and at this moment, the live wire is connected on the bulb through current sensor, and then the current sensor of being convenient for detects the electric current on the bulb.

The utility model discloses further set up to: the current sensor is characterized in that

pins

1 and 2 are coupled to a second main electrode of the controllable silicon, pins 3 are coupled to pins 4 of the current sensor, pins 4 of the current sensor are coupled to a bulb, the other end of the bulb is coupled to a zero line, pins 7 of the current sensor are coupled to the amplifying assembly, and pins 8 of the current sensor are coupled to direct current and pins 5 are grounded.

By adopting the technical scheme, the current sensor has the advantages of high precision, good linearity, wide frequency band, quick response, strong overload capacity, no loss of energy of a measured circuit and the like, and is convenient for detecting and controlling the current on the bulb.

The utility model discloses further set up to: 8 pins of the current sensor are grounded through a capacitor C9, and 6 pins of the current sensor are grounded through a capacitor C10.

By adopting the technical scheme, the capacitors C9 and C10 play roles in filtering and removing interference, so that the stability and accuracy of output signals are improved conveniently.

The utility model discloses further set up to: the amplifying assembly comprises a first amplifier and a second amplifier, wherein the first amplifier is coupled to a pin 7 of the current sensor and used for amplifying the detected current signal and transmitting the amplified current signal to the second amplifier, and the second amplifier is used for receiving the current signal amplified by the first amplifier, amplifying the current signal again and transmitting the amplified current signal to the control end of the CPU.

By adopting the technical scheme, the first amplifier and the second amplifier are matched with each other, so that the current signal output by the current sensor can be amplified and then amplified, and the output current swing is large, thereby being convenient for receiving and feedback control of a CPU.

The utility model discloses further set up to: the output end of the second amplifier is coupled with a capacitor C13, and the other end of the capacitor C13 is grounded.

By adopting the technical scheme, the arranged capacitor C13 can block direct current from passing through and only allows alternating current signals to pass through, so that stable current waveforms are obtained.

The utility model discloses further set up to: an indicator light LED2 is arranged between the pin 1 of the photoelectric coupler and the direct current, and when the photoelectric coupler works, the indicator light LED2 is on.

Adopt above-mentioned technical scheme, the pilot lamp LED2 that sets up plays the effect of instructing, can reflect that optoelectronic coupler is in operating condition.

To sum up, the utility model discloses a beneficial technological effect does:

1. through power module, the silicon controlled rectifier, photoelectric coupler, current sensor, mutually supporting of first amplifier and second amplifier, can utilize the very convenient size of detection control bulb internal current of current sensor, the contrast adopts the transformer to come indirect detection current's mode, adopt current sensor, can effectively reduce the volume of device, thereby be convenient for install, and simultaneously, current sensor volume is little a lot less than the transformer, the heat that its produced is also few, and then can not cause the interference to other devices in making the heat that current sensor produced to the very big degree, thereby can make things convenient for bulb current detection's process.

2. The photoelectric coupler has the isolation function, and the unidirectional transmission of signals can be realized because the photoelectric coupler is in unidirectional transmission, so that the input end and the output end are completely electrically isolated, the output signals have no influence on the input end, the anti-interference capability is strong, and the work is stable; the optical coupler is photoelectric, so that the service life is long, and the defect that a mechanical contact has the suction times is overcome. The silicon controlled rectifier that sets up is used as contactless switch, and when optoelectronic coupler during operation, the silicon controlled rectifier switches on, and at this moment, the live wire is connected on the bulb through current sensor, and then the current sensor of being convenient for detects the electric current on the bulb.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the optoelectronic coupler and the current sensor of the present invention;

fig. 2 is a schematic circuit diagram of the first amplifier and the second amplifier of the present invention.

