High-voltage ultralow-ripple DC-DC power supply

Abstract

The utility model 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 the technical fields of medical imaging, high-energy physics, environmental monitoring, and national defense security, and particularly relates to a high-voltage ultra-low ripple DC-DC power supply. BACKGROUND

[0002] In recent years, in the performance of nuclear radiation reconnaissance, nuclear accident emergency and other nuclear-related diversified tasks, the energy resolution and sensitivity of the nuclear radiation detector are required to be higher and higher. The power supply voltage precision and ripple have a greater impact on the use of the energy spectrum or imaging detector.

[0003] At present, the commonly used switching power supply on the market is affected by its principle mechanism, and the power supply cannot meet the requirement of high-voltage ultra-low ripple. With the development of photoelectric conversion devices, the driving circuit of the existing power supply is relatively complex and the cost is relatively high. CONTENT OF THE INVENTION

[0004] The embodiment of the present application provides a high-voltage ultra-low ripple DC-DC power supply, which solves the problems that the commonly used switching power supply in the prior art is affected by its principle mechanism, the power supply cannot meet the requirement of high-voltage ultra-low ripple, and the driving circuit of the existing power supply is relatively complex and the cost is relatively high. The technical effect that the power supply has no switching noise, the driving circuit is simpler, and the cost is lower is achieved.

[0005] The embodiment of the utility model provides a high-voltage ultra-low ripple DC-DC power supply, including royer resonance circuit, voltage doubling rectifier circuit, voltage feedback control circuit and filter circuit, royer resonance circuit includes transformer U1, coil L1, electric capacity C2, triode Q1 and triode Q2, the anode T1 of transformer U1 is connected with the collector of triode Q1, the anode T4 of transformer U1 is connected with the base of triode Q1, the anode T3 of transformer U1 is connected with the collector of triode Q2, the anode T5 of transformer U1 is connected with the base of triode Q2, the anode T2 of transformer U1 is connected with one end of coil L1, and the other end of coil L1 applies constant voltage, the emitter of triode Q1 is connected with the emitter of triode Q2, the secondary side T6 of transformer U1 and the secondary side T10 of transformer U1 are all connected with the first end of voltage doubling rectifier circuit, the second end of voltage doubling rectifier circuit is connected with filter circuit, the third end of voltage doubling rectifier circuit is connected with one end of voltage feedback control circuit, the other end of voltage feedback control circuit is connected between the emitter of triode Q1 and the emitter of triode Q2.

[0006] In a possible implementation, the Royer resonance circuit further comprises 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.

[0007] In a possible implementation, the voltage feedback control circuit comprises an amplifier U1A and a transistor Q3; the reverse input end of the amplifier U1A is connected with the third end of the voltage doubler rectifier circuit, and the same input end of the amplifier U1A applies a reference voltage source V-Control; the output end of the amplifier U1A is connected with 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 the emitter of the transistor Q3 applies a constant voltage.

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

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

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

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

[0012] In a possible implementation, the voltage feedback control circuit comprises a resistor R9; one end of the resistor R9 is connected with the third end of the voltage doubling rectifier circuit, and the other end of the resistor R9 is connected with the reverse input end of the amplifier U1A.

[0013] In a possible implementation, the voltage doubling rectifier circuit comprises a diode D1, a diode D2, a capacitor C5 and a capacitor C3; one end of the diode D1 is connected with the secondary side T6 of the transformer U1, and the other end of the diode D1 is connected with one end of the diode D2; the other end of the diode D2 is connected with the filter circuit; one end of the capacitor C5 is connected with 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 the other end of the capacitor C3 applies a constant voltage.

[0014] In a possible implementation, the filter circuit comprises a resistor R2, a resistor R3, a capacitor C4 and a capacitor C1; one end of the resistor R2 is connected with the diode D2, and the other end of the resistor R2 is connected with the resistor R3; the other end of the resistor R3 applies a constant voltage; one end of the capacitor C4 is connected between the resistor R2 and the resistor R3, and the other end of the capacitor C4 applies a constant voltage; both ends of the capacitor C1 apply constant voltages.

