High-voltage pulse short-circuit protection circuit

Abstract

The invention discloses a high-voltage pulse short-circuit protection circuit, which belongs to the field of pulse ablatograph protection circuits, and comprises a short-circuit detection loop, an amplification circuit, a driving signal turn-off loop, an energy control loop and a peak voltage absorption loop, the other end of the amplifying circuit is connected with the control end of the pulse ablatograph; one end of the driving signal turn-off loop is connected with the control end of the pulse ablatograph, and the other end of the driving signal turn-off loop is connected with the short circuit detection loop; one end of the energy control loop is connected with the short circuit detection loop, and the other end of the energy control loop is connected with a bus BUS + of the pulse ablation instrument; and the peak voltage absorption loop is connected with the energy control loop. The protection circuit has the functions of short-circuit detection, automatic turn-off of driving signals, short-circuit energy control and peak voltage absorption. The short-circuit protection circuit is simple in structure, realizes short-circuit protection by using a pure hardware circuit, and has the characteristics of high response speed, stability and reliability.

Description

Technical Field

[0001] The invention relates to the field of pulse ablation instrument protection circuits, in particular to a high-voltage pulse short-circuit protection circuit. Background Art

[0002] The pulse ablation device is an innovative medical device that combines mechanical, electronic and software technologies, and is specifically used for electric field ablation therapy. Its working principle is to release high-intensity pulse energy to the diseased tissue through special electrodes. These pulses are emitted at microsecond or nanosecond intervals, which can produce irreversible tiny perforations on the diseased cells. This treatment method can effectively remove the lesions and cure the disease, and it has the advantages of minimally invasive, convenient and few side effects. Specifically, the pulse ablation technology generates an instantaneous high-intensity electric field, which causes the instantaneous rupture of the cell membrane, thereby achieving precise treatment of the diseased tissue. This method not only improves the safety and effectiveness of the treatment, but also shortens the patient's recovery time. The pulse ablation device is suitable for a variety of medical applications, especially in tumors, heart disease and other fields that require local ablation therapy. The main components of the pulse ablation device include energy storage capacitors, switch tubes and drive circuits. Since these components need to handle high-intensity pulse energy during treatment, it is crucial to ensure their safety during design and operation.

[0003] If the pulse ablation instrument is working without proper protection measures, the circuit load is prone to short circuit, which may cause extremely high energy release in an instant. Excessive energy release may cause capacitors, switch tubes and other components to overheat or be damaged, thus affecting the normal function of the device. Damaged components may cause the pulse ablation instrument to fail to work properly, thereby delaying treatment time and causing unnecessary pain to patients. The energy release caused by the short circuit may cause the internal components of the device to explode, produce splashes and debris, and pose a safety hazard to operators and patients. The sound produced by the explosion may scare doctors and patients and affect the treatment environment. Therefore, in the design and use of the pulse ablation instrument, appropriate short-circuit protection measures must be taken to ensure the safe and reliable operation of the equipment and minimize potential risks. This not only guarantees the performance of medical equipment, but also maintains the safety of patients and medical staff.

[0004] The existing protection circuit of the pulse ablation device cannot achieve the peak voltage absorption function well, the overall circuit design structure is relatively complex, the response speed is slow, and the stability is poor, which affects the safety of the use of the pulse ablation device. Summary of the invention

[0005] With regard to the above problems existing in the prior art, the object of the present invention is to provide a high voltage pulse short circuit protection circuit to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A high-voltage pulse short-circuit protection circuit includes a short-circuit detection circuit, an amplifying circuit, a driving signal shutoff circuit, an energy control circuit and a peak voltage absorption circuit. The short-circuit detection circuit includes a low-pass filter detection IGBT module T1, a resistor R4 and a capacitor C4. The gate of the low-pass filter detection IGBT module T1 is connected to one end of the amplifying circuit, and the other end of the amplifying circuit is connected to the control end of the pulse ablation instrument.