Reference numerals: 1. a photoelectric coupler; 2. silicon controlled rectifier; 3. a current sensor; 4. a first amplifier; 5. a second amplifier; 6. a bulb.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

A current detection circuit is disclosed, as shown in fig. 1 and 2, and comprises a switch component, a current sensor 3, an amplifying component and a power supply component, wherein the power supply component supplies power to the switch element, the current sensor 3 and the amplifying component, the switch component is controlled by a CPU, when the CPU outputs a control signal to enter the switch component, the switch component is conducted and outputs a switch signal,

pins

1 and 2 of the current sensor 3 are coupled with the switch component,

pins

3 and 4 of the current sensor 3 are coupled with a bulb 6, the other end of the bulb 6 is coupled with a zero line, when the current sensor 3 receives the switch signal, the bulb 6 is electrified, at the moment, the current sensor 3 detects current in the bulb 6 and outputs a current signal to the amplifying component, and the amplifying component is coupled with the current sensor 3 and used for amplifying the current signal.

The power supply assembly comprises low-voltage 5V direct current and 220V alternating current, the 5V direct current is coupled with an indicator light LED2, the indicator light LED2 is a light emitting diode, the anode of the light emitting diode is coupled with the direct current, the cathode of the light emitting diode is coupled with a resistor R5, the other end of the resistor R5 is coupled with the switch assembly, the switch element comprises a photoelectric coupler 1 and a controlled silicon 2, the photoelectric coupler 1 is MOC3041 in model, the controlled silicon 2 is BT137 in model, a pin 1 of the photoelectric coupler 1 is coupled with a resistor R5, the other end of the resistor R5 is coupled with the direct current, a pin 2 of the photoelectric coupler 1 is controlled by a control end of a CPU, a pin 6 is coupled with a resistor R6, the other end of the resistor R6 is coupled with a live wire of the alternating current, a pin 4 is coupled with a gate of the controlled silicon 2.

The pin 2 of the current sensor 3 is coupled to the pin 1 of the current sensor 3, the pin 3 of the current sensor 3 is coupled to the pin 4 of the current sensor 3, the pin 4 of the current sensor 3 is coupled to the bulb 6, the other end of the bulb 6 is coupled to a zero line, and when the current sensor 3 detects the current of the bulb 6, a current signal is output from the pin 7 of the current sensor 3. In addition, the 8-pin of the current sensor 3 is coupled to dc, and a capacitor C9 is coupled to the 8-pin of the current sensor 3, the 6-pin of the current sensor 3 is grounded through a capacitor C10, and the 5-pin is grounded.

The amplifying assembly comprises a first amplifier 4 and a second amplifier 5, the types of the first amplifier 4 and the second amplifier 5 are both LM358, the first amplifier 4 is coupled to the 7 pins of the current sensor 3, and is used for amplifying the detected current signal and transmitting the amplified current signal to the second amplifier 5, specifically, the inverting terminal of the first amplifier 4 is coupled to the 7 pins of the current sensor 3 through a resistor R7, the non-inverting terminal is coupled with direct current through a resistor R8, a resistor R9 is further coupled between the non-inverting terminal and the resistor R8, and the other end of the resistor R9 is grounded. A resistor R10 is connected to the inverting terminal and the output terminal of the first amplifier 4, and a capacitor C11 is connected in parallel to the resistor R10.

The second amplifier 5 is coupled to the output terminal of the first amplifier 4 through a resistor R11, the second amplifier 5 is configured to receive the current signal amplified by the first amplifier 4, amplify the current signal again, and transmit the amplified current signal to the control terminal of the CPU, the non-inverting terminal of the second amplifier 5 is coupled to the dc through a resistor R12, the inverting terminal of the second amplifier 5 is connected to the output terminal of the second amplifier 5 through a wire, the power supply terminal of the second amplifier 5 is coupled to the dc and grounded through a capacitor C12, the 4-pin of the second amplifier 5 is grounded, the output terminal of the second amplifier 5 is coupled to the control terminal of the CPU through a resistor R13, the output terminal of the second amplifier 5 is coupled to a capacitor C13, and the other terminal of the capacitor C13 is grounded.