[0015] The one or more technical solutions provided in the application have at least the following technical effects:

[0016] The high-voltage ultra-low-ripple DC-DC power supply comprises a Royer resonant circuit, a voltage doubling rectifier circuit, a voltage feedback control circuit and a filter circuit; the Royer resonant circuit can convert a direct-current signal into a sinusoidal alternating-current signal, the voltage doubling rectifier circuit can convert the alternating-current signal into direct current and multiply the direct current after voltage boosting by the transformer, the filter circuit can further filter out noise and interference in the circuit and reduce the output voltage ripple, and the voltage feedback control circuit can automatically adjust the voltage output by the voltage doubling rectifier circuit, thereby maintaining the stability of the output voltage.

[0017] The inverter circuit of the present application uses the design of Royer resonant circuit, so that the circuit generates self-oscillation, and 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 need a power supply chip and only uses discrete devices to build, so that the cost of the power supply can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0019] Figure 1 The circuit diagram of the high-voltage ultra-low-ripple DC-DC power supply provided in the embodiments of the present application. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0021] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and 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 particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0022] The embodiments of the present application provide a high-voltage ultra-low-ripple DC-DC power supply, such as Figure 1As shown, the circuit comprises a Royer resonance circuit, a voltage doubler rectifier 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 transistor Q1 and a transistor Q2; a primary side T1 of the transformer U1 is connected with a collector of the transistor Q1; a primary side T4 of the transformer U1 is connected with a base of the transistor Q1; a primary side T3 of the transformer U1 is connected with a collector of the transistor Q2; a primary side T5 of the transformer U1 is connected with a base of the transistor Q2; a primary side T2 of the transformer U1 is connected with one end of the coil L1, and the other end of the coil L1 is applied with a constant voltage; an emitter of the transistor Q1 is connected with an emitter of the transistor 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 doubler rectifier circuit; a second end of the voltage doubler rectifier circuit is connected with the filter circuit; a third end of the voltage doubler rectifier circuit is connected with 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, the Royer resonance circuit can convert a direct current signal into an alternating current signal of a sine wave, so that the power supply has no switching noise. Specifically, the inverter circuit of the present application uses the design of the Royer resonance circuit, so that the circuit generates self-oscillation, and 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 need a power supply chip but only uses discrete devices to build, so that the cost of the power supply can be reduced.

[0024] Exemplarily, the Royer resonance circuit of the present application can convert a direct current signal into an alternating current signal of a sine wave, the transformer can boost the alternating current signal through the voltage doubler rectifier circuit to convert the alternating current signal into a direct current and multiply, and then the filter circuit can further filter out the noise and interference in the circuit and reduce the output voltage ripple. Further, the voltage feedback control circuit can automatically adjust the voltage output by the voltage doubler rectifier circuit, so as to maintain the stability of the output voltage.

[0025] Exemplarily, since the performances of the transistor Q1 and the transistor Q2 are not completely consistent, the base current injected into the transistor Q1 and the transistor Q2 is different at the power-on moment, so that the collector current flowing through the transistor Q1 and the transistor Q2 is also different.

[0026] For example, at the moment of power-on, the emitter current of the transistor Q1 is I1 which is greater than the emitter current I2 of the transistor Q2, and the magnetic flux of the transformer U1 depends on I1. The change of the current can cause the induced electromotive force of the feedback winding, specifically, the change of the current can cause the voltage on the feedback winding of the transformer U1 to be the induced electromotive force of the upper positive and lower negative, which can cause the base potential of the transistor Q1 to increase and the collector current to increase, and the base potential of the transistor Q2 to decrease and the collector current to decrease, that is, the transistor Q1 forms positive feedback and the transistor Q2 forms negative feedback. Under the interaction of the magnetic flux and the induced electromotive force of the transformer U1, the transistor Q1 is saturated and turned on, and the transistor Q2 is cut off. When the change of the magnetic flux of the 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 the transistor Q1 decreases, thereby causing the induced electromotive force on the feedback winding of the transformer U1 to be the induced electromotive force of the lower positive and upper negative, which can cause the base potential of the transistor Q1 to decrease and the collector current to decrease, and the base potential of the transistor Q2 to increase and the collector current to increase. That is, the transistor Q2 forms positive feedback and the transistor Q1 forms negative feedback. Under the interaction of the magnetic flux and the induced electromotive force of the transformer U1, the transistor Q2 is saturated and turned on, and the transistor Q1 is cut off. The Royer resonance circuit circulates according to the above process, thereby forming oscillation in the secondary winding of the transformer U1. By setting the size of the resonance capacitor C2, the Royer resonance circuit oscillates at a specific frequency. The relationship is:

[0027]

[0028] Wherein, C is the size of the resonance capacitor C2, f is the oscillation frequency, and L is the inductance of the primary winding of the transformer U1.

