Hall electric push cathode ignition power supply device

Abstract

The invention discloses a Hall electric push cathode ignition power supply device which comprises a constant current output unit, a high voltage output unit, a control circuit, a primary side RCD flyback circuit and a current limiting resistor Rr. Wherein the output end of the high-voltage output unit is connected in parallel with the output end of the constant-current output unit through the current-limiting resistor Rr; the primary side RCD flyback circuit is connected with the RCD flyback converter; the input end of the constant-current output unit and the input end of the high-voltage output unit are respectively connected with the RCD flyback converter; and the control circuit is connected with the primary side RCD flyback circuit. The system has the advantages of low cost, simple and reliable structure, flexible control and high compatibility.

Description

Technical Field

[0001] The invention belongs to the field of aerospace power supply topology and control technology, and in particular relates to a Hall electric push cathode ignition power supply device. Background Art

[0002] The Hall thruster uses the spiral motion of electrons in the discharge chamber to ionize the working fluid to generate plasma, and the plasma is ejected at high speed under the action of the anode electric field and the Lorentz force, thereby generating thrust. The Hall thruster is a type of electric propulsion with relatively high thrust power.

[0003] The cathode structure of the Hall thruster is as follows: Figure 1 As shown in the figure, cathode ignition is a key step in the Hall thruster startup process. After applying the ignition high voltage, arc discharge ignition is achieved between the cathode and the contact electrode, and a stable working current emission is maintained under an appropriate working voltage. The traditional cathode ignition power supply uses a high-voltage ignition power supply and a contact electrode power supply to switch. After the high-voltage ignition is successfully applied, it quickly switches from the high-voltage ignition power supply to the contact electrode power supply. Its circuit is relatively complex and has high requirements on the response speed and reliability of the switching circuit. Summary of the invention

[0004] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide a Hall electric cathode ignition power supply device, which has the advantages of reduced cost, simple and reliable structure, flexible control and strong compatibility.

[0005] The object of the present invention is achieved by the following technical solution: A Hall electric cathode ignition power supply device, comprising: a constant current output unit, a high voltage output unit, a control circuit, a primary side RCD flyback circuit and a current limiting resistor R r ; Wherein, the output end of the high voltage output unit is connected to the current limiting resistor R r and the output end of the constant current output unit in parallel; the primary RCD flyback circuit is connected to the RCD flyback converter; the input end of the constant current output unit and the input end of the high voltage output unit are respectively connected to the RCD flyback converter; the control circuit is connected to the primary RCD flyback circuit.

[0006] In the above-mentioned Hall electric cathode ignition power supply device, the primary side RCD flyback circuit includes a resistor R sn , capacitor C sn 、Diode D sn and switch tube Q; wherein the resistor R sn One end of the capacitor C sn One end of the resistor R and the end of the same name as the primary winding of the transformer of the RCD flyback converter are connected to the positive electrode of the input power supply; sn The other end and the capacitor C snThe other end of the diode D sn The cathode of the diode D is connected; sn The anode is connected to the opposite end of the primary winding of the transformer of the RCD flyback converter and the drain of the switch tube Q respectively; the source of the switch tube Q is connected to the negative electrode of the input power supply; and the gate of the switch tube Q is connected to the control circuit.

[0007] In the above-mentioned Hall electric cathode ignition power supply device, the constant current output unit includes a diode D 1 、Diode D 4 , capacitor C o1 , resistor R s and capacitor C o4 ; wherein the diode D 1 The anode of the diode D is connected to the opposite end of the secondary winding of the first transformer of the RCD flyback converter; 1 The cathode and the capacitor C o1 The positive electrode of the diode D 4 The anode of the first transformer of the RCD flyback converter is connected to the same end of the secondary winding of the capacitor C o1 The negative electrode and the resistor R s One end of the diode D is connected; 4 The cathode and the capacitor C o4 The positive electrode, the current limiting resistor R r and the contact electrode of the Hall electric push cathode; the resistor R s The other end and the capacitor C o4 The negative electrode is respectively connected to the cathode bottom plate of the Hall electric cathode.

[0008] In the above-mentioned Hall electric cathode ignition power supply device, the high-voltage output unit includes a first high-voltage module and a second high-voltage module; wherein the first high-voltage module and the current limiting resistor R r The other end is connected to the first high-voltage module; the first high-voltage module is connected to the second high-voltage module; the second transformer secondary winding of the RCD flyback converter is connected to the first high-voltage module; the third transformer secondary winding of the RCD flyback converter is connected to the second high-voltage module.