The implementation principle is as follows: when a control signal output by the CPU enters a pin 2 of the photoelectric coupler 1, the photoelectric coupler 1 is conducted, an indicator light LED2 is conducted and emits light, after the photoelectric coupler 1 is conducted, a controllable silicon 2 is conducted, at the moment, a live wire is connected to a pin 1 of a current sensor 3 through the controllable silicon 2, a bulb 6 connected to a pin 4 of the current sensor 3 is lighted, at the moment, the current sensor 3 detects the current of the bulb 6 and transmits the detected current signal to an inverting terminal of a first amplifier 4 through a pin 7, at the moment, the first amplifier 4 amplifies the current signal, the amplified current signal enters a non-inverting terminal of a second amplifier 5 through an output terminal of the first amplifier 4, at the moment, the current signal is amplified again through the second amplifier 5, and finally the current signal amplified to a proper multiple is transmitted to the CPU, so that the CPU monitors and adjusts the received current signal, thereby realizing the brightness adjustment of the bulb 6.

Through this mode, can utilize the very convenient size of detection control bulb 6 internal current of current sensor 3, the contrast adopts the transformer to come the indirect mode that detects the electric current, adopt current sensor 3, can effectively reduce the volume of device, be convenient for installation and dismantlement, and simultaneously, 3 small ratio transformers of current sensor are little, the heat of its production is also few, and then can not cause the interference to other devices in making the heat that current sensor 3 produced to the very big degree, thereby can make things convenient for the process that bulb 6 electric current detected.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The current detection circuit is characterized by comprising a switch element, a current sensor (3), an amplification assembly and a power supply assembly, wherein the switch element is used for receiving a control signal output by a CPU and outputting a switch signal, pins 1 and 2 of the current sensor (3) are coupled to the switch assembly, pins 3 and 4 of the switch assembly are coupled to a bulb (6), the other end of the bulb (6) is connected with a zero line, the current sensor (3) responds to the switch signal to output a current signal, the amplification assembly is coupled to the current sensor (3) and used for amplifying the current signal and transmitting the amplified current signal into the CPU, and the power supply assembly supplies power to the switch assembly.

2. A current detection circuit according to claim 1, wherein the power supply assembly comprises a low voltage dc power supply for the switching element, the current sensor (3) and the amplifying assembly, and a 220V ac power supply for matching the dc power supply and for electrically isolating the switching element, the live line of the ac power supply being coupled to the switching assembly.

3. The current detection circuit according to claim 2, wherein the switch assembly comprises a photoelectric coupler (1) and a thyristor (2), the photoelectric coupler (1) is of a model of MOC3041, a pin 1 of the photoelectric coupler (1) is coupled to direct current, a pin 2 is controlled by a control terminal of a CPU, a pin 6 is coupled to a live wire of alternating current, a pin 4 is coupled to a gate electrode of the thyristor (2), and a first main electrode of the thyristor (2) is coupled to the live wire and a second main electrode of the thyristor (2) is coupled to the current sensor (3).

4. A current detection circuit according to claim 3, wherein the 1 pin and the 2 pin of the current sensor (3) are coupled to the second main electrode of the thyristor (2), the 3 pin of the current sensor (3) is coupled to the 4 pin of the current sensor (3), the 4 pin of the current sensor (3) is coupled to the light bulb (6), the other end of the light bulb (6) is coupled to the zero line, the 7 pin of the current sensor (3) is coupled to the amplifying component, the 8 pin of the current sensor (3) is coupled to the direct current, and the 5 pin is grounded.

5. A current detection circuit according to claim 4, characterized in that 8 pins of the current sensor (3) are connected to ground via a capacitor C9, and 6 pins of the current sensor (3) are connected to ground via a capacitor C10.

6. A current detection circuit according to claim 1, wherein the amplifying component comprises a first amplifier (4) and a second amplifier (5), the first amplifier (4) is coupled to the 7-pin of the current sensor (3) for amplifying the detected current signal and transmitting the amplified current signal to the second amplifier (5), and the second amplifier (5) is configured for receiving the current signal amplified by the first amplifier (4), re-amplifying the current signal and transmitting the amplified current signal to the control terminal of the CPU.

7. A current detection circuit according to claim 6, wherein a capacitor C13 is coupled to the output of the second amplifier (5), and the other end of the capacitor C13 is connected to ground.

8. A current detection circuit according to claim 3, characterized in that an indicator light LED2 is provided between pin 1 of the photoelectric coupler (1) and the direct current, and when the photoelectric coupler (1) is in operation, the indicator light LED2 is on.