[0008] The driving signal shutdown loop includes a gate circuit U1 and a MOS tube Q3; one end of the driving signal shutdown loop is connected to the control end of the pulse ablation instrument, and the other end of the driving signal shutdown loop is connected to the short circuit detection loop;

[0009] The energy control loop includes energy storage capacitor C1, energy storage capacitor C2 and inductor L1, one end of the energy control loop is connected to the short circuit detection loop, and the other end of the energy control loop is connected to the bus BUS+ of the pulse ablation instrument;

[0010] The peak voltage absorption circuit includes a resistor R2, a capacitor C3 and a diode D1, and the peak voltage absorption circuit is connected to the energy control circuit.

[0011] As a further solution of the present invention: the collector of the low-pass filter detection IGBT module T1 in the short-circuit detection loop is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the A end of the capacitor C4, and the B end of the capacitor C4 is grounded;

[0012] The low-pass filter in the short-circuit detection loop detects that the emitter of the IGBT module T1 is grounded.

[0013] As a further solution of the present invention: the short-circuit detection circuit is used for performing short-circuit detection.

[0014] As a further solution of the present invention: the amplifying circuit comprises a transistor Q1 and a transistor Q2; the gate of the transistor Q1 and the gate of the transistor Q2 are simultaneously connected to the control end of the pulse ablation instrument, the collector of the transistor Q1 is connected to the reference voltage; the reference voltage is +5V; the collector of the transistor Q2 is grounded;

[0015] The emitter of the transistor Q1 and the emitter of the transistor Q2 are connected to one end of the resistor R3 at the same time, and the other end of the resistor R3 is connected to the gate of the low-pass filter detection IGBT module T1 in the short-circuit detection loop.

[0016] As a further solution of the present invention: one input end of the gate circuit U1 in the drive signal shutoff loop is connected to the control end of the pulse ablation device, and the other input end of the gate circuit U1 in the drive signal shutoff loop is connected to the A end of the capacitor C4 in the short circuit detection loop;

[0017] The output end of the gate circuit U1 is connected to the gate of the MOS tube Q3, the source of the MOS tube Q3 is grounded; the drain of the MOS tube Q3 is connected to the control end of the pulse ablation instrument.

[0018] As a further solution of the present invention: the drive signal shutoff circuit is used to automatically shut off the drive signal after a short circuit.

[0019] As a further solution of the present invention: one end of the inductor L1 in the energy control loop is connected to the bus BUS+ of the pulse ablation device, the other end of the inductor L1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the collector of the low-pass filter detection IGBT module T1 in the short-circuit detection loop;

[0020] The positive electrode of the energy storage capacitor C1 in the energy control loop is connected to one end of the inductor L1; the negative electrode of the energy storage capacitor C1 is grounded;

[0021] The positive electrode of the energy storage capacitor C2 in the energy control loop is connected to the other end of the inductor L1; the negative electrode of the energy storage capacitor C2 is grounded.

[0022] As a further solution of the present invention: the energy control loop is used for controlling short-circuit energy.

[0023] As a further solution of the present invention: the positive electrode of the diode D1 in the peak voltage absorption circuit is connected to the positive electrode of the energy storage capacitor C2 in the energy control circuit, the negative electrode of the diode D1 is connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the positive electrode of the energy storage capacitor C1 in the energy control circuit;

[0024] The resistor R2 is connected in parallel to both ends of the capacitor C3.

