High-voltage ultralow-ripple DC-DC power supply

Abstract

The invention discloses a high-voltage ultralow-ripple DC-DC power supply which comprises a Royer resonance circuit, a voltage doubling rectifying circuit, a voltage feedback control circuit and a filter circuit. The Royer resonance circuit comprises a transformer U1, a coil L1, a capacitor C2, a triode Q1 and a triode Q2; a secondary side T6 of the transformer U1 and a secondary side T10 of the transformer U1 are both connected with a first end of the voltage doubling rectifying circuit; the second end of the voltage doubling rectifying circuit is connected with the filter circuit; the third end of the voltage doubling rectifying circuit is connected with one end of the voltage feedback control circuit; and the other end of the voltage feedback control circuit is connected between the emitter of the triode Q1 and the emitter of the triode Q2. The problems that in the prior art, a power supply cannot meet the requirement for high-voltage ultra-low ripples, and a driving circuit of an existing power supply is complex and high in cost are solved. The technical effects that the power supply has no switching noise and the driving circuit is simpler are achieved.

Description

Technical Field

[0001] The present application relates to technical fields such as medical imaging, high energy physics, environmental monitoring, and national defense security, and in particular to a high voltage and ultra-low ripple DC-DC power supply. Background Art

[0002] In recent years, in carrying out nuclear radiation reconnaissance, nuclear accident emergency and other nuclear-related diversified tasks, the energy resolution and sensitivity of nuclear radiation detectors have become increasingly demanding. The power supply voltage accuracy and ripple have a great impact on the use of energy spectrum or imaging detectors.

[0003] At present, the switching power supplies commonly used in the market are affected by their principle mechanism and cannot meet the requirements of high voltage and ultra-low ripple. With the development of photoelectric conversion devices, the driving circuits of existing power supplies are more complicated and costly. Summary of the invention

[0004] The embodiment of the present application provides a high-voltage ultra-low ripple DC-DC power supply, which solves the problem that the switching power supply commonly used in the prior art is affected by its principle mechanism, the power supply cannot meet the requirements of high-voltage ultra-low ripple, and the driving circuit of the existing power supply is relatively complex and the cost is high. The technical effect of making the power supply free of switching noise, and the driving circuit is simpler and the cost is lower is achieved.

[0005] The embodiment of the present invention provides a high-voltage ultra-low ripple DC-DC power supply, including a Royer resonant circuit, a voltage doubling rectifier circuit, a voltage feedback control circuit and a filter circuit; the Royer resonant circuit includes a transformer U1, a coil L1, a capacitor C2, a transistor Q1 and a transistor Q2; the primary side T1 of the transformer U1 is connected to the collector of the transistor Q1; the primary side T4 of the transformer U1 is connected to the base of the transistor Q1; the primary side T3 of the transformer U1 is connected to the collector of the transistor Q2; the primary side T5 of the transformer U1 is connected to the base of the transistor Q2; The primary side T2 of the transformer U1 is connected to one end of the coil L1, and a constant voltage is applied to the other end of the coil L1; the emitter of the transistor Q1 is connected to the emitter of the transistor Q2; the secondary side T6 of the transformer U1 and the secondary side T10 of the transformer U1 are both connected to the first end of the voltage doubler rectifier circuit; the second end of the voltage doubler rectifier circuit is connected to the filter circuit; the third end of the voltage doubler rectifier circuit is connected to one end of the voltage feedback control circuit; the other end of the voltage feedback control circuit is connected between the emitter of the transistor Q1 and the emitter of the transistor Q2.

[0006] In a possible implementation, the Royer resonant circuit also includes a resistor R1, a resistor R4 and a resistor R5; one end of the resistor R1 is connected to the base of the transistor Q1, and the other end of the resistor R1 is connected between the coil L1 and the primary T2 of the transformer U1; one end of the resistor R2 is connected to the base of the transistor Q2, and the other end of the resistor R2 is connected between the coil L1 and the primary T2 of the transformer U1.

[0007] In a possible implementation, the voltage feedback control circuit includes an amplifier U1A and a transistor Q3; the inverting input terminal of the amplifier U1A is connected to the third terminal of the voltage doubler rectifier circuit, and the non-inverting input terminal of the amplifier U1A is applied with a reference voltage source V-Control; the output terminal of the amplifier U1A is connected to the base of the transistor Q3; the collector of the transistor Q3 is connected between the emitter of the transistor Q1 and the emitter of the transistor Q2; and a constant voltage is applied to the emitter of the transistor Q3.