[0009] In the above-mentioned Hall electric cathode ignition power supply device, the first high voltage module includes a diode D 2 and capacitor C o2 ; wherein the diode D 2 The anode of the diode D is connected to the opposite end of the secondary winding of the second transformer; 2 The cathode of the capacitor C o2 The positive electrode and the current limiting resistor R rThe other end of the capacitor C o2 The negative pole portion is connected to the same-name end of the secondary winding of the second transformer and the second high-voltage module.

[0010] In the above-mentioned Hall electric cathode ignition power supply device, the second high voltage module includes a diode D 3 and capacitor C o3 ; wherein the diode D 3 The anode of the diode D is connected to the opposite end of the secondary winding of the third transformer; 3 The cathode of the capacitor C o3 The positive electrode of the capacitor C o2 The negative electrode of the capacitor C is connected to the same end of the secondary winding of the second transformer; o3 The negative pole of the transformer is connected to the same end of the secondary winding of the third transformer.

[0011] In the above-mentioned Hall electric cathode ignition power supply device, the control circuit includes a current sampling unit, a PI current loop unit, a limiter unit, a voltage sampling unit, a PI voltage loop unit, a diode D 42 、Diode D 52 , resistor R 10 , reference voltage V ref , control chip and drive chip; wherein the current sampling unit is connected to the PI current loop unit; the PI current loop unit is respectively connected to the limiter unit and the diode D 42 The cathode of the diode D is connected; 42 The anode is connected to the control chip and the resistor R 10 one end of the resistor R 10 The other end and the reference voltage V ref The control chip is connected to the driving chip; the driving chip is connected to the gate of the switch tube Q; the limiter unit is connected to the PI voltage loop unit; the PI voltage loop unit is respectively connected to the voltage sampling unit and the diode D 52 The cathode of the diode D is connected; 52 The anode is connected to the control chip.

[0012] In the above-mentioned Hall electric cathode ignition power supply device, the current sampling unit includes a resistor R 1 , resistor R 2 , resistor R 3 , resistor R 4 and operational amplifier EA1; wherein the resistor R 1 One end and resistor R s One end of the resistor R 2 One end and resistor Rs The other end of the operational amplifier EA1 is connected to the resistor R 2 The other end and the resistor R 4 one end of the resistor R 4 The other end is connected to the signal ground; the inverting end of the operational amplifier EA1 is connected to the resistor R 1 The other end and the resistor R 3 The output end of the operational amplifier EA1 is connected to the resistor R 3 The other end is connected to the PI current loop unit.

[0013] In the above-mentioned Hall electric cathode ignition power supply device, the PI current loop unit includes a resistor R 7 , resistor R 8 , resistor R 9 , operational amplifier EA2, capacitor C 1 and capacitor C 2 ; Wherein, the resistor R 7 One end of the operational amplifier EA1 is connected to the output end of the operational amplifier EA2; the inverting end of the operational amplifier EA2 is connected to the resistor R 7 The other end of the resistor R 9 One end and the capacitor C 1 The in-phase end of the operational amplifier EA2 is connected to the resistor R 8 One end of the resistor R 8 The other end is connected to the current reference signal i base connected to the amplitude limiting unit; the resistor R 9 The other end and the capacitor C 2 The output end of the operational amplifier EA2 is connected to the capacitor C 2 The other end of the capacitor C 1 The other end of the diode D 42 The cathode is connected.

[0014] In the above-mentioned Hall electric cathode ignition power supply device, the limiting unit includes a voltage regulator diode D Z1 and Zener diode D Z2 ; Wherein, the voltage stabilizing diode D Z1 The anode of the Zener diode D Z2 The anodes of the voltage stabilizing diodes D Z1 The cathode and the resistor R 8 The other end of the voltage stabilizing diode D Z2 The cathode is connected to the PI voltage loop unit.

[0015] In the above-mentioned Hall electric cathode ignition power supply device, the PI voltage loop unit includes a resistor R 13 , resistor R 14 , resistor R 15 , operational amplifier EA3, capacitor C 3 and capacitor C 4 ; wherein the inverting terminal of the operational amplifier EA3 is respectively connected to the resistor R 13 One end of the resistor R 15 One end and the capacitor C 3 one end of the resistor R 13 The other end of the resistor R 15 The other end of the capacitor C 4 The in-phase end of the operational amplifier EA3 is connected to the resistor R 14 One end of the resistor R 14 The other end of the voltage regulator diode D Z2 The cathode and voltage reference signal v base The output end of the operational amplifier EA3 is connected to the capacitor C 4 The other end of the capacitor C 3 The other end of the diode D 52 The cathode is connected.