[0025] As a further solution of the present invention: the peak voltage absorption circuit is used for absorbing the peak voltage.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The protection circuit of the present invention has a short-circuit detection function composed of a resistor and a capacitor; a function of automatically shutting off the driving signal after a short circuit composed of an AND gate circuit and a MOS tube; a short-circuit energy control function composed of two capacitors and an inductor; and a peak voltage absorption function composed of a resistor, a capacitor, and a diode. When the load is short-circuited, the IGBT protection device is turned off to prevent the machine from exploding, and after the driving signal is turned off, the RCD absorption circuit is used to prevent the generated peak voltage from damaging the device. The overall design structure of the protection circuit of the present invention is simple, and short-circuit protection is achieved using a pure hardware circuit, which has the characteristics of fast response speed, stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The present invention is a circuit diagram of a high-voltage pulse short-circuit protection circuit disclosed in an embodiment. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", and "connected" should be understood in a broad sense; for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, or an electrical connection, a direct connection, or an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The present invention provides an innovative circuit solution, including a short-circuit detection circuit, a drive signal shutdown circuit, an energy control circuit, and a peak voltage absorption circuit, which work together to realize a short-circuit protection function.

[0032] See also Figure 1 A high-voltage pulse short-circuit protection circuit includes a short-circuit detection circuit, an amplifying circuit, a driving signal shutoff circuit, an energy control circuit and a spike voltage absorption circuit. The short-circuit detection circuit, the amplifying circuit, the driving signal shutoff circuit, the energy control circuit and the spike voltage absorption circuit work together to realize the short-circuit protection function.

[0033] The short-circuit detection circuit includes a low-pass filter detection IGBT module T1, a resistor R4 and a capacitor C4. The gate of the low-pass filter detection IGBT module T1 is connected to one end of the amplifier circuit, and the other end of the amplifier circuit is connected to the control end of the pulse ablation device. The control end of the pulse ablation device transmits the control signal to the amplifier circuit, and the signal amplified by the amplifier circuit is transmitted to the short-circuit detection circuit. The short-circuit detection circuit performs short-circuit detection on it to ensure the safety of the overall operation of the pulse ablation device.

[0034] The drive signal shutdown circuit includes a gate circuit U1 and a MOS tube Q3; one end of the drive signal shutdown circuit is connected to the control end of the pulse ablation device, and the other end of the drive signal shutdown circuit is connected to the short circuit detection circuit; the drive signal shutdown circuit has the function of automatically shutting down the drive signal after a short circuit by adding the AND gate circuit U1 and the MOS tube Q3.

[0035] The energy control circuit includes energy storage capacitors C1, C2 and inductor L1. One end of the energy control circuit is connected to the short-circuit detection circuit, and the other end of the energy control circuit is connected to the bus BUS+ of the pulse ablation device. The energy control circuit has a short-circuit energy control function by adding two energy storage capacitors C1, C2 and inductor L1.

[0036] The peak voltage absorption circuit includes a resistor R2, a capacitor C3 and a diode D1, and the peak voltage absorption circuit is connected to the energy control circuit; the peak voltage absorption circuit forms an RCD absorption circuit by adding a resistor R2, a capacitor C3 and a diode D1, and has a peak voltage absorption function.

[0037] like Figure 1 As shown, the collector of the low-pass filter detection IGBT module T1 in the short-circuit detection loop is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the A end of the capacitor C4, and the B end of the capacitor C4 is grounded;

[0038] The low-pass filter in the short-circuit detection circuit detects the emitter grounding of the IGBT module T1;

[0039] A low-pass filter is formed by resistor R4 and capacitor C4 to detect the collector voltage of IGBT (T1). When a short-circuit fault occurs in the load after the IGBT is turned on, the current increases rapidly, so that the voltage at point C increases, generating a short-circuit overcurrent signal, and the interference glitch signal in the circuit will be eliminated by the low-pass filter.