[0029] In the embodiment of the application, as shown in Figure 1 The Royer resonance circuit further 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 winding 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 winding T2 of the transformer U1.

[0030] In the embodiment of the application, as shown in Figure 1As shown in the figure, the voltage feedback control circuit comprises an amplifier U1A and a transistor Q3; the reverse input end of the amplifier U1A is connected with the third end of the voltage doubler rectifier circuit, the same direction input end of the amplifier U1A applies a reference voltage source V-Control; the output end of the amplifier U1A is connected with 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; the emitter of the transistor Q3 applies a constant voltage.

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

[0032] In the embodiment of the present application, as shown in the figure, Figure 1 The voltage feedback control circuit comprises a transistor Q4 and a resistor R12; the collector of the transistor Q4 is connected with the output end of the amplifier U1A, the base of the transistor Q4 is connected with the emitter of the transistor Q3, the emitter of the transistor Q4 applies a constant voltage; one end of the resistor R12 is connected with the output end of the amplifier U1A, the other end of the resistor R12 applies a constant voltage.

[0033] In the embodiment of the present application, as shown in the figure, Figure 1 The voltage feedback control circuit comprises a resistor R13 and a capacitor C7; one end of the resistor R13 is connected with the emitter of the transistor Q3, the other end of the resistor R13 applies a constant voltage; one end of the capacitor C7 is connected with the base of the transistor Q3, the other end of the capacitor C7 is connected with the base of the transistor Q4.

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

[0035] In the embodiment of the present application, as shown in the figure, Figure 1 The voltage feedback control circuit comprises a resistor R9; one end of the resistor R9 is connected with the third end of the voltage doubler rectifier circuit, the other end of the resistor R9 is connected with the reverse input end of the amplifier U1A.

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

[0037] The output voltage is sampled through the resistor R6, the resistor R8 and the resistor R10 and connected to the inverting input end of the amplifier UA1, an external reference voltage source V-Control is provided, the amplifier UA1 compares the error value between the sampled signal of the output voltage and the reference voltage through the pole-zero compensation network, and converts the differential voltage signal of the two into an output current, so as to control the working state of the Royer resonance circuit by controlling the base current of the transistor Q3, specifically, if the output voltage sampled through the resistor R6, the resistor R8 and the resistor R10 is greater than the reference voltage source V-Control, the primary side voltage of the transformer U1 of the Royer resonance circuit is reduced by controlling the base current of the transistor Q3, so that the secondary side voltage of the transformer U1 is reduced, thereby realizing the reduction of the output voltage after the voltage doubling rectifier circuit, and realizing the purpose of stabilizing the output voltage; if the output voltage sampled through the resistor R6, the resistor R8 and the resistor R10 is less than the reference voltage source V-Control, the primary side voltage of the transformer U1 of the Royer resonance circuit is increased by controlling the base current of the transistor Q3, so that the secondary side voltage of the transformer U1 is increased, thereby realizing the increase of the output voltage after the voltage doubling rectifier circuit, and maintaining the stability of the output voltage.

[0038] In the embodiment of the application, as shown in Figure 1 The voltage doubling rectifier circuit includes a diode D1, a diode D2, a capacitor C5 and a capacitor C3; one end of the diode D1 is connected with the secondary side T6 of the transformer U1, and the other end of the diode D1 is connected with one end of the diode D2; the other end of the diode D2 is connected with the filter circuit; one end of the capacitor C5 is connected with 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 the other end of the capacitor C3 is applied with a constant voltage.

[0039] The voltage doubling 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 with the resistor R8.

[0040] Exemplarily, the voltage output by the secondary coil of the transformer U1 can be rectified and doubled by the voltage doubling rectifier circuit, specifically, the diode D1 and the diode D2 are used to charge and discharge the capacitor C3 and the capacitor C5, and the voltage output by the two capacitors can be doubled by the voltage superposition, and the diode D1 has the technical effect of rectifying the alternating voltage.