[0008] In a possible implementation, the voltage feedback control circuit includes a capacitor C6, a resistor R7 and a resistor R11; one end of the capacitor C6 is connected to the output end of the amplifier U1A, the other end of the capacitor C6 is connected to one end of the resistor R7, and the other end of the resistor R7 is connected to the reverse input end of the amplifier U1A; one end of the resistor R11 is connected to the same direction input end of the amplifier U1A, and the other end of the resistor R11 is applied with a reference voltage source V-Control.

[0009] In a possible implementation, the voltage feedback control circuit includes a transistor Q4 and a resistor R12; the collector of the transistor Q4 is connected to the output end of the amplifier U1A, the base of the transistor Q4 is connected to the emitter of the transistor Q3, and a constant voltage is applied to the emitter of the transistor Q4; one end of the resistor R12 is connected to the output end of the amplifier U1A, and a constant voltage is applied to the other end of the resistor R12.

[0010] In a possible implementation, the voltage feedback control circuit includes a resistor R13 and a capacitor C7; one end of the resistor R13 is connected to the emitter of the transistor Q3, and a constant voltage is applied to the other end of the resistor R13; one end of the capacitor C7 is connected to the base of the transistor Q3, and the other end of the capacitor C7 is connected to the base of the transistor Q4.

[0011] In a possible implementation, the voltage feedback control circuit includes a diode D3 and a diode D4; one end of the diode D3 is connected to the output end of the amplifier U1A, and the other end of the diode D3 is connected to the resistor R12; one end of the diode D4 is connected to the base of the transistor Q4, and the other end of the diode D4 is connected to the capacitor C7.

[0012] In a possible implementation, the voltage feedback control circuit includes a resistor R9; one end of the resistor R9 is connected to the third end of the voltage doubler rectifier circuit, and the other end of the resistor R9 is connected to the inverting input end of the amplifier U1A.

[0013] In a possible implementation, the voltage doubler rectifier circuit includes a diode D1, a diode D2, a capacitor C5 and a capacitor C3; one end of the diode D1 is connected to the secondary side T6 of the transformer U1, and the other end of the diode D1 is connected to one end of the diode D2; the other end of the diode D2 is connected to the filter circuit; one end of the capacitor C5 is connected to the secondary side T10 of the transformer U1, and the other end of the capacitor C5 is connected between the diode D1 and the diode D2; one end of the capacitor C3 is linked between the diode D2 and the filter circuit, and a constant voltage is applied to the other end of the capacitor C3.

[0014] In a possible implementation, the filtering circuit includes a resistor R2, a resistor R3, a capacitor C4 and a capacitor C1; one end of the resistor R2 is connected to the diode D2, and the other end of the resistor R2 is connected to the resistor R3; a constant voltage is applied to the other end of the resistor R3; one end of the capacitor C4 is connected between the resistor R2 and the resistor R3, and a constant voltage is applied to the other end of the capacitor C4; constant voltages are applied to both ends of the capacitor C1.

[0015] One or more technical solutions provided by this application have at least the following technical effects:

[0016] The embodiment of the present invention adopts a high-voltage ultra-low ripple DC-DC power supply, including a Royer resonant circuit, a voltage doubler rectifier circuit, a voltage feedback control circuit and a filter circuit; the present application can convert a DC signal into a sinusoidal AC signal through the Royer resonant circuit, and the AC signal can be converted into a DC and multiplied through the voltage doubler rectifier circuit after the transformer boosts the voltage, and the noise and interference in the circuit can be further filtered out through the filter circuit, and the output voltage ripple can be reduced. Furthermore, the present application can automatically adjust the voltage output by the voltage doubler rectifier circuit through the voltage feedback control circuit, thereby maintaining the stability of the output voltage.

