An on-line threshold adjustable AC voltage doubler trigger circuit with impedance isolation

Abstract

This invention discloses a voltage multiplier trigger circuit with operational amplifier buffer isolation and potentiometer stepless voltage adjustment, belonging to the field of power frequency AC voltage multiplier trigger power supply technology. It aims to solve the problems of fixed threshold voltage, significant voltage divider load effect, poor voltage regulation linearity, and non-adjustable trigger parameters in traditional voltage multiplier trigger circuits. The circuit includes an AC voltage multiplier main circuit, an impedance-isolated buffered voltage divider sampling loop, a closed-loop voltage regulation control module, a trigger pulse generation module, and a thyristor output drive module. This invention completely eliminates the load effect of the voltage divider network by configuring the operational amplifier as a voltage follower; it achieves online continuous adjustment of the voltage multiplier output voltage using a single high-voltage linear potentiometer, and the trigger frequency changes synchronously with the output voltage. The voltage regulation linearity error of this invention is reduced to within 3%, the adjustable output voltage range is 20V to 155V, and the corresponding adjustable trigger frequency range is 2.8kHz to 17.2kHz, significantly improving the circuit's versatility, stability, and ease of debugging. It is suitable for various industrial and civilian scenarios such as AC voltage regulation, lighting triggering, and small high-voltage pulse driving.

Description

Technical Field

[0001] This invention relates to the field of power frequency AC boost and SCR pulse trigger power supply technology, specifically to a voltage doubler rectifier trigger circuit with an online continuously adjustable voltage regulation threshold. This circuit, through operational amplifier impedance isolation buffering and a single potentiometer closed-loop voltage regulation architecture, solves the inherent defects of traditional voltage doubler trigger circuits, such as fixed threshold, significant voltage divider load effect, poor adjustment linearity, and non-adjustable trigger parameters. It is suitable for power supplies for industrial and civilian electrical appliances, including AC voltage regulation, lighting triggering, small high-voltage pulse drives, and bidirectional SCR phase control. Background Technology

[0002] Existing conventional voltage divider trigger circuits have the following main drawbacks: First, the fixed voltage divider ratio makes the output threshold unchangeable. When the input mains voltage fluctuates significantly, the high-voltage output amplitude deviates severely, easily causing overvoltage damage to the components. Second, the feedback sampling terminal is directly connected to the reference chip, and the voltage divider network and the reference input form a load coupling. When the load is disturbed, the sampling voltage is easily distorted, resulting in large high-voltage fluctuations and disordered trigger pulses. Third, the parameters of the traditional RC-DB3 trigger structure are fixed at the factory, and the output trigger frequency cannot adapt to changes in the high-voltage voltage. After the load is changed, problems such as failure to oscillate or thyristor mis-triggering are very likely to occur. Fourth, the reference sampling circuit lacks a buffer isolation design, and line noise and high-voltage spikes can easily enter the control loop, resulting in weak anti-interference capability of the circuit. To address the above problems, this invention proposes a voltage doubler trigger circuit with operational amplifier buffer isolation and single potentiometer continuous voltage adjustment, which effectively optimizes the voltage adjustment linearity and improves trigger stability and adaptability to operating conditions. Summary of the Invention

[0003] This invention provides a voltage doubler trigger circuit with operational amplifier buffer isolation and potentiometer stepless voltage adjustment, which solves the problems of poor voltage regulation linearity, fixed trigger parameters, and large sampling load interference in traditional voltage doubler trigger circuits. At the same time, it provides an implementation scheme for this type of online adjustable voltage doubler trigger power supply, effectively improving trigger stability and operating condition adaptability.

[0004] like Figure 1The technical solution of the present invention is as follows: a voltage multiplier trigger circuit with operational amplifier buffer isolation and potentiometer stepless voltage adjustment, characterized in that its AC voltage multiplier main circuit includes: an AC input live wire terminal (AC / L) and a neutral wire terminal (AC / N), a rectifier diode (DO1), a current-limiting resistor (R02), and an energy storage capacitor (CO3). The anode of the rectifier diode DO1 is connected to the AC input terminal AC / L, the cathode of the rectifier diode DO1 is connected to one end of the current-limiting resistor R02, the other end of the current-limiting resistor R02 is connected to the positive terminal of the energy storage capacitor CO3, and the negative terminal of the energy storage capacitor CO3 is connected to the AC input neutral wire terminal AC / N. The negative terminal connected to the energy storage capacitor CO3 is a through-hole aluminum electrolytic capacitor, realizing the superposition and voltage multiplication of positive and negative half-cycle charges of the power frequency AC.