[0016] In the above-mentioned Hall electric cathode ignition power supply device, the voltage sampling unit includes a resistor R 22 and resistor R 42 ; Wherein, the resistor R 22 One end and capacitor C o1 The voltage across the two ends is v Co1 connected; the resistor R 22 The other end is connected to the resistor R 13 The other end and the resistor R 42 One end of is connected;

[0017] The resistor R 42 The other end is connected to the signal ground.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The invention has the advantages of reduced cost, simple and reliable structure, flexible control and strong compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0021] Figure 1 is a schematic diagram of the cathode structure of a Hall thruster in the prior art;

[0022] Figure 2 This is a circuit diagram of a Hall electric cathode ignition power supply device provided by an embodiment of the present invention;

[0023] Figure 3 This is an ignition waveform diagram (maximum output voltage and full-load output current) of a Hall electric cathode ignition power supply device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] Figure 2 1 is a circuit diagram of a Hall electric cathode ignition power supply device provided by an embodiment of the present invention. Figure 2 As shown, the Hall electric cathode ignition power supply device includes: a constant current output unit, a high voltage output unit, a control circuit, a primary side RCD flyback circuit and a current limiting resistor R r ; Wherein, the output end of the high voltage output unit is connected to the current limiting resistor R r and the output end of the constant current output unit in parallel; the primary RCD flyback circuit is connected to the RCD flyback converter; the input end of the constant current output unit and the input end of the high voltage output unit are respectively connected to the RCD flyback converter; the control circuit is connected to the primary RCD flyback circuit.

[0026] The primary RCD flyback circuit includes a resistor R connected to the positive pole of the input power supply. sn One end of the capacitor C sn One end of the transformer primary winding and the same end; the resistor R sn The other end of the capacitor C sn The other end of the diode D snThe cathode of diode D is connected; sn The anode is connected to the opposite end of the primary winding of the transformer and the drain of the switch tube Q; the source of the switch tube Q is connected to the negative electrode of the input power supply.

[0027] The turns of the primary winding of the transformer are per unit. The input of the constant current output unit and the input of the high voltage output unit are respectively connected to the output windings of different turns of the RCD flyback converter. The turns ratio of the secondary winding of the transformer connected to the constant current output unit to the primary winding is n. 1 : 1, connect the high voltage module 1 transformer secondary winding and primary winding turns ratio is n 2 : 1. Connect the high voltage module 2. The turns ratio of the secondary winding to the primary winding of the transformer is n 3 : 1, and the number of turns of the secondary winding of the transformer connected to each high-voltage module is greater than the number of turns of the secondary winding of the transformer connected to the constant current output unit.

[0028] The constant current output unit consists of a diode D 1 、Diode D 4 and capacitor C o1 The anode of the diode is connected to the opposite end of the secondary winding of the transformer. 1 The cathode and capacitor C o1 Anode and diode D 4 The anode of the transformer is connected to the same end of the secondary winding and the capacitor C o1 Negative electrode and resistor R s One end of the diode D 4 The cathode and capacitor C o4 The positive electrode is connected to the positive electrode of the device output, and the resistor R s The other end and capacitor C o4 The negative pole is connected to the negative pole of the device output.

[0029] The high-voltage output unit is composed of two high-voltage modules connected in series. Each high-voltage module consists of a diode and a capacitor. The anode of the diode is connected to the opposite end of the secondary winding of the transformer, and the cathode of the diode is connected to the positive electrode of the capacitor and the current limiting resistor R r Or the negative electrode of the capacitor of another high-voltage module is connected to the same-name end of the secondary winding of another transformer, and the negative electrode of the capacitor is connected to the same-name end of the secondary winding of the transformer and the resistor R s One end of the high voltage module or the positive electrode of the capacitor of another high voltage module is connected to the cathode of another diode. Each transformer secondary winding connected to the high voltage output module has the same number of turns.

[0030] The control circuit is divided into a current sampling unit, a PI current loop unit, a voltage sampling unit, a PI voltage loop unit, and a diode D 4 、Diode D 5 , resistor R 10 , reference voltage Vref , control chip and driver chip.

[0031] The resistor R connected in series with the output ground line s The voltage at both ends is used as the input of the current sampling unit, and the output of the current sampling unit is i s It is the input of PI current loop unit. Capacitor C o1 The voltage across the two ends is v Co1 is the input of the voltage sampling unit, and the output of the voltage sampling unit v s It is the input of PI voltage loop unit.

