A voltage detection circuit

Abstract

The utility model discloses a voltage detection circuit belongs to voltage detection field. Including: for the full bridge inverter module of direct current signal inverse into high frequency square wave signal, voltage conversion, electrical isolation's voltage isolation module for high frequency square wave signal is carried out, voltage feedback module for the feedback output end voltage, the full bridge inverter module, voltage isolation module, matching network module, output module, voltage feedback module are connected in proper order. Compared with prior art, the voltage of output end is fed back through the combination of the two groups of coil windings of transformer T1 and inductance L1, which can realize the isolation between the load output and the feedback end, and does not need to add an independent feedback transformer for isolation detection, does not need to divide voltage detection through resistance, capacitor, can simplify the circuit, improves the stability of circuit.

Description

Technical Field

[0001] This utility model belongs to the field of voltage detection, and specifically relates to a voltage detection circuit. Background Technology

[0002] In the ultrasonic welding process, the output voltage of the ultrasonic power supply needs to be isolated and tested to ensure the stable operation of the welding equipment.

[0003] Existing voltage detection circuits either use an additional independent feedback transformer for isolation detection or use resistors and capacitors for voltage division detection, which cannot achieve isolation between the output and the feedback. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this invention is to provide a voltage detection circuit that simplifies the circuit and improves its stability.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] This utility model provides a voltage detection circuit, including:

[0007] A full-bridge inverter module used to invert DC signals into high-frequency square wave signals;

[0008] A transformer isolation module used for voltage transformation and electrical isolation of high-frequency square wave signals;

[0009] Matching network module used for filtering and boosting high-frequency square wave signals;

[0010] Output module used to connect the load;

[0011] A voltage feedback module used to provide feedback on the output voltage;

[0012] The full-bridge inverter module, transformer isolation module, matching network module, output module, and voltage feedback module are connected in sequence.

[0013] Furthermore, the full-bridge inverter module includes transistors Q2, Q3, Q4, and Q5 connected in parallel. One terminal of each transistor is connected to the DC signal input from the control unit, and the other terminal is connected to the transformer isolation module.

[0014] Furthermore, the transformer isolation module includes a transformer T1, which includes:

[0015] The first primary winding N1 is used to receive high-frequency square wave signals;

[0016] The secondary winding N3 is used to transform the output signal.

[0017] The first primary winding N1 is magnetically coupled to the secondary winding N3, and the first primary winding N1 is connected to transistors Q2, Q3, Q4, and Q5, while the secondary winding N3 is connected to the matching network module.

[0018] Furthermore, the matching network module includes an inductor L1 and a capacitor C72. The inductor L1 includes a second primary winding N1, one end of which is connected to the secondary winding N3, and the other end is connected to the capacitor C72. The output module includes a positive terminal Y+ and a negative terminal Y-, which are respectively connected to the two ends of the capacitor C72.

[0019] Furthermore, the transformer T1 also includes a primary winding N2, and the inductor L1 also includes a secondary winding N2. The primary winding N2 is magnetically coupled to the first primary winding N1, and the secondary winding N2 is magnetically coupled to the second primary winding N1.

[0020] Furthermore, the voltage feedback module includes: the primary winding N2, the secondary winding N2, capacitor C70, capacitor C71, resistor R44, resistor R45, resistor R46, and resistor R47. The primary winding N2 is connected to the secondary winding N2. The secondary winding N2, capacitor C70, and resistor R44 are interconnected. Resistors R44, R45, R46, and R47 are connected in sequence. Resistor R47, capacitor C71, and primary winding N2 are interconnected. Capacitors C70 and C71 are connected.

[0021] The beneficial effects of this utility model are as follows: Compared with the prior art, by combining the two sets of coil windings of transformer T1 and inductor L1 to feed back the voltage at the output terminal, it is possible to achieve isolation between the load output and the feedback terminal, without the need for an additional independent feedback transformer for isolation detection, and without the need for voltage division detection through resistors and capacitors, which simplifies the circuit and improves the stability of the circuit. Attached Figure Description

[0022] Figure 1 This is a block diagram of a voltage detection circuit.

[0023] Figure 2 This is the circuit diagram of a voltage detection circuit.

[0024] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0025] Figure 4 yes Figure 2 A magnified view of a section at point B in the middle.

[0026] Figure 5 yes Figure 2 A magnified view of a section at point C. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] To achieve the above objectives, the technical solution of this utility model is as follows:

[0029] See Figure 1-5 As shown, this embodiment provides a voltage detection circuit, including:

[0030] A full-bridge inverter module used to invert DC signals into high-frequency square wave signals;

[0031] A transformer isolation module used for voltage transformation and electrical isolation of high-frequency square wave signals;

[0032] Matching network module used for filtering and boosting high-frequency square wave signals;

[0033] Output module used to connect the load;

[0034] A voltage feedback module used to provide feedback on the output voltage;

[0035] The full-bridge inverter module, transformer isolation module, matching network module, output module, and voltage feedback module are connected in sequence.

[0036] In this application, the signal of the inverter circuit is sent by the control unit of the ultrasonic welding equipment, converted into a high-frequency square wave signal by the full-bridge inverter module, amplified by power, isolated and transformed by the transformer isolation module, filtered by the matching network module, and finally boosted and output to the load. The voltage feedback module can feed back the voltage output by the output module to the load to the control unit, thereby realizing the detection of the output voltage.