[0005] The voltage multiplier trigger circuit with operational amplifier buffer isolation and potentiometer stepless voltage adjustment is characterized by an impedance-isolated threshold voltage divider sampling loop: a high-voltage linear potentiometer (RP1), an auxiliary compensation capacitor (C01), an operational amplifier U1, an isolation diode (DO2), and a current-limiting resistor (R01), used to acquire the high-voltage bus voltage divider signal and thereby change the threshold. The upper end of potentiometer RP1 is connected to the AC input live wire terminal (AC / L), and the lower end of potentiometer RP1 is connected to the AC input neutral wire terminal (AC / N). The sliding tap of potentiometer RP1 is connected to the non-inverting input terminal of the operational amplifier. One end of the auxiliary compensation capacitor C01 is connected to the non-inverting input terminal of the operational amplifier, and the other end of the auxiliary compensation capacitor C01 is connected to the AC input neutral wire terminal AC / N, filtering out voltage adjustment glitches. The inverting input terminal of the operational amplifier is connected to the output of the operational amplifier, forming a voltage follower. The operational amplifier is connected to the cathode of the isolation diode DO2. The anode of the isolation diode D02 shown is connected to one end of the current-limiting resistor R01. The other end of the current-limiting resistor is connected to the reference pin of the TL431.

[0006] The voltage doubler trigger circuit described above, featuring operational amplifier buffer isolation and potentiometer stepless voltage adjustment, is characterized by its closed-loop voltage regulation based on a TL431 built-in 2.5V reference and a high-voltage linear potentiometer for voltage division. The regulated output formula is as follows: RP1 总 RP1 represents the total resistance of the potentiometer. 下 This represents the resistance between the slider and ground. The voltage division ratio is changed in real time by rotating the potentiometer, continuously correcting the high-voltage regulation threshold, such as... Figure 2 As shown.

[0007] The voltage multiplier trigger circuit with operational amplifier buffer isolation and potentiometer stepless voltage adjustment is characterized by a closed-loop voltage regulator module: TL431 (U2), clamping diodes (D03, D04), a protection resistor (R03), and a compensation capacitor (C02). The anode of the TL431 is connected to the AC input neutral terminal AC / N, and the cathode of the TL431 is connected to the cathode of the clamping diode D04. The anode of the clamping diode D04 is connected to the AC input neutral terminal AC / N, and the cathode of the clamping diode D04 is connected to one end of the protection resistor R03. The other end of the protection resistor R03 is connected to the anode of the clamping diode D03. The cathode of the clamping diode D03 is connected to the positive terminal of the energy storage capacitor C03. One end of the compensation capacitor C02 is connected to the reference pin of the TL431, and the other end of the compensation capacitor C02 is connected to the AC input live terminal (AC / L), used for phase compensation of the voltage regulation loop to suppress self-oscillation across the entire load range. The linearity error of the potentiometer's full-stroke voltage adjustment is reduced to within 3%, such as... Figure 3 As shown.

[0008] The voltage doubler trigger circuit described above, featuring operational amplifier buffer isolation and potentiometer stepless voltage adjustment, is characterized by a trigger voltage linkage adjustment design: the trigger threshold changes synchronously with the bus voltage, and the trigger charging time formula is as follows:

[0009]

[0010] Where R 04 It is the resistance value of trigger resistor R04, C 04 Yes, the capacitance value, V. HV It is the regulated output voltage, V DB The conduction voltage of the bidirectional trigger diode Q1 is used to achieve a linkage between the high voltage and the trigger frequency, forming a curve showing the change of the trigger pulse period with the voltage multiplier output voltage. Figure 4 ) and the curve of trigger pulse frequency versus voltage multiplier output voltage ( Figure 5 ).