[0017] The inverter circuit of the present application uses a Royer resonant circuit design to enable the circuit to generate self-oscillation. Compared with the half-bridge or full-bridge switching power supplies in the prior art, the driving circuit of the present application is simpler, and the present application does not require a power chip but only uses discrete devices to build it, thereby reducing the cost of the power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A circuit diagram of a high-voltage and ultra-low ripple DC-DC power supply provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] In the description of the embodiments of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present application. The terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "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; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0022] The embodiment of the present invention provides a high voltage ultra-low ripple DC-DC power supply, such as Figure 1As shown, it includes a Royer resonant circuit, a voltage doubling rectifier circuit, a voltage feedback control circuit and a filter circuit; the Royer resonant circuit includes a transformer U1, a coil L1, a capacitor C2, a transistor Q1 and a transistor Q2; the primary side T1 of the transformer U1 is connected to the collector of the transistor Q1; the primary side T4 of the transformer U1 is connected to the base of the transistor Q1; the primary side T3 of the transformer U1 is connected to the collector of the transistor Q2; the primary side T5 of the transformer U1 is connected to the base of the transistor Q2; the transformer U1 The primary side T2 of the transformer U1 is connected to one end of the coil L1, and a constant voltage is applied to the other end of the coil L1; the emitter of the transistor Q1 is connected to the emitter of the transistor Q2; the secondary side T6 of the transformer U1 and the secondary side T10 of the transformer U1 are both connected to the first end of the voltage doubler rectifier circuit; the second end of the voltage doubler rectifier circuit is connected to the filter circuit; the third end of the voltage doubler rectifier circuit is connected to one end of the voltage feedback control circuit; the other end of the voltage feedback control circuit is connected between the emitter of the transistor Q1 and the emitter of the transistor Q2.

[0023] Exemplarily, a direct current signal can be converted into a sinusoidal alternating current signal through a Royer resonant circuit, thereby making the power supply free of switching noise. Specifically, the inverter circuit of the present application uses the design of a Royer resonant circuit, so that the circuit generates self-excited oscillations. Compared with the half-bridge or full-bridge switching power supply in the prior art, the driving circuit of the present application is simpler, and the present application does not require a power chip but only uses discrete devices to build, thereby reducing the cost of the power supply.

[0024] Exemplarily, the present application can convert a DC signal into a sinusoidal AC signal through a Royer resonant circuit, and after the transformer boosts the voltage, the AC signal can be converted into a DC signal and multiplied through a voltage doubler rectifier circuit, and then the noise and interference in the circuit can be further filtered out through a filter circuit, and the output voltage ripple can be reduced. Furthermore, the present application can automatically adjust the voltage output by the voltage doubler rectifier circuit through a voltage feedback control circuit, thereby maintaining the stability of the output voltage.

[0025] For example, since the performances of transistor Q1 and transistor Q2 are not completely consistent, at the moment of power-on, the base currents injected into transistor Q1 and transistor Q2 are different, resulting in different collector currents flowing through transistor Q1 and transistor Q2.

[0026] Exemplarily, at the moment of power-on, the emitter current I1 of transistor Q1 is greater than the emitter current I2 of transistor Q2, then the magnetic flux of transformer U1 depends on I1, and the change of current can cause the feedback winding to generate an induced electromotive force. Specifically, the change of current can make the voltage on the feedback winding of transformer U1 an induced electromotive force with positive top and negative bottom, which can cause the base potential of transistor Q1 to increase and the collector current to increase, while the base potential of transistor Q2 to decrease and the collector current to decrease, that is, positive feedback is formed for transistor Q1 and negative feedback is formed for transistor Q2; under the interaction of the magnetic flux of transformer U1 and the induced electromotive force, transistor Q1 is saturated and turned on, and transistor Q2 is turned off. When the magnetic flux change of transformer U1 reaches its maximum value, the magnetic flux no longer changes, and the induced electromotive force is zero. Due to the disappearance of the induced electromotive force on the feedback winding, the collector current of transistor Q1 decreases, thereby generating an induced electromotive force with negative top and positive bottom on the feedback winding of transformer U1, which can lead to a decrease in the base potential of transistor Q1 and a decrease in the collector current, while an increase in the base potential and collector current of transistor Q2. That is, positive feedback is formed for transistor Q2 and negative feedback is formed for transistor Q1. Under the interaction of the magnetic flux and induced electromotive force of transformer U1, transistor Q2 is saturated and turned on, and transistor Q1 is cut off. The Royer resonant circuit cycles according to the above process, thereby forming an oscillation in the secondary winding of transformer U1. By setting the size of the resonant capacitor C2, the Royer resonant circuit oscillates at a specific frequency. The relationship is:

[0027]

[0028] Among them, C is the size of the resonant capacitor C2, f is the oscillation frequency, and L is the inductance of the primary coil of the transformer U1;

[0029] In the present application embodiment, Figure 1 As shown, the Royer resonant circuit also includes a resistor R1, a resistor R4 and a resistor R5; one end of the resistor R1 is connected to the base of the transistor Q1, and the other end of the resistor R1 is connected between the coil L1 and the primary side T2 of the transformer U1; one end of the resistor R2 is connected to the base of the transistor Q2, and the other end of the resistor R2 is connected between the coil L1 and the primary side T2 of the transformer U1.