[0040] The amplifier circuit includes a transistor Q1 and a transistor Q2; the gate of the transistor Q1 and the gate of the transistor Q2 are connected to the control end of the pulse ablation instrument at the same time, the collector of the transistor Q1 is connected to the reference voltage; the reference voltage is +5V; the collector of the transistor Q2 is grounded;

[0041] The emitter of transistor Q1 and the emitter of transistor Q2 are connected to one end of resistor R3 at the same time, and the other end of resistor R3 is connected to the gate of low-pass filter detection IGBT module T1 in the short-circuit detection loop;

[0042] One input end of the gate circuit U1 in the driving signal shutoff loop is connected to the control end of the pulse ablation device, and the other input end of the gate circuit U1 in the driving signal shutoff loop is connected to the A end of the capacitor C4 in the short-circuit detection loop;

[0043] The output end of the gate circuit U1 is connected to the gate of the MOS tube Q3, the source of the MOS tube Q3 is grounded; the drain of the MOS tube Q3 is connected to the control end of the pulse ablation instrument;

[0044] By adding the AND gate circuit U1, when the drive signal and the short-circuit overcurrent signal are both at high levels, the AND gate circuit outputs a high level. The high level signal output by the AND gate circuit turns on the MOS tube Q3, and pulls the drive signal low to turn off the IGBT output.

[0045] One end of the inductor L1 in the energy control loop is connected to the bus BUS+ of the pulse ablation device, the other end of the inductor L1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the collector of the low-pass filter detection IGBT module T1 in the short-circuit detection loop;

[0046] The positive electrode of the energy storage capacitor C1 in the energy control loop is connected to one end of the inductor L1; the negative electrode of the energy storage capacitor C1 is grounded;

[0047] The positive electrode of the energy storage capacitor C2 in the energy control loop is connected to the other end of the inductor L1; the negative electrode of the energy storage capacitor C2 is grounded;

[0048] By adding two energy storage capacitors C1 and C2 and inductor L1, the capacity of capacitor C1 is large and the capacity of capacitor C2 is small. In normal operation, capacitor C1 charges capacitor C2 through the inductor. At the moment when load R1 is short-circuited, the current on the inductor cannot change suddenly. Only the electricity on capacitor C2 will be released instantly, and the energy on capacitor C1 will not be released immediately, thus ensuring that IGBT (T1) will not be blown up by the instantaneous short-circuit energy.

[0049] The positive electrode of the diode D1 in the peak voltage absorption loop is connected to the positive electrode of the energy storage capacitor C2 in the energy control loop, the negative electrode of the diode D1 is connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the positive electrode of the energy storage capacitor C1 in the energy control loop;

[0050] The resistor R2 is connected in parallel across the capacitor C3;

[0051] The RCD absorption circuit is formed by adding resistor R2, capacitor C3 and diode D1. When the short circuit fault is triggered and the IGBT (T1) is turned off, a spike voltage will be generated on the inductor. The RCD absorption circuit can effectively absorb the spike voltage generated on the inductor, thereby protecting the IGBT (T1) from being damaged by the spike voltage.

[0052] The short-circuit detection circuit, the drive signal shut-off circuit, the energy control circuit, and the peak voltage absorption circuit work simultaneously, ensuring that the IGBT (T1) is not affected by the short circuit.

[0053] The technical features of this short-circuit protection circuit are: a short-circuit detection function composed of resistors and capacitors; a function of automatically shutting down the drive signal after a short circuit composed of an AND gate circuit and a MOS tube; a short-circuit energy control function composed of two capacitors and an inductor; and a peak voltage absorption function composed of resistors, capacitors and diodes.

[0054] The technical problems solved by the short-circuit protection circuit include shutting down the IGBT protection device to prevent it from blowing up when the load is short-circuited, and preventing the generated peak voltage from damaging the device through the RCD absorption circuit after shutting down the drive signal.

[0055] The overall design structure of the short-circuit protection circuit is simple, and short-circuit protection is achieved by using a pure hardware circuit, which has the characteristics of fast response speed, stability and reliability.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive from any point of view. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention, and any reference numerals in the claims should not be considered as limiting the claims involved.