[0032] like Figure 2 As shown, the primary RCD flyback circuit includes a resistor R sn , capacitor C sn 、Diode D sn and switch tube Q; wherein the resistor R sn One end of the capacitor C sn One end of the resistor R and the end of the same name as the primary winding of the transformer of the RCD flyback converter are connected to the positive electrode of the input power supply; sn The other end and the capacitor C sn The other end of the diode D sn The cathode of the diode D is connected; sn The anode is connected to the opposite end of the primary winding of the transformer of the RCD flyback converter and the drain of the switch tube Q respectively; the source of the switch tube Q is connected to the negative electrode of the input power supply; and the gate of the switch tube Q is connected to the control circuit.

[0033] like Figure 2 As shown, the constant current output unit includes a diode D 1 、Diode D 4 , capacitor C o1 , resistor R s and capacitor C o4 ; wherein the diode D 1 The anode of the diode D is connected to the opposite end of the secondary winding of the first transformer of the RCD flyback converter; 1 The cathode and the capacitor C o1 The positive electrode of the diode D 4 The anode of the first transformer of the RCD flyback converter is connected to the same end of the secondary winding of the capacitor C o1 The negative electrode and the resistor R s One end of the diode D is connected; 4 The cathode and the capacitor C o4 The positive electrode, the current limiting resistor R r and the contact electrode of the Hall electric push cathode; the resistor Rs The other end and the capacitor C o4 The negative electrode is respectively connected to the cathode bottom plate of the Hall electric cathode.

[0034] like Figure 2 As shown, the high-voltage output unit includes a first high-voltage module and a second high-voltage module; wherein the first high-voltage module and the current limiting resistor R r The other end is connected to the first high-voltage module; the first high-voltage module is connected to the second high-voltage module; the second transformer secondary winding of the RCD flyback converter is connected to the first high-voltage module; the third transformer secondary winding of the RCD flyback converter is connected to the second high-voltage module.

[0035] like Figure 2 As shown, the first high voltage module includes a diode D 2 and capacitor C o2 ; wherein the diode D 2 The anode of the diode D is connected to the opposite end of the secondary winding of the second transformer; 2 The cathode of the capacitor C o2 The positive electrode and the current limiting resistor R r The other end of the capacitor C o2 The negative pole portion is connected to the same-name end of the secondary winding of the second transformer and the second high-voltage module.

[0036] like Figure 2 As shown, the second high voltage module includes a diode D 3 and capacitor C o3 ; wherein the diode D 3 The anode of the diode D is connected to the opposite end of the secondary winding of the third transformer; 3 The cathode of the capacitor C o3 The positive electrode of the capacitor C o2 The negative electrode of the capacitor C is connected to the same end of the secondary winding of the second transformer; o3 The negative pole of the transformer is connected to the same end of the secondary winding of the third transformer.

[0037] like Figure 2 As shown, the control circuit includes a current sampling unit, a PI current loop unit, a limiting unit, a voltage sampling unit, a PI voltage loop unit, a diode D 42 、Diode D 52 , resistor R 10 , reference voltage V ref , control chip and drive chip; wherein the current sampling unit is connected to the PI current loop unit; the PI current loop unit is respectively connected to the limiter unit and the diode D 42 The cathode of the diode D is connected;42 The anode is connected to the control chip and the resistor R 10 one end of the resistor R 10 The other end and the reference voltage V ref The control chip is connected to the driving chip; the driving chip is connected to the gate of the switch tube Q; the limiter unit is connected to the PI voltage loop unit; the PI voltage loop unit is respectively connected to the voltage sampling unit and the diode D 52 The cathode of the diode D is connected; 52 The anode is connected to the control chip.

[0038] like Figure 2 As shown, the current sampling unit includes a resistor R 1 , resistor R 2 , resistor R 3 , resistor R 4 and operational amplifier EA1; wherein the resistor R 1 One end and resistor R s One end of the resistor R 2 One end and resistor R s The other end of the operational amplifier EA1 is connected to the resistor R 2 The other end and the resistor R 4 one end of the resistor R 4 The other end is connected to the signal ground; the inverting end of the operational amplifier EA1 is connected to the resistor R 1 The other end and the resistor R 3 The output end of the operational amplifier EA1 is connected to the resistor R 3 The other end is connected to the PI current loop unit.