[0030] In the present application embodiment, Figure 1As shown, the voltage feedback control circuit includes an amplifier U1A and a transistor Q3; the reverse input terminal of the amplifier U1A is connected to the third terminal of the voltage doubler rectifier circuit, and the reference voltage source V-Control is applied to the non-inverting input terminal of the amplifier U1A; the output terminal of the amplifier U1A is connected to the base of the transistor Q3; the collector of the transistor Q3 is connected between the emitter of the transistor Q1 and the emitter of the transistor Q2; and a constant voltage is applied to the emitter of the transistor Q3.

[0031] In the present application embodiment, Figure 1 As shown, the voltage feedback control circuit includes a capacitor C6, a resistor R7 and a resistor R11; one end of the capacitor C6 is connected to the output end of the amplifier U1A, the other end of the capacitor C6 is connected to one end of the resistor R7, and the other end of the resistor R7 is connected to the reverse input end of the amplifier U1A; one end of the resistor R11 is connected to the same direction input end of the amplifier U1A, and the other end of the resistor R11 is applied with a reference voltage source V-Control.

[0032] In the present application embodiment, Figure 1 As shown, the voltage feedback control circuit includes a transistor Q4 and a resistor R12; the collector of the transistor Q4 is connected to the output end of the amplifier U1A, the base of the transistor Q4 is connected to the emitter of the transistor Q3, and a constant voltage is applied to the emitter of the transistor Q4; one end of the resistor R12 is connected to the output end of the amplifier U1A, and a constant voltage is applied to the other end of the resistor R12.

[0033] In the present application embodiment, Figure 1 As shown, the voltage feedback control circuit includes a resistor R13 and a capacitor C7; one end of the resistor R13 is connected to the emitter of the transistor Q3, and a constant voltage is applied to the other end of the resistor R13; one end of the capacitor C7 is connected to the base of the transistor Q3, and the other end of the capacitor C7 is connected to the base of the transistor Q4.

[0034] In the present application embodiment, Figure 1 As shown, the voltage feedback control circuit includes a diode D3 and a diode D4; one end of the diode D3 is connected to the output end of the amplifier U1A, and the other end of the diode D3 is connected to the resistor R12; one end of the diode D4 is connected to the base of the transistor Q4, and the other end of the diode D4 is connected to the capacitor C7.

[0035] In the present application embodiment, Figure 1 As shown, the voltage feedback control circuit includes a resistor R9; one end of the resistor R9 is connected to the third end of the voltage doubler rectifier circuit, and the other end of the resistor R9 is connected to the reverse input end of the amplifier U1A.

[0036] Exemplarily, the voltage feedback control circuit also includes resistors R8 and R10, one end of resistor R8 is connected between capacitor C3 and resistor R2, and the other end of resistor R8 is connected to resistor R9; one end of resistor R10 is connected to resistor R9, and a constant voltage is applied to the other end of resistor R10.

[0037] Exemplarily, the output voltage is sampled by resistors R6, R8 and R10 and connected to the inverting input terminal of the amplifier UA1. A reference voltage source V-Control is provided externally. The amplifier UA1 compares the error value between the sampled signal of the output voltage and the reference voltage through a pole-zero compensation network, and converts the differential voltage signal between the two into an output current, thereby controlling the working state of the Royer resonant circuit by controlling the base current of the transistor Q3. Specifically, if the output voltage sampled by the resistors R6, R8 and R10 is greater than the reference voltage source V-Control, the transistor Q3 is controlled to output the output current. The primary voltage of the transformer UI of the Royer resonant circuit is controlled to decrease by controlling the base current of the transistor Q3, so that the secondary voltage of the transformer U1 is reduced, thereby reducing the output voltage after passing through the voltage doubler rectifier circuit, and achieving the purpose of stabilizing the output voltage; if the output voltage sampled by the resistors R6, R8 and R10 is less than the reference voltage source V-Control, the primary voltage of the transformer UI of the Royer resonant circuit is controlled to increase by controlling the base current of the transistor Q3, so that the secondary voltage of the transformer U1 is increased, thereby increasing the output voltage after passing through the voltage doubler rectifier circuit, thereby maintaining the stability of the output voltage.