[0011] The voltage multiplier trigger circuit with operational amplifier buffer isolation and potentiometer stepless voltage adjustment is characterized by a thyristor output drive circuit comprising: a bidirectional trigger diode (Q1), a bleed resistor (R05), a trigger resistor (R04), a trigger capacitor (C04), a bidirectional thyristor (Q2), and an output terminal (OUT). One end of the trigger resistor R4 is connected to the AC input live wire terminal (AC / L), and the other end of the trigger resistor R4 is connected to one end of the trigger capacitor C04 and one end of the bidirectional trigger diode Q1. The other end of the trigger capacitor C04 is connected to the AC input neutral wire terminal AC / N. The other end of the bidirectional trigger diode Q1 is connected to one end of the bleed resistor R05 and the control terminal of the bidirectional thyristor. The other end of the bleed resistor R05 is connected to the AC input neutral wire terminal AC / N. One end of the main electrode of the bidirectional thyristor Q2 is connected to the AC input neutral wire terminal AC / N, and the other end of the main electrode of the bidirectional thyristor Q2 is connected to the output terminal OUT.

[0012] The voltage doubler trigger circuit with operational amplifier buffer isolation and potentiometer stepless voltage adjustment is characterized in that the trigger capacitor C04 is charged to the breakdown voltage of the bidirectional trigger diode Q1 and outputs a pulse, which controls the on / off state of the circuit by the trigger pulse.

[0013] The present invention has the following beneficial effects:

[0014] 1) This invention relies on the isolation voltage divider load effect of the operational amplifier follower to reduce the linearity error of the potentiometer's full-stroke voltage regulation to within 3%, eliminating the voltage regulation dead zone;

[0015] 2) This invention allows for continuous online adjustment of the voltage multiplier threshold and trigger frequency with a single knob, eliminating the need to replace components and significantly improving component versatility. The adjustable voltage multiplier threshold range is 40V to 155V, the corresponding adjustable trigger pulse period range is 58μs to 354μs, and the trigger frequency can be continuously adjusted within the range of 2.8KHz to 17.2KHz.

[0016] 3) With the addition of a multi-stage clamping and isolation structure, the high-voltage surge backflow failure rate is significantly reduced, and the trigger jitter amplitude is significantly reduced under all temperature range conditions. Attached Figure Description

[0017] Figure 1 This is the circuit schematic diagram of the present invention;

[0018] Figure 2 The output voltage of this invention varies with the voltage division ratio (horizontal axis: potentiometer voltage division ratio k, vertical axis: voltage multiplier output voltage V). HV (V));

[0019] Figure 3A graph comparing the voltage regulation error of the conventional circuit and the present invention (horizontal axis: voltage multiplier output voltage V) HV (V), Vertical axis: Voltage regulation relative error (%);

[0020] Figure 4 The graph shows the change in the trigger pulse period as a function of the output voltage (horizontal axis: voltage multiplier output voltage V). HV (V), vertical axis: trigger period T(μs);

[0021] Figure 5 The graph shows the change in trigger pulse frequency as a function of output voltage (horizontal axis: voltage multiplier output voltage V). HV (V), vertical axis: trigger frequency f(kHz); Detailed Implementation

[0022] The present invention will now be further described in conjunction with the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention in a schematic manner, and therefore only show the components relevant to the invention.

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] Implementation Examples

[0025] 1. Component selection and parameters

[0026] The rectifier diodes D01, D03, and D04 are RS2M fast recovery diodes (reverse withstand voltage 1000V, forward average current 2A, reverse recovery time <50ns).

[0027] The isolation diode D02 is an RS2M fast recovery diode (reverse withstand voltage 1000V, forward average current 2A, reverse recovery time <50ns).

[0028] Operational amplifier U1 is an LM358 (1MHz bandwidth, 0.6V / μs slew rate, single power supply).

[0029] The precision reference regulator U2 is a TL431CLPG (reference voltage 2.5V, regulation accuracy ±0.4%, operating current range 1mA~100mA).

[0030] The bidirectional trigger diode Q1 is selected as DB3TG (breakover voltage 28-36V, typical value 32V, peak pulse current 50mA).