[0039] like Figure 2 As shown, the PI current loop unit includes a resistor R 7 , resistor R 8 , resistor R 9 , operational amplifier EA2, capacitor C 1 and capacitor C 2 ; Wherein, the resistor R 7 One end of the operational amplifier EA1 is connected to the output end of the operational amplifier EA2; the inverting end of the operational amplifier EA2 is connected to the resistor R 7 The other end of the resistor R 9 One end and the capacitor C 1 The in-phase end of the operational amplifier EA2 is connected to the resistor R 8 One end of the resistor R 8The other end is connected to the current reference signal i base connected to the amplitude limiting unit; the resistor R 9 The other end and the capacitor C 2 The output end of the operational amplifier EA2 is connected to the capacitor C 2 The other end of the capacitor C 1 The other end of the diode D 42 The cathode is connected.

[0040] like Figure 2 As shown, the limiting unit includes a voltage-stabilizing diode D Z1 and Zener diode D Z2 ; Wherein, the voltage stabilizing diode D Z1 The anode of the Zener diode D Z2 The anodes of the voltage stabilizing diodes D Z1 The cathode and the resistor R 8 The other end of the voltage stabilizing diode D Z2 The cathode is connected to the PI voltage loop unit.

[0041] like Figure 2 As shown, the PI voltage loop unit includes a resistor R 13 , resistor R 14 , resistor R 15 , operational amplifier EA3, capacitor C 3 and capacitor C 4 ; wherein the inverting terminal of the operational amplifier EA3 is respectively connected to the resistor R 13 One end of the resistor R 15 One end and the capacitor C 3 one end of the resistor R 13 The other end of the resistor R 15 The other end of the capacitor C 4 The in-phase end of the operational amplifier EA3 is connected to the resistor R 14 One end of the resistor R 14 The other end of the voltage regulator diode D Z2 The cathode and voltage reference signal v base The output end of the operational amplifier EA3 is connected to the capacitor C 4 The other end of the capacitor C 3 The other end of the diode D 52 The cathode is connected.

[0042] like Figure 2 As shown, the voltage sampling unit includes a resistor R 22 and resistor R42 ; Wherein, the resistor R 22 One end and capacitor C o1 The voltage across the two ends is v Co1 connected; the resistor R 22 The other end is connected to the resistor R 13 The other end and the resistor R 42 one end of the resistor R 42 The other end is connected to the signal ground.

[0043] like Figure 2 As shown, the constant current output unit is composed of a diode D 1 、Diode D 4 and capacitor C o1 The anode of the diode is connected to the opposite end of the secondary winding of the transformer. 1 The cathode and capacitor C o1 Anode and diode D 4 The anode of the transformer is connected to the same end of the secondary winding and the capacitor C o1 And the resistor R s One end of the diode D 4 The cathode and capacitor C o4 The positive pole is connected. Diode D 1 Responsible for rectifying the AC voltage induced by the primary winding of the transformer secondary winding. Capacitor C o1 The diode D 1 The rectified AC voltage is filtered. Since the voltage stress of the device in the high-voltage output unit is greater than the voltage stress in the constant-current output unit, in order to reduce costs and extend the service life of the device in the constant-current output unit, a high-voltage resistant diode D is selected. 4 Isolate the high voltage output unit.

[0044] The high-voltage output unit is composed of two high-voltage modules connected in series. Each high-voltage module consists of a diode and a capacitor. The anode of the diode is connected to the opposite end of the secondary winding of the transformer, and the cathode of the diode is connected to the positive electrode of the capacitor and the current limiting resistor R r Or the negative electrode of the capacitor of another high-voltage module is connected to the same-name end of the secondary winding of another transformer, and the negative electrode of the capacitor is connected to the same-name end of the secondary winding of the transformer and the resistor R s One end of the high voltage module or the positive electrode of the capacitor of another high voltage module is connected to the cathode of another diode. Each transformer secondary winding connected to the high voltage output module has the same number of turns.

[0045] In the current sampling unit, the resistor R 1 One end of the resistor R connected in series with the output ground wire s One end of the resistor R 2 One end of the resistor R connected in series with the output ground wires The other end is connected to the resistor R 2 The other end is connected to the non-inverting terminal of the operational amplifier EA1 and connected to the resistor R 4 Connect to signal ground. Resistor R 1 The other end of the operational amplifier EA1 and the inverting terminal and resistor R 3 One end of the resistor R 3 The other end is connected to the output end of the operational amplifier EA1 and the resistor R in the PI current loop unit 7 One end is connected.