[0038] In the present application embodiment, Figure 1 As shown, the voltage doubler rectifier circuit includes a diode D1, a diode D2, a capacitor C5 and a capacitor C3; one end of the diode D1 is connected to the secondary side T6 of the transformer U1, and the other end of the diode D1 is connected to one end of the diode D2; the other end of the diode D2 is connected to the filter circuit; one end of the capacitor C5 is connected to the secondary side T10 of the transformer U1, and the other end of the capacitor C5 is connected between the diode D1 and the diode D2; one end of the capacitor C3 is linked between the diode D2 and the filter circuit, and a constant voltage is applied to the other end of the capacitor C3.

[0039] Exemplarily, the voltage doubler rectifier circuit further includes a resistor R6, one end of the resistor R6 is connected between the capacitor C3 and the resistor R2, and the other end of the resistor R6 is connected to the resistor R8.

[0040] Exemplarily, the voltage outputted from the secondary coil of the transformer U1 can be rectified and multiplied by the voltage doubling rectifier circuit. Specifically, the capacitors C3 and C5 are charged and discharged by utilizing the guiding function of the diodes D1 and D2. The voltage superposition output on the two capacitors can achieve a voltage doubling effect. The diode D1 also has the technical effect of rectifying the AC voltage.

[0041] In the present application embodiment, Figure 1 As shown, the filtering circuit includes a resistor R2, a resistor R3, a capacitor C4 and a capacitor C1; one end of the resistor R2 is connected to the diode D2, and the other end of the resistor R2 is connected to the resistor R3; a constant voltage is applied to the other end of the resistor R3; one end of the capacitor C4 is connected between the resistor R2 and the resistor R3, and a constant voltage is applied to the other end of the capacitor C4; constant voltages are applied to both ends of the capacitor C1.

[0042] Exemplarily, the output voltage is further filtered out noise and interference in the circuit through a second-order RC filter circuit constructed by resistor R2, resistor R3, capacitor C1 and capacitor C4, thereby reducing the output voltage ripple.

[0043] Exemplarily, the present application does not require a power chip, but is built using only discrete devices, and the power supply is in a linear working state, so that the power supply has no switching noise. Among them, the inverter circuit uses a Royer resonant circuit design, and the circuit generates self-excited oscillation. Compared with a half-bridge or full-bridge switching power supply, the driving circuit of the present application is simpler. The power supply of the present application can meet the performance requirements of a high voltage range of 0V to +300V and a ripple of <0.001%, which greatly meets the needs of different fields for high-precision high-voltage power supplies.

[0044] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0045] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A high voltage ultra-low ripple DC-DC power supply, characterized in that: It includes Royer resonant circuit, voltage doubler rectifier circuit, voltage feedback control circuit and filter circuit; The Royer resonant circuit includes a transformer U1, a coil L1, a capacitor C2, a transistor Q1 and a transistor Q2; The primary side T1 of the transformer U1 is connected to the collector of the transistor Q1; the primary side T4 of the transformer U1 is connected to the base of the transistor Q1; The primary side T3 of the transformer U1 is connected to the collector of the transistor Q2; the primary side T5 of the transformer U1 is connected to the base of the transistor Q2; The primary side T2 of the transformer U1 is connected to one end of the coil L1, and a constant voltage is applied to the other end of the coil L1; The emitter of the transistor Q1 is connected to the emitter of the transistor Q2; The secondary side T6 of the transformer U1 and the secondary side T10 of the transformer U1 are both connected to the first end of the voltage doubler rectifier circuit; The second end of the voltage doubler rectifier circuit is connected to the filter circuit; The third terminal of the voltage doubler rectifier circuit is connected to one terminal of the voltage feedback control circuit; The other end of the voltage feedback control circuit is connected between the emitter of the transistor Q1 and the emitter of the transistor Q2.