[0041] In the embodiment of the present application, as shown in Figure 1 The filter circuit includes the resistor R2, the resistor R3, the capacitor C4 and the capacitor C1; one end of the resistor R2 is connected with the diode D2, and the other end of the resistor R2 is connected with the resistor R3; the other end of the resistor R3 is applied with a constant voltage; one end of the capacitor C4 is connected between the resistor R2 and the resistor R3, and the other end of the capacitor C4 is applied with a constant voltage; the two ends of the capacitor C1 are applied with constant voltages respectively.

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

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

[0044] The various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment mainly explains the difference from other embodiments.

[0045] The above embodiments are only used to illustrate the technical solutions of the present application, and are not limited to the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions 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 by, The Royer resonance circuit, the voltage doubling rectifier circuit, the voltage feedback control circuit and the filter circuit are included. The Royer resonance 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 with the collector of the transistor Q1; the primary side T4 of the transformer U1 is connected with the base of the transistor Q1. The primary side T3 of the transformer U1 is connected with the collector of the transistor Q2; the primary side T5 of the transformer U1 is connected with the base of the transistor Q2. The primary side T2 of the transformer U1 is connected with one end of the coil L1, and the other end of the coil L1 applies a constant voltage. The emitter of the transistor Q1 is connected with 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 with the first end of the voltage doubling rectifier circuit. The second end of the voltage doubling rectifier circuit is connected with the filter circuit. The third end of the voltage doubling rectifier circuit is connected with 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.

2. The high voltage ultra-low ripple DC-DC power supply of claim 1, wherein, The Royer resonance circuit further includes a resistor R1, a resistor R4 and a resistor R5. One end of the resistor R1 is connected with 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 R4 is connected with the base of the transistor Q2, and the other end of the resistor R4 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 of claim 1, wherein, The voltage feedback control circuit includes an amplifier U1A and a transistor Q3. The reverse input end of the amplifier U1A is connected with the third end of the voltage doubling rectifier circuit, and the same input end of the amplifier U1A applies a reference voltage source V-Control. The output end of the amplifier U1A is connected with 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. The emitter of the transistor Q3 applies a constant voltage.

4. The high voltage ultra-low ripple DC-DC power supply of claim 3, wherein, The voltage feedback control circuit includes a capacitor C6, a resistor R7 and a resistor R11. One end of the capacitor C6 is connected with the output end of the amplifier U1A, and the other end of the capacitor C6 is connected with one end of the resistor R7; the other end of the resistor R7 is connected with the reverse input end of the amplifier U1A. One end of the resistor R11 is connected with the same input end of the amplifier U1A, and the other end of the resistor R11 applies the reference voltage source V-Control.

5. The high voltage ultra-low ripple DC-DC power supply of claim 3, wherein, The voltage feedback control circuit includes a transistor Q4 and a resistor R12. The collector of the transistor Q4 is connected with the output end of the amplifier U1A, the base of the transistor Q4 is connected with the emitter of the transistor Q3, and the emitter of the transistor Q4 applies a constant voltage. One end of the resistor R12 is connected with the output end of the amplifier U1A, and the other end of the resistor R12 applies a constant voltage.

6. The high voltage ultra-low ripple DC-DC power supply of claim 5, wherein, The voltage feedback control circuit comprises a resistor R13 and a capacitor C7; One end of the resistor R13 is connected to the emitter of the transistor Q3, and the other end of the resistor R13 is applied with a constant voltage; 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 of claim 6, wherein, The voltage feedback control circuit comprises a diode D3 and a diode D4; One end of the diode D3 is connected to the output 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 of claim 3, wherein, The voltage feedback control circuit comprises a resistor R9; One end of the resistor R9 is connected to the third end of the voltage doubling rectifier circuit, and the other end of the resistor R9 is connected to the inverting input of the amplifier U1A.

9. The high voltage ultra-low ripple DC-DC power supply of claim 1, wherein, The voltage doubling rectifier circuit comprises 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 the other end of the capacitor C3 is applied with a constant voltage.

10. The high voltage ultra-low ripple DC-DC power supply of claim 9, wherein, The filter circuit comprises 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; The other end of the resistor R3 is applied with a constant voltage; One end of the capacitor C4 is connected between the resistor R2 and the resistor R3, and the other end of the capacitor C4 is applied with a constant voltage; The two ends of the capacitor C1 are respectively applied with constant voltages.

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