[0046] In the PI current loop unit, the resistor R 7 The other end of the operational amplifier EA2 and the inverting end of the resistor R 9 One end of the capacitor C 1 One end of the current reference signal i base Through the resistor R 8 Connected to the non-inverting terminal of operational amplifier EA2. 9 The other end and capacitor C 2 One end of the capacitor C 2 The other end and capacitor C 1 The other end is connected to the output of the operational amplifier EA2, and finally the output of the operational amplifier EA2 v ea1 Connect to diode D 42 cathode.

[0047] In the voltage sampling unit, the resistor R 22 One end and capacitor C o1 The voltage across the two ends is v Co1 Connected, resistor R 22 The other end and the resistor R in the PI voltage loop unit 13 One end and the resistor R 42 Connect to signal ground.

[0048] In the PI voltage loop unit, the resistor R 13 The other end of the operational amplifier EA3 and the inverting end of the resistor R 15 One end of the capacitor C 3 One end is connected to the voltage reference signal v base Through the resistor R 14 Connected to the non-inverting terminal of operational amplifier EA3. 15 The other end and capacitor C 4 One end of the capacitor C 4 The other end and capacitor C 3 The other end is connected to the output of the operational amplifier EA3, and finally the output v of the operational amplifier EA3 is ea2 Connect to diode D 52cathode.

[0049] After the control chip receives the high-level signal from the external device, the device starts to ignite. The ignition process is sequentially divided into the high-voltage ignition preparation stage, the ignition stage and the constant current output stage. After the device is started, it enters the high-voltage ignition preparation stage. The output of the device is approximately in the no-load state, and the equivalent impedance is relatively high (greater than 100kΩ in this embodiment). At this time, the output v of the PI voltage loop unit is ea2 and the output v of the PI current loop unit ea1 All are reference voltage values ​​V ref , the voltage value of the input control chip is V ref , the switch tube Q will reach the maximum duty cycle, and the output voltage v o Gradually rises to the predetermined ignition voltage value, providing conditions for ignition. o After reaching the predetermined ignition voltage value, the output v of the PI voltage loop unit ea2 will be less than the reference voltage V ref At this time, the voltage value of the input control chip is v ea2 , the duty cycle of the switch tube Q decreases, and the output voltage v o Stable near the predetermined ignition voltage value. During the ignition stage, the gas in the cathode is broken down by the high voltage, resulting in a voltage drop and a large impact current. After the ignition stage, the device enters the constant current output stage. The output of the device can be considered to be in a loaded state, and the equivalent impedance is low (less than 20Ω in this embodiment). At this time, the output v of the PI voltage loop unit is ea2 Will increase to V ref Since the load equivalent impedance is small, the output voltage will not rise to the ignition voltage value. After the output current reaches the preset steady-state current value, the output v of the PI current loop unit ea1 will be less than the reference voltage V ref , so the voltage value of the input control chip is v ea1 , the output current is stable near the preset steady-state current value, which is regarded as the device function being realized.

[0050] The current reference signal i in the PI current loop unit base The output current of the constant current output unit is adjusted in real time by externally providing a constant voltage fixed regulation or an external chip providing a variable voltage. Since the output v of the PI current loop unit is only in the constant current output stage ea1 will be less than the reference voltage V ref , so the output current of the device can only be adjusted in real time during the constant current output stage.

[0051] The voltage reference signal v in the PI voltage loop unit baseThe output voltage of the high-voltage output unit is adjusted in real time by external constant voltage fixed regulation or external chip providing variable voltage. The output voltage of the device is adjusted in real time before the device is turned on or in the high-voltage ignition preparation stage.

[0052] In order to reduce the voltage stress of the devices in the high-voltage output unit, multiple high-voltage modules can be connected in series to achieve high-voltage output of devices with lower voltage stress. The series connection of multiple high-voltage modules requires an increase in the number of secondary windings of the transformer. For each additional secondary winding of the transformer, a corresponding high-voltage module is added.

[0053] The output end of the PI current loop unit is the same as the diode D 42 The cathode of the PI voltage loop unit is connected to the output end of the diode D 52 The cathode of diode D is connected. 42 and D 52 The anode of the 10 and reference voltage V ref The PWM waveform output by the control chip drives the switch tube Q through the driver chip.

[0054] The current reference signal i in the PI current loop unit base The output current of the constant current output unit is adjusted in real time by externally applying a constant voltage fixed regulation or an external chip providing a variable voltage.

[0055] The voltage reference signal v in the PI voltage loop unit base The output voltage of the high-voltage output unit can be adjusted in real time by externally applying a constant voltage fixed regulation or an external chip providing a variable voltage.