2. The high-voltage ultra-low ripple DC-DC power supply according to claim 1, characterized in that: The Royer resonant circuit also includes a resistor R1, a resistor R4 and a resistor R5; One end of the resistor R1 is connected to the base of the transistor Q1, and the other end of the resistor R1 is connected between the coil L1 and the primary side T2 of the transformer U1; One end of the resistor R2 is connected to the base of the transistor Q2 , and the other end of the resistor R2 is connected between the coil L1 and the primary side T2 of the transformer U1 .

3. The high-voltage ultra-low ripple DC-DC power supply according to claim 1, characterized in that: The voltage feedback control circuit includes an amplifier U1A and a transistor Q3; The inverting input terminal of the amplifier U1A is connected to the third terminal of the voltage doubler rectifier circuit, and the reference voltage source V-Control is applied to the non-inverting input terminal of the amplifier U1A; The output end of the amplifier U1A is connected to the base of the transistor Q3; The collector of the transistor Q3 is connected between the emitter of the transistor Q1 and the emitter of the transistor Q2; A constant voltage is applied to the emitter of the transistor Q3.

4. The high-voltage ultra-low ripple DC-DC power supply according to claim 3, characterized in that: The voltage feedback control circuit includes a capacitor C6, a resistor R7 and a resistor R11; One end of the capacitor C6 is connected to the output end of the amplifier U1A, the other end of the capacitor C6 is connected to one end of the resistor R7, and the other end of the resistor R7 is connected to the inverting input end of the amplifier U1A; One end of the resistor R11 is connected to the non-inverting input end of the amplifier U1A, and the other end of the resistor R11 is applied with a reference voltage source V-Control.

5. The high-voltage ultra-low ripple DC-DC power supply according to claim 3, characterized in that: The voltage feedback control circuit includes a transistor Q4 and a resistor R12; The collector of the transistor Q4 is connected to the output end of the amplifier U1A, the base of the transistor Q4 is connected to the emitter of the transistor Q3, and a constant voltage is applied to the emitter of the transistor Q4; One end of the resistor R12 is connected to the output end of the amplifier U1A, and a constant voltage is applied to the other end of the resistor R12.

6. The high-voltage ultra-low ripple DC-DC power supply according to claim 5, characterized in that: The voltage feedback control circuit includes a resistor R13 and a capacitor C7; One end of the resistor R13 is connected to the emitter of the transistor Q3, and a constant voltage is applied to the other end of the resistor R13; One end of the capacitor C7 is connected to the base of the transistor Q3 , and the other end of the capacitor C7 is connected to the base of the transistor Q4 .

7. The high-voltage ultra-low ripple DC-DC power supply according to claim 6, characterized in that: The voltage feedback control circuit includes a diode D3 and a diode D4; One end of the diode D3 is connected to the output end of the amplifier U1A, and the other end of the diode D3 is connected to the resistor R12; One end of the diode D4 is connected to the base of the transistor Q4 , and the other end of the diode D4 is connected to the capacitor C7 .

8. The high-voltage ultra-low ripple DC-DC power supply according to claim 3, characterized in that: The voltage feedback control circuit includes a resistor R9; One end of the resistor R9 is connected to the third end of the voltage doubler rectifier circuit, and the other end of the resistor R9 is connected to the inverting input end of the amplifier U1A.

9. The high-voltage ultra-low ripple DC-DC power supply according to claim 1, characterized in that: The voltage doubler rectifier circuit includes a diode D1, a diode D2, a capacitor C5 and a capacitor C3; One end of the diode D1 is connected to the secondary side T6 of the transformer U1, and the other end of the diode D1 is connected to one end of the diode D2; The other end of the diode D2 is connected to the filter circuit; One end of the capacitor C5 is connected to the secondary side T10 of the transformer U1, and the other end of the capacitor C5 is connected between the diode D1 and the diode D2; One end of the capacitor C3 is connected between the diode D2 and the filter circuit, and a constant voltage is applied to the other end of the capacitor C3.

10. The high-voltage ultra-low ripple DC-DC power supply according to claim 9, characterized in that: The filter circuit includes a resistor R2, a resistor R3, a capacitor C4 and a capacitor C1; One end of the resistor R2 is connected to the diode D2, and the other end of the resistor R2 is connected to the resistor R3; A constant voltage is applied to the other end of the resistor R3; One end of the capacitor C4 is connected between the resistor R2 and the resistor R3, and a constant voltage is applied to the other end of the capacitor C4; A constant voltage is applied to both ends of the capacitor C1.

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