[0057] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high voltage pulse short circuit protection circuit, characterized in that: It includes a short-circuit detection circuit, an amplifying circuit, a driving signal shutoff circuit, an energy control circuit and a peak voltage absorption circuit. The short-circuit detection circuit includes a low-pass filter detection IGBT module T1, a resistor R4 and a capacitor C4. The gate of the low-pass filter detection IGBT module T1 is connected to one end of the amplifying circuit, and the other end of the amplifying circuit is connected to the control end of the pulse ablation instrument. The driving signal shutdown loop includes a gate circuit U1 and a MOS tube Q3; one end of the driving signal shutdown loop is connected to the control end of the pulse ablation instrument, and the other end of the driving signal shutdown loop is connected to the short circuit detection loop; The energy control loop includes energy storage capacitor C1, energy storage capacitor C2 and inductor L1, one end of the energy control loop is connected to the short circuit detection loop, and the other end of the energy control loop is connected to the bus BUS+ of the pulse ablation instrument; The peak voltage absorption circuit includes a resistor R2, a capacitor C3 and a diode D1, and the peak voltage absorption circuit is connected to the energy control circuit.

2. A high voltage pulse short circuit protection circuit according to claim 1, characterized in that: The collector of the low-pass filter detection IGBT module T1 in the short-circuit detection loop is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the A end of the capacitor C4, and the B end of the capacitor C4 is grounded; The low-pass filter in the short-circuit detection loop detects that the emitter of the IGBT module T1 is grounded.

3. A high voltage pulse short circuit protection circuit according to claim 1, characterized in that: The short circuit detection circuit is used for performing short circuit detection.

4. A high voltage pulse short circuit protection circuit according to claim 1, characterized in that: The amplifying circuit includes a transistor Q1 and a transistor Q2; the gate of the transistor Q1 and the gate of the transistor Q2 are connected to the control end of the pulse ablation instrument at the same time, the collector of the transistor Q1 is connected to the reference voltage; the reference voltage is +5V; the collector of the transistor Q2 is grounded; The emitter of the transistor Q1 and the emitter of the transistor Q2 are connected to one end of the resistor R3 at the same time, and the other end of the resistor R3 is connected to the gate of the low-pass filter detection IGBT module T1 in the short-circuit detection loop.

5. A high voltage pulse short circuit protection circuit according to claim 1, characterized in that: One input end of the gate circuit U1 in the driving signal shutoff loop is connected to the control end of the pulse ablation device, and the other input end of the gate circuit U1 in the driving signal shutoff loop is connected to the A end of the capacitor C4 in the short-circuit detection loop; The output end of the gate circuit U1 is connected to the gate of the MOS tube Q3, the source of the MOS tube Q3 is grounded; the drain of the MOS tube Q3 is connected to the control end of the pulse ablation instrument.

6. A high voltage pulse short circuit protection circuit according to claim 1, characterized in that: The drive signal shutoff circuit is used to automatically shut off the drive signal after a short circuit.

7. A high voltage pulse short circuit protection circuit according to claim 1, characterized in that: One end of the inductor L1 in the energy control loop is connected to the bus BUS+ of the pulse ablation device, the other end of the inductor L1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the collector of the low-pass filter detection IGBT module T1 in the short-circuit detection loop; The positive electrode of the energy storage capacitor C1 in the energy control loop is connected to one end of the inductor L1; the negative electrode of the energy storage capacitor C1 is grounded; The positive electrode of the energy storage capacitor C2 in the energy control loop is connected to the other end of the inductor L1; the negative electrode of the energy storage capacitor C2 is grounded.

8. A high voltage pulse short circuit protection circuit according to claim 1, characterized in that: The energy control loop is used for controlling short-circuit energy.

9. A high voltage pulse short circuit protection circuit according to claim 1, characterized in that: The positive electrode of the diode D1 in the peak voltage absorption circuit is connected to the positive electrode of the energy storage capacitor C2 in the energy control circuit, the negative electrode of the diode D1 is connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the positive electrode of the energy storage capacitor C1 in the energy control circuit; The resistor R2 is connected in parallel to both ends of the capacitor C3.

10. A high voltage pulse short circuit protection circuit according to claim 1, characterized in that: The peak voltage absorption circuit is used for absorbing the peak voltage.

Images