[0056] Zener diode D Z1 and D Z2 The limiting unit, the voltage regulator diode D Z1 and D Z2 The anode of the voltage regulator diode D is connected to the signal ground. Z1 The cathode is connected to the current reference signal i in the PI current loop unit base , to prevent the output overcurrent problem caused by the current reference signal exceeding the preset amplitude; the voltage regulator diode D Z2 The cathode is connected to the voltage reference signal v in the PI voltage loop unit base , to prevent the output overvoltage problem caused by the voltage reference signal exceeding the preset amplitude. Z1 and D Z2 The configuration of the clipping unit is not a limitation of the present invention. For example, there are other configurations of the clipping unit and the current reference signal i is connected to the PI current loop unit. base and the voltage reference signal v in the PI voltage loop unit base , are deemed to be within the protection scope of the present invention.

[0057] The control chip determines whether to turn on the device through the level signal EN given by the external device.

[0058] Specifically, the transformer primary winding has 5 turns, the transformer secondary winding connected to the constant current output unit has 5 turns, and the two transformer complex windings connected to the high-voltage module have 30 turns. The device input is 24V~46V, the ignition high voltage can reach 600V, and the constant current output stage current can output 2.5A. Figure 3 The high-voltage ignition process of the device at full load is demonstrated. CH1 is the output voltage waveform, and CH2 is the output current waveform. It can be seen that the output voltage of the device drops rapidly from 600V to around 15V, and the output current increases from 0A to 2.5A and continues to operate stably, which is considered that the device has been successfully ignited.

[0059] Based on the multi-channel output of the RCD flyback converter, this embodiment connects the output terminals in parallel, can realize the high-voltage ignition function and switch to the mode of outputting low-voltage stable current after successful ignition, and can adjust the output ignition voltage and low-voltage stable current according to different voltage and current reference signals. Compared with the traditional cathode ignition power supply device, this embodiment has lower cost, simple and reliable structure, flexible control and strong compatibility.

[0060] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A Hall electric cathode ignition power supply device, characterized in that include: Constant current output unit, high voltage output unit, control circuit, primary RCD flyback circuit and current limiting resistor R r ;in, The output end of the high voltage output unit is connected to the current limiting resistor R r connected in parallel with the output end of the constant current output unit; The primary side RCD flyback circuit is connected to the RCD flyback converter; The input end of the constant current output unit and the input end of the high voltage output unit are respectively connected to the RCD flyback converter; The control circuit is connected to the primary side RCD flyback circuit.

2. The Hall electric cathode ignition power supply device according to claim 1 is characterized in that: The primary side RCD flyback circuit includes a resistor R sn , capacitor C sn 、Diode D sn and switch tube Q; where, The resistor R sn One end of the capacitor C sn One end of the transformer and the end of the same name as the primary winding of the RCD flyback converter are connected to the positive pole of the input power supply; The resistor R sn The other end and the capacitor C sn The other end of the diode D sn The cathode of is connected; The diode D sn The anode is connected to the opposite end of the primary winding of the transformer of the RCD flyback converter and the drain of the switch tube Q respectively; The source of the switch tube Q is connected to the negative electrode of the input power supply; The gate of the switch tube Q is connected to the control circuit.

3. The Hall electric cathode ignition power supply device according to claim 1 is characterized in that: The constant current output unit includes a diode D1, a diode D4, a capacitor C o1 , resistor R s and capacitor C o4 ;in, The anode of the diode D1 is connected to the opposite end of the secondary winding of the first transformer of the RCD flyback converter; The cathode of the diode D1 is respectively connected to the capacitor C o1 The positive electrode of and the anode of the diode D4 are connected; The same-name end of the secondary winding of the first transformer of the RCD flyback converter is respectively connected to the capacitor C o1 The negative electrode and the resistor R s One end of is connected; The cathode of the diode D4 is respectively connected to the capacitor C o4 The positive electrode, the current limiting resistor R r One end of the Hall electrode is connected to the contact electrode of the Hall electrode cathode; The resistor R s The other end and the capacitor C o4 The negative electrode is respectively connected to the cathode bottom plate of the Hall electric cathode.

4. The Hall electric cathode ignition power supply device according to claim 1, characterized in that: The high voltage output unit includes a first high voltage module and a second high voltage module; wherein, The first high voltage module and the current limiting resistor R r The other end is connected; The first high voltage module is connected to the second high voltage module; The secondary winding of the second transformer of the RCD flyback converter is connected to the first high-voltage module; The third transformer secondary winding of the RCD flyback converter is connected to the second high-voltage module.