[0031] The bidirectional thyristor Q2 is selected as BT139-800E (rated withstand voltage 800V, on-state current 12A, off-state leakage current <1μA).

[0032] The high-voltage linear potentiometer RP1 is a 100kΩ high-voltage insulated shaft potentiometer (rated power 1W, rated withstand voltage 400V, linear accuracy ±0.5%).

[0033] The energy storage capacitor C03 is a 4.7μF / 160V aluminum electrolytic capacitor (temperature range -40℃~+105℃, leakage current <10μA).

[0034] The trigger capacitor C04 is a 0.022μF / 200V ceramic capacitor (capacitance accuracy ±5%, low high-frequency loss).

[0035] The filter compensation capacitors C01 and C02 are 0.1μF / 100V ceramic capacitors (capacitance accuracy ±10%, used to suppress high-frequency interference and loop compensation).

[0036] The current-limiting protection resistor R01 is a 220kΩ metal film resistor (power 1 / 4W, accuracy ±1%, temperature drift ±25ppm / ℃).

[0037] The current-limiting protection resistor R02 is a 22kΩ metal film resistor (power 1 / 4W, accuracy ±1%, temperature drift ±25ppm / ℃).

[0038] The current-limiting protection resistor R03 is a 200Ω metal film resistor (power 1 / 4W, accuracy ±1%, temperature drift ±25ppm / ℃).

[0039] The charging resistor R04 is a 10kΩ metal film resistor (power 1 / 4W, accuracy ±1%, temperature drift ±25ppm / ℃).

[0040] The bleeder resistor R05 is a 475Ω metal film resistor (power 1 / 4W, accuracy ±1%, temperature drift ±25ppm / ℃).

[0041] 2. Parameter Calculation

[0042] Adjustable output voltage range of voltage multiplier regulator:

[0043] TL431 reference voltage V REF =2.5V, total resistance of potentiometer RP1 总 =100kΩ

[0044] The theoretical maximum threshold (with the slider at the top, the potentiometer slider resistance to ground approaches 0, clamped by C03 withstand voltage) Due to the actual voltage withstand capability of CO3 (4.7μF / 160V), after taking a safety margin: V HV(max) ≈155V

[0045] Minimum threshold (slider at the bottom, RP1) 下 =RP1 总 ) In practical applications, due to the trigger threshold limitation of the bidirectional trigger diode DB3TG, the lower limit of the effective trigger output is set to 40V.

[0046] Voltage multiplier threshold adjustable range: 40V~155V (continuously stepless adjustable)

[0047] Trigger period and frequency of bidirectional trigger diode Q1:

[0048] Triggering the lower limit

[0049]

[0050] Trigger Limit

[0051]

[0052] Adjustable trigger period: approximately 58μs to 354μs; Adjustable trigger frequency: approximately 2.8kHz to 17.2kHz.

[0053] 3. Circuit connection

[0054] like Figure 1 As shown, a voltage doubler trigger circuit with operational amplifier buffer isolation and potentiometer stepless voltage adjustment is presented.

[0055] The anode of the rectifier diode D01 in the AC voltage multiplier main circuit module is connected to the AC input live wire terminal AC / L. The cathode of the rectifier diode D01 in the AC voltage multiplier main circuit module is connected to one end of the current-limiting resistor R02. The other end of the current-limiting resistor R02 in the AC voltage multiplier main circuit module is connected to the positive terminal of the energy storage capacitor C03. The negative terminal of the energy storage capacitor C03 in the AC voltage multiplier main circuit module is connected to the AC input neutral wire terminal AC / N. This achieves voltage multiplication by superimposing the positive and negative half-cycle charges of the power frequency AC, generating a high-voltage DC bus voltage.