[0037] Furthermore, the full-bridge inverter module includes transistors Q2, Q3, Q4, and Q5 connected in parallel. One terminal of each transistor is connected to the DC signal input from the control unit, and the other terminal is connected to the transformer isolation module. Transistors Q2, Q3, Q4, and Q5 can invert the DC signal input from the control unit into a 20kHz high-frequency square wave signal.

[0038] Furthermore, the transformer isolation module includes a transformer T1, which includes:

[0039] The first primary winding N1 is used to receive high-frequency square wave signals;

[0040] The secondary winding N3 is used to transform the output signal.

[0041] The first primary winding N1 is magnetically coupled to the secondary winding N3, and the first primary winding N1 is connected to transistors Q2, Q3, Q4, and Q5, while the secondary winding N3 is connected to the matching network module.

[0042] In this application, the transformer T1, through the cooperation of windings N1-N3, enables the received high-frequency square wave signal to be output to the matching network module after transformer isolation.

[0043] Furthermore, the matching network module includes an inductor L1 and a capacitor C72. The inductor L1 includes a second primary winding N1, one end of which is connected to the secondary winding N3, and the other end is connected to the capacitor C72. The output module includes a positive terminal Y+ and a negative terminal Y-, which are respectively connected to the two ends of the capacitor C72.

[0044] In this application, after receiving the voltage signal input from the secondary winding N3, the second primary winding N1 of inductor L1 is filtered and boosted by capacitor C72, and then output to the load through the positive terminal Y+ and the negative terminal Y- to provide power to the load of ultrasonic welding.

[0045] Furthermore, the transformer T1 also includes a primary winding N2, and the inductor L1 also includes a secondary winding N2. The primary winding N2 is magnetically coupled to the first primary winding N1, and the secondary winding N2 is magnetically coupled to the second primary winding N1.

[0046] Furthermore, the voltage feedback module includes: the primary winding N2, the secondary winding N2, capacitor C70, capacitor C71, resistor R44, resistor R45, resistor R46, and resistor R47. The primary winding N2 is connected to the secondary winding N2. The secondary winding N2, capacitor C70, and resistor R44 are interconnected. Resistors R44, R45, R46, and R47 are connected in sequence. Resistor R47, capacitor C71, and primary winding N2 are interconnected. Capacitors C70 and C71 are connected.

[0047] In this application, the primary winding N2 of transformer T1 and the secondary winding N2 of inductor L1 are combined to form a feedback circuit. The load output voltage is fed back through the secondary winding N3 of transformer T1 and the second primary winding N1 of inductor L1, which can realize the isolation between the load output and the feedback terminal. Capacitors C70 and C71 are used to reduce the impedance of the feedback signal loop and provide a DC reference potential for the feedback signal. Resistors R44, R45, R46, and R47 form a step-down unit to step down the feedback voltage and then feed it back to the control unit to realize the detection of the output voltage.

[0048] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A voltage detection circuit, characterized in that, include: A full-bridge inverter module used to invert DC signals into high-frequency square wave signals; A transformer isolation module used for voltage transformation and electrical isolation of high-frequency square wave signals; Matching network module used for filtering and boosting high-frequency square wave signals; Output module used to connect the load; A voltage feedback module used to provide feedback on the output voltage; The full-bridge inverter module, transformer isolation module, matching network module, output module, and voltage feedback module are connected in sequence.

2. The voltage detection circuit as described in claim 1, characterized in that, The full-bridge inverter module includes transistors Q2, Q3, Q4, and Q5 connected in parallel. One terminal of each transistor is connected to the DC signal input from the control unit, and the other terminal is connected to the transformer isolation module.

3. A voltage detection circuit as described in claim 2, characterized in that, The transformer isolation module includes a transformer T1, and the transformer T1 includes: The first primary winding N1 is used to receive high-frequency square wave signals; The secondary winding N3 is used to transform the output signal. The first primary winding N1 is magnetically coupled to the secondary winding N3, and the first primary winding N1 is connected to transistors Q2, Q3, Q4, and Q5, while the secondary winding N3 is connected to the matching network module.

4. A voltage detection circuit as described in claim 3, characterized in that, The matching network module includes an inductor L1 and a capacitor C72. The inductor L1 includes a second primary winding N1. One end of the second primary winding N1 is connected to the secondary winding N3, and the other end is connected to the capacitor C72. The output module includes a positive terminal Y+ and a negative terminal Y-. The positive terminal Y+ and the negative terminal Y- are respectively connected to the two ends of the capacitor C72.

5. A voltage detection circuit as described in claim 4, characterized in that, The transformer T1 further includes a primary winding N2, and the inductor L1 further includes a secondary winding N2. The primary winding N2 is magnetically coupled to the first primary winding N1, and the secondary winding N2 is magnetically coupled to the second primary winding N1.

6. A voltage detection circuit as described in claim 5, characterized in that, The voltage feedback module includes: a primary winding N2, a secondary winding N2, a capacitor C70, a capacitor C71, a resistor R44, a resistor R45, a resistor R46, and a resistor R47. The primary winding N2 is connected to the secondary winding N2. The secondary winding N2, capacitor C70, and resistor R44 are interconnected. Resistors R44, R45, R46, and R47 are connected in sequence. Resistor R47, capacitor C71, and primary winding N2 are interconnected. Capacitors C70 and C71 are connected.

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