5. The Hall electric cathode ignition power supply device according to claim 4 is characterized in that: The first high voltage module includes a diode D2 and a capacitor C o2 ;in, The anode of the diode D2 is connected to the opposite end of the secondary winding of the second transformer; The cathode of the diode D2 is respectively connected to the capacitor C o2 The positive electrode and the current limiting resistor R r The other end is connected; The capacitor C o2 The negative pole portion is connected to the same-name end of the secondary winding of the second transformer and the second high-voltage module.

6. The Hall electric cathode ignition power supply device according to claim 5, characterized in that: The second high voltage module includes a diode D3 and a capacitor C o3 ;in, The anode of the diode D3 is connected to the opposite end of the secondary winding of the third transformer; The cathode of the diode D3 is respectively connected to the capacitor C o3 The positive electrode of the capacitor C o2 The negative pole of is connected to the same end of the secondary winding of the second transformer; The capacitor C o3 The negative pole of the transformer is connected to the same end of the secondary winding of the third transformer.

7. The Hall electric cathode ignition power supply device according to claim 1 or 2, characterized in that: The control circuit includes a current sampling unit, a PI current loop unit, a limiting unit, a voltage sampling unit, a PI voltage loop unit, a diode D 42 、Diode D 52 , resistor R 10 , reference voltage V ref , control chip and driver chip; among them, The current sampling unit is connected to the PI current loop unit; The PI current loop unit is respectively connected to the limiter unit and the diode D 42 The cathode of is connected; The diode D 42 The anode is connected to the control chip and the resistor R 10 one end of the resistor R 10 The other end and the reference voltage V ref Connected; The control chip is connected to the drive chip; The driving chip is connected to the gate of the switch tube Q; The limiting unit is connected to the PI voltage loop unit; The PI voltage loop unit is respectively connected to the voltage sampling unit and the diode D 52 The cathode of is connected; The diode D 52 The anode is connected to the control chip.

8. The Hall electric cathode ignition power supply device according to claim 7, characterized in that: The current sampling unit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4 and an operational amplifier EA1; wherein, One end of the resistor R1 and the resistor R s One end of the resistor R2 is connected to the resistor R s The other end is connected; The in-phase terminal of the operational amplifier EA1 is connected to the other end of the resistor R2 and one end of the resistor R4 respectively; The other end of the resistor R4 is connected to the signal ground; The inverting end of the operational amplifier EA1 is connected to the other end of the resistor R1 and one end of the resistor R3 respectively; The output end of the operational amplifier EA1 is connected to the other end of the resistor R3 and the PI current loop unit respectively.

9. The Hall electric cathode ignition power supply device according to claim 8, characterized in that: The PI current loop unit includes a resistor R7, a resistor R8, a resistor R9, an operational amplifier EA2, a capacitor C1 and a capacitor C2; wherein, One end of the resistor R7 is connected to the output end of the operational amplifier EA1; The inverting end of the operational amplifier EA2 is respectively connected to the other end of the resistor R7, one end of the resistor R9 and one end of the capacitor C1; The in-phase terminal of the operational amplifier EA2 is connected to one end of the resistor R8, and the other end of the resistor R8 is connected to the current reference signal i base connected to the limiting unit; The other end of the resistor R9 is connected to one end of the capacitor C2; The output end of the operational amplifier EA2 is connected to the other end of the capacitor C2, the other end of the capacitor C1 and the diode D 42 The cathode is connected.

10. The Hall electric cathode ignition power supply device according to claim 9, characterized in that: The limiting unit includes a voltage stabilizing diode D Z1 and Zener diode D Z2 ;in, The voltage zener diode D Z1 The anode of the Zener diode D Z2 The anodes are all connected to the signal ground; The voltage zener diode D Z1 The cathode is connected to the other end of the resistor R8; The voltage zener diode D Z2 The cathode is connected to the PI voltage loop unit; The PI voltage loop unit includes a resistor R 13 , resistor R 14 , resistor R 15 , operational amplifier EA3, capacitor C3 and capacitor C4; wherein, The inverting terminal of the operational amplifier EA3 is respectively connected to the resistor R 13 One end of the resistor R 15 One end of is connected to one end of the capacitor C3; The resistor R 13 The other end is connected to the voltage sampling unit; The resistor R 15 The other end of is connected to one end of the capacitor C4; The non-inverting terminal of the operational amplifier EA3 is connected to the resistor R 14 One end of the resistor R 14 The other end of the voltage regulator diode D Z2 The cathode and voltage reference signal v base Connected; The output end of the operational amplifier EA3 is connected to the other end of the capacitor C4, the other end of the capacitor C3 and the diode D 52 The cathode is connected.

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