[0056] The upper end of the high-voltage linear potentiometer RP1 of the impedance isolation buffer voltage divider sampling module is connected to the AC input live wire terminal AC / L. The lower end of the high-voltage linear potentiometer RP1 of the impedance isolation buffer voltage divider sampling module is connected to the AC input neutral wire terminal AC / N. The sliding tap of the high-voltage linear potentiometer RP1 of the impedance isolation buffer voltage divider sampling module is connected to the non-inverting input terminal of the operational amplifier U1. One end of the auxiliary compensation capacitor C01 of the impedance isolation buffer voltage divider sampling module is connected to the non-inverting input terminal of the operational amplifier U1. The other end of the auxiliary compensation capacitor C01 of the impedance isolation buffer voltage divider sampling module is connected to the AC input neutral wire terminal AC / N. The inverting input terminal of the operational amplifier U1 of the impedance isolation buffer voltage divider sampling module is connected to the output terminal of the operational amplifier U1. The output terminal of the operational amplifier U1 of the impedance isolation buffer voltage divider sampling module is connected to the cathode of the isolation diode D02. The anode of the isolation diode D02 in the impedance isolation buffer voltage divider sampling module is connected to one end of the current-limiting resistor R01. The other end of the current-limiting resistor R01 in the impedance isolation buffer voltage divider sampling module is connected to the reference pin of the TL431 in the closed-loop voltage regulation control module. This achieves high impedance isolation and low impedance drive of the high-voltage bus voltage divider signal, eliminates sampling load effects, and filters out voltage regulation glitches.

[0057] The anode of the TL431 U2 in the closed-loop voltage regulator control module is connected to the AC input neutral terminal AC / N. The cathode of the TL431 U2 in the closed-loop voltage regulator control module is connected to the cathode of the clamping diode D04. The anode of the clamping diode D04 in the closed-loop voltage regulator control module is connected to the AC input neutral terminal AC / N. The cathode of the clamping diode D04 in the closed-loop voltage regulator control module is connected to one end of the protection resistor R03. The other end of the protection resistor R03 in the closed-loop voltage regulator control module is connected to the anode of the clamping diode D03. The cathode of the clamping diode D03 in the closed-loop voltage regulator control module is connected to the positive terminal of the energy storage capacitor C03. One end of the compensation capacitor C02 in the closed-loop voltage regulator control module is connected to the reference pin of the TL431 U2. The other end of the compensation capacitor C02 in the closed-loop voltage regulator control module is connected to the AC input neutral terminal AC / N. A closed-loop voltage regulator is built based on the TL431's built-in 2.5V reference. The voltage division ratio is changed in real time by rotating the potentiometer, continuously correcting the high voltage regulation threshold. At the same time, phase compensation of the voltage regulation loop is achieved to suppress self-excited oscillation across the entire load range.

[0058] One end of the trigger resistor R04 of the trigger pulse generation module is connected to the positive terminal of the energy storage capacitor C03. The other end of the trigger resistor R04 of the trigger pulse generation module is connected to one end of the trigger capacitor C04 and one end of the bidirectional trigger diode Q1, respectively. The other end of the trigger capacitor C04 of the trigger pulse generation module is connected to the AC input neutral terminal AC / N. The other end of the bidirectional trigger diode Q1 of the trigger pulse generation module is connected to one end of the bleed resistor R05 and the control terminal of the bidirectional thyristor Q2 of the thyristor output drive module, respectively. The other end of the bleed resistor R05 of the trigger pulse generation module is connected to the AC input neutral terminal AC / N. The trigger charging time is jointly determined by the trigger resistor, the capacitance value of the trigger capacitor, the regulated output voltage, and the conduction voltage of the bidirectional trigger diode, realizing that the trigger threshold changes synchronously with the bus voltage, and the high voltage and trigger frequency are linked for adjustment.

[0059] One end of the main electrode of the bidirectional thyristor Q2 in the thyristor output driver module is connected to the AC input neutral terminal AC / N. The other end of the main electrode of the bidirectional thyristor Q2 in the thyristor output driver module is connected to the output terminal OUT. AC output control is achieved by controlling the on / off state of the circuit using a trigger pulse.

[0060] A voltage multiplier trigger circuit with operational amplifier buffer isolation and potentiometer stepless voltage adjustment includes an AC voltage multiplier main circuit, an impedance-isolated buffered voltage divider sampling loop, a closed-loop voltage regulation control module, a trigger pulse generation module, and a thyristor output drive module. The voltage divider signal from the high-voltage linear potentiometer RP1 is connected to the non-inverting input of the operational amplifier U1 and output after being losslessly replicated by a voltage follower (1:1). The output signal of the operational amplifier U1 is connected to the reference pin of the TL431 U2 through the isolation diode D02, providing an adjustable reference signal for closed-loop voltage regulation. The cathode signal of the TL431 U2 is connected to the positive terminal of the energy storage capacitor C03, dynamically shunting and adjusting the high-voltage bus potential to stabilize the output high voltage at the set value. The high-voltage signal of the energy storage capacitor C03 is connected to one end of the trigger resistor R04, continuously charging the trigger capacitor C04. The voltage signal of the trigger capacitor C04 is connected to one end of the bidirectional trigger diode Q1. When the voltage rises to the breakdown voltage, the bidirectional trigger diode Q1 conducts and outputs a trigger pulse. The trigger pulse signal of the bidirectional trigger diode Q1 is connected to the control terminal of the bidirectional thyristor Q2, driving the bidirectional thyristor Q2 to conduct and output controlled AC from the output terminal OUT.

[0061] The position change signal of the sliding tap of the rotary potentiometer RP1 is connected to the non-inverting input of the operational amplifier U1, changing the voltage division ratio. The voltage division ratio change signal is connected to the reference pin of the TL431 U2, dynamically adjusting the high-voltage regulation threshold. The high-voltage regulation threshold change signal is connected to one end of the trigger resistor R04, changing the charging rate of the trigger capacitor C04. The charging rate change signal is connected to the conduction time of the bidirectional trigger diode Q1, adjusting the trigger pulse frequency and the thyristor conduction angle.

[0062] This invention adds operational amplifier impedance isolation buffer, single potentiometer stepless voltage regulation, and voltage-trigger parameter linkage structure, resulting in higher voltage regulation linearity and better triggering stability.

[0063] This invention addresses the inherent drawbacks of traditional voltage multiplier trigger circuits, such as fixed threshold values, significant voltage divider load effects, poor linearity of adjustment, and unadjustable trigger parameters.

[0064] This invention is a pure hardware circuit that eliminates sampling load interference through operational amplifier isolation, achieves online continuous voltage adjustment with a single knob, and allows trigger parameters to adapt to voltage changes, thereby improving the circuit's versatility and reliability.

[0065] The above are merely specific embodiments of the present invention and should not be construed as limiting the scope of the present invention. Equivalent variations made by those skilled in the art based on this invention, as well as changes well-known to those skilled in the art, should still fall within the scope of the present invention.

[0066] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A voltage doubler trigger circuit with operational amplifier buffer isolation and potentiometer stepless voltage adjustment, characterized in that, include: The AC voltage multiplier main circuit multiplies the AC input voltage through the energy storage capacitor (C03); The closed-loop voltage regulator module uses a reference source (TL431U2), a first clamping diode (D04), a second clamping diode (D03), and an adjustable reference signal to perform closed-loop regulation of the voltage on the energy storage capacitor (C03), i.e. the voltage multiplier threshold. The buffered voltage divider sampling loop isolates the load effect of the potentiometer voltage divider network through a high-voltage linear potentiometer (RP1) and an operational amplifier (U1), and provides an adjustable reference signal, and performs online threshold adjustment; The trigger timing circuit generates trigger pulses through the trigger resistor (R04), trigger capacitor (C04), and bidirectional trigger diode (Q1); The thyristor output circuit is turned on by the trigger pulse of the bidirectional trigger diode (Q1) through the bidirectional thyristor (Q2).

2. The circuit as claimed in claim 1, characterized in that, In the closed-loop voltage regulator module, the reference source (TL431 U2) has a built-in 2.5V reference, and the regulated output voltage on the energy storage capacitor (C03), i.e., the voltage multiplication threshold, satisfies the following:

3. The circuit as described in claim 1, characterized in that, The trigger pulse period and trigger frequency are adjusted in tandem by continuously adjusting the threshold voltage. The charging time t of the trigger capacitor (C04) satisfies the following:

4. The circuit according to claim 3, characterized in that, The voltage multiplier trigger circuit has an adjustable voltage multiplier threshold range of 40V to 155V, a corresponding adjustable trigger pulse period range of 58μs to 354μs, and a trigger frequency that can be continuously adjusted within the range of 2.82kHz to 17.2kHz.

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